Full-frequency-conversion one-use and one-standby circulating water pump control system

Abstract

The utility model relates to a circulating water pump control technology, and provides a full-frequency-conversion one-use and one-standby circulating water pump control system. The system mainly comprises a three-phase four-wire system power supply, a load switch connected with the power supply, two circuit breakers and two frequency converters which are respectively connected with a first water pump and a second water pump. The remote / local change-over switch controls local start and stop of the water pumps, the first water pump is controlled through a first button and a second button, and the second water pump is controlled through a third button and a fourth button. Through integration of short circuit, overload and lightning protection and a remote monitoring function, the safety, intelligence and efficiency of the system are significantly improved, and the cost is reduced at the same time.

Description

Technical Field

[0001] The utility model relates to the technical field of circulating water pump control, in particular to the technical field of full-frequency conversion one-in-service and one-in-standby circulating water pump control. Background Art

[0002] Circulating water pumps are widely used in water supply, cooling, heating and other systems in industrial production and buildings. Traditional circulating water pump control systems usually adopt local control mode, and operators manually start and stop the water pump, which has problems such as high labor intensity, untimely control, and low efficiency. In order to improve control efficiency, some systems have introduced remote control functions, but there are still some problems, such as safety issues: lack of effective short circuit, overload and lightning protection, which can easily cause damage to the water pump motor and control components, affecting the normal operation of the system. For example, reliability issues: the system operation status cannot be remotely monitored in the local control mode, and once a fault occurs, it cannot be discovered and handled in time, affecting the system's operational reliability, etc.

[0003] To solve the above problems, a full frequency conversion one-in-one-standby circulating water pump control system is needed. This system can improve safety and economy, has perfect short circuit, overload and lightning protection functions, and can improve operating efficiency and reliability. Utility Model Content

[0004] The utility model aims to provide a full-frequency conversion one-in-service-one-standby circulating water pump control system to solve the problems raised in the above-mentioned background technology.

[0005] The present application discloses a full-frequency conversion one-in-use one-in-standby circulating water pump control system, comprising:

[0006] Three-phase four-wire power supply;

[0007] A load switch connected to the three-phase four-wire power supply;

[0008] A first circuit breaker and a second circuit breaker are respectively connected to the load switch;

[0009] a first frequency converter, connected to the first circuit breaker and to a first water pump wiring terminal;

[0010] a second frequency converter, connected to the second circuit breaker and to a second water pump terminal;

[0011] A remote / local transfer switch, connected to the outlet terminals of the first circuit breaker and the second circuit breaker respectively;

[0012] A first button and a second button are connected to the local control end of the remote / local conversion switch and are used to start and stop the first water pump locally;

[0013] The third button and the fourth button are connected to the local control end of the remote / local conversion switch and are used to start and stop the second water pump locally.

[0014] In a preferred example, it also includes: a plurality of intermediate relays, which are respectively connected to the remote control end of the remote / local conversion switch, the operation and fault output terminals of the first inverter, and the operation and fault output terminals of the second inverter, and are used to remotely control the start and stop of the first water pump and the second water pump and indicate the operating status.

[0015] In a preferred example, it also includes: a surge protector, connected to the load switch on the power supply side, for preventing lightning strikes.

[0016] In a preferred example, it further comprises: a first cooling fan and a second cooling fan, which are respectively arranged near the first inverter and the second inverter, and are used to dissipate heat and cool the inverter.

[0017] In a preferred example, it further comprises: a first current transformer, which is arranged at the output terminal of the first frequency converter and is used to obtain the operating current of the first water pump.

[0018] In a preferred example, it also includes: a second current transformer, which is arranged at the output terminal of the second frequency converter and is used to obtain the operating current of the second water pump.

[0019] In a preferred example, one outlet terminal of the first circuit breaker is respectively connected to the remote / local conversion switch, the normally closed contact of the third intermediate relay, the running output terminal and the fault output terminal of the first inverter through the first fuse;

[0020] One outlet terminal of the second circuit breaker is respectively connected to the remote / local transfer switch, the normally closed contact of the seventh intermediate relay, the running output terminal and the fault output terminal of the second frequency converter through the second fuse.

[0021] In a preferred embodiment, it further comprises a first indicator light, a second indicator light and a third indicator light, which are respectively connected to the normally closed contact of the third intermediate relay, the operation output terminal and the fault output terminal of the first inverter, and are used to indicate the operation status of the first water pump; and

[0022] It also includes a fourth indicator light, a fifth indicator light and a sixth indicator light, which are respectively connected to the normally closed contact of the seventh intermediate relay, the operation output terminal and the fault output terminal of the second inverter, and are used to indicate the operation status of the second water pump.

