CN110397811A - A kind of gas pipeline connection component - Google Patents

A kind of gas pipeline connection component Download PDF

Info

Publication number
CN110397811A
CN110397811A CN201910594742.4A CN201910594742A CN110397811A CN 110397811 A CN110397811 A CN 110397811A CN 201910594742 A CN201910594742 A CN 201910594742A CN 110397811 A CN110397811 A CN 110397811A
Authority
CN
China
Prior art keywords
connector
outer housing
gas pipeline
back taper
block
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
CN201910594742.4A
Other languages
Chinese (zh)
Inventor
张雁飞
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Individual
Original Assignee
Individual
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Individual filed Critical Individual
Priority to CN201910594742.4A priority Critical patent/CN110397811A/en
Publication of CN110397811A publication Critical patent/CN110397811A/en
Withdrawn legal-status Critical Current

Links

Classifications

    • AHUMAN NECESSITIES
    • A62LIFE-SAVING; FIRE-FIGHTING
    • A62CFIRE-FIGHTING
    • A62C4/00Flame traps allowing passage of gas but not of flame or explosion wave
    • A62C4/02Flame traps allowing passage of gas but not of flame or explosion wave in gas-pipes
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16LPIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
    • F16L15/00Screw-threaded joints; Forms of screw-threads for such joints
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16LPIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
    • F16L33/00Arrangements for connecting hoses to rigid members; Rigid hose connectors, i.e. single members engaging both hoses
    • F16L33/22Arrangements for connecting hoses to rigid members; Rigid hose connectors, i.e. single members engaging both hoses with means not mentioned in the preceding groups for gripping the hose between inner and outer parts
    • F16L33/23Arrangements for connecting hoses to rigid members; Rigid hose connectors, i.e. single members engaging both hoses with means not mentioned in the preceding groups for gripping the hose between inner and outer parts the outer parts being segmented, the segments being pressed against the hose by tangentially arranged members

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Health & Medical Sciences (AREA)
  • Public Health (AREA)
  • Business, Economics & Management (AREA)
  • Emergency Management (AREA)
  • Joints Allowing Movement (AREA)

Abstract

The invention belongs to pipeline connection area and disclose a kind of gas pipeline connection component, outer housing is hollow circular tube type structure, the first end of outer housing is equipped with back taper connector, the second end of outer housing is equipped with the first connector, the outside of first connector is equipped with external screw thread, back taper connector is connect with gas hose, and the first connector is welded on outer housing;First connector is connected through a screw thread with connection pieces for gas pipeline;The end of connection pieces for gas pipeline is fixed with the second connector, and the second connector shape is circular ring structure;Third connector is arranged on outer housing;Outer housing bosom position is equipped with fire-retardant core, and fire-retardant core is equipped with several transfer ports close to back taper connector one end, and the centre of transfer port is equipped with cavity, orbicule is equipped in cavity, and cavity is equipped with reticular membrane close to one end of back taper connector.Apparatus of the present invention connection sealing energy is good, tempering resistance is excellent, easy to connect, is with a wide range of applications.

