CN210007603U - Frequency converter - Google Patents

Abstract

The utility model discloses an kind of converters, place a plurality of electric capacity (4) in the box in including, be equipped with electric capacity support (5) and electric capacity protection shield (6) in the box, electric capacity protection shield (6) with be formed with electric capacity between the box shell (8) of box and keep apart the installation cavity, it is a plurality of electric capacity (4) location install in on electric capacity support (5) and set up in the installation cavity is kept apart to electric capacity the utility model discloses an in the converter, set up the electric capacity protection shield who has to protect function to a plurality of electric capacity, the electric capacity protection shield can block that the material that explodes after exploding under the electric capacity abnormal conditions splashes the human body and injures the people to the safety in utilization of product has been improved.

Description

Frequency converter

Technical Field

The utility model relates to a converter field specifically, relates to kinds of converters.

Background

In a conventional inverter, a box-type inverter is generally used. The frequency converter is often provided with a plurality of components such as capacitors with large capacity, the installation position relationship between the capacitors and other components is very important, in addition, the ambient temperature near the capacitors is not too high, and otherwise, the service life of the capacitors can be influenced.

SUMMERY OF THE UTILITY MODEL

The utility model aims at providing kinds of converter that have safeguard function and structure are more compact.

In order to realize the above-mentioned purpose, the utility model provides an kind of converters, place a plurality of electric capacity in the box in including, be equipped with electric capacity support and electric capacity protection shield in the box, the electric capacity protection shield with be formed with electric capacity between the box shell of box and keep apart the installation cavity, it is a plurality of the electric capacity location install in on the electric capacity support and setting up in the installation cavity is kept apart to electric capacity.

the capacitor isolation installation cavity is defined at the end of the cavity by the bottom wall, side wall and end wall of the box body and the capacitor protection board, and the capacitor protection board is parallel to the bottom wall of the box body and spaced apart from the bottom wall.

in some embodiments, a support frame is provided on an inner wall surface of the box housing, and at least a part of the plate edges of the capacitor holder and the capacitor protection plate are attached to the support frame.

in some embodiments, at least a portion of the edges of the capacitor support and the capacitor protection board are formed with edge flanges, and the capacitor support and the capacitor protection board are fixedly connected to the inner wall surface of the case housing through the respective edge flanges.

in some embodiments, the capacitor holder has a plurality of capacitor positioning holes formed therethrough, the capacitors are cylindrical and axially penetrate the capacitor positioning holes, and the capacitor protection plate covers at least the top ends of the capacitors.

the capacitor support side is provided with a voltage-sharing resistor mounting support, and the corresponding side of the capacitor protection board is supported on the voltage-sharing resistor mounting support.

in some embodiments, the capacitance bracket has a capacitance temperature sensor via hole in the middle, and a capacitance temperature sensor is inserted into the capacitance temperature sensor via hole.

in some embodiments, the capacitance bracket is further provided with a fastening belt fixing hole, and the capacitance temperature sensor is fixed to the fastening belt fixing hole through a fastening belt.

in some embodiments, the capacitor support and the capacitor protection plate are both sheet metal parts.

in some embodiments, the frequency converter further includes a power strip mounted above the top surface of the capacitance protection plate.

Through the technical scheme, the utility model discloses an in the converter, the electric capacity protection shield that has and decide safeguard function has been add to the electric capacity of a plurality of large capacities, and the electric capacity protection shield can block that the material that explodes after the explosion under the abnormal conditions of electric capacity splashes the phenomenon that the human body wounded the people to the safety in utilization of product has been improved.

Other features and advantages of the present invention will be described in detail in the detailed description which follows.

Drawings

The accompanying drawings are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification , which together with the following detailed description serve to explain the invention, but are not intended to limit the invention.

