Water pump shaft breakage protection control system

Abstract

The invention discloses a water pump shaft breakage protection control system. The system comprises a water pump shaft; the motor is connected with the water pump shaft and used for driving the water pump shaft to rotate; the sensor unit is arranged on the water pump and used for detecting parameter data of a water pump shaft; the protection device is arranged on the water pump shaft and used for cutting off power connection between the motor and the water pump shaft after the water pump shaft is broken; and the control unit is used for judging the state of the water pump shaft according to the detected parameter data and controlling the working conditions of the motor and the protection device according to the state of the water pump shaft. The abnormal state of the water pump shaft is found in advance by detecting and judging the parameters of the water pump shaft, so that the rotating speed of the motor is slowed down, serious abnormal phenomena of the water pump shaft are reduced, the effect of protection in advance is achieved, power connection between the motor and the water pump shaft can be detected and cut off in time at the moment when the water pump shaft is broken, and the service life of the water pump shaft is prolonged. And further damage caused by continuous operation of the water pump after shaft breakage is avoided, and the risk of accidents is relieved.

Description

Technical Field

[0001] The invention relates to the technical field of water pump broken shaft protection, in particular to a water pump broken shaft protection control system. Background Art

[0002] Water pumps are a common industrial equipment used to transport liquids or compressed gases. During the operation of water pumps, various reasons such as bearing wear, overload, liquid impact, etc. may cause the water pump shaft to break. Once the shaft breaks, if timely measures are not taken, it may cause serious equipment damage or even cause an accident.

[0003] However, the traditional water pump broken shaft protection device does not set appropriate parameter thresholds for different parameter types to judge the status of the water pump shaft. It is unable to detect abnormal phenomena in the water pump shaft in time, and thus is unable to slow down the speed of the motor in advance to reduce the phenomenon of water pump broken shaft, causing unnecessary interruptions to the production process or increasing the risk of equipment damage. In addition, the traditional water pump broken shaft protection device may misjudge that the water pump has broken shaft in some cases, resulting in false alarm shutdown, inaccurate detection, and missed or false alarms. Summary of the invention

[0004] In order to solve the above technical problems, the present invention provides a water pump broken shaft protection control system, comprising:

[0005] Water pump shaft;

[0006] A motor connected to the water pump shaft, the motor being used to drive the water pump shaft to rotate;

[0007] A sensor unit, arranged on the water pump, and used for detecting various parameter data of the water pump shaft;

[0008] A protection device, arranged on the water pump shaft, and used for cutting off the power connection between the motor and the water pump shaft after the water pump shaft breaks;

[0009] The control unit is used to determine the state of the water pump shaft according to the detected parameter data, and control the working conditions of the motor and the protection device according to the state of the water pump shaft.

[0010] Furthermore, the sensor unit comprises:

[0011] A vibration sensor, used for detecting vibration data of the water pump shaft in real time;

[0012] A temperature sensor, used for detecting the temperature data of the water pump shaft in real time;

[0013] A displacement sensor, used for detecting the displacement data of the water pump shaft in real time;

[0014] The vibration sensor, temperature sensor and displacement sensor are electrically connected to the control unit respectively.

[0015] Furthermore, the control unit comprises:

[0016] An acquisition module, used for acquiring vibration data, temperature data and displacement data of the water pump shaft;

[0017] A processing module connected to the acquisition module, the processing module is used to set working instructions of the motor and the protection device according to the detected parameter data;

[0018] A control module is connected to the processing module, and is used to control the motor and the protection device to work according to a working instruction.

[0019] Further, the processing module is used to obtain the vibration data, temperature data and displacement data of the water pump shaft, and to assign corresponding evaluation scores to the vibration data, temperature data and displacement data according to the numerical values ​​corresponding to the data, so as to obtain the vibration evaluation score, temperature evaluation score and displacement evaluation score;

[0020] The processing module is also used to set the vibration preset value, temperature preset value and displacement preset value of the water pump shaft, and to subtract the vibration data, temperature data and displacement data of the water pump shaft from the corresponding vibration preset value, temperature preset value and displacement preset value to obtain the corresponding vibration difference value, temperature difference value and displacement difference value;

[0021] The processing module is also used to determine corresponding weight coefficients according to the numerical values ​​of the vibration difference, temperature difference and displacement difference, and obtain a vibration coefficient, a temperature coefficient and a displacement coefficient;

[0022] The processing module is also used to determine the state evaluation value of the water pump shaft according to the vibration evaluation score, temperature evaluation score and displacement evaluation score and the corresponding vibration coefficient, temperature coefficient and displacement coefficient.

