CN117490946A - Welding leakage and welding blockage detection device and method for refrigerator - Google Patents

Welding leakage and welding blockage detection device and method for refrigerator Download PDF

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Publication number
CN117490946A
CN117490946A CN202210885389.7A CN202210885389A CN117490946A CN 117490946 A CN117490946 A CN 117490946A CN 202210885389 A CN202210885389 A CN 202210885389A CN 117490946 A CN117490946 A CN 117490946A
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CN
China
Prior art keywords
detection
pipeline
welding
pipe section
gas
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Pending
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CN202210885389.7A
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Chinese (zh)
Inventor
刘华钊
杨龙
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Qingdao Haier Refrigerator Co Ltd
Haier Smart Home Co Ltd
Chongqing Haier Refrigeration Electric Appliance Co Ltd
Original Assignee
Qingdao Haier Refrigerator Co Ltd
Haier Smart Home Co Ltd
Chongqing Haier Refrigeration Electric Appliance Co Ltd
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Application filed by Qingdao Haier Refrigerator Co Ltd, Haier Smart Home Co Ltd, Chongqing Haier Refrigeration Electric Appliance Co Ltd filed Critical Qingdao Haier Refrigerator Co Ltd
Priority to CN202210885389.7A priority Critical patent/CN117490946A/en
Publication of CN117490946A publication Critical patent/CN117490946A/en
Pending legal-status Critical Current

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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
    • G01M3/00—Investigating fluid-tightness of structures
    • G01M3/02—Investigating fluid-tightness of structures by using fluid or vacuum
    • G01M3/26—Investigating fluid-tightness of structures by using fluid or vacuum by measuring rate of loss or gain of fluid, e.g. by pressure-responsive devices, by flow detectors
    • G01M3/28—Investigating fluid-tightness of structures by using fluid or vacuum by measuring rate of loss or gain of fluid, e.g. by pressure-responsive devices, by flow detectors for pipes, cables or tubes; for pipe joints or seals; for valves ; for welds
    • G01M3/2807—Investigating fluid-tightness of structures by using fluid or vacuum by measuring rate of loss or gain of fluid, e.g. by pressure-responsive devices, by flow detectors for pipes, cables or tubes; for pipe joints or seals; for valves ; for welds for pipes
    • G01M3/2815—Investigating fluid-tightness of structures by using fluid or vacuum by measuring rate of loss or gain of fluid, e.g. by pressure-responsive devices, by flow detectors for pipes, cables or tubes; for pipe joints or seals; for valves ; for welds for pipes using pressure measurements
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
    • G01M13/00—Testing of machine parts

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Examining Or Testing Airtightness (AREA)

Abstract

The invention provides a welding leakage and welding blockage detection device and method for a refrigerator. Wherein the welding leakage welding blockage detection device comprises: an air source interface; a first detection pipeline; a second detection pipeline; an air flow switching valve group; the measuring assembly is arranged on the first detection pipeline and the second detection pipeline to acquire the gas flow and the gas pressure of the first gas outlet end of the first detection pipeline and the gas flow and the gas pressure of the second gas outlet end of the second detection pipeline; and the processor is used for determining whether the welding leakage and the welding blockage exist in the target pipe section of the refrigeration loop according to the flow difference value of the detection gas between the first air outlet end of the first detection pipeline and the second air outlet end of the second detection pipeline and/or the air pressure value of the first detection pipeline or the second detection pipeline. The invention can detect whether the pipeline of the refrigerator system has welding leakage and welding blockage in a short time, and saves the cost of evacuating and filling the refrigerant.

Description

Welding leakage and welding blockage detection device and method for refrigerator
Technical Field
The invention relates to the field of refrigeration devices, in particular to a device and a method for detecting welding leakage and welding blockage of a refrigerator.
Background
The pipeline in the refrigerator can be subjected to pipeline welding leakage and welding blockage in the welding process. The welding leakage means that the welding points of the components are not welded, and the welding blockage means that molten welding liquid flows into the pipeline to cause blockage. However, the leakage and blockage of the refrigerator pipeline cannot be detected in time after the leakage and blockage of the refrigerator pipeline occur, and the temperature of the refrigerator is gradually reduced in the flowing process of the production line due to the fact that the temperature of the refrigerator is high after foaming, so that the room temperature in the measuring room of the power-on process of the production line is reduced to be qualified, and the refrigerator cannot be detected in time. However, the refrigerator with the welding leakage condition can have the condition that the refrigerant leaks in the using process, so that the refrigerator is poor in refrigeration or not in refrigeration, and the refrigerator with the welding leakage condition can have the condition that the refrigerant cannot normally circulate in a system pipeline in the using process, so that the compressor is finally burnt.
At present, an ultrasonic instrument is generally used for detecting whether the pipeline is welded with cracks and other defects, so that whether the refrigerator pipeline is welded with leakage or blocked is judged. However, the ultrasonic instrument is more precise, the refrigerator has more welding spots, if each welding spot is detected, a large amount of manpower and material resources are required, and the ultrasonic detection is not suitable for assembly line use.
