CN105485767A - Multi-split air conditioning system and control method - Google Patents

Abstract

The invention discloses a multi-split air conditioning system and a control method, wherein the system comprises: the condenser comprises a compressor, an evaporator, a condenser and a subcooler, wherein the reflux end of the subcooler refluxes to the compressor through a reflux pipeline; a supercooling pipeline and an enthalpy increasing pipeline which are connected in parallel are connected between the return pipeline and the compressor, wherein the supercooling pipeline is converged with an evaporator exhaust pipeline and then connected to a low-pressure air suction end of the compressor; and the enthalpy increasing pipeline is connected to the intermediate pressure suction end of the compressor; and the system also comprises a switching device for controlling the opening or closing of the supercooling pipeline and/or the enthalpy increasing pipeline. The scheme of the invention can overcome the defects of poor energy saving performance, low energy efficiency, poor user comfort level and the like in the prior art, and has the beneficial effects of good energy saving performance, high energy efficiency and good user comfort level.

Description

Multi-online air-conditioning system and control method

Technical field

The present invention relates to air-conditioning technical field, particularly, relate to a kind of multi-online air-conditioning system and control method.

Background technology

At present, the outer machine product of domestic large absolutely multi-connected machine, generally use common frequency conversion high pressure chest screw compressor, namely non-increasing enthalpy Scroll Inverter Compressor is used, compared with spray enthalpy frequency-changing cyclone compressor, there is the shortcoming with ability is low, low with ability efficiency frequently, high frequency delivery temperature high and low temperature operating mode heating capacity is low in its compressor.

In addition, existing country clearly proposes the requirement of " energy-saving and emission-reduction ", and legalization institutionalization, the level of competitiveness of the product of the relevant multi-connected machine Energy Efficiency Standard requirement of its country and the same industry is also improve with day; Therefore, to the efficiency level promoting multi-connected machine product, be also extremely urgent.

Current, the outer machine system schema of large absolutely multi-connected machine, generally use band economizer structure traditional like this---adopt freezed cold, heat uncontrolled control program, namely in cooling mode, open subcooler expansion valve 6 aperture, by the heat exchange effect of subcooler 7, what reduce condenser goes out pipe temperature, reaches the object improving degree of supercooling; But heat and do not carrying out any control, the signal of its system principle as shown in Figure 1.System shown in Fig. 1, comprises compressor 1, oil eliminator 2, cross valve 3, outdoor heat exchanger 4, throttle part 5; Subcooler expansion valve 6, subcooler 7, gas-liquid separator 8, minor valve 9 and large valve 10.

The purpose of design of this control mode mainly optimizes refrigeration, for the area of Mid-low latitude, as the area such as Central China, south China, can effectively improve system degree of supercooling, reduces harmful overheated impact caused.But for heating substantially without any advantage, because heating operations, interior machine becoming heat pump, needing to discharge heat of high temperature, can not condensation temperature be reduced, otherwise, the comfort level of user cannot be met; Therefore, for the shortcoming of this control mode, need to optimize it further, to meet high latitude area, as the heat pump ability of North China or even the Northeast, and seek to improve efficiency system schema further.

In prior art, there is the defects such as the low and users'comfort of energy saving difference, efficiency is poor.

Summary of the invention

The object of the invention is to, for above-mentioned defect, a kind of multi-online air-conditioning system and control method are proposed, to solve by controlling the switching of crossing cold pattern and increasing enthalpy pattern, better process is optimized to the ability in multi-connected machine cooling and warming process and efficiency, the problem of improving energy efficiency, reduction energy consumption.

One aspect of the present invention provides a kind of multi-online air-conditioning system, comprising: compressor, evaporimeter, condenser and subcooler, and the backflow end of described subcooler is back to described compressor by return line; Between described return line and described compressor, be also connected with super-cooling pipeline in parallel and increase enthalpy pipeline, after wherein said super-cooling pipeline and evaporator discharge pipeline converge, being connected to the low pressure air suction end of described compressor; And described increasing enthalpy pipeline is connected to the intermediate pressure suction end of described compressor; And described system also comprises the switching device shifter controlling described super-cooling pipeline and/or increasing enthalpy pipeline and open or close.

Wherein, described switching device shifter comprises the increasing enthalpy valve crossed low temperature valve and be arranged on described increasing enthalpy pipeline be arranged on described super-cooling pipeline.

Wherein, described switching device shifter comprises the three-way diverter valve be arranged between described return line and described super-cooling pipeline, described increasing enthalpy pipeline.

Wherein, described switching device shifter comprises the first cross valve, and four links of described first cross valve are connected with the low pressure air suction pipeline end of described compressor with described return line, described super-cooling pipeline, described increasing enthalpy pipeline respectively.Further, the backflow end of described subcooler be connected to described return line part also branch have gas bypass line, the other end of this gas bypass line is connected to the exhaust end of described compressor, and described gas bypass line is provided with gas bypass solenoid valve.

Wherein, described increasing enthalpy pipeline is also provided with and only allows fluid to flow to first check valve in described compressor direction from subcooler direction.

Wherein, the heat-releasing pipeline of described subcooler and the cold-producing medium upstream end of heat absorption pipeline are positioned at the same side of described subcooler; And the cold-producing medium outlet side of the heat-releasing pipeline of described subcooler and heat absorption pipeline is positioned at the same side of described subcooler.Further, the inlet end of the heat-releasing pipeline of described subcooler is provided with the first expansion valve.

Wherein, the exhaust end pipeline of described compressor is provided with the second cross valve, other three links of described second cross valve are connected respectively to described evaporimeter, described condenser and described super-cooling pipeline.

Wherein, when described evaporimeter is outdoor heat exchanger, described condenser is indoor heat exchanger; When described evaporimeter is indoor heat exchanger, described condenser is outdoor heat exchanger.Further, described outdoor heat exchanger is connected on the pipeline between described subcooler and is provided with the second expansion valve, and described second expansion valve is arranged in parallel allow cold-producing medium outdoor heat exchanger flow to the second check valve of described subcooler.

Match with said system, the present invention provides the control method of the system described in more than one on the other hand, comprise: use above-described multi-online air-conditioning system, according to the ruuning situation of reality, by the switching of described switching device shifter, described multi-online air-conditioning system is controlled accordingly.

Wherein, under the pattern of indoor heat exchanger refrigeration, as compressor frequency >=XHz and super cooling effect comes into force time, regulate described switching device shifter that super-cooling pipeline is opened, the closedown of described increasing enthalpy pipeline.

Wherein, to heat or under the pattern of freezing at indoor heat exchanger, when increasing enthalpy effect, regulate described switching device shifter that super-cooling pipeline is closed as compressor frequency >=YHz, described increasing enthalpy pipeline unlatching.

Wherein, as compressor frequency <X or YHz, or when crossing cold Pending The Entry Into Force or increasing enthalpy Pending The Entry Into Force, or regulate described switching device shifter that super-cooling pipeline and described increasing enthalpy pipeline are opened.

Wherein, when described system has gas bypass line and the first expansion valve, before the described switching device shifter of adjustment makes super-cooling pipeline and/or increases the unlatching of enthalpy pipeline, regulate power-off or the energising of the first cross valve and/or gas bypass solenoid valve, and/or regulate the first expansion valve, described subcooler is ventilated, when after ventilation preset duration, by the power-off of described gas bypass solenoid valve, more described super-cooling pipeline and/or increasing enthalpy pipeline are opened.

The solution of the present invention, utilize the characteristic of the ability high energy efficiency of spray enthalpy compressor, the lifting degree of supercooling characteristic of integrated economics device, passes through switching device shifter, both advantages are combined, thus reach cooling and warming improve efficiency, take into account the object that ultra low temperature heats hoisting power simultaneously.

