Downdraft centrifugal pump

Abstract

The utility model discloses a centrifugal pump which can pump out water in a water tank as much as possible and avoid water accumulation in the water tank. The downdraft centrifugal pump comprises a motor, a pump seat, a driving shaft, a driving impeller and a volute, the motor is mounted on the pump seat, a liquid outlet flow channel is arranged in the pump seat, the driving shaft is rotatably mounted on the pump seat and connected to the output end of the motor, the motor drives the driving shaft to rotate, the driving impeller is mounted on the driving shaft, and the volute is mounted at the bottom of the pump seat. A liquid pressing cavity is formed in the volute and communicated with the liquid outlet flow channel, the driving impeller is arranged in the liquid pressing cavity, and a liquid inlet communicated with the liquid pressing cavity penetrates through the bottom of the volute.

Description

Technical Field

[0001] This utility model relates to the field of centrifugal pumps, and more particularly to a bottom-suction centrifugal pump. Background Technology

[0002] A centrifugal pump is a pump that uses the centrifugal force generated by the rotation of an impeller to transport liquids. The pump shaft drives the impeller to rotate at high speed, causing the water to undergo centrifugal motion. The water is thrown towards the outer edge of the impeller and flows into the pump's discharge pipe through the volute casing. Existing centrifugal pumps often have relatively high inlets. When the water level in the tank is lower than the inlet, the centrifugal pump cannot pump out the remaining water, leading to water accumulation in the tank. Therefore, there is an urgent need for a bottom-suction centrifugal pump that can pump out as much water as possible from the tank to avoid water accumulation and overcome this defect. Utility Model Content

[0003] The purpose of this invention is to provide a bottom-suction centrifugal pump that can extract as much water as possible from a water tank to prevent water accumulation.

[0004] To achieve the above objectives, this utility model provides a bottom-suction centrifugal pump, which includes a motor, a pump base, a drive shaft, a drive impeller, and a volute. The motor is mounted on the pump base, which has a liquid outlet channel. The drive shaft is rotatably mounted on the pump base and connected to the output end of the motor. The motor drives the drive shaft to rotate. The drive impeller is mounted on the drive shaft. The volute is mounted on the bottom of the pump base and has a pressure chamber inside the volute, which communicates with the liquid outlet channel. The drive impeller is located in the pressure chamber, and the bottom of the volute has a liquid inlet communicating with the pressure chamber.

[0005] Preferably, the drive shaft passes through the pump base.

[0006] Preferably, the pump base includes an upper body, a lower body, a conduit, and a connector whose two ends are respectively connected to the upper body and the lower body. The lower body is located below the upper body, the motor is mounted on the top of the upper body, the volute is mounted on the bottom of the lower body, the lower end of the conduit is connected to the lower body, the upper end of the conduit extends towards the upper body, the liquid outlet channel is located inside the conduit, and the drive shaft passes through the upper body and the lower body respectively.

[0007] Preferably, the pump base also includes a receiving seat, which is located between the upper and lower seats. The connecting body is also connected to the receiving seat, and the drive shaft also passes through the receiving seat. An accommodating space is formed between the upper and lower seats, and the upper end of the conduit is bent and located in the accommodating space.

[0008] Preferably, the upper end of the conduit is also connected to the upper seat and the receiving seat respectively, and the liquid outlet channel opens radially outward at the upper end of the conduit.

[0009] Preferably, the pump base also includes a support rib, which is disposed between the receiving body and the lower body. One end of the support rib is connected to the connecting body, and the other end of the support rib is connected to the conduit.

[0010] Preferably, a support protrusion extends upward from the middle part of the lower body to form a support protrusion. The support protrusion has a vertically penetrating installation channel. A guide sleeve is installed in the installation channel. The drive shaft passes through the guide sleeve and is fitted onto the guide sleeve. The guide sleeve is sealed in the installation channel.

