Preheating device of fuel injection pump

Abstract

The fuel injection pump comprises a nozzle connecting pipe, a connecting cavity, an electromagnetic valve and a pump seat, the upper portion of the pump seat is connected with the nozzle connecting pipe through the connecting cavity, the electromagnetic valve is arranged on one side of the connecting cavity, a cavity is formed in the center of the pump seat, and 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, oil flows into the cavity from a liquid inlet pipeline, flows into the flow dividing channel through continuous meshing of a gear and then flows out from the flow dividing channel in two sections, one section is upwards led into an electromagnetic valve, and the other section is downwards led into a second cavity. A preheating device is arranged on one side of the connecting cavity, the bottom of the preheating device is arranged on a base of the connecting cavity, the base of the connecting cavity is connected with the pump base, and a preheating plug is arranged in the preheating device and used for preheating and melting viscous liquid in the cavity and the connecting cavity before the fuel injection pump works, so that the flowability of discharged liquid is good, and starting is easy.

Description

TECHNICAL FIELD

[0001] The utility model relates to gear pump technical field, more specifically, relate to a preheating device 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, vacuum is formed, liquid is sucked, 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, the pump body before starting may contain residual viscous liquid, directly into oil liquid leads to gear not easy to discharge viscous liquid, and damage to the gear. UTILITY MODEL CONTENTS

[0004] Therefore, in order to solve the above problems, the utility model provides a preheating device of fuel injection pump, which is preheated before the fuel injection pump works, melts the viscous liquid in the cavity 45 and the connecting cavity 2, so that the outflow liquid has good fluidity and is easy to start

[0005] A preheating device of fuel injection pump, the fuel injection pump comprises a nozzle connecting pipe 1, a connecting cavity 2, an electromagnetic valve 3 and a pump seat 4, the pump seat 4 is connected with the nozzle connecting pipe 1 through the connecting cavity 2, the electromagnetic valve 3 is arranged on one side of the connecting cavity 2, the center of the pump seat 4 is provided with a cavity 45, the cavity 45 is further provided with an inlet pipe 52 and an outlet pipe 7 below, the input end of the cavity 45 is communicated with an inlet channel 46, the output end of the cavity 45 is communicated with a shunt channel 48, the oil liquid flows into the cavity 45 from the inlet pipe 52, continuously meshes with the gear and flows into the shunt channel 48, and then flows out from the shunt channel 48 in two sections, one section of which is communicated with the electromagnetic valve 3 upwards, and the other section is communicated with a second cavity 6 downwards, characterized in that: one side of the connecting cavity 2 is provided with a preheating device 8, the bottom of the preheating device 8 is arranged on the base of the connecting cavity 2, the base of the connecting cavity 2 is connected with the pump seat 4, and the preheating device 8 is provided with a preheating plug, which is used for preheating before the fuel injection pump works, melting the viscous liquid in the cavity 45 and the connecting cavity 2, so that the outflow liquid has good fluidity and is easy to start.

[0006] Further, the preheating device 8 is a hollow structure for placing the preheating plug.

[0007] Further, the preheating device 8 is integrally formed with the connecting cavity 2.

[0008] Further, the cavity 45 is provided with an external gear 42 and an internal gear 43, and one end of the cavity 45 is a negative pressure cavity and the other end is a high pressure cavity, the external gear 42 and the internal gear 43 are continuously meshed to push the oil liquid from the negative pressure cavity into the high pressure cavity, and then flow into the shunt channel 48, the shunt channel 48 is communicated with the first oil injection pipe 21 upward, and the preheating device 8 is close to the bottom of the first oil injection pipe 21, so that the first oil injection pipe 21 is heated first.

[0009] Further, the bottom of the first oil injection pipe 21 is communicated with the high pressure cavity, so that the external gear 42 and the internal gear 43 in the cavity 45 are synchronously heated, and the viscous liquid in the cavity 45 is good in fluidity after being melted, and the external gear 42 and the internal gear 43 are not easily damaged.

[0010] Further, the first oil injection pipe 21 is arranged in the connecting cavity 2, the top of the first oil injection pipe 21 is communicated with the second oil injection pipe 25, and the top of the second oil injection pipe 25 is communicated with the nozzle connecting pipe 1, so that the first oil injection pipe 21, the second oil injection pipe 25 and the nozzle connecting pipe 1 can be sequentially heated.

