阅读说明：本技术 一种排气阀驱动机构及排气阀 (Exhaust valve driving mechanism and exhaust valve ) 是由 王慧珺 杨丽 于 2019-10-12 设计创作，主要内容包括：本发明属于柴油机技术领域,公开了一种排气阀驱动机构及排气阀,驱动机构包括驱动壳体,中部贯穿设有第一通孔,驱动壳体的侧壁设有连通第一通孔的回油孔和第一节流螺塞；外活塞,滑动置于第一通孔内,外活塞开设有通道,外活塞设有与通道连通的油孔和卸油孔,卸油孔能连通于第一节流螺塞；内活塞,滑动置于通道内,且一端能伸出通道的底部；阀杆,固接于内活塞伸出通道的一端,且阀杆上设有复位组件；液压块,固定安装于驱动壳体,液压块开设有第二通孔,第二通孔的一端连通于第一通孔；电磁阀,安装于液压块,且与第二通孔的另一端连通。本发明增压方式简单可靠,使排气阀开启、关闭响应快,且机械撞击部位缓冲效果好。(The invention belongs to the technical field of diesel engines and discloses an exhaust valve driving mechanism and an exhaust valve, wherein the driving mechanism comprises a driving shell, a first through hole penetrates through the middle part of the driving shell, and an oil return hole and a first throttling plug screw which are communicated with the first through hole are formed in the side wall of the driving shell; the outer piston is arranged in the first through hole in a sliding mode, a channel is formed in the outer piston, an oil hole and an oil discharging hole are formed in the outer piston and are communicated with the channel, and the oil discharging hole can be communicated with the first throttling screw plug; the inner piston is arranged in the channel in a sliding mode, and one end of the inner piston can extend out of the bottom of the channel; the valve rod is fixedly connected to one end of the inner piston, which extends out of the channel, and a resetting component is arranged on the valve rod; the hydraulic block is fixedly arranged on the driving shell and provided with a second through hole, and one end of the second through hole is communicated with the first through hole; and the electromagnetic valve is arranged on the hydraulic block and is communicated with the other end of the second through hole. The invention has simple and reliable pressurization mode, makes the opening and closing response of the exhaust valve quick, and has good buffering effect on mechanical impact parts.)

1. An exhaust valve drive mechanism, comprising:

The middle of the driving shell (1) is provided with a first through hole in a penetrating manner, and the side wall of the driving shell (1) is provided with an oil return hole (11) and a first throttling screw plug (12) which are communicated with the first through hole;

the outer piston (2) is arranged in the first through hole in a sliding mode, a channel is formed in the outer piston (2), an oil hole (21) communicated with the channel is formed in the top of the outer piston (2), an oil unloading hole (22) communicated with the channel is formed in the side portion of the outer piston, and the oil unloading hole (22) can be communicated with the first throttling plug screw (12);

The inner piston (3) is arranged in the channel in a sliding mode, and one end of the inner piston can extend out of the bottom of the channel;

The valve rod (4) is fixedly connected to one end, extending out of the channel, of the inner piston (3), and a resetting component (41) is arranged on the valve rod (4);

The hydraulic block (5) is fixedly arranged on the driving shell (1), a second through hole (51) is formed in the hydraulic block (5), and one end of the second through hole (51) is communicated with the first through hole;

And the electromagnetic valve (6) is arranged on the hydraulic block (5) and is communicated with the other end of the second through hole (51).

2. The exhaust valve driving mechanism according to claim 1, wherein a first driving chamber (7) is formed between the second through hole (51) and a portion of the first through hole and a top portion of the outer piston (2), and one end of the oil hole (21) communicates with the first driving chamber (7).

3. The exhaust valve driving mechanism according to claim 2, wherein a second driving chamber (8) is formed between the passage and the top of the inner piston (3), the oil discharge hole (22) is communicable with the second driving chamber (8), and the other end of the oil hole (21) is communicable with the second driving chamber (8).

4. An exhaust valve drive mechanism according to claim 1, characterized in that the top of the outer piston (2) is provided with a second throttle plug (9) communicating with the passage.

5. The exhaust valve driving mechanism according to claim 1, wherein the first through hole comprises a first section (13), a second section (14) and a third section (15) which are communicated in sequence, the diameter of the first section (13) is larger than that of the second section (14) and smaller than that of the third section (15), the outer piston (2) is arranged in the first section (13) in a sliding mode, the end portion of the outer piston can abut against the joint of the first section (13) and the second section (14), and one end of the inner piston (3) can extend into the third section (15) through the second section (14).

