Noise reduction device of frequency converter

Abstract

The utility model discloses a frequency converter noise reduction device, and relates to the technical field of noise reduction devices. The frequency converter noise reduction device comprises a frequency converter body, a cooling fan arranged in the frequency converter body and a screen plate arranged on the side, close to the cooling fan, of the frequency converter body, and a noise reduction mechanism is arranged on one side of the screen plate. According to the device, the noise reduction cover and the noise reduction pipe which are combined are arranged at the position, close to the cooling fan, of the frequency converter, and noise reduction materials are arranged in the noise reduction cover and the noise reduction pipe, so that multi-stage noise reduction of noise at the cooling fan can be achieved, and the situation of noise reduction failure is avoided; the arrangement position of the outlet end of the noise reduction pipe is adjusted and controlled, noise caused by the fact that airflow exhausted from the outlet end of the noise reduction pipe makes contact with external objects is avoided, and the noise reduction effect is good.

Description

Technical Field

[0001] The utility model relates to the technical field of noise reduction devices, in particular to a frequency converter noise reduction device. Background Art

[0002] During the use of the inverter, it needs to be cooled by the cooling fan installed there. When the cooling fan rotates at high speed, the friction between the blades and the air and the operation of the drive motor itself will generate noise. The noise is then discharged into the external environment along with the flow of part of the airflow from the cooling fan, causing a large amount of noise in the external environment.

[0003] Since materials such as sound-absorbing cotton have a significant damping effect on sound waves, the sound waves of noise will be hindered when propagating between fibers, resulting in a gradual decrease in the propagation speed and energy of the sound waves. Therefore, the existing devices such as sound insulation boards or sound-absorbing cotton are installed near the cooling fan of the inverter to achieve the purpose of noise reduction. However, when the noise reduction device is damaged, there is no other device at the inverter to reduce the noise near the cooling fan, and the cooling fan airflow will come into contact with surrounding objects when discharged into the external environment, such as plant leaves and flags located nearby, making it impossible to effectively reduce the noise. In view of the shortcomings of the existing technology, we propose an inverter noise reduction device to solve the above problems. Utility Model Content

[0004] In response to the shortcomings of the existing technology, the utility model provides an inverter noise reduction device, which solves the problem that when the noise reduction device is damaged, there is no other device at the inverter to reduce the noise near the cooling fan, and the cooling fan airflow comes into contact with the surrounding objects when discharged into the external environment, making it impossible to effectively reduce the noise.

[0005] To achieve the above objectives, the present invention is implemented through the following technical solutions: a frequency converter noise reduction device, comprising a frequency converter body, a cooling fan disposed inside the frequency converter body, and a mesh plate disposed on a side of the frequency converter body close to the cooling fan, wherein a noise reduction mechanism is provided on one side of the mesh plate, and the noise reduction mechanism comprises:

[0006] The noise reduction cover and the noise reduction pipe are combined, and one end of the noise reduction cover is fixedly connected to one side of the mesh plate;

[0007] First sound absorbing panels, wherein multiple groups of first sound absorbing panels are arranged inside the noise reduction cover, and sound absorbing cotton is supported between the multiple groups of first sound absorbing panels;

[0008] A steering assembly is arranged between the noise reduction cover and the noise reduction pipe. The steering assembly includes a gear ring fixedly arranged on the outer wall of one end of the noise reduction pipe, a gear block engaged with the outer wall of the gear ring, and an adjusting screw for controlling the movement of the gear block. The position of the outlet end of the noise reduction pipe is adjusted through the steering assembly.

[0009] Preferably, a sealing ring is fixedly provided at one end of the noise reduction cover close to the noise reduction tube, and the end of the noise reduction tube provided with a gear ring is rotatably provided inside the sealing ring, and the gear block is limitedly slid inside the sealing ring.

[0010] Preferably, a bearing is fixedly provided on the top surface of the gear block, and the outer wall of one end of the adjusting screw extending to the interior of the sealing ring is fixedly connected to the inner wall of the bearing.

