CN105180540B - A kind of the compressor exhaust temperature control method and system of low-temp. spraying enthalpy heat-flash unit - Google Patents
A kind of the compressor exhaust temperature control method and system of low-temp. spraying enthalpy heat-flash unit Download PDFInfo
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- CN105180540B CN105180540B CN201510660758.2A CN201510660758A CN105180540B CN 105180540 B CN105180540 B CN 105180540B CN 201510660758 A CN201510660758 A CN 201510660758A CN 105180540 B CN105180540 B CN 105180540B
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Abstract
This application discloses the compressor exhaust temperature control methods and system of a kind of low-temp. spraying enthalpy heat-flash unit, this method and system obtain the spray enthalpy refrigerant degree of superheat of the unit first, the spray enthalpy refrigerant degree of superheat is compared with default degree of superheat threshold range again, the aperture that spray enthalpy electric expansion valve is controlled if the spray enthalpy refrigerant degree of superheat exceeds the upper limit value of default degree of superheat threshold range increases default first aperture stride, the aperture, which is controlled, if lower than the lower limit value of default degree of superheat threshold range reduces default second aperture stride, the spray enthalpy refrigerant degree of superheat can be effectively controlled by above method to be within default degree of superheat threshold range.Since the spray enthalpy refrigerant degree of superheat is directly related with compressor exhaust temperature, therefore this method and system can effectively control the stationarity of the compressor exhaust temperature of low-temp. spraying enthalpy heat-flash unit, so as to effectively be avoided using this method and system because compressor exhaust temperature is beyond security risk caused by safe fluctuation range.
Description
Technical field
This application involves refrigeration technology fields, arrange more specifically to a kind of compressor of low-temp. spraying enthalpy heat-flash unit
Gas temprature control method and system.
Background technique
The method raising that refrigerant is sprayed in the scroll compression pocket of compressor is usually used in low-temp. spraying enthalpy heat-flash unit
Heating capacity of unit at a temperature of ultralow environment, but the unit of this method is taken often to will appear compressor air-discharging temperature
Degree fluctuation is larger, can even exceed safe fluctuation range sometimes, so that the safe operation to unit brings hidden danger.
Summary of the invention
In view of this, the application provides a kind of compressor exhaust temperature control method of low-temp. spraying enthalpy heat-flash unit and is
System, is in stability range for controlling compressor exhaust temperature, fluctuates to avoid the fluctuation of compressor exhaust temperature beyond safety
Range.
To achieve the goals above, it is proposed that scheme it is as follows：
A kind of compressor exhaust temperature control method of low-temp. spraying enthalpy heat-flash unit is applied to the low-temp. spraying enthalpy heat-flash machine
The controller of group, including step：
Obtain the spray enthalpy refrigerant degree of superheat of the low-temp. spraying enthalpy heat-flash unit；
Judge whether the spray enthalpy refrigerant degree of superheat is in default degree of superheat threshold range；
If the spray enthalpy refrigerant degree of superheat exceeds the default degree of superheat threshold range, then further judge that the spray enthalpy is cold
Relationship described in matchmaker's degree of superheat and the default degree of superheat threshold range；
If the spray enthalpy refrigerant degree of superheat is greater than the upper limit value of the default degree of superheat threshold range, then when first is default
The aperture for spraying enthalpy electric expansion valve is increased into default first aperture stride in long；
If the spray enthalpy refrigerant degree of superheat is less than the lower limit value of the default degree of superheat threshold range, then when second is default
The aperture of the spray enthalpy electric expansion valve is reduced into default second aperture stride in long.
Optionally, the spray enthalpy refrigerant degree of superheat for obtaining the low-temp. spraying enthalpy heat-flash unit, including：
Obtain the hydrojet pressure and actual temperature of the refrigerant mouth spray of scroll compression pocket；
The corresponding theoretical temperatures of the hydrojet pressure are calculated according to thermodynamics theorem；
The actual temperature is subtracted into the theoretical temperatures, obtains the spray enthalpy refrigerant degree of superheat.
