Boiler fan and domestic hot water simulation device

Abstract

The utility model discloses a boiler fan and domestic hot water simulation device. Comprising a step-down circuit, a fan PWM control operational amplifier circuit, a domestic hot water control operational amplifier circuit, a fan precision voltage frequency conversion circuit, a domestic hot water precision voltage frequency conversion circuit, a trigger circuit, a fan rotation speed feedback circuit and a domestic hot water flow feedback circuit. The step-down circuit, the fan PWM control operational amplifier circuit, the fan precision voltage frequency conversion circuit, the trigger circuit, the domestic hot water precision voltage frequency conversion circuit, the domestic hot water control operational amplifier circuit and the domestic hot water flow feedback circuit are electrically connected in sequence, and the fan rotating speed feedback circuit is electrically connected with the trigger circuit. According to the boiler fan and domestic hot water simulation device provided by the utility model, the state of domestic hot water of a boiler is simulated through the matching arrangement of all the modules, a solid fan is not needed for testing, the working efficiency is improved, the noise is reduced, and the generation of waste gas is also avoided.

Description

Technical Field

[0001] The utility model relates to the technical field of boilers, and particularly relates to a boiler fan and a domestic hot water simulation device. Background Technique

[0002] Without a complete set of structural components and supporting hydraulic and gas systems, the control system of the boiler cannot be started and operated normally. Especially when testing the performance of the fan, the physical fan is large and heavy, and the test is laborious. Moreover, when no noise reduction treatment is carried out, the noise of the actual fan is very large. When the furnace actually burns, the fan will discharge waste gas. If not handled properly, the waste gas will affect people's health.

[0003] Based on the above situation, the utility model provides a boiler fan and a domestic hot water simulation device, which can effectively solve the above problems. Content of the Utility Model

[0004] The purpose of the utility model is to provide a boiler fan and a domestic hot water simulation device. Through the coordinated setting of each module, the boiler fan and domestic hot water simulation device of the utility model realizes the simulation of the state of domestic hot water in the boiler, eliminates the need for testing with a physical fan, improves work efficiency, reduces noise, and also avoids the generation of waste gas.

[0005] The utility model is realized through the following technical solutions:

[0006] A boiler fan and a domestic hot water simulation device include a step-down circuit, a fan PWM control operational amplifier circuit, a domestic hot water control operational amplifier circuit, a fan precision voltage-frequency conversion circuit, a domestic hot water precision voltage-frequency conversion circuit, a trigger circuit, a fan speed feedback circuit, and a domestic hot water flow feedback circuit;

[0007] The step-down circuit, the fan PWM control operational amplifier circuit, the fan precision voltage-frequency conversion circuit, the trigger circuit, the domestic hot water precision voltage-frequency conversion circuit, the domestic hot water control operational amplifier circuit, and the domestic hot water flow feedback circuit are electrically connected in sequence, and the fan speed feedback circuit is electrically connected to the trigger circuit;

[0008] The step-down circuit is used to reduce the voltage value,

[0009] The fan PWM control operational amplifier circuit is used to amplify the PWM signal given by the controller to a variable voltage signal that can be recognized by the fan precision voltage-frequency conversion circuit,

[0010] The fan precision voltage-frequency conversion circuit is used to convert the voltage signal input from the fan PWM control operational amplifier circuit into a corresponding frequency signal,

[0011] The trigger circuit is used to automatically execute an output when the received frequency signal meets the trigger condition, and give an on and off signal corresponding to the frequency to the subsequent feedback circuit.

[0012] The domestic hot water control and amplification circuit is used to amplify the pulse signal given by the controller to a variable voltage signal recognizable by the domestic hot water precision voltage-frequency conversion circuit, and then transmit it.

[0013] The domestic hot water precision voltage-frequency conversion circuit is used to convert the voltage signal transmitted by the domestic hot water control and amplification circuit into a corresponding frequency signal.

[0014] The domestic hot water flow feedback circuit is used to convert the switch signal transmitted by the trigger circuit into a hall signal that can be recognized externally, and feedback it to the external controller to complete the closed-loop analog monitoring of the entire domestic hot water flow.

[0015] The fan speed feedback circuit is used to convert the switch signal transmitted by the trigger circuit into a hall signal that can be recognized externally, and feedback it to the external controller to complete the closed-loop analog monitoring of whether the entire fan operates at the expected speed.

[0016] The purpose of the present utility model is to provide a boiler fan and a domestic hot water simulation device. Through the coordinated setting of each module, the boiler fan and domestic hot water simulation device of the present utility model realize the simulation of the state of the boiler domestic hot water, do not need to use a physical fan for testing, improve work efficiency, reduce noise, and also avoid the generation of waste gas.

[0017] Preferably, the step-down circuit includes a low-dropout linear regulator IC1, a first connector J1, a PMOS transistor Q1, a diode D1, a first Schottky diode D2, a second Schottky diode D3, an electrolytic capacitor CE1, a first capacitor C1, a second capacitor C2, a third capacitor C3, a first resistor R1, a second resistor R2, a third resistor R3, and a thirty-fourth resistor R34.

[0018] The VIN pin of the first connector J1 is electrically connected to the D pole of the PMOS transistor Q1. The S pole of the PMOS transistor Q1 is electrically connected to the negative pole of the diode D1, the 2nd pin of the first Schottky diode D2, the VCC pin, the CTL pin, one end of the first capacitor C1, and the positive pole of the electrolytic capacitor CE1 of the low dropout linear regulator IC1 respectively. The negative pole of the electrolytic capacitor CE1 is electrically connected to the other end of the first capacitor C1, one end of the third capacitor C3, the GND pin of the low dropout linear regulator IC1, one end of the second capacitor C2, one end of the first resistor R1, one end of the third resistor R3, and the 2nd pin of the second Schottky diode D3 respectively. The other end of the first resistor R1 is electrically connected to the G pole of the PMOS transistor Q1 and the positive pole of the diode D1 respectively. The other end of the second capacitor C2 is electrically connected to the 1st pin of the first Schottky diode D2, the VOUT pin of the low dropout linear regulator IC1, the 3rd pin of the second Schottky diode D3, and the thirty-fourth resistor R34 respectively. The other end of the third capacitor C3 is electrically connected to one end of the second resistor R2 and the 1st pin of the second Schottky diode D3 respectively. The other end of the second resistor R2 is electrically connected to the other end of the third resistor R3.

