CN107477798B - method and device for controlling refrigerant of air conditioner and air conditioner - Google Patents
method and device for controlling refrigerant of air conditioner and air conditioner Download PDFInfo
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- CN107477798B CN107477798B CN201710784571.2A CN201710784571A CN107477798B CN 107477798 B CN107477798 B CN 107477798B CN 201710784571 A CN201710784571 A CN 201710784571A CN 107477798 B CN107477798 B CN 107477798B
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- air conditioner
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- electronic expansion
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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
- F25B41/00—Fluid-circulation arrangements
- F25B41/30—Expansion means; Dispositions thereof
- F25B41/31—Expansion valves
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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
- F25B41/00—Fluid-circulation arrangements
- F25B41/30—Expansion means; Dispositions thereof
- F25B41/37—Capillary tubes
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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
- F25B2600/00—Control issues
- F25B2600/25—Control of valves
- F25B2600/2513—Expansion valves
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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
- F25B2700/00—Sensing or detecting of parameters; Sensors therefor
- F25B2700/21—Temperatures
- F25B2700/2117—Temperatures of an evaporator
- F25B2700/21175—Temperatures of an evaporator of the refrigerant at the outlet of the evaporator
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Mechanical Engineering (AREA)
- Thermal Sciences (AREA)
- General Engineering & Computer Science (AREA)
- Air Conditioning Control Device (AREA)
Abstract
the embodiment of the invention provides a method and a device for controlling a refrigerant of an air conditioner and the air conditioner, and belongs to the field of household appliances. The method comprises the steps of determining the number of internal machines participating in operation in the air conditioner in the operation process of the air conditioner; judging whether the quantity changes in the process of continuously operating the air conditioner for a preset time; under the condition that the quantity is not changed, the refrigerant of the air conditioner is controlled according to the superheat degree control method; and controlling the refrigerant of the air conditioner according to the average temperature control method under the condition that the quantity is changed. The apparatus includes a controller. The air conditioner comprises the device. Therefore, the refrigerant of the air conditioner is selected to be controlled according to the average temperature control method or the superheat degree control method according to whether the number of the indoor units participating in operation changes, so that the efficiency of the heat exchangers of the indoor units can be fully utilized, and the refrigerant distribution among the indoor units can be considered.
Description
Technical Field
the invention relates to the field of household appliances, in particular to a method and a device for controlling a refrigerant of an air conditioner and the air conditioner.
background
Refrigerant, commonly known as snow, is a working fluid used in refrigeration air conditioning systems to transfer heat energy to produce a refrigeration effect. According to the working mode, the refrigerant can be divided into a primary refrigerant and a secondary refrigerant; the refrigerant may be divided into natural refrigerant and synthetic refrigerant according to the material properties. At present, refrigerant control in an air-conditioning refrigeration mode generally adopts a superheat degree control method or an average temperature control method. The superheat degree control can fully utilize the efficiency of the heat exchanger, but the refrigerant distribution of each indoor unit cannot be well considered when the multi-split system is adopted, so that the refrigerant distribution among the indoor units is uneven easily. The average temperature control method can well give consideration to the refrigerant distribution of each internal machine, but neglects the heat exchange of the internal machines.
disclosure of Invention
the embodiment of the invention aims to provide a method and a device for controlling a refrigerant of an air conditioner and the air conditioner, which can realize the purposes of fully utilizing the efficiency of a heat exchanger of an inner machine and giving consideration to the refrigerant distribution among the inner machines.
in order to achieve the above object, an aspect of an embodiment of the present invention provides a method for controlling a refrigerant of an air conditioner, the method including determining a number of internal machines in operation of the air conditioner during operation of the air conditioner; judging whether the quantity is changed in the process of continuously operating the air conditioner for a preset time; under the condition that the quantity is not changed, controlling a refrigerant of the air conditioner according to a superheat degree control method; and controlling the refrigerant of the air conditioner according to an average temperature control method under the condition that the quantity is changed.
Optionally, the method further comprises: and before the quantity is determined, controlling the refrigerant of the air conditioner according to the average temperature control method.
