CN107975920B - Expansion valve control method and multi-split system - Google Patents
Expansion valve control method and multi-split system Download PDFInfo
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- CN107975920B CN107975920B CN201711202728.2A CN201711202728A CN107975920B CN 107975920 B CN107975920 B CN 107975920B CN 201711202728 A CN201711202728 A CN 201711202728A CN 107975920 B CN107975920 B CN 107975920B
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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
- F25B2600/00—Control issues
- F25B2600/25—Control of valves
- F25B2600/2513—Expansion valves
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Abstract
The embodiment of the invention provides an expansion valve control method and a multi-split system, and relates to the technical field of expansion valves. Wherein the method comprises the following steps: detecting the liquid pipe temperature of each liquid pipe according to a preset time period; when the current opening information of at least one expansion valve is the minimum opening, comparing the liquid pipe temperature corresponding to the expansion valve with the minimum opening with the average liquid pipe temperature to obtain a comparison result corresponding to each expansion valve; and regulating and controlling the minimum step number of the corresponding expansion valve according to the comparison result. And judging the expansion valve needing to adjust the minimum opening degree in the multi-split system through the process, and performing corresponding regulation and control. The expansion valve is not limited in the process of adjusting the opening degree in real time, and meanwhile, the normal work of the multi-split system cannot be influenced by the adjustment of the minimum opening degree. The high regulation and control sensitivity is ensured, and the real-time opening degree regulation effect of the expansion valve in the multi-split system is improved.
Description
Technical Field
The invention relates to the technical field of expansion valves, in particular to an expansion valve control method and a multi-split system.
Background
The expansion valve plays a very important role in the process of realizing refrigeration or heating of the temperature regulation system. An expansion valve is typically installed between the reservoir and the evaporator to effect the conversion of the liquid at intermediate temperature and high pressure into wet vapor at low temperature and low pressure. The ideal expansion valve operating state should be to control the flow rate by changing the opening degree in real time with the change of the evaporator load.
However, the inventor of the present application has observed that, in the related art, although accurate control of the real-time opening degree can be theoretically achieved, the application effect in the temperature control system of the multi-split mode, which is currently more mainstream, is not good. This is mainly because the opening range of the expansion valve in the temperature control system in the multi-split air-conditioning mode is usually fixed, and therefore, in some specific cases (for example, when the number of steps corresponding to the real-time opening degree is already controlled to the minimum number of steps corresponding to the minimum opening degree corresponding to the opening range), the real-time opening degree control may fail. Meanwhile, the temperature control system in the multi-split air conditioner form has high requirements on the opening range, in the refrigerating process, if the minimum step number selection value corresponding to the minimum opening corresponding to the opening range is larger, the system has a liquid return risk, and if the minimum step number selection value corresponding to the minimum opening corresponding to the opening range is smaller, the electronic expansion valve is easy to close; in the heating process, if the minimum step number selection value corresponding to the minimum opening corresponding to the opening range is larger, the refrigerant stays too little in the internal machine, which may cause the circulation amount of the system refrigerant to be larger, and if the minimum step number corresponding to the minimum opening corresponding to the opening range is smaller, the refrigerant stays too much in the internal machine, which may cause the circulation amount of the system refrigerant to be smaller.
Therefore, the development of an expansion valve control method capable of effectively solving the above problems is a technical problem which needs to be solved urgently at present.
Disclosure of Invention
In view of the above, the present invention is directed to a method for controlling an expansion valve, so as to solve the problem of poor real-time opening degree adjustment effect of the expansion valve in a temperature control system of a multi-split system.
In order to achieve the purpose, the technical scheme of the invention is realized as follows:
an expansion valve control method is applied to a multi-split system, the multi-split system comprises a plurality of expansion valves and liquid pipes connected with the expansion valves, and the method comprises the following steps: detecting the liquid pipe temperature of each liquid pipe according to a preset time period; acquiring current opening information of the expansion valve; when the current opening information of at least one expansion valve is the minimum opening, generating an average liquid pipe temperature according to the detected liquid pipe temperature; comparing the liquid pipe temperature corresponding to the expansion valve with the minimum opening degree according to the current opening degree information with the average liquid pipe temperature to obtain a comparison result corresponding to each expansion valve; and regulating and controlling the minimum step number of the corresponding expansion valve according to the comparison result.
