CN109297136B - Expansion valve blockage judging method and air conditioner - Google Patents
Expansion valve blockage judging method and air conditioner Download PDFInfo
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- CN109297136B CN109297136B CN201811355722.3A CN201811355722A CN109297136B CN 109297136 B CN109297136 B CN 109297136B CN 201811355722 A CN201811355722 A CN 201811355722A CN 109297136 B CN109297136 B CN 109297136B
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/30—Control or safety arrangements for purposes related to the operation of the system, e.g. for safety or monitoring
- F24F11/32—Responding to malfunctions or emergencies
- F24F11/38—Failure diagnosis
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/62—Control or safety arrangements characterised by the type of control or by internal processing, e.g. using fuzzy logic, adaptive control or estimation of values
- F24F11/63—Electronic processing
- F24F11/64—Electronic processing using pre-stored data
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Abstract
The invention provides an expansion valve blockage judging method and an air conditioner. The method for judging the blockage of the expansion valve comprises the following steps: acquiring the liquid pipe temperature, the air pipe temperature and the environment temperature of a specified indoor unit in the air conditioner in refrigerating operation; according to the liquid pipe temperature, the air pipe temperature and the environment temperature, and in combination with the opening information of the expansion valve of the specified indoor unit, judging the blockage type of the expansion valve to which the expansion valve of the specified indoor unit belongs; and displaying the blockage type of the expansion valve for overhauling. The method for judging the blockage of the expansion valve and the air conditioner can judge the blockage of the expansion valve and classify the blockage types according to the operation parameters of the air conditioner, so that a user can conveniently report and repair the blockage types, effective maintenance guide information can be provided for a maintainer, unnecessary disassembly is avoided, and the maintenance efficiency is improved.
Description
Technical Field
The invention relates to the technical field of air conditioners, in particular to an expansion valve blockage judging method and an air conditioner.
Background
The expansion valve is a commonly used throttling element of a temperature regulation system. In particular, with the development of expansion valve technology, electronic expansion valves having high control accuracy and stable performance have been widely used in air conditioning indoor units in recent years.
However, the cleanliness of the air conditioner is difficult to ensure due to factors such as poor engineering installation environment and welding oxide skin on the pipeline of the air conditioner, and inevitably fine impurities exist in the pipeline of the air conditioner. The fine impurities in the air conditioner can easily block an electronic expansion valve (or a filter screen in front of the valve) of an indoor unit of the air conditioner. At the moment, problem troubleshooting can be carried out only by disassembling the machine, but the current air conditioner indoor unit is mostly installed in a ceiling layer, the disassembly is very troublesome, and once a suspected expansion valve appears, the disassembly troubleshooting is carried out without distinguishing the severity.
Disclosure of Invention
In view of the above, the present invention is directed to a method for determining blockage of an expansion valve, so as to solve the above-mentioned problems.
In order to achieve the purpose, the technical scheme of the invention is realized as follows:
an expansion valve blockage judging method is applied to an air conditioner and comprises the following steps: acquiring the liquid pipe temperature, the air pipe temperature and the environment temperature of a specified indoor unit in the air conditioner in refrigerating operation; according to the liquid pipe temperature, the air pipe temperature and the environment temperature, and in combination with the opening information of the expansion valve of the specified indoor unit, judging the blockage type of the expansion valve to which the expansion valve of the specified indoor unit belongs; and displaying the blockage type of the expansion valve for overhauling.
Further, the step of determining the type of blockage of the expansion valve to which the expansion valve belongs by combining the opening information of the expansion valve of the specified indoor unit according to the liquid pipe temperature, the air pipe temperature and the ambient temperature includes: judging whether the blockage type of the expansion valve of the specified indoor unit is full blockage or not according to the temperature of the liquid pipe, the temperature of the air pipe and the ambient temperature; and when the opening degree information of the expansion valve of the specified indoor unit is not less than the first preset opening degree threshold value, judging whether the blockage type of the expansion valve of the specified indoor unit is half blockage or not by utilizing the superheat degree obtained based on the liquid pipe temperature and the air pipe temperature.
Further, the method for judging whether the blockage type of the expansion valve of the specified indoor unit is full blockage according to the liquid pipe temperature, the air pipe temperature and the environment temperature comprises the following steps: when the liquid tube temperature and the gas tube temperature satisfy the absolute value Te1-Te2A is less than or equal to a, and the temperature of the liquid pipe, the temperature of the air pipe and the ambient temperature meet (Te)1+Te2) When the/2-Tao | < a, determining the blockage type of the expansion valve of the specified indoor unit is full blockage; middle, Te1Represents the temperature of the liquid pipe, Te2Represents the gas pipe temperature, Tao represents the ambient temperature, and a represents a predetermined first threshold.
