CN212003368U

CN212003368U - Low-pressure gas pressure adjusting device

Info

Publication number: CN212003368U
Application number: CN202020712196.8U
Authority: CN
Inventors: 苗龙森; 李庆飞; 莫员; 王家祥; 吕立强; 盘子林
Original assignee: Guangxi Yuchai Machinery Co Ltd
Current assignee: Guangxi Yuchai Marine and Genset Power Co Ltd
Priority date: 2020-04-30
Filing date: 2020-04-30
Publication date: 2020-11-24
Anticipated expiration: 2030-04-30

Abstract

The utility model discloses a low pressure gas pressure adjusting device relates to low pressure gas control, solves current regulation admission valve group and has the inconvenient technical problem of regulation to the admission pressure that approaches to 0kPa, adjusting device includes manual valve, gas filter, manometer, low pressure electromagnetism trip valve, spark arrester, air-vent valve that connect gradually through the pipeline, and its characterized in that is equipped with pressure measurement on the pipeline of air-vent valve output, and pressure measurement includes transparent U type pipe, the scale that corresponds with U type pipe and is used for installing the support of U type pipe, scale, and the connecting pipe connecting tube is passed through to the one end of U type pipe, and the other end communicates with the atmosphere, and U type intraductal liquid medium that is equipped with. The utility model discloses a set up the U type pipe of being connected with the pipeline, at the intraductal liquid medium that sets up of U type, the difference in height according to liquid medium in U type pipe both ends detects out admission pressure and adjusts the air-vent valve and obtain target pressure, adjusts convenience, precision height.

Description

Low-pressure gas pressure adjusting device

Technical Field

The utility model relates to a low pressure gas control, more specifically say, it relates to a low pressure gas pressure regulating device.

Background

An air inlet valve group of the existing low-pressure gas control system is shown in fig. 1 and comprises a manual valve B, a gas filter C, a front pressure gauge D, a low-pressure electromagnetic cut-off valve E, a flame arrester F, a pressure regulating valve G and a rear pressure gauge H which are sequentially connected through a pipeline A, wherein the requirement of the air inlet pressure of the air inlet valve group is 15-30 kPa, the air outlet pressure of the air inlet valve group generally approaches to 0kPa (usually-0.5-2 kPa) and the pressure is lower, and the requirement is realized by regulating the pressure regulating valve G on the air inlet valve group. The gas after passing through the gas inlet valve group enters the electric control mixer, the concentration of the target mixed gas is realized through pulse spectrum calibration of the opening of the electric control mixer, and tests show that different gas outlet pressures are sensitive to the concentration of the mixed gas, and faults of incapability of starting a new engine under the same calibration data, rotation speed fluctuation after successful starting and the like can be caused by the pressure difference of 0.01kPa, so that the accurate regulation of the gas outlet pressure of the gas inlet valve group is very important.

At present, the same specification of the rear pressure gauge H as that of the front pressure gauge D is mostly adopted, the range is too large, the precision does not meet the requirement, the air outlet pressure is difficult to adjust to the target pressure, and the practicability is not strong. And a high-precision pressure gauge is adopted, so that the cost is high, the pressure gauge is easy to be damaged by flushing, and the failure rate is high.

SUMMERY OF THE UTILITY MODEL

The to-be-solved technical problem of the utility model is not enough to the above-mentioned of prior art, the utility model aims at providing a low pressure gas pressure regulating device that precision is high and convenient regulation.

The technical scheme of the utility model is that: the utility model provides a low pressure gas pressure adjusting device, includes manual valve, gas filter, manometer, low pressure electromagnetism trip valve, spark arrester, the air-vent valve that connect gradually through the pipeline, be equipped with pressure measurement on the pipeline of air-vent valve output, pressure measurement includes transparent U type pipe, with the scale that U type pipe corresponds and be used for installing the support of U type pipe, scale, the one end of U type pipe is passed through the connecting pipe and is connected the pipeline, and the other end communicates with the atmosphere, U type intraductal liquid medium that is equipped with.

