Cage gas device for tracer gas leak detection

Abstract

The present invention discloses a caged gas device for tracer gas leak detection, comprising a support platform, a front-end collection device, an air pipe, a capillary tube, and a surrounding wall. The bottom of the support platform, the peripheral wall of the surrounding wall, and an opening form a semi-sealed space, and the capillary tube is connected to the semi-sealed space. In the caged gas device of the present invention, since the tracer gas detection head of the leak detector is in a vacuum state, the presence of the capillary tube creates a pressure differential between the detection head and the semi-sealed space, thereby forming a semi-sealed negative pressure cavity within the semi-sealed space, thereby forming a directional flow of tracer gas, ensuring that leaked tracer gas can completely enter the semi-sealed negative pressure cavity and enter the detection head through the capillary tube and the air pipe for detection. Since a local negative pressure can be formed within the semi-sealed space, a "convergence" effect is formed on the surrounding gas, making it less likely to miss detections, and leaked tracer gas will not "escape" the semi-sealed space with the local negative pressure, thereby enabling quantitative testing.

Description

Technical Field

[0001] The invention relates to a cage gas device for detecting tracer gas leaks. Background Art

[0002] Tracer gas leak detection uses a method where the detection head is placed close to the potential leak area of the object being inspected to scan and find the leak point. This method has the following two disadvantages:

[0003] 1. Easy to miss detection: The leak point is usually a very small leak hole, and the detection head may miss it or the detection head is too far away from the leak hole to detect the tracer gas signal;

[0004] 2. Unable to detect quantitatively: The tracer gas detected by the detection head is a part of the tracer gas leaked from the leak hole, so the leak rate data given by the leak detector cannot quantitatively represent the size of the leak hole.

[0005] In addition, given the wide variety of inspected products and the different shapes of the inspected areas, cage air devices with fixed shapes need to be configured one-to-one. A batch of cage air devices are required for one product, which is bound to bring great trouble in the production and use of the cage air devices. Summary of the Invention

[0006] The object of the present invention is to provide a cage gas device for tracer gas leak detection to solve at least one of the above technical problems.

[0007] According to one aspect of the present invention, there is provided a cage gas device for tracer gas leak detection, comprising:

[0008] A supporting platform, wherein the periphery of the bottom of the supporting platform is provided with a side sealing belt;

[0009] The front-end collection device is arranged at the bottom of the supporting platform;

[0010] an air pipe, one end of which passes through the supporting platform and extends from an end surface of the supporting platform;

[0011] a capillary tube, one end of the capillary tube communicating with the other end of the trachea; and

[0012] A surrounding wall body, one end of which is arranged on the supporting platform, an opening is provided on the surrounding wall body, a front-end collection device is accommodated in the surrounding wall body, and a side sealing belt around the bottom of the supporting platform is attached to the peripheral wall of the surrounding wall body so that the bottom of the supporting platform, the peripheral wall of the surrounding wall body and the opening form a semi-sealed space, and the other end of the capillary is connected to the semi-sealed space.

[0013] The caged gas device of the present invention has an air pipe extending from the end surface of the supporting platform connected to the tracer gas detection head of the leak detector, an opening on the surrounding wall contacts the detected area, and the connected capillary tube and air pipe serve as a gas passage. The semi-sealed space formed by the bottom of the supporting platform, the peripheral wall of the surrounding wall, and the opening is connected to the leak detector through the capillary tube and the air pipe. Since the tracer gas detection head of the leak detector is in a vacuum state, due to the presence of the capillary tube, a pressure difference is formed between the tracer gas detection head and the semi-sealed space, thereby forming a semi-sealed space. The negative pressure cavity can form a directional flow of the tracer gas. The semi-sealed negative pressure cavity can form a "convergence" effect on the surrounding gas, ensuring that any leaked tracer gas can enter the semi-sealed negative pressure cavity and enter the detection head of the leak detector through the capillary and the air pipe for detection. The caged air device of the present invention can form a local negative pressure within the surrounding wall in contact with the tested area, forming a "convergence" effect on the surrounding gas, making it less likely to miss detection. The leaked tracer gas will not "escape" from the semi-sealed space with local negative pressure, thus enabling quantitative testing.

