JPH06110560A - Digital display type thermostat - Google Patents

Abstract

PURPOSE:To provide the thermostat controlling the operation of a cooler or a heater by comparing a previously set temperature with a measured temperature detected by a temperature sensor. CONSTITUTION:This thermostat is provided with a setting activation key 13a for operating a temperature setting function, an up key 13b and a down key 13c for stepwise increasing or decreasing the set temperature, a display part 14 for displaying the set temperature or the measured temperature, a memory 17 for storing the set temperature, and a control part 8 for displaying the set temperature stored in the memory on the display part when the setting activation key is set in the operation state, stepwise increasing or decreasing the set temperature displayed in the display part when the up key or the down key becomes the operation state in such a state so as to store the increased or decreased set temperature in the memory and further controlling so as to display the measured temperature at the display part when the setting activation key is not operated for over prescribed time.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a refrigerator or a heater of a facility or device, such as a refrigerator, a food processing machine, a showcase for food, a live fish tank, a greenhouse, a greenhouse, etc. The present invention relates to a thermostat for controlling on / off of the thermostat, and more particularly to a digital display type thermostat for digitally displaying a set temperature and a measured temperature detected by a temperature sensor.

[0002]

2. Description of the Related Art As a conventional example of this type of thermostat, a front panel 2 of a thermostat 1 is shown in FIG.
In addition, four non-locking push-type keys 3a to 3d for setting and inputting the temperature and a display unit 4 for displaying the set temperature are provided. The keys 3a of the four keys are function keys, and function as a switch for switching between the display of the measured temperature by the temperature sensor and the display of the set temperature when the desired set temperature is input. The key 3b is an up key used when it is desired to raise the set temperature above the display temperature, and the key 3c is a down key used when the set temperature is desired to be lowered below the display temperature. Key 3d
Is a confirm key for confirming the set temperature when it is set on the display unit 4 and inputting it to the memory for comparison with the measured temperature of the temperature sensor. When this conventional device is used, a predetermined initial value is usually displayed on the display unit 4 by pressing the function key 3a.
If the temperature to be set is higher than this initial value, press the up key 3b, and if it is lower than the initial value, press the down key 3c to adjust the number on the display unit 4 to the desired temperature, and after this setting is completed. By pressing the enter key 3d, the temperature setting is completed.

[0003]

As can be understood from the above, such a conventional example has the following problems. One is that even if the set temperature is adjusted by the up key 3b or the down key 3c, the set temperature does not substantially function unless the enter key is pressed.
If the user forgets to press the enter key 3d, there is a serious problem that the thermostat 1 does not operate to control to a predetermined temperature. In addition, when setting a new temperature or resetting it due to a power failure, there are two
In other words, starting from 0 ℃ makes the operation troublesome, so
Although the initial value of the predetermined temperature is automatically set, even in this case, the difference from the set temperature must be adjusted to the predetermined temperature by the up key 3b or the down key 3c. was there.

The present invention has been made to solve the above-mentioned problems of the conventional apparatus, and when the operator finishes the operation of setting the desired temperature, the setting of the set temperature is automatically completed. This is to eliminate the need to operate the enter key 3d unlike the conventional device. Further, the present invention is to maintain the set temperature unless the set temperature is changed by the next temperature setting. When the temperature is reset due to a power failure or the like like the conventional device, the initial value is displayed on the display unit 4. It does not require re-setting for displaying.

[0005]

