JPH0671855B2 - Package type rooftop vehicle cooling system - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a package-type rooftop-mounted vehicle cooling device in which a refrigerant condenser, a refrigerant evaporator, and the like mainly used in a bus vehicle are unitized.

[Prior Art] A large vehicle having a large passenger compartment such as a bus vehicle is provided with a cool air duct having a plurality of cool air discharge ports extending in the front-rear direction on both left and right sides of the vehicle, and the cold air duct is cooled by a cooling device. By introducing air, cool air is distributed throughout the large passenger compartment.

Conventionally, as shown in FIG. 7 and FIG. 8, one refrigerant compressor 1, refrigerant condensers 21 and 22, pressure reducing device 3, refrigerant evaporator 41,
There is a vehicle cooling device that includes a refrigeration cycle configured by 42, a receiver 51, a dryer 52, and a refrigerant pipe 6 that connects them, and is housed in a cooler case 7. The cooler case 7 includes a condenser cooling air introduction port 71, a condenser cooling air outlet 72, a cooling air introduction port 73, an inside air temperature thermistor TH0 provided in the cooling air introduction port 73, and front and rear directions on both left and right sides of the vehicle. Has a cool air outlet 741, 742 for introducing the cold air heat-exchanged with the refrigerant evaporator 41, 42 in both of the cold air ducts provided so as to extend, the refrigerant condensers 21, 22, the refrigerant condenser blower 20, the The refrigerant evaporators 41 and 42 and the refrigerant evaporator blower 40 are housed. However, in each case, the temperature inside the vehicle (hereinafter abbreviated as room temperature) is detected as a uniform temperature by one inside air temperature thermistor TH0 attached to the cooling air introduction port 73.

[Problems to be Solved by the Invention] As described above, the conventional package-type rooftop-mounted vehicle air conditioner has the following problems.

a) Since the room temperature is regarded as uniform and measured at one point, it is impossible to deal with a slight deviation in the room temperature caused by, for example, solar radiation on one side of the vehicle.

b) When the refrigerant evaporators are installed in parallel and the cold air that has undergone heat exchange of the respective refrigerant evaporators is introduced into the left and right cold air ducts, even if the room temperature is measured uniformly, both will be affected by variations in the internal resistance of the refrigerant evaporators. If the flow rate of the refrigerant flowing through the refrigerant evaporator is different and the left and right cooling capacities are different, fine adjustment cannot be performed.

c) The room temperature cannot be finely adjusted when there is a slight difference in heat load due to uneven distribution of passengers in the vehicle.

An object of the present invention is to provide a package-type rooftop-mounted vehicle air conditioner capable of automatically controlling the temperature in the vehicle compartment independently left and right.

[Means for Solving the Problems] In order to solve the above problems, a package-type rooftop-mounted vehicle air conditioner of the present invention is mounted on a refrigerant compressor driven by an engine and on the rooftop of the vehicle. Refrigerant condenser, decompression device, refrigerant evaporator, stored in the cooler case,
A cooling device including a left-side refrigerant evaporator blower for supplying cool air to the left side of the vehicle compartment, a right-side refrigerant evaporator blower for supplying cool air to the right side of the vehicle compartment, and a control device for controlling the blower. In the above, the control device includes a left temperature detecting means for detecting a left temperature inside the vehicle compartment and a right temperature detecting means for detecting a right temperature inside the vehicle compartment. It is configured to independently control the air flow rates of the air blower for the air conditioner and the air blower for the right side refrigerant evaporator.

[Operation] 1) The blower for the refrigerant condenser sucks the outside air from the heat exchange outside air introduction port of the cooler case, exchanges the sucked outside air with the refrigerant condenser, and exchanges the outside air with the refrigerant condenser into the cooler case. Discharge from the outside air outlet for heat exchange.

The left-side refrigerant evaporator blower sucks air from the cooling air inlet of the cooler case, exchanges the sucked air with the refrigerant evaporator, and exchanges heat with the refrigerant condenser to the left-side cool air outlet of the cooler case. Of the cold air ducts provided on both left and right sides of the vehicle, the air is guided to the left cold air duct and discharged from the cold air duct into the passenger compartment.

The refrigeration cycle is driven by the refrigerant compressor,
The refrigerant compressor compresses the refrigerant in the refrigeration cycle, the compressed refrigerant is heat-exchanged with the outside air sucked from the heat exchange outside air introduction port in the refrigerant condenser to be condensed, and the condensed refrigerant is expanded in the decompression device and decompressed. In the refrigerant evaporator, the refrigerant expanded by is heat-exchanged with the air sucked from the cooling air introduction port, and is again compressed by the refrigerant compressor.

The electric control device controls at least the air flow rate of the refrigerant evaporator of the refrigeration cycle in accordance with the output of the left temperature detecting means, and among the cold air ducts provided on the left and right sides of the vehicle by the above operation, one of the cold air ducts As a result, cold air corresponding to the temperature on the left side of the vehicle compartment is discharged.

2) The blower for the refrigerant condenser sucks the outside air from the heat exchange outside air inlet of the cooler case, exchanges the sucked outside air with the refrigerant condenser, and exchanges the outside air with the refrigerant condenser to the outside air for the heat exchanger of the cooler case. Discharge from the outlet.

