Frequency conversion control device and motor control system

Abstract

The embodiment of the utility model discloses frequency conversion control equipment and a motor control system. The frequency conversion control equipment comprises an outer shell, a containing shell, a first circuit board, a second circuit board and a heat dissipation piece. The outer shell comprises a mounting base and an outer side wall surrounding the mounting base, a first containing cavity and a second containing cavity are formed in the two sides of the mounting base respectively, and the containing shell and the heat dissipation piece are arranged on the mounting base and located in the second containing cavity. The first circuit board provided with the capacitor and the second circuit board provided with the power device are installed on the installation base and located in the first containing cavity, the capacitor extends into the containing shell, and the heat dissipation piece makes contact with the power device. Therefore, the frequency conversion control equipment can meet the heat dissipation and protection requirements through the separated accommodating cavities, the protection condition requirements on the use environment are reduced, and the service life is prolonged.

Description

Technical Field

[0001] The utility model relates to the technical field of motor drive, in particular to a frequency conversion control device and a motor control system. Background Art

[0002] With the development of agriculture, many barren hills have been transformed into orchards, but water pumps are needed to provide water during water shortage seasons. Permanent magnet high-speed energy-saving deep well water pumps have the advantages of high speed, small size, and light weight. They are particularly suitable for extracting groundwater for irrigation in orchards during dry seasons. High-speed deep well water pumps need to be matched with a frequency conversion control device to control the motor. Since orchards are in the wild and the protection conditions are poor, the usual frequency conversion control equipment is difficult to be waterproof and dustproof, and the heat dissipation performance is difficult to guarantee. For this reason, a frequency conversion control device with a high protection level is urgently needed to adapt to various use environments of the motor. Utility Model Content

[0003] In view of this, the purpose of the utility model is to provide a variable frequency control device and a motor control system, which protects and dissipates heat for the components between the outer shell and the cover body through the accommodating shell and the radiator arranged on the outer shell.

[0004] In a first aspect, an embodiment of the utility model provides a variable frequency control device, which comprises: an outer shell, which comprises a mounting seat and an outer side wall, wherein the outer side wall is arranged around the mounting seat to respectively form a first accommodating cavity and a second accommodating cavity on both sides of the mounting seat; a accommodating shell, which is arranged on the mounting seat and located in the second accommodating cavity; a first circuit board, which is mounted on the mounting seat and located in the first accommodating cavity, and a capacitor is arranged on the first circuit board, and the capacitor extends into the accommodating shell; a second circuit board, which is mounted on the mounting seat and located in the first accommodating cavity, and a power device is arranged on the second circuit board; and a heat sink, which is arranged on the mounting seat and located in the second accommodating cavity, and the heat sink is in contact with the power device.

[0005] In some embodiments, the frequency conversion control device also includes: a cover body, which is connected to the outer wall to close the first accommodating cavity; wherein a first through hole and a second through hole are provided on the mounting seat, the accommodating shell includes a bottom plate and a cylindrical wall formed by extending from the edge of the bottom plate toward the cover body, the cylindrical wall is connected to the edge of the first through hole to close the first through hole, the capacitor extends into the accommodating shell through the first through hole, and the heat sink closes the second through hole.

[0006] In some embodiments, the cylinder wall is a metal cylinder wall, and the bottom plate is a metal bottom plate.

[0007] In some embodiments, the cylinder wall is a plastic cylinder wall, and the bottom plate is a metal bottom plate.

[0008] In some embodiments, the cylinder wall is a plastic cylinder wall, and the bottom plate is a plastic bottom plate.

[0009] In some embodiments, a silicone sheet is provided between the capacitor and the bottom plate.

[0010] In some embodiments, the heat sink includes: a substrate enclosing the second through hole; and a plurality of heat dissipation fins extending from the substrate in a direction away from the cover.

[0011] In some embodiments, the outer side wall is provided with a sealing groove toward the cover body; the cover body is provided with a protrusion toward the outer shell, and the protrusion extends into the sealing groove; and a sealing ring is provided between the protrusion and the sealing groove.

[0012] In some embodiments, the containing shell is integrally formed with the outer shell.

[0013] In some embodiments, the heat sink is integrally formed with the outer shell.

