JPH06127260A - Refrigerating equipment for refrigerator car - Google Patents

Abstract

PURPOSE:To prevent the temperature rise in a refrigerator when a refrigerator car is stopped or the door of a refrigerator is open with a simple and inexpensive constitution without upsizing a compressor for the refrigerator. CONSTITUTION:A refrigeratining equipment for a refrigerator car is provided with a compressor 11 to cool a refrigerator of the refrigerator car, a speed- changing mechanism 5 to change the speed of an engine 3 for traveling and transmit the changed speed to the compressor 11, a detecting means 17 to detect whether or not the refrigerator car is stopped, a speed-changing means 21 to increase the speed of the compressor 11 by changing the speed of the speed- changing mechanism 5 by receiving the signals from this detecting means while the refrigerator car is stopped.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a refrigerating machine for refrigerating vehicles.

[0002]

2. Description of the Related Art Japanese Patent Application Laid-Open No. 2-305327 discloses an accessory drive device 201 with an acceleration control function, which is constructed as shown in FIG.
Is listed. This is the engine 2 via an accessory drive device 203 having an input pulley and an output pulley of an accessory such as a generator, a pump, or a compressor for a refrigerating vehicle.
In order to transmit the driving force of the engine 05, the auxiliary device drive device 203 is shifted according to the rotational speed of the engine 205 to set the rotational speed of the auxiliary device to an appropriate range, and the auxiliary device is set to the engine when the vehicle is accelerated. It is configured to disconnect from the load. FIG. 3 shows the configuration of this device 201 which drives the generator 207 and the cooler compressor 209.

[0003]

As shown in FIG. 3, the device 201 includes a control circuit 211, a switching circuit 213,
An opening / closing circuit 215, a controller 217, a rotation speed sensor that detects the engine rotation speed, an acceleration sensor that detects acceleration, and the like are provided. The control circuit 211 outputs a signal to the switching circuit 213 at a predetermined engine speed according to the signal from the rotation speed sensor, and the switching circuit 213 shifts the accessory drive device 203 via the actuator 219.
A signal from the acceleration sensor outputs a signal to the switching circuit 213, the opening / closing circuit 215, and the controller 217 at a predetermined acceleration to disconnect the generator 207 and the compressor 209 from the engine 205. Disconnect the load of 209.

As described above, the device 201 requires the complicated circuits and sensors as described above in order to control the auxiliary machine according to the engine speed, and thus the structure is complicated and the reliability thereof is high. It is easy to decrease and expensive.

Therefore, an object of the present invention is to provide a refrigerating device for a refrigerating vehicle, which has a simple and inexpensive structure and can prevent the temperature inside the refrigerator from rising while the vehicle is stopped or when the door of the freezer is opened. .

[0006]

A refrigerating apparatus for a refrigerating vehicle according to the present invention includes a compressor for cooling a freezer of a refrigerating vehicle, a speed change mechanism for changing the speed of rotation of a running engine and transmitting the speed to the compressor. It is provided with a detection means for detecting whether or not the vehicle is stopped, and a shift operation means for receiving a signal from the detection means and operating the transmission mechanism to shift the speed of the refrigeration vehicle to increase the speed of the compressor. Characterize.

[0007]

The detecting means for detecting the stopped state of the refrigerating vehicle includes, for example, a switch interlocking with a hand brake operated when the vehicle is stopped, and the door of the refrigerating vehicle is opened and closed while the vehicle is stopped. There are switches that work together.

In the case of a door switch, this switch is turned on when the door is opened, and the gear change operation means shifts the speed change mechanism to the speed increasing side in response to the signal, speeds up the engine rotation during idling, and transmits it to the compressor to improve the refrigerating capacity. Increase.

Further, when the side brake switch is used, the speed of the compressor is increased in the same manner as described above by operating the side brake when the vehicle is stopped. With this configuration, it is possible to prevent the temperature inside the refrigerator from rising when the door of the freezer cannot be opened but the vehicle is stopped for a long time.

As described above, the compressor can be accelerated when it is desired to increase the refrigerating capacity of the freezer. Therefore, a large compressor is not required, the engine load is reduced, and the weight and cost are reduced. Further, unlike the conventional example of FIG. 3, a complicated control circuit is not required, so that the structure is simple, the reliability is high, and the cost is low.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment will be described with reference to FIGS.
FIG. 1 shows the configuration of a refrigerating machine 1 for a refrigerating vehicle of this embodiment,
FIG. 2 is a table showing the operation of this device 1.

As shown in FIG. 1, the device 1 includes an engine 3 and
Two-stage switching transmission mechanism 5, a belt transmission mechanism 7 that connects the engine 3 and the transmission mechanism 5, an electromagnetic clutch 9 that connects and disconnects the belt transmission mechanism 7 and the transmission mechanism 5, a compressor 11 for a freezer, and a transmission. A reversible rotation motor 13 that shifts the mechanism 5, a relay 15 that switches the rotation direction of the motor 13, and a door switch 17 that interlocks with the opening and closing of the freezer door.
And a temperature sensor 19 in the freezer.

