A connecting catheter system and its assembly and disassembly method

Abstract

The present invention provides a connecting catheter system and an assembly and disassembly method thereof, comprising two sleeves, two catheters and a sleeve; the two sleeves are respectively arranged at the two ends of the sleeve; the sleeve is sleeved on the outer wall of the sleeve; a first groove is axially arranged on the outer wall of the sleeve at one end close to the sleeve, a sealing rubber ring is arranged in the first groove, and the sealing rubber ring can form a sealed connection between the sleeve and the sleeve; the end of each sleeve away from the sleeve is fixedly connected to the catheter; the sleeve is sleeved on the outer wall of the catheter; a second groove is circumferentially arranged in the middle of the inner wall of the sleeve, and circumferentially arranged protrusions are formed at both ends of the second groove, and the protrusions are used to sleeve the outer wall of the sleeve. Through the targeted structural design, the difficulty of dismantling the connecting catheter system is greatly reduced, the sealing rubber ring replacement process is simple, the operation is convenient, and the applicability is strong.

Description

Technical Field

[0001] The invention relates to the technical field of connecting catheter systems, and in particular to a connecting catheter system and an assembly and disassembly method thereof. Background Art

[0002] Aircraft fuel systems or environmental control systems often involve connecting pipe systems.

[0003] A traditional connecting catheter system mainly includes two sleeves, two catheters and a sleeve; the two sleeves are respectively arranged at the two ends of the sleeve; the sleeve is sleeved on the outer wall of the sleeve; a first groove is axially arranged on the outer wall of the sleeve close to one end of the sleeve, and a sealing rubber ring is arranged in the first groove, and the sealing rubber ring can form a sealed connection between the sleeve and the sleeve; the end of each sleeve away from the sleeve is fixedly connected to the catheter; the sleeve is sleeved on the outer wall of the catheter.

[0004] After the connection catheter system is installed, the catheters at both ends are fixedly connected to the aircraft fuel system or environmental control system. When replacing the two sealing rubber rings, it is necessary to remove the catheter from the aircraft fuel system or environmental control system, and then pull the tube sleeve out of the sleeve to replace the new sealing rubber ring. The replacement process is relatively cumbersome. In addition, when dismantling the connection catheter system, it is often the case that only one catheter can be dismantled from the aircraft fuel system or environmental control system, and the other catheter cannot be dismantled due to work needs; the end of the detachable catheter can directly pull the tube sleeve out of the sleeve, but the end of the non-detachable catheter, holding the sleeve to pull the sleeve out of the tube sleeve is very difficult, which brings great inconvenience to the disassembly work. Summary of the invention

[0005] The purpose of the present invention is to provide a connecting catheter system and its assembly and disassembly method in view of the problems that the sealing rubber ring replacement process is cumbersome and the disassembly construction is difficult in the prior art connecting catheter system. Through the targeted structural design, the connecting catheter system provided by the present invention has greatly reduced the difficulty of disassembly operation, and the sealing rubber ring replacement process is simple, easy to operate, and has strong applicability.

[0006] In order to achieve the above object, the technical solution adopted by the present invention is:

[0007] A connecting catheter system includes two pipe sleeves, two catheters and a sleeve;

[0008] The two sleeves are respectively arranged at the two ends of the sleeve; the sleeve is sleeved on the outer wall of the sleeve; a first groove is axially arranged on the outer wall of the sleeve close to the sleeve, and a sealing rubber ring is arranged in the first groove, and the sealing rubber ring can form a sealed connection between the sleeve and the sleeve; the end of each sleeve away from the sleeve is fixedly connected to the conduit; the sleeve is sleeved on the outer wall of the conduit;

[0009] A second groove is circumferentially arranged at the middle of the inner wall of the sleeve, and circumferentially arranged protrusions are formed at both ends of the second groove, and the protrusions are used to sleeve the outer wall of the sleeve.

