CN201463703U - A control device for central air-conditioning - Google Patents

Abstract

The utility model patent discloses a control device for central air-conditioning, which includes an air flow velocity sensor, an air temperature sensor, a fan frequency conversion motor, an air volume control device and a cooling water temperature sensor respectively connected to the air conditioning cooling tower energy-saving control center; the air flow velocity The sensor and the air temperature sensor are respectively located at the exhaust outlet on the top of the cooling tower, and the frequency conversion motor of the fan is located at the top of the cooling tower; the cooling water temperature sensor is located at the return water pan at the bottom of the cooling tower to collect the cooling water temperature data at the return water pan; the stepper motor Through the meshing of the motor gear and the ring gear, the self and the regulating damper are driven to move left and right along the damper guide rail in the air guiding volute housing, and the opening size of the regulating damper to the regulating tuyere is controlled. The utility model intelligently controls the cooling capacity exchange of the cooling tower of the central air conditioner to ensure that the cooling tower is in the best operating state. At the same time, because the recovered air-conditioning exhaust air is lower than the atmospheric temperature, the heat recovery efficiency of the central air-conditioning is higher, and the energy-saving advantage is obvious.

Description

A control device for central air-conditioning

technical field

The utility model relates to an air conditioner control device, in particular to a control device for a central air conditioner.

Background technique

The cooling tower of the traditional central air conditioner uses ambient fresh air (hot air) to cool the cooling hot water from the condenser (the cooled cooling water returns to the condenser to cool the refrigerant), the cooling efficiency is low, and the fan consumes a lot of energy. In order to ensure the fresh air in the air-conditioned space, the central air-conditioning has to set up an independent exhaust system for air-conditioning exhaust to ventilate the air-conditioned space. The temperature of the exhaust air of the air conditioner is much lower than the atmospheric temperature, and direct discharge to the atmosphere is a great loss of energy. Even if the existing heat recovery wheel processing device is used for energy recovery, the final exhaust air temperature is still much lower than the atmospheric temperature. If the exhaust air of this air conditioner is guided to be used in the cooling tower of the traditional central air conditioner, the central air conditioner will realize new energy saving.

Utility model content

The purpose of this utility model is to overcome the shortcomings in the above-mentioned prior art, and provide a control device for a central air conditioner that can improve the cooling effect by recovering the cooling capacity of exhaust air.

The utility model purpose is realized through the following technical solutions:

A control device for central air-conditioning, comprising an air velocity sensor, an air temperature sensor, an air-conditioning cooling tower energy-saving control center, a fan frequency conversion motor, an air volume control device, and a cooling water temperature sensor; the air-conditioning cooling tower energy-saving control center includes an MCS-51 single-chip microcomputer The air velocity sensor and the air temperature sensor are respectively located at the exhaust outlet on the top of the cooling tower, and are used to collect the flow velocity and temperature data of the exhaust at the outlet respectively; the fan frequency conversion motor is located on the top of the cooling tower, connected with the fan, and controls the fan speed; the cooling water The temperature sensor is located at the return pan at the bottom of the cooling tower to collect cooling water temperature data at the return pan;

The air volume control device is set on the air guiding volute shell of the central air conditioner, including the ring gear, motor gear, stepping motor, air guiding groove, adjusting air outlet, adjusting damper, damper guide rail and air inlet; the air guiding volute shell is cylindrical The shell encloses the air inlet position of the existing central air-conditioning cooling tower; the air guide volute shell is provided with an air guide groove, and the air guide groove is a rectangular groove embedded in the air guide vortex shell that spirals up; the air inlet It is located at the port of the air guiding groove; the regulating air port is an opening on the surface of the air guiding volute shell, and the regulating air door is a movable door that can close the regulating air port; the damper guide rail is a sliding guide rail fixed on the outer surface of the air guiding volute shell, and the damper guide rail supports and guides The adjusting damper reciprocates along the direction of the guide rail; the stepping motor is fixed on the adjusting damper; the ring gear is fixed on the upper edge of the air guide volute housing; the stepping motor is connected to the motor gear through the output shaft, and the motor gear meshes with the ring gear;

The air velocity sensor, air temperature sensor, fan variable frequency motor, stepping motor and cooling water temperature sensor are connected to the energy-saving control center of the air conditioning cooling tower through sensing wires; the stepping motor drives itself and the damper through the meshing of the motor gear and the ring gear. Move left and right on the air guide volute along the damper guide rail to control the opening size of the regulating damper to the regulating tuyere.

