JPS60100722A - Capacity type flow meter - Google Patents

Abstract

PURPOSE:To reduce noises by constituting pilot gears by fitting helical gears which have the same twist direction with a couple of helical gear rotators to one end part of their rotating shafts. CONSTITUTION:Helical gear rotators 1 and 2 having the same waveform curve are arranged rotatably through thrust bearings 6, 6... in a rotator storage chamber 5 which has an inflow port 3 and an outflow port 4 while engaging each other. Pilot gears 7 and 8 are constituted by fitting the helical gears which has the same twist directions with the rotators 1 and 2 to the rotating shaft 9 and 10 projecting from the storage chamber 5 in one body. When fluid flows in from the intake 3, the rotators 1 and 2 are applied with the pressure of the fluid and then the rotators 1 and 2 and pilot gears 7 and 8 come together to form a couple of single helical gears; and axial displacement due to a thrust load operating on the rotators alternately in absorbed to smooth the rotation. Consequently, the noise level in operation is lowered and, specially, rasping noises of high frequency are reduce extremely.

Description

TECHNICAL FIELD The present invention relates to a positive displacement flowmeter with a helical gear rotor.

(Prior art) A flow meter with a pair of helical gears as a rotor does not require a pilot gear in principle because the rotors roll and rotate in contact with each other. Currently, gears are used.

Conventionally, this pilot gear was constructed from a spur gear, but there was a problem in that it was noisy due to bang crash.

(1) In view of this problem, the uninvented invention provides a pilot gear by attaching a helical gear having the same twist direction as the helical gear rotor to one end of the rotating shaft of a pair of helical gear rotors. [To provide a positive displacement flowmeter with reduced noise]
"Target."

(Structure) Therefore, details of the present invention will be described below based on illustrated embodiments.

1 and 2 show an embodiment of the present invention, in which reference numeral 1.2 indicates a helical gear rotor with the same surface curve, an inlet [13] and an outlet [13]. Thrust bearings 6 are inserted into the rotor housing chamber 5 in which one bearing 4 is inserted in a mutually engaged state.
．． 6... are arranged in 11 rotary positions.

Reference numerals 7 and 8 denote pilot gears, each of which is a characteristic part of the present invention, and a rotating shaft 9.1 with one end protruding from the storage chamber 5.
It is constructed by integrally incorporating a helical gear with a helical gear twisted in the same direction as the twisting direction of rotors 1 and 2.

In this embodiment, when the fluid flows in from the inlet 3, the first rotor 1.2 receives the pressure of the fluid, and the first rotor 1.2 and the pilot gear 7.8 together form a pair of single helical gears. The rotor rotates smoothly by absorbing axial displacement caused by thrust loads that alternately act on the rotor. This allows the third
As shown in the figure, the noise level during operation can be lowered, and in particular, high-frequency noise that is unpleasant to the ears can be significantly reduced.

In this embodiment, the rotor is composed of three leaves, but the same effect can be obtained even if the rotor is made of 4Ii or more.

(Effects) As described above, according to the present invention, since the pilot is a helical gear, a large meshing ratio can be obtained, and rotation becomes smooth. In addition, since the pilot gear is twisted in the same direction as the rotor, the rotor and pilot gear are integrated to form a single helical gear, which prevents movement in the axial direction due to thrust constraint. The rotor can be smoothly rotated without becoming unmeshable, and furthermore, since the rotation is smooth and there is no chance of unmeshing, wear and noise can be reduced.

[Brief explanation of the drawing]

FIG. 1 is a plan view of an apparatus showing one embodiment of the present invention, and FIG.
The figure is a sectional view of the same apparatus as above, and FIGS. 3(A) and 3(B) are explanatory diagrams showing the noise levels of the above apparatus and the conventional capacitive type Meteor, respectively. ■, 2...Rotor 6...Thrust bearing 7.8
... Helical gear 5 ... Containment room applicant Tokyo Tatsuno agent 5r Riju Nishikawa Kei Yodo Kimura Katsuhiko Figure 1 3rd round f (m'/h)

Claims (1)

[Claims] A pair of helical gear rotors having the same tooth profile curve are rotatably disposed in a housing chamber in a state in which they are interlocked with each other, and one end of the rotation axis of the rotor is provided with a helical gear rotor in the helical direction of the rotor. A capacitive flowmeter that is made up of a viroft gear by attaching a helical gear with the same twist.