An oil injection pump

Abstract

The present application provides a kind of fuel injection pump, including nozzle connecting pipe, connecting cavity, solenoid valve, pump base, pump base is connected nozzle connecting pipe through connecting cavity above, solenoid valve is arranged in one side of connecting cavity, the center of pump base is equipped with cavity, vertical direction is sleeved with rotating shaft in cavity, pump base is further equipped with liquid inlet pipeline and liquid outlet pipeline, rotating shaft top is equipped with outer gear, the inner wall of cavity is equipped with a circle of internal gear, outer gear outside is always engaged with internal gear inside and rotates along internal gear, outer gear and internal gear disengagement is equipped with a crescent plate, the crescent plate is fixed in cavity, one end of the crescent plate is negative pressure cavity, the other end is high pressure chamber, the oil in containing chamber is controlled by adjusting pressure adjusting mechanism, to control the pressure of the chamber and pipeline of entire fuel injection pump, to ensure the pressure at nozzle connecting pipe, so that the oil sprayed presents spray;Using internal gear pump, so that the overall structure is compact, gear speed is high, noise is low.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of gear pump, more particularly, relates to a fuel injection pump. BACKGROUND

[0002] Gear pump is a kind of rotary pump which transports liquid or pressurizes liquid by the change and movement of working volume between pump cylinder and meshing gears. Two gears, pump body and front and back covers form two closed spaces, when gears rotate, the volume of space on the gear disengaging side changes from small to large, forming a vacuum, liquid is sucked in, the volume of space on the gear engaging side changes from large to small, and liquid is squeezed into the pipeline.

[0003] Internal meshing gear pump has the advantages of simple structure, stable flow, no pulsation, and power shaft can be coaxial with the turbine shaft of the retarder. In the application of fuel injection pump, the currently used external meshing gear pump has low speed, high noise, and large overall structure, resulting in low overall fuel injection efficiency. SUMMARY

[0004] Therefore, in order to solve the above problems, the present application provides a fuel injection pump which adopts internal meshing gear pump, so that the overall structure is compact, and the gear speed is high and the noise is low.

[0005] The utility model provides an oil injection pump, including nozzle connecting pipe 1, connecting chamber 2, solenoid valve 3, pump base 4, nozzle connecting pipe 1 is connected through connecting chamber 2 above pump base 4, solenoid valve 3 is arranged in one side of connecting chamber 2, the center of pump base 4 is equipped with cavity 45, the vertical direction of cavity 45 is sleeved with the shaft 41, pump base 4 is also equipped with liquid inlet pipeline 52 and liquid outlet pipeline 7, it is characterized by: the top of shaft 41 is equipped with external gear 42, the inner wall of cavity 45 is equipped with a circle of internal gear 43, external gear 42 outside always engages with the inside of internal gear 43 and rotates along internal gear 43, the place where external gear 42 and internal gear 43 disengage is equipped with a crescent plate 44, the crescent plate 44 is fixed in cavity 45, and one end of the crescent plate 44 is a negative pressure chamber, and the other end is a high pressure chamber, the output end of the high pressure chamber is communicated with the shunt channel 48, oil flows into the negative pressure chamber of the crescent plate 44 from the liquid inlet pipeline 52, external gear 42 and internal gear 43 rotate and engage constantly, and oil is pushed into the high pressure chamber of the crescent plate 44, then flows into the shunt channel 48 and flows out in two sections, one section goes up into the solenoid valve 3, and the other section goes down into the containing chamber 65 of the second chamber 6, the second chamber 6 is equipped with a pressure regulating mechanism 61, when the pressure in the containing chamber 65 is large, the pressure regulating mechanism 61 is pushed outwards, one side of the containing chamber 65 forms a branch, the branch is connected with the liquid outlet pipeline 7, and the liquid outlet of the liquid outlet pipeline 7 is connected with the oil tank at the liquid inlet pipeline 52, so that the liquid inlet pipeline 52 and the liquid outlet pipeline 7 form a loop, the oil in the containing chamber 65 is controlled by adjusting the pressure regulating mechanism 61, so as to control the pressure of the chamber and the pipeline of the whole oil pump, to ensure the pressure at the nozzle connecting pipe 1, so that the sprayed oil presents a spray state.

