CN1782571A - Electromagnetic expansion valve control method of central air conditioner - Google Patents
Electromagnetic expansion valve control method of central air conditioner Download PDFInfo
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- CN1782571A CN1782571A CN 200410093764 CN200410093764A CN1782571A CN 1782571 A CN1782571 A CN 1782571A CN 200410093764 CN200410093764 CN 200410093764 CN 200410093764 A CN200410093764 A CN 200410093764A CN 1782571 A CN1782571 A CN 1782571A
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Abstract
The present invention relates to control method of central air conditioner, and is especially the electromagnetic expansion valve control method of central air conditioner through regulating the pulse value according to the difference between the set temperature and the measured room temperature so as to control the openings of the electromagnetic expansion valves and to regulate the indoor temperatures to the set values in high speed and less flocculation. The control method includes the following steps: measuring indoor temperature and setting temperature and comparing; calculating the difference between the set temperature and the measured temperature; and increasing or decreasing the pulse value of the electromagnetic expansion valve to regulate its opening.
Description
Technical field
The present invention relates to a kind of central air-conditioning control method; In more detail, central air-conditioning electromagnetic expansion valve control method of the present invention is poor according to design temperature and indoor temperature, regulating impulse value, the degree of opening of control electromagnetic expanding valve, improve indoor temperature and adjust to the speed of design temperature, prevent temperature float (hunting).
Background technology
Air-conditioning is arranged in the spaces such as room, room, office, business shop, and temperature, humidity, cleanliness factor and the air-flow of air are adjusted, and the device of suitable indoor environment is provided, and it can be divided into integral air conditioner and separation type air-conditioning substantially.
Above-mentioned integral air conditioner and separation type air-conditioning have identical functions.Usually, integral air conditioner is arranged on the body of wall of punching or window.The separation type air-conditioning has indoor set and off-premises station.Indoor set is arranged on indoor, freezes, heats operation.Off-premises station is arranged on outdoor, dispels the heat, operation such as compression.Above-mentioned indoor set is connected by the refrigerant pipe with off-premises station.
Usually, corresponding to an off-premises station, an indoor set is set.The space is provided with air-conditioning in multi-chamber if desired, then needs to be provided with several off-premises stations, not only outward appearance is produced bad influence, and raises the cost, and also needs to be provided with the space of many off-premises stations, reduces the space service efficiency.
Therefore, recently very active to the research and development of central air-conditioning.So-called central air-conditioning refers to, and connects a kind of separation type air-conditioning of a plurality of indoor sets on an off-premises station.
Fig. 1 is an ordinary central air-conditioner refrigerant circuit structure figure.
Above-mentioned central air-conditioning has indoor unit 10 and outdoor unit 1.Indoor unit 10 is positioned at indoor, has several indoor heat converters 11a, 11b, and 11c freezes, heats operation.Outdoor unit 1 is arranged on outdoor.
Above-mentioned outdoor unit 1 has variable speed compressor 2, constant speed compressor 3, outdoor heat converter 5, cooling fan 6.3 pairs of refrigerants of variable speed compressor 2 and constant speed compressor compress.Outdoor heat converter 5 allows the refrigerant of compression dispel the heat.Cooling fan 6 is arranged on a side of above-mentioned outdoor heat converter 5, allows refrigerant accelerate heat radiation.
When carrying out refrigerating operaton, be as the criterion with the flow direction of refrigerant, the downstream side of above-mentioned outdoor heat converter 5 is provided with main electromagnetic expanding valve 12.The downstream side of above-mentioned main electromagnetic expanding valve 12 is provided with auxiliary selenoid expansion valve 13a, and 13b, 13c, above-mentioned auxiliary selenoid expansion valve 13a, 13b, 13c allow refrigerant flow into respective chambers heat exchanger 11a, and 11b before the 11c, further expands, reduces pressure.Above-mentioned indoor heat converter 11a, 11b, each outlet of 11c is provided with the 1st temperature sensor 15a, 15b, 15c, to above-mentioned indoor heat converter 11a, 11b, the refrigerant temperature that 11c discharges carries out perception.
Above-mentioned constant speed compressor 3 and variable speed compressor 2 have the compression horsepower that can tackle indoor unit 1 maximum refrigeration, heat load 50%, it is converging together mutually before refrigerant inflow outdoor heat exchanger 5 that each discharges side, in its zone of confluxing, be provided with the 2nd temperature sensor 4 that the refrigerant temperature of discharging from each compressor 2,3 compression back is carried out perception.The entrance side of above-mentioned compressor 2,3 is provided with the 3rd temperature sensor 17 in addition, and the refrigerant temperature that flow into compressor is carried out perception.
Below, the process of refrigerastion of above-mentioned central air-conditioning is described.
The gas coolant that is compressed into the HTHP attitude in compressor 2,3 flows into above-mentioned outdoor heat exchange and plays 5 under the effect of four-way valve (figure slightly).Above-mentioned refrigerant is condensed into the liquid refrigerants of HTHP in the process that flows through above-mentioned outdoor heat converter 5.After the liquid refrigerant of HTHP that flows out from above-mentioned outdoor heat converter 5 flows into main electromagnetic expanding valve 12, flow through auxiliary selenoid expansion valve 13a, 13b, 13c becomes the state of low-temp low-pressure, inflow indoor heat exchanger 11a, 11b, 11c.The refrigerant that flows into becomes gaseous coolant, by the suction side of four-way valve water conservancy diversion to compressor 2,3 by evaporation.
