JP2011191139A - Temperature control device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a temperature control device capable of performing high-accuracy temperature control by an inexpensive constitution. <P>SOLUTION: The temperature control device 11 includes: a connection terminal 19 connected to a thermocouple for detecting the temperature of an object of temperature control; a temperature-sensitive element 21 for detecting the temperature of the connection terminal 19; a circuit board 17b to which the temperature-sensitive element 21 is mounted, and which compensates a measured temperature on the basis of a temperature input from the connection terminal 19 and the temperature detected by the temperature-sensitive element 21; a terminal block 24 to which the connection terminal 19 and a terminal metal fitting 20 as a contact part for bringing the connection terminal 19 into contact with the circuit board 17b are fitted; and a partitioning part 26 for separating a region where the temperature-sensitive element 21 is arranged from its outside region. In this case, the circuit board 17b is fixed to the terminal block 24 so as to maintain a connection state in the terminal metal fitting 20, and the separated state by the partitioning part 26. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a temperature control device, and more particularly to a temperature control device including a cold junction compensation element that compensates a measured temperature.

  Some conventional temperature control devices include a cold junction compensation element that detects the temperature of a connection terminal to which a thermocouple is connected, that is, a so-called temperature sensing element, in order to improve the accuracy of the temperature to be measured. A technique related to such a temperature control device is disclosed in Japanese Utility Model Laid-Open No. 2-69735 (Patent Document 1).

  According to Patent Document 1, the temperature control device includes a thermocouple that detects the temperature of a measurement target, a temperature sensing element that detects the temperature of a connection terminal to which the thermocouple is connected, and a thermocouple measurement temperature by the temperature sensing element. And an input circuit for compensation. In the conventional temperature control device, the temperature of the connection terminal is detected using the temperature sensing element, and the temperature compensation of the temperature control object is performed to improve the accuracy of the measured temperature.

Japanese Utility Model Publication No. 2-69735

  An example of the configuration of a conventional temperature control device typified by Patent Document 1 will be briefly described. FIG. 6 is a perspective view showing the appearance of a conventional temperature control device. FIG. 7 is an exploded perspective view showing the conventional temperature control device shown in FIG. 6 in an exploded manner. Here, from the viewpoint of easy understanding, of the temperature control devices, the side on which the later-described front part is disposed is the front side of the temperature control device, and the side on which the later-described terminal block is disposed is the rear side of the temperature control device. To do. Specifically, in the perspective views shown in FIGS. 6 and 7, the right side of the drawing is the front side, and the left side of the drawing is the rear side.

  Referring to FIGS. 6 and 7, a conventional temperature control apparatus 101 includes a thin plate-like front unit 104 in which a display unit 102 for displaying a measured temperature, an operation unit 103 for inputting settings, and the like are arranged on the front surface. Three circuit boards 105a, 105b, and 105c that perform control of the display unit 102, input processing in the operation unit 103, compensation of the measured temperature, and the like, and a space on the inner side, the circuit boards 105a to 105c A rear case 106 serving as a housing that covers the outer side, and a plurality of connections that are attached to the rear side of the rear case 106 and that are connected to a conductor connected to a thermocouple (not shown) and a conductor connected to another device. A terminal block 107 serving as a base on which a terminal (not shown) and a terminal fitting (not shown) for bringing the connection terminal and the circuit board 105c into contact with each other are provided. A power supply 108 is attached to the circuit board 105a that is disposed on the leftmost side when viewed from the front portion 104 side. The circuit board 105c arranged at the rightmost position when viewed from the front portion 104 side is provided with a temperature sensitive element (not shown) used when performing temperature compensation of the temperature control object.

  The front part 104 and the three circuit boards 105a to 105c are integrated. Specifically, the rectangular circuit boards 105a to 105c are arranged in parallel, and the front sides of the circuit boards 105a to 105c are integrated so as to be attached to the rear surface on the rear side of the front portion 104. . The rear case 106 and the terminal block 107 are also integrated.

