Single-cylinder pump with oil return function

Abstract

The utility model relates to the technical field of fuel injection pumps, in particular to a single-cylinder pump with an oil return function, which comprises a pump body and a tappet body, the tappet body is arranged below the pump body, a flange structure is integrally arranged on the outer side wall of the pump body, and the tappet body is connected with the pump body. An oil inlet hole and an oil discharge hole are formed in the pump body, an oil inlet pipe is arranged at the position of the oil inlet hole, an oil return pipe is arranged at the position of the oil discharge hole, a first channel and a second channel are arranged in the oil return pipe, a stop pin is arranged on the oil return pipe at the position of the second channel, and a steel ball is arranged between the stop pin and the first channel; by arranging the flange structure integrated with the pump body, the problem that the rigidity of a split pump body is small is solved, and the use stability of the oil pump is enhanced; by arranging the oil inlet pipe and the oil return pipe, the impact wave influence in the oil pipe during single pipe design is avoided, and the working stability of the fuel injection pump is enhanced.

Description

Technical Field

[0001] The utility model relates to the technical field of fuel injection pumps, and more specifically, to a single-cylinder pump with oil return. Background Art

[0002] In the related art, in order to facilitate installation and debugging, most single-cylinder fuel injection pumps adopt a split design. The sealing flange plate is separated from the fuel injection pump, and the stiffness of the pump body is relatively small, which is prone to deformation and cause the fuel injection pump to get stuck. In addition, there is only one oil pipe on the fuel injection pump to achieve oil inlet and outlet. When the fuel injection pump reaches the oil discharge position, the oil with a certain pressure sprays out from the oil pipe, forming a shock wave in the inlet oil pipe, affecting the stability of the fuel injection pump's oil inlet, and thus affecting the working stability of the fuel injection pump.

[0003] Therefore, it is necessary to provide a single-cylinder pump with oil return. Summary of the Utility Model

[0004] The utility model provides a single-cylinder pump with oil return to solve the above technical problems.

[0005] To achieve the above object, an embodiment of the utility model provides a single-cylinder pump with oil return, including: a pump body and a tappet body. The tappet body is arranged below the pump body. A flange structure is integrally arranged on the outer side wall of the pump body. An oil inlet hole and an oil discharge hole are opened on the pump body. An oil inlet pipe is arranged at the position of the oil inlet hole, and an oil return pipe is arranged at the position of the oil discharge hole. A first channel and a second channel are arranged in the oil return pipe. The diameter of the first channel is smaller than that of the second channel. A stop pin is arranged on the oil return pipe at the position of the second channel. A steel ball is arranged between the stop pin and the first channel. The radius of the steel ball is larger than that of the first channel.

[0006] Further, a spring lower seat is arranged in the pump body above the tappet body. A plunger body is arranged on the top surface of the spring lower seat. A plunger spring is sleeved on the plunger body.

[0007] Further, a tight seat is arranged at the connection position between the plunger body and the top surface of the pump body. A valve core is arranged between the tight seat and the top of the plunger body. An oil outlet valve spring is sleeved on the top of the valve core. An oil outlet valve seat is arranged at the bottom of the oil outlet valve spring. A sealing gasket is arranged at the bottom of the oil outlet valve seat. A volume reduction block is arranged between the oil outlet valve spring and the position near the top of the tight seat.

[0008] Further, a middle hole is opened at the center position of the valve core. A large oil hole is opened on the valve core at the lower position of the middle hole, and a small oil hole is opened on the valve core at the upper position of the middle hole.

[0009] Further, a support body is provided at the bottom of the pump body. The support body is fixed to the pump body through a pin body. A notch is provided on the support body. Two end faces are formed on both sides of the notch. Pin holes are provided on the support body near the positions of the end faces. The included angle between the connection line of one of the end faces and one of the pin holes is a, and a is less than or equal to 28°. The included angle between the connection line of the other end face and the other pin hole is b, and b is less than or equal to 48°.

