EP3702692A1 - Régulateur de pression de sécurité et chauffe-eau instantané électrique doté d'un tel régulateur de pression de sécurité - Google Patents

Régulateur de pression de sécurité et chauffe-eau instantané électrique doté d'un tel régulateur de pression de sécurité Download PDF

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Publication number
EP3702692A1
EP3702692A1 EP19160081.6A EP19160081A EP3702692A1 EP 3702692 A1 EP3702692 A1 EP 3702692A1 EP 19160081 A EP19160081 A EP 19160081A EP 3702692 A1 EP3702692 A1 EP 3702692A1
Authority
EP
European Patent Office
Prior art keywords
locking
pressure limiter
safety pressure
locking element
snap disk
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.)
Granted
Application number
EP19160081.6A
Other languages
German (de)
English (en)
Other versions
EP3702692B1 (fr
Inventor
Christian Koch
Burkhard Porr
Christian Barlag
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Gerdes Holding GmbH and Co KG
Original Assignee
Gerdes Holding GmbH and Co KG
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Gerdes Holding GmbH and Co KG filed Critical Gerdes Holding GmbH and Co KG
Priority to PL19160081T priority Critical patent/PL3702692T3/pl
Priority to EP19160081.6A priority patent/EP3702692B1/fr
Priority to PCT/EP2020/054732 priority patent/WO2020173854A1/fr
Publication of EP3702692A1 publication Critical patent/EP3702692A1/fr
Application granted granted Critical
Publication of EP3702692B1 publication Critical patent/EP3702692B1/fr
Active legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24H—FLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT-GENERATING MEANS, e.g. HEAT PUMPS, IN GENERAL
    • F24H9/00—Details
    • F24H9/20—Arrangement or mounting of control or safety devices
    • F24H9/2007—Arrangement or mounting of control or safety devices for water heaters
    • F24H9/2014—Arrangement or mounting of control or safety devices for water heaters using electrical energy supply
    • F24H9/2028—Continuous-flow heaters
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24H—FLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT-GENERATING MEANS, e.g. HEAT PUMPS, IN GENERAL
    • F24H1/00—Water heaters, e.g. boilers, continuous-flow heaters or water-storage heaters
    • F24H1/10—Continuous-flow heaters, i.e. heaters in which heat is generated only while the water is flowing, e.g. with direct contact of the water with the heating medium
    • F24H1/101—Continuous-flow heaters, i.e. heaters in which heat is generated only while the water is flowing, e.g. with direct contact of the water with the heating medium using electric energy supply
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H35/00—Switches operated by change of a physical condition
    • H01H35/24—Switches operated by change of fluid pressure, by fluid pressure waves, or by change of fluid flow
    • H01H35/34—Switches operated by change of fluid pressure, by fluid pressure waves, or by change of fluid flow actuated by diaphragm
    • H01H35/343—Switches operated by change of fluid pressure, by fluid pressure waves, or by change of fluid flow actuated by diaphragm by snap acting diaphragm
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H35/00—Switches operated by change of a physical condition
    • H01H35/24—Switches operated by change of fluid pressure, by fluid pressure waves, or by change of fluid flow
    • H01H35/38—Switches operated by change of fluid pressure, by fluid pressure waves, or by change of fluid flow actuated by piston and cylinder
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H35/00—Switches operated by change of a physical condition
    • H01H35/24—Switches operated by change of fluid pressure, by fluid pressure waves, or by change of fluid flow
    • H01H35/40—Switches operated by change of fluid pressure, by fluid pressure waves, or by change of fluid flow actuated by devices allowing continual flow of fluid, e.g. vane