[0023] Furthermore, the calculation formula of the state evaluation value of the water pump shaft is:

[0024] △L=a*X+b*Y+c*Z,

[0025] Among them, △L is the state evaluation value of the water pump shaft, a is the vibration coefficient of the water pump shaft, X is the vibration evaluation score of the water pump shaft, b is the temperature coefficient of the water pump shaft, Y is the temperature evaluation score of the water pump shaft, c is the displacement coefficient of the water pump shaft, and Z is the displacement evaluation score of the water pump shaft.

[0026] Furthermore, the processing module is used to obtain the state evaluation value ΔL of the water pump shaft, and the control module is used to control the rotation speed of the motor;

[0027] The processing module is also used to set a first preset state evaluation value L1, a second preset state evaluation value L2, a third preset state evaluation value L3 and a fourth preset state evaluation value L4, and L1<L2<L3<L4; the processing module is also used to set a first preset real-time speed B1, a second preset real-time speed B2, a third preset real-time speed B3 and a fourth preset real-time speed B4, and B1<B2<B3<B4;

[0028] According to the magnitude relationship between the acquired state evaluation value △L of the water pump shaft and the set state evaluation preset value Li, a preset speed Bi is selected as the speed of the motor;

[0029] When △L≤L1, the first preset speed B1 is selected as the speed of the motor;

[0030] When L1<△L≤L2, the second preset speed B2 is selected as the speed of the motor;

[0031] When L2<△L≤L3, the third preset speed B3 is selected as the speed of the motor;

[0032] When L3<ΔL≤L4, the fourth preset speed B4 is selected as the speed of the motor.

[0033] Furthermore, the processing module is also used to set the vibration threshold, temperature threshold and displacement threshold of the water pump shaft. When any two or more of the vibration data, temperature data and displacement data of the water pump shaft exceed the corresponding vibration threshold, temperature threshold and displacement threshold, it is determined that the water pump shaft is broken, and a work instruction to cut off the power connection between the motor and the water pump shaft is sent to the control module. The control module is used to control the protection device to instantly cut off the power connection between the motor and the water pump shaft.

[0034] Furthermore, the protection device comprises:

[0035] A detachable coupling is connected between the motor and the water pump shaft. The detachable coupling is separated after the water pump shaft breaks, so as to disconnect the motor from the water pump shaft and cut off the power connection between the motor and the water pump shaft.

[0036] A brake ring is sleeved on the water pump shaft, and the brake ring is used to brake the water pump shaft.

[0037] Compared with the prior art, the water pump broken shaft protection control system according to the embodiment of the present invention has the following beneficial effects:

[0038] The present invention detects and judges the parameters of the water pump shaft to discover the abnormal state of the water pump shaft in advance, so as to slow down the rotation speed of the motor and reduce the serious abnormal phenomenon of the water pump shaft, thereby playing a role of early protection. In addition, the present invention can detect the moment when the water pump shaft breaks, and promptly cut off the power connection between the motor and the water pump shaft to avoid the water pump continuing to run after the shaft breaks, causing further damage, thereby reducing the risk of accidents. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] Figure 1 This is a block diagram of the structure of a water pump broken shaft protection control system according to an embodiment of the present invention;

[0040] Figure 2 It is a structural block diagram of the sensor unit of the water pump broken shaft protection control system in an embodiment of the present invention;

[0041] Figure 3 It is a block diagram of the structure of the control unit of the water pump broken shaft protection control system in an embodiment of the present invention. DETAILED DESCRIPTION

[0042] The specific implementation methods of the present application are further described in detail below in conjunction with the accompanying drawings and examples. The following examples are used to illustrate the present invention, but are not intended to limit the scope of the present invention.