Further, the solution of the present invention, crossing under cold pattern, retaining economizer to improve the characteristic of degree of supercooling under cryogenic conditions, simultaneously, under increasing enthalpy (such as: refrigeration increases enthalpy, heats increasing enthalpy) pattern, by spraying the heat exchange effect of enthalpy compressor and economizer, improving condenser enthalpy difference and promoting compressor work consuming, and then significantly adding heating capacity, the ability that then can effectively improve refrigeration, heat, this promotes comprehensive energy efficiency coefficients such as APF, IPLV and has very great help.

Thus, the solution of the present invention solves and utilizes the switching to crossing cold pattern and increasing enthalpy pattern to control, better process is optimized to the ability in multi-connected machine cooling and warming process and efficiency, the problem of improving energy efficiency, reduction energy consumption, thus, overcome the defect that energy saving in prior art is poor, efficiency is low and users'comfort is poor, realize good energy saving property, efficiency is high and users'comfort is good beneficial effect.

Other features and advantages of the present invention will be set forth in the following description, and, partly become apparent from description, or understand by implementing the present invention.

Below by drawings and Examples, technical scheme of the present invention is described in further detail.

Accompanying drawing explanation

Accompanying drawing is used to provide a further understanding of the present invention, and forms a part for description, together with embodiments of the present invention for explaining the present invention, is not construed as limiting the invention.In the accompanying drawings:

Fig. 1 is the structural representation of the control system of the outer machine of existing multi-connected machine;

Fig. 2 is the structural representation of an embodiment of multi-online air-conditioning system of the present invention; Wherein, a structural representation that () is multiple on-line system, b circulation p-h that () increases enthalpy for refrigeration schemes, c () is that the circulation p-h freezing cold schemes, d () schemes for heating the circulation p-h increasing enthalpy, p represents the corresponding pressure in respective cycle process, and h represents the corresponding enthalpy in respective cycle process;

Fig. 3 is the structural representation of an embodiment of dual-coil electromagnetic valve switching mechanism in system of the present invention;

Fig. 4 is the structural representation of an embodiment of three-way diverter valve switching mechanism in system of the present invention;

Fig. 5 is the structural representation of an embodiment of cross valve switching mechanism in system of the present invention.

By reference to the accompanying drawings, in the embodiment of the present invention, Reference numeral is as follows:

1-compressor; 2-oil eliminator; 3-cross valve; 4-outdoor heat exchanger; 5-throttle part; 6-subcooler expansion valve; 7-subcooler; 8-gas divides (i.e. gas-liquid separator); 9-minor valve; The large valve of 10-; 11-increases enthalpy valve; 12-crosses low temperature valve; 13-heats EVX; 14-subcooler EVX; 15-indoor heat exchanger; Machine EVX in 16-; 17-crosses cold magnetic valve; 18-increases enthalpy magnetic valve; 19-super-cooling pipeline; 20-increases enthalpy pipeline; 21-three-way diverter valve; 22-increases enthalpy cross valve; 23-gas bypass solenoid valve; 24-check valve.

Detailed description of the invention

For making the object, technical solutions and advantages of the present invention clearly, below in conjunction with the specific embodiment of the invention and corresponding accompanying drawing, technical solution of the present invention is clearly and completely described.Obviously, described embodiment is only the present invention's part embodiment, instead of whole embodiments.Based on the embodiment in the present invention, those of ordinary skill in the art, not making the every other embodiment obtained under creative work prerequisite, belong to the scope of protection of the invention.

According to embodiments of the invention, provide a kind of multi-online air-conditioning system.As Figure 2-Figure 5, this system at least comprises:

Compressor 1, evaporimeter, condenser and subcooler 7, the backflow end (such as: the d end in Fig. 2) of subcooler 7 is back to compressor 1 by return line; Between return line and compressor 1, be also connected with super-cooling pipeline 19 in parallel and increase enthalpy pipeline 20, wherein super-cooling pipeline 19 and evaporator discharge pipeline are connected to the low pressure air suction end of compressor 1 after converging; And increase the intermediate pressure suction end that enthalpy pipeline 20 is connected to compressor 1; And this system also comprises and controls super-cooling pipeline 19 and/or increase the switching device shifter that enthalpy pipeline 20 opens or closes.

Wherein, compressor 1, can preferred high-efficient compressor.Such as: preferably air injection enthalpy-increasing (EVI) compressor (also claiming to increase enthalpy screw compressor, spray enthalpy compressor) is as high-efficient compressor.By air injection enthalpy-increasing compressor, can the heating capacity of elevator system further.

Wherein, super-cooling pipeline 19 and increasing enthalpy pipeline 20 form synergy pipeline jointly.

Pass through switching device shifter, carry out controlling based on mode of operation switching to high-efficient compressor and economizer (or claiming subcooler), realize the cold pattern of mistake of multi-connected machine and increase the quick switching of enthalpy pattern (such as: refrigeration increases enthalpy pattern, heats increasing enthalpy pattern).By the switching of switching device shifter, realize being combined of high-efficient compressor (such as: air injection enthalpy-increasing compressor) and economizer (or claiming subcooler), the high heating capacity of high-efficient compressor and the height of economizer cold energy power of freezing is made to reach optimum combination, to improve ability and the efficiency of system simultaneously.

Wherein, economizer (economizer) is a kind of heat exchanger, absorbs heat thus that another part cold-producing medium must be is cold by cold-producing medium self throttling and evaporation.Such as: economizer, plate type heat exchanger can be comprised.

In one embodiment, as shown in Figure 2, switching device shifter comprises the low temperature valve 12 be excessively arranged on super-cooling pipeline 19 and the increasing enthalpy valve 11 be arranged on increasing enthalpy pipeline.

Such as: cross low temperature valve 12, by super-cooling pipeline 19, be connected to economizer (such as: outdoor heat exchanger 4); Increasing enthalpy valve 11, by increasing enthalpy pipeline 20, being connected to high-efficient compressor (example shown in Figure 2).

Such as: between the d crossing low temperature valve 12 the 3rd link and subcooler 7 that are connected to cross valve 3 hold, increase the d that enthalpy valve 11 is connected to subcooler 7 to hold between high-efficient compressor.

Thus, by bivalve (example shown in Figure 2, such as: cross low temperature valve 12 and increase enthalpy valve 11), heat under increasing enthalpy pattern, the system of Binding protein economizer, the enthalpy difference between evaporator inlet and outlet can be improved and increase the refrigerant flow of high-efficient compressor outlet and improve the acting of compression process, thus the heating capacity of system is significantly increased.Under refrigeration mode, cool further through subcooler 7 from condenser liquid out, add degree of supercooling, enthalpy difference between evaporator inlet and outlet increases, absorb heat in environment more indoor, and then reduce indoor temperature, reach the object improving refrigerating capacity.

Wherein, as shown in Figure 3, this is crossed low temperature valve 12 and comprised cold magnetic valve 17, and this increasing enthalpy valve 11 comprises increasing enthalpy magnetic valve 18.

Such as: cross cold magnetic valve 17 and be connected between subcooler 7 and the 3rd link of cross valve 3, increase enthalpy magnetic valve 18 and be connected between subcooler 7 and high-efficient compressor.