[0014] Furthermore, the surrounding wall includes a plurality of columns, the bottom of each column is provided with a sealing fan blade, and the support platform is provided with a plurality of circumferentially distributed through holes along the circumference, each through hole accommodates a column and the column can rotate in the through hole.

[0015] When the driving block drives the column to rotate, the adjacent sealing blades fit together, and the sealing blades on multiple columns form a semi-sealed space with the bottom and opening of the supporting platform.

[0016] When the driving block drives the cylinder to rotate in the opposite direction, two adjacent sealing blades are separated.

[0017] Therefore, after the opening on the surrounding wall contacts the tested area, the driving block can rotate under the action of the external driving component, and the rotating driving block can drive the column to rotate, and the column will drive all the sealing blades to rotate, so that the adjacent sealing blades fit together, so that each sealing blade fits together in turn to form a circumferential sealing belt, and then the circumferential sealing belt forms a semi-sealed space together with the bottom of the supporting platform. The semi-sealed space is used to trap air. After the inspection is completed and before the next inspection, the external driving component can drive the driving block to rotate in the opposite direction, so that the two adjacent sealing blades are separated.

[0018] Furthermore, the surrounding wall body also includes multiple connecting rod shafts and multiple connecting rods. The driving block is arranged on the supporting platform and can rotate on the supporting platform. The multiple connecting rod shafts are arranged on the driving block and are distributed in a circular shape along the circumference of the driving block. One end of the connecting rod is arranged on the column, and the other end of the connecting rod is sleeved on the connecting rod shaft and can rotate on the connecting rod shaft. The number of columns, connecting rod shafts and connecting rods is the same.

[0019] Therefore, after the opening on the surrounding wall contacts the measured area, the driving block rotates under the action of the external driving component, and the rotating driving block drives the circumferentially distributed connecting rod shafts to rotate synchronously. Since the connecting rod is sleeved on the connecting rod shaft and can rotate on the connecting rod shaft, each connecting rod shaft can drive the other end of the corresponding connecting rod to swing, and the swinging connecting rod can drive the corresponding column to rotate in the through hole on the supporting platform. The rotating column will drive the sealing fan blade to rotate. Because the column, connecting rod shaft, and connecting rod correspond one to one, each column will drive the corresponding sealing fan blade to rotate, so that the adjacent sealing fan blades fit together, so that each sealing fan blade fits together in turn to form a circumferential seal. The belt is then formed with the bottom of the supporting platform into a semi-sealed space, which is used to trap air. After the inspection is completed and before the next inspection, the external driving component can drive the driving block to rotate in the opposite direction, and the driving block rotating in the opposite direction drives the connecting rod shafts distributed in the circle to rotate in the opposite direction synchronously. Each connecting rod shaft can drive the other end of the corresponding connecting rod to swing in the opposite direction, and the connecting rod swinging in the opposite direction can drive the corresponding column to rotate in the opposite direction in the through hole on the supporting platform, and the column rotating in the opposite direction will drive the sealing fan blades to rotate in the opposite direction. Therefore, each column will drive the corresponding sealing fan blades to rotate in the opposite direction, thereby separating the two adjacent sealing fan blades.

[0020] Furthermore, a cylindrical recess is provided on the top of the support platform, a convex column is provided on the inner bottom of the cylindrical recess, the driving block is annular, the driving block is accommodated in the cylindrical recess, the driving block is sleeved on the convex column and can rotate around the convex column, and the connecting rod shaft is longitudinally arranged on the top of the driving block.

[0021] Therefore, the drive block is embedded in the cylindrical recess on the top of the support platform, which can make the overall structure compact. The external drive component can drive the drive block to rotate around the boss, and the drive block can drive all the longitudinally arranged connecting rod shafts to rotate synchronously around the boss, thereby realizing the fitting or separation of adjacent sealing fan blades.

[0022] Furthermore, a through slot is provided on the column along the length direction, one end of the connecting rod is inserted into the through slot and can slide in the through slot along the length direction of the column, and the column can slide in the through hole along the length direction of the through hole.

