Causes of Fire Pump Vibration and How to Maintain Multistage Pumps
There are many reasons for the vibration of the unit and the building of the pump room, and some factors are related and interacted with each other. In summary, there are mainly the following four reasons.

1. Electrical aspects The motor is the main equipment of the unit. The unbalanced magnetic force inside the motor and the imbalance of other electrical systems often cause vibration and noise. For example, during the operation of an asynchronous motor, the radial alternating magnetic pull between the stator and rotor is generated by the interaction of the harmonic flux of the stator and rotor teeth, or during the operation of a large synchronous motor, the magnetic center of the stator and rotor is inconsistent or the air gap in each direction is different Exceeding the allowable deviation value, etc., may cause periodic vibration and noise of the motor.

2. In terms of machinery, the quality of the rotating parts of the motor and water pump is unbalanced, shoddy, poor installation quality, the axis of the unit is asymmetrical, the swing exceeds the allowable value, the mechanical strength and rigidity of the parts are poor, the bearings and sealing parts are worn and damaged, and the water pump is critical. The resonance caused by the rotating speed and the natural frequency of the unit will produce strong vibration and noise.

3. In terms of hydraulics, the flow rate and pressure distribution of the pump inlet is not uniform, the pressure pulsation of the working liquid at the pump inlet and outlet, liquid circumvention, bias flow and shedding, non-rated working conditions and pump cavitation caused by various reasons are common. Causes of pump unit vibration. Rapid changes in pressure in the water pipeline and water hammer caused by dynamic transition processes such as pump start and stop, valve opening and closing, working condition changes, and accident emergency shutdown often cause vibrations in the pump room and unit.

4. In terms of hydraulics and other aspects, unreasonable design of the water inlet channel of the unit or not matching the unit, improper submersion depth of the water pump, and unreasonable start-up and shutdown sequence of the unit, etc., will deteriorate the water inlet condition, generate vortex, induce cavitation or aggravate Vibration of unit and pump room. When the unit using destructive siphon vacuum cut-off is started, if it is difficult to entrain the air in the hump section, the siphon time will be too long; the flap door design of the unit with flap valve cut-off is unreasonable, and it opens and closes constantly, constantly hitting the flap seat; support The uneven subsidence of the foundation of the water pump and the motor or the poor rigidity of the foundation will also cause the unit to vibrate

The daily maintenance of the fire pump is very important. It is necessary to take care of it frequently. It will shorten the service life of the pump. So, if you are interested, you can take a look at

10 aspects that need to be paid attention to in water pump maintenance:

1. Regularly check whether there is no shortage of oil at the refueling point of the motor and the pump body, and whether the sound of the bearing running during the operation of the pump is normal

2. Is the concentricity of the electricity coupler and the pump coupler consistent?

3. Whether there is water leakage or air leakage in the suction pipe of the water pump

4. Whether the balance pipe is blocked. 5. Whether the outlet pressure of the water pump is normal

6. Whether the water pump vibrates too much during operation

7. Is the bearing seat of the water pump overheated?

8. Is the manual cranking flexible?

9. Is the installation foundation of the water pump firm?

10. The water pump uses packing seals, which need to be fastened or replaced frequently

Fire pump power saving measures and how to make the fire pump run smoothly
1. Adopt high-efficiency and energy-saving water pumps and high-efficiency and low-loss motors, and improve the efficiency of transmission devices.

2. Correctly select the power of the pump motor. Prevent "big horses and small carts". Replace the overcapacity water pump motor. When the power of the motor is much greater than the actual need, the method of replacing the motor can be used to save electricity.

3. Choose a reasonable lift. When the head of the pump leaves too much margin. It will waste electric energy, so the head of the pump's operating point should be reasonably determined. 4. Reduce pipeline resistance. Eliminate redundant pipe fittings, unnecessary turns and sharp angles on the pipeline to reduce pipeline resistance and reduce unit power consumption for water delivery.

The methods to reduce pipeline resistance include:

①. Pipeline design should be reasonable.

②. Increase the pipe diameter or use double pipe drainage to reduce the flow rate.

