CN218416165U - Frequency converter - Google Patents

Abstract

The application provides a frequency converter, includes: the power board and the driving board are arranged in the shell; the power board comprises a power substrate and a power module arranged on one side of the power substrate; the driving board comprises a driving substrate and a driving circuit arranged on the driving substrate, and the driving circuit is connected with the power module and is used for driving the power module to work; the housing includes a rear sidewall; the orthographic projections of the driving plate and the power plate on the rear side wall of the shell are overlapped along the width direction of the shell. The power board is divided into the power board and the driving board, the power board and the driving board are staggered in the shell, the width space inside the shell of the frequency converter is reduced, and the problem that the shell of the existing frequency converter is wide is effectively solved.

Description

Frequency converter

Technical Field

The application relates to the technical field of frequency conversion, in particular to a frequency converter.

Background

The frequency converter is an electric control device which applies a frequency conversion technology and a microelectronic technology and controls an alternating current motor by changing the frequency of a working power supply of the motor. The frequency converter mainly comprises a main circuit, a control circuit, a wiring terminal and a control keyboard. In the related art, a frequency converter is provided, in which components such as a power module and a driving circuit in a main circuit are integrated on a main circuit board (also called as a power board), and components such as a chip and a control circuit are integrated on a control board, so as to realize frequency conversion and speed regulation.

This kind of converter among the correlation technique, power board and control panel setting are in the casing, because control panel and power board adopt the design of flattening usually to lead to the power board width great, cause the casing width of converter to be wider, this converter installation need occupy great area in the switch board like this, especially when needs many this converters place side by side in the limited switch board of installation space like this, can cause very big inconvenience to user's use experience has been reduced.

SUMMERY OF THE UTILITY MODEL

The embodiment of the application provides a frequency converter, which is used for solving the problem of wider shell of the frequency converter.

The embodiment of the application provides a frequency converter, which comprises a shell, a power board and a driving board, wherein the power board and the driving board are arranged in the shell; the power board comprises a power substrate and a power module arranged on one side of the power substrate; the driving board comprises a driving substrate and a driving circuit arranged on the driving substrate, and the driving circuit is connected with the power module and is used for driving the power module to work; the casing includes the rear wall, along the width direction of casing, the orthographic projection of drive plate and power board on the rear wall overlaps.

In some embodiments, the driving substrate is disposed perpendicular to the power substrate.

In some embodiments, the driving substrate is disposed at one side edge of the power substrate in a width W direction of the case.

In some embodiments, the driving board further includes a component disposed on the driving substrate, and the driving substrate and the component are both located on a side of the power substrate away from the rear sidewall; the power board further comprises a bus capacitor arranged on the power substrate, and the bus capacitor is located between the power substrate and the rear side wall.

In some embodiments, the frequency converter further comprises a capacitor sheath, and the capacitor sheath is sleeved on the bus capacitor.

In some embodiments, the frequency converter further comprises a filter plate disposed on a side of the power substrate away from the rear sidewall.

In some embodiments, the frequency converter further includes a control board, the control board includes a control substrate and a control chip disposed on the control substrate, and the control chip is connected to the driving circuit and located on a side of the driving board away from the power substrate.

In some embodiments, the frequency converter further includes an option card electrically connected to the control chip and located on a side of the control substrate away from the rear sidewall.

In some embodiments, the number of the option cards is multiple, the multiple option cards are arranged along the height direction of the housing, and the multiple option cards are arranged in a step shape relative to the control substrate.

In some embodiments, the housing comprises a front shell, a rear shell, and a middle shell connected between the front shell and the rear shell; the rear shell comprises a rear side wall, a first partition wall and a rear shell side wall connecting the rear side wall and the first partition wall, and a first space is formed among the first partition wall, the rear shell side wall and the rear side wall; the middle shell comprises a second partition wall and a middle shell side wall arranged at the edge of the second partition wall, the middle shell side wall is detachably connected with the rear shell side wall, and a second space is formed among the second partition wall, the middle shell side wall and the first partition wall; the front shell comprises a front side wall and a front shell side wall arranged at the edge of the front side wall, the front shell side wall is detachably connected with the middle shell side wall, and a third space is formed among the second partition wall, the front shell side wall and the front side wall of the shell; the power substrate and the driving board are located in the second space, a module avoiding opening is formed in the first partition wall, and the power module extends into the first space through the module avoiding opening.

In some embodiments, the frequency converter further includes a dc reactor disposed in the first space, a third wire through hole is opened in the first partition wall, and a connection line of the dc reactor is electrically connected to the power board through the third wire through hole.

In some embodiments, the frequency converter further comprises a heat sink in thermally conductive connection with the power module, the heat sink being located within the first space.

In some embodiments, the inverter further comprises a first fan and/or a second fan; the first fan is arranged in the first space, and the second fan is arranged in the second space; the drive board further comprises a fan control circuit arranged on the drive substrate, and the first fan and the second fan are electrically connected with the fan control circuit.

