Induced draft fan operation monitoring device for heat supply system

Abstract

The utility model provides an induced draft fan operation monitoring device for a heat supply system, which effectively solves the problem that the conventional heat supply system only monitors the power of an induced draft fan and cannot ensure the normal operation of the induced draft fan, so that the induced draft fan affects the negative effect of heat supply. The operation monitoring device further comprises a state monitoring unit, and the state monitoring unit obtains a temperature signal based on the temperature of the induced draft fan during operation, detects cracks of the guide shaft of the induced draft fan to obtain a crack signal, and obtains an early warning signal based on the temperature signal and the crack signal. And the state monitoring unit comprises a primary detection circuit and a secondary detection circuit, so that the heat supply effect is ensured, and the use of residents is ensured.

Description

Technical Field

[0001] The utility model relates to the field of heat supply monitoring, in particular to an induced draft fan operation monitoring device for a heat supply system. Background Art

[0002] Patent application No. 201320623457.9 provides a heating energy-saving system, which uses a set temperature collection system to collect the user's indoor temperature, and monitors and outputs the collected indoor temperature to a control center. The control center also receives the working data of the electrical equipment of the boiler system, and adjusts the working time of the boiler system including the induced draft fan according to the power of each electrical equipment of the boiler system and the coal consumption of the boiler system, thereby achieving a better heating energy-saving effect.

[0003] Although the working time of the induced draft fan is adjusted based on its power and coal consumption, if the temperature in the user's room does not rise, the electrical equipment will need to be used for a long time, which may easily cause the induced draft fan to operate in a high temperature environment. However, the induced draft fan will be subject to high temperature and long-term friction, and the guide shaft may break, causing the induced draft fan to be inflexible or unable to operate normally, thereby affecting the heating effect and the residents' use.

[0004] That is, the existing heating system only monitors the power of the induced draft fan, but lacks monitoring of the guide shaft in the induced draft fan which often fails. In addition, the high temperature caused by long-term use causes the induced draft fan to affect the heating, which in turn affects the residents' use.

[0005] Therefore, the utility model provides a new solution to solve this problem. Summary of the invention

[0006] In view of the deficiencies in the prior art, the purpose of the utility model is to provide an induced draft fan operation monitoring device for a heating system, which effectively solves the problem that the existing heating system only monitors the power of the induced draft fan and cannot ensure the normal operation of the induced draft fan, resulting in the adverse consequence that the induced draft fan affects the heating.

[0007] The technical solution is an induced draft fan operation monitoring device for a heating system, comprising an induced draft fan and a control center, wherein the operation monitoring device further comprises a state monitoring unit, wherein the state monitoring unit obtains a temperature signal based on the temperature of the induced draft fan during operation and detects cracks on a guide shaft of the induced draft fan to obtain a crack signal, obtains an early warning signal based on the temperature signal and the crack signal, and outputs the early warning signal to the control center;

[0008] The state monitoring unit includes a primary detection circuit and a secondary detection circuit.

[0009] Furthermore, the primary detection circuit obtains a temperature signal based on the temperature sensor detecting the temperature of the induced draft fan during operation, obtains a change signal based on the temperature signal, and starts the secondary detection circuit while obtaining a first signal based on the change signal.

[0010] Furthermore, the primary detection circuit performs a subtraction operation based on the temperature signal to obtain a change signal.

[0011] Furthermore, the primary detection circuit performs an addition operation based on the change signal to obtain a first signal, and the first signal is output to the secondary detection circuit.

[0012] Furthermore, the secondary detection circuit detects cracks on the guide shaft of the induced draft fan to obtain a crack signal, obtains a second signal based on the crack signal, and obtains an early warning signal based on the first signal and the second signal.

[0013] Furthermore, the secondary detection circuit obtains the early warning signal by performing an OR operation on the first signal and the second signal.