It optionally, further include step：
If the spray enthalpy refrigerant degree of superheat is in the default degree of superheat threshold range, then further judge that the spray enthalpy is cold
Matchmaker's degree of superheat is to increase or reducing；
When the spray enthalpy refrigerant degree of superheat increases, judge whether the increase change rate of the spray enthalpy refrigerant degree of superheat is greater than
It is default to increase change rate；
If the increase change rate is greater than the default increase change rate, then the aperture of the spray enthalpy electric expansion valve is existed
Increase default third aperture stride in third preset duration；
When the spray enthalpy refrigerant degree of superheat reduces, judge whether the reduction change rate of the spray enthalpy refrigerant degree of superheat is greater than
It is default to reduce change rate；
If the reduction change rate is greater than the default reduction change rate, then the aperture of the spray enthalpy electric expansion valve is existed
Reduce default 4th aperture stride in 4th preset duration.
It optionally, further include step：
Subtract as the increase change rate is less than the default increase change rate or the reduction change rate less than described preset
Small change rate then keeps the aperture of the spray enthalpy electric expansion valve constant.
A kind of compressor exhaust temperature control system of low-temp. spraying enthalpy heat-flash unit is applied to the low-temp. spraying enthalpy heat-flash machine
The controller of group, including：
Degree of superheat computing module, for obtaining the spray enthalpy refrigerant degree of superheat of the low-temp. spraying enthalpy heat-flash unit；
First time judgment module, for judging whether the spray enthalpy refrigerant degree of superheat is in default degree of superheat threshold range；
Second judgment module, for determining the spray enthalpy refrigerant degree of superheat beyond described default when the first judgment module
When degree of superheat threshold range, pass described in the spray enthalpy refrigerant degree of superheat and the default degree of superheat threshold range is further judged
System；
Control module, for determining that the spray enthalpy refrigerant degree of superheat is greater than the default degree of superheat threshold when the second judgment module
When being worth the upper limit value of range, the aperture of control spray enthalpy electric expansion valve increases default first aperture step in the first preset duration
Width；Or for controlling the spray when the spray enthalpy refrigerant degree of superheat is less than the lower limit value of the default degree of superheat threshold range
The aperture of enthalpy electric expansion valve reduces default second aperture stride in the second preset duration.
Optionally, the degree of superheat computing module includes：
Pressure sensing cell, the hydrojet pressure of the refrigerant mouth spray for obtaining scroll compression pocket；
Temperature detecting unit, for obtaining the actual temperature of the refrigerant mouth spray；
Arithmetic element, for calculating the corresponding theoretical temperatures of the hydrojet pressure according to thermodynamics theorem；
Subtrator obtains the spray enthalpy refrigerant degree of superheat for the actual temperature to be subtracted the theoretical temperatures.
Optionally, further include：
Third judgment module is judged as the module judgement spray enthalpy refrigerant degree of superheat in described pre- for working as described first
If when degree of superheat threshold range, further judging that the spray enthalpy refrigerant degree of superheat is to increase or reducing；
4th judgment module is used for when the third judgment module determines that the spray enthalpy refrigerant degree of superheat increases, into one
Step judges whether the increase change rate of the spray enthalpy refrigerant degree of superheat is greater than default increase change rate；
The control module is also used to determine that the increase change rate is greater than the default increasing when the 4th judgment module
When big change rate, the aperture for controlling the spray enthalpy electric expansion valve increases default third aperture stride in third preset duration；
5th judgment module is used for when the third judgment module determines that the spray enthalpy refrigerant degree of superheat reduces, into one
Step judges whether the reduction change rate of the spray enthalpy refrigerant degree of superheat is greater than default reduction change rate；
The control module is also used to determine that the reduction change rate is greater than described preset and subtracts when the 5th judgment module
When small change rate, the aperture for controlling the spray enthalpy electric expansion valve reduces default 4th aperture stride in the 4th preset duration.
Optionally,
The control module is also used to determine that the increase change rate is less than the default increasing when the 5th judgment module
Big change rate, or when the 6th judgment module determines that the reduction change rate is less than the default reduction change rate, control
The aperture for making the spray enthalpy electric expansion valve remains unchanged.
