CN210088816U - Gas boiler - Google Patents

Abstract

The utility model relates to a gas boiler, include: the device comprises a combustion chamber, a controller, a heat exchanger, a burner, an air inlet pipe, a gas proportional valve, a zirconia oxygen sensor and a signal amplification circuit module, wherein detection probes of the heat exchanger, the burner and the zirconia oxygen sensor are all accommodated in the combustion chamber, and the air inlet pipe, the gas proportional valve and the burner are sequentially connected through a pipeline; the zirconia oxygen sensor passes through signal amplification circuit module and controller electric connection, gas proportional valve and controller electric connection. The utility model discloses an add signal amplification circuit module between zirconia oxygen sensor and controller, amplify the potential signal of zirconia oxygen sensor output, improve the ability that the signal resists the line loss, the controller just can accurate detection electric potential size, improves the accuracy that detects oxygen content size in the flue gas to accurate feedback just can be made to oxygen content's size in the flue gas to the controller.

Description

Gas boiler

Technical Field

The utility model relates to a middle-size and small-size boiler technical field especially relates to a gas boiler.

Background

In the existing application technology, the automatic air-fuel ratio adjustment technology of the gas boiler detects the state information of flame through an ion probe and transmits the information to a controller, and the controller controls the size of a gas valve according to feedback information to control the air-fuel ratio within a proper range, so that the system can be in the optimal working state under the conditions of different gas types, climates and air pressures. However, the quality of domestic gas and air is poor, carbon is easily deposited on the surface of the ion probe during combustion, and the accuracy of flame detection information is affected, so that the automatic air-fuel ratio adjusting technology adopting the ion probe for detection is suitable for factory production adjustment and initial installation of users, and is not suitable for long-term control.

Therefore, the oxygen content in the flue gas is detected by the oxygen sensor in the existing gas boiler on the market, the oxygen content information is transmitted to the controller, and the controller controls the opening size of the gas valve according to the oxygen content information fed back by the oxygen sensor, so that the mixing ratio of the gas and the air can be accurately adjusted, and the combustor can be kept in the optimal working state. However, most of oxygen sensors for detecting the content of the flue gas are zirconia sensors, the working output potential of the zirconia oxygen sensors is generally lower than 1V, partial potential can be lost after transmission through a line, if the line is too long, the residual potential consumed by the line is too low, a controller cannot accurately detect the potential value, the measurement accuracy of the content of the oxygen in the flue gas is reduced, and therefore accurate feedback of the content of the oxygen in the flue gas cannot be made.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to overcome prior art's not enough, provide a gas boiler, its accuracy that can improve the oxygen content size detection in the flue gas.

In order to achieve the above object, the present invention provides a gas boiler, comprising: the device comprises a combustion chamber, a controller, a heat exchanger, a burner, an air inlet pipe, a gas proportional valve, a zirconia oxygen sensor and a signal amplification circuit module, wherein detection probes of the heat exchanger, the burner and the zirconia oxygen sensor are all contained in the combustion chamber, and the air inlet pipe, the gas proportional valve and the burner are sequentially connected through a pipeline; the zirconia oxygen sensor passes through signal amplification circuit module with controller electric connection, the gas proportional valve with controller electric connection.

In the gas boiler, a zirconia oxygen sensor is electrically connected with a controller through a signal amplification circuit module, a detection probe of the zirconia oxygen sensor is contacted with flue gas to generate electric potential, the signal amplification circuit module receives an electric potential signal of the zirconia oxygen sensor and amplifies the electric potential signal, the amplified electric potential signal is transmitted to the controller, the controller outputs an execution instruction to a gas proportional valve after processing, and the opening of a valve port of the gas proportional valve is controlled to enable the gas boiler to be in the best working state at all times; compared with the prior art, the utility model discloses an add signal amplification circuit module between zirconia oxygen sensor and controller, amplify the electric potential signal of zirconia oxygen sensor output, improve the ability that the signal resists the line loss, the controller just can accurate detection electric potential size, improves the accuracy that detects oxygen content size in the flue gas to accurate feedback just can be made to oxygen content's size in the flue gas to the controller.

