Frequency converter with waterproof structure

Abstract

The utility model relates to the technical field of frequency converters, in particular to a frequency converter with a waterproof structure, which comprises a casing, a partition plate, a circuit board, a radiating fan, a radiator, a guide plate, a cover plate and a drying mechanism. An air outlet and an air inlet which are communicated with the heat dissipation area are formed in the upper end and the lower end of the machine shell respectively, the heat dissipater is fixed to the lower end face of the partition plate and attached to the inversion module, and the flow guide plate is trapezoidal and connected with a drying pipe; the drying cylinder is filled with solid desiccant, a plurality of vent holes are formed in the two ends of the drying cylinder, the drying cylinder slidably penetrates through the sliding hole, the motor is used for driving the lead screw to rotate, and the moving block is in threaded connection with the lead screw and slidably sleeves the optical axis. Therefore, water vapor and dust can be prevented from invading the circuit board, air in the waterproof area can be dried, and the service life of the frequency converter is prolonged.

Description

Technical Field

[0001] The utility model belongs to the technical field of frequency converters and relates to a frequency converter with a waterproof structure. Background Art

[0002] The inverter is an electric power control device that controls the AC motor by changing the frequency of the motor's working power supply. The inverter often faces high-vapor and humid application conditions. In order to ensure the stable operation of the equipment, its waterproof ability is particularly important.

[0003] The inverter module of the frequency converter generates high heat when converting current. In the prior art, the inverter module is generally attached to the heat sink, and the heat on the heat sink is exchanged with the outside air through an independent air duct. The circuit board of the frequency converter is fully enclosed in the shell and isolated from the independent air duct, and multiple sealing strips are set between the shell and the shell cover to achieve the purpose of waterproofing and moisture-proofing. However, the service life of the general sealing strip is about 10-20 years, but after 3-4 years of use, the waterproof sealing effect of the sealing strip decreases year by year due to aging. At the same time, in order to ensure the normal operation of the frequency converter, regular maintenance must be carried out, and some water vapor is easily brought into the shell during the period, which causes the circuit board to be damp and corroded, reducing the service life of the frequency converter. Utility Model Content

[0004] The purpose of the utility model is to solve the above problems in the existing technology and propose a frequency converter with a waterproof structure to solve the problem that water vapor enters the shell, causing the circuit board to be damp and corroded, so as to increase the service life of the frequency converter.

[0005] The purpose of the utility model can be achieved through the following technical solutions: a frequency converter with a waterproof structure, including a casing, a partition, a circuit board, a cooling fan, a radiator, a guide plate, a cover plate and a drying mechanism, the partition has a π-shaped cross-section, the partition is fixed in the casing to divide the inside of the casing into a waterproof area and a cooling area, a mounting port connected to the outside is provided on one side of the waterproof area, a cooling port connecting the waterproof area and the cooling area is provided on the partition, the circuit board is arranged in the waterproof area, an inverter module is coupled to the circuit board, the cooling fan is arranged in the cooling area and is suitable for generating airflow, the upper and lower ends of the casing are respectively provided with an exhaust port and an air inlet connected to the cooling area, the radiator is fixed to the lower end surface of the partition and is attached to the inverter module and seals the cooling port, the back of the radiator has a plurality of cooling fins arranged in parallel and parallel to the airflow direction, the guide plate is trapezoidal, the guide plate is The plate is arranged in the heat dissipation area and fits with the radiator in a concave-convex shape to narrow the air flow path. A drying tube connected to the waterproof area is connected to the plane where the guide plate fits with the radiator. A control panel coupled to the circuit board is embedded in the cover plate. The cover plate is detachably connected to the installation port. The drying mechanism is arranged in the waterproof area. The drying mechanism includes a drying cylinder, a motor, a screw rod, an optical axis and a moving block. The interior of the drying cylinder is filled with solid desiccant and a number of vents connected to the interior are opened at both ends of the drying cylinder. A sliding hole connected to the waterproof area is opened on the outer wall of the casing. The drying cylinder is slidably penetrated on the sliding hole. The motor is electrically connected to the control panel and fixed in the waterproof area to drive the screw rod to rotate. The optical axis is arranged in parallel with the screw rod. The moving block is threadedly connected to the screw rod and slidably sleeved outside the optical axis. One end of the drying cylinder is threadedly matched with the moving block and the other end is provided with an end cover that can be buckled on the outside of the sliding hole to seal the sliding hole.

