CN111800994B - A high-voltage frequency converter with water-cooling structure and its working method - Google Patents

Abstract

The invention discloses a high-voltage frequency converter with a water-cooling structure and a working method thereof. It includes a housing, a circuit board is symmetrically installed on the inner wall of the housing, and a water-cooling structure is installed inside the housing near the circuit board. The water-cooling structure includes an upper water pipe, a water tank, a refrigeration assembly, a return water tube plate, a heat exchanger, a serpentine water-cooling pipe, an upper water pump, a first connecting pipe and a tee joint, and the serpentine water-cooling pipe is installed inside the shell. And the circuit board is in contact with the serpentine water cooling pipe, the water inlet of the serpentine water cooling pipe is connected with the upper water pump fixed at the bottom of the water tank through the upper water pipe, and the water outlet of the serpentine water cooling pipe is equipped with a three-way joint. The invention has a novel structure and an ingenious concept, which can not only effectively reduce the working temperature of the circuit board, increase the service life of the circuit board, but also return the cooling liquid inside the water tank to return to normal temperature through the heat exchange of the plate heat exchanger, which is convenient for the cooling liquid of reuse.

Description

A high-voltage frequency converter with water-cooling structure and its working method

technical field

The invention relates to the technical field of high-voltage frequency converters, in particular to a high-voltage frequency converter with a water-cooling structure and a working method thereof.

Background technique

The frequency converter is a power control device that uses the on-off function of power semiconductor devices to convert the power frequency power supply to another frequency. With the rapid development of modern power electronics technology and microelectronics technology, high-voltage and high-power frequency conversion speed control devices continue to mature. The high-voltage problem that has been difficult to solve has been well solved in recent years by connecting devices or units in series. High-voltage and high-power frequency conversion speed control devices are widely used in various fans, water pumps, compressors, rolling mills, etc.

The high-voltage inverter will generate a lot of heat during operation. If the heat is not dissipated in time, the high-voltage inverter will work in a high-temperature environment for a long time, which will easily cause the high-voltage inverter to burn out and affect the service life of the high-voltage inverter. Therefore, it is necessary to design a high-voltage frequency converter with a water-cooled structure and its working method.

Contents of the invention

In view of the above situation, in order to overcome the defects of the prior art, the present invention provides a high-voltage frequency converter with a water-cooled structure and its working method. Maintenance, improve the efficiency of inspection and operation and maintenance, and ensure the safety of staff.

In order to achieve the above object, the present invention provides the following technical solutions: a high-voltage frequency converter with a water-cooled structure and its working method, including a housing, the inner wall of the housing is symmetrically mounted with circuit boards, and the inside of the housing is close to The circuit board is installed with a water-cooled structure;

The water-cooling structure includes an upper water pipe, a water tank, a refrigeration assembly, a return pipe, a plate heat exchanger, a serpentine water-cooling pipe, an upper water pump, a first connecting pipe and a tee joint, and the serpentine water-cooling pipe is installed inside the housing , and the circuit board is in contact with the serpentine water-cooling pipe, the water inlet of the serpentine water-cooling pipe is connected with the upper water pump fixed at the bottom of the water tank through the upper water pipe, and the water outlet of the serpentine water-cooling pipe is equipped with a three-way joint. The through joint is connected to the water inlet of the plate heat exchanger through the first connecting pipe. The plate heat exchanger is symmetrically installed on both sides of the outer wall of the shell, and the water outlet of the plate heat exchanger is connected to the top of the water tank through the return pipe. Side connection, one side of the water tank is installed with a refrigeration component.

Preferably, the refrigeration assembly includes a positioning box, a semiconductor refrigerator, a second connecting pipe, a circulation pump, a water inlet pipe, a circulation pipe, and a water outlet nozzle. The positioning box is fixed on one side of the water tank, and the inside of the positioning box is a A circulation pump is installed on the side, and the water inlet of the circulation pump is equipped with a water inlet pipe communicating with the inside of the water tank. The water outlet of the circulation pump is connected to one end of the semiconductor refrigerator through a second connecting pipe, and the other end of the semiconductor refrigerator A circulation pipe communicating with the inside of the water tank is fixed, and a water outlet nozzle is installed on the circulation pipe.

Preferably, a temperature sensor is installed on the top of the water inlet pipe, a PLC controller is installed on one side of the inner wall of the positioning box, the temperature sensor is electrically connected to the input end of the PLC controller, and the output end of the PLC controller is Electrically connect the semiconductor refrigerator and the circulation pump.

