Electrical control system for boiler pressurization and circulating oil pumps

Abstract

The application relates to the technical field of industrial boiler control, and specifically discloses a kind of electrical control system of boiler pressurization and circulating oil pump, including: main circuit and control alarm circuit, wherein, the main circuit includes: three-phase power supply, frequency converter loop, first power frequency loop, second power frequency loop;The three-phase power supply includes firewire L1, L2, L3 and zero line N;The frequency converter loop includes switch Q12, frequency converter and pressurization pump M connected in sequence;The first power frequency loop includes switch Q14, main contact of contactor KM1 and circulating pump M1 connected in sequence;The second power frequency loop includes switch Q17, main contact of contactor KM2 and circulating pump M2 connected in sequence;The control alarm circuit includes: alarm power supply circuit, audible and visual alarm, fault signal input network.

Description

Technical Field

[0001] This application relates to the field of industrial boiler control technology, specifically to an electrical control system for boiler pressurization and circulating oil pumps. Background Technology

[0002] With the development of electrical technology and the updating of various electrical components and control methods, frequency converter control is superior to contactor control in all aspects. Changing the control method of the oil pump from traditional contactor control to frequency converter control is now an energy-saving and intelligent renovation solution.

[0003] Because current boiler pressurization oil pumps are used for long periods of time, they are controlled by contactors, relying on start-stop to control flow and pressure. This is inefficient, and frequent start-stop may damage the motor. It also consumes a lot of energy. Due to the age of the electrical components in the control circuit, the circuits are aging, leading to frequent failures and unstable operation of the oil pump. Summary of the Invention

[0004] The purpose of this application is to provide an electrical control system for boiler pressurization and circulating oil pumps to solve the problems in the prior art.

[0005] To achieve the above objectives, this application provides an electrical control system for a boiler pressurization and circulating oil pump, comprising: a main circuit and a control alarm circuit, wherein, The main circuit includes: a three-phase power supply, a frequency converter circuit, a first power frequency circuit, and a second power frequency circuit; The three-phase power supply includes live wires L1, L2, L3 and neutral wire N; The inverter circuit includes a switch Q12, an inverter, and a booster pump M connected in sequence. The first power frequency circuit includes a switch Q14, the main contacts of a contactor KM1, and a circulating pump M1 connected in sequence; The second power frequency circuit includes a switch Q17, the main contacts of contactor KM2, and a circulating pump M2 connected in sequence; The control alarm circuit includes: an alarm power supply circuit, an audible and visual alarm, and a fault signal input network.

[0006] Optionally, the alarm power supply circuit includes a switch Q21, the input terminal of which is connected to the live wire L1; The audible and visual alarm is connected between the fault alarm output terminal of the frequency converter, the normally open auxiliary contacts of contactors KM1 and KM2, and the neutral line N. The fault signal input network includes: a frequency converter alarm trigger branch, a first alarm trigger branch, and a second alarm trigger branch.

[0007] Optionally, the inverter alarm trigger branch includes a switch Q21, the inverter's fault alarm output terminal, and an audible and visual alarm connected in sequence. The first alarm triggering branch includes a switch Q21, a normally open auxiliary contact of a contactor KM1, and an audible and visual alarm connected in sequence. The second alarm triggering branch includes a switch Q21, a normally open auxiliary contact of a contactor KM2, and an audible and visual alarm connected in sequence.

[0008] Optionally, the input terminals of switches Q12, Q14, and Q17 are all connected to the live wires L1, L2, and L3. The output terminal of the switch Q12 is connected to the power input terminal of the frequency converter, and the output terminal of the frequency converter is connected to the power input terminal of the booster pump M. The output terminal of the switch Q14 is connected to the input terminal of the main contact of the contactor KM1, and the output terminal of the main contact of the contactor KM1 is connected to the power input terminal of the circulating pump M1. The output terminal of the switch Q17 is connected to the input terminal of the main contact of the contactor KM2, and the output terminal of the main contact of the contactor KM2 is connected to the power input terminal of the circulating pump M2.

