Device and method for detecting electronic expansion valve in air conditioning unit

Abstract

The present invention relates to a device and method for detecting electronic expansion valves in air conditioning units. The device comprises: a power detection module connected to the air conditioning unit and capable of obtaining the power consumption of the air conditioning unit during operation; and a logic control module connected to the power detection module and capable of determining, based on power changes in the air conditioning unit, whether the electronic expansion valve of the air conditioning unit has performed a reset function during its startup. If so, the logic control module outputs a first message; if not, the logic control module outputs a second message. The device and method for detecting electronic expansion valves in air conditioning units of the present invention can address the subjective misjudgment and missed detection issues associated with manual electronic expansion valve detection, and can also identify electronic expansion valves damaged during installation in the air conditioning unit. This helps improve the yield rate of electronic expansion valves and, by extension, air conditioners.

Description

Technical Field

[0001] The present invention belongs to the technical field of workpiece detection, and in particular relates to a device and method for detecting an electronic expansion valve in an air-conditioning unit. Background Art

[0002] An electronic expansion valve is a throttling element used in refrigeration equipment such as air conditioners. In some situations where loads fluctuate drastically or the operating conditions are wide, traditional throttling elements (such as capillary tubes and thermal expansion valves) can no longer meet the requirements for comfort and energy conservation. Electronic expansion valves have been increasingly widely used, their production scale is constantly expanding, and the demand for automation is also increasing. In the existing technology, the inspection operation of electronic expansion valves is mainly completed manually one by one. However, manual inspection of electronic expansion valves is prone to subjective misjudgment and missed inspections. In addition, electronic expansion valves that have qualified inspection results may be damaged during the installation process of the air conditioning unit. This not only seriously reduces the accuracy of the inspection, but also limits the improvement of the yield rate of the air conditioning unit. Summary of the Invention

[0003] In order to solve all or part of the above problems, the purpose of the present invention is to provide a device and method for detecting electronic expansion valves in air-conditioning units, so as to solve the problems of subjective misjudgment and missed detection in manual detection of electronic expansion valves, and to detect electronic expansion valves damaged during installation in the air-conditioning unit, which helps to improve the yield of electronic expansion valves and even air-conditioning units.

[0004] According to a first aspect of the present invention, a device for detecting an electronic expansion valve in an air-conditioning unit is provided, comprising: a power detection module for connecting to the air-conditioning unit and capable of obtaining the power of the air-conditioning unit during operation; a logic control module connected to the power detection module, which can determine, based on the power change of the air-conditioning unit, whether the electronic expansion valve of the air-conditioning unit has performed a reset function during the startup of the electronic expansion valve; if so, the logic control module outputs first information; if not, the logic control module outputs second information, wherein the first information includes information that the electronic expansion valve has normally completed the reset function, and the second information includes information that the electronic expansion valve has not normally performed the reset function.

[0005] Furthermore, the logic control module is configured to: be able to determine whether the power change of the air-conditioning unit always falls within the specified range during the startup process of the electronic expansion valve. If so, the judgment information is that the electronic expansion valve of the air-conditioning unit has performed the reset function when it was started; if not, the judgment information is that the electronic expansion valve of the air-conditioning unit has not performed the reset function when it was started.

[0006] Furthermore, the prescribed range is 0.8-1.2 times the power required by the electronic expansion valve when performing a reset function.

[0007] Furthermore, the startup process of the electronic expansion valve takes 1-2 seconds, and the initial time point of the startup process of the electronic expansion valve is 5, 6 or 7 seconds after the air-conditioning unit is started.

[0008] Furthermore, the device also includes a human-computer interaction module connected to the logic control module and capable of displaying or broadcasting the first information and the second information.

[0009] Furthermore, the human-computer interaction module includes a display screen and / or a speaker.

[0010] Furthermore, the power detection module includes a thermistor power meter, a thermocouple power meter or a crystal detection power meter connected to the control board of the air-conditioning unit.

