CN108704503B

CN108704503B - Venturi type mixer

Info

Publication number: CN108704503B
Application number: CN201810524871.1A
Authority: CN
Inventors: 李伟明
Original assignee: Foshan City Gaoming District Yanghe Metal Material Professional Town Technology Innovation Center
Current assignee: Foshan City Gaoming District Yanghe Metal Material Professional Town Technology Innovation Center
Priority date: 2018-05-28
Filing date: 2018-05-28
Publication date: 2021-02-26
Anticipated expiration: 2038-05-28
Also published as: CN108704503A

Abstract

The invention discloses a Venturi type mixer which comprises a contraction section, a throat pipe and an expansion section, wherein the throat pipe comprises an outer pipe and an inner pipe which are coaxially arranged, two ends of an inner cavity enclosed by the outer pipe and the inner pipe are respectively provided with an annular plate, and the outer pipe is provided with at least one inlet pipe; a fluid director is arranged in the inner pipe, the fluid director comprises a mandrel, and N fins are arranged on the outer wall of the mandrel at equal angles along the circumferential direction; n rows of through holes are formed in the wall of the inner pipe at equal angles along the circumferential direction, and each row of through holes point to the space between two adjacent fins; and N is an integer greater than or equal to 3. The Venturi type mixer provided by the invention realizes that the first fluid is evenly distributed into N strands after reaching the inner pipe; and the second fluid enters the inner tube after passing through the through holes of the inner tube and is correspondingly divided into N rows, so that the two fluids are uniformly mixed immediately after being converged in the inner tube.

Description

Venturi type mixer

Technical Field

The invention relates to the technical field of fluid mixing equipment, in particular to a Venturi type mixer.

Background

Venturi mixers are widely used in industry to bring two fluids together quickly and achieve initial mixing. However, in actual production, sometimes the two fluids are mixed and then chemically reacted immediately (e.g., chlorine and propylene are mixed at high temperature and then chlorinated quickly and for only a few seconds). In the prior art, two fluids are only preliminarily mixed after being converged in a throat of a venturi, and if the two fluids are mixed and then react rapidly, the reaction effect is general, the yield is influenced, and economic loss is caused.

It is seen that improvements and enhancements to the prior art are needed.

Disclosure of Invention

In view of the above-mentioned shortcomings of the prior art, the present invention aims to provide a venturi mixer, which is intended to solve the technical problem that the venturi mixer in the prior art cannot sufficiently mix two fluids.

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

a Venturi type mixer comprises a contraction section, a throat pipe and an expansion section which are connected in sequence, wherein the throat pipe comprises an outer pipe and an inner pipe which are coaxially arranged, two ends of an inner cavity enclosed by the outer pipe and the inner pipe are respectively provided with an annular plate, the outlet end of the contraction section is welded with the corresponding annular plate, and the inlet end of the expansion section is welded with the corresponding annular plate; the outer pipe is provided with at least one inlet pipe; a fluid director is arranged in the inner pipe, the fluid director comprises a mandrel, and N fins are arranged on the outer wall of the mandrel at equal angles along the circumferential direction; n rows of through holes are formed in the wall of the inner pipe at equal angles along the circumferential direction, and each row of through holes point to the space between two adjacent fins; and N is an integer greater than or equal to 3.

In the Venturi type mixer, each row of through holes respectively comprise a plurality of through holes distributed along the length direction of the inner pipe, and the distance between any two adjacent through holes in the same row of through holes is equal; the size of each through hole is equal.

In the Venturi type mixer, each through hole is a taper hole with a large outer part and a small inner part.

In the Venturi type mixer, the cross section of each fin is an isosceles triangle, and the bottom edge of the isosceles triangle is connected with the mandrel.

In the Venturi type mixer, 4 inlet pipes are connected to the outer pipe, and in the projection perpendicular to the plane of the outer pipe, the included angle between any two adjacent inlet pipes is 90 degrees.

In the venturi mixer, each inlet pipe is located at the middle of the outer pipe in the length direction.

In the Venturi type mixer, the inlet end of each inlet pipe is connected with a flange respectively.

In said venturi mixer, said N equals 16.

In the Venturi type mixer, 3 fins in the fluid director are connected with the inner pipe in a welding mode.

