JPS5844170B2 - temperature control device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a temperature control device used in heating and cooling equipment.

Conventionally, temperature control devices used in heating and cooling equipment, such as air conditioners, output an on signal when the temperature of the conditioned room reaches a first set value, and output an off signal when the temperature reaches a second set value. Turn on the air conditioner.

It was meant to be controlled off.

In other words, since the temperature factor was the only factor that fed back the demand side conditions to the supply side, it was not possible to perform appropriate output capacity and operation on the supply side in accordance with the load conditions.

This will be explained with reference to FIG.

Figure 1 is a temperature change diagram of the heated room during heating operation.
is the first set point temperature, that is, the operation start temperature of the heater, TB
is the second set point temperature, that is, the temperature at which the heater is shut down.

Tc is the operating temperature peak of the temperature control device, Tc-TB-TA
It is usually set at 3°C.

In the characteristic curve A, sections A and A indicate the operating time and stopping time of the heater, respectively.

In the case of this characteristic curve A, the temperature change becomes extremely gradual in the latter half of the operating time A.

This type of operation is often seen when the load is large compared to the capacity of the heater, and more than half of the operating time is spent raising the room temperature slightly.

This results in the consumption of a large amount of power or fuel to obtain a small temperature.

- In the case of force characteristic curve C, the output capacity of the heater is too large compared to the heating load, and such a case is also not desirable from the point of view of effective energy utilization.

This invention was made in view of the above points, and it detects the rate of temperature change in the environment to be cooled and heated, detects this rate of temperature change, and warns when the rate of temperature change deviates from the rate of change within a preset range. This operates management means such as an alarm that alerts the user or an output controller that changes the output capacity of the air conditioner.

The details of this invention will be explained below with reference to the drawings.

FIG. 2 is a block diagram showing an embodiment of the present invention, in which 1 is a temperature detection element, 2 is an air conditioner, and in this embodiment, a first set value and a second set value are used to control the operation of the heater. The temperature setting section 3 compares the output from the temperature detection element 1 with the first setting value from the temperature setting section 2, and when the output of the temperature detection element 1 is smaller, a temperature setting section 3 generates an on signal. Similarly, the comparator 1 and 4 compare the output from the temperature detection element 1 and the second set value from the temperature setting section 2, and generate an off signal when the output of the temperature detection element 1 is larger. Comparator 2, 5 is ON from the first and second comparators,
The heater is turned on by the off signal.

The on/off driver 6 to turn off is a heater, 7 is its power supply,
Reference numeral 8 denotes a switch that turns on and off the power supply to the heater 6 by the on/off driver 5.

9 is an arithmetic circuit unit which inputs the output of the temperature detection element 1 and calculates the change in output dT/dt (where T is the output difference and t is time), that is, the temperature change rate in a certain minute time; 10 is the temperature change rate; 11 is an upper limit reference setting section for setting the upper limit of the temperature change rate; 11 is a lower limit reference setting section for setting the lower limit of the temperature change rate;
2 is the output of the upper limit reference setting section 10 and the arithmetic circuit section 9.
An upper limit change rate comparing section 13 compares the output of the arithmetic circuit section 9 with the output of the arithmetic circuit section 9 and generates a positive output signal when the output of the arithmetic circuit section 9 is larger.
a lower limit change rate comparison section which compares the output of the arithmetic circuit section 9 with the output of the arithmetic circuit section 9 and generates a negative output signal when the output of the arithmetic circuit section 9 is smaller; It is an alarm device.

In the apparatus configured as described above, the temperature of the room heated by the heater 6 is detected by the temperature detection element 1,
It is compared with the first set value of the temperature setting section 2, and when it is smaller than the value, the first comparator 3 generates an ON signal.
The switch 8 is turned on and the heater 6 is operated.

When the room temperature rises due to the operation of the heater 6 and becomes higher than the second set value, an off signal is output from the second comparator 4, and the off driver 5 turns off the switch 8 to turn off the heater 6.
stop operating.

Then, when the room temperature drops again and becomes below the first set value, it turns on.
The switch 8 is turned on by the off driver 5, and the heater 6 is operated again.

In this way, normally, during the operating temperature of the temperature control device, Tc
The heater 6 is turned on and off to control the operation of the heater 6.

- The force calculation circuit section 9 constantly calculates the output change rate dT/dt, that is, the temperature change rate, based on the output from the temperature detection element 1, and uses this temperature change rate in the change rate comparison section 12.13 to the reference setting section 10, The upper and lower temperature change rates from No. 11 are compared.