[0009] Optionally, the input terminal of the switch Q21 is connected to the live wire L1, the output terminal of the switch Q21 is connected to the TC terminal of the frequency converter, the TA terminal of the frequency converter is connected to the power input terminal of the audible and visual alarm, and the power output terminal of the audible and visual alarm is connected to the neutral wire N. The input terminal of the auxiliary contact of the contactor KM1 is connected to the output terminal of the switch Q21, and the output terminal of the auxiliary contact of the contactor KM1 is connected to the power input terminal of the audible and visual alarm. The input terminal of the auxiliary contact of the contactor KM2 is connected to the output terminal of the switch Q21, and the output terminal of the auxiliary contact of the contactor KM2 is connected to the power input terminal of the audible and visual alarm.

[0010] Optionally, the switches Q12, Q14, Q17, and Q21 are air switches or circuit breakers.

[0011] Optionally, the frequency converter is a vector frequency converter or a V / F control frequency converter suitable for three-phase asynchronous motor control.

[0012] Optionally, the auxiliary contacts of contactors KM1 and KM2 are normally open auxiliary contacts.

[0013] The embodiments of this application have the following advantages: Compared to existing technologies, the system provided by the above technical solution, using a frequency converter, can more precisely control flow and pressure by adjusting the motor speed. It also offers a soft-start function, reducing the impact on the power grid during startup. This saves energy, extends motor life, and reduces mechanical shock. Furthermore, the frequency converter has an alarm output function. When a fault occurs, the installed high-frequency audible and visual alarm can effectively and promptly alert maintenance personnel, allowing for rapid on-site inspection and troubleshooting, thereby reducing oil pump failures and resulting downtime for production equipment. Moreover, using a frequency converter results in a cleaner and more organized control cabinet, fewer wiring, and faster, more convenient, and safer maintenance. Attached Figure Description

[0014] To more clearly illustrate the embodiments of this application or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are merely exemplary, and those skilled in the art can derive other embodiments based on the provided drawings without creative effort.

[0015] Figure 1 A partial circuit diagram of an electrical control system for a boiler pressurization and circulating oil pump, provided for at least one embodiment of this application; Figure 2 Another part of the circuit diagram of an electrical control system for a boiler pressurization and circulating oil pump provided for at least one embodiment of this application. Detailed Implementation

[0016] The following specific embodiments illustrate the implementation of this application. Those skilled in the art can easily understand other advantages and effects of this application from the content disclosed in this specification. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments in this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0017] In the description of this application, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used solely for the convenience of describing this application and for simplification, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application. Furthermore, the terms "first," "second," and "third," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance. Unless otherwise expressly specified and limited, the terms "set," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; a mechanical connection or an electrical connection; a direct connection or an indirect connection through an intermediate medium; or a connection within two elements. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0018] Furthermore, the technical features involved in the different embodiments of this application described below can be combined with each other as long as they do not conflict with each other.

[0019] This application provides a boiler oil pump system based on variable frequency control. This system can achieve energy saving and consumption reduction, smooth control, extended equipment life, and has efficient multi-stage, independent fault alarm functions. (Reference) Figure 1 The system, as shown in the diagram, includes a main circuit and a control and alarm circuit. The main circuit includes: a three-phase power supply, a frequency converter circuit, a first power frequency circuit, and a second power frequency circuit; The three-phase power supply includes live wires L1, L2, L3 and neutral wire N; The inverter circuit includes a switch Q12, an inverter, and a booster pump M connected in sequence. The first power frequency circuit includes a switch Q14, the main contacts of a contactor KM1, and a circulating pump M1 connected in sequence; The second power frequency circuit includes a switch Q17, the main contacts of contactor KM2, and a circulating pump M2 connected in sequence; The control alarm circuit includes: an alarm power supply circuit, an audible and visual alarm, and a fault signal input network.

[0020] In some embodiments, the alarm power supply circuit includes a switch Q21, the input terminal of which is connected to the live wire L1; The audible and visual alarm is connected between the fault alarm output terminal of the frequency converter, the normally open auxiliary contacts of contactors KM1 and KM2, and the neutral line N. The fault signal input network includes: a frequency converter alarm trigger branch, a first alarm trigger branch, and a second alarm trigger branch.

[0021] In some embodiments, the inverter alarm trigger branch includes a switch Q21, the inverter's fault alarm output terminal, and an audible and visual alarm connected in sequence. The first alarm triggering branch includes a switch Q21, a normally open auxiliary contact of a contactor KM1, and an audible and visual alarm connected in sequence. The second alarm triggering branch includes a switch Q21, a normally open auxiliary contact of a contactor KM2, and an audible and visual alarm connected in sequence.

