JP7070246B2 - Electric heating body type discrimination device, electric heating body type discrimination method, and program - Google Patents

Description

The present invention relates to an electric heating body type discriminating device and a method for discriminating the electric heating body type, and more particularly to a heating body type discriminating device for discriminating the electric heating body type used in the electric resistance heater and a method for discriminating the electric heating body type. The present invention also relates to a program for causing a computer to execute such a method for determining an electric heating element.

The fact is that the catalogs and specifications of sheath heaters and cartridge heaters, which are general electric resistance heaters, do not describe the materials and dimensions of the heating wire or the electric tropics themselves that make up the heater.

US 2017/0359857 A1

Therefore, when trying to configure a temperature control system for heating an object by using such an electric resistance heater and a controller that energizes the electric resistance heater, the temperature upper limit specification or the current upper limit of the heating wire or electric tropical Since the specifications are unknown, there is a problem that detailed thermal design cannot be performed. In addition, "heating wire" and "electric tropical" are collectively referred to as "electric heating body".

Therefore, an object of the present invention is to provide an electric heating body type discriminating device capable of discriminating an electric heating body type constituting an electric resistance heater and a method for discriminating the electric heating body type. Further, an object of the present invention is to provide a program for causing a computer to execute such a method for determining an electric heating element.

The present inventor, for example, as described in Patent Document 1 (US 2017/0359857 A1), when the temperature vs. resistance value characteristic of one kind of nickel chromium wire, which is a typical heating wire, is graphed, It increases as the temperature rises from 0 ° C (or normal temperature), reaches a maximum near 400 ° C to 600 ° C, gradually decreases when the temperature rises, reaches a minimum near 800 ° C, and rises again when the temperature rises further. I paid attention to that. In the case of one type of iron-chromium wire and two types of iron-chromium wire, such maximum and minimum are not shown, and each increases monotonically as the temperature rises.

Therefore, in order to solve the above-mentioned problems, the electric heating body type discriminating device of this disclosure is used.
It is an electric heating body type discriminating device that discriminates the electric heating body type constituting the electric resistance heater.
A known resistance ratio based on a resistance value at a predetermined reference temperature and a resistance value at a temperature higher than the above reference temperature is stored as temperature characteristic data for each of a plurality of electric heating element types over a predetermined temperature range. With the memory part
When the electric resistance heater is at the reference temperature, the first resistance measuring unit that measures the resistance value indicated by the electric heater constituting the electric resistance heater as the reference temperature resistance value, and the first resistance measuring unit.
A temperature rise control unit that energizes the electric heater to raise the temperature of the electric resistance heater from the reference temperature to a predetermined end temperature range.
During the temperature rise of the electric resistance heater by the temperature rise control unit, the second resistance measuring unit that measures the resistance value indicated by the electric heater as the resistance value at the time of temperature rise is used.
The electric resistance heater is based on the correspondence between the temperature characteristic data of the known resistance ratio stored in the storage unit and the time-series change indicated by the resistance ratio between the reference temperature resistance value and the resistance value at the time of temperature rise. A body type determination unit that determines the type of electric heating body that constitutes
Equipped with
The above body type determination unit
When the resistance ratio between the reference temperature resistance value and the resistance value at the time of temperature rise shows a maximum or a minimum during the temperature rise of the electric resistance heater, the electric heating element type constituting the electric resistance heater has a temperature-to-resistance characteristic. Is a specific nickel-chromium wire or band having a maximum and a minimum, while the resistance ratio between the reference temperature resistance value and the temperature rise resistance value does not show the maximum or minimum, the electric resistance heater. The first determination unit that determines that the electrothermal body species constituting the above-mentioned specific nickel-chromium wire or a body type other than the band,
After the determination by the first determination unit, the known resistance ratio in the end temperature range stored in the storage unit and the reference temperature resistance value when the electric resistance heater reaches the end temperature range. Includes a second determination unit that further distinguishes and determines the electric heater type by comparing the resistance ratio with the temperature rise resistance value.
It is characterized by that .

In the present specification, the "predetermined reference temperature" is typically normal temperature (for example, 23 ° C., 25 ° C., etc.), but is not limited thereto, and may be, for example, 0 ° C. Further, the "predetermined reference temperature" may be a temperature (known) at which the resistivity of one type of nickel-chromium wire indicates a maximum or a minimum.

Further, the "predetermined temperature range" includes the vicinity of 400 ° C. to 600 ° C. (the resistivity ratio of one nickel-chromium wire indicates the maximum), and the temperature range that can be reached by each electric heating element to be determined. It is desirable to cover it. For example, the "predetermined temperature range" is preferably a temperature range from room temperature to 900 ° C.

Further, the "predetermined end temperature range" means a temperature range at which data acquisition for determining the electric heating body type is completed, and is set as a range of, for example, 800 ° C to 900 ° C.

Further, the "known resistance ratio" is typically calculated as (resistance value at a temperature higher than the reference temperature) / (resistance value at a reference temperature). Similarly, the "resistance ratio" between the reference temperature resistance value and the temperature rise resistance value is typically calculated as (heat temperature resistance value) / (reference temperature resistance value). However, both may be reciprocals.

