Circulating water system, control method and related products

Abstract

The invention discloses a circulating water system, a control method and a related product. The circulating water system comprises a frequency converter loop and a secondary loop, in the secondary circuit, the input end of the voltage sag protector is used for connecting a power supply, and in the secondary circuit, the first end of the first switching device and the first end of the second switching device are respectively used for connecting the first end of the power supply; the second end of the first switching device and the second end of the second switching device are respectively connected with the first end of the main contact of the first relay and the first end of the main contact of the second relay, and the second end of the main contact of the first relay and the second end of the main contact of the second relay are respectively connected with the second end of the power supply. According to the secondary loop in the circulating water system, starting control and stopping control of the frequency converter are separated, self-locking operation is carried out after the frequency converter is started, the risk that the frequency converter stops due to voltage sag is reduced, and then the reliability of the circulating water system is improved.

Description

Technical Field

[0001] The present application relates to the technical field of circulating water systems, and in particular to a circulating water system, a control method and related products. Background Art

[0002] A circulating water system is a complete device that uses a pump to circulate a fluid (such as water or other media) through a closed pipeline to achieve heat transfer, media transport, or process requirements. The circulating water system, which includes the inverter circuit and secondary circuit, shares a common power supply. Temporary voltage drops can easily trigger the inverter to shut down, reducing the reliability of the circulating water system.

[0003] In related technologies, a backup power supply, such as an uninterruptible power supply (UPS), is installed in the inverter circuit to prevent the inverter from shutting down in the event of a voltage sag. However, the backup power supply installed in the inverter circuit has limited capacity and cannot cover the voltage sag for a long time, which in turn reduces the reliability of the circulating water system. Summary of the Invention

[0004] Based on the above problems, the present application provides a circulating water system, a control method and related products to improve the reliability of the circulating water system.

[0005] The embodiments of this application disclose the following technical solutions:

[0006] In a first aspect, an embodiment of the present application provides a circulating water system, comprising: a frequency converter circuit and a secondary circuit; wherein the frequency converter circuit comprises a frequency converter, auxiliary contacts of a first relay, and auxiliary contacts of a second relay, the frequency converter being configured to self-lock to start a normally open position and stop a normally closed position with an inverse logic; the secondary circuit comprises a first switching device, a second switching device, a main contact of the first relay, and a main contact of the second relay;

[0007] In the inverter circuit, the common terminal of the inverter is connected to the start terminal of the inverter through the auxiliary contact of the first relay, and the common terminal of the inverter is connected to the stop terminal of the inverter through the auxiliary contact of the second relay;

[0008] In the secondary circuit, the first end of the first switching device and the first end of the second switching device are respectively used to connect to the first end of the power supply, the second end of the first switching device and the second end of the second switching device are respectively connected to the first end of the main contact of the first relay and the first end of the main contact of the second relay, and the second end of the main contact of the first relay and the second end of the main contact of the second relay are respectively connected to the second end of the power supply.

[0009] In a possible embodiment, the invention further includes: a controller;

[0010] The controller is configured to control the first switch device to be turned on, the main contact of the first relay to be closed, and the auxiliary contact of the first relay to be closed, so that the inverter starts in a self-locking manner.

[0011] In a possible embodiment, the invention further includes: a controller;

[0012] The controller is configured to control the second switching device to be turned on, the main contact of the second relay to be attracted, and the auxiliary contact of the second relay to be disconnected, so as to shut down the inverter.

[0013] In a possible embodiment, the invention further includes: an emergency stop switch;

[0014] In the inverter circuit, the common end of the inverter is connected to the emergency stop terminal of the inverter through the emergency stop switch;

[0015] In the secondary circuit, a first end of the emergency stop switch is connected to a first end of the power supply, and a second end of the emergency stop switch is connected to a first end of the first switching device and a first end of the second switching device.

[0016] In a possible embodiment, the invention further includes: a switching switch, a third switching device, and a fourth switching device;

[0017] The input end of the switching switch is connected to the second end of the emergency stop switch, the first output end of the switching switch is connected to the first end of the third switching device and the first end of the fourth switching device, and the second output end of the switching switch is connected to the first end of the first switching device;

[0018] A second end of the third switching device is connected to a first end of the main contact of the second relay, and a second end of the fourth switching device is connected to a first end of the main contact of the first relay.

