Frequency converter heat dissipation structure, frequency converter and air compressor

Abstract

The invention provides a frequency converter heat dissipation structure, a frequency converter and an air compressor, and the frequency converter heat dissipation structure comprises a first radiator and a second radiator. The first radiator is used for radiating a rectifier module of the frequency converter; the second radiator is used for radiating the inversion module of the frequency converter; the first heat radiator is provided with a first heat radiation air channel, the second heat radiator is provided with a second heat radiation air channel, the heat radiation structure of the frequency converter further comprises a communication air channel communicated with the first heat radiation air channel and the second heat radiation air channel, and the communication air channel is used for accommodating at least one part of a capacitor module of the frequency converter. Therefore, the heat of the capacitor module is dissipated. According to the technical scheme, the first heat dissipation air channel, the communicating air channel and the second heat dissipation air channel are matched to form the air channel, when the heat dissipation fan in the frequency converter blows air to the air channel, air can flow through the communicating air channel to dissipate heat of the capacitor module in the communicating air channel, and therefore the heat dissipation effect of the capacitor module can be improved.

Description

Technical Field

[0001] The invention belongs to the technical field of frequency converters, and in particular relates to a frequency converter heat dissipation structure, a frequency converter and an air compressor. Background Art

[0002] The frequency converter is a power control device that uses frequency conversion technology and microelectronics technology to control AC motors by changing the motor's operating frequency. The frequency converter is mainly composed of a rectifier module, a capacitor module, an inverter module, a brake unit, a drive unit, a detection unit, and a microprocessor unit. The rectifier module is used to convert the input three-phase power into direct current, the capacitor module is used to filter the direct current output by the rectifier module, and the inverter module is used to convert the direct current filtered by the capacitor module into alternating current. The frequency converter is generally designed with a heat dissipation structure to dissipate heat from the rectifier module and the inverter module, but the heat dissipation effect on the capacitor module is poor and needs to be optimized. Summary of the invention

[0003] Therefore, the present invention provides a frequency converter heat dissipation structure, a frequency converter and an air compressor, and the main technical problem to be solved is: how to improve the heat dissipation effect of the capacitor module in the frequency converter.

[0004] In order to solve the above problems, the present invention provides a frequency converter heat dissipation structure, which includes:

[0005] A first heat sink is used to dissipate heat from a rectifier module of the inverter;

[0006] A second heat sink is used to dissipate heat from the inverter module of the frequency converter;

[0007] Among them, the first radiator has a first heat dissipation duct, the second radiator has a second heat dissipation duct, and the inverter heat dissipation structure also includes a connecting duct connecting the first heat dissipation duct and the second heat dissipation duct, and the connecting duct is used to accommodate at least a part of the capacitor module of the inverter to dissipate heat for the capacitor module.

[0008] In some embodiments, the first heat dissipation duct has a first air outlet, and the second heat dissipation duct has a second air outlet; the first air outlet and the second air outlet are opposite to each other, and there is a gap between them; wherein the inverter heat dissipation structure forms the connecting air duct at the gap.

[0009] In some embodiments, the first heat sink includes first heat dissipation fins, the number of the first heat dissipation fins is more than two, and the first heat dissipation fins are arranged in parallel and spaced apart in sequence, a first heat dissipation channel is formed between each adjacent two first heat dissipation fins, each first heat dissipation channel cooperates to form the first heat dissipation air duct, and the openings of each first heat dissipation channel located on the same side cooperate to form the first air outlet.

[0010] In some embodiments, the first heat sink also includes a first substrate, the first substrate has a first a side and a second a side opposite to each other, and each of the first heat dissipating fins is arranged on the first substrate and is located on the first a side; wherein the first heat sink is connected to the rectifier module through the second a side to dissipate heat from the rectifier module.

[0011] In some embodiments, the second heat sink includes second heat dissipation fins, the number of the second heat dissipation fins is more than two, and the second heat dissipation fins are arranged in parallel and spaced apart in sequence, a second heat dissipation channel is formed between each adjacent second heat dissipation fin, each second heat dissipation channel cooperates to form the second heat dissipation air duct, and the openings of each second heat dissipation channel located on the same side cooperate to form the second air outlet.

[0012] In some embodiments, the second heat sink also includes a second substrate, the second substrate has a first b side and a second b side opposite to each other, and each of the second heat dissipating fins is arranged on the second substrate and is located on the first b side; wherein the second heat sink is connected to the inverter module through the second b side to dissipate heat from the inverter module.

[0013] In some embodiments, the inverter heat dissipation structure further includes a first connecting plate and a second connecting plate, wherein the first connecting plate and the second connecting plate are located on opposite sides of the interval to form side walls on opposite sides of the connecting channel.

[0014] In some embodiments, the first connecting plate is provided with a snap-in for inserting the capacitor of the capacitor module into the connecting air duct, and the snap-in is also used to snap-in with the capacitor; the second connecting plate is used to provide support for the capacitor inserted into the connecting air duct.