At this moment, flow through above-mentioned indoor heat converter 11a, 11b, the refrigerant of 11c absorbs heat from room air, evaporates.Along with carrying out kind of refrigeration cycle repeatedly, the temperature of conditioned space can descend.
In addition, in order indoor temperature to be adjusted to temperature that the user sets (promptly, target temperature), whether are the speed of needs adjusting variable speed compressor 2 or the open and close of constant speed compressor 3, and the compression horsepower of compressor is controlled, and make the power of compressor corresponding with above-mentioned total load amount, and the openness of correspondingly regulating electromagnetic expanding valve 13a, 13b, 13c, to flowing through each indoor heat converter 11a, 11b, the coolant quantity of 11c carries out suitable control.
The refrigerant temperature that above-mentioned indoor heat converter 11a, 11b, 11c discharge, promptly outlet temperature is measured by the 1st temperature sensor 15a, 15b, 15c, and flows into the refrigerant temperature of each compressor 2,3, and promptly inlet temperature is measured by the 3rd temperature sensor 17.Openness to above-mentioned electromagnetic expanding valve 13a, 13b, 13c is suitably controlled, and allows the difference of above-mentioned outlet temperature and inlet temperature keep setting value (being called " degree of superheat ")., cold refrigerant then might occur and flow into situation in the above-mentioned compressor 2,3 less than above-mentioned setting value such as the difference of outlet temperature and inlet temperature.Therefore, need to reduce the pulse value of electromagnetic expanding valve 13a, 13b, 13c, reduce its degree of opening, reduce the coolant quantity that flows into above-mentioned indoor heat converter 11a, 11b, 11c, solve above-mentioned supercooled state, and above-mentioned difference means then that greater than setting value above-mentioned indoor heat converter 11a, 11b, 11c are in overload.Therefore, need to improve the pulse value of electromagnetic expanding valve 13a, 13b, 13c, increase its degree of opening, increase the coolant quantity that flows into above-mentioned indoor heat converter 11a, 11b, 11c, solve above-mentioned overload.
Fig. 2 adjusts to indoor temperature in the conditional curve figure of design temperature for by traditional electromagnetic expansion valve control method.
After the user sets indoor temperature, start air-conditioning.At this moment, air-conditioning is calculated their sum total, i.e. the total load amount after each chamber load of each indoor heat converter is calculated.Compressor is regulated compression horsepower according to above-mentioned total load amount.The electromagnetic expanding valve that is connected with each indoor heat converter according to above-mentioned each chamber load, determines its pulse value, regulates the refrigerant influx of each indoor heat converter.
Electromagnetic expanding valve is by above-mentioned initial pulse value, determine the refrigerant influx of each indoor heat converter after, carry out repeatedly heating circulation by what following each process was formed, improve indoor temperature ((a) part).Be the compressor process of discharging the coolant quantity corresponding with above-mentioned total load amount, flow into each indoor heat converter with the corresponding coolant quantity of each chamber load after, with room air carry out heat exchange (condensation) process, the refrigerant after the heat exchange by electromagnetic expanding valve convert the process of low-temp low-pressure refrigerant to, when above-mentioned low-temp low-pressure refrigerant flows through outdoor heat converter, the process of carrying out heat exchange (evaporation) with outdoor air.
When indoor temperature is higher than design temperature, (please refer to A) when being in superheat state, control part reduces certain value to the pulse value of electromagnetic expanding valve, regulates its openness, reduces the refrigerant influx of each indoor heat converter.Along with the refrigerant influx minimizing of each chamber heat exchanger, indoor temperature can decrease ((b) part).
Next, press under the state that certain value reduces the electromagnetic expanding valve pulse value ((b) part), through behind the certain hour, indoor temperature can be lower than design temperature, and indoor set is in overload (please refer to B).At this moment, control part improves certain value to the pulse value of electromagnetic expanding valve, regulates its openness, increases the refrigerant influx of each indoor heat converter.Along with the refrigerant influx increase of each chamber heat exchanger, indoor temperature can increase ((c) part).
In traditional electromagnetic expansion valve control method, when indoor temperature is higher than design temperature,, reduce the refrigerant influx of indoor heat converter, reduce indoor temperature by reducing the electromagnetic expanding valve pulse value of certain value.If indoor temperature is lower than design temperature, then, increase the refrigerant influx of indoor heat converter by increasing the electromagnetic expanding valve pulse value of certain value, improve indoor temperature.Conventional art is adjusted to the design temperature that the user wishes by said method by indoor temperature.
But, reduce a certain amount of refrigerant influx with indoor heat converter when overheated, when being in overload, improves indoor heat converter the mode of a certain amount of refrigerant influx, and when electromagnetic expanding valve was controlled, there are the following problems.In the conventional art, do not consider the difference of indoor temperature and design temperature, pulse value to electromagnetic expanding valve increases and decreases certain value without exception, the time of indoor temperature being adjusted to design temperature is very long, but also situation shown in (d) part of Fig. 2 might appear, periodically floating (hunting) and can't adjusting to design temperature appears in indoor temperature.