[0006] Further, the tooth tip of the external gear 42 is a circular arc surface, so that the pump tip gap is reduced, the sliding sealing area is increased, the liquid return amount is small, and the internal leakage is easily blocked, so that the gear pump efficiency is super high.

[0007] Further, the liquid inlet pipeline 52 and the liquid outlet pipeline 7 are externally provided with marks for preventing mistakes.

[0008] Further, the pump base 4 is provided with a connecting portion 451 away from the cavity 45, a sealing ring is sleeved on the inner wall of the connecting portion 451, so that the inside of the cavity 45 is in a vacuum sealing state, the connecting portion 451 is used for connecting a motor, and the rotation of the shaft 41 is driven by the motor.

[0009] Further, the connecting portion 451 is externally provided with a reinforcing rib 452, and the connecting portion 451 and the reinforcing rib 452 are integrally formed.

[0010] Further, the cavity 45 is connected with the liquid inlet pipeline 52 with the first chamber 5, the first chamber 5 is sleeved with the filter screen structure 51, the first chamber 5 and the filter screen structure 51 form the passageway, the input end of the passageway is connected with the output end of the liquid inlet pipeline 52, and the output end of the passageway is communicated with the input end of the cavity 45.

[0011] Further, the connecting cavity 2 is provided with the first oil injection pipe 21 and the second oil injection pipe 25, the bottom of the first oil injection pipe 21 is connected with the high-pressure cavity, the top is connected with the liquid inlet end of the first buffer pipe 22, the bottom end of the second oil injection pipe 25 is connected with the liquid inlet end of the second buffer pipe 24, and the top is connected with the nozzle connecting pipe 1, one end of the electromagnetic valve 3 is provided with the rubber plug 32, when the pressure in the pump body is small, the electromagnetic valve is in the closed state, the rubber plug 32 blocks the liquid outlet ends of the first buffer pipe 22 and the second buffer pipe 24, and the oil liquid is buffered in the first buffer pipe 22 after entering the first oil injection pipe 21, when the pressure reaches, the electromagnetic valve is opened, the rubber plug 32 is separated from the first buffer pipe 22 and the second buffer pipe 24, so that the oil liquid flows into the second buffer pipe 24 from the first buffer pipe, and finally flows out from the nozzle connecting pipe 1.

[0012] Further, the connecting cavity 2 is provided with the transfer chamber 23, one end of the transfer chamber 23 is the first buffer pipe 22 and the second buffer pipe 24, the other end is connected with the electromagnetic valve 3, the electromagnetic valve 3 is provided with the second spring 31, one end of the second spring 31 is connected with the rubber plug 32, when the pressure reaches, the electromagnetic valve 3 is opened to generate a magnetic force, so that the second spring 31 is inwards, the rubber plug 32 is separated from the first buffer pipe 22 and the second buffer pipe 24, the oil liquid enters the transfer chamber 23 from the first buffer pipe 22, and then enters the second buffer pipe 24, when the electromagnetic valve 3 is closed, the magnetic force disappears, the second spring 31 loses the action force and restores to the original state, and the rubber plug 32 is pushed to block the first buffer pipe 22 and the second buffer pipe 24.