Further, the "measurement" and "energization" of the resistance value of the electric heating body are typically performed along the longitudinal direction of the heating wire or the electric tropical body forming the electric heating body.
Further, the "specific nickel chromium wire or band having maximum and minimum temperature resistance characteristics" is, for example, one type of nickel chromium wire for electric heating (abbreviation NCHW1) or electric heating specified in the Japanese Industrial Standards (JISC2520). Nickel chrome band for 1 type (abbreviation NCHRW1).

In the electric thermal body type discriminating device of the present disclosure, the storage unit has a known resistance ratio based on the resistance value at a predetermined reference temperature and the resistance value at a temperature higher than the above-mentioned reference temperature for each of the plurality of electric thermal body types. Is stored as temperature characteristic data over a predetermined temperature range. When the electric resistance heater is at the reference temperature, the first resistance measuring unit measures the resistance value indicated by the electric heater constituting the electric resistance heater as the reference temperature resistance value. The temperature rise control unit energizes the electric heater to raise the temperature of the electric resistance heater from the reference temperature to a predetermined end temperature range. During the temperature rise of the electric resistance heater by the temperature rise control unit, the second resistance measuring unit measures the resistance value indicated by the electric heater as the resistance value at the time of temperature rise every moment. The body type determination unit is based on the correspondence between the temperature characteristic data of the known resistance ratio stored in the storage unit and the time-series change indicated by the resistance ratio between the reference temperature resistance value and the resistance value at the time of temperature rise. Then, the type of electric heating body constituting the electric resistance heater is determined. For example, when the temperature of the electric resistance heater is raised with the passage of time by the temperature rise control unit, the temperature characteristic data of the known resistance ratio stored in the storage unit, the reference temperature resistance value, and the rise The time-series change indicated by the resistance ratio with respect to the temperature resistivity value indicates graph shapes corresponding to each other when graphed. Therefore, the type of electric heater constituting the electric resistance heater is determined based on the correspondence between the two.

Further, in this electric heating body type determination device, the first determination unit included in the body type determination unit is a resistance based on the reference temperature resistance value and the temperature rise resistance value during the temperature rise of the electric resistance heater. When the ratio shows maximum or minimum, the electric heating element species constituting the electric resistance heater is determined to be a specific nickel-chromium wire or band having maximum and minimum temperature-to-resistance characteristics, while the reference temperature resistance value. When the resistance ratio between the above and the resistance value at the time of temperature rise does not show the maximum or the minimum, it is determined that the electric heating body type constituting the electric resistance heater is a body type other than the specific nickel chrome wire or band. The reason for this is that the temperature characteristics of the resistance of a particular nickel-chromium wire or band increase as the temperature rises from 0 ° C (or room temperature), reach a maximum near 400 ° C to 600 ° C, and gradually decrease as the temperature rises. This is because it shows a minimum at around 800 ° C. and rises again when the temperature rises further. Therefore, the time-series change in the resistance ratio between the reference temperature resistance value and the temperature rise resistance value indicates the maximum and minimum corresponding to the maximum and minimum of the temperature characteristics. On the other hand, body species other than a specific nickel-chromium wire or band do not show such time-series changes including maximum and minimum. Therefore, the first determination unit can clearly discriminate between the specific nickel chromium wire or band and the body species other than the specific nickel chromium wire or band.

Further, the second determination unit included in the body type determination unit has a known resistance ratio in the end temperature range stored in the storage unit after the determination by the first determination unit, and the electrical resistance. The electric heater type is further distinguished and determined by comparing the resistance ratio between the reference temperature resistance value at the time when the heater reaches the end temperature range and the resistance value at the time of temperature rise. The reason for this is that in the case of a body type other than the above-mentioned specific nickel-chromium wire or band, for example, in the case of one type of iron-chromium wire and two types of iron-chromium wire, each body type (wire type) is unique in the above end temperature range. This is because it shows the resistance ratio. In addition, "1 type of iron chrome wire" and "2 types of iron chrome wire" are 1 type of iron chrome wire for electric heating (abbreviation FCHW1) and 2 types of iron chrome wire for electric heating specified in Japanese Industrial Standards (JISC2520), respectively. Refers to a species (abbreviation FCHW2).

In the electric heating body type discriminating device of one embodiment,
The second resistance measuring unit ends the measurement of the resistance value at the time of raising the temperature when the current energizing current to the electric heating body or the operation amount for energizing the heating element by the temperature raising control unit decreases.
The second determination unit sets the resistance ratio between the reference temperature resistance value at the time when the second resistance measurement unit finishes the measurement and the resistance value at the time of temperature rise to the resistance ratio when the end temperature range is reached. It is characterized in that it is treated as a resistance ratio based on the reference temperature resistance value and the above-mentioned resistance value at the time of temperature rise.

In the electric heating body type discriminating device of this one embodiment, the second resistance measuring unit is at the time of the temperature rise when the energization current or the operation amount for energization of the electric heating body by the temperature rise control unit is reduced. Finish the measurement of resistance value. The reason for this is that it is presumed that the end temperature range has been reached when the energization current to the electric heating body or the operation amount for energization by the temperature rise control unit decreases. Therefore, the second determination unit reaches the end temperature range when the resistance ratio between the reference temperature resistance value and the temperature rise resistance value at the time when the second resistance measurement unit finishes the measurement reaches the end temperature range. It is treated as a resistance ratio based on the above-mentioned reference temperature resistance value and the above-mentioned resistance value at the time of temperature rise. In this case, it is possible to eliminate the need to provide a temperature sensor inside the case of the electric resistance heater itself.

