EP0464377A2 - Procédé de surveillance de corrosion - Google Patents

Procédé de surveillance de corrosion Download PDF

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Publication number
EP0464377A2
EP0464377A2 EP91108962A EP91108962A EP0464377A2 EP 0464377 A2 EP0464377 A2 EP 0464377A2 EP 91108962 A EP91108962 A EP 91108962A EP 91108962 A EP91108962 A EP 91108962A EP 0464377 A2 EP0464377 A2 EP 0464377A2
Authority
EP
European Patent Office
Prior art keywords
pressure
heating
closed
monitoring
measured
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
EP91108962A
Other languages
German (de)
English (en)
Other versions
EP0464377A3 (en
EP0464377B1 (fr
Inventor
Oskar Dr.-Ing. Schatz
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.)
Individual
Original Assignee
Individual
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Filing date
Publication date
Application filed by Individual filed Critical Individual
Publication of EP0464377A2 publication Critical patent/EP0464377A2/fr
Publication of EP0464377A3 publication Critical patent/EP0464377A3/de
Application granted granted Critical
Publication of EP0464377B1 publication Critical patent/EP0464377B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01P—COOLING OF MACHINES OR ENGINES IN GENERAL; COOLING OF INTERNAL-COMBUSTION ENGINES
    • F01P11/00—Component parts, details, or accessories not provided for in, or of interest apart from, groups F01P1/00 - F01P9/00
    • F01P11/14—Indicating devices; Other safety devices
    • F01P11/18—Indicating devices; Other safety devices concerning coolant pressure, coolant flow, or liquid-coolant level
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01P—COOLING OF MACHINES OR ENGINES IN GENERAL; COOLING OF INTERNAL-COMBUSTION ENGINES
    • F01P11/00—Component parts, details, or accessories not provided for in, or of interest apart from, groups F01P1/00 - F01P9/00
    • F01P11/06—Cleaning; Combating corrosion
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01P—COOLING OF MACHINES OR ENGINES IN GENERAL; COOLING OF INTERNAL-COMBUSTION ENGINES
    • F01P11/00—Component parts, details, or accessories not provided for in, or of interest apart from, groups F01P1/00 - F01P9/00
    • F01P11/06—Cleaning; Combating corrosion
    • F01P2011/066—Combating corrosion
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01P—COOLING OF MACHINES OR ENGINES IN GENERAL; COOLING OF INTERNAL-COMBUSTION ENGINES
    • F01P2025/00—Measuring
    • F01P2025/04—Pressure
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01P—COOLING OF MACHINES OR ENGINES IN GENERAL; COOLING OF INTERNAL-COMBUSTION ENGINES
    • F01P2025/00—Measuring
    • F01P2025/08—Temperature
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01P—COOLING OF MACHINES OR ENGINES IN GENERAL; COOLING OF INTERNAL-COMBUSTION ENGINES
    • F01P3/00—Liquid cooling
    • F01P3/22—Liquid cooling characterised by evaporation and condensation of coolant in closed cycles; characterised by the coolant reaching higher temperatures than normal atmospheric boiling-point
    • F01P3/2207—Liquid cooling characterised by evaporation and condensation of coolant in closed cycles; characterised by the coolant reaching higher temperatures than normal atmospheric boiling-point characterised by the coolant reaching temperatures higher than the normal atmospheric boiling point