In some embodiments, the inverter further includes a gasket filled in a gap between the heat sink and the first partition wall.

In some embodiments, a first ventilation opening is formed in the housing at a position corresponding to the first space, and a second ventilation opening is formed in the housing at a position corresponding to the second space; the frequency converter further comprises a protective film, wherein the protective film is attached to the shell and covers the first ventilation opening and/or the second ventilation opening.

In some embodiments, the frequency converter further comprises a first seal and a second seal; the first sealing element is arranged at the joint of the side wall of the rear shell and the side wall of the middle shell; the second sealing piece is arranged at the joint of the middle shell side wall and the rear shell side wall.

In some embodiments, the front case includes a first sub front case and a second sub front case arranged along a height direction of the case, and the first sub front case is detachably connected to the second sub front case; the frequency converter comprises an optional card electrically connected with the control chip, the control panel further comprises a first connecting terminal arranged on the control substrate, the first connecting terminal is arranged in the first sub front shell, and the control chip and the optional card are arranged in the second sub front shell.

In some embodiments, a second opening is formed at a lower end of the first sub front shell, and the first connection terminal is disposed at the second opening; the lower extreme of mesochite has first opening, the power board still including set up in second connecting terminal on the power base plate, second connecting terminal is located first opening part.

In some embodiments, the housing further protects the cover and the containment cap; the protective cover is detachably arranged at the lower end of the middle shell to cover the first opening, and a first wire passing hole is formed in the protective cover; the blocking cover is detachably connected to the lower end of the first sub front shell so as to block the second opening, and a second wire passing hole is formed in the blocking cover.

In some embodiments, the protective cover includes a cover top wall and a cover side wall disposed at an edge of the cover top wall, and the blocking cap is of unitary construction with the cover top wall.

In some embodiments, the frequency converter further comprises a third seal disposed at the junction of the protective cover and the first sub-front shell and the middle shell.

The utility model provides a converter, through setting up the power module on the power board among the correlation technique on the power board, set up drive circuit on the drive plate, orthographic projection width direction of power board and drive plate on the casing back side wall overlaps mutually, compare in setting up the casing on this board of power board with power board and drive plate integration, the casing width of converter has been reduced, when this converter is installed in the limited switch board in space, can save switch board installation space, thereby be favorable to the optimal layout of switch board.

Drawings

In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present application, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.

FIG. 1 is a physical block diagram of a frequency converter in some embodiments of the present application;

FIG. 2 is a diagram of the power board of FIG. 1;

FIG. 3 is a block diagram of the drive plate of FIG. 1;

FIG. 4 is a block diagram of the control panel and the option card of FIG. 1;

fig. 5 is a structural view of a filter plate in fig. 1;

fig. 6 is a schematic structural diagram of a frequency converter according to some embodiments of the present application;

fig. 7 is an exploded view of another perspective of a transducer according to some embodiments of the present application;

FIG. 8 is a cross-sectional view of a transducer from another perspective provided by some embodiments of the present application;

FIG. 9 is a partial block diagram of another view of a transducer according to some embodiments of the present application;

FIG. 10 is a partial block diagram of another view of a transducer according to some embodiments of the present application;

fig. 11 is a partial block diagram of another view of a transducer according to some embodiments of the present application;

FIG. 12 is a partial block diagram of another perspective of a transducer according to some embodiments of the present application;

fig. 13 is a schematic structural diagram of a frequency converter according to some embodiments of the present application;

FIG. 14 is an exploded view of another perspective of a transducer provided by some embodiments of the present application;

fig. 15 is a partially enlarged structural view of the frequency converter in fig. 8;

fig. 16 is an exploded view of a portion of the structure of the frequency converter of fig. 14;

fig. 17 is an assembly structure diagram of the frequency converter in fig. 14.

