Inflating nozzle structure and assembly process for inflatable sealing ring

Abstract

The present invention provides an inflatable nozzle structure and assembly process for an inflatable sealing ring, which belongs to the field of sealing parts, and includes an inflatable nozzle, which is an inverted T-shape; the inflatable nozzle includes an air intake pipe and a fixing plate, the interior of the air intake pipe is provided with an air intake channel, one end of the air intake channel is connected to the outside, and the other end is connected to the interior of the inflatable sealing ring, the fixing plate is arranged at the outer ring of the lower end of the air intake pipe, the fixing plate is embedded in the thickness layer of the inflatable sealing ring, and the lower end face of the air intake pipe is arranged to overlap with the inner wall of the inflatable sealing ring; the inflatable nozzle is fixedly combined with the inflatable sealing ring as a whole. The present invention reduces the tearing force at the joint surface and protects the air tightness of the joint surface.

Description

Technical Field

[0001] The invention belongs to the field of aerospace, relates to an inflatable sealing ring, and in particular to an inflatable nozzle structure and an assembly process for the inflatable sealing ring. Background Art

[0002] The inflatable seal ring is also called an air bag. It is hollow inside and has at least one inflation (deflation) nozzle. The retractable part of the seal ring is hidden in the groove in the natural state. When the seal ring is inflated through the nozzle, the seal ring is deformed due to the internal pressure, and the middle part bulges outwards and contacts closely with the other sealing surface, thus playing a sealing role. When the sealing state needs to be released, the high-pressure gas in the seal ring is discharged through the nozzle, and the expanded part automatically retracts into the groove due to the elasticity of the rubber and separates from the sealing surface. It is mostly used to seal the gap between large doors and hatches or pipeline ports and valves that are frequently opened and closed.

[0003] Common inflatable seals include rectangular inflatable seals, which are non-metallic closed annular seals consisting of a metal inflator nozzle and a non-metallic rubber strip. The non-metallic rubber strip has a rectangular cross-section and is hollow inside. The metal inflator nozzle can be used to inflate the rubber strip. The seal expands in the rectangular sealing groove and maintains the internal pressure, which can seal the joint.

[0004] The metal inflator nozzle structure inside the existing inflatable sealing ring is in an inverted "T" shape. Figure 1 Schematic diagram of the metal inflation nozzle in the figure. The size of the metal inflation nozzle inside the rubber strip is the same as the inner size of the rubber strip, and can fit tightly. When the metal inflation nozzle inside the rubber strip is combined with the rubber strip, surface 3 is not combined with the inner surface of the rubber strip, and the other three surfaces must be combined with the rubber strip. Only in this way can the air nozzle and the rubber strip be airtight. However, there are problems with this structure: since the metal blocks at surfaces 2 and 4 are combined with the rubber surfaces here, the rubber surfaces at surfaces 2 and 4 cannot be stretched enough during inflation, and only the rubber surface at surface 3 can expand outward enough, resulting in the inflation seal ring. When the inflation seal is inflated, the sealing gap at the inflation nozzle is not as large as that at other places. This place is particularly easy to expand. Leakage. When the inflatable sealing ring is inflated for use, a weak sealing point is formed in this area, which is prone to leakage, or requires a higher inflation pressure to seal. Increasing the inflation pressure reduces the reliability of the sealing ring. A higher pressure must be inflated to make the rubber strip here stretch excessively relative to other places to meet the sealing requirements here. However, excessive inflation pressure makes the inflatable sealing ring easy to be blown up, resulting in sealing failure. Excessive pressure will also indirectly lead to a reduction in the application range of the inflatable sealing ring. Moreover, the design of combining three sides increases the combining area, which makes it difficult to apply uniform force when applying force at the combining point, and the combining quality is extremely unstable. It is particularly easy for the combining point to be unsealed and the inflatable sealing ring itself to leak. Summary of the invention

[0005] The problem to be solved by the present invention is to provide an inflation nozzle structure and an assembly process for an inflatable sealing ring, thereby reducing the tearing force at the joint surface and protecting the air tightness of the joint surface; by using the longer side of the rectangle to increase the length of the force arm, when the pre-tightening torque is constant, the force on the fixed plate structure can be reduced, thereby protecting the air tightness of the joint surface.

