Novel motor equipment emergency batch self-starting device

Abstract

The utility model relates to the technical field of motor control, in particular to a novel motor equipment emergency batch self-starting device, which comprises a signal acquisition module, an IO (Input / Output) module, a control module, a switch module, a display module and a UPS (Uninterrupted Power Supply), the IO module is used for providing electrical isolation between the control system and external interference; the control module is used for storing the bus voltage signal and the pump state signal, automatically starting the shut-down pumps in batches, and sending the working state information of the device to the display module; the switch module is used for starting and stopping the pump; and the UPS is used for supplying power to the core component of the self-starting device. According to the utility model, batch self-starting of multiple pumps after power sag recovery can be intelligently completed, the production efficiency is improved, and safety accidents are completely eradicated.

Description

Technical Field

[0001] The utility model relates to the technical field of motor control, and particularly to a novel emergency batch self-starting device for motor equipment. Background Art

[0002] The motor pumps in chemical enterprises are one of the key equipment in the process flow, responsible for transporting liquids, gases and other fluid media, which is crucial for ensuring the continuous and stable operation of chemical production processes. The working state of motor pumps directly affects the production efficiency, product quality and safety of chemical enterprises. Due to various power quality events such as short-term voltage loss, short-term large fluctuations or short-term power outage for several seconds caused by lightning strikes, ground short circuits, reclosing, equipment startup, power plant failures and other reasons in the power grid, these power quality events may cause the motor pumps to decrease in speed and affect the production process, and even result in unplanned shutdowns, paralyzing the entire production line. If the machine pumps are not restored in time, it will lead to energy consumption and serious safety accidents in severe cases. Therefore, it is necessary to restart the motor pumps in time according to the recovery situation of voltage fluctuations.

[0003] In the prior art, generally, manual restoration one by one or setting a low-voltage comprehensive protector at the low-voltage cabinet to achieve the low-voltage restart protection function is adopted. Both of these two methods have deficiencies:

[0004] After the voltage sags and fluctuates, the operators check and restore one by one. Due to the large number of machine pumps, the restoration operation takes a long time, seriously affecting the production efficiency and not meeting the actual needs of the production system;

[0005] The low-voltage comprehensive restart function automatically restarts after a certain delay after detecting an abnormal situation. There is a problem of dead zone in actual applications, which may lead to restart failure and cause trouble to the maintenance of safety production equipment. At the same time, if all the stopped machine pumps are restarted simultaneously, it may generate a large inrush current and affect the safe operation of the power distribution facilities. In addition, the low-voltage comprehensive protection device does not have relevant data records such as data detection, action time, restart signal number, etc., which is not conducive to equipment maintenance management. Therefore, it is necessary to develop an integrated device to complete the process of batch self-starting of motors, improve work efficiency and prevent safety accidents. Content of the Utility Model

[0006] The utility model provides a novel emergency batch self-starting device for motor equipment, which can realize the intelligent management of batch self-starting of motor equipment after abnormal voltage fluctuations, reduce the production operation frequency, prevent operation accidents and improve the intrinsic safety.

[0007] The present application provides the following technical solutions:

[0008] A new type of emergency batch self-starting device for motor equipment, including a signal acquisition module, an IO module, a control module, a switch module, a display module, and a UPS, where:

[0009] The signal acquisition module is electrically connected to the IO module and is used to collect bus voltage signals and pump status signals;

[0010] The IO module is also electrically connected to the switch module and the control module and is used to provide electrical isolation between the control system and external interference;

[0011] The control module is used to store bus voltage signals and pump status signals, complete the AD conversion of the collected signals, generate batch self-start signals, and send power failure information, pump status change information, and self-start records to the display module;

[0012] The switch module is used to close the contactors of the corresponding motors according to the batch self-start signals;

[0013] The display module is used to integrate power failure information, pump status change information, and self-start records and provide a display to the user;

[0014] The UPS is used to supply power to the signal acquisition module, the IO module, and the control module.

[0015] Technical principle: The batch self-starting device includes collecting bus voltage and pump status signals. The collected signals are judged by the control module according to a preset logic through the IO module, generating batch start instructions, and the switch unit receives the batch start instructions and completes the restart operation of the specific pump.

