DE7013301U - THERMOSTATIC VALVE. - Google Patents

Description

Patent attorney RlPlL-INQ. ' BERtH ¹ Qi-D SCHMID

STUTTQART S FALB E N H E N N E N STR AS SE 17 TELEPHONE (0711) 708893

9101 +8981 B / Bn

Braukmann fittings. AG Eothrist / Switzerland

Thermostatic valve

The invention relates to a thermostatic valve with at least a throttle device and two independent sensors systems, with each heating system consisting of a heat sink, a working element and a pipe connecting the two, in particular a capillary tube, a line or the like. especially for preferably closed heating systems.

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Thermoεcatvalves of this type are known per se, and they are used everywhere where particularly high safety factors are required ) flow out hot water from a ^ in the boiler built boiler or water heater secondary side of a specific limiting temperature in Heizungskx'eislauf (primary circuit) and fübren by the inflowing cold water, the excess rated thermal safely from. by Ver ■ ending two independent J ¹ Uhl he sy star or of a self-monitoring sensor system, the process to be controlled is automatically regulated to the safe side if one of the sensor systems or the monitoring sensor system fails , for example a capillary tube or in general the failure of one of the sensor systems is displayed immediately.

There are of course a whole range of other areas of application for such '"h Opens or closes the valve, or if the self-monitoring sensor system fails, the process is automatically regulated on the safe side. In the case of a heating system, this means that if the entire filing system fails, the cold water supply is opened so that overheating and exploding of the system is definitely avoided.

In a known Themostatver.Jil of this type are two liquid expansion thermostats connected in parallel provided that act on the throttle element of the valve. The stroke movements either act parallel to the central axis of this throttle member on a lever arm or it the stroke movement of one or both thermostats is transmitted to the throttle device via an angle lever. The thermostats therefore act eccentrically with a certain lever arm on a lifting pin or cLergl., so that this is in his The longitudinal guide can easily jam and thereby the desired actuation of the throttle element does not occur. When executing with angle lever there is a risk of getting stuck less, but a lot of effort must be made there in order to achieve the desired effect, which is why this construction expensive and therefore not very economical.

The object of the present invention is now to to avoid these disadvantages of the known prior art, in particular to create a thermostatic valve of the type mentioned, that is inexpensive to manufacture, absolutely reliable and easy to assemble. To solve this problem, a Such a thermostatic valve proposed according to the invention that the working elements are connected in series and each Working element is designed for the full opening movement of the associated throttle member. If here from the assigned Throttle member is mentioned, this means that the thermostatic valve according to the invention has either one or two throttle members may have. If there is only one throttle element, both working elements are of course assigned to it, while in a version with two throttle organs

each is assigned a work element and of course, the throttling devices are connected in parallel so that the medium to be throttled or shut off can be selected about one or the other, of course, also, at the same time over both, can flow away.

In a particularly preferred embodiment of the invention, one working element has a displaceable effect on the other stored work element and the latter on the Throttle body of the valve. Provided that both sensor systems are the same, designed and capable of working, both work elements lead at the same time in the same direction and of the same size Work movements or strokes. Since at the same time one of the working elements moves the other with it, the throttle element is activated the sum of both working strokes is effective. If one of the working elements fails, in order to release the same cross-section, the working element that has remained intact can complete the double stroke. For this reason it is also necessary that each Working element alone is able to effect the full stroke of the throttle body.

The valve is in a manner known per se as a straight-way valve and the valve disc, valve cone or the like. Can be opened against the force of a return spring. Unless the throttle organ is positively connected to the working element during opening and closing, the return spring can be omitted.

Another variant of the invention consists in that the valve is connected in parallel to two independently movable Has throttle elements and each of these throttle elements is connected to a working element. Normally both will be

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Throttle elements open and closed at the same time and the effective flow cross-section is determined by the opening gap of both throttle elements. If one of them fails Sensor system must be used to achieve the same throttling effect the throttle member assigned to the remaining working element perform the double stroke. The throttle elements are preferably arranged coaxially and facing each other. Directions can be opened against the force of a closing spring, the Arbextselemente having opposite working directions. Each working element is expedient Connected to its throttle body via a plunger and, in addition, every plunger does not penetrate it associated throttle body sealing. In this way, a reversal of movement of the plunger is avoided and thus can the devices otherwise required for reversing movement are not required. Of course, care must be taken that the friction on the passage parts of the throttle member is less than the sealing force acting in the opposite direction for the throttle device concerned.

Another preferred embodiment of the invention is characterized in that the one throttle member as the main and the other are designed as a pilot valve. The functions are in this case not those of the main valve and the pilot valve, since both sensor systems are functioning properly both throttle organs are opened or closed at the same time. Since, however, one of the two throttle organs is pressed against a valve seat arranged on the other throttle element, was here in a manner analogous to that for valves common terminology of main and pilot valve

spoke. So these words are not in the conventional., h but to be understood in the sense explained above. There

II the diameters of the two throttle organs differ

I need to achieve the same opening cross-sections

ν the assigned work elements with different strokes

f perform the same temperature change. Unless one is indifferent

icae accepts changes in the cross-section of the throttle organs, can of course both Ixihlerorgane and in particular I both work elements are interpreted the same · To achieve

! the full required opening, however, must then

f a working element assigned to the pilot valve

i perform a larger Eub than actuate the main control valve

} ing element. It is also important to have ¹ ^ i of this version,

\ that each of the throttle organs alone has the full required

} Can release cross-section.

; The main and pilot valves are according to another

] Feature of the invention in each case against the force of a return

ί can be opened by a spring, with each of the main valve in the valve

valve housing and that of the pilot valve on the main valve or a member connected to it. Here, too, applies' * again that the return springs are dispensable if the

; Links between the work are em ent and their assigned Throttle organs can transmit tensile and compressive forces. If necessary, in the latter J? All every work element- ment be provided with a return spring, provided that it is not a return movement solely through a reduced pressure inside performs. This also applies to the design described above.

In a further embodiment of the invention, the main control valve is Slidably guided on the plunger of the pilot valve, with a guide sleeve over struts or arms with the valve disc or the like of the main control valve connected is. These struts or arms should allow the medium that has flowed through the pilot valve to flow away.

In the case of a thermostatic valve with two throttling elements and at least one of a sensing element, a working element as well as a sensor system that connects the two lines, in particular for preferably closed heating systems, the valve according to the invention has two parallel-connected Throttle organs and is a connected to the working element plunger with these throttling organs coupled so that each one is closed as well as one when it moves and the other when it moves back is opened and, in addition, each throttle element rests against a return spring. This is a self monitoring sensor system. In the normal case, i.e. with a completely intact sensor system, the temperature range remains too red for the entire temperature range one throttle element is always closed, while the other is open to a greater or lesser extent as required will. In the event of a defect in the sensor system, for example In the event of a break in the connection line between the working element and the sensor element or if the working element or sensor element leaks, the normally working throttle element remains closed, while the throttle element, which is closed in normal operation, is transferred to its open position. It is of course no longer possible to regulate the process, but the process becomes safe

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Side regulated. Requirement for this safety device is that the work item for the whole | The control range is under pressure when a of the parts forming the sensor system escapes and that Working element or its reciprocating piston or the like. Moves against the usual working direction. It is also important nor that in the event of a failure of the sensor system on the normally closed throttle body attacks a corresponding opening force. For this purpose one can choose between this The throttle element and the working element provide a coupling device which becomes effective at the moment when the working element or its plunger executes a movement directed against the usual working movement. It is also conceivable that on the throttle body in question when the sensor system is intact two oppositely directed, unequal forces act, whereby it is due to the difference of these forces in the closed Position is held and that if the sensor system fails, the greater force is omitted and the smaller one brings about the opening movement. The ram wanders through in a particularly advantageous way Way between the opening movement of one and the other throttle body. This prevents that the normally not operated throttle element opens immediately when the value falls below the lower level. The bigger this freewheeling distance is selected, the greater the difference between the lower control value and the response value for the throttle device, which is usually not actuated.

The two throttle organs are in a further development of the invention arranged in alignment, i.e. they are one behind the other as seen in the working direction of the working element, and are also

they can be opened in opposite directions and moreover the plunger penetrates the throttle element facing the working element in a sealing manner. Again, it should be noted that that with a movement of the working element which runs counter to the pressing movement of the last-mentioned throttle element or ram the frictional force on the passage parts through the throttle body whose contact pressure must not exceed. Between the throttle body turned away from the working element as well as a support member connected to the plunger located between the two throttle elements is in a further development of the In accordance with the invention, a compression spring is arranged. It causes the normally closed valve to open if the sensor system fails. Since this spring is also supported on the normally working throttle body, must. the power of this spring and the return spring are each chosen so that the normally working throttle body is closed, whose return spring absorb the reaction force of the safety spring can and the usually closed throttle body is fully opened.

The working element is preferably boiling at a low temperature which is in the region of zero LIQUID FILLED. Of course, this is not about absolute zero, but about the value 0 ° C. It is there thought that such a liquid is used, the vapor pressure of which, even at + 5 ° C Hech, is so great that it normally does can keep the closed throttle device in this closed position * Only when the pressure has escaped as a result If there is a defect in the sensor system, the latter should be opened «It should also be noted that the stated value of + 5 °

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in connection with heating systems is important. It must namely avoided that the! safety device at extremely low temperatures, for example when the Boiler is shut down, responds unintentionally.

Another feature of the invention is characterized in that the working element consists in a known manner of a bellows with attached base and cover and is filled with a medium that generates pressure when heated and has a connection for the lines to the iXihlkörper and that inn ^ α on the bottom and / or cover an extending in or counter ^dex% extension direction of the bellows distance is angeora.net tee. The latter is intended to prevent damage to the bellows, i.e. its complete compression.

In a further embodiment of the invention, both heat sinks are extended from one another in a common immersion sleeve housed. The immersion sleeve can be kept very short if steam pressure thermostats are used instead of liquid damping thermostats used.

The drawing shows various examples of the Invention shown in longitudinal section.

Fig. 1 shows a normal straight-way valve with a valve housing 1, a valve seat 2 as well as a throttle device which » nenden valve disk 5. The latter is via a return spring 4-in a cup-shaped extension of the housing supported. For promotion the reset spring 4 is the valve seat 2 with a sleeve provided, which is sealed against the housing via an O-bing j » is.

70133Ö1U9.70

In a cylindrical housing. ^ = At ζ 7 two Arbeitpelemente 9 ₅ 10 are arranged in an extension of one another, the is connected via a capillary tube 11 or 12 with a heat sink 15 or 14. The two sensing elements are placed in an immersion sleeve 15 · The latter can be screwed to a tank, a line or the like.

The two working elements 9, 10 consist of a bellows 16 with an attached base 17 and cover 18. Inside between the bellows of the sensing element and the capillary tube connecting these two parts there is an expansion fluid, an expansion material or a pressurized one Gas. There is also the possibility of providing a liquid with a vapor cushion above it. For the passage of the filling medium from the capillary tube 11, 12 into the working element 9, 10 is an overflow channel in the bottom 17 of each working element 19 provided. In addition, there is a spacer 20 inside each working element, which is a complete Compression and thus damage to the bellows 16 is prevented.

The bottom of the working element 9 is supported on the cover of the working element 10. In addition, the working element 9 is longitudinally displaceable in the cylindrical housing extension 7. The expansion of both working elements 9, 10 causes a displacement of the plunger 22 in the direction of arrow 21. The individual expansions of the working elements add up to the total displacement of the plunger 22. The latter rests against the throttle element, so that its displacement in the direction of arrow 21 opens the valve has the consequence. The plunger 22 is sealed by an O-inlet 23 in the housing. The compression spring M- thus

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probably the valve disk 3 as well as the atossei 22 back. In addition, a constant pressure force is exerted on the working elements by this spring when the throttle element 3 is open 9 and 10 exercised.

That in S ¹ Xg. 2 is equipped with two throttling devices or VentilteHera 24, 25 connected in parallel. Each is pressed against its valve seat 28 and 29 by a compression spring 26 or 27, respectively. The two sensor devices are constructed in the same way from a sensor body 13, 14, a working element 30, 31 and a capillary tube 11, 12 connecting these two elements. A special feature that should be mentioned here is that the tappets 32, 33, which transmit the working stroke of the working elements 30, 31 to the associated throttle elements 24, 25, each sealingly penetrate a bore 3 ^ or 35 of the unassigned throttle element. For the sake of clarity, the seal is not shown, but here too, as in the case of the sleeves 36, 37, oil valve disks or throttle elements 24, 25, an O-ring will be provided. The seals of these sleeves are denoted by 38 and 39, respectively.

In normal operation, i.e. in the event that both sensor elements are working, when the temperature rises both throttle elements 24, 25 open. Their stroke is the same with the same design of all elements involved. One falls If the sensor systems are off, the other one takes over the control alone. In order to achieve the same opening cross-section, the remaining working element must in turn be doubled Run a hub. With this valve, too, the failure of a sensor system can be indicated optically or acoustically.

70133oYi7.9.7o

That _ y? Y. 3 valve shown is also with two Throttle organs 40, 41 are provided. The throttle element 41 works with a valve seat 43 inserted in the housing 42 together, while the throttle element 40 is attached to a valve seat which is fastened in the throttle element 41 or is formed thereon 44 is present. The construction, but not the mode of operation, the throttle members 40 and 41 were therefore as Designated pilot or main control valve. With normally working work elements 30 and 31 that is, both throttle organs open 40, 41 at the same time, which is why there can be no problem with a feedforward control in the conventional sense. In addition, will in the event that the working element 30 or the corresponding The sensor system fails, the throttle element 40 is not opened at all, so that there is no taxation from this side either is present. In the event of failure, the working element 30 and a temperature increase Only the throttle element lifts to the feeler 13-14 41 from its seat 43. Ss is displaced in the direction of arrow 46 against the force of the reset spring 45.

The ram for connecting the working elements 30 and 31 with their throttling devices 41 and 40 are in turn 32 and 33, respectively designated. On the latter, the throttle member 41 is guided displaceably via a sleeve 47. The sleeve is on the free The ends of the struts 48 which form a basket and extend from the throttle element 41 are attached. The latter form passage slots for the medium that has flowed out via the open throttle element 40 through the central bore 49 of the throttle element 41.

Between the plunger 32 and the throttle member 41 is a pot-shaped Guide piece 50 for the throttle element 40 and its return spring 51 are arranged. Ee is with slits or openings

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£ about $ 2 pass by softening the medium

f: throttle member 40 can flow through. To seal the

I ram 32, 33 opposite the working elements 30, 31

f, receiving housing projections 53 »54 are used by 0 — rings 55, 56.

f? The operation of this valve is analogous to that of the

ψ. Valve of FIG. 2.

Another variant of the invention is shown in FIG. There is only one sensor element 57 there, which is in an immersion sleeve 58 and via a capillary pipe 59 is connected to the working element 60. LAz-I This is in the same way as with the other valves.

I built. When the sensor head heats up. ^r .- :: ° the ar-

I work element also from and presses the plunger 61 in calibration.

I direction of the arrow 62 upwards. The free end 63 of the plunger

I 61 presses against the throttle member 64 and lifts it from his

Housing seat 65. A return spring 66 and a guide sleeve 67 are again provided, the latter also being provided is in turn sealed by an O-ring 68 with respect to the housing.

The valve also possesses a second valve disk, i.e. a second throttle element 69, which is arranged concentrically to the other throttle element ^{in a manner analogous to the A 1 IS guides in FIGS} this moves.

f The throttle member 69 is by means of a spring 70, which

I is supported on a shoulder 71 of the plug 61 against its valve

I tilsitz 72 pressed. Between the two throttle organs 64,

% a third spring 73 is used, one end of which is on

jf throttle member 64 and the other end is at a collar 74 ί

of the plunger 61 is supported. In the case of this exemplary embodiment, the collar 74 is not molded on, rather it is formed by a snap ring.

This embodiment of the invention is a self-monitoring thermostatic valve. Provided the sensor system 57, 59, 60 is in cycle, the plunger 61 opens the valve seat or the throttle element depending on the temperature increase 64 more or less far. During the opening movement, all three compression springs 70, 73, 66 are tensioned. in the In the event of a failure of the sensor system, for example a break in the capillary line 59 or the bellows of the Working element 60, the pressure of the expansion medium, which is present over the entire normal control range in the sensor system and which is in the lowest control position of the spring 73, escapes maintains the balance, so that this spring now via the collar 74, the throttle member together with the plunger 61 against the Can press down in the direction of arrow 62. The spring cannot contribute to this downward movement, provided that the throttle member 64 rests on its seat 65. The same also applies to the compression spring 70, which at the throttle member adjacent collar 74 can no longer generate any movement.

In the exemplary embodiment of FIG. 3, be ^ ij sensor bodies, as mentioned, have a common housing, which consists of a drill with an intermediate floor 76. In addition, the capillary tube 11 is expediently passed through the interior of the sensor 13 in a sealing manner and with a compensating loop 77 £ *? Absorption of the thermal expansion provided. Both capillary or connecting tubes 11, 12 are preferably arranged in a common protective tube.

All features described and shown are according to the invention essential.

70133Θ1 «47γ9.70

Claims (1)

Expectations 1. Thermostatic valve with at least one throttle element and two independent sensor systems, each Sensor system consisting of a sensor body, a working element and a pipe connecting the two, in particular a capillary pipe, a line or the like. exists, especially for preferably closed heating systems, characterized in that that the working elements (9,10,50,31) one behind the other are switched and each work item for the full opening movement of the associated throttle member (3, 24,25,40,41) is designed. 2. Thermostatic valve according to claim 1, characterized in that one working element (10) is displaceable on the other mounted working element (9) and the latter act on the throttle element (3) of the valve. 3. Thermostatic valve according to claim 2, characterized in that the valve is designed as a through valve and the Valve disk, cone or the like (3) can be opened against the force of a return spring (4). 4. Thermostatic valve according to claim 1, characterized in that the valve two independently movable parallel switched throttle members (24, 25) and each is connected to a working element (30, 31). 5. Thermostatic valve according to claim 4, characterized in that the throttle elements (24, 25) are arranged coaxially and in opposite directions pointing directions against the force of a closing spring (26,27) "can be opened, the working elements (30,31) have opposite working directions. G. Thermostatic valve according to. Claim 5 j characterized, gekennzeie that every work selement (3Ο »3Ό over a ram (32,53) connected to his throttle organ (24,25), is and everyone The pusher is the throttle device that is not assigned to it .. ' interspersed. 7- thermostatic valve according to claim 4 and 5> characterized in that one throttle element is the main (4-1) and the other are designed as a pilot valve (40). 8. Thermostatic valve according to claim 7 »characterized in that the main (41) and the pre-control valve (40) each against the force of a return spring ^ 4% 51) can be opened, § • whereby the spring (45) of the JL & x ^ dentils in the valve housing and that (51) of the pilot valve is supported on the main valve or a member (50) connected to it. 9- Thermostatic valve according to claim 6 and 8, characterized in that the main control valve (41) is slidably guided on the plunger (33) of the pilot valve (40), with a guide sleeve (47) via struts (48) or 1st arms the valve plate or the like. Of the main control valve (41) is connected. 10. Thermostatic valve with two throttling devices and at least one of a sensing element, a working element and both of them connecting line existing sensor system, in particular for preferably closed heating systems, characterized in that, that the valve has two throttle elements (64,69) connected in parallel and one with the working element (60) connected plunger (61) is coupled to these throttling elements in such a way that one is closed as well as with his Forward movement (62) the one (64) and with its forward movement the other (69) is opened and that each throttle member is on a return spring (66,70) is applied. - 18 - 11. Thermostatic valve according to claim 10, characterized in that the plunger (61) between the opening movement of the one (64) and the other throttle member (69) a free-running stretch! wandered through. 12. Thermostatic valve according to claim 11, characterized in that that the two throttle elements (64,69) are arranged in alignment and can be opened in opposite directions, and ' that the plunger (61) passes through the throttle element (69) facing the working element (60). 13. Thermostatic valve according to claim 12, characterized in that! a compression spring (73) is arranged between the throttle element (64) facing away from the working element (60) and a support member (74-) connected to the plunger between the two throttle elements (64,69) .U. ύ 14. Thermostatic valve according to one or more of claims i! 11 to 13, characterized in that the working element | (57) with a low, in the range of the3 zero point § is filled with the temperature of the boiling liquid. § 15. Thermostatic valve according to one or more of the preceding Claims, characterized in that the working element (9,10,30,31,60) in a known manner from a Bellows (16) with attached base (17) and cover (18) exists and is filled with a medium which generates pressure when heated and a connection (19) for the line (11,12,59) to the sensor body, and that inside on the bottom and / or cover a spacer (20) extending in or against the direction of expansion (21, 62) of the bellows is arranged. - 19, - 19 - 16. Thermo et at valve according to one or more of the claims 1 to 8 and 15 »characterized in that both sensor bodies have a common housing. 17. Thexaoetatventil according to claim 16, characterized in that the common housing consists of a tube (75) with Intermediate floor (76) consists. 18. Thermostatic valve according to claim 16 and 17 »characterized in that the connecting pipe (11) through the Hihlerraum (13) is carried out sealingly and to compensate for the Change in length due to thermal expansion a loop (77) has bent. 19 · Thermostatic valve according to claims 16 to 18, characterized in that both connecting pipes (11 and 12) are in one common protective tube are arranged.