Disclosure of Invention
An object of the present invention is to provide a welding leakage and blocking detection device and method suitable for a refrigerator to replace an ultrasonic instrument.
A further object of the invention is to enable the welding leakage and the welding blockage of the refrigerator to be detected in time.
In particular, the invention provides a welding leakage welding blockage detection device for a refrigerator, the refrigerator comprises a refrigeration loop, a filter and a compressor are arranged on the refrigeration loop, a target pipe section to be detected is arranged between the filter and the compressor, and the welding leakage welding blockage detection device comprises:
the air source interface is used for connecting an external air source to obtain detection air from the external air source;
the first detection pipeline is provided with a first air outlet end communicated with the compressor;
the second detection pipeline is provided with a second air outlet end communicated with the filter;
the air flow switching valve group is connected with the air source interface, the first detection pipeline and the second detection pipeline and is used for selectively supplying the detection air to the first detection pipeline or the second detection pipeline;
the measuring assembly is arranged on the first detection pipeline and the second detection pipeline to acquire the gas flow and the gas pressure of the first gas outlet end of the first detection pipeline and the gas flow and the gas pressure of the second gas outlet end of the second detection pipeline;
and the processor is used for determining whether the welding leakage and the welding blockage exist in the target pipe section of the refrigeration loop according to the flow difference value of the detection gas between the first air outlet end of the first detection pipeline and the second air outlet end of the second detection pipeline and/or the air pressure value of the first detection pipeline or the second detection pipeline.
Further, the refrigeration circuit is composed of a first pipe section and a second pipe section, wherein the first pipe section is a pipe section between the compressor and the filter and flows through a part between evaporators of the refrigerator, and the second pipe section is a pipe section between the compressor and the filter and flows through a part between condensers of the refrigerator;
the second detection pipeline is arranged to be opened when the target pipeline section is the first pipeline section, so that the detection gas enters the first pipeline section and the second pipeline section from the filter respectively, the detection gas flows to the compressor in the first pipeline section, then enters the first detection pipeline from the compressor, and the detection gas is sealed in the second pipeline section and cannot flow out.
Further, the processor is configured to determine whether the flow difference is zero when the second detection pipeline is opened, and determine that the first pipe section has no welding leakage and welding blockage when the flow difference is zero, otherwise, continuously determine whether the air pressure value of the first detection pipeline is greater than a preset air pressure value, and determine that the first pipe section has no welding leakage and welding blockage when the air pressure value is greater than the preset air pressure value, otherwise, determine that the first pipe section has welding leakage and welding blockage.
Further, the first detection pipeline is configured to be opened when the target pipe section is the second pipe section, so that the detection gas enters the first pipe section and the second pipe section from the compressor respectively, and the detection gas flows to the filter in the first pipe section and the second pipe section and then enters the second detection pipeline from the filter.
Further, the device also comprises a main pipeline for communicating with an air source, wherein the main pipeline is connected with the first detection pipeline and the second detection pipeline.
Further, the main pipeline is provided with a gas circuit switching valve, and the gas circuit switching valve is configured to enable the second detection pipeline and the first detection pipeline to be selectively opened;
optionally, the gas circuit switching valve is disposed at a junction between the main pipeline and the first and second detection pipelines.
Further, the main pipeline is provided with a gas pressure sensor, and the output end of the gas pressure sensor is connected with the processor.
In particular, the invention also discloses a welding leakage welding plug detection method for the refrigerator, which uses the welding leakage welding plug detection device for detection and comprises the following steps:
acquiring a flow value of detection gas at a first gas outlet end of a first detection pipeline of the welding leakage welding block detection device and a gas pressure value of the first detection pipeline, and acquiring a flow value of detection gas at a second gas outlet end of a second detection pipeline of the welding leakage welding block detection device and a gas pressure value of the second detection pipeline;
the flow value of the first air outlet end and the flow value of the second air outlet end are subjected to difference to obtain a flow difference value between the first air outlet end and the second air outlet end;
and determining whether a welding leakage welding blocking condition exists in a target pipe section of the refrigeration loop according to the flow difference value of the detection gas between the first air outlet end of the first detection pipeline and the second air outlet end of the second detection pipeline and/or the air pressure value of the first detection pipeline or the second detection pipeline.
Further, in the step of obtaining the flow difference between the first air outlet end and the second air outlet end by making a difference between the flow value of the first air outlet end and the flow value of the second air outlet end, the method specifically includes the following steps:
acquiring a first flow difference value between a flow value of a first air outlet end and a flow value of a second air outlet end when a target pipe section is the first pipe section, and calculating whether welding leakage exists in the first pipe section according to the first flow difference value;
and acquiring a second flow difference value between the flow value of the first air outlet end and the flow value of the second air outlet end when the target pipe section is the second pipe section, and calculating whether the second pipe section has welding leakage according to the second flow difference value and the welding leakage of the first pipe section.
