A mobile constant temperature fresh air device

Abstract

The present invention discloses a mobile constant temperature fresh air device, comprising a compressor, an electric heater, a PLC electric control box, a mobile air duct, a water pump, a condenser, a condensing fan, an evaporator, a blower, an expansion valve, a liquid storage tank, a gas-liquid separator, a pressure and temperature sensor, and a vehicle-mounted device. The electric control box is composed of a Siemens PLC, a touch screen and other low-voltage switch elements, and is used to measure the temperature and protect signals in a receiving system and to control the system. Through the device, constant temperature fresh air is provided for equipment and personnel in a closed environment, and the temperature, humidity and oxygen-deficient environment of a working surface are improved, so as to solve the problems that are difficult to be achieved by ordinary air-conditioning equipment in the prior art.

Description

Technical Field

[0001] The present invention relates to the technical field of fresh air cooling and heating equipment, and in particular to a mobile constant temperature fresh air equipment. Background Art

[0002] At present, many constant temperature environments use circulating air cooling and heating to maintain a certain temperature. In many closed environments and mobile workplaces, precision equipment and personnel require constant temperature fresh air. When the ambient temperature is high or low, the humidity is high, and the equipment is not ventilated, it is difficult for precision equipment and personnel to work normally. Therefore, a mobile constant temperature fresh air device is needed to provide fresh air to the working environment and maintain a certain temperature. However, general air-conditioning equipment is difficult to meet the temperature and fresh air requirements of a closed environment. Summary of the invention

[0003] The purpose of the present invention is to make up for the defects of the existing technology and provide a mobile constant temperature fresh air device. Through this device, constant temperature fresh air is provided for equipment and personnel in a closed environment, the temperature, humidity and oxygen-deficient environment of the working surface are improved, so as to solve the problems that are difficult to achieve with ordinary air-conditioning equipment in the prior art.

[0004] The present invention is achieved through the following technical solutions:

[0005] A mobile constant temperature fresh air device comprises a scroll compressor, a three-way valve, an air-cooled condenser, an air-cooled condenser, a three-way valve, a liquid storage tank, a drying filter, a sight glass, an expansion valve, a bypass solenoid valve, an evaporator, a gas-liquid separator, an air inlet pipe, a blower and an air supply pipe, wherein the output end of the scroll compressor is connected to the input end of the three-way valve, one end of the output end of the three-way valve is connected to the input end of the air-cooled condenser, and the other end is connected to the input end of the air-cooled condenser, the output end of the air-cooled condenser is connected to the input end of the three-way valve, the output end of the air-cooled condenser is connected to the other input end of the three-way valve, the output end of the three-way valve is connected to the input end of the liquid storage tank, and the liquid storage tank The output end is connected to the input end of the drying filter, the output end of the drying filter is connected to the input end of the sight glass, the output end of the sight glass is connected to the input end of the expansion valve, the branch one of the output end of the expansion valve is connected to the input end of the bypass solenoid valve through a pipeline, the output end of the bypass solenoid valve is connected to the input pipe of the gas-liquid separator, the branch two of the output end of the expansion valve is connected to the input end of the evaporator, the output end of the evaporator is connected to the input end of the gas-liquid separator, the output end of the gas-liquid separator is connected to the input end of the scroll compressor, the evaporator is located at the inlet of the air inlet pipe, an electric heater is also installed at the inlet of the air inlet pipe, the outlet of the air inlet pipe is connected to the inlet of the blower, and the outlet of the blower is connected to the air supply pipe.

[0006] A temperature and humidity sensor 1, an air filter and a pressure difference controller are also installed at the entrance of the air inlet pipe; a temperature and humidity sensor 2, a wind pressure sensor, a wind speed sensor and a manual air volume adjustment switch are installed at the air outlet of the air supply pipe.

[0007] An exhaust temperature protection valve, a high pressure switch and a high pressure sensor are sequentially installed on the pipeline between the scroll compressor and the three-way valve.

[0008] Condensation fan 1 and condensation fan 2 are respectively provided on the sides of the air-cooled condenser 1 and the air-cooled condenser 2. The speeds of condensation fan 1 and condensation fan 2 are adjusted according to the signals given by the high-pressure pressure sensor to keep the condensation pressure at a certain value.

[0009] A low-pressure pressure sensor and a low-pressure pressure switch are sequentially installed on the pipeline between the output end of the gas-liquid separator and the input end of the scroll compressor.

[0010] PLC control is adopted, and the electric heater operates with solid-state relays and PWM output voltage of a frequency controller.

