KR20140061024A - Structure of fuel-heater for diesel vehicle - Google Patents

Structure of fuel-heater for diesel vehicle Download PDF

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Publication number
KR20140061024A
KR20140061024A KR1020120128115A KR20120128115A KR20140061024A KR 20140061024 A KR20140061024 A KR 20140061024A KR 1020120128115 A KR1020120128115 A KR 1020120128115A KR 20120128115 A KR20120128115 A KR 20120128115A KR 20140061024 A KR20140061024 A KR 20140061024A
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KR
South Korea
Prior art keywords
fuel
wall surface
surface part
ptc device
heater
Prior art date
Application number
KR1020120128115A
Other languages
Korean (ko)
Inventor
구슬기
류부열
김명환
박창준
Original Assignee
현대자동차주식회사
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Publication date
Application filed by 현대자동차주식회사 filed Critical 현대자동차주식회사
Priority to KR1020120128115A priority Critical patent/KR20140061024A/en
Publication of KR20140061024A publication Critical patent/KR20140061024A/en

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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M31/00—Apparatus for thermally treating combustion-air, fuel, or fuel-air mixture
    • F02M31/02—Apparatus for thermally treating combustion-air, fuel, or fuel-air mixture for heating
    • F02M31/12—Apparatus for thermally treating combustion-air, fuel, or fuel-air mixture for heating electrically
    • F02M31/125—Fuel
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M37/00—Apparatus or systems for feeding liquid fuel from storage containers to carburettors or fuel-injection apparatus; Arrangements for purifying liquid fuel specially adapted for, or arranged on, internal-combustion engines
    • F02M37/22—Arrangements for purifying liquid fuel specially adapted for, or arranged on, internal-combustion engines, e.g. arrangements in the feeding system
    • F02M37/30—Arrangements for purifying liquid fuel specially adapted for, or arranged on, internal-combustion engines, e.g. arrangements in the feeding system characterised by heating means

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Air-Conditioning For Vehicles (AREA)

Abstract

The present invention relates to a structure of a fuel-heater for a diesel vehicle mounted on the top of a fuel-heater so as to heat fuel, which has flowed in from upside, with a PTC device and discharge the fuel to a fuel filter at a lower side. The structure of a fuel-heater for a diesel vehicle according to the present invention comprises: a PTC device mounted between plates arranged at upper and lower sides and generating heat by the application of power; an upper housing combined with the upper side of the PTC device, and having an outer wall surface part and an inner wall surface part protruding downward, wherein the inner wall surface part is separated inward from the outer wall surface part; and a lower housing combined with the upper housing at the lower side of the PTC device, and having a middle wall surface part protruding upward to be advanced between the outer wall surface part and the inner wall surface part. The upper housing has an inflow hole for introducing the fuel. An opened flow path is formed between the inner wall surface part and the middle wall surface part and between the outer wall surface part and the middle wall surface part so as to make the fuel flow. The present invention can be formed in the shape of a ring because an upper plate, a lower plate and a planar plate, which are arranged below and above the PTC device, can be mounted on the lower housing. Therefore, the present invention can dissipate heat generated by the PTC device efficiently. The present invention can reduce the flowing pressure loss of the fuel and can increase heat exchanging efficiency by forming a flow path for passing the fuel in a vertically trembling shape.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fuel heater for a diesel vehicle,

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a structure of a fuel heater for a diesel vehicle, and more particularly, to a structure of a fuel heater for a diesel vehicle, which is coupled to an upper end of a fuel filter, The present invention relates to a structure of a fuel heater for a diesel vehicle flowing in a swinging manner.

Since the pollutants mixed with the fuel can damage the engine, as well as the valves, the pumps and the nozzles, the fuel discharged from the fuel tank is filtered and transported through the fuel filter before being transferred to the engine.

The fuel filter includes a filter material for filtering foreign matter and moisture introduced into the fuel. Particularly, in the case of a vehicle which uses diesel fuel which is sensitive to moisture and whose viscosity increases when the temperature falls to a low temperature, it is general that the fuel filter and the fuel heater are modularized as one assembly and mounted on the vehicle.

