Water pump flow monitoring device of heat supply system

Abstract

The utility model provides a water pump flow monitoring device of a heat supply system, which effectively solves the problem that the normal operation of the heat supply system cannot be ensured due to the fact that the conventional heat supply system cannot judge whether the flow is normal or abnormal when the flow is changed. The monitoring device further comprises a flow monitoring unit, the flow monitoring unit detects the power of the fan and the power of the water pump based on the flow of the water pump and outputs a reminding signal to the intelligent controller, and the flow monitoring unit comprises a flow detection circuit and a reminding output circuit. And the flow detection circuit outputs a reminding signal to the intelligent controller, so that the heat supply effect of the user side is ensured.

Description

Technical Field

[0001] The utility model relates to the technical field of heating monitoring, in particular to a water pump flow monitoring device for a heating system. Background Art

[0002] The development of technology continuously drives the convenience of life. Although the heating temperature of the traditional heating system is adjustable, it is achieved by the amount of combustible materials burned. Now, the heating system can be realized by controlling the flow rate of the hot water provided to the user end, that is, by variable speed frequency modulation of the water pumps including the circulation water pump in the heating system, achieving the flexibility and effectiveness of temperature adjustment in the heating system. For example, the patent application number 202320847355.9 provides a heat pump unit with adjustable flow rate. Using the signals fed back by the temperature sensor and the pressure sensor, the intelligent controller automatically links the differential pressure transmitter and the flow sensor, enabling the heat pump unit to operate in matching with the flow rate of the terminal system.

[0003] The fan is also an important device in the heating system. It is a device that can blow air towards the heating pipeline, playing the role of conveying hot air into the pipeline. When using the method of variable flow rate adjustment to adjust the temperature of the heating system, the performance curves of the fan and the water pump cannot change, that is, the power of the fan and the water pump needs to remain unchanged. Otherwise, it will affect the adjustment effect of the flow rate of the water pump, and further affect the heating effect of the user end. If the flow rate of the water pump suddenly changes, it is impossible to ensure whether the flow rate change is caused by variable flow rate adjustment or abnormal reasons such as water pump failure, and it is impossible to ensure the normal operation of the heating system.

[0004] That is, the existing heating system has the problem that when the flow rate changes, it is impossible to judge whether it is caused by normal or abnormal reasons, and it is impossible to ensure the normal operation of the heating system.

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

[0006] Aiming at the deficiencies existing in the prior art, the purpose of the utility model is to provide a water pump flow monitoring device for a heating system, effectively solving the problem that the existing heating system has when the flow rate changes, it is impossible to judge whether it is caused by normal or abnormal reasons, and it is impossible to ensure the normal operation of the heating system.

[0007] The technical solution it adopts is that a water pump flow monitoring device for a heating system includes a water pump, a fan and an intelligent controller. The monitoring device further includes a flow monitoring unit. The flow monitoring unit detects the power of the fan and the water pump respectively based on the flow rate of the water pump, and outputs a reminder signal to the intelligent controller;

[0008] The flow monitoring unit includes a flow detection circuit and a reminder output circuit;

[0009] The flow detection circuit outputs a reminder signal to the intelligent controller.

[0010] Further, the flow detection circuit conducts the reminder output circuit through operation based on the flow signal obtained from the flow rate of the water pump.

[0011] Further, the flow detection circuit performs a subtraction operation on the flow signals at adjacent previous and current moments to obtain a difference signal, and conducts the reminder output circuit based on the difference signal.

[0012] Further, the reminder output circuit respectively detects the power of the fan and the water pump to obtain a first power signal and a second power signal, and controls the flow detection circuit to output a reminder signal to the intelligent controller based on the first power signal and the second power signal.

[0013] Further, the reminder output circuit respectively compares the first power signal and the second power signal to obtain a first comparison signal and a second comparison signal, obtains a control signal based on the first comparison signal and the second comparison signal, and controls the flow detection circuit to output a reminder signal based on the control signal.

[0014] Further, the reminder output circuit performs an OR operation on the first comparison signal and the second comparison signal to obtain a control signal.

