CN103727676A - Gas water heater - Google Patents
Gas water heater Download PDFInfo
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- CN103727676A CN103727676A CN201310637776.XA CN201310637776A CN103727676A CN 103727676 A CN103727676 A CN 103727676A CN 201310637776 A CN201310637776 A CN 201310637776A CN 103727676 A CN103727676 A CN 103727676A
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Abstract
The invention discloses a gas water heater. The gas water heater comprises a combustor, a gas pipe, a flue gas discharging pipe, a fan assembly and an air pressure protection control circuit, wherein the air pressure protection control circuit comprises a control mainboard, an air pressure detection unit and a gas proportional valve arranged on the gas pipe, the control mainboard is electrically connected with the air pressure detection unit, the gas proportional valve and the fan assembly, and the air pressure detection unit is used for detecting the pressure of air in the flue gas discharging pipe. Due to the facts that measured air pressure values are converted into voltage signals which are continuously output, and the voltage signals are transmitted to the control mainboard, control over the gas proportional valve, a water proportional valve and the fan assembly can be achieved, the working state of the gas water heater is adjusted according to the current air pressure value, the gas water heater can adapt to changes of the environment, combustion performance of the gas water heater is ensured, the using performance of the gas water heater is improved, and the requirements for safety, environmental friendliness and practicability are met. The invention further discloses a gas water heater. The gas water heater adapts to changes of the environment through control over the flue gas discharging power of the fan assembly.
Description
Technical field
The present invention relates to gas utensil technical field, especially relate to a kind of forced-ventilated gas water heater with blast protective device.
Background technology
Popularization and application along with gas heater, to daily life, brought very big facility, burning security incident insufficient or that gas leakage causes due to combustion gas occurs repeatedly simultaneously, therefore country's mandatory provision in the standard of gas heater, must be equipped with Forced discharge fan, the waste gas that Forced discharge fan pump drainage burning simultaneously produces when gas heater starts.Yet when using gas heater, if extraneous blast is excessive, the gas heater resistance of discharging fume in use increases so, the smoke exhaust efficiency step-down of Forced discharge fan, thus it is insufficient to make to burn, and waste gas exceeds standard,, there is potential safety hazard in water temperature step-down, user healthy caused to very big harm.
At present; forced-ventilated gas water heater mostly adopts following scheme to solve and because extraneous blast is excessive, causes insufficient the caused problem of burning: adopt blast switch as the protection mechanism of gas heater; when the wind pressure value of sample point reaches the default working value of blast switch; blast switch disconnects, and gas heater is quit work.Yet, for this solution, sensitivity and the stability of blast switch is depended in the security of gas heater, after the long-time use of blast switch, there will be the inaccurate phenomenon of switch motion, and when blast reaches certain value, gas heater quits work, and has dwindled the scope of application of gas heater, is difficult to meet instructions for use.
Summary of the invention
Main purpose of the present invention is to provide a kind of gas heater, is intended to realize the protection of intelligent blast, overcomes the impact of environmental factor, improves its use ability, reaches safety, environmental protection, applicable requirement.
To achieve these objectives, the present invention proposes a kind of gas heater, comprise burner, the Gas Pipe being communicated with described burner, be placed in smoke exhaust pipe and the blower fan assembly of described burner top, in addition, this gas heater also comprises blast protection control circuit, described blast protection control circuit comprises control mainboard, blast detecting unit and be arranged on the gas ratio valve in described Gas Pipe, described control mainboard respectively with described blast detecting unit, gas ratio valve and described blower fan assembly are electrically connected to, described blast detecting unit is for detection of the blast in described smoke exhaust pipe, wherein: described control mainboard is when described blast detecting unit detects blast in described smoke exhaust pipe and is greater than default wind pressure value, reduce the input current of described gas ratio valve, to reduce the aperture of described gas ratio valve.
Preferably, described blast detecting unit is differential transmitter, and described differential transmitter is provided with the first detection mouth and second and detects mouth, is provided with wind pressure sampling mouth on described smoke exhaust pipe, described first detects mouth is communicated with described wind pressure sampling mouth, and described second detects mouth opens wide and be placed in air.
