CN102966983A

CN102966983A - Gas appliance

Info

Publication number: CN102966983A
Application number: CN201210319344XA
Authority: CN
Inventors: 周志深; 罗尚礼
Original assignee: Hong Kong and China Gas Co Ltd
Current assignee: Hong Kong and China Gas Co Ltd
Priority date: 2011-09-01
Filing date: 2012-08-31
Publication date: 2013-03-13
Also published as: CN105674343A; CN203024195U; HK1166441A2; HK1222705A1; CN105674343B

Abstract

The gas appliance (100) has a pilot burner (300) and a main burner (200) with respective gas channels (310&210) for supplying gas thereto under control of a solenoid valve assembly (600). The valve assembly (600) has a first valve (610) for controlling the supply of gas to at least the first gas passage (310), a second valve (620) for controlling the supply of gas to the second gas passage (210), a button (630) for opening the first valve (610) first with depression and then the second valve (620) with release, and a solenoid (640) for keeping the first valve (610) open. The appliance (100) comprises a flame ionization detector (700) for flame detection, and an electronic control unit (800) in electrical connection with the detector (700) and the coil (640) for causing the coil (640) to keep the first valve (610) open as long as the detector (700) detects a flame.

Description

Gas appliance

Technical field

The present invention relates generally to especially but is not the gas appliance that ad hoc is used for the cooking or prepares food.

Background technology

Gas appliance utilizes domestic gas, natural gas, propane, butane, liquefied petroleum gas or any other suitable fuel gas to act as a fuel usually.For the reason of safety, gas appliance usually comprises flame interruption or explosion-protection equipment and enters the combustion zone or leak in the atmosphere in order to prevent unlit gas.The accumulation of fuel gas is adventurous.

Just as known in the art, explosion-protection equipment comes work by cutting off gas source during without flame in can situation below:

-main burner or fire guider fail to light when applying igniting; And

-after lighting, main burner or fire guider extinguish.

Exist different modes to detect the existence of gas appliance Flame.At them wherein, the most general method is to utilize:

-detection comes from the thermocouple wire (being most commonly used to commercial and household cooking equipment in Hong Kong and China) of the heat of flame; And

-flame ion detects (FID) system or flame rectification (FR) system, in order to detect the intermediate ion that is produced by flame during hydrocarbon combustion.

Although BS EN-203 standard-required in flame, have no progeny less than 60 seconds internal cutting off sources of the gas, should lack as much as possible break time in order to leakage and the accumulation of fuel gas (and toxic gas in some cases) in apparatus or in the closed environment minimized.

The present invention seeks to provide a kind of new or opposite improved gas appliance, and it is very fast to the reaction that flame interrupts.

Summary of the invention

According to the present invention, a kind of gas appliance is provided, and it comprises the combustion zone, keeps the fire guider of pilot flame in the combustion zone, lights gas in the combustion zone take the main burner of generation heat and respectively via the gas supply entrance of first and second gas passage as fire guider and main burner supply gas.Electromagnetic valve component is arranged between gas supply entrance and first and second gas passage, to be used for control to first and second gas passage supply gas.Electromagnetic valve component have for control to the first valve of at least the first gas passage supply gas, be used for control to the second valve of the second gas passage supply gas, be used at first opening the first valve along with manual operation and open subsequently the manual station of second valve along with release and be used for the calutron that keeps the first valve to open.Gas appliance comprises and is adjacent to the fire guider setting with the flame ionization detector that exists for detection of pilot flame and the electronic control unit that is connected with the calutron circuit with flame ionization detector, to be used for just making calutron keep the first valve to open as long as flame ionization detector detects existing of pilot flame.

In specific embodiment, upwards open the combustion zone, and cooking appliance will be placed in the above to be used for heat food.

Preferably, manual station is configured at first open the first valve and close second valve along with manual operation, and opens second valve along with release subsequently, and the first valve is stayed open by calutron simultaneously.

Preferably, the first valve comprises normally closed solenoid valve.

Preferably, second valve comprises and often opens manual operating valve.