In another aspect, the method for determining the type of electric heater in this disclosure is:
It is an electric heating body type discrimination method for discriminating the electric heating body type constituting the electric resistance heater.
A known resistance ratio based on a resistance value at a predetermined reference temperature and a resistance value at a temperature higher than the above reference temperature is stored as temperature characteristic data for each of a plurality of electric heating element types over a predetermined temperature range. Steps to memorize in the department and
When the electric resistance heater is at the reference temperature, the step of measuring the resistance value indicated by the electric heater constituting the electric resistance heater as the reference temperature resistance value, and
While energizing the electric heating element and raising the temperature of the electric resistance heater from the reference temperature toward a predetermined end temperature range, the resistance indicated by the electric heating element is momentarily increased during the temperature rise of the electric resistance heater. The step of measuring the value as the resistance value at the time of temperature rise, and
The electric resistance heater is configured based on the temperature characteristic data of the known resistance ratio stored in the storage unit and the time-series change indicated by the resistance ratio between the reference temperature resistance value and the resistance value at the time of temperature rise. It has a step to determine the type of electric heating element to be used.
In the step of determining the electric heating body type,
When the resistance ratio between the reference temperature resistance value and the resistance value at the time of temperature rise shows a maximum or a minimum during the temperature rise of the electric resistance heater, the electric heating element type constituting the electric resistance heater has a temperature-to-resistance characteristic. Is a specific nickel-chromium wire or band having a maximum and a minimum, while the resistance ratio between the reference temperature resistance value and the temperature rise resistance value does not show the maximum or minimum, the electric resistance heater. It is determined that the electric heating body type constituting the above is a body type other than the above-mentioned specific nickel-chromium wire or band.
After the above determination, the known resistance ratio in the end temperature range stored in the storage unit, the reference temperature resistance value at the time when the electric resistance heater reaches the end temperature range, and the temperature rise By comparing the resistance ratio with the resistance value, the above-mentioned electric heating element type is further distinguished and judged.
It is characterized by that.

According to the electric heating body type discrimination method of the present disclosure, it is possible to discriminate the electric heating body type constituting the electric resistance heater.

In yet another aspect, the program of this disclosure is a program for causing a computer to execute the above-mentioned electric heating body type determination method.

By having a computer execute the program of this disclosure, the above-mentioned electric heating body type determination method can be carried out.

As is clear from the above, according to the electric heating body type discriminating device and the electric heating body type discriminating method of the present disclosure, it is possible to discriminate the electric heating body type constituting the electric resistance heater. Further, by causing a computer to execute the program of this disclosure, the above-mentioned electric heating body type discrimination method can be carried out.

It is a figure which shows typically the structure of the temperature control system which heats the object to be heated by the electric resistance heater to which the heating wire type discrimination apparatus of one Embodiment of this invention is applied. It is a figure which shows the block structure of the said heating wire type discriminating apparatus. FIG. 3A shows the temperature characteristics of the resistance ratio based on the resistance value at the reference temperature (normal temperature 23 ° C.) and the resistance value at a higher temperature stored in the storage unit of the heating wire type discriminating device. It is a figure which shows the data as a graph. FIG. 3B is a diagram showing the temperature characteristic data of the resistivity in a table format. It is a figure which shows the first half part of the flow of the heating wire type discriminating process executed by the arithmetic unit of the heating wire type discriminating apparatus. It is a figure which shows the latter half part of the flow of the said heating wire type discrimination processing. It is a figure which illustrates the operation amount of the temperature controller from the start of the temperature control in the temperature control system, the temperature of the heating wire constituting the electric resistance heater, and the time-series change of the temperature of the heating object. It is a figure which illustrates the time-series change of the resistance value of the said heater from the start of the temperature rise control in the said temperature control system.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

FIG. 1 schematically shows a configuration of a temperature control system 200 for heating an object to be heated by an electric resistance heater to which a heating wire type discriminating device 10 as an embodiment of the heating body type discriminating device of the present invention is applied. ing. The temperature control system 200 includes an electric resistance heater (hereinafter, simply referred to as “heater”) 20 and a temperature sensor 30 housed or mounted in a housing (indicated by an alternate long and short dash line) of the object 90 to be heated, and the temperature thereof. It is provided with a temperature controller 100 for controlling on / off of the energizing current to the heater 20 based on the output of the sensor 30.

In this example, the heater 20 is a case 20a made of an elongated cylindrical steel pipe forming the outer wall of the heater, and a certain wire type as an example of an electric heating body that is arranged inside the case 20a and generates heat by being energized. It has a heating wire 20x (at first, it is assumed that the wire type is unknown). The heater 20 is connected to the single-phase 200 volt commercial power supply 120 in this example by a pair of wires 121, 122. A solid state relay (SSR) 110 as a switching element is interposed in one of the wirings 121. An ammeter 71 made of a current transformer (CT) is attached to the other wiring 122. Further, a voltmeter 70 made of an instrument transformer (VT) is connected across the wirings 121 and 122 on both sides of the heater 20.

