Thermostat housing for the engine liquid cooling system

Abstract

The utility model relates to mechanical engineering, to elements of liquid cooling systems for diesel generator and gas piston engines with a coolant flow control unit.In order to increase the resistance of the thermostat housing to the impact of mechanical loads during its dismantling, in the thermostat housing of the liquid cooling system of the engine with a coolant flow control unit, comprising a cylindrical part (1) with a coaxial cavity (8) for the thermostat and lateral openings (9) for coolant flows, made with the possibility of installation in the mating opening of the coolant flow control unit, and a mounting flange (2) with openings (4) for threaded fastening of the thermostat housing on the coolant flow control unit, the mounting flange (2) contains stiffening ribs (7) located on its end surface, oriented in radial directions in accordance with the axes of the openings (4) for threaded fastening of the thermostat housing on the coolant flow control unit. 2 sec. fil., 5 fig.

Description

[0001] Technical field

[0002] The utility model relates to mechanical engineering, to elements of liquid cooling systems for diesel generator and gas piston engines with a coolant flow control unit, and can be used in liquid cooling systems for internal combustion engines and in heat exchangers.

[0003] Technology Level

[0004] Diesel generator and gas piston engines are currently widely used for autonomous power generation due to their relatively high efficiency and reliability.

[0005] The key task of ensuring the stable operation of diesel generators and gas piston engines is the need to prevent them from overheating in order to extend the service life of the equipment, since the combustion temperature of diesel and gas fuel is about 800-1000 °C, and the optimal operating temperature of diesel generators and gas piston engines is 70-80 °C.

[0006] Maintaining the optimal temperature regime of diesel generator and gas piston engines is ensured by means of liquid cooling systems.

[0007] Optimal performance of liquid cooling systems of diesel generator and gas piston engines directly affects engine life, power stability, fuel consumption and accident rate.

[0008] In diesel generator engines, the liquid cooling circuit primarily removes excess heat from the cooling jacket, cylinder heads, oil and, in some designs, from the charge air cooler.

[0009] In gas piston engines, liquid cooling systems not only remove heat from the engine, but are also often used to maximum effect in cogeneration systems as a source of useful heat, for example, for hot water heating systems in residential and industrial premises.

[0010] In almost all liquid cooling systems of diesel generator and gas piston engines, the thermal regulation of coolant flows is carried out by means of thermostats - devices for automatic stabilization and maintenance of the required temperature of the separated coolant flows, which require constant monitoring of normal operation and prompt replacement if necessary.

[0011] A dual-circuit cooling system for a gas piston electric power unit engine is known, in which the inner circuit is configured to cool the engine and contains an inner circuit water pump connected to an inner circuit pressure gauge, the outer circuit is configured to cool the charge air, the inner circuit coolant and the engine lubrication system oil and contains a receiving valve, an outer circuit water pump connected to an outer circuit check valve, a charge air cooler, a water-oil cooler, a water-water cooler, a temperature controller (i.e.thermostat), designed with the possibility of dividing the flows and, depending on the temperature of the coolant of the inner circuit, redirecting part of the coolant flow through the outer cooling circuit to the pump of the inner cooling circuit, wherein the circulation of the coolant of the inner circuit is performed by the water pump of the inner circuit through the line supplying the coolant to the engine through separate pipes, and the coolant of the outer circuit is supplied by means of the water pump of the outer circuit through the intake valve, taking water from the water supply source and directing it through the check valve to the charge air cooler, through the water-oil cooler it enters the water-water cooler, from which it returns back to the water supply source [RU 2801682 F01P 3 / 20, F01P 7 / 14. Published 14.08.2023 Bulletin No. 23].

[0012] A known diagram of an engine cooling system contains a small coolant circulation circle, including a water pump, a cylinder block, a cylinder head, a thermostat, and a large circle, including a water pump, a cylinder block, a cylinder head, a thermostat, and a radiator, characterized in that a hydraulic turbine with a fan, mounted on the same shaft, is connected between the thermostat and the radiator [RU 2214524 F01P 7 / 14. Published 20.10.2003 Bulletin No. 29].