6. An exhaust valve drive mechanism according to claim 1, characterized in that the reset assembly (41) is an air spring.

7. An exhaust valve actuating mechanism according to any one of claims 1-6, wherein a sealing member is provided between said reset member (41) and an inner wall of said first through hole.

8. the exhaust valve driving mechanism according to claim 1, wherein one end of the hydraulic block (5) is provided with a boss (52), and the boss (52) is sealingly installed in one end of the first through hole.

9. The exhaust valve driving mechanism according to claim 8, wherein the boss (52) is circumferentially provided with a sealing groove, and a sealing ring (53) is provided between the sealing groove and the inner wall of the first through hole.

10. An exhaust valve comprising the exhaust valve driving mechanism according to any one of claims 1 to 9.

Technical Field

the invention relates to the technical field of diesel engines, in particular to an exhaust valve driving mechanism and an exhaust valve.

Background

The exhaust valve of the diesel engine and the control driving system thereof are one of the core components of the diesel engine, and the driving characteristics thereof directly influence the economy and the emission performance of the engine. Traditional discharge valve system generally includes discharge valve control unit and discharge valve actuating mechanism two parts, and servo oil pressure boost to required driving pressure in discharge valve control unit gets into discharge valve actuating mechanism through high-pressure fuel pipe, drives discharge valve work then, and this kind of mode pressure loss is great, involves that spare part is more and needs the precision matching between two parts mechanism. And the exhaust valve needs to meet the requirements of quick response in the opening and closing processes in work, the buffering effect of all mechanical impact parts is poor in the initial stage and the final stage of the opening and closing processes of the exhaust valve, and parts are easy to damage.

Disclosure of Invention

the invention aims to provide an exhaust valve driving mechanism and an exhaust valve, which have simple and reliable pressurization mode, can make the response of opening and closing the exhaust valve fast, and have good buffering effect on the mechanical impact part of the exhaust valve driving mechanism in the opening and closing processes of the exhaust valve.

in order to achieve the purpose, the invention adopts the following technical scheme:

an exhaust valve drive mechanism comprising:

The middle part of the driving shell is provided with a first through hole in a penetrating manner, and the side wall of the driving shell is provided with an oil return hole and a first throttling screw plug which are communicated with the first through hole;

the outer piston is arranged in the first through hole in a sliding mode, a channel is formed in the outer piston, an oil hole communicated with the channel is formed in the top of the outer piston, an oil unloading hole communicated with the channel is formed in the side of the outer piston, and the oil unloading hole can be communicated with the first throttling plug screw;

The inner piston is arranged in the channel in a sliding mode, and one end of the inner piston can extend out of the bottom of the channel;

The valve rod is fixedly connected to one end, extending out of the channel, of the inner piston, and a reset assembly is arranged on the valve rod;

The hydraulic block is fixedly arranged on the driving shell and provided with a second through hole, and one end of the second through hole is communicated with the first through hole;

And the electromagnetic valve is arranged on the hydraulic block and is communicated with the other end of the second through hole.

preferably, a first driving chamber is formed between the second through hole and a part of the first through hole and the top of the outer piston, and one end of the oil hole is communicated with the first driving chamber.

Preferably, a second driving cavity is formed between the channel and the top of the inner piston, the oil discharge hole can be communicated with the second driving cavity, and the other end of the oil hole is communicated with the second driving cavity.

Preferably, the top of the outer piston is provided with a second throttling screw plug communicated with the channel.

Preferably, the first through hole comprises a first section, a second section and a third section which are sequentially communicated, the diameter of the first section is larger than that of the second section and smaller than that of the third section, the outer piston is arranged in the first section in a sliding mode, the end portion of the outer piston can abut against the joint of the first section and the second section, and one end of the inner piston can extend into the third section through the second section.

Preferably, the reset assembly is an air spring.

Preferably, a sealing member is arranged between the reset component and the inner wall of the first through hole.

Preferably, one end of the hydraulic block is provided with a boss, and the boss is hermetically mounted in one end of the first through hole.

preferably, a sealing groove is formed in the circumferential direction of the boss, and a sealing ring is arranged between the sealing groove and the inner wall of the first through hole.

The invention also provides an exhaust valve, which comprises the exhaust valve driving mechanism.

The invention has the beneficial effects that: through discharge valve actuating mechanism, it can make discharge valve pressurization earlier and then stop the pressure boost, and the pressure boost mode is simple reliable, can make discharge valve open the response fast to servo oil consumption has been saved.

