Ignition electric nozzle used for aero-engine and integrally connected with ignition cable

Abstract

The ignition electric nozzle used for the aero-engine and integrally connected with the ignition cable comprises an ignition nozzle shell, an insulator and a central electrode, the insulator is arranged in the ignition nozzle shell, and the central electrode is arranged in the middle of the insulator; an ignition cable is arranged at one end of the sparking plug shell and comprises a cable elbow and an ignition wire arranged in the cable elbow, one end of the ignition wire extends into the sparking plug shell and is welded or crimped with one end of the central electrode, and the free end of the cable elbow is fixedly inserted between the sparking plug shell and the insulator; the lap joint end of the sparking plug shell is fixed to the cable elbow in a fusion welding mode. The ignition cable and the ignition electric nozzle are designed into a whole, the reliability of electric connection of the ignition cable and the ignition electric nozzle is achieved in a welding / crimping mode, the work of independently installing and debugging the ignition cable and the ignition electric nozzle in an external field is reduced, and the ignition cable and the ignition electric nozzle have good practicability.

Description

Technical Field

[0001] The utility model belongs to the technical field of engine ignition equipment, and in particular relates to an ignition nozzle which is used for an aircraft engine and is integrally connected with an ignition cable. Background Art

[0002] The aircraft engine ignition system includes an ignition device, an ignition cable, and an ignition nozzle. The ignition device converts low-voltage electricity from the aircraft or the ground into high-voltage electrical energy pulses, transmits them to the ignition nozzle through the ignition cable, and converts them into electric sparks at the ignition end of the ignition nozzle, igniting the combustible mixture in the engine combustion chamber. The electrical connection between the ignition cable and the ignition nozzle includes the connection of the anode and the connection of the cathode. There are two main ways to connect the anode: one is that the anode of the ignition cable is connected to the anode of the ignition nozzle through a spring crimping form, and the other is that the anode of the ignition cable is connected to the anode of the ignition nozzle through a pin / socket form. The cathode is generally electrically connected through threads. However, during the use of the electrical connection between the ignition cable and the ignition nozzle, there are the following problems:

[0003] a) The electrical contact is contaminated, resulting in poor contact;

[0004] b) The anode spring crimping form has the problem of small contact force, severe heat generation at the contact point, large energy loss, and risk of false connection during vibration;

[0005] c) The anode pin / socket form has the risk of low insertion and extraction force, discharge at the contact point, and false connection during vibration;

[0006] d) During the disassembly and assembly process, thread adhesion occurs.

[0007] The above problems lead to unreliable electrical connection between the ignition cable and the ignition nozzle, affecting the reliability of engine starting and ignition, and increasing the work of field installation and debugging. Utility Model Content

[0008] The utility model aims to provide an ignition nozzle for an aircraft engine and integrally connected with an ignition cable, aiming to solve the above-mentioned problem.

[0009] The utility model is mainly realized through the following technical solutions:

[0010] An ignition nozzle for an aircraft engine and integrally connected to an ignition cable, comprising a nozzle housing, an insulator, and a center electrode, wherein the nozzle housing is provided with an insulator, and the center electrode is provided in the middle of the insulator; an ignition cable is provided at one end of the nozzle housing, and the ignition cable comprises a cable elbow and an ignition wire arranged inside the cable elbow, one end of the ignition wire extends into the nozzle housing and is welded or crimped to one end of the center electrode, the free end of the cable elbow is fixedly inserted between the nozzle housing and the insulator, and the overlapping end of the nozzle housing is fixed to the cable elbow by fusion welding.

[0011] In order to better realize the utility model, further, the ignition nozzle also includes a movable threaded sleeve, the outer sliding sleeve of the nozzle shell is provided with a movable threaded sleeve, and the outer side of the nozzle shell is provided with a shell boss along the circumferential direction, and the outer diameter of the shell boss is smaller than the outer diameter of the movable threaded sleeve; a threaded mounting seat is provided on the engine corresponding to the movable threaded sleeve to realize a threaded connection with the threaded mounting seat of the engine by rotating the movable threaded sleeve, and the shell boss is pressed and limited.

