CN203717206U - Oil pumping mechanism for common rail engine - Google Patents

Abstract

The utility model relates to an oil pumping mechanism for a common rail engine. The oil pumping mechanism comprises two high-pressure oil pumps; oil outlets of the two high-pressure oil pumps are respectively led to a connecting block through two high-pressure oil inlet pipes; a common oil chamber communicated with the two high-pressure oil inlet pipes is formed in the connecting block and two high-pressure oil outlet pipes are led out of the common oil chamber; the high-pressure oil outlet pipes are communicated with the common oil chamber through high-pressure fuel oil ducts; a low-pressure oil chamber is formed in the connecting block; the connecting block is connected with a pressure relief pipeline for communicating the common oil chamber with the low-pressure oil chamber; the pressure relief pipeline is provided with a safety valve; a sensible sensor is arranged on the connecting block and is connected with a safety alarm. The oil pumping mechanism can ensure continuous supply of fuel oil, and the safety and the reliability of fuel oil supply are improved.

Description

Common rail engine oil pump mechanism

technical field

The utility model relates to the field of common rail engines, in particular to an oil pump mechanism for common rail engines.

Background technique

For marine diesel engines, it is required that in the event of a failure of related parts, the diesel engine should still be able to work under partial load, so as to ensure the safety of the entire ship. Because it is difficult to provide high-pressure fuel with an external electric pump, the high-pressure common-rail diesel engine can only pump fuel with a high-pressure common-rail pump. The failure of the high-pressure common-rail pump will directly cause the engine to stop due to the loss of fuel supply, which cannot meet the requirements. Requirements for marine diesel engines.

Utility model content

The technical problem to be solved by the utility model is to provide a common rail engine oil pumping mechanism, which can ensure the continuous supply of fuel and improve the safety and reliability of fuel supply.

In order to solve the above-mentioned technical problems, the common rail engine oil pump mechanism of the present invention includes two high-pressure oil pumps, and its structural feature is that the oil outlets of the two high-pressure oil pumps are respectively led to a connecting block through two high-pressure oil inlet pipes, connected There is a public oil chamber connected to the two high-pressure oil inlet pipes inside the block, and two high-pressure oil outlet pipes are drawn from the common oil chamber, and the high-pressure oil outlet pipes communicate with the public oil chamber through high-pressure fuel holes; There is a low-pressure oil chamber, and the connection block is connected with a pressure relief pipeline for connecting the common oil chamber and the low-pressure oil chamber, and a safety valve is installed on the pressure relief pipeline, and a sensor that can sense the impact force in the low-pressure oil chamber is installed on the connection block. device, a safety alarm is connected to the sensing device.

With the above structure, the high-pressure fuel of the two high-pressure oil pumps is collected into the common oil chamber, and then distributed to the two rows of cylinders to ensure that the engine can still work without stopping even if only one high-pressure oil pump is working, which improves the safety of the engine and reliability; by installing a safety valve, when the pressure of the high-pressure oil circuit is too high, the safety valve can be opened in time to release the pressure, and a safety alarm can be set to give an alarm, which is convenient for the staff to take measures.

The sensing device is a pressure sensor.

The sensing device is a temperature sensor.

The high-pressure oil inlet pipe and the high-pressure oil outlet pipe are both double-layer oil pipes. The double-layer oil pipes are formed by inner and outer two-layer pipes and an annular lumen is formed between the two-layer pipes. A leaking oil chamber is opened in the connecting block and the leaking oil chamber It communicates with the annular lumens of the above-mentioned double-layer oil pipes. A liquid level sensor that can detect the liquid level of the leaking oil chamber is installed on the connecting block, and a leakage alarm is connected to the liquid level sensor. A double-layer oil pipe and a leakage oil chamber are set up. When the inner pipe of the double-layer oil pipe bursts and leaks oil, the liquid level sensor in the leakage oil chamber sends an alarm trigger signal to the leakage alarm to notify the staff to take measures.

The double-layer oil pipe is connected with the connection block through an insert sleeve, and the insert sleeve is embedded on the connection block and forms a gap cavity communicating with the inner cavity of the insert sleeve with the connection block. The inner layer of the double-layer oil pipe The pipe passes through the insert sleeve and communicates with the high-pressure fuel hole; the annular lumen of the double-layer oil pipe communicates with the inner cavity of the insert sleeve, and each gap cavity communicates with the leak oil cavity through the oil leakage pipe.