Preferably, slide rails are equidistantly installed on the inner wall of the housing, a slide bar is slidably connected to the slide rail, a top end of the slide rail is rotatably connected to a first clamping nut, and one side of the slide bar A positioning seat is installed, and a circuit board is fixed on the positioning seat.

Preferably, rollers are equidistantly installed on the bottom of the slide bar, and the rollers are rollingly connected to the inside of the wheel groove provided inside the slide rail.

Preferably, a heat conduction sheet is fixed on the bottom of the circuit board, and a heat conduction silica gel layer is filled between the heat conduction sheet and the serpentine water-cooling tube.

Preferably, the bottom of the plate heat exchanger is clamped and fixed with a cooling fan.

Preferably, the back of the housing is provided with a chute symmetrically, and a slider is slidably connected to the inside of the chute, and two adjacent sliders are connected through a positioning plate, and a through-hole is screwed on the positioning plate. Pass the second jam nut of the slider.

A working method of a high-voltage frequency converter with a water-cooling structure, the specific operation steps of the device are:

Step 1: The upper water pump works, and the coolant inside the water tank is introduced into the inner circulation of the serpentine water-cooled tube through the upper water pipe, and the heat generated during the operation of the circuit board is transferred to the upper and outer surface of the serpentine water-cooled tube through the heat-conducting sheet and the heat-conducting silicone layer First, heat exchange with the internal coolant, the heat-exchanged coolant enters the interior of the plate heat exchanger through the first connecting pipe for heat exchange, so that the coolant returns to the water tank through the return pipe after cooling;

Step 2: Collect the temperature of the coolant through the temperature sensor on the water inlet pipe, and transmit the collected signal value to the PLC controller. When the value processed by the PLC controller is greater than the preset value of the PLC controller, the PLC The controller controls the work of the refrigeration components;

Step 3: The circulation pump works, the coolant is drawn through the water inlet pipe, and enters the interior of the semiconductor refrigerator through the second connecting pipe to perform refrigeration work, and then the cooled coolant is returned to the inside of the water tank through the circulation pipe, and the circulation pump and The semiconductor refrigerator continues to work until the temperature detected by the temperature sensor is less than or equal to the preset value of the PLC controller.

The beneficial effects of the present invention are:

1. The upper water pump works, and the coolant inside the water tank is introduced into the inner circulation of the serpentine water-cooling tube through the upper water pipe, and the heat generated during the operation of the circuit board is transferred to the upper and outer surfaces of the serpentine water-cooling tube through the heat-conducting sheet and the heat-conducting silicone layer , heat exchange with the internal coolant, the heat-exchanged coolant enters the interior of the plate heat exchanger through the first connecting pipe for heat exchange, so that the coolant returns to the water tank through the return pipe after cooling, which can not only effectively The working temperature of the circuit board is greatly reduced, and the service life of the circuit board is improved, and the coolant returned to the inside of the water tank passes through the heat exchange of the plate heat exchanger, and can return to normal temperature, which is convenient for the reuse of the coolant;

2. The circulation pump works, the temperature sensor of the cooling liquid is collected through the temperature sensor on the water inlet pipe, the cooling liquid is extracted through the water inlet pipe, and enters the interior of the semiconductor refrigerator through the second connecting pipe for refrigeration work, and then through the circulation pipe Return the refrigerated coolant to the inside of the water tank, and the circulating pump and the semiconductor refrigerator continue to work until the temperature detected by the temperature sensor is less than or equal to the preset value of the PLC controller, which is convenient for rapid cooling of the coolant and improves water cooling. Effect;

3. Insert and fix the slide bar on the slide rail, and use the first tightening nut to fix it, and then fix the circuit board on the positioning seat on one side of the slide bar, which is convenient for the rapid installation and disassembly of the circuit board, and facilitates the circuit Board repair and maintenance.

Description of drawings

The accompanying drawings are used to provide a further understanding of the present invention, and constitute a part of the description, and are used together with the embodiments of the present invention to explain the present invention, and do not constitute a limitation to the present invention. In the attached picture:

Fig. 1 is a schematic diagram of the overall three-dimensional structure of the present invention;

Fig. 2 is a schematic diagram of a cross-sectional plane structure inside the housing of the present invention;

Fig. 3 is a schematic diagram of the planar structure of the water cooling structure of the present invention;

Fig. 4 is a schematic diagram of the planar structure of the refrigeration assembly of the present invention;

Fig. 5 is a schematic diagram of the planar structure of the back of the housing of the present invention;

Labels in the figure: 1. shell; 2. upper water pipe; 3. water tank; 4. refrigeration component; 5. return pipe; 6. plate heat exchanger; 7. serpentine water-cooled pipe; 8. slide rail; ; 10, slide bar; 11, the first top tightening nut; 12, positioning seat; 13, circuit board; 14, heat conduction sheet; 15, heat conduction silica gel layer; 19, positioning box; 20, semiconductor refrigerator; 21, second connecting pipe; 22, circulation pump; 23, water inlet pipe; 24, temperature sensor; 25, PLC controller; 26, circulation pipe; 27, water outlet Nozzle; 28, chute; 29, the second clamping nut; 30, slide block; 31, positioning plate.

detailed description

The specific implementation manner of the present invention will be described in further detail below in conjunction with accompanying drawings 1-5.