[0011] Preferably, at least one sealing ring is fitted on the outer side of the guide sleeve, and the sealing ring is located between the guide sleeve and the inner wall of the installation channel.

[0012] Preferably, the volute is fixed to the bottom of the lower body by screws.

[0013] Preferably, the upper seat, lower seat, and supporting seat are plate-shaped components, and the connecting body is arranged in a long strip shape.

[0014] Compared with existing technologies, the down-suction centrifugal pump provided by this utility model includes a motor, a pump base, a drive shaft, a drive impeller, and a volute. The motor is mounted on the pump base, which has a liquid outlet channel. The drive shaft is rotatably mounted on the pump base and connected to the output end of the motor, which drives the drive shaft to rotate. The drive impeller is mounted on the drive shaft. The volute is mounted on the bottom of the pump base and has a pressure chamber that communicates with the liquid outlet channel. The drive impeller is located in the pressure chamber. An inlet port communicating with the pressure chamber is penetrating through the bottom of the volute. By mounting the volute on the bottom of the pump base, with the inlet port located at the bottom of the volute, the inlet port is at the lowest position of the equipment, closer to the bottom of the water tank. This allows for the extraction of as much remaining water as possible from the tank, preventing water accumulation. Attached Figure Description

[0015] Figure 1 This is a front view of the bottom-suction centrifugal pump of this utility model.

[0016] Figure 2 This is a perspective view of the bottom-suction centrifugal pump of this utility model.

[0017] Figure 3 This is a perspective view of the bottom-suction centrifugal pump of this utility model when it is at another angle.

[0018] Figure 4 This is a perspective view of the bottom-suction centrifugal pump of this utility model after it has separated from the volute casing.

[0019] Figure 5 yes Figure 4 The diagram shown is a three-dimensional view of the down-suction centrifugal pump after further separation of the drive impeller, guide shaft, and sealing ring.

[0020] Figure 6 This is a bottom view of the bottom-suction centrifugal pump of this utility model.

[0021] Figure 7 This utility model relates to a bottom-suction centrifugal pump. Figure 6 The sectional view obtained after cutting along line segment AA. Detailed Implementation

[0022] To explain the technical content and structural features of this utility model in detail, the following description is provided in conjunction with the embodiments and accompanying drawings.

[0023] like Figures 1 to 7 As shown, this utility model provides a bottom-suction centrifugal pump 100, including a motor 10, a pump base 20, a drive shaft 30, a drive impeller 40, and a volute 50. The motor 10 is mounted on the pump base 20, which has a liquid outlet channel 21. The drive shaft 30 is rotatably mounted on the pump base 20 and is connected to the output end of the motor 10. The motor 10 drives the drive shaft 30 to rotate. The drive impeller 40 is mounted on the drive shaft 30. The volute 50 is mounted on the bottom of the pump base 20 and has a pressure chamber 51 inside. The bottom of the volute 50 has a liquid inlet 52 communicating with the pressure chamber 51. Motor 10 drives drive shaft 30 to rotate, and liquid is drawn into pressure chamber 51 from inlet 52, driving drive impeller 40 to move at high speed in pressure chamber 51. This forces the liquid between the blades to rotate at approximately constant angular velocity. Due to centrifugal force, the liquid moves radially from the center of drive impeller 40 to the outer edge. The liquid gains energy during its movement in the impeller and moves radially away from the outer edge of drive impeller 40 at high speed. The liquid gains energy during its movement in the impeller and moves radially away from the center of drive impeller 40 to the outer edge. In volute 50, the liquid decelerates due to the gradual expansion of the flow channel, converting some of its kinetic energy into potential energy, and then flows to outlet flow channel 21 and finally out.

[0024] In this invention, the volute 50 is installed at the bottom of the pump base 20, and the inlet 52 is located below the pump base 20. The inlet 52 is positioned at the bottom of the volute 50, placing it at the lowest point of the device. This inlet 52 is closer to the bottom of the water tank, allowing for the extraction of as much remaining water as possible and preventing water accumulation in the tank. Preferably, the drive shaft 30 passes through the pump base 20.

