Control method for automatic switching of variable frequency water pump driving modes and water chilling unit

Abstract

The variable-frequency water pump driving mode automatic switching control method comprises the following steps that the total load capacity is detected and calculated before starting up, and the operation frequency of a variable-frequency compressor and the operation frequency of a variable-frequency water pump are obtained; after the water chilling unit is started, the external water pump driving module detects the operation frequency of the inverter compressor according to the set working mode; high and low frequency areas are divided according to the operation frequency of the inverter compressor, whether the inverter compressor is in the high frequency area or the low frequency area is judged according to the fed-back operation frequency of the inverter compressor, and frequency converter driving or driving board driving is selected to achieve automatic switching of variable-frequency water pump driving modes; the abnormal noise problem of the variable-frequency water pump of the water chilling unit is solved by controlling the variable-frequency water pump of the system. Therefore, the noise of the whole water chilling unit is reduced, the energy efficiency of the water chilling unit is improved, the problem that the noise of the whole water chilling unit exceeds the standard during operation is solved, stable operation of the water chilling unit is facilitated, and comfort of users is guaranteed.

Description

Technical Field

[0001] The present invention relates to the technical field of variable frequency chillers, and in particular to a control method for automatic switching of a variable frequency water pump drive mode and a chiller. Background Art

[0002] Currently, in actual operation, the noise level generated by the built-in water pump of a variable-frequency chiller is significantly higher than the noise level generated by the chiller itself, affecting user experience. Abnormal water pump noise can cause wear and tear on internal parts, increasing the failure rate of the chiller. Summary of the Invention

[0003] In order to solve the deficiencies in the prior art, the present invention provides a control method for automatic switching of variable frequency water pump drive modes and a chiller to solve the technical problem of abnormal water pump noise in the prior art.

[0004] The present invention adopts the following technical solutions.

[0005] A first aspect of the present invention provides a control method for automatic switching of a 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 set frequency dividing point f C,middle Divide into the first low frequency interval and the first high frequency interval, and set the operating frequency range of the variable frequency water pump at the second set frequency demarcation point f P,middle Divided into a second low frequency interval and a second high frequency interval;

[0007] If it is detected that the variable frequency compressor is running in the first low frequency range and the variable frequency water pump is running in the second low frequency range, the running drive of the variable frequency water pump is switched to the drive board and the set carrier frequency f is used. low Continue with input transfer and processing;

[0008] If it is detected that the variable frequency compressor is running in the first high frequency range and the variable frequency water pump is running in the second high frequency range, the running drive of the variable frequency water pump is switched to the inverter drive and operates at the set carrier frequency f high Input transfer and processing continues.

[0009] Preferably, the carrier frequency f is set to be obtained. low The process includes:

[0010] The variable frequency water pump runs in the second low frequency range. The running drive of the variable frequency water pump is connected to the driver board. The built-in module of the driver board selects multiple carrier frequencies and connects them in turn. Under each carrier frequency, the noise value is detected and compared horizontally. The built-in module of the driver board selects the carrier frequency f with the smallest noise value. low Input transfer and processing continues.

[0011] Preferably, the variable frequency water pump runs in the second low frequency interval, the drive board built-in module selects the third carrier frequency f a And access, stable operation for a set duration t, detect the noise value N a ;

[0012] The drive board built-in module selects the fourth carrier frequency f b And access, the fourth carrier frequency f b Different from the third carrier frequency f a , stable operation for a set duration t, detect the noise value N b ;

[0013] Compare the noise value N a And the noise value N b , if the noise value N a Less than the noise value N b , the drive board built-in module selects the third carrier frequency f a As the carrier frequency f low Continue to execute input transmission and processing; if the noise value N a Equal to the noise value N a , the drive board built-in module selects the third carrier frequency f a Or the fourth carrier frequency f b As the carrier frequency f low Continue to execute input transmission and processing; if the noise value N a Greater than the noise value N b , the drive board built-in module selects the fourth carrier frequency f b As the carrier frequency f low Continue to execute input transmission and processing.

[0014] Preferably, the process of obtaining the set carrier frequency f high Includes:

[0015] The variable frequency water pump runs to drive access to the frequency converter drive, the variable frequency water pump runs in the second high frequency interval, the frequency converter built-in drive module selects multiple carrier frequencies, in turn access, under each carrier frequency, detect the noise value, compare the noise values horizontally, the frequency converter built-in drive module selects the carrier frequency f high With the smallest noise value to continue to execute input transmission and processing.

