Ground suspended combustion chamber igniter

Abstract

The application discloses a ground-suspended igniter for combustion chamber, which comprises a locking electrode, a high-voltage end, a first shell, a first ceramic, a second ceramic, a second shell and a third ceramic, wherein the locking electrode is threadedly connected with the high-voltage end; the first shell is located at the periphery of the locking electrode and the high-voltage end; the first ceramic is located between the locking electrode and the first shell, and the first ceramic is sealed with the first shell; the second ceramic is located between the high-voltage end and the first shell; the second shell is located at the periphery of the first shell, and the two ends of the second shell are threadedly connected with the combustion chamber and an ignition cable respectively; and the third ceramic is located between the first shell and the second shell, and the third ceramic is sealed with the first shell and the second shell respectively. The first shell is arranged between the traditional high-voltage electrode and the second shell, so that the ground electrode is suspended relative to the combustion chamber, high-energy high-frequency discharge work can be realized, and electromagnetic interference on other electrical systems can be avoided.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of aerospace engine combustion chamber ignition system, and more particularly to a ground-suspended combustion chamber igniter. BACKGROUND

[0002] Reusable space-aircraft is the key link to realize rapid and efficient space-aircraft transportation, and is developing towards larger airspace, wider speed domain and better reusability. Engine is the "heart" of the aircraft, and power propulsion technology is the core technology of the aircraft. Turbine-dual-mode ramjet combined power is the key technology for the development of reusable space-aircraft, and realizes stable operation of the aircraft in a wide speed range of 0-6Ma, which is a major technical requirement. The engine in a large airspace and a wide speed domain requires a quick and reliable ignition system with reusability. The ignition system of the engine for the space-aircraft needs to meet the relevant requirements of the equipment grounding in the aircraft product circuit design specification. The equipment grounding of the aircraft electrical system can prevent static electricity accumulation and static discharge, and provide a unified zero potential for the electrical / electronic system, and can also reduce strong electromagnetic interference caused by electromagnetic field or other forms of induced coupling. In order to meet the performance requirements of horizontal take-off and landing and reusability of the space-aircraft, the electrical equipment grounding of the aircraft usually adopts a floating scheme, which requires the return line of the high-voltage primary and secondary power supply of the ignition system to not return through the combustion chamber structure at any time.

[0003] However, the traditional combustion chamber igniter generally includes a center high-voltage electrode and a shell ground electrode, the shell is connected with the combustion chamber, and the high-voltage discharge generated by the ignition power supply flows back to the ignition power supply through the high-voltage electrode and the shell in turn. The current passing through the shell will cause a weak potential difference change, and the potential difference has strong randomness and high change frequency, which is easy to cause electromagnetic interference to affect the normal operation of the electrical equipment in the aircraft cabin.

[0004] Therefore, it is an urgent problem for those skilled in the art to provide a ground-suspended combustion chamber igniter to avoid electromagnetic interference. SUMMARY

[0005] Therefore, the present application provides a ground-suspended combustion chamber igniter to solve the problem of common grounding of the spark plug and the engine, and effectively solves the electrical system interference problem.

[0006] In order to achieve the above purpose, the present application adopts the following technical scheme:

[0007] The application discloses a ground-suspension type igniter of a combustion chamber, which comprises a locking electrode, a high-pressure end, a first shell, a first ceramic, a second ceramic, a second shell and a third ceramic, wherein the locking electrode is threadedly connected with the high-pressure end; the first shell is located at the periphery of the locking electrode and the high-pressure end; the first ceramic is located between the locking electrode and the first shell, and the first ceramic is sealed with the first shell; the second ceramic is located between the high-pressure end and the first shell; the second shell is located at the periphery of the first shell, and the two ends of the second shell are threadedly connected with the combustion chamber and an ignition cable respectively; and the third ceramic is located between the first shell and the second shell, and the third ceramic is sealed with the first shell and the second shell respectively.

[0008] By adopting the above technical scheme, the application has the following beneficial effects:

[0009] By adding the first shell between the traditional high-pressure electrode and the second shell, the purpose of suspending the ground electrode relative to the combustion chamber is achieved, high-energy high-frequency discharge work can be realized, and electromagnetic interference on other electrical systems can be avoided.

