Cavitation prevention method and system for hot water pump of heat supply system

Abstract

The invention relates to the technical field of heat supply systems, and particularly discloses a heat supply system hot water pump cavitation prevention method and system.The method comprises the steps that current hot water pump cavitation data are obtained, comprehensive calculation is conducted on the current hot water pump cavitation data, and a cavitation comprehensive value is obtained; the change condition of the cavitation comprehensive value is obtained, a phase-space trajectory diagram is established according to the change condition of the cavitation comprehensive value, and cavitation danger early warning parameters are determined according to the phase-space trajectory diagram; the change condition of the cavitation risk early-warning parameters is obtained, and the opening degree of the hot water pump is set according to the change condition of the cavitation risk early-warning parameters; according to the hot water pump opening degree control method, the optimal opening degree of the hot water pump is set according to the cavitation data of the hot water pump, the opening degree of the hot water pump is controlled, the operation reliability of the hot water pump can be improved, and the operation reliability of the hot water pump is improved. And equipment damage caused by hot water pump cavitation is avoided.

Description

Technical Field

[0001] The present application relates to the technical field of heating systems, and more specifically, to a method and system for preventing cavitation of a hot water pump in a heating system. Background Art

[0002] The hot water pump is an important device that timely transports the condensed water (drain) of the steam in the corresponding heater to other thermal systems. The hot water pump of the heating system, such as the condensate pump of the surface heater and the drain pump of the low-pressure heater of the steam turbine unit, is prone to cavitation during operation, resulting in the pump not pumping water, thus affecting the safe operation of the entire system.

[0003] When cavitation occurs in a hot water pump, the conventional method is to shut down the equipment and manually exhaust the gas. This process is labor intensive, the gas is difficult to exhaust, and there is a potential safety hazard that may affect the vacuum of the steam turbine. Summary of the invention

[0004] The present invention provides a method and system for preventing cavitation of a hot water pump in a heating system, which is used to solve the problem that cavitation is easy to occur during the operation of the hot water pump in the prior art, and comprises: Obtain the current hot water pump cavitation data, perform comprehensive calculation on the current hot water pump cavitation data, and obtain a comprehensive cavitation value; Obtain the change of the comprehensive value of cavitation, establish a phase space trajectory diagram according to the change of the comprehensive value of cavitation, and determine the cavitation hazard warning parameters according to the phase space trajectory diagram; Obtain changes in cavitation hazard warning parameters, and set the hot water pump opening according to the changes in the cavitation hazard warning parameters; The hot water pump opening control logic is determined according to the hot water pump opening, and the hot water pump opening is controlled according to the hot water pump opening control logic.

[0005] Furthermore, the comprehensive calculation of the current hot water pump cavitation data to obtain the comprehensive cavitation value includes: Acquire historical hot water pump cavitation event data, pre-process the historical hot water pump cavitation event data, and determine the change of the historical hot water pump cavitation data within a preset period and the corresponding cavitation intensity according to the pre-processed historical hot water pump cavitation event data; Calculate the correlation coefficient between the change of the cavitation data of each hot water pump within the preset period and the cavitation intensity according to the change of the historical hot water pump cavitation data within the preset period and the corresponding cavitation intensity; Obtain the change of the current hot water pump cavitation data within a preset period, and determine the correlation coefficient between the current hot water pump cavitation data and the cavitation intensity according to the change of each hot water pump cavitation data within the preset period and the correlation coefficient of the cavitation intensity; Screening out the hot water pump cavitation data with a correlation coefficient greater than a first preset threshold, and setting a cavitation weight according to the correlation coefficient of each screened hot water pump cavitation data; The screened hot water pump cavitation data are weighted and summed according to the cavitation weight to obtain the comprehensive cavitation value.

[0006] Further, the method of determining the correlation coefficient between the current hot water pump cavitation data and the cavitation intensity according to the change of each hot water pump cavitation data within a preset period and the correlation coefficient between the cavitation intensity includes: Obtain the correlation coefficient between the change of cavitation data of each hot water pump within a preset period and the cavitation intensity, and establish a training sample set according to the correlation coefficient between the change of cavitation data of each hot water pump within a preset period and the cavitation intensity; Establishing a correlation coefficient evaluation model according to the training sample set and training the correlation coefficient evaluation model to obtain a trained correlation coefficient evaluation model; The change of the current hot water pump cavitation data within the preset period is obtained, and the change of the current hot water pump cavitation data within the preset period is input into the trained correlation coefficient evaluation model to obtain the correlation coefficient between the current hot water pump cavitation data and the cavitation intensity.

