Filtering structure of fuel injection pump

Abstract

The fuel injection pump comprises a nozzle connecting pipe, a connecting cavity, an electromagnetic valve and a pump base, a cavity is formed in the center of the pump base, a liquid inlet pipeline and a liquid outlet pipeline are further arranged below the cavity, the input end of the cavity is communicated with a liquid inlet channel, the output end of the cavity is communicated with a flow dividing channel, and oil flows into the cavity from the liquid inlet pipeline and flows into the cavity from the liquid outlet pipeline. A first cavity is connected between the cavity and the liquid inlet pipeline, a filtering structure is arranged in the first cavity in a sleeved mode, a passageway is formed between the first cavity and the filtering structure, and the first cavity is communicated with the liquid inlet pipeline through the first cavity and the filtering structure. The input end of the clamping channel is connected with the output end of the liquid inlet pipeline, the output end of the clamping channel communicates with the input end of the cavity, oil flows into the first cavity from the liquid inlet pipeline, enters the liquid inlet channel from the clamping channel after impurities are filtered out through the filtering structure and then enters the cavity, and damage to gears in the cavity is prevented.

Description

TECHNICAL FIELD

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

[0002] Gear pump is the rotary pump that the volume change 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 disengagement side changes from small to big, forms vacuum, absorbs liquid, the volume of the space on the gear meshing side changes from big to small, and liquid is extruded into the pipeline.

[0003] The existing fuel injection pump, because the oil contains more impurities, long-term use can cause damage to the gear, affect work efficiency. UTILITY MODEL CONTENTS

[0004] Therefore, in order to solve the above problems, the utility model provides a filter structure of fuel injection pump, the fuel injection pump includes nozzle connecting pipe 1, connecting cavity 2, electromagnetic valve 3, pump base 4, the pump base 4 is connected nozzle connecting pipe 1 through connecting cavity 2 on the top, the electromagnetic valve 3 is arranged in one side of connecting cavity 2, the center of pump base 4 is equipped with cavity 45, and the lower side of cavity 45 is also equipped with liquid inlet pipeline 52 and liquid outlet pipeline 7, the input end of cavity 45 is connected with a liquid inlet channel 46, the output end of cavity 45 is connected with a shunt channel 48, oil flows into cavity 45 from liquid inlet pipeline 52, and flows into shunt channel 48 by the continuous meshing of gear, then flows out from shunt channel 48 in two sections, one section is connected to electromagnetic valve 3 upwards, and the other section is connected to second chamber 6 downwards, characterized in that: the first chamber 5 is connected between cavity 45 and liquid inlet pipeline 52, the filter structure 51 is sleeved in the first chamber 5, the first chamber 5 and filter structure 51 form a passageway, the input end of the passageway is connected with the output end of liquid inlet pipeline 52, the output end of the passageway is communicated with the input end of cavity 45, oil flows into the first chamber 5 from liquid inlet pipeline 52, and after the impurities are filtered out by filter structure 51, the oil enters liquid inlet channel 46 from the passageway, then enters cavity 45, to prevent damage to the gear in cavity 45.

[0005] The utility model provides a filter structure of fuel injection pump, fuel injection pump includes nozzle connecting pipe 1, connecting chamber 2, solenoid valve 3, pump base 4, connecting chamber 2 is connected nozzle connecting pipe 1 above the pump base 4, solenoid valve 3 is arranged at one side of connecting chamber 2, the centre of pump base 4 is equipped with cavity 45, and cavity 45 is further equipped with liquid inlet pipeline 52 and liquid outlet pipeline 7 below, the input end of cavity 45 is communicated with a liquid inlet channel 46, and the output end of cavity 45 is communicated with a shunt channel 48, oil flows into cavity 45 from liquid inlet pipeline 52, and flows into shunt channel 48 through the gear constant meshing, then flows out from shunt channel 48 in two sections, one section is communicated with solenoid valve 3 upwards, and the other section is communicated with second chamber 6 downwards, and the utility model is characterized by: the first chamber 5 is connected between cavity 45 and liquid inlet pipeline 52, the filter structure 51 is sleeved in the first chamber 5, the first chamber 5 and filter structure 51 form the passageway between them, the input end of the passageway is connected with the output end of liquid inlet pipeline 52, and the output end of the passageway is communicated with the input end of cavity 45, oil flows into the first chamber 5 from liquid inlet pipeline 52, and then enters liquid inlet channel 46 from the passageway after filtering out impurities by filter structure 51, then enters cavity 45, to prevent the damage to the gear in cavity 45.

