Air tightness detection device for ceramic body flange welding assembly

Abstract

The utility model relates to the technical field of flange detection, and discloses an air tightness detection device for a ceramic body flange welding assembly. The device comprises a base and a sealing piece, an opening is formed in the top of the base, a flange plate is arranged on the opening in a lap joint mode, the sealing piece is attached to the upper portion of the base and covers the flange plate, and therefore a gas applying cavity used for being connected with a helium source is formed above the flange plate, and a leakage detecting cavity used for being connected with a helium mass spectrometer detector is formed below the flange plate; the top end of the capillary tube is welded on the flange plate and extends into the air applying cavity, and the bottom end penetrates through the leakage detecting cavity and then extends into a sealing cavity; the detection device further comprises an enclasping mechanism used for enclasping the outer side of the bottom end of the capillary tube so as to isolate communication between the leakage detection cavity and the sealing cavity, and the air applying cavity is communicated with the sealing cavity through the interior of the capillary tube. The utility model has the advantages of low assembly difficulty and perfect detection function.

Description

Technical Field

[0001] The utility model relates to the technical field of flange detection, in particular to an airtightness detection device for a ceramic flange welding assembly. Background Art

[0002] Ceramic flange welding components are mainly used in relays on new energy charging piles to play the role of automatic adjustment and circuit conversion. Figure 1 As shown in the figure, the ceramic flange welding assembly is mainly composed of a ceramic flange plate, and metal parts such as a capillary, a copper pole, a Kovar ring and a Kovar nail welded on the flange. The assembly needs to be tested for airtightness during the processing.

[0003] In the existing technology for detecting the air tightness of flanges, a flange is usually used to form a sealed space, and then helium is injected into the sealed space. A helium mass spectrometer is used to detect the amount of helium leakage outside the sealed space to perform leak detection. For example, the Chinese utility model patent with publication number CN217878212U discloses a leak detection device for insulating flanges, which uses a seal to encapsulate and fix the insulating flange, thereby performing air tightness detection on the insulating flange. However, this method is not suitable for the above-mentioned ceramic flange welding assembly. This is because it is easily restricted by multiple welded metal parts during encapsulation and fixation, and the assembly is difficult. At the same time, improper operation can easily damage the metal parts, especially the capillary tubes therein, which are relatively thin and fragile. Moreover, the pipe structure of the capillary tubes also needs to be tested for air tightness like the flanges. The existing technology cannot achieve comprehensive detection.

[0004] Therefore, the current ceramic flange welding assembly has the defects of difficult assembly and imperfect detection function when conducting air tightness testing, which needs to be solved urgently. Utility Model Content

[0005] In order to solve the technical problems existing in the prior art, the utility model provides an airtightness detection device for a ceramic flange welding assembly, which can be placed on the base opening to ensure that the capillary can reach the sealing cavity, and with the assistance of the seal and the clamping mechanism, a comprehensive and comprehensive airtightness detection can be performed on both the flange and the capillary, taking into account the advantages of low assembly difficulty and complete detection function.

[0006] To achieve the above objectives, the present invention provides the following technical solutions:

[0007] The utility model discloses an airtightness detection device for a ceramic flange welding assembly, comprising a base and a sealing member, wherein an opening is provided on the top of the base, and the sealing member can be fitted on the base and cover the opening to form a chamber; a flange is placed on the opening to divide the upper and lower parts of the chamber into an air supply chamber for connecting to a helium source and a leak detection chamber for connecting to a helium mass spectrometer; the top end of a capillary tube extends into the air supply chamber, and the bottom end passes through the leak detection chamber and then extends into a sealed chamber; the detection device also comprises a clamping mechanism for clamping the bottom end of the capillary tube from the outside to isolate the leak detection chamber and the sealed chamber from being connected, and the air supply chamber is connected to the sealed chamber through the interior of the capillary tube.

[0008] As a further improvement of the above solution, the clamping mechanism includes a linear actuator and an O-ring slidably arranged in the sealing cavity; the bottom end of the capillary passes through the center of the O-ring from top to bottom, and there is a fitting gap between the inner side of the O-ring and the outer side of the capillary; the linear actuator is relatively fixed to the base, and the piston end of the linear actuator can squeeze the O-ring along the axial direction of the sealing cavity, causing the O-ring to produce radial deformation and clamp the capillary, thereby eliminating the fitting gap.

[0009] As a further improvement of the above scheme, the clamping mechanism also includes a top column; one end of the top column is fixedly connected to the piston end, and the other end constitutes an extrusion end for axially extruding the O-ring at the piston end, and the extrusion end is provided with a blind hole for avoiding the capillary during linear movement.

