CN215268036U - Frequency converter - Google Patents

Abstract

The utility model provides a frequency converter, which comprises a capacitance plate, a plurality of direct current bus capacitors, a first box body and a second box body which are integrally assembled, wherein a frequency conversion component is arranged in the second box body; the capacitor plate is arranged on the first box body, the first box body is arranged on the top of the second box body, and the capacitor plate is electrically connected with the frequency conversion assembly in the second box body in a detachable mode through a conductive member; a first heat dissipation air channel is formed in the first box body; the direct current bus capacitors are respectively fixed on the capacitor plates, and when the capacitor plates are installed on the first box body, the main body parts of the direct current bus capacitors are located in the first heat dissipation air duct. The utility model discloses a direct current bus-bar electric capacity need not to dismantle the frequency conversion subassembly when the dismouting is maintained, and maneuverability is strong, and convenient operation is swift, and the dismouting degree of difficulty is low, can solve frequently to dismantle the problem that easily causes the frequency conversion subassembly to damage simultaneously, avoids increasing the maintenance cost.

Description

Frequency converter

Technical Field

The embodiment of the utility model provides a relate to the power control equipment field, more specifically say, relate to a 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 mode of a working power supply of the motor. The direct current bus is a very important component in the frequency converter, can produce higher heat in the use process, and belongs to heating components. However, the service life of the capacitor in the dc bus is strongly related to the temperature, and as the temperature rises and the capacitor is in a high temperature environment for a long time, the service life and performance of the dc bus capacitor are greatly reduced, so that the capacitor needs to be frequently disassembled and replaced during maintenance.

At present, in order to realize the heat dissipation of the dc bus capacitor, the dc bus capacitor and the frequency conversion component are often installed in a heat dissipation air duct, and the heat dissipation is performed through air cooling. And, in order to avoid influencing the equipment maintenance operation of frequency conversion subassembly, direct current bus-bar capacitor generally installs at quick-witted bottom of the case portion, assembles in frequency conversion subassembly one side of maintaining the opening dorsad promptly, so need demolish frequency conversion subassembly earlier and just can carry out the maintenance of direct current bus-bar capacitor and change to lead to direct current bus-bar capacitor's maintenance operation comparatively difficult, make operating efficiency low, extravagant manpower, and frequently dismantle frequency conversion subassembly still causes the damage easily, increased the maintenance cost.

SUMMERY OF THE UTILITY MODEL

The embodiment of the utility model provides a to above-mentioned current direct current bus-bar capacitance's maintenance operation difficulty, operating efficiency are low, damage the frequency conversion subassembly easily and increased the problem of maintenance cost, provide a new converter.

The embodiment of the utility model provides a technical scheme who solves above-mentioned technical problem is, provide a converter, including electric capacity board, a plurality of direct current bus-bar capacitance and assemble integrative first box and second box, and install the frequency conversion subassembly in the second box;

the capacitor plate is arranged on the first box body, the first box body is arranged on the top of the second box body, and the capacitor plate is electrically connected with the frequency conversion assembly in the second box body in a detachable mode through a conductive member;

a first heat dissipation air channel is formed in the first box body; the direct current bus capacitors are respectively fixed on the capacitor plates, and when the capacitor plates are installed on the first box body, the main body parts of the direct current bus capacitors are located in the first heat dissipation air duct.

Preferably, the frequency converter further comprises a fan assembly detachably mounted in the first case; at least two ventilation openings are formed in the side wall of the first box body, and the fan assembly and the first heat dissipation air duct are located between the two ventilation openings.

Preferably, the capacitor plate is fixed to the outer side of the bottom plate of the first box through screws, the bottom plate of the first box is provided with a plurality of through holes matched with the dc bus capacitors, and each dc bus capacitor fixed on the capacitor plate is inserted into the first box through one of the through holes.

Preferably, the capacitor plate is provided with a conductive terminal connecting position, and the capacitor plate is locked and fixed with the conductive member through a bolt penetrating through the conductive terminal connecting position; the bottom plate of the first box body is provided with an operation opening, and when the capacitor plate is assembled on the bottom plate, the conductive terminal connecting position of the capacitor plate is exposed to the operation opening.

