CN104676996A - Generation method and generation system for initial opening degree of electronic expansion valve - Google Patents

Abstract

The invention discloses a generation method and a generation system for the initial opening degree of an electronic expansion valve. The method includes the following steps: the rated refrigerating capacity Qc and rated operating frequency fc of an air conditioner, the target frequency f of the started air conditioner, outdoor temperature Tout and indoor temperature Tsin are read, and according to the rated refrigerating capacity Qc and rated operating frequency fc of the air conditioner and the target frequency f of the started air conditioner, the operating-condition refrigerating capacity Q of the air conditioner is generated by calculation; according to the operating-condition refrigerating capacity Q, the outdoor temperature Tout and the indoor temperature Tsin, the value of air conditioner refrigerant mass flow m is generated by calculation; according to the value of air conditioner refrigerant mass flow m and the flow area A of the electronic expansion valve, the lift of the electronic expansion valve is generated by calculation; according to the lift of the electronic expansion valve, the initial opening degree of the electronic expansion valve is generated by calculation. The invention solves the problem that since the initial opening degrees of electronic expansion valves of conventional air conditioners are generated according to the experience of people or experiments, incorrect initial opening degrees can lead to the slow stabilization of systems in operation.

Description

The generation method of electric expansion valve initial opening and device

Technical field

The present invention relates to control field, in particular to a kind of generation method and device of electric expansion valve initial opening.

Background technology

Electric expansion valve initial opening refers to just starts shooting the moment in air-conditioning system, electric expansion valve preset value size.In control method for electronic expansion valve, electric expansion valve initial opening plays vital effect to air-conditioning system is stable, if it is improper that electric expansion valve initial opening is selected, then stable very slow of air-conditioning system, if it is suitable that electric expansion valve initial opening is selected, then system can reach stable very soon, and system can be run under the state that efficiency is higher.

Here it should be noted that, the setting of existing electric expansion valve initial opening does not have theoretical as instructing, and only relies on and tests or experience, and often air-conditioning system initial opening is selected not to be reasonable especially, and after causing air-conditioning system to be run, stabilized speed is slow.

Initial opening for the electric expansion valve of existing air-conditioning generates according to the experience of people or experiment, initial opening is improper cause system cloud gray model after stable slow problem, at present effective solution is not yet proposed.

Summary of the invention

Main purpose of the present invention is the generation method and the device that provide a kind of electric expansion valve initial opening, generate according to the experience of people or experiment to solve the initial opening of the electric expansion valve of existing air-conditioning, initial opening is improper cause system cloud gray model after stable slow problem.

To achieve these goals, according to an aspect of the embodiment of the present invention, a kind of generation method of electric expansion valve initial opening is provided.The method comprises: the specified refrigerating capacity Q reading air-conditioning _c, nominal operating frequency f _c, target frequency f, indoor temperature T after air-conditioning start _sinand the temperature T of outdoor _out; According to the specified refrigerating capacity Q of air-conditioning _c, nominal operating frequency f _cand the target frequency f after air-conditioning start calculates the operating mode refrigerating capacity Q generating air-conditioning; According to operating mode refrigerating capacity Q, indoor temperature T _sinand the temperature T of outdoor _outcalculate the value generating air-conditioning refrigerant mass flow m; The lift generating electric expansion valve is calculated according to the value of air-conditioning refrigerant mass flow m, the circulation area A of electric expansion valve; Lift according to electric expansion valve calculates the initial opening generating electric expansion valve.

Further, according to the specified refrigerating capacity Q of air-conditioning _c, nominal operating frequency f _cand the target frequency f after air-conditioning start calculates the step of operating mode refrigerating capacity Q generating air-conditioning and comprises: according to the operating mode refrigerating capacity Q of following formulae discovery air-conditioning, formula is: wherein, Q _cfor the specified refrigerating capacity of air-conditioning, f _cfor the nominal operating frequency of air-conditioning, f is the target frequency after air-conditioning start.

Further, according to operating mode refrigerating capacity Q, the indoor temperature T of air-conditioning _sinand the temperature T of outdoor _outthe step calculating the value generating air-conditioning refrigerant mass flow m comprises: the value according to the operating mode refrigerating capacity m of following first formulae discovery air-conditioning: wherein, expression temperature is T _sin, cold-producing medium enthalpy during mass dryness fraction x=1, expression temperature is T _out, cold-producing medium enthalpy during mass dryness fraction x=0.

Further, step according to the lift of the value of air-conditioning refrigerant mass flow m, the circulation area A calculating generation electric expansion valve of electric expansion valve comprises: the value obtaining the circulation area A of electric expansion valve according to second formulae discovery of air-conditioning refrigerant mass flow m, wherein, second formula of air-conditioning refrigerant mass flow m is: obtain the lift h (B) of electric expansion valve according to the computing formula of the circulation area A of electric expansion valve, wherein, the computing formula of the circulation area A of electric expansion valve is: wherein, in above-mentioned formula, C _dfor flow of electronic expansion valve coefficient, C _lfor electric expansion valve circulation area coefficient, d, β are respectively electronic expansion valve structure orifice diameter and needle cone angle, and ρ is and outdoor temperature T _outcorresponding cold-producing medium Saturate liquid density, △ P is and outdoor temperature T _outcorresponding cold-producing medium two-phase section pressure and indoor temperature T _sinthe difference of corresponding cold-producing medium two-phase section pressure.

