CN213392630U

CN213392630U - High-pressure pump

Info

Publication number: CN213392630U
Application number: CN202021487383.7U
Authority: CN
Inventors: 刘亮亮; 张满意
Original assignee: United Automotive Electronic Systems Co Ltd
Current assignee: United Automotive Electronic Systems Co Ltd
Priority date: 2020-07-24
Filing date: 2020-07-24
Publication date: 2021-06-08
Anticipated expiration: 2030-07-24

Abstract

The utility model provides a high-pressure pump, which comprises a pump body and a plunger piston; the pump body has the plunger chamber, the plunger chamber is including first passageway and the second passageway that is linked together, the second passageway has low pressure fluid inflow mouth and high pressure fluid egress opening, the plunger is configured to, follows reciprocating motion is made to the first passageway, in order to increase the follow low pressure fluid inflow mouth flows in and follows the oil pressure of the fluid of high pressure fluid egress opening outflow, wherein, the plunger is close to the terminal surface of second passageway has the cavity. Through being close to at the plunger the terminal surface of second passageway sets up the cavity for the effective volume in plunger chamber has been increased, and then in each reciprocating motion's of plunger cycle, makes the volume of the fluid of being inhaled in the plunger chamber increase to some extent, so just solved under the prerequisite that does not change the plunger stroke, how to increase the problem of the volume of fluid in the plunger chamber.

Description

High-pressure pump

Technical Field

The utility model relates to a pump body technical field, in particular to high-pressure pump.

Background

The high-pressure pump is a key part of a fuel direct injection engine, and converts input low-pressure fuel into high-pressure fuel to be supplied to a high-pressure end (150bar or more) through reciprocating linear motion of a driving plunger.

In the prior art, as shown in fig. 1, a high pressure pump is mainly composed of a pump body 100 and a plunger 200, the pump body 100 has a plunger cavity 110, the plunger cavity 110 includes a first passage 111 and a second passage 112 communicated with each other, and the second passage 112 has a low pressure oil inlet 112a and a high pressure oil outlet 112 b. When the high pressure pump is operated, the plunger 200 reciprocates along the first passage 111 to increase the oil pressure of the oil flowing in from the low pressure oil inflow port 112a and flowing out from the high pressure oil outflow port 112 b. Specifically, when the plunger 200 moves in a direction away from the second passage 112, oil is drawn into the plunger chamber 110 from the low-pressure oil inlet 112 a; when the plunger 200 moves in a direction close to the second passage 112, since the volume of the plunger chamber 110 is compressed and reduced with the movement of the plunger 200, the low-pressure oil in the plunger chamber 110 is compressed, and the compressed high-pressure oil is output through the high-pressure oil outlet 112 b; the plunger 200 reciprocates in such a manner that the oil is continuously input from the low-pressure oil inlet 112a, and the oil is output from the high-pressure oil outlet 112b after the oil pressure is increased, thereby realizing the conversion of the oil from the low pressure to the high pressure.

With the rapid development of economy, people have higher and higher requirements on the power of automobile engines, so that automobiles carrying large-displacement engines are increased gradually. The high-pressure oil pump also has higher design requirements, and the plunger of the oil pump is required to supply more oil flow to the engine per stroke or improve the oil supply efficiency of the existing high-pressure oil pump so as to realize that the high-pressure oil pump outputs more high-pressure oil to the engine to generate energy by combustion.

At present, for the high-displacement requirement of an engine, the adopted scheme mainly comprises the following steps:

1. increasing the plunger lift of the high-pressure oil pump;

2. using a double high-pressure pump oil supply system;

3. the plunger clearance of the high-pressure oil pump is reduced, the internal leakage is reduced, and the oil supply efficiency is improved;

4. the plunger diameter is increased.