③. Shorten the length of the pipeline as much as possible, reduce joints, elbows and valves, and especially avoid the appearance of sharp angles.

④. Improve the smoothness of the inner wall of the pipeline or add a coating.

⑤. Remove the dirt on the inner wall of the pipeline in time.

5. Water pump speed regulation saves electricity. The power consumption of the water pump is proportional to the cube of the speed of the unit, so the speed of the unit should be changed according to the actual load conditions. Can greatly save electric energy. Adopting pump speed regulation measures, the initial investment is relatively large, but the power saving effect is remarkable, especially suitable for large-capacity water pumps. It should be noted that the larger the head, the flatter the resistance curve, even if the speed changes slightly, the flow rate will change greatly, and the power saving effect is poor.

6. Transform the pump impeller. When the flow rate of the pump in use is larger than the actual flow rate required, and the speed control cannot be used or the price of the speed control device is uneconomical, the impeller of the original pump can be turned or replaced to reduce the flow rate and Head, in order to reduce the running power consumption of the pump.

If the feedwater pump is designed using the same conversion method, after obtaining the speed n of the required operating conditions, the individual arcs of the corresponding operating conditions can be converted according to the formula: or the rotating speed and multi-stage The characteristic curve of the fire pump's initial and final operating conditions is the first step in the design and calculation of the feed water pump. In order to make the feed water pump run quietly and reliably under all operating conditions, the extremely serious condition is to ensure that no cavitation occurs under each operating condition, and the guarantee condition for no cavitation should be given by the front Booster pump supply for the water pump. Design and calculation of pre-boosted fire pump The pre-boosted pump is referred to as the booster pump for short, it is placed before the suction of the boiler feed water pump, and provides the feed water pump with sufficient suction pressure to avoid cavitation under operating conditions . Before designing and calculating the booster pump, it is necessary to first confirm the design calculation flow and head value of the single-stage fire pump. It is precisely because of the connection between the booster pump and the feedwater pump that the exact design and calculation parameters of the booster pump are all related to the corresponding working condition parameters of the feedwater pump.

The impeller is eccentrically installed in the pump body. When the impeller rotates according to the correct direction, the water entering the fire pump body is thrown to the limit by the impeller. Due to the influence of centrifugal force, the water forms a uniform thickness similar to the pump cavity. closed water ring. The upper inner surface of the water ring happens to be tangent to the impeller hub, and the lower inner surface of the water ring just meets the top of the blades (actually, the blades have a certain insertion depth in the water ring). At this time, a crescent-shaped space is formed between the hub of the impeller and the water ring, and this space is divided into several small cavities equal to the number of blades by the impeller. If starting from the upper part of the impeller at 0°, then when the impeller of the fire pump rotates 180° before the rotation, the volume of the small chamber gradually increases from small to large, the pressure decreases continuously, and it communicates with the suction port on the suction and exhaust pan , when the pressure in the small chamber space is lower than the pressure in the pumped container, according to the principle of gas pressure balance, the pumped gas is continuously drawn into the small chamber, and it is in the process of inhalation.

When the inhalation is completed, it is isolated from the inhalation port, the volume of the small cavity is gradually decreasing, and the pressure is continuously increasing. exhaust. And the volume of the small cavity communicated with the exhaust port further reduces the pressure to further promote. When the pressure of the gas is stronger than the exhaust pressure, the compressed gas is discharged from the exhaust port. During the continuous operation of the pump, Continuously carry out the process of suction, compression and exhaust, so as to achieve the purpose of continuous pumping.

In the water ring pump, the auxiliary exhaust valve is a special structure, generally using a rubber ball valve, its function is to submerge the phenomenon of over-compression and under-compression generated during the operation of the pump. Both phenomena will cause excessive power consumption. In order to solve this problem, a rubber ball valve is generally installed under the exhaust port, so that when the fire pump chamber reaches the exhaust pressure prematurely, the ball valve will automatically open and the gas will be discharged, eliminating the over-compression phenomenon. Generally, when designing a water ring pump, the minimum suction pressure is used to determine the compression ratio, so as to determine the starting position of the exhaust port, so as to solve the phenomenon of insufficient compression.

