CN101614397B

CN101614397B - Combined mechanical pressure release anti-backfire device

Info

Publication number: CN101614397B
Application number: CN2009100900930A
Authority: CN
Inventors: 吕新民; 杜海涛; 陈姚建平
Original assignee: BEIJING HEHUA ANJI ELECTRIC TECHNOLOGY INSTITUTE
Current assignee: Nanjing crane Energy Technology Co., Ltd.
Priority date: 2009-07-27
Filing date: 2009-07-27
Publication date: 2011-01-05
Anticipated expiration: 2029-07-27
Also published as: CN101614397A

Abstract

The invention provides a combined mechanical pressure release anti-backfire device, comprising an inlet pipe, a housing, an elasticity film, a fire stopping pipe, a connecting piece, a spacer and a mechanical pressure release valve, wherein, the fire stopping pipe is fixedly connected with the connecting piece, and the connecting piece and the fire stopping pipe are installed on the step hole end surface in the housing in an abutting mode by the spacer sheet of the inlet pipe; the elasticity film is sheathed on gas discharging through holes of each line of the inlet pipe which is fixedly connected in the housing by threads; the mechanical pressure release valve is installed on the upper end of the vertical through hole on the housing by threads. The invention can use the fire stopping pipe to cut off or extinguish the fire entering the inner cavity when the backfire phenomenon appears; at the same time, pressure wave passes through the inner cavity of the fire stopping pipe before deflagration fire to quickly push inwards, inner cavity pressure raises to cause the elasticity film to perform functions so as to cut off a gas loop; simultaneously, protective pressure release is carried out by the mechanical pressure release valve when the inner cavity pressure raises to a set safe value to release high pressure produced by backfire, so that the invention can effectively ensure the safety of the device and prevent the backfire phenomenon from damaging devices.

Description

Combined mechanical pressure release anti-backfire device

Technical field

The present invention relates to a kind of backfire controller, relate in particular to a kind of combined mechanical pressure release anti-backfire device, belong to mechanical structure field.

Background technology

At present, generally used a kind of mechanical type backfire controller pressure relief device when carrying out metal gas welding, cutting, flowed back to the blast that gas source causes equipment to stop flame with flame.Thereby the structure of this backfire controller and principle are the explosive force that produces during by tempering to be promoted piston, spring, valve rod and closes air inlet and block gas return path.But because temperature is higher, easily make spring produce annealing in this device, lose elasticity, cause fault.If easier being corroded when meeting corrosive liquids or gas and lose spring function, thereby make the disabler of temper device; Existing a kind of elastic membrane type tempering preventing device with fire-stopping pipe can effectively block the loop of tempering gas and stop the detonation of flame at device interior, but device interior bad student's in the short time pressure can't be removed.

Summary of the invention

The invention provides a kind of combined mechanical pressure release anti-backfire device; by adopting being used in combination of fire-stopping pipe and mechanical pressure relief; can stop flame to flow backwards reliably; mechanical pressure release valve will be carried out the protectiveness pressure release when fire-stopping pipe chamber pressure was elevated to setting ground safety value; the high pressure that the tempering of releasing produces, thereby the safety of assurance operating equipment.

A kind of combined mechanical pressure release anti-backfire device, comprise air inlet pipe, shell, the elastic force film, fire-stopping pipe, connector, pad and mechanical pressure release valve, air inlet pipe is the circular metal structure, variation according to external diameter, as seen air inlet pipe is divided into 4 stages, the section of stretching out EA, left side section AB, stage casing BC, right section CD, wherein the external diameter of left side section AB is greater than the external diameter of right section CD, and the external diameter of right section CD is greater than the external diameter of stage casing BC and less than the internal diameter of shell, and the air inlet pipe on the BC of stage casing circumferentially has the vent hole that goes out more than two row along axis direction, whenever listing the vent hole number is more than two, go out the inside and outside wall that vent hole runs through air inlet pipe, have blind hole on the air inlet pipe axis direction, the length of this blind hole runs through left side section AB and stage casing BC; Shell is round tubular metal three-way pipe, inner have through hole along the horizontal axis direction, there is a step at through hole 2/3rds places, the through-hole aperture of left end is less than the through-hole aperture of right-hand member, the through-hole wall of left end is processed with one section screw thread, on the stepped hole through hole vertical direction through hole is arranged, all be processed with one section screw thread on through hole upper end inwall and the cylindrical; The mechanical pressure release valve construction profile is circular tubbiness housing, lower end at vertical direction is processed with external screw thread, inwall has the type conical bench hole, and relief valve is by the compression spring of its upper end and the cone match in bolt compressing and type conical bench hole, and the housing of mechanical pressure release valve circumferentially has the steam vent of perforation; Its annexation is: fire-stopping pipe is fixedlyed connected with connector, and connector and fire-stopping pipe are conflicted by air inlet pipe dottle pin sheet and be installed on the stepped hole end face of enclosure; The section of the stretching out EA of air inlet pipe is positioned at outside the shell (2), and a left side section AB, the stage casing BC of air inlet pipe, right section CD are arranged in the through hole of shell, and the elastic force Membrane cover is connected on the BC external diameter of stage casing, and air inlet pipe is connected in enclosure; The external diameter of right section CD and the internal diameter matched in clearance of shell; Mechanical pressure release valve is installed in through hole upper end on the shell vertical direction by screw thread.

