Protection device of frequency converter

Abstract

The utility model discloses a frequency converter protection device, which comprises a protection shell, the left side and the right side of the protection shell are detachably connected with mounting seats, the mounting seats penetrate through and extend into the protection shell, the inner wall of each mounting seat is fixedly provided with a heat dissipation fan, the inner wall of each mounting seat is provided with an annular groove, and the annular groove is internally provided with a heat dissipation fan. And a driving motor is fixedly mounted on the front surface of the mounting seat. According to the utility model, the mounting seats and the dustproof plates are arranged on the two sides of the protective shell, so that dust is blocked while ventilation and heat dissipation are realized, the damage of the dust to the internal frequency converter is avoided, the frequency converter is protected, and the plurality of groups of dustproof plates can be driven by the driving motor to rotate to cooperate with the annular groove, and the used dustproof plates can be replaced without shutdown. And the replaced dustproof plate can be cleaned through the cleaning assembly, so that the operation steps of personnel are reduced, the heat dissipation efficiency is ensured, and the risk caused by overheating or dust erosion of the frequency converter is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of frequency converter protection, specifically, a protection device for a frequency converter. Background Art

[0002] With the depletion of natural resources, frequency converters, as energy-saving products, are increasingly used in industrial applications such as motor drives.

[0003] In a boiler, primary air is introduced by a primary air fan and is used to carry pulverized coal into the furnace; secondary air is introduced by a secondary air fan and is used to supplement the air required for combustion. After being distributed by a large air box, it is blown into the furnace in a layered arrangement. Among them, secondary air generally accounts for 60% of the total boiler air volume. Among them, when introducing secondary air, it must be carried out gradually and slowly according to the continuous increase of load and furnace temperature, and it is necessary to avoid rapid and large-scale introduction. Because when the boiler is just put into operation, the internal heat intensity of the furnace is still very low and the system combustion is not stable enough. At this time, if a large amount of low-temperature secondary air is introduced quickly, it will inevitably cause large fluctuations in the furnace temperature and bring difficulties to operation adjustment. To solve the above problems, a frequency converter is usually installed on the secondary air fan to adjust the secondary air and make the operation of the secondary air fan more reliable and stable.

[0004] However, in the production space of boilers, there is generally too much coal ash and other dust, which easily enters the frequency converter and causes internal faults of the frequency converter.

[0005] The patent with application number CN201820228438.9 discloses a protection device for a frequency converter. The protection device for a frequency converter includes a protective shell. A placement chamber for placing the frequency converter is provided inside the protective shell. A cabinet door for opening and closing the placement chamber is provided on the protective shell. An air outlet and an air inlet are also provided on the side wall of the protective shell. A first fan is provided at the air outlet, and an isolation member for preventing dust from entering the inside of the placement chamber is provided outside the air inlet, which has the advantages of reducing the contact between dust and the frequency converter and improving the safety of the frequency converter.

[0006] This structure realizes heat dissipation and dust prevention through the cooperation of a cloth bag and a fan. However, in actual use, it is necessary to manually replace the dust-proof component, which increases the labor intensity of personnel. Moreover, during the replacement process, the equipment needs to be shut down, which cannot guarantee the safety of the frequency converter inside the protective shell and is easily eroded by dust. Utility Model Content

[0007] Aiming at the problems existing in the prior art, the purpose of the utility model is to provide a protection device for a frequency converter to solve the problems in the background art.

[0008] To achieve the above purpose, the utility model adopts the following technical solutions;

[0009] A protection device for a frequency converter, comprising a protection housing, both the left and right sides of the protection housing are detachably connected with mounting seats, the mounting seats penetrate and extend into the interior of the protection housing, a heat dissipation fan is fixedly installed on the inner wall of the mounting seat, an annular groove is opened on the inner wall of the mounting seat, a driving motor is fixedly installed on the front surface of the mounting seat, the output shaft of the driving motor penetrates the mounting seat and extends into the interior of the annular groove, a uniformly distributed dust-proof plate is fixedly connected to the output shaft of the driving motor, the side of the dust-proof plate is attached to the inner wall of the annular groove, a cleaning assembly is arranged inside the mounting seat, a processor and a temperature sensor are installed inside the protection housing, and the temperature sensor, the heat dissipation fan, the cleaning assembly and the driving motor are all signal-connected to the processor.

