US20160208677A1 - Thermostat housing for a thermostat of an engine cooling arrangement - Google Patents

Thermostat housing for a thermostat of an engine cooling arrangement Download PDF

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Publication number
US20160208677A1
US20160208677A1 US14/914,999 US201414914999A US2016208677A1 US 20160208677 A1 US20160208677 A1 US 20160208677A1 US 201414914999 A US201414914999 A US 201414914999A US 2016208677 A1 US2016208677 A1 US 2016208677A1
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US
United States
Prior art keywords
thermostat
fluid
coolant
sensor
housing
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.)
Abandoned
Application number
US14/914,999
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English (en)
Inventor
Dhananjaya Rao Boita
Prafulla Prakash Ghare
Karthikeyan Venkatachalam
Parth Swaroop
Mohankumar Pradeep
Senthur Pandiyan
Ramasamy Velusamy
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.)
Mahindra and Mahindra Ltd
Original Assignee
Mahindra and Mahindra Ltd
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 Mahindra and Mahindra Ltd filed Critical Mahindra and Mahindra Ltd
Publication of US20160208677A1 publication Critical patent/US20160208677A1/en
Abandoned legal-status Critical Current

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    • G—PHYSICS
    • G05—CONTROLLING; REGULATING
    • G05D—SYSTEMS FOR CONTROLLING OR REGULATING NON-ELECTRIC VARIABLES
    • G05D23/00—Control of temperature
    • G05D23/01—Control of temperature without auxiliary power
    • G05D23/02—Control of temperature without auxiliary power with sensing element expanding and contracting in response to changes of temperature
    • G05D23/021—Control of temperature without auxiliary power with sensing element expanding and contracting in response to changes of temperature the sensing element being a non-metallic solid, e.g. elastomer, paste
    • G05D23/022—Control of temperature without auxiliary power with sensing element expanding and contracting in response to changes of temperature the sensing element being a non-metallic solid, e.g. elastomer, paste the sensing element being placed within a regulating fluid flow
    • 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
    • F01P7/00—Controlling of coolant flow
    • F01P7/14—Controlling of coolant flow the coolant being liquid
    • F01P7/16—Controlling of coolant flow the coolant being liquid by thermostatic control

