CN114041047A - Multi-inspection and multi-step gas leak defect inspection system - Google Patents
Multi-inspection and multi-step gas leak defect inspection system Download PDFInfo
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- CN114041047A CN114041047A CN202080047819.7A CN202080047819A CN114041047A CN 114041047 A CN114041047 A CN 114041047A CN 202080047819 A CN202080047819 A CN 202080047819A CN 114041047 A CN114041047 A CN 114041047A
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- 238000007689 inspection Methods 0.000 title claims abstract description 245
- 230000007547 defect Effects 0.000 title claims abstract description 88
- 238000009530 blood pressure measurement Methods 0.000 claims description 36
- 238000005259 measurement Methods 0.000 claims description 33
- 238000012360 testing method Methods 0.000 description 11
- 238000010586 diagram Methods 0.000 description 9
- 238000000034 method Methods 0.000 description 9
- 230000000694 effects Effects 0.000 description 5
- 238000001816 cooling Methods 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- 238000011144 upstream manufacturing Methods 0.000 description 3
- 230000007423 decrease Effects 0.000 description 2
- 239000003507 refrigerant Substances 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 230000005856 abnormality Effects 0.000 description 1
- 230000002950 deficient Effects 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B49/00—Control, e.g. of pump delivery, or pump pressure of, or safety measures for, machines, pumps, or pumping installations, not otherwise provided for, or of interest apart from, groups F04B1/00 - F04B47/00
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K11/00—Multiple-way valves, e.g. mixing valves; Pipe fittings incorporating such valves
- F16K11/10—Multiple-way valves, e.g. mixing valves; Pipe fittings incorporating such valves with two or more closure members not moving as a unit
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K37/00—Special means in or on valves or other cut-off apparatus for indicating or recording operation thereof, or for enabling an alarm to be given
-
- 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
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Abstract
The present invention relates to a gas leakage defect inspection system, which is formed to supply compressed air to an inspection object without recovering, and can connect a plurality of inspection objects in parallel through a plurality of manifolds, thereby simultaneously inspecting the plurality of inspection objects for the existence of gas leakage defects at one inspection operation, and can inspect the plurality of inspection objects in a plurality of target pressure states in consideration of the use environment of the inspection object instead of one target pressure state when inspecting the gas leakage of the inspection object, thereby more accurately inspecting, and can specify the sequence of the target pressure, so that the compressed air in the plurality of target pressure states can be smoothly supplied, and the actual use environment of the inspection object can be more accurately simulated, the accuracy of the gas leakage inspection result can thereby be improved, and the inspection accuracy can be further improved by repeating the inspection cycle of one time of automatically performing inspection with a plurality of target pressure states.
Description
Technical Field
The present invention relates to a gas leakage defect inspection system, and more particularly, to a gas leakage defect inspection system which is configured to supply compressed air only to an inspection object without being recovered, can simultaneously inspect a plurality of inspection objects for the presence of a gas leakage defect at one inspection operation by connecting the plurality of inspection objects in parallel through a plurality of manifolds, can inspect the plurality of inspection objects in a plurality of target pressure states in consideration of the use environment of the inspection object instead of performing the inspection operation in one target pressure state when inspecting the inspection object for gas leakage, can inspect the inspection objects in a plurality of target pressure states more accurately, can specify the order of the target pressures, can smoothly supply compressed air in a plurality of target pressure states, and can more accurately copy the actual use environment of the inspection object, the accuracy of the gas leakage inspection result can thereby be improved, and the inspection accuracy can be further improved by repeating the inspection cycle of one time of automatically performing inspection with a plurality of target pressure states.
Background
In general, various manufacturing plants and the like are provided with various devices for supplying gas, and it is very important that such gas devices maintain a sealed state in order to prevent leakage of gas.
In addition to gas equipment used in such manufacturing plants and the like, cooling devices such as air conditioners and refrigerators widely used in vehicles, homes, offices and the like are also supplied with refrigerant gas in a circulating manner, and therefore, it is also very important for such cooling devices to maintain a sealed state for preventing leakage of the refrigerant gas.
As such, in various apparatuses using gas, sealing performance for preventing gas leakage is very important, and thus it is necessary to continuously check whether gas leaks from the apparatus periodically or when an operation abnormality occurs.
Generally, the equipment for checking whether gas leaks or not is configured to connect an inspection object on a gas flow line that supplies and recovers test gas so that the test gas passes through the inspection object and is recovered again, and is performed in such a manner that a pressure difference between them is checked at a front end and a rear end of the inspection object, that is, at a supply port portion of the test gas and a recovery port portion of the test gas, or the inspection object is put into water in this state to visually check whether bubbles are generated.
