CN211975213U

CN211975213U - Gas mixing device and engine

Info

Publication number: CN211975213U
Application number: CN201922274877.0U
Authority: CN
Inventors: 袁志玲; 李卫; 邹立臣; 王雪鹏
Original assignee: Weichai Power Co Ltd
Current assignee: Weichai Power Co Ltd
Priority date: 2019-12-16
Filing date: 2019-12-16
Publication date: 2020-11-20
Anticipated expiration: 2029-12-16

Abstract

The utility model discloses a gas mixing device and engine, wherein gas mixing device includes gas mixing chamber, honeycomb duct and whirl board, and the gas mixing chamber lateral wall is equipped with waste gas entry, fresh air entry and mist outlet. The honeycomb duct is used for separating the gas mixing chamber into a mixing area and a waste gas buffer area which is arranged outside the mixing area in a sleeved mode, a plurality of air holes which are communicated with the waste gas buffer area and the mixing area are formed in the honeycomb duct, and a waste gas inlet is connected with the waste gas buffer area. The whirl board sets up in the mixing area, and fresh air inlet and mist outlet arrange respectively in the relative both ends of mixing area. Through setting up the honeycomb duct, discharge mist through a plurality of air vents, avoid waste gas to pile up at a position, set up the whirl board in mixing the district for fresh air and waste gas intensive mixing, consequently, the gas mixing effect of the gas mixing device that this application provided improves.

Description

Gas mixing device and engine

Technical Field

The utility model relates to an exhaust gas recirculation technical field, in particular to gas mixing device. The utility model discloses still relate to an engine including above-mentioned gas mixing arrangement.

Background

In an engine exhaust gas recirculation system, a technology for separating a part of exhaust gas after combustion in an internal combustion engine and introducing the separated exhaust gas to an intake side for re-combustion is mainly aimed at reducing nitrogen oxides in the exhaust gas and improving fuel consumption when a part of load is shared.

A conventional gas mixing device includes a gas mixing chamber, a waste gas inlet in communication with the gas mixing chamber, a fresh air inlet, and a mixed gas outlet. The waste gas enters the gas mixing cavity through the waste gas inlet, the fresh air enters the gas mixing cavity through the fresh air inlet, and the fresh air and the waste gas are mixed in the gas mixing cavity and then discharged through the mixed gas outlet.

However, for the plug-in gas mixing device, the EGR rate at the core is higher and the circumferential EGR rate is lower, resulting in poor overall gas mixing effect of the gas mixing device.

Therefore, how to improve the gas mixing effect of the gas mixing device is a technical problem that needs to be solved urgently by those skilled in the art.

SUMMERY OF THE UTILITY MODEL

The utility model aims at providing a gas mixing device, this gas mixing device's gas mixing effect improves. Another object of the present invention is to provide an engine including the above gas mixing device.

In order to achieve the purpose, the utility model provides a gas mixing device, which comprises a gas mixing cavity, wherein the side wall of the gas mixing cavity is provided with a waste gas inlet, a fresh air inlet and a mixed gas outlet;

the guide pipe is used for dividing the gas mixing cavity into a mixing area and a waste gas buffer area sleeved outside the mixing area, a plurality of vent holes for communicating the waste gas buffer area with the mixing area are formed in the guide pipe, and the waste gas inlet is connected with the waste gas buffer area;

and the fresh air inlet and the mixed gas outlet are respectively arranged at two opposite ends of the mixing area.

Preferably, the two ends of the draft tube extend to the side walls of the mixed gas outlet and the two ends of the fresh air inlet respectively, and the vent holes are sequentially arranged in a plurality of rows along the circumferential direction of the draft tube.

Preferably, the vent hole is a tapered hole which is tapered from the air inlet end to the air outlet end.

Preferably, still include the back shaft, the whirl board is a plurality of, and is a plurality of the whirl board is followed fresh air inlet extremely the mist outlet direction connects gradually on the back shaft, the both ends of back shaft connect respectively in fresh air inlet with mist outlet position.