Such as: by the control action to dual-coil electromagnetic valve, under realizing refrigeration, heating mode, improve the object of efficiency, corresponding control logic is as follows:

1. under refrigeration mode, when compressor frequency >=the first predeterminated frequency value and super cooling effect comes into force time, cross cold magnetic valve 17 to be energized with increasing enthalpy magnetic valve 18 simultaneously, super-cooling pipeline 19 is opened (spraying to gas-liquid separator 8), subcooler expansion valve 6 is opened, by degree of supercooling control valve expansion aperture needed for system, and then under realizing refrigeration mode, the degree of supercooling of raising system and then realize the object of raising ability efficiency, simultaneously because super-cooling pipeline 19 leads to low-pressure side, what effectively prevent increasing enthalpy pipeline 20 check valve produces noise abnormal sound because of pressure fluctuation.

2. under heating mode, refrigeration mode, when compressor frequency >=the second predeterminated frequency value increases enthalpy effect, cold magnetic valve closes, and increases enthalpy solenoid valves, increases enthalpy pipeline and opens (spraying to compressor), subcooler expansion valve 6 is opened, by the aperture increasing the enthalpy degree of superheat and control expansion valve, realize heating, the raising of ability under refrigeration mode, and by increasing enthalpy ability ratio, reduce compressor frequency, and then reach the object putting forward effect;

3. when compressor frequency < first predeterminated frequency value or the second predeterminated frequency value or when crossing cold Pending The Entry Into Force or increasing enthalpy Pending The Entry Into Force, cross cold magnetic valve 17 and be energized with increasing enthalpy magnetic valve 18 simultaneously, now subcooler expansion valve 6 is in closed condition.

Thus, by bivalve (example shown in Figure 3, switching such as: cross cold magnetic valve 17 and increase enthalpy magnetic valve 18) controls, under crossing cold pattern, cross cold magnetic valve 17 all to open with increasing enthalpy magnetic valve 18, the system degree of supercooling under cryogenic conditions can be improved, and then efficiency increases, meanwhile, the abnormal sound increasing check valve (such as: the check valve be connected with compressor 1) on enthalpy pipeline 20 is prevented.Under increasing enthalpy pattern, cross low temperature valve 12 (such as: cross cold magnetic valve 17) and close, increase enthalpy valve 11 (such as: increase enthalpy magnetic valve 18) and open, by increasing the characteristic of the raising ability of enthalpy compressor, thus can compressor frequency be reduced, improving efficiency.

In one embodiment, as shown in Figure 4, switching device shifter comprises and is arranged on return line and super-cooling pipeline 19, increases three-way diverter valve 21 between enthalpy pipeline 20.

Such as: first link (such as: A mouth) of three-way diverter valve 21, by super-cooling pipeline 19, is connected to the side of economizer (such as: outdoor heat exchanger 4); Second link (such as: B mouth), by super-cooling pipeline 19, is connected to the opposite side of economizer (such as: outdoor heat exchanger 4); 3rd link (such as: C mouth), by increasing enthalpy pipeline 20, is connected to high-efficient compressor (example shown in Figure 4).

Such as: the first link of three-way diverter valve 21 is connected to subcooler 7, the second link is connected to the 3rd link of cross valve 3, and the 3rd link is connected to high-efficient compressor.

Such as: by the commutation effect to three-way diverter valve 21, under realizing refrigeration, heating mode, improve the object of efficiency, corresponding control logic is as follows:

1. in cooling mode, when compressor frequency >=the first predeterminated frequency value and super cooling effect comes into force time, three-way diverter valve 21 is in AB energising, and (A and B communicates, C closes), super-cooling pipeline 19 logical (spraying to gas-liquid separator), subcooler expansion valve 6 is opened, subcooler expansion valve opening is controlled by system degree of supercooling, and then under realizing refrigeration mode, improve the degree of supercooling of system, and then realize the object of raising ability efficiency.

2. under heating mode, refrigeration mode, when compressor frequency >=the second predeterminated frequency value and when increasing enthalpy effect, three-way diverter valve 21 is in AC energising (A and C communicates, B closedown), increase enthalpy pipeline 20 logical (spraying to compressor), subcooler expansion valve 6 is opened, and by the aperture increasing the enthalpy degree of superheat and control subcooler expansion valve 6, realizes heating, under refrigeration mode, the raising of ability, and by increasing enthalpy ability ratio, reducing compressor frequency, and then reaching the object putting forward effect.

3. when compressor frequency < first predeterminated frequency value or the second predeterminated frequency value or when crossing cold Pending The Entry Into Force or increasing enthalpy Pending The Entry Into Force, three-way diverter valve recovers AB energising, and now subcooler expansion valve 6 is in closed condition.

Thus, controlled by the switching of three-way diverter valve 21, under crossing cold pattern, the AB of three-way diverter valve 21 passes to and opens super-cooling pipeline, the C of three-way diverter valve 21 shuts to turn off and increases enthalpy pipeline 20, can improve the system degree of supercooling under cryogenic conditions, and then system energy efficiency increases.Under increasing enthalpy pattern, by the commutation effect of three-way diverter valve 21, the AC of three-way diverter valve 21 passes to open and increases enthalpy pipeline 20, the B of three-way diverter valve 21 shuts to turn off super-cooling pipeline 19, by the characteristic of the raising ability of high-efficient compressor (such as: increase enthalpy compressor), can compressor frequency be reduced, and then improve system energy efficiency.

In one embodiment, as shown in Figure 5, switching device shifter comprises the first cross valve, and four links of the first cross valve are connected with the low pressure air suction pipeline end of compressor with return line, super-cooling pipeline, increasing enthalpy pipeline respectively.

Wherein, this first cross valve, is preferably and increases enthalpy cross valve 22.

In one example in which, the backflow end of subcooler 7 be connected to return line part also branch have gas bypass line, the other end of this gas bypass line is connected to the exhaust end of compressor 1, and gas bypass line is provided with gas bypass solenoid valve 23.Wherein, the effect of gas bypass line is when system pressure is too high, and gas bypass solenoid valve is opened, and is unloaded by high side gas and flows to area of low pressure, plays the effect of pressure release.

In one embodiment, as Figure 2-Figure 5, increasing enthalpy pipeline 20 is also provided with only allows fluid to flow to first check valve (such as: check valve 24) in compressor direction from subcooler direction, controls with the switching realized more reliably between cold pattern and increasing enthalpy pattern.

Such as: the first link (such as: S mouth) increasing enthalpy cross valve 22, by increasing enthalpy pipeline 20, the side of high-efficient compressor is connected to; Second link (such as: E mouth), by super-cooling pipeline 19, is connected to the side of economizer; 3rd link (such as: D mouth), by gas bypass solenoid valve 23, is connected to economizer; 4th link (such as: C mouth), by check valve 24, is connected to high-efficient compressor (example shown in Figure 5).

Wherein, the first link increasing enthalpy cross valve 22 is connected to gas-liquid separator 8, second link is connected to the 3rd link of cross valve 3,3rd link is connected to subcooler 7 and is connected to oil eliminator 2 through gas bypass solenoid valve 23, and the 4th link is connected to high-efficient compressor by check valve 24.

In one example in which, as Figure 2-Figure 5, the inlet end of the heat-releasing pipeline of subcooler 7 is provided with the first expansion valve (such as: subcooler expansion valve 6 or subcooler EVX14).

In one example in which, as Figure 2-Figure 5, super-cooling pipeline 19 is connected between compressor 1 low pressure air suction end and is also provided with gas-liquid separator 8.

In one embodiment, as Figure 2-Figure 5, the exhaust end pipeline of compressor 1 is provided with the second cross valve (such as: cross valve 3), other three links of the second cross valve are connected respectively to evaporimeter, condenser and super-cooling pipeline 19.