In this way, since the inspection target is inspected for a gas leak defect state by supplying and recovering the test gas to and from the inspection target, only one inspection target can be inspected by one gas leak defect inspection equipment, and there is a problem that a long time is required for inspecting a plurality of inspection targets. Further, since the inspection work is performed so as to visually observe the generation of bubbles, there is a problem that the inspection accuracy is significantly lowered.
Meanwhile, depending on the kind of the inspection object, it is necessary to further increase the supply pressure of the test gas or to perform the inspection work at different pressures from each other, and in order to supply the high-pressure test gas, it is necessary to increase the size of the supply equipment of the test gas, and therefore, there are problems in that the manufacturing cost is increased due to the increase in the size of the gas leakage defect inspection equipment as a whole, the field inspection cannot be performed due to difficulty in transportation, and the supply pressure of the test gas cannot be adjusted, and thus, the application to various equipment and the like is not possible.
Further, since the gas equipment as the inspection object is used not only in a specific pressure state but in various pressure states in the actual usage environment, there is a problem that, when the test is performed only in the specific pressure state in the process of testing whether or not there is a gas leakage defect, it is impossible to accurately judge whether or not the gas leaks in the actual usage environment with respect to the inspection object.
Disclosure of Invention
Technical problem
The present invention has been made to solve the problems of the prior art, and an object of the present invention is to provide a gas leakage defect inspection system in which a plurality of inspection objects can be connected in parallel by a plurality of manifolds by a configuration in which only compressed air is supplied to the inspection objects and is not recovered, thereby simultaneously inspecting the plurality of inspection objects for the presence or absence of a gas leakage defect in one inspection operation.
Another object of the present invention is to provide a gas leakage defect inspection system, in which a temperature/humidity sensor capable of detecting the temperature and humidity of compressed air supplied to an inspection object is mounted, and whether a pressure variation measured by a pressure measurement sensor is affected by the temperature and humidity or due to a gas leakage defect can be verified in consideration of the measurement value of the temperature/humidity sensor, thereby correcting or verifying the result of determination as to whether the inspection object has a gas leakage defect.
It is still another object of the present invention to provide a gas leakage defect inspection system including a pressurizing module capable of pressurizing a pressure of compressed air supplied to an inspection object, and capable of selectively supplying pressurized compressed air to the inspection object, so that compressed air having different supply pressures can be supplied to the inspection object by one equipment, and thus, the system can be applied to inspection objects having various specifications.
It is still another object of the present invention to provide a gas leakage defect inspection system that can perform inspection in a plurality of target pressure states in consideration of the usage environment of an inspection target, instead of performing inspection work in one target pressure state when inspecting a gas leakage from the inspection target, thereby enabling inspection to be performed more accurately, and that can specify the order of target pressures, so that compressed air in a plurality of target pressure states can be smoothly supplied, and the actual usage environment of the inspection target can be more accurately copied, thereby enabling the accuracy of the gas leakage inspection result to be improved.
It is still another object of the present invention to provide a gas leakage defect inspection system which can further improve inspection accuracy by repeating an inspection cycle of one time of automatically performing inspection in a plurality of target pressure states.
It is still another object of the present invention to provide a gas leak defect inspection system capable of simultaneously inspecting a plurality of inspection objects, and even when it is determined that a gas leak defect exists in one of the inspection objects, the inspection of the remaining inspection objects can be continued, and the inspection work can be performed more quickly on the plurality of inspection objects.
Technical scheme
The present invention provides a gas leakage defect inspection system that connects an inspection object in which a gas flow path is formed and inspects the inspection object for a gas leakage defect, the gas leakage defect inspection system including: an air supply module that supplies compressed air; a first regulator that is disposed downstream of the air supply module in such a manner as to pass compressed air supplied by the air supply module and that constantly adjusts the pressure of the compressed air to a first reference pressure state; a multi-manifold in which one inflow port is formed to allow the compressed air having passed through the first regulator to flow into the interior thereof, and a plurality of discharge ports are formed to discharge the compressed air flowing into the interior thereof; a plurality of supply lines, one end of each of which is connected to the plurality of discharge ports of the multi-manifold and the other end of each of which is connectable to the inspection object; opening and closing valves respectively installed on the plurality of supply lines; pressure measurement sensors connected to the plurality of supply lines at positions downstream of the position of the on-off valve, respectively, and measuring internal pressures of the plurality of supply lines, respectively; and a control unit that controls operations of the air supply module and the on-off valve, wherein the control unit applies measurement values of the plurality of pressure measurement sensors, and determines whether or not a gas leakage defect exists in each of the plurality of inspection objects connected to the plurality of supply lines, respectively, based on a change amount with time of the applied measurement values.