[0016] Preferably, the water chiller executes the process of obtaining the set carrier frequency f low Or the carrier frequency f high Each time after starting, and continue to execute input transmission and processing with the newly obtained carrier frequency f low Or the carrier frequency f high .

[0017] Preferably, if it is detected that the variable frequency compressor is running in the first low frequency range of 10-50Hz and the variable frequency water pump is running in the second low frequency range of 0-20Hz, the running drive of the variable frequency water pump is switched to the drive board drive.

[0018] If it is detected that the variable frequency compressor is running in the first high frequency range of 51-90Hz and the second high frequency range of 21-40Hz, the operation drive of the variable frequency water pump is switched to the inverter drive.

[0019] A second aspect of the present invention provides a chiller, which operates a control method for automatically switching a variable frequency water pump drive mode according to the first aspect, comprising:

[0020] Variable frequency compressor, variable frequency water pump and 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 inverter drive according to the detected real-time operating frequency of the variable frequency compressor and variable frequency water pump, and continues to perform input transmission and processing at the set carrier frequency.

[0022] Preferably, the chiller further comprises:

[0023] Sound level meter, used to detect the noise of the water unit;

[0024] The sound level meter sends the noise value of the entire water unit to the external water pump driving module, so that the external water pump driving module selects the carrier frequency with the lowest noise value according to the noise values ​​at different carrier frequencies.

[0025] The third aspect of the present invention provides an electronic device, comprising a memory, a processor, and a computer program stored in the memory and executable on the processor. When the computer program is loaded into the processor, the control method for automatic switching of the variable frequency water pump drive mode according to the first aspect is implemented.

[0026] A fourth aspect of the present invention provides a storage medium storing a computer program, wherein the computer program, when executed by a processor, implements a control method for automatic switching of a variable frequency water pump drive mode according to the first aspect.

[0027] Compared with the existing technology, the present invention has at least the following beneficial effects: by controlling the system's variable frequency water pump, the present invention solves the problem of abnormal noise from the chiller's variable frequency water pump. This reduces the overall noise level of the chiller, improves the chiller's energy efficiency, and helps resolve the problem of excessive noise levels during chiller operation, thereby facilitating stable chiller operation and ensuring user comfort. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 is a flow chart of the present invention;

[0029] Figure 2 This is a system principle diagram of the chiller of the present invention.

[0030] In the figure: 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 DESCRIPTION

[0031] To make the objectives, technical solutions, and advantages of the present invention more clear, the technical solutions of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention. The embodiments described in this application are only part of the embodiments of the present invention, not all of them. Based on the spirit of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0032] In the description of the present invention, it should be understood that the terms "center", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "axial", "radial", "circumferential", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore cannot be understood as limiting the present 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 the technical features being referred to. Thus, a feature identified as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, "plurality" means two or more, unless otherwise specifically defined.

[0034] In the present invention, unless otherwise expressly specified or limited, terms such as "mounted," "connected," "connect," and "fixed" should be understood broadly. For example, they may refer to fixed connection, detachable connection, or integration; mechanical connection, electrical connection, or communication; direct connection or indirect connection through an intermediate medium; and internal communication between two components or interaction between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0035] Embodiment 1 of the present invention provides a control method for automatic switching of a variable frequency water pump drive mode, comprising the following steps:

[0036] The operating frequency range of the variable frequency compressor is [f C,min ,f C,max ] At the first set frequency demarcation point f C,middle Divided into the first low frequency interval [f C,min ,f C,middle ] and the first high frequency interval (f C,middle ,f C,max ], the operating frequency range of the variable frequency water pump is [f P,min ,f P,max ] At the second set frequency demarcation point f P,middle Divided into the second low frequency interval [f P,min ,f P,middle ] and the second high frequency interval (f P,middle ,f P,max ];

[0037] If it is detected that the variable frequency compressor 1 is operating in the first low frequency range [f C,min ,f C,middle ], the variable frequency water pump 5 is in the second low frequency range [f P,min ,f P,middle ] operation, the operation drive of the variable frequency water pump 5 is switched to the drive board drive, and the set carrier frequency f low Continue with input transfer 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 is in the second high frequency range (f P,middle ,f P,max ] operation, 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 Input transfer and processing continues.