Description

A kind of gas pipeline connection component
Technical field
The present invention relates to technical field of pipeline connection, and in particular to a kind of gas pipeline connection component.
Background technique
Natural gas line in the prior art is attached often through steel variable-diameter interface, and common natural in market Feed channel and gas-cooker sealing joint component are only arranged a screwing screw and pass through one after connecting steam line at pipe joint The rotation of a screwing screw is fixed, and often will appear that rotation is not close, and screw hair situation is deposited in accessing user's use process In gas leakage security risk, the problem of quick detachable installation is not allowed;And this structure is in the transmission process of combustion gas, often with Pressure instability, it is insufficient that such as direct use will cause combustion of natural gas, it may appear that the intermittent phenomenon of natural gas;Additionally, due to Its is relatively simple for structure, kitchen range is flame-out or ignition process in be easy to happen tempering phenomenon fire accident.In consideration of it, How to provide a kind of good connection sealing energy, anti-backfire, convenient and fast gas pipeline connection component easy to connect is art technology Personnel's technical issues that need to address.
Summary of the invention
The present invention is for gas pipeline connection component sealing performance is incomplete in the prior art, tempering resistance is poor, connects Not convenient enough problem is connect, and a kind of gas pipeline connection component is provided.
The present invention using following technical scheme in order to solve the above technical problems, realized:
Design a kind of gas pipeline connection component, including outer housing, it is characterised in that: the outer housing is hollow circular tube type Structure, the first end of the outer housing are equipped with back taper connector, and the second end of the outer housing is equipped with the first connector, and described the The outside of a connection piece is equipped with external screw thread, and the back taper connector is connect with gas hose, and the side of first connector is set There is block, the block is circular ring structure, and first connector is welded on outer housing;First connector and fuel gas conduit Pipe connecting is connected through a screw thread;The end of the connection pieces for gas pipeline is fixed with the second connector, second connector Shape is circular ring structure;It is arranged with third connector on the outer housing, the third connector is cirque structure, described the The diameter of three connectors is identical as the second connector and is greater than the diameter of block, on second connector and third connector Equipped with several corresponding through-holes, and second connector and third connector are fixed in one by passing through the bolt of through-hole It rises;
Outer housing bosom position is equipped with fire-retardant core, and the fire-retardant core is equipped with several close to back taper connector one end A transfer port, the centre of the transfer port are equipped with cavity, are equipped with orbicule in the cavity, and cavity is close to back taper connector One end is equipped with reticular membrane, and the reticular membrane passes through for combustion gas and avoids the transfer port of orbicule blocking back taper joint side;Institute It states fire-retardant core and is equipped with strainer far from back taper connector one end;
Nut is arranged on the gas hose, and in the gas hose of the back taper connector and gas hose junction It is arranged with seal pipe outside, is arranged with the identical semi-cylindrical screw rod of two structures outside the seal pipe, wherein semi-cylindrical screw rod It is connected with obtained by hexagonal clamp device splits from the middle position of hollow cylinder upper surface by hollow cylinder screw rod one end Structure, first side of nut is connected through a screw thread with semi-cylindrical screw rod;
The pressure ring of cirque structure is equipped in described nut second side inner cavity, the pressure ring is by two groups of symmetrically arranged semicircles Shape pressure ring forms, and sliding block is fixed in the middle part of semicircle pressure ring, and the section of the sliding block is T shape structure, the sliding block and setting T shape sliding slot on nut second side inner wall is adapted, and the T shape sliding slot is tilted structure.
Preferably, the connection pieces for gas pipeline is connect by triple valve with gas pipeline.
Preferably, the block is equipped with the seal boss of circular ring shape, is arranged with rubber washer on the first connector, described Rubber washer is extruded on block between seal boss and the second connector.
Preferably, there are five the transfer port is set, one of transfer port is located at the intracorporal middle position of shell, other four Transfer port is configured around intermediate transfer port.
Preferably, second connector of third connector is equipped with groove identical with block shape;Described second connects When fitting and third connector are bolted, block is embedded in the groove of third connector.
Preferably, the joint face of the identical semi-cylindrical screw rod of described two structures is equipped with used for positioning raised and recessed Slot.
A kind of gas pipeline connection component proposed by the present invention, beneficial effect are:
