CN2326799Y

CN2326799Y - Gas safety valve

Info

Publication number: CN2326799Y
Application number: CN 98209825
Authority: CN
Inventors: 金衍忠
Original assignee: DAI JIAXIU
Current assignee: DAI JIAXIU
Priority date: 1998-01-26
Filing date: 1998-01-26
Publication date: 1999-06-30
Anticipated expiration: 2008-01-26

Abstract

The utility model relates to a gas safety valve which belongs to the safety valve class and comprises a valve body, a valve handle assembly, a valve flap, an electromagnetic valve assembly and a thermocouple., wherein, the valve handle assembly is moved down to push the valve flap, and an armature in the electromagnetic valve assembly is moved down to contact an iron core. Under the condition of high temperature, an electric current generated by the thermocouple (5) makes the electromagnetic valve assembly attracted to keep the valve flap on, and the electromagnetic valve assembly is released to make the armature and the valve flap move up to cut off the gas supply. The valve flap in an opening state is positioned above a gas inlet, and a gap is arranged between the valve flap and a lower cavity. With simple structure, the utility model can automatically cut off the gas gap rapidly on the occasion that the stove implement is extinguished or a connecting pipe of the stove implement is broken.

Description

A kind of safety valves for gas

The utility model belongs to a kind of safety valve, the particularly a kind of and supporting safety valve of gas-fired boiler.

Along with improving constantly of China's rapid economy development and living standards of the people, coal gas and liquefied petroleum gas (LPG) are used more and more universal as domestic fuel.But easily cause accidents such as poisoning or blast in using combustion gas, trace it to its cause, mainly contain: 1. stove and accessory stops working owing to wind, water overflow, and does not in time close again, and combustion gas is flowed out in stove and accessory; 2. liquefied petroleum ga steel cylinder or pipeline break to the adapter of stove and accessory, and the unreal or rubber hose adapter of joint is blown, and gas leakage fast in the stove and accessory combustion process; 3. there is slow gas leakage at piped gas position after the total valve at family, and total valve closes not extremely or do not close gas leakage is progressively accumulated.At the top 1. reason, a kind of safety valve that utilizes thermocouple, solenoid valve to keep valve opening has appearred on market.This safety valve is disclosed in Chinese patent literature again afterwards.This safety valve is made up of valve body, valve rod assembly, flap, electromagnetic valve component, thermocouple, and when the solenoid valve dead electricity discharged, in-migration promoted to move on the flap Returnning spring on it on the armature by promoting, and keeps apart inlet hole and air outlet hole on the valve body; The valve rod that moves down under the external force effect promotes flap and moves down, and the armature on the solenoid valve is contacted with unshakable in one's determination, compress its Returnning spring simultaneously, combustion gas flows to air outlet hole from inlet hole flows out, the stove and accessory ignition, thermocouple at high temperature produces electric current, and that solenoid valve is got is electric, and its armature and iron core are pulled together, and flap remains in opening state.When the stove and accessory automatically extinguishing, the electric current that thermocouple produces reduces rapidly, and when solenoid valve electromagnetic attraction during less than the active force of Returnning spring, Returnning spring promotes to move on the flap by armature, cuts off the path of inlet hole and air outlet hole, closes source of the gas.This safety valve to 2. and 3. the accident potential that causes of reason can't be eliminated.

The purpose of this utility model provides a kind of combustion gas safety valve safe in utilization.