[0010] The connecting conduit system disclosed in the present invention has a targeted structural design for the sleeve, and a groove is circumferentially arranged in the middle of the inner wall of the sleeve, and the protrusions at both ends of the groove are used to sleeve the outer wall of the sleeve. In the process of dismantling the connecting conduit system, when only one conduit can be disassembled from the aircraft fuel system or the environmental control system, and the other conduit cannot be disassembled due to work needs, first pull out one sleeve, and then push the sleeve toward the other sleeve, after the sealing rubber ring leaks out, remove the sealing rubber ring, take out the sleeve, remove the sleeve, and complete the disassembly. When replacing two sealing rubber rings, there is no need to remove the two conduits from the connection and fixed position, and the sleeve can be directly pushed by external force to leak out the two grooves for holding the sealing rubber rings to implement the replacement of parts. In the pushing process, since the groove is circumferentially arranged in the middle of the inner wall of the sleeve, when the sealing ring passes through the groove, the compression amount is reduced, the friction force is reduced, and the difficulty of entering the other protrusion through the buffer of one groove is also greatly reduced, and the construction difficulty is reduced in the entire pushing process, which brings great convenience to the disassembly work and the replacement of parts.

[0011] Furthermore, the depth of the second groove is 0.2 mm to 0.5 mm. Preferably, the depth of the second groove is 0.2 mm, 0.3 mm, 0.4 mm, or 0.5 mm. If the depth is too small, the compression of the sealing ring will not be reduced much, resulting in a small reduction in friction, and the difficulty of disassembly cannot be reduced well. If the depth is too deep, the strength of the sleeve will be reduced, increasing the risk of damage.

[0012] Furthermore, the length of the second groove is 8 mm to 12 mm. Preferably, the length of the second groove is 8 mm, 9 mm, 10 mm, 11 mm or 12 mm. If the length is too small, the buffering degree is small during use, and it is difficult to reduce the difficulty of disassembly. If the length is too large, it will affect the installation effect of the sealing ring and reduce the strength of the pipe sleeve.

[0013] Furthermore, the slope of the side wall of the second groove is 10° to 20°. Preferably, the slope of the side wall of the second groove is 10°, 12°, 14°, 16°, 18° or 20°. If the slope is too small, the groove length will be increased in disguise, and the weight will be increased. If the slope is too large, the disassembly process will become difficult, affecting the use effect.

[0014] Furthermore, a bottom corner of the second groove is a rounded structure, and a transition connecting section between the second groove and the protrusion is a rounded structure.

[0015] Furthermore, a third groove is circumferentially provided on the outer wall of the sleeve, and the third groove is used to provide a hand-holding position.

[0016] Furthermore, a plurality of key grooves are provided at intervals in the circumferential direction on the inner wall of the sleeve in the contact area with the conduit. The key grooves are provided so that when the sleeve is sleeved on the outer wall of the conduit,.

[0017] Furthermore, the connecting catheter system also includes a clamp, which is used to clamp the sleeve to form a limiting effect on the sleeve.

[0018] Furthermore, the conduit is a low-pressure pipeline, and the conduit is an aircraft fuel pipe.

[0019] Another object of the present invention is to provide a method for assembling and disassembling the above-mentioned connecting catheter system.

[0020] A method for assembling and disassembling the above-mentioned connecting catheter system comprises the following steps:

[0021] Install the connecting conduit system:

[0022] Step a, respectively fixing and connecting the two groups of catheters to the sleeves;

[0023] Step b, installing the sealing rubber ring into the first groove;

[0024] Step c, installing the pipe sleeve obtained in step b into the sleeve; if there is a clamp, putting the clamp on the sleeve and locking it;

[0025] Step d: Then fix the two conduits on an aircraft or other fixed piles respectively to complete the installation.

[0026] Disassembling the connecting conduit system:

[0027] Step 1, remove the connection point between the conduit at one end and the aircraft or other fixed piles; then remove the clamp;

[0028] Step 2, holding the loosened catheter, and pulling out the pipe sleeve connected to the end of the loosened catheter from the sleeve;

[0029] Step 3, push the sleeve toward the pipe sleeve at the other end until the sealing rubber ring leaks out, and remove the sealing rubber ring;

[0030] Step 4: Take out the sleeve to complete the disassembly.

