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CN-224222919-U - Welding gun non-return preventing device

CN224222919UCN 224222919 UCN224222919 UCN 224222919UCN-224222919-U

Abstract

The utility model belongs to the technical field of gas welding, and discloses a welding gun backflow prevention device which comprises a welding gun connector body, a copper valve core, a first copper core, a second copper core, a first spring, a second spring and a third spring, wherein the copper valve core is embedded in an inner cavity of the welding gun connector body, a first sealing ring is arranged on the outer wall of the copper valve core and forms a first layer of sealing structure with the inner cavity of the welding gun connector body, the first copper core is embedded in the copper valve core, a second sealing ring is arranged on the outer wall of the first copper core and forms a second layer of sealing structure with a carbon steel core and the inner cavity of the welding gun connector body, and double blocking is formed between the first copper core and the double sealing of the copper valve core through double sealing and integrated gas backflow prevention structures, so that high-pressure gas leakage and gas backflow penetration are effectively prevented. The non-return channel is arranged through the nested shrinkage of the first copper core and the second copper core, the inner diameter of the channel is reduced along the air flow direction, the turbulent flow effect is utilized to inhibit the gas backflow, and the blocking efficiency is improved by 90% compared with that of the traditional structure.

Inventors

  • Song Die
  • JIAN ZIWEI
  • YANG HAIBO
  • QU DAJUN
  • ZHANG GUOHUAI

Assignees

  • 伟鑫(广州)工业科技有限公司

Dates

Publication Date
20260512
Application Date
20250521

Claims (8)

  1. 1. Welding gun prevents back device, its characterized in that includes: the welding gun connector comprises a welding gun connector body (1), a copper valve core (2), a first copper core (3), a second copper core (4), a first spring (5), a second spring (6) and a third spring (7); The copper valve core (2) is embedded in the inner cavity of the welding gun joint body (1), the outer wall of the copper valve core is provided with a first sealing ring (21), and a first layer of sealing structure is formed with the inner cavity of the welding gun joint body; the first copper core (3) is nested in the copper valve core (2), the outer wall of the first copper core is provided with a second sealing ring (31), and a second layer sealing structure is formed by the first copper core, the carbon steel core (8) and the inner cavity of the welding gun joint body; The second copper core (4) is nested in the first copper core (3), and a third sealing ring (41) is arranged at the head of the second copper core; one end of the first spring (5) is supported at the end part of the copper valve core (2), and the other end of the first spring is supported at the end part of the first copper core (3); the second spring (6) is arranged on the first copper core (3) and is supported at the end part of the second copper core (4); the third spring (7) is arranged on the outer wall of the second copper core (4) and is supported in the inner cavity of the first copper core (3); The first copper core (3) is matched with the copper valve core (2) through a guide structure and used for preventing axial dislocation.
  2. 2. The welding gun anti-return device according to claim 1, wherein the first sealing ring (21) is of an annular structure, is arranged in a sealing groove of the outer wall of the copper valve core (2) and forms radial sealing with the inner cavity of the welding gun joint body; The second sealing ring (31) and the carbon steel core (8) form bidirectional sealing with the inner cavity of the welding gun joint body.
  3. 3. The welding gun anti-check device according to claim 1, wherein the guiding structure comprises a guiding groove (91) arranged on the inner wall of the copper valve core (2) and a guiding protrusion (92) arranged on the outer wall of the first copper core (3), and the guiding groove and the guiding protrusion are in sliding fit to realize axial alignment.
  4. 4. The welding gun anti-return device according to claim 1, characterized in that the spring constants of the first spring (5), the second spring (6) and the third spring (7) are sequentially increased.
  5. 5. The welding gun anti-return device according to claim 1, characterized in that the third sealing ring (41) at the head of the second copper core (4) is of a conical structure and forms sealing fit with the conical surface of the inner cavity of the welding gun joint body (1).
  6. 6. The welding gun anti-return device according to claim 1, wherein the nested channels of the first copper core (3) and the second copper core (4) form an anti-return structure, and the inner diameter of the channel is gradually reduced along the air flow direction, so that turbulence is formed to inhibit the back flow propagation of air.
  7. 7. The welding gun anti-return device according to claim 1, characterized in that the total axial travel of the copper spool (2) and the first copper spool (3) is less than 15mm, constituting a short travel.
  8. 8. The welding gun anti-return device according to claim 1, characterized in that the first sealing ring (21), the second sealing ring (31) and the third sealing ring (41) are made of high temperature resistant rubber materials with different hardness, wherein the shore hardness of the first sealing ring (21) is larger than that of the second sealing ring (31).

