CN107560012B - Multi-connected fresh air fan system suitable for high-temperature climate and control method thereof - Google Patents
Multi-connected fresh air fan system suitable for high-temperature climate and control method thereof Download PDFInfo
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- CN107560012B CN107560012B CN201710713096.XA CN201710713096A CN107560012B CN 107560012 B CN107560012 B CN 107560012B CN 201710713096 A CN201710713096 A CN 201710713096A CN 107560012 B CN107560012 B CN 107560012B
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Abstract
The invention discloses a multi-connected fresh air fan system suitable for high-temperature climate and a control method thereof, wherein the system comprises: the first end of each indoor unit is connected to the first end of the outdoor unit respectively; the fresh air machine is communicated to the outdoor side through an air pipe, a first evaporator of the fresh air machine is connected to the outdoor unit through a first throttling element, the first evaporator is connected with each indoor unit together to serve as a main air pipe, the main air pipe is connected to the outdoor unit through a first control valve, a second evaporator of the fresh air machine is connected to the outdoor unit, the second evaporator is connected to the main air pipe through a second throttling element, and the second evaporator is connected to the outdoor unit through a second control valve; the first temperature detection module is used for detecting the return air temperature of the fresh air fan; the control module is used for controlling the first throttling element, the second throttling element, the first control valve and the second control valve according to the return air temperature when the fresh air fan starts a refrigeration mode. Therefore, the fresh air machine and the indoor machine can be operated at the same time under the condition of high-temperature return air, and the cost is effectively saved.
Description
Technical Field
The invention relates to the technical field of air conditioners, in particular to a multi-connected fresh air fan system suitable for high-temperature climate and a control method of the multi-connected fresh air fan system suitable for high-temperature climate.
Background
In the related art, under the condition of high-temperature return air (for example, 43 to 52 ℃), the following methods are generally adopted to control the new fans in the multi-connected new fan system: firstly, the air volume of the fresh air fan is reduced, so that the evaporation temperature is reduced; secondly, the indoor side of the system is only matched with a fresh air fan, and a conventional indoor unit is not mixed, because the evaporation capacity of the fresh air fan is large, when the fresh air fan and the conventional indoor unit are matched for use, the flow of the refrigerant can seriously deviate from the fresh air fan, so that the refrigerant of the conventional indoor unit is less, and the effect is poor.
However, the related art has the problems that the comfort of users is seriously influenced, the equipment investment is increased, and the application range of the multi-connected fresh air fan system is limited.
Disclosure of Invention
The present invention is directed to solving, at least to some extent, one of the technical problems in the art described above. Therefore, an object of the present invention is to provide a multi-connected fresh air fan system suitable for high temperature climate, which can effectively balance the refrigerant flow distribution between the fresh air fan and the conventional indoor unit, and meet the comfort requirement of the user.
The invention also aims to provide a control method of the multi-connected fresh air fan system suitable for high-temperature climate.
In order to achieve the above object, an embodiment of the present invention provides a multi-connected fresh air fan system suitable for high temperature climate, including: an outdoor unit; the first end of each indoor unit is connected to the first end of the outdoor unit respectively; the fresh air machine is communicated to the outdoor side through an air pipe to use outdoor air as return air, the fresh air machine comprises a first evaporator and a second evaporator, a first end of the first evaporator is connected to a first end of the outdoor machine through a first throttling element, a second end of the first evaporator is connected with a second end of each indoor machine to serve as a main air pipe, the main air pipe is connected to a second end of the outdoor machine through a first control valve, a first end of the second evaporator is connected to a second end of the outdoor machine, a second end of the second evaporator is connected to the main air pipe through a second throttling element, and a second end of the second evaporator is connected to a first end of the outdoor machine through a second control valve; the first temperature detection module is used for detecting the return air temperature of the fresh air fan; and the control module is used for controlling the first throttling element, the second throttling element, the first control valve and the second control valve according to the return air temperature when the fresh air fan starts a refrigeration mode.
According to the multi-connected fresh air fan system suitable for high-temperature climate provided by the embodiment of the invention, the first end of each indoor unit is respectively connected to the first end of the outdoor unit, the fresh air fan is communicated to the outdoor side through the air pipe to use outdoor air as return air, the first end of the first evaporator of the fresh air fan is connected to the first end of the outdoor unit through the first throttling element, the second end of the first evaporator is connected with the second end of each indoor unit together to serve as a main air pipe, the main air pipe is connected to the second end of the outdoor unit through the first control valve, the first end of the second evaporator of the fresh air fan is connected to the second end of the outdoor unit, the second end of the second evaporator is connected to the main air pipe through the second throttling element, the second end of the second evaporator is connected to the first end of the outdoor unit through the second control valve, the return air temperature of the fresh air fan is detected through the first temperature detection module, and the control module detects the return air temperature of, The second throttling element, the first control valve and the second control valve are controlled. Therefore, the multi-connected fresh air fan system suitable for high-temperature climate can meet the evaporation requirement of different return air temperatures through the two-stage evaporator, so that the fresh air fan and the indoor unit can be operated at the same time under the condition of high-temperature return air (43-52 ℃), the refrigerant flow distribution between the fresh air fan and the conventional indoor unit is effectively balanced, the comfort requirement of users is met, the cost is effectively saved, the system is convenient to popularize and use in high-temperature climate areas such as south Asia, middle east and Africa, and the residual low-temperature liquid-gas two-phase flow refrigerant in the main gas pipe can be utilized, so that the effective utilization rate of the refrigerant of the system is further improved.
