Helium detection device and helium detection method for right-angle pipe fitting

Abstract

The invention relates to the technical field of sealing detection, in particular to a helium detection device and a helium detection method for a right-angle pipe fitting. The device comprises a vacuum box and a station table used for positioning a to-be-detected workpiece, the station table is provided with a butt joint channel communicated with a helium source and a vacuum machine, the to-be-detected workpiece is extruded by a power source on the vacuum box, and the bottom end of a vertical section of the to-be-detected workpiece is communicated with the butt joint channel in a peripheral sealing mode; the device further comprises a plugging sleeve arranged at the end of the horizontal section of the to-be-detected workpiece in a sleeving mode, a linkage pushing piece is movably installed on the station table and comprises a linkage part and a pushing part arranged beside the outer end of the plugging sleeve, and when the power source extrudes the to-be-detected workpiece, the power source is in transmission fit with the linkage part and enables the pushing part to abut against the outer end of the plugging sleeve. Synchronous sealing of all ports at the two ends of the right-angle pipe fitting workpiece can be achieved without multiple power source air cylinders, the later maintenance cost of the helium detection device is reduced, and miniaturization design of the helium detection device is facilitated.

Description

Technical Field

[0001] This invention relates to the field of sealing inspection technology, specifically to a helium testing device and method for right-angle pipe fittings. Background Technology

[0002] Vacuum chamber helium testing is a common method for detecting leaks. A helium mass spectrometer leak detector is used to determine whether helium gas leaks from the sealed interior of the workpiece into the vacuum chamber, thus determining if a leak exists. Clearly, the sealing effect at the workpiece end is a crucial factor in the accuracy of helium testing. Currently, most workpiece sealing methods are as described in the text of Chinese Patent Publication No. CN210426902U, entitled "Helium Detection Device," which uses a telescopic component to drive a clamping plate to press against the battery's injection port. The clamping plate is also connected to a nitrogen head, and the contact surface between the clamping plate and the battery under test forms a helium-filled space through the injection port.

[0003] For workpieces with only one opening, as described in the cited patent, or for workpieces with openings at both ends and parallel axial axes as in the prior art, the sealing method using a pressure plate that moves along the opening axial direction can indeed achieve a seal for all openings. However, in actual implementation, the workpiece structure may vary, as shown in the example below. Figure 5 The right-angled tubular structure shown typically requires two power source cylinders to drive two clamping plates with different directions of motion to seal both ends of the tube to achieve a seal. However, due to the stringent vacuum requirements of the vacuum chamber, if the power source cylinders used for sealing are installed inside the chamber, they must possess high sealing performance. If the cylinder body is installed outside the chamber, with only the telescopic shaft penetrating inside, then the connection between the telescopic shaft and the chamber requires high precision. Therefore, increasing the number of power source cylinders obviously increases the maintenance cost of the helium detector. Furthermore, adding more power source cylinders also increases the size of the helium detector, hindering its miniaturization design, thus requiring a solution. Summary of the Invention

[0004] To avoid and overcome the technical problems existing in the prior art, the present invention provides a helium detection device and helium detection method for right-angle pipe fittings. It can achieve synchronous sealing of all ports at both ends of the right-angle pipe fitting without the need for multiple power source cylinders, thereby reducing the later maintenance cost of the helium detection device and facilitating the miniaturization design of the helium detection device.

[0005] To achieve the above objectives, the present invention provides the following technical solution: A helium testing device for right-angle pipe fittings includes a vacuum chamber and a worktable for positioning the workpiece to be inspected. The worktable has a docking channel connecting a helium source and a vacuum machine. The workpiece to be inspected is squeezed by a power source on the vacuum chamber, causing the bottom end of its vertical section to form a peripherally sealed connection with the docking channel. The device also includes a sealing sleeve fitted onto the end of the horizontal section of the workpiece to be inspected. A linkage pusher is movably installed on the worktable. The linkage pusher includes a linkage part and a pusher part arranged beside the outer end of the sealing sleeve. When the power source squeezes the workpiece to be inspected, it engages with the linkage part in a transmission manner, causing the pusher part to perform a pressing action against the outer end of the sealing sleeve.

