Flexible pump stopping device for abnormal power failure of long-distance heat supply relay pump station

Abstract

The utility model provides a flexible pump stopping device for abnormal power failure of a long-distance heat supply relay pump station, and effectively solves the problem that the operation of a relay pump is influenced as a monitoring center cannot generate an effective flexible pump stopping strategy in time due to environmental influence. The flexible pump stopping device comprises pump stopping monitoring modules, and each relay pump in the relay pump station is provided with the corresponding pump stopping monitoring module. The pump stop monitoring module detects the pressure in a pump outlet connected with the relay pump or a pipe network branch to obtain a pressure signal, outputs a first reminding signal based on the pressure signal, and starts the storage battery to supply power to the relay pump; and the detection module is used for detecting a discharge current signal when the storage battery supplies power to obtain a discharge current signal, obtaining a second reminding signal based on the discharge current signal, and outputting the first reminding signal and the second reminding signal to a monitoring center.

Description

Technical Field

[0001] This utility model relates to the field of long-distance heating technology, and in particular to a flexible pump shutdown device for abnormal power outages in long-distance heating relay pump stations. Background Technology

[0002] Long-distance heating systems, due to their long pipeline distances and high-temperature transported media, require extremely high hydraulic stability. As core facilities for maintaining pipeline pressure balance, relay pump stations are susceptible to problems such as water hammer, pressure fluctuations, and equipment damage if a power outage occurs, as traditional rigid pump shutdown methods are prone to do so. Therefore, flexible pump shutdown technology is needed to achieve a "soft landing" for relay pumps after a power outage, ensuring system safety. The core of flexible pump shutdown is to achieve a gradual decrease in pump speed after a power outage through energy buffering, intelligent control, and equipment linkage, avoiding sudden pressure changes. For example, the sequential pump shutdown control system provided in Chinese utility model patent application number 201620191206.1 also achieves a flexible pump shutdown effect.

[0003] However, in actual operation, there are many technologies that use energy storage devices to assist relay pumps in achieving flexible pump shutdown. The energy storage device releases energy at the moment of power failure to maintain short-term pump operation, providing response time for long-distance heating networks. However, this flexible pump shutdown technology is still under development and is easily affected by other factors, preventing it from playing a significant role. For example, existing flexible pump shutdown strategies are generally generated by the monitoring center based on a pre-set model. However, the pressure and flow data of the monitored pipelines may not be transmitted to the monitoring center in a timely manner due to environmental factors, resulting in the monitoring center's inability to generate an effective flexible pump shutdown strategy in a timely manner, thus affecting the operation of the relay pumps.

[0004] Therefore, this utility model provides a new solution to this problem. Utility Model Content

[0005] To address the problems existing in the prior art, the purpose of this utility model is to provide a flexible pump shutdown device for abnormal power outages in long-distance heating relay pump stations. This flexible pump shutdown device for abnormal power outages in long-distance heating relay pump stations effectively solves the problem that the monitoring center cannot generate a timely and effective flexible pump shutdown strategy due to environmental influences, which affects the operation of the relay pumps.

[0006] The technical solution is a flexible pump shutdown device for abnormal power outages in long-distance heating relay pump stations. The flexible pump shutdown device communicates wirelessly with the monitoring center and is electrically connected to the battery and the relay pump. The flexible pump shutdown device includes a pump shutdown monitoring module, and each relay pump in the relay pump station has a corresponding pump shutdown monitoring module.

[0007] The pump stop monitoring module detects the pressure at the pump outlet or pipeline branch connected to the relay pump to obtain a pressure signal, outputs a first reminder signal based on the pressure signal, starts the battery to supply power to the relay pump, detects the discharge current signal when the battery supplies power to obtain a discharge current signal, obtains a second reminder signal based on the discharge current signal, and outputs the first reminder signal and the second reminder signal to the monitoring center.

[0008] The pump shutdown monitoring module includes a pressure monitoring unit and a power supply monitoring unit;

[0009] The pressure monitoring unit is connected to the power supply monitoring unit of the monitoring center, and the power supply monitoring unit is also connected to the monitoring center.

