CN102563812B - Multi-split air-conditioning system and control method thereof - Google Patents
Multi-split air-conditioning system and control method thereof Download PDFInfo
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- CN102563812B CN102563812B CN201210017448.5A CN201210017448A CN102563812B CN 102563812 B CN102563812 B CN 102563812B CN 201210017448 A CN201210017448 A CN 201210017448A CN 102563812 B CN102563812 B CN 102563812B
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Abstract
The invention provides a multi-split air-conditioning system and a control method thereof. The method comprises the following steps of: comparing the operating load with preset load of the air-conditioning system; when the operating load is less than or equal to the preset load, controlling a first rotor of a constant-speed and variable-volume dual-rotor compressor to compress a refrigerant from a low-voltage-side refrigerant pipeline, next leading the refrigerant compressed by the first rotor to be compressed by a second rotor and then discharging the refrigerant into a high-voltage-side refrigerant pipeline; and when the operating load is more than the preset load, controlling the first rotor and the second rotor together to carry out single-stage compression on the refrigerant from the low-voltage-side refrigerant pipeline, and then discharging the refrigerant into the high-voltage-side refrigerant pipeline. The multi-split air-conditioning system comprises the constant-speed and variable-volume dual-rotor compressor with the first rotor and the second rotor and a volume control four-way device, wherein the volume control four-way device is used for adjusting the dual-rotor compressor to discharge the compressed refrigerant by first volume or second volume so as to lead the load of the system to be matched with the refrigerant circulating volume of the system.
Description
Technical field
The present invention relates to a kind of control method and multi-split air conditioner of multi-split air conditioner.
Background technology
Small-sized variable-frequency multi-split air conditioner will be realized the frequency change of compressor, need to adopt powerful electronic component, electric network source is carried out to the conversion of AC-DC-AC, has so not only increased the difficulty of designing and developing of air-conditioner, and has improved manufacture and maintenance cost.For the part small area of family, use constant speed one drag two air-conditioning system, the economy of overall operation can be better.So constant speed one drag two air-conditioning system still has market at home.
Existing constant speed one drag two air-conditioning system, owing to generally all adopting the compressor of the immutable capacity of constant speed, in the situation that only having one, the stability of system is poor, and some operational factors easily exceed the range of operation of compressor.Can cause like this and reduce the compressor hidden danger in service life.Owing to occurring the phenomenon of " low load with strong power ", the in the situation that of an interior machine operation, the energy efficiency coefficient of air-conditioning system will drag air-conditioner little a lot of compared with frequency conversion one in addition.
For example, application number is that 201020627341.9 Chinese patent application (being called for short documents 1) discloses a kind of air-conditioner, comprise that variable capacity two-spool compressor, outdoor heat converter, orifice union and indoor heat converter connect into loop, also comprise cross valve and triple valve, outdoor heat exchanger and indoor heat exchanger are selectively communicated with variable capacity two-spool compressor by cross valve, two imports of triple valve connect respectively exhaust side and first air entry of variable capacity two-spool compressor, and the outlet of triple valve connects the second air entry of variable capacity two-spool compressor.Documents 1 is according to the situation of air-conditioner operation, and when high frequency, variable capacity two-spool compressor uses birotor pattern, and when low frequency, variable capacity two-spool compressor can use single rotor pattern or birotor pattern.But single rotor pattern essence is rotor of bypass in documents 1, make not participate in circulation, although the compression refrigerant amount of supply is the capacity of single rotor, whether refrigerant is carried out to two-stage compression.
Summary of the invention
For the problem existing in correlation technique, the object of the present invention is to provide a kind of control method and multi-split air conditioner of multi-split air conditioner, so that the refrigerant circulation of air-conditioning system and the load of air-conditioning system match.
For achieving the above object, the invention provides a kind of control method of multi-split air conditioner, air-conditioning system comprises that the variable-displacement of constant speed has the two-spool compressor of the first and second rotors, be connected between the low-pressure side refrigerant pipeline and high-pressure side refrigerant pipeline of air-conditioning system, described method comprises: the operating load of air-conditioning system and default load are compared; When operating load is less than or equal to default load, control the first rotor to the refrigerant compression from low-pressure side refrigerant pipeline, then make the refrigerant after the first rotor compression after the second rotor compression, just enter again high-pressure side refrigerant pipeline; When operating load is greater than default load, controls the first rotor and the refrigerant from low-pressure side refrigerant pipeline is carried out entering high-pressure side refrigerant pipeline after single stage compress together with the second rotor.