In addition, the multiple fresh air fan system suitable for high-temperature climate provided by the above embodiment of the present invention may further have the following additional technical features:
according to an embodiment of the present invention, the control module may be further configured to determine whether the return air temperature is greater than or equal to a first preset temperature, wherein when the return air temperature is less than the first preset temperature and lasts for a first preset time, the control module controls the first throttling element and the first control valve to be opened, and controls the second throttling element and the second control valve to be closed, and the fresh air machine performs a heat exchange operation through the first evaporator; when the return air temperature is greater than or equal to a first preset temperature and lasts for a first preset time, the control module controls the first throttling element and the second throttling element to be opened and controls the first control valve to be closed, and the fresh air machine performs heat exchange work simultaneously through the first evaporator and the second evaporator.
According to an embodiment of the invention, the multiple-connected fresh air fan system suitable for high-temperature climate may further include a second temperature detection module, the second temperature detection module is configured to detect an inlet temperature and an outlet temperature of the second evaporator, and the control module is further configured to obtain a superheat degree of the fresh air fan according to the inlet temperature and the outlet temperature of the second evaporator, and control the second control valve to open when the superheat degree of the fresh air fan is greater than or equal to a first preset superheat degree, and control the second control valve to close until the superheat degree of the fresh air fan is less than or equal to a second preset superheat degree and continues for a second preset time, where the second preset superheat degree is less than the first preset superheat degree.
According to an embodiment of the present invention, the first preset temperature may be 43 to 52 ℃, the first preset superheat degree may be 7 to 9 ℃, and the second preset superheat degree may be 4 to 6 ℃.
According to an embodiment of the invention, the first control valve and the second control valve may be both solenoid valves, and the first throttling element and the second throttling element may be both electronic expansion valves.
In order to achieve the above object, according to another embodiment of the present invention, a method for controlling a multi-split fresh air blower system suitable for high temperature climate is provided, the multi-split fresh air blower system includes an outdoor unit, at least one indoor unit, and a fresh air blower, wherein a first end of each indoor unit is connected to a first end of the outdoor unit, the fresh air blower is connected to an outdoor side through an air duct to supply outdoor air as return air, the fresh air blower includes a first evaporator and a second evaporator, a first end of the first evaporator is connected to a first end of the outdoor unit through a first throttling element, a second end of the first evaporator is connected to a second end of each indoor unit to serve as a main air duct, the main air duct is connected to a second end of the outdoor unit through a first control valve, and a first end of the second evaporator is connected to a second end of the outdoor unit, a second end of the second evaporator is connected to the main air pipe through a second throttling element, and a second end of the second evaporator is connected to a first end of the outdoor unit through a second control valve, the control method comprising the steps of: detecting the return air temperature of the fresh air fan; and when the fresh air machine starts a refrigeration mode, controlling the first throttling element, the second throttling element, the first control valve and the second control valve according to the return air temperature.
According to the control method of the multi-connected fresh air fan system suitable for the high-temperature climate provided by the embodiment of the invention, the first throttling element, the second throttling element, the first control valve and the second control valve are controlled according to the return air temperature when the fresh air fan starts the refrigeration mode by detecting the return air temperature of the fresh air fan. Therefore, the control method of the multi-connected fresh air fan system suitable for the high-temperature climate can meet the evaporation requirement of different return air temperatures through the two-stage evaporators, so that the fresh air fan and the indoor unit can be operated at the same time under the condition of high-temperature return air (43-52 ℃), the refrigerant flow distribution between the fresh air fan and the conventional indoor unit is effectively balanced, the comfort requirement of users is met, the cost is effectively saved, the control method is convenient to popularize and use in high-temperature climate areas such as south Asia, middle east and Africa, and the residual low-temperature liquid-gas two-phase flow refrigerant in the main air pipe can be utilized, so that the effective utilization rate of the refrigerant of the system is further improved.
In addition, the control method of the multi-connected fresh air fan system suitable for the high-temperature climate provided by the embodiment of the invention can also have the following additional technical characteristics:
according to an embodiment of the present invention, when the first evaporator and the second evaporator perform heat exchange operation simultaneously, the method may further include: detecting an inlet temperature and an outlet temperature of the second evaporator; and acquiring the superheat degree of the fresh air fan according to the inlet temperature and the outlet temperature of the second evaporator, and controlling the second control valve to be opened when the superheat degree of the fresh air fan is greater than or equal to a first preset superheat degree, and controlling the second control valve to be closed until the superheat degree of the fresh air fan is less than or equal to a second preset superheat degree and lasts for a second preset time, wherein the second preset superheat degree is less than the first preset superheat degree.
According to an embodiment of the present invention, the first preset temperature may be 43 to 52 ℃, the first preset superheat degree may be 7 to 9 ℃, and the second preset superheat degree may be 4 to 6 ℃.
According to an embodiment of the invention, the first control valve and the second control valve may be both solenoid valves, and the first throttling element and the second throttling element may be both electronic expansion valves.