[0014] The utility model achieves the following beneficial effects:

[0015] The present application provides a status monitoring unit for the induced draft fan, obtains a temperature signal based on the temperature of the induced draft fan during operation, detects cracks on the guide shaft of the induced draft fan to obtain a crack signal, and obtains an early warning signal based on the temperature signal and the crack signal. The status monitoring unit includes a primary detection circuit and a secondary detection circuit, which perform status monitoring for the operation of the induced draft fan, solving the problem that the existing heating system only monitors the power of the induced draft fan and cannot ensure the normal operation of the induced draft fan, resulting in the adverse consequence that the induced draft fan affects the heating, thereby ensuring the heating effect and ensuring the use of the residents. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of the framework of the utility model.

[0017] Figure 2 It is the principle diagram of the primary detection circuit of the utility model.

[0018] Figure 3 It is the principle diagram of the secondary detection circuit of the utility model. DETAILED DESCRIPTION

[0019] For the above and other technical contents, features and functions of the present invention, please refer to the following attached Figure 1-3 The detailed description of the embodiments will clearly show that the structural contents mentioned in the following embodiments are all based on the drawings in the specification.

[0020] Various exemplary embodiments of the present utility model will be described below with reference to the accompanying drawings.

[0021] An induced draft fan operation monitoring device for a heating system, comprising an induced draft fan and a control center, the operation monitoring device further comprising a state monitoring unit, the state monitoring unit obtaining a temperature signal based on the temperature of the induced draft fan during operation and detecting cracks of a guide shaft of the induced draft fan to obtain a crack signal, obtaining an early warning signal based on the temperature signal and the crack signal, and outputting the early warning signal to the control center;

[0022] The state monitoring unit includes a primary detection circuit and a secondary detection circuit.

[0023] The primary detection circuit uses the temperature sensor U1 to detect the temperature of the induced draft fan during operation to obtain a temperature signal. The temperature sensor U1 can be an infrared temperature sensor of the OS130A series. The obtained temperature signal is output to the operational amplifier U2A through the resistor R3. The operational amplifier U2A subtracts the collected temperature signal from the temperature threshold signal provided by the resistor R4 to obtain a change signal. This change signal is the temperature value of the induced draft fan exceeding the threshold. When the change signal turns on the diode D4, it indicates that the induced draft fan is in a high temperature state during operation. The obtained change signal is transmitted to the capacitor C1 through the 2nd and 3rd pins of the switch S1. The capacitor C1 stores the change signal. At the same time, the changing signal turns on the relay K1 at the same time as the in-phase end of the operational amplifier U3A. The relay K1 disconnects the 2nd pin of the switch S1 from the 3rd pin and connects it to the 1st pin. The temperature sensor collects the temperature of the induced draft fan at a fixed frequency, such as every 1 hour or 2 hours. Therefore, if the operational amplifier obtains the changing signal again during the next collection, the changing signal is directly output to the in-phase end of the operational amplifier U3A. The operational amplifier U3A adds the two changing signals. When the operational amplifier U3A turns on the transistor Q3, it indicates that the induced draft fan is in a high temperature state at both the previous and next moments. The transistor Q3 outputs the first signal through the diode D1. The first signal outputs the secondary detection circuit.

[0024] The primary detection circuit includes an operational amplifier U2A, the in-phase end of the operational amplifier U2A is respectively connected to one end of the resistor R3 and one end of the resistor R7, the other end of the resistor R3 is connected to the out pin of the temperature sensor U1, the inverting end of the operational amplifier U2A is respectively connected to one end of the resistor R1 and one end of the resistor R4, the output end of the operational amplifier U2A is respectively connected to the other end of the resistor R1 and the positive electrode of the diode D4, the negative electrode of the diode D4 is respectively connected to one end of the capacitor C2 and the 2nd pin of the switch S1, the 3rd pin of the switch S1 is respectively connected to one end of the capacitor C1, the other end of the capacitor C1 is respectively connected to one end of the resistor R5, one end of the relay K1, the in-phase end of the operational amplifier U3A, and the 2 pins, the inverting end of the operational amplifier U3A is respectively connected to one end of the resistor R8 and one end of the resistor R2, the other end of the resistor R2 is respectively connected to the output end of the operational amplifier U3A, the base of the transistor Q3, and one end of the resistor R13, the collector of the transistor Q3 is respectively connected to the positive electrode of the diode D1, the other end of the resistor R13, the other end of the resistor R4, the vcc pin of the temperature sensor U1 and the positive polarity power supply VCC, the emitter of the transistor Q3 is connected to one end of the resistor R9, the other end of the resistor R9 is respectively connected to the other end of the resistor R5, the other end of the capacitor C2, the other end of the relay K1, the other end of the resistor R7, the gnd pin of the temperature sensor U1 and the ground.

