Intelligent rectifying vortex-eliminating water-absorbing horn pipe for pump and self-adaptive adjusting method of intelligent rectifying vortex-eliminating water-absorbing horn pipe

Abstract

The invention discloses an intelligent rectifying vortex-eliminating water suction horn pipe for a pump and a self-adaptive adjusting method thereof.The water suction horn pipe comprises a flexible horn pipe body and a cross-shaped rectifier which are arranged in a matched mode, the narrow-opening end of the flexible horn pipe body is connected with a water suction pipe of the water pump, and the cross-shaped rectifier is installed in the wide-opening end of the flexible horn pipe body; a movable direction regulator is further mounted in the narrow-mouth end part of the flexible horn tube and is used for controlling the rotating direction of the cross rectifier; and the plurality of intelligent laser flow meters are circumferentially mounted on the inner side of the narrow-opening end part of the flexible horn tube. According to the self-adaptive adjusting method, flow velocity distribution information is collected through the intelligent laser flow meter and transmitted to the pump station control terminal, and the control terminal calculates and adjusts the diffusion angle and the inlet diameter of the horn tube in real time based on the flow velocity distribution information, adapts to the flow state of incoming water flow, eliminates vortexes in time and adjusts the flow state; the water inlet flow state in the water suction pipe reaches the optimal state, operation of a unit is guaranteed, and the operation efficiency of the water pump is improved.

Description

Technical Field

[0001] The invention relates to the technical field of hydraulic machinery, and in particular to an intelligent rectifying and vortex-eliminating water-absorbing trumpet tube for a pump and a self-adaptive adjustment method thereof. Background Art

[0002] The suction bell is a key part of the water pump. Its main function is to better divert the water flow into the water pump impeller, provide the water pump with a suitable water flow pattern, and provide good inlet conditions for the impeller chamber inlet.

[0003] In the prior art, the water suction bell is generally fixed. However, various unstable flow states will exist when the water pump is running. When the working conditions of the water pump change, the fixed water suction bell is prone to backflow and vortex, resulting in asymmetric water inlet to the impeller, flow separation inside the impeller, etc., causing the water pump pressure pulsation to increase, the vibration to intensify, and the working state of the pump device to deteriorate, affecting the efficiency of the pump device, the cavitation performance of the water pump and the safety. Summary of the invention

[0004] The problem to be solved by the present invention is to provide an intelligent rectifying and vortex-eliminating water suction bell tube for a pump and an adaptive adjustment method thereof, which can timely adjust the diffusion angle of the bell tube according to the flow state, and at the same time, through the design of a cross-type rectifier and the like, can timely eliminate vortices and adjust the flow state, so that the water inlet flow state in the suction pipe reaches the optimal state, thereby ensuring the operation of the unit.

[0005] The present invention adopts the following technical scheme: an intelligent rectifying and vortex-eliminating water-absorbing bell tube for a pump, comprising: a flexible bell tube and a cross-shaped rectifier, a movable direction adjuster, and an intelligent laser flowmeter installed inside the flexible bell tube.

[0006] The narrow end of the flexible horn tube is connected to the water pump suction pipe, and the cross-shaped rectifier is installed in the wide end of the flexible horn tube; the movable direction adjuster is installed in the narrow end of the flexible horn tube to control the rotation direction of the cross-shaped rectifier;

[0007] There are multiple intelligent laser flow meters, which are circumferentially installed on the inner side of the narrow end of the flexible trumpet tube to collect flow velocity distribution information and transmit it to the pump station control terminal through a wireless transmitter;

[0008] Based on the flow velocity distribution information, the pump station control terminal calculates and adjusts the diffusion angle and inlet diameter of the bell pipe in real time, adapts to the flow state of the incoming water in real time, and realizes rectification and vortex elimination.

[0009] Preferably, the flexible flared tube is made of a high-strength chain-belt type flexible material, and the narrow end of the flexible flared tube is connected to the water pump suction pipe through a flange.

[0010] Preferably, the cross-shaped rectifier includes two cross-arranged telescopic thrust rods, each of which is divided into an outer section and an inner section. A hydraulic pusher and a micro motor that are matched and connected are installed in the outer section. The hydraulic pusher is connected to the inner section to promote the extension and retraction of the telescopic thrust rod.