[0010] Furthermore, the pressure monitoring unit obtains a change signal based on the pressure signal, and obtains a calculation signal based on the pressure signal, and obtains a first reminder signal based on the calculation signal.

[0011] Furthermore, the pressure monitoring unit performs a subtraction operation based on the pressure signal to obtain the change signal.

[0012] Furthermore, the pressure monitoring unit performs a division operation based on the changing signal to obtain the calculated signal.

[0013] Furthermore, the pressure monitoring unit activates the oscillator to generate a first alert signal based on the calculation signal, and simultaneously controls the battery to supply power to the relay pump based on the first alert signal.

[0014] Furthermore, the power supply monitoring unit performs integration processing on the discharge current signal to obtain a power signal, and obtains the second reminder signal based on the power signal.

[0015] Furthermore, the power supply monitoring unit subtracts from the power signal and then outputs the second reminder signal.

[0016] This utility model achieves the following beneficial effects:

[0017] This application provides a pump stop monitoring module for each relay pump in the relay pumping station of the long-distance heating network. The pump stop monitoring module detects the pressure at the pump outlet or pipeline branch connected to the relay pump to obtain a pressure signal. Based on the pressure signal, it outputs a first reminder signal and starts the battery to supply power to the relay pump. It also detects the discharge current signal when the battery supplies power to obtain a discharge current signal and generates a second reminder signal based on the discharge current signal. The first and second reminder signals are then output to the monitoring center. This achieves a short-term flexible pump stop technology based on the battery, effectively solving the problem that the monitoring center cannot generate a timely and effective flexible pump stop strategy due to environmental factors, which affects the operation of the relay pump and ensures the safety of equipment in the long-distance heating network. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the relay pump station of this utility model.

[0019] Figure 2 This is a schematic diagram of the pump stop monitoring module of this utility model.

[0020] Figure 3 This is a circuit diagram of the pump stop monitoring module of this utility model. Detailed Implementation

[0021] For the purposes of this utility model, the foregoing and other technical contents, features and effects are described in conjunction with the appendix below. Figure 1-3 The detailed description of the embodiments will make this clear. All structural details mentioned in the following embodiments are based on the accompanying drawings.

[0022] Exemplary embodiments of the present invention will now be described with reference to the accompanying drawings.

[0023] A flexible pump shutdown device for abnormal power outages in long-distance heating relay pump stations, wherein the flexible pump shutdown device communicates wirelessly with a monitoring center and is electrically connected to a battery and a relay pump, characterized in that the flexible pump shutdown device includes a pump shutdown monitoring module, and each relay pump in the relay pump station is equipped with a corresponding pump shutdown monitoring module.

[0024] The pump stop monitoring module detects the pressure at the pump outlet or pipeline branch connected to the relay pump to obtain a pressure signal, outputs a first reminder signal based on the pressure signal, starts the battery to supply power to the relay pump, detects the discharge current signal when the battery supplies power to obtain a discharge current signal, obtains a second reminder signal based on the discharge current signal, and outputs the first reminder signal and the second reminder signal to the monitoring center.

[0025] The pump shutdown monitoring module includes a pressure monitoring unit and a power supply monitoring unit;

[0026] The pressure monitoring unit is connected to the power supply monitoring unit of the monitoring center, and the power supply monitoring unit is also connected to the monitoring center.

[0027] The pressure monitoring unit receives pressure signals detected by pressure sensors installed at the pump outlet or branch of the long-distance heating network connected to the relay pump. These pressure signals are then split into two paths via resistor R7 and output to operational amplifier U1A. One path is directly output to the inverting input of operational amplifier U1A, while the other path, after a delay via resistor R13 and capacitor C1, is output to the non-inverting input of operational amplifier U1A. The non-inverting input of operational amplifier U1A contains the pressure signal from the previous detection time. Operational amplifier U1A subtracts the two pressure signals to obtain the pressure change signal between the two detection times. This pressure signal and the change signal are then output to a divider centered around operational amplifier U3A and multiplier V1. The divider divides the change signal and the pressure signal to obtain a calculated signal, which represents the ratio between the change signal and the pressure signal. When the divider turns on transistor Q2, it indicates a significant change between the pressure signal from the previous moment and the current moment. This means that a sudden drop or rise in pressure has occurred at the pump outlet or branch of the pipeline in the long-distance heating network connected to the relay pump. In this case, a flexible pump shutdown measure is required for the relay pump. At this time, transistor Q2 turns on relay K1, and the pin switches S1, S2, and S3 of relay K1 close simultaneously. After switch S1 closes, the battery supplies power to the relay pump, thereby enabling the battery to release energy at the moment the relay pump is de-energized, maintaining the pump group's short-term operation and providing response time for the monitoring center. Simultaneously, after switch S2 closes, the oscillator with transistor Q3, inductor L1, and capacitor C5 as its core starts and outputs the first reminder signal. The first reminder signal is output to the monitoring center, reminding that a flexible pump shutdown strategy needs to be generated, thereby ensuring the safety of the equipment in the long-distance heating network.