[0043] In the description of the present application, it should be understood that the terms "center", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0044] The terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of this application, unless otherwise specified, "plurality" means two or more.

[0045] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0046] like Figure 1 As shown, in an embodiment of the present application, a water pump broken shaft protection control system is provided, comprising: a water pump shaft; a motor connected to the water pump shaft, the motor being used to drive the water pump shaft to rotate; a sensor unit arranged on the water pump, the sensor unit being used to detect various parameter data of the water pump shaft; a protection device arranged on the water pump shaft, the protection device being used to cut off the power connection between the motor and the water pump shaft after the water pump shaft breaks; a control unit being used to judge the state of the water pump shaft according to the detected parameter data, and to control the working conditions of the motor and the protection device according to the state of the water pump shaft.

[0047] Furthermore, by detecting and judging the parameters of the water pump shaft, the abnormal state of the water pump shaft can be discovered in advance, so as to slow down the rotation speed of the motor and reduce the serious abnormal phenomena of the water pump shaft, thereby playing a role of early protection. In addition, the present invention can also detect the moment when the water pump shaft breaks, and promptly cut off the power connection between the motor and the water pump shaft to avoid the water pump continuing to run after the shaft breaks, causing further damage, thereby reducing the risk of accidents.

[0048] like Figure 2 As shown, in an embodiment of the present application, a water pump broken shaft protection control system is provided, and the sensor unit includes: a vibration sensor for detecting the vibration data of the water pump shaft in real time; a temperature sensor for detecting the temperature data of the water pump shaft in real time; a displacement sensor for detecting the displacement data of the water pump shaft in real time; the vibration sensor, temperature sensor, and displacement sensor are electrically connected to the control unit respectively.

[0049] Specifically, the vibration of the water pump shaft is monitored by a vibration sensor. Under normal circumstances, the vibration amplitude of the water pump should be within a normal range. If the water pump shaft is abnormal and there is a tendency for the shaft to break, the vibration signal will change to a certain extent and exceed the preset value, so that the speed of the motor can be increased and slowed down to avoid shaft breakage; the shaft displacement of the water pump shaft is monitored by a displacement sensor. Under normal circumstances, the shaft displacement of the water pump should be within a normal range. If the water pump shaft is abnormal, the displacement of the water pump shaft will change to a certain extent and exceed the preset value, so that the speed of the motor can be increased and slowed down to avoid shaft breakage; the temperature change of the water pump shaft is monitored by a temperature sensor. Under normal circumstances, the temperature of the water pump shaft should be stable within a normal range. If the water pump shaft is abnormal, the temperature will rise due to changes in friction and energy conversion, exceeding the preset value, so that the speed of the motor can be increased and slowed down to avoid shaft breakage.

[0050] like Figure 3 As shown, in an embodiment of the present application, a water pump broken shaft protection control system is provided, and the control unit includes: an acquisition module, used to collect vibration data, temperature data and displacement data of the water pump shaft; a processing module, connected to the acquisition module, and the processing module is used to set the working instructions of the motor and the protection device according to the detected parameter data; a control module, connected to the processing module, and the control module is used to control the motor and the protection device to work according to the working instructions.

[0051] In an embodiment of the present application, a water pump broken shaft protection control system is provided, wherein the processing module is used to obtain vibration data, temperature data and displacement data of the water pump shaft, and to respectively assign corresponding evaluation scores to the vibration data, temperature data and displacement data according to the numerical values ​​corresponding to each data, so as to obtain vibration evaluation scores, temperature evaluation scores and displacement evaluation scores; the processing module is also used to set a vibration preset value, a temperature preset value and a displacement preset value of the water pump shaft, and to subtract the vibration data, temperature data and displacement data of the water pump shaft from the corresponding vibration preset value, temperature preset value and displacement preset value, so as to obtain corresponding vibration difference values, temperature difference values ​​and displacement difference values; the processing module is also used to determine corresponding weight coefficients according to the numerical values ​​of the vibration difference value, temperature difference value and displacement difference values, so as to obtain vibration coefficients, temperature coefficients and displacement coefficients; the processing module is also used to determine the state evaluation value of the water pump shaft according to the vibration evaluation score, temperature evaluation score and displacement evaluation score and the corresponding vibration coefficients, temperature coefficients and displacement coefficients.

