KR101761903B1 - Back Fire Preventing Device having a Temperature Sensing Part - Google Patents

Back Fire Preventing Device having a Temperature Sensing Part Download PDF

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Publication number
KR101761903B1
KR101761903B1 KR1020150062293A KR20150062293A KR101761903B1 KR 101761903 B1 KR101761903 B1 KR 101761903B1 KR 1020150062293 A KR1020150062293 A KR 1020150062293A KR 20150062293 A KR20150062293 A KR 20150062293A KR 101761903 B1 KR101761903 B1 KR 101761903B1
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KR
South Korea
Prior art keywords
check valve
gas supply
gas
flame
supply path
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KR1020150062293A
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Korean (ko)
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KR20160130125A (en
Inventor
강의창
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강의창
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Priority to KR1020150062293A priority Critical patent/KR101761903B1/en
Publication of KR20160130125A publication Critical patent/KR20160130125A/en
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23D—BURNERS
    • F23D14/00—Burners for combustion of a gas, e.g. of a gas stored under pressure as a liquid
    • F23D14/46—Details, e.g. noise reduction means
    • F23D14/72—Safety devices, e.g. operative in case of failure of gas supply
    • F23D14/82—Preventing flashback or blowback
    • F23D14/825—Preventing flashback or blowback using valves
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K7/00—Cutting, scarfing, or desurfacing by applying flames
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K7/00—Cutting, scarfing, or desurfacing by applying flames
    • B23K7/10—Auxiliary devices, e.g. for guiding or supporting the torch
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
    • F16K15/00—Check valves
    • F16K15/02—Check valves with guided rigid valve members
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23D—BURNERS
    • F23D14/00—Burners for combustion of a gas, e.g. of a gas stored under pressure as a liquid
    • F23D14/46—Details, e.g. noise reduction means
    • F23D14/48—Nozzles
    • F23D14/52—Nozzles for torches; for blow-pipes
    • F23D14/54—Nozzles for torches; for blow-pipes for cutting or welding metal

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Feeding And Controlling Fuel (AREA)

Abstract

A body portion having one end coupled to the gas inlet of the valve bundle portion and the other end coupled to one end of the nipple portion and having a gas supply path extending therethrough in the longitudinal direction; A check valve unit provided on an inlet side of the gas supply path to allow a gas to flow from an inlet of the gas supply path and to prevent the gas from flowing out; And an overheat sensing unit installed on an outlet side of the gas supply path to close the gas supply path by applying a force to the check valve unit during overheating by backfire, wherein the other end of the nipple unit It is possible to close the gas supply pipe with a high pressure at the time of overheating due to backfire and to minimize the deterioration of the check valve spring due to occurrence of backfire, So that the degradation of performance can be minimized.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a back-

More particularly, the present invention relates to an overheat sensing unit having an overheat sensing unit. The overheat sensing unit is capable of closing a gas supply pipe at a high pressure during overheating due to backfire, The present invention relates to an anti-backlash device having an overheat sensing unit, which can minimize deterioration of the device.

Generally, a gas cutting torch is used to melt-cut steel materials such as steel plates and steel frames. The gas cutting torch uses oxygen gas and acetylene gas, and backflushing often occurs during the cutting operation.

Backflushing is a phenomenon in which the flame generated when the mixing rate of the gas mixture of oxygen and gas is smaller than the burning rate of the mixed gas is reversed. When this backflushing occurs, the gas cutting torch is overheated, which can cause burns on the hands of the operator, and there is a danger of a large explosion if the flame is backed up to the gas cylinder due to backflushing.

As a countermeasure against this, a backfire prevention device is installed and used in a gas cutting torch and the like. As an example of the technology related to this backfire prevention device, a backfire prevention check valve has been proposed in the following patent document 1, 2, an 'anti-backfire device having a plug integrally' has been proposed. In the following Patent Document 3, an 'automatic backfire prevention device' has been proposed. In the following Patent Document 4, a 'backfire prevention device' has been proposed In the following Patent Document 5, a backfire prevention coupler has been proposed.

