Over-temperature protection device of fan frequency converter

Abstract

The utility model discloses an overtemperature protection device for a fan frequency converter, belongs to the technical field of frequency converters, and solves the problems that when a fan of an existing device extracts hot air in a protection box through an air draft pipeline, cold air entering from the outside is exhausted along with the hot air, so that the cooling efficiency is poor, and the energy consumption is increased. A frequency converter body is arranged in the protection box, an air inlet assembly is arranged at the top end of the protection box, an exhaust hopper communicated with an inner cavity of the protection box is fixedly installed in the middle of the bottom face of the protection box, an exhaust pipe is fixedly installed on the bottom face of the exhaust hopper, and an electromagnetic valve is installed in the middle of the exhaust pipe. The air inlet assembly is connected with an external cooling device, cold air can be conveyed into the protection box, hot air can be exhausted when the cold air is conveyed into the protection box by opening the electromagnetic valve, the temperature sensor can detect the temperature of the frequency converter body in real time, then the cold air is conveyed into the protection box again, energy is saved, and environment is protected. And the cooling efficiency is improved.

Description

Technical Field

[0001] This utility model relates to the field of frequency converter technology, specifically to an over-temperature protection device for a fan frequency converter. Background Technology

[0002] In actual operation, the required air volume of a fan often varies depending on different operating conditions. A frequency converter can precisely adjust the fan motor speed by changing the frequency of the output power supply, thereby enabling accurate adjustment of the fan's air volume according to actual needs.

[0003] A search revealed that patent application number 202122316480.0 discloses a frequency converter with a fault protection device. The frequency converter with the fault protection device includes: a protective enclosure; the interior of the protective enclosure is divided from right to left by a second partition and a first partition into an equipment room, a frequency converter room, and a cooling room; the first partition has a plurality of first cooling slots inside, and the second partition has a plurality of second cooling slots inside; and a fan installed on one side of the protective enclosure.

[0004] Although the inverter with fault protection device connects the cooling device to the cooling hole through a pipe, allowing the cooling gas from the cooling device to enter the interior of the cooling chamber, and then the cooling gas inside the cooling chamber to enter the inverter chamber and equipment chamber for cooling, when the fan of the inverter with fault protection device draws hot air from inside the protective box through the exhaust pipe, the density of the hot air is greater than that of the cold air. The cold air entering the protective box accumulates at the bottom of the box, causing the cold air to be drawn out along with the hot air, resulting in poor cooling efficiency and increased energy consumption.

[0005] Therefore, we proposed an over-temperature protection device for wind turbine frequency converters. Summary of the Invention

[0006] To address the shortcomings of existing technologies, this utility model provides an over-temperature protection device for a fan inverter, which solves the problem that when the fan in the existing device draws hot air from inside the protective box through the exhaust duct, the cold air entering from the outside is also drawn out along with the hot air, resulting in poor cooling efficiency and increased energy consumption.

[0007] To achieve the above objectives, this utility model is implemented through the following technical solution: a fan inverter over-temperature protection device, including a protective box, wherein the inverter body is installed inside the protective box, and a rear cover and a front cover are respectively installed on the front and rear side walls of the protective box by bolts, and a fan connected to the inverter body by a wire is fixedly installed on the back of the rear cover.

[0008] The protective box is provided with an air intake component at the top and a support component at the bottom. An exhaust hopper connected to the inner cavity of the protective box is fixedly installed in the middle of the bottom surface of the protective box. An exhaust pipe is fixedly installed on the bottom surface of the exhaust hopper, and a solenoid valve is installed in the middle of the exhaust pipe.

[0009] The air intake assembly includes two hollow air collection pipes, which are fixedly installed on the front and rear sides of the top of the inner wall of the protective box. The inverter body is located in the middle of the two air collection pipes. The bottom surface of the air collection pipes is fixedly installed with evenly distributed air distribution pipes. The top surface of the protective box is provided with a U-shaped pipe. The two ends of the U-shaped pipe penetrate the top surface of the protective box and are fixedly installed on the top surface of the two air collection pipes respectively. The middle of the top surface of the U-shaped pipe is fixedly installed with an air intake pipe connected to the air outlet of the external cooling device.

[0010] Preferably, temperature sensors are fixedly installed in the middle of the left and right sides of the inner wall of the protective box, and a control panel is fixedly installed on the left side of the outer surface of the protective box. The temperature sensors, solenoid valves, and external cooling devices are all connected to the control panel through wires. The temperature sensors detect the temperature around the inverter body in real time and transmit the temperature data to the control panel. The control panel can then control the opening and closing of the solenoid valves and control the start and stop of the external cooling devices. This control method is existing technology and will not be described in detail here.