Fig. 1 and 2 are perspective views of a mounting panel for a frequency converter according to an embodiment of the present invention;

fig. 3, 4 and 7 are perspective views of a case housing for a frequency converter according to an embodiment of the present invention;

figures 5 and 6 show the assembly and disassembly of the mounting panel and the base of the housing of figure 3 (figures 4 or 7);

fig. 8 is a schematic diagram (partial structure is not shown) of the internal structure of the box body cavity of the frequency converter according to the embodiment of the present invention, mainly illustrating the installation structure schematic diagram of the capacitor module and the equalizing resistor module;

FIG. 9 shows a schematic structural diagram of a capacitor module;

FIGS. 10 and 11 are exploded views of a portion of the structure of FIG. 9;

FIG. 12 illustrates an exploded view of the assembly of the capacitive temperature sensor of FIG. 9;

fig. 13 is a perspective view of a capacitor holder with a voltage equalizing resistor module according to an embodiment of the present invention;

FIG. 14 is an exploded view of the assembly of FIG. 13; and

fig. 15 is a perspective view of the mounting bracket for the equalizing resistor in fig. 13.

Description of the reference numerals

1 upper side voltage-sharing resistor and 2 voltage-sharing resistor mounting bracket

3 lower side voltage equalizing resistor 4 capacitor

5 capacitance support 6 capacitance protection board

7 fastener 8 box body shell

9 capacitance temperature sensor 10 support

11 power panel 12 lacing tape

21 lower resistor mounting part 22 upper resistor mounting part

201 fastener connecting hole 211 lower ear plate

23 reserved overhead layer 24 upper supporting part

241 vertical supporting plate 242 supporting plate top edge flanging

51 capacitor support through hole 52 capacitor positioning hole

53 electric capacity temperature sensor via hole 54 lacing tape fixed orifices

801 bottom 802 side wall of case

803 end wall of box body

80 housing base 84 mounting panel

805 end peripheral edge retraction bearing platform 806 bearing platform flanging

806a cushion cap turn-ups mounting hole 806b spliced eye

841 panel body 842 panel peripheral flange

843 hem 8420 rectangular hem

842a plug-in hook 842b panel flanging mounting hole

Detailed Description

The following detailed description of the embodiments of the present invention will be made with reference to the accompanying drawings. It is to be understood that the description of the embodiments herein is for purposes of illustration and explanation only and is not intended to limit the invention.

In the present invention, unless otherwise specified, the use of directional terms such as "upper, lower, top, bottom" and "upper" are generally used with respect to the orientation shown in the drawings or the positional relationship of the components with respect to each other in the vertical, vertical or gravitational direction. Wherein "inner and outer" are relative to the center of the chamber, with the center closer to the chamber being "inner" and the center further from the chamber being "outer".

The prior art has the problems of a large number of screws and complicated assembly, and the surface cleanness and the aesthetic appearance of the mounting panel are influenced, and the mounting panel usually has heavier weight, so that an operator has great inconvenience in aligning the mounting panel and tightening the fasteners by holding the mounting panel by hand.

To the above-mentioned mounting panel's a great deal of problem, the utility model provides a neotype mounting panel for converter, as shown in fig. 1 to fig. 2, this mounting panel 84 is the rectangle cover panel of mask formula and includes panel body 841 and panel week along turn-ups 842, is provided with grafting couple 842a on rectangle limit turn-ups 8420 of turn-ups 842 around the panel and is provided with panel turn-ups mounting hole 842b on other rectangle limit turn-ups.

It is thus clear that replace the current mounting means that runs through panel body 841 with the fastener, the utility model discloses an installation panel 84 has adopted the rectangle cover panel of mask formula to with installation panel 84's fixed part transfer to panel week along turn-ups 842 rather than on panel body 841, make this installation panel 84's shroud effect more pleasing to the eye simultaneously, the utility model discloses an installation panel 84 has adopted the cooperation connected mode of grafting couple 842a and panel turn-ups mounting hole 842b to the installation operation is the example (dismantlement step is vice versa.) firstly, operating personnel can fix the spacing with installation panel 84 temporary end with rectangle limit turn-ups 8420 through grafting couple 842a, and buckle panel body 841 cover, and operating personnel can liberate the one hand earlier this moment, then carries out fixed mounting to a small amount of turn-ups mounting hole 842b on other rectangle limit turn-ups portion.