A collection oil chamber communicated with both the leakage oil chamber and the low-pressure oil chamber is provided in the connection block, and an oil return port communicated with the collection oil chamber is provided on the connection block. A collection oil chamber is set to collect leaked and depressurized fuel, and the fuel is recovered into the fuel tank through the oil return port to avoid waste.

A high-pressure oil port communicating with the common oil chamber is opened on the connecting block, and a high-pressure oil plug is installed on the high-pressure oil port.

To sum up, the oil pumping mechanism of the utility model collects the high-pressure fuel of the two high-pressure oil pumps, monitors the fuel pressure, and distributes it to the common rail pipe after throttling, so as to ensure the continuous supply of fuel and improve the efficiency of the common rail. The reliability of the engine, at the same time, the utility model also integrates the functions of pressure relief alarm and leakage alarm, which increases the safety of the common rail engine.

Description of drawings

Below in conjunction with accompanying drawing and specific embodiment the utility model is described in further detail:

Fig. 1 is the three-dimensional structure schematic diagram of the present utility model;

Fig. 2 is the top view structural representation of the utility model;

Fig. 3 is the right view structural representation of the utility model;

Fig. 4 is a schematic cross-sectional structure diagram along the A-A direction in Fig. 2;

FIG. 5 is an enlarged view of the structure inside the dotted circle in FIG. 4 .

Detailed ways

Referring to the accompanying drawings, the common rail engine oil pump mechanism of the present utility model includes two high-pressure oil pumps 1, and the oil outlets of the two high-pressure oil pumps 1 are respectively led to a connecting block 3 through two high-pressure oil inlet pipes 2, and the connecting block 3 is provided with a There is a common oil chamber 4 communicating with the two high-pressure oil inlet pipes 2, and two high-pressure oil outlet pipes 5 are drawn from the common oil chamber 4, and the high-pressure oil outlet pipe 5 communicates with the common oil chamber 4 through a high-pressure fuel hole 6. A low-pressure oil chamber 7 is also provided in the connection block 3, and a pressure relief pipeline 8 for communicating with the public oil chamber 4 and the low-pressure oil chamber 7 is connected to the connection block 3, and a safety valve 9 is installed on the pressure relief pipeline 8. An induction device 10 that can sense the impact force in the low-pressure oil chamber 7 is installed on the block 3, and a safety alarm 11 is connected to the above-mentioned induction device. Among them, the sensing device is used to sense the impact force in the low-pressure oil chamber, and sense whether the safety valve is opened by sensing whether there is an impact force. When the safety valve is opened, it means that the oil pressure in the oil circuit is too high. At this time, a signal is sent to the safety alarm. device. The sensing device 10 may adopt a pressure sensor or a temperature sensor capable of sensing fluid impact.

In the above structure, the high-pressure fuel of the two high-pressure oil pumps is collected to the common oil chamber, and then distributed to the two rows of cylinders to ensure that the engine can still work without stopping even if only one high-pressure oil pump is working, which improves the safety of the engine and reliability; by installing a safety valve, when the pressure of the oil circuit is too high, the safety valve can be opened in time to relieve the pressure to ensure the safety of the entire fuel system, and a safety alarm can be set to give an alarm, which is convenient for the staff to take measures.

With reference to the accompanying drawings, the high-pressure oil inlet pipe 2 and the high-pressure oil outlet pipe 5 are both double-layer oil pipes. The double-layer oil pipes are formed by inner and outer two-layer pipes and an annular lumen 12 is formed between the two-layer pipes. There is a leakage oil pipe in the connecting block 3. cavity 13 and the leakage oil cavity 13 communicates with the annular lumen 12 of the above-mentioned double-layer oil pipes. Alarm 20. When the inner pipe of the double-layer oil pipe bursts and leaks oil, the liquid level sensor 14 in the leaking oil chamber 13 sends an alarm trigger signal to the leakage alarm 20 to notify the staff to take measures.