Fire pump diversion time and how to polish the fire pump
As an important tool for fire fighting and disaster relief and saving lives and properties, fire pumps have a fast response speed, especially the water diversion time must be very short, so as to reduce losses. How is the water diversion time estimated?
1. The estimation formula affecting the water diversion time of the fire pump is derived according to the standard atmospheric pressure. When the test air pressure is not a standard atmospheric pressure, the estimation formula should be corrected.
2. Since the height is relatively small, and the fire pump also has the exhaust function at this time, the time for this process is very short and has little effect on the overall calculation results. The results of the water diversion time test of the fire pump show that the calculated results using the estimation formula are basically consistent with the measured data, and the error is small.
The fire pump is a prop used for disaster relief and fire extinguishing. The water diversion time is short. After the calculation, the next step will be to pay attention to the calculation to reduce losses and will be more used in various industries.
3. Many factories will be equipped with some fire-fighting tools such as fire pumps. In case of accidental fire, it becomes a tool needed for fire fighting, so many manufacturers will choose it, and its appearance affects the user's choice of it, so after production , you can choose the following polishing methods:
4. Flame polishing: use flame to soften and bake the surface of the fire pump, and fire impact can remove some diagonal lines and wrinkled skin on the surface. Many mouths will be flame polished after cutting the mouth, but this treatment method will reduce the surface of the pump. flatness.
5. Polishing with polishing powder: This method is to rub the surface of the fire pump at high speed to remove scratches. Before polishing, the polishing part must be polished with an abrasive belt. This method uses many materials, and the best effect is cerium oxide, but this The process speed is relatively slow.
6. Acid treatment and polishing: Use acid to corrode the surface of the fire pump for surface treatment. Before polishing, it is also necessary to use abrasive belts to polish, because acid polishing will reduce the thickness of the equipment itself a lot, and it may not be able to completely remove the surface texture.
Polishing is a way to renew the appearance of the fire pump. In order to make the product have a bright appearance and attract customers to buy, many manufacturers will polish the product according to the characteristics of the product to remove the traces of the appearance.

How can the use of diesel engine fire pumps be more energy efficient?

Here are several methods for your reference:

1. Optimize the pipeline structure of the pump body: reduce elbows, shorten the pipeline, and the pipeline with the same diameter is 1 meter shorter, which can save about 0.5 catties of diesel oil in ten hours; expand the diameter of the outlet pipe, if the 4-meter-long 10cm outlet pipe is replaced by 15 Centimeter tube, ten hours can save 1 catties of diesel.

2. Keep the diesel oil in the equipment clean: After the fuel tank has been used for a long time, there will be some impurities and sediments at the bottom of the tank, which will affect the normal work of the plunger and the fuel injector. It should be cleaned or purified regularly. Otherwise, it is easy to cause inaccurate fuel supply timing, uneven fuel supply, poor atomization of fuel, etc., resulting in increased fuel consumption and reduced power.

3. Remove carbon deposits in time: Diesel fuel will generate high temperature during combustion, making ash carbon polymers adhere to valves, valve seats, fuel injectors, piston tops, etc. If not cleaned in time, it will increase fuel consumption and seriously affect the normal operation of the engine. Work.

4. Maintain an appropriate cooling water temperature: the cooling water temperature of the diesel pump engine should be kept at 45-65°C. If the water temperature is too low, it will cause incomplete combustion of diesel oil and increase the load of the machine itself. Note that it is best to use "soft water" without minerals (such as distilled water and rainwater) for cooling water, and sewage and muddy water should not be abused.

5. Don't overload the operation: The overload operation of the diesel engine water pump in the form of a small horse-drawn cart will turn a considerable part of the diesel into black smoke, which will not play its due role, increase fuel consumption, and shorten the service life of related parts.

"Nurture is more important than treatment, prevention is more important than repair", diesel engine fire pumps should pay attention to maintenance and maintenance, regularly check and adjust the diesel engine water pump valve clearance, fuel injection pressure, fuel supply time, etc., and timely eliminate scale and dirt on the cooling water jacket. Vulnerable valves, fuel injectors and other components are repaired and replaced in a timely manner. Important parts are always in good condition, with high operating efficiency and the most fuel-efficient.

