A vibration reduction pipe insertion loss test bench

Abstract

The present invention relates to a vibration damping pipe insertion loss test bench, which belongs to the field of vibration and noise control technology. The test bench includes a first base body and a second base body that are fixedly arranged; a first coaxial hard tube and a second hard tube, one end of the first hard tube is fixedly connected to the first base body, one end of the second hard tube is fixedly connected to the second base body, and the first hard tube and the second hard tube are arranged opposite to each other; an excitation flange, the excitation flange is arranged between the first hard tube and the second hard tube, and the distance between the excitation flange and the other end of the first hard tube and the other end of the second hard tube is the same; a branch pipe is connected to the first hard tube and / or the second hard tube. Through this structure, when the bench provided by the present application is used, the consistency of the length of the vibration damping pipe can be ensured, thereby eliminating the measurement error caused by the difference in measurement boundary conditions caused by the difference in the length of the vibration damping pipe. Therefore, the vibration damping pipe insertion loss test bench can obtain more accurate vibration damping pipe insertion loss experimental data, and the measurement results are more accurate.

Description

Technical Field

[0001] The invention belongs to the technical field of vibration and noise control, and in particular relates to a vibration reduction pipe insertion loss test bench. Background Art

[0002] The vibration-damping nozzle is a vibration-damping element used to reduce vibration between equipment and pipelines, and between pipelines. The effect of the vibration-damping nozzle is usually evaluated by insertion loss. The insertion loss is obtained by comparing the steel pipe and the vibration-damping nozzle. When measuring, the boundary conditions of the vibration-damping nozzle should remain completely consistent. The traditional insertion loss test bench is to install the vibration-damping nozzle on a simulation test system containing equipment and pipelines. However, the existing insertion loss test bench has a large measurement error. Summary of the invention

[0003] The invention provides a vibration-damping pipe insertion loss test bench, which is used to solve the technical problem that a large measurement error exists in the process of measuring the vibration-damping pipe by the insertion loss test bench in the prior art.

[0004] The present invention is implemented by the following technical solution: a first seat body and a second seat body, wherein the first seat body and the second seat body are arranged opposite to each other;

[0005] A first hard tube and a second hard tube, the first hard tube and the second hard tube are located between the first seat body and the second seat body and are coaxially arranged, wherein one end of the first hard tube is fixedly connected to the first seat body, and one end of the second hard tube is fixedly connected to the second seat body;

[0006] A vibration excitation flange connected to the vibration exciter, the vibration excitation flange is arranged between the other end of the first rigid tube and the other end of the second rigid tube, and a spacer for connecting a vibration damping pipe is respectively arranged between the other end of the first rigid tube and the other end of the second rigid tube;

[0007] The first hard tube and / or the second hard tube is connected with a branch tube for injecting high-pressure liquid.

[0008] Furthermore, in order to better implement the present invention, a pull rod is further included, and two ends of the pull rod are detachably fixedly connected to the first seat body and the second seat body respectively.

[0009] Furthermore, in order to better implement the present invention, both ends of the pull rod are studs, and through holes are provided on the first seat body and the second seat body. The two ends of the pull rod pass through the through holes on the first seat body and the through holes on the second seat body respectively and then are screwed with nuts.

[0010] Furthermore, in order to better implement the present invention, there are multiple pull rods.

[0011] Furthermore, in order to better realize the present invention, a first flange is provided at one end of the first rigid tube close to the first seat body, and the first flange is removably fixedly connected to the first seat body by a first screw, and a second flange is provided at one end of the second rigid tube close to the second seat body, and the second flange is removably fixedly connected to the second seat body by a second screw.

[0012] Furthermore, in order to better implement the present invention, one end of the first hard tube close to the first seat body and one end of the second hard tube close to the second seat body are both sealed.

[0013] Furthermore, in order to better realize the present invention, a third flange is provided at one end of the first rigid tube away from the first seat body, and the third flange is detachably fixedly connected to the first vibration-damping tube to be tested by a third screw; a fourth flange is provided at one end of the second rigid tube away from the second seat body, and the fourth flange is detachably fixedly connected to the second vibration-damping tube to be tested by a fourth screw.

[0014] Furthermore, in order to better implement the present invention, both the first rigid tube and the second rigid tube are steel tubes.

[0015] Furthermore, in order to better implement the present invention, the branch pipe includes a stamping pipe and a pressure relief pipe, and the stamping pipe and the pressure relief pipe are both connected to the first hard pipe.

[0016] Furthermore, in order to better implement the present invention, the distance between the other end of the first rigid tube and the vibration excitation flange is the same as the distance between the other end of the second rigid tube and the vibration excitation flange.

