KR20160116902A - Coolant leak inspection method - Google Patents

Coolant leak inspection method Download PDF

Info

Publication number
KR20160116902A
KR20160116902A KR1020150045303A KR20150045303A KR20160116902A KR 20160116902 A KR20160116902 A KR 20160116902A KR 1020150045303 A KR1020150045303 A KR 1020150045303A KR 20150045303 A KR20150045303 A KR 20150045303A KR 20160116902 A KR20160116902 A KR 20160116902A
Authority
KR
South Korea
Prior art keywords
leakage
air
cooling water
compressed air
temperature
Prior art date
Application number
KR1020150045303A
Other languages
Korean (ko)
Inventor
오창복
유병주
박종수
Original Assignee
태원물산주식회사
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 태원물산주식회사 filed Critical 태원물산주식회사
Priority to KR1020150045303A priority Critical patent/KR20160116902A/en
Priority to PCT/KR2015/003222 priority patent/WO2016159410A1/en
Publication of KR20160116902A publication Critical patent/KR20160116902A/en

Links

Images

Classifications

    • 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
    • G01M3/32—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 containers, e.g. radiators
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
    • F28F11/00—Arrangements for sealing leaky tubes and conduits
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
    • G01K13/00—Thermometers specially adapted for specific purposes
    • 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
    • G01M3/04—Investigating fluid-tightness of structures by using fluid or vacuum by detecting the presence of fluid at the leakage point
    • 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
    • G01M3/32—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 containers, e.g. radiators
    • G01M3/3236—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 containers, e.g. radiators by monitoring the interior space of the containers
    • G01M3/3263—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 containers, e.g. radiators by monitoring the interior space of the containers using a differential pressure detector

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Thermal Sciences (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Examining Or Testing Airtightness (AREA)

Abstract

The present invention relates to a coolant leak inspection method. The coolant leak inspection method comprises: a step of injecting compressed air to an inspection area of an object to determine whether air leaks in the object through a change in the pressure and temperature values of the compressed air; a step of measuring the amount of gas leaking in the object if it is determined that the air leaks in the object; and a step of changing the measured leaking amount of the gas into the leaking amount of a coolant.

Description

COOLANT LEAK INSPECTION METHOD

The present invention relates to a cooling water leakage inspection method, and more particularly, to a cooling water leakage inspection method for inspecting a leakage amount of cooling water based on an air leakage amount of an object to be inspected.

BACKGROUND ART [0002] Conventionally, when a product or a part requiring leakage prevention is produced, it is determined whether or not the product is leaking on the production process line to determine whether or not the product is defective.

Particularly, sealing in a component using a working fluid is a very important factor in terms of prevention of aging of component parts and failure prevention. For example, when leakage occurs in a finished vehicle to which an automotive component using a working fluid is applied, There arises a problem that the operation itself becomes impossible. Therefore, when a liquid such as water is used for a part of the automobile parts where a working fluid is used, a leakage test is carried out on the production line. In the case of using a liquid such as water, , The leakage test is normally conducted using air. Particularly, as standards for the air leakage allowance have recently been strengthened, for example, in the case of a water pump, the standard that was less than 8 cc / min under the air pressure of 1.5 bar was strengthened to 1 cc / min or less under the same air pressure condition There is a trend.

On the other hand, the air leakage test for automobile parts uses a flow rate type or a differential pressure type. Since the seal area is wide and the leakable area is many, it is difficult to install the flow meter. do.

The differential pressure type leakage test currently used for automobile parts is generally performed by pressing the final product on the leakage test jig and then pressing the test piece to the inspection area formed between the final product and the jig through the compressed air injection part at a pressure of typically 1.5 bar Is injected. The pressure difference from the initial pressure is checked after a certain time has elapsed through the leakage detecting part while the compressed air in the inspection area is maintained at a predetermined pressure at the start of the inspection and the control part of the air leakage tester Calculate the amount of air leakage through the formula.

