Pressure adjusting mechanism of fuel injection pump

Abstract

The utility model provides a fuel injection pump pressure regulating mechanism, the fuel injection pump comprises a nozzle connecting pipe, a connecting cavity, an electromagnetic valve and a pump seat, the upper part of the pump seat is connected with the nozzle connecting pipe through the connecting cavity, the electromagnetic valve is arranged at one side of the connecting cavity, the center of the pump seat is provided with a cavity, and a liquid inlet pipeline and a liquid outlet pipeline are arranged below the cavity. The output end of the cavity is communicated with a shunting channel, the shunting channel flows out in two sections, and the tightening force of the adjusting seat is adjusted through an external tool, so that the spring is adjusted to be stretched or compressed, and when the adjusting seat is loosened, the spring is stretched to push the copper plug to extrude towards the accommodating cavity; after the oil in the containing cavity is extruded, the internal pressure of the electromagnetic valve communicated with the upper portion is increased, finally, the pressure of the nozzle connecting pipe is increased, the spring is compressed when the adjusting base is tightened, the copper plug is driven to leave the containing cavity, the pressure of the oil in the containing cavity is reduced, the internal pressure of the electromagnetic valve communicated with the upper portion is reduced, and finally, the nozzle is connected.

Description

TECHNICAL FIELD

[0001] The utility model relates to gear pump technical field, more specifically, relate to a pressure regulating mechanism of fuel injection pump. BACKGROUND

[0002] Gear pump is the rotary pump that the volume variation and removal formed between pump cylinder and meshing gear are relied on to transport liquid or make it pressurized. Two closed spaces are formed by two gears, pump body and front and back cover, when the gear rotates, the volume of the space on the gear disengaging side changes from small to big, vacuum is formed, liquid is sucked, the volume of the space on the gear engaging side changes from big to small, and liquid is extruded into the pipeline.

[0003] The pressure of the oil injection nozzle needs to reach a certain value to meet the requirements, the existing fuel injection pump, the pressure of the oil injection nozzle is unstable, and the pressure size cannot be controlled. UTILITY MODEL CONTENTS

[0004] Therefore, in order to solve the above problems, the utility model provides a pressure regulating mechanism of fuel injection pump, the size of the tightening force of the adjusting seat 64 is adjusted through external tools, so as to adjust the stretching or compression of the spring 63, when the adjusting seat 64 is loosened, the spring 63 is stretched, the copper plug head 62 is extruded to the accommodation chamber 65, the oil in the accommodation chamber 65 is extruded, the internal pressure of the electromagnetic valve 3 connected with the upper part becomes larger, finally the pressure of the nozzle connecting pipe 1 becomes larger, when the adjusting seat 64 is tightened, the spring 63 is compressed, the copper plug head 62 is removed from the accommodation chamber 65, the oil pressure in the accommodation chamber 65 is reduced, the internal pressure of the electromagnetic valve 3 connected with the upper part becomes smaller, finally the pressure of the nozzle connecting pipe 1 becomes smaller.

[0005] The utility model relates to a pressure regulating mechanism of fuel injection pump, fuel injection pump includes nozzle connecting pipe 1, connecting chamber 2, solenoid valve 3, pump base 4, the pump base 4 is connected nozzle connecting pipe 1 through connecting chamber 2 above, solenoid valve 3 is arranged in one side of connecting chamber 2, the center of pump base 4 is equipped with cavity 45, cavity 45 below is equipped with liquid inlet pipeline 52 and liquid outlet pipeline 7, the output end of cavity 45 is connected with a shunt channel 48, oil flows into cavity 45 from liquid inlet pipeline 52, and it flows into shunt channel 48 through gear engagement ceaselessly, then it flows out from shunt channel 48 in two sections, one section is communicated to solenoid valve 3 upwards, and the other section is communicated into second chamber 6 downwards, it is characterized by: second chamber 6 is equipped with pressure regulating mechanism 61 and accommodation chamber 65 in the input end of liquid outlet pipeline 7, pressure regulating mechanism 61 is arranged in second chamber 6, and pressure regulating mechanism 61 includes copper plug head 62, spring 63 and adjusting seat 64, adjusting seat 64 is sleeved in one end of second chamber 6, one end of spring 63 is sleeved on adjusting seat 64, and the other end of spring 63 is connected with one end of copper plug head 62, the other end of copper plug head 62 is placed in accommodation chamber 65, the size of the screwing force of adjusting seat 64 is adjusted through external tool, thereby the spring 63 is stretched or compressed, when loosening adjusting seat 64, the spring 63 is stretched, and copper plug head 62 is extruded to accommodation chamber 65, after the oil in accommodation chamber 65 is extruded, the internal pressure of solenoid valve 3 connected with upper portion becomes big, and finally the pressure of nozzle connecting pipe 1 becomes big, when tightening adjusting seat 64, the spring 63 is compressed, and copper plug head 62 is withdrawn from accommodation chamber 65, the oil pressure in accommodation chamber 65 reduces, and the internal pressure of solenoid valve 3 connected with upper portion becomes small, and finally the pressure of nozzle connecting pipe 1 becomes small, copper plug head 62 is hollow structure, and copper plug head 62 end is equipped with exhaust hole 621, which is used to ensure that the air in the oil pump is not enough to push open copper plug head 62 under low flow, and liquid inlet pipeline 52, second chamber 6 and liquid outlet pipeline 7 still can form a loop.

