CN104215001A - Double-stage compressor air-conditioner system and control method thereof - Google Patents
Double-stage compressor air-conditioner system and control method thereof Download PDFInfo
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- CN104215001A CN104215001A CN201410328350.0A CN201410328350A CN104215001A CN 104215001 A CN104215001 A CN 104215001A CN 201410328350 A CN201410328350 A CN 201410328350A CN 104215001 A CN104215001 A CN 104215001A
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- expansion valve
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- stage compressor
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- electron expansion
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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
Abstract
The invention provides a double-stage compressor air-conditioner system and a control method of the double-stage compressor air-conditioner system. The double-stage compressor air-conditioner system comprises a double-stage compressor, a four-way valve, an indoor heat exchanger, an outdoor heat exchanger, a flash evaporator, a first electronic expansion valve, a second electronic expansion valve and a control unit, wherein the four-way valve is connected to an exhaust port and a low-pressure inlet of the double-stage compressor; the flash evaporator is connected between the indoor heat exchanger and the outdoor heat exchanger and is connected with a medium-pressure inlet of the double-stage compressor; the first electronic expansion valve is connected between the indoor heat exchanger and the flash evaporator; the second electronic expansion valve is connected between the outdoor heat exchanger and the flash evaporator; in a refrigerating mode, the first electronic expansion valve is a secondary electronic expansion valve; in a heating mode, the second electronic expansion valve is the secondary electronic expansion valve; the control unit is used for controlling the opening degree of the secondary electronic expansion valve, so as to guarantee the pressure balance in the double-stage compressor. According to the technical scheme of the invention, on the premise of guaranteeing that the double-stage compressor is safe and reliable, the usage amount of electromagnetic-valve switching devices is reduced, and the production cost of a product is lowered.
Description
Technical field
The present invention relates to air-conditioner technical field, in particular to the control method of a kind of double-stage compressor air-conditioner system and a kind of double-stage compressor air-conditioner system.
Background technology
Along with air-conditioner uses the expanding day of crowd, the instructions for use of user to air-conditioner is also more and more higher.Traditional domestic air conditioner is all the compressor adopting one stage of compression, and the compressor of one stage of compression only has an exhaust outlet and a gas returning port, and under ultralow-temperature operation conditions, heating capacity is relatively poor, can not meet the demand of cold district user.
For the problems referred to above, propose the air-conditioner adopting Two-stage Compression in correlation technique, achieve and heat powerful effect under ultralow-temperature operation conditions, the dark welcome by user.
But, the air-conditioner of Two-stage Compression is higher to the requirement of air conditioning system maker in reliability, current Two-stage Compression air-conditioner, all be based upon on the basis of high cost, rely on and increase the reliability that the electronic control switch such as magnetic valve and electric expansion valve ensures system, and increase magnetic valve and electric expansion valve can cause control logic complicated.Meanwhile, if cause electromagnetic valve switch failure of apparatus due to device aging or other reasons, also serious potential safety hazard can be caused.
Nonetheless, the progradation of Two-stage Compression still more slowly, subject matter is that double-stage compressor is with an exhaust outlet and two gas returning ports (namely press-in mouth and low-pressure inlet), the control of the return-air amount of two gas returning ports is directly determined to the performance of Two-stage Compression air-conditioner, for the air-conditioner of one stage of compression, as long as just can be completed the control of capacity to system and return-air amount by the refrigerant flow in control system, but for double-stage compressor, not only to control capacity and return-air amount, also to make full use of the advantage of double-stage compressor, rational control mode is adopted to distribute the cold medium flux of two gas returning ports, just can reach efficient to Two-stage Compression and use reliably.
Therefore, how can guarantee under the prerequisite that double-stage compressor is safe and reliable, reduce the use amount of electromagnetic valve switch device, become technical problem urgently to be resolved hurrily with the production cost reducing product.
Summary of the invention
The present invention is intended at least to solve one of technical problem existed in prior art or correlation technique.
For this reason, the object of the invention is to propose and a kind ofly can guarantee under the prerequisite that double-stage compressor is safe and reliable, reduce the use amount of electromagnetic valve switch device, reduce double-stage compressor air-conditioner system and the control method thereof of the production cost of product.
For achieving the above object, embodiment according to a first aspect of the invention, proposes a kind of double-stage compressor air-conditioner system, comprising: double-stage compressor, has exhaust outlet, low-pressure inlet and middle press-in mouth; Cross valve, the first end of described cross valve is connected to the exhaust outlet of described double-stage compressor, and the second end of described cross valve is connected to the low-pressure inlet of described double-stage compressor; Indoor heat exchanger, the first end of described indoor heat exchanger is connected to the 3rd end of described cross valve; Outdoor heat exchanger, the first end of described outdoor heat exchanger is connected to the 4th end of described cross valve; Flash vessel, is connected between the second end of described indoor heat exchanger and the second end of described outdoor heat exchanger, and be pressed into mouth in described double-stage compressor and be connected; First electric expansion valve, is connected between described indoor heat exchanger and described flash vessel; Second electric expansion valve, is connected between described outdoor heat exchanger and described flash vessel; Wherein, when described double-stage compressor air-conditioner system carries out work in a chiller mode, described first electric expansion valve is secondary electron expansion valve, described second electric expansion valve is primary electron expansion valve, and when described double-stage compressor air-conditioner system carries out work with heating mode, described first electric expansion valve is primary electron expansion valve, and described second electric expansion valve is secondary electron expansion valve; Control unit, is connected to described secondary electron expansion valve, for after described double-stage compressor starts, controls, to guarantee the pressure balance in described double-stage compressor to the aperture of described secondary electron expansion valve.
Double-stage compressor air-conditioner system according to an embodiment of the invention, by after double-stage compressor starts, the aperture of secondary electron expansion valve is controlled, make it possible to pressing the pressure of porch to control in double-stage compressor, and then the pressure balance can guaranteeing in double-stage compressor, run safely and reliably to realize air-conditioner system, compared to adopting extra electric expansion valve and magnetic valve to guarantee the reliability of system in correlation technique, the application not only reduces the production cost of product, and can reduce the complexity of control logic.
