CN105180540A - Exhaust gas temperature control method and system of compressor of low-temperature enthalpy spraying intense heating unit - Google Patents
Exhaust gas temperature control method and system of compressor of low-temperature enthalpy spraying intense heating unit Download PDFInfo
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Abstract
The invention discloses an exhaust gas temperature control method and system of a compressor of a low-temperature enthalpy spraying intense heating unit. According to the method and system, firstly, the enthalpy spraying coolant superheat degree of the unit is acquired; secondly, the enthalpy spraying coolant superheat degree is compared with a preset superheat degree threshold range; if the enthalpy spraying coolant superheat degree is higher than the upper-limit value of the preset superheat degree threshold range, a first preset opening degree stride is added to the opening degree of a enthalpy spraying electronic expansion valve; if the enthalpy spraying coolant superheat degree is lower than the lower-limit value of the preset superheat degree threshold range, the opening degree of the enthalpy spraying electronic expansion valve is decreased by a second preset opening degree stride; by means of the method, the enthalpy spraying coolant superheat degree can be effectively controlled within the preset superheat degree threshold range. Since the enthalpy spraying coolant superheat degree is directly related to the exhaust gas temperature of the compressor, the stability of the exhaust gas temperature of the compressor of the low-temperature enthalpy spraying intense heating unit can be effectively controlled through the method and system; consequently, potential safety hazards caused when the exhaust gas temperature of the compressor exceeds a safety fluctuation range can be effectively avoided by means of the method and system.
Description
Technical field
The application relates to refrigeration technology field, more particularly, relates to a kind of compressor exhaust temperature control method and system of low-temp. spraying enthalpy heat-flash unit.
Background technology
Low-temp. spraying enthalpy heat-flash unit is generally adopt the method for spraying refrigerant in the scroll compression pocket of compressor to improve the heating capacity of unit under ultralow environment temperature; but it is larger to take the unit of this method often to there will be compressor exhaust temperature fluctuation; sometimes even can exceed safe fluctuation range, thus bring hidden danger to the safe operation of unit.
Summary of the invention
In view of this, the application provides a kind of compressor exhaust temperature control method and system of low-temp. spraying enthalpy heat-flash unit, being in stability range, exceeding safe fluctuation range to avoid the fluctuation of compressor exhaust temperature for controlling compressor exhaust temperature.
To achieve these goals, the existing scheme proposed is as follows:
A compressor exhaust temperature control method for low-temp. spraying enthalpy heat-flash unit, is applied to the controller of described low-temp. spraying enthalpy heat-flash unit, comprises step:
Obtain the spray enthalpy refrigerant degree of superheat of described low-temp. spraying enthalpy heat-flash unit;
Judge whether the described spray enthalpy refrigerant degree of superheat is in default degree of superheat threshold range;
As described in the spray enthalpy refrigerant degree of superheat exceed as described in preset degree of superheat threshold range, then judge the described spray enthalpy refrigerant degree of superheat and the relation described in described default degree of superheat threshold range further;
As described in the spray enthalpy refrigerant degree of superheat be greater than as described in preset the higher limit of degree of superheat threshold range, then in the first preset duration, the aperture of spray enthalpy electric expansion valve is increased and presets the first aperture stride;
As described in the spray enthalpy refrigerant degree of superheat be less than as described in preset the lower limit of degree of superheat threshold range, then the aperture of described spray enthalpy electric expansion valve is reduced to preset the second aperture stride in the second preset duration.
Optionally, the spray enthalpy refrigerant degree of superheat of described acquisition described low-temp. spraying enthalpy heat-flash unit, comprising:
Obtain hydrojet pressure and the actual temperature of the refrigerant mouth spray of scroll compression pocket;
Theoretical temperatures corresponding to described hydrojet pressure is calculated according to thermodynamics theorem;
Described actual temperature is deducted described theoretical temperatures, obtains the described spray enthalpy refrigerant degree of superheat.
Optionally, also step is comprised:
As described in the spray enthalpy refrigerant degree of superheat be in as described in preset degree of superheat threshold range, then judge further that the described spray enthalpy refrigerant degree of superheat is in increase or is reducing;
When the described spray enthalpy refrigerant degree of superheat increases, judge whether the increase rate of change of the described spray enthalpy refrigerant degree of superheat is greater than to preset and increase rate of change;
As described in increase rate of change be greater than as described in preset and increase rate of change, then the aperture of described spray enthalpy electric expansion valve is increased in the 3rd preset duration default 3rd aperture stride;
When the described spray enthalpy refrigerant degree of superheat reduces, judge whether the reduction rate of change of the described spray enthalpy refrigerant degree of superheat is greater than to preset and reduce rate of change;
As described in reduction rate of change be greater than as described in preset and reduce rate of change, then the aperture of described spray enthalpy electric expansion valve is reduced in the 4th preset duration default 4th aperture stride.