Preferably, the fan assembly covers or partially covers the operation opening when the fan assembly is fitted into the first case.

Preferably, the fan assembly comprises a mounting bracket and at least one heat dissipation fan assembled and fixed on the mounting bracket, and both sides of the mounting bracket are respectively provided with a convex edge which is arranged in a protruding manner; first box includes that two are located respectively on two relative lateral walls of first box, and with the bar groove of chimb looks adaptation, just fan assembly passes through the chimb of installing support both sides is the mode assembly of the bar groove on the joint cooperation two lateral walls respectively in the first box.

Preferably, the first box body is rectangular; the first box body comprises a base and a sealing cover which are assembled into a whole in a detachable mode, the cross section of the base is U-shaped, and when the sealing cover is assembled on the base, a cavity for assembling the direct-current bus capacitor is formed between the sealing cover and the base; the capacitor plate is fixedly installed on one side, back to the sealing cover, of the bottom plate of the base, and the two strip-shaped grooves are formed in the two side walls of the base respectively.

Preferably, two the bar groove all is perpendicular to the bottom plate of base, and each the bar groove is enclosed by two interval distribution's rectangular chimb and closes and form.

Preferably, the fan assembly is assembled to the center in the first case in such a manner that an air blowing direction is arranged along a length direction of the first case, and both side walls of the first case in the length direction are respectively provided with a vent hole; and when the direct current bus capacitor is assembled in the first box body through the capacitor plate, the direct current bus capacitor is distributed between the ventilation holes in the two side walls of the first box body and the fan assembly.

Preferably, the frequency conversion assembly comprises a rectification module and an inversion module which are respectively installed in the second box body, and the capacitor plate is electrically connected with the inversion module through the conductive member; a second heat dissipation air channel is formed in the second box body, and the rectification module and the inversion module are located in the second heat dissipation air channel.

The utility model discloses converter has following beneficial effect: the first box body and the second box body which are integrally assembled are arranged, so that the direct-current bus capacitor and the frequency conversion assembly can be separated, namely the direct-current bus capacitor can be assembled above the frequency conversion assembly in a detachable mode through the first box body, the direct-current bus capacitor can be disassembled together by disassembling the first box body without disassembling the frequency conversion assembly, the frequency conversion assembly can be maintained after the first box body is disassembled, the direct-current bus capacitor can be maintained and replaced, the operability is strong, the operation is convenient and fast, the disassembly and assembly difficulty of the direct-current bus capacitor is reduced, the working efficiency is greatly improved, and the waste of manpower resources is avoided; in addition, the frequency conversion assembly does not need to be disassembled, so that the installation stability of the frequency conversion assembly in the second box body can be ensured, and the problem that the frequency conversion assembly is easily damaged due to frequent disassembly is solved, so that the increase of maintenance cost is avoided; because the first heat dissipation air channel is formed in the first box body, the direct current bus capacitor can be cooled by the first heat dissipation air channel, the direct current bus capacitor is ensured to keep at a lower temperature, the service life of the direct current bus capacitor is prolonged, the performance of the direct current bus capacitor is ensured, the replacement times of the direct current bus capacitor can be reduced, the utilization rate of the direct current bus capacitor is improved, the maintenance cost can be effectively reduced, and the frequency converter is high in practicability.

Drawings

Fig. 1 is a schematic structural diagram of a frequency converter according to an embodiment of the present invention;

fig. 2 is a schematic structural diagram of a first box of a frequency converter according to an embodiment of the present invention;

fig. 3 is a schematic partial structure diagram of a frequency converter according to an embodiment of the present invention;

fig. 4 is a schematic structural diagram of a fan assembly of a frequency converter according to an embodiment of the present invention;

fig. 5 is a schematic structural diagram of a frequency converter according to another embodiment of the present invention.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

As shown in fig. 1, it is a schematic structural diagram of the frequency converter provided by the embodiment of the present invention, and the frequency converter can be applied to the field of power control equipment. Referring to fig. 2 and 3, the frequency converter in this embodiment includes a frequency conversion assembly 1, a capacitor plate 2, a plurality of dc bus capacitors 3, a first box 4 and a second box 5, where the first box 4 and the second box 5 are detachably assembled (for example, locked by screws), and the frequency conversion assembly 1 is installed and fixed in the second box 5. The number of the capacitor plates 2, the direct current bus capacitors 3 and the first box 4 can be specifically determined according to actual conditions; for example, the frequency converter comprises a first box 4 and two capacitor plates 2; alternatively, the frequency converter comprises two first housings 4 and four capacitor plates 2.

