DE102009032036A1 - Fuel filter for diesel engine, has housing which is covered by head cover, where housing is provided with filter assembly and hollow body which is arranged in filter assembly through head cover and is supported on head cover - Google Patents

Abstract

The fuel filter comprises housing (10) which is covered by a head cover (11). The housing is provided with a filter assembly (20) and a hollow body (30) which is arranged in the filter assembly through the head cover. The hollow body is supported on the head cover, where a heating arrangement (50) is arranged in the body. A thermal switch is arranged on an upper section of the body, and a water sensor unit (90) is arranged on the body. The body is formed as a module which comprises a heating arrangement, a thermal switch and a water sensor unit.

Description

For the registration will be the priority of the submitted on November 5, 2008 Korean Patent Application No. 10-2008-0109476 the entire contents of which are incorporated herein by reference.

The The invention relates to a fuel supply device, and in particular a fuel filter for a diesel engine.

in the Generally, a fuel filter is for a diesel engine at a fuel supply device for feeding of fuel from a fuel tank to the diesel engine intended.

A common one Fuel filter filters foreign matter from the diesel fuel, gives off heat to the fuel, to its solidification too prevent and separates moisture from the fuel and leaves this out.

9 FIG. 15 is a perspective view of a conventional fuel filter for a diesel engine. FIG.

Regarding 9 For example, a conventional fuel filter for a diesel engine has a filter cartridge 110 , a filter head 130 that is attached to the filter cartridge 110 is arranged, and a heater 150 on that between the filter cartridge 110 and the filter head 130 is arranged.

The heater 150 is used to prevent the solidification of the fuel in the winter season.

A thermal switch 160 is on one side of the filter head 130 for controlling the operation of the heater 150 arranged.

A water tank 170 to store moisture from the fuel is under the filter cartridge 110 arranged.

A water sensor 190 for detecting the water level of the water tank 170 and opening / closing the water tank 170 is on the water tank 170 arranged.

In the conventional fuel filter for a diesel engine, the filter head 130 , the heater 150 , the thermoswitch 160 and the water sensor 190 separately on the filter cartridge 110 configured so that the system is complicated and the overall size is increased.

Further the arrangement for the fuel filter is difficult at In an accident, the fuel filter with an increased Number of items can be easily damaged, and The assembly process for the fuel filter is complicated.

With The invention is a fuel filter for a diesel engine created in which a heating device, a thermal switch and a water sensor are integrally mounted as a module.

According to the The invention includes a fuel filter for a diesel engine a housing covered by a head cover and provided with a filter assembly, a hollow body, the inside of the filter assembly through the head cover arranged and supported on the head cover, a heating arrangement, which is located inside the body, a thermal switch, which is arranged on an upper portion of the body, and a water sensor unit disposed on the body is.

Of the Body may be formed as a module containing the heating arrangement, the thermal switch and the water sensor unit comprises.

The Heating arrangement and the thermal switch can be transferred a signal electrically connected to each other.

One Mounting section can be attached to the upper section of the body be arranged for mounting the thermal switch and the water sensor unit.

A Printed circuit board can be arranged on the mounting portion and with the Water sensor unit for transmitting a signal electrically be connected.

The Water sensor unit may be formed by at least one sensor pin become.

One Water tank may be attached to a lower portion of the filter assembly be arranged in the housing.

The one end of the sensor pin may be toward the water tank protrude.

Of the Body and the sensor bolt can go through together Injection molding be shaped.

One Water outlet can be attached to a lower section of the housing be arranged and connected to the water tank.

A Drain plug may be located at the water outlet.

A plurality of PTC thermistors may be disposed between a pair of PTC plates be.

The Heating arrangement may further comprise a PTC housing, which the PTC plates and the PTC thermistors fixed, and have a stop, which holds the PTC plates to the PTC thermistors.

One Fuel inlet and a fuel outlet can be arranged on the head cover.

A first passage can be formed on the body and with the Fuel inlet be connected, and a second passage can be trained in the body and with the first passage be connected.

