Mounting jig

Abstract

The utility model belongs to the technical field of noise testing, and discloses an installation jig which comprises an installation plate, a bottom plate and a vibration reduction assembly, the installation plate is provided with an installation hole, the bottom plate is arranged opposite to the installation hole and fixedly connected with the installation plate, the bottom plate is provided with an air passing channel, and the vibration reduction assembly is arranged in the air passing channel. A mounting space is defined by the bottom plate and the inner wall of the mounting hole; the vibration reduction assembly is arranged in the installation space and used for installing a fan and reducing vibration of the fan. The base frequency of the fan can be effectively reduced, and the noise test accuracy is improved.

Description

Technical Field

[0001] The present application relates to the technical field of noise testing, and more specifically, to a mounting fixture. Background Art

[0002] Fan noise is an important performance metric for evaluating fan performance. Typically, a backpressure chamber is used to simulate the noise performance of a fan operating in a system. During this test, the fan is bolted to the chamber's mounting plate. A microphone is positioned at a distance from the fan inlet to detect noise. The pressure regulating plate of the backpressure chamber is slowly adjusted to achieve the pressure corresponding to the fan's operating point. The noise generated by the fan at this point is the noise generated by the fan operating after entering the system.

[0003] However, in actual tests, it was found that because the existing mounting plate material is acrylic, Bakelite or rigid material, the fan, bolts and mounting plate form a rigid connection. When the fan is installed on the back-pressure box, the fan rotation will produce jitter or vibration, causing resonance between the fan and the mounting plate and the back-pressure box, resulting in a higher fundamental frequency of the fan, resulting in louder fan test noise, which affects the accuracy of the noise test data and has a certain impact on subsequent optimization analysis. Utility Model Content

[0004] The embodiment of the present application provides a mounting fixture that can effectively reduce the fundamental frequency of the fan and improve the accuracy of noise testing.

[0005] The installation fixture provided in this application adopts the following technical solution:

[0006] A mounting fixture, comprising:

[0007] A mounting plate and a bottom plate, wherein the mounting plate is provided with a mounting hole, the bottom plate is arranged opposite to the mounting hole and is fixedly connected to the mounting plate, the bottom plate is provided with an air passage, and the bottom plate and the inner wall of the mounting hole enclose a mounting space;

[0008] The vibration reduction assembly is arranged in the installation space, and the vibration reduction assembly is used to install the fan and reduce the vibration of the fan.

[0009] Optionally, a plurality of the vibration damping assemblies are provided, and the plurality of vibration damping assemblies are all installed in the installation space and distributed in a circular array relative to the center of the installation hole.

[0010] Optionally, the vibration reduction assembly includes a mounting base and a first buffer member, one end of the first buffer member is connected to the base plate, and the other end is connected to the mounting base; the fan is detachably connected to the mounting base.

[0011] Optionally, the mounting base is provided with screw holes for screws to pass through, and the positions of the screw holes correspond to the installation positions of the fans. The fan is assembled on the mounting base by screws passing through the screw holes.

[0012] Optionally, the vibration damping assembly further includes a second buffer member, the central axis of the second buffer member is perpendicular to the central axis of the first buffer member, one end of the second buffer member is connected to the mounting plate, and the other end is connected to the mounting base.

[0013] Optionally, the vibration damping assembly further includes a third buffer member, the central axis of the third buffer member is perpendicular to the central axes of the first buffer member and the second buffer member, one end of the third buffer member is connected to the mounting plate, and the other end is connected to the mounting base.

[0014] Optionally, the mounting base is provided with a first side plate and a second side plate, the end of the second buffer away from the mounting plate is fixedly connected to the first side plate, and the end of the third buffer away from the mounting plate is fixedly connected to the second side plate.

[0015] Optionally, four vibration damping assemblies are provided, the mounting hole is a square hole, and the four vibration damping assemblies are respectively provided at the four corners of the mounting hole.

[0016] Optionally, the mounting plate is a damping plate, and the mounting base is a rubber pad base.

[0017] Optionally, an isolation plate is further included, which is used to be fixedly connected to the back pressure box, and the mounting plate is located on one side of the isolation plate and is fixedly mounted on the isolation plate.

[0018] It can be seen from the above technical solutions that the embodiments of the present application have the following advantages:

[0019] The fan is installed in the installation space through a vibration reduction component. The vibration reduction component can reduce the fan's own vibration during operation, thereby reducing the resonance between the fan and the mounting plate and the back pressure box, reducing the fan's fundamental frequency, and then effectively reducing the impact of the fan's vibration on the noise test, thereby improving the accuracy of the noise test. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments recorded in the present application. For ordinary technicians in this field, other drawings can also be obtained based on these drawings.