Drawings
FIG. 1 is a schematic structural diagram of a multi-connected fresh air fan system suitable for high-temperature climate according to an embodiment of the present invention;
FIG. 2 is a block schematic diagram of a control module of a multiple fresh air system for high temperature climates according to one embodiment of the invention;
FIG. 3 is a flow chart of a control method of a multi-connected fresh air fan system suitable for high temperature climate according to an embodiment of the present invention;
FIG. 4 is a flow chart of a control method of a multi-connected fresh air machine system suitable for high temperature climate according to an embodiment of the present invention;
fig. 5 is a flowchart of a control method of a multi-connected fresh air fan system suitable for high-temperature climate according to another embodiment of the present invention.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are illustrative and intended to be illustrative of the invention and are not to be construed as limiting the invention.
The following describes a multi-connected fresh air fan system suitable for high-temperature climate and a control method of the multi-connected fresh air fan system suitable for high-temperature climate according to an embodiment of the present invention with reference to the drawings.
Fig. 1 is a schematic structural diagram of a multiple-connected fresh air fan system suitable for high-temperature climate according to an embodiment of the present invention. As shown in fig. 1-2, the multi-connected fresh air fan system suitable for high temperature climate according to the embodiment of the present invention includes: the outdoor unit 10, at least one indoor unit 20, a fresh air fan 30, a first temperature detection module 40 and a control module 50.
Wherein, a first end of each indoor unit of the at least one indoor unit 20 is connected to a first end of the outdoor unit 10; the fresh air blower 30 is communicated to the outside of the room through an air duct to use the outside air as return air, the fresh air blower 30 includes a first evaporator 31 and a second evaporator 32, a first end of the first evaporator 31 is connected to a first end of the outdoor unit 10 through a first throttling element EXV1, a second end of the first evaporator 31 is connected to a second end of each indoor unit to serve as a main air duct 60, the main air duct 60 is connected to a second end of the outdoor unit 10 through a first control valve SV1, a first end of the second evaporator 32 is connected to a second end of the outdoor unit 10, a second end of the second evaporator 32 is connected to the main air duct 60 through a second throttling element EXV2, and a second end of the second evaporator 32 is connected to the first end of the outdoor unit 10 through a second control valve SV 2; the first temperature detecting module 40 is used for detecting the return air temperature T0 of the fresh air blower 30.
The control module 50 is respectively connected to the first temperature detection module 40, the first throttling element EXV1, the second throttling element EXV2, the first control valve SV1 and the second control valve SV2, and the control module 50 is configured to control the first throttling element EXV1, the second throttling element EXV2, the first control valve SV1 and the second control valve SV2 according to the return air temperature T0 when the new air blower 30 is turned on in the cooling mode.
Specifically, the fresh air fan 30 may be connected to the outdoor side through an air duct to introduce outdoor fresh air as return air, the first temperature detection module 40 may be disposed at a position of a return air inlet of the fresh air fan 30 and configured to detect a return air temperature T0 of the fresh air fan 30, the first temperature detection module 40 sends the detected return air temperature T0 to the control module 50, and the control module 50 receives the return air temperature T0 and controls the first throttling element EXV1, the second throttling element EXV2, the first control valve SV1, and the second control valve SV2 according to the return air temperature T0 when the fresh air fan 30 is in the cooling mode.
According to an embodiment of the present invention, the control module 50 is further configured to determine whether the return air temperature T0 is greater than or equal to a first preset temperature T1, wherein when the return air temperature T0 is less than the first preset temperature T1 and lasts for a first preset time T1, the control module 50 controls the first throttling element EXV1 and the first control valve SV1 to be opened, and controls the second throttling element EXV2 and the second control valve SV2 to be closed, and the new air blower 30 performs a heat exchange operation through the first evaporator 31; when the return air temperature T0 is greater than or equal to the first preset temperature T1 and lasts for the first preset time T1, the control module 50 controls the first throttling element EXV1 and the second throttling element EXV2 to be opened, and controls the first control valve SV1 to be closed, so that the new fan 30 performs heat exchange work through the first evaporator 31 and the second evaporator 32 at the same time.
Specifically, when the fresh air machine 30 is in the cooling mode, the control module 50 receives the return air temperature T0 and determines whether the return air temperature T0 is greater than or equal to a first preset temperature T1, if the return air temperature T0 is less than the first preset temperature T1, the control module 50 determines whether the duration of the return air temperature T0 less than the first preset temperature T1 reaches a first preset time T1, if the return air temperature T0 is less than the first preset temperature T1 and continues for the first preset time T1, the control module 50 controls the first throttling element EXV1 and the first control valve SV1 to be opened and controls the second throttling element EXV2 and the second control valve SV2 to be closed, and the fresh air machine 30 performs heat exchange operation through the first evaporator 31, at this time, as shown in fig. 1, the liquid refrigerant flows out from the outdoor machine 70, a portion of the liquid refrigerant flows into the at least one indoor machine 20, and the liquid refrigerant flows out through the first air pipe 61 and then returns to the first outdoor machine 1 through the first total air pipe 1, the other part of the liquid refrigerant flows into the first evaporator 31 through the opened first throttling element EXV1, the liquid refrigerant is evaporated in the first evaporator 31 and then returns to the outdoor unit 10 through the second air pipe 62, the main air pipe 60 and the opened first control valve SV1 in sequence, in this case, the refrigerant does not flow through the second evaporator 32 of the fresh air fan 30, and the fresh air fan 30 performs heat exchange only through the first evaporator 31.