Among them, the scheme 1 may cause the increase of the weight of the oil pump due to the increase of the height size of the high-pressure oil pump; scheme 2 presents greater challenges to the overall design and software control of the engine; in the scheme 3, the processing precision of the plunger and the matching hole of the plunger needs to be further improved under the micron-sized condition, and a new material or a surface treatment process needs to be used, so that the cost is increased, and the risk of blocking of the plunger in the up-and-down reciprocating motion process is increased; scheme 4 increases the load of the driving system due to the fact that the load bearing area of the plunger and the high-pressure oil is increased, and provides a greater challenge to the strength of the existing driving system.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a high-pressure pump to solve under the prerequisite that does not change the plunger stroke, how to increase the problem of the volume of fluid in the plunger chamber.

In order to solve the technical problem, the utility model provides a high-pressure pump, which comprises a pump body and a plunger; the pump body has the plunger chamber, the plunger chamber is including first passageway and the second passageway that is linked together, the second passageway has low pressure fluid inflow mouth and high pressure fluid egress opening, the plunger is configured to, follows reciprocating motion is made to the first passageway, in order to increase the follow low pressure fluid inflow mouth flows in and follows the oil pressure of the fluid of high pressure fluid egress opening outflow, wherein, the plunger is close to the terminal surface of second passageway has the cavity.

Optionally, in the high pressure pump, at least the cavity of the plunger is located in the second passage when the plunger moves to an extreme position in a direction close to the second passage.

Optionally, in the high pressure pump, when the plunger moves to an extreme position in a direction close to the second passage, the bottom end of the cavity is flush with the joint between the first passage and the second passage.

Optionally, in the high-pressure pump, the plunger further has a flow channel, the flow channel penetrates at least a side wall of one end of the plunger near the high-pressure oil outlet and is communicated with the cavity.

Alternatively, in the high pressure pump, the circulation groove penetrates the plunger in a direction from the low pressure oil inlet to the high pressure oil outlet, and communicates with the cavity.

Alternatively, in the high-pressure pump, the flow groove may have a depth gradually increasing or stepwise increasing from an end near the low-pressure oil inflow port to an end near the high-pressure oil outflow port.

Alternatively, in the high pressure pump, a bottom of the flow groove is not higher than a bottom of the cavity, and the flow groove is located in the second passage when the plunger moves to an extreme position in a direction to approach the second passage.

Optionally, in the high-pressure pump, when the plunger moves to an extreme position in a direction close to the second passage, a bottom of an end of the flow groove close to the high-pressure oil outlet is flush with a junction between the first passage and the second passage.

The utility model provides a high-pressure pump, which comprises a pump body and a plunger piston; the pump body has the plunger chamber, the plunger chamber is including first passageway and the second passageway that is linked together, the second passageway has low pressure fluid inflow mouth and high pressure fluid egress opening, the plunger is configured to, follows reciprocating motion is made to the first passageway, in order to increase the follow low pressure fluid inflow mouth flows in and follows the oil pressure of the fluid of high pressure fluid egress opening outflow, wherein, the plunger is close to the terminal surface of second passageway has the cavity. Through being close to at the plunger a terminal surface of second passageway sets up the cavity for the effective volume in plunger chamber has been increased, and then in each reciprocating motion's of plunger cycle, makes the volume of the fluid of being inhaled in the plunger chamber increase to some extent, through the setting of cavity on the plunger promptly, makes the plunger chamber can hold more fluid, so just solved under the prerequisite that does not change the plunger stroke, how to increase the problem of the volume of fluid in the plunger chamber.

Drawings

FIG. 1 is a schematic diagram of a high pressure pump in the prior art;

fig. 2 is a schematic structural diagram of a high-pressure pump with a cavity in a plunger according to the embodiment;

fig. 3 is a schematic structural view of the high-pressure pump according to the present embodiment, in which the plunger is moved to the extreme position in a direction close to the second passage;

FIG. 4 is a schematic axial cross-sectional view of a plunger having a cavity according to this embodiment;

FIG. 5 is a schematic cross-sectional view of the plunger with a cavity provided in the present embodiment in a radial direction;

fig. 6 is a schematic structural view of a high-pressure pump provided with a plunger having a flow channel according to the present embodiment;

