JPH0628232U - Gas turbine engine ignition system - Google Patents

Abstract

(57) [Summary] [Purpose] The gap between the plug hole formed in the combustor inner cylinder and the glow plug is made small to reduce the leakage flow rate into the combustor inner cylinder. [Structure] The glow plug 1 is movably assembled to a support portion 4 of a cylindrical support member 3 that supports a combustor inner cylinder 2. A spring 5 for biasing the glow plug 1 in the backward direction is enclosed between the glow plug 1 and the support member 3, and after ignition, the glow plug tip 1a is attached to the inner wall surface 2 of the combustor cylinder.
Move the glow plug backward until it reaches the a position. Extruding member 8
Is supported by the combustion outer cylinder, and is driven by a drive device (not shown) at the time of ignition to push the glow plug 1 into the combustor inner cylinder 2.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to an ignition device for a gas turbine engine having a combustor composed of an inner and outer cylinders.

[0002]

[Prior art]

 As a conventional ignition device for a gas turbine engine, there is, for example, one shown in FIG. 3 (see, for example, JP-A-2-238134).

In FIG. 3, 31 is a glow plug, 32 is a combustor inner cylinder, 33 is a combustor inner cylinder support member that supports the combustor inner cylinder 32 at several places on the circumference, and 34 is a fuel injection valve, Reference numeral 35 is a combustor outer cylinder, 36 is a glow plug supporting portion, 37 is a sealing surface of the glow plug supporting portion, and 38 is a plug hole.

The glow plug 31 is movable, penetrates through the plug hole 38 at the time of ignition, and projects into the combustor inner cylinder 32. After ignition, it is not shown in the figure in order to prevent damage due to flame. The drive means retracts the tip of the glow plug 31 until it reaches a position on the inner wall surface 32a of the combustor inner cylinder 32.

[0005]

[Problems to be solved by the device]

 However, in such a conventional gas turbine engine ignition device, the position of the glow plug 31 is determined by the seal surface 37 of the glow plug support portion 36 of the combustor outer cylinder 35. The combustor inner cylinder 32 has a structure in which the relative position of the combustor outer cylinder 35 slightly fluctuates in order to avoid stress due to thermal expansion and external force during engine operation.

Therefore, the size of the plug hole 38 formed in the combustor inner cylinder 32 into which the glow plug 31 is inserted is determined by the size of the glow plug of the combustor outer cylinder 35 in order to avoid contact with the glow plug 32 during operation. It was necessary to make the size large enough to absorb the positional fluctuation relative to the sealing surface 37. Therefore, the hole diameter becomes large, gas flows into the combustor inner cylinder 32 through the gap between the plug hole 38 and the glow plug 31, disturbs combustion, and heat around the plug hole 38 of the combustor inner cylinder 32. There was a problem of increasing the stress.

The present invention has been made in view of such conventional problems, and an object thereof is to provide an ignition device for a gas turbine engine in which the amount of leakage from the plug hole is reduced.

[0008]

[Means for Solving the Problems]

 Therefore, the present invention is directed to a gas turbine engine ignition device having a combustor including inner and outer cylinders, a combustor inner cylinder having a hole formed therein, and a cylindrical support member for supporting the combustor inner cylinder. A glow plug supported by the support member, an extruding unit provided on the outer cylinder of the combustor, abutting against the glow plug during operation to project the glow plug into the inner cylinder of the combustor from the hole, and the combustor. An urging means provided on the inner cylinder for urging the glow plug so that the tip of the glow plug is located at the inner wall surface of the combustor inner cylinder when the pushing means is not operated.

[0009]

[Action]

 The protrusion of the glow plug into the inside of the combustor inner cylinder is performed by the pushing means provided in the combustor outer cylinder, and the glow plug is attached to the support member that supports the combustor inner cylinder. Therefore, the amount of movement of the glow plug with respect to the plug hole formed in the combustor inner cylinder is a detailed amount only by the difference in thermal expansion between the combustor inner cylinder and the support member. Therefore, the plug hole can be made small, and the gap between the plug hole and the glow plug can be made small.

[0010]

【Example】

 Hereinafter, the present invention will be described with reference to the drawings. FIG. 1 is a diagram showing an embodiment of the present invention.

First, the configuration will be described. Reference numeral 1 denotes a glow plug, which is movably assembled with a bayonet structure to a glow plug support portion 4 provided on a support member 3 that supports the combustor inner cylinder 2. Further, a spring 5 as a biasing means for biasing the glow plug 1 which is a glow plug post-retraction device in the backward direction is sealed between the glow plug 1 and the support member 3.

The support member 3 has a cylindrical structure that covers the entire circumference of the combustor inner cylinder 2, and the combustor inner cylinder 2 and the support member 3 each have a plug hole 6 as a hole for inserting the glow plug 1. In addition, the plug through hole 7 is formed.

Reference numeral 8 denotes an extruding member as an extruding means, which is driven by a driving device (not shown) and is supported by a combustor outer cylinder 9 together with a seal material 10. The extruding member 8 is in a state where it does not come into contact with the glow plug 1 as shown in FIG. 1 except at the time of ignition, and at the time of ignition, it is driven by a drive device (not shown) and comes into contact with the glow plug 1 to make the glow plug 1 burner. Push out into the inner cylinder 2. Reference numeral 11 is a wire for supplying electricity to the glow plug 1, and platinum having high heat resistance is used.