[0013] The beneficial effects of the present application: the present application provides a fuel injection pump, comprising nozzle connecting pipe 1, connecting cavity 2, solenoid valve 3, pump base 4, the pump base 4 is connected to the nozzle connecting pipe 1 through the connecting cavity 2, the solenoid valve 3 is arranged on one side of the connecting cavity 2, the center of the pump base 4 is provided with a cavity 45, the vertical direction of the cavity 45 is sleeved with a rotating shaft 41, the pump base 4 is also provided with a liquid inlet pipe 52 and a liquid outlet pipe 7, the top of the rotating shaft 41 is provided with an external gear 42, the inner wall of the cavity 45 is provided with a ring of internal gear 43, the outer side of the external gear 42 is always engaged with the inner side of the internal gear 43 and rotates along the internal gear 43, the external gear 42 is provided with a crescent plate 44 at the disengagement position of the internal gear 43, the crescent plate 44 is fixed in the cavity 45, one end of the crescent plate 44 is a negative pressure cavity, and the other end is a high pressure cavity, the output end of the high pressure cavity is communicated with a shunt channel 48, the oil flows into the negative pressure cavity of the crescent plate 44 from the liquid inlet pipe 52, the external gear 42 and the internal gear 43 rotate and engage continuously, and the oil is pushed into the high pressure cavity of the crescent plate 44, and then flows into the shunt channel 48 and flows out in two sections, one section is communicated into the solenoid valve 3, and the other section is communicated into the containing cavity 65 of the second cavity 6, the second cavity 6 is provided with a pressure regulating mechanism 61, the pressure regulating mechanism 61 is pushed outwards when the pressure in the containing cavity 65 is large, one side of the containing cavity 65 forms a branch, the branch is connected with the liquid outlet pipe 7, the liquid outlet of the liquid outlet pipe 7 is connected with the oil tank at the liquid inlet pipe 52, so that the liquid inlet pipe 52 and the liquid outlet pipe 7 form a loop; the oil in the containing cavity 65 is controlled by adjusting the pressure regulating mechanism 61, so that the pressure of the chamber and the pipeline of the whole fuel pump is controlled, the pressure at the nozzle connecting pipe 1 is ensured, and the sprayed oil presents a spray state; the internal engagement gear pump is adopted, so that the overall structure is compact, the gear rotating speed is high, and the noise is low. BRIEF DESCRIPTION OF DRAWINGS

[0014] Figure 1 It is the overall structure diagram of the fuel injection pump of the present application.

[0015] Figure 2 It is the pump base sectional view of the fuel injection pump of the present application.

[0016] Figure 3 It is the pump base structure diagram of the fuel injection pump of the present application.

[0017] Figure 4 It is the pump base structure diagram of the fuel injection pump of the present application.

[0018] Figure 5 It is the overall sectional view of the fuel injection pump of the present application.

[0019] Figure 6 It is the connection schematic diagram of the first cavity and the second cavity of the fuel injection pump of the present application.

[0020] Figure 7The connection profile view of the first chamber and the second chamber of the oil injection pump of the present application.

[0021] Figure 8 The connection chamber structure view of the oil injection pump of the present application.

[0022] Figure 9 The profile view of the electromagnetic valve chamber of the oil injection pump of the present application.

[0023] Figure 10 The connection profile view of the electromagnetic valve chamber of the oil injection pump of the present application.

[0024] Main element symbol explanation

[0025] Nozzle connecting pipe 1, connecting chamber 2, first oil injection pipe 21, first buffer pipe 22, transfer chamber 23, second buffer pipe 24, second oil injection pipe 25, electromagnetic valve 3, second spring 31, rubber plug 32, pump base 4, rotating shaft 41, outer gear 42, inner gear 43, crescent plate 44, cavity 45, connecting part 451, reinforcing rib 452, liquid inlet passage 46, shunt passage 48, first chamber 5, filter screen structure 51, liquid inlet pipe 52, back cover 53, second chamber 6, pressure regulating mechanism 61, containing chamber 65, liquid outlet pipe 7.

[0026] The following specific embodiments will further illustrate the present application in connection with the above-mentioned drawings. Specific embodiments

[0027] Example 1:

