CN213580009U

CN213580009U - Reducing device and wind tunnel spray pipe

Info

Publication number: CN213580009U
Application number: CN202022884811.6U
Authority: CN
Inventors: 董世强; 王超; 宋昆; 孔祥蒙; 付宝琨; 安井兰
Original assignee: Himile Mechanical Manufacturing Co Ltd
Current assignee: Himile Mechanical Manufacturing Co Ltd
Priority date: 2020-12-04
Filing date: 2020-12-04
Publication date: 2021-06-29
Anticipated expiration: 2030-12-04

Abstract

The utility model discloses a reducing device and a wind tunnel spray pipe, which belong to the field of wind tunnel test equipment and comprise a thin-wall inner shell and an outer shell, wherein the thin-wall inner shell is arranged in the outer shell, and the calibers of the two ends of the thin-wall inner shell and the two ends of the outer shell are different, so that the reducing device is suitable for rectangular spray pipes and mixing chambers of different models; because the temperature rise is caused in the variable-diameter section in the wind tunnel test, a cooling cavity is arranged between the thin-wall inner shell and the outer shell and is communicated with a circulating cooling system, so that the thin-wall inner shell is cooled, and the service life of the whole equipment is prevented from being influenced; the wall thickness of thin wall inner shell often thins its cooling effect better more, but too thinly can influence the structural strength of thin wall inner shell, consequently the utility model discloses thin wall inner shell surface that is located the cooling intracavity is equipped with a plurality of slots and improves thin wall inner shell overall structure intensity for the thin wall inner shell can have the thin part of wall to play good cooling effect, can guarantee overall structure intensity again, thereby satisfies and carries out work under the high pressure.

Description

Reducing device and wind tunnel spray pipe

Technical Field

The utility model relates to a wind-tunnel test equipment field, concretely relates to reducing device and wind-tunnel spray tube.

Background

The wind tunnel spray pipe products in the wind tunnel test have more structure types, mainly including binary type and axisymmetric type. Binary type spray tube entry and exit cross-section are the rectangle, the axisymmetric type cross-section is mostly circular, front end access connection mixing chamber structure when two kinds of spray tubes in-service use, because the mixing chamber is the commonality structure, the design bore is unanimous with the axisymmetric spray tube, the reuse is connected the inconsistent and reverse step that exists of rectangle spray tube bore, influence the normal use of spray tube, need design a reducing device between mixing chamber and rectangle spray tube, because operational environment needs, reducing section device need exist water circulative cooling system, however it requires whole length can not exceed 100mm, a series of difficult problems such as connection and sealed will exist to both ends face like this.

In view of the problems existing in the prior art, the utility model discloses combine many years' design and experience of use in relevant field, assisted by too strong professional knowledge, designed and manufactured a reducing device and wind-tunnel spray tube, overcome above-mentioned defect.

SUMMERY OF THE UTILITY MODEL

To the problem that exists among the prior art, the utility model provides a pair of reducing device and wind-tunnel spray tube has avoided the production of reverse step, has guaranteed the cooling effect of this section.

In order to realize the purpose, the utility model discloses a technical scheme as follows: a diameter-changing device comprises a thin-wall inner shell and an outer shell, wherein the calibers of two ends of the thin-wall inner shell and the outer shell are different;

a cooling cavity is arranged between the thin-wall inner shell and the outer shell and is communicated with a circulating cooling system;

and a plurality of grooves are formed in the outer surface of the thin-wall inner shell positioned in the cooling cavity.

Preferably, the circulating cooling system comprises a water inlet pipe and a water outlet pipe, and the water inlet pipe and the water outlet pipe penetrate through the shell to be communicated with the cooling cavity.

Preferably, the water inlet pipe comprises a water inlet collecting pipe and a water inlet distribution pipe, the water inlet collecting pipe is provided with a plurality of water inlet pipe joints for externally connecting cooling water, and the water inlet distribution pipe penetrates through the shell and is connected with the water inlet collecting pipe and the cooling cavity;

the water outlet pipe comprises a water outlet collecting pipe and a water outlet distribution pipe, the water outlet collecting pipe is provided with a plurality of water outlet pipe joints, and the water outlet distribution pipe penetrates through the shell and is connected with the water outlet collecting pipe and the cooling cavity;

the water inlet collecting pipe and the water outlet collecting pipe are distributed around the shell.

Preferably, the grooves comprise a plurality of axial grooves and a plurality of annular grooves, and the circumferences of the axial grooves are uniformly distributed on the outer wall of the thin-wall inner shell.

Preferably, the two axial grooves correspond to the positions of the water inlet distribution pipe and the water outlet distribution pipe respectively.

Preferably, the groove depth of the grooves is 3mm-5mm, the width of the annular grooves is 5mm-8mm, and the rib width between the two annular grooves is 2mm-3 mm.

