IL266434A

IL266434A - Fast response wax based actuator

Info

Publication number: IL266434A
Application number: IL266434A
Authority: IL
Original assignee: Kirpart Otomotiv Parcalari Sanayi Ve Ticaret A S
Priority date: 2016-11-02
Filing date: 2019-05-02
Publication date: 2019-06-30
Also published as: WO2018084821A3; TR201615622A2; WO2018084821A2; IL266434B

Description

1 DESCRIPTION FAST RESPONSE WAX BASED ACTUATOR TECHNICAL FIELD The present invention relates to wax based actuator for cooling circulation of the internal combustion engines which has fast response time.

PRIOR ART In internal combustion engines, it is important to keep the engine temperature around designed value with regards to combustion efficiency and progressing emission rates. The slower response time is the longer stabilization time for reaching targeted engine temperature which means inefficient fuel combustion and higher emission rates.

In the known state of the art, wax based actuators are main control devices of the cooling circulation units with liquid coolant and thermal actuators are main control devices. Wax compound pellet is filled inside a cylindrical vessel and captured inside this vessel by means of an elastomeric seal and a cover. All wax amounts captured inside should be heated or cooled from outside by the coolant circulating in the engine. This heating and cooling take an amount of time (whole wax compound should be at the same temperature) which is called the response time of the wax compound which affects the response time of the wax based actuator.

In WO9723740 disclosed a known thermal actuator includes a capsule, which contains a diaphragm controlling the position of a stem. A thermal expansion substance like wax is contained in the capsule which operates as a thermostat in a thermostatically controlled valve such as a thermostatically controlled mixing valve.

The stem of the actuator is connected with a valve body movable between two valve seats for hot and cold medium, respectively, and the capsule is placed in the area of the mixed medium for transmitting the heat of the mixed medium to the thermal expansion substance. In order to present a simple and more effective actuator that2 can react promptly at changes of temperature and which does not require an extra temperature sensor, the capsule consists of an oblong cup-like sensor body, the surface of which is at least partly in such a way that its thermal transmittance area is increased.

In EP942347 disclosed a thermostat element has an elongated cap forming a chamber housing a material that expands and contracts with changing temperature, displacing a piston at the end of the cap. The side wall of the cap has flats or depressions distributed round the cap, forming a lobed cross-section that almost closes onto an axial rod which has good thermal conduction.

BRIEF DESCRIPTION OF THE INVENTION The present invention relates to a wax based actuator for eliminating the above mentioned disadvantages and for bringing new advantages to the related technical field.

An object of the present invention is to provide a wax based actuator where the response time is reduced.

Another object of the present invention is to provide a wax based actuator where the productivity is increased.

Another object of the present invention is to provide a wax based actuator which is easily applicable.

In order to realize all of the abovementioned objects and the objects which are to be deducted from the detailed description below, the present invention is A wax based actuator, which is used in cooling circulation of internal combustion engines, comprising a piston, a cover which at least partially covers said piston, a vessel embodied in a hollow cylindrical form whereon said cover is positioned, a wax compound pellet placed to the inner side of the vessel and a diaphragm extending into the cover from one end and extending into the wax compound pellet from the other end. Accordingly, the present invention is characterized by comprising a3 cylindrical core filler placed in a manner providing positioning of the wax compound pellet between the vessel and the core filler in order to reduce the response time of wax based actuator. Thus, a wax compound pellet, which is in sleeve structure and having a thickness equal to the distance between the core filler and the vessel, is obtained, and the thickness of the wax compound pellet is reduced. By means of this, the thermal reaction time of the wax compound pellet is reduced and thus the response time is reduced.

In a preferred embodiment of the subject matter invention, the core filler comprises a diaphragm housing embodied on the top end point of the core filler facing the diaphragm.

In another preferred embodiment of the subject matter invention, the diaphragm housing is embodied in a semi-spherical hole form.

In another preferred embodiment of the subject matter invention, the core filler comprises at least two centering teeth provided on bottom and on bottom end points of lateral surfaces. Thus, core filler assembled inside said vessel coaxially.

In another preferred embodiment of the subject matter invention, core filler comprises six centering teeth provided on bottom and on bottom end points of lateral surfaces.

In another preferred embodiment of the subject matter invention, core filler is made of a thermally conductive material which is selected from polymeric or metallic material.

In another preferred embodiment of the subject matter invention, wax compound pellet is made of a thermally sensitive material which is able to expand or shrink depending on temperature change.

In another preferred embodiment of the subject matter invention, diaphragm is produced by an elastomeric compound.4 In another preferred embodiment of the subject matter invention, diaphragm is produced by a rubber material.

In another preferred embodiment of the subject matter invention, cover which has a protrusion which is in fact a gradually enlarging diameter on the bottom end point of cover.