[0013] A known thermostat for an internal combustion engine cooling system comprises a housing with a partition forming two chambers connected by a bypass opening. One of the chambers—the engine coolant inlet chamber—has a coolant outlet pipe to the radiator and an outlet pipe to the interior heater circuit, connected to a starting aid circuit. The second chamber—the engine coolant outlet chamber—has a coolant inlet pipe from the radiator. A thermal element, i.e., a thermostat with a main and bypass valve, is installed within the chamber. A check valve, a freely movable cup, is mounted within the bypass opening. On the outlet chamber side, the cup is equipped with a flange. A centered spring is mounted within the cup, the other side of which is fitted onto the end of the bypass valve axle.Bypass channels are provided around the bypass hole in the bulkhead, closed by a flange under the action of a compressed spring. This increases the efficiency of the thermostat when installed in the cooling system of an internal combustion engine and facilitates engine starting by blocking the flow of heated fluid through the thermostat when warming up a non-running engine [RU 2202046 F01P 7 / 16 Published 10.04.2003 Bulletin No. 10].

[0014] A thermostat housing is known, comprising a base and a cover, which are bolted together with flanges and have cylindrical surfaces. The base is provided with a flange with a groove for a sealing ring. This flange is used for connection to the flange of the manifold of the water cooling system of an internal combustion engine. One of the parts may also contain a branch pipe for connection to the expansion tank of the aforementioned cooling system [RU 2202046 F01P 7 / 16, published 2003.04.10 Bulletin No. 10].

[0015] The closest in technical essence and achievable technical result (prototype) is the thermostat housing 4011294 of the liquid cooling system of the Cummins QSV91 engine with a power of up to 3,000 kW, which is a cast iron housing with a cylindrical seat with an internal cavity for accommodating a thermostat and a mounting flange with fastening holes, manufactured with the possibility of hermetically sealed installation in the corresponding hole of the coolant flow control unit of the cooling system and subsequent threaded fastening of the thermostat housing with bolts on the specified block [Cummins QSV91 Engine Parts Catalog, p. 74, 2000-2011 Cummins Inc., Box 3005, Columbus, IN 47202-3005 USA (prototype)].

[0016] The disadvantage of this design of the thermostat housing (according to the prototype) is the unsatisfactory resistance of the flange part of the thermostat housing to mechanical loads that arise when it is dismantled from the mating hole of the temperature and coolant flow volume control unit, especially in areas of the mounting flange that are weakened by the mounting holes.

[0017] Technical problem and technical result.

[0018] Thermostats in liquid cooling systems of powerful diesel generators or gas piston engines are usually placed in thermostat housings, mainly of cylindrical shape, which are hermetically installed in mating holes of separately located units for regulating the temperature and volume of coolant flows, which in liquid cooling systems of powerful engines amount to 80 m3 or more. 3 / h.

[0019] Due to the tight, sealed installation of the cylindrical part of the thermostat housing in the mating hole of the coolant flow control unit and the high temperature of the coolant coming from the engine and passing through the thermostat and the thermostat housing during engine operation, the outer surfaces of the cylindrical part of the thermostat housing “stick” to the walls of the mating hole of the coolant flow control unit.

[0020] If it is necessary to replace or repair the thermostat, the thermostat housing together with the thermostat located in it must be removed from the mating hole of the coolant flow control unit. For this purpose, during dismantling, significant mechanical dismantling forces must be applied to the flange part of the thermostat housing, as a result of which significant mechanical stresses arise in the flange part of the thermostat housing, often leading to the formation of cracks and destruction of the thermostat housing, which is due to the insufficient strength of the flange part of the thermostat housing according to the prototype and its insufficient resistance to the effects of mechanical dismantling loads.

[0021] This is due to the fact that when removing the thermostat housing together with the thermostat located in it from the mating hole of the cooled liquid flow control unit, the mechanical dismantling forces are transferred to the sections of the mounting flange weakened by the fastening holes, which are not structurally designed to compensate for the often significant mechanical loads that lead to damage to the thermostat housing when dismantling the thermostat housing together with the thermostat located in it in cases where it is necessary to replace or repair the thermostat, either scheduled or emergency.

[0022] The technical result of the utility model is to increase the resistance of the thermostat housing to mechanical loads during its dismantling.

[0023] The resistance of the thermostat housing to mechanical loads in accordance with GOST 17516.1-90 and GOST 30631-99 within the framework of this application is understood to mean the ability of the thermostat housing to maintain its integrity and its parameters within the limits established in the technical specifications, standards and technical conditions of the norms during and / or after exposure to mechanical loads during its dismantling, that is, during and / or after its removal from the mating hole of the coolant flow control unit if it is necessary to replace or repair the thermostat.

