CN101956637A - Fuel supply equipment for internal combustion engines - Google Patents

Abstract

The invention relates to a fuel supply system for an internal combustion engine, namely a common rail fuel supply system, with a low-pressure region, with a pump arrangement comprising at least one high-pressure pump (1) for conveying fuel from the low-pressure region into the high-pressure region, wherein, in the high-pressure region, between the pump device and the injector associated with the cylinder is arranged a pressure storage system with at least one storage unit, which is permanently under high pressure, and wherein each high-pressure pump (1) of the pump device Respectively with a suction valve (3) (through which the fuel can be sucked from the low pressure area into the pump chamber (2) of each high pressure pump) and a delivery valve (4) (through which the delivery valve (4) fuel can be delivered from the pump chamber (2) of each high-pressure pump in the direction towards the pressure storage system) associated. According to the invention, the valve seat (8) of the suction valve (3) and/or the valve seat (10) of the delivery valve (4) of each high-pressure pump (1) is respectively replaced by a replaceable seat insert (11, 12 )form.

Description

Fuel supply equipment for internal combustion engines

technical field

The invention relates to a fuel supply arrangement for an internal combustion engine, ie a common rail fuel supply arrangement, according to the preamble of claim 1 .

Background technique

Document DE 10 2004 060 003 A1 discloses a multi-cylinder internal combustion engine, ie a marine diesel internal combustion engine operating on heavy oil, wherein each cylinder is associated with an injector of a common rail fuel supply. Fuel can be injected into each of the cylinders of the internal combustion engine by injectors. The common-rail fuel supply system according to document DE 10 2004 060 003 A1 comprises a pump arrangement with a plurality of high-pressure pumps for conveying fuel from the low-pressure area of the common-rail fuel supply system into the high-pressure area, wherein in the high-pressure area A pressure accumulator system (Druckspeicher system) which is constantly under high pressure is arranged between the pump device and the injector. According to DE 10 2004 060 003 A1, the pressure storage system (also referred to as a common rail system) which is constantly under high pressure has a plurality of storage units and is connected to the pump device via a high-pressure fuel line which is also constantly under high pressure. Furthermore, the pressure accumulator system is connected to the injector via a high-pressure fuel line which is intermittently under high pressure depending on the injection cycle. In a common rail fuel supply system according to DE 10 2004 060 003 A1, each high-pressure pump is associated with a suction valve and a delivery valve, whereby fuel can be sucked from the low-pressure area to the In the pump chambers of the respective high-pressure pumps, and wherein fuel can be conveyed from the pump chambers of the respective high-pressure pumps in the direction of the pressure storage system via the delivery valve.

形成。阀座在运行过程中承受磨损，以使得当阀座磨损时，必须更换各高压泵的阀承载件和/或泵缸。这为高消耗且高成本的。The suction valve and delivery valve of each high-pressure pump respectively have a valve body cooperating with the valve seat, wherein, the valve seat of the suction valve of each high-pressure pump and the delivery valve can be controlled by the pump cylinder of each high-pressure pump or by each high-pressure pump The valve carrier that cooperates with the pump cylinder

form. The valve seats are subject to wear during operation, so that when the valve seats are worn, the valve carrier and/or the pump cylinder of the respective high-pressure pump must be replaced. This is expensive and costly.

Contents of the invention

Based on this, the problem underlying the present invention is to realize a new type of fuel supply system for an internal combustion engine, namely an improved common rail fuel supply system.

This problem is solved by a fuel supply device according to claim 1 . According to the invention, the valve seat of the suction valve and/or the valve seat of the delivery valve of each high-pressure pump is formed by a replaceable seat insert.

In the fuel supply device according to the invention, the valve seats of the suction valve and/or delivery valve of the high-pressure pump are provided by replaceable seat inserts constructed as separate parts. Then, when the seat insert wears out, the seat insert can be replaced with less expenditure. There is no need to replace the pump cylinder or the valve carrier of the high pressure pump. As a result, the lifetime of the components can be increased. As a result, overall costs can be reduced.