The solid state relay 110 is on / off controlled by the on / off control signal Ctl from the temperature controller 100. In this example, the on / off control signal Ctl is a rectangular wave having a period of 1 to 2 seconds. The duty of the on / off control signal Ctl (that is, the ratio of the on period in one cycle) is set according to the operation amount created by the temperature controller 100 (this is referred to as MV). Thereby, during the on period of the solid state relay 110, the heater 20 is energized by the commercial power supply 120 (synonymous with the energization of the heating wire 20x; the same applies throughout the present specification).

In this example, the temperature controller 100 is a commercially available product (for example, a temperature controller (digital controller) Thermac series E5GC manufactured by OMRON Corporation) and performs PID control (Proportional, Integral and Differential Control). During the control operation, the temperature controller 100 inputs the temperature of the object to be heated 90 (this is represented by the same code TO as the temperature signal) by the output of the temperature sensor 30 (temperature signal TO) every moment, and the temperature controller 100 inputs the temperature of the object to be heated 90. An operation amount MV (unit%) according to PID control is created and set so that the temperature TO becomes a predetermined target temperature (this is referred to as Ttarget). The on / off control signal Ctl corresponding to the operation amount MV is output to the solid state relay 110, and the solid state relay 110 is on / off controlled as described above, whereby the heater 20 is energized.

For example, as shown in FIG. 5, when the target temperature Ttarget = 200 ° C. is set, the operation amount MV of the temperature controller 100 rises to 100% in a stepwise manner within 2 to 3 seconds from the start of temperature control. There is. In response to this, the temperature TH of the heater 20 rises rapidly in proportion to time for several seconds from the start of temperature control, and then gradually slows down. In this example, 800 after about 13 seconds from the start of temperature control. It has reached ℃. Approximately 30 seconds after the start of temperature control, when the temperature TH of the heater 20 approaches 200 ° C., the operation amount MV is reduced (in the example of FIG. 5 this example, heating is stopped about 38 seconds after the start of temperature control. There.). The temperature TH of the heater 20 in FIG. 5 is measured by providing a special temperature sensor inside the case 20a of the heater 20 (in the example of FIG. 1, the temperature inside the case 20a of the heater 20). No sensor is provided.)

The ammeter 71 shown in FIG. 1 detects the current value I of the energizing current to the heater 20. The voltmeter 70 detects the voltage value V of the voltage applied to the heater 20. The current value I detected by the ammeter 71 and the voltage value V detected by the voltmeter 70 are input to the heating wire type discriminating device 10.

As shown in FIG. 2, in this example, the heating wire type discriminating device 10 includes a calculation unit 11, a display unit 12, an operation unit 13, a storage unit 14, a data input unit 15, and a communication unit 16. I have.

The calculation unit 11 includes a CPU (central processing unit) operated by software (computer program), and executes processing according to a heating wire type determination method described later and various other processing.

In this example, the display 12 is composed of an LCD (liquid crystal display element), and displays an image on the display screen according to a control signal from the calculation unit 11. In this example, the display 12 is used to display the determination result of the heating wire type.

In this example, the operation unit 13 includes a keyboard and a mouse, and is used for inputting instructions and data from a user (operator).

In this example, the storage unit 14 has an EEPROM (electrically rewritable non-volatile memory) capable of storing data non-temporarily and a RAM (random access memory) capable of temporarily storing data. Includes. Software (computer program) for controlling the arithmetic unit 11 is stored in the storage unit 14. Further, in this example, the storage unit 14 has a resistance value at a predetermined reference temperature and a temperature higher than the reference temperature for each of the plurality of heating wire types that may constitute the heater 20. The known resistance ratio based on the resistance value of is stored as temperature characteristic data. Further, the storage unit 14 stores the resistance ratios obtained by actually measuring the heater 20 before, during, and after the temperature rise. These stored contents will be described in detail later.

The data input unit 15 includes an AD (analog to digital) converter in this example. The data input unit 15 receives a signal representing the current value I from the ammeter 71 and the voltage value V from the voltmeter 70, performs AD conversion, and inputs the signal to the calculation unit 11.

The communication unit 16 is controlled by the calculation unit 11 to transmit predetermined information to an external device, or receives information from the external device and passes it to the calculation unit 11. In this example, the communication unit 16 transmits an instruction (command signal CM) from the calculation unit 11 to the temperature controller 100.

4A to 4B show a processing flow of a heating wire type discriminating method as an example of a heating element type discriminating method executed by the heating wire type discriminating device 10 in order to discriminate the heating wire type constituting the heater 20. There is. Immediately before the start of this processing flow, the heater 20 is assumed to be at a predetermined reference temperature, in this example, a room temperature of 23 ° C.

First, as shown in step S1 of FIG. 4A, the calculation unit 11 may configure the heater 20 from the outside via, for example, the communication unit 16 in response to an instruction through the operation unit 13 of the user. For each of a plurality of heating wire types, a known resistance ratio between a predetermined resistance value at a reference temperature of 23 ° C. and a resistance value at a temperature higher than the reference temperature of 23 ° C. is read as temperature characteristic data. The calculation unit 11 stores the read temperature characteristic data in the storage unit 14. The storage unit 14 retains this temperature characteristic data at least until the end of this processing flow.