[0012] In order to better implement the utility model, further, a stepped end surface is provided on the inner wall of one end of the nozzle housing close to the ignition cable, and the free end of the cable elbow is fixedly inserted in a groove formed by the stepped end surface of the nozzle housing and the insulator.

[0013] In order to better realize the utility model, further, the cable elbow includes a main pipe and a connecting pipe, one end of the main pipe is provided with a connecting end, and the connecting end is rotatably connected to one end of the connecting pipe; a threaded bushing is provided on the outer side of one end of the insulator close to the ignition cable, the step end surface of the nozzle housing and the threaded bushing form a threaded connecting hole, and the other end of the connecting pipe is threadedly connected to the threaded connecting hole.

[0014] In order to better realize the utility model, further, one end of the central electrode is provided with a connecting groove, and one end of the ignition wire is correspondingly provided with a plug-in protrusion.

[0015] In order to better realize the utility model, further, a plurality of clamping protrusions are arranged on the outer side of the plug-in protrusion, and a plurality of clamping grooves are correspondingly arranged inside the connecting groove.

[0016] The beneficial effects of the utility model are as follows:

[0017] (1) The utility model is different from the currently commonly used method that the ignition cable and the ignition nozzle are separate accessories and the electrical connection is achieved through a connector during engine assembly. Instead, the ignition cable and the ignition nozzle are designed as a whole, and the reliability of the electrical connection between the ignition cable and the ignition nozzle is achieved by welding / crimping, which reduces the installation and debugging work of the ignition cable and the ignition nozzle separately in the field, and has better practicality;

[0018] (2) High reliability and safety of electrical connection. The utility model designs the electrical connection parts of the ignition cable and the ignition nozzle as a whole, and realizes the electrical connection of the ignition cable and the ignition nozzle by welding or crimping, so that there will be no false connection; at the same time, the electrical contact parts are sealed in the metal cavity, which can effectively prevent the electrical contact parts from being contaminated by engine oil, and there will be no internal poor contact that causes creepage and ignition of combustible gas, which has good practicality;

[0019] (3) Low energy loss. The utility model reduces the physical structure of the electrical connection by designing the ignition cable and the ignition nozzle electrical connection part as a whole, which can effectively reduce the line resistance and reduce the ignition energy loss;

[0020] (4) Light weight, high processing efficiency, and high installation efficiency. The utility model designs the ignition cable and the ignition nozzle as a whole, which can reduce the parts at the connection part, such as the connection nut, and can effectively reduce the product weight, reduce the processing time, and improve the processing efficiency. During field assembly, there is no need to connect and debug the ignition cable and the ignition nozzle, which can reduce the installation time and improve the installation efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 The utility model is a connection structure diagram of an ignition nozzle and an ignition cable for an aero-engine.

[0022] Among them: 1-movable threaded sleeve, 2-insulator, 3-nozzle shell, 4-cable elbow, 5-ignition wire, 6-lap end, 7-connection groove, 8-center electrode, 9-shell boss. DETAILED DESCRIPTION

[0023] Embodiment 1:

[0024] An ignition nozzle for an aircraft engine and integrally connected to an ignition cable, comprising a nozzle housing 3, an insulator 2, and a center electrode 8, wherein the nozzle housing 3 is provided with an insulator 2, and the center electrode 8 is provided in the middle of the insulator 2; an ignition cable is provided at one end of the nozzle housing 3, and the ignition cable comprises a cable elbow 4 and an ignition wire 5 arranged inside the cable elbow 4, one end of the ignition wire 5 extends into the nozzle housing 3 and is welded or crimped with one end of the center electrode 8, the free end of the cable elbow 4 is fixedly inserted between the nozzle housing 3 and the insulator 2, and the overlapping end 6 of the nozzle housing 3 is fixedly welded to the cable elbow 4.