In another preferred embodiment of the subject matter invention, vessel comprises a gradually increasing diameter which is embodied at the end point of vessel and which bends over the protrusion of cover. Thus wax based actuator is sealed.

In another preferred embodiment of the subject matter invention, a diaphragm which has an enwrapping geometry for piston and which has compressing protrusions.

BRIEF DESCRIPTION OF THE FIGURES In figure 1; a general representative view of fast response wax based actuator is given.

In figure 2; cross-sectional view of fast response wax based actuator is given In figure 3; exploded view of fast response wax based actuator is given In figure 4; cross sectional view of core filler is given In figure 5; 3D view of core filler is given In figure 6; 3D view of core filler is given In figure 7; 3D view of core filler with 6 teethes is given In figure 8a; cross-sectional view of wax compound pellet with core filled is given In figure 8b; cross-sectional view of wax compound pellet regular cylindrical shaped is given5 REFERENCE NUMBERS 1 Wax based actuator 2 Piston 3 Cover 31 Cover guiding hole 32 Protrusion 4 Diaphragm 41 Diaphragm guiding hole 42 Guiding surface Wax compound pellet 6 Core filler 61 Diaphragm housing 62 Centering teeth 7 Vessel 71 Gradually increasing diameter THE DETAILED DESCRIPTION OF THE INVENTION In this detailed description, the subject matter; a wax based actuator (1) is explained with references to examples without forming any restrictive effect only in order to make the subject more understandable. This invention relates to said wax based actuator (1) for cooling circulation units of internal combustion engines and which is implemented for achieving fast response.

In the subject matter invention, it is aimed to provide decreased thickness of wax for the same amount of wax compared with the known state of the art with easy applicability.

With reference to figure 1; the wax based actuator (1) essentially comprises a piston (2), a cover (3) which at least partially encircles said piston (2); a wax compound pellet (5) placed below to said cover (3); a diaphragm (4) which extends into the cover (3) from one end and extends into said wax compound pellet (5) from other6 end; a core filler (6) placed into the wax compound pellet (5), and a vessel (7) covering the wax compound pellet (5) and relating with the cover (3).

Cover (3) has a hollowed cylindrical geometry which has a vertical cover guiding hole (31) to guide the piston (2). Cover guiding hole (31) has a diameter which is enough to allow the piston (2) pass through. Cover (3) has at least one protrusion (32) for locking to the vessel (7) on the bottom end point. Cover (3) is placed above the diaphragm (4). Top end point of the cover (3) has a frusto-conical geometry. Inner surface of the cover (3) corresponds to outer surface of diaphragm (4). Cover (3) is encapsulated by a gradually increasing diameter (71) over the protrusion (32) of the cover (3). And thereby; wax based actuator (1) is sealed.

Diaphragm (4) has a diaphragm guiding hole (41) and a guiding surface (42) so that the piston (2) and core filler (6) are guided. Said guiding surface (42) contact the diaphragm housing (61) of the core filler (6). Diaphragm (4) has an enwrapping geometry and has compressing protrusions. Diaphragm (4) is produced by an elastomeric compound and not only provides sealing for the wax compound pellet (5) but also helps transferring the force by bending bidirectionally. Preferably diaphragm (4) is produced by a rubber material.

Wax compound pellet (5) is placed inside the vessel (7). Wax compound pellet (5) is made of a thermally sensitive material which is able to expand or shrink depending on temperature change. Wax compound pellet (5) is expandable proportionally to the temperature and is captured inside the vessel (7). In case temperature increases, wax compound pellet (5) expands and starts to push the piston (2). Providing proper thickness for wax compound pellet (5) for the whole mass of wax placed in vessel (7) should be properly determined regarding the efficiency and applicability.

Piston (2) passes through said cover guiding hole (31) and said diaphragm guiding hole (41) and thus it is seated to the core filler (6) from one end. Piston (2) is a metal cylindrical rod which transforms the volumetric expansion into a lifting force. Thanks to the above mentioned structure, lifting the piston (2) is facilitated by means of the force formed by the extension of the wax compound pellet (5) captured inside the vessel (7).7 The core filler (6) is placed inside the vessel (7) and large amount of the volume inside the vessel (7) is filled by said core filler (6). Remaining volume is filled by the wax compound pellet (5) around this filler as a thin layer between vessel (7) and core filler (6). This structure is captured by the diaphragm (4) and the cover (3) and the piston (2) passing through the cover (3). Diameter of the core filler (6) is smaller than the inner diameter of the vessel (7). Thereby; a sleeve structured wax compound pellet (5) is created between vessel (7) and core filler (6). Length of the core filler (6) is shorter than length of the vessel (7).

Core filler (6) has a cylindrical geometry. Top surface of core filler (6) has diaphragm housing (61) which is a semi-spherical hole. Core filler (6) has at least three centering teeth (62) on bottom and on bottom end points of lateral surfaces. By means of these centering teeth (62), the vessel (7) and the core filler (6) are provided to be coaxial.