Reference numerals are as follows: 100. a housing; 1. a rear housing; 11. a rear sidewall; 111. a convex hull; 12. a first space; 13. A first partition wall; 131. a third wire passing hole; 132. a limiting structure; 133. supporting; 134. a bus capacitor hole; 135. the power module dodges the port; 14. a first air vent; 15. a first rib; 16. a square hole; 17. A fan cover plate; 2. a middle shell; 21. a second partition wall; 22. a second space; 23. a second ventilation opening; 24. a third signal terminal avoidance port; 26. a first opening; 27. a first groove; 28. a second convex rib; 3. a front housing; 31. A front side wall; 32. a third space; 33. a first sub front case; 34. a second sub front shell; 35. a control keyboard; 36. a second groove; 37. a second opening; 200. a power board; 201. a power substrate; 202. a power module; 203. a bus capacitor; 204. a metal stud; 205. a DC reactor connection terminal; 206. a buffer relay; 207. a first signal terminal; 208. a frequency converter output terminal; 209. a ground terminal; 210. a second connection terminal; 211. a capacitor sheath; 300. a drive plate; 301. a drive substrate; 302. a third signal terminal; 303. a transformer; 304. an indicator light; 305. a second signal terminal; 306. a first heat sink; 307. A fan wiring terminal; 308. a buffer transformer; 400. a control panel; 401. a control substrate; 402. a control chip; 403. a control board input/output terminal; 404. a relay output terminal; 405. 485 interface; 406. A fifth signal terminal; 407. a fourth signal terminal; 410. a first connection terminal; 500. a filter plate; 501. A filter substrate; 502. a frequency converter input terminal; 503. a filter plate ground terminal; 504. a voltage dependent resistor; 505. an absorption capacitance; 506. an inductance; 507. mounting holes; 600. selecting and matching cards; 601. selecting and matching a card substrate; 602. programming a port; 603. a communication port; 604. a seventh signal terminal; 605. a sixth signal terminal; 606. Selecting and matching a card chip; 700. a direct current reactor; 800. a second heat sink; 900. a first fan; 1000. a second fan; 1100. a gasket; 1200. a protective film; 1300. a first seal member; 1400. a second seal member; 1500. a protective cover; 1501. a first wire passing hole; 1502. a third groove; 1503. a fourth groove; 1600. Sealing the blocking cover; 1601. a second wire passing hole; 1700. a third seal.

Detailed Description

The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all of the embodiments. All other embodiments obtained by a person of ordinary skill in the art based on the embodiments in the present application without making any creative effort belong to the protection scope of the present application.

In the description of the present application, it is to be understood that the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience in describing the present application and simplifying the description, but do not indicate or imply that the referred device or element must have a particular orientation, be constructed in a particular orientation, and be operated, and thus should not be construed as limiting the present application.

In the description of the present application, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; the specific meaning of the above terms in this application will be understood to be a specific case for those of ordinary skill in the art.

The terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present application, "a plurality" means two or more unless otherwise specified.

As shown in fig. 1, a physical block diagram of a frequency converter in some embodiments of the present application. The frequency converter comprises a power board 200, a driving board 300 and a control board 400.

As shown in fig. 1 and 2, fig. 2 is a structural view of the power board of fig. 1. The power board 200 includes a power substrate 201, a power module 202, a bus capacitor 203, a metal stud 204, a dc reactor connection terminal 205, a buffer relay 206, a converter output terminal 208, a ground terminal 209, and a first signal terminal 207 connected to the drive board 300. The power module 202 realizes rectification and inversion in the main circuit of the frequency converter, and the buffer relay 206 is a switch of the main circuit and controls the on and off of the main circuit.

As shown in fig. 1 and 3, fig. 3 is a structural view of the driving plate of fig. 1. The driving board 300 comprises a driving substrate 301, a third signal terminal 302, a transformer 303, an indicator light 304, a second signal terminal 305, a first heat sink 306, a fan connection terminal 307 and a buffer transformer 308, which form a driving circuit, the driving circuit is used for driving the power module 202 on the power board 200 to work, and the driving board 300 is matched with the first signal terminal 207 on the power board 200 through the second signal terminal 305 to realize communication.

As shown in fig. 1 and 4, fig. 4 is a structural view of the control board and the option card of fig. 1. The control board 400 includes a control substrate 401, a control chip 402, a control board input-output terminal 403, a relay output terminal 404, a 485 interface 405, a fifth signal terminal 406, and a fourth signal terminal 407. The control board 400 is matched with the third signal terminal 302 on the driving board 300 through the fourth signal terminal 407 to realize communication, the control chip 402 controls the driving circuit on the driving board 300 to drive the power module 202 to act, and the control board 400 is connected with the control keyboard 35 through the 485 interface 405 to realize the control of the control keyboard 35 on the control board 400.

As shown in fig. 1 and 5, fig. 5 is a structural view of the filter plate of fig. 1. The frequency converter further comprises a filter plate 500. The filter board 500 includes a filter substrate 501, a converter input terminal 502, a filter board ground terminal 503, a voltage dependent resistor 504, an absorption capacitor 505, and an inductor 506, forming a lightning protection and filter circuit. The filter plate 500 is provided with a mounting hole 507 coated with copper foil, and the mounting hole is matched with the metal stud 204 arranged on the power board 200 to realize the electrical connection with the power board 200.

As shown in fig. 1 and 4, the frequency converter further includes an option card 600. The option card 600 includes an option card substrate 601, a programming port 602, a communication port 603, a seventh signal terminal 604, a sixth signal terminal 605, and an option card chip 606. The option card 600 is matched with the fourth signal terminal 407 on the control board 400 through the sixth signal terminal 605 to realize communication, and the user downloads the program to the option card chip 606 through the programming port 602 to realize expansion of the interface of the control board 400.

