RAT turbine deicing device

Abstract

The invention belongs to the field of aviation emergency energy, and relates to an RAT turbine deicing device which is mainly composed of an ice scraper, a combined seal, an ice scraper rod, a fastening pin, a stop rod, an adjusting pad, a gasket, a nut, a bearing and the like. Wherein the ice scraper is located at the front end of the turbine cover and keeps a small gap with the turbine cover. The ice scraper and the ice scraper rod are fixedly connected into a whole and connected with the stop rod through the fastening pin, and the combined seal is arranged at the front end of the ice scraper rod and installed on the turbine cover. The stop rod is arranged in the turbine and supported by the two bearings, the front end bearing is installed in the shaft sleeve, the rear end bearing is installed in the turbine shaft, and the tail end of the stop rod is fixed to the gearbox rear cover through the adjusting pad, the gasket and the nut, so that it is guaranteed that the ice scraper does not rotate when the RAT turbine rotates to work. When the RAT turbine is exposed in an icing environment to work, accumulated ice at the front end of the turbine cover is directly cleared away by the ice scraper, and therefore the effect of deicing the turbine is achieved.

Description

Technical Field

[0001] This invention belongs to the field of aviation emergency energy and relates to a RAT turbine de-icing device. Background Technology

[0002] For example, in patent US5558495A, the traditional RAT turbine de-icing device is an electromagnetic eddy current anti-icing system, mainly composed of a stator, magnetic ring, magnetic blocks, and stator shaft, built into the turbine hub. It utilizes the heat from the permanent magnet eddy currents generated during turbine rotation to melt the ice adhering to the turbine components, effectively eliminating the impact of ice on RAT extraction efficiency. However, this type of anti-icing device consumes turbine extraction mechanical power regardless of whether the turbine is iced, thus reducing the RAT system's emergency energy output capability. To avoid unnecessary consumption of RAT system mechanical power by the RAT turbine de-icing device, a completely new RAT turbine de-icing device needs to be designed so that it does not consume mechanical energy when the turbine is not iced, but only operates and consumes system mechanical energy when the turbine is iced. Summary of the Invention

[0003] The purpose of this invention is to design a RAT turbine de-icing device to solve the problem of traditional RAT turbine de-icing devices consuming the mechanical energy of the RAT system when the turbine is not iced.

[0004] The technical solution of this invention is as follows: A RAT turbine de-icing device, comprising an ice scraper 1, a combined seal 2, an ice scraper rod 3, a fastening pin 4, a front bearing 5, a stop rod 6, an adjusting shim 7, a washer 8, a nut 9, and a rear bearing 10, etc.; wherein, the ice scraper 1 is located at the front end of the turbine cover 11 and maintains a small gap with the turbine cover 11. The ice scraper 1 and the ice scraper rod 3 are fixedly connected as one unit and connected to the stop rod 6 through the fastening pin 4. A combined seal 2 is provided at the front end of the ice scraper rod 3, and the combined seal 2 is installed on the turbine cover 11. The stop rod 6 is built into the turbine 14 and supported by two bearings. The front bearing 5 is installed in the bushing 12, and the rear bearing 10 is installed in the turbine shaft 15. The tail end of the stop rod 6 is fixed to the gearbox rear cover 16 through the adjusting shim 7, the washer 8, and the nut 9, thereby ensuring that the ice scraper 1 does not rotate when the RAT turbine 11 is rotating. When the RAT turbine is exposed to an icy environment, the ice accumulated at the front end of the turbine cover 11 will be directly removed by the ice scraper 1, thereby achieving the turbine de-icing function.

[0005] Furthermore, the front end of the turbine cover 11 is spherical, and the surfaces 20 and 21 of the ice scraper 1 are also spherical, with the gap between surface 20 and the spherical surface at the front end of the turbine cover 11 being approximately 0.5mm to 0.8mm. The gap is adjusted by adjusting the thickness of the shim 7.

[0006] Furthermore, the generatrices of surfaces 22 and 23 of the ice scraper 1 are involutes. The height of the involute generatrice of surface 22 is 5mm to 8mm, with 0.25 turns, a bottom radius of 26mm to 30mm, and a difference of 2mm to 3mm between the top and bottom radii. The diameter of the cylindrical surface 24 at the head of the ice scraper 1 is 8mm to 10mm.