[0007] Furthermore, the phase space trajectory diagram is established according to the change of the cavitation comprehensive value, and the cavitation hazard warning parameters are determined according to the phase space trajectory diagram, including: Obtain the change of the cavitation comprehensive value, and obtain the cavitation comprehensive value time series according to the change of the cavitation comprehensive value; Obtaining a preset segmentation threshold, segmenting the cavitation comprehensive value time series according to the preset segmentation threshold, and obtaining a plurality of sub-cavitation comprehensive value time series; The phase space of each sub-cavitation comprehensive value time series is reconstructed to obtain a three-dimensional phase space trajectory diagram, and the cavitation hazard warning parameters are determined according to the phase space trajectory diagram.

[0008] Further, the step of determining the cavitation hazard warning parameter according to the phase space trajectory diagram includes: Determine the distance value of each node in the phase space trajectory diagram according to the phase space trajectory diagram, and connect the nodes whose distance value is less than a second preset threshold value by edges; Determine the number of closed triangles formed by all connected nodes in the phase space trajectory diagram according to the nodes after edge connection, and calculate the area values ​​of all closed triangles; The cavitation hazard warning parameters are determined according to the area value and quantity of the closed triangles in the phase space trajectory diagram corresponding to the time series of each sub-cavitation comprehensive value.

[0009] Further, the cavitation hazard warning parameter is determined according to the area value and quantity of the closed triangles of the phase space trajectory diagram corresponding to each sub-cavitation comprehensive value time series, including: The cavitation hazard warning parameter is determined according to the cavitation hazard warning parameter calculation formula, and the cavitation hazard warning parameter calculation formula is specifically:

[0010] in, is the cavitation hazard warning parameter, is the area value of the jth closed triangle of the phase space trajectory diagram corresponding to the sub-cavitation comprehensive value time series, is the number of closed triangles in the phase space trajectory diagram corresponding to the time series of the ith sub-cavitation comprehensive value, To preset standard quantity parameters, is the total number of closed triangles in the phase space trajectory diagram corresponding to the sub-cavitation comprehensive value time series, is the number of phase space trajectory diagrams corresponding to the time series of all sub-cavitation comprehensive values.

[0011] Furthermore, the step of setting the hot water pump opening according to the change of the cavitation risk warning parameter includes: Obtain changes in cavitation hazard warning parameters, and draw a cavitation hazard warning parameter change curve based on the changes in the cavitation hazard warning parameters; Perform curve fitting on the cavitation hazard warning parameter change curve to obtain the cavitation hazard warning parameter prediction curve; Obtaining an allowable danger warning parameter, and determining the time required for the cavitation danger warning parameter to reach the allowable danger warning parameter according to a cavitation danger warning parameter prediction curve; The hot water pump opening is set according to the time required for the cavitation risk warning parameter to reach the allowable risk warning parameter.

[0012] Furthermore, the step of setting the hot water pump opening degree according to the time required for the cavitation risk warning parameter to reach the allowable risk warning parameter includes: Obtain the preset standard time to calculate the difference between the time required for the cavitation danger warning parameter to reach the allowable danger warning parameter and the preset standard time; Determine whether the difference between the required time and the preset standard time is greater than a third preset threshold value, and if the difference between the required time and the preset standard time is greater than the third preset threshold value, set the first opening degree as the hot water pump opening degree; If the difference between the required time and the preset standard time is less than or equal to the third preset threshold, determining whether the difference between the required time and the preset standard time is greater than a fourth preset threshold; If the difference between the required time and the preset standard time is greater than a fourth preset threshold, the second opening degree is set as the hot water pump opening degree; If the difference between the required time and the preset standard time is less than or equal to the fourth preset threshold, the third opening degree is set as the hot water pump opening degree.

[0013] Further, the hot water pump opening control logic is determined according to the hot water pump opening, including: According to the hot water pump opening, preset sections of the opening of each hot water pump are set, and according to the preset sections, control curves of each section of the hot water pump opening are determined; The hot water pump opening control logic is determined according to the control curves of each segment of the hot water pump opening.