[0015] The present utility model achieves the following beneficial effects:

[0016] The flow monitoring unit provided in this application detects the power of the fan and the water pump respectively based on the flow rate of the water pump, and outputs a reminder signal to the intelligent controller. By judging the operating power of the fan and the water pump when the flow rate of the water pump changes, it can be determined whether the change in the flow rate of the water pump is normal or abnormal, solving the problem that the existing heating system cannot determine whether it is caused by normal or abnormal reasons when the flow rate changes, and ensuring the normal operation of the heating system. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a framework schematic diagram of the present utility model.

[0018] Figure 2 It is a schematic diagram of the principle of the flow detection circuit of the present utility model.

[0019] Figure 3 It is a schematic diagram of the principle of the reminder output circuit of the present utility model. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0020] Regarding the foregoing and other technical contents, features and effects of the present utility model, in the following with reference to the attachedFigures 1-3 In the detailed description of the embodiments, it will be clearly presented. The structural contents mentioned in the following embodiments are all referenced to the accompanying drawings of the specification.

[0021] The exemplary embodiments of the present utility model will be described below with reference to the accompanying drawings.

[0022] A water pump flow monitoring device for a heating system, comprising a water pump, a fan and an intelligent controller. The monitoring device further comprises a flow monitoring unit, which detects the power of the fan and the water pump respectively based on the flow of the water pump and outputs a reminder signal to the intelligent controller;

[0023] The flow monitoring unit comprises a flow detection circuit and a reminder output circuit;

[0024] The flow detection circuit outputs a reminder signal to the intelligent controller.

[0025] The flow detection circuit transmits the flow signal of the water pump detected by the flow sensor through resistor R9 in two paths to operational amplifier U2A. One path is directly transmitted through resistor R9 to the non-inverting input terminal of operational amplifier U2A, and the other path is output to the inverting input terminal of operational amplifier U2A after being delayed by resistor R4 and capacitor C1. That is, the flow signal at the previous moment is at the inverting input terminal of operational amplifier U2A. Operational amplifier U2A performs a subtraction operation on the two flow signals to obtain a difference signal. The difference signal represents the flow change before and after the water pump. When the difference signal turns on triode Q3, it indicates that the difference between the previous and current moments of the water pump is relatively large. At this time, triode Q3 conducts the reminder output circuit through relay K1;

[0026] The flow detection circuit comprises resistor R9. One end of resistor R9 is connected to the flow sensor, and the other end of resistor R9 is respectively connected to one end of resistor R4, one end of resistor R7, and the non-inverting input terminal of operational amplifier U2A. The inverting input terminal of operational amplifier U2A is respectively connected to the other end of resistor R4, one end of capacitor C1, and one end of resistor R2. The inverting input terminal of operational amplifier U2A is respectively connected to the other end of resistor R2 and one end of resistor R1. The other end of resistor R1 is connected to the base of triode Q3. The collector of triode Q3 is respectively connected to one end of relay K1 and one end of switch S2. The other end of relay K1 is connected to the positive power supply VCC. The other end of switch S2 is connected to the positive pole of diode D3. The negative pole of diode D3 is connected to the intelligent controller. The emitter of triode Q3 is connected to one end of resistor R3. The other end of resistor R3 is respectively connected to the other end of resistor R7, the other end of capacitor C1 and connected to ground.

[0027] The reminder output circuit is turned on when the relay K1 in the flow detection circuit is turned on. At this time, the switch S1 is the pin switch of the relay K1. When the relay K1 is turned on, the 4-pin of the switch S1 is connected to the 3-pin, and at the same time, the 2-pin is connected to the 1-pin. Then the power sensors U1 and U2 are turned on to detect the operating power of the fan and the water pump respectively, and the first power signal and the second power signal are obtained respectively. Among them, the power sensors U1 and U2 can both use power sensors with a similar model of WB9128-1. The first power signal output by the power sensor U1 is transmitted to the operational amplifier U4A through the resistor R5 and compared with the operating power signal provided by the resistor R8. The operating power signal is the power signal of the fan during normal operation. The operational amplifier U4A outputs the first comparison signal to the OR gate circuit composed of the diode D1, the diode D2, and the resistor R10. The second power signal output by the power sensor U2 is output to the operational amplifier U3A through the resistor R6. The operational amplifier U3A compares the operating power signal provided by the resistor R11 with the second power signal. The operating power signal is the power signal of the water pump during normal operation. The operational amplifier U3A outputs the second comparison signal to the OR gate circuit composed of the diode D1, the diode D2, and the resistor R10. When the OR gate circuit turns on the relay K2, it indicates that the power of the fan or the water pump has changed at this time, or the powers of both have changed, which does not meet the basic requirements of the flow variable speed regulation method. Then the flow change of the water pump at this time is abnormal. Then the OR gate circuit outputs a control signal to turn on the relay K2. At this time, the relay K2 closes the switch S2 in the flow detection circuit. Then the triode Q3 outputs a reminder signal to the intelligent controller through the closed switch S2 and the diode D3, reminding that the flow change of the water pump is abnormal at this time;