(1) outer housing one end of gas pipeline connection component of the present invention is equipped with back taper connector, when taper joint and combustion gas When kitchen range is connected by gas hose, seal pipe and gas hose are pressed on by back taper by the pressure ring of two groups of semi-circular shape and connect On head, improve gas hose and back taper connector sealing performance, and the semi-cylindrical screw rod being set in outside seal pipe with spiral shell Mother is very easy to disassembly after unclamping, connection structure has that good seal performance, connection disassembling are convenient easily, replacement is easily beneficial Effect;
(2) the first connector of outer housing is connected through a screw thread with connection pieces for gas pipeline in apparatus of the present invention, then again It is fixed together with the second connector by passing through the bolt of through-hole by the third connector being set on outer housing, first Connector and connection pieces for gas pipeline further improve gas pipeline connection component and fuel gas conduit on the basis of being connected through a screw thread The connection sealing effect of pipe connecting, and since it is bolted, facilitates installation and replacement, and without profession when installation and replacement Tool;
(3) the outer housing bosom position of gas pipeline connection component of the present invention is equipped with fire-retardant core, and fire-retardant core is close to Taper joint one end is equipped with several transfer ports, and the centre of transfer port is equipped with cavity, is equipped with orbicule in cavity, and cavity is close One end of back taper connector is equipped with reticular membrane, and when tempering phenomenon occurs, the combustion gas of back taper tip side is instantaneously burnt High-pressure high-temperature environment is formed, orbicule is pushed at the transfer port of connection pieces for gas pipeline one end by hyperbaric environment, by transfer port Blocking avoids tempering from further extending in gas pipeline, and the fire-retardant core being arranged further improves gas pipeline connection component Fire resistances, apparatus of the present invention structure is simple, and tempering resistance is good;
(4) apparatus of the present invention connection sealing energy is good, tempering resistance is excellent, easy to connect, can effectively improve gas-cooker The safety connecting with pipeline, is with a wide range of applications.
Detailed description of the invention
The present invention is described in further detail for embodiment in reference to the accompanying drawing, but does not constitute to of the invention Any restrictions.
Fig. 1 is the structural schematic diagram of apparatus of the present invention;
Fig. 2 is that block in apparatus of the present invention, the first connector, connection pieces for gas pipeline, the second connector are connected with third The connection relationship diagram of part;
Fig. 3 is the structural schematic diagram of third connector in apparatus of the present invention;
Fig. 4 is the schematic view of the front view of third connector in apparatus of the present invention;
Fig. 5 is the section structural schematic diagram of transfer port in the embodiment of the present invention;
Fig. 6 is the explosion of gas hose in apparatus of the present invention, nut, back taper connector, seal pipe and semi-cylindrical screw rod Structural schematic diagram;
Fig. 7 is the structural schematic diagram of block in the present invention.
Fig. 8 is the connection schematic diagram of pressure ring and nut in the present invention.
Fig. 9 is position view of the pressure ring before wearing seal pipe in the present invention.
Figure 10 is the left view schematic diagram of pressure ring in the present invention.
Figure 11 is position view when orbicule works normally in the embodiment of the present invention;
Figure 12 is position view of the orbicule in annealed strip in the embodiment of the present invention.
In figure: outer housing 1, back taper connector 2, block 3, the first connector 4, connection pieces for gas pipeline 5, the second connector 6, third connector 7, through-hole 8, fire-retardant core 9, transfer port 10, cavity 11, orbicule 12, reticular membrane 13, gas hose 14, nut 15, seal pipe 16, semi-cylindrical screw rod 17, pressure ring 18, sliding block 19, sliding slot 20.
Specific embodiment
Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, complete Site preparation description, it is clear that described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.
- Figure 10 refering to fig. 1, a kind of gas pipeline connection component of the invention, including outer housing 1, it is characterised in that: described Outer housing 1 is hollow circular tube type structure, and the first end of the outer housing 1 is equipped with back taper connector 2, the second of the outer housing 1 End is equipped with the first connector 4, and the outside of first connector 4 is equipped with external screw thread, the back taper connector 2 and gas hose 14 Connection, the side of first connector 4 are equipped with block 3, and the block 3 is circular ring structure, and first connector 4 is welded on On outer housing 1;First connector 4 is connected through a screw thread with connection pieces for gas pipeline 5;The connection pieces for gas pipeline 5 End is fixed with the second connector 6, and 6 shape of the second connector is circular ring structure;Third company is arranged on the outer housing 1 Fitting 7, the third connector 7 are cirque structure, and the diameter of the third connector 7 and the second connector 6 are identical and big In the diameter of block 3, several corresponding through-holes 8, and described are equipped on second connector 6 and third connector 7 Two connectors 6 and third connector 7 are fixed together by passing through the bolt of through-hole 8;
