CN207584922U - A kind of energy-saving type frequency conversion fan coil - Google Patents

Abstract

The utility model proposes a kind of energy-saving type frequency conversion fan coils, solves the step speed regulation that common fan coil can only carry out high, medium and low third gear, the problem of energy-saving effect is bad, including air-conditioning box, the air-conditioning box is equipped with to the air outlet of indoor blowing and indoor wind is returned to the return air inlet in the air-conditioning box；Chilled water coil in the air-conditioning box, the chilled water coil both ends have been respectively communicated with water inlet pipe and outlet pipe；Air-intaking box at the return air inlet of the air-conditioning box, the air-intaking box is interior to be equipped with centrifugal blower, and the centrifugal blower is driven by direct current variable frequency motor and rotated；DC frequency conversion controller be electrically connected in the air-conditioning box, with the direct current variable frequency motor, the control centrifugal blower velocity of rotation；And in the return air inlet of the air-conditioning box, for sense inlet air temperature signal and to the DC frequency conversion controller send out inductive signal instruction inlet air temperature sensor, reach the energy-saving effect more preferably purpose for making fan coil.

Description

An energy-saving frequency conversion fan coil unit

technical field

The utility model relates to the technical field of fan coils, in particular to an energy-saving frequency conversion fan coil.

Background technique

The fan coil unit is installed in buildings such as office buildings, hospitals, hotels, restaurants, etc., and uses the air-water heat exchange circulation system to process the air temperature, humidity and air quality in the room in a centralized manner, so as to meet the needs of people. The terminal treatment device of the central air-conditioning system required.

At present, the motors used in most fan coil units are single-phase AC asynchronous motors, which have defects such as low efficiency, high power consumption, high temperature, large vibration and noise, large volume, heavy weight, and many consumables. In particular, its speed regulation adopts the winding tap method, which can only carry out stepwise speed regulation of high, medium and low gears, which cannot achieve the best energy-saving effect.

Utility model content

The purpose of the utility model is to provide an energy-saving frequency conversion fan coil unit, which has the advantage of good energy-saving effect.

The above-mentioned technical purpose of the utility model is achieved through the following technical solutions: an energy-saving frequency conversion fan coil unit, comprising: an air-conditioning box, the air-conditioning box is provided with an air outlet for blowing indoors and returning indoor air to the The air return port in the air conditioning box; the cold water coil in the air conditioning box, the two ends of the cold water coil are respectively connected with the water inlet pipe and the water outlet pipe; the air return box in the air return port of the air conditioning box, the A centrifugal fan is arranged in the return air box, and the centrifugal fan is driven to rotate by a DC frequency conversion motor; a DC frequency conversion controller installed in the air conditioning box and electrically connected with the DC frequency conversion motor controls the rotation speed of the centrifugal fan and, an air inlet temperature sensor installed in the air return port of the air conditioning box for sensing the air inlet temperature signal and sending an induction signal to the DC frequency conversion controller.

By adopting the above-mentioned technical scheme, when the indoor load is constant, the amount of cold air that needs to be sent to the room is constant. Compared with the outdoor wind, the indoor air temperature is generally lower in summer. After a small amount of outdoor air is mixed, it is turned into cold air by the cooling effect of the cold water coil and sent into the room. Compared with using all outdoor air for cooling, it can save energy more effectively. The inlet air temperature sensor installed at the return air outlet is used to sense the inlet air temperature signal at the return air outlet, and sends an instruction of the inlet air temperature signal to the DC inverter controller, and the DC inverter controller compares the inlet air temperature signal with the indoor preset Compared with the temperature value, when the inlet air temperature signal indicates that the temperature exceeds the indoor preset temperature value by a large amount, the DC inverter controller controls the rotation speed of the DC inverter motor to increase, thereby increasing the return air volume of the centrifugal fan; when the inlet air temperature signal When the indicated temperature is close to the preset temperature value in the room, the DC frequency conversion controller controls the rotation speed of the DC frequency conversion motor to slow down, thereby reducing the size of the return air volume of the centrifugal fan; to achieve the purpose of controlling the return air volume of the centrifugal fan according to the indoor needs, which is different from that of common fans Compared with the fixed-value return air method of the centrifugal fan of the coil unit, the energy-saving effect is better.

According to a further setting of the utility model, the water inlet pipe is provided with a proportional regulating valve electrically connected to the DC frequency conversion controller and controlled by the DC frequency conversion controller to adjust the opening of the water inlet flow in the water inlet pipe.