[0039] like Figure 1 、 2 As shown, embodiment 2 of the present invention provides a control method for automatically switching the drive mode of a variable frequency water pump. As one of the outstanding essential features of the present invention, embodiment 2 of the present invention provides a method for switching the drive mode 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, simulate and test customer needs and detect and calculate the total load, thereby obtaining the operating frequencies of the corresponding variable frequency compressor 1 and variable frequency water pump 5.

[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 demarcation point f C,middle Divided into the first low frequency interval [f C,min ,f C,middle ] and the first high frequency interval (f C,middle ,f C,max ], where f C,min 、f C,max They are respectively the lower limit and upper limit of the operating frequency when the variable frequency compressor 1 is working.

[0043] Similarly, the operating frequency range of the variable frequency water pump 5 is [f P,min ,f P,max ] At the second set frequency demarcation point f P,middle Divided into the second low frequency interval [f P,min ,f P,middle ] and the second high frequency interval (f P,middle ,f P,max ], where f P,min 、f P,max They are respectively the lower limit and upper limit of the operating frequency of the variable frequency water pump 5 when it is working.

[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 ], proceed to 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 ], proceed to step 4.

[0046] Step 3: The variable frequency water pump 5 is in the second low frequency range [f P,min ,f P,middle ] operation, the operation drive of the variable frequency water pump 5 is connected to the driver board drive, the built-in module of the driver board selects multiple carrier frequencies, which are connected in sequence. Under each carrier frequency, after stable operation for the set time t, the noise value is detected, and the noise value is compared horizontally. The built-in module of the driver board selects the carrier frequency f with the smallest noise value. low Input transfer and processing continues.

[0047] Preferably but not limiting, step 3 specifically includes:

[0048] Step 3.1: The variable frequency water pump 5 is in the second low frequency range [fP,min ,f P,middle ] operation, the built-in module of the driver board selects the third carrier frequency f a And connected, after stable operation for the set time t, the noise value N is detected a .

[0049] Step 3.2: The variable frequency water pump 5 is in the second low frequency range [f P,min ,f P,middle ] operation, the driver board built-in module selects the fourth carrier frequency f b And access, the fourth carrier frequency f b Different from the third carrier frequency f a , stable operation

[0050] Step 3.3: Compare the noise value N a and noise value N b , if the noise value N a Less than the noise value N b , the built-in module of the driver board selects the third carrier frequency f a The carrier frequency f is used to continue the input transmission and processing low ; If the noise value N a Equal to the noise value N a , the built-in module of the driver board selects the third carrier frequency f a Or the fourth carrier frequency f b The carrier frequency f is used to continue the input transmission and processing low ; If the noise value N a Greater than the noise value N b , the built-in module of the driver board selects the fourth carrier frequency f b The carrier frequency f is used to continue the input transmission and processing low .

[0051] Step 4: The variable frequency water pump 5 is driven by the inverter and the variable frequency water pump 5 is in the second high frequency range (f P,middle ,f P,max ] operation, the built-in drive module of the inverter selects multiple carrier frequencies and connects them in sequence. After stable operation for the set time t under each carrier frequency, the noise value is detected. After horizontal comparison of the noise values, the built-in drive module of the inverter selects the carrier frequency f with the smallest noise value. high Input transfer and processing continues.

[0052] Preferably but not limitatively, step 4 specifically includes:

[0053] Step 4.1: The variable frequency water pump 5 is in the second high frequency range (f P,middle ,f P,max ] operation, the built-in drive module of the inverter selects the first carrier frequency f AAnd access, stable operation set duration t, detected noise value N A .

[0054] Step 4.2: variable frequency water pump 5 in the second high frequency interval (f P,middle ,f P,max ] operation, frequency converter built-in drive module selected second carrier frequency f B And access, second carrier frequency f B Different from the first carrier frequency f A , and stable operation set duration t, detected noise value N B .