Furthermore, the multi-split air-conditioning system comprises a multi-split air-conditioning system, the multi-split air-conditioning system comprises a plurality of indoor units connected with an outdoor unit, and each indoor unit comprises one expansion valve; the method also comprises the steps of detecting the air pipe temperature of each indoor unit and the corresponding operating environment temperature of each indoor unit; the step of regulating and controlling the minimum step number of the corresponding expansion valve according to the comparison result comprises the following steps: and regulating and controlling the corresponding minimum step number of the expansion valve according to the comparison result, the corresponding air pipe temperature and the corresponding operating environment temperature.
Further, when the indoor unit is in a cooling mode, the step of adjusting and controlling the minimum step number of the corresponding expansion valve according to the comparison result, the air pipe temperature and the operating environment temperature includes: generating a second temperature value according to the operating environment temperature and a preset first temperature value; when the comparison result corresponding to the expansion valve meets a first requirement and the temperature of the liquid pipe is greater than or equal to the second temperature value, adjusting the minimum step number of the expansion valve according to a preset up-regulation step number so as to improve the minimum step number of the expansion valve; and when the comparison result corresponding to the expansion valve meets a second requirement and the temperature of the liquid pipe is greater than or equal to the temperature of the air pipe, adjusting the minimum step number of the expansion valve according to a preset down-regulation step number so as to reduce the minimum step number of the expansion valve.
Further, when the indoor unit is in a heating mode, the step of adjusting and controlling the minimum number of steps of the corresponding expansion valve according to the comparison result, the air pipe temperature and the operating environment temperature includes: generating a third temperature value according to the operating environment temperature and a preset first temperature value; and when the comparison result corresponding to the expansion valve meets a third requirement and the temperature of the liquid pipe is less than or equal to the third temperature value, adjusting the minimum step number of the expansion valve according to a preset up-regulation step number so as to improve the minimum step number of the expansion valve.
Compared with the prior art, the expansion valve control method has the following advantages:
(1) according to the expansion valve control method, the liquid pipe temperature of each liquid pipe is periodically detected, when the current opening information of at least one expansion valve is the minimum opening, the liquid pipe temperature corresponding to the expansion valve with the minimum opening information is compared with the current average liquid pipe temperature, and the minimum opening of the corresponding expansion valve is regulated and controlled according to the comparison result, so that the expansion valve needing to be regulated in the minimum opening in the multi-split system can be judged and regulated correspondingly. The normal work of the multi-split system cannot be influenced by the adjustment of the minimum opening degree while the expansion valve is not limited in the process of adjusting the opening degree in real time. The high regulation and control sensitivity is ensured, and the real-time opening degree regulation effect of the expansion valve in the multi-split system is improved.
(2) According to the expansion valve control method, the corresponding minimum step number of the expansion valve is regulated and controlled according to the comparison result, the corresponding air pipe temperature and the corresponding operating environment temperature, so that the accuracy of judging the expansion valve needing to be controlled in the multi-split system is improved, and the regulation and control accuracy is improved.
(3) The control method of the expansion valve further comprises the steps of generating a second temperature value according to the operating environment temperature and a preset first temperature value when the indoor unit is in a refrigeration mode, and adjusting the minimum step number of the expansion valve according to a preset up-regulation step number when a comparison result corresponding to the expansion valve meets a first requirement and the temperature of the liquid pipe is greater than or equal to the second temperature value. And when the comparison result corresponding to the expansion valve meets a second requirement and the temperature of the liquid pipe is greater than or equal to the temperature of the air pipe, adjusting the minimum step number of the expansion valve according to a preset down-regulation step number so as to reduce the minimum step number of the expansion valve. The minimum step number of the expansion valve can be adjusted to meet the requirement of a refrigeration mode on the opening range of the expansion valve, and the adjustment and the control are more accurate.
(4) The control method of the expansion valve further comprises the steps of generating a third temperature value according to the operating environment temperature and a preset first temperature value when the indoor unit is in a heating mode; and when the comparison result corresponding to the expansion valve meets a third requirement and the temperature of the liquid pipe is less than or equal to the third temperature value, adjusting the minimum step number of the expansion valve according to a preset up-regulation step number so as to improve the minimum step number of the expansion valve. The minimum step number of the expansion valve can be adjusted to meet the requirement of a heating mode on the opening range of the expansion valve, and the adjustment and control are more accurate.
Another objective of the present invention is to provide a multi-split system to solve the problem that the real-time opening degree adjustment effect of the expansion valve in the multi-split mode temperature control system is not good.