[0024] The essence of the utility model

[0025] The technical result is achieved in that the thermostat housing of the engine liquid cooling system with a coolant flow control unit containing

[0026] a cylindrical part (1) with a coaxial cavity (8) for a thermostat and side openings (9) for coolant flows, designed with the possibility of installation in a mating opening of a coolant flow control unit,

[0027] and a mounting flange (2) with holes (4) for threaded fastening of the thermostat housing to the coolant flow control unit,

[0028] according to the utility model

[0029] The mounting flange (2) contains stiffening ribs (5) located on its end surface, oriented in radial directions in accordance with the axes of the holes (4) for threaded fastening of the thermostat housing to the coolant flow control unit.

[0030] In this case, the thermostat housing may additionally contain recesses (7) for a dismantling tool located on the side surface of the mounting flange (2) on the side of its mating surface (6), located in the spaces between the holes (4) for threaded fastening of the thermostat housing to the coolant flow control unit.

[0031] Brief description of drawings

[0032] The utility model is illustrated by drawings in which the following items are shown by position numbers:

[0033] 1 - cylindrical part of thermostat housing;

[0034] 2 - thermostat housing mounting flange;

[0035] 3 - a central hole in the mounting flange, providing access to the internal cavity of the housing during assembly, maintenance or monitoring of the condition of the thermostat installed in the thermostat housing, closed with a threaded plug when the engine is running to maintain the tightness of the cooled liquid circulation circuit;

[0036] 4 - holes located peripherally on the mounting flange for threaded fastening of the thermostat housing to the coolant flow control unit;

[0037] 5 - stiffening ribs on the end surface of the mounting flange;

[0038] 6 - ​​mating surface of the mounting flange, the contact surface of the mounting flange with the surface of the coolant flow control unit after installing the thermostat housing with the thermostat located inside it in the mating hole of the coolant flow control unit;

[0039] 7 - recesses for the dismantling tool on the side surface of the mounting flange from the side of its mating surface;

[0040] 8 - a cavity coaxially located inside the cylindrical part of the thermostat housing for placing the thermostat in it;

[0041] 9 - side holes in the cylindrical part of the thermostat housing for adjustable coolant flows;

[0042] 10 - internal annular stop for axial fixation of the thermostat in the thermostat housing after its installation in the internal cavity of the cylindrical part;

[0043] 11 - an annular recess on the outer surface of the cylindrical part of the thermostat housing for placing an annular gasket in it for sealing the thermostat housing with the thermostat located inside it after it is installed in the mating hole of the coolant flow control unit.

[0044] Fig. 1 shows a photo of the thermostat housing according to the proposed utility model, and Fig. 2 shows a photo of the thermostat installed in it.

[0045] Fig. 3 shows an axonometric view of the thermostat housing.

[0046] Fig. 4 shows a top view of the thermostat housing with section line AA indicated.

[0047] Fig. 5 - cross-sectional view of the thermostat housing along line AA.

[0048] Implementation of a utility model

[0049] Structurally, the proposed thermostat housing contains a cylindrical part 1 and a mounting flange 2 with holes 4 for threaded fastening of the thermostat housing to the coolant flow control unit.

[0050] Inside the cylindrical part of the thermostat housing, a cavity 8 is made for accommodating a thermostat with an internal annular stop 10, designed for axial positioning of the thermostat inside the housing, and in the lower part of the thermostat housing, openings 9 are made for coolant flows.

[0051] A threaded hole 3 is made in the end part of the mounting flange 3 along its axis, used for a threaded plug, sensor or process plug.

[0052] On the outer end surface of the mounting flange 2, predominantly radially oriented stiffening ribs 5 are made, and on its side surface from the side of its mating surface 6, recesses 7 are made for interaction with a dismantling tool when dismantling the thermostat housing from the mating hole of the cooled liquid flow control unit.

[0053] In preferred design options, the number of stiffening ribs (5) on the end surface of the mounting flange corresponds to the number of fastening holes on the mounting flange with their radial orientation.

[0054] This arrangement of the stiffening ribs 5 and the recesses 7 for the dismantling tool on the mounting flange ensures optimal redistribution of the deforming mechanical loads on the mounting flange 2 when dismantling the housing and reduces local stresses in the areas of the mounting flange weakened by the fastening holes.

[0055] The recesses 7 for the dismantling tool are made open to the outer contour of the mounting flange 2 and are preferably located between adjacent fastening holes.

[0056] The geometry of the recesses is selected to ensure the installation of mounting blades, pullers or other dismantling tools in them.

[0057] Due to this, when removing the thermostat housing together with the thermostat installed in it from the coolant flow control unit, the force is applied not to the areas weakened by the mounting holes, but to the areas of the mounting flange that can withstand the mechanical loads of dismantling, which reduces the risk of cracking and destruction of the thermostat housing as a whole, that is, the resistance of the thermostat housing to mechanical loads during its dismantling is increased.