[0014] In some embodiments, the frequency conversion control device also includes: a cooling fan, which is arranged in the second accommodating cavity, and the air outlet of the cooling fan is facing the heat sink and the accommodating shell; wherein, a first interface is provided on the mounting seat, and the cooling fan is electrically connected to the second circuit board through the first interface, and a sealant is provided in the first interface.

[0015] In some embodiments, an air inlet channel and an air outlet channel connected to the second accommodating cavity are provided on the outer side wall, and the air inlet channel and the air outlet channel are aligned with the cooling fan.

[0016] In some embodiments, a second interface communicating with the first accommodating cavity is provided on the outer side wall.

[0017] In some embodiments, the power device and the heat sink are stacked on the second circuit board.

[0018] In some embodiments, the first circuit board and the second circuit board are configured as the same circuit board.

[0019] In a second aspect, an embodiment of the utility model further provides a motor control system, which includes: a motor; and a frequency conversion control device as described in the first aspect, wherein the frequency conversion control device is configured to control the motor.

[0020] The embodiment of the utility model provides a frequency conversion control device and a motor control system, the frequency conversion control device includes an outer shell, a housing, a first circuit board, a second circuit board and a heat sink. The outer shell includes a mounting seat and an outer side wall surrounding the mounting seat, and a first housing cavity and a second housing cavity are formed on both sides of the mounting seat, respectively. The housing shell and the heat sink are arranged on the mounting seat and located in the second housing cavity. A first circuit board with a capacitor and a second circuit board with a power device are installed on the mounting seat and located in the first housing cavity. The capacitor extends into the housing shell, and the heat sink contacts the power device. As a result, the frequency conversion control device can meet the heat dissipation and protection requirements through the separated housing cavity, reduce the protection condition requirements for the use environment, and increase the service life. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The above and other purposes, features and advantages of the present invention will become more apparent through the following description of the embodiments of the present invention with reference to the accompanying drawings, in which:

[0022] Figure 1 It is an exploded schematic diagram of a frequency conversion control device provided by an embodiment of the utility model;

[0023] Figure 2 It is an exploded schematic diagram of another perspective of a frequency conversion control device provided by an embodiment of the utility model;

[0024] Figure 3 This is a schematic diagram of the structure of a containment shell provided by an embodiment of the utility model;

[0025] Figure 4 It is an exploded schematic diagram of another frequency conversion control device provided by an embodiment of the utility model;

[0026] Figure 5 It is an exploded schematic diagram of another frequency conversion control device provided by an embodiment of the utility model from another perspective;

[0027] Figure 6 This is a schematic diagram of the installation position of another accommodating shell provided in an embodiment of the utility model;

[0028] Figure 7 It is a schematic diagram of the installation position of a heat sink provided in an embodiment of the utility model.

[0029] Description of reference numerals:

[0030] 1-outer shell; 11-mounting seat; 111-first through hole; 112-second through hole; 113-first interface; 12-outer wall; 121-air inlet channel; 122-air outlet channel; 123-second interface; 124-sealing groove; 13-first accommodating chamber; 14-second accommodating chamber; 2-cover; 21-protrusion; 3-accommodating shell; 31-bottom plate; 32-cylinder wall; 41-capacitor; 42-power device; 421-second positioning hole; 43-first circuit board; 44-second circuit board; 441-first positioning hole; 5-heat sink; 51-substrate; 52-heat sink fin; 53-screw hole; 6-silicone sheet; 7-cooling fan; 8-sealing ring; 9-fastening screw. DETAILED DESCRIPTION

[0031] The present application is described below based on embodiments, but the present application is not limited to these embodiments. In the detailed description of the present application below, some specific details are described in detail. It is possible for those skilled in the art to fully understand the present application without the description of these details. In order to avoid confusing the essence of the present application, known methods, processes, flows, components and circuits are not described in detail.

[0032] In addition, persons of ordinary skill in the art will appreciate that the drawings provided herein are for illustration purposes and are not necessarily drawn to scale.