[0052] Specifically, by comprehensively analyzing the monitoring results of the three parameters of vibration, temperature and displacement, it is determined whether the vibration, displacement and temperature monitoring results have exceeded the set preset values, and how large the excess range is. It is possible to accurately determine whether the status of the water pump shaft is normal, so as to take corresponding actions in advance and reduce the occurrence of water pump shaft breakage.

[0053] In an embodiment of the present application, a water pump broken shaft protection control system is provided, and the calculation formula of the state evaluation value of the water pump shaft is:

[0054] △L=a*X+b*Y+c*Z,

[0055] Among them, △L is the state evaluation value of the water pump shaft, a is the vibration coefficient of the water pump shaft, X is the vibration evaluation score of the water pump shaft, b is the temperature coefficient of the water pump shaft, Y is the temperature evaluation score of the water pump shaft, c is the displacement coefficient of the water pump shaft, and Z is the displacement evaluation score of the water pump shaft.

[0056] In an embodiment of the present application, a water pump broken shaft protection control system is provided, wherein the processing module is used to obtain a state evaluation value △L of the water pump shaft, and the control module is used to control the speed of the motor;

[0057] The processing module is also used to set a first preset state evaluation value L1, a second preset state evaluation value L2, a third preset state evaluation value L3 and a fourth preset state evaluation value L4, and L1<L2<L3<L4; the processing module is also used to set a first preset real-time speed B1, a second preset real-time speed B2, a third preset real-time speed B3 and a fourth preset real-time speed B4, and B1<B2<B3<B4;

[0058] According to the magnitude relationship between the acquired state evaluation value △L of the water pump shaft and the set state evaluation preset value Li, a preset speed Bi is selected as the speed of the motor;

[0059] When △L≤L1, the first preset speed B1 is selected as the speed of the motor;

[0060] When L1<△L≤L2, the second preset speed B2 is selected as the speed of the motor;

[0061] When L2<△L≤L3, the third preset speed B3 is selected as the speed of the motor;

[0062] When L3<ΔL≤L4, the fourth preset speed B4 is selected as the speed of the motor.

[0063] Specifically, the smaller the state evaluation value of the water pump shaft is, the more abnormal the state of the water pump shaft is. The speed of the motor needs to be slowed down to prevent the speed from being too fast and causing the water pump shaft to break, so as to ensure that the water pump can continue to operate normally.

[0064] In an embodiment of the present application, a water pump broken shaft protection control system is provided, and the processing module is also used to set the vibration threshold, temperature threshold and displacement threshold of the water pump shaft. When any two or more of the vibration data, temperature data and displacement data of the water pump shaft exceed the corresponding vibration threshold, temperature threshold and displacement threshold, it is determined that the water pump shaft is broken, and a work instruction to cut off the power connection between the motor and the water pump shaft is sent to the control module. The control module is used to control the protection device to instantly cut off the power connection between the motor and the water pump shaft.

[0065] Specifically, the vibration of the water pump shaft is monitored by a vibration sensor. Under normal circumstances, the vibration amplitude of the water pump should be within the normal range. If the water pump shaft is broken, the vibration signal will change significantly and exceed the preset threshold, so that the occurrence of broken shaft can be preliminarily determined; the displacement of the water pump shaft is monitored by a displacement sensor. Under normal circumstances, the displacement of the water pump shaft should be within the normal range. If the water pump shaft is broken, the displacement of the water pump shaft will change significantly and exceed the set threshold range, thereby further confirming the occurrence of broken shaft; the temperature change of the water pump shaft is monitored by a temperature sensor. Under normal circumstances, the temperature of the water pump shaft should be stable within the normal range. If the water pump shaft is broken, the change in friction and energy conversion will cause the temperature to rise and exceed the set threshold range, thereby providing additional confirmation of broken shaft. And in order to avoid the phenomenon of false alarm of broken shaft, only when any two or more of them exceed the corresponding threshold value will it be confirmed that the water pump shaft is broken.