Definitions

  • the present invention relates to a safety pressure limiter.
  • the invention further relates to an electrical water heater comprising at least one fluid line carrying a fluid in the form of a channel arrangement with at least one electrically heated heating channel.
  • a safety switch of a water heater with switching mechanism influenced by physical variables in the device to be protected is known, which is characterized in that a slide is actuated by an anchor bolt when the anchor bolt is driven by an electromagnetically acting coil and the anchor bolt is moved by a pressure pin of a pressure sensor .
  • safety switches which use a snap disk to actuate a switching element.
  • all of the previously known devices have the disadvantage that they are mechanically complex and therefore prone to errors. This results in particular in unwanted tripping of the safety pressure limiter, which results in incorrect shutdown of the flow heater, as well as delayed or not executed tripping of the safety pressure limiter if necessary, which can result in irreparable damage to the device.
  • the currently known safety pressure limiters claim a comparatively large installation space.
  • the known safety pressure limiters consist of several basic components, some of them from different suppliers or manufacturers, which means that there is a high susceptibility to assembly errors of the safety pressure limiter and existing tolerances of the individual basic components can result in malfunctions of the safety pressure limiter composed of the basic components.
  • the task is also to propose a safety pressure limiter that triggers precisely when a specified maximum pressure is exceeded.
  • a further object of the present invention is to propose a flow heater with such a safety pressure limiter.
  • a safety pressure limiter with the features mentioned at the beginning, wherein the safety pressure limiter comprises a pressure receiving part which is set up to be hydraulically connected to a fluid line carrying a fluid, and where the pressure receiving part has a piston element that is slidable in a longitudinal direction and one between a metastable state and a stable state comprising deformable snap disk by means of the piston element, the snap disk being transferred from the metastable state to the stable state by the piston element when a predetermined maximum pressure of the fluid is exceeded, further comprising a housing and a locking element which is arranged to be movable in the longitudinal direction and which on the side of the snap disk facing away from the fluid rests a contact set element which, for opening at least one electrical contact point, is spring-preloaded and slidably movable in a transverse direction is set up and comprises a locking recess into which the locking element engages in a locking position, provided the snap disk is in the metastable state, with at least a partial form fit and the contact
  • the safety pressure limiter according to the invention has the advantage that it always has a reliable and quick shutdown behavior when required, that is, when a predetermined maximum fluid pressure is exceeded.
  • the construction which is kept as simple as possible, has an advantageous effect, as a result of which the safety pressure limiter exhibits a precise and highly reliable triggering behavior.
  • the interaction of the piston element with the snap disk in connection with the locking element on the side of the snap disk facing away from the fluid leads, if necessary, to an immediate triggering of the shutdown process in that the change in state of the snap disk from the metastable state to the stable state, triggered by the piston element, is triggered directly and immediately the locking element is transmitted.
  • the locking element thus directly releases the contact set element so that it moves automatically from the closed position of the electrical contact point into the open position of the. Because the locking element rests directly on the snap disk, the locking element is arranged on the snap disk without play, whereby a high triggering precision of the safety pressure limiter according to the invention is achieved. In addition, this enables an overall compact design of the safety pressure limiter according to the invention.
  • a metastable state of the snap disk within the meaning of the invention means that the snap disk is stable against small changes, but unstable against larger changes; that is, if no forces or only minimal forces act on the snap disk, it retains its state; if the force is greater, the snap disk changes automatically from the metastable state to the stable state, which results in a change in the curvature of the snap disk.
  • the snap disk offers the particular advantage that the safety pressure limiter according to the invention has a defined shutdown behavior. If the force acting on the snap disk increases, it remains in the metastable state, that is, it is not deflected and the position of the locking element is not changed.
  • the snap disk is designed as a mechanical hysteresis element, which only occurs when the automatically deflects the specified magnitude of the acting force and changes to the stable state. This ensures that the locking element is clearly shifted between the locking position and the release position, but does not assume any intermediate positions in between. This ensures that the safety pressure limiter according to the invention is set up bistable, the contact set element is either in a closed or in an open position, but cannot remain in an intermediate position.
  • the safety pressure limiter further comprises an operating element which is configured to be displaceable in the longitudinal direction for resetting the locking element from the release position to the locking position, the operating element being connected to a free end of the locking element via a compression spring.
  • the snap disk resting on the locking element is preferably transferred from the stable state to the metastable state, i.e. the locking element is designed in such a way that it can convert the snap disk from the stable state to the metastable state.
  • the piston element resting on the snap disk is arranged movably in the longitudinal direction.
  • the locking element can inadvertently be returned to the locking position as long as the fluid pressure is greater than the maximum predetermined trigger pressure. If the actuating element were mechanically coupled directly to the locking element, the locking element could be reset against the fluid pressure of the STB by applying a correspondingly large restoring force to the actuating element, with the snap disk deforming back. With the compression spring arrangement according to the present According to the invention, inadmissible reconnection in the event of a trigger against the existing fluid pressure is reliably prevented.
  • the operating element comprises a resilient material, for example an elastic plastic, which connects the operating element to a free end of the locking element and forms a spring path. This further reduces the manufacturing effort and manufacturing costs.