[0011] Preferably, a plurality of groups of second sound absorbing panels are staggeredly arranged inside the noise reduction tube.

[0012] Preferably, the outlet end of the noise reduction pipe is provided with a filter plate for preventing impurities from entering the interior of the noise reduction pipe, and a split component is provided between the filter plate and the noise reduction pipe.

[0013] Preferably, the split assembly includes a first threaded ring fixedly arranged on the outlet end of the noise reduction pipe and a second threaded ring fixedly arranged on the outer wall of the filter plate, and the outer wall of the second threaded ring is threadedly connected to the inner wall of the first threaded ring.

[0014] Preferably, a buffer guide plate is provided on the inner wall of the noise reduction pipe.

[0015] The utility model discloses a frequency converter noise reduction device, which has the following beneficial effects: the frequency converter noise reduction device arranges a combined noise reduction cover and a noise reduction tube at a position of the frequency converter near the cooling fan, and noise reduction materials are arranged inside the noise reduction cover and the noise reduction tube, so that multi-stage noise reduction of the cooling fan can be achieved, and the noise reduction failure can be avoided. In combination with the gear ring, the gear block and the adjusting screw, the setting position of the outlet end of the noise reduction tube can be regulated to avoid the airflow discharged from the outlet end of the noise reduction tube from contacting external objects to generate noise, and the noise reduction effect is good. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. 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 any creative work.

[0017] Figure 1 This is a schematic diagram of the overall structure of the utility model;

[0018] Figure 2 This is an exploded diagram of the inverter body, cooling fan and noise reduction mechanism of the utility model;

[0019] Figure 3 This is a cross-sectional view of the internal structure of the noise reduction cover and noise reduction pipe of the utility model;

[0020] Figure 4 This is an exploded view of the connection structure of the sealing ring and the noise reduction pipe of the utility model;

[0021] Figure 5 This is a schematic diagram of the connection structure between the gear block and the adjusting screw of the utility model;

[0022] Figure 6 This is an exploded view of the connection structure of the noise reduction pipe and the filter plate of the utility model.

[0023] In the figure: 1. Inverter body; 2. Cooling fan; 3. Mesh plate; 4. Noise reduction mechanism; 41. Noise reduction cover; 42. Noise reduction pipe; 421. Buffer guide plate; 43. First sound-absorbing board; 44. Sound-absorbing cotton; 45. Second sound-absorbing board; 46. Filter plate; 5. Sealing ring; 6. Steering assembly; 61. Gear ring; 62. Gear block; 63. Adjusting screw; 64. Bearing; 7. First threaded ring; 71. Second threaded ring. DETAILED DESCRIPTION

[0024] To make the purpose, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions in the embodiments of the present invention are clearly and completely described. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making any creative efforts are within the scope of protection of the present invention.

[0025] The embodiment of the present application provides an inverter noise reduction device to solve the problem that when the noise reduction device is damaged, there is no other device at the inverter to reduce the noise near the cooling fan, and the cooling fan airflow comes into contact with the surrounding objects when discharged into the external environment, so that the noise cannot be effectively reduced. Multi-stage noise reduction at the inverter cooling fan and control of its airflow discharge position are achieved.

[0026] In order to better understand the above technical solution, the above technical solution will be described in detail below with reference to the accompanying drawings and specific implementation methods.

[0027] The embodiment of the utility model discloses a frequency converter noise reduction device.

[0028] According to the attached Figure 1-6 As shown, the inverter includes a main body 1, a cooling fan 2 arranged inside the main body 1, and a mesh plate 3 arranged on one side of the main body 1 close to the cooling fan 2. During the operation of the inverter, the cooling fan 2 arranged therein is required to perform heat dissipation and temperature reduction operations. Figure 2 The mesh plate 3 is provided to prevent external impurities from entering the interior of the inverter through the holes opened in the inverter body 1 near the cooling fan 2.