The converted air leakage amount value is compared with a reference value, and if the reference value is greater than or equal to the reference value, it is determined that the air leakage amount is defective. Meanwhile, in the case of air used in the conventional pressure-type air leakage test, the compressed air is introduced into the inspection region inside the sealed jig by using a compressor. Compressed air is higher than the initial temperature in the compression process, The temperature of the compressed air inside the jig changes according to the external environment such as seasonal factors, and in this case, serious problems occur in detection accuracy and detection reliability. Further, in some cases, a defective product flows out, which causes a rise in quality cost, or a defective product is mistaken as a defective product, thereby raising a loss cost.

Furthermore, in the conventional differential pressure type leakage test, since it is determined only by the air leakage amount, it is insufficient to judge the amount of leakage of the cooling water actually.

The background art of the present invention is disclosed in Korean Patent Laid-Open Publication No. 2012-0013526 (2012.02.15, leak inspection apparatus and method).

An object of the present invention is to provide a cooling water leakage inspection method for inspecting a leakage amount of cooling water on the basis of an air leakage amount of an object to be inspected.

It is another object of the present invention to provide a cooling water leakage inspection method capable of improving the reliability of a leakage inspection result and determining whether an accurate leakage of the inspection object is made.

According to an aspect of the present invention, there is provided a method of inspecting a cooling water leakage, comprising the steps of: injecting compressed air into an inspection area of an object to be inspected to determine whether air leaks from the inspected object due to changes in the pressure value and the temperature value of the compressed air; Measuring an amount of leakage of gas leaking from the object to be inspected if it is determined that air is leaking from the object to be inspected; And converting the measured gas leakage amount into a cooling water leakage amount.

In the present invention, the step of determining whether or not air is leaked from the test object includes: storing the compressed air so that the air pressure inside the air cylinder has a first pressure value; Adjusting the temperature of the compressed air stored in the air cylinder to satisfy a first temperature value; Injecting the compressed air stored in the air cylinder into a test region formed between the jig and the test subject; And detecting a change in a pressure value and a temperature value of the compressed air in the inspection area to determine whether the inspection object has leaked.

According to an embodiment of the present invention, the step of determining leakage of the test object may include measuring a pressure value and a temperature value of compressed air in the inspection area; Measuring pressure and temperature changes of the compressed air inside the inspection area; Calculating an air leakage amount of the subject using the pressure and temperature change values of the compressed air inside the inspection region; And determining that leakage has occurred in the test subject if the calculated air leakage amount is equal to or larger than a set value.

The method according to claim 1, further comprising the step of determining whether or not leakage of the cooling water is determined based on the leakage amount of the cooling water.

According to an embodiment of the present invention, the final determination of the leakage of the cooling water based on the leakage amount of the cooling water may include a step of determining whether leakage of the cooling water occurs when the total cooling amount of the cooling water is within a predetermined set time, And a determination is made.

According to the present invention, it is possible to estimate the leakage area and leakage amount of the cooling water based on the air leakage amount of the subject.

Further, the present invention minimizes the inspection area and minimizes the temperature change of the compressed air during the inspection time, thereby reducing the air leakage deviation and improving the detection reliability and detection accuracy. In addition, it has an effect of minimizing the quality cost and reducing the cost by decreasing the error that determines the outflow of the defective part and the defective product.

1 is a block diagram illustrating a cooling water leakage auditing apparatus according to an embodiment of the present invention.
2 is a block diagram showing a cooling water leakage test apparatus according to another embodiment of the present invention.
3 is a flowchart illustrating a method of inspecting a cooling water leakage according to an embodiment of the present invention.