Further, the air conditioner includes a multi-split air conditioner composed of a plurality of indoor units, each of the indoor units of the air conditioner corresponds to one expansion valve, and when the opening degree information of the expansion valve of the designated indoor unit is not less than the first preset opening degree threshold, the step of determining whether the blockage type of the expansion valve to which the expansion valve of the designated indoor unit belongs is half-blocked by using the superheat degree obtained based on the liquid pipe temperature and the air pipe temperature includes: calculating an average opening value according to the acquired opening information of the expansion valve of each indoor unit; and when the average opening degree value is not higher than a preset second preset opening degree threshold value and the superheat degree is not lower than a preset second threshold value, judging that the blockage type of the expansion valve of the specified indoor unit is half blockage.
Further, the step of determining the type of blockage of the expansion valve to which the expansion valve of the specified indoor unit belongs further includes: when the opening information of the expansion valve of the specified indoor unit is not smaller than the first preset opening threshold value, calculating the average air pipe temperature according to the obtained air pipe temperature of each indoor unit; when the average opening degree value is not higher than the second preset opening degree threshold value, the superheat degree meets the condition that D is more than 2 and less than or equal to c, and the air pipe temperature of the specified indoor unit and the average air pipe temperature meet
Judging that the blockage type of the expansion valve of the specified indoor unit is slight blockage, wherein D represents the superheat degree, c represents the second threshold value, and T represents the superheat degreee2Is representative of the temperature of the gas pipe,
represents the average trachea temperature and d represents a preset third threshold.
Further, after determining that the type of blockage of the expansion valve of the specified indoor unit is a slight blockage, the method for determining blockage of the expansion valve further comprises: controlling the air conditioner to stop running; and controlling the designated indoor unit to be forcibly switched to a heating mode, so that the refrigerant in the air conditioner reversely flows through the corresponding expansion valve.
Further, the value range of the second preset opening degree threshold is between 250Pls and 400 Pls; the value range of the second threshold is between 4 ℃ and 10 ℃; the value range of the third threshold is between 2 ℃ and 6 ℃.
Compared with the prior art, the method for judging the blockage of the expansion valve has the following advantages:
the method for judging the blockage of the expansion valve distinguishes the blockage type of the expansion valve of the appointed indoor unit by collecting the liquid pipe temperature, the air pipe temperature and the environment temperature corresponding to the appointed indoor unit in the using process of the air conditioner and combining the opening information of the expansion valve of the appointed indoor unit, and displays the blockage type of the expansion valve to a user. Through the judgment of the blockage of the expansion valve and the classification of the blockage condition, a user can conveniently report and repair the expansion valve, effective maintenance guide information can be provided for maintenance personnel, unnecessary disassembly is avoided, and the maintenance efficiency is improved.
Another objective of the present invention is to provide an air conditioner to improve the above mentioned problems.
In order to achieve the purpose, the technical scheme of the invention is realized as follows:
an air conditioner, comprising: the collection unit is used for acquiring the liquid pipe temperature, the air pipe temperature and the environment temperature of a specified indoor unit in the air conditioner in refrigerating operation; the processing unit is used for judging the blockage type of the expansion valve of the specified indoor unit by combining the opening information of the expansion valve of the specified indoor unit according to the liquid pipe temperature, the air pipe temperature and the environment temperature; and the display unit is used for displaying the blockage type of the expansion valve so as to be convenient to overhaul.
Further, the processing unit is specifically configured to: judging whether the blockage type of the expansion valve of the specified indoor unit is full blockage or not according to the temperature of the liquid pipe, the temperature of the air pipe and the ambient temperature; and when the opening degree information of the expansion valve of the specified indoor unit is not less than the first preset opening degree threshold value, judging whether the blockage type of the expansion valve of the specified indoor unit is half blockage or not by utilizing the superheat degree obtained based on the liquid pipe temperature and the air pipe temperature.
Further, the air conditioner includes a multi-split air conditioner composed of a plurality of indoor units, each indoor unit of the air conditioner corresponds to one expansion valve, and when the opening information of the expansion valve of the specified indoor unit is not less than the first preset opening threshold, the processing unit is further specifically configured to: calculating an average opening value according to the acquired opening information of the expansion valve of each indoor unit; and when the average opening degree value is not higher than a preset second preset opening degree threshold value and the superheat degree is not lower than a preset second threshold value, judging that the blockage type of the expansion valve of the specified indoor unit is half blockage.
