JPH0110643Y2 - - Google Patents
Info
- Publication number
- JPH0110643Y2 JPH0110643Y2 JP972882U JP972882U JPH0110643Y2 JP H0110643 Y2 JPH0110643 Y2 JP H0110643Y2 JP 972882 U JP972882 U JP 972882U JP 972882 U JP972882 U JP 972882U JP H0110643 Y2 JPH0110643 Y2 JP H0110643Y2
- Authority
- JP
- Japan
- Prior art keywords
- temperature
- constant temperature
- heater
- thermocouple
- control circuit
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
- 238000010438 heat treatment Methods 0.000 claims description 2
- 238000001514 detection method Methods 0.000 description 16
- 239000004020 conductor Substances 0.000 description 6
- 238000010586 diagram Methods 0.000 description 6
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 2
- 238000009434 installation Methods 0.000 description 1
- WABPQHHGFIMREM-UHFFFAOYSA-N lead(0) Chemical compound [Pb] WABPQHHGFIMREM-UHFFFAOYSA-N 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Landscapes
- Thermally Actuated Switches (AREA)
- Control Of Temperature (AREA)
Description
【考案の詳細な説明】
本考案は、温度検出端として熱電対を有する恒
温槽に関する。[Detailed Description of the Invention] The present invention relates to a constant temperature oven having a thermocouple as a temperature detection end.
第１図はこのような恒温槽の第１の従来例を示
す構成説明図であり、図中、１は第１の恒温槽、
２は該恒温槽１内の所定部分に埋設され該恒温槽
１の内部を加熱するヒータ、３は恒温槽１内の所
定部分に装着され該恒温槽内の温度を検出する熱
電対、４は冷接点補償回路を内蔵すると共に熱電
対３からの検出信号を受けあらかじめ設定された
設定温度に対応させてヒータ２へ供給されるヒー
ト電流を制御する温調用の制御回路、５a，５bは
熱電対３からの検出信号を制御回路４へ伝送する
補償導線、６a，６bは制御回路４で制御される上
記ヒート電流をヒータ２へ供給するヒータ線であ
る。第１図において、第１恒温槽１内の温度が熱
電対３によつて検出されると、該検出信号が補償
導線５a，５b内を伝送されて制御回路４へ至る。
該制御回路４において、あらかじめ設定されてい
る設定温度の信号と上記検出信号が比較演算さ
れ、該設定温度に対応するヒート電流が算出され
る。該ヒート電流はヒータ線６a，６bを経由して
ヒータ２へ供給され、第１恒温槽１の内部を加熱
するようになつている。 FIG. 1 is a configuration explanatory diagram showing a first conventional example of such a thermostatic chamber, and in the figure, 1 indicates a first thermostatic chamber;
2 is a heater that is embedded in a predetermined part of the thermostatic oven 1 and heats the inside of the thermostatic oven 1; 3 is a thermocouple that is attached to a predetermined part of the thermostatic oven 1 to detect the temperature inside the thermostatic oven; 4 is a heater that is embedded in a predetermined part of the thermostatic oven 1; Temperature control control circuits 5 a and 5 b include a built-in cold junction compensation circuit and control the heat current supplied to the heater 2 in response to a detection signal from the thermocouple 3 in accordance with a preset temperature . Compensating lead wires 6 a and 6 b that transmit the detection signal from the thermocouple 3 to the control circuit 4 are heater wires that supply the heat current controlled by the control circuit 4 to the heater 2 . In FIG. 1, when the temperature in the first constant temperature oven 1 is detected by the thermocouple 3, the detection signal is transmitted through the compensation conductors 5 a and 5 b and reaches the control circuit 4 .
In the control circuit 4, a preset temperature signal and the detection signal are compared and calculated, and a heat current corresponding to the set temperature is calculated. The heat current is supplied to the heater 2 via heater wires 6 a and 6 b to heat the inside of the first constant temperature oven 1 .
