A detection method and system for blockage protection of a variable frequency water pump

Abstract

A kind of detection method and system of frequency conversion water pump jam protection, comprising the following steps: confirming the operation mode of frequency conversion water pump, wherein the operation mode includes constant speed mode and constant flow mode;Corresponding detection parameters are obtained based on the operation mode, whether jam appears is judged based on the data result of detection parameters, wherein the detection parameters include current data.The present application judges whether jam by the detection parameters in frequency conversion water pump, without using additional detection equipment.Greatly improve the accuracy and efficiency of jam detection.

Description

Technical Field

[0001] This invention relates to the field of water pump testing technology, and in particular to a testing method and system for the protection against jamming in variable frequency water pumps. Background Technology

[0002] Pool pumps are a crucial component of pool water treatment systems. Their primary function is to circulate and filter pool water, passing it through filters to purify and maintain its clarity. However, over time, dirt and impurities such as leaves, hair, and sand accumulate on the pump impeller. When these substances accumulate to a certain amount, they can clog the impeller, causing the pump to seize up.

[0003] When a water pump becomes clogged, its performance parameters, such as flow rate and head, decrease, making it unable to meet the needs of pool water circulation and filtration. Furthermore, severe clogs significantly reduce the amount of water entering the pump, essentially causing it to run dry. If this is not detected in time, it can damage the pump. In severe cases, it can lead to electrical malfunctions, fires, and other safety hazards, threatening people and property.

[0004] Typically, a flow sensor needs to be installed at the outlet of the water pump to detect whether the flow rate meets a threshold and determine if there is a blockage. However, this method requires purchasing additional sensor equipment, increasing the cost of detection. Moreover, it is limited by the installation experience of workers, and when the installation location is not suitable, it is difficult to accurately obtain the flow rate, thus failing to effectively and accurately determine whether a blockage has occurred. Summary of the Invention

[0005] To address the aforementioned shortcomings, the present invention aims to propose a detection method and system for variable frequency water pump blockage protection, which can detect channel blockage without relying on external data.

[0006] To achieve this objective, the present invention adopts the following technical solution: a detection method for variable frequency water pump jamming protection, comprising the following steps:

[0007] Confirm the operating mode of the variable frequency water pump, wherein the operating mode includes constant speed mode and constant flow mode;

[0008] Based on the operating mode, the corresponding detection parameters are obtained, and the data results of the detection parameters are used to determine whether a blockage has occurred. The detection parameters include current data.

[0009] Preferably, when the water pump operates in constant speed mode, the specific steps for determining whether a blockage has occurred based on the data results of the detection parameters are as follows:

[0010] Obtain the current of the water pump motor as the first current;

[0011] Determine whether the magnitude of the first current is less than the first current threshold.

[0012] If it is less than, then obtain the time when the first current is less than the first current threshold. If the time length when the first current is less than the first current threshold meets the time threshold length, then it is determined that a blockage has occurred.

[0013] Preferably, the first current threshold is determined as follows:

[0014] Obtain the constant speed data set by the user, and determine the corresponding first current threshold based on the speed range in which the constant speed data falls.

[0015] Preferably, when the water pump operates in constant flow mode, the specific steps for determining whether a blockage has occurred based on the data results of the detection parameters are as follows:

[0016] The current of the water pump motor is obtained based on resistance sampling;

[0017] The two-phase currents Id and Iq obtained after performing CLARK and PARK transformations on the current;

[0018] The current speed of the water pump motor is obtained by using the two-phase currents Id and Iq;

[0019] Determine whether the rotational speed is greater than a first rotational speed threshold. If it is, obtain the time during which the rotational speed is greater than the first rotational speed threshold. If the duration of the time during which the rotational speed is greater than the first rotational speed threshold meets the time threshold length, then it is determined that a blockage has occurred.

[0020] Preferably, the first speed threshold is determined as follows:

[0021] Based on the user-defined constant power, obtain the idling speed of the water pump motor under constant power;

[0022] The first speed threshold is obtained by subtracting the idle speed from the speed adjustment threshold.

[0023] A detection system for variable frequency water pump jamming protection, using the aforementioned detection method for variable frequency water pump jamming protection, includes a mode acquisition module and a confirmation module;

[0024] The mode acquisition module is used to confirm the operating mode of the variable frequency water pump.

[0025] The confirmation module is used to obtain the corresponding detection parameters based on the operating mode, and to determine whether a blockage has occurred based on the data results of the detection parameters.