By adopting the above technical solution, the inlet air temperature sensor transmits the sensed inlet air temperature signal at the return air outlet to the DC frequency conversion controller, and the DC frequency conversion controller compares the inlet air temperature signal with the preset temperature value in the room. When the air inlet temperature signal indicates that the temperature exceeds the preset indoor temperature by a large amount, the DC frequency conversion controller controls the proportional regulating valve to increase the opening of the water inlet pipe, thereby increasing the water inlet of the cold water coil and speeding up the return air of the cold water coil. Cooling effect; when the air inlet temperature signal indicates that the temperature is close to the preset temperature value in the room, the DC frequency conversion controller controls the proportional regulating valve to reduce the opening of the water inlet pipe, thereby reducing the water intake of the cold water coil and reducing the temperature of the cold water coil. Cooling effect on the return air; achieve the purpose of controlling the opening of the proportional control valve and adjusting the indoor temperature according to the needs of the room. Compared with the common way that the valve on the water inlet pipe of the fan coil unit can only be opened or closed, it is energy-saving. Better results.

According to a further setting of the present invention, the air inlet temperature sensor is a thermocouple temperature sensor.

By adopting the above technical scheme, the thermocouple temperature sensor uses the principle that the resistance value of a conductor or semiconductor changes with temperature to measure temperature, and has the advantages of stable performance, flexible use, and high reliability.

According to a further setting of the present invention, a pair of tube plates are arranged in the air-conditioning box respectively located on both sides of the air flow direction of the air outlet, and the cold water coil is serpentinely inserted between the two tube plates.

By adopting the above technical solution, the cold water coil is serpentinely arranged between the two tube plates, so that the contact area between the cold water coil and the return air is larger, and the cooling effect on the return air is also better.

According to a further setting of the utility model, the cold water coil is equipped with aluminum warping pieces densely arranged along the air exhaust direction.

By adopting the above technical solution, since the aluminum warp itself has good thermal conductivity, the aluminum warp on the cold water coil can further increase the contact area with the return air and the cooling effect.

In a further setting of the present utility model, the air outlet is provided with a grill installed on the air-conditioning box.

By adopting the above technical solution, the wind resistance of the grille is small, so that the ventilation at the air outlet is good; and the appearance is beautiful and the design standard gives people a modern feeling of overall smoothness.

In a further setting of the present invention, a filter screen is installed at the return air outlet of the return air box.

By adopting the above technical solution, the filter screen can absorb the dust in the return air and reduce the damage caused by the dust to the human body; at the same time, it can prevent the dust from entering the air-conditioning box and affect the rotation speed of the centrifugal fan and the cooling effect of the cold water coil.

According to a further setting of the present invention, a water receiving tray for receiving condensed water condensed on the cold water coil is arranged under the air conditioning box, and the water receiving tray is connected with a drain pipe.

By adopting the above technical solution, the condensed water generated during the cooling process of the cold water coil is collected on the water receiving tray and discharged through the drain pipe.

In summary, the utility model has the following beneficial effects:

First, install an air inlet temperature sensor at the air return port, the air inlet temperature sensor is used to sense the air inlet temperature signal at the air return port, and send an air inlet temperature signal instruction to the DC frequency conversion controller, and the DC frequency conversion controller will The air inlet temperature signal is compared with the indoor preset temperature value to control the rotation speed of the DC variable frequency motor, so as to achieve the purpose of controlling the return air volume of the centrifugal fan according to the indoor needs. Compared with the common fan coil unit, the energy saving effect is better;

Second, the proportional regulating valve is controlled by the DC frequency conversion controller to control the opening of the proportional regulating valve according to the needs of the indoor temperature, and the indoor temperature is adjusted, which is different from the way that the valve on the water inlet pipe of the common fan coil unit can only be opened or closed. In comparison, the energy saving effect is better.

Description of drawings

Fig. 1 is the overall structural representation of the utility model embodiment;

Fig. 2 is a schematic diagram of the structure of the upper part of the air-conditioning box of the fan coil unit in the embodiment of the utility model after being partially cut off.

Reference signs: 1. Air conditioning box; 2. Air outlet; 3. Return air outlet; 4. Cold water coil;

5. Return air box; 6. DC variable frequency motor; 7. DC variable frequency controller; 8. Inlet air temperature sensor; 9. Proportional regulating valve; 10. Tube plate; Net; 14, water tray; 15, drainage pipe.

