Low-false-alarm-rate differential pressure type icing annunciator shell

Abstract

The invention belongs to the technical field of ice prevention and removal, and relates to a differential pressure type icing annunciator shell with a low false alarm rate. A differential pressure type icing annunciator receiving shell and a standard shell are large in surface air hole diameter tolerance range, and false alarms are prone to occurring in the actual using process. The device comprises a receiving shell and a standard shell, the receiving shell comprises a semicircular windward side and a rectangular leeward side, the semicircular windward side comprises five receiving shell air inlet holes formed in the length direction, and the rectangular leeward side with the hole diameter of # imgabs0 # comprises two receiving shell air outlet holes formed in the length direction; the diameter of the receiving shell air outlet hole close to the end is # imgabs 1 #, the diameter of the receiving shell air outlet hole close to the end is # imgabs 2 #, the standard shell comprises a semicircular windward side and a rectangular leeward side, the semicircular windward side comprises one standard shell air inlet hole formed in the length direction, and the rectangular leeward side with the diameter of # imgabs 3 # imgabs 4 # comprises three standard shell air outlet holes formed in the length direction. And from the position close to the end part to the inside, the aperture size is # imgabs5, a certain pressure difference margin is provided, the influence of the attack angle change of an airplane or the disturbance of airflow can be filtered out, and the purposes of reducing the false alarm rate of the differential pressure type icing annunciator and improving the reliability of the annunciator are achieved.

Description

Technical Field

[0001] The invention belongs to the technical field of anti-icing and deicing, and relates to a low false alarm rate pressure difference type icing signal device housing. Background Art

[0002] The differential pressure ice annunciator is used in the engine air intake. Its receiving shell and standard shell are both exposed to the engine airflow. Under the action of the airflow, both the receiving shell and the standard shell will generate a certain amount of pneumatic pressure. Under icing conditions, the air inlet on the standard shell will be covered and closed by ice first, resulting in a certain pressure difference between the receiving shell and the standard shell to realize the icing alarm function.

[0003] In actual use, due to changes in the aircraft's angle of attack or disturbances in the airflow, a pressure difference will occur between the receiving shell and the standard shell, causing the signaler to give false alarms, causing great trouble to the pilot, interfering with the pilot's judgment of the icing environment, and affecting the execution of the flight mission.

[0004] Analysis shows that the receiving shell and standard shell of the pressure differential ice signal device before improvement have a large tolerance range of the surface pores, resulting in a wide distribution range of pressure differences during actual use of the pressure differential ice device. When the receiving shell and standard shell with a smaller pressure difference are assembled on the product, false alarms are likely to occur during actual use. Summary of the invention

[0005] The present invention provides a low false alarm rate differential pressure type icing signal housing, which reduces the false alarm rate of the differential pressure type icing signal and improves the reliability of the signal, so that it can better meet the requirements of combat training.

[0006] The present invention provides a low false alarm rate pressure differential type ice signal device housing, comprising a receiving housing and a standard housing, wherein

[0007] The receiving shell includes a semicircular windward surface and a rectangular leeward surface. The semicircular windward surface includes five receiving shell air inlet holes arranged along the length direction. The hole sizes are The rectangular leeward surface includes two receiving shell air outlet holes arranged along the length direction, and the receiving shell air outlet hole near the end has an aperture of

[0008]

[0009] The diameter of the air outlet hole of the inner receiving shell is

[0010] The standard shell includes a semicircular windward surface and a rectangular leeward surface. The semicircular windward surface includes a standard shell air inlet arranged along the length direction, and the aperture size is The rectangular leeward surface includes three standard shell air outlets arranged along the length direction. From the end to the inside, the hole sizes are

[0011] Advantageously, the air inlet holes of the receiving shell face the airflow direction, with a spacing of 3±0.02 mm.

[0012] Advantageously, the spacing between the air outlet holes of the receiving shell is 21±0.02 mm.

[0013] Advantageously, the air inlet hole of the receiving shell and the air outlet hole of the receiving shell are on the same air inlet cross section, and the air outlet holes of the receiving shell are distributed outside both ends of the air inlet hole of the receiving shell in the length direction.

[0014] Advantageously, the air inlet of the standard housing faces the air flow direction, and the spacing between the air outlets of the standard housing from the outer end to the inside is 32.3±0.1 mm and 5±0.02 mm respectively.

[0015] Advantageously, the standard housing air inlet and the standard housing air outlet are on the same air inlet cross section.

[0016] Advantageously, 2 The standard shell air outlet holes are distributed on one side of the standard shell air inlet holes in the length direction.

[0017] Advantageously, The standard shell air outlet holes are distributed on the other side of the standard shell air inlet holes in the length direction.

[0018] Beneficial effect: The pressure differential ice signal device has a certain pressure difference margin during actual use, can filter out the influence of aircraft angle of attack change or airflow disturbance, achieve the purpose of reducing the false alarm rate of the pressure differential ice signal device and improving the reliability of the signal device.