Preferably, the thin-wall inner shell is made of oxygen-free copper forging.

Preferably, the thin-wall inner shell and the outer shell are welded in a vacuum diffusion welding mode.

Preferably, the two ends of the shell are of flange structures, and the two ends of the shell are provided with a sealing groove and a plurality of threaded connecting holes.

A wind tunnel spray pipe comprises a mixing chamber, a rectangular spray pipe and the diameter-changing device, wherein the diameter-changing device is connected with the mixing chamber and the rectangular spray pipe.

The utility model discloses an useful part lies in:

(1) the utility model discloses an above-mentioned reducing structure, avoided the mixing chamber directly to be connected the problem that the reverse step that appears influences wind-tunnel test data with the rectangle spray tube, the rectangle spray tube of different models can realize connecting through the bore that changes the reducing device access & exit, makes the commonality of mixing chamber become more extensive, has practiced thrift the cost of producing multiple specification mixing chamber, and utilizes circulative cooling system, has guaranteed that the temperature of this section is in control range.

(2) The utility model discloses a vacuum diffusion welding can fully guarantee the leakproofness of thin wall inner shell and shell, has replaced traditional connection of dismantling and has carried out the structure sealed with the help of rubber seal, need not worry that the high rubber seal who leads to of spray tube temperature is longe-lived, changes the problem frequently high.

(3) The utility model discloses a thin wall inner shell can guarantee good cooling effect more easily with the help of circulative cooling system, can improve the overall structure intensity of thin wall inner shell with the help of the slot simultaneously, has guaranteed that it can carry out work under high pressure.

Drawings

FIG. 1 is a front view of a reducing device;

FIG. 2 is a cross-sectional view of a reducing device;

fig. 3 is a schematic structural diagram of a wind tunnel nozzle.

In the figure: 1-diameter changing device, 2-mixing chamber, 3-rectangular spray pipe, 11-outer shell, 12-thin wall inner shell, 13-cooling cavity, 14-water outlet diversion pipe, 15-water outlet manifold, 16-water outlet pipe joint, 17-water inlet diversion pipe, 18-water inlet manifold and 19-water inlet pipe joint.

Detailed Description

In order to facilitate understanding for those skilled in the art, the present invention will be further described with reference to the accompanying drawings.

As shown in fig. 1 to 3, a diameter-variable device is specifically applied between a mixing chamber 2 and a rectangular nozzle 3 in a wind tunnel test, so as to avoid the problem that the wind tunnel test data is affected by a reverse step which is generated when the mixing chamber 2 is directly connected with the rectangular nozzle 3; and the rectangular spray pipes 3 of different models can be connected by changing the caliber of the inlet and outlet of the reducing device 1, so that the universality of the mixing chamber 2 becomes wider, and the cost for producing the mixing chambers 2 of various specifications is saved.

The mixing device specifically comprises a thin-wall inner shell 12 and an outer shell 11, wherein the thin-wall inner shell 12 is arranged in the outer shell 11, and the calibers of two ends of the thin-wall inner shell 12 and two ends of the outer shell 11 are different, so that the mixing device is suitable for rectangular spray pipes 3 and mixing chambers 2 of different types;

because the temperature rise can be caused in the reducing section in the wind tunnel test, the reducing device 1 of the utility model is provided with the cooling cavity 13 between the thin-wall inner shell 12 and the outer shell 11, and the cooling cavity 13 is communicated with the circulating cooling system, thereby cooling the thin-wall inner shell 12 and avoiding the influence on the service life of the whole equipment;

as is well known, the wall thickness of thin wall inner shell 12 is often thinner its cooling effect better, but too thin will influence the structural strength of thin wall inner shell 12, consequently the utility model discloses thin wall inner shell 12 surface that is located cooling chamber 13 is equipped with a plurality of slots and improves thin wall inner shell 12 overall structure intensity for thin wall inner shell 12 can have the thin part of wall to play good cooling effect, can guarantee overall structure intensity again, thereby satisfies and carries out work under the high pressure.

The utility model discloses circulative cooling system includes inlet tube and outlet pipe, and inlet tube and outlet pipe pass shell 11 and cooling chamber 13 intercommunication, because whole reducing device 1's length often can not exceed 100mm, in order to improve the cooling effect, the utility model discloses specifically realize through following structure:

the water inlet pipe comprises a water inlet collecting pipe 18 and a water inlet and distribution pipe 17, the water inlet collecting pipe 18 is provided with a plurality of water inlet pipe joints 19 for externally connecting cooling water, and the water inlet and distribution pipe 17 penetrates through the shell 11 and is connected with the water inlet collecting pipe 18 and the cooling cavity 13; the water outlet pipe comprises a water outlet collecting pipe 15 and a water outlet distribution pipe 14, the water outlet collecting pipe 15 is provided with a plurality of water outlet pipe joints 16, and the water outlet distribution pipe 14 penetrates through the shell 11 and is connected with the water outlet collecting pipe 15 and the cooling cavity 13; for reducing the space, the utility model discloses inlet manifold 18 and outlet manifold 15 distribute around shell 11, the utility model discloses inlet pipe joint 19 and outlet pipe joint 16 quantity are preferred all to be set to threely, and separate 60 on inlet manifold 18 and outlet manifold 15 respectively, and both tip set up sealed screw and conveniently are connected with external equipment.