[0006] As a further aspect of the present invention: the linkage pusher is a V-shaped rod hinged in the middle and mounted on the worktable. The hinge axis of the V-shaped rod is arranged along the horizontal radial direction of the sealing sleeve. The two ends of the V-shaped rod are a pusher part arranged beside the outer end of the sealing sleeve and a linkage part located on the transmission path of the power source. The power source applies a driving force to the linkage part and causes the V-shaped rod to rotate, so that the pusher part performs a pressing action against the outer end of the sealing sleeve.

[0007] As a further embodiment of the present invention: a second reset spring is provided on the worktable to drive the push part to separate from the sealing sleeve.

[0008] As a further aspect of the present invention: the workpiece to be inspected is a right-angle one-way valve with a one-way valve core set in a vertical section, and the bottom end of the vertical section constitutes the inlet of the right-angle one-way valve; the workstation includes a vertical positioning hole for inserting and guiding the vertical section of the workpiece to be inspected, the docking channel is connected to the bottom of the vertical positioning hole, and a top pin for conducting the one-way valve core is installed at the bottom of the vertical positioning hole; the workstation also includes a horizontal workpiece support plate that supports and guides the sealing sleeve to slide along its own axial direction, and both sides of the bottom of the horizontal workpiece support plate are connected to the workstation via vertically arranged telescopic rods, and a first return spring for driving the horizontal workpiece support plate to return to its original position is sleeved on the telescopic rod.

[0009] As a further embodiment of the present invention: the workstation includes a fixed platform fixed to the bottom plate of the vacuum chamber, the fixed platform is provided with a workstation insertion hole for inserting a positioning mold, the vertical positioning hole and the docking through hole are both arranged on the positioning mold, and the vertical positioning hole is connected to the helium source and the vacuum machine through the docking through hole of the bottom plate of the vacuum chamber, and the outer edge of the positioning mold located at the vertical positioning hole abuts and seals with the bottom plate of the vacuum chamber.

[0010] As a further embodiment of the present invention: a vertically arranged guide shaft is fixed inside the vacuum chamber, and a pressure plate is slidably fitted on the guide shaft. The upper part of the pressure plate is connected to the power end of the power source, and the lower part of the pressure plate is detachably installed with an abutment block that can simultaneously abut against the workpiece to be inspected and the sealing sleeve. The lower outer contour of the abutment block is adapted to the upper outer contour of the workpiece to be inspected and the sealing sleeve.

[0011] As a further embodiment of the present invention: a vertically arranged guide push rod is detachably fixed on the pressure plate, and the bottom of the guide push rod has a push block that abuts against the linkage part.

[0012] As a further embodiment of the present invention: the guide push rod extends axially and forms a sliding fit with the workpiece horizontal support plate.

[0013] A helium detection method, applied to a helium detection device for a right-angle pipe fitting, includes the following steps: S1. After placing the sealing sleeve on the end of the horizontal section of the workpiece to be inspected, position the workpiece to be inspected on the worktable. S2. Start the power source, and the power source squeezes the linkage part and causes the pushing part to abut against the sealing sleeve to seal the end of the horizontal section of the workpiece to be inspected. At the same time, the power source finally squeezes the workpiece to be inspected and causes the end of the vertical section of the workpiece to be inspected to form an outer circumferential seal with the docking channel. S3. Switch the docking channel to connect with the vacuum machine, and use the vacuum machine to evacuate the workpiece to be inspected and the vacuum box to a vacuum level less than or equal to the set level. S4. Switch the docking channel to connect with the helium source and introduce helium gas at a set pressure into the inner cavity of the workpiece to be inspected. S5. The qualified leakage rate of helium gas in the vacuum chamber is detected by a helium mass spectrometer leak detector connected to the vacuum chamber through the leak detection port. When the qualified leakage rate is greater than the set value, the workpiece sealing test is unqualified. When the qualified leakage rate is less than the set value, the workpiece sealing test is qualified.

