Electricity-saving system of circulating pump in central air conditioner

Abstract

The invention discloses an electricity-saving system of a circulating pump in a central air conditioner, comprising a temperature-detecting device, a water return valve, a solenoid valve, a pressure gauge and a transducer; wherein, the temperature-detecting device is arranged at an air outlet of a central air-conditioning system; the water return valve is arranged on a return pipe of each fan coil; the opening of the water return valve is adjusted according to the data displayed on the temperature-detecting device so as to maintain the same temperature at the air outlet; the solenoid valve isarranged in the front of the water return valves in fan coils except two endmost fan coils and is used for ensuring that circulating water does not pass through fan coils when air conditioners are notused; the pressure gauge is arranged on an exhaust pipe of the circulating pump and the transducer is matched with the circulating pump; the pressure gauge transmits signals to the transducer; the transducer sends variable frequency signals to a power switch of the circulating pump to control the rotating speed of the circulating pump so as to maintain constant pressure difference between an inlet pipe and the return pipe of the fan coil. The electricity-saving system adopts variable frequency technology to control rise or drop of the rotating speed of the circulating pump so as to maintain constant pressure difference between the inlet pipe and the return pipe of the fan coil to reach the aim of electricity saving. The electricity-saving system is simple in structure, low in cost and convenient in installation, replacement and maintenance.

Description

(1) Technical field [0001] The invention relates to a central air-conditioning circulation pump power-saving system, which belongs to the technical field of central air-conditioning. (2) Background technology [0002] Central air-conditioning systems are generally used in institutions, schools, hospitals, shopping malls, hotels, guesthouses, factories, banks and other places. [0003] Figure 1 is a structural schematic diagram of the existing central air-conditioning fan coil unit, each fan coil unit is equipped with a water inlet valve 4 on the water inlet pipe 6, and its return water pipe 2 is only provided with a return water valve 3 and the return water valve 3 is Full open operation is not adjustable, so circulating water still passes through fan coil unit 1 when not in use. The circulating water power provided by the circulating pump of the above-mentioned structural design is generally to meet the needs of each fan coil unit, but usually the total supply power exceed...

AI Technical Summary

Problems solved by technology

The circulating water power provided by the circulating pump of the above-mentioned structural design is generally to meet the needs of each fan coil unit, but usually the total supply power exceeds the demand, so that part of the branch system and a single fan coil unit Excessive hot (cold) water flow, especially when not in use, the hot (cold) water inside is still flowing, forming idling, and the wasted electricity is even more alarming, because a part or a small part of the whole system is still In use, the heating (cold) water system is still running at full capacity

[0004] Among many units that use central air conditioning, there are partial (single) temporary non-use and random use. As for these fan coil units that are not used temporarily or part of the time, the cold or hot water inside is still running reactively. , and the operation of the circulating pump in the air conditioner room cannot reduce the operating power and waste a lot of electric energy

[0005] In order to overcome the shortcoming of the waste of electric energy caused by the idling of the circulating water pump, the invention patent No. 200820000606 of the State Intellectual Property Office discloses an automatic power-saving controller for a central air-conditioning circulating water device, including a control module containing a control software module and a display screen connected to it. There is also a temperature module and an analog module connected to the control module; the temperature module is connected with the temperature A2 measurement input port and the temperature B2 measurement input port, and the latter two are respectively connected with the measurement thermocouple of the water outlet of the chilled water and the outlet of the cooling water. The measurement thermocouple at the water outlet is connected; the analog module is connected to the pressure-measurement input terminal, and the pressure-measurement input terminal is connected to the pressure measuring device at the chilled water outlet; the control module is connected to the temperature difference A data output terminal, and the temperature difference A data output terminal is connected to the The temperature difference data input terminal of the chilled water pump control inverter is connected to

However, the node automatic controller of the above-mentioned mechanism adopts many control modules, the structure is complex, and the manufacturing and processing costs are high.

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