CN210315789U - Double-system secondary water supply equipment - Google Patents

Abstract

The utility model discloses a dual system secondary water supply equipment, including no negative pressure frequency conversion water supply equipment, its characterized in that: the connection part of the water outlet of the variable-frequency speed-regulating water pump unit and a user pipe network is provided with an electric contact pressure gauge, a relay and an alternating current contactor are arranged in the variable-frequency control cabinet, and the electric contact pressure gauge, the relay, the alternating current contactor, the variable-frequency speed-regulating water pump unit and a power supply are connected through a wire. When PLC or the converter of variable frequency control cabinet broke down, the water pump was shut down, was replaced main control system by auxiliary control system and supplies power to the water pump unit, carries out interim control, and the technical staff can in time get rid of the trouble under the circumstances of not stopping water, has avoided the circumstances of large tracts of land cutting off the water to take place. And the PLC and the frequency converter have the system self-checking function, when a fault occurs, the system can perform self-checking recovery, and the auxiliary control system can strive for time for the self-checking recovery of the main control system, so that the maintenance frequency is greatly reduced.

Description

Double-system secondary water supply equipment

Technical Field

The utility model relates to a water supply equipment especially relates to dual system secondary water supply equipment.

Background

The water supply height of a municipal tap water pipe network in modern life is only about 30 meters generally, and a large number of high buildings such as elevator apartments and the like and part of high places in cities can meet the normal water use of high-rise residents only by adopting a secondary pressurized water supply mode. The most common secondary water supply equipment in the market is non-negative pressure variable frequency water supply equipment, pressure sensors are arranged at a water inlet and a water outlet, monitored pressure change data signals are transmitted to a PLC (programmable logic controller), a central processing unit of the PLC is used for calculation and comparison, and a frequency converter is controlled to adjust the rotating speed of a water pump set, so that stable water pressure supply is realized. The water supply mode makes full use of the speed regulation principle of the frequency converter, and can accurately control the water pressure to ensure that the fluctuation of the water supply pressure is not too large. However, the whole control link involves multiple steps of signal acquisition, central operation and frequency conversion and speed regulation, and requires the cooperative work of electrical elements such as a pressure sensor, a frequency converter, a PLC and the like. And soft faults of the PLC and the frequency converter in a complex control system are common. When a problem occurs, the water pump is generally recovered after manual treatment, and the water pump is generally in a shutdown state during the fault treatment period, so that water supply of a district or a high-rise building is stopped. Partial products are controlled to be started and stopped by setting a manual switch for a single water pump, namely, when equipment is overhauled, the control cabinet can be switched to a manual mode, and the water pump is manually started to supply water. At this time, the water pump is in power frequency operation, and the pressure cannot be set. If the rated lift of the water pump is high, overpressure of a water supply pipe network is easy to occur, and pipe explosion and overpressure alarm are caused.

SUMMERY OF THE UTILITY MODEL

The utility model aims to overcome when current no negative pressure frequency conversion water supply equipment PLC and converter system fault maintenance appear, the water pump is shut down and is caused the technical problem that the district or the high-rise of building cut off water, provides one kind and has two system secondary water supply equipment that can automatic switch-over when two independent control system, system trouble.

The utility model provides a technical scheme that its technical problem adopted is: double system secondary water supply equipment, frequency conversion control cabinet including built-in PLC controller, install the stationary flow jar of vacuum inhibitor, variable frequency speed control water pump unit and pressure sensor, the water inlet and the running water pipe network of stationary flow jar are connected, its kneck is equipped with into water pressure sensor, the delivery port of stationary flow jar is connected with the water inlet of variable frequency speed control water pump unit, the delivery port and the user pipe network of variable frequency speed control water pump unit are connected, its kneck is equipped with out water pressure sensor, it is intake sensor, play water pressure sensor and variable frequency speed control water pump unit are connected with the frequency conversion control cabinet, its characterized in that: the connection part of the water outlet of the variable-frequency speed-regulating water pump unit and a user pipe network is provided with an electric contact pressure gauge, a relay and an alternating current contactor are arranged in the variable-frequency control cabinet, and the electric contact pressure gauge, the relay, the alternating current contactor, the variable-frequency speed-regulating water pump unit and a power supply are connected through a wire.