FIG. 7 is a schematic structural view of a high pressure pump provided with a plunger having another flow channel according to the present embodiment;

fig. 8 is a schematic structural view of a high-pressure pump provided with a plunger having a third type of flow channel according to the present embodiment;

FIG. 9 is a schematic cross-sectional view of the plunger with flow channel provided in this embodiment in a radial direction;

fig. 10 is a schematic structural view of the high-pressure pump with a seal ring according to the present embodiment;

FIG. 11 is a schematic structural diagram of a high-pressure pump with an oil inlet and outlet pipeline and a valve according to the present embodiment;

wherein the reference numerals are as follows:

100-a pump body; 110-a plunger cavity; 111-a first channel; 112-a second channel; 112 a-a low pressure oil stream inlet; 112 b-a high pressure oil outflow; 200-a plunger; 210-a cavity; 220-a flow-through tank; 300-sealing ring; 410-an oil inlet pipe; 411-an oil inlet valve; 420-an oil outlet pipeline; 421-oil outlet valve.

Detailed Description

The high-pressure pump according to the present invention will be described in further detail with reference to the accompanying drawings and specific embodiments. It should be noted that the drawings are in simplified form and are not to precise scale, and are provided for convenience and clarity in order to facilitate the description of the embodiments of the present invention. Further, the structures illustrated in the drawings are often part of actual structures. In particular, the drawings may have different emphasis points and may sometimes be scaled differently.

The present embodiment provides a high pressure pump, as shown in fig. 2, which includes a pump body 100 and a plunger 200; the pump body 100 has a plunger chamber 110, the plunger chamber 110 includes a first passage 111 and a second passage 112 communicating with each other, the second passage 112 has a low-pressure oil inflow port 112a and a high-pressure oil outflow port 112b, and the plunger 200 is configured to reciprocate along the first passage 111 to increase the oil pressure of oil flowing in from the low-pressure oil inflow port 112a and flowing out from the high-pressure oil outflow port 112b, wherein a cavity 210 is formed at an end surface of the plunger 200 near the second passage 112.

According to the high-pressure pump provided by the embodiment, the concave cavity 210 is arranged on one end face of the plunger 200, which is close to the second passage 112, so that the effective volume of the plunger cavity 110 is increased, and further, in each reciprocating motion period of the plunger 200, the volume of oil sucked into the plunger cavity 110 is increased, namely, the plunger cavity 110 can contain more oil through the arrangement of the concave cavity 210 on the plunger 200, so that the problem of how to increase the volume of the oil in the plunger cavity 110 on the premise of not changing the stroke of the plunger 200 is solved.

Further, in the high pressure pump provided in this embodiment, when the plunger 200 moves to the limit position in the direction close to the second passage 112, at least the cavity 210 of the plunger 200 is located in the second passage 112. As a result, when the plunger 200 moves to the limit position in a direction close to the second passage 112, the oil in the cavity 210 can be smoothly output from the high-pressure oil outlet 112 b.

Preferably, as shown in fig. 3, when the plunger 200 moves to the limit position in the direction close to the second channel 112, the bottom end of the cavity 210 is flush with the junction between the first channel 111 and the second channel 112. Since the bottom end of the cavity 210 is flush with the junction between the first passage 111 and the second passage 112, the oil in the cavity 210 can be smoothly discharged from the high-pressure oil outlet port 112b, and the volume of the cavity 210, and thus the effective volume of the plunger chamber 110, can be maximized.

The cavity 210 may have a variety of designs.