Hereinafter, a cooling water leakage inspection method according to an embodiment of the present invention will be described in detail with reference to the accompanying drawings. In this process, the thicknesses of the lines and the sizes of the components shown in the drawings may be exaggerated for clarity and convenience of explanation. Further, the terms described below are defined in consideration of the functions of the present invention, which may vary depending on the user, the intention or custom of the operator. Therefore, definitions of these terms should be made based on the contents throughout this specification.

1 is a block diagram showing a cooling water leakage testing apparatus according to an embodiment of the present invention.

First, a derivation process of the conversion formula used in the cooling water leakage inspection method according to an embodiment of the present invention will be described. In this embodiment, the compressed air to be used is set as an ideal gas in the inspection region, and thus the compressed air in the inspection region satisfies the following ideal gas state equation (Equation 1).

Figure pat00001

Where P is the pressure of the gas, V is the volume of the gas, m is the mass of the gas, R is the gas constant, and T is the absolute temperature. Therefore, the mass m of the gas can be expressed by the following equation (2).

Figure pat00002

Here, when the both sides are differentiated with respect to time, the volume in the inspection area is constant with respect to the change of time, and can be expressed as the following equation (3).

Figure pat00003

When integrating both sides of the equation (3) with respect to time, the volume in the inspection region is V 1 , the temperature in the inspection initial jig is T 1 , the pressure in the inspection initial jig is P 1 , the temperature in the jig T 2 , the pressure in the jig is P 2 , the amount of change in pressure at time t is ΔP, and the amount of change in temperature is ΔT.

Figure pat00004

Therefore, the leakage amount per unit time is expressed by the following equations (5) and (6).

Figure pat00005

Figure pat00006

Where T 1 is the temperature of the compressed air in the inspection region at the start of the test, T 2 is the temperature of the compressed air in the inspection region at the end of the test, P 1 is the temperature P 2 is the pressure of the compressed air in the inspection area at the end of the inspection, and t is the inspection time.

Table 1 below shows the calculation results in the conversion equation considering the change in the temperature of the compressed air when the allowable air leakage amount is 1 cc / min using the above equation. As shown in Table 1, when the allowable air leakage amount is less than 1 cc / min, the indicated air leakage amount when the test compressed air has risen 5 ° C compared to the case where the temperature of the compressed test air is equal to the jig temperature (Case 3) (Case 4), and when the temperature drops by 5 ° C, the indicated air leakage increases by about 1 cc / min (Case 5).

Figure pat00007

Therefore, in order to improve the detection accuracy, it is necessary to keep the temperature of the inspection region in the jig constant during the detection time. Hereinafter, a cooling water leakage inspection apparatus according to the present embodiment, which can maintain the temperature of the inspection region in the jig constant during the detection time, will be described below.

Referring to FIG. 1, a cooling water leakage testing apparatus according to an embodiment of the present invention includes a compressor 11, a compressed air injection unit 10 including a regulator 12, an air cylinder 31, a first temperature sensor 33 A pressure sensor 41 for measuring the pressure inside the jig 21 and a pressure sensor 41 for measuring the pressure inside the jig 21. The pressure sensor 41 measures the pressure inside the jig 21, A control unit 42, a conversion unit 50, and a gas leakage amount measurement unit 60.

The compressed air injection unit includes a compressor (11) and a regulator (12). The compressor 11 applies pressure to the gas to generate compressed air, and the regulator 12 adjusts the compressed air to the air pressure necessary for the leak test and transfers it to the air cylinder 31. [

In the case of a large compressor used in an operation line, it is preferable to use a separate small compressor when the temperature of the compressed air is likely to change due to excessive air compression.

The compressed air that has passed through the regulator 12 is injected into the air cylinder 31 and the injection of the compressed air proceeds until the pressure inside the air cylinder 31 reaches the air pressure required for the leak test. The air cylinder 31 temporarily stores compressed air therein, and has a temperature controller to control the temperature of the stored compressed air to satisfy a predetermined temperature range.