[0023] Compared with the prior art, the embodiments of the present invention have at least the following differences and effects:

[0024] The present application can improve safety and economy, has perfect short circuit, overload and lightning protection functions, and can improve operation efficiency and reliability. Therefore, the present application has a very broad application prospect.

[0025] The specification of the utility model records a large number of technical features, which are distributed in various technical solutions. If all possible combinations of technical features of the utility model (i.e., technical solutions) are to be listed, the specification will be too long. In order to avoid this problem, the various technical features disclosed in the above utility model content, the various technical features disclosed in the various embodiments and examples below, and the various technical features disclosed in the accompanying drawings can be freely combined with each other to form various new technical solutions (these technical solutions are all deemed to have been recorded in this specification), unless such a combination of technical features is technically infeasible. For example, in one example, feature A+B+C is disclosed, and in another example, feature A+B+D+E is disclosed, and features C and D are equivalent technical means that play the same role. Technically, only one can be used, and it is impossible to use them at the same time. Feature E can be combined with feature C technically. Then, the solution of A+B+C+D should not be deemed to have been recorded because it is technically infeasible, and the solution of A+B+C+E should be deemed to have been recorded. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is an electrical schematic diagram of the primary circuit of a full-frequency one-in-one-standby circulating water pump control system according to the first embodiment of the utility model.

[0027] Figure 2 It is an electrical schematic diagram of a secondary circuit of a full-frequency one-in-one-standby circulating water pump control system according to the first embodiment of the utility model.

[0028] Throughout the drawings, the same reference numerals are used to denote the same elements or structures, wherein:

[0029] QS01: Load switch

[0030] QF11-QF12: first and second circuit breakers

[0031] FC1-FC2: first and second frequency converters

[0032] KH1-KH4: The first to fourth thermal relays

[0033] FU1-FU7: The first to seventh fuses

[0034] PSD: Surge Protector

[0035] TA1-TA2: First and second current transformers

[0036] PA1-PA2: First and second ammeters

[0037] KA1-KA8: The first to the eighth intermediate relay

[0038] HL1-HL6: The first to sixth indicator lights

[0039] SA1: Transfer switch

[0040] SB1-SB4: First to fourth buttons

[0041] FM1-FM2: first and second cooling fans DETAILED DESCRIPTION

[0042] In the following description, many technical details are provided to help readers better understand the present application. However, those skilled in the art can understand that even without these technical details and various changes and modifications based on the following embodiments, the technical solutions claimed in the claims of the present application can be implemented. In addition, the technical features involved in the various embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0043] In order to make the objectives, technical solutions and advantages of the present application more clear, the implementation methods of the present application will be further described in detail below with reference to the accompanying drawings.

[0044] First embodiment

[0045] See also Figure 1 and Figure 2 As shown, the full-frequency conversion one-in-one-standby circulating water pump control system of this embodiment includes: a three-phase four-wire power supply; a load switch QS01, connected to the three-phase four-wire power supply; a first circuit breaker QF11 and a second circuit breaker QF12, respectively connected to the load switch QS01; a first frequency converter FC1, connected to the first circuit breaker QF11, and connected to the first water pump wiring terminal; a second frequency converter FC2, connected to the second circuit breaker QF12, and connected to the second water pump wiring terminal; a remote / local transfer switch SA1, respectively connected to the outlet terminals of the first circuit breaker QF11 and the second circuit breaker QF12; a first button SB1 and a second button SB2, connected to the local control terminal of the remote / local transfer switch SA1, for locally starting and stopping the first water pump; a third button SB3 and a fourth button SB4, connected to the local control terminal of the remote / local transfer switch SA1, for locally starting and stopping the second water pump.

[0046] Optionally, the full-frequency one-in-one-standby circulating water pump control system of the present embodiment further includes: a number of intermediate relays KA1-KA8, which are respectively connected to the remote control end of the remote / local conversion switch SA1, the operation and fault output terminals of the first frequency converter FC1, and the operation and fault output terminals of the second frequency converter FC2, and are used to remotely control the start and stop of the first water pump and the second water pump and indicate the operating status.

[0047] Optionally, the full-frequency one-in-one-standby circulating water pump control system of this embodiment further includes: a surge protector PSD, which is connected to the load switch QS01 on the power supply side to prevent lightning strikes.

[0048] Optionally, the full-frequency one-in-one-standby circulating water pump control system of this embodiment further includes: a first cooling fan FM1 and a second cooling fan FM2, which are respectively arranged near the first frequency converter FC1 and the second frequency converter FC2, and are used to dissipate heat and cool the frequency converters.