[0006] Preferably, a one-way solenoid valve is connected to the drying pipe, and a layer of stainless steel filter is fixed on the inlet and outlet of the drying pipe.

[0007] Preferably, a sealing groove is concavely provided inwardly along the edge of the sliding hole on the outer wall of the casing, a first sealing strip is provided in the sealing groove, and the end cover is embedded in the sealing groove and abuts against the first sealing strip.

[0008] Preferably, the edge of the cover plate is bent at 90° to abut against the outer wall of the casing, the edge of the casing mounting port is bent inward to form a sealing end, a second sealing strip in the shape of an annular ring and abutting against the sealing end is fixed to the inner side of the cover plate, the outer wall of the casing adjacent to the sealing end is concave to form an annular guide groove, the upper end face of the casing is inclined toward one side of the guide groove, and the inclination angle is 1%-3%.

[0009] Preferably, a plurality of capacitors are coupled to the circuit board, a plurality of support openings corresponding to the capacitors are opened on the partition, the capacitors are passed through the support openings and extend into the heat dissipation area, a sealing sleeve is fixedly mounted on the root of the capacitor, the sealing sleeve is in contact with the partition and a sealing ring is embedded between the two.

[0010] Preferably, L-shaped heat dissipation side plates parallel to the heat dissipation fins are symmetrically provided on both sides of the back side of the radiator, and a plurality of auxiliary heat dissipation fins are protruded from the inner side of the heat dissipation side plates.

[0011] Preferably, the cooling fan is fixed inside the air outlet.

[0012] Compared with the prior art, the utility model has the following advantages:

[0013] 1. The circuit board in this inverter is fully enclosed and has a multi-layer waterproof structure. It can maintain normal operation for at least 3 minutes under low-pressure water spray and prevent dust from intrusion, meeting the IP55 waterproof grade requirements;

[0014] 2. Using the Venturi principle, the cooling fan dries the moist air that invades the waterproof area while dissipating heat, reducing the difficulty and cost of inverter maintenance and extending the service life of the inverter;

[0015] 3. The cooling fan has both heat dissipation and internal air circulation and drying in the waterproof area, with reasonable structural design and low energy consumption. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of the overall vertical section structure of the utility model.

[0017] Figure 2 yes Figure 1 Schematic diagram of the transverse cross-section structure at the center CC.

[0018] Figure 3 It is a schematic diagram of the drying mechanism structure.

[0019] Figure 4 It is a schematic diagram of the partition structure.

[0020] Figure 5 It is a schematic diagram of the radiator structure.

[0021] Figure 6 yes Figure 1 A schematic diagram of the enlarged structure in the middle.

[0022] Figure 7 yes Figure 1 Enlarged schematic diagram of the structure at point B in the middle.

[0023] In the figure, 1, housing; 11, waterproof area; 111, sliding hole; 12, heat dissipation area; 13, exhaust port; 14, air inlet; 15, sealing groove; 151, first sealing strip; 16, sealing end; 17, guide groove; 2, partition; 21, heat dissipation port; 22, support port; 3, circuit board; 31, inverter module; 32, capacitor; 321, sealing sleeve; 33, sealing ring; 4, cooling fan; 5, radiator; 5 1. Heat sink fins; 52. Heat sink side panels; 53. Auxiliary heat sinks; 6. Guide plates; 61. Drying tubes; 62. One-way solenoid valves; 63. Stainless steel filter screens; 7. Cover plates; 71. Control panels; 72. Second sealing strips; 8. Drying mechanisms; 81. Drying cylinders; 811. Solid desiccant; 812. Vents; 813. End covers; 82. Motors; 83. Screw rods; 84. Optical axes; 85. Moving blocks. DETAILED DESCRIPTION

[0024] The following are specific embodiments of the present invention and the accompanying drawings to further describe the technical solution of the present invention, but the present invention is not limited to these embodiments.