[0011] Preferably, a mounting plate is fixedly installed in the middle of the top surface of the inner wall of the protective box, and L-shaped plates are fixedly installed on both the left and right sides of the top surface of the inverter body. The L-shaped plates are detachably installed on the side wall of the mounting plate by bolts, so as to facilitate the installation of the inverter body inside the protective box.

[0012] Preferably, the support assembly includes support rods and cross plates. The support rods are fixedly installed at the four corners of the bottom surface of the protective box, and the cross plates are fixedly installed on the bottom surface of the support rods. The protective box is supported by the support assembly.

[0013] Preferably, an observation opening is provided in the middle of the front cover, and an observation window is installed on the inner wall of the observation opening, so as to facilitate observation of the internal condition of the protective box.

[0014] This utility model provides an over-temperature protection device for a fan frequency converter. It has the following beneficial effects:

[0015] This fan inverter over-temperature protection device connects to an external cooling device via an air intake assembly. It delivers cool air into the protective enclosure. Opening the solenoid valve allows hot air to escape while cool air is being supplied, filling the enclosure with cool air to cool the inverter itself. A temperature sensor continuously monitors the inverter's temperature, allowing for timely replenishment of cool air into the enclosure to further cool the inverter. This reduces the energy consumption of the external cooling device, promoting energy conservation and environmental protection. It also improves cooling efficiency and solves the problem in existing devices where externally supplied cool air is drawn out along with the hot air when the fan extracts heat from the enclosure through the exhaust duct, resulting in poor cooling efficiency and increased energy consumption. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the structure of this utility model;

[0017] Figure 2 This is a side view of the structure of this utility model;

[0018] Figure 3 This is a schematic diagram of the internal structure of the protective box of this utility model;

[0019] Figure 4 This is a schematic diagram of the air intake assembly structure of this utility model.

[0020] In the diagram: 1. Protective housing; 11. Rear cover; 12. Front cover; 121. Observation window; 13. Fan; 14. Exhaust hopper; 15. Exhaust pipe; 16. Solenoid valve; 17. Mounting plate; 2. Support assembly; 21. Support rod; 22. Horizontal plate; 3. Air intake assembly; 31. Air collection pipe; 32. Air distribution pipe; 33. U-shaped pipe; 34. Air intake pipe; 4. Inverter body; 41. L-shaped plate; 5. Temperature sensor; 6. Control panel. Detailed Implementation

[0021] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model. Example

[0022] like Figure 1-4 As shown: It includes a protective box 1, inside which is installed a frequency converter body 4. The front and rear side walls of the protective box 1 are respectively bolted with a rear cover 11 and a front cover 12. A fan 13 is fixedly installed on the back of the rear cover 11 and connected to the frequency converter body 4 through a wire.

[0023] An air intake assembly 3 is provided at the top of the protective box 1, a support assembly 2 is provided at the bottom of the protective box 1, an exhaust hopper 14 communicating with its inner cavity is fixedly installed in the middle of the bottom surface of the protective box 1, an exhaust pipe 15 is fixedly installed on the bottom surface of the exhaust hopper 14, and a solenoid valve 16 is installed in the middle of the exhaust pipe 15.

[0024] The air intake assembly 3 includes two hollow air collection pipes 31. The air collection pipes 31 are fixedly installed on the front and rear sides of the top of the inner wall of the protective box 1, and the inverter body 4 is located in the middle of the two air collection pipes 31. The bottom surface of the air collection pipes 31 is fixedly installed with uniformly distributed air distribution pipes 32. The top surface of the protective box 1 is provided with a U-shaped pipe 33. The two ends of the U-shaped pipe 33 penetrate the top surface of the protective box 1 and are fixedly installed on the top surface of the two air collection pipes 31 respectively. The middle of the top surface of the U-shaped pipe 33 is fixedly installed with an air intake pipe 34 connected to the air outlet of the external cooling device.

[0025] Furthermore, temperature sensors 5 are fixedly installed in the middle of the left and right sides of the inner wall of the protective box 1, and a control panel 6 is fixedly installed on the left side of the outer surface of the protective box 1. The temperature sensors 5, solenoid valve 16 and external cooling device are all connected to the control panel 6 through wires.

[0026] The temperature sensor 5 detects the temperature around the inverter body 4 in real time and transmits the temperature data to the control panel 6. The control panel 6 can then control the opening and closing of the solenoid valve 16 and control the start and stop of the external cooling device. This control method is existing technology and will not be described in detail here.

[0027] Furthermore, a mounting plate 17 is fixedly installed in the middle of the top surface of the inner wall of the protective box 1, and L-shaped plates 41 are fixedly installed on both the left and right sides of the top surface of the inverter body 4. The L-shaped plates 41 are detachably installed on the side wall of the mounting plate 17 by bolts.