It can be seen from the above technical scheme that this application discloses a kind of compressor air-dischargings of low-temp. spraying enthalpy heat-flash unit
Temprature control method and system, this method and system obtain the spray enthalpy refrigerant degree of superheat of the unit first, then by the spray enthalpy refrigerant
The degree of superheat is compared with default degree of superheat threshold range, if the spray enthalpy refrigerant degree of superheat exceeds default degree of superheat threshold range
The aperture that upper limit value then controls spray enthalpy electric expansion valve increases default first aperture stride, if lower than default degree of superheat threshold value model
The lower limit value enclosed then controls the aperture and reduces default second aperture stride, and spray enthalpy refrigerant overheat can be effectively controlled by above method
Degree is within default degree of superheat threshold range.Since the spray enthalpy refrigerant degree of superheat is directly related with compressor exhaust temperature,
This method and system can effectively control the stationarity of the compressor exhaust temperature of low-temp. spraying enthalpy heat-flash unit, so as to utilize
This method and system are effectively avoided because compressor exhaust temperature is beyond security risk caused by safe fluctuation range.
Detailed description of the invention
In order to illustrate the technical solutions in the embodiments of the present application or in the prior art more clearly, to embodiment or will show below
There is attached drawing needed in technical description to be briefly described, it should be apparent that, the accompanying drawings in the following description is only this
Some embodiments of application for those of ordinary skill in the art without creative efforts, can be with
It obtains other drawings based on these drawings.
Fig. 1 is a kind of compressor exhaust temperature control method of low-temp. spraying enthalpy heat-flash unit provided by the embodiments of the present application
Flow chart；
Fig. 2 is a kind of compressor exhaust temperature controlling party for low-temp. spraying enthalpy heat-flash unit that another embodiment of the application provides
The flow chart of method；
Fig. 3 is a kind of compressor exhaust temperature control system for low-temp. spraying enthalpy heat-flash unit that the another embodiment of the application provides
The schematic diagram of system；
Fig. 4 is a kind of compressor exhaust temperature control system for low-temp. spraying enthalpy heat-flash unit that the another embodiment of the application provides
The schematic diagram of system.
Specific embodiment
Below in conjunction with the attached drawing in the embodiment of the present application, technical solutions in the embodiments of the present application carries out clear, complete
Site preparation description, it is clear that described embodiments are only a part of embodiments of the present application, instead of all the embodiments.It is based on
Embodiment in the application, it is obtained by those of ordinary skill in the art without making creative efforts every other
Embodiment shall fall in the protection scope of this application.
It is found through overtesting and theoretical calculation, the compressor exhaust temperature and spray enthalpy refrigerant overheat of low-temp. spraying enthalpy heat-flash unit
Degree has direct relation, therefore can be realized as putting down compressor exhaust temperature by the steady control to the spray enthalpy refrigerant degree of superheat
Stability has direct relationship, therefore the application sprays the method for the enthalpy refrigerant degree of superheat to the steady of compressor exhaust temperature by control
Property is controlled, and specific embodiment is described in detail below.
Embodiment one
Fig. 1 is a kind of compressor exhaust temperature control method of low-temp. spraying enthalpy heat-flash unit provided by the embodiments of the present application
Flow chart.
As shown in Figure 1, compressor exhaust temperature control method provided in this embodiment is applied to the low-temp. spraying enthalpy heat-flash machine
The controller of group, includes the following steps：
S101：Obtain the spray enthalpy refrigerant degree of superheat.
The spray enthalpy refrigerant degree of superheat is obtained by the hydrojet pressure and actual temperature of refrigerant mouth spray first.
S102：Judge to spray whether the enthalpy refrigerant degree of superheat is in default degree of superheat threshold range.
The default degree of superheat threshold range is a preset degree of superheat range, specific value range according to actual measurement and
Empirical equation is chosen.Judge whether to refer to whether the spray enthalpy refrigerant degree of superheat is in this in default degree of superheat threshold range
Between the upper limit value and lower limit value of default degree of superheat threshold range, then executed between the upper limit value and lower limit value if not being in
Step S103；If in S106 is thened follow the steps between the upper limit value and lower limit value.
S103：The relationship of judgement spray the enthalpy refrigerant degree of superheat and default degree of superheat threshold range.