[0017] Compared with the prior art, the present invention has the following beneficial effects:

[0018] The vibration-damping tube insertion loss test bench provided by the present invention comprises a first base body and a second base body which are fixedly arranged, a first hard tube and a second hard tube are fixedly arranged on the first base body and the second base body respectively, the first hard tube and the second hard tube are coaxial and directly opposite, a vibration-exciting flange for connecting with a vibration exciter is arranged between the first hard tube and the second hard tube, and a spacing between the vibration-exciting flange and the other end of the first hard tube and a spacing between the vibration-exciting flange and the other end of the second hard tube are respectively arranged for connecting the vibration-damping tube, and a branch pipe for facilitating the injection of high-pressure liquid is connected to the first hard tube and / or the second hard tube, so that when measuring the insertion loss of the vibration-damping tube, the first vibration-damping tube to be tested is connected between the vibration-exciting flange and the first hard tube and the first vibration-damping tube is connected to the first hard tube, and the second vibration-damping tube to be tested is connected between the vibration-exciting flange and the first hard tube and the first vibration-damping tube is connected to the first hard tube. The pipe is connected between the excitation flange and the second hard pipe and makes the second vibration-damping pipe conductive with the second hard pipe. High-pressure liquid is injected through the branch pipe, and the high-pressure liquid will enter the first vibration-damping pipe and the second vibration-damping pipe, and relevant data can be obtained through the action of the excitation flange. This structure has the advantages of simple structure and low cost. Moreover, the length of the first vibration-damping pipe and the second vibration-damping pipe is constrained by the structural setting, and when the pressure changes, the length of the first vibration-damping pipe and the second vibration-damping pipe will not change due to the distance limitation. Therefore, the measurement error caused by the difference in measurement boundary conditions caused by the difference in the length of the vibration-damping pipe is eliminated. Therefore, the vibration-damping pipe insertion loss test bench can obtain more accurate vibration-damping pipe insertion loss test data, and the measurement result is more accurate. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0020] Figure 1 It is a structural schematic diagram of the vibration reduction pipe insertion loss test bench in this application.

[0021] In the figure:

[0022] 1-first seat body; 2-second seat body; 3-first hard tube; 4-second hard tube; 5-excitation flange; 6-stamping tube; 7-pressure relief tube; 8-pull rod; 9-nut; 10-first flange; 11-second flange; 12-third flange; 13-first vibration-damping pipe; 14-fourth flange; 15-second vibration-damping pipe. DETAILED DESCRIPTION

[0023] To make the purpose, technical solution and advantages of the present invention clearer, the technical solution of the present invention will be described in detail below. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other implementation methods obtained by ordinary technicians in this field without creative work belong to the scope of protection of the present invention.

[0024] Embodiment 1:

[0025] This embodiment provides a vibration-damping pipe insertion loss test bench, which is used to solve the technical problem that the insertion loss test bench in the prior art has large measurement errors in the process of measuring the vibration-damping pipe. Specifically, the test bench in the prior art cannot constrain the length of the vibration-damping pipe to be measured. When measuring multiple times, the difference between the lengths of the vibration-damping pipe leads to different boundary conditions. Moreover, under different pressures, the length of the vibration-damping pipe will change, which will also cause differences in boundary conditions, thereby resulting in large errors in the measurement results.

[0026] The vibration-damping pipe insertion loss test bench comprises a first base body 1, a second base body 2, a first hard pipe 3, a second hard pipe 4, a vibration-exciting flange 5 and a branch pipe.

[0027] Among them, the first base body 1 and the second base body 2 are provided with installation positions, which are installed on a platform or on the ground. Specifically, the first base body 1 and the second base body 2 are both provided with screw holes, and the screws are screwed to the platform or the ground after passing through the screw holes. Of course, the first base body 1 and the second base body 2 can be fixed to the platform or the ground by pre-embedding, that is, the first base body 1 and the second base body 2 are arranged relative to each other.

[0028] One end of the first rigid tube 3 is fixedly connected to the first seat body 1, and one end of the second rigid tube 4 is fixedly connected to the second seat body 2. The first rigid tube 3 and the second rigid tube 4 are both located between the first seat body 1 and the second seat body 2 and are coaxially arranged. As an implementation mode of this embodiment, one end of the first rigid tube 3 in this embodiment is provided with a first flange 10, and the first flange 10 is detachably fixedly connected to the first seat body 1 by a first screw. Of course, one end of the first rigid tube 3 can also be welded to the first seat body 1, and one end of the second rigid tube 4 is provided with a second flange 11, and the second flange 11 is detachably fixedly connected to the second seat body 2 by a second screw. Of course, one end of the second rigid tube 4 can also be welded to the second seat body 2. The first rigid tube 3 and the second rigid tube 4 are coaxially arranged, and the first rigid tube 3 and the second rigid tube 4 are directly opposite. As an optimal implementation mode of this embodiment, the end of the first hard tube 3 close to the first seat body 1 and the end of the second hard tube 4 close to the second seat body 2 in this embodiment are both sealed, that is, the inner hole of the above-mentioned first flange 10 is made solid, and the inner hole of the second flange 11 is also made solid, which can effectively avoid leakage.