In a preferred embodiment, the first valve is arranged on the upstream of first and second gas passage, and can operate the gas that flows to first and second gas passage for cut-out.

More specifically, second valve is arranged on the upstream of the second gas passage, the downstream of the first gas passage, and can operate the gas that flows to the second gas passage for cut-out.

Favourable, electromagnetic valve component has single housing, and it holds first and second valve simultaneously.

Preferably, electromagnetic valve component comprises sensor, and it is used for opening of sensing the first valve, and is used for along with the opening of the first valve that senses, and the operation of pilot spark generator is to light fire guider.

Further preferably, this sensor is configured to opening of with reference to the operating position of manual station sensing the first valve.

Further preferably, spark generator is connected to electronic control unit being used for by its operation, and sensor is connected to electronic control unit, to be used for the operation via electronic control unit pilot spark generator.

Preferably, gas appliance comprises manual main air valve, and it is arranged on the second gas passage between electromagnetic valve component and the main burner, the gas that flows to main burner along the second gas passage is controlled being used for.

More specifically, manually main air valve comprises sensor, and it is used for the closing position of the manual main air valve of sensing, and as the operation of response with the permission spark generator.

Still more preferably, this sensor is connected to electronic control unit, to be used for allowing via electronic control unit the operation of spark generator.

Still more preferably, this sensor is connected to electronic control unit, to be used for operating electronic control unit by opening power supply, allows the operation of spark generator via electronic control unit.

Preferably, gas appliance comprises manual main air valve, and it is arranged on the second gas passage between calutron assembly and the main burner, flows to the gas of main burner along the second gas passage to be used for manual adjustments.

Description of drawings

Fig. 1 is according to of the present invention, with the gas-cooker form, the front view of the embodiment of gas appliance;

Fig. 2 is the left side view of the gas-cooker of Fig. 1;

Fig. 3 is the cross sectional side view of partial combustion system of the gas-cooker of Fig. 1, and it comprises main burner and fire guider and relevant gas pipeline;

Fig. 4 is the schematic diagram of the combustion system with main burner and gas pipeline of Fig. 3, and it is included in relevant air valve, igniter and the flame ionization detector under the electronic control unit control;

Fig. 5 is the functional block diagram of the combustion system of Fig. 4; And

Fig. 6 is the operational flowchart of the operation of the combustion system of explaination Fig. 4.

The specific embodiment

Whole Fig. 1-6 with reference to the accompanying drawings, show a kind of with gas-cooker 100 forms, embody gas appliance of the present invention, this gas-cooker has shell 110, it comprises combustion zone or the combustion chamber 120 of upwards opening, and is placed on it such as the kitchen tools of frying pan 90 and comes therein cooking food to be used for heating.Shell 110 is generally rectangular and is positioned on four pillars 114, and it has flat furnace top surface 111, and combustion chamber 120 is located therein.Usually has the upper opening that centered on by toroidal support 121 to be used for location frying pan 90 by columniform combustion chamber 120.

Gas-cooker 100 comprises as the part of its combustion system: main burner 200, and its center that is positioned at combustion chamber 120 produces heat to be used for burning gases; Fire guider 300, it is adjacent to main burner 200 to be used for keeping pilot flame; And flue 130, it is communicated with to be used for discharging the waste gas of

burner

200 and 300 places gas combustion generation with combustion chamber 120.

The structure 140 that is positioned at the general cylindrical of combustion chamber 120 central inner is positioned at and is centered around around main burner 200 and the fire guider 300 from gas supply entrance 900 to the main gas tube road (passage) 210 of the separately level of

burner

200 and 300 supply gas and the gas pipeline that ignites (passage) 310 with being respectively applied to.Pass the vertical air pipeline 141 of structure 140 to providing fresh air to support burning near

burner

200 and 300.

