JP2543592Y2 - Temperature recording device - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a temperature recording device used for recording the temperature inside a refrigerator of a marine container refrigeration system.

[0002]

2. Description of the Related Art A conventional automatic equilibrium type temperature recording apparatus used for a refrigeration apparatus for a marine container is constructed as shown in FIG. That is, the temperature recording device includes an ambu 2 to which a signal from the temperature sensor 1 is input, a changeover switch 5 for connecting the amplifier 2 directly or via an integration circuit 3 to a servo amplifier 4, and a deviation output by the servo amplifier 4. The servo motor 6 is supplied and drives a recording pen (not shown). The potentiometer 7 is connected to the servo motor 6 and feeds back a signal indicating the position of the recording pen to the servo amplifier 4. The changeover switch 5 is provided with a changeover circuit 9 which receives a signal indicating whether or not the temperature in the freezer output from the controller 8 is within the set temperature range.
Switching is performed on the basis of a command from the user.

However, at the start of operation of the refrigeration system,
Since the internal temperature is high and out of the set temperature range, the switch 5 is switched to the contact a side by the command of the switching circuit 9 which receives the signal from the controller 8, and the amplifier 2 and the servo are connected without the integration circuit 3. The amplifier 4 is connected. Therefore, the signal from the temperature sensor 1 is amplified by the amplifier 2 and sent to the servo amplifier 4. Servo amplifier 4
A signal from the amplifier 2 and a feedback signal from the potentiometer 7 indicating the position of the recording pen are input, and the servo motor 6 is driven by a deviation signal output . Servo motor 6 drives a recording pen, not shown, the servo amplifier 4
Is moved in the direction of the position indicated by the deviation signal. When the recording pen moves to the position indicated by the deviation signal of the servo amplifier 4, the deviation output of the servo amplifier 4 becomes zero and stops at that position.

When the inside of the refrigerator is cooled to fall within the set temperature range, the changeover switch 5 is switched to the contact b side by a command of the changeover circuit 9 which receives a signal from the controller 8, and is switched through the integration circuit 3. The amplifier 2 and the servo amplifier 4 are connected. Hereinafter, the recording pen is driven in the same manner.

Here, when the changeover switch 5 is switched to the contact a side, the amplifier 2 and the servo amplifier 4 are directly connected, so that the recording pen is driven with a quick response of, for example, a time constant of 20 seconds, and the other hand. When the changeover switch 5 is switched to the contact b side, the amplifier 2 and the servo amplifier 4 are connected via the integrating circuit 3, so that the recording pen is driven with a slow response of, for example, a time constant of 20 minutes. become. Therefore, as shown in FIG. 3, a state in which the temperature in the refrigerator suddenly changes, such as when starting the operation of the refrigeration system, is accurately recorded, and when the temperature in the refrigerator is within the set temperature range, the temperature is stable and stable. Records can be made.

[0006]

Normally, in a refrigeration system for a marine container, a set temperature in a refrigerator is changed according to the contents of an object to be cooled, and various modes, for example, a chiller for cooling the refrigerator to 0 ° C. The operation is performed in a mode such as a frozen mode in which the inside of the refrigerator is cooled to −20 ° C. Here, the variation of the actual internal temperature within each set temperature range varies depending on the operation mode, but in the conventional temperature recording device, the time constant of the integrating circuit 3 is the same even if the operation mode is different. Is set to a value. For this reason, in the case of a specific operation mode (for example, frozen), relatively smooth temperature recording is performed with an appropriate time constant as shown in FIG. 4, but in the case of another operation mode (for example, chilled), As shown in FIG. 5, the time constant did not match, so that the temperature change was not smoothed and the temperature was recorded with a large ripple.

The present invention has been made in view of the above points, and provides a temperature recording device capable of performing stable temperature recording even when the operation mode of the refrigeration system is different, for example. With the goal.

