How to correctly judge the inlet and outlet of the centrifugal pump

The inlet and outlet of the pump are generally low in and high out.

Centrifugal pump. It is to use the rotation of the impeller to make the water centrifugal motion to work. Before the pump starts, the pump casing and suction pipe must be filled with water, and then the motor is started to make the pump shaft drive the impeller and water to do high-speed rotation movement, and the water undergoes centrifugal movement, which is thrown to the outer edge of the impeller and flows into the pressurized water pipeline of the pump through the flow channel of the snail pump casing.

The basic structure of the centrifugal pump is composed of six parts, namely impeller, pump body, pump shaft, bearing, sealing ring, and stuffing box.

1. The impeller is the core part of the centrifugal pump, its speed is high and the output is large, and the blades on the impeller play a major role. The inner and outer surfaces on the impeller need to be smooth to reduce frictional losses from the water flow.

2. The pump body is also called the pump casing, which is the main body of the pump. It plays the role of support and fixation, and is connected with the bracket on which the bearing is mounted.

3. The function of the pump shaft is to connect the coupling with the motor to transmit the torque of the motor to the impeller, so it transmits mechanical energy.

The main components.

4. Sliding bearing.

Clear oil is used as a lubricant, and oil is added to the oil level. Too much oil will seep out along the pump shaft, too little bearing will overheat and burn out and cause accidents! During the operation of the water pump, the temperature of the bearing is up to 85 degrees, and the general operation is about 60 degrees.

5. The sealing ring is also known as the leakage reduction ring.

6. The stuffing box is mainly composed of packing and water sealing.

It is composed of a ring, a packing barrel, a packing gland and a water seal pipe. The function of the stuffing box is mainly to close the gap between the pump casing and the pump shaft, so that the water in the pump does not flow to the outside and the outside air does not enter the pump.

This depends on what kind of pump it is, and the situation is different for different pumps.

Multistage centrifugal pump, close to the motor end as the inlet;

The horizontal single-stage pump is generally horizontal in and vertical out;

Vertical multistage pumps, vertical single-stage pumps, generally have a label on the pump, indicating the direction of water flow, needless to say;

The outlet of submersible pumps and deep well pumps is generally at the top, and the middle or bottom is the inlet.

1. From the direction of the motor end to the pump, the left-hand side is the steering of the inlet pump, and the direction indicated by the arrow is the outlet, and the other is radial, so the axial direction is the inlet, and the radial direction is the outlet.

2. The inlet and outlet of the pump are radial, and vice versa.

3. Large imports and small exports.

4. The impeller can be seen from the flange is the outlet.

5. One of the inlets and inlets of the pump is axial.

The centrifugal pump uses the rotation of the impeller to make the water centrifugal move to work. Before the pump starts, the pump casing and suction pipe must be filled with water, and then the motor is started to make the pump shaft drive the impeller and the water to do high-speed rotation motion, and the water undergoes centrifugal motion, which is thrown to the outer edge of the impeller and flows into the pressurized water pipeline of the pump through the flow channel of the volute pump casing.

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There is also a method: for general centrifugal pumps, clockwise rotation is forward rotation, and counterclockwise rotation is reversal. 1. Standing at the end of the motor hood, if the fan blade of the motor is pumping inward for forward rotation, blowing outward is reversed. 2. The steering arrow is generally marked on the pump shell, if the steering is consistent with the arrow indication is positive rotation, otherwise it is reversed.

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Each centrifugal pump has its own suitable operating zone, i.e. the flow rate should not be too large or too small; The head should not be too large or too small. When selecting a centrifugal pump, you must look at the characteristic curve of the pump. The operating range of the centrifugal pump cannot exceed the range of the solid line in the characteristic curve of the pump.

The working curve of the centrifugal pump is obtained from the test in the pump factory, and the pipeline characteristic curve should be considered in the application, and the point where the two curves intersect is the actual working point of the pump.

The working point of the centrifugal pump refers to the intersection of the characteristic curve of the centrifugal pump and the characteristic curve of the pipeline, that is, the centrifugal pump works in the pipeline of the system, and the energy given by the pump is equal to the energy consumed by the pipeline to transport the liquid is called the working point of the centrifugal pump.

Before the pump starts, the pump casing and suction hand must be quietly filled with water, and then the motor is started to make the pump shaft drive the impeller and the water to do high-speed rotation movement, and the water undergoes centrifugal motion, which is thrown to the outer edge of the impeller and flows into the pressurized water pipeline of the pump through the flow channel of the volute pump casing.

The suitable working range of the centrifugal pump means that the flow rate and head of the pump are within a certain range, which can meet the working requirements of the equipment or system, and ensure the safety and stability of the pump during operation.

To determine the suitable operating range of a centrifugal pump, the following factors need to be considered:

Flow: According to the working requirements and system flow requirements, select the rated flow rate of the pump or determine the flow range of the pump according to the actual demand.

Head: According to the characteristics of the conveying medium and the requirements of the system head, select the rated head of the pump or determine the head range of the pump according to the actual demand.

Pump working temperature, pressure and other parameters: according to the nature of the conveying medium, determine the pump material, sealing form, wear resistance, corrosion resistance and other parameters.