The first casing 4 of the present embodiment is fixedly mounted on the top of the second casing 5; in practical application, the opening of the second box 5 is preferably directly closed by the first box 4, so that a cover plate or a switch door plate for sealing the opening of the second box 5 is not required, the structural design of the frequency converter is simplified, parts are reduced, the manufacturing cost is reduced, assembly and assembly are facilitated, and the manufacturing efficiency is improved.

Further, the capacitor plate 2 is fixed on the first box 4, and the capacitor plate 2 is electrically connected to the frequency conversion module 1 in the second box 5 in a detachable manner through a conductive member 7 (e.g., a conductive copper bar). The capacitor plate 2 can be installed and fixed in the first box 4, and can also be installed and fixed outside the first box 4, which is determined according to the actual situation; preferentially, fix the installation of electric capacity board 2 in the outside of first box 4, and pack into in the second box 5 through the mode that first box 4 assembled on the second box 5, so not only can improve the space utilization in the second box 5, reduce first box 4 volume simultaneously, still be favorable to electric connection between electric capacity board 2 and the frequency conversion subassembly 1 in the second box 5, shortened the distance and also can reduce the length of conductive member 7, and then reduce conductive member 7's volume, reduce material cost. Of course, the capacitor plate 2 may be mounted in the first case 4, and the conductive member 7 is fixedly connected to the capacitor plate 2 in the first case 4 by passing through the first case 4.

Because the capacitor plate 2 and the conductive member 7 are fixedly connected in a detachable manner (for example, fixed by locking with a screw), the capacitor plate 2 and the conductive member 7 can be detached conveniently, so that the first box 4 can be detached from the second box 5, and the first box 4 is prevented from being fixed on the second box 5 in a limiting manner due to the fact that the capacitor plate 2 and the conductive member 7 cannot be detached.

The plurality of dc bus capacitors 3 are respectively mounted and fixed (for example, welded) on the capacitor plates 2, and the plurality of dc bus capacitors 3 are mounted in the first box 4 by mounting and fixing the capacitor plates 2 to the first box 4. A first heat dissipation air channel is formed in the first box body 4, and a plurality of direct current bus capacitors 3 packed in the first box body 4 are positioned in the first heat dissipation air channel, so that the direct current bus capacitors 3 can be cooled by cooling air flow in the first heat dissipation air channel, and then the direct current bus capacitors 3 are ensured to be respectively kept at lower temperature, so that the service life of the direct current bus capacitors 3 is prolonged, and the performance of the direct current bus capacitors 3 is ensured, therefore, the replacement times of the direct current bus capacitors 3 can be reduced, the utilization rate of the direct current bus capacitors 3 is improved, the maintenance cost can be effectively reduced, and the frequency converter has higher practicability.

Above-mentioned converter is through setting up first box 4 and the second box 5 of assembly an organic whole, thereby can part direct current bus electric capacity 3 and frequency conversion subassembly 1, direct current bus electric capacity 3 accessible first box 4 assembles the top of frequency conversion subassembly 1 with the detachable mode, can be through dismantling first box 4 in order to tear out direct current bus electric capacity 3 together like this, need not to dismantle frequency conversion subassembly 1, and can carry out frequency conversion subassembly 1's maintenance after dismantling first box 4, direct current bus electric capacity 3's maintenance change can be carried out again, therefore, the high operability, and the operation is convenient and fast, direct current bus electric capacity 3's the dismouting degree of difficulty has been reduced, the work efficiency is greatly improved, avoid manpower resources waste.

Moreover, the frequency conversion assembly 1 is not required to be disassembled, so that the installation stability of the frequency conversion assembly 1 in the second box body 5 can be effectively ensured, the problem that the frequency conversion assembly 1 is easily damaged due to frequent disassembly is solved, and the increase of maintenance cost is avoided.