[0023] Therefore, since the column can slide in the through hole along the length direction of the through hole, when the opening on the surrounding wall contacts the measured area, that is, the free end of the sealing fan blade on each column contacts the measured area, the free end of each sealing fan blade stops at the point where it contacts, so that all the sealing fan blades form a conformal wrapping of the measured area, which can adapt to areas with different surface shapes and adapt to test areas with different shapes. The conformal cage air design of the cage air device enables a set of cage air devices to adapt to multiple test interfaces of different products, which is ten times the test mechanism. In addition, since one end of the connecting rod is inserted into the through slot and can slide in the through slot along the length direction of the column, when the column slides in the through hole along the length direction of the through hole, the connecting rod will not interfere with the sliding of the column in the through hole.

[0024] Furthermore, the sealing fan blade includes a support plate and a sealing sleeve, one end of the support plate is arranged on the bottom of the column, the sealing sleeve is arranged on the support plate, and fan blade parts are respectively provided on both sides of the sealing sleeve along the length direction of the sealing sleeve.

[0025] Therefore, when the driving block rotates, the column drives all the sealing blades to rotate, that is, the column drives all the support plates and sealing sleeves to rotate, so that the blade parts on adjacent sealing sleeves fit together, so that the sealing sleeves on each sealing blade fit together in turn to form a circumferential sealing belt, and then the circumferential sealing belt and the bottom of the supporting platform form a semi-sealed space. The semi-sealed space is used to trap air, and the blade part can improve the sealing between adjacent sealing sleeves, ensuring the sealing of the semi-sealed space in the circumferential direction.

[0026] Furthermore, the fan blades on both sides of the sealing sleeve are respectively located at diagonal positions of the cross section of the support plate.

[0027] Therefore, since the fan blades on each sealing sleeve are arranged diagonally, when adjacent sealing sleeves are fitted together, the two fan blades on two adjacent sealing sleeves can be staggered and overlapped together, further ensuring the sealing of the semi-sealed space in the circumferential direction.

[0028] Furthermore, a contact column is provided at the free end of the support plate or the sealing sleeve.

[0029] Therefore, due to the presence of the contact column, when the free end of the sealing blade on each column, that is, the free end of the sealing sleeve on each column, contacts the measured area, the contact column can effectively reduce the gap between the free end of the sealing sleeve and the measured area, further ensuring that the leaked tracer gas can all enter the semi-sealed space, and further improving the "convergence" effect of the semi-sealed space on the surrounding gas.

[0030] Furthermore, it also includes a connecting tube, an inner concave cavity is provided on the front end collection device, one end of the connecting tube passes through the inner bottom of the inner concave cavity and is connected to the semi-sealed space, and the other end of the capillary tube is connected to the other end of the connecting tube.

[0031] Therefore, the interconnected connecting pipe, capillary tube, and gas pipe serve together as a gas channel, so that the tracer gas can be transmitted to the tracer gas detection head of the leak detector for detection.

[0032] Furthermore, a mesh filter is provided on one end of the connecting pipe.

[0033] Therefore, the mesh filter can filter out particulate impurities mixed in the tracer gas to prevent the particulate impurities from clogging the capillary. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1 This is a schematic structural diagram of a cage gas device for tracer gas leak detection according to one embodiment of the present invention;

[0035] Figure 2 for Figure 1 A cross-sectional view of the caged air device along the AA direction is shown;

[0036] Figure 3 for Figure 2 A schematic structural diagram of the support platform and front-end collection device in the caged air device shown;

[0037] Figure 4 for Figure 1 The structure diagram of part of the support platform, column, drive block, connecting rod shaft and connecting rod in the cage air device shown;

[0038] Figure 5 for Figure 1 The schematic diagram of the structure of the cylinder and the sealing fan blade in the cage air device shown;

[0039] Figure 6 for Figure 5 A side view of the column and sealing blades shown;

[0040] Figure 7 for Figure 1 The schematic diagram of the structure of the front-end collection device, connecting tube, capillary tube and trachea in the caged air device shown;

[0041] Figure 8 for Figure 1 Schematic diagram of the state in which adjacent sealing blades in the cage air device are separated;

[0042] Figure 9 for Figure 8 Schematic diagram of the state in which adjacent sealing blades in the cage air device are fitted together;

[0043] Figure 10 for Figure 8 The schematic diagram of the structure of the sealing fan blade in the cage air device shown;

[0044] Figure 11 for Figure 8 The schematic diagram of the structure of the connecting rod in the cage air device shown;