If the return air temperature T0 is greater than or equal to the first preset temperature T1, the control module 50 determines whether the duration of the return air temperature T0 is greater than or equal to the first preset temperature T1 reaches the first preset time T1, if the return air temperature T0 is greater than or equal to the first preset temperature T1 and lasts for the first preset time T1, the control module 50 controls the first throttling element EXV1 and the second throttling element EXV2 to be opened and controls the first control valve SV1 to be closed, the new air blower 30 performs heat exchange work simultaneously through the first evaporator 31 and the second evaporator 32, at this time, as shown in fig. 1, the liquid refrigerant flows out from the liquid pipe 70 of the outdoor unit 10, a part of the liquid refrigerant flows into the at least one indoor unit 20, another part of the liquid refrigerant flows into the first evaporator 31, the liquid refrigerant flows out of two phases after being evaporated through the at least one indoor unit 20 and the first evaporator 31, and the liquid and gas two phases flow into the second evaporator 32 through the main air pipe 60 and the opened second throttling element EXV2, the liquid-gas two-phase refrigerant is evaporated by the second evaporator 32 and then flows back to the outdoor unit 10. In this case, the new fan 30 exchanges heat simultaneously through the first evaporator 31 and the second evaporator 32, and the second evaporator 32 does not occupy the liquid refrigerant flowing out of the outdoor unit 10, and further does not compete for the refrigerant flow of the at least one indoor unit 20, so that the refrigeration effect of the at least one indoor unit 20 is ensured, and the second evaporator 32 utilizes the liquid-gas two-phase refrigerant in the main gas pipe 60, thereby further improving the effective utilization rate of the system refrigerant.
That is, when the new air blower 30 is in the cooling mode, the control module 50 controls the first throttling element EXV1, the second throttling element EXV2, the first control valve SV1 and the second control valve SV2 according to the relationship between the return air temperature T0 and the first preset temperature T1, so that the new air blower 30 can exchange heat through one evaporator or through two evaporators, for example, when the return air temperature T0 is lower than the first preset temperature T1 at normal temperature, the new air blower 30 only exchanges heat through the first evaporator 31, and when the return air temperature T0 is higher than or equal to the first preset temperature T1 at high temperature, the new air blower 30 exchanges heat through the first evaporator 31 and the second evaporator 32.
Therefore, the multi-connected fresh air fan system suitable for the high-temperature climate can be suitable for the T3 working condition high-temperature climate (the climate with the temperature of more than 43 ℃), the two-stage evaporator can meet the evaporation requirement under different return air temperatures, the fresh air fan and the indoor unit can be operated at the same time under the condition of high-temperature return air (43 ℃ -52 ℃), the refrigerant flow distribution between the fresh air fan and the conventional indoor unit is effectively balanced, the comfort requirement of a user is met, the multi-connected fresh air fan system is convenient to popularize and use in high-temperature climate areas such as south Asia, middle east and Africa, the residual low-temperature liquid-gas two-phase flow refrigerant in a main gas pipe can be utilized, and the effective utilization rate of the refrigerant of the.
According to an embodiment of the present invention, the multi-connected fresh air fan system suitable for high temperature climate further comprises a second temperature detection module 80, the second temperature detection module 80 may comprise a first temperature sensor 51 and a second temperature sensor 52, wherein, the first temperature sensor 51 is used for detecting the inlet temperature T2A of the second evaporator 32, the second temperature sensor 52 is used for detecting the outlet temperature T2B of the second evaporator 32, the control module 50 is further used for obtaining the superheat SH of the fresh air blower 30 according to the inlet temperature T2A and the outlet temperature T2B of the second evaporator 32, and when the superheat SH of the fresh air fan 30 is larger than or equal to a first preset superheat T1, controlling a second control valve SV2 to be opened until the superheat SH of the fresh air fan 30 is smaller than or equal to a second preset superheat T2 and lasts for a second preset time T2, the second control valve SV2 is controlled to close, wherein the second preset superheat T2 is smaller than the first preset superheat T1.
It should be noted that the first temperature sensor 51 and the second temperature sensor 52 may be respectively disposed at the inlet and the outlet of the second evaporator 32, and are respectively configured to detect the inlet temperature T2A and the outlet temperature T2B of the second evaporator 32.
Specifically, the second temperature detecting module 80 sends the detected inlet temperature T2A and outlet temperature T2B to the control module 50, the control module 50 receives the inlet temperature T2A and outlet temperature T2B, and obtains a superheat SH of the fresh air blower 30 according to the inlet temperature T2A and outlet temperature T2B of the second evaporator 32, for example, a difference between the outlet temperature T2B and the inlet temperature T2A is used as the superheat SH, that is, SH is equal to T2B-T2A, then the control module 50 determines whether the superheat SH is equal to or greater than a first preset superheat T1, and if the superheat SH of the fresh air blower 30 is equal to or greater than the first preset superheat T1, the control module 50 controls the second control SV2 to be opened until the superheat SH of the fresh air blower 30 is equal to or less than a second preset superheat T2 and continues for a second preset time T2, and the control module 50 controls the second control SV2 to be closed.
