A control method for automatic switching of variable frequency water pump drive mode and a chiller unit
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- GREE ELECTRIC APPLIANCE INC OF ZHUHAI
- Filing Date
- 2025-06-03
- Publication Date
- 2026-07-17
Smart Images
Figure CN120759747B_ABST
Abstract
Description
Technical Field
[0001] This invention relates to the field of variable frequency chiller technology, and in particular to a control method for automatic switching of variable frequency water pump drive mode and a chiller unit. Background Technology
[0002] Currently, in actual operation, the noise level generated by the built-in water pump of variable frequency chillers is significantly higher than the noise level produced by the chiller itself, affecting user experience. Abnormal pump noise may cause wear and tear on internal parts, increasing the chiller's failure rate. Summary of the Invention
[0003] To address the shortcomings of existing technologies, this invention provides a control method for automatic switching of variable frequency water pump drive modes and a chiller unit, thereby solving the technical problem of abnormal water pump noise in existing technologies.
[0004] The present invention adopts the following technical solution.
[0005] The first aspect of the present invention provides a control method for automatic switching of variable frequency water pump drive mode, comprising the following steps:
[0006] The operating frequency range of the variable frequency compressor is set at the first predetermined frequency boundary point f. C,middle The frequency range of the variable frequency pump is divided into a first low-frequency range and a first high-frequency range, and the operating frequency range of the pump is set to the second set frequency boundary point f. P,middle It is divided into a second low-frequency range and a second high-frequency range;
[0007] If the variable frequency compressor is detected to be operating in the first low-frequency range and the variable frequency water pump is detected to be operating in the second low-frequency range, then the operation drive of the variable frequency water pump will be switched to the drive board and operated at the set carrier frequency f. low Continue with input transmission and processing;
[0008] If the variable frequency compressor is detected to be operating in the first high frequency range and the variable frequency water pump is detected to be operating in the second high frequency range, then the operation drive of the variable frequency water pump will be switched to the inverter drive and operate at the set carrier frequency f. high Continue with input transmission and processing.
[0009] Preferably, the set carrier frequency f is obtained. low The process includes:
[0010] The variable frequency water pump operates in the second low-frequency range. The pump's operation is driven by a driver board. The driver board's built-in module selects multiple carrier frequencies, which are then connected sequentially. Noise levels are detected at each carrier frequency, and these noise levels are compared horizontally. The driver board's built-in module then selects the carrier frequency f with the lowest noise level. low Continue with input transmission and processing.
[0011] Preferably, the variable frequency water pump operates in the second low-frequency range, and the built-in module of the drive board selects the third carrier frequency f. a After being connected and running stably for a set time t, a noise value N was detected. a ;
[0012] The driver board's built-in module selects the fourth carrier frequency f. b And access, fourth carrier frequency f b Unlike the third carrier frequency f a After stable operation for a set time t, a noise value N was detected. b ;
[0013] Compare noise values N a and noise value N b If the noise value N a Less than the noise value N b The driver board's built-in module selects the third carrier frequency f. a The carrier frequency f for continuing input transmission and processing low If the noise value N a Equal to noise value N a The driver board's built-in module selects the third carrier frequency f. a Or the fourth carrier frequency f b The carrier frequency f for continuing input transmission and processing low If the noise value N a Greater than the noise value N b The driver board's built-in module selects the fourth carrier frequency f. b The carrier frequency f for continuing input transmission and processing low .
[0014] Preferably, the set carrier frequency f is obtained. high The process includes:
[0015] The variable frequency water pump is driven by the frequency converter. The pump operates in the second high-frequency range. The frequency converter's built-in drive module selects multiple carrier frequencies and connects them sequentially. Noise levels are detected at each carrier frequency, and these noise levels are compared horizontally. The frequency converter's built-in drive module then selects the carrier frequency f with the lowest noise level. high Continue with input transmission and processing.