Summary of the invention
The present invention proposes in order to address the above problem, its purpose is for providing a kind of control method of central air-conditioning electromagnetic expanding valve, poor according to design temperature and indoor temperature, the regulating impulse value, the degree of opening of control electromagnetic expanding valve, improve indoor temperature and adjust to the speed of design temperature, prevent that temperature is unsteady.
To achieve these goals, the control method of central air-conditioning electromagnetic expanding valve of the present invention is characterized in that: comprise and measure indoor temperature and design temperature, and the stage that compares; The stage that difference between indoor temperature and the design temperature is calculated; If the said temperature difference is big, then significantly increase and decrease the pulse value of electric expansion valve, its openness is regulated, if the said temperature difference is little, then slightly increase and decrease the pulse value of electric expansion valve, the stage that its openness is regulated.
In one embodiment of the invention, if the said temperature difference is greater than 4C, then above-mentioned control impuls value increase and decrease " 8 " pulse (pulse), if the said temperature difference is greater than 3C, less than 4C, then above-mentioned control impuls value increase and decrease " 6 " pulse, if the said temperature difference is greater than 2C, less than 3C, then above-mentioned control impuls value increase and decrease " 4 " pulse, if the said temperature difference is greater than 1C, less than 2C, then above-mentioned control impuls value increase and decrease " 2 " pulse, if the said temperature difference is less than 1C, then above-mentioned control impuls value increase and decrease " 0 " pulse.
In the embodiments of the invention, when carrying out heating operation, the temperature difference according to both when above-mentioned design temperature is higher than indoor temperature increases above-mentioned control impuls value, and above-mentioned design temperature when being lower than indoor temperature the temperature difference according to both reduce above-mentioned control impuls value; Temperature difference according to both when above-mentioned design temperature is higher than indoor temperature when carrying out refrigerating operaton reduces above-mentioned control impuls value, and above-mentioned design temperature when being lower than indoor temperature the temperature difference according to both increase above-mentioned control impuls value.
Central air-conditioning electromagnetic expansion valve control method of the present invention has following invention effect.Among the present invention, if the difference of indoor temperature and design temperature is big, then to increase and decrease the pulse value of electromagnetic expanding valve significantly, if the difference of indoor temperature and design temperature is little, then increasing and decreasing the pulse value of electromagnetic expanding valve by a small margin,
That is, when the said temperature difference is big, allows the refrigerant influx of indoor heat converter significantly increase or reduce, it is poor to reduce said temperature fast.If the said temperature difference is little, then allow the refrigerant influx of indoor heat converter increase on a small quantity or reduce, can allow indoor temperature fast to the design temperature adjustment.
Thereby, can improve the speed that indoor temperature is adjusted to design temperature, prevent that temperature is unsteady.
Description of drawings
Fig. 1 is an ordinary central air-conditioner refrigerant loop block diagram.
Fig. 2 adjusts to indoor temperature in the conditional curve figure of design temperature for by traditional electromagnetic expansion valve control method.
Fig. 3 is a central air-conditioning block diagram of the present invention.
Fig. 4 is a central air-conditioning general structure block diagram of the present invention.
Fig. 5 is a central air-conditioning refrigerant of the present invention loop block diagram.
Fig. 6 is the central air-conditioning electromagnetic expansion valve control method flow chart of one embodiment of the invention.
Fig. 7 is in the electromagnetic expansion valve control method of one embodiment of the invention, indoor temperature is adjusted to the conditional curve figure of design temperature.
The critical piece description of reference numerals
100,180: off-premises station 102,160: the 1 distributors
110: the 2 distributors 104,142: the 1 indoor sets
106,144: the 2 indoor sets 108,146: the 3 indoor sets
142a: the 1st indoor heat converter 144a: the 2nd indoor heat converter
146a: 162: the 1 electromagnetic expanding valves of the 3rd indoor heat converter
166: the 3 electromagnetic expanding valves of 164: the 2 electromagnetic expanding valves
170: the 2 branched pipes of 168: the 1 branched pipes
182: variable speed compressor 184: constant speed compressor
190: holding vessel 192: four-way valve
194: outdoor heat converter P1: main pipe arrangement
P3, P3, P4, P5, P6, P7: the 1st, 2,3,4,5,6 pipe arrangements
The specific embodiment
Below, with reference to accompanying drawing,, be elaborated to central air-conditioning electromagnetic expansion valve control method of the present invention.
Fig. 3 is a central air-conditioning block diagram of the present invention.Fig. 4 is a central air-conditioning general structure block diagram of the present invention.
The central air-conditioning that air-conditioning of the present invention utilizes 2 distributors that 6 chambers are controlled.Central air-conditioning of the present invention has off-premises station 100, the 1st and the 2nd distributor 102,110 that is connected with off-premises station 100, is arranged on each the 1st to the 6th indoor indoor set 104,106,108,112,114,116.Above-mentioned off-premises station 100 is connected by main pipe arrangement P1 with the 1st, the 2nd distributor 102,110.Above-mentioned the 1st distributor 102 and the 1st to 3 indoor set 104,106,108 be by the 1st, 2,3 pipe arrangement P2, P3, and P4 connects, and above-mentioned the 2nd distributor 110 and the 4th to 6 indoor set 112,114,116 be by the 4th, 5,6 pipe arrangement P5, and P6, P7 connects.