For example, fig. 4 is a schematic axial cross-section of the plunger 200, showing five different designs of the cavity 210: the diameter of the cavity 210 in the scheme 1 is consistent with that of the plunger 200, and the cross section along the axial direction of the plunger 200 is arc-shaped; the cavity 210 of the embodiment 2 is different from the embodiment 1 in that the diameter of the cavity is smaller than that of the plunger 200, and the cavity 210 of the embodiment 2 is located at the center of the top of the plunger 200; the cavity 210 of the embodiment 3 is formed by a plurality of small cavities, and each small cavity has an arc-shaped cross section along the axial direction of the plunger 200; the cavity 210 of the embodiment 4 has a square cross section along the axial direction of the plunger 200, and has a deep depth; the cavity 210 of the embodiment 5 has a shallow depth, although it has a square cross section in the axial direction of the plunger 200. In other embodiments, when the cross-section of the cavity 210 is square, a chamfer or fillet may be added to avoid oil accumulation at the corners of the cavity 210.

For another example, fig. 5 is a schematic cross-sectional view of the plunger 200 along the radial direction, and a schematic design scheme that the cross-section of the cavity 210 along the radial direction of the plunger 200 is circular, square, annular and cross-shaped is shown from left to right. When the cross section of the cavity 210 along the radial direction of the plunger 200 is circular or square, the diameter and depth of the cavity 210 can be varied to form different sizes of the cavity 210, and even the area of the cavity 210 on the top of the plunger 200 can be varied and is not limited to the central position; when the cross section of the cavity 210 along the radial direction of the plunger 200 is annular, the width, number, depth, interval, etc. of the annular shape may have different designs; when the cross-section of the cavity 210 along the radial direction of the plunger 200 is cross-shaped, the width, depth, offset position, etc. of the cross-shape may have different designs, and even the well-shaped cavity 210 may be formed.

As can be seen by those skilled in the art from the above examples regarding the cavity 210, the design of the cavity 210 is varied. In practice, there are still more other possibilities for the design of the cavity 210. The cross-sectional shape, the maximum diameter, the number of components, the arrangement mode, the recess depth and the like of the concave cavity 210 can be set according to actual requirements.

It should be noted that other types of cavity designs are also within the scope of the present invention without departing from the spirit of the present invention.

Further, in the high-pressure pump according to the present embodiment, as shown in fig. 6, the plunger 200 further has a flow channel 220, and the flow channel 220 penetrates at least a side wall of the plunger 200 near one end of the high-pressure oil outlet 112b and communicates with the cavity 210.

Since the oil flows out from the high-pressure oil outlet 112b, the oil in the cavity 210 can smoothly flow out to the high-pressure oil outlet 112b through the circulation groove 220 by opening the circulation groove 220 on the side wall near the end of the plunger 200 near the high-pressure oil outlet 112b and communicating the circulation groove 220 with the cavity 210, so that the oil can be prevented from accumulating in the cavity 210, and the compression efficiency of the oil in the plunger chamber 110 can be improved through the circulation groove 220.

Of course, the circulation groove 220 may penetrate the plunger 200 in a direction from the low-pressure oil inlet 112a to the high-pressure oil outlet 112b, and communicate with the cavity 210. As shown in fig. 7, the circulation grooves 220 penetrate both ends of the plunger 200, so that the circulation of the oil in the plunger chamber 110 is more efficient, and the efficiency of the oil flow in the cavity 210 can be increased.

The circulation grooves 220 may be formed in different numbers in other directions, in addition to penetrating the plunger 200 in the direction from the low-pressure oil inlet 112a to the high-pressure oil outlet 112b, so as to further improve the compression efficiency of the oil in the cavity 210.

Preferably, as shown in fig. 8, in order to enable the oil to be discharged from the cavity 210 to the high-pressure oil outlet 112b through the circulation groove 220 more smoothly, the depth of the circulation groove 220 may be gradually increased or stepped from an end near the low-pressure oil inlet 112a to an end near the high-pressure oil outlet 112 b.

The flow channel 220 has a bottom that is no higher than the bottom of the cavity 210 and the flow channel 220 is located in the second passage 112 when the plunger 200 is moved to an extreme position in a direction approaching the second passage 112. As shown in fig. 6 or 8, since the bottom of the circulation groove 220 is not higher than the bottom of the cavity 210, all the oil possibly remaining in the cavity 210 can flow into the circulation groove 220 and flow out through the circulation groove 220; since the circulation groove 220 is located in the second passage 112 when the plunger 220 moves to the limit position in a direction close to the second passage 112, the oil in the circulation groove 220 can be smoothly discharged without being blocked by the inner wall of the plunger chamber 100.