Definitions

  • the invention relates to a method for monitoring corrosion in closed, in particular liquid-filled rooms, in particular in heating and cooling circuits of motor vehicles, comprising heat accumulators, and a system for carrying it out.
  • the invention is illustrated without limitation by the example of such heating and cooling circuits, which represent a preferred field of application of the invention, since it is equally suitable for use in other closed or lockable and corrosion-prone rooms, such as heat pipes or boilers.
  • the invention can be applied to all rooms at risk of corrosion, which are either essentially filled with liquid or a phase which changes, in particular between the liquid and the vapor phase Contain material or a gaseous medium with moisture content.
  • Modern heating and cooling circuits are hermetically sealed, so that under normal operating situations the circulating heat medium, which usually contains water, cannot evaporate if its temperature exceeds the boiling point.
  • a pressure relief valve is provided for extreme cases.
  • the heat transfer medium transports the heat within the engine, from engine to vehicle heating and from engine to cooling.
  • Heat stores in particular latent heat stores, are installed in such heating and cooling circuits in order to store engine heat for operating situations with a heat deficit, for example for a cold start.
  • the storage material used for storage with a high energy density is usually aggressive towards metals used in heating and cooling circuits, e.g. aluminum and copper. In the event of leakage of the storage material into the heat transfer medium, the leaked storage material can circulate and lead to corrosion, decomposition and the like, which can result in corresponding damage.
  • the solution to this problem is that the pressure is measured in a closed space and a pressure-dependent display is carried out, a display being preferably triggered when a threshold pressure is exceeded.
  • Another advantage of pressure measurement in heating and cooling circuits is that other conceivable causes for a significant increase in pressure in such heating and cooling circuits are also signs of significant damage or dangerous operating situations, such as damage to the cylinder head gasket, overheating of the engine, etc. .
  • an advantageous embodiment consists in the threshold pressure being above the vapor pressure occurring in the permissible operating range, but below the opening pressure of a pressure relief valve which may be present. It is thereby achieved that, when the display signaling that the threshold value has been exceeded, there is definitely a state outside the permissible operating range.
  • the threshold value can be 3 bar absolute.
  • a preferred embodiment of the corrosion monitoring in liquid-filled rooms is that, in addition to the pressure, the temperature of the liquid is measured and the display is suppressed when the liquid temperature is at the boiling point reached or exceeded.
  • the closed room to be monitored is generally essentially pressure-free, so that a pressure increase of 0.5 bar is a clear indication of a malfunction, e.g. corrosion or a leak in the The cylinder head of an engine, which is why in this embodiment, a relatively sensitive monitoring for corrosion takes place then suppressed.
  • the threshold pressure can preferably be 1.5 bar absolute and the display can be suppressed from an upper limit temperature of 90 ° C, so that the lower boiling temperature then does not signal even when driving over high mountain passes can trigger.
  • Yet another expedient embodiment consists in that, in addition to the pressure, the temperature is measured and the threshold pressure is changed as a function of the temperature in such a way that it is at a predetermined distance above the pressure associated with the measured temperature during trouble-free operation.
  • a further advantageous embodiment in motor vehicle heaters is that when the threshold pressure in the heating circuit is exceeded, a valve is closed and the circulation of the heat carrier through the heat accumulator is thereby prevented.
  • a closed system for carrying out the method according to the invention is designed in such a way that a small amount of easily corroding material is deposited in the system in the immediate vicinity of a possible exit area of corrosive materials to be protected.
  • the escaping, corrosive material then immediately hits this slightly corrosive material and causes an increase in pressure, which will trigger the display in the form of a warning signal before the leaking corrosive material can penetrate into the operative or sensitive areas of the system.
  • the slightly corroding material can be arranged within the store.
  • the slightly co-corroding material which is only intended for the purpose of being attacked first by the corrosive material escaping in the event of a leak and thereby causing the pressure increase triggering the warning signal, and which is therefore also referred to below as sacrificial material, is limited to a few grams and can be attached in the form of a piece of wire, for example.
  • a signal-dependent closable valve is included in the heating circuit in such a way that it is caused by the threshold pressure being exceeded occurring display signal can be closed, whereby the flow through the memory and thus the circulation of the corrosive material is prevented.
  • 10 denotes an engine with an engine circuit 12, a cooling circuit 13 and a heating circuit 14, which are referred to collectively as the heating and cooling circuit 15.
  • a cooler 16 with a cooler fan 18 is arranged in the cooling circuit 13.
  • the heat carrier emerging from the engine 10 at 20 first arrives at a thermostatically controlled three-way valve 22. If the heat carrier has not yet reached the operating temperature, the three-way valve 22 redirects it directly to a water pump 24 and feeds it back into the engine 10 at 26, which is referred to as engine circuit 12.
  • the direct connection to the water pump 24 is blocked by the three-way valve 22 and the heat transfer medium is passed through the cooler 16, from which it reaches the water pump 24 via the cooler return 28 and the connecting line 30 and again through the Motor 10 is transported.
  • An expansion tank 31 with a pressure relief valve prevents an excessive pressure rise.
  • a latent heat accumulator 40 is then included in the motor 10, the chambers of which the heat transfer medium has a corrosive material contain.
  • the heat accumulator 40 is connected via the heating flow 42 to a heating heat exchanger 44, to which a heating fan 46 is assigned, which can be adjusted according to the respective needs via a heating adjustment 48.
  • a heating return 49 leads from the heating heat exchanger 44 to the connecting line 30 and from there via the water pump 24 back to the engine 10.
  • a pressure sensor 50 and a temperature sensor 52 are assigned to the heating and cooling circuit 15, which, depending on the pressure prevailing in the heating and cooling circuit 15 and the temperature of the heat transfer medium, provide a signal to an alarm, if appropriate Deliver direction passed display unit 54 in the dashboard of the vehicle, not shown.
  • the arrangement of the two sensors 50 and 52 in the vicinity of the thermostatically controlled three-way valve 22 is chosen because the temperature sensor is usually in the vicinity of the thermostat.
  • a few grams of a sacrificial material 56 are arranged in the heat store 40, which can be, for example, a wire made of aluminum or copper with a weight of about 1 gram.
  • the storage material leaks in the heating and cooling circuit 15, corrosion occurs on corrosion-sensitive materials, which leads to the formation of gaseous hydrogen. Since the system is hermetically sealed, the formation of hydrogen causes an increase in pressure within the system, which can be measured at the pressure sensor 50. The measured value is displayed on the display unit 54, the arrangement for avoiding false indications preferably being such that a display, preferably by means of an optical and / or acoustic alarm signal, only takes place when a predetermined threshold pressure is reached or exceeded.
  • a control signal can be sent via a line 58 to a valve 60 in the heating and cooling circuit 15 in order to close this valve 60 and thereby the spread of the corrosive material into the heater - and to prevent cooling circuit.
  • a system to be checked in particular a larger or relatively complex system, can be subdivided into a number of isolated areas, each of these areas being assigned a pressure sensor.
  • partitioning is preferably carried out using shut-off valves. Such an analytical review Such a system usually has to be shut down because the foreclosure of the operating cycle is interrupted.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Testing Resistance To Weather, Investigating Materials By Mechanical Methods (AREA)
  • Preventing Corrosion Or Incrustation Of Metals (AREA)
  • Measuring Fluid Pressure (AREA)
  • Motor Or Generator Cooling System (AREA)
  • Air-Conditioning For Vehicles (AREA)
EP91108962A 1990-05-30 1991-05-31 Procédé de surveillance de corrosion Expired - Lifetime EP0464377B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE4017451A DE4017451C2 (de) 1990-05-30 1990-05-30 Verfahren zur Korrosionsüberwachung und System zu seiner Durchführung
DE4017451 1990-05-30