In addition, double-stage compressor air-conditioner system according to the above embodiment of the present invention, can also have following additional technical characteristic:
According to one embodiment of present invention, also comprising: state detection unit, whether operating steadily for detecting described double-stage compressor; Described control unit also for: when described state detection unit detects that described double-stage compressor off-duty is steady, control described secondary electron expansion valve and open completely.
Double-stage compressor air-conditioner system according to an embodiment of the invention, by when double-stage compressor off-duty is steady, control secondary electron expansion valve to open completely, be pressed into mouth during a large amount of refrigerants after primary electron expansion valve can be avoided by double-stage compressor and enter in double-stage compressor and cause double-stage compressor liquid hammer.
Simultaneously, in order to avoid a large amount of refrigerants after primary electron expansion valve by double-stage compressor in be pressed into mouth and enter in double-stage compressor and cause double-stage compressor liquid hammer, according to one embodiment of present invention, control unit can also be connected to described primary electron expansion valve, with when described secondary electron expansion valve is opened completely, control the aperture of described primary electron expansion valve, to guarantee that the coolant quantity flowing through described primary electron expansion valve is less than or equal to the coolant quantity flowing through described secondary electron expansion valve.
According to one embodiment of present invention, also comprise: pressure sensing cell, for after described double-stage compressor operates steadily, detect the force value of described exhaust outlet, the described force value of middle press-in mouth and the force value of described low-pressure inlet respectively; Described control unit also for the aperture that regulates described secondary electron expansion valve according to the force value of described exhaust outlet, the described force value of middle press-in mouth and the force value of described low-pressure inlet, to make the pressure balance in described double-stage compressor.
Double-stage compressor air-conditioner system according to an embodiment of the invention, by detecting the exhaust port pressure value of double-stage compressor, the middle force value of press-in mouth and the force value of low-pressure inlet, make it possible to more accurately control the aperture of secondary electron expansion valve, and then effectively can guarantee the pressure balance in double-stage compressor.
According to one embodiment of present invention, described control unit concrete also for: in the pressure value P of described exhaust outlet
1, described middle press-in mouth pressure value P
2with the pressure value P of described low-pressure inlet
3meet P
1× P
3> K × P
2 2time, reduce the aperture of described secondary electron expansion valve, and in the pressure value P of described exhaust outlet
1, described middle press-in mouth pressure value P
2with the pressure value P of described low-pressure inlet
3meet P
1× P
3< K × P
2 2time, increase the aperture of described secondary electron expansion valve, until the pressure value P of described exhaust outlet
1, described middle press-in mouth pressure value P
2with the pressure value P of described low-pressure inlet
3meet P
1× P
3=K × P
2 2, wherein, described K is the constant be between 0.5 to 1.
Double-stage compressor air-conditioner system according to an embodiment of the invention, due to the pressure value P at exhaust outlet
1, middle press-in mouth pressure value P
2with the pressure value P of low-pressure inlet
3meet P
1× P
3=K × P
2 2time, the pressure in double-stage compressor can not only balance, and can carry out work with optimized running status, therefore, and can by P
1× P
3=K × P
2 2as the adjustment criteria to secondary electron expansion valve.Wherein, K needs to determine according to the configuration of the air-conditioner system of reality, usually can use 0.7225.
According to one embodiment of present invention, described control unit is concrete also for the aperture progressively reducing described secondary electron expansion valve according to predetermined speed.
Double-stage compressor air-conditioner system according to an embodiment of the invention, by after double-stage compressor operates steadily, the aperture of secondary electron expansion valve is reduced gradually according to set rate, the coolant quantity of the middle press-in mouth entering double-stage compressor can be increased gradually, and then guarantee that air-conditioner system carries out work with the running status of optimum, avoid the aperture of secondary electron expansion valve to change the too fast coolant quantity of middle press-in mouth that causes too much, cause the pressure imbalance in double-stage compressor liquid hammer or double-stage compressor.
According to one embodiment of present invention, described control unit also for: in the pressure value P of described exhaust outlet
1, described middle press-in mouth pressure value P
2with the pressure value P of described low-pressure inlet
3meet P
1× P
3=K × P
2 2afterwards, the aperture of regulative mode to described secondary electron expansion valve according to described primary electron expansion valve regulates, after guaranteeing the aperture adjustment that described secondary electron expands, and the pressure value P of described exhaust outlet
1, described middle press-in mouth pressure value P
2with the pressure value P of described low-pressure inlet
3continue to meet P
1× P
3=K × P
2 2.
In technique scheme, preferably, described control unit concrete also for: after the aperture increasing described primary electron expansion valve, interval increases the aperture of described secondary electron expansion valve after a predetermined time, and after the aperture reducing described primary electron expansion valve, reduce the aperture of described secondary electron expansion valve through described predetermined time interval.
Double-stage compressor air-conditioner system according to an embodiment of the invention, regulated by the aperture of regulative mode to secondary electron expansion valve according to primary electron expansion valve, namely after the aperture of primary electron expansion valve increases, also the aperture of secondary electron expansion valve is increased, after the aperture of primary electron expansion valve reduces, also the aperture of secondary electron expansion valve is reduced, make to enter in double-stage compressor the coolant quantity being pressed into mouth can balance, avoid entering in double-stage compressor the coolant quantity being pressed into mouth to uprush or anticlimax and affect the performance of double-stage compressor and the stability of air-conditioner system.Wherein, predetermined time interval can be 10 seconds.
According to one embodiment of present invention, described state detection unit is specifically for the running frequency that detects described double-stage compressor, when described running frequency miss the mark frequency, determine that described double-stage compressor off-duty is steady, and when described running frequency reaches described target frequency, determine that described double-stage compressor operates steadily.
Double-stage compressor air-conditioner system according to an embodiment of the invention, due to double-stage compressor stable after, running frequency can reach steady state value, therefore can by detecting the running frequency of double-stage compressor, to determine whether double-stage compressor operates steadily.
Embodiment according to a second aspect of the present invention, also proposed a kind of control method of double-stage compressor air-conditioner system, for controlling the double-stage compressor air-conditioner system described in above-mentioned any one embodiment, comprise: after the double-stage compressor in described double-stage compressor air-conditioner system starts, the aperture of the secondary electron expansion valve in described double-stage compressor air-conditioner system is controlled, to guarantee the pressure balance in described double-stage compressor.