The right-side refrigerant evaporator blower sucks air from the cooling air inlet of the cooler case, exchanges the sucked air with the refrigerant evaporator, and exchanges heat with the refrigerant evaporator, and the right-side cool air outlet of the cooler case. Of the cold air ducts provided on both left and right sides of the vehicle, the air is guided to the right cold air duct and discharged from the cold air duct into the passenger compartment.

When the refrigerant compressor is driven, the refrigerant compressor compresses the refrigerant in the refrigeration cycle, condenses the compressed refrigerant by exchanging heat with the outside air sucked from the heat exchange outside air inlet in the refrigerant condenser, and condensing. The refrigerant is expanded by the pressure reducing device, the refrigerant expanded by the pressure reducing device is heat-exchanged with the air sucked from the cooling air introduction port by the refrigerant evaporator, and then compressed again by the refrigerant compressor.

The electric control device controls at least the air flow rate of the evaporator of the right side refrigeration cycle according to the output of the right side temperature detecting means.

By the above operation, among the refrigerating ducts provided on both left and right sides of the vehicle, cool air corresponding to the temperature on the right side of the vehicle compartment is discharged from the right cool air duct.

[Advantages of the Invention] In the package-type rooftop-mounted vehicle air-conditioning apparatus of the present invention having the above-described configuration, the left-side refrigerant evaporator blower and the right-side refrigerant evaporator blower are provided with a left-side temperature detection means and a left-side temperature detection means. By independently controlling by the output signal of the temperature detecting means for the right side, A) the temperature inside the vehicle compartment can be automatically controlled independently on the left and right sides. As a result, the room temperature can be kept at a uniform temperature even when a slight twist occurs in the room temperature.

B) When the refrigerant evaporators are installed in parallel and the cold air that has undergone heat exchange of the respective refrigerant evaporators is introduced into the left and right cold air ducts, the flow rate of the refrigerant flowing to both refrigerant evaporators is changed due to the variation in the resistance inside the refrigerant evaporators. Differently, you can fine-tune even if the left and right cooling capacity is different.

C) Even if there is a slight difference in heat load due to uneven distribution of passengers in the vehicle, the room temperature can be finely adjusted.

[Embodiment] Next, a vehicle air conditioner of the present invention will be described based on an embodiment shown in the drawings.

FIG. 1 is a refrigeration cycle diagram of a vehicle air-conditioning apparatus according to the present invention, and FIGS. 2 and 3 are layout diagrams of a package-type roof-mounted vehicle air-conditioning apparatus in which the functional components of FIG. 1 are unitized. FIG. 4 is a top view showing the appearance of a package-type rooftop-mounted vehicle cooling device.

The refrigeration cycle applied to the present embodiment is a left-side refrigeration cycle 100 for cooling the left side of the passenger compartment in the vehicle traveling direction.
And a right side refrigeration cycle 200 that cools the right side of the vehicle interior in the vehicle traveling direction.

The left refrigeration cycle 100 includes a left side refrigerant compressor 11, a left side refrigerant condenser 21, a left side pressure reducing device 31, and a left side refrigerant evaporator.
41, a left receiver 511 and a left dryer 521, which are connected by a left refrigerant pipe 61.

The left side refrigerant compressor 11 is provided so as to be fastened to a running engine of a bus vehicle, and the rotational output of the engine is intermittently transmitted through the left side electromagnetic clutch 111 to compress the refrigerant.

The left-side refrigerant condenser 21 heats and cools the gaseous refrigerant that has been compressed by the left-side refrigerant compressor 11 and has a high pressure and a high temperature, to cool it by condensing and liquefying it. Left side refrigerant condenser 21
Is the left first refrigerant condenser 211 and the left second refrigerant condenser 2
12, consisting of a left supercooler 213. The left-side super cooler 213 is cooled by the left-side first refrigerant condenser 211 and the left-side second refrigerant condenser 212 discharged from the left-side dryer 521, further cools the condensed refrigerant, and supercools the liquid refrigerant ( Give super cool).

The left decompression device 31 is composed of a capillary tube, a constant pressure expansion valve, a temperature actuated expansion valve, and the like, and adiabatically expands the liquid refrigerant condensed by the left refrigerant condenser 21. The left-side refrigerant evaporator 41 evaporates the atomized refrigerant that has been adiabatically expanded by the left-side pressure reducing device 31 and has a low pressure and a low temperature, cools the air flowing into the vehicle interior, and cools the interior. The left receiver 511 separates the refrigerant discharged from the left first refrigerant condenser 211 and the left second refrigerant condenser 212 into a gas phase refrigerant and a liquid phase refrigerant, and discharges only the liquid phase refrigerant. Left dryer 521
Removes water contained in the liquid-phase refrigerant discharged from the left receiver 511.

The right side refrigeration cycle 200 includes a right side refrigerant compressor 12, a right side refrigerant condenser 22, a right side pressure reducing device 32, and a right side refrigerant evaporator.
42, a right side receiver 512 and a right side dryer 522, which are connected by a right side refrigerant pipe 62.

The right side refrigerant compressor 12 is provided by being fastened to a running engine of a bus vehicle, and the rotational output of the engine is intermittently transmitted via the right side electromagnetic clutch 122 to compress the refrigerant.

