CN2700851Y

CN2700851Y - Accuracy adjusting mechanism for membrane type gas meter

Info

Publication number: CN2700851Y
Application number: CN 200420034651
Authority: CN
Inventors: 孟黎
Original assignee: Qianwei Kromschroder Meters Chongqing Co ltd
Current assignee: Qianwei Kromschroder Meters Chongqing Co ltd
Priority date: 2004-04-30
Filing date: 2004-04-30
Publication date: 2005-05-18
Anticipated expiration: 2014-04-30

Abstract

The utility model relates to an accuracy adjusting mechanism for membrane type gas meters, which is characterized in that the utility model comprises a dial, a pointer and a hollow cam axle with two cams. The cam axle is provided with a gear, and the dial provided with a connecting rod hinge pin is movably sheathed on the cam axle through a central through hole arranged on the dial. A rotator on the pointer is movably inserted in an adjusting through hole on the dial. The dial and the cam axle are axially limited with each other through a fan-shaped flange on the rotator and a notch which is matched with the flange and arranged on the cam axle. A toggle pin arranged at the eccentric center of the rotator is inserted into a regulating rabbet of one cam. The utility model has the advantages of simple structure, easy assembly, low repair cost, reliable operation, etc. The slope rate of the deviation curve generated by the assembled gas meter can be adjusted freely by the utility model, so that the measuring accuracy of the gas meter is improved and the accuracy reaches to +-1.0%. The dispersibility of the error of the gas meter is reduced.

Description

Be used for the precision governor motion on the deaphragm gas meter

(1), affiliated technical field

The utility model relates to a kind of precision adjusting device of product, particularly a kind of device that is used to regulate the deaphragm gas meter precision.

(2), technical background

Existing deaphragm gas meter movement is general main to be made up of parts such as rocking arm, connecting rod, crank, diaphragm, metering shells.During the diaphragm to-and-fro movement of deaphragm gas meter movement, drive part movement such as rocking arm, connecting rod, crank, various moving wheels are turned to circular motion,, pass to counter by the driving lever output movement on the crank by linkage assembly; Air-channel system continuously distributes by parts such as valve grid, valve gap, escape pipe, joints and exports gas simultaneously, finally reaches the purpose of metering.The measuring accuracy of this deaphragm gas meter movement is to lean on the accuracy of diaphragm revolution volume to guarantee, because diaphragm is a rubber parts, the gas volume that the every revolution of diaphragm is once discharged during to-and-fro movement can only be controlled by the height and position of convex closure on the metering shell, in case the movement assembling finishes, the gas volume value that the every revolution of diaphragm is once discharged during to-and-fro movement is exactly a fixed value, that is to say, its precision just is determined, and can't adjust, generally promptly, its 0.2Qmax～Qmax graph of errors as shown in the figure, in case movement assembles, the slope of this graph of errors just is fixed, and can't adjust.So, manufacturer in process of production, in case it is bad to influence the correlated parts control of diaphragm revolution volume, the gas meter precision will reduce greatly, and can't remedy, before gas meter dispatches from the factory, the limits of error according to national Specification is changed the tooth adjustment to gas meter, have to do degradation sale and use to not satisfying high-precision gas meter, under from national B (± 1.5%) level, come down to A (± 2%) level,, can only do over again or scrap for the gas meter that does not reach A level table standard, this has just wasted limited resources greatly, has also increased the manufacturing cost of enterprise.

(3), summary of the invention

The purpose of this utility model just provides a kind of precision governor motion that is used on the deaphragm gas meter simple in structure and easy to use, it can be after the assembling of gas meter movement finishes, slope to the graph of errors of its generation is arbitrarily adjusted, to improve the gas meter precision, reduce the dispersiveness of gas meter error.

The purpose of this utility model is to realize by such technical scheme, it includes needle dial, pointer and the camshaft that has the hollow of two cams, camshaft is provided with gear, the needle dial that is provided with the rod hinge connection pin by the central through hole kink on it on camshaft, rotor on the pointer inserts on the adjusting through hole on the needle dial versatilely, come axial limiting each other by fan-shaped flange on the rotor and the breach that is arranged on the camshaft with matching between needle dial and the camshaft, be arranged at the stirring in the adjusting notch that pin inserts in a cam of eccentric part of rotor.

The utility model has substituted the crank in original technology fully, it is to be installed in like this on the gas meter movement: camshaft is placed on the axis of gas meter movement versatilely, two rocking arms are hinged by the rod hinge connection pin on connecting rod and the needle dial, the front and back control lever that connects with two valve gaps is connected with camshaft by two cams on the camshaft respectively, and two control lever respectively with movement on reference column hinged, the engagement of the gear on the camshaft and the outlet on movement wheel.Principle of work of the present utility model is such: after the assembling of gas meter movement finishes, stir the pointer on the needle dial, make between the rotor of pointer and the needle dial and relatively rotate, the pin of stirring on the rotor drives cam and makes and between camshaft and the needle dial relative revolving taken place and move by regulating notch, this revolves to move makes to pass through cam, the front and back control lever makes the moving range of valve gap on the valve grid take place to change relatively, thereby control the relative time of four valve grid mouths opening and closing, reach the purpose of adjusting the graph of errors slope, and reduced the dispersiveness of gas meter movement error, to improve the precision of product.