The 1 bosom position of outer housing is equipped with fire-retardant core 9, and the fire-retardant core 9 is set close to 2 one end of back taper connector There are several transfer ports 10, the centre of the transfer port 10 is equipped with cavity 11, orbicule 12 is equipped in the cavity 11, and empty Chamber 11 is equipped with reticular membrane 13 close to one end of back taper connector 2, and the reticular membrane 13 passes through for combustion gas and avoids orbicule 12 Block the transfer port 10 of 2 side of back taper connector;The fire-retardant core 9 is equipped with strainer far from 2 one end of back taper connector;
Nut 15 is arranged on the gas hose 14, and in the back taper connector 2 and 14 junction of gas hose It is arranged with seal pipe 16 outside gas hose 14, is arranged with the identical semi-cylindrical screw rod 17 of two structures outside the seal pipe 16, Wherein semi-cylindrical screw rod 17 is connected with hexagonal clamp device from hollow cylinder upper surface by hollow cylinder screw rod one end Obtained structure is splitted in middle position, and 15 first side of nut is connected through a screw thread with semi-cylindrical screw rod 17;
The pressure ring 18 of cirque structure is equipped in 15 second side inner cavity of nut, the pressure ring 18 is symmetrical arranged by two groups Semicircle pressure ring composition, sliding block 19 is fixed in the middle part of semicircle pressure ring, the section of the sliding block 19 is T-shaped structure, described Sliding block 19 is adapted with the T shape sliding slot 20 being arranged on 15 second side inner wall of nut, and the T shape sliding slot 20 is tilted structure.
The connection pieces for gas pipeline 5 is connect by triple valve with gas pipeline.
The block 3 is equipped with the seal boss of circular ring shape, is arranged with rubber washer, the rubber on the first connector 4 Washer is extruded on block 3 between seal boss and the second connector 6.
There are five the transfer port 10 is set, one of transfer port 10 is located at the middle position in outer housing 1, and other four is defeated Stomata 10 is configured around intermediate transfer port 10.
7 second connector 6 of third connector is equipped with groove identical with 3 shape of block;Second connector 6 When being bolted with third connector 7, block 3 is embedded in the groove of third connector 7.
The joint face of the identical semi-cylindrical screw rod 17 of described two structures is equipped with protrusion used for positioning and groove.
The working principle of the invention is:
1 one end of outer housing of gas pipeline connection component of the present invention is equipped with back taper connector 2, when taper joint 2 and combustion gas When kitchen range is connected by gas hose 14,16 sets of the seal pipe outsides in gas hose 14, seal pipe 16 and gas hose 14 are worn Nut 15 is crossed, two semi-cylindrical screw rods 17 cover to be closed in the outside of seal pipe 16, rotates two semi-cylindrical spiral shells by spanner Bar 17, when the end of the end of two semi-cylindrical screw rods 17 and pressure ring 18 contacts, two semi-cylindrical screw rods 17 push pressure Ring 18, the pressure ring of two groups of semi-circular shape 20 sliding along the chute, until the end contact of the pressure ring of two groups of semi-circular shape, at this time pressure ring 18 are pressed on seal pipe 16 and gas hose 14 on back taper connector 2, improve the sealing of gas hose 14 and back taper connector 2 Performance, and the semi-cylindrical screw rod 17 being set in outside seal pipe 16 is very easy to disassembly, connection knot after unclamping with nut 15 Structure has the convenient light, replacement of good seal performance, connection disassembling easily beneficial effect;1 other end of outer housing is equipped with 3 He of block First connector 4, the first connector 4 are connected through a screw thread with connection pieces for gas pipeline 5, and the seal boss on block 3 will seal Circle is pressed on the second connector 6, forms two seals;By the way that third connector 7 is arranged, can be good at playing protection work With, avoid 4 stress of the first connector damage.
The 1 bosom position of outer housing of gas pipeline connection component of the present invention is equipped with fire-retardant core 9, and fire-retardant core 9 is close to 2 one end of taper joint is equipped with several transfer ports 10, and the centre of transfer port 10 is equipped with cavity 11, is equipped with orbicule in cavity 11 12, and cavity 11 is equipped with reticular membrane 13 close to one end of back taper connector 2;Refering to shown in attached drawing 11, when normal work, pass through combustion Tracheae pipe connecting 5 conveys the high pressure combustion gas to come by fire-retardant core 9, transfer port 10, cavity 11, and orbicule 12 is by high pressure Combustion gas is blown on reticular membrane 13;Refering to shown in attached drawing 12, when tempering phenomenon occurs, the combustion gas at 2 end of back taper connector is instantaneous It carries out burning and forms high-pressure high-temperature environment, orbicule 12 is pushed to the transfer port of 5 one end of connection pieces for gas pipeline by hyperbaric environment At 10, tempering is avoided to further extend in gas pipeline the blocking of transfer port 10, and the fire-retardant core 9 being arranged further improves The Fire resistances of gas pipeline connection component.
The foregoing is only a preferred embodiment of the present invention, but scope of protection of the present invention is not limited thereto, Anyone skilled in the art in the technical scope disclosed by the present invention, according to the technique and scheme of the present invention and its Inventive concept is subject to equivalent substitution or change, should be covered by the protection scope of the present invention.