Optionally, the average temperature control method includes: detecting an outlet temperature of an evaporator corresponding to each of the internal machines; calculating an average value of the outlet temperatures of the evaporators according to the detected outlet temperatures of the evaporators and the number; and adjusting the opening degree of the electronic expansion valve corresponding to each evaporator according to the outlet temperature of the evaporator and the average value of the outlet temperatures of the evaporators.
optionally, the adjusting the opening degree of the electronic expansion valve corresponding to each evaporator according to the outlet temperature of the evaporator and the average value of the outlet temperatures of the evaporators comprises: calculating a difference between the outlet temperature of each evaporator and the average of the evaporator outlet temperatures; and at least one of: maintaining an opening degree of an electronic expansion valve corresponding to the evaporator in a case where an absolute value of the difference is less than or equal to a predetermined value; increasing the opening degree of an electronic expansion valve corresponding to the evaporator when the difference is larger than the predetermined value; and reducing the opening degree of the electronic expansion valve corresponding to the evaporator in the case where the difference is smaller than the opposite value of the predetermined value.
optionally, the superheat degree control method includes: detecting an outlet temperature of an evaporator corresponding to each of the internal machines; detecting an inlet temperature of a shunt capillary in the evaporator; calculating a difference between the outlet temperature and the inlet temperature; and adjusting the opening degree of the electronic expansion valve corresponding to the evaporator according to the relation between the difference value and the preset range.
Another aspect of an embodiment of the present invention provides an apparatus for controlling a refrigerant of an air conditioner, the apparatus including: a controller to: determining the number of the internal machines participating in operation in the air conditioner in the operation process of the air conditioner; judging whether the quantity is changed in the process of continuously operating the air conditioner for a preset time; under the condition that the quantity is not changed, controlling a refrigerant of the air conditioner according to a superheat degree control method; and controlling the refrigerant of the air conditioner according to an average temperature control method under the condition that the quantity is changed.
optionally, the controller is further configured to control the refrigerant of the air conditioner according to the average temperature control method before determining the number.
optionally, the apparatus further comprises: a first temperature sensor for detecting an outlet temperature of the evaporator corresponding to each of the indoor units; the controller is further configured to: calculating an average value of the outlet temperatures of the evaporators according to the detected outlet temperatures of the evaporators and the number; and adjusting the opening degree of the electronic expansion valve corresponding to each evaporator according to the outlet temperature of the evaporator and the average value of the outlet temperatures of the evaporators.
Optionally, the controller is configured to adjust an opening degree of an electronic expansion valve corresponding to each evaporator according to an outlet temperature of the evaporator and an average value of the outlet temperatures of the evaporators by: calculating the difference between the outlet temperature of each evaporator and the average value of the outlet temperatures of the evaporators; and at least one of: maintaining an opening degree of an electronic expansion valve corresponding to the evaporator in a case where an absolute value of the difference is less than or equal to a predetermined value; increasing the opening degree of an electronic expansion valve corresponding to the evaporator when the difference is larger than the predetermined value; and reducing the opening degree of the electronic expansion valve corresponding to the evaporator in the case where the difference is smaller than the opposite value of the predetermined value.
optionally, the apparatus further comprises: a first temperature sensor for detecting an outlet temperature of the evaporator corresponding to each of the indoor units; and a second temperature sensor for detecting an inlet temperature of a shunt capillary in the evaporator; the controller is further configured to: calculating a difference between the outlet temperature and the inlet temperature; and adjusting the opening degree of the electronic expansion valve corresponding to the evaporator according to the relation between the difference value and the preset range.
Another aspect of the embodiments of the present invention provides an air conditioner, which includes the above-mentioned apparatus.
According to the technical scheme, the refrigerant of the air conditioner is controlled according to the superheat control method or the average temperature control method according to the change of the number of the indoor units participating in the operation within the preset time of the continuous operation of the air conditioner, rather than the refrigerant of the air conditioner is controlled only by the superheat control method or the average temperature control method, the superheat control method can fully utilize the efficiency of the heat exchangers of the indoor units, and the average temperature control method can give consideration to the refrigerant distribution among the indoor units, so that the efficiency of the heat exchangers of the indoor units can be fully utilized, and the refrigerant distribution among the indoor units can be considered.
Additional features and advantages of embodiments of the invention will be set forth in the detailed description which follows.
drawings
The accompanying drawings, which are included to provide a further understanding of the embodiments of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the embodiments of the invention without limiting the embodiments of the invention. In the drawings:
Fig. 1 is a flowchart illustrating a method for controlling a refrigerant of an air conditioner according to an embodiment of the present invention;
Fig. 2 is a flowchart illustrating a method for controlling a refrigerant of an air conditioner according to another embodiment of the present invention;
FIG. 3 is a flow chart of a method for average temperature control according to an embodiment of the present invention;
FIG. 4 is a flow chart of a superheat control method provided in accordance with an embodiment of the invention;
FIG. 5 is a schematic diagram of an embodiment of the present invention providing for adjusting the opening of the electronic expansion valve based on superheat;
FIG. 6 is a schematic diagram of an electronic expansion valve opening adjustment based on superheat provided by another embodiment of the invention;
fig. 7 is a block diagram illustrating an apparatus for controlling a refrigerant of an air conditioner according to an embodiment of the present invention;
Fig. 8 is a block diagram illustrating an apparatus for controlling a refrigerant of an air conditioner according to another embodiment of the present invention; and
fig. 9 is a block diagram illustrating an apparatus for controlling a refrigerant of an air conditioner according to another embodiment of the present invention.
