CN1202618A

CN1202618A - Axial flow type gas meter

Info

Publication number: CN1202618A
Application number: CN 97105132
Authority: CN
Inventors: 林迎
Original assignee: SHITAI COUNTY GAS INSTRUMENTS AND METERS GENERAL FACTORY ANHUI PROV
Current assignee: SHITAI COUNTY GAS INSTRUMENTS AND METERS GENERAL FACTORY ANHUI PROV
Priority date: 1997-06-17
Filing date: 1997-06-17
Publication date: 1998-12-23

Abstract

The gas meter mainly consists of casing, rotating vane wheel, speed reducer and counter, and it features its miniflow start passage and main passage between the gas inlet and the rotor cavity. There is in the main passage one pressure control valve comprising crown valve sheet in the main passage and spring inside the crown valve sheet.

Description

Axial flow type gas meter

The present invention relates to a kind of gas meter, a kind of device that passes through the fluid flow of instrument continuously of measuring, particularly a kind of impact type gas meter with rotating vane is mainly used in the flow of measuring inflammable gas.

The existing instrument of inflammable gas flow of measuring is by use occasion or environment branch, can be divided into industrial table and family expenses table, industrial table mainly contains that waist is wheeled, roots-type and iris type three kinds, mainly there is following some deficiency in these three kinds of instrument: 1. the friction force between the kinematic pair is big, measuring accuracy is low, and error in dipping is generally ± and 5%; 2. the low discharge startability is poor, should not make the family expenses table of low discharge; 3. complex structure, cost height.The family expenses table mainly is the epithelium formula, this table is to utilize the to-and-fro movement that flexural deformation produces of rubber diaphragm to promote integrator to measure, because rubber diaphragm remarkable variation of elasticity under low temperature environment, even follow the string, therefore only be applicable to environment temperature indoor more than 10 degree Celsius.In addition, no matter be industrial table or family expenses table, all there is not reverse checkvalve, therefore can not gas-robbery resistence, can not prevent with the tempering in the gas process.

In view of there are above-mentioned many deficiencies in prior art, order of the present invention is to disclose a kind of high-precision axial flow type gas meter, and the low discharge startability of this table is good, the precision height, both be suitable for the indoor use more than 15 degree Celsius, also be suitable for the open air use below 15 degree Celsius.

The present invention realize the above-mentioned purpose technical solution mainly be in the formed cavity rotary blade is set in housing and the case, the reduction gear sum counter constitutes, it is characterized in that being provided with between air intake opening and the rotor chamber trace and start passage and main channel, be provided with pressure control valve in this main channel, described pressure control valve is that crown valve block is set in the main channel, is provided with in the hat of crown valve block that spring constitutes.When just air feed or air feed air pressure when low, be that supply gas pressure is not when reaching the opening pressure of pressure control valve set in the main channel, combustion gas directly starts in the passage from trace sprays to rotary blade, make rotary blade obtain to start required kinetic energy, when the air feed pressure reached set pressure, pressure control valve set in the main channel promptly was open, and combustion gas is just sprayed to rotary blade in the main channel, promote rotary blade with higher speed rotation, and the high more rotating speed of supply gas pressure is fast more.Therefore technical solution of the present invention has following outstanding advantage and significant effect than prior art:

1. utilize the momentum of air-flow to promote rotary blade, do not have friction between rotary blade and the housing, highly sensitive, the low discharge startability is good, starts flow≤5/1000;

2. measuring accuracy height, precision can reach ± and 0.5%;

3. the environment for use temperature is not had specific (special) requirements, both be suitable for the indoor use more than 10 degree Celsius, be suitable for the open air use below 10 degree Celsius yet;

4. usable range is wide, both can make industrial table, also can make utility meters;

5. owing to set pressure control valve in the main channel, existing big flow transformation has non-return effect again, therefore can not only gas-robbery resistence and energy anti-backfire (be communicated with air intake opening although trace starts passage, its return-air amount does not reach the concentration of lighting a fire).

Below in conjunction with drawings and Examples the present invention is explained in further detail,, grasps better and implement technological means of the present utility model so that the public fully understands purpose of the present invention.