In this case, the control unit may open the on-off valve until the measurement value of the pressure measurement sensor reaches the first reference pressure state, and close the on-off valve when the measurement value of the pressure measurement sensor reaches the first reference pressure state, and the control unit may calculate a variation in the measurement value of the pressure measurement sensor in a reference time in a state where the on-off valve is closed, and determine that the inspection target has the gas leakage defect when the calculated variation in the measurement value is equal to or greater than a preset reference variation.
Further, the present invention provides a gas leakage defect inspection system for connecting an inspection object having a gas flow path formed therein and inspecting the inspection object for a gas leakage defect, the gas leakage defect inspection system including: a compressed air supply unit that generates and supplies compressed air; a multi-manifold in which one inflow port is formed so that the compressed air supplied from the compressed air supply unit flows in, and a plurality of discharge ports are formed so that the compressed air flowing into the inside is discharged; a plurality of supply lines, one end of each of which is connected to the plurality of discharge ports of the multi-manifold and the other end of each of which is connectable to the inspection object; opening and closing valves respectively installed on the plurality of supply lines; pressure measurement sensors connected to the plurality of supply lines at positions downstream of the position of the on-off valve, respectively, and measuring internal pressures of the plurality of supply lines, respectively; a pressure setting portion formed to be able to input at least one of a main target pressure and an auxiliary target pressure for the compressed air, the auxiliary target pressure being a pressure different from the main target pressure; and a control unit that controls operations of the compressed air supply unit and the opening/closing valve to supply compressed air in a state of the main target pressure and the auxiliary target pressure to the inspection object, respectively, based on an input signal of the pressure setting unit, wherein the control unit applies measured values of the plurality of pressure measurement sensors for each supply state in a state of supplying compressed air to the inspection object in a state of the main target pressure and the auxiliary target pressure, respectively, and determines whether or not there is a gas leakage defect in each of the plurality of inspection objects connected to the plurality of supply lines, respectively, based on a change amount with time of the applied measured values.
In this case, the control unit may open the on-off valve in the supply line until the measurement value of the pressure measurement sensor is in the state of the main target pressure or the auxiliary target pressure, and close the on-off valve in the supply line when the measurement value of the pressure measurement sensor is in the state of the main target pressure or the auxiliary target pressure, and calculate a variation in the measurement value of the pressure measurement sensor in a reference time in the state where the on-off valve in the supply line is closed, and determine that the inspection object has a gas leakage defect when the calculated variation in the measurement value is equal to or greater than a preset reference variation.
Further, the control portion may control the operation of the compressed air supply unit to supply the compressed air in the order of the respective pressures in the order of the designated order of the main target pressure and the auxiliary target pressure input by the pressure setting portion.
Further, the gas leakage defect inspection system may further include: and a repetition number setting unit that inputs a cycle repetition number of an inspection cycle for supplying compressed air in a predetermined order of the main target pressure and the auxiliary target pressure and inspecting whether or not a gas leakage defect exists in each supply state, wherein the control unit controls the operation of the compressed air supply unit and the on-off valve so that the inspection cycle is repeatedly executed by the cycle repetition number input by the repetition number setting unit.
The control unit may control the operation of the compressed air supply unit and the on-off valve according to the inspection cycle, and may control the operation of the on-off valve of the supply line connected to the inspection object to be closed when it is determined that any one of the plurality of inspection objects has a gas leakage defect during the progress of the inspection cycle, and to continue the inspection cycle for the remaining inspection objects while the on-off valve is closed.
Further, the compressed air supply unit may include: an air supply module that generates and supplies the compressed air in an intermediate pressure state lower than the primary target pressure or the auxiliary target pressure; a first regulator that is disposed downstream of the air supply module in such a manner as to pass compressed air supplied by the air supply module and that constantly adjusts the pressure of the compressed air to the intermediate pressure state; and a supercharging module that receives the compressed air passed through the first regulator, supercharges the state of the main target pressure or the assist target pressure, and supplies the same to the multi-manifold.
Further, the boosting module may include: an air supercharger that receives the compressed air in the intermediate pressure state having passed through the first regulator, and supercharges the pressure of the received compressed air to the main target pressure or the auxiliary target pressure; a second air tank that receives and stores compressed air pressurized by the air supercharger; and a second regulator that is disposed downstream of the second air tank in such a manner that the compressed air stored in the second air tank is supplied and passes through, and that constantly adjusts the pressure of the compressed air to a state of the main target pressure or the auxiliary target pressure.
ADVANTAGEOUS EFFECTS OF INVENTION
According to the present invention, since the compressed air is supplied only to the inspection object and is not recovered, the plurality of inspection objects can be connected in parallel by the multi-manifold, and thus, the plurality of inspection objects can be simultaneously inspected for the presence or absence of the gas leakage defect in one inspection operation.