[0010] Further, the first connecting ring, the first connecting bush and the second connecting bush are further included, the first connecting ring is located between the first ceramic and the first shell, and the first connecting ring is welded with the first shell; the first connecting bush is located between the first shell and the third ceramic, and the first connecting bush is welded with the first shell; and the second connecting bush is welded at the end of the first shell close to the first connecting bush.

[0011] The beneficial effects of the above further technical scheme are that the structural strength of the first ceramic and the third ceramic is increased.

[0012] Further, the second connecting ring and the third connecting bush are further included, the second connecting ring is located between the third ceramic and the second shell, and the second connecting ring is welded with the second shell; and the third connecting bush is welded at the end of the second shell close to the second connecting ring.

[0013] The beneficial effects of the above further technical scheme are that the third ceramic is fixed and the structural strength of the third ceramic is increased, so that the third ceramic is prevented from cracking under vibration and high temperature and high pressure.

[0014] Further, the locking electrode and the high-pressure end are both in the form of a boss structure; the outer thread cylinder at the bottom of the locking electrode is threadedly connected with the threaded hole at the top of the high-pressure end.

[0015] Further, the first shell, the first connecting ring, the first connecting bush and the second connecting bush are of the same material, and are all metal materials.

[0016] Further, the second shell is made of high-temperature-resistant alloy steel. BRIEF DESCRIPTION OF DRAWINGS

[0017] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiments or the prior art description. Obviously, the drawings in the following description only are a part of the present application, and for those skilled in the art, other drawings can be obtained without creative effort based on the provided drawings.

[0018] Figure 1 The drawing is a structural schematic view of a ground-suspended combustion chamber igniter provided by the present application.

[0019] Figure 2 The drawing is Figure 1 A-A sectional view. DETAILED DESCRIPTION

[0020] The technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative effort belong to the protection scope of the present application.

[0021] As Figure 1 , 2As shown, the embodiment of the present application discloses a ground suspension type combustion chamber igniter, which comprises a locking electrode 1, a high-pressure end head 2, a first shell 3, a first ceramic 4, a second ceramic 5, a second shell 6 and a third ceramic 7, the locking electrode 1 is threadedly connected with the high-pressure end head 2, in the embodiment, the locking electrode 1 and the high-pressure end head 2 are both in the form of bosses, the outer thread cylinder at the bottom of the locking electrode 1 is threadedly connected with the threaded hole at the top of the high-pressure end head 2, the high-pressure end head 2 is made of high-temperature-resistant, high-pressure-resistant, corrosion-resistant and oxidation-resistant high-temperature alloy material; the first shell 3 is located at the periphery of the locking electrode 1 and the high-pressure end head 2; the first ceramic 4 is located between the locking electrode 1 and the first shell 3, and the first ceramic 4 is sealed with the first shell 3, in the embodiment, the first ceramic 4 and the first shell 3 are air-tightly sealed through a glass sealing process; the second ceramic 5 is located between the high-pressure end head 2 and the first shell 3, on the one hand, the second ceramic 5 plays a role of compressing and fixing the high-pressure end head 2 and increasing the structural strength, on the other hand, because the second ceramic 5 is an insulator, the electric arc generated by the breakdown discharge between the high-pressure end head 2 and the first shell 3 can be constrained at the discharge end of the high-pressure end head 2, thereby increasing the spark penetration depth; the second shell 6 is located at the periphery of the first shell 3, in the embodiment, the second shell 6 is made of high-temperature-resistant alloy steel material, and the two ends of the second shell 6 are respectively provided with external threads to be threadedly connected with the combustion chamber and the ignition cable; the third ceramic 7 is located between the first shell 3 and the second shell 6, and the third ceramic 7 is sealed with the first shell 3 and the second shell 6, respectively, in the embodiment, the third ceramic 7 and the first shell 3 and the second shell 6 are air-tightly sealed through a glass sealing process. The first shell 3 is arranged between the traditional high-pressure electrode and the second shell 6, so that the ground electrode is suspended relative to the combustion chamber, high-energy high-frequency discharge work can be realized, and electromagnetic interference on other electrical systems can be avoided.