[0016] Beneficial effects: By detecting and processing instantaneous power failure, the dead zone problem of the cooperation between the contactor and the low-voltage comprehensive protector can be effectively avoided; using the IO module to isolate external signals from the control unit can ensure the stable operation of the control system; using the UPS to supply power to the core control part can avoid misoperation of the control system due to voltage fluctuations.

[0017] Further, the signal acquisition module includes a bus voltage unit and a pump status unit. The bus voltage unit is used to collect bus voltage signals, and the pump status unit is used to collect pump status signals and pump voltage signals.

[0018] Further, the bus voltage unit samples at intervals of 10 ms, and the pump status unit samples at intervals of 0.5 seconds.

[0019] Beneficial effects: The high sampling frequency of the bus voltage can achieve millisecond-level response. The pump status signal is used for secondary judgment after detecting bus voltage fluctuations, and the working state change of the pump is judged by the change of the sampling status before and after.

[0020] Further, the control module communicates with the host computer through the TCP protocol. The control module includes an execution subunit, a detection subunit, and a batch startup subunit. Among them, the execution subunit is used to complete TCP protocol control, establish communication with the host computer, and realize online monitoring of the execution of the control module; the detection subunit conducts online monitoring of the bus voltage signal; the batch startup subunit starts different batches of pump sets in batches according to the state of the bus voltage signal.

[0021] Beneficial effects: By adjusting the design of the control module, the soft adjustment of the control circuit can be completed, with simple debugging and low maintenance workload; the control module can judge the working state of each pump in real time and generate corresponding startup instructions, which can ensure the accuracy and rapid response during the restart process, and is conducive to operators quickly identifying malfunctioning pumps.

[0022] Further, the control module is also used to generate a switching instruction according to the pump state signal, and the switch module completes the main-backup switching of the pumps according to the switching instruction.

[0023] Beneficial effects: The control system can identify the working state of the pumps without voltage fluctuations and automatically complete the switching for malfunctioning pumps.

[0024] Further, the display module is also used to receive user instructions and send them to the control module. The control module generates a switching instruction according to the user instruction, and the switch module completes the switching between the main pump and the standby pump according to the switching instruction.

[0025] Beneficial effects: The control system can complete the main-backup switching of the pumps according to user instructions, which is convenient for operators to execute the maintenance plan. Description of the Drawings

[0026] Figure 1 It is a structural diagram of a new type of emergency batch self-starting device for motor equipment. Detailed Implementation Modes

[0027] Each section in the chemical industry system includes multiple pumps. The number and type of pumps in different sections vary according to specific production process flows and requirements. Due to the situation of "power flicker" in the power supply system, resulting in voltage fluctuations or short-term power outages within a short period, it may cause the abnormal operation or stop of the pump equipment, affecting production efficiency and even causing safety accidents.

[0028] After a "power swing" occurs, the pumps that need to be restarted after shutdown need to be restarted. Due to the large number of pumps and the high overall load, if all the shutdown pumps are started simultaneously, it may cause a serious impact on the power distribution equipment. Therefore, the present utility model provides a new type of emergency batch self-starting device for motor equipment, which starts different pumps that are shut down due to "power swing" in batches, and can effectively reduce the impact of the current during the motor startup process on the power distribution equipment, ensuring a stable and reliable self-starting process.

[0029] The following is a more detailed description through specific embodiments:

[0030] Embodiment 1

[0031] This embodiment provides a new type of emergency batch self-starting device for motor equipment, and its structure is as Figure 1 shown. The device includes a signal acquisition module, an IO module, a control module, a switch module, a display module, and a UPS, where:

[0032] The signal acquisition module is used to collect the bus voltage signal and the pump status signal, including a bus voltage unit and a pump status unit. The bus voltage unit is used to collect the bus voltage signal, and the pump status unit is used to collect the pump status and the pump voltage signal. In this example, the bus voltage unit is implemented by a voltage detection relay, and the sampling point of the voltage detection is set at the front end of the power distribution system to continuously collect the bus voltage data. The pump status unit uses a flow sensor and a voltage detection sensor to collect the actual working status signal of the pump. The outputs of the bus voltage unit and the pump status unit are electrically connected to the IO module.

