CN217380760U - Electric pump for diesel engine - Google Patents

Abstract

The utility model discloses an electric pump for diesel engine, include: the pump body comprises a shell, a coil assembly arranged in the shell, a plunger assembly arranged in the middle of the coil assembly, a one-way valve assembly arranged above the plunger assembly and an upper end cover limiting the one-way valve assembly on the coil assembly, wherein the bottom of the shell is provided with an oil inlet, the upper end cover is provided with an oil outlet, a flow passage is formed between the oil inlet and the oil outlet, and the one-way valve assembly and the plunger assembly are vertically arranged in the flow passage; the plug is fastened on the pump body and used for connecting the coil assembly and a power supply, and an oil outlet communicated to the oil outlet is formed in the plug. The utility model provides an electric pump for diesel engine, simple structure, output pressure is stable, and the operation is stable.

Description

Electric pump for diesel engine

Technical Field

The utility model belongs to the technical field of auto-parts, in particular to an electric pump for diesel engine.

Background

In a fuel system of a modern diesel engine, particularly a high-pressure common rail system, a hand oil pump is widely applied. The manual oil pump is generally assembled with the water separator to form a water separator assembly, and the manual oil pump has the main functions of discharging air in the filter and filling diesel oil in the filter after the engine is stopped, so that the phenomenon that the engine cannot be started due to the fact that a large amount of gas exists in the filter tank is avoided. Many drivers are also accustomed to filling the filter with diesel oil by using the manual oil pump when replacing the filter, and the filter is not filled with diesel oil first and then assembled on the manual oil pump seat according to requirements. Therefore, the use frequency of the hand oil pump is greatly improved, and higher requirements are provided for the use performance of the hand oil pump.

The requirements are reflected in two aspects: firstly, the oil pumping capacity requires that the hand pump can fill the whole filter quickly; taking a current heavy truck as an example, the volume of a filter tank is about 2L, taking an imported hand oil pump of a certain foreign brand as an example, the hand oil pump is used for pumping oil at a dirty oil end, the oil pumping quantity per time is 25ml, and the oil pumping times are more than 80; if a hand pump for pumping oil at a clean end is adopted, the oil pumping frequency is often more than 150 times; second, durability, frequent use, places a demand on the durability of the oil pump, and has a high demand on performance stability in life-span operation.

Due to the quality problem of diesel oil, the manual oil pump for pumping oil from a dirty oil end is adopted, the internal one-way valve of the manual oil pump is often stuck and does not work, the function failure of the manual oil pump is directly caused, particularly, when the engine needs to exhaust after being stopped, air in a filter tank cannot be discharged, the engine cannot be started, and great trouble is caused to a user. If the manual oil pump for pumping oil at the clean end is adopted, the oil pumping frequency is usually more than 2 times of that of the dirty oil end due to the small formed negative pressure effect.

In the prior art, most electric pumps for replacing manual oil pumps adopt 4-5 rollers which are driven by a motor to rotate at a high speed, and under the action of inertia force, the roller bodies move smoothly in a sliding chute to change the volume of a cavity so as to form negative pressure and positive pressure conditions under the drive of a high-speed rotating eccentric wheel in a pump cavity, so that diesel oil is sucked from an oil tank and is extruded out. The electric pump of this structure ubiquitous, because the problem of high-speed rotation brings the wearing and tearing problem, output pressure is too high simultaneously, needs design relief valve in the pump chamber to control pressure, and the structure is complicated.

SUMMERY OF THE UTILITY MODEL

Based on the above problem, the utility model aims at providing an electric pump for diesel engine, simple structure can avoid high-speed motion and high-pressure output problem.

In order to overcome the deficiency of the prior art, the utility model provides a technical scheme is:

an electric pump for a diesel engine, comprising:

the pump body comprises a shell, a coil assembly arranged in the shell, a plunger assembly arranged in the middle of the coil assembly, a one-way valve assembly arranged above the plunger assembly and an upper end cover limiting the one-way valve assembly on the coil assembly, wherein the bottom of the shell is provided with an oil inlet, the upper end cover is provided with an oil outlet, a flow passage is formed between the oil inlet and the oil outlet, and the one-way valve assembly and the plunger assembly are vertically arranged in the flow passage;

and the plug is fastened on the pump body and used for connecting the coil assembly and a power supply, and an oil outlet communicated to the oil outlet is formed in the plug.