Further, the step calculating the initial opening of generation electric expansion valve according to the lift of electric expansion valve comprises: according to the initial opening B of following formulae discovery electric expansion valve, formula is: wherein, the lift that h (B) is electric expansion valve, B ₀for the electronic expansion valve opening when electronic expansion lift of a valve is 0, δ is the electric expansion valve step number that electric expansion valve flight pitch is corresponding, and α is the height of an electric expansion valve flight pitch.

To achieve these goals, according to the another aspect of the embodiment of the present invention, provide a kind of generating apparatus of electric expansion valve initial opening, this device comprises: reading unit, for reading the specified refrigerating capacity Q of air-conditioning _c, nominal operating frequency f _c, target frequency f, indoor temperature T after air-conditioning start _sinand the temperature T of outdoor _out; First computing unit, for the specified refrigerating capacity Q according to air-conditioning _c, nominal operating frequency f _cand the target frequency f after air-conditioning start calculates the operating mode refrigerating capacity Q generating air-conditioning; Second computing unit, for the temperature T according to operating mode refrigerating capacity Q, indoor _sinand the temperature T of outdoor _outcalculate the value generating air-conditioning refrigerant mass flow m; 3rd computing unit, the circulation area A for the value according to air-conditioning refrigerant mass flow m, electric expansion valve calculates the lift generating electric expansion valve; 4th computing unit, calculates for the lift according to electric expansion valve the initial opening generating electric expansion valve.

Further, the first computing unit comprises: the first computing module, and for the operating mode refrigerating capacity Q according to following formulae discovery air-conditioning, formula is: wherein, Q _cfor the specified refrigerating capacity of air-conditioning, f _cfor the nominal operating frequency of air-conditioning, f is the target frequency after air-conditioning start.

Further, the second computing unit comprises: the second computing module, the value for the operating mode refrigerating capacity m according to following first formulae discovery air-conditioning: wherein, expression temperature is T _sin, cold-producing medium enthalpy during mass dryness fraction x=1, expression temperature is T _out, cold-producing medium enthalpy during mass dryness fraction x=0.

Further, the 3rd computing unit comprises: the 3rd computing module, and for obtaining the value of the circulation area A of electric expansion valve according to second formulae discovery of air-conditioning refrigerant mass flow m, wherein, second formula of air-conditioning refrigerant mass flow m is: 4th computing module, the computing formula for the circulation area A according to electric expansion valve obtains the lift h (B) of electric expansion valve, and wherein, the computing formula of the circulation area A of electric expansion valve is: wherein, in above-mentioned formula, C _dfor flow of electronic expansion valve coefficient, C _lfor electric expansion valve circulation area coefficient, d, β are respectively electronic expansion valve structure orifice diameter and needle cone angle, and ρ is and outdoor temperature T _outcorresponding cold-producing medium Saturate liquid density, △ P is and outdoor temperature T _outcorresponding cold-producing medium two-phase section pressure and indoor temperature T _sinthe difference of corresponding cold-producing medium two-phase section pressure.

Further, the 4th computing unit comprises: the 5th computing module, and for the initial opening B according to following formulae discovery electric expansion valve, formula is: wherein, the lift that h (B) is electric expansion valve, B ₀for the electronic expansion valve opening when electronic expansion lift of a valve is 0, δ is the electric expansion valve step number that electric expansion valve flight pitch is corresponding, and α is the height of an electric expansion valve flight pitch.

According to the embodiment of the present invention, by reading the specified refrigerating capacity Q of air-conditioning _c, nominal operating frequency f _c, target frequency f, indoor temperature T after air-conditioning start _sinand the temperature T of outdoor _out, according to the specified refrigerating capacity Q of air-conditioning _c, nominal operating frequency f _cand the target frequency f after air-conditioning start calculates the operating mode refrigerating capacity Q generating air-conditioning; According to operating mode refrigerating capacity Q, indoor temperature T _sinand the temperature T of outdoor _outcalculate the value generating air-conditioning refrigerant mass flow m; The lift generating electric expansion valve is calculated according to the value of air-conditioning refrigerant mass flow m, the circulation area A of electric expansion valve; Calculate the initial opening generating electric expansion valve according to the lift of electric expansion valve, the initial opening solving the electric expansion valve of existing air-conditioning generates according to the experience of people or experiment, initial opening is improper cause system cloud gray model after stable slow problem

Accompanying drawing explanation

The accompanying drawing forming a application's part is used to provide a further understanding of the present invention, and schematic description and description of the present invention, for explaining the present invention, does not form inappropriate limitation of the present invention.In the accompanying drawings:

Fig. 1 is the flow chart of the generation method of electric expansion valve initial opening according to the embodiment of the present invention; And

Fig. 2 is the schematic diagram of the generating apparatus of electric expansion valve initial opening according to the embodiment of the present invention.