On the other hand, on the outer surface of the air cylinder 31 shown in Fig. 1, at least one cooling fin 32 is formed. The cooling pin 32 increases the efficiency of thermal conduction between the air cylinder 31 and the outside air to increase the temperature of the compressed air inside the air cylinder 31 by a natural convection within a predetermined range, And so on. Therefore, in the cooling water leakage test apparatus according to the embodiment of the present invention, the compressed air stored in the air cylinder 31 is left for a predetermined time, so that the temperature of the compressed air can be adjusted to have a value substantially equal to the outside air temperature There is no need for a complicated thermostat to control the temperature of the compressed air. Therefore, the manufacturing cost and the management cost of the inspection apparatus can be reduced.

On the other hand, the air cylinder 31 has a first pressure sensor 35 for measuring the pressure inside the air cylinder 31 and a first temperature sensor 33 for measuring the temperature inside the air cylinder 31, Respectively. The cooling water leakage testing apparatus according to an embodiment of the present invention includes a second temperature sensor 51 capable of measuring the ambient temperature, 51) so that it is possible to judge whether or not the temperature inside the air cylinder 31 is within a predetermined range of the outside air temperature, for example, within the range of 占 0.1 占 of the outside air temperature.

The apparatus for inspecting leakage of cooling water according to an embodiment of the present invention includes a jig 21 for fixing a test object 22 to be inspected and forming an inspection area 23 therein. The inspection region 23 means a closed space formed between the jig 21 and the subject 22 when the subject 22 is fixed to the jig 21. The compressed air from the air cylinder 31 It is the space to be injected. The jig 21 may have a separate sealing device (not shown) or a clamping device (not shown) for fixing the test object 22 to the jig 21. [ The jig 21 includes a second pressure sensor 41 for measuring the pressure of the inspection area 23 inside the jig 21 and a third temperature sensor 24 for measuring the temperature of the inspection area 23, .

The third temperature sensor 24 may be composed of a plurality of temperature sensors. Preferably, the plurality of temperature sensors may be arranged diagonally on the wall portion of the jig 21 in a direction facing each other. In this case, it is possible to determine whether or not the temperature distribution in the inspection region 23 inside the jig 21 is constant by comparing the measured values of the plurality of temperature sensors.

The pipeline connecting between the jig 21 of the cooling water leakage test apparatus and the air cylinder 31 according to the embodiment of the present invention is regulated by the valve 34 to open and close. The valve 34 is kept closed until the temperature inside the air cylinder 31 satisfies a predetermined range. However, if the temperature inside the air cylinder 31 is within a predetermined range, for example, within the range of 0.1 C of the outside air temperature So that compressed air can be delivered from the air cylinder 31 into the inspection area 23 of the jig 21. [ On the other hand, when the pressure inside the inspection area 23 of the jig 21 reaches the pressure required for the leakage inspection, the valve 34 is closed so that the compressed air is not transferred from the air cylinder 31 into the inspection area 21 do.

On the other hand, in the case of a pipeline connecting between the jig 21 and the air cylinder 31, if the length of the pipeline is long, there is a possibility that the temperature change may be increased due to the influence of the outside air in the process of injecting the compressed air. You need to minimize it. The inspection area 23 inside the jig 21 also includes a pipeline connecting between the valve 34 and the jig 21. In order to reduce the loss of compressed air, It is preferable that the valve is arranged as close as possible to the jig 21.

In the cooling water leakage inspection apparatus according to the embodiment of the present invention, the change in pressure and temperature in the inspection area 23 inside the jig 21 is measured during the inspection time t, . Specifically, the jig (21) inside the initial temperature (T1) and the initial pressure (P 1) for measurement, and the jig 21, the temperature of the inside after the predetermined test time (t) elapsed at the time of air leakage test start ( T 2 ) and the pressure (P 2 ) are measured, and the air leakage amount is calculated by the control unit 42 through the above-described conversion formula (6) using the measured values.

