CN107252640B

CN107252640B - Pipeline fluid mixer assembly

Info

Publication number: CN107252640B
Application number: CN201710488171.7A
Authority: CN
Inventors: 徐敏; 李卫国; 王必璠; 陈功军; 王振红; 张少华; 王清明
Original assignee: Dongfeng Commercial Vehicle Co Ltd
Current assignee: Dongfeng Commercial Vehicle Co Ltd
Priority date: 2017-06-23
Filing date: 2017-06-23
Publication date: 2023-06-27
Anticipated expiration: 2037-06-23
Also published as: CN107252640A

Abstract

The utility model provides a pipeline fluid mixer assembly, including main fluid pipeline, the blender body, main fluid pipeline is including the main fluid entry end that communicates in proper order, the inner chamber, mixed fluid exit end, the blender body is including the secondary fluid entry end that communicates in proper order, the blender cavity, the exit end stretches into in the inner chamber of main fluid pipeline by the lateral wall of main fluid pipeline, and main fluid inlet has been seted up on the pipe wall of exit end, be used for discharging premixed fluid's a side cut and No. two side cuts, main fluid inlet sets up towards main fluid entry end, no. one side cut, no. two side cuts all set up in the both sides of main fluid inlet towards the inner wall and symmetry of inner chamber. The design has the advantages of small pressure loss, low process cost and high mixing efficiency.

Description

Pipeline fluid mixer assembly

Technical Field

The utility model belongs to the technical field of fluid mixing, and particularly relates to a pipeline fluid mixer assembly which is suitable for mixing gas, EGR (exhaust gas Recirculation) and other gases or other fluids.

Background

The fluid mixer is mainly used for mixing two fluids as uniformly as possible in a desired ratio, such as air and gas mixing for a gas engine, air and EGR gas mixing for a diesel engine or a gasoline engine. In the case of the pipe fluid mixer, since the flow rate, the flow velocity and the pressure are different among different fluids from different pipes, mixing unevenness is easily caused under the influence of each other, and the mixing efficiency is affected by unstable flow velocity, flow rate and the like.

Chinese patent: the utility model patent with the authority bulletin number of CN203452934U and the authority bulletin day of 2014 and 2 month and 26 days discloses an EGR (exhaust gas recirculation) mixer of an EGR (exhaust gas recirculation) diesel engine, which comprises a mixer inner cavity and a mixer, wherein one end of the mixer inner cavity is a natural air inlet, the other end of the mixer inner cavity is a mixed gas outlet, mixer holes are uniformly formed in the annular outer wall of the mixer, and the mixer holes are obliquely distributed array holes. According to the structure, a large number of array holes are formed, fluid in a tube can flow out of each array hole evenly, and mixing uniformity is improved. However, further studies have shown that under the action of the main conduit fluid, a large amount of main fluid may enter the mixer tube from the array holes, impinge on the fluid to be mixed in the mixer, causing the fluid to be mixed to aggregate, resulting in lower mixing efficiency. In addition, from the processing point of view, a large number of array holes cause the processing difficulty to be increased, and the processing amount and the processing cost are also obviously increased.

Disclosure of Invention

The utility model aims to solve the problems of complex structure, high processing cost, large pressure loss and poor mixing effect in the prior art and provides a pipeline fluid mixer assembly with simple structure, low processing cost, small pressure loss and high mixing efficiency.

In order to achieve the above object, the technical scheme of the present utility model is as follows:

the pipeline fluid mixer assembly comprises a main fluid pipeline and a mixer body, wherein the main fluid pipeline comprises a main fluid inlet end and a mixed fluid outlet end, the mixer body comprises a secondary fluid inlet end, a mixer cavity and an outlet end which are sequentially communicated, the outlet end extends into an inner cavity of the main fluid pipeline from the side wall of the main fluid pipeline, and a main fluid inlet which is communicated with the mixer cavity and the inner cavity is formed in the pipe wall of the mixer body;

the main fluid inlet is arranged towards the main fluid inlet end, a first lateral incision and a second lateral incision for discharging premixed fluid are formed in the pipe wall of the outlet end, the first lateral incision and the second lateral incision face the inner wall of the inner cavity, and the first lateral incision and the second lateral incision are symmetrically arranged on two sides of the main fluid inlet.

The first lateral incision and the second lateral incision have the same structure and are groove-shaped structures, the bottom ends of the first lateral incision and the second lateral incision axially extend to the end face of the outlet end, and the outlet end is cut into an inflow plate and a flow baffle by the first lateral incision and the second lateral incision.

The radial width of the inflow plate is smaller than the radial width of the baffle plate.

The radial width of the inflow plate is larger than that of the baffle plate.

The main fluid inlet comprises an opening structure positioned above the first lateral incision and the second lateral incision, and the opening structure is a hole-shaped or radially extending square groove structure.