[0025] like Figures 1 to 7As shown, the pump base 20 includes an upper base 22, a lower base 23, a conduit 24, and a connecting body 25 connected to the upper base 22 and the lower base 23 at both ends. The lower base 23 is located below the upper base 22, the motor 10 is mounted on the top of the upper base 22, the volute 50 is mounted on the bottom of the lower base 23, the lower end of the conduit 24 is connected to the lower base 23, the upper end of the conduit 24 extends towards the upper base 22, the liquid outlet channel 21 is located inside the conduit 24, and the drive shaft 30 passes through both the upper base 22 and the lower base 23. The connecting body 25 connects the upper base 22 and the lower base 23 and supports them, and the conduit 24 is provided to house the liquid outlet channel 21.

[0026] Furthermore, the pump base 20 also includes a receiving seat 26, which is located between the upper base 22 and the lower base 23. The connecting body 25 is also connected to the receiving seat 26, and the drive shaft 30 also passes through the receiving seat 26. A receiving space 27 is formed between the upper base 22 and the receiving seat 26, and the upper end of the conduit 24 is bent and located in the receiving space 27. The receiving seat 26 helps to improve the structural stability of the pump base 20, and the upper end of the conduit 24 is located in the receiving space 27, which facilitates the positioning of the upper end of the conduit 24. Preferably, the upper end of the conduit 24 is also connected to the upper base 22 and the receiving seat 26 respectively, specifically, by integral injection molding or melt connection. The liquid outlet channel 21 opens radially outward at the upper end of the conduit 24 to lead out the pumped liquid.

[0027] like Figures 1 to 7 As shown, the pump base 20 also includes a support rib 28, which is disposed between the receiving body 26 and the lower body 23. One end of the support rib 28 is connected to the connecting body 25, and the other end of the support rib 28 is connected to the conduit 24. The support rib 28 is provided to strengthen the connection between the connecting body 25 and the conduit 24, thereby improving the structural stability of the pump base 20.

[0028] like Figures 1 to 7As shown, a support protrusion 231 protrudes upward from the middle of the lower seat 23. The support protrusion 231 has a through-hole mounting channel 232. A guide sleeve 29 is installed in the mounting channel 232. The drive shaft 30 passes through the guide sleeve 29 and is fitted onto it. The guide sleeve 29 is sealed within the mounting channel 232. The guide sleeve 29 guides the drive shaft 30, preventing excessive oscillation during high-speed rotation, thus avoiding noise and extending the equipment's lifespan. Preferably, at least one sealing ring 291 is fitted on the outer side of the guide sleeve 29. The sealing ring 291 is located between the guide sleeve 29 and the inner wall of the mounting channel 232, sealing the guide sleeve 29 within the mounting channel 232 and preventing leakage of liquid from the hydraulic chamber 51. Preferably, two sealing rings 291 are provided, one above the other, but the number is not limited to this.

[0029] like Figures 1 to 7 As shown, the volute 50 is fixed to the bottom of the lower seat 23 with screws, facilitating the assembly and disassembly of the volute 50. The upper seat 22, lower seat 23, and receiving seat 26 are plate-shaped components, and the connecting body 25 is arranged in a long strip shape. At this time, the liquid can flow freely through the pump seat 20, reducing the obstruction to the liquid flow. An electronic control module 11 is also installed on the side wall of the motor 10. The electronic control module 11 is used to control the operating conditions of the motor 10.

[0030] like Figure 7 As shown, in order to facilitate heat dissipation of the motor 10 and avoid overheating of the motor 10, a heat dissipation impeller 60 is installed on the drive shaft 30. The heat dissipation impeller 60 is located above the motor 10 and aligned with the motor 10. The drive shaft 30 drives the heat dissipation impeller 60 to rotate and dissipate heat from the electrodes.