Definitions

  • the present disclosure relates to a cooling arrangement. More particularly, the present disclosure relates to thermostat housing for a thermostat used for detecting temperature of engine coolant used in an engine cooling arrangement.
  • An engine cooling system includes a coolant flow passage formed around a cylinder block of an engine for extracting heat generated in the engine during operation of the engine.
  • the heated coolant is then circulated to a radiator with the help of a pump for dissipating the extracted heat, wherein the heated coolant is cooled down by air-flow and the cooled coolant is circulated back to the coolant flow passage to repeat the cycle of heat extraction from the engine.
  • the flow of engine coolant to the radiator is governed based on temperature of the engine coolant detected by a thermostat. The thermostat should accurately detect the temperature of the engine coolant and allow or by-pass coolant flow to the radiator.
  • inlet controlled thermostats wherein based on the temperature of the engine coolant detected by the thermostat, the coolant from cylinder block is by-passed from a pump directing coolant to the radiator during engine warm up condition.
  • a control valve is activated and the coolant is directed via the pump that directs the coolant to the radiator.
  • the thermostat accurately detects the temperature of the engine coolant as the flow of coolant between the radiator and the engine is controlled based on the coolant temperature detected by the thermostat.
  • the accuracy of the thermostat depends upon configuration of the thermostat housing that should facilitate sufficient contact between the coolant and the thermostat, particularly, the thermostat housing should enhance coolant flow over the thermostat.
  • a variety of thermostat housing having different configuration are known in the prior art
  • the US Published Patent Application, US2012312884 discloses a thermostat device.
  • the thermostat device is provided with a casing ( 2 ) which comprises a first coolant flow path ( 2 B), a second coolant path ( 2 D), and a thermostat accommodating part communicating with the first and second coolant flow paths, a cover ( 3 ) which comprises a third coolant flow path ( 2 C) communicating with the thermostat accommodating part and covers the thermostat accommodating part, and a thermostat ( 10 ) which comprises a thermo-element ( 10 h ) that moves forward and backward according to the change of the temperature of a coolant flowing through the thermostat accommodating part.
  • the thermostat device is provided with a temperature sensor ( 20 ) which is provided to face the inside of the thermostat accommodating part and detects the temperature of the coolant.
  • a sensor mounting part ( 21 ) which is provided with the temperature sensor therein is provided integrally at the inner end of the cover, and a lead connecting part ( 25 ) which is drawn to the outside from the temperature sensor is provided integrally at the outer end of the cover
  • the U.S. Pat. No. 5,410,991 discloses coolant fill housing with integral thermostat.
  • the apparatus includes a fill housing having an inlet section, an outlet section and a fill section configured to receive a cap thereon.
  • the inlet section is formed to include a valve seat and a flange for coupling the fill housing to an engine.
  • the apparatus also includes a thermostat and means for coupling the thermostat to the flange to hold the thermostat within the inlet section beneath an outer surface of the flange.
  • the fill housing is formed to include a venturi portion located between the inlet section and the outlet section to provide a pressure drop in the fill housing as fluid flows through the fill housing.
  • the venturi portion is located adjacent the fill section to subject the fill section to the pressure drop as fluid flows through the fill housing.
  • the WIPO Published Patent Application WO2012072654 discloses a thermostat valve ( 1 ) for a cooling system of an internal combustion engine with a coolant stoppage function.
  • the thermostat valve ( 1 ) for the cooling system includes a first bypass valve element ( 31 ) and a second bypass valve element ( 6 ), a main valve element ( 30 ) to be arranged in a counterpart ( 2 ) to a connection ( 22 ) to a coolant radiator, and a cross-member ( 4 ) to be arranged between an engine outlet ( 21 ) and an engine inlet ( 20 ), which cross-member ( 4 ) forms a valve seat for the first bypass valve element ( 31 ) and the second bypass valve element ( 6 ), wherein, on its outer side, the cross-member ( 4 ) has a collar ( 41 ) which forms an axial supporting region for the counterpart ( 2 ) and which is loaded in the axial direction (I) by a compression spring ( 7 ), with the result that the collar ( 41 ) is forced in the direction of the counterpart (
  • the U.S. Pat. No. 4,653,688 discloses a choke type thermostat.
  • the choke-type thermostat is provided with a bypass valve.
  • the inventive thermostat has a pliable valve member which prevents flow to an engine coolant bypass when the thermostat is in the completely open position in regards to an engine radiator outlet. Valving of the engine coolant bypass provides maximum flow to the radiator outlet when the thermostat is in the open position. Since the engine bypass is valved off by the thermostat when the thermostat is in the open position the diameter of the engine coolant bypass may be increased therefore allowing increased flow there-through when the thermostat is in a closed position.
  • the U.S. Pat. No. 6,364,213 discloses an integrated fluid recovery reservoir and thermostat assembly.
  • the integrated fluid recovery reservoir and thermostat assembly includes a coolant reservoir housing 26 which is mounted directly to the engine 14 and which includes inlet ports 28 , 30 for receiving coolant 38 from engine 14 and an outlet flow portion or module 46 which is fluidly coupled to the radiator 18 .
  • the assembly 10 further includes a flow control module and thermostat assembly 42 which is attached to the reservoir housing 26 and which selectively and fluidly communicates with the reservoir housing 26 , with the coolant pump 20 and with the radiator 18 .
  • a thermostat valve 72 is attached to and/or within assembly 42 and cooperates with assembly 42 to selectively control the flow of the coolant 38 through the engine cooling system 10 .
  • the thermostat 72 is integrated within a fill cap 54 , which allows the system 10 to be easily filled with coolant and allows the thermostat 72 to be easily serviced or replaced.
  • none of the above mentioned prior art documents disclose any provision for profiling the flow-paths of the thermostat housing for modifying flow-path line of the coolant for facilitating sufficient contact between the coolant and the thermostat. Further, none of the above mentioned prior art documents disclose any provision for achieving coolant flow restriction for facilitating sufficient contact between the coolant and the thermostat.