Korean Patent Publication No. 10-2003-0046050 (published on October 10, 2003) Registered Utility Model No. 20-0379588 of the Republic of Korea (Announcement Date: March 24, 2005) Korean Registered Patent No. 10-0822635 (Publication date Apr. 16, 2008) Registered Utility Model No. 20-0450037 of the Republic of Korea (Published on August 31, 2010) Korean Registered Patent No. 10-1289980 (Published on July 26, 2013)

Patent Document 3 proposes an automatic backfire prevention device capable of effectively preventing backflow of gas due to explosion pressure at the time of backfire and effectively dispersing backfire flames, A method of regulating a pressure is not possible at all in the case of occurrence of an abnormal pressure at the time of gas supply, hunting or pressure drop, and when the safety film is broken, the safety film must be replaced after the operation is stopped.

The conventional backfire prevention devices disclosed in Patent Documents 1 to 5 are all disposed in the direction in which the backward direction of the spring of the check valve is propagated. Even when the backfire is blocked by the anti-fouling filter or the like before reaching the spring of the check valve, Is heated to a high temperature by the high-temperature gas and is deteriorated, the elastic force is lowered, and the gas supply pipe can not be closed with sufficient pressure.

Especially, the spring used in the check valve of the conventional backfire prevention device can not make the elastic force to be higher than a certain level so that the low-pressure gas can overcome the deflection force of the check valve spring and can be supplied to the gas supply pipe. When the spring is heated and deteriorated at a high temperature and the elastic force is lowered, there is a disadvantage in that the ability to block the flow path of the check valve is significantly lowered.

SUMMARY OF THE INVENTION An object of the present invention is to solve the above-mentioned problems, and it is an object of the present invention to provide an overheat sensing unit capable of closing a gas supply pipe with high pressure at the time of overheating by backfire and minimizing deterioration of a check valve spring And an overheat detecting unit for detecting an overheat.

According to an aspect of the present invention, there is provided a backfire prevention device having an overheat sensing part, wherein one end is coupled to the gas inlet of the valve bundle, one end of the nipple is coupled to the other end, A body portion in which a gas supply path is formed; A check valve unit provided on an inlet side of the gas supply path to allow a gas to flow from an inlet of the gas supply path and to prevent the gas from flowing out; And an overheat sensing unit installed on an outlet side of the gas supply path to close the gas supply path by applying a force to the check valve unit during overheating by backfire, wherein the other end of the nipple unit And is connected to an end of the gas supply pipe.

Here, the body portion may include a nipple fixing jaw portion formed on an inner side surface of an inlet side end portion of the gas supply passage; A closing spring supporting step formed at a central portion of the gas supply path; And a decontamination element fixing step formed on an inner surface of an end portion of the gas supply passage on the side of the outlet of the gas supply path, wherein the overheat sensing part has a flange formed at one end thereof so as to be contacted with the fixed element, A decontamination element through which one end of the connection shaft is inserted and connected; A spring supporting plate disposed between the closing spring supporting step and the nipple fixing jaw and having a plurality of through holes formed in a circumferential direction around the connecting shaft fixed to the center and having the connecting shaft fixed to the center thereof; And a closing spring installed between the closing spring supporting step and the spring support plate such that the connection shaft receives a biasing force toward the inlet of the gas supply path. When overheated by the backing, And one end of the connection shaft is separated from the subsidiary element.

Here, the check valve unit may include a guide part guiding one end of the check valve to slide along the gas supply path, a plurality of gas flow holes formed on the outer periphery of the center part, and an inlet port A check valve head provided with a check valve packing at the outer periphery of the other end in contact with the stepped portion of the nipple portion inserted into the side end portion; And a check valve spring installed between the spring support plate and the check valve head to receive a biasing force in a direction in which the check valve head is brought into contact with the stepped portion.

Here, the check valve spring has an elastic force such that the check valve head is spaced from the step portion by a supply pressure of gas supplied to the inlet of the gas supply path so that gas can flow into the check valve spring, And the other end of the connection shaft pushes the check valve head so that the check valve head contacts the step portion after the connection between the subsidiary element of the subsidiary element and the connection shaft is released, So that the check valve head has an elastic force not to be separated from the step portion.

Here, the decontamination element may be manufactured by press-sintering any one selected from brass particles and stainless particles at a high temperature.

Here, one end of the subsidiary element and the connection shaft may be combined with each other by a thermoplastic resin adhesive or by brazing or by a snap ring of a thermoplastic resin material.