  Here, in the temperature control apparatus 101 described above, the front portion 104 is provided so as to be detachable from the rear case 106. Specifically, an engagement portion that enables engagement between the front portion 104 and the rear case 106 is provided for each. And it is comprised so that the front part 104 side can be detached | attached from the rear case 106 side so that the front part 104 may be pulled out to the front side. The state where the front part 104 is detached is the state shown in FIG. 7, and the state where the front part 104 is attached is the state shown in FIG. Such a configuration is called a so-called draw-out type. For example, while the rear case 106 side is fixed to a measuring device or a control device, the front portion 104 is pulled out from the front side and a front portion 104 of another specification is mounted. It is possible to facilitate replacement and maintenance of the front portion 104.

  Here, when such a draw-out configuration is adopted, the following problems may occur. In a state where the front portion 104 is inserted into the rear case 106 and attached to the rear case 106 side, it is necessary to make a part of the circuit boards 105a to 105c and a part of the terminal fitting attached to the terminal block 107 contact each other. There is. This is to ensure electrical connection between the connection terminal and the circuit board.

FIG. 8 is an enlarged cross-sectional view showing a part of the terminal block 107. FIG. 8 shows a state where the front portion 104 is mounted. 6 to 8, the terminal block 107 is provided with a metal connection terminal 111 to which a conductive wire is connected and a terminal fitting 112 for connecting the connection terminal 111 and the circuit board 105c. Some of the terminal fitting 112 is shaped leaf spring, and can be elastically deformed in the left-right direction indicated by direction or the opposite direction of the arrow X ₁ in FIG. The circuit board 105c is removable from the up and down direction indicated by direction or the opposite direction of the arrow X ₂ in FIG.

  When the circuit board 105c is inserted into the rear case 106, the circuit board 105c comes into contact with the leaf spring-shaped terminal fitting 112 at the contact portion 114 of the one surface 113a of the circuit board 105c. The temperature control apparatus 101 having such a configuration is called a so-called card edge type. A temperature sensitive element 115 is provided on the other surface 113b of the circuit board 105c.

  Here, in order to ensure reliable conduction between the connection terminal 111 and the circuit board 105c, it is necessary to maintain good contact between the circuit board 105c and the terminal fitting 112 when the circuit board 105c is mounted. Then, it is necessary to reliably maintain the contact pressure state such as the spring pressure of the leaf spring portion of the terminal fitting 112 and the contact angle at the contact portion 114. It is also necessary to apply gold plating or the like on the contact portion 114 of the circuit board 105c. That is, when such a draw-out mechanism is employed, the apparatus itself becomes expensive in order to maintain an appropriate contact state between the terminal fitting 112 and the circuit board 105c when the circuit board 105c is mounted.

  The following problems also occur. The temperature sensitive element 115 is provided on the circuit board 105c. In order to detect the temperature of the connection terminal 111 strictly, the temperature sensitive element 115 is not affected by heat from the outside as much as possible. It is desirable to do. Furthermore, the temperature sensitive element 115 is preferably provided as close to the connection terminal 111 as possible. Therefore, in the temperature control device 101, the temperature sensing element 115 is configured to be disposed in the accommodation region 116 that is the same accommodation space as the connection terminal 111 when the front portion 104 is inserted into the rear case 106 side. ing. The accommodation area 116 is configured by a plurality of walls 117 a, 117 b, and 117 c called barriers provided on the terminal block 107.

  Here, when the circuit board 105c is mounted, in order to allow the circuit board 105c to be inserted and removed while ensuring the reliable placement of the temperature sensitive element 115 in the accommodation area 116, the wall portion constituting the accommodation area 116 is used. In 117a, it is necessary to secure a wide opening region 118 through which the temperature sensing element 115 passes. In such a state where the wide opening region 118 is provided, heat on the circuit board 105c side is transferred to the accommodation region 116 in which the temperature sensitive element 115 is disposed, which is not preferable. In particular, since the power supply 108 that generates a high temperature during use is present in the internal space 119, it is desirable to block the accommodation region 116 and the internal space 119 as much as possible. However, considering the reliable arrangement of the temperature sensitive element 115 in the accommodation region 116, there is a limit to the narrowing of the opening region 118. Under such circumstances, there is a possibility that exact temperature compensation cannot be performed.