[0016] Preferably, each time the chiller unit is started, it performs an operation to acquire the set carrier frequency f. low Or carrier frequency f high The process, and with the newly acquired carrier frequency f low Or carrier frequency f high Continue with input transmission and processing.
[0017] Preferably, if the variable frequency compressor is detected to be operating in the first low frequency range (10-50Hz) and the variable frequency water pump is detected to be operating in the second low frequency range (0-20Hz), then the operation drive of the variable frequency water pump is switched to the drive of the connected drive board.
[0018] If the variable frequency compressor is detected to be operating in the first high frequency zone of 51-90Hz and the second high frequency zone of 21-40Hz, the operation drive of the variable frequency water pump will be switched to the drive connected to the variable frequency drive.
[0019] A second aspect of the present invention provides a chiller unit that operates according to a control method for automatically switching the drive mode of a variable frequency water pump as described in the first aspect, comprising:
[0020] Variable frequency compressor, variable frequency water pump, and an external water pump drive module for detecting the operating frequency of the variable frequency compressor and variable frequency water pump;
[0021] The external water pump drive module automatically switches the operation drive of the variable frequency water pump to the access drive board drive or the frequency converter drive based on the detected real-time operating frequency of the variable frequency compressor and the variable frequency water pump, and continues to perform input transmission and processing at the set carrier frequency.
[0022] Preferably, the chiller unit further includes:
[0023] Sound level meters are used to detect the overall noise level of water turbine units;
[0024] The sound level meter sends the noise level of the entire water turbine unit to the external water pump drive module, which then selects the carrier frequency with the lowest noise level based on the noise levels at different carrier frequencies.
[0025] A third aspect of the present invention provides an electronic device, including a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the computer program, when loaded onto the processor, implements a control method for automatically switching the variable frequency water pump drive mode according to the first aspect.
[0026] A fourth aspect of the present invention provides a storage medium storing a computer program, characterized in that, when the computer program is executed by a processor, it implements a control method for automatically switching the drive mode of a variable frequency water pump as described in the first aspect.
[0027] Compared with the prior art, the beneficial effects of the present invention include at least the following: The present invention solves the problem of abnormal noise from the variable frequency water pump of the chiller unit by controlling the system's variable frequency water pump. This reduces the overall noise of the chiller unit, improves its energy efficiency, helps solve the problem of excessive noise during chiller unit operation, promotes stable operation of the chiller unit, and ensures user comfort. Attached Figure Description
[0028] Figure 1 This is a flowchart of the present invention;
[0029] Figure 2 This is a system schematic diagram of the chiller unit of the present invention.
[0030] In the diagram: 1. Variable frequency compressor; 2. Condenser; 3. Electronic expansion valve; 4. Evaporator; 5. Variable frequency water pump; 6. External water pump drive module; 7. Oil separator; 8. Vapor-liquid separator; 9. Variable frequency fan; 10. Humidity sensor. Detailed Implementation
[0031] To make the objectives, technical solutions, and advantages of this invention clearer, the technical solutions of this invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of this invention. The embodiments described in this application are merely some embodiments of this invention, and not all embodiments. Based on the spirit of this invention, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this invention.
[0032] In the description of this invention, it should be understood that the terms "center," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, 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 invention.
[0033] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this invention, "a plurality of" means two or more, unless otherwise explicitly specified.
[0034] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a communication connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.
[0035] Embodiment 1 of the present invention provides a control method for automatic switching of variable frequency water pump drive mode, comprising the following steps:
[0036] The operating frequency range of the variable frequency compressor during operation [f] C,min ,f C,max At the first set frequency boundary point f C,middle Divided into the first low-frequency range [f C,min ,f C,middle ] and the first high-frequency range (f C,middle ,f C,max The operating frequency range of the variable frequency water pump during operation is [f] P,min ,f P,max At the second set frequency boundary point f P,middle Divided into the second low frequency range [f P,min ,f P,middle ] and the second high frequency range (f P,middle ,f P,max ];
[0037] If the variable frequency compressor 1 is detected to be operating in the first low frequency range [f] C,min ,f C,middle ], the variable frequency water pump 5 in the second low frequency range [f P,min ,f P,middle When the variable frequency water pump 5 is running, its operation is switched to the drive board and operates at the set carrier frequency f. low Continue with input transmission and processing;
[0038] If it is detected that the variable frequency compressor 1 is operating in the first high frequency range (f C,middle ,f C,max ], the variable frequency water pump 5 in the second high frequency range (f P,middle ,f P,max When the variable frequency water pump 5 is running, its operation drive is switched to the inverter drive and operates at the set carrier frequency f. high Continue with input transmission and processing.
