Self-priming pump and control method thereof

Abstract

The invention relates to the technical field of self-priming pumps, in particular to a self-priming pump and a control method thereof.The self-priming pump comprises a pump body, a liquid storage cavity is formed in the pump body; the controller is arranged on the pump body; the liquid level sensing assembly is arranged in the liquid storage cavity and connected with the controller, and the liquid level sensing assembly is used for detecting the real-time liquid level height in the liquid storage cavity, generating a signal and transmitting the signal to the controller; the air exhaust assembly comprises a vacuum pump and a channel which are arranged on the outer side of the liquid storage cavity, and the vacuum pump is connected with the controller; one end of the channel is communicated with the liquid storage cavity, and the other end is connected with the vacuum pump; after the power supply is switched on, if the liquid level height in the liquid storage cavity is lower than a first preset height, the liquid level sensing assembly generates a first signal and transmits the first signal to the controller, and the controller controls the vacuum pump to start working. The vacuum pump is adopted for pumping air, and the self-suction speed is greatly increased.

Description

Technical Field

[0001] This invention relates to the field of self-priming pump technology, and in particular to a self-priming pump and its control method. Background Technology

[0002] A centrifugal pump is a fluid machine that uses the centrifugal force generated by the rotation of an impeller to transport liquids. It is widely used in urban sewage, farmland irrigation, oil transportation, marine vessels and chemical industries. A self-priming pump is a special type of centrifugal pump. Its main function is to use its self-priming ability to draw liquids from a low position or a position with a certain degree of vacuum into the pump body, and then use the centrifugal force generated by the rotation of the impeller to transport the liquids to the target position.

[0003] The self-priming pump consists of a suction chamber, a liquid storage chamber, a vortex chamber, a return hole, and a gas-liquid separation chamber. Its working principle is as follows: Before starting the pump, fill the pump casing with water (or the pump casing itself contains water). After starting, the impeller rotates at high speed, causing the water in the impeller channel to flow towards the vortex. At this time, a vacuum is formed at the inlet, which opens the inlet check valve, allowing air in the suction pipe to enter the pump and reach the outer edge through the impeller channel. No foot valve needs to be installed in the pipeline. Before operation, it is only necessary to keep a certain amount of priming liquid in the pump body. Different self-priming pumps made of different materials can be used for different liquids.

[0004] Patent No. 202210811966.8 discloses a self-priming pump that can quickly and effectively separate gas-liquid mixtures by setting up a labyrinth gas-liquid separation channel. However, when using the self-priming pump of the above patent, the liquid cannot flow into the pump chamber by gravity when the water level is lower than the pump head (i.e., the self-priming pump is installed above the water source). For example, when drawing water from a well or storage tank underground, water needs to be manually injected into the pump chamber to fill the empty sections of the suction pipe and pump chamber. If the water source is lower than the pump body and the distance is too far (e.g., more than 6 meters), multiple manual water injections may be required, making the operation quite cumbersome. Summary of the Invention

[0005] The purpose of this disclosure is to provide a self-priming pump and its control method to solve the problems mentioned in the background art.

[0006] To achieve the above objectives, this disclosure provides the following technical solution: In a first aspect, this application provides a self-priming pump, comprising: The pump body has a liquid storage chamber inside; The controller is located on the pump body; A liquid level sensing component is disposed in the liquid storage chamber and connected to the controller. The liquid level sensing component is used to detect the real-time liquid level height in the liquid storage chamber and generate a signal to be transmitted to the controller. The vacuum pump assembly includes a vacuum pump and a channel located outside the liquid storage chamber, wherein the vacuum pump is connected to a controller; One end of the channel is connected to the liquid storage chamber, and the other end is connected to the vacuum pump; When the power is turned on, if the liquid level in the storage chamber is lower than the first preset height, the liquid level sensing component generates a first signal and transmits it to the controller, which then controls the vacuum pump to start working.