[0033] The IO module is electrically connected to the signal acquisition module, the switch module, and the control module respectively, and is used to provide electrical isolation between the control system and external interference. In this embodiment, the analog output of the signal acquisition module is connected to the SM DR32 through an isolation relay and sent to the control module through the SM DR32.

[0034] The control module is used to store the bus voltage signal and the pump status signal, complete the AD conversion of the collected signals, generate batch self-start signals, and send the power-sag information, pump status change information, and self-start records to the display module. In this embodiment, the control module can be implemented by a PLC. Preferably, it is implemented by using Siemens S7-200 SAMRT PLC SR60 in cooperation with an analog module. The analog module receives the relay signals input by the IO module and completes the AD conversion. The control module communicates with the host computer through the TCP protocol and can implement functions such as automatic identification, judgment, execution, and alarm. The control module includes an execution subunit, a detection subunit, and a batch start subunit. Among them, the execution subunit is responsible for completing TCP protocol control, establishing communication with the host computer, realizing online monitoring of the execution of the control module, and completing human-computer interaction; the detection subunit scans and detects the bus voltage signal and the pump status, and performs cyclic online storage, and completes the AD conversion of the detection results of the bus voltage and the pump voltage; the batch start subunit generates a self-start instruction for the pump according to the changes in the bus voltage and the pump status data, and divides the pumps to be started into batches according to the preset importance of the process equipment and the equipment load data, and starts different batches of pump combinations in batches. The control module simultaneously tracks the execution of the batch start subunit and gives an audible and visual alarm for the motor with self-start failure.

[0035] The switch module is used to close the contactors of the corresponding motors according to the batch self-start signals, including output relays respectively connected to the start circuits of each pump. The other end of the output relay is connected to the SM DR32. When the start instruction of this pump output by the control module is valid, the contactor of this pump is turned on, and the pump is powered on and started.

[0036] The display module receives the power-sag information, pump status information, and self-start records sent by the control module, integrates the above information and provides a display to the user. In this embodiment, the display module can be implemented by using a touch screen, and in addition to displaying the integrated information to the user, it can also be used to receive user instructions.

[0037] The core components of the self-start device are powered by a UPS, including a signal acquisition module, an IO module, and a control module, which can ensure the reliability and stability of the system operation and are not affected by the fluctuation of the supply voltage.

[0038] In actual use, the batch self-start device forms a safe closed-loop control from data acquisition, intelligent analysis, command execution, and result feedback.

[0039] When the power supply system is normal, there is no voltage sag and flicker, and the pump status is recorded regularly once and stored in the PLC register, and the system runs in the monitoring state. When the bus voltage has flicker and sag, the detection subunit performs dynamic scanning at intervals of 10 ms, and can immediately sense the fluctuation state and time of the bus voltage.

[0040] When the bus voltage is detected to be < 370V and the bus voltage flashing time is ≤ 3s, the state changes of the sub-unit monitoring pumps are started batch by batch. If the state of the pump changes from the starting state to the stopping state, a batch start instruction is generated, and the pumps in the combination are started batch by batch. At the same time, an audible and visual alarm is given to the equipment with abnormal start. When the system voltage returns to normal, the system resumes operation in the monitoring state.

[0041] If the detected voltage is < 330V and the voltage sag time > 3s, the batch self-starting device generates an alarm signal to prompt the operator.

[0042] The emergency batch self-starting device provided in this embodiment has multiple advantages:

[0043] (1) Through the real-time detection and rapid response to momentary power fluctuations, the dead zone problem of the cooperation between the contactor and the low-voltage comprehensive protector can be effectively avoided;

[0044] (2) Using the PLC controller as the core component of the control device and configuring the IO module for isolation, the controller analyzes and outputs in the form of digital signals, which can effectively shield external interference and ensure the reliable operation of the control system;

[0045] (3) The control system is convenient for installation and debugging. In the PLC control program, "soft wiring" is used instead of "hard wiring", which can conveniently complete parameter modification, simplifies the previous relay-based control circuit, and the system has good compatibility with the electrical control system. After batch self-starting, it can seamlessly connect to the electrical control system;

[0046] (4) The control system has multiple functions such as voltage data recording, start event recording, and daily maintenance switching.

