JP4698377B2 - air conditioner - Google Patents

Description

  The present invention relates to a temperature controller including a thermal expansion type temperature-displacement conversion element.

There exists what was disclosed by prior patent document 1 as this kind of temperature controller. FIG. 14 shows the operating principle of the temperature controller. Specifically, a setting dial 401, a support shaft 402 that moves up and down according to the rotation of the setting dial 401, and a thermal expansion type temperature-displacement conversion element that moves up and down as the support shaft 402 moves. There is provided a dual diaphragm 404 and a potentiometer 409 for generating an electric signal corresponding to the position of the contact 408 at the tip of the elastic contact piece 407 via a lever 405 and a push button 406 for the vertical movement of the dual diaphragm 404. It was possible to control the operating capacity of air conditioners, heating devices, cooling devices, and the like. Therefore, the potentiometer 409 is an essential component in this type of temperature controller.
The operation principle is as shown in the prior patent document 1, but in the actual product, since each part such as a thermal expansion type temperature-displacement conversion element is arranged in the casing, there are many parts and complicated mechanisms. Had.

And when the temperature detection part which detects the temperature of the target object heated or cooled becomes reference | standard temperature, it was necessary to adjust so that the scale of a setting dial may show the reference | standard temperature.
The structure around the setting dial was complicated and laminated, and the place to operate for adjusting the scale of the reference temperature was not on the surface, but it was difficult to see. Also, because it was out of reach, it had to be adjusted by hand using special tools, so even a skilled worker had to spend time.
Once the reference temperature has been adjusted, the scale will shift due to aging. Further, as described above, since it is difficult to adjust the reference temperature, the scale cannot be adjusted at the installation site.
Therefore, when a deviation occurs in the scale, after being collected in the factory, a skilled worker adjusts the deviation of the reference temperature scale using a special tool.

Shokai 52-128080

In the conventional product, when the scale is displaced, it is necessary to collect the product and readjust the skilled worker with a special tool over time.
The present invention has been made paying attention to the above-described circumstances, and provides a temperature regulator that can easily readjust the scale without using a special tool in the field.

  A temperature controller according to the present invention includes a setting knob that is rotated to a position corresponding to a set temperature, a setting screw that moves to a position corresponding to the rotation position of the setting knob, and a thermal expansion type temperature-displacement conversion element. Display unit for confirming the position of the pointer in a temperature controller including a potentiometer and a wiper having a contactor that changes a contact position in accordance with a displacement obtained by adding a displacement of the set screw and a displacement of the set screw A nut holding member to which the nut is fixed, the setting screw that moves in the axial direction with respect to the nut, a lock plate that holds one end of the setting screw on the rear surface, and the lock A setting groove provided on the outer periphery of the plate, a protrusion provided on the front surface of the lock plate, having a thread on the inner periphery and the outer periphery, and an indicator holding nut, are detachably held by the protrusion. And indicators, and guidance and adjustment mark displayed on the indicator, in which a setting knob which is detachably screwed to the projecting portion.

  According to the present invention, the scale can be easily readjusted on site without sending the product back to the factory and without using a special tool.

Embodiment 1 FIG.
FIG. 1 is an exploded perspective view of the temperature controller of the first embodiment. FIG. 2 is a cross-sectional view of the temperature controller according to Embodiment 1 of the present invention.
The mounting screw 2 is passed through the mounting hole provided in the wall 4 and the main body mounting hole 6 provided in the back surface of the main body 5 of the temperature controller 1, and the mounting nut 3 is screwed into the mounting screw 2. The regulator 1 is fixed to the wall 4.
A cover mounting hole 7 is provided on the front surface of the main body portion 5, and the cover portion 8 is fixed to the main body portion 5 using mounting screws 9 from the front surface of the cover portion 8. Holes 320 are provided in the upper surface and the lower surface of the main body 5 and are used as outlets for wiring that needs to be connected to an external device such as a hollow tube or wiring.

