Ultralow-voltage constant-temperature gas water heater

Abstract

The utility model relates to an ultra-low voltage constant temperature gas water heater. The ultra-low voltage constant temperature gas water heater comprises a power adapter arranged on the outer side of a machine body and a controller arranged in the machine body. An exhaust device and a combustion device for heating the heat exchanger are arranged in the machine body, and a water inlet device and a water outlet device which are connected with the heat exchanger are also arranged in the machine body; electrical elements of the air exhaust device, the heat exchanger, the combustion device, the water inlet device and the water outlet device are electrically connected with the controller through wires; the output end of the power adapter is conductively connected with the controller; the input end of the power adapter is conductively connected with commercial power voltage, so that alternating current of the commercial power voltage is converted into direct current power which is transmitted to the controller, power is supplied to electric appliance parts of the air exhaust device, the heat exchanger, the combustion device, the water inlet device and the water outlet device, and power utilization safety is effectively provided; the machine body of the heater water heater can be free of a grounding device.

Description

Technical Field

[0001] The utility model relates to gas equipment, in particular to an extra-low voltage constant temperature gas water heater used for bathing. Background Art

[0002] Existing household constant temperature gas instantaneous water heaters heat water flowing through heat exchange devices by burning gas to achieve the purpose of preparing hot water. However, they cannot do without the assistance of electricity. The current domestic mains voltage is AC220V, which is much higher than the human safety voltage of 36V.

[0003] Some existing ultra-low voltage constant temperature gas water heaters include direct DC models and AC models. Although these models have grounding protection, when the grounding protection fails, there is a risk of leakage, resulting in safety accidents. Utility Model Content

[0004] The purpose of the utility model is to provide an extra-low voltage constant temperature gas water heater, by electrically connecting all electrical components of the extra-low voltage constant temperature gas water heater with a controller with a built-in power supply, the controller is electrically connected to the mains voltage through a power adapter, so that the alternating current of the mains voltage is converted into a direct current power supply transmitted to the controller, so as to supply power to the electrical components of an exhaust device, a combustion device, a water inlet device and a water outlet device, thereby providing electricity safety, and the grounding device does not need to be installed on the body of the water heater.

[0005] The purpose of the utility model is achieved in this way:

[0006] An ultra-low voltage constant temperature gas water heater, comprising a power adapter arranged on the outside of a body and a controller arranged in the body;

[0007] An exhaust device and a combustion device for heating the heat exchanger are arranged in the machine body, and a water inlet device and a water outlet device connected to the heat exchanger are also arranged in the machine body; the electrical components of the exhaust device, the combustion device, the water inlet device and the water outlet device are all conductively connected to the controller through wires;

[0008] The output end of the power adapter is conductively connected to the controller; the input end of the power adapter is conductively connected to the mains voltage to convert the alternating current of the mains voltage into a direct current power supplied to the controller to supply power to the electrical components of the exhaust device, heat exchanger, combustion device, water inlet device and water outlet device.

[0009] The controller includes a power management module and a logic control module arranged on the main control board, and both the power management module and the logic control module are conductively connected to the main control board;

[0010] The power management module is the power supply, the logic control module is the single-chip microcomputer MCU, the single-chip microcomputer MCU is provided with a plurality of power terminals, each power terminal is conductively connected to the electrical components of the exhaust device, the combustion device, the water inlet device and the water outlet device.

[0011] The power adapter is a series power adapter, a parallel power adapter, a single-ended flyback power adapter or a single-ended forward power adapter.

[0012] The power adapter is a series power adapter, and the power adapter includes a connecting circuit conductively connected to the mains voltage and the controller, the connecting circuit includes a mains voltage rectifier and filter circuit, a transformer circuit, a power supply circuit and a charging circuit conductively connected to each other; wherein the mains voltage rectifier and filter circuit is conductively connected to the mains voltage, and the charging circuit is conductively connected to the controller.

[0013] The working voltage of electrical components of exhaust device, heat exchanger, combustion device, water inlet device and water outlet device shall be ≤DC36V.

[0014] The exhaust device includes a fan conductively connected to the controller, the air intake of the fan is arranged above the heat exchanger, and the air outlet of the fan is connected to the smoke exhaust duct on the body to exhaust the excess gas generated when the combustion device in the body is working.