[0011] The preheating device of the oil injection pump has the advantages that the preheating device of the oil injection pump is provided, the oil injection pump comprises a nozzle connecting pipe 1, a connecting cavity 2, an electromagnetic valve 3 and a pump seat 4, the pump seat 4 is connected with the nozzle connecting pipe 1 through the connecting cavity 2, the electromagnetic valve 3 is arranged on one side of the connecting cavity 2, the center of the pump seat 4 is provided with a cavity 45, the lower portion of the cavity 45 is further provided with an inlet pipeline 52 and an outlet pipeline 7, the input end of the cavity 45 is communicated with an inlet channel 46, the output end of the cavity 45 is communicated with a shunt channel 48, the oil liquid flows into the cavity 45 from the inlet pipeline 52, is continuously meshed by the gear and flows into the shunt channel 48, and then flows out from the shunt channel 48 in two sections, one section of which is communicated with the electromagnetic valve 3 upward, and the other section is communicated with a second cavity 6 downward, one side of the connecting cavity 2 is provided with a preheating device 8, the bottom of the preheating device 8 is arranged on the base of the connecting cavity 2, the base of the connecting cavity 2 is connected with the pump seat 4, the preheating device 8 is provided with a preheating plug, is used for preheating before the oil injection pump works, melts the viscous liquid in the cavity 45 and the connecting cavity 2, so that the outlet liquid is good in fluidity and easy to start. BRIEF DESCRIPTION OF DRAWINGS

[0012] Figure 1 It is a whole structure diagram of the preheating device of the oil injection pump.

[0013] Figure 2 It is a sectional view of the preheating device of the oil injection pump.

[0014] Figure 3 It is a sectional view of the pump seat of the oil injection pump. Figure 1 .

[0015] Figure 4The utility model discloses a pump seat profile of fuel injection pump Figure 2 .

[0016] Main element symbol explanation

[0017] Nozzle connecting pipe 1, connecting cavity 2, first fuel injection pipe 21, second fuel injection pipe 25, electromagnetic valve 3, pump seat 4, external gear 42, internal gear 43, cavity 45, shunt passage 48, second chamber 6, liquid outlet pipeline 7, preheating device 8.

[0018] The following specific embodiments will be further described in conjunction with the above-mentioned drawings. Specific embodiment Embodiment

[0019] A kind of preheating device of fuel injection pump, fuel injection pump includes nozzle connecting pipe 1, connecting cavity 2, electromagnetic valve 3, pump seat 4, the pump seat 4 is connected nozzle connecting pipe 1 by connecting cavity 2 above, the electromagnetic valve 3 is arranged in one side of connecting cavity 2, the center of the pump seat 4 is equipped with cavity 45, cavity 45 below is also equipped with liquid inlet pipeline 52 and liquid outlet pipeline 7, the input end of cavity 45 is communicated with a liquid inlet passage 46, the output end of cavity 45 is communicated with a shunt passage 48, oil liquid flows into cavity 45 from liquid inlet pipeline 52, and it is continuously engaged by gear and flows into shunt passage 48, then from shunt passage 48 two sections are flowed out, one section is communicated into electromagnetic valve 3 upwards, another section is communicated into second chamber 6 downwards, it is characterized in that: one side of the connecting cavity 2 is equipped with preheating device 8, the bottom of the preheating device 8 is equipped on the base of connecting cavity 2, the base of connecting cavity 2 is connected with pump seat 4, preheating plug is equipped in the preheating device 8, for preheating before the work of fuel injection pump, melt viscous liquid in cavity 45 and connecting cavity 2, so that the flowability of liquid outlet liquid is good, easy to start.

[0020] The preheating device 8 is hollow structure, for placing preheating plug.

[0021] The preheating device 8 is integrally formed with connecting cavity 2.

[0022] The cavity 45 is equipped with external gear 42 and internal gear 43, and one end of the cavity 45 is negative pressure chamber, and the other end is high pressure chamber, external gear 42 and internal gear 43 are continuously rotated and engaged, push oil liquid from negative pressure chamber into high pressure chamber, then flow into shunt passage 48, shunt passage 48 is communicated with first fuel injection pipe 21 upwards, the bottom of the preheating device 8 is close to first fuel injection pipe 21, so that first fuel injection pipe 21 is heated first.

