DE3226988A1 - Three-way thermostatic valve for a cooling circuit with the possibility of bypassing the radiator - Google Patents

Description

32Z6388

IAO Industry Riiipite: S; piA. '^# . "> y 68082-A / 81

Three-way thermostatic valve for a cooling circuit with the option of bypassing the cooler

The invention relates to a three-way thermostatic valve for a cooling circuit with the possibility of bypassing of the cooler, in particular for the cooling circuit of an internal combustion engine, with a valve housing in which a Opening for the inlet of the coolant from the engine, a first outlet opening to the radiator and a second outlet opening are arranged to the engine, the two outlet openings lying one behind the other in an axis are arranged, with a thermostatic capsule, the length of which can be changed as a function of temperature and which on the one hand is supported on a curled shoulder and on the other hand rests against an annular locking plate, which in turn is pressed by a spring element against a valve seat arranged at the first outlet opening with one with the thermostatic capsule and the locking plate connected valve element, the temperature-dependent the opening cross-section of the passage between Inlet opening and second outlet opening controls.

Valves of this type are used in the cooling circuits of internal combustion engines used in order to reduce the

IAO Industrie Riünite S.p.A < 68082-A / 81

run the liquid over the cooler by closing the first outlet opening with the help of the to prevent the valve seat in question cooperating closing element in the form of a closing plate. at In this operating state, the valve functional parts connected to the jacket of the thermostatic capsule are one second valve device opened so that the liquid flowing through the inlet opening directly to the motor can flow back via a bypass line connected to the second outlet opening. This is done in this way the engine heats up to operating temperature more quickly. When the temperature of the liquid increases gradually As the operating temperature approaches, the thermostat capsule expands, gradually opening the first one Outlet opening and progressively closes the second outlet opening until it is completely closed, which takes place at the predetermined operating temperature.

In the conventional valves, the aforementioned, connected to the jacket of the thermostatic capsule valve functional part a second closure plate which cooperates with a valve seat connected to the second outlet opening. This locking plate is slidably mounted on an axial shaft which is on the end of the Thermostatic capsule is arranged, which is opposite the end from which the sliding part of a thermostatic capsule stands out. Between the jacket of the thermostatic capsule and this second sealing plate is a Helical spring generally used with a conical design. This spring has the task of an eventual Overstretching of the jacket of the thermostat capsule in the direction of to compensate for the second outlet opening, thereby keeping the second sealing plate in contact with its seat and at the same time the thermostatic capsule

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3ZZ698Ö

IAO Industry Riujiiite: SrpiA, ''. "», · '68082-A / 81

ability to expand to the extent determined by the temperature of the coolant around them.

However, a disadvantage of this design is that the temperature-dependent expansions between a thermostatic capsule and another differ from one another, and it is not uncommon for the Expansion of a thermostatic capsule to such an extent that the spring of the second locking plate completely is compressed into a block and that if the capsule expands beyond that, damage enter. The coolant also tends, as it normally consists of water and an anti-freeze additive there is, in addition, scale between the second locking plate and its seat and between the turns the spring connected to the second locking plate and between the second locking plate and the shaft, - on which this slides to form. This results in malfunctions such that a complete closure the second outlet opening becomes impossible or that the second sealing plate is stuck on its seat .

The known valves are also proportionate complicated due to the fact that the jacket of the thermostatic capsule must be provided with a shaft, on which the spring and the second locking plate are to be pushed one after the other, whereupon the end of the shaft must be riveted to form an edge that retains the locking plate on the shaft.

The object of the invention is to create a thermostatic valve of the type mentioned at the outset, in which the aforementioned Operational difficulties do not occur and that

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Furthermore, in comparison to the known valves, it is simpler in its design and therefore less expensive is.

According to the invention, this object is achieved in that the valve element is a cup-shaped valve slide, which is displaceable inside a housing extension which has a lateral opening through which the inlet opening and the second outlet opening can be connected to one another. A further development provides that the Housing approach is formed by a cage insert at the second outlet opening, which has an inner continuous has a cylindrical cavity and the side wall has a window-like cutout, and that the closing plate forms the valve slide, Has cup-shaped extension which is slidably disposed in the cavity of the cage insert, the cup-shaped Approach has a side wall provided with a window-like cutout and a continuous bottom, so that the opening cross-section of the window-like cutout of the cage insert to the second outlet opening can be regulated as a function of temperature by shifting the valve element.