然し乍ら、第１図に示すような恒温槽でなる上
記第１従来例の場合には、補償導線５a，５bに類
似した熱電対用補償導線が多種類市販されている
ため、ユーザなどで設置工事等を行なうに際し、
正しい補償導線５a，５bを入手し難いとか誤つた
熱電対用補償導線を配線してトラブルを発生し易
い等という欠点があつた。 However , in the case of the above-mentioned first conventional example consisting of a thermostatic oven as shown in FIG . When performing installation work, etc.,
The disadvantages include that it is difficult to obtain the correct compensation lead wires 5a and 5b , and troubles can easily occur due to wiring of the wrong thermocouple compensation lead wires.
また、第２図は上述のような第１従来例の欠点
に鑑みて本考案者らが考案して製品化した第２の
従来例を示す構成説明図であり、図中、第１図と
同一記号は同一意味をもたせて使用しここでの重
複説明は省略する。尚、７は冷接点補償用ダイオ
ード、８は該ダイオード７を内部に収納し該内部
を周囲温度よりも高い所定の温度（例えば80℃）
に保つ第２の恒温槽、９a，９bは熱電対３からの
検出信号を制御回路４へ伝送する例えば銅線でな
る信号線、９c，９dは冷接点補償用ダイオード７
と制御回路４を結ぶ例えば銅線でなる信号線であ
る。尚、冷接点補償用ダイオード７は、ダイオー
ドに流れる電流が温度の関数となつていることを
利用し第２恒温槽８内の温度を検出する温度検出
端として使用される。また、第２恒温槽８内を加
熱するには、通常、図示しないヒータが第２恒温
槽８内に設けられると共に該ヒータにヒート電流
を送るヒータ線（図示せず）も設けられるが、例
外的に冷接点補償用ダイオード７自体に温度検出
機能とヒータ機能を併有させても良いものとす
る。このような構成からなる第２図において、第
２恒温槽８内は例えば80℃の一定温度に保たれて
おり、第１恒温槽１内の温度が熱電対３によつて
検出されると、該検出信号が信号線９a，９b内を
伝送されて制御回路４へ至る。また、冷接点補償
用ダイオード７からの信号が信号線９c，９dを介
して制御回路４内の冷接点補償回路に供給されて
いる。更に、制御回路４において、あらかじめ設
定されている設定温度の信号と上記検出信号が比
較演算され、該設定温度に対応するヒート電流が
算出される。該ヒート電流は、ヒータ線６a，６b
を経由してヒータ２へ供給され、第１恒温槽１の
内部を加熱するようになつている。 In addition, FIG. 2 is a configuration explanatory diagram showing a second conventional example devised and commercialized by the present inventors in view of the drawbacks of the first conventional example as described above. Identical symbols are used with the same meaning, and repeated explanation here will be omitted. Note that 7 is a cold junction compensation diode, and 8 is a diode that houses the diode 7 inside and maintains the inside at a predetermined temperature higher than the ambient temperature (for example, 80°C).
9a and 9b are signal lines made of copper wire, for example, for transmitting the detection signal from the thermocouple 3 to the control circuit 4; 9c and 9d are cold junction compensation diodes 7;
This is a signal line made of, for example, a copper wire that connects the control circuit 4 and the control circuit 4. Note that the cold junction compensation diode 7 is used as a temperature detection end for detecting the temperature inside the second constant temperature oven 8 by utilizing the fact that the current flowing through the diode is a function of temperature. Further, in order to heat the inside of the second thermostatic oven 8, a heater (not shown) is usually provided in the second thermostatic oven 8, and a heater wire (not shown) that sends a heating current to the heater is also provided, but there are exceptions. Alternatively, the cold junction compensation diode 7 itself may have both a temperature detection function and a heater function. In FIG. 2 having such a configuration, the inside of the second constant temperature bath 8 is maintained at a constant temperature of, for example, 80° C., and when the temperature inside the first constant temperature bath 1 is detected by the thermocouple 3, The detection signal is transmitted through the signal lines 9 a and 9 b and reaches the control circuit 4 . Further, a signal from the cold junction compensation diode 7 is supplied to the cold junction compensation circuit in the control circuit 4 via signal lines 9 c and 9 d . Further, in the control circuit 4, a preset temperature signal and the detection signal are compared and calculated, and a heat current corresponding to the set temperature is calculated. The heat current is applied to the heater wires 6 a and 6 b
The water is supplied to the heater 2 via the heater 2 to heat the inside of the first constant temperature oven 1.