[0007] In some embodiments, the liquid level sensing component includes a first liquid level sensor and a second liquid level sensor arranged at intervals along a vertical direction, with the first liquid level sensor located above the second liquid level sensor, and the first liquid level sensor and the second liquid level sensor being electrically connected to the controller respectively.

[0008] In a preferred embodiment, a float is also provided in the liquid storage chamber, and the first liquid level sensor and the second liquid level sensor are Hall sensors, which are arranged on the movement trajectory of the float.

[0009] The first and second liquid level sensors of this application are configured as Hall sensors. There is no mechanical contact between the Hall sensor and the float, eliminating the risk of failure caused by liquid corrosion or impurities in traditional electrode / float switches. In addition, the Hall sensor has low dependence on the medium, and the stability of the magnetic field signal remains unchanged regardless of whether the liquid is clear or turbid.

[0010] In a preferred embodiment, a permanent magnet is embedded inside the float. When the float moves to the sensing area of ​​the first liquid level sensor or the second liquid level sensor, it triggers the corresponding Hall electromotive force signal.

[0011] In a preferred embodiment, the system further includes an impeller and a drive motor. The impeller is disposed in the liquid storage chamber, and the impeller is connected to the drive motor via a drive shaft. The drive motor is connected to a controller.

[0012] In a preferred embodiment, the working process of the self-priming pump includes an initial start-up stage and an impeller operation stage. During the initial start-up stage, if the float is lower than the first preset height, the first liquid level sensor generates a first signal and transmits it to the controller, which then controls the vacuum pump to start working. After the vacuum pump starts working, the liquid level in the storage chamber rises, and the float rises accordingly. When the float rises to the first preset height, the first liquid level sensor generates a second signal and transmits it to the controller, which then controls the vacuum pump to stop working.

[0013] In a preferred embodiment, during the impeller operation phase, if the float is below the second preset height, the second liquid level sensor generates a first signal and transmits it to the controller, which then controls the vacuum pump to start working. After the vacuum pump starts working, the liquid level in the storage chamber rises, and the float rises accordingly. When the float rises to the first preset height, the first liquid level sensor generates a second signal and transmits it to the controller, which then controls the vacuum pump to stop working.

[0014] In a preferred embodiment, the first preset height is the sensing area of ​​the first liquid level sensor; the second preset height is the sensing area of ​​the second liquid level sensor.

[0015] In a preferred embodiment, the pump body includes a head and a tail, the liquid storage chamber is located in the head, and the tail is provided with an assembly space for assembling a battery.

[0016] In a preferred embodiment, the pump body is further provided with a receiving cavity and a liquid inlet. The water inlet end of the receiving cavity is connected to the liquid inlet, and the water outlet end of the receiving cavity is connected to the liquid storage cavity. A filter cup is detachably installed in the receiving cavity.

[0017] Compared with the prior art, the beneficial effects of the present invention are as follows: the liquid level in the storage chamber is monitored in real time by a liquid level sensing component. Once the liquid level is detected to be lower than a specified height, the controller is triggered to start the vacuum pump. The vacuum pump actively draws air from the storage chamber through the channel, creating a negative pressure environment in the storage chamber. The external atmospheric pressure forces the liquid into the storage chamber, thereby enabling the self-priming pump to automatically complete the liquid injection without manual intervention, thus achieving fully automatic start-up operation in an unmanned state. Traditional self-priming pumps rely on the impeller to agitate the gas-liquid mixture to naturally expel air, which takes as long as 3-5 minutes. This application uses a vacuum pump to draw air, which greatly improves the self-priming speed. In addition, the vacuum environment created by the vacuum pump for the storage chamber enables the self-priming pump to achieve a suction lift of 8 meters when starting without water.

