Air treatment system applying ultrasonic humidification and control method thereof

Abstract

The invention discloses an air treatment system applying ultrasonic humidification and a control method thereof, and the air treatment system comprises a suction electric heater and a blow-out electric heater which are used for heating return air; the evaporator is used for refrigerating and dehumidifying return air; the fan is used for driving return air; the ultrasonic humidifier is used for vaporizing water molecules to generate water vapor to humidify return air; the electric humidifying equipment is used for humidifying the return air through steam generated by electric heating; return air is heated through the suction electric heater and the blow-out electric heater under the driving of the fan, is refrigerated and dehumidified through the evaporator, and is humidified through the electric humidifying equipment or the ultrasonic humidifier, so that supplied air with dry and wet bulb temperature meeting the test requirement is blown into the environment test room. Reasonable utilization of ultrasonic humidification and electric humidification of the air-conditioning laboratory can be achieved, the reliability of the ultrasonic humidification using process is improved, and the operation energy consumption of the air-conditioning laboratory is reduced.

Description

Technical Field

[0001] The invention relates to an air processing system using ultrasonic humidification, and also relates to a control method of the air processing system. Background Art

[0002] High-precision environmental test rooms need to maintain stable dry-bulb and wet-bulb temperatures. When the machine under test releases heat, in order to maintain the room temperature, the laboratory equipment needs to provide corresponding cooling capacity to offset this part of the heat. Currently, all test rooms use refrigeration units to provide cooling capacity. However, refrigeration units also dehumidify while cooling, and the higher the relative humidity in the room, the greater the dehumidification capacity. At this time, the laboratory equipment needs to be humidified. The humidity removed by the refrigeration machine is additional. Conventional test rooms use electric heating water to generate steam humidification for humidification. At this time, the cooling capacity used by the refrigeration machine for dehumidification is equal to the power consumption of electric humidification, which is not energy-saving.

[0003] The use of ultrasonic humidification can significantly reduce the energy consumption of the laboratory. Most of the heat of ultrasonic humidification comes from the heat released by the machine under test. At the same time, the amount of cooling required by the refrigeration machine is also reduced, that is, the power consumption of the refrigeration unit is reduced, and the power consumption of humidification is also reduced, achieving energy-saving operation. At the same time, according to the test conditions in Table 2 of GB / T 7725-2022, when the laboratory is in a low-temperature environment, that is, the environment outside is in a low-temperature state when the machine under test is heated, the machine under test is in a state of cooling and absorbing heat. Therefore, the effects of using electric heating and electric humidification are the same, and the heat release of the machine under test cannot be used to save energy. And considering that the water vapor generated by the ultrasonic humidifier is easy to adhere to the metal surface and freeze at low temperatures, especially the ice on the fan impeller will cause the fan to operate abnormally, so it is not suitable to use ultrasonic humidification at low temperatures.

[0004] The Chinese patent application (patent number 202310072610.1) discloses a scheme combining ultrasonic humidification and electric heating humidification for humidification in air-conditioning test rooms. However, the main purpose of the scheme is for rapid humidification, and the characteristics of electric humidification and ultrasonic humidification are not fully considered, namely the limitations of ultrasonic humidification under different temperature conditions, and the energy-saving of electric humidification when the machine under test releases heat. At the same time, the reliability of long-term operation of ultrasonic humidification is not considered. Summary of the invention

[0005] The first object of the present invention is to provide an air treatment system using ultrasonic humidification, which can improve the reliability of the ultrasonic humidification process and reduce the operating energy consumption of the air-conditioning test room.

[0006] The first object of the present invention is achieved by the following technical measures: an air treatment system using ultrasonic humidification, characterized in that it includes:

[0007] Suction electric heater and blow-out electric heater are used to heat the return air;

[0008] Evaporator, used to cool and dehumidify the return air;

[0009] A fan, used to drive return air;

[0010] Ultrasonic humidifier, used to vaporize water molecules to generate water vapor to humidify the return air;

[0011] Electric humidification equipment, used for electric heating to generate water vapor to humidify the return air;

[0012] Driven by the fan, the return air is heated through the suction electric heater and the blow-out electric heater, cooled and dehumidified through the evaporator, and humidified through the electric humidification equipment or ultrasonic humidifier, so as to blow the supply air with dry-bulb and wet-bulb temperatures that meet the test requirements into the environmental test room.

[0013] The invention can realize the reasonable utilization of ultrasonic humidification and electric humidification in the air-conditioning test room, improve the reliability of the use process of ultrasonic humidification, and reduce the operation energy consumption of the air-conditioning test room.

