Testing system for centrifugal fan

Abstract

The utility model discloses a test system for a centrifugal fan, which belongs to the technical field of centrifugal fan test, and comprises a test board, one side of the top of the test board is fixedly connected with a fan impeller body, the other side of the top of the test board is provided with a rotating mechanism, the top of the rotating mechanism is provided with a connecting frame, the connecting frame is of a U-shaped structure, and the fan impeller body is fixedly connected with the fan impeller body. A connecting plate is fixedly connected to the top of the connecting frame, a placement groove is formed in the top of the connecting plate, an anemograph is placed on the inner wall of the placement groove, and a limiting mechanism is arranged on the inner wall of the placement groove. The rotation of the rotating block enables the rotation of the threaded rod, the limiting effect of the inner wall of the connecting port on the connecting rod is matched, at the moment, the connecting frame moves up and down, the height of the anemograph can be changed, then noise test data can be obtained, the anemograph is accurately placed, and the wind speed of the impeller is accurately monitored.

Description

Technical Field

[0001] The utility model belongs to the technical field of centrifugal fan testing, in particular to a testing system for a centrifugal fan. Background Art

[0002] When the fan is running under certain working conditions, the noise generated can be divided into aerodynamic noise, mechanical noise and electromagnetic noise. The following describes the mechanisms of these three noises. Aerodynamic noise is caused by the unstable flow of gas, that is, airflow disturbance, and the noise generated by the interaction between gas and gas and gas and objects. From the mechanism of noise generation, aerodynamic noise is mainly composed of rotational noise and eddy noise. Rotational noise has a discrete spectrum characteristic, also known as discrete noise. It has two mechanisms: one is the noise caused by the blades on the impeller hitting the surrounding air, causing the pressure pulsation of the gas; the other is that there is often a de-flowing area at the outlet of the centrifugal fan blade, and the airflow is very uneven. This uneven airflow periodically acts on the surrounding medium or the shell to produce pressure pulsation and form noise. A test system for centrifugal fans is required.

[0003] In the prior art, the test system of the centrifugal fan generally requires a 130FLJ0 small centrifugal fan, a Huawei Mate305G full-network mobile phone (recording equipment), a thermal film anemometer, scissors, a DT-6234C laser tachometer and a UTI260A infrared thermal imager. When the instrument is set up for testing, the staff is required to disassemble the centrifugal fan impeller, separate the centrifugal fan motor from the casing and place it on 2 cm corrugated cotton, connect the fan and anemometer power supply, and then draw experimental conclusions after data collection and analysis.

[0004] However, when the above device is in use, the size of the anemometer is fixed, and the staff needs to place it in front of the fan impeller to test the wind speed. If the position of the anemometer is not accurate enough, the wind speed monitoring of the impeller will not be accurate enough, affecting the final experimental data results. Utility Model Content

[0005] The purpose of the utility model is to solve the shortcomings of the prior art and propose a test system for centrifugal fans. The utility model has the advantages of achieving accurate experimental structure effects.

[0006] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0007] A test system for a centrifugal fan comprises a test plate, a fan impeller body is fixedly connected to one side of the top of the test plate, a rotating mechanism is arranged on the other side of the top of the test plate, a connecting frame is arranged on the top of the rotating mechanism, the connecting frame is in a U-shaped structure, a connecting plate is fixedly connected to the top of the connecting frame, a placement groove is opened on the top of the connecting plate, an anemometer is placed on the inner wall of the placement groove, and a limiting mechanism is arranged on the inner wall of the placement groove.