Preferably, this gas heater also comprises the water inlet pipe with water proportioning valve, described control mainboard is electrically connected to described water proportioning valve, wherein: described control mainboard is when described blast detecting unit detects blast in described smoke exhaust pipe and is greater than default wind pressure value, reduce the input current of described water proportioning valve, to reduce the aperture of described water proportioning valve.
Preferably, described blower fan assembly is placed in the below of described burner, and the fume exhausting type of described gas heater is forced-air blast; Or described blower fan assembly is placed in the top of described burner, the fume exhausting type of described gas heater is forced draft.
Preferably, the motor of described blower fan assembly is alternating current generator or direct current generator.
Preferably; described blast protection control circuit also comprises warning unit; described control mainboard is electrically connected to described warning unit; wherein: described control mainboard, when described blast detecting unit detects blast in described smoke exhaust pipe and is greater than default wind pressure value, is controlled described warning unit and sent gas heater and be not suitable for the normal information of using.
The present invention also proposes a kind of gas heater, comprise burner, the Gas Pipe being communicated with described burner, be placed in smoke exhaust pipe and the blower fan assembly of described burner top, in addition, this gas heater also comprises blast protection control circuit, described blast protection control circuit comprises controls mainboard and blast detecting unit, the motor of described blower fan assembly is direct current generator, described control mainboard is electrically connected to described blast detecting unit and described blower fan assembly respectively, described blast detecting unit is for detection of the blast in described smoke exhaust pipe, wherein: described control mainboard is when described blast detecting unit detects blast in described smoke exhaust pipe and is greater than default wind pressure value, improve the input voltage of described blower fan assembly, to improve the smoke evacuation power of described blower fan assembly.
Preferably, described blast detecting unit is differential transmitter, described differential transmitter is provided with the first detection mouth and second and detects mouth, on described smoke exhaust pipe, be provided with wind pressure sampling mouth, described first detects mouth is communicated with described wind pressure sampling mouth, and described second detects mouth opens wide and be placed in air.
Preferably; described blast protection control circuit also comprises the gas ratio valve being arranged in described Gas Pipe; described control mainboard is electrically connected to described gas ratio valve; wherein: described control mainboard is when described blast detecting unit detects blast in described smoke exhaust pipe and is greater than default wind pressure value; reduce the input current of described gas ratio valve, to reduce the aperture of described gas ratio valve.
Preferably, this gas heater also comprises the water inlet pipe with water proportioning valve, described control mainboard is electrically connected to described water proportioning valve, wherein: described control mainboard is when described blast detecting unit detects blast in described smoke exhaust pipe and is greater than default wind pressure value, reduce the input current of described water proportioning valve, to reduce the aperture of described water proportioning valve.
Preferably, described blower fan assembly is placed in the below of described burner, and the fume exhausting type of described gas heater is forced-air blast; Or described blower fan assembly is placed in the top of described burner, the fume exhausting type of described gas heater is forced draft.
Preferably, this gas heater also comprises warning unit, described control mainboard is electrically connected to described warning unit, wherein: described control mainboard, when described blast detecting unit detects blast in described smoke exhaust pipe and is greater than default wind pressure value, is controlled described warning unit and sent gas heater and be not suitable for the normal information of using.
A kind of gas heater provided by the present invention, utilize blast detecting unit to detect in real time the size of blast in smoke exhaust pipe, by the wind pressure value recording being converted to the voltage signal of continuous wave output and sending control mainboard to, between the wind pressure value that blast detecting unit detects and the voltage signal of its output, there is good linear relationship, through controlling the computing of mainboard, control instruction is sent to blast protection control circuit, realization is to gas ratio valve, the control of water proportioning valve and blower fan assembly, according to the duty of the real-time regulating gas water heater of current wind pressure value, the variation that gas heater is conformed, guarantee the combustibility of gas heater, improve the use ability of gas heater, reach safety, environmental protection, applicable requirement.