Therefore, when the heating load is larger than the output capacity of the heater, as in characteristic A shown in FIG. 1, the temperature T becomes smaller than the lower limit temperature change rate.

At the point in time, a negative output signal is output from the lower limit rate of change comparator 13, which activates the alarm 14 to issue an alarm.

Furthermore, when the heating load is small as shown in characteristic C in FIG. Activate it and issue an alarm to let us know that the output capacity of the heater 6 is too large.

In this way, if the output capacity of the heater 6 is inappropriate compared to the heating load, an alarm is issued to notify the user.

FIG. 3 shows another embodiment of the present invention.
An output controller 15 is provided instead of the output controller 15.

This output controller 15 increases the output capacity of the heater 6 when the heating load is too large, that is, when a negative output signal is input from the lower limit rate of change comparator 13, and when the heating load is too small, that is, the upper limit When a positive output signal is input from the rate of change comparison section 12, the output capacity of the heater 6 is reduced.

In this way, the output capacity of the heater 6 is controlled according to the heating load.

FIG. 4 shows an intermediate temperature setting section 16 for setting a third set value between the first and second set values in the embodiment shown in FIG. An intermediate comparator 1 that compares and outputs an output when the output of the temperature detection element 1 is large.
7 and an AND gate 18 which inputs the outputs of the upper or lower limit rate of change comparison sections 12 and 13 and the output of the intermediate comparison section 1T, and the alarm 14 is operated through this AND gate 18. be.

Note that 19 is an or gate.

By doing this, as shown in FIG. 5, an alarm is issued when the room temperature has risen to a level at which the user does not feel discomfort, which is convenient for the user.

FIG. 6 shows the embodiment shown in FIG. 2 except that a switching section 20 that can input the output of the temperature detection element 1 to the arithmetic circuit section 9 is provided.

With this configuration, the arithmetic circuit section 9 and the alarm 14 can be operated or not operated freely.

Furthermore, it is convenient for output adjustment if the operating sound of the alarm 14 is made different for when the upper limit value of the temperature change rate is exceeded and when the lower limit value is exceeded.

In addition, in the above embodiments, a heater was described, but
Needless to say, this can be applied to air conditioners.

As described above, the present invention detects the temperature of the object to be heated and cooled by the air conditioner, and in addition to performing on/off control, calculates the rate of change in temperature of the object to be cooled and heated, and calculates the temperature change between the air conditioner and the output of the air conditioner. Since the relationship can also be detected, it is possible to know whether the output of the air conditioner/heater is appropriate for the load.

[Brief explanation of the drawing]

Fig. 1 is a temperature change characteristic diagram of a heated room, Fig. 2 is a block diagram showing one embodiment of the present invention, Fig. 3 is a block diagram showing another embodiment of the invention, and Fig. 4 is a block diagram showing another embodiment. FIG. 5 is a temperature change characteristic diagram for explaining the operation of the embodiment shown in FIG. 4, and FIG. 6 is a block diagram showing still another embodiment. The same reference numerals in the figures indicate the same or equivalent parts, 1 is the temperature detection element, 2 is the temperature setting section, 3 is the first comparison section, and 4 is the second
, 6 is a heater, 7 is a power supply, 8 is a switch, 9 is an arithmetic circuit section, 10 is an upper limit reference setting section, 11 is a lower limit reference setting section, 12 is an upper limit change rate comparison section, 13 is a lower limit change rate 14 is an alarm, 15 is an output controller, 16 is an intermediate temperature setting section, 18 is an AND gate, and 20 is a switch section.

Claims (1)

[Claims] 1. Detects the temperature of the object to be cooled and outputs an on signal when the detected temperature reaches a preset first set value, and outputs an off signal when the detected temperature reaches a second set value. In a temperature control device that controls the operation of an air conditioner and a heater, an arithmetic circuit that calculates a rate of change in detected temperature with respect to time between the two fixed values;
A comparison section that outputs an output when this temperature change rate is larger than a predetermined upper limit temperature change rate or smaller than a separately predetermined lower limit temperature change rate, and a management means that operates based on the output of this comparison section. A temperature control device comprising: 2. The temperature control device according to claim 1, characterized in that the management means is constituted by an alarm. 3. The temperature control device according to claim 1, wherein the management means is constituted by an output controller that changes the output capacity of the air conditioner according to the output of the comparison section.