As shown in fig. 4, the frequency converter further includes a fan assembly 6, and the fan assembly 6 is detachably mounted in the first casing 4, so that the fan assembly 6 can be detached from the first casing 4, and the capacitor plate 2 and the dc bus capacitor 3 can be easily detached and maintained. At least two ventilation openings are formed in the side wall of the first box body 4, and the fan assembly 6 and the first heat dissipation air duct are located between the two ventilation openings. Above-mentioned fan assembly 6 can accelerate the cooling air current flow in the first heat dissipation wind channel when operation, and then improves cooling air current's circulation flow efficiency to shift the high-efficient ventilation opening of the heat in the first box 4 and the heat on the direct current bus-bar capacitance 3 to the outside, thereby guarantee that direct current bus-bar capacitance 3 keeps the hypothermia.

In practical application, a radiator can be further arranged in the first box body 4 and connected with the direct current bus capacitor 3, so that the heat of the direct current bus capacitor 3 can be efficiently transferred to the radiator, and then the heat of the radiator is timely transferred to the outside by cooling air flow in the first cooling air duct, and the heat dissipation effect on the direct current bus capacitor 3 is improved. The radiator can be provided with a plurality of radiating fins, and the radiating fins are positioned in the first radiating air duct, so that the radiating area is increased, and the radiating effect is further improved.

In an embodiment of the present invention, the capacitor plate 2 is fixed to the outer side of the bottom plate of the first box 4 by screws, the bottom plate of the first box 4 is provided with a plurality of through holes 41 adapted to the dc bus capacitors 3, and each dc bus capacitor 3 fixed on the capacitor plate 2 is inserted into the first box 4 through one through hole 41. Can set up the heat conduction rubber ring between each direct current bus-bar electric capacity 3 and the through-hole 41 that corresponds, not only can protect direct current bus-bar electric capacity 3, avoid bumping between direct current bus-bar electric capacity 3 and the through-hole 41 inner wall and cause damage or damage, can also shift the heat on direct current bus-bar electric capacity 3 to first box 4 through the heat conduction rubber ring to cool down for direct current bus-bar electric capacity 3.

Specifically, the capacitor plate 2 is provided with a conductive terminal connection position (i.e., the capacitor plate 2 is used for covering a copper contact electrically connected with an external component, and the copper contact is provided with a connection position, for example, a through hole matched with the bolt 21), and the capacitor plate 2 is locked and fixed with the conductive member 7 through the bolt 21 penetrating through the conductive terminal connection position, so as to realize detachable connection between the capacitor plate 2 and the conductive member 7, i.e., the capacitor plate 2 and the conductive member 7 can be separated only by detaching the bolt 21, and the operation is simple and convenient.

In particular, the bottom plate of the first casing 4 is provided with an operation opening 42, and when the capacitor plate 2 is assembled to the bottom plate, the conductive terminal connection site of the capacitor plate 2 is exposed to the operation opening 42, so that the bolt 21 on the conductive terminal connection site can be detached through the operation opening 42, thereby separating the capacitor plate 2 from the conductive member 7, and ensuring that the first casing 4 can be detached from the second casing 5. Because the capacitor plate 2 is located outside the first box 4 and is packed into the second box 5, the operation of detaching the capacitor plate 2 from the conductive member 7 is difficult to be carried out from the joint of the first box 4 and the second box 5, and the operation opening 42 is arranged on the bottom plate, so that the locking and detaching operability is high, the difficulty in dismounting can be effectively reduced, and the working effect is improved.

During assembly, the capacitor plate 2 is assembled on the outer side of the bottom plate of the first box body 4, then the first box body 4 is assembled on the second box body 5, the conductive terminal connecting position of the capacitor plate 2 corresponds to the conductive member 7 fixedly connected with the frequency conversion assembly 1 in the second box body 5, and then the bolt 21 is locked by the operation opening 42 so as to lock and fix the capacitor plate 2 and the conductive member 7, and the assembly is completed. When the first box body 4 is disassembled from the second box body 5, the bolt 21 is only required to be disassembled from the operation opening 42, the operation is convenient and fast, and the practicability is high.

