Problems with the parameters of submersible sewage pumps, problems in the engineering use of submers

The relationship between the motor current of the centrifugal pump and the head and the flow rate of the centrifugal pump motor current is proportional to the head and flow, and the head is inversely proportional to the flow rate under the premise of the same power of the same pump. When the outlet valve of the centrifugal pump is closed, because the head is unchanged, the flow rate is reduced, then the current of the pump is reduced, if it is fully closed, the current is the smallest, but it is slightly greater than the idling, because the water has resistance. When the current of the centrifugal pump is the smallest, it is idling, that is, there is no water in the pump body, and it is directly connected to the atmosphere.

When the centrifugal pump current is maximum, it is when the inlet is connected to the source, such as water, and the outlet is not restricted, such as directly connected to the atmosphere, not even the pipeline, at this time, the flow rate is the largest, and the current of the pump will be the largest. The motors matched with the water pump are calculated according to the rated flow rate, and if there is no restriction like this, it may cause the motor to overload and burn out. Therefore, when the pump is installed, a pressure gauge must be installed at the outlet to facilitate the flow control and ensure the normal operation of the equipment.

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The 80m flow head can be obtained by referring to the curve graph.

Motor power = flow * head * 9800 pump working efficiency * 1000 * 3600

In the engineering use of submersible sewage pumps, common problems include the following aspects:

Pump blockage: Because the sewage contains more impurities and solid particles, it will lead to the blockage of the pump body, impeller and other components, affecting the normal operation of the pump. The pump body and impeller need to be cleaned and maintained regularly to avoid the accumulation of impurities and solid particles.

Motor overload: When the load of the pump is too large or malfunctioning, it will lead to the overload of the motor, which will affect the normal operation of the pump. It is necessary to troubleshoot and overhaul the motor in time to ensure the normal operation of the motor.

Water leakage: In the use of submersible sewage pumps, water leakage of pump body, sealing ring and other components often occurs, and it is necessary to replace the damaged seals in time to prevent the leakage of the pump.

Unqualified quality: When purchasing submersible sewage pumps, it is necessary to pay attention to the quality and performance parameters of the product, and choose regular brands and products with shelter protection. Avoid using low-quality and unqualified products, which will affect the use effect and safety.

To sum up, when using submersible sewage pumps, it is necessary to pay attention to the quality and performance of the product, regular maintenance and upkeep, timely troubleshooting, and avoid overload and other problems. In this way, the normal operation and long-term use of the submersible sewage pump can be guaranteed.

When it comes to the selection of submersible sewage pumps, everyone should still have some understanding, the following is the basic information of Zhongda Consulting for construction people to sort out the selection and precautions of submersible pump submersible sewage pumps, the specific content is as follows:

The drainage pumps used in buildings include submersible sewage pumps, submersible non-clogging sewage pumps, vertical sewage pumps and horizontal sewage pumps. Due to the small site in the building and the small drainage volume, the drainage pump can give priority to the submersible sewage pump and the submerged non-clogging sewage pump, of which the submerged sewage pump is generally used in important places; Vertical sewage pumps and horizontal sewage pumps require seismic isolation foundations, self-filling water absorption, and occupy a certain amount of space, so they are rarely used in buildings.

The flow rate of the drainage pump should be selected according to the second flow rate of the domestic drainage design; When there is a displacement adjustment, it can be selected according to the maximum hourly flow rate of domestic drainage. The flow rate of the drainage pump in the fire elevator sump is not less than 10L s. The head of the drainage pump is determined according to the lifting height and pipeline loss, and then a certain free head is added.

Free head should be used. The flow rate of the suction pipe and outlet pipe of the drainage pump should not be less than and should not be greater than. A standby pump should be set up in each domestic drainage collection tank in the public building, and it should be operated interactively at ordinary times.

Basement, equipment room, garage to flush the ground drainage, if there are two or more drainage pumps, do not need to use pumps.

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When the sump cannot be equipped with an accident drainage pipe, the pump should have uninterrupted power**; When the drainage inlet pipe can be closed, there is no uninterruptible power**, but an alarm device should be set. When lifting sewage and wastewater with large impurities, the outlet pipes of submersible sewage pumps in different sumps should not be combined and discharged; When lifting general wastewater, the submersible sewage pump outlets of different sumps can be considered for combined discharge according to the actual situation. When two or more pumps share a single outlet pipe, valves and check valves should be installed on the outlet pipe of each pump.

When there is a possibility of backflow in the drainage of a single pump, a check valve should be installed. It is not allowed to combine the pressure drain with the gravity drain pipe in the building. When the submersible sewage pump is lifted and contains large pieces of debris, the submersible sewage pump should be equipped with a crushing device; When lifting sewage containing more fibers, it is advisable to use a large-channel submersible sewage pump.