Detailed description of the invention

It should be noted that, when not conflicting, the embodiment in the application and the feature in embodiment can combine mutually.Below with reference to the accompanying drawings and describe the present invention in detail in conjunction with the embodiments.

The present invention program is understood better in order to make those skilled in the art person, below in conjunction with the accompanying drawing in the embodiment of the present invention, technical scheme in the embodiment of the present invention is clearly and completely described, obviously, described embodiment is only the embodiment of a part of the present invention, instead of whole embodiments.Based on the embodiment in the present invention, those of ordinary skill in the art, not making the every other embodiment obtained under creative work prerequisite, should belong to the scope of protection of the invention.

It should be noted that, term " first ", " second " etc. in description of the present invention and claims and above-mentioned accompanying drawing are for distinguishing similar object, and need not be used for describing specific order or precedence.Should be appreciated that the data used like this can be exchanged, in the appropriate case so that embodiments of the invention described herein.In addition, term " comprises " and " having " and their any distortion, intention is to cover not exclusive comprising, such as, contain those steps or unit that the process of series of steps or unit, method, system, product or equipment is not necessarily limited to clearly list, but can comprise clearly do not list or for intrinsic other step of these processes, method, product or equipment or unit.

Embodiment one

Embodiments provide a kind of generation method of electric expansion valve initial opening.As shown in Figure 1, it is as follows that the method comprising the steps of:

Step S10, reads the specified refrigerating capacity Q of air-conditioning _c, nominal operating frequency f _c, target frequency f, indoor temperature T after air-conditioning start _sinand the temperature T of outdoor _out.

Concrete, when air-conditioning system is just started shooting, air-conditioning system can generate a target frequency according to user for the target temperature that air-conditioning sets, and then reads above-mentioned target frequency f in this programme, and the specified refrigerating capacity Q of the air-conditioning of air-conditioning self _cwith nominal operating frequency f _c.

Here it should be noted that, the specified refrigerating capacity Q of above-mentioned air-conditioning _cwith nominal operating frequency f _ccan for air-conditioning dispatch from the factory after the refrigeration standard that carries, it may be used for the performance characterizing air conditioner refrigerating.

Step S12, according to the specified refrigerating capacity Q of air-conditioning _c, nominal operating frequency f _cand the target frequency f after air-conditioning start calculates the operating mode refrigerating capacity Q generating air-conditioning.

Concrete, in this programme, can according to the specified refrigerating capacity Q of the air-conditioning obtained in step S10 _c, nominal operating frequency f _cand the target frequency f after air-conditioning start estimates the operating mode refrigerating capacity Q generating air-conditioning.

Step S14, according to operating mode refrigerating capacity Q, indoor temperature T _sinand the temperature T of outdoor _outcalculate the value generating air-conditioning refrigerant mass flow m.

Concrete, in this programme, can according to the temperature T outside the operating mode refrigerating capacity Q of the air-conditioning estimated in above-mentioned steps S12 and the air conditioning chamber detected in real time _outwith the temperature T of indoor, air-conditioning place _sinestimate the flow of air-conditioning system refrigerant quality.

Step S16, calculates according to the value of air-conditioning refrigerant mass flow m, the circulation area A of electric expansion valve the lift generating electric expansion valve.

Step S18, the lift according to electric expansion valve calculates the initial opening generating electric expansion valve.

Concrete, in this programme, after calculating the lift generating above-mentioned electric expansion valve, because the lift of electric expansion valve and the aperture of electric expansion valve are corresponding linear relationships, therefore, the initial opening of electric expansion valve can be calculated by the lift of electric expansion valve by this linear relationship.

Optionally, in a kind of optional embodiment, after the initial opening generating electric expansion valve, above-mentioned initial opening can be sent to above-mentioned electric expansion valve, carry out work by electric expansion valve according to above-mentioned initial opening.

The present embodiment is by obtaining the specified refrigerating capacity Q of air-conditioning in the air-conditioning start moment _c, nominal operating frequency f _c, target frequency f, indoor temperature T after air-conditioning start _sinand the temperature T of outdoor _outcalculate the lift of electric expansion valve, the initial opening of above-mentioned air-conditioning system is obtained again by the corresponding relation between the lift of electric expansion valve and electric expansion valve, the initial opening that the invention solves the electric expansion valve of existing air-conditioning generates according to the experience of people or experiment, initial opening is improper cause system cloud gray model after stable slow, achieve the effect accelerating air-conditioning system stabilized speed.

Optionally, step S12, according to the specified refrigerating capacity Q of air-conditioning _c, nominal operating frequency f _cand the target frequency f after air-conditioning start calculates the step of operating mode refrigerating capacity Q generating air-conditioning and comprises:

Step S121, the operating mode refrigerating capacity Q according to following formulae discovery air-conditioning:

wherein, Q _cfor the specified refrigerating capacity of air-conditioning, f _cfor the nominal operating frequency of air-conditioning, f is the target frequency after air-conditioning start.