[0014] As a further aspect of the present invention: the vacuum level of the workpiece to be inspected and the vacuum chamber is set to 40 Pa; the helium pressure is set to 0.5-0.7 MPa; and the acceptable leakage rate is set to 1.0 × 10⁻⁶. -6 Pa m 3 / s.

[0015] Compared with the prior art, the beneficial effects of the present invention are: 1. While the power source is pressing the workpiece to be inspected to seal the bottom of its vertical section, it also presses the connecting part of the linkage pusher, which in turn causes the pushing part of the linkage pusher to press against the outer end of the sealing sleeve, thereby simultaneously sealing the end of the horizontal section of the workpiece to be inspected. This allows a single power source to simultaneously seal both ends of a right-angled tubular workpiece to be inspected, reducing the later maintenance cost of the helium inspection device and facilitating the miniaturization design of the helium inspection device.

[0016] 2. The linkage pusher adopts a V-shaped rod hinge rotation mechanism. When the power source comes into contact with the linkage part, it is easy to drive the V-shaped rod to rotate until the pusher part and the outer end of the sealing sleeve are pressed together. The driving process is relatively labor-saving.

[0017] 3. The workstation is equipped with a second reset spring that separates the drive unit from the sealing sleeve. This prevents the drive unit from being located on the installation path of the sealing sleeve on the workpiece to be inspected when the workpiece to be inspected is not installed, thus facilitating the rapid installation of the workpiece to be inspected.

[0018] 4. When the workpiece to be inspected is a right-angle check valve with the check valve core set in the vertical section, the workstation includes a vertical positioning hole for inserting and guiding the vertical section of the workpiece to be inspected, and a top pin for conducting the check valve core is installed at the bottom of the vertical positioning hole, so that this application can realize the helium inspection of different types of workpieces to be inspected, and improve the versatility of this application.

[0019] In addition, the horizontal support plate for the workpiece to be inspected, which supports the sealing sleeve on the workpiece to be inspected, adopts an elastic upward support method. When the workpiece to be inspected is initially placed, if the left and right movement of the one-way valve core causes the workpiece to be inspected to be unable to be directly inserted into the bottom of the vertical positioning hole, the horizontal support plate can stably guide and position the horizontal section of the workpiece to be inspected during the initial placement of the workpiece. When driven downward by the power source, the horizontal support plate can move down synchronously with the downward movement of the workpiece to be inspected, thus achieving support for the entire process from the placement of the workpiece to the sealing.

[0020] 5. The positioning mold with vertical positioning holes is inserted into the workstation socket of the fixed table. When the length or radius of the vertical section of the workpiece to be inspected changes, the installation of different models of workpieces to be inspected can be quickly adapted by replacing the positioning mold.

[0021] 6. The pressure plate slides along the guide shaft to ensure that when the abutment block abuts against the workpiece to be inspected and the sealing sleeve, the lower outline of the abutment block is accurately aligned with the upper outline of the workpiece to be inspected and the sealing sleeve, further ensuring that the installation position of the workpiece to be inspected will not be offset.

[0022] 7. The linkage is driven by a detachable guide push rod. When the length of the horizontal section changes, the travel of the drive linkage can be changed by replacing the guide push rod to adapt to the sealing and clamping of the horizontal section of different types of workpieces to be inspected.

[0023] 8. The axial extension of the guide push rod and its sliding fit with the workpiece horizontal support plate ensure that the workpiece horizontal support plate and the pressure plate remain aligned. This ensures that the groove of the guide sealing sleeve on the workpiece horizontal support plate is parallel and aligned with the groove of the lower part of the abutment block corresponding to the outer contour of the sealing sleeve, preventing positional deviation of the workpiece horizontal support plate after multiple tests.

[0024] 9. This application eliminates the need for manual clamping and sealing. During helium detection, the workpiece and vacuum chamber are evacuated to a vacuum level of 40 Pa or less, significantly reducing interference from background gases and making the helium leak signal clearer, thus enabling the detection of even minute leaks. Consequently, this application can detect leaks as low as 1.0 × 10⁻⁶ Pa. With a leakage rate of m³ / s, this high-precision detection capability is particularly important for workpieces with extremely high sealing requirements. Furthermore, this application uses a helium pressure of 0.5-0.7 MPa, which is a relatively low pressure range, meeting the detection requirements without damaging the workpiece a. Attached Figure Description

[0025] Figure 1 This is a schematic diagram of the arrangement structure of the linkage actuator in this invention.