[0039] like Figure 1 , 2 As shown, Embodiment 2 of the present invention provides a control method for automatic switching of variable frequency water pump drive modes. As one of the prominent substantive features of the present invention, Embodiment 2 provides switching drive modes and obtaining the set carrier frequency f. low f high The preferred technical means.
[0040] Specifically, the control method includes the following steps:
[0041] Step 1: During the commissioning period, before starting the variable frequency chiller unit, simulate the customer's requirements and calculate the total load. From this, the operating frequency of the corresponding variable frequency compressor 1 and variable frequency water pump 5 can be obtained.
[0042] Step 2: Set the operating frequency range of the variable frequency compressor 1 [f] C,min ,f C,max At the first set frequency boundary point f C,middle Divided into the first low-frequency range [f C,min ,f C,middle ] and the first high-frequency range (f C,middle ,f C,max ], where f C,min f C,max These are the lower and upper limits of the operating frequency of the variable frequency compressor 1, respectively.
[0043] Similarly, the operating frequency range of the variable frequency water pump 5 during operation [f] P,min ,f P,max At the second set frequency boundary point f P,middle Divided into the second low frequency range [f P,min ,f P,middle ] and the second high frequency range (f P,middle ,f P,max ], where f P,min f P,max These are the lower and upper limits of the operating frequency of the variable frequency water pump 5, respectively.
[0044] If the total load requires the variable frequency compressor 1 to operate in the first low frequency range [f] C,min ,f C,middle Continue with step 3;
[0045] If the total load requires the variable frequency compressor 1 to operate in the first high frequency range (f) C,middle ,f C,max Continue with step 4.
[0046] Step 3: Variable frequency water pump 5 in the second low frequency range [f P,min ,f P,middle The variable frequency water pump 5 is driven by the drive board. The drive board's built-in module selects multiple carrier frequencies and connects them sequentially. After stable operation for a set time t at each carrier frequency, noise values are detected. The noise values are compared horizontally, and the drive board's built-in module selects the carrier frequency f with the lowest noise value. low Continue with input transmission and processing.
[0047] Preferably, but not limitingly, step 3 specifically includes:
[0048] Step 3.1: Variable frequency water pump 5 in the second low frequency range [fP,min ,f P,middle [Running, the driver board's built-in module selects the third carrier frequency f] a After being connected and running stably for a set time t, a noise value N was detected. a .
[0049] Step 3.2: Variable frequency water pump 5 in the second low frequency range [f P,min ,f P,middle [Running, the driver board's built-in module selects the fourth carrier frequency f] b And access, fourth carrier frequency f b Unlike the third carrier frequency f a Stable operation
[0050] Step 3.3: Compare noise values N a and noise value N b If the noise value N a Less than the noise value N b The driver board's built-in module selects the third carrier frequency f. a The carrier frequency f for continuing input transmission and processing low If the noise value N a Equal to noise value N a The driver board's built-in module selects the third carrier frequency f. a Or the fourth carrier frequency f b The carrier frequency f for continuing input transmission and processing low If the noise value N a Greater than the noise value N b The driver board's built-in module selects the fourth carrier frequency f. b The carrier frequency f for continuing input transmission and processing low .