In the installation panel 84 of the present invention, the structure and the insertion form of the insertion hook 842a are various. For the plugging manner, the plugging hook 842a can plug the cover vertically towards the housing body (see the housing body 8 of fig. 3) in a direction perpendicular to the panel body 841 of itself; or the inserting hook 842a is parallel to the panel body 841 direction of the self, and is inserted into the cover from top to bottom or from left to right. In addition, the specific shape of the insertion hook 842a is not limited, and may be a polygonal insertion block or a plug.

Specifically, in the embodiments of the mounting panel 84 of the present invention, the plug hooks 842a are disposed on the inner sidewall of the th rectangular flanging portion 8420 and are formed as inwardly extending plugs extending in a direction parallel to the panel body 841.

Optionally, the edge of the panel peripheral flange 842 is formed with an inwardly rolled flange 843. the flange 843 enables the mounting panel 84 to have the panel peripheral flange 842 as a folded flange, and the panel peripheral flange 842 is further folded inwardly to form the flange 843. the flange 843 not only enhances the strength of the mounting panel 84, but also prevents the panel peripheral flange 842 from directly acting on the palm when the operator has both hands to mount the panel 84, thereby functioning as a hand scrape preventer.

Alternatively, the plug hook 842a is preferably formed on the beaded part 843, that is, the plug hook 842a is disposed to extend along an edge portion of the beaded part 843. for example, the plug hook 842a may be connected to the beaded part 843 by welding, or the plug hook 842a may be formed integrally with the beaded part 843 . of course, the plug hook 842a may be formed with a spacing of from the beaded part 843.

Because the box shell of converter adopts the sheet metal component material usually, and the utility model discloses an among the installation panel 84 is applied to the finish panel of the box shell of converter usually, installation panel 84 also adopts the sheet metal component and decides the rectangle panel of total area for having , and its weight is not less than 0.8 kg. operating personnel usually when installing this installation panel 84 that has heavier quality, can experience the sense better, consequently, can reduce through this scheme and lift or prop up the installation step of holding up time and having simplified installation panel 84 effectively.

The utility model discloses kinds of box shell for converter is still provided, as shown in fig. 3 and fig. 4, box shell 8 includes shell local 80 and foretell installation panel 84 for the converter, and installation panel 84 cover formula is installed on shell local 80 because the utility model discloses a box shell 8 for converter includes foretell the utility model discloses an installation panel 84, consequently also included foretell all advantages, no longer repeated description to this .

The open end of the housing base 80 may further be formed with an end peripheral indented platform 805 extending inward from the peripheral edge, the end peripheral indented platform 805 is formed with a platform flange 806 abutted to the panel peripheral edge flange 842 in a fitting manner, and the platform flange 806 is provided with a platform flange mounting hole 806a aligned with the panel flange mounting hole 842b and an insertion hole 806b aligned with the insertion hook 842a, so that the appearance is more concise and elegant, and the structure is more reasonable. Of course, the open end of the housing base 80 may not be provided with the end peripheral indentation bearing platform 805, and the mounting panel 84 is directly covered and buckled on the housing base 80, which is also the protection range of the box housing 8 for the frequency converter of the present invention.

, the flange width of the flange 806 can be larger than the flange width of the panel peripheral flange 842, so that a gap is formed between the panel peripheral flange 842 and the end peripheral flange indented into the platform 805.

As shown in FIG. 7, the gap width L of the attaching/detaching gap is preferably 5mm to 15 mm. Therefore, the integrity and the attractiveness of the product are ensured on the premise of ensuring the convenience of holding by an operator, and the overall appearance of the box body shell 8 is layered.