[0015] The combustion device includes a burner arranged in a combustion chamber and heating a heat exchanger, and a gas regulating valve for conveying gas to the burner. An igniter for igniting the gas is arranged on the burner. Both the gas regulating valve and the igniter are conductively connected to the controller.

[0016] The water inlet device comprises a water inlet pipe connected to the water inlet end of the heat exchanger, and a water inlet temperature sensor and a water flow sensor arranged on the water inlet pipe. The water inlet temperature sensor and the water flow sensor are both conductively connected to the controller.

[0017] The water outlet device includes a water outlet pipe connected to the water outlet end of the heat exchanger and a water outlet temperature sensor arranged on the water outlet pipe. The water outlet end of the heat exchanger is provided with a thermostat, which is conductively connected to the water outlet temperature sensor and the controller.

[0018] An operation panel is arranged on the machine body, and the operation panel comprises a display for displaying a human-machine interaction interface, and an operation circuit board conductively connected to the display, and the operation circuit board is conductively connected to the controller.

[0019] The beneficial effects of the utility model are as follows:

[0020] The human-computer interaction interface can be used to open and close, and set the working parameters of the ultra-low voltage constant temperature gas water heater. Combined with the power management module and the logic control module to execute specific electrical signal instructions, it can detect the water flow of the ultra-low voltage constant temperature gas water heater, start and stop the fan and control the fan speed, switch the igniter, adjust the opening of the gas regulating valve (adjust the fire power), switch the solenoid valve, detect the on and off of the thermostat, detect the temperature (inlet water temperature, outlet water temperature, ambient temperature, etc.); in a low-voltage environment, it can achieve continuous and rapid hot water supply and achieve rapid constant temperature by cooperating with temperature sensors.

[0021] The input voltage and component operating voltages are both safe voltages (except for the ignition voltage. The high-voltage electric spark released by the igniter during ignition has an extremely small current and is consumed by the discharge of the opposite direction, so it will not cause any harm to people). There is no risk of electric leakage injuring people, which improves the safety factor of the machine. In addition, the ultra-low voltage constant temperature gas water heater does not need to be installed with a grounding device. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 The figure is a schematic diagram of the internal structure of an ultra-low voltage constant temperature gas water heater according to an embodiment of the utility model.

[0023] Figure 2 This is a schematic diagram of the connection structure between each electrical component and the controller of an ultra-low voltage constant temperature gas water heater according to an embodiment of the utility model.

[0024] Figure 3 The figure is a schematic diagram of the circuit structure of a power adapter according to an embodiment of the utility model. DETAILED DESCRIPTION

[0025] The utility model is further described below in conjunction with the accompanying drawings and embodiments.

[0026] See also Figure 1-Figure 3 , an ultra-low voltage constant temperature gas water heater, comprising a power adapter 9 arranged on the outside of a body 1 and a controller 2 arranged in the body 1;

[0027] The machine body 1 is provided with an exhaust device 3 and a combustion device 5 for heating a heat exchanger 4. The machine body 1 is also provided with a water inlet device 6 and a water outlet device 7 connected to the heat exchanger 4. The electrical components of the exhaust device 3, the heat exchanger 4, the combustion device 5, the water inlet device 6 and the water outlet device 7 are all conductively connected to the controller 2 through a wire 8.

[0028] The output end of the power adapter 9 is conductively connected to the controller 2; the input end of the power adapter 9 is conductively connected to the mains voltage to convert the alternating current of the mains voltage into a direct current power supplied to the controller 2 to supply power to the electrical components of the exhaust device 3, the heat exchanger 4, the combustion device 5, the water inlet device 6 and the water outlet device 7.

[0029] The power adapter 9 is connected to the controller 2 of the body 1 through a plug-in terminal; when the power adapter 9 is damaged, the power adapter 9 can be replaced at will.

[0030] The controller 2 includes a power management module and a logic control module arranged on the main control board, and both the power management module and the logic control module are conductively connected to the main control board;

[0031] The power management module is the power supply, the logic control module is the single-chip microcomputer MCU, and the single-chip microcomputer MCU is provided with a plurality of power terminals, each of which is conductively connected to the electrical components of the exhaust device 3, the combustion device 5, the water inlet device 6 and the water outlet device 7.

