CN114112244A - Air tightness detection method for thin-wall pipe fitting - Google Patents
Air tightness detection method for thin-wall pipe fitting Download PDFInfo
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- CN114112244A CN114112244A CN202111481978.0A CN202111481978A CN114112244A CN 114112244 A CN114112244 A CN 114112244A CN 202111481978 A CN202111481978 A CN 202111481978A CN 114112244 A CN114112244 A CN 114112244A
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- 238000001514 detection method Methods 0.000 title claims abstract description 46
- 238000007789 sealing Methods 0.000 claims abstract description 59
- 238000005259 measurement Methods 0.000 claims abstract description 16
- 238000000034 method Methods 0.000 claims description 31
- 229920001296 polysiloxane Polymers 0.000 claims description 28
- 208000001953 Hypotension Diseases 0.000 claims description 3
- 230000036543 hypotension Effects 0.000 claims description 3
- 238000009434 installation Methods 0.000 claims description 2
- 238000012360 testing method Methods 0.000 claims description 2
- 239000002131 composite material Substances 0.000 abstract description 42
- 239000000835 fiber Substances 0.000 abstract description 39
- 230000032683 aging Effects 0.000 description 10
- 230000008569 process Effects 0.000 description 10
- 230000000694 effects Effects 0.000 description 8
- 230000005489 elastic deformation Effects 0.000 description 7
- 239000011159 matrix material Substances 0.000 description 5
- 239000011347 resin Substances 0.000 description 5
- 229920005989 resin Polymers 0.000 description 5
- 238000010586 diagram Methods 0.000 description 4
- CBENFWSGALASAD-UHFFFAOYSA-N Ozone Chemical compound [O-][O+]=O CBENFWSGALASAD-UHFFFAOYSA-N 0.000 description 2
- 230000003670 easy-to-clean Effects 0.000 description 2
- 238000010292 electrical insulation Methods 0.000 description 2
- 238000011900 installation process Methods 0.000 description 2
- 230000002045 lasting effect Effects 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 239000007769 metal material Substances 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 238000000465 moulding Methods 0.000 description 2
- 230000003647 oxidation Effects 0.000 description 2
- 238000007254 oxidation reaction Methods 0.000 description 2
- 230000035699 permeability Effects 0.000 description 2
- 230000005855 radiation Effects 0.000 description 2
- 230000009467 reduction Effects 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000000805 composite resin Substances 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 239000003973 paint Substances 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 230000035882 stress Effects 0.000 description 1
- 238000004804 winding Methods 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M3/00—Investigating fluid-tightness of structures
- G01M3/02—Investigating fluid-tightness of structures by using fluid or vacuum
- G01M3/26—Investigating fluid-tightness of structures by using fluid or vacuum by measuring rate of loss or gain of fluid, e.g. by pressure-responsive devices, by flow detectors
- G01M3/28—Investigating fluid-tightness of structures by using fluid or vacuum by measuring rate of loss or gain of fluid, e.g. by pressure-responsive devices, by flow detectors for pipes, cables or tubes; for pipe joints or seals; for valves ; for welds
- G01M3/2807—Investigating fluid-tightness of structures by using fluid or vacuum by measuring rate of loss or gain of fluid, e.g. by pressure-responsive devices, by flow detectors for pipes, cables or tubes; for pipe joints or seals; for valves ; for welds for pipes
- G01M3/2815—Investigating fluid-tightness of structures by using fluid or vacuum by measuring rate of loss or gain of fluid, e.g. by pressure-responsive devices, by flow detectors for pipes, cables or tubes; for pipe joints or seals; for valves ; for welds for pipes using pressure measurements
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Abstract
The invention relates to an air tightness detection method for a thin-wall pipe fitting, which comprises the following steps: s1, fixedly connecting a sealing element and a connecting piece with a first hose and a second hose respectively in an air-tight manner, and connecting the connecting piece with a detection system in an air-flowing manner, wherein the first hose and the second hose are fixedly sleeved on the outer surfaces of two ends of the thin-wall pipe fitting; s2, supplying air to a measurement cavity formed by the sealing element, the connecting element, the first hose, the second hose and the thin-wall pipe fitting through a connecting element by the detection system, stopping supplying air and starting timing after a calibrated air pressure value P is reached, and ending timing when the internal pressure of the measurement cavity is P1 to obtain an interval time t; and S3, calculating the air leakage rate of the thin-wall pipe fitting according to the interval time t and the volume V of the measuring cavity. The detection method of the invention can not damage the fiber composite pipe fitting, has good connection sealing performance at each position, and is simple, convenient and reliable.