Further, in the step of determining whether the target pipe section of the refrigeration circuit has a welding leakage welding blockage according to the flow difference of the detected gas between the first gas outlet end of the first detection pipeline and the second gas outlet end of the second detection pipeline and/or the air pressure value of the first detection pipeline or the second detection pipeline, the method specifically comprises the following steps:
comparing the air pressure value of the first detection pipeline with the theoretical air pressure value of the first detection pipeline, and judging whether the first pipe section has a welding blockage problem or not;
and calculating the pressure outlet value of the actual second pipe section according to the air pressure value of the first detection pipeline when the target pipe section is the first pipe section, the air pressure value of the first detection pipeline, the air pressure value of the second detection pipeline and the air pressure value of the main pipeline when the target pipe section is the second pipe section, and comparing the pressure outlet value of the actual second pipe section with the theoretical air pressure value to judge whether the second pipe section has the welding and blocking problem.
The invention discloses a welding leakage welding blockage detection device, which is designed for a refrigerator production line, wherein detection gas is controlled to enter a refrigeration loop through a filter or a compressor by a first detection pipeline and a second detection pipeline, and a processor determines whether a welding leakage welding blockage condition exists in a target pipeline section of the refrigeration loop according to a flow difference value of the detection gas between a first air outlet end of the first detection pipeline and a second air outlet end of the second detection pipeline and/or an air pressure value of the first detection pipeline or the second detection pipeline, so that whether the welding leakage and the welding blockage condition exist in a pipeline of a refrigerator system can be detected in a short time by connecting the first detection pipeline and the second detection pipeline with corresponding ports of the refrigeration loop, and vacuumizing and refrigerant filling costs are saved.
Further, in the welding leakage welding blocking detection device disclosed by the invention, the second detection pipeline is arranged to be opened when the target pipeline is the first pipeline, so that detection gas enters the first pipeline and the second pipeline respectively from the filter, the detection gas flows into the compressor in the first pipeline and then enters the first detection pipeline from the compressor, the detection gas is sealed in the second pipeline and cannot flow out, and in the opening process of the second detection pipeline, the influence of the second pipeline when the second detection pipeline is ventilated can be reduced as much as possible by a mode that the detection gas is sealed in the second pipeline and cannot flow out, so that the first detection pipeline can be specially detected when the second detection pipeline is ventilated.
Furthermore, the welding leakage welding blockage detection device disclosed by the invention is also provided with the gas path switching valve, and the gas path switching valve is convenient for switching the gas paths of the first detection pipeline and the second detection pipeline, thereby being beneficial to improving the detection efficiency.
The above, as well as additional objectives, advantages, and features of the present invention will become apparent to those skilled in the art from the following detailed description of a specific embodiment of the present invention when read in conjunction with the accompanying drawings.
Drawings
Some specific embodiments of the invention will be described in detail hereinafter by way of example and not by way of limitation with reference to the accompanying drawings. The same reference numbers will be used throughout the drawings to refer to the same or like parts or portions. It will be appreciated by those skilled in the art that the drawings are not necessarily drawn to scale. In the accompanying drawings:
fig. 1 is a schematic view of an actual use situation of a welding leakage and blocking detection device for a refrigerator according to an embodiment of the present invention;
FIG. 2 is a schematic structural view of the welding leakage and blocking detection device for the refrigerator shown in FIG. 1;
FIG. 3 is a schematic circuit diagram of a sensor component connection processor of the welding leakage and blockage detection device for the refrigerator shown in FIG. 1;
fig. 4 is a flowchart of a welding leakage and blocking detection method for a refrigerator according to an embodiment of the present invention.
Detailed Description
Fig. 1 is a schematic structural view of a refrigerating circuit in which a welding flux leakage detection device for a refrigerator is mounted to the refrigerator according to one embodiment of the present invention. As shown in fig. 1, the refrigeration circuit of the refrigerator includes a compressor 201, a condenser 205, a filter 204, a capillary tube 203, the capillary tube 203 and an evaporator 202 connected in a circuit, wherein the compressor 201 is provided with three pipes of an exhaust pipe, an intake pipe and a compressor process pipe, the exhaust pipe and the intake pipe are used for connecting the pipes of the refrigeration circuit, the compressor process pipe is used for filling the refrigerant when the compressor 201 is produced or maintained, and the end of the refrigerant after filling is closed by gas welding and is opened when needed, so that the compressor process pipe is still in an open state in the embodiment.
The filter 204 is provided with three pipes of an air inlet pipe, an air outlet pipe and a filter process pipe, wherein the air inlet pipe and the air outlet pipe are used for connecting the pipes of the refrigerating circuit, the filter process pipe is used for vacuumizing during production or maintenance of the filter 204, the tail end of the vacuumized filter process pipe is sealed through gas welding and is opened when needed, and therefore the filter process pipe is still in an open state in the embodiment.
