CN213261873U - Anti-freezing control system of vehicle-mounted air conditioner - Google Patents
Anti-freezing control system of vehicle-mounted air conditioner Download PDFInfo
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- CN213261873U CN213261873U CN202021684403.XU CN202021684403U CN213261873U CN 213261873 U CN213261873 U CN 213261873U CN 202021684403 U CN202021684403 U CN 202021684403U CN 213261873 U CN213261873 U CN 213261873U
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Abstract
The utility model discloses a vehicle-mounted air conditioner anti-freezing control system, which is used for a closed circulation refrigeration loop consisting of a compressor, a condenser, a liquid storage device, a filter, an expansion valve and an evaporator, adopts the control of a CPU chip to collect the temperature of an evaporator coil and controls the start and stop of the compressor through the CPU chip of a controller, thereby achieving the purpose of normal work of a defrosting and recovery system and ensuring that the compressor is started again for more than 3 min; the medium-pressure switch is arranged between the condenser and the liquid storage device, the start and stop of the condensing fan are directly controlled, the pressure of the dynamic adjusting system is achieved, and the purposes of avoiding frosting and icing of the evaporator are achieved. The control of a CPU chip is adopted, and signals before starting of a low-pressure switch installed on a compressor muffler are collected, so that the problem that when the ambient temperature is too low, the low-pressure switch is in a disconnected state, and a system cannot be started is solved. By adopting effective control measures, the adaptability of the refrigerating system is ensured.
Description
Technical Field
The utility model relates to a vehicle-mounted air conditioner refrigerating system and control technical field especially relate to a vehicle-mounted air conditioner prevents frostbite control system.
Background
Electronic cabins, laser devices and the like of vehicle-mounted and onboard carrying equipment for carrying out transportation, communication, detection and other tasks usually run all the day long, and when the environmental temperature (usually below 18 ℃) is low, because heating elements such as the electronic devices and the laser devices in the cooled cabin have high heat, air-conditioning refrigeration is still needed to cool the cabin, so that a man-machine environment control device is required to provide proper working environment temperature for the cabin, and the safe and reliable working of the cabin is guaranteed. When a conventional vehicle-mounted air conditioner product works at normal temperature, the adjustment can be carried out through the liquid storage tank, but the evaporator frosts and freezes due to the fact that the refrigeration is still carried out when the ambient temperature is low, and even the liquid impact damage of the compressor can be caused, so that the normal use of a unit is influenced.
In addition, as the air conditioner runs along with the vehicle, the air conditioner is influenced by various factors such as environment, vibration and the like, the surface of the evaporator is also accumulated with dust and filth, the heat exchange of the evaporator is influenced, the evaporator is frosted and frozen when an evaporation fan fails, the rotating speed is reduced, the evaporator does not rotate, and the compressor is damaged if a timely defrosting measure is not taken.
Therefore, in order to implement the tasks of transportation, communication, detection, etc. for the vehicle-mounted air conditioner, which is matched with the electronic cabin, the laser device, etc. of the vehicle-mounted or onboard carrying equipment, when the vehicle-mounted air conditioner operates at low temperature, the system pressure is too low, and the surface of the evaporator is accumulated with dust, dirty and blocked, the failure of the evaporation fan, the reduction of the rotating speed, no rotation, etc. to cause the frosting and icing of the evaporator, the control measures adapted to the system should be taken to ensure the reliability of the refrigeration system.
Therefore, the anti-freezing control system of the vehicle-mounted air conditioner is designed, and the running state of the air conditioner refrigerating system is controlled and adjusted through the configuration of the refrigerating system, the control of the system pressure and the acquisition of the temperature value of the evaporator coil, so that the reliable running is ensured.
SUMMERY OF THE UTILITY MODEL
The utility model discloses the purpose is exactly in order to compensate prior art's defect, provides a vehicle-mounted air conditioner anti-freezing control system to when solving vehicle-mounted air conditioner all weather refrigeration operation, lead to the evaporimeter frosting, freeze because of various factors, cause compressor "liquid to hit" damage, influence the problem of unit normal use.
