CN111010850A

CN111010850A - Improved microwave variable frequency power supply heat dissipation structure and power supply

Info

Publication number: CN111010850A
Application number: CN201911263122.9A
Authority: CN
Inventors: 卢高锋; 韩镕蔚
Original assignee: Guangdong Song Research Electronic Technology Co ltd
Current assignee: Guangdong Shangyan Electronic Technology Co.,Ltd.
Priority date: 2019-12-11
Filing date: 2019-12-11
Publication date: 2020-04-14
Anticipated expiration: 2039-12-11
Also published as: CN111010850B

Abstract

The invention relates to an improved microwave variable frequency power supply heat dissipation structure and a power supply, which comprise a shell and a radiator arranged in the shell, and are characterized in that: the shell comprises a cover body and a bottom shell, the cover body and the bottom shell are connected into a whole through a clamping connection structure, and an air guide channel is formed in the inner cavity; the air guide channel is positioned behind the air guide opening and communicated with the air guide opening, and the air flow reaches the air guide channel after passing through the air guide opening; the radiator is connected with a heating element of the microwave variable frequency power supply in a clinging manner to form a direct heat transfer structure, the air guide channel is provided with a plurality of air channel branches, and each air channel branch is respectively communicated with the heating element of the microwave variable frequency power supply in an air mode; the radiator consists of a radiator body, a first radiating tooth and a second radiating tooth, wherein the first radiating tooth and the second radiating tooth are extended out of the radiator body; gaps among the radiating teeth are communicated with air of the air duct branches to form a multi-path radiating structure; the blowing port of the heat radiation fan faces to the heating element of the microwave frequency conversion power panel and is communicated with the air channel branch air to form a multi-channel reinforced heat radiation structure. The ventilation system has the characteristics of high ventilation efficiency, good heat dissipation effect and the like.

Description

Improved microwave variable frequency power supply heat dissipation structure and power supply

Technical Field

The invention relates to an improved microwave variable frequency power supply heat dissipation structure and a power supply. Belongs to the technical field of industrial microwave variable frequency power supplies.

Background

The driving power supply of the magnetron of the traditional microwave equipment usually adopts a circuit structure of a power frequency high-voltage transformer, and has high energy consumption, large volume, heavy weight and unadjustable power; thus limiting the versatility of the microwave device. In recent years, the microwave variable frequency power supply gradually replaces the circuit structure of the traditional power frequency high-voltage transformer due to the advantages of energy conservation, electricity saving, good reliability, wide voltage adaptation, continuous power adjustment and the like.

Because a high-frequency transformer and a semiconductor power element of a microwave variable frequency power supply can generate a large amount of heat in operation, the heat generated by the high-frequency transformer and the semiconductor power element needs to be discharged through a heat dissipation structure, otherwise, the high-frequency transformer and the semiconductor power element can be heated too fast and the temperature is too high. The excessively high temperature lowers the operational reliability of electronic components such as high-frequency transformers and semiconductor power components and shortens the service life thereof. In the prior art, because the overall structure of the microwave variable frequency power supply is unreasonable, the following problems exist: the ventilation and heat dissipation air channel structure in the shell and the inner part is unreasonable, the ventilation efficiency is low, the whole heat dissipation capacity is small, and the heat dissipation effect is poor.

In order to maintain the normal working environment of the electronic components and ensure the service life, the design of the variable frequency power supply shell and the air duct is particularly important.

Disclosure of Invention

One of the purposes of the invention is to solve the problems of unreasonable ventilation and heat dissipation air channel structure, low ventilation efficiency, small overall heat dissipation amount, poor heat dissipation effect and the like of the heat dissipation structure of the conventional microwave variable frequency power supply, and provide an improved heat dissipation structure of the microwave variable frequency power supply, which has the prominent substantive characteristics and remarkable progresses of reasonable ventilation and heat dissipation air channel arrangement, high ventilation efficiency, large overall heat dissipation amount, good heat dissipation effect and the like.

The second purpose of the invention is to solve the problems of unreasonable ventilation and heat dissipation air channels, low ventilation efficiency, small overall heat dissipation amount, poor heat dissipation effect and the like of the existing microwave variable frequency power supply, and provide an improved microwave variable frequency power supply which has the prominent substantive characteristics and obvious progress of reasonable arrangement of the ventilation and heat dissipation air channels, high ventilation efficiency, large overall heat dissipation amount, good heat dissipation effect and the like.

One of the purposes of the invention can be achieved by adopting the following technical scheme:

the utility model provides a modified microwave variable frequency power supply heat radiation structure, includes shell and built-in radiator in the shell, its characterized in that: the shell comprises a cover body and a bottom shell, the cover body is provided with an air guide port, the air guide port is a hot air input port of the microwave variable frequency power supply, and the cover body and the bottom shell are connected into a whole through a clamping connection structure and form an air guide channel in an inner cavity; the air guide channel is positioned behind the air guide opening and communicated with the air guide opening, and the air flow reaches the air guide channel after passing through the air guide opening; the radiator is closely connected with a heating element of the microwave variable frequency power supply to form a direct heat transfer structure, the radiator is positioned in the air guide channel and is completely covered by the air guide channel, the air guide channel is provided with a plurality of air channel branches, and each air channel branch is respectively communicated with the heating element of the microwave variable frequency power supply through air; the radiator consists of a radiator body, a first radiating tooth and a second radiating tooth, wherein the first radiating tooth and the second radiating tooth are extended out of the radiator body; the heat dissipation teeth and the gaps among the heat dissipation teeth are communicated with the air of the air duct branches to form a multi-channel heat dissipation structure; the air guide port is provided with a heat radiation fan, and the air blowing port of the heat radiation fan faces to the heating element of the microwave variable frequency power supply board and is communicated with the branched air of the air duct to form a multi-path reinforced heat radiation structure.

furthermore, the first heat dissipation teeth are positioned on the front surface of the heat sink and are vertical to the heat sink body; the second heat dissipation teeth are positioned on the back surface of the heat radiator and are vertical to the heat radiator body; the thickness of the heat dissipation teeth is equal or designed according to the heat dissipation path, and the thickness of the heat dissipation teeth from the heat radiator body to the tail end of the heat dissipation teeth is gradually reduced from big to small; the thickness of each radiating tooth is 1-2mm, and the surface of each radiating tooth is provided with a corrugated surface, a spherical surface or a rhombic surface; the distance between the two heat dissipation teeth is more than 3mm, and heat is dissipated to the upper surfaces of the first heat dissipation teeth and the second heat dissipation teeth from the radiator body; the bottom surface support column of the radiator is tightly attached to the printed circuit board of the microwave variable frequency power supply and used for supporting the whole radiator.

Furthermore, a first wind guide blade, a second wind guide blade and a third wind guide blade are arranged in the cover body, the first wind guide blade and the second wind guide blade are turned outwards, the turning-outwards angle of the first wind guide blade is 30-90 degrees, the turning-outwards angle of the second wind guide blade is 30-90 degrees, no gap is left between the second wind guide blade and an adjacent heat generating component, so that the area of a wind guide opening is increased, and more air flow is guided into the wind guide opening; the third air guide blade and the side surface of the air guide channel are the same and close to the outer shell side of the microwave oven, and the third air guide blade is not turned outwards and extends by 10-30 mm. The air guide channel is provided with four air channel branches, wherein the four air channel branches comprise a first air channel, a second air channel, a third air channel and a fourth air channel, the length of the cover body is longer than that of the variable frequency power supply board, the air guide channel completely wraps the radiator, or the length of the air guide channel exceeds that of the radiator by 2-10 mm; the thickness of the radiator body is 3-7mm, the second heat dissipation tooth is positioned in the second air channel, the second air guide blade guides air to the second heat dissipation tooth, and the air passes through the second air channel along the second heat dissipation tooth to take away heat on the second heat dissipation tooth; the second heat dissipation teeth are long-strip-shaped, and the surfaces of the second heat dissipation teeth are provided with corrugated surfaces, spherical surfaces, rhombic surfaces or other regular and irregular surfaces so as to enlarge the heat dissipation radiation area and the heat dissipation effect; the radiator is made of aluminum, copper or metal with good heat conducting property.