Such as: the first link of cross valve 3 is connected to high-efficient compressor (such as: compressor 1), and the second link is connected to subcooler 7 after outdoor heat exchanger 4, and the 3rd link is connected to gas-liquid separator 8; Outdoor heat exchanger 4 is also connected to subcooler 7, and high-efficient compressor is also connected to gas-liquid separator 8; Switching device shifter, is connected to the 3rd link and the subcooler 7 of cross valve 3 by super-cooling pipeline 19, and is connected to high-efficient compressor (such as: compressor 1), see the example shown in Fig. 2-Fig. 5 by increasing enthalpy pipeline 20.

Wherein, the 4th link of cross valve 3 is connected to subcooler 7 (example shown in Figure 2) through indoor heat exchanger 15.

Thus, by the second cross valve, can be easier and realize multi-gang air-conditioner more reliably and crossing work that is cold or that increase under enthalpy pattern.

In one embodiment, when evaporimeter is outdoor heat exchanger 4, condenser is indoor heat exchanger 15; When evaporimeter is indoor heat exchanger 15, condenser is outdoor heat exchanger 4 (example shown in Figure 2).

Such as: see the example shown in Fig. 3-Fig. 5, corresponding heat exchanger (such as: indoor heat exchanger 15) can be connected between minor valve 9 and large valve 10.

Wherein, outdoor heat exchanger 4 and indoor heat exchanger 15, can mate supplemental heat rejected facility (such as: fan).

In one example in which, as Figure 2-Figure 5, outdoor heat exchanger 4 is connected to and the pipeline between subcooler 7 is provided with the second expansion valve (such as: throttle part 5 or heat EVX13), and the second expansion valve is arranged in parallel allow cold-producing medium outdoor heat exchanger flow to second check valve (such as: the check valve in parallel with heating EVX13) of subcooler.

Thus, by the Flow-rate adjustment of the first expansion valve and/or the second expansion valve, can control better crossing value that is cold and/or that increase enthalpy, with ability that is more stable, elevator system more reliably and efficiency.

In one example in which, the output of compressor 1 is also provided with oil eliminator 2 (example see shown in Fig. 3-Fig. 5).

Such as: high-efficient compressor (such as: compressor 1) is connected to the first link of cross valve 3 through oil eliminator 2; Large valve 10 is connected to the 4th link of cross valve 3, and minor valve 9 is connected to subcooler 7 (example see shown in Fig. 3, Fig. 4 and Fig. 5).Wherein, oil eliminator 2 is also connected to the 3rd link (example see shown in Fig. 3, Fig. 4) of cross valve 3.

Such as: between oil eliminator 2 and the 3rd link of cross valve 3 can also the throttle capillary tube that arranges of connected electromagnetic valve and mating with this magnetic valve (see the example shown in Fig. 3, Fig. 4, zigzag broken line in corresponding figure represents throttle capillary tube), for preventing the refrigerant of large discharge from flowing into next stage, thus do not reduce ability.

Such as: allow oil eliminator 2 to export the 3rd check valve (example see shown in Fig. 3, Fig. 4, Fig. 5) that gas unidirectional flows to condenser or evaporimeter can also be connected between oil eliminator 2 and the first link of cross valve 3.

Thus, heat under increasing enthalpy pattern, by high-efficient compressor and corresponding economizer, the enthalpy difference between evaporator inlet and outlet can be improved and increase the refrigerant flow of synergy compressor outlet and improve the acting of compression process, thus the heating capacity of system is significantly increased.

And under refrigeration increasing enthalpy pattern or excessively cold pattern, by corresponding economizer, cool further from condenser liquid out through subcooler 7, add degree of supercooling, enthalpy difference between evaporator inlet and outlet increases, absorb heat in environment more indoor, and then reduce indoor temperature, reach the object improving refrigerating capacity.Refrigeration uses high-efficient compressor simultaneously, can promote heat transfer effect under increasing enthalpy pattern.

In one example in which, between gas bypass solenoid valve 23 and oil eliminator 2, be also connected with throttle capillary tube, think that the control action of gas bypass solenoid valve 23 provides auxiliary and protective effect more reliably.

Such as: between the second link increasing enthalpy cross valve 22 and the 3rd link of cross valve 3, be also connected with throttling capillary, to increase the reliability that enthalpy cross valve 22 controls.

Such as: by the commutation and the bypass action that increase enthalpy cross valve 22, under realizing refrigeration, heating mode, improve the object of efficiency; Corresponding control logic is as follows:

1. in cooling mode, when compressor frequency >=the first predeterminated frequency value and super cooling effect comes into force time, increase the power-off of enthalpy cross valve 22, gas bypass solenoid valve 23 powers on simultaneously, subcooler expansion valve 6 does not leave, when (preventing cross valve from collaborating) after duration of ventilation >=preset duration, gas bypass solenoid valve 23 power-off, super-cooling pipeline 19 is opened (spraying to gas-liquid separator), subcooler expansion valve 6 is opened, by degree of supercooling control valve expansion aperture needed for system, and then under realizing refrigeration mode, the degree of supercooling of raising system, and then realize the object of raising ability efficiency, simultaneously, because S and the C increasing enthalpy cross valve 22 is connected low-pressure side, also prevent the abnormal sound produced because pressure reduction is unstable of the check valve 24 increasing enthalpy pipeline 20.

2. at heating mode, under refrigeration mode, when compressor frequency >=the second predeterminated frequency value (such as: YHz, Y is real number) and when increasing enthalpy effect, increase enthalpy cross valve 22, the other electromagnetism energising 23 of gas, subcooler expansion valve 6 does not leave, when (guaranteeing to increase enthalpy cross valve 22 to commutate completely) gas bypass solenoid valve 23 power-off after duration of ventilation >=preset duration, increase enthalpy pipeline 20 to open (spraying to compressor), subcooler expansion valve 6 is opened, by the aperture increasing enthalpy degree of superheat control expansion valve, realization heats, the raising of ability under refrigeration mode, and by increasing enthalpy ability ratio, reduce compressor frequency, and then reach the object putting forward effect.

3. when compressor frequency < first predeterminated frequency value or the second predeterminated frequency value [such as: X (Y) Hz] or when crossing cold Pending The Entry Into Force or increasing enthalpy Pending The Entry Into Force, four way solenoid valve 22 power-off, and closed condition is transferred to by subcooler expansion valve 6.

4., when gas bypass solenoid valve 23 controls to come into force, synergy cross valve (such as: four way solenoid valve 22) power-off at once, closed condition is transferred to by subcooler expansion valve 6 simultaneously, after gas bypass solenoid valve controls inefficacy, then presses demand modeling.

Thus, controlled by the switching increasing enthalpy cross valve 22, under crossing cold pattern, increase the power-off of enthalpy cross valve 22, super-cooling pipeline 19 is opened, and increases enthalpy pipeline 20 and closes, can improve the system degree of supercooling under cryogenic conditions, and then system energy efficiency increases; Meanwhile, because S and the C increasing enthalpy cross valve 22 is connected low-pressure side, what effectively can prevent from increasing enthalpy pipeline 20 check valve 24 produces noise abnormal sound because of pressure fluctuation.Under increasing enthalpy pattern, increase enthalpy cross valve 22 and be energized, increase enthalpy pipeline 20 and open, super-cooling pipeline 19 closes, and by the characteristic of the raising ability of high-efficient compressor, can reduce compressor frequency, improves system energy efficiency.

In the multi-connected machine product of Present Domestic, general all in the scheme using common frequency-changing cyclone compressor and band economizer, this scheme is multi-joint with conventional digital, have certain superiority compared with fixed-frequency multi-gang machine, but, this scheme has certain limitation, be embodied in, refrigeration can raising degree of supercooling to a certain degree, and then raising refrigerating capacity, but under heating mode, the advantage of economizer (or subcooler) does not exist, because, under heating mode, economizer does not have the effect of hoisting power or efficiency.