Optionally, also step is comprised:
As described in increase rate of change be less than as described in preset increase rate of change or as described in reduction rate of change be less than and described preset reduction rate of change, then keep the aperture of described spray enthalpy electric expansion valve constant.
A compressor exhaust temperature control system for low-temp. spraying enthalpy heat-flash unit, is applied to the controller of described low-temp. spraying enthalpy heat-flash unit, comprises:
Degree of superheat computing module, for obtaining the spray enthalpy refrigerant degree of superheat of described low-temp. spraying enthalpy heat-flash unit;
Judge module for the first time, for judging whether the described spray enthalpy refrigerant degree of superheat is in default degree of superheat threshold range;
Second judge module, during for judging that when described first judge module the described spray enthalpy refrigerant degree of superheat exceeds described default degree of superheat threshold range, judges the described spray enthalpy refrigerant degree of superheat and the relation described in described default degree of superheat threshold range further;
Control module, during for judging that when the second judge module the described spray enthalpy refrigerant degree of superheat is greater than the higher limit of described default degree of superheat threshold range, the aperture controlling spray enthalpy electric expansion valve increases in the first preset duration presets the first aperture stride; Or for when the described spray enthalpy refrigerant degree of superheat is less than the lower limit of described default degree of superheat threshold range, the aperture controlling described spray enthalpy electric expansion valve reduces to preset the second aperture stride in the second preset duration.
Optionally, described degree of superheat computing module comprises:
Pressure sensing cell, for obtaining the hydrojet pressure of the refrigerant mouth spray of scroll compression pocket;
Temperature detecting unit, for obtaining the actual temperature of described refrigerant mouth spray;
Arithmetic element, for calculating theoretical temperatures corresponding to described hydrojet pressure according to thermodynamics theorem;
Subtrator, for described actual temperature is deducted described theoretical temperatures, obtains the described spray enthalpy refrigerant degree of superheat.
Optionally, also comprise:
3rd judge module, for when with regard to judge module, described first judges that the described spray enthalpy refrigerant degree of superheat is in described default degree of superheat threshold range, judges that the described spray enthalpy refrigerant degree of superheat is in increase or in reduction further;
4th judge module, during for judging that the described spray enthalpy refrigerant degree of superheat increases when described 3rd judge module, judging whether the increase rate of change of the described spray enthalpy refrigerant degree of superheat is greater than to preset further and increasing rate of change;
Described control module is also for when described 4th judge module judges that described increase rate of change is greater than described default increase rate of change, and the aperture controlling described spray enthalpy electric expansion valve increases in the 3rd preset duration presets the 3rd aperture stride;
5th judge module, during for judging that the described spray enthalpy refrigerant degree of superheat reduces when described 3rd judge module, judging whether the reduction rate of change of the described spray enthalpy refrigerant degree of superheat is greater than to preset further and reducing rate of change;
Described control module is also for when described 5th judge module judges that described reduction rate of change is greater than described default reduction rate of change, and the aperture controlling described spray enthalpy electric expansion valve reduces to preset the 4th aperture stride in the 4th preset duration.
Optionally,
When described 5th judge module, described control module is also for judging that described increase rate of change is less than described default increase rate of change, or when described 6th judge module judges that described reduction rate of change is less than described default reduction rate of change, the aperture controlling described spray enthalpy electric expansion valve remains unchanged.
As can be seen from above-mentioned technical scheme, this application discloses a kind of compressor exhaust temperature control method and system of low-temp. spraying enthalpy heat-flash unit, first the method and system obtain the spray enthalpy refrigerant degree of superheat of this unit, again this spray enthalpy refrigerant degree of superheat and default degree of superheat threshold range are compared, if the spray enthalpy refrigerant degree of superheat exceeds the higher limit of default degree of superheat threshold range, the aperture controlling to spray enthalpy electric expansion valve increases presets the first aperture stride, if lower than the lower limit of default degree of superheat threshold range, control this aperture and reduce to preset the second aperture stride, effectively can control the spray enthalpy refrigerant degree of superheat by above method to be within default degree of superheat threshold range.Because the spray enthalpy refrigerant degree of superheat is directly related with compressor exhaust temperature, therefore this method and system effectively can control the stationarity of the compressor exhaust temperature of low-temp. spraying enthalpy heat-flash unit, thus this method and system can be utilized effectively to avoid the potential safety hazard caused because compressor exhaust temperature exceeds safe fluctuation range.
Accompanying drawing explanation
In order to be illustrated more clearly in the embodiment of the present application or technical scheme of the prior art, be briefly described to the accompanying drawing used required in embodiment or description of the prior art below, apparently, accompanying drawing in the following describes is only some embodiments of the application, for those of ordinary skill in the art, under the prerequisite not paying creative work, other accompanying drawing can also be obtained according to these accompanying drawings.