Description
Technical Field
The invention relates to the technical field of air tightness detection, in particular to an air tightness detection method for a thin-wall pipe fitting.
Background
The rod and tube structure of the fiber reinforced resin-based composite material is a typical unit for forming a composite material member, is a commonly used structural component in the structures of aviation and spacecrafts, and has wide application due to the advantages of small density and light weight.
The molding of the fiber reinforced resin matrix composite pipe generally adopts the processes of fiber winding, prepreg layering, pultrusion, thermal shrinkage molding and the like, and different process methods and layering designs have larger differences in performance. Compared with metal materials, the composite material has relatively poor material compactness due to the stress and the existence of micro pores in the curing process, so that the composite material cannot meet the airtight requirement of the metal material when used as a closed structure. Particularly, the thin-wall composite pipe fitting has low rigidity and poor appearance precision, and the interface sealing in the process of detecting the air leakage rate is difficult, so that the rigid connection mode in the prior art is easy to cause the damage of the thin-wall fiber composite pipe fitting and the poor air tightness of the connection, further causing the inaccurate measurement result of the air leakage rate, and the requirement of the thin-wall fiber composite pipe fitting on the aspect of detecting the air leakage rate cannot be met.
Disclosure of Invention
Aiming at the problems in the prior art, the invention provides the air tightness detection method which can not cause the damage of the thin-wall pipe fitting made of the fiber composite material, has good air tightness of connection and can accurately measure the air leakage rate of the thin-wall pipe fitting made of the fiber composite material.
The invention provides an air tightness detection method for a thin-wall pipe fitting, which comprises the following steps:
s1, fixedly connecting a sealing element and a connecting piece with a first hose and a second hose respectively in an air-tight manner, and connecting the connecting piece with a detection system in an air-flowing manner, wherein the first hose and the second hose are fixedly sleeved on the outer surfaces of two ends of the thin-wall pipe fitting;
s2, supplying air to a measurement cavity formed by the sealing element, the connecting element, the first hose, the second hose and the thin-wall pipe fitting through the connecting element by the detection system, stopping supplying air and starting timing after a calibrated air pressure value is reached, and ending timing when the internal pressure of the measurement cavity is P1 to obtain interval time;
and S3, calculating the air leakage rate of the thin-wall pipe fitting according to the interval time and the volume of the measuring cavity.
The invention solves the problem that the existing method for detecting the air tightness of the fiber reinforced resin matrix composite pipe is not suitable for the thin-wall pipe fitting made of the fiber composite material, adopts the method for forming air tightness connection by using elasticity and rigidity matching to ensure that the air tightness of the thin-wall pipe fitting made of the fiber composite material is accurately detected, avoids the damage to the thin-wall pipe fitting made of the fiber composite material in the detection process, and can accurately reflect the air tightness of the thin-wall pipe fitting made of the fiber composite material. A new detection method is provided for measuring the air tightness of the fiber thin-wall composite pipe fitting. The method can reliably reflect the actual air tightness of the fiber reinforced resin matrix composite pipe.
The invention can calculate the air leakage rate of the thin-wall pipe fitting made of the fiber composite material by adopting a pressure drop method and combining the volume of the thin-wall pipe fitting made of the fiber composite material and the pressure drop time. In actual operation, inflating and pressurizing are carried out on a connected detection system, after the detection system is inflated to a specified pressure, air supply is stopped, the starting time is recorded, the ending time is recorded when the air pressure is close to 0, the interval time required by pressure reduction is calculated according to the starting time and the ending time, and finally, the air leakage rate of the thin-wall pipe fitting made of the fiber composite material is obtained according to the volume of the measurement cavity.
In accordance with one aspect of the present invention,
the air leakage rate S is calculated according to the following formula:
S＝ΔPV/P0t
where Δ P is the total amount of hypotension, Δ P-P1, V is the measurement cavity volume, P0Is standard atmospheric pressure, and t is the interval time.
