Leak-proof sealing structure of thin-wall multi-stage pipe connector

Abstract

The utility model discloses a leakproof sealing structure of a thin-wall multi-stage pipe interface, which comprises a connecting sleeve with a step structure, one end of the connecting sleeve is connected with the inner wall of a multi-stage pipe through a rolling process, the other end of the connecting sleeve is connected with a next-stage pipe interface of the multi-stage pipe through a sealing bush, and the sealing bush is sleeved on the periphery of the end part of the connecting sleeve. The peripheral structure of the sealing bush is an annular barb array structure; sealing grooves are formed in the periphery of the end, deviating from the sealing bush, of the connecting sleeve and the position, located on one side of the sealing bush, of the periphery of the connecting sleeve in the circumferential direction, and a sealing ring is installed in each sealing groove. The leakproof sealing structure of the thin-wall multi-stage pipe connector has double sealing guarantee, the connecting sleeve and the inner wall of the multi-stage pipe are fixed through the rolling technology, pipe body deformation caused by welding / threads is avoided, and expansion of pipelines of any stage is supported.

Description

TECHNICAL FIELD

[0001] The utility model belongs to thin -walled gas pipeline sealing technical field, concretely relates to thin -walled multistage pipe joint's anti -leakage sealing structure. BACKGROUND

[0002] In many industrial applications, such as petroleum, chemical industry, natural gas and other fields, thin-walled multistage pipe is often used to transport various fluid media. If the interface is not sealed well, the medium may leak from the interface, not only causing resource waste, but also possibly causing serious safety accidents such as fire, explosion, poisoning, etc., threatening personnel life and environment. For some systems that need to transport medium under certain pressure, such as hydraulic system, pneumatic system, etc., good interface sealing is the key to maintaining system pressure stability. Inadequate sealing can cause pressure leakage, making the system unable to work normally, affecting the performance and efficiency of the equipment. Therefore, thin-walled multistage pipe interface sealing is of great significance.

[0003] The existing thin-walled multistage pipe (wall thickness ≤0.5mm) such as telescopic pipe, sleeve pipe sealing scheme is roughly divided into two kinds, one scheme is that the outer wall of the mouth of each stage pipe is processed with a sealing groove, and the sealing ring directly contacts the next stage pipe to achieve sealing effect, this scheme is easy to wear and fail under dynamic pulling working condition, in addition, processing sealing groove on thin-walled pipe will cause the strength of sealing groove to be reduced, under the action of impact force, it is easy to cause multistage pipe to break;

[0004] Another scheme is to use threaded connection to increase a connecting piece at the mouth of the multistage pipe, and process a sealing groove on the connecting piece to achieve sealing effect, this scheme avoids processing sealing groove directly on the pipe wall, but similarly, since it needs to be connected with the connecting piece by threads, the inner wall of the pipe is processed with threads, and stress concentration will occur at the threaded connection under stress, which is easy to cause the pipe wall to break. SUMMARY

[0005] The utility model aims at providing thin-walled multistage pipe joint's anti -leakage sealing structure, solve the problem of thin-walled multistage pipe on the existing technology processing sealing groove easy to cause multistage pipe deformation breakage, sealing ring easy to wear and fail.

[0006] The technical scheme of the utility model is thin-walled multistage pipe joint's anti -leakage sealing structure, including the connecting sleeve of ladder structure, the connecting sleeve one end is connected with multistage pipe inner wall through the rolling process, and the other end of connecting sleeve is connected with the next stage pipe joint of multistage pipe through sealing bush, and the sealing bush is sleeved on the outer periphery of the end of connecting sleeve, and the outer periphery structure of sealing bush is annular barb array structure;

[0007] The outer periphery of the end of connecting sleeve away from sealing bush, the outer periphery position of the middle ladder section of connecting sleeve are all provided with sealing grooves in the circumferential direction, and sealing rings are installed in each sealing groove.

[0008] The utility model discloses further characterized by,

[0009] The sealing bush and the connecting sleeve are in interference fit, and the interference amount is 0.05-0.1 mm.

[0010] The connecting sleeve and the sealing bush are glued and bonded.

[0011] The outer diameter D1 of the sealing bush in the free state of the annular barb array is equal to the inner diameter D2 of the next-stage pipe multiplied by (1.02-1.05).

[0012] The barbs on the outer periphery of the sealing bush face away from the side of the sealing ring.

[0013] The inclination angle of the barbs is 45°±10°.

[0014] The sealing bush is made of polytetrafluoroethylene.

[0015] The size of the stepped shaft outer diameter of the end of the connecting sleeve, which faces away from the sealing bush, matches the inner wall inner diameter of the multi-stage pipe connected thereto, and the outer diameter of the next-stage stepped shaft of the connecting sleeve matches the inner wall outer diameter of the multi-stage pipe connected thereto.