[0019] Preferably, the fan PWM control operational amplifier circuit includes a first operational amplifier U2A, a third operational amplifier U2C, a fourth operational amplifier U2D, a fourth capacitor C4, a fifth capacitor C5, a sixth capacitor C6, a fourth resistor R4, a fifth resistor R5, a sixth resistor R6, a seventh resistor R7, an eighth resistor R8, a ninth resistor R9, and a tenth resistor R10;

[0020] The buck circuit is electrically connected to one end of the fourth capacitor C4, one end of the fourth resistor R4, and the 3rd pin of the first operational amplifier U2A respectively. The other end of the fourth capacitor C4 is electrically connected to the other end of the fourth resistor R4, one end of the fifth resistor R5, and the 2nd pin of the first operational amplifier U2A respectively. The other end of the fifth resistor R5 is electrically connected to the 4th pin of the first operational amplifier U2A and one end of the fifth capacitor C5 respectively. The 11th pin of the first operational amplifier U2A is electrically connected to the other end of the fifth capacitor C5, one end of the sixth capacitor C6, and one end of the eighth resistor R8 respectively. The other end of the sixth capacitor C6 is electrically connected to one end of the seventh resistor R7 and the 12th pin of the fourth operational amplifier U2D respectively. The other end of the seventh resistor R7 is electrically connected to one end of the sixth resistor R6. The other end of the sixth resistor R6 is electrically connected to the 1st pin of the first operational amplifier U2A. The other end of the eighth resistor R8 is electrically connected to the 10th pin of the third operational amplifier U2C and one end of the ninth resistor R9 respectively. The other end of the ninth resistor R9 is electrically connected to the 13th pin and the 14th pin of the fourth operational amplifier U2D respectively. The 9th pin of the third operational amplifier U2C is electrically connected to one end of the tenth resistor R10. The other end of the tenth resistor R10 is electrically connected to the 8th pin of the third operational amplifier U2C.

[0021] Preferably, the precision voltage-frequency conversion circuit of the blower includes a first voltage-frequency converter U2, a seventh capacitor C7, an eighth capacitor C8, a ninth capacitor C9, a tenth capacitor C10, an eleventh resistor R11, a twelfth resistor R12, a thirteenth resistor R13, a fourteenth resistor R14, a fifteenth resistor R15, a sixteenth resistor R16, a seventeenth resistor R17, an eighteenth resistor R18, a nineteenth resistor R19, and a twentieth resistor R20;

[0022] One end of the PWM control operational amplifier circuit of the blower is electrically connected to one end of the twelfth resistor R12. The other end of the twelfth resistor R12 is respectively electrically connected to the seventh capacitor C7 and the COMP IN pin of the first voltage-frequency converter U2. The REF I pin of the first voltage-frequency converter U2 is electrically connected to the eleventh resistor R11. The THR pin of the first voltage-frequency converter U2 is respectively electrically connected to the IOUT pin of the first voltage-frequency converter U2, one end of the thirteenth resistor R13, and one end of the tenth capacitor C10. The other end of the thirteenth resistor R13 is respectively electrically connected to the other end of the tenth capacitor C10, one end of the sixteenth resistor R16, and one end of the eighteenth resistor R18. The other end of the sixteenth resistor R16 is electrically connected to one end of the seventeenth resistor R17. The FREQ OUT pin of the first voltage-frequency converter U2 is respectively electrically connected to one end of the nineteenth resistor R19 and one end of the twentieth resistor R20. The RC pin of the first voltage-frequency converter U2 is respectively electrically connected to one end of the ninth capacitor C9 and one end of the fourteenth resistor R14. The other end of the fourteenth resistor R14 is electrically connected to one end of the fifteenth resistor R15. The other end of the ninth capacitor C9 is respectively electrically connected to the GND pin of the first voltage-frequency converter U2 and one end of the eighth capacitor C8. The other end of the eighth capacitor C8 is electrically connected to the VS pin of the first voltage-frequency converter U2. The trigger circuit is respectively electrically connected to the other end of the eighth capacitor C8, the other end of the fifteenth resistor R15, the other end of the seventeenth resistor R17, and the other end of the twentieth resistor R20.

[0023] Preferably, the trigger circuit includes a trigger U1, an eleventh capacitor C11, a twenty-first resistor R21, and a twenty-second resistor R22;

[0024] The precision voltage-frequency conversion circuit of the blower is electrically connected to the VCC pin of the flip-flop, the other end of the twenty-first resistor R21, the CLOCK2 pin of the flip-flop, and the other end of the twenty-second resistor R22. The VCC pin of the flip-flop is electrically connected to one end of the eleventh capacitor C11. The RESET2 pin of the flip-flop is electrically connected to one end of the twenty-first resistor R21 and the SET2 pin of the flip-flop. The DATA2 pin of the flip-flop is electrically connected to the Q2# pin of the flip-flop. The Q2 pin of the flip-flop is electrically connected to the blower speed feedback circuit. One end of the twenty-second resistor R22 of the flip-flop is electrically connected to the RESET1 pin of the flip-flop and one end of the SET1 pin of the flip-flop. The DATA1 pin of the flip-flop is electrically connected to the Q1# pin of the flip-flop. The CLOCK1 pin of the flip-flop is electrically connected to the precision voltage-frequency conversion circuit of the domestic hot water. The Q1 pin of the flip-flop is electrically connected to the domestic hot water flow feedback circuit.

[0025] Preferably, the precision voltage-frequency conversion circuit of the domestic hot water includes a second voltage-frequency converter U3, a twelfth capacitor C12, a thirteenth capacitor C13, a fourteenth capacitor C14, a twenty-third resistor R23, a twenty-fourth resistor R24, a twenty-fifth resistor R25, a twenty-sixth resistor R26, a twenty-seventh resistor R27, a twenty-eighth resistor R28, a twenty-ninth resistor R29, a thirtieth resistor R30, and a thirty-first resistor R31;

[0026] The REF I pin of the second voltage-frequency converter U3 is electrically connected to one end of the thirty-first resistor R31. The other end of the thirty-first resistor R31 is electrically connected to one end of the thirtieth resistor R30. The other end of the thirtieth resistor R30 is respectively electrically connected to one end of the twenty-eighth resistor R28, one end of the twenty-ninth resistor R29, and one end of the thirteenth capacitor C13. The THR pin of the second voltage-frequency converter U3 is respectively electrically connected to the other end of the twenty-ninth resistor R29, the other end of the thirteenth capacitor C13, and the IOUT pin of the second voltage-frequency converter U3. The COMP IN pin of the second voltage-frequency converter U3 is electrically connected to the domestic hot water control operational amplifier circuit. The VS pin of the second voltage-frequency converter U3 is electrically connected to one end of the fourteenth capacitor C14. The other end of the fourteenth capacitor C14 is respectively electrically connected to the domestic hot water control operational amplifier circuit, the GND pin of the second voltage-frequency converter U3, and one end of the twelfth capacitor C12. The RC pin of the second voltage-frequency converter U3 is respectively electrically connected to the other end of the twelfth capacitor C12 and one end of the twenty-sixth resistor R26. The other end of the twenty-sixth resistor R26 is electrically connected to one end of the twenty-third resistor R23. The other end of the twenty-third resistor R23 is respectively electrically connected to one end of the twenty-fourth resistor R24, one end of the twenty-seventh resistor R27, the trigger circuit, and the blower precision voltage-frequency conversion circuit. The other end of the twenty-seventh resistor R27 is electrically connected to the other end of the twenty-eighth resistor R28. The other end of the twenty-fourth resistor R24 is respectively electrically connected to one end of the twenty-fifth resistor R25 and the FREQ OUT pin of the second voltage-frequency converter U3. The other end of the twenty-fifth resistor R25 is electrically connected to the trigger circuit.