[0018] Secondly, this application provides a control method for a self-priming pump, including control during the initial start-up phase and control during the impeller operation phase, wherein... The control during the initial startup phase includes: S11: After powering on, check if the float is below the first preset height; S12: If the float is lower than the first preset height, the controller will start the vacuum pump; S13: When the float rises to the first preset height, the controller shuts off the vacuum pump. The control during the impeller operation phase includes: S21: After the vacuum pump is turned off, check whether the float is lower than the second preset height; S22: If the float is lower than the second preset height, the controller will start the vacuum pump; S23: When the float rises to the first preset height, the controller controls the vacuum pump to shut down.

[0019] In a preferred embodiment, during the initial start-up phase, in steps S11 and S12, the position of the float is detected by a first liquid level sensor, where the first preset height is the sensing area of ​​the first liquid level sensor. If the float is below the first preset height, the first liquid level sensor generates a first signal and transmits it to the controller. During the impeller operation phase, in steps S21 and S22, the position of the float is detected by a second liquid level sensor, where the second preset height is the sensing area of ​​the second liquid level sensor. If the float is below the second preset height, the second liquid level sensor generates a first signal and transmits it to the controller. In steps S13 and S23, the position of the float is detected by the first liquid level sensor. If the float rises to the first preset height, the first liquid level sensor generates a second signal and transmits it to the controller.

[0020] Compared with existing technologies, in the initial stage, the vacuum pump is started by detecting whether the float is below the first preset height. This can quickly establish a vacuum environment in the liquid storage chamber, allowing the liquid to be rapidly drawn into the pump. Without manual intervention, the self-priming pump can automatically complete the liquid injection. When the float rises to the first preset height, the vacuum pump shuts off, avoiding excessive pumping that could lead to an excessively high liquid level or abnormal pump pressure, ensuring the high efficiency and stability of the self-priming process. During the impeller operation stage, the vacuum pump is started by detecting whether the float is below the second preset height. This ensures that a sufficient vacuum is maintained in the liquid storage chamber throughout the delivery process, allowing the liquid to be continuously and stably delivered. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the structure of a self-priming pump according to this application; Figure 2 This is one of the cross-sectional views of a self-priming pump according to this application; Figure 3 This is a second cross-sectional view of a self-priming pump according to this application; Figure 4 This is the third cross-sectional view of a self-priming pump according to this application; Figure 5 This is the fourth cross-sectional view of a self-priming pump according to this application.

[0022] In the diagram: 1. Pump body; 2. First liquid level sensor; 3. Second liquid level sensor; 4. Vacuum pump; 5. Channel; 6. Float; 7. Impeller; 8. Drive motor; 9. Battery; 10. Filter cup. Detailed Implementation

[0023] To enable those skilled in the art to better understand the technical solutions of this disclosure, the following detailed, clear, and complete description of this disclosure is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of this disclosure and are not intended to limit it.

[0024] Those skilled in the art should understand that, in the disclosure of this invention, the terms "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, the above terms should not be construed as limiting this invention.

[0025] The "self-priming" of a self-priming pump relies on residual priming liquid in the pump's storage chamber to create initial gas-liquid mixing and centrifugal force. After impeller 7 starts, the priming liquid is thrown towards the outer edge of impeller 7 under centrifugal force, creating a vacuum low-pressure zone (pressure lower than atmospheric pressure) at the center of impeller 7. If the priming liquid is insufficient, the center of impeller 7 cannot be completely filled with liquid, and a large amount of air will be drawn in during rotation, resulting in insufficient vacuum and inability to effectively draw in external liquid. Therefore, before starting the impeller 7 of a self-priming pump, it is often necessary to manually inject liquid into the storage chamber to ensure sufficient priming liquid, a method that is inconvenient.