In this example, as shown in the table of FIG. 3B, the temperature characteristic data is about "nickel chromium wire 1 type", "iron chromium wire 1 type", and "iron chromium wire 2 types" as the heating wire type. Each has a known resistance ratio over a temperature range of 100 ° C to 900 ° C when the reference temperature is 23 ° C, that is, (resistance value at a temperature higher than the reference temperature) / (resistance value at a reference temperature). ) Is included. "Type 1 nickel-chromium wire" is an example of a specific nickel-chromium wire having maximum and minimum temperature resistance characteristics. That is, as can be seen from the graph C1 in FIG. 3A, the resistivity ratio of "nickel chromium wire type 1" increases as the temperature rises from room temperature 23 ° C., and shows a maximum P1 in the vicinity of 400 ° C. to 600 ° C. When the temperature rises further, it gradually decreases and shows a minimum P2 near 800 ° C., and when the temperature rises further, it rises again. "Iron chromium wire type 1" and "iron chromium wire type 2" are examples of wire types other than the above-mentioned specific nickel chromium wire. That is, as can be seen from the graph C2 in FIG. 3A, the resistivity ratio of "Iron Chromium Wire Type 1" does not show such a maximum or minimum, and increases monotonically as the temperature rises. Similarly, as can be seen from the graph C3 in FIG. 3 (A), the resistivity ratio of the "two types of iron chromium wire" does not show such a maximum or a minimum, and increases monotonically as the temperature rises. However, the increase in the resistivity of "Iron Chromium Wire Type 1" is larger than the increase in the resistance ratio of "Iron Chromium Wire Type 1", which is particularly remarkable at high temperatures such as 800 ° C. to 900 ° C. .. As will be described later, these temperature characteristic data are used as materials for discriminating the heating wire type of the heater 20. If the temperature characteristic data is stored in the storage unit 14 in advance, this step S1 may be omitted.

Next, as shown in step S2 of FIG. 4A, in response to an instruction through the operation unit 13 of the user, the calculation unit 11 has a line type other than "nickel chromium wire type 1", in this example, "iron chromium". The lower limit of the resistance ratio in the end temperature range (including the temperature of the heater 20 at the end of the temperature rise control described later) for "1 type of wire" (abbreviated as FCHW1) and "2 types of iron chromium wire" (abbreviated as FCHW2). And set the upper limit.

In this example, based on the findings of FIG. 5, the end temperature range is assumed to be in the range of 800 ° C to 900 ° C. Therefore, based on the data of the resistivity of the portion corresponding to the end temperature range of 800 ° C. to 900 ° C. in the table of FIG. 3 (B), as shown in Table 1 below, the heating wire types are "iron chromium wire". The lower limit and the upper limit of the resistance ratio for being identified as "1st class" (abbreviated as FCHW1) and "2nd class of iron chromium wire" (abbreviated as FCHW2) are set. In this example, the lower limit and the upper limit of the resistance ratio in Table 1 correspond to the resistance ratio at 800 ° C. and the resistance ratio at 900 ° C. in the table of FIG. 3B, respectively.
(Table 1)

Next, as shown in step S3 of FIG. 4A, the calculation unit 11 acts as a first resistance measurement unit in response to an instruction through the operation unit 13 of the user, and the resistance indicated by the heating wire 20x constituting the heater 20. The value is measured as a reference temperature resistance value (this is referred to as R0). Specifically, the arithmetic unit 11 transmits a command signal CM via the communication unit 16 to cause the temperature controller 100 to energize the heating wire 20x in milliseconds (the temperature rise is negligible). .. Further, the arithmetic unit 11 inputs the current value from the ammeter 71 (this is referred to as I0) and the voltage value from the voltmeter 70 (this is referred to as V0) due to the energization via the data input unit 15. And enter. Then, the reference temperature resistance value R0 is set to R0 = V0 / I0 ... (Eq.1).
Asked by.

Next, as shown in step S4 of FIG. 4A, the calculation unit 11 sends a command signal CM to the temperature controller 100 to operate the temperature controller 100 as a temperature rise control unit. In this example, the temperature controller 100 starts the temperature rise control of the heating object 90 under the setting condition of the target temperature Ttarget = 200 ° C. of the heating object 90. Then, as shown in FIG. 5, the heater 20 is heated from the reference temperature of 23 ° C. to the end temperature range of 800 ° C. to 900 ° C. The temperature distribution inside the case 20a of the heater 20 is ignored.

Next, as shown in steps S5 to S8 of FIG. 4A, the arithmetic unit 11 acts as a second resistance measuring unit, and the resistance value indicated by the heating wire 20x constituting the heater 20 is momentarily while the temperature of the heater 20 is rising. Is measured as a temperature rise resistance value (this is referred to as Ri), and a resistance ratio (this is referred to as Rr) based on the reference temperature resistance value R0 and the temperature rise resistance value Ri is calculated. Specifically, in this example, the current value Ii from the ammeter 71 is input in step S5, and the current value Ii in this turn does not decrease with respect to the current value Ip in the previous turn in step S6. Judge whether or not. If the current value Ii in this turn does not decrease with respect to the current value Ip in the previous turn (NO in step S6), it is determined that the temperature is rising, and the process proceeds to step S7 to proceed to the voltmeter 70. Enter the voltage value Vi from. As a result, in step S8, the resistance value at the time of temperature rise Ri = Vi / Ii in this turn is obtained. Further, the resistance ratio Rr based on the reference temperature resistance value R0 and the temperature rise resistance value Ri is Rr = Ri / R0 ... (Eq.2).
Asked by. In this way, the calculation unit 11 obtains the resistance ratio Rr every moment while the temperature of the heater 20 is rising. The resistivity ratio Rr obtained every moment is stored in the storage unit 14 in chronological order.

