CN113154730A - Refrigerant charge amount calculation method and device and refrigeration equipment - Google Patents

Refrigerant charge amount calculation method and device and refrigeration equipment Download PDF

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Publication number
CN113154730A
CN113154730A CN202110485382.1A CN202110485382A CN113154730A CN 113154730 A CN113154730 A CN 113154730A CN 202110485382 A CN202110485382 A CN 202110485382A CN 113154730 A CN113154730 A CN 113154730A
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Prior art keywords
value
flow
inspiration
temperature
closest
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钟子豪
黄金献
张伟彬
曹勇
何国军
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Gree Electric Appliances Inc of Zhuhai
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Gree Electric Appliances Inc of Zhuhai
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B45/00—Arrangements for charging or discharging refrigerant
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B49/00—Arrangement or mounting of control or safety devices
    • F25B49/02—Arrangement or mounting of control or safety devices for compression type machines, plants or systems

Abstract

The invention discloses a method and a device for calculating the refrigerant charge amount and refrigeration equipment. Wherein, the method comprises the following steps: acquiring a suction pressure value and a suction temperature value of the compressor; inquiring a flow value corresponding to the inspiration pressure value and the inspiration temperature value based on a flow value table; the flow value table is used for representing the corresponding relation among the inspiration pressure value, the inspiration temperature value and the flow value; and calculating the refrigerant charge according to the flow value. The invention can solve the problem that the calculation value of the refrigerant charge amount is inaccurate due to a certain error between the flow value obtained by calculating the suction temperature and the suction pressure value and the flow value under the actual condition, and improves the calculation accuracy of the refrigerant charge amount.

Description

Refrigerant charge amount calculation method and device and refrigeration equipment
Technical Field
The invention relates to the technical field of refrigeration, in particular to a method and a device for calculating the refrigerant charge amount and refrigeration equipment.
Background
The refrigerant is the working medium of the refrigeration equipment, and is the 'blood' of the refrigeration equipment. If the refrigerant in the air conditioner is insufficient, the working performance of the air conditioner can be directly influenced, and even the compressor in the refrigeration equipment can be damaged, so that great property loss is caused to users, and the timely filling of the refrigerant is very important. In the field refrigeration equipment, the refrigerant charging amount is generally estimated by the experience of installation and maintenance personnel, which leads to inaccurate charging amount of the refrigerant, and is easy to cause poor reliability and user experience of the refrigeration equipment, thereby highlighting the importance of accurately knowing the actual charging amount of the refrigerant required by the refrigeration equipment.
In the prior art, a scheme of calculating the percentage of the refrigerant residual quantity through the ratio between the actual mass flow and the standard mass flow is disclosed, but because the actual mass flow is calculated according to the suction temperature value and the suction pressure value of the compressor, a certain error is generated between the actual mass flow and the flow value, and the calculated value of the refrigerant charge quantity is inaccurate.
Aiming at the problem that the calculated value of the refrigerant charge amount is inaccurate due to a certain error between the actual flow obtained by calculation and the flow value under the actual condition in the prior art, no effective solution is provided at present.
Disclosure of Invention
The embodiment of the invention provides a method and a device for calculating refrigerant charge and refrigeration equipment, and aims to solve the problem that a calculated value of the refrigerant charge is inaccurate due to a certain error between an actual flow obtained by calculation and a flow value under an actual condition in the prior art.
In order to solve the technical problem, the invention provides a method for calculating the refrigerant charge amount, which comprises the following steps:
acquiring a suction pressure value and a suction temperature value of the compressor;
inquiring a flow value corresponding to the inspiration pressure value and the inspiration temperature value based on a flow value table; the flow value table is used for representing the corresponding relation among the inspiration pressure value, the inspiration temperature value and the flow value;
and calculating the refrigerant charge according to the flow value.
Further, inquiring a flow value corresponding to the inspiration pressure value and the inspiration temperature value based on a flow value table comprises:
judging whether a numerical value which is completely consistent with the inspiration pressure value and the inspiration temperature value can be inquired in the flow value table;
if yes, directly determining flow values corresponding to the inspiration pressure value and the inspiration temperature value;
and if not, determining the flow value based on the flow value table in an interpolation calculation mode.
Further, determining the flow rate value based on the flow rate value table by means of interpolation calculation includes:
if only a value which is completely consistent with one of the two parameters of the suction pressure value and the suction temperature value can be inquired in the flow value table, the following operations are carried out:
determining a first value and a second value which are closest to the parameter which can not be inquired in the flow value table;
determining a proportional relationship between the first value and the second value and the parameter that cannot be queried;
and determining the flow value according to the parameters which can be inquired in the flow value table, the parameters which cannot be inquired, the first value, the second value and the proportional relation.
Further, if the parameter that can be queried is an inspiratory pressure value, determining the flow value according to the parameter that can be queried in the flow value table, the parameter that cannot be queried, the first value, the second value, and the proportional relationship according to the formula:
Figure BDA0003050051540000021
wherein T is the inspiration temperature value, TNIs the most connected with the inspiration temperature value in the flow value tableNear first value, TN+1Is the second value closest to the inspiration temperature value in the flow value table, P is the inspiration pressure value, Q (T)NP) is the flow value corresponding to the first value closest to the value of the suction temperature and the value of the suction pressure, Q (T)N+1P) is a flow value corresponding to a second value closest to the inspiration temperature value and the inspiration pressure value, Q (T, P) is a flow value to be determined, and N is a serial number of a first value closest to the inspiration temperature value in the flow value table.
Further, if the parameter that can be queried is an inspiration temperature value, determining the flow value according to the parameter that can be queried in the flow value table, the parameter that cannot be queried, the first value, the second value, and the proportional relationship according to the formula:
Figure BDA0003050051540000031
wherein P is the suction pressure value, PNIs the first value, P, in the flow value table closest to the suction pressure valueN+1Is the second value closest to the suction pressure value in the flow value table, T is the suction temperature value, Q (T, P)N) Is the flow value corresponding to the first value closest to the suction pressure value and the suction temperature value, Q (T, P)N+1) And Q (T, P) is a flow value to be determined, and N is a serial number of a first value which is closest to the suction pressure value in the flow value table.
Further, determining the flow rate value based on the flow rate value table by means of interpolation calculation further includes:
if a value that is completely consistent with the suction pressure value cannot be inquired in the flow value table, and a value that is completely consistent with the suction temperature value cannot be inquired, performing the following operations:
determining a first value and a second value which are closest to one of the parameters which cannot be queried and a third value and a fourth value which are closest to the other parameter which cannot be queried in the flow value table;
determining a first proportional relationship of the first and second values to one of the non-queryable parameters and a second proportional relationship of the third and fourth values to the other of the non-queryable parameters;
determining the flow value according to one of the parameters that cannot be queried, the first value, the second value, the third value, the fourth value, the first proportional relationship, and the second proportional relationship.