Owing to adopted technique scheme, the utlity model has simple in structure, assembling easily, reprocess advantage such as the low and reliable operation of cost, it can arbitrarily be adjusted the gas meter institute generated error slope of a curve that assembling finishes, to improve the gas meter precision, its precision reaches ± and 1.0%, and reduce the dispersiveness of gas meter error.

(4), description of drawings

Description of drawings of the present utility model is as follows:

Fig. 1 is a structural representation of the present utility model;

Fig. 2 is the structural representation of pointer;

Fig. 3 is the upward view of Fig. 2;

Fig. 4 is the structural representation of needle dial;

Fig. 5 is the vertical view of Fig. 4;

Fig. 6 is the structural representation of camshaft;

Fig. 7 is the vertical view of Fig. 6;

Fig. 8 is the annexation figure of the utility model and gas meter movement;

Fig. 9 is the error curve diagram after the assembling of gas meter movement in the prior art;

Figure 10 is the graph of errors comparison diagram of the utility model before and after the gas meter movement is adjusted.

Among the figure: 1. needle dial; 2. pointer; 3. cam; 4. camshaft; 5. gear; 6. rod hinge connection pin; 7. central through hole; 8. rotor; 9. adjusting through hole; 10. fan-shaped flange; 11. breach; 12. stir pin; 13. adjusting notch; 14. rocking arm; 15. connecting rod; 16. valve gap; 17. front and back control lever; 18. reference column; 19. valve grid; 20. the graph of errors before adjusting; 21. the graph of errors after regulating.

(5), embodiment

The utility model is described in further detail below in conjunction with drawings and Examples:

As shown in Figure 1, the utility model includes needle dial 1, pointer 2 and the camshaft 4 that has the hollow of two cams 3, in conjunction with Fig. 2,3,4,5,6,7 as can be known, camshaft 4 is provided with gear 5, the needle dial 1 that is provided with rod hinge connection pin 6 by central through hole 7 kinks on it on camshaft 4, rotor 8 on the pointer 2 inserts on the adjusting through hole 9 on the needle dial 1 versatilely, come axial limiting each other by fan-shaped flange 10 on the rotor 8 and the breach 11 that is arranged on the camshaft 4 with matching between needle dial 1 and the camshaft 4, be arranged at the stirring in the adjusting notch 13 that pin 12 inserts in a cam 3 of eccentric part of rotor 8.

The utility model has substituted the crank in original technology fully, as shown in Figure 8, it is to be installed in like this on the gas meter movement: camshaft 4 is placed on the axis of gas meter movement versatilely, two rocking arms 14 are hinged with the rod hinge connection pin 6 on the needle dial 1 by connecting rod 15, the front and back control lever 17 that connects with two valve gaps 16 is connected with camshaft 4 by two cams 3 on the camshaft 4 respectively, and two front and back control lever 17 respectively with movement on reference column 18 hinged, the outlet wheel engagement on gear on the camshaft 45 and the movement.Principle of work of the present utility model is such: after the assembling of gas meter movement finishes, stir the pointer 2 on the needle dial 1, make between the rotor 8 of pointer 2 and the needle dial 1 and relatively rotate, the pin 12 of stirring on the rotor 8 drives cams 3 relative the revolving of generation is moved by regulating notch 13, this revolves to move does by cam 3, front and back control lever 17 makes the moving range of valve gap 16 on valve grid 19 take place to change relatively, thereby control the relative time of 19 mouthfuls of opening and closing of four valve grid, reach the purpose of adjusting the graph of errors slope, it adjusts the result as shown in figure 10, and reduced the dispersiveness of gas meter movement error, to improve the precision of product.

Claims

1. precision governor motion that is used on the deaphragm gas meter, it is characterized in that: it includes needle dial (1), pointer (2) and have the camshaft (4) of the hollow of two cams (3), camshaft (4) is provided with gear (5), the needle dial (1) that is provided with rod hinge connection pin (6) by central through hole (7) kink on it on camshaft (4), rotor (8) on the pointer (2) inserts on the adjusting through hole (9) on the needle dial (1) versatilely, come axial limiting each other by fan-shaped flange (10) on the rotor (8) and the breach (11) that is arranged on the camshaft (4) with matching between needle dial (1) and the camshaft (4), be arranged at the stirring in the adjusting notch (13) that pin (12) inserts in a cam (3) of eccentric part of rotor (8).