Preferably, with continued reference to fig. 6 or 8, when the plunger 200 moves to the limit position in the direction close to the second passage 112, the bottom of the end of the flow groove 220 close to the high-pressure oil outflow port 112b is flush with the junction between the first passage 111 and the second passage 112. As a result, not only the effective volume of the plunger chamber 110 is maximized by the cavity 210, but also the oil in the cavity 210 can be smoothly discharged from the high-pressure oil outlet 112b through the communication groove 220, thereby preventing the accumulation of the oil in the cavity 210.

The flow channel 220 can also have various designs.

For example, fig. 9 is a schematic axial cross-section of the plunger 200, showing three different flow channel 220 designs: the circulation groove 220 of the embodiment 1 penetrates the plunger 200 in a direction from the low-pressure oil inflow port 112a to the high-pressure oil outflow port 112b, and communicates with the cavity 210; the difference between the circulation groove 220 of the embodiment 2 and the embodiment 1 is that the width of the circulation groove 220 of the embodiment 2 is wider, so that the oil accumulated in the cavity 210 can be discharged more quickly; the circulation groove 220 of the embodiment 3 is formed by adding a circulation groove to the embodiment 1, so that the oil in the plunger chamber 110 flows more efficiently.

Similar to the design of the cavity 210, the design of the flow-through channel 220 is varied, as can be seen by the person skilled in the art from the above examples relating to flow-through channels 220. In practical applications, there are still more other possibilities for designing the flow-through grooves 220, and the cross-sectional shape, size, number of components, arrangement, recess depth, etc. of the flow-through grooves 220 can be set according to practical requirements. For example, the flow channel 220 may have various shapes such as a square shape and an arc shape in a cross section of the plunger 200 in the axial direction, and when the plunger 200 has a plurality of flow channels 220, the shapes of the flow channels may be different from each other.

It should be noted that other types of flow channel designs are also within the scope of the present invention without departing from the spirit of the present invention.

In addition, in the high-pressure pump provided in the present embodiment, as shown in fig. 10, the high-pressure pump further includes a seal ring 300, and the seal ring 300 is disposed on an inner wall of the first passage 111 along a circumferential direction of the first passage 111 and is connected to the plunger 200. The gap between the first channel 111 and the plunger 200 is filled by the sealing ring 300, so that when the plunger 200 reciprocates, oil leakage between the first channel 111 and the plunger 200 can be avoided, and the risk of jamming of the plunger 200 in the reciprocating process can be avoided. In addition, due to the fact that the sealing ring 300 has certain elasticity, matching accuracy of the plunger 200 and the first channel 111 is not too strict, machining is simple, and machining cost caused by machining accuracy is reduced.

In order to make the oil smoothly flow into the plunger chamber 110 and flow out after being compressed in the plunger chamber 110, as shown in fig. 11, the high-pressure pump is further provided with an oil inlet pipe 410, an oil outlet pipe 420, an oil inlet valve 411 and an oil outlet valve 421; the oil inlet pipe 410 is connected to the low-pressure oil inflow port 112a, and the oil outlet pipe 420 is connected to the high-pressure oil outflow port 112 b; the oil inlet valve 411 and the oil outlet valve 421 both have an open state and a closed state, the oil inlet valve 411 and the oil outlet valve 421 are configured to respectively control the on/off of the oil inlet pipeline 410 and the oil outlet pipeline 420, when the plunger 200 moves in a direction away from the second passage 112, the oil inlet valve 411 is opened, and the oil outlet valve 421 is closed; when the plunger 200 moves in a direction to approach the second passage 112, the oil inlet valve 411 is closed, and the oil outlet valve 421 is opened.