Further, determining the flow value according to one of the parameters that cannot be queried, the first value, the second value, the third value, the fourth value, the first proportional relationship, and the second proportional relationship includes:
determining a first flow value corresponding to one of the parameters which cannot be queried and the third value according to the one of the parameters which cannot be queried, the first value, the second value, the third value and the first proportional relation;
determining a second flow value corresponding to one of the parameters which cannot be queried and the third value according to the first value, the second value, the fourth value and the first proportional relation;
and determining the flow value according to the first flow value, the second flow value and the second proportional relation.
Further, when the refrigerant charge amount is calculated according to the flow value, the formula according to which:
Figure BDA0003050051540000041
M＝M0-M1；
wherein Q is1Is the flow rate value, Q0Is a standard flow value, M1For the remainder of the refrigerant, M0M is the refrigerant charge for the standard refrigerant amount.
The present invention also provides a refrigerant charge amount calculation device, including:
the first acquisition module is used for acquiring a suction pressure value and a suction temperature value of the compressor;
the second acquisition module is used for inquiring flow values corresponding to the inspiration pressure value and the inspiration temperature value based on a flow value table; the flow value table is used for representing the corresponding relation among the inspiration pressure value, the inspiration temperature value and the flow value;
and the calculating module is used for calculating the refrigerant charging quantity according to the flow value.
The invention also provides a refrigerating device which comprises an indoor unit, an outdoor unit, a compressor and the refrigerant charge amount calculating device.
The present invention also provides a computer-readable storage medium having stored thereon a computer program which, when executed by a processor, implements the above-described refrigerant charge amount calculation method.
By applying the technical scheme of the invention, the flow value table is inquired according to the suction pressure value and the suction temperature value of the compressor to obtain the flow value, the problem that the calculation value of the refrigerant charge amount is inaccurate due to the fact that the actual flow obtained by calculating the suction pressure value and the suction pressure value has a certain error with the flow value under the actual condition can be solved, and the calculation accuracy of the refrigerant charge amount is improved.
Drawings
FIG. 1 is a flow chart of a refrigerant charge calculation method according to an embodiment of the present invention;
FIG. 2 is a flowchart of step S102 according to an embodiment of the present invention;
fig. 3 is a flowchart of a refrigerant charge calculation method according to another embodiment of the present invention;
fig. 4 is a block diagram of a refrigerant charge amount calculation device according to an embodiment of the present invention;
fig. 5 is a block diagram of a refrigerant charge amount calculation device according to another embodiment of the present invention;
fig. 6 is a structural view of a refrigerating apparatus according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention clearer, the present invention will be described in further detail with reference to the accompanying drawings, and it is apparent that the described embodiments are only a part of the embodiments of the present invention, not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The terminology used in the embodiments of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used in the examples of the present invention and the appended claims, the singular forms "a", "an", and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise, and "a plurality" typically includes at least two.
It should be understood that the term "and/or" as used herein is merely one type of association that describes an associated object, meaning that three relationships may exist, e.g., a and/or B may mean: a exists alone, A and B exist simultaneously, and B exists alone. In addition, the character "/" herein generally indicates that the former and latter related objects are in an "or" relationship.
It should be understood that although the terms first, second, etc. may be used in describing the inhalation temperature values in embodiments of the present invention, these inhalation temperature values should not be limited to these terms. These terms are only used to distinguish between values of different inhalation temperature values. For example, without departing from the scope of embodiments of the present invention, the first value closest to the inhalation temperature value may also be referred to as the second value closest to the inhalation temperature value in the flow rate value table, and similarly, the second value closest to the inhalation temperature value may also be referred to as the first value closest to the inhalation temperature value in the flow rate value table.
The words "if", as used herein, may be interpreted as "at … …" or "at … …" or "in response to a determination" or "in response to a detection", depending on the context. Similarly, the phrases "if determined" or "if detected (a stated condition or event)" may be interpreted as "when determined" or "in response to a determination" or "when detected (a stated condition or event)" or "in response to a detection (a stated condition or event)", depending on the context.
It is also noted that the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that an article or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such article or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other like elements in the article or device in which the element is included.
Alternative embodiments of the present invention are described in detail below with reference to the accompanying drawings.
Example 1
The present embodiment provides a refrigerant charge amount calculating method, which can be applied to refrigeration equipment such as an air conditioner and a refrigerator, and fig. 1 is a flowchart of the refrigerant charge amount calculating method according to the embodiment of the present invention, as shown in fig. 1, the method includes:
s101, acquiring a suction pressure value and a suction temperature value of the compressor.
After the refrigeration equipment is started normally, the air suction temperature value and the air suction pressure value of the compressor are respectively obtained through a temperature value sensor and a pressure value sensor which are close to an air suction port of the compressor.
S102, inquiring flow values corresponding to the acquired inspiration pressure value and inspiration temperature value based on a flow value table; the flow value table is used for representing the corresponding relation among the inspiration pressure value, the inspiration temperature value and the flow value.
In the prior art, the specific volume of the compressor is generally found out according to the temperature and pressure values of the compressor, the displacement of the compressor is found out according to a design manual, the frequency of the compressor is collected, and the flow value of the refrigerant in the refrigeration equipment, namely the displacement of the compressor is calculatedThe ratio of the compressor frequency to the compressor suction specific volume. However, the flow rate value of the refrigerant obtained by the above method has a certain error from the actual flow rate value of the refrigerant, which causes an error in the final refrigerant charge amount. In order to avoid the error of the refrigerant flow rate value, in the embodiment, the suction temperature value T is set1、T2、T3…TmAs a row, the suction pressure value P1、P2、P3…PnAnd as a row, obtaining a flow value table according to the flow values corresponding to the same inspiration temperature value and different inspiration pressure values and the flow values corresponding to the same inspiration pressure value and different inspiration temperature values, wherein Q (T, P) is a flow value determined by a row where the inspiration temperature value T is located and a column where the inspiration pressure value P is located.
In the concrete implementation, a flowmeter can be arranged at the inlet of the indoor unit of the refrigeration equipment, the flowmeter is used for measuring the flow values of the refrigerant under different suction temperature values and suction pressure values to form a flow value table, the flow value table is stored in the refrigeration equipment, then the flowmeter can be omitted from the actual refrigeration equipment, and the flow value table is directly inquired through the suction temperature value and the suction pressure value of the compressor to obtain the flow value of the refrigerant in the refrigeration equipment. The transverse rows of the flow value meter are respectively the suction pressure value P of the compressor1、P2、P3…PnAnd a value of inspiration temperature T1、T2、T3…TmTaking the suction pressure value as the row and the suction temperature value of the compressor, P1……PnAnd T1……TmThe smaller the spacing therebetween, the more accurate the actual mass value of the refrigerant is obtained. In this embodiment, the actual mass value is a mass flow value.
