CN102645057A - Oil returning method during heating of multi-split air-conditioning unit - Google Patents
Oil returning method during heating of multi-split air-conditioning unit Download PDFInfo
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- CN102645057A CN102645057A CN2012100948039A CN201210094803A CN102645057A CN 102645057 A CN102645057 A CN 102645057A CN 2012100948039 A CN2012100948039 A CN 2012100948039A CN 201210094803 A CN201210094803 A CN 201210094803A CN 102645057 A CN102645057 A CN 102645057A
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- air conditioning
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- 238000004378 air conditioning Methods 0.000 title claims abstract description 32
- 238000000034 method Methods 0.000 title claims abstract description 27
- 238000010438 heat treatment Methods 0.000 title claims abstract description 24
- 239000003921 oil Substances 0.000 claims description 82
- 239000010721 machine oil Substances 0.000 claims description 10
- 239000007788 liquid Substances 0.000 abstract description 13
- 230000000694 effects Effects 0.000 abstract description 4
- 239000003507 refrigerant Substances 0.000 description 25
- 239000010687 lubricating oil Substances 0.000 description 11
- 239000002826 coolant Substances 0.000 description 7
- 238000005057 refrigeration Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000008020 evaporation Effects 0.000 description 1
- 238000001704 evaporation Methods 0.000 description 1
- 230000009897 systematic effect Effects 0.000 description 1
- 238000010792 warming Methods 0.000 description 1
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- Compression-Type Refrigeration Machines With Reversible Cycles (AREA)
Abstract
The invention discloses an oil returning method during heating of a multi-split air-conditioning unit. The oil returning method comprises the following steps of: a, carrying out normal heating on the multi-split air-conditioning unit; b, adjusting an operation frequency of a compressor (1) to an oil returning frequency, adjusting aperture of an external unit electronic expansion valve (2) to an external unit oil returning aperture, adjusting apertures of internal unit electronic expansion valves (3) of all the indoor units to an internal unit oil returning aperture, and returning oil for 2.5-3.5 minutes by maintaining the oil returning frequency of the compressor (1), the external unit oil returning aperture of the external unit electronic expansion valve (2) and the internal unit oil returning aperture of the internal unit electronic expansion valves (3); c, adjusting the operation frequency of the compressor (1) to a normal frequency, and operating for 15-25 seconds; and d, adjusting the aperture of the external unit electronic expansion valve (2) to the normal aperture, and adjusting the apertures of all the internal unit electronic expansion valves (3) to the normal aperture. The oil returning method disclosed by the invention can guarantee good oil returning effect without liquid impact on the compressor, and indoor heating can be continuously carried out in an oil returning process.
Description
Technical field
The present invention relates to VRF Air Conditioning System, specifically is the oil return method of a kind of VRF Air Conditioning System when heating.
Background technology
The VRF Air Conditioning System of prior art comprises an off-premises station, a plurality of indoor set parallel with one another and two refrigerant circulation house stewards that connect each indoor set and off-premises station.
Each off-premises station comprises compressor, oil eliminator, four-way change-over valve, outdoor heat exchanger (being evaporimeter during heating mode), outer organic electronic expansion valve, reservoir and gas-liquid separator.Compressor outlet is communicated with an end of oil eliminator; The other end of oil eliminator is communicated with first valve port of four-way change-over valve; The 3rd valve port of four-way change-over valve is communicated with a refrigerant pipe among two refrigerants circulation house stewards; Another root refrigerant pipe among two refrigerants circulation house steward is communicated with an end of outer organic electronic expansion valve, and the other end of outer organic electronic expansion valve is communicated with an end of outdoor heat exchanger, and the other end of outdoor heat exchanger is communicated with second valve port of four-way change-over valve; The 4th valve port of four-way change-over valve is communicated with an end of gas-liquid separator, and the other end of gas-liquid separator is communicated with the suction port of compressor.In addition, each off-premises station also comprises the outdoor fan that impels outdoor heat exchanger and outdoor environment heat exchange.During heating mode, first valve port of four-way change-over valve is communicated with the 3rd valve port, and second valve port is communicated with the 4th valve port, and promptly refrigerant is along compressor, indoor heat exchanger, outdoor heat exchanger, this route circulation of compressor; And during refrigeration mode, the four-way change-over valve switching-over makes the valve port of winning be communicated with second valve port, and the 3rd valve port is communicated with the 4th valve port, and promptly refrigerant circulates along compressor, outdoor heat exchanger, indoor heat exchanger, this route of compressor.
