CN216477546U

CN216477546U - Exhaust pipe acceleration structure and vacuum pump

Info

Publication number: CN216477546U
Application number: CN202220039554.2U
Authority: CN
Inventors: 谢兴; 周贤忠; 沈文武; 梁天江
Original assignee: Sichuan Leicester Vacuum Technology Co ltd
Current assignee: Sichuan Leicester Vacuum Technology Co ltd
Priority date: 2022-01-07
Filing date: 2022-01-07
Publication date: 2022-05-10
Anticipated expiration: 2032-01-07

Abstract

The utility model provides a blast pipe is structure and vacuum pump with higher speed, blast pipe is structure including intake pipe and outlet duct with higher speed. The outlet duct includes the outer tube and sets up in the inside inner tube of outer tube, and the inner tube is the taper structure that cross sectional area all reduces gradually along with gas flow direction, and the inner tube is connected with the outer tube in the less one end of cross sectional area, forms the outer annular passageway that supplies the gas outflow between outer tube and the inner tube, and outer tube one end is connected with the intake pipe, and outer tube and inner tube all communicate with the intake pipe. The utility model discloses improved blast pipe structure with higher speed, can reduce part quantity, simplified assembly process optimizes the air current way.

Description

Exhaust pipe acceleration structure and vacuum pump

Technical Field

The utility model relates to a vacuum pump field particularly, relates to an blast pipe is structure and vacuum pump with higher speed.

Background

The exhaust system functions to collect exhaust gas in each engine cylinder, reduce exhaust noise and eliminate flames and sparks in the exhaust gas, to discharge the exhaust gas safely into the atmosphere, and to perform emission control of harmful substances in the exhaust gas. Theoretically, the faster the exhaust gas produced is discharged to the atmosphere, the better, but in practice the resistance of the pipes to the flow and the frictional resistance between the flows create an exhaust back pressure. The larger the exhaust back pressure is, the larger the exhaust resistance is, and the less easily the exhaust gas is discharged.

Patent document CN1201104A discloses, for the above reasons, an apparatus for accelerating exhaust, which can accelerate the velocity of the exhaust gas flow decreased by the resistance of the exhaust system, causing the exhaust gas to be discharged into the atmosphere in an accelerated state; however, the patent requires a large number of parts, there are a minimum of two mounting surfaces that need to be sealed, assembly is not easy, and there are air flow dead corners in the device that affect flow.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a blast pipe is structure with higher speed, and it has improved the blast pipe structure with higher speed, can reduce part quantity, simplifies the assembly process, optimizes the air current route.

Another object of the utility model is to provide a vacuum pump to solve among the prior art vacuum pump the blast pipe accelerate the part quantity of structure many, be unfavorable for the assembly and have the problem at air current dead angle.

In order to achieve the purpose, the following technical scheme is adopted:

the utility model provides an exhaust pipe accelerating structure, which comprises an air inlet pipe and an air outlet pipe;

the outlet duct includes the outer tube and sets up in the inside inner tube of outer tube, and the inner tube is the taper structure that cross sectional area all reduces gradually along with gas flow direction, and the inner tube is connected with the outer tube in the less one end of cross sectional area, forms the outer annular passageway that supplies the gas outflow between outer tube and the inner tube, and the other end of outer tube is connected with the intake pipe, and outer tube and inner tube all communicate with the intake pipe.

Further, the intake pipe includes a first connecting portion and a second connecting portion.

Furthermore, the second connecting part is a cone-shaped structure with the cross section area gradually increasing along the gas flowing direction.

Furthermore, the end with the smaller cross-sectional area of the second connecting part is connected with the first connecting part, and the end with the larger cross-sectional area of the second connecting part is connected with the outer pipe.

Furthermore, the second connecting part is fixedly connected with the outer tube.

Further, the inner pipe and the outer pipe are connected by a plurality of reinforcing ribs.

Further, the reinforcing ribs are all inclined planes.