Here, the overheat sensing unit may further include a coupling pipe inserted through the central portion of the other end of the decontamination element so as to be in contact with the outer circumferential surface of one end of the coupling shaft protruding inward of the decontaminating element, And one end portion of the connection shaft penetrating the central portion and projecting to the inside of the subsidiary element is connected to the one end portion of the coupling tube by thermoplastic resin adhesive or soldering.

The body portion may further include a flame blocking flange support jaw formed between the space portion where the decontamination element is installed and the closing spring supporting step portion on the side of the outlet of the gas supply passage, And is fixed in contact with the flame blocking flange supporting jaw on the outside of the other end of the flame-proofing element so as to prevent the flame from passing through between the outer peripheral surface of the one end of the connecting shaft and the other end of the flame- Wherein the flame blocking flange has a plurality of flange through holes formed in a circumferential direction around the connecting shaft passing through the central portion of the flame blocking flange, And the flame shielding flange is provided between the other end of the flame shielding element and the flame shielding flange, And a landing packing is installed.

According to the backfire prevention apparatus having the overheat sensing unit according to the present invention, the overheat sensing unit is provided, and the gas supply pipe can be closed at a high pressure in the event of overheating due to backfire.

Further, deterioration of the check valve spring due to occurrence of backfire can be minimized, so that the deterioration of the flow path blocking ability of the check valve can be minimized.

Further, even when the check valve spring deteriorates due to backfire, the effect that the check valve head can be closed with a high pressure by the closing spring, the spring support plate, and the connecting shaft can be obtained.

1 is a cross-sectional view illustrating an internal configuration of a backfire prevention device having an overheat sensing unit according to the present invention.
FIG. 2 is an exploded view of a backfire prevention apparatus having an overheat sensing unit according to the present invention,
3 is a view showing a state in which a backfire prevention device having an overheat sensing unit according to the present invention is installed in a gas supply pipe of a gas cutting machine,
4 is a side view showing a gas cutting machine equipped with an anti-backfire device having an overheat sensing unit according to the present invention.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings, and the present invention is not limited to the embodiments.

Hereinafter, a configuration of a backfire prevention apparatus 1 having an overheat sensing unit according to a preferred embodiment of the present invention will be described.

FIG. 1 is a cross-sectional view illustrating an internal configuration of a backfire prevention apparatus having an overheat sensing unit according to the present invention, and FIG. 2 is an exploded view of a backfire prevention apparatus having an overheat sensing unit according to the present invention.

The backfire prevention device 1 having the overheat sensing part according to the present invention includes a body part 10, an overheat sensing part 20 and a check valve part 30.

The body 10 has an outer shape and a skeleton of the back fire prevention device 1 having the overheat sensing part according to the present invention and has a shape substantially like a cylindrical tube, And one end of the nipple portion 40 is coupled to the other end portion.

In this case, one end of the body 10 is connected to the gas inlet of the valve bundle 930, a thread is formed on the outer circumferential surface of the end of the body 10, and then one end of the body 10 May be coupled to the gas inlet port of the valve bundle 930 and connected to the gas inlet port of the valve bundle 930 through a connecting tube portion 70 as shown in FIGS. have.

When the connecting tube portion 70 is used, the connecting tube portion 70 functions to connect the gas inlet of the valve bundle portion 930 to one end of the body portion 10. One end of the connecting tube portion 70 is connected to the valve body And the other end of the connecting tube portion 70 is connected to the one end of the body portion 10 and communicated.

At this time, one end of the connection tube portion 70 may be welded to the gas inlet of the valve bundle portion 930, and then welded or fixed. After a thread is formed on the outer circumferential surface of the one end portion of the connection tube portion 70, May be coupled to the gas inlet of the valve bundle 930 so as to be coupled.

A thread is formed on the outer circumferential surface of the connecting tube portion 70 so that the other end of the connecting tube portion 70 can be fastened to one end of the body portion 10. The inner circumferential surface of the one end portion of the corresponding body portion 10 So that a thread is formed.

A gas supply passage (11) penetrating in the longitudinal direction is formed in the body part (10). Therefore, gas introduced into one end portion (inlet portion: right end portion of the body portion in FIG. 1) can be discharged to the other end portion (outflow port: left end portion of the body portion in FIG. 1) through the gas supply path 12.