[0006] Further, when the pressure in accommodation chamber 65 is big, the pressure regulating mechanism 61 is pushed outwards, one side of accommodation chamber 65 is connected with liquid outlet pipeline 7, the outlet of liquid outlet pipeline 7 is connected with the oil tank at the liquid inlet pipeline 52, so that liquid inlet pipeline 52 and liquid outlet pipeline 7 form a loop.

[0007] Further, the diameter of exhaust hole 621 is 0.3mm.

[0008] Further, the exhaust hole 621 extends to the internal direction of copper plug head 62 with inclined surface 622, so that the air or oil is easy to diffuse.

[0009] Further, the end of second chamber 6 close to copper plug head is equipped with limiting structure 66, the inner wall of limiting structure 66 is cylindrical, which is used to guide copper plug head 62, and prevent copper plug head 62 from being dislocated when moving forwards and backwards.

[0010] Furthermore, one side of the limiting structure 66 is provided with an opening 661, which is connected to the liquid outlet pipe 7.

[0011] Furthermore, the second chamber 6 is provided with a limiting step 67 at one end near the copper plug head. One end of the limiting step 67 is engaged with the copper plug head 62, and the other end is flush with the other end of the copper plug head 62. The flush end is the position of the maximum compression of the spring.

[0012] Furthermore, the adjusting seat 64 is threadedly connected to the inner wall of the second chamber 6, and a groove 641 is provided in the middle of the outer wall of the adjusting seat 64 for adding a sealing ring. A sealing ring is provided at the end of the second chamber 6 near the copper plug head 62, so that the inside of the second chamber is a vacuum.

[0013] Furthermore, a rotating shaft 41 is sleeved vertically inside the cavity 45. An external gear 42 is provided at the top of the rotating shaft 41, and 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 and the internal gear 43 disengage. 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 the diversion channel 48. Oil flows into the negative pressure chamber of the crescent plate 44 from the inlet pipe 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, and then flowing into the diversion channel 48 and flowing out in two sections.

[0014] The beneficial effects of this utility model are as follows: This utility model proposes a pressure regulating mechanism for an injection pump. The 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 upper part of the pump base 4 through the connecting cavity 2. The solenoid valve 3 is located on one side of the connecting cavity 2. A cavity 45 is provided in the center of the pump base 4. An inlet pipe 52 and an outlet pipe 7 are also provided below the cavity 45. The output end of the cavity 45 is connected to a diversion channel 48. Oil flows into the cavity 45 from the inlet pipe 52, and flows into the diversion channel 48 through continuous gear engagement. Then, it flows out from the diversion channel 48 in two sections. One section flows upward into the solenoid valve 3, and the other section flows downward into the second chamber 6. The second chamber 6 is located at the input end of the outlet pipe 7. The second chamber 6 is provided with a pressure regulating mechanism 61 and a receiving chamber 65. The receiving chamber 65 is located at the output end of the diversion channel 48. The pressure regulating mechanism 61 includes a copper plug head 62, a spring 63, and an adjusting seat 64. The adjusting seat 64 is sleeved on one end of the second chamber 6. One end of the spring 63 is sleeved on the adjusting seat 64, and the other end of the spring 63 is connected to one end of the copper plug head 62. The other end of the copper plug head 62 is placed inside the receiving chamber 65. The tightening force of the adjusting seat 64 is adjusted by an external tool, thereby adjusting the stretching or compression of the spring 63. When the adjusting seat 64 is loosened, the spring 63 stretches, pushing the copper plug head 62 to squeeze into the receiving chamber 65. After the oil in the receiving chamber 65 is squeezed, the internal pressure of the solenoid valve 3 connected to the upper part increases, and finally the pressure of the nozzle connecting pipe 1 increases. When the adjusting seat 64 is tightened, the spring 63 is compressed, driving the copper plug head 62 to withdraw from the receiving chamber 65. The oil pressure in the receiving chamber 65 decreases, causing the internal pressure of the solenoid valve 3 connected to the upper part to decrease, and finally the pressure of the nozzle connecting pipe 1 decreases. Attached Figure Description