In order to achieve the purpose, the technical scheme of the invention is realized as follows:
a multi-online system comprises a plurality of expansion valves, liquid pipes connected with the expansion valves, a first temperature sensor arranged on each liquid pipe and a controller, wherein the controller is electrically connected with the first temperature sensors and the expansion valves respectively; the first temperature sensor is used for detecting the liquid pipe temperature of each liquid pipe according to a preset time period; the controller is used for acquiring the current opening information of the expansion valve; the controller is further configured to generate an average liquid pipe temperature according to each detected liquid pipe temperature when the current opening information of at least one expansion valve is a minimum opening; the controller is further configured to compare the liquid pipe temperature corresponding to the expansion valve whose current opening information is the minimum opening with the average liquid pipe temperature to obtain a comparison result corresponding to each expansion valve; and the controller is also used for regulating and controlling the corresponding minimum step number of the expansion valve according to the comparison result.
Compared with the prior art, the advantages of the multi-split system and the expansion valve control method are the same, and are not described herein again.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate an embodiment of the invention and, together with the description, serve to explain the invention and not to limit the invention. In the drawings:
fig. 1 is a schematic structural diagram of a multi-split system according to an embodiment of the present invention;
FIG. 2 is a flowchart illustrating steps of a method for controlling an expansion valve according to an embodiment of the present invention;
FIG. 3 is a portion of a flow chart of sub-steps of step S107 of FIG. 2;
FIG. 4 is another portion of a flowchart illustrating sub-steps of step S107 of FIG. 2;
fig. 5 is another part of a schematic structural diagram of a multi-split system according to an embodiment of the present invention.
Icon: 1-a multi-split system; 2-an indoor unit; 3-an expansion valve; 4-a liquid tube; 5-an evaporator; 6-trachea; 7-an outdoor unit; 8-a controller; 9-a first temperature sensor; 10-a second temperature sensor; 11-third temperature sensor.
Detailed Description
It should be noted that the embodiments and features of the embodiments may be combined with each other without conflict.
In addition, as shown in fig. 1, the multi-split air conditioning system 1 according to the embodiment of the present invention may be a multi-split air conditioning system including one outdoor unit 7 and a plurality of indoor units 2 connected thereto by pipes. Each indoor unit 2 comprises an expansion valve 3, a liquid pipe 4, an evaporator 5 and an air pipe 6 which are connected in sequence. Of course, the multi-split air-source water heater system 1 may also be other temperature regulation systems including the expansion valve 3, for example, a multi-split air-source water heater system. In the embodiment of the present invention, a multi-split air conditioning system is described as an example.
The present invention will be described in detail below with reference to the embodiments with reference to the attached drawings.
First embodiment
Referring to fig. 2, fig. 2 shows a method for controlling an expansion valve 3 according to an embodiment of the present invention. The expansion valve 3 control method is applied to the multi-split system 1 shown in fig. 1. As shown in fig. 2, the expansion valve 3 control method includes:
step S101, detecting a liquid tube temperature of each of the liquid tubes 4.
In the embodiment of the present invention, the tube temperature of each of the liquid tubes 4 is detected for a preset time period. Specifically, the liquid pipe temperature of the surface of the liquid pipe 4 corresponding to each indoor unit 2 in the multi-split system 1 is detected in each time period. The above-mentioned detection process may be a synchronous detection of all the liquid tubes 4, or an asynchronous detection of the liquid tube temperature of each liquid tube 4 before the end of the time period.
Step S102, current opening degree information of the expansion valve 3 is acquired.
In the embodiment of the present invention, in the same preset time period, step S101 and step S102 are in a parallel relationship, and there is no absolute precedence relationship between the two steps. It can be understood that, in each preset time period, the liquid tube temperature corresponding to each liquid tube 4 and the current opening information of each expansion valve 3 are obtained once. The current opening degree information of the expansion valve 3 may be a real-time opening degree of the expansion valve 3 when it is collected. As an embodiment, after detecting the liquid tube temperature of one of the liquid tubes 4 in step S101, the current opening information of the expansion valve 3 corresponding to the liquid tube 4 may be acquired.
Step S103 is to determine whether the information on the current opening degree of the expansion valve 3 in the multi-split air conditioning system 1 is the minimum opening degree.
And step S104, when the current opening information of at least one expansion valve 3 is the minimum opening, generating an average liquid pipe temperature according to each detected liquid pipe temperature.
