CN118049781A - Control method of air conditioning system and air conditioning system - Google Patents
Control method of air conditioning system and air conditioning system Download PDFInfo
- Publication number
- CN118049781A CN118049781A CN202211461615.5A CN202211461615A CN118049781A CN 118049781 A CN118049781 A CN 118049781A CN 202211461615 A CN202211461615 A CN 202211461615A CN 118049781 A CN118049781 A CN 118049781A
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- liquid
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- refrigerant
- liquid separator
- air conditioning
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- 238000004378 air conditioning Methods 0.000 title claims abstract description 64
- 238000000034 method Methods 0.000 title claims abstract description 36
- 239000007788 liquid Substances 0.000 claims abstract description 248
- 239000003507 refrigerant Substances 0.000 claims abstract description 134
- 238000007599 discharging Methods 0.000 claims abstract description 22
- 230000006835 compression Effects 0.000 claims description 13
- 238000007906 compression Methods 0.000 claims description 13
- 239000003921 oil Substances 0.000 description 17
- 238000012423 maintenance Methods 0.000 description 8
- 238000001704 evaporation Methods 0.000 description 6
- 230000008020 evaporation Effects 0.000 description 6
- 230000002035 prolonged effect Effects 0.000 description 3
- RWRIWBAIICGTTQ-UHFFFAOYSA-N difluoromethane Chemical compound FCF RWRIWBAIICGTTQ-UHFFFAOYSA-N 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000011084 recovery Methods 0.000 description 2
- 238000006467 substitution reaction Methods 0.000 description 2
- CBENFWSGALASAD-UHFFFAOYSA-N Ozone Chemical compound [O-][O+]=O CBENFWSGALASAD-UHFFFAOYSA-N 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000014509 gene expression Effects 0.000 description 1
- 150000008282 halocarbons Chemical class 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 239000010687 lubricating oil Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Classifications
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B30/00—Energy efficient heating, ventilation or air conditioning [HVAC]
- Y02B30/70—Efficient control or regulation technologies, e.g. for control of refrigerant flow, motor or heating
Landscapes
- Compression-Type Refrigeration Machines With Reversible Cycles (AREA)
Abstract
The invention relates to the technical field of air conditioners, in particular to a control method of an air conditioning system and the air conditioning system, and aims to solve the problem that after the air conditioning system is repaired, liquid refrigerant in a gas-liquid separator can enter a compressor in a large amount when the air conditioning system is started, so that the compressor liquid is compressed and damaged. For this purpose, the control method of the air conditioning system of the invention, the air conditioning system also includes the liquid level sensor, the liquid level sensor is used for detecting the liquid level in the gas-liquid separator; the control method comprises the following steps: s10: the air conditioning system is started, the actual height H1 of the liquid level in the gas-liquid separator is obtained, and the preset height H2 of the liquid level in the gas-liquid separator is obtained; s20: comparing the actual height H1 with a preset height H2, and controlling the air conditioner to enter a liquid discharging mode or a normal starting mode of the gas-liquid separator according to the comparison result. According to the control method of the air conditioning system, the liquid refrigerant in the gas-liquid separator is discharged, so that the liquid impact of the compressor is avoided.
Description
Technical Field
The invention relates to the technical field of air conditioners, and particularly provides a control method of an air conditioning system and the air conditioning system.
Background
Difluoromethane is a halogenated hydrocarbon (chemical formula: CH 2F2), abbreviated as R32. Is gas at normal temperature, is colorless transparent liquid under self pressure, is easy to dissolve in oil and difficult to dissolve in water, and is a refrigerant with zero ozone depletion potential. The method is mainly applied to the multi-split system. However, the R32 refrigerant has the greatest defects of inflammability and explosiveness, belongs to a high-risk refrigerant, and is easy to generate danger if leakage occurs in the using process.