The structure of a conventional fuel heater combined with a fuel filter is as shown in Fig.

Referring to the drawings, a fuel heater is mounted on an upper end of a fuel filter to which a moisture sensor is attached. Thus, the fuel discharged from the fuel tank is configured to pass through the fuel heater and the fuel filter before being conveyed to the fuel pump that injects the fuel at a high pressure. The fuel introduced above the fuel heater (through the inlet hole punctured in the housing) passes through the fuel heater (as indicated by the arrows in the figure) and is transferred to the fuel filter located below the fuel heater, Is filtered in the fuel filter together with the separation process, and then discharged to the fuel pump through the discharge pipe.

The fuel heater includes a PTC (Positive Temperature Coefficient) element that is mounted in the housing and emits heat according to current application. The PTC device is a heating element that increases internal resistance when a current is applied and emits heat. When the temperature reaches a predetermined temperature, the PTC device changes into a nonconductor and can constantly maintain a constant temperature. An upper plate and a lower plate are mounted on the upper and lower sides of the PTC element, respectively. The plates function to discharge heat generated in the PTC device, and the plate spring functions to elastically press the plates to the PTC device so that heat generated from the PTC device can be dispersed to the utmost. The bimetallic assembly has a structure in which two metal bodies having different thermal expansion coefficients are coupled to each other. The bimetallic assembly is formed by using the difference in thermal expansion coefficient of the metal bodies generated according to the temperature of the fuel. And the anode of the power supply is configured to control the short-circuit of the terminals connected to each other.

Meanwhile, in the conventional structure, a plurality of PTC elements are spaced apart from each other between the plates. However, since the plates do not have a ring shape (one side is connected to the terminal and the bimetal assembly and have a structure in which they are fitted and fixed in the housing), the PTC devices can not be arranged in a circular array (see FIG. 5) There is a problem that heat is distributed. In the portion where the heat conduction is not properly performed, paraffin components present in the fuel (light oil) are generated as solids (obstructing the flow of the fuel), resulting in a loss of flow pressure of the fuel.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a structure of a fuel heater for a diesel vehicle capable of improving the heating efficiency of the fuel and preventing the flow pressure loss of the fuel.

According to an aspect of the present invention, there is provided a structure of a fuel heater for a diesel vehicle, which is mounted on an upper end of a fuel filter such that fuel introduced from the upper side is heated by a PTC element and discharged to a lower fuel filter, A PTC device mounted between the plates disposed on the upper surface of the PTC device and configured to generate heat in response to application of power, and an upper wall surface portion and an inner wall surface portion protruding downwardly from the upper side of the PTC device, An upper housing; And a lower housing coupled to the upper housing at a lower side of the PTC device and having an intermediate wall surface portion projecting upward to enter between the outer wall surface portion and the inner wall surface portion, And a flow path is formed between the inner wall surface portion and the intermediate wall surface portion and between the outer wall surface portion and the intermediate wall surface portion so as to allow the fuel to flow.

And the upper end of the intermediate wall portion is mounted to be spaced apart from the lower surface of the upper housing. The lower housing has a circular plate shape, and the flow passage is formed to have a circular shape along the circumference of the lower housing.

In addition, it further includes a ring-shaped leaf spring that resiliently urges the plates to the PTC device.

In the present invention having the above-described structure, the upper plate, the lower plate, and the plate plate disposed above and below the PTC device can be mounted on the lower housing (unlike the conventional structure) and thus can be formed in a ring shape. Therefore, the heat generated in the PTC device can be more efficiently dispersed.

In the structure of the present invention, the passage through which the fuel passes is formed in a shape that swings up and down, thereby reducing the flow pressure loss of the fuel and improving the heat exchange rate. In addition, as a structure in which the PTC element is immersed in the fuel, a short phenomenon (which may occur in the conventional structure) can be prevented originally.