Accompanying drawing explanation
Fig. 1 is the structural representation of gas heater one embodiment of the present invention;
Fig. 2 is the structural representation of another embodiment of gas heater of the present invention;
Fig. 3 is that gas heater of the present invention is with the structural representation of water route regulating system;
Fig. 4 is the wind pressure value of smoke exhaust pipe of gas heater of the present invention and the function relation figure of the output voltage of differential transmitter.
The realization of the object of the invention, functional characteristics and advantage, in connection with embodiment, are described further with reference to accompanying drawing.
The specific embodiment
Should be appreciated that specific embodiment described herein, only in order to explain the present invention, is not intended to limit the present invention.
Referring to Fig. 1 and Fig. 2, Fig. 1 is the structural representation of gas heater one embodiment of the present invention; Fig. 2 is the structural representation of another embodiment of gas heater of the present invention.
The gas heater that this enforcement provides, comprise burner 10, Gas Pipe 11, heat exchanger 13, exhaust fume collecting hood 14, smoke exhaust pipe 15, blower fan assembly 16, burner 10 is placed in the below of heat exchanger 13, exhaust fume collecting hood 14 is placed in the top of heat exchanger 13, Gas Pipe 11 is communicated with burner 10 and provides fuel gas for burner 10, smoke exhaust pipe 15 and exhaust fume collecting hood 14 are communicated with and are placed in the top of exhaust fume collecting hood 14, with by outside the flue gas discharge chamber of exhaust fume collecting hood 14 interior collections, blower fan assembly 16 is arranged in gas heater, the flue gas being produced that burns when by gas water heater working is forced to discharge from smoke exhaust pipe 15.When using gas heater, if meet atrocious weather, such as extraneous blast is excessive, the gas heater resistance of discharging fume in use increases so, the smoke exhaust efficiency meeting step-down of blower fan assembly 16, in the situation that the combustion gas of metered flow being provided to burner 10, because the air output of blower fan assembly 16 reduces, thereby it is insufficient to make to burn, waste gas exceeds standard,, there is potential safety hazard in water temperature step-down, user healthy caused to very big harm.
For fear of the problem that causes gas heater normally to use because of environmental factor; the gas heater of the present embodiment also comprises blast protection control circuit; this blast protection control circuit comprises to be controlled mainboard 17, blast detecting unit and is arranged on the gas ratio valve 12 in Gas Pipe 11; blast detecting unit is for detecting in real time the blast size in smoke exhaust pipe 15; and convert the wind pressure value recording to voltage signal; and the wind pressure value recording and the voltage signal of output have good linear relationship, simplified processing and the control principle of later data.Controlling mainboard 17 is electrically connected to blast detecting unit, gas ratio valve 12 and blower fan assembly 16 respectively, control mainboard 17 by controlling input current size control to gas ratio valve 12 apertures with realization of gas ratio valve 12, thereby reduce or improve the thermic load of burner 10, make gas heater adapt to the variation of external environment.
Particularly, the blast detecting unit of the present embodiment is preferably differential transmitter 18, this differential transmitter 18 is provided with the first detection mouth 181 and second and detects mouth 182, ad-hoc location on smoke exhaust pipe 15 (for example, smoke outlet near exhaust fume collecting hood 14) be provided with wind pressure sampling mouth A, first of differential transmitter 18 detects mouth 181 and for example, is communicated with wind pressure sampling mouth A by a pipeline (, plastic flexible pipe or copper pipe), and second detects mouth 182 opens wide and be placed in air.Be understandable that, to one skilled in the art, blast detecting unit can also be other any suitable pressure sensors, and the pressure measurement probe of pressure sensor is placed in the wind pressure sampling mouth A of smoke exhaust pipe 15, to realize, the blast in smoke exhaust pipe 15 is detected, therefore not to repeat here.