然し乍ら、第２図で示すような恒温槽でなる上
記第２従来例の場合には、信号線９a，５dが４本
になつているため、前記第１従来例の場合に比し
配線作業が面倒になる等の欠点があつた。 However , in the case of the above - mentioned second conventional example which consists of a constant temperature oven as shown in FIG. There were drawbacks such as making the work cumbersome.
本考案は、かかる第１および第２の従来例にみ
られる上述の欠点に鑑みてなされたものであり、
その目的は、熱電対用補償導線として特殊なもの
を用いず且つその使用本数も少ないような恒温槽
を提供することにある。 The present invention has been made in view of the above-mentioned drawbacks found in the first and second conventional examples,
The purpose is to provide a thermostatic chamber that does not use special compensating conductors for thermocouples and uses only a small number of them.
本考案の特徴は、温度検出端として熱電対を有
する恒温槽において、所望の温度に温度制御され
る第１の恒温槽の近くに、周囲温度よりも高い所
定温度に保たれて上記熱電対の冷接点となる第２
の恒温槽を分離して設け、該第２恒温槽内を上記
所定温度に保つ電気ヒータとして正特性サーミス
タを用いたことにある。 The feature of the present invention is that in a constant temperature bath having a thermocouple as a temperature detection end, the thermocouple is placed near the first constant temperature bath whose temperature is controlled to a desired temperature, and the thermocouple is kept at a predetermined temperature higher than the ambient temperature. The second cold junction
A thermostatic chamber is provided separately, and a positive temperature coefficient thermistor is used as an electric heater for maintaining the inside of the second thermostatic chamber at the predetermined temperature.
以下、本考案について図を用いて詳細に説明す
る。第３図は本考案実施例の構成説明図であり、
図中、第２図と同一記号は同一意味をもたせて使
用しここでの説明は省略する。また、１０は正特
性サーミスタ（PTCサーミスタ）、４′は冷接点
補償回路が内蔵されておらず熱電対３からの検出
信号を受けると、あらかじめ設定された設定温度
に対応させてヒータ２へ供給されるヒート電流を
制御する温調用の制御回路である。尚、正特性サ
ーミスタ１０の電源としては、ヒータ線６a，６b
から並列にヒータ電源が取り出されている。 Hereinafter, the present invention will be explained in detail using figures. FIG. 3 is an explanatory diagram of the configuration of the embodiment of the present invention,
In the figure, the same symbols as in FIG. 2 are used with the same meaning, and the explanation here will be omitted. In addition, 10 is a positive characteristic thermistor (PTC thermistor), and 4' does not have a built-in cold junction compensation circuit, and when it receives a detection signal from thermocouple 3, it supplies it to heater 2 in accordance with the preset temperature. This is a temperature control control circuit that controls the heat current generated. In addition, as a power source for the positive temperature coefficient thermistor 10, heater wires 6 a and 6 b are used.
Heater power is taken out in parallel from.
