CN214471598U - Profiling device for air tightness detection - Google Patents
Profiling device for air tightness detection Download PDFInfo
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- CN214471598U CN214471598U CN202120620763.1U CN202120620763U CN214471598U CN 214471598 U CN214471598 U CN 214471598U CN 202120620763 U CN202120620763 U CN 202120620763U CN 214471598 U CN214471598 U CN 214471598U
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Abstract
A profiling device for detecting air tightness comprises a profiling piece and a standard leak hole; the profiling piece is provided with a shell, the shape of the shell is similar to that of a workpiece to be detected, and the gas inlet and the inner cavity are formed in the shell and communicated with each other; the standard leak hole is fixedly arranged in the inner cavity of the shell, the top end of the standard leak hole extends into the gas inlet of the shell, and the top end of the standard leak hole is provided with a gas inlet; the outer wall of the standard leak hole is in sealing fit with the inner wall of the shell, so that gas entering the gas inlet cannot flow into the inner cavity from a place except the standard leak hole; the volume quantity of the profiling device influencing the air tightness detection system is equal to the volume quantity of the workpiece to be detected influencing the air tightness detection system. The utility model discloses can avoid conventional standard small opening when the calibration, the deviation of the volume in leak rate and the detecting system that causes the gas tightness detecting system.
Description
Technical Field
The utility model relates to an air tightness detection technology.
Background
With the rapid development of modern science and technology, people have higher requirements on various product detection technologies, wherein an air tightness detection method is used as a method for detecting whether leakage exists in a closed container, and plays an irreplaceable role in the aspect of product quality control.
Fig. 1 shows a piping system of a conventional airtightness detection system. Basic detection of the airtightness detection systemThe principle is as follows: and filling gas with fixed pressure into the gas tightness detection system from the outside, and cutting off a gas source after the gas filling is finished. After a proper stabilization time, the comparison difference (Δ P (pa/s)) between the internal pressure of the tested object 91 and the pressure of the reference object 92 (the reference object is a sealing object with the same volume as the cavity of the product to be tested) is read in a specified test period, so as to obtain the leakage rate F (cm) of the tested object3/min)。
Fig. 2 is a graph showing a change in internal pressure of a test object with time when the test object is subjected to airtightness testing using a conventional airtightness testing system. The process of the airtightness test is described below with reference to fig. 2:
an air tightness detector (not shown in the figure) inflates the pipeline system through an inflation valve 93; the pressure regulating valve 99 is used for regulating pressure;
② stabilization phase (S phase): closing the inflation valve 93, stopping inflation, and adjusting the air pressure in the pipeline system to a set air pressure by adjusting the electronic adjusting valve 94;
testing stage (T stage): closing the apparatus balance valve 95, monitoring the differential pressure between the test piece 91 and the reference piece 92 by the differential pressure sensor 96;
exhaust stage (# stage D): after the product test is complete, the vent valve 97 is opened and the apparatus vents in preparation for the next measurement.
The leak rate F is calculated by the following formula: f (cm)3And/min) = Δ P (pa/s) × k V, wherein k is an equipment constant of the airtightness detector, and V is the airtight volume of the airtightness detection system. As can be seen from the formula, the containment volume of the tightness detection system is an important parameter, and its value directly affects the value of the leakage rate.
In the working process of the air tightness detection system, impurities and oil water can enter the system, so that the test precision is influenced, and the air tightness detection system needs to be calibrated. In order to realize the calibration of the air tightness detection system, a component with known gas leakage rate, namely a standard leak hole, needs to be introduced. The conventional calibration method is that a standard leak hole 98 with known leak rate is connected to the detection end close to the detected piece in the air tightness detection system, and the setting of the closed volume parameter of the air tightness detection system is adjusted by comparing the nominal leak rate value and the actual measurement value of the standard leak hole 98.
The calibration process is illustrated below as being performed using a linear simulation method (which is prior art).
The volume parameter of the air tightness detection system arranged before calibration is assumed to be V =5.22cm3The standard leak holes 98 with different leak rates are respectively connected to the system for testing to obtain a first set of results shown in fig. 3, from which it can be seen that the actually measured value of the leak rate F is greatly different from the standard value, which indicates that the volume parameter setting value of the air tightness detecting system is improper at this time. The analysis can simulate a linear parameter of y = ax, such as: y =0.4377x, calibrated volume VSign boardV (= V) =5.22 = 1/0.4377) = 11.93. Setting the value of the volume parameter to VSign board=11.93 cm3And then, the standard leak holes with different leakage rates are respectively connected to the air tightness detection system for testing to obtain a second group of results shown in fig. 4, and as can be seen from fig. 4, the difference between the actual measured leakage rate value and the standard value of the second group is much smaller than that between the actual measured leakage rate value and the standard value of the first group, which indicates that the volume correction achieves the calibration effect.