In accordance with one aspect of the present invention,
in step S1, a first hose and a second hose are sleeved on the outer surfaces of the two ends of the thin-walled tube, the other end of the first hose is fastened to one end of the thin-walled tube by using a first spiral clamp, and the sealing element is fixedly connected with one end of the first hose in a gas-tight manner by using a second spiral clamp;
fastening one end of the second hose to the other end of the thin-walled tube using a third coil clamp;
and fixedly connecting one end of the connecting piece with the other end of the second hose in a gas sealing manner by using a fourth spiral clamp, and then connecting the other end of the connecting piece with the detection system in a gas circulation manner.
In the invention, because the elastic hose is connected with the rigid thin-wall pipe fitting made of the fiber composite material, the thin-wall pipe fitting made of the fiber composite material is effectively protected, and the air tightness of the connection part is effectively ensured. After the first hose and the second hose are sleeved at two ends of the thin-wall pipe fitting made of the fiber composite material, the first hose and the second hose are fixedly connected through a spiral clamp. The connection mode is simple and reliable, and the pressing force of the spiral clamp is utilized to enable the contact parts of the first hose and the second hose and the spiral clamp to generate elastic deformation, so that gas-tight fixed connection is formed.
In accordance with one aspect of the present invention,
the first hose and the second hose are silicone tubes, the inner diameter of each silicone tube is 5-15 mm smaller than the outer diameter of each thin-wall pipe fitting, and the wall thickness of the first hose and the wall thickness of the second hose are 3-5 mm.
In the concept of the invention, the first hose and the second silicone tube are silicone tubes, because the silicone tubes have excellent electrical insulation performance, aging resistance, chemical stability, oxidation resistance, weather resistance and radiation resistance; the composite material has physiological inertia, good air permeability and high and low temperature resistance, can be used at minus 40 ℃ to 200 ℃ for a long time, can be used for complete vacuum degree, resists rupture, twist and fatigue, has lasting fatigue resistance, smooth inner wall and is easy to clean; has excellent thermal-oxidative aging resistance, ozone aging resistance, light aging resistance and weather aging resistance.
Since silicone tubing has excellent resilience and small permanent set, in the concept of the invention the inner diameter of the silicone tubing used is 5-15 mm smaller than the outer diameter of the thin-walled tube. In the installation process, the end opening of the silicone tube is sleeved at the end part of the thin-wall pipe fitting and generates certain outward elastic deformation, the centripetal elastic force generated by the outward elastic deformation enables the silicone tube to be tightly coated at the end part of the thin-wall pipe fitting, and the centripetal elastic force well eliminates a gap at the connecting part of the silicone tube and the end part of the thin-wall pipe fitting to form certain sealing performance. The thickness of the silicone tube is 3mm-5mm, which not only can ensure that the silicone tube has enough toughness and elasticity and can be expanded to the required inner diameter, but also can ensure that the silicone tube generates certain centripetal elastic deformation when being pressed by the spiral clamp, thereby further achieving the completely sealed sealing effect.
In accordance with one aspect of the present invention,
the sealing element in the step S1 is a stepped cylinder, one end of the sealing element is a first positioning shoulder, and the other end of the sealing element is provided with a first stepped portion for connecting with the other end of the first hose, wherein the outer diameter of the first stepped portion is the same as that of the end portion of the thin-walled pipe; the diameter of the first positioning shoulder is larger than the diameter of the end part of the thin-wall pipe fitting; the length of the first step part is greater than or equal to 1/5 of the length of the first hose.
According to one aspect of the present invention, it is preferred,
the diameter of the first positioning shoulder part is at least 10mm larger than the diameter of the end part of the thin-wall pipe fitting; the length of the first step part is more than or equal to 20 mm.
The sealing piece completely seals one end of the first hose, and gas is prevented from leaking from the first hose in the detection process. In order to obtain a sealing effect without gas leakage at all, the diameter of the first positioning shoulder part is at least 10mm larger than the diameter of the end part of the thin-wall pipe fitting; the length of the first step part is more than or equal to 20 mm.
In accordance with one aspect of the present invention,
the connecting piece in the step S1 is a stepped cylinder, one end of the connecting piece is provided with a second step portion connected with the other end of the second hose, the other end of the connecting piece is a second positioning shoulder portion, the outer diameter of the second step portion is the same as that of the end portion of the thin-wall pipe fitting, the diameter of the second positioning shoulder portion is larger than that of the end portion of the thin-wall pipe fitting, and the length of the second step portion is larger than or equal to 1/10 of the length of the second hose.
The second location shoulder keep away from the fixed connector that sets up of terminal surface of second hose, the connector with the inside perforating hole that sets up of connecting piece, wherein, the connector surface sets up and is used for the external screw thread that detecting system connects.