Structure 140 except top extensions coaxial with it, with vertical cylindrical sleeve 142 forms, is positioned under the burner 120 substantially.Sleeve 142 is the equipment of double-walled, has row's aperture at its inwall, and inwall is communicated with air duct 141 with inner space between the outer wall.Sleeve 142 plays the effect of a plurality of nozzle heads, to provide air round main burner 200 at its flame of mediad for 360 °.It also defines for the optimal spatial of burning in order to obtain sufficiently high temperature.

Flue 130 driven by electric blower 139 in case via directly under furnace top surface 111 horizontal channel that extend, that be arranged in shell 110 131 waste gas is transported, this horizontal channel from the combustion chamber side of 120 extend, upwards turn subsequently, and high outlet 132 places of the frame at shell 110 back sides stop.Basin 133 passes furnace top surface 111 parts and is installed in the passage 131, to be used for the regaining part heat of waste gas, in order to for example preserve in passing hot water.

Gas-cooker 100 comprises and is arranged on gas supply entrance 900 and main gas tube road 210 and the electromagnetic valve component 600 between the gas pipeline 310 of igniting, and controls to main gas tube road 210 and gas pipeline 310 supply gas that ignite being used for.Valve module 600 comprises: the first air valve 610, its be used for control to ignite gas pipeline 310 and according to the position of valve to main gas tube road 210 supply gas; And second air valve 620, it is used for control to main gas tube road 210 supply gas.Valve module 600 comprises: with the manual station of button 630 forms, it is used at first along with manual operation, namely presses, and opens the first air valve 610 and closes the second air valve 620, subsequently along with release, and opens the second air valve 620; And calutron or coil 640, it is used for keeping the first air valve 610 to open.Coil 640 is by drive circuit 641 excitations.Also have the flame ionization detector with vertical probe 700 forms, it has relevant flame ion testing circuit 701, is adjacent to fire guider 300 location with existing for detection of pilot flame.

Employing electronic control unit 800 is controlled the operation to the whole combustion system of gas-cooker 100.Except comprising AD/DC power circuit 810 with the electric power needs that satisfy all various elements, control module 800 especially also comprises, aforesaid drive circuit 641 and flame ion testing circuit 701.Gas-cooker 100 comprises main switch 11, and AC/DC power circuit 810 is connected to main power source 10 via this main switch by power cable.

Control module 800 is connected via flame ion testing circuit 701 and flame ion 700 circuit of popping one's head in, and be connected with solenoid 640 circuit via drive circuit 641, as long as detecting existing of pilot flame, flame ion probe 700 just make coil 640 keep the first air valve 610 to open to be used for.

Forward electromagnetic valve component 600 to, it has single housing 603, and it holds first and

second air valve

610 and 620 of the opposite side that is positioned at dividing plate 650.Dividing plate 650 is divided into first and

second chamber

601 and 602 that holds respectively first and

second air valve

610 and 620 fully across the inside extension of housing 603 and with this inside.Dividing plate 650 is formed with center port 653, has a little edge of projection at its opposite side, engages with the valve that is respectively applied to first and

second air valve

610 and 620.

The first air valve 610 comprises the armature 619 of the spring load with valve seat 611, and the valve seat elastic carrier is 653 adjacent side in the aperture, forms together normally close valve.Solenoid 640 is installed in armature 619 back; to be used for the situation lower magnetic force holding armature 619 in energising; and the valve seat 611 of therefore being correlated with is closed aperture 653; that is, as long as 700 appearance (and all error protection sensors all return " OK " signal under normal circumstances) that detect pilot flame of flame ion probe just keep air valve 610 to open.This air valve 610 is normally closed solenoid valve.

The second air valve 620 has the armature 629 with the spring load of valve seat 622, and its elastic biasing forms normally open valve together away from the respective side in aperture 653.This air valve 620 is for often opening manual operating valve.

Button 630 positioned coaxial are in the back of armature 629, to be used for, at first along with manual operation, namely in the situation of described embodiment for pressing, the aperture 653 that armature 629 is protruded into dividing plate 650 to be opening the first air valve 610, and subsequently, along with release, also open the second air valve 620.

