A connection structure for connecting the ignition cable to the joints at both ends of the metal hose

Abstract

The present application belongs to the technical field of design of connection of ignition cable to two-end joints of metal hose, and specifically relates to a connection structure of ignition cable to two-end joints of metal hose, including a tube shell and a tube sleeve; the tube shell is a step-shaped thick-walled structure; the large end of the tube shell is sleeved on the metal tube joint; the small end of the tube shell is inserted into the end of the metal hose, and the outer wall has a first annular crimping notch and a second annular crimping groove, wherein the cross-section of the first annular crimping notch is trapezoidal; there are two second annular crimping grooves, which are distributed on both axial sides of the first annular crimping notch; the tube sleeve is sleeved on the outer periphery of the end of the metal hose, and the metal hose is crimped in the first annular crimping notch and the two second annular crimping grooves; the tube sleeve has an outward folded edge toward one end of the tube shell, and the outward folded edge is abutted against the outer wall of the step turning part of the tube shell, and the outer edge of the outward folded edge is welded to the outer wall of the step turning part of the tube shell.

Description

Technical Field

[0001] The present application belongs to the technical field of design of connection between the two ends of an ignition cable and a metal hose, and specifically relates to a connection structure of the two ends of an ignition cable and a metal hose. Background Art

[0002] The main function of the ignition cable is to transmit the high-voltage electrical energy of the ignition device to the ignition nozzle for ignition.

[0003] The ignition cable is mainly composed of an ignition device connector, a metal hose, a center wire and an ignition nozzle connector. The ignition device connector and the ignition nozzle connector are connected to both ends of the metal hose, and the center wire is inside the metal hose, passing through the ignition device connector and the ignition nozzle connector to connect the ignition device and the ignition nozzle.

[0004] In the ignition cable, the metal hose is composed of a braided outer layer and a polytetrafluoroethylene tube inner layer. The outer braided layer and the inner polytetrafluoroethylene tube are combined to form a sealing structure to prevent liquid from penetrating into the interior of the metal hose. However, the two ends of the metal hose are mostly connected to the ignition device connector and the ignition nozzle connector by welding or crimping. The interface is difficult to seal effectively. Liquid can easily penetrate into the metal hose from the connection and flow into the ignition device and the ignition nozzle along the center wire or the inner walls of the connectors at both ends. In particular, there is a potential difference between the center contact point of the ignition cable and the ignition device and the ignition nozzle, which makes electrochemical corrosion prone to occur.

[0005] This application is proposed in view of the above-mentioned technical defects. Summary of the invention

[0006] The purpose of the present application is to provide a connection structure of an ignition cable and a metal hose at both ends, so as to overcome or alleviate at least one aspect of the known technical defects.

[0007] The technical solution of this application is:

[0008] An ignition cable connected to a metal hose at both ends of the joint connection structure, comprising a tube shell and a tube sleeve;

[0009] The tube shell is a stepped thick-walled structure; the large end of the tube shell is sleeved on the metal pipe joint; the small end of the tube shell is inserted into the end of the metal hose, and the outer wall has a first annular crimping notch and a second annular crimping groove, wherein the cross section of the first annular crimping notch is trapezoidal; there are two second annular crimping grooves, which are distributed on both sides of the axial direction of the first annular crimping notch;

[0010] The pipe sleeve is sleeved on the outer periphery of the end of the metal hose, and the metal hose is crimped into the first annular crimping notch and the two second annular crimping grooves;

[0011] One end of the tube sleeve facing the tube shell is provided with an outward folded edge, which is pressed against the outer wall of the step turning part of the tube shell, and the outer edge of the outward folded edge is welded to the outer wall of the step turning part of the tube shell.

[0012] According to at least one embodiment of the present application, in the above-mentioned ignition cable connected to the metal hose at both ends joint connection structure, the tube shell is made of 1Cr18Ni9Ti stainless steel material;

[0013] The pipe sleeve is made of 1Cr18Ni9Ti stainless steel.

[0014] According to at least one embodiment of the present application, in the above-mentioned ignition cable connected to the metal hose end joint connection structure, the large end of the tube shell and the outer wall of the metal tube joint are welded.

[0015] According to at least one embodiment of the present application, the above-mentioned ignition cable connected to the metal hose at both ends of the joint connection structure further includes an outer sleeve;

[0016] One end of the outer sleeve is sleeved on the outer periphery of the end of the metal hose, and the other end is sleeved on the outer periphery of the large end of the tube shell.

[0017] According to at least one embodiment of the present application, in the above-mentioned ignition cable connected to the metal hose at both ends joint connection structure, the outer wall of the large end of the tube shell is designed to have an annular protrusion;

[0018] The end portion of the outer sleeve facing one end of the tube shell abuts against the annular protrusion and is welded to the annular protrusion.

