CN112490853A

CN112490853A - Ignition electric nozzle of engine

Info

Publication number: CN112490853A
Application number: CN202011363369.0A
Authority: CN
Inventors: 洪瑞武; 陈钢锋; 张宁
Original assignee: Shaanxi Aero Electric Co Ltd
Current assignee: Shaanxi Aero Electric Co Ltd
Priority date: 2020-11-27
Filing date: 2020-11-27
Publication date: 2021-03-12

Abstract

The utility model belongs to the technical field of the engine ignition, in particular to engine ignition electric nozzle, include stiff end and the end of discharging (42) that set up along the axial, the stiff end passes through external screw thread (41) to be fixed on engine mount pad (1), and end of discharging (42) press from both sides tightly on heat shield (3) through floating ring (2), for the outer duct of engine between heat shield (3) and engine mount pad (1), discharge end (42) and pass behind heat shield (3), stretch into the engine combustion chamber, be provided with on the metal casing of end of discharging (42) and draw air groove (43), the one end that draws air groove (43) is located in the outer duct of engine, the other end is located in the engine combustion chamber. The application provides an engine ignition electric nozzle realizes the terminal cooling of electric nozzle through the bleed groove, has satisfied the operation requirement of working under the combustion chamber high temperature, has avoided the metal ablation to lead to the trouble of product inefficacy.

Description

Ignition electric nozzle of engine

Technical Field

The application belongs to the technical field of engine ignition, and particularly relates to an engine ignition electric nozzle.

Background

The ignition electric nozzle is a product which converts high-voltage electric energy into electric spark to ignite oil-gas mixed gas in a combustion chamber of an engine.

As shown in the prior art in figure 1, an ignition nozzle 4 is connected and installed on an engine mounting seat 1 through a thread 41, and a discharge end 42 of the ignition nozzle is clamped by a floating ring 2 on a heat shield 3 of an engine combustion chamber, so that the discharge end of the ignition nozzle is prevented from swinging. An engine outer duct is arranged between the engine mounting seat 1 and the heat shield 3, gas in the flow channel is gas which is branched from a compressor box of the engine, the temperature is 400-600 ℃, and the flow speed is about 120 m/s.

The thrust of a certain commercial engine reaches 13-16 tons, and compared with the existing engine (the thrust is 4-6 tons), the combustion chamber of the engine has higher use temperature. The ignition electric nozzle generates electric spark to ignite the oil-gas mixture in the combustion chamber of the engine, and the service temperature of the discharge end reaches 1100 ℃ for a long time and reaches 1350-1500 ℃ for a short time.

The existing metal material and electric nozzle structure can not meet the requirements of the use environment of an engine, so that part of the metal material of the discharge end 42 of the ignition electric nozzle in a combustion chamber of the engine is ablated and melted at high temperature for a short time, and the function of the ignition electric nozzle is lost.

Disclosure of Invention

In order to solve the technical problem, the application provides an engine ignition electric nozzle, include stiff end and the end of discharging that sets up along the axial, the stiff end passes through the external screw thread to be fixed on the engine mount pad, and the end of discharging presss from both sides tightly on the heat shield through the floating ring, is the outer duct of engine between heat shield and the engine mount pad, and the end of discharging passes behind the heat shield, stretches into the engine combustion chamber, is provided with the air guide groove on the metal casing of the end of discharging of the engine ignition electric nozzle of this application, the one end in air guide groove is located in the outer duct of engine, the other end is located in the engine combustion chamber.

Preferably, the air guide groove is a strip-shaped groove arranged along the axial direction of the engine ignition nozzle.

Preferably, the gas introduction groove is provided in plurality, arranged along a circumferential direction of the metal housing of the discharge end.

Preferably, 10 to 20 bleed air grooves are provided.

Preferably, there are 14 bleed air slots.

Preferably, the bleed air slot dimensions are 15mm long by 1.4mm wide by 1mm deep.

Preferably, the part of the air guide groove extending into the combustion chamber of the engine is of an open structure.

Because the pressure of the low-temperature gas in the outer duct is greater than the pressure in the engine combustion chamber, when the ignition nozzle works, the low-temperature gas in the outer duct reaches the discharge end head of the ignition nozzle through the gas guiding groove, and the effect of reducing the temperature of the discharge end head is achieved.

The ignition electric nozzle of a commercial engine developed according to the invention meets the use requirement of working at high temperature in a combustion chamber by using the discharge end cooling structure of the invention, and avoids the failure of products caused by metal ablation.

Drawings

Fig. 1 is a schematic structural view of a conventional engine ignition nozzle.

Fig. 2 is a schematic structural diagram of a discharge end of an engine ignition nozzle provided by the application.

FIG. 3 is a schematic view of section A-A of the embodiment of FIG. 2 of the present application.

The device comprises an engine mounting seat, a floating ring, a heat shield, an ignition electric nozzle, an external thread, a discharge end, a bleed air groove, an insulator and a center electrode, wherein the engine mounting seat is 1, the floating ring is 2, the heat shield is 3, the ignition electric nozzle is 4, the external thread is 41, the discharge end is 42, the bleed air groove is 43, the insulator is 44, and the.

For the purpose of better illustrating the embodiments, certain features of the drawings may be omitted, enlarged or reduced, and do not represent the size of an actual product; further, the drawings are for illustrative purposes, and terms describing positional relationships are limited to illustrative illustrations only and are not to be construed as limiting the patent.

Detailed Description

In order to make the implementation objects, technical solutions and advantages of the present application clearer, the technical solutions in the embodiments of the present application will be described in more detail below with reference to the accompanying drawings in the embodiments of the present application. In the drawings, the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The described embodiments are some, but not all embodiments of the present application. The embodiments described below with reference to the drawings are exemplary and intended to be used for explaining the present application, and should not be construed as limiting the present application.