When using gas heater, differential transmitter 18 detects the wind pressure value at the wind pressure sampling mouth A place of smoke exhaust pipe 15 in real time, and convert the wind pressure value recording to voltage signal output, blast as shown in Figure 4 and output voltage curve map are known, the wind pressure value that differential transmitter 18 records and the voltage signal of its output are linear, and input blast is directly proportional to output voltage, therefore do not need the wind pressure data to gathering to carry out complex calculations, control principle is simple, with low cost.
For example weather conditions variation, extraneous blast becomes large, the gas heater resistance of discharging fume in use increases, the air feed efficiency step-down of blower fan assembly 16, thereby make the burning of burner 10 insufficient, the flue gas that is rich in CO is difficult to discharge, contaminated environment not only, and user healthy caused to very big injury.The blast detecting in smoke exhaust pipe 15 when differential transmitter 18 (is for example greater than default wind pressure value, in the time of 40Pa), guaranteeing that gas heater has under the prerequisite of good combustion performance, improve the use ability of gas heater, control the input current that mainboard 17 reduces gas ratio valve 12, so that the aperture of gas ratio valve 12 reduces, thereby reduce the thermic load of burner 10.As shown in table 1 below, according to the detection data of differential transmitter 18, carry out the aperture of regulating gas proportioning valve 12, guaranteed within the specific limits the combustion efficiency of burner 10, make the CO content in flue gas reach safety standard.
Table 1:
It is worth mentioning that the wind pressure value detecting according to differential transmitter 18 can carry out continuous control to the aperture of gas ratio valve 12, so that burner 10 keeps good combustibility, for example during blast step-down, improve the aperture of gas ratio valve 12, make burner 10 reach new equalization point.In addition; under extreme case; for example blast is excessive; can not be by regulating the thermic load of burner 10 to meet normal combustion requirement; or in the time of cannot meeting instructions for use after the load of reduction burner 10; control mainboard 17 control blast protection control circuits and close gas ratio valve 12, and close gas heater and carry out blowout protection.Therefore, gas heater of the present invention can regulate the duty of self in real time according to current wind pressure value, and the variation conforming, guarantees good combustibility, has improved the use ability of gas heater, reaches safety, environmental protection, applicable requirement.
It is emphasized that, to one skilled in the art, explanation with reference to the present embodiment, can realize easily and on dual-purpose stove (domestic gas wall-hanging heating/hot water two purpose stove), be provided with differential transmitter based on invention thought of the present invention, improve the ability that dual-purpose stove is resisted extraneous blast, the variation conforming, the combustibility of assurance dual-purpose stove, reach safety, environmental protection, applicable requirement, therefore not to repeat here.
Referring to Fig. 3, Fig. 3 is that gas heater of the present invention is with the structural representation of water route regulating system.
Further, in order to meet the demand of constant temperature water supply, improve the applicable ability of gas heater, in the present embodiment, this gas heater also comprises the water inlet pipe 19 with water proportioning valve 20, control mainboard 17 and be electrically connected to water proportioning valve 20, therefore can be by controlling the aperture of water proportioning valve 20 with the inflow of control gas heater.As described in above-described embodiment, when differential transmitter 18 detects blast in smoke exhaust pipe 15, be greater than default wind pressure value and (for example,, in the time of 40Pa), control the input current that mainboard 17 reduces gas ratio valve 12, so that the aperture of gas ratio valve 12 reduces, thereby reduce the thermic load of burner 10.Yet, reducing after the thermic load of burner 10, gas heater possibly cannot meet user's instructions for use in some cases, for example, when temperature is lower, while needing the higher hot water of temperature, in this case, can solve by regulating gas water heater water yield per minute.When differential transmitter 18 detects blast in smoke exhaust pipe 15 and is greater than default wind pressure value, control the input current that mainboard 17 reduces water proportioning valve 20, to reduce the discharge of water inlet pipe 19, thereby make after reducing the thermic load of burner 10, the hot water of gas heater output reaches user's instructions for use.