In some embodiments, the plunger assembly includes a guide tube abutting against the housing and extending to the oil inlet, an armature movably disposed in the guide tube from top to bottom, a first limit plate fixed to an upper portion of an inner cavity of the armature, and a first valve core disposed in the inner cavity of the armature, a first elastic member is disposed between the armature and the housing, a second elastic member is disposed between the first valve core and the first limit plate, and a plurality of first through holes communicated to the inner cavity of the armature are disposed on the first limit plate.

In some embodiments, a first limiting groove matched with the first elastic member is formed in the lower portion of an inner cavity of the armature, a second limiting groove matched with the first limiting plate is formed in the upper portion of the inner cavity of the armature, a plurality of flanging structures are circumferentially arranged on the first limiting plate and are in interference fit with the armature, and a first sealing surface in sealing fit with the first valve core is formed in the inner cavity of the armature.

In some embodiments, a first sealing ring is respectively arranged between the lower end of the guide pipe and the outer shell and between the upper end of the guide pipe and the check valve assembly.

In some of them embodiments, the shell includes main part and downwardly extending's oil feed portion, the oil feed portion with be formed with the mount table between the main part, be equipped with the second sealing washer on the mount table.

In some of these embodiments, a third sealing ring is provided on the outer periphery of the plug to sealingly engage the mounting surface.

In some embodiments, the check valve assembly includes a valve body, a second valve core disposed in the valve body, a second limiting plate disposed in the valve body, and a third elastic member disposed between the second valve core and the second limiting plate, wherein a plurality of second through holes are disposed on the second limiting plate, and a second sealing surface sealingly engaged with the second valve core is disposed in the valve body.

In some embodiments, the coil assembly includes a coil frame, a coil wound on the coil frame, a magnetic ring installed in the coil frame, and magnetic plates respectively disposed at upper and lower ends of the coil, and an input terminal assembly connected to the coil is installed on the magnetic plate at the upper end.

In some embodiments, an elastic washer is disposed between the lower magnetic conduction plate and the casing.

In some embodiments, the plug comprises a plug body, a PCB installed in the plug body, a first blade assembly and a second blade assembly fixed on the PCB, wherein the first blade assembly is connected with a power supply, and the second blade assembly is connected with the input terminal assembly.

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

1. by adopting the electric pump, the problems that a driver wastes time and labor when using a manual oil pump in filter replacement and shutdown exhaust are solved;

2. the electric pump has a simple structure, does not have large pressure output, and ensures the working stability of the engine;

3. the electric pump is arranged at the clean oil end, so that the problem that the oil suction one-way valve at the dirty oil end fails can be solved;

4. the electric pump adopts reciprocating motion's plunger pump form, compares traditional motor drive's high-speed oil pump of adorning soon, and product simple structure does not have friction and striking under the great frequency that high-speed rotation brought simultaneously, has higher reliability.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to these drawings without creative efforts.

FIG. 1 is a schematic structural view of an embodiment of an electric pump for a diesel engine according to the present invention;

fig. 2 is a schematic structural diagram of a plunger assembly according to an embodiment of the present invention;

fig. 3 is a schematic view of a matching structure of the armature and the first limiting plate according to the embodiment of the present invention;

fig. 4 is a schematic structural diagram of a check valve assembly according to an embodiment of the present invention;

FIG. 5 is a schematic sectional view taken along line A-A of FIG. 4;

fig. 6 is a schematic structural diagram of a plug in an embodiment of the present invention;

fig. 7 is a schematic structural diagram of a coil assembly according to an embodiment of the present invention;

fig. 8 is a schematic view of the magnetic field distribution in the embodiment of the present invention;

wherein:

1. a pump body; 1-1, a shell; 1-1a and an oil inlet; 1-1b, a mounting table; 1-2, a coil component; 1-2a, a coil skeleton; 1-2b, a coil; 1-2c, a magnetic conductive ring; 1-2d, magnetic conductive plate; 1-3, plunger assembly; 1-3a, a guide pipe; 1-3b, an armature; 1-3c, a first valve core; 1-3d, a first elastic member; 1-3e, a second elastic member; 1-3f, a first limiting plate; 1-3f1, first perforation; 1-4, a one-way valve assembly; 1-4a, a valve body; 1-4b, a second valve core; 1-4c and a second limiting plate; 1-4c1, second perforation; 1-4d, a third elastic member; 1-5, an upper end cover;

2. a plug; 2-1, a plug body; 2-1a, an oil outlet; 2-2, PCB board; 2-3, a first inserting sheet; 2-4, a second inserting sheet;

3. an input terminal assembly;

4. a first seal ring;

5. an elastic washer;

6. a second seal ring;

7. and a third sealing ring.

Detailed Description

The above-described scheme is further illustrated below with reference to specific examples. It should be understood that these examples are for illustrative purposes and are not intended to limit the scope of the present invention. The conditions used in the examples may be further adjusted according to the conditions of the particular manufacturer, and the conditions not specified are generally conditions used in routine experiments.

Referring to fig. 1, which is a schematic structural view of an embodiment of the present invention, there is provided an electric pump for a diesel engine, including a pump body 1 and a plug 2 tightly fitted with the pump body 1, wherein, the pump body 1 comprises a shell 1-1, a coil component 1-2 arranged in the shell 1-1, a plunger component 1-3 arranged in the middle of the coil component 1-2, a one-way valve component 1-4 arranged above the plunger component 1-3 and an upper end cover 1-5 for limiting the one-way valve component 1-4 on the coil component 1-2, an oil inlet 1-1a is arranged at the bottom of the shell 1-1, an oil outlet is arranged on the upper end cover 1-5, a flow passage is formed between the oil inlet 1-1a and the oil outlet, and the check valve component 1-4 and the plunger component 1-3 are vertically arranged in the flow passage.

The plug 2 is used for connecting the coil assembly 1-2 with a power supply, an oil outlet 2-1a communicated with the oil outlet is formed in the plug 2, the coil assembly 1-2 is connected with the power supply through the plug 2 to supply power to the coil assembly 1-2, and therefore a closed magnetic circuit is formed between the coil assembly 1-2 and the shell 1-1.

Specifically, referring to fig. 2, the plunger assembly 1-3 comprises a guide pipe 1-3a abutting against the housing 1-1 and extending to the oil inlet 1-1a, an armature 1-3b movably arranged in the guide pipe 1-3a up and down, a first limit plate 1-3f fixed on the upper part of the inner cavity of the armature 1-3b, a first valve core 1-3c arranged in the inner cavity of the armature 1-3b, a first elastic member 1-3d arranged between the armature 1-3b and the housing 1-1, a second elastic member 1-3e arranged between the first valve core 1-3c and the first limit plate 1-3f, and a plurality of first through holes 1-3f1 communicated with the inner cavity of the armature 1-3b, preferably, the first elastic members 1-3d, The second elastic members 1 to 3e are springs, the first elastic members 1 to 3d are used for resetting the armatures 1 to 3b, and the second elastic members 1 to 3e are used for sealing and resetting the first valve cores 1 to 3 c.

In order to facilitate the installation of the first elastic part 1-3d, a first limiting groove matched with the first elastic part 1-3d is arranged at the lower part of the inner cavity of the armature 1-3b, a second limiting groove matched with the first limiting plate 1-3f is arranged at the upper part of the inner cavity of the armature 1-3d, a first sealing surface in sealing fit with the first valve core 1-3c is arranged in the inner cavity of the armature 1-3b, in the embodiment, the first valve core 1-3c is in conical surface fit with the first sealing surface, and the guide pipe 1-3a is a copper pipe. Referring to fig. 3, a plurality of flanging structures are axially arranged on the first limit plates 1 to 3f and are in interference fit with the armatures 1 to 3b, and the flanging structures can prevent the first limit plates 1 to 3f from being separated, so that the structural stability is improved.

In order to realize the sealing of the positive pressure area and the negative pressure area of the electric pump, first sealing rings 4 are respectively arranged between the lower end of the guide pipe 1-3a and the shell 1-1 and between the upper end of the guide pipe 1-3a and the check valve component 1-4.