[0011] Preferably, the micro motor is an intelligent micro rechargeable motor, which is arranged at the rear end of the hydraulic pusher to provide power for the pushing of the embedded telescopic thrust rod. By controlling the extension and retraction of the embedded telescopic thrust rod, the diffusion angle and inlet diameter of the horn tube are controlled.

[0012] Preferably, the nested telescopic thrust rod is connected to the inner wall of the flexible bell tube by bolts, the vertical distance between the nested telescopic thrust rod and the wide-mouth end of the flexible bell tube is 0.01D, and the maximum length of the nested telescopic thrust rod is 0.003D, wherein D is the impeller diameter of the water pump.

[0013] Preferably, the nested retractable thrust rod rotates along the center, and the rotation angle range is 0-45°.

[0014] Preferably, there are 6 intelligent laser flow meters, which are installed on the inner side of the narrow end of the flexible bell tube at a position 10 mm away from the connection of the water pump suction pipe and are evenly distributed along the circumferential direction.

[0015] The technical solution of the present invention also provides: a method for adaptively adjusting a pump-used intelligent rectifying and vortex-eliminating water-absorbing trumpet tube, which is applied to any of the above-mentioned intelligent rectifying and vortex-eliminating water-absorbing trumpet tubes for pumps, wherein the intelligent laser flow meter is connected to the pump station control terminal through a wireless transmitter, and the pump station control terminal adaptively adjusts the diffusion angle and inlet diameter of the trumpet tube based on the flow velocity distribution information, and the method comprises the following steps:

[0016] S1. The pump station control terminal obtains the flow velocity distribution information at the inlet of the flexible bell pipe in real time;

[0017] S2. Calculate the weighted velocity uniformity of the trumpet inlet according to the velocity distribution information and the velocity uniformity calculation model;

[0018] S3, calculating the diffusion angle of the trumpet pipe according to the weighted velocity uniformity at the trumpet pipe inlet and the adjustment model of the diffusion angle and the velocity uniformity;

[0019] S4, according to the diffusion angle of the trumpet tube, control the micro motor and the hydraulic pusher to push the sleeve-type retractable thrust rod to extend and rotate, and adaptively adjust the diffusion angle and inlet diameter of the trumpet tube;

[0020] S5. Update the flow velocity distribution information in real time, repeat steps S1 to S4, realize real-time adaptive adjustment of the diffusion angle and inlet diameter of the bell pipe, and ensure that the water flow state in the suction pipe reaches the optimal state.

[0021] Preferably, the flow velocity uniformity calculation model is:

[0022]

[0023] in, It is represented by the average cross-sectional velocity; A is represented by the cross-sectional area of ​​the bell tube inlet; n is the data point; V una Characterized by the uniformity of weighted velocity at the inlet of the bell tube; ΔA i It is represented as the area of ​​the i-unit of the cross section; Characterized by the average axial velocity; v ai Characterized by the axial velocity of section i.

[0024] Preferably, the adjustment model of the diffusion angle and flow velocity uniformity is:

[0025]

[0026] in, It is characterized by the speed regulation safety factor, N is the unit speed, V una The value range is between 0 and 1. una The closer to 1, the better the flow state. Cuna It is characterized by the critical optimal uniformity, and β is characterized by the diffusion angle of the trumpet tube.

[0027] The technical solution of the present invention also provides: a water pump, comprising any of the above-mentioned intelligent rectifying and vortex-eliminating water suction bell tube for the pump, one end of the water suction pipe of the water pump is connected to the impeller and guide vane of the water pump, and the other end is connected to the narrow end of the water suction bell tube; the water suction bell tube of the water pump timely adjusts the diffusion angle of the bell tube according to the incoming flow state, eliminates vortices, and allows water to flow evenly into the bell tube from all sides, providing a suitable water flow state for the water pump.

[0028] Compared with the prior art, the present invention adopts the above technical solution and has the following technical effects:

[0029] 1. The intelligent rectifying and vortex-eliminating water suction bell tube for pumps proposed in the present invention can timely adjust the diffusion angle of the bell tube according to the flow state. At the same time, the design of the cross-shaped rectifier and the like can also timely eliminate the vortex and adjust the flow state, so that the water inlet flow state in the suction pipe reaches the optimal state, thereby ensuring the operation of the unit.