[0045] Figure 12 for Figure 1 The schematic diagram of the state of the cage air device performing shape-conforming detection on the first test area is shown;

[0046] Figure 13 for Figure 1 The caged air device is a schematic diagram of the state of shape-conforming detection of the second test area;

[0047] Figure 14 for Figure 1 Schematic diagram of the state of the cage air device performing shape-conforming detection on the third test area;

[0048] Figure 15 for Figure 1 Schematic diagram of the state of the cage air device performing shape-conforming detection on the fourth test area;

[0049] Figure 16 for Figure 1 The diagram shows a state diagram of the cage air device performing shape-conforming detection on the fifth test area. DETAILED DESCRIPTION

[0050] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0051] In the description of the present invention, it should be understood that the terms "upper", "lower", "front", "back", "left", "right", "top", "bottom", "inside", "outside" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second" and the like are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. In the description of the present invention, unless otherwise specified, "multiple" means two or more; it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected" and "set" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection, a mechanical connection, an electrical connection, a direct connection, an indirect connection through an intermediate medium, or a communication between the internal parts of two elements.

[0052] See Figures 1 to 11The caged gas device for tracer gas leak detection includes a support platform 1, a front-end collection device 2, an air pipe 3, a capillary 4 and a surrounding wall. The caged gas device may also include a drive block 6, a connecting pipe 7, a drive component, a bearing 8 and a bracket 9.

[0053] See Figure 3 The support platform 1 includes an upper support portion 15 and a lower support portion 16. The upper support portion 15 and the lower support portion 16 are connected and fixed together by a connecting column 17. The two ends of the connecting column 17 are fixed to the upper support portion 15 and the lower support portion 16 by bolts, respectively. Figure 3 and Figure 8 The upper support portion 15 is a cylindrical structure with a variable diameter. The outer wall of the lower support portion 16 is cylindrical. A side sealing belt 11 is installed and fixed on the outer wall of the lower support portion 16 along the circumference of the lower support portion 16.

[0054] See Figure 2 and Figure 3 The front-end acquisition device 2 is fixed to the bottom of the lower support portion 16 of the support platform 1, and the fixing method can be bolt fixing, snap fixing, plug fixing, etc.

[0055] See Figure 3 , the front end collecting device 2 is formed with an inner concave cavity 22, see Figure 7 The lower end of the connecting tube 7 passes through the inner bottom of the inner concave cavity 22 from the top of the front-end collection device 2, and the lower end of the connecting tube 7 is located in the inner concave cavity 22. In order to ensure sealing, a sealing ring can be installed between the connecting tube 7 and the front-end collection device 2.

[0056] See Figure 2 and Figure 7 The lower end of the capillary tube 4 is connected to the upper end of the connecting tube 7. Specifically, the lower end of the capillary tube 4 can be installed on the upper end of the connecting tube 7 through an adapter. The upper end of the capillary tube 4 is connected to the lower end of the trachea 3. Specifically, the upper end of the capillary tube 4 can be installed on the lower end of the trachea 3 through an adapter. Figure 2 The upper end of the gas pipe 3 passes through the upper support part 15 of the support platform 1 and extends from the upper end surface of the upper support part 15 of the support platform 1. The upper end of the gas pipe 3 extending from the upper end surface of the upper support part 15 is used to connect the tracer gas detection head of the leak detector.

[0057] See Figure 7 The inner diameter of the capillary tube 4 is smaller than the inner diameter of the connecting tube 7, and the inner diameter of the capillary tube 4 is also smaller than the inner diameter of the air pipe 3. The connecting tube 7, the capillary tube 4, and the air pipe 3 connected in sequence serve as a gas channel for the leaked tracer gas to enter the detection head of the leak detector for detection.

[0058] See Figure 7A mesh filter 71 is installed at the lower end of the connecting tube 7. The mesh filter 71 can filter out particulate impurities mixed in the tracer gas to prevent the particulate impurities from clogging the capillary 4.