Given by Figures 1-5, the present invention provides the following technical solutions: a high-voltage frequency converter with a water-cooled structure and its working method, including a housing 1, the inner wall of the housing 1 is symmetrically installed with a circuit board 13, the housing 1 A water-cooling structure is installed near the circuit board 13 inside;

The water cooling structure includes an upper water pipe 2, a water tank 3, a refrigeration assembly 4, a return pipe 5, a plate heat exchanger 6, a serpentine water cooling pipe 7, an upper water pump 16, a first connecting pipe 17 and a tee joint 18, and a serpentine water cooling pipe 7 Installed in the inside of the housing 1, and the circuit board 13 is in contact with the serpentine water cooling tube 7, the water inlet of the serpentine water cooling tube 7 is connected with the upper water pump 16 fixed on the bottom of the water tank 3 through the upper water pipe 2, and the upper water pump 16 of the serpentine water cooling tube 7 The water outlet is equipped with a three-way joint 18, and the three-way joint 18 is connected to the water inlet of the plate heat exchanger 6 through the first connecting pipe 17. The plate heat exchanger 6 is symmetrically installed on both sides of the outer wall of the shell 1, and the plate heat exchanger 6 The water outlet is connected to the top side of the water tank 3 through the return pipe 5, and a cooling assembly 4 is installed on one side of the water tank 3.

The refrigeration assembly 4 comprises a positioning box 19, a semiconductor refrigerator 20, a second connecting pipe 21, a circulating pump 22, a water inlet pipe 23, a circulating pipe 26 and a water outlet nozzle 27. The positioning box 19 is fixed on one side of the water tank 3, and the positioning box 19 A circulating pump 22 is installed on one side of the interior, and the water inlet of the circulating pump 22 is equipped with a water inlet pipe 23 communicating with the inside of the water tank 3. The water outlet of the circulating pump 22 is connected to one end of the semiconductor refrigerator 20 through the second connecting pipe 21, and the semiconductor refrigerator The other end of 20 is fixed with the circulation pipe 26 that communicates with water tank 3 inside, and water outlet nozzle 27 is installed on the circulation pipe 26.

A temperature sensor 24 is installed on the top of the water inlet pipe 23, and a PLC controller 25 is installed on the inner wall of one side of the positioning box 19. The temperature sensor 24 is electrically connected to the input end of the PLC controller 25, and the output end of the PLC controller 25 is electrically connected to the semiconductor Refrigerator 20 and circulation pump 22.

The inner wall of the housing 1 is equidistantly equipped with slide rails 8 , on which slide rails 8 are slidably connected to slide bars 10 , the top end of slide rails 8 is rotatably connected to first jacking nuts 11 , and one side of slide bar 10 is provided with positioning seats. 12. A circuit board 13 is fixed on the positioning seat 12.

The bottom of the slide bar 10 is equidistantly equipped with rollers 9, and the rollers 9 are rollingly connected to the inside of the wheel groove provided in the slide rail 8 to reduce the friction between the slide bar 10 and the rollers 9.

The bottom of the circuit board 13 is fixed with a heat conduction sheet 14, and a heat conduction silica gel layer 15 is filled between the heat conduction sheet 14 and the serpentine water-cooling pipe 7 to facilitate heat transfer.

The bottom of the plate heat exchanger 6 is clamped and fixed with a cooling fan, which is convenient for blowing air on the plate heat exchanger 6 and improving the heat exchange efficiency of the plate heat exchanger 6 .

The back of the housing 1 is provided with a chute 28 symmetrically, and the inside of the chute 28 is slidably connected with a slider 30, and two adjacent sliders 30 are connected by a positioning plate 31, and the locating plate 31 is screwed with a passing slider. The second tightening nut 29 of the block 30, unscrew the second tightening nut 29, so that the slider 30 can move inside the slider 30, so that after the positioning plate 31 is adjusted to a suitable position, the second tightening nut is used. The nut 29 is positioned to facilitate the installation of the frequency converter in different positions and improve the convenience of use.

