JPH08258557A - Air conditioner for vehicle - Google Patents

Abstract

PURPOSE: To detect the temperature of a nap compartment accurately so as to improve the responsiveness of internal temperature control in a device for cooling blast air by a cold accumulating pack to air-condition the inside of the nap compartment during the parking of a vehicle. CONSTITUTION: In a nap compartment 3, an internal temperature sensor 14 for detecting the temperature of the nap compartment 3 is installed in a part away from a cooling unit 5 so as not to be influenced by the cold air of a cold accumulating pack provided in the cooling unit 5. The temperature of the nap compartment 3 is thereby detected accurately by the internal temperature sensor 14 without being influenced by the cold air of the cold accumulating pack in the cooling unit 5, and on the basis of the detected temperature of the internal temperature sensor 14, the operation of a blower in the cooling unit 5 is automatically intermitted to control the temperature of the nap compartment 3 automatically.

Description

Detailed Description of the Invention

[0001]

FIELD OF THE INVENTION The present invention relates to a vehicle (for example, a truck).
The present invention relates to a vehicle cooling device for cooling a nap room.

[0002]

2. Description of the Related Art Conventionally, as a cooling device for cooling a nap room of a vehicle, a device described in Japanese Patent Laid-Open No. 62-149509 has been known. A nap room partitioned by a partition member such as a curtain is formed, and a nap bed is arranged in the nap room.

A cooling unit is arranged on the wall surface at the rear of the nap room, and the cooling unit has an inlet port in the lower part and an outlet port in the upper part, and further has a cold storage type inside thereof. Equipped with a cooler and blower. The cool storage cooler is composed of a refrigerant evaporator provided in a vehicle air-conditioning refrigeration cycle, and a cool storage material that is stored in the evaporator, and cools the cool storage material by the refrigerant evaporator when the truck is running. When the truck is stopped and the driver takes a nap in the nap room when the truck is stopped, the blower of the cooling unit is activated to blow air to the ventilation passage of the cool storage material, and the cool storage material and the blown air are blown. The heat exchange is performed between the cooling air and the cooling air, and the cooling air is blown out into the nap chamber from the outlet of the cooling unit.

On the other hand, in order to control the room temperature in the nap room to the target temperature set by the person taking a nap, a temperature sensor for detecting the room temperature is provided in the room air intake side flow path in the cooling unit. The operation of the blower is interrupted according to the detected temperature.

[0005]

However, in the above-mentioned conventional device, since the temperature sensor for detecting the room temperature is provided in the cooling unit, the cool air of the regenerator material and the unit itself is not detected when the blower is stopped (OFF). As a result, the temperature sensor is cooled to a temperature below room temperature. Also,
Since it is difficult to sense the actual change of the room temperature under the influence of the cold air, there is a problem that the room temperature cannot be controlled accurately (with good response).

The present invention has been made in view of the above points,
An object of the present invention is to improve the accuracy of room temperature control in a vehicle cooling device having a cool storage cooler.

[0007]

The present invention employs the following technical means in order to achieve the above object. According to the invention of claim 1, in a vehicle having a nap room (3) for an occupant to take a nap, a cooling unit (5) installed in the nap room (3) and the cooling unit (5) A cooling unit (54) provided with the blower unit (9) provided therein, and a cool storage member (55) provided in the cooling unit (5) for cooling the blown air of the blower unit (9), and the cooling unit. The suction port (6) provided in (5) for sucking air in the nap chamber (3) and the cold air cooled in the cooling unit (54) provided in the cooling unit (5) are used for the nap. The air outlet (7) that blows into the chamber (3) and the nap chamber (3) are installed at a location apart from the cooling unit (5) so as not to be affected by cold air of the cooling unit (5). Temperature detection for detecting the room temperature of the nap room (3) A step (14) and a control means (42) for receiving the detection signal of the temperature detection means (14) and controlling the operation of the blower means (9) to control the room temperature of the nap room (3). It is characterized by a vehicle cooling device including the.

According to a second aspect of the invention, in the vehicle cooling system according to the first aspect, the temperature detecting means (14)
Is disposed so as to be located in the vicinity of the head of the nap person (A) lying in the nap room (3). According to a third aspect of the present invention, in the vehicle cooling device according to the first or second aspect, the cooling unit (5) is arranged on a side wall (10) of the nap chamber (3) at one end side in the vehicle width direction. The outlet (7) is configured to blow out cool air from the upper portion of the cooling unit (5) toward the side wall (11) of the nap chamber (3) on the other end side in the vehicle width direction. And the temperature detecting means (14)
However, the side wall (1) at the other end of the nap room (3) in the vehicle width direction is
It is characterized in that it is arranged at a site close to 1) and at a site close to the floor surface side of the nap room (3).