[0015] In some embodiments, when the first heat sink includes two or more first heat sink fins, which are arranged in parallel and spaced apart from each other, and the second heat sink includes two or more second heat sink fins, which are arranged in parallel and spaced apart from each other,

[0016] The first heat dissipation fins are arranged in sequence along the first direction of the inverter heat dissipation structure, and the second heat dissipation fins are also arranged in sequence along the first direction. The first connecting plate, the first radiator, the second connecting plate and the second radiator cooperate to enclose the connecting channel, and the connecting channel has openings at both ends in the first direction.

[0017] The present invention further provides a frequency converter, which comprises any one of the frequency converter heat dissipation structures described above.

[0018] In some embodiments, the rectifier module is disposed on the first radiator, the inverter module is disposed on the second radiator, and the capacitor module is located between the rectifier module and the inverter module;

[0019] The inverter further includes a circuit connector, which spans the capacitor module, one end of which is electrically connected to the rectifier module, the other end of which is electrically connected to the inverter module, and the middle part of which is electrically connected to the capacitor module; the circuit connector is used to electrically connect the rectifier module, the capacitor module and the inverter module, so that the output signal of the rectifier module is filtered by the capacitor module and then input to the inverter module.

[0020] In some embodiments, the circuit connector is a busbar, the busbar has a positive busbar and a negative busbar, the busbar is electrically connected to the positive protrusion of the capacitor module through the positive busbar, and is electrically connected to the negative protrusion of the capacitor module through the negative busbar;

[0021] Among them, the negative busbar is closer to the capacitor module than the positive busbar, and the positive busbar is provided with a protrusion. The positive busbar is electrically connected to the positive boss of the capacitor module through the protrusion, and the negative busbar is provided with a first avoidance hole for the protrusion to pass through.

[0022] In some embodiments, the negative busbar is provided with a bolt through hole, and a first bolt is used to pass through the bolt through hole to fix the negative busbar to the negative boss of the capacitor module; the positive busbar is also provided with a second avoidance hole for avoiding the first bolt;

[0023] And / or, the protrusion is fixed to the positive pole protrusion of the capacitor module by a second bolt.

[0024] In some embodiments, the other end of the circuit connector has a pin, and the other end of the circuit connector is electrically connected to the inverter module through the pin, and the pin is in contact with the inverter module.

[0025] In some embodiments, the frequency converter further includes an incoming line component, the incoming line component spans the capacitor module, one end of the incoming line component is located on a side of the capacitor module away from the rectifier module, the other end of the incoming line component is located on a side of the capacitor module close to the rectifier module, and the other end of the incoming line component is electrically connected to the rectifier module, the incoming line component introduces three-phase electricity through one end thereof, and leads the three-phase electricity to the rectifier module through the other end thereof;

[0026] Wherein, the incoming line assembly is located on a side of the circuit connector away from the capacitor module.

[0027] The present invention also provides an air compressor, which comprises any one of the frequency converters described above.

[0028] The inverter heat dissipation structure, inverter and air compressor provided by the present invention have the following beneficial effects:

[0029] 1. The first heat dissipation duct, the connecting duct and the second heat dissipation duct cooperate to form an air duct. When the heat dissipation fan in the inverter blows air to the air duct, the wind can flow through the connecting duct to dissipate the heat of the capacitor module in the connecting duct, thereby improving the heat dissipation effect of the capacitor module.

[0030] 2. The power of the first radiator can be adapted to the power of the rectifier module, and the power of the second radiator can be adapted to the power of the inverter module. The rectifier module and the inverter module of the inverter each use a radiator for heat dissipation, which can not only improve the heat dissipation efficiency, but also facilitate the real-time monitoring of the temperature of the rectifier module and the inverter module, thereby preventing the heat influence of different modules.

[0031] 3. The inverter module and the rectifier module are respectively arranged on both sides of the capacitor module, such as the front and back sides. The circuit connector spans the capacitor module and is electrically connected to the inverter module and the rectifier module, which is similar to "building a bridge" to avoid obstacles. Through the bridge connection circuit, the electromagnetic interference between the rectifier module and the inverter module is reduced, the stability of the system is improved, the layout design of the line is optimized, and the disassembly and assembly are more convenient. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] In order to more clearly illustrate the implementation methods of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for the implementation methods or the description of the prior art. The drawings described below are only exemplary, and for ordinary technicians in this field, other implementation drawings can be derived from the provided drawings without creative work.

[0033] Figure 1 It is a schematic diagram of assembling the inverter heat dissipation structure and the capacitor module of the present invention;

[0034] Figure 2 It is a partial structural schematic diagram of a frequency converter provided by an embodiment of the present invention;

[0035] Figure 3 yes Figure 2 A structural diagram of the medium frequency converter from another perspective;

[0036] Figure 4 It is a connection diagram of the rectifier module, capacitor module and inverter module;

[0037] Figure 5 yes Figure 4 A top view of the structure in the middle;

[0038] Figure 6 It is a schematic diagram of the structure of the positive busbar;

[0039] Figure 7 It is a schematic diagram of the structure of the negative busbar.