Further, there is an effect that, by installing a temperature/humidity sensor capable of detecting the temperature and humidity of the compressed air supplied to the inspection object, it is possible to verify whether the amount of pressure change measured by the pressure measuring sensor is due to the influence of the temperature and humidity or due to a gas leakage defect in consideration of the measurement value of the temperature/humidity sensor, thereby making it possible to correct or verify the result of determination as to whether the inspection object has a gas leakage defect.
Further, the present invention has an effect that the present invention can be applied to inspection objects having various specifications by providing a pressurizing module capable of pressurizing the pressure of compressed air supplied to an inspection object and selectively supplying pressurized compressed air to the inspection object, and thus compressed air having different supply pressures can be supplied to the inspection object by one equipment.
Further, there is an effect that, in checking the gas leakage of the object to be checked, the checking work is not performed in one target pressure state, but the checking can be performed in a plurality of target pressure states in consideration of the usage environment of the object to be checked, so that the checking can be performed more accurately, and the order of the target pressures can be specified so that the compressed air in the plurality of target pressure states can be smoothly supplied, and the actual usage environment of the object to be checked can be more accurately copied, so that the accuracy of the gas leakage checking result can be improved.
Further, there is an effect that inspection accuracy can be further improved by repeating an inspection cycle of automatically performing inspection once with a plurality of target pressure states.
Further, even when it is determined that a gas leakage defect exists in one of the inspection objects, the inspection of the remaining inspection objects can be continued, and the inspection work can be performed more quickly on the plurality of inspection objects.
Drawings
Fig. 1 is a diagram schematically showing the overall structure of a gas leak defect inspection system of an embodiment of the present invention.
Fig. 2 is a functional block diagram functionally showing a control-related structure of the gas leak defect inspection system of an embodiment of the present invention.
Fig. 3 is a diagram exemplarily showing a pressure setting state by the pressure setting portion of the gas leakage defect inspection system of the embodiment of the present invention.
Fig. 4 is a view schematically showing the entire structure of the gas leakage defect inspection system including the compressed air supply unit according to an embodiment of the present invention.
Fig. 5 is a view schematically showing the entire structure of a gas leakage defect inspection system including a compressed air supply unit according to another embodiment of the present invention.
Fig. 6 and 7 are diagrams illustrating a flow state of compressed air of the gas leakage defect inspection system shown in fig. 5 in stages.
Detailed Description
Preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings. First, it should be noted that, when reference numerals are attached to the components of each drawing, the same components are given the same reference numerals as much as possible even when they are shown in different drawings. In describing the present invention, when it is judged that a detailed description of related well-known configurations or functions may obscure the gist of the present invention, a detailed description thereof is omitted.
Fig. 1 is a diagram schematically showing the overall configuration of a gas leak defect inspection system according to an embodiment of the present invention, fig. 2 is a functional block diagram functionally showing the control-related configuration of the gas leak defect inspection system according to an embodiment of the present invention, and fig. 3 is a diagram schematically showing the pressure setting state by the pressure setting portion of the gas leak defect inspection system according to an embodiment of the present invention.
A gas leakage defect inspection system according to an embodiment of the present invention is a system that connects an inspection object 10, such as a gas apparatus or a cooling apparatus, in which a gas flow path for supplying gas is formed and inspects whether or not the inspection object 10 has a gas leakage defect, and is an apparatus that can perform an inspection work of the inspection object 10 by supplying high-pressure compressed air and can perform the inspection work in a pressure state equal to an actual use pressure of the inspection object. Such a gas leakage defect inspection system may include a compressed air supply unit SP, a manifold 300, a plurality of supply lines 400 connected to the manifold 300, an on-off valve 500 attached to the supply lines 400, a pressure measurement sensor 600, a pressure setting unit 710 capable of setting and inputting a target pressure, and a control unit 700.
The compressed air supply unit SP is a device that generates and supplies compressed air, and is controlled by the control unit 700 so as to supply compressed air in the target pressure state set and input by the pressure setting unit 710. The compressed air supply unit SP constantly maintains the compressed air at a target pressure state and supplies it to the manifold 300.
The multi-manifold 300 is formed to flow in compressed air of a target pressure state supplied by the compressed air supply unit SP and discharge the flowed-in compressed air through the plurality of discharge ports 320. The multi-manifold 300 has one inflow port 310 through which the compressed air passing through the first regulator 200 flows, and a plurality of discharge ports 320 through which the compressed air is discharged.
The supply line 400 is formed such that one end is coupled to the discharge port 320 of the multi-manifold 300 and the other end is connected to the inspection object 10. A plurality of such supply lines 400 are provided, which are connected to the plurality of discharge ports 320 of the multi-manifold 300, respectively, and the inspection object 10 is connected to each of the supply lines 400, respectively.