[0028] The pressure monitoring unit includes a resistor R7. One end of resistor R7 is connected to a pressure sensor. The other end of resistor R7 is connected to one end of resistor R13, one end of resistor R12, one end of resistor R11, and the inverting input of operational amplifier U1A. The non-inverting input of operational amplifier U1A is connected to the other end of resistor R13, one end of capacitor C1, and one end of resistor R8. The output of operational amplifier U1A is connected to the other end of resistor R12 and one end of resistor R10. The other end of resistor R10 is connected to one end of resistor R15 and the inverting input of operational amplifier U3A. The non-inverting input of operational amplifier U3A is connected to one end of resistor R9. The other end of resistor R15 is connected to the output of multiplier V1. Pin 1 of multiplier V1 is connected to the other end of resistor R11. The output of operational amplifier U3A is connected to one end of resistor R2, the base of transistor Q2, and pin 2 of multiplier V1. The collector of the transistor is connected to one end of relay K1. The other end of relay K1 is connected to one end of switch S2 and the positive power supply VCC. The other end of switch S2 is connected to one end of resistor R18, one end of capacitor C5, and one end of inductor L1. The other end of inductor L1 is connected to one end of capacitor C3, the other end of capacitor C5, and the collector of transistor Q3. The base of transistor Q3 is connected to the other end of resistor R18, one end of capacitor C4, and one end of resistor R3. The other end of capacitor C4 is connected to the emitter of transistor Q3 and one end of resistor R17. The other end of capacitor C3 is connected to the monitoring center. The other end of resistor R17 is connected to the other end of resistor R3, the emitter of transistor Q2, the other end of resistor R9, the other end of resistor R8, and the other end of capacitor C1, and is connected to ground. One end of switch S1 is connected to the battery, and the other end of switch S1 is connected to the relay pump.

[0029] The power supply monitoring unit starts after switch S3 is closed. After switch S3 is closed, current sensor U1 starts to detect the discharge current signal of the battery supplying power to the relay pump. The current sensor can be a current sensor of similar model AHKC-EKBA. The battery charge signal is obtained by integrating the signal on the integrator with resistor R5, capacitor C6, and operational amplifier U2A as the core. The charge signal is then output to operational amplifier U4A in two paths. One path is directly output to the non-inverting input of operational amplifier U2A, and the other path is delayed by resistor R13 and capacitor C1 before being output to the inverting input of operational amplifier U2A. At the phase input, the detection frequency of the discharge current signal is relatively short, which can be 30s. The specific frequency can be set according to the actual situation. The power signals at two detection times can be obtained in a short time. The operational amplifier U2A subtracts the two power signals to obtain the power change signal. If the power change signal turns on the diode D1, it indicates that the battery power is decreasing rapidly. At this time, the diode D1 outputs a second reminder signal to the monitoring center, reminding the monitoring center to implement the model-generated flexible pump shutdown strategy. Otherwise, the battery discharge rate cannot support the long-term operation of the relay pump, so as to ensure the safety of the equipment in the long-distance heating network as much as possible.

