CN1949115A - Attemperator - Google Patents

Abstract

The invention provides a thermoregulator which ensures high accuracy over a long period of time, long product lifetime, reduced frequency of maintenance, and facilitates assembling at factory by employing a structure to minimize the possibility of entering of dusts into a potentiometer. A potentiometer mounting plate (21) is provided at the front side of a case (20), while a cover (22) is attached to the rear side of the case (20). Then, a potentiometer (17) is fixed to the potentiometer mounting plate (21), and a wiper (24) is housed in the case (20), and a working piece (25), which transmits any displacement of a setting screw (208) to the wiper (24), is retained on the inner wall of the cover (22).

Description

Temperature regulator

Technical field

The present invention relates to be provided with the temperature regulator of thermal expansion type temperature-displacement conversion element.

Background technology

In patent documentation 1, disclosed this temperature regulator.Figure 14 has shown the principle of work of temperature regulator.Specifically, temperature regulator comprises: the bolster 402 of setting index dial 401, moving in the vertical direction with the rotation of this settings index dial 401, with the thermal expansion type temperature-displacement conversion element that moves up and down that moves of this bolster 402, generates moving up and down of described upper diaphragm 404 with the pot 409 of the corresponding electric signal in position of the contact element 408 on elastic contact chip 407 tops, can control the operational capacity that aircondition or heating arrangement, cooling device etc. install according to this signal by bar 405, button 406 promptly two diaphragms 404.Therefore, pot 409 becomes necessary structural member in this temperature regulator.

Though in patent documentation 1, disclosed its principle of work, in the product of reality,, therefore, had the parts of One's name is legion, complicated mechanism owing in housing, be provided with thermal expansion type temperature-various parts such as displacement conversion element.

And the structure that the parts suitable with pot 409 in the patent documentation 1 and elastic contact chip 407 adopt is that in case remove the lid of housing, pot just exposes outside, and they are made of parts tiny especially, that quantity is very many.

Patent documentation 1: real opening clear 52-128080 number

Summary of the invention

In product in the past, because near the parts the pot are less, the quantity of parts is more, therefore, and the manufacturing time and effort consuming in factory.In addition, when carrying out on-the-spot maintenance, it is very difficult decomposing assembling.

In addition, owing to adopted pot to expose, therefore the structure that dust is easy to enter, exists following problem: potentiometric temperature is adjusted precision and is reduced easily, and pot is easy to deterioration, and life of product is short, and maintenance overhaul often.

The present invention be directed to that above situation makes, its purpose is to provide a kind of temperature regulator, and this temperature regulator adopts dust to be difficult to enter potentiometric structure, can keep high precision for a long time, and make the life of product lengthening, and frequency of maintenance reduces.

In addition, assembling and on-the-spot maintenance overhaul that the present invention is devoted to factory are easy to carry out, and try hard to cut down the manufacturing cost that maintenance overhaul spent.

Temperature regulator of the present invention is provided with: setting knob, and this setting knob can be turned to the position corresponding with design temperature; Bolster, this bolster can move to the position corresponding with the turned position of described setting knob; Potentiometer wiper, free end at this potentiometer wiper has contact element, described contact element can be according to the amount sum of the thermal expansion type temperature-swell increment of displacement conversion element and the displacement of described bolster, change and potentiometric contact position, wherein, front surface at housing is provided with the pot installing plate, be provided with lid overleaf, simultaneously, described pot is fixed on the described pot installing plate, described potentiometer wiper is packed in the housing, and the braking plate that makes displacement with described bolster be passed to described potentiometer wiper remains on the inwall of described lid.

According to the present invention, a kind of temperature regulator can be provided, this temperature regulator adopts dust to be difficult to enter potentiometric structure, can keep high precision for a long time, and can make the life of product lengthening, and frequency of maintenance reduces.

In addition, because it is integrated with having realized in the housings of packing into such as pot, therefore, it is easy that assembling in the factory becomes, taken place at pot under the situation of fault, can tackle by changeing housing, therefore, on-the-spot maintenance overhaul becomes easily, and can reduce and make the required cost of maintenance overhaul.

Description of drawings

Fig. 1 is the decomposition diagram of the temperature regulator of demonstration embodiments of the invention 1.