In this example, the housing 1-1 comprises a main body part and a downward extending oil inlet part, a mounting table 1-1b is formed between the oil inlet part and the main body part, when in use, the mounting table 1-1b is mounted at the position of an oil outlet of the filter, and in order to further ensure the sealing of a positive pressure area and a negative pressure area of the electric pump, a second sealing ring 6 is arranged on the mounting table 1-1 b.

In order to prevent the electric pump from leaking, a third seal ring 7 is provided on the outer periphery of the plug 2 to be in sealing engagement with the mounting surface of the filter.

Referring to fig. 4 and 5, the check valve assembly 1-4 includes a valve body 1-4a, a second valve core 1-4b disposed in the valve body 1-4a, a second position-limiting plate 1-4c disposed in the valve body 1-4a, and a third elastic member 1-4d disposed before the second valve core 1-4b and the second position-limiting plate 1-4c, where the third elastic member 1-4d is used for resetting the second valve core 1-4b, the second position-limiting plate 1-4c is provided with a plurality of second through holes 1-4c1 for discharging fluid in the guide pipe 1-3a, a second sealing surface sealingly engaged with the second valve core 1-4b is disposed in the valve body 1-4a, in this example, the third elastic member 1-4d is a spring, the second position-limiting plate 1-4c is circumferentially provided with a plurality of flange structures and is in interference fit with the valve body 1-4a, and plane sealing is formed between the second valve core 1-4b and the second sealing surface.

Referring to fig. 7, the coil assembly 1-2 includes a coil frame 1-2a, a coil 1-2b wound around the coil frame 1-2a, a magnetic ring 1-2c installed in the coil frame 1-2a, and magnetic conductive plates 1-2d respectively installed at upper and lower ends of the coil 1-2b, and an input terminal assembly 3 connected to the coil 1-2b is installed on the magnetic conductive plate 1-2d located at the upper end. The arrangement of the magnetic rings 1-2c and the magnetic plates 1-2d can increase the initial magnetic flux, referring to fig. 8, the armatures 1-3b are magnetized in a magnetic field, the step direction is consistent with the main magnetic field, in the initial state, the step direction of the armatures 1-3b is positioned above the step direction center of the coil, and when the armature is electrified, the two central lines are superposed, so that the armatures 1-3b are driven to move downwards.

In order to further optimize the implementation effect of the utility model, an elastic washer 5 is arranged between the magnetic conduction plate 1-2d at the lower end and the shell 1-1, on one hand, the flexible fixation of the coil assembly 1-2 can be realized, the shock absorption effect is improved, and on the other hand, the sealing performance of the positive pressure region and the negative pressure region can be improved.

Referring to fig. 6, the plug 2 includes a plug body 2-1, a PCB 2-2 installed in the plug body 2-1, a first blade assembly and a second blade assembly fixed on the PCB 2-2, the first blade assembly includes a positive and a negative first blades 2-3 respectively connected to the power supply, the second blade assembly includes a positive and a negative second blades 2-4 respectively connected to the input terminal assembly 3, thereby realizing the electrical connection of the coil 1-2b and the power supply. The voltage signal of the PCB 2-2 is a square wave, i.e. one square wave period includes a certain power-on time and power-off time.

The utility model discloses a working process does:

when the electric pump works, the coil 1-2b receives a voltage signal of a square wave of the PCB 2-2, the coil 1-2b is electrified to magnetize the armature to overcome the first elastic part 1-3d to move downwards, at the moment, the first valve core 1-3c is opened, and the one-way valve component 1-4 is closed, so that positive pressure and negative pressure areas of an inner cavity of the electric pump are isolated; when the coil 1-2b is powered off, the armature 1-3b moves upwards under the action of the first elastic part 1-3d, at the moment, the first valve core 1-3c can be quickly changed from an opening state to a closing state (when the movement direction of the armature 1-3b is consistent with the movement direction of the fluid and the movement speed of the armature 1-3b is greater than or equal to the fluid speed, the first valve core 1-3c can be closed under the action of the first elastic part 1-3 d), the armature 1-3b moves upwards to discharge air in the pump cavity, the one-way valve component 1-4 is opened, a negative pressure is formed in the cavity in the pump body 1 to suck diesel oil into a filter from an oil tank, the plunger component 1-3 is continuously opened and closed under the action of a voltage signal of the PCB board 2-2, and correspondingly, the one-way valve component 1-4 is continuously opened and closed, the oil absorption process is achieved (fluid flow direction is shown by arrows in figure 1). The rated flow and the negative pressure capacity of the electric pump can be adjusted by the frequency and the working stroke of the actions of the armatures 1-3 b.