That is, when the second evaporator 32 of the new fan 30 is overheated, that is, the superheat SH is greater than or equal to the first preset superheat T1, the control module 50 may control the second control valve SV2 to open, so that the liquid refrigerant flowing out of the outdoor unit 10 also flows through the second evaporator 32 in addition to the first evaporator 31 and the at least one indoor unit 20, that is, the liquid refrigerant flows into the at least one indoor unit 20, the first evaporator 31, and the second evaporator 32 through the liquid pipe 70, respectively, and the superheat SH of the second evaporator 32 may be reduced due to the low temperature of the liquid refrigerant, and when the superheat SH of the second evaporator 32 of the new fan 30 is lower than the second preset superheat T2 and continues for the second preset time T2, the second control valve SV2 is closed to restore the second evaporator 32 to the state of only obtaining the refrigerant from the main air pipe 60.
According to an embodiment of the present invention, the first preset temperature T0 may be 43-52 ℃, the first preset superheat T1 may be 7-9 ℃, and the second preset superheat T2 may be 4-6 ℃. Specifically, the first preset temperature T0 may be 43 ℃, the first preset superheat T1 may be 8 ℃, and the second preset superheat T2 may be 5 ℃.
According to an embodiment of the present invention, the second preset time t2 may be 1 minute.
According to an embodiment of the invention, the first control valve SV1 and the second control valve SV2 are both solenoid valves, and the first throttle element EXV1 and the second throttle element EXV2 are both electronic expansion valves.
In summary, according to the multi-split type fresh air fan system suitable for high temperature climate provided by the embodiment of the present invention, the first end of each indoor unit is connected to the first end of the outdoor unit, the fresh air fan is connected to the outdoor side through the air duct to use the outdoor air as the return air, the first end of the first evaporator is connected to the first end of the outdoor unit through the first throttling element, the second end of the first evaporator is connected to the second end of each indoor unit together to serve as the main air duct, the main air duct is connected to the second end of the outdoor unit through the first control valve, the first end of the second evaporator is connected to the second end of the outdoor unit, the second end of the second evaporator is connected to the main air duct through the second throttling element, the second end of the second evaporator is connected to the first end of the outdoor unit through the second control valve, the return air temperature of the fresh air fan is detected by the first temperature detecting module, and the control module detects the first throttling element according to the, The second throttling element, the first control valve and the second control valve are controlled. Therefore, the multi-connected fresh air fan system suitable for high-temperature climate can meet the evaporation requirement of different return air temperatures through the two-stage evaporator, so that the fresh air fan and the indoor unit can be operated at the same time under the condition of high-temperature return air (43-52 ℃), the refrigerant flow distribution between the fresh air fan and the conventional indoor unit is effectively balanced, the comfort requirement of users is met, the cost is effectively saved, the system is convenient to popularize and use in high-temperature climate areas such as south Asia, middle east and Africa, and the residual low-temperature liquid-gas two-phase flow refrigerant in the main gas pipe can be utilized, so that the effective utilization rate of the refrigerant of the system is further improved.
Fig. 3 is a flowchart of a control method of a multi-connected fresh air fan system suitable for high-temperature climate according to an embodiment of the present invention. Wherein, as shown in fig. 1, the multi-connected fresh air machine system suitable for high temperature climate comprises an outdoor machine, at least one indoor machine and a fresh air machine, wherein, the first end of each indoor machine is respectively connected with the first end of the outdoor machine, the fresh air machine is communicated to the outdoor side through an air pipe, the outdoor air is used as return air, the fresh air machine comprises a first evaporator and a second evaporator, the first end of the first evaporator is connected to the first end of the outdoor unit through a first throttling element, the second end of the first evaporator is connected with the second end of each indoor unit together to serve as a main air pipe, the main air pipe is connected to the second end of the outdoor unit through a first control valve, the first end of the second evaporator is connected to the second end of the outdoor unit, the second end of the second evaporator is connected to the main air pipe through a second throttling element, and the second end of the second evaporator is connected to the first end of the outdoor unit through a second control valve.
As shown in fig. 3, the control method of the multi-connected fresh air fan system suitable for high-temperature climate according to the embodiment of the present invention includes the following steps:
s1: the return air temperature T0 of the fresh air machine is detected.
S2: when the fresh air fan starts the cooling mode, the first throttling element, the second throttling element, the first control valve and the second control valve are controlled according to the return air temperature T0.
Particularly, new fan accessible tuber pipe intercommunication outdoor side to introduce outdoor fresh air as the return air, first temperature detection module can set up in the return air inlet position of new fan for detect the return air temperature T0 of new fan, open the refrigeration mode according to return air temperature T0 when new fan and control first throttling element, second throttling element, first control valve and second control valve.
According to an embodiment of the present invention, as shown in fig. 4, controlling the first throttling element, the second throttling element, the first control valve and the second control valve according to the return air temperature T0 includes:
s101: it is determined whether the return air temperature T0 is equal to or greater than a first preset temperature.
S102: when the return air temperature T0 is lower than a first preset temperature and lasts for a first preset time T, the first throttling element and the first control valve are controlled to be opened, the second throttling element and the second control valve are controlled to be closed, and the new fan performs heat exchange work through the first evaporator.
S103: when the return air temperature T0 is greater than or equal to a first preset temperature and lasts for a first preset time T, the first throttling element and the second throttling element are controlled to be opened, the first control valve is controlled to be closed, and the new fan performs heat exchange work through the first evaporator and the second evaporator simultaneously.