[0059] See Figure 3 The top of the upper support portion 15 of the support platform 1 is formed with a cylindrical inner concave portion 13, and a convex column 14 is integrally formed or installed on the inner bottom of the cylindrical inner concave portion 13, see Figure 4 The driving block 6 is annular and is accommodated in the cylindrical recess 13. The driving block 6 is sleeved on the boss 14 and can rotate around the boss 14. Specifically, the driving block 6 can be installed on the boss 14 through the bearing 8 so that the driving block 6 can rotate around the boss 14. The driving block 6 is embedded in the cylindrical recess 13 at the top of the upper support part 15, which can make the overall structure compact.

[0060] See Figure 1 and Figure 2 A support frame 9 is installed on the support platform 1, and a driving component (such as a motor) is installed between the support frame 9 and the support platform 1. The driving component (such as a motor) can drive the driving block 6 to rotate around the boss 14.

[0061] One end of the surrounding wall body is installed on the upper support part 15 of the support platform 1. An opening is provided on the surrounding wall body. The front-end collection device 2 is accommodated in the surrounding wall body. The side sealing belt 11 around the lower support part 16 of the support platform 1 can be attached to the peripheral wall of the surrounding wall body so that the bottom of the lower support part 16, the peripheral wall of the surrounding wall body and the opening form a semi-sealed space.

[0062] Specifically, see Figure 1 、 Figure 2 、 Figure 8 、 Figure 9 The surrounding wall includes a plurality of columns 51, a plurality of connecting rod shafts 53 and a plurality of connecting rods 54, and the number of the columns 51, the connecting rod shafts 53 and the connecting rods 54 is the same; the upper support portion 15 of the support platform 1 is formed with a plurality of circumferentially distributed through holes 12 (see Figure 3 ), the through holes 12 are evenly distributed at equal intervals, and each through hole 12 accommodates a column 51. The column 51 can rotate freely in the through hole 12, and an anti-drop cap can be installed on the top of the column 5 to ensure that the column 51 will not fall from the through hole 12 from top to bottom.

[0063] See Figure 4 、 Figure 8 、 Figure 9 , multiple connecting rod shafts 53 are longitudinally installed on the top of the driving block 6, and multiple connecting rod shafts 53 are circumferentially distributed along the circumference of the driving block 6. The connecting rod shafts 53 are evenly distributed at equal intervals. Each column 51 is connected to the corresponding connecting rod shaft 53 through a connecting rod 54. Specifically, see Figure 11The right end of the connecting rod 54 is mounted on the column 51, and the left end of the connecting rod 54 is annular. The left end of the connecting rod 54 is sleeved on the connecting rod shaft 53, and the left end of the connecting rod 54 can rotate on the connecting rod shaft 53. Figure 8 and Figure 9 , multiple columns 51 , multiple connecting rod shafts 53 , and multiple connecting rods 54 are installed in a one-to-one correspondence, that is, one column 51 is connected to one connecting rod shaft 53 through one connecting rod 54 .