[0015] Figure 1 This is an overall structural diagram of the pressure regulating mechanism of the fuel injection pump of this utility model.

[0016] Figure 2 This is an overall cross-sectional view of the pressure regulating mechanism of the fuel injection pump of this utility model.

[0017] Figure 3 This is a partial cross-sectional view of the pressure regulating mechanism of the fuel injection pump of this utility model.

[0018] Figure 4 This is a structural diagram of the pressure regulating mechanism of the fuel injection pump of this utility model.

[0019] Figure 5 This is a side view of the pump base of the fuel injection pump of this utility model when there is no pressure adjustment mechanism.

[0020] Figure 6 This is a cross-sectional view of the pump base of the pressure regulating mechanism of the fuel injection pump of this utility model.

[0021] Explanation of main component symbols

[0022] Nozzle connecting pipe 1, connecting cavity 2, solenoid valve 3, pump base 4, rotating shaft 41, external gear 42, internal gear 43, crescent plate 44, cavity 45, diversion channel 48, liquid inlet pipe 52, second chamber 6, pressure regulating mechanism 61, copper plug 62, vent hole 621, inclined surface 622, spring 63, adjusting seat 64, groove 641, accommodating chamber 65, limiting structure 66, opening 661, limiting step 67, liquid outlet pipe 7.

[0023] The following detailed description, in conjunction with the accompanying drawings, will further illustrate this utility model. Detailed Implementation Example 1:

[0024] A pressure regulating mechanism for 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 upper part 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. An inlet pipe 52 and an outlet pipe 7 are also provided below the cavity 45. The output end of the cavity 45 is connected to a diversion channel 48. Fuel flows into the cavity 45 from the inlet pipe 52 and flows into the diversion channel through continuous meshing of gears. 48. Then, the liquid flows out in two sections from the diversion channel 48. One section flows upward into the solenoid valve 3, and the other section flows downward into the second chamber 6. The second chamber 6 is located at the input end of the outlet pipe 7. The second chamber 6 contains a pressure regulating mechanism 61 and a receiving chamber 65. The receiving chamber 65 is located at the output end of the diversion channel 48. The pressure regulating mechanism 61 includes a copper plug head 62, a spring 63, and an adjusting seat 64. The adjusting seat 64 is sleeved on one end of the second chamber 6. One end of the spring 63 is sleeved on the adjusting seat 64, and the other end of the spring 63 is connected to one end of the copper plug head 62. The other end of the copper plug head 62 is placed in the receiving chamber 65. The tightening force of the adjusting seat 64 is adjusted by an external tool, thereby adjusting the extension or compression of the spring 63. When the adjusting seat 64 is loosened, the spring 63 is extended, pushing the copper plug head 62 into the receiving chamber 65. The oil in the receiving chamber 65 is squeezed, which increases the internal pressure of the solenoid valve 3 connected to the upper part, and finally the nozzle... When the pressure in connecting pipe 1 increases, the spring 63 is compressed when the adjusting seat 64 is tightened, which drives the copper plug head 62 to retract from the receiving chamber 65. The oil pressure in the receiving chamber 65 decreases, which reduces the internal pressure of the solenoid valve 3 connected to the upper part, and finally reduces the pressure in the nozzle connecting pipe 1. The copper plug head 62 has a hollow structure and an exhaust hole 621 is provided at the end of the copper plug head 62 to ensure that the inlet pipe 52, the second chamber 6, and the outlet pipe 7 can still form a circuit when the air in the oil pump is insufficient to open the copper plug head 62 under low flow conditions.