I.e. when the spray enthalpy refrigerant degree of superheat is not within the scope of the preheated heat degree threshold, further enthalpy refrigerant is sprayed in judgement
The upper limit value that the degree of superheat is greater than the default degree of superheat threshold range is also less than the lower limit value of the default degree of superheat threshold range,
S104 is thened follow the steps if it is the former, thens follow the steps S105 if it is the latter.
S104：The aperture of control spray enthalpy electric expansion valve increases default first aperture stride.
When the enthalpy refrigerant degree of superheat is greater than the upper limit value of the default degree of superheat threshold range, control spray enthalpy electric expansion valve
Aperture increases default first aperture stride in the first preset duration.
S105：The aperture of control spray enthalpy electric expansion valve reduces default second aperture stride.
When the enthalpy refrigerant degree of superheat is less than the lower limit value of the default degree of superheat threshold range, control spray enthalpy electric expansion valve
Aperture reduces default second aperture stride in the second preset duration.
It can be seen from the above technical proposal that present embodiments providing a kind of compressor air-discharging of low-temp. spraying enthalpy heat-flash unit
Temprature control method, this method obtains the spray enthalpy refrigerant degree of superheat of the unit first, then by the spray enthalpy refrigerant degree of superheat and presets
Degree of superheat threshold range is compared, and is controlled if the spray enthalpy refrigerant degree of superheat exceeds the upper limit value of default degree of superheat threshold range
The aperture for spraying enthalpy electric expansion valve increases default first aperture stride, if lower than the lower limit value of default degree of superheat threshold range
It controls the aperture and reduces default second aperture stride.By above method can be effectively controlled spray the enthalpy refrigerant degree of superheat be in preset
Within the scope of heat degree threshold.From the spray enthalpy refrigerant degree of superheat and the direct phase of compressor exhaust temperature known to content mentioned above
It closes, thus, it can be known that this method can effectively control the stationarity of the compressor exhaust temperature of low-temp. spraying enthalpy heat-flash unit, so as to
It is enough effectively avoided using this method because compressor exhaust temperature is beyond security risk caused by safe fluctuation range.
Preferably, in this method spray the enthalpy refrigerant degree of superheat acquisition methods specific step is as follows：
S1011：Obtain the hydrojet pressure and actual temperature of refrigerant mouth spray.
Obtain the hydrojet pressure and practical temperature of the refrigerant mouth spray of the turbine disk compression chamber of the low-temp. spraying enthalpy heat-flash unit
Degree.
S1012：Theoretical temperature is calculated according to the hydrojet pressure.
The hydrojet pressure of the refrigerant mouth spray got is calculated according to thermodynamics theorem, to obtain corresponding to the spray
The theoretical temperatures of hydraulic coupling.
S1013：The spray enthalpy refrigerant degree of superheat is calculated according to actual temperature and theoretical temperatures.
Actually measured actual temperature, which is subtracted the theoretical temperatures, can be obtained the spray enthalpy refrigerant degree of superheat.
In addition, being in default in the spray enthalpy refrigerant degree of superheat to obtain to the better control effect of compressor exhaust temperature
When in degree of superheat threshold range, corresponding measure is also further judged its situation of change and taken, the application provides thus
Another embodiment is introduced to the complete control process for improving step is contained.
Embodiment two
Fig. 2 is the compressor exhaust temperature control method of another low-temp. spraying enthalpy heat-flash unit provided by the embodiments of the present application
Flow chart.
As shown, compressor exhaust temperature control method provided in this embodiment is applied to the low-temp. spraying enthalpy heat-flash unit
Controller, include the following steps：
S201：Obtain the spray enthalpy refrigerant degree of superheat.
The spray enthalpy refrigerant degree of superheat is obtained by the hydrojet pressure and actual temperature of refrigerant mouth spray first.
S202：Judge to spray whether the enthalpy refrigerant degree of superheat is in default degree of superheat threshold range.
The default degree of superheat threshold range is a preset degree of superheat range, specific value range according to actual measurement and
Empirical equation is chosen.Judge whether to refer to whether the spray enthalpy refrigerant degree of superheat is in this in default degree of superheat threshold range
Between the upper limit value and lower limit value of default degree of superheat threshold range, then executed between the upper limit value and lower limit value if not being in
Step S203；If in S206 is thened follow the steps between the upper limit value and lower limit value.