As shown in fig. 1 and fig. 6, fig. 6 is a schematic structural diagram of a frequency converter provided in some embodiments of the present application, and fig. 7 is an exploded view of the frequency converter provided in some embodiments of the present application from another perspective. The frequency converter comprises a shell 100, a power board 200 and a driving board 300 which are arranged in the shell 100; the power board 200 includes a power substrate 201 and a power module 202 disposed on one side of the power substrate 201; the driving board 300 includes a driving substrate 301 and a driving circuit disposed on the driving substrate 301, and the driving circuit is connected to the power module 202 and is configured to drive the power module 202 to operate; the case 100 includes a rear sidewall 11, and the power board 200 and the driving board 300 overlap in an orthographic projection on the rear sidewall 11 in the width W direction of the case 100. The power board 200 adopts a modular design, the power module 202 is arranged on the power substrate 201 to realize three-phase power rectification and inversion, the driving circuit is arranged on the driving board 300, and the driving circuit is connected with the power module 202 to drive the power module 202 to act. Compared with the case 100 in which the power board 200 and the driving board 300 are integrated on the board of the power board 200, the width of the case 100 of the frequency converter is reduced, and when the frequency converter is installed in a control cabinet with limited space, the installation space of the control cabinet can be saved, thereby being beneficial to the optimized layout of the control cabinet.

In some embodiments, as shown in fig. 7, fig. 7 is an exploded view of another perspective of a frequency converter provided by some embodiments of the present application. The driving substrate 301 is vertically disposed at one side edge of the power substrate 201 in the width W direction of the case 100. The driving substrate 301 and the components disposed on the driving substrate 301 are disposed on a side of the power substrate 201 away from the rear sidewall 11. Such an arrangement allows the orthographic projection of the driving board 300 on the rear side wall 11 in the width W direction of the housing 100 to be within the orthographic projection range of the power board 200, and reduces the increase in the width dimension of the power board 201 to avoid interference of components on the two boards caused by the vertical arrangement of the driving board 301 and the power board 201.

The drive substrate 301 may also be vertically disposed at an arbitrary position of the power substrate 201 in the width W direction of the housing 100. The driving substrate 301 and the components disposed on the driving substrate 301 may be disposed on one side between the power substrate 201 and the rear sidewall 11.

In some embodiments, as shown in fig. 7, the power module 202 is located between the power substrate 201 and the rear sidewall 11. Such an arrangement can avoid interference with components on the drive board 300. The power module 202 can be far away from the components on the driving board 300, and the interference with the components on the driving board 300 can be avoided.

In some embodiments, as shown in fig. 7, the frequency converter further includes a filter plate 500, and the filter plate 500 is disposed between the power substrate 201 and the control substrate 401, so as to reduce the loss of current passing through the main circuit.

In some embodiments, as shown in fig. 7, the frequency converter further includes a control board 400, where the control board 400 includes a control substrate 401 and a control chip 402 disposed on the control substrate 401, and the control chip 402 is connected to the driving circuit and is located on a side of the driving board 300 away from the power substrate 201. Such an arrangement facilitates communication between the control board 400 and the driver board 300.

In some embodiments, as shown in fig. 7, the frequency converter further includes an option card 600, the option card 600 is electrically connected to the control chip 402, and the option card 600 is disposed on a side of the control substrate 401 away from the rear sidewall 11.

The option card 600 is provided to expand the ports of the control board 400, and the option card 600 is provided on the side of the control board 401 away from the rear wall 11, so that the size of the frequency converter in the width direction is reduced compared to the case where the option card 600 is provided side by side with the control board 401.

In some embodiments, as shown in fig. 7, the number of the option cards 600 is multiple, the option cards 600 are arranged along the height H direction of the housing 100, and the option cards 600 are arranged in a step shape with respect to the control substrate 401. The size of the frequency converter in width or height is reduced compared to arranging a plurality of option cards 600 side by side or side by side.

The height H direction means a direction perpendicular to the inverter when the inverter is placed vertically as shown in fig. 6.

In some embodiments, as shown in fig. 7, the frequency converter further includes a dc reactor 700, and the dc reactor 700 is electrically connected to the power board 200 through a connection line. The direct current reactor 700 is detachably fixed on the rear side wall 11 and is positioned between the power substrate 201 and the rear side wall 11, the power substrate 201 is provided with a direct current reactor connecting terminal 205, a connecting line of the direct current reactor 700 is connected to the power board 200 through the direct current reactor connecting terminal 205, the continuous rectification current on the main circuit is kept, and the harmonic interference is reduced.

In some embodiments, as shown in fig. 7, the frequency converter further comprises a second heat sink 800 in heat conducting connection with the power module 202, the second heat sink 800 being located between the power substrate 201 and the rear side wall 11. The second heat sink 800 is fixedly connected to the power module 202 to achieve heat conduction. The second heat sink 800 has a relatively large volume, and is fixed between the power substrate 201 and the rear sidewall 11, so as to achieve heat dissipation for the power module 202, and simultaneously optimize the arrangement of components on the power substrate 201, and reduce the area of the power substrate 201.

