Quick-release seal structure

Abstract

The utility model discloses a quick detachable sealing structure, including sealing bolt, sealing ring and sealing groove, sealing bolt has head and screw rod part, and screw rod part is suitable for screw hole, and sealing ring is sleeved on the screw rod part of sealing bolt. The quick detachable sealing structure is through the sealing bolt is spun into screw hole, and the head lower end surface will extrude sealing ring, makes it fill the gap between lower end surface and sealing groove and microcosmic uneven place fully, forms the dead angle -free sealed interface, and sealing ring is sleeved on the outer periphery of screw rod part, can form the auxiliary seal with screw hole entrance hole wall simultaneously, double -guarantee blocks the helium gas leakage path, avoids the sealing failure problem caused by traditional sealant partial check crack, quick plug connector sealing ring misplacement, utilizes the static seal of sealing ring under the pressure deformation of end face, and the sealing effect is excellent, only needs to tighten or loosen sealing bolt and can realize the sealing or disassembly, and the disassembly process does not need the violent operation, and the tool body thread or sealing element itself will not be damaged.

Description

Technical Field

[0001] This utility model relates to the field of new energy battery manufacturing technology, and in particular to a quick-release sealing structure. Background Technology

[0002] In the manufacturing process of new energy batteries, the sealing performance of the battery cover is one of the key indicators to ensure the safety and reliability of the battery. Helium mass spectrometry leak detection is a widely used high-precision leak detection method. Its tooling usually needs to be connected to the through holes (or the combined vent holes) on the positive and negative electrode areas and explosion-proof valve areas on the cover, and the detection gas is injected through the inlet of the helium detector. In order to ensure that the helium gas can only flow within the preset detection path, the through holes need to be sealed.

[0003] Currently, traditional sealing structures mainly include straight thread plugs with thread sealant or liquid gaskets and metal quick-connect couplings. While the first method is simple in structure and provides a good initial seal, the sealant hardens into a rigid bond, making disassembly extremely difficult. It often requires impact or localized heating to loosen, easily damaging the threads. Each reassembly requires thorough cleaning of residual sealant and reapplication, making maintenance cumbersome, time-consuming, and severely impacting production efficiency. The second quick-connect coupling structure, while offering the advantage of rapid insertion and removal, is expensive and, due to its non-standard structure and large size, difficult to arrange rationally in space-constrained compact helium testing fixtures, resulting in poor versatility and economy.

[0004] Therefore, existing technologies lack a sealing joint structure that can ensure long-term reliable sealing while supporting rapid, non-destructive, and repeated assembly and disassembly, making it difficult to meet the dual requirements of efficient operation and stable sealing for helium testing fixtures for new energy battery covers. Utility Model Content

[0005] This invention provides a quick-release sealing structure, which can solve the problem that conventional sealing structures mentioned in the background art cannot meet the dual requirements of efficient operation and stable sealing for helium testing tooling for new energy battery cover plates.

[0006] A quick-release sealing structure is used for sealing a helium testing fixture for a new energy battery cover. The helium testing fixture includes a fixture body and a threaded through hole formed on the fixture body. The fixture body also has a sealing groove surrounding the threaded through hole, and one end of the threaded through hole communicates with the bottom of the sealing groove. The quick-release sealing structure includes:

[0007] A sealing bolt having a head and a threaded portion, the threaded portion being adapted to the threaded through hole;

[0008] A sealing ring is fitted onto the threaded portion of the sealing bolt and is located on the side of the head facing the threaded portion, and the sealing ring is pressed into the sealing groove by the threaded portion.

[0009] Preferably, the side of the head facing the screw is arranged parallel to the bottom surface of the sealing groove.

[0010] Preferably, the sealing bolt is a T-head bolt.

[0011] Preferably, the diameter of the head is larger than the diameter of the screw portion.

[0012] Preferably, the sealing ring is an O-ring.

[0013] Preferably, the cross-sectional diameter of the sealing ring is adapted to the depth of the groove.

[0014] Preferably, an outer sealing ring is provided between the sealing ring and the head, and the outer sealing ring is sleeved on the screw portion.

[0015] Preferably, the outer sealing ring diameter is larger than the sealing ring diameter.

[0016] Preferably, the sealing ring is made of an elastic material that is resistant to helium permeation.

[0017] Preferably, the helium-resistant elastic material is fluororubber or hydrogenated nitrile rubber.