[0026] For this purpose, please refer to Figures 1-3 As shown, this application discloses a self-priming pump, including a pump body 1, a controller, and a vacuum pump assembly. The pump body 1 has a liquid storage chamber inside, and the controller is mounted on the pump body 1. A liquid level sensing component is installed in the liquid storage chamber and is electrically connected to the controller. The liquid level sensing component is used to detect the real-time liquid level height in the liquid storage chamber and generate a signal that is transmitted to the controller. The vacuum pump assembly includes a vacuum pump 4 and a channel 5 located outside the liquid storage chamber. The vacuum pump 4 is electrically connected to the controller, and the channel 5 is a vacuum pipe. One end of the channel 5 is connected to the liquid storage chamber, and the other end is connected to the vacuum pump 4. When the power is turned on, if the liquid level height in the liquid storage chamber is lower than a first preset height, the liquid level sensing component generates a first signal that is transmitted to the controller, and the controller controls the vacuum pump 4 to start working. This application uses a liquid level sensor to monitor the liquid level in the storage chamber in real time. Once the liquid level is detected to be lower than a specified height, the controller is triggered to start the vacuum pump 4. The vacuum pump 4 actively draws air from the storage chamber through the channel 5, creating a negative pressure environment in the storage chamber. The external atmospheric pressure forces the liquid into the storage chamber, thus enabling the self-priming pump to automatically complete the liquid injection without manual intervention, thereby achieving fully automatic start-up operation in an unmanned state. Traditional self-priming pumps rely on the impeller 7 to stir the gas-liquid mixture and naturally expel air, which takes as long as 3-5 minutes. This application uses the vacuum pump 4 to draw air, which greatly improves the self-priming speed.

[0027] Specifically, channel 5 has an "L" or "Z" shaped structure, with one end of channel 5 connected to the top gas phase zone of the liquid storage chamber to prevent liquid backflow. To ensure the stability of vacuum pump 4, vacuum pump 4 is located at the bottom of the inner cavity of pump body 1, and at least two shock-absorbing ridges are provided at the bottom of the inner cavity of pump body 1, with vacuum pump 4 mounted on the ridges.

[0028] Please refer to the following: Figure 4 and Figure 5 As shown, the liquid level sensing assembly includes a first liquid level sensor 2 and a second liquid level sensor 3 arranged vertically at intervals, with the first liquid level sensor 2 located above the second liquid level sensor 3. The first liquid level sensor 2 and the second liquid level sensor 3 are electrically connected to the controller. Specifically, the inner wall of the liquid storage chamber has a first mounting interface and a second mounting interface arranged vertically. The first liquid level sensor 2 is installed in the first mounting interface, and the second liquid level sensor 3 is installed in the second mounting interface. The specific installation method is prior art and will not be described further here. It should be noted that the liquid level sensing assembly in this application is typically electronic, but can also be a mechanical switch type.

[0029] Preferably, a float 6 is also provided in the liquid storage chamber, and the first liquid level sensor 2 and the second liquid level sensor 3 are Hall sensors, which are positioned on the movement trajectory of the float 6. A permanent magnet is embedded inside the float 6. When the float 6 moves to the sensing area of ​​the first liquid level sensor 2 or the second liquid level sensor 3, it triggers the corresponding Hall electromotive force signal. In this application, the first liquid level sensor 2 and the second liquid level sensor 3 are configured as Hall sensors, eliminating mechanical contact between the Hall sensors and the float 6, thus eliminating the failure risk caused by liquid corrosion or impurities in traditional electrode / float 6 switches. Furthermore, the Hall sensors have low dependence on the medium; the stability of the magnetic field signal remains unchanged regardless of whether the liquid is clear or turbid.