[0030] 2. The intelligent rectifying and vortex-eliminating water-absorbing bell tube for pumps and its adaptive adjustment method proposed in the present invention can ensure that water flows evenly from all sides into the bell tube when the operating conditions vary greatly, provide a suitable water flow state for the water pump, greatly improve the operating efficiency of the water pump, extend the service life of the water pump, and save production costs.

[0031] 3. The intelligent rectifier vortex elimination water absorption trumpet pipe for pumps and its adaptive adjustment method proposed by the present invention can adapt to pump station projects with large operating conditions, significantly improve the pumping capacity of the pump, improve the operating stability of the unit, reduce operating costs, and be more energy-efficient and efficient. The patent of the present invention has a simple structure, reliable technology, easy implementation, broad application prospects, and great economic benefits. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 2 is a schematic diagram of the structure of an intelligent rectifying and vortex-eliminating water-absorbing trumpet tube for a pump according to an embodiment of the present invention;

[0033] Figure 2 2 is a bottom view schematic diagram of an intelligent rectifying and vortex-eliminating water-absorbing trumpet pipe for a pump according to an embodiment of the present invention;

[0034] Figure 3 1 is a top view schematic diagram of a connection section of an intelligent rectifying and vortex-eliminating water-absorbing trumpet pipe for a pump according to an embodiment of the present invention;

[0035] Figure 4 It is a schematic diagram of the structure of a water pump part according to an embodiment of the present invention;

[0036] Figure 5 It is a schematic cross-sectional structural diagram of a cross-shaped rectifier in an intelligent rectifier and vortex-eliminating water-absorption bell tube for a pump according to an embodiment of the present invention; the markings in the figure are as follows: 102-flexible bell tube, 104-cross-shaped rectifier, 1042-nested retractable thrust rod, 1044-hydraulic pusher, 106-movable direction adjuster, 108-intelligent laser flowmeter, 110-flange, 112-impeller, 114-guide vane, 116-water suction pipe. DETAILED DESCRIPTION

[0037] In order to make the purpose, technical solution and advantages of the present invention clearer, the technical solution of the application is further elaborated in detail below in conjunction with the accompanying drawings. The described embodiments are only a part of the embodiments involved in the present invention. All non-innovative embodiments of other researchers in the field on this embodiment belong to the protection scope of the present invention. At the same time, for the step numbering in the embodiment of the present invention, it is only set for the convenience of explanation, and the order between the steps is not limited in any way. The execution order of each step in the embodiment can be adaptively adjusted according to the understanding of those skilled in the art.

[0038] Embodiment 1:

[0039] An intelligent rectifying and vortex-eliminating water-absorbing trumpet tube for a pump, such as Figure 1 As shown, it includes: a flexible trumpet tube 102 and a cross-shaped rectifier 104 that are arranged in coordination.

[0040] A cross-shaped rectifier 104 is installed inside the flexible horn tube 102; the narrow end of the flexible horn tube 102 is connected to the water pump suction pipe 116; a movable direction changer 106 is installed inside the narrow end of the flexible horn tube 102; and a plurality of intelligent laser flow meters 108 are circumferentially installed on the inner side of the narrow end of the flexible horn tube 102.

[0041] In this embodiment, by installing a cross-shaped rectifier 104 inside the flexible flared tube 102, on the one hand, the cross-shaped rectifier 104 can be used to adjust the diffusion angle of the flared tube and adapt to different incoming flow states. On the other hand, the cross-shaped rectifier 104 can also eliminate vortices and adjust the flow state in time, which is conducive to achieving the optimal water inlet flow state in the suction pipe and ensuring the operation of the unit.

[0042] Furthermore, by installing a movable direction adjuster 106 in the narrow end of the flexible horn tube 102, the diffusion adjustment of the horn tube can be realized under the drive of the cross-shaped rectifier 104. A plurality of intelligent laser flow meters 108 are installed circumferentially inside the narrow end of the flexible horn tube 102, which can transmit the flow velocity distribution information to the pump station control terminal through a wireless transmitter, which is conducive to adjusting the diffusion angle and inlet diameter of the horn tube through the flow velocity distribution information.