Fig. 2 is the cut-open view of the temperature regulator of demonstration enforcement 1 of the present invention.

Fig. 3 has shown the current potential unit of embodiments of the invention 1, (a) is overview, (b) is exploded view.

Fig. 4 has shown the view of seeing from the A direction of Fig. 3 (b) of the present invention.

Fig. 5 has shown the wiring diagram that has used potentiometric proportion expression temperature regulator in the embodiments of the invention 1.

Fig. 6 has shown near the view that is arranged in the embodiments of the invention 1 the lip-deep variable full scale dish of the 1st bar.

Fig. 7 is for showing the schematic diagram that can change proportional band.

Fig. 8 has shown the relation of proportional band and resistance value in the embodiments of the invention 1.

Fig. 9 has shown the release button unit in the embodiments of the invention 1, (a) is decomposition diagram, (b) is side view, (c) is assembling view.

Figure 10 has shown in embodiments of the invention 1 and by fastening riveted joint nut has been fixed on the installation bracket.

Figure 11 has shown in embodiments of the invention 1 and by other method nut and installation bracket has been fixed.

Figure 12 has shown the method for adjusting the temperature regulator of embodiments of the invention 1 in factory.

Figure 13 has shown the method for adjusting the temperature regulator of embodiments of the invention 1 at the scene.

Figure 14 is the figure of the principle of work of temperature regulator in the example that shows prior art.

Embodiment

Embodiment 1

Fig. 1 is the decomposition diagram of the temperature regulator of present embodiment 1.Fig. 2 is the cut-open view of the temperature regulator of embodiment 1 among the present invention.

By the main body mounting hole 6 on main part 5 back sides that mounting screw 2 passed be arranged on the mounting hole on the wall 4 and be arranged on temperature regulator 1, and nut 3 will be installed twist and are combined on the mounting screw 2, temperature regulator 1 will be fixed on the wall 4.

On the front surface of main part 5, be provided with and cover mounting hole 7, with mounting screw 9, cap 8 is fixed on the main part 5 from the front of cap 8.On the upper surface of main part 5 and lower surface, be provided with hole 320, its as be connected with the external device (ED) outlet of necessary wiring such as hollow tube, wiring.

By not shown screw etc., inner shell 11 is fixed on the main part 5.On inner shell 11, the current potential unit 18 of release button unit 12 with setting knob 202 grades being installed, having thermal expansion type temperature-displacement conversion element 14 the conversion element unit 15 of (below, be called conversion element 14) etc. and have pot 17 etc.

Fig. 3 has shown current potential unit 18, (a) is overview, (b) is exploded view.In addition, Fig. 4 has shown dismantled the views that lid 22 backs are seen from the A direction of Fig. 3 (b) in current potential unit 18.

Current potential unit 18 comprises housing 20, lid 22, pot installing plate 21, potentiometer wiper 24, braking plate 25, pot 17 etc.Pot installing plate 21 is metal parts, and it also plays the effect of heat sink.By screw 26 being screwed in the mounting hole 36 of pot installing plate 21, pot 17 is installed.In addition, by screw 27 is screwed in the mounting hole 37 that is arranged on the pot installing plate 21, pot installing plate 21 is installed on the housing 20.By pot installing plate 21 as heat sink, formation can be effectively from the current potential unit 18 structures of discharging the heat that pots 17 are produced.In housing 20, install pot installing plate 21 face below be provided with output with terminal 33～35.

The contact element 50 on potentiometer wiper 24 tops contacts with pot 17 under the state that assembles.As shown in Figure 4, be located at metalwork 32 on the plastic casing 29, the other end of potentiometer wiper 24 is fixed on housing 20 and the metalwork 32 by riveted joint.Potentiometer wiper 24 is electrically connected with terminal 35 with output shown in Figure 3 by metalwork.As shown in Figure 4, electric wire 41,42 is linked to each other with the two ends of pot 17, the other end of electric wire 41,42 is linked to each other with metalwork 30,31 on being arranged on housing 20, whereby, the two ends that make pot 17 form by electric wire 41,42 and metalwork 30,31 and with lead-out terminal 33,34 shown in Figure 3 respectively and are electrically connected.