Preferably, the bearing device further comprises two bearing assemblies respectively arranged at two opposite ends of the supporting shaft, wherein each bearing assembly comprises a bearing connected with the supporting shaft and a bearing bracket used for fixing the bearing.

Preferably, the outer edges of the two bearing supports are respectively connected with the inner wall of the fresh air inlet and the inner wall of the mixed gas outlet, and a channel for gas to pass through is arranged between the bearing supports.

Preferably, still include first body and second body, first body first end is fresh air inlet, the second end of first body with the first end sealing connection of second body forms the gas mixing chamber, the second end of second body is the mixed gas export, waste gas inlet sets up first body or on the lateral wall of second body.

Preferably, the pipe diameter of the first end of the first pipe body is smaller than that of the second end of the first pipe body, and the pipe diameter of the second end of the second pipe body is smaller than that of the first end of the second pipe body.

Preferably, the outer wall of the guide pipe is equal to the side wall of the gas mixing cavity in distance, and the swirl plate is arranged at the central position of the gas mixing cavity.

An engine comprising a gas mixing device as claimed in any one of the preceding claims.

In the technical scheme, the utility model provides a gas mixing device includes gas mixing chamber, honeycomb duct and whirl board, and the gas mixing chamber lateral wall is equipped with waste gas entry, fresh air entry and mist outlet. The honeycomb duct is used for separating the gas mixing chamber into a mixing area and a waste gas buffer area which is arranged outside the mixing area in a sleeved mode, a plurality of air holes which are communicated with the waste gas buffer area and the mixing area are formed in the honeycomb duct, and a waste gas inlet is connected with the waste gas buffer area. The whirl board sets up in the mixing area, and fresh air inlet and mist outlet arrange respectively in the relative both ends of mixing area. When the gas mixing device is used, waste gas enters the waste gas buffer zone through the waste gas inlet and then enters the mixing zone through the plurality of air holes. Simultaneously fresh air enters the mixing area through the fresh air inlet, and is mixed with waste gas under the action of the cyclone plate, and the mixed gas is discharged through the mixed gas outlet.

Can know through the above-mentioned description, in the gas mixing device that this application provided, through setting up the honeycomb duct, discharge the mist through a plurality of air vents, avoid waste gas to pile up at a position, set up the whirl board in the mixing area for fresh air and waste gas intensive mixing, consequently, the gas mixing effect of the gas mixing device that this application provided improves.

Drawings

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

Fig. 1 is a cross-sectional view of a gas mixing device according to an embodiment of the present invention;

fig. 2 is a three-dimensional structure diagram of a gas mixing device according to an embodiment of the present invention.

Wherein in FIGS. 1-2: the device comprises a waste gas pipe 1, a first pipe body 2, a second pipe body 3, a flow guide pipe 4, a vent hole 41, a rotational flow plate 5, a bearing support 6, a bearing 7, a support shaft 8, a gas mixing cavity 9, a waste gas buffer area 91 and a mixing area 92.

Detailed Description

The core of the utility model is to provide a gas mixing device, this gas mixing device's gas mixing effect improves. The other core of the utility model is to provide an engine including above-mentioned gas mixing arrangement.

In order to make those skilled in the art better understand the technical solution of the present invention, the present invention will be further described in detail with reference to the accompanying drawings and embodiments.

Please refer to fig. 1 and fig. 2.

In a specific embodiment, the utility model discloses the gas mixing device that specific embodiment provided includes gas mixing chamber 9, honeycomb duct 4 and whirl board 5, and 9 lateral walls of gas mixing chamber are equipped with waste gas entry, fresh air entry and mist outlet. The draft tube 4 is used for dividing the gas mixing chamber 9 into a mixing area 92 and a waste gas buffer area 91 sleeved outside the mixing area 92, preferably, the mixing area 92 and the waste gas buffer area 91 are overlapped at the center, the draft tube 4 is provided with a plurality of vent holes 41 communicating the waste gas buffer area 91 and the mixing area 92, and a waste gas inlet is connected with the waste gas buffer area 91. Swirl plates 5 are provided in the mixing zone 92, with fresh air inlets and mixed gas outlets arranged at opposite ends of the mixing zone 92, respectively.