[0040] The accompanying drawings are marked as follows:

[0041] 1. First heat sink; 2. Second heat sink; 3. Rectifier module; 4. Inverter module; 5. Circuit connector; 6. Incoming line assembly; 7. Capacitor module; 8. First connecting plate; 9. Second connecting plate; 10. Connecting air duct; 11. First substrate; 12. First heat sink fin; 11a. First a side; 11b. Second a side; 13. Rectifier positive metal sheet; 14. Rectifier negative metal sheet; 15. Contactor; 17. Positive busbar; 18. Negative busbar; 19. Outgoing line assembly; 20a, first bolt; 20b, second bolt; 21, second substrate; 22, second heat dissipation fin; 21a, first b side; 21b, second b side; 31, capacitor; 61, metal sheet; 81, bayonet; 100, first heat dissipation duct; 101, first air outlet; 171, raised portion; 172, second avoidance hole; 181, pin; 182, bolt through hole; 183, first avoidance hole; 200, second heat dissipation duct; 201, second air outlet; a, first direction. DETAILED DESCRIPTION

[0042] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments. The following description of at least one exemplary embodiment is actually only illustrative and is by no means intended to limit the present invention and its application or use. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0043] In the description of the present invention, it is necessary to understand that the directions or positional relationships indicated by directional words such as "front, back, up, down, left, right", "lateral, vertical, perpendicular, horizontal" and "top, bottom" are usually based on the directions or positional relationships shown in the drawings. They are only for the convenience of describing the present invention and simplifying the description. Unless otherwise specified, these directional words do not indicate or imply that the devices or elements referred to must have a specific direction or be constructed and operated in a specific direction. Therefore, they cannot be understood as limiting the scope of protection of the present invention. The directional words "inside and outside" refer to the inside and outside relative to the contours of each component itself.

[0044] For ease of description, spatially relative terms such as "above", "above", "on the upper surface of", "above", etc. may be used here to describe the spatial positional relationship between a device or feature and other devices or features as shown in the figure. It should be understood that spatially relative terms are intended to include different orientations of the device in use or operation in addition to the orientation described in the figure. For example, if the device in the accompanying drawings is inverted, the device described as "above other devices or structures" or "above other devices or structures" will be positioned as "below other devices or structures" or "below other devices or structures". Thus, the exemplary term "above" can include both "above" and "below". The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatially relative descriptions used here are interpreted accordingly.

[0045] In addition, it should be noted that the use of terms such as "first" and "second" to limit components is only for the convenience of distinguishing the corresponding components. If not otherwise stated, the above terms have no special meaning and therefore cannot be understood as limiting the scope of protection of the present invention.

[0046] See also Figure 1-3 As shown, according to an embodiment of the present invention, there is provided a heat dissipation structure of a frequency converter, which includes a first heat sink 1 and a second heat sink 2. The first heat sink 1 is used to dissipate heat from a rectifier module 3 of the frequency converter. The second heat sink 2 is used to dissipate heat from an inverter module 4 of the frequency converter. The first heat sink 1 has a first heat dissipation duct 100, and the second heat sink 2 has a second heat dissipation duct 200. The heat dissipation structure of the frequency converter also includes a connecting duct 10 connecting the first heat dissipation duct 100 and the second heat dissipation duct 200. The connecting duct 10 is used to accommodate at least a portion of the capacitor module 7 of the frequency converter to dissipate heat from the capacitor module 7.

[0047] In the above example, the first heat dissipation duct 100, the connecting air duct 10 and the second heat dissipation duct 200 cooperate to form an air duct. When the cooling fan in the inverter blows air to the air duct, the wind can flow through the connecting air duct 10 to dissipate the heat of the capacitor module 7 in the connecting air duct 10, thereby improving the heat dissipation effect of the capacitor module 7.

[0048] The power of the first radiator 1 can be adapted to the power of the rectifier module 3, and the power of the second radiator 2 can be adapted to the power of the inverter module 4. The rectifier module 3 and the inverter module 4 of the inverter each use a radiator to dissipate heat separately, which can not only improve the heat dissipation efficiency, but also facilitate the real-time monitoring of the temperature of the rectifier module 3 and the inverter module 4, thereby preventing the heat influence of different modules.

[0049] The positions of the first heat dissipation duct 100, the connecting duct 10 and the second heat dissipation duct 200 can be set according to actual conditions. Figure 1 and Figure 2 As shown, the first heat dissipation duct 100, the connecting duct 10 and the second heat dissipation duct 200 cooperate to form a stepped heat dissipation duct. Specifically, a first step can be formed between the first heat dissipation duct 100 and the connecting duct 10, and a second step can be formed between the connecting duct 10 and the second heat dissipation duct 200.