[0028] This is to facilitate the installation of the inverter body 4 inside the protective box 1.

[0029] Furthermore, the support assembly 2 includes a support rod 21 and a horizontal plate 22. The support rod 21 is fixedly installed at the four corners of the bottom surface of the protective box 1, and the horizontal plate 22 is fixedly installed on the bottom surface of the support rod 21. The protective box 1 is supported by the support assembly 2.

[0030] Furthermore, an observation opening is provided in the middle of the front cover 12, and an observation window 121 is installed on the inner wall of the observation opening;

[0031] The observation window 121 allows for easy observation of the internal condition of the protective box 1.

[0032] The working principle and usage process of this utility model: When using this fan inverter over-temperature protection device, cold air is delivered to the U-shaped pipe 33 and the air collection pipe 31 through the air inlet pipe 34 via the external cooling device. Then, the cold air is discharged into both sides of the top of the protective box 1 through the air distribution pipe 32. At the same time, the solenoid valve 16 is opened. During this process, the cold air squeezes the hot air inside the protective box 1 downward, causing the hot air to be discharged through the exhaust hopper 14 and the exhaust pipe 15. The temperature sensor 5 detects the temperature around the inverter body 4. When the internal temperature of the inverter body 4 drops to the normal range, the solenoid valve 16 and the external cooling device can be closed, and the cold air is then retained inside the support component 2. When the temperature sensor 5 detects that the temperature around the support component 2 rises, the solenoid valve 16 and the external cooling device are opened again, and cold air is injected into the support component 2, and the hot air inside the support component 2 is discharged. This process is repeated to cool down the inverter body 4.

[0033] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. It will be apparent to those skilled in the art that this utility model is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or basic characteristics of this utility model. Therefore, the embodiments should be considered exemplary and non-limiting in all respects. The scope of this utility model is defined by the appended claims rather than the foregoing description, and thus all variations falling within the meaning and scope of equivalents of the claims are intended to be included within this utility model. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0034] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A fan frequency converter over-temperature protection device, comprising a protection box (1), a frequency converter body (4) is arranged in the protection box (1), a rear cover body (11) and a front cover body (12) are respectively arranged on the front and rear sidewalls of the protection box (1) through bolts, a fan (13) is fixedly arranged on the back of the rear cover body (11) and connected with the frequency converter body (4) through wires; characterized in that an air inlet assembly (3) is arranged at the top of the protection box (1), a supporting assembly (2) is arranged at the bottom of the protection box (1), a gas discharge hopper (14) is fixedly arranged at the middle of the bottom surface of the protection box (1) and communicates with the inner cavity thereof, an exhaust pipe (15) is fixedly arranged at the bottom surface of the gas discharge hopper (14), and an electromagnetic valve (16) is arranged at the middle of the exhaust pipe (15); the air inlet assembly (3) comprises two hollow gas collectors (31), the gas collectors (31) are fixedly arranged at the front and rear sides of the top inner wall of the protection box (1), and the frequency converter body (4) is located at the middle of the two gas collectors (31), uniform gas distributors (32) are fixedly arranged on the bottom surface of the gas collectors (31), a U-shaped pipe (33) is arranged on the top surface of the protection box (1), both ends of the U-shaped pipe (33) penetrate through the top surface of the protection box (1) and are fixedly arranged on the top surfaces of the two gas collectors (31), respectively, and an air inlet pipe (34) is fixedly arranged at the middle of the top surface of the U-shaped pipe (33) and connected with the air outlet end of an external cooling device.

2. The over-temperature protection device for fan frequency converter according to claim 1, characterized in that: temperature sensors (5) are fixedly arranged at the middle of the left and right sides of the inner wall of the protection box (1), a control panel (6) is fixedly arranged on the left side of the outer surface of the protection box (1), the temperature sensors (5), the electromagnetic valve (16) and the external cooling device are connected with the control panel (6) through wires.

3. The over-temperature protection device for fan frequency converter according to claim 1, characterized in that: an installation plate (17) is fixedly arranged at the middle of the top surface of the inner wall of the protection box (1), L-shaped plates (41) are fixedly arranged at the left and right sides of the top surface of the frequency converter body (4), and the L-shaped plates (41) are detachably arranged on the sidewalls of the installation plate (17) through bolts.

4. The over-temperature protection device for fan frequency converter of claim 1, wherein: the supporting assembly (2) comprises supporting rods (21) and a cross plate (22), the supporting rods (21) are fixedly arranged at the four corners of the bottom surface of the protection box (1), and the cross plate (22) is fixedly arranged on the bottom surface of the supporting rods (21).

5. The over-temperature protection device for a frequency converter of a fan according to claim 1, characterized by: an observation port is arranged at the middle of the front cover body (12), and an observation window (121) is arranged on the inner wall of the observation port.

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