Preferably, when operating load is less than or equal to default load, the capacity that the coolant quantity that enters high-pressure side refrigerant pipeline is the first rotor; When operating load is greater than default load, the coolant quantity that enters high-pressure side refrigerant pipeline is the first rotor and bitrochanteric capacity sum.
Preferably, at multi-split air conditioner, be under the situation of one drag two air-conditioning system of two indoor sets of an off-premises station band: in two indoor sets, only have one when in running order, the operating load of one drag two air-conditioning system is less than or equal to default load; When two indoor sets are all in running order, the operating load of one drag two air-conditioning system is greater than default load.
On the other hand, the invention provides the multi-split air conditioner of the above-mentioned control method of a kind of the present invention of employing, this air-conditioning system comprises: the variable-displacement of constant speed has the two-spool compressor of the first and second rotors, is connected between the low-pressure side refrigerant pipeline and high-pressure side refrigerant pipeline of air-conditioning system; In order to regulate two-spool compressor, with the first or second capacity, discharge selectively the volume controlled four-way device of compression refrigerant, there are four ports, the first and second ports in four ports are communicated with high-pressure side refrigerant pipeline and low-pressure side refrigerant pipeline respectively correspondingly, and the third and fourth port in four ports is communicated with suction side and the exhaust side of two-spool compressor respectively correspondingly.
Preferably, volume controlled four-way device comprises: with the first cross valve of four ports, wherein, the first port is communicated with bitrochanteric exhaust outlet and high-pressure side refrigerant pipeline respectively, the second port is communicated with low-pressure side refrigerant pipeline, the 3rd port is communicated with bitrochanteric air entry, and the 4th port is communicated with the exhaust outlet of the first rotor; And control the magnetic valve that the first cross valve switches between two paths, in one of two paths, the first port and the 4th port communicate and the second port and the 3rd port communicate, and in another path of two paths, the 4th port communicates with the 3rd port and the first port and the second port all seal.
Preferably, air-conditioning system of the present invention also comprises: be connected to the gas-liquid separator on low-pressure side refrigerant pipeline, wherein along refrigerant, return to the direction of compressor, gas-liquid separator is at the upstream end of the second port of volume controlled four-way device.
Preferably, multi-split air conditioner is the one drag two air-conditioning system of two indoor sets of an off-premises station band.
Preferably, off-premises station, compressor, volume controlled four-way device and gas-liquid separator are installed in outdoor.
Useful technique effect of the present invention is:
Control method of the present invention, comparative result according to the operating load of air-conditioning system with default load, controlling two rotors of the variable-displacement two-spool compressor of constant speed works together, selectively refrigerant is carried out to single stage compress or two-stage compression, thereby the refrigerant circulation of air-conditioning system and the operating load of air-conditioning system are mated mutually.Wherein said single stage compress is that two rotors compress the refrigerant from low-pressure side refrigerant pipeline respectively independently, and the compressed object of two rotors is all the refrigerants from low-pressure side refrigerant pipeline that do not have through overcompression; Wherein said two-stage compression be from the refrigerant of low-pressure side refrigerant pipeline first through a rotor compression again through another rotor compression.
Correspondingly, multi-split air conditioner of the present invention, adopts the variable-displacement two-spool compressor of constant speed, and regulates compressor with the first or second capacity, to discharge selectively the volume controlled four-way device of compression refrigerant, can obtain above-mentioned technique effect equally.
Accompanying drawing explanation
Fig. 1 is the structural representation of multi-split air conditioner of the present invention.
The specific embodiment
The specific embodiment of the present invention is below described.
What the present invention is directed to is multi-split air conditioner, well known to a person skilled in the art the air-conditioning system of a plurality of indoor sets of off-premises station band, and described off-premises station is with outdoor heat exchanger, and indoor set is with indoor heat exchanger.When air-conditioning system is during in indoor refrigeration, outdoor heat exchanger plays the effect of condenser, the effect that indoor heat exchanger plays evaporimeter; When air-conditioning system is during in indoor heating, indoor heat exchanger plays the effect of condenser, the effect that outdoor heat exchanger plays evaporimeter.This air-conditioning system has compressor, and compressor is connected between the high-pressure side refrigerant pipeline and low-pressure side refrigerant pipeline of air-conditioning system.During work, after being compressed by compressor from the refrigerant of low-pressure side refrigerant pipeline, enter in described high-pressure side refrigerant pipeline, high-pressure side refrigerant pipeline is introduced condenser by refrigerant and is carried out condensation, condensed refrigerant is sent in described low-pressure side refrigerant pipeline after evaporator evaporation again, compressor sucks refrigerant from low-pressure side refrigerant pipeline and compresses, circulation and so forth.