[0006] In order to solve the above technical problems, the technical solution adopted by the present invention is: an inflation nozzle structure and assembly process for an inflatable sealing ring, comprising an inflation nozzle, which is an inverted T-shape;

[0007] The inflation nozzle includes an air inlet pipe and a fixing plate, wherein an air inlet passage is arranged inside the air inlet pipe, one end of the air inlet passage is communicated with the outside, and the other end is communicated with the inside of the inflation seal ring, the fixing plate is arranged on the outer ring at the lower end of the air inlet pipe, the fixing plate is embedded in the thickness layer of the inflation seal ring, and the lower end surface of the air inlet pipe is arranged to overlap with the inner wall of the inflation seal ring;

[0008] The inflation nozzle is fixedly integrated with the inflation sealing ring.

[0009] Furthermore, the inflation nozzle is a metal inflation nozzle, the air inlet pipe is vertically and centrally arranged on the fixing plate, and the thickness of the fixing plate is 0.45-0.55 times the thickness of the inflation sealing ring.

[0010] Furthermore, the air inlet pipe is in the shape of a hollow cylinder, the fixing plate is in the shape of a rectangle, and transition arcs are provided at the four corners of the fixing plate so that the sealing ring is not scratched when the fixing plate contacts the sealing ring.

[0011] Furthermore, the outer diameter of the air intake pipe is equal to or slightly smaller than the width of the fixing plate.

[0012] Furthermore, it is used on an inflatable sealing ring with a rectangular cross section, the inflating nozzle is arranged on one side thereof, and the width of the fixing plate is equal to the inner diameter side length of the side where the fixing plate is located after the rectangular inflatable sealing ring is inflated.

[0013] Furthermore, a rectangular inflatable sealing ring is arranged in the sealing groove, and the sealing groove is a groove-shaped structure opening downward. A sealing plate is arranged corresponding to the lower end of the rectangular inflatable sealing ring, and a sealing gap is formed between the sealing plate and the lower end surface of the sealing groove. After the rectangular inflatable sealing ring is inflated, the sealing gap between the sealing groove and the sealing plate is filled to form a sealed state.

[0014] Furthermore, the minimum inflation pressure value of the inflatable sealing ring is 0.15Mpa.

[0015] The assembly process of the inflation nozzle for the inflatable sealing ring is applied in the assembly process of the inflation nozzle structure for the inflatable sealing ring, and can also be applied in the process of vulcanization of the butt joint of rubber strips.

[0016] The assembly process of the inflatable nozzle for the inflatable sealing ring includes the following steps:

[0017] S1. Make a straight rubber strip with a hollow interior and unsealed ends. The length can be determined according to needs.

[0018] S2. Closing of the straight rubber strip. When both ends are closed, a rigid support tool is placed at the joint interface, and an inflation nozzle is placed at the same time. The rigid support tool is made of soluble material, which is dissolved into liquid by soluble salt or solution and discharged from the air inlet channel of the inflation nozzle;

[0019] S3, fixation and vulcanization, fix the rubber strip, built-in rigid support tooling and inflation nozzle with clamping force, and vulcanize and bond the three together, and wait for them to solidify;

[0020] S4, dissolve, pour in the solution, and discharge from the air inlet channel after the rigid support tooling is dissolved into liquid.

[0021] Furthermore, the rigid support tooling is made of high-strength magnesium alloy material, the cross-section of the rigid support tooling is consistent with the inner diameter of the cross-section of the inflatable sealing ring after inflation, and a weight reduction hole is provided inside the rigid support tooling.

[0022] Compared with the prior art, the present invention has the following advantages and positive effects.

[0023] 1. When the inflation nozzle is connected to the external pipeline, the present invention generates a pre-tightening torque during the screwing operation. The internally coated sheet structure adopts a rectangular shape instead of a circular shape. The pre-tightening force is resisted by the extrusion force of the structural corners and the rubber strip, which can reduce the tearing force at the joint surface and protect the air tightness of the joint surface. The longer side of the rectangle is used to increase the length of the force arm. When the pre-tightening torque is constant, the force on the sheet structure can be reduced, which protects the air tightness of the joint surface.

[0024] 2. The metal block wrapped inside is changed into a fixed sheet structure. The sheet structure is only fixed to one of the surfaces of the rubber strip, and the other three surfaces are not combined, releasing the freedom of the three surfaces, and they can all expand freely. The fixed sheet of the sheet T-shaped structure is completely covered inside one surface of the rubber strip, so that the upper and lower surfaces of the fixed sheet can be combined with the rubber strip, which relatively increases the contact area. The entire fixed sheet structure is a plane without a three-dimensional space structure, which is easy to apply force evenly, meeting the requirements of uniform force application in the bonding process;

[0025] 3. Using the assembly process in this application, the inflation nozzle and the rubber layer are tightly and firmly attached to ensure a high product qualification rate, improved product reliability and long service life. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] The accompanying drawings constituting a part of the present invention are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the accompanying drawings:

