CN201203447Y

CN201203447Y - Rotary-piston type flowmeter

Info

Publication number: CN201203447Y
Application number: CNU200820048175XU
Authority: CN
Inventors: 杨�远
Original assignee: Individual
Current assignee: Individual
Priority date: 2008-05-23
Filing date: 2008-05-23
Publication date: 2009-03-04
Anticipated expiration: 2018-05-23

Abstract

The utility model relates to a rotary piston flowmeter comprising a measurement cavity with an oil inlet and an oil outlet formed by a sealed casing and a piston in the measurement cavity. A measurement cavity center shaft is arranged in the measurement, a piston center shaft is molded on the piston, a magnetic element is mounted on the piston. When the piston rotates reciprocatingly, the piston center shaft slides along the measurement cavity center shaft wall and circumscribes the measurement cavity center shaft. Comparing to the prior art, the rotary piston flowmeter has simple structure and high precision of measurement data.

Description

A kind of rotary-piston type flowmeters

Technical field:

The utility model relates to liquid material survey instrument technical field, refers in particular to a kind of rotary-piston type flowmeters.

Background technology:

Rotary-piston type flowmeters has a wide range of applications in measuring the liquid material.The principle of work of traditional rotary-piston type flowmeters: flowmeter partly is made up of housing, piston mechanism etc.Counting mechanism is isolated with fluid lean on the magnetic transmission fully, when instrument inserts pipeline and has fuel oil to flow through, the pressure differential of importing and exporting both sides will promote piston and do gyration, the magnetic coupling that link to each other with piston this moment also rotates thereupon, because the rotating speed of piston is proportional to the oil mass that flows through instrument, so the piston revolution write down of counting mechanism promptly flows through the multiple of the oil mass of instrument.Wherein, the function of coupling mechanism is the movement locus and the counting of leading the control piston.This by coupling mechanism lead the control piston motion mode, coupling mechanism has increased the resistance of piston rotation, failure rate is higher.

Summary of the invention:

The purpose of this utility model is to overcome the deficiencies in the prior art, and a kind of simple in structure, rotary-piston type flowmeters that the measurement data precision is high is provided.

For achieving the above object, the technical scheme that the utility model provides is: a kind of rotary-piston type flowmeters, include by what closed shell constituted and have a measurement chamber into and out of hydraulic fluid port, and be located at piston in the measurement chamber, also be provided with the measurement chamber central shaft in the measurement chamber, form piston middle spindle on the piston, magnetic element is housed on the piston, when the piston crankmotion, piston middle spindle is along measurement chamber central shaft axial wall slip and circumscribed with the measurement chamber central shaft.

Described magnetic element is a magnet.

Described magnet is loaded on the top of piston middle spindle.

Described measurement chamber central shaft is positioned at the bottom or the top of measurement chamber.

Described piston middle spindle is positioned at lower part of piston or top.

The utility model and the contrast of traditional flowmeter have following advantage: 1, simple in structure: have only a movement parts in the measurement chamber of flowmeter, i.e. rotary-piston has deducted with piston and has been connected magnetic coupling.2, precision improves: because the magnetic coupling that is connected with piston in the prior art can bring frictional resistance to the piston rotation, deducted magnetic coupling, just reduced the resistance of piston rotation, improved the initiating of flowmeter effectively, improved the precision of flowmeter.

Description of drawings:

Fig. 1 is the utility model structural representation.

Embodiment:

Present embodiment includes by what closed shell constituted and has a measurement chamber 1 into and out of hydraulic fluid port, and be located at piston 2 in the measurement chamber 1, by respectively establishing appropriate measurement chamber central shaft 11 of a diameter and piston middle spindle 21 in measurement chamber 1 and piston 2, come the rotational trajectory of control piston 2 with measurement chamber central shaft 11 and piston middle spindle 21, wherein, measurement chamber central shaft 11 can be arranged on the bottom or the top of measurement chamber, piston middle spindle 21 can be arranged on lower part of piston or top, and purpose all is the movement locus of leading control piston 2.When piston 2 crankmotions, piston middle spindle 21 will be along measurement chamber central shaft 21 axial walls slip and mutually circumscribed with measurement chamber central shaft 11, so just can lead the movement locus of control piston 2, make the axle center (or central axis) of piston thus doing circulatory motion makes piston 2 rotation.Magnet 3 (magnetic element) directly is embedded in piston middle spindle 21 tops, and when piston 2 rotatablely moved, the magnetic line of force saw through housing, triggered electronic signal, or had been with counting mechanism to rotate, thereby realized counting.

The embodiment of the above is preferred embodiment of the present utility model only, is not to limit practical range of the present utility model with this, so the equivalence that all shapes according to the utility model, structure and principle are done changes, all should be covered by in the protection domain of the present utility model.

Claims

1, a kind of rotary-piston type flowmeters, include by what closed shell constituted and have a measurement chamber (1) into and out of hydraulic fluid port, and be located at piston (2) in the measurement chamber (1), it is characterized in that: also be provided with measurement chamber central shaft (11) in the measurement chamber (1), form piston middle spindle (21) on the piston (2), magnetic element (3) is housed on the piston (2), when the piston crankmotion, piston middle spindle (21) is along measurement chamber central shaft (11) axial wall slip and circumscribed with measurement chamber central shaft (11).

2, a kind of rotary-piston type flowmeters according to claim 1 is characterized in that: described magnetic element (3) is a magnet.

3, a kind of rotary-piston type flowmeters according to claim 2, it is characterized in that: described magnet is loaded on the top of piston middle spindle (21).

4, a kind of rotary-piston type flowmeters according to claim 1 is characterized in that: described measurement chamber central shaft (11) is positioned at the bottom or the top of measurement chamber.

5, a kind of rotary-piston type flowmeters according to claim 1 is characterized in that: described piston middle spindle (21) is positioned at lower part of piston or top.