The utility model structure comprises valve body (1), valve rod assembly (2), flap (3), electromagnetic valve component (4), thermocouple (5); Electromagnetic valve component (4) is installed under the valve body (1) in the cavity (1B), the armature (4A) of its Returnning spring (4B) roof pressure upper end; Flap (3) places the top of armature (4A), and flap (3) upside is a sealing surface, and (1E) is complementary with valve seat, and the following cavity (1B) in valve seat (1E) below communicates with inlet hole (1A), and the upper plenum (1C) of valve seat (1E) top communicates with air outlet hole (1D); Valve rod assembly (2) places in the upper plenum (1C), and its valve rod (2D) is positioned at the top of flap (3); The valve rod that moves down under the external force effect (2D) pushing flap (3), armature (4A) are displaced downwardly to armature (4A) and contact with iron core in the electromagnetic valve component (4), while compression reseting spring (4B), the electric current that thermocouple under the high temperature condition (5) is produced makes electromagnetic valve component (4) adhesive, and armature (4A) keeps contacting with iron core; Electromagnetic valve component (4) discharges, its Returnning spring (4B) promotes to move to valve seat (1E) on armature (4A) and the flap (3) and contacts, its key problem in technology is the upper part that the flap (3) when opening state is positioned at inlet hole (1A) aperture, and the space (K) of a logical combustion gas is arranged between flap (3) and the following cavity (1B).

Described space (K) sectional area can be 7mm ²To 20mm ²

Aforesaid the when 1. reason occurs, can voluntarily close the same with prior art cut off source of the gas.When 2. reason occurs, stove and accessory may still burn away, the combustion gas excess is gone out fast, form bigger pressure difference up and down at flap (3), the deadweight that overcomes flap (3) promote immediately to move on the flap (3) contact with valve seat (1E) compress till, cut off source of the gas, spend 5 seconds to 10 seconds approximately afterwards, Returnning spring (4B) promotes to move on the armature (4A) again and withstands flap (3).

The utility model is designed the flap (3) of opening state and the relative position and the ventilation sectional area of inlet hole (1A) dexterously, make combustion gas in the normal combustion process, can be held open state, when excess is given vent to anger, cut off source of the gas immediately, when stove and accessory is flame-out, can close source of the gas rapidly, guarantee the safety that combustion gas is used.The utility model comes down to existing safety valves for gas principle is combined with the safety check principle, can play respectively when occurring aforementioned the and 1. in time close voluntarily during 2. former thereby gas leakage with the, cuts off source of the gas.It is simple in structure, and is reasonable in design, saves material simultaneously, reduces manufacture cost.

Fig. 1 is the utility model embodiment master sectional view.

Fig. 2 is a M-M half sectional view among Fig. 1.

Now in conjunction with the accompanying drawings the utility model is described in detail.Valve body (1) has the air outlet hole (1D) of inlet hole (1A), upper right side of lower-left side and upper plenum (1C), cavity (1B) down, upper plenum (1C) is the boundary with following cavity (1B) with valve seat (1E), inlet hole (1A) communicates with following cavity (1B), and air outlet hole (1D) communicates with upper plenum (1C).Flap (3) has a guide structure, is valve rod (2D) directly over it, is armature (4A) under the flap (3).Valve rod assembly (2) can comprise valve rod (2D), seal ring (2C), stage clip (2B) and press cover (2A), stage clip (2B) places in valve body (1) upper plenum (1C), its lower end is blocked by upper plenum (1C) pore-throat, withstand by cover (2A) upper end, valve rod (2D) with by the cover (2A) be fixed together, valve rod (2D) lower end diameter is bigger, puts seal ring (2C) backstop at upper plenum (1C) pore-throat downside, to form sealing.Electromagnetic valve component (4) structure comprises armature (4A), Returnning spring (4B), iron core, coil and connector element (4C), armature (4A) structure is " worker " font, its lower end surface places in the connector element (4C) mates (figure does not draw) with iron core, place Returnning spring (4B) between the same connector element in its upper-end surface (4C), and contact with flap (3).The electrical connection of electromagnetic valve component (4) and consistent with the connection and the prior art of thermocouple is not given unnecessary details.Flap (3) is in the top in inlet hole (1A) aperture when opening state, combustion gas is passed through from the space (K) between flap (3) and the following cavity (1B).Described space (K) sectional area can be 7mm ²To 20mm ², cavity (1B) and flap (3) diameter can suitably increase described sectional area under strengthening, and alleviate flap (3) deadweight and can suitably increase described sectional area.Otherwise, then should suitably reduce sectional area.Among the embodiment, selecting space (K) sectional area for use is 10mm ², at this moment can select down cavity (1B) diameter for use is 13mm, flap (3) periphery is circle (diameter is about 12.5mm).The utility model safety valve working procedure is: press by cover (2A), valve rod (2D) moves down, promoting flap (3) and armature (4A) moves down, (4A) contacts with iron core to armature, combustion gas enters from inlet hole (1A), arrive valve seat (1E) by the space (K) between flap (3) and following cavity (1B), flow out from air outlet hole (1D) again, light stove and accessory, thermocouple (5) at high temperature produces electric current, and it is electric that electromagnetic valve component is got, armature (4A) and iron core adhesive, flap (3) reaches normal air feed burning because of the deadweight effect remains on opening state.In case aforementioned 1. kind situation appearance, the electric current that thermocouple (5) produces reduces rapidly, and until being zero, armature (4A) moves on rapid under the effect of Returnning spring (4B), promotes to move to valve seat (1E) on the flap (3) to contact the cut-out source of the gas.In case aforementioned the when 2. the kind situation occurs, combustion gas is gone out from air outlet hole (1D), and pressure difference is bigger up and down to make flap (3), forms bigger pressure difference, overcomes the deadweight of flap (3), promotes to move on the flap (3), to contacting with valve seat (1E), cuts off source of the gas immediately.