[0019] In a possible embodiment, the first output terminal of the switching switch indicates a local control mode, and the second output terminal of the switching switch indicates a remote control mode.

[0020] In a possible embodiment, the auxiliary contact of the first relay is a normally open contact, and the auxiliary contact of the second relay is a normally closed contact.

[0021] In a second aspect, an embodiment of the present application provides a control method for a circulating water system, wherein the circulating water system includes a frequency converter circuit and a secondary circuit; wherein the frequency converter circuit includes a frequency converter, auxiliary contacts of a first relay, and auxiliary contacts of a second relay, and the frequency converter is configured to self-lock to start a normally open position and stop an inverse logic normally closed position; the secondary circuit includes a first switching device, a second switching device, a main contact of the first relay, and a main contact of the second relay; in the frequency converter circuit, the common end of the frequency converter is connected to the start terminal of the frequency converter through the auxiliary contact of the first relay, and the common end of the frequency converter is connected to the stop terminal of the frequency converter through the auxiliary contact of the second relay; in the secondary circuit, the input end of the voltage sag protector is used to connect to a power supply, and in the secondary circuit, the first end of the first switching device and the first end of the second switching device are respectively used to connect to the first end of the power supply, the second end of the first switching device and the second end of the second switching device are respectively connected to the first end of the main contact of the first relay and the first end of the main contact of the second relay, and the second end of the main contact of the first relay and the second end of the main contact of the second relay are respectively connected to the second end of the power supply;

[0022] Methods include:

[0023] Controlling the first switch device to be turned on, the main contact of the first relay to be attracted, and the auxiliary contact of the first relay to be attracted, so that the frequency converter starts in a self-locking manner;

[0024] The second switch device is controlled to be turned on, the main contact of the second relay is closed, and the auxiliary contact of the second relay is disconnected, so as to stop the frequency converter.

[0025] In a third aspect, an embodiment of the present application provides a computer device, including:

[0026] a memory having a computer program stored thereon;

[0027] The processor is used to execute the computer program in the memory to implement the steps of the control method of the circulating water system of the embodiment of the second aspect.

[0028] In a fourth aspect, an embodiment of the present application provides a computer-readable storage medium having a computer program stored thereon, which, when executed by a processor, implements the steps of the method for controlling the circulating water system of the embodiment of the second aspect.

[0029] Since a backup power supply is introduced into the inverter circuit, the cost of the circulating water system will increase, and in the event of a voltage sag, the inverter will still be at risk of unexpected shutdown. To this end, an embodiment of the present application provides a circulating water system in which the secondary circuit in the circulating water system is separated from the start-up control and shutdown control of the inverter, and self-locks after the inverter is started, thereby reducing the risk of the inverter shutting down due to a voltage sag, and thus improving the reliability of the circulating water system. In addition, the inverter can be automatically reset and started without being affected by the secondary circuit in the event of abnormal power fluctuations. Since a backup power supply does not need to be provided in the main circuit of the inverter in the embodiment of the present application, the cost of the circulating water system is reduced. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative labor.

[0031] Figure 1 A schematic diagram of a circulating water system provided in an embodiment of the present application;

[0032] Figure 2 A schematic diagram of a frequency converter configuration provided in an embodiment of the present application;

[0033] Figure 3 A schematic diagram of a secondary circuit provided in an embodiment of the present application;

[0034] Figure 4 A schematic diagram of a frequency converter circuit provided in an embodiment of the present application;

[0035] Figure 5 A schematic diagram of another secondary circuit provided in an embodiment of the present application;

[0036] Figure 6 A schematic diagram of another secondary circuit provided in an embodiment of the present application;

[0037] Figure 7 A flow chart of a method for controlling a circulating water system provided in an embodiment of the present application;

[0038] Figure 8 A schematic diagram of a computer device provided in an embodiment of the present application. DETAILED DESCRIPTION

[0039] In order to help those skilled in the art better understand the present invention, the following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of this application.

[0040] In the specification and claims of this application, the terms "first" and "second" are used to distinguish different objects, rather than to describe a specific order of objects. For example, "first relay" and "second relay" are used to distinguish different relays, rather than to describe a specific order of relays.