The welding leakage welding blocking detection device generally comprises an air source connector, a first detection pipeline, a second detection pipeline, an air flow switching valve group and a measurement assembly, wherein the air source connector is used for being connected with an external air source to obtain detection air from the external air source, the first detection pipeline is provided with a first air outlet end communicated with a compressor, the second detection pipeline is provided with a second air outlet end communicated with a filter, the air flow switching valve group is connected with the air source connector, the first detection pipeline and the second detection pipeline and used for selectively supplying the detection air to the first detection pipeline or the second detection pipeline, the measurement assembly is arranged on the first detection pipeline and the second detection pipeline to obtain the air flow and the air pressure of the first air outlet end of the first detection pipeline and the air flow and the air pressure of the second air outlet end of the second detection pipeline, and the processor is used for determining whether a welding leakage welding blocking condition exists in a target pipe section of a refrigeration loop according to the air pressure value of the first detection pipeline or the second detection pipeline.
It will be appreciated that the first sensing line 101 communicates with the refrigeration circuit through the compressor process line and the second sensing line communicates with the refrigeration circuit through the filter process line. According to the welding leakage welding blocking detection device disclosed by the embodiment, aiming at the refrigerator production line design, the first detection pipeline 101 and the second detection pipeline 102 are used for controlling detection gas to enter a refrigeration loop through the filter 204 or the compressor 201, and the processor 7 determines whether the welding leakage welding blocking condition exists in a target pipe section of the refrigeration loop according to the flow difference of the detection gas between the first air outlet end of the first detection pipeline 101 and the second air outlet end of the second detection pipeline 102 and/or the air pressure value of the first detection pipeline 101 or the second detection pipeline 102, so that whether the welding leakage and the welding blocking condition exist in a pipeline of a refrigerator system can be detected in a short time by connecting the first detection pipeline and the second detection pipeline with corresponding ports of the refrigeration loop, and vacuumizing and refrigerant filling cost are saved.
In accordance with one embodiment of the present invention, the refrigeration circuit is described in detail herein for ease of description of the target piping section. The refrigeration circuit comprises a compressor 201, a condenser 205, a filter 204, a capillary tube 203, the capillary tube 203 and an evaporator 202 connected in series in a circuit, and since the compressor 201 has a suction valve and a discharge valve, the discharge valve of the compressor 201 can prevent the reverse flow of gas, the line through the discharge valve of the compressor 201 cannot reverse flow. In the whole refrigeration loop on the production line, two gas exchange ports of a compressor process pipe and a filter process pipe are arranged in total, and then two gas paths from the compressor process pipe to the filter process pipe can reach, namely a first pipe section and a second pipe section, wherein the first pipe section finally reaches the filter process pipe through the compressor process pipe, a compressor 201 air suction pipe, an evaporator 202, a capillary 203 and a filter 204, and the second pipe section finally reaches the filter process pipe through the compressor process pipe, a compressor 201 silencer, a compressor 201 air suction valve plate, a compressor 201 cylinder, a compressor 201 air discharge valve plate, a compressor 201 exhaust pipe, a condenser 205 and the filter 204. Wherein the direction of gas travel in the first tube section is reversible and the second tube section is irreversible.
According to one embodiment of the present invention, the first detection pipeline 101 and the second detection pipeline 102 are pipes with the same pipe diameter. When the air outlet ends of the first detection pipeline 101 and the second detection pipeline 102 are communicated to the refrigeration circuit, air can pass through the first detection pipeline 101 to the target pipeline section of the refrigeration circuit and then be discharged by the second detection pipeline 102, and can also pass through the first detection pipeline 101 to the target pipeline section of the refrigeration circuit and then be discharged by the first detection pipeline 101, so that in the embodiment, the cross-sectional areas of the air flowing in the pipe fittings are equal when the first detection pipeline 101 and the second detection pipeline 102 adopt pipe fittings with the same pipe diameters, the flow rates of the air flowing in the pipe fittings are equal when the target pipeline section is not leaked, and according to the calculation method of the flow rates of the air of the pipelines, the flow rates of the air in the first detection pipeline 101 and the flow rates of the air in the second detection pipeline 102 are equal, and therefore the detection devices arranged in the first detection pipeline 101 and the second detection pipeline 102 can calculate the flow rates of the air through detecting the flow rates.
In order to facilitate the injection of gas into the refrigeration circuit using the first detection line 101 or the second detection line 102 according to one embodiment of the present invention, a main line 100 is further provided in this embodiment, one end of the main line 100 is connected to the gas source 1, and the other end of the main line 100 is connected to the first detection line 101 or the second detection line 102, so that the first detection line 101 or the second detection line 102 can obtain a gas flow from the main line 100 and introduce the gas flow into the refrigeration circuit. The main line 100 is selectively connected to the first test line and the second test line 102 by a clamp connection. Specifically, the end of the main pipeline 100 and the first detection pipeline 101 may be connected through a clamp, so that the main pipeline 100 and the first detection pipeline 101 are communicated, at this time, the second detection pipeline 102 cannot be communicated with the end of the main pipeline 100, the end of the main pipeline 100 and the second detection pipeline 102 may be connected through the clamp, so that the main pipeline 100 and the second detection pipeline 102 are communicated, at this time, the first detection pipeline 101 cannot be communicated with the end of the main pipeline 100.