Here, above-mentioned pipe arrangement (P1 is to P7) formed by the structure that inflow pipe and effuser isolation are provided with respectively.Refrigerant by above-mentioned inflow pipe from the off-premises station side flow to indoor pusher side, by above-mentioned effuser from the indoor set side flow to outdoor pusher side.
Above-mentioned heat exchanger 100 inside, the outdoor controller 120 that is provided with variable speed compressor, constant speed compressor, holding vessel, four-way valve, outdoor heat converter, outdoor fan and controls above-mentioned parts.On the above-mentioned distributor 102,110, be provided with dispensing controller 122,130, be used to control the electromagnetic expanding valve that refrigerant is carried out puffing.On the above-mentioned indoor set (104 to 116), the indoor controller (124 to 136) that leaf has indoor heat exchanger, indoor fan etc. and controls above-mentioned parts.
The user is by pressing key, after the input air-conditioning work order (refrigeration), the indoor controller 124 to 136 of one or more selected indoor sets (104 to 116), the data such as power of collecting design temperature, current indoor temperature, setting air quantity, each indoor set pass to outdoor controller 120.Above-mentioned outdoor controller 120 is further analyzed other data such as outdoor temperatures again, after calculating the required total load of selected indoor set operation, it is benchmark that above-mentioned data are passed to the dispensing controller 122,130 time with above-mentioned data, and compressor is driven.
The refrigerant of discharging during compressor operating, flow through outdoor heat converter after, by the inflow pipe of main pipe arrangement P1, flow into above-mentioned the 1st, the 2nd distributor 102,110.Flow into the refrigerant of above-mentioned the 1st, the 2nd distributor 102,110, be depressurized expansion when flowing through with electromagnetic expanding valve that each indoor heat converter is connected after, along the inflow pipe of above-mentioned the 1st to the 6th pipe arrangement (P2 is to P7), flow to each indoor set (104 to 116).
When the refrigerant that flows into above-mentioned each indoor set (104 to 116) flows through indoor heat converter, after carrying out heat exchange, effuser along above-mentioned the 1st to the 6th pipe arrangement (P2 is to P7) flows, after confluxing in above-mentioned the 1st to the 2nd distributor 102,110, by the effuser inflow off-premises station 100 of main pipe arrangement P1.
Central air-conditioning of the present invention connects an off-premises station and a plurality of indoor set by distributor.In the conventional art, if during by 6 indoor sets of off-premises station control, 6 inflow pipes and six effusers need be set, promptly total 12 pipe arrangements.Therefore, not only not attractive in appearance in appearance, and also its pipe arrangement setup fee is also very high.
The present invention is by adopting distributor, single pipe arrangement is set till from the off-premises station to the distributor, from above-mentioned distributor to off-premises station till, each pipe arrangement is set, not only can improve outward appearance, and can also solve the cost issues that causes by pipe arrangement quantity.
Fig. 5 is a central air-conditioning refrigerant of the present invention loop block diagram.As utilizing two distributors to control the central air-conditioning of Room 6, off-premises station the 100, the 1st distributor the 102, the 1st to the 3rd indoor set (104 to 108) only draws in this accompanying drawing.
In each chamber of indoor 140, be respectively equipped with the 1st, 2,3 indoor sets.1st, 2,3 indoor sets have the 1st, 2,3 indoor heat converter 142a, 144a, 146a and the 1st, 2,3 indoor fan 142b, 144b, 146b respectively.
Off-premises station 180 has variable speed compressor 182 and constant speed compressor 184.Variable speed compressor 182 and constant speed compressor 184 are discharged after refrigerant is compressed into high-temperature high-pressure state.On the discharge portion of above-mentioned each compressor, be respectively equipped with the 1st oil feeder 186 and the 2nd oil feeder 188.Conflux after the refrigerant that above-mentioned variable speed compressor 182 and constant speed compressor 184 are discharged flows through above-mentioned the 1st oil feeder 186 and the 2nd oil feeder 188 respectively, flow into four-way valve 192.
When above-mentioned four-way valve 192 is air-conditioning conversion operation mode, allow the flow path of refrigerant play the device of respective change.When air-conditioning freezed operation, refrigerant was pressed the solid arrow direction and is flowed into, flows out, and when heating operation, and refrigerant press that the dotted arrow direction flows into, outflow.The refrigerant that above-mentioned each compressor 182,184 is discharged, under the guide functions of above-mentioned four-way valve 192, flowed into chamber outer heat-exchanger 194 when air-conditioning freezes, and air-conditioning flows to the 1st distributor 160 when heating.
The inside of above-mentioned the 1st distributor 160 has the 1st branched pipe 168 and the 2nd branched pipe 170.
Above-mentioned the 1st branched pipe 168 be assigned in each indoor set, and above-mentioned the 2nd branched pipe 170 allows the refrigerant that the inflow pipe 198a by main pipe arrangement flows into the refrigerant of discharging from each indoor set be flowed to one (when heating) in contrast.
