What is a non negative pressure variable frequency water supply unit

The non-negative pressure variable frequency water supply equipment is based on the municipal pipe network as the water source, making full use of the original pressure of the municipal pipe network, forming a closed continuous relay pressurized water supply mode, with good energy-saving effect and no secondary pollution of water quality, which is the development and extension of frequency conversion constant pressure water supply equipment. On the basis of the pressure of the municipal pipe network, the water supply is directly stacked, which saves energy, and also has many advantages such as fully enclosed, pollution-free, small land occupation, quick installation, reliable operation and convenient maintenance.

How it works. The non-negative pressure variable frequency water supply equipment is put into use, the water of the tap water pipeline network enters the steady flow tank, the air in the tank is discharged from the vacuum eliminator, and the vacuum eliminator is automatically shut down after the water is full. When the pressure of the tap water pipe network can meet the water requirements, the system directly supplies water to the water pipe network by the bypass check valve; When the pressure of the tap water pipe network can not meet the water requirements, the system pressure signal is fed back to the frequency conversion controller by the remote pressure gauge, the water pump runs, and automatically adjusts the speed and constant pressure water supply according to the size of the water consumption.

When the pump supplies water, if the water volume of the tap water pipe network is greater than the flow rate of the pump, the system maintains normal water supply: when the water consumption peaks, if the water volume of the tap water pipe network is less than the flow rate of the small pump, the water in the steady flow tank can still be supplied normally as a supplementary water source, at this time, the air enters the steady flow tank by the vacuum eliminator, and the vacuum in the tank is destroyed, which ensures that the tap water pipe network does not produce negative pressure, and the system returns to the normal water supply state after the peak water use. When the water pipe network stops water, causing the liquid level of the steady flow tank to drop continuously, the liquid level detector feeds back the signal to the frequency conversion controller, and the pump automatically shuts down to protect the pump unit.

When the water supply is small at night and the pressure of the water pipe network cannot meet the requirements, the air pressure tank can store and release energy, avoiding the frequent start of the water pump.

What is a Water Supply Unit? It's hard to say from the decision, the following is just my opinion; Some high-rise water supply is divided into several sections of water supply, such as; 1-7 floors are a section, 8-16 floors, 17-25 floors, etc., these equipment are installed in a water supply room, at this time we can call the equipment in this water supply room a water supply unit, not necessarily accurate, please refer to.

1) Control mode of steady current compensator and vacuum suppressor.

When the water supply of the municipal pipe network is insufficient or the water consumption of the user is greater than the supply capacity of the municipal pipe network, the vacuum suppressor is opened, and the air enters the steady flow compensator, so that the originally closed compensator becomes a broken water tank, and the negative pressure generation is inhibited.

2) Self-controlled current limiting mode.

When the water supply of the municipal pipe network is insufficient or the water consumption of the user is greater than the supply capacity of the municipal pipe network, through the feedback of the pressure sensing signal, the frequency converter is limited to make the pump not take more water, and when the water supply of the municipal pipe network meets the requirements, the system returns to normal.

3) Pressure control point method.

When the water supply of the municipal pipe network is insufficient or the water consumption of the user is greater than the supply capacity of the municipal pipe network, the variable flow constant pressure water supply pump will be directly started, and the system will return to normal after the water supply meets the requirements.

The non-negative pressure water supply equipment makes full use of the original pressure energy of the tap water pipe network, and in the case of the same water supply demand, the pump and control equipment with relatively small power can be selected, and at the same time, the tap water pressure is used to directly supply water without starting the pump in the case of small flow of water at night. Compared with the traditional water supply equipment with a pool, it can save a lot of power operation costs and investment costs.

The non-negative pressure pressurized water supply equipment adopts the water pump and the tap water pipe network to be directly connected, the pressure regulating tank is used as the water pump water inlet water storage device, the vacuum eliminator is used to eliminate the negative pressure generated in the pipe network, and the secondary pressurization of the water supply is realized on the basis of making full use of the original pressure of the tap water pipe network, the equipment not only realizes the purpose of pressurization (and will not affect the water of other users of the pipe network at all), but also saves the investment of building a water pool and water tank, and can make full use of the original water pressure of the pipe network while ensuring the water quality of the pipe network (no secondary pollution). The energy-saving effect is extremely significant, up to more than 50%. Fully automatic intelligent control of non-negative pressure water supply equipment, with a variety of protection and control functions, can achieve true unattended.