[0031] Furthermore, in step 3, the operation is performed with the aid of a tool such as a hammer at the beginning of the movement or during the entire movement process.

[0032] The invention discloses an installation process and a removal process of a connecting conduit system, which is easy to operate and has low operating difficulty.

[0033] In summary, due to the adoption of the above technical solution, the beneficial effects of the present invention are:

[0034] 1. The connecting conduit system disclosed in the present invention has a targeted structural design for the sleeve, and a groove is arranged circumferentially in the middle of the inner wall of the sleeve, and the protrusions at both ends of the groove are used to sleeve the outer wall of the sleeve. In the process of dismantling the connecting conduit system, if only one conduit can be disassembled from the aircraft fuel system or the environmental control system, and the other conduit cannot be disassembled due to work needs, first pull out one sleeve, and then push the sleeve toward the other sleeve, after the sealing rubber ring leaks out, remove the sealing rubber ring, take out the sleeve, remove the sleeve, and complete the disassembly. When replacing two sealing rubber rings, there is no need to remove the two conduits from the connected fixed position, and the parts can be replaced by directly pushing the sleeve with external force to leak out the two grooves for holding the sealing rubber rings. In the pushing process, since the groove is arranged circumferentially in the middle of the inner wall of the sleeve, when the sealing ring passes through the groove, the compression amount is reduced, the friction force is reduced, and the difficulty of entering the other protrusion through the buffer of one groove is also greatly reduced. The construction difficulty is reduced in the entire pushing process, which brings great convenience to the disassembly work and the replacement of parts.

[0035] 2. The present invention discloses the installation process and removal process of the connecting catheter system, which is easy to operate and has low operating difficulty. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] Figure 1 Schematic diagram of the structure of the connecting catheter system in Example 1.

[0037] Figure 2 This is a cross-sectional structural diagram of the connecting catheter system in Example 1.

[0038] Figure 3 for Figure 2 Enlarged view of sleeve shown.

[0039] Figure 4 This is a schematic diagram of the structure of the sleeve of Example 1.

[0040] Figure 5 This is an internal cross-sectional structural diagram of the sleeve in Example 1.

[0041] Figure 6 This is an external cross-sectional structural diagram of the sleeve in Example 1.

[0042] Figure 7 This is a diagram of the stresses to which the sleeve of the control group in Example 3 is subjected during the assembly and disassembly process.

[0043] Figure 8 This is a diagram of the deformation of the sleeve of the control group in Example 3 during the assembly and disassembly process.

[0044] Fig. 9 This is a diagram of the stresses to which the sleeve of the present application is subjected during the assembly and disassembly process in Example 3.

[0045] Fig.10 This is a diagram showing the deformation of the sleeve of the present application during the assembly and disassembly process in Example 3.

[0046] Fig.11 This is a graph showing the change in friction force during the sleeve displacement process of the control group in Example 3.

[0047] Fig.12 This is a diagram showing the change in friction force during the movement of the sleeve of the present application in Example 3.

[0048] Icon: 1-sleeve; 11-first groove; 111-sealing rubber ring; 12-keyway; 2-conduit; 3-sleeve; 31-second groove; 32-protrusion; 33-third groove; 4-clamp. DETAILED DESCRIPTION

[0049] The present invention will be described in detail below in conjunction with the accompanying drawings.

[0050] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0051] Example 1

[0052] like Figure 1 and Figure 2 As shown, a connecting conduit system of an aircraft fuel system comprises two pipe sleeves 1, two conduits 2, a sleeve 3, and a clamp 4. A plurality of key grooves 12 are circumferentially spaced apart on the inner wall of the pipe sleeve 1 in contact with the conduit 2.

[0053] The two pipe sleeves 1 are respectively arranged at the two ends of the sleeve 3; the sleeve 3 is sleeved on the outer wall of the pipe sleeve 1; a first groove 11 is axially arranged on the outer wall of the end of the pipe sleeve 1 close to the sleeve 3, and a sealing rubber ring 111 is arranged in the first groove 11, and the sealing rubber ring 111 can form a sealed connection between the sleeve 3 and the pipe sleeve 1; the end of each pipe sleeve 1 away from the sleeve 3 is fixedly connected to the conduit 2; the pipe sleeve 1 is sleeved on the outer wall of the conduit 2. The clamp 4 is used to clamp the sleeve 3 to form a limit effect on the sleeve 3.

