CN201065544Y - Negative pressure-free continuous frequency conversion water supply installation - Google Patents

Abstract

The utility model discloses a non-negative pressure uninterrupted frequency conversion water supply device, which comprises a water storage tank [3] connected with a water supply pipe network; The booster pipeline [8] and the automatic control system [13] that adjusts the speed of the water pump through the frequency converter according to the water pressure at the inlet and outlet of the booster pipeline [13]; When the water pressure T _i at the inlet end of the pressure pipeline is lower than the set value _T2 , the water pressure at the outlet end of the booster pipeline [8] is automatically reduced to maintain the uninterrupted operation of the water pump, so as to reduce the number of times the water pump starts and stops, and saves electric energy. Extend the service life of the water pump. Especially suitable for high-rise water supply and living quarters.

Description

Non-negative pressure uninterrupted frequency conversion water supply device

technical field

The utility model relates to a non-negative pressure uninterrupted water supply device which supplies water to users and can pressurize.

technical background

The building water supply pressurization system adopted in our country has roughly gone through three stages. The first stage is to adopt the method of "reservoir + water pump + high-level water tank". All the water that needs to be pressurized from municipal water enters the water storage tank first, and then is pressurized by a fixed-speed pump and sent to the user. The high-level water tank is used for high and low peak water consumption. Adjustment function; the second stage adopts the method of "water storage tank + frequency conversion speed regulating water pump". The result is reduced power, which saves power consumption to a certain extent. There are obvious shortcomings in the water supply equipment in the above two stages: one is that there are open water storage facilities, and the water quality is easily polluted when the water contacts with the atmosphere; The residual pressure of the municipal water supply can be used, and this part of unused energy will be a considerable amount of electricity bills after a long time. The current non-negative pressure water supply equipment can overcome the above problems. Chinese patent CN2551689Y discloses a non-negative pressure automatic frequency conversion booster water supply equipment, which is composed of a sealed water storage tank, a booster water pump group and a frequency conversion control circuit. The water from the network is sent to the sealed water storage tank, and then pressurized by the booster pump for users to use. Since the sealed water storage tank is not in contact with the atmosphere, secondary pollution of the water quality can be avoided; and the water flow of the municipal water supply network When it reaches the water inlet of the pump, the residual pressure can be superimposed to be used as the head, and the water pump only supplements the insufficient part of the set water pressure and the residual pressure, so it is more energy-saving. However, at night, especially in the second half of the night, because the user goes to bed, the water consumption is less, but the water pump frequently runs at a low speed, wasting electric energy.

Contents of the invention

The purpose of this utility model is to provide a non-negative pressure uninterrupted frequency conversion water supply device, which can be shut down at night when the water consumption is small, so as to protect the motor and save energy.

The utility model is realized as follows: it includes a water storage tank connected with the water supply pipe network, the water storage tank is equipped with a negative pressure suppressor; a group of booster tubes composed of several water pumps connected in parallel at the outlet of the water storage tank According to the water pressure at the inlet and outlet of the booster pipeline, the automatic control system that adjusts the speed of the water pump through the frequency converter; the outlet of the booster pipeline is connected with a pressure storage tank. When the water consumption is small at night, the water pump can be turned off, and the water pressure in the pressure storage tank can be used to supply water to users.

The utility model not only saves the power consumption of the water pump in the second half of the night by using the energy storage of the pressure storage tank, but also allows the equipment to rest; it fully utilizes the pressure of the original tap water pipe network, and reduces the energy consumption. Especially suitable for high-rise water supply and living quarters.

Description of drawings

Fig. 1 is the structural representation of the utility model.

Fig. 2 is a program logic block diagram of the automatic control system of the utility model.