The main fluid inlet comprises a hole-shaped part and a square groove part, the hole-shaped part is positioned above the first lateral incision and the second lateral incision, the top end of the square groove part is communicated with the bottom of the hole-shaped part, and the bottom end of the square groove part axially extends to the near end face.

The main fluid inlet is of a square groove structure, the top end of the main fluid inlet is located above the first lateral incision and the second lateral incision, and the bottom end of the main fluid inlet axially extends to the end face.

The height of the part of the mixer body extending into the inner cavity is larger than the radius of the inner cavity, and the inner diameter of the mixer cavity is smaller than or equal to the inner diameter of the inner cavity.

The included angle formed by the central axis of the mixer body and the central axis of the main fluid pipeline is 45-90 degrees.

Compared with the prior art, the utility model has the beneficial effects that:

1. according to the pipeline fluid mixer assembly, a main fluid inlet is arranged towards a main fluid inlet end, a first lateral incision and a second lateral incision for discharging premixed fluid are formed in the pipe wall of an outlet end, the first lateral incision and the second lateral incision face the inner wall of an inner cavity and are symmetrically arranged at two sides of the main fluid inlet, namely, outlets of the premixed fluid are arranged at two sides of a mixer body. Therefore, the utility model has the advantages of small pressure loss, high mixing efficiency, simple structure and low processing cost.

2. According to the pipeline fluid mixer assembly, the first lateral incision and the second lateral incision divide the outlet end into the inflow plate and the flow baffle, and the radial width of the inflow plate is smaller than that of the flow baffle. Thus, the present utility model can further improve the mixing efficiency.

3. According to the pipeline fluid mixer assembly, the radial width of the inflow plate is larger than that of the flow baffle, the flow direction of the premixed fluid is sequential through the design, the flow resistance of the fluid can be effectively reduced, and then the pressure loss is reduced. Thus, the present utility model further reduces the pressure loss.

4. The main fluid inlet in the pipeline fluid mixer assembly comprises an opening structure positioned above the first lateral incision and the second lateral incision, and the design increases the area of the main fluid inlet under the condition that the opening space of the lateral incision is not influenced by adding the main fluid inlet at the upstream of the lateral incision, so that the premixing effect of main fluid and secondary fluid is effectively improved. Therefore, the utility model can obtain better premixing effect.

Drawings

Fig. 1 is a schematic structural view of the present utility model.

Fig. 2 is a view in the direction a of fig. 1.

Fig. 3 is a schematic structural view of the mixer body in example 1.

Fig. 4 is a view in the direction a of fig. 3.

Fig. 5 is a schematic structural view of the mixer body in example 2.

Fig. 6 is a view in the direction a of fig. 5.

Fig. 7 is a schematic structural view of a mixer body in embodiment 3.

Fig. 8 is a view in the a direction of fig. 7.

Fig. 9 is a schematic view showing the structure of a mixer body in example 4.

Fig. 10 is a view in the direction a of fig. 9.

Fig. 11 is a schematic structural view of a mixer body in example 5.

Fig. 12 is a view in the a direction of fig. 11.

Fig. 13 is a schematic view showing the structure of a mixer body in example 6.

Fig. 14 is a view in the a direction of fig. 13.

In the figure: the main fluid conduit 1, the main fluid inlet end 11, the mixed fluid outlet end 12, the inner cavity 13, the mixer body 2, the secondary fluid inlet end 21, the mixer cavity 22, the outlet end 23, the main fluid inlet 231, the first lateral slit 232, the second lateral slit 233, the end face 234, the inflow plate 3, the baffle plate 4, the hole-shaped portion 5, and the square groove portion 6.

Detailed Description

The utility model is described in further detail below with reference to the accompanying drawings and detailed description.

Referring to fig. 1 to 14, a pipeline fluid mixer assembly comprises a main fluid pipeline 1 and a mixer body 2, wherein the main fluid pipeline 1 comprises a main fluid inlet end 11 and a mixed fluid outlet end 12, the mixer body 2 comprises a secondary fluid inlet end 21, a mixer cavity 22 and an outlet end 23 which are sequentially communicated, the outlet end 23 extends into an inner cavity 13 of the main fluid pipeline 1 from the side wall of the main fluid pipeline 1, and a main fluid inlet 231 which is communicated with the mixer cavity 22 and the inner cavity 13 is formed in the pipe wall of the mixer body 2;

the main fluid inlet 231 is disposed towards the main fluid inlet 11, a first lateral incision 232 and a second lateral incision 233 for discharging the premixed fluid are formed on the pipe wall of the outlet 23, and the first lateral incision 232 and the second lateral incision 233 are both disposed towards the inner wall of the inner cavity 13 and symmetrically disposed on two sides of the main fluid inlet 231.

