Fire pumps, as the name implies, are pumps used for fire fighting. Fire pumps are imported foreign products and are divided into different types according to different classifications to be fully sealed, leak-free and corrosion-resistant.

　　Widely used in environmental protection, water treatment, fire fighting and other departments, is used to pump all kinds of liquid, is the ideal pump to create a leak-free, pollution-free civilized workshop, civilized factory and fire fighting system. Pump types are similar, only the head and flow rate are different.

　　The selection of fire pumps should be based on the process flow, drainage requirements, and other five aspects to be considered.

　　Fire pumps are different from ordinary life pumps, the difference is that.

　　(1) Fire pumps are used to ensure the water quantity and pressure of fire fighting water, involving personal safety and property protection, and must operate more reliably. The pump body is required to be more reasonable in structure, more appropriate in material and more reliable.

　　(2) Fire fighting flow is relatively regular. Fire hydrant water supply system to 5L / s as a step increment. Automatic sprinkler system to corresponding to the light danger level, medium danger level, serious danger level flow value incremental.

　　(3) Fire pump water supply is generally used by the pump directly to the fire extinguishing facilities (fire hydrant, sprinkler head) water supply. In the initial fire fighting or self-test operation for the small flow of water supply, in the fire development stage according to the design flow of water supply. When the pump flow ~ head curve is steep, it is easy to produce overpressure phenomenon when running at low flow, for which corresponding technical measures should be taken.

　　(4) The fire pump is used to extinguish the fire, requiring rapid, timely, corresponding requirements for the fire pump priming time is shorter than ordinary life pump, start performance to better.

There are many ways to classify fire pumps. According to whether there is a power source, they can be divided into: fire pumps without power sources (referred to as pumps); fire pump sets (referred to as pump sets), and fire pumps without power can be classified according to the following rules:

1. According to the occasion of use, it can be divided into: fire pumps for vehicles, fire pumps for ships, fire pumps for engineering, and fire pumps for others.

2. According to the outlet pressure level, it can be divided into low-pressure fire pumps, medium-pressure fire pumps, medium-low pressure fire pumps, high-pressure fire pumps, and high-low fire pumps.

3. According to the auxiliary features, it can be divided into ordinary fire pumps, deep well fire pumps and submersible fire pumps.

4. According to the purpose, it can be divided into water supply fire pump, voltage stabilized fire pump, and foam liquid fire pump.

The following is a brief introduction to several types of fire pumps.

Sprinkler pump: It is a fixed device in the fire sprinkler system. It is widely used at present and has the characteristics of low price, long life and high fire extinguishing efficiency. The fire sprinkler system can also work synchronously with other fire-fighting facilities, which can effectively control and extinguish the initial fire.

Stabilizing pump: The flow rate of the stabilizing pump is small. Usually, water is taken from the fire pool or high-level fire water tank and sent to the system to maintain the pressure in the system pipeline. When a fire occurs, it provides the flow for starting the system until the main fire pump starts. , the stabilizing pump needs to be equipped with a backup pump.

Fire hydrant pump: Fire hydrant pumps are divided into vertical single-stage, vertical multi-stage, horizontal multi-stage, horizontal single-stage and other structural forms, mainly used for pressurized water delivery in fire hydrant systems. The flow range of the transported liquid is generally 5-80L/s, the pressure range is 0.2-2.25MPa, the supporting power range is 1.5-200kW, and the diameter range is Ф50-Ф250mm.

Noise is one of the most common problems when mechanical equipment is running. In order to better use and maintain equipment, we need to have a certain ability to distinguish whether it is normal operating noise or noise caused by equipment failure. And the noise generated by different parts also means that there may be different fault problems in the equipment. Shanghai Xizhiquan is a professional fire pump manufacturer, and the company's professional engineers will share with you various reasons for the noise of the motor and coupling.

1. Motor noise
When the motor is noisy, we need to distinguish whether it is the airflow noise of the motor cooling fan or other possible abnormal noises of the motor. The main causes of abnormal noise are as follows:

a) The frictional noise generated between the cooling fan and the fan cover can be checked by removing the fan cover to see if the noise disappears. You can make a judgment and adjust the fan blades and fan cover to solve this problem.

b) There are two main reasons for the failure of the motor rotor bearing. One is that the bearing is rusted due to water ingress, and the other is that the motor heats up abnormally. It is necessary to replace the motor bearing to solve the abnormal sound.

2. Coupling running noise
For a water pump with an elastic coupling, if the coupling part produces periodic abnormal noises and rubber powder falls off during operation, it can be basically judged that the noise is caused by poor alignment between the pump shaft and the motor shaft, and it needs to be shut down Re-align the shaft.

The fire pump is an indispensable type of equipment in the fire water supply system. Besides the fire pump and motor, what other equipment should be included? The following Shanghai Xizhiquan will popularize it for you.

1. Dual power supply cabinets that provide electrical energy for the fire protection system
2. In order to ensure the normal start and operation of the pump motor, the necessary control circuit is the starter cabinet
3. Pipeline valves, switch pressure gauges, etc., which can ensure normal water pressure.
The above several major components can form a complete fire water supply system, all of which are indispensable.