The second purpose of the invention can be achieved by adopting the following technical scheme:

the utility model provides a microwave variable frequency power supply with improve heat radiation structure, includes heat radiation structure and microwave power supply board, heat radiation structure includes shell and built-in radiator in the shell, its characterized in that: the shell comprises a cover body and a bottom shell, the cover body is provided with an air guide port, the air guide port is a hot air input port of the microwave variable frequency power supply, and the cover body and the bottom shell are connected into a whole through a clamping connection structure and form an air guide channel in an inner cavity; the radiator is closely connected with a heating element of the microwave variable frequency power supply to form a direct heat transfer structure, the radiator is positioned in the air guide channel and is completely covered by the air guide channel, the air guide channel is provided with a plurality of air channel branches, and each air channel branch is respectively communicated with the heating element of the microwave variable frequency power supply through air; the radiator consists of a radiator body, a first radiating tooth and a second radiating tooth, wherein the first radiating tooth and the second radiating tooth are extended out of the radiator body; the heat dissipation teeth and the gaps among the heat dissipation teeth are communicated with the air of the air duct branches to form a multi-channel heat dissipation structure; a blowing port of the cooling fan faces to a heating element of the microwave variable frequency power supply board and is communicated with air of an air duct branch to form a multi-path reinforced cooling structure; the variable frequency power supply board comprises a printed circuit board, and a first diode, a second diode, a transformer, a first capacitor, a second capacitor, a radiator, a first semiconductor element, a second semiconductor element, a cement resistor and an inductor which are arranged in the printed circuit board, wherein the transformer is composed of a transformer framework, a primary winding, a secondary winding, a filament winding and a high-voltage filament wire, the primary winding is connected with a voltage input end of a power supply, and the secondary winding is connected with a voltage output end of the power supply; the air flow flowing through the first air duct and the second air duct of the shell finally flows through the inductor to take away heat on the inductor, the first diode and the second diode are positioned beside the transformer and close to one side of the air guide opening, and the second diode and the primary winding are positioned at the third air duct; the first diode and the secondary winding form a fourth air channel, and the air flows of the third air channel and the fourth air channel are finally equalized to flow through the cement resistor so as to take away the heat on the cement resistor; the cement resistor is provided with two metal pins to enlarge the heat dissipation area of the cement resistor body, and the cement resistor body is 10-20mm away from the printing plate.

furthermore, the first heat dissipation teeth are positioned on the mounting surfaces of the first semiconductor element and the second semiconductor element of the microwave variable frequency power panel, and heat is dissipated to the upper surfaces of the first heat dissipation teeth and the second heat dissipation teeth from the radiator body; the bottom surface support column of the radiator is tightly attached to the printed circuit board of the microwave variable frequency power supply board, is used for supporting the whole radiating fin and is provided with a screw hole, and screws are screwed from the bottom of the printed circuit board to fix the radiator; the cover body is longer than the variable frequency power supply board, the air guide channel completely wraps the radiator to prevent the radiator from contacting with other adjacent devices and prevent high-voltage electricity on the radiator from being conducted to other adjacent devices, or prevent the air guide channel from being too long to cause unsmooth dissipation of radiating airflow and trap heat in the air guide channel; the thickness of the radiator body is 3-7 mm; the first semiconductor component, the second semiconductor component, the first capacitor and the second capacitor of the variable frequency power supply board are positioned in the first air channel, wherein the first capacitor and the second capacitor are arranged in the first air channel side by side or are mutually vertical and arranged in the first air channel in an L shape; the first capacitor and the second capacitor of the variable frequency power supply board are preferably and orderly arranged in the first air channel in a row and are close to the transformer, and spaces are reserved for the first semiconductor component and the second semiconductor component, so that more air volume can take away heat of the first semiconductor component, the second semiconductor component and the first radiating teeth, and the radiating effect of the first semiconductor component and the second semiconductor component can be guaranteed.

Furthermore, an elliptical groove is formed in the transformer framework on the other side of the first air duct, so that heat of the primary winding is dissipated from the elliptical groove and is carried away by air in the first air duct; the heat on the transformer, the first capacitor and the second capacitor is also taken away by the airflow of the first air duct to dissipate heat; the first semiconductor component and the second semiconductor component are locked on the front surface of the radiating fin through screws respectively; the front surface of the radiating fin is of a smooth and flat structure.

Furthermore, the primary winding and the secondary winding are of circular structures, and cold air enters the air guide opening, passes through the second diode to reach the primary winding and flows through the upper part and the lower part of the primary winding; cold air enters the air guide opening and then passes through the first diode to reach the secondary winding; and flows over and under the secondary winding; the distance between the first diode, the second diode, the primary winding and the secondary winding and the printed circuit board is 10-20mm, so that enough space is ensured for flowing more air flow; the first diode and the second diode are respectively arranged in a straight line, and the two straight line structures are mutually parallel or form a certain angle; the first diode and the second diode are high-voltage diodes; the third wind guide blade is not turned outwards, is closer to the fan than the first wind guide blade and the second wind guide blade, can be 2-10mm away from the fan, and can also cross the fan to completely cover airflow; the variable frequency power supply board is provided with a grounding wire and a communication terminal, and the grounding wire is locked on the bottom shell of the microwave oven through a circular ring terminal by a screw so as to achieve a good grounding effect. The communication terminal is used for connecting the microwave oven main control board and carrying out communication control with the main control board; the bent part of the cover body is provided with a reinforcing rib, and a chamfer angle can be added at the bent part to enhance the mechanical strength of the cover body; the first semiconductor element is a bridge rectifier, and the second semiconductor element is an IGBT.

Furthermore, the shell comprises a cover body and a bottom shell, the cover body is provided with an air guide opening, a wire groove, a wire hook, an opening clamping groove and a pressing blade, the air guide opening is a hot air input port of the microwave variable frequency power supply, the wire groove is used for placing a wire, and the wire hook is used for hooking the wire; the bottom shell is provided with a supporting leaf, a boss, a supporting column, a supporting rib, a limiting rib, a high-voltage isolating rib, a supporting leg and a buckling position, wherein the boss of the bottom shell is in fit clamping connection with the opening clamping groove of the cover body to form a clamping connection structure, so that the pressing leaf of the cover body is in fit butt joint with the supporting leaf of the bottom shell; the cover body and the bottom shell are connected into a whole through a clamping type connecting structure, a wind guide channel is formed in the inner cavity, the supporting columns are used for supporting the variable frequency power supply board so as to form a gap wind channel between the variable frequency power supply board and the bottom shell, and a plurality of supporting ribs are arranged on the inner side wall of the bottom shell respectively and used for supporting the edge of the variable frequency power supply board so as to form a side wall gap wind channel; the buckling positions are located above the supporting ribs and are in a trapezoid shape and used for buckling the variable frequency power supply board, the limiting ribs are arranged on the inner wall of the bottom shell and used for limiting the variable frequency power supply board, and the high-voltage isolation ribs are provided with two blocks and arranged on one side of the bottom shell and used for separating the high-voltage power supply of the variable frequency power supply board.

Furthermore, the supporting leaves of the bottom shell comprise a first supporting leaf and a second supporting leaf, the supporting columns of the bottom shell comprise a first supporting column, a second supporting column and a third supporting column, and four supporting legs of the bottom shell comprise first to fourth supporting legs; the cover body is provided with a first pressing hinge and a second pressing hinge, the first pressing hinge and the second pressing hinge are respectively clung to the first supporting hinge of the bottom shell, and the first pressing rib and the second pressing rib of the cover body are matched with the first pressing hinge to embed and clamp the first supporting hinge of the bottom shell); the third pressing rib and the fourth pressing rib of the cover body are matched with the second pressing blade to tightly embed the second supporting blade of the bottom shell; the outer wall of the first supporting leaf of the bottom shell is provided with a first positioning column used for positioning the first pressing leaf of the cover body when the cover body is assembled, and the outer wall of the second supporting leaf of the bottom shell is provided with a second positioning column used for positioning the second pressing leaf of the cover body when the cover body is assembled; the length of the first pressed leaf of the cover body is less than that of the first supporting leaf, and the length of the second pressed leaf of the cover body is less than that of the second supporting leaf; the first supporting column and the second supporting column of the bottom shell are located on opposite corners of the bottom shell and comprise screw holes, the height of the first supporting column and the second supporting column is greater than or equal to 5mm, an isolated supporting structure for the variable frequency power panel is formed, and when the variable frequency power panel is placed on the bottom shell, screws are driven into the first supporting column through the first screw holes in the variable frequency power panel and driven into the second supporting column through the second screw holes; the third supporting column is supported at the high-voltage copper-free position of the variable-frequency power supply board and is provided with a fillet structure so as to avoid stress fracture of the printing board; the supporting ribs of the bottom shell comprise first supporting ribs, second supporting ribs and third supporting ribs, the buckling positions of the bottom shell comprise first buckling positions and second buckling positions, the first buckling positions are located above the first supporting ribs and provided with reinforcing ribs, the second buckling positions are located above the second supporting ribs and provided with reinforcing ribs, the first buckling positions and the second buckling positions are in a right-angle ladder shape, grooves are formed in the positions right below the first buckling positions and the second buckling positions, when the variable-frequency power panel is placed on the bottom shell from the upper side, the variable-frequency power panel slides through a trapezoidal bevel edge, the buckling positions are stressed and deformed to enable the variable-frequency power panel to reach the installation position, and the buckling positions, the first supporting ribs and the second supporting ribs clamp the variable-frequency power panel; the first buckling position and the second buckling position are positioned at the diagonal positions of the bottom shell; the limiting rib of the bottom shell is used for separating a gap between the variable frequency power supply board and the second supporting blade so as to prevent the variable frequency power supply board from being damaged by extrusion when being extruded by external force; rib positions with the same width as the limiting ribs are respectively arranged on the third supporting rib and the second supporting column; the width of the limiting rib is 1-10mm, and the height of the limiting rib is greater than the height of the first support column; the bottom shell is provided with two high-voltage isolation ribs, and after the variable-frequency power supply board is arranged in the shell, the high-voltage isolation ribs respectively penetrate through one high-voltage groove of the high-voltage grooves of the variable-frequency power supply board to separate two pins of the first high-voltage diode and the second high-voltage diode so as to prevent short-circuit ignition caused by the fact that cockroaches stretch across the pins; the height of each of the two high-pressure isolating ribs is 10-30 mm.