  The inner casing 11 is fixed to the main body 5 with screws or the like (not shown). The internal casing 11 includes a knob unit 12 having a setting knob 202 and the like, a conversion element unit 15 having a thermal expansion type temperature-displacement conversion element 14 (hereinafter referred to as conversion element 14), and a potentiometer unit having a potentiometer 17 and the like. 18 is attached.

FIG. 3 shows an overall view (a) and an exploded view (b) of the potentiometer unit 18. 4 shows a view of the potentiometer unit 18 with the cover 22 removed and viewed from the direction A in FIG.
The potentiometer unit 18 includes a case 20, a cover 22, a potentiometer mounting plate 21, a wiper 24, an operating piece 25, a potentiometer 17, and the like. The potentiometer 17 is attached by being screwed into the mounting hole 36 of the potentiometer mounting plate 21 which also functions as a heat radiating plate with a metal member. The potentiometer mounting plate 21 is attached to the case 20 by screwing screws 27 into mounting holes 37 provided in the potentiometer mounting plate 21. The configuration is such that the heat generated by the potentiometer 17 is effectively discharged from the potentiometer unit 18 via the potentiometer mounting plate 21 which is a heat radiating plate. Output terminals 33 to 35 are provided below the surface of the case 20 on which the potentiometer mounting plate 21 is mounted.

  The contact 50 at the tip of the wiper 24 is in contact with the potentiometer 17 in an assembled state. As shown in FIG. 4, the other end of the wiper 24 is fixed to the case 20 and the metal member 32 by caulking the metal member 32 provided on the plastic case 20, and the wiper 24 is interposed via the metal member. 3 is electrically connected to the output terminal 35 shown in FIG. As shown in FIG. 4, cords 41, 42 are connected to both ends of the potentiometer 17, and the other ends of the cords 41, 42 are connected to metal members 30, 31 provided in the case 20. Both ends of 17 are electrically connected to output terminals 33 and 34 shown in FIG. 3 via cords 41 and 42 and metal members 30 and 31, respectively.

The cover 22 is provided with a hole 53 through which the protrusion 52 of the operating piece 25 can pass, and a guide 54 is provided in the cover 22 for holding the operating piece 25 in a state where the protrusion 52 is inserted into the hole. Yes. The operating piece 25 is movable in the vertical direction (C direction) toward the surface of the cover 22 in a state where the projection 52 is inserted into the hole 53 and the operating piece 25 is held by the guide 54.
The protrusion 52 of the operating piece 25 and the abutting portion 56 on the other end side are in an assembled state so as to abut on a substantially intermediate position 51 of the wiper shown in FIG. The intermediate position 51 of the wiper has a shape that spreads in the transverse direction with respect to the wiper length direction so as to stably contact the contact portion 56.

As shown in FIG. 4, a mounting hole 62 into which the mounting screw 27 is screwed is provided on the back surface of the case 20, and the case 20 and the cover 22 are fixed by the mounting screw 27.
When the operating piece 25 moves in the C direction shown in FIG. 3 in the assembled state, a force is applied from the operating piece 25 to the intermediate position 51 of the wiper, and the wiper contact 50 is also in the D direction parallel to the C direction. The wiper contact 50 moves in the direction B while contacting the surface of the potentiometer 17.
FIG. 5 shows a connection diagram of a proportional temperature controller using the potentiometer 17. As the temperature of the object to be measured rises, the resistance value between the output terminals 33 and 35 and 35 and 34 changes when the surface of the potentiometer 17 is moved in the F direction while the wiper contact 50 is in contact therewith. The resistance value is measured and used for temperature control.

According to this embodiment, since the potentiometer 17, the wiper 24, etc. can be accommodated in the case 20 and unitized, assembly and replacement of parts are facilitated.
In particular, since there are no other electrical parts other than the potentiometer unit 18 in the main body 5 of the temperature controller 1, if it is found that there is an obvious problem with the electrical system, such as disconnection, the potentiometer unit 18 is installed. Since it only needs to be replaced, it can be repaired on site without being brought back to the factory.
Even if the cover portion 8 is removed, the potentiometer 17 and the wiper 24 are not exposed to the outside, so that dust does not enter the potentiometer unit 18, thereby preventing the accuracy and deterioration of the potentiometer 17 and preventing product life. And the number of maintenance inspections can be reduced.