According to an embodiment of the present invention, in order to selectively communicate between the main line 100 and the second detection line 102 of the first detection line 101 and to improve the convenience of such connection, the main line 100 and the first detection line 101, and the main line 100 and the second detection line 102 are connected through valves, so that when the valve between the main line 100 and the first detection line 101 is opened, the valve between the main line 100 and the second detection line 102 may be closed, and when the valve between the main line 100 and the first detection line 101 is closed, the valve between the main line 100 and the second detection line 102 may be opened, thereby achieving the selective opening between the first detection line 101 and the second detection line 102.
According to an embodiment of the present invention, in order to selectively communicate the main line 100 with the first detection line 101, the main line 100 with the second detection line 102, the end of the main line 100, one end of the first detection line 101 and one end of the second detection line 102 are communicated through the gas path switching valve 4. It can be understood that the gas circuit switching valve 4 is a multi-way valve, and when two ports of the gas circuit switching valve 4 are communicated, a third port of the gas circuit switching valve can be communicated with other ports, so that a pipeline connected to the third port is communicated with the outside, and the description of the prior art can be omitted herein.
According to one embodiment of the present invention, the main pipeline 100 is further provided with a gas pressure sensor 3, the gas pressure sensor 3 is configured to obtain the gas pressure in the main pipeline 100, and the main pipeline 100 is further provided with a dry filter 2, and the dry filter 2 is arranged in front of the gas pressure sensor 3 to filter the gas in the gas source 1 communicated with the main pipeline 100, so that impurities in the gas are reduced, and measurement accuracy is improved.
According to one embodiment of the present invention, the first gas sensor 51 is disposed in the first detection pipeline 101, and the second gas sensor 52 is disposed in the second detection pipeline 102, so that the gas flow data and the gas pressure data can be directly acquired, wherein the first gas sensor 51 and the second gas sensor 52 respectively acquire the gas flow in the pipeline. It will be appreciated that the first gas sensor 51 and the second gas sensor 52 are of the same type.
According to one embodiment of the invention, the first gas sensor 51 and the second gas sensor 52 are both pipe gas sensors. The pipeline gas sensor obtains the gas flow by measuring and calculating the gas flow rate, the output voltage signal is a voltage signal proportional to the gas flow rate, and then the processor 7 calculates a specific gas flow value according to the voltage signal. It will be appreciated that such sensors are typically attached to the pipe using a threaded connection. In addition to measuring wind speed, the first gas sensor 51 and the second gas sensor 52 integrate a function of measuring gas pressure.
According to one embodiment of the present invention, the pipe diameters of the main pipe 100 and the first and second test pipes 101 and 102 are identical, so that the pipe diameters selected for the main pipe 100, the first and second test pipes 101 and 102 do not need to be distinguished during the manufacturing process, thereby facilitating the manufacturing. When the main pipeline 100 is communicated with the first detection pipeline 101 or the second detection pipeline 102, the gas flows smoothly because the pipe diameters are the same.
According to one embodiment of the present invention, a first valve 61 is disposed at one end of the first detection pipeline 101, which communicates with the refrigeration circuit (i.e., the first air outlet end of the first detection pipeline 101), and a second valve 62 is disposed at one end of the second detection pipeline 102, which communicates with the refrigeration circuit (i.e., the second air outlet end of the second detection pipeline 102), and the first detection pipeline 101 and the second detection pipeline 102 communicate with the refrigeration pipeline through the valves. More specifically, the first detection pipeline 101 is communicated with the compressor process pipe through a valve, the second detection pipeline 102 is communicated with the filter process pipe through a valve, the valve connection method is adopted according to the detection requirement of a refrigerator production line, a plurality of refrigeration pipelines are usually required to be continuously detected on the refrigerator production line, and the valve is used for communicating the first detection pipeline 101 with the refrigeration pipeline or the second detection pipeline 102 with the refrigeration pipeline, so that batch detection of the refrigeration pipelines on the refrigerator production line is facilitated.
In particular, the invention also discloses a welding leakage welding plug detection method for the refrigerator, which comprises the following steps:
s1, acquiring a flow value of detection gas at a first air outlet end of a first detection pipeline of the welding leakage welding plug detection device and an air pressure value of the first detection pipeline, and acquiring a flow value of detection gas at a second air outlet end of a second detection pipeline of the welding leakage welding plug detection device and an air pressure value of the second detection pipeline.
S2, the flow value of the first air outlet end and the flow value of the second air outlet end are subjected to difference, and a flow difference value between the first air outlet end and the second air outlet end is obtained.