And S103, calculating the refrigerant charging quantity according to the flow value.
In specific implementation, according to an operation mode of the refrigeration equipment, an indoor temperature value and an outdoor temperature value are combined, and a theoretical standard flow rate of a refrigerant in the refrigeration equipment is calculated, wherein the indoor temperature value can be obtained through a temperature sensing bulb arranged on an indoor unit, and the outdoor temperature value can be obtained through a temperature sensing bulb arranged on an outdoor unit.
For example, if the refrigeration equipment is in a refrigeration mode, acquiring the standard flow of a refrigerant of the refrigeration equipment according to a preset refrigeration matrix table, an indoor temperature value and an outdoor temperature value; and if the air conditioner is in the heating mode, acquiring the standard flow of the refrigerant of the refrigeration equipment according to a preset heating matrix table, the indoor temperature value and the outdoor temperature value. Then, a refrigerant surplus is determined based on the ratio of the flow rate value obtained in the above step S102 to the standard flow rate value, and the refrigerant charge amount is determined.
According to the refrigerant charge calculation method, the flow value table is inquired according to the suction pressure value and the suction temperature value of the compressor to obtain the flow value, the problem that the refrigerant charge calculation value is inaccurate due to the fact that the actual flow obtained through calculation of the suction pressure value and the suction pressure value has a certain error with the flow value in an actual situation can be solved, and the refrigerant charge calculation accuracy is improved.
Example 2
In this embodiment, another refrigerant charge amount calculation method is provided, and fig. 2 is a flowchart of step S102 according to an embodiment of the present invention, since it is considered that the changes of the suction pressure value P and the suction temperature value T are continuous, it is difficult to include all the suction temperature values and the suction pressure values in the flow rate value table, and therefore, the flow rate value query under all the operating conditions cannot be completed, and the suction temperature value T cannot be queried in the flow rate value tableiAnd/or the suction pressure value PjIn this case, the actual mass flow value of the refrigerant may be obtained by interpolation, and therefore, as shown in fig. 2, the step S102 specifically includes:
s102-1, judging whether a numerical value which is completely consistent with the acquired air suction pressure value and air suction temperature value can be inquired in the flow value table; s102-2, if yes, directly determining a flow value corresponding to the acquired inspiration pressure value and inspiration temperature value; and S102-3, if not, determining the flow value based on the flow value table by means of interpolation calculation.
By the interpolation method, when the inspiration temperature value and/or the inspiration pressure value cannot be inquired in the flow value table, the flow values corresponding to the inspiration temperature value and the inspiration pressure value are calculated through the inspiration temperature value and the inspiration pressure value existing in the flow value table and the flow values corresponding to the inspiration temperature value and the inspiration pressure value, so that the method can be suitable for actual flow calculation under various working conditions.
In a specific implementation, in order to estimate an unknown intake pressure value and/or an unknown flow value corresponding to an intake temperature value by an interpolation method according to known intake pressure values and flow values corresponding to intake temperature values in the flow value table, the step S102-3 specifically includes: if only a value which is completely consistent with one of the two parameters of the acquired suction pressure value and the acquired suction temperature value can be inquired in the flow value table, the following operations are carried out: determining a first value and a second value which are closest to the parameter which can not be inquired in a flow value table; determining the proportional relation between the first value and the second value and the parameter which cannot be inquired; and determining the flow values corresponding to the acquired inspiration pressure value and the acquired inspiration temperature value according to the parameters which can be inquired in the flow value table, the parameters which can not be inquired, the first value, the second value and the proportional relation.
For example, if the above flow rate value table can be searched for an intake pressure value and cannot be searched for an intake temperature value, the following operations are triggered: determining a first value closest to the acquired inspiration temperature value and a second value closest to the acquired inspiration temperature value in a flow value table according to the inspiration temperature value; determining a proportional relation between a first value closest to the acquired inspiration temperature value in the flow meter and a second value closest to the acquired inspiration temperature value in the flow meter and the acquired inspiration temperature value; and calculating the acquired suction pressure value and the flow value at the acquired suction temperature value according to the acquired suction temperature value, a first value which is closest to the acquired suction temperature value in the flow meter, a second value which is closest to the acquired suction temperature value in the flow meter, the proportional relation and the acquired suction pressure value.
When the acquired inspiration pressure value and the flow value under the acquired inspiration temperature value are calculated according to the acquired inspiration temperature value, a first value which is closest to the acquired inspiration temperature value in the flow meter, a second value which is closest to the acquired inspiration temperature value in the flow meter, the proportional relation and the acquired inspiration pressure value, the formula is as follows:
Figure BDA0003050051540000091
wherein T is the value of the inspiration temperature, TNIs the first value, T, in the flow value table closest to the acquired inspiratory temperature valueN+1Is the second value closest to the acquired inspiration temperature value in the flow value table, P is the inspiration pressure value, Q (T)NP) is the flow value corresponding to the first value closest to the value of the intake air temperature obtained and the value of the intake air pressure, Q (T)N+1P) is a flow value corresponding to the second value closest to the acquired intake temperature value and the intake pressure value, Q (T, P) is a flow value to be determined, and N is a serial number of the first value closest to the acquired intake temperature value in the flow value table.
It should be noted that, if a value greater than the acquired intake air temperature value or a value less than the acquired intake air temperature value can be found in the flow rate value table, it may be determined that the first value closest to the acquired intake air temperature value is the value closest to the acquired intake air temperature value among all the values less than the acquired intake air temperature value, and the second value closest to the acquired intake air temperature value is the value closest to the acquired intake air temperature value among all the values greater than the acquired intake air temperature value. That is, the first value closest to the acquired inhalation temperature value and the second value closest to the acquired inhalation temperature value are two values that are one larger and one smaller around the acquired inhalation temperature value.
If the flow value table can not be inquired, the value larger than the acquired inspiration temperature value is obtained, namely the acquired inspiration temperature value exceeds the maximum temperature value T in the flow value tablemDetermining the first value closest to the acquired inspiration temperature value and the second value closest to the acquired inspiration temperature value as two values, namely T, the two values closest to the inspiration temperature value in the flow value tablemAnd Tm-1Both values are less than acquiredThe value of the inspiration temperature.
If the flow value table is not searched, the value smaller than the acquired inspiration temperature value can not be searched, namely the acquired inspiration temperature value is smaller than the minimum temperature value T in the flow value table1Then, the first value closest to the acquired inhalation temperature value and the second value closest to the acquired inhalation temperature value are determined as two values, i.e. T, closest to the acquired inhalation temperature value in the flow rate value table1And T2Both values are greater than the acquired inspiration temperature value.
