Electronic water meter with three-proof function

Abstract

The invention relates to an electronic water meter with a three-proofing function. The electronic water meter comprises a base, a shell, a water flow metering component, a spherical valve component and a main circuit board, an installation groove used for installing the main circuit board and an installation cavity used for installing a control circuit board of the water flow metering component are formed in the inner side of the shell, the installation groove and the installation cavity are both filled with organic silicon gel which can cover the corresponding circuit boards, and the wire outlet terminals in the shell are each coated with a silica gel layer; the shell is provided with first through holes allowing water vapor to get in and out. According to the electronic water meter, through structure design is adopted, a seal ring does not need to be arranged on the joint of the whole shell, air tightness sealing is not needed, the water vapor can pass through freely through the first through holes, the internal and external pressure balance in the water meter shell is guaranteed, the problems that in the water meter using process, plastic deformation occurs due to the imbalance of the internal and external pressure, and the water vapor is accumulated due to the fact that for the air tightness structure, the water vapor can easily get in but not easily get out are effectively solved, the reliability of the water meter is improved, and the service life of the water meter is prolonged.

Description

technical field [0001] The invention relates to the technical field of electronic water meters, in particular to an electronic water meter with three-proof functions suitable for high temperature, high humidity and underwater environments. Background technique [0002] The structural design of existing electronic water meters generally adopts airtight three-proof design, and most of the plates are sealed with hard transparent glue or beeswax. Adopting such an airtight design has the following disadvantages: [0003] (1) Nitrile material sealing rings or fluororubber sealing rings with airtight design structure will gradually age, weaken or lose the sealing effect after long-term use in oily environments or meters; plastic products will also appear after long-term use. Aging, brittleness, deformation and other phenomena lead to poor sealing effect; [0004] (2) When the electronic water meter works underwater, the water pressure on the shell is unbalanced with the pressure ...

AI Technical Summary

Problems solved by technology

[0003] (1) Nitrile material sealing rings or fluororubber sealing rings with airtight design structure will gradually age, weaken or lose the sealing effect after long-term use in oily environments or meters; plastic products will also appear after long-term use. Aging, brittleness, deformation and other phenomena lead to poor sealing effect;

[0004] (2) When the electronic water meter works underwater, the water pressure on the shell is unbalanced with the pressure in the airtight cavity, which leads to deformation of the plastic parts and poor sealing effect of the product, which makes the circuit board damp and invalid, directly affecting the electronic water meter service life;

[0005] (3) Moisture is easy to invade the sealed cavity of the airtight design structure with the change of pressure or temperature, and the moisture cannot be discharged after entering, and it is easy to generate condensation on the liquid crystal surface of the electronic water meter, and even erode the circuit board

[0007] However, for the water meter in the above-mentioned prior art, since the printed circuit board is only sealed with glue, the water pressure entering the water meter casing will cause a certain pressure on it, which will affect the light transmission flux of the photoelectric conversion system of the water meter.

Moreover, for water meters that require airtightness, in order to ensure good airtightness, most existing water meters will be provided with sealing rings on the edge of the casing to play a waterproof role. However, in high temperature and high humidity environments, water vapor easily enters the casing. It is not easy to discharge in the body, resulting in the accumulation of water vapor in the shell, and the imbalance of the internal and external pressure of the watch case, which in turn leads to the deformation of the installation parts in the watch case and affects the performance of the water meter.

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