The flow chart of the compressor exhaust temperature control method of a kind of low-temp. spraying enthalpy heat-flash unit that Fig. 1 provides for the embodiment of the present application;
The flow chart of the compressor exhaust temperature control method of a kind of low-temp. spraying enthalpy heat-flash unit that Fig. 2 provides for another embodiment of the application;
The schematic diagram of the compressor exhaust temperature control system of a kind of low-temp. spraying enthalpy heat-flash unit that Fig. 3 provides for the another embodiment of the application;
The schematic diagram of the compressor exhaust temperature control system of a kind of low-temp. spraying enthalpy heat-flash unit that Fig. 4 provides for the another embodiment of the application.
Detailed description of the invention
Below in conjunction with the accompanying drawing in the embodiment of the present application, be clearly and completely described the technical scheme in the embodiment of the present application, obviously, described embodiment is only some embodiments of the present application, instead of whole embodiments.Based on the embodiment in the application, those of ordinary skill in the art are not making the every other embodiment obtained under creative work prerequisite, all belong to the scope of the application's protection.
Find through overtesting and theory calculate, the compressor exhaust temperature of low-temp. spraying enthalpy heat-flash unit has direct relation with the spray enthalpy refrigerant degree of superheat, therefore by just realizing there is direct relation to the stationarity of compressor exhaust temperature to the steady control of the spray enthalpy refrigerant degree of superheat, therefore the application is controlled by the stationarity of method to compressor exhaust temperature controlling the spray enthalpy refrigerant degree of superheat, and detailed description of the invention is described in detail below.
Embodiment one
The flow chart of the compressor exhaust temperature control method of a kind of low-temp. spraying enthalpy heat-flash unit that Fig. 1 provides for the embodiment of the present application.
As shown in Figure 1, the compressor exhaust temperature control method that the present embodiment provides is applied to the controller of this low-temp. spraying enthalpy heat-flash unit, comprises the steps:
S101: obtain the spray enthalpy refrigerant degree of superheat.
First the spray enthalpy refrigerant degree of superheat is obtained by the hydrojet pressure of refrigerant mouth spray and actual temperature.
S102: judge whether the spray enthalpy refrigerant degree of superheat is in default degree of superheat threshold range.
This default degree of superheat threshold range is a default degree of superheat scope, and concrete span is chosen according to actual measurement and empirical equation.Judge whether that being in default degree of superheat threshold range refers between the higher limit whether this spray enthalpy refrigerant degree of superheat is in this default degree of superheat threshold range and lower limit, then performs step S103 if not being between this higher limit and lower limit; If be between this higher limit and lower limit, perform step S106.
S103: the relation judging the spray enthalpy refrigerant degree of superheat and default degree of superheat threshold range.
Namely when this spray enthalpy refrigerant degree of superheat is not within this preheated heat degree threshold scope, the further judgement spray enthalpy refrigerant degree of superheat is greater than the higher limit of this default degree of superheat threshold range or is less than the lower limit of this default degree of superheat threshold range, if the former then performs step S104, if latter performs step S105.
S104: the aperture controlling spray enthalpy electric expansion valve increases presets the first aperture stride.
When the enthalpy refrigerant degree of superheat is greater than the higher limit of this default degree of superheat threshold range, the aperture controlling spray enthalpy electric expansion valve increases in the first preset duration presets the first aperture stride.
S105: the aperture controlling spray enthalpy electric expansion valve reduces to preset the second aperture stride.
When the enthalpy refrigerant degree of superheat is less than the lower limit of this default degree of superheat threshold range, the aperture controlling spray enthalpy electric expansion valve reduces to preset the second aperture stride in the second preset duration.
As can be seen from technique scheme, present embodiments provide a kind of compressor exhaust temperature control method of low-temp. spraying enthalpy heat-flash unit, first the method obtains the spray enthalpy refrigerant degree of superheat of this unit, again this spray enthalpy refrigerant degree of superheat and default degree of superheat threshold range are compared, if the spray enthalpy refrigerant degree of superheat exceeds the higher limit of default degree of superheat threshold range, the aperture controlling to spray enthalpy electric expansion valve increases presets the first aperture stride, if lower than the lower limit of default degree of superheat threshold range, control this aperture and reduce to preset the second aperture stride.Effectively can control the spray enthalpy refrigerant degree of superheat by above method to be within default degree of superheat threshold range.Directly related with compressor exhaust temperature from content mentioned the above known spray enthalpy refrigerant degree of superheat, therefore known, this method effectively can control the stationarity of the compressor exhaust temperature of low-temp. spraying enthalpy heat-flash unit, thus this method can be utilized effectively to avoid the potential safety hazard caused because compressor exhaust temperature exceeds safe fluctuation range.