[0011] According to a second aspect of the present invention, a method for detecting an electronic expansion valve in an air-conditioning unit is provided, comprising: obtaining the power of the air-conditioning unit during operation; judging, based on the power of the air-conditioning unit, whether the electronic expansion valve of the air-conditioning unit has performed a reset function during the startup of the electronic expansion valve, and if so, outputting first information; if not, outputting second information, wherein the first information includes information that the electronic expansion valve has normally completed the reset function, and the second information includes information that the electronic expansion valve has not normally performed the reset function.

[0012] Furthermore, the method also includes determining whether the power change of the air-conditioning unit always falls within a specified range during the startup process of the electronic expansion valve. If so, the judgment information is that the electronic expansion valve of the air-conditioning unit has performed a reset function when it was started; if not, the judgment information is that the electronic expansion valve of the air-conditioning unit has not performed a reset function when it was started.

[0013] Furthermore, the value range of the specified range is 0.8-1.2 times the power required by the electronic expansion valve when performing the reset function, the startup process of the electronic expansion valve takes 1-2 seconds, and the initial time point of the startup process of the electronic expansion valve is the 5th, 6th or 7th second after the air-conditioning unit is started.

[0014] As can be seen from the above technical solution, the device and method for inspecting an electronic expansion valve in an air conditioning unit of the present invention primarily utilizes a power detection module to obtain the power consumption of the air conditioning unit during operation. A logic control module then uses the power variation of the air conditioning unit to determine whether the electronic expansion valve in the air conditioning unit has executed a reset function during startup. When the electronic expansion valve has executed the reset function, the logic control module outputs a first message based on the power variation measured by the power detection module, allowing the operator to determine that the electronic expansion valve has executed the reset function, thereby confirming that the electronic expansion valve is of acceptable quality. When the electronic expansion valve has executed the reset function, the logic control module outputs a second message based on the power variation measured by the power detection module, allowing the operator to determine that the electronic expansion valve has not executed the reset function, thereby confirming that the electronic expansion valve is of unacceptable quality. Therefore, the device and method for inspecting an electronic expansion valve in an air conditioning unit of the present invention can address the subjective misjudgment and missed detection issues associated with manual inspection of electronic expansion valves. Furthermore, it can identify electronic expansion valves damaged during installation in the air conditioning unit, thereby helping to improve the yield rate of electronic expansion valves and, consequently, air conditioners. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] The preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings. In the drawings:

[0016] Figure 1 Schematically shows an air-conditioning unit and a device for detecting an electronic expansion valve in the air-conditioning unit according to an embodiment of the present invention;

[0017] Figure 2 This is a flow chart of a method for detecting an electronic expansion valve in an air-conditioning unit according to a second embodiment of the present invention.

[0018] In the drawings, like parts are given like reference numerals, but the drawings are not necessarily drawn to scale. DETAILED DESCRIPTION

[0019] The present invention will be further described below with reference to the accompanying drawings.

[0020] Figure 1 The figure schematically shows an air-conditioning unit and a device for detecting an electronic expansion valve in the air-conditioning unit according to an embodiment of the present invention. Figure 1As shown, the device 100 primarily comprises a power detection module 1 and a logic control module 2. The power detection module 1 is connected to the air conditioning unit 300 and is capable of obtaining the power consumption of the air conditioning unit 300 during operation. The logic control module 2 is connected to the power detection module 1 and, based on the power changes of the air conditioning unit 300, determines whether the electronic expansion valve 301 of the air conditioning unit 300 has performed a reset function during the startup process of the electronic expansion valve 301. If so, the logic control module 2 outputs a first message. If not, the logic control module 2 outputs a second message. The first message indicates that the electronic expansion valve 301 has successfully completed the reset function, while the second message indicates that the electronic expansion valve 301 has not successfully completed the reset function. Resetting refers to controlling the electronic expansion valve 301 to switch to an initial opening. The initial opening is preferably a fully open or fully closed state. The logic control module 2 may include a programmable logic control unit (such as a PLC or CPU), a memory, and electronic components connected to the programmable logic control unit, all of which are well known to those skilled in the art and will not be described in detail here.