[0021] Figure 1 This is a schematic diagram of the overall structure of a mounting fixture disclosed in an embodiment of the present application;

[0022] Figure 2 This is a schematic structural diagram of a mounting fixture disclosed in an embodiment of the present application, highlighting the vibration reduction assembly, the mounting plate, and the base plate;

[0023] Figure 3 This is a structural schematic diagram of a mounting fixture highlighting a vibration reduction component disclosed in an embodiment of the present application.

[0024] Description of reference numerals:

[0025] 1. Mounting plate; 11. Mounting hole; 2. Bottom plate; 21. Air duct; 3. Vibration damping assembly; 31. Mounting base; 311. Screw hole; 312. First side panel; 313. Second side panel; 32. First buffer; 33. Second buffer; 34. Third buffer; 4. Isolation plate; 5. Back pressure box; 51. Pressure regulating plate; 52. Isolation pad; 6. Fan. DETAILED DESCRIPTION

[0026] The present application is further described in detail below with reference to the accompanying drawings.

[0027] The embodiment of the present application provides a mounting fixture that can effectively reduce the fundamental frequency of the fan and improve the accuracy of noise testing.

[0028] In order to enable those skilled in the art to better understand the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only embodiments of a part of the present application, not all embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without making creative work should fall within the scope of protection of this application. In addition, the technical solutions between the various embodiments can be combined with each other, but they must be based on the ability of ordinary technicians in this field to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection required by this application.

[0029] The terms "first," "second," "third," "fourth," and the like in the specification and claims of this application and in the accompanying drawings are used to distinguish similar objects and are not necessarily used to describe a particular order or precedence. It should be understood that the terms used in this manner are interchangeable where appropriate so that the embodiments described herein can be implemented in an order other than that illustrated or described herein. In addition, the terms "including" and "having," and any variations thereof, are intended to cover non-exclusive inclusions, e.g., a process, method, system, product, or apparatus comprising a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such process, method, product, or apparatus.

[0030] When the back-pressure box 5 is subjected to a noise test, the fan 6 is fastened to the mounting plate 1 of the back-pressure box 5 by bolts and is operated. A microphone is set at a certain position away from the inlet of the fan 6 to detect noise. The pressure corresponding to the working point of the fan 6 is reached by slowly adjusting the pressure regulating plate 51 of the back-pressure box 5. At this time, the noise generated by the fan 6 is the noise generated by the fan 6 after entering the system. However, in actual tests, it was found that because the existing mounting plate 1 is made of acrylic, bakelite or rigid material, a rigid connection is formed between the fan 6, the bolts and the mounting plate 1. When the fan 6 is installed on the back-pressure box 5 and is working, the rotation of the fan 6 will generate shaking or vibration, causing resonance between the fan 6 and the mounting plate 1 and the back-pressure box 5, resulting in a higher fundamental frequency of the fan 6, resulting in a larger test noise of the fan 6, thereby affecting the accuracy of the noise test data and having a certain impact on the subsequent optimization analysis.

[0031] In order to solve the above technical problems, this application discloses a mounting fixture, please refer to Figure 1 and Figure 2 , is an embodiment of the mounting fixture in the embodiments of the present application. The mounting fixture is described by taking the installation of the fan 6 to the back-pressure box 5 as an example. The mounting fixture includes a mounting plate 1, a bottom plate 2, and a vibration reduction assembly 3. The mounting plate 1 is located on one side of the back-pressure box 5 and is arranged on the opposite side of the pressure regulating plate 51 of the back-pressure box 5. The mounting plate 1 is provided with a mounting hole 11. The mounting hole 11 is located in the center of the mounting plate 1 to achieve optimal air flow efficiency and uniform airflow distribution. The bottom plate 2 is arranged opposite to the mounting hole 11 and is fixedly connected to the mounting plate 1. The bottom plate 2 and the inner wall of the mounting hole 11 enclose a mounting space. In this embodiment, base plate 2 is positioned within mounting hole 11, with its edge fixedly connected to the inner wall of mounting hole 11. In this case, the depth of the mounting space is approximately the depth of mounting hole 11 minus the thickness of base plate 2. In other embodiments, base plate 2 is positioned on the back of mounting plate 1. If mounting plate 1 has the same thickness, positioning base plate 2 on the back of mounting plate 1 can increase the volume of the mounting space. In this case, the depth of the mounting space is approximately equal to the thickness of mounting plate 1. Base plate 2 is provided with an airflow channel 21. Mounting hole 11 and airflow channel 21 form a path for airflow through fan 6. A vibration damping assembly 3 is positioned within the mounting space to mount fan 6 and reduce its vibration. It is understood that the fan 6 is mounted within the mounting space via the vibration damping assembly 3. The vibration damping assembly 3 can reduce the self-vibration of the fan 6 during operation, thereby reducing the resonance between the fan 6, mounting plate 1, and backpressure box 5, lowering the fundamental frequency of the fan 6. This effectively reduces the impact of fan 6 vibration on the noise test, thereby improving the accuracy of the noise test.

