CN210003387U

CN210003387U - air inlet bypass system and gas engine

Info

Publication number: CN210003387U
Application number: CN201920427629.2U
Authority: CN
Inventors: 尹晓军; 王波; 李云华; 孙丹; 李志杰
Original assignee: Weichai Power Co Ltd
Current assignee: Weichai Power Co Ltd
Priority date: 2019-03-29
Filing date: 2019-03-29
Publication date: 2020-01-31
Anticipated expiration: 2029-03-29

Abstract

The utility model discloses an kind of gas inlet bypass system and kind of gas engine, gas inlet bypass system includes inlet bypass pipeline and inlet bypass valve, the inlet bypass valve sets up inside the inlet pipeline between compressor and throttle , the end of inlet bypass pipeline is connected in inlet bypass valve and end intercommunication in compressor front line in addition, the inlet bypass valve includes aperture adjustment mechanism and along inlet pipeline axial extension and both ends open-ended inner tube, inner tube and inlet pipeline all correspond and are provided with the opening, when the engine operating mode is in the low-load region, the throttle loss of throttle can be reduced in inlet bypass system's application, be favorable to the improvement of economic nature, when the engine is in the acceleration phase, through closing the inlet bypass valve in advance, throttle maintains great aperture this moment, the response delay of acceleration process throttle has been reduced, improve the transient response nature responsiveness of engine, in addition, the flexible regulation of valve aperture can be realized through the phase cooperation of inner tube with the inlet pipeline to the inlet bypass valve.

Description

air inlet bypass system and gas engine

Technical Field

The utility model relates to a gas engine technical field especially relates to kinds of bypass system and kinds of gas engine that admit air.

Background

With the rapid development of modern industry, the automobile industry becomes the backbone industry for promoting economic development, but simultaneously the automobile industry also consumes a large amount of non-renewable energy, and the emission of automobile pollutants also makes the environmental pollution problem more and more severe.

() the load working condition of the natural gas engine is mainly controlled by a throttle valve , the air-fuel mixture amount entering the cylinder is adjusted by changing the opening degree of the throttle valve to meet different load requirements, along with the reduction of the load, the opening degree of the throttle valve is reduced, the pressure loss before and after the throttle valve is increased, the pumping loss is increased, the air inlet throttling loss is large, and the improvement of the economy is not facilitated;

the transient response performance of the natural gas engine is limited to degree by the response delay of the throttle , which is not favorable for the optimization of the transient response performance of the engine.

Therefore, how to improve the economy and transient response of the gas engine is a technical problem that needs to be solved by those skilled in the art.

SUMMERY OF THE UTILITY MODEL

In view of the above, the present invention provides intake bypass systems and gas engines for improving the economy and transient response of the gas engines.

In order to achieve the above purpose, the utility model provides a following technical scheme:

air inlet bypass system, be applied to gas engine, including air inlet bypass pipeline and air inlet bypass valve, the air inlet bypass valve sets up inside the air inlet pipeline between compressor and throttle , the end of air inlet bypass pipeline connect in the air inlet bypass valve and end communicates in addition in the preceding pipeline of compressor, the air inlet bypass valve includes aperture adjustment mechanism and follows the inner tube that air inlet pipeline axially extended and both ends open, the section of thick bamboo wall of inner tube has seted up opening, the pipe wall of air inlet pipeline has seted up the second opening, opening with the second opening is in the axial position along the air inlet pipeline corresponds, the second opening with air inlet bypass pipeline intercommunication, the edge of opening passes through the sealing washer with the pipe wall butt of air inlet pipeline, aperture adjustment mechanism including set up in driving medium of inner tube periphery and with the second driving medium that driving medium transmission is connected, the pipe wall of air inlet pipeline has seted up the third opening that supplies the second driving medium pipe wall to stretch out, external force can pass through drive medium control when the second stretches out the effect end of pipe wall the inner tube rotate around the axis pipeline.

Preferably, in the above intake bypass system, the th transmission element is a th gear sleeved on the outer periphery of the inner cylinder, and the second transmission element is a second gear engaged with the th gear.

Preferably, in the intake bypass system, the opening degree adjustment mechanism further includes a driving device connected to an action end of the second transmission member.

Preferably, in the intake bypass system described above, the driving device is an electric motor.