For another example, if the flow value table can be queried about the inspiration temperature value and cannot be queried about the inspiration pressure value, the following operations are triggered: determining a first value closest to the suction pressure value and a second value closest to the obtained suction pressure value in a flow value table according to the obtained suction pressure value; determining a proportional relation between a first value closest to the acquired suction pressure value in the flow value table and a second value closest to the acquired suction pressure value in the flow value table and the acquired suction pressure value; and calculating the acquired suction pressure value and the flow value under the acquired suction temperature value according to the acquired suction temperature value, a first value which is closest to the acquired suction pressure value in the flow value table, a second value which is closest to the acquired suction pressure value in the flow value table, the proportional relation and the acquired suction pressure value.
When the acquired suction pressure value and the flow value under the acquired suction temperature value are calculated according to the acquired suction temperature value, a first value which is closest to the acquired suction pressure value in the flow value table, a second value which is closest to the acquired suction pressure value in the flow value table, the proportional relation and the acquired suction pressure value, the formula is as follows:
Figure BDA0003050051540000101
wherein P is the value of the suction pressure, PNIs the first value, P, in the flow value table closest to the acquired suction pressure valueN+1Is the second value closest to the acquired suction pressure value in the flow value tableT is the value of the inspiration temperature, Q (T, P)N) Is the flow value corresponding to the first value closest to the acquired suction pressure value and the suction temperature value, Q (T, P)N+1) Q (T, P) is a flow value required to be determined, and N is a serial number of a first value which is closest to the acquired air suction temperature value in a flow value table.
It should be noted that, if a value greater than the acquired suction pressure value and a value less than the acquired suction pressure value can be found in the flow rate value table, it may be determined that the first value closest to the acquired suction pressure value is the value closest to the acquired suction pressure value among all the values less than the acquired suction pressure value, and the second value closest to the acquired suction pressure value is the value closest to the acquired suction pressure value among all the values greater than the acquired suction pressure value in the flow rate value table. That is, the first value closest to the acquired suction pressure value and the second value closest to the acquired suction pressure value are two values that are one larger and one smaller in the vicinity of the acquired suction pressure value.
If the flow value table can not be inquired, the value larger than the acquired suction pressure value can not be inquired, namely the acquired suction pressure value exceeds the maximum suction pressure value P in the flow value tablenDetermining the first value closest to the acquired suction pressure value and the second value closest to the acquired suction pressure value as P which are two values closest to the acquired suction pressure value in the flow value tablenAnd Pn-1Both values are smaller than the acquired value of the suction pressure.
If the flow value table is not searched, the value smaller than the acquired suction pressure value can not be searched, namely the acquired suction pressure value is smaller than the minimum pressure value P in the flow value table1Determining the first value closest to the acquired suction pressure value and the second value closest to the acquired suction pressure value as two values, namely P, closest to the acquired suction pressure value in the flow value table1And P2Both values are greater than the inspiratory pressure value.
In practical application, there is also a case that a value completely consistent with the acquired suction pressure value cannot be inquired in the flow rate value table, and a value completely consistent with the acquired suction temperature value cannot be inquired in the flow rate value table, and at this time, the following operations are performed: determining a first value and a second value which are closest to one of the parameters which can not be inquired, and a third value and a fourth value which are closest to the other parameter which can not be inquired in a flow value table; determining a first proportional relationship between the first value and the second value and one of the parameters which cannot be queried, and a second proportional relationship between the third value and the fourth value and the other parameter which cannot be queried; and determining a flow value corresponding to the acquired inspiration pressure value and the acquired inspiration temperature value according to the first value, the second value, the third value, the fourth value, the first proportional relation and the second proportional relation, wherein the parameters cannot be inquired.
Specifically, the method comprises the following steps: determining a first flow value corresponding to one of the parameters which cannot be inquired and a third value according to the one of the parameters which cannot be inquired, the first value, the second value, the third value and the first proportional relation; determining a second flow value corresponding to one of the parameters which cannot be queried and the third value according to the first value, the second value, the fourth value and the first proportional relation; and determining the flow values corresponding to the acquired inspiration pressure value and the acquired inspiration temperature value according to the first flow value, the second flow value, the third value, the fourth value and the second proportional relation.
For example, if the acquired suction pressure value and the acquired suction temperature value cannot be inquired in the flow value table, determining a first value closest to the suction temperature value and a second value closest to the suction temperature value in the flow value table according to the acquired suction temperature value; determining a first value closest to the suction pressure value and a second value closest to the suction pressure value in a flow value table according to the acquired suction pressure value; a first proportional relationship is determined between the acquired inspiratory temperature value, a first value in the flow value table that is closest to the acquired inspiratory temperature value, and a second proportional relationship is determined between the acquired inspiratory pressure, the first value in the flow value table that is closest to the acquired inspiratory pressure value, and the second value in the flow value table that is closest to the acquired inspiratory pressure value.
The first value in the first proportional relationship and flow value table closest to the acquired suction pressure value may be used to determine the first flow value in the first value in the acquired suction temperature value and flow value table closest to the acquired suction pressure value, the second value in the first proportional relationship and flow value table closest to the acquired suction pressure value may be used to determine the second flow value in the second value in the acquired suction temperature value and flow value table closest to the acquired suction pressure value, and the acquired suction pressure value and the flow value in the acquired suction temperature value may be calculated according to the first flow value, the second flow value, and the second proportional relationship.
It should be noted that, in this embodiment, a formula according to which the first value closest to the acquired suction pressure value in the flow value table is used to determine the acquired suction temperature value and the first flow value in the flow value table under the first value closest to the acquired suction pressure value is based on the first proportional relationship and the formula, which is similar to the formula in the above embodiment in which the suction pressure value can be looked up in the flow value table and the suction temperature value cannot be looked up, and it is only necessary to replace the suction pressure value in (1) in the above formula with the first value in the flow value table closest to the acquired suction pressure value.
Similarly, the formula according to which the acquired suction temperature value and the second flow value in the flow value table at the second value closest to the acquired suction pressure value are determined according to the first proportional relationship and the second value in the flow value table closest to the acquired suction pressure value may be similar to the formula in the above embodiment in which the suction pressure value can be looked up in the flow value table and the suction temperature value cannot be looked up, and it is sufficient to replace the suction pressure value in (1) in the above formula with the second value in the flow value table closest to the acquired suction pressure value.
When the acquired inspiration pressure value and the acquired flow value under the inspiration temperature value are calculated according to the first flow value, the second flow value and the second proportional relation, the formula according to which the inspiration temperature value can be inquired in the flow value table and the formula under the condition that the inspiration pressure value cannot be inquired is the same as that in the embodiment.