[0026] Figure 2 This is a schematic diagram of the front view of the present invention.

[0027] Figure 3 This is a schematic diagram of the internal structure of the vacuum chamber in this invention.

[0028] Figure 4 This is a cross-sectional view of the workstation structure in this invention.

[0029] Figure 5 This is a schematic diagram of the structure of the workpiece to be inspected.

[0030] In the diagram: 10. Vacuum chamber; 11. Guide shaft; 12. Docking through hole; 20. Power source; 30. Pressure plate; 31. Abutment block; 32. Guide push rod; 321. Push block; 40. Workstation; 41. Fixed platform; 411. Workstation insertion hole; 42. Positioning mold; 43. Docking channel; 44. Vertical positioning hole; 45. Workpiece horizontal support plate; 451. Telescopic rod; 452. First return spring; 46. Top pin; 50. Linkage pusher; 51. Pushing part; 52. Linkage part; 53. Second return spring; 60. Sealing sleeve; a. Workpiece to be inspected; a1. One-way valve core. Detailed Implementation

[0031] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0032] For ease of understanding, the specific structure and operation of the present invention will be further described below with reference to the accompanying drawings: The specific structure of this invention is as follows: Figure 1-4 As shown, its main structure includes a vacuum chamber 10, a worktable 40 for positioning the workpiece a to be inspected, and a power source 20 for pressing and sealing the workpiece a to be inspected on the worktable 40.

[0033] Specifically, such as Figure 4As shown, the workstation 40 has a docking channel 43 connecting the helium source and the vacuum machine. Since the workpiece a to be inspected is a right-angled tubular structure, with one section being vertical and the other horizontal, the workpiece a is squeezed by the power source 20 on the vacuum chamber 10, causing the bottom end of its vertical section to form an outer circumferential seal with the docking channel 43. That is, the bottom opening of the vertical section of the workpiece a is aligned with the docking channel 43, and the bottom end of the vertical section abuts against the workstation 40, forming a seal at the alignment point between the bottom opening of the vertical section and the docking channel 43. Thus, the sealing operation of the bottom of the vertical section of the workpiece a is achieved through the power source 20. Furthermore, as... Figure 4 and Figure 1 As shown, this application also includes a sealing sleeve 60 fitted onto the end of the horizontal section of the workpiece a to be inspected. A linkage pusher 50 is movably installed on the workstation 40. The linkage pusher 50 includes a linkage part 52 and a pusher part 51 arranged beside the outer end of the sealing sleeve 60. When the power source 20 squeezes the workpiece a to be inspected, it engages with the linkage part 52, causing the pusher part 51 to press against the outer end of the sealing sleeve 60. That is, while the power source 20 squeezes the workpiece a to be inspected to seal its bottom vertical section, the power source also squeezes the linkage part 52 of the linkage pusher 50, thereby causing the pusher part 51 of the linkage pusher 50 to press against the outer end of the sealing sleeve 60, thus simultaneously completing the sealing of the end of the horizontal section of the workpiece a to be inspected. This achieves simultaneous sealing of both ends of the right-angled tubular workpiece a to be inspected by a single power source 20, reducing the later maintenance cost of the helium inspection device and facilitating the miniaturization design of the helium inspection device.

