KR20110007879A - Composite form injection nozzle of freezing prevention - Google Patents

Abstract

PURPOSE: A composite injection nozzle for freezing prevention is provided to increase engine efficiency since one outer end of a conductive and one end of an insulating pipe are not formed on the same line and thus freezing does not occur on an injection nozzle. CONSTITUTION: A composite injection nozzle for freezing prevention comprises an insulating pipe(10) and a conductive pipe(20). When LPG fuel is supplied through an injector, the insulating pipe prevents the heat due to the engine operation from becoming transferred and maintains the LPG fuel in a liquid state. The conductive pipe comprises a through hole(21) in a longitudinal direction so that the insulating pipe is coupled to the inside of the conductive pipe. The conductive pipe comprises a concave groove(26) on an outer surface, to which the LPG fuel is sprayed, to be communicated with the through hole. The intake air of the engine is again circulated on the concave groove and the moisture is not applied and thus freezing does not occur.

Description

Composite form injection nozzle of Freezing prevention

The present invention relates to a composite spray nozzle for preventing freezing, and more particularly, the outer end surface of the heat conduction pipe and one end surface of the heat insulating pipe coupled to the inside are not formed in the same line, so that freezing does not occur in the spray nozzle. As a result, the efficiency of the engine is increased, and the engine or the fuel supply engine can be prevented from being damaged due to the conventional freezing fragments, and concave grooves are formed in the outer surface of the heat conduction pipe through which the LLP fuel is injected through the heat insulating pipe. In order to prevent the intake air sucked into the engine to flow secondly in the concave groove to prevent water supply and to freeze, and to prevent the engine or fuel supply engine from being damaged due to the freezing fragments generated by the freezing phenomenon. The present invention relates to a composite spray nozzle for preventing freezing, which increases the engine efficiency.

The LPI (Liquefied Petroleum Injection) system, which has been recently developed and applied, is a technology that injects fuel by cylinder using an injector by liquefying liquefied petroleum gas (LPG) fuel under high pressure.

In general, LPG liquid phase LPG injection (LPLI) is a state-of-the-art vehicle LPG fuel supply method that has been actively used since 1994 in developed countries (Europe, mainly in the Netherlands).

By pumping LPG at high pressure and electrospraying it with a dedicated injector, more precise fuel control, higher efficiency and reduced emissions can be achieved. Therefore, it is a technology that must be used to satisfy the exhaust gas regulation value of LPG vehicles in the future, and in 2003, Hyundai-Kia Motors completed the development of a vehicle using this LPLi method and commercialized it.

In the LPG liquid injection type fuel system, LPG fuel having a low boiling point (-42 ° C) vaporizes into the liquid phase and vaporizes at the nozzle mounting part of the engine, thereby taking away the heat of the surroundings. Phenomena occur, and the generated ice may fall off or block the inlet of the fuel injection nozzle, causing great damage to the engine or hindering normal combustion. Therefore, in order to prevent such icing phenomenon, a commercially available LPG liquid injection fuel system is provided with a fuel injection nozzle having a double structure.

As shown in FIG. 2, the nozzle of the conventional LPI liquid jet injector includes a nylon tube 4 made of nylon through which fuel passes, and an outer heat conductive tube 5 of the same material is wrapped around the nylon tube 4. An air layer is formed between the nylon tube 4 and the heat conductive tube 5 to prevent direct contact between the heat conductive tube 5 and the heat conductive tube 5 to prevent freezing occurring at the injector nozzle 2 at high humidity in the subzero region. .

That is, the role of the nozzle 2 of the LLP liquid injection injector 1 having the structure as described above will be described in more detail with reference to FIG. 1, wherein the nylon tube 4 has a surrounding liquid to maintain the liquid phase. The heat conduction tube (5) is formed outside of the nylon tube (4) and heat transfers well around to melt ice crystals formed by icing at the inlet of the nozzle (2) of the injector (1). The air layer 3 is formed between the nylon tube 4 and the heat conductive tube 5 to block direct contact between the two tubes to prevent vaporization of the fuel inside the nylon tube 4.

However, in the nozzle 2 of the conventional liquid injection injector made as described above, the outer surface of the heat conduction tube and the outer surface of the nylon tube are formed in the same line when the liquid LLP fuel is supplied to the engine through the inside of the nylon tube. At this time, the nylon tube is a material with low thermal conductivity, the freezing occurs on the outer surface of the nylon tube, according to the fuel contained in the freezing according to the increase in fuel consumption, thereby lowering the air-fuel ratio of the engine to reduce the engine efficiency Occurs.