[0008] Through the above technical solution: when in use, the fan impeller on the centrifugal fan is disassembled and installed on the test board, and the anemometer is squeezed against the fixed plate. At this time, the fixed plate slides in the inner wall of the fixed groove and compresses the fixed spring. After the anemometer contacts the bottom inner wall of the placement groove, the fixed plate can fix the anemometer under the pressure of the fixed spring, so that the limit rod is separated from the limit port, and the rotating block is rotated. The rotation of the rotating block can make the threaded rod rotate, and the inner wall of the connecting port limits the connecting rod. At this time, the connecting frame will move up and down, which can change the height of the anemometer. When collecting noise test data, all audio data can be imported into Adobe In the Audition software, select the stable interval of the soundprint feature and scan its frequency characteristics, import the obtained data into an Excel table, select the characteristic peak data and draw a line graph, compare the line graph under different data with the original audio of the centrifugal fan, and run the TTEST function on the noise-reduced data of the centrifugal fan and the original data for similarity comparison. Therefore, the anemometer can be placed accurately and the wind speed monitoring of the impeller can be accurate. Finally, the experimental conclusion can achieve the effect of accurate experimental structure.

[0009] The utility model is further configured such that the limiting mechanism includes two symmetrically distributed fixing plates, both sides of the placement groove are provided with fixing grooves that form a sliding fit with the fixing plates, and the same fixing spring is fixedly connected between the side walls of the fixing groove and the fixing plates.

[0010] Through the above technical solution: the setting of the fixing plate can slide in the inner wall of the fixing groove, and the anemometer can be fixed in cooperation with the elastic force of the fixing spring.

[0011] The utility model is further configured such that opposite sides of the two fixing plates are both inclined.

[0012] Through the above technical solution: the inclined setting can facilitate the workers to install and operate the anemometer.

[0013] The utility model is further configured that the rotating mechanism and the connecting frame are connected to a threaded rod through threads, and a rotating block is fixedly connected to the bottom of the threaded rod.

[0014] Through the above technical solution: the setting of the rotating block can cause the threaded rod to rotate when rotating, and the rotation of the threaded rod can cause the connecting frame to move.

[0015] The utility model is further configured such that a limiting opening is provided on the top of the rotating block, and a limiting rod is hinged on one side of the bottom of the test plate to form a sliding fit with the inner wall of the limiting opening.

[0016] Through the above technical solution: the setting of the limiting rod can cooperate with the limiting of the inner wall of the limiting opening, which can facilitate the moving operation of the connecting frame.

[0017] The utility model is further configured that the top of the limiting rod is fixedly connected to a limiting spring, and the limiting spring is fixedly connected to the bottom of the test plate.

[0018] Through the above technical solution: the setting of the limit spring can apply pressure to the limit rod, so that the limit rod can be placed stably in the limit opening.

[0019] The utility model is further configured that the inner walls at both ends of the limiting opening are fixedly connected with fixing pads, and the fixing pads are made of rubber material.

[0020] Through the above technical solution: the setting of the fixed pad can make the limiting rod be placed stably in the limiting opening.

[0021] The utility model is further configured that a connection port is opened at one end of the test plate, a connection rod is slidably connected to the inner wall of the connection port, and the connection rod is fixedly connected to the connection frame.

[0022] Through the above technical solution: the setting of the connecting rod can prevent the connecting frame from rotating as the threaded rod rotates.

[0023] The beneficial effects of the utility model are:

[0024] 1. When using the test system for centrifugal fans, the fan impeller on the centrifugal fan is disassembled and installed on the test board, and the anemometer is pressed against the fixing plate. At this time, the fixing plate slides in the inner wall of the fixing groove and compresses the fixing spring. After the anemometer contacts the bottom inner wall of the placement groove, the fixing plate can fix the anemometer under the pressure of the fixing spring, so that the limit rod is separated from the limit port, and the rotating block is rotated. The rotation of the rotating block can make the threaded rod rotate, and the inner wall of the connecting port limits the connecting rod. At this time, the connecting frame will move up and down, which can change the height of the anemometer. When collecting noise test data, all audio data can be imported into Adobe In the Audition software, select the stable interval of the soundprint feature and scan its frequency characteristics, import the obtained data into an Excel table, select the characteristic peak data and draw a line graph, compare the line graph under different data with the original audio of the centrifugal fan, and run the TTEST function on the noise-reduced data of the centrifugal fan and the original data for similarity comparison. Therefore, the anemometer can be placed accurately and the wind speed monitoring of the impeller can be accurate. Finally, the experimental conclusion can achieve the effect of accurate experimental structure.

