Self-cleaning method for fresh air dehumidification all-in-one machine

Abstract

The application discloses a fresh air dehumidification integrated machine self-cleaning method, the fresh air dehumidification integrated machine includes a total heat exchanger and a heat pump refrigerant system, the heat pump refrigerant system includes an exhaust heat exchanger, a first air inlet heat exchanger and a second air inlet heat exchanger; in response to the self-cleaning instruction for the fresh air dehumidification integrated machine, a continuous self-cleaning mode is entered, the self-cleaning mode includes at least one self-cleaning stage, each self-cleaning stage includes a pretreatment stage, an exhaust heat exchanger frosting stage, an exhaust heat exchanger defrosting-second air inlet heat exchanger frosting stage and a second air inlet heat exchanger defrosting stage in turn; the fresh air dehumidification integrated machine is compact in overall structure, small in size, convenient to install, high in energy utilization rate, through switching of different air conditioning modes, the exhaust heat exchanger and the second air inlet heat exchanger realize frosting-defrosting-high temperature three-stage processing, realize the double effects of self-cleaning and high-temperature sterilization, reduce the workload of cleaning the heat exchanger in factory after-sales maintenance, and are favorable to improving the cleaning efficiency.

Claims

1. A self-cleaning method for a fresh air dehumidifier integrated machine, characterized in that, The integrated fresh air dehumidifier includes: Total heat exchanger: It includes an outer shell and a heat exchange core, an exhaust fan and an air supply fan disposed in the outer shell. An outdoor air inlet, an outdoor air outlet, an indoor air supply outlet and an indoor return air outlet are formed on the outer shell. Heat pump refrigerant system: It includes a compressor, a four-way valve, an exhaust heat exchanger, a first inlet heat exchanger and a second inlet heat exchanger connected together by refrigerant pipelines; The exhaust heat exchanger is connected to one port of the four-way valve. The other end of the exhaust heat exchanger is connected to the first air inlet heat exchanger via a first refrigerant branch and to the second air inlet heat exchanger via a second refrigerant branch. The first air inlet heat exchanger and the second air inlet heat exchanger are connected via a third refrigerant branch, on which a second expansion valve is formed. The other end of the second air inlet heat exchanger is connected to the four-way valve. The self-cleaning method includes the following steps: In response to the self-cleaning command for the integrated fresh air dehumidifier, it enters continuous self-cleaning mode. The self-cleaning mode includes at least one self-cleaning phase, each of which sequentially includes a pre-treatment phase, an exhaust heat exchanger frosting phase, an exhaust heat exchanger defrosting-first inlet heat exchanger frosting phase, and a first inlet heat exchanger defrosting phase. During the pretreatment stage, the heat pump refrigerant system operates in refrigeration mode, while the total heat exchanger operates in internal and external circulation mode. During the frosting stage of the exhaust heat exchanger, the heat pump refrigerant system operates in heating mode, and the total heat exchanger operates in total heat mode or internal / external circulation mode. During the defrosting of the exhaust heat exchanger and the frosting of the first inlet heat exchanger, the heat pump refrigerant system operates in cooling mode, and the total heat exchanger operates in internal and external circulation mode; the refrigerant flows from the exhaust heat exchanger to the first inlet heat exchanger through the second expansion valve located on the third refrigerant branch. During the defrosting stage of the first air intake heat exchanger, the heat pump refrigerant system operates in heating mode, and the total heat exchanger operates in total heat mode or internal circulation / external circulation mode. When the integrated fresh air dehumidifier enters the self-cleaning mode, it obtains the outdoor ambient temperature, indoor CO2 concentration and outdoor PM2.5 concentration, and determines whether the total heat exchanger will start in full heat mode or internal circulation mode during the defrosting stage of the exhaust heat exchanger and the defrosting stage of the first air inlet heat exchanger, based on the outdoor ambient temperature, indoor CO2 concentration and outdoor PM2.5 concentration. During the pretreatment stage, the supply fan is stopped, and the exhaust fan runs at the first target speed. During the frosting stage of the exhaust heat exchanger, both the supply fan and the exhaust fan operate at the first target speed. During the defrosting of the exhaust heat exchanger and the frosting stage of the first inlet heat exchanger, the supply fan is stopped and the exhaust fan runs at the first target speed. During the defrosting stage of the first air inlet heat exchanger, both the supply air fan and the exhaust air fan operate at the first target speed.