Specifically, during the operation of the high-pressure pump, firstly, the oil inlet valve 411 is opened, the oil outlet valve 421 is closed, and the plunger 200 moves in the direction away from the second passage 112, so that oil is sucked into the plunger cavity 110 from the oil inlet pipe 410, and the oil at this time is low-pressure oil; then, when the plunger 200 moves down to the limit position, the oil amount in the plunger chamber 110 is the maximum oil amount, at this time, the oil inlet valve 411 is closed, and the plunger 200 starts to move in a direction close to the second passage 112; during the movement of the plunger 200 toward the second passage 112, the oil in the plunger cavity 110 is continuously compressed and changes to high-pressure oil; then, when the plunger 200 moves upward to the extreme position, the oil pressure is completely compressed into high-pressure oil, the oil inlet valve 411 is kept closed, and the oil outlet valve 421 is opened, so that the high-pressure oil is output from the oil outlet pipeline 420; thus, the oil inlet valve 411 and the oil outlet valve 421 are opened or closed in cooperation with the reciprocating motion of the plunger 200, so that low-pressure oil input into the plunger cavity 110 is continuously converted into high-pressure oil.

In summary, the high pressure pump provided by the embodiment includes a pump body and a plunger; the pump body has the plunger chamber, the plunger chamber is including first passageway and the second passageway that is linked together, the second passageway has low pressure fluid inflow mouth and high pressure fluid egress opening, the plunger is configured to, follows reciprocating motion is made to the first passageway, in order to increase the follow low pressure fluid inflow mouth flows in and follows the oil pressure of the fluid of high pressure fluid egress opening outflow, wherein, the plunger is close to the terminal surface of second passageway has the cavity. Through being close to at the plunger a terminal surface of second passageway sets up the cavity for the effective volume in plunger chamber has been increased, and then in each reciprocating motion's of plunger cycle, makes the volume of the fluid of being inhaled in the plunger chamber increase to some extent, through the setting of cavity on the plunger promptly, makes the plunger chamber can hold more low pressure oil pressures, so just solved under the prerequisite that does not change the plunger stroke, how to increase the problem of the volume of fluid in the plunger chamber.

The above description is only for the preferred embodiment of the present invention and is not intended to limit the scope of the present invention, and any modification and modification made by those skilled in the art according to the above disclosure are all within the scope of the claims.

Claims

1. A high pressure pump, comprising a pump body and a plunger; the pump body has the plunger chamber, the plunger chamber is including first passageway and the second passageway that is linked together, the second passageway has low pressure fluid inflow mouth and high pressure fluid egress opening, the plunger is configured to, follows reciprocating motion is made to the first passageway, in order to increase the follow low pressure fluid inflow mouth flows in and follows the oil pressure of the fluid of high pressure fluid egress opening outflow, wherein, the plunger is close to the terminal surface of second passageway has the cavity.

2. The high pressure pump of claim 1, wherein at least the cavity of the plunger is located within the second passage when the plunger is moved to an extreme position in a direction proximate the second passage.

3. The high pressure pump of claim 2, wherein the bottom end of the cavity is flush with the junction of the first passage and the second passage when the plunger moves in a direction approaching the second passage to an extreme position.

4. The high pressure pump of claim 1, wherein the plunger further includes a flow channel extending through at least a sidewall of the plunger adjacent the high pressure oil flow outlet and communicating with the cavity.

5. The high pressure pump of claim 4, wherein the flow channel extends through the plunger in a direction from the low pressure oil inlet to the high pressure oil outlet and communicates with the cavity.

6. The high pressure pump of claim 4, wherein the flow channel increases in depth gradually or in a stepwise manner from an end proximate the low pressure oil inlet to an end proximate the high pressure oil outlet.

7. The high pressure pump of claim 4, wherein the flow groove has a bottom that is no higher than a bottom of the cavity and is located within the second passage when the plunger moves to an extreme position in a direction proximate the second passage.

8. The high pressure pump according to claim 7, wherein a bottom portion of an end of said flow groove near said high pressure oil outflow port is flush with a junction between said first passage and said second passage when said plunger moves to an extreme position in a direction near said second passage.