Mounting seal structure, gas turbine engine, and method for measuring exhaust gas temperature

Abstract

The invention relates to an installation sealing structure of an exhaust gas temperature sensor, a gas turbine engine and an exhaust gas temperature measuring method. The mounting and sealing structure comprises a casing piece, a sealing piece and a sealing piece, wherein the casing piece comprises a casing mounting seat, an inner sleeve, an inner casing boss and a positioning piece; the cartridge receiver mounting seat and the inner cartridge receiver boss are of hollow structures, the inner sleeve is of a hollow columnar structure with the head and the tail being spherical, and an inner sleeve bulb is in tolerance fit with the inner wall of the cartridge receiver mounting seat and the inner wall of the inner cartridge receiver boss; the positioning piece is matched with the mounting seat to ensure that the bottom of the inner sleeve is tightly attached to the bottom of the boss; and the inner sleeve is in clearance fit with the sensor shell.

Description

Technical Field

[0001] The invention relates to a mounting sealing structure of an exhaust gas temperature sensor, a gas turbine engine, and a method for measuring exhaust gas temperature. Background Art

[0002] The exhaust temperature sensor is an important source for obtaining aircraft engine control parameters. The exhaust temperature sensor is mostly installed on the turbine casing. The turbine casing is located at the rear end of the combustion chamber and has complex working conditions, so its structural design is often more complicated. It is mostly a double-layer structure with cooling air in the middle.

[0003] The exhaust temperature sensor needs to pass through the inner and outer layers of the casing and penetrate into the mainstream to measure the temperature. At the same time, the inner casing interface must be sealed to prevent the cooling air from leaking into the mainstream and affecting the measurement.

[0004] Currently, there are two main types of sensor installation sealing structures. One is achieved through a plug and a spring design for compression, and the other is a sealing plug structure with a nut that is sealed to the inner casing.

[0005] Both solutions use the sealing structure of the sensor itself to achieve sealing with the inner casing interface, which places high demands on the installation and reliability of the sensor. The relatively complex structure leads to complex processing technology and increased processing costs. In actual operation, the cooling air blows directly onto the sensor temperature measuring rod, affecting the sensor's measurement accuracy. Summary of the invention

[0006] An object of the present invention is to provide a mounting seal structure for an exhaust gas temperature sensor.

[0007] An object of the present invention is to provide a gas turbine engine.

[0008] An object of the present invention is to provide a method for measuring exhaust gas temperature.

[0009] According to one aspect of the present invention, a mounting sealing structure for an exhaust temperature sensor comprises: a casing component, including a casing mounting seat, an inner sleeve, an inner casing boss, and a positioning member; the casing mounting seat and the inner casing boss are hollow structures, the inner sleeve is a hollow cylindrical structure with spherical ends, and the ball head of the inner sleeve and the inner wall of the casing mounting seat and the inner wall of the inner casing boss are matched with tolerances; the positioning member ensures that the bottom of the inner sleeve is tightly attached to the bottom of the boss by matching with the mounting seat; and the sensor, the inner sleeve and the sensor housing are clearance matched.

[0010] In some embodiments, the inner sleeve and the sensor housing are clearance-fitted, and the clearance is larger than the clearance between the ball head and the inner wall.

[0011] In some embodiments, the clearance between the inner sleeve and the sensor housing is 0.5 mm-1 mm.

[0012] In some embodiments, the sensor includes a straight rod probe, including a hot electrode and a shell. When installed, the sensor enters the inner sleeve through the mounting seat and then extends into the inner sleeve.

[0013] In some embodiments, the housing of the sensor includes a plurality of air inlets, a single air outlet, and a cavity formed inside the housing, constituting a stagnation cavity.

[0014] In some embodiments, the plurality of air inlets include a first air inlet, and air flows from the first air inlet through the hot electrode and the stagnation effect of the upper wall and the right side wall of the stagnation cavity on the hot electrode.

[0015] In some embodiments, the plurality of air inlets include a second air inlet, and the airflow entering from the second air inlet acts on the hot electrode through the stagnation of the lower wall and the right side wall of the stagnation cavity.

[0016] In some embodiments, the sensor is an exhaust temperature sensor.

[0017] A gas turbine engine according to one aspect of the present invention comprises the above-described mounting seal structure.