Furthermore, connecting ribs are arranged between the four supporting legs on the bottom shell and the other three legs respectively to form four isosceles triangles, and the height of each rib position is 5-30 mm; the bottoms of the first supporting leg, the second supporting leg, the third supporting leg and the fourth supporting leg are respectively provided with a screw hole, and screws are driven into the screw holes to fix the variable frequency power panel; the height of the four supporting legs is determined by the space of the air guide channel and the magnetron, the distance between the air guide channel and the magnetron is more than 10mm, and the height of the four supporting legs is 0-50 mm; the first supporting leg, the second supporting leg, the third supporting leg and the fourth supporting leg are additionally provided with trapezoidal supporting ribs on the basis of the original connecting ribs so as to strengthen the stability of the four supporting legs; the first air guide blade, the second air guide blade outward turning part, the third air guide blade extension part and the bottom shell jointly form an air guide opening; the air guide port is provided with a wire groove for placing a high-voltage lamp silk thread of the variable frequency power supply board, and the wire groove is in an S shape, an L shape or other irregular shapes to form an anti-stretching structure of the high-voltage lamp silk thread; the reinforcing ribs are arranged on the edges of the wire grooves to form a reinforcing structure of the cover body and prevent the shell from being stressed and damaged due to insufficient mechanical strength after grooving; the wire hook is arranged at the top of the air guide channel and used for hooking the tail end of the high-voltage lamp wire to enable the wire hook to be fixed on the cover body; the hook tip of the wire hook inclines inwards slightly, and is cut to half thickness from the outer side inwards, the hook back of the wire hook is provided with a reinforcing rib, and a groove is arranged right below the wire hook.

The invention has the following prominent substantive characteristics and remarkable technical progress:

1. the cover body and the bottom shell are connected into a whole through the clamping connection structure, and an air guide channel is formed in the inner cavity; the air guide channel is positioned behind the air guide opening and communicated with the air guide opening, and the air flow reaches the air guide channel after passing through the air guide opening; the radiator is closely connected with a heating element of the microwave variable frequency power supply to form a direct heat transfer structure, the radiator is positioned in the air guide channel and is completely covered by the air guide channel, the air guide channel is provided with a plurality of air channel branches, and each air channel branch is respectively communicated with the heating element of the microwave variable frequency power supply through air; the radiator consists of a radiator body, a first radiating tooth and a second radiating tooth, wherein the first radiating tooth and the second radiating tooth are extended out of the radiator body; the heat dissipation teeth and the gaps among the heat dissipation teeth are communicated with the air of the air duct branches to form a multi-channel heat dissipation structure; a blowing port of the cooling fan faces to a heating element of the microwave variable frequency power supply board and is communicated with air of an air duct branch to form a multi-path reinforced cooling structure; therefore, the problems that the ventilation and heat dissipation air channel structure of the bottom shell of the existing microwave variable frequency power supply is unreasonable, the ventilation efficiency is low, the overall heat dissipation capacity is small, the heat dissipation effect is poor and the like can be solved, and the microwave variable frequency power supply has the prominent substantive characteristics and the obvious progress that the ventilation and heat dissipation air channel is reasonable in arrangement, the ventilation efficiency is high, the overall heat dissipation capacity is large, the heat dissipation effect is good and the like.

2. The invention relates to a microwave variable frequency power supply, which utilizes a cover body and a bottom shell of a shell to be connected into a whole through a clamping connection structure and forms an air guide channel in an inner cavity, a power element device of a microwave variable frequency power supply board is tightly attached with a radiator, the radiator is positioned in the air guide channel and is completely covered by the air guide channel, the air guide channel is provided with a plurality of air channel branches, each air channel branch is respectively communicated with a heating element of the microwave variable frequency power supply board through air, the end surface of the radiator is provided with radiating teeth, gaps among the radiating teeth are communicated with the air channel branches through air, a multi-channel radiating passage is formed in the microwave variable frequency power supply, all the heating elements in the variable frequency power supply board are covered in a hot air channel, all the heating elements in the variable frequency power supply board are reasonably arranged, and air flow passing through a first air channel and a second air channel of, the first diode and the second diode are positioned beside the transformer and close to one side of the air guide port, and the second diode and the primary winding are positioned at the third air duct; the first diode and the secondary winding form a fourth air channel, and the air flows of the third air channel and the fourth air channel are finally equalized to flow through the cement resistor so as to take away the heat on the cement resistor; the cement resistor is provided with two metal pins to increase the heat dissipation area of the cement resistor body, which is equivalent to increase the whole heat dissipation area, so that the problems of unreasonable structure, low ventilation efficiency, small whole heat dissipation amount, poor heat dissipation effect and the like of a ventilation and heat dissipation air channel of a bottom shell of the conventional microwave variable frequency power supply can be solved, and the cement resistor has prominent substantive characteristics and remarkable progress of reasonable arrangement, high ventilation efficiency, large whole heat dissipation amount, good heat dissipation effect and the like of the ventilation and heat dissipation air channel.

Drawings

Fig. 1 is an exploded schematic view of an embodiment of a microwave variable frequency power supply of the present invention.

Fig. 2 is a structural side view of an embodiment of the cover of the present invention.

Fig. 3 is a partial structural schematic view of an embodiment of the cover of the present invention.

Fig. 4 is a top view of the bottom case according to the embodiment of the present invention.

Fig. 5 is a structural bottom view of the bottom case according to the embodiment of the present invention.

Fig. 6 is a schematic perspective view of a bottom case according to an embodiment of the invention.

Fig. 7 is a second schematic perspective view of the bottom case according to the embodiment of the invention.

Fig. 8 is an external structural view of a heat dissipation structure according to an embodiment of the present invention.

Fig. 9 is a partial structural schematic view of a heat dissipation structure according to an embodiment of the invention.

Fig. 10 is a schematic structural diagram of a heat sink of the heat dissipation structure according to the embodiment of the invention.

Fig. 11 is a structural bottom view of a heat sink of the heat dissipation structure according to the embodiment of the present invention.

Fig. 12 is a top view of the structure of the variable frequency power supply board according to the embodiment of the invention.

Fig. 13 is a structural side view of the variable frequency power supply board according to the embodiment of the invention.

Fig. 14 is a schematic perspective view of a variable frequency power supply board according to an embodiment of the invention.

Fig. 15 is a schematic view of a usage state structure of the variable frequency power supply according to the embodiment of the invention.

Fig. 16 is a second schematic structural diagram of the variable frequency power supply according to the embodiment of the invention.

Detailed Description

The invention is further described with reference to the following figures and examples.

Specific example 1:

referring to fig. 1 to 11, the improved heat dissipation structure for a microwave variable frequency power supply according to embodiment 1 includes a housing and a heat sink 5 built in the housing, where the housing includes a lid 1 and a bottom case 2, the lid 1 is provided with an air guiding opening 1-1, the air guiding opening 1-1 is a hot air input port of the microwave variable frequency power supply, and the lid 1 and the bottom case 2 are connected into a whole through a clamping connection structure and form an air guiding duct 1-2 in an inner cavity; the air guide channel 1-2 is positioned behind the air guide opening 1-1 and communicated with the air guide opening 1-1, and airflow reaches the air guide channel 1-2 after passing through the air guide opening 1-1; the radiator 5 is connected with a heating element of the microwave variable frequency power supply in a clinging manner to form a direct heat transfer structure, the radiator 5 is positioned in the air guide channel 1-2 and is completely covered by the air guide channel 1-2, the air guide channel 1-2 is provided with a plurality of air channel branches, and each air channel branch is respectively communicated with the heating element of the microwave variable frequency power supply through air; the radiator 5 consists of a radiator body 5-1, and a first radiating tooth 5-2 and a second radiating tooth 5-3 which extend out of the radiator body; the heat dissipation teeth and the gaps among the heat dissipation teeth are communicated with the air of the air duct branches to form a multi-channel heat dissipation structure; a heat radiation fan 3-13 is arranged at the air guide port 1-1, and an air blowing port of the heat radiation fan 3-13 faces to a heating element of the microwave frequency conversion power supply board 3 and is communicated with air channel branch air to form a multi-channel reinforced heat radiation structure.