Description of the reference numerals
1 controller 2, 3 first temperature sensor
4 second temperature sensor
Detailed Description
the following detailed description of embodiments of the invention refers to the accompanying drawings. It should be understood that the detailed description and specific examples, while indicating embodiments of the invention, are given by way of illustration and explanation only, not limitation.
the air conditioner is divided into an indoor unit and an outdoor unit, wherein the indoor unit is mainly provided with a heat exchanger assembly (an evaporator assembly and a condenser assembly), a fan, a stop valve, an electric control assembly and the like. The outdoor unit mainly comprises a compressor, a gas-liquid separator, a heat exchanger assembly (an evaporator assembly and a condenser assembly), an extension set, a stop valve, an electric control assembly and the like. Meanwhile, a necessary connecting pipe assembly is arranged between the indoor unit and the outdoor unit. In the embodiment of the present invention, the indoor units are all referred to as indoor units.
an aspect of an embodiment of the present invention provides a method for controlling a refrigerant of an air conditioner. Fig. 1 is a flowchart illustrating a method for controlling a refrigerant of an air conditioner according to an embodiment of the present invention. As shown in fig. 1, the method includes:
Step S10: determining the number of the internal machines, namely determining the number of the internal machines participating in the operation of the air conditioner in the operation process of the air conditioner;
step S11: judging whether the quantity is changed, namely judging whether the quantity is changed in the process of continuously operating the air conditioner for a preset time, if so, executing the step S13, otherwise, executing the step S12;
Step S12: controlling the refrigerant of the air conditioner according to a superheat degree control method, namely controlling the refrigerant of the air conditioner according to the superheat degree control method under the condition that the quantity is not changed; and
Step S13: the refrigerant of the air conditioner is controlled according to the average temperature control method, that is, the refrigerant of the air conditioner is controlled according to the average temperature control method when the number of the refrigerant changes.
The refrigerant of the air conditioner is controlled according to the superheat degree control method or the average temperature control method according to whether the number of the indoor units participating in operation changes within the preset time of continuous operation of the air conditioner, rather than the refrigerant of the air conditioner is controlled only by the superheat degree control method or the average temperature control method, the superheat degree control method can fully utilize the efficiency of the heat exchangers of the indoor units, and the average temperature control method can give consideration to the refrigerant distribution among the indoor units, so that the efficiency of the heat exchangers of the indoor units can be fully utilized, and the refrigerant distribution among the indoor units can be considered.
in addition, in the embodiment of the invention, before the number of the internal machines participating in the operation of the air conditioner in the operation process of the air conditioner is determined, the refrigerant of the air conditioner can be controlled according to the average temperature control method.
Fig. 2 is a flowchart illustrating a method for controlling a refrigerant of an air conditioner according to another embodiment of the present invention. As shown in fig. 2, the method includes:
step S20: controlling a refrigerant of the air conditioner according to the average temperature control method;
step S21: determining the number of the internal machines, namely determining the number of the internal machines participating in the operation of the air conditioner in the operation process of the air conditioner;
step S22: judging whether the quantity is changed, namely judging whether the quantity is changed in the process of continuously operating the air conditioner for a preset time, if so, executing the step S20, otherwise, executing the step S23;
step S23: controlling a refrigerant of the air conditioner according to a superheat degree control method; and
Step S24: it is determined whether the number is changed, that is, whether the number is changed during the air conditioner is continuously operated for a predetermined time, if so, step S20 is performed, otherwise, step S23 is performed.
Fig. 3 is a flowchart of an average temperature control method according to an embodiment of the present invention. As shown in fig. 3, the average temperature control method includes:
step S30: detecting the outlet temperature of the evaporator, namely detecting the outlet temperature of the evaporator corresponding to each internal machine participating in operation in the operation of the air conditioner;
Step S31: calculating an average value of the outlet temperature of the evaporator, namely calculating the average value of the outlet temperature of the evaporator according to the detected temperatures of all evaporators and the number of the internal machines participating in operation; and
Step S32: the opening degree of the electronic expansion valve corresponding to the evaporator is adjusted, that is, the opening degree of the electronic expansion valve corresponding to the evaporator is adjusted according to the average value of the outlet temperature of each evaporator and the outlet temperature of the evaporator.