[0028] The reminder includes a power sensor U1. The vcc pin of the power sensor U1 is connected to the 1-pin of the switch S1. The 2-pin of the switch S1 is respectively connected to the 4-pin of the switch S1, one end of the resistor R8, one end of the resistor R11, the other end of the relay K1 in the flow detection circuit, and is connected to the positive power supply VCC. The 3-pin of the switch S1 is connected to the vcc pin of the power sensor U2. The out of the power sensor U1 is connected to one end of the resistor R5. The other end of the resistor R5 is connected to the inverting input of the operational amplifier U4A. The non-inverting input of the operational amplifier U4A is connected to the other end of the resistor R8. The output of the operational amplifier U4A is connected to the positive electrode of the diode D1. The negative electrode of the diode D1 is respectively connected to the negative electrode of the diode D2, one end of the resistor R10, and one end of the relay K2. The positive electrode of the diode D2 is connected to the output of the operational amplifier U3A. The inverting input of the operational amplifier U3A is connected to one end of the resistor R6. The other end of the resistor R6 is connected to the out pin of the power sensor U2. The gnd pin of the power sensor U2 is respectively connected to the gnd pin of the power sensor U1, the other end of the resistor R10, the other end of the relay K2, the other end of the resistor R3 in the flow detection circuit, and is connected to the ground.

[0029] In actual use, if the flow signal collected by the flow detection circuit is 3.5V, and the flow signal after being delayed by the resistor R4 and the capacitor C1 is 1.5V, then the difference signal obtained by the operational amplifier U2A is 2V. At this time, the reminder output circuit is turned on. The first power signal collected by the reminder output circuit is 2.5V, the second power signal is 2.3V, the operating power signal is 3V, and the operating power signal is 2.8V. Then the first comparison signal and the second comparison signal turn on the OR gate circuit composed of the diode D1, the diode D2, and the resistor R10. Then the relay K1 makes the flow detection circuit output a reminder signal of 1V to the intelligent controller.

[0030] When the utility model is in use, the monitoring device further includes a flow monitoring unit. The flow monitoring unit includes a flow detection circuit and a reminder output circuit. The flow detection circuit transmits the flow signal of the water pump detected by the flow sensor in two paths through the resistor R9 to the operational amplifier U2A. The operational amplifier U2A performs a subtraction operation on the two flow signals to obtain a difference signal. When the difference signal turns on the triode Q3, the triode Q3 turns on the reminder output circuit through the relay K1. The reminder output circuit turns on when the relay K1 in the flow detection circuit turns on. The first power signal output by the power sensor U1 is transmitted to the operational amplifier U4A through the resistor R5 and compared with the operating power signal provided by the resistor R8. The operational amplifier U4A outputs a first comparison signal to the OR gate circuit composed of the diode D1, the diode D2, and the resistor R10. At the same time, the second power signal output by the power sensor U2 is output to the operational amplifier U3A through the resistor R6. The operational amplifier U3A compares the operating power signal provided by the resistor R11 with the second power signal. The operational amplifier U3A outputs a second comparison signal to the OR gate circuit composed of the diode D1, the diode D2, and the resistor R10. Then, the OR gate circuit outputs a control signal to turn on the relay K2. At this time, the relay K2 closes the switch S2 in the flow detection circuit. Then, the triode Q3 outputs a reminder signal to the intelligent controller through the closed switch S2 and the diode D3, reminding that there is an abnormality in the flow change of the water pump at this time.