[0027] Figure 1 Schematic diagram of the conventional structure of the inflatable nozzle for the inflatable sealing ring of the present invention;

[0028] Figure 2 It is a structural schematic diagram of the inflation nozzle of the present invention;

[0029] Figure 3 is a perspective view of an inflation nozzle of the present invention;

[0030] Figure 4 It is a structural schematic diagram of the application of the inflation nozzle of the present invention;

[0031] Figure 5 It is a cross-sectional schematic diagram of the application of the inflation nozzle of the present invention;

[0032] Figure 6 This is a diagram showing the application state of the inflatable nozzle for the inflatable sealing ring of the present invention;

[0033] Figure 7 It is a cross-sectional view of the inflatable sealing ring of the present invention without the inflatable nozzle;

[0034] Figure 8 It is a structural schematic diagram of the inflatable sealing ring of the present invention;

[0035] Fig. 9 This is a diagram of the horizontal force clamping state of the inflation nozzle for the inflatable sealing ring of the present invention during the assembly process;

[0036] Fig.10 This is a diagram of the longitudinal force clamping state of the inflation nozzle for the inflatable sealing ring of the present invention during the assembly process;

[0037] Reference numerals:

[0038] 1. Inflating nozzle; 11. Intake pipe; 12. Fixing plate; 13. Intake channel; 14. Transition arc; 2. Rubber strip; 3. Sealing groove; 5. Sealing plate; 6. Sealing gap; 7. Rigid support tooling; 71. Weight reduction hole. DETAILED DESCRIPTION

[0039] It should be noted that, without any particular exception, the embodiments of the present invention and the features therein may be combined with each other.

[0040] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying 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. Thus, features defined as "first", "second", and the like may explicitly or implicitly include one or more of the features. In the description of the present invention, unless otherwise specified, "multiple" means two or more.

[0041] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood by specific circumstances.

[0042] The specific embodiments of the present invention are described in detail below with reference to the accompanying drawings.

[0043] like Figure 1-Figure 8 As shown, the present invention is an inflation nozzle structure and assembly process for an inflation sealing ring, including an inflation nozzle 1, which is an inverted T-shape; the inflation nozzle 1 includes an air intake pipe 11 and a fixing plate 12, an air intake channel 13 is provided inside the air intake pipe 11, one end of the air intake channel 13 is connected to the outside, and the other end is connected to the inside of the inflation sealing ring, the fixing plate 12 is arranged on the outer ring of the lower end of the air intake pipe 11, the fixing plate 12 is embedded in the thickness layer of the inflation sealing ring, and the lower end surface of the air intake pipe 11 is arranged to overlap with the inner wall of the inflation sealing ring; the inflation nozzle 1 is combined and fixed with the inflation sealing ring as a whole.

[0044] Preferably, the inflation nozzle 1 is a metal inflation nozzle, and the air inlet pipe 11 is vertically and centrally arranged on the fixing plate 12. The thickness of the fixing plate 12 is 0.45-0.55 times the thickness of the inflation sealing ring. If this ratio is too large, the fixing plate is not easy to fix. If it is too small, the strength is insufficient.

[0045] Preferably, the air intake pipe 11 is a hollow cylinder, the fixing plate 12 is a rectangle, and the four corners of the fixing plate 12 are provided with transition arcs 14 so that the sealing ring is not scratched when the fixing plate 12 contacts with the sealing ring; the outer diameter of the air intake pipe 11 is equal to or slightly smaller than the width of the fixing plate 12, occupying a smaller width and having a compact structure.

[0046] Preferably, it is used on an inflatable sealing ring with a rectangular cross section, the inflating nozzle 1 is arranged on one side thereof, and the width of the fixing plate 12 is equal to the inner diameter side length of the side where the fixing plate 12 is located after the rectangular inflatable sealing ring is inflated.

[0047] Preferably, the rectangular inflatable sealing ring is arranged in the sealing groove 3, and the sealing groove 3 is a groove-shaped structure with an opening facing downward. A sealing plate 5 is arranged corresponding to the lower end of the rectangular inflatable sealing ring, and the sealing plate 5 and the lower end surface of the sealing groove 3 form a sealing gap 6. After the rectangular inflatable sealing ring is inflated, the sealing gap 6 between the sealing groove 3 and the sealing plate 5 is filled to form a sealed state.