The first lateral incision 232 and the second lateral incision 233 have identical structures and are groove-shaped structures, the bottom ends of the first lateral incision 232 and the second lateral incision 233 axially extend to the end face 234 of the outlet end 23, and the outlet end 23 is cut into the inflow plate 3 and the baffle plate 4 by the first lateral incision 232 and the second lateral incision 233.

The radial width of the inflow plate 3 is smaller than the radial width of the baffle plate 4.

The radial width of the inflow plate 3 is larger than the radial width of the baffle plate 4.

The main fluid inlet 231 includes an opening structure above the first and second

lateral cuts

232 and 233, and the opening structure is a hole-shaped or radially extending square groove structure.

The main fluid inlet 231 comprises a hole-shaped part 5 and a square groove part 6, the hole-shaped part 5 is positioned above the first lateral incision 232 and the second lateral incision 233, the top end of the square groove part 6 is communicated with the bottom of the hole-shaped part 5, and the bottom end of the square groove part 6 axially extends to the position of the proximal end face 234.

The main fluid inlet 231 has a square groove structure, the top end of which is located above the first lateral incision 232 and the second lateral incision 233, and the bottom end of which extends axially to the end surface 234.

The height of the part of the mixer body 2 extending into the inner cavity 13 is larger than the radius of the inner cavity 13, and the inner diameter of the mixer cavity 22 is smaller than or equal to the inner diameter of the inner cavity 13.

The included angle formed by the central axis of the mixer body 2 and the central axis of the main fluid pipeline 1 is 45-90 degrees.

The principle of the utility model is explained as follows:

the pipeline fluid mixer assembly provided by the utility model has the advantages that the pressure loss is small, the mixing effect is good, the structure is simple, the flow path and the direction of the premixed fluid are changed by combining the two-stage mixing strategy with the side surface section, the time for carrying out primary mixing on the main fluid and the secondary fluid in the mixer cavity 22 is prolonged, and the mixing efficiency is effectively improved. Meanwhile, the mixing efficiency and the flow resistance are optimized by adjusting the setting direction of the side cuts, so that the optimal matching of the mixing efficiency and the flow resistance is achieved. When the radial width of the inflow plate is the same as the radial width of the baffle plate, the mixing uniformity is high, the pressure loss is low, and the proper notch orientation can be selected in combination with the requirements of the mixer on mixing efficiency and pressure loss in the actual design process.

In addition, the utility model controls the insertion direction of the mixer body 2 and the flow direction of the main fluid at 45-90 degrees, which is beneficial to reducing the flow of the secondary fluid in the mixer cavity 22.

Example 1:

referring to fig. 1 to 4, a pipeline fluid mixer assembly comprises a main fluid pipeline 1 and a mixer body 2, wherein the main fluid pipeline 1 comprises a main fluid inlet end 11, an inner cavity 13 and a mixed fluid outlet end 12 which are sequentially communicated, the mixer body 2 comprises a secondary fluid inlet end 21, a mixer cavity 22 and an outlet end 23 which are sequentially communicated, the outlet end 23 extends into the inner cavity 13 from the side wall of the main fluid pipeline 1, a central axis of the outlet end 23 forms a 45-degree included angle with the central axis of the main fluid pipeline 1, a main fluid inlet 231, a first lateral incision 232 and a second lateral incision 233 for discharging premixed fluid are arranged on the pipe wall of the outlet end 23, the main fluid inlet 231 is of a groove-shaped structure arranged towards the main fluid inlet end 11, the top of the mixer body is positioned above the first lateral incision 232 and the second lateral incision 233, the bottom of the mixer body axially extends to the end face 234, the first lateral incision 232 and the second lateral incision 233 are of a groove-shaped structure with identical structures, the first lateral incision 232 and the second lateral incision 233 face the inner wall of the inner cavity 13 and are symmetrically arranged on two sides of the main fluid inlet 231, the bottom of the first lateral incision 232 and the second lateral incision 233 axially extends to the end face 234 of the outlet end 23 and divides the outlet end 23 into an inflow plate 3 and a flow baffle 4, the radial width of the inflow plate 3 is smaller than the radial width of the flow baffle 4, the height of the part of the mixer body 2 extending into the inner cavity 13 is larger than the radius of the inner cavity 13, and the inner diameter of the mixer body 22 is smaller than the inner diameter of the inner cavity 13.

Example 2:

referring to fig. 1, 2, 5 and 6, a pipe fluid mixer assembly is different from embodiment 1 in the structure:

Example 3:

referring to fig. 1, 2, 7 and 8, a pipe fluid mixer assembly is different from embodiment 1 in the structure:

the radial width of the inflow plate 3 is equal to the radial width of the baffle plate 4.