[0050] In order to form the aforementioned connecting air duct 10, in some embodiments, as Figure 2 As shown, the aforementioned first heat dissipation duct 100 has a first air outlet 101, and the second heat dissipation duct 200 has a second air outlet 201. The first air outlet 101 and the second air outlet 201 are opposite to each other, and there is a gap between the first air outlet 101 and the second air outlet 201. The aforementioned inverter heat dissipation structure forms the aforementioned connecting air duct 10 at the gap.

[0051] In the above example, the wind may flow into the connecting air duct 10 from the first air vent 101 and then flow out from the second air vent 201; or the wind may flow into the connecting air duct 10 from the second air vent 201 and then flow out from the first air vent 101. Whether the wind flows into the connecting air duct 10 from the first air vent 101 or from the second air vent 201 can be determined according to the actual situation. The position of the cooling fan can be designed.

[0052] In some embodiments, Figure 1-3 As shown, the aforementioned first heat sink 1 may include first heat dissipation fins 12, which may be plate-shaped, and the number of first heat dissipation fins 12 is more than two, and they are arranged in parallel and spaced order. A first heat dissipation channel is formed between each two adjacent first heat dissipation fins 12. Each first heat dissipation channel cooperates to form the aforementioned first heat dissipation air channel 100, and the openings of each first heat dissipation channel on the same side cooperate to form the aforementioned first air outlet 101.

[0053] In the above example, the first heat dissipation fins 12 are provided to facilitate heat dissipation of the first heat dissipation duct 100 .

[0054] In some embodiments, Figure 1As shown, the aforementioned first heat sink 1 may also include a first substrate 11, the first substrate 11 having a first a side 11a and a second a side 11b opposite to each other, and the aforementioned first heat dissipation fins 12 are all arranged on the first substrate 11, and are all located on the first a side 11a. For example, each first heat dissipation fin 12 may be integrally formed on the first a side 11a of the first substrate 11, so that the connection stability between each first heat dissipation fin 12 and the first substrate 11 can be improved. Among them, the first heat sink 1 is connected to the rectifier module 3 through the second a side 11b to dissipate heat for the rectifier module 3.

[0055] In the above example, since the first heat dissipation fins 12 are arranged on the same side of the first substrate 11 (i.e., the aforementioned first a side 11a), this is beneficial for installing the rectifier module 3 on the other side of the first substrate 11 (i.e., the aforementioned second a side 11b), thereby avoiding interference of the first heat dissipation fins 12 with the installation of the rectifier module 3.

[0056] In some embodiments, Figure 1 As shown, the aforementioned second heat sink 2 may include second heat dissipation fins 22, the number of which is more than two and arranged in parallel and spaced order. A second heat dissipation channel is formed between each two adjacent second heat dissipation fins 22. Each second heat dissipation channel cooperates to form the aforementioned second heat dissipation air channel 200, and the openings of each second heat dissipation channel on the same side cooperate to form the aforementioned second air outlet 201.

[0057] In the above example, the second heat dissipation fins 22 are provided to facilitate heat dissipation of the second heat dissipation duct 200 .

[0058] In some embodiments, Figure 1 As shown, the aforementioned second heat sink 2 may further include a second substrate 21, and the second substrate 21 has a first b side 21a and a second b side 21b opposite to each other. Each second heat sink fin 22 is disposed on the second substrate 21 and is located on the first b side 21a. For example, each second heat sink fin 22 may be integrally formed on the first b side 21a of the second substrate 21, so that the connection stability between each second heat sink fin 22 and the second substrate 21 may be improved. The second heat sink 2 is connected to the inverter module 4 through the second b side 21b to dissipate heat from the inverter module 4.

[0059] In the above example, since the second heat dissipation fins 22 are arranged on the same side of the second substrate 21 (i.e., the aforementioned first b side 21a), this is beneficial for installing the inverter module 4 on the other side of the second substrate 21 (i.e., the aforementioned second b side 21b), thereby avoiding interference of the second heat dissipation fins 22 with the installation of the inverter module 4.

[0060] In some embodiments, the second a-side 11b and the second b-side 21b are both located on the same side of the inverter heat dissipation structure.

[0061] In the above example, since the second a side 11b and the second b side 21b are both located on the same side of the inverter heat dissipation structure, when the rectifier module 3 is installed on the second a side 11b and the inverter module 4 is installed on the second b side 21b, the rectifier module 3 and the inverter module 4 can be located on the same side of the inverter heat dissipation structure, which is beneficial to the electrical connection between the rectifier module 3 and the inverter module 4.

[0062] In some embodiments, Figure 1-3 As shown, the inverter heat dissipation structure may further include a first connecting plate 8 and a second connecting plate 9. The first connecting plate 8 and the second connecting plate 9 are located on opposite sides of the aforementioned interval to form side walls on opposite sides of the aforementioned communication channel 10.

[0063] In the above example, by arranging the first connecting plate 8 and the second connecting plate 9 to form the side walls on opposite sides of the connecting channel 10, it is possible to prevent the connecting channel 10 from leaking air from the side where the first connecting plate 8 and the side where the second connecting plate 9 are located, thereby improving the heat dissipation efficiency of the capacitor module 7 by the wind in the connecting channel 10.