[0007] Furthermore, the bushing 12 is designed with a shoulder and a mounting groove for the retaining ring 17. The outer ring of the front bearing 5 is installed inside the bushing 12, positioned by the shoulder, and limited by the retaining ring 17. The inner ring of the front bearing 5 is fitted onto the front end of the stop rod 6.

[0008] Furthermore, the turbine shaft 15 is designed with a shoulder and a mounting groove for the retaining ring 18. The outer ring of the rear bearing 10 is installed in the hole of the turbine shaft 15, positioned by the shoulder, and limited by the retaining ring 18. The inner ring of the rear bearing 10 is fitted onto the tail of the stop rod 6.

[0009] Furthermore, both the front bearing 5 and the rear bearing 10 are deep groove ball bearings.

[0010] Furthermore, the yoke shaft 13 and turbine shaft 15 are designed as hollow structures, with the stop rod 6 passing through the center.

[0011] Furthermore, the stop lever 6 has two flat structures 18 at its head, and a U-shaped hole 19 is designed at the center of the gearbox rear cover 16. The gearbox rear cover 16 is fixed to the RAT gearbox housing with screws. The head of the stop lever 6 is inserted into the U-shaped hole of the gearbox rear cover 16, and the gearbox rear cover 16 prevents the stop lever from rotating.

[0012] Furthermore, the head of the stop rod 6 is designed with a threaded structure, and the stop rod 6 is installed on the gearbox rear cover 16 through the nut 9, which is a self-locking nut.

[0013] Furthermore, the outer ring of the combined seal 2 is installed in the inner hole of the turbine cover 11, and the outer ring of the combined seal 2 and the inner hole of the turbine cover 11 are interference fit.

[0014] The beneficial effects of this invention are: The RAT turbine de-icing device designed in this invention does not operate when the turbine is not iced, thus consuming no mechanical energy of the RAT system; it can remove ice when the turbine is iced. The ice scraper of this anti-RAT turbine de-icing device adopts an involute shape design, which is beneficial for removing ice. The involute shape design of the ice scraper ensures that the removed ice falls along the involute, effectively preventing damage to other aircraft equipment from falling ice. This anti-RAT turbine de-icing device requires no regular maintenance in the field, saving maintenance costs. The device has a simple structure and high reliability. It is lightweight and has low manufacturing cost. The connection between each pair of components in the RAT turbine de-icing device is simple and easy to install. Attached Figure Description Figure 1 This is an overall structural diagram of the present invention; Figure 2 This is a structural diagram of the front bearing of the present invention; Figure 3 This is a structural diagram of the rear bearing of the present invention; Figure 4 This is a structural diagram of the ice scraper and ice scraper rod of the present invention; Figure 5 This is a structural diagram of the tail section of the stop rod of the present invention; Figure 6 This is a structural diagram of the gearbox rear cover of the present invention; Among them, 1-ice scraper, 2-combination seal, 3-ice scraper rod, 4-fastening pin, 5-front bearing, 6-stop rod, 7-adjusting shim, 8-washer, 9-nut, 10-rear bearing, 11-turbine cover, 12-shaft sleeve, 13-yoke shaft, 14-turbine, 15-turbine shaft, 16-gearbox rear cover, 17-retaining ring, 18-flat structure, 19-waist-shaped hole, 20-ice scraper surface, 21-ice scraper surface, 22-ice scraper surface, 23-ice scraper surface, 24-cylindrical surface of ice scraper head. Detailed Implementation

[0015] To more clearly illustrate the technical solutions of the embodiments of the present invention, the present invention will be described in detail below with reference to the accompanying drawings or specific implementation examples. It should be noted that some (but not all) of the disclosed examples are shown in the drawings. In fact, many different examples can be described, and these examples should not be construed as limited to the examples set forth herein. Rather, these examples are described to better demonstrate the positive effects of the present invention, and all aspects not detailed herein are considered to be well-known or conventional techniques in the art.