[0055] Step 4.3: compare noise value N A And noise value N B , if the noise value N A Less than noise value N B , frequency converter built-in drive module selected first carrier frequency f A As the carrier frequency f high Continue to execute input transmission and processing; if the noise value N A Equal to noise value N B , frequency converter built-in drive module selected first carrier frequency f A Or the second carrier frequency f B As the carrier frequency f high Continue to execute input transmission and processing; if the noise value N A Greater than noise value N B , frequency converter built-in drive module selected second carrier frequency f B As the carrier frequency f high Continue to execute input transmission and processing.

[0056] It is worth noting that, step 3 and step 4 can be set to multiple carrier frequency transverse comparison noise, and then select the carrier frequency with the minimum noise value, step 3 and step 4 transverse comparison of the number of carrier frequency can be the same, or different. In the above preferred but not limited embodiments, two carrier frequencies are introduced in detail. But it can be understood that, the unit low frequency operation, noise itself is not big, only need to compare the reference number two groups, unit high frequency operation, can follow the comparison of reference number two groups, also can compare the reference number of groups.

[0057] Step 5: during normal operation, variable frequency water chiller start, according to the set mode, external water pump drive module 6 first detects the real-time frequency f C,t And variable frequency water pump 5 frequency f P,t ;

[0058] According to the real-time frequency fC,t the first low frequency interval [f C,min ,f C,middle ] or the first high frequency interval (f C,middle ,f C,max ], the real-time running frequency f P,t of the variable frequency water pump 5 corresponds to the second low frequency interval [f P,min ,f P,middle ] or the second high frequency interval (f P,middle ,f P,max ];

[0059] The running drive of the variable frequency water pump 5 corresponds to the drive board drive or the frequency converter drive, the drive board built-in module executes input transmission and processing at the carrier frequency f low or the frequency converter built-in drive module executes input transmission and processing at the carrier frequency f high .

[0060] As one of the outstanding substantial features of the present application and the significant progress brought to the prior art, the present application discloses the following technical content: in engineering practice, when the variable frequency water pump runs at a high frequency interval, the overall noise of the water pump and the unit driven by the frequency converter is obviously lower than that driven by the drive board; on the contrary, when the variable frequency water pump runs at a low frequency interval, the overall noise of the water pump and the unit driven by the frequency converter is obviously higher than that driven by the drive board.

[0061] Therefore, the present application provides the technical concept that the external drive module device first detects the running frequency of the variable frequency compressor, and selects the control mode of the variable frequency water pump drive according to the feedback compressor running frequency.

[0062] Further, the present application also discloses that when the compressor of the unit runs at a high frequency interval, the running frequency of the variable frequency water pump is also at a high frequency interval. Under the above technical concept of selecting the control mode of the variable frequency water pump drive, the total load is detected and calculated before starting, so that the running frequency of the corresponding compressor and water pump can be obtained, which is used for simulating customer demand and optimizing the carrier frequency of the drive board built-in module and the frequency converter built-in drive module in the low frequency interval and the high frequency interval respectively.

[0063] Therefore, by dividing the running frequency range of the variable frequency compressor 1 and the variable frequency water pump 5 into a low frequency interval and a high frequency interval, the carrier frequency for reducing the overall noise can be more quickly optimized, that is, when the variable frequency compressor 1 runs at the first low frequency interval [f C,min ,f C,middle ], the variable frequency water pump 5 runs at the second low frequency interval [f P,min ,f P,middle ], and only the carrier frequency of the drive board built-in module capable of reducing noise is optimized, without having to optimize the complete running frequency range [fP,min ,f P,max ] Optimize the carrier frequency; the same applies to optimizing the carrier frequency that can reduce noise in the built-in drive module of the inverter.

[0064] Furthermore, the present invention can either optimize the carrier frequency for reducing noise each time the air conditioner is turned on, or optimize in advance based on simulated test customer scenario requirements before the air conditioner leaves the factory, and automatically switch the drive mode and carrier frequency each time the air conditioner is turned on.

[0065] In order to more clearly illustrate the outstanding substantive features of the present invention and the significant advancements it brings to the prior art, an application example of the present invention is described below. Example 3 of the present invention discloses a control method for automatic switching of a variable frequency water pump drive mode, comprising the following steps:

[0066] Step 1: During the commissioning period, before starting the variable frequency chiller, simulate and test customer needs and detect and calculate the total load, thereby obtaining the operating frequencies of the corresponding variable frequency compressor 1 and variable frequency water pump 5.