[0064] Among them, Figure 2 As shown, the first connecting plate 8 and the second connecting plate 9 can both be sheet metal parts. The two ends of the first connecting plate 8 can be connected to the first radiator 1 and the second radiator 2 respectively, so that the first radiator 1 and the second radiator 2 can form a whole through the first connecting plate 8 and the second connecting plate 9. The second connecting plate 9 can be connected to the first radiator 1.

[0065] In some embodiments, Figure 1 As shown, the first connecting plate 8 is provided with a bayonet 81 for inserting the capacitor 31 of the capacitor module 7 into the connecting air duct 10. The bayonet 81 is also used for engaging with the capacitor 31. The second connecting plate 9 is used to provide support for the capacitor 31 inserted into the connecting air duct 10.

[0066] In the above example, the capacitor 31 is inserted into the connecting air duct 10 through the bayonet 81, the upper part of the capacitor 31 is clamped by the bayonet 81, and the lower part of the capacitor 31 is supported by the second connecting plate 9. The bayonet 81 cooperates with the second connecting plate 9 to keep the capacitor 31 stable.

[0067] In some embodiments, Figure 1-3As shown, when the first heat sink 1 includes first heat sink fins 12, the number of the first heat sink fins 12 is more than two and they are arranged in parallel and spaced order, and the second heat sink 2 includes second heat sink fins 22, the number of the second heat sink fins 22 is more than two and they are arranged in parallel and spaced order, the aforementioned first heat sink fins 12 can be arranged in sequence along the first direction a of the inverter heat sink structure of the present invention, and the aforementioned second heat sink fins 22 can also be arranged in sequence along the first direction a of the inverter heat sink structure of the present invention. The aforementioned first connecting plate 8, the first heat sink 1, the second connecting plate 9 and the second heat sink 2 cooperate to enclose the aforementioned connecting channel 10, and the connecting channel 10 has openings at both ends in the first direction a.

[0068] The first direction a mentioned above can be the length direction, width direction or height direction of the inverter heat dissipation structure of the present invention. The following takes the first direction a as the width direction of the inverter heat dissipation structure of the present invention as an example. When the first direction a is the width direction of the inverter heat dissipation structure, since the aforementioned first heat dissipation fins 12 and second heat dissipation fins 22 are arranged in sequence along the width direction of the inverter heat dissipation structure, the first heat dissipation duct 100 formed by the clearance fit of the first heat dissipation fins 12 is a channel for air flow along the length direction of the inverter heat dissipation structure. Similarly, the second heat dissipation duct 200 formed by the clearance fit of the second heat dissipation fins 22 is also a channel for air flow along the length direction of the inverter heat dissipation structure. In this way, when the above-mentioned inverter heat dissipation structure is installed in the inverter housing, the side walls on both sides of the width direction of the inverter housing can be used to cover the openings of the connecting channel 10 at both ends of the width of the inverter housing to further reduce air leakage in the connecting duct 10 and improve the heat dissipation of the capacitor module 7 by the wind in the connecting duct 10; and the space in the length direction of the inverter housing can also be used to provide air flow space for the first heat dissipation duct 100 and the second heat dissipation duct 200 to facilitate air flow.

[0069] The present invention further provides an inverter, which may include any of the inverter heat dissipation structures described above. Since the inverter adopts the inverter heat dissipation structure described above, the first heat dissipation duct 100, the connecting duct 10 and the second heat dissipation duct 200 cooperate to form an air duct. When the heat dissipation fan in the inverter blows air to the air duct, the wind can flow through the connecting duct 10 to dissipate the heat of the capacitor module 7 in the connecting duct 10, thereby improving the heat dissipation effect of the capacitor module 7.

[0070] In some embodiments, the aforementioned rectifier module 3 is disposed on the first heat sink 1 , the inverter module 4 is disposed on the second heat sink 2 , and the capacitor module 7 is located between the rectifier module 3 and the inverter module 4 .

[0071] The rectifier module 3 is used to convert the input three-phase power into direct current output. The capacitor module 7 is used to filter the direct current output by the rectifier module 3. The inverter module 4 is used to convert the direct current filtered by the capacitor module 7 into alternating current output.

[0072] It should be noted that the structures of the rectifier module 3 , capacitor module 7 and inverter module 4 are all prior art and will not be described in detail here.

[0073] In some embodiments, Figure 2-Figure 4 As shown, the aforementioned frequency converter further includes a circuit connector 5, which may be a busbar, etc. The circuit connector 5 spans the capacitor module 7, one end of the circuit connector 5 is electrically connected to the rectifier module 3, the other end of the circuit connector 5 is electrically connected to the inverter module 4, and the middle of the circuit connector 5 is electrically connected to the capacitor module 7. The circuit connector 5 is used to electrically connect the rectifier module 3, the capacitor module 7 and the inverter module 4, so that the output signal of the rectifier module 3 is filtered by the capacitor module 7 and then input to the inverter module 4.