One Water tank may be attached to a lower portion of the filter assembly disposed in the housing and connected to the second passage be.

A third passage can be between the filter assembly and the housing be educated.

The third passage can with the water tank and the fuel outlet be connected.

Of the Fuel filter according to the exemplary embodiment The invention relates to a heating arrangement, a thermal switch and a water sensor unit as a module, so that the whole system is simplified and the overall size is compact can be.

Therefore can the number of parts of the fuel filter according to the minimized exemplary embodiment of the invention The possibility of inaccurate assembly can be prevented be reduced, the manufacturing cost and weight can be reduced be, the arrangement can be done easily, and safety in an accident can be expected.

The The invention will be explained in more detail with reference to the drawing. In the drawing show:

1 a perspective view of a fuel filter for a diesel engine according to an exemplary embodiment of the invention;

2 an exploded perspective view of the fuel filter 1 ;

3 a schematic plan view of the fuel filter 1 ;

4 a section along the line AA in 3 ;

5 a block diagram of 4 ;

6 an exploded perspective view of the body 2 ;

7 a perspective view of the body 6 ;

8th 1 is a block diagram illustrating the operation of the fuel filter according to an exemplary embodiment of the invention; and

9 a perspective view of a conventional fuel filter for a diesel engine.

With reference to the 1 to 3 filters a fuel filter 100 for a diesel engine according to an exemplary embodiment of the invention, diesel fuel (hereinafter simply referred to as "fuel") conveyed from a fuel tank to a diesel engine.

The fuel filter 100 It filters foreign particles out of the fuel, releases heat to the fuel to prevent it from solidifying, and releases moisture from the fuel.

The fuel filter 100 has a housing 10 and a hollow body 30 on.

The housing 10 with a wide interior has at its upper portion an open part and at its lower portion a closed part. The upper section of the housing 10 is from a head cover 11 covered.

In the head cover 11 are a fuel inlet 13 for introducing the fuel into it and a fuel outlet 15 for discharging the fuel disposed therefrom.

In the head cover 11 is a mounting hole 17 for mounting the hollow body 30 educated.

A filter arrangement 20 is inside the case 10 arranged to filter the fuel.

Regarding 4 is a water tank 19 at a lower portion of the housing 10 educated.

The water tank 19 is under the filter arrangement 20 arranged and collects and stores water through the filter assembly 20 is separated from the fuel.

A water outlet 16 is at a lower level Section of the housing 10 trained and with the water tank 19 connected and leaves that in the water tank 19 stored water.

A drain plug 18 for selectively opening the water outlet 16 is at the water outlet 16 configured.

In the exemplary embodiment, the hollow body is 30 through the mounting hole 17 of the head cover 11 through into the housing 10 used and shaped as a plastic cylinder.

The hollow body 30 for simplification as "body 30 Is designated within the filter assembly 20 of the housing 10 arranged.

A mounting section 31 to configure items is at the top of the body 30 trained and on the head cover 11 supported.

Regarding 5 is the body 30 with a first passage 33 ( 2 ) provided with the fuel inlet 13 connected is.

The first passage 33 is near the mounting section 31 educated.

A second passage 35 that with the first passage 33 is connected in the body 30 trained and with the water tank 19 of the housing 10 connected.

A third passage 37 is in the case 10 trained and with the fuel outlet 15 connected.

The third passage 37 is between the filter assembly 20 and the housing 10 trained, with the water tank 19 of the housing 10 connected, and communicates through the filter assembly 20 through with the fuel outlet 15 ,

With reference to the 6 and 7 is the body 30 as a module integral with a heating arrangement 50 , a thermal switch 70 and a water sensor unit 90 educated.

In the exemplary embodiment, the heater assembly is 50 Heat to the fuel from the fuel inlet 13 and the first passage 33 to the second passage 35 to be led.

The heating arrangement 50 is inside the body 30 and preferably in the second passage 35 of the body 30 arranged.

The heating arrangement 50 has a pair of PTC plates 51 and a plurality of PTC thermistors 53 on that between the PTC plates 51 are arranged.