Fig. 1 and Fig. 2 are the structural representation after a most preferred embodiment of the present invention is laid down case 2, and Fig. 1 is a front view, and Fig. 2 is a right view;

Fig. 3 is the A--A cut-open view of Fig. 1;

Fig. 4 and Fig. 5 are the contour structures synoptic diagram of embodiment illustrated in figures 1 and 2, and Fig. 4 is a front view, and Fig. 5 is a vertical view;

Fig. 6 is the working state figure of axial flow type gas meter of the present invention, demonstrates the shoulder state of opening of main channel 40 and pressure control valve among the figure.

Referring to Fig. 1 and Fig. 3, an important additional technical feature of the present invention is to be provided with between air intake opening and the rotor chamber dividing plate 4, this dividing plate 4 is provided with micropore nozzle 7 and 3～5 and the main channel 40 (present embodiment is three) that starts channel connection 39 with trace, the main burner 6 (referring to Fig. 6) of connection.Because axial flow type gas meter described in the utility model is to utilize air-flow that the impulsive force of rotary blade 23 is promoted, so air-flow directly influences the accuracy of metering to the application point of rotary blade 23.So dispose the direction of each nozzle when the purpose of this additional technical feature of the present invention is to make according to the specification of table, select air-flow to be sprayed onto the application point of rotary blade 23, make rotary blade 23 obtain suitable rotating torque, further improve measuring accuracy.

Referring to Fig. 1 and Fig. 3, be provided with air inlet/outlet in housing 1 body, housing 1 is provided with sealing gasket 25 and dividing plate 4 separates air intake opening and rotor chamber; The front end of air intake opening is by being communicated with for trace starts passage 39 that micropore spray 7 is communicated with rotor chamber; What the pressure control valve that the rear end of air intake opening constitutes via crown valve block 36 and spring 8 and three main burners 6 were communicated with rotor chamber is main channel 40; The center of rotary blade 23 is provided with axle sleeve 20, is set on the impeller shaft 21, and impeller shaft 21 is supporting by being located at jewel bearing 38 on the bearing seat 9 and the adjustable bearing split bearing 15 that is located on the support plate 13.Reduction gear described in the utility model is made up of driving gear 17 follower gears 18, worm screw 19 and the worm gear 28 that are located between clamping plate 5 and the bearing 3; Impeller shaft 21 passes through clamping plate 5, and driving gear 17 is located at its higher authorities, and follower gear 18 and worm screw 19 are located on the worm shaft 22, and two is being supported by bearing seat 10 and adjustable bearing split bearing 11 up and down, and worm gear 28 is bearing on the wallboard at counter 16 two; Counter 16 is fixed on the bearing 3 by screw 31 by pressing plate 24; The counter wheel of counter 16 is clamped between two wallboards, is connected and fixed with screw 34 by yoke plate 27 and is in the same place.Described dividing plate 4 is fixed on the housing 1 by screw 30, and clamping plate 5 are fixed on the dividing plate 4 by screw 32.Referring to Fig. 4 and Fig. 5, be provided with sealing gasket 26 between housing 1 and the case 2, be connected and fixed with nut 35 by screw 29 and be in the same place; The upper end of case 2 is provided with transparent face mask 37.

Claims

1. axial flow type gas meter, mainly be in housing (1) and case (2), in the formed cavity rotary blade (23) is set, reduction gear (17,18,19,28) sum counters (16) constitute, it is characterized in that being provided with between air intake opening and the rotor chamber trace and start passage (39) and main channel (40), be provided with pressure control valve in this master is logical, described pressure control valve is that crown valve block (36) is set in the main channel, is provided with in the hat of crown valve block (36) that spring (8) constituted.

2. a kind of axial flow type gas meter according to claim 1, it is characterized in that being provided with between air intake opening and the rotor chamber dividing plate (4), this dividing plate (4) is provided with trace and starts micropore nozzle (7) and 3～5 main burners (6) that are communicated with main channel (40) that passage (39) is communicated with.