The control method of double-stage compressor air-conditioner system according to an embodiment of the invention, by after double-stage compressor starts, the aperture of secondary electron expansion valve is controlled, make it possible to pressing the pressure of porch to control in double-stage compressor, and then the pressure balance can guaranteeing in double-stage compressor, run safely and reliably to realize air-conditioner system, compared to adopting extra electric expansion valve and magnetic valve to guarantee the reliability of system in correlation technique, the application not only reduces the production cost of product, and the complexity of control logic can be reduced.
According to one embodiment of present invention, whether the step controlling the aperture of described secondary electron expansion valve is specially: detect described double-stage compressor and operate steadily; When described state detection unit detects that described double-stage compressor off-duty is steady, control described secondary electron expansion valve and open completely.
The control method of double-stage compressor air-conditioner system according to an embodiment of the invention, by when double-stage compressor off-duty is steady, control secondary electron expansion valve to open completely, be pressed into mouth during a large amount of refrigerants after primary electron expansion valve can be avoided by double-stage compressor and enter in double-stage compressor and cause double-stage compressor liquid hammer.
Simultaneously, in order to avoid a large amount of refrigerants after primary electron expansion valve by double-stage compressor in be pressed into mouth and enter in double-stage compressor and cause double-stage compressor liquid hammer, according to one embodiment of present invention, when described secondary electron expansion valve is opened completely, the aperture of described primary electron expansion valve can also be controlled, to guarantee that the coolant quantity flowing through described primary electron expansion valve is less than or equal to the coolant quantity flowing through described secondary electron expansion valve.
According to one embodiment of present invention, also comprise: after described double-stage compressor operates steadily, detect the force value of described exhaust outlet, the described force value of middle press-in mouth and the force value of described low-pressure inlet respectively; The aperture of described secondary electron expansion valve is regulated, to make the pressure balance in described double-stage compressor according to the force value of described exhaust outlet, the described force value of middle press-in mouth and the force value of described low-pressure inlet.
The control method of double-stage compressor air-conditioner system according to an embodiment of the invention, by detecting the exhaust port pressure value of double-stage compressor, the middle force value of press-in mouth and the force value of low-pressure inlet, make it possible to more accurately control the aperture of secondary electron expansion valve, and then effectively can guarantee the pressure balance in double-stage compressor.
According to one embodiment of present invention, the step of the aperture of described secondary electron expansion valve is regulated to be specially according to the force value of described exhaust outlet, the described force value of middle press-in mouth and the force value of described low-pressure inlet: in the pressure value P of described exhaust outlet
1, described middle press-in mouth pressure value P
2with the pressure value P of described low-pressure inlet
3meet P
1× P
3> K × P
2 2time, reduce the aperture of described secondary electron expansion valve, and in the pressure value P of described exhaust outlet
1, described middle press-in mouth pressure value P
2with the pressure value P of described low-pressure inlet
3meet P
1× P
3< K × P
2 2time, increase the aperture of described secondary electron expansion valve, until the pressure value P of described exhaust outlet
1, described middle press-in mouth pressure value P
2with the pressure value P of described low-pressure inlet
3meet P
1× P
3=K × P
2 2, wherein, described K is the constant be between 0.5 to 1.
The control method of double-stage compressor air-conditioner system according to an embodiment of the invention, due to the pressure value P at exhaust outlet
1, middle press-in mouth pressure value P
2with the pressure value P of low-pressure inlet
3meet P
1× P
3=K × P
2 2time, the pressure in double-stage compressor can not only balance, and can carry out work with optimized running status, therefore, and can by P
1× P
3=K × P
2 2as the adjustment criteria to secondary electron expansion valve.Wherein, K needs to determine according to the configuration of the air-conditioner system of reality, usually can use 0.7225.
According to one embodiment of present invention, the step reducing the aperture of described secondary electron expansion valve is specially: the aperture progressively reducing described secondary electron expansion valve according to predetermined speed.
The control method of double-stage compressor air-conditioner system according to an embodiment of the invention, by after double-stage compressor operates steadily, the aperture of secondary electron expansion valve is reduced gradually according to set rate, the coolant quantity of the middle press-in mouth entering double-stage compressor can be increased gradually, and then guarantee that air-conditioner system carries out work with the running status of optimum, avoid the aperture of secondary electron expansion valve to change the too fast coolant quantity of middle press-in mouth that causes too much, cause the pressure imbalance in double-stage compressor liquid hammer or double-stage compressor.
According to one embodiment of present invention, also comprise: in the pressure value P of described exhaust outlet
1, described middle press-in mouth pressure value P
2with the pressure value P of described low-pressure inlet
3meet P
1× P
3=K × P
2 2afterwards, the aperture of regulative mode to described secondary electron expansion valve according to described primary electron expansion valve regulates, after guaranteeing the aperture adjustment that described secondary electron expands, and the pressure value P of described exhaust outlet
1, described middle press-in mouth pressure value P
2with the pressure value P of described low-pressure inlet
3continue to meet P
1× P
3=K × P
2 2.
In technique scheme, preferably, be specially according to the step that the aperture of regulative mode to described secondary electron expansion valve of described primary electron expansion valve regulates: after the aperture increasing described primary electron expansion valve, interval increases the aperture of described secondary electron expansion valve after a predetermined time, and after the aperture reducing described primary electron expansion valve, reduce the aperture of described secondary electron expansion valve through described predetermined time interval.
The control method of double-stage compressor air-conditioner system according to an embodiment of the invention, regulated by the aperture of regulative mode to secondary electron expansion valve according to primary electron expansion valve, namely after the aperture of primary electron expansion valve increases, also the aperture of secondary electron expansion valve is increased, after the aperture of primary electron expansion valve reduces, also the aperture of secondary electron expansion valve is reduced, make to enter in double-stage compressor the coolant quantity being pressed into mouth can balance, avoid entering in double-stage compressor the coolant quantity being pressed into mouth to uprush or anticlimax and affect the performance of double-stage compressor and the stability of air-conditioner system.Wherein, predetermined time interval can be 10 seconds.