In one embodiment, the detection probe is disposed between the heat exchanger and the burner. The flue gas temperature in this interval enables zirconia oxygen sensor to reach the temperature that makes its effective work rapidly to make zirconia oxygen sensor can detect the oxygen content information in the flue gas more accurately, thereby can adjust the mixture ratio of gas and air more accurately, make the combustor keep at best operating condition.

In one embodiment, the gas boiler further comprises a prompting device, and the prompting device is electrically connected with the controller. When the controller detects that the oxygen content in the flue gas is abnormal, the controller sends an abnormal signal to the prompting device, and the prompting device reminds a user of stopping the machine for inspection.

In one embodiment, the prompting device is one of a display screen, a signal lamp or a loudspeaker.

In one embodiment, the controller is provided outside the gas boiler. Because the internal temperature of the gas boiler is higher, the controller is arranged on the outer side of the gas boiler mainly for ensuring the normal work of the controller.

In one embodiment, the controller is embedded with a signal detector for detecting whether the zirconia oxygen sensor works normally. When the signal detector receives an abnormal signal of the zirconia oxygen sensor, the signal detector feeds the abnormal signal back to the controller, and the controller closes the gas proportional valve after receiving the abnormal signal, so that the gas boiler stops working, and the gas boiler is prevented from working under a bad state.

In one embodiment, the combustion chamber is provided with a smoke outlet for communicating with the outside.

In one embodiment, the device further comprises a fan for discharging smoke, and the fan corresponds to the smoke discharge port.

In one embodiment, the heat exchanger is not limited to a finned heat exchanger, but may be a stainless steel coil, cast aluminum, or other forms of heat exchangers.

In one embodiment, the burner is not limited to a fire grate burner, but may be a metal fiber, ceramic, or other type of burner.

Drawings

Fig. 1 is a schematic structural view of a gas boiler according to an embodiment of the present invention;

fig. 2 is a block diagram illustrating a control flow of the gas boiler shown in fig. 1.

10. The device comprises a combustion chamber, 11, a smoke outlet, 12, a fan, 20, a controller, 21, a signal detector, 30, a heat exchanger, 40, a combustor, 50, an air inlet pipe, 60, a fuel gas proportional valve, 70, a zirconia oxygen sensor, 80, a signal amplification circuit module, 90 and a prompting device.

Detailed Description

In order to facilitate understanding of the present invention, the present invention will be described more fully hereinafter with reference to the accompanying drawings. The preferred embodiments of the present invention are shown in the drawings. The invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.

As shown in fig. 1 and 2, a gas boiler includes: the device comprises a combustion chamber 10, a controller 20, a heat exchanger 30, a combustor 40, an air inlet pipe 50, a gas proportional valve 60, a zirconia oxygen sensor 70 and a signal amplification circuit module 80, wherein detection probes of the heat exchanger 30, the combustor 40 and the zirconia oxygen sensor 70 are all accommodated in the combustion chamber 10, and the air inlet pipe 50, the gas proportional valve 60 and the combustor 40 are sequentially connected through a pipeline; the zirconia oxygen sensor 70 is electrically connected with the controller 20 through the signal amplification circuit module 80, and the fuel gas proportional valve 60 is electrically connected with the controller 20.

In the gas boiler, the zirconia oxygen sensor 70 is electrically connected with the controller 20 through the signal amplification circuit module 80, a detection probe of the zirconia oxygen sensor 70 is contacted with flue gas to generate electric potential, the signal amplification circuit module 80 receives the electric potential signal of the zirconia oxygen sensor 70 and amplifies the electric potential signal, the amplified electric potential signal is transmitted to the controller 20, the controller 20 outputs an execution instruction to the gas proportional valve 60 after processing, and the opening of the valve port of the gas proportional valve 60 is controlled to ensure that the gas boiler is in the best working state at all times; compared with the prior art, the utility model discloses an add signal amplification circuit module 80 between zirconia oxygen sensor 70 and controller 20, enlarge the electric potential value signal of zirconia oxygen sensor 70 output, improve the ability that this electric potential signal resisted the line loss, controller 20 just can accurate detection electric potential size, improves the accuracy that detects oxygen content size in the flue gas to the controller just can make accurate feedback to oxygen content's size in the flue gas.

In the above embodiment, the signal amplifying circuit module 80 is model LM 358.