  An object of the present invention is to provide a temperature control device capable of performing highly accurate temperature control with an inexpensive configuration.

  A temperature control device according to the present invention is provided with a connection terminal connected to a thermocouple for detecting the temperature of a temperature control object, a temperature sensing element for detecting the temperature of the connection terminal, and a temperature sensing element attached thereto. Based on the temperature input from the terminal and the temperature detected by the temperature sensing element, a circuit board that compensates the measured temperature, a terminal block to which a connection terminal and a contact portion that contacts the connection board and the circuit board are attached, A partition portion is provided to partition the region where the temperature element is disposed and the external region thereof. Here, the circuit board is being fixed to the terminal block so that the connection state in a connection part and the separation state by a partition part may be maintained.

  Since the temperature control device having such a configuration is partitioned so that the region where the temperature sensing element is disposed and the external region are separated by the partition portion, the temperature control device is affected by the temperature of the external region. Can be greatly reduced. In this case, since the circuit board is fixed to the terminal block so as to maintain the separated state, the influence of the temperature of the external region can be reduced more reliably. If it does so, the temperature of a connecting terminal can be detected more correctly. Therefore, the accuracy of temperature control can be increased. Further, since the terminal block and the circuit board are fixed so as to maintain the contact state with the connection terminal, it is not necessary to provide a complicated mechanism. Therefore, an inexpensive configuration can be obtained.

  Note that the term “fixing” used here is not only to fix completely firmly, but if the connection state at the connection part and the separation state by the partitioning part can be maintained, the relative slight movement between the circuit board and the terminal block can be maintained. An acceptable degree of fixation.

  Preferably, the connection terminal is disposed in a region partitioned by the partition portion and where the temperature sensitive element is disposed. By doing so, the temperature of the connection terminal can be detected more accurately and the accuracy of temperature control can be increased.

  In addition, the partition part may be comprised by a part of terminal block.

  As a preferred embodiment, the partition portion is composed of a member having heat insulation properties. Also by doing so, the temperature of the connection terminal can be detected more accurately and the accuracy of temperature control can be improved.

  More preferably, the region that is partitioned by the partitioning portion and in which the temperature sensitive element is disposed is a sealed space. By doing so, the influence of the temperature from the outside can be reduced more reliably.

  Moreover, you may comprise so that the area | region where the temperature sensitive element may be partitioned off by the partition part may be at least partially filled with the member which has heat insulation.

  More preferably, a power supply for supplying electricity to the circuit board is provided, and the power supply is provided in an external region. By doing so, it is possible to reduce the influence of heat from the power source that generates a relatively high temperature.

  According to such a temperature control device, since the partition portion separates the region where the temperature sensing element is arranged from the external region, the temperature sensing element is affected by the temperature of the external region. It can be greatly reduced. In this case, since the circuit board is fixed to the terminal block so as to maintain the separated state, the influence of the temperature of the external region can be reduced more reliably. If it does so, the temperature of a connecting terminal can be detected more correctly. Therefore, the accuracy of temperature control can be increased. Further, since the terminal block and the circuit board are fixed so as to maintain the contact state with the connection terminal, it is not necessary to provide a complicated mechanism. Therefore, an inexpensive configuration can be obtained.

It is a functional block diagram which shows the schematic structure of the temperature control apparatus which concerns on one Embodiment of this invention. It is a perspective view which shows the external appearance of the temperature control apparatus which concerns on one Embodiment of this invention. FIG. 3 is a perspective view showing a state where a rear case is removed in the temperature control device shown in FIG. 2. It is sectional drawing at the time of cut | disconnecting the temperature control apparatus shown in FIG. It is an expanded sectional view at the time of cut | disconnecting the temperature control apparatus shown in FIG. It is a perspective view which shows the external appearance of the conventional temperature control apparatus. It is a disassembled perspective view which decomposes | disassembles and shows the conventional temperature control apparatus. It is an expanded sectional view which expands and shows the terminal with which the conventional temperature control apparatus is equipped.