[0021] The device 100 for testing an electronic expansion valve in an air conditioning unit according to an embodiment of the present invention primarily utilizes a power detection module 1 to obtain the power consumption of the air conditioning unit 300 during operation. The logic control module 2 then uses the power variation of the air conditioning unit 300 to determine whether the electronic expansion valve 301 of the air conditioning unit 300 has executed a reset function during startup. When the electronic expansion valve 301 has executed the reset function, the logic control module 2 can output a first message based on the power variation measured by the power detection module 1, allowing the operator to determine that the electronic expansion valve 301 has executed the reset function and, therefore, that the electronic expansion valve 301 is of acceptable quality. When the electronic expansion valve 301 has not executed the reset function, the logic control module 2 can output a second message based on the power variation measured by the power detection module 1, allowing the operator to determine that the electronic expansion valve 301 has not executed the reset function and, therefore, that the electronic expansion valve 301 is of unacceptable quality. Therefore, the device 100 for detecting the electronic expansion valve in the air-conditioning unit of the present invention can solve the problem of subjective misjudgment and missed detection in manual detection of the electronic expansion valve 301, and can detect the electronic expansion valve 301 damaged during the installation process in the air-conditioning unit 300, which helps to improve the yield of the electronic expansion valve 301 and even the air conditioner.

[0022] In this embodiment, to accurately and quickly determine whether the electronic expansion valve 301 has executed the reset function, the logic control module 2 is configured to determine whether the power variation of the air conditioning unit 300 remains within a specified range during the startup process of the electronic expansion valve 301. If so, the determination indicates that the electronic expansion valve 301 of the air conditioning unit 300 has executed the reset function upon startup. A first message is output to inform the operator that the electronic expansion valve 301 has executed the reset function. If not, the determination indicates that the electronic expansion valve 301 of the air conditioning unit 300 has not executed the reset function upon startup. A second message is output to inform the operator that the electronic expansion valve 301 has not executed the reset function. The power variation is defined as the power of the air conditioning unit 300 after startup minus the power of the air conditioning unit 300 before startup. Preferably, when the specified range is selected as 0.8-1.2 times the power required by the electronic expansion valve 301 when performing the reset function, the logic control module 2 can not only be informed in time when the electronic expansion valve 301 performs the reset function, but also eliminate the error caused by unstable power of the air-conditioning unit 300, thereby helping to reduce the misjudgment rate. In a more preferred embodiment, the logic control module 2 is configured to store the output first information or second information after outputting the first information or the second information for easy tracing by the operator. A large number of experiments have shown that it takes 3 or 4 seconds to start the air-conditioning unit 300, so the initial time point of the startup process of the electronic expansion valve 301 is selected as the 5th, 6th or 7th second after the air-conditioning unit 300 is started, especially the 6th second, so that the detection accuracy can be improved while ensuring the detection efficiency.

[0023] In this embodiment, the device 100 also includes a human-computer interaction module 3 that is connected to the logic control module 2 and can display or broadcast the first information and the second information. So that the operator can easily and intuitively obtain the test results. Preferably, the human-computer interaction module 3 includes a display screen and / or a speaker. When the human-computer interaction module 3 includes a display screen, it can display specified information, i.e., the first information or the second information, under the control of the logic control module 2. When the human-computer interaction module 3 includes a speaker, the speaker can emit a specified sound under the control of the logic control module 2, for example, a continuous "beep" sound represents the first information, and an intermittent "click" sound represents the second information. It is worth noting that when the human-computer interaction module 3 includes a display screen, the display screen can also be configured to directly display the power measured by the power detection module 1 under the control of the logic control module 2, so that the operator can more intuitively obtain the power changes of the air-conditioning unit 300. Among them, the power detection module 1 is preferably a thermistor power meter, a thermocouple power meter or a crystal detector power meter connected to the control board of the air-conditioning unit 300. When the detection accuracy of the power detection module 1 is higher than 0.1w, it can improve the test accuracy of the device 100.