Preferably, the concrete steps of spraying the acquisition methods of the enthalpy refrigerant degree of superheat in this method are as follows:
S1011: the hydrojet pressure and the actual temperature that obtain refrigerant mouth spray.
Namely hydrojet pressure and the actual temperature of the refrigerant mouth spray of the turbine disk compression chamber of this low-temp. spraying enthalpy heat-flash unit is obtained.
S1012: according to this hydrojet calculation of pressure theoretical temperatures.
The hydrojet pressure of the refrigerant mouth spray got is calculated according to thermodynamics theorem, thus obtains should the theoretical temperatures of hydrojet pressure.
S1013: calculate the spray enthalpy refrigerant degree of superheat according to actual temperature and theoretical temperatures.
The actual actual temperature recorded is deducted this theoretical temperatures and can obtain this spray enthalpy refrigerant degree of superheat.
In addition, in order to obtain the better control effects of compressor exhaust temperature, when spraying the enthalpy refrigerant degree of superheat and being in default degree of superheat threshold range, also further its situation of change judged and take corresponding measure, this application provides another embodiment for this reason and be introduced containing the complete control procedure improving step.
Embodiment two
The flow chart of the compressor exhaust temperature control method of the another kind of low-temp. spraying enthalpy heat-flash unit that Fig. 2 provides for the embodiment of the present application.
As shown in the figure, the compressor exhaust temperature control method that the present embodiment provides is applied to the controller of this low-temp. spraying enthalpy heat-flash unit, comprises the steps:
S201: obtain the spray enthalpy refrigerant degree of superheat.
First the spray enthalpy refrigerant degree of superheat is obtained by the hydrojet pressure of refrigerant mouth spray and actual temperature.
S202: judge whether the spray enthalpy refrigerant degree of superheat is in default degree of superheat threshold range.
This default degree of superheat threshold range is a default degree of superheat scope, and concrete span is chosen according to actual measurement and empirical equation.Judge whether that being in default degree of superheat threshold range refers between the higher limit whether this spray enthalpy refrigerant degree of superheat is in this default degree of superheat threshold range and lower limit, then performs step S203 if not being between this higher limit and lower limit; If be between this higher limit and lower limit, perform step S206.
S203: the relation judging the spray enthalpy refrigerant degree of superheat and default degree of superheat threshold range.
Namely when this spray enthalpy refrigerant degree of superheat is not within this preheated heat degree threshold scope, the further judgement spray enthalpy refrigerant degree of superheat is greater than the higher limit of this default degree of superheat threshold range or is less than the lower limit of this default degree of superheat threshold range, if the former then performs step S204, if latter performs step S105.
S204: the aperture controlling spray enthalpy electric expansion valve increases presets the first aperture stride.
When the enthalpy refrigerant degree of superheat is greater than the higher limit of this default degree of superheat threshold range, the aperture controlling spray enthalpy electric expansion valve increases in the first preset duration presets the first aperture stride.
S205: the aperture controlling spray enthalpy electric expansion valve reduces to preset the second aperture stride.
When the enthalpy refrigerant degree of superheat is less than the lower limit of this default degree of superheat threshold range, the aperture controlling spray enthalpy electric expansion valve reduces to preset the second aperture stride in the second preset duration.
S206: judge that the spray enthalpy refrigerant degree of superheat is in increase or in reduction.
Namely when spraying the enthalpy refrigerant degree of superheat and being within default degree of superheat threshold range, judge the situation of change of this spray enthalpy refrigerant degree of superheat, namely judge that it is in increase or in reduction, if the spray enthalpy refrigerant degree of superheat is in increase, performs step S207, if in reduction, perform step S209.
S207: whether the increase rate of change judging to spray the enthalpy refrigerant degree of superheat is greater than to preset increases rate of change.
Namely when spraying the enthalpy refrigerant degree of superheat in increase, judge whether its increase rate of change is greater than to preset further increase rate of change, if it is execution step S208, otherwise perform step S211.
S208: the aperture of spray enthalpy electric expansion valve is increased and presets the 3rd aperture stride.
Namely, when the increase rate of change spraying the enthalpy refrigerant degree of superheat is greater than default increase rate of change, the aperture of spray enthalpy electric expansion valve is increased in the 3rd preset duration and presets the 3rd aperture stride.
S209: whether the reduction rate of change judging to spray the enthalpy refrigerant degree of superheat is greater than to preset reduces rate of change.
Namely when spraying the enthalpy refrigerant degree of superheat in reduction, judge whether its reduction rate of change is greater than to preset further reduce rate of change, if it is execution step S210, otherwise perform step S211.
S210: the aperture of spray enthalpy electric expansion valve is reduced to preset the 4th aperture stride.