According to one aspect of the present invention, it is preferred,
the diameter of the second positioning shoulder part is at least 10mm larger than the diameter of the end part of the thin-wall pipe fitting, and the length of the second step part is more than or equal to 20 mm;
the other end of the second hose is completely sealed by the connecting piece, so that gas cannot leak from the second hose in the detection process. In order to obtain a sealing effect without gas leakage at all, the diameter of the second positioning shoulder part is at least 10mm larger than the diameter of the end part of the thin-wall pipe fitting; the length of the second step part is more than or equal to 20 mm. The connector with the inside perforating hole that sets up of connecting piece is the vent that is used for detecting system air feed.
According to one aspect of the present invention, it is preferred,
the first step portion with second step portion excircle surface sets up the slot, the installation elasticity sealing washer in the slot.
The first step portion and the second step portion are inserted into the first hose and the second hose and are connected in an airtight manner by a third spiral clamp and a fourth spiral clamp. And an elastic sealing ring is arranged between the first step part and the second step part and between the inner diameter of the first hose and the inner diameter of the second hose, so that a better sealing effect can be obtained.
In accordance with one aspect of the present invention,
the detection system comprises a sealing pipeline arranged on the connecting piece, and a digital absolute air pressure meter, a sealing valve and an air pump which are sequentially connected with the sealing pipeline in an air-tight manner.
One end of the sealing pipeline is fixedly connected with the connector on the connecting piece in a gas sealing mode.
The invention has the following beneficial effects: in the method for detecting the air tightness of the thin-wall pipe fitting, the fiber composite pipe fitting cannot be damaged, the connection sealing performance of each part is good, the detection method is simple, convenient and reliable, and the method is particularly suitable for the thin-wall fiber composite pipe fitting with a three-dimensional space structure.
Drawings
FIG. 1 is a flow chart of one embodiment of a method of the present invention for gas tightness testing of thin-walled tubing;
FIG. 2 is a schematic diagram of one embodiment of the method of the present invention for detecting the gas-tightness of thin-walled tubing;
FIG. 3 is a schematic structural diagram of a sealing member of an embodiment of the method for detecting the gas-tightness of the thin-walled tube according to the present invention;
FIG. 4 is a schematic structural diagram of a connecting member of an embodiment of the method for detecting the gas tightness of the thin-walled tube according to the present invention;
fig. 5 is a schematic structural diagram of a fiber composite pipe according to an embodiment of the method for detecting the air tightness of the thin-walled pipe.
The reference numbers: 1-a seal; 2-a first hose; 3-a pipe fitting; 4-a second hose; 5-a connector; 6, an air pump; 7-sealing the valve; 8-digital absolute pressure gauge;
Detailed Description
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the embodiments will be briefly described below. It is obvious that the drawings in the following description are only some embodiments of the invention, and that for a person skilled in the art, other drawings can be derived from them without inventive effort.
The present invention is described in detail below with reference to the drawings and the specific embodiments, which are not repeated herein, but the embodiments of the present invention are not limited to the following embodiments.
As shown in fig. 1, an embodiment of the present invention provides an airtight performance detection method for a thin-walled tube 3, including the following steps:
s1, fixedly connecting the sealing element 1 and the connecting piece 5 with the first hose 2 and the second hose 4 respectively in an air-tight manner, and connecting the connecting piece 5 with the detection system in an air-flow manner, wherein the first hose 2 and the second hose 4 are fixedly sleeved on the outer surfaces of two ends of the thin-wall pipe fitting 3;
s2, supplying air to a measurement cavity formed by the sealing element 1, the connecting element 5, the first hose 2, the second hose 4 and the thin-wall pipe fitting 3 through the connecting element 5 by the detection system, stopping supplying air and starting timing after a calibrated air pressure value P is reached, and ending timing when the internal pressure of the measurement cavity is P1 to obtain interval time t;
and S3, calculating the air leakage rate S of the thin-wall pipe fitting 3 according to the interval time t and the measurement cavity volume V.
The method solves the problem that the existing method for detecting the air tightness of the fiber reinforced resin matrix composite pipe is not suitable for the thin-wall pipe 3 made of the fiber composite material, adopts the method of forming air tightness connection by using elasticity and rigidity matching to ensure that the air tightness of the thin-wall pipe 3 made of the fiber composite material is accurately detected, avoids damage to the thin-wall pipe 3 made of the fiber composite material in the detection process, and can accurately reflect the air tightness of the thin-wall pipe 3 made of the fiber composite material. A new detection method is provided for measuring the air tightness of the fiber thin-wall composite material pipe fitting 3. The method can reliably reflect the actual air tightness of the fiber reinforced resin matrix composite pipe.