Has the advantages that:

the invention provides a Venturi type mixer, compared with the prior art, the throat pipe is arranged into an outer pipe and an inner pipe, a fluid director is arranged in the inner pipe, and the pipe wall of the inner pipe is provided with a through hole, so that in actual use, a first fluid is evenly distributed into N strands after reaching the inner pipe; the second fluid enters the inner tube after passing through the through hole of the inner tube and is correspondingly divided into N rows, and each row of the second fluid is mixed with one corresponding strand of the first fluid, so that the mixing uniformity is improved, and the two fluids are uniformly mixed immediately after being converged in the inner tube.

Drawings

Fig. 1 is a front view of a venturi mixer provided by the present invention.

FIG. 2 is a schematic view of the structure of the throat and flow director in the Venturi mixer according to the present invention.

Fig. 3 is a sectional view taken along line a-a of fig. 1.

Fig. 4 is a partially enlarged view of the area S1 in fig. 2.

Fig. 5 is a partially enlarged view of the area S2 in fig. 3.

FIG. 6 is a front view of the inner tube of the Venturi mixer provided in the present invention.

Detailed Description

The present invention provides a venturi mixer, and in order to make the objects, technical solutions and effects of the present invention clearer and clearer, the present invention will be further described in detail below with reference to the accompanying drawings and examples. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

Referring to fig. 1 to 6, the present invention provides a venturi mixer. For ease of understanding, the position of the inner tube is schematically drawn with a dotted line in fig. 1, but the inner tube cannot be directly observed from the outside. The dashed arrows in fig. 4 are illustrated as the first fluid and the solid arrows are illustrated as the second fluid. The drawings are only for explaining the structural principle of the venturi mixer and are not to scale with the actual product.

The Venturi type mixer comprises a contraction section 1, a throat pipe 2 and an expansion section 3 which are connected in sequence, wherein the throat pipe 2 comprises an outer pipe 21 and an inner pipe 22 which are coaxially arranged, two ends of an inner cavity enclosed by the outer pipe 21 and the inner pipe 22 are respectively provided with an annular plate 4 (namely, the two ends of the inner cavity are not communicated with the outside), the outlet end of the contraction section is welded with the corresponding annular plate, and the inlet end of the expansion section is welded with the corresponding annular plate, so that the inner pipe 22 is respectively communicated with the contraction section 1 and the expansion section 3. The outer tube 21 is provided with at least one inlet tube 7; a fluid director is arranged in the inner pipe 22, the fluid director comprises a mandrel 51, the mandrel and the inner pipe are coaxially arranged, and N fins 52 are arranged on the outer wall of the mandrel 51 at equal angles along the circumferential direction; the wall of the inner tube 22 is provided with N rows of through holes 221 at equal angles along the circumferential direction, and each row of through holes points to the space between two adjacent fins (as shown in fig. 3); and N is an integer greater than or equal to 3. The outer pipe and the inner pipe are respectively connected with the corresponding annular plate preferably in a welding mode.

When in actual use, the first fluid passes through the inner pipe from the inlet end of the contraction section in sequence; due to the blocking of a mandrel of the flow guider and the guiding of each fin, the first fluid is uniformly divided into N first fluids in the inner pipe; the second fluid enters an inner cavity formed by the outer pipe and the inner pipe from the inlet pipe, then passes through N rows of through holes on the inner pipe and enters the inner pipe, namely the second fluid is divided into N rows of second fluids, and each row of second fluids just face one strand of first fluid, so that the first fluid and the second fluid can be fully mixed in the inner pipe, and the requirement of rapid reaction after mixing of the two fluids (such as chlorine and propylene) can be met.

Specifically, referring to fig. 6, each row of through holes respectively includes a plurality of through holes 221 distributed along the length direction of the inner tube, and the distance between any two adjacent through holes 221 in the same row of through holes is equal; the size of each through hole is equal. The through holes in the inner pipe are uniformly formed by the arrangement, and the specifications of the through holes are the same, so that the second fluid can uniformly pass through the pipe wall of the inner pipe and enter the inner cavity of the inner pipe to be mixed with the first fluid.

Further, as shown in fig. 5, each through hole 221 is a taper hole with a large outer portion and a small inner portion. The 'outer large and inner small' means that the large-diameter end of the taper hole corresponds to the outer wall of the inner pipe, and the small-diameter end of the taper hole corresponds to the inner wall of the inner pipe.

Further, referring to fig. 5, the cross section of each fin 52 is an isosceles triangle, and the bottom side of the isosceles triangle is connected to the mandrel, i.e., the bottom side of the isosceles triangle corresponds to the root of the fin. It will be appreciated that the base of each fin may be arranged to have a curvature that matches the curvature of the mandrel for ease of connection. Such an arrangement allows the space in the inner tube near the mandrel to be relatively small and the space far from the mandrel to be relatively large, so that each of the first fluids is as close as possible to the through-hole, facilitating mixing with the second fluid. Preferably, the length of the mandrel is equal to or slightly shorter than the length of the inner tube.