The utility model discloses a theory of operation is, after no negative pressure frequency conversion water supply equipment inserts the water pipe network, the water of water pipe network gets into the stationary flow jar, and the jar interior air is discharged from the vacuum eliminator, treats that water is full of the back, vacuum eliminator self-closing. When the pressure of the tap water pipe network can meet the water use requirement, the system directly supplies water to the water use pipe network through the bypass check valve; when the pressure of the tap water pipe network can not meet the water consumption requirement, a system pressure signal is fed back to the variable frequency controller by the outlet pressure transmitter, the water pump operates, the rotating speed is automatically adjusted according to the water consumption, the water is supplied at constant pressure, and if the operating water pump reaches the power frequency rotating speed, the other water pump is started to operate in a variable frequency mode. When the water pump supplied water, if the water yield of water pipe network was greater than water pump flow, the system kept normally supplying water: when the water consumption peak (during the water pipe network water yield changes undulant), if the water pipe network water yield is less than water pump flow (water pipe network flow is not enough to satisfy water pump flow), water in the stationary flow jar still can normally supply water as the supplementary water source, and at this moment, the air gets into the stationary flow jar by vacuum eliminator, and jar interior vacuum suffers destruction, has ensured that the water pipe network does not produce the negative pressure, and the water consumption peak is crossed the back (after the fluctuation), and the system resumes normal water supply state again. When the tap water pipe network stops water supply, the inlet pressure transmitter feeds back a signal to the variable frequency controller, and the water pump is automatically stopped so as to protect the water pump unit. When the water supply is carried out at night at a small flow and the pressure of a tap water pipe network cannot meet the requirement, the air pressure tank can store and release energy, so that the frequent starting of a water pump is avoided. When converter or PLC broke down, the water pump is in the shutdown state, when running water pipe network normal water was used, when pressure reduced the lower limit that the electric contact pressure gauge that adds set up gradually, lower limit contact switch-on, signal transfer to relay, relay control ac contactor, ac contactor control water pump unit operation, when pressure reachd the upper limit of electric contact pressure gauge's setting, upper limit contact switch-on, signal transfer to relay, relay control ac contactor, ac contactor control water pump unit shuts down, water supply line normal water pressure fluctuation is great this moment, still can satisfy the water demand. When the PLC and the frequency converter are recovered to be normal, the power supply of the water pump unit is gradually transferred to the frequency conversion control cabinet by the auxiliary control system to supply power, at the moment, the pressure runs within a preset value set by the frequency conversion control cabinet, and the pointer of the electric contact pressure gauge is maintained between the upper limit and the lower limit, so that the power supply of the water pump unit is stopped.

The beneficial effects of the utility model reside in that: the auxiliary control system which is composed of an electric contact pressure gauge, a relay and an alternating current contactor and is independent of a main control system composed of a variable frequency control cabinet is additionally arranged in the non-negative-pressure variable frequency water supply device, when a PLC or a frequency converter of the variable frequency control cabinet breaks down, the water pump is stopped, the auxiliary control system replaces the main control system to supply power to the water pump unit, temporary control is carried out, technical personnel can timely eliminate faults under the condition of not stopping water, and the condition of large-area water stop is avoided. And the PLC and the frequency converter have the system self-checking function, when a fault occurs, the system can perform self-checking recovery, and the auxiliary control system can strive for time for the self-checking recovery of the main control system, so that the maintenance frequency is greatly reduced.

Drawings

FIG. 1 is a schematic structural view of a dual system secondary water supply apparatus;

fig. 2 is a schematic circuit diagram of a dual system secondary water supply apparatus.

Detailed Description

Embodiment 1, combine fig. 1 below, fig. 2 is right the utility model discloses do further explanation, dual system secondary water supply equipment, use no negative pressure frequency conversion water supply equipment as the basis, its subassembly includes frequency conversion control cabinet 1 of built-in PLC controller, install vacuum inhibitor's stationary flow jar 2, frequency control water pump unit 3 and pressure sensor, the water inlet and the running water pipe network 7 of stationary flow jar are connected, its kneck is equipped with into water pressure sensor 4, the delivery port and the frequency control water pump unit 3's of stationary flow jar water inlet are connected, frequency control water pump unit's delivery port and user pipe network 8 are connected, its kneck is equipped with out water pressure sensor 5, water sensor, go out water pressure sensor and frequency control water pump unit and frequency control cabinet connection, its characterized in that: the joint of a water outlet of the variable-frequency speed-regulating water pump unit and a user pipe network is connected with a three-way pipe, an electric contact pressure gauge 6 is arranged on the three-way pipe, two intermediate relays and an alternating current contactor are arranged in a variable-frequency control cabinet, one of the two intermediate relays is a normally-open intermediate relay K2 and is provided with two groups of normally-open contacts, the other one is a normally-closed intermediate relay K1 and is provided with a group of normally-closed contacts, the upper limit signal and the lower limit signal of the electric contact pressure gauge are connected to coils of the intermediate relays K1 and K2, one group of normally-open contacts of the intermediate relay K2 are connected to the input end of an alternating current contactor KM, the other group of normally-open contacts of the intermediate relay K2 and one group of normally-closed contacts of the intermediate relay K1 form a self-protection loop, the control end of the, other power supplies can be connected additionally.

Claims (1)

1. Double system secondary water supply equipment, frequency conversion control cabinet (1) including built-in PLC controller, install vacuum inhibitor's stationary flow jar (2), variable frequency speed control water pump unit (3) and pressure sensor, the water inlet and the water pipe network (7) of stationary flow jar are connected, its kneck is equipped with into water pressure sensor (4), the delivery port and the water inlet of variable frequency speed control water pump unit of stationary flow jar are connected, the delivery port and user pipe network (8) of variable frequency speed control water pump unit are connected, its kneck is equipped with out water pressure sensor (5), water sensor, it is connected with the frequency conversion control cabinet to go out water pressure sensor and variable frequency speed control water pump unit, its characterized in that: an electric contact pressure gauge (6) is installed at the joint of the water outlet of the variable-frequency speed-regulating water pump unit and a user pipe network, a relay and an alternating current contactor are installed in the variable-frequency control cabinet, and the electric contact pressure gauge, the relay, the alternating current contactor, the variable-frequency speed-regulating water pump unit and a power supply are connected through wires.

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