KR100350109B1 - The automobile supplementary refrigeration system and operating method - Google Patents

Abstract

The present invention relates to a refrigeration vehicle mounting auxiliary refrigeration system that can perform a refrigeration function using an external AC power source even when the engine is stopped in a refrigeration vehicle comprising a main refrigeration system using a belt driven compressor.

To this end, in the present invention, a combination of an AC power refrigeration compressor unit for compressing refrigerant gas, recovering and storing refrigeration oil, and a connecting pipe kit for connecting it to the main refrigeration system refrigeration pipe of a refrigeration vehicle, and the amount of refrigerant in the main refrigeration system and the auxiliary refrigeration system An auxiliary refrigeration system for a refrigeration vehicle, comprising a refrigerant control unit for selectively controlling a refrigerant, an electric control unit combination for controlling and controlling an operation of an auxiliary refrigeration system, and a method of operating the system.

Therefore, the present invention improves the refrigeration efficiency and durability at the same time, improves the workability of the vehicle and the convenience of use, and performs a smooth freezing function in the configuration of the refrigeration cycle and the electric control device even when the main refrigeration unit is operated separately. To provide a possible refrigeration vehicle auxiliary refrigeration system.

Description

{The automobile supplementary refrigeration system and operating method}

The present invention relates to a refrigeration vehicle mounting auxiliary refrigeration system that can perform a refrigeration function using an external AC power source even when the engine is stopped in a refrigeration vehicle comprising a main refrigeration system using a belt driven compressor.

As regulations on the transport and distribution of frozen stored foods have been tightened, the use of frozen vehicles in food transportation is becoming more common. During the day, while the refrigeration vehicle is running, the temperature of the load can be maintained by the main refrigeration system driven by the engine. However, in the case of night parking or when the engine must be stopped for a long time, the inconvenience of having to reload the frozen load into the freezer. In order to solve this problem, there is a need for an auxiliary refrigeration system that can perform a refrigeration function even when the engine is stopped.

1 and 2 show a block diagram of the prior art associated with the present invention. In FIG. 1, a compression drive device 610 composed of an AC motor and a belt driven second compressor is connected in parallel to a main refrigeration device driven by vehicle engine power.

The main refrigeration unit is the high pressure side refrigeration pipe 500, the first compressor 501, the condenser 502, receiver dryer 503, expansion device 504, evaporator 505, differential pressure detection line 506, low pressure side It includes a refrigeration pipe 507 and the magnetic clutch 510. The compression drive device 610 is a high pressure side connection pipe 600, low pressure side connection pipe 601, discharge port 602, suction port 603, magnetic clutch 604, second compressor 605, drive belt 606 ), An AC motor 607, a power box 608, and an AC power source 609.

In the main refrigerator, the first compressor 501 is intermittently operated by the magnetic clutch 510. Also in the compression driving device 610, the second compressor is intermittently driven by the AC motor 607 and the magnetic clutch 604. When the main refrigerating device 501 is operated, the refrigerant gas of high temperature and high pressure flows out through the discharge port 501a of the first compressor 501. However, when the compression driving device 610, which is the auxiliary refrigerating device, is operated, the second compressor 605 is operated. It is discharged from the discharge port 602 of the is cooled in the condenser 502 through the high-pressure connection pipe 600. At the outlet of the condenser 502, the refrigerant becomes a high pressure liquid state, passes through the receiver and the dryer 503, becomes a low temperature low pressure refrigerant in the expansion device 504, enters the evaporator, absorbs heat inside the freezer, do. In this case, a capillary tube or a thermally sensitive expansion device is used as the expansion device, and in the case of the thermally sensitive expansion device, the refrigerant flows through the expansion device by adjusting the low pressure through the differential pressure sensing line 506. The refrigerant flowing out of the evaporator flows into the inlet 603 of the second compressor 605 through the low pressure side connection pipe 601. Therefore, the temperature of the freezer can be maintained by driving the second compressor by a motor using an AC power source without driving the engine.

However, the auxiliary refrigeration apparatus using the AC motor not only requires excessive installation space when the vehicle is mounted, but also the AC motor has to be operated continuously, resulting in relatively low energy efficiency. In order to change the rotational speed of the AC motor, a three-phase induction motor and an additional rotational speed inverter must be separately installed, which requires a lot of installation cost.

2 shows a refrigerating device including a DC power compressor 707 and an AC generator 712 using an engine driving force or AC power. The refrigeration unit is a high pressure side refrigeration pipe 500, the first compressor 501, condenser 502, receiver dryer 503, expansion device 504, evaporator 505, differential pressure sensing line 506, low pressure side Refrigeration pipe 507, DC power compressor 707, stop 710, the electronic switching switch 711, AC generator 712, drive belt 713, the engine 512. Instead of using the belt driven first and second compressors 501 and 605 shown in FIG. 1, only a compressor equipped with a DC motor 709 was used to form a refrigeration apparatus. The AC generator 712 generates AC power when driven by the engine 512, generates DC power at a stop through the electronic changeover switch 711, and drives the DC power compressor 707. When the engine is stopped, an AC power source 714 is used to generate a direct current for driving the compressor at the stop 710.