An opening/closing valve 500 capable of opening and closing a flow path of the supply line 400 is installed in the supply line 400, and a pressure measurement sensor 600 capable of measuring the internal pressure of the supply line 400 is installed. The pressure measurement sensors 600 are connected to the supply line 400 at positions downstream of the position of the on-off valve 500. In addition, a temperature and humidity sensor 610 capable of measuring the temperature and humidity of the compressed air flowing in the internal flow path of the supply line 400 may be installed on the supply line 400.
The pressure setting portion 710 is formed to be operable by a user in such a manner as to be able to input a target pressure for the compressed air, and is formed to be able to input at least one of a main target pressure and an auxiliary target pressure for the compressed air, the auxiliary target pressure being a pressure different from the main target pressure. The main target pressure is a rated pressure suitable for the inspection target 10, and the auxiliary target pressure is various use pressures used in the actual environment of the inspection target 10, and such main target pressure and auxiliary target pressure can be variously set according to the needs of the user.
For example, when the rated gas pressure supplied to the inspection object 10 is 10bar as shown in fig. 3, the main target pressure may be set and input as 10bar, and when the actual usage pressure of such an inspection object 10 becomes 5bar, 6bar, 8bar, 12bar, or the like, the auxiliary target pressure may be set and input as 5bar, 6bar, 8bar, 12bar, or the like.
The control unit 700 controls the operations of the compressed air supply unit SP and the opening/closing valve 500 so that the compressed air in the main target pressure state and the compressed air in the auxiliary target pressure state are supplied to the inspection object 10, respectively, based on the input signal of the pressure setting unit 710. The control unit 700 applies the measured values of the plurality of pressure measurement sensors 600 for each supply state in a state where the compressed air is supplied to the inspection object 10 in the state of the main target pressure and the auxiliary target pressure, and determines whether or not the inspection object 10 connected to each supply line 400 has a gas leakage defect based on the amount of change over time of the applied measured values.
Describing the process of determining whether or not there is a gas leakage defect in the control unit 700 in more detail, the control unit 700 performs an opening operation of the opening/closing valve 500 until the measurement value of the pressure measurement sensor 600 becomes the set target pressure main target pressure or auxiliary target pressure, and performs a closing operation of the opening/closing valve 500 when the measurement value of the pressure measurement sensor 600 becomes the target pressure state. Then, the amount of change in the measurement value of the pressure measurement sensor 600 in the reference time is calculated in a state where the open/close valve 500 is closed, and when the calculated amount of change in the measurement value is equal to or greater than a preset reference amount of change, it is determined that the object 10 to be inspected has a gas leakage defect.
That is, the compressed air supplied from the compressed air supply unit SP is constantly maintained at the target pressure state and flows into the multi-manifold 300. The compressed air flowing into the multi-manifold 300 is supplied to the plurality of inspection objects 10 through the plurality of discharge ports 320 and the supply line 400, respectively. The valve 500 is opened in the process that the compressed air is supplied to the inspection object 10 through the supply line 400, and when the internal gas flow path of the inspection object 10 is all to be supplied and filled with the compressed air, the internal flow path of the supply line 400 is also all filled with the compressed air, thereby forming the target pressure state. When the pressure measurement sensor 600 measures such a target pressure state, the opening/closing valve 500 is closed, and the reference time is maintained in this state. In this way, in a state where the compressed air is filled in the inspection object 10 in a target pressure state, if the inspection object 10 has no gas leakage defect, the target pressure is maintained as it is, and if gas leakage occurs due to the presence of the gas leakage defect in the inspection object 10, the target pressure cannot be maintained as it is and pressure drop occurs. Since such a pressure change state is measured by all the pressure measurement sensors 600, if the pressure change amount measured by the pressure measurement sensors 600 is equal to or larger than the reference change amount, it is determined that the object 10 has a gas leakage defect.
In this case, since the pressure of the compressed air may naturally change depending on the temperature and humidity of the compressed air, the temperature/humidity sensor 610 capable of measuring the temperature and humidity of the compressed air may be installed in the supply line 400, and the control unit 700 may apply the measurement value of the temperature/humidity sensor 610 and determine whether the amount of pressure change measured by the pressure measurement sensor 600 is due to the influence of the temperature and humidity or due to the gas leakage defect in consideration of the applied measurement value of the temperature/humidity sensor 610, thereby correcting or verifying the determination result of whether the gas leakage defect exists in the inspection target 10.
In addition, in the gas leakage defect inspection system according to an embodiment of the present invention, the plurality of exhaust ports 320 are formed in the multi-manifold 300, the supply line 400 is connected to each exhaust port 320, and the inspection object 10 is connected to each supply line 400, respectively, so that it is possible to simultaneously determine whether or not a gas leakage defect exists for a plurality of inspection objects 10 at one inspection work. In particular, by configuring such that only the compressed air is supplied to the inspection object 10 without being recovered, the plurality of inspection objects 10 can be connected in parallel by the multi-manifold 300, and thus the plurality of inspection objects 10 can be inspected at the same time in one inspection operation.