Be provided with the hole 53 that the projection 52 of braking plate 25 can be passed on 22 at lid, in addition, also be provided with the guide member 54 that keeps braking plate 25 under with projection 52 states that insert in the hole on the lid 22.Keep under the state of braking plate 25 in protruding 52 patchholes 53 and by guide member 54, braking plate 25 can move to the surface of lid 22 along the direction (C direction) perpendicular to lid 22.

The projection 52 of braking plate 25 and another distolateral docking section 56 contact with the roughly centre position 51 of potentiometer wiper shown in Figure 4 under the state that assembles.The centre position 51 of potentiometer wiper forms with respect to the shape of potentiometer wiper length direction along lateral widening, so that stably contact with docking section 56.

As shown in Figure 4, be provided with the mounting hole 62 that is screwed into mounting screw 27 at the back side of housing 20, housing 20 and lid 22 be fixed together by mounting screw 27.

Under the state that assembles, when braking plate 25 when C direction shown in Figure 3 moves, braking plate 25 just applies power to the centre position 51 of potentiometer wiper, the contact element 50 of potentiometer wiper is also moved along the D direction parallel with the C direction, and the contact element 50 of potentiometer wiper moves in the surperficial state of contact lower edge B direction with pot 17.

Fig. 5 has shown the wiring diagram of the proportion expression temperature regulator that has used pot 17.Be accompanied by the temperature of measuring thing and rise, the contact element 50 of potentiometer wiper is contacting and is moving along the F direction with the surface of pot 17, so output changes with the resistance value between the terminal 33 and 35,35 and 34.Measure this resistance value, and use it in the temperature control.

According to this embodiment, because pot 17, potentiometer wiper 24 etc. is contained in the housing 20, can realize integratedly, therefore, the replacing of assembling and parts has become easily.

Particularly, because on the main part 5 of this temperature regulator 1, except current potential unit 18, the parts that do not have other electrical system, therefore, during the problem that in judging electrical system such as broken string, obviously exists, as long as it is just passable to change current potential unit 18, therefore, need not it is taken back factory, at the scene place under repair.

Even remove cap 8 owing to adopted, pot 17, potentiometer wiper 24 can not be exposed to outside structure yet, therefore, dust can not enter 18 inside, current potential unit, reduce and deterioration so can prevent the precision of pot 17, can make the life of product lengthening, reduce the number of times of maintenance overhaul.

Integrated by pot 17 is formed, can make it form compact structure.In addition, even its locking structure gathers, also because it utilizes the heat sink of good heat conduction effect such as metal to make pot installing plate 21, and pot 17 is installed on the pot installing plate 21, therefore, the hot type that can effectively pot 17 be produced is to outside, and what can not take place that heat by pot 17 causes is flexible etc., thereby can correctly control, simultaneously, can also prevent the fault that causes by the heat that pot 17 produces.

Below, conversion element unit 15 is described.As shown in Figure 2, packed in conversion element unit 15 in the inner shell 11.Conversion element unit 15 comprises the 1st bar 90, conversion element 14, spring the 91,92, the 2nd bar 86, variable full scale dish 80 etc.The 1st bar 90 is made of the plate with ladder.In addition, the 1st tabular bar 90 is provided with the back side of main part 50 is roughly parallel.Axle 186 (referring to Fig. 1) side of housing 11 internally extend, and it and inner shell bottom surface are roughly parallel.Relative this axle 186, the web member 103 that links to each other with the 1st bar 90 by screw 104 can be that the center is fixed rotationally with axle 186.

Conversion element 14 in the form of annular discs and at inner sealing the thermal expansion gas as freon.The structure that this conversion element 14 is adopted is: be communicated with the not shown thermometric portion that accommodates freon in inside by hollow tube, and thermometric portion contact measurement thing, thereby the freon of thermometric portion inside can inflate compression, can rise with the pressure of the freon of the conversion element inside of thermometric portion internal communication.Identical with the two diaphragms shown in the example of prior art, if the pressure of freon rises, then as shown in Figure 2, conversion element 14 along perpendicular to the direction (G direction) of the 1st bar 90 to the elongation of the surface of the 1st bar 90.Conversion element 14 have above-mentioned inclosure have freon disc-shaped part, be arranged on discoid one lip-deep protruding 120 and be arranged on discoid another lip-deep screw division 121, follow temperature to rise, the distance elongation of the top of projection 120 and the surface of contact of the 1st bar 90.In addition, thermal expansion gas can not adopt freon, so long as the stabilizing gas that is difficult to go bad also can adopt other thermal expansion gas.