When the motor power of the submersible sewage pump is greater than or equal to or the diameter of the outlet pipe is greater than or equal to DN100, the fixed autocoupling device of the pump can be used; When the motor power of the submersible sewage pump is less than or the diameter of the outlet pipe is less than DN100, the hose can be installed in a mobile manner. When the sewage collection tank is drained by a submersible sewage pump, a fixed self-coupling device for the pump should be set up to facilitate the maintenance of the pump. The dewatering pump should be able to start and stop automatically and manually on site.

Multiple pumps can be operated in parallel and alternately, or they can be put into operation in sections.

There are some differences between submersible sewage pumps and general sewage pumps in terms of structure, application and working principle. Here are their main differences:

Structure: Submersible Sewage Pump: As the name suggests, a submersible sewage pump is a pump that can work completely immersed in liquid. Its motor and pump body are integrated, and the motor part has waterproof and anti-corrosion functions, which is suitable for submersible work.

General sewage pump: usually ground mounted, the pump body and motor are separated. The pump needs to be installed above the water surface, suck water into the pump through a suction pipe, and then discharge the water through the outlet pipe.

Application scenario: Submersible sewage pump: widely used in municipal engineering, construction sites, industrial and mining enterprises and other places, for the discharge of sewage containing solid particles, fibers and mixtures, as well as a variety of corrosive or abrasive media.

General sewage pump: mainly used in industrial, municipal and construction fields, for the discharge of domestic sewage, rainwater and industrial wastewater. However, when dealing with sewage that contains a lot of solid particles or fibers, problems such as clogging or abrasion may occur.

Working principle: Submersible sewage pump: Since the pump is immersed in water, its water absorption process is relatively simple. The motor drives the impeller in the pump to rotate, generating centrifugal force that causes the sewage to enter the pump body from the suction inlet and then discharge through the outlet pipe.

General Sewage Pumps: Before starting, the pump needs to be filled with water to remove the air in the pump. Once activated, the pump sucks in the sewage through a suction pipe and then uses centrifugal force to drain the water. These pumps may require a check valve and a foot valve to prevent backflow after the pump is shut down.

In short, there are certain differences between submersible sewage pumps and general sewage pumps in terms of structure, application and working principle. When choosing the right pump, it is necessary to consider the actual application scenario and needs.

Submersible sewage pump is commonly used equipment for pumping clean water and corrosive media, and is suitable for a wide range of industries, including paper industry, cement plants, power plants, pharmaceuticals, etc., this article will introduce the characteristics and applications of submersible sewage pumps.

9 features of submersible sewage pumps:

1. The submersible sewage pump can be equipped with a fully automatic control cabinet according to the needs of users, which can automatically protect the pump from water leakage, leakage, overload and overtemperature, etc., and improve the safety and reliability of the product.

2. There are two different installation methods for submersible sewage pumps, fixed automatic coupling installation system and mobile free installation system.

3. The overall structure of the submersible sewage pump is compact, small in size, low in noise, low in energy consumption, easy to maintain, no need to build a pump room, and it can work in the submersible, which greatly reduces the project cost.

4. The submersible sewage pump is equipped with a high-precision interference and leakage detection sensor in the sealed oil chamber, and a thermal element is embedded in the stator winding to automatically protect the pump motor.

5. The mechanical seal of the submersible sewage pump adopts a new type of hard and corrosion-resistant titanium tungsten material, which can make the pump run safely and continuously for more than 8000 hours.

6. The float switch of the submersible sewage pump can automatically control the start and stop of the pump according to the required liquid level change, without special supervision, and it is very convenient to use.

7. The submersible sewage pump adopts a single or double wheel structure, which greatly improves the ability of dirt to pass through, and can effectively pass through the fiber material of the pump diameter and the solid particles with a diameter of about 50% of the pump diameter.

8. The submersible sewage pump can be used in the full head to ensure that the motor will not be overloaded.

9. WQ series submersible sewage pump can be equipped with double guide rail automatic coupling installation system according to user needs, which brings greater convenience to installation and maintenance, and people do not have to enter the sewage pit for this purpose.

Submersible sewage pump is a kind of water pump used for the transportation and discharge of sewage, dirt, wastewater, etc., with the following characteristics:

Submersible design: Submersible sewage pumps usually adopt submersible design, that is, the pump itself is completely submerged in the liquid, which can effectively improve the wear resistance and corrosion resistance of the pump.