According to one embodiment of present invention, detect the step whether described double-stage compressor operate steadily to be specially: the running frequency detecting described double-stage compressor, when described running frequency miss the mark frequency, determine that described double-stage compressor off-duty is steady, and when described running frequency reaches described target frequency, determine that described double-stage compressor operates steadily.
The control method of double-stage compressor air-conditioner system according to an embodiment of the invention, due to double-stage compressor stable after, running frequency can reach steady state value, therefore can by detecting the running frequency of double-stage compressor, to determine whether double-stage compressor operates steadily.
Additional aspect of the present invention and advantage will part provide in the following description, and part will become obvious from the following description, or be recognized by practice of the present invention.
Accompanying drawing explanation
Above-mentioned and/or additional aspect of the present invention and advantage will become obvious and easy understand from accompanying drawing below combining to the description of embodiment, wherein:
Fig. 1 shows the structural representation of double-stage compressor air-conditioner system according to an embodiment of the invention;
Fig. 2 shows the schematic flow diagram of the control method of double-stage compressor air-conditioner system according to an embodiment of the invention;
Fig. 3 shows the schematic flow diagram of the control method of double-stage compressor air-conditioner system when heating mode runs according to an embodiment of the invention.
Detailed description of the invention
In order to more clearly understand above-mentioned purpose of the present invention, feature and advantage, below in conjunction with the drawings and specific embodiments, the present invention is further described in detail.It should be noted that, when not conflicting, the feature in the embodiment of the application and embodiment can combine mutually.
Set forth a lot of detail in the following description so that fully understand the present invention; but; the present invention can also adopt other to be different from other modes described here and implement, and therefore, protection scope of the present invention is not by the restriction of following public specific embodiment.
Fig. 1 shows the structural representation of double-stage compressor air-conditioner system according to an embodiment of the invention.
As shown in Figure 1, double-stage compressor air-conditioner system according to an embodiment of the invention, comprising: double-stage compressor 1, has exhaust outlet 11, low-pressure inlet 12 and middle press-in mouth 13; Cross valve 2, the first end of described cross valve 2 is connected to the exhaust outlet 11 of described double-stage compressor 1, and the second end of described cross valve 2 is connected to the low-pressure inlet 12 of described double-stage compressor 1; Indoor heat exchanger 3, the first end of described indoor heat exchanger 3 is connected to the 3rd end of described cross valve 2; Outdoor heat exchanger 4, the first end of described outdoor heat exchanger 4 is connected to the 4th end of described cross valve 2; Flash vessel 5, between the second end being connected to described indoor heat exchanger 3 and the second end of described outdoor heat exchanger 4, and be pressed into mouth 13 in described double-stage compressor 1 and be connected; First electric expansion valve 6, is connected between described indoor heat exchanger 3 and described flash vessel 5; Second electric expansion valve 7, is connected between described outdoor heat exchanger 4 and described flash vessel 5; Wherein, when described double-stage compressor air-conditioner system carries out work in a chiller mode, described first electric expansion valve 6 is secondary electron expansion valve, described second electric expansion valve 7 is primary electron expansion valve, and when described double-stage compressor air-conditioner system carries out work with heating mode, described first electric expansion valve 6 is primary electron expansion valve, and described second electric expansion valve 7 is secondary electron expansion valve; Control unit (not shown), is connected to described secondary electron expansion valve, for after described double-stage compressor 1 starts, controls, to guarantee the pressure balance in described double-stage compressor 1 to the aperture of described secondary electron expansion valve.
By after double-stage compressor 1 starts, the aperture of secondary electron expansion valve is controlled, the pressure made it possible to being pressed into mouth 13 place in double-stage compressor 1 controls, and then the pressure balance can guaranteeing in double-stage compressor 1, run safely and reliably to realize air-conditioner system, compared to adopting extra electric expansion valve and magnetic valve to guarantee the reliability of system in correlation technique, the application not only reduces the production cost of product, and can reduce the complexity of control logic.
In addition, double-stage compressor air-conditioner system according to the above embodiment of the present invention, can also have following additional technical characteristic:
According to one embodiment of present invention, also comprising: state detection unit (not shown), whether operating steadily for detecting described double-stage compressor 1; Described control unit also for: when described state detection unit detects that described double-stage compressor 1 off-duty is steady, control described secondary electron expansion valve and open completely.
By when double-stage compressor 1 off-duty is steady, control secondary electron expansion valve to open completely, a large amount of refrigerants after primary electron expansion valve can be avoided to cause double-stage compressor 1 liquid hammer by being pressed into mouth 13 in double-stage compressor 1 and entering in double-stage compressor 1.
Simultaneously, in order to avoid a large amount of refrigerants after primary electron expansion valve enter in double-stage compressor 1 by being pressed into mouth 13 in double-stage compressor 1 and causing double-stage compressor 1 liquid hammer, according to one embodiment of present invention, control unit can also be connected to described primary electron expansion valve, with when described secondary electron expansion valve is opened completely, control the aperture of described primary electron expansion valve, to guarantee that the coolant quantity flowing through described primary electron expansion valve is less than or equal to the coolant quantity flowing through described secondary electron expansion valve.
According to one embodiment of present invention, also comprise: pressure sensing cell, for after described double-stage compressor 1 operates steadily, detect the force value of described exhaust outlet 11, the described force value of middle press-in mouth 13 and the force value of described low-pressure inlet 12 respectively; Described control unit also for the aperture that regulates described secondary electron expansion valve according to the force value of described exhaust outlet 11, the described force value of middle press-in mouth 13 and the force value of described low-pressure inlet 12, to make the pressure balance in described double-stage compressor 1.
By detecting the force value of exhaust outlet 11 of double-stage compressor 1, the force value of middle press-in mouth 13 and the force value of low-pressure inlet 12, make it possible to more accurately control the aperture of secondary electron expansion valve, and then effectively can guarantee the pressure balance in double-stage compressor 1.