Preferably, as shown in fig. 1, 4 inlet pipes 7 are connected to the outer pipe (only 3 inlet pipes are observed in the view of fig. 1), and the included angle between any two adjacent inlet pipes is 90 degrees in the projection perpendicular to the plane of the outer pipe. The arrangement is such that the second fluid can both enter the cavity enclosed by the outer tube and the inner tube with the ground.

Preferably, each inlet pipe 7 is located in the middle of the outer pipe 21 in the length direction, and the first fluid can be rapidly and uniformly distributed in the circumferential direction and the length direction after entering the cavity defined by the outer pipe and the inner pipe.

Further, to facilitate connection to external pipes, a flange 71 is connected to the inlet end of each inlet pipe 71.

Preferably, N is equal to 16, which arrangement is capable of functioning both as a subdivision, dividing the first fluid into 16 strands and the second fluid into 16 columns, improving the uniformity of mixing, while ensuring that the processing difficulties do not increase significantly.

In actual manufacturing, the fin 52 and the mandrel 51 may be integrally formed or may be connected by welding.

Furthermore, 3 fins in the fluid director are connected with the inner tube in a welding mode. Namely, after the fluid director is arranged in the inner tube and the angle is adjusted, the fluid director can be fixed only by respectively performing spot welding between the two ends of the three fins and the inner tube (16 fins are not required to be welded with the inner tube), and the welding workload is reduced. Preferably, the included angle between any two of the 3 fins for welding with the inner tube is 120 degrees, so as to ensure the stability of connection.

It should be noted that the venturi mixer of the present invention mainly consists of the improvement of the throat and the flow guider, and therefore, the specific structure, size and other characteristics of the contraction section and the expansion section are not limited. In addition, in practical application, the parts such as the contraction section, the expansion section, the throat pipe, the fluid director and the like are usually made of carbon steel or stainless steel, the service life is long, and the Venturi mixer is mainly used for treating non-corrosive fluid, so the fluid director does not need to be replaced during the service period of the Venturi mixer, the contraction section, the expansion section and the throat pipe can be connected through welding, the manufacturing cost is saved, and the structure of the Venturi mixer is compact.

It should be understood that equivalents and modifications of the technical solution and inventive concept thereof may occur to those skilled in the art, and all such modifications and alterations should fall within the protective scope of the present invention.

Claims

1. A Venturi type mixer comprises a contraction section, a throat pipe and an expansion section which are connected in sequence, and is characterized in that the throat pipe comprises an outer pipe and an inner pipe which are coaxially arranged, two ends of an inner cavity enclosed by the outer pipe and the inner pipe are respectively provided with an annular plate, the outlet end of the contraction section is welded with the corresponding annular plate, and the inlet end of the expansion section is welded with the corresponding annular plate; the outer pipe is provided with at least one inlet pipe; a fluid director is arranged in the inner tube, the fluid director comprises a mandrel, N fins are arranged on the outer wall of the mandrel at equal angles along the circumferential direction, the cross section of each fin is an isosceles triangle, and the bottom side of the isosceles triangle is connected with the mandrel; n rows of through holes are formed in the wall of the inner pipe at equal angles along the circumferential direction, and each row of through holes point to the space between two adjacent fins; and N is an integer greater than or equal to 3.

2. The venturi mixer of claim 1, wherein each row of through holes comprises a plurality of through holes distributed along the length direction of the inner tube, and the distance between any two adjacent through holes in the same row of through holes is equal; the size of each through hole is equal.

3. The venturi mixer of claim 2, wherein each through hole is a tapered hole with a large outside and a small inside.

4. The venturi mixer of claim 1, wherein 4 inlet pipes are connected to the outer pipe, and an angle between any two adjacent inlet pipes is 90 degrees in a projection perpendicular to a plane of the outer pipe.

5. The venturi mixer of claim 1, wherein each inlet tube is located in a middle portion of the length of the outer tube.

6. The venturi mixer of claim 5, wherein a flange is attached to the inlet end of each inlet tube.

7. The venturi mixer of claim 1, wherein N is equal to 16.

8. The venturi mixer of claim 1, wherein 3 fins of the flow director are welded to the inner tube.