As shown in fig. 2, fig. 3, fig. 4 and fig. 5, the air leakage rate S of the thin-walled tube 3 made of the fiber composite material can be calculated by using the pressure drop method and combining the volume of the thin-walled tube 3 made of the fiber composite material and the pressure drop time. In actual operation, inflation pressurization is carried out on a connected detection system, after inflation is carried out to a specified pressure, air supply is stopped, the starting time is recorded, the ending time is recorded when the air pressure is close to 0, the interval time t required by pressure reduction is calculated according to the starting time and the ending time, and finally the air leakage rate S of the thin-wall pipe fitting 3 made of the fiber composite material is obtained according to the volume V of the measurement cavity.
In the present embodiment, it is preferred that,
the air leakage rate S is calculated according to the following formula:
S＝ΔPV/P0t
where Δ P is the total amount of hypotension, Δ P-P1, V is the measurement cavity volume, P0Is standard atmospheric pressure, and t is the interval time.
In this embodiment, in step S1, the first hose 2 and the second hose 4 are sleeved on the outer surfaces of the two ends of the thin-walled tube member 3, the other end of the first hose 2 is fastened to one end of the thin-walled tube member 3 by using a first screw clamp, and the sealing member 1 is fixedly connected to one end of the first hose 2 in a gas-tight manner by using a second screw clamp;
fastening one end of the second hose 4 to the other end of the thin-walled tube member 3 using a third screw clamp;
after one end of the connecting piece 5 is fixedly connected to the other end of the second hose 4 in a gas-tight manner by means of a fourth screw clamp, the other end of the connecting piece 5 is connected to the detection system in a gas-flow manner.
In this embodiment, because the elastic hose is connected to the thin-walled tube 3 made of rigid fiber composite material, the thin-walled tube 3 made of fiber composite material is effectively protected, and the air tightness of the joint is effectively ensured. After the first hose 2 and the second hose 4 are sleeved at two ends of the thin-wall pipe fitting 3 made of the fiber composite material, the first hose and the second hose are fixedly connected by a spiral clamp. The connection mode is simple and reliable, and the pressing force of the spiral clamp is utilized to elastically deform the contact parts of the first hose 2 and the second hose 4 and the spiral clamp, so that gas-tight fixed connection is formed.
In the present embodiment, it is preferred that,
the first hose 2 and the second hose 4 are silicone tubes, the inner diameter of each silicone tube is 5mm-15mm smaller than the outer diameter of the thin-wall pipe 3, and the wall thickness of the first hose 2 and the wall thickness of the second hose 4 are 3mm-5 mm.
In this embodiment, the first hose 2 and the second silicone tube are silicone tubes, because the silicone tubes have excellent electrical insulation performance, aging resistance, chemical stability, oxidation resistance, weather resistance and radiation resistance; the paint has physiological inertia, good air permeability and high and low temperature resistance, can be used for a long time at-40-200 ℃, can be used for complete vacuum degree, resists rupture, twist and fatigue, has lasting fatigue resistance, smooth inner wall and is easy to clean; has excellent thermal-oxidative aging resistance, ozone aging resistance, light aging resistance and weather aging resistance.
Since silicone tubing has excellent resilience and small permanent set, in this embodiment silicone tubing having an inner diameter that is 5mm-15mm smaller than the outer diameter of the thin-walled tube 3 is used. In the installation process, the end of the silicone tube is sleeved on the end of the thin-wall tube 3 and generates certain outward elastic deformation, the centripetal elastic force generated by the outward elastic deformation enables the silicone tube to tightly cover the end of the thin-wall tube 3, and the centripetal elastic force well eliminates a gap at the joint of the silicone tube and the end of the thin-wall tube 3, so that certain sealing performance is formed. The thickness of the silicone tube is 3mm-5mm, which not only can ensure that the silicone tube has enough toughness and elasticity and can be expanded to the required inner diameter, but also can ensure that the silicone tube generates certain centripetal elastic deformation when being pressed by the spiral clamp, thereby further achieving the completely sealed sealing effect.