Optionally, step S14, according to operating mode refrigerating capacity Q, indoor temperature T _sinand the temperature T of outdoor _outthe step calculating the value generating air-conditioning refrigerant mass flow m comprises:

Step S141, the value according to the operating mode refrigerating capacity m of following first formulae discovery air-conditioning:

wherein, expression temperature is T _sin, cold-producing medium enthalpy during mass dryness fraction x=1, expression temperature is T _out, cold-producing medium enthalpy during mass dryness fraction x=0.

Here it should be noted that, above-mentioned two enthalpies can be crossed the physical properties parametric software such as EES (engineering equations countermeasurer) and find, then are fitted in correlation formula input control parameter by data fitting software ORIGIN etc.

Optionally, step S16, the step according to the lift of the value of air-conditioning refrigerant mass flow m, the circulation area A calculating generation electric expansion valve of electric expansion valve can comprise:

Step S161, obtains the value of the circulation area A of electric expansion valve according to second formulae discovery of air-conditioning refrigerant mass flow m, wherein, second formula of air-conditioning refrigerant mass flow m is:

Step S162, obtains the lift h (B) of electric expansion valve according to the computing formula of the circulation area A of electric expansion valve, wherein, the computing formula of the circulation area A of electric expansion valve is: wherein, in above-mentioned formula, C _dfor flow of electronic expansion valve coefficient, C _lfor electric expansion valve circulation area coefficient, d, β are respectively electronic expansion valve structure orifice diameter and needle cone angle, and ρ is and outdoor temperature T _outcorresponding cold-producing medium Saturate liquid density, △ P is and outdoor temperature T _outcorresponding cold-producing medium two-phase section pressure and indoor temperature T _sinthe difference of corresponding cold-producing medium two-phase section pressure.

Here it should be noted that, outdoor temperature T _outcorresponding cold-producing medium two-phase section pressure with indoor temperature T _sincorresponding cold-producing medium two-phase section pressure can be found by physical properties parametric software such as EES (engineering equations countermeasurer), then be fitted in correlation formula input control parameter by data fitting software ORIGIN etc.

Optionally, step S18, the step calculating the initial opening generating electric expansion valve according to the lift of electric expansion valve comprises:

Step S181, the initial opening B according to following formulae discovery electric expansion valve:

wherein, the lift that h (B) is electric expansion valve, B ₀for the electronic expansion valve opening when electronic expansion lift of a valve is 0, δ is the electric expansion valve step number that electric expansion valve flight pitch is corresponding, and α is the height of an electric expansion valve flight pitch.

The present invention, by each step above-mentioned, proposes the computational methods of a kind of air-conditioning system at start moment electric expansion valve initial opening, makes Air-condition system control more reasonable, runs more stable, energy saving in running more.

Below in conjunction with embody rule scene, this programme is described:

The present invention can provide a kind of electric expansion valve initial opening computational methods, and circular is divided into following two steps:

(1) cooling system amount estimation

Convertible frequency air-conditioner has frequency targets value f, according to the specified refrigerating capacity Q of air-conditioning in system moment of just having started shooting _cand nominal operating frequency f _cestimation operating mode refrigerating capacity Q, specific formula for calculation is as follows:

$Q=Q_c\×\frac{f}{f_c}---\left(1\right)$

According to current operation of air conditioner outdoor temperature T _outwith indoor design temperature T _sinestimation air-conditioning system refrigerant mass fluxes:

$m=\frac{Q}{h_{(T_{\sin },x=1)}-h_{(T_{\mathrm{out}},x=0)}}---\left(2\right)$

In formula (2), expression temperature is T _sin, cold-producing medium enthalpy during mass dryness fraction x=1, expression temperature is T _out, cold-producing medium enthalpy during mass dryness fraction x=0, above parameter is found by physical properties parametric software such as EES (engineering equations countermeasurer), then is fitted in correlation formula input control parameter by data fitting software ORIGIN etc.

(2) electric expansion valve initial opening estimation

Electric expansion valve circulation area calculation expression is in formula, A is area, C _lfor constant, d, β are electric expansion valve dimensional parameters, and h (B) is the electronic expansion lift of a valve, becomes one-to-one relationship with electronic expansion valve opening.

Anti-electronic expansion valve opening can be released by refrigerant flow and flow of electronic expansion valve computing formula:

$m=C_{D}A\sqrt{2\mathrm{\ρ\ΔP}}---\left(3\right)$

$h\left(B\right)=\frac{m}{C_D{C}_L\mathrm{\π}d\sin \frac{\mathrm{\β}}{2}\sqrt{2{\mathrm{\ρ}}_{\left(T_{\mathrm{out}}\right)}(P_{\left(T_{\mathrm{out}}\right)}-P_{\left(T_{\sin }\right)})}}---\left(4\right)$