When the gas from source of the gas arrives suction nozzle, when pressure reaches certain value the elastic force film is propped up, gas enters solder cutting gun by the through hole of venthole on fire-stopping pipe and connector and lights work, in a single day in when, tempering taking place in the course of work when, at first detonation and inwardly propelling rapidly in tube chamber of flame, by fire-stopping pipe the time, be blocked or extinguish, thereby the pressure that detonation simultaneously produces makes the elastic force film and goes out vent hole and be adjacent to and block gas return path prior to flame; Because inside cavity can produce the pressure of moment, when pressure surpasses certain limit, the relief valve on the mechanical pressure release valve will be backed down under pressure, and pressed gas will be by the row of the pore on the mechanical pressure release valve to the outside; The force value that mechanical pressure release valve is opened can be by adjusting the tension force decision that bolt changes the compression spring.

Beneficial effect: tempering phenomenon can be when taking place in the present invention, by fire-stopping pipe blocking-up or extinguish the flame that enters inner chamber, pressure wave inwardly advances rapidly through the fire-stopping pipe inner chamber prior to the flame of detonation simultaneously, the chamber pressure rising causes the elastic force film to play a role and blocks gas return path, mechanical pressure release valve will be carried out the protectiveness pressure release when chamber pressure was elevated to setting ground safety value simultaneously, discharged the high pressure that tempering produces; Thereby effectively guarantee the security of equipment and prevent the infringement of tempering phenomenon equipment.

Description of drawings

Fig. 1 is the structural representation of a kind of combined elastic film pressure release anti-backfire device of the present invention

Wherein: 1-air inlet pipe, 2-fire-stopping pipe, 3-shell, 4-mechanical pressure release valve, 5-connector, 6-pad

The specific embodiment

The present invention will be further described below in conjunction with accompanying drawing

As shown in Figure 1, a kind of combined mechanical pressure release anti-backfire device, comprise air inlet pipe 1, shell 3, the elastic force film, fire-stopping pipe 2, connector 5, pad 6 and mechanical pressure release valve 4, wherein air inlet pipe 1 is the circular metal structure, variation according to external diameter, as seen air inlet pipe 1 is divided into 4 stages, the section of stretching out EA, left side section AB, stage casing BC, right section CD, wherein, the external diameter of left side section AB is greater than the external diameter of right section CD, and the external diameter of right section CD is greater than the external diameter of stage casing BC and less than the aperture of shell 3, the air inlet pipe 1 on the BC of stage casing circumferentially along axis direction have four row uniform go out vent hole 4, whenever listing vent hole 4 numbers is three, go out the inside and outside wall that vent hole 4 runs through air inlet pipe, have blind hole on the air inlet pipe axis direction, the length of this blind hole runs through left side section AB and stage casing BC; Shell 3 is round tubular metal three-way pipe, inner have through hole along the horizontal axis direction, there is a step at through hole 2/3rds places, the through-hole aperture of left end is less than the through-hole aperture of right-hand member, the through-hole wall of left end is processed with one section screw thread, one through hole is arranged on the vertical direction of shell 3, all be processed with one section screw thread on through hole upper end inwall and the cylindrical; Mechanical pressure release valve 4 construction profile are circular tubbiness housing, lower end at vertical direction is processed with external screw thread, inwall has the type conical bench hole, and relief valve is by the compression spring of its upper end and the cone match in bolt compressing and type conical bench hole, and the housing of mechanical pressure release valve 4 circumferentially has the steam vent of perforation; Its annexation is: fire-stopping pipe 2 is fixedlyed connected with connector 5, and connector 5 and fire-stopping pipe 2 are conflicted by air inlet pipe 1 dottle pin sheet 6 and be installed on the stepped hole end face of shell 3 inside; The elastic force Membrane cover is connected on the BC external diameter of stage casing, and air inlet pipe 1 is connected in shell 3 inside by screw thread; Mechanical pressure release valve 4 is installed in through hole upper end on shell 3 vertical directions by screw thread.