Detailed ways

Below in conjunction with accompanying drawing, the utility model is described in further detail.

This specific embodiment is only an explanation of the utility model, and it is not a limitation of the utility model. After reading this description, those skilled in the art can make modifications to the embodiment without creative contribution according to needs, but as long as it is within the utility model All new claims are protected by patent law.

An energy-saving frequency conversion fan coil unit, as shown in Figure 1 and Figure 2, includes an air-conditioning box 1, a cold water coil 4 is installed in the air-conditioning box 1, and the two ends of the cold water coil 4 are respectively connected to the water inlet pipe and the water outlet pipe, The air conditioning box 1 is provided with an air outlet 2 and a return air outlet 3 located on opposite sides of the cold water coil 4 . When the indoor load is constant, the amount of cold air that needs to be sent to the room is constant. Compared with the outdoor wind, the indoor air is generally lower in summer temperature. Use the air return port 3 to return some indoor air to the air conditioning box 1 and mix it with a small amount of outdoor air. Finally, the cooling effect of the cold water coil 4 becomes cold air and then sent into the room. Compared with all cooling air with outdoor air, the energy-saving effect is better.

The return air outlet 3 of the air conditioning box 1 is provided with a return air box 5, and a centrifugal fan is arranged in the return air box 5, and the centrifugal fan is driven by a DC frequency conversion motor 6 to rotate, and the air conditioning box 1 is also provided with a motor that is electrically connected with the DC frequency conversion motor 6 and controls the centrifugal fan. The DC frequency conversion controller 7 of the fan rotation speed, the air inlet temperature sensor 8 for sensing the inlet air temperature signal and sending an induction signal to the DC frequency conversion controller 7 is installed at the air return port 3 of the air conditioning box 1 . The air inlet temperature sensor 8 sends the air inlet temperature signal sensed at the return air outlet 3 to the DC frequency conversion controller 7, and the DC frequency conversion controller 7 compares the air inlet temperature signal with the indoor preset temperature value, and when the air inlet temperature When the signal indicates that the temperature exceeds the indoor preset temperature value, the DC frequency conversion controller 7 controls the rotation speed of the DC frequency conversion motor 6 to increase to increase the return air volume of the centrifugal fan; when the air inlet temperature signal indicates that the temperature is close to the indoor preset temperature value , the DC frequency conversion controller 7 controls the rotation speed of the DC frequency conversion motor 6 to slow down, reducing the return air volume of the centrifugal fan; to achieve the purpose of controlling the return air volume of the centrifugal fan according to the indoor needs, which is different from the fixed value return air of the centrifugal fan of the common fan coil unit. Compared with the way, the energy saving effect is better.

The air inlet temperature sensor 8 is a thermocouple temperature sensor. The thermocouple temperature sensor uses the principle that the resistance value of a conductor or semiconductor changes with temperature to measure temperature, and has the advantages of stable performance, flexible use, and high reliability.

The air outlet 2 of the air-conditioning box 1 is provided with a grille 12, and the wind resistance of the grille 12 is small, so that the ventilation at the air outlet 2 is good; and the appearance is beautiful, and the design standard gives people a modern feeling of overall smoothness.

The return air outlet 3 of the air return box 5 is equipped with a filter screen 13, the filter screen 13 can absorb the dust in the return air, reduce the damage caused by the dust to the human body, and at the same time prevent the dust from entering the air conditioning box 1 and affect the rotation speed of the centrifugal fan And the cooling effect of the cold water coil 4.

The bottom of the air conditioning box 1 is provided with a water receiving tray 14 for receiving the condensed water condensed on the cold water coil 4 . up and out through drain 15.

A proportional regulating valve 9 electrically connected to the DC frequency conversion controller 7 is installed on the water inlet pipe. The proportional regulating valve 9 is controlled by the DC frequency conversion controller 7 to adjust the opening of the water inlet flow in the water inlet pipe. The air inlet temperature sensor 8 sends the air inlet temperature signal sensed at the return air outlet 3 to the DC frequency conversion controller 7, and the DC frequency conversion controller 7 compares the air inlet temperature signal with the indoor preset temperature value, and when the air inlet temperature When the signal indicates that the temperature exceeds the indoor preset temperature value by a large amount, the DC frequency conversion controller 7 controls the proportional regulating valve 9 to increase the opening of the water inlet pipe, increases the water intake of the cold water coil 4, and speeds up the cooling of the cold water coil 4 to the return air. Cooling effect; when the air inlet temperature signal indicates that the temperature is close to the preset temperature value in the room, the DC frequency conversion controller 7 controls the proportional regulating valve 9 to reduce the opening of the water inlet pipe, thereby reducing the water intake of the cold water coil 4 and reducing the cooling effect. The cooling effect of the cold water coil 4 on the return air; to achieve the purpose of controlling the opening of the proportional regulating valve 9 and adjusting the indoor temperature according to the needs of the room, which is different from the valve on the water inlet pipe of a common fan coil unit that can only be opened or closed Compared with other methods, the energy saving effect is better.