In another embodiment of the present invention, the third flow value in the first value closest to the acquired inhalation temperature value in the flow value table and the acquired inhalation pressure value may be determined according to the second proportional relationship and the first value closest to the acquired inhalation temperature value in the flow value table, the fourth flow value in the second value closest to the acquired inhalation temperature value in the flow value table and the acquired inhalation pressure value may be determined according to the second value closest to the acquired inhalation temperature value in the second proportional relationship and the flow value table, and the flow value corresponding to the acquired inhalation pressure value and the acquired inhalation temperature value may be determined according to the third flow value, the fourth flow value and the first proportional relationship.
It should be noted that, in this embodiment, a formula according to which the acquired suction pressure value and the third flow value in the flow value table under the first value closest to the acquired suction temperature value are determined according to the second proportional relationship and the first value in the flow value table closest to the acquired suction temperature value is similar to the formula in the above embodiment in which the suction temperature value can be found in the flow value table but the suction pressure value cannot be found, and it is only necessary to replace the suction temperature value in (2) in the above formula with the first value in the flow value table closest to the acquired suction temperature value.
Similarly, a formula according to which the acquired suction pressure value and the fourth flow value in the flow value table at the second value closest to the acquired suction temperature value are determined according to the second proportional relation and the second value in the flow value table closest to the acquired suction temperature value is similar to the formula in the above embodiment where the suction temperature value can be found in the flow value table and the suction pressure value cannot be found, and it is only necessary to replace the suction temperature value in (2) in the above formula with the second value in the flow value table closest to the acquired suction temperature value.
When the acquired suction pressure value and the flow value at the acquired suction temperature value are calculated according to the third flow value, the fourth flow value and the first proportional relation, the formula according to which the suction pressure value can be inquired in the flow value table and the formula under the condition that the suction temperature value cannot be inquired is the same as that in the embodiment.
After the flow value of the refrigerant is obtained through the steps, the refrigerant allowance can be determined according to the ratio of the flow value to the standard flow value, and then the refrigerant charging amount is determined, and as the ratio of the flow value to the standard flow value is equal to the ratio of the refrigerant allowance to the standard refrigerant amount, the formula according to the steps is as follows:
Figure BDA0003050051540000131
M＝M0-M1；
wherein Q is1Is the flow value, Q0Is a standard flow value, M1For the remainder of the refrigerant, M0M is the refrigerant charge for the standard refrigerant amount. Wherein the standard refrigerant quantity is the content of the refrigerant in the refrigeration equipment specified in the design stage.
The present invention will be described in detail with reference to a specific example. Fig. 3 is a flowchart of a refrigerant charge amount calculation method according to another embodiment of the present invention, as shown in fig. 3, the method including:
and S1, after the refrigeration equipment is started and operated normally, respectively obtaining the air suction temperature value and the air suction pressure value of the compressor through the temperature value sensor and the pressure value sensor near the air suction port of the compressor.
And S2, measuring the corresponding flow values under different suction temperature values and different suction pressure values by a flowmeter arranged at the inlet of the indoor unit of the refrigeration equipment to form a refrigerant flow value table.
S3, the flow rate value of the refrigerant is obtained by direct calling or interpolation calculation.
After obtaining the flow value table, storing the table in the refrigeration equipmentIn the prior art, the flowmeter can be omitted from the actual refrigeration equipment, and different suction temperature values and flow values corresponding to different suction pressure values can be directly called, or the flow values can be obtained through interpolation calculation. Wherein, the row and column of the flow value table are respectively the suction pressure value P of the compressor1……PnAnd the value of the suction temperature T of the compressor1……Tn，P1… … Pn and T1……TnThe smaller the spacing between the refrigerant flow rate values, the more accurate the lookup or interpolation will be.
Figure BDA0003050051540000141
Q (i, j) in Table 1 above is the value of the suction temperature Ti and the value of the suction pressure PjThe corresponding flow rate value Q (i, j) under the working condition, i.e. Q (T, P) in the above embodiment. Wherein i is the serial number of the air suction temperature value, m is the serial number of the maximum air suction temperature value, j is the serial number of the air suction pressure value, and n is the serial number of the maximum air suction pressure.
Considering that the change of the suction pressure value P and the change of the suction temperature value T are continuous, the flow value table is difficult to cover the actual flow under all working conditions, and when the working conditions cannot be inquired in the table, the actual mass flow value of the refrigerant can be obtained by adopting interpolation calculation. The calculation method is as follows:
(1) and acquiring and recording a suction temperature value T and a suction pressure value P of the compressor.
(2) Based on the differential proportional relation, determining a proportional formula according to two suction temperature values which are closest to the acquired suction temperature value T and/or two suction pressure values which are closest to the acquired suction pressure value P in the flow value table;
(3) assuming a first value T closest to the value of the acquired inspiration temperatureNThrough the inspiration temperature value Ti, to a second value T closest to the acquired inspiration temperature valueN+1Then, the first value T closest to the acquired inspiration temperature value is obtained through the known first value T in the flow value tableNA second value TN +1 closest to the acquired value of the temperature of the induction air is calculated by a ratioFormula (II):
Figure BDA0003050051540000151
(i.e., a modification of formula (1) in the above-described embodiment); wherein Δ T (N +1, i) ═ TN+1-Ti，ΔT(N+1,N)＝TN+1-TN，ΔQ(N+1,i)＝Q(TN+1,P)-Q(T,P)，ΔQ(N+1,N)＝Q(TN+1,P)-Q(TNAnd P), the flow value corresponding to the air suction temperature value T and the air suction pressure value P can be calculated; assuming a first value P closest to the value of the acquired suction pressureNWhen the value is changed to a second value PN +1 which is closest to the acquired suction pressure value through the suction pressure value P, the first value P which is closest to the acquired suction pressure value and is known in the flow value table can be usedNA second value P closest to the acquired suction pressure valueN+1By a proportional formula:
Figure BDA0003050051540000152
(i.e., a variation of equation (2) in the above-described embodiment), where Δ P (N +1, j) ═ PN+1-P，ΔP(N+1,N)＝PN+1-PN，ΔQ(N+1,j)＝Q(T,PN+1)-Q(T,P)，ΔQ(N+1,N)＝Q(Ti,PN+1)-Q(Ti,PN) And calculating the flow values corresponding to the air suction temperature value T and the air suction pressure value P.