To put it simply, it is not allowed to connect the water inlet directly to the water supply pipe.

Differences in the operating principle of the equipment:

1. Frequency conversion constant pressure water supply requires water tank storage. The water supply unit pumps water from the tank to supply water to the user.

2. No negative pressure water supply equipment, no water tank is required, and the water supply system comes with a steady flow tank, which can store a small amount of water.

In the design, the pressure without negative pressure is calculated, and the water pressure of the tap water is subtracted, so the head of the pump is lower.

During operation, the water supply in the low area, and the non-negative pressure equipment can use the pressure of the tap water pipe network to supply water without starting the water pump.

However, no matter what the situation is, the constant pressure inverter equipment needs to start the water pump to supply water.

When the water is stopped, the non-negative pressure equipment will stop the water supply, and the variable frequency constant pressure water supply can be effectively provided for 2 days according to the specifications because there is a water tank to store water.

Zhengzhou Tianhai frequency conversion water supply equipment manufacturer. The starting balance of constant voltage variable frequency water supply equipment can be limited to the rated current, so as to avoid the impact on electricity when starting.

The easiest way is not to connect directly to tap water, but to connect directly to no negative pressure.

Changsha Huadu water supply non-negative pressure water supply equipment is directly connected to the water pipe, and the frequency conversion water supply equipment is directly connected to the water tank or pool, in the configuration of the non-negative pressure water supply equipment than the frequency conversion water supply equipment has one more non-negative pressure tank.

There is no negative pressure and direct docking with the municipal pipe network, and the pressure of the pipe network is used to save electricity and water.

Variable frequency constant pressure water supply is pumped from the water tank (pool), which is not as energy-saving as non-negative pressure water supply.

The secondary frequency conversion water supply needs to be set up with a living water tank, and the water tank can be omitted for non-negative pressure water supply, but the non-negative pressure water supply device has an impact on the water pressure of the municipal pipe network, and the pressure of the municipal pipe network is required to be not less than 1 kg, and there are many restrictions on use. The negative pressure water supply also has a frequency conversion function.

Comparative advantages and disadvantages:

Variable frequency constant pressure water supply:

1. There needs to be a water tank, once the water is precipitated, there will inevitably be some pollution, but once the water is stopped, the water in the water tank can also be used for half a day to a day.

2. The non-negative pressure water supply is more energy-saving, and the original pressure of tap water is fully utilized.

3. There are many restrictions on the installation conditions of non-negative pressure equipment, and local water companies are restricted; If the inlet opening of the tap water is small, it is not possible to ensure sufficient inlet water pressure and cannot be used.

4. No negative pressure equipment, no water tank, small footprint.

They are all right. The simplest difference is that there is no inlet line for variable frequency constant pressure water supply equipment. Non-negative pressure water supply equipment with inlet and outlet pipes.

Strictly speaking, non-negative pressure water supply equipment belongs to a kind of frequency conversion constant pressure water supply equipment, but insiders distinguish them.

Principle of non-negative pressure water supply equipment: tap water enters the regulating tank, the air in the tank is discharged from the vacuum eliminator, and the vacuum eliminator is automatically closed after the water is full. When the tap water can meet the water pressure and water volume requirements, the water supply equipment directly supplies water to the water pipe network through the bypass check valve; When the pressure of the water pipe network cannot meet the water requirements, the system gives the pump signal through the pressure sensor (or pressure controller, electric contact pressure gauge) to start the pump operation.

When the pump supplies water, if the water volume of the tap water pipe network is greater than the flow rate of the pump, the system maintains normal water supply, during the peak period of water consumption, if the water volume of the tap water pipe network is less than the flow rate of the water pump, the water in the regulating tank can still be supplied normally as a supplementary water source, at this time, the air enters the regulating tank by the vacuum eliminator, the negative pressure of the water pipeline network is eliminated, and the system returns to a normal state after the peak period of water consumption. If the water level in the regulating tank is continuously falling due to insufficient tap water supply or pipe network water outage, the level controller gives a pump shutdown signal to protect the pump unit. The water can be supplied through a small expansion tank at night and during a small flow of water to prevent the pump from starting frequently.