The inflow pipe 198a of main pipe arrangement P1 is the quilt inflow pipe 167 of inflow pipe the 165, the 3rd pipe arrangement P4 of inflow pipe the 163, the 2nd pipe arrangement P3 of one-tenth the 1st pipe arrangement P2 of branch in above-mentioned the 1st branched pipe 168.And the effuser 198b of main pipe arrangement P1 quilt effuser 147 of effuser the 145, the 3rd pipe arrangement P4 of effuser the 143, the 2nd pipe arrangement P3 of one-tenth the 1st pipe arrangement P2 of branch in above-mentioned the 2nd branched pipe 170.
On the inflow pipe 163,165,167 of above-mentioned the 1st, 2,3 pipe arrangements, be respectively equipped with the 1st, 2,3 electromagnetic expanding valves 162,164,166.Above-mentioned each electromagnetic expanding valve becomes the refrigerant puffing that flows into each indoor set the refrigerant of low-temp low-pressure.By the refrigerant of above-mentioned the 1st to the 3rd electromagnetic expanding valve (162 to 166) puffing, by inflow pipe (163 to 167) inflow the 1st to the 3rd indoor heat converter (142a is to 146a) of above-mentioned the 1st to the 3rd pipe arrangement.After carrying out heat exchange when flowing through above-mentioned the 1st to the 3rd indoor heat converter (142a is to 146a), refrigerant flows into above-mentioned the 2nd branched pipe 170 by the effuser (143 to 147) of above-mentioned the 1st to the 3rd pipe arrangement.
Above-mentioned the 2nd branched pipe 170 is connected with four-way valve 192.Flow out the refrigerant (solid arrow) under the guide functions of above-mentioned four-way valve 192 of above-mentioned the 2nd branched pipe 170, flow into holding vessel 190.Above-mentioned holding vessel 190 is connected with the inflow entrance of variable speed compressor 182 with constant speed compressor 184.Under the effect of above-mentioned holding vessel 190, flow through above-mentioned the 1st, 2,3 heat exchanger 142a, 144a, the liquid refrigerants that is not evaporated during 146a can not flow to above-mentioned each compressor 182,184.
Central air-conditioning of the present invention moves freely to connect (free joint) mode.So-called free connected mode is, the discharge portion of compressor is combined into a discharge portion, and the refrigerant that allows each compressor discharge flows into a certain a kind of mode that needs the refrigerant loop of refrigerant, rather than allows the refrigerant of a certain compressor only flow to the mode in some refrigerant loop.
Thereby the frequency and the operation method of compressor are regulated in load that can be on demand, can move with energy-saving mode, but also can substitute a large-scale compressor with two light duty compressors, the cost of reduction compressor.
Fig. 3 has adopted two distributors to the central air-conditioning among Fig. 5, and 6 each indoor set are controlled.But technological thought of the present invention is not subjected to the restriction of the number of number, indoor set of above-mentioned distributor and the kind of indoor set (such as, ceiling mounting type, basket formula etc. mutually).
Fig. 6 is the central air-conditioning electromagnetic expansion valve control method flow chart of one embodiment of the invention.
The control method of central air-conditioning electromagnetic expanding valve of the present invention is characterized in that: comprises and measures indoor temperature and design temperature, and the stage that compares; The stage that difference between indoor temperature and the design temperature is calculated; If the said temperature difference is big, then significantly increase and decrease the pulse value of electric expansion valve, its openness is regulated, if the said temperature difference is little, then slightly increase and decrease the pulse value of electric expansion valve, the stage that its openness is regulated.
Below, the situation when carrying out heating operation is an example, to electromagnetic expansion valve control method one embodiment of the present invention, is elaborated.
After the user set the temperature that needs, central air-conditioning was started working, and each chamber load of each indoor heat converter is calculated, and according to the sum total of each chamber load the compression horsepower of compressor is regulated.With indoor set 142a, 144a, electromagnetic expanding valve 162,164,166 the loads that 146a connects, decision initial pulse value, the refrigerant influx of regulating each indoor set according to each chamber.
Electromagnetic expanding valve 162,164,166 is according to above-mentioned initial pulse value, after determining each indoor-unit cooling-medium influx, after compressor 182,184 is discharged the coolant quantity corresponding with above-mentioned total load amount, supply corresponding with it coolant quantity respectively to each indoor heat converter 142a, 144a, 146a.After above-mentioned refrigerant and room air carry out heat exchange (condensation), be transformed into the refrigerant of low-temp low-pressure, when the refrigerant of above-mentioned low-temp low-pressure flows through outdoor heat converter 194, carry out heat exchange with outdoor air.Air-conditioning improves indoor temperature by carrying out the above-mentioned circulation that heats repeatedly.
In addition, heat repeatedly in the process of circulation, indoor temperature and design temperature are compared repeatedly by some cycles.By measuring the variation of each chamber load at any time, can adjust compressor horsepower by each chamber load, regulate the openness of electromagnetic expanding valve, make it corresponding with each chamber load.In one embodiment of the invention, indoor temperature and design temperature are compared (S100 stage).If design temperature greater than indoor temperature, then deducts the indoor temperature value from above-mentioned set temperature value, calculate its temperature contrast (S102 stage).If design temperature is not more than indoor temperature, then deduct set temperature value from above-mentioned indoor temperature value, calculate its temperature contrast (S104 stage).