Compared with the prior art, the air conditioner and the method for judging the blockage of the expansion valve have the same advantages, and are not repeated herein.
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 flow chart illustrating steps of a method for determining blockage of an expansion valve according to an embodiment of the present invention;
fig. 2 is a schematic view of a partial structure of an indoor unit according to an embodiment of the present invention;
FIG. 3 is a flowchart illustrating sub-steps of step S102 in FIG. 1;
fig. 4 is a schematic structural diagram of an air conditioner according to an embodiment of the present invention.
Description of reference numerals:
the system comprises a liquid pipe joint 1, a liquid pipe expansion valve 2, a liquid pipe temperature sensing bulb 3, an evaporator 4, an environment temperature sensing bulb 5, an air pipe temperature sensing bulb 6, an air pipe joint 7, an air conditioner 8, an acquisition unit 9, a processing unit 10 and a display unit 11.
Detailed Description
It should be noted that the embodiments and features of the embodiments may be combined with each other without conflict.
In addition, the air conditioner mentioned in the embodiment of the present invention may be a multi-split air conditioner corresponding to a plurality of indoor units, or may be a conventional air conditioner having only one indoor unit, and is preferably a multi-split air conditioner corresponding to a plurality of indoor units. The designated indoor unit mentioned in the embodiment of the present invention refers to an indoor unit of an air conditioner when the air conditioner has only one indoor unit, and refers to one or more indoor units selected by a user from the indoor units corresponding to the air conditioner when the air conditioner includes a plurality of indoor units. The type of the expansion valve blockage referred to in the embodiments of the present invention refers to a pre-selected blockage type, and may include full blockage, half blockage, and slight blockage. The full blockage referred to in the embodiments of the present invention refers to the situation where the refrigerant is completely unable to pass through the expansion valve. The semi-blockage referred to in the embodiments of the present invention refers to a situation where the blockage exists in the current expansion valve, but the refrigerant can still pass through the expansion valve and cannot be eliminated through the self-regulation of the air conditioner. The slight blockage in the embodiment of the present invention means that the blockage exists in the current expansion valve, but the refrigerant can still pass through the expansion valve and can be eliminated through the self-regulation of the air conditioner.
Moreover, 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.
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. 1, an embodiment of the invention provides a method for determining blockage of an expansion valve, which can be applied to an air conditioner 8. Preferably, the air conditioner 8 may be a multi-split air conditioner, and it is understood that other types of air conditioners may be adopted. Alternatively, the method for determining the blockage of the expansion valve may include the steps of:
step S101, a liquid pipe temperature, an air pipe temperature, and an ambient temperature of a specified indoor unit in the air conditioner 8 in the cooling operation are acquired.
In the embodiment of the present invention, as shown in fig. 2, a plurality of temperature sensors are disposed in each indoor unit of the air conditioner 8. Alternatively, the plurality of temperature sensors may include a liquid tube bulb 3 disposed on a liquid tube connecting the expansion valve 2 and the evaporator 4, a gas tube bulb 6 disposed on a gas tube connecting the evaporator 4 and the gas tube joint 7, and an environment bulb 5 disposed outside the evaporator 4. The liquid pipe temperature sensing bulb 3 may be configured to collect a liquid pipe temperature of the corresponding indoor unit, the air pipe temperature sensing bulb 6 may be configured to collect an air pipe temperature of the corresponding indoor unit, and the environment temperature sensing bulb 5 may be configured to collect an environment temperature of the corresponding indoor unit. When the air conditioner 8 is started to normally perform cooling operation, the refrigerant enters each indoor unit from the outdoor unit side, passes through the liquid pipe joint 1, the expansion valve 2, the evaporator 4 and the gas pipe joint 7 of each indoor unit in sequence, and finally returns to the outdoor unit. In the process, the high-pressure medium-temperature refrigerant obtained by condensing the outdoor unit passes through the liquid pipe joint 1, then passes through the expansion valve 2, is changed into a low-temperature low-pressure gas-liquid mixed refrigerant, enters the evaporator 4, is absorbed by heat, and is evaporated into a gaseous refrigerant, and then returns to the outdoor unit through the gas pipe joint 7. The plurality of temperature sensors can respectively acquire the liquid pipe temperature, the air pipe temperature and the environment temperature of the corresponding indoor unit when the air conditioner 8 operates in a refrigerating mode.
