CN2285418Y

CN2285418Y - Safety plug

Info

Publication number: CN2285418Y
Application number: CN 96222027
Authority: CN
Inventors: 潘咏浚
Original assignee: Individual
Current assignee: Individual
Priority date: 1996-10-21
Filing date: 1996-10-21
Publication date: 1998-07-01
Anticipated expiration: 2006-10-21

Abstract

The utility model provides a safety plug suitable for low pressure medium and small sized boilers, which is characterized in that eutectic structure type metal is fixedly connected with the lower end of a plug body which can be in direct contact with the steam in a boiler, and a heat insulating plug made of heat insulating material is fixedly arranged at the top of a plug body through hole and adjacent to the atmosphere. The structure is used for decreasing the temperature difference gradient between the eutectic structure type metal and the steam to achieve a pressure value which is under accurate control and is safe; the protection mode of using the eutectic structure type metal for fusion and pressure relief induces that the factors such as water quality, maintenance technique, etc. no longer influence on the operating safety, and the utility model has the advantage of simple fabrication process and is suitable for wide areas where the technique condition is poor and the water quality is bad.

Description

Flame-arrester vent plug

The utility model relates to a kind of safety device with fracturing member, particularly a kind of safety device with fusible joint.Be applicable to the low pressure medium small boiler.

Existing boiler safety valve generally adopts pressure control mechanical type to open the safety valve of release of pressure, its manufacturing, operation technique are known by general operation person, and its service life is also longer, but this kind valve member, because metal erosion and incrustation scale etch may make valve events malfunctioning, especially in the relatively poor area of some technical conditions, maintenance is not good at, and its water quality extreme difference and do not have control techniques, the malfunctioning major accident of the bursting of boilers that causes of valve events also happens occasionally; For avoiding the problems referred to above, the break safety device of barrier film of employing, can solve the disadvantage that factors such as corrosion, incrustation scale obstruction are brought theoretically, but there is big difficulty in the manufacturing of film, normally dash in metallic film and establish the circle that breaks, the precision of its punching out degree of depth directly influences the size of controlled pressure, sets about from the existing mechanical manufacturing technology, it is extremely difficult wanting the high-precision micro-punching out degree of depth of cheap acquisition, therefore is difficult in the medium small boiler and promotes the use of.Fusible plug is as safety device, also be widely used, in particular for the pressure cooker of cooker, but this kind structure, its fusible metal all is arranged on the top of plug, be that fusible metal one side contacts with steam, opposite side contacts with atmosphere, and adding guide hole has a segment distance again, and the thermograde between fusible metal and the actual steam is bigger, therefore the precision of controlled pressure is not high, the time explosion accident of build-up of pressure pot arranged.

The purpose of this utility model is that a kind of flame-arrester vent plug will be provided, and it can accurately control the force value that guarantees safety, is not subjected to water quality impact, and technical maintenance requires lower, and its manufacturing process product quality simple and easy to control.

The utility model is achieved in that eutectic junction type metal is fixed in the cock body low side that can directly contact with the boiler inner vapor, and the top that cock body through hole and atmosphere are adjacent sets firmly the heat insulation plug that a heat-barrier material is made.

The inboard directly contact of eutectic junction type metal of the present utility model steam; and there have heat insulation plug to stop in the outside to be heat insulation; the temperature gradient of its heat transfer will be reduced to minimum; thereby its melting temperature can accurately be reacted boiler inner vapor temperature; reach the accurate force value control that guarantees safety; the protected mode that adopts eutectic junction type Metal Melting to separate release of pressure; the pollution corrosion of water; factors such as incrustation can not influence it and guarantee safe functioning; and technical attendant there is not specific (special) requirements; energy adaptive technique level is lower; the wide geographic area that water quality is relatively poor; flame-arrester vent plug is simple in structure; number of spare parts is few; it is lower that machining requires, and reaches the quality requirement of product easily and do not increase manufacturing cost.

The concrete structure of utility model is provided by following examples and accompanying drawing thereof.

Fig. 1 is the longitudinal section of the utility model flame-arrester vent plug.

Fig. 2 is a fixedly schematic diagram of eutectic junction type metal solder.

Fig. 3 is the cock body polycrystalline substance schematic diagram for eutectic junction type metal pressing and fixing.

With reference to Fig. 1, the cock body 1 of flame-arrester vent plug is plug screw shape structure, its pipe taper thread section 10 is used to be combined on boiler wall portion, with the state lower seal that keep-ups pressure, through hole 11 is established at cock body 1 middle part of flame-arrester vent plug, through hole 11 ends that boiler is stretched in the bottom of cock body 1 set firmly eutectic junction type metal 5, and keep eutectic junction type metal 5 directly to contact with the boiler inner vapor, influence the accuracy of safe pressure in the eutectic junction type metal 5 control boilers to avoid the heat transfer temperature gradient; Eutectic junction type metal 5 is arranged at through hole 11 bottoms, can be fixedly welded on cock body 1 at its bottom perimeter as Fig. 2, also can the pressing and fixing mode, as shown in Figure 3, establish a groove 12 in cock body 1 through hole 11 bottoms, eutectic junction type metal 5 is pressed into through hole 11 and groove 12, and make it form bulge loop band 51 in the extruding of its two ends, as Fig. 15 sealings of eutectic junction type metal are mounted in the through hole 11 and groove 12 of cock body 1, the fixed form of eutectic junction type metal 5 also is fixedly welded on cock body 1 after the pressing again, as shown in Figure 1, set firmly a heat insulation plug 2 on cock body 1 through hole 11 tops adjacent with atmosphere, at through

hole

11,5 on heat insulation plug 2 and eutectic junction type metal form a sealing insulated space, to reach the purpose that the thermograde that further reduces eutectic junction type metal 5 improves control safe pressure value precision; Heat insulation plug 2 can gently compel to close fit system and be fixed in through hole 11, also can glue bond in the through hole 11 of cock body 1.

Claims

1, a kind of flame-arrester vent plug, form by cock body and eutectic junction type metal, it is characterized in that: eutectic junction type metal (5) is fixed in cock body (1) low side that can directly contact with the boiler inner vapor, and the top that cock body (1) through hole (11) is adjacent with atmosphere sets firmly the heat insulation plug (2) that a heat-barrier material is made.

2, flame-arrester vent plug according to claim 1 is characterized in that eutectic junction type metal (5) is fixedly welded on cock body (1).

3, flame-arrester vent plug according to claim 1 is characterized in that eutectic junction type metal (5) is pressed on cock body (1), and bulge loop band (51) build-in of eutectic junction type metal (5) is in the groove (12) of cock body (1).

4, flame-arrester vent plug according to claim 1 is characterized in that being fixedly welded on cock body (1) again after eutectic junction type metal (5) pressing.

5, flame-arrester vent plug according to claim 1, it is characterized in that heat insulation plug (2) light keying fit in cock body (1) or with glue bond in cock body (1).