By when the reduction rate of change spraying the enthalpy refrigerant degree of superheat is greater than default reduction rate of change, the aperture of spray enthalpy electric expansion valve is reduced to preset the 4th aperture stride in the 4th preset duration.
In addition, also comprise the steps:
S211: the aperture controlling spray enthalpy electric expansion valve remains unchanged.
Namely, when the increase rate of change of the spray enthalpy refrigerant degree of superheat is less than or equal to default increase rate of change or is less than or equal to default reduction rate of change when the reduction rate of change spraying the enthalpy refrigerant degree of superheat, the aperture that enthalpy electric expansion valve is sprayed in control keeps current aperture constant.
Embodiment three
The schematic diagram of the compressor exhaust temperature control system of the low-temp. spraying enthalpy heat-flash unit that Fig. 3 provides for the another embodiment of the application.
As shown in Figure 3, the compressor exhaust temperature control system that the present embodiment provides comprises degree of superheat computing module 10, first judge module 20, second judge module 30 and control module 40.
Degree of superheat computing module 10, for calculating the hydrojet pressure of refrigerant mouth spray and actual temperature, obtains the spray enthalpy refrigerant degree of superheat.
First judge module 20 is for judging whether the spray enthalpy refrigerant degree of superheat is in default degree of superheat threshold range.
This default degree of superheat threshold range is a default degree of superheat scope, and concrete span is chosen according to actual measurement and empirical equation.Judge whether that being in default degree of superheat threshold range refers between the higher limit whether this spray enthalpy refrigerant degree of superheat is in this default degree of superheat threshold range and lower limit, then export first between this higher limit and lower limit exceed signal if not being in; If be between this higher limit and lower limit, exported first and do not exceed signal.
Second judge module 30 is for first exceeding signal according to this and judge the spray enthalpy refrigerant degree of superheat and the relation of default degree of superheat threshold range.
Namely when this spray enthalpy refrigerant degree of superheat is not within this preheated heat degree threshold scope, the further judgement spray enthalpy refrigerant degree of superheat is greater than the higher limit of this default degree of superheat threshold range or is less than the lower limit of this default degree of superheat threshold range, if the former then exports the first increase signal, if latter exports first reduce signal.
Control module 40 is for increasing according to first the default first aperture stride of aperture increase that signal controls spray enthalpy electric expansion valve, namely, when the enthalpy refrigerant degree of superheat is greater than the higher limit of this default degree of superheat threshold range, the aperture controlling spray enthalpy electric expansion valve increases in the first preset duration presets the first aperture stride; Also for reducing according to first the default second aperture stride of aperture reduction that signal controls spray enthalpy electric expansion valve, when the enthalpy refrigerant degree of superheat is less than the lower limit of this default degree of superheat threshold range, the aperture controlling spray enthalpy electric expansion valve reduces to preset the second aperture stride in the second preset duration.
As can be seen from technique scheme, present embodiments provide a kind of compressor exhaust temperature control system of low-temp. spraying enthalpy heat-flash unit, this system comprises degree of superheat computing module, the first judge module, the second judge module and control module.Degree of superheat computing module is for obtaining the spray enthalpy refrigerant degree of superheat of this unit, this spray enthalpy refrigerant degree of superheat and default degree of superheat threshold range then compare by the first judge module, when 3rd judge module is then for judging that at the first judge module the spray enthalpy refrigerant degree of superheat exceeds default degree of superheat threshold range, the relation of the spray enthalpy refrigerant degree of superheat and default degree of superheat threshold range is judged, the first aperture stride is preset in the aperture increase that control module is used for controlling when spraying the enthalpy refrigerant degree of superheat and exceeding the higher limit of the default degree of superheat threshold range spray enthalpy electric expansion valve, or the aperture controlling this spray enthalpy electric expansion valve when spraying the lower limit of the enthalpy refrigerant degree of superheat lower than default degree of superheat threshold range reduces to preset the second aperture stride.Default degree of superheat threshold range is in by controlling effectively to control the spray enthalpy refrigerant degree of superheat above.Directly related with compressor exhaust temperature from content mentioned the above known spray enthalpy refrigerant degree of superheat, therefore known, native system effectively can control the stationarity of the compressor exhaust temperature of low-temp. spraying enthalpy heat-flash unit, thus this method can be utilized effectively to avoid the potential safety hazard caused because compressor exhaust temperature exceeds safe fluctuation range.
In addition, this degree of superheat computing module 10 comprises pressure sensing cell, temperature detecting unit, arithmetic element and subtrator.
Pressure sensing cell is for obtaining the hydrojet pressure of the refrigerant mouth spray of scroll compression pocket; Temperature detecting unit is for obtaining the actual temperature of refrigerant mouth spray; Arithmetic element is used for calculating theoretical temperatures corresponding to hydrojet pressure according to thermodynamics theorem; Subtrator then finally obtains the spray enthalpy refrigerant degree of superheat for actual temperature being deducted theoretical temperatures.