And the technical scheme of the present embodiment, in cooling mode, retain the characteristic that economizer improves degree of supercooling, simultaneously, or in a heating mode, by spraying the heat exchange effect of enthalpy compressor and economizer, improve condenser enthalpy difference and promote compressor work consuming, and then significantly add heating capacity, then effectively can improve refrigeration, the ability heated, this can to APF (annualperformancefactor, Annual performance factor, in refrigeration season and heating season, unit carry out the heat that removes indoor when cooling/heating runs and to the heat summation of indoor feeding and the ratio of electricity summation of same period internal consumption), IPLV (integratedpartloadvalue, Integrated part-load value, the part-load efficiency index by a single numeric representation air conditioning handpiece Water Chilling Units) etc. comprehensive energy efficiency coefficient promote have very great help.

According to embodiments of the invention, additionally provide a kind of control method corresponding to multi-online air-conditioning system.The method at least comprises:

Use above multi-online air-conditioning system, according to the ruuning situation of reality, by the switching of switching device shifter, multi-online air-conditioning system is controlled accordingly.

Thus, pass through switching device shifter, to high-efficient compressor (such as: compressor 1, can preferred air injection enthalpy-increasing compressor) and economizer (such as: outdoor heat exchanger 4 and/or indoor heat exchanger 15) carry out controlling with switching based on mode of operation, realize the cold pattern of mistake of multi-connected machine and increase the quick switching of enthalpy pattern.

In one embodiment, under the pattern of indoor heat exchanger refrigeration, as compressor frequency >=XHz and super cooling effect comes into force time, regulate switching device shifter that super-cooling pipeline is opened, increase the closedown of enthalpy pipeline.EVI system has three kinds of control programs: freezed cold (namely jet point spray gas separator); Refrigeration increases enthalpy (spray compressor), heats increasing enthalpy (spray compressor), belongs to the relation that system model is selected between three.Wherein, under the condition that super cooling effect comes into force, the scheme of may be used for freezing cold (namely jet point spray gas separator).Preferably, the value of X is not less than 40Hz, when compressor frequency is lower than crossing cold poor effect during 40Hz.

Such as: as Fig. 2, shown in Fig. 3, under refrigeration mode, when compressor frequency >=the first predeterminated frequency value and super cooling effect comes into force time, cross low temperature valve (such as: cross cold magnetic valve 17) to be energized with increasing enthalpy valve (such as: increase enthalpy magnetic valve 18) simultaneously, super-cooling pipeline 19 is opened (spraying to gas-liquid separator 8), subcooler expansion valve 6 is opened, by degree of supercooling control valve expansion aperture needed for system, and then under realizing refrigeration mode, the degree of supercooling of raising system, and then realize the object of raising ability efficiency, simultaneously because super-cooling pipeline 19 leads to low-pressure side, what effectively prevent increasing enthalpy pipeline 20 check valve produces noise abnormal sound because of pressure fluctuation.

Such as: as shown in Figure 4, under refrigeration mode, when compressor frequency >=the first predeterminated frequency value and super cooling effect comes into force time, three-way diverter valve 21 is in AB energising (A and B communicates, C closedown), super-cooling pipeline 19 logical (spraying to gas-liquid separator), subcooler expansion valve 6 is opened, and controls valve expansion aperture by system degree of supercooling, and then under realizing refrigeration mode, the degree of supercooling of raising system, and then the object realizing raising ability efficiency.

Such as: as shown in Figure 5, in cooling mode, when compressor frequency >=the first predeterminated frequency value and super cooling effect comes into force time, increase the power-off of enthalpy cross valve 22, gas bypass solenoid valve 23 powers on simultaneously, subcooler expansion valve 6 does not leave, when (preventing cross valve from collaborating) after duration of ventilation >=preset duration, gas bypass solenoid valve 23 power-off, super-cooling pipeline 19 is opened (spraying to gas-liquid separator), subcooler expansion valve 6 is opened, by degree of supercooling control valve expansion aperture needed for system, and then under realizing refrigeration mode, the degree of supercooling of raising system, and then realize the object of raising ability efficiency, simultaneously, because S and the C increasing enthalpy cross valve 22 is connected low-pressure side, also prevent the abnormal sound produced because pressure reduction is unstable of the check valve 24 increasing enthalpy pipeline 20.

In one embodiment, to heat or under the pattern of freezing at indoor heat exchanger, when increasing enthalpy effect (as controlled condition), regulate switching device shifter that super-cooling pipeline is closed as compressor frequency >=YHz, increase the unlatching of enthalpy pipeline.In the Three models of EVI system controls, refrigeration increases enthalpy and belongs to special pattern, forces cool condition just can use.

Such as: as shown in Figure 2 and Figure 3, in a heating mode, when compressor frequency >=the second predeterminated frequency value increases enthalpy effect, cross cold magnetic valve and close, increase enthalpy solenoid valves, increase enthalpy pipeline and open (spraying to compressor), subcooler expansion valve 6 is opened, by the aperture increasing enthalpy degree of superheat control expansion valve, realize heating, the raising of ability under refrigeration mode, and by increasing enthalpy ability ratio, reducing compressor frequency, and then reaching the object putting forward effect.

Such as: as shown in Figure 4, in a heating mode, when compressor frequency >=the second predeterminated frequency value and increase enthalpy effect time, three-way diverter valve 21 is in AC energising, and (A and C communicates, B closes), increase enthalpy pipeline 20 logical (spraying to compressor), subcooler expansion valve 6 is opened, by the aperture increasing enthalpy degree of superheat control subcooler expansion valve 6, realization heats, under refrigeration mode, the raising of ability, and by increasing enthalpy ability ratio, reduce compressor frequency, and then reach the object putting forward effect.

Such as: as shown in Figure 5, in a heating mode, when compressor frequency >=the second predeterminated frequency value (such as: YHz, Y is real number) and when increasing enthalpy effect, increase enthalpy cross valve 22, the other electromagnetism energising 23 of gas, subcooler expansion valve 6 does not leave, when (guaranteeing to increase enthalpy cross valve 22 to commutate completely) gas bypass solenoid valve 23 power-off after duration of ventilation >=preset duration, increase enthalpy pipeline 20 to open (spraying to compressor), subcooler expansion valve 6 is opened, by the aperture increasing enthalpy degree of superheat control expansion valve, realization heats, the raising of ability under refrigeration mode, and by increasing enthalpy ability ratio, reduce compressor frequency, and then reach the object putting forward effect.

In one embodiment, as compressor frequency <X or YHz, or when crossing cold Pending The Entry Into Force or increasing enthalpy Pending The Entry Into Force (as controlled condition), or regulate switching device shifter to make super-cooling pipeline and increase the unlatching of enthalpy pipeline.

Such as: as shown in Figure 2 and Figure 3, when compressor frequency < first predeterminated frequency value or the second predeterminated frequency value or when crossing cold Pending The Entry Into Force or increasing enthalpy Pending The Entry Into Force, cross cold magnetic valve 17 to be energized with increasing enthalpy magnetic valve 18, now subcooler expansion valve 6 is in closed condition simultaneously.

Such as: as shown in Figure 4, when compressor frequency < first predeterminated frequency value or the second predeterminated frequency value or when crossing cold Pending The Entry Into Force or increasing enthalpy Pending The Entry Into Force, three-way diverter valve recovers AB energising, and now subcooler expansion valve is in closed condition.