The utility model discloses a realize through following technical scheme:
a freezing prevention control system of a vehicle-mounted air conditioner is used for an all-weather refrigeration running system of the vehicle-mounted air conditioner and comprises a closed circulation refrigeration loop consisting of a compressor, a condenser, a liquid storage device, a filter, an expansion valve and an evaporator, wherein a sensor for detecting the temperature of an evaporator coil is arranged on the evaporator coil, a medium-pressure switch is arranged between the condenser and the liquid storage device, a low-pressure switch is arranged on a gas return pipe of the compressor, and a controller is used for carrying out logic judgment processing on input signals of the whole system and outputting the signals through a switching value output module. The controller comprises a CPU chip, a signal I/O interface, a signal input interface and a switching value output module which are integrated on a circuit board, wherein the signal I/O interface, the signal input interface and the switching value output module are respectively connected with the CPU chip, the signal input interface is also respectively connected with a sensor for detecting the temperature of an evaporator coil and a low-pressure switch, the switching value output module is also connected with a power end of an evaporator fan matched with the evaporator, a power end of a condensing fan matched with the condenser and a power end of a compressor, the CPU chip controls the compressor to start and stop through the switching value output module based on the temperature signal of the evaporator coil, and the CPU chip controls the compressor and the condensing fan to start and stop through the switching value output module based on the low-pressure switch signal.
The coil pipe of the evaporator is provided with a temperature sensing copper sleeve, the outer wall of the temperature sensing copper sleeve is welded on the wall of the coil pipe of the evaporator, and a temperature sensor of the coil pipe of the evaporator is coated with heat conducting glue and inserted into the temperature sensing copper sleeve from the pipe orifice of the temperature sensing copper sleeve.
The medium-pressure switch is inserted into a condenser and a liquid accumulator copper pipe, a brazing bar with the silver content of 15% is welded into a system, and a lead is connected with a condensing fan in series.
The low-pressure switch is inserted into the return copper pipe of the compressor, and is welded into the system by a brazing bar with silver content of 15%, and a lead is connected into the integrated electric control board.
The technology adopts the CPU chip to control, collects the temperature of the evaporator coil and controls the start and stop of the compressor through the CPU chip of the controller, thereby achieving the purpose of defrosting and recovering the normal work of the system and ensuring that the compressor is started again for more than 3 min; the medium-pressure switch is arranged between the condenser and the liquid storage device, the start and stop of the condensing fan are directly controlled, the pressure of the dynamic adjusting system is achieved, and the purposes of avoiding frosting and icing of the evaporator are achieved. The control of a CPU chip is adopted, and signals before starting of a low-pressure switch installed on a compressor muffler are collected, so that the problem that when the ambient temperature is too low, the low-pressure switch is in a disconnected state, and a system cannot be started is solved.
The technology controls the start and stop of the compressor by collecting the temperature of the evaporator coil. When the temperature of the evaporator coil is collected to be minus 7 ℃, the CPU chip outputs a compressor stopping signal through logic judgment and sends out a fault code, when the temperature of the evaporator coil is recovered to be 6 ℃, the CPU chip sends out a compressor starting signal, the compressor is started, and the interval time of the compressor for restarting is ensured to be more than 3min on a software program.
The technology is characterized in that a medium-pressure switch is arranged between a condenser and a liquid storage device of a system, the pressure of the system after condensation is controlled, namely the condensation pressure of a refrigerating system is sensed, a proper value (which can be set according to different use environments) is set for the medium-pressure switch, when the environment temperature is proper and the condensation pressure is higher than the set value of the medium-pressure switch, a pressure switch contact is in a normally closed state, a power supply loop of a condensation fan is closed, and the condensation fan normally operates; when the outdoor environment temperature is low and the condensing pressure is lower than the set value of the medium-pressure switch, the pressure switch contact is in a disconnected state, the power supply loop of the condensing fan is disconnected, and the condensing fan stops running; when the condensing pressure is recovered to be above the set value of the pressure switch, the contact of the pressure switch is closed, the power supply loop of the condensing fan is closed, and the condensing fan starts to operate again. Therefore, the starting and stopping of the condensing fan are controlled by setting the set value of the medium-pressure switch, and the condensing pressure of the system is ensured to be a proper value.
The low-pressure switch installed on the compressor muffler is connected with the low-pressure switch signal input interface on the controller, when the ambient temperature is too low, the low-pressure switch contact is in a disconnected state, and when the compressor is started, the system cannot be started. Therefore, through software control, the state of the low-pressure switch signal input interface is not detected within 1min before starting, the chip directly outputs a signal for starting the compressor, and the compressor is started. The pressure in the system is built up within 1min of compressor operation. And when the low-pressure comes, the contact of the low-pressure switch is closed, 1min later, the chip starts to detect the state of the signal input interface of the low-pressure switch, and the compressor is protected and controlled according to a logic program.