[0033] Unless otherwise clearly defined and specified, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0034] For ease of explanation, spatially relative terms such as "inside", "outside", "below", "below", "lower", "above", "upper", etc. are used herein to describe the relationship of one element or feature illustrated in the figures to another element or feature. It will be understood that spatially relative terms may be intended to include different orientations of the device in use or operation other than the orientation depicted in the figures. For example, if the device in the figure is turned over, an element described as being "below" or "below" other elements or features will then be positioned as being "above" the other elements or features. Thus, the example term "below" can include both the orientations of above and below. The device may be oriented in other ways (rotated 90 degrees or in other orientations), and the spatially relative descriptors used herein should be interpreted accordingly.

[0035] Unless the context clearly requires otherwise, the words "include", "comprising" and similar words throughout the application should be interpreted as including rather than exclusive or exhaustive; that is, the meaning is "including but not limited to".

[0036] In the description of this application, it should be understood that the terms "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying relative importance. In addition, in the description of this application, unless otherwise specified, the meaning of "plurality" is two or more.

[0037] Figure 1 It is an exploded schematic diagram of a frequency conversion control device provided by an embodiment of the utility model. Figure 2 This is an exploded schematic diagram of another perspective of a frequency conversion control device provided by an embodiment of the utility model, combined with Figure 1 and Figure 2 As shown, the frequency conversion control device includes an outer shell 1, a cover 2, a housing 3, a first circuit board 43, a second circuit board 44 and a heat sink 5. Specifically, the outer shell 1 includes a mounting seat 11 and an outer side wall 12 arranged around the mounting seat 11, that is, the mounting seat 11 is extended from the edge toward two opposite directions to form the outer side wall 12, and the area surrounded by the outer side wall 12 is divided into a first accommodation cavity 13 and a second accommodation cavity 14 by the mounting seat 11, that is, the outer shell 1 is formed with a first accommodation cavity 13 and a second accommodation cavity 14 on both sides of the mounting seat 11. Further, the first circuit board 43 and the second circuit board 44 are mounted on the mounting seat 11 and are located in the first accommodation cavity 13, and the housing 3 and the heat sink 5 are arranged on the mounting seat 11 and are located in the second accommodation cavity 14. Optionally, the first circuit board 43 and the second circuit board 44 are fixed to the mounting seat 11 by fasteners such as screws. Furthermore, a capacitor 41 is provided on the first circuit board 43, a power device 42 is provided on the second circuit board 44, the capacitor 41 extends into the housing 3, and the heat sink 5 contacts the power device 42. Thus, the frequency conversion control device separates the outer shell 1 into the first housing cavity 13 and the second housing cavity 14, and can achieve heat dissipation of the capacitor 41 and the power device 42 in the second housing cavity 14 through the housing 3 and the heat sink 5, and at the same time helps to seal the first housing cavity 13 to protect the devices therein.

[0038] In one embodiment, the frequency conversion control device further includes a cover body 2, which is configured to connect the outer side wall 12 to close the first accommodating chamber 13. Further, the mounting seat 11 is provided with a first through hole 111 and a second through hole 112, the accommodating shell 3 closes the first through hole 111, and the heat sink 5 closes the second through hole 112. Thus, the outer shell 1, the cover body 2, the accommodating shell 3 and the heat sink 5 form a completely closed first accommodating chamber 13, so that the components in the first accommodating chamber 13 can be effectively protected, thereby preventing the frequency conversion control device from leaking into impurities such as soil, dust, and water when it is in a relatively harsh working environment and affecting the normal operation of the frequency conversion control device. It should be noted that the capacitor 41 is an electrolytic capacitor, which plays the role of smoothing DC voltage, filtering, energy storage, voltage stabilization and isolation, so as to ensure that the frequency conversion control device can work normally and stably. Further, the accommodating shell 3 includes a bottom plate 31 and a barrel wall 32 formed by the edge of the bottom plate 31 extending toward the cover body 2, and the barrel wall 32 is connected to the edge of the first through hole 111 to close the first through hole 111. Thus, while the containing shell 3 closes the first through hole 111, the capacitor 41 can extend into the containing shell 3 through the first through hole 111, so that heat can be dissipated through the containing shell 3. At the same time, the heat sink 5 can contact the power device 42 through the second through hole 112, so as to achieve the heat dissipation function for the power device 42. Thus, the containing shell 3 and the heat sink 5 can not only play a heat dissipation role, but also cooperate with the outer shell 1 and the cover 2 to seal and protect the device in the first containing cavity 13.