Such as: as shown in Figure 5, when compressor frequency < first predeterminated frequency value or the second predeterminated frequency value [such as: X (Y) Hz] or when crossing cold Pending The Entry Into Force or increasing enthalpy Pending The Entry Into Force, four way solenoid valve 22 power-off, and closed condition is transferred to by subcooler expansion valve 6.

Wherein, when gas bypass solenoid valve 23 controls to come into force, synergy cross valve (such as: four way solenoid valve 22) power-off at once, closed condition is transferred to by subcooler expansion valve 6 simultaneously, after gas bypass solenoid valve controls inefficacy, then presses demand modeling.

In a concrete example, as shown in Figure 2 and Figure 3, when switching device shifter can comprise low temperature valve (such as: cross low temperature valve 12, cross cold magnetic valve 17 etc.) and increase enthalpy valve (such as: increase enthalpy valve 11, increase enthalpy magnetic valve 18 etc.), its control mode comprises: under crossing cold pattern, cross low temperature valve and increase enthalpy valve and all open, be increased to default degree of supercooling to make the system degree of supercooling under cryogenic conditions; Under increasing enthalpy pattern, crossing low temperature valve pass and increase enthalpy valve and open, by increasing enthalpy compressor, increasing to default enthalpy to make the system enthalpy under increasing enthalpy condition.By the control action to bivalve, under realizing refrigeration, heating mode, improve the object of efficiency.

In a concrete example, as shown in Figure 4, when switching device shifter can comprise three-way diverter valve 21, its control mode comprises: under crossing cold pattern, first link to the second link of three-way diverter valve 21 leads to and the 3rd link is shut, super-cooling pipeline 19 is logical, increasing enthalpy pipeline 20 turns off, and is increased to default degree of supercooling to make the system degree of supercooling under cryogenic conditions; Under increasing enthalpy pattern, by the commutation effect of three-way diverter valve 21, first link to the 3rd link of three-way diverter valve 21 leads to and the second link is shut, increasing enthalpy pipeline 20 is logical, super-cooling pipeline 19 turns off, by high-efficient compressor (such as: air injection enthalpy-increasing compressor), increase to default enthalpy to make the system enthalpy under increasing enthalpy condition.By the commutation effect to three-way diverter valve 21, under realizing refrigeration, heating mode, improve the object of efficiency.

In a concrete example, as shown in Figure 5, when switching device shifter comprises increasing enthalpy cross valve 22, gas bypass solenoid valve 23 and check valve 24, its control mode comprises: under crossing cold pattern, when gas bypass solenoid valve 23 controls to come into force, increase the power-off of enthalpy cross valve 22, super-cooling pipeline 19 is opened, increase enthalpy pipeline 20 turns off, and is increased to default degree of supercooling to make the system degree of supercooling under cryogenic conditions; Meanwhile, check valve 24 abnormal sound is prevented; Under increasing enthalpy pattern, increasing enthalpy cross valve 22 is energized, and increasing enthalpy pipeline 20 is opened, super-cooling pipeline 19 turns off, and by the characteristic of the raising ability of synergy compressor, increases to default enthalpy to make the system enthalpy under increasing enthalpy condition.By to the commutation and the bypass action that increase enthalpy cross valve 22, under realizing refrigeration, heating mode, improve the object of efficiency.

Thus, utilize the characteristic of the ability high energy efficiency of spray enthalpy compressor, in conjunction with the advantage function of original economizer, by switching device shifter, both advantages are combined, thus reach the object that cooling and warming improves efficiency, ultra low temperature heats hoisting power.

In one embodiment, when system has gas bypass line and the first expansion valve, before adjustment switching device shifter makes super-cooling pipeline and/or increases the unlatching of enthalpy pipeline, regulate the power-off or energising that increase enthalpy cross valve and/or gas bypass solenoid valve, and/or regulate the first expansion valve, subcooler is ventilated, when after ventilation preset duration, by the power-off of gas bypass solenoid valve, then super-cooling pipeline and/or increasing enthalpy pipeline are opened.Wherein, ventilation preset duration is the successful commutation in order to ensure increasing enthalpy cross valve.

To sum up, spray enthalpy compressor is used; Use plate type heat exchanger as the economizer of system, and use electric expansion valve as adjust flux mechanism; By any one commutation effect pattern in dual-coil electromagnetic valve switch, three-way switch valve and four-way change-over valve as switching device shifter, realize cold pattern, increase the quick switching of enthalpy pattern, and then carrying of high-efficient compressor and economizer can be proposed effect effect and is combined, thus make ability, the lifting of efficiency reaches higher level.

In a preferred embodiment, can increase that enthalpy screw compressor (such as: can as high-efficient compressor) mainly improves heating capacity (hereinafter referred to as scheme one) by adopting, the cold or double mode increasing enthalpy that freezed (such as: refrigeration increase enthalpy pattern and heat increase enthalpy pattern)+band economizer mainly improves refrigerating capacity (hereinafter referred to as scheme two) and the system schema of new and effective spray enthalpy frequency-changing cyclone compressor (such as: can as high-efficient compressor)+scheme two, can give prominence to the problem solving and improve system capability and improve system energy efficiency.Specific as follows:

(i) system capability is improved;

Scheme one, employing increase the control mode of enthalpy screw compressor, and mainly improve heating capacity, its general principle is as follows:

Heat under increasing enthalpy pattern, the system of Binding protein economizer, the enthalpy difference between evaporator inlet and outlet can be improved and increase the refrigerant flow of high-efficient compressor outlet and improve the acting of compression process, thus the heating capacity of system is significantly increased.

Adopt the control mode of the cold or double mode increasing enthalpy+band economizer that freezed, mainly improve refrigerating capacity, its general principle is as follows:

Under refrigeration mode, cool further through subcooler from condenser liquid out, add degree of supercooling, enthalpy difference between evaporator inlet and outlet increases, absorb heat in environment more indoor, and then reduce indoor temperature, reach the object improving refrigerating capacity.

For above principle and test measured result, because of effectively improving heating capacity, therefore spray enthalpy compressor can be applied to completely and ultralowly heat in environment, can improve the ability of nearly 30% than traditional compressor.

Example shown in Figure 2, the scheme of this raising system capability, comprising: compressor (such as: high-efficient compressor) 1, cross valve 3, outdoor heat exchanger 4, subcooler 7, gas-liquid separator 8, increase enthalpy valve 11, cross low temperature valve 12, heat EVX13, subcooler EVX14, indoor heat exchanger 15, interior machine EVX16.Wherein, carry effect pipeline to be made up of super-cooling pipeline 19 and increasing enthalpy pipeline 20.

Wherein, the first link of cross valve 3 is connected to high-efficient compressor, and the second link is connected to subcooler 7 after outdoor heat exchanger 15, and the 3rd link is connected to gas-liquid separator 8; Outdoor heat exchanger 16 is also connected to subcooler 7, and high-efficient compressor is also connected to gas-liquid separator 8; Switching device shifter, is connected to the 3rd link and the subcooler 7 of cross valve 3 by super-cooling pipeline 19, and is connected to high-efficient compressor by increasing enthalpy pipeline 20, and the 4th link of cross valve 3 is connected to subcooler 7 through indoor heat exchanger 15.

(ii) system energy efficiency is improved:

Because respective capabilities increases, under the prerequisite meeting same capabilities, effectively can reduce compressor frequency, thus reduce the power stage of compressor, and then corresponding efficiency promotes to some extent.

In one example in which, this device, comprises a kind of system schema using dual-coil electromagnetic valve to improve efficiency.