The utility model has the advantages that:
1. the utility model can control the start and stop of the compressor by collecting the temperature of the evaporator coil to achieve the purpose of defrosting;
the medium-pressure switch is arranged between the condenser and the liquid storage device in the refrigeration system to control the start and stop of the condensing fan, and the pressure of the system after condensation is dynamically adjusted, so that the evaporator is prevented from frosting and icing, and the compressor is prevented from being damaged by liquid impact; the problem that a system cannot be started when the low-pressure switch is in a disconnected state when the environmental temperature is too low is solved by acquiring a signal before starting the low-pressure switch arranged on an air return pipe of the compressor;
2. the utility model has novel technology, and can effectively avoid the frosting of the evaporator caused by various factors of the vehicle-mounted air conditioning system and effective defrosting measures taken by frosting and icing;
3. the utility model has low cost, low failure rate, safety and reliability;
4. the utility model realizes man-machine conversation and is convenient to use;
5. the utility model discloses an adopt effectual control measure, solved the big refrigerating system's of temperature variation adaptability big with load change.
Drawings
Fig. 1 is a block diagram of a closed cycle refrigeration circuit.
Fig. 2 is a schematic block diagram of the present invention.
Detailed Description
As shown in fig. 1 and 2, the anti-freezing control system for the vehicle-mounted air conditioner is used for a closed circulation refrigeration loop consisting of a compressor 1, an evaporator 3 with an evaporation fan 2, an expansion valve 4, a filter 5, an accumulator 6 and a condenser 7 with a condensation fan 9. In the closed circulation refrigeration system, the exhaust end of a compressor 1 is connected with the inlet end of a condenser 7 through a copper pipe, the outlet end of the condenser 7 is communicated with the interior of a liquid storage device 6 through a copper pipe, the interior of the liquid storage device 6 is also connected with the inlet end of a filter 5 through a copper pipe, the outlet end of the filter 5 is connected with the inlet end of an expansion valve 4 through a copper pipe, the outlet end of the expansion valve 4 is connected with the inlet end of an evaporator 3 through a copper pipe, and the outlet end of the evaporator 3 is connected with the air return end of the compressor.
As shown in fig. 2, the control system includes an integrated circuit board 12, a CPU chip 13 integrated on the electronic control board 12, a switching value output module, a signal input interface, a display panel I/O interface 19, a compressor 1, an evaporation fan 2, a condensation fan 9, a medium pressure switch 11, a low pressure switch 10, a coil temperature sensor 8, and a display panel 20. The switching value output module is a relay module and comprises a condensation fan relay module 14, an evaporation fan relay module 15 and a compressor relay module 16. The signal input interface comprises a coil temperature sensor signal input interface 18 and a low-pressure switch signal input interface 17.
A CPU chip 13, a compressor relay module 16, a condensing fan relay module 14, an evaporating fan relay module 15, a low-pressure switch signal input interface 17, a coil temperature sensor signal input interface 18 and a display panel I/O interface 19 which are integrated on the circuit board 12 are respectively connected with the CPU chip, wherein the low-pressure switch signal input interface 17 and the coil temperature sensor signal input interface 18 are also respectively connected with a low-pressure switch and a sensor in a one-to-one correspondence manner; the compressor relay module 16, the condensing fan relay module 14 and the evaporating fan relay module 15 are also respectively connected with a power supply end of the compressor 1, a power supply end of the condensing fan 9 matched with the condenser and a power supply end of the evaporating fan 2; the CPU chip 13 controls the start and stop of the compressor and the condensing fan through the compressor relay module 16 and the condensing fan relay module 14 based on the signal of the low-pressure switch 10; the CPU chip 13 controls the compressor to start and stop through the compressor relay module 16 based on the signal of the coil temperature sensor 8. The medium-pressure switch 11 directly controls the start and stop of the condensing fan 9 according to a set value; the display panel 20 is connected to the display panel I/O interface 19.
And (3) powering on and starting up, wherein the CPU chip 13 does not detect the state of the signal input interface 17 of the low-voltage pressure switch 10 within 1min, the CPU chip 13 directly outputs signals to the relay module 16 of the compressor, the relay module 16 is electrified, the contact is closed, and the compressor 1 works. After 1min, the CPU chip 13 starts to detect the signal state fed back to the low pressure switch signal input interface 17 by the low pressure switch 10, perform protection control on the compressor 1 according to a logic program, and send the system operating state to the display panel 20.
When the condensing pressure of the system is higher than the set value of the medium-pressure switch 11, the contact of the medium-pressure switch 11 is in a normally closed state, and the condensing fan 9 works normally; when the condensing pressure is lower than the set value of the medium-pressure switch 11, the contact of the medium-pressure switch 11 is in a disconnected state, and the condensing fan 9 stops running; when the condensing pressure is recovered to be above the set value of the medium-pressure switch 11, the contact of the medium-pressure switch 11 is closed, and the condensing fan 9 works normally again; therefore, the starting and stopping of the condensing fan are controlled by setting the set value of the medium-pressure switch, and the condensing pressure of the system is ensured to be a proper value.