The right-side refrigerant condenser 22 heat-exchanges and cools the gaseous refrigerant that has been compressed by the right-side refrigerant compressor 12 and has a high pressure and a high temperature, to be condensed and liquefied. Right side refrigerant condenser 22
Is the first refrigerant condenser 221 for the right side, the second refrigerant condenser 2 for the right side
22 and right side super cooler 223. The right side super cooler 223 is cooled by the right side first refrigerant condenser 221 and the right side second refrigerant condenser 222 discharged from the right side dryer 522, further cools the condensed refrigerant, and supercools the liquid refrigerant ( Give super cool). Right side first refrigerant condenser 22
1 and the right side second refrigerant condenser 222 are provided in parallel.

The right decompression device 32 includes a capillary tube, a constant pressure expansion valve, a temperature actuated expansion valve, and the like, and adiabatically expands the liquid refrigerant condensed by the right refrigerant condenser 22. The right-side refrigerant evaporator 42 evaporates the mist-like refrigerant that has been adiabatically expanded by the right-side pressure reducing device 32 to have a low pressure and a low temperature, cools the air flowing into the vehicle interior, and cools the interior. The right receiver 512 separates the refrigerant discharged from the right first refrigerant condenser 221 and the right second refrigerant condenser 222 into a vapor phase refrigerant and a liquid phase refrigerant, and discharges only the liquid phase refrigerant. The right dryer 522 is
Moisture in the liquid-phase refrigerant discharged from the right receiver 512 is extracted.

A cooler case 7 is mounted on the roof of the bus vehicle. The cooler case 7 has a refrigeration cycle 10 for the left side inside.
The functional parts of the refrigeration cycle 200 for 0 and the right side are stored, and the evaporator unit U ₁ is placed in the front half (the left side in FIGS. 2 and 3) and the condenser unit is placed in the rear half with respect to the vehicle traveling direction. There is.

The evaporator unit U ₁ houses a left-side pressure reducing device 31, a right-side pressure reducing device 32, a left-side refrigerant evaporator 41, and a right-side refrigerant evaporator 42. Evaporator unit U ₁ is a left side refrigerant evaporator
41 and the air for indoor cooling are forcibly heat-exchanged, and four sirocco-type left-side refrigerant evaporator blowers 411, 412, 413, 414 for blowing the air after heat exchange into the vehicle compartment are housed. There is. Further, the evaporator unit U ₁ includes four sirocco-type right-side refrigerants for forcibly exchanging heat between the right-side refrigerant evaporator 42 and the air for indoor cooling, and blowing the heat-exchanged air into the vehicle interior. The evaporator blowers 421, 422, 423, 424 are stored.

The condenser unit U ₂ houses a left-side refrigerant condenser 21, a right-side refrigerant condenser 22, a left-side receiver 511, a right-side receiver 512, a left-side dryer 521, and a right-side dryer 522.
The condenser unit U ₂ houses three axial flow type left side refrigerant condenser blowers 214, 215 and 216 for forcibly exchanging heat between the left side refrigerant condenser 21 and the outside air. Further, the condenser unit U ₂ includes three axial flow type right side refrigerant condenser blowers 22 for forcibly exchanging heat between the right side refrigerant condenser 22 and the outside air.
It holds 4, 225 and 226.

In the cooler case 7, the evaporator unit U ₁ and the condenser unit U ₂ are partitioned by a partition wall.

In the cooler case 7 on the side of the condenser unit U ₂ , the condenser cooling air inlets 711, 712, 713 and the condenser cooling air outlet 7 are provided.
21 to 726 are provided. Cooling air inlet 711 for condenser
Sucks outside air that is heat-exchanged with the left first refrigerant condenser 211 and the right first refrigerant condenser 221. The condenser cooling air introduction port 712 sucks the outside air that is heat-exchanged with the left second refrigerant condenser 212 and the left super cooler 213. The condenser cooling air introduction port 713 sucks the outside air that is heat-exchanged with the right side second refrigerant condenser 222 and the right side super cooler 223. Cooling air outlets for condensers 721, 722, 72
3, the left-side refrigerant condenser blowers 214, 215, 216 suck in the condenser cooling air inlets 711, 712, and the left-side first refrigerant condenser 211, the left-side second refrigerant condenser 212, and the left-side super cooler. The outside air that has undergone heat exchange with 213 is discharged to the outside.
The condenser cooling air outlets 724, 725, 726 are the right side refrigerant condenser blowers 224, 225, 226, and the condenser cooling air inlets 7
The outside air that has been sucked from 11, 713 and has undergone heat exchange with the right first refrigerant condenser 221, the right second refrigerant condenser 222, and the right supercooler 223 is discharged to the outside.