[0049] Optionally, the full-frequency one-in-one-standby circulating water pump control system of this embodiment further includes: a first current transformer TA1, which is arranged at the output terminal of the first frequency converter FC1 and is used to obtain the operating current of the first water pump.

[0050] Optionally, the full-frequency one-in-one-standby circulating water pump control system of this embodiment further includes: a second current transformer TA2, which is arranged at the output terminal of the second frequency converter FC2 and is used to obtain the operating current of the second water pump.

[0051] Optionally, in the full-frequency one-in-use-one-standby circulating water pump control system of this embodiment, one outlet terminal of the first circuit breaker QF11 is respectively connected to the remote / local conversion switch SA1, the normally closed contact of the third intermediate relay KA3, the running output terminal and the fault output terminal of the first frequency converter FC1 through the first fuse FU1;

[0052] One outlet terminal of the second circuit breaker QF12 is respectively connected to the remote / local transfer switch SA1, the normally closed contact of the seventh intermediate relay KA7, and the running output terminal and the fault output terminal of the second frequency converter FC2 through the second fuse FU2.

[0053] Optionally, the full-frequency conversion one-in-one-standby circulating water pump control system of this embodiment further includes a first indicator light HL1 ( Figure 2 HG1 in the middle), the second indicator light HL2 ( Figure 2 HR1) and the third indicator light HL3 ( Figure 2 HY1 in the figure), which is respectively connected to the normally closed contact of the third intermediate relay KA3, the operation output terminal and the fault output terminal of the first frequency converter FC1, and is used to indicate the operation status of the first water pump; and also includes a fourth indicator light HL4 ( Figure 2 HG2 in the middle), the fifth indicator light HL5 ( Figure 2 HR2) and the sixth indicator light HL6 ( Figure 2 HY2) is respectively connected to the normally closed contact of the seventh intermediate relay KA7, the operation output terminal and the fault output terminal of the second frequency converter FC2, and is used to indicate the operating status of the second water pump.

[0054] Combine the following Figure 1 and Figure 2 , the full-frequency conversion one-in-one-standby circulating water pump control system of this embodiment is further described in detail.

[0055] like Figure 1 As shown, the full-frequency one-in-use-one-standby circulating water pump control system includes a three-phase four-wire power supply (AC380V 50Hz) connected to the first load switch QS01, and the load switch QS01 is respectively connected to the first circuit breaker QF11, the second circuit breaker QF12, the fourth fuse FU4, the fifth fuse FU5, the sixth fuse FU6, and the seventh fuse FU7. The first circuit breaker QF11 is connected to the first frequency converter FC1, and the first frequency converter FC1 is connected to the first water pump terminal; the second circuit breaker QF12 is connected to the second frequency converter FC2, and the second frequency converter FC2 is connected to the second water pump terminal; the fourth fuse FU4, the fifth fuse FU5, the sixth fuse FU6, and the seventh fuse FU7 are connected to the surge protector PSD, and the surge protector PSD is connected to the ground protection PE (Protective Earth). The first current transformer TA1 obtains the operating current of the first water pump through the cable at the outlet end of the first frequency converter FC1, and the first current transformer TA1 is connected to the first ammeter PA1 and the grounding protection PE; the second current transformer TA2 obtains the operating current of the second water pump through the cable at the outlet end of the second frequency converter FC2, and the second current transformer TA2 is connected to the second ammeter PA2 and the grounding protection PE.

[0056] Further, such as Figure 2As shown, an outlet terminal of the first circuit breaker QF11 is connected to the first fuse FU1, and the first fuse FU1 is respectively connected to the remote / local conversion switch SA1, the normally closed contact of the third intermediate relay KA3, the running output terminal of the first frequency converter FC1, and the fault output terminal of the first frequency converter FC1; the remote / local conversion switch SA1 is respectively connected to the first button SB1 and the remote control terminal; the first button SB1 is respectively connected to the second button SB2 and the normally open contact of the first intermediate relay KA1; the second button SB2 and the normally open contact of the first intermediate relay KA1 are connected to the control coil of the first intermediate relay KA1; the remote control terminal is connected to the control coil of the second intermediate relay KA2; the control coil of the first intermediate relay KA1 The control coil and the control coil of the second intermediate relay KA2 are connected to the normally closed contact of the fourth intermediate relay KA4, and the normally closed contact of the fourth intermediate relay KA4 is connected to the neutral line N; the normally closed contact of the third intermediate relay KA3 is connected to the first indicator light HL1, and the first indicator light HL1 is connected to the neutral line N; the running output terminals of the first frequency converter FC1 are respectively connected to the control coil of the third intermediate relay KA3 and the second indicator light HL2; the control coil of the third intermediate relay KA3 and the second indicator light HL2 are connected to the neutral line N; the fault output terminals of the first frequency converter FC1 are respectively connected to the control coil of the fourth intermediate relay KA4 and the third indicator light HL3; the control coil of the fourth intermediate relay KA4 and the third indicator light HL3 are connected to the neutral line N.

[0057] Further, such as Figure 2 As shown, an outlet terminal of the second circuit breaker QF12 is connected to the second fuse FU2, and the second fuse FU2 is respectively connected to the remote / local conversion switch SA1, the normally closed contact of the seventh intermediate relay KA7, the running output terminal of the second frequency converter FC2, and the fault output terminal of the second frequency converter FC2; the remote / local conversion switch SA1 is respectively connected to the third button SB3 and the remote control terminal; the third button SB3 is respectively connected to the fourth button SB4 and the normally open contact of the fifth intermediate relay KA5; the fourth button SB4 and the normally open contact of the fifth intermediate relay KA5 are connected to the control coil of the fifth intermediate relay KA5; the remote control terminal is connected to the control coil of the sixth intermediate relay KA6; the control coil of the fifth intermediate relay KA5 The control coil and the control coil of the sixth intermediate relay KA6 are connected to the normally closed contact of the eighth intermediate relay KA8, and the normally closed contact of the eighth intermediate relay KA8 is connected to the neutral line N; the normally closed contact of the seventh intermediate relay KA7 is connected to the fourth indicator light HL4, and the fourth indicator light HL4 is connected to the neutral line N; the running output terminals of the second frequency converter FC2 are respectively connected to the control coil of the seventh intermediate relay KA7 and the fifth indicator light HL5; the control coil of the seventh intermediate relay KA7 and the fifth indicator light HL5 are connected to the neutral line N; the fault output terminals of the second frequency converter FC2 are respectively connected to the control coil of the eighth intermediate relay KA8 and the sixth indicator light HL6; the control coil of the eighth intermediate relay KA8 and the sixth indicator light HL6 are connected to the neutral line N.

[0058] Further, such as Figure 2 As shown, one output terminal of the load switch QS01 is connected to the third fuse FU3; the third fuse FU3 is respectively connected to the normally open contact of the third intermediate relay KA3 and the normally open contact of the seventh intermediate relay KA7; the normally open contact of the third intermediate relay KA3 and the normally open contact of the seventh intermediate relay KA7 are respectively connected to the first cooling fan FM1 and the second cooling fan FM2; the first cooling fan FM1 and the second cooling fan FM2 are connected to the neutral line N.

[0059] Working process:

[0060] The operation process of the full-frequency conversion one-in-one-standby circulating water pump control system of this embodiment is as follows:

[0061] 1) Initialize the system:

[0062] Activate the main power supply: Turn on the load switch QS01 in the control cabinet.

[0063] Ensure the circuit is complete: close all circuit breakers QF11-QF12 and fuses FU1-FU7, and the system is ready.

[0064] 2) Configure the operation mode:

[0065] Select the operating mode: Use the conversion switch SA1 to determine whether the system is in remote control or local operation.

[0066] Set inverter parameters: Set the operating parameters according to requirements on the control panel of inverter FC1-FC2.

[0067] 3) On-site operation:

[0068] If local operation mode is selected:

[0069] Start or stop the first water pump: Use button SB1 to start and button SB2 to stop.

[0070] Start or stop the second water pump: Use button SB3 to start and button SB4 to stop.

[0071] 4) Remote control:

[0072] If the system is in remote mode:

[0073] Control the first water pump: adjust the output frequency of the first inverter FC1 to control the speed through the frequency given signal, and feed back the operating frequency to the remote control center through the 4-20mA signal.

[0074] Control the second water pump: Perform the same operation through the second frequency converter FC2 to control the speed and feedback the operating status.

[0075] Through the above steps, the system of the utility model not only ensures the efficient and reliable operation of the circulating water pump control system, but also provides flexible operation options and instant status feedback, thereby significantly improving the safety, intelligence and economy of the system.

[0076] Compared with the prior art, the above embodiments have the following beneficial effects:

[0077] The full frequency conversion technology is used to control the one-in-use and one-in-standby circulating water pump, which can flexibly adjust the water pump speed according to actual load requirements, realize energy-saving operation of the water pump, and reduce energy consumption costs.