A nipple fixing jaw 15 is formed on the inner surface of the gas inlet side end of the gas supply passage 11. The one end of the nipple portion 40 is caught by the nipple fixing jaw portion 15 when the nipple portion 40 is fastened to the inlet side end portion of the body portion 10 so that the stepped portion 41 of the nipple portion 40, To the correct position in the gas supply path (11).

A closing spring supporting step 14 protruding to support one side of the check valve spring 320 of the check valve unit 30 is formed at the center of the gas supply path 12. Therefore, one side of the check valve spring 320 is supported on the right side surface of the closing spring supporting step 14.

An anti-decay element fixing step 12 is formed on the inner surface of the end of the gas supply path 11 on the side of the outlet. The flange portion 211 of the anti-microbial element 210 can be caught by the anti-decay element fixing jaw portion 12 when the anti-microbial element 210 is fitted inwardly from the outlet side end portion of the gas supply path 11. [

The overheat sensing unit 20 functions to close the gas supply path 11 by applying a force to the check valve unit 30 during overheating due to backfire and is provided on the side of the outlet of the gas supply path 11 A spring support plate 220, and a closing spring 230. As shown in FIG.

The decontamination element 210 is a part which functions to flow back the gas flow path and extinguish a flame which has reached the decontamination element 210. The decontamination element 210 is formed of a sintered metal having fine pores and a clearance, .

The flame retarding element 210 rapidly decreases the temperature of the flame reaching the barbiturizing element 210, which has a high thermal conductivity coefficient and is excellent in endothermic performance, thereby extinguishing the flame. For this purpose, the anti-microbial element 210 is preferably produced by pressing and sintering brass or stainless particles (diameter of 1 mm or less) at a high temperature.

A flange portion 211 is formed at one end of the decontaminating element 210 so that the decontamination element 210 can be fixed while being fitted inwardly from the outlet side end of the gas supply path 11. [ The flange portion 211 is brought into contact with and fixed to the anti-decaying element fixing jaw portion 12 when the anti-nucleating element 210 is fitted inwardly from the outlet side end portion of the gas supply path 11. [

One end of the connecting shaft 60 is inserted through the center of the other end of the anti-decontaminating element 210. However, when the anti-inflammatory element 210 is heated by backfire, the coupling between the anti-inflammatory element 210 and one end of the connection shaft 60 is released, and one end of the connection shaft 60 is separated from the anti-

To this end, one end of the subsidiary element 210 and the connecting shaft 60 may be coupled to each other by a thermoplastic resin adhesive such as an ethylene-vinyl acetate copolymer (EVA) or by brazing or by a snap ring of a thermoplastic resin material .

In this embodiment, the overheat sensing unit 20 further includes a coupling pipe 240. The coupling tube 240 is a tubular member that penetrates the central portion of the other end of the decanter 210 and is fitted in contact with the outer peripheral surface of one end of the coupling shaft 60 protruding inward of the decanter 210.

By further including the coupling pipe 240, the outer circumferential surface of the one end of the connection shaft 60, which penetrates the central portion of the other end of the subsidiary element 210 and protrudes to the inside of the subsidiary element 210, It is possible to primarily prevent the flame from passing through the end portions due to backfire.

As shown in FIG. 1, one end of the coupling shaft 60, which penetrates the central portion of the other end of the anti-decaying element 210 and protrudes to the inside of the anti-decaying element 210, and one end of the coupling tube 240, Bonded by resin adhesive or brazing. Accordingly, when one end of the subsidiary element 210, the coupling tube 240, and the coupling shaft 60 is heated by backfire, the coupling between one end of the coupling tube 240 and one end of the coupling shaft 60 is released One end of the connection shaft 60 is disconnected from the decontamination element 210.

The flame passes through the central portion of the other end of the incineration element 210 and passes through the backside between the outer peripheral surface of the one end of the connection shaft 60 projecting inward of the incineration element 210 and the other end of the incineration element 210 The flame blocking flange 250 may be further included in the overheat sensing unit 20. [

At this time, the body 10 has a flame blocking flange supporting jaw 13 formed between the space portion where the anti-flame element 210 is installed and the closing spring supporting step 14 at the outlet side of the gas supply path 11 .