[0029] Refer to the attached Figure 2-5 A noise reduction mechanism 4 is provided on one side of the mesh plate 3. The noise reduction mechanism 4 can realize multi-stage noise reduction at the inverter, and at the same time control the exhaust position of the airflow at the cooling fan 2 to prevent the airflow discharged from the cooling fan 2 from contacting objects that are prone to making sounds, such as plant leaves and flags. The noise reduction mechanism 4 includes a noise reduction cover 41 and a noise reduction pipe 42. The noise reduction cover 41 and the noise reduction pipe 42 are combined, and one end of the noise reduction cover 41 is fixedly connected to one side of the mesh plate 3. Figure 3 The noise reduction cover 41 is provided with a plurality of first sound absorbing panels 43, and sound absorbing cotton 44 is supported between the plurality of first sound absorbing panels 43. The noise reduction cover 41 and the first sound absorbing panels 43 and the sound absorbing cotton 44 provided inside the noise reduction cover 41 are primary noise reduction, and the noise reduction pipe 42 and the second sound absorbing panels 45 inside it are secondary noise reduction. The noise reduction pipe 42 is a bent pipe, and the interior of the noise reduction pipe 42 is staggered with a plurality of second sound absorbing panels 45, so that the flow path of the exhaust air of the cooling fan 2 is extended, the flow speed of the air flow is slowed down, thereby reducing the impact force of the air flow, so that no large noise is generated during the flow of the air. The internal bending of the noise reduction pipe 42 is provided with a buffer guide plate 421, so that when the airflow enters the interior of the noise reduction pipe 42 after passing through the primary noise reduction, it will flow to the plurality of second sound absorbing panels 45 with the assistance of the buffer guide plate 421, so as to avoid the airflow directly colliding with the internal bending of the noise reduction pipe 42. Figure 4-5 , the steering assembly 6 is arranged between the noise reduction cover 41 and the noise reduction pipe 42, the steering assembly 6 includes a gear ring 61 fixedly arranged on the outer wall of one end of the noise reduction pipe 42, a gear block 62 engaged with the outer wall of the gear ring 61, and an adjusting screw 63 for controlling the movement of the gear block 62. The position of the outlet end of the noise reduction pipe 42 is adjusted by the steering assembly 6, and the noise reduction cover 41 is fixedly provided with a sealing ring 5 at one end close to the noise reduction pipe 42. The end of the noise reduction pipe 42 provided with the gear ring 61 is rotatably arranged inside the sealing ring 5, and the gear block 62 is limited and slides inside the sealing ring 5. A bearing 64 is fixedly provided on the top surface of the gear block 62, and the outer wall of one end of the adjusting screw 63 extending to the inside of the sealing ring 5 is fixedly connected to the inner wall of the bearing 64. Through the provided bearing 64, the adjusting screw 63 and the gear block 62 can always maintain a connection state;

[0030] Specifically, when the cooling fan 2 rotates, airflow is generated around it, and the airflow flows in the blowing direction of the cooling fan 2, that is, the airflow and the noise carried by the airflow first move toward the inside of the noise reduction cover 41. At this time, the noise first contacts the first sound absorbing plate 43 and the sound absorbing cotton 44. When the sound waves of the noise are incident on the sound absorbing cotton 44, the air vibrates in the pores of the sound absorbing cotton 44. Due to the viscous resistance of the air and the friction with the hole wall, part of the sound energy is converted into heat energy, thereby reducing the reflection and propagation of the sound waves, so that the noise is initially reduced. Further, the airflow and the noise after the initial weakening continue to enter the noise reduction pipe 4 2, at this time, the multiple groups of second sound-absorbing panels 45 staggeredly arranged inside the noise reduction tube 42 weaken the noise for a second time, so that the noise carried in the airflow discharged through the noise reduction tube 42 is weaker, thereby achieving effective noise reduction at the transformer. In addition, after the transformer is installed in the use position, the situation around the use position is observed, and the noise reduction tube 42 is rotated so that the outlet end of the noise reduction tube 42 does not correspond to the place where noise is likely to occur. Then, the adjusting screw 63 is rotated so that the adjusting screw 63 controls the tooth block 62 at one end thereof to be clamped on the outer wall of the gear ring 61, thereby achieving a stable connection between the noise reduction tube 42 and the noise reduction cover 41.