In the embodiment of the present invention, the minimum opening degree may be a minimum value of an opening degree range of the expansion valve 3. The opening degree range may be a range in which the valve of the expansion valve 3 can be freely adjusted. For example, if the opening degree of the expansion valve 3 ranges from 40 steps to 150 steps, the real-time opening degree of the expansion valve 3 can be adjusted in the interval between 40 steps and 150 steps according to the demand of the entire indoor unit 2, and 40 steps is the minimum number of steps of the minimum opening degree of the expansion valve 3. In a preset time period, when the current opening information of at least one expansion valve 3 in the multi-split system 1 is the minimum opening corresponding to the current opening range, all the liquid pipe temperatures obtained in the preset time period are subjected to operation processing to obtain an average liquid pipe temperature corresponding to the preset time period, and the process proceeds to step S105. If the current opening information of the expansion valve 3 is not the minimum opening in the period, the process is ended, and the process is resumed to step S101 after waiting for the next preset time period. Unnecessary processes are avoided, and unnecessary system load is also avoided.
Step S105, comparing the liquid pipe temperature corresponding to the expansion valve 3 whose current opening information is the minimum opening with the average liquid pipe temperature, so as to obtain a comparison result corresponding to each expansion valve 3.
In the present embodiment, each expansion valve 3 is followed by a corresponding liquid pipe 4. Thus, each expansion valve 3 corresponds to a pipe temperature. And comparing the liquid pipe temperature corresponding to the expansion valve 3 with the minimum opening degree of the current opening degree information with the average liquid pipe temperature, and judging whether the liquid pipe temperature corresponding to the expansion valve 3 exceeds the average liquid pipe temperature.
And step S106, detecting the air pipe temperature of each indoor unit 2 and the operating environment temperature corresponding to each indoor unit 2.
In the embodiment of the present invention, the operating environment temperature may be temperature information of a position where each indoor unit 2 is installed. For example, in a household multi-split air conditioning system, the operating environment temperature may be indoor temperature information of a room in which the indoor unit 2 is installed. The gas pipe temperature may be temperature information of the gas pipe 6 connected to the expansion valve 3 and the liquid pipe 4.
And S107, regulating and controlling the corresponding minimum step number of the expansion valve 3 according to the comparison result.
In the embodiment of the present invention, the minimum step number of the corresponding minimum opening degree of the expansion valve 3 may be adjusted and controlled according to the comparison result of the expansion valve 3, the corresponding air pipe temperature, and the corresponding operating environment temperature obtained in the above steps. In the minimum step number adjustment process of the minimum opening degree of the expansion valve 3, the adjustment may be performed according to the current operation mode (cooling mode or heating mode) of the indoor unit 2. As an embodiment, when operating in the cooling mode, as shown in fig. 3, step S107 may include the following sub-steps:
and a substep S1071 of generating a second temperature value according to the operating environment temperature and a preset first temperature value.
In the embodiment of the present invention, a value of the preset first temperature value may be between 2 degrees and 6 degrees. Preferably, the first temperature value is 4 degrees. Preferably, a difference value between the operating environment temperature and a preset first temperature value may be used as the second temperature value.
In the substep S1072, whether the comparison result corresponding to the expansion valve 3 satisfies the first requirement or the second requirement is determined.
The first requirement may be that the liquid-pipe temperature corresponding to each comparison result of the expansion valve 3 in a plurality of adjacent and consecutive preset time periods is greater than or equal to the average liquid-pipe temperature. As an embodiment, the first requirement may be that the comparison result corresponding to the expansion valve 3 in the current preset time period is that the corresponding liquid pipe temperature is greater than or equal to the average liquid pipe temperature, and the comparison result corresponding to the expansion valve 3 in the previous adjacent preset time period is that the corresponding liquid pipe temperature is greater than or equal to the average liquid pipe temperature.
The second requirement may be that the liquid-pipe temperature corresponding to each comparison result of the expansion valve 3 in a plurality of adjacent and consecutive preset time periods is less than the average liquid-pipe temperature. As an embodiment, the second requirement may be that the expansion valve 3 corresponds to a comparison result that the corresponding liquid pipe temperature is less than the average liquid pipe temperature in the current preset time period, and the expansion valve 3 corresponds to a comparison result that the corresponding liquid pipe temperature is less than the average liquid pipe temperature in the previous adjacent preset time period.