  • a preferred development of the invention is characterized in that the operating element is arranged on the housing of the safety pressure limiter in such a way that the sliding path of the operating element is limited against the longitudinal direction. In this way, it is ensured that the operating element is only set up to be movable over a certain distance in the longitudinal direction. More preferably, the maximum free length of the sliding path is chosen so that the limitation of the sliding path engages before the compression spring is completely compressed. This prevents uncontrollable movement of the locking element in the longitudinal direction, which can damage the safety pressure limiter, in particular the individual components. In addition, the maximum restoring force acting on the free end of the locking element is limited to a maximum restoring force predetermined by the spring constant of the compression spring.
  • the force acting on the locking element reaches its maximum. If an attempt is now made to move the actuating element further against the longitudinal direction by applying an even higher force, it comes into abutment contact with the housing, whereby the force applied to the actuating element now acts - at least partially - on the housing. Overall, the maximum force acting on the locking element is thus limited, so that, regardless of the magnitude of the actuating force acting on the actuating element, undesired resetting of the safety pressure limiter is avoided in any case.
  • Another expedient embodiment of the invention is characterized in that the housing and part of the operating element have end stop surfaces to limit the sliding path.
  • the end stop surfaces thus act as a barrier to limit the sliding path within the longitudinal direction. In this way an undesired indefinable sliding movement can be prevented.
  • the end stop surfaces are variably adjustable, whereby the sliding path limitation can be adapted to the requirements of the locking element used and / or the snap disk.
  • Another useful embodiment of the invention is characterized in that the sliding path limitation is dimensioned such that the maximum sliding path of the operating element is less than the maximum spring travel of the compression spring.
  • a preferred development of the invention is characterized in that the contact set element has at least three contact points to form an all-pole three-phase switch. This offers the advantage that the safety pressure switch is suitable for multi-phase switching and is particularly suitable for operation with three-phase current.
  • Another expedient embodiment of the invention is characterized in that the piston element and / or the locking element each rests at least essentially in the center of the snap disk.
  • This offers the advantage that a defined triggering behavior of the safety pressure limiter according to the invention is guaranteed.
  • the aforementioned central arrangement has the further advantage that the greatest stroke of the snap disk occurs in this area, so that a precise change between the closed and open position of the electrical contact point is always achieved.
  • “At least essentially in the middle” in the context of the invention means in the middle or with a few mm deviations from the central positioning of the piston element and / or the locking element of the snap disk.
  • a preferred development of the invention is characterized in that the piston element and / or the locking element each rests at least essentially flush on the snap disk.
  • “flush” means being in contact with the snap disk.
  • the dimensions of the piston element and of the locking element can be optimally selected according to the maximum actuation or contact force or the contact path of the snap disk. Since the piston element and / or the locking element rests at least essentially flush on the snap disk, they are arranged on the snap disk without play, so that a high triggering precision is achieved.
  • “At least substantially flush” in the context of the invention means flush or at a distance of a few mm from the flush positioning of the piston element and / or the locking element of the snap disk.
  • Another useful embodiment of the invention is characterized in that the locking element is designed and set up in one piece. This offers the advantage that the locking element is made from one piece, so that no tolerances can arise in the case of an assembly of several components that would otherwise be required. Furthermore, an inexpensive production of the locking element is possible, for example if it is produced by an injection molding process.
  • the object is also achieved by an instantaneous water heater with the features mentioned at the outset, in that the instantaneous water heater comprises a safety pressure limiter according to the invention with the aforementioned features, the pressure receiving part being hydraulically connected to the fluid line of the channel arrangement and between the mains voltage connection and the at least one electrical heating channel and / or an operating voltage input of the water heater, the contact set is electrically interposed.
  • the safety pressure limiter in the instantaneous water heater according to the invention ensures a quick and reliable shutdown when necessary.
  • the smaller number of individual components enables the safety pressure limiter to be used in a space-saving and cost-effective manner in the instantaneous water heater.
  • Fig. 1 shows a schematic side view of the safety pressure limiter 10 according to the invention in the locking position.
  • the safety pressure limiter 10 has a pressure receiving part 11 which is set up to be connected to a fluid line 12 carrying a fluid.
  • the pressure receiving part 11 is preferably arranged in a sealing manner on the fluid line 12.
  • At least one sealing means is particularly preferably arranged on the pressure receiving part 11.
  • the pressure receiving part 11 comprises a piston element 14 which is designed to be movable in a longitudinal direction 13 and a snap disk 17.
  • the snap disk 17 is designed in such a way that it is at least substantially deformed between two states.
  • the safety pressure limiter is shown in a locking position. In the locking position, the snap disk 17 has a metastable state 15. In the Fig. 2 and Fig. 4 is the safety pressure limiter in a trigger position shown. In the release position, the snap disk 17 has a stable state 16.
  • the snap disk 17 is deformable by means of the piston element 14.
  • the piston element 14 acts on the snap disk 17 in the metastable state 15
  • the snap disk 17 deforms into the stable state 16; for this purpose, the piston element 14 moves under the action of fluid pressure in the longitudinal direction 13 in the direction of the snap disk 17, which causes the snap disk 17 to operate when a predetermined maximum pressure is exceeded Fluid is transferred from the metastable state 15 to the stable state 16.