In the present embodiment, blower fan assembly 16 can be arranged on the ad-hoc location of gas heater according to actual needs, as shown in Figure 1, blower fan assembly 16 is placed in the below of burner 10, when gas water heater working, blower fan assembly 16 starts, and from the below of burner 10, burner 10 is carried out to air blast, and the fume exhausting type of gas heater is forced-air blast.Or, as shown in Figure 2, blower fan assembly 16 is placed in the top of heat exchanger 13, specifically be positioned at the smoke outlet of exhaust fume collecting hood 14, when gas water heater working, blower fan assembly 16 starts, and from the top of heat exchanger 13, burner 10 is carried out to exhausting, make burner 10 in negative pressure region, the fume exhausting type of gas heater is forced draft.In addition, the motor rotating for drives impeller in blower fan assembly 16 can not be restricted this for alternating current generator or direct current generator, and for cost-saving, the motor of the present embodiment is preferably alternating current generator.
In addition, this blast protection control circuit also comprises warning unit (not shown), controlling mainboard 17 is electrically connected to warning unit, this warning unit is for sending the working environment of current gas heater to user, wherein, when differential transmitter 18 detects blast in smoke exhaust pipe 15 and is greater than default wind pressure value, control mainboard 17 control warning unit and send the information that gas heater is not suitable for normal use, the blast particularly detecting in smoke exhaust pipe 15 when differential transmitter 18 is excessive, so that gas heater is when cannot normally use, control mainboard 17 control gas heaters and carry out blowout protection, reminding user is rationally used gas heater, avoid occurring security incident.
Particularly, warning unit can be man-machine interface, voice module or indicating lamp module etc., when differential transmitter 18 detects blast in smoke exhaust pipe 15 and is greater than default wind pressure value, control mainboard 17 and send information to warning unit, this information can be Word message, image information, voice messaging or light information etc., for example voice module sounds the alarm with reminder alarm user after receiving voice messaging, or indicating lamp module receive information after flashing with reminder alarm user.By be provided with warning unit on gas heater, can allow user know more intuitively the working condition that gas heater is current, improve the safety in utilization of gas heater.
The present invention also proposes a kind of gas heater.
The gas heater that the present embodiment provides; comprise burner, Gas Pipe, heat exchanger, exhaust fume collecting hood, smoke exhaust pipe and blower fan assembly; in addition; this gas heater also comprises blast protection control circuit; this blast protection control circuit comprises controls mainboard and blast detecting unit; the motor of blower fan assembly is direct current generator, controls mainboard and is electrically connected to blast detecting unit and blower fan assembly respectively, and blast detecting unit is for detection of the blast in smoke exhaust pipe.Different from above-described embodiment, the blower fan assembly of the gas heater of the present embodiment adopts direct current generator, can carry out speed governing by adjusting its operating voltage, and control principle is simple.Wherein, when blast detecting unit detects blast in smoke exhaust pipe and is greater than default wind pressure value, control the input voltage that mainboard improves blower fan assembly, to improve the smoke evacuation power of blower fan assembly.As can be seen here, in the present embodiment, when extraneous blast is larger, by improving the smoke evacuation power of blower fan assembly, eliminate smoke evacuation resistance, guarantee the combustibility of burner, thereby improved the use ability of gas heater, reach safety, environmental protection, applicable requirement.It should be noted that, above-described embodiment elaborates to the operation principle of the main parts size of gas heater and blast detecting unit, and and therefore not to repeat here.
It is emphasized that, to one skilled in the art, explanation with reference to the present embodiment, can realize easily and on dual-purpose stove (domestic gas wall-hanging heating/hot water two purpose stove), be provided with differential transmitter based on invention thought of the present invention, improve the ability that dual-purpose stove is resisted extraneous blast, the variation conforming, the combustibility of assurance dual-purpose stove, reach safety, environmental protection, applicable requirement, therefore not to repeat here.