[0026] Preferably, the confirmation module includes a first sub-module;

[0027] The first submodule is used to obtain the current of the water pump motor as the first current;

[0028] Determine whether the magnitude of the first current is less than the first current threshold.

[0029] If it is less than, then obtain the time when the first current is less than the first current threshold. If the time length when the first current is less than the first current threshold meets the time threshold length, then it is determined that a blockage has occurred.

[0030] Preferably, the first submodule includes a first subunit;

[0031] The first subunit is used to acquire the constant speed data set by the user, and determine the corresponding first current threshold based on the speed range into which the constant speed data falls.

[0032] Preferably, the confirmation module includes a second sub-module;

[0033] The second submodule is used to obtain the current of the water pump motor based on resistance sampling;

[0034] The two-phase currents Id and Iq obtained after performing CLARK and PARK transformations on the current;

[0035] The current speed of the water pump motor is obtained by using the two-phase currents Id and Iq;

[0036] Determine whether the rotational speed is greater than a first rotational speed threshold. If it is, obtain the time during which the rotational speed is greater than the first rotational speed threshold. If the duration of the time during which the rotational speed is greater than the first rotational speed threshold meets the time threshold length, then it is determined that a blockage has occurred.

[0037] Preferably, the second submodule includes a second subunit;

[0038] The second subunit is used to obtain the maximum idling speed of the water pump motor under constant power based on the constant power set by the user;

[0039] The first speed threshold is obtained by subtracting the maximum idling speed from the speed adjustment threshold.

[0040] One of the above technical solutions has the following advantages or beneficial effects: This invention determines whether a blockage has occurred by using internal detection parameters of the variable frequency water pump, eliminating the need for additional detection equipment. This greatly improves the accuracy and efficiency of blockage detection. Attached Figure Description

[0041] Figure 1 This is a flowchart of one embodiment of the system of the present invention.

[0042] Figure 2 This is a schematic diagram of a structural embodiment of the present invention. Detailed Implementation

[0043] Embodiments of the present invention are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and should not be construed as limiting the present invention.

[0044] In the description of embodiments of the present invention, 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 indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the stated features. In the description of embodiments of the present invention, "a plurality of" means two or more, unless otherwise explicitly specified.

[0045] 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 indicated technical features. 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, unless otherwise stated, "a plurality of" means two or more. Those skilled in the art will understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0046] like Figures 1-2 As shown, a detection method for variable frequency water pump jamming protection includes the following steps:

[0047] Confirm the operating mode of the variable frequency water pump, wherein the operating mode includes constant speed mode and constant flow mode;

[0048] Based on the operating mode, the corresponding detection parameters are obtained, and the data results of the detection parameters are used to determine whether a blockage has occurred. The detection parameters include current data.

[0049] In this invention, the operating mode of the variable frequency water pump is first determined. Because the system performs corresponding control based on different operating modes, the detection parameters for determining whether a blockage exists differ due to the different control methods. Therefore, the operating mode of the variable frequency water pump needs to be determined before testing. After determining the operating mode, its detection parameters need to be obtained. These detection parameters are the current data of the variable frequency water pump motor. The condition of the motor can be determined through these detection parameters. By combining the motor's operating condition with the operating mode, it can be determined whether a blockage exists.

[0050] This invention determines whether a blockage has occurred by detecting parameters inside the variable frequency water pump, eliminating the need for additional detection equipment. This significantly improves the accuracy and efficiency of blockage detection.

[0051] Preferably, when the water pump operates in constant speed mode, the specific steps for determining whether a blockage has occurred based on the data results of the detection parameters are as follows:

[0052] Obtain the current of the water pump motor as the first current;

[0053] Determine whether the magnitude of the first current is less than the first current threshold.

[0054] If it is less than, then obtain the time when the first current is less than the first current threshold. If the time length when the first current is less than the first current threshold meets the time threshold length, then it is determined that a blockage has occurred.

[0055] When the water pump operates in constant speed mode, the pump motor will run with a fixed rotation speed. Therefore, the rotation speed of the pump motor will remain unchanged regardless of whether a blockage occurs.

[0056] When blockage occurs, the amount of water entering the pump decreases significantly or even ceases, effectively reducing the load on the motor. To maintain a stable speed, the pump motor's power is reduced. Therefore, when blockage occurs, the current drops sharply, allowing the speed to remain constant. Thus, by detecting whether the initial current is below a certain value (the first current threshold), a blockage can be determined.