[0025] like Figure 1-Figure 5As shown, a frequency converter with a waterproof structure includes a casing 1, a partition 2, a circuit board 3, a cooling fan 4, a radiator 5, a guide plate 6, a cover plate 7 and a drying mechanism 8. The partition 2 has a π-shaped cross-section. The partition 2 is fixed in the casing 1 to divide the interior of the casing 1 into a waterproof area 11 and a heat dissipation area 12. A mounting port connected to the outside is provided on one side of the waterproof area 11. A heat dissipation port 21 connecting the waterproof area 11 and the heat dissipation area 12 is provided on the partition 2. The circuit board 3 is arranged in the waterproof area 11. 3 is coupled with an inverter module 31, the cooling fan 4 is arranged in the cooling area 12 and is suitable for generating airflow, the upper and lower ends of the housing 1 are respectively provided with an exhaust port 13 and an air inlet 14 connected to the cooling area 12, the radiator 5 is fixed on the lower end surface of the partition 2 and fits with the inverter module 31 and seals the cooling port 21, and the back of the radiator 5 has a plurality of cooling fins 51 arranged in parallel and parallel to the airflow direction, the guide plate 6 is trapezoidal, and the guide plate 6 is arranged in the cooling area 12 and fits with the radiator 5 in a concave-convex shape for The air flow path is reduced, and a drying pipe 61 connected to the waterproof area 11 is connected to the plane where the guide plate 6 and the radiator 5 are attached. A control panel 71 coupled to the circuit board 3 is embedded on the cover plate 7, and the cover plate 7 is detachably fixed to the installation port. The drying mechanism 8 is arranged in the waterproof area 11, and the drying mechanism 8 includes a drying cylinder 81, a motor 82, a screw rod 83, an optical axis 84 and a moving block 85. The interior of the drying cylinder 81 is filled with a solid desiccant 811, and a plurality of passages connected to the interior are opened at both ends of the drying cylinder 81. Air port 812, the outer wall of the casing 1 is provided with a sliding hole 111 connected to the waterproof area 11, the drying cylinder 81 is slidably inserted into the sliding hole 111, the motor 82 is electrically connected to the control panel 71 and fixed in the waterproof area 11 to drive the screw rod 83 to rotate, the optical axis 84 is arranged parallel to the screw rod 83, the moving block 85 is threadedly connected to the screw rod 83 and slidably sleeved outside the optical axis 84, one end of the drying cylinder 81 is threadedly matched with the moving block 85 and the other end is provided with an end cover 813 that can be buckled on the outside of the sliding hole 111 to seal the sliding hole 111.

[0026] In this embodiment, the cooling fan 4 is suitable for generating airflow, and the airflow enters from the air inlet 14 through the heat dissipation area 12 to take out the heat on the radiator 5 from the exhaust port 13, forming an independent heat dissipation air duct. By utilizing the Venturi effect, when the restricted flow passes through the reduced flow cross section, the flow velocity of the fluid increases, and low pressure is generated near the high-speed flowing fluid, thereby generating an adsorption effect. When the airflow generated by the cooling fan 4 passes through the space between the guide plate 6 and the radiator 5, the flow cross section of its flow path is greatly reduced, and the humid gas in the waterproof area 11 is adsorbed through the drying tube 61. During this period, it is necessary to pass The motor 82 is started through the control panel 71. The motor 82 drives the screw rod 83 to rotate and drives the moving block 85 to slide vertically along the optical axis 84, so that the drying cylinder 81 slides along the sliding hole 111 until its outer end passes through the sliding hole 111. The air outside the casing 1 is drawn into the waterproof area 11 through the vent 812. During this period, the internal moisture is removed after the solid desiccant 811 dries it. One end of the drying cylinder 81 is threadedly matched with the moving block 85. When the solid desiccant 811 is saturated, the drying cylinder 81 can be directly replaced or the solid desiccant 811 in the cylinder can be replaced, so as to finally achieve the purpose of drying the gas in the waterproof area 11 and maintaining the air pressure balance.

[0027] Furthermore, if Figure 2 As shown, the drying tube 61 is connected to a one-way electromagnetic valve 62 , which is electrically connected to a control panel 71 , and a layer of stainless steel filter 63 is fixed on the inlet and outlet of the drying tube 61 .

[0028] The stainless steel filter 63 allows moist air to pass through, and the independent air duct absorbs fibers and dust. The stainless steel filter 63 is used to block fibers and dust for easy regular cleaning; the function of the one-way solenoid valve 62 is to form a negative pressure in the waterproof area 11 when an accidental power failure or the motor 82 is started, and large particles of impurities are absorbed into the waterproof area 11 through the drying tube 61 to affect the normal operation of the circuit board 3.