When the electromagnetic clutch 9 is turned on, the rotation of the engine 3 causes the compressor 11 to rotate via the belt transmission mechanism 7, the electromagnetic clutch 9 and the speed change mechanism 5. When the electromagnetic clutch 9 is turned off, the compressor 11 is separated from the engine 3 and stops rotating, and the load on the engine 3 is reduced.

The door switch 17 as a detecting means outputs a signal to the relay 15 when the door of the freezer is opened, and the relay 15 switches the rotation direction of the motor 13 to switch the transmission mechanism 5 to the high speed stage. The speed of the compressor 11 is increased to improve the refrigerating capacity and prevent the temperature of the freezer from rising. The temperature sensor 19 turns on the electromagnetic clutch when the internal temperature of the freezer becomes higher than the set temperature.
Set to N. The gear shift operation means 2 includes the relay 15 and the motor 13.
Make up 1.

Next, No. 1 in FIG. The operation of the device 1 will be described below.

No. 1 is a case where the refrigerating car is stopped and the door of the freezer is opened to load and unload luggage. At this time, the engine 3 is in an idling state. At this time, the transmission mechanism 5 is switched to the high speed stage by the door switch 17,
When the internal temperature is higher than the set temperature, the temperature sensor 19 connects the compressor 11 side and the engine 3 side via the electromagnetic clutch 9 as described above. Thus, the compressor 11
Prevents the temperature inside the refrigerator from rising due to the increased speed of rotation and opening of the door. Further, immediately after the door is opened, or when the time for opening the door is short and the temperature inside the refrigerator is lower than the set temperature, the temperature sensor 1
Since the electromagnetic clutch 9 is turned off by 9, the compressor 11 does not rotate and the engine 3 is not loaded.

No. 2 is when the vehicle is stopped with the door of the freezer closed, and since the door switch 17 does not operate, the speed change mechanism 5 is in the low speed stage and the temperature inside the refrigerator is lower than the set temperature. 9 is O
Since it is set to FF and the compressor 11 is separated from the engine 3, no load is applied to the engine. When the vehicle is stopped for a long time and the temperature inside the storage compartment becomes higher than the set temperature, the temperature sensor 19 turns on the electromagnetic clutch 9 to rotate the compressor 11 to lower the temperature inside the storage compartment to the set temperature or lower.

No. 3 is a state in which the refrigerating vehicle is traveling and the freezer is closed, and the door switch 17 does not operate, so the speed change mechanism 5 is in the low speed stage. When the internal temperature is lower than the set temperature, the temperature sensor 19 turns off the electromagnetic clutch 9 to reduce the engine load. When the inside temperature is higher than the set temperature, the electromagnetic clutch 9 is turned on and the compressor 11 is rotated, so that the inside temperature is lowered to the set temperature or lower.

Thus, the refrigerating apparatus 1 for a refrigerating vehicle is constructed.

Since the apparatus 1 can increase the rotation speed of the compressor 11 when it is desired to enhance the refrigerating capacity of the freezer as described above, it is not necessary to make the compressor large, and the engine load is reduced accordingly and the weight is reduced. It will be cheaper. Further, unlike the conventional example of FIG. 3, various control circuits for control are unnecessary, so that the structure is simple, the reliability is high, and the cost is low.

If a switch interlocking with the handbrake is used as the detecting means for detecting the stopped state of the freezer, it is possible to prevent the inside temperature from rising when the vehicle is stopped with the freezer closed.

[0022]

Since the refrigerating apparatus for a refrigerating vehicle according to the present invention is provided with the detecting means for detecting the stopped state of the refrigerating vehicle, the speed of the compressor is increased while the refrigerating vehicle is stopped. As the load is reduced,
Since a complicated control circuit is unnecessary, the structure is simple, the reliability is high, and the cost is low.

[Brief description of drawings]

FIG. 1 is a block diagram showing a configuration of an example.

FIG. 2 is a table showing the operation of the embodiment of FIG.

FIG. 3 is a block diagram showing a configuration of a conventional example.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Refrigeration device for refrigeration vehicles 3 Engine 5 Transmission mechanism 11 Compressor 17 Door switch 21 Shift operation means

Claims (1)

[Claims] 1. A compressor for cooling a freezer for a refrigerating vehicle, a speed change mechanism for shifting the rotation of a running engine and transmitting the rotation to the compressor, and a detection means for detecting whether or not the refrigerating vehicle is stopped. A refrigerating machine for a refrigerating vehicle, comprising: a shift operation means for changing the speed of the transmission mechanism to increase the speed of the compressor by receiving a signal from the detecting means.