CN203385087U

CN203385087U - Distributed frequency converting control system

Info

Publication number: CN203385087U
Application number: CN201320393621.1U
Authority: CN
Inventors: 吴海城; 孙志诚
Original assignee: Beijing Shuai An Energy-Saving Equipment Co Ltd
Current assignee: Beijing Shuai An Energy-Saving Equipment Co Ltd
Priority date: 2013-07-04
Filing date: 2013-07-04
Publication date: 2014-01-08
Anticipated expiration: 2023-07-04

Abstract

The utility model aims at providing a distributed frequency converting control system. The distributed frequency converting control system can intelligently control the flow volume of a primary network inlet heat exchanger according to the heat exchanging power of every heat exchange station to obtain energy-saving type heat exchange stations or heat exchange units as required and a special control system required by the energy-saving type heat exchange stations or heat exchange units. The distributed frequency converting control system is composed of a cabinet and a control panel and is characterized in that the surface board 3 of the cabinet 1 is provided with a touch screen 2, a cabinet operation power indicator lamp 4 and a fault indicator lamp 5; a power inlet 7 is arranged at the top left corner of the bottom surface of the cabinet, and a strip control interface 6 is arranged on the right of the power inlet; a PLC (programmable logic controller) 10, an analog quantity signal module 8, a digital quantity signal module and a 485 communication module 10 are mounted inside the cabinet. According to the distributed frequency converting control system, a distributed frequency converting water pump is additionally mounted on a water return pipe of every heat exchange station, so that the heat exchange station can exchange heat as required according to outdoor temperature change, quantity adjustment can be achieved through a distributed frequency converting water pump water pumping mode and further the object of 10% heat energy saving can be achieved; meanwhile, the lift of a primary network main circulation pump can be reduced, so that a main circulation pump can be replaced with a high-flow low-lift pump and further 30% electricity saving can be obtained.

Description

Distributed frequency-changing control system

Technical field:

The utility model relates to that a kind of to take energy-conservation be purpose, and particularly in the central heating system of city, energy-saving heat exchange station (unit) is especially measured and regulated heat exchange station (unit) and realize energy-conservation control system.

Background technology:

Heat exchange station is to realize the important step that the thermal source of the heating plant of concentrated supply of heating in the city generation is carried to user's (secondary net), and it carries heat energy by user's that each heat exchange station supplies needs.Traditional heating network circulating pump arrangement is for arranging the one-level circulating pump at the thermal source place, be responsible for the operation of whole heat supply network, its shortcoming is: when the one-level circulating pump system is set, in the type selecting of circulating pump, lift is to select according to the distal-most end heat exchange station, circulating pump has 30% above power consumption to be wasted in to overcome on lift, cause very large waste of energy, this also causes the hot user of near-end that too much available pressure head is arranged simultaneously, in the situation that regulating measure is not in place, this near-end flow exceeds standard and must bring again the far-end underfed, hydraulic misadjustment is serious, the final heating system phenomenon uneven in temperature that forms.

Summary of the invention:

The purpose of this utility model is to provide a kind of distributed frequency-changing control system, can enter the special control system that the heat exchanger flow size needs with the energy-saving heat exchange station of realizing heat exchange requirement as required or unit and energy-saving heat exchange station or unit according to each heat exchange station heat exchange watt level Based Intelligent Control one secondary net.

This distributed frequency-changing control system is comprised of cabinet, touch-screen and controller PLC, it is characterized in that: on the panel 3 of cabinet 1, be provided with touch-screen 2, cabinet operation power supply indication etc. 4 is arranged above it, malfunction indicator lamp 5, power import 7 is in the cabinet downside upper left corner, the right one row, for control interface 6, is equipped with controller PLC10, analog signals module 8, digital quantity signal module 9 and 485 communication modules 10 in cabinet.

Above-mentioned touch-screen is arranged in cabinet 1, and its electric composition comprises civil power 220V and export the 24V constant voltage dc source after the Switching Power Supply rectification, supplies with respectively controller PLC10, touch-screen 9; Temperature signal, pressure signal, flow signal, a secondary net distributed water pump, secondary network circulating pump, small pump frequency conversion frequency input/output signal are connected on the input and output control interface of collection of simulant signal module 8; The input and output control interface of the start stop signal access number signal acquisition module 9 of one secondary net distributed water pump, secondary network circulating pump, small pump.Above-mentioned various analog signals, digital quantity signal upload on touch-screen 2 and are shown through microprocessor PLC10, and can carry out setting parameter by touch-screen 2.

Above described control interface comprise the outdoor temperature signal, one secondary net supply water temperature signal, one secondary net return water temperature signal, one secondary net pressure of supply water signal, one secondary net pressure of return water signal, one secondary net flow signal, one secondary net distributed water pump frequency conversion frequency signal, secondary network supply water temperature signal, secondary network return water temperature signal, secondary network pressure of supply water signal, secondary network pressure of return water signal, the secondary network flow signal, secondary network circulating pump frequency conversion frequency signal, secondary network small pump frequency conversion frequency signal.

The beneficial effect that the utility model reaches:

1, be controlled at by distributed frequency-changing control system the distributed variable frequency pump installed additional on heat exchange station primary water pipe, realize that heat exchange station can change heat exchange as required according to outdoor temperature, the mode realization amount of drawing water by distributed variable frequency pump is regulated, reach saving heat energy 10% target, alleviate host's circulating pump lift one time simultaneously, main circulation pump can be replaced by large flowrate low head pump, can realize economize on electricity 30%.

