CN209781093U - A long-maintenance low-pressure fuel supply system for diesel coarse filters - Google Patents

Abstract

The utility model discloses a long-maintenance low-pressure oil supply system for a diesel coarse filter, which comprises a one-way valve and an electric pump, the input end of the one-way valve and the input end of the electric pump are connected to the oil outlet of the fuel tank, and the one-way valve The output terminal and the output terminal of the electric pump are connected in parallel to the inlet of the coarse filter, the outlet of the coarse filter is connected to the oil inlet of the engine through the oil pipe, the oil outlet of the engine is connected to the inlet of the fuel tank, and a pressure sensor is installed on the oil circuit connecting the coarse filter and the engine. The signal output end of the sensor is connected to the signal input end of the controller, and the first signal output end of the controller is connected to the electric pump control end. By adopting the structure of the utility model, without changing the existing fuel oil filter, components such as an electric pump, a check valve and a controller are added to the low-pressure fuel supply pipeline inside the fuel tank, so that the low-pressure fuel supply system can realize automatic positive pressure Oil supply, so as to realize the maintenance of the longer mileage of the diesel coarse filter, and remind the user to replace the coarse filter when it is time for the maintenance of the coarse filter.

Description

A long-maintenance low-pressure fuel supply system for diesel coarse filters

technical field

The utility model belongs to the technical field of fuel supply system design for commercial vehicles, in particular to a long-maintenance low-pressure fuel supply system for a diesel coarse filter.

Background technique

The traditional diesel engine fuel supply system for commercial vehicles is mainly composed of fuel tank, coarse filter, fuel pump, fine filter, high-pressure fuel pump, high-pressure fuel pipe, fuel injector and low-pressure fuel pipeline; Sucked out from the fuel tank, the diesel oil enters the fuel delivery pump through the low-pressure fuel pipeline and the coarse filter, and then is delivered to the high-pressure fuel pump through the fine filter. The atomized injection is injected into the combustion chamber of the engine for combustion, and the remaining diesel oil flows back to the fuel tank through the oil return pipe.

The flow rate of diesel oil flowing through the primary fuel filter at the rated speed of the engine reaches 500L/h, and the fuel impurities filtered by the primary filter will increase the resistance when the fuel flows through the primary filter. The conventional low-pressure fuel supply system is driven by the engine to generate negative pressure to suck the diesel oil out of the fuel tank. Therefore, the low-pressure fuel supply system supplies fuel under negative pressure. When the negative resistance generated by the coarse filter reaches 0.7bar, the fuel at the engine oil inlet If the pressure is less than or equal to 0.3bar, the engine will have insufficient fuel supply and powerlessness; therefore, the maintenance mileage of conventional diesel coarse filters is generally 15,000 km; according to the general vehicle usage, the diesel coarse filter should be replaced every 15 days or so. Bring operational inconvenience and economic burden.

Therefore, there is an urgent need for a long-maintenance low-pressure fuel supply system for diesel oil filters to solve this problem.

Contents of the invention

The purpose of this utility model is to solve the above-mentioned technical problems. The utility model provides a long-maintenance low-pressure fuel supply system for a diesel coarse filter. Electric pump, one-way valve, controller and other components enable the low-pressure fuel supply system to realize automatic positive pressure fuel supply, thereby realizing the maintenance of longer mileage of the diesel coarse filter, and reminding the user to replace the coarse filter when it is time for maintenance of the coarse filter .

According to the technical solution provided by the utility model: a long-maintenance low-pressure fuel supply system for diesel oil filter, including a check valve and an electric pump, the input end of the check valve and the input end of the electric pump are connected to the fuel tank Oil outlet, the output end of the check valve and the output end of the electric pump are connected in parallel to the inlet of the coarse filter, the outlet of the coarse filter is connected to the oil inlet of the engine through the oil pipe, and the oil outlet of the engine is connected to the fuel oil outlet. Tank inlet port, a pressure sensor is installed on the oil line connecting the coarse filter and the engine, the signal output end of the pressure sensor is connected to the signal input end of the controller, and the first signal output end of the controller is connected to the Electric pump control terminal.

As a further improvement of the utility model, the second signal output end of the controller is connected to the indicator light control end.

As a further improvement of the utility model, the joints at both ends of the oil pipe can be connected by hollow bolts or quick-plug joints.