[0064] See Figure 1 、 Figure 2 、 Figure 5 、 Figure 6 A sealing fan blade 52 is installed at the bottom of each column 51. The sealing fan blade 52 includes a support plate 521 and a sealing sleeve 522. Figure 6 The upper end of the support plate 521 is fixed to the bottom of the column 51, and the sealing sleeve 522 is sleeved on the support plate 521; Figure 10 The sealing sleeve 522 is formed with fan blades 5221 on both sides along the length direction of the sealing sleeve 522. The fan blades 5221 on both sides of the sealing sleeve 522 are respectively located at the diagonal positions of the sealing sleeve 522, that is, at Figure 6 The diagonal position of the cross section of the support plate 521 is shown. Figure 8 , the driving block 6 rotates under the action of the external driving component, and the rotating driving block 6 drives the circumferentially distributed connecting rod shafts 53 to rotate synchronously. Since the connecting rod 54 is sleeved on the connecting rod shaft 53 and can rotate on the connecting rod shaft 53, each connecting rod shaft 53 can drive the corresponding connecting rod 54 to swing with the through hole 12 as the center, and the swinging connecting rod 54 can drive the corresponding column 51 to rotate in the through hole 12 on the supporting platform 1. The rotating column 51 will drive the sealing fan blade 52 to rotate. Because the column 51, the connecting rod shaft 53, and the connecting rod 54 correspond to each other one by one, each column 51 will drive the corresponding sealing fan blade 52 to rotate, so that the fan blade portion 5221 on the sealing sleeve 522 of the adjacent sealing fan blade 52 fits together, so that each sealing fan blade 52 fits together in turn to form a circumferential sealing belt ( Figure 8 The circumferential sealing band, the bottom of the lower support portion 16 and the side sealing band 11 around the lower support portion 16 form a semi-sealed space 100 (see Figure 2 ), the non-sealed end surface of the semi-sealed space 100 ( Figure 2The lower end surface shown in the figure is the opening of the surrounding wall body. The semi-sealed space 100 is used to trap air. Then the external driving component can drive the driving block 6 to rotate in the opposite direction. The driving block 6 that rotates in the opposite direction drives the connecting rod shafts 53 distributed in the circumference to rotate in the opposite direction synchronously. Each connecting rod shaft 53 can drive the corresponding connecting rod 54 to swing in the opposite direction with the through hole 12 as the center. The connecting rod 54 that swings in the opposite direction can drive the corresponding column 51 to rotate in the opposite direction in the through hole 12 on the support platform 1. The column 51 that rotates in the opposite direction will drive the corresponding sealing fan blade 52 to rotate in the opposite direction, thereby separating the fan blade portion 5221 on the sealing sleeve 522 of the adjacent sealing fan blade 52 ( Figure 9 The fan blades 5221 can improve the sealing performance between adjacent sealing sleeves 522, ensuring the sealing performance of the semi-sealed space 100 in the circumferential direction. In addition, since the fan blades 5221 on each sealing sleeve 522 are arranged diagonally, when adjacent sealing sleeves 522 are fitted together, the two fan blades 5221 on the two adjacent sealing sleeves 522 can be staggered and overlapped together ( Figure 9 The state shown in the figure) further ensures the sealing of the semi-sealed space 100 in the circumferential direction.

[0065] See Figure 5 and Figure 6 In this embodiment, a contact pin 523 is formed at the free end of the sealing sleeve 522. The width of the contact pin 523 is smaller than the width of the sealing sleeve 522 mounted on the support plate 521. Due to the presence of the contact pin 523, when the free end of the sealing blade 52 on each column 51, i.e., the free end of the sealing sleeve 522 on each column 51, contacts the measured area, the contact pin 523 can effectively reduce the gap between the free end of the sealing sleeve 522 and the measured area, further ensuring that all leaked tracer gas can enter the semi-sealed space 100, further enhancing the "convergence" effect of the semi-sealed space 100 on the surrounding gas. In other embodiments, the contact pin 523 can be disposed at the bottom of the support plate 521. When the sealing sleeve 522 is mounted on the support plate 521, the outer contour of the contact pin 523 can also be highlighted.

[0066] See Figure 2The connecting tube 7, capillary tube 4, and trachea 3 collectively serve as a gas passage. The semi-sealed space 100 can be connected to the leak detector via the connecting tube 7, capillary tube 4, and trachea 3. Since the tracer gas detection head of the leak detector is in a vacuum state, the presence of the capillary tube 4 creates a pressure differential between the tracer gas detection head and the semi-sealed space 100. This creates a semi-sealed negative pressure cavity within the semi-sealed space 100, thereby enabling a directional flow of the tracer gas. The semi-sealed negative pressure cavity can create a "convergence" effect on the surrounding gas, ensuring that any leaked tracer gas can enter the semi-sealed negative pressure cavity and enter the detection head of the leak detector through the connecting tube 7, capillary tube 4, and trachea 3 for detection. The caged air device of the present invention can create a local negative pressure within the semi-sealed space 100 in contact with the tested area, creating a "convergence" effect on the surrounding gas, making missed detections less likely. Leaked tracer gas will not "escape" from the locally negative pressured semi-sealed space 100, thus enabling quantitative testing.