[0054] like Figure 3 , Figure 4 and Figure 5 As shown, a second groove 31 is circumferentially arranged in the middle of the inner wall of the sleeve 3, and protrusions 32 are formed at both ends of the second groove 31. The protrusions 32 are used to sleeve the outer wall of the pipe sleeve 1; the depth of the second groove 31 is 0.4mm. The length of the second groove 31 is 10mm. The slope of the side wall of the second groove 31 is 15°. The bottom corner of the second groove 31 is a rounded structure, and the transition connection section between the second groove 31 and the protrusion 32 is a rounded structure. A third groove 33 is circumferentially arranged on the outer wall of the sleeve 3, and the third groove 33 is used to provide a hand-held position.

[0055] Install the connecting conduit system:

[0056] Step a, respectively sleeve the two sleeves 1 on the outer walls of the two catheters 2, and operate the inner wall of the catheter 2 through the dilator to extrude the sleeves 1 and the catheter 2 and fix them together;

[0057] Step b, inserting the sealing rubber ring 11 into the first groove 11;

[0058] Step c, installing the pipe sleeve 1 obtained in step b into the sleeve 3; sleeve the clamp 4 on the sleeve 3, and buckle and lock it;

[0059] Step d: Then fix the two conduits 2 to the aircraft fuel system respectively to complete the installation.

[0060] Example 2

[0061] In the installed connecting conduit system of Example 1, one conduit can be removed from the aircraft fuel system, while the other conduit cannot be removed due to work requirements.

[0062] Disassembling the connecting conduit system:

[0063] Step 1, remove the connection point between the conduit 2 at one end and the aircraft fuel system; then remove the clamp 4;

[0064] Step 2, holding the loosened catheter 2, and pulling out the sleeve 1 connected to the end of the loosened catheter 2 from the sleeve;

[0065] Step 3, push the sleeve toward the pipe sleeve 1 at the other end until the sealing rubber ring 11 leaks out, and remove the sealing rubber ring 11;

[0066] Step 4: Take out the sleeve 3 and remove the sleeve 1 to complete the disassembly.

[0067] To replace the two sealing rubber rings 111 , there is no need to remove the two conduits 2 from the connected and fixed positions. The parts can be replaced by directly pushing the sleeve with external force to reveal the two first grooves 11 for containing the sealing rubber rings 111 .

[0068] Through the targeted structural design, the difficulty of dismantling the connecting catheter system provided by the present invention is greatly reduced, the sealing rubber ring replacement process is simple, the operation is convenient, and the applicability is strong.

[0069] Example 3

[0070] The control group provides a connecting catheter system, which has the same structure as that of Example 1, except that the second groove 31 is not provided inside the sleeve 3 of the control group, and the inner wall of the sleeve 3 is flat. When the sleeve of the control group is used to perform the same steps of disassembly as in Example 2, it is difficult to push the sleeve in step 3.

[0071] like Figure 7 , 8 As shown, the disassembly process of Example 2 was analyzed by finite element analysis on the connecting catheter system of the control group, and the stress and deformation during the pushing process were tested.

[0072] like Fig. 9 and Fig.10 As shown, a finite element analysis was performed on the disassembly process of Example 2 using the connecting catheter system of Example 1, and stress and deformation tests were performed during the pushing process.

[0073] like Figure 7 As shown, the maximum stress of the control sleeve during the same assembly and disassembly process as Example 2 is 32MPa, while the yield strength of the aluminum alloy material is 284MPa, and there is no plastic deformation. Figure 8 As shown, the maximum deformation of the control group sleeve during the same assembly and disassembly process as Example 2 is 0.0147 mm.

[0074] The structural bearing capacity and weight of the sleeve of the control group and the sleeve of Example 1 are basically the same.