[0057] Of course, in actual operation, electromagnetic influences may cause instantaneous fluctuations in the current value. This could result in the initial current falling below a first current threshold, but it will subsequently return to its original value. Therefore, this invention also includes a time threshold limitation. Only when the duration of the initial current being less than the first current threshold meets the time threshold is a blockage considered to have occurred. In this case, personnel need to be notified for handling.

[0058] Preferably, the first current threshold is determined as follows:

[0059] Obtain the constant speed data set by the user, and determine the corresponding first current threshold based on the speed range in which the constant speed data falls.

[0060] Since different power (different input current) is required to maintain different rotational speeds, the corresponding first current threshold is also different for different constant rotational speeds.

[0061] As shown in the image below:

[0062]

[0063] By acquiring the constant speed data set by the user, the speed range in which it falls can be determined, and then the corresponding first current threshold can be determined. For example, if the current user sets the constant speed to 3300, it falls within the range of 3251 to 3300, so the first current threshold at this time is 1.66A.

[0064] Preferably, when the water pump operates in constant flow mode, the specific steps for determining whether a blockage has occurred based on the data results of the detection parameters are as follows:

[0065] The current of the water pump motor is obtained based on resistance sampling;

[0066] The two-phase currents Id and Iq obtained after performing CLARK and PARK transformations on the current;

[0067] The current speed of the water pump motor is obtained by using the two-phase currents Id and Iq;

[0068] Determine whether the rotational speed is greater than a first rotational speed threshold. If it is, obtain the time during which the rotational speed is greater than the first rotational speed threshold. If the duration of the time during which the rotational speed is greater than the first rotational speed threshold meets the time threshold length, then it is determined that a blockage has occurred.

[0069] Because the power of a water pump is directly proportional to its flow rate under the same outlet pressure, the power input to the pump motor is constant when the pump is in constant flow mode. Therefore, it is impossible to directly determine whether a blockage has occurred by observing changes in the current. To address this, in this invention, when the pump operates in constant flow mode, the pump motor current is obtained through resistance sampling; the current is then subjected to Clark and Park transformations to obtain two-phase currents Id and Iq; these two-phase currents Id and Iq are input into an observer, which is used to estimate the real-time speed of the pump motor.

[0070] It is worth mentioning that the water pump motor of the present invention is a permanent magnet synchronous motor, and the control method used is based on sensorless FOC vector control.

[0071] Specifically, the observer is a data model constructed based on the relationship between parameters such as speed, torque, and current. Compared to directly using the input current value to obtain the speed, the speed of the permanent magnet synchronous motor can be clearly fed back through the two-phase currents Id and Iq.

[0072] When a blockage occurs, due to the reduced load, the rotational speed increases with the decrease in load at a fixed power. Therefore, by comparing the estimated rotational speed with a first rotational speed threshold, it can be determined whether a blockage has occurred. Of course, in actual operation, electromagnetic influences may cause instantaneous fluctuations in the two-phase currents Id and Iq, resulting in an increase in rotational speed. Therefore, a blockage is only considered to have occurred if the rotational speed exceeds the first rotational speed threshold for a duration that meets the threshold length.

[0073] Preferably, the first speed threshold is determined as follows:

[0074] Based on the user-defined constant power, obtain the idling speed of the water pump motor under constant power;

[0075] The first speed threshold is obtained by subtracting the idle speed from the speed adjustment threshold.

[0076] Because the flow rate decreases significantly when a blockage occurs, or even no water enters the pump, the first speed threshold will be very close to the idle speed. To improve fault tolerance, the speed adjustment threshold of the corresponding gear is subtracted from the idle speed to obtain the first speed threshold.

[0077] Different constant power values ​​correspond to different first speed thresholds. This setting can detect blockage conditions without causing alarms to be issued under normal operating conditions for different cross-flow modes.

[0078] A detection system for variable frequency water pump jamming protection, using the aforementioned detection method for variable frequency water pump jamming protection, includes a mode acquisition module and a confirmation module;

[0079] The mode acquisition module is used to confirm the operating mode of the variable frequency water pump.

[0080] The confirmation module is used to obtain the corresponding detection parameters based on the operating mode, and to determine whether a blockage has occurred based on the data results of the detection parameters.

[0081] Preferably, the confirmation module includes a first sub-module;

[0082] The first submodule is used to obtain the current of the water pump motor as the first current;

[0083] Determine whether the magnitude of the first current is less than the first current threshold.

[0084] If it is less than, then obtain the time when the first current is less than the first current threshold. If the time length when the first current is less than the first current threshold meets the time threshold length, then it is determined that a blockage has occurred.