The key point of the prior art is that after leakage, the R32 sensor detects the concentration, then the alarm is stopped, after-sales personnel maintenance is waited, and during the period of waiting for the after-sales personnel maintenance, in order to avoid the R32 refrigerant to be always in a leakage state, the refrigerant is recovered into the outdoor heat exchanger, so that the refrigerant in a pipeline is reduced, and the leakage of the refrigerant is controlled.
However, when the refrigerant in the air conditioning system is generally more, the refrigerant in the air conditioning system is considered to be recovered into the outdoor heat exchanger and the gas-liquid separator, and a large amount of liquid refrigerant exists in the gas-liquid separator, so that after the system is repaired, the liquid refrigerant in the gas-liquid separator enters the compressor in a large amount when the compressor is started, and the compressor liquid is compressed and damaged. Therefore, how to avoid the refrigerant in the gas-liquid separator from entering the compressor in a large amount when the compressor is started is a problem to be solved in the art.
Disclosure of Invention
The invention aims to solve the technical problems, namely, the problems that the prior air conditioning system is repaired in a mode of storing liquid refrigerant by adopting a gas-liquid separator, and the liquid refrigerant in the gas-liquid separator can enter the compressor in a large amount when the compressor is started, so that the liquid of the compressor is compressed and damaged are solved.
According to a first aspect of the present invention, there is disclosed a control method of an air conditioning system, the air conditioning system further comprising a liquid level sensor for detecting a liquid level in the gas-liquid separator; the control method comprises the following steps: s10: the air conditioning system is started, the actual height H1 of the liquid level in the gas-liquid separator is obtained, and the preset height H2 of the liquid level in the gas-liquid separator is obtained; s20: and comparing the actual height H1 with a preset height H2, and controlling the air conditioner to enter a liquid discharging mode or a normal starting mode of the gas-liquid separator according to the comparison result.
Further, the step S20 further includes the steps of: s21: if H1 is more than or equal to H2, controlling the air conditioning system to enter a liquid discharging mode of the gas-liquid separator, and discharging liquid refrigerant in the gas-liquid separator; if H1 is less than H2, the air conditioning system enters a normal starting mode.
Further, the step S20 further includes the steps of: s22: after entering a liquid discharging mode of the gas-liquid separator, acquiring the actual height H1 of the liquid level in the gas-liquid separator again every time of a preset time T; s23: comparing the actual height H1 with a preset height H2, and continuously discharging the liquid refrigerant in the gas-liquid separator if the H1 is more than or equal to H2; and if H1 is less than H2, exiting the liquid discharge mode of the gas-liquid separator.
Further, the air conditioning system has a refrigerant compression cycle, the refrigerant compression cycle includes a first control valve, a second control valve, an outdoor heat exchanger, an indoor heat exchanger and a refrigerant circulation pipeline, the first control valve is disposed on the refrigerant pipeline between the indoor heat exchanger and the outdoor heat exchanger, a first end of the refrigerant circulation pipeline is communicated on the refrigerant pipeline between the outdoor heat exchanger and the first control valve, a second end of the refrigerant circulation pipeline is connected on the gas-liquid separator, the second control valve is disposed on the refrigerant circulation pipeline, and the step S21 further includes the following steps: s211: after entering a liquid discharging mode of the gas-liquid separator, a first control valve and a second control valve are opened, and liquid refrigerant in the gas-liquid separator is discharged into an indoor side pipeline of the refrigerant compression cycle.
Further, the refrigerant compression cycle further includes a third control valve disposed between the first control valve and the indoor heat exchanger, and the step S21 further includes the steps of: s212: and opening the third control valve to control the liquid refrigerant discharged from the gas-liquid separator to enter the indoor heat exchanger.
Further, the step S21 further includes the steps of: s213: after the liquid refrigerant discharged by the gas-liquid separator enters the indoor heat exchanger, starting an indoor fan corresponding to the indoor heat exchanger.
Further, the step S22 specifically includes: and if H1 is less than H2, closing the second control valve.
Further, the gas-liquid separator comprises a refrigerant outlet pipe communicated with the air suction port of the compressor, an oil return hole communicated with the compressor is arranged on the refrigerant outlet pipe, and the height of the oil return hole is H3, and H2 is less than or equal to H3.