Based on above content, the control method of multi-split air conditioner of the present invention is described, this control method for air-conditioning system adopted the variable-displacement two-spool compressor (thering is the first rotor and the second rotor) of constant speed, and this compressor is connected between the low-pressure side refrigerant pipeline and high-pressure side refrigerant pipeline of air-conditioning system.In order to be more expressly understood control method of the present invention, can be referring to the air-conditioning system shown in Fig. 1.Particularly, control method of the present invention comprises the following steps (1)-(3):
(1) operating load of air-conditioning system and default load are compared.
(2) when operating load is less than or equal to default load, the first rotor of controlling compressor 13 compresses the refrigerant from low-pressure side refrigerant pipeline 201, then makes the refrigerant after the first rotor compression after the second rotor compression of compressor 13, just enter high-pressure side refrigerant pipeline 202 again.So, 13 pairs of refrigerants of compressor have carried out two-stage compression, then just offer high-pressure side refrigerant pipeline 202, and the compression refrigerant capacity definition wherein providing is the first capacity, and this first capacity equals the capacity of the first rotor.
(3) when operating load is greater than default load, control the first rotor of compressor 13 works together with the second rotor, with the refrigerant to from low-pressure side refrigerant pipeline 201, carry out entering high-pressure side refrigerant pipeline 202 after single stage compress, the compression refrigerant capacity definition that wherein now enters high-pressure side refrigerant pipeline 202 is the second capacity, and this second capacity equals the first rotor and bitrochanteric capacity sum.Obviously wherein the second capacity is greater than the first capacity.
For ease of understanding, single stage compress is further explained as follows: the path from air entry to exhaust outlet of the first rotor of compressor 13, be in parallel rather than connect with bitrochanteric path from air entry to exhaust outlet, the compressed object of two rotors is all the refrigerants less than the low-pressure side refrigerant pipeline from air-conditioning system through overcompression.
Further, at multi-split air conditioner, be under the situation of an off-premises station 15 with the one drag two air-conditioning system of two indoor sets 21,22: in two indoor sets 21,22, only have one when in running order, the operating load of one drag two air-conditioning system is less than or equal to default load, now can control compressor refrigerant is carried out to two-stage compression, repeat no more herein; When two indoor sets 21,22 are all in running order, the operating load of one drag two air-conditioning system is greater than default load, now can control compressor refrigerant is carried out to single stage compress, repeats no more herein.
No matter it may be noted that in the present invention it is single stage compress or two-stage compression, two rotors of compressor are all in running order; Especially for two-stage compression, although two rotors are all in running order, but only have the first rotor to participate in the low-pressure side refrigerant circulation of air-conditioning system, and the second rotor is not participated in low-pressure side refrigerant circulation, the second rotor just compresses the refrigerant after the first rotor compression.Compare with documents 1 thus, the present invention makes the refrigerant circulation of air-conditioning system equal the capacity of the first rotor by two-stage compression, and documents 1 is by rotor of bypass, its essence is that employing only carries out just discharge (refrigerant not being carried out to two-stage compression) after one-level compression by a rotor to refrigerant, these are completely different from the present invention.
In addition, in the present invention, the operating load of air-conditioning system is less than or equal to the situation of default load, just two indoor sets only have the situation of an indoor set job in one drag two air-conditioning system, can certainly be other situations (for example: be one drag two operation, cryogenic refrigeration and high temperature heating condition); Similarly, operating load is greater than the situation of default load, and two indoor sets in running order situation all in one drag two air-conditioning system just can be also other situations (for example: be one drag two operation, high-temperature refrigeration and low-temperature heating operating mode).
Thus, control method of the present invention is controlled the variable-displacement two-spool compressor of constant speed, according to the variation of running load, to system high pressure side refrigerant pipeline, provide the compression refrigerant of the first capacity or the second capacity, thereby the operating load of having realized air-conditioning system mates mutually with the refrigerant circulation in air-conditioning system.