[0011] According to the set temperature, the scroll compressor starts and works with the electric heater without stopping. According to the temperature and humidity sensor, PID is used to control the set air temperature.

[0012] The air outlet is equipped with a manual air volume adjustment switch to adjust the air volume according to the wind pressure sensor and wind speed sensor.

[0013] The refrigeration system defrosts by hot gas bypass defrosting with a bypass solenoid valve, and the scroll compressor does not need to be shut down during defrosting.

[0014] The present invention is installed on a vehicle-mounted device, is convenient for mobile use, and the length of the air supply pipe is adjustable. The present invention adopts Siemens PLC-200 SMART and touch screen human-machine operation, and monitors the temperature, humidity, wind pressure, wind speed and other parameters of the unit through 485 interface remote communication, and operates the start and stop of the unit. When the unit is working, the air supply fan is started first, and then the scroll compressor and the electric heater are started according to the set temperature.

[0015] PLC-200SMART control is adopted for control, scroll compressor cooling and electric heating are used for fresh air temperature control, and the system's air outlet pressure, wind speed and supply air temperature are detected.

[0016] The unit is controlled by Siemens PLC-200 SMART controller and touch screen control, using Noyak air switch and AC contactor, the air supply centrifugal fan uses a high-speed high-pressure fan, the air supply temperature can be set, the refrigeration system uses high-voltage protection, low-voltage protection, overload protection, power supply protection and various system protections, and has a 485 interface, which can be modularly controlled and remotely monitored.

[0017] The advantages of the present invention are: the present invention provides mobile constant temperature fresh air, provides constant temperature fresh air for equipment and personnel in a closed environment, improves the temperature, humidity and oxygen-deficient environment of the working surface, and ensures the normal work of the equipment and personnel. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a structural schematic diagram of the present invention. DETAILED DESCRIPTION

[0019] like Figure 1As shown, a mobile constant temperature fresh air device is characterized by: comprising a scroll compressor 1, an electric heater 23, a PLC electric control box 31, a mobile air inlet pipe 24, an air supply pipe 30, a water pump, a condenser, a condensing fan, an evaporator 16, a blower 25, an expansion valve 14, a liquid storage tank 11, a gas-liquid separator 17, a pressure and temperature sensor, and vehicle-mounted equipment: The output end of the scroll compressor 1 (ZR42K3-TFD) is connected to the input end of the three-way valve 15 through a pipeline DN12.7, one end of the output end of the three-way valve 15 is connected to the input end of the air-cooled condenser 18, and the other end is connected to the input end of the air-cooled condenser 29, the output end of the air-cooled condenser 18 is connected to the input end of the three-way valve 210, the output end of the air-cooled condenser 29 is connected to the other input end of the three-way valve 210, the output end of the three-way valve 210 is connected to the input end of the liquid storage tank 11 (CLS08-13 / 13), the output end of the liquid storage tank 11 (CLS08-13 / 13) is connected to the input end of the drying filter 12 (EK084S) through a pipeline, the drying filter 12 (EK084S ) output end is connected to the input end of the sight glass 13 (HMI-TT4) through a pipeline, the output end of the sight glass 13 (HMI-TT4) is connected to the input end of the expansion valve 14 (HFE10H) through a pipeline, the output end of the expansion valve 14 (HFE10H) branch one is connected to the input end of the bypass solenoid valve 15 (EVR6) through a pipeline DN12, the output end of the bypass solenoid valve 15 (EVR6) is connected to the input pipe of the gas-liquid separator 17 (A-AS5139), the output end of the expansion valve 14 (HFE10H) branch two is connected to the input end of the evaporator 16 through a pipeline, the output end of the evaporator 16 is connected to the input end of the gas-liquid separator 17, and the output end of the gas-liquid separator 17 (A-AS 5139) is connected to the input end of the compressor 1 through a pipeline DN22.2. The air inlet pipe 24 is equipped with a temperature and humidity sensor 20 (RSHT-2-2-C-150-2-1), an air filter 21, a pressure difference controller 22 (QBM81), an evaporator 16, and an electric heater 23 (12KW fin heater) connected to the input end of the blower 25 (RG45T-2DN.F5.1R). The outlet of the blower 25 (RG45T-2DN.F5.1R) is connected to the air supply pipe 30. The air supply pipe 30 is equipped with a temperature and humidity sensor 26 (RSHT-2-2-C-150-2-1), a wind pressure sensor 27 (DG-131), a wind speed sensor 28 (CTV110WS), and a manual air volume adjustment switch 29.