[0006] Further, the filter structure 51 includes a bracket 511 and a filter screen 512, the filter screen 512 is cylindrical, and the circumferential surface of the filter screen 512 is densely covered with filter holes 513, so that the filtering coverage area is the circumferential surface of the cylinder, and the filtering area is large.

[0007] Further, the bracket 511 is inserted into and outside the circumferences of the filter screen 512 and integrally molded with the filter screen 512.

[0008] Further, the middle part of the bracket 511 is provided with a plurality of connecting rods 514 around the inner and outer circumferences of the filter screen 512, for fixing the filter screen 512 in the bracket 511 and strengthening the structural strength of the bracket 511.

[0009] Further, one end of the first chamber 5 away from the input end is provided with a rear cover 53, one end of the bracket 511 is clamped to the input end of the first chamber 5, and the other end of the bracket 511 is connected with the rear cover 53.

[0010] Further, the other end of the bracket 511 is interference-fitted with the rear cover 53.

[0011] Further, the two ends of the bracket 511 are both provided with sealing rings at the connection positions with the first chamber 5, so that the two ends of the bracket 511 are sealed.

[0012] Further, the second chamber 6 is provided with a pressure regulating mechanism 61 and a containing chamber 65, one end of the containing chamber 65 is connected with the liquid outlet pipeline 7, the oil liquid in the containing chamber 65 is controlled by adjusting the pressure regulating mechanism 61, when the oil liquid pressure is large, the oil liquid flows into the liquid outlet pipeline 7, 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.

[0013] The utility model discloses a filter structure of fuel injection pump, the fuel injection pump includes nozzle connecting pipe 1, connecting chamber 2, electromagnetic valve 3, pump base 4, the pump base 4 top passes through connecting chamber 2 and connects nozzle connecting pipe 1, electromagnetic valve 3 sets up at one side of connecting chamber 2, the centre of pump base 4 is equipped with cavity 45, still be equipped with liquid inlet pipeline 52 and liquid outlet pipeline 7 below cavity 45, the input end of cavity 45 is communicated with a liquid inlet channel 46, the output end of cavity 45 is communicated with a shunt channel 48, and oil liquid flows into cavity 45 from liquid inlet pipeline 52, and through the gear is constantly engaged and flows into shunt channel 48, then from shunt channel 48 two sections of flow, one section is communicated into electromagnetic valve 3 upwards, and the other section is communicated into second chamber 6 downwards, first chamber 5 is connected between cavity 45 and liquid inlet pipeline 52, filter structure 51 is sleeved in first chamber 5, and the output end of the first chamber 5 and filter structure 51 forms the passageway, the input end of the passageway is connected with the output end of liquid inlet pipeline 52, the output end of the passageway is communicated with the input end of cavity 45, and oil liquid flows into first chamber 5 from liquid inlet pipeline 52, and after the impurity is filtered through filter structure 51, from the passageway into liquid inlet channel 46, then into cavity 45, prevent the damage to the gear in cavity 45. BRIEF DESCRIPTION OF DRAWINGS

[0014] Figure 1 It is the overall structural drawing of the fuel injection pump of the utility model.

[0015] Figure 2 It is the partial section view of the pump base of the fuel injection pump of the utility model.

[0016] Figure 3 It is the partial section view of the filter structure of the fuel injection pump of the utility model.

[0017] Figure 4 It is the structure diagram of the filter structure of the fuel injection pump of the utility model.

[0018] Figure 5 It is the inside section view of the pump base of the fuel injection pump of the utility model.

