Anti-vortex multi-stage pump

Abstract

The invention relates to an anti-vortex multi-stage pump which comprises a base, an outer cylinder, a support and a motor which are sequentially connected from bottom to top, a multi-stage impeller driven by the motor is arranged in the outer cylinder, an anti-vortex device is arranged at an impeller inlet of the outer cylinder, and the anti-vortex device comprises an anti-vortex plate arranged at the impeller inlet. A non-return device is arranged at an inlet of the water pump, and a pressure and temperature sensor is arranged on the support. According to the anti-vortex multi-stage pump, the anti-vortex device is additionally arranged on the pump, the anti-vortex plate is arranged near the impeller inlet of the base, and vortex is prevented from being generated when the liquid level enters the impeller inlet. Besides, the pressure and temperature sensor is arranged on the support, a non-return device is arranged at an inlet of the water pump, liquid backflow of the system is prevented, pressure and temperature values of the system can be accurately metered, linkage with a motor can be achieved, misoperation is avoided, and the effect of moving by difference can be achieved.

Description

Technical Field

[0001] The invention belongs to the technical field of water pumps, and in particular relates to an anti-vortex multi-stage pump. Background Art

[0002] Multistage centrifugal pumps are used in the transportation of industrial liquids and urban water supply and drainage, high-rise building pressurized water supply, garden sprinkler irrigation, fire boosting, long-distance water delivery, heating, bathroom and other hot and cold water circulation boosting and equipment matching, as well as air-conditioning unit circulation, cooling water transportation, etc., and the output flow can be adjusted by different pressures or temperatures.

[0003] In the prior art, the blades used in the centrifugal pump impeller have a working surface and a non-working surface. However, the working surface and the non-working surface of the blades are both neat and flat, which easily generates vortices in the impeller flow channel. The vortices collide with the water flow, reducing the working efficiency of the centrifugal pump. At the same time, when the water flow collides with the vortex and the water flow hits the blade surface, large noise and vibration are generated.

[0004] In addition, conventional water pumps mostly use pressure sensors or temperature sensors to control the constant or variable operation of the unit. It is usually necessary to install a check valve at the outlet of the water pump, and the sensor is set on the system pipeline. In most applications of multi-stage centrifugal pumps, valves and sensors are often set independently, resulting in large water pumps and many failure points. There are also integrated arrangements of sensors set on the water pump unit on the market. After the water pump stops running, due to the check valve at the outlet, the integrated sensor cannot accurately measure the pressure or temperature of the system, causing the water pump control to malfunction. Summary of the invention

[0005] The technical problem to be solved by the present invention is to provide an anti-vortex multi-stage pump, which can accurately measure the system pressure and temperature while preventing the generation of inlet vortex, thereby improving the efficiency of the unit.

[0006] The technical solution adopted by the present invention to solve its technical problems is: to provide an anti-vortex multi-stage pump, including a base, an outer cylinder, a bracket and a motor connected in sequence from bottom to top, a pump shaft driven by the motor is arranged in the outer cylinder, a multi-stage impeller is arranged on the outer periphery of the pump shaft, a guide vane is arranged on the outer periphery of the impeller, a water pump inlet is arranged on one side of the base, a water pump outlet is arranged on the opposite side of the water pump inlet, an impeller inlet communicating with the outer cylinder is arranged on the top of the base, an anti-vortex device is arranged at the impeller inlet, the anti-vortex device includes an anti-vortex plate arranged at the impeller inlet, a check device is arranged at the water pump inlet, a pressure and temperature sensor is arranged on the bracket, and the pressure and temperature sensor is connected to the motor through an external controller.

[0007] Preferably, a guide bearing coaxial with the pump shaft of the motor is provided at the bottom of the base, a support frame is fixed to the bottom of the guide vane of the lowest layer, a sealing gasket is provided on the upper surface of the support frame, the anti-vortex device comprises an inverted umbrella-shaped plate whose shape matches the support frame, an anti-vortex central axis whose bottom can be inserted into the guide bearing is provided at the center of the inverted umbrella-shaped plate, the anti-vortex central axis can slide in the guide bearing along the height direction, the anti-vortex plates are evenly arranged on the upper surface of the inverted umbrella-shaped plate, and the lower surface of the inverted umbrella-shaped plate is in contact with the sealing gasket due to gravity.