[0027] Preferably, the domestic hot water control operational amplifier circuit includes a second operational amplifier U2B, a fifteenth capacitor C15, a thirty-second resistor R32, a thirty-third resistor R33, and a first jumper J11;

[0028] The 7 pin of the second operational amplifier U2B is respectively electrically connected to the 6 pin of the second operational amplifier U2B and one end of the thirty-second resistor R32. The other end of the thirty-second resistor R32 is respectively electrically connected to the domestic hot water precision voltage-frequency conversion circuit and one end of the fifteenth capacitor C15. The other end of the fifteenth capacitor C15 is respectively electrically connected to the domestic hot water precision voltage-frequency conversion circuit, one end of the first jumper J11, and the domestic hot water flow feedback circuit. The other end of the first jumper J11 is electrically connected to one end of the thirty-third resistor R33. The other end of the thirty-third resistor R33 is electrically connected to the 5 pin of the second operational amplifier U2B.

[0029] Preferably, the domestic hot water flow feedback circuit includes a second connector J2, a second NPN transistor Q2, a sixteenth capacitor C16, a thirty-fifth resistor R35, a thirty-sixth resistor R36, a thirty-seventh resistor R37, and a second jumper J13;

[0030] The DHWTACHO pin of the second connector J2 is electrically connected to one end of the second jumper J13 and the collector of the second NPN transistor Q2 respectively. The other end of the second jumper J13 is electrically connected to one end of the thirty-seventh resistor R37. The other end of the thirty-seventh resistor R37 is electrically connected to one end of the sixteenth capacitor C16. The other end of the sixteenth capacitor C16 is electrically connected to the emitter of the second NPN transistor Q2, one end of the thirty-sixth resistor R36, and the domestic hot water control operational amplifier circuit respectively. The other end of the thirty-sixth resistor R36 is electrically connected to one end of the thirty-fifth resistor R35 and the base of the second NPN transistor Q2 respectively. The other end of the thirty-fifth resistor R35 is electrically connected to the trigger circuit.

[0031] Preferably, the fan speed feedback circuit includes a first NPN transistor Q1, a seventeenth capacitor C17, a thirty-eighth resistor R38, a thirty-ninth resistor R39, a fortieth resistor R40, and a third jumper J15;

[0032] The base of the first NPN transistor Q1 is electrically connected to one end of the thirty-eighth resistor R38 and one end of the thirty-ninth resistor R39 respectively. The other end of the thirty-eighth resistor R38 is electrically connected to the trigger circuit. The other end of the thirty-ninth resistor R39 is electrically connected to the emitter of the first NPN transistor Q1 and one end of the seventeenth capacitor C17 respectively. The other end of the seventeenth capacitor C17 is electrically connected to one end of the fortieth resistor R40. The other end of the fortieth resistor R40 is electrically connected to one end of the third jumper J15. The other end of the third jumper J15 is connected to the collector of the first NPN transistor Q1.

[0033] Compared with the prior art, the present invention has the following advantages and beneficial effects:

[0034] Through the cooperative setting of each module, the boiler fan and domestic hot water simulation device of the present invention realizes the simulation of the state of the boiler domestic hot water, eliminates the need for testing with a physical fan, improves work efficiency, reduces noise, and also avoids the generation of waste gas. Description of the Drawings

[0035] Figure 1 is the circuit block diagram of the present invention;

[0036] Figure 2 is the circuit schematic diagram of the present invention;

[0037] Figure 3This is the circuit schematic diagram of the step-down circuit described in the present utility model;

[0038] Figure 4 This is the circuit schematic diagram of the fan PWM control operational amplifier circuit described in the present utility model;

[0039] Figure 5 This is the circuit schematic diagram of the fan precision voltage-frequency conversion circuit described in the present utility model;

[0040] Figure 6 This is the circuit schematic diagram of the trigger circuit described in the present utility model;

[0041] Figure 7 This is the circuit schematic diagram of the domestic hot water precision voltage-frequency conversion circuit described in the present utility model;

[0042] Figure 8 This is the circuit schematic diagram of the domestic hot water control operational amplifier circuit described in the present utility model;

[0043] Figure 9 This is the circuit schematic diagram of the domestic hot water flow feedback circuit described in the present utility model;

[0044] Figure 10 This is the circuit schematic diagram of the fan speed feedback circuit described in the present utility model;

[0045] Figure 11 This is the circuit schematic diagram of the first connector J1 described in the present utility model;

[0046] Figure 12 This is the circuit schematic diagram of the first connector J2 described in the present utility model. Detailed implementation manners

[0047] In order to enable those skilled in the art to better understand the technical solutions of the present utility model, the following describes the preferred implementation schemes of the present utility model in combination with specific embodiments. However, it should be understood that the drawings are only for illustrative purposes and cannot be construed as a limitation of this patent; for better illustration of this embodiment, some components in the drawings will be omitted, enlarged or reduced, and do not represent the dimensions of the actual product; for those skilled in the art, it is understandable that some well-known structures and their descriptions in the drawings may be omitted. The positional relationships described in the drawings are only for illustrative purposes and cannot be construed as a limitation of this patent.

[0048] Example 1:

[0049] As Figures 1 to 12As shown, the utility model provides a boiler fan and domestic hot water simulation device, including a step-down circuit, a fan PWM control operational amplifier circuit, a domestic hot water control operational amplifier circuit, a fan precision voltage-frequency conversion circuit, a domestic hot water precision voltage-frequency conversion circuit, a trigger circuit, a fan speed feedback circuit, and a domestic hot water flow feedback circuit;

[0050] The step-down circuit, the fan PWM control operational amplifier circuit, the fan precision voltage-frequency conversion circuit, the trigger circuit, the domestic hot water precision voltage-frequency conversion circuit, the domestic hot water control operational amplifier circuit, and the domestic hot water flow feedback circuit are electrically connected in sequence, and the fan speed feedback circuit is electrically connected to the trigger circuit;

[0051] The step-down circuit is used to reduce the voltage value.

[0052] The fan PWM control operational amplifier circuit is used to amplify the PWM signal given by the controller and then transmit it to the fan precision voltage-frequency conversion circuit to generate a variable voltage signal that can be recognized.

[0053] The fan precision voltage-frequency conversion circuit is used to convert the voltage signal sent from the fan PWM control operational amplifier circuit into a corresponding frequency signal.

[0054] The trigger circuit is used to automatically execute the output when the received frequency signal meets the trigger condition, and give the subsequent feedback circuit an opening and closing signal of the corresponding frequency.

