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Revolution meter for measuring revolving speed of electric fan

A technology of tachometer and electric fan, which is applied in the field of tachometer, can solve the problems of complex circuit structure, difficult popularization and promotion, and low accuracy, and achieve the effect of simple circuit structure, popularization and improvement, and high accuracy

Inactive Publication Date: 2015-06-10
SICHUAN DITEL ELECTRONICS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In the production process of electric fans, in order to make people convenient and comfortable to use, corresponding speed regulation tests will be carried out. However, many tachometers used to measure the wind speed of electric fans are not easy to operate, have low accuracy, complex circuit structures, many components, and low cost. High, low sensitivity, difficult to popularize and promote

Method used

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  • Revolution meter for measuring revolving speed of electric fan

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Embodiment Construction

[0009] The present invention will be further described below in conjunction with accompanying drawing:

[0010] like figure 1 Shown: the present invention includes a DC power supply V, a bulb HL, a microamp meter PA, a first resistor R1 to a sixth resistor R6, a first capacitor C1 to a third capacitor C3, a first diode VD1, and a second diode Tube VD2, transistor VT, phototransistor VTL and transformer T, the positive pole of the DC power supply V is connected to the first end of the sixth resistor R6 and the first end of the bulb HL at the same time, and the second end of the sixth resistor R6 is connected to the third capacitor at the same time The first end of C3, the first end of the first resistor R1, the first end of the second resistor R2 are connected to the first end of the primary coil of the transformer T, and the collector of the phototransistor VTL is connected to the first end of the first capacitor C1 at the same time. terminal is connected to the second end of...

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Abstract

The invention discloses a revolution meter for measuring the revolving speed of an electric fan. The revolution meter comprises a direct-current power source, a bulb, a microampere gauge outfit, a first resistor, a second resistor, a third resistor, a fourth resistor, a fifth resistor, a sixth resistor, a first capacitor, a second capacitor, a third capacitor, a first diode, a second diode, a triode, a photosensitive triode and a transformer. The revolution meter has the advantages that according to the characteristics of the photosensitive triode, light rays not shielded by fan blades during revolution of a fan are irradiated to the photosensitive triode intermittently to form pulse potentials, the pulse potentials are differentiated by a differentiating circuit to form sharp pulses, and pulse signals are formed after diode rectification and finally sent to the microampere gauge outfit to achieve revolving speed measurement; the revolution meter is simple and convenient to operate, high in accuracy, simple in circuit structure, low in cost and beneficial to popularization and improvement and has few elements.

Description

technical field [0001] The invention relates to an electronic rotational speed measuring device, in particular to a tachometer for measuring the rotational speed of an electric fan. Background technique [0002] The tachometer is one of the necessary instruments in the mechanical industry, which is used to measure the rotational speed, linear speed or frequency of the motor. Commonly used in motors, electric fans, paper, plastics, chemical fibers, washing machines, automobiles, airplanes, ships and other manufacturing industries. In the production process of electric fans, in order to make people convenient and comfortable to use, corresponding speed regulation tests will be carried out. However, many tachometers used to measure the wind speed of electric fans are not easy to operate, have low accuracy, complex circuit structures, many components, and low cost. High, low sensitivity, difficult to popularize and promote. Contents of the invention [0003] The object of th...

Claims

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Application Information

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IPC IPC(8): G01P3/486
Inventor 雷勇王举帅娟
Owner SICHUAN DITEL ELECTRONICS