According to this solution idea is the one with the jacket of the thermostat capsule connected valve function part for closing the passage between the inlet opening and the second outlet opening is a slide which is displaceable in the cylindrical cavity of the cage insert, wherein the slide is formed by the cup-shaped extension and especially its full bottom wall. One defined end position is practically not provided for the cup-shaped approach, since this up to one any given by the expansion of the thermostatic capsule

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Immerse deep into the cage insert and thereby close its opening cross-section. In this way the problems associated with the prior art valves by deformation after compression are circumvented the one connected to the second sealing plate Spring on block are given, because in the valve according to the present invention, this closure plate is as well as the associated spring no longer available.

The use of a slide valve also offers the advantage of self-cleaning, as the cup-shaped approach with every movement in the cage insert the scale deposits that may be present in it by wiping off removed.

An additional advantage of the valve according to the invention consists in the omission of the shaft of the thermostatic capsule, of the second sealing plate and its spring and the associated assembly processes, so that the valve according to the invention over the known valve of the aforementioned type proves to be more cost-effective.

The spring element expediently surrounds the thermostatic capsule and has one end on the closure plate and with it the other end to the valve body. The contact surface of the spring element on the valve housing can be advantageous be an annular shoulder of the cage insert.

An advantageous further development provides that the jacket of the thermostatic capsule has a retaining collar on the outer circumference has, which takes place in an annular seat of a component on which the closure plate and the cup-shaped approach are formed that the cage

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set a centering shoulder for use in an annular seat formed on the second outlet opening has and that the retaining collar and the tubular extension by the bias of the spring element in their corresponding annular seats are retained. This means that it is inexpensive to manufacture and assemble possible.

It is useful to manufacture the component as a molded part made of plastic.

It is particularly advantageous to design the thermostatic valve so that the valve housing comprises a base part, in which the inlet opening and the second outlet opening are formed and which has an opening in which the valve assembly is arranged with the closure plate, wherein the opening has a flange on which a tubular part which has the first outlet opening, the associated valve seat and a connecting piece, can be fastened is.

The bottom part of the housing can advantageously consist of a light metal alloy.

An advantageous mounting option results from the fact that the tubular part is arranged radially on the outside Has annular collar and the flange of the bottom part is designed as an annular ring, which after plastic Deformation encloses the collar.

It is also provided that the shoulder to support the Thermostatic capsule with a central hub connected to the outer wall of the tubular part via spokes is, with the hub in relation to the currents

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direction of the liquid behind the seat for the Closing plate is arranged.

A favorable manufacturing option results from the design of the tubular part as a pressed part made of synthetic material.

It is particularly advantageous to use the sealing plate to provide a bore in which a unidirectional valve is arranged, which opens the passage of the Coolant from the first outlet opening to the inlet opening. This allows the engine to operate with the Coolant can be filled via the nozzle or via the radiator when the engine is cold and the first outlet opening closed is.

Embodiments of the invention are in the drawing and are described in more detail below. Show it:

Fig. 1 is a sectional view of the valve with

open connection between the inlet opening

and the second outlet opening to the motor and closed connection to the Cooler,.

Fig. 2 is a sectional view with an open connection between the inlet opening and the first outlet opening to the cooler and closed connection to the Mo

gate,

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3 is an exploded perspective view of components of the valve.

1 and 2, a three-way thermostatic valve is shown with a housing with a bottom part 10, which consists of a light metal alloy and a tubular part 12 made of plastic material for the temperatures of the coolant is stable. The bottom part 10 comprises a flange 14 for attachment - with the interposition a seal - on a corresponding surface of the engine block of an internal combustion engine.

A cavity 16 is formed in the bottom part 10. In the cavity 16 opens an inlet opening 18, which with a corresponding opening in the face of the engine block communicates and through which the from the inside The cooling liquid coming from the engine flows into the cavity 16.

The bottom part 10 has a flanged opening 20 at the top into which a corresponding flanged end of the tubular part 12 engages. The flange of the tubular part 12 consists of a radially outwardly arranged annular collar 22. The corresponding flange of the bottom part 10 in turn comprises an annular rim 24, which after aligning the flanged end of the tubular member 12 over the opening 20 via the collar 22 is compressed and grips and holds it tightly and tightly.

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IAO Industrie Riuni'te \ slp * .JA .; · * '_; * ' _: .''6

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The tubular part 12 forms with its upper part Nozzle 26 on which a connecting element for connection to the inlet of the cooler is pushed and clamped will.

Three radial spokes 28 are formed in the connecting piece 26 which converge towards the axis of the tubular part 12 and end in a central hub 30 which has a blind bore 32 directed inwardly towards the cavity 16.
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The section of the tubular part 12 lying between the connecting piece 26 and the rim 24 widens in stages always stronger and has an inner frustoconical section, the inner surface 32 of which has a valve seat 34 represents. The zone surrounded by the valve seat 34 is referred to below as the first outlet opening, which has the reference number 36 is assigned, designated.

With particular reference to FIG. 3, an annular closure plate 38 cooperates with the valve seat 34. The closure plate 38 is part of a component 40, which further has a cup-shaped extension 42. The approach 42 has one with four window-like cutouts 44 provided side wall and a continuous bottom 46. The cup-shaped extension 42 has a cylindrical Envelope shape.

In the cup-shaped extension 42 a generally designated 48 thermostat capsule is arranged. This capsule 48 of the well known type includes a cylindrical Jacket 50, which is closed at one end (the lower one in the figures) and from the other end of which a ram

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Gan in the form of a piston 52, which ends with a pin 53, goes out. The capsule 48 is made of a material such as wax filled, its under the action of the heat of the coolant that passes through the cutouts 44 washes around the jacket 50, expansion caused the piston 52 to emerge from the capsule 48 causes proportional to the temperature of the coolant.

Of the. Pin 53 engages in the blind hole 32 of the hub 30, so that the increase in the axial length of the Capsule 48 expresses in a shift of the shell 50 downwards.

At the end of the jacket 50 from which the piston 52 protrudes, there is a retaining collar 54 on the circumference Retaining collar 54 is received in a seat 56 recessed in the center of the closure plate 38.

In the bottom part 10 of the valve housing, axially aligned with the first outlet opening 36, there is a second one Outlet opening 58, to which a pipe 60 is coupled, leading to an inlet into the cooling circuit of the engine leads behind the radiator. The second outlet opening 58 therefore represents a bypass for the cooler.

On the side of the cavity 16, the second outlet opening 58 is delimited by an annular seat 62, the arranged coaxially with the thermostat capsule 48 and the tubular part 12 and thus with the first outlet opening 36 is.

With this seat 62 and with the opening 58 a designated assembly with 64 cage insert is connected, the also advantageously made of pressed, compared to the

IAO Industry Riunitie ^: S; pA ^. ' *. " _: .-168082-A / 81

Temperature of the coolant resistant plastic material consists.

The cage insert 64 is characterized by a generally cylindrical shape so that its side wall is continuous inner cylindrical cavity 66 limited. This side wall points in the same way as the cup-shaped one Approach 42 has four window-like cutouts, which are denoted by 68. The cutouts 68 bring the cylindrical cavity 66 via the cutouts 44 of the cup-shaped extension 42 with the cavity 16 of the valve housing and thus with the inlet opening 18 in connection.

The insert 64 has at its lower end a tubular centering extension 70, which seals with more precisely Fit in the seat 62 of the second outlet opening 58 is arranged. On the opposite, to the locking plate 38 toward the end, the cage insert 64 has a shoulder surface 72 on the inside. Between this shoulder surface 72 and the locking plate 38, a helical compression spring 74 is used, which has the task of the locking plate 38 to push back against its valve seat 34. The compression coil spring 74 also has a holding function for the thermostat capsule 48, for the component 40 and for the cage insert 64 in the assembled state, from which there is a simplification for the assembly. Because of its upward pressure, the helical compression spring holds 74 the seat 56 of the closure plate 38 is connected to the retaining collar 54 and the pin 53 of the thermostatic capsule 48 in the blind bore 32 of the hub 30. At the same time holds the helical compression spring 74 by their Press down the tubular centering extension 70 of the cage insert 64 in its seat 62.

