Frequency converter with waterproof function

Abstract

The utility model discloses a frequency converter with a waterproof function, which comprises a shell with an opening in the front side, a circuit board fixedly mounted on the inner side of a back plate of the shell and a wiring terminal strip fixed at the lower end of the circuit board, an upper cover plate and a lower cover plate are fixedly mounted on the front side of the shell respectively, and a partition plate is integrally connected to the inner side of the lower end of the upper cover plate. The rear edge of the partition plate abuts against the circuit board and is used for separating the wiring terminal strip from other electronic components on the circuit board. Through holes are formed in the bottoms of the two side plates of the shell, and waterproof connectors are connected in the through holes and used for sealing and leading out wires connected to the wiring terminal strip. According to the utility model, on the basis of facilitating wiring, the waterproof and moisture-proof functions are realized, so that the internal circuit board and electronic components on the circuit board can be protected from being corroded, and the influence of a humid working environment is avoided.

Description

Technical Field

[0001] The utility model relates to the technical field of frequency converters, in particular to a frequency converter with a waterproof function. Background Art

[0002] The frequency converter is an electric power control device that applies frequency conversion technology and microelectronics technology to control the AC motor by changing the working power frequency of the motor. It mainly relies on the opening and closing of the internal IGBT to adjust the voltage and frequency of the output power supply, and provides the required power supply voltage according to the actual needs of the motor, thereby achieving the purpose of energy saving and speed regulation. In addition, the frequency converter also has many protection functions, such as over-current, over-voltage, overload protection, etc.

[0003] With the continuous improvement of industrial automation, frequency converters have also been widely used, among which frequency converters are also used in air coolers for indoor ventilation and cooling. At present, since air coolers use the outside air to exchange heat with the water flowing through their porous wet curtains, that is, they use the evaporative cooling principle to achieve the purpose of indoor ventilation and cooling, the frequency converter will be in a humid working environment. Therefore, it is necessary to design a frequency converter with waterproof function to protect the internal circuit board and the electronic components on it from corrosion. Utility Model Content

[0004] The purpose of the utility model is to overcome the defects and shortcomings of the prior art and to provide a frequency converter with a waterproof function, so as to protect the circuit board inside the frequency converter and the electronic components thereon from being corroded and not being affected by the humid working environment.

[0005] In order to achieve the above purpose, the utility model provides the following technical solutions:

[0006] A frequency converter with waterproof function, comprising a shell with an open front side, a circuit board fixedly mounted on the inner side of the back plate of the shell and a terminal block fixed to the lower end of the circuit board, characterized in that: an upper cover plate and a lower cover plate are fixedly mounted on the front side of the shell, a partition plate is integrally connected to the inner side of the lower end of the upper cover plate, the rear edge of the partition plate abuts against the circuit board, and is used to separate the terminal block from other electronic components on the circuit board; through holes are provided at the bottom of the two side plates of the shell, and waterproof connectors are connected in the through holes for sealing and for leading out the wiring connected to the terminal block.

[0007] Furthermore, two side inner walls of the shell are integrally connected to two horizontal bars at the upper side near the location of the terminal block, a slot is formed between the two horizontal bars, and the two side edges of the partition are inserted into the slots on both sides from the outside to the inside.

[0008] Furthermore, a pressure strip is integrally connected to the rear edge of the partition, and a sealing strip extending along the length direction thereof is fixedly connected to the rear edge of the pressure strip, and the sealing strip abuts against the circuit board.

[0009] Furthermore, a plurality of reinforcing ribs are integrally connected between the pressure strip and the bottom surface of the partition.

[0010] Furthermore, both sides of the inner side surfaces of the upper cover plate and the lower cover plate are provided with card slots, and the card slots are card-connected to the two side edges of the front side of the shell.

[0011] Furthermore, a baffle is integrally connected to the upper edge of the lower cover plate, and the baffle abuts against the lower edge of the upper cover plate.

[0012] Furthermore, a heat dissipation window is provided on the back plate of the shell, and a radiator covering the heat dissipation window is fixedly mounted on the back side of the shell.

[0013] Furthermore, a mounting seat is fixedly mounted on the top end of the shell, and mounting holes are provided on both sides of the bottom end of the shell.

[0014] Furthermore, both side edges of the front side of the shell are provided with a plurality of screw holes, and both sides of the upper cover plate and the lower cover plate are provided with a plurality of through holes corresponding to the plurality of screw holes one by one, and screws pass through the through holes and are screwed into the corresponding screw holes to fix the upper cover plate and the lower cover plate on the front side of the shell respectively.