Description

Welding gun non-return preventing device Technical Field The utility model relates to the technical field of gas welding, in particular to a welding gun non-return prevention device. Background In gas welding or gas cutting operation, tempering phenomenon can occur in gas backflow, which is one of the main potential safety hazards. In the prior art, the device for preventing the return has the following problems: The traditional anti-return device generally adopts a single-layer sealing design (such as a one-way valve or a simple sealing ring), is easy to cause gas leakage due to sealing failure under high-pressure or high-temperature environment, and cannot completely block flame propagation. Most anti-backup devices rely on mechanical springs or differential air pressure to trigger action, which presents a delay problem. In the prior art, the anti-return device is often required to be additionally provided with an explosion-proof valve, a cooling module and other components, so that the whole structure is bulky and is difficult to integrate into the welding gun. Disclosure of utility model The utility model mainly aims to provide a welding gun anti-return device, and aims to solve the problems that a traditional anti-return device generally adopts a single-layer sealing design (such as a one-way valve or a simple sealing ring), gas leakage is easy to occur due to sealing failure under a high-pressure or high-temperature environment, and flame propagation cannot be completely blocked. Most of the non-return devices rely on mechanical springs or air pressure difference triggering actions, and have the technical problem of delay. In order to achieve the above object, a first aspect of the present utility model provides a welding gun return prevention device, comprising: The welding gun comprises a welding gun connector body, a copper valve core, a first copper core, a second copper core, a first spring, a second spring and a third spring; The copper valve core is embedded in the inner cavity of the welding gun joint body, the outer wall of the copper valve core is provided with a first sealing ring, and a first layer of sealing structure is formed with the inner cavity of the welding gun joint body; The first copper core is nested in the copper core, the outer wall of the first copper core is provided with a second sealing ring, and a second layer of sealing structure is formed with the carbon steel core and the inner cavity of the welding gun joint body; the second copper core is nested in the first copper core, and a third sealing ring is arranged at the head of the second copper core; One end of the first spring is supported at the end part of the copper valve core, and the other end of the first spring is supported at the end part of the first copper valve core; The second spring is arranged on the first copper core and is supported at the end part of the second copper core; the third spring is arranged on the outer wall of the second copper core and is supported in the inner cavity of the first copper core; the first copper core is matched with the copper valve core through a guide structure and used for preventing axial dislocation. Further, the first sealing ring is of an annular structure, is arranged in the sealing groove on the outer wall of the copper valve core and forms radial sealing with the inner cavity of the welding gun joint body; And the second sealing ring and the inner cavity of the carbon steel core and the welding gun joint body form bidirectional sealing. Further, the guide structure comprises a guide groove arranged on the inner wall of the copper valve core and a guide protrusion arranged on the outer wall of the first copper valve core, and the guide groove and the guide protrusion are in sliding fit to realize axial alignment. Further, the elastic coefficients of the first spring, the second spring and the third spring are sequentially increased. Further, the third sealing ring at the head part of the second copper core is of a conical structure and forms sealing fit with the conical surface of the inner cavity of the welding gun joint body. Further, the nested channels of the first copper core and the second copper core form a backflow preventing structure, the inner diameter of the channel is gradually reduced along the air flow direction, turbulence is formed to prevent the air from flowing back, and accordingly flame propagation is restrained. Further, the total axial travel of the copper valve core and the first copper valve core is smaller than 15mm, so that a short travel is formed. Further, the first sealing ring, the second sealing ring and the third sealing ring are made of high-temperature-resistant rubber materials with different hardness, wherein the Shore hardness of the first sealing ring is larger than that of the second sealing ring. The beneficial effects are that: 1. According to the utility model, the double-layer sealing and the integrated anti-backflow struc