2. The self-cleaning method for a fresh air dehumidifier integrated unit according to claim 1, characterized in that, When the outdoor ambient temperature is greater than the preset temperature threshold, the total heat exchanger starts the internal and external circulation mode during the frosting stage of the exhaust heat exchanger and the defrosting stage of the first air inlet heat exchanger. When the outdoor ambient temperature is not greater than a preset temperature threshold, the indoor CO2 concentration is determined: When the indoor CO2 concentration is greater than the CO2 concentration threshold, the total heat exchanger enters the total heat mode. When the indoor CO2 concentration is not greater than the CO2 concentration threshold, the outdoor PM2.5 concentration is determined: When the outdoor PM2.5 concentration exceeds the PM2.5 concentration threshold, the total heat exchanger enters the internal circulation and external circulation mode. When the outdoor PM2.5 concentration is not greater than the PM2.5 concentration threshold, the total heat exchanger enters the total heat mode.

3. The self-cleaning method for a fresh air dehumidifier integrated unit according to claim 1, characterized in that, The four-way valve includes an input port, a return port, a first port, and a second port; The compressor's refrigerant outlet is connected to the input port, the return port is connected to the compressor's refrigerant return port, the first port is connected to the exhaust heat exchanger, the other end of the first intake heat exchanger is connected to the second port of the four-way valve, a one-way valve and a control valve are provided on the first refrigerant branch, and a first expansion valve is formed on the second refrigerant branch.

4. The self-cleaning method for a fresh air dehumidifier integrated unit according to claim 1, characterized in that, An air intake channel is formed between the outdoor air inlet and the indoor air outlet for supplying fresh outdoor air, and an exhaust channel is formed between the indoor return air outlet and the outdoor exhaust air outlet for supplying stale indoor air; the exhaust heat exchanger is disposed in the exhaust channel, and the first air intake heat exchanger and the second air intake heat exchanger are sequentially formed in the air intake channel along the airflow direction.

5. The self-cleaning method for a fresh air dehumidifier integrated unit according to claim 3, characterized in that, The first expansion valve and the second expansion valve are respectively connected to filters on both sides. The first refrigerant branch is connected to the third refrigerant branch. The one-way valve is used to control the flow of refrigerant from the exhaust heat exchanger through the second expansion valve to the first inlet heat exchanger.

6. The self-cleaning method for a fresh air dehumidifier integrated unit according to claim 1, characterized in that, An installation cavity is formed within the outer casing. The installation cavity includes an outdoor air intake area connected to the outdoor air inlet, an outdoor air exhaust area connected to the outdoor air outlet, an indoor air supply area connected to the indoor air supply outlet, and an indoor air return area connected to the indoor return air outlet. The air supply fan is located in the indoor air supply area, and the exhaust fan is located in the outdoor air exhaust area. An air intake volume regulating device is provided in the outdoor air intake area, and an exhaust volume regulating device is provided in the indoor air return area. Both the air intake volume regulating device and the exhaust volume regulating device include a valve body shell, a valve port formed on the side wall of the valve body shell, and a baffle plate rotatably connected to the valve port. The baffle plate is externally connected to a driving component for driving the baffle plate to control the opening and closing state of the valve port.

7. The self-cleaning method for a fresh air dehumidifier integrated unit according to claim 6, characterized in that, The baffle plate is also used to cut off the gas flow path between the outdoor air inlet or the indoor air return inlet and the heat exchange core when the valve is fully opened; In the total heat exchanger in total heat mode, the air intake volume regulating device and the baffle in the indoor return air zone respectively open the gas flow path between the outdoor air inlet, the indoor return air inlet and the heat exchange core. In the internal and external circulation mode of the total heat exchanger, the air intake volume regulating device and the baffle in the indoor return air zone respectively cut off the gas flow path between the outdoor air inlet, the indoor return air inlet and the heat exchange core.

8. The self-cleaning method for a fresh air dehumidifier integrated unit according to claim 6, characterized in that, The air intake volume regulating device and the air exhaust volume regulating device are also equipped with a purification component. The purification component includes a support member that can be detachably installed in the valve body housing and a filter element that is arranged at an angle in the support member. A limiting part for positioning the filter element is formed in the support member. The support includes a support bottom surface and support sidewalls located on both sides of the support bottom surface. The filter includes an air inlet end face and an air outlet end face. The air inlet end face is parallel to the air outlet end face, and the angle between the air inlet end face and the support bottom surface is 30 degrees to 80 degrees. The limiting portion includes limiting ribs formed on the side wall of the support member and extending into the inner cavity of the support member, and the inclination angle of each limiting rib is adapted to the inclination angle of the filter member.

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