[0078] Two control modes, local and remote, are set up for flexible and convenient operation. The local button can realize on-site control of the water pump, and the remote port can realize centralized management and automatic control of the water pump.

[0079] Equipped with multiple protection functions, including short circuit protection, overload protection, lightning protection, etc., it improves the reliability and safety of the system and extends the service life of the equipment.

[0080] A current transformer is used to detect the operating current of the water pump in real time, and the working status of the water pump is intuitively displayed through indicator lights, which is convenient for system monitoring and maintenance.

[0081] The inverter comes with a panel that can display and set various operating parameters, and has the function of fault recording and historical data storage, which provides data support for system optimization and fault diagnosis and improves the level of intelligent control.

[0082] The cooling fan is used to effectively dissipate heat for components such as the inverter to prevent overheating of the components and affect performance, thereby improving the stability of the system.

[0083] The control system has a compact structure, is easy to install and debug, and has high reliability. It can meet the automatic control needs of a one-in-one-standby circulating water pump in an industrial environment and has broad application prospects.

[0084] It should be noted that all documents mentioned in this utility model are cited as references in this application, just as each document is cited as reference separately. In addition, it should be understood that after reading the above teaching content of the utility model, those skilled in the art can make various changes or modifications to the utility model, and these equivalent forms also fall within the scope defined by the claims attached to this application.

[0085] Furthermore, in the claims and specification of this patent, relational terms such as first and second, etc., are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "comprise one" do not exclude the existence of other identical elements in the process, method, article or device including the elements. In the claims and specification of this patent, if it is mentioned that an action is performed according to an element, it means at least the meaning of performing the action according to the element, which includes two situations: performing the action only according to the element, and performing the action according to the element and other elements.

[0086] Although the present invention has been illustrated and described with reference to certain preferred embodiments thereof, it will be apparent to those skilled in the art that various changes may be made in form and details without departing from the spirit and scope of the present invention.

Claims

1. A full frequency conversion one-in-one-standby circulating water pump control system, characterized in that: include: Three-phase four-wire power supply; A load switch connected to the three-phase four-wire power supply; A first circuit breaker and a second circuit breaker are respectively connected to the load switch; a first frequency converter, connected to the first circuit breaker and to a first water pump wiring terminal; a second frequency converter, connected to the second circuit breaker and to a second water pump terminal; A remote / local transfer switch, connected to the outlet terminals of the first circuit breaker and the second circuit breaker respectively; A first button and a second button are connected to the local control end of the remote / local conversion switch and are used to start and stop the first water pump locally; The third button and the fourth button are connected to the local control end of the remote / local conversion switch and are used to start and stop the second water pump locally.

2. The system according to claim 1, characterized in that It also includes: a plurality of intermediate relays, which are respectively connected to the remote control end of the remote / local conversion switch, the operation and fault output terminals of the first inverter, and the operation and fault output terminals of the second inverter, and are used to remotely control the start and stop of the first water pump and the second water pump and indicate the operation status.

3. The system according to claim 1, characterized in that It also includes: a surge protector, which is connected to the load switch on the power supply side to prevent lightning strikes.

4. The system according to claim 1, characterized in that It also includes: a first cooling fan and a second cooling fan, which are respectively arranged near the first frequency converter and the second frequency converter and are used to dissipate heat and cool the frequency converter.

5. The system according to claim 1, wherein: It also includes: a first current transformer, which is arranged at the output terminal of the first frequency converter and is used to obtain the operating current of the first water pump.

6. The system according to claim 1, characterized in that It also includes: a second current transformer, which is arranged at the output terminal of the second frequency converter and is used to obtain the operating current of the second water pump.

7. The system according to claim 1, characterized in that One outlet terminal of the first circuit breaker is respectively connected to the remote / local conversion switch, the normally closed contact of the third intermediate relay, the operation output terminal and the fault output terminal of the first inverter through the first fuse; One outlet terminal of the second circuit breaker is respectively connected to the remote / local transfer switch, the normally closed contact of the seventh intermediate relay, the running output terminal and the fault output terminal of the second frequency converter through the second fuse.

8. The system of claim 1, wherein: It also includes a first indicator light, a second indicator light and a third indicator light, which are respectively connected to the normally closed contact of the third intermediate relay, the operation output terminal and the fault output terminal of the first inverter, and are used to indicate the operation status of the first water pump; and It also includes a fourth indicator light, a fifth indicator light and a sixth indicator light, which are respectively connected to the normally closed contact of the seventh intermediate relay, the operation output terminal and the fault output terminal of the second inverter, and are used to indicate the operation status of the second water pump.

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