[0019] MAIN ELEMENT SYMBOL EXPLANATION

[0020] The nozzle connecting pipe 1, the connecting cavity 2, the electromagnetic valve 3, the pump base 4, the cavity 45, the shunt passage 48, the first cavity 5, the filter structure 51, the support 511, the filter screen 512, the filter hole 513, the connecting rod 514, the liquid inlet pipe 52, the rear cover 53, the second cavity 6, the pressure regulating mechanism 61, the containing cavity 65, the liquid outlet pipe 7.

[0021] The following specific embodiments will further illustrate the utility model in conjunction with the above-mentioned drawings. Specific embodiments Embodiment 1

[0022] A filter structure of an oil injection pump, the oil injection pump comprising a nozzle connecting pipe 1, a connecting cavity 2, an electromagnetic valve 3, a pump base 4, the pump base 4 being connected to the nozzle connecting pipe 1 through the connecting cavity 2, the electromagnetic valve 3 being arranged on one side of the connecting cavity 2, the center of the pump base 4 being provided with a cavity 45, the cavity 45 being further provided with a liquid inlet pipe 52 and a liquid outlet pipe 7 below, the input end of the cavity 45 being communicated with a liquid inlet passage 46, the output end of the cavity 45 being communicated with a shunt passage 48, oil flowing from the liquid inlet pipe 52 into the cavity 45, continuously meshing through a gear and flowing into the shunt passage 48, then flowing out from the shunt passage 48 in two sections, one section being communicated with the electromagnetic valve 3 upward, the other section being communicated with a second cavity 6 downward, characterized in that: a first cavity 5 is connected between the cavity 45 and the liquid inlet pipe 52, a filter structure 51 is sleeved in the first cavity 5, a gap is formed between the first cavity 5 and the filter structure 51, the input end of the gap is connected with the output end of the liquid inlet pipe 52, the output end of the gap is communicated with the input end of the cavity 45, oil flowing from the liquid inlet pipe 52 into the first cavity 5, then entering the liquid inlet passage 46 from the gap after impurities are filtered out through the filter structure 51, and then entering the cavity 45, so that damage to the gear in the cavity 45 is prevented.

[0023] The filter structure 51 comprises a support 511 and a filter screen 512, the filter screen 512 being in a cylindrical shape, the circumferential surface of the filter screen 512 being densely covered with filter holes 513, so that the filtering coverage area is the circumferential surface of the cylindrical shape, and the filtering area is large.

[0024] The support 511 is inserted into and outside the circumferences of the filter screen 512 and integrally formed with the filter screen 512 by plastic molding.

[0025] The middle part of the support 511 is provided with a plurality of connecting rods 514 around the inner and outer circumferences of the filter screen 512, for fixing the filter screen 512 in the support 511 and strengthening the structural strength of the support 511.

[0026] One end of the first cavity 5 away from the input end is provided with a rear cover 53, one end of the support 511 is clamped to the input end of the first cavity 5, and the other end of the support 511 is connected with the rear cover 53.

[0027] The other end of the bracket 511 is interference-fitted with the rear cover 53.

[0028] Both ends of the bracket 511 are provided with sealing rings at the connection with the first chamber 5, so that both ends of the bracket 511 are sealed.

[0029] The second chamber 6 is provided with a pressure adjusting mechanism 61 and a containing chamber 65, one end of the containing chamber 65 is connected with the liquid outlet pipeline 7, the oil liquid in the containing chamber 65 is controlled by adjusting the pressure adjusting mechanism 61, when the oil liquid pressure is large, the oil liquid flows into the liquid outlet pipeline 7, 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.