[0058] During operation, the thermostat housing functions as usual, ensuring the fastening of the thermostat housing together with the thermostat located in it to the mating unit of the cooling system, placing the thermostat, which ensures the passage of coolant through the internal cavity of the thermostat housing with the division of the coolant into two streams and automatic regulation of the ratio of the volumes of these divided streams depending on the regulated temperature of the coolant.

[0059] At the same time, the presence of stiffening ribs increases the strength of the housing in the most loaded areas, and the presence of recesses on the mounting flange on the mating surface side simplifies dismantling the housing while maintaining its integrity during repair and technological work.

[0060] The utility model can be implemented using known foundry technologies and subsequent mechanical processing. The housing design is easy to manufacture and does not require the use of fundamentally new materials or processes, and the proposed modifications can be implemented within the framework of serial production. Therefore, the utility model meets the criteria for industrial applicability.

[0061] The thermostat housing of the engine liquid cooling system is made with a cylindrical part with an internal cavity for accommodating the thermostat and with a mounting flange with holes for fastening the housing to the cooled liquid flow control unit after installing the thermostat housing with the thermostat located in it into the mating hole of the cooled liquid flow control unit

[0062] The outer end surface of the mounting flange is provided with radially oriented stiffening ribs, and the mounting flange, on the side of the mating surface, is provided with recesses designed for interaction with the dismantling tool.

[0063] The stiffening ribs are preferably oriented radially towards the axes of the mounting holes on the mounting flange and are made integral with the housing.

[0064] This design of the mounting flange in the thermostat housing ensures the transfer of mechanical forces arising in the flange area to the cylindrical part of the housing, which has greater rigidity and load-bearing capacity.

[0065] This reduces the risk of local overvoltage and damage to the mounting flange in areas adjacent to the mounting holes.

[0066] On the lower mating surface of the mounting flange, outwardly open recesses are made for the dismantling tool, which are preferably located between adjacent fastening holes on the mounting flange.

[0067] The specified recesses form structurally provided places for contact with the dismantling tool to redirect mechanical loads from the dismantling tool from the edges of the mounting flange to the cylindrical part of the thermostat housing, which, when dismantling the thermostat housing, protects the areas of the mounting flange weakened by the mounting holes from damage.

[0068] When dismantling the housing from the mating hole of the coolant flow control unit, the dismantling tool is inserted into the recesses 7 made on the side surface of the mounting flange 2 from the side of its mating surface 6.

[0069] By applying disassembly forces to the recesses 7, the need to apply disassembly forces to the sections of the mounting flange 2 weakened by the holes 4 is reduced, and the stiffening ribs (5) on the end surface of the mounting flange 2 additionally redistribute the loads arising during disassembly from the edges of the mounting flange 2 to the cylindrical part 1 of the housing. This reduces the likelihood of cracks forming and the destruction of the housing during disassembly in the sections of the mounting flange 2 weakened by the holes 4.

[0070] The utility model can be implemented using known technologies of foundry production and subsequent mechanical processing.

[0071] The annular rectangular recess 11 on the outer surface of the cylindrical part of the housing under the mating surface 6 of the mounting flange 2 is intended for placing a sealing element that ensures the sealing of the connection of the cylindrical part of the housing 1 with the mating hole of the coolant flow control unit.

[0072] When installing the thermostat housing in the coolant flow control unit, the sealing element in the annular recess 11, interacting with the surface of the mating hole, prevents the coolant from leaking through the gap between the outer surface of the cylindrical part of the thermostat housing 1 and the wall of the mating hole of the coolant control unit.

[0073] When assembling, the thermostat is installed in the internal cavity of the cylindrical part of the housing from the side opposite to the mounting flange until it contacts the internal annular stop 10, which ensures axial positioning of the thermostat in the housing.

[0074] After installing the thermostat in the housing, it is secured with a sealing element designed for it, positioned between the outer surface of the thermostat and the inner surface of the housing. This element ensures that the thermostat remains in position relative to the side openings of the housing, which are designed to allow coolant flow.

[0075] The thermostat housing with the thermostat installed is inserted with its cylindrical portion into the mating bore of the coolant flow control unit. The cylindrical portion of the housing is positioned in the specified bore, and the housing mounting flange, with its mating surface 6, is positioned on the corresponding mating surface of the coolant flow control unit bore.

[0076] After aligning the mounting holes of the mounting flange with the corresponding threaded holes of the block, the thermostat housing is secured with threaded fasteners.