[0030] The power supply monitoring unit includes a resistor R5. One end of resistor R5 is connected to the out pin of current sensor U1. The vcc pin of current sensor U1 is connected to one end of switch S3. The other end of switch S3 is connected to one end of switch S2 in the pressure monitoring unit, the other end of relay K1, and connected to the positive power supply VCC. The other end of resistor R5 is connected to one end of capacitor C6, one end of resistor R4, and the inverting input of operational amplifier U2A. The output of operational amplifier U2A is connected to the other end of capacitor C6, the other end of resistor R4, and one end of resistor R16. The other end of resistor R16... The terminals are connected to one end of resistor R14 and one end of resistor R1, respectively. The inverting terminal of op-amp U4A is connected to the other end of resistor R14, one end of capacitor C2, and one end of resistor R6, respectively. The other end of resistor R6 is connected to the positive terminal of diode D1 and the output terminal of op-amp U4A, respectively. The negative terminal of diode D1 is connected to the other end of capacitor C3 in the pressure monitoring unit and connected to the monitoring center, respectively. The other end of resistor R1 is connected to the other end of capacitor C2, the non-inverting terminal of op-amp U2A, the gnd pin of current sensor U1, and the other end of resistor R17 in the pressure monitoring unit and connected to ground, respectively.

[0031] In actual use, if the pressure signal detected by the pressure monitoring unit is 0.8V, while the pressure signal at the previous moment was 3V, the resulting change signal is 2.2V. The divider then divides the change signal by the pressure signal to obtain an operational signal of 2.7V. This operational signal turns on transistor Q2, which in turn turns on relay K1. This closes switches S1, S2, and S3, allowing the battery to start supplying power to the relay pump. The oscillator, with transistor Q3, inductor L1, and capacitor C5 as its core, starts and outputs a first alert signal. This first alert signal is sent to the monitoring center. The power supply monitoring unit starts after switch S3 is closed. The discharge current signal detected by current sensor U1 is 2.5V, resulting in a charge signal of 2V. The charge change signal obtained by subtraction by operational amplifier U2A is 0.3V. Therefore, the battery discharge rate is relatively low, and there is no need to output a second alert signal to the monitoring center.

[0032] In use, the flexible pump shutdown device includes a pump shutdown monitoring module, and each relay pump in the relay pumping station has a corresponding pump shutdown monitoring module. The pump shutdown monitoring module includes a pressure monitoring unit and a power supply monitoring unit. The pressure monitoring unit receives the pressure signal detected by the pressure sensor installed at the pump outlet or pipeline branch in the long-distance heat transmission network connected to the relay pump, and outputs the pressure signal to the operational amplifier U1A via resistor R7. The operational amplifier U1A subtracts the two pressure signals to obtain a change signal, and outputs the pressure signal and the change signal to the divider with the operational amplifier U3A and multiplier V1 as its core. The divider divides the change signal and the pressure signal to obtain a calculated signal. When the divider turns on transistor Q2, transistor Q2 turns on relay K1, and the pin switches S1, S2, and S3 of relay K1 close simultaneously. After switch S1 is closed, the battery supplies power to the relay pump, thereby realizing battery storage. The battery releases energy the instant the relay pump is de-energized to maintain the pump unit's short-term operation, providing response time for the monitoring center. Simultaneously, after switch S2 closes, the oscillator, composed of transistor Q3, inductor L1, and capacitor C5, starts and outputs a first alert signal. This first alert signal is sent to the monitoring center, reminding them to generate a flexible pump shutdown strategy to ensure the safety of equipment in the long-distance heating network. The power supply monitoring unit starts after switch S3 closes. Current sensor U1 begins to detect the discharge current signal of the battery supplying power to the relay pump and integrates it on an integrator composed of resistor R5, capacitor C6, and operational amplifier U2A to obtain the battery's charge signal. Operational amplifier U2A subtracts the two charge signals to obtain a charge change signal. If the charge change signal turns on diode D1, it indicates that the battery charge is decreasing rapidly. At this time, diode D1 outputs a second alert signal to the monitoring center, reminding them to execute a model-generated flexible pump shutdown strategy to ensure the safety of equipment in the long-distance heating network as much as possible.