In addition, when the fan assembly 6 is fitted into the first casing 4, the fan assembly 6 covers or partially covers the operation opening 42. Therefore, the fan assembly 6 can seal the operation opening 42, so that dust in the first box body 4 is not easy to accumulate in the capacitor plate 2 and the second box body 5 through the operation opening 42, and accelerated part aging and influence on the heat dissipation effect are avoided.

In another embodiment of the present invention, the fan assembly 6 includes a mounting bracket 61 and at least one heat dissipation fan 62 fixed on the mounting bracket 61, and each mounting bracket 61 is preferably provided with two heat dissipation fans 62.

In addition, the two sides of the mounting bracket 61 are respectively provided with a convex edge 611 which is arranged in a protruding manner, the first box 4 comprises two strip-shaped grooves which are respectively arranged on two opposite side walls of the first box 4, and the two strip-shaped grooves are respectively matched with the convex edges 611 on the two sides of the mounting bracket 61, so that the fan assembly 6 can be assembled in the first box 4 in a manner that the convex edges 611 on the two sides of the mounting bracket 61 are respectively in clamping fit with the strip-shaped grooves on the two side walls. Above-mentioned mounting means can effectively improve fan assembly 6's dismouting efficiency, only need pull fan assembly 6 promptly can tear out first box 4 with fan assembly 6, greatly reduced the maintenance degree of difficulty.

In one embodiment of the present invention, the first casing 4 is rectangular; of course, the shape of the first casing 4 may be determined according to actual conditions.

Specifically, the first box 4 includes a base 43 and a cover which are detachably assembled (for example, by screw locking), the base 43 has a U-shaped cross section, and when the cover is assembled on the base 43, a cavity for assembling the dc bus capacitor 3 is formed between the cover and the base 43. Moreover, the capacitor plate 2 is fixed on one side of the bottom plate of the base 43, which faces away from the cover, and the two strip-shaped grooves are respectively arranged on two side walls of the base 43. The first casing 4 is provided with the base 43 and the cover, which is advantageous for the disassembly and assembly maintenance of the first casing 4, for example, the cover can be removed from the base 43 to expose the operation opening 42, and the disassembly and assembly operation between the capacitor plate 2 and the conductive member 7 can be performed through the operation opening 42.

In particular, the bottom plate of the base 43 is perpendicular to the two strip-shaped grooves, so that the fan assembly 6 can be vertically drawn out when detached, the operation convenience is improved, the space utilization rate in the first box body 4 can be improved, and the condition that the included angle space exists and the fan assembly cannot be effectively utilized is avoided. Moreover, each groove is surrounded by two long convex edges 44 which are distributed at intervals, so that the structure is simple and practical, and the processing and the manufacturing are facilitated; the strip flange 44 may be fixed to both side walls of the base 43 by welding.

The fan assembly 6 of this embodiment assembles the central authorities in the first box 4 with the mode that the direction of blowing set up along the length direction of first box 4, and two lateral walls on the length direction of first box 4 are equipped with the ventilation hole respectively, can increase the effective heat dissipation area in the first box 4 like this, also can guarantee that the velocity of flow of the interior cooling air flow of first heat dissipation wind channel is even, with the circulation flow between the interior cooling air flow of first heat dissipation wind channel and the outside air with higher speed, realize the high-efficient heat dissipation in first heat dissipation wind channel.

And, when direct current bus electric capacity 3 assembled in first box 4 through electric capacity board 2, direct current bus electric capacity 3 distributes between the ventilation hole of two lateral walls of first box 4 and fan assembly 6 to improve layout design's rationality, guarantee the radiating effect to each direct current bus electric capacity 3.

In addition, the frequency conversion assembly 1 comprises a rectification module and an inversion module which are respectively installed in the second box body 5, and the capacitance plate 2 is electrically connected with the inversion module through a conductive component 7.

Specifically, a second heat dissipation air channel is formed in the second box 5, and the rectification module and the inversion module are both located in the second heat dissipation air channel, so that the rectification module and the inversion module can be cooled by the second heat dissipation air channel, so as to ensure that the rectification module and the inversion module keep at a lower temperature.