The flame blocking flange 250 is fixed in contact with the flame blocking flange supporting jaw 13 from the outside of the flame retardant element 210 and the connecting shaft 60 is passed through the central portion of the flame blocking flange 250.

In the flame blocking flange 250, a plurality of flange through holes 251 are formed in the circumferential direction about the connecting shaft 60 passing through the center portion. The gas is supplied to the flame through the plurality of flange through holes 251, And can be moved to the front and rear of the blocking flange 250.

The plurality of flange through holes 251 may be formed in the shape of a general through hole as shown in FIG. 1, and may be formed to be concave from the circumference of the flame shield flange 250 as shown in FIG. 2 It is possible.

A flange packing 255 is provided between the other end of the decontamination element 210 and the flame blocking flange 250 so as to surround the outer circumferential surface of the connecting shaft 60. The flange packing 255 is preferably made of a fluororubber material so as to prevent slippage and to prevent damage by flame.

The flame blocking flange 250 and the flange packing 255 are formed by the flame blocking flange 250 and the flange packing 255 so that the outer circumferential surface of one end of the connecting shaft 60 passing through the central portion of the other end of the anti- The passage of the flame due to the back fl ow through the other ends of the flame 210 is further blocked.

The spring support plate 220 is inserted into the gas supply passage 11 so as to be movable in the longitudinal direction of the body 10 by the elastic force of the closing spring 230. The connection shaft 60 is fixed to the center of the spring support plate 220 The spring support plate 220 fixed to the connection shaft 60 is disposed between the closing spring supporting step 14 and the nipple fixing jaw 15. [

The spring support plate 220 is formed with a plurality of through holes 221 in the circumferential direction around the connection shaft 60 fixed at the center so that the gas is supplied to the spring support plate 220 Through the through holes 221.

The plurality of through holes 221 may be formed in the shape of a general through hole as shown in FIG. 1, or may be recessed from the peripheral portion of the spring support plate 220 as shown in FIG. 2 .

As shown in FIG. 2, the spring support plate 220 is formed with a SUS ring retaining groove at a central portion at one side thereof, as an example of a method for fixing the connection shaft 60 at the center of the spring support plate 220. And the inner surface of the SUS ring 260 is brought into contact with the SUSING ring engagement groove and the SUS ring ring 260 is inserted into the SUS ring ring groove at the position of the connection shaft 60 to which the spring support plate 220 is to be fixed. The connection shaft 60 can be fixed to the center of the spring support plate 220 by contacting the outer surface of the groove 260 to the groove.

At this time, it is preferable that the sus ring 260 is made of stainless steel.

The closing spring 230 is a member that applies a biasing force to the spring support plate 220 and the connection shaft 60 in the direction in which the other end of the connection shaft 60 is in contact with the check valve head 310 to be described later, And is provided between the spring supporting step 14 and the spring support plate 220. [

1, the closing spring 230 is installed between the closing spring supporting step 14 and the spring supporting plate 220 in a compressed state. Accordingly, the connection shaft 60 and the spring support plate 220 coupled to each other receive a biasing force in a direction in which the other end of the connection shaft 60 comes into contact with the check valve head 310.

One end of the connection shaft 60 is disconnected from the decontamination element 210 by backfeeding so that the other end of the connection shaft 60 is in contact with the check valve head 310, The check valve head 310 should be compressed so as to have such an elastic force as not to be separated from the step portion 41 to be described later.

Therefore, even when the check valve spring 320 of the check valve unit 30, which will be described later, is heated to a high temperature and deteriorated to reduce the elastic force and can not close the gas supply path 11 due to the hot gas by backfire, The check valve head 310 provided with the valve seal 315 is brought into close contact with the stepped portion 41 by the elastic force of the closing spring 230 to close the gas supply path 11.

For this purpose, the check valve spring 320 must have an elastic force such that the check valve head 310 can be spaced from the step 41 by the supply pressure of the gas, while the closing spring 230 supplies the gas The check valve head 310 must be resilient enough not to be separated from the step 41 by the pressure. Therefore, it is preferable that the closing spring 230 be made to have a sufficiently strong elastic force in case the hot gas is heated to a high temperature by deterioration and deteriorated.