[0031] The utility model realizes the following beneficial effects:

[0032] (1) The flow monitoring unit provided in this application detects the power of the fan and the water pump respectively based on the flow of the water pump and outputs a reminder signal to the intelligent controller. By judging the operating power of the fan and the water pump when the flow of the water pump changes, it is determined whether the change in the flow of the water pump is normal or abnormal, solving the problem that the existing heating system cannot determine whether it is caused by normal or abnormal reasons when the flow changes, and ensuring the normal operation of the heating system.

[0033] (2) The flow detection circuit provided in this application performs subtraction operation on the flow signal of the water pump based on the operational amplifier U2A, thereby judging that the flow of the water pump has changed greatly. At this time, the reminder output circuit is started to form timely monitoring, and a reminder signal is output to the intelligent controller under the control of the reminder output circuit, ensuring the operation of the heating system.

[0034] (3) The reminder output circuit provided in this application is started under the control of the flow detection circuit, detects the operating power of the fan and the water pump, makes comparisons respectively based on operational amplifier U4A and operational amplifier U3A, and controls the flow detection circuit to output a reminder signal to the intelligent controller under the operation of the OR gate circuit composed of diode D1, diode D2 and resistor R10, so as to judge whether the sudden flow change of the water pump is normal or abnormal, and solves the problems existing in the existing heating system.

Claims

1. A water pump flow monitoring device for a heating system, comprising a water pump, a fan and an intelligent controller, characterized in that, The monitoring device further includes a flow monitoring unit. The flow monitoring unit detects the power of the fan and the water pump respectively based on the flow rate of the water pump, and outputs a reminder signal to the intelligent controller; The flow monitoring unit includes a flow detection circuit and a reminder output circuit; The flow detection circuit outputs a reminder signal to the intelligent controller; The reminder output circuit detects the power of the fan and the water pump respectively to obtain a first power signal and a second power signal, and controls the flow detection circuit to output a reminder signal to the intelligent controller based on the first power signal and the second power signal; The reminder output circuit compares the first power signal and the second power signal respectively to obtain a first comparison signal and a second comparison signal, obtains a control signal based on the first comparison signal and the second comparison signal, and controls the flow detection circuit to output a reminder signal based on the control signal; The reminder includes a power sensor U1. The vcc pin of the power sensor U1 is connected to the 1 pin of the switch S1. The 2 pin of the switch S1 is respectively connected to the 4 pin of the switch S1, one end of the resistor R8, one end of the resistor R11, and the other end of the relay K1 in the flow detection circuit and is connected to the positive power supply VCC. The 3 pin of the switch S1 is connected to the vcc pin of the power sensor U2. The out of the power sensor U1 is connected to one end of the resistor R5. The other end of the resistor R5 is connected to the inverting end of the operational amplifier U4A. The non-inverting end of the operational amplifier U4A is connected to the other end of the resistor R8. The output end of the operational amplifier U4A is connected to the positive pole of the diode D1. The negative pole of the diode D1 is respectively connected to the negative pole of the diode D2, one end of the resistor R10, and one end of the relay K2. The positive pole of the diode D2 is connected to the output end of the operational amplifier U3A. The inverting end of the operational amplifier U3A is connected to one end of the resistor R6. The other end of the resistor R6 is connected to the out pin of the power sensor U2. The gnd pin of the power sensor U2 is respectively connected to the gnd pin of the power sensor U1, the other end of the resistor R10, the other end of the relay K2, and the other end of the resistor R3 in the flow detection circuit and is connected to the ground.

2. The water pump flow monitoring device of the heating system according to claim 1, characterized in that The flow detection circuit conducts an operation on the flow signal obtained based on the flow rate of the water pump to turn on the reminder output circuit.

3. The water pump flow monitoring device of the heating system according to claim 2, characterized in that, The flow detection circuit performs a subtraction operation on the flow signals at adjacent previous and current moments to obtain a difference signal, and turns on the reminder output circuit based on the difference signal.

4. The water pump flow monitoring device of the heating system according to claim 1, characterized in that, The reminder output circuit performs an OR operation on the first comparison signal and the second comparison signal to obtain a control signal.

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