Fully premixed fuel gas heating water heater

Abstract

The utility model discloses a full premixing fuel gas heating water heater, the full premixing fuel gas heating water heater comprises a shell, a burner, a flame signal detection needle, a premixer and a circuit control board, the burner is installed at the upper end inside the shell, the circuit control board is installed inside the shell and is located on one side of the burner, and the flame signal detection needle is installed on one side of the premixer. The flame signal detection needle is installed at a fire outlet hole of the combustor, a fan is installed on one side of the premixer, an air inlet pipe and a smoke exhaust pipe are arranged on the upper portion of the shell, and the circuit control board comprises an MCU main control chip, an air speed control and detection circuit and a flame signal detection circuit. And the fan and the flame signal detection needle are electrically connected with a wind speed control and detection circuit and a flame signal detection circuit of the circuit control board respectively. According to the full-premixing fuel gas heating water heater, the revolution number of the draught fan can be adjusted through the air speed control and detection circuit, safety of the fuel gas heating water heater is guaranteed, excessive mechanical action components do not need to be designed, drifting of a blocking protection point is small, and performance is stable.

Description

Technical Field

[0001] This utility model relates to the field of heating boiler technology, specifically to a fully premixed gas heating and hot water boiler. Background Technology

[0002] After prolonged use, the flue pipes of gas-fired heating and hot water boilers are susceptible to blockage due to air impurities. Changes in gas pressure during operation can also cause blockages. This can lead to deviations in the combustion system parameters from the original factory settings, negatively impacting the boiler's performance and lifespan. To prevent severe blockages, manufacturers typically install multiple air pressure switches and sensors in the exhaust pipe. These devices monitor airflow and detect changes in intake and exhaust pressures to determine if blockages are present.

[0003] The existing flue gas blockage detection structure for gas-fired heating and hot water boilers has the following shortcomings during use:

[0004] 1) The wind pressure sensor can only monitor airflow and ignores the effect of voltage on the fan speed. When the voltage used is lower than the rated voltage, if the flue is severely blocked, the combustion conditions will deteriorate and the flue gas will exceed the standard. However, the fan speed will still be lower than the upper limit of the speed, which is not only environmentally unfriendly but also poses a safety hazard.

[0005] 2) The wind pressure switch uses a silicone rubber diaphragm to detect the pressure value. After a period of use, the silicone rubber ages and the pressure value drifts significantly. That is, the flue blockage protection value will deviate. When the air inlet is blocked, the change is only a few tens of Pascals, which is very small. Conventional wind pressure switches can hardly detect such a small pressure value, which can easily lead to inaccurate detection results. Utility Model Content

[0006] This utility model addresses the technical problems existing in the prior art by providing a fully premixed gas-fired heating and hot water boiler that uses a flame signal detection probe to detect the magnitude of the flame current, sends the flame current signal to the main control chip of the circuit control board through a flame signal detection circuit, monitors the combustion condition of the burner, and can adjust the fan speed through a wind speed control and detection circuit to ensure the safe operation of the gas-fired heating and hot water boiler. It also eliminates the need for too many or redundant mechanical moving parts, minimizes the drift of the blockage protection point, and provides stable and reliable performance.

[0007] To solve the above-mentioned technical problems, the present invention adopts the following technical solution:

[0008] A fully premixed gas-fired heating and hot water boiler includes a shell, a burner, a flame signal detection needle, a premixer, and a circuit control board. The burner is installed inside the upper part of the shell, and the circuit control board is installed inside the shell and located on one side of the burner. The flame signal detection needle is installed at the burner's flame outlet. The premixer is installed below the burner, and a fan is installed on one side of the premixer. An air inlet pipe and an exhaust pipe are provided above the shell. The air inlet pipe is installed on one side of the exhaust pipe and enters the shell to connect with the premixer. The exhaust pipe enters the shell to connect with the burner's air outlet. The circuit control board includes an MCU main control chip, a wind speed control and detection circuit, and a flame signal detection circuit. The wind speed control and detection circuit and the flame signal detection circuit are both electrically connected to the MCU main control chip. The fan and the flame signal detection needle are electrically connected to the wind speed control and detection circuit and the flame signal detection circuit of the circuit control board, respectively.