In step S6 of FIG. 4A, if the current value Ir in this turn is smaller than the current value Ip in the previous turn (YES in step S6), the calculation unit 11 raises the temperature by the temperature controller 100. It is determined that the control is completed, that is, the heater 20 has reached the end temperature range (range of 800 ° C. to 900 ° C.) based on the findings of FIG. 5, and the measurement of the resistance value Ri at the time of temperature rise is finished at this point. do. As shown in step S9, the arithmetic unit 11 obtains the resistance ratio Rr at this point as the resistance ratio at the end (this is referred to as RrE). The obtained resistivity ratio RrE is stored in the storage unit 14.

Next, in step S11 of FIG. 4B, the arithmetic unit 11 acts as a line type determination unit, particularly as a first determination unit, and refers to the time-series change of the resistance ratio Rr stored in the storage unit 14, and refers to the resistance ratio. It is determined whether Rr shows a maximum or a minimum peak. Here, when the resistance ratio Rr shows a peak of maximum or minimum (YES in step S11), it is determined that the heating wire type constituting the heater 20 is "nickel chromium wire 1 type" (step S12). On the other hand, when the resistance ratio Rr does not show a peak of maximum or minimum (NO in step S11), it is determined that the heating wire type constituting the heater 20 is a wire type other than "nickel chromium wire 1 type".

The reason for making such a determination is firstly, when the temperature of the heater 20 is raised with the passage of time, the temperature characteristic data of the known resistance ratio stored in the storage unit 14 and the reference temperature resistance value R0. This is because the time-series change indicated by the resistance ratio Rr with respect to the resistance value Ri at the time of temperature rise indicates graph shapes corresponding to each other when graphed. Therefore, it can be said that the heating wire type constituting the heater 20 can be determined based on the correspondence between the two.

Second, for example, as shown in the graph of FIG. 3A, the temperature characteristic of the resistance ratio Rr (same for the resistance value) of "nickel chromium wire type 1" rises from 0 ° C. (or normal temperature). This is because it increases with increasing temperature, shows a maximum P1 in the vicinity of 400 ° C. to 600 ° C., gradually decreases when the temperature rises, shows a minimum P2 in the vicinity of 800 ° C., and rises again when the temperature rises further. For example, FIG. 6 shows the time-series change of the resistance value Ri of the heating wire 20x from the start of the temperature rise control when the heating wire 20x constituting the heater 20 is known to be “a kind of nickel chromium wire”. It is illustrated as a graph. The time-series change of the resistance value Ri shows the maximum Q1 and the minimum Q2 corresponding to the maximum P1 and the minimum P2 in the graph of FIG. 3 (A). On the other hand, line types other than "nickel-chromium wire type 1" do not show such time-series changes including maximum and minimum. Therefore, the calculation unit 11 can clearly distinguish between the “nickel chrome wire type 1” and the line type other than the “nickel chrome wire type 1”.

Next, in steps S13 to S16 of FIG. 4B, the arithmetic unit 11 acts as a line type determination unit, particularly a second determination unit, and has a known resistance ratio (that is, a known resistance ratio) in the end temperature range stored in the storage unit 14. The lower limit and upper limit of the resistance ratio shown in Table 1 are compared with the resistance ratio RrE at the end time (estimated to be the time when the heater 20 reaches the end temperature range) obtained in step S9 of FIG. 4A. , The line type other than "Nickel chrome wire type 1" is further distinguished and judged. Specifically, first, if the resistivity ratio RrE at the end is within the range between the lower limit of 1.098 and the upper limit of 1.101 for "iron chromium wire type 1" (FCHW1) (YES in step S13). , It is determined that the heating wire type constituting the heater 20 is "iron chromium wire 1 type" (step S14). Next, if the resistivity ratio RrE at the end is within the range between the lower limit of 1.170 and the upper limit of 1.180 for "2 types of iron chromium wire" (FCHW2) (YES in step S15), the heater 20 is turned on. It is determined that the constituent heating wire types are "two types of iron chromium wires" (step S16).

The reason for this determination is that in the case of wire types other than "nickel chromium wire type 1", in this example, "iron chromium wire type 1" and "iron chromium wire type 2" are in the end temperature range, respectively. This is because it shows the resistance ratio peculiar to the line type. For example, if the resistance ratio RrE = 1.100 at the end, it can be determined that the heating wire type constituting the heater 20 is "iron chromium wire 1 type". Further, if the resistance ratio RrE = 1.175 at the end, it can be determined that the heating wire type constituting the heater 20 is "2 types of iron chromium wire".