[0032] The power adapter 9 is a series power adapter, a parallel power adapter, a single-ended flyback power adapter or a single-ended forward power adapter.

[0033] The power adapter 9 is a series power adapter, and the power adapter 9 includes a connecting circuit conductively connected to the mains voltage and the controller 2, and the connecting circuit includes a mains voltage rectifier and filter circuit, a transformer circuit, a power supply circuit and a charging circuit conductively connected to each other; wherein the mains voltage rectifier and filter circuit is conductively connected to the mains voltage, and the charging circuit is conductively connected to the controller 2.

[0034] In this embodiment, the mains voltage rectification and filtering circuit includes a filter capacitor C1 for rectifying and filtering the mains voltage, the voltage transformation circuit includes a switching transformer L, the power supply circuit includes a freewheeling diode VD, and the charging circuit includes a charging capacitor C2;

[0035] The connection circuit also includes a power adapter switch tube VT conductively connected to the switch transformer L, and the emitter of the power adapter switch tube VT is conductively connected to the positive electrode of the charging capacitor C2.

[0036] During the saturation conduction period of the switch tube VT, the DC voltage U1 at the positive electrode of C1 is charged through the switch transformer L, the power adapter switch tube VT, the positive electrode of the charging capacitor C2, and the negative electrode of the charging capacitor C2. On the one hand, a DC voltage is established across the charging capacitor C2, and on the other hand, the magnetic energy in the switch transformer L is continuously increased. When the power adapter switch tube VT is cut off, the switch transformer L induces a negative voltage on the left and a positive voltage on the right, and the magnetic energy in the switch transformer L is released to the charging capacitor C2 and the load through the freewheeling diode VD. The level of the voltage U2 at the output end of the power adapter is determined by the length of the saturation conduction time of the switch tube VT, that is, by the width of the base excitation pulse.

[0037] The working voltage of the electrical components of the exhaust device 3, the heat exchanger 4, the combustion device 5, the water inlet device 6 and the water outlet device 7 are all ≤DC36V.

[0038] The exhaust device 3 includes a fan 10 conductively connected to the controller 2, the air intake of the fan 10 is arranged above the heat exchanger 4, and the air outlet of the fan 10 is connected to the smoke exhaust duct on the body 1 to exhaust the excess gas generated when the combustion device 5 in the body 1 is working.

[0039] The combustion device 5 includes a burner arranged in the combustion chamber and heating the heat exchanger 4, and a gas regulating valve 11 for delivering gas to the burner. The burner is provided with an igniter for igniting the gas. The gas regulating valve 11 and the igniter are both conductively connected to the controller 2.

[0040] The water inlet device 6 includes a water inlet pipe 12 connected to the water inlet end of the heat exchanger 4 , and a water inlet temperature sensor 13 and a water flow sensor 14 arranged on the water inlet pipe 12 . The water inlet temperature sensor 13 and the water flow sensor 14 are both conductively connected to the controller 2 .

[0041] The water outlet device 7 includes a water outlet pipe 15 connected to the water outlet end of the heat exchanger 4 and a water outlet temperature sensor 16 arranged on the water outlet pipe 15. A thermostat 17 is provided on the water outlet end of the heat exchanger 4. The thermostat 17 is conductively connected to the water outlet temperature sensor 16 and the controller 2.

[0042] An operation panel is provided on the machine body 1 , and the operation panel includes a display for displaying a human-machine interaction interface, and an operation circuit board conductively connected to the display, and the operation circuit board is conductively connected to the controller 2 .

[0043] The above is a preferred embodiment of the utility model, which shows and describes the basic principle, main features and advantages of the utility model. Those skilled in the art should understand that the utility model is not limited by the above embodiments, and the above embodiments and descriptions are only for explaining the principle of the utility model. The utility model may have various changes and improvements without departing from the spirit and scope of the utility model, and these changes and improvements fall within the scope of the utility model to be protected. The scope of protection of the utility model is defined by the attached claims and their equivalents.