Preferably, adjusting the opening degree of the electronic expansion valve corresponding to each evaporator according to the average value of the outlet temperature of the evaporator and the outlet temperature of the evaporator may include: calculating the difference value of the outlet temperature of each evaporator and the average value of the outlet temperatures of the evaporators; and at least one of: maintaining an opening degree of an electronic expansion valve corresponding to the evaporator in a case where an absolute value of the difference is less than or equal to a predetermined value; in the case that the difference is greater than the predetermined value, increasing the opening degree of the electronic expansion valve corresponding to the evaporator, such as increasing the electronic expansion valve B P; and decreasing B P the opening degree of the electronic expansion valve corresponding to the evaporator in the case where the difference is smaller than the opposite of the predetermined value. Where P is the unit of opening, step. In general, B has a value in the range of 16 to 32. The predetermined value can be selected according to the requirements of users, and the value of the predetermined value is generally between 0.5 and 2 ℃. The inverse value is the inverse of the predetermined value, for example, if the predetermined value is 1, the inverse value is-1.
Fig. 4 is a flowchart of a superheat degree control method according to an embodiment of the present invention. As shown in fig. 4, the superheat degree control method includes:
Step S40: detecting the outlet temperature of the evaporator, namely detecting the outlet temperature of the evaporator corresponding to each internal machine participating in operation in the operation of the air conditioner;
step S41: detecting the inlet temperature of the shunt capillary, namely detecting the inlet temperature of the shunt capillary in the evaporator;
step S42: calculating a difference value, namely calculating the difference value between the inlet temperature of the shunt capillary and the outlet temperature of the evaporator, wherein the difference value is the superheat degree; and
Step S43: the opening degree of the electronic expansion valve corresponding to the evaporator is adjusted, that is, the opening degree of the electronic expansion valve corresponding to the evaporator is adjusted according to the relationship between the difference value and the predetermined range.
in this embodiment, when detecting the inlet temperature of the shunt capillary, only the inlet temperature of a certain branch of the evaporator may be detected, and the difference between the inlet temperature of the branch of the evaporator and the outlet temperature of the evaporator may be calculated. In addition, the inlet temperature of the multi-path shunt capillary tube can be detected, the temperature average value of the inlet temperature of the multi-path shunt capillary tube is calculated, the difference value between the temperature average value and the outlet temperature of the evaporator is calculated, and the opening degree of the electronic expansion valve corresponding to the evaporator is adjusted according to the relation between the difference value between the temperature average value and the outlet temperature of the evaporator and a preset range, so that the difference value falls into the preset range. Wherein when the degree of superheat (i.e., the difference between the average temperature and the evaporator outlet temperature) is within the predetermined range, the opening degree of the electronic expansion valve at that time is kept constant. In addition, the predetermined range may be selected according to user requirements, as shown in FIG. 5, between c1 and b1, and specifically, may be 3-5. In fig. 5, the vertical axis represents the degree of superheat, i.e., the above-described difference, the arrow indicates an increase or decrease in the degree of superheat, the arrow indicates an increase in the degree of superheat, and the arrow indicates a decrease in the degree of superheat. When the degree of superheat is less than d1, the opening degree of the electronic expansion valve is decreased, see fig. 5, by B P. When the degree of superheat is between d1 and c1, the opening degree of the electronic expansion valve is decreased, as shown in fig. 5, and AP is decreased. When the degree of superheat is between c1 and b1, the opening degree of the electronic expansion valve is maintained. When the degree of superheat is between b1 and a1, the opening degree of the electronic expansion valve is increased, as shown in fig. 5, A P is increased. When the degree of superheat exceeds a1, the opening degree of the electronic expansion valve is increased, B P as shown in fig. 5. In order to make the degree of superheat fall within a predetermined range as quickly as possible during actual operation, the correspondence between the range of the degree of superheat and the degree of adjustment of the opening degree of the electronic expansion valve may be slightly adjusted. As shown in fig. 5, when the degree of superheat is greater than a2, the degree of adjustment for the opening degree of the electronic expansion valve is increased B P as is the case when the degree of superheat is greater than a 1. When the degree of superheat is b2 to a2, the degree of adjustment of the opening degree of the electronic expansion valve is the same as when the degree of superheat is b1 to a 1. When the degree of superheat is in the range of c2 to b2, the degree of adjustment for the opening degree of the electronic expansion valve is the same as when the degree of superheat is in the range of c1 to b1, i.e., the current opening degree of the electronic expansion valve is maintained constant. When the degree of superheat is d2 to c2, the degree of adjustment of the opening degree of the electronic expansion valve is the same as when the degree of superheat is d1 to c 1. When the degree of superheat is less than d2, the degree of adjustment