The air conditioning box 1 is fixed with a pair of tube plates 10 respectively located on both sides of the air outlet 2 in the flow direction of the airflow. The cold water coil 4 is serpentinely inserted between the two tube plates 10 . The contact area of the return air is larger, and the cooling effect on the return air is also better.

The cold water coil 4 is equipped with aluminum warps 11 densely arranged along the air exhaust direction. Since the aluminum warps 11 themselves have good thermal conductivity, the aluminum warps 11 on the cold water coil 4 can further increase the connection with the return air. Contact area and cooling effect.

Working process and principle: an air inlet temperature sensor 8 is installed at the air return port 3, and the air inlet temperature sensor 8 is used to sense the air inlet temperature signal at the air return port 3, and send an air inlet temperature signal indication to the DC frequency conversion controller 7 , the DC frequency conversion controller 7 compares the inlet air temperature signal with the indoor preset temperature value, and controls the rotation speed of the DC frequency conversion motor 6 and the opening of the proportional regulating valve 9, so as to control the return air volume and cold water according to the indoor needs. The cooling rate of the coil 4 is fast and slow and the purpose of adjusting the indoor temperature is better than that of the common fan coil.

Claims (8)

1. a kind of energy-saving type frequency conversion fan coil, which is characterized in that including：

Air-conditioning box (1), the air-conditioning box (1) return to the air-conditioning box equipped with the air outlet (2) to indoor blowing and by indoor wind (1) return air inlet (3) in；

Chilled water coil (4) in the air-conditioning box (1), chilled water coil (4) both ends have been respectively communicated with water inlet pipe and have gone out Water pipe；

Air-intaking box (5) at the return air inlet (3) of the air-conditioning box (1), the air-intaking box (5) is interior to be equipped with centrifugal blower, institute It states centrifugal blower and rotation is driven by direct current variable frequency motor (6)；

Be electrically connected in the air-conditioning box (1), with the direct current variable frequency motor (6), the control centrifugal blower rotation speed The DC frequency conversion controller (7) of degree；And

In the return air inlet (3) of the air-conditioning box (1), for sensing inlet air temperature signal and to the DC frequency-changing control Device (7) processed sends out the inlet air temperature sensor (8) of inductive signal instruction.

2. a kind of energy-saving type frequency conversion fan coil according to claim 1, which is characterized in that the water inlet pipe be equipped with The DC frequency conversion controller (7) electrical connection, by the DC frequency conversion controller (7) control to adjust in the water inlet pipe into The ratio adjusting valve (9) of water flow aperture.

A kind of 3. energy-saving type frequency conversion fan coil according to claim 2, which is characterized in that the inlet air temperature sensor (8) it is thermocouple temperature sensor.

4. a kind of energy-saving type frequency conversion fan coil according to claim 1, which is characterized in that set in the air-conditioning box (1) There is a pair of tube sheet (10) for being located at the air outlet (2) air current flow direction both sides respectively, the chilled water coil (4) is serpentine-like to wear Between two tube sheets (10).

5. a kind of energy-saving type frequency conversion fan coil according to claim 4, which is characterized in that on the chilled water coil (4) It is equipped with along the densely arranged aluminium fin (11) of air draft direction.

6. a kind of energy-saving type frequency conversion fan coil according to claim 1, which is characterized in that set at the air outlet (2) There is the grid (12) on the air-conditioning box (1).

7. a kind of energy-saving type frequency conversion fan coil according to claim 1, which is characterized in that the air-intaking box (5) is returned Filter screen (13) is installed at air port (3).

8. a kind of energy-saving type frequency conversion fan coil according to claim 1, which is characterized in that below the air-conditioning box (1) The drip tray (14) for accepting the condensed water condensed in the chilled water coil (4) is provided with, the drip tray (14) is communicated with Drainpipe (15).