[0025] 2. The test system for centrifugal fans can rotate the threaded rod by means of a rotating block, and the rotation of the threaded rod can move the connecting frame. The limit rod can cooperate with the inner wall of the limit opening to facilitate the movement of the connecting frame. The limit spring can apply pressure to the limit rod, so that the limit rod can be stably placed in the limit opening, and the fixing pad can make the limit rod stably placed in the limit opening. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 This is a schematic diagram of the three-dimensional structure of a test system for a centrifugal fan proposed by the utility model;

[0027] Figure 2 This is a partial cross-sectional structural schematic diagram of a test system for a centrifugal fan proposed by the utility model;

[0028] Figure 3 for Figure 2 Schematic diagram of the enlarged structure at point A in the middle.

[0029] In the figure: 1. test plate; 2. fan impeller body; 3. connecting frame; 4. connecting plate; 5. placement slot; 6. fixing slot; 7. fixing spring; 8. fixing plate; 10. threaded rod; 11. rotating block; 12. limit rod; 13. limit mouth; 14. limit spring; 15. fixing pad. DETAILED DESCRIPTION

[0030] The technical solution of this patent is further described in detail below in conjunction with specific implementation methods.

[0031] The embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0032] In the description of this patent, it should be understood that the terms "center", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing this patent and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on this patent.

[0033] In the description of this patent, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", and "set" should be understood in a broad sense, for example, it can be fixedly connected or set, or it can be detachably connected or set, or connected or set in one piece. For ordinary technicians in this field, the specific meanings of the above terms in this patent can be understood according to specific circumstances.

[0034] Reference Figure 1-3 A test system for a centrifugal fan includes a test plate 1, a fan impeller body 2 is fixedly connected to one side of the top of the test plate 1, a rotating mechanism is arranged on the other side of the top of the test plate 1, a connecting frame 3 is arranged on the top of the rotating mechanism, the connecting frame 3 is in a U-shaped structure, a connecting plate 4 is fixedly connected to the top of the connecting frame 3, a placement groove 5 is opened on the top of the connecting plate 4, an anemometer is placed on the inner wall of the placement groove 5, and a limiting mechanism is arranged on the inner wall of the placement groove 5.

[0035] It should be noted that, in the present embodiment, the limiting mechanism includes two symmetrically distributed fixing plates 8, and fixing grooves 6 that form a sliding fit with the fixing plates 8 are provided on both sides of the placement groove 5. The side walls of the fixing groove 6 and the fixing plates 8 are fixedly connected with the same fixing spring 7, so that the fixing plate 8 can slide in the inner wall of the fixing groove 6, and the elastic force of the fixing spring 7 can be cooperated to fix the anemometer.

[0036] Furthermore, in this embodiment, the opposite sides of the two fixing plates 8 are both inclined, and the inclined fixing plates 8 can facilitate the installation operation of the anemometer by the staff.

[0037] The rotating mechanism is connected to the connecting frame 3 through a threaded rod 10, and a rotating block 11 is fixedly connected to the bottom of the threaded rod 10. The rotating block 11 can rotate the threaded rod 10 when rotating, and the rotation of the threaded rod 10 can move the connecting frame 3.

[0038] A limit opening 13 is provided at the top of the rotating block 11, and a limit rod 12 is hinged on one side of the bottom of the test plate 1 to form a sliding fit with the inner wall of the limit opening 13. The limit rod 12 can cooperate with the limit of the inner wall of the limit opening 13, which can facilitate the movement operation of the connecting frame 3.

[0039] The top of the limiting rod 12 is fixedly connected to a limiting spring 14 , which is fixedly connected to the bottom of the test plate 1 . The limiting spring 14 can apply pressure to the limiting rod 12 , so that the limiting rod 12 can be stably placed in the limiting opening 13 .