Description of drawings

Preferred refinements of the invention emerge from the subclaims and the description below. Embodiments of the present invention are further explained with reference to the drawings, but are not limited to these embodiments. in:

FIG. 1 shows a schematic sectional view of the high-pressure region of a common rail fuel supply system for an internal combustion engine according to the invention in the region of a high-pressure pump.

List of reference numerals

1 high pressure pump

2 pump chambers

3 suction valve

4 transfer valve

5 cylinders

6 Valve carrier

7 valve body

8 seat

9 valve body

10 seat

11 seat inserts

12 seat inserts

13 grooves

14 grooves

Detailed ways

The invention relates to a common rail fuel supply system for internal combustion engines, in particular marine diesel internal combustion engines operating on heavy fuel oil. Common rail fuel supply equipment has a low pressure area and a high pressure area. The high-pressure area of the common rail fuel supply system comprises a pump device with at least one high-pressure pump and a pressure storage system with at least one storage unit, wherein the pump device conveys fuel from the low-pressure area into the high-pressure area and through at least one high-pressure fuel line The circuit is connected to the pressure storage system. The pressure accumulator system and the or each high-pressure fuel line connecting the pressure accumulator system to the pump device are constantly under high operating pressure. From the pressure accumulator system, fuel can be injected into the cylinders via injectors, wherein each injector is connected to the pressure accumulator system via at least one high-pressure fuel line which is intermittently under high pressure depending on the injection cycle of the internal combustion engine.

1 shows a cross-sectional view of a high-pressure pump 1 of a common rail fuel supply in the region of the pump chamber 2 of the high-pressure pump 1 , wherein fuel can be conveyed via a suction valve 3 from the low-pressure region of the fuel supply to the high-pressure pump 1 In the pump chamber 2 of the high-pressure pump 1 , fuel can be conveyed from the pump chamber 2 in the direction of the pressure storage system of the fuel supply device through the delivery valve 4 of the high-pressure pump 1 . A suction valve 3 of this type and a delivery valve 4 of this type are associated with each high-pressure pump 1 of the common rail fuel supply system.

The pump chamber 2 of the high-pressure pump shown in FIG. 1 is integrated in a so-called pump cylinder 5 of the high-pressure pump. The pump cylinder 5 is associated with a so-called valve carrier 6 by means of an interface to a fuel line or to a component with a fuel supply hole, or else a fuel line is introduced in the valve carrier 6 , That is to say on the one hand such a fuel line for supplying fuel from the low-pressure area to the pump valve 3 and on the other hand such a fuel line for supplying fuel from the delivery valve 4 to the pressure storage system of the fuel supply device .

Each of the valves associated with the high-pressure pump 1 (ie both the suction valve 3 and the delivery valve 4 ) each has a movable valve body which cooperates with a fixed valve seat. The suction valve 3 thus has a valve body 7 which cooperates with a valve seat 8 . Delivery valve 4 has a valve body 9 which cooperates with a valve seat 10 .

In the concept of the invention, the valve seat 8 of the suction valve 3 and/or the valve seat 10 of the delivery valve 4 of the shown high-pressure pump 1 is formed by a separate, exchangeable seat insert 11 or 12 . Thus, according to FIG. 1 , the valve seat 8 of the suction valve 3 is formed by a seat insert 11 and the valve seat 10 of the delivery valve 4 is formed by a seat insert 12 .

In the embodiment shown in FIG. 1 , the seat insert 11 of the suction valve 3 , which provides the valve seat 8 for the valve body 7 of the suction valve 3 , is inserted into a groove 13 formed in the valve carrier 6 middle. Instead, the seat insert 12 of the delivery valve 4 , which provides the valve seat 10 for the valve body 9 of the delivery valve 4 , is inserted into a recess 14 introduced into the pump cylinder 5 of the high-pressure pump 1 .