Further, in the operation process of the air conditioner 8, when an indoor unit is selected as a designated indoor unit, the liquid pipe temperature, the air pipe temperature and the ambient temperature corresponding to the designated indoor unit are obtained by starting the plurality of temperature sensors installed on the designated indoor unit. As an embodiment, a mode of selecting an indoor unit corresponding to the air conditioner 8 as a specific indoor unit may be: the user can send an expansion valve 2 blockage detection instruction to an indoor unit corresponding to the air conditioner 8, and take the indoor unit receiving the detection instruction as a designated indoor unit. Of course, it can be understood that the designated indoor unit may be selected from the indoor units corresponding to the air conditioner 8 in other manners, which is not limited to this. For example, an indoor unit that is activated in the air conditioner 8 may be used as the designated indoor unit. It should be noted that, in the embodiment of the present invention, there may be a case where a plurality of specified indoor units are present at the same time, and even if there are a plurality of specified indoor units, the determination principles of whether the expansion valve 2 of each specified indoor unit is blocked and the type of the corresponding blockage are the same.
Furthermore, the opening degree of the expansion valve 2 of the designated indoor unit can be monitored in real time while the liquid pipe temperature, the air pipe temperature and the ambient temperature of the designated indoor unit are obtained. Preferably, the expansion valve 2 is an electronic expansion valve 2, and the opening degree information of the expansion valve 2 can be read in real time, so that the opening degree of the expansion valve 2 of a specific indoor unit can be monitored in real time.
And step S102, judging the blockage type of the expansion valve of the specified indoor unit, wherein the blockage type of the expansion valve of the specified indoor unit belongs to the expansion valve 2, according to the liquid pipe temperature, the air pipe temperature and the environment temperature by combining the opening information of the expansion valve 2 of the specified indoor unit.
It should be noted that, in the related art, when the air conditioner 8 has a poor cooling effect, a user may make a complaint and repair, however, when the repair is made, only the information that the cooling effect is poor may be provided to the maintenance staff, and for the maintenance staff, it is necessary to perform troubleshooting by disassembling the machine to check whether the expansion valve 2 is blocked, but the disassembling the machine is very inconvenient for most of the indoor units installed in the ceiling floor. If all the refrigeration effect differences are disassembled, on one hand, the effect differences caused by blockage are not affected, and manpower and material resources are wasted; on the other hand, the blockage which can be solved by adjusting the operation strategy by the air conditioner 8 without disassembling the machine is also very labor and material waste.
Therefore, in order to provide more reliable maintenance guide information for maintenance personnel, the waste of manpower and material resources is also avoided. In the embodiment of the invention, whether blockage occurs is determined according to the liquid pipe temperature, the air pipe temperature and the environment temperature, and the blockage type of the expansion valve is further judged according to the opening information of the expansion valve 2 of the specified indoor unit, so that effective maintenance guide information is provided for maintenance personnel, the maintenance efficiency is improved, and the maintenance cost is reduced.
Alternatively, as shown in fig. 3, the step of determining the blockage type of the expansion valve 2 of the designated indoor unit according to the liquid pipe temperature, the air pipe temperature and the ambient temperature by combining the opening degree information of the expansion valve 2 of the designated indoor unit may include:
and a substep S1021, judging whether the blockage type of the expansion valve 2 of the designated indoor unit is full blockage or not according to the liquid pipe temperature, the air pipe temperature and the environment temperature.
In the embodiment of the present invention, whether the expansion valve 2 is fully blocked may be determined by determining whether the liquid tube temperature, the gas tube temperature, and the ambient temperature are close to each other. Namely, when the expansion valve 2 is fully blocked, no refrigerant can pass through the air pipe, the liquid pipe and the evaporator 4 of the indoor unit, and the corresponding indoor unit does not have any refrigeration effect. As an embodiment, if preset proximity conditions are satisfied among the obtained liquid tube temperature, gas tube temperature, and ambient temperature, it may be considered that the liquid tube temperature, gas tube temperature, and ambient temperature are close to each other. Therefore, if the obtained liquid pipe temperature, the obtained air pipe temperature and the obtained environment temperature satisfy the preset approaching conditions, the type of the blockage of the expansion valve to which the expansion valve 2 of the specified indoor unit belongs is judged to be full blockage.
Further, the manner of determining that the liquid tube temperature, the gas tube temperature and the ambient temperature satisfy the proximity condition may be:
when the temperature of the liquid pipe and the temperature of the air pipe satisfy the temperature of Te1-Te2A is less than or equal to a, and the temperature of the liquid pipe, the temperature of the air pipe and the ambient temperature meet (Te)1+Te2) And when the/2-Tao | < a, determining that the liquid pipe temperature, the air pipe temperature and the environment temperature meet the approaching conditions. Note that Te is as described above1Represents the temperature of the liquid pipe, Te2Represents the gas pipe temperature, Tao represents the ambient temperature, and a represents a predetermined first threshold. Optionally, the first threshold is between 0 and 4, for example, the first threshold may be selected to be 2.