The resistance ratio RrE at the end is not within the range between the lower limit and the upper limit for "iron chromium wire type 1" (FCHW1) (NO in step S13), and for "iron chromium wire type 2" (FCHW2). If it is not within the range between the lower limit and the upper limit of (NO in step S15), the arithmetic unit 11 indicates that the heating wire type constituting the heater 20 is another material, that is, "nickel chromium wire 1 type". , It is determined that the material is other than "Iron Chromium Wire Type 1" and "Iron Chromium Wire Type 2" (step S17).

In this way, according to the processing flow of FIGS. 4A to 4B, the heating wire type constituting the heater 20 can be discriminated. The determination result of the heating wire type is displayed on the display screen of the display 12. Thereby, the user can know the heating wire type constituting the heater 20.

Further, in the above example, when the energization current (current value Ir) decreases in step S6 of FIG. 4A (YES in step S6), the measurement of the resistance value at the time of temperature rise is completed, and the resistance ratio RrE at the end is calculated. , It is treated as the resistance ratio when the end temperature range is reached. In this case, it is possible to eliminate the need to provide a temperature sensor inside the case 20a of the heater 20 itself.

The timing at which the measurement of the resistance value at the time of temperature rise is finished is not limited to the time when the energizing current decreases. For example, the calculation unit 11 is configured to input information representing the operation amount MV from the temperature controller 100 via the communication unit 16, and after starting the temperature rise control in step S4 of FIG. 4A, the operation amount MV decreases. Occasionally, the measurement of the resistance value at the time of temperature rise may be completed. Also in this case, based on the findings of FIG. 5, the resistivity ratio RrE at the end can be treated as the resistance ratio at the time when the end temperature range is reached. This eliminates the need to provide a temperature sensor inside the case 20a of the heater 20 itself.

The above-mentioned heating wire type determination method is used as software (computer program) on a recording medium that can store data non-transitory such as a CD (compact disc), DVD (digital universal disc), and flash memory. You may record it. By installing the software recorded on such a recording medium on a substantial computer device such as a personal computer, a PDA (Personal Digital Assistance), or a smartphone, the above-mentioned heating wire type determination can be performed on those computer devices. The method can be executed.

Further, in the above-described embodiment, an example in which the heating wire type discriminating device 10 provided separately from the temperature controller 100 uses the temperature controller 100 as the temperature rise control unit to discriminate the heating wire type has been described. However, it is not limited to this. The software related to the above-mentioned heating wire type discrimination method may be incorporated in the temperature controller 100, and the above-mentioned heating wire type discrimination method may be executed as one of the operation modes (heating wire type discrimination mode) of the temperature controller 100.

Further, in the above-described embodiment, the plurality of heating wire types that may constitute the heater 20 are 3 types of "nickel chromium wire 1 type", "iron chromium wire 1 type", and "iron chromium wire 2 types". The case of determining the type has been described, but the present invention is not limited to this. For example, in the storage unit 14, a known resistance ratio based on a resistance value at a predetermined reference temperature and a resistance value at a temperature higher than the reference temperature is predetermined for each of four or more types of heating wires. It may be stored as temperature characteristic data over a certain temperature range, whereby four or more types of heating wire types may be discriminated.

In particular, in the above-described embodiment, as an example of a specific nickel chromium wire having maximum and minimum temperature resistance characteristics, only "one kind of nickel chromium wire" is mentioned, but the present invention is not limited thereto. As an example of the above-mentioned specific nickel chromium wire, a nickel chromium wire other than "Nickel chromium wire type 1" may be included. In the processing flow of the above-mentioned heating wire type discrimination method (FIGS. 4A to 4B), when the resistance ratio Rr shows a peak of maximum or minimum (YES in step S11 of FIG. 4B), the heating wire constituting the heater 20 is formed. It was immediately determined that the seed was "one kind of nickel-chromium wire" (step S12 in FIG. 4B), but in that case, the following processing is performed instead.

That is, for the specific nickel chromium wire (including a plurality of types), the known resistance ratios (lower limit and upper limit of the resistance ratio) in the end temperature range are added and stored in Table 1 of the storage unit 14 in advance. Keep it. When the resistivity ratio Rr shows a peak of maximum or minimum (YES in step S11 of FIG. 4B), the arithmetic unit 11 acts as a line type determination unit, particularly as a first determination unit, and constitutes a heater 20. First determines that it is a "specific nickel chromium wire (including a plurality of types)". Subsequently, the arithmetic unit 11 functions as a line type determination unit, particularly a second determination unit, and has a known resistance ratio (lower limit and upper limit of the resistance ratio) in the end temperature range stored in the storage unit 14, and FIG. 4A. Compared with the resistivity ratio RrE at the end time (estimated to be the time when the heater 20 reaches the end temperature range) obtained in step S9 of the above, the above-mentioned specific nickel chromium wires (including a plurality of types) ”are mutually. Judge separately. As a result, even when nickel chromium wires other than "nickel chromium wire type 1" are included as the specific nickel chromium wires, they can be distinguished from each other for determination.

In the above-described embodiment, the heating element constituting the heater 20 is a heating wire 20x, but the present invention is not limited to this. The heating element constituting the heater 20 may be a heating wire and / or an electric tropical body. Thereby, the concepts of the heating wire type discriminating device and the heating wire type discriminating method can be extended to the heating body type discriminating device and the heating body type discriminating method, respectively.