[0051] Step 4: The variable frequency water pump 5 is driven by the frequency converter, and the variable frequency water pump 5 operates in the second high frequency range (f P,middle ,f P,max During operation, the inverter's built-in drive module selects multiple carrier frequencies and connects them sequentially. After stable operation for a set time t at each carrier frequency, noise levels are detected. These noise levels are then compared horizontally, and the inverter's built-in drive module selects the carrier frequency f with the lowest noise level. high Continue with input transmission and processing.
[0052] Preferably, but not limitingly, step 4 specifically includes:
[0053] Step 4.1: Variable frequency water pump 5 in the second high frequency range (f P,middle ,f P,max [Running, the inverter's built-in drive module selects the first carrier frequency f] AAfter being connected and running stably for a set time t, a noise value N was detected. A .
[0054] Step 4.2: Variable frequency water pump 5 in the second high frequency range (f P,middle ,f P,max [Running, the inverter's built-in drive module selects the second carrier frequency f] B And access, the second carrier frequency f B Unlike the first carrier frequency f A After running stably for a set time t, a noise value N was detected. B .
[0055] Step 4.3: Compare noise values N A and noise value N B If the noise value N A Less than the noise value N B The inverter's built-in drive module selects the first carrier frequency f. A The carrier frequency f for continuing input transmission and processing high If the noise value N A Equal to noise value N B The inverter's built-in drive module selects the first carrier frequency f. A Or the second carrier frequency f B The carrier frequency f for continuing input transmission and processing high If the noise value N A Greater than the noise value N B The inverter's built-in drive module selects the second carrier frequency f. B The carrier frequency f for continuing input transmission and processing high .
[0056] It is worth noting that in both steps 3 and 4, multiple carrier frequencies can be set for lateral noise comparison, and the carrier frequency with the lowest noise value can be selected. The number of carrier frequencies for lateral comparison in steps 3 and 4 can be the same or different. In the above preferred but non-limiting embodiments, two carrier frequencies have been described in detail. However, it is understood that when the unit operates at low frequency, the noise itself is not large, and only two sets of reference numbers need to be compared. When the unit operates at high frequency, either two sets of reference numbers can be used, or multiple sets of reference numbers can be compared.
[0057] Step 5: During normal operation, after the variable frequency chiller unit is started, according to the set working mode, the external water pump drive module 6 first detects the real-time operating frequency f of the variable frequency compressor 1. C,t and the operating frequency f of the variable frequency water pump 5 P,t ;
[0058] According to the real-time operating frequency f of variable frequency compressor 1C,t The first low-frequency range [f] C,min ,f C,middle or the first high-frequency range (f) C,middle ,f C,max The real-time operating frequency f of the variable frequency water pump 5 P,t Corresponding to the second low frequency range [f P,min ,f P,middle or the second high-frequency range (f) P,middle ,f P,max ];
[0059] The operation drive of the variable frequency water pump 5 is connected to the drive board or the frequency converter drive. The built-in module of the drive board uses a carrier frequency f. low Execute input transmission and processing or use the inverter's built-in drive module at carrier frequency f high Perform input transmission and processing.
[0060] As one of the most prominent substantive features of this invention and a significant advancement over the prior art, this invention discloses the following technical content: In engineering practice, when a variable frequency water pump operates in the high-frequency range, the overall noise of the water pump and unit driven by the frequency converter is significantly lower than the overall noise of the unit driven by the drive board; conversely, when a variable frequency water pump operates in the low-frequency range, the overall noise of the water pump and unit driven by the frequency converter is significantly higher than the overall noise of the unit driven by the drive board.
[0061] Therefore, the present invention provides a technical concept for an external drive module device to first detect the operating frequency of the variable frequency compressor and select the corresponding variable frequency water pump drive control mode based on the feedback of the compressor operating frequency.
[0062] Furthermore, this invention also reveals that when the compressor of the unit is operating at a high frequency, the frequency of the variable frequency water pump is also operating at a high frequency. Under the above-mentioned technical concept of selecting the appropriate variable frequency water pump drive control method, the total load is detected and calculated before startup, thereby obtaining the corresponding operating frequencies of the compressor and water pump. This is used to simulate and test customer requirements, and to specifically optimize the carrier frequencies of the built-in drive modules of the drive board and the built-in drive modules of the inverter in the low-frequency and high-frequency ranges, respectively.