[0029] like Figure 3 As shown, a sealing groove 15 is concavely provided inwardly along the edge of the sliding hole 111 on the outer wall of the housing 1 , a first sealing strip 151 is provided in the sealing groove 15 , and the end cover 813 is embedded in the sealing groove 15 and abuts against the first sealing strip 151 .

[0030] After the waterproof area 11 is air-dried, the end cover 813 is embedded in the sealing groove 15 and abuts against the first sealing strip 151 , thereby ensuring the waterproof sealing of the connection between the sliding hole 111 and the outside of the housing 1 .

[0031] In this embodiment, if Figure 1 and Figure 6As shown, the edge of the cover plate 7 is bent at 90° and abuts against the outer wall of the casing 1. The edge of the mounting port of the casing 1 is bent inward to form a sealing end 16. A second sealing strip 72 in an annular shape and abutting against the sealing end 16 is fixed to the inner side of the cover plate 7. This waterproof sealing structure of the cover plate 7 and the casing 1 is easy to install and can still keep the inverter operating normally when encountering a short-term low-pressure water spray. The outer wall of the casing 1 adjacent to the sealing end 16 is concave to form an annular guide groove 17. The upper end face of the casing 1 is inclined toward one side of the guide groove 17, and the inclination angle is 1%-3%. Water stains on the upper end face of the casing 1 will be guided into the guide groove 17 for rapid discharge and will not invade the seal where the sealing end 16 abuts against the second sealing strip 72.

[0032] In this embodiment, if Figure 1 and Figure 7 As shown, a plurality of capacitors 32 are coupled to the circuit board 3, a plurality of support openings 22 corresponding to the capacitors 32 are opened on the partition 2, the capacitors 32 are passed through the support openings 22 and extend into the heat dissipation area 12, a sealing sleeve 321 is fixedly sleeved at the root of the capacitor 32, the sealing sleeve 321 is in contact with the partition 2 and a sealing ring 33 is embedded between the two.

[0033] Capacitor 32 also needs to dissipate heat when working. Ideally, capacitor 32 does not consume energy and therefore does not generate heat. However, due to the limitation of production process, capacitor 32 actually used is not an ideal capacitor, but is equivalent to an ideal capacitor connected in series with a resistor and an inductor. This means that in actual work, capacitor 32 will consume energy. Although the consumed energy is not large, it will still cause capacitor 32 to generate heat. In addition, capacitor 32 occupies a large volume on circuit board 3. Support opening 22 supports capacitor 32. Capacitor 32 is extended into heat dissipation area 12 to dissipate heat for capacitor 32. A sealing sleeve 321 is fixed at the root of capacitor 32. Sealing sleeve 321 abuts against partition 2 and a sealing ring 33 is embedded between the two. Sealing ring 33 ensures the sealing at support opening 22, and ensures that waterproof area 11 and heat dissipation area 22 are in a completely isolated state.

[0034] The heat dissipation fan 4 is fixed on the inner side of the air outlet 13. By utilizing the principle that hot air rises, fixing the heat dissipation fan 4 on the inner side of the air outlet 13 is more conducive to heat dissipation.

[0035] Furthermore, if Figure 5 As shown, the heat sink 5 has symmetrically disposed L-shaped heat sink side plates 52 parallel to the heat sink fins 51 on both sides of the back side thereof, and a plurality of auxiliary heat sink fins 53 are protruded from the inner side of the heat sink side plates 52 .

[0036] The heat dissipation side plate 52 has a gathering effect on the airflow generated by the heat dissipation fan 4 , and a plurality of auxiliary heat dissipation fins 53 protruding from the inner side surface of the heat dissipation side plate 52 increase the heat dissipation area, thereby effectively improving the heat dissipation efficiency of the radiator 5 .

[0037] The specific embodiments described herein are merely examples of the spirit of the present invention. Those skilled in the art may make various modifications or additions to the specific embodiments described or replace them in similar ways, but they will not deviate from the spirit of the present invention or exceed the scope defined by the appended claims.