In this embodiment:

the first heat dissipation teeth 5-2 are positioned on the front surface 5-4 of the heat sink and are vertical to the heat sink body 5-1; the second heat dissipation teeth 5-3 are positioned on the back of the heat sink 5 and are vertical to the heat sink body 5-1; the thickness of the heat dissipation teeth is equal or designed according to the heat dissipation path, and the thickness of the heat dissipation teeth from the radiator body 5-1 to the tail end of the heat dissipation teeth is gradually reduced from big to small; the thickness of each radiating tooth is 1-2mm, and the surface of each radiating tooth is provided with a corrugated surface, a spherical surface or a rhombic surface; the distance between the two heat dissipation teeth is more than 3mm, and heat is dissipated from the radiator body 5-1 to the upper surfaces of the first heat dissipation teeth 5-2 and the second heat dissipation teeth 5-3; the bottom surface support columns 5-5 of the radiator 5 are tightly attached to the printed circuit board of the microwave variable frequency power supply and used for supporting the whole radiator 5.

The cover body 1 is internally provided with a first wind guide blade 1-8, a second wind guide blade 1-9 and a third wind guide blade 1-10, the first wind guide blade 1-8 and the second wind guide blade 1-9 are turned outwards, the turning-outwards angle of the first wind guide blade 1-8 is 30-90 degrees, the turning-outwards angle of the second wind guide blade 1-9 is 30-90 degrees, no gap is left between the second wind guide blade 1-9 and an adjacent heat generating component, so that the area of the wind guide port 1-1 is increased, and more airflow is guided into the wind guide port 1-1; the third wind guide blade 1-10 and the side surface of the wind guide channel 1-2 are the same surface and close to the outer shell side of the microwave oven, and the third wind guide blade is not turned outwards and extends for 10-30 mm. The air guide duct 1-2 is provided with four air duct branches, and comprises a first air duct 1-2-1, a second air duct 1-2-2, a third air duct 1-2-3 and a fourth air duct 1-2-4, the length of the cover body 1 is longer than that of the variable frequency power supply board 3, the air guide duct 1-2 completely covers the radiator 5, or the length of the air guide duct 1-2 exceeds that of the radiator 5 by 2-10 mm; the thickness of the radiator body 5-1 is 3-7mm, the second heat dissipation tooth 5-3 is positioned in the second air channel 1-2-2, the second air guide blade 1-9 guides air to the second heat dissipation tooth 5-3, and the heat on the second heat dissipation tooth 5-3 is taken away through the second air channel 1-2-2 along the second heat dissipation tooth 5-3; the second heat dissipation teeth 5-3 are strip-shaped, and the surfaces of the second heat dissipation teeth are provided with corrugated surfaces, spherical surfaces, rhombic surfaces or other regular and irregular surfaces so as to enlarge the heat dissipation radiation area and the heat dissipation effect; the heat sink 5 is made of aluminum, copper, or metal having good heat conductivity.

The thickness of the radiator body 5-1 is 3-7mm, or is determined by the power of the variable frequency power supply board 3 and the heat productivity of the first semiconductor element 3-6 and the second semiconductor element 3-7.

The radiator body 5-1 is preferably made of aluminum, the aluminum quality is light, the heat radiation performance is good, the price is low, the ductility is good, the production difficulty is low, and the required appearance is easy to manufacture through integrated extrusion.

Referring to fig. 1 to 16, the microwave variable frequency power supply with an improved heat dissipation structure according to embodiment 1 includes a heat dissipation structure and a microwave power supply board 3, where the heat dissipation structure includes a housing and a heat sink 5 embedded in the housing, the housing includes a cover 1 and a bottom case 2, the cover 1 is provided with an air guide opening 1-1, the air guide opening 1-1 is a hot air input port of the microwave variable frequency power supply, and the cover 1 and the bottom case 2 are connected into a whole through a clamping connection structure and form an air guide duct 1-2 in an inner cavity; the radiator 5 is connected with a heating element of the microwave variable frequency power supply in a clinging manner to form a direct heat transfer structure, the radiator 5 is positioned in the air guide channel 1-2 and is completely covered by the air guide channel 1-2, the air guide channel 1-2 is provided with a plurality of air channel branches, and each air channel branch is respectively communicated with the heating element of the microwave variable frequency power supply through air; the radiator 5 consists of a radiator body 5-1, and a first radiating tooth 5-2 and a second radiating tooth 5-3 which extend out of the radiator body; the heat dissipation teeth and the gaps among the heat dissipation teeth are communicated with the air of the air duct branches to form a multi-channel heat dissipation structure; a heat radiation fan 3-13 is arranged at the air guide port 1-1, and an air blowing port of the heat radiation fan 3-13 faces to a heating element of the microwave frequency conversion power supply board 3 and is communicated with air channel branch air to form a multi-channel reinforced heat radiation structure; the variable frequency power supply board 3 comprises a printed circuit board 3-8, and a first diode 3-1, a second diode 3-2, a transformer 3-3, a first capacitor 3-4, a second capacitor 3-5, a radiator 5, a first semiconductor element 3-6, a second semiconductor element 3-7, a cement resistor 3-11 and an inductor 3-12 which are arranged in the printed circuit board 3-8, the transformer 3-3 is composed of a transformer framework 3-3-1, a primary winding 3-3-2, a secondary winding 3-3-3, a filament winding 3-3-4 and a high-voltage lamp wire 4, wherein the primary winding 3-3-2 is connected with a voltage input end of a power supply, and the secondary winding 3-3-3 is connected with a voltage output end of the power supply; the air flow passing through the first air duct 1-2-1 and the second air duct 1-2-2 of the shell finally passes through the inductor 3-9 to take away heat on the inductor 3-9, the first diode 3-1 and the second diode 3-2 are positioned beside the transformer and close to one side of the air guide opening 1-1, and the second diode 3-2 and the primary winding 3-3-2 are positioned at the third air duct 1-2-3; the first diode 3-1 and the secondary winding 3-3-3 form a fourth air duct 1-2-4, and the air flows of the third air duct 1-2-3 and the fourth air duct 1-2-4 flow through the cement resistor 3-11 to take away the heat on the cement resistor 3-11; the cement resistor 3-11 is provided with two metal pins to enlarge the heat dissipation area of the cement resistor 3-11 body, and the distance between the cement resistor 3-11 body and the printing plate 3-8 is 10-20 mm; the microwave variable frequency power supply with the improved heat dissipation structure is formed.

In this embodiment:

the first heat dissipation teeth 5-2 are positioned on the mounting surfaces of the first semiconductor element 3-6 and the second semiconductor element 3-7 of the microwave variable frequency power panel 3, and heat is dissipated from the radiator body 5-1 to the upper surfaces of the first heat dissipation teeth 5-2 and the second heat dissipation teeth 5-3; a bottom surface support column 5-5 of the radiator 5 is tightly attached to a printed circuit board 3-8 of the microwave variable frequency power supply board 3 and used for supporting the whole radiating fin, and is provided with screw holes 5-6, and screws are screwed from the bottom of the printed circuit board 3-8 to fix the radiator 5; the length of the cover body 1 is longer than that of the variable frequency power supply board 3, the air guide channel 1-2 completely wraps the radiator 5 so as to prevent the radiator 5 from contacting with other adjacent devices and prevent high-voltage electricity on the radiator 5 from being conducted to other adjacent devices, or prevent the air guide channel 1-2 from being too long, so that radiating airflow is not smoothly dissipated, and heat is trapped in the air guide channel 1-2; the thickness of the radiator body 5-1 is 3-7 mm; the first semiconductor component 3-6, the second semiconductor component 3-7, the first capacitor 3-4 and the second capacitor 3-5 of the variable frequency power panel 3 are positioned in the first air duct 1-2-1, wherein the first capacitor 3-4 and the second capacitor 3-5 are arranged in the first air duct 1-2-1 side by side or are mutually vertically arranged in the first air duct 1-2-1 in an L shape; the first capacitor 3-4 and the second capacitor 3-5 of the variable frequency power supply board 3 are preferably arranged in order in a row in the first air duct 1-2-1 and close to the transformer 3-3, and a space is reserved for the first semiconductor component 3-6 and the second semiconductor component 3-7, so that more air can take away heat of the first semiconductor component 3-6, the second semiconductor component 3-7 and the first heat dissipation tooth 5-2, and the heat dissipation effect of the first semiconductor component 3-6 and the second semiconductor component 3-7 is ensured.

On the other side of the first air duct 1-2-1, the transformer framework 3-3-1 is provided with an elliptical groove so that the heat of the primary winding 3-3-2 is dissipated from the elliptical groove and is carried away by the air of the first air duct 1-2-1 to dissipate heat; the heat on the transformer 3-3, the first capacitor 3-4 and the second capacitor 3-5 is also taken away by the airflow of the first air duct 1-2-1 to dissipate heat; the first semiconductor component 3-6 and the second semiconductor component 3-7 are locked on the front surface 5-4 of the heat sink through screws respectively; the front surface 5-4 of the radiating fin is of a smooth and flat structure.