Specifically, the detection probe is provided between the heat exchanger 30 and the burner 40. The flue gas temperature in this interval enables the zirconia oxygen sensor 70 to rapidly reach the temperature at which it effectively works, and makes the zirconia oxygen sensor 70 detect the oxygen content information in the flue gas more accurately, thereby can adjust the mixing ratio of the gas and the air more accurately, makes the combustor 40 keep in the best operating condition.

In one embodiment, the gas boiler further includes a prompting device 90 (see fig. 2), and the prompting device 90 is electrically connected to the controller 20. When the controller 20 detects that the oxygen content in the flue gas is abnormal, the controller 20 sends an abnormal signal to the prompting device 90, and the prompting device 90 prompts a user to stop checking.

In one embodiment, the prompting device 90 is one of a display screen, a signal light, or a speaker.

Specifically, the controller 20 is provided at an outer side of the gas boiler. Since the internal temperature of the gas boiler is high, the controller 20 is disposed outside the gas boiler mainly to ensure that the controller 20 can normally operate.

In one embodiment, the controller 20 is embedded with a signal detector 21 for detecting whether the zirconia oxygen sensor 70 is operating normally. When the signal detector 21 receives the abnormal signal of the zirconia oxygen sensor 70, the signal detector 21 feeds back the abnormal signal to the controller 20, and the controller 20 closes the gas proportional valve 60 after receiving the abnormal signal, so that the gas boiler stops operating to avoid the gas boiler operating in a bad state.

In one embodiment, the combustion chamber 10 is provided with a smoke outlet 11 for communicating with the outside.

In an embodiment, the gas boiler further comprises a fan 12 for discharging smoke, and the fan 12 corresponds to the smoke discharge port 11. The fan 12 discharges the flue gas in the combustion chamber 10 outwards from the smoke outlet 11.

Preferably, the heat exchanger 30 is not limited to a finned heat exchanger, but may be other forms of heat exchangers such as stainless steel coil, cast aluminum, and the like.

Preferably, the burner 40 is not limited to a fire row burner, but may be a metal fiber, ceramic, or other type of burner.

The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.

The above-mentioned embodiments only represent some embodiments of the present invention, and the description thereof is specific and detailed, but not to be construed as limiting the scope of the present invention. It should be noted that, for those skilled in the art, without departing from the spirit of the present invention, several variations and modifications can be made, which are within the scope of the present invention. Therefore, the protection scope of the present invention should be subject to the appended claims.

Claims (10)

1. A gas boiler, characterized in that it comprises: the device comprises a combustion chamber (10), a controller (20), a heat exchanger (30), a combustor (40), an air inlet pipe (50), a gas proportional valve (60), a zirconia oxygen sensor (70) and a signal amplification circuit module (80), wherein detection probes of the heat exchanger (30), the combustor (40) and the zirconia oxygen sensor (70) are all accommodated in the combustion chamber (10), and the air inlet pipe (50), the gas proportional valve (60) and the combustor (40) are sequentially connected through a pipeline;

the zirconia oxygen sensor (70) is electrically connected with the controller (20) through the signal amplification circuit module (80), and the fuel gas proportional valve (60) is electrically connected with the controller (20).

2. A boiler as claimed in claim 1, characterized in that said probe is arranged between said heat exchanger (30) and said burner (40).

3. A gas boiler according to claim 2, characterized in that it further comprises a prompting device (90), said prompting device (90) being electrically connected to said controller (20).

4. A gas boiler according to claim 3, characterized in that said prompting device (90) is one of a display screen, a signal light or a horn.

5. A gas boiler according to claim 1, characterized in that said controller (20) is arranged outside said gas boiler.

6. A boiler as claimed in claim 1, characterized in that said controller (20) is embedded with a signal detector (21) for detecting whether said zirconia oxygen sensor (70) is operating properly.

7. A boiler as claimed in claim 1, characterized in that said combustion chamber (10) is provided with a smoke outlet (11) for communication with the outside.

8. A boiler as claimed in claim 7, characterized by further comprising a fan (12) for exhausting smoke, said fan (12) being positioned in correspondence with said exhaust port (11).

9. A gas boiler according to any of the claims 1-8, characterized in that said heat exchanger (30) is a finned heat exchanger.

10. A gas boiler according to any of the claims 1-8, characterized in that said burner (40) is a fire grate burner.

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