[0041] In the embodiments of this application, words such as "exemplary" or "for example" are used to indicate examples, illustrations, or descriptions. Any embodiment or design described as "exemplary" or "for example" in the embodiments of this application should not be interpreted as being preferred or advantageous over other embodiments or designs. Rather, the use of words such as "exemplary" or "for example" is intended to present the relevant concepts in a concrete manner.

[0042] In the description of the embodiments of the present application, unless otherwise specified, "multiple" means two or more, for example, multiple processing units means two or more processing units, etc.; multiple elements means two or more elements, etc.

[0043] In order to make the following description of the embodiments clearer, the technical terms involved in this application are first introduced.

[0044] The secondary circuit refers to the circuit in the electrical system that is connected by the secondary winding of the transformer, measuring and monitoring instruments, relays, automatic devices, etc. through control cables.

[0045] Self-locking control, the built-in logic of the inverter, locks the current operating parameters under abnormal operating conditions to avoid accidental shutdowns.

[0046] Voltage sag refers to a momentary drop in grid voltage (lasting ≤1 minute) with an amplitude lower than the rated value by 10%-90%.

[0047] In the related art, the circulating water system includes a frequency converter circuit and a secondary circuit that share a power supply. In the event of a voltage drop, the secondary circuit may easily lose power, making it impossible to send control instructions to the frequency converter, resulting in the frequency converter shutting down for protection.

[0048] To this end, embodiments of the present application provide a circulating water system in which the secondary circuit separates the inverter startup and shutdown controls. The system also self-locks after the inverter is started, reducing the risk of the inverter shutting down due to voltage sags and thereby improving the reliability of the circulating water system. Furthermore, embodiments of the present application eliminate the need for a backup power supply in the inverter's primary circuit, reducing the cost of the circulating water system.

[0049] In order to make the above-mentioned objects, features and advantages of the present application more obvious and easy to understand, the embodiments of the present application are further described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0050] See also Figure 1 , which is a schematic diagram of a circulating water system provided in an embodiment of the present application.

[0051] like Figure 1 As shown, the circulating water system includes a frequency converter circuit 2000 and a secondary circuit 1000, wherein the frequency converter circuit 2000 includes the frequency converter 100, the auxiliary contact KA1* of the first relay, and the auxiliary contact KA2* of the second relay. The frequency converter 100 is configured to be a self-locking start normally open point and a stop inverse logic normally closed point; the secondary circuit 1000 includes a first switch device S1, a second switch device S2, the main contact KA1 of the first relay, and the main contact KA2 of the second relay;

[0052] In the inverter circuit 2000, the common terminal COM of the inverter 100 is connected to the start terminal RUN of the inverter through the auxiliary contact KA1* of the first relay, and the common terminal COM of the inverter 100 is connected to the stop terminal STOP of the inverter 100 through the auxiliary contact KA2* of the second relay;

[0053] In the secondary circuit 1000, the first output end is connected to the first end of the first switching device S1 and the first end of the second switching device S2, which are respectively used to connect to the first end of the power supply AC, the second end of the first switching device S1 and the second end of the second switching device S2 are respectively connected to the first end of the main contact KA1 of the first relay and the first end of the main contact KA2 of the second relay, and the second end of the main contact KA1 of the first relay and the second end of the main contact KA2 of the second relay are respectively connected to the second end of the power supply AC.

[0054] For example, taking Danfoss inverter as an example, the inverter settings are as follows: Figure 2 As shown. Figure 2 As shown in (a) in FIG. 1 , terminal 18 is set to start; Figure 2 As shown in (b), terminal 18 is set to self-locking start; Figure 2As shown in (c), terminal 29 is enabled and configured to stop the inverse logic normally closed position. It should be understood that the brand and model of the inverter are not limited in the embodiment of the present application, and this example is only exemplary.

[0055] In a possible embodiment, the auxiliary contact KA1* of the first relay is a normally open contact, and the auxiliary contact KA2* of the second relay is a normally closed contact.