According to a fourth aspect of the present invention, in the vehicle cooling apparatus according to the first aspect, the cooling is performed so as not to be affected by the cold air of the cooling unit (5) in the nap chamber (3). A control panel (12) is installed at a part away from the unit (5).
In addition, a temperature setting means (16) for setting a target temperature of the nap room (3), an air blowing operation means (15) for intermittently operating the air blowing means (9), and the temperature detecting means (14) are provided. The control means (42) controls the operation of the blower means (9) in response to signals from the temperature detection means (14), the temperature setting means (16) and the blower operation means (15). It is characterized in that it is configured to.

The reference numerals in parentheses of the above-mentioned means indicate the correspondence with the concrete means described in the embodiments described later.

[0011]

According to the inventions of claims 1 to 4,
In the nap room, temperature detection means for detecting the room temperature of the nap room is installed at a location away from the cooling unit so as not to be affected by the cool air of the cooling unit. Since the room temperature of the nap room can be accurately detected without receiving the temperature, the temperature detected by the temperature detection means is approximately the same as the room temperature of the nap room, and the nap room 3
The room temperature can be automatically controlled with high response and high accuracy.

In addition to this, in the invention according to claim 2, in particular, since the temperature detecting means is arranged so as to be located in the vicinity of the head of the nap person lying in the nap room, the vicinity of the head of the nap person is located. It can accurately detect the room temperature of
You can achieve more comfortable feeling during nap cooling.
Further, in the invention according to claim 4, a control panel is installed in a portion apart from the cooling unit so as not to be affected by the cool air of the cooling unit, and the target temperature of the nap chamber is set in the control panel. Temperature setting means, blower operating means for interrupting the operation of the blower means, and the temperature detecting means, and the operation of the blower means in response to signals from the temperature detecting means, the temperature setting means and the blower operating means. Therefore, the nap person can easily perform operations such as operation control of the air blowing unit and switching of the temperature setting in a posture of sleeping while in the nap room.

[0013]

Embodiments of the present invention will be described below with reference to the drawings. (First Embodiment) FIGS. 1 to 5 show an example in which the present invention is applied to a cold storage type cooling device for a nap room for a truck. In FIGS. 1 and 2, a bed 4 is provided behind a cab 1 of a truck. A nap room 3 is provided. In the nap room 3, a cooling unit 5 is arranged on a side wall 10 on one end side in the vehicle width direction.

This cooling unit 5 has a vertically long and thin case 51 formed in a rectangular parallelepiped shape, and a suction port 6 for sucking the air in the nap chamber 3 is provided at a lower portion of the case 51.
Is provided. This suction port 6 is, as shown in FIG.
The cooling unit 5 is composed of a large number of small holes, and the holes are formed over substantially the entire area of the cooling unit 5 in the front width direction.

A lattice-shaped outlet 7 is provided in the upper portion of the case 51 to blow cold air toward the side wall 11 (see FIG. 4) on the other end side in the vehicle width direction. This outlet 7
Is approximately ⅓ in the width direction of the front surface of the cooling unit 5 in order to ensure a blowing air velocity at which cold air can reach the head of the napper A.
It is formed only in a narrow range to narrow the opening area.

As shown in FIG. 3, an air flow path 52 communicating with the air outlet 7 is formed in an upper part inside the case 51. Being located in this air flow path 52,
A centrifugal blower 9 driven by a motor (not shown) is arranged. A chamber 53 for installing a cooler is defined in a lower portion of the air flow path 52, and a refrigerant evaporator 54 and a cool storage pack 55 are installed in the chamber 53.

In this example, the evaporator 54 is constructed by using a multi-hole flat tube made of aluminum. This multi-hole flat tube has a width L (see FIG. 3) of the cold storage pack 55.
As is well known, a large number of holes for refrigerant passages are formed in parallel, which are formed in a flat cross section having a width dimension equivalent to that in (b). The flat tube has bent portions at the upper and lower ends of FIG. 3, and is formed so as to meander in the vertical (up and down) direction.

A regenerator material pack 55 is disposed so as to be in close contact with the left and right side surfaces of the flat tube of the refrigerant evaporator 54. As shown in FIG. 3 (a), the cold storage material pack 55 is formed in a vertically long uneven shape in the vertical direction,
A thin pack-shaped (bag-shaped) member formed of resin is filled with water or a soft gel-like cold storage material.

Further, as the material of the pack 22, a material which is easily thinned, such as nylon or polyethylene, is preferable in order to improve the heat exchange property with the blown air. In FIG. 3A, reference numeral 56 is an air passage formed between the uneven cool storage pack 55 and the flat tube of the refrigerant evaporator 54.
The arrow a in FIG. 3B indicates the flow of air passing through the ventilation passage 56.

Reference numeral 57 denotes an upper portion of the chamber 53, which is a communication port provided at a rear wall surface side of the case 51, and connects the upper portion of the chamber 53 to the suction side of the blower 9. The evaporator 54 constituting the cooler and the cold storage pack 55 are installed in substantially the entire width direction of the case 51 (left-right direction in FIG. 3A), but the suction port 6 is also provided in the case 51 as described above. Since it is installed in almost the entire area in the width direction, the intake air uniformly flows into the ventilation passage 56 and exchanges heat with the regenerator material pack 55 in almost the entire area in the width direction of the case 51, so that the heat exchange area is increased. Can be achieved.