In fig. 3 and 4, "0" indicates that the test is performed with the airtight testing system using the airtight member.
The existing calibration method has the following characteristics:
1. the leakage rate value judged by the air tightness detector is = leakage rate of a leakage hole + leakage rate of a detection system + leakage rate of connection of the leakage hole and the detection system (when the leakage hole is connected, the tightness of the connection must be paid attention to, and the leakage rate of the leakage hole and the detection system is reduced as much as possible);
2. the volume in the air tightness detection system is = the closed volume of the air tightness detection system + the volume of the standard leak hole pipeline (the volume of the standard leak hole pipeline is designed to be as short as possible).
Therefore, in the conventional calibration method, there is a difference in volume at the time of calibration from that at the time of formal test, which causes an inevitable deviation.
Disclosure of Invention
The utility model aims to solve the technical problem that a copying device for gas tightness detects is provided, it can avoid conventional standard small opening when the calibration, the deviation of the volume in leak rate and the detecting system that causes the gas tightness detecting system.
The embodiment of the utility model provides a profile modeling device for airtightness detection, which comprises a profile modeling piece and a standard leak hole; the profiling piece is provided with a shell, the shape of the shell is similar to that of a workpiece to be detected, and the gas inlet and the inner cavity are formed in the shell and communicated with each other; the standard leak hole is fixedly arranged in the inner cavity of the shell, the top end of the standard leak hole extends into the gas inlet of the shell, and the top end of the standard leak hole is provided with a gas inlet; the outer wall of the standard leak hole is in sealing fit with the inner wall of the shell, so that gas entering the gas inlet cannot flow into the inner cavity from a place except the standard leak hole; the volume quantity of the profiling device influencing the air tightness detection system is equal to the volume quantity of the workpiece to be detected influencing the air tightness detection system.
The utility model discloses at least, have following advantage:
1. when the profiling device provided by the embodiment of the utility model is used for calibrating the closed volume parameters of the air tightness detection system, the leakage rate value = leakage rate of the leak hole + leakage rate of the detection system; the volume in the air tightness detection system = the closed volume of the air tightness detection system, so that the volume in the air tightness detection system during calibration is the same as the volume in the air tightness detection system during formal test of the detected workpiece, thereby improving the accuracy during calibration and actual detection of the air tightness of the detected workpiece;
2. when the profiling device of the embodiment is used for calibrating the air tightness detection system, the standard leak hole only needs to be placed in the profiling piece, the calibration can be directly carried out, and the operation is simple and convenient.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without inventive effort.
Fig. 1 shows a schematic diagram of a piping system of a conventional airtightness detection system.
Fig. 2 is a graph showing a change in internal pressure of a test object with time when the test object is subjected to airtightness testing using a conventional airtightness testing system.
FIG. 3 shows that the volume parameter of the airtightness detection system is set to 5.22cm3And comparing the actual measured value of the leakage rate with the standard value by adopting a linear simulation method.
FIG. 4 shows that the volume parameter of the airtightness detection system is set to 11.93cm3And comparing the actual measured value of the leakage rate with the standard value by adopting a linear simulation method.
Fig. 5 and 6 show a front view schematic and a cross-sectional schematic, respectively, of a profiling device according to an embodiment of the invention.
Fig. 7 shows a schematic diagram of the parting line of the valve-regulating valve.
Fig. 8 shows a schematic view of a parting line of a profiling device according to an embodiment of the invention.
Fig. 9 shows a schematic view of the matching of the profiling device according to the present embodiment with the existing upper seal tooling and lower seal tooling when mounted in the airtightness detection system.
Detailed Description
The present invention will be further explained with reference to the accompanying drawings.
Fig. 5 and 6 show a front view schematic and a cross-sectional schematic, respectively, of a profiling device according to an embodiment of the invention. Referring to fig. 5 and 6, a profiling device 100 for airtightness detection according to an embodiment of the present invention includes a profile 1 and a standard leak hole 2.
The profile 1 has a housing 11, the shape of the housing 11 is similar to the shape of a workpiece to be detected, which needs to be subjected to gas tightness detection, the housing 11 is provided with a gas inlet 111 and an inner cavity 112, and the gas inlet 111 is communicated with the inner cavity 112.