  • the piston element 14 is preferably arranged on the fluid line 12 in such a way that the piston element 14 is in contact with the fluid.
  • the piston element 14 particularly preferably seals the safety pressure limiter 10 from the deformable snap disk 17 in such a way that the snap disk 17 does not come into contact with the fluid.
  • the safety pressure limiter 10 further comprises a housing 18.
  • the housing 18 is located on the safety pressure limiter 10 and serves on the one hand for electrical insulation and on the other hand as mechanical protection for the movable and electrical components of the safety pressure limiter according to the invention.
  • the safety pressure limiter 10 further comprises a locking element 19 which rests against the side of the snap disk 17 facing away from the fluid.
  • the locking element 19 is designed to be movable in the longitudinal direction 13.
  • the locking element 19 is preferably designed to be movable against spring preload.
  • an additional compression spring - not shown in the drawings - can be designed and set up within the safety pressure limiter.
  • the safety pressure limiter 10 comprises a contact set element 20 which is designed to be able to slide in a transverse direction 22 to open at least one electrical contact point 21.
  • the contact set element 20 further comprises a locking recess 23.
  • the contact set element 20 is spring-preloaded.
  • the locking element 19 engages the locking recess 23 with at least a partial form fit, provided that the snap disk 17 is in the metastable state 15.
  • the contact set element 20 is thus locked under spring preload in a closed position of the at least one electrical contact point 21.
  • the electrical contact points 21 are formed in the closed position and designed to conduct electrical current.
  • the locking element 19 is set up such that the locking element 19 releases the locking recess 23 when the metastable state 15 is transferred to the stable state 16 of the snap disk 17, whereby the safety pressure limiter 10 or the locking element 19 is in the release position.
  • the trigger position shown is the contact set element 20 in an open position.
  • the contact set element 20 moves automatically under spring tension in the transverse direction 22 into an open position of the at least one electrical contact point 21.
  • the electrical contact points 21 are designed in the open position and set up to conduct electrical current prevent.
  • the spring-preloaded contact set element 20 is automatically shifted in the transverse direction 22, which moves the at least one electrical contact point 21 into an open position, which when an electrical current flows through the electrical contact points 21 to a Voltage disconnection leads.
  • the safety pressure limiter 10 advantageously comprises an operating element 24 which is arranged to be displaceable in the longitudinal direction 13.
  • the operating element 24 is designed and set up to reset the locking element 19 from the release position into the locking position.
  • the operating element 24 is connected to a free end 26 of the locking element 19 via a compression spring 25.
  • the operating element 24 is arranged on the housing 18 of the safety pressure limiter 10 in such a way that the sliding path of the operating element 24 counter to the longitudinal direction 13 is limited.
  • the sliding path of the operating element 24 is due to the path that the operating element 24 can be moved in the longitudinal direction 13.
  • the limitation takes place in that at least one area of the operating element 24 adjoins the housing 18 during the movement in the longitudinal direction 13, which leads to a limitation of the further movement in the longitudinal direction 13.
  • the housing 18 and a part of the operating element 24 preferably have end stop surfaces 27 for limiting the sliding path.
  • end stop surfaces 27 for limiting the sliding path are designed and configured to be flat, but alternative end stop surfaces 27 for limiting the sliding path are also possible, for example a dagger-shaped sliding path limitation on the operating element 24 and / or the housing 18.
  • At least one region of the contact set element 20 delimits the sliding path of the operating element 24 counter to the longitudinal direction 13.
  • the sliding path limitation is preferably dimensioned such that the maximum sliding path of the operating element 24 is less than the maximum spring path of the compression spring 25.
  • the sliding path limitation is particularly preferably dimensioned in such a way that the maximum sliding path of the operating element 24, both in the locking position and in the release position, is less than the maximum spring travel of the compression spring 25.
  • the contact set element 20 of the safety pressure limiter 10 has at least three contact points 21.
  • the at least three contact points 21 are preferably used to form an all-pole three-phase switch.
  • Contact set elements 20 with fewer or more than three contact points 21 can also be implemented in an analogous manner (not shown).
  • the piston element 14 and / or the locking element 19 each lie at least essentially centrally on the snap disk 17 on.
  • the snap disk 17 is preferably a circular component, which is why at least essentially in the middle within the meaning of the invention means that the piston element 14 and / or the locking element 19 rest at least essentially at the center of the snap disk 17, i.e. with slight deviations from the center of a few mm .
  • the piston element 14 and / or the locking element 19 rests at least essentially flush on the snap disk 17 both in the locking position and in the release position.
  • the snap disk 17 preferably has a concave or convex surface on the side facing away from or facing the fluid, which is why at least substantially flush in the context of the invention means that the piston element 14 and / or the locking element 19 at least substantially lie flush against the concave or convex-shaped surface of the snap disk 17, that is to say with small deviations of a maximum of a few mm from the concave or convex-shaped surface of the snap disk 17.
  • the locking element 19 is preferably formed from a single piece, that is to say from only one component.
  • the instantaneous water heater comprising at least one fluid line 12 carrying fluid in the form of a channel arrangement 28 with at least one electrically heated heating channel - not shown in the drawings.
  • the instantaneous water heater further comprises at least one of the safety pressure limiter 10 according to the invention.
  • the pressure receiving part 11 of the safety pressure limiter 10 is hydraulically connected to the fluid line 12 of the channel arrangement 28. Furthermore, the contact set 20 of the safety pressure limiter 10 is electrically interposed between - a mains voltage connection (not shown in the drawing) and the at least one electrical heating channel and / or an operating voltage input of the water heater - not shown in the drawings.