[0043] Preferably, the cross rectifier 104, such as Figure 2 and Figure 5 As shown, it includes: two cross-arranged telescopic thrust rods 1042, each of which is divided into two sections, and a hydraulic pusher 1044 and a micro motor that are matched and connected are installed in the outer section. The hydraulic pusher 1044 is connected to the inner section to promote the extension and retraction of the telescopic thrust rods 1042.

[0044] In this embodiment, the micro motor adopts an intelligent micro rechargeable motor, which is arranged at the rear end of the hydraulic pusher 1044, and can provide power for the push of the embedded retractable thrust rod 1042, thereby controlling the diffusion angle and inlet diameter of the horn tube by controlling the extension and retraction of the thrust rod.

[0045] Preferably, the vertical distance between the telescopic thrust rod 1042 and the wide end of the flexible bell tube 102 is 0.01D, and the maximum length of the telescopic thrust rod 1042 is 0.003D, wherein D is the impeller diameter of the water pump.

[0046] Preferably, the telescopic thrust rod 1042 rotates along the center, and the rotation angle range is 0-45°.

[0047] In this embodiment, the specific design of the embedded retractable thrust rod is further optimized, so that the diffusion angle of the thrust rod can be adjusted according to the incoming water flow state, adapting to the incoming water flow state in real time, playing a rectifying role, and at the same time, can also play a vortex elimination role.

[0048] Preferably, six of the intelligent laser flow meters 108 are installed along the circumferential direction on the inner side of the narrow end of the flexible bell tube 102 at a position 10 mm away from the connection of the water pump suction pipe.

[0049] In this embodiment, six intelligent laser flow meters 108 are evenly distributed circumferentially along the inner side of the narrow end of the flexible bell tube 102 at a distance of 10 mm from the connection with the water pump suction pipe, so that relatively accurate flow velocity distribution information can be obtained in real time.

[0050] Preferably, if Figure 3 As shown, the narrow end of the flexible bell tube 102 is connected to the water pump suction pipe 116 through the flange 110; the sleeve-type retractable thrust rod 1042 of the cross-shaped rectifier 104 is connected to the inner wall of the bell tube through bolts.

[0051] Embodiment 2:

[0052] A method for adaptively adjusting an intelligent rectifying and vortex-eliminating water-absorbing trumpet tube for a pump, using the intelligent rectifying and vortex-eliminating water-absorbing trumpet tube for a pump in any one of the technical solutions of the present invention, and an intelligent laser flow meter is connected to a pump station control terminal through a wireless transmitter, and the method comprises the following steps:

[0053] Obtain the flow velocity distribution information at the inlet of the flexible bell pipe in real time;

[0054] According to the velocity distribution information and the velocity uniformity calculation model, the weighted velocity uniformity at the inlet of the bell tube is calculated. The velocity uniformity calculation model is:

[0055]

[0056] in, It is represented by the average cross-sectional velocity; A is represented by the cross-sectional area of ​​the bell tube inlet; n is the data point; V una Characterized by the uniformity of weighted velocity at the inlet of the bell tube; ΔA i It is represented as the area of ​​the i-unit of the cross section; Characterized by the average axial velocity; v ai It is represented by the axial velocity of the section i unit,

[0057] According to the weighted velocity uniformity at the inlet of the bell tube, the diffusion angle of the bell tube is calculated according to the adjustment model of the diffusion angle and the velocity uniformity. The adjustment model of the diffusion angle and the velocity uniformity is:

[0058]

[0059] in, It is characterized by the speed regulation safety factor, N is the unit speed, N = Nr / N max , Nr represents the rated speed of the pump, N max Characterized by the maximum speed of the pump, V una The value range is between 0 and 1. una The closer to 1, the better the flow state. Cuna It is characterized by the critical optimal uniformity, with a value range of 0.92-0.95, and β is characterized by the diffusion angle of the trumpet tube.

[0060] According to the diffusion angle of the trumpet tube, the micro motor and the hydraulic pusher are controlled to push the telescopic thrust rod to extend and rotate for automatic adjustment. The micro motor provides power, and the movable direction adjuster controls the rotation direction. The rotation angle range of the telescopic thrust rod is 0-45°

[0061] In this embodiment, the flow velocity distribution information at the inlet of the flexible bell tube is obtained in real time, and the flow velocity distribution information is used to parse the average cross-sectional velocity, the cross-sectional area of ​​the bell tube inlet, the area of ​​the cross-sectional i unit, the average axial velocity, the axial velocity of the cross-sectional i unit, etc., and the flow velocity uniformity calculation model is used to calculate the flow velocity uniformity data, and the diffusion angle and flow velocity uniformity adjustment model is used to determine the diffusion angle, so that the micro motor and the hydraulic pusher can be controlled according to the diffusion angle of the bell tube to push the embedded retractable thrust rod to retract and rotate, and automatically adjust, so as to realize the adaptive and timely adjustment of the diffusion angle of the bell tube, and ensure that the water inlet flow state in the suction pipe reaches the optimal state.