Further, gaps are arranged among the reinforcing ribs.

Further, the exhaust pipe accelerating structure is connected in series in the exhaust pipe of the vacuum pump in the air flow direction.

The utility model provides a pair of vacuum pump, this vacuum pump include foretell blast pipe structure with higher speed.

Compared with the prior art, the utility model discloses following beneficial effect has:

the utility model provides a blast pipe is structure with higher speed comprises intake pipe and outlet duct two parts, sets up the structure that reduces gradually into the cross-sectional area through the inner tube with the outlet duct, forms the outer annular passage that supplies the gas outflow between outer tube and the inner tube, with the help of the negative pressure that the air current accelerates, lets partial air current get into outer annular passage and flows out through inner tube back, discharge tube together with the gas that the inner tube flowed through. Compared with the prior art, the utility model discloses improved blast pipe structure with higher speed, can reduce part quantity, simplified assembly process optimizes the air current way, reduces the gas resistance, makes the gas flow more smooth and easy.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention, and therefore should not be considered as limiting the scope, and that those skilled in the art can also obtain other related drawings based on these drawings without inventive efforts.

FIG. 1 is a cross-sectional view of an embodiment of the present invention;

fig. 2 is a front view of an embodiment of the present invention;

FIG. 3 is a schematic view of the threaded connection between the inlet pipe and the outlet pipe according to the embodiment of the present invention;

FIG. 4 is a schematic view of a bolt connection between an inlet pipe and an outlet pipe according to an embodiment of the present invention;

FIG. 5 is a schematic view of the exhaust pipe accelerating structure and the exhaust pipe screw connection according to the embodiment of the present invention;

fig. 6 is the embodiment of the present invention, which is a schematic view of the exhaust pipe acceleration structure and the exhaust pipe clamp connection.

Reference numerals: 1, an air inlet pipe; 2-air outlet pipe; 3-a first connection; 4-a second connecting portion; 5-an outer tube; 6-inner tube; 7-reinforcing ribs; 8-jet orifice.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. The components of the embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.

Thus, the following detailed description of the embodiments of the present invention, presented in the accompanying drawings, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.

It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined or explained in subsequent figures.

In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", and the like indicate the position or positional relationship based on the position or positional relationship shown in the drawings, or the position or positional relationship which is usually placed when the product of the present invention is used, and are only for convenience of description and simplification of the description, but do not indicate or imply that the device or element referred to must have a specific position, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," "third," and the like are used solely to distinguish one from another and are not to be construed as indicating or implying relative importance.

In the description of the present invention, it should also be noted that, unless otherwise explicitly specified or limited, the terms "disposed," "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.

The technical solution of the present invention is further described in detail by the following specific embodiments in combination with the accompanying drawings:

as shown in fig. 1, an exhaust pipe accelerating structure is composed of two parts including an inlet pipe 1 and an outlet pipe 2, which are separable independent components. In the working state, the air inlet pipe 1 is connected with the air outlet pipe 2.

As shown in fig. 1, the intake pipe 1 includes a first connecting portion 3 and a second connecting portion 4. One end of the first connecting part 3 is connected with the exhaust pipe; the second connecting portion 4 is the taper structure that the cross sectional area all gradually increases along with gas flow direction, and the less one end of its cross section is connected with the 3 other ends of first connecting portion, and the great one end of 4 cross sections of second connecting portion is connected with outlet duct 2.

The first connecting portion 3 is connected to the upstream side of the exhaust pipe so that the gas from the exhaust pipe enters the exhaust pipe acceleration structure through the first connecting portion 3. The diameter of the first connecting portion 3 matches the exhaust duct specification.

When gas enters the second connection 4 from the first connection 3, the second connection 4 is of a tapered configuration which provides a progressively larger cross-sectional area with the direction of gas flow, where the gas stream expands and then flows into the outlet.