[0023] The bottom of the first fuel injection pipe 21 is communicated with high pressure chamber, so that external gear 42 and internal gear 43 in the cavity 45 are heated synchronously, viscous liquid in the cavity 45 is good in flowability after being melted, and external gear 42 and internal gear 43 are not easily damaged.

[0024] The first oil injection pipe 21 is arranged in the connecting cavity 2, the top of the first oil injection pipe 21 is communicated with the second oil injection pipe 25, and the top of the second oil injection pipe 25 is communicated with the nozzle connecting pipe 1, so that the first oil injection pipe 21, the second oil injection pipe 25 and the nozzle connecting pipe 1 can be heated in sequence.

[0025] The utility model discloses a preheating device of fuel injection pump, fuel injection pump includes nozzle connecting pipe 1, connecting cavity 2, electromagnetic valve 3, pump base 4, the pump base 4 top is connected nozzle connecting pipe 1 through connecting cavity 2, electromagnetic valve 3 is arranged in one side of connecting cavity 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 of cavity 45 is communicated with a liquid inlet channel 46, the output of cavity 45 is communicated with a shunt channel 48, and oil flows into cavity 45 from liquid inlet pipeline 52, and flows into shunt channel 48 through the gear that constantly engages, then flows out from shunt channel 48 in two sections, one section is communicated with electromagnetic valve 3 upwards, and the other section is communicated with second chamber 6 downwards, one side of connecting cavity 2 is equipped with preheating device 8, the bottom of preheating device 8 is equipped with the base of connecting cavity 2, the base of connecting cavity 2 is connected with pump base 4, preheating device 8 is equipped with preheating plug in, be used for preheating before fuel injection pump works, and the viscous liquid in cavity 45 and connecting cavity 2 is thawed, so that the flowability of liquid liquid is good, and easy to start.

[0026] 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, under the premise of not departing from the utility model concept, can make several deformation and improvement, and these all belong to the protection scope of the utility model. Therefore, the protection scope of the utility model patent should be the appended claims.

Claims

1. A preheating device 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 connecting cavity (2) is provided with a preheating device (8) on one side, the bottom of the preheating device (8) is arranged on the base of the connecting cavity (2), the base of the connecting cavity (2) is connected with the pump base (4), the preheating device (8) is provided with a preheating plug for preheating before the operation of the oil injection pump, melting the viscous liquid in the connecting cavity (2) and the cavity (45), so that the liquid has good fluidity and is easy to start.

2. The preheating device of an oil injection pump according to claim 1, characterized in that: The preheating device (8) is a hollow structure for placing the preheating plug.

3. The preheating device of an oil injection pump according to claim 1, wherein: The preheating device (8) is integrally formed with the connecting cavity (2).

4. The preheating device of an oil injection pump according to claim 1, wherein: The cavity (45) is provided with an external gear (42) and an internal gear (43), one end of the cavity (45) is a negative pressure cavity, the other end is a high pressure cavity, the external gear (42) and the internal gear (43) are continuously rotated and engaged, pushing the oil liquid from the negative pressure cavity into the high pressure cavity, and then flowing into the shunt channel (48), the shunt channel (48) is connected with the first oil injection pipe (21) upward, the preheating device (8) is close to the bottom of the first oil injection pipe (21), so that the first oil injection pipe (21) is heated first.

5. The preheating device of an oil injection pump according to claim 4, wherein: The bottom of the first oil injection pipe (21) is connected with the high pressure cavity, so that the external gear (42) and the internal gear (43) in the cavity (45) are heated synchronously, and the viscous liquid in the cavity (45) has good fluidity after being melted, and the external gear (42) and the internal gear (43) are not easy to be damaged.

6. The preheating device of an oil injection pump according to claim 4, wherein: The first oil injection pipe (21) is arranged in the connecting cavity (2), the top of the first oil injection pipe (21) is connected with the second oil injection pipe (25), the top of the second oil injection pipe (25) is connected with the nozzle connecting pipe (1), so that the first oil injection pipe (21), the second oil injection pipe (25) and the nozzle connecting pipe (1) can be heated in turn.

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