CN103851847A - System and method for controlling electronic expansion valve of air conditioner, and multi-split air conditioner outdoor unit - Google Patents
System and method for controlling electronic expansion valve of air conditioner, and multi-split air conditioner outdoor unit Download PDFInfo
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- CN103851847A CN103851847A CN201210514698.XA CN201210514698A CN103851847A CN 103851847 A CN103851847 A CN 103851847A CN 201210514698 A CN201210514698 A CN 201210514698A CN 103851847 A CN103851847 A CN 103851847A
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Abstract
The invention is applicable to an air conditioner control technology and provides a system for controlling an electronic expansion valve of an air conditioner. The system comprises a system starting unit, a superheat degree acquisition unit, and a judgment and regulation unit, wherein the system starting unit is used for opening the electronic expansion valve based on initial openness according to the environment temperature; the superheat degree acquisition unit is used for acquiring the exhaust temperature superheat degree of a compressor regularly; the judgment and regulation unit is used for judging whether the exhaust temperature superheat degree is within a preset reasonable temperature range and regulating the initial openness based on preset regulation amplitude when the exhaust temperature superheat degree is not within the preset reasonable temperature range, thus to enable the exhaust temperature superheat degree of the compressor to be within the preset reasonable temperature range. The system for controlling the electronic expansion valve of the air conditioner has the advantages that the openness of the electronic expansion valve is adjusted according to the exhaust temperature superheat degree of the compressor; due to larger permissible error range of the exhaust temperature superheat degree, the openness of the compressor cannot deviate from the optimum openness even if errors are smaller, so that a multi-split air conditioner system can be keep well operating under an optimum state.
Description
Technical field
The invention belongs to air conditioner controlling technology field, relate in particular to a kind of air conditioner electronic expansion valve control system, control method and apply the multi-gang air-conditioner off-premises station of this electric expansion valve.
Background technology
At present, electric expansion valve can carry out accurately controlling and the suitable cost throttle part of machine use outside multi-connected machine widely to refrigerant flow using it, and therefore, a kind of suitable electronic expansion valve controls mode seems particularly important in multi-connected machine system.And under actual some service condition of unit and combination inappropriate electronic expansion valve opening, can cause the delivery temperature of compressor lower, cause the band hydraulic compression of compressor, and its long-term operation will cause greatly infringement to the scroll plate of compressor; Or in system, the delivery temperature of compressor again likely can be very high, not only causes the operation of system high energy consumption, also can have to lubricating oil in system the danger of carbonization cracking.
The operation control method of traditional electric expansion valve is by detecting the suction temperature degree of superheat that compressor return air mouth temperature and system evaporator temperature control compressor in a rational scope, and detect delivery temperature value simultaneously, make its delivery temperature value not higher than certain setting value of 55-65 ℃ by the control of off-premises station electric expansion valve.The core of this control mode is to control the electric expansion valve of outer machine by the return-air degree of superheat, and in service in actual low-temperature heating operating mode, the detection of the temperature-sensitive bag of return-air temperature-sensitive bag and outside evaporimeter all exists error; And system is more responsive to actual return-air degree of superheat reaction, and less detection error amount can more easily make system depart from optimum running status.And the delivery temperature value of setting is higher than some setting values of 55-65 ℃ under different operating mode combinations, and the system that can not guarantee is an optimum operating point.
Summary of the invention
The object of the embodiment of the present invention is to provide a kind of air conditioner electronic expansion valve control system being applied on multi-connected machine off-premises station, is intended to solve the detection error amount that traditional control mode is less and can easily makes system depart from the problem of optimum running status.
The present invention realizes like this, a kind of air conditioner electronic expansion valve control system, it is applied on the off-premises station of multi-connected machine, is electrically connected with the electric expansion valve in off-premises station, in order to control and to regulate the aperture of this electric expansion valve, described air conditioner electronic expansion valve control system comprises:
System start unit, for opening electric expansion valve according to environment temperature with initial opening;
Degree of superheat acquiring unit, for the delivery temperature degree of superheat of timing acquisition compressor;
Judge regulon, whether presetting within the scope of reasonable temperature for the delivery temperature degree of superheat that judges described compressor, and regulate described initial opening to preset the amplitude of accommodation in the time that the described delivery temperature degree of superheat is not within the scope of default reasonable temperature, so that the delivery temperature degree of superheat of described compressor is got back within the scope of described default reasonable temperature.
Above-mentioned air conditioner electronic expansion valve control system is adjusted the aperture of electric expansion valve according to the delivery temperature degree of superheat of compressor, because the allowable error scope of the delivery temperature degree of superheat is larger, exist less error also can not make optimum aperture of departing from of compressor even if realized, make multi-online air-conditioning system can remain on well optimum running status.
The control method that another object of the present invention is to provide a kind of described air conditioner electronic expansion valve control system, comprises the following steps:
According to environment temperature, electric expansion valve is opened with initial opening;
The delivery temperature degree of superheat of timing acquisition compressor;
Judge that the described delivery temperature degree of superheat, whether presetting within the scope of reasonable temperature, if not, regulates described initial opening that the described delivery temperature degree of superheat is got back within the scope of described default reasonable temperature to preset the amplitude of accommodation.