[0010] The cleaning assembly includes a cleaning seat, the cleaning seat is installed at the bottom of the mounting seat, two extension seats are fixedly connected to the top of the cleaning seat, the extension seats are located on the back surface of the mounting seat and penetrate into the interior of the mounting seat, two servo motors are fixedly installed on the back surface of the extension seats, the output shafts of the servo motors penetrate and extend into the interior of the mounting seat, a lead screw is fixedly connected to the output shafts of the servo motors, a dust suction seat is threadedly connected to the lead screw, the dust suction seat is located inside the extension seat and is slidably connected to the top of the cleaning seat, dust exhaust fans arranged at equal distances are installed on the inner wall of the dust suction seat, a sealed rotary belt is rotatably connected to the inner wall of the cleaning seat, an air pipe communicated with the inside thereof is fixedly connected to the bottom of the dust suction seat, the air pipe penetrates and extends to the inner side of the sealed rotary belt, and one-way valves are installed on both the left and right sides of the cleaning seat.

[0011] As a further description of the above technical solution: The outer side of the sealed rotary belt is slidably sealed with the inner wall of the cleaning seat.

[0012] As a further description of the above technical solution: A signal transmission module is installed inside the protection housing, and the signal transmission module is signal-connected to the processor.

[0013] As a further description of the above technical solution: The opening of the mounting seat faces downward, and an arc-shaped edge is opened on the inner wall of the mounting seat.

[0014] As a further description of the above technical solution: Through grooves arranged at equal distances are opened on the dust suction seat, and the through grooves on the two dust suction seats are arranged in a staggered manner.

[0015] Compared with the prior art, the advantages of the present utility model are as follows:

[0016] In the present utility model, by providing mounting seats and dust-proof plates on both sides of the protective housing, ventilation and heat dissipation are achieved while dust is blocked, preventing dust from damaging the internal frequency converter to protect the frequency converter. Moreover, multiple groups of dust-proof plates can be driven by a drive motor to rotate and cooperate with an annular groove, enabling the replacement of the dust-proof plates without shutting down the machine, which is not prone to blockage. Additionally, through the cleaning component, the replaced dust-proof plates can be cleaned, reducing the operation steps of personnel, ensuring the heat dissipation efficiency, and reducing the risks caused by overheating or dust erosion of the frequency converter. Description of the Drawings

[0017] Figure 1 It is a three-dimensional structural schematic diagram of the present utility model;

[0018] Figure 2 It is a sectional structural schematic diagram of the mounting seat of the present utility model;

[0019] Figure 3 It is a front sectional structural schematic diagram of the cleaning component of the present utility model;

[0020] Figure 4 It is a side sectional structural schematic diagram of the cleaning component of the present utility model.

[0021] Figure 5 It is a schematic diagram of the principle of the present utility model.

[0022] Explanation of the reference numerals in the drawings:

[0023] 1. Protective housing; 2. Mounting seat; 3. Heat dissipation fan; 4. Annular groove; 5. Drive motor; 6. Dust-proof plate; 7. Cleaning component; 701. Cleaning seat; 702. Extension seat; 703. Servo motor; 704. Dust suction seat; 705. Dust exhaust fan; 706. Sealed rotary belt; 707. Air pipe; 708. Check valve; 8. Processor; 9. Temperature sensor; 10. Signal transmission module; 11. Through groove. Detailed Embodiment

[0024] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the drawings in the embodiments of the present utility model.

[0025] Please refer to Figures 1 to 5, in the present utility model, a protection device for a frequency converter includes a protection housing 1. Both the left and right sides of the protection housing 1 are detachably connected to mounting seats 2. The mounting seats 2 penetrate and extend into the interior of the protection housing 1. A heat dissipation fan 3 is fixedly installed on the inner wall of the mounting seat 2. An annular groove 4 is formed on the inner wall of the mounting seat 2. A driving motor 5 is fixedly installed on the front surface of the mounting seat 2. The output shaft of the driving motor 5 penetrates the mounting seat 2 and extends into the interior of the annular groove 4. A uniformly distributed dust-proof plate 6 is fixedly connected to the output shaft of the driving motor 5. The side of the dust-proof plate 6 is in contact with the inner wall of the annular groove 4. A cleaning assembly 7 is arranged inside the mounting seat 2. A processor 8 and a temperature sensor 9 are installed inside the protection housing 1. The temperature sensor 9, the heat dissipation fan 3, the cleaning assembly 7, and the driving motor 5 are all in signal connection with the processor 8.