In the present embodiment, it is preferred that,
the sealing element 1 in the step S1 is a stepped cylinder, one end of the sealing element is a first positioning shoulder, and the other end of the sealing element is provided with a first stepped portion for connecting with the other end of the first hose 2, wherein the diameter of the outer circle of the first stepped portion is the same as that of the end of the thin-wall pipe fitting 3; the diameter of the first positioning shoulder is larger than the diameter of the end part of the thin-wall pipe fitting 3; the length of the first step is equal to or greater than 1/5 of the length of the first hose 2.
In the present embodiment, it is preferred that,
the diameter of the first positioning shoulder part is at least 10mm larger than the diameter of the end part of the thin-wall pipe fitting 3; the length of the first step part is more than or equal to 20 mm.
The sealing member 1 completely seals one end of the first flexible pipe 2, and ensures that gas cannot leak from the first flexible pipe 2 in the detection process. In order to obtain a sealing effect without gas leakage at all, the diameter of the first positioning shoulder part is at least 10mm larger than the diameter of the end part of the thin-wall pipe fitting 3; the length of the first step part is more than or equal to 20 mm.
In the present embodiment, it is preferred that,
the connecting member 5 in step S1 is a stepped cylinder, one end of the connecting member is provided with a second step portion for connecting with the other end of the second hose 4, the other end of the connecting member is a second positioning shoulder, the outer diameter of the second step portion is the same as the outer diameter of the end portion of the thin-walled tube 3, the diameter of the second positioning shoulder is larger than the diameter of the end portion of the thin-walled tube 3, and the length of the second step portion is equal to or greater than 1/10 of the length of the second hose 4.
The end face of the second positioning shoulder part far away from the second hose 4 is fixedly provided with a connector, the connector and the connector 5 are internally provided with through holes, and the outer surface of the connector is provided with external threads for connecting a detection system.
In the present embodiment, it is preferred that,
the diameter of the second positioning shoulder part is at least 10mm larger than the diameter of the end part of the thin-wall pipe fitting 3, and the length of the second step part is more than or equal to 20 mm;
the other end of the second hose 4 is completely sealed by the connector 5, which ensures that gas does not leak from the second hose 4 during the detection process. In order to obtain a sealing effect without gas leakage at all, the diameter of the second positioning shoulder part is at least 10mm larger than the diameter of the end part of the thin-wall pipe fitting 3; the length of the second step part is more than or equal to 20 mm. The through holes arranged in the connector and the connecting piece 5 are air vents for air supply of the detection system.
In the present embodiment, it is preferred that,
the outer circle surfaces of the first step part and the second step part are provided with grooves, and elastic sealing rings are installed in the grooves.
The first step portion and the second step portion are inserted into the first hose 2 and the second hose 4, and are connected in an airtight manner by a third spiral clamp and a fourth spiral clamp. The elastic sealing ring is arranged between the first step part and the second step part and between the inner diameter of the first hose 2 and the inner diameter of the second hose 4, so that a better sealing effect can be obtained.
In the present embodiment, it is preferred that,
the detection system comprises a sealing pipeline arranged on the connecting piece 5, and a digital absolute pressure gauge 8, a sealing valve 7 and an air pump 6 which are sequentially connected with the sealing pipeline in an air-tight manner.
One end of the sealing pipeline is fixedly connected with the connector on the connecting piece 5 in a gas sealing way.
In the method for detecting the air tightness of the thin-wall pipe 3, the fiber composite pipe 3 cannot be damaged, the connection sealing performance of each part is good, the detection method is simple, convenient and reliable, and the method is particularly suitable for the thin-wall fiber composite pipe 3 with a three-dimensional space structure.
The foregoing is merely exemplary of particular aspects of the present invention and devices and structures not specifically described herein are understood to be those of ordinary skill in the art and are intended to be implemented in such conventional ways.
The above is only one embodiment of the present invention, and is not intended to limit the present invention, and various modifications and changes may be made to the present invention by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. The method for detecting the air tightness of the thin-wall pipe is characterized by comprising the following steps of:
s1, fixedly connecting a sealing element (1) and a connecting piece (5) with a first hose (2) and a second hose (4) respectively in a gas sealing manner, and connecting the connecting piece (5) with a detection system in a gas circulation manner, wherein the first hose (2) and the second hose (4) are fixedly sleeved on the outer surfaces of two ends of the thin-wall pipe fitting (3);
s2, supplying air to a measurement cavity formed by the sealing element (1), the connecting element (5), the first hose (2), the second hose (4) and the thin-wall pipe fitting (3) through a connecting element (5) by the detection system, stopping supplying air and starting timing after a calibrated air pressure value (P) is reached, and ending timing when the internal pressure of the measurement cavity is P1 to obtain an interval time (t);
s3, calculating the air leakage rate (S) of the thin-wall pipe (3) according to the interval time (t) and the measurement cavity volume (V).