[0066] In an embodiment of the present application, a water pump broken shaft protection control system is provided, and the protection device includes: a detachable coupling connected between the motor and the water pump shaft, the detachable coupling is separated after the water pump shaft breaks to disconnect the motor from the water pump shaft and cut off the power connection between the motor and the water pump shaft; a brake ring is sleeved on the water pump shaft, and the brake ring is used to brake the water pump shaft.

[0067] Specifically, the detachable coupling can be separated after the water pump shaft breaks, and the separation can disconnect the connection between the motor and the water pump shaft, thereby cutting off the power connection between the motor and the water pump shaft; after the power connection between the motor and the water pump shaft is cut off, the water pump shaft will continue to rotate due to inertia, so the brake ring is provided and sleeved on the water pump shaft. The water pump shaft can be locked immediately after the water pump shaft breaks to avoid further damage to the entire device.

[0068] In summary, the embodiment of the present invention provides a water pump broken shaft protection control system, which includes: a water pump shaft; a motor connected to the water pump shaft, used to drive the water pump shaft to rotate; a sensor unit, arranged on the water pump, used to detect various parameter data of the water pump shaft; a protection device, arranged on the water pump shaft, used to cut off the power connection between the motor and the water pump shaft after the water pump shaft breaks; a control unit, used to judge the state of the water pump shaft according to the detected parameter data, and control the working conditions of the motor and the protection device according to the state of the water pump shaft. The present invention detects and judges the parameters of the water pump shaft, finds the abnormal state of the water pump shaft in advance, slows down the speed of the motor, reduces the serious abnormal phenomenon of the water pump shaft, plays the role of early protection, and the present invention can also detect the moment when the water pump shaft breaks, and promptly cut off the power connection between the motor and the water pump shaft, so as to avoid the water pump continuing to run after the shaft breaks, causing further damage, and reduce the risk of accidents.

[0069] Finally, it should be noted that it is obvious that those skilled in the art can make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include these modifications and variations.

[0070] The above is only an example of implementation of the present invention, but it cannot be used to limit the scope of the present invention. Any structural changes made according to the present invention, as long as they do not lose the essence of the present invention, should be regarded as falling within the scope of protection of the present invention and being restricted. Those skilled in the art can clearly understand that for the convenience and simplicity of description, the specific working process and related instructions of the system described above can refer to the corresponding process in the aforementioned method embodiment, and will not be repeated here.

[0071] The term "comprise" or any other similar term is intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus / device that includes a list of elements includes not only those elements but also other elements not expressly listed, or also includes elements inherent to such process, method, article, or apparatus / device.

[0072] So far, the technical solutions of the present invention have been described in conjunction with the further embodiments shown in the accompanying drawings, but it is easy for those skilled in the art to understand that the protection scope of the present invention is obviously not limited to these specific embodiments. Without departing from the principle of the present invention, those skilled in the art can make equivalent changes or substitutions to the relevant technical features, and the technical solutions after these changes or substitutions will fall within the protection scope of the present invention.

[0073] The above description is only a preferred embodiment of the present invention and is not intended to limit the protection scope of the present invention.

Claims

1. A water pump broken shaft protection control system, characterized in that: include: Water pump shaft; A motor connected to the water pump shaft, the motor being used to drive the water pump shaft to rotate; A sensor unit, arranged on the water pump, and used for detecting various parameter data of the water pump shaft; A protection device, arranged on the water pump shaft, and used for cutting off the power connection between the motor and the water pump shaft after the water pump shaft breaks; The control unit is used to determine the state of the water pump shaft according to the detected parameter data, and control the working conditions of the motor and the protection device according to the state of the water pump shaft.

2. A water pump broken shaft protection control system according to claim 1, characterized in that: The sensor unit comprises: A vibration sensor, used for detecting vibration data of the water pump shaft in real time; A temperature sensor, used for detecting the temperature data of the water pump shaft in real time; A displacement sensor, used for detecting the displacement data of the water pump shaft in real time; The vibration sensor, temperature sensor and displacement sensor are electrically connected to the control unit respectively.