In formula (3) and formula (4) formula, C _dfor flow of electronic expansion valve coefficient, C _lfor electric expansion valve circulation area coefficient, C _d, C _lbe constant, its numerical values recited is only relevant with electric expansion valve model, finds by pertinent literature.D, β are respectively electronic expansion valve structure orifice diameter and needle cone angle, can determine according to different size electronic expansion valve structure parameter. for with outdoor temperature T _outcorresponding cold-producing medium Saturate liquid density, for with outdoor temperature T _outcorresponding cold-producing medium two-phase section pressure, for with indoor temperature T _sincorresponding cold-producing medium two-phase section pressure, above parameter is found by physical properties parametric software such as EES (engineering equations countermeasurer), then is fitted in correlation formula input control parameter by data fitting software ORIGIN etc.H (B) is the electronic expansion lift of a valve, is linear corresponding relation with electronic expansion valve opening, and electric expansion valve specification is once determine, linear corresponding relation also can be determined, circular is as follows:

$h\left(B\right)=\frac{B-B_0}{\mathrm{\δ}}\×\mathrm{\α}---\left(5\right)$

In formula (5), B is electronic expansion valve opening, B ₀for the electronic expansion valve opening when electronic expansion lift of a valve is 0, δ is the electric expansion valve step number that electric expansion valve flight pitch is corresponding, and α is the height of an electric expansion valve flight pitch.

Here it should be noted that, above parameter can be carried out fitting of a polynomial according to existing physical properties parameter and be write in control program, does not have unknown parameter.The aperture of electric expansion valve in the system boot moment can be calculated thus.

Embodiment two

The embodiment of the present invention additionally provides a kind of generating apparatus of electric expansion valve initial opening, and as shown in Figure 2, this device can comprise:

Reading unit 20, for reading the specified refrigerating capacity Q of air-conditioning _c, nominal operating frequency f _c, target frequency f, indoor temperature T after air-conditioning start _sinand the temperature T of outdoor _out.

Concrete, when air-conditioning system is just started shooting, air-conditioning system can generate a target frequency according to user for the target temperature that air-conditioning sets, and then reads above-mentioned target frequency f in this programme, and the specified refrigerating capacity Q of the air-conditioning of air-conditioning self _cwith nominal operating frequency f _c.

Here it should be noted that, the specified refrigerating capacity Q of above-mentioned air-conditioning _cwith nominal operating frequency f _ccan for air-conditioning dispatch from the factory after the refrigeration standard that carries, it may be used for the performance characterizing air conditioner refrigerating.

First computing unit 22, for the specified refrigerating capacity Q according to air-conditioning _c, nominal operating frequency f _cand the target frequency f after air-conditioning start calculates the operating mode refrigerating capacity Q generating air-conditioning.

Concrete, in this programme, can according to the specified refrigerating capacity Q of the air-conditioning got _c, nominal operating frequency f _cand the target frequency f after air-conditioning start estimates the operating mode refrigerating capacity Q generating air-conditioning.

Second computing unit 24, for the temperature T according to operating mode refrigerating capacity Q, indoor _sinand the temperature T of outdoor _outcalculate the value generating air-conditioning refrigerant mass flow m.

Concrete, in this programme, can according to the temperature T outside the operating mode refrigerating capacity Q of the air-conditioning estimated in above-mentioned steps S12 and the air conditioning chamber detected in real time _outwith the temperature T of indoor, air-conditioning place _sinestimate the flow of air-conditioning system refrigerant quality.

3rd computing unit 26, the circulation area A for the value according to air-conditioning refrigerant mass flow m, electric expansion valve calculates the lift generating electric expansion valve.

4th computing unit 28, calculates for the lift according to electric expansion valve the initial opening generating electric expansion valve.

Concrete, in this programme, after calculating the lift generating above-mentioned electric expansion valve, because the lift of electric expansion valve and the aperture of electric expansion valve are corresponding linear relationships, therefore, the initial opening of electric expansion valve can be calculated by the lift of electric expansion valve by this linear relationship.

Optionally, in a kind of optional embodiment, after the initial opening generating electric expansion valve, above-mentioned initial opening can be sent to above-mentioned electric expansion valve, carry out work by electric expansion valve according to above-mentioned initial opening.

The present embodiment is by obtaining the specified refrigerating capacity Q of air-conditioning in the air-conditioning start moment _c, nominal operating frequency f _c, target frequency f, indoor temperature T after air-conditioning start _sinand the temperature T of outdoor _outcalculate the lift of electric expansion valve, the initial opening of above-mentioned air-conditioning system is obtained again by the corresponding relation between the lift of electric expansion valve and electric expansion valve, the initial opening that the invention solves the electric expansion valve of existing air-conditioning generates according to the experience of people or experiment, initial opening is improper cause system cloud gray model after stable slow, achieve the effect accelerating air-conditioning system stabilized speed.

Optionally, above-mentioned first computing unit 22 can comprise:

First computing module, the operating mode refrigerating capacity Q for according to following formulae discovery air-conditioning:

wherein, Q _cfor the specified refrigerating capacity of air-conditioning, f _cfor the nominal operating frequency of air-conditioning, f is the target frequency after air-conditioning start.