SUMMARY OF THE INVENTION The present invention provides a thermostat for turning on / off a control switch of a cooling machine or a heating machine according to a result of comparison between a preset temperature and a measurement temperature detected by a temperature sensor. ,
A non-lock type setting start key for activating the temperature setting function, a non-lock type up key for increasing the set temperature stepwise, a non-lock type down key for decreasing the set temperature stepwise, and the set temperature or A display unit that displays the measured temperature, a memory that stores the set temperature, and the set temperature that is stored in the memory when the setting start key is in the operating state, and the state is displayed on the display unit. In step 3, when the up key is activated, the set temperature displayed on the display unit is increased stepwise, and the increased set temperature is stored in the memory, and the setting activation key is activated. If the set temperature stored in the memory is displayed on the display unit and the down key is activated in that state, the table is displayed. The set temperature displayed on the unit is gradually reduced, and the reduced set temperature is stored in the memory, and when the set activation key is not in operation for a predetermined time or longer, the measurement is displayed on the display unit. And a control unit for controlling the temperature to be displayed.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 shows a thermostat body 11 according to the present invention.
13a to 13c showing the panel surface 12 on the front side of the
Is a non-locking push-type key, and 13a is operated when setting the temperature with the setting start key or confirming the setting temperature. 13b is an up key which is operated to increase the set temperature, 13c is a down key which is operated to decrease the set temperature.
Each time the button is pressed, a predetermined unit temperature, for example, 1 ° C. or 0.5 ° C. is increased or decreased, and the unit temperature can be increased or decreased stepwise depending on the number of times the button is pressed. Reference numeral 14 is a display unit for digitally displaying the set temperature or the measured temperature detected by the temperature sensor.

FIG. 2 is a functional block diagram of an embodiment of the present invention. When the thermostat is operating at a preset temperature, the temperature sensor 1 is displayed on the display unit 14.
The temperature detected by 5 is displayed via the sensor circuit 16 and the control unit 8. The set temperature is stored in the control set value memory 17, and the set temperature and the temperature sensor 1 read by the sensor circuit 16 are set.
The temperature detected in 5 is compared by the comparator 18 of the control unit 8, and if this thermostat functions as a cooling device, the cooling device is turned on by the control switch 20 when the sensor temperature is higher than the set temperature. When the temperature is low, conversely, when the temperature is low, the cooling device is turned off by the control switch 20 to stop the cooling, and the temperature control target device (facility) is operated to match the set temperature.

Next, the case of changing the set temperature will be described. First, the setting start key 13a is pressed. By this operation, the set temperature stored in the control set value memory 17 is read out to the change set value memory 19, and
Up key 1 for the set temperature of the set value memory 19 for change
3b and the down key 13c can be used for change, and switching control is performed so that the temperature of the change set value memory 19 is displayed on the display unit 4. Therefore, the setting activation key 1
By pressing and releasing the up key 13b or the down key 13c once while pressing 3a, it is possible to adjust the set temperature in steps of a predetermined unit temperature, for example, 1 ° C or 0.5 ° C. The temperature is set to a predetermined temperature by repeating pressing as many times as necessary for the change.
Since the changed temperature is displayed on the display unit 14 each time the pressure is pressed, it is possible to operate while confirming the temperature being set.

Up key 13b or down key 13c
When the temperature setting is completed by, the pressing of the setting start key 13a is released. By releasing this, the set value memory for change 1
The temperature set to 9 is written in the control set value memory 17 and changed to the new set temperature, and the up key 13b is pressed.
Also, the temperature setting operation from the down key 13c is disabled. Also, the display content of the display unit 14 changes from the set temperature to the display of the temperature detected by the temperature sensor, and the initial state is restored. The return operation described above is performed by the setting start key 13a.
It is a preferable control method from the viewpoint of preventing malfunction that the device is operated after a predetermined time, for example, about 3 seconds has elapsed after the pressing of the button has been released. In addition, the control set value memory 17
In order to maintain the storage of the set temperature data even during a power failure, it is preferable to prepare for a power failure with a backup power supply. Further, in the present embodiment, two memories, that is, the control set value memory 17 and the change set value memory 19 are used. However, the set temperature of the control set value memory 17 is directly changed so that one memory is used. You may make it perform using. Although the control set value memory 17 is provided independently, it may be provided in the control unit 8 integrally with the change set value memory 19.