[0008] Preferably, a plurality of anti-vortex holes are evenly opened on the inverted umbrella-shaped plate.

[0009] Preferably, the guide bearing is press-fitted onto the base via a bearing gland with a sealing ring.

[0010] Preferably, the anti-vortex plate is a thin plate arranged in a "cross" shape, and the center of the "cross" of the thin plate is coaxial with the pump shaft of the motor.

[0011] Preferably, the multi-stage impellers are arranged in series with each other.

[0012] The beneficial effect is that the present invention provides an anti-vortex multi-stage pump, an anti-vortex device is added to the pump, and an anti-vortex plate is provided near the impeller inlet of the base to prevent the generation of vortex when the liquid level enters the impeller inlet, thereby improving the operation efficiency of the water pump and saving the system's footprint and reducing on-site construction procedures. At the same time, the present invention sets a check device at the water pump inlet, so that a pressure and temperature sensor can be provided on the bracket, and there is no need to add a pressure sensor or a temperature sensor to the system pipeline. It can not only prevent the system liquid from flowing back, but also accurately measure the pressure and temperature values ​​of the system, and can also be linked with the motor to avoid malfunction, and can achieve the effect of the difference in movement. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 The present invention is a cross-sectional view of an embodiment of an anti-vortex multi-stage pump.

[0014] Figure 2 for Figure 1 Top view of the anti-eddy current device.

[0015] Figure 3 This is a cross-sectional view of a second embodiment of an anti-vortex multi-stage pump.

[0016] Figure 4 for Figure 3 Top view of the anti-eddy current device.

[0017] Among them, 101-water pump inlet; 102-water pump outlet; 1-base; 2-outer cylinder; 3-impeller; 4-guide vane; 5-pump shaft; 6-pressure and temperature sensor; 7-bracket; 8-coupling; 9-motor; 10-anti-vortex center shaft; 11-guide bearing; 12-bearing pressure cover; 13-valve disc; 14-cap nut; 15-anti-vortex device; 16-sealing gasket; 17-support frame; 111-anti-vortex plate; 151-anti-vortex hole; 18-check device; 19-bolt.

[0018] The same reference numerals in the various drawings represent the same components. DETAILED DESCRIPTION

[0019] The present invention will be further described below in conjunction with specific embodiments. It should be understood that these embodiments are only used to illustrate the present invention and are not intended to limit the scope of the present invention. In addition, it should be understood that after reading the content taught by the present invention, those skilled in the art can make various changes or modifications to the present invention, and these equivalent forms fall within the scope limited by the appended claims of the application equally.

[0020] The present invention provides an anti-vortex multi-stage pump, comprising a base 1, an outer cylinder 2, a bracket 7 and a motor 9 connected in sequence from bottom to top, a pump shaft 5 driven by the motor 9 is arranged in the outer cylinder 2, a multi-stage impeller 3 is arranged on the outer periphery of the pump shaft 5, a guide vane 4 is arranged on the outer periphery of the impeller 3, a water pump inlet 101 is arranged on one side of the base 1, a water pump outlet 102 is arranged on the opposite side of the water pump inlet 101, and an impeller 3 inlet communicating with the outer cylinder 2 is arranged on the top of the base 1. The multi-stage pump of the present invention is a prior art, the base 1 is arranged horizontally, the medium to be transported enters from the water pump inlet 101 through the impeller 3 inlet and enters the impeller 3 area, and after being pressurized by the impeller 3, it flows from the water pump outlet 102 to the system pipeline. The multi-stage impellers 3 and guide vanes 4 are arranged in series with each other.