  • thermostat housing for use in a cooling arrangement that facilitate sufficient contact between the coolant and the thermostat by enhancing coolant flow over the thermostat, thereby improving accuracy of the thermostat in sensing coolant temperature and resulting in efficient operation of the engine cooling system. Still further, there is a need for thermostat housing for an engine cooling arrangement that improves coolant flow path around the thermostat, thereby enhancing accuracy of the thermostat and resulting in accurate functioning of the engine cooling arrangement. Still further, there is a need for thermostat housing that provides better controllability of the engine coolant flow between the radiator and the engine and engine coolant temperature, thereby permitting engine operation even at higher coolant temperatures and resulting in less CO 2 emissions.
  • An object of the present disclosure is to provide thermostat housing for use in a cooling arrangement that facilitate sufficient contact between the coolant and the thermostat by enhancing coolant flow over the thermostat, thereby improving accuracy of the thermostat in detecting coolant temperature.
  • Another object of the present disclosure is to provide thermostat housing for use in a cooling arrangement that facilitates sufficient contact between the coolant and the thermostat, thereby resulting in efficient operation of the engine cooling system.
  • Still another object of the present disclosure is to provide thermostat housing that improves coolant flow path around the thermostat, thereby enhancing the accuracy of the thermostat which shall help to avoid the overheating of engine components, thereby leading to improved reliability.
  • Yet another object of the present disclosure is to provide thermostat housing that provides better controllability of the engine coolant flow and engine coolant temperature, thereby permitting engine operation even at higher coolant temperatures and resulting in less CO 2 emissions.
  • a sensor housing is disclosed in accordance with an embodiment of the present disclosure.
  • the sensor housing includes a body, at least one receiver, at least one fluid flow director member, at least one fluid retainer member.
  • the body defines an enclosure that receives fluid.
  • the at least one receiver is configured on the body and receives and holds at least one sensor that determines at least one pre-determined property associated with fluid directed thereto as the fluid comes in contact with the at least one sensor.
  • the at least one fluid flow director member is configured on at least one internal wall of the enclosure and defines flow path of the fluid through the enclosure so as to direct the fluid to the at least one sensor and facilitate sufficient contact between fluid and the at least one sensor to ensure precise sensing of the at least one pre-determined property associated with the fluid by the at least one sensor.
  • a housing for a thermostat of a cooling arrangement for an engine of a vehicle includes a body, a receiver cavity, at least one fluid flow director member and at least one fluid retainer member.
  • the body defines an enclosure that receives coolant fluid of the cooling arrangement after the coolant fluid has extracted heat from the engine.
  • the enclosure is in fluid communication with a pump that pumps the coolant fluid to a sink of the cooling arrangement for dissipating heat extracted by the coolant fluid from the engine.
  • the receiver cavity is configured on the body and receives and holds the thermostat that determines temperature of coolant fluid directed thereto as the coolant fluid comes in contact with the thermostat.
  • the at least one fluid flow director member is configured on at least one internal wall of the enclosure and defines flow path of the coolant fluid through the enclosure so as to direct coolant fluid to the thermostat and facilitate sufficient contact between coolant fluid and the thermostat to ensure precise sensing of temperature of coolant fluid by the thermostat.
  • the at least one fluid retainer member is configured on the body and is disposed around the thermostat and prevents the coolant fluid from directly reaching suction of the pump by bypassing of the thermostat, thereby retaining the coolant fluid in contact with the thermostat for a pre-determined time to ensure precise sensing of temperature of coolant fluid by the thermostat.
  • the at least one sensor is selected from a group consisting of pH sensor, concentration sensor and temperature sensor.
  • the at least one fluid flow director member is a profiled by-pass gallery configured on the at least one internal wall of the enclosure.
  • the at least one fluid flow director member is a flap configured on the at least one internal wall of the enclosure.
  • the at least one fluid retainer member is a flow balancer rib that is configured on a valve rest face of thermostat and is disposed around the thermostat.
  • the flow balancer rib balances coolant flow to the pump and the thermostat.
  • FIG. 1 illustrates a schematic representation of conventional thermostat housing without any provision for ensuring sufficient contact between the coolant and the thermostat, particularly, conventional thermostat housing without any profiling and flow balancer ribs in accordance with the prior art;
  • FIG. 2 illustrates a schematic representation of thermostat housing with provision for ensuring sufficient contact between the coolant and the thermostat, particularly, thermostat housing with profiled coolant by-pass gallery and flow balancer ribs in accordance with an embodiment of the present disclosure
  • FIG. 3 illustrates a schematic representation of simulation of flow path lines depicting coolant flow through the thermostat housing of FIG. 2 ;
  • FIG. 4 illustrates a 3-D representation of the profiled coolant by-pass gallery configured on the thermostat housing for enhancing contact between the coolant and the thermostat;
  • FIG. 5 a illustrates a 3-D representation of a flow balancer rib configured on the thermostat housing for enhancing contact between the coolant and the thermostat;
  • FIG. 5 b illustrates another view of the flow balancer rib of FIG. 5 a.
  • the present disclosure envisages thermostat housing for a thermostat used for detecting temperature of engine coolant used in an engine cooling arrangement. More specifically, the thermostat housing enhances contact between the coolant and the thermostat by enhancing bypass coolant flow over the thermostat, thereby improving accuracy of the thermostat in detecting coolant temperature for efficient operation of the engine cooling system.
  • the thermostat housing also provides better controllability of the engine coolant flow and engine coolant temperature, thereby permitting engine operation even at higher coolant temperatures and resulting in less CO 2 emissions.
  • FIG. 1 illustrates a schematic representation of conventional thermostat housing 10 without any provision for enhancing contact between the coolant and the thermostat, particularly, conventional thermostat housing 10 without any profiling and flow balancer ribs for improving coolant flow over the thermostat.