[0055] The domestic hot water control amplifier circuit is used to amplify the pulse signal given by the controller and then transmit it to the domestic hot water precision voltage-frequency conversion circuit to generate a variable voltage signal that can be recognized.

[0056] The domestic hot water precision voltage-frequency conversion circuit is used to convert the voltage signal sent from the domestic hot water control amplifier circuit into a corresponding frequency signal.

[0057] The domestic hot water flow feedback circuit is used to convert the switch signal transmitted by the trigger circuit into a hall signal that can be recognized externally, and feed it back to the external controller to complete the closed-loop simulation monitoring of the entire domestic hot water flow.

[0058] The fan speed feedback circuit is used to convert the switch signal transmitted by the trigger circuit into a hall signal that can be recognized externally, and feed it back to the external controller to complete the closed-loop simulation monitoring of whether the entire fan is running at the expected speed.

[0059] Embodiment 2:

[0060] like Figures 1 to 12As shown in the figure, the utility model provides a boiler fan and a domestic hot water simulation device, which includes a voltage reduction circuit, a fan PWM control operational amplifier circuit, a domestic hot water control operational amplifier circuit, a fan precision voltage-frequency conversion circuit, a domestic hot water precision voltage-frequency conversion circuit, a trigger circuit, a fan speed feedback circuit and a domestic hot water flow feedback circuit;

[0061] The voltage reduction circuit, the fan PWM control operational amplifier circuit, the fan precision voltage-frequency conversion circuit, the trigger circuit, the domestic hot water precision voltage-frequency conversion circuit, the domestic hot water control operational amplifier circuit and the domestic hot water flow feedback circuit are electrically connected in sequence, and the fan speed feedback circuit is electrically connected with the trigger circuit;

[0062] The voltage reduction circuit is used to reduce the voltage value,

[0063] The fan PWM control operational amplifier circuit is used to amplify the corresponding voltage of the PWM signal given by the controller and then send it to a variable voltage signal that can be recognized by the fan precision voltage-frequency conversion circuit,

[0064] The fan precision voltage-frequency conversion circuit is used to convert the voltage signal sent in by the fan PWM control operational amplifier circuit into a corresponding frequency signal,

[0065] The trigger circuit is used to automatically execute the output when the received frequency signal meets the trigger condition, and give an on and off signal of a corresponding frequency to the subsequent feedback circuit,

[0066] The domestic hot water control amplifier circuit is used to amplify the corresponding voltage of the pulse signal given by the controller and then send it to a variable voltage signal that can be recognized by the domestic hot water precision voltage-frequency conversion circuit,

[0067] The domestic hot water precision voltage-frequency conversion circuit is used to convert the voltage signal sent in by the domestic hot water control amplifier circuit into a corresponding frequency signal,

[0068] The domestic hot water flow feedback circuit is used to convert the switch signal sent by the trigger circuit into a hall signal that can be recognized by the outside, and feedback it to the external controller to complete the closed-loop simulation monitoring of the entire domestic hot water flow,

[0069] The fan speed feedback circuit is used to convert the switch signal sent by the trigger circuit into a hall signal that can be recognized by the outside, and feedback it to the external controller to complete the closed-loop simulation monitoring of whether the entire fan operates at the expected speed.

[0070] After defining the functions to be achieved by the boiler in the project evaluation stage, the functions of the selected control system fan and the hot water system can be quickly confirmed, reducing the waiting period for project development;

[0071] The actual fan (PWM) on the boiler is large and heavy, making it very inconvenient and unsafe to carry. This PWM fan simulator can achieve the rotational speed of the fan under various conditions, which is more energy-efficient; there is no need to build a domestic hot water waterway system, saving pipeline and installation materials;

[0072] The simulator is very small in volume and light in weight, can be moved anywhere, and does not require actual water connection, which is very convenient;

[0073] The boiler drive circuit continuously detects the parameters of each sensor. The simulation accuracy of the simulator directly affects the operation effect of the machine. Using precision components makes it more stable and reliable, and has a longer service life.

[0074] The step-down circuit includes a low-dropout linear regulator IC1, a first connector J1, a PMOS transistor Q1, a diode D1, a first Schottky diode D2, a second Schottky diode D3, an electrolytic capacitor CE1, a first capacitor C1, a second capacitor C2, a third capacitor C3, a first resistor R1, a second resistor R2, a third resistor R3, and a thirty-fourth resistor R34;

[0075] The VIN pin of the first connector J1 is electrically connected to the D pole of the PMOS transistor Q1. The S pole of the PMOS transistor Q1 is respectively electrically connected to the negative pole of the diode D1, the 2 pin of the first Schottky diode D2, the VCC pin, the CTL pin, one end of the first capacitor C1, and the positive pole of the electrolytic capacitor CE1. The negative pole of the electrolytic capacitor CE1 is respectively electrically connected to the other end of the first capacitor C1, one end of the third capacitor C3, the GND pin of the low-dropout linear regulator IC1, one end of the second capacitor C2, one end of the first resistor R1, one end of the third resistor R3, and the 2 pin of the second Schottky diode D3. The other end of the first resistor R1 is respectively electrically connected to the G pole of the PMOS transistor Q1 and the positive pole of the diode D1. The other end of the second capacitor C2 is respectively electrically connected to the 1 pin of the first Schottky diode D2, the VOUT pin of the low-dropout linear regulator IC1, the 3 pin of the second Schottky diode D3, and the thirty-fourth resistor R34. The other end of the third capacitor C3 is respectively electrically connected to one end of the second resistor R2 and the 1 pin of the second Schottky diode D3. The other end of the second resistor R2 is electrically connected to the other end of the third resistor R3.

[0076] Further, in another embodiment, the fan PWM control operational amplifier circuit includes a first operational amplifier U2A, a third operational amplifier U2C, a fourth operational amplifier U2D, a fourth capacitor C4, a fifth capacitor C5, a sixth capacitor C6, a fourth resistor R4, a fifth resistor R5, a sixth resistor R6, a seventh resistor R7, an eighth resistor R8, a ninth resistor R9, and a tenth resistor R10;

[0077] The step-down circuit is electrically connected to one end of the fourth capacitor C4, one end of the fourth resistor R4, and the 3rd pin of the first operational amplifier U2A respectively. The other end of the fourth capacitor C4 is electrically connected to the other end of the fourth resistor R4, one end of the fifth resistor R5, and the 2nd pin of the first operational amplifier U2A respectively. The other end of the fifth resistor R5 is electrically connected to the 4th pin of the first operational amplifier U2A and one end of the fifth capacitor C5 respectively. The 11th pin of the first operational amplifier U2A is electrically connected to the other end of the fifth capacitor C5, one end of the sixth capacitor C6, and one end of the eighth resistor R8 respectively. The other end of the sixth capacitor C6 is electrically connected to one end of the seventh resistor R7 and the 12th pin of the fourth operational amplifier U2D respectively. The other end of the seventh resistor R7 is electrically connected to one end of the sixth resistor R6. The other end of the sixth resistor R6 is electrically connected to the 1st pin of the first operational amplifier U2A. The other end of the eighth resistor R8 is electrically connected to the 10th pin of the third operational amplifier U2C and one end of the ninth resistor R9 respectively. The other end of the ninth resistor R9 is electrically connected to the 13th and 14th pins of the fourth operational amplifier U2D respectively. The 9th pin of the third operational amplifier U2C is electrically connected to one end of the tenth resistor R10. The other end of the tenth resistor R10 is electrically connected to the 8th pin of the third operational amplifier U2C.