[0010] Further, an oil quantity control sleeve is sleeved on the surface of the plunger body. The oil quantity control sleeve is arranged between the pump body and the support body. An opening groove is provided on the oil quantity control sleeve. A part of the plunger body extends into the opening groove.

[0011] Further, a limiting groove is provided on the inner wall of the oil quantity control sleeve.

[0012] Further, a cushion block is provided at the bottom of the spring lower seat. A receiving hole is provided on the tappet body. A part of the spring lower seat, the spring lower seat and the cushion block are all arranged in the receiving hole.

[0013] Further, a roller pin is provided on the tappet body. A notch is provided on the tappet body. The notch is arranged on one side of the roller pin.

[0014] Further, a ball head is installed on the oil quantity control sleeve.

[0015] Compared with the prior art, the beneficial effects of the present utility model are as follows:

[0016] By providing a flange structure integrated with the pump body, the problem of relatively small stiffness of the split pump body is solved, the problem of the oil pump being stuck due to easy deformation is avoided, and the use stability of the oil pump is enhanced;

[0017] By providing an inlet pipe and a return pipe, the influence of shock waves in the oil pipe during single-pipe design is avoided, and the working stability of the fuel injection pump is enhanced;

[0018] By providing a steel ball in the return pipe, the oil discharged from the position of the return pipe is prevented from returning into the pump body;

[0019] By providing a support body, the working stability of the plunger spring is improved, and further the operation stability degree of the pump body is improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The following further describes the present utility model in conjunction with the drawings and embodiments.

[0021] Figure 1 It is a sectional view of the optimal embodiment of a single-cylinder pump with oil return of the present utility model;

[0022] Figure 2Isometric view of the optimal embodiment of the pump body of the present utility model;

[0023] Figure 3 Cross-sectional view of the optimal embodiment of the fuel outlet valve seat of the present utility model;

[0024] Figure 4 Structural schematic diagram of the optimal embodiment of the tappet body of the present utility model;

[0025] Figure 5 Cross-sectional view of the optimal embodiment of the tappet body of the present utility model;

[0026] Figure 6 Isometric view of the optimal embodiment of the fuel quantity control sleeve of the present utility model;

[0027] Figure 7 Isometric view of the optimal embodiment of the support body of the present utility model;

[0028] Figure 8 Structural schematic diagram of the optimal embodiment of the notch of the present utility model;

[0029] Figure 9 Structural schematic diagram of the optimal embodiment of the return oil pipe of the present utility model.

[0030] Among them, 1, tight seat; 2, volume reduction block; 3, fuel outlet valve spring; 4, fuel outlet valve seat; 5, sealing gasket; 6, inlet pipe; 7, pump body; 8, support body; 9, fuel quantity control sleeve; 10, plunger spring; 11, tappet body; 12, spacer; 13, spring lower seat; 14, flange structure; 15, pin body; 16, plunger body; 17, return oil pipe; 18, retaining pin; 19, steel ball; 20, valve core; 21, small oil hole; 22, large oil hole; 23, middle hole; 24, notch; 25, roller pin; 26, ball head; 27, open slot; 28, notch; 29, pin hole. Specific embodiments

[0031] Now, the present utility model will be further described in detail with reference to the accompanying drawings. These drawings are all simplified schematic diagrams, only illustrating the basic structure of the present utility model in a schematic manner, so they only show the components related to the present utility model.

[0032] Please refer to Figure 1 , Figure 1 is the cross-sectional view of the optimal embodiment of a single-cylinder pump with oil return of the present utility model. As Figure 1 shown, at least one embodiment provides a single-cylinder pump with oil return, including: a pump body 7 and a tappet body 11. The tappet body 11 is arranged below the pump body 7. A flange structure 14 is integrally arranged on the outer side wall of the pump body 7. An oil inlet hole and an oil discharge hole are formed on the pump body 7. An inlet pipe 6 is arranged at the position of the oil inlet hole, and a return oil pipe 17 is arranged at the position of the oil discharge hole. Please refer toFigure 9 , Figure 9 is a schematic structural view of the optimal embodiment of the oil return pipe of the present utility model. As Figure 9 shown, a first channel and a second channel are provided in the oil return pipe 17. The diameter of the first channel is smaller than that of the second channel. A retaining pin 18 is provided on the oil return pipe 17 at the position of the second channel. A steel ball 19 is provided between the retaining pin 18 and the first channel. The radius of the steel ball 19 is greater than the radius of the first channel.