Because a single water inlet pipe joint 19 and a single water outlet pipe joint 16 cannot meet the cooling water flow of the reducing device 1, a plurality of water inlet pipe joints 19 and a plurality of water outlet pipe joints 16 are respectively arranged on the water inlet manifold 18 and the water outlet manifold 15, so that enough water confluence and rapid discharge are ensured, and the water inlet distribution pipe 17 and the water outlet distribution pipe 14 on the shell 11 are limited by the size of the shell 11 and the structural strength of the shell 11, so that only one structure is arranged, and the quantity of the water inlet distribution pipe 17 and the water outlet distribution pipe 14 can be properly added on the basis of meeting the integral structural strength of the shell 11 to further improve the cooling effect.

The utility model discloses a slot includes a plurality of axial slots and a plurality of annular groove, and a plurality of axial slot circumference equipartitions are on 12 outer walls of thin wall inner shell, and wherein twice axial slot corresponds respectively into distributive pipe 17 and goes out distributive pipe 14 positions, makes things convenient for the cooling water to get into the slot fast, and the groove depth of slot is 3mm-5mm, preferably 4mm, and annular groove's width is 5mm-8mm, preferably 6mm, and the rib width between two annular grooves is 2mm-3mm, preferably 2 mm.

The utility model discloses thin wall inner shell 12 establishes to the good anaerobic copper forging of radiating effect, and the influence of connecting to rubber seal is dismantled to the tradition of avoiding the high temperature of spray tube to lead to, the utility model discloses adopt vacuum diffusion welding mode welding between thin wall inner shell 12 and the shell 11 to this leakproofness of welding seam between improvement thin wall inner shell 12 and the shell 11.

The utility model provides a wind-tunnel spray tube, includes mixing chamber 2, rectangle spray tube 3 and above-mentioned reducing device 1, the utility model discloses 11 both ends of shell are established to the flange structure, and 11 both ends of shell are equipped with seal groove and a plurality of threaded connection hole, through 1 sealing connection of above-mentioned structure reducing device between mixing chamber 2 and rectangle spray tube 3.

It should be understood that these examples are for illustrative purposes only and are not intended to limit the scope of the present invention. Furthermore, it should be understood that various changes, modifications and/or alterations to the present invention may be made by those skilled in the art after reading the technical disclosure of the present invention, and all such equivalents may fall within the scope of the present invention as defined by the appended claims.

Claims

1. A reducing device is characterized in that: the device comprises a thin-wall inner shell and an outer shell, wherein the calibers of two ends of the thin-wall inner shell and the outer shell are different;

2. The reducing device according to claim 1, wherein: the circulating cooling system comprises a water inlet pipe and a water outlet pipe, and the water inlet pipe and the water outlet pipe penetrate through the shell and are communicated with the cooling cavity.

3. The reducing device according to claim 2, wherein: the water inlet pipe comprises a water inlet collecting pipe and a water inlet distribution pipe, a plurality of water inlet pipe joints are arranged on the water inlet collecting pipe and externally connected with cooling water, and the water inlet distribution pipe penetrates through the shell and is connected with the water inlet collecting pipe and the cooling cavity;

4. The reducing device according to claim 3, wherein: the grooves comprise a plurality of axial grooves and a plurality of annular grooves, and the circumferences of the axial grooves are uniformly distributed on the outer wall of the thin-wall inner shell.

5. The reducing device according to claim 4, wherein: the two axial grooves respectively correspond to the positions of the water inlet distributive pipe and the water outlet distributive pipe.

6. The reducing device according to claim 4, wherein: the groove depth of the grooves is 3mm-5mm, the width of the annular grooves is 5mm-8mm, and the rib width between the two annular grooves is 2mm-3 mm.

7. The reducing device according to claim 1, wherein: and the thin-wall inner shell is made into an oxygen-free copper forging.

8. The reducing device according to claim 1, wherein: and the thin-wall inner shell and the outer shell are welded in a vacuum diffusion welding mode.

9. The reducing device according to claim 1, wherein: the two ends of the shell are of flange structures, and the two ends of the shell are provided with a sealing groove and a plurality of threaded connecting holes.

10. A wind tunnel nozzle, characterized by: comprising a mixing chamber, a rectangular nozzle and a diameter-changing device according to any one of claims 1 to 9, said diameter-changing device connecting said mixing chamber and said rectangular nozzle.