Preferably core filler (6) has 6 centering teeth (62).

Core filler (3) is made of a thermally conductive material which is selected from polymeric or metallic material. In one embodiment of the invention; core filler (3) is made of a polymeric especially plastic material. Another embodiment of the invention; core filler (3) is made of metallic material. So that response time is reduced.

The vessel (7) has cylindrical geometry which has said gradual increasing diameter (71) which enlarges on the end points and which locks the cover (3) by bending over.

Vessel (7) seals the wax compound pellet (5), core filler (6) and diaphragm by encaging them with cover (3). The gradually increasing diameter (71), which is the end point of vessel (7) and has slightly greater diameter than the vessel (7), bends over the protrusion (32) of cover (3) so that encaging is provided.

This assembly is the controller of cooling circulation system of internal combustion engines. It controls the circulation by lifting piston (2) and any engaged valve by means of lift force created by the expansion of wax compound pellet (5) in case temperature increases. In a similar manner in case temperature decreases, expanded wax compound pellet (5) shrinks and piston (2) is pushed back. This8 expansion and shrinkage takes an amount of time called response time of wax compound pellet (5) which is directly affecting the response time of actuator. All amount of the wax compound pellet (5) should be at the same temperature so that expansion or shrinkage should start. By using core filler (6) wax compound pellet (5) with thin layer between the core filler (6) and vessel (7) is heated so that response time of wax compound pellet (5) is shortened when compared with the conventional thick pellet since the delays for heat transfer to thick wax pellet is avoided.

Thanks to the present invention, a thermal actuator is obtained which has proper wax thickness by means of the core filler (6) assembled inside the cylindrical vessel (7).

So that proper heat transfer is provided for whole wax compound and response time of wax compound is shortened.

The protection scope of the present invention is set forth in the annexed claims and cannot be restricted to the illustrative disclosures given above, under the detailed description. It is because a person skilled in the relevant art can obviously produce similar embodiments under the light of the foregoing disclosures, without departing from the main principles of the present invention.11 ABSTRACT FAST RESPONSE WAX BASED ACTUATOR A wax based actuator (1), which is used in cooling circulation of internal combustion engines, comprising a piston (2), a cover (3) which at least partially covers said piston (2), a vessel (7) embodied in a hollow cylindrical form whereon said cover (3) is positioned, a wax compound pellet (5) placed to the inner side of said vessel (7) and a diaphragm (4) extending into the cover (3) from one end and extending into the said wax compound pellet (5) from the other end; characterized by comprising a cylindrical core filler (6) placed in a manner providing positioning of the wax compound pellet (5) between the vessel (7) and the core filler (6).

Figure 19

Claims

1. A wax based actuator (1), which is used in cooling circulation of internal combustion engines, comprising a piston (2), a cover (3) which at least 5 partially covers said piston (2), a vessel (7) embodied in a hollow cylindrical form whereon said cover (3) is positioned, a wax compound pellet (5) placed to the inner side of said vessel (7), a diaphragm (4) extending into the cover (3) from one end and extending into the mentioned wax compound pellet (5) from the other end and, a cylindrical core filler (6) positioned within said wax 10 compound pellet (5) in a manner providing positioning of the wax compound pellet (5) between the vessel (7) and the core filler (6); characterized in that; mentioned cylindrical core filler (6) comprises - a diaphragm housing (61) embodied in a semi-spherical hole form on the top end point of the core filler (6) facing the diaphragm (4), 15 - at least three centering teeth (62) provided on bottom part of the core filler (6) and - at least three centering teeth (62) provided on bottom end points of lateral surfaces of the core filler (6). 20

2. A wax based actuator (1) according to claim 1 characterized in that; core filler (3) is made of a thermally conductive material which is selected from polymeric or metallic material.

3. A wax based actuator (1) according to claim 1 characterized in that; wax 25 compound pellet (5) is made of a thermally sensitive material which is able to expand or shrink depending on temperature change.

4. A wax based actuator (1) according to claim 1 characterized in that; diaphragm (4) is produced by an elastomeric compound. 30

5. A wax based actuator (1) according to claim 7 characterized in that; diaphragm (4) is produced by a rubber material.10

6. A wax based actuator (1) according to claim 1 characterized by cover (3) which has a protrusion (32) which is in fact a gradually enlarging diameter on the bottom end point of cover (3). 5

7. A wax based actuator (1) according to claim 1 characterized by vessel (7) comprising a gradually increasing diameter (71) which is embodied at the end point of vessel (7) and which bends over the protrusion (32) of cover (3). 10

8. A fast response wax based actuator (1) according to claim 1 characterized by a diaphragm (4) which has an enwrapping geometry for piston (2) and which has compressing protrusions.