[0033] Please refer to Figure 1 and in combination with Figures 2 to 3 , Figure 2 is a perspective view of the optimal embodiment of the pump body of the present utility model; Figure 3 is a sectional view of the optimal embodiment of the oil outlet valve seat of the present utility model. As Figures 1 to 3 shown, a spring lower seat 13 is provided in the pump body 7 above the tappet body 11. A plunger body 16 is provided on the top surface of the spring lower seat 13. A plunger spring 10 is sleeved on the plunger body 16. A tight seat 1 is provided at the connection position between the plunger body 16 and the top surface of the pump body 7. A volume reduction block 2 is provided between the oil outlet valve spring 3 and the position near the top of the tight seat 1. A valve core 20 is provided between the tight seat 1 and the top of the plunger body 16. The top of the valve core 20 is sleeved with an oil outlet valve spring 3. The bottom of the oil outlet valve spring 3 is provided with an oil outlet valve seat 4. The bottom of the oil outlet valve seat 4 is provided with a sealing gasket 5. The plunger body 16 is installed in the middle hole of the pump body 7. An oil inlet pipe 6 and an oil return pipe 17 are provided on the upper side surface of the upper part of the pump body 7. An oil outlet valve seat 4 and a tight seat 1 are provided in the middle hole of the upper part of the pump body 7. A sealing gasket 5 is provided on the joint surface between the oil outlet valve seat 4 and the pump body. A valve core 20 is provided in the oil outlet valve seat 4. Both the oil outlet valve seat 4 and the valve core 20 are placed in the middle hole of the tight seat 1. An oil outlet valve spring 3 is provided above the valve core 20. A volume reduction block 2 is provided between the oil outlet valve spring 3 and the upper part of the middle hole of the tight seat 1. A middle hole 23 is provided at the central position of the valve core 20. A large oil hole 22 is provided on the valve core 20 at a position close to the lower part of the middle hole 23. A small oil hole 21 is provided on the valve core 20 at a position close to the upper part of the middle hole 23.

[0034] Please continue to refer to Figure 1 and in combination with Figure 7 and Figure 8 , Figure 7 is a perspective view of the optimal embodiment of the support body of the present utility model; Figure 8 is a schematic structural view of the optimal embodiment of the notch of the present utility model. As Figure 1 , Figure 7 and Figure 8As shown, a support body 8 is provided at the bottom of the pump body 7. The support body 8 is fixed to the pump body 7 through a pin body 15. A notch 28 is provided on the support body 8. Two end faces are formed on both sides of the notch 28. A pin hole 29 is provided on the support body 8 near the end face position. The included angle between the connection line of one end face and one of the pin holes 29 is a, and a is less than or equal to 28°. The included angle between the connection line of the other end face and the other pin hole 29 is b, and b is less than or equal to 48°.