It will be appreciated, of course, that in other embodiments, the proximity between the fluid tube temperature, the air tube temperature, and the ambient temperature may be determined in other ways.
After determining that the full occlusion is present, the flow proceeds directly to step S103. As an embodiment, when it is determined through the sub-step S1021 that the full congestion is not included, the flow proceeds to the sub-step S1022.
In the substep S1022, when the opening degree information of the expansion valve 2 of the designated indoor unit is not less than the first preset opening degree threshold value, it is determined whether the type of blockage of the expansion valve to which the expansion valve 2 of the designated indoor unit belongs is half-blocked or not, using the degree of superheat obtained based on the liquid pipe temperature and the air pipe temperature.
In the embodiment of the present invention, the first preset opening degree threshold value may be set to any opening degree value exceeding the range of the normal opening degree of the expansion valve 2. It should be noted that, when the expansion valve 2 is stably in the normal opening range, the indoor unit can provide a cooling effect satisfactory to the user. Preferably, it may be set to the maximum opening degree of the expansion valve 2, for example, the normal opening degree of the expansion valve 2 ranges from 100 to 300Pls, and the first preset opening degree threshold may be set to 480 Pls.
Further, since the expansion valve 2 in the half-block state is smaller in flow rate and larger in superheat degree at the same opening degree as compared with the non-block state of the expansion valve 2 during the operation of the air conditioner 8, the air conditioner 8 adjusts the opening degree of the expansion valve 2 based on the superheat degree. Therefore, in order to satisfy the cooling requirement, the opening degree of the expansion valve 2, which is half-blocked, is continuously increased to reduce the degree of superheat by passing more refrigerant, and this phenomenon may be expressed in that the degree of superheat is still high even when the electronic expansion valve 2 is opened to the maximum.
Therefore, in the embodiment of the present invention, if it is monitored that the expansion valve 2 reaches the first preset opening threshold, the corresponding superheat degree is calculated based on the liquid pipe temperature and the air pipe temperature, so as to determine whether the valve is in the half blockage state according to the superheat degree. Specifically, the manner of calculating the degree of superheat may be such that the difference between the air pipe temperature and the liquid pipe temperature of the specified indoor unit is taken as the corresponding degree of superheat.
Further, in order to eliminate the influence of the half blockage determination accuracy due to lack of refrigerant in the air conditioner 8, in the embodiment of the present invention, the specific manner of determining whether the half blockage is present based on the obtained corresponding superheat degree may include:
the current opening information of the expansion valve 2 of each indoor unit is obtained, and an average opening value is calculated according to the obtained current opening information of the expansion valve 2 of each indoor unit. And when the average opening degree value is not higher than a second preset opening degree threshold value and the superheat degree is not lower than a preset second threshold value, judging that the blockage type of the expansion valve to which the expansion valve 2 of the specified indoor unit belongs is half blockage. It should be noted that the second preset opening degree threshold ranges from 250Pls to 400Pls, for example, the second preset opening degree threshold may be set to 300Pls, and the second threshold ranges from 4 ℃ to 10 ℃, for example, the second threshold may be set to 7 ℃. When it is determined that the partial obstruction is present, the flow proceeds to step S103. As an embodiment, after determining that the semi-blocking is not included, the flow may proceed to step S1023.
It should be noted that, when it is determined that the congestion is half-congestion and the degree of superheat is exactly equal to the second threshold, the process may further enter the sub-step S1023 to exclude the possibility of slight congestion, and if it is determined that the congestion is not slight by the sub-step S1023, it is determined that the corresponding congestion type is half-congestion.
And a substep S1023 of judging whether the designated indoor unit is slightly blocked or not according to the temperatures of the air pipes corresponding to the air conditioner 8, the average opening value, the superheat degree of the designated indoor unit and the opening information of the designated indoor unit.
In the embodiment of the present invention, when the opening degree information of the expansion valve 2 of a specific indoor unit is not less than the first preset opening degree threshold, the average air pipe temperature is calculated according to the obtained air pipe temperature of each indoor unit. When the average opening degree value is not higher than a second preset opening degree threshold value, the superheat degree meets the condition that D is more than 2 and less than or equal to c, and the air pipe temperature of the specified indoor unit and the calculated average air pipe temperature meet
And judging that the blockage type of the expansion valve 2 of the specified indoor unit is slightly blocked. Otherwise, it is not considered to be a slight occlusion.