[0009] As a further improvement to the above technical solution, the fully premixed gas heating and hot water boiler includes a gas valve and a gas inlet channel. One end of the gas inlet channel is connected to the gas valve, and the other end of the gas inlet channel is connected to the inlet of the premixer.

[0010] As a further improvement to the above technical solution, the flame signal detection needle is a flame ion current detection needle.

[0011] As a further improvement to the above technical solution, the burner is surrounded by a heat exchanger assembly, which is composed of spiral annular coils with gaps between the coils.

[0012] As a further improvement to the above technical solution, a heating return water pipe is connected to one side of the lower end of the heat exchanger assembly, and a water pump is installed on the heating return water pipe.

[0013] As a further improvement to the above technical solution, the wind speed control and detection circuit includes a fan connector CN1, a resistor R4, a diode ZD1, a resistor R21, a transistor Q2, a resistor R5, a transistor Q1, a resistor R12, a resistor R1, and a resistor R3. One end of the resistor R12 is electrically connected to the MCU main control chip, and the other end of the resistor R12 is electrically connected to the base of the transistor Q1. One end of the resistor R1 is electrically connected to pin 2 of the fan connector CN1, and one end of the resistor R3 is electrically connected to pin 5 of the fan connector CN1. The resistor R1 is connected in parallel with the other end of the resistor R3 and then connected to the collector of the transistor Q1 to achieve the electrical connection between the transistor Q1 and the fan connector. One end of the resistor R5 is connected to the MCU main control chip, and the other end of the resistor R5 is connected to the collector of the transistor Q2. The base of the transistor Q2 is connected in sequence to one end of the resistor R21, the diode ZD1, and the resistor R4. The other end of the resistor R4 is connected to the fourth pin of the fan connector CN1 to achieve the electrical connection between the transistor Q2 and the fan connector.

[0014] As a further improvement to the above technical solution, the flame signal detection circuit includes resistors R30 and R34, a high-speed switching diode D1, a transistor Q7, resistors R37, R38, and R39, and a flame detection probe PT1. The flame detection probe PT1 is electrically connected to one end of resistors R39, R38, and R37 in sequence. The other end of resistor R37 is electrically connected to the emitter of transistor Q7. The collector of transistor Q7 is electrically connected to one end of the high-speed switching diode D1, one end of resistors R34 and R30 in sequence. The other end of resistor R30 is electrically connected to the MCU main control chip.

[0015] Compared with the prior art, the present invention has the following beneficial effects:

[0016] This utility model of a fully premixed gas-fired heating and hot water boiler includes a shell, a burner, a flame signal detection needle, a premixer, and a circuit control board. The burner is installed inside the upper part of the shell, the circuit control board is installed inside the shell and located on one side of the burner, the flame signal detection needle is installed at the flame outlet of the burner, a fan is installed on one side of the premixer, and an air inlet pipe and a flue pipe are provided on the top of the shell. The circuit control board includes an MCU main control chip, a wind speed control and detection circuit, and a flame signal detection circuit. The wind speed control and detection circuit and the flame signal detection circuit are both electrically connected to the MCU main control chip. The fan and the flame signal detection needle are respectively electrically connected to the wind speed control and detection circuit and the flame signal detection circuit of the circuit control board. The fully premixed gas-fired heating and hot water boiler provided by this utility model uses a flame signal detection probe to detect the magnitude of the flame current, and sends the flame current signal to the main control chip of the circuit control board through the flame signal detection circuit on the circuit control board. It can monitor the combustion condition of the burner, and adjust the fan speed through the wind speed control and detection circuit to ensure the safety of the gas-fired heating and hot water boiler operation. It also eliminates the need for too many or redundant mechanical moving parts, has less drift of the blockage protection point, and has stable and reliable performance. Attached Figure Description

[0017] Figure 1 This is a schematic diagram showing the relationship between the heating furnace of this utility model and the air inlet pipe and the flue pipe;

[0018] Figure 2 This is a diagram showing the internal structure of the heating furnace of this utility model;

[0019] Figure 3 This invention relates to the circuit principles of the MCU main control chip, wind speed control and detection circuit, and flame signal detection circuit of this utility model.