Organic electronic expansion valve and indoor heat exchanger (being condenser during heating mode) in each indoor set comprises; One end of indoor heat exchanger is communicated with an end of interior organic electronic expansion valve; One among the other end of interior organic electronic expansion valve and the two refrigerants circulation house stewards is communicated with, and another root refrigerant pipe that the other end of indoor heat exchanger and two refrigerants circulate among the house stewards is communicated with.In addition, each indoor set also comprises the indoor fan that impels indoor heat exchanger and indoor environment heat exchange.
Above-mentioned outer organic electronic expansion valve, interior organic electronic expansion valve and compressor all are electrically connected with the air-conditioning master controller.
During compressor operating; The lubricating oil that compressor is shielded can leave compressor entering pipeline along with the gaseous refrigerant of HTHP; Though the oil eliminator of compressor outlet can slow down this situation, the long-play compressor still has more lubricating oil and leaves compressor; Get into pipeline, this just needs VRF Air Conditioning System to carry out oil return.
Lubricating oil is when high pressure, and is high more with the refrigerant mixability, and during low pressure; Lubricating oil is prone to separate with refrigerant; And when heating mode, refrigerant can be by outer organic electronic expansion valve throttling step-down, like this; The refrigerant pressure that flows through outer organic electronic expansion valve reduces, and lubricating oil separates with refrigerant and is deposited in a large number in the pipeline and outdoor heat exchanger of outer organic electronic expansion valve back segment.
Traditional oil return method during heating mode is with the four-way change-over valve switching-over, to make VRF Air Conditioning System switch to refrigeration mode operation, close chamber's inner blower simultaneously from heating mode.The principle of tradition oil return method is, make the refrigerant of HTHP flow through outdoor heat exchanger and near pipeline, make that being deposited on this regional lubricating oil is in a large number mixed by the refrigerant of HTHP and take away, and finally get back in the compressor through indoor heat exchanger.Traditional oil return method exists a drawback that is difficult to overcome, and is exactly the aperture problem of indoor electric expansion valve: if its aperture is too small, will make lubricating oil separate with cold-producing medium, unfavorable oil return to cold-producing medium throttling step-down; If aperture is excessive, because indoor heat exchanger heat exchange hardly, like this, a large amount of liquid refrigerants again can the liquid hammer compressor.And, in the oil return process,, can't continue indoor heating owing to adopt refrigeration mode, the user can't utilize warming by air conditioner.
Summary of the invention
The technical problem that the present invention will solve is, a kind of oil return method can guarantee that the effective VRF Air Conditioning System of again can the liquid hammer compressor and in the oil return process, can proceed indoor heating of oil return heats the time is provided.
Technical solution of the present invention is, the oil return method when providing a kind of VRF Air Conditioning System to heat, and it may further comprise the steps:
A, VRF Air Conditioning System be normal operation under heating mode;
B, when needing oil return; Four-way change-over valve does not commutate; The running frequency of compressor is adjusted into the oil return frequency, and the aperture with outer organic electronic expansion valve is adjusted into outer machine oil return aperture simultaneously, and machine oil return aperture in simultaneously the aperture of the interior organic electronic expansion valve of whole indoor sets being adjusted into; And VRF Air Conditioning System keeps the interior machine oil return aperture oil return of the oil return frequency of compressor, the outer machine oil return aperture of outer organic electronic expansion valve, interior organic electronic expansion valve, and the oil return time is 2.5 ~ 3.5 minutes;
C, the running frequency of compressor is adjusted back normal frequency, and under normal frequency, move 15 ~ 25 seconds;
D, the aperture the when aperture of outer organic electronic expansion valve is adjusted into normal operation, simultaneously will be all in the aperture of the organic electronic expansion valves aperture when being adjusted into normal operation, the oil return process finishes.
The principle of this oil return method is: continue to heat circulation; The gaseous coolant of HTHP continues heat exchange in indoor heat exchanger, but the aperture of interior organic electronic expansion valve and outer organic electronic expansion valve all increased, like this; No longer to the coolant throttle step-down; Former accumulating in a large number in outdoor heat exchanger and near the pipeline must can be got back to compressor along with the high pressure refrigerant by lubricating oil, i.e. oil return is satisfactory for result, and; Because outdoor heat exchanger also continues heat exchange evaporation liquid refrigerants, can prevent too much liquid refrigerants liquid hammer compressor like this.