[0067] Step 2: Divide the operating frequency range of the variable frequency compressor (10-90 Hz) into high and low frequency intervals, wherein the first low frequency interval is 10-50 Hz and the first high frequency interval is 51-90 Hz;

[0068] The operating frequency range of the variable frequency water pump (0-40Hz) is divided into high and low frequency intervals, among which the second low frequency area is 0-20Hz and the second high frequency area is 21-40Hz.

[0069] If the total load requires the variable frequency compressor 1 to operate in the first low frequency range of 10-50 Hz, proceed to step 3;

[0070] If the total load requires the variable frequency compressor 1 to operate in the first high frequency range of 51-90 Hz, proceed to step 4.

[0071] Step 3: When the compressor of the unit is running in the low frequency band, the frequency of the variable frequency water pump is also in the low frequency band. The variable frequency water pump 5 runs in the second low frequency range of 0-20Hz, and the water pump running drive is connected to the drive board drive.

[0072] First, access different carrier frequencies f a 、f b , run stably for 10 minutes respectively;

[0073] Then, the contrast noise value is detected to determine the input carrier frequency f a or f b Specifically, when accessing f a When the noise value of the detection record is N a , when access fb When the noise value of the detection record is N b , if the noise value is N a Less than the noise value N b , at this time according to the carrier frequency f a Input transmission and processing. If the noise value is N a Greater than the noise value N b , at this time according to the carrier frequency f b Input transmission and processing. If the noise value is N a Equal to the noise value N b , at this time both carrier frequencies can be input for transmission and processing.

[0074] Step 4: When the compressor of the unit is running in the high frequency band, the frequency of the variable frequency water pump is also in the high frequency band. The variable frequency water pump 5 runs in the second high frequency range of 21-40Hz, and the water pump operation drive is connected to the inverter drive.

[0075] First, access different carrier frequencies f A 、f B , run stably for 10 minutes respectively;

[0076] Then, the contrast noise value is detected to determine the input carrier frequency f A or f B Specifically, when accessing f A When the noise value of the detection record is N A , when access f B When the noise value of the detection record is N B , if the noise value is N A Less than the noise value N B , at this time according to the carrier frequency f A Input transmission and processing. If the noise value is N A Greater than the noise value N B , at this time according to the carrier frequency f B Input transmission and processing. If the noise value is N A Equal to the noise value N B , at this time both carrier frequencies can be input for transmission and processing.

[0077] Step 5: During normal operation, after the variable frequency chiller 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 the variable frequency compressor 1 C,tThe first low frequency range is 10-50Hz or the first high frequency range is 51-90Hz, and the real-time operating frequency of the variable frequency water pump 5 is f P,t Corresponding to the second low frequency range 0-20Hz or the second high frequency range 21-40Hz;

[0079] The operation drive of the variable frequency water pump 5 is automatically switched to the corresponding drive board drive or inverter drive. The built-in module of the drive board uses the carrier frequency f determined in step 3. a or f b Perform input transmission and processing, or the built-in drive module of the inverter uses the carrier frequency f determined in step 4 A or f B Performs input transmission and processing.

[0080] Embodiment 4 of the present invention provides a chiller, which operates a control method for automatic switching of a variable frequency water pump drive mode as described in embodiment 1, wherein the chiller includes: a variable frequency compressor 1, a condenser 2, an electronic expansion valve 3 and an evaporator 4 which are connected in a closed loop in sequence through pipelines.

[0081] The evaporator 4 is connected to a variable frequency water pump 5, and the variable frequency water pump 5 is electrically connected to an external water pump driving module 6. The external water pump driving 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 automatic switching of the driving 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 operates in the high frequency zone, and the drive board is used to drive the variable frequency water pump 5 when it operates in the low frequency zone.

[0083] Preferably, the driver board has a built-in driver module that sets different carrier input frequencies f A or f B , the built-in drive module of the inverter sets different carrier input frequencies f a or f b .

[0084] The chiller also includes a sound level meter for detecting the noise of the entire chiller; the sound level meter sends the noise value of the entire chiller to the external water pump drive module, so that the external water pump drive module selects the carrier frequency with the lowest noise value based on the noise values ​​at different carrier frequencies.

[0085] Preferably, a vapor-liquid separator 8 is provided on the pipeline between the evaporator and the compressor, and an oil separator 7 is provided on the pipeline between the variable frequency compressor and the condenser.