[0022] In some embodiments, the input terminals of switches Q12, Q14, and Q17 are all connected to the live wires L1, L2, and L3. The output terminal of the switch Q12 is connected to the power input terminal of the frequency converter, and the output terminal of the frequency converter is connected to the power input terminal of the booster pump M. The output terminal of the switch Q14 is connected to the input terminal of the main contact of the contactor KM1, and the output terminal of the main contact of the contactor KM1 is connected to the power input terminal of the circulating pump M1. The output terminal of the switch Q17 is connected to the input terminal of the main contact of the contactor KM2, and the output terminal of the main contact of the contactor KM2 is connected to the power input terminal of the circulating pump M2.

[0023] In some embodiments, the input terminal of switch Q21 is connected to the live wire L1, the output terminal of switch Q21 is connected to the TC terminal of the frequency converter, the TA terminal of the frequency converter is connected to the power input terminal of the audible and visual alarm, and the power output terminal of the audible and visual alarm is connected to the neutral wire N. The input terminal of the auxiliary contact of the contactor KM1 is connected to the output terminal of the switch Q21, and the output terminal of the auxiliary contact of the contactor KM1 is connected to the power input terminal of the audible and visual alarm. The input terminal of the auxiliary contact of the contactor KM2 is connected to the output terminal of the switch Q21, and the output terminal of the auxiliary contact of the contactor KM2 is connected to the power input terminal of the audible and visual alarm.

[0024] Specifically, the input terminals of switches Q12, Q14, and Q17 are all connected to the live wires L1, L2, and L3; switch Q12 controls the frequency converter to drive the booster pump M. Switch Q14 and contactor KM1 control the circulating pump M1. Switch Q17 and contactor KM2 control the circulating pump M2.

[0025] Specifically, the input terminal of switch Q21 is connected to the live wire L1, and the output terminal of switch Q21 serves as the power supply terminal of the alarm circuit. Its output terminal is also connected to the common input terminal of the parallel fault signal input network, i.e., connected together with the TC terminal of the frequency converter, the input terminals of the auxiliary contacts of contactor KM1 and KM2, and the input terminals of the auxiliary contacts of contactor KM2. The common output terminal of the parallel fault signal input network is connected to the input terminal of the audible and visual alarm, and the output terminal of the audible and visual alarm is connected to the neutral wire N. Specifically, the fault alarm output terminals of the frequency converter are the TC terminal and the TA terminal, where TC is the common terminal and TA is the normally open contact terminal. The input terminals of the auxiliary contacts of contactors KM1 and KM2, and the TC terminal of the frequency converter are all connected to the output terminal of switch Q21, and their output terminals are connected to the input terminal of the audible and visual alarm.

[0026] In some embodiments, the switches Q12, Q14, Q17, and Q21 are air switches or circuit breakers.

[0027] In some embodiments, the frequency converter is a vector frequency converter or a V / F control frequency converter suitable for three-phase asynchronous motor control.

[0028] In some embodiments, the auxiliary contacts of contactors KM1 and KM2 are normally open auxiliary contacts.

[0029] In summary, compared with existing technologies, using a frequency converter allows for more precise control of flow and pressure by adjusting the motor speed. It also provides a soft-start function, reducing the impact on the power grid during startup. This saves energy, extends motor lifespan, and reduces mechanical shock. Furthermore, the frequency converter has an alarm output function. When a fault occurs, the installed high-frequency audible and visual alarm can effectively and promptly alert maintenance personnel, allowing for rapid on-site inspection and troubleshooting, thereby reducing oil pump failures and resulting downtime. Moreover, using a frequency converter results in a cleaner and more organized control cabinet, fewer wiring, and faster, more convenient, and safer maintenance.

[0030] Note that, unless otherwise explicitly stated, all features disclosed in this specification (including any appended claims, abstract, and drawings) may be replaced by alternative features for achieving the same, equivalent, or similar purpose. Therefore, unless explicitly stated otherwise, each disclosed feature is merely one example of a set of equivalent or similar features. Where used, "further," "preferably," "even further," and "more preferably" are simply starting points for describing another embodiment based on the foregoing embodiments, the combination of which with the foregoing embodiments constitutes the complete configuration of another embodiment. Any combination of several "further," "preferably," "even further," or "more preferably" settings following the same embodiment constitutes yet another embodiment.