[0014] In order to achieve the above object, the present invention also provides a heating system hot water pump anti-cavitation system, comprising: The first module is used to obtain the current cavitation data of the hot water pump, perform comprehensive calculation on the current cavitation data of the hot water pump, and obtain the comprehensive cavitation value; The second module is used to obtain the change of the comprehensive value of cavitation, establish a phase space trajectory diagram according to the change of the comprehensive value of cavitation, and determine the cavitation hazard warning parameters according to the phase space trajectory diagram; The third module is used to obtain the change of the cavitation hazard warning parameter and set the opening of the hot water pump according to the change of the cavitation hazard warning parameter; The fourth module is used to determine the hot water pump opening control logic according to the hot water pump opening, and control the hot water pump opening according to the hot water pump opening control logic.

[0015] The beneficial effects of the present invention are: By applying the above technical scheme, the present invention obtains the current hot water pump cavitation data, performs comprehensive calculation on the current hot water pump cavitation data, and obtains the comprehensive cavitation value; obtains the change of the comprehensive cavitation value, establishes a phase space trajectory diagram according to the change of the comprehensive cavitation value, and determines the cavitation hazard warning parameters according to the phase space trajectory diagram; obtains the change of the cavitation hazard warning parameters, and sets the opening of the hot water pump according to the change of the cavitation hazard warning parameters; determines the opening control logic of the hot water pump according to the opening of the hot water pump, and controls the opening of the hot water pump according to the opening control logic of the hot water pump. The present invention sets the optimal opening of the hot water pump through various cavitation data of the hot water pump, and controls the opening of the hot water pump, which can improve the reliability of the operation of the hot water pump and avoid equipment damage caused by cavitation of the hot water pump. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For those skilled in the art, other drawings can be obtained based on these drawings without creative work.

[0017] Figure 1 The overall flow chart of a method for preventing cavitation of a hot water pump in a heating system proposed by an embodiment of the present invention is shown; Figure 2A schematic structural diagram of a hot water pump anti-cavitation system for a heating system proposed in an embodiment of the present invention is shown. DETAILED DESCRIPTION

[0018] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0019] The present application embodiment provides a method for preventing cavitation of a hot water pump in a heating system, such as Figure 1 As shown, including: S101, obtaining current hot water pump cavitation data, performing comprehensive calculation on the current hot water pump cavitation data, and obtaining a comprehensive cavitation value; In some embodiments of the present application, the comprehensive calculation of the current hot water pump cavitation data to obtain the comprehensive cavitation value includes: obtaining historical hot water pump cavitation event data, preprocessing the historical hot water pump cavitation event data, and determining the change of the historical hot water pump cavitation data within a preset period and the corresponding cavitation intensity according to the preprocessed historical hot water pump cavitation event data; calculating the correlation coefficient between the change of each hot water pump cavitation data within the preset period and the cavitation intensity according to the change of the historical hot water pump cavitation data within the preset period and the corresponding cavitation intensity; obtaining the change of the current hot water pump cavitation data within the preset period, and determining the correlation coefficient between the current hot water pump cavitation data and the cavitation intensity according to the correlation coefficient between the change of each hot water pump cavitation data within the preset period and the cavitation intensity; screening out the hot water pump cavitation data with a correlation coefficient greater than a first preset threshold, and setting the cavitation weight according to the correlation coefficient of each screened hot water pump cavitation data; and weighted summing the screened hot water pump cavitation data according to the cavitation weight to obtain the comprehensive cavitation value.

[0020] In this embodiment, the hot water pump of the heating system includes a condensate pump of a surface heater, a drain pump of a low-pressure heater of a steam turbine unit, etc., which timely transports the condensate (drain) of the steam in the corresponding heater to other important equipment of the thermal system. The historical hot water pump cavitation event data is the data affecting the cavitation intensity, such as the change value of the water level of the hot water pump corresponding to the heater, the change value of the current, the change value of the hot water pump outlet pressure, etc. when the cavitation event occurs. The cavitation intensity can be the amplitude of the hot water pump, the noise, and other data that can measure the severity of cavitation. The hot water pump cavitation data is screened by the correlation coefficient between the current hot water pump cavitation data and the cavitation intensity, so that the correlation coefficient of each screened hot water pump cavitation data is normalized, the normalized correlation coefficient is set as the cavitation weight, and the cavitation comprehensive value is calculated.