When inspecting the water supply system, not only the water pumps and motors are inspected, but also the power supply, start-up control cabinet and pipe valves also need to be inspected regularly, so as to ensure that the entire fire extinguishing water system can operate normally when a fire comes.

working principle

Fire pump check valve refers to the valve that relies on the flow of the medium itself to automatically open and close the disc to prevent the backflow of the medium, also known as check valve, one-way valve, reverse flow valve and back pressure valve. The check valve is a kind of automatic valve, its main function is to prevent the reverse flow of the medium, the reverse rotation of the pump and the drive motor, and the discharge of the container medium. Check valves are also used on lines that supply auxiliary systems where the pressure may rise above system pressure. Check valves can be mainly divided into swing check valves (rotating according to the center of gravity) and lift check valves. The function of this type of check valve is to only allow the medium to flow in one direction and prevent the flow in the opposite direction. Usually this kind of valve works automatically. Under the action of fluid pressure flowing in one direction, the valve disc opens; when the fluid flows in the opposite direction, the valve seat is acted on by the fluid pressure and the self-weight of the valve disc to cut off the flow.

Among them, the check valve belongs to this type of valve, which includes swing check valve and lift check valve. The swing check valve has a hinge mechanism, and a door-like disc freely leans on the inclined seat surface. In order to ensure that the valve clack can reach the proper position of the seat surface every time, the valve clack is designed in the hinge mechanism, so that the valve clack has enough swing space, and makes the valve clack truly and comprehensively contact with the valve seat. The disc can be made entirely of metal, or it can be inlaid with leather, rubber, or a synthetic cover on the metal, depending on the performance requirements. When the swing check valve is fully open, the fluid pressure is almost unimpeded, so the pressure drop through the valve is relatively small. The disc of the lift check valve is located on the sealing surface of the valve seat on the valve body. Except that the valve disc can rise and fall freely, the rest of the valve is like a globe valve. The fluid pressure makes the valve disc lift from the sealing surface of the valve seat, and the backflow of the medium causes the valve disc to fall back to the valve seat and cut off the flow. According to the conditions of use, the disc can be of all-metal structure, or in the form of a rubber pad or rubber ring inlaid on the disc frame. Like the globe valve, the passage of fluid through the lift check valve is also narrow, so the pressure drop through the lift check valve is larger than that of the swing check valve, and the flow rate of the swing check valve is limited. rare.

Fire pump, vacuum technology is a technology that uses imported vacuum pumps, vacuum units and other vacuum systems to complete specific processes, and is widely used in various industrial production and scientific research work. Such as: petroleum (vacuum distillation), chemical industry, canned food, metallurgy, light bulbs and electron tubes and other production, the equipment generally adopts vacuum technology.

Vacuum pump Vacuum level Vacuum technology

The level of vacuum is determined by the remaining pressure after the air and other material vapors in the container are drawn out. The more pumped out, the lower the pressure inside the container, that is, the higher the vacuum. However, Yazhiled Electromechanical Technology reminds everyone that there is no absolute vacuum. The level of vacuum is represented by "vacuum degree", and its unit is mmHg or "Torr". 1 Torr is 1 millimeter of mercury.


Fire pumps and metering pumps are mainly composed of three parts: power drive, fluid delivery and regulation control. The power drive device drives the fluid delivery diaphragm to reciprocate through the mechanical linkage system:

The diaphragm (piston) will be inhaled by the delivery fluid in the first half of the stroke and discharged from the pump head in the second half; therefore, changing the reciprocating frequency of the stroke or the stroke length of each reciprocating movement can achieve the purpose of adjusting the fluid delivery volume . Precise processing accuracy ensures the pumping volume each time and realizes the precise metering of the conveyed medium.



Metering pump basic working principle

Due to the difference in power drive and fluid delivery methods, metering pumps can be roughly divided into two types: plunger type and diaphragm type.

1. Plunger metering pump

There are mainly two kinds of ordinary valve pumps and valveless pumps. Piston metering pumps are widely used in the petrochemical industry because of their simple structure and high temperature and high pressure resistance. Aiming at the deficiency of ordinary plunger pumps for high-viscosity media under high-pressure conditions, a valveless rotary plunger metering pump has received more and more attention, and is widely used in high-viscosity media such as syrup, chocolate and petroleum additives. metered addition. Due to the structural disadvantage of the inability to achieve complete isolation between the metered medium and the lubricant in the pump, plunger metering pumps are subject to many limitations in fluid metering applications with high anti-pollution requirements.

2. Diaphragm metering pump

As the name suggests, the diaphragm metering pump uses a specially designed and processed flexible diaphragm to replace the piston, and realizes reciprocating motion under the action of the driving mechanism to complete the suction-discharge process. Due to the isolation effect of the diaphragm, the isolation between the fluid to be metered and the driving lubrication mechanism is truly realized structurally. The high-tech structural design and the selection of new materials have greatly improved the service life of the diaphragm, coupled with the excellent corrosion resistance of the composite material, the diaphragm metering pump has become the main pump type in fluid metering applications. Among the members of the diaphragm metering pump family, the hydraulically driven diaphragm pump uses oil to evenly drive the diaphragm, which overcomes the shortcomings of excessively concentrated force on the diaphragm of the pump under the mechanical direct drive method, and improves the life of the diaphragm and the upper limit of the working pressure. In order to overcome the working failure caused by the diaphragm damage that may occur in single-diaphragm metering pumps, some metering pumps are equipped with diaphragm damage to realize automatic chain protection when the diaphragm is broken; the metering with double-diaphragm structure pump head further improves its safety. , suitable for applications that are particularly sensitive to security protection.

As a kind of diaphragm metering pump, the electromagnetic drive metering pump uses electromagnets to generate pulsating driving force, which saves the motor and speed change mechanism, making the system small and compact, and is an important branch of small-range low-pressure metering pumps.