On near the 1st bar 90 the web member 103, be provided with the fixed orifice 105 of conversion element 14 usefulness, in the screw-like portion 121 insertion fixed orifices 105 with conversion element 14, conversion element 14 be fixed on the 1st bar 90 with nut 106.

One end of spring 91 is chimeric with the recess 95 that is arranged on inner shell 11 back sides, makes the other end of spring 91 chimeric with the recess 99 that is arranged on the 1st bar 90 back sides, by inner shell 11 pushings the 1st bar 90.Projection 120 end face all the time so that its be loaded with mode that the described setting screw 208 in back contacts.

Fig. 6 has shown near the view that is arranged on the lip-deep variable full scale dishes 80 of the 1st bar 90.On opposite with web member 103 one distolateral surface on the 1st bar 90, being provided with to be the variable full scale dish 80 that rotate at the center with index dial axle 81.On variable full scale dish 80, show scale, on the variable full scale dish 80 of scale opposition side, be provided with the spheroid of fixing by intermediate plate 83 82.

By variable full scale dish 80 is rotated, the position of the spheroid on the 1st bar 90 is moved.When shown in Fig. 6 (c), when making the scale 2 of setting indicator 351 aligning variable full scale dishes 80, shown in Fig. 6 (a), spheroid 82 is elongated with the distance of conversion element 14, when shown in Fig. 6 (d), when making the scale 20 of setting indicator 351 aligning variable full scale dishes 80, shown in Fig. 6 (d), spheroid 82 shortens with the distance of conversion element 14.

As shown in Figure 2, roughly be provided with the 2nd tabular bar 86 concurrently, be provided with bend 112, simultaneously, on bend 112, be provided with through hole 111 at the sidepiece of the 2nd bar 86 with the 1st bar 90.The side of housing 11 internally stretched out and insert in the through hole 111 with roughly parallel axle 85 (referring to the Fig. 1) in inner shell 11 bottom surfaces, whereby, with the 2nd bar 86 be that the mode of center rotation is fixed with axle 85.

On the other end of the 2nd bar 86, be provided with the docking section 113 that contacts with the projection 52 of braking plate 52.By docking section 113, transmit the displacement that the rotation by the 2nd bar causes to the projection 52 of braking plate 25.

92 pairs the 2nd bars 86 of spring load, so that the 2nd bar 86 contacts spheroid 82 all the time.

Fig. 7 is for showing the schematic diagram that can change proportional band.Axle 186,85 is fixed in the inner shell 11.If measure the temperature variation of thing, conversion element 14 is subjected to displacement, and then strong in the effect of the conversion element docking location place of the 1st bar 90, the 1st bar 90 is the displacement that conversion element 14 is rotated at the center with axle 186.In the position of spheroid 82 is under the situation of (c) position (2 ℃ of proportional bands), and is that the rotational angle of the 1st bar 90 is constant under the situation of (d) position (20 ℃ of proportional bands).Then, displacement is passed to the position (c) of spheroid 82 and (d).In addition, can be that point on the 2nd bar 86 that rotates of center is different with axle 85 owing to act on spheroid 82, therefore, make also difference of displacement that potentiometer wiper 24 takes place.Promptly, if suitably determine from axle 186 to conversion element 14 docking location apart from a, from axle 186 to spheroid position (c) distance c, from axle 186 to spheroid position (d) apart from d, from axle 85 to spheroid position (c) apart from g, from axle 85 to spheroid position (d) apart from f and distance from axle 85 to potentiometer wiper docking location b, then when shown in Fig. 6 (c), when making the demonstration numerical value 2 of setting indicator 351 aligning variable full scale dishes 80, proportional band is set at 2 ℃; When shown in Fig. 6 (d), when making the demonstration numerical value 20 of setting indicator 351 aligning variable full scale dishes 80, proportional band is set at 20 ℃.Self-evident, if make the variable full scale dish rotate, change to its middle temperature, then proportional band can be set at temperature arbitrarily.