[0086] Preferably, the bypass pipeline is connected at one end between the variable frequency compressor 1 and the gas-liquid separator 8, and at the other end with the oil separator 7.

[0087] Preferably, the condenser 2 is provided with a variable frequency fan 9 and a humidity sensor 10.

[0088] Embodiment 5 of the present application provides an electronic device comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, which, when loaded into the processor, implements the control method for automatic switching of the variable frequency water pump driving mode according to Embodiments 1, 2 or 3.

[0089] Embodiment 6 of the present application provides a storage medium, which stores a computer program, which, when executed by a processor, implements a control method for automatic switching of the variable frequency water pump driving mode according to Embodiments 1, 2 or 3.

[0090] Compared with the prior art, the present application has at least the following beneficial effects: by controlling the variable frequency water pump of the system, the present application solves the problem of abnormal noise of the variable frequency water pump of the water chiller unit. Thus, the noise of the water chiller unit is reduced, the energy efficiency of the water chiller unit is improved, the problem of excessive noise of the water chiller unit during operation is solved, the stable operation of the water chiller unit is facilitated, and the comfort of the user is ensured.

[0091] The present disclosure can be a system, a method, and / or a computer program product. The computer program product can include a computer readable storage medium (or media) having computer readable program instructions thereon for causing a processor to carry out aspects of the present disclosure.

[0092] The computer readable storage medium can be a tangible device that can retain and store instructions for use by an instruction execution device. The computer readable storage medium can be, for example, but is not limited to, an electronic storage device, a magnetic storage device, an optical storage device, an electromagnetic storage device, a semiconductor storage device, or any suitable combination of the foregoing. More specific examples (a non-exhaustive list) of the computer readable storage medium include the following: a portable computer diskette, a hard disk, a random access memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or Flash memory), a static random access memory (SRAM), a portable compact disc read-only memory (CD-ROM), a digital versatile disk (DVD), a memory stick, a floppy disk, a mechanically encoded device such as punch-cards or punched tape, and any suitable combination of the foregoing. A computer readable storage medium, as used herein, is not to be construed as being transitory signals per se, such as radio waves or other freely propagating electromagnetic waves, electromagnetic waves propagating through a waveguide or other transmission media (e.g., light pulses passing through a fiber-optic cable), or electrical signals transmitted through a wire.

[0093] The computer-readable program instructions described herein can be downloaded from a computer-readable storage medium to each computing / processing device, or downloaded to an external computer or external storage device via a network, such as the Internet, a local area network, a wide area network, and / or a wireless network. The network can include copper transmission cables, fiber optic transmission, wireless transmission, routers, firewalls, switches, gateway computers, and / or edge servers. The network adapter card or network interface in each computing / processing device receives the computer-readable program instructions from the network and forwards the computer-readable program instructions to be stored in the computer-readable storage medium in each computing / processing device.

[0094] The computer program instructions for performing the operations of the present disclosure may be assembly instructions, instruction set architecture (ISA) instructions, machine instructions, machine-dependent instructions, microcode, firmware instructions, state 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++, and conventional procedural programming languages ​​such as "C" language or similar programming languages. Computer-readable program instructions may be executed entirely on a user's computer, partially on a user's computer, as an independent software package, partially on a user's computer, partially on a remote computer, or entirely on a remote computer or server. In the case of 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., utilizing an Internet service provider to connect via the Internet). In some embodiments, an electronic circuit, such as a programmable logic circuit, a field programmable gate array (FPGA), or a programmable logic array (PLA), may be personalized by utilizing the state information of the computer-readable program instructions. The electronic circuit may execute the computer-readable program instructions, thereby realizing various aspects of the present disclosure.

[0095] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the above embodiments, ordinary technicians in the field should understand that the specific implementation methods of the present invention can still be modified or replaced by equivalents. Any modification or equivalent replacement that does not depart from the spirit and scope of the present invention should be covered by the scope of protection of the claims of the present invention.