Optionally, above-mentioned second computing unit 24 can comprise:

Second computing module, the value for the operating mode refrigerating capacity m according to following first formulae discovery air-conditioning:

wherein, expression temperature is T _sin, cold-producing medium enthalpy during mass dryness fraction x=1, expression temperature is T _out, cold-producing medium enthalpy during mass dryness fraction x=0.

Here it should be noted that, above-mentioned two enthalpies can be crossed the physical properties parametric software such as EES (engineering equations countermeasurer) and find, then are fitted in correlation formula input control parameter by data fitting software ORIGIN etc.

Optionally, above-mentioned 3rd computing unit 26 can comprise:

3rd computing module, for obtaining the value of the circulation area A of electric expansion valve according to second formulae discovery of air-conditioning refrigerant mass flow m, wherein, second formula of air-conditioning refrigerant mass flow m is:

4th computing module, the computing formula for the circulation area A according to electric expansion valve obtains the lift h (B) of electric expansion valve, and wherein, the computing formula of the circulation area A of electric expansion valve is: wherein, in above-mentioned formula, C _dfor flow of electronic expansion valve coefficient, C _lfor electric expansion valve circulation area coefficient, d, β are respectively electronic expansion valve structure orifice diameter and needle cone angle, and ρ is and outdoor temperature T _outcorresponding cold-producing medium Saturate liquid density, △ P is and outdoor temperature T _outcorresponding cold-producing medium two-phase section pressure and indoor temperature T _sinthe difference of corresponding cold-producing medium two-phase section pressure.

Here it should be noted that, outdoor temperature T _outcorresponding cold-producing medium two-phase section pressure with indoor temperature T _sincorresponding cold-producing medium two-phase section pressure can be found by physical properties parametric software such as EES (engineering equations countermeasurer), then be fitted in correlation formula input control parameter by data fitting software ORIGIN etc.

Optionally, above-mentioned 4th computing unit 28 can comprise:

5th computing module, the initial opening B for according to following formulae discovery electric expansion valve:

wherein, the lift that h (B) is electric expansion valve, B ₀for the electronic expansion valve opening when electronic expansion lift of a valve is 0, δ is the electric expansion valve step number that electric expansion valve flight pitch is corresponding, and α is the height of an electric expansion valve flight pitch.

The present invention, by performing above-mentioned unit and module, provides the computational methods of a kind of air-conditioning system at start moment electric expansion valve initial opening, makes Air-condition system control more reasonable, runs more stable, energy saving in running more.

Below in conjunction with embody rule scene, this programme is described:

The present invention can provide a kind of electric expansion valve initial opening computational methods, and circular is divided into following two steps:

(1) cooling system amount estimation

Convertible frequency air-conditioner has frequency targets value f, according to the specified refrigerating capacity Q of air-conditioning in system moment of just having started shooting _cand nominal operating frequency f _cestimation operating mode refrigerating capacity Q, specific formula for calculation is as follows:

$Q=Q_c\×\frac{f}{f_c}---\left(6\right)$

According to current operation of air conditioner outdoor temperature T _outwith indoor design temperature T _sinestimation air-conditioning system refrigerant mass fluxes:

$m=\frac{Q}{h_{(T_{\sin },x=1)}-h_{(T_{\mathrm{out}},x=0)}}---\left(7\right)$

In formula (2), expression temperature is T _sin, cold-producing medium enthalpy during mass dryness fraction x=1, expression temperature is T _out, cold-producing medium enthalpy during mass dryness fraction x=0, above parameter is found by physical properties parametric software such as EES (engineering equations countermeasurer), then is fitted in correlation formula input control parameter by data fitting software ORIGIN etc.

(2) electric expansion valve initial opening estimation

Electric expansion valve circulation area calculation expression is in formula, A is area, C _lfor constant, d, β are electric expansion valve dimensional parameters, and h (B) is the electronic expansion lift of a valve, becomes one-to-one relationship with electronic expansion valve opening.

Anti-electronic expansion valve opening can be released by refrigerant flow and flow of electronic expansion valve computing formula:

$m=C_{D}A\sqrt{2\mathrm{\ρ\ΔP}}---\left(8\right)$

$h\left(B\right)=\frac{m}{C_D{C}_L\mathrm{\π}d\sin \frac{\mathrm{\β}}{2}\sqrt{2{\mathrm{\ρ}}_{\left(T_{\mathrm{out}}\right)}(P_{\left(T_{\mathrm{out}}\right)}-P_{\left(T_{\sin }\right)})}}---\left(9\right)$

In formula (3) and formula (4) formula, C _dfor flow of electronic expansion valve coefficient, C _lfor electric expansion valve circulation area coefficient, C _d, C _lbe constant, its numerical values recited is only relevant with electric expansion valve model, finds by pertinent literature.D, β are respectively electronic expansion valve structure orifice diameter and needle cone angle, can determine according to different size electronic expansion valve structure parameter. for with outdoor temperature T _outcorresponding cold-producing medium Saturate liquid density, for with outdoor temperature corresponding cold-producing medium two-phase section pressure, for with indoor temperature T _sincorresponding cold-producing medium two-phase section pressure, above parameter is found by physical properties parametric software such as EES (engineering equations countermeasurer), then is fitted in correlation formula input control parameter by data fitting software ORIGIN etc.H (B) is the electronic expansion lift of a valve, is linear corresponding relation with electronic expansion valve opening, and electric expansion valve specification is once determine, linear corresponding relation also can be determined, circular is as follows:

$h\left(B\right)=\frac{B-B_0}{\mathrm{\δ}}\×\mathrm{\α}---\left(10\right)$

In formula (5), B is electronic expansion valve opening, B ₀for the electronic expansion valve opening when electronic expansion lift of a valve is 0, δ is the electric expansion valve step number that electric expansion valve flight pitch is corresponding, and α is the height of an electric expansion valve flight pitch.