On the other hand, the present invention also provides a kind of multi-split air conditioner, it adopts the aforesaid control method that relates to single stage compress and two-stage compression of the present invention, referring to Fig. 1, air-conditioning system of the present invention comprises: the variable-displacement two-spool compressor 13(of constant speed has the first and second rotors), be for example connected to, for example, between the low-pressure side refrigerant pipeline (indicate in Fig. 1 201) of air-conditioning system and high-pressure side refrigerant pipeline (indicate in Fig. 1 202); And volume controlled four-way device 12, in order to regulate compressor to discharge compression refrigerant with the first or second capacity selectively.Wherein volume controlled four-way device 12 has four port D, S, C, E, the first port D is communicated with high-pressure side refrigerant pipeline 202, the second port E is communicated with low-pressure side refrigerant pipeline 201, and the 3rd port S is communicated with the suction side of compressor, and the 4th port C is communicated with the exhaust side of compressor.
Further, the magnetic valve that in the present invention, volume controlled four-way device 12 can comprise the first cross valve and control the first cross valve commutation, wherein four of the first cross valve ports form four ports of volume controlled four-way device 12.As can be seen from Figure 1, the first port D is communicated with bitrochanteric exhaust outlet 104 and the high-pressure side refrigerant pipeline 202 of two-spool compressor 13 respectively, the second port E is communicated with low-pressure side refrigerant pipeline 201, the 3rd port S is communicated with bitrochanteric air entry 103, and the 4th port C is communicated with the exhaust outlet 102 of the first rotor.Solenoid control the first cross valve commutates between two paths, and one of them path (magnetic valve power on/off is in OFF state) is: the first port D and the 4th port C communicate, and the second port E and the 3rd port S communicate; Another path (magnetic valve is switched in ON state) is: the 4th port C communicates with the 3rd port S, and the first port D does not all seal and communicates with other port with the second port E.
As can be seen from Figure 1, air-conditioning system of the present invention comprises: be connected to the gas-liquid separator 11 on low-pressure side refrigerant pipeline 201, wherein along refrigerant, return to the direction of compressor 13, gas-liquid separator 11 is at the upstream end of the second port E of volume controlled four-way device 12.
Fig. 1 also shows: multi-split air conditioner is the situation of one drag two air-conditioning system, and an off-premises station 15 is with two indoor sets 21,22; The second cross valve 14, is connected to bitrochanteric exhaust outlet 104 places of compressor 13, and the bitrochanteric exhaust outlet 104 of compressor 13 is communicated with the outdoor heat exchanger of off-premises station 15 or the indoor heat exchanger of indoor set 21,22 selectively by the second cross valve 14; And the throttling arrangement 221 that is connected to the fan 17 on off-premises station 15, the throttling arrangement 16 being connected with off-premises station 15, the throttling arrangement 211 being connected with indoor set 21, is connected with indoor set 22.Unceasingly, in Fig. 1, air-conditioning system is divided into and comprises and be arranged on outdoor outdoor unit 1 and be arranged on indoor indoor unit 2.Compressor 13, volume controlled four-way device 12, gas-liquid separator 11, the second cross valve 14, throttling arrangement 16 all belong to outdoor unit 1; Indoor set 21 and 22, throttling arrangement 211 and 221 all belong to indoor unit 2.
Air-conditioning system of the present invention, by off-premises station Electronic Control Assembly, compares the operating load of air-conditioning system and default load, and according to comparative result, controls the variable-displacement two-spool compressor of constant speed.Wherein, outdoor Electronic Control Assembly can receive coil temperature input, the input of indoor set running status of outdoor environment temperature input, outdoor heat exchanger.The signal output part of outdoor Electronic Control Assembly comprises: the signal output part of the signal output part of the signal output part being connected with volume controlled four-way device, the output commutation signal being connected with the second cross valve, the output fan control signal that is connected with fan on off-premises station, the signal output part being connected with compressor.
To sum up, control method of the present invention, comparative result according to the operating load of air-conditioning system with default load, two rotors controlling the variable-displacement two-spool compressor of constant speed carry out single stage compress or two-stage compression to refrigerant, thereby the refrigerant circulation of air-conditioning system and the operating load of air-conditioning system are mated mutually.Correspondingly, multi-split air conditioner of the present invention, adopts the variable-displacement two-spool compressor of constant speed, and regulates compressor with the first or second capacity, to discharge selectively the volume controlled four-way device of compression refrigerant, has obtained equally above-mentioned technique effect.