[0018] The beneficial effects of this utility model are:

[0019] This quick-release sealing structure, by screwing the sealing bolt into the threaded through hole, compresses the sealing ring on the lower end face of the head, fully filling the gap and micro-unevenness between the lower end face and the sealing groove, forming a sealing interface without dead angles. The sealing ring, fitted around the outer circumference of the screw, simultaneously forms an auxiliary seal with the inlet wall of the threaded through hole, providing double protection to block helium leakage paths. This avoids the sealing failure problems caused by localized cracking of traditional sealant and misalignment of the quick-connect fitting's sealing ring. Static sealing is achieved by the deformation of the sealing ring under pressure on the end face, resulting in excellent sealing performance. It completely eliminates the need for sealant; sealing or disassembly can be achieved simply by tightening or loosening the sealing bolt. Operation is simple and quick, and disassembly requires no force and will not damage the tooling thread or the sealing component itself. It meets the dual requirements of efficient operation and stable sealing for helium testing tooling for new energy battery covers. Attached Figure Description

[0020] Figure 1 A schematic diagram of the quick-release sealing structure provided by this utility model;

[0021] Figure 2 An installation diagram of the quick-release sealing structure provided by this utility model;

[0022] Figure 3 A side view of the quick-release sealing structure provided by this utility model;

[0023] Figure 4 A bottom view of the quick-release sealing structure provided by this utility model;

[0024] Figure 5 A schematic diagram of a quick-release sealing structure according to another embodiment of the present invention;

[0025] Figure 6 This is an installation diagram of a quick-release sealing structure according to another embodiment of the present invention.

[0026] Explanation of reference numerals in the attached figures:

[0027] 1. Sealing bolt; 2. Sealing ring; 3. Helium detection fixture; 4. Outer sealing ring; 11. Head; 12. Screw section; 31. Fixture body; 32. Threaded through hole; 33. Sealing groove. Detailed Implementation

[0028] The specific embodiments of this utility model are described in detail below, but it should be understood that the scope of protection of this utility model is not limited to the specific embodiments.

[0029] Example 1:

[0030] like Figure 1-4 As shown, this utility model proposes a quick-release sealing structure for sealing a helium inspection fixture 3 for a new energy battery cover. The helium inspection fixture 3 includes a fixture body 31 and a threaded through hole 32 opened on the fixture body 31. The fixture body 31 is also provided with a sealing groove 33 surrounding the threaded through hole 32, and one end of the threaded through hole 32 is connected to the bottom of the sealing groove 33. The quick-release sealing structure includes a sealing bolt 1, a sealing ring 2 and a sealing groove 33. The sealing bolt 1 has a head 11 and a screw portion 12, and the screw portion 12 is adapted to the threaded through hole 32. The sealing ring 2 is sleeved on the screw portion 12 of the sealing bolt 1 and is located on the side of the head 11 facing the screw portion 12, and the sealing ring 2 is pressed into the sealing groove 33 by the screw portion 12.

[0031] In the technical solution of this utility model, by screwing the sealing bolt 1 into the threaded through hole 32, the lower end face of the head 11 will squeeze the sealing ring 2, so that it fully fills the gap and micro-unevenness between the lower end face and the sealing groove 33, forming a sealing interface without dead angles. The sealing ring 2 is sleeved on the outer circumference of the screw part 12, and can simultaneously form an auxiliary seal with the inlet hole wall of the threaded through hole 32, providing double protection to block the helium leakage path, avoiding the sealing failure problems caused by local cracking of traditional sealant and misalignment of quick-connect joint sealing rings. Static sealing is achieved by the deformation of the sealing ring 2 under pressure on the end face, with excellent sealing effect. It completely eliminates the need for sealant. Sealing or disassembly can be achieved by simply tightening or loosening the sealing bolt 1. The operation is simple and quick. The disassembly process does not require violent operation and will not damage the tooling body threads or the sealing element itself. It can meet the dual requirements of efficient operation and stable sealing of the helium detection tooling for new energy battery cover.

[0032] Specifically, there is no violent operation during disassembly. The screw part 12 of the sealing bolt 1 and the threaded through hole 32 are purely mechanically matched, which will not cause the thread of the tool body 31 to strip or deform. This avoids the loss of tool thread repair or overall replacement in traditional solutions. There is no adhesive residue on the head 11 and screw part 12 of the sealing bolt 1, which can be screwed in and used repeatedly. The sealing ring 2 achieves sealing only through elastic deformation, without physical damage.