Embodiment four
The schematic diagram of the compressor exhaust temperature control system of the low-temp. spraying enthalpy heat-flash unit that Fig. 4 provides for the another embodiment of the application.
As shown in Figure 4, in order to obtain the better control effects of compressor exhaust temperature, when spraying the enthalpy refrigerant degree of superheat and being in default degree of superheat threshold range, also further its situation of change judged and take corresponding measure, being specially and having set up the 3rd judge module, the 4th judge module and the 5th judge module on the basis of a upper embodiment.
When 3rd judge module 50 is for judging that when the first judge module 20 the spray enthalpy refrigerant degree of superheat is in default degree of superheat scope, the further judgement spray enthalpy refrigerant degree of superheat is in increase or in reduction, if the spray enthalpy refrigerant degree of superheat, in increase, exports and increases process signal, if in reduction, export and reduce process signal.
Whether the 4th judge module 60 is greater than to preset for the increase rate of change judging to spray the enthalpy refrigerant degree of superheat according to this increase process signal increases rate of change, namely when spraying the enthalpy refrigerant degree of superheat in increase, judge whether its increase rate of change is greater than to preset further increase rate of change, if it is export second and increase signal, otherwise export normal opening amount signal.
Whether the 5th judge module 70 is greater than to preset for the reduction rate of change judging to spray the enthalpy refrigerant degree of superheat reduces rate of change, namely when spraying the enthalpy refrigerant degree of superheat in reduction, judge whether its reduction rate of change is greater than to preset further reduce rate of change, if it is export second and reduce signal, otherwise export normal opening amount signal.
The aperture of above-mentioned control module 40 also for controlling spray enthalpy electric expansion valve according to the second increase signal increases in the 3rd preset duration presets the 3rd aperture stride, or reduces to preset the 4th aperture stride in the 4th preset duration according to the second aperture reducing signal control spray enthalpy electric expansion valve.
In addition, control module 40 also keeps current aperture constant for controlling aperture according to normal opening amount signal.Namely be greater than and preset the aperture increasing rate of change or reduce to control when rate of change is less than and presets and reduce rate of change spray enthalpy electric expansion valve and remain unchanged increasing rate of change.
In this description, each embodiment adopts the mode of going forward one by one to describe, and what each embodiment stressed is the difference with other embodiments, between each embodiment identical similar portion mutually see.To the above-mentioned explanation of the disclosed embodiments, professional and technical personnel in the field are realized or uses the application.To be apparent for those skilled in the art to the multiple amendment of these embodiments, General Principle as defined herein when not departing from the spirit or scope of the application, can realize in other embodiments.Therefore, the application can not be restricted to these embodiments shown in this article, but will meet the widest scope consistent with principle disclosed herein and features of novelty.
Claims (8)
1. a compressor exhaust temperature control method for low-temp. spraying enthalpy heat-flash unit, is applied to the controller of described low-temp. spraying enthalpy heat-flash unit, it is characterized in that, comprise step:
Obtain the spray enthalpy refrigerant degree of superheat of described low-temp. spraying enthalpy heat-flash unit;
Judge whether the described spray enthalpy refrigerant degree of superheat is in default degree of superheat threshold range;
As described in the spray enthalpy refrigerant degree of superheat exceed as described in preset degree of superheat threshold range, then judge the described spray enthalpy refrigerant degree of superheat and the relation described in described default degree of superheat threshold range further;
As described in the spray enthalpy refrigerant degree of superheat be greater than as described in preset the higher limit of degree of superheat threshold range, then in the first preset duration, the aperture of spray enthalpy electric expansion valve is increased and presets the first aperture stride;
As described in the spray enthalpy refrigerant degree of superheat be less than as described in preset the lower limit of degree of superheat threshold range, then the aperture of described spray enthalpy electric expansion valve is reduced to preset the second aperture stride in the second preset duration.
2. compressor exhaust temperature control method as claimed in claim 1, it is characterized in that, the spray enthalpy refrigerant degree of superheat of described acquisition described low-temp. spraying enthalpy heat-flash unit, comprising:
Obtain hydrojet pressure and the actual temperature of the refrigerant mouth spray of scroll compression pocket;
Theoretical temperatures corresponding to described hydrojet pressure is calculated according to thermodynamics theorem;
Described actual temperature is deducted described theoretical temperatures, obtains the described spray enthalpy refrigerant degree of superheat.