The utility model discloses an kinds of dismouting in-process of box shell 8 of converter, as shown in fig. 5 and fig. 6, box shell 8 of converter is the hanging box shell in top, grafting couple 842a sets up on the panel week edge turn-ups 842 at the top of installation panel 84, and only set up 2 or a plurality of panel turn-ups mounting hole 842b on the panel week edge turn-ups 842 of bottom, to this, for the installation is the example, at first aim at grafting couple 842a on shell this portion 80, then buckle installation panel 84 cover on shell this portion 80, can loosen both hands this moment even, at last alright use fastener pass panel turn-ups mounting hole 842b with on installation panel 84 locking shell this portion 80, the fastener is small in quantity, and easy operation.

Additionally, the utility model discloses still provide kind of converters, this converter includes foretell box shell 8 that is used for the converter, and consequently this converter has included all above-mentioned advantages of this box shell 8, no longer is repeated.

In the conventional inverter, since a plurality of capacitors having a large capacity are generally used in the inside of the case body, two or more voltage equalizing resistors are arranged to enhance the reliability of the capacitors. These voltage-sharing resistors are usually installed side by side, and occupy a large installation space, which is not favorable for realizing the requirement of installation compactness of the box body cavity of the box body of the frequency converter.

The utility model provides an neotype voltage-sharing resistance module, as shown in fig. 13 and 14, this voltage-sharing resistance module includes the upside voltage-sharing resistance 1 and the downside voltage-sharing resistance 3 of voltage-sharing resistance installing support 2 and vertical stromatolite installation, and voltage-sharing resistance installing support 2 (see fig. 15 shown) is formed with between downside resistance installing department 21 and the upside resistance installing department 22 of installing upside voltage-sharing resistance 1 and reserves the built on stilts layer 23 including installing downside voltage-sharing resistance 3's downside resistance installing department 21.

It is thus clear that in the utility model discloses an among the equalizer resistor module, because two equalizer resistors (including upside equalizer resistor 1 and downside equalizer resistor 3) adopt range upon range of mode to install in the upper and lower both sides of equalizer resistor installing support 2, be provided with on equalizer resistor installing support 2 and reserve the built-in layer 23, this reservation built-in layer 23 can reserve definite installation space, can prevent in two equalizer resistors about fixed mounting, two upper and lower equalizer resistors that the stromatolite was arranged take place between mechanical interference, make range upon range of formula's equalizer resistor's installation effect better, finally make two equalizer resistors can install become modular equalizer resistor module, be convenient for realize the compact effect of mounting structure.

As shown in fig. 13 and 14, generally, in kinds of embodiments of the equal safety resistor module of the present invention, the upper resistor mounting portion 22 and the lower resistor mounting portion 21 are respectively provided with the fastener connecting holes 201 arranged at intervals, the upper voltage-sharing resistor 1 and the lower voltage-sharing resistor 3 are respectively mounted to the corresponding upper resistor mounting portion 22 and the lower resistor mounting portion 21 via the fasteners 7 passing through the fastener connecting holes 201, in this embodiment, the upper voltage-sharing resistor and the lower voltage-sharing resistor are fixed mounting manners using the fasteners 7, when the fasteners 7 pass from the upper side and the lower side of the voltage-sharing resistor mounting bracket 2 respectively to fix the upper voltage-sharing resistor 1 and the lower voltage-sharing resistor 3, the tails of the fasteners 7 on the upper side and the lower side can be fully accommodated in the reserved empty layer 23 of the voltage-sharing resistor mounting bracket 2, thereby avoiding the problem of mechanical interference between the fasteners 7.