Example shown in Figure 3, this dual-coil electromagnetic valve improves the system schema of efficiency, comprising: high-efficient compressor (such as: air injection enthalpy-increasing compressor) 1, oil eliminator 2, cross valve 3, outdoor heat exchanger 4, throttle part 5, subcooler expansion valve 6, subcooler 7, gas-liquid separator 8, minor valve 9, large valve 10, cross cold magnetic valve 17, increase enthalpy magnetic valve 18 and carry effect pipeline.Wherein, carry effect pipeline to be made up of super-cooling pipeline 19 and increasing enthalpy pipeline 20.

Under crossing cold pattern, cross cold magnetic valve 17 and all open with increasing enthalpy magnetic valve 18, thus improve the system degree of supercooling under cryogenic conditions, and then efficiency increases, meanwhile, prevent the abnormal sound increasing check valve on enthalpy pipeline 20.

Under increasing enthalpy pattern, cross cold magnetic valve and close, increase enthalpy magnetic valve and open, by increasing the characteristic of the raising ability of enthalpy compressor, thus can compressor frequency be reduced, improving efficiency.

This dual-coil electromagnetic valve improves the control method of the system schema of efficiency: by the control action to dual-coil electromagnetic valve, and under realizing refrigeration, heating mode, improve the object of efficiency, corresponding control logic is as follows:

1. in cooling mode, when compressor frequency >=the first predeterminated frequency value (such as: XHz, X is real number) and super cooling effect comes into force time, cross cold magnetic valve 17 to be energized with increasing enthalpy magnetic valve 18 simultaneously, super-cooling pipeline 19 is opened (spraying to gas-liquid separator 8), subcooler expansion valve 6 is opened, by system degree of supercooling control valve expansion aperture, and then under realizing refrigeration mode, the degree of supercooling of raising system, and then realize the object of raising ability efficiency, simultaneously because super-cooling pipeline 19 leads to low-pressure side, what effectively prevent increasing enthalpy pipeline 20 check valve produces noise abnormal sound because of pressure fluctuation.

2. under heating mode, refrigeration mode, when compressor frequency >=the second predeterminated frequency value (such as: YHz, Y are real number) increases enthalpy effect, cold magnetic valve closes, increase enthalpy solenoid valves, increase enthalpy pipeline and open (spraying to compressor), subcooler expansion valve 6 is opened, by the aperture increasing enthalpy degree of superheat control expansion valve, realize heating, the raising of ability under refrigeration mode, and by increasing enthalpy ability ratio, reducing compressor frequency, and then reaching the object putting forward effect;

3. when compressor frequency < first predeterminated frequency value or the second predeterminated frequency value [such as: X (Y) Hz] or when crossing cold Pending The Entry Into Force or increasing enthalpy Pending The Entry Into Force, cross cold magnetic valve 17 to be energized with increasing enthalpy magnetic valve 18, now subcooler expansion valve 6 is in closed condition simultaneously.

In one example in which, switching device shifter, comprises a kind of system schema using three-way diverter valve to improve efficiency.

Example shown in Figure 4, this use three-way diverter valve improves the system schema of efficiency, comprising: air injection enthalpy-increasing (EVI) compressor 1, oil eliminator 2, cross valve 3, outdoor heat exchanger 4, throttle part 5, subcooler expansion valve 6, subcooler 7, gas-liquid separator 8, minor valve 9, large valve 10, three-way diverter valve 21 and carry effect pipeline.

Wherein, carry effect pipeline to be made up of super-cooling pipeline 19 and increasing enthalpy pipeline 20.

Under crossing cold pattern, super-cooling pipeline 19 logical (namely the AB of three-way diverter valve 21 leads to), closes and increase enthalpy pipeline 20 (namely the C of three-way diverter valve 21 shuts), thus improve the system degree of supercooling under cryogenic conditions, and then efficiency increases.

Under increasing enthalpy pattern, by the commutation effect of triple valve (such as: three-way diverter valve 21), increase enthalpy pipeline 20 logical (namely the AC of three-way diverter valve 21 leads to), close super-cooling pipeline 19 (namely the B of three-way diverter valve 21 shuts), by increasing the characteristic of the raising ability of enthalpy compressor, thus compressor frequency can be reduced, and then improve efficiency.

This use three-way diverter valve improves the control method of the system schema of efficiency: by the commutation effect to three-way diverter valve 21, and under realizing refrigeration, heating mode, improve the object of efficiency, corresponding control logic is as follows:

1. in cooling mode, when compressor frequency >=the first predeterminated frequency value (such as: XHz, X is real number) and super cooling effect comes into force time, three-way diverter valve 21 is in AB energising (A and B communicates, C closedown), super-cooling pipeline 19 logical (spraying to gas-liquid separator), subcooler expansion valve 6 is opened, and controls valve expansion aperture by system degree of supercooling, and then under realizing refrigeration mode, the degree of supercooling of raising system, and then the object realizing raising ability efficiency.

2. under heating mode, refrigeration mode, when compressor frequency >=the second predeterminated frequency value (such as: YHz, Y is real number) and when increasing enthalpy effect, three-way diverter valve 21 is in AC energising, and (A and C communicates, B closes), increase enthalpy pipeline 20 logical (spraying to compressor), subcooler expansion valve 6 is opened, by the aperture increasing enthalpy degree of superheat control subcooler expansion valve 6, realization heats, under refrigeration mode, the raising of ability, and by increasing enthalpy ability ratio, reduce compressor frequency, and then reach the object putting forward effect.

3. when compressor frequency < first predeterminated frequency value or the second predeterminated frequency value [such as: X (Y) Hz] or when crossing cold Pending The Entry Into Force or increasing enthalpy Pending The Entry Into Force, three-way diverter valve recovers AB energising, and now subcooler expansion valve is in closed condition.

In an example, switching device shifter, comprises a kind of system schema using cross valve to improve efficiency.

Example shown in Figure 5, this use cross valve improves the system schema of efficiency, comprising: air injection enthalpy-increasing compressor 1, oil eliminator 2, cross valve 3, outdoor heat exchanger 4, throttle part 5, subcooler expansion valve 6, subcooler 7, gas-liquid separator 8, minor valve 9, large valve 10, increase enthalpy cross valve 22, gas bypass solenoid valve 23, check valve 24 and carry effect pipeline.

Wherein, carry effect pipeline to be made up of super-cooling pipeline 19 and increasing enthalpy pipeline 20.

Under crossing cold pattern, increase the power-off of enthalpy cross valve 22, super-cooling pipeline 19 is opened, increase enthalpy pipeline 20 to close, thus the system degree of supercooling under raising cryogenic conditions, and then efficiency increases, simultaneously, because S and the C increasing enthalpy cross valve 22 is connected low-pressure side, what also effectively prevent from increasing enthalpy pipeline 20 check valve 24 produces noise abnormal sound because of pressure fluctuation.

Under increasing enthalpy pattern, increase enthalpy cross valve 22 and be energized, increase enthalpy pipeline 20 and open, super-cooling pipeline 19 closes, and by increasing the characteristic of the raising ability of enthalpy compressor 1, thus can reduce compressor frequency, improving efficiency.

This use cross valve improves the control method of system schema of efficiency: by the commutation of cross valve and bypass action, under realizing refrigeration, heating mode, improve the object of efficiency; Corresponding control logic is as follows:

1. in cooling mode, when compressor frequency >=the first predeterminated frequency value (such as: XHz, X is real number) and super cooling effect comes into force time, increase enthalpy cross valve (such as: increase enthalpy cross valve 22) power-off, gas bypass solenoid valve 23 powers on simultaneously, subcooler expansion valve 6 does not leave, when (preventing synergy cross valve 22 from collaborating after duration of ventilation >=preset duration Tmin (such as: 0.5min), T is real number), gas bypass solenoid valve 23 power-off, super-cooling pipeline 19 is opened (spraying to gas-liquid separator), subcooler expansion valve 6 is opened, by system degree of supercooling control valve expansion aperture, and then under realizing refrigeration mode, the degree of supercooling of raising system, and then realize the object of raising ability efficiency, simultaneously, because S and the C increasing enthalpy cross valve 22 is connected low-pressure side, also prevent the abnormal sound produced because pressure reduction is unstable of the check valve 24 increasing enthalpy pipeline 20.