In the embodiment of the present invention, when the comparison result corresponding to the expansion valve 3 meets the first requirement, the process proceeds to substep S1073; when the comparison result corresponding to the expansion valve 3 satisfies the second requirement, the process proceeds to substep S1074.
The substep S1073 is to adjust the minimum step number of the expansion valve 3 according to a predetermined up-regulation step number to increase the minimum step number of the expansion valve 3.
The predetermined number of up-regulation steps may be any value between 1 step and 6 steps. Preferably, the predetermined number of up-regulation steps is 3 steps.
In the embodiment of the present invention, before the minimum step number of the minimum opening degree of the expansion valve 3 is increased each time, the current minimum opening degree is compared with the preset first limit value of the minimum opening degree, and if the current minimum opening degree is equal to the first limit value, the minimum step number corresponding to the minimum opening degree is not increased any more to maintain the current situation. The first limit value may be any value between 100 steps and 140 steps. Preferably, the first limit value may be 120 steps.
The substep S1074 of adjusting the minimum number of steps of the expansion valve 3 according to a predetermined number of down-regulation steps to reduce the minimum number of steps of the expansion valve 3.
The predetermined number of downward adjustment steps may be any value between 1 step and 6 steps. Preferably, the predetermined number of downshifting steps is 3 steps.
In the embodiment of the present invention, before the minimum step number of the minimum opening degree of the expansion valve 3 is adjusted downward each time, the current minimum opening degree is compared with the preset second limit value of the minimum opening degree, and if the current minimum opening degree is equal to the second limit value, the minimum step number corresponding to the minimum opening degree is not adjusted downward any more to maintain the current situation. The second limit value may be any value between 40 steps and 90 steps. Preferably, the second limit value may be 70 steps.
As an embodiment, when operating in the heating mode, as shown in fig. 4, step S106 may include the following sub-steps:
and a substep S1075 of generating a third temperature value according to the operating environment temperature and a preset first temperature value.
The value of the preset first temperature value can be between 2 degrees and 6 degrees. Preferably, the first temperature value is 4 degrees. Preferably, the sum of the operating environment temperature and the preset first temperature value may be used as the third temperature value.
And a substep S1076, adjusting the minimum step number of the expansion valve 3 according to a predetermined up-regulation step number to increase the minimum step number of the expansion valve 3 when the comparison result corresponding to the expansion valve 3 meets a third requirement and the liquid pipe temperature is less than or equal to the third temperature value.
The third requirement may be that the liquid-pipe temperature corresponding to each comparison result of the expansion valve 3 in a plurality of adjacent and consecutive preset time periods is less than or equal to the average liquid-pipe temperature. As an embodiment, the third requirement may be that the comparison result corresponding to the expansion valve 3 in the current preset time period is that the corresponding liquid pipe temperature is less than or equal to the average liquid pipe temperature, and the comparison result corresponding to the expansion valve 3 in the previous adjacent preset time period is that the corresponding liquid pipe temperature is less than or equal to the average liquid pipe temperature.
Second embodiment
Referring to fig. 5, fig. 5 shows another part of the schematic diagram of the multi-split system 1 according to the embodiment of the invention. The multiple split air-conditioning system 1 further comprises a first temperature sensor 9, a second temperature sensor 10, a third temperature sensor 11 and a controller 8. The controller 8 is electrically connected to the first temperature sensor 9, the second temperature sensor 10, the third temperature sensor 11, and the expansion valve 3, respectively.
In one embodiment, the first temperature sensor 9 may be disposed on each liquid pipe 4 of each indoor unit 2, and is configured to collect a liquid pipe temperature of each liquid pipe 4 of each indoor unit 2. The second temperature sensors 10 may be respectively disposed on the air pipes 6 of each indoor unit 2, and are configured to collect the air pipe temperature of each indoor unit 2. The third temperature sensors 11 are respectively disposed on the casing of each indoor unit 2, and are configured to collect an operating environment temperature of each indoor unit 2. Specifically, the method comprises the following steps:
the first temperature sensor 9 is configured to detect a tube temperature of each of the liquid tubes 4 according to a preset time period.
And the controller 8 is configured to obtain current opening information of the expansion valve 3.
The controller 8 is further configured to generate an average liquid pipe temperature according to each detected liquid pipe temperature when the current opening information of at least one of the expansion valves 3 is the minimum opening.
The controller 8 is further configured to compare the liquid pipe temperature corresponding to the expansion valve 3 with the minimum opening degree according to the current opening degree information with the average liquid pipe temperature, so as to obtain a comparison result corresponding to each expansion valve 3.