Further, it is noted that, unless expressly stated or limited otherwise, the terms "mounted," "connected," and the like are used in the description of the invention in a generic sense, e.g., connected as either a fixed connection or a removable connection or integrally connected; can be mechanically or electrically connected; they may be directly connected or indirectly connected through an intermediate medium, or they may be connected through the inside of two elements, and those skilled in the art can understand their specific meaning in this application according to the specific situation.

The use temperature of the existing metal material can not reach 1350-1500 ℃. The invention aims to solve the problems that the prior art can not meet the requirements of the commercial engine on the use environment and the discharge end of an ignition nozzle is ablated.

As shown in fig. 1 to 3, the application provides an engine ignition electric nozzle, ignition electric nozzle 1 includes along the stiff end and the end 42 of discharging of axial setting, the stiff end passes through external screw thread 41 to be fixed on engine mount pad 1, and the end 42 of discharging presss from both sides tightly on heat-shield 3 through floating ring 2, is the outer duct of engine between heat-shield 3 and the engine mount pad 1, and the end 42 of discharging passes behind the heat-shield 3, stretches into the engine combustion chamber, its characterized in that, be provided with on the metal casing of end 42 of discharging and draw gas groove 43, the one end that draws gas groove 43 is located in the outer duct of engine, the other end is located in the engine combustion chamber.

In addition, as shown in fig. 3, the ignition nozzle of the engine sequentially comprises a central electrode 45, an insulator 44 and a metal shell from inside to outside along the radial direction, and the idea of the invention is to process an air guide groove 43 on the metal shell of the discharge end 42 of the ignition nozzle 4, introduce relatively low-temperature gas in an outer duct to the discharge end of the ignition nozzle, reduce the local temperature of the metal shell of the discharge end, and achieve the purpose of avoiding the ablation of the metal shell of the discharge end.

The ignition electric nozzle developed according to the invention is improved in the structure of the discharge end according to the figure 2, when the floating ring 2 of the engine clamps the metal shell of the discharge end 42 of the ignition electric nozzle, the upper part of the air-entraining groove is exposed in the outer duct, and the lower part of the air-entraining groove is connected with the combustion chamber of the engine. Because the low-temperature gas pressure of the outer duct is greater than the pressure in the engine combustion chamber, when the ignition nozzle works, the low-temperature gas of the outer duct reaches the discharge end part of the ignition nozzle through the gas guiding groove, the effect of reducing the temperature of the discharge end part is achieved, the use environment requirement of a product is met, and the performance is reliable and stable.

In some alternative embodiments, the air-guiding groove 43 is a strip-shaped groove arranged along the axial direction of the engine ignition nozzle.

In some alternative embodiments, the air guide grooves 43 are provided in plurality, and are arranged along the circumferential direction of the metal shell of the discharge end 42.

In some alternative embodiments, there are 10-20 air guide grooves 43 along the circumference of the metal shell.

In some alternative embodiments, there are 14 bleed slots 43.

In some alternative embodiments, the air entrainment channel 43 measures 15mm long by 1.4mm wide by 1mm deep. It should be understood that the size and number of bleed slots may be adjusted depending on the desired profile of the engine structure and ignition nozzle.

In some alternative embodiments, the portion of the air-guiding groove 43 extending into the engine combustion chamber is an open structure. It should be noted that the air guiding groove 43 may be open or closed, and it is specifically required to define the flow direction of the portion of the air flow entering the combustion chamber of the engine in order to prevent the bypass air flow from affecting the flow field in the combustion chamber due to the slot, for example, the air guiding groove 43 may be open so that the air flow flows along the axial direction of the engine ignition nozzle, or closed so that the air flow enters the combustion chamber of the engine and then changes from axial flow to radial flow, or the end of the air guiding groove 43 may be set to a curved flow direction, that is, the axial air guiding groove is transited to the air guiding groove arranged along the circumferential direction of the engine ignition nozzle.

Having thus described the present application in connection with the preferred embodiments illustrated in the accompanying drawings, it will be understood by those skilled in the art that the scope of the present application is not limited to those specific embodiments, and that equivalent modifications or substitutions of related technical features may be made by those skilled in the art without departing from the principle of the present application, and those modifications or substitutions will fall within the scope of the present application.

Claims

1. The utility model provides an engine ignition electric nozzle, includes along axial setting's stiff end and discharge end (42), the stiff end passes through external screw thread (41) to be fixed on engine mount pad (1), and discharge end (42) press from both sides tightly on heat-shield (3) through floating ring (2), for the outer duct of engine between heat-shield (3) and engine mount pad (1), discharge end (42) pass heat-shield (3) back, stretch into the engine combustion chamber, a serial communication port, be provided with on the metal casing of discharge end (42) and draw air groove (43), the one end that draws air groove (43) is located in the outer duct of engine, the other end is located in the engine combustion chamber.

2. The engine ignition nozzle as defined in claim 1, wherein: the air guide groove (43) is a strip-shaped groove which is axially arranged along the ignition electric nozzle of the engine.

3. The engine ignition nozzle as defined in claim 1, wherein: the gas guide grooves (43) are provided in plurality and arranged along the circumferential direction of the metal shell of the discharge end (42).

4. The engine ignition nozzle of claim 3, wherein: the number of the gas guide grooves (43) is 10-20.

5. The engine ignition nozzle as defined in claim 1, wherein: 14 air guide grooves (43) are arranged.

6. The engine ignition nozzle as defined in claim 1, wherein: the size of the air guide groove (43) is 15mm in length, 1.4mm in width and 1mm in depth.

7. The engine ignition nozzle as defined in claim 1, wherein: the part of the gas guide groove (43) extending into the engine combustion chamber is of an open structure.