The gas leakage amount measuring unit 60 measures a gas leakage amount leaked from the test subject by collecting a gas leaked from the leaked portion of the test subject, for example, helium. Here, the time for collecting the gas may be various times for checking the leakage portion and confirming the leakage amount. For example, when measuring the leakage amount of helium from the leakage portion through the gas leakage amount measuring portion 60, the gas leakage amount measuring portion 60 collects helium through the helium tube at the leakage portion where helium leakage occurs, The amount of helium can be measured. For reference, the gas leak amount measuring part 60 may employ various devices for collecting the gas leaked from the test object.

The converting unit 50 converts the gas leakage amount measured by the gas leakage amount measuring unit 60 into the cooling water leakage amount.

The leakage amount of the cooling water can be calculated by the following equation (7).

Figure pat00008

Here, Q l is the cooling water leakage, Q a is the amount of gas leakage trapped by the gas leak rate measurement unit (60), η a is the gas viscosity, η l is the water viscosity, (P i) l is the cooling water test pressure (P i ) a is the gas test pressure.

2 is a block diagram showing a cooling water leakage test apparatus according to another embodiment of the present invention.

2, the cooling water leakage test apparatus according to another embodiment of the present invention is the same as the configuration of the cooling water leakage leakage apparatus shown in Fig. 2, except for the configuration of the air cylinder 31. Fig.

Unlike the air cylinder 31 shown in the first embodiment, the air cylinder 31 of the cooling water leakage test apparatus according to the second embodiment of the present invention does not have the cooling fin 32 on its outer surface, And a device 36. The thermoelectric element 36 generates a voltage at both ends of the conductor when a temperature difference is caused by applying heat to one of the junctions in a closed circuit connected with two different kinds of metals. When a DC current is applied to both ends of the conductor, / The principle of thermoelectric development that generates heat by generating heat is used. The thermoelectric element 36 can be operated by applying a predetermined power according to an external control switch. At this time, the thermoelectric element 36 is provided with a heat radiating plate 37 having a sufficient size. Further, the thermoelectric element 36 is provided with a drive fan 38 which is positioned and fixed toward the heat sink 37.

According to the above configuration, when the temperature inside the air cylinder 31 rises above a predetermined temperature, the cooling function of the thermoelectric element 36 is used to correspond to the inside of the air cylinder 31 The temperature can be adjusted to an appropriate level. This enables precise temperature control within a short time.

That is, the function of the thermoelectric element 36 is utilized, and the driving fan 38 is operated to bring the air flow inside the air cylinder 31 into contact with the heat radiating plate 37, The temperature can be adjusted to a temperature range suitable for differential pressure air leak testing.

Hereinafter, a cooling water leakage inspection method according to an embodiment of the present invention will be described in detail with reference to FIG.

3 is a flowchart illustrating a method of inspecting a cooling water leakage according to an embodiment of the present invention.

Referring to FIG. 3, first, air is compressed using the compressor 11 (S10). At this time, the temperature of the air is increased from the initial temperature in the process of compressing the air using the compressor (11).

Next, using the regulator 12, the pressure of the air compressed by the compressor 11 is adjusted to the pressure necessary for the air leakage test (S20).

Then, the compressed air having passed through the regulator 12 is injected into the air cylinder 31 (S30). Then, the inside of the air cylinder 31 is filled with compressed air that has passed through the regulator 12. Accordingly, the pressure inside the air cylinder 31 is increased by the injection of the compressed air, so that the pressure inside the air cylinder 31 is measured through the pressure sensor 35, That is, the pressure value required for the air leakage test is satisfied (S40). As a result of the determination, when it is determined that the pressure inside the air cylinder 31 does not satisfy the predetermined pressure value, the injection of the compressed air into the air cylinder 31 is continued (S30) The air pressure is measured again, and the process of determining whether or not the predetermined pressure value is satisfied is performed again (S40).