Armature 629 pushes away the respective side in aperture 653 with the valve seat 611 of back, and opens the first air valve 610 by the effect of the spring 618 of opposing back.By so doing, the valve seat 622 that armature 629 is also pressed it is closed the second air valve 620 thus with opposite, the respective side in elastic resistance aperture 653.Along with release, armature 629 is recalled to allow to reopen the second air valve 620 under the effect of its spring 628.At this moment, the first air valve 610 will no longer be acted in order to stay open by armature 629, and opposite, as long as coil 640 is owing to 700 appearance that detect pilot flame of flame ion probe are energized, it is stayed open by solenoid 640.

Gas supply entrance 900 is connected to the first Room 601 of electromagnetic valve component 600, so that gas is introduced into valve module 600 herein, and the inflow of gas and pass dividing plate 650 and flow to relative chamber 602, by 610 controls of the first air valve.Main gas tube road 210 is connected to the second Room 602, arrives main burner 200 with the gas transfer for the aperture 653 that will pass dividing plate 650.Ignite gas pipeline 310 in dividing plate 650 by so that 653 gases that extract smaller portions pass to fire guider 300 from the aperture.

Usually, the gas of supplying passes dividing plate 650 and flows into the second Room 602 from the first Room 601.The first air valves 610 in the first Room 601 are configured to, and the ignite gas in gas pipeline 310 and main gas tube road 210 of the flow direction is controlled, and this is because this valve 610 is arranged on the upstream in ignite gas pipeline 310 and main gas tube road 210.620 pairs in the second air valve flows into the gas of the second air chamber 602 and controls so that via 210 discharges of main gas tube road, this is because this valve 620 is arranged on the upstream in main gas tube road 210, and is arranged on the downstream of the gas pipeline 310 that ignites.

Therefore be closed and cut off under the condition in main gas tube road 210 at the second air valve 620, the first air valve 610 is only controlled the ignite gas of gas pipeline 310 of the flow direction separately.When the button 630 of electromagnetic valve component 600 is pressed fully, produce this condition during initially the lighting of gas-cooker 100.

Gas-cooker 100 light by that fire guider 300 arranges with being adjacent to, for example realize for the spark generator of piezoelectric quartz type or ignitor 400.Ignitor 400 is operated by firing circuit 410, and this firing circuit is the part of electronic control unit 800.Under normal conditions, firing circuit 410 will trigger by first sensor (660), as long as the second sensor (550) detects specific condition, this just is allowed to.

First sensor (660) take to be installed in the housing 603 of electromagnetic valve component 600 or on the form of microswitch 660.Microswitch 660 is adjacent to the second air valve 620 and arranges and be configured to the position that test button 630 is pressed fully, therefore, switch 660 is closed to provide short-circuit signal to electronic control unit 800, perhaps particularly, provide short-circuit signal with the triggering signal as starting ignition circuit 410 via electronic control unit 800 to firing circuit 410.

At button 630 depressed position, the first air valve 610 is opened to allow that gas enters the dividing plate 650 in the valve module 600, and the second air valve 620 is closed to turn off the second Room 602 or main gas tube road 210, so that gas only supplies to the gas pipeline 310 that ignites via the inner passage in the dividing plate 650, and therefore supply to fire guider 300.So fire guider 300 is ready for igniting.

The second sensor (550) take to be installed in the manual main air valve 500 or on the form of another microswitch 550, manually the position of main air valve 500 between electromagnetic valve component 600 and main burner 200 is arranged in the main gas tube road 210.Main air valve 500 comprises for the control stick that rotates to open and close or control valve 500.Its major function is can manually control the speed of the gas that flows to main burner 200 along main gas tube road 210 to be used for the in use controllable adjustment of the combustion intensity of main burner 200.

Before igniting, main air valve 500 should be closed, so that cut off gas when main burner 200 does not burn.Prior, igniting or fire guider 300 lighted pilot flame is provided after, main burner 200 should be lighted by the pilot flame that comes from low gas velocity when main air valve 500 is opened.In the situation that main air valve 500 is not closed, opened especially fully at first, button 630 releases (causing reopening of the second air valve 620) along with electromagnetic valve component 600, in case fire guider 300 is lighted, flowing suddenly of gas will be broken through the main air valve 500 arrival main burners 200 of opening, cause thus lighting suddenly of main burner 200, and this may be dangerous or not expect at least.

