Negative part structure of magnetron

Abstract

The invention relates to a negative part structure of a magnetron. A shielding cap with a smooth structure and an upper convex cambered surface is formed at the upper end of an upper sealing element; the surface area of the upper surface of the shielding cap is correspondingly increased, so that the radiance of the upper surface of the shielding cap is improved to make energy collected on a negative part of the magnetron timely and outwards diffused, cool the shielding cap and the whole negative part of the magnetron, enable the negative part of the magnetron to operate at normal temperature, avoid the damage to the magnetron caused by over-high temperature of the negative part, and prolong the normal service life of the magnetron. Arc bevel angles are positioned at junctions of all planes and circumference surfaces of the upper sealing element and a lower sealing element, the original closed angles on all parts of the negative part are eliminated, the magnetron is prevented from high-voltage breakdown caused by the closed angles, and a product fault caused by fire striking of the magnetron negative is avoided.

Description

technical field [0001] The invention belongs to the technical field of magnetrons, and in particular relates to a shielding cap with an arc-shaped upper surface, and chamfers are provided to remove the edges and corners on the upper and lower sealing parts respectively, so as to improve the thermal electron radiation rate and avoid high voltage shock The structure of the cathode part of the magnetron. Background technique [0002] figure 1 It is a longitudinal sectional view of a magnetron structure in the prior art; figure 2 is a cross-sectional view of the structure of the cathode part of the magnetron in the prior art; image 3 It is a schematic diagram of the structure of the cathode part of the magnetron in the prior art. [0003] Such as Figure 1 to Figure 3 As shown, the magnetron mainly includes: an anode part; a cathode part; a magnetic pole part; a microwave emitting part. [0004] The anode part consists of a barrel-shaped anode shell 11, on the inner wall ...

AI Technical Summary

Problems solved by technology

[0017] In the prior art cathode part structure of the magnetron, the shielding cap is a protruding circular platform structure arranged on the upper end of the upper seal, and the upper surface of the shielding cap is a circular plane. When the magnetron starts to work, the cathode part generates A large amount of heat, the thermal electrons generated by the filament are mainly emitted from the shielding cap at the upper end of the upper seal, that is, the thermal electrons are emitted through the upper surface formed by the circular plane of the shielding cap. The emissivity of the upper surface is small, which is easy to cause the shielding cap and The temperature of the cathode part of the entire magnetron is too high, thereby shortening the service life of the magnetron

In addition, since both the upper seal and the lower seal adopt a cylindrical structure, the intersection of the plane and the circumferential surface in the upper seal and the lower seal and the contact joint between the upper surface of the shielding cap and the upper seal form a relatively sharp These edges and corners are easy to lead to excessive voltage collection during the use of the magnetron, which will cause the magnetron to be damaged by high voltage breakdown

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