[0025] Preferably, a step groove is provided on the inner wall of the end of the nozzle housing 3 close to the ignition cable, and the free end of the cable elbow 4 is fixedly inserted in the step groove of the nozzle housing 3 and abuts against the insulator 2. Specifically, the cable elbow 4 includes a main pipe and a connecting pipe, one end of the main pipe is provided with a connecting end, and the connecting end is rotatably connected to one end of the connecting pipe; a threaded bushing is provided on the outer side of the end of the insulator 2 close to the ignition cable, a threaded connection hole is formed between the step groove of the nozzle housing 3 and the threaded bushing, and the other end of the connecting pipe is threadedly connected to the threaded connection hole.

[0026] Preferably, one end of the center electrode 8 is provided with a connection groove 7, and one end of the ignition wire 5 is correspondingly provided with a plug-in protrusion. Specifically, the outer side of the plug-in protrusion is provided with a plurality of clamping protrusions, and the inner side of the connection groove 7 is correspondingly provided with a plurality of clamping grooves.

[0027] During the use of the utility model, in order to ensure that the ignition nozzle does not rotate when it is installed and tightened on the engine, a movable threaded sleeve 1 is designed on the nozzle housing 3. During installation, the movable threaded sleeve 1 is rotated to connect with the engine thread, and the boss on the nozzle housing 3 is pressed and limited. Then, the insulator 2 is installed in the nozzle housing 3, and a center electrode 8 is provided in the middle of the insulator 2. According to the specifications of the ignition wire 5, the size of the center electrode 8 is designed, and a matching crimping tool is selected to crimp the ignition wire 5 and the center electrode 8 together. Assemble the crimped center electrode 8 and ignition wire 5 and fix them. Finally, the cable elbow 4 is connected to the nozzle housing 3 and fixed by fusion welding at the overlap.

[0028] Embodiment 2:

[0029] An ignition nozzle for an aircraft engine and integrally connected to an ignition cable, such as Figure 1 As shown, the ignition nozzle includes a nozzle housing 3, an insulator 2, and a center electrode 8. The insulator 2 is arranged inside the nozzle housing 3, and the center electrode 8 is arranged in the middle of the insulator 2; the ignition cable includes a cable elbow 4 and an ignition wire 5 arranged inside the cable elbow 4, one end of the ignition wire 5 extends into the nozzle housing 3 and is welded or crimped with one end of the center electrode 8, and the lap end 6 of the nozzle housing 3 is fixed to the free end of the cable elbow 4 by fusion welding.

[0030] The ignition nozzle also includes a movable threaded sleeve 1, the outer sliding sleeve of the nozzle housing 3 is provided with the movable threaded sleeve 1, and the outer side of the nozzle housing 3 is provided with a shell boss 9 along the circumferential direction, and the outer diameter of the shell boss 9 is smaller than the outer diameter of the movable threaded sleeve 1; a threaded mounting seat is provided on the engine corresponding to the movable threaded sleeve 1, so as to realize the threaded connection with the threaded mounting seat of the engine by rotating the movable threaded sleeve 1, and the shell boss 9 is pressed and limited.

[0031] The inner wall of the end of the nozzle housing 3 close to the ignition cable is provided with a step groove, and the free end of the cable elbow 4 is fixedly inserted in the step groove of the nozzle housing 3 and abuts against the insulator 2. Further, the cable elbow 4 includes a main pipe and a connecting pipe, one end of the main pipe is provided with a connecting end, and the connecting end is rotatably connected to one end of the connecting pipe; the outer side of the end of the insulator 2 close to the ignition cable is provided with a threaded bushing, the step end surface of the nozzle housing 3 and the threaded bushing form a threaded connection hole, and the other end of the connecting pipe is threadedly connected to the threaded connection hole.