[0028] A fuel injection pump includes a nozzle connecting pipe 1, a connecting cavity 2, a solenoid valve 3, and a pump base 4. The nozzle connecting pipe 1 is connected to the top of the pump base 4 through the connecting cavity 2. The solenoid valve 3 is disposed on one side of the connecting cavity 2. A cavity 45 is provided at the center of the pump base 4. A rotating shaft 41 is sleeved vertically inside the cavity 45. The pump base 4 also has an inlet pipe 52 and an outlet pipe 7. The pump base 4 is characterized in that: an external gear 42 is provided at the top of the rotating shaft 41; an internal gear 43 is provided on the inner wall of the cavity 45; the outer side of the external gear 42 always meshes with the inner side of the internal gear 43 and rotates along the internal gear 43; a crescent plate 44 is provided at the point where the external gear 42 disengages from the internal gear 43; the crescent plate 44 is fixed inside the cavity 45; one end of the crescent plate 44 is a negative pressure chamber, and the other end is a high pressure chamber; the output end of the high pressure chamber is connected to a diversion channel 48, and fuel flows from the inlet pipe... The oil flows into the negative pressure chamber of the crescent plate 44 through channel 52. The external gear 42 and the internal gear 43 continuously rotate and mesh, pushing the oil into the high pressure chamber of the crescent plate 44. Then, it flows into the diversion channel 48 and flows out in two sections. One section flows upward into the solenoid valve 3, and the other section flows downward into the receiving chamber 65 of the second chamber 6. The second chamber 6 is equipped with a pressure regulating mechanism 61. When the pressure in the receiving chamber 65 is high, the pressure regulating mechanism 61 is pushed outward. A branch is formed on one side of the receiving chamber 65. The branch is connected to the outlet pipe 7. The outlet of the outlet pipe 7 is connected to the oil tank at the inlet pipe 52, so that the inlet pipe 52 and the outlet pipe 7 form a loop. By adjusting the pressure regulating mechanism 61, the oil in the receiving chamber 65 is controlled, thereby controlling the pressure of the entire oil pump chamber and pipeline to ensure the pressure at the nozzle connection pipe 1, so that the sprayed oil is in a spray form.

[0029] The tip of the external gear 42 is an arc surface, which reduces the gap between the pump tips, thereby increasing the area of ​​the sliding seal, reducing the liquid backflow, and making it easier to block internal leakage, thus making the gear pump extremely efficient.

[0030] The inlet pipe 52 and outlet pipe 7 are marked on the outside to prevent mistaken identification.

[0031] The pump base 4 is provided with a connecting part 451 at the end away from the cavity 45. A sealing ring is fitted on the inner wall of the connecting part 451 so that the cavity 45 is in a vacuum-sealed state. The connecting part 451 is used to connect a motor, and the motor drives the rotating shaft 41 to rotate.

[0032] The connecting part 451 is provided with a reinforcing rib 452 extending from its periphery, and the connecting part 451 and the reinforcing rib 452 are integrally formed.

[0033] The first chamber 5 is connected between the cavity 45 and the liquid inlet pipeline 52, the filter screen structure 51 is sleeved in the first chamber 5, a clamping channel is formed between the first chamber 5 and the filter screen structure 51, the input end of the clamping channel is connected with the output end of the liquid inlet pipeline 52, and the output end of the clamping channel is communicated with the input end of the cavity 45.

[0034] The first oil injection pipe 21 and the second oil injection pipe 25 are arranged in the connecting cavity 2, the bottom of the first oil injection pipe 21 is connected with the high-pressure cavity, the top of the first oil injection pipe 21 is connected with the liquid inlet end of the first buffer pipe 22, the bottom of the second oil injection pipe 25 is connected with the liquid inlet end of the second buffer pipe 24, and the top of the second oil injection pipe 25 is connected with the nozzle connecting pipe 1, one end of the electromagnetic valve 3 is provided with a rubber plug 32, when the pressure in the pump body is small, the electromagnetic valve is in a closed state, the rubber plug 32 blocks the liquid outlet ends of the first buffer pipe 22 and the second buffer pipe 24, and the oil liquid is buffered in the first buffer pipe 22 after entering the first oil injection pipe 21, when the pressure reaches, the electromagnetic valve is opened, the rubber plug 32 is separated from the first buffer pipe 22 and the second buffer pipe 24, so that the oil liquid flows into the second oil injection pipe 25 from the first buffer pipe and is finally sprayed out from the nozzle connecting pipe 1.

[0035] The connecting cavity 2 is provided with a transfer chamber 23, one end of the transfer chamber 23 is connected with the first buffer pipe 22 and the second buffer pipe 24, the other end of the transfer chamber 23 is connected with the electromagnetic valve 3, the electromagnetic valve 3 is provided with a second spring 31, one end of the second spring 31 is connected with the rubber plug 32, when the pressure reaches, the electromagnetic valve 3 is opened to generate a magnetic force, the second spring 31 is inwardly attracted, the rubber plug 32 is pulled away from the first buffer pipe 22 and the second buffer pipe 24, the oil liquid enters the transfer chamber 23 from the first buffer pipe 22 and then enters the second buffer pipe 24, when the electromagnetic valve 3 is closed, the magnetic force disappears, the second spring 31 loses the acting force and restores to the original state, and the rubber plug 32 is pushed to block the first buffer pipe 22 and the second buffer pipe 24.