In addition, on valve body (1) inlet hole (1A) hole wall, be fixedly connected with pressure gauge (6), see Fig. 2, to show the suction pressure of combustion gas.In case aforementioned when 3. the kind situation occurs, and closes stove and accessory earlier, closes the total valve of pipeline to the family again, the pressure that pressure gauge (6) shows can reduce by Zhejiang, remind customer inspection total valve each position afterwards, and adjusted reparation, keep stablizing constant for a long time until pressure gauge.(particularly northern user) seems extremely important between this kitchen for gas supply conduit and sealing, avoided slow gas leakage effectively and the accident that takes place.

Claims

1, a kind of safety valves for gas, structure comprise valve body (1), valve rod assembly (2), flap (3), electromagnetic valve component (4), thermocouple (5); Electromagnetic valve component (4) is installed under the valve body (1) in the cavity (1E), the armature (4A) of its Returnning spring (4B) roof pressure upper end; Flap (3) places the top of armature (4A), and flap (3) upside is a sealing surface, and (1E) is complementary with valve seat, and the following cavity (1B) in valve seat (1E) below communicates with inlet hole (1A), and the upper plenum (1C) of valve seat (1) top communicates with air outlet hole (1D); Valve rod assembly (2) places in the upper plenum (1C), and its valve rod (2D) is positioned at the top of flap (3); The valve rod that moves down under the external force effect (2D) pushing flap (3), armature (4A) are displaced downwardly to armature (4A) and contact with iron core in the electromagnetic valve component (4), while compression reseting spring (4B), the electric current that thermocouple under the high temperature condition (5) is produced makes the electromagnetic valve component adhesive, and armature (4A) keeps contacting with iron core; Electromagnetic valve component (4) discharges, its Returnning spring (4B) promotes to move to valve seat (1E) on armature (4A) and the flap (3) and contacts, it is characterized in that the flap (3) when opening state is positioned at the upper part in inlet hole (1A) aperture, the space (K) of a logical combustion gas is arranged between flap (3) and the following cavity (1B).

2, safety valve according to claim 1 is characterized in that described space (K) sectional area is 7mm ²To 20mm ²

3, safety valve according to claim 1 is characterized in that described space (K) sectional area is 10mm ²

4, safety valve according to claim 3 is characterized in that determining that long-pending following cavity (1B) diameter of described free cross-section is 13mm, and flap (3) periphery is circle.

5,, it is characterized in that on valve body (1) inlet hole (1A) hole wall, being fixedly connected with pressure gauge (6) according to claim 1 or 2 or 3 or 4 described safety valves.