for the opening degree of the electronic expansion valve is the same as when the degree of superheat is less than d 1. In fig. 6, specific values are given to a1, b1, c1, d1, a2, b2, c2, and d2, where a1 is 10, b1 is 5, c1 is 3d1 is 0, a2 is 9, b2 is 4, c2 is 2, and d2 is-1. The following explains how, with reference to an example, the degree of superheat falls within a range in which the opening degree of the electronic expansion valve is kept constant as soon as possible after the above adjustment. Assuming that the superheat degree is 15 before adjustment, the opening degree of the electronic expansion valve is increased by BP within a range larger than 10, assuming that the superheat degree is 9 after adjustment of the electronic expansion valve, the opening degree of the electronic expansion valve should be increased A P according to the corresponding relation between the range of the superheat degree and the adjustment degree of the electronic expansion valve before adjustment, and the opening degree of the electronic expansion valve is increased B P according to the corresponding relation after adjustment, whereas B is larger than A, it can be understood that the opening degree of the electronic expansion valve is increased B P to A P, and the superheat degree can fall within the range of 3-5 as soon as possible. In addition, through the adjustment, the range of the superheat degree corresponding to the unchanged opening degree of the electronic expansion valve is adjusted, and when the superheat degree is between 2 and 4, the opening degree of the electronic expansion valve is also kept unchanged, so that the superheat degree can fall into the range corresponding to the unchanged opening degree of the electronic expansion valve as soon as possible.
another aspect of the embodiments of the present invention provides an apparatus for controlling a refrigerant of an air conditioner. Fig. 7 is a block diagram illustrating a configuration of an apparatus for controlling a refrigerant of an air conditioner according to an embodiment of the present invention. As shown in fig. 7, the apparatus includes a controller 1. The controller 1 determines the number of internal machines participating in the operation of the air conditioner in the operation process of the air conditioner; judging whether the quantity changes in the process of continuously operating the air conditioner for a preset time; under the condition that the quantity is not changed, the refrigerant of the air conditioner is controlled according to the superheat degree control method; and controlling the refrigerant of the air conditioner according to the average temperature control method under the condition that the quantity is changed. The refrigerant of the air conditioner is controlled according to the superheat degree control method or the average temperature control method according to whether the number of the indoor units participating in operation changes within the preset time of continuous operation of the air conditioner, rather than the refrigerant of the air conditioner is controlled only by the superheat degree control method or the average temperature control method, the superheat degree control method can fully utilize the efficiency of the heat exchangers of the indoor units, and the average temperature control method can give consideration to the refrigerant distribution among the indoor units, so that the efficiency of the heat exchangers of the indoor units can be fully utilized, and the refrigerant distribution among the indoor units can be considered. Further, the controller 1 is also configured to control the refrigerant of the air conditioner according to the average temperature control method before the number is determined.
fig. 8 is a block diagram illustrating an apparatus for controlling a refrigerant of an air conditioner according to another embodiment of the present invention. As shown in fig. 8, the apparatus includes a controller 1 and a first temperature sensor 2. The first temperature sensor 2 is used to detect the outlet temperature of the evaporator corresponding to each of the internal machines participating in operation during the operation of the air conditioner. The controller 1 calculates the average value of the outlet temperature of the evaporator according to the detected outlet temperature of the evaporator and the number of the internal machines participating in operation; and adjusting the opening degree of the electronic expansion valve corresponding to each evaporator according to the outlet temperature of the evaporator and the average value of the outlet temperatures of the evaporators.
specifically, the controller 1 is configured to adjust the opening degree of the electronic expansion valve corresponding to each evaporator according to the outlet temperature of the evaporator and the average value of the evaporator outlet temperatures by: calculating the difference value of the outlet temperature of each evaporator and the average value of the outlet temperatures of the evaporators; and at least one of: maintaining an opening degree of an electronic expansion valve corresponding to the evaporator in a case where an absolute value of the difference is less than or equal to a predetermined value; in the case that the difference is greater than the predetermined value, increasing the opening degree of the electronic expansion valve corresponding to the evaporator, such as increasing the electronic expansion valve B P; and decreasing B P the opening degree of the electronic expansion valve corresponding to the evaporator in the case where the difference is smaller than the opposite of the predetermined value. Where P is the unit of opening, step. In general, B has a value in the range of 16 to 32. The predetermined value can be selected according to the requirements of users, and the value of the predetermined value is generally between 0.5 and 2 ℃. The inverse value is the inverse of the predetermined value, for example, if the predetermined value is 1, the inverse value is-1.