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Fluid Mechanics (AREA)
  • Switches Operated By Changes In Physical Conditions (AREA)
EP19160081.6A 2019-02-28 2019-02-28 Régulateur de pression de sécurité et chauffe-eau instantané électrique doté d'un tel régulateur de pression de sécurité Active EP3702692B1 (fr)

Priority Applications (3)

Application Number Priority Date Filing Date Title
PL19160081T PL3702692T3 (pl) 2019-02-28 2019-02-28 Zabezpieczający ogranicznik ciśnienia oraz zawierający go elektryczny podgrzewacz przepływowy
EP19160081.6A EP3702692B1 (fr) 2019-02-28 2019-02-28 Régulateur de pression de sécurité et chauffe-eau instantané électrique doté d'un tel régulateur de pression de sécurité
PCT/EP2020/054732 WO2020173854A1 (fr) 2019-02-28 2020-02-24 Limiteur de pression de sécurité et chauffe-eau instantané électrique qui en est équipé

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP19160081.6A EP3702692B1 (fr) 2019-02-28 2019-02-28 Régulateur de pression de sécurité et chauffe-eau instantané électrique doté d'un tel régulateur de pression de sécurité

Publications (2)

Publication Number Publication Date
EP3702692A1 true EP3702692A1 (fr) 2020-09-02
EP3702692B1 EP3702692B1 (fr) 2021-09-15

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP19160081.6A Active EP3702692B1 (fr) 2019-02-28 2019-02-28 Régulateur de pression de sécurité et chauffe-eau instantané électrique doté d'un tel régulateur de pression de sécurité

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Country Link
EP (1) EP3702692B1 (fr)
PL (1) PL3702692T3 (fr)
WO (1) WO2020173854A1 (fr)

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2923216C2 (de) 1979-06-08 1984-07-26 Stiebel Eltron Gmbh & Co Kg, 3450 Holzminden Durchlauferhitzer mit einem Sicherheitsschalter
EP0501759A1 (fr) * 1991-02-26 1992-09-02 Texas Instruments Incorporated Appareil de commutation répondant à deux conditions
US5482439A (en) * 1995-01-09 1996-01-09 Chen; Chi-Wen Power breaker for a compressor for automobiles with a curved plug and wrinkled control disk
DE10104438B4 (de) 2001-02-01 2007-06-14 Stiebel Eltron Gmbh & Co. Kg Mehrpoliger Sicherheitsabschalter mit einem Drucksensor

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2923216C2 (de) 1979-06-08 1984-07-26 Stiebel Eltron Gmbh & Co Kg, 3450 Holzminden Durchlauferhitzer mit einem Sicherheitsschalter
EP0501759A1 (fr) * 1991-02-26 1992-09-02 Texas Instruments Incorporated Appareil de commutation répondant à deux conditions
US5482439A (en) * 1995-01-09 1996-01-09 Chen; Chi-Wen Power breaker for a compressor for automobiles with a curved plug and wrinkled control disk
DE10104438B4 (de) 2001-02-01 2007-06-14 Stiebel Eltron Gmbh & Co. Kg Mehrpoliger Sicherheitsabschalter mit einem Drucksensor

Also Published As

Publication number Publication date
EP3702692B1 (fr) 2021-09-15
PL3702692T3 (pl) 2022-02-14
WO2020173854A1 (fr) 2020-09-03

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