Further, the gas-liquid separator further comprises a liquid storage tank, a liquid inlet and outlet hole is formed in the liquid storage tank, the liquid inlet and outlet hole is communicated with the refrigerant circulation pipeline, and the height of the liquid inlet and outlet hole is not greater than the preset height H2.
According to another aspect of the invention, an air conditioning system is also disclosed, and the air conditioning system is controlled by adopting the control method.
According to the control method of the air conditioning system, after the maintenance of the air conditioning system is finished, the air conditioning system is started, the liquid level of the liquid refrigerant in the gas-liquid separator is detected, if the liquid level in the gas-liquid separator is too high, a large amount of liquid refrigerant is sucked after the compressor is started, so that the phenomenon of liquid impact occurs, therefore, when the refrigerant in the gas-liquid separator is too much, the liquid refrigerant in the gas-liquid separator is firstly discharged in a liquid distribution mode of the gas-liquid separator, the liquid impact of the compressor is avoided, the compressor is protected, and the service life of the compressor is prolonged.
Drawings
Preferred embodiments of the present invention are described below with reference to the accompanying drawings, in which:
fig. 1 is a schematic structural view of an air conditioning system according to a first embodiment of the present invention;
fig. 2 is a flowchart of a control method of an air conditioning system according to a first embodiment of the present invention;
fig. 3 is a specific flowchart of step S20 in the control method of the air conditioning system according to the first embodiment of the present invention;
fig. 4 is a schematic view of a gas-liquid separator of an air conditioning system according to a first embodiment of the present invention;
fig. 5 is a schematic diagram of a gas-liquid separator of an air conditioning system according to a second embodiment of the present invention;
list of reference numerals:
10. Refrigerant compression cycle; 11. a gas-liquid separator; 111. a refrigerant outlet pipe; 112. an oil return hole; 113. a liquid storage tank; 114. an air inlet pipe; 12. a first control valve; 13. a second control valve; 14. an outdoor heat exchanger; 15. an indoor heat exchanger; 151. a third control valve; 16. a refrigerant circulation line; 17. a fifth control valve; 18. a compressor; 19. a fourth control valve; 20. a liquid level sensor.
Detailed Description
The invention is further illustrated by the following examples, but the scope of the invention is not limited to the description.
In order that those skilled in the art will better understand the present invention, a technical solution in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in which it is apparent that the described embodiments are only some embodiments of the present invention, not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the present invention without making any inventive effort, shall fall within the scope of the present invention.
It should be noted that the terms "first," "second," and the like in the description and the claims of the present invention and the above figures are used for distinguishing between similar objects and not necessarily for describing a particular sequential or chronological order. It is to be understood that the terms so used are interchangeable under appropriate circumstances such that the embodiments of the invention described herein are, for example, capable of operation in other environments. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.
It should be noted that, in the description of the present invention, terms such as "upper," "lower," "left," "right," "inner," "outer," and the like indicate directions or positional relationships based on the directions or positional relationships shown in the drawings, which are merely for convenience of description, but do not indicate or imply that the apparatus or element must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
Furthermore, it should be noted that, in the description of the present invention, unless explicitly specified and limited otherwise, the terms "mounted," "configured," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be directly connected, can be indirectly connected through an intermediate medium, and can also be communicated with the inside of two elements. The specific meaning of the above terms in the present invention can be understood by those skilled in the art according to the specific circumstances.
After the refrigerant R32 leaks, the concentration is detected by the R32 sensor, then the alarm is stopped, after-sales personnel maintenance is waited, and in order to avoid the R32 refrigerant being always in a leakage state during the after-sales personnel maintenance waiting period, the refrigerant is recovered into the outdoor heat exchanger 14, so that the refrigerant in a pipeline is reduced, and the leakage of the refrigerant is further controlled.