Fig. 9 is a block diagram illustrating an apparatus for controlling a refrigerant of an air conditioner according to another embodiment of the present invention. As shown in fig. 9, the apparatus includes a controller 1, a first temperature sensor 3, and a second temperature sensor 4. The first temperature sensor 3 is used to detect the outlet temperature of the evaporator corresponding to each of the internal machines participating in operation in the air conditioning operation. The second temperature sensor 4 is used to detect the inlet temperature of the shunt capillary in the evaporator. The controller 1 calculates the difference between the outlet temperature and the inlet temperature; and adjusting the opening degree of the electronic expansion valve corresponding to the evaporator according to the relation between the difference value and the preset range. Wherein the difference is the degree of superheat. In this embodiment, the second temperature sensor 4 may comprise only one temperature sensor, i.e. only detect the inlet temperature of a certain branch capillary in the evaporator. The controller 1 calculates a difference between an inlet temperature of the branch capillary and an outlet temperature of the evaporator and adjusts an opening degree of an electronic expansion valve corresponding to the evaporator according to a relation between the difference and a predetermined range. In addition, the second temperature sensor 4 may further include a plurality of temperature sensors for detecting the inlet temperature of the multi-channel capillary. The controller 1 calculates a temperature average value of the inlet temperature of the multi-path branching capillary tube, calculates a difference value between the temperature average value and the outlet temperature of the evaporator, and adjusts the opening degree of the electronic expansion valve corresponding to the evaporator according to a relation between the difference value between the temperature average value and the outlet temperature of the evaporator and a predetermined range so that the difference value falls within the predetermined range. Wherein when the degree of superheat (i.e., the difference between the average temperature and the evaporator outlet temperature) is within the predetermined range, the opening degree of the electronic expansion valve at that time is kept constant. In addition, the predetermined range may be selected according to user requirements, as shown in FIG. 5, between c1 and b1, and specifically, may be 3-5. In fig. 5, the vertical axis represents the degree of superheat, i.e., the above difference (the difference between the inlet temperature of a certain bypass capillary and the outlet temperature of the evaporator or the difference between the average value of the inlet temperatures of the multiple bypass capillaries and the outlet temperature of the evaporator), the arrow indicates an increase or decrease in the degree of superheat, the arrow indicates an increase in the degree of superheat, and the arrow indicates a decrease in the degree of superheat. When the degree of superheat is less than d1, the opening degree of the electronic expansion valve is decreased, see fig. 5, by B P. When the degree of superheat is between d1 and c1, the opening degree of the electronic expansion valve is decreased, as shown in fig. 5, A P is decreased. When the degree of superheat is between c1 and b1, the opening degree of the electronic expansion valve is maintained. When the degree of superheat is between b1 and a1, the opening degree of the electronic expansion valve is increased, as shown in fig. 5, A P is increased. When the degree of superheat exceeds a1, the opening degree of the electronic expansion valve is increased, B P as shown in fig. 5. In order to make the degree of superheat fall within a predetermined range as quickly as possible during actual operation, the correspondence between the range of the degree of superheat and the degree of adjustment of the opening degree of the electronic expansion valve may be slightly adjusted. As shown in fig. 5, when the degree of superheat is greater than a2, the degree of adjustment for the opening degree of the electronic expansion valve is increased B P as is the case when the degree of superheat is greater than a 1. When the degree of superheat is b2 to a2, the degree of adjustment of the opening degree of the electronic expansion valve is the same as when the degree of superheat is b1 to a 1. When the degree of superheat is in the range of c2 to b2, the degree of adjustment for the opening degree of the electronic expansion valve is the same as when the degree of superheat is in the range of c1 to b1, i.e., the current opening degree of the electronic expansion valve is maintained constant. When the degree of superheat is d2 to c2, the degree of adjustment of the opening degree of the electronic expansion valve is the same as when the degree of superheat is d1 to c 1. When the degree of superheat is less than d2, the degree of adjustment for the opening degree of the electronic expansion valve is the same as when the degree of superheat is less than d 1. In fig. 6, specific values are given to a1, b1, c1, d1, a2, b2, c2, and d2, where a1 is 10, b1 is 5, c1 is 3d1 is 0, a2 is 9, b2 is 4, c2 is 2, and d2 is-1. The following explains how, with reference to an example, the degree of superheat falls within a range in which the opening degree of the electronic expansion valve is kept constant as soon as possible after the above adjustment. Assuming that the degree of superheat is 15 before adjustment, the