[0063] Therefore, by dividing the operating frequency ranges of both the variable frequency compressor 1 and the variable frequency water pump 5 into low-frequency and high-frequency ranges, it is possible to more quickly optimize the carrier frequency for reducing overall noise. That is, the variable frequency compressor 1 operates in the first low-frequency range [f C,min ,f C,middle When [f], the variable frequency water pump 5 operates in the second low frequency range. P,min ,f P,middle [f] This only optimizes the carrier frequency for which the driver board's built-in module can reduce noise, and does not need to target the entire operating frequency range.P,min ,f P,max The carrier frequency is optimized; the same principle applies to optimizing the carrier frequency for the inverter's built-in drive module to reduce noise.
[0064] Furthermore, the present invention can either optimize the carrier frequency to reduce noise once after each power-on, or optimize it in advance based on the needs of simulated customer scenarios before the air conditioner leaves the factory, and automatically switch the drive mode and carrier frequency after each power-on.
[0065] To more clearly illustrate the outstanding substantive features of this invention and the significant advancements it brings to the prior art, an application example of implementing this invention is described below. Embodiment 3 of this invention discloses a control method for automatic switching of variable frequency water pump drive modes, comprising the following steps:
[0066] Step 1: During the commissioning period, before starting the variable frequency chiller unit, simulate the customer's requirements and calculate the total load. From this, the operating frequency of the corresponding variable frequency compressor 1 and variable frequency water pump 5 can be obtained.
[0067] Step 2: Divide the operating frequency range (10-90Hz) of the variable frequency compressor into high and low frequency ranges, where the first low frequency range is 10-50Hz and the first high frequency range is 51-90Hz.
[0068] The operating frequency range of the variable frequency water pump (0-40Hz) is divided into high and low frequency ranges, with the second low frequency range being 0-20Hz and the second high frequency range being 21-40Hz.
[0069] If the total load requires the variable frequency compressor 1 to operate in the first low frequency range of 10-50Hz, continue to execute step 3;
[0070] If the total load requires the variable frequency compressor 1 to operate in the first high frequency range of 51-90Hz, continue to step 4.
[0071] Step 3: When the compressor of the unit is in the low frequency range, the frequency of the variable frequency water pump is also in the low frequency range. The variable frequency water pump 5 operates in the second low frequency range of 0-20Hz, and the water pump operation drive is connected to the drive board.
[0072] First, connect to different carrier frequencies f. a f b Each ran stably for 10 minutes.
[0073] Then, the magnitude of the contrast noise value is detected to determine the input carrier frequency f. a or f b Specifically, when accessing f a At that time, the noise value recorded by the detection was N. a When accessing fb At that time, the noise value recorded by the detection was N. b If the noise value is N a Less than the noise value N b At this point, it is based on the carrier frequency f. a Input transmission and processing. If the noise value is N... a The noise value is greater than N b At this point, it is based on the carrier frequency f. b Input transmission and processing. If the noise value is N... a The noise value is equal to N b At this point, both carrier frequencies can be input for transmission and processing.
[0074] Step 4: When the compressor of the unit is in the high frequency range, the frequency of the variable frequency water pump is also in the high frequency range. The variable frequency water pump 5 operates in the second high frequency range of 21-40Hz, and the water pump operation drive is connected to the frequency converter drive.
[0075] First, connect to different carrier frequencies f. A f B Each ran stably for 10 minutes.
[0076] Then, the magnitude of the contrast noise value is detected to determine the input carrier frequency f. A or f B Specifically, when accessing f A At that time, the noise value recorded by the detection was N. A When accessing f B At that time, the noise value recorded by the detection was N. B If the noise value is N A Less than the noise value N B At this point, it is based on the carrier frequency f. A Input transmission and processing. If the noise value is N... A The noise value is greater than N B At this point, it is based on the carrier frequency f. B Input transmission and processing. If the noise value is N... A The noise value is equal to N B At this point, both carrier frequencies can be input for transmission and processing.