Pump operation status: According to the working status, working conditions and operating environment of the pump, select the appropriate pump type and installation method to ensure the stable operation and safety of the pump.

To sum up, judging the appropriate working range of a centrifugal pump requires a comprehensive consideration of various factors to ensure that the pump can operate stably within the design requirements and meet the working requirements of the system or equipment.

Look at the flow-efficiency curve of the pump and don't deviate too much from the highest efficiency point.

How to judge the import and export of pumps that have been put into production?

1. The diameter of the pump outlet pipe is generally smaller than that of the inlet;

2. Look at the pump in the direction of the motor, and the inlet is generally in the lower right part of the pump head;

3. The general outlet has pressure gauge, check valve, guide shower, etc.;

4. If it is not installed, the impeller can be seen from the flange mouth is the outlet;

5. If one of the inlet and outlet of the pump is axial and the other is radial, then the axial direction is the inlet and the radial direction is the outlet;

6. If the inlet and outlet of the pump are radial, then from the direction of the motor end to the pump, the left hand side is the inlet, and the right hand side is the outlet;

7. Generally, the pump manufacturer will mark the steering of the pump on the pump body, so the direction indicated by the arrow is the outlet, and vice versa.

Problems with the size of the inlet and outlet of the connecting pipes of the pump and the pump.

The suction port of the pump is generally larger than the outlet, because the suction port is low pressure, the density of the water is small and the flow rate is slow, in order to meet the requirements of water supply balance and ensure that the inlet has a certain pressure head to prevent cavitation, it is generally large; The flow rate of the outlet is fast, and the flow rate of the same pipe diameter is large, so it is decided that the connected water intake port should be larger than the water outlet. The large diameter of the mouth pipe is small and the suction resistance is small, which is conducive to the pump to suction the medium, and the small diameter of the outlet pipe is conducive to the maintenance of the pressure at the outlet of the pump.

Whether the diameter of the inlet and outlet pipe of the centrifugal pump is larger than the diameter of the inlet and outlet of the pump itself, this problem also needs to be analyzed in detail, for most pumps, the purpose of increasing the diameter of the inlet and outlet pipe is to reduce the flow rate of the fluid in the pipeline, so as to reduce the resistance drop of the pipeline, so as to ultimately reduce the power consumption of the pump, but the increase of the pipe diameter is at the cost of increasing the investment cost of the pipeline, in this way, for the pipeline where the pump outlet is a long distance, the pipe diameter can be considered to be appropriately increased, so as to reduce the resistance drop, and for the short distance, it can not be considered; For materials that are prone to cavitation, such as liquefied gas, temperature close to boiling point, and low suction position, the diameter of the pump inlet pipe should be increased to reduce the resistance drop and avoid cavitation of the pump.

Generally, the diameter of the suction pipe of the pump is generally larger than the diameter of the outlet pipe, and the flow rate of the suction pipe is also different according to the pipe diameter. When the pipe diameter is less than 250, it is 1, and the pipe diameter is 250 1000 m s, from the technical consideration, the maximum speed of the water flow should not exceed the meter second, and the minimum speed should not be less than the meter second (to prevent deposition).

The pump generally has the direction of the pump marked, and the direction indicated by the arrow is the outlet, and vice versa.

Imports are large, exports are small.

The one that can see the impeller from the flange is the outlet.

The inlet and outlet of the pump are axial and radial, so the axial direction is the inlet and the radial direction is the outlet.

The inlet and outlet of the pump are all radial, so from the motor end to the direction of the pump, the left hand side is the inlet, and the right hand side is the outlet.

The inlet of the horizontal centrifugal pump is in front of the pump casing, and the outlet is above the pump casing; The inlet and outlet diameters of vertical centrifugal pumps are the same size and on the same level.

The common faults of centrifugal pumps are, water seal breathable, large bearing clearance, and difficult air discharge. etc,

The working point of the pump is related to the characteristics of the pipeline where it is located, depending on whether you want to find the best working point in the operation process, you can do the experiment first, generally the best working point is near the best efficiency point.

The pump is designed after the pump has the operating point, but the pump operating point is generally near the optimal efficiency point of the pump.

Summary. This is because the pressure of the system is large, although the pump is not running, but the high-pressure water still overflows from the outlet of the pump, and the water that comes out is just not as high as the pressure of the pump, which is often not surprising, especially the pressurized version is the most prominent. Thank you for your trust, the above is my reply, I hope it can help you, I wish you a happy life <>

This is because the pressure of the system is larger, although the pump is not running, but the high-pressure water is still overflowing from the outlet of the water fanhu pump, and the water that comes out is just not as high as the pressure of the pump. Thank you for your trust, Yichang sedan chair is my reply, I hope it can help you, I wish you a happy life <>

There is always water draining, how to solve this problem.

Close the inlet and outlet after stopping the pump, and it will continue to flow if there is a height difference. So there is still a height for him to flow.

It's not that the pump is broken.

Kiss, no.

Normally, it shouldn't be out of the water, why is the water coming out, is it the pressure of the water tank that presses the water out? ? Still is??

Does centrifugal pumps also have such problems?

Kiss me and you'll understand.

It's all the same.