Fig. 8 has shown the relation of proportional band and resistance value.When proportional band is set at 2 ℃, shown in solid line, be the center with the set point temperatures, in 2 ℃, make resistance value change into 135 Ω from 0, when proportional band is set at 20 ℃, shown in dotted line, with the set point temperatures is the center, makes resistance value change into 135 Ω from 0 in 20 ℃.Can be according to change proportional bands such as application targets.

Below, release button unit 12 is described.Fig. 9 has shown release button unit, (a) is decomposition diagram, (b) is side view, (c) is assembling view.Figure 10 has shown by fastening riveted joint nut 209 has been fixed on the installation bracket 210.

Release button unit 12 comprises installation bracket 210, nut 209, lockplate 206, indicator 204, setting knob 202 etc.

As the installation bracket 210 of the keeper of nut 209 be make sheet bending shape, on installation bracket 210, be provided with the mounting hole that is used for riveted and fixed nut 209.In addition, make the part bending of installation bracket 210 and setting slot 211 is set.Setting slot 211 is the described display part that is used to confirm pointer position in back.By fastening rivet 214, nut 209 is assemblied on the installation bracket 210.When mounted, though when applying certain power more than certain degree on nut 209, nut 209 can rotate,, nut 209 is applied its degree that also can not rotate of more weak power even nut 209 should be riveted.

Except riveted joint, can also be for example, as shown in figure 11, by installation bracket 210 and corrugated pad 250 are clamped between nut 209 and the nut 220, even apply more weak power on nut 209, nut 209 can not rotate yet, still, if the power more than applying to a certain degree on the nut 209, then nut 209 rotates.

Lockplate 206 is discoid plate roughly, 4 positions in its surface are respectively equipped with hole 223, and, on the part of its circumference, be provided with lockplate setting slot 222, on discoid plate surface, be provided with the setting screw 208 that combines with nut 209, on the inside surface of lockplate 206, be provided with lug boss 207.Lockplate 206 has the function as the keeper that keeps setting screw 208.On the interior week of lug boss 207, be provided with the thread groove that can form screw fit, on its periphery, be provided with and form the thread groove that screw thread is installed with nut 203 with stop screw 201.

The substantial middle place that has concavo-convex discoid indicator 204 on the surface is provided with the hole 231 that stop screw 201 can pass, show the on-the-spot adjustment temperature dot mark 230 of adjusting usefulness at discoid surperficial outer circumferential side, adjust temperature dot mark 230 slightly in display pointer 205 on the surface of annular convex of all sides.In addition, pointer 205 slightly in the recess of all sides, be provided with elongated open portion 232 (referring to the described Figure 13 in back) at 2 places.Discoid indicator 204 is as the display part of display pointer 205 and the parts that show dot mark 230.

Central authorities at setting knob 202 cylindraceous are provided with the hole 234 that stop screw 201 can pass, and face side is provided with the recess 235 (referring to Fig. 2) that can hold nut 203 within it.In addition, face side within it is provided with the projection 225 in the hole 223 that can pass lockplate 206 at 2 places.

The setting screw 208 of lockplate 206 is assemblied in the nut 209 of installation bracket 210, the lug boss 207 of lockplate 206 is inserted in the hole 231 of indicator 204, the be threaded periphery and the nut 203 of lug boss 207 are with respect to lockplate 206 fixed disc shape indicators 204.In addition, nut 203 is contained under the state in the recess 235 of setting knob 202, the screw thread of lug boss 207 inner peripheral surfaces of stop screw 201 and lockplate 206 is being twisted close, thereby setting knob 202 is fixed on the lockplate.

Since be arranged on the elongated slot 232 of the projection 225 break-through indicators 204 on setting knob 202 inside surfaces, and chimeric with the hole 223 of lockplate 206, and therefore, setting knob 202 can in rotational direction not stagger with lockplate 206, but by integrated.

In addition, friction line 212 is installed, and is assembled release button unit 12 as Fig. 9 (b) and (c) in the inner surface side of the face of the nut 209 that has assembled installation bracket 210.

Under the state that release button unit 12 is assembled, if setting knob 202 is rotated to the right, then the setting screw 208 of lockplate 206 moves to axial, friction line 212 sides (the H direction shown in Fig. 9 (b)) with respect to nut 209.If setting knob 202 is rotated to the left, then the setting screw 208 of lockplate 206 moves to opposition side.