[0025] When the primary detection circuit obtains a change signal, the secondary detection circuit turns on the thyristor Q2 through the diode D4 and the capacitor C2. After the thyristor Q2 is turned on, the crack signal of the guide shaft detected by the ultrasonic sensor U2 is transmitted to the operational amplifier U1A through the resistor R11, wherein the ultrasonic sensor U2 can be an ultrasonic sensor of a model similar to T30UINA. Nondestructive testing by ultrasonic sensors is a mature prior art and will not be elaborated here. In order to avoid the crack being too small and causing the crack signal to be too weak, the operational amplifier U1A amplifies the crack signal, and the amplified crack signal is transmitted to the OR circuit composed of the diode D4, the diode D1, and the resistor R10. At the same time, the OR circuit also receives the first signal output by the primary detection circuit. When the crack signal or the first signal exists at the same time, the OR circuit performs an OR operation based on the two signals to output a warning signal to the control center, reminding that the guide shaft of the induced draft fan needs to be replaced or the induced draft fan needs to be cooled, thereby ensuring the normal operation of the induced draft fan.

[0026] The secondary detection circuit includes a thyristor Q2, the control electrode of the thyristor Q2 is connected to the negative electrode of the diode D4 in the primary detection circuit and one end of the capacitor C2, the anode of the thyristor Q2 is connected to the out pin of the ultrasonic sensor U2, the vcc pin of the ultrasonic sensor U2 is connected to the other end of the resistor R4 in the primary detection circuit and connected to the positive polarity power supply VCC, the cathode of the thyristor Q2 is connected to one end of the resistor R11, the other end of the resistor R11 is connected to the in-phase end of the operational amplifier U1A, and the operational amplifier U1A is connected to the positive polarity power supply VCC. The inverting end is respectively connected to one end of resistor R6 and one end of resistor R13. The other end of resistor R12 is connected to the output end of op amp U3A and the positive electrode of diode D2. The negative electrode of diode D2 is respectively connected to one end of resistor R10, the positive electrode of diode D5, and the negative electrode of diode D1 in the primary detection circuit. The negative electrode of diode D5 is connected to the control center. The other end of resistor R10 is respectively connected to the other end of resistor R6, the gnd pin of ultrasonic sensor U2, the other end of resistor R9 in the primary detection circuit and connected to the ground.

[0027] For example, in actual use, the temperature signal detected by the primary detection circuit is 3.8V, and a 0.8V change signal is obtained by subtracting the 3V temperature threshold signal provided by the operational amplifier U2A and the resistor R4. The change signal is then output to the operational amplifier U3A via the switch S1 and the capacitor C1. At the same time, the secondary detection circuit is turned on, and after obtaining a 0.9V change signal again, the transistor Q3 outputs the first signal via the diode D1. At this time, the secondary detection circuit outputs a 0.02V crack signal, and the crack signal is amplified to 2V via the operational amplifier U1A. The OR circuit composed of the diode D4, the diode D1, and the resistor R10 outputs a warning signal to the control center based on the crack signal and the first signal.