  By making the potentiometer 17 into a unit, a compact structure is obtained. Moreover, since the potentiometer mounting plate 21 is a heat sink having a high heat transfer effect, such as metal, and the potentiometer 17 is mounted on the potentiometer mounting plate 21, the heat generated by the potentiometer 17 is effectively discharged to the outside. Thus, expansion and contraction due to heat of the potentiometer 17 does not occur, and control can be performed accurately, and failure due to heat generated from the potentiometer 17 can be prevented.

  Next, the conversion element unit 15 will be described. As shown in FIG. 2, the conversion element unit 15 is accommodated in the inner casing 11. The conversion element unit 15 includes a first lever 90, a conversion element 14, springs 91 and 92, a second lever 86, a variable dial 80, and the like. The first lever 90 is composed of a plate member having a step. The plate-like first lever 90 is provided substantially parallel to the back surface of the main body 5. The connecting member 103 that extends from the side surface of the inner casing 11 and is connected to the shaft 186 (see FIG. 1) substantially parallel to the bottom surface of the inner casing by the first lever 90 and the screw 104 is rotatable about the shaft 186. It is fixed.

  The conversion element 14 having a disk shape and sealed with a thermal expansion gas such as Freon is communicated with a temperature measuring unit (not shown) containing Freon inside and a hollow tube, and the temperature measuring unit comes into contact with the measurement object. As a result, the freon inside the temperature measuring section expands and compresses, and the freon pressure inside the conversion element communicating with the inside of the temperature measuring section increases. Similar to the dual diaphragm shown in the conventional example, when the freon pressure increases, the conversion element 14 extends in the vertical direction (G direction) toward the surface of the first lever 90 as shown in FIG. The conversion element 14 includes a disk-shaped member in which the above-described freon is sealed, a protrusion 120 provided on one surface of the disk-like shape, and a screw-like portion 121 provided on the other surface of the disk-like shape, As the temperature rises, the distance between the front end of the protrusion 120 and the first lever 90 increases. The thermal expansion gas may not be Freon, but may be other thermal expansion gas as long as it is a stable gas that hardly changes in quality.

The first lever 90 in the vicinity of the connecting member 103 is provided with a fixing hole 105 for the conversion element 14, and the screw-shaped portion 121 of the conversion element 14 is inserted into the fixing hole 105, and the conversion is performed by using the nut 106. The element 14 is fixed to the first lever 90.
One end of a spring 91 is fitted into the depression 95 provided on the back surface of the inner casing 11, and the other end of the spring 91 is fitted with a depression 99 provided on the back surface of the first lever 90. The one lever 90 is pressed from the inner casing 11. The end face of the projection 120 is always urged so as to contact a setting screw 208 described later.
FIG. 6 shows the vicinity of the variable dial 80 provided on the surface of the first lever 90. A variable dial 80 is provided on the surface of the connecting member 103 and the first lever 90 on the other end side so as to be rotatable about a dial shaft 81. A scale is displayed on the variable dial 80, and a ball 82 fixed by a clip 83 is provided on the variable dial 80 opposite to the scale.

By rotating the variable dial 80, the position of the ball on the first lever 90 is moved. As shown in FIG. 6C, when the setting pointer 351 is set to the scale 2 of the variable dial 80, the distance between the ball 82 and the conversion element 14 is increased as shown in FIG. As shown in FIG. 6B, when the setting pointer 351 is set to the scale 20 of the variable dial 80, the distance between the ball 82 and the conversion element 14 is shortened as shown in FIG.
As shown in FIG. 2, the plate-like second lever 86 is provided substantially in parallel with the first lever 90, and a bent portion 112 is provided on a side portion of the second lever 86, and a through hole is formed in the bent portion 112. 111 is provided. A shaft 85 (see FIG. 1) extending from the side surface of the inner casing 11 and substantially parallel to the bottom surface of the inner casing 11 is inserted into the through-hole 111, so that the second lever 86 is pivotally fixed around the shaft 85. Has been.