The utility model discloses an among the voltage-sharing resistance module, the concrete structural style of voltage-sharing resistance installing support 2 is not limited, can include multiple different structure the utility model discloses an among kinds of embodiments of voltage-sharing resistance installing support 2, as shown in FIG. 15, voltage-sharing resistance installing support 2 includes as the upper strata board of upside resistance installation department 22 and as the lower floor plate of downside resistance installation department 21, upper strata board and lower floor plate set up along vertical parallel interval, lower floor plate includes the lower floor otic placode 211 that independently sets up under the both ends of upper strata board respectively is like, because voltage-sharing resistance's installation department sets up in the both ends of body usually, this voltage-sharing resistance installing support 2 will be fixed on electric capacity module usually in order to utilize its partial pressure principle to guarantee to make the impartial performance of each electric capacity top voltage, correspondingly, the lower floor plate of resistance installing support 2 is for the part that is used for connecting electric capacity module, and lower floor plate also can be the platelike structure the upper strata board the same with the upper strata board, help this voltage-sharing resistance installing support 2 manufacturing, as in FIG. 15, lower floor plate has included the structural style of two tip optionally, can make the fixed lower floor's resistance installing support can also can guarantee to support 3 firm effect on the fixed voltage.

With continued reference to fig. 15, the varistor mounting bracket 2 may further include an upper support portion 24 extending upward above the upper resistor mounting portion 22, so that when the varistor module is mounted, the upper support portion 24 above the module can also support and mount other components inside the casing cavity of the frequency converter, such as the capacitor protection plate 6, as will be further described in detail in relation to the capacitor module at .

Alternatively, as shown in fig. 15, the upper support portion 24 may include a vertical support plate 241 upwardly protruding from a side edge portion of the upper plate, and a top edge of the vertical support plate 241 is formed with a support plate top edge flange 242 folded over the upper side equalizing resistor 1. The vertical supporting plate 241 is used for raising the overall height of the voltage-sharing resistor mounting bracket 2, and the supporting plate top edge flange 242 is a supporting plane.

The utility model discloses still provide kind of converters, it is shown with reference to fig. 8 to 11, place the electric capacity module and the foretell uniform resistance module in the box in the converter is including in, electric capacity module is including installing a plurality of electric capacity 4 on electric capacity support 5, and the uniform resistance module is installed on electric capacity support 5.

Therefore, in the box cavity of the frequency converter, the mode of combining and installing the uniform resistance module and the capacitor module not only ensures that the structure is more reasonable and reliable, but also is beneficial to realizing the design of the installation compactness of the inner space of the whole box cavity.

In an assembled module composed of a capacitor module and a uniform resistance module, referring to fig. 13, a lower resistor mounting portion 21 is mounted on a top surface of a capacitor support 5, an upper resistor mounting portion 22 and the lower resistor mounting portion 21 are respectively provided with fastener connecting holes 201 arranged at intervals in a penetrating manner, and a capacitor support penetrating hole 51 aligned with the fastener connecting holes 201 of the lower resistor mounting portion 21 is provided on the capacitor support 5.

The upper side voltage equalizing resistor 1 is mounted on the upper side resistor mounting part 22 through a fastener 7 passing through a fastener connecting hole 201, and the lower side voltage equalizing resistor 3 is arranged at the bottom of the capacitor support 5 and mounted on the lower side resistor mounting part 21 through the fastener 7 passing through the capacitor support through hole 51 and the fastener connecting hole 201 in alignment.

Referring to fig. 8 to 11, the capacitors 4 are arranged at intervals along the length direction of the capacitor support 5, and the voltage equalizing resistor modules are arranged at the end portions of the capacitor support 5 in the length direction, so that the arrangement between the voltage equalizing resistor modules and the capacitor modules is closer and more compact, the space utilization rate is higher, and the space utilization rate of the inside of the whole box cavity can be improved.

As shown in fig. 9 and fig. 10, in particular, in the frequency converter of the present invention, the capacitor module includes the capacitor protection plate 6, the capacitor protection plate 6 is disposed above the capacitor support 5 and covers the plurality of capacitors 4, since the voltage-equalizing resistor mounting bracket 2 may further include the upper support portion 24 upwardly extending above the upper resistor mounting portion 22, the capacitor protection plate 6 may be supported on the upper support portion 24 of the voltage-equalizing resistor mounting bracket 2.