On the other hand, in the setting process of the target pressure by the pressure setting section 710, when the rated gas pressure supplied to the inspection object 10 is 10bar as shown in fig. 3, the main target pressure may be set and input as 10bar, and the auxiliary target pressures may be set and input as 5bar, 6bar, 8bar, 12bar, and the like. At this time, the order of the main target pressure and the auxiliary target pressure may be specified, and the check may be performed in each target pressure state in such a specified order.
For example, when the rated gas pressure is 10bar, the setting and the sequence of the main target pressure and the auxiliary target pressure may be specified to be performed at 5bar, 6bar, 8bar, 10bar, 12bar, after which the inspection is finally performed again at 10 bar. The control unit 700 may control the operation of the compressed air supply unit SP to supply the compressed air in the pressure state in the order of the main target pressure and the auxiliary target pressure input from the pressure setting unit 710.
In addition, when an inspection cycle is set to one time in the process of supplying compressed air in the order of the main target pressure and the sub target pressure and inspecting whether or not there is a gas leak defect in each supply state, a repetition number setting unit 720 may be provided to input the number of repetitions of the cycle for such an inspection cycle, and the controller 700 may control the operation of the compressed air supply unit SP and the opening/closing valve 500 so that the inspection cycle is repeatedly executed by the number of repetitions input by the repetition number setting unit 720.
For example, as shown in fig. 3, it may be controlled to perform the inspection work by repeating the six steps of the inspection cycle of 5bar, 6bar, 8bar, 10bar, 12bar, 10bar three times.
At this time, it is preferable that the target pressure inputted and set is set to have a pressure value which sequentially increases, and unlike this, it may be set such that the increase and decrease of the target pressure value alternately occur, and when the target pressure value decreases, the compressed air of the pressure may be supplied in such a manner that the compressed air is discharged by the compressed air supply unit SP. At this time, it is possible to control the compressed air discharge process by the regulators 200, 830 of the compressed air supply unit SP, which will be described later.
The control unit 700 may control the operations of the compressed air supply unit SP and the on-off valve 500 according to the inspection cycle, and may control the operations to continue the inspection cycle for the remaining inspection objects 10 while closing the on-off valve 500 of the supply line 400 to which the inspection object 10 is connected, when it is determined that any one of the plurality of inspection objects 10 has a gas leakage defect during the progress of the inspection cycle.
With this configuration, the gas leak defect inspection system according to the embodiment of the present invention can perform the inspection in a plurality of target pressure states in consideration of the usage environment of the inspection target 10, instead of performing the inspection in one target pressure state when the inspection target 10 is inspected for a gas leak, thereby performing the inspection more accurately. Further, since the order of the target pressures can be specified, compressed air for a plurality of target pressure states can be supplied more smoothly, and the actual usage environment of the inspection object 10 can be more accurately copied, so that the accuracy of the gas leakage inspection result can be improved.
Meanwhile, a plurality of inspection objects 10 can be inspected at the same time, and even when it is determined that any one of the inspection objects 10 is defective, inspection can be continued for the remaining inspection objects 10, so that inspection work can be performed more quickly.
Next, a supply structure of the compressed air by the compressed air supply unit SP will be described in more detail.
Fig. 4 is a view schematically showing the entire structure of the gas leakage defect inspection system including the compressed air supply unit according to an embodiment of the present invention.
The compressed air supply unit SP according to an embodiment of the present invention may be constructed to include an air supply module 100 and a first regulator 200 as shown in fig. 4.
The air supply module 100 is a device for generating and supplying compressed air in a target pressure state, and may include: an air compressor 110 that compresses and supplies air; a first air tank 120 that receives and compresses air from the air compressor 110 and stores it and is combined with a connection line L at one side in such a manner as to supply the stored compressed air to the first regulator 200; an air filter 130 installed on the connection line L and filtering the compressed air; and an air dryer 140 installed on the connection line L and removing moisture of the compressed air. The air filter 130 may be disposed at positions upstream and downstream of the air dryer 140, respectively, and may be formed to filter foreign substances and moisture contained in the compressed air.
The compressed air generated by the air compressor 110 is stored in the first air tank 120 and the pressure and flow are maintained in a stable state, and is supplied to the first regulator 200 through the connection line L in the first air tank 120 in a state of stabilizing the pressure and flow. The connection line L is installed therein with the air filter 130 and the air dryer 140, and is supplied to the first conditioner 200 in a state in which moisture and foreign substances in the compressed air are removed.