[0021] In some embodiments of the present application, the method of determining the correlation coefficient between the current hot water pump cavitation data and the cavitation intensity based on the correlation coefficient between the change of each hot water pump cavitation data within a preset period and the cavitation intensity includes: obtaining the correlation coefficient of the cavitation intensity corresponding to the change of each hot water pump cavitation data within a preset period, and establishing a training sample set according to the correlation coefficient of the cavitation intensity corresponding to the change of each hot water pump cavitation data within the preset period; establishing a correlation coefficient evaluation model according to the training sample set and training the correlation coefficient evaluation model to obtain a trained correlation coefficient evaluation model; obtaining the change of the current hot water pump cavitation data within the preset period, inputting the change of the current hot water pump cavitation data within the preset period into the trained correlation coefficient evaluation model to obtain the correlation coefficient of the current hot water pump cavitation data and the cavitation intensity.

[0022] In this embodiment, the change of each hot water pump cavitation data within a preset period is differentiated according to a preset range of change, and the correlation coefficient evaluation model is trained by establishing a training sample set of the hot water pump cavitation data in each range of change and the corresponding cavitation intensity correlation coefficient, thereby establishing a correlation coefficient evaluation model, and then the corresponding correlation coefficient is evaluated by the change of the hot water pump cavitation data within the preset period based on the correlation coefficient evaluation model.

[0023] S102, obtaining a change in the cavitation comprehensive value, establishing a phase space trajectory diagram according to the change in the cavitation comprehensive value, and determining a cavitation hazard warning parameter according to the phase space trajectory diagram; In some embodiments of the present application, a phase space trajectory diagram is established according to the change of the cavitation comprehensive value, and the cavitation hazard warning parameters are determined according to the phase space trajectory diagram, including: obtaining the change of the cavitation comprehensive value, and obtaining a cavitation comprehensive value time series according to the change of the cavitation comprehensive value; obtaining a preset segmentation threshold, and segmenting the cavitation comprehensive value time series according to the preset segmentation threshold to obtain a plurality of sub-cavitation comprehensive value time series; performing phase space reconstruction on each sub-cavitation comprehensive value time series to obtain a phase space trajectory diagram in three-dimensional space, and determining the cavitation hazard warning parameters according to the phase space trajectory diagram.

[0024] In this embodiment, a phase space trajectory diagram is established by reconstructing the time series of the cavitation comprehensive value in phase space to evaluate the stability of the cavitation comprehensive value, thereby calculating the cavitation hazard warning parameter.

[0025] In some embodiments of the present application, determining the cavitation hazard warning parameters based on the phase space trajectory diagram includes: determining the distance value of each node in the phase space trajectory diagram based on the phase space trajectory diagram, and edge-connecting the nodes whose distance values ​​are less than a second preset threshold; determining the number of closed triangles formed by all connected nodes in the phase space trajectory diagram based on the nodes after edge connection, and calculating the area values ​​of all closed triangles; determining the cavitation hazard warning parameters based on the area value and number of closed triangles in the phase space trajectory diagram corresponding to the time series of each sub-cavitation comprehensive value.

[0026] In some embodiments of the present application, the cavitation hazard warning parameter is determined according to the area value and quantity of the closed triangles of the phase space trajectory diagram corresponding to each sub-cavitation comprehensive value time series, including: determining the cavitation hazard warning parameter according to the cavitation hazard warning parameter calculation formula, and the cavitation hazard warning parameter calculation formula is specifically,

[0027] in, is the cavitation hazard warning parameter, is the area value of the jth closed triangle of the phase space trajectory diagram corresponding to the sub-cavitation comprehensive value time series, is the number of closed triangles in the phase space trajectory diagram corresponding to the time series of the ith sub-cavitation comprehensive value, To preset standard quantity parameters, is the total number of closed triangles in the phase space trajectory diagram corresponding to the sub-cavitation comprehensive value time series, is the number of phase space trajectory diagrams corresponding to the time series of all sub-cavitation comprehensive values.

[0028] In this embodiment, the more closed triangles are formed in the phase space trajectory diagram and the larger the area is, the worse the stability of the corresponding time series is and the higher the cavitation hazard coefficient is. Therefore, the cavitation hazard warning parameters are determined by establishing a cavitation hazard warning parameter calculation formula to accurately calculate the cavitation risk of the hot water pump.

[0029] S103, obtaining changes in cavitation hazard warning parameters, and setting the opening of the hot water pump according to the changes in the cavitation hazard warning parameters; In some embodiments of the present application, the method of setting the opening of the hot water pump according to the change of the cavitation hazard warning parameter includes: obtaining the change of the cavitation hazard warning parameter, and drawing a cavitation hazard warning parameter change curve according to the change of the cavitation hazard warning parameter; performing curve fitting on the cavitation hazard warning parameter change curve to obtain a cavitation hazard warning parameter prediction curve; obtaining an allowable hazard warning parameter, and determining the time required for the cavitation hazard warning parameter to reach the allowable hazard warning parameter according to the cavitation hazard warning parameter prediction curve; and setting the opening of the hot water pump according to the time required for the cavitation hazard warning parameter to reach the allowable hazard warning parameter.

[0030] In this embodiment, the cavitation hazard warning parameter change curve is fitted based on the least squares method to obtain a cavitation hazard warning parameter prediction curve and predict the time required for the cavitation hazard warning parameter to reach the allowable hazard warning parameter and set the hot water pump opening.

[0031] In some embodiments of the present application, the setting of the hot water pump opening according to the time required for the cavitation hazard warning parameter to reach the allowable hazard warning parameter includes: obtaining the preset standard time to calculate the difference between the time required for the cavitation hazard warning parameter to reach the allowable hazard warning parameter and the preset standard time; judging whether the difference between the required time and the preset standard time is greater than a third preset threshold value, if the difference between the required time and the preset standard time is greater than the third preset threshold value, setting the first opening degree as the hot water pump opening degree; if the difference between the required time and the preset standard time is less than or equal to the third preset threshold value, judging whether the difference between the required time and the preset standard time is greater than a fourth preset threshold value; if the difference between the required time and the preset standard time is greater than the fourth preset threshold value, setting the second opening degree as the hot water pump opening degree; if the difference between the required time and the preset standard time is less than or equal to the fourth preset threshold value, setting the third opening degree as the hot water pump opening degree.

[0032] In this embodiment, the opening of the hot water pump is set based on the difference between the time required for the cavitation hazard warning parameter to reach the allowable hazard warning parameter and the preset standard time. The smaller the difference, the larger the corresponding opening of the hot water pump. The opening of the hot water pump is dynamically regulated by the difference between the time required for the cavitation hazard warning parameter to reach the allowable hazard warning parameter and the preset standard time, so that the hot water pump is always at the optimal opening, thereby reducing the risk of cavitation.

[0033] S104, determining a hot water pump opening control logic according to the hot water pump opening, and controlling the hot water pump opening according to the hot water pump opening control logic.

[0034] In some embodiments of the present application, determining the hot water pump opening control logic based on the hot water pump opening includes: setting preset segments of each hot water pump opening based on the hot water pump opening, and determining the control curve of each hot water pump opening segment based on the preset segments; determining the hot water pump opening control logic based on the control curve of each hot water pump opening segment.

[0035] In this embodiment, the preset segments of the opening of each hot water pump are set according to the opening of the hot water pump. The larger the opening, the more corresponding preset segments. The maximum number of segments in this embodiment is three, and each segment is preset with a different opening control curve. The opening of the hot water pump is controlled by the opening control curve to minimize damage to the hot water pump.

[0036] Based on the same technical concept, such as Figure 2 As shown, the present invention also provides a heating system hot water pump anti-cavitation system, comprising: The first module is used to obtain the current hot water pump cavitation data, perform comprehensive calculation on the current hot water pump cavitation data, and obtain the comprehensive cavitation value; the second module is used to obtain the change of the comprehensive cavitation value, establish a phase space trajectory diagram according to the change of the comprehensive cavitation value, and determine the cavitation hazard warning parameters according to the phase space trajectory diagram; the third module is used to obtain the change of the cavitation hazard warning parameters, and set the opening of the hot water pump according to the change of the cavitation hazard warning parameters; the fourth module is used to determine the opening control logic of the hot water pump according to the opening of the hot water pump, and control the opening of the hot water pump according to the opening control logic of the hot water pump.

[0037] By applying the above technical scheme, the present invention obtains the current hot water pump cavitation data, performs comprehensive calculation on the current hot water pump cavitation data, and obtains the comprehensive cavitation value; obtains the change of the comprehensive cavitation value, establishes a phase space trajectory diagram according to the change of the comprehensive cavitation value, and determines the cavitation hazard warning parameters according to the phase space trajectory diagram; obtains the change of the cavitation hazard warning parameters, and sets the opening of the hot water pump according to the change of the cavitation hazard warning parameters; determines the opening control logic of the hot water pump according to the opening of the hot water pump, and controls the opening of the hot water pump according to the opening control logic of the hot water pump. The present invention sets the optimal opening of the hot water pump through various cavitation data of the hot water pump, and controls the opening of the hot water pump, which can improve the reliability of the operation of the hot water pump and avoid equipment damage caused by cavitation of the hot water pump.

[0038] Through the description of the above implementation methods, those skilled in the art can clearly understand that the present invention can be implemented by hardware, or by software plus a necessary general hardware platform. Based on such an understanding, the technical solution of the present invention can be embodied in the form of a software product, which can be stored in a non-volatile storage medium (which can be a CD-ROM, a USB flash drive, a mobile hard disk, etc.), including a number of instructions for a computer device (which can be a personal computer, a server, or a network device, etc.) to execute the methods described in each implementation scenario of the present invention.

[0039] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit it. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present application.

Claims

1. A method for preventing cavitation of a hot water pump in a heating system, characterized in that: The method comprises: Obtain the current hot water pump cavitation data, perform comprehensive calculation on the current hot water pump cavitation data, and obtain a comprehensive cavitation value; Obtain the change of the comprehensive value of cavitation, establish a phase space trajectory diagram according to the change of the comprehensive value of cavitation, and determine the cavitation hazard warning parameters according to the phase space trajectory diagram; Obtain changes in cavitation hazard warning parameters, and set the hot water pump opening according to the changes in the cavitation hazard warning parameters; The hot water pump opening control logic is determined according to the hot water pump opening, and the hot water pump opening is controlled according to the hot water pump opening control logic.

2. The method for preventing cavitation of a hot water pump in a heating system according to claim 1, characterized in that: The comprehensive calculation of the current hot water pump cavitation data to obtain the comprehensive cavitation value includes: Acquire historical hot water pump cavitation event data, pre-process the historical hot water pump cavitation event data, and determine the change of the historical hot water pump cavitation data within a preset period and the corresponding cavitation intensity according to the pre-processed historical hot water pump cavitation event data; Calculate the correlation coefficient between the change of the cavitation data of each hot water pump within the preset period and the cavitation intensity according to the change of the historical hot water pump cavitation data within the preset period and the corresponding cavitation intensity; Obtain the change of the current hot water pump cavitation data within a preset period, and determine the correlation coefficient between the current hot water pump cavitation data and the cavitation intensity according to the change of each hot water pump cavitation data within the preset period and the correlation coefficient of the cavitation intensity; Screening out the hot water pump cavitation data with a correlation coefficient greater than a first preset threshold, and setting a cavitation weight according to the correlation coefficient of each screened hot water pump cavitation data; The screened hot water pump cavitation data are weighted and summed according to the cavitation weight to obtain the comprehensive cavitation value.

3. The method for preventing cavitation of a hot water pump in a heating system according to claim 2, characterized in that: Determining the correlation coefficient between the current hot water pump cavitation data and the cavitation intensity according to the change of each hot water pump cavitation data within a preset period and the correlation coefficient of the cavitation intensity includes: Obtain the correlation coefficient between the change of cavitation data of each hot water pump within a preset period and the cavitation intensity, and establish a training sample set according to the correlation coefficient between the change of cavitation data of each hot water pump within a preset period and the cavitation intensity; Establishing a correlation coefficient evaluation model according to the training sample set and training the correlation coefficient evaluation model to obtain a trained correlation coefficient evaluation model; The change of the current hot water pump cavitation data within the preset period is obtained, and the change of the current hot water pump cavitation data within the preset period is input into the trained correlation coefficient evaluation model to obtain the correlation coefficient between the current hot water pump cavitation data and the cavitation intensity.

4. The method for preventing cavitation of a hot water pump in a heating system according to claim 1, characterized in that: The method of establishing a phase space trajectory diagram according to the change of the cavitation comprehensive value and determining the cavitation hazard warning parameter according to the phase space trajectory diagram includes: Obtain the change of the cavitation comprehensive value, and obtain the cavitation comprehensive value time series according to the change of the cavitation comprehensive value; Obtaining a preset segmentation threshold, segmenting the cavitation comprehensive value time series according to the preset segmentation threshold, and obtaining a plurality of sub-cavitation comprehensive value time series; The phase space of each sub-cavitation comprehensive value time series is reconstructed to obtain a three-dimensional phase space trajectory diagram, and the cavitation hazard warning parameters are determined according to the phase space trajectory diagram.