[0010] As a further improvement of the above solution, two O-rings are stacked; the clamping mechanism also includes a deformation guide washer located between the two O-rings; the upper and lower ends of the deformation guide washer are arranged with sloped guide recesses sinking toward the center.

[0011] As a further improvement of the above scheme, the detection device also includes a support; the support is provided with a channel running through it from top to bottom, the top of the support and the bottom of the base are detachably fixed, and the bottom of the support and the linear actuator are detachably fixed, thereby sealing both ends of the channel to form a sealed cavity.

[0012] As a further improvement of the above scheme, the detection device also includes a copper tube protective sleeve; the copper tube protective sleeve is fixedly inserted into the through hole opened at the bottom of the base; the top of the copper tube protective sleeve is located in the leak detection cavity, and the bottom of the copper tube protective sleeve is located between the base and the support; the capillary tube passes through the copper tube protective sleeve and extends into the sealed cavity.

[0013] As a further improvement of the above solution, a plurality of mounting holes distributed in a circular array are provided on the base; the base is fixed to the carrier through the mounting holes.

[0014] As a further improvement of the above solution, the detection device also includes a mechanical arm for fixing the seal and driving the seal to fit into or away from the base.

[0015] As a further improvement of the above solution, a cuttable ring is welded on the top of the flange, the diameter of the flange is smaller than the diameter of the opening, and the diameter of the cuttable ring is larger than the diameter of the opening; the flange is placed on the opening through the cuttable ring, and the seal is crimped on the edge of the cuttable ring.

[0016] As a further improvement of the above solution, the linear actuator adopts a cylinder, a hydraulic cylinder or a linear motor.

[0017] Compared with the prior art, the beneficial effects of the present invention are:

[0018] 1. When using this utility model, simply place the ceramic flange welding assembly on the base opening to ensure that the capillary tube can reach the sealed cavity. The assembly operation is simple. Through the seal and clamping mechanism, one side of the flange and the interior of the capillary tube form a gas chamber for filling with helium, thereby performing a comprehensive airtightness test.

[0019] 2. This utility model uses a linear piston to compress the O-ring, generating radial deformation, which can quickly switch the connection between the sealing chamber and the detection chamber, ensuring detection efficiency and accuracy. Furthermore, the soft O-ring is less likely to damage the delicate copper capillary. The piston end's top post and blind hole avoidance further ensure safe capillary detection. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a schematic diagram of the three-dimensional structure of a ceramic flange welding assembly.

[0021] Figure 2 This is a three-dimensional structural diagram of the airtightness detection device for a ceramic flange welding assembly in an embodiment of the present utility model (the sealing component and the mechanical arm are hidden).

[0022] Figure 3 For this utility model Figure 2 A cross-sectional view of the airtightness detection device in the main viewing direction.

[0023] Figure 4 for Figure 3 The three-dimensional structure diagram of the base.

[0024] Figure 5 for Figure 3 A three-dimensional structural diagram of the linear actuator and top column.

[0025] Figure 6 for Figure 3 Three-dimensional structural diagram of the support.

[0026] Figure 7 for Figure 3 A three-dimensional structural diagram showing the relative positions of the capillary, O-ring and deformation guide gasket.

[0027] Figure 8 for Figure 7 The three-dimensional structure diagram of the deformation guide washer.

[0028] Figure 9 This is a schematic diagram of the detection device of the present invention when it is filled with helium for air tightness testing (the blue filled area represents the helium filling area).

[0029] In the figure: 1. Base; 10. Opening; 11. Leak detection chamber; 12. Mounting hole; 13. Through hole; 2. Seal; 21. Air application chamber; 3. Support; 31. Sealing chamber; 41. Flange; 42. Capillary; 43. Copper pole; 44. Cutting ring; 45. Cutting pin; 5. Clamping mechanism; 51. Linear actuator; 511. Piston end; 52. O-ring; 53. Push pin; 530. Blind hole; 54. Deformation guide washer; 6. Copper tube protective cover; 7. Robotic arm. DETAILED DESCRIPTION

[0030] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0031] See also Figure 1 The ceramic flange welding assembly includes a flange 41, a capillary 42, a copper pole 43, a kovar ring 44 and a kovar nail 45 welded to the flange 41.

[0032] See also Figure 2 This embodiment provides an airtightness detection device for a ceramic flange welding assembly, including a base 1, a seal 2 and a clamping mechanism 5, and may also include a support 3, a copper tube protective cover 6 and a robotic arm 7.

[0033] The top of the base 1 is provided with an opening 10 for receiving a flange 41. The diameter of the flange 41 is smaller than that of the opening 10, and the diameter of the foldable ring 44 is larger than that of the opening 10. The flange 41 can be placed on the opening 10 through the foldable ring 44, thereby being suspended above the opening 10.