The other end of the second lever 86 is provided with an abutting portion 113 that abuts against the protrusion 52 of the operating piece 25. The displacement due to the rotation of the second lever is transmitted to the projection 52 of the operating piece 25 via the contact portion 113.
The spring 92 urges the second lever 86 so that the second lever 86 is always in contact with the ball 82.

  FIG. 7 is a principle diagram showing that the proportional band can be changed. The shafts 186 and 85 are fixed to the inner casing 11. When the temperature of the object to be measured changes and the conversion element 14 is displaced, a force acts on the conversion element contact position of the first lever 90, and the first lever 90 rotates about the shaft 186 by the displacement of the conversion element 14. Even when the ball 82 is in the (c) position (proportional band 2 ° C.) or in the (d) position (proportional band 20 ° C.), the rotation angle of the first lever 90 does not change. Then, the displacement is transmitted to the positions (c) and (d) of the ball 82. Further, since the ball 82 acts on the second lever 86 that can rotate around the shaft 85, the displacement applied to the wiper 24 is different. That is, the distance a of the contact position of the conversion element 14 from the shaft 186, the distance c from the shaft 186 to the ball position (c), the distance d from the shaft 186 to the ball position (d), the ball position from the shaft 85 When the distance g to (c), the distance f from the shaft 85 to the ball position (d), and the distance from the shaft 85 to the wiper contact position b are appropriately determined, a setting pointer as shown in FIG. When 351 is set to the display numerical value 2 of the variable dial 80, the proportional band is set to 2 ° C., and when the setting pointer 351 is set to the display numerical value 20 of the variable dial 80 as shown in FIG. Setting. Of course, if the variable dial is rotated and changed to an intermediate temperature, the proportional band can be set to an arbitrary temperature.

  FIG. 8 is a diagram showing the relationship between the proportional band and the resistance value. When the proportional band is 2 ° C, the resistance changes from 0 to 135Ω at 2 ° C around the set point temperature as shown by the solid line, and when the proportional band is 20 ° C, the set point is shown by the broken line. The resistance value changes from 0 to 135Ω at 20 ° C. centering on the temperature. The proportional band can be changed according to the purpose of use.

Next, the knob unit 12 will be described. FIG. 9 shows an exploded perspective view (a), a side view (b), and an assembled perspective view (c) of the knob unit. FIG. 10 shows a diagram in which the nut 209 is fixed to the mounting bracket 210 by fastening caulking.
The knob unit 12 includes a mounting bracket 210, a nut 209, a lock plate 206, an indicator 204, a setting knob 202, and the like.

  The mounting bracket 210 that is a holding member for the nut 209 has a shape obtained by bending a plate material, and the mounting bracket 210 is provided with a mounting hole for crimping and fixing the nut 209. Further, a setting groove 211 is provided by bending a part of the mounting bracket 210. The setting groove 211 is a display unit for confirming the position of a pointer described later. The nut 209 is attached to the mounting bracket 210 by fastening caulking 214. At the time of mounting, the nut 209 rotates when a certain force or more is applied to the nut 209, but it is crimped to such an extent that it does not rotate even if a weak force is applied to the nut 209.

  In addition to caulking, for example, as shown in FIG. 11, the mounting bracket 210 and the wavy washer 250 are sandwiched between the nut 209 and the nut 220, so that even if a weak force is applied to the nut 209, it does not rotate. When a force is applied to the nut 209, the nut 209 may be rotated.

  The lock plate 206 is a substantially disk-like plate, and has holes 223 at four locations on the surface and a lock plate setting groove 222 at a part of the circumference. A setting screw 208 that is coupled to the nut 209 is provided on the surface of the disk-shaped plate, and a protrusion 207 is provided on the back surface of the lock plate 206. The lock plate 206 has a function as a holding member that holds the setting screw 208. A screw groove that can be screwed with the set screw 201 is provided on the inner periphery of the protruding portion 207, and a screw groove that can be screwed with the nut 203 is provided on the outer periphery.