[0030] The utility model discloses a filter structure of fuel injection pump, fuel injection pump includes nozzle connecting pipe 1, connecting chamber 2, electromagnetic valve 3, pump base 4, the pump base 4 top passes through connecting chamber 2 and connects nozzle connecting pipe 1, electromagnetic valve 3 sets up at one side of connecting chamber 2, the centre of pump base 4 is equipped with cavity 45, still be equipped with liquid inlet pipeline 52 and liquid outlet pipeline 7 below cavity 45, the input end of cavity 45 is communicated with a liquid inlet channel 46, the output end of cavity 45 is communicated with a shunt channel 48, and oil liquid flows into cavity 45 from liquid inlet pipeline 52, and through the gear and constantly engages and flows into shunt channel 48, then from shunt channel 48 and divides two sections, one section is communicated with electromagnetic valve 3 upwards, and the other section is communicated into second chamber 6 downwards, first chamber 5 is connected between cavity 45 and liquid inlet pipeline 52, filter structure 51 is sleeved in first chamber 5, and the output end of the first chamber 5 and filter structure 51 forms the passageway, the input end of the passageway is connected with the output end of liquid inlet pipeline 52, the output end of the passageway is communicated with the input end of cavity 45, and oil liquid flows into first chamber 5 from liquid inlet pipeline 52, and after the impurity is filtered through filter structure 51, from the passageway into liquid inlet channel 46, then enters cavity 45, prevents the damage to the gear in cavity 45.

[0031] The above-mentioned embodiments only express several implementation manners of the utility model, and the description is more specific and detailed, but can not be understood as the limitation of the utility model patent scope. It should be pointed out that for ordinary skilled person in the art, without departing from the concept of the utility model, a plurality of deformation and improvement can be made, and these all belong to the protection scope of the utility model. Therefore, the protection scope of the utility model patent should be according to the appended claims.

Claims

1. A filter structure 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 input end of the cavity (45) is connected to an inlet channel (46), and 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 first chamber (5) is connected between the cavity (45) and the liquid inlet pipeline (52), the filter structure (51) is sleeved in the first chamber (5), and a clamping channel is formed between the first chamber (5) and the filter 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). The oil liquid flows into the first chamber (5) from the liquid inlet pipeline (52), and then enters the liquid inlet channel (46) from the clamping channel after impurities are filtered out by the filter structure (51), and then enters the cavity (45), so that the gear in the cavity (45) is prevented from being damaged.

2. The filtering structure of an oil injection pump according to claim 1, wherein: The filter structure (51) comprises a support (511) and a filter screen (512), the filter screen (512) is in a cylindrical shape, the circumferential surface of the filter screen (512) is densely covered with filter holes (513), so that the filtering area is the circumferential surface of the cylindrical shape, and the filtering area is large.

3. The filtering structure of an oil injection pump according to claim 2, wherein: The support (511) is inserted into and outside the circumferential surface of the filter screen (512) and is integrally molded with the filter screen (512).

4. The filtering structure of an oil injection pump according to claim 2, wherein: A plurality of connecting rods (514) are arranged around the inner and outer circumferential surfaces of the filter screen (512) in the middle of the support (511), so as to fix the filter screen (512) in the support (511) and strengthen the structural strength of the support (511).

5. The filtering structure of an oil injection pump according to claim 4, wherein: One end of the support (511) is clamped to the input end of the first chamber (5), and the other end of the support (511) is connected with the rear cover (53).

6. The filtering structure of an oil injection pump according to claim 2, wherein: The other end of the support (511) is in interference fit with the rear cover (53).

7. The filtering structure of an oil injection pump according to claim 2, wherein: Sealing rings are arranged at the connection positions of the two ends of the support (511) and the first chamber (5), so that the two ends of the support (511) are sealed.

8. The filtering structure of an oil injection pump according to claim 1, wherein: The second chamber (6) is provided with a pressure adjusting mechanism (61) and a containing chamber (65), one end of the containing chamber (65) is connected with the liquid outlet pipeline (7), the oil liquid in the containing chamber (65) is controlled by adjusting the pressure adjusting mechanism (61), and when the oil liquid pressure is large, the oil liquid flows into the liquid outlet pipeline (7). The oil outlet of the liquid outlet pipeline (7) is connected with an oil tank at the position of the liquid inlet pipeline (52), so that the liquid inlet pipeline (52) and the liquid outlet pipeline (7) form a loop.

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