The primary winding 3-3-2 and the secondary winding 3-3-3 are circular structures, and cold air enters the air guide opening 1-1, passes through the second diode 3-2 to the primary winding 3-3-2 and flows through the upper part and the lower part of the primary winding 3-3-2; cold air enters the air guide opening 1-1 and then passes through the first diode 3-1 to the secondary winding 3-3-3; and flows over and under the secondary winding 3-3-3; the distance between the first diode 3-1, the second diode 3-2, the primary winding 3-3-2, the secondary winding 3-3-3 and the printed circuit board 3-8 is 10-20mm, so that enough space is ensured for flowing more air flow; the first diode 3-1 and the second diode 3-2 are respectively arranged in a straight line, and the two straight line structures are mutually parallel or form a certain angle; the first diode 3-1 and the second diode 3-2 are high-voltage diodes; the third guide vanes 1-10 are not turned outwards, and the positions of the third guide vanes relative to the fan 3-13 are closer than the first guide vanes 1-8 and the second guide vanes 1-9, so that the third guide vanes can be 2-10mm away from the fan 3-13 and can also cross the fan 3-13 to completely cover airflow; the variable frequency power supply board 3 is provided with a grounding wire 3-10 and a communication terminal 3-12, and the grounding wire is locked on the microwave oven bottom shell 7 through a circular ring terminal by a screw so as to achieve a good grounding effect. The communication terminals 3-12 are used for connecting a microwave oven main control board and carrying out communication control with the main control board; reinforcing ribs 1-15 are arranged at the bending position of the cover body 1, and chamfers 1-16 can be added at the bending position to enhance the mechanical strength of the cover body; the first semiconductor element 3-6 is a bridge rectifier and the second semiconductor element 3-7 is an IGBT.

Referring to fig. 1-7, the housing includes a cover 1 and a bottom case 2, the cover 1 is provided with an air guide port 1-1, a wire groove 1-3, a wire hook 1-4, an opening slot 1-5 and a press-fit leaf, the air guide port 1-1 is a hot air input port of a microwave variable frequency power supply, the wire groove 1-3 is used for placing a wire, and the wire hook 1-4 is used for hooking the wire; the bottom shell 2 is provided with a supporting leaf 2-1, a boss 2-2, a supporting column 2-3, a supporting rib 2-4, a limiting rib 2-5, a high-pressure isolating rib 2-6, a supporting leg 2-7 and a buckling position 2-11, wherein the boss 2-2 of the bottom shell is matched and clamped with an opening clamping groove 1-5 of the cover body to form a clamping type connecting structure, so that the pressing hinge of the cover body 1 is matched and butted with the supporting leaf 2-1 of the bottom shell; the cover body 1 and the bottom shell 2 are connected into a whole through a clamping type connecting structure, an air guide duct 1-2 is formed in the inner cavity, the support columns 2-3 are used for supporting the variable frequency power supply board 3 to form a gap air duct between the variable frequency power supply board 3 and the bottom shell 2, and a plurality of support ribs 2-4 are arranged on the inner side wall of the bottom shell 2 respectively and used for supporting the edge of the variable frequency power supply board 3 to form a side wall gap air duct; the buckling positions 2-11 are positioned above the supporting ribs 2-4 and are in a ladder shape and used for buckling the variable frequency power supply board 3, the limiting ribs 2-5 are arranged on the inner wall of the bottom shell 2 and used for limiting the variable frequency power supply board 3, and the high-voltage isolating ribs 2-6 are provided with two blocks and arranged on one side of the bottom shell and used for isolating a high-voltage power supply of the variable frequency power supply board 3.

The supporting blade 2-1 of the bottom shell 2 comprises a first supporting blade and a second supporting blade, the supporting column 2-3 of the bottom shell 2 comprises a first supporting column, a second supporting column and a third supporting column, and four supporting legs 2-7 of the bottom shell 2 comprise first to fourth supporting legs; the cover body 1 is provided with a first pressing hinge 1-6 and a second pressing hinge 1-7, the first pressing hinge 1-6 and the second pressing hinge 1-7 are respectively tightly attached to a first supporting leaf 2-1 of the bottom shell 2, and a first pressing rib 1-11 and a second pressing rib 1-12 of the cover body are matched with the first pressing hinge 1-6 to tightly embed and clamp the first supporting leaf 2-1 of the bottom shell 2; the third pressing rib 1-13 and the fourth pressing rib 1-14 of the cover body are matched with the second pressing hinge (1-7) to tightly embed and clamp the second supporting leaf 2-1 of the bottom shell; the outer wall of the first supporting leaf 2-1 of the bottom shell 2 is provided with a first positioning column 2-11 for positioning the first pressing hinge 1-6 of the cover body when the cover body 1 is assembled, and the outer wall of the second supporting leaf 2-1 of the bottom shell 2 is provided with a second positioning column 2-11 for positioning the second pressing hinge 1-7 of the cover body when the cover body 1 is assembled; the length of the first pressing hinge 1-6 of the cover body is less than that of the first supporting hinge 2-1, and the length of the second pressing hinge 1-7 of the cover body is less than that of the second supporting hinge 2-1; the first supporting column and the second supporting column of the bottom shell 2 are positioned on diagonal positions of the bottom shell 2 and comprise screw holes, the height of the screw holes is larger than or equal to 5mm, a separated supporting structure for the variable frequency power supply board 3 is formed, when the variable frequency power supply board 3 is placed on the bottom shell 2, screws are driven into the first supporting column 2-3 through the first screw holes on the variable frequency power supply board 3, and screws are driven into the second supporting column 2-3 through the second screw holes; the third support column 2-3 is supported at the high-voltage copper-free position of the variable-frequency power supply board 3 and is provided with a fillet structure so as to avoid stress fracture of the printing board; the supporting ribs 2-4 of the bottom shell comprise first supporting ribs, second supporting ribs and third supporting ribs, the buckling positions 2-11 of the bottom shell comprise first buckling positions and second buckling positions, the first buckling positions are located above the first supporting ribs and provided with reinforcing ribs, the second buckling positions are located above the second supporting ribs and provided with reinforcing ribs, the first buckling positions and the second buckling positions are in a right-angled ladder shape, grooves are formed in the positions right below the first buckling positions and the second buckling positions, when the variable-frequency power panel 3 is placed on the bottom shell 2 from the upper side, the variable-frequency power panel 3 slides through a trapezoidal bevel edge, the buckling positions 2-11 deform under stress to enable the variable-frequency power panel 3 to reach an installation position, and the buckling positions 2-11, the first supporting ribs and the second supporting ribs clamp the variable-frequency power panel 3; the first buckling position and the second buckling position are positioned at the diagonal positions of the bottom shell; the limiting ribs 2-5 of the bottom shell 2 are used for separating a gap between the variable frequency power supply board 3 and the second supporting blade so as to prevent the variable frequency power supply board 3 from being damaged by extrusion when being extruded by external force; rib positions with the width being the same as that of the limiting ribs 2-5 are respectively arranged on the third supporting rib and the second supporting column; the width of the limiting rib 2-5 is 1-10mm, and the height is larger than the height of the first support column; the bottom shell 2 is provided with two high-voltage isolation ribs, and after the variable-frequency power supply board 3 is arranged in the shell, the high-voltage isolation ribs respectively penetrate through one high-voltage groove of the high-voltage grooves of the variable-frequency power supply board to separate two pins of the first high-voltage diode and the second high-voltage diode so as to prevent a cockroach from crossing the pins to cause short-circuit ignition; the height of each of the two high-pressure isolating ribs is 10-30 mm.

Connecting ribs 2-9 are arranged between the four supporting legs on the bottom shell 2 and the other three legs respectively to form four isosceles triangles, and the height of each rib position is 5-30 mm; the bottoms of the first supporting leg, the second supporting leg, the third supporting leg and the fourth supporting leg are respectively provided with a screw hole 2-7-1, and a variable frequency power supply board 3 is fixed by driving a screw into the screw hole 2-7-1; the heights of the four supporting legs are determined by the spaces of the air guide duct and the magnetron, the distance between the air guide duct 1-2 and the magnetron is more than 10mm, and the heights of the four supporting legs are 0-50 mm; the first supporting leg, the second supporting leg, the third supporting leg and the fourth supporting leg are additionally provided with trapezoidal supporting ribs on the basis of the original connecting ribs so as to strengthen the stability of the four supporting legs; the first air guide blade 1-8, the outward turning part of the second air guide blade 1-9, the extension part of the third air guide blade 1-10 and the bottom shell 2 jointly form an air guide opening 1-1; the air guide port 1-1 is provided with a wire groove 1-3 for placing a high-voltage lamp wire 4 of the variable frequency power supply board 3, and the wire groove 1-3 is in an S shape, an L shape or other irregular shapes to form an anti-stretching structure of the high-voltage lamp wire 4; reinforcing ribs are arranged on the edges of the wire grooves 1-3 to form a reinforcing structure of the cover body 1 and prevent the shell from being stressed and damaged due to insufficient mechanical strength after grooving; the wire hook 1-4 is arranged at the top of the air guide channel 1-2 and used for hooking the tail end of the high-voltage lamp wire 4 so as to fix the high-voltage lamp wire on the cover body 1; the hook tip of the wire hook 1-4 is slightly inclined inwards, and a half of the thickness is cut from the outer side to the inner side, the hook back of the wire hook 1-4 is provided with a reinforcing rib, and a groove is arranged right below the hook.