  A disk-shaped indicator 204 having a concave and convex surface has a hole 231 through which a set screw 201 can be inserted, and an adjustment temperature dot mark 230 for on-site adjustment is provided on the outer periphery of the disk-shaped surface. A pointer 205 is displayed on the surface of the ring-shaped convex portion on the slightly inner circumference side of the temperature dot mark 230. Further, two elongated openings 232 are provided in the concave portion on the slightly inner peripheral side of the pointer 205 (see FIG. 13 described later). The indicator 204 is used as a display unit that displays the pointer 205 and a member that displays the dot mark 230.

A hole 234 through which the set screw 201 can be inserted is provided in the center of the cylindrical setting knob 202, and a recess 235 (see FIG. 2) in which the nut 203 can be stored is provided on the back side. Further, two protrusions 225 that can be inserted into the holes 223 of the lock plate 206 are provided on the back surface side.
The setting screw 208 of the lock plate 206 is attached to the nut 209 of the mounting bracket 210, the protrusion 207 of the lock plate 206 is inserted into the hole 231 of the indicator 204, and the outer periphery of the protrusion 207 and the nut 203 are screwed together. The indicator 204 is fixed to the above. Further, in a state where the nut 203 is housed in the recess 235 of the setting knob 202, the setting knob 202 is locked by locking the set screw 201 and the screw on the inner peripheral surface of the protrusion 207 of the lock plate 206. Secure to.

Since the protrusion 225 provided on the back surface of the setting knob 202 penetrates the elongated groove 232 of the indicator 204 and is fitted into the hole 223 of the lock plate 206, the setting knob 202 and the lock plate 206 are integrated without moving in the rotational direction. It becomes.
Further, the friction wire 212 is attached to the back side of the surface of the mounting bracket 210 where the nut 209 is attached, and the knob unit 12 is assembled as shown in FIGS. 9B and 9C.
When the setting knob 202 is rotated to the right side in the assembled state of the knob unit 12, the setting screw 208 of the lock plate 206 is axial with respect to the nut 209, and the friction wire 212 side (the H direction shown in FIG. 9B). ). When the setting knob 202 is rotated to the left, it moves to the opposite side.

  By fitting a protrusion 301 (see FIG. 1) provided on the inner casing 11 into an elongated groove 302 (see FIG. 9) provided with a nut 209 of the mounting bracket 210 of the knob unit 12 on the attachment surface, The tip of the setting screw 208 is brought into contact with the protrusion 120 of the conversion element 14 after being assembled to the casing 11. Further, the potentiometer unit 18 is assembled to the inner casing 11 using the screw hole 306 (see FIG. 3) and the screw 305 (see FIG. 1) provided on the side surface of the potentiometer unit 18, and the protrusion 52 of the operating piece 25 is connected to the second lever. It abuts on the abutting portion 113 of 86.

Next, adjustment at the factory before shipment will be described. FIG. 12 shows a drawing for explaining the adjustment in the factory. With the cover 8 removed, the temperature measuring unit (not shown) is heated or cooled to the reference temperature. In response to heating or cooling, the conversion element 14 and the freon in the temperature measuring unit expand or contract, and when a predetermined time elapses, the conversion element 14 expands and contracts in the G direction shown in FIG.
The nut 209 shown in FIG. 12 rotates when a certain force or more with respect to the mounting bracket 210 is applied to the nut 209. However, the nut 209 does not rotate even when a weak force is applied to the nut 209. It is caulked.

With reference to the length of the conversion element at the reference temperature, as shown in FIG. 12A, the adjustment spanner 350 is attached to the nut 209 so that the setting groove 211 of the mounting bracket 210 and the indicator 205 of the indicator 204 coincide. The nut 209 is rotated using the adjusting spanner 350 as shown in FIG.
Even if the nut 209 is rotated by the adjustment spanner 350, the setting screw 208 does not move in the axial direction (H direction in FIG. 9B), so that the setting screw 208 is set on the end face of the projection 120 of the conversion element 14 at the reference temperature. The indicator 205 can be adjusted to indicate the setting groove 211 in a state where the tip of the screw 208 is in contact.