[0062] It should be noted that after the retractable thrust rod is extended and rotated to automatically adjust the horn tube, the diffusion angle and inlet diameter of the horn tube will be changed, the flow velocity distribution information will also change accordingly, and then there will be new real-time flow velocity distribution information. This cycle will continue to perform adaptive adjustments to maintain the water inlet flow state in the suction pipe in the optimal state, thereby ensuring the operating stability of the unit.

[0063] Embodiment three:

[0064] This embodiment provides a water pump, such as Figure 4 As shown, it includes the intelligent rectifying and vortex-eliminating water suction bell pipe for the pump of the present invention, one end of the water pump suction pipe 116 is connected to the impeller 112 and the guide vane 114 of the water pump, and the other end is connected to the narrow end portion of the water suction bell pipe.

[0065] In this embodiment, the water suction bell tube of the water pump can timely adjust the diffusion angle of the bell tube according to the incoming flow state, and can also eliminate vortices in time, so that the water flow enters the bell tube evenly from all sides, which can provide the water pump with a suitable water flow state, the impeller water inlet symmetry is good, and internal flow separation and other phenomena are not prone to occur. The efficiency, cavitation performance and safety of the water pump are relatively high, and it can adapt to pump station projects with large variations in operating conditions, save operating costs, and be more energy-efficient and efficient.

[0066] Preferably, the water pump in this embodiment is an axial flow pump or a mixed flow pump.

[0067] In summary, the intelligent rectifying and vortex-eliminating water-intake bell tube for pumps and its adaptive adjustment method proposed in the present invention can timely adjust the diffusion angle of the bell tube according to the flow state. At the same time, the design of the cross-shaped rectifier, etc. can also timely eliminate vortices and adjust the flow state, so that the water inlet flow state in the water suction pipe reaches the optimal state, ensuring the operation of the unit, and can still ensure that the water flows evenly from all sides into the bell tube when the operating conditions vary greatly, providing a suitable water flow state for the water pump, improving the operating efficiency of the water pump, extending the service life of the water pump, and saving production costs.

[0068] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principle of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. An intelligent rectifying and vortex-eliminating water-absorbing trumpet tube for a pump, characterized in that: include: Flexible trumpet tube and cross-shaped rectifier, movable direction adjuster and intelligent laser flow meter installed inside the flexible trumpet tube; The narrow end of the flexible horn tube is connected to the water pump suction pipe, and the cross-shaped rectifier is installed in the wide end of the flexible horn tube; the movable direction adjuster is installed in the narrow end of the flexible horn tube to control the rotation direction of the cross-shaped rectifier; There are multiple intelligent laser flow meters, which are circumferentially installed on the inner side of the narrow end of the flexible bell tube to collect flow velocity distribution information and transmit it to the pump station control terminal through a wireless transmitter; The pump station control terminal calculates and adjusts the diffusion angle and inlet diameter of the bell pipe in real time based on the flow velocity distribution information to adapt to the flow state of the incoming water flow and achieve rectification and vortex elimination.

2. The intelligent rectifying and vortex-eliminating water-absorbing trumpet tube for pumps according to claim 1 is characterized in that: The flexible horn tube is made of a high-strength chain-belt type flexible material, and the narrow end of the flexible horn tube is connected to the water pump suction pipe through a flange.

3. The intelligent rectifying and vortex-eliminating water-absorbing trumpet tube for pumps according to claim 1 is characterized in that: The cross-shaped rectifier includes two cross-arranged telescopic thrust rods, each of which is divided into an outer section and an inner section. A hydraulic pusher and a micro motor that are matched and connected are installed in the outer section. The hydraulic pusher is connected to the inner section to promote the extension and retraction of the telescopic thrust rod.