The air temperature sensor and the cooling water temperature sensor are thermocouple temperature sensors.

The air velocity sensor is a volume flow sensor.

Compared with the prior art, the utility model has the following advantages and beneficial effects:

The utility model uses the heat recovery wheel processing device to perform energy recovery on the exhaust air of the air conditioner (or energy recovery in other ways, or energy recovery has not been performed), and guides the exhaust air of the air conditioner to be used for cooling of the traditional central air conditioner. Tower, more effective secondary energy recovery for air-conditioning exhaust. The temperature of the exhaust air of the air conditioner is much lower than the atmospheric temperature. Even after the heat recovery wheel and other processing devices perform energy recovery on the exhaust air of the air conditioner, the temperature of the exhaust air of the air conditioner is still lower than the atmospheric temperature. During the secondary energy recovery, the cooling air volume of the cooling tower can be adjusted and controlled: the air guiding volute housing 9 of the new cooling tower (that is, the air inlet structure of the original cooling tower) is sealed, and the air guiding volute housing 9 is sealed. There is an adjustable damper, when the recovered air-conditioning exhaust air is enough for the cooling tower to exchange cooling capacity, the adjustable damper is fully closed; when the recovered cooling air volume is insufficient, the cooling tower energy-saving control center (ECU) according to the air velocity sensor, air temperature sensor Analyze the signal from the cooling water temperature sensor, so as to increase the fan speed and open the damper through the fan frequency conversion motor and stepper motor to meet the cooling capacity exchange needs of the cooling tower. Therefore, the utility model can intelligently control the cooling capacity exchange of the cooling tower of the central air conditioner, so as to ensure that the cooling tower is in the best operating state. At the same time, because the recovered air-conditioning exhaust air is lower than the atmospheric temperature, the heat recovery efficiency of the central air-conditioning is higher, and the energy-saving advantage is more obvious.

Description of drawings

Fig. 1 is a schematic structural diagram of a control device for a central air conditioner.

Figure 2 is a schematic diagram of the energy-saving control center of the air-conditioning cooling tower.

Fig. 3 is a block diagram of the control flow of the control device for the central air conditioner.

Fig. 4 is a schematic structural diagram of the air volume control device.

Detailed ways

The utility model will be further described below in conjunction with the accompanying drawings and the embodiments, but the protection scope of the utility model is not limited to the range described in the embodiments.

As shown in Figures 1 and 2, the central air conditioner includes a primary heat recovery runner processing device 1, an air supply pipe 2, an air conditioning cooling tower energy-saving control center (ECU) 3, an air conditioning cooling tower 4, an air volume control device 5, and an air guide vortex shell9. After the indoor return air (exhaust air) and outdoor fresh air undergo a heat recovery process at the heat recovery wheel processing device 1, the exhaust air (the temperature is still much lower than the atmospheric temperature) is discharged from the outdoor exhaust port, and is discharged by the air supply pipe. 2 Guided to the cooling tower 4 of the central air conditioner, under the guidance of the air guide shell 6 air guide groove, enter the cooling tower from the circumferential direction of the air conditioner cooling tower, and perform more effective cooling treatment on the cooling water. When the exhaust air volume entering the air conditioner is insufficient, the air conditioning cooling tower energy-saving control center (ECU) controls the air volume control device 5 to allow the air outside the air diversion vortex housing 9 to enter from the adjustment air port to supplement the cooling air volume. The action of the air volume control device 5 is controlled by the air-conditioning cooling tower energy-saving control center 3; since the exhaust air temperature is lower than the atmospheric temperature, the cooling effect of the air-conditioning cooling tower is greatly enhanced, and the cooling water temperature is reduced to significantly increase the cooling capacity; or reduce The speed of the cooling tower fan can thus significantly save electricity.