[0075] like Fig. 9As shown, the maximum stress of the sleeve structure of Example 1 is 34Mpa, and the maximum stress change rate before and after the improvement is 5.8%, which is a small change. Fig.10 The deformation shown is 0.0151mm, and the change rate of deformation before and after improvement is 2.6%, which is a small change.

[0076] As shown Fig.11 and Fig.12 As shown in the figure, the disassembly and assembly force of the elastic rubber ring and the sleeve is reduced by 78% in the thinning area before and after improvement, making disassembly and assembly easier.

[0077] The study found that during the pushing process, since there is a groove circumferentially arranged in the middle part of the inner wall of the sleeve, the compression amount is reduced when the sealing ring passes through the groove, the friction force is significantly reduced, and the difficulty of entering another protrusion through the buffer of one groove is also greatly reduced. The construction difficulty is reduced in the entire pushing process, which greatly facilitates the disassembly work and replacement of parts.

[0078] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A connecting catheter system, comprising two pipe sleeves (1), two catheters (2) and a sleeve (3); The two pipe sleeves (1) are respectively arranged at the two ends of the sleeve (3); the sleeve (3) is sleeved on the outer wall of the pipe sleeve (1); a first groove (11) is axially arranged on the outer wall of one end of the pipe sleeve (1) close to the sleeve (3), and a sealing rubber ring (111) is arranged in the first groove (11), and the sealing rubber ring (111) can form a sealed connection between the sleeve (3) and the pipe sleeve (1); one end of each pipe sleeve (1) away from the sleeve (3) is fixedly connected to the conduit (2); the pipe sleeve (1) is sleeved on the outer wall of the conduit (2); It is characterized in that A second groove (31) is circumferentially arranged in the middle of the inner wall of the sleeve (3), and protrusions (32) are circumferentially arranged at both ends of the second groove (31), and the protrusions (32) are used to sleeve the outer wall of the pipe sleeve (1); The depth of the second groove (31) is 0.2 mm to 0.5 mm; the length of the second groove (31) is 8 mm to 12 mm.

2. The connecting catheter system according to claim 1, characterized in that: The slope of the side wall of the second groove (31) is 10° to 20°.

3. The connecting catheter system according to claim 1, characterized in that: The bottom corner of the second groove (31) is a rounded structure, and the transition connection section between the second groove (31) and the protrusion (32) is a rounded structure.

4. The connecting catheter system according to claim 1, characterized in that: A third groove (33) is circumferentially arranged on the outer wall of the sleeve (3), and the third groove (33) is used to provide a hand-holding position.

5. The connecting catheter system according to claim 1, characterized in that: A plurality of key grooves (12) are arranged at circumferential intervals on the inner wall of the sleeve (1) in a contact area with the conduit (2).

6. The connecting catheter system according to claim 1, characterized in that: The connecting conduit system further comprises a clamp (4), wherein the clamp (4) is used to clamp the sleeve (3) to form a limiting effect on the sleeve (3).

7. The connecting catheter system according to any one of claims 1 to 6, characterized in that: The conduit (2) is a low-pressure pipeline, and the conduit (2) is an aircraft fuel pipe.

8. A method for assembling and disassembling a connecting catheter system according to any one of claims 1 to 7, characterized in that: include Follow these steps: Install the connecting conduit system: Step a, respectively fixing and connecting the two groups of catheters (2) to the sleeves (1); Step b, installing the sealing rubber ring (111) into the first groove (11); Step c, installing the pipe sleeve (1) obtained in step b into the sleeve (3); if there is a clamp (4), sleeve the clamp (4) on the sleeve (3), and buckle and lock it; Step d, then respectively fixing the two conduits (2) on an aircraft or other fixed piles to complete the installation; Disassembling the connecting conduit system: Step 1, removing the connection point between the conduit (2) at one end and the aircraft or other fixed piles; and then removing the clamp (4); Step 2, holding the loosened catheter (2), and pulling the loosened catheter (2) and the sleeve (1) connected to this end out of the sleeve together; Step 3, pushing the sleeve toward the pipe sleeve (1) at the other end until the sealing rubber ring (111) leaks out, and removing the sealing rubber ring (111); Step 4: Take out the sleeve (3), remove the sleeve (1), and complete the disassembly.

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