Above-mentioned control method for electronic expansion valve of air conditioner is adjusted the aperture of electric expansion valve according to the delivery temperature degree of superheat of compressor, because the allowable error scope of the delivery temperature degree of superheat is larger, exist less error also can not make optimum aperture of departing from of compressor even if realized, make multi-online air-conditioning system can remain on well optimum running status.
In addition, also provide a kind of multi-gang air-conditioner off-premises station, the electronic expansion valve controls system that it comprises compressor, electric expansion valve, is electrically connected with this electric expansion valve; This electronic expansion valve controls system comprises:
System start unit, for opening electric expansion valve according to environment temperature with initial opening;
Degree of superheat acquiring unit, for the delivery temperature degree of superheat of timing acquisition compressor;
Judge regulon, whether presetting within the scope of reasonable temperature for the delivery temperature degree of superheat that judges described compressor, and regulate described initial opening to preset the amplitude of accommodation in the time that the described delivery temperature degree of superheat is not within the scope of default reasonable temperature, so that the delivery temperature degree of superheat of described compressor is got back within the scope of described default reasonable temperature.
Above-mentioned multi-gang air-conditioner outdoor machine system is adjusted the aperture of electric expansion valve according to the delivery temperature degree of superheat of compressor, because the allowable error scope of the delivery temperature degree of superheat is larger, exist less error also can not make optimum aperture of departing from of compressor even if realized, make multi-online air-conditioning system can remain on well optimum running status.
Accompanying drawing explanation
Fig. 1 is the module map of air conditioner electronic expansion valve control system provided by the invention;
Fig. 2 is the structural representation of air-conditioner outdoor unit provided by the invention;
Fig. 3 is the module map of degree of superheat acquiring unit provided by the invention;
Fig. 4 is the module map of judgement regulon provided by the invention;
Fig. 5 is the workflow diagram of the embodiment of the present invention one control method for electronic expansion valve of air conditioner;
Fig. 6 is the workflow diagram of the delivery temperature degree of superheat of obtaining compressor that provides of the embodiment of the present invention two;
Fig. 7 is the workflow diagram of the embodiment of the present invention three control method for electronic expansion valve of air conditioner.
The specific embodiment
In order to make the technical problem to be solved in the present invention, technical scheme and beneficial effect clearer, below in conjunction with drawings and Examples, the present invention is further elaborated.Should be appreciated that specific embodiment described herein, only in order to explain the present invention, is not intended to limit the present invention.
Shown in Fig. 1,2, electronic expansion valve controls system 500 on a kind of off-premises station 100 that is applied to air-conditioning or multi-gang air-conditioner is provided, this control system 500 is electrically connected with the electric expansion valve 110 in off-premises station 100, in order to control and to regulate the aperture of this electric expansion valve.This electronic expansion valve controls system 500 comprises system start unit 510, degree of superheat acquiring unit 520 and judges regulon 530.
Above-mentioned air conditioner electronic expansion valve control system 500 is adjusted the aperture of electric expansion valve 110 according to the delivery temperature degree of superheat Tn of compressor 101, because the allowable error scope of delivery temperature degree of superheat Tn is larger, exist less error also can not make optimum aperture of departing from of compressor 101 even if realized, make air-conditioning air-conditioning system can remain on well optimum running status.
The operational mode that the environment temperature that system start unit 510 first detects and air-conditioning system are set is determined a suitable electric expansion valve initial opening N0, the for example aperture of 280 steps, air-conditioning system and electric expansion valve can reach a stable running status after start a period of time.
Degree of superheat acquiring unit 520 obtains and draws the delivery temperature degree of superheat according to the average exhaust Ta of the pressure at expulsion Pd of compressor 101 and compressor 101.Please also refer to Fig. 3, in a preferred embodiment, comprise saturation temperature acquisition module 522 and degree of superheat computing module 524.
Saturation temperature acquisition module 522 is for obtaining the pressure at expulsion Pd of Preset Time inner compressor 101, obtain corresponding saturation temperature Ts according to described pressure at expulsion Pd, in the present embodiment, with reference to figure 7, utilize compressor discharge pressure sensor 103 to detect the pressure at expulsion Pd of compressor 101, find the saturation temperature Ts under this pressure at expulsion Pd according to the cold-producing medium parameter list of air-conditioning system prepackage cold-producing medium.And in actual conditions, air-conditioning system is preset in this refrigeration parameter list in control system, in the process of system operation, can search and call.
Degree of superheat computing module 524 is for obtaining the average exhaust Ta of Preset Time inner compressor 101, and obtain the described delivery temperature degree of superheat by the difference of this average exhaust and saturation temperature, be basis: delivery temperature degree of superheat Tn=average exhaust Ta-saturation temperature Ts, obtains described delivery temperature degree of superheat Tn.In the present embodiment, with reference to figure 3, the delivery temperature T (T1, the T2 that utilize compressor exhaust temperature sensor 102 to detect compressor 101 to open ...), this certain time interval can be 100ms, 500ms, 1s, 2S or 5S equal time, mean value Ta(Ta=(the T1+T2+ of the delivery temperature T of all unlatching compressors 101 ... Tn)/n), draw the compressor exhaust temperature degree of superheat Tn=Ta-Ts in current air-conditioning system.