Preferably, in the intake bypass system, the th opening is a rectangular opening.

Preferably, in the intake bypass system, the inner cylinder is arranged coaxially with the intake pipe.

Preferably, in the above intake bypass system, a bearing is provided between an outer periphery of the inner cylinder and a pipe wall of the intake pipe.

Preferably, in the air intake bypass system, the sealing rings in sealing contact with the tube wall of the air intake pipeline are sleeved at positions on the outer periphery of the inner tube corresponding to the two axial sides of the third opening along the inner tube, and the sealing rings in sealing contact with the tube wall of the air intake pipeline are sleeved at the outer peripheries of the two ends of the inner tube.

Preferably, in the above air intake bypass system, the sealing ring is a felt ring and labyrinth device combined structure.

The utility model provides an air inlet bypass system's theory of operation as follows:

when the air inlet bypass system is in an open state, the amount of bypass gas is controlled by the air inlet bypass valve at the moment, part of intercooled gas enters the cylinder, part of intercooled gas is introduced into a front pipeline of the air compressor through an air inlet bypass pipeline, so that the air inflow before the air throttle is reduced, the opening degree of the air throttle can be increased, and finally the output of the engine reaches a required torque value.

When the engine is in an acceleration stage, the throttle starts to be maintained at a larger opening degree than the original state at the moment by closing the air inlet bypass valve in advance, so that the response delay of the throttle in the acceleration process is reduced, and the transient response of the engine is improved.

The utility model discloses kinds of gaseous engine including above-mentioned air intake bypass system the derivation process of the beneficial effect that this engine produced is similar on the whole with the derivation process of the beneficial effect that above-mentioned air intake bypass system brought, therefore no longer explains herein.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only the embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.

Fig. 1 is a schematic diagram of an intake bypass system in a closed state according to an embodiment of the present invention;

fig. 2 is a schematic diagram of an air intake bypass system in an open state according to an embodiment of the present invention;

FIG. 3 is a schematic diagram illustrating the relationship between the opening of throttle and the engine load during acceleration of the engine according to an embodiment of the present invention;

fig. 4 is a sectional view of the intake bypass valve and the intake pipe and the intake bypass pipe in an assembled state according to an embodiment of the present invention;

fig. 5 is a top view of the intake bypass valve and the intake pipe and the intake bypass pipe in an assembled state according to an embodiment of the present invention;

fig. 6 is a perspective view of the intake bypass valve, the intake pipe and the intake bypass pipe in an assembled state according to an embodiment of the present invention;

fig. 7 is a side view of the intake bypass valve in an assembled state with the intake pipe and the intake bypass pipe according to an embodiment of the present invention;

fig. 8 is a schematic view illustrating a state in which the inner cylinder and the opening of the air inlet pipeline are completely overlapped according to an embodiment of the present invention;

fig. 9 is a schematic view illustrating an overlapping state of the inner cylinder and the opening portion of the air intake pipeline according to an embodiment of the present invention;

fig. 10 is a schematic view illustrating a state in which openings of the inner cylinder and the air intake pipeline are completely staggered according to an embodiment of the present invention.

In fig. 1 to 10:

the engine comprises a 1-compressor front pipeline, a 2-compressor, a 3-air inlet bypass pipeline, a 4-intercooler, a 5-air inlet pipeline, a 6-air inlet bypass valve, a 7-throttle , an 8-engine, a 9-flow cross section, a 51-second opening, a 52-third opening, a 61-inner cylinder, a 62- opening, a 63- gear, a 64-second gear, a 65-sealing ring and a 66-bearing.

Detailed Description

The technical solution in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of , but not all embodiments.