[0078] Further, in another embodiment, the precision voltage-frequency conversion circuit of the fan includes a first voltage-frequency converter U2, a seventh capacitor C7, an eighth capacitor C8, a ninth capacitor C9, a tenth capacitor C10, an eleventh resistor R11, a twelfth resistor R12, a thirteenth resistor R13, a fourteenth resistor R14, a fifteenth resistor R15, a sixteenth resistor R16, a seventeenth resistor R17, an eighteenth resistor R18, a nineteenth resistor R19, and a twentieth resistor R20;

[0079] The PWM control operational amplifier circuit of the blower is electrically connected to one end of the twelfth resistor R12. The other end of the twelfth resistor R12 is respectively electrically connected to the seventh capacitor C7 and the COMP IN pin of the first voltage-frequency converter U2. The REF I pin of the first voltage-frequency converter U2 is electrically connected to the eleventh resistor R11. The THR pin of the first voltage-frequency converter U2 is respectively electrically connected to the IOUT pin of the first voltage-frequency converter U2, one end of the thirteenth resistor R13, and one end of the tenth capacitor C10. The other end of the thirteenth resistor R13 is respectively electrically connected to the other end of the tenth capacitor C10, one end of the sixteenth resistor R16, and one end of the eighteenth resistor R18. The other end of the sixteenth resistor R16 is electrically connected to one end of the seventeenth resistor R17. The FREQ OUT pin of the first voltage-frequency converter U2 is respectively electrically connected to one end of the nineteenth resistor R19 and one end of the twentieth resistor R20. The RC pin of the first voltage-frequency converter U2 is respectively electrically connected to one end of the ninth capacitor C9 and one end of the fourteenth resistor R14. The other end of the fourteenth resistor R14 is electrically connected to one end of the fifteenth resistor R15. The other end of the ninth capacitor C9 is respectively electrically connected to the GND pin of the first voltage-frequency converter U2 and one end of the eighth capacitor C8. The other end of the eighth capacitor C8 is electrically connected to the VS pin of the first voltage-frequency converter U2. The trigger circuit is respectively electrically connected to the other end of the eighth capacitor C8, the other end of the fifteenth resistor R15, the other end of the seventeenth resistor R17, and the other end of the twentieth resistor R20.

[0080] Further, in another embodiment, the trigger circuit includes a trigger U1, an eleventh capacitor C11, a twenty-first resistor R21, and a twenty-second resistor R22;

[0081] The precision voltage-frequency conversion circuit of the blower is respectively electrically connected to the VCC pin of the trigger, the other end of the twenty-first resistor R21, the CLOCK2 pin of the trigger, and the other end of the twenty-second resistor R22. The VCC pin of the trigger is electrically connected to one end of the eleventh capacitor C11. The RESET2 pin of the trigger is respectively electrically connected to one end of the twenty-first resistor R21 and the SET2 pin of the trigger. The DATA2 pin of the trigger is electrically connected to the Q2# pin of the trigger. The Q2 pin of the trigger is electrically connected to the blower speed feedback circuit. One end of the twenty-second resistor R22 of the trigger is respectively electrically connected to the RESET1 pin of the trigger and one end of the SET1 pin of the trigger. The DATA1 pin of the trigger is electrically connected to the Q1# pin of the trigger. The CLOCK1 pin of the trigger is electrically connected to the precision voltage-frequency conversion circuit of domestic hot water. The Q1 pin of the trigger is electrically connected to the domestic hot water flow feedback circuit.

[0082] Further, in another embodiment, the domestic hot water precision voltage-frequency conversion circuit includes a second voltage-frequency converter U3, a twelfth capacitor C12, a thirteenth capacitor C13, a fourteenth capacitor C14, a twenty-third resistor R23, a twenty-fourth resistor R24, a twenty-fifth resistor R25, a twenty-sixth resistor R26, a twenty-seventh resistor R27, a twenty-eighth resistor R28, a twenty-ninth resistor R29, a thirtieth resistor R30, and a thirty-first resistor R31;

[0083] One end of the REF I pin of the second voltage-frequency converter U3 is electrically connected to one end of the thirty-first resistor R31. The other end of the thirty-first resistor R31 is electrically connected to one end of the thirtieth resistor R30. The other end of the thirtieth resistor R30 is electrically connected to one end of the twenty-eighth resistor R28, one end of the twenty-ninth resistor R29, and one end of the thirteenth capacitor C13 respectively. The THR pin of the second voltage-frequency converter U3 is electrically connected to the other end of the twenty-ninth resistor R29, the other end of the thirteenth capacitor C13, and the IOUT pin of the second voltage-frequency converter U3 respectively. The COMP IN pin of the second voltage-frequency converter U3 is electrically connected to the domestic hot water control operational amplifier circuit. The VS pin of the second voltage-frequency converter U3 is electrically connected to one end of the fourteenth capacitor C14. The other end of the fourteenth capacitor C14 is electrically connected to the domestic hot water control operational amplifier circuit, the GND pin of the second voltage-frequency converter U3, and one end of the twelfth capacitor C12 respectively. The RC pin of the second voltage-frequency converter U3 is electrically connected to the other end of the twelfth capacitor C12 and one end of the twenty-sixth resistor R26 respectively. The other end of the twenty-sixth resistor R26 is electrically connected to one end of the twenty-third resistor R23. The other end of the twenty-third resistor R23 is electrically connected to one end of the twenty-fourth resistor R24, one end of the twenty-seventh resistor R27, the trigger circuit, and the blower precision voltage-frequency conversion circuit respectively. The other end of the twenty-seventh resistor R27 is electrically connected to the other end of the twenty-eighth resistor R28. The other end of the twenty-fourth resistor R24 is electrically connected to one end of the twenty-fifth resistor R25 and the FREQ OUT pin of the second voltage-frequency converter U3 respectively. The other end of the twenty-fifth resistor R25 is electrically connected to the trigger circuit.