Claims

1. An ultra-low voltage constant temperature gas water heater, characterized in that: It comprises a power adapter (9) arranged on the outside of the machine body (1) and a controller (2) arranged inside the machine body (1); An exhaust device (3) and a combustion device (5) for heating a heat exchanger (4) are provided in the machine body (1); a water inlet device (6) and a water outlet device (7) connected to the heat exchanger (4) are also provided in the machine body (1); the electrical components of the exhaust device (3), the heat exchanger (4), the combustion device (5), the water inlet device (6) and the water outlet device (7) are all electrically connected to the controller (2) via a wire (8); The output end of the power adapter (9) is conductively connected to the controller (2); The input end of the power adapter (9) is conductively connected to the mains voltage to convert the alternating current of the mains voltage into a direct current power source that is transmitted to the controller (2) to supply power to the electrical components of the exhaust device (3), the heat exchanger (4), the combustion device (5), the water inlet device (6) and the water outlet device (7).

2. The ultra-low voltage constant temperature gas water heater according to claim 1, characterized in that: The controller (2) comprises a power management module and a logic control module arranged on a main control board, wherein the power management module and the logic control module are both electrically connected to the main control board; The power management module is a power supply, the logic control module is a single-chip microcomputer MCU, and the single-chip microcomputer MCU is provided with a plurality of power terminals, each of which is electrically conductively connected to an electrical component of the exhaust device (3), the combustion device (5), the water inlet device (6), and the water outlet device (7).

3. The ultra-low voltage constant temperature gas water heater according to claim 1, characterized in that: The power adapter (9) is a series power adapter, a parallel power adapter, a single-ended flyback power adapter or a single-ended forward power adapter.

4. The ultra-low voltage constant temperature gas water heater according to claim 1, characterized in that: The power adapter (9) is a series-type power adapter, and the power adapter (9) comprises a connection circuit that is conductively connected to a mains voltage and a controller (2), and the connection circuit comprises a mains voltage rectification and filtering circuit, a voltage transformation circuit, a power supply circuit, and a charging circuit that are conductively connected to each other; wherein the mains voltage rectification and filtering circuit is conductively connected to the mains voltage, and the charging circuit is conductively connected to the controller (2).

5. The ultra-low voltage constant temperature gas water heater according to claim 1, characterized in that: The operating voltages of the electrical components of the exhaust device (3), the heat exchanger (4), the combustion device (5), the water inlet device (6) and the water outlet device (7) are all ≤DC36V.

6. The ultra-low voltage constant temperature gas water heater according to claim 1, characterized in that: The exhaust device (3) comprises a fan (10) electrically connected to the controller (2); an air intake of the fan (10) is arranged above the heat exchanger (4); and an air outlet of the fan (10) is connected to a smoke exhaust duct on the machine body (1) to exhaust excess gas generated when the combustion device (5) in the machine body (1) is in operation.

7. The ultra-low voltage constant temperature gas water heater according to claim 1, characterized in that: The combustion device (5) comprises a burner arranged in a combustion chamber and heating a heat exchanger (4), and a gas regulating valve (11) for delivering gas to the burner. An igniter for igniting the gas is provided on the burner. Both the gas regulating valve (11) and the igniter are electrically connected to the controller (2).

8. The ultra-low voltage constant temperature gas water heater according to claim 1, characterized in that: The water inlet device (6) comprises a water inlet pipe (12) connected to the water inlet end of the heat exchanger (4), and a water inlet temperature sensor (13) and a water flow sensor (14) arranged on the water inlet pipe (12); the water inlet temperature sensor (13) and the water flow sensor (14) are both conductively connected to the controller (2).

9. The ultra-low voltage constant temperature gas water heater according to claim 1, characterized in that: The water outlet device (7) comprises a water outlet pipe (15) connected to the water outlet end of the heat exchanger (4), and a water outlet temperature sensor (16) arranged on the water outlet pipe (15); a temperature controller (17) is arranged on the water outlet end of the heat exchanger (4); the temperature controller (17) is electrically connected to the water outlet temperature sensor (16) and the controller (2).

10. The ultra-low voltage constant temperature gas water heater according to claim 1, characterized in that: An operation panel is provided on the machine body (1), the operation panel comprising a display for displaying a human-machine interaction interface, and an operation circuit board conductively connected to the display, and the operation circuit board is conductively connected to the controller (2).

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