The cooler case 7 on the side of the evaporator unit U ₁ has an outside air inlet 731 for cooling, an inside air inlet 732 for cooling, and a cold air outlet 74 for the left side.
1 and right side cold air outlets 742 are provided. The outside air introduction port 731 for cooling is for introducing outside air, an outside air filter 731A is provided downstream thereof, and an outside air introduction damper not shown is provided downstream of this outside air filter 731A. The inside air introduction port 732 for cooling introduces the air in the vehicle compartment. The outside air introduction port 731 for cooling is opened and closed by an outside air introduction damper (not shown) operated by a vehicle occupant. The left side cool air outlet 741 is the left side refrigerant evaporator blower 4
11, 412, 413, 414 are provided so that the air sucked from the cooling outside air introduction port 731 and the cooling inside air introduction port 732 and the heat exchanged with the left side refrigerant evaporator 41 is extended to the left and right sides of the vehicle in the front-rear direction. It guides to the left cold air duct 81 among the obtained cold air ducts. The right-side cold air outlet 742 is sucked by the right-side refrigerant evaporator blowers 421, 422, 423, and 424, and guides the air that has undergone heat exchange with the right-side refrigerant evaporator 42 to the right-side cold air duct 82 of the vehicle.
A large number of cold air outlets 81a, 82a are provided on the side surfaces and the lower surfaces of these cold air ducts 81, 82.

FIG. 5 shows an example of an electric control circuit for controlling the package-type rooftop-mounted vehicle cooling system according to the present invention.

Reference numeral 9 is an electric control circuit for controlling the vehicle cooling device.

AC ₁ is a left side cooler control circuit and controls the left side refrigeration cycle 100. AC ₂ is a right side cooler control circuit, and controls the right side refrigeration cycle 200. AV is a ventilation control circuit, which is operated by a vehicle occupant to open and close an outside air introduction damper (not shown). BA
T is a battery that is a power source for the vehicle. CB _{1 to} CB ₆ are
This is a circuit breaker that protects electrical equipment and devices by instantaneously breaking the circuit when an abnormal current flows. D ₁ is a diode, which allows current to flow in only one direction. EC ₁ is a left-side magnet coil that connects and disconnects the left-side electromagnetic clutch 111 of the left-side refrigerant compressor 11. EC ₂ is a right-side magnet coil that connects and disconnects the right-side electromagnetic clutch 122 of the right-side refrigerant compressor 12. EIu is an idle-up solenoid, which is energized when the left magnet coil EC ₁ and the right magnet coil EC ₂ are energized to increase the idle speed of the engine. FU _{1 to} FU ₈ are fuses, which cut off when an excessive current flows and automatically cut off the circuit to keep electrical equipment safe. FUp is a fuse for the power supply connected to the battery BAT. EBB is
It is a blower lamp and is a blower 411, 4 for the left side refrigerant evaporator.
12, 413, 414 and right side refrigerant evaporator blowers 421, 42
Lights up when 2, 423 and 424 are on. The LBC is a cooler lamp that lights up when the vehicle occupant operates the cooling system. LBp ₁ is a pressure abnormality lamp for the left side, and informs that the refrigerant pressure in the left side refrigeration cycle 100 is abnormal. LBp ₂ is a pressure abnormality lamp for the right side, and informs that the refrigerant pressure in the right side refrigeration cycle 200 is abnormal. MB _{1 to} MB ₄ are the left-side refrigerant evaporator blowers 411, 4
Blower motors of 12, 413 and 414. MB _{5 to} MB ₈ are blower motors 421, 422, 423, 424 for the right-side refrigerant evaporator blower. MC _{1 to} MC ₃ are blowers for the left side refrigerant condenser 21
It is a 4,215,216 blower motor. MC _{4 to} MC ₆ are blower motors of the right-side refrigerant condenser blowers 224, 225, and 226. The MV is a ventilation motor that drives an outside air introduction damper. RB _{1 to} RB ₄ are resistors that weaken the current supplied to the blower motors MB _{1 to} MB ₈ and delay the rotation speed. RTS
Is a control volume that sets the cooling capacity of the passenger compartment. RL _{1 to} RL ₁₀ are relays that switch the electric supply circuits of the blower motors MB _{1 to} MB ₈ . RL _{11 to} RL ₁₈ are relays that switch the electric supply circuits of the blower motors MC _{1 to} MC ₆ . The RL ₁₉ is a relay for controlling energization of the left magnet coil EC ₁ . RL ₂₀ is a right side magnet coil
A relay for power supply control of the EC _2. THI ₁ is a left inside air temperature detecting thermistor which is a temperature detecting means for the left side,
It is provided on the left side of the vehicle compartment and measures the temperature on the left side of the vehicle.In the present embodiment, it is installed at the middle position of the cold air outlet 81a on the side surface of the cold air duct 81 on the left side of the vehicle interior, and directly detects the air outlet temperature. It is considered not to do so. THI ₂ is
A right inside air temperature detecting thermistor that is a right temperature detecting means, is provided on the right side of the vehicle compartment, and measures the temperature on the right side of the vehicle.In this embodiment, on the side surface of the cold air duct 82 on the right side of the vehicle compartment. It is installed at an intermediate position of the cold air outlet 82a so as not to directly detect the outlet temperature. The THO ₁ is a left-side thermistor, which is provided on the left-side cold air outlet 741 side of the left-side refrigerant evaporator 41, and detects the occurrence of frost in the left-side refrigerant evaporator 41 by detecting the temperature of blown air. The THO ₂ is a thermistor for the right side, is provided on the right side cool air outlet 742 side of the right side refrigerant evaporator 42, and detects the occurrence of frost in the right side refrigerant evaporator 42 by detecting the temperature of the blown air. MT ₁ is a motor for the inside air temperature detecting thermistor for the left side, and supplies the air inside the vehicle left side to the inside air temperature detecting thermistor THI ₁ for the left side that detects room temperature. MT
₂ is a motor for the inside air temperature detection thermistor for the right side,
Supply the air on the right side of the passenger compartment to the inside air temperature detection thermistor THI ₂ for detecting the room temperature. SPC ₁ is a pressure switch for the left side, it is arranged in the refrigerant pipe 61 for the left side of the refrigerant discharge side of the refrigerant condenser 21 for the left side, the refrigerant pressure in the refrigerant condenser 21 for the left is not less than a set value. To turn on. SPC ₂ is a pressure switch for the right side, is arranged in the refrigerant pipe 62 for the right side on the refrigerant discharge side of the refrigerant condenser 22 for the right side, and the refrigerant pressure in the refrigerant condenser 22 for the right side is not less than a set value. To turn on. SPH ₁
Is a high pressure switch for the left side, provided in the left side refrigerant pipe 61 of the refrigerant inflow side of the left side refrigerant compressor 11, by the pressure of the refrigerant flowing into the left side refrigerant compressor 11 is set value or more. Turn on. SPL ₁ is a low pressure switch for the left side,
It is provided in the left-side refrigerant pipe 61 on the refrigerant discharge side of the left-side refrigerant compressor 11 and is turned on when the pressure of the refrigerant discharged from the left-side refrigerant compressor 11 is equal to or lower than a set value. SPH ₂ is a high pressure switch for the right side, is provided in the right side refrigerant pipe 62 on the refrigerant inflow side of the right side refrigerant compressor 12, the pressure of the refrigerant flowing into the right side refrigerant compressor 12 is set value or more. ON by
To do. SPL ₂ is a low pressure switch for the right side, which is provided in the right side refrigerant pipe 62 on the refrigerant discharge side of the right side refrigerant compressor 12,
It is turned on when the pressure of the refrigerant discharged from the right side refrigerant compressor 12 is set to be equal to or lower than a set value. SWB is a main switch and is set to a non-energized OFF contact, a contact L for setting the supply current of the blower motors MB _{1 to} MB ₈ , a contact M, a contact H, and any of the contacts A, L and H. It is provided with a contact C that is electrically connected and energizes the left cooler control circuit AC ₁ and the right cooler control circuit AC ₂ . SWC is a cooler switch that energizes the cooler control circuit AC ₁ for the left side and the cooler control circuit AC ₂ for the right side. SWV is a ventilation switch that energizes the ventilation control circuit AV and manually operates the ventilation motor MV. SWL is a vehicle interior light switch. N is
This is an alternator terminal that detects the power generation cycle of the alternator.