As shown in fig. 5, in another embodiment of the present invention, the frequency converter includes two first cases 4 and four capacitor plates 2, the bottom plate of each first case 4 is equipped with two capacitor plates 2, and the two capacitor plates 2 are disposed along the length direction of the first case 4. The two first cases 4 are juxtaposed and assembled together, and the two first cases 4 are detachably assembled to the second case 5.

The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention should be covered by the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.

Claims (10)

1. A frequency converter is characterized by comprising a capacitor plate, a plurality of direct current bus capacitors, a first box body and a second box body which are integrally assembled, wherein a frequency conversion assembly is arranged in the second box body;

the capacitor plate is arranged on the first box body, the first box body is arranged on the top of the second box body, and the capacitor plate is electrically connected with the frequency conversion assembly in the second box body in a detachable mode through a conductive member;

a first heat dissipation air channel is formed in the first box body; the direct current bus capacitors are respectively fixed on the capacitor plates, and when the capacitor plates are installed on the first box body, the main body parts of the direct current bus capacitors are located in the first heat dissipation air duct.

2. The frequency converter according to claim 1, further comprising a fan assembly removably mounted within the first box; at least two ventilation openings are formed in the side wall of the first box body, and the fan assembly and the first heat dissipation air duct are located between the two ventilation openings.

3. The frequency converter according to claim 2, wherein the capacitor plate is fixed to the outer side of the bottom plate of the first casing by means of screws, the bottom plate of the first casing is provided with a plurality of through holes adapted to the dc bus capacitors, and each of the dc bus capacitors fixed to the capacitor plate is inserted into the first casing through one of the through holes.

4. The frequency converter according to claim 3, wherein the capacitor plate is provided with a conductive terminal connection site, and the capacitor plate is locked and fixed with the conductive member by a bolt penetrating the conductive terminal connection site; the bottom plate of the first box body is provided with an operation opening, and when the capacitor plate is assembled on the bottom plate, the conductive terminal connecting position of the capacitor plate is exposed to the operation opening.

5. The frequency converter according to claim 4, characterized in that said fan assembly covers or partially covers said operating opening when said fan assembly is fitted into said first box.

6. The frequency converter according to claim 2, wherein the fan assembly comprises a mounting bracket and at least one heat dissipation fan assembled and fixed on the mounting bracket, and both sides of the mounting bracket are respectively provided with a protruding edge; first box includes that two are located respectively on two relative lateral walls of first box, and with the bar groove of chimb looks adaptation, just fan assembly passes through the chimb of installing support both sides is the mode assembly of the bar groove on the joint cooperation two lateral walls respectively in the first box.

7. The frequency converter according to claim 6, wherein the first housing is rectangular; the first box body comprises a base and a sealing cover which are assembled into a whole in a detachable mode, the cross section of the base is U-shaped, and when the sealing cover is assembled on the base, a cavity for assembling the direct-current bus capacitor is formed between the sealing cover and the base; the capacitor plate is fixedly installed on one side, back to the sealing cover, of the bottom plate of the base, and the two strip-shaped grooves are formed in the two side walls of the base respectively.

8. The frequency converter according to claim 7, wherein the two strip-shaped grooves are perpendicular to the bottom plate of the base, and each strip-shaped groove is surrounded by two strip-shaped convex edges distributed at intervals.

9. The frequency converter according to claim 2, wherein the fan assembly is fitted to a center inside the first case in such a manner that a blowing direction is arranged along a length direction of the first case, and both side walls in the length direction of the first case are respectively provided with a vent hole; and when the direct current bus capacitor is assembled in the first box body through the capacitor plate, the direct current bus capacitor is distributed between the ventilation holes in the two side walls of the first box body and the fan assembly.

10. The frequency converter according to claim 1, wherein the frequency conversion assembly comprises a rectification module and an inversion module which are respectively installed in the second box body, and the capacitor plate is electrically connected with the inversion module through the conductive member; a second heat dissipation air channel is formed in the second box body, and the rectification module and the inversion module are located in the second heat dissipation air channel.

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