Here it should be noted that, above parameter can be carried out fitting of a polynomial according to existing physical properties parameter and be write in control program, does not have unknown parameter.The aperture of electric expansion valve in the system boot moment can be calculated thus.

It should be noted that, for aforesaid each embodiment of the method, in order to simple description, therefore it is all expressed as a series of combination of actions, but those skilled in the art should know, the present invention is not by the restriction of described sequence of movement, because according to the present invention, some step can adopt other orders or carry out simultaneously.Secondly, those skilled in the art also should know, the embodiment described in description all belongs to preferred embodiment, and involved action and module might not be that the present invention is necessary.

In the above-described embodiments, the description of each embodiment is all emphasized particularly on different fields, in certain embodiment, there is no the part described in detail, can see the associated description of other embodiments.

In several embodiments that the application provides, should be understood that, disclosed device, the mode by other realizes.Such as, device embodiment described above is only schematic, the such as division of described unit, be only a kind of logic function to divide, actual can have other dividing mode when realizing, such as multiple unit or assembly can in conjunction with or another system can be integrated into, or some features can be ignored, or do not perform.Another point, shown or discussed coupling each other or direct-coupling or communication connection can be by some interfaces, and the INDIRECT COUPLING of device or unit or communication connection can be electrical or other form.

The described unit illustrated as separating component or can may not be and physically separates, and the parts as unit display can be or may not be physical location, namely can be positioned at a place, or also can be distributed on multiple NE.Some or all of unit wherein can be selected according to the actual needs to realize the object of the present embodiment scheme.

In addition, each functional unit in each embodiment of the present invention can be integrated in a processing unit, also can be that the independent physics of unit exists, also can two or more unit in a unit integrated.Above-mentioned integrated unit both can adopt the form of hardware to realize, and the form of SFU software functional unit also can be adopted to realize.

If described integrated unit using the form of SFU software functional unit realize and as independently production marketing or use time, can be stored in a computer read/write memory medium.Based on such understanding, the part that technical scheme of the present invention contributes to prior art in essence in other words or all or part of of this technical scheme can embody with the form of software product, this computer software product is stored in a storage medium, comprises all or part of step of some instructions in order to make a computer equipment (can be personal computer, mobile terminal, server or the network equipment etc.) perform method described in each embodiment of the present invention.And aforesaid storage medium comprises: USB flash disk, read-only storage (ROM, Read-Only Memory), random access memory (RAM, Random Access Memory), portable hard drive, magnetic disc or CD etc. various can be program code stored medium.

The foregoing is only the preferred embodiments of the present invention, be not limited to the present invention, for a person skilled in the art, the present invention can have various modifications and variations.Within the spirit and principles in the present invention all, any amendment done, equivalent replacement, improvement etc., all should be included within protection scope of the present invention.

Claims (10)

1. a generation method for electric expansion valve initial opening, is characterized in that, comprising:

Read the specified refrigerating capacity Q of air-conditioning _c, nominal operating frequency f _c, target frequency f, indoor temperature T after air-conditioning start _sinand the temperature T of outdoor _out;

According to the specified refrigerating capacity Q of described air-conditioning _c, nominal operating frequency f _cand the target frequency f after air-conditioning start calculates the operating mode refrigerating capacity Q generating air-conditioning;

According to the temperature T of described operating mode refrigerating capacity Q, described indoor _sinand the temperature T of described outdoor _outcalculate the value generating air-conditioning refrigerant mass flow m;

The lift generating described electric expansion valve is calculated according to the value of described air-conditioning refrigerant mass flow m, the circulation area A of electric expansion valve;

Lift according to described electric expansion valve calculates the initial opening generating described electric expansion valve.

2. method according to claim 1, is characterized in that, according to the specified refrigerating capacity Q of described air-conditioning _c, nominal operating frequency f _cand the target frequency f after air-conditioning start calculates the step of operating mode refrigerating capacity Q generating air-conditioning and comprises:

The operating mode refrigerating capacity Q of air-conditioning according to following formulae discovery:

wherein, Q _cfor the specified refrigerating capacity of described air-conditioning, f _cfor the nominal operating frequency of described air-conditioning, f is the target frequency after the start of described air-conditioning.