[0024] Next, a method 200 for detecting an electronic expansion valve 301 in an air-conditioning unit 300 according to a second embodiment of the present invention is introduced. Figure 2 As shown, method 200 mainly includes S1 and S2. Among them, S1 includes obtaining the power of the air-conditioning unit 300 during operation. S2 includes: judging whether the electronic expansion valve 301 of the air-conditioning unit 300 has performed a reset function during the startup process of the electronic expansion valve 301 based on the power of the air-conditioning unit 300, and if so, the logic control module 2 outputs a first message, and if not, the logic control module 2 outputs a second message, wherein the first message includes information that the electronic expansion valve 301 has completed the reset function normally, and the second message includes information that the electronic expansion valve 301 has not performed the reset function normally. The logic control module 2 of the device 100 of the first embodiment of the present invention is used to store a program and implement method 200 by running the program.

[0025] The method 200 for testing an electronic expansion valve in an air conditioning unit according to the second embodiment of the present invention primarily utilizes a power detection module 1 to obtain the power consumption of an air conditioning unit 300 during operation. The logic control module 2 then uses the power variation of the air conditioning unit 300 to determine whether the electronic expansion valve 301 of the air conditioning unit 300 has executed a reset function during the startup process of the electronic expansion valve 301 based on the power variation of the air conditioning unit 300. When the electronic expansion valve 301 has executed the reset function, the logic control module 2 can output a first message based on the power variation measured by the power detection module 1, thereby informing the operator that the electronic expansion valve 301 has executed the reset function and, therefore, that the electronic expansion valve 301 is of acceptable quality. When the electronic expansion valve 301 has not executed the reset function, the logic control module 2 can output a second message based on the power variation measured by the power detection module 1, thereby informing the operator that the electronic expansion valve 301 has not executed the reset function and, therefore, that the electronic expansion valve 301 is of unacceptable quality. Therefore, the method 200 for detecting the electronic expansion valve in the air-conditioning unit of the present invention can solve the problem of subjective misjudgment and missed detection in manual detection of the electronic expansion valve 301, and can eliminate the electronic expansion valve 301 damaged during the installation process in the air-conditioning unit 300, which helps to improve the yield of the electronic expansion valve 301 and even the air conditioner.

[0026] In the second embodiment, S2 also includes determining whether the power variation of the air conditioning unit 300 remains within a specified range during the startup process of the electronic expansion valve 301. If so, the determination indicates that the electronic expansion valve 301 of the air conditioning unit 300 has performed a reset function upon startup, and a first message is output to inform the operator that the electronic expansion valve 301 has performed a reset function. If not, the determination indicates that the electronic expansion valve 301 of the air conditioning unit 300 has not performed a reset function upon startup, and a second message is output to inform the operator that the electronic expansion valve 301 has not performed a reset function. Preferably, when the specified range is selected as 0.8-1.2 times the power required by the electronic expansion valve 301 to perform a reset function, the logic control module 2 can both promptly detect when the electronic expansion valve 301 has performed a reset function and eliminate errors caused by unstable power of the air conditioning unit 300, thereby helping to reduce the rate of false positives. In a more preferred embodiment, the logic control module 2 is configured to store the output first information or second information after outputting it, for easy tracing by the operator. Numerous experiments have shown that starting the air conditioning unit 300 takes 3 or 4 seconds. Therefore, the initial time point for the startup process of the electronic expansion valve 301 is selected as the 5th, 6th, or 7th second after the air conditioning unit 300 is started, especially the 6th second. This ensures detection efficiency while preventing the power change measured by the power detection module 1 from including the power change caused by the air conditioning unit 300. The power change is defined as the power of the air conditioning unit 300 after startup minus the power of the air conditioning unit 300 before startup.

[0027] To sum up, the device 100 and method 200 for detecting the electronic expansion valve in the air-conditioning unit of the present invention can solve the problem of subjective misjudgment and missed detection in manual detection of the electronic expansion valve 301, and can detect the electronic expansion valve 301 damaged during the installation process in the air-conditioning unit 300, which helps to improve the yield of the electronic expansion valve 301 and even the air conditioner.