The connection shaft 60 and the spring support plate 220 coupled to each other are moved toward the inlet side of the gas supply path 11 when one end of the connection shaft 60 is separated from the anti- And the other end of the connecting shaft 60 is brought into contact with the check valve head 310 so that the check valve head 310 is brought into close contact with the step portion 41 to be described later to thereby close the gas supply path 11 .

The check valve unit 30 is provided on the inlet side of the gas supply path 11 and functions as a stopper for allowing the gas to flow from the inlet port of the gas supply path 11 and preventing the outflow thereof. 310 and a check valve spring 320.

The check valve head 310 is brought into close contact with the stepped portion 41 to close the gas supply path 11 when the pressure of the gas is low or the pressure in the gas supply path 11 becomes higher than the gas supply pressure Function.

A guide portion 311 is formed at one end of the check valve head 310. The guide portion 311 has a function of guiding the check valve head 310 to slide along the gas supply passage 11 while maintaining the arrangement direction thereof .

A plurality of gas flow holes 312 are formed in the outer periphery of the central portion of the check valve head 310. Therefore, when the check valve head 310 is separated from the step 41 by the supply pressure of the gas, the gas flows from the inlet side of the gas supply path 12 through the plurality of gas flow holes 312, .

In addition, a check valve packing 315 is provided at the outer periphery of the other end of the check valve head 310.

The end of the nipple portion 40 is caught by the nipple fixing jaw portion 15 when one end of the nipple portion 40 is fastened to the end portion of the inlet portion of the body portion 10. The end portion of the nipple portion 40 A step portion 41 having a shape that can be brought into close contact with the valve head 310 is formed.

The check valve head 310 provided with the check valve packing 315 is moved to the stepped portion 41 when the pressure in the gas supply path 11 becomes higher than the gas supply pressure So that the gas supply passage 11 is closed. The check valve seal 315 is preferably made of fluoro rubber so as to prevent slippage and to prevent damage by flame.

The check valve spring 320 is a member that applies a biasing force to the check valve head 310 in a direction in which the check valve head 310 comes into contact with the step portion 41. The spring support plate 220 and the check valve head 310 .

The check valve spring 320 should have an elasticity enough to allow the check valve head 310 to be spaced from the step 41 by the supply pressure of the gas. Accordingly, since the check valve spring 320 has a relatively weak elastic force, the check valve spring 320 is heated to a high temperature by the hot gas due to backfire and is liable to deteriorate in elasticity.

However, in the check valve unit 30 of the backfire prevention device 1 having the overheat sensing unit according to the present invention, the check valve spring 320 is connected to the discharge port 210 of the gas supply path 11 And is provided at the inlet side of the distant gas supply passage 11.

Therefore, the heat generated by the flame retarding element 210 disappearing by the flame retarding element 210 can be prevented by the flame blocking flange 250, the closing spring supporting step 14, the closing spring 230, and the spring supporting plate 220 The deterioration of the check valve spring 320 can be minimized and the deterioration of the flow path blocking ability of the check valve portion 30 can be minimized as compared with the conventional configuration .

Even when the check valve spring 320 is heated to a high temperature by the high temperature gas due to backfire and is deteriorated to reduce the elastic force so that the gas supply path 11 can not be closed with sufficient pressure, The connection shaft 60 and the spring support plate 220 coupled to each other are moved to the inlet side of the gas supply path 11 when one end of the connection shaft 60 is disconnected from the decontamination element 210 in the sensing unit 20 And the other end of the connecting shaft 60 is brought into contact with the check valve head 310 so that the check valve head 310 is brought into close contact with the step portion 41 to be described later so as to close the gas supply path 11 .

Therefore, there is an advantage that the risk that the gas cylinder can explode by backfire can be minimized.

Hereinafter, a description will be made of a state in which the backfire prevention device 1 having the above-described construction according to the present invention is installed in the gas cutter 900.

FIG. 3 is a view showing a state in which a back-flushing prevention device having an overheat sensing unit according to the present invention is installed in a gas supply pipe of a gas cutter, and FIG. 4 is a cross- Fig.