[0077] Step 5: During normal operation, after the variable frequency chiller unit is turned on, according to the set working mode, taking the cooling mode as an example, the external water pump drive module 6 first detects the real-time operating frequency f of the variable frequency compressor 1. C,t and the operating frequency f of the variable frequency water pump 5 P,t ;
[0078] According to the real-time operating frequency f of variable frequency compressor 1 C,tThe real-time operating frequency f of the variable frequency water pump 5 is located in the first low-frequency range of 10-50Hz or the first high-frequency range of 51-90Hz. P,t This corresponds to the second low-frequency range of 0-20Hz or the second high-frequency range of 21-40Hz.
[0079] The operation drive of the variable frequency water pump 5 automatically switches between the corresponding drive board drive and the inverter drive. The built-in module of the drive board operates at the carrier frequency f determined in step 3. a or f b Perform input transmission and processing, or the inverter's built-in drive module operates at the carrier frequency f determined in step 4. A or f B Perform input transmission and processing.
[0080] Embodiment 4 of the present invention provides a chiller unit that operates the automatic switching control method for the variable frequency water pump drive mode described in Embodiment 1. The chiller unit includes: a variable frequency compressor 1, a condenser 2, an electronic expansion valve 3, and an evaporator 4 connected in a closed loop via pipelines.
[0081] The evaporator 4 is connected to a variable frequency water pump 5, which is electrically connected to an external water pump drive module 6. The external water pump drive module 6 is used to detect the operating frequency of the variable frequency compressor and the operating frequency of the variable frequency water pump, determine whether the variable frequency compressor 1 is in the high frequency zone or the low frequency zone, realize the automatic switching of the drive mode of the variable frequency water pump 5, and determine its own input carrier frequency.
[0082] In a preferred but non-limiting embodiment of the present invention, the external water pump drive module 6 includes a frequency converter and a drive board. The frequency converter is used to drive the variable frequency water pump 5 when it is running in the high frequency range, and the drive board is used to drive the variable frequency water pump 5 when it is running in the low frequency range.
[0083] Preferably, the driver board has a built-in driver module that sets different carrier input frequencies f. A or f B The inverter's built-in drive module can be configured with different carrier input frequencies f. a or f b .
[0084] The chiller unit also includes a sound level meter for detecting the noise of the entire chiller unit; the sound level meter sends the noise value of the entire chiller unit to an external water pump drive module, which is used by the external water pump drive module to select the carrier frequency with the lowest noise value based on the noise value at different carrier frequencies.
[0085] Preferably, a vapor-liquid separator 8 is installed on the pipeline between the evaporator and the compressor, and an oil separator 7 is installed on the pipeline between the variable frequency compressor and the condenser.
[0086] Preferably, one end of the bypass pipeline is connected between the variable frequency compressor 1 and the vapor-liquid separator 8, and the other end is connected to the oil separator 7.
[0087] Preferably, a variable frequency fan 9 and a humidity sensor 10 are installed on the condenser 2.
[0088] Embodiment 5 of the present invention provides an electronic device, including a memory, a processor, and a computer program stored in the memory and executable on the processor. When the computer program is loaded onto the processor, it implements the control method for automatic switching of the variable frequency water pump drive mode according to Embodiments 1, 2, or 3.
[0089] Embodiment 6 of the present invention provides a storage medium storing a computer program, which, when executed by a processor, implements a control method for automatic switching of variable frequency water pump drive mode as described in Embodiments 1, 2 or 3.
[0090] Compared with the prior art, the beneficial effects of the present invention include at least the following: The present invention solves the problem of abnormal noise from the variable frequency water pump of the chiller unit by controlling the system's variable frequency water pump. This reduces the overall noise of the chiller unit, improves its energy efficiency, helps solve the problem of excessive noise during chiller unit operation, promotes stable operation of the chiller unit, and ensures user comfort.