The standard leak hole 2 is fixedly arranged in the inner cavity of the shell 11, the top end of the standard leak hole 2 extends into the gas inlet 111 of the shell, and the top end of the standard leak hole 2 is provided with a gas inlet 21; the outer wall of the standard leak 2 is in sealing engagement with the inner wall of the housing 11 so that gas entering the gas inlet 111 does not flow into the inner cavity 112 from a location other than the standard leak 2, but only flows into the inner cavity 112 through the gas inlet 21 of the standard leak 2.
In this embodiment, the inner wall of the lower end of the gas inlet 111 is provided with an internal thread, the outer side surface of the top end of the standard leak hole 2 is provided with an external thread, and the inner wall of the gas inlet 111 is spirally connected with the top end of the standard leak hole 2. A first sealing ring 31 is arranged between the outer wall of the standard leak hole 2 and the inner wall of the shell 11 to form sealing fit. Further, the standard leak 2 is provided with an annular step 23 facing upward at the outer side surface near the top end, and the first seal ring 31 is disposed between the top surface of the inner cavity 112 and the annular step 23.
In the present embodiment, the housing 11 of the cam comprises a top cover 11a and a bottom cover 11b, the top cover 11a and the bottom cover 11b being connected and jointly defining the above-mentioned inner cavity 112; the gas inlet 111 is provided in the top cover 11 a.
The inner side surface of the top cover 11a is provided with internal threads, the outer side surface of the top end of the bottom shell 11b is provided with external threads, and the inner side surface of the top cover 11a is in threaded connection with the top end of the bottom shell 11 b. The top cover 11a is provided with a convex pipe 113 protruding upwards and a through hole 118 communicating with the convex pipe 113, and the pipe hole 117 of the convex pipe 113 and the through hole 118 of the top cover 11a together form the gas inlet 111. The through hole 118 is provided with an internal thread which matches with the external thread at the top end of the standard leak 2. The top cover 11a is further provided with a positioning arm 114 protruding and extending towards one side, and the positioning arm 114 is provided with a positioning pin hole 115.
Further, a second sealing ring 32 is sleeved on the side surface of the top cover 11 a.
The profiling device 100 of the embodiment has the same volume affecting the air tightness detection system as the workpiece to be detected, so that the sealing volume during calibration is the same as the sealing volume during formal test of the workpiece to be detected, thereby improving the accuracy during calibration and actual detection of the air tightness of the workpiece to be detected.
In the following, how the profiling apparatus 100 of the present embodiment has the same volume affecting the airtightness detection system as the volume affecting the airtightness detection system by the workpiece to be inspected, will be described by taking the valve adjusting valve 9 of the vehicle as an example.
Fig. 7 shows a schematic diagram of a parting line of a valve adjusting valve as a workpiece to be inspected, and as shown in fig. 7, the valve adjusting valve 9 uses a middle parting line of a third seal ring 93 as a parting line X, and the third seal ring 93 is a seal ring sealed with an upper tool. The part structure above the parting line X is an entity, and if placed in the air tightness detection system, the sealing volume in the detection system will be reduced, and the volume quantity that the part of the valve regulating valve 9 located above the parting line X affects the air tightness detection system is defined as V1, and the part structure located below the parting line X, because of the existence of the internal cavity, which is placed in the air tightness detection system, will increase the volume in the detection system, and the volume quantity that the part of the valve regulating valve 9 located below the parting line X affects the air tightness detection system is defined as V2. The whole valve regulating valve 9 has an influence on the airtightness detection system by the following volume:
V=-V1+V2= -1377.332mm3+1559.850mm3=222.518mm3。
the values of V1 and V2 can be calculated by software simulations known in the market.
Fig. 8 shows a schematic view of a parting line of a profiling device according to an embodiment of the invention. As shown in fig. 8, the profiling device 100 uses the middle dividing line of the second sealing ring 32 as the parting line Y, wherein the second sealing ring 32 is a sealing ring sealed with the upper sealing tool 4 (shown in fig. 9), the structure of the part above the parting line Y is solid, and if the part is placed in the air tightness detection system, the sealing volume in the detection system will be reduced, and the volume quantity of the part of the profiling device 100 above the parting line Y, which affects the air tightness detection system, is defined as V3; the configuration of the part below the parting line Y, because of the presence of the internal cavity, which is placed in the tightness-detecting system, increases the volume in the detecting system, here defined as the volume quantity V4 that the portion of the profiling device 100 below the parting line Y affects the tightness-detecting system. The profiling device 100 of the present embodiment affects the airtightness detection system by the following volumetric amounts:
V=-V3+V4=-113.153mm3+335.671mm3=222.518mm3
namely V = -V1+ V2= -V3+ V4
The profiling device 100 of the present embodiment does not affect the sealing tool of the original air tightness detection system, and meanwhile, the positions and directions of the air inlet valve and the air outlet valve of the detection system do not need to be changed.