The above embodiment is an example, and various modifications can be made without departing from the scope of the present invention. The plurality of embodiments described above can be established independently, but combinations of the embodiments are also possible. Further, although various features in different embodiments can be established independently, it is also possible to combine features in different embodiments.

10 Heating wire type discriminator 11 Calculation unit 14 Storage unit 20 Heater 70 Voltmeter 71 Ammeter 100 Temperature controller

Claims (4)

It is an electric heating body type discriminating device that discriminates the electric heating body type constituting the electric resistance heater.
A known resistance ratio based on a resistance value at a predetermined reference temperature and a resistance value at a temperature higher than the above reference temperature is stored as temperature characteristic data for each of a plurality of electric heating element types over a predetermined temperature range. With the memory part
When the electric resistance heater is at the reference temperature, the first resistance measuring unit that measures the resistance value indicated by the electric heater constituting the electric resistance heater as the reference temperature resistance value, and the first resistance measuring unit.
A temperature rise control unit that energizes the electric heater to raise the temperature of the electric resistance heater from the reference temperature to a predetermined end temperature range.
During the temperature rise of the electric resistance heater by the temperature rise control unit, the second resistance measuring unit that measures the resistance value indicated by the electric heater as the resistance value at the time of temperature rise is used.
The electric resistance heater is based on the correspondence between the temperature characteristic data of the known resistance ratio stored in the storage unit and the time-series change indicated by the resistance ratio between the reference temperature resistance value and the resistance value at the time of temperature rise. A body type determination unit that determines the type of electric heating body that constitutes
Equipped with
The above body type determination unit
When the resistance ratio between the reference temperature resistance value and the resistance value at the time of temperature rise shows a maximum or a minimum during the temperature rise of the electric resistance heater, the electric heating element type constituting the electric resistance heater has a temperature-to-resistance characteristic. Is a specific nickel-chromium wire or band having a maximum and a minimum, while the resistance ratio between the reference temperature resistance value and the temperature rise resistance value does not show the maximum or minimum, the electric resistance heater. The first determination unit that determines that the electrothermal body species constituting the above-mentioned specific nickel-chromium wire or a body type other than the band,
After the determination by the first determination unit, the known resistance ratio in the end temperature range stored in the storage unit and the reference temperature resistance value when the electric resistance heater reaches the end temperature range. Includes a second determination unit that further distinguishes and determines the electric heater type by comparing the resistance ratio with the temperature rise resistance value.
An electric heating body type discriminating device characterized by this . In the electric heating body type discriminating device according to claim 1 ,
The second resistance measuring unit ends the measurement of the resistance value at the time of raising the temperature when the current energizing current to the electric heating body or the operation amount for energizing the heating element by the temperature raising control unit decreases.
The second determination unit sets the resistance ratio between the reference temperature resistance value at the time when the second resistance measurement unit finishes the measurement and the resistance value at the time of temperature rise to the resistance ratio when the end temperature range is reached. An electrothermal body type discriminating device characterized in that it is treated as a resistance ratio based on a reference temperature resistance value and the above-mentioned resistance value at the time of temperature rise. It is an electric heating body type discrimination method for discriminating the electric heating body type constituting the electric resistance heater.
A known resistance ratio based on a resistance value at a predetermined reference temperature and a resistance value at a temperature higher than the above reference temperature is stored as temperature characteristic data for each of a plurality of electric heating element types over a predetermined temperature range. Steps to memorize in the department and
When the electric resistance heater is at the reference temperature, the step of measuring the resistance value indicated by the electric heater constituting the electric resistance heater as the reference temperature resistance value, and
While energizing the electric heating element and raising the temperature of the electric resistance heater from the reference temperature toward a predetermined end temperature range, the resistance indicated by the electric heating element is momentarily increased during the temperature rise of the electric resistance heater. The step of measuring the value as the resistance value at the time of temperature rise, and
The electric resistance heater is configured based on the temperature characteristic data of the known resistance ratio stored in the storage unit and the time-series change indicated by the resistance ratio between the reference temperature resistance value and the resistance value at the time of temperature rise. It has a step to determine the type of electric heating element to be used.
In the step of determining the electric heating body type,
When the resistance ratio between the reference temperature resistance value and the resistance value at the time of temperature rise shows a maximum or a minimum during the temperature rise of the electric resistance heater, the electric heating element type constituting the electric resistance heater has a temperature-to-resistance characteristic. Is a specific nickel-chromium wire or band having a maximum and a minimum, while the resistance ratio between the reference temperature resistance value and the temperature rise resistance value does not show the maximum or minimum, the electric resistance heater. It is determined that the electric heating body type constituting the above is a body type other than the above-mentioned specific nickel-chromium wire or band.
After the above determination, the known resistance ratio in the end temperature range stored in the storage unit, the reference temperature resistance value at the time when the electric resistance heater reaches the end temperature range, and the temperature rise By comparing the resistance ratio with the resistance value, the above-mentioned electric heating element type is further distinguished and judged.
A method for discriminating an electric heating body, which is characterized in that. A program for causing a computer to execute the method for determining an electric heating element according to claim 3 .

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