When the exhaust valve is closed, the servo oil in the second driving cavity enters the first driving cavity through the second throttling screw plug, the outer piston moves upwards due to the pressure difference between the two cavities, and the pressure difference between the two cavities is smaller and smaller, so that the ascending speed of the outer piston is lower and lower, and the buffering effect of collision between the outer piston and the driving shell is realized. And the aperture of the second throttling plug screw is adjustable, and oil can be flexibly adjusted.

In addition, when closing discharge valve, the servo oil in the second drive intracavity gets into first drive chamber through second throttle plug screw, and the servo oil in the first drive intracavity is let out through the solenoid valve fast, and the pressure differential between two chambeies is big earlier, and the interior piston is gone upward fastly, has realized that discharge valve closes the response fast. Along with more and more servo oil in the second driving cavity enters the first driving cavity through the second throttling screw plug, the pressure difference between the two cavities is reduced, the ascending speed of the inner piston is reduced and is slowed down, and the buffering effect of collision between the inner piston and the outer piston is realized.

Drawings

FIG. 1 is a schematic view of the exhaust valve actuating mechanism of the present invention prior to opening of the exhaust valve;

FIG. 2 is an enlarged schematic view taken at A of FIG. 1 in accordance with the present invention;

FIG. 3 is a schematic view of the exhaust valve actuating mechanism of the present invention after the exhaust valve is opened;

FIG. 4 is an enlarged schematic view of the invention at B of FIG. 3;

fig. 5 is a schematic view showing the state of the exhaust valve driving mechanism of the present invention when the exhaust valve is closed.

in the figure:

1. a drive housing; 11. an oil return hole; 12. a first throttle plug screw; 13. a first stage; 14. a second stage; 15. a third stage; 2. an outer piston; 21. an oil hole; 22. an oil discharge hole; 3. an inner piston; 4. a valve stem; 41. a reset assembly; 5. a hydraulic block; 51. a second through hole; 52. a boss; 53. a seal ring; 6. an electromagnetic valve; 7. a first drive chamber; 8. a second drive chamber; 9. and a second throttling screw plug.

Detailed Description

The present invention will be described in further detail with reference to the accompanying drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting of the invention. It should be further noted that, for the convenience of description, only some of the structures related to the present invention are shown in the drawings, not all of the structures.

In the description of the present invention, unless expressly stated or limited otherwise, the terms "connected," "connected," and "fixed" are to be construed broadly, e.g., as meaning permanently connected, removably connected, or integral to one another; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.

in the present invention, unless otherwise expressly stated or limited, "above" or "below" a first feature means that the first and second features are in direct contact, or that the first and second features are not in direct contact but are in contact with each other via another feature therebetween. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly under and obliquely below the second feature, or simply meaning that the first feature is at a lesser elevation than the second feature.

in the description of the present embodiment, the terms "upper", "lower", "right", etc. are used in an orientation or positional relationship based on that shown in the drawings only for convenience of description and simplicity of operation, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first" and "second" are used only for descriptive purposes and are not intended to have a special meaning.

The invention provides an exhaust valve driving mechanism which is arranged on an exhaust valve, wherein the exhaust valve comprises a valve rod and a valve shell, and the exhaust valve driving mechanism can realize the opening and closing of the exhaust valve and can improve the response speed of the opening and closing of the exhaust valve. In addition, the exhaust valve driving mechanism of the present embodiment can cushion the mechanical impact portion of the exhaust valve during the opening and closing of the exhaust valve, thereby improving the reliability of the entire exhaust valve driving mechanism.

As shown in fig. 1 to 5, the exhaust valve driving mechanism in the present embodiment includes a driving housing 1, an outer piston 2, an inner piston 3, a valve stem 4, a hydraulic block 5, and a solenoid valve 6, wherein:

The driving housing 1 may be a cylindrical structure, a first through hole is formed through a middle position of the driving housing, the first through hole may be as shown in fig. 1, and includes a first section 13, a second section 14, and a third section 15 that are sequentially communicated, and preferably, a diameter of the first section 13 is greater than a diameter of the second section 14 and smaller than a diameter of the third section 15, the outer piston 2 is slidably disposed in the first section 13, an end portion of the outer piston can abut against a connection portion (i.e., a step end surface) of the first section 13 and the second section 14, one end of the inner piston 3 can extend into the third section 15 through the second section 14, and a portion of the valve rod 4 can be disposed in the third section 15.