[0056] The present invention provides a circulating water system in which the secondary circuit separates the start-up and shutdown controls for the inverter. The system also self-locks after the inverter starts, reducing the risk of the inverter shutting down due to voltage sags and improving the reliability of the circulating water system. Furthermore, in the event of an abnormal power surge, the inverter automatically resets and starts on the fly, unaffected by the secondary circuit. Because the present invention eliminates the need for a backup power supply in the inverter's primary circuit, the cost of the circulating water system is reduced.

[0057] Based on the circulating water system in the aforementioned embodiment, the start and stop control of the inverter will be introduced accordingly in combination with the inverter circuit and the secondary circuit.

[0058] See again Figure 1 The controller (not shown in the figure) is configured to control the first switch device S1 to be turned on, the main contact KA1 of the first relay to be attracted, and the auxiliary contact KA1* of the first relay to be attracted, so that the inverter starts self-locking.

[0059] It should be understood that the inverter self-locking start mode means that the inverter remains in the running state after starting and will not shut down even if the start signal is lost. In the event of secondary circuit power loss, the inverter will remain in the started state, reducing the risk of unexpected inverter shutdown.

[0060] It should be noted that the type of controller is not specifically limited in the embodiments of the present application. For example, the controller may be a central processing unit (CPU), or other general-purpose processors, digital signal processors (DSP), application-specific integrated circuits (ASIC), field programmable gate arrays (FPGA), or programmable logic controllers (PLC). The general-purpose processor may also be a microprocessor or any conventional processor.

[0061] In one possible implementation, the controller sends a jog signal to the first switching device S1, the main contact KA1 of the first relay is energized, and the auxiliary contact KA1 of the first relay is energized, so that after the inverter is self-locked and started, the main contact KA1 of the first relay is automatically disconnected.

[0062] In another possible implementation, the controller sends a first signal to the first switching device S1 to control the first switching device to turn on, and the main contact KA1 of the first relay to be attracted, so that the inverter starts self-locking; and sends a second signal to the first switching device S1 to control the first switching device S1 to turn off, and the main contact KA1 of the first relay is disconnected.

[0063] In this embodiment of the present application, after the inverter self-locks and starts, the main contacts of the first relay are disconnected, placing the first relay in a non-engaged state. This extends the life of the relay due to long-term engagement and reduces the possibility of unintended shutdowns caused by faults such as contact sticking and abnormal disconnection. Furthermore, in this embodiment of the present application, both switching devices S1 and S2 are pulse normally open, which can reduce the possibility of internal faults caused by long-term closure of the points.

[0064] See again Figure 1 The controller (not shown) is configured to control the second switching device S2 to turn on, the main contact KA2 of the second relay to close, and the auxiliary contact KA2* of the second relay to disconnect, so as to shut down the inverter.

[0065] In a possible implementation, the controller sends a jog signal to the second switching device S2, the main contact KA2 of the second relay is closed, and the auxiliary contact KA2* of the second relay is opened, so that the inverter stops.

[0066] In another possible implementation, the controller sends a first signal to the second switching device S2 to control the second switching device S2 to turn on, the main contact KA2 of the second relay to close, and the auxiliary contact KA2* of the second relay to disconnect, so that the inverter stops; and sends a second signal to the second switching device S2 to control the second switching device S2 to disconnect, and the main contact KA2 of the second relay to disconnect.

[0067] In the embodiment of the present application, after the inverter stops, the second relay is in a non-engaged state, which extends the life of the relay due to long-term engaging and reduces the possibility of non-stop operation caused by faults such as contact sticking and abnormal disconnection.

[0068] See also Figure 3 , which is a schematic diagram of a secondary circuit provided in an embodiment of the present application.

[0069] like Figure 3As shown, in the secondary circuit 1000, the input end of the voltage sag protector 200 is used to connect to the power supply AC, the first output end of the voltage sag protector 200 is connected to the first end of the first switching device S1 and the first end of the second switching device S2, the second end of the first switching device S1 and the second end of the second switching device S2 are respectively connected to the first end of the main contact KA1 of the first relay and the first end of the main contact KA2 of the second relay, the second end of the main contact KA1 of the first relay and the second end of the main contact KA2 of the second relay are connected together to connect to the second output end of the voltage sag protector 200.