[0016] like Figure 1As shown, the RAT turbine de-icing device consists of an ice scraper 1, a combination seal 2, an ice scraper rod 3, a fastening pin 4, a front bearing 5, a stop rod 6, an adjusting shim 7, a washer 8, a nut 9, and a rear bearing 10. The ice scraper 1 is located at the front end of the turbine cover 11, maintaining a slight gap with it. The ice scraper 1 is fixedly connected to the ice scraper rod 3, and is connected to the stop rod 6 via the fastening pin 4. A combination seal 2 is located at the front end of the ice scraper rod 3, and the combination seal 2 is mounted on the turbine cover 11. The stop rod 6 is built into the turbine 14 and supported by two bearings. Figure 2 and Figure 3 As shown, the front bearing 5 is installed inside the bushing 12, and the rear bearing 10 is installed inside the turbine shaft 15. The tail end of the stop rod 6 is fixed to the gearbox rear cover 16 by adjusting shims 7, washers 8, and nuts 9, thus ensuring that the ice scraper 1 does not rotate when the RAT turbine 11 is rotating. When the RAT turbine is exposed to an icy environment, the ice accumulated at the front end of the turbine cover 11 will be directly removed by the ice scraper 1, thereby achieving turbine de-icing.

[0017] like Figure 4 As shown, the front end of the turbine cover 11 is spherical, and surfaces 20 and 21 of the ice scraper 1 are also spherical. The gap between surface 20 and the spherical surface at the front end of the turbine cover 11 is approximately 0.5mm to 0.8mm. The gap is adjusted by adjusting the thickness of the shim 7.

[0018] like Figure 4 As shown, the generatrices of surfaces 22 and 23 of the ice scraper 1 are involutes. The height of the involute generatrice of surface 22 is 5mm to 8mm, with 0.25 turns. The bottom radius is 26mm to 30mm, and the difference between the top and bottom radii is 2mm to 3mm. The diameter of the cylindrical surface 24 at the head of the ice scraper 1 is 8mm to 10mm.

[0019] like Figure 2 As shown, the bushing 12 is designed with a shoulder and a mounting groove for the retaining ring 17. The outer ring of the front bearing 5 is installed inside the bushing 12, positioned by the shoulder, and limited by the retaining ring 17. The inner ring of the front bearing 5 is fitted onto the front end of the stop rod 6.

[0020] like Figure 3 As shown, the turbine shaft 15 is designed with a shoulder and a mounting groove for the retaining ring 18. The outer ring of the rear bearing 10 is installed in the hole of the turbine shaft 15, positioned by the shoulder, and limited by the retaining ring 18. The inner ring of the rear bearing 10 is fitted onto the tail of the stop rod 6.

[0021] like Figure 2 and Figure 3 As shown, both the front bearing 5 and the rear bearing 10 are deep groove ball bearings.

[0022] like Figure 1 As shown, the yoke shaft 13 and turbine shaft 15 are designed as hollow structures, and the stop rod 6 passes through the center.

[0023] like Figure 5 and Figure 6 As shown, the stop rod 6 has two flat structures 18 at its head, and a U-shaped hole 19 is designed at the center of the gearbox rear cover 16. The gearbox rear cover 16 is fixed to the RAT gearbox housing with screws. The head of the stop rod 6 is inserted into the U-shaped hole of the gearbox rear cover 16, and the gearbox rear cover 16 prevents the stop rod from rotating.

[0024] like Figure 5 As shown, the head of the stop rod 6 is designed with a threaded structure, and the stop rod 6 is installed on the gearbox rear cover 16 by means of nut 9. Nut 9 is a self-locking nut.

[0025] like Figure 1 As shown, the outer ring of the combined seal 2 is installed in the inner hole of the turbine cover 11, and the outer ring of the combined seal 2 and the inner hole of the turbine cover 11 are interference fit.

[0026] The above specific embodiments or examples are only used to explain the technical solutions of the present invention and are not intended to limit the present application. Parts not described in detail are considered to be conventional technical means or common knowledge in the field. It can be understood by those skilled in the art that, based on the design concept of the present application, the technical solutions described in the foregoing embodiments can be adapted or some or all of the technical features can be equivalently replaced. These modifications, equivalent replacements, and adaptive improvements do not depart from the technical essence of the present invention and should all be covered within the protection scope of the present application.