2, control the frequency of the circulating pump of heat exchange station secondary network by distributed frequency-changing control system, calculate secondary network by collection poor for pressure of return water, automatically realize the differential pressure VFC of circulating pump, reach energy conservation object.

3, control the frequency of the small pump of heat exchange station secondary network by distributed frequency-changing control system, by gathering secondary network pressure of supply water signal, automatic secondary net constant pressure making up water VFC, reach energy conservation object.

4, sensor, frequency converter frequency feedback connection, realize automatic fault diagnosis, and sound and light alarm, is convenient to timely queueing problem

5, the temperature signal gathered by distributed frequency-changing control system, pressure signal, flow signal, the distributed variable frequency pump of heat exchange station one secondary net of control, the circulating pump of secondary network, the small pump of secondary network, can easily realize the remote monitoring of heat exchange station by 485 communication ports of system.

The accompanying drawing explanation:

The contour structures schematic diagram that Fig. 1 is distributed frequency-changing control system;

Fig. 2 is the use reference diagram of Fig. 1 in heat exchange station;

The electrical schematic diagram that Fig. 3 is Fig. 1;

The control flow chart that Fig. 4 is Fig. 1.

1. cabinets in figure, 2. control panel (FBS-CCU), 3. cabinet panel, 4. indicating fault etc., 5. power supply indicator, 6. control interface, 7. power interface, 8. analog signals module, 9. digital quantity signal module, 10.PLC controller, 11.485 communication module, T0. outdoor temperature sensor, T11. a secondary net supply water temperature sensor, T12. a secondary net return water temperature sensor, P11. a secondary net pressure of supply water sensor, P12. a secondary net pressure of return water sensor, N1. a secondary net flowmeter, B1. the distributed variable frequency pump of a secondary net, T21. secondary network supply water temperature sensor, T22. secondary network return water temperature sensor, P21. secondary network pressure of supply water sensor, T22. secondary network pressure of return water sensor, N2. secondary network flowmeter, B2. secondary network frequency variable circulating pump, B3. secondary network frequency conversion small pump, H. heat exchanger.

The specific embodiment

The utility model is comprised of five parts, liquid crystal touch screen (2), controller PLC (10), analog signals module (8), digital quantity signal module (9) and 485 communication modules (11).

The utility model is after beginning is enabled in energising, controller PLC (10) first initializes, then analog signals module (8) initializes, digital quantity signal module (9) initializes, membrane keyboard keyboard by liquid crystal touch screen (2) arranges running parameter, reexamine the signal gathered by analog signals module (8), digital quantity signal module (9), undesired returning, normally proceed the operation of control program.Control to gather by liquid crystal touch screen (2) and show, to controlled equipment, function and pid control algorithm computing are controlled in compensation by control software of the present utility model, by by analog signals module (8) and the parameter comparison that arranges by touch-screen (2), the frequency of when correct, by PD algorithm regulative mode, regulating the distributed variable frequency pump of a controlled secondary net, the circulating pump frequency conversion frequency of secondary network, the small pump frequency conversion frequency of secondary network, by analog signals module (8) output control signal, when incorrect, by pid algorithm, regulate, by analog signals module (8) output control signal, reach to regulate and control each equipment in rational running status.

Realize the distributed variable frequency pump start and stop of a secondary net, the circulating pump of secondary network and the small pump start and stop of secondary network by digital quantity signal module (9) and touch-screen (2) by control software of the present utility model, allow controlled device reach and regulate each equipment of control in rational running status.

Claims

1. a distributed frequency-changing control system, by cabinet and control panel, formed, it is characterized in that: on the cabinet panel (3) of cabinet (1), be provided with touch-screen (2), cabinet operation power supply indicator (5) is arranged above cabinet panel (3), there is equipment operation failure indicator lamp (4) on the right side, power import (7) is in the cabinet downside upper left corner, and the right one row is control interface (6).

2. according to the described distributed frequency-changing control system of claim (1), it is characterized in that: described controller PLC (10), analog signals module (8), digital quantity signal module (9), 485 communication modules (11) are arranged in cabinet (1), electric composition comprises that civil power 220V is through the Switching Power Supply step-down, the constant voltage dc source of output 24V after rectification, supply with respectively touch-screen (2), controller PLC (10), temperature signal, flow signal, pressure signal, frequency variation signal and feedback signal are connected on the input of analog signals module (8), output, the distributed variable frequency pump of one secondary net, the secondary network circulating pump, the start stop signal of small pump is connected on the input of digital quantity signal module (9), output.

3. distributed frequency-changing control system according to claim 1 is characterized in that: described control interface comprises temperature signal, pressure signal, frequency variation signal and feedback signal input interface and controls output interface; The temperature signal input interface comprises outdoor temperature, a secondary net supply and return water temperature, secondary network supply and return water temperature; The flow signal input interface comprises a secondary net flow meter signal, secondary network flow meter signal; The pressure signal input interface comprises that a secondary net supplies pressure of return water for pressure of return water, secondary network; Frequency variation signal input, feedback interface comprise the distributed variable frequency pump frequency conversion of secondary net frequency, secondary network circulating pump frequency conversion frequency, secondary network small pump frequency conversion frequency signal.