Water meter with an anti-reverse-rotation device
First Claim
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1. A magnet-rotor type water meter with an anti-reverse-rotation device comprising:
- a rotor chamber accommodating a rotor with rotor shaft wherein said rotor shaft is provided with a ferrite magnet securely inlaid onto the upper end thereof,a hermetically enclosed inner casing located above said rotor chamber,a scale plate mounted on the upper end of said inner casing,an instrument gear assembly housed in said inner casing wherein said instrument gear assembly includes a central main shaft and a pointer driving gear, said central main shaft being provided with a ferrite magnet securely inlaid onto the lower end thereof and said pointer driving gear being provided with an instrument pointer securely mounted on the upper end of the gear shaft of said pointer driving gear,whereby said ferrite magnet magnetically cooperates with said ferrite magnet as said rotor shaft is rotated and thereby said central main shaft is rotated to drive said instrument gear assembly and thus to rotate said instrument pointer, andcharacterized in that one or more stepped back stops are formed on the annular upper side of said pointer driving gear, and each of said stepped back stops is gradually sloped down in the normal rotational direction R1 to form an inclined plane, and one or more stop pin cylinders are provided on the underside of said scale plate in the vicinity of the upper gear shaft, and one or more stop pins are slidably inserted each into said stop pin cylinders, whereby the lower ends of said stop pins smoothly slide on said inclined planes while moving up- and downward within said stop-pin cylinders due to the cam action of said inclined planes without preventing the rotation of said pointer driving gear in the normal direction R1, whereas said stepped back stops are caught by said stop pins, thereby preventing the reverse rotation of said pointer driving gear when rotating in the reverse direction R2.
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Abstract
An improved magnetic rotor type water meter having an anti-reverse-rotation device for preventing the reverse rotation of the pointer driving gear of the water meter, although the rotor or impeller of the water meter is rotated in the reverse direction by a counterflow from the outlet or by any type of fluid pressures applied to the outlet.
13 Citations
4 Claims
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1. A magnet-rotor type water meter with an anti-reverse-rotation device comprising:
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a rotor chamber accommodating a rotor with rotor shaft wherein said rotor shaft is provided with a ferrite magnet securely inlaid onto the upper end thereof, a hermetically enclosed inner casing located above said rotor chamber, a scale plate mounted on the upper end of said inner casing, an instrument gear assembly housed in said inner casing wherein said instrument gear assembly includes a central main shaft and a pointer driving gear, said central main shaft being provided with a ferrite magnet securely inlaid onto the lower end thereof and said pointer driving gear being provided with an instrument pointer securely mounted on the upper end of the gear shaft of said pointer driving gear, whereby said ferrite magnet magnetically cooperates with said ferrite magnet as said rotor shaft is rotated and thereby said central main shaft is rotated to drive said instrument gear assembly and thus to rotate said instrument pointer, and characterized in that one or more stepped back stops are formed on the annular upper side of said pointer driving gear, and each of said stepped back stops is gradually sloped down in the normal rotational direction R1 to form an inclined plane, and one or more stop pin cylinders are provided on the underside of said scale plate in the vicinity of the upper gear shaft, and one or more stop pins are slidably inserted each into said stop pin cylinders, whereby the lower ends of said stop pins smoothly slide on said inclined planes while moving up- and downward within said stop-pin cylinders due to the cam action of said inclined planes without preventing the rotation of said pointer driving gear in the normal direction R1, whereas said stepped back stops are caught by said stop pins, thereby preventing the reverse rotation of said pointer driving gear when rotating in the reverse direction R2. - View Dependent Claims (2, 3, 4)
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Specification