[0039] In one embodiment, the first circuit board 43 and the second circuit board 44 are two different circuit boards, so that the positions of the first circuit board 43 and the second circuit board 44 can be adjusted according to installation requirements. As an optional embodiment, the first circuit board 43 and the second circuit board 44 can also be set as the same circuit board, and the capacitor 41 and the power device 42 are both set on the circuit board.

[0040] In one embodiment, the housing 3 and the outer housing 1 are integrally formed. Figure 3 This is a schematic diagram of a structure of a container provided by an embodiment of the utility model, combined with Figures 1 to 3As shown, the outer shell 1 and the cylinder wall 32 are made of plastic, and the bottom plate 31 is an embedded metal part that is integrally formed by injection molding. That is, the cylinder wall 32 is a plastic cylinder wall, and the bottom plate 31 is a metal bottom plate made of metal material. Therefore, under the premise of ensuring the heat dissipation effect of the containment shell 3 on the capacitor 41, it is possible to ensure that the bottom plate 31 and the cylinder wall 32, and the cylinder wall 32 and the outer shell 1 are tightly connected to prevent impurities from entering the first accommodating chamber 13, and to reduce the material cost of the frequency conversion control device to a certain extent. Optionally, the cylinder wall 32 is a metal cylinder wall made of metal material, and the bottom plate 31 is a plastic bottom plate, which can also make the containment shell 3 and the outer shell 1 tightly connected by integral molding to prevent impurities from entering the first accommodating chamber 13.

[0041] Figure 4 is an exploded schematic diagram of another frequency conversion control device provided by an embodiment of the utility model, Figure 5 is an exploded schematic diagram of another frequency conversion control device provided by an embodiment of the utility model from another perspective, Figure 6 This is a schematic diagram of the installation position of another housing shell provided by the embodiment of the utility model, combined with Figures 4 to 6 As shown, as an optional embodiment, the cylinder wall 32 is a metal cylinder wall, and the bottom plate 31 is a metal bottom plate. That is, the containment shell 3 is a metal part that is integrally formed by die-casting. Furthermore, the outer shell 1 is made of plastic, and the containment shell 3 is integrally formed by injection molding as an embedded metal part. Thereby, the heat dissipation effect of the containment shell 3 on the capacitor 41 is improved, and on the premise of ensuring the heat dissipation effect of the containment shell 3 on the capacitor 41, the close connection between the containment shell 3 and the outer shell 1 can be ensured, thereby preventing impurities from entering the first containment cavity 13. Optionally, the cylinder wall 32 is a plastic cylinder wall, and the bottom plate 31 is a plastic bottom plate, that is, the containment shell 3 and the outer shell 1 are directly injection molded, which can also make the containment shell 3 and the outer shell 1 tightly connected to prevent impurities from entering the first containment cavity 13.

[0042] like Figure 1 , Figure 2 , Figure 4 and Figure 5 As shown, in one embodiment, a silicone sheet 6 is provided between the capacitor 41 and the bottom plate 31, that is, the capacitor 41 contacts the bottom plate 31 through the silicone sheet 6. As a result, the silicone sheet 6 plays the role of intermediate transition heat conduction between the top of the capacitor 41 and the bottom plate 31, and transfers the heat of the capacitor 41 to the bottom plate 31 through the silicone sheet 6, so as to achieve the heat dissipation function of the housing shell 3. It should be noted that the capacitor 41 has the characteristics of thermal expansion and contraction, and the soft silicone sheet 6 can play a good elastic self-adaptive role, thereby ensuring close contact between the capacitor 41, the silicone sheet 6 and the bottom plate 31. On the other hand, corresponding to the bottom plate 31 being a metal bottom plate, the silicone sheet 6 can play an isolating role to prevent the capacitor 41 from directly contacting the bottom plate 31.

[0043] Figure 7 Schematic diagram of the installation position of a heat sink provided by an embodiment of the utility model, such as Figure 7 As shown, in one embodiment, the heat sink 5 is integrally formed with the outer shell 1. It should be noted that the heat sink 5 is die-casted from a metal material such as copper or aluminum. Furthermore, the outer shell 1 is made of plastic, and the heat sink 5 is integrally formed as an embedded metal part by injection molding. Thus, under the premise of ensuring the heat dissipation effect of the heat sink 5 on the power device 42, the close connection between the heat sink 5 and the outer shell 1 can be ensured to prevent impurities from entering the first accommodating cavity 13.