The PTC plates 51 are spaced apart, with the mounting portion 31 of the body 30 connected, and with a pair of Heizanschlussstücken 61 at the mounting section 31 are configured, electrically connected.

The PTC plates 51 lead the PTC thermistors 53 electric current and fix the PTC thermistors 53 ,

The mounting section 31 is integral with a power connector 63 formed by a connecting plate 65 with the one Heizanschlussstück 61 electrically connected.

The PTC thermistors 53 as heating elements are between the PTC plates 51 fixed and screwed or riveted (not shown) to the PTC plates 51 attached.

The PTC thermistors 53 are made of semiconductor thermistors, convert electrical energy into heat by the process of Joule heating, and become when the PTC thermistors 53 reach a certain temperature and the resistance is increased by keeping current off at a constant temperature.

The heating arrangement 50 also has a PTC housing 55 and a stop 57 on.

The PTC housing 55 supports the PTC plates 51 for fixing the PTC plates 51 and the PTC thermistors 53 and is under the PTC plates 51 arranged.

The stop 57 Holds the PTC plates 51 at the PTC thermistors 53 firmly and is between the PTC plates 51 and screws or rivets (not shown).

In the exemplary embodiment, the thermal switch detects 70 that of the heater assembly 50 caused temperature changes of the second passage 35 and controls the operation of the heating arrangement 50 according to the changes of the temperature.

That is, the thermal switch 70 is with the heating arrangement 50 electrically connected.

The thermal switch 70 is on the mounting section 31 of the body 30 arranged and with the other Heizanschlussstück 61 the heating arrangement 50 connected.

The thermal switch 70 is a commercially available thermal switch, so that its detailed description is omitted.

In the exemplary embodiment, the water sensor unit senses 90 the water level of the water tank 19 of the housing 10 ,

The water sensor unit 90 has at least one sensor pin 91 on, the one-piece with the body 30 and preferably formed as a pair.

Every sensor bolt 91 is made of metal and integral with the body 30 made of plastic by injection molding.

An upper section of the sensor pin 91 stands from the mounting section 31 before, and a lower portion of the sensor pin 91 juts into the water tank 19 into it.

The water sensor unit 90 is with a circuit board 95 connected as an electrical signal.

The circuit board 95 is on the mounting section 31 of the body 30 arranged and with various types of ICs and thermistors for detecting and processing the signal from the water sensor unit 90 Mistake.

The fuel filter 100 is with the heating arrangement 50 , the thermal switch 70 and the water sensor unit 90 provided as a module, so that the overall size of the fuel filter 100 can be reduced.

Therefore may in the exemplary embodiment of the invention the total number of items can be reduced, which can failure can be prevented, the manufacturing cost and weight can can be reduced, the determination of the arrangement can be easily realized and assembly can be improved.

With reference to the 1 to 8th below is the operation of the fuel filter 100 according to the exemplary embodiment of the invention.

The diesel fuel in a fuel tank (not shown) is via the fuel inlet port 13 to the housing 10 promoted.

The fuel flows over the first passage 33 in the case 10 in the second passage 35 into it.

In this process, the heating arrangement 50 by controlling the thermal switch 70 operated and takes electrical power from the power connector 63 on, leaving the PTC thermistors 53 Give off heat.

The fuel takes the heat from the heater assembly 50 in the second passage 35 and maintains a constant temperature.

The fuel flows from the second passage 35 in the water tank 19 in and step over the third passage 37 through the filter assembly 20 therethrough.

In this process, foreign matter contained in the fuel passes through the filter assembly 20 filtered.

Then the filtered fuel through the fuel outlet 15 passed through and fed via a fuel supply device (not shown) to a diesel engine (not shown).

In this process can be done by heating the heater assembly 50 solidification of the fuel can be prevented.

The water contained in the fuel may be due to differences in density in the water tank 19 are stored, and the water sensor unit 90 detects the water level of the water tank 19 ,

That in the water tank 19 Stored water can through the water outlet 16 of the housing 10 be left out when the drain plug 18 is solved.