[0070] In the embodiments of the present application, the type of voltage sag protector is not specifically limited. For example, the voltage sag protector may be a dynamic voltage regulator (DVR). The dynamic voltage regulator DVR obtains energy from the power grid through a converter when the voltage is abnormal, and provides a correction voltage through an inverter to ensure load voltage stability.

[0071] In the embodiments of this application, a voltage sag protector is introduced into the secondary circuit to record power outages, allowing operators to promptly monitor equipment shutdowns due to power outages and system recovery after power outages. This helps operators assess system stability and determine whether adjustments or improvements are necessary, such as adding anti-power-sag devices or optimizing equipment control logic. This ensures that the circulating water system maintains stable operation even in power outages, minimizing the impact on production processes.

[0072] Furthermore, the circulating water system in the embodiment of the present application may also include an emergency stop switch.

[0073] like Figure 4 As shown in FIG. 1 , in the inverter circuit, the common terminal COM of the inverter is connected to the emergency stop terminal E-STOP of the inverter through the emergency stop switch JT.

[0074] It should be noted that the emergency stop terminal E-STOP described in the embodiment of the present application can be configured according to user needs, that is, the DI terminal for introducing the emergency stop signal into the inverter is defined as the emergency stop terminal.

[0075] For example, the emergency stop switch in the embodiment of the present application can be triggered by a physical button (such as an emergency stop button) or other operating devices (such as a pull rope, a handle), and usually has a red operating component and a yellow background for quick identification.

[0076] like Figure 5 As shown, in the secondary circuit, the first end of the emergency stop switch JT is connected to the first output end of the voltage sag protector 100, and the second end of the emergency stop switch JT is connected to the first end of the first switching device S1 and the first end of the second switching device S2.

[0077] The circulating water system in the embodiment of the present application is equipped with an emergency stop switch to quickly stop the equipment in an emergency, thereby ensuring the safety of people and equipment.

[0078] In addition, Figure 6 As shown, the secondary circuit in the embodiment of the present application may further include: a switching switch SA, a third switching device S3 and a fourth switching device S4.

[0079] Among them, the input end of the switching switch SA is connected to the second end of the emergency stop switch JT, the first output end of the switching switch SA is connected to the first end of the third switching device S3 and the first end of the fourth switching device S4, and the second output end of the switching switch SA is connected to the first end of the first switching device S1; the second end of the third switching device S3 is connected to the first end of the main contact KA2 of the second relay, and the second end of the fourth switching device S4 is connected to the first end of the main contact KA1 of the first relay.

[0080] Exemplarily, when the first output terminal of the switching switch is turned on, the third switching device is turned on, and the fourth switching device is turned on, the local control mode is switched; when the first output terminal of the switching switch is turned on, the third switching device is turned off, and the fourth switching device is turned off, the remote control mode is switched.

[0081] In the embodiment of the present application, by adding a switching switch, a third switching device and a fourth switching device, multiple control modes, namely local control mode and remote control mode, are supported, thereby increasing the control flexibility of the circulating water system.

[0082] Based on a circulating water system provided in the above embodiment, an embodiment of the present application further provides a control method for a circulating water system, wherein the circulating water system includes a frequency converter circuit and a secondary circuit; wherein the frequency converter circuit includes a frequency converter, auxiliary contacts of a first relay and auxiliary contacts of a second relay, and the frequency converter is configured to self-lock to start a normally open position and stop an inverse logic normally closed position; the secondary circuit includes a first switching device, a second switching device, a main contact of the first relay and a main contact of the second relay; in the frequency converter circuit, the common end of the frequency converter is connected to the start terminal of the frequency converter through the auxiliary contact of the first relay, and the common end of the frequency converter is connected to the stop terminal of the frequency converter through the auxiliary contact of the second relay; in the secondary circuit, the first end of the first switching device and the first end of the second switching device are respectively used to connect to the first end of the power supply, the second end of the first switching device and the second end of the second switching device are respectively connected to the first end of the main contact of the first relay and the first end of the main contact of the second relay, and the second end of the main contact of the first relay and the second end of the main contact of the second relay are respectively connected to the second end of the power supply;

[0083] like Figure 7 As shown, the method includes:

[0084] S710: Control the first switch device to be turned on, the main contact of the first relay to be closed, and the auxiliary contact of the first relay to be closed, so that the inverter starts in a self-locking manner.