However, when the air conditioning system has more refrigerant, too much refrigerant enters the outdoor heat exchanger 14 during recovery, and when the external temperature is too high, part of the liquid refrigerant in the outdoor heat exchanger 14 is easily vaporized, so that the internal pressure of the outdoor heat exchanger 14 increases, thereby causing damage to the outdoor heat exchanger 14. In order to avoid the damage of the outdoor heat exchanger 14, it is considered to recover part of the refrigerant of the air conditioning system into the gas-liquid separator 11, thereby sharing the refrigerant storage pressure of the outdoor heat exchanger 14.
After the system is maintained and needs to be started, because a large amount of liquid refrigerant exists in the gas-liquid separator 11, the liquid refrigerant in the gas-liquid separator 11 can enter the compressor 18 in a large amount during the starting of the compressor 18, so that the compressor liquid is compressed and damaged. Therefore, how to avoid the refrigerant in the gas-liquid separator 11 from entering the compressor 18 in a large amount when the compressor 18 is started is a problem to be solved in the art.
In order to solve the above problems, as shown in fig. 1, an air conditioning system is disclosed, which includes a refrigerant compression cycle 10 and a liquid level sensor 20, the refrigerant compression cycle 10 including a gas-liquid separator 11, a first control valve 12, a second control valve 13, a third control valve 151, a fourth control valve 19, a fifth control valve 17, an outdoor heat exchanger 14, an indoor heat exchanger 15, a refrigerant circulation line 16, a compressor 18, and a four-way valve.
The exhaust port of the compressor 18 is communicated with the first end of the four-way valve, the second end of the four-way valve is communicated with the second end of the outdoor heat exchanger 14, the third end of the four-way valve is communicated with the air inlet pipe 114 of the gas-liquid separator 11, and the fourth end of the four-way valve is communicated with the first end of the indoor unit heat exchanger.
As shown in fig. 1, a first end of the first control valve 12 is communicated with a second end of the outdoor heat exchanger 14 through a refrigerant pipe, a second end of the first control valve 12 is communicated with a second end of the indoor heat exchanger 15, that is, the first control valve 12 is disposed on the refrigerant pipe between the indoor heat exchanger 15 and the outdoor heat exchanger 14, and the fourth control valve 19 is disposed between the outdoor heat exchanger 14 and the first control valve 12; the first end of the refrigerant circulation line 16 is connected to the refrigerant line between the fourth control valve 19 and the first control valve 12 of the outdoor heat exchanger 14, the second end of the refrigerant circulation line 16 is connected to the gas-liquid separator 11 and is connected to the inside of the gas-liquid separator 11, and the second control valve 13 is provided on the refrigerant circulation line 16. A liquid level sensor 20 is provided in the gas-liquid separator 11 for detecting the liquid level in the gas-liquid separator 11.
During cooling, the second control valve 13 is closed and the first control valve 12 is opened. The exhaust port of the compressor 18 communicates with the first end of the outdoor heat exchanger 14, and the intake pipe 114 of the gas-liquid separator 11 communicates with the first end of the indoor heat exchanger 15. During heating, the second control valve 13 is closed, the exhaust port of the compressor 18 is communicated with the first end of the indoor heat exchanger 15, and the first end of the outdoor heat exchanger 14 is communicated with the air inlet pipe 114 of the gas-liquid separator 11.
When the refrigerant is recovered, the first control valve 12 is closed, the refrigerant can be recovered to the outdoor heat exchanger 14, the refrigerant is prevented from flowing into the indoor side again in the recovery process, then the second control valve 13 is opened, the liquid refrigerant in the outdoor heat exchanger 14 can enter the gas-liquid separator 11 along the refrigerant circulation pipeline 16 under the action of pressure, after the refrigerant is recovered, the second control valve 13 and the fourth control valve 19 are closed, so that the pressure in the outdoor heat exchanger 14 can be relieved, and the damage risk of the outdoor heat exchanger 14 is reduced.