Microswitch 550 is adjacent to main air valve 500 and arranges and be provided in the closing position that detects main air valve under the aforesaid actual conditions, when it is closed, short-circuit signal is provided or provides short-circuit signal via electronic control unit 800 to firing circuit 410 particularly to electronic control unit 800, with the enable signal that only when main air valve 500 is closed, operates as permission firing circuit 410.

Usually, when the second sensor 550 detects main air valve 500 and is closed, first sensor 660 detects pressing fully of button 630 and makes firing circuit 410 work, and the spark of fire guider is lighted in its subsequently ignitor 400 energisings with near generation fire guider 300.

In slightly different embodiment, microswitch 550 and/or 660 can be connected to power circuit 810, rather than flow directly to firing circuit 410, to such an extent as to operate whole electronic control unit 800 by starting power supply, allow or the work of trigger point ignition circuit 410, and allow conversely or trigger ignitor 400.This setting is used to the operation that the operational flowchart of Fig. 6 is explained.

Forward flame ion probe 700 to, it flame detection be effectively and its response very fast.It detects the intermediate ion that is produced by flame during hydrocarbon combustion.Probe 700 can be configured to fully near main burner 200, in order to detect the appearance of main flame, has reached effect identical when detecting pilot flame with its.

In the normal operating of gas-cooker 100, when main flame can be closed or also not open, pilot flame will keep.Extinguished by accident at pilot flame, and fire guider is not when occurring at main flame not rekindling in the situation of (it is extinguished or does not open at all), flame ion probe 700 at once (greatly in one second) stops its output signal, in order to make immediately electronic control unit 800 inactive drive circuits 641 and the solenoid 640 of stopping using conversely.Because coil 640 has discharged relevant armature 619, this cuts off to main burner 200 and fire guider 300 supply gas thus so that close immediately the first air valve 610.

The flame ion detection system, namely flame ion probe 700 and as the correlation detecting circuit 701 of the part of electronic control unit 800 has substituted thermocouple wire and igniter that known response speed reaches 60 seconds flame failure detection system approximately.These new elements have been imitated the output that is replaced parts effectively, but utilize quickish flame detection speed or be about 1 second work break time.

Flame ion probe 700 the simplest forms be can the sensing combustion ion electric lead, it picks up combustion ion and they is transmitted to the testing circuit 701 (or common control module 800) of its back from air.In order in the existing gas-cooker that uses the thermocouple probe flame detection to lose efficacy, to implement, can convenient employing pop one's head in 700 with the conductor that is connected thermocouple probe to be used as flame ion.In this regard, the cost of modification is little.

According to above-mentioned operation and function, electronic control unit 800 can be counted as comprising: start control circuit 801 (referring to Fig. 5), in order to prepare for lighting a fire and lighted a fire by ignitor 400 generations; With holding circuit 802 (also referring to Fig. 5), in order to occur keeping the first valve 610 to open with regard to electromagnetic ground as long as flame ion probe 700 detects flame.

Electronic control unit 800 is provided for implementing the additional port of additional function and safety measure, such as, microswitch 660 is connected to one of them port to be used for triggering igniting, microswitch 550 is connected to another port in order to guarantee the soft start of main burner 200, and pressure switch 138 is installed in the exit of hair-dryer 139 and is connected to another port to be used for being cut to the power supply of electronic control unit 800 to close the gas supply under the situation that hair-dryer 139 lost efficacy again.Gas supply or to flow be possible when gas appliance 100 is correctly worked under normal circumstances only.These switches 660,550 and 138 are the example (mentioned in the operational flowchart such as Fig. 6) of error protection sensor.