A control panel 12 for cooling the nap room is shown in FIG.
As shown in FIG. 2, the rear wall 13 of the nap chamber 3 is arranged at a position near the head of the napper A sleeping on the bed 4 (hence, a position sufficiently distant from the cooling unit 5).
This control panel 12 is formed in a box shape from resin or metal as shown in an enlarged view in FIG. 5, and a room temperature sensor 14 for detecting the room temperature of the nap room 3 is provided on one side surface of the box shape. Has been done. The room temperature sensor 14 senses the room temperature near the head of the napper A by using a temperature sensitive element such as a thermistor.

The specific construction of the room temperature sensor 14 is as follows.
As shown in FIG. 6, in order to protect the temperature sensitive element 14a,
The temperature sensitive element 14a is housed in a sensor case 14b which is formed of resin or metal into a box shape. Then, in order to satisfactorily ventilate room air into the temperature-sensitive element 14a portion, a sufficiently large opening 14c is provided on a plurality of surfaces of the sensor case 14b, and a mesh member 14 such as a wire mesh is provided in this opening 14c.
d is attached.

Here, instead of the mesh member 14d, a fine slit-shaped opening is provided in the sensor case 14b,
Ventilation to the temperature sensitive element 14a may be ensured.
Further, the sensor case 14b is integrally formed with a screw mounting portion 14e, and the screw 14f is passed through the screw mounting portion 14e so that the sensor case 14b can be detachably mounted on the side surface of the control panel 12.

Reference numeral 15 denotes a blower operation switch (nap sleep cooling switch) disposed on the front upper portion of the control panel 12 for setting the air blow mode for cooling the nap room 3 on and off. Specifically, the cooling unit 5 is operated by the air blow operation switch 15.
The OFF button 15a and the LO (low speed) button 1 so as to perform intermittent operation of the blower 9 in the inside and speed switching (HI / LO)
5b and HI (high speed) button 15c are provided.

Reference numeral 16 denotes a temperature setting device for setting a target cooling temperature of the nap room 3, which is provided on the lower front portion of the control panel 12. In this example, the temperature setting device 16 includes a lever fitting groove 16a extending in the horizontal direction, an operation lever 16b slidably disposed in the fitting groove 16a and manually operated, and an operation lever 16b. It is composed of a variable resistor (not shown) which is operated and whose resistance value changes.

The installation location of the room temperature sensor 14 will be described more specifically with reference to FIG. 4. In the room temperature sensor 14, the distance W2 from the side wall 11 on the other end side in the vehicle width direction is 400 to 600.
In mm, the height H8 from the bed 4 is 150 mm. In FIG. 4, reference numeral 17 denotes a mounting base for the cooling unit 5, which is formed in a gate shape from a metal plate such as an iron plate or resin and is arranged adjacent to the lower portion of the side wall 10 on one widthwise end side of the vehicle body. It is set up. The mount 17 is fixed to the vehicle body by an appropriate fixing means, and the cooling unit 5 is placed and fixed on the upper surface of the mount 17.

The mount 17 has a gate-like shape and forms a space 17a into which the end of the bed 4 and the tip of the foot of the napper A can be inserted. 18 is a window glass part, 1
9 is a passenger seat. In FIG. 4, as an example of specific dimensions when the cooling unit 5 is installed, W1 = 2000 to
2200mm, H1 = 1000mm, H2 = 300m
m, H3 = 560 mm, H4 = 400 mm, H5 = 40
mm, H6 = 700 mm, H7 = 60 mm.

FIG. 7 is a refrigeration cycle diagram including an electric control circuit of the device of the present invention.
Similar to the device described in Japanese Patent Publication No. 2-149509, it is installed in the air conditioning refrigeration cycle of the cab 1 of the truck. More specifically, 21 is a compressor, which is driven by an engine (not shown) for running a truck via an electromagnetic clutch 21a. Reference numeral 22 is a condenser for cooling and condensing the high-temperature, high-pressure gas refrigerant discharged from the compressor 21, and 23 is a liquid receiver for accumulating the liquid refrigerant condensed in the condenser 2 and discharging only the liquid refrigerant.

Reference numeral 24 is an electromagnetic valve for connecting and disconnecting the refrigerant flow, 25 is a temperature actuated expansion valve as a pressure reducing means for decompressing and expanding the liquid refrigerant, and 25a is its temperature sensitive cylinder. Reference numeral 26 denotes a refrigerant evaporator for air conditioning of a truck driver's cab, which is installed in an air conditioning unit 27 provided below the dashboard 1a (see FIG. 1) in front of the truck's driver's cab 1. This air conditioning unit 27
Air is blown into the inside by a blower 28, and the blown air is cooled by an evaporator 26 and then blown out into a driver's cab (vehicle compartment) 1 via a heater unit and a blowout port mechanism (not shown).