The heat recovery wheel treatment device 1 includes exhaust fan, fresh air filter, return air air filter, total heat recovery wheel, air conditioning cooling coil and blower. The total heat recovery wheel is located in the middle of the heat recovery wheel treatment device 1 The fresh air filter and exhaust fan are on one side of the total heat recovery rotor, and the return air filter, air conditioning cooling coil and supply fan are located on the other side of the total heat recovery rotor. The fresh air filter, exhaust fan, air conditioner cooling coil and return air filter are connected; the air conditioner cooling coil is connected to the supply fan. The total heat recovery rotor is preferably a rotor heat exchange produced by Seibu Giken or Klingenburg, Germany The outdoor fresh air is filtered by the fresh air filter and sent to the full heat recovery runner through the pipeline to cool down, and then the cooled air is cooled again by the air conditioning cooling coil to meet the requirements of the air conditioning project, and then sent to the blower through the pipeline , sent into the room from the supply fan; the indoor return air (exhaust air) of the air-conditioned room is filtered through the return air filter and then sent to the full heat recovery runner through the pipeline for heat recovery treatment, and the exhaust air after treatment enters the exhaust fan through the pipeline , is exhausted by the exhaust fan to the air supply pipe 2, and then sent to the air conditioning cooling tower to exchange cooling capacity with the cooling water to achieve the purpose of energy saving.

A control device for a central air conditioner of the utility model includes an air velocity sensor 21, an air temperature sensor 22, an air conditioning cooling tower energy-saving control center 3, a fan frequency conversion motor 15, an air volume control device 5 and a cooling water temperature sensor 23. Air-conditioning cooling tower energy-saving control center 3 includes MCS-51 single-chip microcomputer, first digital-to-analog conversion module D/A1 and second digital-to-analog conversion D/A2; first digital-to-analog conversion module D/A1 and second digital-to-analog conversion D/A2 Connect with MCS-51 MCU signal respectively. The air velocity sensor 21 and the air temperature sensor 22 are located at the exhaust outlet of the cooling tower top respectively, and are respectively used to collect flow velocity and temperature data of the exhaust at the outlet; the fan variable frequency motor 15 is located at the top of the cooling tower, connected with the fan, and controls the fan speed; The cooling water temperature sensor 23 is located at the water return pan at the bottom of the cooling tower, and collects cooling water temperature data at the water return pan.

As shown in Figure 4, the air volume control device 5 is arranged on the air guide volute housing 9 of the central air conditioner, and includes a ring gear 11, a motor gear 12, a stepping motor 13, an air guide groove 6, an adjustment air outlet 7, an adjustment damper 10, Air door guide rail 14, and air inlet 8. The air guide volute housing 9 is a cylindrical housing, which encloses the air inlet position of the existing central air-conditioning cooling tower; the air guide vortex housing 9 is provided with an air guide groove 6, which is embedded in The spirally rising rectangular groove inside the volute body 9 is formed by internal stamping; the air inlet 8 is located at the port of the air guide groove 6, and the exhaust air of the air conditioner enters the air guide groove 6 from the air inlet 8 and spreads evenly under the guidance of the air guide groove 6 Perform cooling exchange. The regulating air port 7 is an opening on the surface of the air guiding volute housing 9, and the regulating air door 10 is a movable door that can close the regulating air port 7; And guide the adjustment damper 10 to reciprocate along the direction of the guide rail; the stepper motor 13 is fixed on the adjustment damper 10; the ring gear 11 is fixed on the upper edge of the wind guide volute housing 9; the stepper motor 13 is connected to the motor gear 12 through the output shaft connection, the motor gear 12 meshes with the ring gear 11; the air velocity sensor 21, the air temperature sensor 22, the air conditioning cooling tower energy-saving control center 3, the fan frequency conversion motor 15, the stepper motor 13 and the cooling water temperature sensor 23 through the sensing wire and the cooling water temperature sensor 23 respectively. Air-conditioning cooling tower energy-saving control center 3 connections. The stepper motor 13 drives itself and the damper 10 to move left and right along the damper guide rail 14 through the meshing of the motor gear 12 and the ring gear 11 to control the opening size of the damper 10 to the adjustment tuyere 7 .