(4) If the inspiration temperature T exceeds the maximum inspiration temperature T in the flow value tablemOr the suction pressure value P exceeds the maximum suction pressure value P in the flow value meternOr the inspiration temperature value T is smaller than the minimum inspiration temperature value T in the flow value table or the inspiration pressure value P is smaller than the minimum inspiration pressure value P in the flow value table1Then, the following formula is adopted for calculation:
the temperature value T exceeds the maximum temperature value T in the flow value tablemThen, the following calculation formula is adopted:
Figure BDA0003050051540000161
the value of the suction pressure exceeds the maximum value of the suction pressure P in the flow meternThen, the following formula is adopted for calculation:
Figure BDA0003050051540000162
second, when the temperature T of inspiration is less than the minimum temperature T of inspiration in the flow value table1Then, the following calculation formula is adopted:
Figure BDA0003050051540000163
when the suction pressure value P is less than the minimum suction pressure value P in the flow value table1Then, the following formula is adopted for calculation:
Figure BDA0003050051540000164
when the flow value is calculated through the interpolation formula, the smaller the interval between two adjacent air suction pressure values or between two adjacent air suction temperature values in the flow value table is, the more accurate the result calculated by adopting the corresponding formula is.
And S4, calculating the theoretical standard flow rate of the refrigerant in the refrigeration equipment according to the operation mode of the refrigeration equipment and by combining the indoor temperature value obtained by the temperature sensing bulb on the indoor unit and the outdoor temperature value obtained by the temperature sensing bulb on the outdoor unit.
And S5, obtaining the percentage of the residual refrigerant in the refrigeration equipment to the standard refrigerant according to the ratio of the actual flow value to the standard flow value in the refrigeration equipment, further calculating the residual refrigerant in the refrigeration equipment, and further calculating the refrigerant charge.
Wherein the standard refrigerant quantity is the content of the refrigerant in the refrigeration equipment specified in the design stage. After the refrigerant charge is obtained, the value is displayed on a controller of the refrigeration equipment, so that a service person can conveniently check the amount of refrigerant to be charged in the refrigeration equipment.
The design idea of the steps is as follows: according to the fact that the percentage of the residual quantity of the refrigerant in the refrigeration equipment to the standard refrigerant quantity is equal to the ratio of the actual flow value to the standard flow value, the residual quantity of the refrigerant in the refrigeration equipment is converted into the flow value of the refrigerant in the refrigeration equipment, then the residual quantity of the refrigerant is calculated according to the flow value of the refrigerant, and further the refrigerant charging quantity of the refrigeration equipment is calculated. The specific calculation formula is as follows:
Figure BDA0003050051540000171
M＝M0-M1；
wherein Q is1Is the flow value, Q0Is a standard flow value, M1For the remainder of the refrigerant, M0M is the refrigerant charge for the standard refrigerant amount. Wherein the standard refrigerant quantity is the content of the refrigerant in the refrigeration equipment specified in the design stage.
Example 3
The present embodiment provides a refrigerant charge amount calculation apparatus, and fig. 4 is a block diagram of the refrigerant charge amount calculation apparatus according to the embodiment of the present invention, as shown in fig. 4, the apparatus including:
the first obtaining module 10 is configured to obtain a suction pressure value and a suction temperature value of the compressor.
During specific implementation, after the refrigeration equipment is normally started and operated, the air suction temperature value and the air suction pressure value of the compressor can be respectively obtained through the temperature value sensor and the pressure value sensor which are arranged near the air suction port of the compressor.
The second obtaining module 20 is configured to query a flow value corresponding to the obtained inspiration pressure value and inspiration temperature value based on the flow value table; the flow value table is used for representing the corresponding relation among the inspiration pressure value, the inspiration temperature value and the flow value.
In the prior art, the suction specific volume of the compressor is generally found out according to the suction temperature value and the suction pressure value of the compressor, the discharge capacity of the compressor is found out according to a design manual, the frequency of the compressor is collected, and the flow value of the refrigerant in the refrigeration equipment, namely the ratio of the discharge capacity of the compressor to the frequency of the compressor to the suction specific volume of the compressor is calculated. However, the flow rate value of the refrigerant obtained by the above method has a certain error from the actual flow rate value of the refrigerant, which causes an error in the final refrigerant charge amount. In order to avoid an error in the flow rate value of the refrigerant, in the present embodiment,will inhale temperature value T1、T2、T3…TmAs a line, the suction pressure value P is set1、P2、P3…PnAnd as a column, obtaining a flow value table according to the corresponding flow meter measured values under the same inspiration temperature value and different inspiration pressure values and the corresponding flow values under the same inspiration pressure value and different inspiration temperature values, wherein Q (T, P) is a flow value determined by taking the ith inspiration temperature value as a row and the jth inspiration pressure value as a column.
In the concrete implementation, a flowmeter can be arranged at the inlet of the indoor unit of the refrigeration equipment, the flowmeter is used for measuring the flow values of the refrigerant under different suction temperature values and suction pressure values to form a flow value table, the flow value table is stored in the refrigeration equipment, then the flowmeter can be omitted from the actual refrigeration equipment, and the flow value table is directly inquired through the suction temperature value and the suction pressure value of the compressor to obtain the flow value of the refrigerant in the refrigeration equipment. The transverse rows of the flow value meter are respectively the suction pressure value P of the compressor1、P2、P3…PnAnd a value of inspiration temperature T1、T2、T3…TmTaking the suction pressure value as the row and the suction temperature value of the compressor, P1……PnAnd T1……TmThe smaller the spacing therebetween, the more accurate the actual mass value of the refrigerant is obtained. In this embodiment, the actual mass value is a mass flow value.
And a calculation module 30 for calculating the refrigerant charge according to the flow value.
Example 4
In this embodiment, another refrigerant charge amount calculation apparatus is provided, and fig. 5 is a structural diagram of a refrigerant charge amount calculation apparatus according to another embodiment of the present invention, because it is considered that the changes of the suction pressure value P and the suction temperature value T are continuous, and it is difficult to include all the suction temperature values and the suction pressure values in the flow value table, so that the flow value query under all the operating conditions cannot be completed, and in the case that the suction temperature value T and/or the suction pressure value P cannot be queried in the flow value table, the actual refrigerant mass flow value may be obtained by using interpolation calculation, so as shown in fig. 5, the second obtaining module 20 specifically includes:
a determining unit 201, configured to determine whether a value completely consistent with the acquired suction pressure value and the acquired suction temperature value can be queried in the flow value table; a first obtaining unit 202, configured to directly determine a flow value corresponding to the obtained inspiration pressure value and inspiration temperature value when a value that is completely consistent with the obtained inspiration pressure value and inspiration temperature value can be queried in the flow value table; a second obtaining unit 203, configured to, when a value that is completely consistent with the obtained suction pressure value and suction temperature value cannot be found in the flow value table, determine a flow value based on the flow value table through an interpolation calculation according to the suction pressure value and/or suction temperature value and the suction temperature value and/or suction pressure value in the flow value table.