S203：The relationship of judgement spray the enthalpy refrigerant degree of superheat and default degree of superheat threshold range.
I.e. when the spray enthalpy refrigerant degree of superheat is not within the scope of the preheated heat degree threshold, further enthalpy refrigerant is sprayed in judgement
The upper limit value that the degree of superheat is greater than the default degree of superheat threshold range is also less than the lower limit value of the default degree of superheat threshold range,
S204 is thened follow the steps if it is the former, thens follow the steps S105 if it is the latter.
S204：The aperture of control spray enthalpy electric expansion valve increases default first aperture stride.
When the enthalpy refrigerant degree of superheat is greater than the upper limit value of the default degree of superheat threshold range, control spray enthalpy electric expansion valve
Aperture increases default first aperture stride in the first preset duration.
S205：The aperture of control spray enthalpy electric expansion valve reduces default second aperture stride.
When the enthalpy refrigerant degree of superheat is less than the lower limit value of the default degree of superheat threshold range, control spray enthalpy electric expansion valve
Aperture reduces default second aperture stride in the second preset duration.
S206：The judgement spray enthalpy refrigerant degree of superheat is to increase or reducing.
I.e. when spraying the enthalpy refrigerant degree of superheat within default degree of superheat threshold range, the spray enthalpy refrigerant degree of superheat is judged
Situation of change judges that it is to increase or reducing, if the spray enthalpy refrigerant degree of superheat thens follow the steps S207 in increase, such as
Fruit thens follow the steps S209 in reduction.
S207：Judge whether the increase change rate for spraying the enthalpy refrigerant degree of superheat is greater than default increase change rate.
I.e. when the spray enthalpy refrigerant degree of superheat further judges that it increases whether change rate is greater than default increasing in the case where increase
Big change rate, it is no to then follow the steps S211 if it is thening follow the steps S208.
S208：The default third aperture stride of aperture increase of enthalpy electric expansion valve will be sprayed.
It is i.e. in the case where the increase change rate for spraying the enthalpy refrigerant degree of superheat is greater than default increase change rate, spray enthalpy electronics is swollen
The aperture of swollen valve increases default third aperture stride in third preset duration.
S209：Judge whether the reduction change rate for spraying the enthalpy refrigerant degree of superheat is greater than default reduction change rate.
I.e. when the spray enthalpy refrigerant degree of superheat further judges that it reduces whether change rate is greater than default subtract in the case where reduction
Small change rate, it is no to then follow the steps S211 if it is thening follow the steps S210.
S210：The aperture for spraying enthalpy electric expansion valve is reduced into default 4th aperture stride.
By in the case where the reduction change rate for spraying the enthalpy refrigerant degree of superheat is greater than default reduction change rate, by spraying, enthalpy electronics is swollen
The aperture of swollen valve reduces default 4th aperture stride in the 4th preset duration.
In addition, further including following steps：
S211：The aperture of control spray enthalpy electric expansion valve remains unchanged.
I.e. when the increase change rate of the spray enthalpy refrigerant degree of superheat is less than or equal to default increase change rate or when spray enthalpy refrigerant
When the reduction change rate of the degree of superheat is less than or equal to default reduction change rate, the aperture of control spray enthalpy electric expansion valve keeps current
Aperture is constant.
Embodiment three
Fig. 3 is the compressor exhaust temperature control system for the low-temp. spraying enthalpy heat-flash unit that the another embodiment of the application provides
Schematic diagram.
As shown in figure 3, compressor exhaust temperature control system provided in this embodiment includes degree of superheat computing module 10,
One judgment module 20, the second judgment module 30 and control module 40.
Degree of superheat computing module 10 obtains spray enthalpy for calculating the hydrojet pressure and actual temperature of refrigerant mouth spray
The refrigerant degree of superheat.
First judgment module 20 sprays whether the enthalpy refrigerant degree of superheat is in default degree of superheat threshold range for judging.
The default degree of superheat threshold range is a preset degree of superheat range, specific value range according to actual measurement and
Empirical equation is chosen.Judge whether to refer to whether the spray enthalpy refrigerant degree of superheat is in this in default degree of superheat threshold range
Between the upper limit value and lower limit value of default degree of superheat threshold range, then exported between the upper limit value and lower limit value if not being in
First exceeds signal；First is exported without departing from signal if being between the upper limit value and lower limit value.