Judge that regulon 530 first carries out the whether function within the scope of default reasonable temperature of the delivery temperature degree of superheat for judging compressor 101.Particularly, in the present embodiment, the Optimal Temperature of the compressor 101 delivery temperature degrees of superheat is to set according to the recommended parameter of the empirical data of industry and compressor manufacturer, the delivery temperature degree of superheat Optimal Temperature of the compressor 101 in the present embodiment is T0:25 ℃, its allowable error scope is 5 ℃, optimum rationally delivery temperature degree of superheat scope is 20 ℃ to 30 ℃, or 20 ± 3 ℃ to 30 ± 3 ℃, be in the present embodiment, default reasonable temperature scope is 20 ℃ to 30 ℃, or be 20 ± 3 ℃ to 30 ± 3 ℃, related embodiment below will be described take this temperature range as example.In other embodiments, according to the difference of compressor function parameter, default reasonable temperature scope can be set to as 15 ℃ to 35 ℃, 18 ℃ to 28 ℃ equitemperature scopes.
In a preferred embodiment, please refer to Fig. 4, judge that regulon 530 comprises that the first judgement adjustment module 532 and second judges adjustment module 534.
First judges that adjustment module 532 is for judging whether the delivery temperature degree of superheat Tn of described compressor 101 is greater than default reasonable temperature scope, and be greater than default reasonable temperature in the delivery temperature degree of superheat of this compressor 101, according to the delivery temperature degree of superheat Tn of current compressor 101 accordingly the default amplitude of accommodation increase the initial opening of described electric expansion valve 110.As shown in table 1 in the present embodiment, for example, in the time detecting delivery temperature degree of superheat Tn >=T0+b, first judges the action that large n4 is opened electric expansion valve 110 in 532 execution of adjustment module, now, the internal circulating load that adds refrigerant in conference increasing air-conditioning system of electric expansion valve 110 apertures, thus delivery temperature and delivery temperature degree of superheat Tn effectively reduced.
Table 1:
If the delivery temperature degree of superheat Tn of described compressor 101 is not more than default reasonable temperature scope, second judges that adjustment module 534 is for judging whether the delivery temperature degree of superheat Tn of described compressor 101 is less than greatly default reasonable temperature scope, and be less than default reasonable temperature in the delivery temperature degree of superheat of this compressor 101, according to the delivery temperature degree of superheat Tn of current compressor 101 accordingly the default amplitude of accommodation reduce the initial opening of described electric expansion valve 110, if not, finish to regulate.Particularly, as shown in table 1, in the time Tn < T0-d being detected, second judges that electric expansion valve 110 apertures are turned down n1(60 step by 534 execution of adjustment module) action, now, the internal circulating load that reduces to reduce refrigerant in air-conditioning system of electric expansion valve 110 apertures, thus delivery temperature and the delivery temperature degree of superheat Tn of compressor 101 effectively increased.
In fact, it is to arrange according to the size of delivery temperature degree of superheat Tn that the default amplitude of accommodation regulates, in the present embodiment, shown in corresponding table 1, T0 is set as 25 ℃, and simultaneously by a, b, c, the value of d is set to respectively 5 ℃, and 15 ℃, 5 ℃, 15 ℃, n1, n2, n3, n4 can be set to respectively to 60 steps, 30 steps, 30 steps, 60 steps.Delivery temperature degree of superheat Tn is respectively with the corresponding default amplitude of accommodation: if delivery temperature degree of superheat Tn >=40 ℃, the default amplitude of accommodation is+60 steps, increases 60 steps; If 40 ℃ of 30 ℃≤delivery temperature degree of superheat Tn <, the default amplitude of accommodation is+30 steps, increases 30 steps; If 20 ℃ of 10 ℃≤delivery temperature degree of superheat Tn <, the default amplitude of accommodation is-30 steps, reduces by 30 steps; If 10 ℃ of delivery temperature degree of superheat Tn <, the default amplitude of accommodation is-60 steps, reduces by 30 steps.In other embodiments, according to the systematic parameter difference of air-conditioning system, this default amplitude of accommodation should be set according to actual conditions, is not defined as the above-mentioned amplitude of accommodation.
The above-mentioned pressure at expulsion Pd that utilizes compressor 110 obtains corresponding saturation temperature Ts, the exhaust temperature overheating degree Tn calculating according to the average exhaust Ta of certain hour inner compressor 110 again, system is controlled at the delivery temperature degree of superheat Tn that opens compressor in a default rational scope, guarantee like this system high energy efficiency and stable operation, prevented from opening in system the too low Wet Compression causing of compressor exhaust temperature Tn or excessive discharge temperature and caused the carbonization harm to lubricating oil.