In addition, the freezing falls into pieces at the boundary between the heat conduction pipe and the nylon pipe, which causes a problem that the engine or the fuel supply engine may be damaged.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems,

The outer end face of the heat conduction pipe and one end face of the heat insulating pipe coupled to the inside are not formed in the same line, so that freezing does not occur in the injection nozzle, thereby increasing the efficiency of the engine, and the engine or fuel due to the conventional freezing pieces. An object of the present invention is to provide a composite spray nozzle for preventing freezing, which can prevent the supply pipe from being damaged.

In addition, by forming a concave groove on the outer surface of the heat conduction pipe in which the LLP fuel is injected through the heat insulating tube, the intake air sucked into the engine is secondary flow in the concave groove to prevent the water supply to the surroundings to prevent freezing Another object of the present invention is to provide a composite injection nozzle for preventing freezing, which increases the efficiency of the engine by preventing the engine or fuel supply engine from being damaged due to the freezing fragments generated by the freezing phenomenon.

In order to achieve the above object, the present invention provides an injector injection nozzle for supplying a liquid LLP fuel to the engine,

An insulating tube for maintaining and conveying the LLP fuel in a liquid state so that heat is not transmitted according to the operation of the engine when the LLP fuel is supplied to the engine through the injector;

The through-hole is formed in the longitudinal direction so that the heat insulated tube is coupled therein, and a concave groove is formed on the outer surface through which the LLP fuel is injected, and the intake air of the engine is secondary flow in the concave groove. At the same time, while preventing moisture from being circumferentially prevented from being frozen, the end surface of the heat insulating tube is provided inside the through hole, so that no release material is formed on the outer surface to prevent freezing from occurring in the spray nozzle. And a heat conduction tube formed of a thermally conductive material and receiving heat generated from the engine to suppress occurrence of freezing.

As described above, in the composite spray nozzle for preventing icing of the present invention, the outer end surface of the heat conduction tube and one end surface of the heat insulating tube coupled to the inside are not formed in the same line, so that freezing does not occur in the spray nozzle. As a result, the efficiency of the engine increases, and there is an effect of preventing the engine or the fuel supply engine from being damaged due to the conventional crushed pieces.

In addition, by forming a concave groove on the outer surface of the heat conduction pipe in which the LLP fuel is injected through the heat insulating tube, the intake air sucked into the engine is secondary flow in the concave groove to prevent the water supply to the surroundings to prevent freezing In addition, the efficiency of the engine is increased by preventing the engine or the fuel supply engine from being damaged by the ice chips generated by the freezing phenomenon.

The present invention has the following features to achieve the above object.

The present invention provides an injector injection nozzle for supplying a liquid fuel LLP to the engine,

An insulating tube for maintaining and conveying the LLP fuel in a liquid state so that heat is not transmitted according to the operation of the engine when the LLP fuel is supplied to the engine through the injector;

The through-hole is formed in the longitudinal direction so that the heat insulated tube is coupled therein, and a concave groove is formed on the outer surface through which the LLP fuel is injected, and the intake air of the engine is secondary flow in the concave groove. At the same time, while preventing moisture from being circumferentially prevented from being frozen, the end surface of the heat insulating tube is provided inside the through hole, so that no release material is formed on the outer surface to prevent freezing from occurring in the spray nozzle. And a heat conduction tube formed of a heat conductive material and receiving heat generated from the engine to suppress generation of freezing.

The present invention having such characteristics can be more clearly described by the preferred embodiments thereof.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. Prior to this, terms or words used in the specification and claims should not be construed as having a conventional or dictionary meaning, and the inventors should properly explain the concept of terms in order to best explain their own invention. Based on the principle that can be defined, it should be interpreted as meaning and concept corresponding to the technical idea of the present invention.

Therefore, the embodiments described in the specification and the drawings shown in the drawings are only the most preferred embodiment of the present invention and do not represent all of the technical idea of the present invention, various modifications that can be replaced at the time of the present application It should be understood that there may be equivalents and variations.

3 is a perspective view showing a spray nozzle according to a first embodiment of the present invention, Figure 4 is a cross-sectional view showing a spray nozzle according to a first embodiment of the present invention.

As shown in Figures 3 and 4, the composite injection nozzle for preventing icing of the present invention is connected to one end of the injector 1, the heat insulating tube 10 and the heat conductive tube 20 so as to supply the liquid fuel LLP to the engine It consists of.

The heat insulated pipe 10 is a pipe that guides the transfer of the liquid liquefied fuel therein with reference to FIG. 4, which is generated by the operation of the engine when the lpage fuel is supplied to the engine through the injector 1. Heat is vaporized in the liquid phase when the heat is transferred to the Elpji fuel is formed of a plastic material such as nylon so as not to transfer heat.

Here, the support protrusion 11 is further formed at the end of the heat insulating tube 10, the support protrusion 11 is shaken or separated when the heat insulating tube 10 is coupled to the inside of the heat conductive tube 20. The heat insulating tube 10 is supported by being inserted into the through hole 21 of the heat conducting tube 20 to prevent it from being made.