[0019] The features, functions, and advantages that have been discussed can be achieved independently in various examples or may be combined in yet other examples. Further details of the examples can be seen with reference to the following description and drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Examples, as well as preferred modes of use, other objects and description thereof, will be best understood by reference to the following detailed description of examples of the invention when read in conjunction with the accompanying drawings, in which:

[0021] Figure 1 It is a schematic diagram of the structure of the windward side of the receiving shell;

[0022] Figure 2 It is a schematic diagram of the structure of the leeward side of the receiving shell;

[0023] Figure 3 This is a schematic diagram of the windward side structure of a standard shell;

[0024] Figure 4 This is a schematic diagram of the leeward side structure of a standard shell;

[0025] Figure 5 To improve the pressure difference margin of the pressure differential ice signal device. DETAILED DESCRIPTION

[0026] The disclosed examples will be more fully described with reference to the accompanying drawings, in which some (but not all) of the disclosed examples are shown. In fact, many different examples may be described and these examples should not be construed as limited to the examples set forth herein. Instead, these examples are described so that this disclosure will be thorough and complete and will fully convey the scope of the disclosure to those skilled in the art.

[0027] The low false alarm rate pressure difference type icing signal device housing of the present invention comprises a receiving housing and a standard housing.

[0028] See also Figure 1 and Figure 2 The receiving shell embodiment shown in the figure comprises a semicircular windward surface 1, a rectangular leeward surface 2 and surface air holes, wherein the surface air holes comprise five receiving shell air inlet holes 3 and two receiving shell air outlet holes 4 arranged along the length direction, and the aperture size of the receiving shell air inlet holes 3 is The aperture sizes of the air outlet holes 4 of the receiving shell are respectively

[0029] The five air inlet holes 3 of the receiving shell must all face the direction of the airflow, and the spacing between each is 3±0.02mm; the spacing between the two air outlet holes 4 of the receiving shell is 21±0.02mm, and they should be ensured to be on the same air inlet cross-section as the air inlet holes 3 of the receiving shell, and distributed on the outside of both ends of the five air inlet holes.

[0030] See also Figure 3 and Figure 4 The standard shell embodiment shown in the figure comprises a semicircular windward surface 5, a rectangular leeward surface 6 and surface air holes, wherein the surface air holes comprise a standard shell air inlet hole 7 and three standard shell air outlet holes 8 arranged along the length direction, and the aperture size of the standard shell air inlet hole 7 is The standard housing air outlet 8 has a diameter of

[0031] The air inlet 7 of the standard housing must face the air flow direction. The spacing between the three air outlet holes 8 of the standard housing from the outer end to the inner end is 32.3±0.1mm and 5±0.02mm respectively, and it should be ensured that they are on the same air inlet cross section as the air inlet 7 of the standard housing. Standard housing vent holes 8 and The standard housing air outlet holes 8 are distributed on both sides of the standard housing air inlet hole 7.

[0032] The pressure difference margin of the improved pressure differential ice signal is as follows: Figure 5 As shown, the minimum difference is 529Pa.

[0033] Descriptions of different advantageous arrangements have been presented for purposes of illustration and description, but the description is not intended to be exclusive or limited to examples of the disclosed form. Many modifications and variations will be apparent to those of ordinary skill in the art. Additionally, different advantageous examples may be described as having different advantages over other advantageous examples. The selected example or examples are selected and described in order to best illustrate the principles of the examples, practical applications, and to enable those of ordinary skill in the art to understand the disclosure as having various examples with various modifications suitable for the particular use contemplated.

Claims

1. A low false alarm rate differential pressure type ice signal housing, characterized in that: Includes a receiving housing and a standard housing, wherein The receiving shell comprises a semicircular windward surface (1) and a rectangular leeward surface (2), wherein the semicircular windward surface (1) comprises five receiving shell air inlet holes (3) arranged along the length direction, and the hole diameters are The rectangular leeward surface (2) comprises two receiving shell air outlet holes (4) arranged along the length direction, and the receiving shell air outlet hole (4) near the end has a hole diameter of The diameter of the air outlet hole (4) of the inner receiving shell is The standard shell includes a semicircular windward surface (5) and a rectangular leeward surface (6). The semicircular windward surface (5) includes a standard shell air inlet hole (7) arranged along the length direction, and the hole size is The rectangular leeward surface (6) comprises three standard shell air outlet holes (8) arranged along the length direction, and the hole diameters are respectively 2. The low false alarm rate differential pressure type ice signal device housing according to claim 1, characterized in that: The air inlet holes (3) of the receiving shell face the airflow direction, and the spacing is 3±0.02mm.

3. The low false alarm rate differential pressure type ice signal device housing according to claim 2, characterized in that: The spacing between the air outlet holes (4) of the receiving shell is 21±0.02 mm.

4. The low false alarm rate differential pressure type ice signal housing according to claim 3, characterized in that: The air inlet hole (3) of the receiving shell and the air outlet hole (4) of the receiving shell are on the same air inlet cross section, and the air outlet holes (4) of the receiving shell are distributed outside the two ends of the air inlet hole (3) of the receiving shell in the length direction.

5. The low false alarm rate differential pressure type ice signal device housing according to claim 1, characterized in that: The air inlet (7) of the standard housing faces the air flow direction, and the spacing of the air outlet (8) of the standard housing from the outer end to the inside is 32.3±0.1mm and 5±0.02mm respectively.

6. The low false alarm rate differential pressure type ice signal device housing according to claim 5, characterized in that: The standard housing air inlet (7) and the standard housing air outlet (8) are on the same air inlet cross section.

7. The low false alarm rate differential pressure type ice signal device housing according to claim 6, characterized in that: The standard housing air outlet holes (8) are distributed on one side of the standard housing air inlet hole (7) in the length direction.

8. The low false alarm rate differential pressure type ice signal device housing according to claim 7, characterized in that: The standard housing air outlet holes (8) are distributed on the other side of the standard housing air inlet holes (7) in the length direction.

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