[0031] Preferably, the liquids transported by the down-suction centrifugal pump of this invention include, but are not limited to, water, oil, acid and alkali solutions, emulsions, suspensions, etc.

[0032] The following is a brief description of the working process of the down-suction centrifugal pump 100 of this utility model: The motor 10 drives the drive shaft 30 to rotate, which in turn drives the drive impeller 40 to rotate. The drive impeller 40 rotates at high speed in the pressure chamber 51 of the volute 50, causing the liquid in the water tank to be sucked into the pressure chamber 51 through the inlet 52. This forces the liquid between the blades to rotate at an approximately constant angular velocity. Due to the centrifugal force, the liquid enters the volute 50 from the center of the drive impeller 40 to the outer edge. Inside the volute 50, the liquid decelerates due to the gradual expansion of the flow channel, and then flows into the outlet flow channel 21 in the guide tube 24 and finally flows out.

[0033] The above-disclosed examples are merely preferred embodiments of the present utility model and should not be construed as limiting the scope of the present utility model. Therefore, any equivalent variations made in accordance with the claims of the present utility model shall fall within the scope of the present utility model.

Claims

1. A bottom-suction centrifugal pump, characterized in that: The pump includes a motor, a pump base, a drive shaft, a drive impeller, and a volute. The motor is mounted on the pump base, which has a liquid outlet channel. The drive shaft is rotatably mounted on the pump base and connected to the output end of the motor. The motor drives the drive shaft to rotate. The drive impeller is mounted on the drive shaft. The volute is mounted on the bottom of the pump base and has a pressure chamber inside, which communicates with the liquid outlet channel. The drive impeller is located in the pressure chamber. The bottom of the volute has a liquid inlet communicating with the pressure chamber.

2. The down-suction centrifugal pump according to claim 1, characterized in that, The drive shaft passes through the pump base.

3. The down-suction centrifugal pump according to claim 1, characterized in that, The pump base includes an upper body, a lower body, a conduit, and a connector whose two ends are respectively connected to the upper body and the lower body. The lower body is located below the upper body. The motor is mounted on the top of the upper body. The volute is mounted on the bottom of the lower body. The lower end of the conduit is connected to the lower body. The upper end of the conduit extends towards the upper body. The liquid outlet channel is located inside the conduit. The drive shaft passes through the upper body and the lower body respectively.

4. The down-suction centrifugal pump according to claim 3, characterized in that, The pump base also includes a receiving seat, which is located between the upper seat and the lower seat. The connecting body is also connected to the receiving seat, and the drive shaft also passes through the receiving seat. An accommodating space is formed between the upper seat and the receiving seat, and the upper end of the conduit is bent and located in the accommodating space.

5. The down-suction centrifugal pump according to claim 4, characterized in that, The upper end of the conduit is also connected to the upper seat and the receiving seat respectively, and the liquid outlet channel opens radially outward at the upper end of the conduit.

6. The down-suction centrifugal pump according to claim 4, characterized in that, The pump base also includes a support rib, which is disposed between the receiving body and the lower body. One end of the support rib is connected to the connecting body, and the other end of the support rib is connected to the conduit.

7. The down-suction centrifugal pump according to claim 3, characterized in that, A support protrusion extends upward from the middle part of the lower seat, and the support protrusion has a through-hole mounting channel. A guide sleeve is installed in the mounting channel, and the drive shaft passes through the guide sleeve and is fitted onto the guide sleeve. The guide sleeve is sealed in the mounting channel.

8. The down-suction centrifugal pump according to claim 7, characterized in that, At least one sealing ring is fitted on the outer side of the guide sleeve, and the sealing ring is located between the guide sleeve and the inner wall of the mounting channel.

9. The down-suction centrifugal pump according to claim 3, characterized in that, The volute is fixed to the bottom of the lower body by screws.

10. The down-suction centrifugal pump according to claim 4, characterized in that, The upper seat, the lower seat, and the receiving seat are plate-shaped components, and the connecting body is arranged in a long strip shape.

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