Second judgment module 30 is used for according to this first beyond the signal judgement spray enthalpy refrigerant degree of superheat and default degree of superheat threshold
It is worth the relationship of range.
I.e. when the spray enthalpy refrigerant degree of superheat is not within the scope of the preheated heat degree threshold, further enthalpy refrigerant is sprayed in judgement
The upper limit value that the degree of superheat is greater than the default degree of superheat threshold range is also less than the lower limit value of the default degree of superheat threshold range,
The first increase signal is then exported if it is the former, and the first reduction signal is then exported if it is the latter.
Control module 40 then increases default first for increasing the aperture of signal control spray enthalpy electric expansion valve according to first
Aperture stride, i.e., when the enthalpy refrigerant degree of superheat is greater than the upper limit value of the default degree of superheat threshold range, control spray enthalpy electronic expansion
The aperture of valve increases default first aperture stride in the first preset duration；It is also used to reduce signal control spray enthalpy electricity according to first
The aperture of sub- expansion valve reduces default second aperture stride, when the enthalpy refrigerant degree of superheat is less than under the default degree of superheat threshold range
When limit value, the aperture of control spray enthalpy electric expansion valve reduces default second aperture stride in the second preset duration.
It can be seen from the above technical proposal that present embodiments providing a kind of compressor air-discharging of low-temp. spraying enthalpy heat-flash unit
Temperature control system, the system include degree of superheat computing module, first judgment module, the second judgment module and control module.It crosses
Temperature computing module is used to obtain the spray enthalpy refrigerant degree of superheat of the unit, first judgment module then by the spray enthalpy refrigerant degree of superheat with
Default degree of superheat threshold range is compared, and third judgment module is then used to determine the spray enthalpy refrigerant degree of superheat in first judgment module
When beyond default degree of superheat threshold range, the spray enthalpy refrigerant degree of superheat and the relationship of default degree of superheat threshold range are judged,
Control module is used for the control spray enthalpy electronic expansion when spraying the enthalpy refrigerant degree of superheat and exceeding the upper limit value of default degree of superheat threshold range
The aperture of valve increases default first aperture stride, or is lower than the lower limit of default degree of superheat threshold range in the spray enthalpy refrigerant degree of superheat
The aperture that the spray enthalpy electric expansion valve is controlled when value reduces default second aperture stride.Spray enthalpy can be effectively controlled by controlling above
The refrigerant degree of superheat is in default degree of superheat threshold range.From the spray enthalpy refrigerant degree of superheat and compressor known to content mentioned above
Delivery temperature is directly related, thus, it can be known that this system can effectively control the compressor exhaust temperature of low-temp. spraying enthalpy heat-flash unit
Stationarity, so as to effectively be avoided using this method because compressor exhaust temperature is beyond pacifying caused by safe fluctuation range
Full hidden danger.
In addition, the degree of superheat computing module 10 includes pressure sensing cell, temperature detecting unit, arithmetic element and subtraction list
Member.
Pressure sensing cell is used to obtain the hydrojet pressure of the refrigerant mouth spray of scroll compression pocket；Temperature detecting unit is used
In the actual temperature for obtaining refrigerant mouth spray；Arithmetic element is used to calculate the corresponding theoretical temperature of hydrojet pressure according to thermodynamics theorem
Degree；Subtrator is then used to subtract actual temperature theoretical temperatures and finally obtains the spray enthalpy refrigerant degree of superheat.
Example IV
Fig. 4 is the compressor exhaust temperature control system for the low-temp. spraying enthalpy heat-flash unit that the another embodiment of the application provides
Schematic diagram.
As shown in figure 4, being in obtain to the better control effect of compressor exhaust temperature in the spray enthalpy refrigerant degree of superheat
When in default degree of superheat threshold range, corresponding measure is also further judged its situation of change and is taken, specially upper
Third judgment module, the 4th judgment module and the 5th judgment module are additionally arranged on the basis of one embodiment.
