CN217582343U - Low-pressure fuel oil delivery pump for high-power fuel oil system - Google Patents
Low-pressure fuel oil delivery pump for high-power fuel oil system Download PDFInfo
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- CN217582343U CN217582343U CN202221507668.1U CN202221507668U CN217582343U CN 217582343 U CN217582343 U CN 217582343U CN 202221507668 U CN202221507668 U CN 202221507668U CN 217582343 U CN217582343 U CN 217582343U
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Abstract
The utility model relates to a fuel delivery pump technical field, especially a low pressure fuel delivery pump for high-power fuel system, including diesel oil in the oil tank enters the pump cover through the colating, input the fuel fine filtration by the constant pressure of pump cover, the fuel fine filtration is carried diesel oil to the monoblock pump, the monoblock pump connects the check valve, the check valve passes through the oil pipe and connects the oil tank, sets up relief valve and check valve in the pump cover inner chamber, sets up the gear pump in the pump body inner chamber, the pump cover passes through O type circle and pump body adaptation laminating and sealed fixed; the utility model discloses in limited space, accomplish the design of low pressure fuel delivery pump, this pump is small, compact structure, and it is convenient to install, the operation requirement of guarantee diesel engine power.
Description
Technical Field
The utility model belongs to the technical field of the fuel delivery pump technique and specifically relates to a low pressure fuel delivery pump for high-power fuel oil system.
Background
A low-pressure oil transfer pump used by an oil supply system of a traditional diesel engine straight-line pump is generally integrated on a high-pressure pump, belongs to a plunger type, and can establish primary oil pressure for the high-pressure oil pump, convey diesel oil from an oil tank to an oil inlet of the high-pressure oil pump through an oil pipe and output the oil pressure of about 0.15 MPa. The working principle is that an oil inlet valve and an oil outlet valve are designed at the compression end of an oil pump plunger, the two oil valves are all one-way oil valves with different functions, the oil delivery pump plunger moves upwards under the action of a spring and is far away from the bottom end of the plunger to form a vacuum state, at the moment, the oil inlet valve is opened, the oil outlet valve is closed, and fuel enters a plunger space. When the plunger piston moves upwards to the end point, under the action of the engine, the camshaft of the oil pump pushes the plunger piston of the oil pump to move downwards to compress the fuel oil, at the moment, the oil inlet valve is closed, the oil outlet valve is opened to output the fuel oil, and the purpose of pumping the fuel oil is achieved in a reciprocating mode.
The traditional in-line pump integrated low-pressure fuel delivery pump structure has low output low-pressure fuel pressure and small flow, and can not meet the use requirement of an electric control unit pump. The electric control monoblock pump oil supply system has great potential in the aspect of improving oil supply pressure, has wide market prospect in the application of heavy and large diesel engines, and needs to design a special low-pressure fuel oil delivery pump which is suitable for an electric control monoblock pump fuel oil injection system along with the continuous improvement of the power of the diesel engine, so as to ensure that diesel oil circulates in a low-pressure oil way, supply fuel oil with enough quantity and certain pressure to the monoblock pump and ensure the normal work of the monoblock pump.
SUMMERY OF THE UTILITY MODEL
To the defect, the utility model discloses in limited space, accomplish the design of low pressure fuel delivery pump, this pump is small, compact structure, and it is convenient to install under various operating modes to the transport fuel of low pressure oil circuit fuel pressure 0.6MPa and output flow ≥ 10L/min invariant under, guarantee diesel engine power operation requirement.
In order to solve the technical problem, the utility model discloses the technical method who adopts is:
a low-pressure fuel oil delivery pump for high-power fuel oil system is composed of a pump cover for delivering the diesel oil from fuel tank to pump through coarse filter, a pump cover for delivering the fuel oil at constant pressure to pump cover for fine filter, the fuel fine filtration conveys diesel oil to a single pump, the single pump is connected with a one-way valve, and the one-way valve is connected with an oil tank through an oil pipe; a pressure release valve and a one-way valve are arranged in an inner cavity of the pump cover, a gear pump is arranged in an inner cavity of the pump body, and the pump cover is attached to the pump body in a matched mode through an O-shaped ring and is fixed in a sealed mode.
The utility model discloses technical method's further improvement lies in: one end of a driving shaft in an inner cavity of the pump body is extended out of the pump body, the driving shaft is sequentially sleeved with a driving shifting fork, a butterfly-shaped clamping ring and a framework oil seal from outside to inside, the other end of the driving shaft is matched with an inner hole of a driving wheel, two sides of an extending end of the driving shaft are respectively provided with an oil inlet hole and an oil outlet hole, and one side of the oil outlet hole is provided with a plug.