1 is a view showing an image showing a state in which a fuel heater and a fuel filter are combined and an image showing a state in which a conventional fuel heater is disassembled;
FIG. 2 is a perspective view showing a partial cut-away view of a fuel heater according to a preferred embodiment of the present invention,
3 is a perspective view showing a state in which the PTC element, the plates and the leaf spring are removed in the drawing of FIG. 2,
FIG. 4 is a perspective view of a fuel heater according to a preferred embodiment of the present invention,
5 is an exploded perspective view of a fuel heater of a conventional structure and a fuel heater having a structure according to the present invention, respectively.

The fuel heater according to the present invention is configured so as to be modularly mounted with a fuel filter (as shown in Fig. 1), and the fuel introduced from the upper side is discharged from the fuel heater to the fuel filter located below.

The fuel heater and the fuel filter are mounted in a path through which the fuel discharged from the fuel tank passes before reaching the fuel pump, and the built-in PTC device is configured so that current can be externally applied to generate heat. In the fuel heater of the present invention, like the conventional structure, mounting holes 13 and 22 are formed in the upper housing and the lower housing, respectively, so as to fit the discharge pipe (as shown in FIG. 1).

Hereinafter, the structure of a fuel heater for a diesel vehicle according to a preferred embodiment of the present invention will be described in more detail with reference to the drawings.

Referring to FIGS. 2 to 4, the fuel heater of the present invention includes a PTC device 40 that generates heat by increasing the resistance according to power application. A plurality of the PTC devices 40 are mounted, and are fixed between two plates 30 and 50 having a ring shape and formed with a plurality of holes and grooves so that fuel can flow.

The upper plate 30 disposed on the PTC devices 40 and the lower plate 50 disposed below are connected to the terminal 70 (together with the bimetal assembly), and one of the '+' and '-' Respectively.

The upper plate 30 and the lower plate 50 are mounted between the upper housing 10 and the lower housing 20 while being coupled to the PTC device 40. The plates 30 and 50 are connected to the PTC device Shaped leaf spring 60 is additionally engaged so as to be elastically pressed against the base plate 40. The plate spring 60 is disposed to be supported by the upper surface of the lower housing 10 (or the lower surface of the upper housing) to closely contact the plates 30 and 50 to the PTC device 40.

The PTC device 40 and the plates 30 and 50 and the leaf spring 60 are located inside the upper housing 10 and the lower housing 20 so that the upper housing 10 can receive fuel from the upper side A plurality of inlet holes are formed. The upper housing 10 is formed such that the outer wall surface portion 11 and the inner wall surface portion 12 protrude downward. The outer wall surface portion 11 is formed in the vicinity of the rim along the periphery of the upper housing 10 and the inner wall surface portion 12 is formed inwardly of the outer wall surface portion 12.

The lower housing 20 is coupled to the upper housing 10 at a lower side of the PTC device 40 so that the intermediate wall 21 protrudes upward to enter between the outer wall 11 and the inner wall 12 .

Therefore, the upper housing 10 is provided with the inflow holes through which the fuel flows. Therefore, as shown by the arrows in FIG. 3, the distance between the inner wall surface portion 12 and the intermediate wall surface portion 21 and between the outer wall surface portion 11 and the intermediate wall surface A flow path is formed between the first and second flow paths 21 and 21 so that the fuel flows.

As shown in the drawing, the upper end of the intermediate wall portion 21 according to the preferred embodiment of the present invention is mounted so as to be spaced apart from the lower surface of the upper housing 10, Holes or grooves may be additionally formed in the intermediate wall portion 21 to improve the flow of the fuel.

As shown in FIG. 5, the fuel heater of the present invention having the above-described structure can be mounted on the upper side (since it can be fixed by the lower housing and is free from the fixing structure and more freely in the configuration) Since the plate 30 and the lower plate 50 are formed in a ring shape, the PTC elements 40 can be uniformly dispersed without being shifted to any one place, and heat dissipation can be performed more efficiently.