[0084] Further, in another embodiment, the domestic hot water control operational amplifier circuit includes a second operational amplifier U2B, a fifteenth capacitor C15, a thirty-second resistor R32, a thirty-third resistor R33, and a first jumper J11;

[0085] Pin 7 of the second operational amplifier U2B is electrically connected to pin 6 of the second operational amplifier U2B and one end of the thirty-second resistor R32 respectively. The other end of the thirty-second resistor R32 is electrically connected to the domestic hot water precision voltage-frequency conversion circuit and one end of the fifteenth capacitor C15 respectively. The other end of the fifteenth capacitor C15 is electrically connected to the domestic hot water precision voltage-frequency conversion circuit, one end of the first jumper J11, and the domestic hot water flow feedback circuit respectively. The other end of the first jumper J11 is electrically connected to one end of the thirty-third resistor R33. The other end of the thirty-third resistor R33 is electrically connected to pin 5 of the second operational amplifier U2B.

[0086] Further, in another embodiment, the domestic hot water flow feedback circuit includes a second connector J2, a second NPN transistor Q2, a sixteenth capacitor C16, a thirty-fifth resistor R35, a thirty-sixth resistor R36, a thirty-seventh resistor R37, and a second jumper J13;

[0087] The DHWTACHO pin of the second connector J2 is electrically connected to one end of the second jumper J13 and the collector of the second NPN transistor Q2 respectively. The other end of the second jumper J13 is electrically connected to one end of the thirty-seventh resistor R37. The other end of the thirty-seventh resistor R37 is electrically connected to one end of the sixteenth capacitor C16. The other end of the sixteenth capacitor C16 is electrically connected to the emitter of the second NPN transistor Q2, one end of the thirty-sixth resistor R36, and the domestic hot water control operational amplifier circuit respectively. The other end of the thirty-sixth resistor R36 is electrically connected to one end of the thirty-fifth resistor R35 and the base of the second NPN transistor Q2 respectively. The other end of the thirty-fifth resistor R35 is electrically connected to the trigger circuit.

[0088] Further, in another embodiment, the fan speed feedback circuit includes a first NPN transistor Q1, a seventeenth capacitor C17, a thirty-eighth resistor R38, a thirty-ninth resistor R39, a fortieth resistor R40, and a third jumper J15;

[0089] The base of the first NPN transistor Q1 is electrically connected to one end of the thirty-eighth resistor R38 and one end of the thirty-ninth resistor R39 respectively. The other end of the thirty-eighth resistor R38 is electrically connected to the trigger circuit. The other end of the thirty-ninth resistor R39 is electrically connected to the emitter of the first NPN transistor Q1 and one end of the seventeenth capacitor C17 respectively. The other end of the seventeenth capacitor C17 is electrically connected to one end of the fortieth resistor R40. The other end of the fortieth resistor R40 is electrically connected to one end of the third jumper J15. The other end of the third jumper J15 is connected to the collector of the first NPN transistor Q1.

[0090] A control method for a boiler fan and a domestic hot water simulation device includes the following steps:

[0091] Step S1: Connect the control line of the boiler PWM fan to the terminals of the first connector J1 correspondingly.

[0092] Step S2: Turn on the PCB power supply of the furnace. The control unit of the boiler inputs a 24V voltage to both ends of Vin and GND of the analog board. The analog board stabilizes the 24V voltage to 5V through a buck circuit and supplies it to the power supply pins of each integrated IC on the analog board to ensure the normal operation of the chip.

[0093] Step S3: When the boiler enters different stages, the set fan speed inside is transmitted to the internal processing unit of the analog board through the PWM interface of the terminals of the first connector J1, and the signal transmitted in is amplified by the operational amplifier U2.

[0094] Step S4: Transmit the amplified signal to the first voltage-frequency converter U2 to convert the voltage into frequency.

[0095] Step S5: The corresponding frequency then passes through the flip-flop U1, and the signal feedback signal is transmitted to the PCB control unit of the boiler through the TACHO pin of the first connector J1 by controlling the turn-off of the first NPN transistor Q1. The control unit of the boiler makes corresponding next-step instructions by receiving the signal from the TACHO pin.

[0096] Step S6: Connect the control line of the boiler domestic hot water to the terminals of the second connector J2 correspondingly.

[0097] Step S7: The control unit of the boiler provides 5V power supply and connects it to the CCW pin and GND pin of the second connector J2.

[0098] Step S8: Apply a variable voltage signal to the WLPER pin of the second connector J2, and the signal transmitted in is amplified by the operational amplifier U2.

[0099] Step S9: Transmit the amplified signal to the second voltage-frequency converter U3 to convert the voltage into frequency.

[0100] Step S10: The corresponding frequency then passes through the flip-flop U1, and the signal feedback signal is transmitted to the PCB control unit of the boiler through the DHWTACHO pin of the second connector J2 by controlling the turn-off of the second NPN transistor Q2. The control unit of the boiler starts the instruction for the domestic hot water mode of the boiler by receiving the signal from the DHWTACHO pin.

[0101] Step S11: By closing the input of the signal of the WLPER pin of the second connector J2, when simulating no water flow, the furnace turns off the domestic hot water mode.

[0102] Step S12: Steps 6 to 11 can be repeatedly operated to confirm the working state of the boiler under different water flow rates.

[0103] Based on the description and drawings of the present utility model, those skilled in the art can easily manufacture or use the boiler fan and domestic hot water simulation device of the present utility model, and can achieve the positive effects recorded in the present utility model.

[0104] Unless otherwise specified, in the present utility model, if there are terms such as "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., the orientation or positional relationship indicated is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, the terms describing the orientation or positional relationship in the present utility model are only for illustrative purposes and should not be construed as a limitation of this patent. For those of ordinary skill in the art, the specific meanings of the above terms can be understood in combination with the drawings and according to specific circumstances.

[0105] Unless otherwise clearly defined and limited, in the present utility model, if there are terms such as "set", "connected" and "connected", they should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be directly connected, or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0106] The above are only the preferred embodiments of the present utility model, and do not impose any form of limitation on the present utility model. Any simple modification or equivalent change made to the above embodiments based on the technical essence of the present utility model falls within the protection scope of the present utility model.