The gas cutter 900 includes a head portion 910, an oxygen gas supply pipe 920, a valve bundle portion 930 and a handle 940. The gas cutter 900 includes an overheat prevention unit 1 is installed between the gas supply pipe 941 inside the handle 940 and the gas inlet of the valve bundle 930.

A preheated oxygen supply pipe 921, a preheated gas supply pipe 922 and a cutoff oxygen supply pipe 923 are connected to one side of the bent head 910. A preheated oxygen supply pipe 921, a preheated gas supply pipe 922, And the cut oxygen supply pipe 923 supplies the incoming oxygen and gas from the valve bundle portion 930 to the head portion 910. [

The valve bundle portion 930 is a portion for supplying oxygen separately into preheated oxygen and cut oxygen and is provided with a preheating oxygen valve 931, a cutoff oxygen valve 932 and a preheating gas valve 933, A gas supply pipe 941 and an oxygen supply pipe 942 are coupled to one side of the gas supply pipe 930.

The gas supply pipe 941 and the oxygen supply pipe 942 are disposed inside the handle 940 and are provided outside the gas supply pipe 941 and the oxygen supply pipe 942, The handle cover 945 is provided.

The backfire prevention device 1 having the overheat sensing unit according to the present invention is installed between the gas inlet of the valve bundle portion 930 of the gas cutter 900 of this basic structure and the gas supply pipe 941.

The other end of the nipple part 40 is connected to the inlet side end of the body part 10 and the other end of the nipple part 40 is connected to the outlet end side part of the body part 10 to communicate with the gas inlet port of the valve bundle part 930. And the end portion of the gas supply pipe 941 is joined by using the fastening member 50.

In this way, the backfire prevention apparatus 1 having the overheat sensing unit according to the present invention has an advantage that it can be easily installed and used on the flow path through which the gas is supplied even in the conventional gas cutting machine without the backfire prevention unit.

Hereinafter, operational states of the backfire prevention apparatus 1 having the overheat sensing unit according to the present invention will be described.

FIG. 1 shows a state in which a gas cutter 900 is not used after a backflushing prevention device 1 having an overheat sensing unit according to the present invention is installed in a gas cutter 900. FIG. In this state, the inlet side of the gas supply passage 11 is closed by the check valve portion 30 in a state where no gas is supplied.

When the gas cutter 900 is used, the check valve head 310 is separated from the stepped portion 41 by the supply pressure of the gas, and the gas is introduced.

The check valve unit 30 closes the gas supply path 11 due to an increase in the pressure in the gas supply path 11. When the overheat is detected, The connection shaft 60 and the spring support plate 220 coupled to each other are moved to the inlet side of the gas supply path 11. [ The other end of the connecting shaft 60 is brought into contact with the check valve head 310 so that the check valve head 310 is brought into close contact with the step portion 41 to be described later to thereby close the gas supply path 11

The backfire prevention apparatus having the overheat sensing unit according to the present invention is advantageous in that the overheat sensing unit is provided to close the gas supply pipe with a high pressure when overheating due to backfire.

Further, deterioration of the check valve spring due to occurrence of backfire can be minimized, so that deterioration of the flow path blocking ability of the check valve can be minimized.

Further, even when the check valve spring deteriorates due to backfire, there is an advantage that the check valve head can close the gas supply pipe with a high pressure by the closing spring, the spring supporting plate, and the connecting shaft.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed exemplary embodiments, but, on the contrary, is intended to cover various modifications and equivalent arrangements included within the spirit and scope of the invention. Accordingly, such modifications or changes should be construed as being included within the scope of the present invention.

1: Anti-backlash device having an overheat detecting unit
10: Body part 11: Gas supply path
12: Decontamination element fixing jaw 13: Flame blocking flange supporting jaw
14: Closing spring support step 15: Nipple fixing jaw
20:
210: decontamination element 211: flange portion
220: spring support plate 221: through hole
230: Closing spring 240: Coupling tube
250: Flame shut off flange
251: Flange through hole 255: Flange packing
260: Sourcing
30: Check valve section
310: check valve head 311: guide portion
312: Gas flow hole 315: Check valve packing
320: Check valve spring
40: nipple part 41: stepped part
50: fastening member 60: connecting shaft
70:

Claims (8)