As a further improvement, the support comprises a vertical rod and a base located at the lower end of the vertical rod, and a mounting plate used for mounting the U-shaped pipe and the scale is arranged on the vertical rod.

Further, the scale is located between the U-shaped pipe and the mounting plate.

Further, the length of the scale mark of the scale is larger than the width of the U-shaped pipe.

Further, the liquid medium is pure water, and the pipe diameter of the U-shaped pipe is larger than or equal to 8 mm.

Further, the liquid medium is mercury, and the pipe diameter of the U-shaped pipe is larger than or equal to 5 mm.

Furthermore, the connecting pipe is a flexible pipe, a connector is arranged on the pipeline, the connecting pipe is sleeved on the connector, and a hoop for locking the connecting pipe on the connector is arranged on the periphery of the connecting pipe.

Advantageous effects

Compared with the prior art, the utility model, the advantage that has does: the utility model discloses a set up the U type pipe of being connected with the pipeline, at the intraductal liquid medium that sets up of U type, detect out atmospheric pressure and adjust the air-vent valve according to the difference in height of liquid medium in U type pipe both ends and obtain target pressure, it is convenient, the precision is high to adjust.

Drawings

FIG. 1 is a schematic diagram of a conventional structure;

fig. 2 is a schematic structural diagram of the present invention.

Wherein: the device comprises a pipeline 1, a manual valve 2, a gas filter 3, a pressure gauge 4, a low-pressure electromagnetic cut-off valve 5, a flame arrester 6, a pressure regulating valve 7, a U-shaped pipe 8, a scale 9, a support 10, a connecting pipe 11, a liquid medium 12, a vertical rod 13, a base 14, a mounting plate 15, a connector 16, a hoop 17, a switch valve 18 and a counterweight 19.

Detailed Description

The invention will be further described with reference to specific embodiments shown in the drawings.

Referring to fig. 2, the low-pressure gas pressure regulating device comprises a manual valve 2, a gas filter 3, a pressure gauge 4, a low-pressure electromagnetic cut-off valve 5, a flame arrester 6 and a pressure regulating valve 7 which are sequentially connected through a pipeline 1. The pipeline 1 at the output end of the pressure regulating valve 7 is provided with a pressure detection device, and the pressure detection device comprises a transparent U-shaped pipe 8, a scale 9 corresponding to the U-shaped pipe 8 and a support 10 for mounting the U-shaped pipe 8 and the scale 9. One end of the U-shaped pipe 8 is connected with the pipeline 1 through a connecting pipe 11, the other end of the U-shaped pipe is communicated with the atmosphere, and a liquid medium 12 is arranged in the U-shaped pipe 8.

The support 10 comprises a vertical rod 13 and a base 14 located at the lower end of the vertical rod 13, a mounting plate 15 used for mounting the U-shaped pipe 8 and the scale 9 is arranged on the vertical rod 13, the scale 9 is located between the U-shaped pipe 8 and the mounting plate 15, the length of a scale mark of the scale 9 is larger than the width of the U-shaped pipe 8, and the height difference of liquid levels at two ends of the U-shaped pipe 8 can be compared conveniently. The liquid medium 12 may be pure water, mercury, or other liquid. Due to the tension action of the capillary and the liquid surface, the liquid surface in the U-shaped pipe 8 is crescent, errors are caused to the reading, in order to reduce the errors, the pipe diameter of the U-shaped pipe 8 cannot be selected to be too thin, and the pipe diameter of the U-shaped pipe 8 needs to be set according to a specific liquid medium 12. For example: when the liquid medium 12 is pure water, the pipe diameter of the U-shaped pipe 8 is more than or equal to 8 mm; when the liquid medium 12 is mercury, the diameter of the U-shaped pipe 8 is more than or equal to 5 mm.

Mounting panel 15 rotates through pivot and vertical pole 13 to be connected, and mounting panel 15's bottom is equipped with balancing weight 19, and balancing weight 19 is located U type pipe 8 under, and under the effect of gravity, balancing weight 19 can drive mounting panel 15 and remain vertical state throughout for when base 14 is located the inclined plane, U type pipe 8 also remain vertical state throughout, has effectively guaranteed the accuracy that detects.