The second temperature sensor 10 is configured to detect an air pipe temperature of each indoor unit 2.
And the third temperature sensor 11 is configured to detect an operating environment temperature corresponding to each indoor unit 2.
The controller 8 is further configured to regulate and control the corresponding minimum step number of the expansion valve 3 according to the comparison result.
In an embodiment of the present invention, the controller 8 may perform the adjustment and control of the corresponding minimum step number of the expansion valve 3 according to the comparison result, where the adjustment and control of the corresponding minimum step number of the expansion valve 3 may be performed according to the comparison result, the corresponding air pipe temperature, and the corresponding operating environment temperature. Optionally, if the indoor unit 2 is in the cooling mode, the controller 8 is further configured to generate a second temperature value according to the operating environment temperature and a preset first temperature value; when the comparison result corresponding to the expansion valve 3 meets a first requirement and the liquid pipe temperature is greater than or equal to the second temperature value, adjusting the minimum step number of the expansion valve 3 according to a preset up-regulation step number to increase the minimum step number of the expansion valve 3, wherein the first requirement is that the comparison results corresponding to the expansion valve 3 in a plurality of continuous preset time periods are all that the corresponding liquid pipe temperature is greater than or equal to the average liquid pipe temperature; and when the comparison result corresponding to the expansion valve 3 meets a second requirement and the liquid pipe temperature is greater than or equal to the gas pipe temperature, adjusting the minimum step number of the expansion valve 3 according to a preset down-regulation step number to reduce the minimum step number of the expansion valve 3, wherein the second requirement is that the comparison results corresponding to the expansion valve 3 in a plurality of continuous preset time periods are all that the corresponding liquid pipe temperature is less than the average liquid pipe temperature.
If the indoor unit 2 is in the heating mode, the controller 8 is further configured to generate a third temperature value according to the operating environment temperature and a preset first temperature value; and when the comparison result corresponding to the expansion valve 3 meets a third requirement and the liquid pipe temperature is less than or equal to the third temperature value, adjusting the minimum step number of the expansion valve 3 according to a preset up-regulation step number so as to improve the minimum step number of the expansion valve 3.
It can be clearly understood by those skilled in the art that, for convenience and brevity of description, the specific working process of the multi-split system 1 described above may refer to the corresponding process in the foregoing method embodiment, and is not described herein again.
In summary, the method for controlling an expansion valve according to the embodiments of the present invention is applied to a multi-split system. The multi-split air conditioning system comprises a plurality of expansion valves and liquid pipes connected with the expansion valves, and the method comprises the following steps: detecting the liquid pipe temperature of each liquid pipe according to a preset time period; acquiring current opening information of the expansion valve; when the current opening information of at least one expansion valve is the minimum opening, generating an average liquid pipe temperature according to the detected liquid pipe temperature; comparing the liquid pipe temperature corresponding to the expansion valve with the minimum opening degree according to the current opening degree information with the average liquid pipe temperature to obtain a comparison result corresponding to each expansion valve; and regulating and controlling the minimum step number of the corresponding expansion valve according to the comparison result. And judging the expansion valve needing to adjust the minimum opening degree in the multi-split system through the process, and performing corresponding regulation and control. The normal work of the multi-split system cannot be influenced by the adjustment of the minimum opening degree while the expansion valve is not limited in the process of adjusting the opening degree in real time. The high regulation and control sensitivity is ensured, and the real-time opening degree regulation effect of the expansion valve in the multi-split system is improved.
In the embodiments provided in the present application, it should be understood that the disclosed apparatus and method can be implemented in other ways. The apparatus embodiments described above are merely illustrative, and for example, the flowchart and block diagrams in the figures illustrate the architecture, functionality, and operation of possible implementations of apparatus, methods and computer program products according to various embodiments of the present invention. In this regard, each block in the flowchart or block diagrams may represent a module, segment, or portion of code, which comprises one or more executable instructions for implementing the specified logical function(s). It should also be noted that, in some alternative implementations, the functions noted in the block may occur out of the order noted in the figures. For example, two blocks shown in succession may, in fact, be executed substantially concurrently, or the blocks may sometimes be executed in the reverse order, depending upon the functionality involved. It will also be noted that each block of the block diagrams and/or flowchart illustration, and combinations of blocks in the block diagrams and/or flowchart illustration, can be implemented by special purpose hardware-based systems which perform the specified functions or acts, or combinations of special purpose hardware and computer instructions.