In use of the gas mixing device, exhaust gas enters the exhaust buffer zone 91 through the exhaust gas inlet and then enters the mixing zone 92 through the plurality of air holes. Meanwhile, fresh air enters the mixing area 92 through the fresh air inlet, is mixed with waste gas under the action of the cyclone plate 5, and is discharged through the mixed gas outlet.

It can be known from the above description that in the gas mixing device that this application embodiment provided, through setting up honeycomb duct 4, discharge mist through a plurality of air vents 41, avoid waste gas to pile up at a position, set up whirl plate 5 in mixing area 92 for fresh air and waste gas intensive mixing, consequently, the gas mixing effect of the gas mixing device that this application provided improves.

As shown in fig. 1, specifically, two ends of the draft tube 4 extend to the side walls of the mixed gas outlet and the fresh air inlet, respectively, and the vent holes 41 are sequentially arranged in a plurality of rows along the circumferential direction of the draft tube 4. Specifically, the air holes 41 are arranged in a matrix on the wall of the flow guide tube 4.

In one embodiment, the vent 41 is a tapered hole that tapers from the inlet end to the outlet end, i.e., the vent 41 tapers to a point near the mixing zone 92. Specifically, the tapered hole is preferably a conical hole. Preferably, the air holes 41 are arranged in a matrix, or two adjacent rows of air holes 41 are arranged in a staggered manner.

In a specific embodiment, this gas mixing arrangement still includes back shaft 8, and whirl board 5 is a plurality of, and a plurality of whirl boards 5 connect gradually on back shaft 8 along fresh air entry to mist outlet direction, and the both ends of back shaft 8 are connected respectively in fresh air entry and mist outlet position.

Specifically, the gas mixing device further comprises two bearing assemblies respectively arranged at two opposite ends of the supporting shaft 8, wherein each bearing assembly comprises a bearing 7 connected with the supporting shaft 8 and a bearing support 6 used for fixing the bearing 7.

In order to facilitate the installation of the two bearing supports 6, preferably, the outer edges of the two bearing supports 6 are respectively connected with the inner wall of the fresh air inlet and the inner wall of the mixed gas outlet, and a channel for gas to pass through is arranged between the bearing supports 6. The design can be rotatory spinning disk, plays the vortex effect of preferred in mixing area 92 to fresh air and waste gas, realizes fine mixing with two kinds of gases.

Specifically, this gas mixing arrangement still includes first body 2 and second body 3, and the first end of first body 2 is fresh air inlet, and the second end of first body 2 and the first end sealing connection of second body 3 form gas mixing chamber 9, and the second end of second body 3 is the mist export. The waste gas entry is seted up on the lateral wall of first body 2 or second body 3, and is concrete, and waste gas passes through waste gas pipe 1 and introduces gas mixing chamber 9, and waste gas pipe 1 welds on first body 2 or second body 3. At first install 8 one ends of back shaft with whirl board 5 on bearing 7, then install the whirl piece axle other end on bearing 7 in pipe 1, for the convenience of the 9 inner structures of dismouting gas mixing chamber, preferably, first body 2 and second body 3 can dismantle the connection, and is specific, first body 2 and second body 3 can be connected through threaded fastener.

Specifically, all design on the inner wall of first body 2 and second body 3 has the location boss, installs two bearing bracket 6 respectively in first body 2 and second body 3, and bearing bracket 6 and the outer wall butt of location boss install the back welded fastening that targets in place.

In one embodiment, the first end of the first tube 2 has a smaller tube diameter than the second end of the first tube 2, and the second end of the second tube 3 has a smaller tube diameter than the first end of the second tube 3.