Wherein, the force value of exhaust outlet 11 can be detected by the pressure sensor 14 be arranged between the exhaust outlet 11 of double-stage compressor 1 and cross valve 2; The force value of low-pressure inlet 12 is detected by the pressure sensor 15 be arranged between the low-pressure inlet 12 of double-stage compressor 1 and cross valve 2; By being pressed into the force value of mouth 13 in being arranged in double-stage compressor 1 pressure sensor 16 be pressed between mouth 13 and flash vessel 5 and detecting.
According to one embodiment of present invention, described control unit concrete also for: in the pressure value P of described exhaust outlet 11
1, described middle press-in mouth 13 pressure value P
2with the pressure value P of described low-pressure inlet 12
3meet P
1× P
3> K × P
2 2time, reduce the aperture of described secondary electron expansion valve, and in the pressure value P of described exhaust outlet 11
1, described middle press-in mouth 13 pressure value P
2with the pressure value P of described low-pressure inlet 12
3meet P
1× P
3< K × P
2 2time, increase the aperture of described secondary electron expansion valve, until the pressure value P of described exhaust outlet 11
1, described middle press-in mouth 13 pressure value P
2with the pressure value P of described low-pressure inlet 12
3meet P
1× P
3=K × P
2 2, wherein, described K is in the constant between numerical value 0.5 to numerical value 1.
Due to the pressure value P at exhaust outlet 11
1, middle press-in mouth 13 pressure value P
2with the pressure value P of low-pressure inlet 12
3meet P
1× P
3=K × P
2 2time, the pressure in double-stage compressor 1 can not only balance, and can carry out work with optimized running status, therefore, and can by P
1× P
3=K × P
2 2as the adjustment criteria to secondary electron expansion valve.Wherein, K needs to determine according to the configuration of the air-conditioner system of reality, usually can use 0.7225.
According to one embodiment of present invention, described control unit is concrete also for the aperture progressively reducing described secondary electron expansion valve according to predetermined speed.
By after double-stage compressor 1 operates steadily, the aperture of secondary electron expansion valve is reduced gradually according to set rate, the coolant quantity of the middle press-in mouth 13 entering double-stage compressor 1 can be increased gradually, and then guarantee that air-conditioner system carries out work with the running status of optimum, avoid the aperture of secondary electron expansion valve to change the too fast coolant quantity of middle press-in mouth 13 that causes too much, cause the pressure imbalance in double-stage compressor 1 liquid hammer or double-stage compressor 1.
According to one embodiment of present invention, described control unit also for: in the pressure value P of described exhaust outlet 11
1, described middle press-in mouth 13 pressure value P
2with the pressure value P of described low-pressure inlet 12
3meet P
1× P
3=K × P
2 2afterwards, the aperture of regulative mode to described secondary electron expansion valve according to described primary electron expansion valve regulates, after guaranteeing the aperture adjustment that described secondary electron expands, and the pressure value P of described exhaust outlet 11
1, described middle press-in mouth 13 pressure value P
2with the pressure value P of described low-pressure inlet 12
3continue to meet P
1× P
3=K × P
2 2.
In technique scheme, preferably, described control unit concrete also for: after the aperture increasing described primary electron expansion valve, interval increases the aperture of described secondary electron expansion valve after a predetermined time, and after the aperture reducing described primary electron expansion valve, reduce the aperture of described secondary electron expansion valve through described predetermined time interval.
Regulated by the aperture of regulative mode to secondary electron expansion valve according to primary electron expansion valve, namely after the aperture of primary electron expansion valve increases, also the aperture of secondary electron expansion valve is increased, after the aperture of primary electron expansion valve reduces, also the aperture of secondary electron expansion valve is reduced, make to enter the coolant quantity being pressed into mouth 13 in double-stage compressor 1 can balance, avoid entering the coolant quantity being pressed into mouth 13 in double-stage compressor 1 and uprush or anticlimax and affect the performance of double-stage compressor 1 and the stability of air-conditioner system.Wherein, predetermined time interval can be 10 seconds.
According to one embodiment of present invention, described state detection unit is specifically for the running frequency that detects described double-stage compressor 1, when described running frequency miss the mark frequency, determine that described double-stage compressor 1 off-duty is steady, and when described running frequency reaches described target frequency, determine that described double-stage compressor 1 operates steadily.
Due to double-stage compressor 1 stable after, running frequency can reach steady state value, therefore can by detecting the running frequency of double-stage compressor 1, to determine whether double-stage compressor 1 operates steadily.
Fig. 2 shows the schematic flow diagram of the control method of double-stage compressor air-conditioner system according to an embodiment of the invention.
As shown in Figure 2, the control method of double-stage compressor air-conditioner system according to an embodiment of the invention, for controlling the double-stage compressor air-conditioner system shown in Fig. 1, comprise: step 202, after double-stage compressor in described double-stage compressor air-conditioner system starts, the aperture of the secondary electron expansion valve in described double-stage compressor air-conditioner system is controlled, to guarantee the pressure balance in described double-stage compressor.
By after double-stage compressor starts, the aperture of secondary electron expansion valve is controlled, make it possible to pressing the pressure of porch to control in double-stage compressor, and then the pressure balance can guaranteeing in double-stage compressor, run safely and reliably to realize air-conditioner system, compared to adopting extra electric expansion valve and magnetic valve to guarantee the reliability of system in correlation technique, the application not only reduces the production cost of product, and can reduce the complexity of control logic.
According to one embodiment of present invention, whether the step controlling the aperture of described secondary electron expansion valve is specially: detect described double-stage compressor and operate steadily; When described state detection unit detects that described double-stage compressor off-duty is steady, control described secondary electron expansion valve and open completely.
By when double-stage compressor off-duty is steady, controls secondary electron expansion valve and open completely, be pressed into mouth during a large amount of refrigerants after primary electron expansion valve can be avoided by double-stage compressor and enter in double-stage compressor and cause double-stage compressor liquid hammer.
Simultaneously, in order to avoid a large amount of refrigerants after primary electron expansion valve by double-stage compressor in be pressed into mouth and enter in double-stage compressor and cause double-stage compressor liquid hammer, according to one embodiment of present invention, when described secondary electron expansion valve is opened completely, the aperture of described primary electron expansion valve can also be controlled, to guarantee that the coolant quantity flowing through described primary electron expansion valve is less than or equal to the coolant quantity flowing through described secondary electron expansion valve.