[0036] The beneficial effects of the present application: the present application provides a fuel injection pump, comprising nozzle connecting pipe 1, connecting cavity 2, solenoid valve 3, pump base 4, the pump base 4 is connected to the nozzle connecting pipe 1 through the connecting cavity 2, the solenoid valve 3 is arranged on one side of the connecting cavity 2, the center of the pump base 4 is provided with a cavity 45, the vertical direction of the cavity 45 is sleeved with a rotating shaft 41, the pump base 4 is also provided with a liquid inlet pipe 52 and a liquid outlet pipe 7, the top of the rotating shaft 41 is provided with an external gear 42, the inner wall of the cavity 45 is provided with a ring of internal gear 43, the outer side of the external gear 42 is always engaged with the inner side of the internal gear 43 and rotates along the internal gear 43, the external gear 42 is provided with a crescent plate 44 at the disengagement position of the internal gear 43, the crescent plate 44 is fixed in the cavity 45, one end of the crescent plate 44 is a negative pressure cavity, and the other end is a high pressure cavity, the output end of the high pressure cavity is communicated with a shunt channel 48, the oil liquid flows into the negative pressure cavity of the crescent plate 44 from the liquid inlet pipe 52, the external gear 42 and the internal gear 43 rotate and engage continuously, and the oil liquid is pushed into the high pressure cavity of the crescent plate 44, and then flows into the shunt channel 48 and flows out in two sections, one section is communicated into the solenoid valve 3, and the other section is communicated into the containing cavity 65 of the second cavity 6, the second cavity 6 is provided with a pressure regulating mechanism 61, the pressure regulating mechanism 61 is pushed outwards when the pressure in the containing cavity 65 is large, one side of the containing cavity 65 forms a branch, the branch is connected with the liquid outlet pipe 7, the liquid outlet of the liquid outlet pipe 7 is connected with the oil tank at the liquid inlet pipe 52, so that the liquid inlet pipe 52 and the liquid outlet pipe 7 form a loop; the oil liquid in the containing cavity 65 is controlled by adjusting the pressure regulating mechanism 61, so as to control the pressure of the cavity and the pipeline of the whole fuel pump, so as to ensure the pressure at the nozzle connecting pipe 1, so that the sprayed oil presents a spray state; the internal engagement gear pump is adopted, so that the overall structure is compact, and the gear rotating speed is high and the noise is low.

[0037] The above-mentioned embodiments only express several embodiments of the present application, and the description is more specific and detailed, but it cannot be understood as the limitation of the patent scope of the present application. It should be pointed out that for ordinary skilled persons in the art, without departing from the concept of the present application, a number of modifications and improvements can be made, which belong to the protection scope of the present application. Therefore, the protection scope of the present application patent should be subject to the appended claims.