FIG. 3 is a flow chart of the above embodiment.
When the power is turned on, the operating state is entered, and it is determined whether or not the setting start key 13a is pressed. If not pressed, if the non-pressed time is 3 seconds or more,
The sensor temperature detected by the temperature sensor 15 is displayed. When the setting activation key 13a is pressed, the data of the control setting value memory 17 is read and written in the changing setting value memory 19, and the set temperature is changed to the sensor temperature and displayed. And the setting activation key 13a
When the up key 13b or the down key 13c is pressed while is being pressed, the set temperature is increased or decreased by 1 ° C., and the change set value memory 19 is rewritten each time.
Therefore, for example, when the initial data (previous set temperature) is increased by 5 ° C., the addition of 1 ° C. is repeated 5 times by pressing the up key 13b 5 times, and the change set value memory 19
Is rewritten, and this data (new set temperature) is displayed on the display unit 14.

When a new set temperature is set and the pressing of the setting start key 13a is released, a timer device (not shown) operates and after 3 seconds elapses, the display temperature changes to the set temperature and the sensor temperature is displayed. Is displayed. At the same time, it is determined whether the data in the control set value memory 17 is the same as the data in the change set value memory 19, and if they are different, the data in the control set value memory 17 is changed to the data in the change set value memory 19. It is changed and stored. Then, the changed set temperature and the sensor temperature are compared, and the temperature is controlled by the control switch 20 based on the result. When the thermostat checks the set temperature during temperature control, the set temperature stored in the control set value memory 17 is displayed on the display unit 14 by pressing the setting start key 13a. I can know.

[0012]

As described above, according to the present invention, the temperature of the display unit is changed from the sensor temperature to the set temperature by the pressing operation of the setting start key, and the up key and the down key for adjusting the temperature setting are pressed. It is possible to set a predetermined temperature while watching the change in the set temperature by operation, and by setting the predetermined temperature and then releasing the pressing operation of the setting start key, the set temperature is compared with the sensor temperature. Since the temperature setting is completed by being stored in the setting value memory for use, it is possible to prevent the human-made operation error of forgetting the setting as in the conventional case. Also, when resetting the temperature due to a power failure, etc., the latest preset temperature is always stored, so no operation for resetting is required. Further, conventionally, four operation keys for setting the temperature were required, but according to the present invention, the number of operation keys can be reduced to three, and the thermostat can be further downsized. At the same time, it has the effect of reducing the size and weight.

[Brief description of drawings]

FIG. 1 is an explanatory diagram of an operation panel surface of a thermostat according to an embodiment of the present invention.

FIG. 2 is a functional block diagram of an embodiment of the present invention.

FIG. 3 is a flow chart diagram of an embodiment of the present invention.

FIG. 4 is an explanatory view of an operation panel surface of a conventional thermostat.

[Explanation of symbols]

 1, 11 Thermostat body 2, 12 Thermostat body panel surface 3a Function keys 3b, 13b Up key 3c, 13c Down key 4, 14 Display section 8 Control section 13a Setting start key 15 Temperature sensor 16 Sensor circuit 17 Setting value memory for control 18 comparator 19 setting value memory for change 20 control switch

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Koji Kosaka 2-55-5 Wakamiya, Nakano-ku, Tokyo Inside Sagimiya Manufacturing Co., Ltd.

Claims (1)

[Claims] 1. According to a comparison result between a preset temperature and a measurement temperature detected by a temperature sensor,
In a thermostat that turns the control switch of the cooler or heater on and off, a non-locking type setting start key that activates the temperature setting function, a non-locking type up key that increases the set temperature stepwise, and the set temperature A non-locking down key that decreases in a stepwise manner, a display unit that displays the set temperature or the measured temperature, a memory that stores the set temperature, and a memory that stores the set activation key when the set activation key is in an operating state. The stored set temperature is displayed on the display unit, and when the up key is activated in that state, the set temperature displayed on the display unit is increased stepwise, and the increased set temperature is To be stored in memory,
Further, the set temperature stored in the memory is displayed on the display unit when the setting start key is in an operating state,
In that state, when the down key is activated, the set temperature displayed on the display section is gradually reduced,
A control unit that causes the reduced set temperature to be stored in the memory, and that controls the display unit to display the measured temperature when the set activation key has not been operated for a predetermined time or more; Digital display type thermostat, which is equipped with.