Set the main switch SWB so that the C contact is conductive,
Turning on the cooler switch SWC turns on the cooler lamp LBC, and the left cooler control circuit AC ₁ and the right cooler control circuit AC ₂ are activated. The cooler control circuit AC ₁ for the left side compares the temperature set by the control volume RTS with the temperature on the left side of the passenger compartment detected by the thermistor THI ₁ for detecting the inside air temperature for the left side of the vehicle, and detects the inside air temperature for the left side. If the temperature detected by the thermistor THI ₁ is higher, the relay RL ₁₉ is energized, the left magnet coil EC ₁ is energized, and the left refrigeration cycle 100 is operated. At this time, if the main switch SWB is energized to the A terminal, the temperature and control volume on the left side of the room
Depending on the difference in the set temperature of RTS, for example, the difference is -3
If it is ℃, all relays RL ₁ to RL ₅ are turned on, and the blower volume of the left-side refrigerant evaporator blowers 411, 412, 413, 414 is set to the maximum speed (Hi), and if the difference is small, the blower volume is automatically set. Switch to the A stage and gradually reduce the air flow rate. When the refrigerant pressure in the left refrigeration cycle 100 becomes higher or lower than a predetermined value, the left high pressure switch SPH ₁ or the left low pressure switch SPL ₁ is turned on, and the left pressure abnormal lamp LBp ₁ is turned on. Turn off the relay PL ₁₉ and stop the operation of the left refrigeration cycle 100. Left side refrigerant evaporator 4
When frost occurs on 1, the left side thermistor THO ₁ provided on the left side refrigerant evaporator 41 detects the frost and turns off the relay RL ₁₉ .
Then, the operation of the left refrigeration cycle 100 is stopped. The cooler control circuit AC ₂ for the right side compares the temperature set by the control volume RTS with the temperature in the right side of the passenger compartment detected by the right inside air temperature detection thermistor THI ₂ for temperature measurement of the right side of the vehicle, If the temperature detected by the temperature detection thermistor THI ₂ is higher, the relay RL ₂₀ is energized, the right magnet coil FC ₂ is energized, and the right refrigeration cycle 200 is operated. At this time, if the main switch SWB is energized to the A terminal, depending on the difference between the temperature on the right side of the room and the set temperature of the control volume, if the difference is 3 ° C or more, turn on all relays RL ₆ to RL _10. The air flow rate is set to the highest speed (Hi), and when the difference is small, the air flow rate is automatically switched to 4 levels, and the air flow rate is gradually reduced. When the refrigerant pressure in the right side refrigeration cycle 200 becomes higher or lower than a predetermined value, the right side high pressure switch SPH ₂ or the right side low pressure switch SPL ₂ is turned on and the right side pressure abnormal lamp LBp ₂ is turned on. OF PL ₂₀ relay
Then, the operation of the right side refrigeration cycle 200 is stopped. When frost occurs on the right-side refrigerant evaporator 42, the right-side inside air temperature detection thermistor THI ₂ provided on the right-side refrigerant evaporator 42 detects frost and turns off the relay RL ₂₀ to operate the right-side refrigeration cycle 200. Stop. When the indoor light switch SWL is turned on, the relays RL ₁₉ and RL ₂₀ are energized for, for example, 10 seconds according to the power generation cycle detected by the alternator terminal N, and the left side refrigeration cycle 100 and the right side refrigeration cycle 200 are operated. The oil contained in the refrigerant is stirred to perform maintenance such as in winter. The ventilation control circuit AV drives the ventilation motor MV by operating the ventilation switch SWV to open / close the outside air introduction damper.