The above examples are only for illustrating the technical conception and the features of the present invention, and the purpose thereof is to enable one skilled in the art to understand the contents of the present invention and to implement the present invention, which should not be construed as limiting the scope of the present invention. All equivalent changes and modifications made according to the spirit of the present invention should be covered by the protection scope of the present invention.

Claims (10)

1. An electric pump for a diesel engine, comprising:

the pump body comprises a shell, a coil assembly arranged in the shell, a plunger assembly arranged in the middle of the coil assembly, a one-way valve assembly arranged above the plunger assembly and an upper end cover limiting the one-way valve assembly on the coil assembly, wherein the bottom of the shell is provided with an oil inlet, the upper end cover is provided with an oil outlet, a flow passage is formed between the oil inlet and the oil outlet, and the one-way valve assembly and the plunger assembly are vertically arranged in the flow passage;

the plug is fastened on the pump body and used for connecting the coil assembly and a power supply, and an oil outlet communicated to the oil outlet is formed in the plug.

2. The electric pump for a diesel engine according to claim 1, characterized in that: the plunger assembly comprises a guide pipe, an armature, a first limiting plate and a first valve core, wherein the guide pipe is abutted to the outer shell and extends to the oil inlet, the armature is movably arranged in the guide pipe from top to bottom, the first limiting plate is fixed to the upper portion of the inner cavity of the armature, the first valve core is arranged in the inner cavity of the armature, a first elastic piece is arranged between the armature and the outer shell, a second elastic piece is arranged between the first valve core and the first limiting plate, and a plurality of first through holes communicated to the inner cavity of the armature are formed in the first limiting plate.

3. The electric pump for a diesel engine according to claim 2, characterized in that: the lower part of armature inner chamber be equipped with the first spacing groove that first elastic component matches, the upper portion of armature inner chamber be equipped with the second spacing groove that first limiting plate matches, first limiting plate week be equipped with a plurality of flange structure and with armature interference fit, the inner chamber of armature be equipped with the first sealed face of first case seal fit.

4. The electric pump for a diesel engine according to claim 3, characterized in that: first sealing rings are respectively arranged between the lower end of the guide pipe and the shell and between the upper end of the guide pipe and the check valve component.

5. The electric pump for a diesel engine according to claim 4, characterized in that: the shell includes main part and downwardly extending's oil feed portion, oil feed portion with be formed with the mount table between the main part, be equipped with the second sealing washer on the mount table.

6. The electric pump for a diesel engine according to claim 1, characterized in that: and a third sealing ring is arranged on the periphery of the plug and is in sealing fit with the assembling surface.

7. The electric pump for a diesel engine according to claim 1, characterized in that: the check valve assembly comprises a valve body, a second valve core arranged in the valve body, a second limiting plate arranged in the valve body and a third elastic piece arranged between the second valve core and the second limiting plate, wherein a plurality of second through holes are formed in the second limiting plate, and a second sealing surface in sealing fit with the second valve core is arranged in the valve body.

8. The electric pump for a diesel engine according to claim 1, characterized in that: the coil component comprises a coil framework, a coil wound on the coil framework, magnetic rings arranged in the coil framework and magnetic plates respectively arranged at the upper end and the lower end of the coil, and an input terminal component connected to the coil is arranged on the magnetic plate at the upper end.

9. The electric pump for a diesel engine according to claim 8, characterized in that: an elastic gasket is arranged between the magnetic conduction plate at the lower end and the shell.

10. The electric pump for a diesel engine according to claim 8, characterized in that: the plug comprises a plug body, a PCB (printed circuit board) arranged in the plug body, and a first inserting piece assembly and a second inserting piece assembly fixed on the PCB, wherein the first inserting piece assembly is connected with a power supply, and the second inserting piece assembly is connected with the input end assembly.

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