In addition, the inside of the heat insulated tube 10 is formed with a transfer hole 12 in the longitudinal direction so that the Elpji fuel is transferred, the Elpji fuel is injected through the end of the transfer hole (12).

At this time, the end surface of the heat insulating tube 10, that is, the outer surface in which the LLP fuel is injected is in line with the outer surface of the heat conduction pipe 20. If this occurs, freezing occurs on the outer surface of the heat conduction pipe 20. In order to form a concave groove 26 on the outer surface of the heat conducting pipe 20.

Description of the heat conduction pipe 20 will be described in detail below.

3 and 4, the heat conduction pipe 20 has a through hole 21 formed in a longitudinal direction at a central portion thereof so that the heat insulation pipe 10 is inserted therein, and is insulated inside the through hole 21. The pipe 10 is coupled to the outer surface (surface through which the through hole communicates) of the heat conduction tube 20 and the outer surface of the heat insulation tube 10 are formed in a straight line, which is conventionally a release material (Different materials-In the present invention, it means a material having high thermal conductivity and a material having low thermal conductivity.) Therefore, freezing occurs.

Therefore, in the present invention, the heat insulating pipe 10 is coupled to the inside of the through hole 21, so that the end surface of the heat insulating pipe 10 is not formed in the same line as the outer surface of the through hole 21, the injection nozzle 40 In order to prevent the icing (icing tip) is generated in the through-hole 21 of the heat conduction tube 20, the step 22 is formed in the inner circumference of the heat conduction tube 20, referring to FIG. It is formed in multiple stages so that one end (end end) of the heat insulation tube 10 is supported on one end surface of the step 22, and one end surface (end end surface, the surface formed with the supporting protrusion) and the heat conduction tube of the heat insulation tube 10. The outer surface of 20 is not formed on the same line.

And, in another configuration to prevent freezing, a concave groove 26 is formed on the outer surface of the heat conduction pipe 20 in which the LLP fuel is injected, the concave groove 26 is in communication with the through hole 21 do.

In addition, the concave groove 26 is formed in the inner side (on the drawing, the lower side) of the heat conduction pipe 20, the depth (D) of the concave groove 26 is a secondary flow of the intake air of the engine around The secondary flow is smoothly made in the concave groove 26 to be formed to a depth of 3 mm or more to prevent water supply to prevent freezing, and the through hole 21 communicates with the central portion of the concave groove 26. The LLP fuel is injected through the heat insulated tube 10 to be delivered to the engine via the concave groove 26. Therefore, when the concave groove 26 is connected to the end point (E) and the end point (E ') in a straight line at the center point (C), respectively, the angle between the end point (E) and the end point (E') (θ) is formed to be 90 degrees or more. That is, during injection of the Elpji fuel, the width of the concave groove 26 is manufactured by applying an angle θ so as not to be mirrored on both inner surfaces of the concave groove 26.

In this case, when the concave groove 26 is formed to inject the LPG fuel through the heat insulating tube 10, intake air sucked into the engine flows in the concave groove 26 in a secondary manner, thereby suppressing water supply to the surroundings. To prevent freezing. In this case, the secondary flow refers to the vortex phenomenon, and the intake air sucked into the engine in the concave groove 26 is vortexed to prevent moisture from collecting and preventing freezing.

In addition, the concave groove 26 is formed in a hemispherical shape in cross section so that the secondary flow of the intake air sucked into the engine is smooth.

In addition, the heat conduction pipe 20 is formed of a copper pipe made of a thermally conductive material, and heat generated from the engine is transmitted, thereby removing any frost that may occur by the heat.

In addition, the thermally conductive tube 20 is a coupling portion 23 formed with a screw thread so as to be coupled to one end of the injector 1, and the thermally conductive tube 20 is formed at the end of the coupling portion 23. It is configured to include a support 24 protruding outward so as to be supported by 1), and a protrusion 25 integrally formed on one end surface of the support 24 to be provided inside the engine or the fuel supply engine.

5 is a cross-sectional view showing a spray nozzle according to a second embodiment of the present invention. As shown in FIG. 5, the injection nozzle 40 is coupled to one end of the injector 1 and includes a heat insulating tube 10 and a heat conducting tube 20 to supply the liquid LP fuel to the engine. Since the heat insulation pipe 10 has the same structure, structure, and form as the heat insulation pipe 10 described in the first embodiment, no separate description is made.

However, the heat conduction pipe 20 has only the concave groove 26 different from the first embodiment, and the other configurations, structures, and shapes are the same.

Here, the concave groove 26 is formed in a rectangular shape in cross section so that the secondary flow of the intake air sucked into the engine is smooth.