A fuel injection valve 12 injects fuel into the combustor inner cylinder 2.

Next, the operation will be described. When the engine is ignited, the pushing member 8 is driven by a driving device (not shown) to push the glow plug 1 inward of the combustor inner cylinder 2 and the vicinity of the tip of the glow plug 1 is exposed inside the combustor inner cylinder 2. Become. Then, the fuel is injected into the heated glow plug 1 from the fuel injection valve 12 and ignited.

After the ignition, in order to prevent the glow plug 1 from being damaged by the flame, the pushing member 8 is returned to the position before ignition by the driving device, and the spring 5 as the urging means causes the glove lug 1 to move to the position shown in FIG. The illustrated tip 1a is returned to the position of the inner wall surface 2a of the combustor inner cylinder 2.

During engine operation, the combustor inner cylinder 2 changes its position with respect to the combustor outer cylinder 9 due to thermal expansion and external force, but the glow plug 1 is supported by the support member 3 that moves together with the combustor inner cylinder 2. Therefore, the amount of movement of the glow plug 1 with respect to the plug hole 6 of the combustor inner cylinder is only the difference in thermal expansion between the combustor inner cylinder 2 and the support member 3. Therefore, the gap between the glow plug 1 and the plug hole 6 formed in the combustor inner cylinder 2 can be reduced, so that the gas flowing from the outer side to the inner side of the combustor inner cylinder 2 through the gap can be reduced. The amount will decrease.

Further, the support member 3 has a cylindrical structure, exists on the entire circumference of the combustor inner cylinder 2, and has only the hole 7 through which the glow plug 1 penetrates as an opening to the outside. Therefore, the fluid having a higher pressure than the inside of the combustor inner cylinder 2 flowing through the flow path 13 outside the supporting member 3 does not directly flow into the inside of the supporting member 3. Therefore, the flow rate into the combustor inner cylinder 2 through the gap between the glow plug 1 and the plug hole 6 is further reduced.

In this way, the leakage flow rate flowing into the combustor inner cylinder 2 through the gap between the glow plug 1 and the plug hole 6 of the combustor inner cylinder 2 is reduced, so that the combustion state becomes better. . Further, the thermal stress around the plug hole 6 of the combustor inner cylinder 2 due to the gas having a lower temperature than that in the combustor inner cylinder 2 can be reduced.

Further, since the supporting member 3 is present on the entire circumference of the combustor inner cylinder 2, radiation from the combustor inner cylinder 2 does not reach the combustor outer cylinder 9, so that It has the effect of lowering the temperature. Further, since the extruding member 8 is in contact with the glow plug 1 during engine operation, heat in the vicinity of the combustor inner cylinder 2 is not transferred to the extruding member 8 by heat conduction. Therefore, the sealing material 10 is not exposed to high temperatures.

FIG. 2 shows another embodiment of the present invention. In this embodiment, the electrode is exposed on the contact surface 14 on the glow plug 1 side and the contact surface 15 on the pushing member 8 side, and the pushing member 8 is brought into contact with the glow plug 1 at the time of ignition, so that an electric current is applied to the glow plug. The structure is such that it flows into 1.

According to this embodiment, the same effect as that of the above-described embodiment can be obtained, and since it is not necessary to wire the glow plug 1 with a wire for supplying electricity to the glow plug 1, the assembly is easy. is there.

[0023]

[Effect of device]

 As described above, according to the present invention, the gap between the glow plug and the plug hole formed in the combustor inner cylinder can be made small, so that the amount of fluid leakage from the gap can be made small. You can

Further, since the extruded member does not reach a high temperature, there is an effect that the outer cylinder of the combustor can be easily sealed.

[Brief description of drawings]

FIG. 1 is a sectional view showing an embodiment of the present invention.

FIG. 2 is a sectional view showing another embodiment of the present invention.

FIG. 3 is a cross-sectional view showing a conventional example.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Glow plug 2 ... Combustor inner cylinder 3 ... Combustor inner cylinder support member 4 ... Glow plug support portion 5 ... Spring (biasing means) 6 ... Plug hole (hole portion) 8 ... Extrusion member (extrusion means) 9 ... Combustor outer cylinder 10 ... Sealing material 11 ... Wire material 12 ... Fuel injection valve 14, 15 ... Contact surface

Claims (1)

[Scope of utility model registration request] 1. An ignition device for a gas turbine engine having a combustor consisting of an inner and outer cylinder, a combustor inner cylinder having a hole formed therein, a cylindrical support member for supporting the combustor inner cylinder, A glow plug supported by a support member, an extruding means provided on the outer cylinder of the combustor and abutting the glow plug during operation so as to project the glow plug into the inner cylinder of the combustor through the hole, An igniter for a gas turbine engine, which is provided with an urging means for urging the glow plug so that the tip of the glow plug is located at the inner wall surface of the inner cylinder of the combustor when the pushing means is not in operation. .