A pressure regulating system for fuel injection pumps

Abstract

The present application provides a kind of pressure regulating system of fuel injection pump, pressure regulating system includes 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, cavity is also equipped with liquid inlet pipeline and liquid outlet pipeline below, the output end of cavity is communicated with a shunt passage, shunt passage flows out in two sections, the size of the force of tightening of adjusting seat is adjusted by external tool, so as to adjust spring stretch or compression, when adjusting seat is loosened, spring stretch, copper plug head is extruded to containing chamber, oil in containing chamber is extruded, so that the internal pressure of solenoid valve connected with upper portion becomes larger, finally nozzle connecting pipe pressure becomes larger, when tightening adjusting seat, spring compression, copper plug head is removed from containing chamber, the pressure of oil in containing chamber is reduced, so that the internal pressure of solenoid valve connected with upper portion becomes smaller, finally nozzle connecting pipe pressure becomes smaller.

Description

Technical Field

[0001] This invention relates to the field of gear pump technology, and more specifically, to a pressure regulating system for an injection pump. Background Technology

[0002] A gear pump is a rotary pump that transports or pressurizes liquids by relying on the change and movement of the working volume formed between the pump cylinder and meshing gears. It consists of two gears, a pump body, and front and rear covers forming two enclosed spaces. When the gears rotate, the volume of the space on the disengaged side of the gears increases from small to large, creating a vacuum that draws in the liquid. Conversely, the volume of the space on the meshing side of the gears decreases from large to small, forcing the liquid into the pipeline.

[0003] The pressure of the fuel injector needs to reach a certain value to meet the requirements. However, the pressure of the existing fuel injection pump and fuel injector is unstable and cannot be controlled. Summary of the Invention

[0004] In view of this, in order to solve the above problems, the present invention proposes a pressure regulation system for an injection pump. The tightening force of the regulating seat 64 is adjusted by an external tool, thereby adjusting the tension or compression of the spring 63. When the regulating seat 64 is loosened, the spring 63 is stretched, pushing the copper plug head 62 into the receiving chamber 65. After the oil in the receiving chamber 65 is compressed, 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 regulating seat 64 is tightened, the spring 63 is compressed, causing the copper plug head 62 to withdraw from the receiving chamber 65. The oil pressure in the receiving chamber 65 decreases, which decreases the internal pressure of the solenoid valve 3 connected to the upper part, and finally the pressure of the nozzle connecting pipe 1 decreases.

[0005] A pressure regulating system for an 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 via the connecting cavity 2. The solenoid valve 3 is located 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 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 then into the diversion channel 48 through continuous gear engagement. The oil then flows out of the diversion channel 48 in two sections, one section flowing upwards into the solenoid valve 3, and the other section flowing downwards into a 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 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, and one end of the spring 63 is sleeved on the adjusting seat 64. The other end of the spring 63 is connected to one end of the copper plug head 62, and 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 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, which decreases the internal pressure of the solenoid valve 3 connected to the upper part, and finally the pressure of the nozzle connecting pipe 1 decreases.

[0006] Furthermore, a pressure sensor is installed inside the accommodating chamber 65. The pressure sensor is wirelessly connected to an external display device. The pressure inside the accommodating chamber 65 is monitored in real time through the pressure sensor, which facilitates timely adjustment of the regulating seat 64 and ensures that the pressure of the entire pressure regulating system remains constant.

[0007] Furthermore, 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, and the liquid 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.

[0008] Furthermore, the copper plug head 62 has a hollow structure, and the end of the copper plug head 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 head 62 under low flow conditions.

[0009] Furthermore, 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, which is used to guide the copper plug 62 and prevent the copper plug 62 from being misaligned when it moves back and forth.

[0010] Furthermore, one side of the limiting structure 66 is provided with an opening 661, which is connected to the liquid outlet channel 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 invention: This invention proposes a pressure regulating system for an injection pump. The pressure regulating system 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 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. 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 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 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, which decreases the internal pressure of the solenoid valve 3 connected to the upper part, 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 regulation system of the fuel injection pump of the present invention.

[0016] Figure 2 This is an overall cross-sectional view of the pressure regulation system of the fuel injection pump of the present invention.

[0017] Figure 3 This is a partial cross-sectional view of the pressure regulation system of the fuel injection pump of the present invention.

[0018] Figure 4 This is a structural diagram of the pressure regulating mechanism of the fuel injection pump pressure regulating system of the present invention.

[0019] Figure 5 This is a side view of the pump base of the fuel injection pump pressure regulating system of the present invention when there is no pressure regulating mechanism.

[0020] Figure 6 This is a cross-sectional view of the pump base of the pressure regulating system of the fuel injection pump of the present invention.

[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, 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 the present invention. Detailed Implementation

[0024] Example 1:

[0025] A pressure regulating system for an 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 via the connecting cavity 2. The solenoid valve 3 is located 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 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 then into the diversion channel 48 through continuous gear engagement. The oil then flows out of the diversion channel 48 in two sections, one section flowing upwards into the solenoid valve 3, and the other section flowing downwards into a 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 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, and one end of the spring 63 is sleeved on the adjusting seat 64. The other end of the spring 63 is connected to one end of the copper plug head 62, and 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 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, which decreases the internal pressure of the solenoid valve 3 connected to the upper part, and finally the pressure of the nozzle connecting pipe 1 decreases.

[0026] The accommodating chamber 65 is equipped with a pressure sensor, which is wirelessly connected to an external display device. The pressure in the accommodating chamber 65 is monitored in real time through the pressure sensor, which facilitates timely adjustment of the regulating seat 64 and ensures that the pressure of the entire pressure regulating system remains constant.

[0027] 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.

[0028] The copper plug head 62 has a hollow structure and an exhaust hole 621 at its end. This ensures 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 at low flow rates.

[0029] 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.

[0030] The limiting structure 66 has an opening 661 on one side, and the opening 661 is connected to the liquid outlet channel 7.

[0031] 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.

[0032] 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.

[0033] 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.

[0034] The beneficial effects of this invention: This invention proposes a pressure regulating system for an injection pump. The pressure regulating system 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 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. 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 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 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, which decreases the internal pressure of the solenoid valve 3 connected to the upper part, and finally the pressure of the nozzle connecting pipe 1 decreases.

[0035] The embodiments described above are merely illustrative of several implementations of the present invention, and while the descriptions are specific and detailed, they should not be construed as limiting the scope of the present invention. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these modifications and improvements all fall within the scope of protection of the present invention. Therefore, the scope of protection of this patent should be determined by the appended claims.

Claims

1. A pressure regulating system for an injection pump, the pressure regulating system 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) contains 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 inside the receiving chamber (65) and connected to the outside. The tool adjusts the tightening force of the adjusting seat (64), 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 (62) 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, driving the copper plug (62) to withdraw from the accommodating chamber (65). The oil pressure in the accommodating 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.

2. The pressure regulating system for the fuel injection pump as described in claim 1, characterized in that: The accommodating chamber (65) is equipped with a pressure sensor, which is wirelessly connected to an external display device. The pressure in the accommodating chamber (65) is monitored in real time through the pressure sensor, which facilitates timely adjustment of the regulating seat (64) and ensures that the pressure of the entire pressure regulating system is constant.

3. The pressure regulating system for 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.

4. The pressure regulating system for the fuel injection pump as described in claim 1, characterized in that: The copper plug (62) has a hollow structure and an exhaust hole (621) is provided at the end of the copper plug (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 (62) under low flow conditions.

5. The pressure regulating system for 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 system for 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 system for 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 system for 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 system for 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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