The first diode 3-1 and the second diode 3-2 are respectively arranged in a straight line, and the two straight line structures are mutually parallel or form a certain angle; the first diode 3-1 and the second diode 3-2 are high voltage diodes.

The third guide vanes 1-10 are not turned outwards, and the positions relative to the fans 3-13 are closer than the first guide vanes 1-8 and the second guide vanes 1-9, so that the third guide vanes can be 2-10mm away from the fans 3-13, and can also pass over the fans 3-13 to completely cover airflow. Not only can save the space of the whole machine, but also can prevent more air flows from escaping.

The variable frequency power supply board 3 is provided with a grounding wire 3-10 and a communication terminal 3-12, and the grounding wire is locked on the microwave oven bottom shell 7 through a circular ring terminal by a screw so as to achieve a good grounding effect. The communication terminals 3-12 are used for connecting the microwave oven main control board and performing communication control with the main control board.

Reinforcing ribs 1-15 are arranged at the bending position of the cover body 1, and chamfers 1-16 can be added at the bending position to enhance the mechanical strength of the cover body; the first semiconductor element 3-6 is a bridge rectifier and the second semiconductor element 3-7 is an IGBT.

In practical application, when the variable frequency power supply is used in the microwave oven 10, the bottom shell 2 is fixed on the bottom shell 7 of the microwave oven by screws, so that the microwave variable frequency power supply is integrally fixed on the microwave oven, the microwave variable frequency power supply is positioned below a magnetron structure, a heat radiation fan 3-13 is arranged at an air inlet of a shell of the variable frequency power supply, and a ground wire end 3-10 and a communication terminal 3-12 are arranged in a microwave variable frequency power supply board. The wind-guiding opening 1-1 of the microwave frequency conversion power supply is butted with the wind-opening end of the magnetron structure, the microwave frequency conversion power supply and the roller control pipe structure are respectively provided with a wind outlet (or a wind inlet), and air flow type convection wind is formed on the microwave frequency conversion power supply and the roller control pipe structure through the fan driving of a cooling fan 3-13, so that a strong wind power cooling structure is formed; the primary winding 3-3-2 is used as a voltage input end of a power supply and inputs alternating voltage, and the secondary winding 3-3-3 is used as a voltage output end of the power supply and is connected with a voltage input end of a magnetron structure so as to drive a magnetron to work.

The shell has good air guiding effect, and the variable frequency power supply board arranged in the shell has good heat dissipation effect. The housing includes: the cover body is positioned at the top of the bottom shell. The cover body comprises an air guide opening, an air guide channel, an S-shaped wire guide groove, a wire hook, an opening clamping groove and an installation rib. The drain pan includes drain pan support column, drain pan strengthening rib, the spacing muscle of frequency conversion, frequency conversion support column, high pressure separate and insulate muscle, screw post. Because the drain pan has high pressure to keep apart the muscle position, separates adjacent high-pressure region, has avoided having foreign matter such as cockroach to span between the high-pressure region and has struck sparks, reinforcing security performance.

The supporting legs of the bottom shell related by the invention can be square, each supporting leg is connected with the other three supporting legs to form four isosceles triangles, and the trapezoidal supporting ribs are added on the basis of the connected ribs, so that the mechanical strength of the bottom shell and the supporting legs is greatly enhanced. The second guide vane is provided with an S-shaped, an L-shaped or other irregular guide groove, the guide groove is provided with a guide wire hook, and the filament wire is not easy to fall off and is fixed reliably through the guide groove and the guide wire hook.

The grooves are formed below the shell hook and the buckling position, so that the stress deformation difficulty is reduced, and the reinforcing ribs are added, so that the toughness and the strength of the hook and the buckling position are improved. The first air guide blade and the second air guide blade of the shell are folded outwards, the air guide opening space is reasonably utilized, the air guide area is large, and the air guide flow is large.

The positions of the shell supporting the variable frequency power supply board are uniformly distributed, and the shell supporting the variable frequency power supply board can be fully buffered when being extruded by external force, so that the variable frequency power supply board is not damaged; the third wind guide blade is not turned outwards, is closer to the fan than the first wind guide blade and the second wind guide blade, can be 2-10mm away from the fan, and can also cross the fan to completely cover the airflow. Not only can save the space of the whole machine, but also can prevent more air flows from escaping. The bottom shell is provided with the positioning column, and the positioning column can be used for positioning and mounting easily when the cover body is assembled.

The heat dissipation teeth of the heat radiator are perpendicular to the heat radiator body, and the thickness of the heat dissipation teeth from the heat radiator body to the tail end of the heat dissipation teeth is gradually reduced, so that materials and cost can be saved. The surfaces of the radiating teeth are provided with corrugated surfaces, spherical surfaces, diamond surfaces and other regular or irregular surfaces, so that the heat radiation area is enlarged, and the radiating effect is enhanced.

The first capacitor and the second capacitor are arranged in a row in order and are far away from the semiconductor component as far as possible, enough space is reserved for the semiconductor component, more air flow can directly flow through the semiconductor component to take away heat, and the heat dissipation effect is good. The first diode, the second diode, the primary winding and the secondary winding are 10-20mm away from the printed board, so that heat is taken away by airflow to dissipate heat. And the air flows of the third air duct and the fourth air duct flow through the cement resistor at last and take away the heat on the cement resistor. The cement resistor is provided with two metal pins, the metal pins are good in heat conducting performance, the heat dissipation area of the cement resistor body is enlarged, and heat dissipation is facilitated.

The microwave variable frequency power supply provided by the invention has the advantages that the first air guide blade and the second air guide blade of the shell are folded outwards, the space of the air guide opening is reasonably utilized, the air guide area is large, and the air guide flow is large. The third wind guide blade is not turned outwards, is closer to the fan than the first wind guide blade and the second wind guide blade, can be 2-10mm away from the fan, and can also cross the fan to completely cover the airflow. Not only can save the space of the whole machine, but also can prevent more air flows from escaping. The shell of the invention has simple structure, convenient production and easy assembly. The positions of the shell supporting the variable frequency power supply board are uniformly distributed, and the shell can be fully buffered when being extruded by external force, so that the variable frequency power supply board is not damaged. The bottom shell is provided with the high-voltage isolation rib positions, so that adjacent high-voltage areas are separated, foreign matters such as cockroaches and the like between the high-voltage areas are prevented from crossing over to strike fire, and the safety performance is enhanced.

Claims

1. The utility model provides a modified microwave variable frequency power supply heat radiation structure, includes shell and built-in radiator (5) in the shell, its characterized in that: the shell comprises a cover body (1) and a bottom shell (2), the cover body (1) is provided with an air guide opening (1-1), the air guide opening (1-1) is a hot air input port of a microwave variable frequency power supply, the cover body (1) and the bottom shell (2) are connected into a whole through a clamping connection structure, and an air guide channel (1-2) is formed in an inner cavity; the air guide channel (1-2) is positioned behind the air guide opening (1-1) and communicated with the air guide opening (1-1), and the air flow reaches the air guide channel (1-2) after passing through the air guide opening (1-1); the radiator (5) is connected with a heating element of the microwave variable frequency power supply in a clinging manner to form a direct heat transfer structure, the radiator (5) is positioned in the air guide channel (1-2) and is completely covered by the air guide channel (1-2), the air guide channel (1-2) is provided with a plurality of air channel branches, and each air channel branch is respectively communicated with the heating element of the microwave variable frequency power supply through air; the radiator (5) consists of a radiator body (5-1), and a first radiating tooth (5-2) and a second radiating tooth (5-3) which are extended out of the radiator body; the heat dissipation teeth and the gaps among the heat dissipation teeth are communicated with the air of the air duct branches to form a multi-channel heat dissipation structure; a heat radiation fan (3-13) is arranged at the air guide opening (1-1), and an air blowing opening of the heat radiation fan (3-13) faces to a heating element of the microwave variable frequency power supply board (3) and is communicated with air channel branch air to form a multi-channel reinforced heat radiation structure.

2. The improved heat dissipation structure of the microwave variable frequency power supply according to claim 1, wherein: the first heat dissipation teeth (5-2) are positioned on the front surface (5-4) of the heat sink and are vertical to the heat sink body (5-1); the second heat dissipation teeth (5-3) are positioned on the back surface of the heat sink (5) and are vertical to the heat sink body (5-1); the thickness of the radiating teeth is equal or designed according to the radiating path, and the thickness of the radiating teeth from the radiator body (5-1) to the tail end of the radiating teeth is gradually reduced from big to small; the thickness of each radiating tooth is 1-2mm, and the surface of each radiating tooth is provided with a corrugated surface, a spherical surface or a rhombic surface; the distance between the two heat dissipation teeth is more than 3mm, and heat is dissipated to the upper surfaces of the first heat dissipation tooth (5-2) and the second heat dissipation tooth (5-3) from the radiator body (5-1); the bottom surface support column (5-5) of the radiator (5) is tightly attached to the printed circuit board of the microwave variable frequency power supply and used for supporting the whole radiator (5).