[0016] The utility model has the advantages of:

[0017] The anti-leakage sealing structure of the thin-wall multi-stage pipe interface has double sealing protection, the sealing rings a and b provide static sealing, and the sealing bush forms dynamic pressure sealing.

[0018] The end of the connecting sleeve is fixed to the inner wall of the multi-stage pipe through a rolling process, so that pipe body deformation caused by welding / screwing is avoided.

[0019] Self-compensating wear: the polytetrafluoroethylene barbs have elastic memory characteristics, and still maintain sealing pressure after long-term use.

[0020] The connecting structure is simple, easy to assemble, supports arbitrary number of pipeline expansion, and realizes infinite cascade. BRIEF DESCRIPTION OF DRAWINGS

[0021] Figure 1 It is the structure diagram of the anti-leakage sealing structure of the thin-wall multi-stage pipe interface of the utility model;

[0022] Figure 2 It is the sectional view of the sealing bush in the anti-leakage sealing structure of the utility model;

[0023] Figure 3 It is the axial side view of the sealing bush in the anti-leakage sealing structure of the utility model;

[0024] Figure 4 It is the use diagram of the anti-leakage sealing structure of the utility model.

[0025] In the diagram, 1. connecting sleeve, 2. sealing ring b, 3. sealing ring a, 4. sealing bushing. Detailed Implementation

[0026] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present application, and not all embodiments. Based on the embodiments of the present application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present application.

[0027] Example 1:

[0028] The present invention provides a leak-proof sealing structure for thin-walled multi-stage pipe interfaces, such as... Figure 1 As shown, the connecting sleeve 1 includes a stepped structure. The left end of the connecting sleeve 1 is connected to the inner wall of the multi-stage pipe through a rolling process. The rolling connection avoids pipe deformation caused by welding / threading. The outer diameter of the stepped shaft at the left end of the connecting sleeve 1 matches the inner diameter of the inner wall of the multi-stage pipe it is connected to. The outer diameter of the next stepped shaft of the connecting sleeve 1 matches the outer diameter of the inner wall of the multi-stage pipe it is connected to.

[0029] The right end of the connecting sleeve 1 is connected to the next stage pipe interface of the multi-stage pipe through the sealing bushing 4. The sealing bushing 4 is sleeved on the outer periphery of the end of the connecting sleeve 1, and the outer diameter of the right end of the connecting sleeve 1 matches the inner diameter of the sealing bushing 4.

[0030] like Figure 2 and Figure 3 As shown, the outer periphery of the sealing bushing 4 is a ring-shaped barb array structure; the one-way locking characteristic of the barbs can prevent high-pressure gas backflow from causing the tube body to separate, thus providing a dynamic seal.

[0031] like Figure 1 As shown, sealing grooves are provided circumferentially at the outer periphery of the left end of the connecting sleeve 1 and at the outer periphery of the middle stepped section of the connecting sleeve 1. Each sealing groove is equipped with a sealing ring to provide static sealing, which works in conjunction with the sealing bushing 4 to form a double sealing guarantee.

[0032] Example 2

[0033] Based on Example 1, the sealing bushing 4 and the connecting sleeve 1 are interference-fitted with an interference amount of 0.05~0.1mm.

[0034] Example 3

[0035] Based on Example 2, during assembly, adhesive can be applied between the connecting sleeve 1 and the sealing bushing 4 to strengthen their bonding. Since the sealing bushing 4 is subjected to force in the direction of the connecting sleeve 1 during the pulling operation, there is no need to worry about it falling off during operation.

[0036] Embodiment 4

[0037] On the basis of embodiment 3, the outer diameter D1 of the sealing bush 4 in a free state is equal to the inner diameter D2 of the next stage pipe multiplied by (1.02-1.05). That is, the maximum outer diameter of the sealing bush 4 in a free state is slightly larger than the inner wall of the multi-stage pipe to be sealed, and is tightly attached to the inner wall of the next stage pipe of the multi-stage pipe.

[0038] Embodiment 5

[0039] On the basis of embodiment 4, as shown in Figure 1 and Figure 2 , the barbs on the outer periphery of the sealing bush 4 are directed away from the sealing ring, and the barb inclination angle is 45°±10°. When the multi-stage pipe is subjected to high-pressure gas, the multi-stage pipe is gradually pulled outward, and the barbs of the sealing bush 4 are affected by the gas pressure, the gas pressure pushes the barbs to expand radially and tightly attach to the inner wall of each stage pipe to form a one-way seal, realizing that the sealing pressure is positively correlated with the gas pressure.

[0040] The sealing bush 4 is made of polytetrafluoroethylene. The material is polytetrafluoroethylene, which has a smooth surface and small friction when in contact with the inner wall of the multi-stage pipe. The polytetrafluoroethylene barb has elastic memory characteristics and can compensate for wear, and still maintains the sealing pressure after long-term use.