In the refrigeration apparatus shown in FIG. 2, the alternator 712 is connected to the pulley and the belt 713 of the engine 512, and thus, the installation of the alternator 712 is accompanied by a problem. Since the alternator must be additionally installed in the engine room as part of the refrigeration system, it may be difficult to secure an installation space and may interfere with the normal operation of the engine and affect the driving performance and safety of the vehicle. In addition, since the alternating current is generated and rectified to drive the DC power compressor 707, the rotational speed of the DC motor must be varied in conjunction with the rotational speed of the engine in order to reduce energy efficiency and control the temperature of the freezer. The control circuit becomes complicated.

The main object of the present invention is to provide a refrigeration vehicle that can perform a refrigeration function using an external AC power source even when the engine is stopped in a refrigeration vehicle that constitutes a main refrigeration system using a belt driven compressor that depends on engine power. To provide a secondary refrigeration system. Therefore, the present invention improves the refrigeration efficiency and durability at the same time, improves the workability of the vehicle and the convenience of use, and performs a smooth freezing function in the configuration of the refrigeration cycle and the electric control device even when the main refrigeration unit is operated separately. To provide a possible refrigeration vehicle auxiliary refrigeration system.

1: Schematic diagram of a refrigerating apparatus according to the prior art (secondary refrigerating apparatus driven by the AC motor and the belt)

2: Schematic diagram of a refrigerating device according to the prior art (secondary refrigerating device driven by the AC generator and the stop)

3 is a block diagram of an AC power supply refrigeration apparatus according to the present invention

4 is an electric circuit diagram of an AC power supply refrigeration apparatus according to the present invention

Fig. 5: Operation sequence and method of AC power auxiliary refrigeration apparatus according to the present invention

* Description of the main parts of the drawings

100: Vehicle installation connection piping kit of AC power auxiliary refrigeration unit

101: vehicle mounting refrigeration compression device combination of the AC power auxiliary refrigeration unit

102: Combined electric control device for vehicle mounting of the auxiliary power auxiliary refrigeration unit

103: vehicle refrigerant amount control device of the AC power auxiliary refrigeration unit

110: high pressure side pipe connection tee

111: high pressure side pressure release

112a: High pressure side connection pipe

112b: Low pressure side connection pipe

113: refrigerant and refrigeration oil reversal check valve

114: high pressure side connection piping service valve

115: high pressure connection hose assembly

116: low pressure side pipe connection tee

117: low pressure side pressure relay

118: low pressure side connection piping service valve

119: low pressure side connecting hose assembly

120: high-pressure side service valve of the vehicle mounting refrigeration unit assembly

121: low pressure side service valve of the vehicle mounting refrigeration unit assembly

122: liquid separator of the vehicle-mounted refrigeration unit assembly

123: suction tee connection oil recovery tee

124: oil separator of the vehicle-mounted refrigeration unit assembly

125: AC power hermetic compressor

126: Car mounting case

127: receiver dryer of the vehicle-mounted refrigerant amount control device

128a, 128b: Receiver tank of refrigerant amount control device for vehicle mounting

129a, 129b, 129c, 129d, 129e: refrigerant amount control valve

130: supercooling display window of the vehicle-mounted refrigerant amount control device

131: DC power defrost solenoid valve for refrigeration vehicle

150: AC power compressor ON / OFF switch of the vehicle control electric vehicle assembly

151: Regulator Power ON / OFF Switch

152: manual defrost switch

153: temperature and defrost regulator of the electrical control unit assembly

154: voltage drop transformer of the electrical control unit assembly

155: DC 12V stop

156: AC power output terminal

157: DC power output terminal

158: Car mounting case

170: 220V AC power

200: magnet contact relay of the electric control unit assembly

201: AC power compressor overheat protection relay of vehicle mounted refrigeration unit assembly

202: AC power compressor AC motor of vehicle-mounted refrigeration unit assembly

203: regulator power supply

204: Freezer Temperature Sensing Thermistor

205: defrost control relay of the electrical control unit assembly

206: connection point between the auxiliary circuit of the refrigeration unit and the electric circuit of the evaporator fan of the refrigeration vehicle

207: connection point between the auxiliary circuit of the refrigeration unit and the electric circuit of the condenser fan of the refrigeration vehicle

208: connection point between the electric circuit of the auxiliary refrigeration system and the electric circuit of the defrost solenoid valve of the refrigeration vehicle

500: high pressure side refrigeration piping

501: Belt Driven Compressor

501a, 602, 708a: compressor discharge port

501b, 603, 708b: Compressor Inlet

502: condenser

503: Receiver Dryer

504 expansion valve

505: Evaporator

506: differential pressure detection line

507: low pressure side refrigeration piping

510, 604: Magnetic Clutch

511, 606, 713: driving belt

512: refrigeration vehicle engine

600: high pressure side connection pipe

601: low pressure connection pipe

605: second belt drive compressor

607: AC motor

608: power box

609, 714: AC power

610: second compressor drive device

707: DC power compressor

708: scroll compressor

709 DC motor

710: the stop

711: power electronic switch

712: Alternator

In order to achieve the above object, in the present invention, an AC power refrigeration compressor assembly for compressing a refrigerant gas and recovering and storing refrigeration oil, and a connecting pipe kit for connecting the main vehicle refrigeration pipe to a refrigeration vehicle, a main refrigeration system and an auxiliary refrigeration An auxiliary refrigeration system for refrigeration vehicle mounting comprising a refrigerant amount adjusting device for selectively controlling the amount of refrigerant in the system, and an electric controller combination for controlling and controlling the operation of the auxiliary refrigeration system.