3. The improved microwave variable frequency power supply heat dissipation structure of claim 1 or 2, wherein: a first air guide blade (1-8), a second air guide blade (1-9) and a third air guide blade (1-10) are arranged in the cover body (1), the first air guide blade (1-8) and the second air guide blade (1-9) are turned outwards, the turning-outwards angle of the first air guide blade (1-8) is 30-90 degrees, the turning-outwards angle of the second air guide blade (1-9) is 30-90 degrees, no gap is reserved between the second air guide blade (1-9) and an adjacent heating component, so that the area of the air guide port (1-1) is increased, and more air flow is guided into the air guide port (1-1); the third wind guide blade (1-10) and the side surface of the wind guide channel (1-2) are the same and close to the shell side of the microwave oven, and the third wind guide blade is not turned outwards and extends for 10-30 mm. The air guide duct (1-2) is provided with four air duct branches, and comprises a first air duct (1-2-1), a second air duct (1-2-2), a third air duct (1-2-3) and a fourth air duct (1-2-4), wherein the length of the cover body (1) is longer than that of the variable frequency power supply board (3), the air guide duct (1-2) completely covers the radiator (5), or the length of the air guide duct (1-2) exceeds that of the radiator (5) by 2-10 mm; the thickness of the radiator body (5-1) is 3-7mm, the second heat dissipation teeth (5-3) are positioned in the second air channel (1-2-2), the second air guide blades (1-9) guide air to the second heat dissipation teeth (5-3), and heat on the second heat dissipation teeth (5-3) is taken away through the second air channel (1-2-2) along the second heat dissipation teeth (5-3); the second heat dissipation teeth (5-3) are long-strip-shaped, and the surfaces of the second heat dissipation teeth are provided with corrugated surfaces, spherical surfaces, rhombic surfaces or other regular and irregular surfaces so as to enlarge the heat dissipation radiation area and the heat dissipation effect; the radiator (5) is made of aluminum, copper or metal with good heat-conducting property.

4. The utility model provides a microwave variable frequency power supply with improve heat radiation structure, includes heat radiation structure and microwave power supply board (3), heat radiation structure includes shell and built-in radiator (5) in the shell, its characterized in that: the shell comprises a cover body (1) and a bottom shell (2), the cover body (1) is provided with an air guide opening (1-1), the air guide opening (1-1) is a hot air input port of a microwave variable frequency power supply, the cover body (1) and the bottom shell (2) are connected into a whole through a clamping connection structure, and an air guide channel (1-2) is formed in an inner cavity; the radiator (5) is connected with a heating element of the microwave variable frequency power supply in a clinging manner to form a direct heat transfer structure, the radiator (5) is positioned in the air guide channel (1-2) and is completely covered by the air guide channel (1-2), the air guide channel (1-2) is provided with a plurality of air channel branches, and each air channel branch is respectively communicated with the heating element of the microwave variable frequency power supply through air; the radiator (5) consists of a radiator body (5-1), and a first radiating tooth (5-2) and a second radiating tooth (5-3) which are extended out of the radiator body; the heat dissipation teeth and the gaps among the heat dissipation teeth are communicated with the air of the air duct branches to form a multi-channel heat dissipation structure; a heat radiation fan (3-13) is arranged at the air guide opening (1-1), and an air blowing opening of the heat radiation fan (3-13) faces to a heating element of the microwave variable frequency power supply board (3) and is communicated with air channel branch air to form a multi-channel reinforced heat radiation structure; the variable frequency power supply board (3) comprises a printed circuit board (3-8), and a first diode (3-1), a second diode (3-2), a transformer (3-3), a first capacitor (3-4), a second capacitor (3-5), a radiator (5), a first semiconductor element (3-6), a second semiconductor element (3-7), a cement resistor (3-11) and an inductor (3-12) which are arranged in the printed circuit board (3-8), wherein the transformer (3-3) is composed of a transformer framework (3-3-1), a primary winding (3-3-2), a secondary winding (3-3-3), a filament winding (3-3-4) and a high-voltage lamp wire (4), and the primary winding (3-3-2) is connected with a voltage input end of a power supply, The secondary winding (3-3-3) is connected with a voltage output end of a power supply; the air flow flowing through the first air duct (1-2-1) and the second air duct (1-2-2) of the shell finally flows through the inductor (3-9) to take away heat on the inductor (3-9), the first diode (3-1) and the second diode (3-2) are located beside the transformer and close to one side of the air guide opening (1-1), and the second diode (3-2) and the primary winding (3-3-2) are located at the third air duct (1-2-3); the first diode (3-1) and the secondary winding (3-3-3) form a fourth air duct (1-2-4), and the air flows of the third air duct (1-2-3) and the fourth air duct (1-2-4) flow through the cement resistor (3-11) to take away heat on the cement resistor (3-11); the cement resistor (3-11) is provided with two metal pins so as to enlarge the heat dissipation area of the cement resistor (3-11) body, and the cement resistor (3-11) body is 10-20mm away from the printing plate (3-8).

5. A microwave frequency conversion power supply with an improved heat dissipation structure according to claim 4, wherein: the first heat dissipation teeth (5-2) are positioned on the mounting surfaces of the first semiconductor element (3-6) and the second semiconductor element (3-7) of the microwave variable frequency power panel (3), and heat is dissipated to the first heat dissipation teeth (5-2) and the second heat dissipation teeth (5-3) from the radiator body (5-1); a bottom surface support column (5-5) of the radiator (5) is tightly attached to a printed circuit board (3-8) of the microwave variable frequency power supply board (3) and used for supporting the whole radiating fin, screw holes (5-6) are formed, and screws are screwed from the bottom of the printed circuit board (3-8) to fix the radiator (5); the cover body (1) is longer than the variable frequency power supply board (3), the air guide channel (1-2) completely wraps the radiator (5) so as to avoid the radiator (5) from contacting with other adjacent devices and prevent high-voltage electricity on the radiator (5) from being conducted to other adjacent devices, or avoid the air guide channel (1-2) from being too long, so that radiating airflow is not smoothly dissipated, and heat is trapped in the air guide channel (1-2); the thickness of the radiator body (5-1) is 3-7 mm; the first semiconductor component (3-6), the second semiconductor component (3-7), the first capacitor (3-4) and the second capacitor (3-5) of the variable frequency power supply board (3) are located in the first air duct (1-2-1), wherein the first capacitor (3-4) and the second capacitor (3-5) are arranged in the first air duct (1-2-1) side by side or are mutually perpendicular and arranged in the first air duct (1-2-1) in an L shape; the first capacitors (3-4) and the second capacitors (3-5) of the variable frequency power panel (3) are preferably and orderly arranged in a row in the first air duct (1-2-1) and close to the transformer (3-3), and spaces are reserved for the first semiconductor components (3-6) and the second semiconductor components (3-7) so that more air can take away heat of the first semiconductor components (3-6), the second semiconductor components (3-7) and the first heat dissipation teeth (5-2) to ensure the heat dissipation effects of the first semiconductor components (3-6) and the second semiconductor components (3-7).

6. A microwave frequency conversion power supply with an improved heat dissipation structure according to claim 4 or 5, wherein: on the other side of the first air duct (1-2-1), the transformer framework (3-3-1) is provided with an elliptical groove, so that the heat of the primary winding (3-3-2) is dissipated from the elliptical groove and is taken away by the air of the first air duct (1-2-1) for heat dissipation; the heat on the transformer (3-3), the first capacitor (3-4) and the second capacitor (3-5) is also taken away by the airflow of the first air duct (1-2-1) for heat dissipation; the first semiconductor component (3-6) and the second semiconductor component (3-7) are locked on the front surface (5-4) of the radiating fin through screws respectively; the front surface (5-4) of the radiating fin is of a smooth and flat structure.