[0041] Embodiment 6

[0042] The anti-leakage sealing structure suitable for the thin-walled multi-stage pipe (wall thickness <0.5mm) interface of the utility model, as shown in Figure 1 , comprises a connecting sleeve 1, and the connecting sleeve 1 adopts a three-stage stepped sleeve structure. The outer diameter of the first stage stepped shaft at the left end is matched with the inner diameter of the multi-stage pipe connected thereto, and is connected through a rolling process. The rolling connection avoids deformation of the pipe body caused by welding / screwing. The outer diameter of the second stage stepped shaft in the middle is equal to the outer diameter of the multi-stage pipe connected thereto, and the outer diameter of the third stage stepped shaft at the right end is matched with the inner diameter of the sealing bush 4, and the sealing bush 4 is connected with the next stage pipe interface of the multi-stage pipe.

[0043] The sealing bush 4 is sleeved on the outer periphery of the end portion of the connecting sleeve 1, as shown in Figure 2 and Figure 3 , the cross-sectional outer periphery structure of the sealing bush 4 is an annular barb array structure, and the one-way locking characteristic of the barb can prevent the pipe body from being separated due to the backflow of high-pressure gas.

[0044] As shown in Figure 1As shown, two first sealing grooves are circumferentially arranged on the outer periphery of the first stepped shaft end of the left end of the connecting sleeve 1, and a sealing ring b2 is arranged in the first sealing groove. Two second sealing grooves are circumferentially arranged on the outer periphery of the second stepped shaft of the middle of the connecting sleeve 1, and a sealing ring a3 is arranged in the second sealing groove. In the prior art, the sealing grooves are machined on the thin-walled pipe, which reduces the strength of the sealing groove and easily causes the multi-stage pipe to break under the impact force. In the present application, the sealing grooves are machined on the connecting sleeve 1, and the multi-stage pipe is fixed by rolling and pressing process, thereby avoiding the breakage of the multi-stage pipe.

[0045] Double sealing guarantee: the sealing ring a3 and the sealing ring b2 provide static sealing, and the sealing bush 4 forms dynamic pressure sealing; the double sealing plays a double insurance role, and even if one of the sealing rings is slightly worn, the sealing effect can be achieved under the double sealing of the sealing bush 4 and the sealing ring a3 during the pulling action; in addition, the sealing ring b2 functions to seal the connecting sleeve 1 and the multi-stage pipe, and the two are fixed during the pulling movement, and there is no wear problem. The sealing grooves are machined on the outer wall of the mouth of each pipe in the prior art, and the sealing ring directly contacts the next stage pipe to achieve the sealing effect, and the sealing ring is easily worn and fails under dynamic pulling conditions.

[0046] The sealing bush 4 is in interference fit with the connecting sleeve 1, and the interference amount is 0.08 mm.

[0047] The outer diameter D1 of the sealing bush 4 in the free state of the annular barb array is equal to 1.03 times the inner diameter D2 of the next stage pipe.

[0048] The sealing bush 4 is a polytetrafluoroethylene sealing sleeve, and the barbs on the outer periphery of the sealing bush 4 are directed away from the sealing ring, and the inclination angle of the barbs is 45°.

[0049] Example 7

[0050] The difference from Example 6 is that:

[0051] The sealing bush 4 is in interference fit with the connecting sleeve 1, and the interference amount is 0.1 mm.

[0052] The outer diameter D1 of the sealing bush 4 in the free state of the annular barb array is equal to 1.02 times the inner diameter D2 of the next stage pipe.

[0053] The sealing bush 4 is a polytetrafluoroethylene sealing sleeve, and the barbs on the outer periphery of the sealing bush 4 are directed away from the sealing ring, and the inclination angle of the barbs is 55°.

[0054] Example 8

[0055] The difference from Example 6 is that:

[0056] The sealing bush 4 is in interference fit with the connecting sleeve 1, and the interference amount is 0.05 mm.

[0057] In the free state, the outer diameter D1 of the sealing bushing 4 of the annular barbed array is equal to the inner diameter D2 of the next stage pipe × 1.05.

[0058] The sealing bushing 4 is made of polytetrafluoroethylene. The barbs on the outer periphery of the sealing bushing 4 face away from the sealing ring, and the barb inclination angle is 35°.

[0059] The assembly process of the leak-proof sealing structure for the thin-walled multi-stage pipe interface of this utility model is as follows:

[0060] 1) Insert the sealing ring b2 into the double sealing groove of the first stepped shaft on the left end of the connecting sleeve 1;

[0061] 2) The left end of the connecting sleeve 1 is pressed and fixed to the end of the multi-stage pipe using a rolling process;

[0062] 3) Press the sealing bushing 4 into the end of the connecting sleeve 1 with an interference fit of 0.05~0.1mm, and install the sealing ring a3 into the sealing groove on the outer circumference of the corresponding middle second stepped shaft;

[0063] 4) Insert the assembly into the next stage pipe to the predetermined position.