Particularly, the blast detecting unit of the present embodiment is preferably differential transmitter, this differential transmitter is provided with the first detection mouth and second and detects mouth, ad-hoc location on smoke exhaust pipe (for example, smoke outlet near exhaust fume collecting hood) be provided with wind pressure sampling mouth, first of differential transmitter detects mouth and for example, is communicated with wind pressure sampling mouth by a pipeline (, plastic flexible pipe or copper pipe), and second detects mouth opens wide and be placed in air.Be understandable that, to one skilled in the art, blast detecting unit can also be other any suitable pressure sensors, and the pressure measurement probe of pressure sensor is placed in the wind pressure sampling mouth of smoke exhaust pipe, to realize, the blast in smoke exhaust pipe is detected, therefore not to repeat here.
Further; for fear of because of extraneous blast excessive; the problem that also cannot reach normal combustion operating mode by adjusting the smoke evacuation power of blower fan assembly occurs; this blast protection control circuit also comprises the gas ratio valve being arranged in Gas Pipe; controlling mainboard is electrically connected to gas ratio valve; by controlling input current size control to gas proportion valve opening with realization of gas ratio valve, thereby reduce or improve the thermic load of burner, make gas heater meet instructions for use.Wherein, when differential transmitters sense is greater than default wind pressure value to the blast in smoke exhaust pipe, control mainboard by reducing the input current of gas ratio valve, to reduce the thermic load of burner, make burner reach new equalization point, further improved gas heater and adapted to the ability that external environment changes.
Further, in order to meet the demand of constant temperature water supply, improve the applicable ability of gas heater, this gas heater also comprises the water inlet pipe with water proportioning valve, control mainboard and be electrically connected to water proportioning valve, therefore can be by controlling the aperture of water proportioning valve with the inflow of control gas heater.As described in above-described embodiment, when differential transmitters sense is greater than default wind pressure value to the blast in smoke exhaust pipe, control mainboard by reducing the input current of gas ratio valve, so that the aperture of gas ratio valve reduces, thereby reduce the thermic load of burner, simultaneously, control mainboard by reducing the input current of water proportioning valve, to reduce the discharge of water inlet pipe, in the situation that temperature is lower, guaranteed that the hot water of gas heater output meets instructions for use.
In the present embodiment, for the arrangement of blower fan assembly, can be arranged on according to actual needs the ad-hoc location of gas heater.For example, blower fan assembly is placed in the below of burner, and the fume exhausting type of gas heater is forced-air blast.Or blower fan assembly is placed in the top of heat exchanger, the fume exhausting type of gas heater is forced draft.The specific embodiment can be with reference to the blower fan assembly 16 shown in Fig. 1 in above-described embodiment and Fig. 2, and and therefore not to repeat here.
It is worth mentioning that, same as the previously described embodiments, the gas heater of the present embodiment also comprises warning unit, controls mainboard and is electrically connected to warning unit.Wherein, control mainboard when differential transmitters sense is greater than default wind pressure value to the blast in smoke exhaust pipe, control warning unit sends gas heater and is not suitable for the normal information of using.The specific embodiment of warning unit can be with reference to the explanation of above-described embodiment, and for example, warning unit can be man-machine interface, voice module or indicating lamp module etc., and therefore not to repeat here.
Should be understood that; these are only the preferred embodiments of the present invention; can not therefore limit the scope of the claims of the present invention; every equivalent structure or conversion of equivalent flow process that utilizes description of the present invention and accompanying drawing content to do; or be directly or indirectly used in other relevant technical fields, be all in like manner included in scope of patent protection of the present invention.
Claims (12)
1. a gas heater; comprise burner, the Gas Pipe being communicated with described burner, be placed in smoke exhaust pipe and the blower fan assembly of described burner top; it is characterized in that: this gas heater also comprises blast protection control circuit; described blast protection control circuit comprises to be controlled mainboard, blast detecting unit and is arranged on the gas ratio valve in described Gas Pipe; described control mainboard is electrically connected to described blast detecting unit, gas ratio valve and described blower fan assembly respectively; described blast detecting unit is for detection of the blast in described smoke exhaust pipe, wherein:
Described control mainboard, when described blast detecting unit detects blast in described smoke exhaust pipe and is greater than default wind pressure value, reduces the input current of described gas ratio valve, to reduce the aperture of described gas ratio valve.