After the adjustment, in order not to operate the nut 209 at the site, a seal prohibiting the operation may be attached to prevent the operator from shifting the setting at the site.
Conventionally, since it was assembled in a stack, the inside was not visible, special tools were used, and adjustments had to be made by groping. According to the form, it is a generally used spanner, and even a normal person who is not a skilled worker can easily adjust.

Next, the control using this temperature controller will be described by taking as an example a case where the fluid flowing through the pipe is controlled to be constantly heated to 40 ° C.
The installation method, usage method, and the like of the heater, controller, and temperature detector are the same as those conventionally used. The temperature controller 1 is installed on the wall plate at the site, and the temperature detector is installed in the pipe in a state where the conversion element 14 and the temperature detector installed in the pipe are connected via a hollow tube. A heater is provided upstream of the temperature detection unit, and the amount of power flowing to the heater is controlled by the controller. And the cable wired to the terminals 33-35 of the temperature controller 1 is connected to the controller.

The setting knob 202 is rotated so that the indicator 204 has a scale of 40 ° C. printed on the surface of the cover 8. Assuming that the fluid in the pipe upstream of the heater flows at a substantially constant temperature of 30 ° C., the freon in the temperature measuring section is 30 ° C., and the volume of freon in the conversion element 14 is also equivalent to 30 ° C. The length in the G direction of FIG. 2 is also equivalent to 30 ° C.
Then, the setting knob 22 is at a position corresponding to 40 ° C. and a detection temperature of 30 ° C., and the first lever 90 is moved to the corresponding position around the shaft 186. Then, the movement of the first lever 90 is transmitted to the wiper 24 via the second lever 86 and the operating piece 25.

When the controller is turned on in this state, the power of the heater rises so as to heat the heater. As electric power rises, the fluid is heated and the temperature of the fluid rises. As the temperature of the fluid rises, the temperature of the freon in the temperature measuring unit rises. Then, the conversion element 14 extends to a length corresponding to the temperature of the increased freon, and the change in the length of the conversion element 14 is changed at the contact point between the potentiometer 17 and the contact 50 of the wiper 24 via the first lever 90 or the like. Communicate to change.
When the controller is controlled so that the heater power corresponds to the resistance of the terminal, and the indicator scale is 40 ° C., the controller controls the heater power so that the fluid temperature is 40 ° C.

  When the temperature of the fluid upstream of the heater is decreased or the flow rate of the fluid is increased, the temperature downstream of the heater is decreased, the volume of freon in the temperature detecting unit is decreased, and the length of the conversion element 14 is shortened. The change in the length of the conversion element 14 is transmitted to the change in the contact position between the contact 50 of the wiper 24 and the potentiometer 17 via the first lever 90 and the second lever 86. The contact point between the contact 50 and the potentiometer 17 moves to the opposite side to the F direction shown in FIG.

  The inter-terminal resistance value is changed by the movement of the contact 50, and the controller that detects the change controls the heater power to increase. An increase in the heating amount of the heater raises the temperature of the fluid, resulting in a change in the freon volume in the temperature measuring section and the length of the conversion element 14, and the contact position between the potentiometer 17 and the contact 50 of the wiper 24 moves in the F direction. However, if the fluid temperature and flow rate upstream of the heater are constant, the heater power can be controlled so that the fluid temperature becomes 40 ° C. at the temperature detecting portion.

Even if the above-described adjustment is performed at the time of shipment from the factory, the reference temperature may be shifted due to various factors. FIG. 13 is a diagram showing the on-site adjustment.
For example, in a facility that heats a fluid to 23 ° C., a case where the fluid is heated to 25 ° C. even when the setting knob 202 is set to 23 ° C. will be described.
As shown in FIG. 11D, the set screw 201 is removed, the setting knob 202 is removed, and the nut 203 is removed. By removing the nut 203, the indicator 204 can be rotated with respect to the lock plate 206.

  In the shipping state, as shown in FIG. 13B, the dot mark 230 of the indicator 204 is set so as to indicate the setting groove 222. In this embodiment, since it is set so that it can be adjusted at 2 ° C. with 1 dot, as shown in FIG. 11A, the indicator 204 is rotated leftward by one dot toward the minus side. In this state, the nut 203 is tightened, the setting knob 202 is fixed with the set screw 201, and the lock plate 206, the indicator 204, and the setting knob 202 are fixed together. By doing in this way, -2 degreeC can be adjusted for the temperature shift | offset | difference which becomes 2 degreeC high.