[0067] See Figure 6 The column 51 is formed with a through groove 511 along the length direction, see Figure 4 One end of the connecting rod 54 is inserted into the through groove 511, and the connecting rod 54 can slide in the through groove 511 along the length direction of the column 51, that is, the column 51 can slide in the through hole 12 along the length direction of the through hole 12, and the longitudinal sliding stroke of the column 51 in the through hole 12 can be achieved by setting the length of the through groove 511 as needed. Since the column 51 can slide in the through hole 12 along the length direction of the through hole 12, when the opening of the semi-sealed space 100 contacts the measured area, that is, the free end of the sealing fan blade 52 on each column 51 contacts the measured area, the free end of each sealing fan blade 52 will stop at the point where it contacts, so that all the sealing fan blades 52 form a conformal wrapping of the measured area, which can adapt to areas with different surface shapes and conformally adapt to test areas with different shapes. In addition, since one end of the connecting rod 54 is inserted into the through groove 511 and can slide in the through groove 511 along the length direction of the column 51, when the column 51 slides in the through hole 12 along the length direction of the through hole 12, the connecting rod 54 will not interfere with the sliding of the column 51 in the through hole 12.

[0068] Figures 12 to 16 for Figure 1 The caged air device is shown in the state of shape-adaptive detection of five different test areas.

[0069] See Figure 12 , the tested area of the first test area shape 10 is planar.

[0070] See Figure 13 The measured area of the second test area shape 20 is planar, and the height of the measured area is higher than the height of the measured area of the first test area shape 10.

[0071] See Figure 14 , the tested area of the third test area shape 30 is an arch shape.

[0072] See Figure 15 , the tested area of the fourth test area shape 40 is concave.

[0073] See Figure 16 , the tested area of the fifth test area shape 50 is a corner position.

[0074] The air pipe 3 extending from the upper end surface of the upper support portion 15 of the support platform 1 is connected to the tracer gas detection head of the leak detector, and the openings on the surrounding wall are respectively contacted with the tested areas of the first test area shape 10, the second test area shape 20, the third test area shape 30, the fourth test area shape 40, and the fifth test area shape 50, that is, the free end of the sealing fan blade 52 on each column 51 will contact the tested area, and the free end of each sealing fan blade 52 will stop at the point where it contacts, so that all the sealing fan blades 52 form a conformal wrapping of the tested area of the first test area shape 10 ( Figure 12 The state shown), the second test area shape 20 of the tested area of the form of the package ( Figure 13 The state shown), the third test area shape 30 of the tested area of the form of the package ( Figure 14 The state shown), the conformal wrapping of the tested area of the fourth test area shape 40 ( Figure 15 The state shown), the fifth test area shape 50 of the tested area of the form of the package ( Figure 16The state shown), then, the driving component drives the driving block 6 to rotate a certain angle, and the driving block 6 drives the corresponding column 51 to rotate in the through hole 12 on the support platform 1 through the connecting rod shaft 53 and the connecting rod 54. Each rotating column 51 will drive the corresponding sealing fan blade 52 to rotate, so that the fan blade portion 5221 on the sealing sleeve 522 of the adjacent sealing fan blade 52 fits together, so that each sealing fan blade 52 fits together in turn to form a circumferential sealing belt, and then the circumferential sealing belt forms a bottom of the lower support part 16 and the side sealing belt 11 around the lower support part 16. A semi-sealed space is formed, which is used to trap gas. The connected connecting pipe 7, capillary tube 4 and trachea 3 serve as gas channels. The semi-sealed space is connected to the leak detector through the connecting pipe 7, capillary tube 4 and trachea 3. Since the tracer gas detection head of the leak detector is in a vacuum state, due to the existence of the capillary tube 4, a pressure difference is formed between the tracer gas detection head and the semi-sealed space, thereby forming a semi-sealed negative pressure cavity in the semi-sealed space, thereby forming a directional flow of the tracer gas. The semi-sealed negative pressure cavity can form a "convergence" effect on the surrounding gas. To ensure that the leaked tracer gas can all enter the semi-sealed negative pressure cavity and enter the detection head of the leak detector through the connecting pipe 7, the capillary tube 4, and the air pipe 3 for detection; after the detection is completed and before the next detection, the driving component can drive the driving block 6 to rotate in the opposite direction by a certain angle, and the reversely rotating driving block 6 drives the corresponding column 51 to rotate in the opposite direction in the through hole 12 on the supporting platform 1 through the connecting rod shaft 53 and the connecting rod 54. Each reversely rotating column 51 will drive the corresponding sealing fan blade 52 to rotate in the opposite direction, so that the sealing sleeve 522 of the adjacent sealing fan blade 52 The fan blade portion 5221 on the cage air device of the present invention is separated; the cage air device of the present invention can form a local negative pressure in the semi-sealed space in contact with the tested area, forming a "convergence" effect on the surrounding gas, which is less likely to cause missed detection. The leaked tracer gas will not "escape" from the semi-sealed space with local negative pressure, so quantitative testing can be performed. At the same time, it can adapt to tested areas with different surface shapes and test areas with different shapes. The shape-adaptive cage air design of the cage air device allows one set of cage air devices to adapt to multiple test interfaces of different products, which can simplify the configuration of the test organization.