Claims (6)

1. a kind of gas pipeline connection component, including outer housing (1), it is characterised in that: the outer housing (1) is hollow circular tube type The first end of structure, the outer housing (1) is equipped with back taper connector (2), and the second end of the outer housing (1) is equipped with the first connection The outside of part (4), first connector (4) is equipped with external screw thread, and the back taper connector (2) connect with gas hose (14), The side of first connector (4) is equipped with block (3), and the block (3) is circular ring structure, the first connector (4) weldering It connects on outer housing (1);First connector (4) is connected through a screw thread with connection pieces for gas pipeline (5);The gas pipeline The end of connector (5) is fixed with the second connector (6), and the second connector (6) shape is circular ring structure;The outer housing (1) be arranged on third connector (7), the third connector (7) be cirque structure, the third connector (7) it is straight Diameter is identical as the second connector (6) and is greater than the diameter of block (3), on second connector (6) and third connector (7) Equipped with several corresponding through-holes (8), and second connector (6) and third connector (7) pass through the spiral shell across through-hole (8) Bolt is fixed together;
Outer housing (1) the bosom position is equipped with fire-retardant core (9), and the fire-retardant core (9) is close to back taper connector (2) one end Equipped with several transfer ports (10), the centre of the transfer port (10) is equipped with cavity (11), is equipped in the cavity (11) spherical Body (12), and cavity (11) is equipped with reticular membrane (13) close to the one end of back taper connector (2), the reticular membrane (13) is used for combustion gas Pass through and avoid the transfer port (10) of orbicule (12) blocking back taper connector (2) side;The fire-retardant core (9) connects far from back taper Head (2) one end is equipped with strainer;
It is arranged with nut (15) on the gas hose (14), and is connect in the back taper connector (2) with gas hose (14) It is arranged with seal pipe (16) outside the gas hose (14) at place, the identical semicolumn of two structures is arranged with outside the seal pipe (16) Shape screw rod (17), wherein semi-cylindrical screw rod (17) is connected with hexagonal clamp device from open circles by hollow cylinder screw rod one end Obtained structure is splitted in the middle position in cylindrical upper end face, and (15) first side of nut passes through with semi-cylindrical screw rod (17) It is threadedly coupled;
The pressure ring (18) of cirque structure is equipped in nut (15) second side inner cavity, the pressure ring (18) is symmetrically set by two groups The semicircle pressure ring set forms, and is fixed with sliding block (19) in the middle part of semicircle pressure ring, and the section of the sliding block (19) is T shape knot Structure, the sliding block (19) are adapted with the T shape sliding slot (20) being arranged on nut (15) second side inner wall, the T shape sliding slot It (20) is tilted structure.
2. a kind of gas pipeline connection component according to claim 1, which is characterized in that the connection pieces for gas pipeline (5) It is connect by triple valve with gas pipeline.
3. a kind of gas pipeline connection component according to claim 1, which is characterized in that the block (3) is equipped with annulus The seal boss of shape, is arranged with rubber washer on the first connector (4), the rubber washer be extruded on block (3) seal it is convex Between platform and the second connector (6).
4. a kind of gas pipeline connection component according to claim 1, which is characterized in that the transfer port (10) is equipped with five A, one of transfer port (10) is located at the middle position in outer housing (1), and other four transfer port (10) surrounds intermediate transfer port (10) it is configured.
5. a kind of gas pipeline connection component according to claim 1, which is characterized in that the third connector (7) second Connector (6) is equipped with groove identical with block (3) shape;Second connector (6) and third connector (7) pass through spiral shell It tethers when connecing, block (3) is embedded in the groove of third connector (7).
6. a kind of gas pipeline connection component according to claim 1, which is characterized in that the identical semicircle of described two structures The joint face of cylindricality screw rod (17) is equipped with protrusion used for positioning and groove.
CN201910594742.4A 2019-07-03 2019-07-03 A kind of gas pipeline connection component Withdrawn CN110397811A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201910594742.4A CN110397811A (en) 2019-07-03 2019-07-03 A kind of gas pipeline connection component