[0047] Embodiment 2

[0048] In this embodiment, the control module monitors the actual working state of the pumps according to the bus voltage detection result and the pump state signal, generates a switching instruction for the pumps with abnormal work, and completes the switching between the main pump and the standby pump, so as to facilitate the operator to maintain the main pump.

[0049] For example, the control module may detect that the flow rate of a certain pump is significantly lower or fluctuates compared with the process design value, which may be due to the decline of the pump performance or pipeline blockage. At this time, the analysis result of the control module is that the pump is working abnormally, generates a switching instruction to disconnect the contactor of the pump by the switch module, starts the standby pump, and generates an alarm and event record in the display module to prompt the operator to conduct a maintenance inspection.

[0050] Embodiment 3

[0051] In this embodiment, the display module is used to receive the switching instruction input by the operator. To meet the needs of daily maintenance, the operator inputs the switching instruction in the display module according to the maintenance plan, and the control module controls the corresponding pump to switch according to the operator's input, stops the main pump and switches it to the standby pump.

[0052] The above are only the embodiments of the present invention, and the present invention is not limited to the fields involved in this embodiment. Common knowledge such as the specific structures and characteristics known in the solutions is not described in detail herein. It should be noted that for those skilled in the art, without departing from the structure of the present invention, several deformations and improvements can be made, which should also be regarded as the protection scope of the present invention, and these will not affect the implementation effect of the present invention and the practicality of the patent. The protection scope required by this application should be subject to the content of its claims, and the specific implementation manners described in the specification can be used to interpret the content of the claims.

Claims

1. A novel emergency batch self-starting device for motor equipment, characterized in that: It includes a signal acquisition module, an IO module, a control module, a switch module, a display module and a UPS, where: The signal acquisition module is electrically connected to the IO module and is used to acquire the bus voltage signal and the pump status signal; The IO module is also electrically connected to the switch module and the control module and is used to provide electrical isolation between the control system and external interference; The control module is used to store the bus voltage signal and the pump status signal, complete the AD conversion of the acquired signals, generate batch self-start signals, and send the power-sag information, pump status change information, and self-start records to the display module; The switch module is used to close the contactors of the corresponding motors according to the batch self-start signals; The display module is used to integrate the power-sag information, pump status change information, and self-start records and provide a display to the user; The UPS is used to supply power to the signal acquisition module, the IO module and the control module.

2. The emergency batch self-starting device for a new type of motor equipment according to claim 1, wherein: The signal acquisition module includes a bus voltage unit and a pump status unit. The bus voltage unit is used to acquire the bus voltage signal, and the pump status unit is used to acquire the pump status signal and the pump voltage signal.

3. A novel emergency batch self-starting device for motor equipment according to claim 2, characterized in that: The bus voltage unit samples at intervals of 10 ms, and the pump status unit samples at intervals of 0.5 seconds.

4. A novel emergency batch self-starting device for motor equipment according to claim 1, characterized in that: The control module communicates with the host computer through the TCP protocol. The control module includes an execution subunit, a detection subunit, and a batch start subunit. Among them, the execution subunit is used to complete TCP protocol control, establish communication with the host computer, and realize online monitoring of the control module's execution; the detection subunit conducts online monitoring of the bus voltage signal; the batch start subunit starts different batches of pump combinations in batches according to the status of the bus voltage signal.

5. A novel emergency batch self-starting device for motor equipment according to claim 4, characterized in that: The control module is also used to generate a switching instruction according to the pump status signal, and the switch module completes the switching between the main pump and the standby pump according to the switching instruction.

6. A novel emergency batch self-starting device for motor equipment according to claim 4, characterized in that: The display module is also used to receive user instructions and send them to the control module. The control module generates a switching instruction according to the user instruction, and the switch module completes the switching between the main pump and the standby pump according to the switching instruction.

Images