In the conventional structure, although the fuel immediately passes through the holes (through the holes formed in the plates) from the upper side to the lower side (see the arrows shown in FIG. 1), in the structure of the present invention Since the flow path is formed in a swinging manner, the PTC devices 40 are directly immersed in the fuel in the upper housing 10 and the lower housing 20, and the time for heat exchange with the fuel is increased So that the fuel can be heated more quickly and efficiently, and overheating of the PTC elements 40 can be prevented.

As described above, the embodiments disclosed in the present specification and drawings are only illustrative of specific examples in order to facilitate understanding of the present invention, and are not intended to limit the scope of the present invention. It will be apparent to those skilled in the art that other modifications based on the technical idea of the present invention are possible in addition to the embodiments disclosed herein.

10: upper housing
11: outer wall surface
12: inner wall portion
20: Lower housing
21: intermediate wall portion
30: upper plate
40: PTC element
50: Lower plate
60: leaf spring

Claims (4)

A fuel heater for a diesel vehicle in which fuel introduced from an upper side is mounted on an upper end of a fuel filter so as to be heated by a PTC element and discharged to a lower fuel filter,
A PTC element mounted between the upper and lower plates and generating heat in accordance with power application; and an upper wall portion and an inner wall portion protruding downwardly from the upper side of the PTC device, An upper housing formed to be spaced inward; And a lower housing coupled to the upper housing at a lower side of the PTC device, the lower housing protruding upwardly to enter between the outer wall surface portion and the inner wall surface portion,
Wherein the upper housing is formed with an inflow hole through which fuel flows, and a flow path is formed between the inner wall surface portion and the intermediate wall surface portion and between the outer wall surface portion and the intermediate wall surface portion so as to allow fuel to flow therethrough. rescue.
The structure of a fuel heater for a diesel vehicle according to claim 1, wherein an upper end of the intermediate wall portion is spaced apart from a lower surface of the upper housing.
3. The fuel heater according to claim 2, wherein the lower housing is in the shape of a disk, and the flow path is formed to have a circular shape along the periphery of the lower housing.
The structure of a fuel heater for a diesel vehicle according to claim 2 or 3, further comprising a ring-shaped leaf spring elastically pressing the plates to the PTC element.
KR1020120128115A 2012-11-13 2012-11-13 Structure of fuel-heater for diesel vehicle KR20140061024A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
KR1020120128115A KR20140061024A (en) 2012-11-13 2012-11-13 Structure of fuel-heater for diesel vehicle

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
KR1020120128115A KR20140061024A (en) 2012-11-13 2012-11-13 Structure of fuel-heater for diesel vehicle

Publications (1)

Publication Number Publication Date
KR20140061024A true KR20140061024A (en) 2014-05-21

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20170167455A1 (en) * 2015-12-14 2017-06-15 Hyundai Motor Company Next-generation diesel fuel filter integrated with fuel pump
KR20200040556A (en) * 2018-10-10 2020-04-20 한국자동차연구원 Heater module for fuel filter capable of multi stage temperature control and management apparatus thereof
KR102309685B1 (en) * 2020-05-15 2021-10-07 주식회사 에스엠에스 A fuel filter heater using diesel vihicle

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20170167455A1 (en) * 2015-12-14 2017-06-15 Hyundai Motor Company Next-generation diesel fuel filter integrated with fuel pump
CN106870229A (en) * 2015-12-14 2017-06-20 现代自动车株式会社 Novel diesel filter integrally formed with petrolift
DE102016114279B4 (en) 2015-12-14 2024-07-04 Hyundai Motor Company Next generation diesel fuel filter integrated with fuel pump
KR20200040556A (en) * 2018-10-10 2020-04-20 한국자동차연구원 Heater module for fuel filter capable of multi stage temperature control and management apparatus thereof
KR102309685B1 (en) * 2020-05-15 2021-10-07 주식회사 에스엠에스 A fuel filter heater using diesel vihicle

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