4. The intelligent rectifying and vortex-eliminating water-absorbing trumpet tube for pumps according to claim 3 is characterized in that: The micro motor is an intelligent micro rechargeable motor, which is arranged at the rear end of the oil hydraulic pusher to provide power for the pushing of the embedded telescopic thrust rod. The diffusion angle and inlet diameter of the horn tube are controlled by controlling the extension and retraction of the embedded telescopic thrust rod.

5. The intelligent rectifying and vortex-eliminating water-absorbing trumpet tube for pumps according to claim 4 is characterized in that: The nested telescopic thrust rod is connected to the inner wall of the flexible bell tube by bolts, the vertical distance between the nested telescopic thrust rod and the wide-mouth end of the flexible bell tube is 0.01D, and the maximum length of the nested telescopic thrust rod is 0.003D, wherein D is the impeller diameter of the water pump.

6. The intelligent rectifying and vortex-eliminating water-absorbing trumpet tube for pumps according to claim 4 is characterized in that: The sleeve-type retractable thrust rod rotates along the center, and the rotation angle range is 0-45 degrees.

7. The intelligent rectifying and vortex-eliminating water-absorbing trumpet tube for pumps according to claim 1 is characterized in that: There are six intelligent laser flow meters installed on the inner side of the narrow end of the flexible trumpet tube at a distance of 10 mm from the connection of the water pump suction pipe and evenly distributed along the circumferential direction.

8. An adaptive adjustment method for an intelligent rectifying and vortex-eliminating water-absorbing trumpet tube for a pump, applied to the intelligent rectifying and vortex-eliminating water-absorbing trumpet tube for a pump as claimed in any one of claims 1 to 7, characterized in that: The intelligent laser flow meter is connected to the pump station control terminal through a wireless transmitter. The pump station control terminal adaptively adjusts the diffusion angle and inlet diameter of the trumpet tube based on the flow velocity distribution information. The method includes the following steps: S1. Intelligent laser flowmeter obtains the flow velocity distribution information at the inlet of the flexible trumpet pipe in real time and sends it to the pump station control terminal; S2, the pump station control terminal calculates the weighted flow velocity uniformity of the trumpet inlet according to the flow velocity distribution information and the flow velocity uniformity calculation model; S3, calculating the diffusion angle of the trumpet pipe according to the weighted velocity uniformity at the trumpet pipe inlet and the adjustment model of the diffusion angle and the velocity uniformity; S4, according to the diffusion angle of the trumpet tube, control the micro motor and the hydraulic pusher to push the sleeve-type retractable thrust rod to extend and rotate, and adaptively adjust the diffusion angle and inlet diameter of the trumpet tube; S5. Update the flow velocity distribution information in real time, repeat steps S1 to S4, realize real-time adaptive adjustment of the diffusion angle and inlet diameter of the bell pipe, and ensure that the water flow state in the suction pipe reaches the optimal state.

9. The adaptive adjustment method of the intelligent rectifying and vortex-eliminating water-absorbing trumpet pipe for pumps according to claim 8 is characterized in that: The flow velocity uniformity calculation model is: in, It is represented by the average cross-sectional velocity; A is represented by the cross-sectional area of ​​the bell tube inlet; n is the data point; V uma Characterized by the uniformity of weighted velocity at the inlet of the bell tube; ΔA i It is represented as the area of ​​the i-unit of the cross section; Characterized by the average axial velocity; v ai It is represented by the axial velocity of the section i unit; The adjustment model of the diffusion angle and flow velocity uniformity is: in, It is characterized by the speed regulation safety factor, N is the unit speed, V una The value range is between 0 and 1. una The closer to 1, the better the flow state. Cuna It is characterized by the critical optimal uniformity, and β is characterized by the diffusion angle of the trumpet tube.

10. A water pump, comprising the intelligent rectifying and vortex-eliminating water-absorbing trumpet tube for a pump according to any one of claims 1 to 7, characterized in that: One end of the water pump's suction pipe is connected to the water pump's impeller and guide vane, and the other end is connected to the narrow end of the water suction bell pipe; the water pump's suction bell pipe timely adjusts the diffusion angle of the bell pipe according to the incoming flow state, eliminates vortices, and allows water to flow evenly into the bell pipe from all sides, providing the water pump with a suitable water flow state.

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