When it is determined that the pressure inside the air cylinder 31 satisfies the predetermined pressure value, here, the pressure value required for the air leakage test, the injection of the compressed air into the air cylinder 31 is stopped, The internal temperature is measured by the first temperature sensor 33 and it is determined whether or not the temperature inside the air cylinder 31 satisfies a predetermined temperature value range, for example, a range of +/- 0.1 DEG C of the outside air temperature value (S50) do.

If it is determined that the temperature inside the air cylinder 31 does not satisfy the predetermined temperature range, the compressed air temperature control unit adjusts the temperature of the compressed air inside the air cylinder 31 (S60) do.

The step S60 of adjusting the temperature of the compressed air in the air cylinder 31 is performed in such a manner that the compressed air inside the air cylinder 31 is changed from the temperature of the outside air The temperature of the compressed air inside the air cylinder 31 can be adjusted to be within a predetermined range. In this case, the temperature of the compressed air can be easily adjusted without using a complicated thermostat. On the other hand, a plurality of cooling fins 32 are formed on the outer surface of the air cylinder 31 of the differential pressure type air leakage apparatus according to the present invention shown in FIG. 1, So that heat transfer can be easily performed.

The step S60 of adjusting the temperature of the compressed air inside the air cylinder 31 may be carried out in accordance with the embodiment of the present invention shown in FIG. 2 by changing the function of the thermoelectric element 36 provided inside the air cylinder 31 And adjusting the temperature of the compressed air in the air cylinder 31 by using the air. According to a preferred embodiment of the present invention, the thermoelectric element 36 is provided with a heat dissipating plate 37 on one side thereof and further includes a drive fan 38 which can be driven toward the heat dissipating plate 37, The compressed air in the heat exchanger 31 can be directly connected to the heat sink 37, so that the cooling efficiency can be further increased.

In the case of using the thermoelectric element 36 as in the embodiment of the present invention, in contrast to the case where the temperature inside the air cylinder 31 is kept to be within the predetermined temperature range, accurate temperature control can be performed in a short time .

When it is determined that the temperature inside the air cylinder 31 satisfies the predetermined temperature range, the valve 34 is opened to supply the compressed air stored in the air cylinder 31 to the jig 21, The compressed air is injected into the inspection area 23 formed between the discharge port 22 and the inspection area 23 (S70).

When the compressed air is injected into the inspection region 23, the pressure inside the inspection region 23 is measured through the pressure sensor 41 so that the pressure inside the inspection region 23 is lower than the pressure required for the leakage inspection, It is determined whether or not the first pressure value has been reached (S80). If it is determined that the pressure inside the inspection area 23 has not reached the pressure value required for the leak inspection, the injection of compressed air (S70) into the inspection area 23 is continued.

When the pressure inside the inspection region 23 is determined to have reached the pressure value necessary for the leakage inspection, the leakage inspection is started and the temperature change and the pressure change inside the inspection region 23 for the predetermined time t are transmitted to the jig 21 (S90) by using the third temperature sensor 24 and the pressure sensor 41 provided in the main body (not shown).

Next, the temperature value (T 1 ) and the pressure value (P 1 ) at the start of the leak test and the temperature value (T 2 ) and the pressure value (P 2 ) And the control unit 42 calculates the gas leakage amount of the subject 22 (S100).

The control unit 42 determines whether the air leakage amount calculated as a result of the conversion formula is equal to or greater than the set value (S110). If the determination result is larger than the set value, the control unit 42 determines whether the air- It is determined that leakage occurs (S120).

Next, the control unit 42 controls the gas leakage amount measuring unit 60 to measure the amount of gas leakage from the leaked portion of the test subject (S130).

When the gas leakage amount is measured by controlling the gas leakage amount measurement unit 60, the control unit 42 converts the gas leakage amount into the cooling water conversion amount using the above-described Equation (7) (S140).