In addition, also provide a kind of control method for electronic expansion valve of air conditioner, it can be for controlling or regulate air-conditioning system or multi-online air-conditioning system.
Embodiment mono-
As shown in Figure 5, for workflow diagram, this control method is mainly used in controlling the outer machine work of multi-gang air-conditioner, control method for electronic expansion valve of air conditioner comprises the following steps:
Step S100, opens electric expansion valve according to environment temperature with initial opening.Particularly, the operational mode of first being set by the environment temperature detecting and air-conditioning system is determined a suitable electric expansion valve initial opening N0, the for example aperture of 280 steps, air-conditioning system and electric expansion valve can reach a stable running status after start a period of time.
Step S200, the delivery temperature degree of superheat of timing acquisition compressor.Particularly, the pressure at expulsion Pd(that air-conditioning system detects compressor according to certain time interval is the pressure at expulsion of air-conditioning system) and the delivery temperature T (T1 of compressor that opens, T2 ...), this certain time interval can be 100ms, 500ms, 1s, 2S or 5S equal time, find the saturation temperature Ts under this pressure at expulsion Pd according to the cold-producing medium parameter list of air-conditioning system prepackage cold-producing medium, and the mean value Ta(Ta=(T1+T2+ of the delivery temperature T of all unlatching compressors ... Tn)/n), draw the compressor exhaust temperature degree of superheat Tn=Ta-Ts in current air-conditioning system.And in actual conditions, air-conditioning system is preset in this refrigeration parameter list in control system, in the process of system operation, can search and call.
Step S300, judges whether the described delivery temperature degree of superheat is being preset within the scope of reasonable temperature.Particularly, in the present embodiment, the Optimal Temperature of the delivery temperature degree of superheat of compressor is to set according to the recommended parameter of the empirical data of industry and compressor manufacturer, compressor exhaust temperature degree of superheat Optimal Temperature in the present embodiment is T0:25 ℃, its allowable error scope is 5 ℃, optimum rationally delivery temperature degree of superheat scope is 20 ℃ to 30 ℃, or 20 ± 3 ℃ to 30 ± 3 ℃, be in the present embodiment, default reasonable temperature scope is 20 ℃ to 30 ℃, or 20 ± 3 ℃ to 30 ± 3 ℃, related embodiment below will be described take this temperature range as example.In other embodiments, according to the difference of compressor function parameter, default reasonable temperature scope can be set to as 15 ℃ to 35 ℃, 18 ℃ to 28 ℃ equitemperature scopes.
Step S400, if the delivery temperature degree of superheat is not within the scope of default reasonable temperature, regulates described initial opening that the described delivery temperature degree of superheat is got back within the scope of described default reasonable temperature to preset the amplitude of accommodation.Particularly, as shown in table 1, for example, in the time detecting delivery temperature degree of superheat Tn >=T0+b, controller is carried out the action of electric expansion valve being opened to large n4, now, the internal circulating load that adds refrigerant in conference increasing air-conditioning system of electronic expansion valve opening, thus delivery temperature and the delivery temperature degree of superheat effectively reduced.In like manner, and in the time Tn < T0-d being detected, controller is carried out electronic expansion valve opening is turned down to n1(60 step) action, now, the internal circulating load that reduces to reduce refrigerant in air-conditioning system of electronic expansion valve opening, thus delivery temperature and the delivery temperature degree of superheat of compressor effectively increased;
It is to arrange according to the size of the delivery temperature degree of superheat that the default amplitude of accommodation regulates, in the present embodiment, shown in corresponding table 1, T0 is set as 25 ℃, and simultaneously by a, b, c, the value of d is set to respectively 5 ℃, 15 ℃, 5 ℃, 15 ℃, n1, n2, n3, n4 can be set to respectively to 60 steps, 30 steps, 30 steps, 60 steps.The delivery temperature degree of superheat meets following relation with the corresponding default amplitude of accommodation: if the delivery temperature degree of superheat >=40 ℃, the default amplitude of accommodation is+60 steps, increases 60 steps; If the 30 ℃≤delivery temperature degree of superheat is greater than 40 ℃ of <, the default amplitude of accommodation is+30 steps, increases 30 steps; If the 10 ℃≤delivery temperature degree of superheat is greater than 20 ℃ of <, the default amplitude of accommodation is-30 steps, reduces by 30 steps; If 10 ℃ of delivery temperature degree of superheat <, the default amplitude of accommodation is-60 steps, reduces by 30 steps.In other embodiments, according to the systematic parameter difference of air-conditioning system, this default amplitude of accommodation should be set according to actual conditions, is not defined as the above-mentioned amplitude of accommodation.
Above-mentioned control method for electronic expansion valve of air conditioner, adjust the aperture of electric expansion valve according to the delivery temperature degree of superheat of compressor, because the allowable error scope of the delivery temperature degree of superheat is larger, exist less error also can not make optimum aperture of departing from of compressor even if realized, make air-conditioning air-conditioning system can remain on well optimum running status.