As shown in fig. 2, after the refrigerant is recovered, the air conditioning system can be maintained, and after the maintenance is completed, the control method of the air conditioning system comprises the following steps:
S10: the air conditioning system is started, the actual height H1 of the liquid level in the gas-liquid separator 11 is obtained, and the preset height H2 of the liquid level in the gas-liquid separator 11 is obtained;
S20: and comparing the actual height H1 with a preset height H2, and controlling the air conditioning system to enter a liquid discharging mode or a normal starting mode of the gas-liquid separator 11 according to the comparison result.
According to the control method of the air conditioning system, after the maintenance of the air conditioning system is completed, the air conditioning system is started, the liquid level of the liquid refrigerant in the gas-liquid separator 11 is detected, if the liquid level in the gas-liquid separator 11 is too high, a large amount of liquid refrigerant is sucked after the compressor 18 is started, so that the phenomenon of liquid impact occurs, therefore, when the refrigerant in the gas-liquid separator 11 is too much, the liquid sensor is arranged in the gas-liquid separator 11, the liquid refrigerant in the gas-liquid separator 11 is firstly discharged in a liquid distribution mode, the liquid refrigerant in the gas-liquid separator 11 is prevented from being impacted by the compressor 18, and the service life of the compressor 18 is prolonged.
As shown in fig. 3, the following steps are further included in step S20:
S21: if H1 is more than or equal to H2, controlling the air conditioning system to enter a liquid discharging mode of the gas-liquid separator 11, and discharging liquid refrigerant in the gas-liquid separator 11; if H1 is less than H2, the air conditioning system enters a normal starting mode.
When H1 is more than or equal to H2, the actual height of the liquid level in the gas-liquid separator 11 is not lower than the preset height, and at the moment, if the air conditioning system is normally started, a large amount of liquid refrigerant is sucked into the compressor 18, so that the air conditioning system is controlled to enter a liquid discharging mode of the gas-liquid separator 11, the liquid refrigerant in the gas-liquid separator 11 is discharged, the compressor 18 is prevented from being impacted, the compressor 18 is protected, and the service life of the compressor 18 is prolonged. When H1 < H2, it indicates that the actual height of the liquid level in the gas-liquid separator 11 is less than the preset height, and at this time, the air conditioning system is normally turned on, and the compressor 18 will not suck a large amount of liquid refrigerant, so that it can be normally started.
In the present embodiment, as shown in fig. 4, the gas-liquid separator 11 includes a liquid storage tank 113 and a refrigerant outlet pipe 111, one end of the refrigerant outlet pipe 111 is not communicated with the interior of the liquid storage tank 113, the other end is communicated with an air suction port of the compressor 18, an oil return hole 112 communicated with the compressor 18 is provided on the refrigerant outlet pipe 111, and the height of the oil return hole 112 is H3, and H2 is equal to or less than H3. As shown in fig. 3, in order to recover the lubricating oil in the gas-liquid separator 11, a portion of the refrigerant outlet pipe 111 located in the liquid storage tank 113 forms a U-shaped structure, the oil return hole 112 is located at the bottom of the U-shaped structure, when the liquid level in the liquid storage tank 113 is higher than H3, that is, the oil return hole 112 is immersed in the liquid storage tank 113, turning on the compressor 18 at this time necessarily causes the compressor 18 to suck a large amount of liquid refrigerant, so that the compressor 18 can be started only when the page of the liquid refrigerant is lower than the oil return hole 112, that is, the preset height H2 is smaller than the height H3 of the oil return hole 112, thereby avoiding liquid impact when the compressor 18 is started.
It should be noted that, the liquid storage tank 113 is provided with a liquid inlet and a liquid outlet, the liquid inlet and the liquid outlet are communicated with the refrigerant circulation pipeline 16, when the refrigerant is recovered by the air conditioning system, the refrigerant can flow into the liquid storage tank 113 from the near liquid inlet through the refrigerant circulation pipeline 16 for storage, and when the refrigerant liquid needs to be discharged, the refrigerant liquid can flow into the refrigerant circulation pipeline 16 through the liquid inlet and the liquid outlet for discharge. Therefore, in order to ensure that the liquid level of the refrigerant can be eventually lower than the oil return hole 112 when the refrigerant is discharged, the height of the oil inlet and outlet hole needs to be smaller than the height of the oil return hole 112, and further, the preset height H2 may be between the height H3 of the oil return hole 112 and the height of the oil inlet and outlet hole.