[0091] This disclosure can be a system, method, and / or computer program product. A computer program product may include a computer-readable storage medium having computer-readable program instructions loaded thereon for causing a processor to implement various aspects of this disclosure.
[0092] Computer-readable storage media can be tangible devices capable of holding and storing instructions for use by an instruction execution device. Computer-readable storage media can be, for example, but not limited to, electrical storage devices, magnetic storage devices, optical storage devices, electromagnetic storage devices, semiconductor storage devices, or any suitable combination thereof. More specific examples (a non-exhaustive list) of computer-readable storage media include: portable computer disks, hard disks, random access memory (RAM), read-only memory (ROM), erasable programmable read-only memory (EPROM or flash memory), static random access memory (SRAM), portable compact disc read-only memory (CD-ROM), digital multifunction disc (DVD), memory sticks, floppy disks, mechanical encoding devices, such as punch cards or recessed protrusions storing instructions thereon, and any suitable combination thereof. The computer-readable storage media used herein are not to be construed as transient signals themselves, such as radio waves or other freely propagating electromagnetic waves, electromagnetic waves propagating through waveguides or other transmission media (e.g., light pulses through fiber optic cables), or electrical signals transmitted through wires.
[0093] The computer-readable program instructions described herein can be downloaded from computer-readable storage media to various computing / processing devices, or downloaded via a network, such as the Internet, local area network, wide area network, and / or wireless network, to an external computer or external storage device. The network may include copper transmission cables, fiber optic transmission, wireless transmission, routers, firewalls, switches, gateway computers, and / or edge servers. A network adapter card or network interface in each computing / processing device receives the computer-readable program instructions from the network and forwards them to the computer-readable storage media in the respective computing / processing device.
[0094] Computer program instructions used to perform the operations of this disclosure may be assembly instructions, instruction set architecture (ISA) instructions, machine instructions, machine-dependent instructions, microcode, firmware instructions, status setting data, or source code or object code written in any combination of one or more programming languages, including object-oriented programming languages such as Smalltalk, C++, etc., and conventional procedural programming languages such as the "C" language or similar programming languages. The computer-readable program instructions may execute entirely on the user's computer, partially on the user's computer, as a standalone 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 via 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., via the Internet using an Internet service provider). In some embodiments, electronic circuitry, such as programmable logic circuitry, field-programmable gate arrays (FPGAs), or programmable logic arrays (PLAs), is personalized by utilizing the status information of the computer-readable program instructions to implement various aspects of this disclosure.
[0095] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and not to limit it. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art should understand that modifications or equivalent substitutions can still be made to the specific implementation of the present invention. Any modifications or equivalent substitutions that do not depart from the spirit and scope of the present invention should be covered within the protection scope of the claims of the present invention.
Claims
1. A control method for automatic switching of variable frequency water pump drive modes, characterized in that, Includes the following steps: The operating frequency range of the variable frequency compressor (1) is set at the first set frequency boundary point f. C,middle Dividing the frequency range into a first low-frequency range and a first high-frequency range, the operating frequency range of the variable frequency pump (5) is set at the second set frequency boundary point f. P,middle It is divided into a second low-frequency range and a second high-frequency range; If the variable frequency compressor (1) is detected to be operating in the first low frequency range and the variable frequency water pump (5) is operating in the second low frequency range, then the operation drive of the variable frequency water pump (5) is switched to the drive of the access drive board, and the set carrier frequency f is used. low Continue with input transmission and processing; If it is detected that the variable frequency compressor (1) is operating in the first high frequency range and the variable frequency water pump (5) is operating in the second high frequency range, then the operation drive of the variable frequency water pump (5) is switched to the inverter drive and operates at the set carrier frequency f. high Continue with input transmission and processing.