Claims

1. A RAT turbine de-icing device, characterized in that... It consists of an ice scraper (1), a combination seal (2), an ice scraper rod (3), a fastening pin (4), a front bearing (5), a stop rod (6), an adjusting shim (7), a washer (8), a nut (9), and a rear bearing (10). The ice scraper (1) is located at the front end of the turbine cover (11) and maintains a small gap with the turbine cover (11). The ice scraper (1) and the ice scraper rod (3) are fixed together and connected to the stop rod (6) through the fastening pin (4). A combination seal (2) is provided at the front end of the ice scraper rod (3) and is installed on the turbine cover (11). The stop rod (6) is built into the turbine (14) and supported by two bearings. The front bearing (5) is installed in the bushing (12) and the rear bearing (10) is installed in the turbine shaft 15. The tail end of the stop rod (6) is fixed to the gearbox rear cover (16) by the adjusting pad (7), washer (8) and nut (9), so as to ensure that the ice scraper (1) does not rotate when the RAT turbine (11) is rotating. When the RAT turbine is exposed to the icing environment, the ice accumulation at the front end of the turbine cover (11) will be directly removed by the ice scraper (1), thus playing the role of turbine de-icing.

2. The RAT turbine de-icing device according to claim 1, characterized in that... The front end of the turbine cover (11) is spherical, and the surfaces (20) and (21) of the ice scraper (1) are spherical. The gap between the surface (20) and the spherical surface at the front end of the turbine cover (11) is about 0.5mm to 0.8mm.

3. The RAT turbine de-icing device according to claim 2, characterized in that... The generatrices of the surfaces (22) and (23) of the ice scraper (1) are involutes. The height of the involute generatrices of surface (22) is 5mm to 8mm, 0.25 turns, the bottom radius is 26mm to 30mm, and the difference between the top radius and the bottom radius is 2mm to 3mm. The diameter of the cylindrical surface (24) of the head of the ice scraper (1) is 8mm to 10mm.

4. The RAT turbine de-icing device according to claim 1, characterized in that... The bushing (12) is designed with a shoulder and a mounting groove for a retaining ring (17). The outer ring of the front bearing (5) is installed inside the bushing (12), positioned by the shoulder, and limited by the retaining ring (17). The inner ring of the front bearing (5) is fitted on the front end of the stop rod (6).

5. The RAT turbine de-icing device according to claim 1, characterized in that... The turbine shaft (15) is designed with a shoulder and a mounting groove for a retaining ring (18). The outer ring of the rear bearing (10) is installed in the hole of the turbine shaft (15), positioned by the shoulder and limited by the retaining ring (18). The inner ring of the rear bearing (10) is fitted onto the tail of the stop rod (6).

6. The RAT turbine de-icing device according to claim 1, characterized in that... Both the front bearing (5) and the rear bearing (10) are deep groove ball bearings.

7. The RAT turbine de-icing device according to claim 1, characterized in that... The yoke shaft (13) and turbine shaft (15) are designed as hollow structures, and the stop rod (6) passes through the center.

8. The RAT turbine de-icing device according to claim 1, characterized in that... The stop rod (6) has two planar structures at its head, and a U-shaped hole is designed at the center of the gearbox rear cover (16). The gearbox rear cover (16) is fixed to the RAT gearbox housing with screws; the head of the stop rod (6) is inserted into the U-shaped hole of the gearbox rear cover (16), and the gearbox rear cover (16) prevents the stop rod from rotating.

9. The RAT turbine de-icing device according to claim 1, characterized in that... The head of the stop rod (6) is designed with a threaded structure. The stop rod (6) is installed on the gearbox rear cover (16) by means of the nut (9). The nut (9) is a self-locking nut.

10. The RAT turbine de-icing device according to claim 1, characterized in that... The outer ring of the combined seal (2) is installed in the inner hole of the turbine cover (11), and the outer ring of the combined seal (2) and the inner hole of the turbine cover (11) are interference fit.

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