[0028] When the utility model is in use, the operation monitoring device also includes a state monitoring unit, and the state monitoring unit includes a primary detection circuit and a secondary detection circuit. The primary detection circuit uses a temperature sensor U1 to detect the temperature of the induced draft fan during operation to obtain a temperature signal, and the temperature signal is output to the operational amplifier U2A via a resistor R3. The operational amplifier U2A performs a subtraction operation on the collected temperature signal and the temperature threshold signal provided by the resistor R4 to obtain a change signal. When the change signal turns on the diode D4, the obtained change signal is transmitted to the capacitor C1 via the pins 2 and 3 of the switch S1. The capacitor C1 stores the change signal on the in-phase end of the operational amplifier U3A. At the same time, the change signal turns on the relay K1, and the relay K1 disconnects the pin 2 of the switch S1 from the pin 3 and connects it to the pin 1. The change signal is directly output to the in-phase end of the operational amplifier U3A. The amplifier U3A adds the two changed signals. When the operational amplifier U3A turns on the transistor Q3, the transistor Q3 outputs the first signal through the diode D1. The first signal outputs the secondary detection circuit. After the thyristor Q2 of the secondary detection circuit is turned on, the crack signal of the guide shaft detected by the ultrasonic sensor U2 is transmitted to the operational amplifier U1A through the resistor R11. In order to avoid the crack being too small and causing the crack signal to be too weak, the operational amplifier U1A amplifies the crack signal, and the amplified crack signal is transmitted to the OR circuit composed of the diode D4, the diode D1, and the resistor R10. At the same time, the OR circuit also receives the first signal output by the primary detection circuit. When the crack signal or the first signal exists at the same time, the OR circuit performs an OR operation based on the two signals and outputs a warning signal to the control center, reminding that the guide shaft of the induced draft fan needs to be replaced, or the induced draft fan needs to be cooled, thereby ensuring the normal operation of the induced draft fan.

[0029] The utility model achieves the following beneficial effects:

[0030] (1) The present application provides a status monitoring unit for the induced draft fan, obtains a temperature signal based on the temperature of the induced draft fan during operation, detects cracks on the guide shaft of the induced draft fan to obtain a crack signal, and obtains an early warning signal based on the temperature signal and the crack signal. The status monitoring unit includes a primary detection circuit and a secondary detection circuit, which monitor the status of the induced draft fan, thereby solving the problem that the existing heating system only monitors the power of the induced draft fan and cannot ensure the normal operation of the induced draft fan, resulting in the adverse consequence that the induced draft fan affects the heating, thereby ensuring the heating effect and ensuring the use of the residents.

[0031] (2) The primary detection circuit of the state monitoring unit provided in the present application monitors the temperature of the induced draft fan during operation, and obtains a change signal by performing a subtraction operation based on the operational amplifier U2A, and obtains a first signal by performing an addition operation on the change signals at the previous and next moments based on the operational amplifier U3A, thereby determining whether the induced draft fan has been in a high temperature state for a long time, thereby avoiding the problem that the induced draft fan occasionally exceeds the threshold and causes the induced draft fan to shut down, thereby affecting the heating of the heating system;

[0032] (3) The secondary detection circuit of the status monitoring unit provided in the present application is activated upon receiving a change signal, thereby determining whether the operation of the induced draft fan at high temperature has caused changes in the parts inside the induced draft fan. After receiving the crack signal, the circuit is amplified by the operational amplifier U1A, and the OR circuit composed of the diode D4, the diode D1, and the resistor R10 outputs a warning signal to the control center based on the crack signal and the first signal, thereby reminding the control center to process the induced draft fan, thereby ensuring the normal operation of the induced draft fan, and further ensuring the normal operation of the heating system.

