Wax-based thermostat assembly

Abstract

Wax-based thermostat arrangement (1) for regulating the coolant temperature in engine arrangements, characterized in that it comprises: a tubular body (10) which has a bypass inlet (11) and a radiator inlet (12) for the inlet of coolant flows; a mixing chamber (32.7) which is provided such that the coolant flows flowing through the bypass inlet (11) and the cooler inlet (12) in the said body (10) come together to mix; an outlet (13) arranged on the body (10) to provide the outlet of the mixing chamber (32.7) after the mixing of the coolant flows; a valve structure (30) which is arranged inside such that it is displaceable within the body (10) mentioned above; a thermal actuator (20) with a temperature-sensitive housing (21) containing wax in the valve body (32) to move the valve structure (30) by reacting to the temperature of the coolant mixture in the mixing chamber (32.7), and a piston (22) whose one end is connected to the body (10) so that it cannot move in its own displacement direction, and whose other end is located in the temperature-sensitive housing (21); a spring element (40) that is positioned to apply a force to move the said valve structure (30) in the opposite direction to the displacement provided by the thermoactuator (20); lower and upper radiator valve elements (31, 33) arranged to control the amount of coolant flowing onto said valve structure (30) by at least partially opening or opening the bypass inlet (11) and the radiator inlet (12). will close if the valve structure (30) shifts within the body; a primary barrier (32.2) arranged to cover at least a portion of the circumference of the thermal actuator to prevent said coolant from coming into contact with the temperature-sensitive housing before the coolant flow from the bypass or radiator inlet reaches the mixing chamber; and a secondary barrier wall (32.3) designed such that the coolant flows can flow from the said mixing chamber (32.7) to the outlet (13) after they have mixed together in the mixing chamber (32.7).

Description

Technical field

[0001] The invention relates to a wax-based thermostat arrangement which, by providing the mixture of the coolants coming from the bypass inlet and the radiator inlet until they reach the thermocouple, presents the valve control (flap control) depending on the engine inlet temperature. State of the art

[0002] Coolant temperature control in internal combustion engines is a very important component for maintaining vehicle performance. Coolant temperature control indirectly enables temperature control of the engine and engine components inside the vehicle.

[0003] Engine cooling systems used to control the temperature of the engine system typically use the position of the thermocouple in the thermostat assembly to determine whether the coolant exiting the engine passages is cooled based on the temperatures of the coolants exiting the bypass outlet and the radiator outlet. Wax-based thermoactuators are typically used here. Depending on the coolant temperatures exiting the bypass outlet and the radiator outlet, the bypass and the coolant open and close by moving a thermoactuator valve to the internal volume of the thermostat.

[0004] A perspective view and a side sectional view of the conventional valve structure are shown in Fig. 7a and Fig. 7b. A side view of the conventional thermostat assembly and the related coolant flow mechanism is shown in Fig. 8. As can be clearly seen from this figure, the warm coolant coming from the bypass inlet and the cold coolant coming from the radiator inlet flow separately into the interior of the thermostat and mix at the thermostat outlet. Therefore, the thermoactuator here guides the valve structure depending on the temperature of the warm coolant, which is in full contact with the temperature-sensitive housing. This means that the cold coolant has little or no contact with the thermocouple, since the flow of cold coolant in the interior of the thermostat remains below the thermocouple. Therefore, valve control occurs only depending on the temperature of the warm coolant coming from the bypass inlet. However, many automobile manufacturers prefer to use cooling systems that allow coolant temperature control depending on the thermostat outlet temperature to directly control the engine inlet temperature.

[0005] Patent EP2309106B1 describes a cooling system for engine assemblies. This patent incorporates a mixing chamber into which the coolants are filled before entering the thermostat for mixing, specifically for mixing the coolants. Here, the mixing chamber is used as an external solution and takes up additional space.

[0006] DE 20 2015 002 412 U1 relates to a thermostatic valve for an internal combustion engine. DE 71 42 759 U describes a thermostat for the cooling circuit of internal combustion engines. EP 0 187 378 B1 discloses a thermostatic valve.