It is to be noted thatD represents the degree of superheat, c represents the second threshold value, and Te2Representing the air pipe temperature of the given indoor unit,
represents the average trachea temperature calculated above, and d represents a preset third threshold. Optionally, the value range of the third threshold may be between 2 ℃ and 6 ℃, for example, the third threshold may be set to 4 ℃.
It should be noted that, in other embodiments, there may not be a certain order between the sub-steps S1021, S1022, and S1023. After it is determined by the sub-step S1023 that it is a slight jam, the flow proceeds to a step S103.
Further, when the type of blockage corresponding to the specified indoor unit is judged to be slight blockage, the method for judging blockage of the expansion valve may further include: the air conditioner 8 is controlled to stop running, and then the specified indoor unit is controlled to be forcibly switched to the heating mode, so that the refrigerant in the air conditioner 8 reversely flows through the corresponding expansion valve 2, namely, the mode that the refrigerant enters the expansion valve 2 from the outdoor unit side is changed into the mode that the refrigerant enters the expansion valve 2 from the evaporator 4 side. The clogging foreign matter is washed by the reverse flow of the refrigerant.
And step S103, displaying the blockage type of the expansion valve so as to be convenient for maintenance.
In the embodiment of the present invention, after it is determined that the expansion valve 2 of the designated indoor unit is clogged and the clogging type is determined, the air conditioner 8 may transmit the determined clogging type to the display terminal designated by the user for display. The display terminal may be a display screen provided on a designated indoor unit, or may be a mobile terminal bound to the air conditioner 8 in advance. This can be automatically performed without disassembling the apparatus when the specified indoor unit expansion valve 2 is clogged or the type of clogging to which the indoor unit expansion valve belongs. Maintenance guide information can be intelligently provided for maintenance personnel, unnecessary maintenance operation is avoided being executed, efficient maintenance service is convenient to provide, and user experience is enhanced.
Second embodiment
Referring to fig. 4, an air conditioner 8 is further provided in the embodiment of the present invention. Optionally, the air conditioner 8 may include a collecting unit 9, a processing unit 10, and a display unit 11. The collecting unit 9 is electrically connected to the processing unit 10. The display unit 11 is connected to the processing unit 10, and specifically, the connection between the display unit 11 and the processing unit 10 may be an electrical connection or a communication connection. It should be noted that the above-mentioned electrical connection means that a transmission channel is established between the display unit 11 and the processing unit 10 through a dielectric medium, so as to transmit signals between the display unit 11 and the processing unit 10. The communication connection may be a signal transmission channel established in a wireless manner through the communication module, so as to transmit signals between the display unit 11 and the processing unit 10.
As an embodiment, each indoor unit corresponds to one collection unit 9, the collection unit 9 may include a plurality of temperature sensors, and the plurality of temperature sensors may include a liquid tube thermal bulb 3 disposed on a liquid tube connecting the expansion valve 2 and the evaporator 4, a gas tube thermal bulb 6 disposed on a gas tube connecting the evaporator 4 and the gas tube connector 7, and an environment thermal bulb 5 disposed outside the evaporator 4. The liquid pipe temperature sensing bulb 3 may be configured to collect a liquid pipe temperature of the corresponding indoor unit, the air pipe temperature sensing bulb 6 may be configured to collect an air pipe temperature of the corresponding indoor unit, and the environment temperature sensing bulb 5 may be configured to collect an environment temperature of the corresponding indoor unit.
As an embodiment, the display unit 11 may be a display screen disposed outside the indoor unit, or may be an intelligent terminal (e.g., a mobile phone) previously bound with the air conditioner 8.
As an embodiment, the processing unit 10 may be a CPU of the air conditioner 8, which has certain data processing capability to facilitate analysis and judgment.
Further, in the embodiment of the present invention, the collecting unit 9 is configured to obtain a liquid pipe temperature, an air pipe temperature, and an ambient temperature of a specified indoor unit in the air conditioner 8 in the cooling operation.
The processing unit 10 determines the type of blockage of the expansion valve 2 of the specified indoor unit based on the liquid pipe temperature, the air pipe temperature, and the ambient temperature, in combination with the opening degree information of the expansion valve 2 of the specified indoor unit.
The above-mentioned display unit 11 displays the type of the blockage of the expansion valve for the convenience of maintenance.
It can be clearly understood by those skilled in the art that, for convenience and brevity of description, the specific working process of the air conditioner 8 described above may refer to the corresponding process in the foregoing method embodiment, and is not described herein again.