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201910594742.4A CN110397811A (en) 2019-07-03 2019-07-03 A kind of gas pipeline connection component

Publications (1)

Publication Number Publication Date
CN110397811A true CN110397811A (en) 2019-11-01

Family

ID=68324072

Family Applications (1)

Application Number Title Priority Date Filing Date
CN201910594742.4A Withdrawn CN110397811A (en) 2019-07-03 2019-07-03 A kind of gas pipeline connection component

Country Status (1)

Country Link
CN (1) CN110397811A (en)

Similar Documents

Publication Publication Date Title
CN202140719U (en) Quick connector for corrugated tube
CN110397811A (en) A kind of gas pipeline connection component
CN107940095B (en) Multifunctional gas self-closing valve
CN208764522U (en) A kind of explosion-proof pipe joint
CN206081438U (en) Fire hydrant water pressure detection device
CN210566876U (en) Gas pipeline coupling assembling
CN203297705U (en) Fuel gas valve and double-gas-source fuel gas system
CN213361402U (en) Instrument heat tracing pipe assembly and replacing and connecting device thereof
CN206762098U (en) The special Quick open-close type fire hydrant of corridor
CN205331654U (en) Ball -type compensator
CN103148240A (en) Dual gas source control valve and dual gas source control system
CN203718245U (en) Transparent fast joint sleeve barrel joint adopting redundant sealing technology
CN208348741U (en) High-pressure hose Hough connector
CN207279632U (en) A kind of ever-burning flame anoxia protection arrangement
CN205090127U (en) It connects to prevent tearing open reduced tee
RU137590U1 (en) BALL VALVE
KR200380106Y1 (en) 360°rotation nozzle for oxygen cutting machine
CN208457388U (en) A kind of air-conditioning pipeline fast joint
CN205118319U (en) Single diaphragm holds pressure relief valve
CN206036483U (en) Sealed water injection well choke and sealed water -cooling board
CN107654706B (en) A kind of self-locking flow control valve
CN212779476U (en) Explosion-proof leakage contact fluviograph
CN110947130B (en) Hand-held fire extinguishing device for horizontal pipeline liquid jet fire
RU198025U1 (en) FIRE HOSE INSERT
CN203926975U (en) A kind of accident extinguishment of gas stove protection valve

Legal Events

Date Code Title Description
PB01 Publication
PB01 Publication
WW01 Invention patent application withdrawn after publication
WW01 Invention patent application withdrawn after publication

Application publication date: 20191101