When the AC power auxiliary refrigeration system is operated, the refrigerant is compressed and discharged into a refrigerant gas of high temperature and high pressure in the AC power compressor. At this time, the refrigeration oil is separated from the oil separator and returned to the suction side of the compressor to be introduced into the compressor. The refrigerant gas flows into the condenser through the high pressure side connecting hose assembly of the connecting pipe kit connected to the high pressure side service valve and the high pressure side refrigeration pipe of the main refrigeration system connected thereto. The refrigerant in the condenser is discharged to a high-pressure liquid state and the refrigerant amount is controlled through the refrigerant amount control device, and then the refrigerant is converted into a low temperature and low pressure refrigerant in the expansion device, and flows into the evaporator to absorb heat inside the freezer. Therefore, at the evaporator outlet, the refrigerant becomes a refrigerant gas of low temperature and low pressure, and flows into the liquid separator of the refrigeration compressor assembly through the low pressure side connection hose assembly of the connecting pipe kit connected to the low pressure side refrigeration pipe, and only the gaseous refrigerant is sucked into the compressor. .

In the present invention, the AC power refrigeration compressor assembly functions to compress the refrigerant of low temperature and low pressure into a refrigerant gas of high temperature and high pressure, and may also apply semi-hermetic compressor or variable speed compressor in addition to the hermetic compressor. Can be. Among them, the AC power hermetic compressor which has higher refrigeration efficiency than the belt driven compressor is applied, and the oil compressor and liquid separator, which are additional compressor protection devices, are incorporated in consideration of the use environment of the refrigeration compressor. It consists of a high pressure pressure relay and a low pressure pressure relay to prevent excessive high pressure rise and low pressure drop. And it is built in the vehicle mounting case so that the devices can be easily mounted on the vehicle, and the service valve or solenoid valve is attached to the discharge side and the suction side, respectively, so that the connection pipe kit can be conveniently connected and separated from the vehicle if necessary. Has

The connecting pipe kit connects the refrigeration pipe of the main refrigeration system and the refrigeration compressor combination of the auxiliary power refrigeration system of AC power, and is equipped with a check valve as a protection device to maintain the durability and safety of the refrigeration system. In addition, the high-pressure connection pipe and the low-pressure connection pipe with the service valve or the solenoid valve are connected to the high-pressure connection hose assembly and the low-pressure connection hose assembly with flexibility, respectively, to increase convenience in vehicle installation.

In addition, the refrigerant amount adjusting device is a device for solving the reduction in the refrigeration performance caused by the difference between the refrigerant discharge flow rate and the filling amount between the main refrigeration unit using a belt-driven compressor and the auxiliary refrigeration unit operated by the AC power sealed compressor, 2 -Four receiver tanks are connected in parallel to the receiver dryer, and manual or solenoid valves are installed at the inlet and outlet connectors so that the refrigerant is selectively stored in each receiver tank when the vehicle's main refrigeration system is operating. In this operation, the refrigerant in the receiver tank is recovered again to control the amount of refrigerant in the main refrigeration system and the auxiliary refrigeration system. If a single receiver tank is used without using multiple receiver tanks, a receiver tank with variable capacity may be applied.

The electric controller combination controls the temperature inside the freezer and electrically controls the fans and defrost solenoid valves of the condenser and evaporator to maintain the performance of the freezer and to selectively perform various functions. The combination incorporates a transformer and rectifier capable of generating 12V DC at the same time as a magnet contact relay that starts the power to drive the AC compressor from an AC power source. And it consists of a controller for controlling the temperature of the freezer and a selection switch or relay for selectively performing various functions, it is characterized in that each component is built in the case for vehicle mounting.

Based on the accompanying drawings an embodiment of the AC power auxiliary refrigeration system according to the present invention will be described as follows.

AC auxiliary auxiliary refrigeration system according to the present invention is connected in parallel to the main refrigeration system of the vehicle as shown in FIG. The main refrigeration system of the vehicle is configured as follows.

Refrigeration piping 500, belt driven compressor 501, condenser 502, expansion device 504

Evaporator 505, differential pressure sensing line 506, magnetic clutch 510, drive belt 511

Engine 512, Defrost Solenoid Valve 131

Among them, the refrigeration pipe 500, the condenser 501, the expansion device 504, the evaporator 505, the defrost solenoid valve 131 is shared with the AC power auxiliary refrigeration system. The AC power supply refrigeration system consists of four parts as shown in FIG.

Refrigeration and compression unit assembly (101), connecting piping kit (100)

Refrigerant amount control device 103, electric control device assembly 102

In order to form a refrigeration cycle of the AC power assisted refrigeration system, the refrigeration compressor assembly 101 compresses the refrigerant into a gas state of high temperature and high pressure to generate a driving force capable of forming a refrigeration cycle. The refrigerant gas of high temperature and high pressure flows into the condenser 502 through the high pressure side connecting hose assembly 115, the high pressure side connecting pipe 112a, and the pipe 500 of the main refrigerating device, and is cooled therein to obtain a high pressure subcooled liquid. Changed to refrigerant. The liquid refrigerant is displayed in the subcooled state by the display window 130 through the refrigerant amount adjusting device 103 and then flows into the expansion device 504 to be changed into a low temperature low pressure refrigerant. The low temperature refrigerant flows into the evaporator 505 and absorbs heat inside the freezer to become a low pressure refrigerant gas, and then the low pressure side connecting pipe 112b and the low pressure side connecting hose assembly 119 to provide a refrigeration compressor assembly 101. Return to).

The refrigeration compressor assembly 101 is a single-phase AC power hermetic compressor (125) and the oil separator (124) and the suction pipe connection tee (123) for separating the refrigerant oil flowing out with the refrigerant from the discharge side of the compressor to recover to the suction side of the compressor. , The high pressure side service valve 120 and the low pressure side service valve for separating the liquid from the refrigerant flowing into the compressor 122, the combination 101, or connecting to the connection pipe kit 100. 121), the high pressure pressure relay 111 and the low pressure pressure relay 117 to protect the compressor when the operating pressure of the auxiliary refrigeration system is out of the set high and low pressure, and protects each component from the vibration and shock of the vehicle and And a case 126 for mounting.

In the refrigeration compressor assembly 101, the refrigerant gas discharged at a high temperature and high pressure as shown in FIG. 3 flows into the oil separator 124, where the refrigerant oil discharged together with the refrigerant is separated and connected to the suction side of the compressor 123. It is fed back into the compressor 125 is returned. The refrigerant passing through the oil separator 124 is introduced into the high pressure side connection pipe kit 100 through the high pressure side service valve 120.

The low pressure refrigerant passing through the evaporator 505 in the low pressure pipe of the compressor 125 flows into the liquid separator 122 through the low pressure side service valve 121. Among the incoming refrigerant, the liquid is separated from the liquid separator 122 and only the refrigerant in the gaseous state is sucked into the compressor 125. As the temperature of the freezer is lowered to 0 degrees or less, a frost is formed on the evaporator and the heat exchange amount is drastically reduced, so that the superheat of the refrigerant at the outlet of the evaporator is lowered, thereby increasing the possibility of the liquid refrigerant being sucked into the compressor. In order to ensure durability of the compressor from such use conditions, the liquid separator 122 is installed.

In addition, in the auxiliary refrigeration system using the AC power hermetic compressor, the oil separator 124 prevents a sudden drop of the oil level of the refrigeration oil in the compressor to maintain the compression performance. Rapid deceleration and acceleration during driving of the vehicle, or vertical impact due to unevenness of the road, cause the oil level inside the compressor to become unstable. Unlike the belt-driven compressor 501, in general, the compression performance and durability of the hermetic compressor is closely related to the stability of the oil level. As the evaporation temperature of refrigeration vehicles is generally about -15 to -10 degrees Celsius, the lowering of the oil surface caused by the decrease of recoverability of the frozen oil caused by the lower evaporation temperature, Overlapping, the compressor performance is drastically reduced. In order to prevent this, an oil separator is installed on the discharge side of the compressor so that the refrigerant oil is smoothly recovered to the compressor through a pipe connection tee connected to the suction line of the compressor.

When the refrigerant pressure of the AC power auxiliary refrigeration system is higher than the set pressure, the high-pressure pressure relay 111 cuts off the power of the compressor 125, the condenser 502, and the evaporator 505 to protect the refrigeration system. On the contrary, the low pressure relay protects the refrigeration system from the seizure caused by the compressor's deterioration of lubrication caused by the overload of the compressor or the low pressure being excessively low, even when the pressure is lower than the set pressure.

Connection pipe kit 100 is a high-pressure side connection pipe (112a) and low-pressure side connection pipe (112b) for connecting the auxiliary refrigeration unit to the refrigeration pipe (500) of the main refrigeration unit, these connection pipes and the refrigeration compressor combination 101 It is composed of connecting hose assembly (115, 119) for connecting. The high pressure side connection pipe (112a) is composed of a connection tee 110, a check valve 113, high pressure side service valve 114 is installed on the high pressure side pipe of the main refrigeration unit. Here, the check valve 113 is the high pressure side connecting pipe (112a), the high pressure side connecting hose assembly 115 and the refrigeration of the refrigerant and the refrigeration oil discharged from the belt-driven compressor 501 the moment the main refrigeration unit is started It is prevented from entering and accumulating in the oil separator 124 of the compressor assembly. Since the belt-driven compressor 501 is rapidly started by the magnetic clutch, the phenomenon that the refrigerant oil is discharged together with the refrigerant at the moment of starting is more severe than that of the hermetic compressor. When the refrigerant oil is discharged toward the expansion device 504, the refrigerant flows along the refrigerant and is recovered to the compressor 125. However, when the refrigerant oil is discharged toward the high pressure side connecting pipe 112a, the refrigerant oil of the compressor 502 is gradually lost and compressed. Performance and durability deteriorate. By installing the check valve in the high pressure side connecting pipe 112a as shown in FIG. 3, the flow of the refrigerant and the freezing oil is maintained only in the direction of the expansion device 504, thereby preventing the freezing oil from escaping from the belt driven compressor 501. Maintain a fixed level of freezing oil in the freezer.

Refrigerant amount control device 103 serves to adjust the amount of refrigerant in the main refrigeration unit and the AC power auxiliary refrigeration unit. Both refrigerant circuits have different lengths of the refrigerating pipes, as well as the refrigerant circulation amount. The belt-driven compressor 502 of the main refrigeration system is three times more discharged per revolution than the hermetic compressor 125 of the subsidiary refrigeration system, and the cooling capacity is larger than that of the subsidiary refrigeration system to which the hermetic compressor is applied. In addition, the size and cooling capacity of the condenser 502 is designed to match the cooling capacity and the refrigerant discharge amount of the belt-driven compressor 502, so that the auxiliary refrigeration unit is connected to a relatively large condenser and the refrigerant circulation amount is low. Refrigerant flow becomes unstable. In the case of the auxiliary refrigeration system, in order to stabilize the refrigerant circulation, more refrigerant is charged than the main refrigeration system to stabilize the refrigerant flow at the inlet of the expansion device and to increase the high pressure to secure the subcooling. However, the amount of refrigerant filling mainly in the auxiliary refrigeration system is excessively increased the high pressure with the amount of refrigerant exceeding the proper amount in the main refrigeration unit to lower the freezing capacity.

In order to solve this problem, the receiver dryer 127 and the receiver tanks 128a and 128b connected in parallel to the outlet of the condenser 502 and the inlet of the expansion device 504, the refrigerant amount control valves 129a, 129b, 129c, 129d, A refrigerant amount control device consisting of 129e and the display window 130 is installed as shown in FIG. The refrigerant passing through the condenser 502 flows through the receiver dryer 127 by closing only the refrigerant amount control valve 129a and closing the remaining refrigerant amount control valves 129b, 129c, 129d, and 129e while the auxiliary refrigeration system is operated. Auxiliary refrigeration system is operated in such a state as to make it possible, and the refrigerant in the display window becomes a liquid phase and the refrigerant is charged to make a stable refrigeration cycle. In this state, the auxiliary refrigerating device can maintain stable operation. However, when the main refrigeration system is operated by operating the belt driven compressor 501, the refrigerant discharge amount is high, so the high pressure is excessively increased. To prevent this, the refrigerant amount control valves 129d and 129e are opened and the refrigerant amount control valve 129b, By adjusting the opening degree of 129c, a portion of the refrigerant is stored in the receiver tanks 128a and 128b to prevent the high pressure rise and maintain the freezing performance.

When the main refrigeration unit is stopped and the auxiliary refrigeration unit is operated again, the refrigerant stored in the receiver tanks 128a and 128b needs to be recovered and reduced to the amount of refrigerant held in the original auxiliary refrigeration unit. To this end, the refrigerant flows in the direction of the receiver dryer 127 in a state where the refrigerant amount control valves 129d and 129e are closed. At this time, the refrigerant amount control valve 129a at the outlet of the receiver dryer 127 is throttled to receive the receiver tanks 128a and 128b. The outlet pressure is kept below the pressure inside the tank and the refrigerant volume control valve is opened to recover the refrigerant in the tank. After the recovery operation is completed, the refrigerant amount control valves 129b and 129c at the tank outlet are closed and the refrigerant amount control valve 129a at the outlet of the receiver dryer 127 is opened.

The electric controller combination controls the temperature inside the freezer and electrically controls the fans and defrost solenoid valves of the condenser and evaporator to maintain the performance of the freezer and selectively perform various functions. The combination includes a transformer and a rectifier capable of generating 12V DC at the same time as a magnet contact relay that starts the power for driving the AC compressor from a single-phase AC power source. And it consists of a controller for controlling the temperature of the freezer and a selection switch or relay for selectively performing various functions, it is characterized in that each component is built in the case for vehicle mounting.

The electrical control assembly 102 is a combination of electrical devices and components that regulate and control the operation of the AC power auxiliary refrigeration system. The main functions are ON / OFF control of the AC power compressor 125, ON / OFF control of the condenser 502 and evaporator 505 fans, freezer temperature control, defrost function control, and the like.

AC power compressor ON / OFF switch 150 for starting and stopping the AC compressor by starting the magnet contact relay 200 and outputting the single-phase AC power as shown in FIG. 3 and FIG. AC power compressor by comparing the freezer temperature detected by the regulator power ON / OFF switch 151, manual defrost switch 152, and temperature sensing thermistor 204 with the set target temperature. Adjusting the freezer internal temperature by automatically turning on / off the 125 or the controller 153 which automatically performs the defrost function according to the set defrost cycle and defrost time, the voltage which changes the 220V AC power 170 to 12V AC. Dropping transformer 154, stop 155 for generating direct current 12V power from AC 12V, AC power output terminal 156 for outputting power for AC power compressor 125, DC power output terminal 157, car Mounting case 158, the overheat protection relay 201 installed in the AC power compressor 125, the compressor AC motor 202, regulator 153 power supply 203, defrost control relay 205, Connection point 206 with the electric circuit driving the evaporator fan of the main refrigeration unit, Connection point with the electric circuit driving the condenser fan of the main refrigeration unit 207, Connection point with the defrost solenoid valve of the main refrigeration unit with the driving electric circuit 208.