In a specific implementation, in order to estimate the flow value corresponding to the unknown intake pressure value and the unknown intake temperature value by interpolation according to the flow value corresponding to the known intake pressure value and intake temperature value in the flow value table, the second obtaining unit 203 is specifically configured to: when only a value which is completely consistent with one of the two parameters of the acquired suction pressure value and the acquired suction temperature value can be inquired in the flow value table, the following operations are performed: determining a first value and a second value which are closest to the parameter which can not be inquired in a flow value table; determining the proportional relation between the first value and the second value and the parameter which cannot be inquired; and determining flow values corresponding to the inspiration pressure value and the inspiration temperature value according to the parameters which can be inquired in the flow value table, the parameters which can not be inquired, the first value, the second value and the proportional relation.
For example, if the value of the suction pressure can be found in the flow rate value table, and if the value of the suction temperature cannot be found, the following operations are triggered: determining a first value closest to the inspiration temperature value and a second value closest to the inspiration temperature value in a flow value table according to the acquired inspiration temperature value; and calculating the acquired suction pressure value and the flow value at the acquired suction temperature value according to the acquired suction temperature value, the first value closest to the suction temperature value, the second value closest to the suction temperature value and the acquired suction pressure value.
When calculating the inspiration pressure value and the flow value under the inspiration temperature value according to the inspiration temperature value, the first value closest to the acquired inspiration temperature value, the second value closest to the acquired inspiration temperature value and the inspiration pressure value, the formula is as follows:
Figure BDA0003050051540000191
wherein T is the value of the inspiration temperature, TNIs the first value, T, in the flow value table closest to the acquired inspiratory temperature valueN+1Is the second value closest to the acquired inspiration temperature value in the flow value table, P is the inspiration pressure value, Q (T)NP) is the flow value corresponding to the first value closest to the value of the intake air temperature obtained and the value of the intake air pressure, Q (T)N+1P) is a flow value corresponding to the second value closest to the acquired intake temperature value and the intake pressure value, Q (T, P) is a flow value to be determined, and N is a serial number of the first value closest to the acquired intake temperature value in the flow value table.
For another example, when the inspiration temperature value can be inquired in the flow value table and the inspiration pressure value cannot be inquired, the following operations are triggered: determining a first value closest to the suction pressure value and a second value closest to the suction pressure value in a flow value table according to the acquired suction pressure value; and calculating flow values at the suction pressure value and the suction temperature value according to the acquired suction temperature value, the first value closest to the suction pressure value, the second value closest to the suction pressure value and the acquired suction pressure value.
When the flow values under the suction pressure value and the suction temperature value are calculated according to the acquired suction temperature value, the first value closest to the suction pressure value, the second value closest to the suction pressure value and the acquired suction pressure value, the formula is as follows:
Figure BDA0003050051540000192
wherein P is the value of the suction pressure, PNIs the first value, P, in the flow value table closest to the acquired suction pressure valueN+1Is the second value closest to the acquired suction pressure value in the flow value table, T is the suction temperature value, Q (T, P)N) Is the flow value corresponding to the first value closest to the acquired suction pressure value and the suction temperature value, Q (T, P)N+1) Q (T, P) is a flow value required to be determined, and N is a serial number of a first value which is closest to the acquired air suction temperature value in a flow value table.
The second obtaining unit 103 is further configured to: if a value that is completely identical to the acquired suction pressure value cannot be found in the flow rate value table, and a value that is completely identical to the acquired suction temperature value cannot be found, the following operations are performed: determining a first value and a second value which are closest to one of the parameters which cannot be queried and a third value and a fourth value which are closest to the other parameter which cannot be queried in the flow value table; determining a first proportional relationship between the first value and the second value and one of the parameters which cannot be queried, and a second proportional relationship between the third value and the fourth value and the other parameter which cannot be queried; and determining the acquired inspiration pressure value and the acquired flow value corresponding to the inspiration temperature value according to the parameter which cannot be inquired, the first value, the second value, the third value, the fourth value, the first proportional relation and the second proportional relation.
Specifically, the method comprises the following steps: determining a first flow value corresponding to one of the parameters which cannot be inquired and a third value according to the one of the parameters which cannot be inquired, the first value, the second value, the third value and the first proportional relation; determining a second flow value corresponding to one of the parameters which cannot be queried and the third value according to the first value, the second value, the fourth value and the first proportional relation; and determining the flow values corresponding to the acquired inspiration pressure value and the acquired inspiration temperature value according to the first flow value, the second flow value, the third value, the fourth value and the second proportional relation.
For example, when the value of the suction pressure cannot be found in the flow rate value table, and the value of the suction temperature cannot be found, the following operations are triggered by the second obtaining unit 303:
determining a first value closest to the inspiration temperature value and a second value closest to the inspiration temperature value in a flow value table according to the acquired inspiration temperature value; determining a first value closest to the suction pressure value and a second value closest to the suction pressure value in a flow value table according to the acquired suction pressure value; determining a first proportional relationship among the acquired inhalation temperature value, a first value closest to the inhalation temperature value in the flow value table, and a second proportional relationship among the acquired inhalation pressure, the first value closest to the inhalation pressure value in the flow value table, and the second value closest to the inhalation pressure value in the flow value table.
The first value in the first proportional relationship and flow value table closest to the acquired suction pressure value may be used to determine the first flow value in the first value in the acquired suction temperature value and flow value table closest to the acquired suction pressure value, the second value in the first proportional relationship and flow value table closest to the acquired suction pressure value may be used to determine the second flow value in the second value in the acquired suction temperature value and flow value table closest to the acquired suction pressure value, and the acquired suction pressure value and the flow value in the acquired suction temperature value may be calculated according to the first flow value, the second flow value, and the second proportional relationship.
In other embodiments of the present invention, the third flow value in the flow value table and the first value closest to the acquired inhalation temperature value in the second proportional relationship and the first value closest to the acquired inhalation temperature value in the flow value table may be determined first, the fourth flow value in the flow value table and the second value closest to the acquired inhalation temperature value in the acquired inhalation pressure value and the flow value corresponding to the acquired inhalation temperature value in the flow value table may be determined according to the second proportional relationship and the second value closest to the acquired inhalation temperature value in the flow value table, and then the flow value corresponding to the acquired inhalation pressure value and the acquired inhalation temperature value may be determined according to the third flow value and the fourth flow value.
After the flow value of the refrigerant is obtained through the above steps, the calculation module 30 may determine the refrigerant surplus according to the ratio of the flow value to the standard flow value, and further determine the refrigerant charge amount, because the ratio of the flow value to the standard flow value is equal to the ratio of the refrigerant surplus to the standard refrigerant amount, the formula according to the above steps is:
Figure BDA0003050051540000211
M＝M0-M1；
wherein Q is1Is the flow value, Q0Is a standard flow value, M1For the remainder of the refrigerant, M0M is the refrigerant charge for the standard refrigerant amount. Wherein the standard refrigerant quantity is the content of the refrigerant in the refrigeration equipment specified in the design stage.