Numeral 29 is a device (25, 2) for air conditioning of the cab.
6), the solenoid valve 24 interrupts the refrigerant flow to the air conditioning refrigerant circuit 29. Reference numeral 30 denotes a cold storage refrigerant circuit provided in parallel with the air conditioning refrigerant circuit 29, 31 denotes a constant pressure expansion valve as a pressure reducing means for decompressing and expanding the liquid refrigerant flowing into the cold storage refrigerant circuit 30, and its downstream side has a predetermined size. When the pressure drops below the pressure, the valve opens.

On the downstream side of the constant pressure expansion valve 31, the cold-storage refrigerant evaporator (cooling means, cooling heat exchanger) 54 is connected. A check valve 32 prevents the high temperature refrigerant from flowing back from the air conditioning evaporator 26 side to the cold storage evaporator 54, so that the refrigerant flows in only one direction from the upstream side to the downstream side of the cold storage evaporator 54. It is something to flush. The cool storage evaporator 54 has a latent heat of vaporization of the refrigerant circulating therein (refrigerant vaporization temperature: for example, -20 °).
According to C), the cold storage pack 55 is cooled to store cold in the cold storage material. B of FIG. 7 shows a nap room cooling device.

Next, the electric control section will be described.
Is a cool storage switch for setting a cool storage mode in which a refrigerant is caused to flow through the cool storage evaporator 54 to cool the cool storage material pack 55. The cold storage switch 41 is a control panel (not shown) for an automobile air conditioner provided in the cab 1.
Is installed in. Reference numeral 42 denotes an electric control device, which is a room temperature sensor 14 installed on the control panel 12 and a blow operation switch 1
5 and the signal input from the temperature setting device 16, the signal input from the cold storage switch 21, and the signal input from the pack temperature sensor 43 that detects the temperature of the cold storage material pack 55, the blower 9 and The operation of the solenoid valve 24 is controlled. The electric control device 42 can be configured by using a known analog circuit or a digitally controlled microcomputer.

The pack temperature sensor 43 is composed of a temperature sensitive element such as a thermistor, and is composed of 43a and 43 in FIG.
As shown in b and 43c, it is arranged on the surface of the pack 55 located on the most downstream side of the refrigerant among the cool storage material packs 55 arranged between the flat tubes of the cool storage evaporator 54.
The setting of the arrangement position of the pack temperature sensor 43 is as follows.
This is to accurately detect the completion of cold storage of the plurality of cold storage material packs 55, and for that purpose, dispose the pack temperature sensor 43 on the most downstream side of the refrigerant (positions indicated by 43a, 43b, 43c), and It is important to dispose not on the flat tube side surface of the cold storage evaporator 54 of the material pack 55 but on the surface opposite to the flat tube so as not to detect the flat tube temperature.

In FIG. 8, 54a is a refrigerant inlet of the cold storage evaporator 54, and 54b is a refrigerant outlet. next,
The operation of the present embodiment having the above configuration will be described. When an air conditioning switch (not shown) of an automobile air conditioner is turned on and the compressor 21 of the air conditioning refrigeration cycle in the cab 1 of the truck is driven by the vehicle engine, refrigerant circulates in the refrigeration cycle. In this state, when the cold storage switch 41 is turned on, the electric control device 42 automatically controls the solenoid valve 25 to be turned on and off in response to the switch closing signal. As a result, the refrigerant intermittently circulates in the cold storage evaporator 54 in the cooling unit 5 and cools the cold storage pack 55 by the latent heat of vaporization of the refrigerant, so that the cold storage material (such as water) in the cold storage pack 55 is frozen. As a result, the cold storage effect can be achieved.

The operation of the cold storage mode will be described with reference to the flowchart of FIG. 9. The control routine of FIG. 9 is started by turning on the air conditioning switch (not shown), and in step S1, sensor signals, switch signals, etc. are read, In the next step S2, it is determined whether the cold storage switch 41 is ON or OFF, and when the cold storage switch 41 is ON, the process proceeds to the next step S3, where it is determined whether or not the cold storage of the cold storage material pack 55 is completed. The determination is made based on the detection signal of the temperature sensor 43.

That is, when the "surface temperature of the cold storage material pack 55 on the most downstream side of the refrigerant" detected by the pack temperature sensor 43 decreases to a set temperature (for example, -5 ° C), it is determined that cool storage is completed, and the detected temperature is When the set temperature of -5 ° C is higher than 0 ° C for which the hysteresis is set, it is determined that the cold storage is not completed. Since the detected temperature is higher than the set temperature at the initial stage of turning on the cold storage switch 41, the determination in step S3 is incomplete cold storage (NO), the process proceeds to step S4, and the refrigerant circuit intermittent operation is performed. That is, the solenoid valve 24 is energized intermittently by the timer circuit, and the solenoid valve 24 is energized and opened for a predetermined time interval, for example, 60 seconds, and the solenoid valve 24 is energized and shut off for 15 seconds. The state of being valved is alternately repeated.