FIG. 11 (c) shows the adjustment of the indicator 204 when the fluid is heated to 21 ° C. even if the setting knob 202 is set to 23 ° C. in the equipment that heats the fluid to 23 ° C. It is. By rotating the indicator 204 rightward by one dot toward the plus side, + 2 ° C. can be adjusted.
Conventionally, it has been a configuration that cannot be adjusted in the field, but according to the present embodiment, the indicator 204 remains fixed with the position of the setting screw 208 and the position of the end surface of the projection 120 of the conversion element 14 being fixed. Since the position of the pointer 205 can be shifted, the deviation of the reference temperature can be easily adjusted at the site with a simple tool such as a screwdriver.

It is a disassembled perspective view of the temperature regulator which shows Embodiment 1 of this invention. It is sectional drawing of the temperature regulator which shows Embodiment 1 of this invention. It is the whole potentio unit (a) and exploded view (b) which show Embodiment 1 of this invention. It is the figure which looked at FIG.3 (b) of this invention from the A direction. It is a connection diagram of the proportional type temperature controller using the potentiometer of Embodiment 1 of this invention. It is a figure of the variable dial vicinity provided on the surface of the 1st lever of Embodiment 1 of this invention. FIG. 7 is a principle diagram showing that the proportional band can be changed. It is a figure showing the relationship between the proportional band and resistance value of Embodiment 1 of this invention. It is a disassembled perspective view (a), a side view (b), and an assembled perspective view (c) of the knob unit according to Embodiment 1 of the present invention. It is a figure which is fixing the nut to the attachment bracket of Embodiment 1 of this invention by fastening caulking. It is the figure which fixed the attachment bracket and nut of Embodiment 1 of this invention by the other method. It is a figure which shows the method of adjusting the temperature controller of Embodiment 1 of this invention in a factory. It is a figure which shows the method of adjusting the temperature regulator of Embodiment 1 of this invention on the spot. It is a figure which shows the principle of operation of the temperature controller of a prior art example.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Temperature controller 5 Main-body part 8 Cover part 11 Inner casing 12 Knob unit 14 Thermal expansion type temperature-displacement conversion element (conversion element)
DESCRIPTION OF SYMBOLS 15 Conversion element unit 17 Potentiometer 18 Potentiometer unit 20 Case 21 Potentiometer mounting plate 22 Cover 24 Wiper 25 Actuation piece 23-35 Output terminal 50 Contact 52 Projection 53 Hole 54 Guide 80 Variable dial 82 Ball 85 Shaft 86 2nd lever 90 1st 1 Lever 91, 92 Spring 103 Connecting member 113 Abutting portion 186 Shaft 202 Setting knob 203 Nut 204 Indicator 205 Pointer 206 Lock plate 207 Projection portion 208 Setting screw 209 Nut 210 Mounting bracket 211 Setting groove 214 Fastening caulking 222 Lock plate setting groove 230 Dot mark

Claims (1)

A setting knob that is rotated to a position corresponding to the set temperature, a setting screw that moves to a position corresponding to the rotation position of the setting knob, an expansion amount of the thermal expansion type temperature-displacement conversion element, and a displacement of the setting screw In a temperature controller comprising a potentiometer and a wiper having a contact at its free end that changes the contact position in response to the displacement
A nut holding member having a display part for confirming the position of the pointer and having the nut fixed;
The setting screw that moves in the axial direction according to the amount of rotation with respect to the nut;
A lock plate for holding one end of the setting screw on the rear surface;
A setting groove provided on the outer periphery of the lock plate;
Protrusions provided on the front surface of the lock plate and having threads on the inner periphery and outer periphery;
An indicator that is detachably held by the protrusion by an indicator holding nut;
A pointer and an adjustment mark displayed on the indicator;
A temperature controller comprising: the protrusion and a setting knob fixed detachably.

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