CN210239844U

CN210239844U - Exhaust pressure stabilizing cavity, sequential supercharging system and engine

Info

Publication number: CN210239844U
Application number: CN201921049179.4U
Authority: CN
Inventors: Fan Zeng; 曾凡; Junlong Liu; 刘俊龙; Bin Pang; 庞斌; Junli Wang; 王俊莉
Original assignee: Weichai Power Co Ltd
Current assignee: Weichai Power Co Ltd
Priority date: 2019-07-05
Filing date: 2019-07-05
Publication date: 2020-04-03
Anticipated expiration: 2029-07-05

Abstract

The utility model relates to an exhaust pressure stabilizing cavity, a sequential supercharging system and an engine, wherein the exhaust pressure stabilizing cavity comprises a front cavity and a rear cavity which are mutually communicated, one end of the front cavity, which is far away from the rear cavity, is used for connecting an exhaust pipe, the communication end of the front cavity and the rear cavity is provided with a front turbine port, the front turbine port is provided with a flow guide structure for guiding airflow from the front cavity to the front turbine port, the caliber of the rear cavity is smaller than that of the front cavity, and one end of the rear cavity, which is far away from the front cavity, is provided with a rear turbine port; when the turbine structure is used, the guide structure is arranged at the position of the front-end turbine port, the exhaust flow flowing to the front-end turbine can be increased, the rear-end cavity body adopts reducing treatment relative to the front-end cavity body, the exhaust flow flowing to the rear-end turbine can be reduced, and therefore the flow in each turbine tends to be balanced, the casting volume is reduced due to the reducing design of the rear-end cavity body, and the risk of casting expansion failure is reduced.

Description

Exhaust pressure stabilizing cavity, sequential supercharging system and engine

Technical Field

The utility model relates to an engine aftertreatment technical field, in particular to exhaust steady voltage chamber, turbocharging system and engine in succession.

Background

The adoption of supercharging technology to improve the dynamic property and the economical efficiency of diesel engines and gas engines has become an important technical measure. The exhaust gas turbine can utilize the residual energy in the exhaust gas to do work on the turbine, and then the compressor is driven to rotate to increase the air inlet pressure and improve the air inlet flow. This approach does not require additional work to be expended, improving combustion, increasing power, and reducing emissions. However, there are some problems in the specific matching process. Under the non-matching working condition, due to insufficient exhaust energy, the energy which can be provided for the compressor by the turbine end is insufficient, so that the rotating speed of the supercharger is rapidly reduced, the pressure ratio of the compressor is reduced, the air inlet pressure is insufficient, the air inlet flow of the diesel engine is insufficient, the combustion is deteriorated, and the performance of the diesel engine is influenced.

The sequential supercharging technology adopts two or more turbochargers, when the operating condition of the machine is improved or reduced, the operation is switched in or out in sequence, and meanwhile, the circulation interface of the supercharging system also needs to be changed, so that the circulation sectional area of the supercharger which is put into operation is adapted to the operating condition of the diesel engine, and the machine has better economy in the whole operation range.

At present, the existing exhaust cavity is a shell with consistent pipe diameter, and is large in size and difficult to cast; the turbine inlets are uniformly distributed on two sides of the shell and are arranged in a normal direction with the exhaust pipe, the bending angle of the airflow is large, the bending distance of the front-end turbine inlet and the exhaust pipe is limited due to inertia of the airflow, and the gas flow at the rear-end turbine inlet is obviously higher than that at the front end. This causes uneven work between superchargers that supercharge in succession, and rear end turbine rotational speed is high flow big, and the overspeed risk is high, and the life-span receives certain influence, and the unevenness of a plurality of superchargers work also can make the booster shake characteristic change, influences the reliability.

SUMMERY OF THE UTILITY MODEL

The utility model discloses an exhaust steady voltage chamber to reach the flow difference that reduces between front end turbine and the rear end turbine, avoid the rear end turbine to overspeed, improve rear end turbine life-span and reliability, and reduce the purpose of casting inflation inefficacy risk.

The utility model also provides a pressure boost system handover engine in succession including above-mentioned exhaust steady voltage chamber.

The specific scheme is as follows:

the utility model provides an exhaust steady voltage chamber, includes the front end cavity and the rear end cavity that communicate each other, the front end cavity is kept away from the one end of rear end cavity is used for connecting the blast pipe, the front end cavity with the intercommunication end of rear end cavity is provided with front end turbine mouth, just front end turbine mouth department is provided with and is used for following the air current the front end cavity direction the water conservancy diversion structure of front end turbine mouth, the bore of rear end cavity is less than the bore of front end cavity, the rear end cavity is kept away from the one end of front end cavity is provided with rear end turbine mouth.

Preferably, the flow guide structure comprises a flow guide plate, the flow guide plate is formed by extending the side wall of the rear end cavity to the front end cavity, and the flow guide plate is in smooth transition connection with the front end turbine port through an arc surface.

Preferably, the flow guiding structure further comprises a flow guiding arc surface arranged between the front end cavity and the front end turbine port.