  • the thermostat fails to accurately detect the temperature of the engine coolant and as such the flow of coolant between the radiator and the engine is not controlled accurately.
  • the engine cooling system fails to achieve efficient cooling of the engine and the engine requires frequent maintenance. Further inefficient cooling of the engine may ultimately cause failure of the engine and the service life of the engine is drastically reduced. Accordingly for efficient operation of the engine cooling system it is necessary that the thermostat accurately detects the temperature of the engine coolant and the flow of coolant between the radiator and the engine is controlled.
  • thermostat housing 10 For achieving accurate detection of the temperature of the engine coolant by the thermostat it is necessary that there is sufficient contact between the coolant and the thermostat that can be attained by providing provisions for efficient flow of coolant over the thermostat in the thermostat housing. Further, with such configuration of conventional thermostat housing 10 , the thermostats are disposed near the radiator and isolated from the engine. Still further, with such configuration of conventional thermostat housing 10 , there is delay in thermostat opening and complete blockage of coolant flow from the radiator, thereby resulting in engine seizure due to overheating.
  • a sensor housing is disclosed in accordance with an embodiment of the present disclosure.
  • the sensor housing includes a body, at least one receiver, at least one fluid flow director member, at least one fluid retainer member.
  • the body defines an enclosure that receives fluid.
  • the at least one receiver is configured on the body and receives and holds at least one sensor that determines at least one pre-determined property associated with fluid directed thereto as the fluid comes in contact with the at least one sensor.
  • the at least one fluid flow director member is configured on at least one internal wall of the enclosure and defines flow path of the fluid through the enclosure so as to direct the fluid to the at least one sensor and facilitate sufficient contact between fluid and the at least one sensor to ensure precise sensing of the at least one pre-determined property associated with the fluid by the at least one sensor.
  • FIG. 2 illustrates a schematic representation of a thermostat housing 20 with provision for enhancing contact between the coolant and the thermostat, particularly, the thermostat housing 20 is provided with at least one fluid flow director member, particularly, at least one profiled coolant by-pass gallery 12 and at least one fluid retainer member, particularly at least one flow balancer ribs 14 configured in the thermostat housing 20 for enhancing coolant flow over the thermostat, improving accuracy of the thermostat in detecting coolant temperature for achieving efficient operation of the engine cooling system.
  • the thermostat housing 20 for a thermostat of a cooling arrangement for an engine of a vehicle is disclosed.
  • the thermostat housing 20 includes a body “B”, a receiver cavity “C”, the at least one fluid flow director member, particularly, the at least one profiled coolant by-pass gallery 12 and at least one fluid retainer member, particularly, at least one flow balancer ribs 14 .
  • the body “B” defines an enclosure that receives coolant fluid of the cooling arrangement after the coolant fluid has extracted heat from the engine (not illustrated).
  • the enclosure is in fluid communication with a pump (not illustrated) that pumps the coolant fluid to a sink, particularly, a radiator (not illustrated) of the cooling arrangement for dissipating heat extracted by the coolant fluid from the engine.
  • the receiver cavity “C” is configured on the body and receives and holds the thermostat “T” that determines temperature of coolant fluid directed thereto as the coolant fluid comes in contact with the thermostat “T”.
  • the at least one fluid flow director member, particularly, the at least one profiled coolant by-pass gallery 12 is configured on at least one internal wall of the enclosure and defines flow path of the coolant fluid through the enclosure so as to direct coolant fluid to the thermostat “T” and facilitates sufficient contact between coolant fluid and the thermostat “T” to ensure precise sensing of temperature of coolant fluid by the thermostat “T”.
  • the at least one fluid retainer member particularly, at least one flow balancer ribs 14 is configured on the body “B” and is disposed around the thermostat “T” and prevents the coolant fluid from directly reaching suction of the pump by bypassing of the thermostat “T”, thereby retaining the coolant fluid in contact with the thermostat “T” for a pre-determined time to ensure precise sensing of temperature of coolant fluid by the thermostat “T”.
  • the coolant by-pass gallery 12 modifies the flow path of the coolant flowing through the thermostat housing 20 for better contact of the coolant with the thermostat and better cooling of the thermostat.
  • FIG. 3 illustrates a schematic representation of simulation of flow path lines 16 depicting coolant flow through the thermostat housing 20 .
  • FIG. 4 illustrates a 3-D representation of the profiled coolant by-pass gallery 12 configured on the thermostat housing 20 for enhancing contact between the coolant and the thermostat, wherein the profiling 12 a configured on the housing improves the flow of the coolant over the thermostat.
  • the coolant by-pass flow from the engine block is along direction “A” illustrated in FIG. 2 and FIG. 4 . Referring to FIG.
  • the rib 14 acts as an obstruction and the coolant flow path is directed back to the thermostat “T” and the coolant is maintained in contact with the thermostat “T” for a longer period of time, thereby ensuring precise sensing of temperature of coolant fluid by the thermostat “T”.
  • the coolant by-pass gallery 12 configured on the thermostat housing 20 , the mass flow fraction of the coolant passing over the thermostat is increased, thereby improving accuracy of the thermostat.
  • the thermostat housing 20 also includes at least one flow balancer ribs 14 configured in the thermostat housing 20 for enhancing coolant flow over the thermostat, thereby further improving the accuracy of the thermostat in detecting coolant temperature for achieving efficient operation of the engine cooling system.
  • FIG. 5 a illustrates a 3-D representation of a flow balancer rib 14 configured on the thermostat housing 20 for ensuring sufficient contact between the coolant and the thermostat.
  • FIG. 5 b illustrates another view of the flow balancer rib 14 .
  • the flow balancer rib 14 is configured on the valve rest face of the thermostat and restricts the coolant flow passing directly to the suction of the coolant pump, accordingly, fraction of coolant flow passing to the coolant pump and the thermostat is balanced, thereby ensuring higher coolant flow over the thermostat and better controllability of the engine coolant flow and the engine coolant temperature.