[0074] In the above example, the inverter module 4 and the rectifier module 3 are respectively arranged on both sides of the capacitor module 7, such as the front and rear sides, and the circuit connector 5 crosses the capacitor module 7 to electrically connect with the inverter module 4 and the rectifier module 3, which is similar to "bridge" to avoid obstacles, so sometimes this connection loop of the circuit connector 5 can be called a "bridge connection loop". Through this bridge connection loop, the electromagnetic interference between the rectifier module 3 and the inverter module 4 is reduced, the stability of the system is improved, the layout design of the line is optimized, and the disassembly and assembly are more convenient.

[0075] In a specific application example, the capacitor module 7 is higher than the rectifier module 3 and the inverter module 4 on both sides, so that the three form a convex structure with a high middle and low sides.

[0076] In some embodiments, Figure 3 , Figure 6 and Figure 7 As shown, the aforementioned circuit connector 5 is a busbar. The busbar has a positive busbar 17 and a negative busbar 18. The busbar is electrically connected to the positive pole boss of the capacitor module 7 through the positive busbar 17, and is electrically connected to the negative pole boss of the capacitor module 7 through the negative busbar 18. Among them, the negative busbar 18 is closer to the capacitor module 7 relative to the positive busbar 17. A protrusion 171 is provided on the positive busbar 17, and the positive busbar 17 is electrically connected to the positive pole boss of the capacitor module 7 through the protrusion 171, and a first avoidance hole 183 is provided on the negative busbar 18 for the protrusion 171 to pass through.

[0077] In the above example, by arranging both the positive bus bar 17 and the negative bus bar 18 in layers, it is possible to prevent the positive bus bar 17 and the negative bus bar 18 from coming into contact with each other and causing a short circuit.

[0078] In some embodiments, the aforementioned negative busbar 18 may be provided with a bolt through hole 182, and the first bolt 20a is used to pass through the bolt through hole 182 to fix the negative busbar 18 to the negative pole boss of the capacitor module 7. The positive busbar 17 is also provided with a second avoidance hole 172 for avoiding the first bolt 20a, so as to avoid the positive busbar 17 from contacting the first bolt 20a and causing a short circuit.

[0079] In some embodiments, the aforementioned protrusion 171 can be fixed to the positive electrode protrusion of the capacitor module 7 by a second bolt 20b to improve the electrical connection stability between the protrusion 171 and the positive electrode protrusion.

[0080] It should be noted here that the above-mentioned raised portion 171 can be processed by a punch.

[0081] In some embodiments, the other end of the circuit connector 5 may have a pin 181, and the other end of the circuit connector 5 is electrically connected to the inverter module 4 through the pin 181. The pin 181 fits the inverter module 4 to prevent the problem of mismatch.

[0082] In some embodiments, Figure 2-3 As shown, the aforementioned frequency converter may further include an incoming line component 6, and also includes an incoming line component 6, the incoming line component 6 spans the capacitor module 7, one end of the incoming line component 6 is located on the side of the capacitor module 7 away from the rectifier module 3, the other end of the incoming line component 6 is located on the side of the capacitor module 7 close to the rectifier module 3, and the other end of the incoming line component 6 is electrically connected to the rectifier module 3. The incoming line component 6 introduces three-phase electricity through one end thereof, and leads the three-phase electricity to the rectifier module 3 through the other end thereof.

[0083] In the above example, by making the incoming line assembly 6 cross the capacitor module 7, the space utilization inside the inverter can be greatly improved, the line layout is more convenient, and the disassembly and assembly are more convenient.

[0084] In some embodiments, Figure 4 As shown, the aforementioned incoming line assembly 6 may include three metal sheets 61, and the three metal sheets 61 may all be copper sheets. The incoming line assembly 6 spans the capacitor module 7 through the three metal sheets 61, and one end of the three metal sheets 61 constitutes one end of the aforementioned incoming line assembly 6, which is used to introduce three-phase electricity. The other end of the three metal sheets 61 constitutes the other end of the aforementioned incoming line assembly 6, so as to lead the three-phase electricity to the rectifier module 3.

[0085] In some embodiments, the aforementioned incoming line assembly 6 is located on a side of the circuit connector 5 that is away from the capacitor module 7 to facilitate the introduction of three-phase electricity by the incoming line assembly 6 .