[0031] Refer to the attached Figure 6 A filter plate 46 is provided at the outlet end of the noise reduction pipe 42 to prevent impurities from entering the interior of the noise reduction pipe 42. A disassembly component is provided between the filter plate 46 and the noise reduction pipe 42. The disassembly component includes a first threaded ring 7 fixedly arranged at the outlet end of the noise reduction pipe 42 and a second threaded ring 71 fixedly arranged on the outer wall of the filter plate 46. The outer wall of the second threaded ring 71 is threadedly connected to the inner wall of the first threaded ring 7, so that the filter plate 46 can be disassembled and replaced or the filter plate 46 can be disassembled and cleaned before reuse.

[0032] The above shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The above embodiments and descriptions are merely illustrative of the principles of the present invention. Various changes and improvements may be made to the present invention without departing from the spirit and scope of the present invention. Such changes and improvements are intended to fall within the scope of the present invention. The scope of protection claimed in this invention is defined by the appended claims and their equivalents.

Claims

1. A frequency converter noise reduction device, comprising a frequency converter body (1), a cooling fan (2) arranged inside the frequency converter body (1), and a mesh plate (3) arranged on a side of the frequency converter body (1) close to the cooling fan (2), characterized in that: A noise reduction mechanism (4) is provided on one side of the screen plate (3), and the noise reduction mechanism (4) comprises: A noise reduction cover (41) and a noise reduction pipe (42) are combined, and one end of the noise reduction cover (41) is fixedly connected to one side of the mesh plate (3); First sound absorbing panels (43), multiple groups of first sound absorbing panels (43) are arranged inside the noise reduction cover (41), and sound absorbing cotton (44) is supported between the multiple groups of first sound absorbing panels (43); A steering assembly (6) is arranged between the noise reduction cover (41) and the noise reduction pipe (42). The steering assembly (6) comprises a gear ring (61) fixedly arranged on the outer wall of one end of the noise reduction pipe (42), a gear block (62) engaged with the outer wall of the gear ring (61), and an adjusting screw (63) for controlling the movement of the gear block (62). The position of the outlet end of the noise reduction pipe (42) is adjusted by the steering assembly (6).

2. The inverter noise reduction device according to claim 1, characterized in that: A sealing ring (5) is fixedly provided at one end of the noise reduction cover (41) close to the noise reduction pipe (42); one end of the noise reduction pipe (42) provided with a gear ring (61) is rotatably provided inside the sealing ring (5); and the gear block (62) is limitedly slid inside the sealing ring (5).

3. The inverter noise reduction device according to claim 2, characterized in that: A bearing (64) is fixedly provided on the top surface of the tooth block (62), and the outer wall of one end of the adjusting screw (63) extending to the inside of the sealing ring (5) is fixedly connected to the inner wall of the bearing (64).

4. The inverter noise reduction device according to claim 1, characterized in that: Multiple groups of second sound absorbing panels (45) are staggeredly arranged inside the noise reduction tube (42).

5. The inverter noise reduction device according to claim 4, characterized in that: The outlet end of the noise reduction pipe (42) is provided with a filter plate (46) for preventing impurities from entering the interior of the noise reduction pipe (42), and a split assembly is provided between the filter plate (46) and the noise reduction pipe (42).

6. The inverter noise reduction device according to claim 5, characterized in that: The split assembly comprises a first threaded ring (7) fixedly arranged at the outlet end of the noise reduction pipe (42) and a second threaded ring (71) fixedly arranged on the outer wall of the filter plate (46), wherein the outer wall of the second threaded ring (71) is threadedly connected to the inner wall of the first threaded ring (7).

7. The inverter noise reduction device according to claim 1, characterized in that: The inner wall of the noise reduction pipe (42) is provided with a buffer guide plate (421).

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