[0007] Consequently, there is a need for a valve structure that prevents hot and cold coolants from coming into direct contact with the thermocouple before mixing. Object of the invention

[0008] The object of the present invention is to present a valve structure only for detecting the thermostat outlet temperature from the thermocouple.

[0009] Another object of the invention is to enable valve control depending on the engine inlet temperature by mixing the coolants coming from the bypass inlet and the radiator inlet until they reach the thermocouple.

[0010] Another object of the invention is to provide better mixing of cold and warm flow lines compared to other flow mixing methods.

[0011] Another object of the invention is to provide better pressure drop values ​​than other flow mixing processes. Brief description of the invention

[0012] The invention is defined in the independent claim. Dependent claims describe preferred embodiments.

[0013] The present invention is a wax-based thermostat assembly for regulating coolant temperature in engine assemblies, designed to achieve all of the above-mentioned objects and will become apparent from the detailed description below. Accordingly, it comprises a tubular body having a bypass inlet and a radiator inlet for allowing the inlet of coolant; a mixing chamber provided to collect the coolants flowing from the bypass inlet and a radiator inlet in the body for mixing; an outlet disposed on the body to allow coolants to exit into the mixing chamber after mixing; said valve structure is disposed internally so as to be movable within said body;a thermal actuator having a temperature-sensitive housing containing wax in the valve body for displacing the valve structure in response to the temperature of the coolant mixture in the mixing chamber, and a piston having one end connected to the body so that it cannot displace in its own direction of displacement and the other end located in the temperature-sensitive housing; a spring element positioned to apply a force to displace said valve structure in the opposite direction to the displacement provided by the thermal actuator; lower and upper radiator valve elements arranged to control the amount of coolant flowing onto said valve structure by at least partially opening or closing the bypass inlet and a radiator inlet as said valve structure displaces within the body;a primary barrier wall arranged to cover at least part of the periphery of the thermal actuator to prevent said valve from coming into contact with the temperature-sensitive housing before the coolant coming from the bypass or cooler inlet reaches the mixing chamber. Thus, the warm coolant coming from the bypass inlet is transferred into the mixing chamber by contacting the thermal actuator, in particular the temperature-sensitive housing, by touching the primary barrier wall, where, after mixing with the coolant coming from the cooler inlet, the cooler temperature is sensed by the thermal actuator.

[0014] In a preferred embodiment of the invention, said upper valve element comprises an annular seat extending radially to the bypass inlet and a wall perpendicular to the annular seat to partially cover the bypass inlet.

[0015] In a preferred embodiment of the present invention, said lower valve element comprises an extension extending radially from the bottom of the valve body and capable of at least partially closing the radiator inlet.

[0016] The invention comprises a secondary barrier wall which is designed so that the coolant streams can flow from said mixing chamber to the outlet after they have mixed with each other in the mixing chamber.

[0017] In a preferred embodiment of the invention, the part of said secondary barrier wall which transfers the mixed coolant to the outlet is arranged as a curved surface in order to prevent the mixed coolant from forming turbulence while flowing to the outlet.

[0018] In another preferred embodiment of the invention, said mixing chamber is provided between the primary barrier wall and the secondary barrier wall.

[0019] A preferred embodiment of the invention comprises two connecting walls connecting the primary and secondary barrier walls.

[0020] In another preferred embodiment of the invention, said mixing chamber is provided between primary and secondary barrier walls and connecting walls.

[0021] A further preferred embodiment of the invention comprises a removable cover at the base of said body, which includes a spring seat on which the spring element can be placed.

[0022] In another preferred embodiment of the invention, the valve body is a tubular type.