Here, if indoor temperature and design temperature difference are big, the degree of superheat that then means indoor heat converter is than higher or its overload quantity is bigger.If temperature difference is little, mean that then the degree of superheat of indoor heat converter is smaller or its overload quantity is smaller.
Among the present invention,, regulate its openness according to the pulse value of said temperature difference change electromagnetic expanding valve.At first, whether the temperature difference is judged (S106 stage) less than 1C.If the said temperature difference, then allows pulse value increase and decrease " 0 " pulse of being used to control the electromagnetic expanding valve openness (design temperature increases during greater than indoor temperature, reduces when design temperature is not more than indoor temperature) (S108 stage) less than 1C.If the said temperature difference, means then that indoor temperature is in close proximity to design temperature less than 1C, can be judged as indoor temperature and be in the state of adjusting to design temperature, need not increase or reduce the refrigerant influx of indoor heat converter.Therefore, the said temperature difference is during less than 1C, allows pulse value increase and decrease " 0 " pulse that is used to control the electromagnetic expanding valve openness, and the refrigerant influx of indoor heat converter is remained unchanged.
In addition, S106 is in the stage, if the said temperature difference is not less than 1C, then whether less than 2C, promptly 1C＜temperature difference≤2C judges (S110 stage).If the said temperature difference, then allows pulse value increase and decrease " 2 " pulse that is used to control the electromagnetic expanding valve openness less than 2C.That is, design temperature increases " 2 " pulse during greater than indoor temperature, reduces " 2 " pulse (S112 stage) when design temperature is not more than indoor temperature.Omit height or a little less than design temperature, can be judged as the adjustment state that approaches if the said temperature difference, then means indoor temperature less than 2C, the refrigerant influx by a small amount of increase or minimizing indoor set allows indoor temperature adjust to design temperature.
Above-mentioned S110 is in the stage, if the said temperature difference is not less than 2C, then whether less than 3C, promptly 2C＜temperature difference≤3C judges (S114 stage).If the said temperature difference, then allows pulse value increase and decrease " 4 " pulse that is used to control the electromagnetic expanding valve openness less than 3C.That is, design temperature increases " 4 " pulse during greater than indoor temperature, reduces " 4 " pulse (S116 stage) when design temperature is not more than indoor temperature.If the said temperature difference, then means the user less than 3C and can feel that temperature do not adjust to the state of design temperature.In one embodiment of the invention,,, reduce the refrigerant influx of indoor set, allow indoor temperature reduce by reducing the pulse value that is used to control the electromagnetic expanding valve openness with 4 pulses if when above-mentioned indoor temperature is higher than design temperature near 3C.When if above-mentioned indoor temperature is lower than design temperature near 3C, by be used to control the pulse value of electromagnetic expanding valve openness with 4 pulse increases, improve the refrigerant influx of indoor set, allow indoor temperature raise.
Above-mentioned S114 is in the stage, if the said temperature difference is not less than 3C, then whether less than 4C, promptly 3C＜temperature difference≤4C judges (S118 stage).If the said temperature difference, then allows pulse value increase and decrease " 6 " pulse that is used to control the electromagnetic expanding valve openness less than 4C.(that is, design temperature increases " 6 " pulse during greater than indoor temperature, reduces " 6 " pulse when design temperature is not more than indoor temperature) (S120 stage).If the said temperature difference, then allows pulse value increase and decrease " 8 " pulse that is used to control the electromagnetic expanding valve openness greater than 4C.(that is, design temperature increases " 8 " pulse during greater than indoor temperature, reduces " 8 " pulse when design temperature is not more than indoor temperature) (S122 stage), increase or reduce the refrigerant influx of indoor heat converter according to above-mentioned control impuls value.
In the electromagnetic expansion valve control method of the present invention, when the difference of indoor temperature and design temperature is big, significantly increase or reduce the control impuls value, when the difference of indoor temperature and design temperature hour, slightly increase or reduce the control impuls value, according to the temperature extent, the variation of control heat exchanger refrigerant influx.In this and the conventional art no matter the temperature extent, just by the method difference of a certain amount of increase and decrease heat exchanger refrigerant influx.
Among the present invention, when the difference between indoor temperature and the design temperature is big, significantly increase or reduce the refrigerant influx of heat exchanger, reduce temperature contrast fast, and under the smaller situation of temperature difference, slightly increase or reduce the refrigerant influx of heat exchanger, allow indoor temperature adjust to design temperature quickly.
As shown in Figure 6, if the difference of indoor temperature and design temperature greater than 4C, then allows the control impuls value be " 8 " pulse.If the difference of indoor temperature and design temperature greater than 3C, less than 4C, then allows the control impuls value be " 6 " pulse.But this is one embodiment of the invention.Technological thought of the present invention is by the temperature extent, to increase and decrease above-mentioned control impuls value with corresponding amplitude.Promptly relevant with temperature difference pulse value variable quantity can be different slightly.
In addition, in the foregoing description, be that example is illustrated with the heating operation.But also can be suitable for principle of the present invention when freezing operation.If promptly the temperature difference is big then with big amplitude increase and decrease pulse value, if having a narrow range of temperature then with small size increase and decrease pulse value.