[0044] like Figure 7 As shown, in one embodiment, the heat sink 5 includes a substrate 51 and a plurality of heat sink fins 52. It is easy to understand that the heat sink 5 closes the second through hole 112 through the substrate 51, and contacts the power device 42 through the second through hole 112. Further, the heat sink fins 52 extend from the substrate 51 in a direction away from the cover 2, thereby extending into the second accommodation cavity 14 for heat dissipation. Therefore, the heat sink 5 can improve the heat dissipation effect of the power device 42 through the multi-layer heat sink fins 52.

[0045] like Figure 1 and Figure 4 As shown, in one embodiment, the frequency conversion control device also includes a heat dissipation fan 7. Specifically, the heat dissipation fan 7 is arranged in the second accommodating chamber 14, and the air outlet of the heat dissipation fan 7 faces the heat sink 5 and the accommodating shell 3, that is, the heat dissipation fan 7 is arranged on the side of the second accommodating chamber 14 close to the heat dissipation element 5. As a result, the heat dissipation fan 7 can first blow the heat dissipation element 5, and then blow to the accommodating shell 3, thereby taking away the heat. As an optional embodiment, the heat dissipation fan 7 can also be arranged on the side of the second accommodating chamber 14 close to the accommodating shell 3, so that the heat dissipation fan 7 can first blow the accommodating shell 3, and then blow to the heat dissipation element 5, thereby taking away the heat. Further, as Figure 1 and Figure 4 As shown, in this embodiment, the mounting base 11 is provided with a first interface 113. It is easy to understand that the connection line of the cooling fan 7 passes through the first interface 113, thereby achieving electrical connection with the second circuit board 44 through the first interface 113. Furthermore, a sealant is provided in the first interface 113, thereby playing a role in waterproofing and dustproofing.

[0046] Combination Figure 1 , Figure 2 , Figure 4 and Figure 5As shown, in one embodiment, an air inlet channel 121 and an air outlet channel 122 connected to the second accommodating chamber 14 are provided on the outer side wall 12. It is easy to understand that the air inlet channel 121 and the air outlet channel 122 are not connected to the first accommodating chamber 13 to meet the sealing requirements of the first accommodating chamber 13. Further, the air inlet channel 121 and the air outlet channel 122 are aligned with the heat dissipation fan 7. In other words, the air inlet channel 121 is aligned with the air inlet of the heat dissipation fan 7, and the air outlet channel 122 is aligned with the air outlet of the heat dissipation fan 7. Therefore, by providing the air inlet channel 121 and the air outlet channel 122, the heat dissipation fan 7 can bring the heat of the heat sink 5 and the accommodating shell 3 out of the outer shell 1, thereby realizing the heat dissipation function of the frequency conversion control device.

[0047] like Figure 2 and Figure 5 As shown, in one embodiment, a second interface 123 connected to the first accommodating cavity 13 is provided on the outer side wall 12. It should be noted that the number of the second interfaces 123 can be set as needed. Thus, the second circuit board 44 can be electrically connected to the external power supply and the motor to be controlled through the second interface 123. It is easy to understand that a sealant is provided in the second interface 123, so as to play a role of waterproof and dustproof. It should be further explained that the second interface 123 is arranged on a side close to the heat sink 5. On the one hand, it can effectively prevent water and dust while ensuring the connection strength, and on the other hand, it also helps to improve the heat dissipation effect of the heat sink 5.