3. method according to claim 1, is characterized in that, according to described operating mode refrigerating capacity Q, indoor temperature T _sinand the temperature T of outdoor _outthe step calculating the value generating air-conditioning refrigerant mass flow m comprises:

The value of the operating mode refrigerating capacity m of air-conditioning according to following first formulae discovery:

wherein, expression temperature is T _sin, cold-producing medium enthalpy during mass dryness fraction x=1, expression temperature is T _out, cold-producing medium enthalpy during mass dryness fraction x=0.

4. method according to claim 1, is characterized in that, the step according to the lift of the value of described air-conditioning refrigerant mass flow m, the circulation area A calculating generation electric expansion valve of electric expansion valve comprises:

Obtain the value of the circulation area A of described electric expansion valve according to second formulae discovery of described air-conditioning refrigerant mass flow m, wherein, second formula of described air-conditioning refrigerant mass flow m is:

Obtain the lift h (B) of described electric expansion valve according to the computing formula of the circulation area A of described electric expansion valve, wherein, the computing formula of the circulation area A of described electric expansion valve is: wherein, C _dfor described flow of electronic expansion valve coefficient, C _lfor described electric expansion valve circulation area coefficient, d, β are respectively described electronic expansion valve structure orifice diameter and needle cone angle, and ρ is and described outdoor temperature T _outcorresponding cold-producing medium Saturate liquid density, Δ P is and described outdoor temperature T _outcorresponding cold-producing medium two-phase section pressure and indoor temperature T _sinthe difference of corresponding cold-producing medium two-phase section pressure.

5. method according to claim 1, its feature is being, the step that the described lift according to described electric expansion valve calculates the initial opening generating electric expansion valve comprises:

The initial opening B of electric expansion valve according to following formulae discovery:

wherein, the lift that h (B) is described electric expansion valve, B ₀electronic expansion valve opening when lift for described electric expansion valve is 0, δ is the electric expansion valve step number that described electric expansion valve flight pitch is corresponding, and α is the height of a described electric expansion valve flight pitch.

6. a generating apparatus for electric expansion valve initial opening, is characterized in that, comprising:

Reading unit, for reading the specified refrigerating capacity Q of air-conditioning _c, nominal operating frequency f _c, target frequency f, indoor temperature T after air-conditioning start _sinand the temperature T of outdoor _out;

First computing unit, for the specified refrigerating capacity Q according to described air-conditioning _c, nominal operating frequency f _cand the target frequency f after air-conditioning start calculates the operating mode refrigerating capacity Q generating air-conditioning;

Second computing unit, for the temperature T according to described operating mode refrigerating capacity Q, described indoor _sinand the temperature T of described outdoor _outcalculate the value generating air-conditioning refrigerant mass flow m;

3rd computing unit, the circulation area A for the value according to described air-conditioning refrigerant mass flow m, electric expansion valve calculates the lift generating described electric expansion valve;

4th computing unit, calculates for the lift according to described electric expansion valve the initial opening generating described electric expansion valve.

7. device according to claim 6, is characterized in that, described first computing unit comprises:

First computing module, the operating mode refrigerating capacity Q for air-conditioning according to following formulae discovery:

wherein, Q _cfor the specified refrigerating capacity of described air-conditioning, f _cfor the nominal operating frequency of described air-conditioning, f is the target frequency after the start of described air-conditioning.

8. device according to claim 6, is characterized in that, described second computing unit comprises:

Second computing module, the value for the operating mode refrigerating capacity m of air-conditioning according to following first formulae discovery:

wherein, expression temperature is T _sin, cold-producing medium enthalpy during mass dryness fraction x=1, expression temperature is T _out, cold-producing medium enthalpy during mass dryness fraction x=0.

9. device according to claim 6, is characterized in that, described 3rd computing unit comprises:

3rd computing module, for obtaining the value of the circulation area A of described electric expansion valve according to second formulae discovery of described air-conditioning refrigerant mass flow m, wherein, second formula of described air-conditioning refrigerant mass flow m is: $m=C_{D}A\sqrt{2\mathrm{\ρ\ΔP}};$

4th computing module, the computing formula for the circulation area A according to described electric expansion valve obtains the lift h (B) of described electric expansion valve, and wherein, the computing formula of the circulation area A of described electric expansion valve is: wherein, in above-mentioned formula, C _dfor described flow of electronic expansion valve coefficient, C _lfor described electric expansion valve circulation area coefficient, d, β are respectively described electronic expansion valve structure orifice diameter and needle cone angle, and ρ is and described outdoor temperature T _outcorresponding cold-producing medium Saturate liquid density, Δ P is and described outdoor temperature T _outcorresponding cold-producing medium two-phase section pressure and indoor temperature T _sinthe difference of corresponding cold-producing medium two-phase section pressure.

10. device according to claim 6, its feature is being, described 4th computing unit comprises:

5th computing module, the initial opening B for electric expansion valve according to following formulae discovery:

wherein, the lift that h (B) is described electric expansion valve, B ₀electronic expansion valve opening when lift for described electric expansion valve is 0, δ is the electric expansion valve step number that described electric expansion valve flight pitch is corresponding, and α is the height of a described electric expansion valve flight pitch.