Detailed ways

As shown in Figure 1, the tap water pipe 1 of the water supply pipe network is connected to the water inlet of the lower part of the water storage tank 3 through the valve 2, and the negative pressure suppressor 4, namely the exhaust valve, is installed on the top of the water storage tank 1, and the negative pressure suppressor 4 is installed Water diversion pipe 5 is arranged, so as to avoid water splashing. The pressurization pipeline 8 is composed of several parallel water pumps 10, the water inlet of each water pump is connected with the water outlet of the lower part of the water storage tank 1, the specific number of water pumps is determined according to the required water supply, the water inlet and outlet of each water pump Both are equipped with valve 8, and a check valve 11 is installed at the water outlet end, a bypass branch pipe 12 equipped with a check valve is also connected in parallel on the booster pipeline 8, and the inlet and outlet ends of the booster pipeline 8 are installed There is a water inlet pressure sensor 7 and a water outlet pressure sensor 14, and a pressure storage tank 15 is installed between the outlet end of the booster pipeline and the user end 16. The electrical signals of the water inlet pressure sensor 7 and the water outlet pressure sensor 14 are sent to the automatic control system 13, and the system sends instructions to the frequency converter through control algorithm and logic judgment to control the speed and start and stop of the water pump 10.

The specific working process is as follows: first open the water inlet valve 2 to fill the water storage tank 3 with water, after the air in the water storage tank 3 is emptied through the negative pressure suppressor 4, the negative pressure suppressor is closed, and then a start command is issued, as shown in Figure 2 As shown, the control system first judges the water inlet pressure signal T _i collected by the water inlet pressure sensor, whether the water inlet pressure meets the requirements, if it meets the pressure requirements, it is greater than the set pressure T ₁ , the water pump does not work, and the Bypass branch pipe for water supply; otherwise, start the water pump, automatically adjust the speed of the water pump according to the pressure signal of the water outlet pressure sensor, and automatically stabilize the outlet pressure of the water pump to T _S under the premise of satisfying the water supply, so as to achieve the set outlet pressure ; If one water pump cannot meet the water supply requirements, the system will start other water pumps.

When the incoming water from the jellyfish pipe is insufficient, the water stored in the water storage tank first supplements the insufficient water supply, that is, when T _i is less than the set value T ₂ , the water level in the water storage tank drops, the negative pressure suppressor operates, and air enters the water storage tank In the body, the signal T _i measured by the water inlet pressure sensor is the height of the water level in the water storage tank, and the system enters the automatic depressurization operation program, and the automatic control system automatically lowers the outlet pressure of the water pump according to the height of the water level in the water storage tank , by reducing the outlet pressure of the pressurized pipeline to maintain the balance of water in and out of the water storage tank, so as to ensure that the water pump does not stop to the maximum extent. When the water level in the water storage tank, that is, T _i is lower than the lower limit _T4 , the pump is automatically stopped; when T _i returns to normal and the water level in the tank is higher than the upper limit, the pump is automatically started to enter the normal state. In addition, there is also a fire water supply program. When the system receives a fire signal, it will automatically switch to the fire pressure state.

Usually, the water consumption at night is small. When the water consumption F, that is, the outlet flow rate of the pressurized pipeline is lower than the set value F ₁ , the system enters the small flow working procedure, relying on the pressure stored in the pressure storage tank to maintain a small amount of water. When T When _O is less than the set small flow exit pressure value _T3 , the pump is automatically turned on to pressurize the pressure storage tank.

The utility model ensures that no vacuum will be generated in the water supply pipeline; it ensures continuous water supply to the greatest extent; especially the energy storage of the pressure storage tank not only saves the power consumption of the water pump in the second half of the night, but also allows the equipment to rest; it fully utilizes the original water pipe Net pressure, reducing energy consumption. Especially suitable for high-rise water supply and living quarters.

Claims (1)

1. negative-pressureless successive frequency conversion water supply device comprises a water tank that connects with water supply network [3], and negative pressure inhibition device [4] is housed on the water tank; The one group of pressure piping [8] formed by several water pumps [10] that are connected in parallel on the water tank delivery port and the automatic control system [13] of regulating pump rotary speed according to the hydraulic pressure of pressure piping entrance end, by variable-frequency governor; It is characterized in that: be connected to accumulator [15] on the pipeline of pressure piping delivery port.

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