Fig. 9 shows a schematic view of the matching of the profiling device according to the present embodiment with the existing upper seal tooling 4 and lower seal tooling 5 when installed in the airtightness detection system. As shown, the locating pin 6 passes through the locating pin hole 115 of the locating arm 114 and the pin hole 55 of the seal lower tooling 5, thereby locating the profiling device 100 on the seal lower tooling 5. The upper seal fixture 4 is pressed down by its own movement mechanism, and forms a seal structure with the second seal ring 32 of the copying apparatus 100. The standard leak 2 is connected to the cam 1 by a screw thread and is sealed by a first sealing ring 31.
The utility model discloses profile modeling device can eliminate the difference that the calibration was time spent owing to the inconsistent volume brings, increases the accuracy of demarcation to the accuracy of real time measurement of work piece has been promoted.
It will be apparent to those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims and their equivalents, the present invention is also intended to include such modifications and variations.
Claims (10)
1. A profiling device for air-tightness detection, characterized in that it comprises a profile and a standard leak;
the profiling piece is provided with a shell, the shape of the shell is similar to that of a workpiece to be detected, and the gas inlet and the inner cavity are formed in the shell and communicated with each other;
the standard leak hole is fixedly arranged in the inner cavity of the shell, the top end of the standard leak hole extends into the gas inlet of the shell, and the top end of the standard leak hole is provided with a gas inlet; the outer wall of the standard leak hole is in sealing fit with the inner wall of the shell, so that gas entering the gas inlet cannot flow into the inner cavity from a place except the standard leak hole;
the volume quantity of the influence of the profiling device on the air tightness detection system is equal to the volume quantity of the influence of the workpiece to be detected on the air tightness detection system.
2. The profiling device for tightness detection according to claim 1, characterized in that a first sealing ring is provided between the outer wall of said standard leak and the inner wall of said casing to form a sealing engagement.
3. The profiling device for airtightness detection according to claim 2, wherein the standard leak is provided with an annular step having a step face upward on an outer side surface near a top end, and the first seal ring is provided between a top surface of the inner cavity and the annular step.
4. The profiling device for airtightness detection according to claim 1, wherein an inner wall of a lower end of the gas inlet is provided with an internal thread, an outer side surface of a top end of the standard leak hole is provided with an external thread, and the inner wall of the gas inlet is screw-connected to the top end of the standard leak hole.
5. The profiling device for detecting airtightness of claim 1, wherein the outer shell of the profiling member comprises a top cover and a bottom cover, the top cover being connected to the bottom cover and defining the inner cavity together; the gas inlet is disposed in the top cover.
6. The profiling device for airtightness detection according to claim 5, wherein a second seal ring is fitted around a side surface of the top cap.
7. The profiling device for airtightness detection according to claim 5, wherein the top cover has a boss tube projecting upward and a through hole communicating with the boss tube, and the tube hole of the boss tube and the through hole of the top cover together constitute the gas inlet.
8. The profiling device for detecting airtightness of claim 5, wherein the top cover is provided with a positioning arm which projects and extends to one side, and the positioning arm is provided with a positioning pin hole.
9. The profiling device for airtightness detection according to claim 5, wherein the inner side surface of the top cover is provided with an internal thread, the outer side surface of the top end of the bottom case is provided with an external thread, and the inner side surface of the top cover is screw-connected to the top end of the bottom case.
10. The profiling device for airtightness detection according to claim 1, wherein the workpiece to be inspected is a valve-regulating valve of a vehicle.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120620763.1U CN214471598U (en) | 2021-03-26 | 2021-03-26 | Profiling device for air tightness detection |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120620763.1U CN214471598U (en) | 2021-03-26 | 2021-03-26 | Profiling device for air tightness detection |
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| Publication Number | Publication Date |
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| CN214471598U true CN214471598U (en) | 2021-10-22 |
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| CN202120620763.1U Active CN214471598U (en) | 2021-03-26 | 2021-03-26 | Profiling device for air tightness detection |
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- 2021-03-26 CN CN202120620763.1U patent/CN214471598U/en active Active
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