In summary, the embodiments of the present invention provide a method for determining blockage of an expansion valve and an air conditioner. The method for judging the blockage of the expansion valve is applied to an air conditioner. The method for determining the blockage of the expansion valve comprises the following steps: acquiring the liquid pipe temperature, the air pipe temperature and the environment temperature of a specified indoor unit in the air conditioner in refrigerating operation; according to the liquid pipe temperature, the air pipe temperature and the environment temperature, and in combination with the opening information of the expansion valve of the specified indoor unit, judging the blockage type of the expansion valve to which the expansion valve of the specified indoor unit belongs; and displaying the blockage type of the expansion valve for overhauling. Through the judgment of the blockage of the expansion valve and the classification of the blockage condition, a user can conveniently report and repair the expansion valve, effective maintenance guide information can be provided for maintenance personnel, unnecessary disassembly is avoided, and the maintenance efficiency is improved.
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 blockage judging method is applied to an air conditioner (8), and is characterized by comprising the following steps:
acquiring the liquid pipe temperature, the air pipe temperature and the environment temperature of a specified indoor unit in the air conditioner (8) in refrigerating operation;
according to the liquid pipe temperature, the air pipe temperature and the environment temperature, the opening degree information of the expansion valve (2) of the specified indoor unit is combined, and the blockage type of the expansion valve to which the expansion valve (2) of the specified indoor unit belongs is judged; judging whether the blockage type of the expansion valve (2) of the specified indoor unit is full blockage or not according to the temperature of the liquid pipe, the temperature of the air pipe and the ambient temperature; when the opening information of the expansion valve (2) of the specified indoor unit is not less than a preset first preset opening threshold, judging whether the blockage type of the expansion valve to which the expansion valve (2) of the specified indoor unit belongs is half blockage or not by utilizing the superheat degree obtained based on the temperature of the liquid pipe and the temperature of the air pipe;
and displaying the blockage type of the expansion valve for overhauling.
2. The method for determining clogging of an expansion valve according to claim 1, wherein the manner of determining whether the type of clogging to which the expansion valve (2) of the specified indoor unit belongs is full clogging based on the liquid pipe temperature, the air pipe temperature, and the ambient temperature includes:
when the liquid tube temperature and the gas tube temperature satisfy the absolute value Te1-Te2A is less than or equal to a, and the temperature of the liquid pipe, the temperature of the air pipe and the ambient temperature meet (Te)1+Te2) When the/2-Tao | < a, determining the blockage type of the expansion valve (2) of the specified indoor unit is full blockage; wherein Te1Represents the temperature of the liquid pipe, Te2Represents the gas pipe temperature, Tao represents the ambient temperature, and a represents a predetermined first threshold.
3. The method for determining blockage of an expansion valve according to claim 1, wherein the air conditioner (8) comprises a multi-split air conditioner comprising a plurality of indoor units, each of the indoor units of the air conditioner (8) corresponds to one of the expansion valves (2), and when the opening degree information of the expansion valve (2) of the specified indoor unit is not less than the first preset opening degree threshold, the step of determining whether the blockage type of the expansion valve (2) of the specified indoor unit is half-blocked or not by using the superheat degree obtained based on the liquid pipe temperature and the air pipe temperature comprises:
calculating an average opening value according to the acquired opening information of the expansion valve (2) of each indoor unit;
and when the average opening degree value is not higher than a preset second preset opening degree threshold value and the superheat degree is not lower than a preset second threshold value, judging that the blockage type of the expansion valve (2) of the specified indoor unit is half blockage.
4. The method for determining an expansion valve blockage according to claim 3, wherein the step of determining the type of the blockage of the expansion valve (2) of the specified indoor unit further comprises:
when the opening information of the expansion valve (2) of the specified indoor unit is not less than the first preset opening threshold, calculating the average air pipe temperature according to the obtained air pipe temperature of each indoor unit;
when the average opening degree value is not higher than the second preset opening degree threshold value, the superheat degree meets the condition that D is more than 2 and less than or equal to c, and the air pipe temperature of the specified indoor unit and the average air pipe temperature meet
Judging that the type of the blockage of the expansion valve (2) of the specified indoor unit is slight blockage, wherein D represents the superheat degree, c represents the second threshold value, and T represents the second threshold valuee2Is representative of the temperature of the gas pipe,
represents the average trachea temperature and d represents a preset third threshold.