It should be noted that the fixing connection may be fixed by a fastening screw, or may be realized by other fixing methods to conduct heat between the power module 202 and the second heat sink 800.

In some embodiments, as shown in fig. 7, a bus capacitor 203 is disposed on the power substrate 201, and the bus capacitor 203 is disposed on the power substrate 201 and between the power substrate 201 and the rear sidewall 11. Due to the arrangement, the distance between the power substrate 201 and the control substrate 401 can be reduced, the arrangement of components on the power substrate 201, the drive substrate 301 and the control substrate 401 is convenient, and the interference on the components on the drive board 300 and the control board 400 can be avoided.

In some embodiments, as shown in fig. 7, the frequency converter further includes a first fan 900, the first fan 900 is disposed between the power substrate 201 and the rear sidewall 11, the driving board 300 further includes a fan control circuit disposed on the driving substrate 301, and the first fan 900 is electrically connected to the fan control circuit. The first fan 900 is disposed between the power substrate 201 and the rear sidewall 11, and is configured to dissipate heat of components between the power substrate 201 and the rear sidewall 11.

In some embodiments, as shown in fig. 7 and 8, fig. 8 is a cross-sectional view of a transducer from another perspective provided by some embodiments of the present application. The case 100 includes a front case 3, a rear case 1, and a middle case 2 connected between the front case 3 and the rear case 1; the rear shell 1 comprises a rear side wall 11, a first partition wall 13 and a rear shell 1 side wall connecting the rear side wall 11 and the first partition wall 13, and a first space 12 is formed among the first partition wall 13, the rear shell 1 side wall and the rear side wall 11; the middle shell 2 comprises a second partition wall 21 and a side wall of the middle shell 2 arranged at the edge of the second partition wall 21, the side wall of the middle shell 2 is detachably connected with the side wall of the rear shell 1, and a second space 22 is formed among the second partition wall 21, the side wall of the middle shell 2 and the first partition wall 13; the front shell 3 comprises a front side wall 31 and a front shell 3 side wall arranged at the edge of the front side wall 31, the front shell 3 side wall is detachably connected with the middle shell 2 side wall, and a third space 32 is formed among the second partition wall 21, the front shell 3 side wall and the front side wall 31 of the shell 100; the power substrate 201 and the driving board 300 are located in the second space 22, the first partition wall 13 is provided with a power module avoiding opening 135, and the power module 202 extends into the first space 12 through the power module avoiding opening 135.

The rear side wall 11 is fixed on the side wall of the rear shell 1 through clamping, a plurality of convex hulls 111 are arranged on two sides of the rear side wall 11, and a square hole 16 is arranged at the position where the side wall of the rear shell 1 is matched with the side wall of the rear shell to seal the component in the first space 12; the side wall of the middle shell 2 is detachably connected with the side wall of the rear shell 1, so that components in the second space 22 are sealed; the side wall of the front shell 3 is detachably connected with the side wall of the middle shell 2, so that components in the third space 32 are covered.

As shown in fig. 9 and fig. 10, fig. 9 is a partial structural view of a frequency converter provided in some embodiments of the present application from another view, and fig. 10 is a partial structural view of a frequency converter provided in some embodiments of the present application from another view. The first partition wall 13 is provided with a support 133 and a limiting structure 132, the power board 200 is detachably fixed to the first partition wall 13 through the support 133, and the driving board 300 is detachably fixed to the first partition wall 13 through the limiting structure 132. The second heat sink 800 is detachably fixed to the first partition wall 13, is in heat-conducting connection with the power module 202, and is located in the first space 12.

As shown in fig. 9, the first partition 13 is provided with a bus capacitor hole 134 and a third wire passing hole 131, and the bus capacitor 203 is located in the first space 12 through the bus capacitor hole 134. The dc reactor 700 and the first fan 900 are located in the first space 12, and the connection lines of the dc reactor 700 and the connection lines of the first fan 900 are electrically connected to the power board 200 through the third wire passing hole 131.

Fig. 11 is a partial structural diagram of a frequency converter according to another view angle, as shown in fig. 11. A second signal terminal avoiding opening 24 is formed in the second partition wall 21, and the third signal terminal 302 of the driving board 300 and the fourth signal terminal 407 matched with the control board 400 realize connection communication through the third signal terminal avoiding opening 24.

In some embodiments, as shown in fig. 11, a first ventilation opening 14 is formed on the housing 100 at a position corresponding to the first space 12, and a second ventilation opening 23 is formed on the housing 100 at a position corresponding to the second space 22. The first ventilation opening 14 is used for heat dissipation of components in the first space 12, and the second ventilation opening 23 is used for heat dissipation of components in the second space 22.