[0048] like Figure 2 and Figure 5As shown, in one embodiment, the outer side wall 12 is provided with a sealing groove 124 toward the cover body 2, that is, the end face of the outer side wall 12 is provided with an annular sealing groove 124. Correspondingly, the cover body 2 is provided with a protrusion 21 toward the outer shell 1. It is easy to understand that the protrusion 21 is arranged in an annular shape and matches the sealing groove 124 so that the protrusion 21 extends into the sealing groove 124. Further, a sealing ring 8 is arranged between the protrusion 21 and the sealing groove 124, and the sealing ring 8 and the sealing groove 124 match each other. In other words, the sealing ring 8 can be arranged in the sealing groove 124, and the protrusion 21 can cooperate with the sealing groove 124 to resist the sealing ring 8 when extending into the sealing groove 124. Thus, the sealing groove 124, the sealing ring 8, and the protrusion 21 can play a sealing role when the cover body 2 is connected to the outer shell 1. In this embodiment, the cover body 2 is fixedly connected to the outer shell 1 by fastening screws 9. It is easy to understand that a plurality of fastening screws 9 are arranged in the peripheral area of ​​the sealing ring 8 to ensure that the sealing ring 8 can play a good waterproof and dustproof effect when the cover body 2 is connected to the outer shell 1. In the present embodiment, corresponding to the overall rectangular shape of the frequency conversion control device, four fastening screws 9 are provided, and the four corner areas of the cover body 2 are respectively connected to the four corner areas of the outer wall 12. It is easy to understand that the number and position of the fastening screws 9 can be set according to actual needs. It should be noted that in the present embodiment, the fastening screws 9 are used to connect the cover body 2 and the outer shell 1 by threaded connection, which is helpful for the subsequent disassembly and maintenance of the frequency conversion control device. Optionally, the cover body 2 and the outer shell 1 can also be connected by welding, pin connection, etc.

[0049] In one embodiment, the power device 42 and the heat sink 5 are stacked on the second circuit board 44. The power device 42 is fixedly arranged on the second circuit board 44, and the heat sink 5 is covered on the power device 42 and is threadedly connected with a group of screws to achieve fixed arrangement on the second circuit board 44, and at the same time achieve contact with the power device 42, so as to dissipate heat for the power device 42. Specifically, a plurality of first positioning holes 441 are provided on the second circuit board 44, a plurality of second positioning holes 421 are provided on the power device 42, and a plurality of screw holes 53 are provided on the heat sink 5, and the screw holes 53 correspond to the first positioning holes 441 and the second positioning holes 421 one by one, and the screws pass through the first positioning holes 441 on the second circuit board 44, the second positioning holes 421 on the power device 42, and the screw holes 53 on the heat sink 5 in sequence, so as to achieve the installation of the power device 42 and the heat sink 5. Optionally, there are five first positioning holes 441, five second positioning holes 421, and five screw holes 53, respectively.

[0050] The frequency conversion control device provided by the embodiment of the utility model dissipates heat for the capacitor 41 and the power device 42 through the containing shell 3 and the heat sink 5, and at the same time, the containing shell 3 and the heat sink 5 cooperate with the outer shell 1 and the cover 2 to seal and protect the devices in the first containing cavity 13. The structure is an integrated molding structure, which solves the sealing problem between the containing shell 3 and the heat sink 5 and the outer shell 1, and has the advantages of easy production, easy use, high protection level, good control reliability, etc., and can be applied to various equipment that require frequency conversion control.

[0051] The embodiment of the utility model also provides a motor control system. Furthermore, the motor control system includes a motor and a frequency conversion control device, and the motor can make a water pump or other device that requires a motor drive work. It should be further explained that the specific structure of the frequency conversion control device is as described above and will not be repeated here. In this embodiment, the frequency conversion control device is used to perform frequency conversion and speed regulation on the motor, thereby achieving the function of energy saving and efficiency improvement. Therefore, the motor control system reduces the requirements for the protection conditions of the use environment and enhances the service life by providing a frequency conversion control device with heat dissipation and waterproof and dustproof functions. At the same time, the outer shell 1 of the frequency conversion control device is made of plastic, which is cheap and non-conductive, so as to avoid leakage and damage to the user.