Claims

1. A boiler fan and domestic hot water simulation device, characterized in that: It includes a step-down circuit, a fan PWM control operational amplifier circuit, a domestic hot water control operational amplifier circuit, a fan precision voltage-frequency conversion circuit, a domestic hot water precision voltage-frequency conversion circuit, a trigger circuit, a fan speed feedback circuit, and a domestic hot water flow feedback circuit; The step-down circuit, the fan PWM control operational amplifier circuit, the fan precision voltage-frequency conversion circuit, the trigger circuit, the domestic hot water precision voltage-frequency conversion circuit, the domestic hot water control operational amplifier circuit, and the domestic hot water flow feedback circuit are electrically connected in sequence, and the fan speed feedback circuit is electrically connected to the trigger circuit; The step-down circuit is used to reduce the voltage value, The fan PWM control operational amplifier circuit is used to amplify the corresponding voltage of the PWM signal given by the controller and then transmit it to a variable voltage signal that can be recognized by the fan precision voltage-frequency conversion circuit, The fan precision voltage-frequency conversion circuit is used to convert the voltage signal transmitted by the fan PWM control operational amplifier circuit into a corresponding frequency signal, The trigger circuit is used to automatically execute an output when the received frequency signal meets the trigger condition, and give an on and off signal of a corresponding frequency to the subsequent feedback circuit, The domestic hot water control amplifier circuit is used to amplify the corresponding voltage of the pulse signal given by the controller and then transmit it to a variable voltage signal that can be recognized by the domestic hot water precision voltage-frequency conversion circuit, The domestic hot water precision voltage-frequency conversion circuit is used to convert the voltage signal transmitted by the domestic hot water control amplifier circuit into a corresponding frequency signal, The domestic hot water flow feedback circuit is used to convert the switch signal transmitted by the trigger circuit into a hall signal that can be recognized externally and feedback it to the external controller to complete the closed-loop analog monitoring of the entire domestic hot water flow, The fan speed feedback circuit is used to convert the switch signal transmitted by the trigger circuit into a hall signal that can be recognized externally and feedback it to the external controller to complete the closed-loop analog monitoring of whether the entire fan operates at the expected speed.

2. The boiler fan and domestic hot water simulation device according to claim 1, characterized in that: The step-down circuit includes a low-dropout linear regulator IC1, a first connector J1, a PMOS transistor Q1, a diode D1, a first Schottky diode D2, a second Schottky diode D3, an electrolytic capacitor CE1, a first capacitor C1, a second capacitor C2, a third capacitor C3, a first resistor R1, a second resistor R2, a third resistor R3, and a thirty-fourth resistor R34; The VIN pin of the first connector J1 is electrically connected to the D pole of the PMOS transistor Q1. The S pole of the PMOS transistor Q1 is electrically connected to the negative pole of the diode D1, the 2nd pin of the first Schottky diode D2, the VCC pin, the CTL pin, one end of the first capacitor C1, and the positive pole of the electrolytic capacitor CE1 of the low dropout linear regulator IC1 respectively. The negative pole of the electrolytic capacitor CE1 is electrically connected to the other end of the first capacitor C1, one end of the third capacitor C3, the GND pin of the low dropout linear regulator IC1, one end of the second capacitor C2, one end of the first resistor R1, one end of the third resistor R3, and the 2nd pin of the second Schottky diode D3 respectively. The other end of the first resistor R1 is electrically connected to the G pole of the PMOS transistor Q1 and the positive pole of the diode D1 respectively. The other end of the second capacitor C2 is electrically connected to the 1st pin of the first Schottky diode D2, the VOUT pin of the low dropout linear regulator IC1, the 3rd pin of the second Schottky diode D3, and the thirty-fourth resistor R34 respectively. The other end of the third capacitor C3 is electrically connected to one end of the second resistor R2 and the 1st pin of the second Schottky diode D3 respectively. The other end of the second resistor R2 is electrically connected to the other end of the third resistor R3.

3. The boiler fan and domestic hot water simulation device according to claim 2, characterized in that: The fan PWM control operational amplifier circuit includes a first operational amplifier U2A, a third operational amplifier U2C, a fourth operational amplifier U2D, a fourth capacitor C4, a fifth capacitor C5, a sixth capacitor C6, a fourth resistor R4, a fifth resistor R5, a sixth resistor R6, a seventh resistor R7, an eighth resistor R8, a ninth resistor R9, and a tenth resistor R10. The buck circuit is electrically connected to one end of the fourth capacitor C4, one end of the fourth resistor R4, and the 3rd pin of the first operational amplifier U2A respectively. The other end of the fourth capacitor C4 is electrically connected to the other end of the fourth resistor R4, one end of the fifth resistor R5, and the 2nd pin of the first operational amplifier U2A respectively. The other end of the fifth resistor R5 is electrically connected to the 4th pin of the first operational amplifier U2A and one end of the fifth capacitor C5 respectively. The 11th pin of the first operational amplifier U2A is electrically connected to the other end of the fifth capacitor C5, one end of the sixth capacitor C6, and one end of the eighth resistor R8 respectively. The other end of the sixth capacitor C6 is electrically connected to one end of the seventh resistor R7 and the 12th pin of the fourth operational amplifier U2D respectively. The other end of the seventh resistor R7 is electrically connected to one end of the sixth resistor R6. The other end of the sixth resistor R6 is electrically connected to the 1st pin of the first operational amplifier U2A. The other end of the eighth resistor R8 is electrically connected to the 10th pin of the third operational amplifier U2C and one end of the ninth resistor R9 respectively. The other end of the ninth resistor R9 is electrically connected to the 13th pin and the 14th pin of the fourth operational amplifier U2D respectively. The 9th pin of the third operational amplifier U2C is electrically connected to one end of the tenth resistor R10. The other end of the tenth resistor R10 is electrically connected to the 8th pin of the third operational amplifier U2C.

4. The boiler fan and domestic hot water simulation device according to claim 1, characterized in that: The precision voltage-frequency conversion circuit of the fan includes a first voltage-frequency converter U2, a seventh capacitor C7, an eighth capacitor C8, a ninth capacitor C9, a tenth capacitor C10, an eleventh resistor R11, a twelfth resistor R12, a thirteenth resistor R13, a fourteenth resistor R14, a fifteenth resistor R15, a sixteenth resistor R16, a seventeenth resistor R17, an eighteenth resistor R18, a nineteenth resistor R19, and a twentieth resistor R20; One end of the twelfth resistor R12 of the fan PWM control operational amplifier circuit is electrically connected, and the other end of the twelfth resistor R12 is respectively electrically connected to the seventh capacitor C7 and the COMP IN pin of the first voltage-frequency converter U2. The REF I pin of the first voltage-frequency converter U2 is electrically connected to the eleventh resistor R11. The THR pin of the first voltage-frequency converter U2 is respectively electrically connected to the IOUT pin of the first voltage-frequency converter U2, one end of the thirteenth resistor R13, and one end of the tenth capacitor C10. The other end of the thirteenth resistor R13 is respectively electrically connected to the other end of the tenth capacitor C10, one end of the sixteenth resistor R16, and one end of the eighteenth resistor R18. The other end of the sixteenth resistor R16 is electrically connected to one end of the seventeenth resistor R17. The FREQ OUT pin of the first voltage-frequency converter U2 is respectively electrically connected to one end of the nineteenth resistor R19 and one end of the twentieth resistor R20. The RC pin of the first voltage-frequency converter U2 is respectively electrically connected to one end of the ninth capacitor C9 and one end of the fourteenth resistor R14. The other end of the fourteenth resistor R14 is electrically connected to one end of the fifteenth resistor R15. The other end of the ninth capacitor C9 is respectively electrically connected to the GND pin of the first voltage-frequency converter U2 and one end of the eighth capacitor C8. The other end of the eighth capacitor C8 is electrically connected to the VS pin of the first voltage-frequency converter U2. The trigger circuit is respectively electrically connected to the other end of the eighth capacitor C8, the other end of the fifteenth resistor R15, the other end of the seventeenth resistor R17, and the other end of the twentieth resistor R20.

