JPH01278900A - Deicer - Google Patents

Abstract

PURPOSE:To remove any icing on a plate surface in an effective manner by setting up a piezoelectric element, being impressed with alternating voltage, on a surface at the opposite side of an icing surface of the plate body. CONSTITUTION:Alternating voltage is impressed on piezoelectric elements 2-5 set up on a surface at the opposite side of an icing surface of a plate body (for example, an outer plate forming a wing leading edge B) by AC power sources D2-D5, vibrating these piezoelectric elements 2-5. The plate body 1 is vibrated by this vibration and thereby any ice stuck to a plate surface is shaken down.

Description

Detailed Description of the Invention A1 Object of the Invention (]) Industrial Field of Application The present invention relates to an icing prevention device that prevents ice from adhering to the surface of a plate, particularly for the outer panels of aircraft, automobiles, etc. The present invention relates to an icing prevention device suitable for preventing icing on surfaces.

(2) Conventional Technology Ice may adhere to the outer surface of aircraft etc. depending on the surrounding environment. For example, the areas where ice tends to accumulate on airplanes are
As shown in FIG. 3, this is the front part of the fuselage surface such as the front part A of the fuselage or the leading edge B of the wing.

Icing on the surface of the aircraft causes an increase in the weight of the aircraft, an increase in air resistance, etc. Icing on the leading edges of the wings is especially dangerous because it makes lift unstable.

Therefore, icing prevention devices have been conventionally provided at the leading edge B of the blade and the like.

As shown in Fig. 4, a conventional icing prevention device uses a conduit 02 and an anti-ice valve 03 to control the opening and closing of the high-temperature gas from the engine to the outer plate 01 of the leading edge B of the wing.
Heaters that are guided inward, heaters that are attached to the surface of the outer plate 01 of the leading edge B of the blade (not shown), and the like are known. These icing prevention devices heat the outer panel 01 using the high-temperature gas or heater to melt the ice that is in contact with the surface of the outer panel 01 and cause it to fall off.

(3) Problem to be solved by the invention However, in the icing prevention device that heats the outer plate Of with high-temperature gas, the conduit 02,
There is a problem that the weight of the machine increases due to the anti-ice valve 03, etc., and the problem is that the icing prevention device that heats the outer panel 01 with the heater consumes too much power to melt the ice. was there.

The present invention has been made in view of the above-mentioned circumstances, and an object of the present invention is to provide an icing prevention device that is lightweight and consumes less energy.

B0 Structure of the Invention (1) Means for Solving the Problems In order to solve the above problems, the icing prevention device of the present invention includes:
It is characterized in that a piezoelectric element to which an alternating current voltage is applied is disposed on the surface of the plate opposite to the icing surface.

(2) Effect The icing prevention device of the present invention having the above-described configuration is such that when an alternating current voltage is applied to the piezoelectric element disposed on the opposite side of the icing surface of the plate, the piezoelectric element The piezoelectric element vibrates, and the plate also vibrates, and the vibration shakes off the ice.

(3) Embodiment A first embodiment of the icing prevention device according to the present invention will be described below with reference to the drawings.

In Fig. 1, a plurality of piezoelectric elements 2, 3, 4.5 are pasted at intervals in the vertical direction on the inner surface of an outer plate (i.e., a plate body) (i) forming the leading edge B of an aircraft wing. . Although not shown, the piezoelectric elements 2.3.4.5 are also arranged at predetermined intervals in the blade span direction (direction perpendicular to the plane of paper in FIG. 1), and each piezoelectric element 2.2. ..., 3.3
．． ..., 4.4..., and 5,5. . . are connected to the same AC power source, , D, , D, and , respectively.

Next, the operation of the first embodiment of the present invention having the above-described configuration will be explained.

When icing occurs on the surface of the outer panel 1, the AC power source D t+ D 1. D 4+ and the piezoelectric elements 2, 3, 4 . and drive 5. At that time, if the phases of the electric currents aD, , D, , D, and RI are shifted, each piezoelectric element 2, 3, 4, . and 5 vibrate according to the phase. Then, the outer plate 1 is connected to each piezoelectric element 2, 3.
,4. and 5 vibrate in a state where the phase is shifted for each part. This vibration causes the ice attached to the surface of the outer plate 1 to fall off.

Next, a second embodiment of the icing prevention device according to the present invention will be described based on FIG.

In the second embodiment shown in FIG. 2, a support plate 6 having greater rigidity than the outer panel 1 is connected to the inner surface of the outer panel 1 by rivets 7.7. Piezoelectric elements 8 and 9 are arranged between the support plate 6 and the outer plate 1 at intervals in the vertical direction. Although not shown, the piezoelectric elements 8.9 are also arranged at predetermined intervals in the blade span direction (direction perpendicular to the plane of the paper in FIG. 2), and each piezoelectric element 8, 8. ... and 9°9, ... are connected to AC power sources D8 and 9, respectively.

Next, the operation of the second embodiment of the present invention having the above-described configuration will be explained.

When ice builds up on the surface of the outer plate 1, the piezoelectric elements 8 and 9 are driven by the AC power source D11 and the AC power source D11. At this time, if the phases of the power sources Ds and R are shifted, each piezoelectric element 8 and 9 will vibrate according to the phase. In this case, since the support plate 6 has greater rigidity than the outer plate 1, the outer plate 1 vibrates more. At this time, the outer plate 1 vibrates with the phases shifted for each portion where the piezoelectric elements 8 and 9 are disposed. This vibration causes the ice attached to the surface of the outer plate 1 to fall off.

Although the embodiments of the icing prevention device according to the present invention have been described in detail above, the present invention is not limited to the above-mentioned embodiments.
Various design changes can be made without departing from the scope of the invention as set forth in the claims.

For example, by adjusting the placement position and number of piezoelectric elements 2.3.4.5 or 8°9 and the phase of the applied voltage, a traveling wave from above to below can be generated on the outer plate 1, or a resonant standing wave can be generated. By doing so, it is also possible to move the icing on the outer surface of the outer panel 1 downward and cause it to fall off. Further, the support plate 6 that supports the piezoelectric element may be connected to a wing spar or the like instead of being connected to the back surface of the outer plate 1. Furthermore, instead of forming the piezoelectric element into a bronc shape as in the embodiment, it may be formed into a form laminated into a plate shape. Also,
The present invention can be applied not only to the leading edge B of an aircraft wing but also to any plate body on which ice adheres.

C0 Effects of the Invention According to the above-described icing prevention device of the present invention, the plate is vibrated by the vibration of the piezoelectric element that consumes less power, and ice on the surface of the plate can be effectively removed.

[Brief explanation of the drawing]

FIG. 1 is an explanatory diagram of the first embodiment of the icing prevention device according to the present invention, FIG. 2 is an explanatory diagram of the second embodiment, and FIGS.
The figure is an explanatory diagram of the prior art.

Claims (1)

[Claims] An icing prevention device that includes a piezoelectric element to which an alternating current voltage is applied to the surface of a plate opposite to the icing surface.