[0014] The ultrasonic humidifier described in the present invention is a component of an ultrasonic humidification system, which includes a water tank, a plurality of ultrasonic atomization plates arranged in the water tank, a water level float switch and a water temperature sensor. The ultrasonic humidification system includes a water treatment device, a hand valve, a first pneumatic ball valve, a circulating pump, a water pressure gauge, a water flow switch and a shell and tube heat exchanger connected in sequence through pipelines. The outlet of the shell and tube heat exchanger is connected to the upper part of the water tank, the first pneumatic ball valve is connected to the water level float switch, the circulating pump is connected to the water temperature sensor, the water outlet end of the second pneumatic ball valve is used for drainage, the water inlet end is connected to the pipeline between the first pneumatic ball valve and the circulating pump, and the water inlet end of the second pneumatic ball valve is connected to the bottom of the water tank.

[0015] A second object of the present invention is to provide a control method for the above-mentioned air treatment system using ultrasonic humidification.

[0016] The second object of the present invention is achieved by the following technical measures: A control method for the air treatment system using ultrasonic humidification, characterized in that it includes a switching process between ultrasonic humidification and electric humidification:

[0017] After the air treatment system is started, if the set temperature Ts is less than or equal to the target value T1, the electric humidification device is turned on and the ultrasonic humidifier is turned off. At this time, the second pneumatic ball valve is opened and the first pneumatic ball valve is closed for drainage;

[0018] If the set temperature Ts is greater than the target value T1, the ultrasonic humidifier is turned on and the electric humidifier is turned off at the same time. According to the difference between the humidity in the environmental test room and the set humidity, PID adjustment is performed through the UT meter to control the atomized water volume of the ultrasonic humidifier to achieve humidity control.

[0019] The control method of the present invention includes an ultrasonic humidification operation water replenishment process: after the ultrasonic humidifier is turned on, the water level float switch provides low water level and high water level signals according to the water level of the water tank, and when the water level float switch is at a low water level, the first pneumatic ball valve is opened for water replenishment; when the water level float switch is at a high water level, the first pneumatic ball valve is closed with a delay to complete the water replenishment.

[0020] The control method of the present invention includes a circulating water pump operation process: after the ultrasonic humidifier is turned on, when the water temperature of the water tank is lower than 5 degrees or higher than 40 degrees, the circulating water pump is operated, at which time the water in the water tank starts to circulate and exchanges heat with the outside through the shell and tube heat exchanger to ensure that the water temperature is 5-40°C.

[0021] The control method of the present invention includes an alarm process: after the circulating water pump is turned on, if there is no signal from the water flow switch, a water shortage protection is reported; after the first pneumatic ball valve is continuously opened for a set time, an abnormal water replenishment is prompted; and after the water level float switch continuously reports a low water level within a set time, a water shortage protection is reported.

[0022] Compared with the prior art, the present invention has the following significant effects:

[0023] (1) The present invention can realize the rational use of ultrasonic humidification and electric humidification in the air-conditioning test room, improve the reliability of the ultrasonic humidification process, and reduce the operating energy consumption of the air-conditioning test room.

[0024] (2) In view of the fact that ultrasonic humidification is prone to freezing when operating under low-temperature conditions, the present invention proposes a combined switching method of ultrasonic and electric heating humidification to meet the use of a wide range of temperatures. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0026] Figure 1 It is a schematic diagram of the composition structure of the air treatment system of the present invention;

[0027] Figure 2 It is a schematic diagram of the composition structure of the ultrasonic humidification system of the present invention.

[0028] In the figure: 1-suction electric heater, 2-evaporator, 3-ultrasonic humidifier, 4-fan, 5-blow-out electric heater, 6-electric humidification steam pipe, 7-tested machine, 8-water tank, 9-ultrasonic atomization plate, 10-water level float switch, 11-water temperature sensor, 12-water treatment device, 13-hand valve, 14-first pneumatic ball valve, 15-circulating pump, 16-water pressure gauge, 17-water flow switch, 18-shell heat exchanger, 19-second pneumatic ball valve, 20-air conditioning cabinet. DETAILED DESCRIPTION

[0029] The present invention is further illustrated below through the description of specific implementation methods, but this is not a limitation of the present invention. Those skilled in the art can make various modifications or improvements based on the basic idea of ​​the present invention, but as long as they do not deviate from the basic idea of ​​the present invention, they are all within the protection scope of the present invention.