[0018] According to an aspect of the present invention, a method for measuring exhaust gas temperature adopts the above-described mounting sealing structure.

[0019] The improved effects of this application include but are not limited to one or a combination of the following:

[0020] 1. High measurement accuracy of the sensor: The inner sleeve, outer casing mounting seat, inner casing boss and exhaust temperature sensor are designed so that the cooling air does not affect the mainstream and does not act on the sensor temperature measuring rod, ensuring that the sensor temperature measurement is not affected by the cooling air; at the same time, the sensor stagnation cavity design makes the sensor inlet airflow range large, the response to the airflow and the stagnation effect are good, which can reflect the real total temperature of the airflow, thereby improving the sensor measurement accuracy.

[0021] 2. Simple installation: The sensor is guided by the inner sleeve, which avoids the collision and friction between the sensor probe and the inner casing due to the invisible interface of the inner casing during installation. The installation method is simple and easy to operate.

[0022] 3. Simple structure: The sensor installation sealing structure is designed on the casing, which is a simple blocking design. The sensor only realizes the outer casing fastening and temperature measurement functions. It has a simple structure and is easy to process, manufacture and control costs.

[0023] 4. High reliability of the sensor: The sensor has a simple structure, and during normal operation, the sensor probe has no direct interaction with the inner casing and is only connected to the sensor mounting base, which improves the reliability of the sensor probe. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] The above and other features, properties and advantages of the present invention will become more apparent through the following description in conjunction with the accompanying drawings and embodiments. It should be noted that the drawings are only examples and are not drawn to scale, and should not be used as a limitation on the actual scope of protection required by the present invention, wherein:

[0025] Figure 1 The figure is a schematic diagram of the installation and sealing structure of an exhaust temperature sensor according to an embodiment.

[0026] Figure 2 The figure is a schematic diagram of a cross-sectional view of a mounting sealing structure of an exhaust temperature sensor according to an embodiment. DETAILED DESCRIPTION

[0027] The following discloses various different implementation methods or embodiments of the subject technical solution. To simplify the disclosure, specific examples of various elements and arrangements are described below. Of course, these are only examples and are not intended to limit the scope of protection of the present invention.

[0028] In addition, the use of "one embodiment", "an embodiment", and / or "some embodiments" means a certain feature, structure or characteristic related to at least one embodiment of the present application. Therefore, it should be emphasized and noted that "one embodiment" or "one embodiment" or "one or more embodiments" mentioned twice or more in different places in this specification do not necessarily refer to the same embodiment. In addition, certain features, structures or characteristics in one or more embodiments of the present application can be appropriately combined.

[0029] The sensor installation sealing structure introduced in the following embodiment is applied to a gas turbine engine, taking a turbofan engine as an example, to measure the exhaust temperature, but is not limited to this. For example, it can also be a marine gas turbine engine, a ground gas turbine, etc. As long as the exhaust temperature needs to be measured, the sensor in this case can be applied.

[0030] As described above, the inventors have found that the existing exhaust temperature sensor sealing structure has the following defects:

[0031] 1. The influence of cooling gas on the measurement accuracy of the sensor cannot be avoided;

[0032] 2. The installation is complicated. The inner receiver interface is not visible during installation, and it is impossible to avoid friction with the inner receiver during installation;

[0033] 3. Adding more components to the sensor reduces the reliability of the sensor;

[0034] 4. The structural design and processing technology are relatively complicated.

[0035] Based on the above, the inventor of this case invented a new sensor sealing structure to overcome the above problems.

[0036] refer to Figure 1 as well as Figure 2 As shown, the exhaust temperature sensor installation sealing structure includes a casing part and a sensor. The casing part includes an outer casing mounting seat 1, an inner sleeve 2, and an inner casing boss 3. The sensor takes an exhaust temperature sensor 4 as an example.

[0037] Continue to refer Figure 1 as well as Figure 2 As shown, the receiver component includes an outer receiver mounting seat 1, an inner sleeve 2, an inner receiver boss 3, and a positioning member. In the following description, the positioning member takes a positioning pin 5 as an example, but this is not a limitation.

[0038] The outer casing mounting seat 1 and the inner casing boss 3 are designed as hollow structures, so as to realize the installation of the sensor 4, the positioning pin 5, and the inner sleeve ball head 6, 9.