[0020] In the diagram: 1. Shell; 2. Burner; 21. Heat exchanger assembly; 3. Flame signal detection needle; 4. Premixer; 5. Circuit control board; 6. Inlet pipe; 7. Exhaust pipe; 8. Fan; 9. Gas valve; 10. Gas inlet channel; 11. Heating return water pipe; 12. Water pump. Detailed Implementation

[0021] The present invention will now be described in detail with reference to the accompanying drawings, which form part of this specification. The principles of the present invention will be illustrated through embodiments, and other aspects, features, and advantages of the present invention will become apparent from this detailed description. In the accompanying drawings, the same or similar parts in different figures are indicated by the same reference numerals.

[0022] like Figures 1-2As shown, Embodiment 1 of this utility model provides a fully premixed gas-fired heating and hot water boiler. This fully premixed gas-fired heating and hot water boiler includes a shell 1, a burner 2, a flame signal detection needle 3, a premixer 4, and a circuit control board 5. The burner 2 is installed inside the upper part of the shell 1. The circuit control board 5 is installed inside the shell 1 and located on one side of the burner 2. The flame signal detection needle 3 is installed at the flame outlet of the burner 2. The premixer 4 is installed below the burner 2. A fan 8 is installed on one side of the premixer 4. An air inlet is located above the shell 1. Pipe 6 and exhaust pipe 7 are installed. The intake pipe 6 is installed on one side of the exhaust pipe 7. After entering the housing 1, the intake pipe 6 is connected to the premixer 4. After entering the housing 1, the exhaust pipe 7 is connected to the exhaust port of the burner 2. The circuit control board 5 includes an MCU main control chip, a wind speed control and detection circuit, and a flame signal detection circuit. Both the wind speed control and detection circuit and the flame signal detection circuit are electrically connected to the MCU main control chip. The fan 8 and the flame signal detection pin 3 are electrically connected to the wind speed control and detection circuit and the flame signal detection circuit of the circuit control board 5, respectively. This invention uses a flame signal detection pin 3 to detect the magnitude of the flame current, and sends the flame current signal to the main control chip of the circuit control board 5 through the flame signal detection circuit on the circuit control board 5. The MCU main control chip of the circuit control board 5 can monitor the combustion condition of the burner 2 to determine whether the combustion condition of the burner 2 meets the good combustion range. If the combustion condition of the burner 2 does not meet the good combustion range, the speed of the fan 8 can be adjusted through the wind speed control and detection circuit to ensure the safety of the gas heating water heater. The fully premixed gas heating water heater set in this invention can effectively shut down the fully premixed gas heating water heater before the exhaust pipe is blocked or the flue gas exceeds the standard, which facilitates the adjustment of the fully premixed gas heating water heater, and does not require the design of too many or redundant mechanical moving parts. The blockage protection point drift is less, and the performance is more stable and reliable.

[0023] This utility model of a fully premixed gas-fired heating and hot water boiler includes a gas valve 9 and a gas inlet channel 10. One end of the gas inlet channel 10 is connected to the gas valve 9, and the other end of the gas inlet channel 10 is connected to the inlet of the premixer 4. In specific implementation, the gas valve 9 can be a SIT848 valve, the fan 8 can be an EBMRG128 fan, and the burner 2 can be a metal braided mesh burner.

[0024] The flame signal detection needle 3 is a flame ion current detection needle, which is used to detect the flame current and voltage value of the burner 2.