When the gas from source of the gas arrives air inlet pipe 1, when pressure reaches certain value the elastic force film is propped up, gas enters solder cutting gun by the through hole of venthole on fire-stopping pipe 2 and connector 5 and lights work, in a single day in when, tempering taking place in the course of work when, at first detonation and inwardly propelling rapidly in tube chamber of flame, by fire-stopping pipe the time, be blocked or extinguish, thereby the pressure that detonation simultaneously produces makes the elastic force film and goes out vent hole and be adjacent to and block gas return path prior to flame; Because inside cavity can produce the pressure of moment, when pressure surpasses certain limit, the relief valve on the mechanical pressure release valve 4 will be backed down under pressure, and pressed gas will be by the row of the pore on the mechanical pressure release valve 4 to the outside; The force value that mechanical pressure release valve 4 is opened can be by adjusting the tension force decision that bolt changes the compression spring.

Claims

1. combined mechanical pressure release anti-backfire device, comprise air inlet pipe (1), shell (3), the elastic force film, fire-stopping pipe (2), connector (5), pad (6) and mechanical pressure release valve (4), it is characterized in that: air inlet pipe (1) is the circular metal structure, variation according to external diameter, as seen air inlet pipe (1) is divided into 4 stages, the section of stretching out EA, left side section AB, stage casing BC, right section CD, wherein the external diameter of left side section AB is greater than the external diameter of right section CD, the external diameter of right section CD is greater than the external diameter of stage casing BC and less than the aperture of shell (3), the plural vent hole that goes out is arranged on the air inlet pipe on the BC of stage casing (1) wall, have blind hole on the air inlet pipe axis direction, the length of this blind hole runs through left side section AB and stage casing BC; Shell (3) is round tubular metal three-way pipe, inner have through hole along the horizontal axis direction, there is a step at through hole 2/3rds places, the through-hole aperture of left end is less than the through-hole aperture of right-hand member, the through-hole wall of left end is processed with one section screw thread, on the vertical direction of shell (3) through hole is arranged, all be processed with one section screw thread on through hole upper end inwall and the cylindrical; Mechanical pressure release valve (4) construction profile is circular tubbiness housing, lower end at vertical direction is processed with external screw thread, inwall has the type conical bench hole, relief valve is by the compression spring of its upper end and the cone match in bolt compressing and type conical bench hole, and the housing of mechanical pressure release valve (4) circumferentially has the steam vent of perforation; Its annexation is: fire-stopping pipe (2) is fixedlyed connected with connector (5), and connector (5) and fire-stopping pipe (2) are conflicted by air inlet pipe (1) dottle pin sheet (6) and be installed on the inner stepped hole end face of shell (3); The section of the stretching out EA of air inlet pipe (1) is positioned at outside the shell (3), a left side section AB, the stage casing BC of air inlet pipe (1), right section CD are arranged in the through hole of shell (3), the elastic force Membrane cover is connected on the BC external diameter of stage casing, air inlet pipe (1) is connected in shell (3) inside, the external diameter of right section CD and the internal diameter matched in clearance of shell (3); Mechanical pressure release valve (4) is installed in through hole upper end on shell (3) vertical direction by screw thread.

2. combined mechanical pressure release anti-backfire device as claimed in claim 1 is characterized in that: the vent hole that goes out on the air inlet pipe (1) is arranged along air inlet pipe (1) axis direction, and number is more than two row, whenever lists the vent hole number more than two.

3. combined mechanical pressure release anti-backfire device as claimed in claim 1 is characterized in that: the force value that mechanical pressure release valve (4) is opened, and by adjusting the tension force decision that bolt changes the compression spring.