A circuit diagram of the electrical control assembly 102 is shown in FIG. When the regulator power switch 151 is turned on, the AC power supply 170 is supplied to the regulator power supply 203 to input various control set values to the regulator 153, and at the same time, the temperature inside the freezer is a temperature sensing thermistor 204. Is displayed through. When the AC power compressor switch 150 is turned ON and the current temperature of the freezer is lower than the compressor OFF set temperature of the regulator 153, the a1 start terminal of the magnet contact relay 200 is turned on through the contacts 4 and 5 of the regulator 153. . Therefore, the AC power compressor can be started only when the contacts of various relays for protection devices such as the high pressure pressure relay 111, the low pressure pressure relay 117, and the compressor overheat protection relay 210 are all connected. When the compressor switch 150 is turned off or the contacts 4 and 5 of the regulator are not connected, the compressor 125 cannot be started. Likewise, the compressor will not start if any component of the protective relays, including regulator contacts 4 and 5, is not connected.

At the same time as the compressor 125 is started, DC12V is generated through the voltage drop transformer 154 and the stop value 155, and the fan of the condenser 502 and the evaporator 505 is started. The fan of the evaporator 505 is a terminal of the defrost control relay 205 when the manual defrost switch 152 is in the OFF state and when the terminal 2 and the terminal 3 are connected because the defrost function of the regulator 153 is not activated. The relay is started through 7, and DC12V is supplied from terminal 3 to terminal 1 to start the evaporator 505 fan.

When the manual defrost switch 152 is turned on, the defrost solenoid valve 131 is turned on to open the valve, and the high temperature and high pressure refrigerant gas flows into the evaporator 505 to melt and remove frost on the surface of the heat exchanger. In this case, when the fan of the evaporator 505 is operated, the temperature of the refrigerant gas is lowered, which increases the time required for defrosting, and thus the fan of the evaporator 505 must be stopped. Therefore, when the defrost function is activated, the starting power is stopped at terminal 7 of the defrost control relay 205 and the supply of DC12V to terminal 1 is also stopped, and the fan of the evaporator 505 is stopped.

In order to operate the AC power assisted refrigerating apparatus by automatic operation, the compressor OFF temperature is set in the controller 153. When the temperature sensing thermistor 204 senses the temperature inside the freezer and the temperature is higher than the set compressor OFF temperature, the terminals 4 and 5 of the regulator 153 remain connected to the starting state of the magnet contact relay 200. By maintaining the operation of the AC power compressor 125 is continued. The supply of DC12V is continued to maintain the operation of the evaporator 505 and condenser 502 fans. If the temperature of the freezer is lower than the compressor OFF set temperature due to the continuous refrigeration, the connection between terminals 4 and 5 of the regulator 153 is disconnected to stop the operation of the compressor 125, the condenser 502 and the evaporator 505. .

For the automatic defrosting operation, the defrosting period (time interval during which defrosting is performed, for example, 1 hour) and the defrosting time (for example, 6 minutes of defrosting function operation time) are set in the controller 153. When the time indicated by the timer of the controller 153 is determined to be a defrost cycle, terminals 2 and 3 of the controller 153 are disconnected to cut off power to terminal 7, which is a start terminal of the defrost control relay 205, thereby allowing the evaporator 505 through the terminal 1 to be removed. ) The fan stops operating. When the terminals 1 and 3 are connected, when the manual defrost switch 152 is in the OFF state, the power supplied to the terminal 5 of the defrost control relay 205 is connected to the terminal 8 to turn on the defrost solenoid valve 131. This operation state is maintained for the defrost time and when the defrost time elapses, the connection of the terminals 1, 3 of the regulator 153 is cut off, and the connection between the terminals 2, 3 is started again, and the defrost solenoid valve 131 returns to the OFF state. In addition, the evaporator 505 fan is restarted.

The operation sequence and method of the AC power auxiliary refrigeration apparatus according to the present invention is shown in FIG. 5 and operated in the following order.

Step 1: To operate the AC power auxiliary refrigeration system, first turn off the vehicle refrigeration system by stopping the operation of the vehicle.

Step 2: Then open the high pressure side service valve 114 and the low pressure side service valve 118 of FIG. 3 so that the piping of the main refrigeration system is connected with the piping of the refrigeration compressor assembly of the auxiliary refrigeration system.

Step 3: Turn on the regulator power switch of the electrical control assembly and enter the temperature T _OFF (target temperature of the freezer: eg -15 degrees) at which the compressor is turned off.

Step 4: Enter the defrost cycle t _DEF (temporal cycle in which the defrost function is repeated: 1 hour).

Step 5: Enter the defrost time △ t _DEF (Time for which the defrost function is automatic: Yes 6 minutes).

Step 6: The AC power compressor switch is turned ON to operate the compressor 125, condenser 502, and evaporator 505 fans of the auxiliary refrigeration system, and the defrost solenoid valve is kept in the OFF state (closed state).

Step 7: When the internal temperature T of the freezer is lower than that of the compressor, the operation of the AC power compressor 125, the condenser 502 and the evaporator 505 is stopped. If it is high, operation continues until the internal temperature reaches the target temperature ( T _OFF ).

Step 8: When the timer ON time of the regulator reaches the defrost cycle t _DEF , the defrost solenoid valve 131 is turned on to open the valve and to stop the operation of the fan of the evaporator 505. If it is before reaching the defrost cycle, the state of "Sequence 6" is maintained (the defrost solenoid valve 131 is OFF and the evaporator 505 fan is ON).