[0035] Please refer to Figure 6 , Figure 6 which is a perspective view of the optimal embodiment of the fuel quantity control sleeve of the present invention. As Figure 6 shown, an oil quantity control sleeve 9 is sleeved on the surface of the plunger body 16. A ball head 26 is installed on the oil quantity control sleeve 9. The oil quantity control sleeve 9 is arranged between the pump body 7 and the support body 8. An opening groove 27 is provided on the oil quantity control sleeve 9. A part of the plunger body 16 extends into the opening groove 27. A limiting groove is provided on the inner wall of the oil quantity control sleeve 9. There is a support body 8 at the lower part of the pump body 7. The support body 8 is fixed to the lower part of the pump body 7 through a pin 15. The oil quantity control sleeve 9 is arranged between the pump body 7 and the support body 8, and the axial movement and the rotation angle in the circumferential direction of the oil quantity control sleeve 9 are restricted by the support body 8. An opening groove 27 is provided on the oil quantity control sleeve 9. The lower part of the plunger body 16 is embedded in the opening groove 27. When the oil quantity control sleeve 9 rotates, the plunger body 16 can be driven to rotate synchronously with the oil quantity control sleeve 9 through the opening groove 27. When the fuel injection pump is moved or transported, the plunger body 16 is prevented from being disengaged from the pump body 7. A spring lower seat 13 is provided at the lower part of the plunger body 16. A cushion block 12 is provided at the bottom of the spring lower seat 13. A receiving hole is provided on the tappet body 11. A part of the spring lower seat 13, the spring lower seat 13, and the cushion block 12 are all arranged in the receiving hole. A plunger spring 10 is provided between the spring lower seat 13 and the support body 8. A part of the plunger spring 10, the spring lower seat 13, and the adjusting cushion block 12 are all in the middle hole of the tappet body 11.

[0036] Please continue to refer to Figure 1 and in combination with Figure 4 and Figure 5 , Figure 4 which is a structural schematic diagram of the optimal embodiment of the tappet body of the present invention; Figure 5 which is a sectional view of the optimal embodiment of the tappet body of the present invention. As Figure 1 , Figure 4 and Figure 5 shown, a roller pin 25 is provided on the tappet body 11. A notch 24 is provided on the tappet body 11. The notch 24 is arranged on one side of the roller pin 25.

[0037] Specifically, when the tappet body 11 moves upward, it drives the adjustment pad 12, the spring lower seat 13 and the plunger body 16 to move upward. When the plunger body 16 moves upward for a certain distance, the upper space of the plunger body 16 becomes smaller, and the fuel inside is compressed to form a certain pressure. When the force of the pressure acting on the valve core 20 is greater than the elastic force of the oil outlet valve spring 3, the valve core 20 moves upward, and the small oil hole 21 first exposes the valve seat 4. A part of the pressure oil flows out from the small oil hole 21 through the middle hole 23, and then sprays out through the volume reduction block 2 and the tight seat 1. As the plunger body 16 moves, the fuel pressure continues to increase, and the large oil hole 22 exposes the valve seat 4. A large amount of fuel flows out through the large oil hole 22 and sprays out through the volume reduction block 2 and the tight seat 1. At this time, a fuel injection process is completed. When the plunger body 16 moves up to a certain position, the upper space of the plunger body 16 is connected to the oil return pipe 17, and the fuel flows out through the oil return pipe 17 and pushes the steel ball 19 away, and the pin 18 limits the position of the steel ball. As the oil pressure drops, the valve core 20 falls back into the oil outlet valve seat 4 under the action of the oil outlet valve spring 3 .

[0038] When the tappet body 11 moves downward, the plunger spring 10 pushes the spring lower seat 13 and drives the plunger body 16 to move downward, the upper space of the plunger body 16 becomes larger, forming a negative pressure. Since the return pipe 17 is provided with a steel ball 19, the oil inlet from the return pipe 17 is blocked, and the fuel enters the upper space of the plunger body 16 from the oil inlet pipe 6, thereby completing the oil suction and preparing for the next injection. During the up and down movement of the plunger body 16, the ball head 26 of the oil control sleeve 9 can be turned to rotate the oil control sleeve 9, thereby driving the plunger body 16 to rotate to control the injection amount.

[0039] To summarize, by providing an integrated flange structure 14 of the pump body 7, the problem of low rigidity of the split pump body 7 is solved, the problem of the oil pump being stuck due to easy deformation is avoided, and the stability of the oil pump is enhanced; by providing the oil inlet pipe 6 and the oil return pipe 17, the impact of shock waves in the oil pipe during a single-tube design is avoided, thereby enhancing the working stability of the fuel injection pump; by providing a steel ball 19 in the oil return pipe 17, the oil discharged from the position of the oil return pipe 17 is prevented from returning to the pump body 7; by providing the support body 8, the working stability of the plunger spring 10 is improved, thereby improving the operating stability of the pump body 7.