Referring to fig. 1 to 10, the present invention provides kinds of air intake bypass systems, which are applied to a gas engine, including an air intake bypass pipeline 3 and an air intake bypass valve 6, the air intake bypass valve 6 is disposed inside an air intake pipeline 5 between an air compressor 2 and a throttle 7, an end of the air intake bypass pipeline 3 is connected to the air intake bypass valve 6 and another end is communicated with the air compressor front pipeline 1, the air intake bypass valve 6 includes an opening adjusting mechanism and an inner cylinder 61 extending axially along the air intake pipeline 5 and having openings at two ends, an opening 62 is disposed on a cylinder wall of the inner cylinder 61, a second opening 51 is disposed on a pipe wall of the air intake pipeline 5, the opening 62 corresponds to the second opening 51 at an axial position along the air intake pipeline 5, the second opening 51 is communicated with the air intake bypass pipeline 3, an edge of the opening 62 is abutted against a pipe wall of the air intake pipeline 5 through a sealing ring 65, the opening adjusting mechanism includes a transmission member disposed at an outer periphery of the inner cylinder 61 and a second transmission member connected to the inner cylinder , a transmission member 52 for the pipe wall of the second transmission member extending out of the second transmission member is disposed at a pipe wall of the inner cylinder.

as shown in figure 1, in the closed state of the air inlet bypass system, air after the air compressor 2 is cooled by the intercooler 4, then the air quantity is controlled by the throttle 7, and the air is mixed with fuel gas and then enters the cylinder of the engine 8. in the open state of the air inlet bypass system, as shown in figure 2, the bypass air quantity is controlled by the air inlet bypass valve 6, cold air in part enters the cylinder of the engine 8, cold air in part is introduced into the front pipeline 1 of the air compressor through the air inlet bypass pipeline 3, so that the air inlet quantity before the throttle 7 is reduced, the opening degree of the throttle 7 can be increased, and finally the output of the engine 8 reaches the required torque value.

When the engine 8 is in an acceleration stage, the throttle valve starts to be maintained at a larger opening degree than the original state by closing the intake bypass valve 6 in advance, so that the response delay of the throttle valve in the acceleration process is reduced, and the transient response of the engine 8 is improved.

Referring to fig. 3, fig. 3 is a schematic diagram showing a relationship between an opening degree of a throttle and an engine load in an engine acceleration process according to an embodiment of the present invention, as can be seen from fig. 3, in an original engine state, an opening degree of a throttle is shown as a solid line along with a change in the engine load, in an intake bypass state, at the same load before the C state, an opening degree of a throttle is larger than that in the original engine state, and an opening degree of a throttle is shown as a circled solid line along with a change in the engine load.

It should be noted that the opening degree adjusting mechanism adjusts the size of the communicating area between the second opening 62 and the second opening 51 by controlling the rotation angle of the inner cylinder 61 relative to the air inlet pipeline 5 through two transmission members, and further adjusts the opening degree of the air inlet bypass valve 6, wherein the opening degree adjusting mechanism can achieve the rotation control of the inner cylinder 61 through transmission members with different structural forms, for example, a gear is arranged on the outer periphery of the inner cylinder 61, and a gear meshed with the inner cylinder 5 is arranged on the outer side of the air inlet pipeline 5, and the rotation of the inner cylinder 61 can be achieved by rotating the outer gear, or a gear is arranged on the outer periphery of the inner cylinder 61, and a belt wheel connected with the inner gear is arranged on the outer side of the air inlet pipeline 5, and the rotation control of the inner cylinder 61 can be achieved by rotating the belt wheel, and the rotation control of the inner cylinder 61 can be achieved by reciprocating the gear, and the reduction system is preferably, the is the second transmission member sleeved on the outer periphery of the inner cylinder 61, the gear, the second transmission member is a belt wheel connected with the gear connected with the inner cylinder 61, and the belt wheel, and the rotation control of the inner cylinder 61 can be achieved by rotating the gear 3564, and the reduction system is designed to be more easily arranged on the supporting shaft 3563, and the supporting gear 3564, and the supporting gear 3563 is arranged on the supporting shaft 3563, and the supporting gear is arranged on the supporting gear 3563, and the supporting gear is arranged on the supporting shaft 3563, so as shown in order to facilitate the supporting shaft 357, and the supporting gear 3563, and the supporting gear is further, the supporting gear is designed to achieve the supporting gear is more conveniently and the supporting.