The foregoing is only the preferred embodiments of the present invention, be not limited to the present invention, for a person skilled in the art, the present invention can have various modifications and variations.Within the spirit and principles in the present invention all, any modification of doing, be equal to replacement, improvement etc., within all should being included in protection scope of the present invention.
Claims (8)
1. the control method of a multi-split air conditioner, described air-conditioning system comprises: the variable-displacement of constant speed has the two-spool compressor (13) of the first and second rotors, be connected between the low-pressure side refrigerant pipeline (201) and high-pressure side refrigerant pipeline (202) of described air-conditioning system, described method comprises:
The operating load of described air-conditioning system and default load are compared;
When described operating load is less than or equal to default load, control described the first rotor to the refrigerant compression from described low-pressure side refrigerant pipeline (201), then make the refrigerant after described the first rotor compression after the second rotor compression, just enter again described high-pressure side refrigerant pipeline (202);
When described operating load is greater than default load, controls described the first rotor and the refrigerant from described low-pressure side refrigerant pipeline (201) is carried out entering described high-pressure side refrigerant pipeline (202) after single stage compress together with the second rotor.
2. control method according to claim 1, is characterized in that,
When described operating load is less than or equal to default load, the capacity that the coolant quantity that enters described high-pressure side refrigerant pipeline (202) is described the first rotor;
When described operating load is greater than default load, the coolant quantity that enters described high-pressure side refrigerant pipeline (202) is described the first rotor and bitrochanteric capacity sum.
3. control method according to claim 2, is characterized in that,
At described multi-split air conditioner, be under the situation of an off-premises station (15) with the one drag two air-conditioning system of two indoor sets (21,22):
In described two indoor sets (21,22), only have one when in running order, the operating load of described one drag two air-conditioning system is less than or equal to default load;
When described two indoor sets (21,22) are all in running order, the operating load of described one drag two air-conditioning system is greater than default load.
4. adopt in claim 1-3 a multi-split air conditioner for method described in any one, comprising:
The variable-displacement of constant speed has the two-spool compressor (13) of the first and second rotors, is connected between the low-pressure side refrigerant pipeline (201) and high-pressure side refrigerant pipeline (202) of described air-conditioning system;
Regulate described two-spool compressor (13) with the first or second capacity, to discharge selectively the volume controlled four-way device (12) of compression refrigerant, there are four ports (D, S, C, E),
Wherein, the first and second ports (D, E) in described four ports are communicated with described high-pressure side refrigerant pipeline (202) and described low-pressure side refrigerant pipeline (201) respectively correspondingly, and the third and fourth port (S, C) in described four ports is communicated with suction side and the exhaust side of described two-spool compressor (13) respectively correspondingly.
5. multi-split air conditioner according to claim 4, is characterized in that, described volume controlled four-way device (12) comprising:
The first cross valve with described four ports (D, S, C, E), wherein, described the first port (D) is communicated with described bitrochanteric exhaust outlet (104) and described high-pressure side refrigerant pipeline (202) respectively, described the second port (E) is communicated with described low-pressure side refrigerant pipeline (201), described the 3rd port (S) is communicated with described bitrochanteric air entry (103), and described the 4th port (C) is communicated with the exhaust outlet (102) of described the first rotor; And
Control the magnetic valve that described the first cross valve switches between two paths, wherein, at the first port described in one of described two paths (D) with the 4th port (C) communicates and described the second port (E) and the 3rd port (S) communicate, at the 4th port (C) described in another path of described two paths, communicate with the 3rd port (S) and described the first port (D) all seals with the second port (E).
6. multi-split air conditioner according to claim 5, is characterized in that,
Also comprise: be connected to the gas-liquid separator (11) on described low-pressure side refrigerant pipeline (201), wherein along described refrigerant, return to the direction of described two-spool compressor (13), described gas-liquid separator (11) is at the upstream end of second port (E) of described volume controlled four-way device (12).
7. multi-split air conditioner according to claim 6, is characterized in that, described multi-split air conditioner is that an off-premises station (15) is with the one drag two air-conditioning system of two indoor sets (21,22).
8. multi-split air conditioner according to claim 7, is characterized in that, described off-premises station (15), two-spool compressor (13), volume controlled four-way device (12) and gas-liquid separator (11) are installed in outdoor.
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| CN201210017448.5A CN102563812B (en) | 2012-01-19 | 2012-01-19 | Multi-split air-conditioning system and control method thereof |
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