[0023] One example of the present disclosure relates to an engine assembly for achieving all of the above-mentioned purposes, which will become apparent from the detailed description below. Accordingly, it comprises an engine having an engine outlet and inlet; a thermostat assembly according to any one of the preceding claims; a bypass passage through which warm coolant flows, one end of which is connected to the engine outlet and the other to the bypass inlet; a radiator passage having a radiator for cooling the coolant coming from the engine outlet; and an outlet passage having one end connected to the engine inlet and the other end connected to the outlet of the thermostat assembly. Thus, the temperature of the coolant supplied to the engine can be more accurately determined. Short description of the characters In Fig. Figure 1a shows a perspective view of the present valve structure with thermocouple. In Fig. Figure 1b shows another perspective view of said valve structure together with the thermocouple. In Fig. 2 shows a side view of the present valve structure. In Fig. Figure 3a shows a side view of the present thermostat arrangement. In Fig. Figure 3b shows another side view of the thermostat arrangement mentioned. In Fig. Figure 4a shows a front view of the present thermostat arrangement. In Fig. Figure 4b shows a perspective view of the present thermostat arrangement. In Fig. Figure 5a shows a top view of the present thermostat arrangement. In Fig. Figure 5b shows an exploded perspective view of the present thermostat assembly. In Fig. 6, the flow lines of the hot and cold coolant are shown in the partially open position of the present thermostat arrangement. In Fig. Figure 7a shows a perspective view of the traditional valve structure. In Fig. Figure 7b shows a side view of the conventional valve structure. In Fig. 8 shows the hot and cold coolant flow lines in the partially open position of the conventional thermostat arrangement.

[0024] The drawings are not necessarily to scale, and details not necessary for understanding the present invention may have been omitted. Furthermore, elements that are at least substantially identical or have at least substantially identical functions are identified by the same number. Reference symbol 1. Thermostat arrangement 10. Body 10.1. Piston seat 11. Bypass inlet 12. Radiator inlet 13. Outlet 15. Thermostat interior 16 Mounting element 20. Thermoactuator 21. temperature-sensitive housing 22. Piston 23rd Ring 25. O-seal 30. Valve structure 31. Upper valve element 31.1. Ring seat 31.2. Wall 32. Valve body 32.1. Connecting wall 32.2. primary barrier wall 32.3. secondary barrier wall 32.4. Housing 32.5. Lower Inlet 32.6. Upper outlet 32.7. Mixing chamber 33. Lower valve element 33.1. Spring seat 33.2. O-ring seal groove 33.3. Extension 34. Outlet control element 35. curved surface 40. Spring element 50. Cover 51. Recess 52. Spring seat Eo. Engine exhaust Cb. Bypass channel Cr. Radiator channel Co. exhaust port Egg. Engine intake Lw. warm coolant flow line Lc. cold coolant flow line Detailed description of the invention

[0025] It relates to a thermostat assembly (1) that provides valve control depending on the temperature of the thermostat outlet (13) by mixing the coolants coming from the bypass inlet (11) and the radiator inlet (12) until they reach the thermal actuator (20). This is made possible by the present valve structure (30), which allows the thermal actuator (20) to sense only the thermostat outlet temperature (13) by preventing the warm coolant flow line (Lw) and the cold coolant flow line (Lc) from coming into direct contact with the thermal actuator (20) before mixing.

[0026] Conventional thermostat assemblies enable temperature control in the engine cooling system by adjusting the coolant flow rate between the bypass circuit and the heat exchange circuit according to the temperature value of the coolant coming from the engine outlet. The coolant flow is determined by the temperature-sensitive housing of the thermal actuator in the thermostat assembly. The temperature-sensitive housing allows the temperature of the engine outlet coolant to be detected through the heat transfer provided along the housing wall between the wax compound in the chamber and the coolant coming from the engine outlet. An increase in the wax temperature causes an increase in the wax volume; conversely, a decrease in the wax temperature causes a decrease in the wax volume.The volume change in the wax compound causes the piston to move forward and backward, thus causing the valve structure, which is guided by the thermoactuator, to move back and forth. This provides coolant flow control between the bypass circuit and the coolant circuit according to the valve position, which is determined by the coolant temperature coming from the engine outlet. This is possible thanks to the structural features of the thermostat arrangement with two inlets and one outlet, which ensures direct contact between the warm coolant flow line and the temperature-sensitive housing part. In conventional thermostat arrangements with two inlets and one outlet, the cold coolant flow line, which runs from the radiator inlet to the outlet along the thermostat interior, either does not come into contact with the temperature-sensitive housing at all or only tangentially.Therefore, the displacement of the thermocouple-guided valve structure is primarily determined by the temperature value of the warm coolant flow line from the bypass inlet to the outlet along the interior of the thermostat. However, in this case, it is not possible to manage the engine outlet coolant temperature values ​​as desired by the manufacturer. Since the temperatures of the thermostat outlet coolant and the engine inlet coolant are the same, it is important to provide valve control according to the thermostat outlet temperature to manage the engine inlet temperature values.