[0086] In a specific application example, Figure 3-5As shown, each of the above three metal sheets 61 can be in a "Ji" shape. Among them, the three "Ji"-shaped metal sheets 61 form an incoming line assembly 6. The incoming line assembly 6 straddles the capacitor module 7 and is located on the side of the circuit connector 5, such as a busbar, away from the capacitor module 7. The busbar has opposite first and second ends. The busbar is connected to the rectification module 3 through the first end and is connected to the inversion module 4 through the second end. The incoming line assembly 6 is connected to the rectification module 3 at the back. The incoming line assembly 6 is connected to the input end of the rectification module 3 by bolts. For example, the incoming line assembly 6 can be fixed to the diode connection terminal at the input end of the rectification module 3 by bolts. The negative pole of the output end of the rectification module 3 is connected to the negative pole of the first end of the busbar through a rectification negative metal sheet 14, such as a copper sheet; the positive pole of the output end of the rectification module 3 is first connected to the contactor 15 through a rectification positive metal sheet 13, such as a copper sheet, and then connected to the positive pole of the first end of the busbar, thus forming a complete rectification circuit. The positive and negative poles of the second end of the busbar are both connected to the inversion module 4 through pins, and the pins can be fully attached to the input end of the inversion module 4. The output end of the inversion module 4 is connected to the outgoing line assembly 19, forming a complete inversion circuit. The middle of the positive busbar 17 has a first protrusion connected to the positive pole of the capacitor module 7, and the middle of the negative busbar 18 has a second protrusion connected to the negative pole of the capacitor module 7. Both the first protrusion and the second protrusion are connected to the capacitor module 7 by bolts 20, enabling the capacitor module 7 to achieve the filtering function of the direct current output by the rectification module 3. Among them, the first protrusion and the second protrusion are arranged at intervals to avoid each other. Both the first protrusion and the second protrusion can be processed by the method of a convex die. Since in this design, the inversion module 4 and the rectification module 3 are respectively arranged on the front and back sides of the capacitor module 7, making the connection circuit resemble "bridging" to avoid obstacles, it is thus called a "bridge connection circuit". Through this connection circuit, each component and the corresponding module are completely connected together and fully perform their corresponding functions. At the same time, the space utilization rate is greatly improved, the wiring layout is more convenient, and the disassembly and assembly are more convenient.

[0087] The present invention also provides an air compressor, which may include the frequency converter of any one of the above. Among them, due to the adoption of the above frequency converter in the air compressor, the first heat dissipation air duct 100, the connecting air duct 10, and the second heat dissipation air duct 200 cooperate to form an air duct. When the heat dissipation fan in the frequency converter blows air into the air duct, the air can flow through the connecting air duct 10 to dissipate heat from the capacitor module 7 in the connecting air duct 10, thereby improving the heat dissipation effect of the capacitor module 7.

[0088] It is easy for those skilled in the art to understand that, on the premise of no conflict, the advantageous technical features of the above various methods can be freely combined and superimposed.

[0089] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principle of the present invention shall be included in the protection scope of the present invention. The above description is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and variations can be made without departing from the technical principles of the present invention. These improvements and variations should also be regarded as the protection scope of the present invention.

Claims

1. A frequency converter heat dissipation structure, characterized in that: include: A first heat sink (1) is used to dissipate heat from a rectifier module (3) of the frequency converter; A second heat sink (2) is used to dissipate heat from an inverter module (4) of the frequency converter; The first heat sink (1) has a first heat dissipation duct (100), the second heat sink (2) has a second heat dissipation duct (200), and the inverter heat dissipation structure further comprises a connecting duct (10) connecting the first heat dissipation duct (100) and the second heat dissipation duct (200), wherein the connecting duct (10) is used to accommodate at least a part of the capacitor module (7) of the inverter to dissipate heat from the capacitor module (7).

2. The inverter heat dissipation structure according to claim 1, characterized in that: The first heat dissipation air duct (100) has a first air outlet (101), and the second heat dissipation air duct (200) has a second air outlet (201); the first air outlet (101) and the second air outlet (201) are opposite to each other, and there is a gap between them; wherein the inverter heat dissipation structure forms the connecting air duct (10) at the gap.

3. The inverter heat dissipation structure according to claim 2, characterized in that: The first heat sink (1) comprises first heat dissipation fins (12), the number of the first heat dissipation fins (12) being more than two and arranged in parallel and spaced apart from each other, a first heat dissipation channel being formed between each adjacent two first heat dissipation fins (12), each first heat dissipation channel cooperating to form the first heat dissipation air duct (100), and openings of each first heat dissipation channel located on the same side cooperating to form the first air outlet (101).

4. The inverter heat dissipation structure according to claim 3, characterized in that: The first heat sink (1) further comprises a first substrate (11), the first substrate (11) having a first a side (11a) and a second a side (11b) opposite to each other, each of the first heat dissipating fins (12) being arranged on the first substrate (11) and being located on the first a side (11a); wherein the first heat sink (1) is connected to the rectifier module (3) via the second a side (11b) to dissipate heat from the rectifier module (3).

5. The inverter heat dissipation structure according to any one of claims 2 to 4, characterized in that: The second heat sink (2) comprises second heat dissipation fins (22), the number of the second heat dissipation fins (22) being more than two and being arranged in parallel and spaced apart in sequence, a second heat dissipation channel being formed between each adjacent pair of the second heat dissipation fins (22), each second heat dissipation channel cooperating to form the second heat dissipation air duct (200), and openings of each second heat dissipation channel located on the same side cooperating to form the second air outlet (201).