The air temperature sensor 22 and the cooling water temperature sensor 23 are all thermocouple temperature sensors; the air velocity sensor 21 is a volume flow sensor; the flow velocity and the temperature signal of the cooling tower top exhaust gas collected by the air velocity sensor 21 and the air temperature sensor 22 and the cooling The cooling water temperature signals collected by the water temperature sensor 23 are respectively sent to the MCS-51 single-chip microcomputer through the sensing wires, and after being processed by the MCS-51 single-chip microcomputer, the stepping of the air flow control device 5 is instructed by the first digital-to-analog conversion module D/A1. The motor 13 adjusts the air flow, so that the damper 10 is opened or closed. Opening is to let the air outside the tower enter (the "air conditioning exhaust" flow in the cooling tower is not enough), and closing is to let the cooling tower only use "air conditioning exhaust". flow work), etc.; when the cooling effect of the cooling tower is too large, the cooling tower top fan motor 15 is commanded by the second digital-to-analog conversion module D/A2 to control the fan to reduce the speed and save electric energy. As shown in Figure 3, A is the air temperature sensor 22 The measured value is the exhaust air temperature of the cooling tower; B is the measured value of the temperature sensor 23, which is the cooling water return temperature; C is the measured value of the air velocity sensor 21, and the product of C and the outlet area is the exhaust air temperature of the cooling tower. Flow rate; A0 is the standard value of cooling tower outlet exhaust temperature, B0 is the standard value of cooling water inlet temperature, and the value of B0 is generally 32°C; C0 is the preset recovered air-conditioning exhaust air volume, and A0 and C0 are related to the cooling tower scale and The recovery air volume is related to the local climate and other conditions. The standard value range of A0 is 32°C to 37°C. (1) When the air flow rate is low, the air temperature is high, and the cooling water temperature is higher than the set value, that is, A>A0, B>B0 , when C<C0, it means that the exhaust air flow of the air conditioner in the cooling tower is insufficient, that is, the digital value of the P1 interface is increased by 1, that is, the stepper motor 13 is instructed to start, and the sliding door is opened to allow the air outside the tower to enter and increase the air volume; (2) Otherwise, let the sliding door close, and the cooling tower will only use the "air conditioning exhaust" in the tower to work. When the cooling water temperature is low and the air temperature is low, that is, B<B0, A<A0, the digital value of the P2 interface is reduced by 1. Command cooling tower fan motor 2 speed down (energy saving).

Claims (3)

1. A control device for central air-conditioning, characterized in that it comprises an air velocity sensor, an air temperature sensor, an air-conditioning cooling tower energy-saving control center, a fan variable frequency motor, an air volume control device and a cooling water temperature sensor; the air-conditioning cooling tower energy-saving control The center includes MCS-51 single-chip microcomputer; the air velocity sensor and the air temperature sensor are respectively located at the exhaust outlet on the top of the cooling tower, and are used to collect the flow velocity and temperature data of the exhaust at the outlet; the fan frequency conversion motor is located on the top of the cooling tower and connected to the fan. Control the fan speed; the cooling water temperature sensor is located at the return pan at the bottom of the cooling tower to collect the cooling water temperature data at the return pan; The air volume control device is set on the air guiding volute shell of the central air conditioner, including the ring gear, motor gear, stepping motor, air guiding groove, adjusting air outlet, adjusting damper, damper guide rail and air inlet; the air guiding volute shell is cylindrical The shell encloses the air inlet position of the existing central air-conditioning cooling tower; the air guide volute shell is provided with an air guide groove, and the air guide groove is a rectangular groove embedded in the air guide vortex shell that spirals up; the air inlet It is located at the port of the air guiding groove; the regulating air port is an opening on the surface of the air guiding volute shell, and the regulating air door is a movable door that can close the regulating air port; the damper guide rail is a sliding guide rail fixed on the outer surface of the air guiding volute shell, and the damper guide rail supports and guides The adjusting damper reciprocates along the direction of the guide rail; the stepping motor is fixed on the adjusting damper; the ring gear is fixed on the upper edge of the air guide volute housing; the stepping motor is connected to the motor gear through the output shaft, and the motor gear meshes with the ring gear; The air velocity sensor, air temperature sensor, fan variable frequency motor, stepping motor and cooling water temperature sensor are connected to the energy-saving control center of the air conditioning cooling tower through sensing wires; the stepping motor drives itself and the damper through the meshing of the motor gear and the ring gear. Move left and right on the air guide volute along the damper guide rail to control the opening size of the regulating damper to the regulating tuyere. 2. The control device for central air-conditioning according to claim 1, characterized in that said air temperature sensor and cooling water temperature sensor are thermocouple temperature sensors. 3. The control device for central air-conditioning according to claim 1, characterized in that said air flow velocity sensor is a volume flow sensor.

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