A working method of a high-voltage frequency converter with a water-cooling structure, the specific operation steps of the device are:

Step 1: The upper water pump 16 works, and the coolant inside the water tank 3 is introduced into the inner circulation of the serpentine water-cooled pipe 7 through the upper water pipe 2, and the heat generated by the circuit board 13 during operation is transferred to the The upper and outer surfaces of the serpentine water-cooled tube 7 exchange heat with the internal cooling liquid, and the heat-exchanged cooling liquid enters the inside of the plate heat exchanger 6 through the first connecting pipe 17 for heat exchange, so that the cooling liquid passes through the Return pipe 5 gets back in the water tank 3 again;

Step 2: Collect the temperature of the cooling liquid by the temperature sensor 24 on the water inlet pipe 23 provided, and transmit the collected signal value to the PLC controller 25, when the numerical value processed by the PLC controller 25 is greater than the preset value of the PLC controller 25 When setting the value, the PLC controller 25 controls the refrigeration assembly 4 to work;

Step 3: The circulation pump 22 works, extracts the coolant through the water inlet pipe 23, and enters the interior of the semiconductor refrigerator 20 through the second connecting pipe 21 to perform refrigeration work, and then returns the refrigerated coolant to the water tank 3 through the circulation pipe 26 Inside, the circulating pump 22 and the semiconductor refrigerator 20 continue to work until the temperature detected by the temperature sensor 24 is less than or equal to the preset value of the PLC controller 25 .

When the present invention is used, the upper water pump 16 works, and the cooling liquid inside the water tank 3 is introduced into the inner circulation of the serpentine water cooling pipe 7 through the upper water pipe 2, and the heat generated during the working process of the circuit board 13 passes through the heat conducting sheet 14 and the heat conducting silica gel layer 15 Transfer to the upper and outer surfaces of the serpentine water-cooled tube 7, and exchange heat with the internal cooling liquid. The heat-exchanged cooling liquid enters the inside of the plate heat exchanger 6 through the first connecting pipe 17 for heat exchange, so that the cooling liquid is cooled. After returning to the water tank 3 through the return pipe 5, not only can effectively reduce the operating temperature of the circuit board 13, improve the service life of the circuit board 13, but also return to the inside of the water tank 3 through the plate heat exchanger 6 heat exchange, It can be returned to normal temperature, which is convenient for the reuse of coolant;

The circulation pump 22 works, and the temperature sensor 24 on the water inlet pipe 23 is used to collect the temperature of the cooling liquid, and the cooling liquid is extracted through the water inlet pipe 23, and enters the inside of the semiconductor refrigerator 20 through the second connecting pipe 21 to perform refrigeration work. Then the coolant after cooling is returned to the inside of the water tank 3 through the circulation pipe 26, and the circulation pump 22 and the semiconductor refrigerator 20 continue to work until the temperature value detected by the temperature sensor 24 is less than or equal to the preset value of the PLC controller 25, which is convenient Realize the rapid cooling of the coolant to improve the water cooling effect;

Insert and fix the slide bar 10 on the slide rail 8, and fix it with the first tightening nut 11, and then fix the circuit board 13 on the positioning seat 12 on one side of the slide bar 10, so as to facilitate the quick installation of the circuit board 13 and disassembly, to facilitate the repair and maintenance of the circuit board 13.

Finally, it should be noted that: the above is only a preferred embodiment of the present invention, and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, for those skilled in the art, it still The technical solutions recorded in the foregoing embodiments may be modified, or some technical features thereof may be equivalently replaced. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included within the protection scope of the present invention.

Claims (8)

1. The utility model provides a high-voltage inverter with water-cooling structure, includes casing (1), its characterized in that: the circuit boards (13) are symmetrically arranged on the inner wall of the shell (1), and a water cooling structure is arranged in the shell (1) close to the circuit boards (13);

the water cooling structure comprises a water feeding pipe (2), a water tank (3), a refrigerating assembly (4), a water return pipe (5), a plate type heat exchanger (6), a snake-shaped water cooling pipe (7), a water feeding pump (16), a first connecting pipe (17) and a three-way joint (18), wherein the snake-shaped water cooling pipe (7) is installed inside the shell (1), a circuit board (13) is in contact with the snake-shaped water cooling pipe (7), a water inlet of the snake-shaped water cooling pipe (7) is connected with the water feeding pump (16) fixed at the bottom of the water tank (3) through the water feeding pipe (2), the three-way joint (18) is installed at a water outlet of the snake-shaped water cooling pipe (7), the three-way joint (18) is connected with a water inlet of the plate type heat exchanger (6) through the first connecting pipe (17), the plate type heat exchanger (6) is symmetrically installed on two sides of the outer wall of the shell (1), a water outlet of the plate type heat exchanger (6) is connected with one side of the top of the water tank (3) through the water return pipe (5), and the refrigerating assembly (4) is installed on one side of the water tank (3);