Preferably, the arc surface is smoothly connected with the flow guide arc surface.

Preferably, a control valve for adjusting the opening degree of the front turbine port is arranged in the front turbine port.

Preferably, the front turbine port is provided in plurality, and the control valve is provided in each of the front turbine ports.

Preferably, the rear end cavity is kept away from the one end of front end cavity is provided with a plurality of circumference equipartitions the rear end turbine mouth, just the rear end cavity is kept away from the one end of front end cavity is provided with and is used for guiding each the water conservancy diversion of rear end turbine mouth is protruding.

Preferably, the aft end cavity and each aft end turbine port are in smooth transition.

A sequential supercharging system, comprising:

an exhaust plenum as claimed in any one of the above;

the air inlet of the turbine of the front-end turbocharger is communicated with the front-end turbine port of the exhaust pressure stabilizing cavity, and the air inlet of the turbine of the rear-end turbocharger is communicated with the rear-end turbine port of the exhaust pressure stabilizing cavity.

An engine comprising a sequential supercharging system as described above.

According to the technical scheme, the utility model discloses an exhaust pressure stabilizing cavity, which comprises a front cavity and a rear cavity which are mutually communicated, wherein one end of the front cavity, which is far away from the rear cavity, is used for connecting an exhaust pipe, the communication end of the front cavity and the rear cavity is provided with a front turbine port, the front turbine port is provided with a flow guide structure for guiding airflow from the front cavity to the front turbine port, the caliber of the rear cavity is smaller than that of the front cavity, and one end of the rear cavity, which is far away from the front cavity, is provided with a rear turbine port; when the exhaust gas turbine is used, the diversion structure is arranged at the position of the front-end turbine port, the exhaust flow flowing to the front-end turbine can be increased, meanwhile, the rear-end cavity body adopts reducing treatment relative to the front-end cavity body, and the exhaust flow flowing to the rear-end turbine can be reduced, so that the flow in the front-end turbine and the flow in the rear-end turbine tend to be balanced, and due to the reducing design of the rear-end cavity body, the casting volume is reduced, the risk of casting expansion failure is reduced, the cavity body can be cast without being divided into two sections, and the mold cost and the production assembly difficulty are reduced.

The utility model also provides a turbocharging system in succession and including this turbocharging system in succession engine including above-mentioned exhaust steady voltage chamber, because this turbocharging system in succession and engine have adopted as above exhaust steady voltage chamber, consequently turbocharging system and engine have the beneficial effect in above-mentioned exhaust steady voltage chamber concurrently in succession, no longer describe herein.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings 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 some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.

Fig. 1 is an axonometric view of an exhaust plenum provided by an embodiment of the present invention;

fig. 2 is an internal structure schematic diagram of an exhaust pressure stabilizing cavity provided by the embodiment of the utility model.

Wherein:

1 is a front end cavity; 2 is a rear cavity; 3 is a front turbine port; 4 is the rear turbine port; 5 is a guide plate; 6 is a flow guide arc surface; 7 is a control valve; 8 is a flow guide bulge.

Detailed Description

One of the cores of the utility model is to provide an exhaust pressure stabilizing cavity to reach the flow difference that reduces between front end turbine and the rear end turbine, avoid the rear end turbine to overspeed, improve rear end turbine life-span and reliability, and reduce the purpose of casting inflation inefficacy risk.

The other core of the utility model is to provide a turbocharging system and engine in succession including above-mentioned exhaust surge damping chamber.

The technical solutions 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 the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.

Referring to fig. 1 and fig. 2, fig. 1 is an axonometric view of an exhaust pressure stabilizing cavity provided in an embodiment of the present invention, and fig. 2 is a schematic diagram of an internal structure of the exhaust pressure stabilizing cavity provided in the embodiment of the present invention.

The embodiment of the utility model provides an in disclose an exhaust steady voltage chamber, this exhaust steady voltage chamber is including the front end cavity 1 and the rear end cavity 2 that communicate each other.

Wherein, the one end that rear end cavity 2 was kept away from to front end cavity 1 is used for connecting the blast pipe, front end cavity 1 is provided with front end turbine mouth 3 with the intercommunication end of rear end cavity 2, and front end turbine mouth 3 department is provided with the water conservancy diversion structure that is used for leading the air current from front end cavity 1 to front end turbine mouth 3, the bore of rear end cavity 2 is less than the bore of front end cavity 1, the one end that front end cavity 1 was kept away from to rear end cavity 2 is provided with rear end turbine mouth 4, above-mentioned front end turbine mouth 3 and rear end turbine mouth 4 can set up one or more.

It can be seen that, compared with the prior art, when the exhaust pressure stabilizing cavity disclosed in the above embodiment is used, because the front turbine port 3 is provided with the flow guide structure, the exhaust flow flowing to the front turbine can be increased, and meanwhile, the rear cavity 2 adopts the diameter reduction treatment relative to the front cavity 1, the exhaust flow flowing to the rear turbine can be reduced, so that the flows in the front turbine and the rear turbine tend to be balanced, and because of the diameter reduction design of the rear cavity 2, the casting volume is reduced, the risk of casting expansion failure is reduced, the cavity does not need to be cast in two sections, and the mold cost and the production assembly difficulty are reduced.