opening degree of the electronic expansion valve is increased B P within a range larger than 10, assuming that the degree of superheat is 9 after adjustment of the electronic expansion valve, the opening degree of the electronic expansion valve should be increased A P according to the correspondence between the range of the degree of superheat and the adjustment degree of the electronic expansion valve before adjustment, and the opening degree of the electronic expansion valve should be increased B P according to the correspondence after adjustment, whereas B is larger than a, it can be understood that the degree of superheat falls within a range of 3-5 as soon as possible by increasing B P of the electronic expansion valve to AP. In addition, through the adjustment, the range of the superheat degree for keeping the opening degree of the electronic expansion valve unchanged is also adjusted, and when the superheat degree is between 2 and 4, the opening degree of the electronic expansion valve is also kept unchanged, so that the superheat degree can fall into the range corresponding to the unchanged opening degree of the electronic expansion valve as soon as possible.
In addition, another aspect of the embodiments of the present invention provides an air conditioner. The air conditioner comprises the device in the embodiment.
In summary, the number of the internal machines participating in the operation of the air conditioner in the operation process is determined, the refrigerant of the air conditioner is controlled according to the superheat degree control method or the average temperature control method according to whether the number of the internal machines changes within the preset time of the continuous operation of the air conditioner, rather than the refrigerant of the air conditioner is controlled by only adopting the superheat degree control method or the average temperature control method, the superheat degree control method can fully utilize the efficiency of the heat exchangers of the internal machines, and the average temperature control method can give consideration to the refrigerant distribution among the internal machines, so that the efficiency of the heat exchangers of the internal machines can be fully utilized, and the refrigerant distribution among the internal machines can be considered.
although the embodiments of the present invention have been described in detail with reference to the accompanying drawings, the embodiments of the present invention are not limited to the details of the above embodiments, and various simple modifications can be made to the technical solutions of the embodiments of the present invention within the technical idea of the embodiments of the present invention, and these simple modifications all belong to the protection scope of the embodiments of the present invention.
It should be noted that the various features described in the above embodiments may be combined in any suitable manner without departing from the scope of the invention. In order to avoid unnecessary repetition, the embodiments of the present invention do not describe every possible combination.
those skilled in the art can understand that all or part of the steps in the method for implementing the above embodiments may be implemented by a program instructing related hardware, where the program is stored in a storage medium and includes several instructions to enable a (may be a single chip, a chip, etc.) or a processor (processor) to execute all or part of the steps of the method described in the embodiments of the present application. And the aforementioned storage medium includes: a U-disk, a removable hard disk, a Read-only Memory (ROM), a Random Access Memory (RAM), a magnetic disk or an optical disk, and other various media capable of storing program codes.
In addition, any combination of various different implementation manners of the embodiments of the present invention is also possible, and the embodiments of the present invention should be considered as disclosed in the embodiments of the present invention as long as the combination does not depart from the spirit of the embodiments of the present invention.
Claims (11)
1. A method for controlling a refrigerant of an air conditioner, the method comprising:
determining the number of the internal machines participating in operation in the air conditioner in the operation process of the air conditioner;
judging whether the quantity is changed in the process of continuously operating the air conditioner for a preset time;
under the condition that the quantity is not changed, controlling a refrigerant of the air conditioner according to a superheat degree control method; and
And controlling the refrigerant of the air conditioner according to an average temperature control method when the number is changed.
2. The method of claim 1, further comprising:
And before the quantity is determined, controlling the refrigerant of the air conditioner according to the average temperature control method.
3. The method according to claim 1 or 2, wherein the average temperature control method comprises:
detecting an outlet temperature of an evaporator corresponding to each of the internal machines;
Calculating an average value of the outlet temperatures of the evaporators according to the detected outlet temperatures of the evaporators and the number; and
And adjusting the opening degree of the electronic expansion valve corresponding to each evaporator according to the outlet temperature of the evaporator and the average value of the outlet temperatures of the evaporators.