[0039] The inner sleeve 2 is designed as a hollow cylindrical structure with spherical ends. The ball heads 6 and 9 of the inner sleeve are matched with the inner walls of the mounting seat 1 and the inner walls of the boss 3 by tolerance, so that the inner wall and the widest part of the ball head fit together to achieve partial sealing of the cooling gas. The inner sleeve 2 and the sensor housing 8 are matched with a clearance. Preferably, in some embodiments, the inner sleeve 2 and the sensor housing 8 are matched with a clearance, which is generally set to a clearance slightly larger than the clearance between the ball head and the inner wall for easy installation. Preferably, in some embodiments, for example, it can be between 0.5mm-1mm, so as to ensure that less mainstream hot air enters the gap, thereby reducing the temperature resistance requirements on the sensor cable end.

[0040] The locating pin 5 cooperates with the mounting seat 1 to ensure that the bottom of the inner sleeve 6 and the bottom of the boss 10 are in close contact with each other, thereby achieving the sealing of the cooling gas. Generally speaking, considering the sealing effect, the processing requirements for the bottom of the inner sleeve 6 and the bottom of the boss 10 can be that the surface roughness and flatness requirements of the bottom of the sleeve 6 and the bottom of the boss 10 are consistent.

[0041] The beneficial effects of the above embodiments include but are not limited to: through the structural design of the outer casing mounting base 1, the inner sleeve 2, the inner casing boss 3, the positioning pin 5, and the matching relationship with the sensor, the cooling gas does not affect the mainstream and does not act on the sensor temperature measuring rod, thereby ensuring that the sensor temperature measurement is not affected by the cooling gas; and the inner sleeve and the sensor housing are a clearance-matched structure, so that the sensor housing can be guided by the inner sleeve during installation, avoiding the collision and friction between the sensor probe and the inner casing caused by the invisible inner casing interface during installation, and the installation method is simple and easy to operate.

[0042] It can be understood that the above embodiments simultaneously achieve the advantages of improving sensing accuracy and improving assembly convenience.

[0043] Continue to refer Figure 1 as well as Figure 2 As shown, in some embodiments, the structure of the temperature sensor 4 can be a straight rod probe. When installed, the sensor 4 enters the inner sleeve 2 through the casing mounting seat 1 and then extends into it, so as to be used in conjunction with the casing sealing structure. As shown in the figure, the sensor 4 can include a thermode 7, and outer shells 8 and 11.

[0044] In some embodiments, the specific structure of the thermode 7 can generally be composed of a pair of wires, a stainless steel shell and internal fillers to ensure the reliability of the thermode.

[0045] In some embodiments, the housing can be designed as a split body, and the reliable connection of the housing is achieved through the interference fit between the housing 8 and the housing 11. The housing of the sensor 4 includes multiple air inlets, a single air outlet, and a cavity formed inside the housing, forming a stagnation cavity. Specifically, the stagnation cavity 12 formed by the housing 11 is formed by three air inlets 14, 15, and 16, and one air outlet 13 and a cavity formed inside. It can be understood that the number of air inlets is not limited to the three described above, and can be adjusted according to actual needs.

[0046] The sensor stagnation cavity design makes the sensor inlet airflow range large, and the response and stagnation effect of the airflow are good, which can reflect the true total temperature of the airflow, thereby improving the measurement accuracy of the sensor. The specific principles are as follows:

[0047] When the sensor is in the working environment, the mainstream gas enters from the air inlets 14, 15, and 16 and flows out from the air outlet 13. The airflows from the three air inlets act on the hot electrode after different stagnation effects. The airflow entering from the air inlet 14 acts on the hot electrode through the stagnation of the hot electrode and the upper and right walls of the stagnation cavity. The airflow entering from the air inlet 15 flows through the hot electrode and flows out from the air outlet, and the stagnation effect is not obvious. The airflow entering from the air inlet 16 acts on the hot electrode through the stagnation of the lower wall and the right wall of the stagnation cavity. The design of the air inlet of the stagnation cavity allows a larger range of mainstream airflow to enter the sensor, so that the sensor can represent the average temperature of the cross section of the sensor probe. The stagnation of the airflow inside the stagnation cavity is complex, including both flows with insignificant stagnation effects and flows with better stagnation effects, so that the dynamic response delay of the sensor can be short and the total temperature recovery rate can be high.