2. The method for testing the gas-tightness properties of thin-walled tube according to claim 1, wherein,
the air leakage rate (S) is calculated according to the following formula:
S＝ΔPV/P0t
where Δ P is the total amount of hypotension, Δ P-P1, V is the measurement cavity volume, P0Is standard atmospheric pressure, and t is the interval time.
3. The airtightness detection method for a thin-walled tube according to claim 2, wherein,
in step S1, a first hose (2) and a second hose (4) are sleeved on the outer surfaces of the two ends of a thin-walled pipe (3), the other end of the first hose (2) is fastened to one end of the thin-walled pipe (3) by using a first spiral clamp, and the sealing element (1) is fixedly connected with one end of the first hose (2) in a gas-tight manner by using a second spiral clamp;
fastening one end of the second hose (4) to the other end of the thin-walled tube (3) using a third screw clamp;
and fixedly connecting one end of the connecting piece (5) with the other end of the second hose (4) in a gas sealing manner by using a fourth spiral clamp, and then connecting the other end of the connecting piece (5) with a detection system in a gas circulation manner.
4. The airtightness detection method for a thin-walled tube according to claim 3, wherein,
the first hose (2) and the second hose (4) are silicone tubes, the inner diameter of each silicone tube is 1-5 mm smaller than the outer diameter of the thin-wall pipe fitting (3), and the wall thickness of the first hose (2) and the wall thickness of the second hose (4) range from 1mm to 5 mm.
5. The airtightness detection method for a thin-walled tube according to claim 4, wherein the sealing member (1) in the step S1 is a stepped cylinder, one end of which is a first positioning shoulder, and the other end of which is provided with a first stepped portion for connecting with the other end of the first hose (2), wherein the outer diameter of the first stepped portion is the same as the outer diameter of the end portion of the thin-walled tube (3); the diameter of the first positioning shoulder is larger than the end diameter of the thin-walled tube (3); the length of the first step part is greater than or equal to 1/5 of the length of the first hose (2).
6. The airtightness detection method for a thin-walled tube according to claim 5, wherein,
the diameter of the first positioning shoulder part is at least 10mm larger than the end part diameter of the thin-wall pipe fitting (3); the length of the first step part is more than or equal to 20 mm.
7. The airtightness detection method for thin-walled tube according to claim 6, wherein the connection member (5) in the step S1 is a stepped cylinder, one end of which is provided with a second step portion for connecting with the other end of the second hose (4), and the other end of which is a second positioning shoulder portion, the outer diameter of the second step portion is the same as the outer diameter of the end portion of the thin-walled tube (3), the diameter of the second positioning shoulder portion is larger than the diameter of the end portion of the thin-walled tube (3), and the length of the second step portion is equal to or greater than 1/5 of the length of the second hose (4);
the second location shoulder keep away from the fixed connector that sets up of terminal surface of second hose (4), the connector with inside perforating hole that sets up of connecting piece (5), wherein, the connector surface sets up and is used for the external screw thread that detecting system connects.
8. The airtightness detection method for a thin-walled tube according to claim 7, wherein,
the diameter of the second positioning shoulder part is at least 10mm larger than the diameter of the end part of the thin-wall pipe fitting (3), and the length of the second step part is more than or equal to 20 mm.
9. The airtightness detection method for a thin-walled tube according to claim 8, wherein,
the first step portion with second step portion excircle surface sets up the slot, the installation elasticity sealing washer in the slot.
10. The airtightness detection method for a thin-walled tube according to claim 9, wherein,
the detection system comprises a sealing pipeline arranged on the connecting piece (5), and a digital absolute pressure meter, a sealing valve (7) and an air pump (6) which are sequentially connected with the sealing pipeline in an air-tight manner;
one end of the sealing pipeline is fixedly connected with the connector on the connecting piece (5) in a gas sealing manner.
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| CN202111481978.0A CN114112244A (en) | 2021-12-07 | 2021-12-07 | Air tightness detection method for thin-wall pipe fitting |
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