[0034] The specific structure of the aforementioned linkage actuator 50 is as follows: Figure 1 As shown, the linkage pusher 50 is a V-shaped rod hinged in the middle and mounted on the worktable 40. The hinge axis of the V-shaped rod is arranged along the horizontal radial direction of the sealing sleeve 60. The two ends of the V-shaped rod are a pusher part 51 arranged beside the outer end of the sealing sleeve 60 and a linkage part 52 located on the transmission path of the power source 20. The power source 20 applies a driving force to the linkage part 52, causing the V-shaped rod to rotate, so that the pusher part 51 performs a pressing action against the outer end of the sealing sleeve 60. The linkage pusher 50 adopts a rotational movement mode with a V-shaped rod hinge. When the power source 20 abuts against the linkage part 52, it is easy to drive the V-shaped rod to rotate until the pusher part 51 abuts against the outer end of the sealing sleeve 60, and the driving process is relatively labor-saving. In actual implementation, the linkage pusher 50 can also adopt a wedge block structure that slides back and forth along the axial direction of the sealing sleeve 60. The end of the wedge surface away from the sealing sleeve 60 constitutes the linkage part 52, and the side of the wedge block close to the sealing sleeve 60 constitutes the push part 51. By engaging the wedge surface of the linkage part 52 with the power source 20, the push part 51 of the wedge block is driven to press against the sealing sleeve 60, which can also achieve the technical effect required by this application. However, the driving method of the wedge engagement is more laborious and requires more power from the power source 20.

[0035] Based on the above, such as Figure 1 As shown, the workstation 40 is equipped with a second reset spring 53 that drives the push part 51 to separate from the sealing sleeve 60. This prevents the push part 51 from being located on the installation path of the sealing sleeve 60 on the workpiece a when it is not installed, thus facilitating the rapid installation of the workpiece a.

[0036] Based on the above, when the workpiece to be inspected a is a right-angle check valve with a one-way valve core a1 installed in the vertical section, and the bottom end of the vertical section constitutes the inlet of the right-angle check valve (that is, the medium enters from the bottom end of the vertical section and can open the one-way valve core a1), this application has the following implementation method.

[0037] like Figure 4 As shown, the workstation 40 includes a vertical positioning hole 44 for inserting and guiding the vertical section of the workpiece a to be inspected. A docking channel 43 is connected to the bottom of the vertical positioning hole 44, and a top pin 46 for conducting a one-way valve core a1 is installed at the bottom of the vertical positioning hole 44. The workstation 40 also includes a horizontal workpiece support plate 45 that supports and guides the sealing sleeve 60 to slide along its own axial direction. Both sides of the bottom of the horizontal workpiece support plate 45 are connected to the workstation 40 by vertically arranged telescopic rods 451, and a first return spring 452 for driving the horizontal workpiece support plate 45 to return to its original position is sleeved on the telescopic rods 451. The telescopic rod 451, combined with the first return spring 452, provides elastic support to the workpiece horizontal support plate 45. During the initial placement of the workpiece a to be inspected, when the left and right movement of the one-way valve core a1 prevents the workpiece a from being directly inserted into the bottom of the vertical positioning hole 44, the workpiece horizontal support plate 45 provides stable guidance and positioning for the horizontal section of the workpiece a during initial placement. Furthermore, when driven downwards by the power source 20, the workpiece horizontal support plate 45 moves synchronously downwards as the workpiece a slides down, providing support throughout the entire process from placement to sealing. In use, the vertical section of the workpiece a to be inspected is inserted into the vertical positioning hole 44, and the sealing sleeve 60 fitted onto the horizontal section of the workpiece a is placed on the workpiece horizontal support plate 45. Subsequently, the power source 20 is activated, causing the pushing part 51 of the linkage pusher 50 to slide and seal the end of the horizontal section of the sealing sleeve 60 along its axis. At the same time, the power source 20 drives the workpiece a to be inspected to slide downwards until the vertical section presses against the bottom of the vertical positioning hole 44, so that the bottom end of the vertical section forms a seal with the vertical positioning hole 44. Meanwhile, the bottom end of the vertical section is connected to the docking channel 43, and the bottom end of the vertical section is inserted by the top pin 46, which makes the one-way valve core a1 conduct. In addition, a vacuum can be drawn into the workpiece a to be inspected and helium can be introduced through the docking channel 43 to realize the helium inspection operation of the workpiece a with the right-angle one-way valve structure.