In addition, the functional modules in the embodiments of the present invention may be integrated together to form an independent part, or each module may exist separately, or two or more modules may be integrated to form an independent part.
The functions, if implemented in the form of software functional modules and sold or used as a stand-alone product, may be stored in a computer readable storage medium. Based on such understanding, the technical solution of the present invention may be embodied in the form of a software product, which is stored in a storage medium and includes instructions for causing a computer device (which may be a personal computer, a server, or a network device) to execute all or part of the steps of the method according to the embodiments of the present invention. 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.
It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, 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 process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
Claims (8)
1. An expansion valve control method is characterized in that the method is applied to a multi-split air-conditioning system (1), the multi-split air-conditioning system (1) comprises a plurality of expansion valves (3) and liquid pipes (4) connected with the expansion valves (3), the multi-split air-conditioning system (1) comprises a multi-split air-conditioning system, the multi-split air-conditioning system comprises a plurality of indoor units (2) matched with outdoor units (7), and each indoor unit (2) comprises one expansion valve (3); the method comprises the following steps:
detecting the liquid pipe temperature of each liquid pipe (4) according to a preset time period;
acquiring current opening information of the expansion valve (3);
when the current opening information of at least one expansion valve (3) is the minimum opening, generating an average liquid pipe temperature according to each detected liquid pipe temperature;
comparing the liquid pipe temperature corresponding to the expansion valve (3) with the current opening information being the minimum opening with the average liquid pipe temperature to obtain a comparison result corresponding to each expansion valve (3);
regulating and controlling the corresponding minimum step number of the expansion valve (3) according to the comparison result, the corresponding air pipe temperature and the corresponding operating environment temperature; when the indoor unit (2) is in a refrigeration mode, the step of regulating and controlling the corresponding minimum step number of the expansion valve (3) according to the comparison result, the air pipe temperature and the operating environment temperature comprises the following steps: generating a second temperature value according to the operating environment temperature and a preset first temperature value; when the comparison result corresponding to the expansion valve (3) meets a first requirement and the liquid pipe temperature is greater than or equal to the second temperature value, adjusting the minimum step number of the expansion valve (3) according to a preset up-regulation step number so as to improve the minimum step number of the expansion valve (3); when the comparison result corresponding to the expansion valve (3) meets a second requirement and the liquid pipe temperature is greater than or equal to the air pipe temperature, adjusting the minimum step number of the expansion valve (3) according to a preset down-regulation step number so as to reduce the minimum step number of the expansion valve (3); the first requirement is that the liquid pipe temperature corresponding to each comparison result of the expansion valve (3) in a plurality of adjacent and continuous preset time periods is greater than or equal to the average liquid pipe temperature; the second requirement is that the liquid pipe temperature corresponding to the comparison results of the expansion valve (3) in a plurality of adjacent and continuous preset time periods is less than the average liquid pipe temperature.
2. The method of claim 1, further comprising: and detecting the air pipe temperature of each indoor unit (2) and the corresponding operating environment temperature of each indoor unit (2).
3. A method according to claim 1, wherein the first requirement is that the expansion valve (3) has a corresponding liquid-pipe temperature being greater than or equal to the mean liquid-pipe temperature for a plurality of consecutive predetermined time periods; the second requirement is that the corresponding comparison results of the expansion valve (3) are all that the corresponding liquid pipe temperature is less than the average liquid pipe temperature in a plurality of continuous preset time periods.
4. The method according to claim 1, wherein the step of controlling the corresponding minimum number of steps of the expansion valve (3) according to the comparison result, the air pipe temperature and the operating environment temperature when the indoor unit (2) is in the heating mode comprises:
generating a third temperature value according to the operating environment temperature and a preset first temperature value;
when the comparison result corresponding to the expansion valve (3) meets a third requirement and the liquid pipe temperature is less than or equal to the third temperature value, adjusting the minimum step number of the expansion valve (3) according to a preset up-regulation step number so as to improve the minimum step number of the expansion valve (3); the third requirement is that the liquid pipe temperature corresponding to the comparison results of the expansion valve (3) in a plurality of adjacent and continuous preset time periods is less than or equal to the average liquid pipe temperature.
5. A method according to claim 4, wherein the third requirement is that the expansion valve (3) has a corresponding liquid-pipe temperature being less than or equal to the mean liquid-pipe temperature for a number of consecutive predetermined time periods.
