CN201255461Y

CN201255461Y - Device of hot water heat supply air conditioner for preventing heater from freezing by inlet of fresh air in cold area

Info

Publication number: CN201255461Y
Application number: CNU2008200721024U
Authority: CN
Inventors: 舒保中; 江萍
Original assignee: Individual
Current assignee: Individual
Priority date: 2008-07-09
Filing date: 2008-07-09
Publication date: 2009-06-10
Anticipated expiration: 2018-07-09

Abstract

The utility model relates to a device preventing a heater from being frozen when a heat supply air conditioner absorbing fresh air in cold region, which belongs to the technical field of the heat supply, and synchronically resolves the freezing prevention when blowing fresh air and the control protection of the air conditioner system under different work conditions, and overcomes the weaknesses of the prior freeze-preventing device that the equipment is complex and the security is poor. The device comprises an air flue, a heater and a blower. The device is characterized in that a hot-water supply backwater pipe is provided with a water pump and an electric adjusting valve, and a retaining valve is arranged between the backwater pipe and a water supply pipe, and a water supply temperature sensor, a backwater temperature sensor, a mixed-water backwater temperature sensor, a fresh-air temperature sensor, an air-ventilating temperature sensor and a controller PLC are arranged at the corresponding positions. The device has the advantages that a hot-water mixing system with fixed flow-rate is additionally provided, so that hot water that is cycled inside an air conditioner heater pipe bunch can maintain the adequate and fixed cycling quantity, thereby preventing the freezing of the heater. The device has simple structure and reliable running.

Description

Cold district hot water heating air-conditioning advances new wind and prevents the heater freezing plant

Technical field

The utility model belongs to the heat supply field, is specifically related to the hot water heating air-conditioning.

Background technology

Cold district is using a large amount of hot water circuit central heating air-conditioning systems, and majority all adopts the indoor circulation air at present.Time is long slightly, and air quality descends, and indoor environmental pollution is serious.Along with country, enterprise and employee to improving constantly that factory building or indoor environment require, the air-conditioning of factory building or workplace advances new wind has become the problem that must solve.Under the pressure of this trend, this kind of part air-conditioning has installed additional and has improved the new wind mechanism of advancing of IAQ.But, often run into the problem that fresh air conditioner heating tube into freezes because indoor/outdoor temperature-difference is big.In order to guarantee that heating system and equipment normally move, occurred with the natural gas preheated air, utilized method such as antifreeze medium 2 times circulation heating antifreeze, this has brought again that equipment becomes complicated, floor space increases, the having relatively high expectations of resource, investment and operating cost are improved problems such as poor stability.

Summary of the invention

The purpose of this utility model provides a kind of cold district hot water heating air-conditioning and advances new wind and prevent the heater freezing plant.Directly utilize the hot-water heating system resource of thermal source, ensure and regulator control system control by the thermodynamic cycle operating mode, solve the control protection under new wind and anti-freezing and the various operating modes of air-conditioning system synchronously, overcome equipment complexity, increase floor space, expense increase that existing anti-freeze device exists, problems such as poor stability.

Anti-freeze device of the present utility model includes the air channel of outdoor air inlet and air outlet, heater in the air channel, blower fan, the improvement of being done is on the heat supply water return pipe of heater water pump to be installed, after the return pipe charging pump, electric control valve is arranged, at water pump, between return pipe and the feed pipe check valve is arranged between the electric control valve, the supply water temperature sensor is arranged on the water supply water inlet pipe, the return water temperature sensor is arranged on the water supply return pipe, mixed water return water temperature sensor is arranged on the water return pipeline before water pump, new wind-warm syndrome degree sensor is arranged in the inlet side, air channel, the air-supply side has wind pushing temperature sensor in the air channel, and the relevant position is installed and connected sensor on device, the controller PLC of control water pump and control valve.

Good effect of the present utility model is: by adding the hot water hybrid system of firm discharge, guarantee that air-conditioning heater is under the temperature adjustment state of a control, hot water circuit in the air-conditioning heater tube bank keeps enough and fixed cycles amount, to the preheating section heater that advances new wind fix internal circulating load and fixedly temperature difference control adjust or design.Make the fixedly temperature drop pattern of the fixed cycles amount formation preheating section heater of its structure and circulation.The target temperature of air-conditioning is controlled by the hot water backwater's temperature before Programmable Logic Controller and the mixed water and the return water temperature after mixing water links controls.Be a kind of simple in structure, reduce investment outlay, energy savings and coordinate the regulation and control leaving air temp, reliable hot water heating air-conditioning advances new wind and prevents the heater freezing plant.

Description of drawings

Accompanying drawing is the utility model overall structure schematic diagram.