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The diameter of the side wall of the cup-shaped extension 42 and the diameter of the continuous cavity 66 of the cage insert 64 correspond to one another so that a sliding fit of the cup-shaped extension in the cage insert 64 is produced.
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Before the functional description of the valve is another Describe item that is connected to the locking plate. The latter has a through hole 75 in which a unidirectional valve 76 is slidably disposed. It should be noted that the described Valve 76 is able to be installed in the position in which it is shown. The valve 76 has a lower one Closure element 78, which by a shaft 80 with a upper retaining wing 82 is connected. The shaft 80 sits with ample play in the bore 75, and the Retaining wing 82 is designed so that the bore is not occluded.

The valve 76 is designed to fill the engine with the coolant Allow via the nozzle 26 or the radiator while the engine is cold and the first outlet opening 36 is closed by the closing plate 38. The valve 76 allows the liquid to flow down the hole 75 to. However, if the engine is running and the first outlet opening 36 is blocked, pushes

the pressure prevailing in the cavity 16 pushes the closure element 78 against the lower edge of the bore 75 and thus prevents the liquid from passing through the first outlet opening 36.
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The arrangement of the closure element 76 in the closure plate 38, which is known per se, is advantageous in that than it keeps the external dimensions of the valve small. A similar closure member is in fact in the known valves not arranged in the sealing plate, but in a bypass passage in one of the tubular Part 12 corresponding part is and its dimensions increased.

The operation of the valve will now be described.

If the engine is started up in a cold state, the valve is in the state as shown in Fig. 1, with the thermostatic capsule 48 contracted and the first outlet opening 36 through the sealing plate 38 is blocked. The cup-shaped extension 42, the locking plate 38 necessarily in his Movements follows, is in the raised position in which it only partially extends into the cage insert 64, so that the communicating connection between the inlet opening 18 and the second outlet opening 58 is made via the window-like cutouts 68.

Since the cavity 16 is filled with liquid, it washes around the thermostatic capsule 48 via the cutouts 44 of the cup-shaped extension 42. As the temperature of the coolant gradually increases, the thermostat capsule expands 48 off; the closure plate 38 and the cup-shaped extension 42 begin to move downward move, and the first exit port 36 begins to slowly open.

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If the temperature of the liquid is the desired operating value has reached, the cup-shaped approach has reached the position shown in Fig. 2, in which his Bottom 46 has completely passed through the cavity 66 of the cage insert 64 and the connection between the cutouts 68 and the second outlet opening 58 is blocked. This is how the circulation takes place Liquid all over the cooler, i.e. from the inlet opening 18 to the first outlet opening 36.

Even under the conditions shown in FIG the thermostatic capsule 48 was flushed by the liquid present in the cavity 16, since its jacket 50 with the cavity 16 via the cutouts 44 of the cup-shaped extension 42 and the cutouts 68 of the cage insert 64 in Connection. On the one hand, this serves to reverse the function of the valve by returning it to the to cause the position shown in Fig. 1 when the liquid cools.

If the temperature of the liquid rises, then on the other hand the thermostatic capsule 48 expands further and the cup-shaped projection 42 can slide further down into the cage insert 64 without encountering an obstacle, so that it is not necessary to select the thermostatic capsule 48 so that the design does not Risk of excessive stretching.