[0030] In one embodiment of this disclosure, an impeller 7 and a drive motor 8 are also included. The impeller 7 is disposed in the liquid storage chamber and is connected to the drive motor 8 via a drive shaft. The drive motor 8 is electrically connected to the controller. The operation of the self-priming pump includes an initial start-up stage and an impeller 7 operation stage. During the initial start-up stage, if the float 6 is lower than a first preset height, the first liquid level sensor 2 generates a first signal and transmits it to the controller, which then controls the vacuum pump 4 to start working. After the vacuum pump 4 starts working, the liquid level in the liquid storage chamber rises, and the float 6 rises accordingly. When the float 6 rises to the first preset height, the first liquid level sensor 2 generates a second signal and transmits it to the controller, which then controls the vacuum pump 4 to stop working. The main function of the vacuum pump 4 is to establish a negative pressure environment in the liquid storage chamber by pumping air, thereby achieving self-priming of the liquid. It can be understood that the initial start-up stage is the stage before the impeller 7 starts after the power is turned on (the impeller 7 has not yet started working), and the impeller 7 operation stage is the working stage after the impeller 7 starts (including the self-priming stage and the normal infusion stage). In the initial stage of self-priming pump startup (i.e., initial start-up stage), there is usually not enough liquid in the storage chamber. Vacuum pump 4 reduces the pressure in the storage chamber by pumping air, so that external liquid is drawn into the storage chamber under atmospheric pressure. In this way, it is possible to avoid manually injecting liquid into the storage chamber.

[0031] Furthermore, during the impeller 7 operation phase, if the float 6 is below the second preset height, the second liquid level sensor 3 generates a first signal and transmits it to the controller, which then controls the vacuum pump 4 to start operating. After the vacuum pump 4 starts operating, the liquid level in the storage chamber rises, and the float 6 rises accordingly. When the float 6 rises to the first preset height, the first liquid level sensor 2 generates a second signal and transmits it to the controller, which then controls the vacuum pump 4 to stop operating. The self-priming pump's operation is divided into an initial start-up phase and an impeller 7 operation phase, with differentiated liquid level detection strategies set for different phases to enhance the reliability of the self-priming pump. Specifically, the first preset height is the sensing area of ​​the first liquid level sensor 2; the second preset height is the sensing area of ​​the second liquid level sensor 3.

[0032] Understandably, the first signal is a replenishment request signal generated by the first liquid level sensor 2 or the second liquid level sensor 3 by detecting the height of the float 6; the second signal is a request signal to stop replenishing liquid. The first preset height is the minimum safe liquid level height covering the impeller 7; the second preset height is the minimum liquid level height to maintain the self-priming function. When the self-priming pump is initially started, the liquid level in the storage chamber is usually lower than the first preset height or even empty. Using the high-level first liquid level sensor 2 as the starting condition for the vacuum pump 4 ensures that the vacuum pump 4 continues to work until the liquid level completely covers the impeller 7 (minimum safe liquid level height), avoiding the self-priming pump from failing to self-prime due to the vacuum pump 4 stopping too early. During the impeller 7 operation phase, the low-level second liquid level sensor 3 is used as the starting condition. The vacuum pump 4 is only started when the liquid level drops to the minimum critical height to maintain siphon (the minimum liquid level height to maintain the self-priming function), reducing the number of ineffective pumping operations.

[0033] like Figure 5 As shown, the pump body 1 includes a head and a tail. The liquid storage chamber is located in the head, and the tail has an assembly space for assembling the battery 9. Positioning the liquid storage chamber in the head and the battery 9 in the tail effectively creates a balanced torque between the head and tail, reducing vibration during operation of the self-priming pump. Furthermore, the liquid storage chamber and the battery 9 are essentially physically separated, enhancing safety.

[0034] Preferably, the pump body 1 is further provided with a receiving cavity and a liquid inlet. The water inlet end of the receiving cavity is connected to the liquid inlet, and the water outlet end of the receiving cavity is connected to the liquid storage cavity. A filter cup 10 is detachably installed in the receiving cavity. Before the liquid enters the liquid storage cavity, the filter cup 10 filters it to remove particulate impurities, suspended solids, or foreign objects from the liquid. On the one hand, this can avoid the influence of impurities on the first liquid level sensor 2 and the second liquid level sensor 3, preventing misjudgment by the first liquid level sensor 2 and the second liquid level sensor 3 due to impurities. On the other hand, it reduces the wear and corrosion of impurities on the impeller 7, seals, etc., reducing the failure rate and extending the service life.