The utility model discloses technical method's further improvement lies in: a pressure release valve is arranged in an inner cavity on one side of the pump cover, the pressure release valve is transversely arranged on the bottom surface of a spring fixed by a conical pin on the top surface of a plug screw seat, the top surface of the spring and a steel ball are sleeved in a steel sleeve, and the steel ball is positioned on the top surface of the spring.
The utility model discloses technical method's further improvement lies in: and a check valve is arranged in an inner cavity on one side of the pump cover, and is positioned between the elastic cylindrical pin and the plastic valve through a small spring and fixes two ends of the check valve.
The utility model discloses technical method's further improvement lies in: the gear pump is arranged in the inner cavity of the pump body, and the driving wheel gear teeth are matched with the driven wheel gear teeth, and the oil cavity is divided into a low-pressure area and a high-pressure area by the driving wheel gear teeth and the driven wheel gear teeth.
The utility model discloses technical method's further improvement lies in: the inner cavity of one side of the conical pin on the top surface of the plug screw seat and the bottom surface of the spring is provided with a pressure relief hole.
Compared with the prior art, the utility model provides a low pressure fuel delivery pump beneficial effect for high-power fuel oil system as follows:
1. the utility model provides a low pressure fuel delivery pump for high-power fuel oil system, this low pressure fuel delivery pump in limited space, accomplish the design of low pressure fuel delivery pump, and this pump is small, compact structure, and it is convenient to install, under various operating modes to the transport fuel of low pressure oil circuit fuel pressure 0.6MPa and output flow ≥ 10L/min lower invariant, guarantee diesel engine power operation requirement.
Drawings
In order to illustrate the embodiments of the present invention or the technical methods in the prior art more clearly, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts.
FIG. 1 is a schematic view of a low pressure fuel transfer pump for a high power fuel system of the present invention;
FIG. 2 is a schematic bottom view of the structure of FIG. 1;
FIG. 3 is a schematic view of the tangential cross-sectional structure of FIG. 1;
FIG. 4 is a side-cut right view schematic of the structure of FIG. 1;
FIG. 5 is a side-cut left side view of the structure of FIG. 1;
FIG. 6 is a schematic illustration of the gear configuration of the fuel delivery pump of FIG. 1;
reference numbers in the figures: 1-plug by screwing; 5, pump cover; 6-O-shaped ring; 7-steel jacket; 8-steel balls; 9-a spring; 10-a screw plug seat; 11-a pump body; 12-a driven wheel; 13-driving wheel; 14-framework oil seal; 15-butterfly-shaped snap ring; 16-driving a shifting fork; 17-a drive shaft; 18-a resilient cylindrical pin; 19-small spring; 20-a plastic valve; 21-an oil inlet; 22-oil outlet holes; 25-oil chamber.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts all belong to the protection scope of the present invention.
In order to make the above objects, features and advantages of the present invention more comprehensible, the present invention is described in detail with reference to the accompanying drawings and the following detailed description;
principle of an electric control unit pump fuel system: diesel oil is input into a fuel oil rough filter through a diesel oil inlet pipe from a diesel oil tank, the fuel oil rough filter is connected with a low-pressure fuel oil delivery pump inlet hole 21, a low-pressure fuel oil delivery pump outlet hole 22 is connected with a fuel oil fine filter through an oil pipe, the fuel oil fine filter is connected with a plurality of unit pumps through an oil delivery pipe, the unit pumps are respectively connected with a high-pressure oil pipe and a unit pump oil pipe, the high-pressure oil pipe is connected with an oil injector, a one-way valve is installed on the unit pump oil pipe, and the unit pump oil pipe conveys the residual diesel oil into the diesel oil tank.