The opening degree adjusting mechanism may be manually or automatically controlled to perform adjustment control. For example, when manual control is adopted, the inner cylinder 61 can be driven to rotate by manually applying an acting force through a linkage mechanism connected with the second transmission member; when automatic control is adopted, the driving device such as an electric driving device, a pneumatic driving device or a hydraulic driving device can be connected to the second transmission part, then the driving device is connected with a manual adjusting switch or an ECU (electronic control unit), the ECU can timely receive engine load information and send corresponding control signals to the driving device, the rotation of the inner barrel 61 is controlled by controlling the starting and stopping and the forward and reverse rotation of the driving device, and the opening degree of the air inlet bypass valve 6 is further controlled. Preferably, in the above intake bypass system, the opening degree adjustment mechanism further includes a drive device connected to the action end of the second transmission member.

preferably, the driving device is a motor, and the motor is connected to the action end of the second transmission member, specifically, in the above embodiment, the motor is connected to the second gear 64 in a transmission manner, and when the motor is started, the second gear 64 is driven to rotate, and the gear 63 and the inner cylinder 61 are driven to rotate.

In order to achieve flexibility of the flow area of the intake bypass valve 6, in this embodiment, the th opening 63 is preferably shaped as a rectangular opening, the periphery of the rectangular opening is preferably chamfered, the length direction of the rectangular opening is equal to the extension direction of the intake pipe 5, the second opening 51 formed in the intake pipe 5 may be designed as a round opening or a rectangular opening, and the second opening 51 communicates with the intake bypass pipe 3.

It should be noted that the inner cylinder 61 extends along the axial direction of the intake duct 5, the inner cylinder 61 rotates around its own axis when rotating, and the axis of the inner cylinder 61 may be arranged to coincide with the axis of the intake duct 5 or may not be arranged to coincide with the axis. Preferably, in the above intake bypass system, the inner tube 61 is arranged coaxially with the intake pipe 5. So set up, still be convenient for set up gear drive mechanism or rotation support mechanism etc..

Step , preferably, in the above intake bypass system, a bearing 66 is disposed between the outer periphery of the inner cylinder 61 and the pipe wall of the intake pipe 5, as shown in fig. 4, since an assembly space is left between the inner cylinder 61 and the intake pipe 5, the gas flow generates an axial force of to the bearing 66 in the gap between the inner cylinder and the outer cylinder, and since the axial acting area is small, the axial force is not large, therefore, the bearing 66 in this solution preferably adopts a tapered roller bearing, which can bear a large radial load and can also bear an axial load of at the same time.

As shown in FIG. 4, the second transmission member extends out of the third opening 52, if the sealing effect at the third opening 52 is not good, a gap is left at the third opening 52, the intake air in the intake pipe 5 leaks out from the gap, and the normal intake air of the engine is affected, in order to avoid air leakage, preferably, in the intake bypass system, the outer periphery of the inner cylinder 61 corresponding to the positions of the third opening 52 at the two sides along the axial direction of the inner cylinder 61 is sleeved with a sealing ring 65 in sealing contact with the pipe wall of the intake pipe 5, the outer peripheries of the two ends of the inner cylinder 61 are sleeved with sealing rings 65 in sealing contact with the pipe wall of the intake pipe 5, the sealing rings 65 rotate along with the inner cylinder 61 , and are kept in sealing contact with the inner wall of the intake pipe 5 at any time, so that air leakage can be avoided, and the.

preferably, in the above air intake bypass system, the sealing ring 66 is a felt ring and labyrinth combined structure, and the sealing ring 66 uses a double sealing structure, which can further increase the sealing effect of the sealing device and improve the air intake safety.

The intercooled gas flows in the inner cylinder 61, and the intake bypass valve 6 flexibly controls the opening degree through the phase matching between the inner cylinder 61 and the intake pipeline 5. fig. 8 to 10 show schematic diagrams of different phase matching between the inner cylinder 61 and the intake pipeline 5, arrows in fig. 8 to 10 indicate the flow direction of the gas in the intake bypass valve 6, and two rectangular frames represent the relative positions of the -th opening 62 and the second opening 51. the motor rotates the inner cylinder 61 through a gear, as shown in fig. 8, when the inner cylinder 61 and the opening of the intake pipeline 5 completely overlap, the flow cross section 9 of the intake bypass valve 6 reaches the maximum area state, at which the ventilation amount of the intake bypass valve 6 is maximum, and as the inner cylinder 61 continues to rotate, as shown in fig. 9, the area of the overlapping area of the inner cylinder 61 and the opening of the intake pipeline 5 is reduced, that is, the area of the flow cross section 9 of the intake bypass valve 6 is reduced, the intake bypass amount is reduced accordingly, as shown in fig. 10, when the openings of the inner cylinder 61 and the intake bypass pipeline 5 are completely staggered, at this time, the intake bypass valve 6 is in the closed state.