[0035] This application also discloses a control method for a self-priming pump, including control during the initial start-up stage and control during the impeller 7 operation stage, wherein... Initial control measures include: S11: After powering on, check whether the float 6 is below the first preset height; S12: If the float 6 is lower than the first preset height, the controller will start the vacuum pump 4. S13: When the float 6 rises to the first preset height, the controller controls the vacuum pump 4 to shut down; The control of impeller 7 during its operation includes: S21: After vacuum pump 4 is turned off, check whether float 6 is lower than the second preset height; S22: If the float 6 is lower than the second preset height, the controller will start the vacuum pump 4. S23: When the float 6 rises to the first preset height, the controller controls the vacuum pump 4 to shut down.

[0036] Specifically, in the initial start-up phase, in steps S11 and S12, the position of the float 6 is detected by the first liquid level sensor 2, and the first preset height is the sensing area of ​​the first liquid level sensor 2. If the float 6 is lower than the first preset height, the first liquid level sensor 2 generates a first signal and transmits it to the controller. In the impeller 7 operation phase, in steps S21 and S22, the position of the float 6 is detected by the second liquid level sensor 3, and the second preset height is the sensing area of ​​the second liquid level sensor 3. If the float 6 is lower than the second preset height, the second liquid level sensor 3 generates a first signal and transmits it to the controller. In steps S13 and S23, the position of the float 6 is detected by the first liquid level sensor 2. If the float 6 rises to the first preset height, the first liquid level sensor 2 generates a second signal and transmits it to the controller.

[0037] In the initial stage, the vacuum pump 4 is started by detecting whether the float 6 is below the first preset height. This quickly establishes a vacuum environment in the liquid storage chamber, allowing the liquid to be rapidly drawn into the pump. Without manual intervention, the self-priming pump can automatically complete the liquid injection. When the float 6 rises to the first preset height, the vacuum pump 4 shuts off, preventing excessive pumping that could lead to an excessively high liquid level or abnormal pump pressure, thus ensuring the high efficiency and stability of the self-priming process. During the impeller 7 operation stage, the vacuum pump 4 is started by detecting whether the float 6 is below the second preset height. This ensures that a sufficient vacuum is maintained in the liquid storage chamber during the delivery process, allowing the liquid to be continuously and stably delivered.

[0038] The present application has been described in detail above. Specific examples have been used to illustrate the principles and implementation methods of the present application. The descriptions of the embodiments above are only for the purpose of helping to understand the present application and its core ideas. It should be noted that those skilled in the art can make several improvements and modifications to the present application without departing from the principles of the present application, and these improvements and modifications also fall within the protection scope of the claims of the present application.

Claims

1. A self-priming pump, characterized in that, include: Pump body (1), which has a liquid storage chamber inside; The controller is located on the pump body (1); A liquid level sensing component is disposed in the liquid storage chamber and connected to the controller. The liquid level sensing component is used to detect the real-time liquid level height in the liquid storage chamber and generate a signal to be transmitted to the controller. The vacuum pump assembly includes a vacuum pump (4) and a channel (5) located outside the liquid storage chamber, wherein the vacuum pump (4) is connected to the controller; One end of the channel (5) is connected to the liquid storage chamber, and the other end is connected to the vacuum pump (4); When the power is turned on, if the liquid level in the storage chamber is lower than the first preset height, the liquid level sensing component generates a first signal and transmits it to the controller, and the controller controls the vacuum pump (4) to start working.

2. The self-priming pump according to claim 1, characterized in that, The liquid level sensing component includes a first liquid level sensor (2) and a second liquid level sensor (3) arranged at intervals along the vertical direction, with the first liquid level sensor (2) located above the second liquid level sensor (3), and the first liquid level sensor (2) and the second liquid level sensor (3) being electrically connected to the controller respectively.