Such as, in the process of operation of freezing, design temperature is during greater than indoor temperature, if temperature difference is greater than 4C, then above-mentioned control impuls value is reduced " 8 " pulse (pulse), if the said temperature difference greater than 3C, less than 4C, then reduces " 6 " pulse to above-mentioned control impuls value, if the said temperature difference is greater than 2C, less than 3C, then above-mentioned control impuls value is reduced " 4 " pulse, if the said temperature difference is greater than 1C, less than 2C, then above-mentioned control impuls value is reduced " 2 " pulse, if the said temperature difference less than 1C, then reduces " 0 " pulse to above-mentioned control impuls value.
On the contrary, design temperature is during less than indoor temperature, if temperature difference is greater than 4C, then above-mentioned control impuls value is increased " 8 " pulse (pulse), if the said temperature difference is greater than 3C, less than 4C, then above-mentioned control impuls value is increased " 6 " pulse, if the said temperature difference is greater than 2C, less than 3C, then above-mentioned control impuls value is increased " 4 " pulse, if the said temperature difference greater than 1C, less than 2C, then increases " 2 " pulse to above-mentioned control impuls value, if the said temperature difference less than 1C, then increases " 0 " pulse to above-mentioned control impuls value.
Fig. 7 is in the electromagnetic expansion valve control method of one embodiment of the invention, indoor temperature is adjusted to the conditional curve figure of design temperature.This curve is the temperature trend when heating.
After the user sets indoor temperature, start air-conditioning.At this moment, compressor is got sum total after calculating each chamber load of each indoor heat converter, calculates the total load amount, and self power adjusting is become to conform to it.The electromagnetic expanding valve that is connected with each indoor heat converter, according to above-mentioned each chamber load, decision initial pulse value, the refrigerant influx of regulating each indoor heat converter.
Behind compressor discharge and the corresponding coolant quantity of above-mentioned total load amount, electromagnetic expanding valve is according to above-mentioned initial pulse value, determine the refrigerant influx of each indoor heat converter, allow the refrigerant of each chamber load corresponding amount flow in each indoor heat converter, carry out heat exchange (condensation) with room air.Refrigerant after the above-mentioned heat exchange becomes the refrigerant of low-temp low-pressure when flowing through electromagnetic expanding valve.When the refrigerant of above-mentioned low-temp low-pressure flows through outdoor heat converter, carry out heat exchange (evaporation) with outdoor air.Air-conditioning is by carrying out said process repeatedly, heats operation to indoor.
At this moment, control part carries out the judgement in cycle to current indoor temperature and design temperature difference.If indoor temperature is higher than user's design temperature, such as 4C, be judged as superheat state (please refer to A), then the control impuls value that is used to control the electromagnetic expanding valve openness is reduced " 8 " pulse, allow the refrigerant influx of indoor heat converter significantly reduce.Along with the minimizing of refrigerant influx, indoor temperature is decline ((b) part) fast.
Minimizing along with coolant quantity, in the process ((b) part) that indoor temperature reduces, control part continues the difference of Current Temperatures and design temperature is calculated, when said temperature is lower than design temperature, calculate its temperature difference after, if indoor temperature is lower than below the design temperature 4C, then be judged as and be in overload, with the pulse value of " 6 " pulse minimizing electromagnetic expanding valve, the degree of opening of regulating electromagnetic expanding valve allows the refrigerant influx of indoor heat converter significantly increase.Thereby, can improve indoor temperature ((c) part) fast.
Carry out as the next stage afterwards.That is, press some cycles, the stage that the difference of indoor temperature and design temperature is judged; And, increase or reduce the control impuls value of electromagnetic expanding valve according to the temperature difference in above-mentioned judgement stage, its openness is regulated the stage that the refrigerant influx of indoor heat converter is controlled.By carrying out the above-mentioned stage repeatedly, can reduce the poor of design temperature and indoor temperature fast, allow indoor temperature to design temperature adjustment ((d) part).
As shown in Figure 7, among the present invention, behind the operation of air conditioner, indoor temperature is adjusted to design temperature, and the time of being consumed when obtaining stablizing (T2), far below the time of being consumed in the conventional art (please refer to the T1 of Fig. 2).And in the conventional art, indoor temperature does not obtain real adjustment, but floats within the specific limits.But among the present invention, indoor temperature can well be adjusted.
Claims (5)
1, a kind of control method of central air-conditioning electromagnetic expanding valve is characterized in that: comprises and measures indoor temperature and design temperature, and the stage that compares;
The stage that difference between indoor temperature and the design temperature is calculated;
If the said temperature difference is big, then significantly increase and decrease the pulse value of electric expansion valve, its openness is regulated, if the said temperature difference is little, then slightly increase and decrease the pulse value of electric expansion valve, the stage that its openness is regulated.
2, the control method of central air-conditioning electromagnetic expanding valve according to claim 1 is characterized in that:
If the said temperature difference is greater than 4 ℃, then above-mentioned control impuls value increase and decrease " 8 " pulse, if the said temperature difference is greater than 3 ℃, less than 4 ℃, then above-mentioned control impuls value increase and decrease " 6 " pulse, if the said temperature difference is greater than 2 ℃, less than 3 ℃, then above-mentioned control impuls value increase and decrease " 4 " pulse, if the said temperature difference is greater than 1 ℃, less than 2 ℃, then above-mentioned control impuls value increase and decrease " 2 " pulse, if the said temperature difference is less than 1 ℃, then above-mentioned control impuls value increase and decrease " 0 " pulse.