The first regulator 200 is disposed downstream of the air supply module 100 in such a manner as to pass the compressed air supplied from the air supply module 100 and constantly adjusts the pressure of the compressed air to a target pressure state. Such a first regulator 200 may employ a general pressure regulator that performs a function of adjusting pressure so as to stably and constantly maintain fluid flowing in a finely varied state to a set pressure state with respect to a pressure value, and a detailed description thereof will be omitted herein.
The compressed air stably maintained in the target pressure state by the first regulator 200 flows into the multi-manifold 300 and is supplied to the plurality of inspection objects 10.
Fig. 5 is a diagram schematically showing an overall structure including a compressed air supply unit of a gas leakage defect inspection system according to another embodiment of the present invention, and fig. 6 and 7 are diagrams showing a flow state of compressed air of the gas leakage defect inspection system shown in fig. 5 in stages.
The compressed air supply unit SP according to still another embodiment of the present invention may be configured to include an air supply module 100, a first regulator 200, and a pressurizing module 800 as shown in fig. 5.
The air supply module 100 and the first regulator 200 may be applied the same as described in fig. 4, it being noted that compressed air is generated and supplied in the air supply module 100 in an intermediate pressure state lower than the target pressure input to the pressure setting part 710, and the first regulator 200 constantly and stably maintains such compressed air in the intermediate pressure state to be supplied to the pressure increasing module 800.
The boost module 800 is a member that receives compressed air in the intermediate pressure state that has passed through the first regulator 200, boosts the pressure to a target pressure state, and supplies the boosted pressure state, and may include: an air supercharger 810 that receives compressed air in an intermediate pressure state passing through the first regulator 200 and supercharges the pressure of the received compressed air to be higher than a target pressure; a second air tank 820 that receives and stores compressed air pressurized by the air supercharger 810; and a second regulator 830 disposed downstream of the second air tank 820 in such a manner that the compressed air stored in the second air tank 820 is supplied and passes therethrough and constantly adjusting the pressure of the compressed air to a target pressure state.
With this configuration, the compressed air having passed through the intermediate pressure state of the first regulator 200 can be pressurized to the target pressure state by sequentially passing through the air supercharger 810, the second air tank 820, and the second regulator 830. The compressed air pressurized by the air supercharger 810 is temporarily stored in the second air tank 820 and adjusted to the target pressure state by the second regulator 830 in a stabilized state, and thus the pressure state of the compressed air can be more stably maintained to the target pressure state.
The compressed air thus pressurized to the target pressure by the pressurization module 800 flows into the multi-manifold 300 and is supplied to the plurality of inspection objects 10.
In this case, a single intermediate manifold 350 may be provided on the upstream side of the multi-manifold 300, and the intermediate manifold 350 may be formed with two inflow ports 351 and one discharge port 352, and may be configured such that the compressed air in the intermediate pressure state that has passed through the first regulator 200 and the compressed air in the target pressure state that has passed through the booster module 800 flow into the intermediate manifold 350 through the two inflow ports 351, respectively, are discharged through the one discharge port 352, and flow into the multi-manifold 300. By providing the intermediate manifold 350 in this manner, only one inflow port 310 can be formed in the multi-manifold 300.
The control unit 700 controls the operation of the on-off valve 500 on the connecting line L such that the compressed air in the intermediate pressure state passing through the first regulator 200 and the compressed air in the target pressure state passing through the booster module 800 are sequentially supplied to the manifold 300, the measurement value of the pressure measurement sensor 600 is applied thereto, and it is determined whether or not the object to be inspected 10 connected to the supply line 400 has a gas leakage defect based on the amount of change with time of the applied measurement value.
To be described in more detail, the connection line L connected to the outlet end of the first regulator 200 is branched into two in the middle section, one of the two branches extends toward the manifold 300, the other one extends toward the pressurizing module 800, and the two branch lines are respectively provided with the opening and closing valve 500. Two branch lines are respectively connected to the inflow ports 351 of the intermediate manifold 350 so that the compressed air flows into the multi-manifold 300 through the intermediate manifold 350. Further, a three-port fitting part 910 is installed on a connection line L connected to the outlet end of the first regulator 200, the three-port fitting part 910 is formed with three separate ports on the upstream side of the position where the connection line L branches into two branch lines, the connection line L is coupled to the two ports of the three-port fitting part 910, respectively, and a separate pressure measuring sensor 600 is installed on one port, so that it is possible to detect whether the pressure of the compressed air passing through the first regulator 200 is in an intermediate pressure state.
The control part 700 may sequentially supply the compressed air of the intermediate pressure state and the compressed air of the target pressure state to the manifold 300 by sequentially opening the opening and closing valves 500 respectively installed at the two branch lines.