The connecting pipe 11 is a flexible pipe, and the position of the pressure detection device can be conveniently arranged. The pipeline 1 is provided with a connector 16, the connecting pipe 11 is sleeved on the connector 16, and the periphery of the connecting pipe 11 is provided with a hoop 17 which locks the connecting pipe on the connector 16, so that the sealing property can be ensured. The connector 16 is provided with a switch valve 18, which can conveniently cut off the fuel gas of the connecting pipe 11 and the pipeline 1.

The working principle is as follows:

when no pressure difference exists between the two ends of the U-shaped pipe 8, the liquid levels at the two ends are equal. When the pressure difference exists, the liquid level difference h (mm) is generated at the two ends, and the outlet pressure of the pipeline 1 is obtained according to the measured pressure P ═ rho.g.h, wherein rho is the density (g/cm) of the liquid medium 12³) G is the local gravitational acceleration (m/s)²) Generally, 9.8 (m/s) is taken²). For the calibration data of a given version, the corresponding inlet pressure is constant, the specific value of the liquid level difference h between the two ends can be obtained through inverse calculation according to the pressure difference between the target outlet pressure and the inlet pressure, and the knob on the pressure regulating valve 7 is adjusted to enable the liquid level difference h between the two ends of the U-shaped pipe 8 to be equal, so that the target outlet pressure can be obtained.

The utility model detects the air pressure according to the height difference of the liquid medium 12 in the two ends of the U-shaped pipe 8, the detection precision is high, the precision can reach 0.01kPa, and the practicability is strong; when the target pressure needs to be adjusted, the target liquid level height difference at the two ends of the U-shaped pipe 8 is obtained through inverse calculation, the knob on the pressure regulating valve 7 is adjusted according to the target liquid level height difference to obtain the target pressure, and the adjustment is simple and convenient.

The above is only a preferred embodiment of the present invention, and it should be noted that for those skilled in the art, without departing from the structure of the present invention, several modifications and improvements can be made, which will not affect the utility of the invention and the utility of the patent.

Claims

1. The utility model provides a low pressure gas pressure adjusting device, includes manual valve (2), gas filter (3), manometer (4), low pressure electromagnetism trip valve (5), spark arrester (6), air-vent valve (7) that connect gradually through pipeline (1), its characterized in that, be equipped with pressure measurement on pipeline (1) of air-vent valve (7) output, pressure measurement includes transparent U type pipe (8), with scale (9) that U type pipe (8) correspond and be used for installing support (10) of U type pipe (8), scale (9), the one end of U type pipe (8) is passed through connecting pipe (11) and is connected pipeline (1), the other end and atmosphere intercommunication, be equipped with liquid medium (12) in U type pipe (8).

2. The low-pressure gas pressure regulating device according to claim 1, wherein the support (10) comprises a vertical rod (13) and a base (14) positioned at the lower end of the vertical rod (13), and a mounting plate (15) for mounting the U-shaped pipe (8) and the scale (9) is arranged on the vertical rod (13).

3. The low-pressure gas pressure regulating device according to claim 2, wherein the scale (9) is located between the U-tube (8) and the mounting plate (15).

4. A low pressure gas pressure regulating device according to claim 3, characterized in that the length of the graduation marks of the scale (9) is greater than the width of the U-shaped tube (8).

5. The low-pressure gas pressure regulating device as claimed in claim 1, wherein the liquid medium (12) is pure water, and the diameter of the U-shaped pipe (8) is greater than or equal to 8 mm.

6. A low pressure gas pressure regulating device according to claim 1, wherein the liquid medium (12) is mercury, and the diameter of the U-shaped tube (8) is not less than 5 mm.

7. The low-pressure gas pressure regulating device according to any one of claims 1 to 6, wherein the connecting pipe (11) is a flexible pipe, the pipeline (1) is provided with a connector (16), the connecting pipe (11) is sleeved on the connector (16), and the periphery of the connecting pipe (11) is provided with a hoop (17) for locking the connecting pipe (11) on the connector (16).