3, the control method of central air-conditioning electromagnetic expanding valve according to claim 1 is characterized in that:
When carrying out heating operation, the temperature difference according to both when above-mentioned design temperature is higher than indoor temperature increases above-mentioned control impuls value, and above-mentioned design temperature when being lower than indoor temperature the temperature difference according to both reduce above-mentioned control impuls value; Temperature difference according to both when above-mentioned design temperature is higher than indoor temperature when carrying out refrigerating operaton reduces above-mentioned control impuls value, and above-mentioned design temperature when being lower than indoor temperature the temperature difference according to both increase above-mentioned control impuls value.
4, the control method of central air-conditioning electromagnetic expanding valve according to claim 1 is characterized in that:
Carry out heating operation, and when design temperature is higher than indoor temperature, if the said temperature difference is greater than 4 ℃, then above-mentioned control impuls value is increased " 8 " pulse, if the said temperature difference is greater than 3 ℃, less than 4 ℃, then above-mentioned control impuls value is increased " 6 " pulse, if the said temperature difference is greater than 2 ℃, less than 3 ℃, then above-mentioned control impuls value increase and decrease " 4 " pulse, if the said temperature difference is greater than 1 ℃, less than 2 ℃, then above-mentioned control impuls value is increased " 2 " pulse, if the said temperature difference less than 1 ℃, then increases " 0 " pulse to above-mentioned control impuls value.
5, the control method of central air-conditioning electromagnetic expanding valve according to claim 1 is characterized in that:
Carry out heating operation, and when design temperature is not higher than indoor temperature, if the said temperature difference is greater than 4 ℃, then above-mentioned control impuls value is reduced " 8 " pulse, if the said temperature difference is greater than 3 ℃, less than 4 ℃, then above-mentioned control impuls value is reduced " 6 " pulse, if the said temperature difference is greater than 2 ℃, less than 3 ℃, then above-mentioned control impuls value is reduced " 4 " pulse, if the said temperature difference is greater than 1 ℃, less than 2 ℃, then above-mentioned control impuls value is reduced " 2 " pulse, if the said temperature difference less than 1 ℃, then reduces " 0 " pulse to above-mentioned control impuls value.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200410093764 CN1782571A (en) | 2004-11-30 | 2004-11-30 | Electromagnetic expansion valve control method of central air conditioner |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200410093764 CN1782571A (en) | 2004-11-30 | 2004-11-30 | Electromagnetic expansion valve control method of central air conditioner |
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| CN1782571A true CN1782571A (en) | 2006-06-07 |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101889175A (en) * | 2007-12-04 | 2010-11-17 | 庆东网络株式会社 | Method for controlling heating system |
| CN104329771A (en) * | 2014-10-08 | 2015-02-04 | 美的集团股份有限公司 | Control method and system of air conditioner as well as air conditioner |
| CN105588273A (en) * | 2015-09-30 | 2016-05-18 | 青岛海信日立空调系统有限公司 | Control method for opening degree of electronic expansion valves, indoor unit, outdoor unit and air-conditioner |
| CN110848852A (en) * | 2019-11-29 | 2020-02-28 | 广东美的制冷设备有限公司 | Air conditioner and control method and control device thereof |
| CN112443901A (en) * | 2019-08-29 | 2021-03-05 | 日立江森自控空调有限公司 | Refrigeration cycle system, method for controlling refrigeration cycle system, and controller for refrigeration cycle system |
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2004
- 2004-11-30 CN CN 200410093764 patent/CN1782571A/en active Pending
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101889175A (en) * | 2007-12-04 | 2010-11-17 | 庆东网络株式会社 | Method for controlling heating system |
| CN101889175B (en) * | 2007-12-04 | 2014-04-30 | 庆东元株式会社 | Method for controlling heating system |
| CN104329771A (en) * | 2014-10-08 | 2015-02-04 | 美的集团股份有限公司 | Control method and system of air conditioner as well as air conditioner |
| CN104329771B (en) * | 2014-10-08 | 2017-11-10 | 美的集团股份有限公司 | Control method, system and the air conditioner of air conditioner |
| CN105588273A (en) * | 2015-09-30 | 2016-05-18 | 青岛海信日立空调系统有限公司 | Control method for opening degree of electronic expansion valves, indoor unit, outdoor unit and air-conditioner |
| CN105588273B (en) * | 2015-09-30 | 2018-10-09 | 青岛海信日立空调系统有限公司 | A kind of aperture control method, indoor unit, outdoor unit and the air-conditioning of electric expansion valve |
| CN112443901A (en) * | 2019-08-29 | 2021-03-05 | 日立江森自控空调有限公司 | Refrigeration cycle system, method for controlling refrigeration cycle system, and controller for refrigeration cycle system |
| CN110848852A (en) * | 2019-11-29 | 2020-02-28 | 广东美的制冷设备有限公司 | Air conditioner and control method and control device thereof |
| CN110848852B (en) * | 2019-11-29 | 2021-10-26 | 广东美的制冷设备有限公司 | Air conditioner and control method and control device thereof |
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