[0020] An exhaust temperature protection valve 2, a high pressure switch 3 and a high pressure sensor 4 are sequentially installed on the pipeline between the scroll compressor 1 and the three-way valve 5.

[0021] A low-pressure pressure sensor 18 and a low-pressure pressure switch 19 are installed in sequence on the pipeline between the output end of the gas-liquid separator 17 and the input end of the scroll compressor 1 .

[0022] The air inlet pipe 24 is equipped with a temperature and humidity sensor 20 (RSHT-2-2-C-150-2-1), an air filter 21, a pressure difference controller 22 (QBM81), an evaporator 16, and an electric heater 23 (12KW fin heater) connected to the input end of the fan 25 (RG45T-2DN.F5.1R). The outlet of the blower 25 (RG45T-2DN.F5.1R) is connected to the air supply pipe 30. The air supply pipe 30 is equipped with a temperature and humidity sensor 26 (RSHT-2-2-C-150-2-1), a wind pressure sensor 27 (DG-131), a wind speed sensor 28 (CTV110WS), and a manual air volume adjustment switch 29.

[0023] Condensing fan 1 6 and condensing fan 2 7 (S4D450-AU01-01) can adjust the speed of the condensing fan (S4D450-AU01-01) through PLC (S7-200 SAMRT) according to the signal given by the high-pressure pressure sensor 4 (PT5-30M) to keep the condensing pressure at a certain value.

[0024] PLC (S7-200 SMART) control is adopted, and the electric heater 23 (12KW fin type heater) operates by the PWM output voltage of the solid state relay (SSR-3H380D75) and the cycle controller (SSR-CYC).

[0025] According to the set temperature, the scroll compressor 1 (ZR42K3-TFD) starts and works with the electric heater 23 (12KW fin heater) without stopping. According to the temperature and humidity sensor 26 (RSHT-2-2-C-150-2-1), PID control is adopted through PLC (S7-200SMART) to make the outlet air temperature reach the set value.

[0026] The air outlet is equipped with a manual air volume adjustment switch 29, which adjusts the air volume according to the wind pressure sensor 27 (DG-131) and the wind speed sensor 28 (CTV110WS).

[0027] The refrigeration system defrosts by hot gas bypass defrosting using bypass solenoid valve 15 (EVR6). The scroll compressor 1 (ZR42K3-TFD) does not need to be shut down during defrosting.

[0028] The constant temperature fresh air system is installed on a vehicle-mounted device, which is convenient for mobile use and the length of the air supply pipe is adjustable.

[0029] The present invention adopts Siemens PLC S7-200 SMART and touch screen (SMART 700IEV3) to form an electric control box 31, which is used to measure temperature and protection signals in the receiving system and realize the control of the system.

[0030] The specific working process of the present invention is as follows:

[0031] When the equipment is working, after the unit is powered on, the start-up command is given through the touch screen (SMART 700IEV3) on the electric control box 31. First, the outlet temperature Te (25℃) is set according to the user's requirements, and various protection parameters such as pressure, current, exhaust temperature, etc. are set. After power is turned on, the blower 25 (RG45T-2DN.F5.1R) is started first, and the delay is 2-3 minutes in sequence to detect the supply air temperature T. When the supply air temperature T is within the range of Te-ΔT≤T≤Te+ΔT, the system is in ventilation. When the supply air temperature T>Te+ΔT, the scroll compressor 1 (ZR42K3-TFD) is started, and the system enters the cooling and refrigeration mode and keeps the scroll compressor 1 (ZR42K3-TFD) working all the time. When the supply air temperature T<Te-ΔT is detected, the electric heater 23 (12KW fin heater) is started, and the system enters the heating mode. The PWM heating output power is adjustable (0~100%), and the PLC (S7-200 SMART), PID control is adopted for the outlet air temperature T, so that the fresh air outlet reaches the set value T. When the condensing pressure drops to ≤13KG / cm², the condensing fan speed drops to the minimum, and when the condensing pressure rises to ≥18KG / cm², the condensing fan speed rises to the maximum. When the condenser temperature is ≤-4℃, the bypass solenoid valve 15 (EVR6) bypasses the hot gas for defrosting, and the defrosting ends when the condenser temperature is ≥8℃. When the high-pressure switch 3 and the low-pressure switch 19 of the system have high and low protection, the system alarms and stops the scroll compressor 1 (ZR42K3-TFD) from continuously running and supplying air. When the system exhaust temperature protection 2 temperature is ≥105℃, an alarm will be issued. When the differential pressure controller 22 (QBM81) alarms, the user can be prompted to clean or replace the air filter 21.