以下、本考案実施例の動作について説明する。
第３図において、第１恒温槽１内の温度が熱電対
３によつて検出されると、該検出信号が信号線９
ａ，９b内を伝送されて制御回路４へ至る。一方、
正特性サーミスタ１０はある温度（例えば80℃）
を境として抵抗値が正の方向に大きく変化するも
のであり、この温度に至るまで制御回路４からヒ
ータ線６ａ，６ｂを介して送出されたヒータ電流
が正特性サーミスタ１０に供給されて第２恒温槽
８内を加熱する。また、第２恒温槽８内の温度が
上記温度（例えば80℃）になると正特性サーミス
タ１０の抵抗値が正の方向に大きく変化するた
め、この温度（例えば80℃）を境として制御回路
４からヒータ線６ａ，６ｂを介して送出されたヒ
ータ電流がヒータ２に供給されて第１恒温槽１内
を加熱するようになる。このような正特性サーミ
スタ１０の働きによつて第２恒温槽８内が上記温
度（例えば80℃）に保たれ、熱電対３のターミナ
ル部分が一定温度（例えば80℃）に保持されるよ
うになる。また、該ターミナル部分が一定温度に
保持されることによつて、該ターミナル部分が熱
電対３の冷接点として機能する。而して、制御回
路４において、あらかじめ設定されている設定温
度の信号と上記信号線９a，９b内を伝送されてき
た上記検出信号とが比較演算され、該設定温度に
対応するヒート電流が算出される。該ヒート電流
はヒータ線６a，６bを経由してヒータ２へ供給さ
れ、第１恒温槽１の内部を加熱するようになつて
いる。尚、正特性ダイオード１０が第２恒温槽８
内の温度を検出する温度検出端として使用されて
いるため、第２図で主として温度検出端として使
用されている冷接点補償用ダイオード７は第３図
では不要となつている。 The operation of the embodiment of the present invention will be explained below.
In FIG. 3, when the temperature inside the first constant temperature bath 1 is detected by the thermocouple 3, the detection signal is transmitted to the signal line 9.
a , 9b and reaches the control circuit 4. on the other hand,
The positive temperature coefficient thermistor 10 is at a certain temperature (e.g. 80°C)
The resistance value changes greatly in the positive direction after reaching this temperature, and the heater current sent from the control circuit 4 via the heater wires 6a, 6b is supplied to the positive temperature coefficient thermistor 10 until the temperature reaches this temperature. The inside of the constant temperature bath 8 is heated. Furthermore, when the temperature inside the second thermostatic chamber 8 reaches the above temperature (for example, 80°C), the resistance value of the positive temperature coefficient thermistor 10 changes significantly in the positive direction, so that the control circuit 4 A heater current sent out from the heater wires 6a and 6b is supplied to the heater 2 to heat the inside of the first constant temperature oven 1. Due to the action of the positive temperature coefficient thermistor 10, the inside of the second thermostat 8 is maintained at the above temperature (e.g. 80°C), and the terminal portion of the thermocouple 3 is maintained at a constant temperature (e.g. 80°C). Become. Further, by maintaining the terminal portion at a constant temperature, the terminal portion functions as a cold junction of the thermocouple 3. Then, in the control circuit 4, the preset temperature signal and the detection signal transmitted through the signal lines 9a and 9b are compared and calculated, and the heat current corresponding to the set temperature is calculated. is calculated. The heat current is supplied to the heater 2 via heater wires 6 a and 6 b to heat the inside of the first constant temperature oven 1 . Note that the positive characteristic diode 10 is connected to the second constant temperature oven 8.
Since the cold junction compensation diode 7, which is mainly used as a temperature detection terminal in FIG. 2, is used as a temperature detection terminal for detecting the internal temperature, it is not necessary in FIG.
以上詳しく説明したような本考案の実施例によ
れば、前記第１従来例のように特殊な熱電対用補
償導線５a，５bを用いる必要もなく、また、前記
第２従来例のように信号線９a，９dを４本も必要
とするようなことはない。すなわち、熱電対用補
償導線として特殊なものを用いず且つその使用本
数も少なくて済むという利点を有する。また、熱
電対３のターミナル部分が第２恒温槽８内で一定
温度に保持されて熱電対３の冷接点として機能す
るため、制御回路４′内に冷接点補償回路を設け
る必要がなくなり、前記第１および第２の従来例
に使用される制御回路４に比して上記制御回路
４′の構成が簡単になる等の利点も有する。更に、
前記第１および第２の従来例に比し、上記冷接点
補償回路および／または信号線９c，９d等が不要
となるため、トータル的な部品点数が減少しメー
カも作り易く且つユーザも保守等がし易くなる等
の利点も有する。 According to the embodiment of the present invention as described in detail above, there is no need to use special thermocouple compensation conductors 5 a and 5 b as in the first conventional example, and there is no need to use special compensating conductors 5 a and 5 b as in the second conventional example. There is no need for as many as four signal lines 9a and 9d . That is, there is an advantage that a special compensating conductor for thermocouples is not required and the number of compensating conductors used is small. Further, since the terminal portion of the thermocouple 3 is maintained at a constant temperature in the second constant temperature oven 8 and functions as a cold junction of the thermocouple 3, there is no need to provide a cold junction compensation circuit in the control circuit 4'. There is also an advantage that the configuration of the control circuit 4' is simpler than the control circuit 4 used in the first and second conventional examples. Furthermore,
Compared to the first and second conventional examples, since the cold junction compensation circuit and/or the signal lines 9c , 9d , etc. are not required, the total number of parts is reduced, making it easier for manufacturers to manufacture and for users. It also has advantages such as easier maintenance.