The control unit 42 determines whether the time for which the leaked total amount of cooling water is generated by the preset amount is within the set time (S150). Here, the set amount and the set time are set in advance as a grounded value that can determine that the coolant leakage is serious when the set amount is leaked for the set time. For example, the set amount may be set to 1cc, and the set time may be set to 30 minutes.

For reference, the Dynamic viscosity of 25 ℃ gas is 1.85X10 -5 Ns / m 2, the Dynamic viscosity at a temperature of 90 ℃ to the actual cooling operation is about 10cP (= 0.01Ns / m 2) , Water pump revolutions 6000RPM And 3.5 bar is generated inside the water pump, the cooling water conversion amount becomes 0.046 cc / min by substituting in Equation (7).

In this case, assuming that the cooling water is generated intensively at a specific leakage portion of the test subject, it can be judged that 1cc is generated when the operation is performed under the same condition for about 21.7 minutes.

In other words, when the control unit 42 is leaked as a cooling water conversion amount, it is determined that there is a cooling water leakage when the time for which the total cooling water leaked is within the set time by the predetermined set amount (S160).

As described above, in the present embodiment, it is possible to estimate the leaked portion of the subject and the leakage amount of the cooling water based on the air leakage amount of the subject.

In addition, the present embodiment minimizes the inspection area and minimizes the temperature change of the compressed air during the inspection time, thereby reducing the air leakage deviation and improving the detection reliability and detection accuracy. In addition, it has an effect of minimizing the quality cost and reducing the cost by decreasing the error that determines the outflow of the defective part and the defective product.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is clearly understood that the same is by way of illustration and example only and is not to be taken by way of limitation, I will understand. Accordingly, the true scope of the present invention should be determined by the following claims.

10: Compressed air injection unit
11: Compressor
12: Regulator
21: Jig
22: Subject
23: inspection area
24: third temperature sensor
30: Leak detection unit
31: Air bomb
32: cooling pin
33: first temperature sensor
34: Valve
35: first pressure sensor
36: thermoelectric element
37: heat sink
38: Powered fan
41: second pressure sensor
42:
51: second temperature sensor

Claims (5)

Injecting compressed air into an inspection area of an object to be inspected to determine whether air is leaked from the inspected object by a change in a pressure value and a temperature value of the compressed air;
Measuring an amount of leakage of gas leaking from the object to be inspected if it is determined that air is leaking from the object to be inspected; And
And converting the measured gas leakage amount into a cooling water leakage amount.
The method of claim 1, wherein the step of determining whether air is leaked from the test object
Storing the compressed air such that the air pressure inside the air cylinder has a first pressure value;
Adjusting the temperature of the compressed air stored in the air cylinder to satisfy a first temperature value;
Injecting the compressed air stored in the air cylinder into a test region formed between the jig and the test subject;
And detecting a change in the pressure value and the temperature value of the compressed air in the inspection area to determine whether the inspection object has leaked.
3. The method of claim 2,
Measuring a pressure value and a temperature value of compressed air in the inspection area;
Measuring pressure and temperature changes of the compressed air inside the inspection area;
Calculating an air leakage amount of the subject using the pressure and temperature change values of the compressed air inside the inspection region; And
And judging that leakage has occurred in the test subject if the calculated air leakage amount is not less than a set value.
The method according to claim 1, further comprising the step of finally determining whether or not leakage of cooling water occurs based on the amount of leakage of the cooling water.
The method according to claim 4, wherein the final cooling water leakage is determined based on the cooling water leakage amount,
Wherein the cooling water leakage determination means determines that the cooling water leakage occurs when the time when the total cooling water amount of the cooling water generated by the leakage amount of the cooling water is equal to or less than a predetermined set time.
KR1020150045303A 2015-03-31 2015-03-31 Coolant leak inspection method KR20160116902A (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
KR1020150045303A KR20160116902A (en) 2015-03-31 2015-03-31 Coolant leak inspection method
PCT/KR2015/003222 WO2016159410A1 (en) 2015-03-31 2015-03-31 Method for inspecting for coolant leakage