7. A microwave frequency conversion power supply with an improved heat dissipation structure according to claim 4 or 5, wherein: the primary winding (3-3-2) and the secondary winding (3-3-3) are of circular structures, and cold air enters the air guide opening (1-1), passes through the second diode (3-2) to the primary winding (3-3-2) and flows through the upper part and the lower part of the primary winding (3-3-2); cold air enters the air guide opening (1-1) and then passes through the first diode (3-1) to reach the secondary winding (3-3-3); and flow over and under the secondary winding (3-3-3); the distance between the first diode (3-1), the second diode (3-2), the primary winding (3-3-2), the secondary winding (3-3-3) and the printed circuit board (3-8) is 10-20mm, so that enough space is ensured for flowing more air flow; the first diode (3-1) and the second diode (3-2) are respectively arranged in a straight line, and the two straight line structures are parallel to each other or form a certain angle; the first diode (3-1) and the second diode (3-2) are high-voltage diodes; the third guide vanes (1-10) are not turned outwards, and the positions of the third guide vanes relative to the fans (3-13) are closer than the positions of the first guide vanes (1-8) and the second guide vanes (1-9), so that the third guide vanes can be away from the fans (3-13) by 2-10mm and can also cross the fans (3-13) to completely cover airflow; the variable frequency power supply board (3) is provided with a grounding wire (3-10) and a communication terminal (3-12), and the grounding wire is locked on the bottom shell (7) of the microwave oven by a screw through a circular ring terminal so as to achieve a good grounding effect. The communication terminals (3-12) are used for connecting the microwave oven main control board and carrying out communication control with the main control board; reinforcing ribs (1-15) are arranged at the bending position of the cover body (1), and chamfers (1-16) can be added at the bending position to reinforce the mechanical strength of the cover body; the first semiconductor elements (3-6) are rectifier bridge stacks and the second semiconductor elements (3-7) are IGBTs.

8. A microwave frequency conversion power supply with an improved heat dissipation structure according to claim 4 or 5, wherein: the shell includes lid (1) and drain pan (2), its characterized in that: the cover body (1) is provided with an air guide opening (1-1), a wire groove (1-3), a wire hook (1-4), an opening clamping groove (1-5) and a press hinge, the air guide opening (1-1) is a hot air input port of a microwave variable frequency power supply, the wire groove (1-3) is used for placing a wire, and the wire hook (1-4) is used for hooking the wire; the bottom shell (2) is provided with supporting leaves (2-1), bosses (2-2), supporting columns (2-3), supporting ribs (2-4), limiting ribs (2-5), high-pressure isolating ribs (2-6), supporting legs (2-7) and buckling positions (2-11), and the bosses (2-2) of the bottom shell are matched and clamped with the opening clamping grooves (1-5) of the cover body to form a clamping type connecting structure, so that the pressing leaves of the cover body (1) are matched and butted with the supporting leaves (2-1) of the bottom shell; the cover body (1) and the bottom shell (2) are connected into a whole through a clamping connection structure, a wind guide channel (1-2) is formed in an inner cavity, the support columns (2-3) are used for supporting the variable frequency power supply board (3) to form a gap wind channel between the variable frequency power supply board (3) and the bottom shell (2), and a plurality of support ribs (2-4) are arranged on the inner side wall of the bottom shell (2) respectively and used for supporting the edge of the variable frequency power supply board (3) to form a side wall gap wind channel; the buckling positions (2-11) are positioned above the supporting ribs (2-4) and are in a trapezoid shape and used for buckling the variable frequency power supply board (3), the limiting ribs (2-5) are arranged on the inner wall of the bottom shell (2) and used for limiting the variable frequency power supply board (3), and the high-voltage isolation ribs (2-6) are provided with two blocks and arranged on one side of the bottom shell and used for isolating a high-voltage power supply of the variable frequency power supply board (3).

9. A microwave variable frequency power supply with an improved heat dissipation structure according to claim 8, wherein: the supporting leaves (2-1) of the bottom shell (2) comprise a first supporting leaf and a second supporting leaf, the supporting columns (2-3) of the bottom shell (2) comprise a first supporting column, a second supporting column and a third supporting column, and four supporting legs (2-7) of the bottom shell (2) comprise first to fourth supporting legs; the cover body (1) is provided with a first pressing hinge (1-6) and a second pressing hinge (1-7), the first pressing hinge (1-6) and the second pressing hinge (1-7) are respectively tightly attached to a first supporting leaf (2-1) of the bottom shell (2), a first pressing rib (1-11) and a second pressing rib (1-12) of the cover body are matched with the first pressing hinge (1-6), and the first supporting leaf (2-1) of the bottom shell (2) is embedded and clamped tightly; the third pressing rib (1-13) and the fourth pressing rib (1-14) of the cover body are matched with the second pressing hinge (1-7) to tightly embed and clamp the second supporting leaf (2-1) of the bottom shell; the outer wall of a first supporting leaf (2-1) of the bottom shell (2) is provided with a first positioning column (2-11) for positioning a first pressing hinge (1-6) of the cover body when the cover body (1) is assembled, and the outer wall of a second supporting leaf (2-1) of the bottom shell (2) is provided with a second positioning column (2-11) for positioning a second pressing hinge (1-7) of the cover body when the cover body (1) is assembled; the length of the first pressing hinge (1-6) of the cover body is less than that of the first supporting hinge (2-1), and the length of the second pressing hinge (1-7) of the cover body is less than that of the second supporting hinge (2-1); the first supporting column and the second supporting column of the bottom shell (2) are located on opposite corners of the bottom shell (2) and comprise screw holes, the height of the screw holes is larger than or equal to 5mm, a hollow supporting structure for the variable frequency power supply board (3) is formed, when the variable frequency power supply board (3) is placed on the bottom shell (2), screws are driven into the first supporting column (2-3) through the first screw holes in the variable frequency power supply board (3) and driven into the second supporting column (2-3) through the second screw holes; the third supporting column (2-3) is supported at the high-voltage copper-free position of the variable-frequency power supply board (3) and is provided with a fillet structure so as to avoid stress fracture of the printing board; the supporting ribs (2-4) of the bottom shell comprise first supporting ribs, second supporting ribs and third supporting ribs, the buckling positions (2-11) of the bottom shell comprise first buckling positions and second buckling positions, the first buckling positions are located above the first supporting ribs and provided with reinforcing ribs, the second buckling positions are located above the second supporting ribs and provided with reinforcing ribs, the first buckling positions and the second buckling positions are in a right-angled ladder shape, grooves are formed in the positions right below the first buckling positions and the second buckling positions, when the variable-frequency power panel (3) is placed on the bottom shell (2) from the upper side, the variable-frequency power panel (3) slides across a trapezoidal bevel edge, the buckling positions (2-11) are stressed and deformed to enable the variable-frequency power panel (3) to reach the installation position, and the buckling positions (2-11), the first supporting ribs and the second supporting ribs are used for clamping the variable-frequency power panel (3); the first buckling position and the second buckling position are positioned at the diagonal positions of the bottom shell; the limiting ribs (2-5) of the bottom shell (2) are used for separating a gap between the variable frequency power supply board (3) and the second supporting blade so as to prevent the variable frequency power supply board (3) from being damaged by extrusion when being extruded by external force; rib positions with the same width as the limiting ribs (2-5) are respectively arranged on the third supporting rib and the second supporting column; the width of the limiting rib (2-5) is 1-10mm, and the height is greater than the height of the first support column; the bottom shell (2) is provided with two high-voltage isolation ribs, and after the variable-frequency power supply board (3) is arranged in the shell, the high-voltage isolation ribs respectively penetrate through one high-voltage groove of the high-voltage grooves of the variable-frequency power supply board to separate two pins of the first high-voltage diode and the second high-voltage diode so as to prevent short-circuit ignition caused by the fact that cockroaches stretch across the pins; the height of each of the two high-pressure isolating ribs is 10-30 mm.

10. A microwave variable frequency power supply with an improved heat dissipation structure according to claim 9, wherein: connecting ribs (2-9) are arranged between the four supporting legs on the bottom shell (2) and the other three legs respectively to form four isosceles triangles, and the height of the rib positions is 5-30 mm; the bottoms of the first supporting leg, the second supporting leg, the third supporting leg and the fourth supporting leg are respectively provided with a screw hole (2-7-1), and a variable frequency power panel (3) is fixed by driving screws into the screw holes (2-7-1); the heights of the four supporting legs are determined by the spaces of the air guide duct and the magnetron, the distance between the air guide duct (1-2) and the magnetron is more than 10mm, and the heights of the four supporting legs are 0-50 mm; the first supporting leg, the second supporting leg, the third supporting leg and the fourth supporting leg are additionally provided with trapezoidal supporting ribs on the basis of the original connecting ribs so as to strengthen the stability of the four supporting legs; the outward turning part of the first guide vane (1-8) and the second guide vane (1-9), the extension part of the third guide vane (1-10) and the bottom shell (2) jointly form an air guide opening (1-1); the air guide port (1-1) is provided with a wire groove (1-3) for placing a high-voltage lamp wire (4) of the variable-frequency power supply board (3), and the wire groove (1-3) is S-shaped, L-shaped or other irregular shapes to form an anti-stretching structure of the high-voltage lamp wire (4); reinforcing ribs are arranged on the edges of the wire grooves (1-3) to form a reinforcing structure of the cover body (1) and prevent the shell from being stressed and damaged due to insufficient mechanical strength after grooving; the wire hook (1-4) at the top of the air guide channel (1-2) is used for hooking the tail end of the high-voltage lamp wire (4) and fixing the wire on the cover body (1); the hook tip of the wire hook (1-4) is slightly inclined inwards, and a half of the thickness of the wire hook is cut from the outer side to the inner side, the hook back of the wire hook (1-4) is provided with a reinforcing rib, and a groove is arranged right below the wire hook.