[0034] The seal 2 is a semi-enclosed bowl-shaped cover that fits upside down on the base 1 and covers the flange 41. This creates a gas supply cavity 21 above the flange 41 for accessing the helium source, and a leak detection cavity 11 below the flange 41 for accessing the helium mass spectrometer. The edge of the foldable ring 44 is press-fitted to the base 1 by the seal 2 to ensure airtightness at the joint.

[0035] The seal 2 can be fixed on a robotic arm 7, which can drive the seal 2 to fit into or away from the base 1. The form of the robotic arm 7 can be selected by the user, such as linear motion or multi-degree-of-freedom motion.

[0036] In addition, the base 1 is provided with a plurality of mounting holes 12 distributed in a circumferential array, and the base 1 can be fixed to a platform or other equipment through the mounting holes 12. The bottom wall of the opening 10 of the base 1 is also provided with a through hole 13 for installing the copper tube protective cover 6.

[0037] The support 3 is provided with a channel running through it from top to bottom. The top of the support 3 is detachably fixed to the bottom of the base 1 , and the bottom of the support 3 is detachably fixed to the linear actuator 51 , thereby sealing both ends of the channel to form a sealed cavity 31 .

[0038] The copper tube protective sleeve 6 is fixedly inserted into the through hole 13 opened at the bottom of the base 1 ; the top of the copper tube protective sleeve 6 is located in the leak detection cavity 11 , and the bottom of the copper tube protective sleeve 6 is located between the base 1 and the support 3 .

[0039] The top end of the capillary tube 42 is welded to the flange 41 and extends into the air supply chamber 21. The bottom end passes through the leak detection chamber 11 and the copper tube protective sleeve 6 and then extends into the sealed chamber 31. The air supply chamber 21 is connected to the sealed chamber 31 through the internal channel of the capillary tube 42. The air inlet source of the sealed chamber 31 is only the bottom end of the capillary tube 42; all other positions are sealed.

[0040] The clamping mechanism 5 is used to clamp the outer side of the bottom end of the capillary tube 42 to isolate the leak detection chamber 11 from the sealing chamber 31. The air application chamber 21 is connected to the sealing chamber 31 through the interior of the capillary tube 42. Specifically, the clamping mechanism 5 includes a linear actuator 51 and an O-ring 52 slidably disposed within the sealing chamber 31. It may also include a top post 53 and a deformation guide washer 54.

[0041] The linear actuator 51 may be a pneumatic cylinder, a hydraulic cylinder, or a linear motor. In this embodiment, a pneumatic cylinder is used and driven by compressed air.

[0042] The center of the O-ring 52 is penetrated by the bottom end of the capillary 42, and there is a fitting gap between the inner side of the O-ring 52 and the outer side of the capillary 42; the linear actuator 51 is relatively fixed to the base 1, and the piston end 511 of the linear actuator 51 is threadedly connected to the top column 53. The top column 53 can squeeze the O-ring 52 along the axial direction of the sealing cavity 31 as the piston end 511 is driven, causing the O-ring 52 to produce radial deformation and hold the capillary 42 tightly, thereby eliminating the fitting gap.

[0043] A blind hole 530 is formed at the extrusion end of the top post 53 for avoiding the capillary tube 42 during linear movement.

[0044] In this embodiment, the O-rings 52 can be made of a soft material such as rubber or silicone. Two O-rings 52 are stacked together, and the deformation guide washer 54 is located between the two O-rings 52. The upper and lower sides of the deformation guide washer 54 are both inclined downward toward the center. In this way, when the O-ring 52 and the deformation guide washer 54 are squeezed to the end of the sealing cavity 31 and abut against the copper tube protective sleeve 6, the O-ring 52 can be guided by the slope of the deformation guide washer 54, easily deforming in the radial direction.

[0045] When the above-mentioned detection device is in use, the flange 41 can be placed in the opening 10, the ferrule 44 can be placed on the upper surface of the base 1, and the capillary 42 can be inserted from the copper tube protective sleeve 6 into the sealed cavity 31 below to ensure that the ceramic flange welding assembly is assembled. Then the robotic arm 7 can be controlled to fit the seal 2 to the base 1 and press the ferrule 44; the clamping mechanism 5 can be controlled to clamp the bottom end of the capillary 42 to isolate the connection between the detection cavity 11 and the sealed cavity 31. Then, helium is injected into the gas application cavity 21 at a regular or quantitative rate through the interface on the seal 2, such as Figure 9 As shown, the blue area is filled with helium at a certain pressure. During this period, a helium mass spectrometer connected to the detection cavity 11 through an interface is used to detect the helium content in the detection cavity 11 in real time. If the helium content is always maintained below the safe value, it means that the flange 41 itself, each weld and the pipe wall of the capillary 42 are all airtight. Otherwise, it means that there is a defect.