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a block diagram showing a schematic configuration of a temperature control device 11 according to an embodiment of the present invention. FIG. 2 is a perspective view showing an appearance of the temperature control device according to the embodiment of the present invention. FIG. 3 is a perspective view showing a part of the temperature control device 11 shown in FIG. 4 is a cross-sectional view of the temperature control device 11 taken along the line IV-IV in FIG. FIG. 5 is an enlarged cross-sectional view of the temperature control device 11 taken along the line VV in FIG. From the viewpoint of easy understanding, in FIGS. 2 to 4, the right side of the page is the front side and the left side of the page is the rear side. That is, the direction indicated by the arrow A ₁ shown in FIGS. 2-5, the front side.

  With reference to FIGS. 1-5, the temperature control apparatus 11 which concerns on one Embodiment of this invention is used when performing temperature control in the temperature control target object 12, such as a machine apparatus component, for example. An example of temperature control in the temperature control device 11 will be briefly described. First, the thermocouple 13 is attached to the temperature control object 12. The temperature of the temperature control object 12 is detected by the attached thermocouple 13. Then, temperature compensation is performed based on the temperature of the connection terminal using a temperature sensitive element and a circuit board described later. Finally, the temperature data after temperature compensation is displayed.

  In addition, the structure provided with the thermocouple 13 may be sufficient as the temperature control apparatus 11 as needed, and the structure provided with the heater 14 which can raise the temperature control target object 12 by electricity supply may be sufficient as it. . Further, the temperature control device 11 uses, for example, PID (Proportional Integral Differential) control to turn on / off the power supplied to the heater 14 provided near the temperature control object 12 based on the measured temperature. Thus, a temperature adjustment mechanism that adjusts the temperature control object 12 within a set temperature range may be provided.

  The temperature control device 11 according to an embodiment of the present invention has a substantially rectangular parallelepiped shape. In this embodiment, the shape is long in the front-rear direction. The temperature control device 11 includes a display unit 15 that displays the measured temperature, an operation unit 16 that includes a push button that inputs a set temperature, measurement conditions, and the like, a circuit board 17 that performs temperature compensation, and the like. A power supply 18 that supplies electricity, a connection terminal 19 that is connected to a thermocouple 13 that detects the temperature of the temperature control object 12 via a conductor (not shown), the connection terminal 19, and the circuit board 17 are brought into contact with each other. A terminal fitting 20 as a contact portion and a temperature sensing element 21 for detecting the temperature of the connection terminal 19 are provided. In this embodiment, two circuit boards 17 are provided. A plurality of connection terminals 19 are also provided, and a plurality of terminal fittings 20 are also provided according to the number of connection terminals 19. The connection terminal 19 and the terminal fitting 20 are made of metal. For example, the connection terminal 19 is made of a metal screw, and the lead wire is connected to the connection terminal 19 so that the lead wire is sandwiched between the connection terminal 19 and the terminal fitting 20 and screwed.

  Further, the temperature control device 11 includes a front portion 22 provided with a display unit 15 and an operation unit 16 on the front surface thereof, a rear case 23 covering the outer sides of the two circuit boards 17a and 17b, and a plurality of connection terminals. 19 and a terminal block 24 to which the terminal fitting 20 is attached.

  The front part 22 is substantially rectangular and has a thin plate shape. The display unit 15 is disposed above the front surface of the front unit 22, and the operation unit 16 is disposed below the front surface of the front unit 22. The display unit 15 displays the measured temperature in a digital display. The operation unit 16 is provided with a plurality of push buttons for inputting information such as raising and lowering of the temperature display area.