[0048] Preferably, the minimum inflation pressure of the inflatable sealing ring is 0.15 MPa. The traditional structure requires at least 0.35 MPa to ensure sealing, while the present structure requires a smaller pressure and is not prone to leakage.

[0049] Specific working process: the inflatable sealing ring includes a metal inflating nozzle and an inflatable carrier of the rubber inflatable sealing ring. After the two are combined, the inflatable sealing ring itself can be airtight as a whole. In this application, the inflatable carrier of the inflatable sealing ring is supported by a rubber strip to form an annular inflatable space.

[0050] Put the inflatable sealing ring into the rectangular sealing groove, inflate the inside of the inflatable sealing ring and expand it, so as to block the sealing gap between the sealing ring and the sealing plate, so that the internal space becomes a sealed cavity, so that a stable pressure difference can be generated inside and outside.

[0051] After using the structure of the present application, the air tightness of the joint surface between the inflation nozzle and the rubber strip is good; after being placed in the sealing groove, at the position of the inflation nozzle, the rubber strip here expands well after inflation, and there is no need to inflate with a higher pressure like before to achieve sealing at the sealing surface. The minimum inflation pressure value that can achieve reliable airtightness of the sealing surface is reduced from 0.35MPa to 0.15MPa. The metal inflation nozzle structure solves the two problems of poor air tightness itself and poor pressure-maintaining air tightness caused by traditional inflation nozzles, and the reliability achieves a qualitative leap. No air leakage incidents have occurred at the root of the air nozzle during use.

[0052] The assembly process of the inflation nozzle 1 for an inflatable sealing ring can be applied to the assembly process of the inflation nozzle 1 structure for an inflatable sealing ring, and can also be applied to the process of vulcanization of the butt joint of the rubber strips 2 and the rubber strips 2.

[0053] like Fig. 9 and Fig.10As shown, the assembly process of the inflation nozzle 1 for the inflation seal ring includes the following steps:

[0054] S1, making a straight rubber strip 2 with a hollow interior and unsealed ends, the length of which is determined according to needs;

[0055] S2, the closing of the straight rubber strip 2. When both ends are closed, a rigid support tool is placed at the joint interface, and the inflation nozzle 1 is placed at the same time. The rigid support tool is made of soluble material, which is dissolved into liquid by soluble salt or solution and discharged from the air inlet channel 13 of the inflation nozzle 1;

[0056] S3, fixation and vulcanization, the rubber strip 2, the built-in rigid support tooling and the inflation nozzle 1 are clamped and fixed, and the three are vulcanized and bonded as a whole, and wait for them to solidify. In this step, the curing time is 24 hours.

[0057] S4, dissolving, pouring the solution, and discharging it from the air inlet channel 13 after the rigid support tooling is dissolved into liquid.

[0058] Moreover, the cross section of the rigid support tooling is consistent with the inner diameter of the cross section of the inflatable sealing ring after inflation, which is convenient for support. The interior of the rigid support tooling 7 is provided with a weight reduction hole 71 to reduce the dissolution time.

[0059] The final assembly process of the metal inflation nozzle 1 and the non-metallic rubber strip 2 is an important step to ensure the good airtightness of the inflation seal ring. The non-metallic rubber strip 2 is hollow. If the metal air nozzle and the rubber strip 2 are to be well adhered on the contact surface between the two, a rigid support tool must be placed inside the rubber strip 2 at the metal air nozzle to apply external force to clamp the metal air nozzle and the rubber strip 2. The size of the clamping force and the clamping time are important factors affecting the good adhesion between the two. If the clamping force is not enough, good adhesion cannot be obtained; if the clamping time is too short, good adhesion cannot be obtained. After the clamping time is over, the internal rigid support tooling needs to be removed from the inside to restore the flexibility of the sealing ring so that the metal inflation nozzle 1 and the non-metallic rubber strip can be firmly attached and leak-proof. The through hole of the inflation nozzle 1 is small, while the internal support tooling is large. After fixation, the rigid support tooling is dissolved, and the solution flows out from the air inlet channel 13 to achieve the purpose of removing the rigid support tooling. During the process, the rigid support tooling needs to meet the large clamping force requirements well. If the clamping force is too large, it will break and cause the product to be scrapped; if the clamping force is too small, the adhesion at the contact interface between the metal inflation nozzle 1 and the rubber strip 2 will not meet the standard, resulting in leakage at the contact surface between the two and the product being scrapped. Therefore, each adjustment of the clamping force is particularly time-consuming, and the clamping force cannot be increased to the optimal value every time, resulting in a low yield.