[0019] This application has at least the following beneficial technical effects:

[0020] Provided is a connection structure for connecting an ignition cable to joints at both ends of a metal hose. The structure is designed to use a pipe sleeve to crimp the end of the metal hose into a first annular crimping notch and two second annular crimping grooves on the outside of a pipe shell, and the pipe shell is designed to be welded to the metal pipe joint, the pipe sleeve, and the outer sleeve. While achieving the connection of the metal hose and the metal pipe joint, multiple sealing barriers are constructed. External liquid penetrates into the outer wall of an inner polytetrafluoroethylene tube through the outer braided layer of the metal hose. When flowing along the outer wall of the inner polytetrafluoroethylene tube, it is blocked by multiple sealing barriers and is difficult to continue flowing, and will be evaporated on the outside. This can prevent external liquid from penetrating and flowing into the ignition device and the ignition nozzle along the center wire or the inner walls of the joints at both ends. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a schematic diagram of the connection structure of the ignition cable and the joints at both ends of the metal hose provided in the embodiment of the present application;

[0022] Figure 2 is a schematic diagram of a tube shell provided in an embodiment of the present application;

[0023] Figure 3 This is a schematic diagram of the configuration after the pipe sleeve provided in the embodiment of the present application first crimps the metal hose (4) into the first annular crimping notch;

[0024] in:

[0025] 1-tube shell; 2-tube sleeve; 3-outer tube; 4-metal hose; 5-metal pipe joint; 6-center conductor;

[0026] A-first annular crimping notch; B-second annular crimping groove.

[0027] In order to better illustrate the present embodiment, some parts of the drawings may be omitted, enlarged or reduced, and do not represent the size of the actual product. In addition, the drawings are only used for illustrative purposes and should not be construed as limitations on the present application. DETAILED DESCRIPTION

[0028] In order to make the technical solution and advantages of the present application clearer, the technical solution of the present application will be described in further detail in detail and in detail with reference to the accompanying drawings. It can be understood that the specific embodiments described here are only partial embodiments of the present application, which are only used to explain the present application, not to limit the present application. It should be noted that, for the convenience of description, only the parts related to the present application are shown in the accompanying drawings, and other related parts can refer to the general design.

[0029] In addition, unless otherwise defined, the technical terms or scientific terms used in the description of this application shall have the usual meanings understood by those of ordinary skill in the art to which this application belongs. The words used in the description of this application to indicate orientation are only used to indicate relative directions or positional relationships. When the absolute position of the described object changes, its relative positional relationship may also change accordingly. The word "include" used in the description of this application indicates that the elements or objects appearing before the word include the elements or objects listed after the word and their equivalents, but does not exclude other elements or objects.

[0030] In addition, it should be noted that, unless otherwise clearly specified and limited, the words "installation", "connection" and similar terms used in the description of this application should be understood in a broad sense. For example, the connection can be a fixed connection or a detachable connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium. Technical personnel in the field can understand its specific meaning in this application according to the specific circumstances.

[0031] A connection structure for connecting an ignition cable to a metal hose at both ends, such as Figure 1 As shown, it includes a tube shell 1, a tube sleeve 2, and an outer sleeve 3.

[0032] The tube shell 1 is made of 1Cr18Ni9Ti stainless steel material and has a stepped thick-walled structure. Figure 2 shown.

[0033] The large end of the tube shell 1 is sleeved on the metal tube joint 5, and the end is welded to the outer wall of the metal tube joint 5 to prevent external liquid from seeping in. The metal tube joint 5 can be an ignition device joint or an ignition nozzle joint.

[0034] The small end of the tube shell 1 is inserted into the end of the metal hose 4, and the outer wall has a first annular crimping notch A and a second annular crimping groove B, wherein the cross section of the first annular crimping notch A is trapezoidal; there are two second annular crimping grooves B, which are distributed on both sides of the first annular crimping notch A in the axial direction.

[0035] The pipe sleeve 2 is made of 1Cr18Ni9Ti stainless steel material and has a thin-wall structure.

[0036] The pipe sleeve 2 is sleeved on the outer periphery of the end of the metal hose 4, and the metal hose 4 is crimped in the first annular crimping notch A and two second annular crimping grooves B, thereby forming three sealing barriers.

[0037] When the sleeve 2 is crimped, the metal hose 4 can be crimped into the first annular crimping notch A. At this time, the sleeve 2 is shaped as follows: Figure 3 As shown, the metal hose 4 is crimped into the two second annular crimping grooves B. The trapezoidal design of the first annular crimping notch A can provide a margin for the pipe sleeve 2 to be crimped in the two second annular crimping grooves B, thereby avoiding the generation of large structural stress.