Embodiment bis-
As shown in Figure 6, step S200 comprises step S210 and step S220.
Step S210, obtains the pressure at expulsion of Preset Time inner compressor, obtains corresponding saturation temperature Ts according to described pressure at expulsion.Utilize compressor discharge pressure sensor to detect the pressure at expulsion Pd of compressor, find the saturation temperature Ts under this pressure at expulsion Pd according to the cold-producing medium parameter list of air-conditioning system prepackage cold-producing medium.And in actual conditions, air-conditioning system is preset in this refrigeration parameter list in control system, in the process of system operation, can search and call.
Step S220, obtains the average exhaust of Preset Time inner compressor, and obtains the described delivery temperature degree of superheat, i.e. the delivery temperature degree of superheat=average exhaust-saturation temperature by the difference of this average exhaust and saturation temperature.Utilize compressor exhaust temperature sensor to detect delivery temperature T (T1, T2 that compressor is opened ...), this certain time interval can be 100ms, 500ms, 1s, 2S or 5S equal time, the mean value Ta(Ta=(T1+T2+ of the delivery temperature T of all unlatching compressors ... Tn)/n), draw the compressor exhaust temperature degree of superheat Tn=Ta-Ts in current air-conditioning system.
Embodiment tri-
In embodiments of the invention three, step S100 and step S200 and embodiment mono-or embodiment bis-are identical, and step S300 and S400 be difference to some extent.
As shown in Figure 7, step S300 comprises step S301 and step S302, and step S400 comprises step S401 and step S402.
Step S301, judge whether the described delivery temperature degree of superheat is greater than default reasonable temperature scope, if the described delivery temperature degree of superheat is greater than default reasonable temperature scope, perform step S401, increase described initial opening according to presetting accordingly the amplitude of accommodation with the current delivery temperature degree of superheat.As shown in Table 1, for example, in the time detecting delivery temperature degree of superheat Tn >=T0+b, controller is carried out the action of electric expansion valve being opened to large n4, now, the internal circulating load that adds refrigerant in conference increasing air-conditioning system of electronic expansion valve opening, thus delivery temperature and the delivery temperature degree of superheat effectively reduced.
If the described delivery temperature degree of superheat is not more than default reasonable temperature scope, perform step S302, judge whether the described delivery temperature degree of superheat is less than default reasonable temperature scope, if the described delivery temperature degree of superheat is less than default reasonable temperature scope, perform step S402, reduce described initial opening according to presetting accordingly the amplitude of accommodation with the current delivery temperature degree of superheat; If not, finish to regulate.Particularly, as shown in table 1, in the time Tn < T0-d being detected, controller is carried out electronic expansion valve opening is turned down to n1(60 step) action, now, the internal circulating load that reduces to reduce refrigerant in air-conditioning system of electronic expansion valve opening, thus delivery temperature and the delivery temperature degree of superheat of compressor effectively increased.
In fact, it is to arrange according to the size of the delivery temperature degree of superheat that the default amplitude of accommodation regulates, in the present embodiment, shown in corresponding table 1, T0 is set as 25 ℃, and simultaneously by a, b, c, the value of d is set to respectively 5 ℃, and 15 ℃, 5 ℃, 15 ℃, n1, n2, n3, n4 can be set to respectively to 60 steps, 30 steps, 30 steps, 60 steps.The delivery temperature degree of superheat meets following relation with the corresponding default amplitude of accommodation: if the delivery temperature degree of superheat >=40 ℃, the default amplitude of accommodation is+60 steps, increases 60 steps; If 40 ℃ of 30 ℃≤delivery temperature degree of superheat <, the default amplitude of accommodation is+30 steps, increases 30 steps; If 20 ℃ of 10 ℃≤delivery temperature degree of superheat <, the default amplitude of accommodation is-30 steps, reduces by 30 steps; If 10 ℃ of delivery temperature degree of superheat <, the default amplitude of accommodation is-60 steps, reduces by 30 steps.In other embodiments, according to the systematic parameter difference of air-conditioning system, this default amplitude of accommodation should be set according to actual conditions, is not defined as the above-mentioned amplitude of accommodation.
Above-mentioned control method for electronic expansion valve of air conditioner utilizes the pressure at expulsion Pd of compressor to obtain corresponding saturation temperature Ts, the exhaust temperature overheating degree Tn calculating according to the average exhaust Ta of certain hour inner compressor again, system is controlled at the delivery temperature degree of superheat Tn that opens compressor in a default rational scope, guarantee like this system high energy efficiency and stable operation, prevented from opening in system the too low Wet Compression causing of compressor exhaust temperature Tn or excessive discharge temperature and caused the carbonization harm to lubricating oil.
In addition, also provide a kind of multi-gang air-conditioner off-premises station, as shown in Figure 1, 2, the electronic expansion valve controls system that it comprises compressor, electric expansion valve, is electrically connected with this electric expansion valve; This electronic expansion valve controls system 500 comprises system start unit 510, degree of superheat acquiring unit 520 and judges regulon 530.