[0025] In this embodiment, a heat exchanger assembly 21 surrounds the burner 2. The heat exchanger assembly 21 is composed of spiral annular coils with gaps between the coils. By setting up the heat exchanger assembly, heat exchange can be achieved between the high-temperature flue gas generated by combustion and the flowing cold water when the burner 2 is working. This achieves efficient heat exchange between the flue gas and the cold water, improving thermal efficiency, reducing energy consumption, and lowering harmful emissions. A heating return water pipe 11 is connected to one side of the lower end of the heat exchanger assembly 21, and a water pump 12 is installed on the heating return water pipe 11.

[0026] like Figure 3 As shown, in specific implementation, the wind speed control and detection circuit of this utility model includes a fan 8 connector CN1, a resistor R4, a diode ZD1, a resistor R21, a transistor Q2, a resistor R5, a transistor Q1, a resistor R12, a resistor R1, and a resistor R3. One end of resistor R12 is electrically connected to the MCU main control chip, and the other end of resistor R12 is electrically connected to the base of transistor Q1. One end of resistor R1 is electrically connected to pin 2 of fan 8 connector CN1, and one end of resistor R3 is connected to pin 5 of fan 8 connector CN1. The circuit is electrically connected as follows: the other end of resistor R1 is connected in parallel with the other end of resistor R3 and then electrically connected to the collector of transistor Q1 to connect transistor Q1 to the fan 8 connector. One end of resistor R5 is electrically connected to the MCU main control chip, and the other end of resistor R5 is electrically connected to the collector of transistor Q2. The base of transistor Q2 is sequentially connected to resistor R21, diode ZD1, and one end of resistor R4. The other end of resistor R4 is electrically connected to pin 4 of fan 8 connector CN1 to connect transistor Q2 to the fan 8 connector. In specific implementation, transistors Q2 and Q1 in the wind speed control and detection circuit of this invention are both MMBT5551. The wind speed control and detection circuit of this invention is electrically connected to fan 8 through fan 8 connector CN1. The wind speed control and detection circuit measures the real-time wind speed of fan 8 and sends the measured real-time wind speed signal to the MCU main control chip. The wind speed detection circuit is used to detect the real-time rotation speed of the fan 8 and transmit the detected real-time rotation speed data signal to the MCU main control chip. The MCU main control chip sends a signal to the wind speed control and detection circuit based on the received real-time rotation speed data signal, and the wind speed control and detection circuit adjusts the rotation speed of the fan 8.

[0027] In its specific implementation, the flame signal detection circuit of this invention includes resistors R30 and R34, a high-speed switching diode D1, a transistor Q7, resistors R37, R38, and R39, and a flame detection probe PT1. The flame detection probe PT1 is electrically connected to one end of resistors R39, R38, and R37 in sequence. The other end of resistor R37 is electrically connected to the emitter of transistor Q7. The collector of transistor Q7 is electrically connected to one end of the high-speed switching diode D1, one end of resistors R34 and R30 in sequence. The other end of resistor R30 is electrically connected to the MCU main control chip. The flame signal detection circuit of this invention is electrically connected to the flame signal detection needle 3 via the flame detection probe PT1. The flame signal detection needle 3 collects and detects the current flame ion current signal value and sends the collected current flame ion current signal value to the MCU main control chip.

[0028] In practice, when the intake pipe 6 or exhaust pipe 7 gradually becomes blocked, the load on the fan 8 will inevitably decrease and the speed of the fan 8 will increase. It is necessary to adjust and reduce the duty cycle of the PWM output by the wind speed control and detection circuit through the MCU main control chip, so that the speed of the fan 8 can still be maintained at the original speed. When the mains voltage is lower than 170V, the speed of the fan 8 will inevitably decrease. The duty cycle of the PWM output by the wind speed control and detection circuit will be increased through the MCU main control chip, so that the speed of the fan 8 can still be maintained at the original speed.