As a result, the refrigerant intermittently flows into the cold storage refrigerant circuit 30, but the constant pressure expansion valve 31 provided in the cold storage refrigerant circuit 30 has a downstream pressure of a predetermined pressure, for example, 0.5 kgf /. When the temperature drops to cm ² (evaporation temperature: -20 ° C for refrigerant R134a), the valve opens. When the solenoid valve 24 is closed and the refrigerant flow to the air conditioning refrigerant circuit 29 is shut off, the refrigerant suction action of the compressor 21 causes the pressure of the cold storage refrigerant circuit 30 to drop sharply.
1 opens, the refrigerant flows into the cold storage evaporator 54, and the cold storage pack 55 is cooled by the latent heat of vaporization of the refrigerant.

The refrigerant intermittently flows into the cold storage evaporator 54, whereby the cold storage material (water or the like) in the cold storage pack 55 is gradually cooled to freeze the cold storage material. When the temperature detected by the pack temperature sensor 43 falls below -5 ° C, the determination in step S3 is that cool storage is complete (YES).
Then, the process proceeds to step S5, so that the intermittent operation of the refrigerant circuit in step S4 is stopped and the solenoid valve 24 remains open. As a result, the pressure on the downstream side of the constant pressure expansion valve 31 becomes equal to or higher than the predetermined pressure, so that the constant pressure expansion valve 31 remains closed.

As the time passes, the pack temperature sensor 43
When the detected temperature of is higher than 0 ° C, which is the hysteresis set with respect to -5 ° C, the determination in step S3 becomes NO again, and the refrigerant circuit intermittent operation in step S4 is performed again. The cold storage switch 41 is OFF
In this case, the determination in step S2 is NO, so the cold storage mode is not set, and the normal operation of air conditioning (the solenoid valve 24 remains open) is performed in step S5.

On the other hand, when the driver or the like takes a nap in the nap room 3 when the truck is parked, when the driver or the like performs cooling, the blower operation switch 15 provided on the nap room cooling control panel 12 is turned on. Then, since the electric control device 42 operates the blower 9, the blown air flows in the case 51 of the cooling unit 5 along the path indicated by the arrow in FIG. 3, and the blown air is the cold storage pack 55.
When passing through the ventilation passage 56 between the evaporator 54 and the evaporator 54, it exchanges heat with the cold storage pack 55 and is cooled to become cold air. This cold air passes through the communication port 57 and the air flow path 52, and then the air outlet 7
To the inside of the nap room 3 to cool the nap room 3.

Until the cold storage material in the cold storage pack 55 is completely melted and the temperature rises, the nap room can be cooled during parking. Therefore, the cooling action can be exhibited without operating the refrigeration cycle. Further, since the cooling unit 5 is installed in the side wall 10 on one end side in the vehicle width direction in the nap chamber 3, and the air outlet 7 opening toward the side wall on the other end side in the vehicle width direction is provided above the side wall 10. The cold air from the air outlet 7 can be blown toward the side wall 11 on the other end side in the vehicle width direction as indicated by the arrow B in FIGS. 1 and 4 to allow the cool air to reach the vicinity of the head of the napper A. The upper half of the sleeper A can be effectively cooled.

Since the suction port 6 is provided in the lower portion of the cooling unit 5, an air flow (see arrow C in FIGS. 1 and 4) is generated from the upper half of the nap person A through the lower half of the body to the suction port 6. be able to. Therefore, the upper body of the napper A can be effectively cooled, and the flow of cool air can be uniformly applied to the whole body from the upper body to the lower body, so that the napper A can be provided with a comfortable cooling feeling.

Next, the operation in the cooling mode in which the blower 9 is operated to cool the nap room 3 as described above will be described more specifically. The control routine of FIG. 10 is performed by an engine key switch (not shown). It starts by turning on, and step S1
At 0, the closed state of the blower operation switch 15 is determined, and the LO (low speed) button 15b or HI of this switch 15 is determined.
When the (high speed) button 15c is pressed, the sensor signal or the like is read in the next step S11.

Then, in the next step S12, it is judged whether the room temperature detected by the room temperature sensor 14 is higher or lower than the judgment value based on the set temperature. This determination is specifically shown in FIG.
As shown in, the judgment value having a hysteresis of ± 0.5 ° C. with respect to the set temperature TSET set by the temperature setter 16 is compared with the room temperature detected by the room temperature sensor 14.

When the room temperature is lower than the judgment value based on the set temperature shown in FIG. 11, the judgment in step S12 is NO, the process moves to step 13 and the blower 9 is stopped. On the contrary, when the room temperature is higher than the determination value based on the set temperature in FIG. 11, the process proceeds to step 14 and the blower 9 is operated at a low speed in response to the blow-on operation switch 15 closing state determined in step S10. Operate at high speed.

As described above, the LO of the air blow operation switch 15 is
(Low speed) button 15b or HI (High speed) button 15c
When is turned on, the operation of the blower 9 is interrupted to automatically maintain the room temperature in the nap room 3 at the set temperature. here,
In this embodiment, the room temperature sensor 14 is installed not in the case 51 of the cooling unit 5 but in the rear wall 13 of the nap room 3.
At a position in the vicinity of the head of the napper A sleeping on the bed 4 (therefore, a position sufficiently separated from the cooling unit 5)
Since it is installed in the nap room, the room temperature of the nap room 3 should be set for the following reasons.
It responds accurately to room temperature changes and can be automatically controlled appropriately.