Claims

1. An induced draft fan operation monitoring device for a heating system, comprising an induced draft fan and a control center, characterized in that: The operation monitoring device further comprises a state monitoring unit, wherein the state monitoring unit obtains a temperature signal based on the temperature of the induced draft fan during operation and detects cracks on the guide shaft of the induced draft fan to obtain a crack signal, obtains an early warning signal based on the temperature signal and the crack signal, and outputs the early warning signal to a control center; The state monitoring unit includes a primary detection circuit and a secondary detection circuit; The primary detection circuit includes an operational amplifier U2A, the in-phase end of the operational amplifier U2A is respectively connected to one end of the resistor R3 and one end of the resistor R7, the other end of the resistor R3 is connected to the out pin of the temperature sensor U1, the inverting end of the operational amplifier U2A is respectively connected to one end of the resistor R1 and one end of the resistor R4, the output end of the operational amplifier U2A is respectively connected to the other end of the resistor R1 and the positive electrode of the diode D4, the negative electrode of the diode D4 is respectively connected to one end of the capacitor C2 and the 2nd pin of the switch S1, the 3rd pin of the switch S1 is respectively connected to one end of the capacitor C1, the other end of the capacitor C1 is respectively connected to one end of the resistor R5, one end of the relay K1, the in-phase end of the operational amplifier U3A, and the 2 pins, the inverting end of the operational amplifier U3A is respectively connected to one end of the resistor R8 and one end of the resistor R2, the other end of the resistor R2 is respectively connected to the output end of the operational amplifier U3A, the base of the transistor Q3, and one end of the resistor R13, the collector of the transistor Q3 is respectively connected to the positive electrode of the diode D1, the other end of the resistor R13, the other end of the resistor R4, the vcc pin of the temperature sensor U1 and the positive polarity power supply VCC, the emitter of the transistor Q3 is connected to one end of the resistor R9, the other end of the resistor R9 is respectively connected to the other end of the resistor R5, the other end of the capacitor C2, the other end of the relay K1, the other end of the resistor R7, the gnd pin of the temperature sensor U1 and the ground; The secondary detection circuit includes a thyristor Q2, the control electrode of the thyristor Q2 is connected to the negative electrode of the diode D4 in the primary detection circuit and one end of the capacitor C2, the anode of the thyristor Q2 is connected to the out pin of the ultrasonic sensor U2, the vcc pin of the ultrasonic sensor U2 is connected to the other end of the resistor R4 in the primary detection circuit and connected to the positive polarity power supply VCC, the cathode of the thyristor Q2 is connected to one end of the resistor R11, the other end of the resistor R11 is connected to the in-phase end of the operational amplifier U1A, and the operational amplifier U1A is connected to the positive polarity power supply VCC. The inverting end is respectively connected to one end of resistor R6 and one end of resistor R13. The other end of resistor R12 is connected to the output end of op amp U3A and the positive electrode of diode D2. The negative electrode of diode D2 is respectively connected to one end of resistor R10, the positive electrode of diode D5, and the negative electrode of diode D1 in the primary detection circuit. The negative electrode of diode D5 is connected to the control center. The other end of resistor R10 is respectively connected to the other end of resistor R6, the gnd pin of ultrasonic sensor U2, the other end of resistor R9 in the primary detection circuit and connected to the ground.

2. The induced draft fan operation monitoring device for a heating system according to claim 1, characterized in that: The primary detection circuit obtains a temperature signal based on the temperature sensor detecting the temperature of the induced draft fan during operation, obtains a change signal based on the temperature signal, and starts the secondary detection circuit while obtaining a first signal based on the change signal.

3. The induced draft fan operation monitoring device for a heating system according to claim 2, characterized in that: The primary detection circuit performs a subtraction operation based on the temperature signal to obtain a change signal.

4. The induced draft fan operation monitoring device for a heating system according to claim 2, characterized in that: The primary detection circuit performs an addition operation based on the change signal to obtain a first signal, and the first signal is output to the secondary detection circuit.

5. The induced draft fan operation monitoring device for a heating system according to claim 1, characterized in that: The secondary detection circuit detects cracks in the guide shaft of the induced draft fan based on the ultrasonic sensor U2 to obtain a crack signal, obtains a second signal based on the crack signal, and obtains an early warning signal based on the first signal and the second signal.

6. The induced draft fan operation monitoring device for a heating system according to claim 5, characterized in that: The secondary detection circuit performs an OR operation on the first signal and the second signal to obtain an early warning signal.

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