The function of the inverter: reduce the shock load caused by the motor start, achieve the purpose of soft start, and at the same time improve the efficiency of the power grid and the motor: the pressure can be adjusted through the inverter.

1.Different ways of supplying water.

a.The non-vacuum water supply is directly connected to the water network, but the use of the non-vacuum water supply equipment requires the consent of the local waterworks.

b.Constant pressure variable frequency water supply equipment needs to use water tanks or water towers, which occupy a larger area.

2.Differences in water storage capacity.

a.There is no water tank for non-negative pressure water supply equipment, water tower water storage, so the water storage capacity is very poor, if the water plant is out of water, the water will be basically stopped, the selection of non-negative pressure water supply equipment still depends on the local water supply situation, if the water is stopped at two ends in three days, it is still forgotten, but this situation basically does not exist. There is also a kind of non-negative pressure water supply equipment with a water tank, box-type non-negative pressure water supply equipment, which can alleviate the problem of water outage in the waterworks to a certain extent, but according to the size of the water tank equipped, the equipment cost will be higher.

b.Constant pressure variable frequency water supply equipment, because it is generally equipped with large water tanks and water towers, as long as it is not a long-term water outage, the impact on water supply is not very large.

3.Differences in water quality and hygiene.

a.Since the non-negative pressure water supply equipment is directly connected to the tap water pipe network, there will be no secondary pollution to the water during the water supply.

b.The water tower water tank of constant pressure variable frequency water supply equipment must pay attention to cleanliness and hygiene to avoid secondary pollution, and the water tank also needs to be cleaned regularly.

It's all inverter water supply. It's just that the working principle is different

Non-negative pressure variable frequency water supply is to have one more non-negative pressure tank on the inlet side of the pump, which can be directly connected to the municipal pipe network, and will not affect the water pressure of the municipal pipe network during operation. The equipment of Changsha Huadu water supply is not bad.

Frequency conversion constant pressure water supply equipment; Equipment that uses an inverter to drive an electric motor to supply water.

Non-negative pressure water supply equipment; A device that pressurizes the water supply from the municipal water supply pipeline directly through the pump without passing through the pool.

Non-negative pressure water supply equipment is a kind of energy-saving water supply equipment developed in recent years, I am specialized in this kind of equipment, the energy-saving effect is really good, in fact, the non-negative pressure water supply equipment uses a frequency converter should also be called frequency conversion constant pressure water supply.

Hello, the biggest difference between them is that the non-negative pressure water supply equipment is directly connected to the municipal water pipeline, and uses the pressure of the municipal tap water. In this way, the municipal pressure will not be wasted, and the energy saving effect is great, because it is directly connected to the municipal water pipeline, to avoid secondary pollution. Frequency conversion constant pressure water supply equipment is generally connected to the pool and water tank, there is no initial pressure, and it completely depends on the water supply equipment.

The non-negative pressure water supply equipment has a non-negative pressure tank, and the frequency conversion constant pressure water supply mainly has a frequency converter. If you are from Sichuan and Chengdu, you can find our company to do it, we have done a lot of projects.

Frequency conversion constant pressure water supply equipment, including non-negative pressure water supply equipment, non-negative pressure water supply equipment, and its own connection with the tap water official website.

Non-negative pressure variable frequency water supply is a kind of direct connection to the municipal pipe network without affecting the municipal pipe network. On the basis of the original frequency conversion constant pressure, the water supply method superimposes the pressure of the municipal pipe network and the pressure of the lifting pump, so as to make the domestic water supply more energy-saving and environmentally friendly.

The non-negative pressure variable frequency water supply equipment is composed of a variable frequency control cabinet, a non-negative pressure device, an automatic control system and a remote monitoring system, a pump unit, a pressure stabilizing compensator, a negative pressure eliminator, a pressure sensor, a valve, an instrument and a pipeline system.