3. A water pump broken shaft protection control system according to claim 2, characterized in that: The control unit comprises: An acquisition module, used for acquiring vibration data, temperature data and displacement data of the water pump shaft; A processing module connected to the acquisition module, the processing module is used to set working instructions of the motor and the protection device according to the detected parameter data; A control module is connected to the processing module, and is used to control the motor and the protection device to work according to a working instruction.

4. A water pump broken shaft protection control system according to claim 3, characterized in that: The processing module is used to obtain the vibration data, temperature data and displacement data of the water pump shaft, and to assign corresponding evaluation scores to the vibration data, temperature data and displacement data according to the corresponding numerical values ​​of each data, so as to obtain the vibration evaluation score, temperature evaluation score and displacement evaluation score; The processing module is also used to set the vibration preset value, temperature preset value and displacement preset value of the water pump shaft, and to subtract the vibration data, temperature data and displacement data of the water pump shaft from the corresponding vibration preset value, temperature preset value and displacement preset value to obtain the corresponding vibration difference value, temperature difference value and displacement difference value; The processing module is also used to determine corresponding weight coefficients according to the numerical values ​​of the vibration difference, temperature difference and displacement difference, and obtain a vibration coefficient, a temperature coefficient and a displacement coefficient; The processing module is also used to determine the state evaluation value of the water pump shaft according to the vibration evaluation score, temperature evaluation score and displacement evaluation score and the corresponding vibration coefficient, temperature coefficient and displacement coefficient.

5. A water pump broken shaft protection control system according to claim 4, characterized in that: The calculation formula of the state evaluation value of the water pump shaft is: △L=a*X+b*Y+c*Z, Among them, △L is the state evaluation value of the water pump shaft, a is the vibration coefficient of the water pump shaft, X is the vibration evaluation score of the water pump shaft, b is the temperature coefficient of the water pump shaft, Y is the temperature evaluation score of the water pump shaft, c is the displacement coefficient of the water pump shaft, and Z is the displacement evaluation score of the water pump shaft.

6. A water pump broken shaft protection control system according to claim 4, characterized in that: The processing module is used to obtain the state evaluation value ΔL of the water pump shaft, and the control module is used to control the speed of the motor; The processing module is also used to set a first preset state evaluation value L1, a second preset state evaluation value L2, a third preset state evaluation value L3 and a fourth preset state evaluation value L4, and L1<L2<L3<L4; the processing module is also used to set a first preset real-time speed B1, a second preset real-time speed B2, a third preset real-time speed B3 and a fourth preset real-time speed B4, and B1<B2<B3<B4; According to the magnitude relationship between the acquired state evaluation value △L of the water pump shaft and the set state evaluation preset value Li, a preset speed Bi is selected as the speed of the motor; When △L≤L1, the first preset speed B1 is selected as the speed of the motor; When L1<△L≤L2, the second preset speed B2 is selected as the speed of the motor; When L2<△L≤L3, the third preset speed B3 is selected as the speed of the motor; When L3<ΔL≤L4, the fourth preset speed B4 is selected as the speed of the motor.

7. A water pump broken shaft protection control system according to claim 3, characterized in that: The processing module is also used to set the vibration threshold, temperature threshold and displacement threshold of the water pump shaft. When any two or more of the vibration data, temperature data and displacement data of the water pump shaft exceed the corresponding vibration threshold, temperature threshold and displacement threshold, it is determined that the water pump shaft is broken, and a work instruction to cut off the power connection between the motor and the water pump shaft is sent to the control module. The control module is used to control the protection device to instantly cut off the power connection between the motor and the water pump shaft.

8. A water pump broken shaft protection control system according to claim 1, characterized in that: The protection device comprises: A detachable coupling is connected between the motor and the water pump shaft. The detachable coupling is separated after the water pump shaft breaks, so as to disconnect the motor from the water pump shaft and cut off the power connection between the motor and the water pump shaft. A brake ring is sleeved on the water pump shaft, and the brake ring is used to brake the water pump shaft.

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