Claims

1. A control method for automatic switching of drive modes of a variable frequency water pump, characterized in that: The following steps are involved: The operating frequency range of the variable frequency compressor (1) is set at the first set frequency dividing point f C,middle The frequency range of the variable frequency water pump (5) is divided into a first low frequency range and a first high frequency range, and the operating frequency range of the variable frequency water pump (5) is set at the second set frequency demarcation point f P,middle Divided into a second low frequency interval and a second high frequency interval; If it is detected that the variable frequency compressor (1) is running in the first low frequency range and the variable frequency water pump (5) is running in the second low frequency range, the running drive of the variable frequency water pump (5) is switched to the drive board drive and the set carrier frequency f is used. low Continue with input transfer and processing; If it is detected that the variable frequency compressor (1) is running in the first high frequency range and the variable frequency water pump (5) is running in the second high frequency range, the running drive of the variable frequency water pump (5) is switched to the inverter drive and operates at the set carrier frequency f high Input transfer and processing continues.

2. The control method for automatic switching of drive modes of a variable frequency water pump 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 drive. The built-in module of the drive board selects multiple carrier frequencies and connects them in sequence. Under each carrier frequency, the noise value is detected. The noise values ​​are compared horizontally. The built-in module of the drive board selects the carrier frequency f with the smallest noise value. low Input transfer and processing continues.

3. The control method for automatic switching of drive modes of a variable frequency water pump 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 driver board selects the third carrier frequency f a And connected, after stable operation for the set time t, the noise value N is detected a ; The fourth carrier frequency f is selected by the built-in module of the driver board b And access, the fourth carrier frequency f b Different from the third carrier frequency f a After stable operation for the set time t, the noise value N is detected b ; Comparison of noise value N a and noise value N b , if the noise value N a Less than the noise value N b , the built-in module of the driver board selects the third carrier frequency f a The carrier frequency f is used to continue the input transmission and processing low ; If the noise value N a Equal to the noise value N a , the built-in module of the driver board selects the third carrier frequency f a Or the fourth carrier frequency f b The carrier frequency f is used to continue the input transmission and processing low ; If the noise value N a Greater than the noise value N b , the built-in module of the driver board selects the fourth carrier frequency f b The carrier frequency f is used to continue the input transmission and processing low .

4. A control method for automatic switching of drive modes of a variable frequency water pump 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 frequency converter. The variable frequency water pump (5) operates in the second high frequency range. The built-in drive module of the frequency converter selects multiple carrier frequencies and sequentially connects them. Under each carrier frequency, the noise value is detected. The noise values ​​are compared horizontally. The built-in drive module of the frequency converter selects the carrier frequency f with the smallest noise value. high Input transfer and processing continues.

5. The control method for automatic switching of drive modes of a variable frequency water pump according to claim 4, characterized in that: Each time the chiller is turned on, it executes a command to obtain the set carrier frequency f low Or carrier frequency f high The process is carried out with the newly acquired carrier frequency f low Or carrier frequency f high Input transfer and processing continues.

6. The control method for automatic switching of drive modes of a variable frequency water pump according to claim 1, characterized in that: If it is detected that the variable frequency compressor (1) is running in the first low frequency range of 10-50 Hz and the variable frequency water pump (5) is running in the second low frequency range of 0-20 Hz, the running drive of the variable frequency water pump (5) is switched to the drive board drive. If it is detected that the variable frequency compressor (1) operates in the first high frequency range of 51-90 Hz and the second high frequency range of 21-40 Hz, the operation drive of the variable frequency water pump (5) is switched to the inverter drive.

7. A chiller, operating a control method for automatic switching of a variable frequency water pump drive mode according to any one of claims 1 to 6, characterized in that: include: A variable frequency compressor (1), a variable frequency water pump (5), and an external water pump driving module (6) for detecting the operating frequency of the variable frequency compressor (1) and the 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 inverter drive according to the detected real-time operating frequencies of the variable frequency compressor (1) and the variable frequency water pump (5), and continues to perform input transmission and processing at the set carrier frequency.

8. The chiller according to claim 7, characterized in that: The chiller also includes: Sound level meter, used to detect the noise of the water unit; The sound level meter sends the noise value of the entire water unit to the external water pump driving module, so that the external water pump driving module selects the carrier frequency with the lowest noise value according to the noise values ​​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, wherein: When the computer program is loaded into a processor, the control method for automatic switching of the variable frequency water pump driving mode is implemented 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 a processor, a control method for automatic switching of a variable frequency water pump driving mode is implemented according to any one of claims 1 to 6.

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