4. the method of claim 3, wherein adjusting the opening degree of the electronic expansion valve corresponding to each evaporator based on the outlet temperature of the evaporator and the average of the evaporator outlet temperatures comprises:
calculating a difference between the outlet temperature of each evaporator and the average of the evaporator outlet temperatures; and
at least one of:
Maintaining an opening degree of an electronic expansion valve corresponding to the evaporator in a case where an absolute value of the difference is less than or equal to a predetermined value;
increasing the opening degree of an electronic expansion valve corresponding to the evaporator when the difference is larger than the predetermined value; and
and reducing the opening degree of the electronic expansion valve corresponding to the evaporator when the difference is smaller than the opposite value of the predetermined value.
5. The method according to claim 1 or 2, wherein the superheat controlling method includes:
Detecting an outlet temperature of an evaporator corresponding to each of the internal machines;
Detecting an inlet temperature of a shunt capillary in the evaporator;
Calculating a difference between the outlet temperature and the inlet temperature; and
And adjusting the opening degree of the electronic expansion valve corresponding to the evaporator according to the relation between the difference value and the preset range.
6. an apparatus for controlling a refrigerant of an air conditioner, comprising:
A controller to:
determining the number of the internal machines participating in operation in the air conditioner in the operation process of the air conditioner;
judging whether the quantity is changed in the process of continuously operating the air conditioner for a preset time;
under the condition that the quantity is not changed, controlling a refrigerant of the air conditioner according to a superheat degree control method; and
And controlling the refrigerant of the air conditioner according to an average temperature control method when the number is changed.
7. the apparatus of claim 6, wherein the controller is further configured to control the refrigerant of the air conditioner according to the average temperature control method before determining the amount.
8. the apparatus of claim 6 or 7, further comprising: a first temperature sensor for detecting an outlet temperature of the evaporator corresponding to each of the indoor units;
the controller is further configured to:
Calculating an average value of the outlet temperatures of the evaporators according to the detected outlet temperatures of the evaporators and the number; and
and adjusting the opening degree of the electronic expansion valve corresponding to each evaporator according to the outlet temperature of the evaporator and the average value of the outlet temperatures of the evaporators.
9. The apparatus of claim 8, wherein the controller is configured to adjust an opening degree of an electronic expansion valve corresponding to each evaporator according to an outlet temperature of the evaporator and an average of the outlet temperatures of the evaporators by:
Calculating the difference between the outlet temperature of each evaporator and the average value of the outlet temperatures of the evaporators; and
At least one of:
maintaining an opening degree of an electronic expansion valve corresponding to the evaporator in a case where an absolute value of the difference is less than or equal to a predetermined value;
increasing the opening degree of an electronic expansion valve corresponding to the evaporator when the difference is larger than the predetermined value; and
and reducing the opening degree of the electronic expansion valve corresponding to the evaporator when the difference is smaller than the opposite value of the predetermined value.
10. The apparatus of claim 6 or 7, further comprising:
a first temperature sensor for detecting an outlet temperature of the evaporator corresponding to each of the indoor units; and
a second temperature sensor for detecting an inlet temperature of a bypass capillary in the evaporator;
the controller is further configured to:
Calculating a difference between the outlet temperature and the inlet temperature; and
And adjusting the opening degree of the electronic expansion valve corresponding to the evaporator according to the relation between the difference value and the preset range.
11. An air conditioner, characterized in that it comprises a device according to any one of claims 6-10.
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| CN109114803A (en) * | 2018-08-31 | 2019-01-01 | 广东志高暖通设备股份有限公司 | A kind of control method of refrigerant flow of air-source heat-pump air heater and its system |
| CN110425781B (en) * | 2019-08-09 | 2021-10-26 | 宁波奥克斯电气股份有限公司 | Evaporator flow path outlet temperature adjusting method and device and air conditioner |
| CN111520869B (en) * | 2020-05-25 | 2022-07-19 | 广东开利暖通空调股份有限公司 | Accurate refrigerant distribution control method for indoor unit of multi-split system |
| CN112304152B (en) * | 2020-10-26 | 2023-01-20 | 广东Tcl智能暖通设备有限公司 | Heat exchange system control method, device, equipment, system and storage medium |
| CN112797599B (en) * | 2020-12-30 | 2022-08-16 | 宁波奥克斯电气股份有限公司 | Multi-split air conditioner electronic expansion valve opening control method, adjusting device and air conditioner system |
| CN113654280B (en) * | 2021-08-06 | 2022-09-16 | 佛山市顺德区美的电子科技有限公司 | Control method and control device for electronic expansion valve of air conditioner, air conditioner and medium |
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