[0048] As described above, the present application also provides a method for measuring exhaust temperature, which adopts the above-mentioned exhaust temperature sensor installation sealing structure set in the turbine casing of the gas turbine engine, so as to achieve one or a combination of the advantages of high sensor measurement accuracy, simple installation, simple structure and high sensor reliability.

[0049] In summary, the beneficial effects of the installation seal structure, gas turbine engine, and exhaust temperature measurement method described in the above embodiments include but are not limited to one or a combination of the following:

[0050] 1. High sensor measurement accuracy: The inner sleeve, outer casing mounting seat, inner casing boss and exhaust temperature sensor design proposed in this patent ensure that the cooling air does not affect the mainstream and does not act on the sensor temperature measuring rod, ensuring that the sensor temperature measurement is not affected by the cooling air; at the same time, the sensor stagnation cavity design enables the sensor inlet airflow range to be large, and the response and stagnation effect to the airflow are good, which can reflect the true total temperature of the airflow, thereby improving the sensor measurement accuracy.

[0051] 2. Simple installation: This patented sensor is guided by the inner sleeve, which avoids the collision and friction between the sensor probe and the inner casing caused by the invisible interface of the inner casing during installation. The installation method is simple and easy to operate.

[0052] 3. Simple structure: The sensor installation sealing structure is designed on the casing, which is a simple blocking design. The sensor only realizes the outer casing fastening and temperature measurement functions. It has a simple structure and is easy to process, manufacture and control costs.

[0053] 4. High reliability of the sensor: The sensor has a simple structure, and during normal operation, the sensor probe has no direct interaction with the inner casing and is only connected to the sensor mounting base, which improves the reliability of the sensor probe.

[0054] Although the present invention is disclosed as above with the above embodiments, it is not intended to limit the present invention. Any person skilled in the art may make possible changes and modifications without departing from the spirit and scope of the present invention. Therefore, any modification, equivalent change and modification made to the above embodiments according to the technical essence of the present invention without departing from the content of the technical solution of the present invention shall fall within the protection scope defined by the claims of the present invention.

Claims

1. A sensor installation sealing structure, characterized in that: include: The casing part comprises a casing mounting seat, an inner sleeve, an inner casing boss, and a positioning member; the casing mounting seat and the inner casing boss are hollow structures, the inner sleeve is a hollow columnar structure with spherical ends, and the ball head of the inner sleeve is matched with the inner wall of the casing mounting seat and the inner wall of the inner casing boss by tolerance; the positioning member is matched with the mounting seat so that the bottom of the inner sleeve is closely attached to the bottom of the boss; The sensor, the inner sleeve and the sensor housing are clearance-matched.

2. The installation sealing structure according to claim 1, characterized in that: The inner sleeve and the sensor housing are clearance matched, and the clearance is larger than the clearance between the ball head and the inner wall.

3. The installation sealing structure according to claim 1, characterized in that: The clearance between the inner sleeve and the sensor housing is 0.5 mm to 1 mm.

4. The installation sealing structure according to claim 1, characterized in that: The sensor comprises a straight rod type probe, a hot electrode and a shell. When installed, the sensor enters the inner sleeve through the mounting seat and then extends into the inner sleeve.

5. The installation sealing structure according to claim 4, characterized in that: The housing of the sensor comprises a plurality of air inlets, a single air outlet and a cavity formed inside the housing, forming a stagnation cavity.

6. The mounting sealing structure according to claim 5, characterized in that: The multiple air inlets include a first air inlet, and the air flows from the first air inlet through the hot electrode and the stagnation effect of the upper wall and the right side wall of the stagnation cavity on the hot electrode.

7. The installation sealing structure according to claim 5, characterized in that: The multiple air inlets include a second air inlet, and the airflow entering from the second air inlet acts on the hot electrode through the stagnation of the lower wall surface and the right side wall of the stagnation cavity.

8. The mounting sealing structure according to claim 1, characterized in that: The sensor is an exhaust temperature sensor.

9. A gas turbine engine, characterized in that: It comprises a sensor mounting sealing structure as described in any one of claims 1-8.

10. The gas turbine engine according to claim 9, characterized in that The sensor is disposed in a turbine casing of the gas turbine engine.

11. A method for measuring exhaust temperature, characterized in that: Used in a gas turbine engine, the sensor installation sealing structure according to any one of claims 1 to 8 is adopted.

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