  The rear case 23 has a substantially quadrangular prism shape, and has a cylindrical shape, that is, a space on the inner side. In this inner space, the two circuit boards 17a and 17b are accommodated. The rear case 23 is provided with a plurality of holes penetrating from the outer side to the inner side on each surface. The opening of the hole has a rectangular shape and is provided so as to extend in the front-rear direction. With the plurality of holes provided in the rear case 23, heat generated in the circuit board 17 and the like is released to the outside in the temperature control device 11, and air permeability in the temperature control device 11 is improved. The rear case 23 is attached to the front portion 22 side by engaging a part thereof with an engaging portion 25 provided on the front portion 22. FIG. 3 shows a state where the rear case 23 is removed from the front portion 22.

  The terminal block 24 is made of resin. The terminal block 24 has a configuration in which a plurality of connection terminals 19 and terminal fittings 20 can be arranged in the vertical direction.

  Here, the front part 22, the two circuit boards 17a and 17b, and the terminal block 24 are configured to be integrated. Specifically, the two circuit boards 17a and 17b are provided substantially in parallel along the front-rear direction. Then, one side of the front side of the two circuit boards 17a and 17b is attached and fixed to the back surface which is the rear side of the front portion 22. In addition, one side of the rear side of the two circuit boards 17a and 17b is attached and fixed to the front surface which is the front side of the terminal block 24. The front part 22, the circuit boards 17a and 17b, and the terminal block 24 are attached and fixed to each other in this way. In this embodiment, as viewed from the front portion 22 side, a circuit board 17a provided with a power source 18 is attached on the left side, and a circuit board 17b provided with a temperature sensitive element 21 is attached on the right side. The rear case 23 is configured to be attached by being engaged with the engaging portion 25 of the front portion 22 so as to be inserted from the terminal block 24.

  The temperature sensing element 21 is provided on the surface 28b which is the inner side of the circuit board 17b. The terminal fitting 20 and the circuit board 17b are provided in contact with each other on the outer surface 28a of the circuit board 17b. When the circuit board 17 b and the terminal block 24 are fixed, the surface 28 a and the terminal fitting 20 are fixed so as to come into contact with each other at the connection portion 27. That is, the connection terminal 19 is electrically connected at the connection portion 27 through the terminal fitting 20. The connection at the connecting portion 27 between the terminal fitting 20 and the circuit board 17b is, for example, connected by soldering.

  The terminal block 24 is provided with a partition portion 26 that separates the region where the temperature sensing element 21 provided on the circuit board 17b is disposed from the inner region 30 of the rear case 23 serving as the outer region. It has been. In this embodiment, the partition portion 26 is formed by three thin plate-like wall portions 29a, 29b, and 29c. The three wall portions 29 a to 29 c are configured by a part of the terminal block 24.

  The temperature sensitive element 21 is arranged in a housing area 31 that is a housing space formed by the three walls 29a to 29c. In addition, the connection terminal 19 is also disposed together with the terminal fitting 20 in the accommodation region 31 in which the temperature sensitive element 21 is disposed. That is, the connection terminal 19, the terminal fitting 20, and the temperature sensitive element 21 are disposed in the same accommodation region 31. The temperature sensing element 21 is provided at a position close to the connection terminal 19. The accommodation region 31 and the internal region 30 are completely separated by the three walls 29a to 29c and the circuit board 17b. This separated state is a state maintained by fixing the terminal block 24 and the circuit board 17b.

  That is, such a temperature control device 11 is partitioned by the partition portion 26 so as to separate the region where the temperature sensing element 21 is disposed from the inner region 30 of the rear case 23 which is the outer region. The influence of the temperature in the external region can be greatly reduced with respect to the temperature element 21. In this case, since the circuit board 17b is fixed to the terminal block 24 so as to maintain the separated state, the influence of the temperature of the external region can be reduced more reliably. Then, the temperature of the connection terminal 19 can be detected more accurately. Therefore, the accuracy of temperature control can be increased. Further, since the terminal block 24 and the circuit board 17b are fixed so as to maintain the contact state with the connection terminal 19, it is not necessary to provide a complicated mechanism. Therefore, an inexpensive configuration can be obtained.