Step 9: stopping the defrosting the solenoid valve 131 is operated in the time after the ON defrost is performed (△ t) is does not have the set defrost time △ t _DEF defrost solenoid valve 131 is ON, the evaporator 505, a fan If it is exceeded, it returns to the state of "Sequence 6" (defrost solenoid valve 131 is OFF and evaporator 505 fan is ON). That is, the AC power compressor switch is turned on to operate the compressor 125, the condenser 502, and the evaporator 505 fan of the auxiliary refrigerating device, and the defrost solenoid valve is maintained in the OFF state (closed state).

Step 10: If the manual defrost switch is turned off after "Step 6" (the defrost solenoid valve 131 is OFF and the evaporator 505 fan is ON), the defrost function is set according to the input value of the controller. 7 "and" Step 8 "are automatically controlled. In the ON state, the manual defrost function is performed regardless of the set value input to the regulator to turn on the defrost solenoid valve 131 and the evaporator 505 fan is stopped.

Step 11: While the AC power compressor is switched off, the operation of the compressor 125 of the refrigerating device is stopped, and the fan of the condenser 502 and the evaporator 505 is also stopped, and the defrost solenoid valve 131 is turned off (closed). do.

Step 12: Turn OFF the AC power switch to cut the power of the controller.

The present invention intends to achieve the following effects by presenting such a new AC power auxiliary refrigeration system for refrigeration vehicles.

Even when the engine of the refrigeration vehicle is stopped, the auxiliary refrigeration unit operated by an external commercial AC power source can be operated to maintain and manage the load temperature in accordance with the standard. Therefore, even in case of refrigerated vehicles carrying large loads, even if temporary storage or night parking is inevitable, the temperature of frozen foods can be maintained without the inconvenience of having to reload the load into the freezer every day.

By applying the AC power hermetic compressor, it is possible to maintain higher thermal efficiency than the refrigeration system driven by the AC motor (prior art of FIG. 1) or the prior art operated by the engine and the alternator during night parking or temporary storage. have.

Condenser, evaporator, expansion device and refrigeration piping, which are the main components of the refrigeration system, can be shared with the main refrigeration system of the vehicle and can be easily mounted on the vehicle body, improving installation convenience and improving the performance of the refrigeration system. Durability is also improved.

Therefore, the durability of the compressor is increased by incorporating the oil separator 124 and the liquid separator 122, which are additional compressor protection devices in consideration of the high efficiency hermetic compressor and the use environment, and the refrigeration piping of the main refrigeration unit and the auxiliary power refrigeration unit of the AC power supply 101 ) Can be connected to the connection pipe (112a, 112b) and the flexible connecting hose assembly (115, 119) while maintaining the durability and safety of the auxiliary refrigeration apparatus.

The refrigerant amount adjusting device 103 can prevent the decrease in freezing performance caused by the difference between the refrigerant discharge flow rate and the filling amount between the main refrigeration device and the auxiliary refrigeration device, and improve the performance. In addition, the vehicle mounting electric control unit assembly 102 of the AC power auxiliary refrigeration apparatus can efficiently control the temperature inside the freezer and at the same time increase the convenience of use of the auxiliary refrigeration system.

Claims (19)