According to one embodiment of present invention, also comprise: after described double-stage compressor operates steadily, detect the force value of described exhaust outlet, the described force value of middle press-in mouth and the force value of described low-pressure inlet respectively; The aperture of described secondary electron expansion valve is regulated, to make the pressure balance in described double-stage compressor according to the force value of described exhaust outlet, the described force value of middle press-in mouth and the force value of described low-pressure inlet.
By detecting the exhaust port pressure value of double-stage compressor, the middle force value of press-in mouth and the force value of low-pressure inlet, make it possible to more accurately control the aperture of secondary electron expansion valve, and then effectively can guarantee the pressure balance in double-stage compressor.
According to one embodiment of present invention, the step of the aperture of described secondary electron expansion valve is regulated to be specially according to the force value of described exhaust outlet, the described force value of middle press-in mouth and the force value of described low-pressure inlet: in the pressure value P of described exhaust outlet
1, described middle press-in mouth pressure value P
2with the pressure value P of described low-pressure inlet
3meet P
1× P
3> K × P
2 2time, reduce the aperture of described secondary electron expansion valve, and in the pressure value P of described exhaust outlet
1, described middle press-in mouth pressure value P
2with the pressure value P of described low-pressure inlet
3meet P
1× P
3< K × P
2 2time, increase the aperture of described secondary electron expansion valve, until the pressure value P of described exhaust outlet
1, described middle press-in mouth pressure value P
2with the pressure value P of described low-pressure inlet
3meet P
1× P
3=K × P
2 2, wherein, described K is the constant be between 0.5 to 1.
Due to the pressure value P at exhaust outlet
1, middle press-in mouth pressure value P
2with the pressure value P of low-pressure inlet
3meet P
1× P
3=K × P
2 2time, the pressure in double-stage compressor can not only balance, and can carry out work with optimized running status, therefore, and can by P
1× P
3=K × P
2 2as the adjustment criteria to secondary electron expansion valve.Wherein, K needs to determine according to the configuration of the air-conditioner system of reality, usually can use 0.7225.
According to one embodiment of present invention, the step reducing the aperture of described secondary electron expansion valve is specially: the aperture progressively reducing described secondary electron expansion valve according to predetermined speed.
By after double-stage compressor operates steadily, the aperture of secondary electron expansion valve is reduced gradually according to set rate, the coolant quantity of the middle press-in mouth entering double-stage compressor can be increased gradually, and then guarantee that air-conditioner system carries out work with the running status of optimum, avoid the aperture of secondary electron expansion valve to change the too fast coolant quantity of middle press-in mouth that causes too much, cause the pressure imbalance in double-stage compressor liquid hammer or double-stage compressor.
According to one embodiment of present invention, also comprise: in the pressure value P of described exhaust outlet
1, described middle press-in mouth pressure value P
2with the pressure value P of described low-pressure inlet
3meet P
1× P
3=K × P
2 2afterwards, the aperture of regulative mode to described secondary electron expansion valve according to described primary electron expansion valve regulates, after guaranteeing the aperture adjustment that described secondary electron expands, and the pressure value P of described exhaust outlet
1, described middle press-in mouth pressure value P
2with the pressure value P of described low-pressure inlet
3continue to meet P
1× P
3=K × P
2 2.
In technique scheme, preferably, be specially according to the step that the aperture of regulative mode to described secondary electron expansion valve of described primary electron expansion valve regulates: after the aperture increasing described primary electron expansion valve, interval increases the aperture of described secondary electron expansion valve after a predetermined time, and after the aperture reducing described primary electron expansion valve, reduce the aperture of described secondary electron expansion valve through described predetermined time interval.
Regulated by the aperture of regulative mode to secondary electron expansion valve according to primary electron expansion valve, namely after the aperture of primary electron expansion valve increases, also the aperture of secondary electron expansion valve is increased, after the aperture of primary electron expansion valve reduces, also the aperture of secondary electron expansion valve is reduced, make to enter in double-stage compressor the coolant quantity being pressed into mouth can balance, avoid entering in double-stage compressor the coolant quantity being pressed into mouth and uprush or anticlimax and affect the performance of double-stage compressor and the stability of air-conditioner system.Wherein, predetermined time interval can be 10 seconds.
According to one embodiment of present invention, detect the step whether described double-stage compressor operate steadily to be specially: the running frequency detecting described double-stage compressor, when described running frequency miss the mark frequency, determine that described double-stage compressor off-duty is steady, and when described running frequency reaches described target frequency, determine that described double-stage compressor operates steadily.
Due to double-stage compressor stable after, running frequency can reach steady state value, therefore can by detecting the running frequency of double-stage compressor, to determine whether double-stage compressor operates steadily.
Below in conjunction with Fig. 3 for heating mode, detail specifications technical scheme of the present invention.
Fig. 3 shows the schematic flow diagram of the control method of double-stage compressor air-conditioner system when heating mode runs according to an embodiment of the invention.
As shown in Figure 3, the control method of double-stage compressor air-conditioner system when heating mode runs according to an embodiment of the invention, comprising:
Step 302, air-conditioner starts with heating mode, comprise receive heat startup optimization signal and defrosting after receive heating operation signal.
Step 304, the second electric expansion valve standard-sized sheet between outdoor heat exchanger and flash vessel, in a heating mode, the second electric expansion valve and secondary electron expansion valve.
Step 306, judges whether the frequency of compressor reaches target frequency, if so, then performs step 308; Otherwise, return step 304.
Step 308, when judging that the frequency of compressor reaches target frequency, when namely judging the working stability of compressor, to set the aperture that speed reduces the second electric expansion valve.
Step 310, detects exhaust outlet of compressor pressure P
1, low-pressure inlet pressure P
3, middle press-in mouth pressure P
2.
Step 312, judges P
1× P
3=K × P
2 2whether set up, if so, then perform step 316; Otherwise, perform step 314.
Step 314, at judgement P
1× P
3> K × P
2 2time, reduce by the second electronic expansion valve opening, and at judgement P
1× P
3< K × P
2 2time, increase the second electronic expansion valve opening, and continue to perform step 312.