5. The boiler fan and domestic hot water simulation device according to claim 1, characterized in that: The trigger circuit includes a trigger U1, an eleventh capacitor C11, a twenty-first resistor R21, and a twenty-second resistor R22; The precision voltage-frequency conversion circuit of the fan is electrically connected to the VCC pin of the flip-flop, the other end of the twenty-first resistor R21, the CLOCK2 pin of the flip-flop, and the other end of the twenty-second resistor R22. The VCC pin of the flip-flop is electrically connected to one end of the eleventh capacitor C11. The RESET2 pin of the flip-flop is electrically connected to one end of the twenty-first resistor R21 and the SET2 pin of the flip-flop. The DATA2 pin of the flip-flop is electrically connected to the Q2# pin of the flip-flop. The Q2 pin of the flip-flop is electrically connected to the fan speed feedback circuit. One end of the twenty-second resistor R22 of the flip-flop is electrically connected to the RESET1 pin of the flip-flop and one end of the SET1 pin of the flip-flop. The DATA1 pin of the flip-flop is electrically connected to the Q1# pin of the flip-flop. The CLOCK1 pin of the flip-flop is electrically connected to the precision voltage-frequency conversion circuit of domestic hot water. The Q1 pin of the flip-flop is electrically connected to the domestic hot water flow feedback circuit.

6. The boiler fan and domestic hot water simulation device according to claim 1, characterized in that: The precision voltage-frequency conversion circuit of domestic hot water includes a second voltage-frequency converter U3, a twelfth capacitor C12, a thirteenth capacitor C13, a fourteenth capacitor C14, a twenty-third resistor R23, a twenty-fourth resistor R24, a twenty-fifth resistor R25, a twenty-sixth resistor R26, a twenty-seventh resistor R27, a twenty-eighth resistor R28, a twenty-ninth resistor R29, a thirtieth resistor R30, and a thirty-first resistor R31; The REF I pin of the second voltage-frequency converter U3 is electrically connected to one end of the thirty-first resistor R31. The other end of the thirty-first resistor R31 is electrically connected to one end of the thirtieth resistor R30. The other end of the thirtieth resistor R30 is respectively electrically connected to one end of the twenty-eighth resistor R28, one end of the twenty-ninth resistor R29, and one end of the thirteenth capacitor C13. The THR pin of the second voltage-frequency converter U3 is respectively electrically connected to the other end of the twenty-ninth resistor R29, the other end of the thirteenth capacitor C13, and the IOUT pin of the second voltage-frequency converter U3. The COMP IN pin of the second voltage-frequency converter U3 is electrically connected to the domestic hot water control operational amplifier circuit. The VS pin of the second voltage-frequency converter U3 is electrically connected to one end of the fourteenth capacitor C14. The other end of the fourteenth capacitor C14 is respectively electrically connected to the domestic hot water control operational amplifier circuit, the GND pin of the second voltage-frequency converter U3, and one end of the twelfth capacitor C12. The RC pin of the second voltage-frequency converter U3 is respectively electrically connected to the other end of the twelfth capacitor C12 and one end of the twenty-sixth resistor R26. The other end of the twenty-sixth resistor R26 is electrically connected to one end of the twenty-third resistor R23. The other end of the twenty-third resistor R23 is respectively electrically connected to one end of the twenty-fourth resistor R24, one end of the twenty-seventh resistor R27, the trigger circuit, and the blower precision voltage-frequency conversion circuit. The other end of the twenty-seventh resistor R27 is electrically connected to the other end of the twenty-eighth resistor R28. The other end of the twenty-fourth resistor R24 is respectively electrically connected to one end of the twenty-fifth resistor R25 and the FREQ OUT pin of the second voltage-frequency converter U3. The other end of the twenty-fifth resistor R25 is electrically connected to the trigger circuit.

7. The boiler fan and domestic hot water simulation device according to claim 1, characterized in that: The domestic hot water control operational amplifier circuit includes a second operational amplifier U2B, a fifteenth capacitor C15, a thirty-second resistor R32, a thirty-third resistor R33, and a first jumper J11. The 7-pin of the second operational amplifier U2B is respectively electrically connected to the 6-pin of the second operational amplifier U2B and one end of the thirty-second resistor R32. The other end of the thirty-second resistor R32 is respectively electrically connected to the domestic hot water precision voltage-frequency conversion circuit and one end of the fifteenth capacitor C15. The other end of the fifteenth capacitor C15 is respectively electrically connected to the domestic hot water precision voltage-frequency conversion circuit, one end of the first jumper J11, and the domestic hot water flow feedback circuit. The other end of the first jumper J11 is electrically connected to one end of the thirty-third resistor R33. The other end of the thirty-third resistor R33 is electrically connected to the 5-pin of the second operational amplifier U2B.

8. The boiler fan and domestic hot water simulation device according to claim 1, characterized in that: The domestic hot water flow feedback circuit includes a second connector J2, a second NPN-type triode Q2, a sixteenth capacitor C16, a thirty-fifth resistor R35, a thirty-sixth resistor R36, a thirty-seventh resistor R37, and a second jumper J13. The DHWTACHO pin of the second connector J2 is electrically connected to one end of the second jumper J13 and the collector of the second NPN transistor Q2. The other end of the second jumper J13 is electrically connected to one end of the thirty-seventh resistor R37. The other end of the thirty-seventh resistor R37 is electrically connected to one end of the sixteenth capacitor C16. The other end of the sixteenth capacitor C16 is electrically connected to the emitter of the second NPN transistor Q2, one end of the thirty-sixth resistor R36, and the domestic hot water control operational amplifier circuit. The other end of the thirty-sixth resistor R36 is electrically connected to one end of the thirty-fifth resistor R35 and the base of the second NPN transistor Q2. The other end of the thirty-fifth resistor R35 is electrically connected to the trigger circuit.

9. The boiler fan and domestic hot water simulation device according to claim 1, characterized in that: The fan speed feedback circuit includes a first NPN transistor Q1, a seventeenth capacitor C17, a thirty-eighth resistor R38, a thirty-ninth resistor R39, a fortieth resistor R40, and a third jumper J15. The base of the first NPN transistor Q1 is electrically connected to one end of the thirty-eighth resistor R38 and one end of the thirty-ninth resistor R39. The other end of the thirty-eighth resistor R38 is electrically connected to the trigger circuit. The other end of the thirty-ninth resistor R39 is electrically connected to the emitter of the first NPN transistor Q1 and one end of the seventeenth capacitor C17. The other end of the seventeenth capacitor C17 is electrically connected to one end of the fortieth resistor R40. The other end of the fortieth resistor R40 is electrically connected to one end of the third jumper J15. The other end of the third jumper J15 is connected to the collector of the first NPN transistor Q1.

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