Example 5
This embodiment provides a refrigeration apparatus, and fig. 6 is a structural diagram of a refrigeration apparatus according to an embodiment of the present invention, as shown in fig. 6, the refrigeration apparatus includes: the indoor unit 4a, the outdoor unit 4b and the compressor 1, further comprising an oil separator 2, a four-way valve 3, an electronic expansion valve 5, a first valve 6a, a flowmeter 7, a second valve 6b, a gas-liquid separator 8, a temperature value sensor 9a and a pressure value sensor 9b, and further comprising the refrigerant charge calculation device (not shown in the figure), for solving the problem that the actual flow obtained by calculating the suction temperature value and the suction pressure value has a certain error with the flow value under the actual condition, which causes the inaccuracy of the refrigerant charge calculation value, and improving the accuracy of the refrigerant charge calculation.
Example 6
The present embodiment provides a computer-readable storage medium on which a computer program is stored, which when executed by a processor, implements the refrigerant charge amount calculation method in the above-described embodiments.
The above-described embodiments of the apparatus are merely illustrative, and the units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of the present embodiment.
Through the above description of the embodiments, those skilled in the art will clearly understand that each embodiment can be implemented by software plus a necessary general hardware platform, and certainly can also be implemented by hardware. With this understanding in mind, the above-described technical solutions may be embodied in the form of a software product, which can be stored in a computer-readable storage medium such as ROM/RAM, magnetic disk, optical disk, etc., and includes instructions for causing a computer device (which may be a personal computer, a server, or a network device, etc.) to execute the methods described in the embodiments or some parts of the embodiments.
Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.

Claims (11)

1. A refrigerant charge amount calculation method, characterized by comprising:
acquiring a suction pressure value and a suction temperature value of the compressor;
inquiring a flow value corresponding to the inspiration pressure value and the inspiration temperature value based on a flow value table; the flow value table is used for representing the corresponding relation among the inspiration pressure value, the inspiration temperature value and the flow value;
and calculating the refrigerant charge according to the flow value.
2. The method of claim 1, wherein querying the flow value corresponding to the inspiratory pressure value and the inspiratory temperature value based on a flow value table comprises:
judging whether a numerical value which is completely consistent with the inspiration pressure value and the inspiration temperature value can be inquired in the flow value table;
if yes, directly determining flow values corresponding to the inspiration pressure value and the inspiration temperature value;
and if not, determining the flow value based on the flow value table in an interpolation calculation mode.
3. The method of claim 2, wherein determining the flow value based on the table of flow values by way of interpolation comprises:
if only a value which is completely consistent with one of the two parameters of the suction pressure value and the suction temperature value can be inquired in the flow value table, the following operations are carried out:
determining a first value and a second value which are closest to the parameter which can not be inquired in the flow value table;
determining a proportional relationship between the first value and the second value and the parameter that cannot be queried;
and determining the flow value according to the parameters which can be inquired in the flow value table, the parameters which cannot be inquired, the first value, the second value and the proportional relation.
4. The method of claim 3, wherein if the queryable parameter is an inspiratory pressure value, determining the flow value based on the queryable parameter, the first value, the second value, and the proportional relationship in the flow value table according to the formula:
Figure FDA0003050051530000011
wherein T is the inspiration temperature value, TNIs the first value, T, in the flow value table closest to the inspiratory temperature valueN+1Is the second value closest to the inspiration temperature value in the flow value table, P is the inspiration pressure value, Q (T)NP) is the flow value corresponding to the first value closest to the value of the suction temperature and the value of the suction pressure, Q (T)N+1P) is a flow value corresponding to a second value closest to the inspiration temperature value and the inspiration pressure value, Q (T, P) is a flow value to be determined, and N is a serial number of a first value closest to the inspiration temperature value in the flow value table.
5. The method of claim 3, wherein if the queryable parameter is an inspiratory temperature value, determining the flow value based on the queryable parameter, the first value, the second value, and the proportional relationship in the flow value table according to the formula:
Figure FDA0003050051530000021
wherein P is the suction pressure value, PNIs the first value, P, in the flow value table closest to the suction pressure valueN+1Is the second value closest to the suction pressure value in the flow value table, T is the suction temperature value, Q (T, P)N) Is the flow value corresponding to the first value closest to the suction pressure value and the suction temperature value, Q (T, P)N+1) The flow value corresponding to the second value closest to the suction pressure value and the suction temperature value is Q (T, P) the flow value to be determined, and N is the sequence of the first value closest to the suction pressure value in the flow value tableNumber (n).
6. The method of claim 2, wherein determining the flow value based on the table of flow values by way of an interpolation calculation, further comprises:
if a value that is completely consistent with the suction pressure value cannot be inquired in the flow value table, and a value that is completely consistent with the suction temperature value cannot be inquired, performing the following operations:
determining a first value and a second value which are closest to one of the parameters which cannot be queried and a third value and a fourth value which are closest to the other parameter which cannot be queried in the flow value table;
determining a first proportional relationship of the first and second values to one of the non-queryable parameters and a second proportional relationship of the third and fourth values to the other of the non-queryable parameters;
determining the flow value according to one of the parameters that cannot be queried, the first value, the second value, the third value, the fourth value, the first proportional relationship, and the second proportional relationship.
7. The method of claim 6, wherein determining the flow value based on one of the non-queryable parameters, the first value, the second value, the third value, the fourth value, the first proportional relationship, and the second proportional relationship comprises:
determining a first flow value corresponding to one of the parameters which cannot be queried and the third value according to the one of the parameters which cannot be queried, the first value, the second value, the third value and the first proportional relation;
determining a second flow value corresponding to one of the parameters which cannot be queried and the third value according to the first value, the second value, the fourth value and the first proportional relation;
and determining the flow value according to the first flow value, the second flow value and the second proportional relation.
8. The method of claim 1, wherein the refrigerant charge is calculated from the flow value according to the formula:
Figure FDA0003050051530000031
M＝M0-M1；
wherein Q is1Is the flow rate value, Q0Is a standard flow value, M1For the remainder of the refrigerant, M0M is the refrigerant charge for the standard refrigerant amount.
9. A refrigerant charge amount calculation apparatus, characterized by comprising:
the first acquisition module is used for acquiring a suction pressure value and a suction temperature value of the compressor;
the second acquisition module is used for inquiring flow values corresponding to the inspiration pressure value and the inspiration temperature value based on a flow value table; the flow value table is used for representing the corresponding relation among the inspiration pressure value, the inspiration temperature value and the flow value;
and the calculating module is used for calculating the refrigerant charging quantity according to the flow value.
10. A refrigerating apparatus comprising an indoor unit, an outdoor unit and a compressor, further comprising the refrigerant charge amount calculating device according to claim 9.
11. A computer-readable storage medium, on which a computer program is stored, which program, when being executed by a processor, carries out the method according to any one of claims 1 to 8.
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Application publication date: 20210723