[0031] In the implementation of functions and steps, the corresponding functions and steps in the various embodiments may occur in a different order than those shown. For example, two consecutive functions and steps may actually be executed or implemented substantially in parallel, and they may sometimes be executed or implemented in reverse order, depending on the functions involved.

[0032] Although this application has been described in detail above with general descriptions and specific embodiments, some modifications or improvements can be made to it, which will be obvious to those skilled in the art. Therefore, all such modifications or improvements made without departing from the spirit of this application fall within the scope of protection claimed in this application.

Claims

1. An electrical control system for a boiler pressurization and circulating oil pump, characterized in that, include: The main circuit and the control alarm circuit, among which, The main circuit includes: a three-phase power supply, a frequency converter circuit, a first power frequency circuit, and a second power frequency circuit; The three-phase power supply includes live wires L1, L2, L3 and neutral wire N; The inverter circuit includes a switch Q12, an inverter, and a booster pump M connected in sequence. The first power frequency circuit includes a switch Q14, the main contacts of a contactor KM1, and a circulating pump M1 connected in sequence; The second power frequency circuit includes a switch Q17, the main contacts of contactor KM2, and a circulating pump M2 connected in sequence; The control alarm circuit includes: an alarm power supply circuit, an audible and visual alarm, and a fault signal input network.

2. The electrical control system for the boiler pressurization and circulating oil pump according to claim 1, characterized in that, The alarm power supply circuit includes a switch Q21, and the input terminal of the switch Q21 is connected to the live wire L1. The audible and visual alarm is connected between the fault alarm output terminal of the frequency converter, the normally open auxiliary contacts of contactors KM1 and KM2, and the neutral line N. The fault signal input network includes: a frequency converter alarm trigger branch, a first alarm trigger branch, and a second alarm trigger branch.

3. The electrical control system for the boiler pressurization and circulating oil pump according to claim 2, characterized in that, The inverter alarm triggering branch includes a switch Q21, the inverter's fault alarm output terminal, and an audible and visual alarm connected in sequence. The first alarm triggering branch includes a switch Q21, a normally open auxiliary contact of a contactor KM1, and an audible and visual alarm connected in sequence. The second alarm triggering branch includes a switch Q21, a normally open auxiliary contact of a contactor KM2, and an audible and visual alarm connected in sequence.

4. The electrical control system for the boiler pressurization and circulating oil pump according to claim 3, characterized in that, The input terminals of switches Q12, Q14, and Q17 are all connected to live wires L1, L2, and L3. The output terminal of the switch Q12 is connected to the power input terminal of the frequency converter, and the output terminal of the frequency converter is connected to the power input terminal of the booster pump M. The output terminal of the switch Q14 is connected to the input terminal of the main contact of the contactor KM1, and the output terminal of the main contact of the contactor KM1 is connected to the power input terminal of the circulating pump M1. The output terminal of the switch Q17 is connected to the input terminal of the main contact of the contactor KM2, and the output terminal of the main contact of the contactor KM2 is connected to the power input terminal of the circulating pump M2.

5. The electrical control system for the boiler pressurization and circulating oil pump according to claim 4, characterized in that, The input terminal of switch Q21 is connected to the live wire L1, the output terminal of switch Q21 is connected to the TC terminal of the frequency converter, the TA terminal of the frequency converter is connected to the power input terminal of the audible and visual alarm, and the power output terminal of the audible and visual alarm is connected to the neutral wire N. The input terminal of the auxiliary contact of the contactor KM1 is connected to the output terminal of the switch Q21, and the output terminal of the auxiliary contact of the contactor KM1 is connected to the power input terminal of the audible and visual alarm. The input terminal of the auxiliary contact of the contactor KM2 is connected to the output terminal of the switch Q21, and the output terminal of the auxiliary contact of the contactor KM2 is connected to the power input terminal of the audible and visual alarm.

6. The electrical control system for the boiler pressurization and circulating oil pump according to claim 5, characterized in that, The switches Q12, Q14, Q17, and Q21 are air switches or circuit breakers.

7. The electrical control system for the boiler pressurization and circulating oil pump according to claim 6, characterized in that, The frequency converter is a vector frequency converter or a V / F control frequency converter suitable for three-phase asynchronous motor control.

8. The electrical control system for the boiler pressurization and circulating oil pump according to claim 7, characterized in that, The auxiliary contacts of contactors KM1 and KM2 are normally open auxiliary contacts.

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