[0038] Based on the above, such as Figure 4As shown, the workstation 40 includes a fixed platform 41 fixed to the base plate of the vacuum chamber 10. The fixed platform 41 has a workstation insertion hole 411 for inserting a positioning mold 42. A vertical positioning hole 44 and a connecting through hole 12 are both arranged on the positioning mold 42. The vertical positioning hole 44 connects to the helium source and the vacuum machine through the connecting through hole 12 on the base plate of the vacuum chamber 10. The outer edge of the positioning mold 42 located at the vertical positioning hole 44 abuts and seals against the base plate of the vacuum chamber 10. This form of inserting the positioning mold 42 with the vertical positioning hole 44 into the workstation insertion hole 411 of the fixed platform 41 allows for quick adaptation to different models of workpieces a to be inspected when the length or radius of the vertical section of the workpiece a changes, by replacing the positioning mold 42. This detachable structure is particularly suitable for multi-station designs, allowing the replacement of several positioning molds 42 to accommodate helium inspection operations for various types of workpieces a within a single helium inspection device. Furthermore, the assembly method of the workstation socket 411 and the positioning mold 42 can be achieved by the downward pressing force of the power source 20 on the workpiece a to be inspected, so that the positioning mold 42 can be stably installed at the workstation socket 411 at the same time, which makes disassembly and assembly more convenient.

[0039] In addition, such as Figure 3 As shown, a vertically arranged guide shaft 11 is fixed inside the vacuum chamber 10. A pressure plate 30 is slidably fitted on the guide shaft 11. The upper part of the pressure plate 30 is connected to the power end of the power source 20. The lower part of the pressure plate 30 is detachably fitted with an abutment block 31 that can simultaneously abut against the workpiece to be inspected a and the sealing sleeve 60. The lower outer contour of the abutment block 31 is adapted to the upper outer contour of the workpiece to be inspected a and the sealing sleeve 60. By sliding the pressure plate 30 through the guide shaft 11, it is ensured that when the abutment block 31 abuts against the workpiece to be inspected a and the sealing sleeve 60, the lower outer contour of the abutment block 31 is accurately aligned with the upper outer contour of the workpiece to be inspected a and the sealing sleeve 60, further ensuring that the installation position of the workpiece to be inspected a will not be offset. In addition, the abutment block 31 adopts a detachable structure. When the length or radius of the horizontal section of the workpiece a to be inspected changes, resulting in changes in the length and diameter of the sealing sleeve 60, the clamping of different models of workpiece a to be inspected and the sealing sleeve 60 can be quickly adapted by replacing the abutment block 31.

[0040] In addition, such as Figure 1 As shown, a vertically arranged guide push rod 32 is detachably fixed on the pressure plate 30. The bottom of the guide push rod 32 has a push block 321 that abuts against the linkage part 52. By using the detachable guide push rod 32 to push the linkage part 52, when the length of the horizontal section changes, the active stroke of the drive linkage pusher 50 can be changed by replacing the guide push rod 32 to adapt to the sealing and pressing of the horizontal section of different models of workpiece a to be inspected.

[0041] Furthermore, such as Figure 1As shown, the guide push rod 32 extends axially and slides into the workpiece horizontal support plate 45, ensuring that the workpiece horizontal support plate 45 remains aligned with the pressure plate 30. This ensures that the groove of the guide sealing sleeve 60 on the workpiece horizontal support plate 45 is parallel and aligned with the lower part of the abutment block 31 corresponding to the outer contour groove of the sealing sleeve 60, preventing positional deviation of the workpiece horizontal support plate 45 after multiple tests. In actual implementation, the workpiece horizontal support plate 45 can also be detachably installed to accommodate guide sealing sleeves 60 of different diameters. Alternatively, the guide sealing sleeve 60 can have a larger outer diameter and a different inner diameter to accommodate different horizontal sections with varying outer diameters.

[0042] Based on the above, this application also provides a helium detection method using a helium detection device with a right-angle tube fitting, comprising the following steps: S1. After the sealing sleeve 60 is placed on the horizontal end of the workpiece a to be inspected, the workpiece a to be inspected is positioned on the worktable 40; specifically, the vertical end of the workpiece a to be inspected is inserted into the vertical positioning hole 44, and the sealing sleeve 60 is placed on the horizontal support plate 45 of the workpiece.