2. The control method for automatic switching of variable frequency water pump drive mode according to claim 1, characterized in that: Get the set carrier frequency f low The process includes: The variable frequency water pump (5) operates in the second low frequency range. The operation drive of the variable frequency water pump (5) is connected to the drive board. The built-in module of the drive board selects multiple carrier frequencies and connects them sequentially. Under each carrier frequency, the noise value is detected. The noise values are compared laterally, and the built-in module of the drive board selects the carrier frequency f with the lowest noise value. low Continue with input transmission and processing.
3. The control method for automatic switching of variable frequency water pump drive mode according to claim 1, characterized in that: The variable frequency water pump (5) operates in the second low frequency range, and the built-in module of the drive board selects the third carrier frequency f. a After being connected and running stably for a set time t, a noise value N was detected. a ; The driver board's built-in module selects the fourth carrier frequency f. b And access, fourth carrier frequency f b Unlike the third carrier frequency f a After stable operation for a set time t, a noise value N was detected. b ; Compare noise values N a and noise value N b If the noise value N a Less than the noise value N b The driver board's built-in module selects the third carrier frequency f. a The carrier frequency f for continuing input transmission and processing low If the noise value N a Equal to noise value N a The driver board's built-in module selects the third carrier frequency f. a Or the fourth carrier frequency f b The carrier frequency f for continuing input transmission and processing low If the noise value N a Greater than the noise value N b The driver board's built-in module selects the fourth carrier frequency f. b The carrier frequency f for continuing input transmission and processing low .
4. The control method for automatic switching of variable frequency water pump drive mode according to claim 2 or 3, characterized in that: Get the set carrier frequency f high The process includes: The variable frequency water pump (5) is driven by the inverter. The variable frequency water pump (5) operates in the second high frequency range. The inverter's built-in drive module selects multiple carrier frequencies and connects them sequentially. Noise values are detected at each carrier frequency. The noise values are compared laterally, and the inverter's built-in drive module selects the carrier frequency f with the lowest noise value. high Continue with input transmission and processing.
5. The control method for automatic switching of variable frequency water pump drive mode according to claim 4, characterized in that: Each time the chiller unit is started, it executes the process of acquiring the set carrier frequency f. low Or carrier frequency f high The process, and with the newly acquired carrier frequency f low Or carrier frequency f high Continue with input transmission and processing.
6. The control method for automatic switching of variable frequency water pump drive mode according to claim 1, characterized in that: If the variable frequency compressor (1) is detected to be operating in the first low frequency range of 10-50Hz and the variable frequency water pump (5) is operating in the second low frequency range of 0-20Hz, then the operation drive of the variable frequency water pump (5) will be switched to the drive of the connected drive board. If the variable frequency compressor (1) is detected to be operating in the first high frequency zone of 51-90Hz and the second high frequency zone of 21-40Hz, the operation drive of the variable frequency water pump (5) is switched to the drive of the connected frequency converter.
7. A chiller unit, operating with a control method for automatic switching of variable frequency water pump drive mode according to any one of claims 1-6, characterized in that, include: Variable frequency compressor (1), variable frequency water pump (5) and an external water pump drive module (6) for detecting the operating frequency of variable frequency compressor (1) and variable frequency water pump (5); The external water pump drive module (6) automatically switches the operation drive of the variable frequency water pump (5) to the access drive board drive or the frequency converter drive according to the real-time operating frequency of the detected variable frequency compressor (1) and variable frequency water pump (5), and continues to perform input transmission and processing at the set carrier frequency.
8. A chiller unit according to claim 7, characterized in that: The chiller unit also includes: Sound level meters are used to detect the overall noise level of water turbine units; The sound level meter sends the noise level of the entire water turbine unit to the external water pump drive module, which then selects the carrier frequency with the lowest noise level based on the noise levels at different carrier frequencies.
9. An electronic device comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, characterized in that, When the computer program is loaded into the processor, it implements the control method for automatic switching of the variable frequency water pump drive mode according to any one of claims 1 to 6.
10. A storage medium storing a computer program, characterized in that, When the computer program is executed by the processor, it implements a control method for automatic switching of variable frequency water pump drive mode according to any one of claims 1-6.