[0046] The above is only a preferred specific implementation method of the present invention, but the protection scope of the present invention is not limited to this. Any technician familiar with the technical field within the technical scope disclosed by the present invention can make equivalent replacements or changes based on the technical solution and utility model concept of the present invention, which should be covered by the protection scope of the present invention.

Claims

1. An airtightness detection device for a ceramic flange welding assembly, characterized in that: The invention comprises a base (1) and a sealing member (2), wherein an opening (10) is provided on the top of the base (1), and the sealing member (2) can be attached to the base (1) and cover the opening (10) to form a chamber; a flange (41) is placed on the opening (10) to divide the upper and lower parts of the chamber into an air supply chamber (21) for connecting to a helium source and a leak detection chamber (11) for connecting to a helium mass spectrometer; the top end of the capillary (42) extends into the air supply chamber (21), and the bottom end passes through the leak detection chamber (11) and then extends into a sealed chamber (31); the detection device also comprises a clamping mechanism (5) for clamping the bottom end of the capillary (42) from the outside to isolate the leak detection chamber (11) from being in communication with the sealed chamber (31); the air supply chamber (21) is in communication with the sealed chamber (31) through the interior of the capillary (42).

2. The airtightness detection device for a ceramic flange welding assembly according to claim 1, characterized in that: The clamping mechanism (5) includes a linear actuator (51) and an O-ring (52) slidably arranged in a sealing cavity (31); the bottom end of the capillary (42) passes through the center of the O-ring (52) from top to bottom, and a matching gap exists between the inner side of the O-ring (52) and the outer side of the capillary (42); the linear actuator (51) and the base (1) are relatively fixed, and the piston end (511) of the linear actuator (51) can squeeze the O-ring (52) along the axial direction of the sealing cavity (31), so that the O-ring (52) produces radial deformation and clamps the capillary (42), thereby eliminating the matching gap.

3. The airtightness detection device for a ceramic flange welding assembly according to claim 2, characterized in that: The clamping mechanism (5) further comprises a top column (53); one end of the top column (53) is fixedly connected to the piston end (511), and the other end constitutes an extrusion end for axially extruding the O-ring (52) by the piston end (511), and the extrusion end is provided with a blind hole (530) for avoiding the capillary (42) during linear motion.

4. The airtightness detection device for a ceramic flange welding assembly according to claim 2, characterized in that: Two O-rings (52) are stacked and arranged; the clamping mechanism (5) further comprises a deformation guide washer (54) located between the two O-rings (52); the upper and lower ends of the deformation guide washer (54) are both provided with sloped guide recesses sinking toward the center.

5. The airtightness detection device for a ceramic flange welding assembly according to claim 2, 3 or 4, characterized in that: The invention also includes a support (3); the support (3) is provided with a channel running through the upper and lower parts; the top of the support (3) is detachably fixed to the bottom of the base (1); the bottom of the support (3) is detachably fixed to the linear actuator (51), thereby sealing both ends of the channel to form the sealed cavity (31).

6. The airtightness detection device for ceramic flange welding assembly according to claim 5, characterized in that: The invention also includes a copper tube protective sleeve (6); the copper tube protective sleeve (6) is fixedly plugged into a through hole (13) provided at the bottom of the base (1); the top of the copper tube protective sleeve (6) is located in the leak detection cavity (11), and the bottom of the copper tube protective sleeve (6) is located between the base (1) and the support (3); and the capillary tube (42) passes through the copper tube protective sleeve (6) and extends into the sealed cavity (31).

7. An airtightness detection device for a ceramic flange welding assembly according to claim 1, 2, 3 or 4, characterized in that: The base (1) is also provided with a plurality of mounting holes (12) distributed in a circumferential array; the base (1) is fixed on the carrier through the mounting holes (12).

8. An airtightness detection device for a ceramic flange welding assembly according to claim 1, 2, 3 or 4, characterized in that: It also includes a mechanical arm (7) for fixing the sealing member (2) and driving the sealing member (2) to fit into or away from the base (1).

9. An airtightness detection device for a ceramic flange welding assembly according to claim 1, 2, 3 or 4, characterized in that: A cuttable ring (44) is welded to the top of the flange (41); the diameter of the flange (41) is smaller than the diameter of the opening (10), and the diameter of the cuttable ring (44) is larger than the diameter of the opening (10); the flange (41) is placed on the opening (10) through the cuttable ring (44), and the sealing member (2) is pressed onto the edge of the cuttable ring (44).

10. An airtightness detection device for a ceramic flange welding assembly according to claim 2, 3 or 4, characterized in that: The linear actuator (51) is a pneumatic cylinder, a hydraulic cylinder or a linear motor.

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