Third judgment module 50 is used to determine that the spray enthalpy refrigerant degree of superheat is in default degree of superheat model when first judgment module 20
When enclosing, further the judgement spray enthalpy refrigerant degree of superheat is to increase or reducing, defeated if increasing if the spray enthalpy refrigerant degree of superheat
Increase process signal out, exports reduction process signal if in reduction.
4th judgment module 60 is used to judge according to the increase process signal that the increase change rate of the spray enthalpy refrigerant degree of superheat to be
It is no to be greater than default increase change rate, i.e., when the spray enthalpy refrigerant degree of superheat further judges that it increases change rate and is in the case where increase
It is no to be greater than default increase change rate, it if it is exports second and increases signal, otherwise export normal opening amount signal.
5th judgment module 70 is used to judge whether the reduction change rate for spraying the enthalpy refrigerant degree of superheat to be greater than default reduce and change
Rate, i.e., when the spray enthalpy refrigerant degree of superheat further judges that it reduces whether change rate is greater than default reduction variation in the case where reduction
Rate if it is exports second and reduces signal, otherwise exports normal opening amount signal.
Above-mentioned control module 40 is also used to increase the aperture of signal control spray enthalpy electric expansion valve in third according to second
Increase default third aperture stride in preset duration, or reduces the aperture of signal control spray enthalpy electric expansion valve the according to second
Reduce default 4th aperture stride in four preset durations.
Keep current aperture constant in addition, control module 40 is also used to control aperture according to normal opening amount signal.Increasing
Big change rate, which is greater than to preset increase change rate or reduce when change rate is less than default reduction change rate, controls spray enthalpy electronic expansion
The aperture of valve remains unchanged.
Each embodiment in this specification is described in a progressive manner, the highlights of each of the examples are with other
The difference of embodiment, the same or similar parts in each embodiment may refer to each other.To the upper of the disclosed embodiments
It states bright, can be realized professional and technical personnel in the field or using the application.Various modifications to these embodiments are to ability
It will be apparent for the professional technician in domain, the general principles defined herein can not depart from the application's
In the case where spirit or scope, realize in other embodiments.Therefore, the application be not intended to be limited to it is shown in this article these
Embodiment, and it is to fit to the widest scope consistent with the principles and novel features disclosed herein.
Claims (8)
1. a kind of compressor exhaust temperature control method of low-temp. spraying enthalpy heat-flash unit is applied to the low-temp. spraying enthalpy heat-flash unit
Controller, which is characterized in that including step：
Obtain the spray enthalpy refrigerant degree of superheat of the low-temp. spraying enthalpy heat-flash unit；
Judge whether the spray enthalpy refrigerant degree of superheat is in default degree of superheat threshold range；
If the spray enthalpy refrigerant degree of superheat exceeds the default degree of superheat threshold range, then the spray enthalpy refrigerant mistake is further judged
The relationship of temperature and the default degree of superheat threshold range；
If the spray enthalpy refrigerant degree of superheat is greater than the upper limit value of the default degree of superheat threshold range, then in the first preset duration
The aperture for spraying enthalpy electric expansion valve is increased into default first aperture stride；
If the spray enthalpy refrigerant degree of superheat is less than the lower limit value of the default degree of superheat threshold range, then in the second preset duration
The aperture of the spray enthalpy electric expansion valve is reduced into default second aperture stride.
2. compressor exhaust temperature control method as described in claim 1, which is characterized in that described to obtain the low-temp. spraying enthalpy
The spray enthalpy refrigerant degree of superheat of heat-flash unit, including：
Obtain the hydrojet pressure and actual temperature of the refrigerant mouth spray of scroll compression pocket；
The corresponding theoretical temperatures of the hydrojet pressure are calculated according to thermodynamics theorem；
The actual temperature is subtracted into the theoretical temperatures, obtains the spray enthalpy refrigerant degree of superheat.