FIG. 12 shows a comparative example for clarifying the effect of this embodiment. The mounting position when the room temperature sensor 14 is installed inside the case 51 in the cooling unit 5 is indicated by 14A, and the case 51 is shown. The mounting position when installed on the surface of is indicated by 14B. In this way, when the room temperature sensor 14 is installed inside (14A) or on the surface (14B) of the cooling unit case 51, the room temperature sensor 14 is affected by the cool air of the cold storage pack 55 when the blower 9 is stopped,
The low temperature due to this cold air is detected.

That is, as shown by a broken line C in FIG. 13, the room temperature near the head of the nap person A moves up and down by turning the blower 9 ON and OFF, whereas the detected temperature D of the 14A and 14B sections is changed. Is affected by the cold air of the cold storage pack 55 and exhibits a change having an inverse correlation with the room temperature C near the head of the napper A, resulting in a problem that the room temperature cannot be controlled well.

On the contrary, the room temperature sensor 1 according to the present embodiment
4 can accurately detect the room temperature C in the vicinity of the head of the napper A without being affected by the cold air of the cold storage pack 55. Therefore, the detected temperature of the room temperature sensor 14 is as shown in E of FIG. The temperature approximately matches the room temperature C near the head, and the automatic control of the room temperature of the nap room 3 can be appropriately performed. Further, in this embodiment, the control panel 12 is provided near the head of the sleeper A.
In addition to the room temperature sensor 14, the control panel 12 is provided with the blower operation switch 15 and the temperature setter 16. Therefore, the napper A is lying on the bed 4 and the blower 9 is installed. It is possible to easily carry out operations such as operation control and temperature setting switching. (Second Embodiment) FIGS. 14 to 15 show a second embodiment in which the opening pressure of the constant pressure expansion valve 31 can be changed according to the cooling condition of the cold storage pack 55. The axis is the elapsed time after the start of cold storage, and the vertical axis is the evaporation temperature of the cold storage evaporator 54.

As shown by the broken line F in FIG. 14, the valve opening pressure of the constant pressure expansion valve 31 is 0.5 kgf / cm from the beginning of the cold storage.
² If the temperature is constant, the refrigerant evaporation temperature is -20 from the beginning.
Although the temperature was as low as ° C, the constant pressure expansion valve 31 reduced the temperature to 0.
Since the refrigerant is depressurized to a low pressure of 5 kgf / cm ^2, the specific volume of the refrigerant passing through the cold storage evaporator 54 is approximately 1.16 cm ³ / kg, and the refrigerant flow rate (weight flow rate) is reduced. However, there is a problem in that the cooling capacity of is reduced and the time until the completion of cold storage is prolonged.

Therefore, in the second embodiment, the above-mentioned problem is solved by changing the valve opening pressure of the constant pressure expansion valve 31 in accordance with the cooling condition of the cold storage pack 55. That is, as shown in FIG. 14, at the beginning of the cold storage, the temperature of the cold storage material of the cold storage pack 55 is sufficiently high and the cold storage material (water) undergoes sensible heat change. Therefore, as a low heat source for cooling the cold storage pack 55, A temperature of about -10 ° C is sufficient.

In the second embodiment, paying attention to the above points, at the beginning of the cold storage, the first set value for raising the valve opening pressure of the constant pressure expansion valve 31, for example, 1.2 kgf / cm ² (refrigerant evaporation temperature) : -10 ° C). As a result, the specific volume of the refrigerant passing through the cool storage evaporator 54 is approximately 1.15 cm ^3.
/ Kg, and the refrigerant flow rate (weight flow rate) increases, the cooling capacity of the cold storage pack 55 increases, and the cold storage pack 5 increases.
The cooling time of 5 can be shortened.

When the temperature of the regenerator material drops to a temperature near the freezing point (0 ° C), the regenerator material changes latent heat thereafter. Here, a second set value for lowering the valve opening pressure of the constant pressure expansion valve 31, for example, 0.5 kgf / cm ² (refrigerant evaporation temperature: −
20 ° C). Thereby, the cool storage evaporator 54
Since a sufficient temperature difference between the cold storage material and the cold storage material can be secured, it is possible to favorably promote freezing of the cold storage material due to latent heat change.

The Mollier diagram of FIG. 15 shows the operation of the refrigeration cycle according to the second embodiment. In the figure, 90 is the refrigerant evaporation pressure of the air conditioning evaporator 26, and 91 is the constant pressure expansion valve 31 at the beginning of cold storage. First valve opening pressure of the cold storage evaporator 54
Is the second valve opening pressure of the constant pressure expansion valve 31 (refrigerant evaporation pressure of the cold storage evaporator 54) after the cooling degree of the regenerator material has advanced by a predetermined amount.