[0008]

SUMMARY OF THE INVENTION According to the present invention , the temperature in a refrigerator is controlled.
An amplifier and a temperature sensor signal for detection
Servo that drives the servo motor that drives the recording pen
In a temperature recording device provided with an amplifier, the amplifier
And a plurality of servo amplifiers provided in parallel between the
Multiple integrals with different time constants matched for each driving mode
Circuit and an operation mode for setting the inside of the chamber to an arbitrary set temperature.
And selecting one of the plurality of integration circuits corresponding to the
First switching means connected to the temperature sensor and the temperature sensor
The detected temperature in the refrigerator is determined by the first switching means.
Set temperature range of operation mode corresponding to selected integration circuit
If it is within, it is selected by the first switching means.
Connect the integration circuit and the servo amplifier, and
If it is out of the range, the amplifier and the servo amplifier
And second switching means for connecting

[0009]

[Action] With such a configuration, when the refrigeration system is switched to an arbitrary operation mode, depending on the operating mode
An integrating circuit having a time constant is selected by the first switching means.
Is connected to the amplifier, and under the operation according to this operation mode, the second switching is performed according to whether the internal temperature is within the set temperature or not.
Means selects the servo amplifier by the first switching means.
Connected to either the integrating circuit or the amplifier. When the inside temperature is outside the set temperature range, the amplifier and the servo amplifier are directly connected. When the inside temperature is within the set temperature range, an integral having a time constant according to the operation mode at this time. Connect the amplifier and the servo amplifier via the circuit.

With this arrangement, when the internal temperature is within the set temperature range, the time constant is changed in an operation in which the actual internal temperature fluctuates rapidly (for example, the set temperature is maintained by turning on / off the compressor). Is responded at a relatively high speed via the small integrator circuit. On the other hand, in an operation mode in which the actual change in the internal temperature is slow, a response is made at a relatively low speed via an integrating circuit having a large time constant. Therefore, stable temperature recording is performed.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a block diagram showing a configuration of a temperature recording device according to the embodiment. It should be noted that FIG.
The same parts as those in the block diagram shown in FIG. The temperature recording apparatus according to the embodiment includes a first changeover switch 21 connected to the amplifier 2 and a second changeover switch 23 connected to the servo amplifier 4.
The amplifier 2 and the servo amplifier 4 are connected directly or via an integration circuit described later. The first changeover switch 21 is connected to the first
The switching operation is instructed by the switching circuit 22. The first switching circuit 22 receives from the controller 8 a switching signal corresponding to an operation mode for cooling the freezer to an arbitrary set temperature, and instructs the first switching switch 21 to switch according to the switching signal. The switching operation of the second changeover switch 23 is instructed by the second changeover circuit 24. The second switching circuit 24 receives a signal from the controller 8 as to whether or not the temperature in the freezer is within the set range, and in response to the signal, the second switching switch 23
Is switched. The amplifier 2 and the servo amplifier 4
Between the first integration circuits having different time constants.
25, a second integration circuit 26 is provided in parallel. In the first integration circuit 25 and the second integration circuit 26, a time constant that matches each operation mode is set in advance.
Have a larger time constant than the second integration circuit 26. Next, the operation of the embodiment will be described.

For example, when the cooling device is switched to a chilled operation in order to cool the inside of the refrigerator to a set temperature of 0 ° C.,
First switching circuit 22 to which a signal from controller 8 is input
Indicates that the first changeover switch 21 is switched to the contact C side. When the operation is switched to the frozen mode in order to cool the inside of the refrigerator to the set temperature of −20 ° C., the first changeover switch 21 switches the contact f in accordance with an instruction from the first changeover circuit 22.
It is switched to the side. When the internal temperature is outside the set temperature range during the operation in the chilled mode, the second switching circuit 24 instructs the second switching switch 23 to perform switching in response to a signal from the controller 8. Thereby, the second changeover switch 23 is switched to the contact g side. Conversely, when the internal temperature is within the set temperature range, the second switch 23 is switched to the set h side in accordance with an instruction from the second switch circuit 24.

Next, when the internal temperature is outside the set temperature range during operation in the frozen mode, the second switching circuit 24 switches to the second switching switch 23 in response to a signal from the controller 8. Instruct. Thereby, the second changeover switch 23 is switched to the contact i side. Conversely, when the internal temperature is within the set temperature range, the second changeover switch 23 is switched to the contact j side in accordance with an instruction from the second changeover circuit 24.