5. The method for preventing cavitation of a hot water pump in a heating system according to claim 4, characterized in that: Determining the cavitation hazard warning parameter according to the phase space trajectory diagram includes: Determine the distance value of each node in the phase space trajectory diagram according to the phase space trajectory diagram, and connect the nodes whose distance value is less than a second preset threshold value by edges; Determine the number of closed triangles formed by all connected nodes in the phase space trajectory diagram according to the nodes after edge connection, and calculate the area values ​​of all closed triangles; The cavitation hazard warning parameters are determined according to the area value and quantity of the closed triangles in the phase space trajectory diagram corresponding to the time series of each sub-cavitation comprehensive value.

6. The method for preventing cavitation of a hot water pump in a heating system according to claim 5, characterized in that: The method of determining the cavitation hazard warning parameter according to the area value and quantity of the closed triangles of the phase space trajectory diagram corresponding to each sub-cavitation comprehensive value time series includes: The cavitation hazard warning parameter is determined according to the cavitation hazard warning parameter calculation formula, and the cavitation hazard warning parameter calculation formula is specifically: in, is the cavitation hazard warning parameter, is the area value of the jth closed triangle of the phase space trajectory diagram corresponding to the sub-cavitation comprehensive value time series, is the number of closed triangles in the phase space trajectory diagram corresponding to the time series of the ith sub-cavitation comprehensive value, To preset standard quantity parameters, is the total number of closed triangles in the phase space trajectory diagram corresponding to the sub-cavitation comprehensive value time series, is the number of phase space trajectory diagrams corresponding to the time series of all sub-cavitation comprehensive values.

7. The method for preventing cavitation of a hot water pump in a heating system according to claim 6, characterized in that: The step of setting the hot water pump opening according to the change of the cavitation risk warning parameter comprises: Obtain changes in cavitation hazard warning parameters, and draw a cavitation hazard warning parameter change curve according to the changes in the cavitation hazard warning parameters; Perform curve fitting on the cavitation hazard warning parameter change curve to obtain the cavitation hazard warning parameter prediction curve; Obtaining an allowable danger warning parameter, and determining the time required for the cavitation danger warning parameter to reach the allowable danger warning parameter according to a cavitation danger warning parameter prediction curve; The hot water pump opening is set according to the time required for the cavitation risk warning parameter to reach the allowable risk warning parameter.

8. The method for preventing cavitation of a hot water pump in a heating system according to claim 7, characterized in that: The step of setting the hot water pump opening degree according to the time required for the cavitation risk warning parameter to reach the allowable risk warning parameter comprises: Obtain the preset standard time to calculate the difference between the time required for the cavitation danger warning parameter to reach the allowable danger warning parameter and the preset standard time; Determine whether the difference between the required time and the preset standard time is greater than a third preset threshold value, and if the difference between the required time and the preset standard time is greater than the third preset threshold value, set the first opening degree as the hot water pump opening degree; If the difference between the required time and the preset standard time is less than or equal to the third preset threshold, determining whether the difference between the required time and the preset standard time is greater than a fourth preset threshold; If the difference between the required time and the preset standard time is greater than a fourth preset threshold, the second opening degree is set as the hot water pump opening degree; If the difference between the required time and the preset standard time is less than or equal to the fourth preset threshold, the third opening degree is set as the hot water pump opening degree.

9. The method for preventing cavitation of a hot water pump in a heating system according to claim 8, characterized in that: The method of determining the hot water pump opening control logic according to the hot water pump opening comprises: According to the hot water pump opening, preset sections of the opening of each hot water pump are set, and according to the preset sections, control curves of each section of the hot water pump opening are determined; The hot water pump opening control logic is determined according to the control curves of each segment of the hot water pump opening.

10. A heating system hot water pump anti-cavitation system, characterized in that: include: The first module is used to obtain the current cavitation data of the hot water pump, perform comprehensive calculation on the current cavitation data of the hot water pump, and obtain the comprehensive cavitation value; The second module is used to obtain the change of the comprehensive value of cavitation, establish a phase space trajectory diagram according to the change of the comprehensive value of cavitation, and determine the cavitation hazard warning parameters according to the phase space trajectory diagram; The third module is used to obtain the change of the cavitation hazard warning parameter and set the opening of the hot water pump according to the change of the cavitation hazard warning parameter; The fourth module is used to determine the hot water pump opening control logic according to the hot water pump opening, and control the hot water pump opening according to the hot water pump opening control logic.

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