Specifically, when the fresh air machine is in the cooling mode, it is determined whether the return air temperature T0 is greater than or equal to a first preset temperature T1, if the return air temperature T0 is less than the first preset temperature T1, it is determined whether the duration of the return air temperature T0 being less than the first preset temperature T1 reaches a first preset time T1, if the return air temperature T0 being less than the first preset temperature T1 and lasting for the first preset time T1, the first throttling element EXV1 and the first control valve SV1 are controlled to be opened, the second throttling element and the second control valve are controlled to be closed, the fresh air machine performs heat exchange operation through the first evaporator, and at this time, as shown in fig. 1, liquid refrigerant flows out from the outdoor machine liquid pipe, a part of the liquid refrigerant flows into at least one indoor machine, the liquid refrigerant after being evaporated in at least one indoor machine flows out through the first air pipe and returns to the outdoor machine through the main air pipe and the opened first control valve, and the other part of the liquid refrigerant flows into the first evaporator through the opened first throttling element, the liquid refrigerant is evaporated in the first evaporator and then sequentially flows through the second air pipe, the main air pipe and the opened first control valve to return to the outdoor unit, under the condition, the refrigerant does not flow through the second evaporator of the fresh air fan, and the fresh air fan only exchanges heat through the first evaporator.
If the return air temperature T0 is greater than or equal to the first preset temperature T1, it is determined whether the duration of the return air temperature T0 being greater than or equal to the first preset temperature T1 reaches the first preset time T1, if the return air temperature T0 is greater than or equal to the first preset temperature T1 for the first preset time T1, the first throttling element and the second throttling element are controlled to be opened, the first control valve is controlled to be closed, the new fan performs heat exchange work through the first evaporator and the second evaporator at the same time, at the moment, as shown in fig. 1, the liquid refrigerant flows out from the liquid pipe of the outdoor unit, a part of the liquid refrigerant flows into at least one indoor unit, another part of the liquid refrigerant flows into the first evaporator, the liquid refrigerant is evaporated by the at least one indoor unit and the first evaporator and then flows out of the liquid-gas two-phase refrigerant, the liquid-gas two-phase refrigerant flows into the second evaporator through the main pipe and the opened second throttling element, and the liquid-gas two-phase refrigerant flows back to the outdoor unit after being evaporated by the second evaporator. Under this condition, new fan carries out the heat transfer simultaneously through first evaporimeter and second evaporimeter, and the second evaporimeter does not occupy the liquid refrigerant that the off-premises station flows out, and then can not compete for the refrigerant flow of at least one indoor set, consequently, the refrigeration effect of at least one indoor set obtains guaranteeing, and the second evaporimeter has utilized the two-phase refrigerant of liquid gas in the total trachea moreover, has further improved the effective utilization of system refrigerant.
That is, when the fresh air fan is in the cooling mode, the first throttling element EXV1, the second throttling element EXV2, the first control valve SV1 and the second control valve SV2 are controlled according to the relationship between the return air temperature T0 and the first pre-temperature T1, so that the fresh air fan can exchange heat through one evaporator or two evaporators, for example, when the return air temperature T0 is lower than the first pre-temperature T1 under normal temperature conditions, the fresh air fan only exchanges heat through the first evaporator, and when the return air temperature T0 is higher than the first pre-temperature T1 under high temperature conditions, the fresh air fan exchanges heat through the first evaporator and the second evaporator.
According to an embodiment of the present invention, as shown in fig. 5, when the first evaporator and the second evaporator perform heat exchange operation simultaneously, the method further includes:
s201: the inlet temperature T2A and the outlet temperature T2B of the second evaporator are detected.
S202: and acquiring the superheat degree of the fresh air fan according to the inlet temperature T2A and the outlet temperature T2B of the second evaporator, controlling the second control valve to be opened when the superheat degree of the fresh air fan is greater than or equal to a first preset superheat degree, and controlling the second control valve to be closed until the superheat degree of the fresh air fan is less than or equal to a second preset superheat degree and lasts for a second preset time, wherein the second preset superheat degree is less than the first preset superheat degree.
It should be noted that the inlet temperature and the outlet temperature of the second evaporator may be detected by the second temperature detecting module, wherein the second temperature detecting module may include the second temperature detecting module 80 may include the first temperature sensor 51 and the second temperature sensor 52, wherein the first temperature sensor 51 is configured to detect the inlet temperature T2A of the second evaporator 32, the second temperature sensor 52 is configured to detect the outlet temperature T2B of the second evaporator 32, the superheat SH of the new fan is obtained according to the inlet temperature T2A and the outlet temperature T2B of the second evaporator 32, for example, a difference between the outlet temperature T2B and the inlet temperature T2A is taken as the superheat SH, that is, SH T2B-T2A, and then it is determined whether the superheat SH is greater than or equal to the first preset superheat T1, if the SH of the new fan is greater than or equal to the first preset superheat T1, the second control valve SV is controlled to be opened until the SH of the new fan is less than or equal to the second preset superheat T1 and 2, the second control valve SV2 is controlled to close.
That is, when the second evaporator of the fresh air machine is overheated, that is, the superheat SH is greater than or equal to the first preset superheat T1, the second control valve SV2 may be controlled to open, the liquid refrigerant flowing out of the outdoor unit flows through the second evaporator, that is, the liquid refrigerant passes through the liquid pipe 70, and flows into the at least one indoor unit 20, the first evaporator 31, and the second evaporator 32, respectively, in addition to the first evaporator and the at least one indoor unit, and the superheat SH of the second evaporator may be reduced due to the low temperature of the liquid refrigerant, and when the superheat SH of the second evaporator of the fresh air machine is lower than the second preset superheat T2 and continues for the second preset time T2, the second control valve SV2 may be closed to restore the second evaporator to the state of only obtaining the refrigerant from the main air pipe.