[0021] An anti-vortex device 15 is provided at the inlet of the impeller 3, and the anti-vortex device 15 includes an anti-vortex plate 111 provided at the inlet of the impeller 3. A check device 18 is provided at the water pump inlet 101. A pressure and temperature sensor 6 is provided on the bracket 7, and the pressure and temperature sensor 6 is connected to the motor 9 through an external controller.

[0022] like Figure 1 , 2In the illustrated embodiment 1, a guide bearing 11 coaxial with the pump shaft 5 of the motor 9 is provided at the bottom of the base 1, a support frame 17 is fixed to the bottom of the guide vane 4 at the lowest layer, a sealing gasket 16 is provided on the upper surface of the support frame 17, and the anti-vortex device 15 comprises an inverted umbrella-shaped plate whose shape matches the support frame 17, an anti-vortex central shaft 10 whose bottom can be inserted into the guide bearing 11 is provided at the center of the inverted umbrella-shaped plate, the bottom end of the anti-vortex central shaft 10 passes through the support frame 17 and the valve disc 13 and is inserted into the guide bearing 11, and the anti-vortex central shaft 10 can slide in the guide bearing 11 along the height direction.

[0023] The anti-eddy current plates 111 are evenly arranged on the upper surface of the inverted umbrella-shaped plate, and due to gravity, the lower surface of the inverted umbrella-shaped plate is in contact with the sealing gasket 16. The guide bearing 11 is press-fitted onto the base 1 through a bearing gland 12 with a sealing ring. The anti-eddy current central shaft 10 is fixedly connected to the inverted umbrella-shaped plate through a cap nut 14.

[0024] The inverted umbrella-shaped plate is evenly provided with a plurality of anti-vortex holes 151, and the anti-vortex plate 111 is a thin plate arranged in a "cross" shape, and the center of the "cross" of the thin plate is coaxial with the pump shaft 5 of the motor 9. The anti-vortex plate 111 can generate a turbulent effect on the medium entering the inlet of the impeller 3 to prevent the generation of vortex.

[0025] The guide bearing 11 is processed with a spiral groove and is made of copper alloy material, which helps the anti-eddy current central shaft 10 to rise and fall inside it.

[0026] When the first embodiment is in use, when the pump conveying medium enters the base 1 from the water pump inlet 101, the anti-vortex device shaft 10 can slide in the guide bearing 11, so that the anti-vortex device 15 will be lifted up by the medium, and then the medium enters the support frame 17 through the anti-vortex plate hole 151, and the generated pre-swirl enters the impeller 3 after being rectified by the anti-vortex plate 111. The motor 9 is energized to drive the impeller 3 to rotate, and the pressurized medium is turned into the lower-stage impeller 3 through the guide vane 4 and continues to be pressurized. According to the working conditions, the number of impellers 3 and guide vanes 4 can be freely combined. The impellers 3 of each stage are arranged in series and pressurized. After reaching the top, they flow into the outlet of the base 1 through the outer cylinder 2 and flow to the system pipeline through the water pump outlet 102. The pressure and medium temperature at the bracket 7 are equivalent to those at the outlet of the base 1, and are measured by the pressure and temperature sensor 7. The value is connected to the controller of the motor 9 as a signal to control the speed of the motor 9 in a linked manner. When the system pressure or temperature is reached, the motor 9 stops working and the system enters a dormant state. The anti-eddy current device 15 drives the anti-eddy current device shaft 10 to slide in the guide bearing 11 under the action of gravity and upper medium pressure. The anti-eddy current device 15 contacts the sealing gasket 16 on the support frame 17 to form a seal, isolating the upper and lower pressures to achieve a check function. The pressure and temperature sensor 6 on the bracket 7 measures the system pressure or temperature in real time. When the conditions for starting the motor 9 are met, the motor enters the working state again. The entire device can be operated independently without the need for external access to other sensors, which improves the operating efficiency and control efficiency of the equipment. It can also save system space and reduce on-site construction procedures.

[0027] like Figure 3 , 4 In the second embodiment shown, a check device 18 is provided at the inlet of the base 1, and the check device 18 is connected to the base 1 by bolts 19, and the water pump outlet 102 is connected to the system pipeline. The check device 18 is embedded in the inlet of the base 1, and the check device 18 adopts a low-resistance swing structure. The check device 18 is made of stainless steel.

