CN2341011Y

CN2341011Y - Explosive preventor for gas flashback

Info

Publication number: CN2341011Y
Application number: CN 97215576
Authority: CN
Inventors: 谷好和
Original assignee: Individual
Current assignee: Individual
Priority date: 1997-05-05
Filing date: 1997-05-05
Publication date: 1999-09-29
Anticipated expiration: 2007-05-05

Abstract

The utility model discloses a combustible gas backfire explosion stopping device which can prevent combustible gas bottles form generating explosion caused by backfire, comprising a shell body, an air blocking plug and a filter. The utility model is characterized in that the utility model is also provided with a supporting and pressing device composed of a spring and a post rod and a caging device composed of a positioning shaft and other parts, the post rod is in a retracting state towards a direction away from an air inlet opening under the normal condition, the spring is in a compressing state, and the position of the post rod is limited by a positioning rod of the caging device. When backfire is generated, the caging device is opened under the action of the pressure of high pressure gas, and the post rod forwards moves and supports and presses the air blocking plug under the action of the pressure of the spring for tightly closing the air inlet opening. When the utility model is realized, the utility model has the advantages of reliable closing, good explosion-proof performance, etc.

Description

A kind of combustible gas back-fire explosive preventor

The utility model relates to a kind of utensil that prevents flammable gas bottle explosion, exactly is that a kind of inflammable gas bottle that prevents is owing to the explosion caused combustible gas back-fire explosive preventor of tempering.

At present, people are utilizing the inflammable gas (gas that can burn, as acetylene) and the heat energy that produces of combustion-supporting gas (as oxygen) mixed combustion weld, cutting, employed equipment is by flammable gas cylinder (steel cylinder of splendid attire high pressure combustible gas) in the hot work operation processes such as preheating, combustion-supporting gas cylinder compositions such as (steel cylinders of the combustion-supporting gas of splendid attire high pressure), employed utensil comprises welding torch, cutting torch, the sebific duct that air guide is used, has the explosion-proof reduction valve of explosion prevention function etc., wherein explosion-proof reduction valve is made up of reduction valve and combustible gas back-fire explosive preventor, the bottleneck sealed attachment of this reduction valve suction port and flammable gas cylinder, the suction port sealed attachment of its air outlet and combustible gas back-fire explosive preventor; Above-mentioned sebific duct two ends respectively with gaseous combustion heat energy output utensil sealed attachment such as the air outlet of this combustible gas back-fire explosive preventor and above-mentioned welding torch or cutting torch; But above-mentioned burner back-fire explosive preventor is by tubular shell and be arranged on parts such as filter in this bright intracoelomic cavity, choke plug and form, this choke plug is mushroom, can move freely vertically, this choke plug can advance to its suction port one end under the effect of sebific duct inner high voltage gas pressure voluntarily when tempering takes place, the sealing inlet hole is to reach the purpose that the blocking-up inflammable gas prevents flammable gas bottle explosion.The major defect of this combustible gas back-fire explosive preventor is: to reduction valve air outlet bad sealing, and only can be in the moment sealing reduction valve air outlet that back draft takes place, and after back draft, bottle inner high voltage gas still can be pushed this choke plug open and freely export, secondary combustion takes place easily and cause flammable gas bottle explosion, thereby its explosion-proof performance is poor.

The purpose of this utility model is to provide a kind of inflammable gas back-fire explosive preventor that can form long-time reliable sealing to the reduction valve air outlet for people.