3. compressor exhaust temperature control method as claimed in claim 1 or 2, is characterized in that, also comprise step:
As described in the spray enthalpy refrigerant degree of superheat be in as described in preset degree of superheat threshold range, then judge further that the described spray enthalpy refrigerant degree of superheat is in increase or is reducing;
When the described spray enthalpy refrigerant degree of superheat increases, judge whether the increase rate of change of the described spray enthalpy refrigerant degree of superheat is greater than to preset and increase rate of change;
As described in increase rate of change be greater than as described in preset and increase rate of change, then the aperture of described spray enthalpy electric expansion valve is increased in the 3rd preset duration default 3rd aperture stride;
When the described spray enthalpy refrigerant degree of superheat reduces, judge whether the reduction rate of change of the described spray enthalpy refrigerant degree of superheat is greater than to preset and reduce rate of change;
As described in reduction rate of change be greater than as described in preset and reduce rate of change, then the aperture of described spray enthalpy electric expansion valve is reduced in the 4th preset duration default 4th aperture stride.
4. compressor exhaust temperature control method as claimed in claim 3, is characterized in that, also comprise step:
As described in increase rate of change be less than as described in preset increase rate of change or as described in reduction rate of change be less than and described preset reduction rate of change, then keep the aperture of described spray enthalpy electric expansion valve constant.
5. a compressor exhaust temperature control system for low-temp. spraying enthalpy heat-flash unit, is applied to the controller of described low-temp. spraying enthalpy heat-flash unit, it is characterized in that, comprising:
Degree of superheat computing module, for obtaining the spray enthalpy refrigerant degree of superheat of described low-temp. spraying enthalpy heat-flash unit;
Judge module for the first time, for judging whether the described spray enthalpy refrigerant degree of superheat is in default degree of superheat threshold range;
Second judge module, during for judging that when described first judge module the described spray enthalpy refrigerant degree of superheat exceeds described default degree of superheat threshold range, judges the described spray enthalpy refrigerant degree of superheat and the relation described in described default degree of superheat threshold range further;
Control module, during for judging that when the second judge module the described spray enthalpy refrigerant degree of superheat is greater than the higher limit of described default degree of superheat threshold range, the aperture controlling spray enthalpy electric expansion valve increases in the first preset duration presets the first aperture stride; Or for when the described spray enthalpy refrigerant degree of superheat is less than the lower limit of described default degree of superheat threshold range, the aperture controlling described spray enthalpy electric expansion valve reduces to preset the second aperture stride in the second preset duration.
6. compressor exhaust temperature control system as claimed in claim 5, it is characterized in that, described degree of superheat computing module comprises:
Pressure sensing cell, for obtaining the hydrojet pressure of the refrigerant mouth spray of scroll compression pocket;
Temperature detecting unit, for obtaining the actual temperature of described refrigerant mouth spray;
Arithmetic element, for calculating theoretical temperatures corresponding to described hydrojet pressure according to thermodynamics theorem;
Subtrator, for described actual temperature is deducted described theoretical temperatures, obtains the described spray enthalpy refrigerant degree of superheat.
7. the compressor exhaust temperature control system as described in claim 5 or 6, is characterized in that, also comprise:
3rd judge module, for when with regard to judge module, described first judges that the described spray enthalpy refrigerant degree of superheat is in described default degree of superheat threshold range, judges that the described spray enthalpy refrigerant degree of superheat is in increase or in reduction further;
4th judge module, during for judging that the described spray enthalpy refrigerant degree of superheat increases when described 3rd judge module, judging whether the increase rate of change of the described spray enthalpy refrigerant degree of superheat is greater than to preset further and increasing rate of change;
Described control module is also for when described 4th judge module judges that described increase rate of change is greater than described default increase rate of change, and the aperture controlling described spray enthalpy electric expansion valve increases in the 3rd preset duration presets the 3rd aperture stride;
5th judge module, during for judging that the described spray enthalpy refrigerant degree of superheat reduces when described 3rd judge module, judging whether the reduction rate of change of the described spray enthalpy refrigerant degree of superheat is greater than to preset further and reducing rate of change;
Described control module is also for when described 5th judge module judges that described reduction rate of change is greater than described default reduction rate of change, and the aperture controlling described spray enthalpy electric expansion valve reduces to preset the 4th aperture stride in the 4th preset duration.
8. compressor exhaust temperature control system as claimed in claim 7, is characterized in that,
When described 5th judge module, described control module is also for judging that described increase rate of change is less than described default increase rate of change, or when described 6th judge module judges that described reduction rate of change is less than described default reduction rate of change, the aperture controlling described spray enthalpy electric expansion valve remains unchanged.