[0030] like Figure 1 As shown, an air treatment system using ultrasonic humidification of the present invention comprises an inlet electric heater 1, an evaporator 2, an ultrasonic humidifier 3, a fan 4, an outlet electric heater 5 and an electric humidification device. The electric humidification device is placed in the equipment room. The water vapor generated by the electric humidification device through electric heating is sent to the electric humidification steam pipe 6 through a steam pipe and discharged into the environmental test room for humidification. The ultrasonic humidifier 3 is placed at the suction end of the fan 4, and the ultrasonic humidifier 3 is installed in the air conditioning cabinet 20. The ultrasonic humidifier 3 comprises a water tank 8, a plurality of ultrasonic atomizing plates 9, a water level float switch 10 and a water temperature sensor 11. The ultrasonic humidifier 3 vaporizes the water molecules in the water tank 8 through the high-frequency oscillation of the ultrasonic atomizing plate 9, and the generated water vapor is transported to the outlet electric heater 5 for heating and then discharged into the environmental test room for humidification. The evaporator 2 has a refrigerant in it to evaporate and absorb heat for refrigeration, and the return air is cooled and dehumidified. The inlet electric heater 1 and the outlet electric heater 5 are both electric heating devices, providing heat for heating. Driven by the fan, the return air is heated through the suction electric heater 1 and the blow-out electric heater 5, cooled and dehumidified through the refrigeration system evaporator 2, and humidified through the electric humidification equipment or ultrasonic humidifier 3, so as to blow out the supply air with dry-bulb and wet-bulb temperatures that meet the test requirements into the environmental test room.

[0031] like Figure 2 As shown, the ultrasonic humidifier 3 is a component of the ultrasonic humidification system, which includes a water treatment device 12, a hand valve 13, a first pneumatic ball valve 14, a circulating pump 15, a water pressure gauge 16, a water flow switch 17 and a shell and tube heat exchanger 18 connected in sequence through pipelines. The outlet of the shell and tube heat exchanger 18 is connected to the upper part of the water tank 8, the first pneumatic ball valve 14 is connected to the water level float switch 10, the circulating pump 15 is connected to the water temperature sensor 11, the water outlet end of the second pneumatic ball valve 19 is used for drainage, and the water inlet end is connected to the pipeline between the first pneumatic ball valve 14 and the circulating pump 15, and the water inlet end of the second pneumatic ball valve 19 is connected to the bottom of the water tank 8.

[0032] The water treatment device 12 is a water softener or a water purifier, which softens or purifies tap water. The hand valve 13 is a manual valve, and the opening can be manually adjusted to control the water flow. The first pneumatic ball valve 14 is opened or closed according to the signal of the water level float switch 10, so as to realize the water replenishment and water level control of the ultrasonic water tank 8, and ensure that the ultrasonic atomization plate 9 is completely immersed in the water and the water level is higher than h.

[0033] The second pneumatic ball valve 19 is used to drain water. When the second pneumatic ball valve 19 is opened, the water in the entire system will be drained. The circulation pump 15 operates according to the water temperature detected by the water temperature sensor 11, circulates the water in the ultrasonic water tank 8, exchanges heat with the outside through the sleeve heat exchanger 18, controls the temperature of the ultrasonic water tank 8, and prevents the temperature from being too high or too low, which may cause damage to the equipment. The water flow switch 17 detects the water flow signal to prevent the water pump from idling and burning.

[0034] A control method for the air treatment system using ultrasonic humidification, comprising:

[0035] Ultrasonic humidification and electric humidification switching process: After the air treatment system is started, ultrasonic humidification or electric humidification is selected according to the set temperature Ts. If the set temperature Ts is less than or equal to the target value T1 (settable), the electric humidification equipment is turned on and the ultrasonic humidifier is turned off. At this time, the second pneumatic ball valve is opened and the first pneumatic ball valve is closed for drainage to ensure that there is no water in the system pipeline to prevent freezing at low temperature;

[0036] If the set temperature Ts is greater than the target value T1, the ultrasonic humidifier is turned on and the electric humidifier is turned off at the same time. According to the difference between the humidity in the environmental test room and the set humidity, PID adjustment is performed through the UT meter. The output of the ultrasonic atomization plate is controlled by the pulse width modulation principle to control the atomized water volume of the ultrasonic humidifier to achieve humidity control.

[0037] Ultrasonic humidification operation water replenishment process: turn on the ultrasonic humidifier and close the second pneumatic ball valve. The water level float switch provides low water level and high water level signals according to the water level in the water tank. When the water level float switch is at a low water level, open the first pneumatic ball valve to replenish water; when the water level float switch is at a high water level, delay 5 seconds (settable) to close the first pneumatic ball valve to complete the water replenishment. Ensure that the water level in the ultrasonic water tank is higher than the height h of the ultrasonic atomization plate.