As shown in fig. 1-2, the outlet pipe 2 includes an outer pipe 5 and an inner pipe 6, the inner pipe 6 is disposed inside the outer pipe 5, the inner pipe 6 is a tapered structure whose cross-sectional area is gradually reduced along with the gas flowing direction, the inner pipe 6 is connected with the outer pipe 5 at one end with a smaller cross-sectional area, a jet orifice 8 is formed at the connection, and an outer annular passage for the gas to flow out is formed between the outer pipe 5 and the inner pipe 6. The larger one end of second connecting portion 4 cross section is connected with outer tube 5 to outer tube 5 and inner tube 6 all communicate with intake pipe 1.

When gas flows from the second connecting portion 4 to the outlet pipe 2, a part of the gas flows through the inner side of the inner pipe 6, another part of the gas flows through the outer annular passage between the outer pipe 5 and the inner pipe 6, and the two parts of the gas are collected and discharged from the injection ports 8.

The inner tube 6 is connected to the outer tube 5 at the end with the smaller cross-sectional area by a plurality of ribs 7, the ribs 7 are all inclined surfaces, and gaps are provided between the ribs 7.

The above-described fixing means not only effectively fixes the inner tube 6 inside the outer tube 5 and provides another passage for the gas flow than the inner side of the inner tube 6, thereby increasing the exhaust efficiency, but also allowing the gas flow resistance to be reduced.

In an alternative embodiment, the outer tube 5 is a conical structure with a cross-sectional area that decreases with the direction of gas flow.

In an alternative embodiment, the connection mode of the outer tube 5 and the second connection portion 4 may be a detachable fixed connection mode.

In alternative embodiments, the connection of the outer tube 5 and the second connection portion 4 may be a bolt connection, a screw connection, and a flange connection.

As shown in fig. 5 to 6, the exhaust pipe acceleration structure may be connected in series in the exhaust line of the vacuum pump.

In an alternative embodiment, the exhaust pipe accelerating structure and the exhaust pipe may be connected in a detachable and fixed manner.

In alternative embodiments, the exhaust pipe acceleration structure may be connected to the exhaust pipe by means of a clamp connection, a screw connection, and a flange connection.

The working principle of the exhaust pipe acceleration structure in the exhaust pipeline of the vacuum pump is as follows:

when gas flows from the exhaust pipe into the exhaust pipe acceleration structure, the gas is expanded at the second connection portion 4 and then flows toward the outlet pipe 2. The gas flow speed is increased here because it flows from the channel with the larger cross-section to the outlet tube 2 which is tapered. Due to the acceleration of the gas flow, a negative pressure is generated in the exhaust pipe acceleration structure, the negative pressure can attract part of the gas to flow out of the outer annular channel between the outer pipe 5 and the inner pipe 6, another path is provided for gas exhaust, and the gas is finally converged with the gas flowing out of the inner side of the inner pipe 6 and then is exhausted through the jet orifice 8.

The air flow velocity in the outer annular passage between the outer tube 5 and the inner tube 6 is low, and by means of the negative pressure effect the air flow can be brought substantially to the air flow velocity flowing out from the inner side of the inner tube 6. When the flow rates of the two portions of gas are close, the discharged gas flows are all high-speed gas flows. Not only increases the flow velocity of the exhaust airflow, but also solves the problem of airflow dead angles, and leads the gas to flow more smoothly.

Example 1

As shown in fig. 3, the exhaust pipe acceleration structure of the present embodiment includes an intake pipe 1 and an exhaust pipe 2.

The intake pipe 1 includes a first connecting portion 3 and a second connecting portion 4 connected thereto. The first connecting part 3 is connected with the exhaust pipe, and the diameter of the pipeline of the first connecting part is matched with the specification of the connected exhaust pipe; the second connecting part 4 is designed into a conical structure, the end with the smaller cross section is connected with the first connecting part 3, and the end with the larger cross section is connected with the air outlet pipe 2.