[0032] During the use of the utility model, in order to ensure that the ignition nozzle does not rotate when it is installed and tightened on the engine, a movable threaded sleeve 1 is designed on the nozzle housing 3. During installation, the movable threaded sleeve 1 is rotated to connect with the engine thread, and the boss on the nozzle housing 3 is pressed and limited. Then, the insulator 2 is installed in the nozzle housing 3, and a center electrode 8 is provided in the middle of the insulator 2. According to the specifications of the ignition wire 5, the size of the center electrode 8 is designed, and a matching crimping tool is selected to crimp the ignition wire 5 and the center electrode 8 together. Assemble the crimped center electrode 8 and ignition wire 5 and fix them. Finally, the cable elbow 4 is connected to the nozzle housing 3 and fixed by fusion welding at the overlap.

[0033] The utility model is different from the currently commonly used method in which the ignition cable and the ignition nozzle are separate accessories and the electrical connection is achieved through a connector when the engine is assembled. Instead, the ignition cable and the ignition nozzle are designed as a whole, and the reliability of the electrical connection between the ignition cable and the ignition nozzle is achieved by welding / crimping, which reduces the installation and debugging work of the ignition cable and the ignition nozzle separately in the field, and has good practicality.

[0034] The above description is only a preferred embodiment of the present invention and does not limit the present invention in any form. Any simple modification or equivalent changes made to the above embodiments based on the technical essence of the present invention shall fall within the protection scope of the present invention.

Claims

1. An ignition nozzle for an aircraft engine and integrally connected to an ignition cable, characterized in that: The invention comprises a nozzle housing (3), an insulator (2), and a central electrode (8), wherein the nozzle housing (3) is provided with an insulator (2), and the central electrode (8) is provided in the middle of the insulator (2); an ignition cable is provided at one end of the nozzle housing (3), and the ignition cable comprises a cable bend (4) and an ignition wire (5) provided inside the cable bend (4); one end of the ignition wire (5) extends into the nozzle housing (3) and is welded or crimped to one end of the central electrode (8); the free end of the cable bend (4) is fixedly inserted between the nozzle housing (3) and the insulator (2), and the overlapping end (6) of the nozzle housing (3) is fixedly welded to the cable bend (4).

2. An ignition nozzle for an aircraft engine and integrally connected to an ignition cable according to claim 1, characterized in that: The ignition nozzle further comprises a movable threaded sleeve (1); the outer sliding sleeve of the nozzle housing (3) is provided with the movable threaded sleeve (1); the outer side of the nozzle housing (3) is provided with a housing boss (9) along the circumferential direction; and the outer diameter of the housing boss (9) is smaller than the outer diameter of the movable threaded sleeve (1); a threaded mounting seat is provided on the engine corresponding to the movable threaded sleeve (1) so as to realize threaded connection with the threaded mounting seat of the engine by rotating the movable threaded sleeve (1), and to be pressed and limited by the housing boss (9).

3. An ignition nozzle for an aircraft engine and integrally connected with an ignition cable according to claim 1 or 2, characterized in that: The inner wall of one end of the nozzle housing (3) close to the ignition cable is provided with a stepped end surface, and the free end of the cable elbow (4) is fixedly inserted into a groove formed by the stepped end surface of the nozzle housing (3) and the insulator (2).

4. The ignition nozzle for an aircraft engine and integrally connected with an ignition cable according to claim 3, characterized in that: The cable elbow (4) comprises a main pipe and a connecting pipe, one end of the main pipe is provided with a connecting end, and the connecting end is rotatably connected to one end of the connecting pipe; a threaded bushing is provided on the outer side of one end of the insulator (2) close to the ignition cable, the stepped end surface of the nozzle housing (3) and the threaded bushing form a threaded connection hole, and the other end of the connecting pipe is threadedly connected to the threaded connection hole.

5. The ignition nozzle for an aircraft engine and integrally connected with an ignition cable according to claim 1, characterized in that: One end of the central electrode (8) is provided with a connection groove (7), and one end of the ignition wire (5) is correspondingly provided with a plug-in protrusion.

6. The ignition nozzle for an aircraft engine and integrally connected with an ignition cable according to claim 5, characterized in that: A plurality of snap-fitting protrusions are arranged on the outer side of the plug-in protrusion, and a plurality of snap-fitting grooves are correspondingly arranged inside the connecting groove (7).

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