2. at heating mode, under refrigeration mode, when compressor frequency >=the second predeterminated frequency value (such as: YHz, Y is real number) and when increasing enthalpy effect, synergy cross valve (such as: increase enthalpy cross valve 22), the other electromagnetism energising 23 of gas, subcooler expansion valve 6 does not leave, when duration of ventilation >=preset duration (such as: Zmin, Z is real number) (guarantee to increase enthalpy cross valve 22 to commutate completely) gas bypass solenoid valve 23 power-off afterwards, increase enthalpy pipeline 20 to open (spraying to compressor), subcooler expansion valve 6 is opened, by the aperture increasing enthalpy degree of superheat control expansion valve, realization heats, the raising of ability under refrigeration mode, and by increasing enthalpy ability ratio, reduce compressor frequency, and then reach the object putting forward effect.

3. when compressor frequency < first predeterminated frequency value or the second predeterminated frequency value [such as: X (Y) Hz] or when crossing cold Pending The Entry Into Force or increasing enthalpy Pending The Entry Into Force, synergy cross valve (such as: four way solenoid valve 22) power-off, and closed condition is transferred to by subcooler expansion valve 6.

4., when gas bypass solenoid valve 23 controls to come into force, synergy cross valve (such as: four way solenoid valve 22) power-off at once, closed condition is transferred to by subcooler expansion valve 6 simultaneously, after gas bypass solenoid valve controls inefficacy, then presses demand modeling.

The process realized due to the method for the present embodiment and function are substantially corresponding to the embodiment of the system shown in earlier figures 2 to Fig. 5, principle and example, therefore not detailed part in the description of the present embodiment, see the related description in previous embodiment, can not repeat at this.

Through a large amount of verification experimental verifications, adopt technical scheme of the present invention, switching device shifter can be passed through, carry out being combined with switching based on mode of operation to high-efficient compressor and economizer, with improved by high-efficient compressor system heating capacity, improved by economizer system refrigeration cold energy power, and final outstanding solve the problem improving system capability and improve system energy efficiency.

Also it should be noted that, term " comprises ", " comprising " or its any other variant are intended to contain comprising of nonexcludability, thus make to comprise the process of a series of key element, method, commodity or equipment and not only comprise those key elements, but also comprise other key elements clearly do not listed, or also comprise by the intrinsic key element of this process, method, commodity or equipment.When not more restrictions, the key element limited by statement " comprising ... ", and be not precluded within process, method, commodity or the equipment comprising described key element and also there is other identical element.

The foregoing is only embodiments of the 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 right of the present invention.

Claims (16)

1. a multi-online air-conditioning system, comprising: compressor, evaporimeter, condenser and subcooler, and the backflow end of described subcooler is back to described compressor by return line; It is characterized in that,

Between described return line and described compressor, be also connected with super-cooling pipeline in parallel and increase enthalpy pipeline, after wherein said super-cooling pipeline and evaporator discharge pipeline converge, being connected to the low pressure air suction end of described compressor; And described increasing enthalpy pipeline is connected to the intermediate pressure suction end of described compressor; And described system also comprises the switching device shifter controlling described super-cooling pipeline and/or increasing enthalpy pipeline and open or close.

2. system according to claim 1, is characterized in that, described switching device shifter comprises the increasing enthalpy valve crossed low temperature valve and be arranged on described increasing enthalpy pipeline be arranged on described super-cooling pipeline.

3. system according to claim 1, is characterized in that, described switching device shifter comprises the three-way diverter valve be arranged between described return line and described super-cooling pipeline, described increasing enthalpy pipeline.

4. system according to claim 1, it is characterized in that, described switching device shifter comprises the first cross valve, and four links of described first cross valve are connected with the low pressure air suction pipeline end of described compressor with described return line, described super-cooling pipeline, described increasing enthalpy pipeline respectively.

5. system according to claim 4, it is characterized in that, the backflow end of described subcooler be connected to described return line part also branch have gas bypass line, the other end of this gas bypass line is connected to the exhaust end of described compressor, and described gas bypass line is provided with gas bypass solenoid valve.

6. according to the system one of claim 1-5 Suo Shu, it is characterized in that, described increasing enthalpy pipeline is also provided with and only allows fluid to flow to first check valve in described compressor direction from subcooler direction.

7. according to the system one of claim 1-6 Suo Shu, it is characterized in that, the heat-releasing pipeline of described subcooler and the cold-producing medium upstream end of heat absorption pipeline are positioned at the same side of described subcooler; And the cold-producing medium outlet side of the heat-releasing pipeline of described subcooler and heat absorption pipeline is positioned at the same side of described subcooler.

8. system according to claim 7, is characterized in that, the inlet end of the heat-releasing pipeline of described subcooler is provided with the first expansion valve.

9. according to the system one of claim 1-8 Suo Shu, it is characterized in that, the exhaust end pipeline of described compressor is provided with the second cross valve, and other three links of described second cross valve are connected respectively to described evaporimeter, described condenser and described super-cooling pipeline.

10. according to the system one of claim 1-9 Suo Shu, it is characterized in that, when described evaporimeter is outdoor heat exchanger, described condenser is indoor heat exchanger; When described evaporimeter is indoor heat exchanger, described condenser is outdoor heat exchanger.

11. systems according to claim 10, it is characterized in that, described outdoor heat exchanger is connected on the pipeline between described subcooler and is provided with the second expansion valve, and described second expansion valve is arranged in parallel allow cold-producing medium outdoor heat exchanger flow to the second check valve of described subcooler.

The control method of 12. 1 kinds of multi-gang air-conditioners, is characterized in that, uses the multi-online air-conditioning system that one of claim 1-11 is described, according to the ruuning situation of reality, is controlled accordingly by the switching of described switching device shifter to described multi-online air-conditioning system.

13. control methods according to claim 12, is characterized in that, under the pattern of indoor heat exchanger refrigeration, as compressor frequency >=XHz and super cooling effect comes into force time, regulate described switching device shifter that super-cooling pipeline is opened, the closedown of described increasing enthalpy pipeline.

14. control methods according to claim 12, is characterized in that, to heat or under the pattern of freezing at indoor heat exchanger, when increasing enthalpy effect, regulate described switching device shifter that super-cooling pipeline is closed, described increasing enthalpy pipeline unlatching as compressor frequency >=YHz.

15. control methods according to claim 12, is characterized in that, as compressor frequency <X or YHz, or when crossing cold Pending The Entry Into Force or increasing enthalpy Pending The Entry Into Force, or regulate described switching device shifter that super-cooling pipeline and described increasing enthalpy pipeline are opened.

16. according to the control method one of claim 12-15 Suo Shu, it is characterized in that, when described system has gas bypass line and the first expansion valve, before the described switching device shifter of adjustment makes super-cooling pipeline and/or increases the unlatching of enthalpy pipeline, regulate power-off or the energising of the first cross valve and/or gas bypass solenoid valve, and/or regulate the first expansion valve, described subcooler is ventilated, when after ventilation preset duration, by the power-off of described gas bypass solenoid valve, more described super-cooling pipeline and/or increasing enthalpy pipeline are opened.