Publications (3)

Publication Number Publication Date
EP0464377A2 true EP0464377A2 (fr) 1992-01-08
EP0464377A3 EP0464377A3 (en) 1992-08-05
EP0464377B1 EP0464377B1 (fr) 1995-05-03

Family

ID=6407505

Family Applications (1)

Application Number Title Priority Date Filing Date
EP91108962A Expired - Lifetime EP0464377B1 (fr) 1990-05-30 1991-05-31 Procédé de surveillance de corrosion

Country Status (6)

Country Link
US (1) US5163318A (fr)
EP (1) EP0464377B1 (fr)
JP (1) JPH04231847A (fr)
CA (1) CA2043554A1 (fr)
DE (2) DE4017451C2 (fr)
ES (1) ES2071861T3 (fr)

Families Citing this family (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4345157A1 (de) * 1993-03-06 1995-04-13 Gundrum Edwin Dipl Ing Fh Sicherheits- und Kontrolleinrichtungen für die praktische Nutzanwendung befüllter Wärmespeichertaschen, ferner befüllte Wärmespeichertaschen mit einer äußeren Schutzhülle
KR100368144B1 (ko) * 1999-12-22 2003-01-24 현대자동차주식회사 자동차용 실린더 헤드 가스켓의 내구성 시험장치
JP4122731B2 (ja) * 2001-06-25 2008-07-23 トヨタ自動車株式会社 蓄熱装置を備えた内燃機関
DE102007022859B4 (de) 2007-05-15 2023-01-12 Volkswagen Ag Anordnung von in Reihe geschalteten Heizungswärmeaustauschern in einem Kraftfahrzeug
CN110082287A (zh) * 2019-06-10 2019-08-02 中石化炼化工程（集团）股份有限公司 腐蚀监测预警方法、装置及服务器
CN112485186B (zh) * 2020-11-30 2024-11-22 中国科学院金属研究所 薄液膜致轴承腐蚀的高灵敏度监测与预报警装置及方法
CN113533181B (zh) * 2021-07-06 2022-10-14 英利能源（中国）有限公司 光伏组件用于海水环境的设计试验方法及装置
CN120899524B (zh) * 2025-10-11 2026-02-03 厦门维优智能科技有限公司 一种温控阀系统及应用有该温控阀系统的空气波治疗仪

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1961826A1 (de) * 1968-12-13 1970-07-16 Hoyer William Eugene Verfahren und Einrichtung zur Bestimmung von Korrosionsbedingungen in einem fluessigen System
US4416996A (en) * 1981-08-17 1983-11-22 Texaco Inc. Hydrogen blistering corrosivity metering means and method
DE3215455C2 (de) * 1982-04-24 1986-09-04 Barlian, Reinhold, Dipl.-Ing.(FH), 6990 Bad Mergentheim Überwachungsanordnung
US4633213A (en) * 1985-05-01 1986-12-30 Borg-Warner Corporation Pressure temperature sensor
US4662232A (en) * 1985-09-26 1987-05-05 Texas Instruments Incorporated Coolant condition sensor apparatus
JPH043191Y2 (fr) * 1986-09-22 1992-01-31
DE3725165A1 (de) * 1987-07-29 1989-02-16 Schatz Oskar Waermespeicher, insbesondere latentwaermespeicher

Also Published As

Publication number Publication date
DE4017451C2 (de) 1995-04-27
EP0464377A3 (en) 1992-08-05
JPH04231847A (ja) 1992-08-20
EP0464377B1 (fr) 1995-05-03
US5163318A (en) 1992-11-17
DE4017451A1 (de) 1991-12-05
CA2043554A1 (fr) 1991-12-01
DE59105364D1 (de) 1995-06-08
ES2071861T3 (es) 1995-07-01

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