In the exemplary embodiment, the water may be eliminated by differences in density from the fuel as the fuel travels along the second passage 35 flows, so that the water can be eliminated efficiently.

QUOTES INCLUDE IN THE DESCRIPTION

This list The documents listed by the applicant have been automated generated and is solely for better information recorded by the reader. The list is not part of the German Patent or utility model application. The DPMA takes over no liability for any errors or omissions.

Cited patent literature

• - KR 10-2008-0109476 [0001]

Claims (17)

Fuel filter for a diesel engine, comprising: a housing ( 10 ) by a head cover ( 11 ) and with a filter arrangement ( 20 ) is provided; a hollow body ( 30 ) located within the filter assembly ( 20 ) through the head cover ( 11 ) and on the head cover ( 11 ) is supported; a heating arrangement ( 50 ), which are inside the body ( 30 ) is arranged; a thermal switch ( 70 ) attached to an upper portion of the body ( 30 ) is arranged; and a water sensor unit ( 90 ) attached to the body ( 30 ) is arranged. A fuel filter according to claim 1, wherein the body ( 30 ) is formed as a module, the heating arrangement ( 50 ), the thermal switch ( 70 ) and the water sensor unit ( 90 ). Fuel filter according to claim 1, wherein the heating arrangement ( 50 ) and the thermal switch ( 70 ) are electrically connected together to transmit a signal. A fuel filter according to claim 1, further comprising a mounting portion (Fig. 31 ), which at the upper portion of the body ( 30 ) for mounting the thermal switch ( 70 ) and the water sensor unit ( 90 ) is arranged. Fuel filter according to claim 4, further comprising a printed circuit board ( 95 ) located at the mounting section ( 31 ) and with the water sensor unit ( 90 ) is electrically connected to transmit a signal. Fuel filter according to claim 1, wherein the water sensor unit ( 90 ) of at least one sensor pin ( 91 ) is formed. A fuel filter according to claim 6, further comprising a water tank ( 19 ) located at a lower portion of the filter assembly ( 20 ) in the housing ( 10 ) is arranged. Fuel filter according to claim 7, wherein the one end of the sensor pin ( 91 ) towards the water tank ( 19 ) protrudes. A fuel filter according to claim 6, wherein the body ( 30 ) and the sensor bolts ( 91 ) are molded together by injection molding. A fuel filter according to claim 7, further comprising a water outlet ( 16 ) located at a lower portion of the housing ( 10 ) and with the water tank ( 19 ) connected is. A fuel filter according to claim 10, further comprising a drain plug (10). 18 ) located at the water outlet ( 16 ) is arranged. Fuel filter according to claim 1, wherein the heating arrangement ( 50 ) a pair of PTC plates ( 51 ) and a plurality of PTC thermistors ( 53 ) between the PTC plates ( 51 ) are arranged. Fuel filter according to claim 12, wherein the heating arrangement ( 50 ) further comprises: a PTC housing ( 55 ), the PTC plates ( 51 ) and the PTC thermistors ( 53 ) fixed; and a stop ( 57 ), the PTC plates ( 51 ) on the PTC thermistors ( 53 ) holds. A fuel filter according to claim 1, further comprising a fuel inlet port ( 13 ) and a fuel outlet ( 15 ) attached to the head cover ( 11 ) are arranged. The fuel filter of claim 14, further comprising: a first passage ( 33 ) attached to the body ( 30 ) and with the fuel inlet ( 13 ) connected is; and a second passage ( 35 ) in the body ( 30 ) and with the first passage ( 33 ) connected is. A fuel filter according to claim 15, further comprising a water tank ( 19 ) located at a lower portion of the filter assembly ( 20 ) in the housing ( 10 ) and with the second passage ( 35 ) connected is. A fuel filter according to claim 16, further comprising a third passage ( 37 ) between the filter assembly ( 20 ) and the housing ( 10 ) and with the water tank ( 19 ) and the fuel outlet ( 15 ) connected is.