[0033] When the sealing bolt 1 is screwed into the threaded through hole 32, the lower end face of the head 11 presses against the sealing ring 2, causing it to undergo elastic deformation and fill the space between the lower end face and the sealing groove 33, forming a static seal on the end face.

[0034] like Figure 1 and Figure 2 As shown, the sealing bolt 1 is a T-head bolt, with the diameter of the head 11 being larger than the diameter of the screw 12. The flat head structure of the T-head forms a natural force-applying handle, allowing the operator to quickly grip the head with their hand or a regular wrench, enabling the bolt to be screwed in and out without special tools, thus improving assembly and disassembly efficiency. The difference in diameter between the head 11 and the screw 12 creates a stepped structure that is wider at the top and narrower at the bottom. When the sealing ring 2 is fitted onto the screw 12, the lower end face of the head 11 can directly support the sealing ring 2. During assembly, there is no need to manually fix the sealing ring; simply aligning the bolt with the threaded through hole 32 is sufficient to simultaneously position the sealing ring, reducing operational errors and making it particularly suitable for single-person rapid assembly needs.

[0035] The head end face of the sealing bolt 1 is set parallel to the sealing surface in the sealing groove 33 to ensure that the sealing ring 2 can uniformly fill the gap after being deformed by pressure.

[0036] like Figure 1 and Figure 2As shown, the sealing ring 2 is an O-ring. The annular cross-section of the O-ring has a uniform elastic deformation capability. When the lower end face of the head 11 of the T-head bolt is pressed, it can undergo elastic deformation synchronously in the radial and axial directions. It can adaptively fill the gap, micro-scratches, or uneven areas between the lower end face of the head and the sealing groove 33. Compared with rectangular or square cross-section sealing rings, the deformation coverage of the O-ring structure is wider, which can form a sealing interface without dead angles and eliminate the risk of helium leakage from local gaps. The annular structure of the O-ring does not need to be precisely aligned. It only needs to be fitted onto the threaded part 12 of the sealing bolt 1 to complete the initial positioning. Moreover, its inner diameter can achieve an interference fit with the outer diameter of the threaded part 12, and it is not easy to deviate or misalign during assembly.

[0037] The sealing ring 2 is made of a helium-resistant elastic material, which is either fluororubber or hydrogenated nitrile rubber. Both fluororubber and hydrogenated nitrile rubber have excellent elastic modulus and resistance to compression set. Under long-term compression of the T-head bolt, the sealing ring can still maintain good elasticity after being deformed by pressure. It can quickly return to its original shape after the bolt is loosened and will not lose its elasticity due to long-term compression. Neither fluororubber nor hydrogenated nitrile rubber reacts chemically with metals. No sealant needs to be applied during assembly. When disassembling, the sealing ring will not stick to the lower end face of the head or the sealing groove 33 and can be directly removed along with the bolt, avoiding the tedious process of cleaning residual sealant and further shortening the assembly and disassembly time.

[0038] Specifically, the cross-sectional diameter of the sealing ring 2 is adapted to the depth of the groove 33. By adapting the cross-sectional diameter of the sealing ring to the depth of the groove, it is ensured that after the bolt is tightened, the sealing ring 2 can be squeezed to fill the groove space. It will not be too shallow, resulting in insufficient deformation, nor too deep, resulting in excessive compression. This achieves precise control of the sealing pressure. The structure of the groove 33 can provide radial positioning for the sealing ring 2, preventing the sealing ring from shifting out of the sealing groove 33 due to force during assembly or bolt tightening.

[0039] Example 2:

[0040] like Figure 5 and Figure 6 As shown, an outer sealing ring 4 is provided between the sealing ring 2 and the head 11. The outer sealing ring 4 is sleeved on the screw part 12, and the diameter of the outer sealing ring 4 is larger than the diameter of the sealing ring 2.

[0041] Specifically, the outer sealing ring 4 has a larger diameter than the sealing ring 2, allowing it to cover a wider area of ​​the tooling body 31 (beyond the annular sealing surface and the groove 33). When the head 11 of the T-head bolt is pressed down, the outer sealing ring 4 and the surface of the tooling body form an outer static seal. This seal can prevent dust, oil, water vapor and other impurities in the production environment from entering the inner sealing ring 2 and the annular sealing surface area, avoiding the adhesion of impurities that could cause the sealing surface of the sealing ring 2 to not fit tightly, or contaminate the helium detection path inside the threaded through hole 32. At the same time, if there is local minor damage to the sealing ring 2, the outer sealing ring 4 can act as a second sealing barrier to slow down the rate of helium leakage, providing a buffer for the accurate detection of the helium detection equipment and reducing the risk of misjudgment due to the failure of a single seal.