Make the projection 301 (referring to Fig. 1) that is arranged on the inner shell 11 chimeric with the elongated slot 302 (referring to Fig. 9) of the nut 209 of the installation bracket 210 that on installed surface, is provided with release button unit 12, thereby release button unit 12 is assemblied in the inner shell 11, and the top of setting screw 208 is docked with the projection 120 of conversion element 14.In addition, utilize the threaded hole 306 (referring to Fig. 3) and the screw 305 (referring to Fig. 1) that are arranged on 18 sides, current potential unit, current potential unit 18 is installed in the inner shell 11, and the projection 52 of braking plate 25 is docked with the docking section 113 of the 2nd bar 86.

Below, before dispatching from the factory, the adjustment in factory describes.Figure 12 has shown the view of the adjustment that is used for illustrating factory.Under the state of having removed cap 8, with the heating of not shown thermometric portion or be cooled to reference temperature.Freon in conversion element 14 and the thermometric portion reacts to heating or cooling and expands or shrinks, and through official hour the time, the expansion of the G direction shown in Figure 2 of conversion element 14, contraction are calmed down.

With regard to nut shown in Figure 12 209, though during the power more than applying to a certain degree on nut 209, nut 209 can rotate,, on nut 209, apply its degree that also can not rotate of more weak power even nut 209 should be riveted.

Shown in Figure 12 (a), make adjustment spanner 350 chimeric, shown in Figure 12 (b), utilize adjustment spanner 350 that nut 209 is rotated with nut 209, the length of the conversion element during with reference temperature is benchmark, and the setting slot 211 of installation bracket 210 is aimed at the pointer 205 of indicator 204.

Even owing to nut 209 is rotated by adjusting spanner 350, set screw 208 also not vertically (Fig. 9 (b) H direction) move, therefore, can under the end face state of contact of the lug boss 120 of the conversion element 14 of the top of setting screw 208 during, fall pointer 205 and adjust to the state that makes its sensing setting slot 211 with reference temperature.

After adjustment, for fear of at the scene nut 209 being operated, also can stick the strip of paper used for sealing of quiescing, make the situation of setting dislocation at the scene thereby prevent the operator.

In the past, because with overlapped way assembling, therefore, inside be can't see, must utilize special instrument, adjust gropingly by hand, the skilled labor must spend certain hour just can carry out adjustment in this factory.And, utilize the general spanner that uses according to present embodiment, and need not skilled operating personnel, the ordinary people just can easily adjust.

Below, about the control of using this temperature regulator to carry out, be that example describes with the situation of the fluid that flows through pipe arrangement being carried out 40 ℃ heated at constant temperature.

The method to set up of well heater, controller, thermometric portion, using method etc. are with employed identical in the past.Temperature regulator 1 is set on the wallboard at the scene, and the thermometric portion in hollow tube makes conversion element 14 and is arranged on pipe arrangement links to each other, and under this state, portion is arranged in the pipe arrangement with thermometric.Provided upstream having heaters in thermometric portion is controlled the electric weight that flows to well heater by controller.And the cable that is arranged in the terminal 33-35 place of temperature regulator 1 links to each other with controller.

Rotate setting knob 202, make the pointed of indicator 204 be imprinted on 40 ℃ of cap 8 lip-deep scales.When the fluid in the pipe arrangement of well heater upstream stably flows under 30 ℃ basically, freon in the thermometric portion reaches 30 ℃, the volume of the freon in the conversion element 14 also becomes itself and 30 ℃ of suitable volumes, and the length of G direction also becomes and its 30 ℃ of suitable length among Fig. 2 of conversion element 14.

So, setting knob 22 reach 40 ℃, with 30 ℃ of suitable positions of detected temperatures, the 1st bar 90 is that the center moves to suitable with it position with axle 186.So the motion of the 1st bar 90 is passed to potentiometer wiper 24 through the 2nd bar 86, braking plate 25.