[0043] S2. Start the power source 20, which squeezes the linkage part 52 and causes the pushing part 51 to abut against the sealing sleeve 60 to seal the horizontal end of the workpiece a to be inspected; at the same time, the power source 20 finally squeezes the workpiece a to be inspected, and causes the vertical end of the workpiece a to be inspected to form an externally sealed connection with the docking channel 43.

[0044] S3. Switch the docking channel 43 to connect with the vacuum machine. Use the vacuum machine to evacuate the workpiece a to be inspected and the vacuum box 10 to a vacuum level less than or equal to the set vacuum level, which is 40 Pa.

[0045] S4. Switch docking channel 43 to connect with helium source and introduce helium gas at a set pressure into the inner cavity of workpiece a to be inspected. The set pressure of helium gas is 0.5-0.7 MPa.

[0046] S5. A helium mass spectrometer leak detector connected to the vacuum chamber 10 via a leak detection port is used to detect the acceptable leak rate of helium gas inside the vacuum chamber 10. The set value for the acceptable leak rate is 1.0 × 10⁻⁶. -6 Pa m 3 / s, when the qualified leakage rate is greater than the set value, the workpiece sealing test is unqualified; when the qualified leakage rate is less than the set value, the workpiece sealing test is qualified.

[0047] This application eliminates the need for manual clamping and sealing. During helium detection, the workpiece and vacuum chamber are evacuated to a vacuum level of 40 Pa or less, significantly reducing interference from background gases and making the helium leak signal clearer, thus enabling the detection of even minute leaks. Consequently, this application can detect leaks as low as 1.0 × 10⁻⁶ Pa. With a leakage rate of m³ / s, this high-precision detection capability is particularly important for workpieces with extremely high sealing requirements. Furthermore, this application uses a helium pressure of 0.5-0.7 MPa, which is a relatively low pressure range, meeting the detection requirements without damaging the workpiece a.

[0048] Of course, those skilled in the art will recognize that the present invention is not limited to the details of the exemplary embodiments described above, but also includes the same or similar structures that can be implemented in other specific forms without departing from the spirit or essential characteristics of the invention. Therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of equivalents of the claims are intended to be included within the present invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0049] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

[0050] The technologies, shapes, and structures not described in detail in this invention are all known technologies.

Claims

1. A helium detection device for a right-angled pipe fitting, characterized in that, The system includes a vacuum chamber (10) and a worktable (40) for positioning the workpiece (a) to be inspected. The worktable (40) has a docking channel (43) connecting the helium source and the vacuum machine. The workpiece (a) to be inspected is squeezed by the power source (20) on the vacuum chamber (10) so that the bottom end of its vertical section forms an externally sealed connection with the docking channel (43). The system also includes a sealing sleeve (60) fitted on the end of the horizontal section of the workpiece (a) to be inspected. A linkage pusher (50) is movably installed on the worktable (40). The linkage pusher (50) includes a linkage part (52) and a pusher part (51) arranged on the side of the outer end of the sealing sleeve (60). When the power source (20) squeezes the workpiece (a) to be inspected, it is driven and cooperates with the linkage part (52), and the pusher part (51) performs a pressing action against the outer end of the sealing sleeve (60).

2. The helium detection device for a right-angle tube according to claim 1, characterized in that, The linkage pusher (50) is a V-shaped rod hinged in the middle and mounted on the worktable (40). The hinge axis of the V-shaped rod is arranged along the horizontal radial direction of the sealing sleeve (60). The two ends of the V-shaped rod are a pusher (51) arranged on the side of the outer end of the sealing sleeve (60) and a linkage (52) located on the transmission path of the power source (20). The power source (20) applies a driving force to the linkage (52) and causes the V-shaped rod to rotate, so that the pusher (51) performs a pressing action against the outer end of the sealing sleeve (60).

3. The helium detection device for a right-angle tube according to claim 2, characterized in that, The workstation (40) is provided with a second reset spring (53) that separates the drive push part (51) from the sealing sleeve (60).