A terminal, L ₁ terminal, H ₂ terminal of a main switch SWB provided to switch the blowing capacity of the left side refrigerant evaporator blower 411, 412, 413, 414 and the right side refrigerant evaporator blower 421, 422, 423, 424 At each setting position of, the air flow rate is switched. A terminal has the highest speed (Hi) to the lowest speed (L)
Up to o), perform automatic switching in 4 steps. The L terminal is forcibly fixed at the lowest speed, and the H terminal is fixed at the highest speed.
Of the left side refrigerant evaporator blowers 411, 412, 413, 414 and the right side refrigerant evaporator blowers 421, 422, 423, 424 of the blower motors MB _{1 to} MB ₈ of the relays RL _{1 to} RL _{10 for} controlling energization and the amount of air blown. Table 1 below shows the relationship between energization.

In Table 1, ∘ indicates energization, and the margin indicates non-energization.

The switching of the blowing capacities of the left-side refrigerant evaporator blowers 411, 412, 413, 414 and the right-side refrigerant evaporator blowers 421, 422, 423, 424 will be described with reference to FIG.

When the main switch SWB is set to the L terminal, as shown in (a ₁ ) and (a ₂ ), the blower motors MB ₁ and MB ₂ connected in parallel, the resistor RB ₁ and the blower motor MB connected in parallel are connected. ₃ , BB ₄ , resistor RB ₃ , blower motors MB ₇ and MB ₈ connected in parallel, and resistor RB ₄ are connected in series, and a left-side refrigerant evaporator blower 411, 412, 413, 414 and a right side The refrigerant evaporator blowers 421, 422, 423, 424 operate at the lowest speed.

When the main switch SWB is connected to the M ₁ terminal, the blower motors MB ₃ and MB ₄ connected in parallel are connected in series and connected in parallel as shown in (b ₁ ) and (b ₂ ). Blower motors MB ₅ , MB ₆ and blower motors MB ₇ , MB ₈ connected in parallel with each other are connected in series, and a left side refrigerant evaporator blower 411, 412, 413, 414 and a right side refrigerant evaporator blower 421, 422, 423, The 424 operates at the first medium speed.

When the main switch SWB is set to the M ₂ terminal, as shown in (c ₁ ) and (c ₂ ), the blower motors MB ₁ and MB ₂ connected in parallel and the resistor RB ₁ and the blower motor MB connected in parallel are connected. ₃ , MB ₄ and resistor RB ₂ are connected in parallel, and the blower motors MB ₅ and MB ₆ and resistor RB ₃ are connected in parallel.
Blower motors MB ₇ , MB ₈ and resistor RB ₄ connected in parallel
And are connected in parallel, the left side refrigerant evaporator blower 411, 4
12, 413, 414 and right side refrigerant evaporator blowers 421, 42
2, 423 and 424 operate at the second middle speed, which is much faster than the first middle speed.

When the main switch SWB is connected to the H terminal, as shown in (d ₁ ) and (d ₂ ), the blower motors MB ₁ and MB ₂ connected in parallel and the blower motors MB ₃ and MB ₄ connected in parallel are connected.
And are connected in parallel, and the blower motors MB ₅ and MB _{6 that} are connected in parallel and the blower motors MB ₇ and MB ₈ that are connected in parallel are connected in series.
2, 413, 414 and right side refrigerant evaporator blowers 421, 42
2, 423 and 424 operate at high speed.

Switching of the blowing capacity of the left side refrigerant condenser blowers 214, 215, 216 and the right side refrigerant condenser blowers 224, 225, 226 is performed by changing the refrigerant pressure on the refrigerant discharge side of the left side refrigerant condenser 21 and the right side refrigerant condenser 22. Pressure switch for detecting left side SPC ₁
And the right side pressure switch SPC ₂ and the relays RL _{11 to} RL _18, and when both the left side pressure switch SPC ₁ and the right side pressure switch SPC ₂ are turned off, as shown in (e ₁ ) of FIG. , The parallel-connected blower motors MC _{1 to} MC ₃ and the parallel-connected blower motors MC _{4 to} MC ₆ are connected in series to weaken the blowing capacity, and at least either the left pressure switch SPC ₁ or the right pressure switch SPC ₂ When one of them is turned on, the blower motors MC _{1 to} MC ₃ connected in parallel and the blower motors MC _{4 to} MC ₆ connected in parallel as shown in (e ₂ ) of FIG.
And are connected in parallel to increase the blowing capacity.