2. gas heater according to claim 1, it is characterized in that: described blast detecting unit is differential transmitter, described differential transmitter is provided with the first detection mouth and second and detects mouth, on described smoke exhaust pipe, be provided with wind pressure sampling mouth, described first detects mouth is communicated with described wind pressure sampling mouth, and described second detects mouth opens wide and be placed in air.
3. gas heater according to claim 1, is characterized in that: this gas heater also comprises the water inlet pipe with water proportioning valve, and described control mainboard is electrically connected to described water proportioning valve, wherein:
Described control mainboard, when described blast detecting unit detects blast in described smoke exhaust pipe and is greater than default wind pressure value, reduces the input current of described water proportioning valve, to reduce the aperture of described water proportioning valve.
4. according to the gas heater described in claim 1,2 or 3, it is characterized in that: described blower fan assembly is placed in the below of described burner, the fume exhausting type of described gas heater is forced-air blast; Or described blower fan assembly is placed in the top of described burner, the fume exhausting type of described gas heater is forced draft.
5. according to the gas heater described in claim 1,2 or 3, it is characterized in that: the motor of described blower fan assembly is alternating current generator or direct current generator.
6. according to the gas heater described in claim 1,2 or 3, it is characterized in that: described blast protection control circuit also comprises warning unit, and described control mainboard is electrically connected to described warning unit, wherein:
Described control mainboard, when described blast detecting unit detects blast in described smoke exhaust pipe and is greater than default wind pressure value, is controlled described warning unit and is sent gas heater and be not suitable for the normal information of using.
7. a gas heater; comprise burner, the Gas Pipe being communicated with described burner, be placed in smoke exhaust pipe and the blower fan assembly of described burner top; it is characterized in that: this gas heater also comprises blast protection control circuit; described blast protection control circuit comprises controls mainboard and blast detecting unit; the motor of described blower fan assembly is direct current generator; described control mainboard is electrically connected to described blast detecting unit and described blower fan assembly respectively; described blast detecting unit is for detection of the blast in described smoke exhaust pipe, wherein:
Described control mainboard, when described blast detecting unit detects blast in described smoke exhaust pipe and is greater than default wind pressure value, improves the input voltage of described blower fan assembly, to improve the smoke evacuation power of described blower fan assembly.
8. gas heater according to claim 7, it is characterized in that: described blast detecting unit is differential transmitter, described differential transmitter is provided with the first detection mouth and second and detects mouth, on described smoke exhaust pipe, be provided with wind pressure sampling mouth, described first detects mouth is communicated with described wind pressure sampling mouth, and described second detects mouth opens wide and be placed in air.
9. gas heater according to claim 7, is characterized in that: described blast protection control circuit also comprises the gas ratio valve being arranged in described Gas Pipe, and described control mainboard is electrically connected to described gas ratio valve, wherein:
Described control mainboard, when described blast detecting unit detects blast in described smoke exhaust pipe and is greater than default wind pressure value, reduces the input current of described gas ratio valve, to reduce the aperture of described gas ratio valve.
10. gas heater according to claim 9, is characterized in that: this gas heater also comprises the water inlet pipe with water proportioning valve, and described control mainboard is electrically connected to described water proportioning valve, wherein:
Described control mainboard, when described blast detecting unit detects blast in described smoke exhaust pipe and is greater than default wind pressure value, reduces the input current of described water proportioning valve, to reduce the aperture of described water proportioning valve.
11. according to the gas heater described in any one in claim 7 to 10, it is characterized in that: described blower fan assembly is placed in the below of described burner, and the fume exhausting type of described gas heater is forced-air blast; Or described blower fan assembly is placed in the top of described burner, the fume exhausting type of described gas heater is forced draft.
12. according to the gas heater described in any one in claim 7 to 10, it is characterized in that: this gas heater also comprises warning unit, described control mainboard is electrically connected to described warning unit, wherein: described control mainboard, when described blast detecting unit detects blast in described smoke exhaust pipe and is greater than default wind pressure value, is controlled described warning unit and sent gas heater and be not suitable for the normal information of using.
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