[0085] S720: Control the second switch device to be turned on, the main contact of the second relay to be closed, and the auxiliary contact of the second relay to be disconnected, so as to stop the inverter.

[0086] In this embodiment of the present application, the inverter self-locks after startup, reducing the risk of inverter shutdown due to voltage sag, thereby improving the reliability of the circulating water system. Furthermore, in the event of an abnormal power surge, the inverter automatically resets and performs a flying start, unaffected by the secondary circuit. Because this embodiment of the present application eliminates the need for a backup power supply in the inverter's primary circuit, the cost of the circulating water system is reduced.

[0087] In a possible embodiment, the circulating water system further includes: a voltage sag protector; an input end of the voltage sag protector is used to connect to a power supply, a first output end of the voltage sag protector is connected to a first end of a first switching device and a first end of a second switching device, a second end of the first switching device and a second end of the second switching device are respectively connected to a first end of a main contact of the first relay and a first end of a main contact of the second relay, and a second end of the main contact of the first relay and a second end of the main contact of the second relay are connected together to connect to a second output end of the voltage sag protector.

[0088] In a possible embodiment, the circulating water system further includes: an emergency stop switch;

[0089] In the inverter circuit, the common end of the inverter is connected to the emergency stop terminal of the inverter through the emergency stop switch; in the secondary circuit, the first end of the emergency stop switch is connected to the first output end of the voltage sag protector, and the second end of the emergency stop switch is connected to the first end of the first switching device and the first end of the second switching device.

[0090] In a possible embodiment, the circulating water system further includes: an on-off switch, a third switch device, and a fourth switch device;

[0091] The input end of the switching switch is connected to the second end of the emergency stop switch, the first output end of the switching switch is connected to the first end of the third switching device and the first end of the fourth switching device, and the second output end of the switching switch is connected to the first end of the first switching device;

[0092] A second end of the third switching device is connected to a first end of the main contact of the second relay, and a second end of the fourth switching device is connected to a first end of the main contact of the first relay.

[0093] In a possible embodiment, the first output terminal of the switching switch indicates a local control mode, and the second output terminal of the switching switch indicates a remote control mode.

[0094] In a possible embodiment, the auxiliary contact of the first relay is a normally open contact, and the auxiliary contact of the second relay is a normally closed contact.

[0095] An embodiment of the present application provides a computer-readable storage medium having a computer program stored thereon. When the program is executed by a processor, the control method of the circulating water system described in the embodiment of the present application is implemented.

[0096] In practical applications, the computer-readable storage medium can adopt any combination of one or more computer-readable media. The computer-readable medium can be a computer-readable signal medium or a computer-readable storage medium. The computer-readable storage medium can be, for example, but not limited to, an electrical, magnetic, optical, electromagnetic, infrared, or semiconductor system, device or component, or any combination thereof. More specific examples (non-exhaustive list) of computer-readable storage media include: an electrical connection with one or more wires, a portable computer disk, a hard disk, a random access memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber, a portable compact disk read-only memory (CD-ROM), an optical storage device, a magnetic storage device, or any suitable combination thereof. In the present embodiment, the computer-readable storage medium can be any tangible medium containing or storing a program, which can be used by an instruction execution system, device or device or used in combination with it.

[0097] A computer-readable signal medium may include a data signal propagated in baseband or as part of a carrier wave, which carries computer-readable program code. Such propagated data signals may take various forms, including but not limited to electromagnetic signals, optical signals, or any suitable combination thereof. A computer-readable signal medium may also be any computer-readable medium other than a computer-readable storage medium that can transmit, propagate, or transport a program for use by or in conjunction with an instruction execution system, apparatus, or device.

[0098] Program code embodied on a computer readable medium may be transmitted using any appropriate medium, including but not limited to wireless, wireline, optical fiber cable, RF, etc., or any suitable combination of the foregoing.

[0099] The computer program code for performing the operations of the present invention may be written in one or more programming languages, or a combination thereof, including object-oriented programming languages such as Java, Smalltalk, C++, and conventional procedural programming languages such as "C" or similar programming languages. The program code may be executed entirely on the user's computer, partially on the user's computer, as a stand-alone software package, partially on the user's computer and partially on a remote computer, or entirely on a remote computer or server. In cases involving a remote computer, the remote computer may be connected to the user's computer through any type of network, including a local area network (LAN) or a wide area network (WAN), or may be connected to an external computer (e.g., through the Internet using an Internet service provider).