[0032] See also Figure 2In this embodiment, mounting plate 1 is a damping plate. The material of mounting plate 1 is rubber or an elastic material with equivalent elasticity or damping coefficient. The area of ​​mounting plate 1 is much larger than that of fan 6. When fan 6 is operating, it generates mechanical vibrations. By modifying the material properties of mounting plate 1, mounting plate 1 acts as an energy absorber to absorb the vibration impact generated by the operation of fan 6, thereby achieving a vibration damping effect and reducing the vibration of fan 6. Furthermore, the area and mass of mounting plate 1 are much larger than those of fan 6. The greater mass and area provide a better damping effect, reducing resonance between fan 6, mounting plate 1, and backpressure box 5, thereby improving the stability and service life of the device.

[0033] In order to further reduce the resonance between the fan 6, the mounting plate 1 and the back-pressure box 5, the mounting fixture is further provided with an isolation plate 4. The isolation plate 4 is made of rubber or other elastic materials and has good vibration absorption performance. The isolation plate 4 is fixedly connected to the back-pressure box 5, and the mounting plate 1 is located on one side of the isolation plate 4 and is fixedly mounted on the isolation plate 4. It can be understood that the mounting plate 1 is located on the side of the isolation plate 4 away from the back-pressure box 5. By providing the isolation plate 4, a soft landing point is provided between the mounting plate 1 and the back-pressure box 5, which reduces the vibration generated by the fan 6 from directly impacting the back-pressure box 5 through the mounting plate 1, and can weaken the vibration of the fan 6, further reduce the resonance between the fan 6, the mounting plate 1 and the back-pressure box 5, and reduce the fundamental frequency of the fan 6.

[0034] An isolation pad 52 is provided between the back-pressure box 5 and the ground. The isolation pad 52 is made of rubber or other elastic materials and has good vibration absorption performance. When the fan 6 is running, mechanical vibration is easily generated, causing the back-pressure box 5 to resonate. The friction generated between the back-pressure box 5 and the ground is transmitted to the surrounding environment and converted into sound waves, resulting in an increase in noise when the fan 6 is measured. In this embodiment, by adding the isolation pad 52, most of the vibration energy transmitted to the back-pressure box 5 can be absorbed and dispersed, reducing its ability to be transmitted from the back-pressure box 5; secondly, the isolation pad 52 can reduce the friction between the back-pressure box 5 and the ground, reduce the transmission of vibration and noise through physical damping, improve the quietness of the fan 6 during testing, and improve the accuracy of the test.

[0035] See also Figure 2 and Figure 3Multiple vibration damping assemblies 3 are provided, each installed within the installation space and arranged in a circular array relative to the center of the mounting hole 11. The number of vibration damping assemblies 3 is the same as the number of mounting locations for the fan 6. In this embodiment, the fan 6 is generally cube-shaped, having four mounting locations, one at each of the four corners of the fan 6. Four vibration damping assemblies 3 are provided corresponding to the mounting locations of the fan 6. The mounting hole 11 is a square hole, and the four vibration damping assemblies 3 are respectively provided at the four corners of the mounting hole 11. Through the cooperation of the four vibration damping assemblies 3 with the mounting locations of the fan 6, the fan 6 is stably assembled on the backpressure box 5.

[0036] Please refer to Figure 3 The vibration reduction assembly 3 includes a mounting base 31, a first buffer 32, a second buffer 33, and a third buffer 34. The fan 6 is detachably connected to the mounting base 31. One end of the first buffer 32 is connected to the bottom plate 2, and the other end is connected to the mounting base 31. The central axis of the second buffer 33 is perpendicular to the central axis of the first buffer 32. One end of the second buffer 33 is connected to the mounting plate 1, and the other end is connected to the mounting base 31. The central axis of the third buffer 34 is perpendicular to the central axes of the first and second buffers 32, 33. One end of the third buffer 34 is connected to the mounting plate 1, and the other end is connected to the mounting base 31. In this embodiment, the first buffer member 32 is arranged along the Z-axis direction, the second buffer member 33 is arranged along the X-axis direction, and the third buffer member 34 is arranged along the Y-axis direction. The first buffer member 32 is used to buffer the force acting on the mounting base 31 in the Z-axis direction, the second buffer member 33 is used to buffer the force acting on the mounting base 31 in the X-axis direction, and the third buffer member 34 is used to buffer the force acting on the mounting base 31 in the Y-axis direction. The first buffer member 32, the second buffer member 33 and the third buffer member 34 cooperate with each other to limit the movement of the mounting base 31 in the three degrees of freedom directions.