Claims

1. A frequency converter with a waterproof structure, characterized in that: The invention comprises a casing (1), a partition (2), a circuit board (3), a cooling fan (4), a radiator (5), a guide plate (6), a cover plate (7) and a drying mechanism (8); the partition (2) has a π-shaped cross section; the partition (2) is fixed in the casing (1) to divide the interior of the casing (1) into a waterproof area (11) and a heat dissipation area (12); a mounting opening connected to the outside is provided on one side of the waterproof area (11); a heat dissipation opening (21) connecting the waterproof area (11) and the heat dissipation area (12) is provided on the partition (2); the circuit board (3) is arranged in the waterproof area (11); and a reverse coupling is provided on the circuit board (3). The inverter module (31) is provided with a heat dissipation fan (4) in a heat dissipation zone (12) and is suitable for generating airflow. The upper and lower ends of the housing (1) are respectively provided with an air outlet (13) and an air inlet (14) connected to the heat dissipation zone (12). The heat sink (5) is fixed on the lower end surface of the partition (2) and is attached to the inverter module (31) and seals the heat dissipation port (21). The back of the heat sink (5) is provided with a plurality of heat dissipation fins (51) arranged in parallel and parallel to the flow direction of the airflow. The guide plate (6) is trapezoidal in shape. The guide plate (6) is provided in the heat dissipation zone (12) and is attached to the heat sink (5) in a concave-convex shape to reduce the airflow. A drying pipe (61) connected to the waterproof area (11) is connected to the plane where the guide plate (6) and the radiator (5) are attached, a control panel (71) coupled to the circuit board (3) is embedded on the cover plate (7), the cover plate (7) is detachably fixed to the installation port, the drying mechanism (8) is arranged in the waterproof area (11), the drying mechanism (8) comprises a drying cylinder (81), a motor (82), a screw rod (83), an optical axis (84) and a moving block (85), the interior of the drying cylinder (81) is filled with a solid desiccant (811), and a plurality of vents (812) connected to the interior are opened at both ends of the drying cylinder (81). ), a sliding hole (111) connected to the waterproof area (11) is opened on the outer wall of the housing (1), a drying cylinder (81) is slidably inserted into the sliding hole (111), a motor (82) is electrically connected to the control panel (71) and fixed in the waterproof area (11) for driving the screw rod (83) to rotate, an optical axis (84) and the screw rod (83) are arranged in parallel, a moving block (85) is threadedly connected to the screw rod (83) and slidably sleeved outside the optical axis (84), one end of the drying cylinder (81) is threadedly matched with the moving block (85) and the other end is provided with an end cover (813) that can be buckled and covered outside the sliding hole (111) to seal the sliding hole (111).

2. The frequency converter with a waterproof structure according to claim 1, characterized in that: The drying tube (61) is connected to a one-way electromagnetic valve (62), which is electrically connected to a control panel (71). A layer of stainless steel filter screen (63) is fixed on the inlet and outlet of the drying tube (61).

3. The frequency converter with a waterproof structure according to claim 1, characterized in that: A sealing groove (15) is provided on the outer wall of the housing (1) along the edge of the sliding hole (111) inwardly, a first sealing strip (151) is provided in the sealing groove (15), and the end cover (813) is embedded in the sealing groove (15) and abuts against the first sealing strip (151).

4. The frequency converter with a waterproof structure according to claim 1, characterized in that: The edge of the cover plate (7) is bent at 90 degrees to abut against the outer wall of the casing (1); the edge of the mounting opening of the casing (1) is bent inward to form a sealing end (16); a second sealing strip (72) in the shape of an annular ring and abutting against the sealing end (16) is fixed to the inner side surface of the cover plate (7); the outer wall of the casing (1) adjacent to the sealing end (16) is concave to form an annular guide groove (17); the upper end surface of the casing (1) is inclined toward one side of the guide groove (17), and the inclination angle is 1%-3%.

5. The frequency converter with a waterproof structure according to claim 1, characterized in that: The circuit board (3) is coupled with a plurality of capacitors (32); the partition (2) is provided with a plurality of support openings (22) corresponding one to one with the capacitors (32); the capacitors (32) are inserted through the support openings (22) and extend into the heat dissipation area (12); a sealing sleeve (321) is fixedly sleeved at the base of the capacitors (32); the sealing sleeve (321) is in contact with the partition (2) and a sealing ring (33) is embedded between the two.

6. The frequency converter with waterproof structure according to claim 1, characterized in that: The heat sink (5) has symmetrically disposed L-shaped heat sink side plates (52) parallel to the heat sink fins (51) on both sides of the back side, and a plurality of auxiliary heat sink fins (53) are protruding from the inner side of the heat sink side plate (52).

7. The frequency converter with a waterproof structure according to claim 1, characterized in that: The heat dissipation fan (4) is fixed inside the air outlet (13).

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