Air valve

610 and 620 in the electromagnetic valve component 600, magnetic valve 610 is compared with the more expensive option such as solenoid valve especially (to comprise solenoid 640), and cost is lower and compacter.Solenoid valve is usually more expensive and larger, and this is because they need sizable magnetic force come mobile armature, therefore needs stronger/larger magnet and coil etc., and only needs magnetic valve to keep the armature that has been moved by hand.

The present invention only provides by way of example, to the various changes of described embodiment and/or revise and can be realized and do not broken away from scope of the present invention specified in appended claims by those skilled in the art.For example, gas appliance can be water heater.

Claims

1. gas appliance, it comprises:

The combustion zone;

The fire guider that keeps pilot flame in the combustion zone;

Light gas in the combustion zone to produce the main burner of heat;

Be the gas supply entrance of fire guider and main burner supply gas via separately first and second gas passage;

Electromagnetic valve component, it is arranged between gas supply entrance and first and second gas passage, to be used for control to first and second gas passage supply gas;

Electromagnetic valve component have for control to the first valve of at least the first gas passage supply gas, be used for control to the second valve of the second gas passage supply gas, be used at first opening the first valve along with manual operation and open subsequently the manual station of second valve along with release and be used for the calutron that keeps the first valve to open;

Be adjacent to the flame ionization detector of fire guider setting to exist for detection of pilot flame; And

Electronic control unit with flame ionization detector is connected with the calutron circuit detects existing of pilot flame to be used for needing only flame ionization detector, just makes calutron keep the first valve to open.

2. gas appliance as claimed in claim 1, wherein, upwards open the combustion zone, and cooking appliance will be placed in the above to be used for heat food.

3. gas appliance as claimed in claim 1, wherein, manual station is configured at first open the first valve and close second valve along with manual operation, and reopens second valve along with release subsequently, and the first valve is stayed open by calutron simultaneously.

4. gas appliance as claimed in claim 1, wherein, the first valve comprises normally closed solenoid valve.

5. gas appliance as claimed in claim 1, wherein, second valve comprises often opens manual operating valve.

6. such as each described gas appliance among the aforementioned claim 1-5, wherein, the first valve is arranged on the upstream of first and second gas passage, and can operate the gas that flows to first and second gas passage for cut-out.

7. gas appliance as claimed in claim 6, wherein, second valve is arranged on the upstream of the second gas passage, the downstream of the first gas passage, and can operate the gas that flows to the second gas passage for cut-out.

8. gas appliance as claimed in claim 1, wherein, electromagnetic valve component has single housing, and it holds first and second valve simultaneously.

9. each described gas appliance as among the aforementioned claim 1-5, wherein, electromagnetic valve component comprises sensor, and it is used for opening of sensing the first valve, and is used for along with the opening of the first valve that senses, and the operation of pilot spark generator is to light fire guider.

10. gas appliance as claimed in claim 9, wherein, this sensor is configured to opening of with reference to the operating position of manual station sensing the first valve.

11. gas appliance as claimed in claim 9, wherein, spark generator is connected to electronic control unit being used for by its operation, and this sensor is connected to electronic control unit, to be used for the operation via electronic control unit pilot spark generator.

12. gas appliance as claimed in claim 9, it comprises manual main air valve, and it is arranged on the second gas passage between electromagnetic valve component and the main burner, the gas that flows to main burner along the second gas passage is controlled being used for.

13. gas appliance as claimed in claim 12, wherein, manually main air valve comprises sensor, and it is used for the closing position of the manual main air valve of sensing, and as the operation of response with the permission spark generator.

14. gas appliance as claimed in claim 13, wherein, this sensor is connected to electronic control unit, to be used for allowing via electronic control unit the operation of spark generator.

15. gas appliance as claimed in claim 14, wherein, this sensor is connected to electronic control unit, to be used for operating electronic control unit by opening power supply, allows the operation of spark generator via electronic control unit.

16. as each described gas appliance among the aforementioned claim 1-5, it comprises manual main air valve, it is arranged on the second gas passage between calutron assembly and the main burner, flows to the gas of main burner along the second gas passage to be used for manual adjustments.