[0040] The inner walls at both ends of the limiting opening 13 are fixedly connected with fixing pads 15 , and the fixing pads 15 are made of rubber. The fixing pads 15 can ensure that the limiting rod 12 is stably placed in the limiting opening 13 .

[0041] A connection port is provided at one end of the test board 1, and a connection rod is slidably connected to the inner wall of the connection port. The connection rod is fixedly connected to the connection frame 3, and the connection rod can prevent the connection frame 3 from rotating as the threaded rod 10 rotates.

[0042] Working principle: When in use, remove the fan impeller on the centrifugal fan and install it on the test board 1, and squeeze the anemometer against the fixing plate 8. At this time, the fixing plate 8 slides in the inner wall of the fixing groove 6 and compresses the fixing spring 7. After the anemometer contacts the bottom inner wall of the placement groove 5, the fixing plate 8 can fix the anemometer under the pressure of the fixing spring 7, so that the limiting rod 12 is separated from the limiting port 13, and the rotating block 11 is rotated. The rotation of the rotating block 11 can make the threaded rod 10 rotate, and cooperate with the inner wall of the connecting port to limit the connecting rod. At this time, the connecting frame 3 will move up and down, which can change the height of the anemometer. When collecting noise test data, all audio data can be imported into Adobe In the Audition software, select the stable interval of the soundprint feature and scan its frequency characteristics, import the obtained data into an Excel table, select the characteristic peak data and draw a line graph, compare the line graph under different data with the original audio of the centrifugal fan, and run the TTEST function on the noise-reduced data of the centrifugal fan and the original data for similarity comparison. Therefore, the anemometer can be placed accurately and the wind speed monitoring of the impeller can be accurate. Finally, the experimental conclusion can achieve the effect of accurate experimental structure.

[0043] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes within the technical scope disclosed by the present invention according to the technical scheme and the utility model concept of the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A test system for a centrifugal fan, comprising a test plate (1), a fan impeller body (2) being fixedly connected to one side of the top of the test plate (1), It is characterized in that A rotating mechanism is provided on the other side of the top of the test plate (1), a connecting frame (3) is provided on the top of the rotating mechanism, the connecting frame (3) is in a U-shaped structure, a connecting plate (4) is fixedly connected to the top of the connecting frame (3), a placement groove (5) is provided on the top of the connecting plate (4), an anemometer is placed on the inner wall of the placement groove (5), and a limiting mechanism is provided on the inner wall of the placement groove (5).

2. The test system for a centrifugal fan according to claim 1, It is characterized in that The limiting mechanism comprises two symmetrically distributed fixing plates (8), both sides of the placement groove (5) are provided with fixing grooves (6) that form a sliding fit with the fixing plates (8), and a same fixing spring (7) is fixedly connected between the side walls of the fixing groove (6) and the fixing plates (8).

3. The test system for a centrifugal fan according to claim 2, It is characterized in that The opposite sides of the two fixing plates (8) are both arranged in an inclined manner.

4. The test system for a centrifugal fan according to claim 3, It is characterized in that The rotating mechanism and the connecting frame (3) are connected by a threaded rod (10), and a rotating block (11) is fixedly connected to the bottom of the threaded rod (10).

5. The test system for a centrifugal fan according to claim 4, It is characterized in that A limiting opening (13) is provided on the top of the rotating block (11), and a limiting rod (12) is hingedly connected to one side of the bottom of the test plate (1) and forms a sliding fit with the inner wall of the limiting opening (13).

6. The test system for a centrifugal fan according to claim 5, It is characterized in that A limiting spring (14) is fixedly connected to the top of the limiting rod (12), and the limiting spring (14) is fixedly connected to the bottom of the test plate (1).

7. The test system for a centrifugal fan according to claim 6, It is characterized in that The inner walls at both ends of the limiting opening (13) are fixedly connected with fixing pads (15), and the fixing pads (15) are made of rubber material.

8. The test system for a centrifugal fan according to claim 1, It is characterized in that A connection port is provided at one end of the test plate (1), a connection rod is slidably connected to the inner wall of the connection port, and the connection rod is fixedly connected to the connection frame (3).

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