[0064] The principle of the leak-proof sealing structure for thin-walled multi-stage pipe interfaces of this utility model is as follows:

[0065] like Figure 4 As shown, to simulate the working process of a four-stage multi-stage pipe, when the multi-stage pipe is subjected to high-pressure gas, the multi-stage pipe is pulled outward step by step. The barbs of the sealing bushing 4 are affected by the air pressure. The air pressure pushes the barbs to expand radially and tightly adhere to the inner wall of each stage pipe to form a one-way seal, so that the sealing pressure is positively correlated with the air pressure.

[0066] Sealing rings a3 and b2 provide static sealing, while sealing bushing 4 forms dynamic pressure sealing, providing double sealing protection.

[0067] The connection structure is simple and reliable, the parts supervision and assembly industry is simple, it supports any number of pipeline expansion levels, and can achieve unlimited cascading.

[0068] Since the pulling motion of the multistage tube is powered by air pressure, it is equivalent to the gas continuously filling the tube during the pulling process. Therefore, the barbs will always be tightly attached to the inner wall of the multistage tube. In addition, the outer diameter of the barb-type sealing bushing is larger than the inner wall of the multistage tube. The barbs are also tightly attached to the inner wall in the free state. When inflated, the barbs and the inner wall of the multistage tube fit even more tightly.

[0069] The leak-proof sealing structure for thin-walled multi-stage pipe interfaces of this utility model has the following advantages:

[0070] By combining the standardization connection sleeve with the polytetrafluoroethylene bushing with the annular barb array structure, combining the rolling lossless connection process, the infinite cascade expansion of the lossless assembly of the multi-stage pipeline system is realized, the dynamic leakage problem of the super-thin wall (<=0.5mm) multi-stage nested pipeline is solved, and the problems of the existing technology that the sealing groove on the thin-wall multi-stage pipeline is easy to be deformed and broken, and the sealing ring is easy to be worn and failed are solved.

[0071] Finally, it should be noted that in this application, the relationship terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between the entities or operations. Moreover, the terms "include", "contain" or any other variants thereof are intended to cover non-exclusive inclusion, so that the process, method, article or equipment including a series of elements not only includes those elements, but also includes other elements not explicitly listed or inherent to such process, method, article or equipment. Without more limitations, the element defined by the statement "including a" does not exclude the presence of other identical elements in the process, method, article or equipment including the element.

Claims

1. Leak-proof sealing structure of thin-walled multi-stage pipe joint, characterized by, The connecting sleeve (1) comprising a stepped structure is connected with the inner wall of the multistage pipe at one end through a rolling process, and is connected with the lower stage pipe interface of the multistage pipe at the other end through a sealing bushing (4), the sealing bushing (4) is sleeved on the outer periphery of the end of the connecting sleeve (1), and the outer periphery structure of the sealing bushing (4) is an annular array structure of barbs; The outer periphery of the end of the connecting sleeve (1) away from the sealing bushing (4) and the outer periphery of the middle stepped section of the connecting sleeve (1) are both provided with sealing grooves in the circumferential direction, and sealing rings are installed in the sealing grooves.

2. The thin-walled multistage tube interface leak-proof sealing structure according to claim 1, characterized in that, The sealing bushing (4) is in interference fit with the connecting sleeve (1), and the interference amount is 0.05-0.1 mm.

3. The thin-walled multistage tube interface leak-proof seal structure of claim 1, wherein, The connecting sleeve (1) and the sealing bushing (4) are glued and bonded.

4. The thin-walled multistage tube interface leak-proof seal structure of claim 1, wherein, The outer diameter D1 of the sealing bushing (4) in the free state of the annular array of barbs is equal to the inner diameter D2 of the lower stage pipe multiplied by (1.02-1.05).

5. The thin-walled multistage tube interface leak-proof seal structure of claim 1, wherein, The barbs of the outer periphery of the sealing bushing (4) are directed away from the side of the sealing ring.

6. The thin-walled multistage tube interface leak-proof seal structure of claim 1, wherein, The inclination angle of the barbs is 45°±10°.

7. The thin-walled multistage tube interface leak-proof seal structure of claim 1, wherein, The sealing bushing (4) is made of polytetrafluoroethylene.

8. The thin-walled multistage tube interface leak-proof seal structure of claim 1, wherein, The stepped shaft outer diameter of the end of the connecting sleeve (1) away from the sealing bushing (4) is matched with the inner diameter of the inner wall of the multistage pipe connected thereto, and the outer diameter of the lower stage stepped shaft of the connecting sleeve (1) is matched with the inner diameter of the inner wall of the multistage pipe connected thereto.

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