In this state, if connect the power supply of controller, then the electric weight of well heater rises so that heater heats.Follow the rising of electric weight, fluid is heated, and fluid temperature (F.T.) rises.Follow the rising of fluid temperature (F.T.), the temperature of the freon in the thermometric portion rises.So conversion element 14 is stretched to the suitable length of temperature with the freon that rises, the variation of the length of conversion element 14 is by the 1st bar 90 etc., to the variation transmission of the contact point of the contact element 50 of pot 17 and potentiometer wiper 24.

Controlling by controller, reaching the electric weight of the well heater corresponding with the resistance of terminal, is that the electric weight of controller control heater makes fluid temperature (F.T.) become 40 ℃ under 40 ℃ the situation at the scale of indicator.

Under the situation that the fluid temperature (F.T.) of well heater upstream reduces or the flow of fluid rises, the temperature in well heater downstream descends, and the volume of freon reduces in the thermometric portion, the contraction in length of conversion element 14.The variation of the length of conversion element 14 is through the 1st bar the 90, the 2nd bar 86, to the variation transmission of contact element 50 with the contact position of pot 17 of potentiometer wiper 24.Because the temperature of thermometric portion descends, contact element 50 moves to the opposition side of F direction shown in Figure 5 with the contact point of pot 17.

Because moving of contact element 50, the resistance value between terminal changes, detected after this situation controller so that the mode that the well heater electric weight rises control.The rising that adds heat of well heater is risen the temperature of fluid, the length of the volume of freon, conversion element 14 changes in the thermometric portion, pot 17 moves to the F direction with the contact position of the contact element 50 of potentiometer wiper 24, finally can control and make the well heater electric weight reach a value, when the well heater electric weight is worth for this, if the fluid temperature (F.T.) of well heater upstream, flow are certain, then in the position of thermometric portion, fluid temperature (F.T.) is 40 ℃.

Even carry out above-mentioned adjustment when dispatching from the factory, also for various reasons, deviation can appear in reference temperature.Figure 13 has shown the adjustment of carrying out at the scene.

Below, to for example in fluid being heated to 23 ℃ equipment, even setting knob 202 is aimed at 23 ℃, fluid also can be heated to 25 ℃ situation and describe.

Shown in Figure 13 (d), remove stop screw 201, remove setting knob 202, simultaneously, remove nut 203.Removing nut 203 makes indicator 204 to rotate relative to lockplate 206.

Under factory state, shown in Figure 13 (b), the  mark of the temperature dot mark 230 of indicator 204 is configured to point to the state of setting slot 222.In this embodiment, can adjust 2 ℃ form with 1 point, therefore, shown in Figure 13 (a), indicator 204 be turned left with amount to 1 point of minus side ("-" side) owing to set for.In this state, fastening nut 203, by stop screw 201 that setting knob 202 is fixing simultaneously, thus lockplate 206, indicator 204 and setting knob 202 are fixed into one.Whereby, can be with-2 ℃ of deviations of adjusting the temperature that has increased 2 ℃.

Figure 13 (c) has shown in fluid being heated to 23 ℃ equipment, even setting knob 202 is aimed at 23 ℃, fluid also only is heated under 21 ℃ the situation, to the adjustment of indicator 204.By making indicator 204 to right rotation, can carry out+2 ℃ adjustment with amount to 1 point of positive side ("+" side).

Adopted in the past and can not carry out the on-the-spot structure of adjusting, in the present embodiment, because under the state that the endface position of the lug boss 120 of the position of setting screw 208 and conversion element 14 is being fixed, the position of pointer 205 that can deflection indicator 204, therefore, at the scene, utilize simple tools such as screwdriver, just can adjust the deviation of reference temperature simply.

Claims (1)

1. temperature regulator, it is provided with: setting knob, this setting knob can be turned to the position corresponding with design temperature; Bolster, this bolster can move to the position corresponding with the turned position of described setting knob; Potentiometer wiper has contact element at the free end of this potentiometer wiper, and described contact element can change and potentiometric contact position according to the amount sum of the thermal expansion type temperature-swell increment of displacement conversion element and the displacement of described bolster, it is characterized in that:

Front surface at housing is provided with the pot installing plate, be provided with lid overleaf, simultaneously, described pot is fixed on the described pot installing plate, described potentiometer wiper is packed in the housing, and the braking plate that makes displacement with described bolster be passed to described potentiometer wiper remains on the inwall of described lid.

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