[0100] like Figure 8 As shown, this is a structural diagram of a computer device provided in an embodiment of the present application. Figure 8 The computer device 12 shown is merely an example and should not limit the functionality and scope of use of the embodiments of the present invention.

[0101] like Figure 8 As shown, computer device 12 is implemented as a general-purpose computing device. Components of computer device 12 may include, but are not limited to, one or more processors or processing units 16, system memory 28, and a bus 18 that connects various system components (including system memory 28 and processing unit 16).

[0102] Bus 18 represents one or more of several types of bus structures, including a memory bus or memory controller, a peripheral bus, an accelerated graphics port, a processor, or a local bus using any of a variety of bus architectures. Examples of these architectures include, but are not limited to, an Industry Standard Architecture (ISA) bus, a Micro Channel Architecture (MAC) bus, an Enhanced ISA bus, a Video Electronics Standards Association (VESA) local bus, and a Peripheral Component Interconnect (PCI) bus.

[0103] The computer device 12 typically includes a variety of computer system readable media. These media can be any available media that can be accessed by the computer device 12, including volatile and non-volatile media, removable and non-removable media.

[0104] System memory 28 may include computer system readable media in the form of volatile memory, such as random access memory (RAM) 30 and / or cache memory 32. Computer device 12 may further include other removable / non-removable, volatile / non-volatile computer system storage media. By way of example only, storage system 34 may be configured to read and write non-removable, non-volatile magnetic media ( Figure 8 Not shown, often called a "hard drive"). Although Figure 8 Not shown, a magnetic disk drive for reading and writing to a removable non-volatile magnetic disk (e.g., a "floppy disk"), and an optical disk drive for reading and writing to a removable non-volatile optical disk (e.g., a CD-ROM, DVD-ROM, or other optical media) may be provided. In these cases, each drive may be connected to bus 18 via one or more data media interfaces. Memory 28 may include at least one program product having a set (e.g., at least one) of program modules configured to perform the functions of various embodiments of the present invention.

[0105] A program / utility 40 having a set (at least one) of program modules 42 may be stored, for example, in memory 28. Such program modules 42 include, but are not limited to, an operating system, one or more application programs, other program modules, and program data, each of which, or some combination thereof, may include an implementation of a network environment. Program modules 42 generally implement the functions and / or methods of the embodiments described herein.

[0106] The computer device 12 may also communicate with one or more external devices 14 (e.g., a keyboard, a pointing device, a display 24, etc.), one or more devices that enable a user to interact with the computer device 12, and / or any device that enables the computer device 12 to communicate with one or more other computing devices (e.g., a network card, a modem, etc.). Such communication may occur through an input / output (I / O) interface 22. Furthermore, the computer device 12 may also communicate with one or more networks (e.g., a local area network (LAN), a wide area network (WAN), and / or a public network, such as the Internet) through a network adapter 20. Figure 8 As shown, the network adapter 20 communicates with the other modules of the computer device 12 via the bus 18. Figure 8 Not shown, other hardware and / or software modules may be used in conjunction with computer device 12, including but not limited to microcode, device drivers, redundant processing units, external disk drive arrays, RAID systems, tape drives, and data backup storage systems.

[0107] The processor unit 16 executes various functional applications and data processing by running programs stored in the system memory 28, such as implementing the control method of the circulating water system provided in the embodiment of the present application.

[0108] The above is merely one specific embodiment of the present application, but the scope of protection of the present application is not limited thereto. Any changes or substitutions that can be easily conceived by a person skilled in the art within the technical scope disclosed in this application should be included in the scope of protection of the present application. Therefore, the scope of protection of the present application should be based on the scope of protection of the claims.