[0026] The cleaning assembly 7 includes a cleaning seat 701. The cleaning seat 701 is installed at the bottom of the mounting seat 2. Two extension seats 702 are fixedly connected to the top of the cleaning seat 701. The extension seats 702 are located on the back surface of the mounting seat 2 and penetrate into the interior of the mounting seat 2. Two servo motors 703 are fixedly installed on the back surface of the extension seats 702. The output shafts of the servo motors 703 penetrate and extend into the interior of the mounting seat 2. A lead screw is fixedly connected to the output shafts of the servo motors 703. A dust suction seat 704 is threadedly connected to the lead screw. The dust suction seat 704 is located inside the extension seat 702 and is slidably connected to the top of the cleaning seat 701. Dust exhaust fans 705 arranged at equal distances are installed on the inner wall of the dust suction seat 704. A sealed rotary belt 706 is rotatably connected to the inner wall of the cleaning seat 701. An air pipe 707 communicating with the inside of the dust suction seat 704 is fixedly connected to the bottom of the dust suction seat 704. The air pipe 707 penetrates and extends to the inner side of the sealed rotary belt 706. One-way valves 708 are installed on both the left and right sides of the cleaning seat 701.

[0027] The outer side of the sealed rotary belt 706 is slidably sealed with the inner wall of the cleaning seat 701; through grooves 11 arranged at equal distances are formed on the dust suction seat 704. The through grooves 11 on the two dust suction seats 704 are arranged staggeredly.

[0028] The frequency converter is installed inside the protective housing 1, and the protective housing 1 protects the frequency converter. Mounting seats 2 are installed on both sides of the protective housing 1. The inside of the mounting seats 2 is communicated with the inside of the protective housing 1 to realize the circulation of air. A temperature sensor 9 is installed inside the protective housing 1 to monitor the temperature inside the protective housing 1 in real time. The processor 8 receives the transmitted value. If the temperature value is lower than the set value and will not cause harm to the frequency converter, the air will achieve natural ventilation through the mounting seats 2 on both sides. If the temperature value is relatively high, the processor 8 will control the operation of the cooling fans 3. The cooling fans 3 on both sides face the same direction, so that the external air flow quickly enters the inside of the mounting seat 2, penetrates through the dust-proof plate 6 and then enters the inside of the protective housing 1. The cooling fans 3 in the mounting seat 2 on the other side discharge the air flow containing heat inside the protective housing 1 into the external air, thereby accelerating the air circulation speed and improving the heat dissipation efficiency. During the air circulation process, the air flow inside the mounting seat 2 will penetrate through the dust-proof plate 6, and the dust-proof plate 6 can block the dust attached to the air flow. The processor 8 will intermittently control the operation of the drive motor 5 and the cleaning component 7. The drive motor 5 drives a plurality of dust-proof plates 6 fixedly connected thereto to rotate clockwise until the top dust-proof plate 6 is rotated to the bottom. During this process, the dust-proof plate 6 continuously fits with the inner wall of the annular groove 4, so as not to affect the air flow. After rotating to the bottom, the drive motor 5 stops and the equipment operates normally. The processor 8 controls the servo motor 703, the dust exhaust fan 705 and the one-way valve 708 to open. At this time, a plurality of dust exhaust fans 705 operate to send the gas inside the dust suction seat 704 into the inside of the cleaning seat 701 through the air pipe 707, so that the staggered through grooves 11 on both sides generate suction force. The dust attached to the dust-proof plate 6 begins to enter the inside of the through groove 11 and then enters the inside of the cleaning seat 701 through the air pipe 707. As the air flow continuously enters until it is discharged into the environment through the one-way valve 708. The servo motor 703 drives the lead screw fixedly connected thereto to rotate, and the dust suction seat 704 threadedly connected to the lead screw begins to move horizontally. The air pipe 707 pulls the sealed rotary belt 706 to move synchronously to always keep the cleaning seat 701 sealed. As the servo motor 703 continuously rotates, the dust suction seat 704 completely cleans the surface of the dust-proof plate 6. Then, when the servo motor 703 rotates in the reverse direction, the dust suction seat 704 can be sent back into the extension seat 702 without affecting the subsequent rotation of the dust-proof plate 6.

[0029] In the utility model, by arranging the mounting seats 2 and the dust-proof plates 6 on both sides of the protective housing 1, ventilation and heat dissipation are realized while dust is blocked, avoiding dust from causing harm to the internal frequency converter to protect the frequency converter. Moreover, a plurality of dust-proof plates 6 can be driven by the drive motor 5 to rotate and cooperate with the annular groove 4 to replace the dust-proof plate 6 without stopping the machine, which is not easy to be blocked. And through the cleaning component 7, the replaced dust-proof plate 6 can be cleaned, reducing the operation steps of personnel, ensuring the heat dissipation efficiency and reducing the risk of the frequency converter caused by overheating or dust erosion.

