Today, I will introduce a national invention authorized patent-a dual rotor flowmeter. The patent was applied for by Chongqing Naide Industrial Co., Ltd., and the authorization was announced on May 10, 2017.
Content descriptionThe invention relates to the technical field of fluid measurement, in particular to a dual-rotor flowmeter.
Background of the inventionThe double-rotor flowmeter is a positive displacement flowmeter. During the measurement, the number of rotations of the rotor has a certain proportional relationship with the cumulative flow of fluid. The flow of fluid can be calculated according to the number of rotations of the rotor.
The existing double-rotor flowmeter is provided with a pair of involute meshing rotors. The axis of the rotor is perpendicular to the axis of the measuring chamber (that is, the double-rotor flowmeter is radially extended), and the volume is relatively large. The dual-rotor flowmeter is also provided with a signal output mechanism, so that the number of rotations of the rotor can be output in the form of a signal, and then the meter can calculate the output fluid flow rate according to the signal.
However, because the linear shape of the meshing teeth provided on the rotor surface is an involute linear shape, during use, the meshing between the two rotors belongs to the contact between the tooth surface and the tooth surface, and the contact surface is relatively large. During the rotation, Relative sliding occurs between the two rotors, and relative rolling occurs, causing wear and tear between the rotors. The wear of the rotors will reduce the degree of meshing between the rotors, which in turn will reduce the accuracy of flow measurement.
Therefore, how to reduce the wear between the rotors is a technical problem that needs to be solved by those skilled in the art.
Summary of the inventionIn view of this, the purpose of the present invention is to provide a dual-rotor flowmeter, which can reduce the wear between the rotors and improve the accuracy of the dual-rotor flowmeter.
The present invention provides a dual-rotor flowmeter, which comprises a housing, a metering chamber including a fluid inlet and a fluid outlet is arranged inside the housing, and a first rotor and a second rotor placed inside the metering chamber, Both the first rotor and the second rotor are provided with cycloidal teeth, and the cycloidal teeth of the first rotor and the second rotor are arranged in the same manner.
The tooth inner linear shape of the cycloid tooth includes a first outer cycloid and a second outer cycloid, the tooth outer linear shape of the cycloid tooth is a third outer cycloid, and the tooth root linear shape of the cycloid tooth is a tooth root A circular arc line, the tooth top line shape of the cycloid tooth is a tooth top arc line; the end point of the first outer cycloid and the starting point of the second outer cycloid cross the tooth root arc line Connection; the starting point of the first outer cycloid and the end point of the third outer cycloid are connected by the addendum arc line; the end point of the second outer cycloid is connected with the third outer cycloid The arc line formed by the line between the starting points of the cycloid is a rolling arc line.
The first epicycloid of the first rotor is the movement track of the starting point of the first epicycloid of the second rotor; the second epicycloid of the first rotor is the third epicycloid of the second rotor. The trajectory of the end point of the epicycloid; the third epicycloid of the second rotor is the trajectory of the end point of the second epicycloid of the first rotor; the first epicycloid of the second rotor is The trajectory of the starting point of the first outer cycloid of the first rotor; the second outer cycloid of the second rotor is the trajectory of the end point of the third outer cycloid of the first rotor; The third outer cycloid of the second rotor is the trajectory of the end point of the second outer cycloid of the first rotor.
Preferably, the center distance between the first rotor and the second rotor is 2R0; the calculation relationship between the total length L of the first rotor and the cycloid tooth lead T of the first rotor is: L=2T, and the total length of the second rotor is equal to the total length of the first rotor, and the cycloid tooth lead of the second rotor is equal to the cycloid tooth lead of the first rotor. The radian of the tooth tip arc is equal to the radian of the tooth root arc, and the radius of the tooth root arc is r, r=2R0-R. The metering bin is separated from the housing, and there is a gap between the outer surface of the metering bin and the inner surface of the housing.
Preferably, a first plane alloy bearing, a second plane alloy bearing, a first spherical alloy bearing and a second spherical alloy bearing are further provided, wherein the first plane alloy bearing is fixedly connected to the rotation shaft of the first rotor , The first spherical alloy bearing is fixedly connected with the end cover of the metering chamber, the first spherical alloy bearing and the first planar alloy bearing rotate relative to each other and the two are in point contact; the second planar alloy The bearing is fixedly connected to the rotating shaft of the second rotor, the second spherical alloy bearing is fixedly connected to the end cover of the metering chamber, and the second spherical alloy bearing rotates relative to the second plane alloy bearing And the two are in point contact. The rolling bearing of the first rotor and the rolling bearing of the second rotor are both deep groove ball bearings. It also includes a guide mechanism. The guide mechanism is two helical gears that mesh with each other. The two helical gears are arranged at the inlet end of the housing, and the two helical gears are connected to the rotation of the first rotor respectively. The shaft is connected to the rotation of the second rotor; one of the helical gears is inlaid with magnetic steel, and the magnetic steel is used to cooperate with the signal sensor. The helical gear is provided with a through hole, and the through hole is communicated with the entrance of the metering bin. The axis of the first rotor and the axis of the second rotor are arranged horizontally, and the axis of the first rotor and the axis of the second rotor are both arranged in parallel with the axis of the dual-rotor flowmeter.
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