Claims

1. An oil injection pump, comprising a nozzle connecting pipe (1), a connecting cavity (2), an electromagnetic valve (3), and a pump base (4), wherein the pump base (4) is connected to the nozzle connecting pipe (1) through the connecting cavity (2), the electromagnetic valve (3) is arranged on one side of the connecting cavity (2), the center of the pump base (4) is provided with a cavity (45), a rotating shaft (41) is sleeved in the cavity (45) in the vertical direction, and the pump base (4) is further provided with an inlet pipe (52) and an outlet pipe (7), characterized in that: The outer gear (42) is provided at the top of the rotating shaft (41), the inner wall of the cavity (45) is provided with a ring of inner gear (43), the outer gear (42) is always engaged with the inner side of the inner gear (43) and rotates along the inner gear (43), the outer gear (42) is provided with a crescent plate (44) at the disengagement position of the outer gear (42) and the inner gear (43), the crescent plate (44) is fixed in the cavity (45), one end of the crescent plate (44) is a negative pressure cavity, and the other end is a high pressure cavity, the output end of the high pressure cavity is communicated with a shunt channel (48), the oil flows into the negative pressure cavity of the crescent plate (44) from the liquid inlet pipeline (52), the outer gear (42) and the inner gear (43) are continuously rotated and engaged, the oil is pushed into the high pressure cavity of the crescent plate (44), and then flows into the shunt channel (48) and flows out in two sections, one of which is communicated into the electromagnetic valve (3), and the other of which is communicated into the containing cavity (65) of the second cavity (6), the pressure adjusting mechanism (61) is arranged in the second cavity (6), the pressure adjusting mechanism (61) is pushed outwards when the pressure in the containing cavity (65) is large, one side of the containing cavity (65) forms a branch, the liquid outlet pipeline (7) is connected to the branch, the liquid outlet of the liquid outlet pipeline (7) is connected to the oil tank at the liquid inlet pipeline (52), so that the liquid inlet pipeline (52) and the liquid outlet pipeline (7) form a loop; the pressure of the oil in the containing cavity (65) is controlled by adjusting the pressure adjusting mechanism (61), so that the pressure of the chamber and the pipeline of the whole oil pump is controlled, the pressure at the nozzle connecting pipe (1) is ensured, the sprayed oil is in the form of spray, the first oil injection pipe (21) and the second oil injection pipe (25) are arranged in the connecting cavity (2), the bottom of the first oil injection pipe (21) is connected to the high pressure cavity, the top is connected to the liquid inlet end of the first buffer pipe (22), the bottom end of the second oil injection pipe (25) is connected to the liquid outlet end of the second buffer pipe (24), and the top is connected to the nozzle connecting pipe (1), one end of the electromagnetic valve (3) is provided with a rubber plug (32), the electromagnetic valve is in a closed state when the pressure in the pump body is small, the rubber plug (32) blocks the first buffer pipe (22) and the second buffer pipe (24), the oil enters the first buffer pipe (22) after entering the first oil injection pipe (21), the electromagnetic valve is opened when the pressure reaches, the rubber plug (32) is separated from the first buffer pipe (22) and the second buffer pipe (24), so that the oil flows into the second buffer pipe (24) from the first buffer pipe (22), then flows into the second oil injection pipe (25), and finally is sprayed from the nozzle connecting pipe (1). ​ 2. The fuel injection pump according to claim 1, characterized in that: The tooth tip of the outer gear (42) is a circular arc surface.

3. The fuel injection pump according to claim 1, characterized in that: The liquid inlet pipeline (52) and the liquid outlet pipeline (7) are provided with marks outside.

4. The fuel injection pump of claim 1, characterized in that: The pump base (4) is provided with a connecting portion (451) away from the cavity (45), a sealing ring is sleeved on the inner wall of the connecting portion (451), so that the inside of the cavity (45) is in a vacuum sealed state, the connecting portion (451) is used for connecting a motor, and the rotating shaft (41) is driven to rotate by the motor.

5. The fuel injection pump of claim 4, characterized in that: The connecting part (451) is integrally formed with the reinforcing rib (452).

6. The fuel injection pump of claim 1, wherein: The first chamber (5) is connected between the cavity (45) and the liquid inlet pipeline (52), the filter screen structure (51) is sleeved in the first chamber (5), a clamping channel is formed between the first chamber (5) and the filter screen structure (51), the input end of the clamping channel is connected with the output end of the liquid inlet pipeline (52), and the output end of the clamping channel is communicated with the input end of the cavity (45).

7. The fuel injection pump of claim 1, wherein: The connecting cavity (2) is provided with a transfer chamber (23), one end of the transfer chamber (23) is a first buffer pipe (22) and a second buffer pipe (24), the other end is connected with the electromagnetic valve (3), the second spring (31) is arranged in the electromagnetic valve (3), one end of the second spring (31) is connected with the rubber plug (32), when the pressure reaches, the electromagnetic valve (3) is opened to generate magnetic force, the second spring (31) is inwards absorbed, the rubber plug (32) is pulled to separate from the first buffer pipe (22) and the second buffer pipe (24), the oil liquid enters the transfer chamber (23) from the first buffer pipe (22), and then enters the second buffer pipe (24), when the electromagnetic valve (3) is closed, the magnetic force disappears, the second spring (31) loses the action force and restores to the original state, and the rubber plug (32) is pushed to block the first buffer pipe (22) and the second buffer pipe (24).

Images