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Claims (12)

t TC IAO Industrie Riunite S.p.A. June 1, 1982 Beinasco / Turin ZL / Br / ro 0065P 68082-A / 81 E. Saino - 4th Claims ; flJ three-way thermostatic valve for a cooling circuit with bypassing the radiator, in particular for the cooling circuit of an internal combustion engine, with a valve housing in which an opening for the inlet of the coolant from the engine, a first outlet opening to the radiator and a second outlet opening to the engine are arranged, The two outlet openings are arranged one behind the other in an axis, with a thermostatic capsule, the length of which can be changed as a function of temperature and which is supported on the one hand on a shoulder fixed to the housing and on the other hand rests against an annular closure plate, which in turn rests against one at the first outlet opening through a spring element arranged valve seat is pressed, with a valve element connected to the thermostatic capsule and the sealing plate, which, depending on the temperature, controls the opening IAO Industry Riuhi'öe · Ö.; D ^ A; ' ': ":.' * 68082-A / 81 cross section of the passage between the inlet opening and the second outlet opening controls, thereby characterized in that the valve element is a cup-shaped valve slide (42) which is displaceable inside a housing extension (64) which has a lateral opening (68) over which the inlet opening (18) and the second outlet opening (58) can be connected to one another. 2. Valve according to claim 1, characterized characterized in that the housing extension is formed by a cage insert (64) at the second outlet opening ( 58) which has an inner continuous cylindrical cavity (66) and the side wall of which has a window-like cutout (68), and that the closure plate (38) has a cup-shaped extension which forms the valve slide (42) which is slidably disposed in the cavity (66) of the cage insert (64), the cup-shaped Approach (42) one with a window-like Has cutout (44) provided side wall and a continuous bottom (46), so that the opening cross-section the window-like cutout (68) of the cage insert (64) to the second outlet opening (58) can be regulated as a function of temperature by shifting the valve element. 3. Valve according to claim 1, characterized characterized in that the spring element (74) surrounds the thermostatic capsule (48) and with the one end rests on the closure plate (38) and the other end on the valve housing. IAO Industrie Riunite S.p.A. 68082-A / 81 4. Valve according to claim 3, characterized in that the contact surface of the spring element (74) on the valve housing is an annular shoulder (72) of the cage insert (64). 5. Valve according to one or more of the preceding ^ claims, characterized in that • the jacket (50) of the thermostatic capsule (48) has a retaining collar (54) on the outer circumference, which in an annular seat (56) of a component (40) takes place on which the closure plate (38) and the Cup-shaped extension (42) are designed that the cage insert (64) has a centering extension (70) for a • set in an annular seat (62) formed on the second outlet opening (58) and that the retaining collar (54) and the centering shoulder (70) by the bias of the spring element (74) in their corresponding annular seats (56,62) are retained. 6. Valve according to one or more of the preceding claims, characterized in that that the component (40) is a molded part made of plastic. 7. Valve according to one or more of the preceding Claims, characterized in that the valve housing comprises a bottom part (10) in which the inlet opening (18) and the second outlet opening (58) are formed and the one opening (20), in which the valve assembly with the closure plate (38) is arranged, wherein the IAO Industry Riuhike · 8ΐρ ^ Α, · '· ". ··!' . ^: 68082-A / 81 - t · · "ϊ ^e - 4 ~ Opening (20) has a flange on which a tubular Part (12), which the first outlet opening (36), the associated valve seat (34) and a Has connector (26), can be fastened. 8. Valve according to claim 7, characterized in that the bottom part (10) of the housing is made from a light metal alloy consists. 9. Valve according to claim 7, characterized in that the tubular part (12) has a radially outwardly arranged Has an annular collar (22) and the flange of the bottom part (10) is designed as an annular rim (24) is, which encloses the collar (22) after plastic deformation. 10. Valve according to one or more of the preceding claims, characterized in that that the shoulder for supporting the thermostatic capsule (48) consists of a central hub (30) which has spokes (28) is connected to the outer wall of the tubular part (12), the hub (30) in relation is arranged in the direction of flow of the liquid behind the seat (34) for the closure plate (38). 11. Valve according to one or more of the preceding claims, characterized in that that the tubular part (12) is a pressed part made of synthetic material. IAO Industrie Riuiiite S.p.A, '68082-A / 81 12. Valve according to one or more of the preceding claims, characterized in that that the closure plate (38) has a bore (75), in which a unidirectional valve (76) is arranged, which allows the passage of the coolant from the first outlet opening (36) to the inlet opening (18).