6. The inverter heat dissipation structure according to claim 5, characterized in that: The second heat sink (2) further comprises a second substrate (21), the second substrate (21) having a first b side (21a) and a second b side (21b) opposite to each other, each of the second heat dissipating fins (22) being arranged on the second substrate (21) and being located on the first b side (21a); ​​wherein the second heat sink (2) is connected to the inverter module (4) via the second b side (21b) to dissipate heat for the inverter module (4).

7. The inverter heat dissipation structure according to any one of claims 2 to 4 and 6, characterized in that: It also includes a first connecting plate (8) and a second connecting plate (9), wherein the first connecting plate (8) and the second connecting plate (9) are located on opposite sides of the interval to form side walls on opposite sides of the connecting channel (10).

8. The inverter heat dissipation structure according to claim 7, characterized in that: The first connecting plate (8) is provided with a snap-in (81) for inserting the capacitor (31) of the capacitor module (7) into the connecting air duct (10), and the snap-in (81) is also used for snapping with the capacitor (31); the second connecting plate (9) is used for providing support for the capacitor (31) inserted into the connecting air duct (10).

9. The inverter heat dissipation structure according to claim 7, characterized in that: When the first heat sink (1) comprises first heat sink fins (12), the number of the first heat sink fins (12) is more than two and they are arranged in parallel and spaced apart from each other, and the second heat sink (2) comprises second heat sink fins (22), the number of the second heat sink fins (22) is more than two and they are arranged in parallel and spaced apart from each other, The first heat dissipation fins (12) are arranged in sequence along the first direction (a) of the inverter heat dissipation structure, and the second heat dissipation fins (22) are also arranged in sequence along the first direction (a). The first connecting plate (8), the first radiator (1), the second connecting plate (9) and the second radiator (2) cooperate to enclose the connecting channel (10), and the connecting channel (10) has openings at both ends in the first direction (a).

10. A frequency converter, characterized in that: The invention comprises the inverter heat dissipation structure according to any one of claims 1 to 9.

11. The frequency converter according to claim 10, characterized in that: The rectifier module (3) is arranged on the first heat sink (1), the inverter module (4) is arranged on the second heat sink (2), and the capacitor module (7) is located between the rectifier module (3) and the inverter module (4); The frequency converter further comprises a circuit connector (5), the circuit connector (5) spanning the capacitor module (7), one end of the circuit connector (5) being electrically connected to the rectifier module (3), the other end of the circuit connector (5) being electrically connected to the inverter module (4), and the middle part of the circuit connector (5) being electrically connected to the capacitor module (7); wherein the circuit connector (5) is used to electrically connect the rectifier module (3), the capacitor module (7) and the inverter module (4), so that the output signal of the rectifier module (3) is filtered by the capacitor module (7) and then input to the inverter module (4).

12. The frequency converter according to claim 11, characterized in that: The circuit connection member (5) is a busbar, the busbar having a positive busbar (17) and a negative busbar (18), the busbar being electrically connected to the positive protrusion of the capacitor module (7) through the positive busbar (17), and being electrically connected to the negative protrusion of the capacitor module (7) through the negative busbar (18); The negative busbar (18) is closer to the capacitor module (7) than the positive busbar (17), a protrusion (171) is provided on the positive busbar (17), the positive busbar (17) is electrically connected to the positive protrusion of the capacitor module (7) via the protrusion (171), and a first avoidance hole (183) is provided on the negative busbar (18) for the protrusion (171) to pass through.

13. The frequency converter according to claim 12, characterized in that: The negative busbar (18) is provided with a bolt through hole (182), and a first bolt (20a) is used to pass through the bolt through hole (182) to fix the negative busbar (18) to the negative pole boss of the capacitor module (7); the positive busbar (17) is also provided with a second avoidance hole (172) for avoiding the first bolt (20a); And / or, the protrusion (171) is fixed to the positive pole protrusion of the capacitor module (7) via a second bolt (20b).

14. The frequency converter according to any one of claims 11 to 13, characterized in that: The other end of the circuit connector (5) has a pin (181), and the other end of the circuit connector (5) is electrically connected to the inverter module (4) via the pin (181), and the pin (181) is in close contact with the inverter module (4).

15. The frequency converter according to any one of claims 11 to 13, characterized in that: It also comprises an incoming line component (6), the incoming line component (6) spanning the capacitor module (7), one end of the incoming line component (6) being located on a side of the capacitor module (7) away from the rectifier module (3), the other end of the incoming line component (6) being located on a side of the capacitor module (7) close to the rectifier module (3), and the other end of the incoming line component (6) being electrically connected to the rectifier module (3), the incoming line component (6) introducing three-phase electricity through one end thereof, and introducing the three-phase electricity to the rectifier module (3) through the other end thereof; Wherein, the incoming line assembly (6) is located on a side of the circuit connector (5) facing away from the capacitor module (7).

16. An air compressor, characterized in that: The invention comprises the frequency converter according to any one of claims 10 to 15.

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