[0027] The present invention relates to a thermostat assembly (1) comprising a valve structure (30) that allows the thermal actuator (20) to sense only the thermostat outlet temperature (13) by preventing the warm coolant flow line (Lw) and the cold coolant flow line (Lc) from directly contacting the thermal actuator (20) before they are mutually mixed.

[0028] The present thermostat assembly (1) comprises a preferably tubular body (10) having a bypass inlet (11) and a cooler inlet (12) to allow the inlet of the coolants; a mixing chamber (32.7) provided so that the coolants flowing from the bypass inlet (11) and a cooler inlet (12) in said body (10) are collected for mixing; an outlet (13) arranged on the body (10) to provide the outlet of coolants to the mixing chamber (32.7) after mixing; the valve structure (30) arranged internally so that it can slide within said body (10);a thermal actuator (20) having a temperature-sensitive housing (21) containing wax in the valve body (32) for displacing the valve structure (30) in response to the temperature of the coolant mixture in the mixing chamber (32.7), and a piston (22) having one end connected to the body (10) so that it cannot displace in its own direction of displacement, and the other end located in the temperature-sensitive housing (21); a spring element (40) positioned to apply a force to displace said valve structure (30) in the opposite direction to the displacement provided by the thermal actuator (20);lower and upper radiator valve elements (31, 33) arranged to control the amount of coolant flowing to said valve structure (30) by at least partially opening or closing the bypass inlet (11) and a radiator inlet (12) as the valve structure (30) translates within the body; a primary barrier wall arranged to cover at least part of the periphery of the thermal actuator to prevent said valve from coming into contact with the temperature-sensitive housing before the coolant coming from the bypass or the radiator inlet reaches the mixing chamber;

[0029] In the preferred embodiment, the primary barrier wall (32.2) is arranged to prevent the coolant coming from the bypass inlet (11, 12) from contacting the temperature-sensitive housing (21) before reaching the mixing chamber (32.7).

[0030] Various perspective views of the present valve structure (30) are shown in Fig. 1a and Fig. 1b. The upper valve element (31) of the valve structure (30) controls the amount of warm coolant flow coming from the bypass channel (Cb) by changing the opening rate of the bypass inlet (11). The lower valve element (33) of the valve structure (30) controls the amount of cold coolant flow coming from the radiator channel (Cr) by changing the opening rate of the radiator inlet (12).

[0031] The upper and lower valve elements (31, 32) are arranged so that they can be brought together within the body (10) of the thermostat assembly (1). They are thus connected to one another.

[0032] The two valve elements (upper and lower) are preferably connected to each other via two opposing connecting walls (32.1), which form the valve body (32). The ring (23) of the thermoactuator (20) is arranged on the ring seat (31.1) of the upper valve element (31). Thus, the upper valve element (31) and the lower valve element (33) can be guided simultaneously as a single body through the thermoactuator (20).

[0033] The primary and secondary barrier walls (32.2, 32.3) are arranged so that they are planar structures in the axial direction, while the connecting walls (32.1) extend in the axial direction but are designed in a curved shape corresponding to the body (10).