[0028] In the description of this application, it should be understood that the terms "first," "second," etc. are used for descriptive purposes only and are not to be understood as indicating or implying relative importance or implicitly indicating the number of the technical features indicated. In the description of the present invention, "plurality" means more than two, unless otherwise specifically defined.

[0029] In this application, unless otherwise expressly specified or limited, terms such as "mounted," "connected," "connect," and "fixed" should be understood in a broad sense. For example, they may refer to fixed or detachable connections, or integration; mechanical or electrical connections; direct or indirect connections through an intermediate medium; and internal communication between two components or interaction between two components. Those skilled in the art will understand the specific meanings of the above terms in this application based on specific circumstances.

[0030] The above is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any person skilled in the art can easily make changes or modifications within the technical scope disclosed in the present invention, and such changes or modifications should be included in the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be based on the scope of protection of the claims. As long as there is no structural conflict, the various technical features mentioned in each embodiment can be combined in any way. The present invention is not limited to the specific embodiments disclosed herein, but includes all technical solutions that fall within the scope of the claims.

Claims

1. A device for detecting an electronic expansion valve in an air-conditioning unit, characterized in that: include: A power detection module, configured to be connected to the air conditioning unit and capable of obtaining the power of the air conditioning unit during operation; a logic control module connected to the power detection module, capable of determining whether the electronic expansion valve of the air-conditioning unit has performed a reset function during the startup process of the electronic expansion valve based on a power change of the air-conditioning unit, wherein the power change is equal to the power of the air-conditioning unit after the electronic expansion valve is started minus the power of the air-conditioning unit before the electronic expansion valve is started; if so, the logic control module outputs first information; if not, the logic control module outputs second information, wherein the first information includes information that the electronic expansion valve has normally completed the reset function, and the second information includes information that the electronic expansion valve has not normally performed the reset function; The logic control module is configured to determine whether the power change of the air-conditioning unit always falls within a specified range during the startup of the electronic expansion valve, and if so, determine that the electronic expansion valve of the air-conditioning unit has performed a reset function when it is started; if not, determine that the electronic expansion valve of the air-conditioning unit has not performed a reset function when it is started; The prescribed range is 0.8-1.2 times the power required by the electronic expansion valve when performing the reset function; The startup process of the electronic expansion valve takes 1-2 seconds, and the initial time point of the startup process of the electronic expansion valve is 5, 6 or 7 seconds after the air-conditioning unit is started.

2. The device according to claim 1, characterized in that It also includes a human-computer interaction module connected to the logic control module and capable of displaying or broadcasting the first information and the second information.

3. The device according to claim 2, characterized in that The human-computer interaction module includes a display screen and / or a speaker.

4. The device according to claim 1, characterized in that The power detection module includes a thermistor power meter, a thermocouple power meter or a crystal detection power meter connected to the control board of the air conditioning unit.

5. A method for detecting an electronic expansion valve in an air-conditioning unit, characterized in that: include: Obtaining the power of the air-conditioning unit during operation; determining, based on the power of the air-conditioning unit, whether the electronic expansion valve of the air-conditioning unit has performed a reset function during the startup process of the electronic expansion valve, and if so, outputting first information; if not, outputting second information, wherein the first information includes information that the electronic expansion valve has normally completed the reset function, and the second information includes information that the electronic expansion valve has not normally performed the reset function; determining whether a power change of the air-conditioning unit always falls within a specified range during the startup process of the electronic expansion valve; if so, determining that the electronic expansion valve of the air-conditioning unit has performed a reset function when it is started; if not, determining that the electronic expansion valve of the air-conditioning unit has not performed a reset function when it is started, and the power change is equal to the power of the air-conditioning unit after the electronic expansion valve is started minus the power of the air-conditioning unit before the electronic expansion valve is started; The value range of the specified range is 0.8-1.2 times the power required by the electronic expansion valve when performing the reset function. The startup process of the electronic expansion valve takes 1-2 seconds. The initial time point of the startup process of the electronic expansion valve is the 5th, 6th or 7th second after the air-conditioning unit is started.

Images