According to one embodiment of the invention the first predetermined temperature is 43-52 ℃, the first predetermined degree of superheat is 7-9 ℃ and the second predetermined degree of superheat is 4-6 ℃.
According to an embodiment of the present invention, the first preset temperature T0 may be 43-52 ℃, the first preset superheat T1 may be 7-9 ℃, and the second preset superheat T2 may be 4-6 ℃. Specifically, the first preset temperature T0 may be 43 ℃, the first preset superheat T1 may be 8 ℃, and the second preset superheat T2 may be 5 ℃.
According to an embodiment of the present invention, the second preset time t2 may be 1 minute.
According to an embodiment of the present invention, the first control valve and the second control valve may be both solenoid valves, and the first throttling element and the second throttling element may be both electronic expansion valves.
In summary, according to the control method of the multi-split fresh air fan system suitable for the high-temperature climate provided by the embodiment of the invention, by detecting the return air temperature of the fresh air fan, when the fresh air fan starts the cooling mode, the first throttling element, the second throttling element, the first control valve and the second control valve are controlled according to the return air temperature. Therefore, the control method of the multi-connected fresh air fan system suitable for the high-temperature climate can meet the evaporation requirement of different return air temperatures through the two-stage evaporators, so that the fresh air fan and the indoor unit can be operated at the same time under the condition of high-temperature return air (43-52 ℃), the refrigerant flow distribution between the fresh air fan and the conventional indoor unit is effectively balanced, the comfort requirement of users is met, the cost is effectively saved, the control method is convenient to popularize and use in high-temperature climate areas such as south Asia, middle east and Africa, and the residual low-temperature liquid-gas two-phase flow refrigerant in the main air pipe can be utilized, so that the effective utilization rate of the refrigerant of the system is further improved.
In the description of the present invention, it is to be understood that the terms "central," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," "circumferential," and the like are used in the orientations and positional relationships indicated in the drawings for convenience in describing the invention and to simplify the description, and are not intended to indicate or imply that the referenced device or element must have a particular orientation, be constructed and operated in a particular orientation, and are not to be considered limiting of the invention.
Furthermore, 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 specifically defined otherwise.
In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
In the present invention, unless otherwise expressly stated or limited, the first feature "on" or "under" the second feature may be directly contacting the first and second features or indirectly contacting the first and second features through an intermediate. Also, a first feature "on," "over," and "above" a second feature may be directly or diagonally above the second feature, or may simply indicate that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the first feature, or may simply mean that the first feature is at a lesser elevation than the second feature.
In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction.
Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and that variations, modifications, substitutions and alterations can be made to the above embodiments by those of ordinary skill in the art within the scope of the present invention.
Claims (10)
1. The utility model provides a new fan system of multiple-connected type suitable for high temperature climate which characterized in that includes:
an outdoor unit;
the first end of each indoor unit is connected to the first end of the outdoor unit respectively;
the fresh air machine is communicated to the outdoor side through an air pipe to use outdoor air as return air, the fresh air machine comprises a first evaporator and a second evaporator, a first end of the first evaporator is connected to a first end of the outdoor machine through a first throttling element, a second end of the first evaporator is connected with a second end of each indoor machine to serve as a main air pipe, the main air pipe is connected to a second end of the outdoor machine through a first control valve, a first end of the second evaporator is connected to a second end of the outdoor machine, a second end of the second evaporator is connected to the main air pipe through a second throttling element, and a second end of the second evaporator is connected to a first end of the outdoor machine through a second control valve;
the first temperature detection module is used for detecting the return air temperature of the fresh air fan;
the control module is used for controlling the first throttling element, the second throttling element, the first control valve and the second control valve according to the return air temperature when the fresh air fan starts a refrigeration mode;
the control module is also used for judging whether the return air temperature is more than or equal to a first preset temperature or not, wherein when the return air temperature is more than or equal to the first preset temperature and lasts for a first preset time, the control module controls the first throttling element and the second throttling element to be opened and controls the first control valve to be closed, and the fresh air machine passes through the first evaporator and the second evaporator to simultaneously carry out heat exchange work.
2. The multi-connected fresh air fan system suitable for high-temperature climate according to claim 1,
when the return air temperature is lower than a first preset temperature and lasts for a first preset time, the control module controls the first throttling element and the first control valve to be opened and controls the second throttling element and the second control valve to be closed, and the fresh air fan performs heat exchange work through the first evaporator.
3. The multi-connected fresh air fan system suitable for the high-temperature climate as claimed in claim 2, further comprising a second temperature detection module, wherein the second temperature detection module is configured to detect an inlet temperature and an outlet temperature of the second evaporator, the control module is further configured to obtain a superheat degree of the fresh air fan according to the inlet temperature and the outlet temperature of the second evaporator, and control the second control valve to open when the superheat degree of the fresh air fan is greater than or equal to a first preset superheat degree, and control the second control valve to close until the superheat degree of the fresh air fan is less than or equal to a second preset superheat degree and lasts for a second preset time, wherein the second preset superheat degree is less than the first preset superheat degree.