[0029] The vibration flange 5 is used to connect with the vibration exciter. The vibration flange 5 is arranged between the other end of the first rigid tube 3 and the other end of the second rigid tube 4. There are intervals for connecting the vibration-damping pipe between the other end of the first rigid tube 3 and the vibration flange 5 and between the other end of the second rigid tube 4 and the vibration flange 5. Preferably, the interval between the vibration flange 5 and the other end of the first rigid tube 3 and the interval between the vibration flange 5 and the other end of the second rigid tube 4 are the same. When in use, the first vibration-damping pipe 13 to be tested is detachably fixedly installed on the other end of the first rigid tube 3, and the first vibration-damping pipe 13 is connected to the first rigid tube 3. The other end of the first vibration-damping pipe 13 is then connected to the vibration flange 5. The second vibration-damping pipe 15 to be tested is detachably fixedly installed on the other end of the second rigid tube 4, and the second vibration-damping pipe 15 is connected to the second rigid tube 4. The other end of the second vibration-damping pipe 15 is then connected to the vibration flange 5. By utilizing the function of the vibration flange 5, the first vibration-damping pipe 13 and the second vibration-damping pipe 15 can be connected. A branch pipe is connected to the first hard tube 3 and / or the second hard tube 4. Optimally, the branch pipe includes a punching pipe 6 and a pressure relief pipe 7. The punching pipe 6 is connected to a high-pressure liquid source. The punching pipe 6 is connected to the first hard tube 3 to punch high-pressure oil into the first hard tube 3. The high-pressure oil will enter the first vibration-damping pipe 13 and the second vibration-damping pipe 15 and the second hard tube 4 for testing. The pressure relief pipe 7 is also arranged on the first hard tube 3 for pressure relief. As another implementation of this embodiment, the branch pipe in this embodiment is connected to an external high-pressure liquid source, and a relief valve is arranged on the branch pipe.

[0030] Through the above structure, the vibration exciter is used to adjust the working state of the vibration flange 5, so that different states are generated between the first vibration-damping pipe 13 and the second vibration-damping pipe 15, so as to obtain the insertion loss related data of the first vibration-damping pipe 13 and the second vibration-damping pipe 15, and the vibration-damping pipe insertion loss test bench has the advantages of simple structure and low cost. Moreover, by means of structural limitation, the lengths of the first vibration-damping pipe 13 and the second vibration-damping pipe 15 are the same. Specifically, the lengths of the first vibration-damping pipe 13 and the second vibration-damping pipe 15 are both equal to half of the difference obtained by subtracting the thickness of the vibration flange 5 from the distance between the other end of the first hard pipe 3 and the other end of the second hard pipe 4, and when the pressure changes, the lengths of the first vibration-damping pipe 13 and the second vibration-damping pipe 15 will not change due to the distance limitation, thereby eliminating the measurement error caused by the difference in measurement boundary conditions caused by the difference in the length of the vibration-damping pipe. Therefore, the vibration-damping pipe insertion loss test bench can obtain more accurate vibration-damping pipe insertion loss experimental data, and the measurement results are more accurate. In addition, the vibration-damping pipe insertion loss test bench provided in this embodiment can adapt to pipe tests of different pressures, and the pipeline pressure can be increased to any designed value through the branch pipe.

[0031] Furthermore, the vibration reduction insertion loss test bench provided in this embodiment can keep the states of the two test pipes completely consistent.

[0032] As a specific implementation of this embodiment, in this embodiment, a third flange 12 is provided at the other end of the first rigid tube 3 (that is, the end of the first rigid tube 3 away from the first base body 1), and the third flange 12 is detachably fixedly connected to the first vibration-damping pipe 13 to be tested by a third screw, and a fourth flange 14 is provided at the other end of the second rigid tube 4 (that is, the end of the second rigid tube 4 away from the second base body 2), and the fourth flange 14 is detachably fixedly connected to the second vibration-damping pipe 15 to be tested by a fourth screw.