Adopt above method, the oil return method when VRF Air Conditioning System of the present invention heats compared with prior art has the following advantages:
1, indoor heat exchanger still continues heat exchange, and like this, this VRF Air Conditioning System heats indoor the continuation, can not reduce room temperature, guarantees client's result of use; 2, because organic electronic expansion valves and outer organic electronic expansion valve opening increase in all, no longer to the coolant throttle step-down, the high pressure refrigerant can with take back compressor after lubricating oil fully mixes; Be that oil return is effective; Moreover the interior organic electronic expansion valve of idle indoor set had also been opened before oil return began, like this; HTHP refrigerant gaseous coolant can from the indoor heat exchanger of the indoor set of these not heat exchange directly through and enter into outdoor heat exchanger with gaseous state; The refrigerant that this part temperature is higher, pressure is bigger is better to the mixed effect of lubricating oil, can more lubricating oil be taken back compressor, i.e. oil return better effects if; 3, outdoor heat exchanger also still continues heat exchange, and liquid coolant is evaporated to gas coolant, like this, just avoids a large amount of liquid coolant liquid hammer compressors.
As improvement, the oil return frequency described in the step b is meant 45 ~ 55Hz, through evidence; Compressor is satisfactory for result with this frequency oil return of 45 ~ 55Hz, surpasses 55 Hz operation, and system occurs the high voltage fault warning easily and shuts down; Be lower than 45 Hz operation, can't guarantee system's oil return fully.
As improving, the preferred 50Hz of oil return frequency proves through repetition test again, compressor 50Hz oil return, and effect is the most desirable, high voltage fault promptly can not occur, can guarantee oil return fast smoothly again.
As a further improvement, as described in step b outside the machine back to the oil opening refers to steps 470 to 480, after tests proved the external drive electronic expansion valve opening of 470 to 480 steps, back to the oil better.
As a further improvement, as described in step b outside the machine back to the oil opening means 480 steps, after repeated tests proved the external drive electronic expansion valve opening of 480 steps, the oil return the best results.
As a further improvement, as described in step b inside the machine back to the oil opening is 470 to 480 steps, tests have shown that, inside the machine electronic expansion valve opening degree of 470 to 480 steps, better oil return.
As a further improvement, as described in step b the oil inside the machine back to the step 480 refers to the degree of opening, after repeated tests show that within the machine electronic expansion valve opening degree of the step 480, the best oil return.
As further improving again, the oil return time described in the step b is 3 minutes, proves through repetition test, and this oil return time is the most desirable, surpasses 3 minutes, and high voltage fault appears in system easily, causes reporting to the police shutting down, and is less than 3 minutes, can't guarantee complete oil return.
As further improving again again; Compressor described in the step c moves 20 seconds under normal frequency, like this, each interior organic electronic expansion valve just recovers normal running frequency after 20 seconds; Arranged, the isostasy of indoor heat exchanger of each indoor set that can make parallel connection 20 seconds buffer time.
Description of drawings
Fig. 1 is the systematic schematic diagram of the oil return method of embodiment of the present invention VRF Air Conditioning System when heating.
Shown in the figure 1, compressor, 2, outer organic electronic expansion valve, 3, interior organic electronic expansion valve.
The specific embodiment
Below in conjunction with accompanying drawing and specific embodiment the present invention is described further.
As shown in Figure 1, the oil return method when VRF Air Conditioning System of the present invention heats, it may further comprise the steps:
a, multi air conditioning unit in the heating mode normal operation, this time, outside the machine electronic expansion valve 2 throttle device for the system, the opening is generally 120 steps, while being open mechanism of heat within the machine indoor unit 3, electronic expansion valve opening degree is generally about 350 steps, not the heating power of the indoor unit is not within the local electronic expansion valve 3 opening degree is 0, and the frequency of the compressor 1 according to the load of the indoor unit number to be adjusted, more than the number of indoor boot, the operating frequency of the compressor a large, generally more than 50Hz, the small number of indoor boot, the operating frequency of the compressor a small, generally less than 50Hz.
b, the need to return to the oil, not the four-way reversing valve, remain in the heating mode; the operation frequency of the compressor 1 to adjust the frequency for the return oil, oil return frequency of 45 ~ 55Hz, preferably 50Hz; while outside the machine electronic expansion valve 2 opening is adjusted to the external drive back to the oil opening, outside the machine back to the oil opening is 470 to 480 steps, preferably 480 steps, is about two outdoor unit electronic expansion valve opening degree increased from about 120 to 480 steps Step.And simultaneously all the indoor unit 3 within the machine opening of the electronic expansion valve is adjusted to the degree of opening of the indoor unit back to the oil, the oil inside the machine back to the opening 470 to step 480, step 480 is preferably, within the machine about a powered electronic expansion valve 3 opening increased from 350 to 480 steps walk around or within the machine will not boot electronic expansion valve opening degree 3 increased from 0 to 480 steps.VRF Air Conditioning System keeps the interior machine oil return aperture oil return of the oil return frequency of compressor 1, the outer machine oil return aperture of outer organic electronic expansion valve 2, interior organic electronic expansion valve 3, and the oil return time is 2.5 ~ 3.5 minutes, preferred 3 minutes.