Wherein, according to the heat dissipation requirement of components and parts in first space 12 of converter, can be in one side in the drain pan lateral wall, or open first vent 14 to many sides, according to the heat dissipation requirement of components and parts in second space 22 of converter, can be in one side in the lateral wall of mesochite 2, or open second vent 23 to many sides. The first ventilation opening 14 comprises a fan ventilation opening on the fan cover plate 15, and the second ventilation openings 23 are formed on two pairs of side walls of the middle shell 2.

In some embodiments, as shown in fig. 12, fig. 12 is a partial structural diagram of a frequency converter provided in some embodiments of the present application from another perspective. The housing 100 further includes a fixing member 4, the fixing member 4 is detachably connected to the middle case 2 and located in the third space 32 for fixing the control board 400 and the option cards 600, the control board 401 is fixed to the rear side of the fixing member 4, and the front side of the fixing member 4 is arranged in a step shape for fixing the plurality of option cards 600.

In some embodiments, as shown in fig. 13, fig. 13 is a schematic structural diagram of a frequency converter provided in some embodiments of the present application. The front shell 3 comprises a first sub front shell 33 and a second sub front shell 34 which are arranged along the height direction of the shell 100, and the first sub front shell 33 is detachably connected with the second sub front shell 34; the converter includes the option card 600 of being connected with control chip 402 electricity, and control panel 400 still includes the first connection terminal 410 that sets up on control substrate 401, and first connection terminal 410 sets up in first sub-front shell 33, and control chip 402 and option card 600 set up in second sub-front shell 34, in order to compromise the security and the stability of control chip 402 and option card 600 and the convenient wiring of first connection terminal 410. The first connection terminal 410 includes a controller input/output terminal 403 and a relay output terminal 404.

The connecting end sides of the first sub front shell 33 and the second sub front shell 34 are provided with corresponding concave-convex structures, so that the first sub front shell and the second sub front shell are partially overlapped and can be detachably connected to the middle shell 2; the control keyboard 35 is arranged on the second sub front shell 34 and is connected with the 485 interface 405 on the control panel 400 through a connecting line, so that communication is realized.

In some embodiments, as shown in fig. 13, the lower end of the first sub front shell 33 is opened with a second opening 37, and the first connection terminal 410 is disposed at the second opening 37; the middle case 2 has a first opening 26 at a lower end thereof, and the power board 200 further includes a second connection terminal 210 disposed on the power substrate 201, the second connection terminal 210 being located at the first opening 26.

The middle shell 2 comprises a third partition wall 25, the third partition wall 25 is perpendicular to the bottom side edge of the second partition wall 21, the second partition wall 21 is of an integral structure to form a second opening 37, the second opening is used for separating and exposing the second connecting terminal 210 and components on the control board 400, the filter board 500 and the drive board 300, safety and stability of the power board 200 and the drive board 300 are both considered, and wiring of the second connecting terminal 210 is facilitated. The second connection terminal 210 includes a converter input terminal 502, a converter output terminal 208, a converter ground terminal 209, and the like.

In some embodiments, as shown in fig. 14, fig. 14 is an exploded view of another transducer from another perspective as provided by some embodiments of the present application. The frequency converter further comprises a second fan 1000, the second fan 1000 is disposed in the second space 22, and the second fan 1000 is electrically connected to the fan control circuit. The second fan 1000 is detachably fixed on the first partition 13, and is located in the second space 22 for dissipating heat of components in the second space 22.

In some embodiments, as shown in fig. 14, the frequency converter further includes a capacitor cover 211, and the capacitor cover 211 is sleeved on the bus capacitor 203. The sealing device is used for sealing the gap between the bus capacitor 203 and the bus capacitor hole 134 on the first partition wall 13, and the dustproof and waterproof grade of the rear shell 1 is improved.

In some embodiments, as shown in fig. 14, the frequency converter further includes a sealing gasket 1100, and the sealing gasket 1100 is filled in a gap between the second heat sink 800 and the first partition wall 13 to seal the gap between the power module 202 at the opening 135 and the second heat sink 800 on the first partition wall 13, so as to improve the dust-proof and water-proof rating of the rear case 1.

Specifically, the gasket 1100 may be made of a material having heat conductive and sealing properties, such as Ethylene Vinyl Acetate Copolymer (EVA) foam, in which the EVA resin is an Ethylene Vinyl Acetate Copolymer having impact resistance, filler compatibility, and heat sealing properties.

In some embodiments, as shown in fig. 14, the frequency converter further includes a protective film 1200, and the protective film 1200 is attached to the housing 100 and covers the first ventilation opening 14 or the second ventilation opening 23, or covers the first ventilation opening 14 and the second ventilation opening 23. The dustproof and waterproof grades of the rear shell 1 and the middle shell 2 are improved.