第１図は第１従来例の構成説明図、第２図は第
２従来例の構成説明図、第３図は本考案実施例の
構成説明図である。
１……第１恒温槽、２……ヒータ、３……熱電
対、４，４′……制御回路、５a，５b……補償導
線、６a，６b……ヒータ線、７……冷接点補償用
ダイオード、８……第２恒温槽、９a，９d……信
号線、１０……正特性サーミスタ。
FIG. 1 is an explanatory diagram of the configuration of a first conventional example, FIG. 2 is an explanatory diagram of the configuration of a second conventional example, and FIG. 3 is an explanatory diagram of the configuration of an embodiment of the present invention. DESCRIPTION OF SYMBOLS 1...First thermostat, 2...Heater, 3...Thermocouple, 4, 4'...Control circuit, 5a , 5b ...Compensation lead wire, 6a , 6b ...Heater wire, 7... ...Cold junction compensation diode, 8...Second constant temperature oven, 9a , 9d ...Signal line, 10...Positive characteristic thermistor.
Claims (1)
タを有し一定の温度に温度制御される第１の恒温
槽と、該第１恒温槽の近くに該第１恒温槽と分離
して設けられると共に周囲温度よりも高い一定温
度に保たれて前記熱電対の冷接点となる第２の恒
温槽と、前記熱電対からの検出信号を受けるとあ
らかじめ設定された設定温度に対応させて前記加
熱用ヒータへヒータ線を介して供給されるヒート
電流を制御する制御回路とを具備し、前記第２恒
温槽内に前記ヒータ線から前記加熱用ヒータに並
列接続するようにして正特性サーミスタを設け、
該正特性サーミスタの抵抗値が正方向に大きく変
化する温度に前記第２恒温槽の温度を保つことを
特徴とする恒温槽。 a first thermostatic chamber that has a thermocouple that detects the internal temperature and a heater and is temperature-controlled to a constant temperature, and is provided near the first thermostatic chamber and separated from the first thermostatic chamber; a second constant temperature bath that is maintained at a constant temperature higher than the ambient temperature and serves as a cold junction of the thermocouple; and a second constant temperature bath that is kept at a constant temperature higher than the ambient temperature and serves as a cold junction of the thermocouple; and a control circuit for controlling a heat current supplied through a heater wire, and a positive temperature coefficient thermistor is provided in the second constant temperature oven so as to be connected in parallel from the heater wire to the heating heater,
A constant temperature bath, characterized in that the temperature of the second constant temperature bath is maintained at a temperature at which the resistance value of the positive temperature coefficient thermistor changes significantly in the positive direction.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP972882U JPS58113109U (en) | 1982-01-27 | 1982-01-27 | Constant temperature bath |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP972882U JPS58113109U (en) | 1982-01-27 | 1982-01-27 | Constant temperature bath |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS58113109U JPS58113109U (en) | 1983-08-02 |
| JPH0110643Y2 true JPH0110643Y2 (en) | 1989-03-28 |
Family
ID=30022349
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP972882U Granted JPS58113109U (en) | 1982-01-27 | 1982-01-27 | Constant temperature bath |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS58113109U (en) |
-
1982
- 1982-01-27 JP JP972882U patent/JPS58113109U/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS58113109U (en) | 1983-08-02 |
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