[0038] Circulating water pump operation process: Turn on the ultrasonic humidifier. When the water temperature in the water tank is lower than 5 degrees or higher than 40 degrees, the circulating water pump will start to operate. At this time, the water in the water tank begins to circulate and exchanges heat with the outside through the shell and tube heat exchanger to ensure that the water temperature is between 5-40℃ to prevent the ultrasonic atomization plate from freezing or being damaged by high temperature.

[0039] Alarm process: After starting the circulating water pump, if there is no signal from the water flow switch, it will report water shortage protection to prevent the water pump from drying out; after the first pneumatic ball valve is opened continuously for 1 minute (settable), it will prompt water replenishment abnormality; the water level float switch will report low water level within 5 seconds (settable) continuously, reporting water shortage protection.

[0040] The above embodiments are merely illustrative of the principles and effects of the present invention, and are not intended to limit the present invention. Anyone familiar with the technology may modify or change the above embodiments without violating the spirit and scope of the present invention. Therefore, all equivalent modifications or changes made by a person with ordinary knowledge in the technical field without departing from the spirit and technical ideas disclosed by the present invention shall still be covered by the claims of the present invention.

Claims

1. An air treatment system using ultrasonic humidification, characterized in that include: Suction electric heater and blow-out electric heater are used to heat the return air; Evaporator, used to cool and dehumidify the return air; A fan, used to drive return air; Ultrasonic humidifier, used to vaporize water molecules to generate water vapor to humidify the return air; Electric humidification equipment, used for electric heating to generate water vapor to humidify the return air; Driven by the fan, the return air is heated through the suction electric heater and the blow-out electric heater, cooled and dehumidified through the evaporator, and humidified through the electric humidification equipment or ultrasonic humidifier, so as to blow the supply air with dry-bulb and wet-bulb temperatures that meet the test requirements into the environmental test room.

2. The air treatment system using ultrasonic humidification according to claim 1, characterized in that: The ultrasonic humidifier is a component of the ultrasonic humidification system, which includes a water tank, a plurality of ultrasonic atomization plates arranged in the water tank, a water level float switch and a water temperature sensor. The ultrasonic humidification system includes a water treatment device, a hand valve, a first pneumatic ball valve, a circulation pump, a water pressure gauge, a water flow switch and a shell and tube heat exchanger connected in sequence through pipelines. The outlet of the shell and tube heat exchanger is connected to the upper part of the water tank, the first pneumatic ball valve is connected to the water level float switch, the circulation pump is connected to the water temperature sensor, the water outlet end of the second pneumatic ball valve is used for drainage, the water inlet end is connected to the pipeline between the first pneumatic ball valve and the circulation pump, and the water inlet end of the second pneumatic ball valve is connected to the bottom of the water tank.

3. A control method for an air treatment system using ultrasonic humidification according to claim 2, characterized in that: The process of switching between ultrasonic humidification and electric humidification is as follows: after the air treatment system is started, if the set temperature Ts is less than or equal to the target value T1, the electric humidification device is turned on and the ultrasonic humidifier is turned off. At this time, the second pneumatic ball valve is opened and the first pneumatic ball valve is closed for drainage; If the set temperature Ts is greater than the target value T1, the ultrasonic humidifier is turned on and the electric humidifier is turned off at the same time. According to the difference between the humidity in the environmental test room and the set humidity, PID adjustment is performed through the UT meter to control the atomized water volume of the ultrasonic humidifier to achieve humidity control.

4. The control method according to claim 3, characterized in that: The control method includes an ultrasonic humidification operation water replenishment process: after the ultrasonic humidifier is turned on, the water level float switch provides low water level and high water level signals according to the water level of the water tank, and when the water level float switch is at a low water level, the first pneumatic ball valve is opened for water replenishment; when the water level float switch is at a high water level, the first pneumatic ball valve is closed with a delay to complete the water replenishment.

5. The control method according to claim 4, characterized in that: The control method includes a circulating water pump operation process: after the ultrasonic humidifier is turned on, when the water temperature in the water tank is lower than 5 degrees or higher than 40 degrees, the circulating water pump is operated, at which time the water in the water tank starts to circulate and exchanges heat with the outside through the shell-and-tube heat exchanger to ensure that the water temperature is 5-40°C.

6. The control method according to claim 5, characterized in that: The control method includes an alarm process: after the circulating water pump is turned on, if there is no signal from the water flow switch, a water shortage protection is reported; after the first pneumatic ball valve is continuously opened for a set time, an abnormal water replenishment is prompted; and after the water level float switch continuously reports a low water level within a set time, a water shortage protection is reported.

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