In the present embodiment, the liquid inlet and outlet holes are provided at the bottom of the side wall of the liquid storage tank 113, but this is not limitative, and in the second embodiment shown in fig. 5, the liquid inlet and outlet holes are provided at the bottom of the liquid storage tank 113. That is, it is possible to arrange the inlet and outlet holes at a position lower than the oil return hole 112.
The step S21 further includes the steps of:
S211: after entering the liquid discharging mode of the gas-liquid separator 11, the first control valve 12 and the second control valve 13 are opened, and the liquid refrigerant in the gas-liquid separator 11 is discharged into the indoor side pipeline of the refrigerant compression cycle 10. After the maintenance of the air conditioning system is completed, the pipeline on the indoor side is vacuumized, so that negative pressure is formed inside the pipeline on the indoor side, and after the first control valve 12 and the second control valve 13 are opened, the fourth control valve 19 is closed, and under the action of the negative pressure, the liquid refrigerant in the gas-liquid separator 11 flows to the indoor side through the refrigerant circulation pipeline 16, the second control valve 13 and the first control valve 12, so that the liquid level in the gas-liquid separator 11 is reduced.
Further, the refrigerant compression cycle 10 further includes a third control valve 151, the third control valve 151 being disposed between the first control valve 12 and the indoor heat exchanger 15 for controlling the refrigerant entering the indoor heat exchanger 15, and the step S21 further includes the steps of:
S212: the third control valve 151 is opened to control the liquid refrigerant discharged from the gas-liquid separator 11 to enter the indoor heat exchanger 15. By opening the third control valve 151, the liquid refrigerant in the gas-liquid separator 11 can enter the indoor heat exchanger 15 to exchange heat and evaporate into a gaseous refrigerant, and the liquid refrigerant can be converted into the gaseous refrigerant in advance while the liquid level of the gas-liquid separator 11 is reduced, so that the gaseous refrigerant can be quickly sucked by the compressor 18 when the compressor 18 is started normally, and the starting efficiency is improved.
Further, in order to improve the evaporation efficiency of the liquid refrigerant, the step S21 further includes the following steps:
S213: after the liquid refrigerant discharged from the gas-liquid separator 11 enters the indoor heat exchanger 15, the indoor fan corresponding to the indoor heat exchanger 15 is started. By turning on the internal fan, convection can be forced, so that the heat exchange efficiency of the indoor heat exchanger 15 is improved, and the evaporation efficiency of the liquid refrigerant is further improved. Accordingly, in order to maximize the evaporation efficiency of the liquid refrigerant, after the indoor unit fan is turned on, the opening degree of the third control valve 151 may be correspondingly increased, so that more liquid refrigerant enters the indoor heat exchanger 15, so as to improve the evaporation effect.
The step S20 further includes the steps of:
s22: after entering a liquid discharging mode of the gas-liquid separator 11, acquiring the actual height H1 of the liquid level in the gas-liquid separator 11 again every time of a preset time T;
S23: comparing the actual height H1 with a preset height H2, and continuously discharging the liquid refrigerant in the gas-liquid separator 11 if the H1 is more than or equal to H2; if H1 is less than H2, the liquid discharging mode of the gas-liquid separator 11 is exited.
After entering the liquid discharge mode of the gas-liquid separator 11, the actual height H1 of the liquid level in the gas-liquid separator 11 needs to be obtained again at intervals of a preset time T, that is, the height H1 of the liquid level in the gas-liquid separator 11 needs to be obtained at regular time, when H1 is greater than or equal to H2, the liquid refrigerant in the gas-liquid separator 11 is continuously discharged, and when H1 is less than H2, the liquid level height is reduced to the lower part of the oil return hole 112, so that the liquid discharge mode of the gas-liquid separator 11 can be exited, and the air conditioning system is normally started. Further, in step S22, the method specifically includes: if H1 < H2, the second control valve 13 is closed. By closing the second control valve 13, the refrigerant flow line 16 can be closed, thereby exiting the liquid discharge mode of the gas-liquid separator 11.