[0075] The above description is only some embodiments of the present invention, which is intended to illustrate the technical means of the present invention and is not intended to limit the technical scope of the present invention. Those skilled in the art can make obvious improvements to the present invention in combination with existing common knowledge, which all fall within the scope of protection of the present invention.

Claims

1. A cage gas device for tracer gas leak detection, characterized in that: include: A support platform, wherein a side sealing belt is provided around the bottom of the support platform, and a plurality of circumferentially distributed through holes are provided on the support platform along the circumferential direction; A front-end collection device, which is arranged at the bottom of the support platform; an air pipe, one end of which passes through the support platform and extends from an end surface of the support platform; a capillary tube, one end of the capillary tube being connected to the other end of the trachea; A surrounding wall body, one end of which is disposed on the support platform, the surrounding wall body being provided with an opening, the front end collection device being accommodated in the surrounding wall body, the side sealing belt around the bottom of the support platform being attached to the peripheral wall of the surrounding wall body so that the bottom of the support platform, the peripheral wall of the surrounding wall body, and the opening form a semi-sealed space, the other end of the capillary tube being in communication with the semi-sealed space, the surrounding wall body comprising a plurality of columns, the bottoms of the columns being provided with sealing blades, a column being accommodated in each through hole and the column being capable of rotating in the through hole; and The driving block drives the cylinder to rotate, and the adjacent sealing blades fit together, and the sealing blades on the multiple cylinders form a semi-sealed space with the bottom and opening of the supporting platform. When the driving block drives the cylinder to rotate in the opposite direction, two adjacent sealing blades are separated.

2. The cage air device according to claim 1, characterized in that The surrounding wall body also includes multiple connecting rod shafts and multiple connecting rods. The driving block is arranged on the supporting platform and can rotate on the supporting platform. Multiple connecting rod shafts are arranged on the driving block and are distributed in a circular shape along the circumference of the driving block. One end of the connecting rod is arranged on the column, and the other end of the connecting rod is sleeved on the connecting rod shaft and can rotate on the connecting rod shaft. The number of columns, connecting rod shafts and connecting rods is the same.

3. The cage air device according to claim 2, characterized in that A cylindrical recess is provided on the top of the support platform, a convex column is provided on the inner bottom of the cylindrical recess, the driving block is annular, the driving block is accommodated in the cylindrical recess, the driving block is sleeved on the convex column and can rotate around the convex column, and the connecting rod shaft is longitudinally arranged on the top of the driving block.

4. The cage air device according to claim 2, characterized in that A through slot is provided on the column along the length direction, one end of the connecting rod is inserted into the through slot and can slide in the through slot along the length direction of the column, and the column can slide in the through hole along the length direction of the through hole.

5. The cage air device according to any one of claims 1 to 4, characterized in that The sealing fan blade includes a support plate and a sealing sleeve. One end of the support plate is arranged on the bottom of the column. The sealing sleeve is arranged on the support plate. Both sides of the sealing sleeve are provided with fan blade parts along the length direction of the sealing sleeve.

6. The cage air device according to claim 5, characterized in that: The fan blades on both sides of the sealing sleeve are respectively located at diagonal positions of the cross section of the support plate.

7. The cage air device according to claim 5, characterized in that The free end of the support plate or the sealing sleeve is provided with a contact column.

8. The cage air device according to claim 1, characterized in that: It also includes a connecting tube. The front end collection device is provided with an inner concave cavity. One end of the connecting tube passes through the inner bottom of the inner concave cavity and is connected to the semi-sealed space. The other end of the capillary tube is connected to the other end of the connecting tube.

9. The cage air device according to claim 8, characterized in that: A mesh filter is provided on one end of the connecting pipe.

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