Referring to the accompanying drawings, for the installation of the double-layer oil pipe, the double-layer oil pipe is connected to the connection block 3 through the insertion sleeve 17, and the insertion sleeve 17 is embedded on the connection block 3 and forms a connection with the connection block 3. The gap cavity 18 connected to the inner cavity of the sleeve 17, the inner tube of the double-layer oil pipe passes through the insert sleeve 17 and communicates with the high-pressure fuel hole 6; the annular lumen 12 of the double-layer oil pipe communicates with the inner cavity of the insert sleeve 17, and each gap The chamber 18 communicates with the leakage oil chamber 13 through an oil leakage pipe 19 .

Referring to the drawings, the connecting block 3 is provided with a collecting oil chamber 15 communicating with both the leakage oil chamber 13 and the low-pressure oil chamber 7 , and the connecting block 3 is provided with an oil return port 16 communicating with the collecting oil chamber 15 . A collection oil chamber 15 is provided to collect leaked and depressurized fuel, and the fuel is recovered into the fuel tank through the oil return port 16 .

Referring to the drawings, the connection block 3 is provided with a high-pressure oil port communicating with the common oil chamber 4 and a high-pressure oil plug 21 is installed on the high-pressure oil port.

To sum up, the utility model is not limited to the above specific embodiments. Those skilled in the art can make several changes and modifications without departing from the spirit and scope of the present utility model. The protection scope of the utility model should be based on the claims of the utility model.

Claims (7)

1. one kind is total to rail engine pump oil machine structure, comprise two high pressure oil pumps (1), the oil outlet that it is characterized in that described two high pressure oil pumps (1) causes on a contiguous block (3) by two high pressure oil inlet pipes (2) respectively, contiguous block (3) inside offers on the public oil pocket (4) that is communicated with two high pressure oil inlet pipes (2) and this public oil pocket (4) and leads to two high pressure oil outlet tubes (5), between high pressure oil outlet tube (5) and public oil pocket (4), is communicated with by high pressure fuel duct (6); In described contiguous block (3), also offer low pressure oil pocket (7), on contiguous block (3), be connected with on pressure relief pipe (8) for being communicated with public oil pocket (4) and low pressure oil pocket (7) and this pressure relief pipe (8) safety valve (9) is installed, the induction installation (10) that can respond to the interior impact force of low pressure oil pocket (7) is installed on contiguous block (3), on above-mentioned induction installation, is connected with safety alarm (11).

2. rail engine pump oil machine structure altogether as claimed in claim 1, is characterized in that described induction installation (10) is pressure transducer.

3. rail engine pump oil machine structure altogether as claimed in claim 1, is characterized in that described induction installation (10) is temperature transducer.

4. rail engine pump oil machine structure altogether as claimed in claim 1, it is characterized in that described high pressure oil inlet pipe (2) and high pressure oil outlet tube (5) are double layer oil pipe, double layer oil pipe is by interior, between outer two-layer pipe formation and two-layer pipe, form perimetrical lumen (12), in contiguous block (3), offering leakage oil pocket (13) and this leakage oil pocket (13) is all communicated with the perimetrical lumen (12) of above-mentioned each double layer oil pipe, on contiguous block (3), be provided with and can detect the liquid level sensor (14) that leaks oil pocket (13) liquid level, on liquid level sensor (14), be connected with leakage alarm (20).

5. rail engine pump oil machine structure altogether as claimed in claim 4, it is characterized in that being connected by plug-in mounting cover (17) between described double layer oil pipe and contiguous block (3), plug-in mounting cover (17) be inlaid in contiguous block (3) upper and and contiguous block (3) between form a spatia (18) being communicated with plug-in mounting cover (17) inner chamber, the inner tube of double layer oil pipe is passed plug-in mounting cover (17) and is communicated to high pressure fuel duct (6); The perimetrical lumen (12) of double layer oil pipe is communicated with plug-in mounting cover (17) inner chamber, and each spatia (18) is communicated with leakage oil pocket (13) by leakage of oil pipeline (19).

6. rail engine pump oil machine structure altogether as claimed in claim 4, it is characterized in that offering in described contiguous block (3) with leak that oil pocket (13) and low pressure oil pocket (7) be all communicated with collect oil pocket (15), on contiguous block (3), offer and the return opening (16) that collects oil pocket (15) and be communicated with.

7. the common rail engine pump oil machine structure as described in any one in claim 1 to 6, is characterized in that offering on described contiguous block (3) on the high pressure hydraulic fluid port that is communicated with public oil pocket (4) and this high pressure hydraulic fluid port high pressure oil stifled (21) is installed.