Next, a specific configuration for changing the valve opening pressure of the constant pressure expansion valve 31 will be described with reference to FIG.
Reference numeral 0 is a refrigerant inlet of the constant pressure expansion valve 31, and 311 is a refrigerant outlet. Reference numeral 312 denotes a throttle passage provided between the refrigerant inlet 310 and the refrigerant outlet 311, and 313 denotes the throttle passage 31.
A valve body 314 for adjusting the opening degree of 2 is a coil spring 315 for applying a spring force in the valve closing direction to the valve body 313.
Is a cylindrical adjusting screw for adjusting the spring force of the spring 314, and is fixed to the valve body 316 by screwing.

Reference numeral 317 denotes a diaphragm case, which is the valve body 3
The outer peripheral portion of the diaphragm 318 is hermetically fixed between the outer peripheral portion and the outer peripheral portion of the diaphragm 16. In the sealed space 319 formed between the diaphragm case 317 and the diaphragm 318, one end of a thin tube 320 formed of a metal having excellent thermal conductivity such as copper is opened, and the other end of the thin tube 320 is formed. Is sealed.

A pressure medium (the same refrigerant as the circulating refrigerant in the refrigeration cycle) is enclosed in the sealed space 319 and the thin tube 320, and the thin tube 32 is surrounded by the thin tube 320.
A heating device 321 for heating 0 is installed.
The heating device 321 is, for example, an electric heater and is controlled by the electric control device 42. The diaphragm 318 is made of a metal such as stainless steel, and the contact member 322 is arranged below the diaphragm 318, and the valve operating rod 323 is provided.
The displacement of the diaphragm 318 is transmitted to the valve body 313 via the. Further, in the space below the diaphragm 318 (the space around the contact member 322), the valve body 313 is
The low-pressure side pressure on the downstream side (evaporation pressure of the cold storage evaporator 54) is introduced through a refrigerant passage (not shown).

Therefore, the valve body 313 is the diaphragm 31.
8 When the pressure in the space below the diaphragm 318 decreases to a predetermined value determined by the pressure in the upper sealed space 319 and the spring force of the spring 314, the valve opens. At the beginning of the cold storage, the electric controller 42 energizes the heating device 321 to heat the pressure medium inside the sealed space 319 and the narrow tube 320, so that the temperature of the pressure medium rises and the medium pressure rises. Due to this increase in medium pressure, the valve body 3
Since 13 receives the force in the valve opening direction, the valve opening pressure of the constant pressure expansion valve 31 can be increased to the first valve opening pressure 91 of FIGS.

After the cooling degree of the regenerator material has progressed by a predetermined amount, when the electric control device 42 stops energizing the heating device 321, the medium pressure inside the sealed space 319 and the narrow tube 320 is reduced to a constant pressure. The valve opening pressure of the expansion valve 31 is shown in FIG.
A second valve opening pressure 92 of 4, 15 can be lowered. In the second embodiment, the electric control device 42
A typical control example of the energization control of the heating device 321 by means of determining whether or not the elapsed time after the start of cold storage has passed a predetermined time or more is, but the detected temperature of the pack temperature sensor 43 is used. Alternatively, it may be determined whether or not the detected temperature has decreased to a predetermined temperature, and the energization control of the heating device 321 may be performed.

Further, the energization control to the heating device 321 is not changed stepwise, but is continuously changed so that the valve opening pressure of the constant pressure expansion valve 31 is continuously changed corresponding to the progress of the cooling degree of the regenerator material. You may make it lower. Also, the heating device 3
When the heating is not performed by the valve 21, the internal pressure of the sealed space 319 and the thin tube 320 is set to a negative pressure of 0 kgf / cm ² or less, so that the valve closing force by the valve body 313 increases. It is possible to improve the effect of preventing refrigerant leakage at the time.

Further, as a means for changing the valve opening pressure of the constant pressure expansion valve 31, the heating device 321 is abolished and an electromagnetic mechanism is provided in its place, and the position of the valve body 313 is forcibly corrected by this electromagnetic mechanism. Alternatively, it is also possible to adopt a configuration such as adjusting the spring force of the spring 314. Further, the valve opening pressure of the constant pressure expansion valve 31 is set to the OFF signal of the air conditioning switch or the cold storage switch 41 or the pack temperature sensor 4
The cold storage completion signal based on the detected temperature of 3 may be set to the minimum pressure to increase the valve closing force of the valve body 313. (Third Embodiment) In the above-described first embodiment, the room temperature sensor 14 is integrated with the control panel 12 as shown in FIG. 5, but the room temperature sensor 1 having the structure as shown in FIG.
4 is separated from the control panel 12, and the room temperature sensor 14 is separately installed in the nap room 3 at a position apart from the cooling unit 5 so as not to be affected by the cool air of the cooling unit 5, and the control panel 12 is installed. As shown in FIG. 17, it may be installed on the front surface of the case 51 of the cooling unit 5.

In the third embodiment, specifically, the control panel 12 is installed on the front side of the case 51 of the cooling unit 5 at a position lateral to the air outlet 7. Note that the present invention can be implemented in various modes other than the illustrated embodiments described above. For example, in addition to a truck, in a vehicle such as a one-box car, the engine is stopped by cooling the space at the rear of the passenger compartment when the vehicle is parked. The device of the present invention may be used for such purposes.