Like this, electric capacity protection shield 6 supports on voltage-sharing resistance installing support 2, thereby make voltage-sharing resistance installing support 2 on having the basis that can be used to the equal ampere of resistance of installation, can also support the electric capacity protection shield 6 of addding, give full play to a plurality of use values of part, reduce the use quantity of part, and then improved the space utilization in the box intracavity, simultaneously, because adopted the electric capacity of a plurality of large capacities in current converter usually, in the use of these electric capacities, because factors such as voltage variation is big and ambient temperature variation, probably cause electric capacity to burn out or even the phenomenon of explosion, have definite potential safety hazard, for this, the utility model discloses an in the converter, electric capacity protection shield 6 that has definite safeguard function has been add in a plurality of electric capacity 4's top, electric capacity protection shield 6 can block that electric capacity 4 explodes the material that splits under the abnormal conditions and splash to the human body, thereby the safety in utilization of product has been improved.

Wherein, be formed with electric capacity between the box shell 8 of electric capacity protection shield 6 and box and keep apart the installation cavity, equal ampere of resistance module, electric capacity support 5 and a plurality of electric capacity 4 all hold in electric capacity keeps apart the installation cavity.

As shown in fig. 11, the capacitor isolation mounting cavity is defined at an end of the cavity by the bottom wall 801 of the box housing 8, the side wall 802 of the box, the end wall 803 of the box, and the capacitor protection plate 6 is disposed parallel to and spaced apart from the bottom wall 801 of the box.

In the embodiments of the frequency converter relating to the fixing structure of the capacitor support 5 and the capacitor protection board 6 of the present invention, the inner wall surface of the box casing 8 can be provided with the support frame 10, and at least part of the board edges of the capacitor support 5 and the capacitor protection board 6 are mounted on the support frame, so, referring to fig. 10, the end of the capacitor protection board 6 can be supported and fixed on the support frame 10, and in addition, the end is fixedly connected on the equal safety resistor mounting support 2, the mounting structure is simple and reasonable, wherein, the support frame 10 can be fixed on the inner wall surface of the box casing 8 by welding and the like.

In another embodiments of the frequency converter relating to the fixing structure of the capacitor support 5 and the capacitor protection board 6, at least a part of the boards of the capacitor support 5 and the capacitor protection board 6 are formed with board flanges, and the capacitor support 5 and the capacitor protection board 6 are fixedly connected to the inner wall surface of the box housing 8 through the respective boards along the flanges, that is, the capacitor support 5 and the capacitor protection board 6 are respectively formed with boards for connection along the flanges, and can be connected in a through-connection mode or a welding mode through fasteners.

Referring to fig. 8 and 12, a plurality of capacitor positioning holes 52 are formed through the capacitor support 5, the capacitors 4 are cylindrical and axially penetrate through the capacitor positioning holes 52, and the capacitor protection plate 6 covers at least the top end of each capacitor 4 to ensure the protection effect of the capacitor protection plate 6 on the capacitors 4.

Referring to fig. 10 and 12, a capacitance temperature sensor through hole 53 is formed in the middle of the capacitance support 5, and a capacitance temperature sensor 9 is inserted into the capacitance temperature sensor through hole 53. Like this, through setting up electric capacity temperature sensor 9 in the middle part of electric capacity support 5, the actual ambient temperature of a plurality of electric capacity 4 of just accurate detection of ability, under this condition, through in time to electric capacity 4's in the box intracavity ambient temperature's control and problem processing, ensured electric capacity 4's safety in utilization and can improve electric capacity 4's life.

Wherein, still be equipped with lacing tape fixed orifices 54 on the capacitive support 5, electric capacity temperature sensor 9 is fixed in lacing tape fixed orifices 54 through lacing tape 12 to make electric capacity temperature sensor 9's fixed more reliable, clean and tidy.