5. The method for determining clogging of an expansion valve according to claim 4, wherein after determining that the type of clogging of an expansion valve (2) of the specified indoor unit belongs to is a slight clogging, the method for determining clogging of an expansion valve further comprises:
controlling the air conditioner (8) to stop running;
and controlling the designated indoor unit to forcibly switch to a heating mode, so that the refrigerant in the air conditioner (8) reversely flows through the corresponding expansion valve (2).
6. An expansion valve clogging determination method according to claim 5, wherein the second preset opening degree threshold value has a value ranging from 250Pls to 400 Pls; the value range of the second threshold is between 4 ℃ and 10 ℃; the value range of the third threshold is between 2 ℃ and 6 ℃.
7. An air conditioner, characterized in that the air conditioner (8) comprises:
the acquisition unit (9) is used for acquiring the liquid pipe temperature, the air pipe temperature and the environment temperature of a specified indoor unit in the air conditioner (8) in refrigeration operation;
the processing unit (10) is used for judging the blockage type of the expansion valve (2) of the specified indoor unit according to the liquid pipe temperature, the air pipe temperature and the environment temperature and by combining the opening information of the expansion valve (2) of the specified indoor unit; wherein the processing unit (10) is specifically configured to: judging whether the blockage type of the expansion valve (2) of the specified indoor unit is full blockage or not according to the temperature of the liquid pipe, the temperature of the air pipe and the ambient temperature; when the opening degree information of the expansion valve (2) of the specified indoor unit is not less than a first preset opening degree threshold value, judging whether the blockage type of the expansion valve to which the expansion valve (2) of the specified indoor unit belongs is half blockage or not by utilizing the superheat degree obtained based on the temperature of the liquid pipe and the temperature of the air pipe;
and the display unit (11) is used for displaying the blockage type of the expansion valve so as to be convenient for maintenance.
8. The air conditioner according to claim 7, wherein the air conditioner (8) comprises a multi-split air conditioner comprising a plurality of indoor units, each of the indoor units of the air conditioner (8) corresponds to one of the expansion valves (2), and when the opening degree information of the expansion valve (2) of the specified indoor unit is not less than the first preset opening degree threshold, the processing unit (10) is further configured to:
calculating an average opening value according to the acquired opening information of the expansion valve (2) of each indoor unit;
and when the average opening degree value is not higher than a preset second preset opening degree threshold value and the superheat degree is not lower than a preset second threshold value, judging that the blockage type of the expansion valve (2) of the specified indoor unit is half blockage.
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| CN110296499B (en) * | 2019-07-09 | 2020-04-24 | 宁波奥克斯电气股份有限公司 | Electronic expansion valve abnormality reason judgment method and device and air conditioner |
| CN110411086B (en) * | 2019-08-22 | 2021-09-21 | 宁波奥克斯电气股份有限公司 | Filter blockage judging method, multi-connection air conditioner and readable medium |
| CN110553344B (en) * | 2019-09-09 | 2020-08-11 | 珠海格力电器股份有限公司 | Multi-split air conditioner and throttling component fault determination method of indoor unit of multi-split air conditioner |
| CN110542196B (en) * | 2019-09-16 | 2021-05-18 | 广东美的暖通设备有限公司 | Detection assembly for air conditioner, control method, control device and air conditioner |
| CN111721040A (en) * | 2020-06-23 | 2020-09-29 | 郭雪虎 | Method for overhauling and cleaning blockage of expansion valve of heat pump unit |
| CN112556090B (en) * | 2020-12-11 | 2022-07-08 | 四川长虹空调有限公司 | Method for detecting blockage of air conditioning system |
| CN113551369B (en) * | 2021-07-09 | 2022-04-26 | 珠海格力电器股份有限公司 | Control system for detecting blockage of refrigeration system and blockage detection method |
| CN114151920B (en) * | 2021-11-18 | 2023-02-10 | 宁波奥克斯电气股份有限公司 | Air conditioner system blockage detection method and device and air conditioner |
| CN115523610B (en) * | 2022-08-30 | 2024-06-14 | 宁波奥克斯电气股份有限公司 | Multi-split blocking control method and device and multi-split |
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| CN102401447B (en) * | 2011-05-24 | 2014-04-16 | 宁波奥克斯电气有限公司 | Method for processing disorderly closedown caused by partial blockage of inside pipeline of varied refrigerant volume (VRV) air-conditioning chamber |
| CN105588285A (en) * | 2016-01-21 | 2016-05-18 | 青岛工学院 | Air conditioner based on pipeline blocking self-diagnosis method |
| CN108731127B (en) * | 2018-06-06 | 2020-09-04 | 青岛海信日立空调系统有限公司 | Multi-pipe multi-connected outdoor unit and pipeline detection method and device thereof |
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