Why is the diesel engine fire pump very hot after starting for a while?

As people's awareness of fire protection continues to increase, various enterprises, units, and individuals pay more and more attention to fire protection systems, and diesel engine fire pumps are also favored by more and more people. With the development of the fire fighting equipment industry, the various automation performances of diesel engine fire pumps are becoming more and more perfect. The diesel engine fire pumps developed so far have various automation, intelligence, remote control, automatic alarm and other functions.

We all know that when a fire breaks out, the circuit is very easy to be forced to short circuit or open circuit. At this time, if it is an electric diesel engine equipment, it will not be able to start, which will affect the normal operation of the fire pump equipment, which may cause huge losses.

In contrast, the diesel engine pump set has greater advantages and is independent of the power supply system. There may be various problems in the operation of the equipment, among which excessive temperature is one of the common phenomena. The professional technicians of Shanghai Xizhiquan summed up the following several possibilities that lead to the overheating of the diesel engine fire pump.

1. Overwork;
2. The oil radiator is blocked, resulting in poor heat dissipation;
3. The adjustment switch of the oil temperature is improperly operated, and the engine oil is not well dissipated;
4. The cylinder leaks, and high-temperature gas enters the oil pan, causing the temperature of the oil in the oil pan to rise;
5. The cooling fan of the air-cooled machine has not played an effective role. It may be that the speed is too low, which leads to an increase in the body temperature of the diesel engine.


In order to better ensure the reliable operation of the fire protection system, it is inseparable from perfect daily management. Although with the development of science and technology, the current diesel engine fire pump has various intelligent features, zjbetter's perfect management is essential, and regular inspection is very important.

Diesel fire pumps have four "automatic" advantages
Diesel engine fire pumps can be used for emergency water supply in community buildings or factory warehouses. When a fire occurs, the power supply fails, and the electric fire pumps cannot be put into use normally, the diesel engine fire pumps can be automatically started and put into operation according to the signal to provide fire water supply to ensure Fire extinguishing is carried out normally.
Diesel engine fire pump is a kind of electromechanical integrated equipment that is directly driven by fire pump and can start and complete water supply in a short period of time. The pump set is driven by diesel and does not need an external power supply. It is suitable for various fire water supply occasions such as agricultural irrigation, emergency rescue, smelting, hangars, petrochemical oil depots, liquefied gas stations, and textiles. Especially when the power supply is not satisfactory, diesel engines are used. Driving water pumps is a reliable and guaranteed equipment choice.

The diesel engine fire pump has a high degree of automation and can be connected to the control center according to the needs. It is easy to install and use, easy to maintain and maintain, and also has automatic, manual and fault self-checking functions. The whole process monitors the working status, can restore the function of automatic restart after failure of starting, automatic pre-lubrication and pre-heating, making the equipment start-up safer and more reliable.

Diesel engine fire pumps are equipped with various automatic functions to meet the requirements of national standards, ensuring long-term normal standby of the equipment and putting it into fire fighting work at any time. The four "automation" advantages of Xizhiquan diesel engine fire pump are summarized:

1. Automatic operation: When the diesel engine pump unit receives an effective fire signal or remote control start signal, the equipment will automatically start and run; when the electric fire pump power supply system is powered off or loses a signal, the unit will automatically stand by. Start for 10S, if it cannot start and run, it will stop for 10S, and then restart, the unit will automatically repeat three times

2. Automatic charging: Stand by in the automatic position at ordinary times. If the battery voltage is too low, it can use the mains to automatically charge; when the battery voltage is sufficient, it will automatically stop charging to avoid damage to the battery and ensure the smooth start of the unit.

3. Automatic alarm: multiple startup failure alarm, diesel engine low oil pressure alarm, diesel engine water temperature super high alarm, diesel engine overspeed alarm, battery low voltage alarm, charging failure alarm, fuel shortage indication alarm

4. Automatic preheating: make the diesel engine in a hot engine standby state to ensure emergency work at low temperature