[0025] When the pressure inside the accommodating chamber 65 is high, it pushes the pressure regulating mechanism 61 outward. One side of the accommodating chamber 65 is connected to the liquid outlet pipe 7. The outlet of the liquid outlet pipe 7 is connected to 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.

[0026] The diameter of the exhaust port 621 is 0.3 mm.

[0027] The vent 621 has a bevel 622 extending inward toward the copper plug 62, which facilitates the diffusion of air or oil.

[0028] The second chamber 6 is provided with a limiting structure 66 at one end near the copper plug. The inner wall of the limiting structure 66 is cylindrical and is used to guide the copper plug 62 to prevent the copper plug 62 from being misaligned when it moves back and forth.

[0029] The limiting structure 66 has an opening 661 on one side, and the opening 661 is connected to the liquid outlet pipe 7.

[0030] The second chamber 6 has a limiting step 67 at one end near the copper plug. One end of the limiting step 67 is engaged with the copper plug 62, and the other end is flush with the other end of the copper plug 62. The flush end is the position of the maximum compression of the spring.

[0031] The adjusting seat 64 is threadedly connected to the inner wall of the second chamber 6. A groove 641 is provided in the middle of the outer wall of the adjusting seat 64 for adding a sealing ring. A sealing ring is provided at the end of the second chamber 6 near the copper plug head 62, so that the inside of the second chamber is a vacuum.

[0032] A rotating shaft 41 is sleeved vertically inside the cavity 45. 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 and the internal gear 43 disengage. 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 the diversion channel 48. Oil flows into the negative pressure chamber of the crescent plate 44 from the inlet pipe 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, and then flowing into the diversion channel 48 and flowing out in two sections.

[0033] The beneficial effects of this utility model are as follows: This utility model proposes a pressure regulating mechanism for an injection pump. The 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 upper part of the pump base 4 through the connecting cavity 2. The solenoid valve 3 is located on one side of the connecting cavity 2. A cavity 45 is provided in the center of the pump base 4. An inlet pipe 52 and an outlet pipe 7 are also provided below the cavity 45. The output end of the cavity 45 is connected to a diversion channel 48. Oil flows into the cavity 45 from the inlet pipe 52, and flows into the diversion channel 48 through continuous gear engagement. Then, it flows out from the diversion channel 48 in two sections. One section flows upward into the solenoid valve 3, and the other section flows downward into the second chamber 6. The second chamber 6 is located at the input end of the outlet pipe 7. The second chamber 6 is provided with a pressure regulating mechanism 61 and a receiving chamber 65. The receiving chamber 65 is located at the output end of the diversion channel 48. The pressure regulating mechanism 61 includes a copper plug head 62, a spring 63, and an adjusting seat 64. The adjusting seat 64 is sleeved on one end of the second chamber 6. One end of the spring 63 is sleeved on the adjusting seat 64, and the other end of the spring 63 is connected to one end of the copper plug head 62. The other end of the copper plug head 62 is placed inside the receiving chamber 65. The tightening force of the adjusting seat 64 is adjusted by an external tool, thereby adjusting the stretching or compression of the spring 63. When the adjusting seat 64 is loosened, the spring 63 stretches, pushing the copper plug head 62 to squeeze into the receiving chamber 65. After the oil in the receiving chamber 65 is squeezed, the internal pressure of the solenoid valve 3 connected to the upper part increases, and finally the pressure of the nozzle connecting pipe 1 increases. When the adjusting seat 64 is tightened, the spring 63 is compressed, driving the copper plug head 62 to withdraw from the receiving chamber 65. The oil pressure in the receiving chamber 65 decreases, causing the internal pressure of the solenoid valve 3 connected to the upper part to decrease, and finally the pressure of the nozzle connecting pipe 1 decreases.

[0034] The embodiments described above are merely illustrative of several implementations of this utility model, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of this utility model patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this utility model, and these all fall within the protection scope of this utility model. Therefore, the protection scope of this utility model patent should be determined by the appended claims.