Optionally, the capacitor support 5 and the capacitor protection plate 6 are both sheet metal parts, and on the premise that the capacitor protection plate 6 has a protection blocking effect, the processing and manufacturing and the production cost reduction are further facilitated.

Wherein, in the utility model discloses an among the converter, the converter is still including installing power strip 1 in the top surface top of electric capacity protection shield 6, and is visible, and electric capacity protection shield 6 that adds can not only play the guard action that improves electric capacity 4, can also set up box chamber layering subregion to components and parts such as power strip 1 have provided the installation fixed space on the surface space of electric capacity protection shield 6, have further step-by-step improved the space utilization of the product of converter.

The preferred embodiments of the present invention have been described in detail with reference to the accompanying drawings, however, the present invention is not limited to the details of the above embodiments, and the technical concept of the present invention can be within the scope of the present invention to perform various simple modifications to the technical solution of the present invention, and these simple modifications all belong to the protection scope of the present invention.

It should be noted that the various features described in the above embodiments may be combined in any suitable manner without departing from the scope of the invention. In order to avoid unnecessary repetition, the present invention does not separately describe various possible combinations.

In addition, various embodiments of the present invention can be combined arbitrarily, and the disclosed content should be regarded as the present invention as long as it does not violate the idea of the present invention.

Claims (10)

1. The utility model provides an kind of converters, including placing a plurality of electric capacity (4) in the box in, its characterized in that, be equipped with electric capacity support (5) and electric capacity protection shield (6) in the box, electric capacity protection shield (6) with be formed with electric capacity between box shell (8) of box and keep apart the installation cavity, it is a plurality of electric capacity (4) location install in on electric capacity support (5) and set up in the installation cavity is kept apart to the electric capacity.
2. 2. Frequency converter according to claim 1, characterized in that the capacitive isolation mounting cavity is defined at the end of the tank cavity by a tank bottom wall (801), tank side walls (802), tank end walls (803) and the capacitive protection plate (6) of the tank housing (8), the capacitive protection plate (6) being arranged parallel to and spaced apart from the tank bottom wall (801).
3. 3. Frequency converter according to claim 2, characterized in that a support frame (10) is provided on the inner wall surface of the box housing (8), on which support frame at least part of the plate edges of the capacitor support (5) and the capacitor protection plate (6) are mounted.
4. 4. The frequency converter according to claim 2, characterized in that at least part of the edges of the capacitor support (5) and the capacitor protection plate (6) are formed with edge flanges, and the capacitor support (5) and the capacitor protection plate (6) are fixedly connected to the inner wall surface of the box housing (8) through the respective edge flanges.
5. 5. The frequency converter according to any of claims 1-4, wherein a plurality of capacitor positioning holes (52) are formed through the capacitor support (5), the capacitors (4) are cylindrical and axially penetrate through the capacitor positioning holes (52), and the capacitor protection plate (6) covers at least the top end of each capacitor (4).
6. 6. Frequency converter according to claim 5, characterized in that the side of the capacitive support (5) is provided with a grading resistor mounting bracket (2), and the corresponding side of the capacitive protection plate (6) is supported on the grading resistor mounting bracket (2).
7. 7. The frequency converter according to claim 5, characterized in that a capacitance temperature sensor through hole (53) is arranged in the middle of the capacitance bracket (5), and a capacitance temperature sensor (9) is inserted into the capacitance temperature sensor through hole (53).
8. 8. The frequency converter according to claim 7, wherein the capacitor support (5) is further provided with a fastening strap fixing hole (54), and the capacitor temperature sensor (9) is fixed to the fastening strap fixing hole (54) through a fastening strap (12).
9. 9. Frequency converter according to claim 1, characterized in that the capacitive support (5) and the capacitive protection plate (6) are both sheet metal parts.
10. 10. Frequency converter according to claim 1, characterized in that it further comprises a power supply board (1) mounted above the top surface of the capacitive protection board (6).

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