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • General Physics & Mathematics (AREA)
  • Automation & Control Theory (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Temperature-Responsive Valves (AREA)
  • Measuring Temperature Or Quantity Of Heat (AREA)
US14/914,999 2013-08-28 2014-08-21 Thermostat housing for a thermostat of an engine cooling arrangement Abandoned US20160208677A1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
IN2811/MUM/2013 2013-08-28
IN2811MU2013 IN2013MU02811A (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html) 2013-08-28 2014-08-21
PCT/IN2014/000537 WO2015029058A2 (en) 2013-08-28 2014-08-21 Thermostat housing for a thermostat of an engine cooling arrangement

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US (1) US20160208677A1 (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html)
EP (1) EP3039262A4 (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html)
IN (1) IN2013MU02811A (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html)
WO (1) WO2015029058A2 (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html)

Cited By (1)

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US20190153927A1 (en) * 2016-06-07 2019-05-23 Nippon Thermostat Co., Ltd. Thermostat device

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WO2011135883A1 (ja) * 2010-04-27 2011-11-03 日本サーモスタット株式会社 流体制御弁装置

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US20190153927A1 (en) * 2016-06-07 2019-05-23 Nippon Thermostat Co., Ltd. Thermostat device
US10767547B2 (en) * 2016-06-07 2020-09-08 Nippon Thermostat Co., Ltd. Thermostat device

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Publication number Publication date
WO2015029058A3 (en) 2015-06-04
EP3039262A4 (en) 2017-04-26
WO2015029058A2 (en) 2015-03-05
EP3039262A2 (en) 2016-07-06
IN2013MU02811A (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html) 2015-07-03

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