Claims

1. A circulating water system, characterized in that: include: A frequency converter circuit and a secondary circuit; wherein the frequency converter circuit includes a frequency converter, auxiliary contacts of a first relay, and auxiliary contacts of a second relay, and the frequency converter is configured to self-lock to start a normally open position and stop a normally closed position with inverse logic; the secondary circuit includes a first switching device, a second switching device, a main contact of the first relay, and a main contact of the second relay; In the inverter circuit, the common terminal of the inverter is connected to the start terminal of the inverter through the auxiliary contact of the first relay, and the common terminal of the inverter is connected to the stop terminal of the inverter through the auxiliary contact of the second relay; In the secondary circuit, the first end of the first switching device and the first end of the second switching device are respectively used to connect to the first end of the power supply, the second end of the first switching device and the second end of the second switching device are respectively connected to the first end of the main contact of the first relay and the first end of the main contact of the second relay, and the second end of the main contact of the first relay and the second end of the main contact of the second relay are respectively connected to the second end of the power supply.

2. The circulating water system according to claim 1, characterized in that: Also includes: Controller; The controller is configured to control the first switching device to be turned on, the main contact of the first relay to be closed, and the auxiliary contact of the first relay to be closed, so that the inverter starts in a self-locking manner.

3. The circulating water system according to claim 1, characterized in that: Also includes: Controller; The controller is configured to control the second switch device to be turned on, the main contact of the second relay to be attracted, and the auxiliary contact of the second relay to be disconnected, so as to shut down the inverter.

4. The circulating water system according to any one of claims 1 to 3, characterized in that: Also includes: Emergency stop switch; In the inverter circuit, the common end of the inverter is connected to the emergency stop terminal of the inverter through the emergency stop switch; In the secondary circuit, a first end of the emergency stop switch is connected to a first end of the power supply, and a second end of the emergency stop switch is connected to a first end of the first switching device and a first end of the second switching device.

5. The circulating water system according to claim 4, characterized in that: Also includes: a switching switch, a third switching device, and a fourth switching device; The input end of the switching switch is connected to the second end of the emergency stop switch, the first output end of the switching switch is connected to the first end of the third switching device and the first end of the fourth switching device, and the second output end of the switching switch is connected to the first end of the first switching device; A second end of the third switching device is connected to a first end of a main contact of the second relay, and a second end of the fourth switching device is connected to a first end of a main contact of the first relay.

6. The circulating water system according to claim 5, characterized in that: The first output terminal of the switching switch indicates a local control mode, and the second output terminal of the switching switch indicates a remote control mode.

7. The circulating water system according to any one of claims 1 to 3, characterized in that: The auxiliary contact of the first relay is a normally open contact, and the auxiliary contact of the second relay is a normally closed contact.

8. A method for controlling a circulating water system, characterized in that: The circulating water system includes a frequency converter circuit and a secondary circuit; wherein the frequency converter circuit includes a frequency converter, auxiliary contacts of a first relay and auxiliary contacts of a second relay, and the frequency converter is configured to be self-locked to start a normally open position and stop a normally closed position with inverse logic; the secondary circuit includes a first switching device, a second switching device, a main contact of the first relay and a main contact of the second relay; in the frequency converter circuit, the common end of the frequency converter is connected to the start terminal of the frequency converter through the auxiliary contact of the first relay, and the common end of the frequency converter is connected to the stop terminal of the frequency converter through the auxiliary contact of the second relay; in the secondary circuit, the first end of the first switching device and the first end of the second switching device are respectively used to connect to the first end of the power supply, the second end of the first switching device and the second end of the second switching device are respectively connected to the first end of the main contact of the first relay and the first end of the main contact of the second relay, and the second end of the main contact of the first relay and the second end of the main contact of the second relay are respectively connected to the second end of the power supply; Methods include: Controlling the first switch device to be turned on, the main contact of the first relay to be attracted, and the auxiliary contact of the first relay to be attracted, so that the inverter starts in a self-locking manner; The second switch device is controlled to be turned on, the main contact of the second relay is controlled to be closed, and the auxiliary contact of the second relay is controlled to be disconnected, so as to shut down the frequency converter.

9. A computer device, characterized in that: include: a memory having a computer program stored thereon; A processor is used to execute the computer program in the memory to implement the steps of the control method of the circulating water system according to claim 8.

10. A computer-readable storage medium having a computer program stored thereon, characterized in that: When the computer program is executed by a processor, the steps of the method for controlling the circulating water system according to claim 8 are implemented.

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