S3, determining whether a welding leakage welding blockage exists in a target pipe section of the refrigeration loop according to a flow difference value of detection gas between a first gas outlet end of the first detection pipeline and a second gas outlet end of the second detection pipeline and/or a gas pressure value of the first detection pipeline or the second detection pipeline.
According to one embodiment of the invention, step S1 comprises in particular the steps of:
s11, obtaining a first flow difference value between the flow value of the first air outlet end and the flow value of the second air outlet end when the target pipe section is the first pipe section.
S12, obtaining a second flow difference value between the flow value of the first air outlet end and the flow value of the second air outlet end when the target pipe section is the second pipe section.
According to one embodiment of the present invention, in step S11, in order to obtain the measurement result of only the first pipe section, the detection gas is introduced from the filter 204 into the first pipe section and the second pipe section, respectivelyIn the process of the section, a method for controlling the inlet time of the detection gas is adopted, so that the detection gas is sealed in the second pipe section and cannot flow out, and the air pressure in the second pipe section is enabled to reach a state of not affecting the air flow circulation of the first pipe section. Specifically, after the filter 204 is filled with the detection gas, at the t-th 1 The air pressure in the second pipe section is not changed after the time point, at t 2 Ending ventilation at time point, taking t 1 ～t 2 Relevant measurements at time points. For example, the filter 204 takes a total of 4 seconds for the detection gas to be introduced, and the measurement result is taken between the 2 nd and 4 th seconds. For comparison, in step S2, the measurement gas is also introduced for the same time, also t 1 ～t 2 Relevant measurements at time points.
According to an embodiment of the present invention, in step S11, when the target pipe section is the first pipe section, the main pipe is connected to the second detection pipeline 102, the main pipe is connected to the gas source 1, the gas is ventilated to the filter process pipe through the main pipe and the second detection pipeline 102, and the gas sensor in the first detection pipeline 101 monitors the gas flow flowing out of the compressor process pipe, so that the welding leakage and the welding blockage of the first pipe section can be detected.
According to one embodiment of the present invention, in step S12, the direction of the gas path in step S11 is reversed, the manifold is connected to the first detection pipeline 101, and the gas is vented to the compressor process pipe via the manifold and the first detection pipeline 101, and at this time, the first pipe section and the second pipe section are both in a connected state, and since the welding leakage condition of the first pipe section has been determined in step S11, the welding leakage condition of the second pipe section can be determined in step S12 by measuring the outflow flow of the filter process pipe.
According to one embodiment of the invention, step S2 comprises the steps of:
s21, obtaining a first flow difference value between a flow value of a first air outlet end and a flow value of a second air outlet end when a target pipe section is the first pipe section, and calculating whether welding leakage exists in the first pipe section according to the first flow difference value.
S22, obtaining a second flow difference value between the flow value of the first air outlet end and the flow value of the second air outlet end when the target pipe section is the second pipe section, and calculating whether the second pipe section has welding leakage according to the second flow difference value and the welding leakage of the first pipe section.
According to one embodiment of the present invention, the welding leakage and the welding blockage of the first detection pipeline 101 and the second detection pipeline 102 can be judged through the difference of the air pressure and the flow rate of the air inlet and outlet (at the compressor process pipe and at the filter process pipe). Specifically, if the gas inlet and outlet flows are unequal, the pipeline is judged to have leakage, if the gas inlet and outlet flows are equal, but the exhaust pressure is different from the normal exhaust pressure of the refrigerator model, the refrigerator is judged to have blockage, if the air pressure difference is not great at this time, the refrigerator is judged to be qualified, if the air pressure difference is great at this time, but the gas outlet is exhausted, the refrigerator is judged to have half blockage, and if the gas outlet is not exhausted, the refrigerator is indicated to have welding blockage.
In accordance with one embodiment of the present invention, upon performing a specific operation, in step S21, the first sensing line 101 is docked to the compressor process tube, the second sensing line 102 is docked to the filter process tube, and measurement is started. First, compressed gas is continuously introduced into the second detection pipeline 102 for 4 seconds, and the flow m of the first detection pipeline 101 is measured by the first gas sensor 51 Compressor 1 The flow m of the second detection line 102 is measured by the second gas sensor 52 Filter 1 And the air pressure P of the main pipeline 100 is measured by the air pressure sensor 3 Main 1 The air pressure P of the first detection pipeline 101 is measured by the first air sensor 51 Compressor 1 The air pressure P of the second detection pipeline 102 is measured by the second air sensor 52 Filter 1 Then, step S3 is performed, if m Compressor 1 ＝m Filter 1 Judging that the first pipe section is free of leakage, thereby deducing that the first pipe section is free of welding leakage, otherwise if m Compressor 1 ≠m Filter 1 And judging that the welding leakage problem occurs in the first pipe section. If P Compressor 1 ＞aP Compressor 0 (a is a set value, and is input according to the conditions of field process and the like, and the range is between 0.8 and 0.95), judging that the air path flow is abnormal, if P Compressor 1 <aP Compressor 0 Judging that the welding and blocking problem affects refrigeration and needs to be repaired, wherein P is Compressor 0 The theoretical calculation value is related to the supply gas pressure and the refrigerator model, and is obtained through computer simulation operation, and the specific calculation process is well known to those skilled in the art and is not described herein.