Next, the operation of the above embodiment will be described.

Set the main switch SWB to other than OFF terminal.

The left-side refrigerant evaporator blowers 411, 412, 413, 414 and the right-side refrigerant evaporator blowers 421, 422, 423, 424 have blowing capacities according to respective setting states of the main switch SWB.

Set the main switch SWB to other than the OFF terminal and turn on the cooler switch SWC.

The left-side refrigerant condenser blowers 214, 215, 216 and the right-side refrigerant condenser blowers 224, 225, 226 are operated by energizing the left-side magnet coil EC ₁ or the right-side magnet coil EC ₂ , and the left-side refrigerant is used. The blowing capacity is set according to the setting states of the left side pressure switch SPC ₁ and the right side pressure switch SPC ₂ provided on the refrigerant discharge side of the condenser 21 and the right side refrigerant condenser 22.

Control volume RT that sets the cooling capacity of the passenger compartment
When the higher the temperature measured by the left-side inside air temperature detecting thermistor THI ₁ for detecting the temperature of the passenger compartment left of the set temperature of the S, relays RL ₁₉ and the left magnet coil EC ₁ by the operation of the left-side cooler control circuit AC ₁ Is energized, the left electromagnetic clutch 111 is engaged, and the rotational torque of the engine is transmitted to the left refrigerant compressor 11. This allows the left side refrigerant compressor 11
Sucks, compresses, and discharges the refrigerant. Left side refrigerant compressor 11
The refrigerant discharged from the refrigerant flows into the left-side refrigerant condenser 21, where the refrigerant is condensed and liquefied by forcedly exchanging heat with the outside air by the left-side refrigerant condenser blowers 214, 215, and 216, and the left-side receiver 511 and The left-side dryer 521 serves as a liquid-phase condensed refrigerant. This condensed refrigerant is adiabatically expanded in the left side pressure reducing device 31 to become a low temperature refrigerant, which absorbs heat in the left side refrigerant evaporator 41 to evaporate, and is then sucked into the left side refrigerant compressor 11 again, and the left inside air temperature detecting thermistor THI. Refrigeration cycle for the left side 1 until the measured temperature of ₁ becomes the same as the control volume RTS 1
Repeat 00. On the other hand, the left side refrigerant evaporator blower 411, 4
The air sucked from the cooling outside air introduction port 731 or the cooling inside air introduction port 732 by the operation of 12, 413, 414 is cooled by the left side refrigerant evaporative air 41, and the left side cold air duct 81 also passes through the left side cold air outlet 741. And cools the left side of the vehicle compartment from each cold air outlet provided in the cold air duct 81. At this time, if the main switch SWB is located at the A terminal, the amount of air blown by the left-side refrigerant evaporator blowers 411, 412, 413, 414 is automatically adjusted according to the difference between the room temperature on the left side of the vehicle and the set temperature of the control volume RTS. Change to.

Control volume RT that sets the cooling capacity of the passenger compartment
When the higher the temperature measured by the right-side inside air temperature detection thermistor THI ₂ for detecting the vehicle interior right temperature than the set temperature of the S, relay RL ₂₀ and the right magnet coil EC ₂ by the operation of the right-side cooler control circuit AC ₂ Is energized, the right electromagnetic clutch 122 is engaged, and the rotational torque of the engine is transmitted to the right refrigerant compressor 12. This allows the right-side refrigerant compressor 12
Sucks, compresses, and discharges the refrigerant. Right side refrigerant compressor 12
The refrigerant discharged from the refrigerant flows into the right side refrigerant condenser 22, where the refrigerant is condensed and liquefied by exchanging heat with the outside air by the right side refrigerant condenser blowers 224, 225, 226, and the right side receiver 51.
2 and the dryer 522 for the right side are used as the condensed refrigerant in the liquid phase.
This condensed refrigerant is adiabatically expanded in the right side pressure reducing device 32 to become a low temperature refrigerant, which absorbs heat in the right side refrigerant evaporator 42 and evaporates, and is then sucked into the right side refrigerant compressor 12 again, and the right side inside temperature detecting thermistor THI. Repeat the above cycle until the measured temperature of ₂ is the same as the control volume RTS. On the other hand, the air sucked from the cooling outside air introduction port 731 or the cooling inside air introduction port 732 by the operation of the right side refrigerant evaporator blower 421, 422, 423, 424 is cooled by the right side refrigerant evaporator 42, and the right side cool air. The air flows into the right-side cold air duct 82 through the outlet 742, and cools the right side of the vehicle compartment from each cold air outlet provided in the cold air duct 82. At this time, if the main switch SWB is at the A terminal, the room temperature on the right side of the vehicle and the control volume RT
The amount of air blown by the right-side refrigerant evaporator blowers 421, 422, 423, 424 is automatically changed according to the difference in the set temperature of S.

