CN2614828Y

CN2614828Y - Dry type flash back preventer

Info

Publication number: CN2614828Y
Application number: CN 02244123
Authority: CN
Inventors: 管小渝; 秦盟生; 赵永生; 龚至容; 李卯祥
Original assignee: Individual
Current assignee: Individual
Priority date: 2002-07-26
Filing date: 2002-07-26
Publication date: 2004-05-12
Anticipated expiration: 2012-07-26

Abstract

The utility model is a dry-type tempering preventer for the gas welding and cutting, which comprises a metal shell, a metallic rod core, a metal net, an adjusting barrel, a seal head, an air-in connector and an air-out connector (or a welding and cutting torch). The characteristics of the utility model are that the metallic rod core is tightly rolled by a number of metal nets, then is put into the metal shell and is kept in close touch with an inner wall of the metal shell, a crossbar network on the metal net, together with the metallic rod core, the inner wall of the metal shell, the adjusting barrel, and the seal head form a special microchannel for the air to pass. When a tempering happens, the metal rod bar and the metal net receive the heat and quickly expand to block up the micropore, seal the gas passage, prevent the fire and extinguish the fire immediately, thereby realizing the purpose of preventing the tempering.

Description

Novel dry flashback arrestor

The utility model relates to a kind of dry flashback arrestor that is used for the gas welding field.

The key position of existing commonly used dry annealing device is to be overlapped together by the number of metal net to add check valve or being fired into fire-stopping pipe with the powder metallurgy method adds check valve, thereby play the anti-backfire effect, former structure causes anti-backfire efficient low, the latter causes the manufacturing cost height, easily stop up, and the action of the check valve that they are used often lags behind tempering speed, and the tempering accident happens occasionally.

The purpose of this utility model is to overcome weak point in the prior art, provides a kind of processing simple, and cost is low, good reliability, the new-type flash-back arrestor that anti-backfire efficient is high.

The purpose of this utility model realizes by following design:

With on the metal bar core tightly volume go up in the metal shell of packing into behind the wire netting of several layers it closely contacted with inner walls; One end of metal bar core and wire netting contacts with inlet suction port, and the other end contacts with the adjusting barrel; By regulating the tightness degree that barrel can be regulated wire netting, be provided with a seal head in the outer end of regulating barrel, keep regulating the sealing of barrel and metal bar core and wire netting and gas outlet end housing body inwall, be connected with air outlet adapter (or welding torch) by the housing screw thread again.During work, air-flow enters from inlet suction port, and the special micro channel that is constituted with metal bar core, inner walls, adjusting barrel, seal head by the vertical-horizontal network on the wire netting is (or welding torch) operate as normal to the gas outlet.When tempering takes place, metal bar core and wire netting are heated and expand blocking microporously rapidly, and with the gas passage sealing, blocking-up flame also extinguishes it immediately, reaches the anti-backfire purpose.

Fig. 1 is the utility model outline drawing; Fig. 2 is the utility model axial section.Fig. 3 is the utility model radial section figure.

Below in conjunction with accompanying drawing the utility model is further described:

As shown in the figure, lower end of the present utility model has inlet suction port (1) to be fixed on the metal shell (3) by nut (2), on the metal bar core (4) tightly volume have in the housing (3) of packing into behind the wire netting (5) of several layers and and keep closely contacting with inner walls (6), metal bar core (4) closely contacts with inlet suction port (1) with an end of wire netting (5), the other end contacts with adjusting barrel (7) conical horn mouth, the top ends of regulating barrel (7) is provided with for the regulating tank (8) of regulating usefulness, regulate barrel (7) by regulating tank (8) turn and can make wire netting (5) tightness degree obtain adjusting, thereby reach the operating pressure of regulating flash-back arrestor.Upper end and seal head (9) lower end of regulating barrel (7) join, and the upper end of seal head (9) closely links to each other with air outlet adapter (11) (or welding torch) by the connecting thread (10) of housing (3).

Close annexation between its overall structure and position: the metal bar core is tightly rolled up and is loaded in the metal shell behind the several layers wire netting and makes wire netting and the inner walls maintenance closely contacts; Wire netting end in housing links to each other with inlet suction port, and the other end contacts with the conical horn mouth of regulating barrel; Regulate the other end of barrel and lay seal head, the spheric end of seal head is by metal shell and air outlet adapter (or welding torch joint) close proximity.

The utility model has the advantages that: processing is simple, cost is low, good reliability, can end continuously fiery, Automatically recover normal air feed, anti-backfire efficient height.

Claims

1, a kind of novel dry flashback arrestor that is used for the gas welding; Form by metal shell, metal bar core, wire netting, adjusting barrel, seal head, inlet suction port and air outlet adapter (or welding torch); It is characterized in that: on the metal bar core tightly volume have to be loaded in the metal shell and behind the wire netting of several layers and keep closely contacting with inner walls; Vertical-horizontal network on the wire netting can pass through with the gas that metal bar core, inner walls, adjusting barrel, seal head are constituted, the special micro channel that also can be closed.

2, according to the described device of claim 1, its feature also is: the metal bar core is tightly rolled up and is loaded into behind the several layers wire netting in the metal shell and wire netting is closely contacted with the inner walls maintenance; Wire netting end in housing links to each other with inlet suction port, and the other end contacts with the conical horn mouth of regulating barrel; Regulate the other end of barrel and lay seal head, the spheric end of seal head is by metal shell and air outlet adapter (or welding torch joint) close proximity.