The specific embodiment

Consult accompanying drawing, in heater 3 one sides new wind inlet is arranged, opposite side has the interior blower fan 5 of installing of air-conditioning in the air channel 4 of new wind outlet, peace multifunctional pump 6 on the return pipe 2, peace electric control valve 7 on the return pipe after the multifunctional pump, at multifunctional pump, the check valve 8 that leads to feed pipe 1 is installed on the water return pipeline between the electric control valve, be installed in the supply water temperature sensor 9 on the feed pipe 1, be installed in the return water temperature sensor 10 on the return pipe 2 at control valve 7 rears, be installed in the mixed return water temperature sensor 11 on the water return pipeline of multifunctional pump the place ahead, be installed in the new wind-warm syndrome degree sensor 12 of inlet side, air channel, be installed in the wind pushing temperature sensor 13 and the controller 14 (PLC) of air channel air draft side, the line of each sensor of line and control valve and controller PLC promptly constitutes embodiment of the present utility model.

Running of the present utility model is:

(1) start: controller is opened certain aperture (as 80%) and delay time a period of time (as 200 seconds) with electric control valve after receiving and entering normal operation enabled instruction, treats that will not start automatically if blower fan starts time delay later.If blower fan starts, control system will detect the one's intention as revealed in what one says temperature automatically, mix parameters such as water return water temperature, heating return water temperature.

(2) normal operation: controller enters automatic control mode, various sensors is carried out data acquisition also controlled.If return water temperature too high (as 80 ℃), will turn down the aperture of electric control valve automatically, turn down (as 5%) by the mode of going forward one by one by a small margin; Be lower than " dangerous temperature " (as 30 ℃) if mix the water return water temperature, system will control and no longer turn down electric control valve, but open the aperture of big control valve, be not less than " dangerous temperature " until mixed water return water temperature; After satisfying above-mentioned control requirement, system will control wind pushing temperature (in 22 ℃ ± 1 ℃) automatically and adjust the control electric control valve, realize the autobalance of system and realize wind-warm syndrome control.

(3) control during unusual condition: electric control valve has been opened more than 80%, multifunctional pump works well, but return water temperature low excessively (as less than 50 ℃), mixed water return water temperature low excessively (less than 30 ℃) should turn down new air-valve control cold blast rate, the internal circulating load of the indoor wind of corresponding increase simultaneously.Till system's return water temperature is higher than the qualification minimum temperature.Report to the police simultaneously.(2) supply water temperature is lower than a certain temperature (as 75 ℃), during supply backwater temperature difference excessive (as 〉=40 ℃), or during mixed water return water temperature low excessively (as being lower than 30 ℃), or wind pushing temperature is when continuing to be lower than rated temperature, electric control valve should continue to keep more than 80%, turn down fresh wind port simultaneously, open indoor circulation wind, prevent that frozen pipe from taking place.Be not higher than specified maximum temperature but still can control wind pushing temperature.When (3) multifunctional pump is out of service: the automatic stall of linkage fan, electric control valve stays open certain aperture (can be made as 5%～15%) simultaneously, prevents frozen pipe, and output alarm, treat that the maintenance personal repairs multifunctional pump, and water pump normally moves rear fan and could start.

(4) shut down condition: the out-of-blast pattern of dactylus holiday, the intermitten service of short time at night.Blower fan is out of service under the stoppage in transit pattern; The aperture of electric control valve is no longer regulated and control by wind pushing temperature, and by heating return water temperature and the control of mixed water return water temperature.After entering the stoppage in transit pattern, system will guarantee the multifunctional pump running, and according to the aperture of mixing water return water temperature and heating return water temperature control electric control valve.A: return water temperature then turns down the motorized adjustment valve opening too high if (as being higher than 80 ℃), until close or 5% aperture till, not exclusively close, anti-locking system freezes, and opens after convenient.B: if mix water return water temperature low excessively (as being lower than 30 ℃), then open big motorized adjustment valve opening, coil pipe does not freeze when guaranteeing to stop transport, and saves heat energy.

Claims

1, cold district hot water heating air-conditioning advances new wind and prevents the heater freezing plant, include the air channel of outdoor air inlet and air outlet, heater in the air channel, blower fan, it is characterized in that: on the heat supply water return pipe of heater, water pump is installed, after the return pipe charging pump, electric control valve is arranged, at water pump, between return pipe and the feed pipe check valve is arranged between the electric control valve, the supply water temperature sensor is arranged on the water supply water inlet pipe, the return water temperature sensor is arranged on the water supply return pipe, mixed water return water temperature sensor is arranged on the water return pipeline before water pump, new wind-warm syndrome degree sensor is arranged in the inlet side, air channel, the air-supply side has wind pushing temperature sensor in the air channel, and arbitrary position is installed and connected sensor on device, the controller PLC of control water pump and control valve.