In addition to the type in which the flat tubes are bent in a meandering shape as the evaporator 54, a large number of straight flat tubes are arranged in parallel, and refrigerant inlets are provided at both ends of the parallel flat tubes. A type having an outlet tank (generally called a multi-flow type) may be used. Further, the room temperature sensor 14 and the control panel 12 may be separately configured, and may be installed in the nap room 3 at a location apart from the cooling unit 5 so as not to be affected by the cool air of the cooling unit 5. .

[Brief description of drawings]

FIG. 1 is a schematic explanatory view showing an installation form of a cooling unit according to a first embodiment of the present invention.

FIG. 2 is a schematic explanatory view showing an installation form of a cooling unit according to the first embodiment of the present invention.

3A is a partially cutaway front view of the cooling unit 5 of FIG. 1, and FIG. 3B is a sectional view thereof.

4A is a side view showing a concrete installation structure of the cooling unit 5, and FIG. 4B is a front view thereof.

FIG. 5 is a perspective view of a control panel in the first embodiment.

FIG. 6 is a perspective view of a room temperature sensor portion in the first embodiment.

FIG. 7 is a refrigeration cycle diagram including an electric circuit unit in the first embodiment.

FIG. 8 is a front view of a cool storage evaporator portion in the first embodiment.

FIG. 9 is a flowchart of cold storage control in the first embodiment.

FIG. 10 is a flow chart of room temperature control in the first embodiment.

FIG. 11 is a characteristic diagram illustrating a determination value for room temperature control in the first embodiment.

FIG. 12 is a perspective view of a cooling unit for explaining a comparative example of the first embodiment.

FIG. 13 is a characteristic diagram illustrating the effect of room temperature control in the first embodiment.

FIG. 14 is a characteristic diagram showing the concept of setting the valve opening pressure of the constant pressure expansion valve in the second embodiment.

FIG. 15 is a Mollier diagram of the refrigeration cycle in the second embodiment.

FIG. 16 is a half cross-sectional view showing a specific structural example of the constant pressure expansion valve in the second embodiment.

FIG. 17 is a partially cutaway front view of a cooling unit 5 showing a third embodiment.

[Explanation of symbols]

3 ... Nap room, 4 ... Bed, 5 ... Cooling unit, 6
...... Suction port, 7 ... Blowout port, 9 ... Blower, 10, 11
... Side wall, 12 ... Control panel, 14 ... Room temperature sensor, 15
... Blower operation switch, 16 ... Temperature setting device, 42 ... Electric control device, 54 ... Cold storage evaporator, 55 ... Cold storage pack,
A ... A nap person.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Sugimitsu, 1-1, Showa-machi, Kariya city, Aichi prefecture, Nihon Denso Co., Ltd. (72) Inventor, Yuichi Shirota, 1-1, Showa-cho, Kariya city, Aichi prefecture, Nidec Incorporated (72) Inventor Kazushi Yamamoto 1-1-1, Showa-cho, Kariya city, Aichi Nihon Denso Co., Ltd.

Claims (4)

[Claims] 1. In a vehicle having a nap room for an occupant to take a nap, a cooling unit installed in the nap room, a blowing unit provided in the cooling unit, and a cooling unit provided in the cooling unit, Cooling means having a regenerator for cooling the blown air of the blower means, an inlet provided in the cooling unit for sucking air in the nap chamber, and cold air provided in the cooling unit and cooled by the cooling means An outlet that blows out into the nap chamber, and in the nap chamber, a temperature detection unit that is installed at a site apart from the cooling unit so as not to be affected by cold air of the cooling unit, and that detects the room temperature of the nap chamber. And a control means for receiving the detection signal of the temperature detection means and controlling the operation of the blower means to control the room temperature of the nap room. And a vehicle cooling device. 2. The vehicle cooling device according to claim 1, wherein the temperature detecting means is arranged so as to be located in the vicinity of the head of a nap person lying in the nap room. 3. The cooling unit is disposed on a side wall of the nap room at one end side in the vehicle width direction, and the air outlet is located from an upper portion of the cooling unit to the other end side in the vehicle width direction of the nap room. Is configured to blow out cool air toward the side wall of the nap room, and the temperature detecting means is close to the side wall on the other end side in the vehicle width direction of the nap room and close to the floor surface side of the nap room. The cooling device for a vehicle according to claim 1 or 2, wherein the cooling device for a vehicle is disposed in a portion. 4. A control panel is installed in the nap room at a location away from the cooling unit so as not to be affected by cold air of the cooling unit, and a target temperature of the nap room is set on the control panel. The temperature setting means, the air blowing operation means for interrupting the operation of the air blowing means, and the temperature detecting means, and the control means is a signal from the temperature detecting means, the temperature setting means and the air blowing operating means. The cooling device for a vehicle according to claim 1, wherein the cooling device is configured to control the operation of the blower according to the above.