As shown in fig. 1, 2 and 4, the utility model provides a low-pressure fuel oil delivery pump for high-power fuel oil system, including diesel oil in the oil tank (not shown) entering pump cover 5 through the rough filtration (not shown), the constant pressure input fuel oil fine filtration (not shown) by pump cover 5, the fuel oil fine filtration carries diesel oil to monoblock pump (not shown), monoblock pump connection check valve (not shown), the check valve passes through oil pipe connection oil tank; a pressure release valve and a one-way valve are arranged in the inner cavity of the pump cover 5, a gear pump is arranged in the inner cavity of the pump body 11, and the pump cover 5 is attached to the pump body 11 in a matching mode through an O-shaped ring 6 and is fixed in a sealing mode. One end of a driving shaft 17 in the inner cavity of the pump body 11 extends out of the pump body 11, the driving shaft 17 is sequentially sleeved with a driving shifting fork 16, a butterfly-shaped clamping ring 15 and a framework oil seal 14 from outside to inside, the other end of the driving shaft is matched with the inner hole of a driving wheel 13, two sides of the extending end of the driving shaft 17 are respectively provided with an oil inlet hole 21 and an oil outlet hole 22, and one side of the oil outlet hole 22 is provided with a plug screw 1. In this embodiment, the driven wheel 12 is driven by the driving wheel 13, so that the gear rotates, air in the gear chamber is emptied by the rotation of the gear, the air is vacuumized, fuel oil enters the gear chamber from the oil inlet, and the fuel oil is extruded from the oil outlet by the rotation of the gear.
Further, as shown in fig. 3, a pressure release valve is arranged in an inner cavity on one side of the pump cover 5, the pressure release valve is transversely arranged on the bottom surface of the spring 9 fixed by a conical pin on the top surface of the screw plug seat 10, the top surface of the spring 9 and a steel ball (8) are sleeved in a steel sleeve 7, the steel ball 8 is arranged on the top surface of the spring 9, a pressure release hole is arranged in the inner cavity on one side of the conical pin on the top surface of the screw plug seat 10 and the bottom surface of the spring 9, when the pressure in the pump cover 5 is greater than the constant pressure of 0.6MPa, the pressure release hole is opened and releases the pressure, and when the pressure in the pump cover 5 returns to normal, the pressure release valve is closed.
As shown in fig. 5, a check valve is arranged in the inner cavity of one side of the pump cover 5, and the check valve is positioned between the elastic cylindrical pin 18 and the plastic valve 20 by a small spring 19 and fixed at two ends. The fuel oil arrives at the oil outlet 22 from the oil inlet 21 in a one-way mode, the valve performs oil supplementing loading on a fuel oil system when the gear pump does not work, namely the electric pump works, low-temperature or high-temperature starting can be achieved, the valve is closed reversely after the gear pump works and pressure is built, and at least the fuel oil cannot flow backwards.
As shown in fig. 6, a gear pump is arranged in the inner cavity of the pump body 11, and the gear teeth of the driving wheel 13 are matched with the gear teeth of the driven wheel 12, so that the oil cavity 25 is divided into a low-pressure area and a high-pressure area. The low pressure area of the gear pump is communicated with the coarse filtering oil inlet end and bears the pressure of the oil inlet end, and when the oil pump works, the pressure at the end is negative pressure. And the high-pressure area of the gear pump is communicated with the oil outlet end of the fine filter and bears the high pressure of the fuel system.
In this embodiment, a design process of a low-pressure fuel delivery pump for a high-power fuel system is further provided, where the low-pressure fuel delivery pump supplies fuel to a unit pump at a constant pressure and a constant fuel delivery amount, and the design process of the fuel delivery flow and the design process of the fuel delivery pressure of the low-pressure fuel delivery pump are respectively as follows:
the oil delivery quantity design process of the low-pressure fuel oil delivery pump comprises the following steps:
the flow of the low-pressure fuel oil delivery pump is increased, the oil supply volume of a low-pressure oil way is increased, the pressure fluctuation of the low-pressure oil way is reduced, the fuel oil suction amount of the monoblock pump is ensured, and the cavitation phenomenon of a plunger cavity is avoided; and calculating the theoretical circulating oil supply of the diesel engine to set the power P of the engine e And rated operating speed n e Then the oil supply amount m is circulated f Can be calculated from the following formula:
in the formula: tau is the number of strokes, a four-stroke diesel engine tau =4, i is the number of cylinders of the diesel engine, b e The unit is the fuel consumption rate of the diesel engine and is g/kw.h;
through calculation: circulating oil supply m f ＝0.26g；
According to the formula, the required fuel oil amount per minute is as follows:
0.26×i×r/2÷ρ÷1000＝0.26×8×2500/2÷0.82÷1000＝3.17L/min
in the formula: i is the number of cylinders, r is the rotating speed, and rho is the fuel density;
because the flow of the fuel pump is more than 3 times of the theoretical oil supply quantity, aiming at the calculation result, the flow range of the low-pressure fuel delivery pump is more than or equal to 10L/min;
the oil pressure design process of the low-pressure fuel oil conveying pump comprises the following steps:
the stability of an oil supply system is influenced by the oil supply pressure of a low-pressure oil way, the oil supply pressure is too low, fuel oil cannot be filled in a plunger cavity of a monoblock pump in time, cavitation is caused, the stability of the oil supply system and the oil injection process is influenced, the reliability of the oil supply system is influenced by too high oil supply pressure, and the oil supply pressure is subjected to simulation calculation;
in order to facilitate the realization of model calculation conditions and reduce the influence of multi-parameter coupling factors, in the simulation calculation of the oil supply pressure of the low-pressure oil way, a constant-pressure model is selected for the low-pressure fuel pump, the set rotating speed is 600r/min, and the simulation calculation is carried out by changing the oil supply pressure of the low-pressure oil way to be 0.2MPa, 0.3MPa, 0.4MPa, 0.6MPa, 0.8MPa and 1MPa respectively.