Preferably, as shown in fig. 2, in an embodiment of the present invention, the flow guiding structure includes a flow guiding plate 5, the flow guiding plate 5 is formed by extending a side wall of the rear cavity 2 to the front cavity 1, and the flow guiding plate 5 and the front turbine port 3 are connected by a smooth transition of an arc surface, in practical application, the flow guiding plate 5 can guide a portion of the exhaust gas flow to enter the front turbine port 3 to increase the flow of the front turbine, so that the flow difference between the front turbine and the rear turbine is reduced.

Preferably, the flow guiding structure further comprises a flow guiding arc surface 6 arranged between the front end cavity 1 and the front end turbine port 3, and energy loss when the airflow turns to enter the front end turbine port 3 can be reduced through the flow guiding arc surface 6.

Furthermore, the arc surface is smoothly connected with the flow guide arc surface 6.

Preferably, a control valve 7 for adjusting the opening degree of the front turbine port 3 is provided in the front turbine port 3, and the control valve 7 can make the front turbine port 3 cut in or cut out according to the engine operating state, thereby controlling the number of turbines in the supercharging system in the operating state.

Further, a plurality of front turbine ports 3 can be arranged, control valves 7 are arranged in the front turbine ports 3, and each control valve 7 can be independently controlled so as to realize free cutting-in and cutting-out of each front turbine.

Preferably, one end of the rear cavity 2, which is far away from the front cavity 1, is provided with a plurality of rear turbine ports 4 which are uniformly distributed in the circumferential direction, and one end of the rear cavity 2, which is far away from the front cavity 1, is provided with a flow guide protrusion 8 for guiding the airflow to each rear turbine port 4, and the flow guide protrusion 8 can guide the airflow in the rear cavity 2 before flowing into the rear turbine ports 4, so that the kinetic energy loss of the airflow is reduced.

Further, smooth transition is formed between the rear end cavity 2 and each rear end turbine port 4, so that the energy loss of airflow is reduced.

Based on above-mentioned exhaust pressure stabilizing cavity, the utility model also provides a consecutive turbocharging system, including front end turbo charger, rear end turbo charger and as above arbitrary one the exhaust pressure stabilizing cavity, the air inlet of front end turbo charger's turbine and the front end turbine mouth 3 intercommunication in exhaust pressure stabilizing cavity, the air inlet of rear end turbo charger's turbine and the rear end turbine mouth 4 intercommunication in exhaust pressure stabilizing cavity, further, the utility model also provides an engine, this engine include as above turbocharging system in succession, because this in succession turbocharging system and engine have adopted the exhaust pressure stabilizing cavity of above-mentioned embodiment, consequently, the beneficial effect of above-mentioned turbocharging system in succession and engine please refer to above-mentioned embodiment.

The embodiments in the present description are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other.

The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. The utility model provides an exhaust steady voltage chamber, its characterized in that, is including the front end cavity and the rear end cavity that communicate each other, the front end cavity is kept away from the one end of rear end cavity is used for connecting the blast pipe, the front end cavity with the intercommunication end of rear end cavity is provided with front end turbine mouth, just front end turbine mouth department is provided with and is used for following the air current the front end cavity direction the water conservancy diversion structure of front end turbine mouth, the bore of rear end cavity is less than the bore of front end cavity, the rear end cavity is kept away from the one end of front end cavity is provided with rear end turbine mouth.

2. The exhaust plenum according to claim 1, wherein the flow guide structure comprises a flow guide plate, the flow guide plate is formed by extending a side wall of the rear end cavity to the front end cavity, and the flow guide plate is in smooth transition connection with the front end turbine port through a circular arc surface.

3. The exhaust plenum of claim 2, wherein the flow directing structure further comprises a flow directing arc disposed between the front end cavity and the front end turbine port.

4. The exhaust and pressure stabilization cavity according to claim 3, wherein the arc surface is smoothly connected with the flow guide arc surface.

5. The exhaust plenum of any one of claims 1-4, wherein a control valve is disposed in the forward turbine port for adjusting an opening of the forward turbine port.

6. The exhaust plenum of claim 5, wherein the forward turbine port is provided in plurality and the control valve is provided in each of the forward turbine ports.

7. The exhaust plenum according to any one of claims 1 to 4 and 6, wherein the end of the rear cavity remote from the front cavity is provided with a plurality of circumferentially evenly distributed rear turbine ports, and the end of the rear cavity remote from the front cavity is provided with flow guide projections for guiding the air flow to each of the rear turbine ports.

8. The exhaust plenum of claim 7, wherein the aft end cavity and each of the aft end turbine ports are rounded.

9. A sequential supercharging system, comprising:

an exhaust plenum as set forth in any one of claims 1 to 8;

10. An engine comprising a sequential supercharging system according to claim 9.