Claims

1. A pressure regulating mechanism for an injection pump, the injection pump comprising a nozzle connecting pipe (1), a connecting cavity (2), a solenoid valve (3), and a pump base (4), wherein the nozzle connecting pipe (1) is connected above the pump base (4) via 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), and an inlet pipe (52) and an outlet pipe (7) are provided below the cavity (45), the output end of the cavity (45) is connected to a diversion channel (48), oil flows into the cavity (45) from the inlet pipe (52), and flows into the diversion channel (48) through continuous meshing of gears, and then flows out from the diversion channel (48) in two sections, one section flowing upward into the solenoid valve (3), and the other section flowing downward into the second chamber (6), characterized in that: The second chamber (6) is located at the inlet end of the outlet pipe (7). The second chamber (6) is equipped with a pressure regulating mechanism (61) and a receiving chamber (65). The receiving chamber (65) is located at the outlet end of the diversion channel (48). The pressure regulating mechanism (61) includes a copper plug (62), a spring (63), and an adjusting seat (64). The adjusting seat (64) is sleeved on one end of the second chamber (6). One end of the spring (63) is sleeved on the adjusting seat (64), and the other end of the spring (63) is connected to one end of the copper plug (62). The other end of the copper plug (62) is placed in the receiving chamber (65). The tightening force of the adjusting seat (64) is adjusted by an external tool, thereby adjusting the stretching or compression of the spring (63). When the adjusting seat (64) is loosened, the spring... The spring (63) is stretched, pushing the copper plug (62) to squeeze into the accommodating chamber (65). After the oil in the accommodating chamber (65) is squeezed, the internal pressure of the solenoid valve (3) connected to the upper part increases, and finally the pressure of the nozzle connecting pipe (1) increases. When the adjusting seat (64) is tightened, the spring (63) is compressed, which drives the copper plug (62) to withdraw from the accommodating chamber (65). The oil pressure in the accommodating chamber (65) decreases, which makes the internal pressure of the solenoid valve (3) connected to the upper part decrease, and finally the pressure of the nozzle connecting pipe (1) decreases. The copper plug (62) is a hollow structure. The end of the copper plug (62) is provided with an exhaust hole (621) to ensure that the inlet pipe (52), the second chamber (6), and the outlet pipe (7) can still form a circuit when the air in the oil pump is insufficient to open the copper plug (62) under low flow conditions.

2. The pressure regulating mechanism of the fuel injection pump as described in claim 1, characterized in that: The diameter of the exhaust port (621) is 0.3 mm.

3. The pressure regulating mechanism of the fuel injection pump as described in claim 1, characterized in that: The vent (621) has a bevel (622) extending inward toward the copper plug (62), which facilitates the diffusion of air or oil.

4. The pressure regulating mechanism of the fuel injection pump as described in claim 1, characterized in that: When the pressure inside the accommodating chamber (65) is high, the pressure regulating mechanism (61) is pushed outward. One side of the accommodating chamber (65) is connected to the liquid outlet pipe (7). The outlet of the liquid outlet pipe (7) is connected to 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.

5. The pressure regulating mechanism of the fuel injection pump as described in claim 1, characterized in that: The second chamber (6) has a limiting structure (66) at one end near the copper plug. The inner wall of the limiting structure (66) is cylindrical and is used to guide the copper plug (62) to prevent the copper plug (62) from being misaligned when it moves back and forth.

6. The pressure regulating mechanism of the fuel injection pump as described in claim 5, characterized in that: The limiting structure (66) has an opening (661) on one side, and the opening (661) is connected to the liquid outlet pipe (7).

7. The pressure regulating mechanism of the fuel injection pump as described in claim 1, characterized in that: The second chamber (6) has a limiting step (67) at one end near the copper plug. One end of the limiting step (67) is engaged with the copper plug (62), and the other end is flush with the other end of the copper plug (62). The flush end is the position of the maximum compression of the spring.

8. The pressure regulating mechanism of the fuel injection pump as described in claim 1, characterized in that: The adjusting seat (64) is threaded to the inner wall of the second chamber (6). A groove (641) is provided in the middle of the outer wall of the adjusting seat (64) for adding a sealing ring. A sealing ring is provided at one end of the second chamber (6) near the copper plug (62) so that the inside of the second chamber is a vacuum.

9. The pressure regulating mechanism of the fuel injection pump as described in claim 1, characterized in that: A rotating shaft (41) is sleeved vertically inside the cavity (45). 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) and the internal gear (43) disengage. 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 the diversion channel (48). Oil flows into the negative pressure chamber of the crescent plate (44) from the inlet pipe (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), and then flowing into the diversion channel (48) and flowing out in two sections.

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