[0085] Preferably, the first submodule includes a first subunit;

[0086] The first subunit is used to acquire the constant speed data set by the user, and determine the corresponding first current threshold based on the speed range into which the constant speed data falls.

[0087] Preferably, the confirmation module includes a second sub-module;

[0088] The second submodule is used to obtain the current of the water pump motor based on resistance sampling;

[0089] The two-phase currents Id and Iq obtained after performing CLARK and PARK transformations on the current;

[0090] The current speed of the water pump motor is obtained by using the two-phase currents Id and Iq;

[0091] Determine whether the rotational speed is greater than a first rotational speed threshold. If it is, obtain the time during which the rotational speed is greater than the first rotational speed threshold. If the duration of the time during which the rotational speed is greater than the first rotational speed threshold meets the time threshold length, then it is determined that a blockage has occurred.

[0092] Preferably, the second submodule includes a second subunit;

[0093] The second subunit is used to obtain the maximum idling speed of the water pump motor under constant power based on the constant power set by the user;

[0094] The first speed threshold is obtained by subtracting the maximum idling speed from the speed adjustment threshold.

[0095] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0096] Although embodiments of the invention have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the claims and their equivalents.

Claims

1. A detection method for the jamming protection of a variable frequency water pump, characterized in that, Includes the following steps: Confirm the operating mode of the variable frequency water pump, wherein the operating mode includes constant speed mode and constant flow mode; Based on the operating mode, the corresponding detection parameters are obtained, and based on the data results of the detection parameters, it is determined whether a blockage occurs. The detection parameters include current data. When the water pump is operating in constant speed mode, the specific steps to determine whether there is a blockage based on the data results of the detection parameters are as follows: Obtain the current of the water pump motor as the first current; Determine whether the magnitude of the first current is less than the first current threshold. If it is less than, then obtain the time when the first current is less than the first current threshold. If the time length when the first current is less than the first current threshold meets the time threshold length, then it is determined that a blockage has occurred. The first current threshold is determined as follows: Obtain the constant speed data set by the user, and determine the corresponding first current threshold based on the speed range in which the constant speed data falls; When the water pump is operating in constant flow mode, the specific steps to determine whether there is a blockage based on the data results of the detection parameters are as follows: The current of the water pump motor is obtained based on resistance sampling; The two-phase currents Id and Iq obtained after performing CLARK and PARK transformations on the current; The current speed of the water pump motor is obtained by using the two-phase currents Id and Iq; Determine whether the rotational speed is greater than a first rotational speed threshold. If it is, obtain the time during which the rotational speed is greater than the first rotational speed threshold. If the duration of the time during which the rotational speed is greater than the first rotational speed threshold meets the time threshold length, then it is determined that a blockage has occurred. The first speed threshold is determined as follows: Based on the user-defined constant power, obtain the idling speed of the water pump motor under constant power; The first speed threshold is obtained by subtracting the idle speed from the speed adjustment threshold.

2. A detection system for variable frequency water pump jamming protection, using the detection method for variable frequency water pump jamming protection as described in claim 1, characterized in that, This includes a pattern acquisition module and a confirmation module; The mode acquisition module is used to confirm the operating mode of the variable frequency water pump. The confirmation module is used to obtain the corresponding detection parameters based on the operating mode, and to determine whether a blockage occurs based on the data results of the detection parameters. The confirmation module includes a first sub-module; The first submodule is used to obtain the current of the water pump motor as the first current; Determine whether the magnitude of the first current is less than the first current threshold. If it is less than, then obtain the time when the first current is less than the first current threshold. If the time length when the first current is less than the first current threshold meets the time threshold length, then it is determined that a blockage has occurred. The first submodule includes a first subunit; The first subunit is used to acquire the constant speed data set by the user, and determine the corresponding first current threshold based on the speed range into which the constant speed data falls; The confirmation module includes a second sub-module; The second submodule is used to obtain the current of the water pump motor based on resistance sampling; The two-phase currents Id and Iq obtained after performing CLARK and PARK transformations on the current; The current speed of the water pump motor is obtained by using the two-phase currents Id and Iq; Determine whether the rotational speed is greater than a first rotational speed threshold. If it is, obtain the time during which the rotational speed is greater than the first rotational speed threshold. If the duration of the time during which the rotational speed is greater than the first rotational speed threshold meets the time threshold length, then it is determined that a blockage has occurred. The second submodule includes a second subunit; The second subunit is used to obtain the maximum idling speed of the water pump motor under constant power based on the constant power set by the user; The first speed threshold is obtained by subtracting the maximum idling speed from the speed adjustment threshold.

Images