[0030] Please refer toFigure 5 , wherein a signal transmission module 10 is installed inside the protective housing 1, and the signal transmission module 10 is signal-connected to the processor 8.

[0031] In the present utility model, after the value transmitted back by the temperature sensor 9 continuously exceeds the set value, the processor 8 will control the operation of the signal transmission module 10, and the signal transmission module 10 realizes remote signal transmission to prompt maintenance personnel for timely maintenance.

[0032] Please refer to Figure 2 , wherein the opening of the mounting seat 2 faces downward, and an arc-shaped edge is provided on the inner wall of the mounting seat 2.

[0033] In the present utility model, the mounting seat 2 with a downward opening can prevent rainwater from entering, and can also reduce the entry of dust, thereby avoiding the harm of rainwater and dust to the frequency converter. Moreover, the arc-shaped edge on the side can play a guiding role in the air flow, avoiding the impact of the air flow on the bending part of the mounting seat 2 and affecting the service life of the mounting seat 2.

[0034] The above is only the preferred specific embodiment of the present utility model; however, the protection scope of the present utility model is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present utility model, according to the technical solution of the present utility model and its improved concept, makes equivalent substitutions or changes, and should be covered by the protection scope of the present utility model.

Claims

1. A protection device for a frequency converter, comprising a protective housing (1), characterized in that: The left and right sides of the protective shell (1) are detachably connected with a mounting seat (2), the mounting seat (2) penetrates and extends into the interior of the protective shell (1), a heat dissipation fan (3) is fixedly installed on the inner wall of the mounting seat (2), an annular groove (4) is provided on the inner wall of the mounting seat (2), a driving motor (5) is fixedly installed on the front of the mounting seat (2), the output shaft of the driving motor (5) penetrates the mounting seat (2) and extends into the interior of the annular groove (4), the output shaft of the driving motor (5) is fixedly connected with uniformly distributed dustproof plates (6), the side edges of the dustproof plates (6) are in contact with the inner wall of the annular groove (4), a cleaning component (7) is arranged inside the mounting seat (2), a processor (8) and a temperature sensor (9) are installed inside the protective shell (1), and the temperature sensor (9), the heat dissipation fan (3), the cleaning component (7) and the driving motor (5) are all connected to the processor (8) by signal. The cleaning assembly (7) comprises a cleaning seat (701), wherein the cleaning seat (701) is mounted at the bottom of the mounting seat (2), and the top of the cleaning seat (701) is fixedly connected with two extension seats (702), wherein the extension seats (702) are located at the back of the mounting seat (2) and penetrate into the interior of the mounting seat (2), and two servo motors (703) are fixedly mounted on the back of the extension seat (702), and the output shafts of the servo motors (703) penetrate and extend into the interior of the mounting seat (2), and the output shafts of the servo motors (703) are fixedly connected with a screw rod, and the screw rod is threadedly connected with a dust suction seat (704), and the dust suction seat (704) is located inside the extension seat (702) and slidably connected to the top of the cleaning seat (701), and dust exhaust fans (705) arranged at equal distances are installed on the inner wall of the dust suction seat (704); A sealing rotating belt (706) is rotatably connected to the inner wall of the cleaning seat (701), and an air pipe (707) communicating with the interior of the cleaning seat (704) is fixedly connected to the bottom of the dust collecting seat (704), wherein the air pipe (707) passes through and extends to the inner side of the sealing rotating belt (706), and one-way valves (708) are installed on both the left and right sides of the cleaning seat (701).

2. The protection device for a frequency converter according to claim 1, characterized in that: The outer side of the sealing rotating belt (706) is slidably sealed with the inner wall of the cleaning seat (701).

3. The protection device for a frequency converter according to claim 1, characterized in that: A signal transmission module (10) is installed inside the protective shell (1), and the signal transmission module (10) is connected to the processor (8) by signal.

4. The protection device for a frequency converter according to claim 1, characterized in that: The opening of the mounting seat (2) faces downward, and an arc-shaped edge is provided on the inner wall of the mounting seat (2).

5. The protection device for a frequency converter according to claim 1, characterized in that: The dust suction seat (704) is provided with through grooves (11) arranged at equal distances, and the through grooves (11) on the two dust suction seats (704) are arranged in a staggered manner.

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