In the above embodiment, the operation of the left side refrigeration cycle and the right side refrigeration cycle is controlled by controlling the electromagnetic clutches of the left side refrigerant compressor and the right side refrigerant compressor according to the temperature and set temperature on the left side of the passenger compartment and the temperature and set temperature on the right side of the passenger compartment. In addition, according to the size of the difference between the room temperature and the set temperature, an example in which the air flow rate is independently controlled is shown, but the present invention is not limited to this.
If two left and right inside air temperature detectors are provided, even if there is only one refrigeration cycle, for example, two evaporators are installed in parallel, and a blower is installed for each to correspond to the left and right ducts of the vehicle. If so, the temperature deviation inside the vehicle can be adjusted by controlling the air flow rate independently on the left and right. Even if only one evaporator is used, cooled air is put into one chamber, and two air blowers installed in the left and right directions are independently controlled to change the distribution ratio of the air volume, so that a pseudo-similar effect can be obtained. The effect can be obtained.

In the above embodiment, the refrigerant circulation direction of the left side refrigeration cycle and the right side refrigeration cycle is an example of a refrigeration cycle having only one direction, but a cooler cycle and heat are provided by providing an electromagnetic four-way valve or the like that reverses the refrigerant circulation direction. It may be provided so as to switch between cycles and controlled as described above.

In this embodiment, the arrangement of the evaporator unit and the condenser unit is shown with the evaporator unit on the front side and the condenser unit on the rear side, but in addition, the condenser unit is arranged on the front side and the evaporator unit on the rear side. Alternatively, the evaporator unit and the condenser unit may be arranged on the left and right with respect to the traveling direction of the vehicle. In addition, a cooler case for storing the evaporator unit and a cooler case for storing the condenser unit are provided separately, or a cooler case for storing the left side refrigerant evaporator and a cooler case for storing the right side refrigerant evaporator, the left side The cooler case for accommodating the refrigerant condenser and the cooler case for accommodating the right-side refrigerant condenser may be provided separately, or the cooler cases for accommodating the functional components may be combined and provided separately.

[Brief description of drawings]

FIG. 1 is a refrigerant circuit diagram of a package-type rooftop-mounted vehicle cooling device according to the present invention, and FIG. 2 is an arrangement of functional parts of a package-type rooftop-mounted vehicle cooling device showing an evaporator unit and a condenser unit. 3 and FIG. 3 are schematic perspective views showing the package-type rooftop-mounted vehicle cooling device shown in FIG. 2 mounted on a bus vehicle, and FIG. 4 is an external view of the package-type rooftop-mounted vehicle cooling device. Top view,
FIG. 5 is an electric circuit diagram for controlling the package-type rooftop-mounted vehicle air conditioner of the present invention, and FIG. 6 is a left side refrigerant condenser blower, a right side refrigerant condenser blower, a left side refrigerant evaporator blower, and a right side. 7 is a refrigerant circuit diagram of a conventional package type roof-mounted vehicle cooling device for a vehicle, and FIG. 8 is a functional component of a conventional package type roof-mounted vehicle cooling device. It is explanatory drawing which shows arrangement | positioning. In the figure, 7 ... Cooler case, 9 ... Electric control circuit, 11
...... Left side refrigerant compressor, 12 …… Right side refrigerant compressor, 21…
… Left side refrigerant condenser, 22 …… Right side refrigerant condenser, 31 ……
Left side decompressor, 32 …… Right side decompressor, 41 …… Left side refrigerant evaporator, 42 …… Right side refrigerant evaporator, 81 …… Left side cold air duct, 82 …… Right side cold air duct, 100 …… Refrigeration cycle for left side, 200 ... Refrigeration cycle for right side, 711, 712, 7
13 …… Cooling air inlet for condenser, 721, 722, 723, 724,
725, 726 ...... condenser cooling air outlet, 731 ...... cooling air introduction port, 732 ...... cooling inside air introduction port, 741 ...... left for cool air outlet, 742 ...... right for cool air outlet, U ₁ ...... evaporated Unit, U ₂ ...... Condenser unit, THI ₁ ...... Left inside air temperature detecting thermistor, THI ₂ ...... Right inside air temperature detecting thermistor

Claims (2)

[Claims] 1. A refrigerant compressor driven by an engine,
Refrigerant condenser, decompression device, refrigerant evaporator, left side refrigerant evaporator blower for supplying cool air to the left side of the vehicle compartment, and cool air to the right side of the vehicle compartment are stored in a cooler case installed on the roof of the vehicle. In a cooling device including a right-side refrigerant evaporator blower for supplying and a control device that controls the blower, the control device is a left-side temperature detection unit that detects a left-side temperature in the vehicle interior and a right-side inside the vehicle interior. A package characterized by including temperature detection means for the right side for detecting the temperature, and independently controlling the air flow rates of the blower for the left side refrigerant evaporator and the blower for the right side refrigerant evaporator according to the output signal of each temperature detection means. Type rooftop-mounted vehicle cooling system. 2. The refrigerant compressor comprises two refrigerant compressors for the left side and the refrigerant compressor for the right side, which are arranged in parallel, and the rotational output of the engine is transmitted via the electromagnetic clutch for the left side and the electromagnetic clutch for the right side. The controller controls the air flow rate of the left side refrigerant evaporator blower and the right side refrigerant evaporator blower, the engagement / disengagement of the left side electromagnetic clutch and the right side electromagnetic clutch to the left side temperature detecting means and the right side temperature detecting means. The package-type rooftop-mounted vehicle air conditioner according to claim 1, wherein the package-type vehicle air-conditioner is controlled independently by output signals.