Anti-fogging meter

Abstract

The invention discloses an anti-fogging meter, which comprises a lower dashboard shell and an upper dashboard shell. A rear dashboard cavity is formed between the lower dashboard shell and the upper dashboard shell, a front meter cover is hermetically mounted on the upper dashboard shell, a front dashboard cavity is formed between the upper dashboard shell and the front meter cover, and a dial is mounted on the upper dashboard shell and provided with a meter shaft hole. A meter movement mounting board and a meter movement are mounted in the rear dashboard cavity, a meter shaft is arranged on the meter movement, a meter needle cap is mounted at the upper end of the meter shaft, a meter needle is mounted on the meter needle cap, a meter shaft hermetical isolation device is arranged between the dial and the meter movement mounting board to partition the meter shaft and the rear dashboard cavity, and a meter shaft isolation cavity is communicated with the meter shaft hole. The front cavity and the rear cavity are partitioned by the meter shaft hermetical isolation device, air containing heavier vapor in the rear cavity cannot enter the front cavity, and accordingly vapor sources are reduced, fogging of the front meter cover can be effectively prevented, visibility of the meter is improved, and observation is facilitated for drivers.

Description

technical field [0001] The invention relates to an instrument, in particular to a vehicle instrument. Background technique [0002] The instrument is one of the important accessories to grasp the running status of the vehicle. The driver can grasp the working condition by means of the display of the instrument during driving. The working conditions of agricultural machinery are complex. In the case of a large temperature difference between the inside and outside, a layer of fog is easily generated on the inner layer of the instrument cover, which affects the visualization effect of the instrument and makes it difficult for the machine operator to accurately grasp the operating status of the machine. [0003] Traditional needle-type vehicle gauges, including but not limited to stepper motor gauges, moving magnet gauges and mechanical gauges, have the following common features in structure, such as Figure 4 Shown, namely by table front cover 3, table needle 9, table needle ca...

AI Technical Summary

Problems solved by technology

[0006] There are two traditional anti-fog methods for instruments: one is to strengthen the ventilation inside and outside the instrument, eliminate the temperature difference between the inside and outside of the instrument, and prevent the hot air with high water vapor content from condensing water mist on the front cover of the instrument at a lower temperature to achieve instrument anti-fogging. The purpose of fog, but this kind of method improves the air permeability of the instrument itself, and at the same time means that the waterproof and dustproof performance of the instrument is seriously reduced. Facing the harsh working environment of agricultural machinery and engineering vehicles, this approach is obviously not advisable.

The second is to spray anti-fogging agent on the inner surface of the front cover of the meter to destroy the surface tension of the water, so that the hot and humid air in the meter cannot condense into fine and small water droplets in the front cover of the meter, so as to achieve the purpose of anti-fog. The defective of method is: 1, effective time is short

If the fogging conditions are met frequently, regardless of whether the instrument itself has been used, the anti-fogging agent needs to be re-sprayed every 5-7 days, which also requires the user to frequently disassemble the instrument for maintenance and maintenance. Obviously, this The method is not only cumbersome, but also for the product instrument within the warranty period, it is not advisable to disassemble the instrument frequently; 2. The anti-fog effect is poor

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