4. A helium detection device for a right-angled tube according to claim 1, 2, or 3, characterized in that, The workpiece to be inspected (a) is a right-angle one-way valve with a one-way valve core (a1) set in the vertical section, and the bottom end of the vertical section forms the inlet of the right-angle one-way valve; the workstation (40) includes a vertical positioning hole (44) for inserting and guiding the vertical section of the workpiece to be inspected (a), and a docking channel (43) is connected to the bottom of the vertical positioning hole (44), and a top pin (46) for conducting the one-way valve core (a1) is installed at the bottom of the vertical positioning hole (44); the workstation (40) also includes a workpiece horizontal support plate (45) that supports and guides the sealing sleeve (60) to slide along its own axis, and the bottom sides of the workpiece horizontal support plate (45) are connected to the workstation (40) through vertically arranged telescopic rods (451), and a first return spring (452) for driving the workpiece horizontal support plate (45) to return upward is sleeved on the telescopic rod (451).

5. The helium detection device for a right-angle tube according to claim 4, characterized in that, The workstation (40) includes a fixed platform (41) fixed to the bottom plate of the vacuum chamber (10). The fixed platform (41) is provided with a workstation insertion hole (411) for inserting the positioning mold (42). The vertical positioning hole (44) and the docking through hole (12) are both arranged on the positioning mold (42). The vertical positioning hole (44) is connected to the helium source and the vacuum machine through the docking through hole (12) of the bottom plate of the vacuum chamber (10). The outer edge of the positioning mold (42) located at the vertical positioning hole (44) is sealed to the bottom plate of the vacuum chamber (10).

6. The helium detection device for a right-angle tube according to claim 5, characterized in that, The vacuum chamber (10) is fixed with a vertically arranged guide shaft (11). A pressure plate (30) is slidably fitted on the guide shaft (11). The upper part of the pressure plate (30) is connected to the power end of the power source (20). The lower part of the pressure plate (30) is detachably installed with an abutment block (31) that can simultaneously abut against the workpiece to be inspected (a) and the sealing sleeve (60). The lower outer contour of the abutment block (31) is adapted to the upper outer contour of the workpiece to be inspected (a) and the sealing sleeve (60).

7. The helium detection device for a right-angle tube according to claim 6, characterized in that, A vertically arranged guide push rod (32) is detachably fixed on the pressure plate (30), and the bottom of the guide push rod (32) has a push block (321) that abuts against the linkage part (52).

8. The helium detection device for a right-angle tube according to claim 7, characterized in that, The guide push rod (32) passes through the axis and forms a sliding fit with the workpiece horizontal support plate (45).

9. A helium detection method, wherein the helium detection method applies a helium detection device for a right-angle pipe fitting as described in claim 1, 2, or 3, characterized in that, Includes the following steps: S1. After the sealing sleeve (60) is placed on the end of the horizontal section of the workpiece (a) to be inspected, the workpiece (a) to be inspected is positioned on the worktable (40). S2. Start the power source (20), and the power source (20) squeezes the linkage part (52) and causes the pushing part (51) to abut against the sealing sleeve (60) to seal the horizontal end of the workpiece to be inspected (a). At the same time, the power source (20) finally squeezes the workpiece to be inspected (a) and causes the vertical end of the workpiece to be inspected (a) to form an outer circumferential seal with the docking channel (43). S3. Switch the docking channel (43) to connect with the vacuum machine, and use the vacuum machine to evacuate the workpiece (a) to be inspected and the vacuum box (10) to a vacuum level less than or equal to the set vacuum level; S4. Switch the docking channel (43) to connect with the helium source and introduce helium gas at a set pressure into the inner cavity of the workpiece (a) to be inspected; S5. The helium mass spectrometer leak detector connected to the vacuum chamber (10) through the leak detection port detects the qualified leakage rate of helium in the vacuum chamber (10). When the qualified leakage rate is greater than the set value, the workpiece sealing test is unqualified. When the qualified leakage rate is less than the set value, the workpiece sealing test is qualified.

10. The helium detection method according to claim 1, characterized in that, The vacuum level of the workpiece to be inspected (a) and the vacuum chamber is set to 40 Pa; the helium pressure is set to 0.5-0.7 MPa; and the acceptable leak rate is set to 1.0 × 10⁻⁶. -6 Pa m 3 / s.

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