[0034] In relation to Fig. 2a; The upper valve element (31) comprises a part extending radially at the upper part of the upper part of the valve body (32), and a wall (31.2) at the end of this part, extending perpendicular to this part. The wall (31.2) is in particular arranged such that it at least partially, preferably completely, covers the bypass inlet (11). The part extending radially is used as the annular seat part (31.1). The annular part (23) of the thermoactuator (20) sits on the annular seat (31.1), and the temperature-sensitive housing (21) extends from the annular seat (31.1) to the inner part of the valve structure (30) to the mixing chamber (32.7).

[0035] Furthermore, in this embodiment of the present valve structure (30), the lower valve element (33) also comprises an extension (33.3) extending radially from the valve body (32), preferably in an annular shape. The extension (31.3) is in particular arranged such that it at least partially, preferably completely, covers the cooler inlet (12). As shown in Fig. As can be seen in Figure 3a, the end portion of the extension (31.3) is arranged in section, and accordingly, the end portion of the radiator inlet (12) is also arranged in section. It consists of an O-seal groove (33.2) and a spring seat (33.1) on the lower valve element (33). In the fully closed position of the thermostat assembly (1), the insulation between the coolant in the thermostat interior (15) and the coolant at the radiator inlet (12) is provided by the O-seal (25) arranged in the O-seal groove (33.2).

[0036] As in Fig. 1a, the primary barrier wall (32.2) in the valve structure (30) is provided in the upper area of ​​the cooler inlet part. As shown in Fig. As can be seen in Figure 6, the primary barrier wall (32.2) ensures that the warm coolant coming from the bypass channel (Cb) through the bypass inlet (11) flows from the bypass inlet (11) to the lower inlet (32.5). Thus, direct contact between the warm coolant flow line (Lw) coming from the bypass inlet (11) and the temperature-sensitive chamber part (21) of the thermal actuator (20) is prevented.

[0037] In the preferred embodiment of the invention, as shown in Fig. As shown in Figures 1a-1b, a secondary barrier wall is formed together with the primary barrier wall (32.2) between the two connecting walls (32.1) of the valve structure (30) in the lower region of the cooler outlet (32.3). Due to the presence of the second barrier wall (32.3), an upper inlet (32.6) is formed at the upper part of the secondary barrier wall (32.3).

[0038] Furthermore, a mixing chamber (32.7) is formed between the primary barrier wall (32.2) and the secondary barrier wall (32.3), and preferably together with the two connecting walls (32.1). Thus, the mixing chamber (32.7) is provided within the valve structure (30).

[0039] A side view of the present valve structure (30) together with the thermoactuator (20) is shown in Fig. 2. This mixing chamber (32.7) is clearly visible in this image. Unlike conventional valve structures, in the present valve structure (30), the warm coolant and the cold coolant are thoroughly mixed thanks to the mixing chamber (32.7). Thus, the temperature of the thermostat outlet (13) is maintained in the mixing chamber (32.7). Therefore, the thermoactuator (20) detects the temperature of the coolant mixture and acts depending on the temperature of the thermostat outlet (13). As shown in Fig. As shown in Figure 6, the secondary barrier (32.3) ensures that the coolant mixture flows from the mixing chamber (32.7) to the upper outlet (32.6). This prevents the hot and cold coolants from flowing directly from the mixing chamber (32.7) to the outlet (13) before being mixed in the mixing chamber (32.7).

[0040] In a preferred embodiment of the invention, a curved surface (35) is arranged in the part where the upper inlet (32.6) is provided at the end portion of the second barrier wall (32.3). The coolants filling the mixing chamber (32.7) flow over the curved surface (35) to the outlet (13) by passing through the upper inlet (32.6). Here, the curved surface (32) prevents the formation of turbulence by preventing the coolant from flowing directly into the outlet (13).