The scheme provides an air inlet bypass system applied to a gas engine, and an air inlet bypass valve 6 controlled through rotation is designed on the basis, under the working condition of a load point, intercooled gas is introduced into a front pipeline 1 of the air compressor through an air inlet bypass pipeline 3, the air inlet amount of the air compressor 2 is reduced, in order to achieve the required torque value of the load point, the opening degree of a throttle is increased, so that the pressure loss before and after the throttle is reduced, and the purpose of optimizing economy is achieved.

The utility model discloses following beneficial effect has:

1) the air inlet bypass system can reduce the pumping loss of partial load of the engine and is beneficial to improving the economy;

2) the air inlet bypass system can improve the transient response of the engine;

3) the air inlet bypass valve adopts a rotating mechanism, and the flexible and controllable flow capacity of the valve is realized by controlling the flow cross section;

4) the air inlet bypass system is simple in arrangement, the overall arrangement form of the engine is not influenced, the cost of the engine is increased very little, and the air inlet bypass valve is of a mechanical structure, is simple and reliable and is low in cost.

Various modifications to these embodiments will be readily apparent to those skilled in the art, and the -like principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the invention.

Claims

The gas inlet bypass system is applied to a gas engine and is characterized by comprising a gas inlet bypass pipeline (3) and a gas inlet bypass valve (6), wherein the gas inlet bypass valve (6) is arranged inside a gas inlet pipeline (5) between a gas compressor (2) and a throttle (7), the end of the gas inlet bypass pipeline (3) is connected to the gas inlet bypass valve (6) and the end of the gas inlet bypass pipeline is communicated with the gas compressor front pipeline (1), the gas inlet bypass valve (6) comprises an opening adjusting mechanism and an inner cylinder (61) which axially extends along the gas inlet pipeline (5) and has two ends opened, the cylinder wall of the inner cylinder (61) is provided with a opening (62), the pipe wall of the gas inlet pipeline (5) is provided with a second opening (51), the opening (62) and the second opening (51) correspond to the axial position of the gas inlet pipeline (5) along the axial direction of the gas inlet pipeline, the second opening (51) is communicated with the gas inlet bypass pipeline (3), the edge of the first opening (62) is abutted to the pipe wall (65) of the pipe wall of the pipe, the pipe wall of the second opening (355) is connected with a transmission piece (), and the transmission piece is arranged on the outer wall of the inner cylinder (355) and the transmission piece for controlling the outer transmission piece, and the outer transmission piece (355) and the transmission piece for controlling the outer transmission piece (355) to extend out of the transmission piece, and the transmission piece (3) and the transmission.
2. The air intake bypass system according to claim 1, wherein the th transmission element is a th gear (63) sleeved on the outer periphery of the inner cylinder (61), and the second transmission element is a second gear (64) meshed with the th gear (63).
3. The intake bypass system according to claim 1, wherein the opening degree adjustment mechanism further comprises a driving device connected to an action end of the second transmission member.
4. The intake bypass system of claim 3, wherein the drive device is an electric motor.
5. The intake bypass system according to claim 1, wherein the opening (62) is a rectangular opening.
6. The intake bypass system according to claim 1, characterized in that the inner drum (61) is arranged coaxially with the intake duct (5).
7. The intake bypass system according to claim 6, characterized in that a bearing (66) is provided between the outer circumference of the inner cylinder (61) and the pipe wall of the intake pipe (5).
8. The intake bypass system according to claim 1, wherein the sealing rings (65) in sealing contact with the tube wall of the intake pipeline (5) are sleeved on the outer peripheries of the inner tube (61) at positions corresponding to the two sides of the third opening (52) along the axial direction of the inner tube (61), and the sealing rings (65) in sealing contact with the tube wall of the intake pipeline (5) are sleeved on the outer peripheries of the two ends of the inner tube (61).
9. The air intake bypass system according to claim 1, characterized in that the sealing ring (65) is a felt ring and labyrinth combination.
A gas engine of , comprising an intake bypass system of as claimed in any one of claims 1 to 9.