The protective film 1200 may be a film such as a Polycarbonate (PC) film that is dustproof, waterproof, stable, and attachable.

The PC film is an amorphous, odorless, nontoxic, highly transparent colorless or yellowish thermoplastic engineering plastic, has the characteristics of low water absorption rate, low shrinkage rate, low creep property, high dimensional precision, good dimensional stability and low film air permeability, and can meet the requirements of dust prevention and water prevention.

In some embodiments, as shown in fig. 15, fig. 15 is a partial enlarged structural view of the frequency converter in fig. 8. The frequency converter further comprises a first seal 1300 and a second seal 1400; the first sealing piece 1300 is arranged at the joint of the side wall of the rear shell 1 and the side wall of the middle shell 2; the second sealing member 1400 is disposed at a joint of the side wall of the middle case 2 and the side wall of the front case 3, and is used for improving the dustproof and waterproof grade of the side wall of the housing 100.

The side wall of the rear shell 1 is provided with a first convex rib 15, the side wall of the middle shell 2 is provided with a first groove 27, the first convex rib 15 is matched with the first groove 27, and the first sealing element 1300 is a sealing strip and is arranged in the first groove 27; the lateral wall of the middle shell 2 is provided with a second convex rib 28, the lateral wall of the front shell 3 is provided with a second groove 36, the second convex rib 28 is matched with the second groove 36, and the second sealing element 1400 is a sealing strip and is arranged in the second groove 36. The first rib 15 and the first groove 27 can be arranged in an exchangeable manner, and the second rib 28 and the second groove 36 can be arranged in an exchangeable manner.

In some embodiments, as shown in fig. 16 and 17, fig. 16 is an exploded view of a portion of the structure of the frequency converter in fig. 14, and fig. 17 is an assembled structure diagram of the frequency converter in fig. 14. The casing 100 further comprises a protection cover 1500 and a blocking cover 1600, the protection cover 1500 is detachably covered on the lower end of the middle casing 2 to cover the first opening 26, and the protection cover 1500 is provided with a first wire passing hole 1501; the blocking cover 1600 is detachably connected to the lower end of the first sub front shell 33 to block the second opening 37, and a second wire passing hole 1601 is formed in the blocking cover 1600. The protection cover 1500 includes the cover roof wall and sets up in the cover lateral wall of cover roof wall edge, seals the structure as an organic whole of lid 1600 and cover roof wall for improve the dustproof and waterproof grade of casing 100 bottom.

The protection cover 1500 and the blocking cover 1600 can be connected together by screwing, clamping, inserting and the like, and can be determined according to actual conditions.

The first wire-passing hole 1501 and the second wire-passing hole 1601 enable a connecting wire on the first connecting terminal 410 and the second connecting terminal 210 to pass through, and the frequency converter further comprises a waterproof sealing retainer ring 1602 for covering the second wire-passing hole 1601.

In some embodiments, as shown in fig. 16, the frequency converter further includes a third sealing member 1700, and the third sealing member 1700 is disposed at the joint of the protection cover 1500 and the first sub front shell 33 and the middle shell 2, and is used for improving the dust-proof and water-proof grade of the bottom of the casing 100.

The protective cover 1500 is provided with a third groove 1502, the side wall of the middle shell 2 is matched with the third groove 1502, and a third sealing element 1700 is a sealing strip and is arranged in the third groove 1502;

the protective cover 1500 is provided with a fourth groove 1503, the blocking cover 1600 is detachably connected with the fourth groove 1503 in a matching manner, and the third sealing member 1700 is arranged in the fourth groove 1503.

The particular features, structures, materials, or characteristics may be combined in any suitable manner in any one or more embodiments or examples.

The frequency converter is generally placed in an electric control cabinet, the protection grade of the electric control cabinet is generally IP20 protection grade, the frequency converter can meet the requirement of at least IP20 protection grade, and the highest protection grade of IP55 can be reached after the frequency converters of multiple embodiments are combined.

It should be noted that the IP (Ingress Protection) Protection level system provides a method for classifying products according to the degree of dust, water and collision prevention of electrical equipment and packaging, and the system is approved by most european countries and drafted by the International Electrotechnical Commission (IEC). The level of protection is often expressed in IP followed by two numbers, which are used to clarify the level of protection. The first number indicates the extent to which the device is resistant to dust particles, or the extent to which people are protected from harm in a sealed environment. I represents a level of preventing the entry of solid foreign matter, the lowest level is 0, indicating no protection, and the highest level is 6; the second letter indicates the degree to which the device is water resistant. P represents the level of water ingress protection, the lowest level is 0, indicating no protection, and the highest level is 8.

IPXX dustproof and waterproof grade:

dust-proof rating (first X indicates):

0: no protection is provided;

1: prevent the intrusion of large solids;

2: preventing the intrusion of medium-sized solids;

3: preventing small solids from entering;

4: prevent the solid of the object larger than 1mm from entering;

5: preventing the accumulation of harmful dust;

6: completely preventing the entry of dust.