[0037] The mounting base 31 is provided with a first side plate 312 and a second side plate 313, which are perpendicular to each other. The end of the second buffer member 33 facing away from the mounting plate 1 is fixedly connected to the first side plate 312, and the end of the third buffer member 34 facing away from the mounting plate 1 is fixedly connected to the second side plate 313. The first and second side plates 312 and 313 increase the contact area between the second and third buffer members 33 and 34 and the mounting base 31, thereby enhancing the installation stability of the second and third buffer members 33 and 34 with the mounting base 31. In this embodiment, springs are preferably used for the first, second, and third buffer members 32, 33, and 34.

[0038] The mounting base 31 is provided with screw holes 311 for screws. The positions of the screw holes 311 correspond to the mounting positions of the fan 6. The fan 6 is assembled to the mounting base 31 by screws inserted through the screw holes 311. In this embodiment, the mounting base 31 is a rubber pad base with excellent vibration absorption properties. The fan 6 is fixed to the mounting base 31 via screws. The mounting base 31 absorbs and disperses the mechanical vibrations generated by the fan 6 during operation, reducing the transmission of noise. Furthermore, the rubber pad base is soft and non-slip, making the fan 6 more stable and preventing movement or tilting due to slight vibrations.

[0039] When the fan 6 is running, the vibration generated by the fan 6 is transmitted through the mounting base 31. Due to the arrangement of the first buffer member 32, the second buffer member 33 and the third buffer member 34, the springs in each direction can work independently, and together form a three-dimensional vibration reduction system. On the one hand, the impact between the mounting base 31 and the inner wall of the mounting hole 11 is effectively reduced, and the movement of the mounting base 31 is buffered, thereby avoiding additional noise caused by the impact. On the other hand, the first buffer member 32, the second buffer member 33 and the third buffer member 34 can absorb the vibration of the fan 6 and the resonance between the fan 6 and the mounting base 31 in the directions of three degrees of freedom, and convert the generated vibration into energy that generates elastic deformation of the first buffer member 32, the second buffer member 33 and the third buffer member 34. When the first buffer member 32 is compressed by force, the first buffer member 32 stores energy. When the vibration direction changes, the first buffer member 32 releases the stored energy and returns to its original state. The elastic deformation process consumes a portion of mechanical energy, reducing the decibel level of the mechanical noise caused by the vibration directly transmitted into the air, thereby improving the overall quietness of the fan 6 and improving the accuracy of the noise test data.

[0040] As described above, the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the above embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the above embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present application.

Claims

1. A mounting fixture, characterized in that: include: A mounting plate and a bottom plate, wherein the mounting plate is provided with a mounting hole, the bottom plate is arranged opposite to the mounting hole and is fixedly connected to the mounting plate, the bottom plate is provided with an air passage, and the bottom plate and the inner wall of the mounting hole enclose a mounting space; The vibration reduction assembly is arranged in the installation space, and the vibration reduction assembly is used to install the fan and reduce the vibration of the fan.

2. The installation jig according to claim 1, characterized in that: There are multiple vibration damping assemblies, and the multiple vibration damping assemblies are all installed in the installation space and distributed in a circular array relative to the center of the installation hole.

3. The installation jig according to claim 1, characterized in that: The vibration reduction assembly includes a mounting base and a first buffer member, one end of the first buffer member is connected to the bottom plate, and the other end is connected to the mounting base; the fan is detachably connected to the mounting base.

4. The installation jig according to claim 3, characterized in that: The mounting base is provided with screw holes for screws to pass through, and the positions of the screw holes correspond to the mounting positions of the fans. The fan is assembled on the mounting base by screws passing through the screw holes.

5. The installation jig according to claim 3, characterized in that: The vibration damping assembly further includes a second buffer member, the central axis of the second buffer member is perpendicular to the central axis of the first buffer member, one end of the second buffer member is connected to the mounting plate, and the other end is connected to the mounting base.

6. The installation jig according to claim 5, characterized in that: The vibration damping assembly further includes a third buffer member, the central axis of the third buffer member is perpendicular to the central axes of the first buffer member and the second buffer member, one end of the third buffer member is connected to the mounting plate, and the other end is connected to the mounting base.

7. The installation jig according to claim 6, characterized in that: The mounting base is provided with a first side plate and a second side plate, one end of the second buffer away from the mounting plate is fixedly connected to the first side plate, and one end of the third buffer away from the mounting plate is fixedly connected to the second side plate.

8. The installation jig according to claim 2, characterized in that: There are four vibration damping assemblies, the mounting hole is a square hole, and the four vibration damping assemblies are respectively arranged at the four corners of the mounting hole.

9. The installation jig according to claim 3, characterized in that: The mounting plate is a damping plate, and the mounting base is a rubber pad base.

10. The installation jig according to claim 1, characterized in that: It also includes an isolation plate, which is used to be fixedly connected to the back pressure box. The mounting plate is located on one side of the isolation plate and is fixedly mounted on the isolation plate.

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