3. compressor exhaust temperature control method as claimed in claim 1 or 2, which is characterized in that further include step：
If the spray enthalpy refrigerant degree of superheat is in the default degree of superheat threshold range, then the spray enthalpy refrigerant mistake is further judged
Temperature is to increase or reducing；
When the spray enthalpy refrigerant degree of superheat increases, it is default to judge whether the increase change rate of the spray enthalpy refrigerant degree of superheat is greater than
Increase change rate；
If the increase change rate is greater than the default increase change rate, then by the aperture of the spray enthalpy electric expansion valve in third
Increase default third aperture stride in preset duration；
When the spray enthalpy refrigerant degree of superheat reduces, it is default to judge whether the reduction change rate of the spray enthalpy refrigerant degree of superheat is greater than
Reduce change rate；
If the reduction change rate is greater than the default reduction change rate, then by the aperture of the spray enthalpy electric expansion valve the 4th
Reduce default 4th aperture stride in preset duration.
4. compressor exhaust temperature control method as claimed in claim 3, which is characterized in that further include step：
Become as the increase change rate is less than the default increase change rate or the reduction change rate less than the default reduction
Rate then keeps the aperture of the spray enthalpy electric expansion valve constant.
5. a kind of compressor exhaust temperature control system of low-temp. spraying enthalpy heat-flash unit is applied to the low-temp. spraying enthalpy heat-flash unit
Controller, which is characterized in that including：
Degree of superheat computing module, for obtaining the spray enthalpy refrigerant degree of superheat of the low-temp. spraying enthalpy heat-flash unit；
First judgment module, for judging whether the spray enthalpy refrigerant degree of superheat is in default degree of superheat threshold range；
Second judgment module, for determining that the spray enthalpy refrigerant degree of superheat exceeds the default overheat when the first judgment module
When spending threshold range, the relationship of spray the enthalpy refrigerant degree of superheat and the default degree of superheat threshold range is further judged；
Control module, for determining that the spray enthalpy refrigerant degree of superheat is greater than the default degree of superheat threshold value model when the second judgment module
When the upper limit value enclosed, the aperture of control spray enthalpy electric expansion valve increases default first aperture stride in the first preset duration；Or
For controlling the spray enthalpy electronics when the spray enthalpy refrigerant degree of superheat is less than the lower limit value of the default degree of superheat threshold range
The aperture of expansion valve reduces default second aperture stride in the second preset duration.
6. compressor exhaust temperature control system as claimed in claim 5, which is characterized in that the degree of superheat computing module packet
It includes：
Pressure sensing cell, the hydrojet pressure of the refrigerant mouth spray for obtaining scroll compression pocket；
Temperature detecting unit, for obtaining the actual temperature of the refrigerant mouth spray；
Arithmetic element, for calculating the corresponding theoretical temperatures of the hydrojet pressure according to thermodynamics theorem；
Subtrator obtains the spray enthalpy refrigerant degree of superheat for the actual temperature to be subtracted the theoretical temperatures.
7. such as compressor exhaust temperature control system described in claim 5 or 6, which is characterized in that further include：
Third judgment module, for determining that the spray enthalpy refrigerant degree of superheat is in the default overheat when the first judgment module
When spending threshold range, further judge that the spray enthalpy refrigerant degree of superheat is to increase or reducing；
4th judgment module, for further sentencing when the third judgment module determines that the spray enthalpy refrigerant degree of superheat increases
Whether the increase change rate for the spray enthalpy refrigerant degree of superheat of breaking is greater than default increase change rate；
The control module is also used to determine that the increase change rate is greater than the default increase and becomes when the 4th judgment module
When rate, the aperture for controlling the spray enthalpy electric expansion valve increases default third aperture stride in third preset duration；
5th judgment module, for further sentencing when the third judgment module determines that the spray enthalpy refrigerant degree of superheat reduces
Whether the reduction change rate for the spray enthalpy refrigerant degree of superheat of breaking is greater than default reduction change rate；
The control module is also used to determine that the reduction change rate is greater than the default reduction and becomes when the 5th judgment module
When rate, the aperture for controlling the spray enthalpy electric expansion valve reduces default 4th aperture stride in the 4th preset duration.
8. compressor exhaust temperature control system as claimed in claim 7, which is characterized in that
The control module is also used to determine that the increase change rate is less than the default increase and becomes when the 4th judgment module
Rate, or when the 5th judgment module determines that the reduction change rate is less than the default reduction change rate, control the spray
The aperture of enthalpy electric expansion valve remains unchanged.
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| 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 |
| 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 |
| 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 |
| 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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