[0040] Based on the above ideal embodiments of the utility model, the relevant staff can make various changes and modifications without deviating from the technical concept of the utility model through the above description. The technical scope of the utility model is not limited to the content of the specification, and its technical scope must be determined according to the scope of the claims.

Claims

1. A single-cylinder pump with oil return, characterized in that, Comprising: A pump body (7) and a tappet body (11), the tappet body (11) is arranged below the pump body (7), a flange structure (14) is integrally arranged on the outer side wall of the pump body (7), an oil inlet hole and an oil discharge hole are formed in the pump body (7), an oil inlet pipe (6) is arranged at the position of the oil inlet hole, a return oil pipe (17) is arranged at the position of the oil discharge hole, a first channel and a second channel are arranged in the return oil pipe (17), the caliber of the first channel is smaller than that of the second channel, a stop pin (18) is arranged on the return oil pipe (17) at the position of the second channel, a steel ball (19) is arranged between the stop pin (18) and the first channel, and the radius of the steel ball (19) is larger than that of the first channel.

2. The single-cylinder pump with oil return as claimed in claim 1, wherein: A spring lower seat (13) is arranged in the pump body (7) above the tappet body (11), a plunger body (16) is arranged on the top surface of the spring lower seat (13), and a plunger spring (10) is sleeved on the plunger body (16).

3. The single-cylinder pump with oil return as claimed in claim 2, wherein: A tight seat (1) is arranged at the connection position of the plunger body (16) and the top surface of the pump body (7), a valve core (20) is arranged between the tight seat (1) and the top of the plunger body (16), an oil outlet valve spring (3) is sleeved on the top of the valve core (20), an oil outlet valve seat (4) is arranged at the bottom of the oil outlet valve spring (3), a sealing washer (5) is arranged at the bottom of the oil outlet valve seat (4), and a volume reduction block (2) is arranged between the oil outlet valve spring (3) and the position near the top of the tight seat (1).

4. The single-cylinder pump with oil return according to claim 3, characterized in that: A middle hole (23) is formed at the central position of the valve core (20), a large oil hole (22) is formed on the valve core (20) at the lower position of the middle hole (23), and a small oil hole (21) is formed on the valve core (20) at the upper position of the middle hole (23).

5. The single-cylinder pump with oil return as claimed in claim 4, characterized in that: A support body (8) is arranged at the bottom of the pump body (7), the support body (8) is fixed on the pump body (7) through a pin body (15), a notch (28) is arranged on the support body (8), two end faces are formed on both sides of the notch (28), pin holes (29) are formed on the support body (8) near the end face positions, the included angle between the connection line of one end face and one pin hole (29) is a, a is less than or equal to 28°, and the included angle between the connection line of the other end face and the other pin hole (29) is b, b is less than or equal to 48°.

6. The single-cylinder pump with oil return as claimed in claim 5, wherein: An oil quantity control sleeve (9) is sleeved on the surface of the plunger body (16), the oil quantity control sleeve (9) is arranged between the pump body (7) and the support body (8), an opening groove (27) is arranged on the oil quantity control sleeve (9), and a part of the plunger body (16) extends into the opening groove (27).

7. The single-cylinder pump with oil return according to claim 6, characterized in that: A limiting groove is formed on the inner wall of the oil quantity control sleeve (9).

8. The single-cylinder pump with oil return as claimed in claim 7, wherein: A cushion block (12) is arranged at the bottom of the spring lower seat (13), a receiving hole is arranged on the tappet body (11), and a part of the spring lower seat (13), the spring lower seat (13) and the cushion block (12) are all arranged in the receiving hole.

9. The single-cylinder pump with oil return according to claim 8, characterized in that: A roller pin (25) is provided on the tappet body (11), and a notch (24) is provided on the tappet body (11). The notch (24) is provided on one side of the roller pin (25).

10. A single-cylinder pump with oil return as described in claim 9, characterized in that: A ball head (26) is installed on the fuel quantity control sleeve (9).

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