The above-mentioned embodiments are only for describing the preferred embodiments of the present invention, and are not intended to limit the scope of the present invention, and various modifications and improvements made by those skilled in the art without departing from the spirit of the present invention should fall within the protection scope defined by the appended claims.
Claims (6)
1. A low-pressure fuel oil delivery pump for a high-power fuel oil system comprises a pump cover (5) for delivering diesel oil in an oil tank through rough filtration, a pump cover (5) for inputting fuel oil at constant pressure and fine filtration, a unit pump for delivering the diesel oil to the unit pump through the fine filtration, a one-way valve connected with the unit pump, and an oil pipe for connecting the one-way valve with the oil tank; the method is characterized in that: a pressure release valve and a one-way valve are arranged in the inner cavity of the pump cover (5), a gear pump is arranged in the inner cavity of the pump body (11), and the pump cover (5) is attached to the pump body (11) in an adaptive mode through an O-shaped ring (6) and is fixed in a sealing mode.
2. A low pressure fuel delivery pump for a high power fuel system as set forth in claim 1, wherein: one end of a driving shaft (17) in an inner cavity of a pump body (11) is extended out of the pump body (11), the driving shaft (17) is sequentially sleeved with a driving shifting fork (16), a butterfly-shaped clamping ring (15) and a framework oil seal (14) from outside to inside, the other end of the driving shaft is matched with an inner hole of a driving wheel (13), two sides of the extending end of the driving shaft (17) are respectively provided with an oil inlet hole (21) and an oil outlet hole (22), and one side of the oil outlet hole (22) is provided with a plug (1).
3. A low pressure fuel delivery pump for a high power fuel system as set forth in claim 1, wherein: a pressure release valve is arranged in an inner cavity on one side of the pump cover (5), the pressure release valve is transversely arranged on the bottom surface of a spring (9) fixed by a conical pin on the top surface of a screw plug seat (10), the top surface of the spring (9) and a steel ball (8) are sleeved in a steel sleeve (7), and the steel ball (8) is located on the top surface of the spring (9).
4. A low pressure fuel delivery pump for a high power fuel system as set forth in claim 1, wherein: the inner cavity of one side of the pump cover (5) is provided with a one-way valve, and the one-way valve is positioned between the elastic cylindrical pin (18) and the plastic valve (20) by a small spring (19) and fixes two ends of the one-way valve.
5. A low pressure fuel delivery pump for a high power fuel system as set forth in claim 1, wherein: the gear pump in the inner cavity of the pump body (11) is characterized in that a driving wheel (13) is matched with a driven wheel (12) to form gear teeth, and the oil cavity (25) is divided into a low-pressure area and a high-pressure area by the driving wheel and the gear teeth.
6. A low pressure fuel delivery pump for a high power fuel system as set forth in claim 3, wherein: the conical pin on the top surface of the screw plug seat (10) and the inner cavity on one side of the bottom surface of the spring (9) are provided with pressure relief holes.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202221507668.1U CN217582343U (en) | 2022-06-16 | 2022-06-16 | Low-pressure fuel oil delivery pump for high-power fuel oil system |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202221507668.1U CN217582343U (en) | 2022-06-16 | 2022-06-16 | Low-pressure fuel oil delivery pump for high-power fuel oil system |
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| CN217582343U true CN217582343U (en) | 2022-10-14 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202221507668.1U Active CN217582343U (en) | 2022-06-16 | 2022-06-16 | Low-pressure fuel oil delivery pump for high-power fuel oil system |
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| CN (1) | CN217582343U (en) |
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- 2022-06-16 CN CN202221507668.1U patent/CN217582343U/en active Active
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