[0060] The rigid support fixture is made of high-strength magnesium alloy material, which is a high-strength metal, but can be turned into powder in the solution and flow out of the air inlet channel 13 with the solution. The high-strength magnesium alloy material has a strength much higher than that of solid soluble salt and far exceeds the strength value required for the optimal clamping force. It can be machined and accurately machined to a reasonable shape; after encountering the solution, it can quickly dissolve into powder and be discharged from the inflation hole with the solution. The problem of low strength of the support fixture is perfectly solved.

[0061] It is used in the process of vulcanization of the rubber strips 2 and the rubber strips 2. Different from the assembly process of the inflation nozzle 1 for the inflation sealing ring, in S1, inflation and exhaust holes are reserved. In step S2, only the rigid support tooling is used without the inflation nozzle 1. In step S4, the melted liquid is discharged from the reserved inflation and exhaust holes, which further expands the application scope of this process. These are two different applications of this tooling.

[0062] The above is a detailed description of an embodiment of the present invention, but the content is only a preferred embodiment of the present invention and cannot be considered to limit the scope of implementation of the present invention. All equivalent changes and improvements made within the scope of the present invention should still fall within the scope of the patent coverage of the present invention.

Claims

1. An inflatable nozzle structure for an inflatable sealing ring, characterized in that: Including an inflation nozzle, which is an inverted T-shape; The inflation nozzle includes an air inlet pipe and a fixing plate, wherein an air inlet passage is arranged inside the air inlet pipe, one end of the air inlet passage is communicated with the outside, and the other end is communicated with the inside of the inflation seal ring, the fixing plate is arranged on the outer ring at the lower end of the air inlet pipe, the fixing plate is embedded in the thickness layer of the inflation seal ring, and the lower end surface of the air inlet pipe is arranged to overlap with the inner wall of the inflation seal ring; The inflation nozzle and the inflation sealing ring are fixed together as a whole; The inflation nozzle is a metal inflation nozzle, and the air inlet pipe is vertically and centrally arranged on the fixing plate, and the thickness of the fixing plate is 0.45-0.55 times the thickness of the inflation sealing ring; The air inlet pipe is in the shape of a hollow cylinder, the fixing plate is in the shape of a rectangle, and transition arcs are arranged at the four corners of the fixing plate so that the fixing plate will not scratch the sealing ring when it contacts with the sealing ring; Used on an inflatable sealing ring with a rectangular cross section, the inflation nozzle is arranged on one side of the inflatable sealing ring, and the width of the fixing plate is equal to the inner diameter side length of the side where the fixing plate is located after the rectangular inflatable sealing ring is inflated.

2. The inflatable nozzle structure for an inflatable sealing ring according to claim 1, characterized in that: The outer diameter of the air intake pipe is equal to or slightly smaller than the width of the fixing plate.

3. The inflatable nozzle structure for an inflatable sealing ring according to claim 1, characterized in that: A rectangular inflatable sealing ring is arranged in the sealing groove, which is a groove-shaped structure with an opening facing downward. A sealing plate is arranged corresponding to the lower end of the rectangular inflatable sealing ring, and a sealing gap is formed between the sealing plate and the lower end surface of the sealing groove. After the rectangular inflatable sealing ring is inflated, the sealing gap between the sealing groove and the sealing plate is filled to form a sealed state.

4. The inflatable nozzle structure for an inflatable sealing ring according to claim 1, characterized in that: The minimum inflation pressure of the inflatable sealing ring is 0.15Mpa.

5. An assembly process of the inflatable nozzle structure for an inflatable sealing ring according to any one of claims 1 to 4, characterized in that: The following steps are included: S1. Make a straight rubber strip with a hollow interior and unsealed ends. The length can be determined according to needs. S2. Closing of the straight rubber strip. When both ends are closed, a rigid support tool is placed at the joint interface, and an inflation nozzle is placed at the same time. The rigid support tool is made of soluble material, which is dissolved into liquid by soluble salt or solution and discharged from the air inlet channel of the inflation nozzle; S3, fixation and vulcanization, fix the rubber strip, built-in rigid support tooling and inflation nozzle with clamping force, and vulcanize and bond the three together, and wait for them to solidify; S4, dissolve, pour in the solution, and discharge from the air inlet channel after the rigid support tooling is dissolved into liquid.

6. The assembly process of the inflatable nozzle structure for the inflatable sealing ring according to claim 5, characterized in that: The rigid support tooling is made of high-strength magnesium alloy material. The cross-section of the rigid support tooling is consistent with the inner diameter of the cross-section of the inflatable sealing ring after inflation. The rigid support tooling is provided with weight-reducing holes inside.

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