4. The multi-connected fresh air fan system suitable for the high-temperature climate according to claim 3, wherein the first preset temperature is 43-52 ℃, the first preset superheat degree is 7-9 ℃, and the second preset superheat degree is 4-6 ℃.
5. The multi-connected fresh air fan system suitable for the high-temperature climate according to any one of claims 1-4, wherein the first control valve and the second control valve are both solenoid valves, and the first throttling element and the second throttling element are both electronic expansion valves.
6. A control method of a multi-connected fresh air fan system suitable for high-temperature climate is characterized in that the multi-connected fresh air fan system comprises an outdoor unit, at least one indoor unit and fresh air fans, wherein a first end of each indoor unit is respectively connected to a first end of the outdoor unit, the fresh air fans are communicated to the outdoor side through air pipes so as to take outdoor air as return air, each fresh air fan comprises a first evaporator and a second evaporator, a first end of the first evaporator is connected to a first end of the outdoor unit through a first throttling element, a second end of the first evaporator and a second end of each indoor unit are connected together to form a main air pipe, the main air pipe is connected to a second end of the outdoor unit through a first control valve, a first end of the second evaporator is connected to a second end of the outdoor unit, and a second end of the second evaporator is connected to the main air pipe through a second throttling element, and a second end of the second evaporator is connected to a first end of the outdoor unit through a second control valve, the control method comprising the steps of:
detecting the return air temperature of the fresh air fan;
when the fresh air machine starts a refrigeration mode, controlling the first throttling element, the second throttling element, the first control valve and the second control valve according to the return air temperature;
wherein controlling the first throttling element, the second throttling element, the first control valve, and the second control valve according to the return air temperature comprises:
judging whether the return air temperature is greater than or equal to a first preset temperature or not; when the return air temperature is greater than or equal to a first preset temperature and lasts for a first preset time, the first throttling element and the second throttling element are controlled to be opened, the first control valve is controlled to be closed, and the fresh air machine simultaneously performs heat exchange work through the first evaporator and the second evaporator.
7. The control method of the multi-connected fresh air fan system suitable for the high-temperature climate according to claim 6,
when the return air temperature is lower than a first preset temperature and lasts for a first preset time, the first throttling element and the first control valve are controlled to be opened, the second throttling element and the second control valve are controlled to be closed, and the fresh air fan performs heat exchange work through the first evaporator.
8. The method for controlling the multi-connected fresh air fan system applicable to the high-temperature climate according to claim 7, further comprising, when the first evaporator and the second evaporator perform heat exchange operation simultaneously:
detecting an inlet temperature and an outlet temperature of the second evaporator;
and acquiring the superheat degree of the fresh air fan according to the inlet temperature and the outlet temperature of the second evaporator, and controlling the second control valve to be opened when the superheat degree of the fresh air fan is greater than or equal to a first preset superheat degree, and controlling the second control valve to be closed until the superheat degree of the fresh air fan is less than or equal to a second preset superheat degree and lasts for a second preset time, wherein the second preset superheat degree is less than the first preset superheat degree.
9. The control method of the multi-connected fresh air fan system suitable for the high-temperature climate according to claim 8, wherein the first preset temperature is 43-52 ℃, the first preset superheat degree is 7-9 ℃, and the second preset superheat degree is 4-6 ℃.
10. The method for controlling the multi-connected fresh air fan system suitable for the high-temperature climate according to any one of claims 6-9, wherein the first control valve and the second control valve are both solenoid valves, and the first throttling element and the second throttling element are both electronic expansion valves.
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| JP4249541B2 (en) * | 2003-05-14 | 2009-04-02 | 株式会社山武 | Building ventilation system |
| CN1323267C (en) * | 2004-12-31 | 2007-06-27 | 广东科龙电器股份有限公司 | Multistage evaporation type air conditioner |
| CN201059692Y (en) * | 2007-06-21 | 2008-05-14 | 苏宇贵 | Water source heat pump fresh air conditioner |
| CN101487639B (en) * | 2009-02-11 | 2011-03-16 | 西安建筑科技大学 | Air-cooling double-evaporator heat pump unit |
| CN101876469B (en) * | 2009-11-26 | 2012-06-27 | 佛山市浩特普尔人工环境设备有限公司 | Heat pump coupling contraflow type liquid-desiccant central ventilation system and control method thereof |
| CN202126039U (en) * | 2011-06-27 | 2012-01-25 | 上海成信建业节能科技有限公司 | Air-conditioning system for independently controlling temperature and humidity |
| CN203443023U (en) * | 2013-09-05 | 2014-02-19 | 珠海格力电器股份有限公司 | Control system of multi-split air conditioner |
| CN205783434U (en) * | 2016-05-27 | 2016-12-07 | 四川博世德节能环保工程有限公司 | A kind of combined air conditioner VMC (Ventilation Mechanical Control System) |
| CN105890070B (en) * | 2016-06-01 | 2018-09-28 | 江苏慧居建筑科技有限公司 | The dehumidification fresh air group and air conditioning method of more condensers and double back wind bypass |
| CN106369769A (en) * | 2016-10-27 | 2017-02-01 | 上海朗绿建筑科技股份有限公司 | Novel independent temperature and humidity control method and system |
| CN106705298B (en) * | 2016-12-23 | 2022-07-01 | 南通华信中央空调有限公司 | Multi-connected fresh air conditioning unit with exhaust heat pump heat recovery function and heat exchange method |
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