When the collected signal input interface 18 of the coil temperature sensor is-7 ℃, the CPU chip 13 outputs a signal for stopping the compressor 1 through logic judgment and sends out a fault code, when the signal input interface 18 of the coil temperature sensor is recovered to 6 ℃, the CPU chip 13 sends out a signal for starting the compressor, the compressor 1 is started, and the interval time of more than 3min for restarting the compressor 1 is ensured on a software program.
The starting and stopping of the compressor are controlled by collecting the temperature of the evaporator coil, so that the aim of defrosting is fulfilled; the medium-pressure switch is arranged between the condenser and the liquid storage device in the refrigeration system to control the start and stop of the condensing fan, and the pressure of the system after condensation is dynamically adjusted, so that the evaporator is prevented from frosting and icing, and the compressor is prevented from being damaged by liquid impact; the problem that the system cannot be started when the low-pressure switch is in a disconnected state when the ambient temperature is too low is solved by collecting signals before starting the low-pressure switch arranged on the air return pipe of the compressor, and the reliable operation of the system is ensured.
The above embodiments are not limited to the protection scope of the present invention, and all modifications or changes based on the basic idea of the present invention belong to the protection scope of the present invention.
Claims (7)
1. The utility model provides a vehicle-mounted air conditioner prevents frostbite control system for by the compressor, have condenser, reservoir, filter, expansion valve of condensing fan and have the closed circulation refrigeration circuit that the evaporimeter of evaporating fan constitutes, its characterized in that: the evaporator coil is provided with a coil temperature sensor for detecting the temperature of the evaporator coil, a muffler of the compressor is provided with a low-pressure switch, the evaporator coil further comprises a controller, the controller comprises a CPU chip, a signal I/O interface, a signal input interface and a switching value output module, the signal I/O interface, the signal input interface and the switching value output module are respectively connected with the CPU chip, the signal input interface is respectively connected with the coil temperature sensor and the low-pressure switch, the switching value output module is respectively connected with a power end of an evaporation fan, a power end of a condensation fan and a power end of the compressor, the CPU chip controls the compressor to start and stop through the switching value output module based on the coil temperature signal of the coil temperature sensor, and the CPU chip controls the compressor to start and stop through the switching value output module based on the signal of the low-pressure switch, And starting and stopping the condensing fan.
2. The vehicle-mounted air conditioner anti-freezing control system according to claim 1, characterized in that: the exhaust end of the compressor is connected with the inlet end of the condenser through a pipeline, the outlet end of the condenser is communicated with the interior of the liquid storage device through a pipeline, the interior of the liquid storage device is also connected with the inlet end of the filter through a pipeline, the outlet end of the filter is connected with the inlet end of the expansion valve through a pipeline, the outlet end of the expansion valve is connected with the inlet end of the evaporator through a pipeline, and the outlet end of the evaporator is connected with the air return end of the compressor through a pipeline, so that.
3. The vehicle-mounted air conditioner anti-freezing control system according to claim 1, characterized in that: the coil pipe of the evaporator is provided with a temperature sensing copper sleeve, the outer wall of the temperature sensing copper sleeve is welded on the wall of the coil pipe of the evaporator, and the coil pipe temperature sensor is coated with heat conducting glue and inserted into the temperature sensing copper sleeve from the pipe orifice of the temperature sensing copper sleeve.
4. The vehicle-mounted air conditioner anti-freezing control system according to claim 1, characterized in that: and a medium-pressure switch is arranged between the condenser and the liquid storage device and is connected with the condensing fan in series.
5. The vehicle-mounted air conditioner anti-freezing control system according to claim 1, characterized in that: the switching value output module is a relay module and comprises a condensation fan relay module, an evaporation fan relay module and a compressor relay module.
6. The vehicle-mounted air conditioner anti-freezing control system according to claim 1, characterized in that: the signal I/O interface is also connected with a display panel.
7. The vehicle-mounted air conditioner anti-freezing control system according to claim 1, characterized in that: the signal input interface comprises a coil temperature sensor signal input interface and a low-pressure switch signal input interface.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202021684403.XU CN213261873U (en) | 2020-08-13 | 2020-08-13 | Anti-freezing control system of vehicle-mounted air conditioner |
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| CN202021684403.XU CN213261873U (en) | 2020-08-13 | 2020-08-13 | Anti-freezing control system of vehicle-mounted air conditioner |
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| CN213261873U true CN213261873U (en) | 2021-05-25 |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111823824A (en) * | 2020-08-13 | 2020-10-27 | 合肥天鹅制冷科技有限公司 | Anti-freezing control system of vehicle-mounted air conditioner |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111823824A (en) * | 2020-08-13 | 2020-10-27 | 合肥天鹅制冷科技有限公司 | Anti-freezing control system of vehicle-mounted air conditioner |
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