Compared with the prior art, the utility model has the following advantages:

1. The utility model has the advantages of simple structure, easy realization and low cost.

2. Without changing the existing primary fuel filter, the utility model adds components such as an electric pump, a check valve and a controller to the low-pressure fuel supply pipeline inside the fuel tank, so that the low-pressure fuel supply system can realize automatic positive pressure supply. Oil, so as to realize the maintenance of the longer mileage of the diesel coarse filter, and remind the user to replace the coarse filter when it is time for the maintenance of the coarse filter.

Description of drawings

Fig. 1 is the structural representation of the utility model.

Detailed ways

Below in conjunction with accompanying drawing, the specific embodiment of the present utility model is described further.

In Fig. 1, it includes a fuel tank 1, a coarse filter 2, a pressure sensor 3, an engine 4, a one-way valve 5, an electric pump 6, a controller 7, an indicator light 8, and the like.

As shown in Figure 1, the utility model is a long-maintenance low-pressure oil supply system for a diesel coarse filter, which includes a check valve 5 and an electric pump 6, and the input end of the check valve 5 and the input end of the electric pump 6 are connected to the fuel tank 1 oil outlet, the output end of the check valve 5 and the output end of the electric pump 6 are connected in parallel through the oil pipe to the inlet of the coarse filter 2, the outlet of the coarse filter 2 is connected to the oil inlet of the engine 4, and the oil outlet of the engine 4 is connected to the fuel tank through the oil pipe 1 oil inlet, connect the coarse filter 2 and the oil on the engine 4 and install the pressure sensor 3, the signal output end of the pressure sensor 3 is connected to the signal input end of the controller 7, and the first signal output end of the controller 7 is connected to the electric pump 6 to control end, the second signal output end of the controller 7 is connected to the control end of the indicator light 8 .

The joints at both ends of the oil pipe can be connected by hollow bolts or quick-plug joints.

The installation process of the present utility model is as follows:

Here, it is set that the pressure detected by the pressure sensor 3 at the oil inlet of the engine 4 is P1, the pressure building capability of the electric pump 6 is P2, and the resistance pressure of the coarse filter 2 is P3. The engine 4 is started, and the diesel oil is extracted from the fuel tank 1 through the engine 4 fuel delivery pump to supply the engine 4. At this time, the low-pressure system supplies fuel under negative pressure. When the pressure sensor 3 detects that P1 is greater than the pressure sensor 3 signaling threshold, the The diesel oil flows through the coarse filter 2 smoothly, and the oil supply is normal. The controller 7 controls the electric pump 6 to not work. The diesel oil passes through the check valve 5 and then passes through the coarse filter 2 to supply oil to the engine 4; At this time, the oil supply is insufficient at this time, the pressure sensor 3 sends a letter to the controller 7, and the controller 7 controls the electric pump 6 to start working. Reverse closed state. Due to the work of the electric pump 6, the low pressure system becomes a positive pressure oil supply, and the system can supply oil normally. With the work of the system, the resistance pressure P3 of the coarse filter 2 will gradually increase. When P1 is less than or equal to the threshold value of the pressure sensor 3 again, the controller 7 will control the indicator light 8 to flash to remind the driver to replace the coarse filter 2, thereby realizing The coarse filter 2 has long maintenance requirements, reducing maintenance costs for users. The greater the pressure building capacity P2 of the selected electric pump 6 is, the longer the maintenance cycle of the coarse filter 2 will be.

Claims (3)

1. the utility model provides a diesel oil coarse strainer long dimension protects low pressure oil feeding system which characterized in that: the system comprises a one-way valve (5) and an electric pump (6), wherein the input end of the one-way valve (5) is connected with the input end of the electric pump (6) to form an oil outlet of a fuel tank (1), the output end of the one-way valve (5) is connected with the output end of the electric pump (6) in parallel to form an inlet of a coarse filter (2), the outlet of the coarse filter (2) is connected with an oil inlet of an engine (4) through an oil pipe, the oil outlet of the engine (4) is connected with an oil inlet of the fuel tank (1), the coarse filter (2) is connected with a pressure sensor (3) arranged on an oil way of the engine (4), the signal output end of the pressure sensor (3) is connected with the signal input end of a controller (7), and a first signal output end of the controller (7) is connected.

2. The diesel oil strainer long-maintenance low-pressure oil supply system as set forth in claim 1, wherein: and a second signal output end of the controller (7) is connected with a control end of the indicator lamp (8).

3. The diesel oil strainer long-maintenance low-pressure oil supply system as set forth in claim 1, wherein: the joints at the two ends of the oil pipe can be connected by hollow bolts or quick connectors.