Example 4:

referring to fig. 1, 2, 9 and 10, a pipe fluid mixer assembly is different from embodiment 3 in the structure:

Example 5:

referring to fig. 1, 2, 11 and 12, a pipe fluid mixer assembly is constructed in the same manner as the embodiment in which:

the main fluid inlet 231 is a hole-like structure located above the first and second

lateral cuts

232, 233.

Example 6:

referring to fig. 1, 2, 13 and 14, a pipe fluid mixer assembly is different from embodiment 3 in the structure:

the main fluid inlet 231 is a square groove structure located above the first lateral incision 232 and the second lateral incision 233 and extending radially.

In order to examine the mixing effect of the structure of the present utility model, the device, the comparison device 1, and the comparison device 2 described in the above embodiments 1 to 3 were tested for outlet uniformity, pressure loss, and intake loss under the same conditions based on a certain type of engine, with air as the main fluid, and EGR exhaust gas as the secondary fluid. The mixer body in the comparison device 1 adopts a structure that through holes are uniformly distributed around the wall of the outlet end pipe, and the comparison device 2 is different from the device described in the embodiment 1 in that the length of the main fluid inlet 231 is shorter, that is, the area of the main fluid inlet 231 is smaller. The detection results are shown in Table 1:

table 1 mixing performance test results for mixer assemblies

	Contrast device 1	Contrast device 2	Example 1	Example 2	Example 3
						Outlet uniformity/%	86.7	97.2	97.3	97.8	95.3
Pressure loss/kpa	2.5	3.7	2.2	3.1	1.2
						Intake loss/kpa	4.2	4.5	3.1	3.9	2.6

In the above table, the pressure loss refers to the pressure loss on the EGR exhaust gas side, and the intake air loss refers to the pressure loss on the air side. The greater the exit uniformity, the higher the mixing efficiency.

As can be seen from the above data,

1. compared with the existing structure (comparison device 1) with uniformly distributed through holes in the circumference, the device can obtain higher mixing efficiency and smaller pressure loss.

2. Increasing the area of the primary fluid inlet 231 may improve mixing efficiency and reduce pressure loss to some extent.

3. The radial width of the inflow plate is smaller than the radial width of the baffle plate, so that the mixing efficiency is higher, and the radial width of the inflow plate is larger than the radial width of the baffle plate, so that the pressure loss is smaller.

Claims

1. The utility model provides a pipeline fluid mixer assembly, includes main fluid pipeline (1), blender body (2), main fluid pipeline (1) include main fluid entry end (11), mixed fluid exit end (12), blender body (2) are including secondary fluid entry end (21), blender cavity (22), the exit end (23) that communicate in proper order, exit end (23) are stretched into in inner chamber (13) of main fluid pipeline (1) by the lateral wall of main fluid pipeline (1), and offered main fluid import (231) of intercommunication blender cavity (22), inner chamber (13) on the pipe wall of blender body (2), its characterized in that:

the main fluid inlet (231) is arranged towards the main fluid inlet end (11), a first lateral incision (232) and a second lateral incision (233) for discharging premixed fluid are formed in the pipe wall of the outlet end (23), and the first lateral incision (232) and the second lateral incision (233) are both arranged towards the inner wall of the inner cavity (13) and symmetrically arranged at two sides of the main fluid inlet (231);

the main fluid inlet (231) comprises a hole-shaped part (5) and a square groove part (6), the hole-shaped part (5) is positioned above the first lateral incision (232) and the second lateral incision (233), the top end of the square groove part (6) is communicated with the bottom of the hole-shaped part (5), and the bottom end of the square groove part (6) axially extends to the position of the proximal end surface (234);

the included angle formed by the central axis of the mixer body (2) and the central axis of the main fluid pipeline (1) is 45-90 degrees.

2. A pipe fluid mixer assembly according to claim 1 wherein: the first lateral incision (232) and the second lateral incision (233) are identical in structure and are of groove-shaped structures, the bottom ends of the first lateral incision (232) and the second lateral incision (233) axially extend to the end face (234) of the outlet end (23), and the outlet end (23) is cut into an inflow plate (3) and a baffle plate (4) by the first lateral incision (232) and the second lateral incision (233).

3. A pipe fluid mixer assembly according to claim 2, wherein: the radial width of the inflow plate (3) is smaller than the radial width of the baffle plate (4).

4. A pipe fluid mixer assembly according to claim 2, wherein: the radial width of the inflow plate (3) is larger than the radial width of the baffle plate (4).

5. A pipe fluid mixer assembly according to claim 1 or 2, wherein: the height of the part of the mixer body (2) extending into the inner cavity (13) is larger than the radius of the inner cavity (13), and the inner diameter of the mixer cavity (22) is smaller than or equal to the inner diameter of the inner cavity (13).