[0028] The base 1 is provided with a fixed anti-vortex plate 111 at the impeller inlet. The anti-vortex plate 111 is a thin plate arranged in a "cross" shape, and the center of the "cross" of the thin plate is coaxial with the pump shaft 5 of the motor 9.

[0029] When the second embodiment is in use, when the pump conveying medium pushes the non-return device 18 from the water pump inlet 101 to enter the water inlet of the base 1, and enters the impeller 3 after passing through the anti-vortex plate 111, the motor 9 is energized to drive the impeller 3 to rotate, and the pressurized medium is turned into the lower-stage impeller 3 through the guide vane 4 and continues to be pressurized. According to the working condition requirements, the number of impellers 3 and guide vanes 4 can be freely combined, and each stage of impellers 3 is arranged in series and pressurized. After reaching the top, it flows into the outlet of the base 1 through the outer cylinder 2, and flows to the system pipeline through the water pump outlet 102. Since the pressure and medium temperature at the bracket 7 are equivalent to those at the outlet of the base 1, the pressure and temperature sensor 6 on the bracket 7 measures the system pressure or temperature in real time, and its value is connected to the controller of the motor 9 as a signal to control the speed of the motor 9 in a linkage manner. When the preset pressure or temperature of the system is reached, the motor 9 stops working, the system enters a dormant state, and the non-return device 18 at the inlet of the base 1 is closed; when the conditions for starting the motor 9 are met, the motor enters the working state again. The entire device can operate independently without the need for external connection to other sensors, which improves the operating efficiency and control efficiency of the equipment. It also saves system space and reduces on-site construction procedures.

Claims

1. An anti-vortex multi-stage pump, comprising a base, an outer cylinder, a bracket and a motor connected in sequence from bottom to top, a pump shaft driven by the motor is arranged in the outer cylinder, a multi-stage impeller is arranged on the outer periphery of the pump shaft, a guide vane is arranged on the outer periphery of the impeller, a water pump inlet is arranged on one side of the base, a water pump outlet is arranged on the opposite side of the water pump inlet, an impeller inlet communicated with the outer cylinder is arranged on the top of the base, characterized in that: An anti-vortex device is provided at the impeller inlet, and the anti-vortex device includes an anti-vortex plate provided at the impeller inlet. A check device is provided at the water pump inlet. A pressure and temperature sensor is provided on the bracket, and the pressure and temperature sensor is connected to the motor through an external controller.

2. The anti-vortex multistage pump according to claim 1, characterized in that: A guide bearing coaxial with the pump shaft of the motor is provided at the bottom of the base, a support frame is fixed to the bottom of the guide vane of the lowest layer, a sealing gasket is provided on the upper surface of the support frame, the anti-vortex device comprises an inverted umbrella-shaped plate whose shape matches the support frame, an anti-vortex central axis whose bottom can be inserted into the guide bearing is provided at the center of the inverted umbrella-shaped plate, the anti-vortex central axis can slide in the guide bearing along the height direction, the anti-vortex plates are evenly arranged on the upper surface of the inverted umbrella-shaped plate, and the lower surface of the inverted umbrella-shaped plate is in contact with the sealing gasket due to gravity.

3. The anti-vortex multistage pump according to claim 2, characterized in that: The inverted umbrella-shaped plate is evenly provided with a plurality of anti-vortex holes.

4. The anti-vortex multistage pump according to claim 2, characterized in that: The guide bearing is press-fitted onto the base through a bearing gland with a sealing ring.

5. The anti-vortex multistage pump according to any one of claims 1 or 2, characterized in that: The anti-vortex plate is a thin plate arranged in a "cross" shape, and the center of the "cross" of the thin plate is coaxial with the pump shaft of the motor.

6. The anti-vortex multistage pump according to claim 1, characterized in that: The multi-stage impellers are arranged in series with each other.

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