The purpose of this utility model is to realize like this, it comprises housing, choke plug, tubular filter, be characterized in: described housing is made up of right shell body 11, left shell 10 and upper shell 12, be shaped on vertical, level two holes in this right shell body 11, this horizontal hole by from left to right, aperture tapped hole A, macropore B, mesopore C, each coaxial aperture of aperture D from large to small constitute this mesopore C and aperture D conical surface transition; This upright opening is to be made of than small through hole upper end diameter bigger tapped hole and lower end diameter, and the aperture of this lower end through hole and described mesopore C join; Described left shell 10 profiles are the multidiameter shaft shape, be shaped on ladder hole in the body, its big bore dia is greater than macropore B diameter in the described right shell body 11, and this nose end cylindrical is made the outside thread that is complementary with described right shell body 11 interior threaded hole A, and described left and right housing connects by this thread seal; Described upper shell 12 is the tubular bodies that are shaped on shoulder hole in the individuality, is shaped on the outer convex body of ring-type in its lower end macropore, and this end cylindrical is shaped on screw thread, and it is by this screw thread and described right shell body 11 upper end snail pit sealed attachment; A middle part is shaped on the axle shape push rod 5 of shoulder, be installed on mesopore C left part in the described right shell body 11 by this shoulder cylindrical, both are slidingly matched, this shoulder left side is by ring washer 4 a backstops location that is installed in macropore B bottom in the described right shell body 11, and this shoulder right side is stretched in the aperture, lower end of described right shell body 11 upright openings; The end plate 8 of radial dimension less than this aperture is equipped with at macropore interior edge face place in the bright body 10 in a described left side, and both are provided with vent slot between the junction plane; Described tubular filter 9 is positioned at described left shell 10 macropores, and its two ends connect with the mounting hole location of described end plate 8 right-hand members and described packing ring 4 respectively, form sealing; A pressure spring 6 is arranged in described filter inner chamber, and its two ends connect respectively at described packing ring 4 right-hand member heart portions and location, described push rod 5 left parts; Described choke plug 2 is made the axis body that left end has the backstop shoulder, makes annular groove on the external circle of this shoulder right-hand axis, and vent is made in this axis body right side between this annular groove bottom surface; These choke plug 2 axis bodies partly are inserted into aperture D left part in the described right shell body 11, and these choke plug 2 shoulder right-hand members and this nose end form sealing; A spring 3 is under compressive state, and locate respectively between the right-hand member that is connected in described choke plug 2 left ends and described push rod 5 at two ends; The multidiameter shaft positioning rod 15 that lower end is shaped on the back taper stage body is fitted in the described upper shell 12 in the shoulder holes, and both are slidingly matched, and form sealing; In the radial direction through hole of making on this positioning rod 15 that passes through its axis spring 14 is housed, spring 14 two ends steel ball press-loadings 13, these steel ball 13 exposed faces contact with outer convex ring body lower end surface in described upper shell 12 lower end hole walls and this hole, and this cone tables surface, positioning rod 15 lower end contacts with described push rod 5 right-hand members; The endoporus that is positioned at the left and right end of described housing is respectively the outlet, inlet hole; All be shaped on screw thread on this two ends cylindrical.

Compared with the prior art have the inflammable gas blocking ability after the utility model is realized strong, advantage such as explosion-proof performance is good, and is easy to operate, safe in utilization.

Below in conjunction with accompanying drawing embodiment of the present utility model is done explanation in further detail.

Fig. 1 is the utility model structural representation;

Fig. 2 is the I point enlarged view of Fig. 1;

Fig. 3 is the utility model user mode figure;

As seen from Figure 1, Figure 2, the utility model is made up of O-ring seals 1, choke plug 2, spring 3, packing ring 4, push rod 5, spring 6, packing ring 7, end plate 8, tubular filter 9, left shell 10, right shell body 11, upper shell 12, steel ball 13, spring 14, positioning rod 15, O RunddichtringO 16, O RunddichtringO 17, pipe box 18, bag shape nut 19, jump ring 20; Wherein O RunddichtringO 1, O RunddichtringO 16, O-ring seals 17 all adopt rubber material to make; The manufactured materials of spring 3, spring 6, spring 14 is stainless steel; Filter 9, employing steel material are made; Steel ball 13, jump ring 19 adopt stainless steel material to make respectively; Packing ring 4, packing ring 7 all adopt polytetrafluoroethylmaterial material to make, and all the other each parts all adopt brass material to make; Employed each part of the utility model all adopts the general mechanism method to make.

The explanation of strength member concrete structure:

Be shaped on valve opening in the right part axis body of choke plug 2, be shaped on left and right two place's annular grooves on its cylindrical, the outside diameter of folded outer convex ring body is made four radial holes less than above-mentioned axis body outside diameter in the middle of two annular grooves on the right-hand member annular groove, the above-mentioned vexed hole of this Kong Junyu is connected, and forms air vent; The left end of choke plug is shaped on the backstop shoulder, and the left side of this backstop shoulder is shaped on semiaxis, and this semiaxis is used for spring 3 location.

Push rod 5 is the axis-shaped components that are shaped on shoulder on the middle part cylindrical, in axis body the shoulder right side, make a vexed hole of ladder from its left end semiaxis end face, this end is used for location, spring 6 ends than the vexed hole of major diameter, its right-hand member is shaped on the ladder semiaxis, this semiaxis right-hand member is used for spring 3 location, this right-hand member semiaxis is made 4 through holes that are connected with vexed hole in the above-mentioned axis body with intersection, above-mentioned shoulder right side, forms vent.

The right-hand member center of area portion of above-mentioned end plate 8 is shaped on a vexed hole, and this outside, vexed hole is shaped on annular groove, and this vexed hole is used for spring 6 location.This annular groove is used for the filter end location, is shaped on the vent slot of two rectangular crossing across of sectional shape on its left side.

Be shaped on annular groove on the last rheme axle 15 underpart cylindricals, this annular groove is used to install seal ring 16, and this axle and its match the axial seal between the hole after guarantee to install finishing with potbellied.