[0041] Various side sectional views of the present thermostat arrangement (1) are shown in the Fig. 3a and Fig. 3b. These side views correspond to the partially open position of the thermostat device (1). When the temperature of the coolant coming from the bypass channel (Cb) exceeds the first threshold temperature of the thermoactuator (20), the piston structure (22) inside the thermoactuator (20) begins to move forward. However, the limited displacement capacity of the piston (22) due to the fixed position of the piston seat (10.1) causes the other parts of the thermoactuator (20) to move backward. The backward displacement of the thermoactuator (20) causes the valve structure (30) to also move backward. Thus, the thermostat assembly (1) moves from a fully closed position to a partially open position.In the partially open position, the thermostat assembly (1) allows both the warm coolant coming from the bypass inlet (11) and the cold coolant coming from the radiator inlet (12) to flow through the thermostat interior (15). The spring element (40) is arranged between the part of the spring seat (52) of the cover (50) and the part of the spring seat (33.1) of the lower valve element (33). The spring element (40) generates the force required for the valve structure (30) to move upwardly during the transition of the valve structure (30) from the open position to the closed position. The spring element (40) is continuously arranged in a tendency to exert a force in the direction opposite to the thrust direction of the piston (21).

[0042] In relation to Fig. 4a and Fig. 4b; The body (10) is tubular, and the bypass and cooler inlets (11, 12) and the outlet (13) are arranged in tubular form. Here, the bypass and cooler inlets (11, 12) are located at the bottom and face in the same direction. The outlet (13) is located on the opposite side in the opposite direction.

[0043] A front view and a perspective view of the present thermostat assembly (1) are shown in the Fig. 4a and 4b, respectively. As can be seen from these figures, there are two mounting elements (16) in this preferred embodiment of the present invention.

[0044] A top view and an exploded perspective of the present thermostat assembly (1) are shown in the Fig. 5a and Fig. 5b.

[0045] A preferred embodiment of the invention comprises a thermal actuator (20) with a body (10) having a bypass inlet (11), cooler inlet (12), outlet (13), temperature-sensitive housing (21), piston (22) and ring parts (23), a tubular valve structure (30) with valve body parts (32) consisting of the upper valve element (31), the lower valve element (33) and the two opposite connecting walls (32).1) connecting the upper valve element (31) and the lower valve element (33) to each other, a cover (50) with a recess (51) comprising an O-seal (25), a spring element (40), a spring seat (52)Thermostat arrangement (1) comprising a wax-based material, which enables valve control depending on the temperature of the thermostat outlet (13) by mixing the coolants coming from the bypass inlet (11) and the radiator inlet (12) up to the thermoactuator (20), to provide that the thermoactuator (20) can only detect the temperature of the thermostat outlet (13) by preventing direct contact of the thermoactuator (20) with the part of the temperature-sensitive housing (21); before the warm coolant flow line (Lw) from the bypass channel (Cb) and the cold coolant flow line (Lc) from the radiator channel (Cr) mix;. a primary barrier wall (32.2) formed between two connecting walls (32.1) of the valve structure (30) in the upper region of the cooler inlet part such that the hot coolant can flow from the bypass inlet (11) to the lower inlet (32.5) without directly touching the thermal actuator (20), a secondary barrier wall (32.3) formed between two connecting walls (32.1) of the valve structure (30) in the lower region of the cooler outlet part and comprising a mixing chamber (32.7) together with the primary barrier wall (32.2) in such a way that the hot and cold coolants can flow from the mixing chamber (32.7) to the upper outlet (32.6) after mixing in the mixing chamber (31.7).

[0046] Fig.Figure 6 shows the coolant flow mechanism of a cooling system incorporating the present thermostat assembly (1). As also shown in the figure, the main intake cooler coming from the engine exhaust (Eo) is divided between the bypass passage (Cb) and the radiator passage (Cr) depending on the valve opening amount. The coolant flowing along the radiator passage (Cr) is cooled by the radiator. In the fully closed position of the valve structure (30), the warm coolant coming from the bypass passage (Cb) can flow through the interior of the thermostat (15). When the temperature of the warm coolant exceeds the first threshold value of the thermal actuator (20), the cold coolant coming from the radiator passage (Cr) as well as the warm coolant can flow through the interior (15) of the thermostat.In this partially open position of the thermostat assembly (1), the warm coolant flow line (Lw), emerging from the bypass channel (Cb) via the bypass inlet (11), is intended to flow through the lower inlet (32.5) through the primary barrier wall (32.2). Thus, the warm coolant flow line (Lw) and the cold coolant flow line (Lc) converge at the lower inlet (32.5). They then mix in the mixing chamber (32.7). Since the temperature of the coolant mixture and the temperature of the thermostat outlet (13) are the same, the thermoactuator (20) can guide the valve structure (30) depending on the temperature of the thermostat outlet (13). The coolant mixture exiting the thermostat outlet (13) flows through the outlet channel (Co) along the engine passages, entering from the engine inlet (Ei).