Fresh air enters through the first pipe body 2 in the figure 1 and impacts the rotational flow plate 5, and the rotational flow plate 5 rotates under the impact action of high-speed airflow due to the fact that a support shaft 8 of the rotational flow plate 5 is fixed on a bearing 7; waste gas passes through waste gas pipe 1 and gets into waste gas buffer 91, and the air vent 41 of circumference equipartition on the pipe wall of honeycomb duct 4 gets into mixing area 92 with higher speed the back again, and rotatory whirl board 5 plays fine vortex effect in mixing area 92, with fresh air and waste gas misce bene.

Preferably, the outer wall of the draft tube 4 is equal to the side wall of the gas mixing chamber 9 in distance, and the swirl plate 5 is arranged at the center of the gas mixing chamber 9.

The application provides a gas mixing device simple structure easily realizes, and fresh air and waste gas mixing efficiency and mixed effectual promote each jar of combustion homogeneity of engine, improve emission performance, the extensive using widely of being convenient for.

The present application provides an engine including a gas mixing device, wherein the gas mixing device is any one of the gas mixing devices described above, and the specific structure of the gas mixing device is described above.

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. A gas mixing apparatus, comprising:

the side wall of the gas mixing cavity (9) is provided with a waste gas inlet, a fresh air inlet and a mixed gas outlet;

the guide pipe (4) is used for dividing the gas mixing cavity (9) into a mixing area (92) and a waste gas buffer area (91) sleeved outside the mixing area (92), a plurality of vent holes (41) for communicating the waste gas buffer area (91) with the mixing area (92) are formed in the guide pipe (4), and the waste gas inlet is connected with the waste gas buffer area (91);

and a swirl plate (5) disposed within the mixing zone (92), the fresh air inlet and the mixed gas outlet being disposed at opposite ends of the mixing zone (92), respectively.

2. The gas mixing device according to claim 1, wherein the two ends of the draft tube (4) extend to the side walls of the mixed gas outlet and the fresh air inlet, and the vent holes (41) are arranged in a plurality of rows along the circumference of the draft tube (4).

3. The gas mixing device according to claim 1, wherein the vent hole (41) is a tapered hole tapering from an inlet end to an outlet end.

4. The gas mixing device according to claim 1, further comprising a supporting shaft (8), wherein the number of the swirl plates (5) is plural, the plural swirl plates (5) are sequentially connected to the supporting shaft (8) along the direction from the fresh air inlet to the mixed gas outlet, and two ends of the supporting shaft (8) are respectively connected to the fresh air inlet and the mixed gas outlet.

5. A gas mixing device according to claim 4, further comprising two bearing assemblies mounted at opposite ends of the support shaft (8), respectively, the bearing assemblies comprising a bearing (7) connected to the support shaft (8) and a bearing support (6) for fixing the bearing (7).

6. A gas mixing device according to claim 5, characterized in that the outer edges of the two bearing supports (6) are connected with the inner wall of the fresh air inlet and the inner wall of the mixed gas outlet, respectively, and a channel for gas to pass through is arranged between the bearing supports (6).

7. The gas mixing device according to claim 1, further comprising a first pipe (2) and a second pipe (3), wherein the first end of the first pipe (2) is the fresh air inlet, the second end of the first pipe (2) and the first end of the second pipe (3) are hermetically connected to form the gas mixing chamber (9), the second end of the second pipe (3) is a mixed gas outlet, and the waste gas inlet is opened on a side wall of the first pipe (2) or the second pipe (3).

8. A gas mixing device according to claim 7, wherein the first end of the first tube (2) has a smaller tube diameter than the second end of the first tube (2), and the second end of the second tube (3) has a smaller tube diameter than the first end of the second tube (3).

9. A gas mixing device according to any one of claims 1-8, characterized in that the outer wall of the draft tube (4) is equally spaced from the side wall of the gas mixing chamber (9), and the swirl plate (5) is arranged in the center of the gas mixing chamber (9).

10. An engine comprising a gas mixing device, wherein the gas mixing device is as claimed in any one of claims 1 to 9.