A body portion having one end connected to the gas inlet port of the valve bundle portion and the other end portion coupled to one end of the nipple portion and having a gas supply passage penetrating the longitudinal direction thereof;
A check valve unit provided on an inlet side of the gas supply path to allow a gas to flow from an inlet of the gas supply path and to prevent the gas from flowing out; And
And an overheat sensing unit installed on an outlet side of the gas supply path to apply a force to the check valve unit to close the gas supply path when overheating due to backfire,
The other end of the nipple portion is connected to the end of the gas supply pipe by the fastening member,
The body portion
A nipple fixing jaw portion formed on an inner surface of an end portion of the gas supply passage on an inlet side;
A closing spring supporting step formed at a central portion of the gas supply path; And
And a decontamination element fixing step formed on an inner surface of an end portion of the gas supply passage on the side of the outlet,
The over-
A flame-proofing element having a flange at one end thereof to be fixed in contact with and fixed to the fixing jaw of the flame-proofing element, and one end of the coupling shaft being coupled to the center of the other end thereof;
A spring supporting plate disposed between the closing spring supporting step and the nipple fixing jaw and having a plurality of through holes formed in a circumferential direction around the connecting shaft fixed to the center and having the connecting shaft fixed to the center thereof; And
And a closing spring installed between the closing spring supporting step and the spring supporting plate such that the connection shaft receives a biasing force toward the inlet of the gas supply path,
And the connection shaft is disconnected from the one end of the connection shaft, so that one end of the connection shaft is separated from the subsidiary element when the overheat is overheated.
delete The method according to claim 1,
The check valve unit
A plurality of gas flow holes are formed in the outer periphery of the central portion, and a plurality of gas flow holes are formed in the peripheral portion of the nipple portion inserted into the end portion of the gas supply passage, A check valve head provided with a check valve seal on the outer periphery of the other end in contact with the step portion; And
And a check valve spring installed between the spring support plate and the check valve head to receive a biasing force in a direction in which the check valve head comes into contact with the stepped portion.
The method of claim 3,
Wherein the check valve spring has an elastic force such that the check valve head is separated from the step portion by a supply pressure of the gas supplied to the inlet of the gas supply path to allow gas to flow therein,
Wherein the closing spring is configured such that in a state in which the other end of the connection shaft pushes the check valve head such that the check valve head abuts on the step portion after the coupling between the subsidiary portion of the subsidiary portion of the connection shaft is released, Wherein the check valve head has an elastic force such that the check valve head is not separated from the stepped portion by the supply pressure of the gas.
The method according to claim 3 or 4,
Characterized in that the anti-flame element is manufactured by press-sintering any one selected from brass particles and stainless particles at a high temperature.
6. The method of claim 5,
The backfire prevention device according to claim 1, wherein one end of the subsidiary shaft and the subsidiary shaft are coupled to each other by a thermoplastic resin adhesive or soldering or by a snap ring of a thermoplastic resin material.
6. The method of claim 5,
The over-
And a coupling tube inserted through the central portion of the other end of the decontamination element so as to be in contact with an outer circumferential surface of one end of the coupling shaft protruding inward of the decontamination element,
Wherein one end of the connecting shaft projecting inward from the central portion of the other end of the decontamination element is coupled to the one end of the coupling tube by thermoplastic resin adhesive or soldering. A backfire prevention device.
6. The method of claim 5,
The body portion
Further comprising: a flame blocking flange supporting jaw formed on a side of an outlet of the gas supply passage, the flame blocking flange supporting jaw being formed between a space portion in which the quenching element is installed and the closing spring supporting step,
The over-
Contact with the flame blocking flange supporting jaw outside the other end of the flame-proofing element so as to prevent the flame from passing through between the outer circumferential surface of the one end of the connecting shaft and the other end of the flame-resistant element passing through the other end of the flame- Further comprising a fixed flame blocking flange,
Wherein the connection shaft passes through a central portion of the flame blocking flange,
Wherein the flame blocking flange is formed with a plurality of flange through holes in the circumferential direction around the connecting shaft passing through the central portion,
And a flange packing is provided between the other end of the decontamination element and the flame blocking flange so as to surround the outer circumferential surface of the connecting shaft.
KR1020150062293A 2015-05-01 2015-05-01 Back Fire Preventing Device having a Temperature Sensing Part KR101761903B1 (en)

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