The pressure of above-mentioned spring 6 is much larger than the pressure of spring 3.

After each part is got all the ready, get final product by the figure assembling.

As shown in Figure 3, in use the utility model left end passes through pipe box 18, seal ring 17, bag shape nut 19 etc. and decompressor 22 outlet nozzles 21 sealed attachment; The sebific duct end sealed attachment that its left end is used by corresponding coupling and gas transmission.

After reduction valve is opened, inflammable gas enters in the utility model right-hand member inlet hole, this gas pressure promotes choke plug 2 and moves to left, O-ring seals on it is broken away from and its hole wall of press contacts mutually, make the vent of inflammable gas enter filter 9 chambeies through being positioned on the push rod 5, enter after this gas directly filters in the outer cavity of this filter body, behind the vent slot on end plate 8 left sides, from the air outlet hole of the utility model left end, export again.

Explosion time later takes place in inflammable gas in airline hose, the pressurized gas that produce return in its chamber through the air outlet hole of the utility model left end, this gas pressure can make choke plug 2 move to right simultaneously, close induction port, make on the positioning shaft 15 and move (steel ball 13 will enter and be positioned at its top annular groove) and push rod 5 is moved to right under its left end spring pressure effect, the choke plug is held out against to right, this state will remain to and press down positioning shaft 15 again, make its return, make push rod 5 simultaneously till return under this inversed taper platform surface, positioning shaft 15 lower end promotion.

Claims

1, a kind of combustible gas back-fire explosive preventor, comprise bright body, choke plug, tubular filter, it is characterized in that: described housing is made up of right shell body (11), left shell (10) and upper shell (12), be shaped on vertical, level two holes in this right shell body (11), this horizontal hole by from left to right, from large to small tapped hole (A) of aperture, macropore (B), mesopore (C), each coaxial aperture of aperture (D) constitute this mesopore (C) and aperture (D) conical surface transition; This upright opening is to be made of than small through hole upper end diameter bigger tapped hole and lower end diameter, and the aperture of this lower end through hole and described mesopore (C) join; Described left shell (10) profile is the multidiameter shaft shape, be shaped on ladder hole in the body, its big bore dia is greater than the interior macropore of described right shell body (11) (B) diameter, this nose end cylindrical is made the outside thread that is complementary with described right shell body (11) interior threaded hole (A), and described left and right housing connects by this thread seal; Described upper shell (12) is the tubular body that is shaped on shoulder hole in the individuality, is shaped on the outer convex body of ring-type in its lower end macropore, and this end cylindrical is shaped on screw thread, and it is by this screw thread and described right shell body (11) upper end snail pit sealed attachment; A middle part is shaped on the axle shape push rod (5) of shoulder, be installed on the interior mesopore of described right shell body (11) (C) left part by this shoulder cylindrical, both are slidingly matched, this shoulder left side is by ring washer (a 4) backstop location that is installed in the interior macropore of described right shell body (11) (B) bottom, and this shoulder right side is stretched in the aperture, lower end of described right shell body (11) upright opening; The end plate (8) of radial dimension less than this aperture is equipped with at the interior macropore interior edge face of described left shell (10) place, and both are provided with vent slot between the junction plane; Described tubular filter (9) is positioned at described left shell (10) macropore, and its two ends connect with the mounting hole location of described end plate (8) right-hand member and described packing ring (4) respectively, form sealing; A pressure spring (6) is arranged in described filter inner chamber, and its two ends connect respectively at described packing ring (4) right-hand member heart portion and location, described push rod (5) left part; Described choke plug (2) is made the axis body that left end has the backstop shoulder, makes annular groove on the external circle of this shoulder right-hand axis, and vent is made in this axis body right side between this annular groove bottom surface; This choke plug (2) axis body partly is inserted into the interior aperture of described right shell body (11) (D) left part, and this choke plug (2) shoulder right-hand member and this nose end form sealing; A spring (3) is under compressive state, and locate respectively between the right-hand member that is connected in described choke plug (2) left end and described push rod (5) at two ends; The multidiameter shaft positioning rod (15) that lower end is shaped on the back taper stage body is fitted in the interior shoulder hole of described upper shell (12), and both are slidingly matched, and forms sealing; Spring (14) is housed in the radial direction through hole of making on this positioning rod (15) that passes through its axis, spring (14) two ends steel ball press-loadings (13), this steel ball (13) exposed face contacts with outer convex ring body lower end surface in described upper shell (12) lower end hole wall and this hole, and cone table surface in this positioning rod (15) lower end contacts with described push rod (5) right-hand member; The endoporus that is positioned at the left and right end of described housing is respectively the outlet, inlet hole; All be shaped on screw thread on this two ends cylindrical.