The control system 500 of the electric expansion valve 110 of above-mentioned multi-gang air-conditioner off-premises station is by adjusting the aperture of electric expansion valve 110 according to the delivery temperature degree of superheat Tn of compressor 101, because the allowable error scope of delivery temperature degree of superheat Tn is larger, even if exist less error also can not make optimum aperture of departing from of compressor 101 while realization, make multi-online air-conditioning system can remain on well optimum running status.
In fact, the operational mode that the environment temperature that system start unit 510 first detects and multi-online air-conditioning system are set is determined a suitable electric expansion valve initial opening N0, the for example aperture of 280 steps, multi-online air-conditioning system and electric expansion valve can reach a stable running status after start a period of time.
Degree of superheat acquiring unit 520 obtains and draws the delivery temperature degree of superheat according to the average exhaust Ta of the pressure at expulsion Pd of compressor 101 and compressor 101.Please also refer to Fig. 3, in a preferred embodiment, degree of superheat acquiring unit 520 comprises saturation temperature acquisition module 522 and degree of superheat computing module 524.
Saturation temperature acquisition module 522 is for obtaining the pressure at expulsion Pd of Preset Time inner compressor 101, obtain corresponding saturation temperature Ts according to described pressure at expulsion Pd, in the present embodiment, with reference to figure 7, utilize compressor discharge pressure sensor 103 to detect the pressure at expulsion Pd of compressor 101, find the saturation temperature Ts under this pressure at expulsion Pd according to the cold-producing medium parameter list of multi-online air-conditioning system prepackage cold-producing medium.And in actual conditions, multi-online air-conditioning system is preset in this refrigeration parameter list in control system, in the process of system operation, can search and call.
Degree of superheat computing module 524 is for obtaining the average exhaust Ta of Preset Time inner compressor 101, and obtain the described delivery temperature degree of superheat by the difference of this average exhaust and saturation temperature, be basis: delivery temperature degree of superheat Tn=average exhaust Ta-saturation temperature Ts, obtains described delivery temperature degree of superheat Tn.In the present embodiment, with reference to figure 6, the delivery temperature T (T1, the T2 that utilize compressor exhaust temperature sensor 102 to detect compressor 101 to open ...), this certain time interval can be 100ms, 500ms, 1s, 2S or 5S equal time, mean value Ta(Ta=(the T1+T2+ of the delivery temperature T of all unlatching compressors 101 ... Tn)/n), draw the compressor exhaust temperature degree of superheat Tn=Ta-Ts in current multi-connected machine system.
Preferably, whether degree of superheat acquiring unit 520 first carries out the delivery temperature degree of superheat that is used for judging compressor 101 in the function of presetting within the scope of reasonable temperature.Particularly, in the present embodiment, the Optimal Temperature of the compressor 101 delivery temperature degrees of superheat is to set according to the recommended parameter of the empirical data of industry and compressor manufacturer, the delivery temperature degree of superheat Optimal Temperature of the compressor 101 in the present embodiment is T0:25 ℃, its allowable error scope is 5 ℃, optimum rationally delivery temperature degree of superheat scope is 20 ℃ to 30 ℃, or 20 ± 3 ℃ to 30 ± 3 ℃, be in the present embodiment, default reasonable temperature scope is 20 ℃ to 30 ℃, or be 20 ± 3 ℃ to 30 ± 3 ℃, related embodiment below will be described take this temperature range as example.In other embodiments, according to the difference of compressor function parameter, default reasonable temperature scope can be set to as 15 ℃ to 35 ℃, 18 ℃ to 28 ℃ equitemperature scopes.
In a preferred embodiment, with reference to figure 4, described judgement regulon 530 comprises that the first judgement adjustment module 532 and second judges adjustment module 534.
First judges that adjustment module 532 is for judging whether the delivery temperature degree of superheat Tn of described compressor 101 is greater than default reasonable temperature scope, and be greater than default reasonable temperature in the delivery temperature degree of superheat of this compressor, according to current delivery temperature degree of superheat Tn accordingly the default amplitude of accommodation increase the initial opening of described electric expansion valve 110.As shown in table 1 in the present embodiment, for example, in the time detecting delivery temperature degree of superheat Tn >=T0+b, first judges the action that large n4 is opened electric expansion valve 110 in 532 execution of adjustment module, now, the internal circulating load that adds refrigerant in conference increasing multi-connected machine system of electric expansion valve 110 apertures, thus delivery temperature and delivery temperature degree of superheat Tn effectively reduced.
If the delivery temperature degree of superheat Tn of described compressor 101 is not more than default reasonable temperature scope, second judges that adjustment module 534 is for judging whether the delivery temperature degree of superheat Tn of described compressor 101 is less than greatly default reasonable temperature scope, and be less than default reasonable temperature in the delivery temperature degree of superheat of this compressor, according to current delivery temperature degree of superheat Tn accordingly the default amplitude of accommodation reduce the initial opening of described electric expansion valve 110, if not, finish to regulate.Particularly, as shown in table 1, in the time Tn < T0-d being detected, second judges that electric expansion valve 110 apertures are turned down n1(60 step by 534 execution of adjustment module) action, now, the internal circulating load that reduces to reduce refrigerant in multi-connected machine system of electric expansion valve 110 apertures, thus delivery temperature and the delivery temperature degree of superheat Tn of compressor 101 effectively increased.