[0042] The outer sealing ring 4 and the sealing ring 2 are arranged in a stepped manner on the screw part 12. When the head 11 is pressed, the pressure will be initially dispersed through the outer sealing ring 4 and then transmitted to the sealing ring 2. The presence of the outer sealing ring 4 can avoid local pressure concentration caused by slight tilting of the lower end face of the head, making the sealing ring 2 more uniformly stressed, and further ensuring that its elastic deformation can fully fill the gap between the annular sealing surface and the lower end face of the head, thus strengthening the stability of the static seal of the core end face.

[0043] The outer sealing ring 4 has a larger diameter and will contact the head 11 and tool body surface before the sealing ring 2 during assembly. This can prevent the lower end face of the head 11 from directly scraping the surface of the sealing ring 2 when the operator installs the bolts. At the same time, the outer sealing ring 4 can prevent the tool from accidentally touching the sealing ring 2 when turning the head 11, reducing the risk of tearing and chipping of the sealing ring due to physical scraping and extending its service life.

[0044] Working principle: A sealing groove 33 is made around the threaded through hole 32 at the inlet of the helium detection fixture body 31 of the new energy battery cover. An O-ring 2 with a cross-sectional diameter and groove depth is placed in the sealing groove 33 and fitted onto the screw part 12 of the T-head bolt. When the T-head bolt is screwed into the threaded through hole 32, the lower end face of its head 11 presses down on the O-ring 2 with the tightening action. The side wall of the sealing groove 33 restricts the excessive radial expansion of the sealing ring, so that the sealing ring only produces directional elastic deformation between the lower end face of the head and the sealing groove 33, filling the gap and micro-unevenness between the two. At the same time, the inner circumference of the sealing ring 2 fits against the screw part 12, and the outer circumference assists in sealing with the side wall of the sealing groove 33, finally forming a reliable static seal on the end face. This ensures that the helium gas flows only along the preset detection path, and disassembly can be achieved by simply loosening the bolt without any destructive operation.

[0045] The above-disclosed embodiments are only a few specific examples of the present utility model. However, the embodiments of the present utility model are not limited thereto. Any changes that can be conceived by those skilled in the art should fall within the protection scope of the present utility model.

Claims

1. A quick-release sealing structure for sealing a helium inspection fixture (3) for a new energy battery cover, the helium inspection fixture (3) comprising a fixture body (31) and a threaded through hole (32) formed on the fixture body (31), characterized in that, The tooling body (31) is also provided with a sealing groove (33) surrounding the threaded through hole (32), and one end of the threaded through hole (32) is connected to the bottom of the sealing groove (33). The quick-release sealing structure includes: A sealing bolt (1) having a head (11) and a threaded portion (12) adapted to the threaded through hole (32); The sealing ring (2) is fitted onto the screw portion (12) of the sealing bolt (1) and is located on the side of the head (11) facing the screw portion (12), and the sealing ring (2) is pressed into the sealing groove (33) by the screw portion (12).

2. The quick-release sealing structure as described in claim 1, characterized in that, The side of the head facing the screw (12) is parallel to the bottom surface of the sealing groove (33).

3. The quick-release sealing structure as described in claim 1, characterized in that, The sealing bolt (1) is a T-head bolt.

4. The quick-release sealing structure as described in claim 1, characterized in that, The diameter of the head (11) is larger than the diameter of the screw (12).

5. The quick-release sealing structure as described in claim 1, characterized in that, The sealing ring (2) is an O-ring.

6. The quick-release sealing structure as described in claim 1, characterized in that, The cross-sectional diameter of the sealing ring (2) is adapted to the depth of the sealing groove (33).

7. The quick-release sealing structure as described in claim 1, characterized in that, An outer sealing ring (4) is provided between the sealing ring (2) and the head (11), and the outer sealing ring (4) is sleeved on the screw part (12).

8. The quick-release sealing structure as described in claim 7, characterized in that, The outer sealing ring (4) has a larger diameter than the sealing ring (2).

9. The quick-release sealing structure as described in claim 1, characterized in that, The sealing ring (2) is made of an elastic material that is resistant to helium permeation.

10. The quick-release sealing structure as described in claim 9, characterized in that, The helium-resistant elastic material is fluororubber or hydrogenated nitrile rubber.

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