An oil return hole 11 is opened on the side wall of the driving housing 1, and the oil return hole 11 is communicated with the first through hole, and preferably communicated with the lower end of the first section 13. A first orifice screw 12 is further mounted on the side wall of the drive housing 1, and the first orifice screw 12 is used for passing the servo oil and can adjust the flow rate of the passing servo oil as required.

The outer piston 2 is slidably disposed in the first section 13 of the first through hole, and the outer wall of the outer piston is in sliding fit with the inner wall of the first section 13. Referring to fig. 2 and 4, a passage is opened at a middle position of the outer piston 2, and a lower end of the passage is opened. A plurality of oil holes 21 communicated with the channel are opened at the top of the outer piston 2, an oil discharge hole 22 communicated with the channel is opened at the side part of the outer piston 2, and when the outer piston 2 slides to abut against the joint of the first section 13 and the second section 14, the oil discharge hole 22 is communicated with the first throttling screw plug 12.

Preferably, the second throttling screw plug 9 is further installed at the top center position of the outer piston 2, and the second throttling screw plug 9 is communicated with the upper end of the passage. The second orifice screw 9 enables the servo oil in the passage to flow into the first stage 13 and the servo oil in the first stage 13 to flow into the passage. And the oil inlet amount can be flexibly adjusted by adjusting the aperture of the second throttling screw plug 9.

The inner piston 3 is slidably disposed in the channel through the opening of the channel, and the lower end of the inner piston 3 can extend out of the bottom of the channel through the opening.

the valve rod 4 is a valve rod of the exhaust valve and is used for realizing the opening and closing of the exhaust valve. One end of the valve rod 4 is fixedly connected to the lower end of the inner piston 3 and can move synchronously with the inner piston 3. The valve rod 4 is provided with a returning member 41, and the returning member 41 can return the valve rod 4. Preferably, in this embodiment, the reset assembly 41 may be an air spring, the air spring is slidably attached to the inner wall of the third segment 15, and a sealing member is disposed between the air spring and the inner wall of the third segment 15, and the sealing member can slidably seal the air spring and the third segment 15 when the air spring slides relative to the third segment 15. In this embodiment, the seal may be an O-ring seal.

Referring to fig. 1, the hydraulic block 5 is fixedly mounted on the top of the driving housing 1, and a second through hole 51 is formed in the hydraulic block 5, one end of the second through hole 51 is communicated with the first through hole, and the other end is communicated with the solenoid valve 6. Alternatively, the second through hole 51 of the present embodiment may be an L-shaped through hole.

As shown in fig. 4, one end of the hydraulic block 5 is provided with a boss 52, and the boss 52 is hermetically installed in one end of the first through hole, specifically, extends into the upper end of the first section 13. A seal groove is formed in the boss 52 in the circumferential direction, and a seal ring 53 is provided between the seal groove and the inner wall of the first stage 13.

in this embodiment, the first driving chamber 7 is formed between the second through hole 51 and a part of the first section 13 and the top of the outer piston 2, and the servo oil can enter the second through hole 51 and enter the first driving chamber 7 through the solenoid valve 6. One end of the oil hole 21 communicates with the first drive chamber 7.

A second driving cavity 8 is formed between the channel and the top of the inner piston 3, the other end of the oil hole 21 is communicated with the second driving cavity 8, the servo oil in the first driving cavity 7 can enter the second driving cavity 8 through the oil hole 21 and the second throttling screw plug 9, and it can be understood that the servo oil in the second driving cavity 8 can also enter the first driving cavity 7 through the oil hole 21 and the second throttling screw plug 9. The oil discharge hole 22 can be communicated with the second driving cavity 8, specifically, when the outer piston 2 slides to a joint abutting against the first section 13 and the second section 14, and the inner piston 3 slides downwards relative to the outer piston 2 for a certain distance, the oil discharge hole 22 can be opened, the oil discharge hole 22 is communicated with the second driving cavity 8 and the first throttling plug screw 12, and at the moment, the servo oil in the first driving cavity 7 and the second driving cavity 8 can flow to external equipment through the oil discharge hole 22 and the first throttling plug screw 12.

the principle of the exhaust valve driving mechanism of the present invention is as follows:

when the exhaust valve is just opened, as shown in fig. 1, the solenoid valve 6 controls servo oil to enter the first drive chamber 7 through the second through hole 51, the servo oil pushes the outer piston 2 to move downward, the outer piston 2 pushes the inner piston 3 to move downward, the inner piston 3 and the outer piston 2 synchronously move downward at the moment, relative sliding does not occur between the inner piston and the outer piston, the inner piston 3 pushes the valve rod 4 to move downward, the exhaust valve is opened, and residual and leaked servo oil passes through the oil return hole 11 and flows to external equipment.