Water resistance rating (second X denotes):

0: no protection is provided;

1: water drops are dripped into the shell without influence;

2: when the shell is inclined to 15 degrees, water drops are dripped into the shell without influence;

3: water or rainwater falls onto the shell from an angle of 60 degrees without influence;

4: liquid is splashed to the shell from any direction without harm influence;

5: no harm is caused by washing with water;

6: environments available within the cabin;

7: can resist immersion (1 m) in a short time;

8: soaking in water under certain pressure for a long time.

Wherein: IP20 denotes, dustproof: preventing the intrusion of medium-sized solids; and (3) water proofing: there is no protection.

IP55 denotes, dustproof: preventing the accumulation of harmful dust; and (3) water proofing: the water washing is carried out without any damage.

The above description is only for the specific embodiments of the present application, but the scope of the present application is not limited thereto, and any person skilled in the art can easily think of the changes or substitutions within the technical scope of the present application, and shall be covered by the scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.

Claims (10)

1. A frequency converter, comprising:

a housing (100), and a power board (200) and a drive board (300) provided in the housing (100);

the power board (200) comprises a power substrate (201) and a power module (202) arranged on one side of the power substrate (201);

the driving board (300) comprises a driving substrate (301) and a driving circuit arranged on the driving substrate (301), and the driving circuit is connected with the power module (202) and is used for driving the power module (202) to work;

the housing (100) includes a rear sidewall (11), and orthographic projections of the driving board (300) and the power board (200) on the rear sidewall (11) overlap in a width direction of the housing (100).

2. Frequency converter according to claim 1, characterized in that the drive substrate (301) is arranged perpendicular to the power substrate (201).

3. The frequency converter according to claim 2, characterized in that the drive substrate (301) is disposed at one side edge of the power substrate (201) in a width (W) direction of the case (100).

4. The frequency converter according to claim 1, characterized in that the driving board (300) further comprises components arranged on the driving substrate (301), wherein the driving substrate (301) and the components are both located on a side of the power substrate (201) away from the rear side wall (11);

the power board (200) further comprises a bus capacitor (203) arranged on the power substrate (201), and the bus capacitor (203) is located between the power substrate (201) and the rear side wall (11).

5. Frequency converter according to claim 1, characterized in that it further comprises a filter plate (500), said filter plate (500) being arranged on the side of said power substrate (201) remote from the rear side wall (11).

6. The frequency converter according to any of claims 1 to 5, further comprising a control board (400), wherein the control board (400) comprises a control substrate (401) and a control chip (402) disposed on the control substrate (401), and the control chip (402) is connected to the driving circuit and is located on a side of the driving board (300) away from the power substrate (201).

7. Frequency converter according to claim 6, characterized in that it further comprises an option card (600), said option card (600) being electrically connected to said control chip (402) and being located on the side of said control substrate (401) remote from said rear side wall (11).

8. The frequency converter according to claim 7, characterized in that the number of the option cards (600) is plural, the plural option cards (600) are arranged along the height (H) direction of the housing (100), and the plural option cards (600) are arranged in a step shape with respect to the control substrate (401).

9. Frequency converter according to claim 1, characterized in that the housing (100) comprises a front shell (3), a rear shell (1), and a middle shell (2) connected between the front shell (3) and the rear shell (1);

the rear shell (1) comprises a rear side wall (11), a first partition wall (13) and a rear shell (1) side wall connecting the rear side wall (11) and the first partition wall (13), and a first space (12) is formed among the first partition wall (13), the rear shell (1) side wall and the rear side wall (11);

the middle shell (2) comprises a second partition wall (21) and a side wall of the middle shell (2) arranged at the edge of the second partition wall (21), the side wall of the middle shell (2) is detachably connected with the side wall of the rear shell (1), and a second space (22) is formed among the second partition wall (21), the side wall of the middle shell (2) and the first partition wall (13);

the front shell (3) comprises a front side wall (31) and a front shell (3) side wall arranged at the edge of the front side wall (31), the front shell (3) side wall is detachably connected with the middle shell (2) side wall, and a third space (32) is formed among the second partition wall (21), the front shell (3) side wall and the front side wall (31) of the shell (100);

the power substrate (201) with the drive plate (300) is located in the second space (22), a module avoiding opening (135) is formed in the first partition wall (13), and the power module (202) is extended into the first space (12) through the module avoiding opening (135).

10. Frequency converter according to claim 9, characterized in that it further comprises a first seal (1300) and a second seal (1400);

the first sealing piece (1300) is arranged at the joint of the side wall of the rear shell (1) and the side wall of the middle shell (2); the second sealing piece (1400) is arranged at the joint of the side wall of the middle shell (2) and the side wall of the front shell (3).

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