In fact, it is to arrange according to the size of delivery temperature degree of superheat Tn that the default amplitude of accommodation regulates, in the present embodiment, shown in corresponding table 1, T0 is set as 25 ℃, and simultaneously by a, b, c, the value of d is set to respectively 5 ℃, and 15 ℃, 5 ℃, 15 ℃, n1, n2, n3, n4 can be set to respectively to 60 steps, 30 steps, 30 steps, 60 steps.Delivery temperature degree of superheat Tn is respectively with the corresponding default amplitude of accommodation: if delivery temperature degree of superheat Tn >=40 ℃, the default amplitude of accommodation is+60 steps, increases 60 steps; If 40 ℃ of 30 ℃≤delivery temperature degree of superheat Tn <, the default amplitude of accommodation is+30 steps, increases 30 steps; If 20 ℃ of 10 ℃≤delivery temperature degree of superheat Tn <, the default amplitude of accommodation is-30 steps, reduces by 30 steps; If 10 ℃ of delivery temperature degree of superheat Tn <, the default amplitude of accommodation is-60 steps, reduces by 30 steps.In other embodiments, according to the systematic parameter difference of multi-connected machine system, this default amplitude of accommodation should be set according to actual conditions, is not defined as the above-mentioned amplitude of accommodation.
Above-mentioned air conditioner electronic expansion valve control system, control method and the multi-gang air-conditioner off-premises station of applying this electric expansion valve utilize the pressure at expulsion Pd of compressor 110 to obtain corresponding saturation temperature Ts, the exhaust temperature overheating degree Tn calculating according to the average exhaust Ta of certain hour inner compressor 110 again, system is controlled at the delivery temperature degree of superheat Tn that opens compressor in a default rational scope, system high energy efficiency and stable operation are guaranteed like this, prevent from opening in system the too low Wet Compression causing of compressor exhaust temperature Tn or excessive discharge temperature and caused the carbonization harm to lubricating oil.
The foregoing is only preferred embodiment of the present invention, not in order to limit the present invention, all any modifications of doing within the spirit and principles in the present invention, be equal to and replace and improvement etc., within all should being included in protection scope of the present invention.
Claims (10)
1. an air conditioner electronic expansion valve control system, it is applied on the off-premises station of multi-connected machine, is electrically connected, in order to control and to regulate the aperture of this electric expansion valve with the electric expansion valve in off-premises station, it is characterized in that, described air conditioner electronic expansion valve control system comprises:
System start unit, for opening electric expansion valve according to environment temperature with initial opening;
Degree of superheat acquiring unit, for the delivery temperature degree of superheat of timing acquisition compressor;
Judge regulon, whether presetting within the scope of reasonable temperature for the delivery temperature degree of superheat that judges described compressor, and regulate described initial opening to preset the amplitude of accommodation in the time that the described delivery temperature degree of superheat is not within the scope of default reasonable temperature, so that the delivery temperature degree of superheat of described compressor is got back within the scope of described default reasonable temperature.
2. air conditioner electronic expansion valve control system as claimed in claim 1, is characterized in that, described degree of superheat acquiring unit comprises:
Saturation temperature acquisition module, for obtaining the pressure at expulsion of Preset Time inner compressor, obtains corresponding saturation temperature according to described pressure at expulsion; And
Degree of superheat computing module, for obtaining the average exhaust of Preset Time inner compressor, and obtains the described delivery temperature degree of superheat by the difference of this average exhaust and saturation temperature.
3. air conditioner electronic expansion valve control system as claimed in claim 1, is characterized in that, described judgement regulon comprises:
First judges adjustment module, for judging whether the delivery temperature degree of superheat of described compressor is greater than default reasonable temperature scope, and be greater than default reasonable temperature in the delivery temperature degree of superheat of this compressor, according to the current delivery temperature degree of superheat accordingly the default amplitude of accommodation increase the initial opening of described electric expansion valve; And
Second judges adjustment module, for judging whether the delivery temperature degree of superheat of described compressor is less than greatly default reasonable temperature scope, and be less than default reasonable temperature in the delivery temperature degree of superheat of this compressor, according to the current delivery temperature degree of superheat accordingly the default amplitude of accommodation reduce the initial opening of described electric expansion valve.
4. air conditioner electronic expansion valve control system as described in claims 1 to 3 any one, is characterized in that, described default reasonable temperature scope is 20 ℃ to 30 ℃, and the described delivery temperature degree of superheat meets following relation with the corresponding default amplitude of accommodation:
If the delivery temperature degree of superheat >=40 ℃, the default amplitude of accommodation is+60 steps;
If 40 ℃ of 30 ℃≤delivery temperature degree of superheat <, the default amplitude of accommodation is+30 steps;
If 20 ℃ of 10 ℃≤delivery temperature degree of superheat <, the default amplitude of accommodation is-30 steps;
If 10 ℃ of delivery temperature degree of superheat <, the default amplitude of accommodation is-60 steps.