[0015] Compared with the prior art, the beneficial effects of the utility model are:

[0016] 1. The utility model adopts two cover plates, wherein the lower end of the upper cover plate is provided with a partition plate, which can separate the terminal row at the lower end of the circuit board from other electronic components thereon, and connects waterproof connectors at the bottom of both sides of the shell, which has the functions of waterproofing and moisture-proofing on the basis of convenient wiring, thereby protecting the internal circuit board and the electronic components thereon from corrosion and being affected by the humid working environment.

[0017] 2. The utility model installs the radiator on the back of the shell, that is, the radiator is placed externally, and the airflow inside the air cooler can be used to achieve heat dissipation. There is no need to install a fan inside, which saves costs.

[0018] 3. The utility model has a mounting seat fixedly mounted on the top of the shell, and mounting holes are arranged on both sides of the bottom of the shell, that is, two mounting modes are provided for selection, and flexible installation can be achieved. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 The structure of the utility model is shown in FIG. Figure 1 .

[0020] Figure 2 The structure of the utility model is shown in FIG. Figure 2 .

[0021] Figure 3 The structure of the utility model is shown in FIG. Figure 3 (without lower cover).

[0022] Figure 4 The internal structure of the utility model is shown in FIG. Figure 1 .

[0023] Figure 5 The internal structure of the utility model is shown in FIG. Figure 2 .

[0024] Figure 6 for Figure 5 Schematic diagram of the enlarged structure of part A.

[0025] Figure 7 This is a schematic diagram of the structure of the upper cover plate in the utility model.

[0026] Figure 8 for Figure 7 Schematic diagram of the enlarged structure of part B.

[0027] Fig. 9 It is a structural schematic diagram of the lower cover plate in the utility model. DETAILED DESCRIPTION

[0028] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0029] See also Figure 1-9 A frequency converter with waterproof function comprises a shell 1 with an open front side, a circuit board 2 fixedly mounted on the inner side of the back plate of the shell 1 and a terminal block 3 fixed on the lower end of the circuit board 2. An upper cover plate 4 and a lower cover plate 5 are fixedly mounted on the front side of the shell 1 respectively. A partition plate 6 is integrally connected to the inner side of the lower end of the upper cover plate 4. The rear edge of the partition plate 6 abuts against the circuit board 2 to separate the terminal block 3 from other electronic components (resistors, capacitors, IGBT modules, etc.) on the circuit board 2. Through holes 7 are provided at the bottom of both side plates of the shell 1. A waterproof connector 8 is connected in the through hole 7 to seal and allow the wiring connected to the terminal block 3 to be led out.

[0030] In the utility model, two side inner walls of the shell 1 are integrally connected to two horizontal bars 9 on the upper side near the location of the terminal block 3, and a slot 10 is formed between the two horizontal bars 9. The side edges of the partition 6 are inserted into the slots 10 on both sides from the outside to the inside, so as to fix the partition 6 and help improve the sealing.

[0031] It should be noted that a sealing strip 22 should be fixedly connected to the inner side surface of the back plate of the shell 1 between the two side slots 10. Therefore, after the circuit board 2 is fixedly installed on the inner side of the back plate of the shell 1, the circuit board 2 abuts against the sealing strip 22, which is conducive to improving the sealing and improving the waterproof and moisture-proof performance.

[0032] In the utility model, the rear edge of the partition 6 is integrally connected with a pressure strip 11, and the rear edge of the pressure strip 11 is fixedly connected with a sealing strip 23 extending along its length direction. The sealing strip 23 abuts against the circuit board 2, which is beneficial to improve the sealing performance and improve the waterproof and moisture-proof performance.

[0033] In the present invention, a plurality of reinforcing ribs 12 are integrally connected between the pressure strip 11 and the bottom surface of the partition 6 , so as to strengthen the strength of the partition 6 .

[0034] In the present invention, both sides of the inner side surfaces of the upper cover plate 4 and the lower cover plate 5 are provided with card slots 13, and the card slots 13 are card-connected to the two side edges of the front side of the housing 1, so as to improve the sealing performance.

[0035] In the present invention, the upper edge of the lower cover plate 5 is integrally connected with a stop bar 21 , and the stop bar 21 abuts against the lower edge of the upper cover plate 4 , thereby increasing the contact area with the upper cover plate 4 , thereby facilitating improved sealing.

[0036] In the utility model, a heat dissipation window 14 is provided on the back plate of the housing 1 , and a heat sink 15 covering the heat dissipation window 14 is fixedly mounted on the back of the housing 1 .

[0037] It should be noted that after installing the radiator 15 , a circle of sealant should be applied around the radiator 15 to eliminate the gap between the radiator 15 and the back of the housing 1 , thereby improving the sealing performance.