It is pointed out at this point that, unlike the illustrated embodiment, it is also possible to place both seat inserts 11 and 12 of the suction valve 3 and the delivery valve 4 respectively in such recesses that this Both are introduced either into the pump cylinder 5 or into the valve carrier 6 . It is also possible to position the seat insert 11 of the suction valve 3 into a recess in the pump cylinder 5 and the seat insert 12 of the delivery valve 4 into a recess in the valve carrier 6 .

The seat inserts 11 and 12 are preferably formed from a hard, highly load-resistant material. Preferably, the seat inserts 11 and 12 are machined from ceramic material.

The invention has the advantage that the valve seats 8 and 9 of the suction valve 3 and delivery valve 4 which are subject to high wear are formed from separate seat inserts 11 , 12 which can be replaced easily in the event of wear. Thus, worn valve seats can be easily replaced, whereby the lifetime of other components of the high-pressure pump can be increased. Hence, cost savings overall.

Claims (7)

1. the fuel facility of an internal-combustion engine, it is the common rail fuel supply equipment, have the area of low pressure, have the pump-unit that comprises at least one high-pressure service pump, to be used for that fuel is transported to the high-pressure area from described area of low pressure, wherein, in described high-pressure area described pump-unit and with sparger that cylinder is associated between be provided with and have at least one storage unit, continue to be in the pressure storage system under the high pressure, and wherein, each high-pressure service pump of described pump-unit is associated with a suction valve and a delivery valve respectively, fuel can be drawn into the pump chamber of each high-pressure service pump from described area of low pressure by described suction valve, can be by described delivery valve at transfer the fuel on the direction of described pressure storage system from the pump chamber of each high-pressure service pump, it is characterized in that, the valve seat (8) of the suction valve (3) of each high-pressure service pump (1) and/or the valve seat (10) of delivery valve (4) are formed by removable seat inserting member (11,12) respectively.

2. fuel facility according to claim 1 is characterized in that, the valve seat (8) of the suction valve (3) of each high-pressure service pump (1) and the valve seat (10) of delivery valve (4) respectively by independently, removable seat inserting member (11,12) forms.

3. fuel facility according to claim 1 and 2, it is characterized in that, be used for providing the seat inserting member (12) of the valve seat (8) of described delivery valve (4) to be combined in the groove (14) of the pumping cylinder (5) of each high-pressure service pump, and be used for providing the seat inserting member (11) of the valve seat (8) of described suction valve (3) to be combined in groove (13) with the valve load-bearing member (6) of coefficient each high-pressure service pump of described pumping cylinder (5).

4. fuel facility according to claim 1 and 2, it is characterized in that, be used for providing described suction valve (3) valve seat (8) seat inserting member (11) and be used to provide the inserting member (12) of the valve seat (10) of described delivery valve (4) to be combined in the groove of the pumping cylinder (5) of each high-pressure service pump respectively.

5. fuel facility according to claim 1 and 2, it is characterized in that, be used for providing described suction valve (3) valve seat (8) seat inserting member (11) and be used to provide the inserting member (12) of the valve seat (10) of described delivery valve (4) be combined in respectively with coefficient each high-pressure service pump of pumping cylinder (5) of each high-pressure service pump the groove of valve load-bearing member (6).

6. fuel facility according to claim 1 and 2, it is characterized in that, be used for providing the seat inserting member (11) of the valve seat (8) of described suction valve (3) to be combined in the groove of the pumping cylinder (5) of each high-pressure service pump, and be used for providing the seat inserting member (12) of the valve seat (10) of described delivery valve (4) to be combined in groove with the valve load-bearing member (6) of coefficient each high-pressure service pump of described pumping cylinder.

7. according to each described fuel facility in the claim 1 to 6, it is characterized in that, be used to provide described suction valve (3) valve seat (8) seat inserting member (11) and be used to provide inserting member (12) of the valve seat (10) of described delivery valve (4) to process by stupalith respectively.

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