At the later stage of opening of the exhaust valve, as shown in fig. 3, the outer piston 2 reaches a mechanical limit (i.e., abuts against the joint of the first section 13 and the second section 14), at this time, the servo oil in the first driving cavity 7 enters the second driving cavity 8 through the oil hole 21 and the second throttle plug 9, the servo oil in the second driving cavity 8 pushes the inner piston 3 to move downward, the oil drain hole 22 is opened after the inner piston 3 moves downward for a certain distance, the oil drain hole 22 is communicated with the first throttle plug 12, the servo oil in the first driving cavity 7 and the second driving cavity 8 goes to an external device through the oil drain hole 22 and the first throttle plug 12, meanwhile, the pressure in the first driving cavity 7 and the second driving cavity 8 slightly drops, and the movement of the exhaust valve stops and is kept stable, i.e., the exhaust valve is in a stable opening state. The reset assembly 41 is now in a power state ready for resetting the valve stem 4.

When the exhaust valve is closed, as shown in fig. 5, an oil return port of the electromagnetic valve 6 is opened, the servo oil in the first driving cavity 7 and the second driving cavity 8 goes to the outside through the electromagnetic valve 6, the pressure in the first driving cavity 7 and the second driving cavity 8 is reduced, the valve rod 4 drives the inner piston 3 to move upwards under the action of the reset assembly 41, the volume of the second driving cavity 8 is reduced, the pressure is increased, meanwhile, the servo oil in the second driving cavity 8 goes to the first driving cavity 7 through the oil hole 21 and the second throttling screw plug 9, and when the pressure in the second driving cavity 8 is greater than the pressure in the first driving cavity 7, the servo oil drives the outer piston 2 to move upwards until the exhaust valve is closed.

According to the exhaust valve driving mechanism, the driving area of the outer piston 2 is larger than that of the inner piston 3, the exhaust valve is opened without pressurization after pressurization, the later driving force of the exhaust valve is smaller than that in the earlier stage, the exhaust valve is opened quickly, and the servo oil consumption is saved.

after the inner piston 3 descends for a certain distance, the oil drainage hole 22 is opened and communicated with the first throttling screw plug 12, and at the moment, the exhaust valve is opened to a fixed opening degree and is in a stable opening state. The stroke opening of the exhaust valve can be controlled by controlling the distance between the upper surface of the inner piston 3 and the oil drainage hole 22, so that the stroke opening of the exhaust valve can be flexibly adjusted.

When the exhaust valve is closed, the servo oil in the second driving cavity 8 enters the first driving cavity 7 through the second throttling screw plug 9, the outer piston 2 moves upwards due to the pressure difference between the two cavities, and the pressure difference between the two cavities is smaller and smaller, so that the ascending speed of the outer piston 2 is lower and lower, and the collision buffering effect between the outer piston 2 and the driving shell 1 is realized. The aperture of the second throttling screw plug 9 is adjustable, and the smaller the aperture of the second throttling screw plug 9 is, the better the buffering effect is. And the aperture size of above-mentioned second throttle plug screw 9 is adjustable, and the servo oil flow that the steerable enters into second drive chamber 8 from first drive chamber 7 can flexibly adjust the oil feed.

when the exhaust valve is closed, the servo oil in the second driving cavity 8 enters the first driving cavity 7 through the second throttling screw plug 9, the servo oil in the first driving cavity 7 is quickly discharged through the electromagnetic valve 6, the pressure difference between the two cavities is large at the early stage, the ascending speed of the inner piston 3 is high, and the exhaust valve is closed quickly. After more and more servo oil in the second driving cavity 8 enters the first driving cavity 7 through the second throttling screw plug 9, the pressure difference between the two cavities is reduced, the ascending speed of the inner piston 3 is reduced and is reduced, and the collision buffering effect between the inner piston 3 and the outer piston 2 is realized.

The invention also provides the exhaust valve, which comprises the exhaust valve driving mechanism, and the exhaust valve can be quickly opened and closed through the exhaust valve driving mechanism, so that the consumption of servo oil is reduced.

It should be understood that the above-described embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. Numerous obvious variations, adaptations and substitutions will occur to those skilled in the art without departing from the scope of the invention. And are neither required nor exhaustive of all embodiments. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present invention should be included in the protection scope of the claims of the present invention.