[0029] The present invention has been described in detail above. The above description is only a preferred embodiment of the present invention and should not be construed as limiting the scope of this application. All equivalent changes and modifications made in accordance with the scope of this application should still fall within the scope of the present invention.

Claims

1. A fully premixed gas-fired heating and hot water boiler, characterized in that: The fully premixed gas-fired heating and hot water boiler includes a shell, a burner, a flame signal detection needle, a premixer, and a circuit control board. The burner is installed inside the upper part of the shell, and the circuit control board is installed inside the shell and located on one side of the burner. The flame signal detection needle is installed at the flame outlet of the burner. The premixer is installed below the burner, and a fan is installed on one side of the premixer. An air inlet pipe and an exhaust pipe are provided on the upper part of the shell. The air inlet pipe is installed on one side of the exhaust pipe. After entering the shell, the air inlet pipe is connected to the premixer. After entering the shell, the exhaust pipe is connected to the air outlet of the burner. The circuit control board includes an MCU main control chip, a wind speed control and detection circuit, and a flame signal detection circuit. The wind speed control and detection circuit and the flame signal detection circuit are both electrically connected to the MCU main control chip. The fan and the flame signal detection needle are electrically connected to the wind speed control and detection circuit and the flame signal detection circuit of the circuit control board, respectively.

2. The fully premixed gas-fired heating and hot water boiler according to claim 1, characterized in that: The fully premixed gas-fired heating and hot water boiler includes a gas valve and a gas inlet channel. One end of the gas inlet channel is connected to the gas valve, and the other end of the gas inlet channel is connected to the inlet of the premixer.

3. The fully premixed gas-fired heating and hot water boiler according to claim 1, characterized in that: The flame signal detection needle is a flame ion current detection needle.

4. The fully premixed gas-fired heating and hot water boiler according to claim 1, characterized in that: The burner is surrounded by a heat exchanger assembly, which is composed of spiral annular coils with gaps between the coils.

5. The fully premixed gas-fired heating and hot water boiler according to claim 4, characterized in that: A heating return water pipe is connected to one side of the lower end of the heat exchanger assembly, and a water pump is installed on the heating return water pipe.

6. The fully premixed gas-fired heating and hot water boiler according to claim 1, characterized in that: The wind speed control and detection circuit includes a fan connector CN1, resistor R4, diode ZD1, resistor R21, transistor Q2, resistor R5, transistor Q1, resistor R12, resistor R1, and resistor R3. One end of resistor R12 is electrically connected to the MCU main control chip, and the other end of resistor R12 is electrically connected to the base of transistor Q1. One end of resistor R1 is electrically connected to pin 2 of fan connector CN1, and one end of resistor R3 is electrically connected to pin 5 of fan connector CN1. The other end of resistor R1 is connected in parallel with the other end of resistor R3 and then electrically connected to the collector of transistor Q1 to achieve electrical connection between transistor Q1 and the fan connector. One end of resistor R5 is electrically connected to the MCU main control chip, and the other end of resistor R5 is electrically connected to the collector of transistor Q2. The base of transistor Q2 is electrically connected in sequence to resistor R21, diode ZD1, and one end of resistor R4. The other end of resistor R4 is electrically connected to pin 4 of fan connector CN1 to achieve electrical connection between transistor Q2 and the fan connector.

7. The fully premixed gas-fired heating and hot water boiler according to claim 1, characterized in that: The flame signal detection circuit includes resistors R30 and R34, a high-speed switching diode D1, a transistor Q7, resistors R37, R38, and R39, and a flame detection probe PT1. The flame detection probe PT1 is electrically connected to one end of resistors R39, R38, and R37 in sequence. The other end of resistor R37 is electrically connected to the emitter of transistor Q7. The collector of transistor Q7 is electrically connected to one end of the high-speed switching diode D1, one end of resistors R34 and R30 in sequence. The other end of resistor R30 is electrically connected to the MCU main control chip.

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