Claims

[1] Wax-based thermostat assembly (1) for regulating the coolant temperature in engine assemblies, characterized by that it includes: a tubular body (10) having a bypass inlet (11) and a cooler inlet (12) for the inlet of coolant flows; a mixing chamber (32.7) provided such that the coolant flows flowing through the bypass inlet (11) and the cooler inlet (12) in said body (10) come together for mixing; an outlet (13) arranged on the body (10) for providing the outlet of the mixing chamber (32.7) after mixing of the coolant streams; a valve structure (30) arranged internally so as to be displaceable within said body (10); a thermal actuator (20) with a temperature-sensitive housing (21) containing wax in the valve body (32) for displacing the valve structure (30) in response to the temperature of the coolant mixture in the mixing chamber (32.7), and a piston (22) having one end connected to the body (10) so that it cannot displace in its own direction of displacement and the other end located in the temperature-sensitive housing (21); a spring element (40) positioned to apply a force to displace said valve structure (30) in the opposite direction to the displacement provided by the thermal actuator (20); lower and upper radiator valve elements (31, 33) arranged to control the amount of coolant flowing onto said valve structure (30) by at least partially opening or closing the bypass inlet (11) and the radiator inlet (12) be closed when the valve structure (30) moves within the body; a primary barrier wall (32.2) arranged to cover at least part of the periphery of the thermal actuator to prevent said coolant from coming into contact with the temperature-sensitive housing before the coolant flow coming from the bypass or cooler inlet reaches the mixing chamber; and a secondary barrier wall (32.3) designed to allow the coolant streams to flow from said mixing chamber (32.7) to the outlet (13) after they have mixed together in the mixing chamber (32.7). [2] A thermostat arrangement (1) according to claim 1, characterized by that said upper valve element (31) comprises an annular seat (31.1) extending radially towards the bypass inlet (11) and a wall (31.2) perpendicular to the annular seat (31.1) to partially cover the bypass inlet (11). [3] A thermostat arrangement (1) according to claim 1 or 2, characterized by in that said lower valve element (33) comprises an extension (33.3) extending radially from the bottom of the valve body (32) and capable of at least partially closing the radiator inlet (12). [4] A thermostat arrangement (1) according to one of claims 1 to 3, characterized by that the part of said secondary barrier wall (32.3) which transfers the coolant mixture to the outlet (13) is arranged as a curved surface (35) to prevent the coolant mixture from forming turbulence as it flows to the outlet. [5] A thermostat arrangement (1) according to claim 4, characterized by that said mixing chamber (32.7) is provided between the primary barrier wall (32.2) and the secondary barrier wall (32.3). [6] A thermostat assembly (1) according to any one of claims 1-5, further comprising two connecting walls (32.1) connecting the primary and secondary barrier walls (32.2, 32.3) together. [7] A thermostat arrangement (1) according to claim 6, characterized by that said mixing chamber (32.7) is provided between the primary barrier wall (32.2) and the secondary barrier wall (32.3) and the connecting walls (32.1). [8] A thermostat arrangement (1) according to claim 1, characterized by in that it comprises an attachable cover (50) at the base of said body (10) which includes a spring seat (52) where the spring element (40) can be placed. [9] A thermostat arrangement (1) according to one of the preceding claims, characterized by that the valve body (32) is tubular.

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