refrigeration subassembly (4) are including location case (19), semiconductor cooler (20), second connecting pipe (21), circulating pump (22), inlet tube (23), circulating pipe (26) and play water shower nozzle (27), one side in water tank (3) is fixed in location case (19), circulating pump (22) are installed to inside one side of location case (19), inlet tube (23) with water tank (3) inside intercommunication are installed to the water inlet of circulating pump (22), the delivery port of circulating pump (22) is connected with semiconductor cooler (20) one end through second connecting pipe (21), the other end of semiconductor cooler (20) is fixed with circulating pipe (26) with water tank (3) inside intercommunication, install out water shower nozzle (27) on circulating pipe (26).

2. The high-voltage frequency converter with the water cooling structure as claimed in claim 1, wherein: temperature sensor (24) are installed on the top of inlet tube (23), PLC controller (25) are installed to one side inner wall of location case (19), the input of temperature sensor (24) electric connection PLC controller (25), the output electric connection semiconductor cooler (20) and circulating pump (22) of PLC controller (25).

3. The high-voltage frequency converter with the water cooling structure as claimed in claim 1, wherein: slide rail (8) are installed to the inner wall equidistance of casing (1), sliding connection has draw runner (10) on slide rail (8), the top one end of slide rail (8) is rotated and is connected with first tight nut in top (11), positioning seat (12) are installed to one side of draw runner (10), be fixed with circuit board (13) on positioning seat (12).

4. The high-voltage frequency converter with the water cooling structure as claimed in claim 3, wherein: the bottom of the slide bar (10) is equidistantly provided with rollers (9), and the rollers (9) are connected inside wheel grooves formed in the slide rail (8) in a rolling manner.

5. The high-voltage frequency converter with the water cooling structure as claimed in claim 1, wherein: the heat-conducting plate is characterized in that a heat-conducting fin (14) is fixed at the bottom of the circuit board (13), and a heat-conducting silica gel layer (15) is filled between the heat-conducting fin (14) and the snake-shaped water-cooling tube (7).

6. The high-voltage inverter with the water-cooling structure of claim 1, wherein: and a cooling fan is clamped and fixed at the bottom of the plate heat exchanger (6).

7. The high-voltage frequency converter with the water cooling structure as claimed in claim 1, wherein: the back of the shell (1) is symmetrically provided with sliding grooves (28), the sliding grooves (28) are connected with sliding blocks (30) in a sliding mode, two adjacent sliding blocks (30) are connected through positioning plates (31), and second jacking nuts (29) penetrating through the sliding blocks (30) are connected to the positioning plates (31) in a rotating mode.

8. The working method of the high-voltage frequency converter with the water cooling structure is characterized in that: the device comprises the following specific operation steps:

the method comprises the following steps: the water feeding pump (16) works, cooling liquid in the water tank (3) is guided into the inner circulation of the snakelike water-cooling pipe (7) through the water feeding pipe (2), heat generated in the working process of the circuit board (13) is transferred to the upper outer surface of the snakelike water-cooling pipe (7) through the heat conducting fins (14) and the heat conducting silica gel layer (15) to exchange heat with the cooling liquid in the water tank, the cooling liquid after heat exchange enters the plate type heat exchanger (6) through the first connecting pipe (17) to exchange heat, and the cooling liquid is cooled and then returns to the water tank (3) through the water returning pipe (5);

step two: the temperature of cooling liquid is collected through a temperature sensor (24) arranged on a water inlet pipe (23), a collected signal value is transmitted to a PLC (programmable logic controller) (25), and when a numerical value processed by the PLC (25) is larger than a preset value of the PLC (25), the PLC (25) controls a refrigerating assembly (4) to work;

step three: the circulating pump (22) works, the cooling liquid is pumped through the water inlet pipe (23) and enters the inside of the semiconductor refrigerator (20) through the second connecting pipe (21) to perform refrigeration work, the refrigerated cooling liquid is returned to the inside of the water tank (3) through the circulating pipe (26), and the circulating pump (22) and the semiconductor refrigerator (20) continuously work until the temperature value detected by the temperature sensor (24) is smaller than or equal to the preset value of the PLC (25).

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