5. a control method for electronic expansion valve of air conditioner, is characterized in that, comprises the following steps:
According to environment temperature, electric expansion valve is opened with initial opening;
The delivery temperature degree of superheat of timing acquisition compressor;
Judge that the described delivery temperature degree of superheat, whether presetting within the scope of reasonable temperature, if not, regulates described initial opening that the described delivery temperature degree of superheat is got back within the scope of described default reasonable temperature to preset the amplitude of accommodation.
6. control method for electronic expansion valve of air conditioner as claimed in claim 5, is characterized in that, the step of the delivery temperature degree of superheat of described timing acquisition compressor is specially:
Obtain the pressure at expulsion of Preset Time inner compressor, obtain corresponding saturation temperature according to described pressure at expulsion;
Obtain the average exhaust of Preset Time inner compressor, and obtain the described delivery temperature degree of superheat by the difference of this average exhaust and saturation temperature.
7. control method for electronic expansion valve of air conditioner as claimed in claim 5, it is characterized in that, describedly judge that the described delivery temperature degree of superheat is whether within the scope of default reasonable temperature, if not, be specially to preset the step that the amplitude of accommodation regulates described initial opening that the described delivery temperature degree of superheat is got back within the scope of described default reasonable temperature:
Judge whether the described delivery temperature degree of superheat is greater than default reasonable temperature scope, if the described delivery temperature degree of superheat is greater than default reasonable temperature scope, increase described initial opening according to presetting accordingly the amplitude of accommodation with the current delivery temperature degree of superheat; If the described delivery temperature degree of superheat is less than default reasonable temperature scope, reduce described initial opening according to presetting accordingly the amplitude of accommodation with the current delivery temperature degree of superheat.
8. control method for electronic expansion valve of air conditioner as described in claim 5 to 7 any one, is characterized in that, described default reasonable temperature scope is 20 ℃ to 30 ℃;
The described delivery temperature degree of superheat meets following relation with the corresponding default amplitude of accommodation:
If the delivery temperature degree of superheat >=40 ℃, the default amplitude of accommodation is+60 steps;
If 40 ℃ of 30 ℃≤delivery temperature degree of superheat <, the default amplitude of accommodation is+30 steps;
If 20 ℃ of 10 ℃≤delivery temperature degree of superheat <, the default amplitude of accommodation is-30 steps;
If 10 ℃ of delivery temperature degree of superheat <, the default amplitude of accommodation is-60 steps.
9. a multi-gang air-conditioner off-premises station, the electronic expansion valve controls system that it comprises compressor, electric expansion valve, is electrically connected with this electric expansion valve; It is characterized in that, this electronic expansion valve controls system comprises:
System start unit, for opening electric expansion valve according to environment temperature with initial opening;
Degree of superheat acquiring unit, for the delivery temperature degree of superheat of timing acquisition compressor;
Judge regulon, whether presetting within the scope of reasonable temperature for the delivery temperature degree of superheat that judges described compressor, and regulate described initial opening to preset the amplitude of accommodation in the time that the described delivery temperature degree of superheat is not within the scope of default reasonable temperature, so that the delivery temperature degree of superheat of described compressor is got back within the scope of described default reasonable temperature.
10. multi-gang air-conditioner off-premises station as claimed in claim 9, it is characterized in that, described degree of superheat acquiring unit comprises saturation temperature acquisition module and degree of superheat computing module, this saturation degree acquisition module, for obtaining the pressure at expulsion of Preset Time inner compressor, obtains corresponding saturation temperature according to described pressure at expulsion; Described degree of superheat computing module is used for obtaining the average exhaust of Preset Time inner compressor, and obtains the described delivery temperature degree of superheat by the difference of this average exhaust and saturation temperature;
Described judgement regulon comprises that the first judgement adjustment module and second judges adjustment module, this first judges whether adjustment module is greater than default reasonable temperature scope for the delivery temperature degree of superheat that judges described compressor, and be greater than default reasonable temperature in the delivery temperature degree of superheat of this compressor, according to the current delivery temperature degree of superheat accordingly the default amplitude of accommodation increase the initial opening of described electric expansion valve; Described second judges that adjustment module is for judging whether the delivery temperature degree of superheat of described compressor is less than greatly default reasonable temperature scope, and be less than default reasonable temperature in the delivery temperature degree of superheat of this compressor, according to the current delivery temperature degree of superheat accordingly the default amplitude of accommodation reduce the initial opening of described electric expansion valve.
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| CN201210514698.XA CN103851847A (en) | 2012-12-03 | 2012-12-03 | System and method for controlling electronic expansion valve of air conditioner, and multi-split air conditioner outdoor unit |
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| CN201210514698.XA CN103851847A (en) | 2012-12-03 | 2012-12-03 | System and method for controlling electronic expansion valve of air conditioner, and multi-split air conditioner outdoor unit |
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