[0033] In this embodiment, the first flange 10 and the third flange 12 are arranged on the first rigid tube 3 and the second flange 11 and the fourth flange 14 are arranged on the first rigid tube 3 by welding or integral molding.

[0034] As a specific implementation of this embodiment, the first hard tube 3 and the second hard tube 4 in this embodiment are both steel tubes. Of course, the first hard tube 3 and the second hard tube 4 can also be structural members made of other hard and pressure-resistant materials.

[0035] Embodiment 2:

[0036] This embodiment is a better implementation of the embodiment 1. In this embodiment, a pull rod 8 is detachably fixedly connected between the first seat body 1 and the second seat body 2. Since the pressure in the laboratory is very high, the pull rod 8 can make the connection between the first seat body 1 and the second seat body 2 more stable, thereby preventing the first seat body 1 and the second seat body 2 from being displaced due to the high pressure, thereby improving the use stability of the vibration reduction pipe insertion loss test bench provided in this embodiment.

[0037] As a specific implementation of this embodiment, both ends of the tie rod 8 in this embodiment are studs, and through holes are provided on the first seat body 1 and the second seat body 2. Specifically, the tie rod 8 is a round rod, and external threads are provided on the outer walls of both ends of the tie rod 8 to form studs. During installation, the two ends of the tie rod 8 pass through the through holes on the first seat body 1 and the through holes on the second seat body 2 respectively and then are screwed with nuts 9. The first seat body 1 and the second seat body 2 are tightened by the pre-tightening force between the nuts 9 and the studs.

[0038] More preferably, the number of the pull rods in this embodiment is several, such as three, four or five.

[0039] The above is only a specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art can easily think of changes or substitutions within the technical scope of the present invention, which should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention should be based on the protection scope of the claims.

Claims

1. A vibration damping pipe insertion loss test bench, characterized in that: include: A first seat body and a second seat body, wherein the first seat body and the second seat body are arranged opposite to each other; A first hard tube and a second hard tube, the first hard tube and the second hard tube are located between the first seat body and the second seat body and are coaxially arranged, wherein one end of the first hard tube is fixedly connected to the first seat body, and one end of the second hard tube is fixedly connected to the second seat body; A vibration excitation flange connected to the vibration exciter, the vibration excitation flange is arranged between the other end of the first rigid tube and the other end of the second rigid tube, and a spacer for connecting a vibration damping pipe is respectively arranged between the other end of the first rigid tube and the other end of the second rigid tube; The first hard tube and / or the second hard tube is connected with a branch tube for injecting high-pressure liquid.

2. The vibration damping pipe insertion loss test bench according to claim 1, characterized in that: It also includes a pull rod, two ends of which are detachably fixedly connected to the first seat body and the second seat body.

3. The vibration damping pipe insertion loss test bench according to claim 2, characterized in that: Both ends of the pull rod are studs, and through holes are provided on the first seat body and the second seat body. Both ends of the pull rod pass through the through holes on the first seat body and the through holes on the second seat body respectively and then are screwed with nuts.

4. The vibration damping pipe insertion loss test bench according to claim 3, characterized in that: The number of the pull rods is several.

5. A vibration damping pipe insertion loss test bench according to any one of claims 1 to 4, characterized in that: A first flange is provided at one end of the first rigid tube close to the first seat body, and the first flange is detachably fixedly connected to the first seat body by a first screw. A second flange is provided at one end of the second rigid tube close to the second seat body, and the second flange is detachably fixedly connected to the second seat body by a second screw.

6. The vibration damping pipe insertion loss test bench according to claim 5, characterized in that: One end of the first hard tube close to the first seat body and one end of the second hard tube close to the second seat body are both sealed.

7. The vibration damping pipe insertion loss test bench according to claim 5, characterized in that: A third flange is provided at one end of the first rigid tube away from the first seat body, and the third flange is detachably fixedly connected to the first vibration-damping tube to be tested by a third screw. A fourth flange is provided at one end of the second rigid tube away from the second seat body, and the fourth flange is detachably fixedly connected to the second vibration-damping tube to be tested by a fourth screw.

8. A vibration damping pipe insertion loss test bench according to any one of claims 1 to 4, characterized in that: The first rigid tube and the second rigid tube are both steel tubes.

9. A vibration damping pipe insertion loss test bench according to any one of claims 1 to 4, characterized in that: The branch pipe includes a punching pipe and a pressure relief pipe, and both the punching pipe and the pressure relief pipe are connected to the first hard pipe.

10. A vibration damping pipe insertion loss test bench according to any one of claims 1 to 4, characterized in that: The distance between the other end of the first rigid tube and the vibration excitation flange is the same as the distance between the other end of the second rigid tube and the vibration excitation flange.

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