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106642520A (en) * | 2016-09-21 | 2017-05-10 | 珠海格力电器股份有限公司 | Method, system and device of air injection of air conditioning system and air conditioner |
| CN106766376A (en) * | 2016-12-30 | 2017-05-31 | 珠海格力电器股份有限公司 | A kind of source pump adjusting method, device and air-conditioning |
| CN106766335A (en) * | 2017-01-10 | 2017-05-31 | 珠海格力电器股份有限公司 | Control method for electronic expansion valve, device and source pump |
| CN106895620A (en) * | 2017-01-16 | 2017-06-27 | 珠海格力电器股份有限公司 | Spray system control method, device and air-conditioner set |
| CN106931546A (en) * | 2017-03-27 | 2017-07-07 | 广东美的制冷设备有限公司 | A kind of heat pump sprays enthalpy system and its control method, air-conditioner |
| CN110195925A (en) * | 2019-05-31 | 2019-09-03 | 宁波奥克斯电气股份有限公司 | A kind of control method and air conditioner of low-temperature air source heat pump spray enthalpy valve |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2000039220A (en) * | 1998-05-19 | 2000-02-08 | Mitsubishi Electric Corp | Apparatus and method for controlling refrigerating cycle |
| CN202692341U (en) * | 2012-08-02 | 2013-01-23 | 珠海格力电器股份有限公司 | Air conditioning circulation system |
| CN103411291A (en) * | 2013-08-30 | 2013-11-27 | 海信（山东）空调有限公司 | Expansion valve injection control method and system |
| CN103512153A (en) * | 2013-07-16 | 2014-01-15 | 广东美芝制冷设备有限公司 | Air-conditioning system with enthalpy increased through vapor injection and control method thereof |
| CN203432025U (en) * | 2013-08-30 | 2014-02-12 | 海信（山东）空调有限公司 | Expansion valve ejection control system |
| CN104566839A (en) * | 2015-02-02 | 2015-04-29 | 珠海格力电器股份有限公司 | Control method for enhanced vapor injection of air conditioner system |
-
2015
- 2015-10-14 CN CN201510660758.2A patent/CN105180540B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2000039220A (en) * | 1998-05-19 | 2000-02-08 | Mitsubishi Electric Corp | Apparatus and method for controlling refrigerating cycle |
| CN202692341U (en) * | 2012-08-02 | 2013-01-23 | 珠海格力电器股份有限公司 | Air conditioning circulation system |
| CN103512153A (en) * | 2013-07-16 | 2014-01-15 | 广东美芝制冷设备有限公司 | Air-conditioning system with enthalpy increased through vapor injection and control method thereof |
| CN103411291A (en) * | 2013-08-30 | 2013-11-27 | 海信（山东）空调有限公司 | Expansion valve injection control method and system |
| CN203432025U (en) * | 2013-08-30 | 2014-02-12 | 海信（山东）空调有限公司 | Expansion valve ejection control system |
| CN104566839A (en) * | 2015-02-02 | 2015-04-29 | 珠海格力电器股份有限公司 | Control method for enhanced vapor injection of air conditioner system |
Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106642520A (en) * | 2016-09-21 | 2017-05-10 | 珠海格力电器股份有限公司 | Method, system and device of air injection of air conditioning system and air conditioner |
| CN106642520B (en) * | 2016-09-21 | 2019-08-06 | 珠海格力电器股份有限公司 | Gas puff Z-pinch method, system, device and the air conditioner of air-conditioning system |
| CN106766376A (en) * | 2016-12-30 | 2017-05-31 | 珠海格力电器股份有限公司 | A kind of source pump adjusting method, device and air-conditioning |
| CN106766376B (en) * | 2016-12-30 | 2019-11-01 | 珠海格力电器股份有限公司 | A kind of heat pump unit adjusting method, device and air-conditioning |
| CN106766335A (en) * | 2017-01-10 | 2017-05-31 | 珠海格力电器股份有限公司 | Control method for electronic expansion valve, device and source pump |
| CN106766335B (en) * | 2017-01-10 | 2019-03-12 | 珠海格力电器股份有限公司 | Control method for electronic expansion valve, device and heat pump unit |
| CN106895620A (en) * | 2017-01-16 | 2017-06-27 | 珠海格力电器股份有限公司 | Spray system control method, device and air-conditioner set |
| CN106895620B (en) * | 2017-01-16 | 2022-04-01 | 珠海格力电器股份有限公司 | Liquid spraying system control method and device and air conditioning unit |
| CN106931546A (en) * | 2017-03-27 | 2017-07-07 | 广东美的制冷设备有限公司 | A kind of heat pump sprays enthalpy system and its control method, air-conditioner |
| CN106931546B (en) * | 2017-03-27 | 2023-10-31 | 广东美的制冷设备有限公司 | Heat pump enthalpy-spraying system, control method thereof and air conditioner |
| CN110195925A (en) * | 2019-05-31 | 2019-09-03 | 宁波奥克斯电气股份有限公司 | A kind of control method and air conditioner of low-temperature air source heat pump spray enthalpy valve |
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