Today, I will introduce a national invention authorized patent-photoelectric water meter. The patent was applied for by Ningbo Longer Instrument Co., Ltd., and the authorization was announced on February 8, 2017.
Content descriptionThe utility model relates to the field of water meters, in particular to a photoelectric water meter.
Background of the inventionWater meters are currently the most important measuring instruments used for tap water measurement at home and abroad. The photoelectric water meter is favored by users because of its high measurement accuracy, small starting flow, convenient meter reading, beautiful appearance, safety and sanitation, and long life. The meter head of the photoelectric water meter is generally a sealed structure, including the water meter housing, the word window, the upper splint, the transparent plate and the snap ring. The word window and the upper splint are housed in the water meter housing, and the snap ring covers the transparent plate and is connected to the water meter housing. The upper end surface is fixed, the transparent plate abuts against the upper surface of the word window, the upper surface of the transparent plate and the upper splint is provided with a cavity for containing liquid, and the upper splint is equipped with a rotating needle, which is easy to accumulate in the cavity when calibrating the water meter Air bubbles, if the air bubbles stay on the needle, it is easy to produce additional resistance to the rotation of the needle, thereby affecting the sensitivity of the water meter, greatly reducing the measurement accuracy of the water meter, and resulting in a low pass rate during the calibration of the water meter.
Summary of the inventionThe technical problem to be solved by the utility model is to provide a photoelectric water meter which can prevent air bubbles from staying on the rotating needle and affect the sensitivity of the water meter.
The technical solution adopted by the utility model to solve the above-mentioned problems is: a photoelectric water meter, comprising a water meter housing, an upper splint and a transparent plate. The upper end surface of the transparent plate and the upper splint is provided with a cavity for accommodating liquid. The end surface of the upper splint is provided with a rotating needle for rotating in the cavity to display the reading, and is characterized in that: an upper cover is also provided above the upper splint, and the upper cover is provided with a rotating needle for accommodating Hold the hole.
Compared with the prior art, the utility model has the advantages that: an upper cover plate is arranged between the upper splint and the transparent plate to reduce the height of the cavity, thereby reducing the possibility of air bubbles staying; and the transfer needle is accommodated in the upper cover plate In the accommodating hole, even if there are bubbles staying in the cavity, the bubbles will float up due to gravity, and the bubbles will stay between the end surface of the upper cover plate and the bottom surface of the transparent plate, and it is not easy to stay between the accommodating hole and the needle. In the gap, so as to prevent air bubbles from directly contacting the needle to affect the sensitivity of the needle, and to improve the metering progress of the water meter.
As an improvement of the present invention, the thickness of the upper cover plate is greater than the height of the rotating needle. Through the improvement, it is ensured that the height of the gap between the rotating needle and the accommodating hole is lower than the height of the cavity, so that under the action of gravity, Ensure that residual bubbles stay in the cavity so as not to affect the sensitivity of the needle. The upper cover plate and the upper clamping plate are detachably connected. Through the improvement, the upper cover plate is detachable, and the upper cover plates with different numbers or positions of containing holes can be replaced to meet the use needs of different models of photoelectric water meters.
The bottom surface of the upper cover plate of the utility model is provided with an inserting post protruding outwards, and the end surface of the upper splint is provided with a socket for matching with the inserting post. Through the improvement, the upper cover and the upper splint pass the inserting post and the socket Detachable connection, easy to disassemble and assemble, and it can be positioned accurately by inserting post and jack. The outer peripheral surface of the upper cover plate is provided with a concave cavity for cooperating with the convex block on the inner peripheral surface of the outer ring of the word window to limit the upper cover plate in the circumferential direction. Through the improvement, the upper cover plate passes through the convex block and the concave cavity. Cooperate to limit the circumferential rotation of the upper cover.
The outer peripheral surface of the upper cover plate is provided with a step for cooperating with the press block on the inner peripheral surface of the outer ring of the word window to limit the upper cover plate in the axial direction. Through the improvement, the upper cover plate is pressed by the press block and the step. Close the upper splint to avoid axial movement of the upper cover.
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