Step 316, at judgement P
1× P
3=K × P
2 2during establishment, regulate the aperture of the second electric expansion valve according to the adjustment trend of the first electric expansion valve between indoor heat exchanger and flash vessel, to maintain P
1× P
3=K × P
2 2.Particularly, as the first electronic expansion valve opening increases, after 10s, the second electronic expansion valve opening increases thereupon, first electronic expansion valve opening reduces, after 10s, the second electronic expansion valve opening reduces thereupon, after the first electric expansion valve is in stable state, the aperture of the second electric expansion valve carries out correction optimization, to reach P
1× P
3=K × P
2 2.
Similarly, when double-stage compressor air-conditioner system runs at refrigeration mode, the first electric expansion valve described in Fig. 3 is controlled as the second electric expansion valve according to the scheme shown in Fig. 3.
More than be described with reference to the accompanying drawings technical scheme of the present invention, consider in correlation technique to rely on and increase the electronic control switch such as magnetic valve and electric expansion valve to ensure the reliability of double-stage compressor air-conditioner system, and increase magnetic valve and electric expansion valve can cause control logic complicated.Therefore, the present invention proposes a kind of new double-stage compressor air-conditioner system and control program thereof, can guarantee under the prerequisite that double-stage compressor is safe and reliable, reduce the use amount of electromagnetic valve switch device, reduce the production cost of product.
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 amendment done, equivalent replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (18)
1. a double-stage compressor air-conditioner system, is characterized in that, comprising:
Double-stage compressor, has exhaust outlet, low-pressure inlet and middle press-in mouth;
Cross valve, the first end of described cross valve is connected to the exhaust outlet of described double-stage compressor, and the second end of described cross valve is connected to the low-pressure inlet of described double-stage compressor;
Indoor heat exchanger, the first end of described indoor heat exchanger is connected to the 3rd end of described cross valve;
Outdoor heat exchanger, the first end of described outdoor heat exchanger is connected to the 4th end of described cross valve;
Flash vessel, is connected between the second end of described indoor heat exchanger and the second end of described outdoor heat exchanger, and be pressed into mouth in described double-stage compressor and be connected;
First electric expansion valve, is connected between described indoor heat exchanger and described flash vessel;
Second electric expansion valve, is connected between described outdoor heat exchanger and described flash vessel;
Wherein, when described double-stage compressor air-conditioner system carries out work in a chiller mode, described first electric expansion valve is secondary electron expansion valve, described second electric expansion valve is primary electron expansion valve, and when described double-stage compressor air-conditioner system carries out work with heating mode, described first electric expansion valve is primary electron expansion valve, and described second electric expansion valve is secondary electron expansion valve;
Control unit, is connected to described secondary electron expansion valve, for after described double-stage compressor starts, controls, to guarantee the pressure balance in described double-stage compressor to the aperture of described secondary electron expansion valve.
2. double-stage compressor air-conditioner system according to claim 1, is characterized in that, also comprise:
Whether state detection unit, operate steadily for detecting described double-stage compressor;
Described control unit also for:
When described state detection unit detects that described double-stage compressor off-duty is steady, control described secondary electron expansion valve and open completely.
3. double-stage compressor air-conditioner system according to claim 2, is characterized in that, described control unit is connected to described primary electron expansion valve, also for:
When described secondary electron expansion valve is opened completely, control the aperture of described primary electron expansion valve, to guarantee that the coolant quantity flowing through described primary electron expansion valve is less than or equal to the coolant quantity flowing through described secondary electron expansion valve.
4. double-stage compressor air-conditioner system according to claim 2, is characterized in that, also comprise:
Pressure sensing cell, for after described double-stage compressor operates steadily, detects the force value of described exhaust outlet, the described force value of middle press-in mouth and the force value of described low-pressure inlet respectively;
Described control unit also for the aperture that regulates described secondary electron expansion valve according to the force value of described exhaust outlet, the described force value of middle press-in mouth and the force value of described low-pressure inlet, to make the pressure balance in described double-stage compressor.
5. double-stage compressor air-conditioner system according to claim 4, is characterized in that, described control unit concrete also for:
In the pressure value P of described exhaust outlet
1, described middle press-in mouth pressure value P
2with the pressure value P of described low-pressure inlet
3meet P
1× P
3> K × P
2 2time, reduce the aperture of described secondary electron expansion valve, and
In the pressure value P of described exhaust outlet
1, described middle press-in mouth pressure value P
2with the pressure value P of described low-pressure inlet
3meet P
1× P
3< K × P
2 2time, increase the aperture of described secondary electron expansion valve, until the pressure value P of described exhaust outlet
1, described middle press-in mouth pressure value P
2with the pressure value P of described low-pressure inlet
3meet P
1× P
3=K × P
2 2, wherein, described K is the constant be between 0.5 to 1.
6. double-stage compressor air-conditioner system according to claim 5, is characterized in that, described control unit concrete also for:
The aperture of described secondary electron expansion valve is progressively reduced according to predetermined speed.
7. double-stage compressor air-conditioner system according to claim 5, is characterized in that, described control unit also for:
In the pressure value P of described exhaust outlet
1, described middle press-in mouth pressure value P
2with the pressure value P of described low-pressure inlet
3meet P
1× P
3=K × P
2 2afterwards, the aperture of regulative mode to described secondary electron expansion valve according to described primary electron expansion valve regulates, after guaranteeing the aperture adjustment that described secondary electron expands, and the pressure value P of described exhaust outlet
1, described middle press-in mouth pressure value P
2with the pressure value P of described low-pressure inlet
3continue to meet P
1× P
3=K × P
2 2.
8. double-stage compressor air-conditioner system according to claim 7, is characterized in that, described control unit concrete also for:
After the aperture increasing described primary electron expansion valve, interval increases the aperture of described secondary electron expansion valve after a predetermined time, and
After the aperture reducing described primary electron expansion valve, reduce the aperture of described secondary electron expansion valve through described predetermined time interval.
9. the double-stage compressor air-conditioner system according to any one of claim 2 to 8, is characterized in that, described state detection unit specifically for:
Detect the running frequency of described double-stage compressor, when described running frequency miss the mark frequency, determine that described double-stage compressor off-duty is steady, and
When described running frequency reaches described target frequency, determine that described double-stage compressor operates steadily.