Thus, when the internal temperature is out of the set temperature range in both the chilled mode and the frozen mode, the amplifier 2 and the servo amplifier 4 are connected to each other. Since the recording pen (not shown) responds at a high speed, it can accurately record a state in which the temperature in the refrigerator suddenly changes, such as when the refrigeration apparatus starts operating.

In the chilled mode and the frozen mode, when the internal temperature is within each set temperature range, the chilled mode is set via the first integration circuit 25 in the chilled mode.
In the frozen mode, the amplifier 2 and the servo amplifier 4 are connected via the second integration circuit 26, respectively. Therefore, in a chilled mode in which the actual temperature inside the refrigerator changes slowly, the recording pen responds at a relatively slow speed because of the intervening first integration circuit 25 having a large time constant. On the other hand, in the frozen mode in which the actual temperature in the refrigerator changes rapidly, the recording pen responds at a relatively high speed because the second integrating circuit 26 having a small time constant is interposed. That is, in any case, stable recording of the internal temperature can be performed.

In the above embodiment, two integrating circuits 25 and 26 are interposed between the amplifier 2 and the servo amplifier 4. However, three integrating circuits are provided depending on the number of operation modes. The above configuration may be adopted. Further, the first switching circuit 22 and the first switching switch 21, and the second switching circuit 24 and the second switching switch can be replaced with microcomputers.

[0017]

As described above, according to the present invention, two or more integrating circuits having different time constants are interposed between an amplifier and a servo amplifier, and a switching signal of an operation mode and a temperature in a freezer are provided by a controller. When the temperature inside the refrigerator is out of the set temperature range, the amplifier and the servo amplifier are directly connected to each other to input a signal indicating whether the temperature is within the set temperature range. Can be recorded at high speed to accurately record the state of sudden changes in the internal temperature,
When the temperature in the refrigerator is within the set temperature range, the amplifier and the servo amplifier are connected via an integrating circuit having a time constant according to the operation mode, and the recording pen is operated at an appropriate response speed.
It can be driven . Therefore, stable temperature recording can be performed even when the operation mode is different.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a configuration of a temperature recording device according to an embodiment of the present invention.

FIG. 2 is a block diagram showing a configuration of a conventional temperature recording device.

FIG. 3 is a diagram illustrating a relationship between the temperature in a freezer and an elapsed time for explaining a conventional temperature recording device.

FIG. 4 is a diagram showing the relationship between the freezer temperature and the elapsed time for explaining a conventional temperature recording device.

FIG. 5 is a diagram illustrating a relationship between the temperature in a freezer and an elapsed time for explaining a conventional temperature recording device.

[Explanation of symbols]

1: temperature sensor, 2: amplifier, 4: servo amplifier, 6:
Servo motor, 7 potentiometer, 8 controller, 21 first switch, 22 first switch, 23 second switch, 24 second switch, 25 first integrating circuit, 26 second Integrator circuit.

 ──────────────────────────────────────────────────続 き Continued on the front page (56) References Japanese Utility Model Hei 1-105828 (JP, U) Japanese Utility Model Hei 1-105826 (JP, U)

Claims (1)

(57) [Scope of request for utility model registration] 1. A temperature sensor for detecting a temperature in a refrigerator.
And a driver for driving the recording pen.
Temperature recorder with a servo amplifier that drives the servo motor
In the recording device, provided in parallel between the amplifier and the servo amplifier
WasMatched for multiple driving modesHave different time constants
A plurality of integration circuits; and an operation mode in which the inside of the refrigerator is set to an arbitrary set temperatureBefore responding to
Select one of the plurality of integrating circuits and connect to the amplifier
First switching means for performing Said Temperature in the chamber detected by a temperature sensorBefore
Corresponding to the integration circuit selected by the first switching means.
When the temperature is within the set temperature range of the operation mode, the first switching is performed.
The integration circuit selected by the means and the servo amplifier;
If the temperature is outside the set temperature range,
Second switching means for connecting the servo amplifier and the servo amplifier;With
EquipmentWasA temperature recording device, characterized in that: