EP0302770B1 - Thermokontakte mit Schnappscheibe - Google Patents
Thermokontakte mit Schnappscheibe Download PDFInfo
- Publication number
- EP0302770B1 EP0302770B1 EP19880401826 EP88401826A EP0302770B1 EP 0302770 B1 EP0302770 B1 EP 0302770B1 EP 19880401826 EP19880401826 EP 19880401826 EP 88401826 A EP88401826 A EP 88401826A EP 0302770 B1 EP0302770 B1 EP 0302770B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- piston
- spring
- temperature switch
- membrane
- switch according
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
Links
Images
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H37/00—Thermally-actuated switches
- H01H37/02—Details
- H01H37/60—Means for producing snap action
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H37/00—Thermally-actuated switches
- H01H37/02—Details
- H01H37/32—Thermally-sensitive members
- H01H37/36—Thermally-sensitive members actuated due to expansion or contraction of a fluid with or without vaporisation
- H01H37/44—Thermally-sensitive members actuated due to expansion or contraction of a fluid with or without vaporisation with piston and cylinder
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H37/00—Thermally-actuated switches
- H01H37/02—Details
- H01H37/64—Contacts
Definitions
- the invention relates to thermal switches, or temperature-sensitive contact devices, which include a wax thermostat whose piston, guided longitudinally in translation relative to the body of the thermal switch, acts by pushing, by means of a spring. helical working in compression, on a cup now and centering one of the ends of this spring and engaged in the central hole of a blistering disc which at rest has its convexity towards the piston, said hole being centered on the geometric axis of the piston and spring and the aforesaid body being provided with abutment means for limiting the rebound stroke of the spring during the cooling of the wax.
- a "blistering disc” is a disc or washer made of elastic material (in particular spring steel or other metal or metal alloy) which is slightly curved at rest and which, when subjected on its central convex part to a thrust of increasing intensity, suddenly passes from a convex shape to a slightly concave shape (if we consider the face of this disc which is subjected to said thrust) for a first determined value of this intensity, then which suddenly resumes its convex shape by elastic effect, when said thrust decreases progressively, for a second value of said intensity less than the first.
- the blistering disc used in accordance with the invention therefore changes shape under the effect of variations in the thrust which it undergoes and not directly under the effect of temperature variations, unlike bimetallic blistering washers of which an example is given. by FR-A-1,179,564.
- This known thermostat has the advantage of being able to withstand temperatures significantly higher than that which corresponds to its triggering during the rise in temperature because any movement of the piston beyond this triggering temperature simply results in an increase in the compression of the first helical spring.
- it has various drawbacks.
- the large number of its constituent parts makes it difficult to assemble and adjust and increases its cost price.
- the friction of the second helical spring on the cylindrical surface of the body which guides it introduce uncertainty about the triggering temperature when the temperature rises and the interval between the triggering temperatures respectively when the temperature rises and falls.
- the invention aims to remedy the drawbacks of known thermal contacts. It aims in particular to reduce the number of their constituent parts and, consequently, to simplify their assembly and their adjustment and to reduce their cost price. It also aims to reduce friction and / or vibration as much as possible during operation. Finally, it aims to make the construction of the thermostat more compact and lower.
- the thermal switch according to the invention is essentially characterized in that the helical spring, which is a single spring, is held and centered at the other of its ends by the movable piston.
- the cup made or coated with electrically conductive material, cooperates directly with a contact pad and is interposed with it in the electrical circuit of the thermal switch.
- a thermal switch is thus obtained which comprises only a small number of parts, which is therefore easy to assemble and adjust and whose cost price is considerably lowered.
- its single coil spring is only maintained and centered by its two ends and is therefore not exposed to friction during operation.
- the presence of a single spring makes the construction more compact and less tall.
- FR-A-2,454,173 describes a thermal switch which also only includes a small number of parts.
- this known thermal switch is provided with a helical spring
- its thermostat is not of the usual piston type, because its membrane acts on a ball, this ball being housed with very little play in a cylindrical passage of the body where the thrust coil spring.
- This spring is only held on one side, more or less well, by the spherical surface of the ball and it is free on the other side, so that the friction of the spring on the wall of the cylindrical passage is uncontrollable.
- the thermostat membrane may leak in the gap between the ball and this wall, thereby compromising the operation of the thermal switch.
- the blistering disc is no longer held by the spring, as soon as the temperature drops beyond a determined threshold, and the whole blistering disc, the ball and the spring then risk becoming the seat of significant vibrations, in particular when the thermal switch is mounted directly on the engine of a motor vehicle.
- an anti-extrusion washer is interposed between the piston and a membrane which limits the housing of the wax.
- FIGS. 1 and 2 of these drawings show in longitudinal section a thermal switch according to a first embodiment, respectively at rest and after tripping.
- FIGS 3 to 6 show, similarly to Figure 1, thermocontacts respectively conform to four other embodiments of the invention.
- thermoswitch in accordance with the invention comprises a wax thermostat 1, the piston 2 of which, guided longitudinally in translation relative to the body 3 of thermostat 1, acts by pushing, via a helical spring 4 working in compression, on a cup 5 now and centering one of the ends of this spring 4 and engaged in the central hole 6 of a blistering disc 7 which at rest has its convexity towards the piston 2.
- the hole 6 is centered on the geometric axis XX of the piston 2 and of the spring 4.
- the thermostat 1 comprises a wax 9 inside a housing limited by a relatively flat membrane 8 on which the piston 2 rests directly or indirectly, preferably by means of an anti-extrusion washer 10 .
- the body 3 is provided with abutment means 11 for limiting the rebound stroke of the spring 4 during the cooling of the wax 9.
- the spring 4 which is a single spring, is held and centered, at its end opposite to that which is received by the cup 5, by the piston 2 on which, according to the embodiments of Figures 1 to 5, the stop means 11 act directly.
- the piston 2 is advantageously provided with a flange 12 which is arranged so as to come to bear, by one of its faces, on a transverse surface 16 fixed by relative to the body 3.
- the opposite face of the collar 12 serves as a support for the spring 4 which is centered by a finger 13 integral with the piston 2 and projecting with respect to this latter face of the collar 12.
- the housing of the wax 9 is limited laterally and on the side opposite to the membrane 8 by the body 3 and by a bottom 14 made in one piece with this body 3 and the membrane 8 is pinched, on its periphery, between a shoulder of this body 3 and an attached tubular part 15 which not only serves as a guide for the piston 2 but also offers the transverse surface 16 which cooperates with the flange 12 to constitute the means stop 11.
- the housing of the wax 9 is limited laterally and on the side opposite to the membrane 8 by a cup 17 attached, for example by crimping, on the body 3.
- the membrane 8 is pinched on its periphery between the body 3, devoid of bottom, and the rim 18 of the cup 17.
- the attached tubular part 15 of the previous embodiments is replaced by a tubular element 15a, made in one piece with the body 3 and offering the aforesaid transverse surface 16.
- the cup 5 made or coated with electrically conductive material, cooperates directly with a contact pad 19 and is interposed therewith in the electrical circuit of the thermal switch.
- the thermal switch according to the invention lends itself to the production of numerous electrical circuits.
- the electrical circuit comprises two terminals 20 and 21 of which the first 20 carries the stud 19 and the second of which 21 is permanently electrically connected to the blistering disc 7 and, through it, to the cup 5.
- the electrical circuit comprises a single central terminal 22, one of the ends of which constitutes the stud 19, the return of the current taking place via the cup 5, the blistering disc 7 and body 3.
- Figure 5 differs from those of Figures 1, 2 and 4 in that the terminal 21 is not electrically connected to the cup 5 directly by the blistering disc 7 (or not only by this blistering disc 7 ) but by a flexible conductor 23, which has the advantage of allowing the passage of currents of higher intensity.
- the body 3 is preferably closed, on the side opposite to the thermostat 1, by an insulating cap 24 which is crossed by at least one of the terminals 20 to 22.
- the body 3 is provided with a threaded surface 25 which makes it possible to adapt the thermal contact in the tapped hole of a support (not shown), such as the cooling radiator of an internal combustion engine, so that the bottom 14 of the housing 3 or the attached cup 17 ( Figure 4) can be bathed by the liquid whose temperature determines the functioning of the thermal switch.
- a thermal switch is thus obtained which operates in the following manner.
- the blistering disc 7 turns its convexity towards the piston 2, as shown in FIGS. 1 and 3 to 5.
- the spring 4, by bearing on the disc 7, immobilizes the piston 2 while maintaining its flange 12 against the transverse surface 16 of the part or tubular element 15 or 15a.
- the assembly constituted by the disc 7, the cup 5, the spring 4 and the piston 2 is therefore prevented from vibrating.
- the spring 4 remains perfectly centered without being subjected to external friction, which gives excellent repeatability of the passage temperature from one position to the other.
- the use of the anti-extrusion washer 10 avoids the extrusion of the rubber from the membrane 8 around the piston 2. This extrusion would have the effect of causing thermal adjustment of the thermal switch, after a long operating time, and even complete failure. of the thermal switch by jamming the piston 2.
- the blistering disc 7 could be silver (or gold) to improve the electrical conductivity.
- the thermal switch according to the invention comprises only a limited number of parts, that is to say, in addition to those of the wax thermostat 1, the spring 4, the cup 5 and the disc. blistering 7.
- the invention is not limited to the embodiments which have been described above but encompasses the variants which are within the reach of specialists in the field and an example of which is shown in FIG. 6.
- the single spring 4 at its end remote from the cup 5 is maintained and centered by the piston 2 not directly as previously, but by a spring-carrying cap 26 which covers the tubular part 15b of the guide 15 and which has an outer rim 26a against which the spring 4 bears.
- the above abutment means are then constituted by the free end of the tubular part 15b which cooperates with the bottom of the cap 26.
Landscapes
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Thermally Actuated Switches (AREA)
- Temperature-Responsive Valves (AREA)
Claims (10)
- Thermokontakt mit einem Thermostat mit Wachs, welches an den Kolben (2) anstößt, einer longitudinalen Führung bei Translation in Bezug auf den Körper (3) des Thermokontaktes, welcher einwirkt um zu drücken, über eine dazwischenliegende helicoidalen Feder (4), die unter Druck tragend ist, bzw. druckübertragend ist, auf eine Kappe (5), die durch eines der Enden der Feder (4) gehalten und zentriert ist und mit einer zentralen Öffnung (6) mit einer Schnappscheibe (7) bzw. Tellerfeder (7) in Eingriff ist, welche in Ruhestellung ihre Konvexität bzw. Erhebung dem Kolben (2) entgegenstreckt, besagte Öffnung (6) im Zentrum der geometrischen Achse (X-X) des Kolbens (2) und der Feder (4) ist und der obengenannte Körper (3) mit Mitteln für einen Anschlag (11) bzw. die Gegenlagerung (11) versehen ist, um den Hub bei Entspannung der Feder (4) bei Abkühlung des Wachses (9) zu begrenzen,
dadurch gekennzeichnet, daß
die helicoidale Feder (4) eine einzige Feder ist, welche an ihrem anderen Ende mit dem beweglichen Kolben (2) gehalten und zentriert ist. - Thermokontakt nach Anspruch 1,
dadurch gekennzeichnet, daß
die Kappe (5) aus elektrischer, leitfähiger Materie besteht oder damit beschichtet ist, direkt mit einer Anschlag- oder Kontaktstelle des Kontaktes (19) zusammenwirkt und mit dieser die elektrische Schaltung des Thermokontakes einschaltbar ist. - Thermokontakt nach einem der Ansprüche 1 und 2,
dadurch gekennzeichnet, daß
der Thermostat mit Wache ein Wachs (9) in dem Inneren von einer durch eine Membran (8) begrenzten Behausung enthält. - Thermokontakt nach einem der Ansprüche 1 bis 3,
dadurch gekennzeichnet, daß
die Mittel für einen Anschlag (11) bzw. für die Gegenlagerung (11) direkt auf den Kolben (2) einwirken. - Thermokontakt nach Anspruch 4,
dadurch gekennzeichnet, daß
der Kolben (2) mit einem Kragen (12) versehen ist, der in einer weise angeordnet ist, um ein Lager oder eine Abstützung zu ergeben mit einer seiner Flächen gegenüber einer transversalen Fläche (16), welche fest in Bezug auf den Körper (3) ist. - Thermokontakt nach Anspruch 5,
dadurch gekennzeichnet, daß
die gegenüberliegende Fläche des Kragens (11) ein Lager oder eine Abstützung für die Feder (4) bildet, welche durch einen Bolzen (3), der aus einem Stück des Kolbens (2) besteht, und durch einen Vorsprung in Bezug auf die äußere Fläche des Kragens (12) zentriert ist. - Thermokontakt nach einem der Ansprüche 3 und 5,
dadurch gekennzeichnet, daß
die Behausung des Wachses (9) lateral und auf der der Membran (8) gegenüberliegenden Seite durch den Körper (3) und einen Boden (14) begrenzt ist, der aus einem einzigen Stück mit dem Körper (3) besteht, und daß die Membran (8) in einem Umfangsbereich unter einer Schulter des Körpers (3) und einem röhrenförmigen eingesetzten Stück (15) eingeklemmt ist, welches nicht nur die Führung für den Kolben (2) bildet, sondern darüberhinaus die tansversale Oberfläche (16) aufweist, die mit dem Kragen (12) zusammenwirkt, um die Mittel für einen Anschlag (11) oder ein Gegenlager (11) auszubilden. - Thermokontakt nach einem der Ansprüche 3 und 5,
dadurch gekennzeichnet, daß
die Behausung des Wachses (9) lateral und zur gegenüberliegenden Seite der Membran (8) durch eine zweite, in den Körper (3) eingesetzte Kappe (17) begrenzt ist und daß die Membran (8) zwischen einem Umfangsbereich des Körper (3), ohne den Boden, und dem umgebogenen Rand (18) der zweiten Kappe (17) eingeklemmt ist und daß die obengenannte transvserale Fläche (16) durch ein röhrenförmiges Element (15a) gebildet ist, welches ein Stück mit dem Körper (3) bildet und als Führung für den Kolben (2) dient. - Thermokontakt nach einem der Ansprüche 1 bis 3,
dadurch gekennzeichent, daß
die Feder (4) durch den Kolben (2) mit der Zwischenlage einer federtragenden Kappe bzw. Schutzkappe (26) gehalten und zentriert ist, welche ein röhrenförmiges eingesetztes Stück (15) bedeckt, das die Führung für den Kolben (2) bildet und das die Membran (8) mit seinem Umfangsbereich gegen eine Schulter des Körpers (3) einklemmt und wobei die Mittel für einen Anschlag (11) oder ein Gegenlager (11) ein freies Vorzugsende des röhrenförmigen Stückes (15) ausbilden, welches gegen die federtragende Kappe (26) wirkt. - Thermokontakt nach einem der Ansprüche 3 bis 9,
dadurch gekennzeichnet, daß
eine extrudierungshindernde Unterlegscheibe (10) zwischen den Kolben (2) und die Membran (8) gelegt ist.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR8710677A FR2618940B1 (fr) | 1987-07-28 | 1987-07-28 | Perfectionnements aux thermocontacts a disque cloquant |
FR8710677 | 1987-07-28 |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0302770A1 EP0302770A1 (de) | 1989-02-08 |
EP0302770B1 true EP0302770B1 (de) | 1992-10-07 |
Family
ID=9353641
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP19880401826 Expired - Lifetime EP0302770B1 (de) | 1987-07-28 | 1988-07-13 | Thermokontakte mit Schnappscheibe |
Country Status (4)
Country | Link |
---|---|
EP (1) | EP0302770B1 (de) |
DE (1) | DE3875186T2 (de) |
ES (1) | ES2034318T3 (de) |
FR (1) | FR2618940B1 (de) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US6119947A (en) * | 1999-01-05 | 2000-09-19 | Symmons Industries, Inc. | Tempered water mixing system |
Families Citing this family (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE19627969A1 (de) * | 1996-07-11 | 1998-01-15 | Ego Elektro Geraetebau Gmbh | Temperaturschalter, insbesondere einstellbarer Temperaturregler |
DE19824871A1 (de) * | 1998-06-04 | 1999-12-09 | Ego Elektro Geraetebau Gmbh | Temperaturschalter, insbesondere einstellbarer Temperaturregler |
CN104078280B (zh) * | 2013-03-27 | 2016-05-11 | 比亚迪股份有限公司 | 一种电路保护器 |
CN113241286B (zh) * | 2021-07-12 | 2021-10-22 | 广东电网有限责任公司东莞供电局 | 一种自动化设备超温自动断电保护装置 |
Family Cites Families (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3735314A (en) * | 1972-06-26 | 1973-05-22 | Y Onishi | Thermo-switch for temperature control |
DE7431636U (de) * | 1974-09-20 | 1980-03-13 | Behr-Thomson Dehnstoffregler Gmbh, 7014 Kornwestheim | Schaltgerät |
US4262274A (en) * | 1979-04-13 | 1981-04-14 | General Motors Corporation | Thermal electric switch |
JPS5774928A (en) * | 1980-10-25 | 1982-05-11 | Kazumi Ubukata | Contact mechanism for temperature switch with thermal expansion material |
DE3326680A1 (de) * | 1983-07-23 | 1985-01-31 | Robert Scheuffele GmbH & Co KG, 7120 Bietigheim-Bissingen | Druckschalter |
FR2585768B1 (fr) * | 1985-08-01 | 1989-07-07 | Vernet Procedes | Dispositif sensible a la fois a la temperature et a la pression, applicable notamment a l'alerte ou a la securite dans les circuits de refroidissement scelles |
-
1987
- 1987-07-28 FR FR8710677A patent/FR2618940B1/fr not_active Expired - Fee Related
-
1988
- 1988-07-13 ES ES88401826T patent/ES2034318T3/es not_active Expired - Lifetime
- 1988-07-13 EP EP19880401826 patent/EP0302770B1/de not_active Expired - Lifetime
- 1988-07-13 DE DE19883875186 patent/DE3875186T2/de not_active Expired - Fee Related
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US6119947A (en) * | 1999-01-05 | 2000-09-19 | Symmons Industries, Inc. | Tempered water mixing system |
Also Published As
Publication number | Publication date |
---|---|
DE3875186D1 (de) | 1992-11-12 |
FR2618940A1 (fr) | 1989-02-03 |
FR2618940B1 (fr) | 1995-06-02 |
DE3875186T2 (de) | 1993-04-29 |
ES2034318T3 (es) | 1993-04-01 |
EP0302770A1 (de) | 1989-02-08 |
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