C, the running frequency of compressor 1 is adjusted back normal frequency, the running frequency that is about to compressor 1 back into the normal running frequency before the row oil return pattern, and is moved 15 ~ 25 seconds, preferred 20 seconds from the oil return frequency adjustment of 50Hz under normal frequency.
d, the outdoor unit electronic expansion valve 2 opening is adjusted to the normal operation of the opening, coming outside the machine electronic expansion valve opening degree adjusting two steps back to 120 or so.Within the machine while the entire opening of the electronic expansion valve 3 is adjusted to the opening degree of the runtime, will open the indoor unit of the original within the machine electronic expansion valve 3 opening degree adjustment step 350 back to right and left or the original unopened indoor unit within the machine's electronic expansion valve opening is adjusted three steps back to 0.At this moment, the oil return process finishes, and this VRF Air Conditioning System returns to normal heating mode operation.
Claims (9)
1. the oil return method a when VRF Air Conditioning System heats, it is characterized in that: it may further comprise the steps:
A, VRF Air Conditioning System be normal operation under heating mode;
B, when needing oil return; Four-way change-over valve does not commutate; The running frequency of compressor (1) is adjusted into the oil return frequency; Aperture with outer organic electronic expansion valve (2) is adjusted into outer machine oil return aperture simultaneously; And machine oil return aperture in simultaneously the aperture of the interior organic electronic expansion valve (3) of whole indoor sets being adjusted into, and VRF Air Conditioning System keeps the oil return frequency of compressor (1), the outer machine oil return aperture of outer organic electronic expansion valve (2), the interior machine oil return aperture oil return of interior organic electronic expansion valve (3), and the oil return time is 2.5 ~ 3.5 minutes;
C, the running frequency of compressor (1) is adjusted back normal frequency, and under normal frequency, move 15 ~ 25 seconds;
D, the aperture the when aperture of outer organic electronic expansion valve (2) is adjusted into normal operation, simultaneously will be all in the aperture of organic electronic expansion valves (3) aperture when being adjusted into normal operation, the oil return process finishes.
2. the oil return method when VRF Air Conditioning System according to claim 1 heats is characterized in that: the oil return frequency described in the step b is meant 45 ~ 55Hz.
3. the oil return method when VRF Air Conditioning System according to claim 2 heats is characterized in that: the preferred 50Hz of oil return frequency.
As claimed in claim 1, wherein the multi-type air conditioning unit heating the oil return, characterized in that: step b outside the machine described in the opening degree of the oil return means 470 to step 480.
5 according to claim 4, wherein the multi-type air conditioning unit heating the oil return, characterized in that: step b, said outer drive 480 is preferably an oil return opening step.
As claimed in claim 1, wherein the multi-type air conditioning units heating the oil return, characterized in that: in said step b inside the machine back to the oil opening is 470 to 480 steps.
As claimed in claim 6, wherein the multi-type air conditioning units heating the oil return, characterized in that: in said step b inside the machine back to the oil opening 480 is preferably step.
8. the oil return method when VRF Air Conditioning System according to claim 1 heats is characterized in that: the oil return time described in the step b is 3 minutes.
9. the oil return method when VRF Air Conditioning System according to claim 1 heats is characterized in that: the compressor described in the step c (1) moves 20 seconds under normal frequency.
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| Application Number | Priority Date | Filing Date | Title |
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| CN2012100948039A CN102645057A (en) | 2012-03-31 | 2012-03-31 | Oil returning method during heating of multi-split air-conditioning unit |
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| Application Number | Priority Date | Filing Date | Title |
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| CN2012100948039A CN102645057A (en) | 2012-03-31 | 2012-03-31 | Oil returning method during heating of multi-split air-conditioning unit |
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| CN102645057A true CN102645057A (en) | 2012-08-22 |
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| CN2012100948039A Pending CN102645057A (en) | 2012-03-31 | 2012-03-31 | Oil returning method during heating of multi-split air-conditioning unit |
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Application publication date: 20120822 |