[0038] The end of the tube sleeve 2 facing the tube shell 1 has an outward folded edge, and the outward folded edge is abutted against the outer wall of the step turning part of the tube shell 1. The outer edge of the outward folded edge is welded to the outer wall of the step turning part of the tube shell 1. The welding method of this structure keeps the welding part away from the metal hose 4, which can avoid the high temperature of welding from burning the polytetrafluoroethylene tube inside the metal hose 4 and avoid the infiltration of external liquid from there.

[0039] One end of the outer sleeve 3 is sleeved on the outer periphery of the end of the metal hose 4, and the other end is sleeved on the outer periphery of the large end of the tube shell 1, which can prevent external liquid from entering.

[0040] The outer wall of the large end of the tube shell 1 is designed to have an annular protrusion, and the end of the outer sleeve 3 facing one end of the tube shell 1 abuts against the annular protrusion and is welded to the annular protrusion to prevent external liquid from penetrating therefrom.

[0041] In the connection structure of the ignition cable connected to the two end joints of the metal hose disclosed in the above embodiment, the sleeve 2 is designed to crimp the end of the metal hose 4 into a first annular crimping notch A and two second annular crimping grooves B on the outside of the tube shell 1, and the tube shell 1 is designed to be welded to the metal tube joint 5, the sleeve 2, and the outer sleeve 3. While realizing the connection between the metal hose 4 and the metal tube joint 5, multiple sealing barriers are constructed. External liquid penetrates into the outer wall of the inner polytetrafluoroethylene tube through the outer braided layer of the metal hose 4, and the flow along the outer wall of the inner polytetrafluoroethylene tube will be blocked by multiple sealing barriers and it is difficult to continue to flow. In addition, the ignition cable is arranged outside the aircraft engine and will be affected by the high temperature of the aircraft engine. The liquid will be evaporated by the high temperature on the outside, thereby effectively preventing external liquid from penetrating and flowing into the ignition device and the ignition nozzle along the center conductor 6 or the inner walls of the two end joints.

[0042] So far, the technical solution of the present application has been described in conjunction with the preferred embodiments shown in the accompanying drawings. Those skilled in the art should understand that the scope of protection of the present application is obviously not limited to these specific embodiments. Without departing from the principles of the present application, those skilled in the art can make equivalent changes or substitutions to the relevant technical features, and the technical solutions after these changes or substitutions will fall within the scope of protection of the present application.

Claims

1. A connection structure for connecting an ignition cable to a metal hose at both ends, characterized in that: It comprises a tube shell (1) and a tube sleeve (2); The tube shell (1) is a stepped thick-walled structure; the large end of the tube shell (1) is sleeved on the metal tube joint (5); the small end of the tube shell (1) is inserted into the end of the metal hose (4); the outer wall of the tube shell (1) has a first annular crimping notch (A) and a second annular crimping groove (B), wherein the cross section of the first annular crimping notch (A) is trapezoidal; there are two second annular crimping grooves (B), which are distributed on both sides of the axial direction of the first annular crimping notch (A); The pipe sleeve (2) is sleeved on the outer circumference of the end of the metal hose (4) to crimp the metal hose (4) into the first annular crimping notch (A) and the two second annular crimping grooves (B); The end of the tube sleeve (2) facing the tube shell (1) has an outward folded edge, which is in contact with the outer wall of the step turning part of the tube shell (1), and the outer edge of the outward folded edge is welded to the outer wall of the step turning part of the tube shell (1).

2. The ignition cable and metal hose joint connection structure according to claim 1, characterized in that: The tube shell (1) is made of 1Cr18Ni9Ti stainless steel material; The pipe sleeve (2) is made of 1Cr18Ni9Ti stainless steel material.

3. The ignition cable and metal hose joint connection structure according to claim 2, characterized in that: The large end of the tube shell (1) is connected to the outer wall of the metal tube joint (5) by welding.

4. The ignition cable and metal hose joint connection structure according to claim 3, characterized in that: Also includes an outer sleeve (3); One end of the outer sleeve (3) is sleeved on the outer periphery of the end of the metal hose (4), and the other end is sleeved on the outer periphery of the large end of the tube shell (1).

5. The ignition cable and metal hose joint connection structure according to claim 4, characterized in that: The outer wall of the large end of the tube shell (1) is designed to have an annular protrusion; The end of the outer sleeve (3) facing one end of the tube shell (1) abuts against the annular protrusion and is welded to the annular protrusion.

Images