10. a control method for double-stage compressor air-conditioner system, for controlling double-stage compressor air-conditioner system as claimed in any one of claims 1-9 wherein, is characterized in that, comprise:
Double-stage compressor in described double-stage compressor air-conditioner system controls the aperture of the secondary electron expansion valve in described double-stage compressor air-conditioner system, to guarantee the pressure balance in described double-stage compressor after starting.
The control method of 11. double-stage compressor air-conditioner systems according to claim 10, is characterized in that, the step controlling the aperture of described secondary electron expansion valve is specially:
Detect described double-stage compressor whether to operate steadily;
When described state detection unit detects that described double-stage compressor off-duty is steady, control described secondary electron expansion valve and open completely.
The control method of 12. double-stage compressor air-conditioner systems according to claim 11, is characterized in that, also comprise:
When described secondary electron expansion valve is opened completely, control the aperture of described primary electron expansion valve, to guarantee that the coolant quantity flowing through described primary electron expansion valve is less than or equal to the coolant quantity flowing through described secondary electron expansion valve.
The control method of 13. double-stage compressor air-conditioner systems according to claim 10, is characterized in that, also comprise:
After described double-stage compressor operates steadily, detect the force value of described exhaust outlet, the described force value of middle press-in mouth and the force value of described low-pressure inlet respectively;
The aperture of described secondary electron expansion valve is regulated, to make the pressure balance in described double-stage compressor according to the force value of described exhaust outlet, the described force value of middle press-in mouth and the force value of described low-pressure inlet.
The control method of 14. double-stage compressor air-conditioner systems according to claim 13, it is characterized in that, regulate the step of the aperture of described secondary electron expansion valve to be specially according to the force value of described exhaust outlet, the described force value of middle press-in mouth and the force value of described low-pressure inlet:
In the pressure value P of described exhaust outlet
1, described middle press-in mouth pressure value P
2with the pressure value P of described low-pressure inlet
3meet P
1× P
3> K × P
2 2time, reduce the aperture of described secondary electron expansion valve, and
In the pressure value P of described exhaust outlet
1, described middle press-in mouth pressure value P
2with the pressure value P of described low-pressure inlet
3meet P
1× P
3< K × P
2 2time, increase the aperture of described secondary electron expansion valve, until the pressure value P of described exhaust outlet
1, described middle press-in mouth pressure value P
2with the pressure value P of described low-pressure inlet
3meet P
1× P
3=K × P
2 2, wherein, described K is the constant be between 0.5 to 1.
The control method of 15. double-stage compressor air-conditioner systems according to claim 14, is characterized in that, the step reducing the aperture of described secondary electron expansion valve is specially:
The aperture of described secondary electron expansion valve is progressively reduced according to predetermined speed.
The control method of 16. double-stage compressor air-conditioner systems according to claim 14, is characterized in that, also comprise:
In the pressure value P of described exhaust outlet
1, described middle press-in mouth pressure value P
2with the pressure value P of described low-pressure inlet
3meet P
1× P
3=K × P
2 2afterwards, the aperture of regulative mode to described secondary electron expansion valve according to described primary electron expansion valve regulates, after guaranteeing the aperture adjustment that described secondary electron expands, and the pressure value P of described exhaust outlet
1, described middle press-in mouth pressure value P
2with the pressure value P of described low-pressure inlet
3continue to meet P
1× P
3=K × P
2 2.
The control method of 17. double-stage compressor air-conditioner systems according to claim 16, is characterized in that, is specially according to the step that the aperture of regulative mode to described secondary electron expansion valve of described primary electron expansion valve regulates:
After the aperture increasing described primary electron expansion valve, interval increases the aperture of described secondary electron expansion valve after a predetermined time, and
After the aperture reducing described primary electron expansion valve, reduce the aperture of described secondary electron expansion valve through described predetermined time interval.
18., according to claim 11 to the control method of the double-stage compressor air-conditioner system according to any one of 17, is characterized in that, detect the step whether described double-stage compressor operate steadily and are specially:
Detect the running frequency of described double-stage compressor, when described running frequency miss the mark frequency, determine that described double-stage compressor off-duty is steady, and
When described running frequency reaches described target frequency, determine that described double-stage compressor operates steadily.
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| CN201410328350.0A CN104215001A (en) | 2014-07-10 | 2014-07-10 | Double-stage compressor air-conditioner system and control method thereof |
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| CN105928146A (en) * | 2016-04-29 | 2016-09-07 | 广东美的制冷设备有限公司 | Control method of cold and warm air conditioner |
| CN105928147A (en) * | 2016-04-29 | 2016-09-07 | 广东美的制冷设备有限公司 | Cold and warm air conditioner and control method thereof |
| CN106052177A (en) * | 2016-04-29 | 2016-10-26 | 广东美的制冷设备有限公司 | Refrigeration type air conditioner and control method thereof |
| CN105737425A (en) * | 2016-04-29 | 2016-07-06 | 广东美的制冷设备有限公司 | Control method for single-cold air conditioner |
| CN105928146B (en) * | 2016-04-29 | 2018-10-26 | 广东美的制冷设备有限公司 | The control method of heating and air conditioner |
| CN105783137B (en) * | 2016-04-29 | 2019-02-15 | 广东美的制冷设备有限公司 | The control method of heating and air conditioner |
| CN105890213B (en) * | 2016-04-29 | 2019-07-30 | 广东美的制冷设备有限公司 | The control method of heating and air conditioner |
| CN105783314B (en) * | 2016-04-29 | 2019-07-30 | 广东美的制冷设备有限公司 | Single cold type air conditioner and its control method |
| CN105928147B (en) * | 2016-04-29 | 2019-08-30 | 广东美的制冷设备有限公司 | Heating and air conditioner and its control method |
| CN106556188A (en) * | 2016-11-29 | 2017-04-05 | 珠海格力电器股份有限公司 | A kind of control method of air-conditioning system cold medium flux |
| CN106556188B (en) * | 2016-11-29 | 2019-10-01 | 珠海格力电器股份有限公司 | A kind of control method of air-conditioning system cold medium flux |
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