[0052] The embodiment of the utility model provides a frequency conversion control device and a motor control system, the frequency conversion control device includes an outer shell, a housing, a first circuit board, a second circuit board and a heat sink. The outer shell includes a mounting seat and an outer side wall surrounding the mounting seat, and a first housing cavity and a second housing cavity are formed on both sides of the mounting seat, respectively. The housing shell and the heat sink are arranged on the mounting seat and located in the second housing cavity. The first circuit board provided with a capacitor and the second circuit board provided with a power device are installed on the mounting seat and located in the first housing cavity. The capacitor extends into the housing shell, and the heat sink contacts the power device. Thus, the frequency conversion control device can meet the heat dissipation and protection requirements through the separated housing cavity, reduce the protection condition requirements for the use environment, and increase the service life. The above description is only a preferred embodiment of the present application, and is not intended to limit the present application. For those skilled in the art, the present application may have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A frequency conversion control device, characterized in that: The frequency conversion control device comprises: An outer shell, the outer shell comprising a mounting seat and an outer side wall, the outer side wall being arranged around the mounting seat to form a first accommodating cavity and a second accommodating cavity on two sides of the mounting seat respectively; a containing shell, the containing shell being arranged on the mounting seat and being located in the second containing cavity; a first circuit board, the first circuit board is mounted on the mounting seat and is located in the first accommodating cavity, a capacitor is provided on the first circuit board, and the capacitor extends into the accommodating shell; a second circuit board, the second circuit board is mounted on the mounting seat and located in the first accommodating cavity, and a power device is provided on the second circuit board; and A heat sink is arranged on the mounting seat and located in the second accommodation cavity, and the heat sink is in contact with the power device.

2. The frequency conversion control device according to claim 1, characterized in that: The frequency conversion control device also includes: A cover body, the cover body being connected to the outer side wall to close the first accommodating cavity; Wherein, the mounting seat is provided with a first through hole and a second through hole, the accommodating shell includes a bottom plate and a tube wall formed by extending from the edge of the bottom plate toward the cover body, the tube wall is connected to the edge of the first through hole to close the first through hole, the capacitor extends into the accommodating shell through the first through hole, and the heat sink closes the second through hole.

3. The frequency conversion control device according to claim 2, characterized in that: The cylinder wall is a metal cylinder wall, and the bottom plate is a metal bottom plate.

4. The frequency conversion control device according to claim 2, characterized in that: The cylinder wall is a plastic cylinder wall, and the bottom plate is a metal bottom plate.

5. The frequency conversion control device according to claim 2, characterized in that: The cylinder wall is a plastic cylinder wall, and the bottom plate is a plastic bottom plate.

6. The frequency conversion control device according to claim 3, 4 or 5, characterized in that: A silicone sheet is arranged between the capacitor and the bottom plate.

7. The frequency conversion control device according to claim 2, characterized in that: The heat sink comprises: a substrate that closes the second through hole; and A plurality of heat dissipation fins extend from the base plate toward a direction away from the cover body.

8. The frequency conversion control device according to claim 2, characterized in that: The outer side wall is provided with a sealing groove toward the cover body; The cover body is provided with a protrusion toward the outer shell, and the protrusion extends into the sealing groove; A sealing ring is provided between the protrusion and the sealing groove.

9. The frequency conversion control device according to claim 1, characterized in that: The accommodating shell and the outer shell are integrally formed.

10. The frequency conversion control device according to claim 1, characterized in that: The heat sink and the outer shell are integrally formed.

11. The frequency conversion control device according to claim 1, characterized in that: The frequency conversion control device also includes: a heat dissipation fan, the heat dissipation fan being disposed in the second accommodating chamber, and an air outlet of the heat dissipation fan being directed toward the heat dissipation element and the accommodating shell; Wherein, a first interface is provided on the mounting seat, the heat dissipation fan is electrically connected to the second circuit board via the first interface, and a sealant is provided in the first interface.

12. The frequency conversion control device according to claim 11, characterized in that: An air inlet channel and an air outlet channel connected to the second accommodating cavity are provided on the outer side wall, and the air inlet channel and the air outlet channel are aligned with the heat dissipation fan.

13. The frequency conversion control device according to claim 1, characterized in that: The outer side wall is provided with a second interface communicating with the first accommodating cavity.

14. The frequency conversion control device according to claim 1, characterized in that: The power device and the heat sink are stacked on the second circuit board.

15. The frequency conversion control device according to claim 1, characterized in that: The first circuit board and the second circuit board are configured as the same circuit board.

16. A motor control system, characterized in that: The motor control system comprises: Motors; and The frequency conversion control device according to any one of claims 1 to 15, wherein the frequency conversion control device is configured to control the motor.

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