In a refrigerating device using a belt driven compressor driven by the engine power of a refrigeration vehicle, the refrigerant is compressed to high temperature and high pressure by a refrigeration compressor assembly 101 driven by an external AC power even when the engine is stopped, It is introduced into the condenser through the side connecting pipe kit to become a high pressure liquid refrigerant, and after the refrigerant amount is adjusted while passing through the refrigerant amount control device, the refrigerant is changed into low temperature and low pressure in the expansion device, and flows into the evaporator, and absorbs heat inside the freezer to absorb low pressure refrigerant. An auxiliary power supply refrigeration system for vehicle mounting, comprising: an auxiliary refrigeration apparatus for forming a refrigeration cycle by being sucked back into the refrigeration compressor assembly through the low pressure side connecting pipe kit, and an electric controller combination controlling the gas. The oil separator of claim 1, wherein the refrigerant is compressed by applying an AC power hermetic compressor, the oil separator separating and recovering the refrigerant oil discharged with the refrigerant, the liquid separator separating the liquid refrigerant introduced into the suction port of the compressor, High pressure pressure relay, low pressure pressure relay to control refrigerant pressure of low pressure side, refrigerant compression device combination consisting of high pressure side service valve connected through piping and connecting pipe of vehicle refrigeration system and vehicle mounting case equipped with low pressure side service valve AC power auxiliary refrigeration system for vehicle mounting. The auxiliary power supply refrigeration system for vehicle mounting according to claim 2, wherein the high pressure side service valve and the low pressure side service valve are solenoid valves. 3. The vehicle-mounted AC power auxiliary refrigeration system according to claim 2, wherein the compressor is an AC power semi-hermetic compressor. The auxiliary power supply refrigeration system for vehicle mounting according to claim 2, wherein the compressor is a variable speed compressor. The low pressure side service of claim 1, wherein the high pressure side service pipe connecting the high pressure side service valve of the refrigeration compressor assembly to the high pressure side pipe of the vehicle refrigeration system, the high pressure side service valve and the high pressure side connection hose combination, and the low pressure side service of the refrigeration compressor assembly Connection piping kit consisting of a low pressure side connection pipe for connecting the valve to the low pressure side pipe of the vehicle refrigeration system, a low pressure side service valve, a low pressure side connection hose assembly, and a check valve for preventing refrigeration oil installed on the high pressure side connection pipe (100 AC power auxiliary refrigeration system for vehicle mounting. The auxiliary power supply refrigeration system for vehicle mounting according to claim 6, wherein the high pressure side service valve of the high pressure side connection pipe and the low pressure side service valve of the low pressure side connection pipe are solenoid valves. The auxiliary power supply auxiliary refrigeration system for vehicle mounting according to claim 6, wherein the high pressure side connection hose assembly and the low pressure side connection hose assembly are flexible rubber hoses. According to claim 1, wherein the apparatus for adjusting the amount of refrigerant between the main refrigeration unit of the vehicle and the auxiliary refrigeration unit operated by the AC power compressor, the 2-4 receiver tanks and the control in parallel installed in the piping formed by the receiver dryer and the refrigerant amount control valve An auxiliary power supply refrigeration system for vehicle mounting, comprising a refrigerant amount adjusting device (103) comprising a combination of valves and a subcooling display window for displaying the subcooling degree of the refrigerant installed at the inlet of the expansion device. The vehicle-mounted AC power auxiliary refrigeration system according to claim 9, wherein the refrigerant amount control valve is a solenoid valve. The vehicle-mounted AC power auxiliary refrigeration system according to claim 9, wherein the receiver tank is a variable capacity tank. The method of claim 1, wherein a DC power supply formed of a rectifier and a rectifier capable of generating a DC 12V from a single-phase 220V AC power source, a magnet contact relay for starting power for driving an AC compressor, and controlling a temperature inside a freezer. Consists of a selector switch and a relay to selectively control the fan and defrost solenoid valves of the condenser and the evaporator to selectively perform the function of the auxiliary refrigeration system, and an electric control unit assembly (102) incorporating each component in a case for vehicle mounting. AC power auxiliary refrigeration system for vehicle mounting. 13. The relay according to claim 12, wherein an overheat protection relay, an electric motor circuit, a low pressure pressure relay and a high pressure pressure relay of the compressor are installed in series with the output terminal of the magnet contact relay, and all the relays are connected by being activated by a selection switch. And an AC power auxiliary refrigeration system for a vehicle configured to operate the compressor only when the compressor power relay of the regulator is connected. 13. The fan of the evaporator and condenser according to claim 12, wherein the magnet contact relay is operated by installing a DC power supply in parallel to the output terminal of the magnet contact relay and the magnet contact relay is activated by the compressor power relay of the selector switch and the regulator. A vehicle-mounted AC power assisted refrigeration system configured to operate simultaneously and to stop the fan when the compressor is stopped. 13. The control circuit according to claim 12, wherein the selection switch, the DC relay, and the defrost relay of the regulator are connected to the output circuit of the DC power supply, and the ON switch is used to manually turn on the defrost solenoid valve and simultaneously stop the evaporator fan. An auxiliary power supply refrigeration system for vehicle mounting, characterized in that the defrost relay is connected to automatically turn on the solenoid valve and stop the evaporator fan at the same time. (1) Turn off the vehicle refrigeration unit. (2) Turn on the regulator power switch (3) Input the temperature at which the compressor is turned off (4) input the defrost cycle (5) Enter the defrost time (6) Turn on the AC power compressor switch to operate the compressor, condenser and evaporator fans of the subsidiary refrigeration unit, and keep the defrost solenoid valve off. (7) If the internal temperature of the freezer is lower than the compressor's OFF temperature, the AC power compressor, condenser and evaporator fans are deactivated. If the internal temperature is high, the operation is continued until the internal temperature reaches the target temperature. (8) When the timer ON time of the controller reaches the defrost cycle, turn on the defrost solenoid valve to open the valve and stop the operation of the evaporator fan.If it does not reach the defrost cycle, the state of the sequence "(6)" (defrost solenoid Valve is OFF and the evaporator fan is ON) (9) If the time for defrosting after the defrost solenoid valve is turned on does not reach the set defrost time, turn on the defrost solenoid valve and keep the operation of the evaporator fan stopped. The solenoid valve is turned OFF and the evaporator fan is turned ON) .The AC power compressor switch is turned ON to operate the compressor, condenser and evaporator fans of the auxiliary refrigeration system, and the defrost solenoid valve is kept OFF. (10) If the manual defrost switch is turned off after the sequence "(6)" (the defrost solenoid valve is OFF and the evaporator fan is ON), the defrost function is set according to the input set value of the controller. If it is in the ON state, the manual defrost function is executed regardless of the set value input to the regulator, and the defrost solenoid valve is turned ON, and the evaporator fan is stopped. (11) While the AC power compressor switch is OFF, the operation of the compressor 125 of the refrigerating device is stopped and at the same time the fan of the condenser 502 and the evaporator 505 is also stopped, and the defrost solenoid valve 131 is turned OFF. (12) A method for operating an auxiliary refrigeration system, which comprises turning off the AC power switch to turn off the power to the regulator. 17. The method of claim 16, wherein the defrosting function is performed by sensing the temperature and pressure of the evaporator outlet. 17. The method of claim 16, wherein the defrosting time is increased or decreased by sensing outside temperature and humidity. 17. The method of claim 16, wherein the rotational speed of the compressor is adjusted by detecting a difference between the outside temperature and the internal temperature of the freezer.