  In this case, the accommodation area can be completely sealed. Therefore, the temperature of the connection terminal can be detected more accurately, and the accuracy of temperature control can be improved.

  In the above-described embodiment, the accommodation area is not particularly sealed, that is, filled with air. However, the present invention is not limited to this, and a part of the accommodation area has a heat insulating property. It is good also as filling with the member which has. By doing so, the influence of the temperature of the external region can be further reduced, and the temperature of the connection terminal can be detected more strictly. Furthermore, it is good also as filling with the member which has heat insulation about the whole area | region of an accommodation area | region.

  In the above embodiment, the accommodation area is completely sealed. However, the present invention is not limited to this, and some openings may be provided. In this case, of course, the size of the opening is greatly different from the above-described conventional drawout type temperature control device in that it does not originate from the size of the temperature sensing element.

  In the above-described embodiment, the partition portion is configured by a part of the terminal block, but is not limited thereto, and may be configured by another member.

  In the above embodiment, the configuration includes two circuit boards. However, the configuration is not limited to this, and a configuration including a plurality of circuit boards may also be used. In this case, from the viewpoint of space efficiency, the two circuit boards may be arranged in parallel. In other words, it is desirable that the circuit board 17a provided with the power supply and the circuit board 17b provided with the temperature sensitive element be positioned farthest away.

  In the above embodiment, the rear case is configured to be detachable. However, the configuration is not limited thereto, and the rear case is fixed to the front portion and the terminal block so that the rear case cannot be detached. May be.

  As mentioned above, although embodiment of this invention was described with reference to drawings, this invention is not limited to the thing of embodiment shown in figure. Various modifications and variations can be made to the illustrated embodiment within the same range or equivalent range as the present invention.

  The temperature control device according to the present invention is effectively used when strict temperature control is required.

  DESCRIPTION OF SYMBOLS 11 Temperature control apparatus, 12 Temperature control object, 13 Thermocouple, 14 Heater, 15 Display part, 16 Operation part, 17, 17a, 17b Circuit board, 18 Power supply, 19 Connection terminal, 20 Terminal metal fitting, 21 Temperature sensing element, 22 front part, 23 rear case, 24 terminal block, 25 engaging part, 26 partition part, 27 connecting part, 28a, 28b surface, 29a, 29b, 29c wall part, 30 internal area, 31 accommodating area.

Claims (7)

A connection terminal connected to a thermocouple for detecting the temperature of the temperature control object;
A temperature sensing element for detecting the temperature of the connection terminal;
The temperature sensing element is attached, and based on the temperature input from the connection terminal and the temperature detected by the temperature sensing element, a circuit board for compensating the measured temperature;
A terminal block to which a contact portion for contacting the connection terminal and the connection terminal with the circuit board is attached;
A partition portion for partitioning the region where the temperature sensing element is disposed and the external region thereof;
The temperature control device, wherein the circuit board is fixed to the terminal block so as to maintain a connection state in the connection portion and a separation state by the partition portion. The temperature control device according to claim 1, wherein the connection terminal is disposed in a region partitioned by the partition portion and in which the temperature sensitive element is disposed. The temperature control device according to claim 1, wherein the partition portion is configured by a part of the terminal block. The said partition part is a temperature control apparatus in any one of Claims 1-3 comprised by the member which has heat insulation. The temperature control device according to any one of claims 1 to 4, wherein a region partitioned by the partition portion and disposed with the temperature sensitive element is a sealed space. The temperature control device according to any one of claims 1 to 5, wherein at least part of the region partitioned by the partition portion and disposed with the temperature sensitive element is filled with a heat insulating member. A power supply for supplying electricity to the circuit board;
The temperature control device according to claim 1, wherein the power source is provided in the external region.

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