According to one embodiment of the present invention, after the step S1 is performed, the gas path switching valve 4 is controlled, the step S2 is performed, the compressed gas is continuously introduced into the first detection pipeline 101, the gas is introduced into the refrigeration pipeline from the compressor 201 for 4 seconds, and at this time, the flow m of the first detection pipeline 101 is measured by the first gas sensor 51 Compressor 2 The flow m of the second detection line 102 is measured by the second gas sensor 52 Filter 2 The air pressure P of the main pipeline 100 paths is measured by the air pressure sensor 3 Main 2 Measuring the air pressure P of the first detection pipeline 101 by the first air sensor 51 Compressor 2 Measuring the air pressure P of the second detection line 102 by the second air sensor 52 Filter 2 If m Compressor 2 ＝m Filter 2 If the second pipe section is free of leakage, then deducing that no welding leakage condition of the second pipe section occurs at the moment, otherwise if m Compressor 2 ≠m Filter 2 And judging that the second pipe section has leakage problem. P obtained from the first test Compressor 1 And P Compressor 0 The approximate value of the pressure drop of the ventilation pressure to the process pipe of the compressor in the first pipe section can be calculated, which provides the state parameter of the first pipe section for the calculation, thereby combining the simulation calculation to obtain the P of the second pipe section Compressor 0 The parameter P Compressor 0 Related to the supply gas, the refrigerator model, and varying with the condition of the second pipe section, the parameter P Compressor 0 The specific calculation process is well known to those skilled in the art, and is not described herein. Comparative P Filter 2 The pressure outlet value P of the actual second pipe section can be calculated 3 If P 3 ＞aP Compressor 0 Judging the second pipe section to be qualified, if P 3 ＜aP Compressor 0 The second pipe section is askedThe problem is that the blockage affects refrigeration and needs to be repaired.
Regarding P 3 It will be appreciated that in the above steps, the measured P Filter 2 The air pressure of the first pipe section and the second pipe section are included simultaneously, and the air pressure of the second pipe section cannot be reacted alone, so that the actual pressure outlet value P of the second pipe section needs to be calculated in the embodiment 3 . Calculation of P 3 When the pressure of the second pipe section is reversely pushed out, the air flow of the second pipe section is determined. Specifically, the air flow m of the first pipe section is measured in step S1 Compressor 1 And air pressure P Compressor 1 Flow m of the second pipe section 3 ＝m Filter 2 -m Compressor 1 The flow m of the second pipe section 3 Taking Bernoulli equation, making the height difference be zero and making the gas density be identical, then calculating P 3 And will not be described in detail herein.
By now it should be appreciated by those skilled in the art that while a number of exemplary embodiments of the invention have been shown and described herein in detail, many other variations or modifications of the invention consistent with the principles of the invention may be directly ascertained or inferred from the present disclosure without departing from the spirit and scope of the invention. Accordingly, the scope of the present invention should be understood and deemed to cover all such other variations or modifications.

Claims (10)

1. The utility model provides a leak welding detection device for refrigerator, a serial communication port, the refrigerator includes refrigeration circuit, be provided with filter and compressor on the refrigeration circuit, be the target pipeline section that needs to detect between filter and the compressor, leak welding detection device includes:
the air source interface is used for connecting an external air source to obtain detection air from the external air source;
the first detection pipeline is provided with a first air outlet end communicated with the compressor;
the second detection pipeline is provided with a second air outlet end communicated with the filter;
the air flow switching valve group is connected with the air source interface, the first detection pipeline and the second detection pipeline and is used for selectively supplying the detection air to the first detection pipeline or the second detection pipeline;
the measuring assembly is arranged on the first detection pipeline and the second detection pipeline to acquire the gas flow and the gas pressure of the first gas outlet end of the first detection pipeline and the gas flow and the gas pressure of the second gas outlet end of the second detection pipeline;
and the processor is used for determining whether the welding leakage and the welding blockage exist in the target pipe section of the refrigeration loop according to the flow difference value of the detection gas between the first air outlet end of the first detection pipeline and the second air outlet end of the second detection pipeline and/or the air pressure value of the first detection pipeline or the second detection pipeline.
2. The welding leakage and welding blockage detection device according to claim 1, wherein the refrigeration circuit is composed of a first pipe section and a second pipe section, the first pipe section is a pipe section between the compressor and the filter and flowing between evaporators of the refrigerator, and the second pipe section is a pipe section between the compressor and the filter and flowing between condensers of the refrigerator;
the second detection pipeline is arranged to be opened when the target pipeline section is the first pipeline section, so that the detection gas enters the first pipeline section and the second pipeline section from the filter respectively, the detection gas flows to the compressor in the first pipeline section, then enters the first detection pipeline from the compressor, and the detection gas is sealed in the second pipeline section and cannot flow out.