After the air conditioning system is normally started, the fourth control valve 19 and the fifth control valve 17 are opened, the compressor 18 is started, and the opening of the third control valve 151 can be correspondingly adjusted according to the target temperature by the air conditioning indoor unit, so that the refrigerant state at the outlet of the indoor heat exchanger 15 is ensured to be in a single gas state.
In this embodiment, the indoor unit may be one or a plurality of indoor units may be connected in parallel. According to different practical situations, the liquid refrigerant can only enter one indoor heat exchanger 15 for evaporation, and can also enter a plurality of indoor heat exchangers 15 for evaporation at the same time.
According to another aspect of the invention, an air conditioning system is also disclosed, and the air conditioning system is controlled by adopting the control method.
The relative arrangement of the components and steps, numerical expressions and numerical values set forth in these embodiments do not limit the scope of the present invention unless it is specifically stated otherwise. Meanwhile, it should be understood that the sizes of the respective parts shown in the drawings are not drawn in actual scale for convenience of description. Techniques, methods, and apparatus known to one of ordinary skill in the relevant art may not be discussed in detail, but should be considered part of the specification where appropriate. In all examples shown and discussed herein, any specific values should be construed as merely illustrative, and not a limitation. Thus, other examples of the exemplary embodiments may have different values. It should be noted that: like reference numerals and letters denote like items in the following figures, and thus once an item is defined in one figure, no further discussion thereof is necessary in subsequent figures.
Spatially relative terms, such as "above … …," "above … …," "upper surface on … …," "above," and the like, may be used herein for ease of description to describe one device or feature's spatial location relative to another device or feature as illustrated in the figures. It will be understood that the spatially relative terms are intended to encompass different orientations in use or operation in addition to the orientation depicted in the figures. For example, if the device in the figures is turned over, elements described as "above" or "over" other devices or structures would then be oriented "below" or "beneath" the other devices or structures. Thus, the exemplary term "above … …" may include both orientations "above … …" and "below … …". The device may also be positioned in other different ways (rotated 90 degrees or at other orientations) and the spatially relative descriptors used herein interpreted accordingly.
In the description of the present invention, it should be understood that the azimuth or positional relationships indicated by the azimuth terms such as "front, rear, upper, lower, left, right", "lateral, vertical, horizontal", and "top, bottom", etc., are generally based on the azimuth or positional relationships shown in the drawings, merely to facilitate description of the present invention and simplify the description, and these azimuth terms do not indicate and imply that the apparatus or elements referred to must have a specific azimuth or be constructed and operated in a specific azimuth, and thus should not be construed as limiting the scope of protection of the present invention; the orientation word "inner and outer" refers to inner and outer relative to the contour of the respective component itself.
Thus far, the technical solution of the present invention has been described in connection with the preferred embodiments shown in the drawings, but it is easily understood by those skilled in the art that the scope of protection of the present invention is not limited to these specific embodiments. Equivalent modifications and substitutions for related technical features may be made by those skilled in the art without departing from the principles of the present invention, and such modifications and substitutions will fall within the scope of the present invention.
Claims (10)
1. A control method of an air conditioning system, characterized in that the air conditioning system further comprises a liquid level sensor (20), the liquid level sensor (20) being used for detecting the liquid level in a gas-liquid separator (11); the control method comprises the following steps:
S10: the air conditioning system is started, the actual height H1 of the liquid level in the gas-liquid separator (11) is obtained, and the preset height H2 of the liquid level in the gas-liquid separator (11) is obtained;
S20: and comparing the actual height H1 with a preset height H2, and controlling the air conditioning system to enter a liquid discharging mode or a normal starting mode of the gas-liquid separator (11) according to the comparison result.