That is, first, when the opening and closing valve 500 attached to the branch line connected to the first regulator 200 is opened and the opening and closing valve 500 attached to the branch line connected to the pressurizing module 800 is closed, as shown in fig. 6, the compressed air in the intermediate pressure state passing through the first regulator 200 flows into the multi-manifold 300 through the intermediate manifold 350 and is supplied to the inspection target object 10 along the supply line 400. At this time, the on-off valve 500 attached to the supply line 400 is continuously maintained in the open state. Thereafter, when the opening and closing valve 500 installed on the branch line connected to the first regulator 200 is closed and the opening and closing valve 500 installed on the branch line connected to the pressurizing module 800 is opened, as shown in fig. 7, the compressed air in the target pressure state passing through the pressurizing module 800 flows into the multi-manifold 300 through the intermediate manifold 350 and is supplied to the inspection object 10 along the supply line 400.
Based on such an operation procedure, compressed air in an intermediate pressure state, which is a relatively low pressure, is supplied to the inspection object 10, and then compressed air in a target pressure state, which is a relatively high pressure (final supply pressure), is sequentially supplied.
That is, the compressed air supplied from the air supply module 100 is stabilized to an intermediate pressure state by the first regulator 200 and is supplied to the inspection object 10 once, and thereafter, is pressurized to a target pressure state by the first regulator 200 and the pressurization module 800 and is supplied to the inspection object 10 twice.
At this time, the control section 700 opens the on-off valve 500 on the supply line 400 until the measurement value of the pressure measurement sensor 600 attached to the supply line 400 becomes the target pressure state, and closes the on-off valve 500 when the measurement value of the pressure measurement sensor 600 becomes the target pressure state. Then, the amount of change in the measurement value of the pressure measurement sensor 600 in the reference time is calculated in a state where the open/close valve 500 is closed, and it is determined that the object 10 has a gas leakage defect when the calculated amount of change in the measurement value is equal to or greater than a preset reference amount of change.
With this configuration, in the gas leakage defect inspection system according to the embodiment of the present invention, the compressed air in the low pressure state and the compressed air in the high pressure state are sequentially supplied to the compressed air in two steps, so that damage due to pressure impact on the inspection target 10 in the process of supplying the high pressure compressed air to the inspection target 10 can be prevented.
That is, when the pressure of the compressed air required for the inspection of the inspection object 10 is the high target pressure, if the compressed air in the target pressure state (high pressure state) is supplied to the inspection object 10 from the beginning in the process of supplying the compressed air to the inspection object 10, the inspection object 10 may be damaged by the impact of the high pressure compressed air, however, in one embodiment of the present invention, as described above, the compressed air in the intermediate pressure state, which is the relatively low pressure, is supplied to the inspection object 10 for the first predetermined time, and then the compressed air in the target pressure state, which is the relatively high pressure, is sequentially supplied to the inspection object 10, so that the damage by the pressure impact of the inspection object 10 can be prevented.
In this case, the air compressor 110 of the air supply module 100 may have a capacity capable of compressing and supplying air in an intermediate pressure state lower than the target pressure, and even if the intermediate pressure capacity in a relatively low pressure state is used for the air compressor 110 in this way, the compressed air may be supplied by pressurizing the compressed air to the target pressure state in a relatively high pressure state by the pressurizing module 800, and particularly, by using the intermediate pressure capacity in a relatively low pressure state for the air compressor 110, the size of the air compressor 110 may be reduced, and the entire system may be reduced in size and easily transported, so that the inspection target 10 may be inspected on site in actual site.
The above is merely an exemplary description of the technical idea of the present invention, and those skilled in the art to which the present invention pertains will be able to make various modifications and variations within the scope not departing from the essential characteristics of the present invention. Therefore, the embodiments disclosed in the present invention are not intended to limit the technical ideas of the present invention, but to illustrate the technical ideas of the present invention, and the scope of the technical ideas of the present invention is not limited to these embodiments. The scope of the present invention should be construed by the claims which follow, and any technical ideas within the scope of equivalents thereof should be construed to fall within the scope of the claims.
Claims (9)
Applications Claiming Priority (5)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR1020190082704A KR102271831B1 (en) | 2019-07-09 | 2019-07-09 | Gas leak test system for high pressure |
| KR10-2019-0082704 | 2019-07-09 | ||
| KR1020190163801A KR102147162B1 (en) | 2019-12-10 | 2019-12-10 | Multi step gas leak test system for high pressure |
| KR10-2019-0163801 | 2019-12-10 | ||
| PCT/KR2020/002631 WO2021006452A1 (en) | 2019-07-09 | 2020-02-24 | Multi-inspection and multi-step gas leak defect inspection system |
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| CN114041047A true CN114041047A (en) | 2022-02-11 |
| CN114041047B CN114041047B (en) | 2024-11-08 |
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| WO (1) | WO2021006452A1 (en) |
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|---|---|
| WO2021006452A1 (en) | 2021-01-14 |
| CN114041047B (en) | 2024-11-08 |
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