3. The self-priming pump according to claim 1, characterized in that, A float (6) is also provided in the liquid storage chamber. The first liquid level sensor (2) and the second liquid level sensor (3) are Hall sensors. The first liquid level sensor (2) and the second liquid level sensor (3) are set on the movement trajectory of the float (6).

4. The self-priming pump according to claim 3, characterized in that, It also includes an impeller (7) and a drive motor (8). The impeller (7) is located in the liquid storage chamber. The impeller (7) is connected to the drive motor (8) through a drive shaft. The drive motor (8) is connected to the controller.

5. The self-priming pump according to claim 1, characterized in that, The working process of the self-priming pump includes an initial start-up stage and an impeller (7) operation stage. During the initial start-up stage, if the float (6) is lower than the first preset height, the first liquid level sensor (2) generates a first signal and transmits it to the controller. The controller controls the vacuum pump (4) to start working. After the vacuum pump (4) starts working, the liquid level in the storage chamber rises, and the float (6) rises accordingly. When the float (6) rises to the first preset height, the first liquid level sensor (2) generates a second signal and transmits it to the controller. The controller controls the vacuum pump (4) to stop working.

6. The self-priming pump according to claim 5, characterized in that, When the impeller (7) is running, if the float (6) is lower than the second preset height, the second liquid level sensor (3) generates a first signal and transmits it to the controller, and the controller controls the vacuum pump (4) to start working. After the vacuum pump (4) starts working, the liquid level in the storage chamber rises, and the float (6) rises accordingly. When the float (6) rises to the first preset height, the first liquid level sensor (2) generates a second signal and transmits it to the controller, and the controller controls the vacuum pump (4) to stop working.

7. The self-priming pump according to claim 6, characterized in that, The first preset height is the sensing area of ​​the first liquid level sensor (2); the second preset height is the sensing area of ​​the second liquid level sensor (3).

8. The self-priming pump according to claim 1, characterized in that, The pump body (1) is also provided with a receiving cavity and a liquid inlet. The water inlet end of the receiving cavity is connected to the liquid inlet, and the water outlet end of the receiving cavity is connected to the liquid storage cavity. A filter cup (10) is detachably provided in the receiving cavity.

9. A control method for a self-priming pump as described in any one of claims 1 to 8, characterized in that, This includes control during the initial start-up phase and control during the impeller (7) operation phase, among which, The control during the initial startup phase includes: S11: After turning on the power, check whether the float (6) is lower than the first preset height; S12: If the float (6) is lower than the first preset height, the controller controls the vacuum pump (4) to start; S13: When the float (6) rises to the first preset height, the controller controls the vacuum pump (4) to shut down; The control of the impeller (7) during operation includes: S21: After the vacuum pump (4) is turned off, check whether the float (6) is lower than the second preset height; S22: If the float (6) is lower than the second preset height, the controller will start the vacuum pump (4); S23: When the float (6) rises to the first preset height, the controller controls the vacuum pump (4) to shut down.

10. The control method for a self-priming pump according to claim 9, characterized in that, In the initial stage, in steps S11 and S12, the position of the float (6) is detected by the first liquid level sensor (2), and the first preset height is the sensing area of ​​the first liquid level sensor (2). If the float (6) is lower than the first preset height, the first liquid level sensor (2) generates a first signal and transmits it to the controller. In the impeller (7) operation stage, in steps S21 and S22, the position of the float (6) is detected by the second liquid level sensor (3), and the second preset height is the sensing area of ​​the second liquid level sensor (3). If the float (6) is lower than the second preset height, the second liquid level sensor (3) generates a first signal and transmits it to the controller. In steps S13 and S23, the position of the float (6) is detected by the first liquid level sensor (2). If the float (6) rises to the first preset height, the first liquid level sensor (2) generates a second signal and transmits it to the controller.

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