[0077] The tightness of the connection between the thermostat housing and the coolant flow control unit is ensured by the seating and sealing elements provided by the design of the unit.

[0078] During engine operation, coolant enters the coolant flow control unit and passes through the thermostat housing, where the coolant is divided into two streams by the thermostat valve element and the holes on the cylindrical part.

[0079] The thermostat, located in the housing cavity, senses the temperature of the passing coolant and, depending on its value, changes the position of its valve element, regulating the ratio of the volumes of the separated coolant flows.

[0080] Initially, the thermostat limits the flow of coolant through the large circuit of the cooling system, ensuring circulation of liquid through the small circuit and accelerated warming up of the engine.

[0081] When the coolant temperature rises, the thermostat's temperature-sensitive element moves the valve element, resulting in a change in the ratio of coolant flows between the flow control unit channels and the corresponding cooling system circuits, ensuring the required coolant temperature.

[0082] The proposed housing ensures the placement and axial positioning of the thermostat, the passage of coolant through the internal cavity and side openings of the cylindrical part, as well as the fastening of the housing in the coolant flow control unit.

[0083] The stiffening ribs on the mounting flange increase the resistance of the flange part of the housing to mechanical loads that occur during dismantling, and the recesses for the dismantling tool allow the application of dismantling force to specially provided areas of the housing, reducing the risk of damage to areas weakened by the mounting holes.

[0084] The proposed thermostat housing can be made of a material commonly used in mechanical engineering using technologies commonly used in engine manufacturing on conventional equipment.

[0085] The thermostat housing is made by casting from cast iron or from structural cast steel with subsequent mechanical processing of the mating surface 6 and holes 4 for threaded fastening of the thermostat housing to the coolant flow control unit.

[0086] The proposed thermostat housing design is easy to manufacture, does not require the use of special materials or processes, and can be manufactured in series production, which proves that the proposed model meets the industrial applicability criteria.

[0087] The proposed design of the thermostat housing ensures the possibility of achieving the technical result, since its proposed design ensures the preservation of the integrity of the thermostat housing during dismantling as a result of the redistribution of mechanical loads by radially oriented stiffening ribs located on the end part of the mounting flange of the dismantling loads from the edges of the mounting flange to the main cylindrical part of the housing and the application of dismantling forces to recesses specially provided near the outer surface for the dismantling tool on the side surface of the mounting flange from the side of its mating surface to the cylindrical part of the housing.

[0088] Thus, the design features of the proposed thermostat housing are in a cause-and-effect relationship with the problem being solved and the technical result achieved - increasing the resistance of the thermostat housing to the effects of mechanical loads during its dismantling.

[0089] Illustrations in the drawings of the design features and characteristics and a description of its operation prove the feasibility and industrial applicability of the proposed utility model.

[0090] Taking into account the novelty of the set of essential features, the technical solution to the problem, the significance of all general and particular features proven in the section “Prior Art” and “Essence of the Utility Model”, the technical feasibility and industrial applicability of the utility model proven in the section “Implementation of the Utility Model”, the confident solution to the technical problem and the proven possibility of achieving a technical result during the implementation and use of the utility model, in our opinion, the claimed technical solution satisfies all the requirements of protectability imposed on utility models.

[0091] The analysis also shows that all general and specific features of the utility model are essential, since each of them is necessary, and all together they are not only in a causal relationship with the technical result, but are also sufficient to achieve the technical result and allow the utility model to be implemented industrially.

Claims

1. A thermostat housing for a liquid cooling system of an engine with a coolant flow control unit, comprising a cylindrical part (1) with a coaxial cavity (8) for the thermostat and lateral openings (9) for coolant flows, made with the possibility of installation in a mating opening of the coolant flow control unit, and a mounting flange (2) with openings (4) for threaded fastening of the thermostat housing to the coolant flow control unit, characterized in that the mounting flange (2) contains stiffening ribs (5) located on its end surface, made integral with the housing, oriented in radial directions in accordance with the axes of the openings (4) for threaded fastening of the thermostat housing to the coolant flow control unit.

2. The thermostat housing according to paragraph 1, characterized in that it additionally contains recesses (7) for a dismantling tool located on the side surface of the mounting flange (2) on the side of its mating surface (6).

3. The thermostat housing according to paragraph 2, characterized in that the recesses (7) for the dismantling tool on the side surface of the mounting flange (2) on the side of its mating surface (6) are located in the spaces between the holes (4) for threaded fastening of the thermostat housing to the coolant flow control unit.

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