Automatic operation: The submersible sewage pump can be started and stopped automatically, and can be automatically controlled according to the change of water level without manual intervention.

Large flow and high head: The flow rate and head of the submersible sewage pump are generally large, which can effectively transport a large amount of sewage and sewage to meet the needs of different occasions.

High reliability: The submersible sewage pump adopts advanced design and materials, which has high reliability and durability, and can operate stably for a long time.

Easy maintenance: Submersible sewage pumps are usually modular in design, which is easy to disassemble and repair, which can save maintenance costs and time.

In short, the submersible sewage pump has the advantages of simple structure, high degree of automation, stable operation and convenient maintenance, and has been widely used in sewage treatment, building drainage, agricultural irrigation, industrial production and other fields.

Submersible sewage pump product features:

1.The sewage pump adopts a unique single-piece or double-vane impeller structure, which greatly improves the ability of dirt to pass through, and can effectively pass through 5 times the diameter of the pump fiber material and the diameter of about 50% of the pump diameter of solid particles.

2.The mechanical seal is made of new hard and corrosion-resistant tungsten titanium, which can make the pump run safely and continuously for more than 8000 hours.

3.The overall structure of the sewage pump is compact, small in size, low in noise, remarkable in energy saving, convenient in maintenance, no need to build a pump room, and can be operated by diving into the water, which greatly reduces the project cost.

4.The sealed oil chamber of the sewage pump is equipped with a high-precision anti-interference water leakage detection sensor, and a thermal element is embedded in the stator winding to actively maintain the pump motor.

5.The submersible sewage pump can be equipped with a fully active control cabinet according to the needs of users, and actively maintain the water leakage, leakage overload and overtemperature of the pump, which improves the safety and reliability of the product.

6.The float switch can change according to the required liquid level, and actively control the start and stop of the pump, without special supervision, which is very convenient to use.

The series of sewage pumps can be equipped with a double-rail active coupling device system according to the needs of users, which brings greater convenience to the installation and repair, and people do not need to enter the sewage pit for this purpose.

8.The sewage pump can be used in full head to ensure that the motor is not overloaded.

9.There are two different types of devices, the fixed active coupling system and the mobile free device system.

The submersible sewage pump is mainly put into the sewage and operated by submersible. Zhiliu sewage pump, stainless steel integrated molding, S1 standard motor, can continuously and stably discharge sewage with stable performance.

There are many types of submersible sewage pumps on the market, but do you really understand the meaning of the types and models of these sewage pumps? What do those letters and numbers represent? The national standard "Submersible Electric Pump for Sewage and Dirt" (GB T24674-2021) answers these questions in detail.

One. The type of submersible sewage pump

1.The electric pump is a single-stage or multi-stage vertical structure, and the pump is coaxial with the motor.

2.Electric pumps are divided into the following according to the structure of the impeller

a.Cyclone impeller;

b.semi-open vane impeller;

c.Closed-blade impeller;

d.Single or double runner impellers;

e.spiral centrifugal impeller;

f.Francis impeller;

g.Axial flow impeller.

3.The type characteristics of the electric pump are represented by uppercase Chinese pinyin letters:

a) X--cyclone type;

b) H--Mixed-flow type;

c) Z--axial flow type.

The impeller structure is flow channel type, spiral centrifugal type, closed type and semi-open type are not marked.

4.The characteristics of the electric pump motor are represented by uppercase Chinese pinyin letters:

a) S - water-filled type;

b) y--oil-filled type;

c) d--single-phase;

d) G--high voltage (660V and below three-phase dry motors are not marked).

5.The enclosure protection level of the electric pump is IPX8 specified in GB T49421-2006. The level of protection for special requirements shall be determined by the supplier and the supplier through negotiation according to the provisions of GB T.

6.The quota of Shen Pump is based on the continuous duty system (S1).

Two. Submersible sewage pump model

1.The model of the electric pump is composed of uppercase Chinese pinyin letters and Arabic numerals, etc., and the representation method is as follows.

2.Supplementary marking refers to the description or identification of the necessity of the product made by the enterprise according to the contract or regulations, with or without marking as needed.

Example 1: The specified flow rate is 4860m3 h, the specified head is 54m, the rated power is 185kw, the supporting three-phase motor, the voltage is 380v, the mixed-flow sewage sewage submersible electric pump, which is marked as:

Example 5: The specified flow rate is 50m h, the specified head is 15m, the rated power is, the supporting three-phase motor, the voltage is 380V, the closed stainless steel sewage sewage submersible electric pump, which is marked as;

Supplementary marking refers to the description or identification of the necessity of the product made by the enterprise according to the contract or regulations, with or without marking as needed.