[0038] In the present invention, a mounting seat 16 is fixedly mounted on the top of the housing 1, and mounting holes 17 are provided on both sides of the bottom of the housing 1, thereby providing two mounting modes for selection and realizing flexible installation.

[0039] In the utility model, both side edges of the front side of the shell 1 are provided with a plurality of screw holes 20, and both sides of the upper cover plate 4 and the lower cover plate 5 are provided with a plurality of through holes 18 corresponding to the plurality of screw holes 20 one by one, and screws 19 pass through the through holes 18 and are screwed into the corresponding screw holes 20, so as to realize that the upper cover plate 4 and the lower cover plate 5 are respectively fixedly installed on the front side of the shell 1.

[0040] The utility model is further described below in conjunction with the accompanying drawings:

[0041] Since the utility model adopts two cover plates, namely the upper cover plate 4 and the lower cover plate 5, wherein the lower end of the upper cover plate 4 is provided with a partition plate 6, which can separate the terminal block 3 at the lower end of the circuit board 2 from other electronic components (resistors, capacitors, IGBT modules, etc.) thereon, and waterproof connectors 8 are connected to the bottom of both sides of the shell 1, therefore, on the basis of convenient wiring, the entire inverter has the functions of waterproofing and moisture-proofing, thereby being able to protect the internal circuit board 2 and the electronic components thereon from being corroded and not being affected by the humid working environment.

[0042] In addition, since the utility model installs the radiator 15 on the back of the shell 1, that is, the radiator 15 is externalized, the airflow inside the air cooler where the inverter is located can be used to achieve heat dissipation, and there is no need to install a fan inside the inverter, thereby saving costs.

[0043] In addition, since the utility model fixes the mounting seat 16 on the top of the housing 1 and sets mounting holes 17 on both sides of the bottom of the housing 1, two mounting modes are provided for selection, thereby enabling flexible installation of the frequency converter.

[0044] Although this specification is described according to implementation modes, not every implementation mode includes only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.

[0045] Therefore, the above description is only a preferred embodiment of the present application and is not intended to limit the scope of implementation of the present application; that is, all equivalent changes made according to the scope of the claims of the present application are within the protection scope of the claims of the present application.

Claims

1. A frequency converter with waterproof function, comprising a housing with an open front side, a circuit board fixedly mounted on the inner side of the back plate of the housing, and a terminal block fixed on the lower end of the circuit board, characterized in that: An upper cover plate and a lower cover plate are fixedly mounted on the front side of the shell, and a partition plate is integrally connected to the inner side of the lower end of the upper cover plate. The rear edge of the partition plate abuts against the circuit board and is used to separate the terminal block from other electronic components on the circuit board. Through holes are provided at the bottom of the two side plates of the shell, and waterproof connectors are connected in the through holes for sealing and for leading out the wires connected to the terminal block.

2. The frequency converter with waterproof function according to claim 1, characterized in that: Two horizontal bars are integrally connected to the inner walls of both sides of the shell at the upper side near the location of the terminal block, a slot is formed between the two horizontal bars, and the two side edges of the partition are inserted into the slots on both sides from the outside to the inside.

3. The inverter with waterproof function according to claim 1, characterized in that: The rear edge of the partition is integrally connected with a pressure strip, and the rear edge of the pressure strip is fixedly connected with a sealing strip extending along the length direction thereof, and the sealing strip abuts against the circuit board.

4. The frequency converter with waterproof function according to claim 3, characterized in that: A plurality of reinforcing ribs are integrally connected between the pressure strip and the bottom surface of the partition.

5. The inverter with waterproof function according to claim 1, characterized in that: Both sides of the inner side surfaces of the upper cover plate and the lower cover plate are provided with card slots, and the card slots are card-connected to the two side edges of the front side of the shell.

6. The frequency converter with waterproof function according to claim 1, characterized in that: The upper edge of the lower cover plate is integrally connected with a blocking bar, and the blocking bar abuts against the lower edge of the upper cover plate.

7. The frequency converter with waterproof function according to claim 1, characterized in that: A heat dissipation window is arranged on the back plate of the shell, and a radiator covering the heat dissipation window is fixedly installed on the back side of the shell.

8. The inverter with waterproof function according to claim 1, characterized in that: A mounting seat is fixedly mounted on the top end of the shell, and mounting holes are arranged on both sides of the bottom end of the shell.

9. The frequency converter with waterproof function according to claim 1, characterized in that: A plurality of screw holes are provided on both side edges of the front side of the shell, and a plurality of through holes corresponding to the plurality of screw holes are provided on both sides of the upper cover plate and the lower cover plate, and screws pass through the through holes and are screwed into the corresponding screw holes to fix the upper cover plate and the lower cover plate on the front side of the shell respectively.

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