6. The multi-split system is characterized in that the multi-split system (1) comprises a plurality of expansion valves (3), liquid pipes (4) connected with the expansion valves (3), and first temperature sensors (9) and controllers (8) arranged on the liquid pipes (4), wherein the controllers (8) are electrically connected with the first temperature sensors (9) and the expansion valves (3) respectively; the multi-split air conditioning system (1) comprises a multi-split air conditioning system, the multi-split air conditioning system comprises a plurality of indoor units (2) matched with an outdoor unit (7), and each indoor unit (2) comprises one expansion valve (3);
the first temperature sensor (9) is used for detecting the liquid pipe temperature of each liquid pipe (4) according to a preset time period;
the controller (8) is used for acquiring the current opening information of the expansion valve (3);
the controller (8) is further configured to generate an average liquid pipe temperature according to each detected liquid pipe temperature when the current opening information of at least one expansion valve (3) is a minimum opening;
the controller (8) is further configured to compare the liquid pipe temperature corresponding to the expansion valve (3) with the minimum opening degree according to the current opening degree information with the average liquid pipe temperature, so as to obtain a comparison result corresponding to each expansion valve (3);
the controller (8) is further used for regulating and controlling the minimum step number of the corresponding expansion valve (3) according to the comparison result, the corresponding air pipe temperature and the corresponding operating environment temperature; when the indoor unit (2) is in a refrigeration mode, the controller (8) is further configured to generate a second temperature value according to the operating environment temperature and a preset first temperature value; when the comparison result corresponding to the expansion valve (3) meets a first requirement and the liquid pipe temperature is greater than or equal to the second temperature value, adjusting the minimum step number of the expansion valve (3) according to a preset up-regulation step number so as to improve the minimum step number of the expansion valve (3); when the comparison result corresponding to the expansion valve (3) meets a second requirement and the liquid pipe temperature is greater than or equal to the air pipe temperature, adjusting the minimum step number of the expansion valve (3) according to a preset down-regulation step number so as to reduce the minimum step number of the expansion valve (3); the first requirement is that the liquid pipe temperature corresponding to each comparison result of the expansion valve (3) in a plurality of adjacent and continuous preset time periods is greater than or equal to the average liquid pipe temperature; the second requirement is that the liquid pipe temperature corresponding to the comparison results of the expansion valve (3) in a plurality of adjacent and continuous preset time periods is less than the average liquid pipe temperature.
7. A multi-split system (1) as claimed in claim 6, wherein the multi-split system (1) comprises a multi-split air conditioning system, the multi-split air conditioning system comprises a plurality of indoor units (2) connected to an outdoor unit (7), each of the indoor units (2) comprises one of the expansion valves (3), a second temperature sensor (10) disposed on an air pipe (6) of each of the indoor units (2), and a third temperature sensor (11) disposed on a casing of each of the indoor units (2), and the second temperature sensor (10) and the third temperature sensor (11) are electrically connected to the controller (8);
the second temperature sensor (10) is used for detecting the air pipe temperature of each indoor unit (2);
and the third temperature sensor (11) is used for detecting the operating environment temperature corresponding to each indoor unit (2).
8. A multi-split system (1) as claimed in claim 7, wherein when said indoor unit (2) is in a heating mode, said controller (8) is further configured to:
generating a third temperature value according to the operating environment temperature and a preset first temperature value;
when the comparison result corresponding to the expansion valve (3) meets a third requirement and the liquid pipe temperature is less than or equal to the third temperature value, adjusting the minimum step number of the expansion valve (3) according to a preset up-regulation step number so as to improve the minimum step number of the expansion valve (3); the third requirement is that the liquid pipe temperature corresponding to the comparison results of the expansion valve (3) in a plurality of adjacent and continuous preset time periods is less than or equal to the average liquid pipe temperature.
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| CN108731313B (en) * | 2018-06-25 | 2020-07-31 | 宁波奥克斯电气股份有限公司 | Expansion valve control method and air conditioner |
| CN109059369B (en) * | 2018-08-13 | 2020-10-27 | 宁波奥克斯电气股份有限公司 | Control method of air conditioner, multi-split air conditioning system and air conditioner |
| CN115264783B (en) * | 2021-04-30 | 2023-11-28 | 芜湖美智空调设备有限公司 | Control method and device for multi-group pipe air conditioner, air conditioner and storage medium |
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