[0022] In order to further optimize the technical scheme of the present application, the first connecting ring 8, the first connecting bush 9 and the second connecting bush 10 are further arranged, in the embodiment, the first shell 3, the first connecting ring 8, the first connecting bush 9 and the second connecting bush 10 are made of the same material, and are all made of metal material, the first connecting ring 8 is located between the first ceramic 4 and the first shell 3, and is welded with the first shell 3, and the first connecting ring 8 is in the form of a circular ring; the first connecting bush 9 is located between the first shell 3 and the third ceramic 7, and is welded with the first shell 3; the second connecting bush 10 is welded at the end of the first shell 3 close to the first connecting bush 9, so as to increase the structural strength of the first ceramic 4 and the third ceramic 7.

[0023] In order to further optimize the technical scheme of the application, the second connecting ring 11 and the third connecting bush 12 are further included, the second connecting ring 11 is located between the third ceramic 7 and the second shell 6, and the second connecting ring 11 is welded with the second shell 6; the third connecting bush 12 is welded at the end of the second shell 6 close to the second connecting ring 11, so as to fix and strengthen the structural strength of the third ceramic 7, and prevent the third ceramic 7 from cracking under vibration and high temperature and high pressure environment.

[0024] The working principle of the application is as follows:

[0025] The high-voltage discharge generated by the ignition power source passes through the locking electrode 1 and the high-voltage end 2 in turn, and then breaks down between the high-voltage end 2 and the first shell 3, forming a high-voltage arc. After the current passes through the first shell 3, it is connected with the low-voltage loop of the ignition cable through the second connecting bush 10. During the entire discharge process, the current is constrained inside the third ceramic 7 and does not flow through the second shell 6. Since the second shell 6 is directly connected with the combustion chamber, the current does not flow through the wall surface of the combustion chamber, and thus the potential change is not caused, which ensures that the potential of the combustion chamber shell is not affected by the discharge of the spark igniter, thereby protecting the normal operation of the precision electrical equipment around the engine.

[0026] The embodiments in the specification are described in a progressive manner, and each embodiment focuses on the difference from other embodiments. The same or similar parts between the embodiments can be referred to each other. For the device disclosed in the embodiments, since it corresponds to the method disclosed in the embodiments, the description is relatively simple, and the related parts can be referred to the method part.

[0027] The above description of the disclosed embodiments enables a person skilled in the art to implement or use the application. Various modifications to the embodiments will be apparent to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the application. Therefore, the application will not be limited to the embodiments shown herein, but will conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A ground-suspended combustion chamber igniter, characterized by, The locking electrode, the high-voltage end, the first shell, the first ceramic, the second ceramic, the second shell and the third ceramic are included, the locking electrode is in threaded connection with the high-voltage end; the first shell is located at the periphery of the locking electrode and the high-voltage end; the first ceramic is located between the locking electrode and the first shell, and the first ceramic is sealed with the first shell; the second ceramic is located between the high-voltage end and the first shell; the second shell is located at the periphery of the first shell, and the two ends of the second shell are in threaded connection with the combustion chamber and the ignition cable respectively; the third ceramic is located between the first shell and the second shell, and the third ceramic is sealed with the first shell and the second shell respectively.

2. A ground suspended combustor igniter as in claim 1, wherein, The first connecting ring, the first connecting bushing and the second connecting bushing are further included, the first connecting ring is located between the first ceramic and the first shell, and the first connecting ring is welded with the first shell; the first connecting bushing is located between the first shell and the third ceramic, and the first connecting bushing is welded with the first shell; the second connecting bushing is welded at the end of the first shell close to the first connecting bushing.

3. A ground suspended combustor igniter as in claim 2, wherein, The second connecting ring and the third connecting bushing are further included, the second connecting ring is located between the third ceramic and the second shell, and the second connecting ring is welded with the second shell; the third connecting bushing is welded at the end of the second shell close to the second connecting ring.

4. A ground suspended combustor igniter as in claim 1, wherein, The locking electrode and the high-voltage end are both in the form of a boss structure; the outer thread cylinder at the bottom of the locking electrode is in threaded connection with the threaded hole at the top of the high-voltage end.

5. A ground suspended combustor igniter as in claim 2, wherein, The first shell, the first connecting ring, the first connecting bushing and the second connecting bushing are of the same material, and are all of metal material.

6. A ground suspended combustor igniter as in claim 1, wherein, The second shell is of high-temperature-resistant alloy steel material.

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