2. The control method according to claim 1, characterized in that in said step S20, further comprising the steps of:
S21: if H1 is more than or equal to H2, controlling the air conditioning system to enter a liquid discharging mode of the gas-liquid separator (11), and discharging liquid refrigerant in the gas-liquid separator (11); if H1 is less than H2, the air conditioning system enters a normal starting mode.
3. The control method according to claim 2, characterized in that in said step S20, further comprising the steps of:
s22: after entering a liquid discharging mode of the gas-liquid separator (11), acquiring the actual height H1 of the liquid level in the gas-liquid separator (11) again every preset time T;
s23: comparing the actual height H1 with a preset height H2, and continuously discharging the liquid refrigerant in the gas-liquid separator (11) if the H1 is more than or equal to H2; and if H1 is less than H2, exiting the liquid discharging mode of the gas-liquid separator (11).
4. A control method according to claim 3, characterized in that the air conditioning system has a refrigerant compression cycle (10), the refrigerant compression cycle (10) comprising a first control valve (12), a second control valve (13), an outdoor heat exchanger (14), an indoor heat exchanger (15) and a refrigerant circulation line (16), the first control valve (12) being arranged on the refrigerant line between the indoor heat exchanger (15) and the outdoor heat exchanger (14), a first end of the refrigerant circulation line (16) being connected on the refrigerant line between the outdoor heat exchanger (14) and the first control valve (12), a second end of the refrigerant circulation line (16) being connected on the gas-liquid separator (11), the second control valve (13) being arranged on the refrigerant circulation line (16), the step S21 further comprising the steps of:
S211: after entering a liquid discharging mode of the gas-liquid separator (11), a first control valve (12) and a second control valve (13) are opened, and liquid refrigerant in the gas-liquid separator (11) is discharged into an indoor side pipeline of the refrigerant compression cycle (10).
5. The control method according to claim 4, wherein the refrigerant compression cycle (10) further includes a third control valve (17), the third control valve (17) being disposed between the first control valve (12) and the indoor heat exchanger (15), and the step S21 further includes the steps of:
s212: and opening the third control valve (17) to control the liquid refrigerant discharged from the gas-liquid separator (11) to enter the indoor heat exchanger (15).
6. The control method according to claim 5, characterized in that in said step S21, further comprising the steps of:
S213: after the liquid refrigerant discharged by the gas-liquid separator (11) enters the indoor heat exchanger (15), an indoor fan corresponding to the indoor heat exchanger (15) is started.
7. The control method according to claim 4, characterized in that in step S22, further specifically comprising:
if H1 < H2, the second control valve (13) is closed.
8. The control method according to claim 1, wherein,
The gas-liquid separator (11) comprises a refrigerant outlet pipe (111) communicated with an air suction port of the compressor (18), an oil return hole (112) communicated with the compressor (18) is arranged on the refrigerant outlet pipe (111), and the height of the oil return hole (112) is H3, and H2 is less than or equal to H3.
9. The control method according to claim 4, wherein,
The gas-liquid separator (11) further comprises a liquid storage tank (113), a liquid inlet and outlet hole is formed in the liquid storage tank (113), the liquid inlet and outlet hole is communicated with the refrigerant circulation pipeline (16), and the height of the liquid inlet and outlet hole is not greater than the preset height H2.
10. An air conditioning system, characterized in that the air conditioning system is controlled by the control method according to any one of claims 1 to 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211461615.5A CN118049781A (en) | 2022-11-17 | 2022-11-17 | Control method of air conditioning system and air conditioning system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211461615.5A CN118049781A (en) | 2022-11-17 | 2022-11-17 | Control method of air conditioning system and air conditioning system |
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| Publication Number | Publication Date |
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| CN118049781A true CN118049781A (en) | 2024-05-17 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202211461615.5A Pending CN118049781A (en) | 2022-11-17 | 2022-11-17 | Control method of air conditioning system and air conditioning system |
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| Country | Link |
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| CN (1) | CN118049781A (en) |
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