6 is a cross-sectional view showing a spray nozzle according to a third embodiment of the present invention. As shown in FIG. 6, the injection nozzle 40 is coupled to one end of the injector 1 and includes a heat insulating tube 10 and a heat conducting tube 20 to supply the liquid LP fuel to the engine. Since the heat insulation pipe 10 has the same structure, structure, and form as the heat insulation pipe 10 described in the first embodiment, no separate description is made.

However, the heat conduction pipe 20 has only the concave groove 26 different from the first embodiment, and the other configurations, structures, and shapes are the same.

Here, the concave groove 26 is formed in a polygonal cross-sectional shape so that the secondary flow of the intake air sucked into the engine is smooth.

The cross-sectional shape of the concave grooves 26 described in the first to third embodiments can be modified in various forms so that they are not limited.

1 is a cross-sectional view showing a conventional injector,

2 is a perspective view showing a conventional injection nozzle,

3 is a perspective view showing a spray nozzle according to a first embodiment of the present invention,

4 is a cross-sectional view showing a spray nozzle according to a first embodiment of the present invention;

5 is a cross-sectional view showing a spray nozzle according to a second embodiment of the present invention;

6 is a cross-sectional view showing a spray nozzle according to a third embodiment of the present invention.

DESCRIPTION OF THE REFERENCE NUMERALS

10: heat insulation pipe 11: support protrusion

12: transfer hole 20: heat conduction pipe

21: through hole 23: coupling portion

24 support portion 25 projecting portion

26: concave groove 40: injection nozzle

Claims (11)

In the injector injection nozzle 40 for supplying the liquid liquid fuel to the engine, An insulator tube (10) which maintains and transfers the liquid oil to the liquid phase so that heat is not transmitted according to the operation of the engine when the fuel oil is supplied to the engine through the injector; The through-hole 21 is formed in the longitudinal direction so that the heat insulating tube 10 is coupled therein, and a concave groove 26 is formed to communicate with the through-hole 21 on the outer surface to which the LLP fuel is injected, In the concave groove 26 to prevent the intake air of the engine to flow at the same time while preventing the water supply to the surroundings at the same time, the end surface of the heat insulating tube 10 is provided inside the through hole 21 The heat conduction pipe 20 which is not formed of a release material on the side to prevent freezing from occurring in the injection nozzle 40 and is formed of a heat conductive material and receives heat generated from the engine to suppress the occurrence of freezing. ); The composite injection nozzle for preventing frost, characterized in that comprises a. The method of claim 1, The inner circumferential edge of the through hole 21 is formed in multiple stages so that the stepped portion 22 is formed. 3. The method of claim 2, One end of the heat insulation pipe 10 is supported on one end of the step 22 so that the end surface of the heat insulation pipe 10 and the outer surface of the heat conduction pipe 20 are not formed in the same line, so that the heat conduction pipe 20 penetrates. The composite spray nozzle for preventing freezing, wherein freezing is suppressed on the outer surface of the hole 21 side. The method of claim 2 or 3, The height (H) of the step (22) is a composite injection nozzle for preventing freezing, characterized in that formed in 1 ~ 10mm to suppress the occurrence of freezing. 3. The method of claim 2, The end of the heat insulating tube 10 is a composite for preventing frost, characterized in that the support protrusion 11 is further formed to be supported by the through-hole 21 while the heat insulating tube 10 is in contact with one end surface of the step (22). Type spray nozzle. The method of claim 1, wherein the heat conduction pipe 20, A coupling part 23 formed of a screw thread to be coupled to one end of the injector 1; A support part 24 formed at an end of the coupling part 23 to protrude outward so that the heat conduction pipe 20 is supported by the injector 1; A protrusion 25 integrally formed on one end surface of the support part 24 and provided inside the engine or the fuel supply pipe to inject the liquid LP fuel; The composite injection nozzle for preventing frost, characterized in that comprising a. The method of claim 1, The depth (D) of the concave groove (26) is a composite injection nozzle for preventing freezing, characterized in that the intake air of the engine is second flow is formed to be more than 3mm to prevent the water supply around to prevent freezing. The method of claim 1, The concave groove 26 is a composite injection nozzle for preventing freezing, characterized in that formed in a hemispherical shape in cross section so that the secondary flow of the intake air sucked into the engine is smooth. The method of claim 1, The concave groove (26) is a composite injection nozzle for preventing freezing, characterized in that formed in the cross-sectional square shape so that the secondary flow of the intake air sucked into the engine smoothly. The method of claim 1, The concave groove 26 is a composite injection nozzle for preventing freezing, characterized in that formed in a polygonal cross-sectional shape to facilitate the secondary flow of the intake air sucked into the engine. The method of claim 1, When the concave groove 26 connects the end point E and the end point E 'in a straight line at the center point C, the angle θ between the end point E and the end point E' is 90 degrees or more. The composite spray nozzle for preventing frost, characterized in that formed to be.

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