3. The welding leakage and welding blockage detection device according to claim 2, wherein the processor is configured to determine whether the flow difference is zero when the second detection pipeline is opened, and determine that the welding leakage and welding blockage condition does not exist in the first pipe section when the flow difference is zero, otherwise, continuously determine whether an air pressure value of the first detection pipeline is greater than a preset air pressure value, and determine that the welding leakage and welding blockage condition does not exist in the first pipe section when the air pressure value is greater than the preset air pressure value, otherwise, determine that the welding leakage and welding blockage condition exists in the first pipe section.
4. The welding leakage and plugging detection device according to claim 2, wherein the first detection line is configured to open when the target pipe section is the second pipe section, such that the detection gas enters the first pipe section and the second pipe section from the compressor, respectively, such that the detection gas flows within the first pipe section and the second pipe section to the filter, and then enters the second detection line from the filter.
5. The welding leakage and plugging detection device according to claim 1, further comprising a main pipeline for communicating with a gas source, the main pipeline connecting the first detection pipeline and the second detection pipeline.
6. The welding leakage and welding blockage detection device according to claim 5, wherein a gas path switching valve is arranged on the main pipe, and the gas path switching valve is configured to enable the second detection pipe and the first detection pipe to be selectively opened;
optionally, the gas circuit switching valve is disposed at a junction between the main pipeline and the first and second detection pipelines.
7. The welding leakage and plugging detection device according to claim 5, wherein the main pipeline is provided with a gas pressure sensor, and an output end of the gas pressure sensor is connected with the processor.
8. A method for detecting a leak welding plug for a refrigerator, characterized by using the leak welding plug detection device according to any one of claims 1 to 7, comprising the steps of:
acquiring a flow value of detection gas at a first gas outlet end of a first detection pipeline of the welding leakage welding block detection device and a gas pressure value of the first detection pipeline, and acquiring a flow value of detection gas at a second gas outlet end of a second detection pipeline of the welding leakage welding block detection device and a gas pressure value of the second detection pipeline;
the flow value of the first air outlet end and the flow value of the second air outlet end are subjected to difference to obtain a flow difference value between the first air outlet end and the second air outlet end;
and determining whether a welding leakage welding blocking condition exists in a target pipe section of the refrigeration loop according to the flow difference value of the detection gas between the first air outlet end of the first detection pipeline and the second air outlet end of the second detection pipeline and/or the air pressure value of the first detection pipeline or the second detection pipeline.
9. The method of claim 8, wherein the refrigeration circuit is comprised of a first tube segment and a second tube segment, the first tube segment being a tube segment between the compressor and the filter and passing between evaporators of the refrigerator, the second tube segment being a tube segment between the compressor and the filter and passing between condensers of the refrigerator;
in the step of obtaining the flow difference between the first air outlet end and the second air outlet end by making a difference between the flow value of the first air outlet end and the flow value of the second air outlet end, the method specifically comprises the following steps:
acquiring a first flow difference value between a flow value of a first air outlet end and a flow value of a second air outlet end when a target pipe section is the first pipe section, and calculating whether welding leakage exists in the first pipe section according to the first flow difference value;
and acquiring a second flow difference value between the flow value of the first air outlet end and the flow value of the second air outlet end when the target pipe section is the second pipe section, and calculating whether the second pipe section has welding leakage according to the second flow difference value and the welding leakage of the first pipe section.
10. The method according to claim 9, wherein in the step of determining whether the target pipe section of the refrigeration circuit has a welding-missing condition according to a flow rate difference of the detection gas between the first outlet end of the first detection pipe and the second outlet end of the second detection pipe and/or a gas pressure value of the first detection pipe or the second detection pipe, the method specifically comprises the steps of:
comparing the air pressure value of the first detection pipeline with the theoretical air pressure value of the first detection pipeline, and judging whether the first pipe section has a welding blockage problem or not;
and calculating the pressure outlet value of the actual second pipe section according to the air pressure value of the first detection pipeline when the target pipe section is the first pipe section, the air pressure value of the first detection pipeline, the air pressure value of the second detection pipeline and the air pressure value of the main pipeline when the target pipe section is the second pipe section, and comparing the pressure outlet value of the actual second pipe section with the theoretical air pressure value to judge whether the second pipe section has the welding and blocking problem.
CN202210885389.7A 2022-07-26 2022-07-26 Welding leakage and welding blockage detection device and method for refrigerator Pending CN117490946A (en)

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Application Number Priority Date Filing Date Title
CN202210885389.7A CN117490946A (en) 2022-07-26 2022-07-26 Welding leakage and welding blockage detection device and method for refrigerator

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202210885389.7A CN117490946A (en) 2022-07-26 2022-07-26 Welding leakage and welding blockage detection device and method for refrigerator

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