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
KR1020150045303A KR20160116902A (en) 2015-03-31 2015-03-31 Coolant leak inspection method

Publications (1)

Publication Number Publication Date
KR20160116902A true KR20160116902A (en) 2016-10-10

Family

ID=57005239

Family Applications (1)

Application Number Title Priority Date Filing Date
KR1020150045303A KR20160116902A (en) 2015-03-31 2015-03-31 Coolant leak inspection method

Country Status (2)

Country Link
KR (1) KR20160116902A (en)
WO (1) WO2016159410A1 (en)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113790861B (en) * 2021-08-02 2023-05-16 中国长江电力股份有限公司 Intelligent detection method for cooling water leakage of hydropower station
CN113567066B (en) * 2021-08-09 2023-12-01 常州博瑞电力自动化设备有限公司 Voltage stabilizing device for water cooling system and leakage detection method

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100922587B1 (en) * 2002-11-12 2009-10-21 한국항공우주산업 주식회사 Leakage testing apparatus for airtight container
KR100760828B1 (en) * 2005-10-05 2007-09-21 주식회사 디섹 Leak detection apparatus
KR101182821B1 (en) * 2010-08-05 2012-09-13 대우기공 주식회사 Leak testing apparatus and method
JP5721568B2 (en) * 2011-07-01 2015-05-20 三菱日立パワーシステムズ株式会社 Cooling device and cooling water leakage detection method
KR101489789B1 (en) * 2013-04-17 2015-02-04 태원물산주식회사 Leak inspection apparatus using pressure-difference and leak inspection method

Also Published As

Publication number Publication date
WO2016159410A1 (en) 2016-10-06

Similar Documents

Publication Publication Date Title
KR101489789B1 (en) Leak inspection apparatus using pressure-difference and leak inspection method
KR101468990B1 (en) Leak inspection apparatus using pressure-difference
EP2672246B1 (en) Methods and Systems for Leak Testing
KR20200083692A (en) System for testing leakage for high-voltage battery case of vehicle
KR101659589B1 (en) Leak test apparatus and method for electronic product
KR20160116902A (en) Coolant leak inspection method
TW201300981A (en) Mass flow controller monitoring
US7899629B2 (en) Method for determining the total leak rate of systems impinged upon by pressure, and control apparatus for carrying out said method
CN110686841B (en) Air tightness detection device and detection method for double-cavity structure
KR20090021592A (en) Air conditioner eev checking method
KR20140076659A (en) Leakage test device and Leakage test method using thereof
CN105572036A (en) Method for testing sealing ability of fuel battery glue line
KR20160116901A (en) Coolant leak inspection method
CN110456250B (en) TEC refrigerating performance measuring method and measuring device
CN112484942A (en) Method and system for measuring leakage rate of small-volume container
US11781936B2 (en) Airtightness evaluation device
JPWO2006075406A1 (en) Flow rate measuring method and flow rate measuring device
KR20170060988A (en) Apparatus and method for testing digital inlet valve of diesel high pressuer pump
WO2023021606A1 (en) Airtightness testing device and airtightness testing method
JP2017116387A (en) Differential pressure change amount calculation device and differential pressure change amount calculation method
JP2010266282A (en) Device and method for leakage test
US10473549B2 (en) Fluid leak measurement test device and methods
US9810564B2 (en) Method of determining an internal volume of a filter or bag device, computer program product and a testing apparatus for performing the method
JP2001141597A (en) Temperature measuring device of leakage test device and leakage test device
KR101766125B1 (en) Method for Charging of Cooling Water by Cooling Water Pressure Sensor with Application of TMS

Legal Events

Date Code Title Description
A201 Request for examination
E902 Notification of reason for refusal
E701 Decision to grant or registration of patent right