[0033] This utility model achieves the following beneficial effects:

[0034] (1) This application sets up a pump stop monitoring module for each relay pump in the relay pumping station of the long-distance heat transmission network. The pump stop monitoring module detects the pressure in the pump outlet or pipeline branch connected to the relay pump to obtain a pressure signal, outputs a first reminder signal based on the pressure signal, starts the storage battery to supply power to the relay pump, detects the discharge current signal when the storage battery supplies power to obtain a discharge current signal, obtains a second reminder signal based on the discharge current signal, and outputs the first reminder signal and the second reminder signal to the monitoring center. Thus, the battery-based relay pump realizes a short-term flexible pump stop technology, effectively solving the problem that the monitoring center cannot generate a timely and effective flexible pump stop strategy due to environmental influences, which affects the operation of the relay pump and ensures the safety of equipment in the long-distance heat transmission network.

[0035] (2) The pressure monitoring unit in the pump stop monitoring module described in this application determines whether the pressure at the pump outlet or the branch of the pipeline in the long-distance heat transmission network connected to the relay pump has suddenly dropped or risen based on the operation amplifier U1A, operation amplifier U3A, and multiplier V1. The unit then outputs a first reminder signal to the monitoring center and simultaneously controls the battery to supply power to the relay pump, thereby ensuring the short-term operation of the relay pump.

[0036] (3) The power supply monitoring unit in the pump stop monitoring module described in this application integrates the discharge current signal based on the integrator with resistor R5, capacitor C6 and operational amplifier U2A to obtain the battery power signal, performs subtraction operation on the power signal based on operational amplifier U2A to obtain the power change signal, and determines the rate of power decrease based on diode D1, thereby determining the battery power supply time for the relay pump, and outputs a second reminder signal to the monitoring center, thereby reminding the monitoring center to quickly implement the corresponding flexible pump stop strategy to the relay pump, otherwise the discharge rate of the battery cannot supply the relay pump for a long time, thereby ensuring the safety of the equipment in the long-distance heating network as much as possible.

Claims

1. A flexible pump shutdown device for abnormal power outages in long-distance heating relay pump stations, wherein the flexible pump shutdown device communicates wirelessly with a monitoring center, and is electrically connected to a storage battery and a relay pump, characterized in that, The flexible pump shutdown device includes a pump shutdown monitoring module, and each relay pump in the relay pumping station is equipped with a corresponding pump shutdown monitoring module; The pump stop monitoring module detects the pressure at the pump outlet or pipeline branch connected to the relay pump to obtain a pressure signal, outputs a first reminder signal based on the pressure signal, starts the battery to supply power to the relay pump, detects the discharge current signal when the battery supplies power to obtain a discharge current signal, obtains a second reminder signal based on the discharge current signal, and outputs the first reminder signal and the second reminder signal to the monitoring center. The pump shutdown monitoring module includes a pressure monitoring unit and a power supply monitoring unit; The pressure monitoring unit is connected to the power supply monitoring unit of the monitoring center, and the power supply monitoring unit is also connected to the monitoring center.

2. The flexible pump shutdown device for abnormal power outages in long-distance heating relay pump stations as described in claim 1, characterized in that, The pressure monitoring unit obtains a change signal based on the pressure signal, and obtains a calculation signal based on the pressure signal, and obtains a first reminder signal based on the calculation signal.

3. The flexible pump shutdown device for abnormal power outages in long-distance heating relay pump stations as described in claim 2, characterized in that, The pressure monitoring unit performs a subtraction operation on the pressure signal to obtain the change signal.

4. The flexible pump shutdown device for abnormal power outages in long-distance heating relay pump stations as described in claim 2, characterized in that, The pressure monitoring unit performs a division operation based on the changing signal to obtain the calculated signal.

5. The flexible pump shutdown device for abnormal power outages in long-distance heating relay pump stations as described in claim 2, characterized in that, The pressure monitoring unit starts the oscillator to generate a first reminder signal based on the calculation signal, and at the same time controls the battery to supply power to the relay pump based on the first reminder signal.

6. The flexible pump shutdown device for abnormal power outages in long-distance heating relay pump stations as described in claim 1, characterized in that, The power supply monitoring unit performs integration processing on the discharge current signal to obtain a power signal, and obtains the second reminder signal based on the power signal.

7. The flexible pump shutdown device for abnormal power outages in long-distance heating relay pump stations as described in claim 6, characterized in that, The power supply monitoring unit subtracts from the power signal and then outputs the second reminder signal.

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