The outlet pipe 2 comprises an outer pipe 5 and an inner pipe 6, the inner pipe 6 is arranged inside the outer pipe 5, the cross section area of the inner pipe 6 is gradually reduced along with the flowing direction of gas, the inner pipe 6 is connected with the outer pipe 5 at one end with a smaller cross section area, a jet orifice 8 is formed at the connection part, and an outer annular channel for the gas to flow out is formed between the outer pipe 5 and the inner pipe 6. The larger one end of second connecting portion 4 cross section is connected with outer tube 5 to outer tube 5 and inner tube 6 all communicate with intake pipe 1.

Wherein, the connection mode of the outer tube 5 and the second connection part 4 is threaded connection. Specifically, an external thread is provided at the end of the second connection portion 4 where the cross-sectional area is large, and an internal thread is provided at the end of the outer tube 5 where the air inlet is connected.

Example 2

As shown in fig. 4, the exhaust pipe acceleration structure of the present embodiment includes an intake pipe 1 and an exhaust pipe 2.

The outer pipe 5 and the second connecting part 4 are connected by bolts. Specifically, a screw is provided at the end of the second connecting portion 4 having a large cross-sectional area, and a through hole matched with the screw in position and specification is provided at the end of the outer tube 5 connected to the intake tube. During the operating condition, insert the through-hole with the screw rod correspondence, reuse the nut of adapted with intake pipe 1 and outlet duct 2 fastening connection.

Example 3

This embodiment is a vacuum pump including an exhaust pipe acceleration structure, which adopts embodiment 1.

The exhaust pipe accelerating structure is connected in series in the exhaust pipeline along the gas flowing direction, and the two ends of the exhaust pipe accelerating structure are connected with the exhaust pipe in a threaded manner, as shown in fig. 5.

Example 4

The exhaust pipe accelerating structure is connected in series in the exhaust pipeline along the gas flowing direction, and the two ends of the exhaust pipe accelerating structure are connected with the exhaust pipe in a clamping manner, as shown in fig. 6.

The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. An exhaust pipe acceleration structure is characterized by comprising an air inlet pipe and an air outlet pipe;

the outlet duct includes the outer tube and sets up in the inside inner tube of outer tube, the inner tube is the taper structure that cross sectional area all reduces along with gas flow direction gradually, the inner tube in the less one end of cross sectional area with the outer tube is connected, the outer tube with form the outer annular passageway that supplies the gas outflow between the inner tube, the other end of outer tube with the intake pipe is connected, just the outer tube with the inner tube all with the intake pipe intercommunication.

2. The exhaust pipe acceleration structure according to claim 1, characterized in that the intake pipe includes a first connection portion and a second connection portion.

3. The exhaust pipe accelerating structure according to claim 2, wherein the second connecting portion is a tapered structure in which the cross-sectional area is gradually increased in the gas flow direction.

4. The exhaust pipe acceleration structure according to claim 3, characterized in that an end of the second connection portion, which has a smaller cross-sectional area, is connected to the first connection portion, and an end of the second connection portion, which has a larger cross-sectional area, is connected to the outer pipe.

5. The exhaust pipe acceleration structure according to claim 4, characterized in that the second connecting portion is fixedly connected to the outer pipe.

6. The exhaust pipe accelerating structure according to claim 1, wherein the inner pipe and the outer pipe are connected by a plurality of reinforcing ribs.

7. The exhaust pipe accelerating structure according to claim 6, wherein the plurality of reinforcing ribs are each a slant surface.

8. The exhaust pipe accelerating structure according to claim 7, wherein a gap is provided between the reinforcing ribs.

9. The exhaust pipe acceleration structure according to claim 1, characterized in that the exhaust pipe acceleration structure is connected in series in an exhaust pipe of a vacuum pump in a gas flow direction.

10. A vacuum pump characterized by comprising the exhaust pipe acceleration structure according to any one of claims 1 to 9.