[0032] The electric control box 31 is composed of Siemens PLC-200 SMART (CPU module SR30AC / DC / RLY, analog module EMAE04, temperature resistance module EMAR04), touch screen (SMART 700IEV3), AC contactor EX9C 2511, thermal overload relay (EX9R3813), molded case circuit breaker (EX9M2S SU20 AC 160 3P), intermediate relay (RXM2AB2P7), phase sequence protector (RM4TG20), emergency stop switch (XB2BS542C), indicator light (AD16-22 / AC / CD / 220V) to control the operation of the unit. If the user needs remote control, he can use 485 communication line to connect the unit controller to control and modify the unit operation parameters.

[0033] Generally speaking, the present invention uses the temperature sensor of the equipment outlet air to instantly feed back the outlet air temperature T to the controller, compares the outlet air temperature T with the set value Te, and when the temperature sensed by the temperature sensor is higher than the set value, the controller gives a signal to start the scroll compressor 1 (ZR42K3-TFD) for refrigeration; when the outlet air temperature is lower than the set value Te-ΔT, the controller gives a signal to start the electric heater 23 (12KW fin heater) with adjustable power (0-100%) PWM control, and performs PID control on the outlet air temperature of the fresh air, so as to accurately control the fresh air supply temperature to meet the needs of equipment and personnel, and stop the scroll compressor 1 (ZR42K3-TFD) when the system is protected.

[0034] The above embodiments are merely descriptions of preferred implementation modes of the present invention, and are not intended to limit the scope of the present invention. Without departing from the design spirit of the present invention, various modifications and improvements to the technical solutions of the present invention by ordinary technicians in this field should all fall within the protection scope of the claims of the present invention.

Claims

1. A mobile constant temperature fresh air device, characterized in that: The invention comprises a scroll compressor, a three-way valve, an air-cooled condenser, a two air-cooled condensers, a two three-way valve, a liquid storage tank, a drying filter, a liquid sight glass, an expansion valve, a bypass solenoid valve, an evaporator, a gas-liquid separator, an air inlet pipe, a blower and an air supply pipe, wherein the output end of the scroll compressor is connected to the input end of the three-way valve, one end of the output end of the three-way valve is connected to the input end of the air-cooled condenser, and the other end is connected to the input end of the two air-cooled condensers, the output end of the air-cooled condenser is connected to the input end of the three-way valve, the output end of the two air-cooled condensers is connected to the other input end of the three-way valve, the output end of the three-way valve is connected to the input end of the liquid storage tank, and the output end of the liquid storage tank is connected to the drying filter. The filter input end is connected, the dry filter output end is connected to the sight glass input end, the sight glass output end is connected to the expansion valve input end, the branch one of the expansion valve output end is connected to the bypass solenoid valve input end through a pipeline, the bypass solenoid valve output end is connected to the gas-liquid separator input pipe, the branch two of the expansion valve output end is connected to the evaporator input end, the evaporator output end is connected to the gas-liquid separator input end, the gas-liquid separator output end is connected to the scroll compressor input end, the evaporator is located at the inlet of the air inlet pipe, an electric heater is also installed at the inlet of the air inlet pipe, the outlet of the air inlet pipe is connected to the inlet of the blower, and the outlet of the blower is connected to the air supply pipe; A temperature and humidity sensor 1, an air filter and a pressure difference controller are also installed at the inlet of the air inlet pipe; a temperature and humidity sensor 2, a wind pressure sensor, a wind speed sensor and a manual air volume adjustment switch are installed at the air outlet of the air supply pipe; An exhaust temperature protection valve, a high pressure switch and a high pressure sensor are sequentially installed on the pipeline between the scroll compressor and the three-way valve.

2. A mobile constant temperature fresh air device according to claim 1, characterized in that: Condensation fan 1 and condensation fan 2 are respectively provided on the sides of the air-cooled condenser 1 and the air-cooled condenser 2. The speeds of condensation fan 1 and condensation fan 2 are adjusted according to the signals given by the high-pressure pressure sensor to keep the condensation pressure at a certain value.

3. The mobile constant temperature fresh air device according to claim 1, characterized in that: A low-pressure pressure sensor and a low-pressure pressure switch are sequentially installed on the pipeline between the output end of the gas-liquid separator and the input end of the scroll compressor.

4. The mobile constant temperature fresh air device according to claim 1, characterized in that: The electric heater is controlled by PLC and works by using a solid-state relay and a PWM output voltage of a frequency controller.

Images