CN217363445U - Variable speed drive support structure - Google Patents

Abstract

A variable speed drive support structure includes a three-sided service cabinet equipped with a forced air cooling system of power and low current components having at least one air cooling loop. The cabinet is divided by at least two separate compartments and an additional compartment unit, with a central air passage between the compartments. The variable speed drive support structure is configured to provide forced air cooling by a single flow of pre-cleaned outside air directed from the top of the cabinet to the bottom thereof through the central air channel. The coolers for the low current elements are spaced along the length of the central air passage, with an air mixing zone designed between the coolers, partially using the internal volume of the coolers. The power supply and the weak current element are designed into a modularized detachable frame structure and are installed in the compartment.

Description

Variable speed drive support structure

Technical Field

The present invention generally relates to systems and apparatus for ensuring reliable operation of a variable speed drive cabinet.

Background

In addition to the power supply devices of electrical devices, auxiliary elements are also important to ensure the reliability and efficiency of such devices. These ancillary components may include cooling systems, dehumidification devices, power supply unit protection, protection from human shock, and other ancillary devices and systems.

In the field of heat exchange, Lepyokhin et al, RU36576(2004), discloses a variable speed drive cabinet. Which includes a choke coil covering an inlet portion of an air circuit connecting the fan unit to the air circuit at a central portion thereof. The fan supplies air to the choke. However, this solution does not provide sufficient cooling for all the units of the apparatus. The design of the air circuit and the input portion of the heat sink does not provide a high level of dust and moisture protection. Furthermore, the design of the air circuit requires additional manufacturing operations. These facts increase the cost of the apparatus.

The vidhakin et al patent RU2239267 discloses a variable speed drive cabinet (2004). The cabinet is an upright rectangular parallelepiped housing with the capability of housing the control, display and power equipment components. The cabinet is equipped with heat sinks including air circuits between the side walls of the enclosure. The cabinet also includes a heat sink embedded in the air circuit. Because of the design of the radiator, the utility model discloses a shortcoming is low including dustproof and moisture proof degree. In addition, in this solution, the cable entry is located in the upper portion of the cabinet above the telemetry system wiring compartment. This configuration reduces the ergonomic parameters of the device and increases the likelihood of mechanical damage to the cable.

U.S. No.9,545,037(B2) "system and method for electric drive cooling" published international classification number int.cl.h05k7/20 on 10.1.2017 discloses a method for forced air cooling of electronic devices. According to the method, the housing is made with at least one sealed compartment, protected from the external environment. The enclosure includes a power supply and low current electronic components connected to a sealed compartment, and at least one heat exchanger. The upper and lower compartments are sealed. The upper and lower compartments contain groups of electrical components. The air passages adjacent the upper and lower sealed compartments form a common wall with the compartments. According to the described method, the cooling system comprises an upper heat exchanger located in the air channel and mounted on the common wall, providing the possibility of air passing through the upper sealed compartment, and a lower heat exchanger unit located in the air channel and mounted on the common wall, providing the possibility of air passing through the lower sealed compartment. Each heat exchanger constitutes an air-to-air cross type heat exchanger having a plurality of channels formed between rows of plates, the central portions of the plates being substantially planar and parallel.

SUMMERY OF THE UTILITY MODEL

The claimed solution aims at solving the technical problem, building a variable speed drive support structure with forced air cooling system and providing efficient cooling of the power supply and the weak current elements. The design is simplified by reducing the size.

Technical results obtained from implementing the claimed variable speed drive support structure are simplified design, reduced size of electrical equipment and improved efficiency of cooling systems for power supplies and low current components, as well as improved air dehumidification efficiency of sealed enclosures of electrical equipment, removing moisture without loss of sealing performance.

Drawings

The drawings illustrate, by way of example, the invention and do not limit the invention. Like reference numerals refer to like elements.

FIG. 1A is a schematic structural view of one embodiment of a variable speed drive support structure having a removable unit;

FIG. 1B is a schematic diagram of a variable speed drive support structure having a passive filter unit and a detachable unit;

FIG. 1C is a schematic structural view of a variable speed drive support structure with a passive filter unit;

FIG. 2A is a schematic structural view of an air cooling system of the variable speed drive support structure;

FIG. 2B is a schematic diagram of a central air channel design of a variable speed drive support structure;

FIG. 2C is a schematic diagram of an air heat exchange circuit within the variable speed drive support structure;

FIG. 3 is a schematic diagram of a thermoelectric device capable of removing moisture from a variable speed drive support structure;

FIG. 4 is a schematic view of the construction of a dust and moisture filter;

FIG. 5 is a schematic view of a dust and moisture filter arrangement at line A-A of FIG. 4;

FIG. 6 is a schematic structural view of another embodiment of an air heat exchanger of the variable speed drive support structure.

Detailed Description

The structure supporting the variable speed drive (fig. 1A; fig. 1B) comprises a three-sided service cabinet 1 designed as an upright cuboid and configured to provide the capability of mounting tools for cooling, filtering, control, indication, power equipment elements and their connections, comprising a unit 2 for mounting power connections and a unit 3 for mounting measuring equipment on the opposite side (fig. 1A-1C). The cabinet 1 may comprise an additional unit 2 for mounting a passive harmonic filter 4 or a filter compensation device or a capacitor bank. Such a unit can be used to improve the reliability of the power plant elements of a variable speed drive. The unit 2 is detachable. For example, the additional unit 2.1 is in the form of a compartment having the same height and depth as the cabinet 1, as shown in fig. 1B. The additional unit 2.1 is configured to be closely aligned with the cabinet 1 of the variable speed drive. Power supply connection 5 (fig. 1B)) is located on one side of the additional unit 2 or 3. All connections between the variable speed drive cabinet 1 and the additional unit 2.1 for mounting passive filters or filter compensation devices or capacitor banks are made inside the embodiment (not shown). Each additional unit 2 may be mounted in a detachable connection with a sealing member, e.g. a polymer member. This solution facilitates transportation and reduces the likelihood of damage to the equipment when it is not transported properly. The compact and ergonomic design provides for quick replacement of components. The design can make full use of the power of the generator and reduce the loss of higher harmonics and reactive current. The use of embedded additional equipment may provide protection against emergency shutdown and turbine rotation. Furthermore, the operator is not forced to install a separate add-on device and configure it to fit the variable speed drive, which may be accompanied by incorrect configuration. It also reduces the length of the power cables and places them in a damage-proof embodiment. Furthermore, it contributes to the modular variable speed drive support structure being easy to use in different installations and operating conditions.

The essence of the invention is a forced air cooling system for the power supply 6 (fig. 1C, 2A) and the low current elements 7 of the variable speed drive support structure, configured to provide cooling by a pre-cleaned external air uniflow 8 leading from the top of the cabinet 1 to its bottom (fig. 2B). The forced air cooling system comprises at least one air cooling circuit. The coolers 9, 10 of the low current element 7 are spaced along the length of the central air passage 11 of the cabinet 1, the hot air 13 and the cold air 14 forming a mixing zone 12. Furthermore, a bypass air channel 15 (fig. 2B) located within the central air channel 11 is arranged above the at least one cooler 9, supplying a cold air flow 14 to the mixing zone 12.

According to a preferred embodiment of the present invention, a bypass air channel 15 is arranged within the central air channel 11 of the variable speed drive support structure and is configured to control the air flow movement by partially closing the inlet opening using a regulating valve 16.

Also according to the invention, the mixing zone 12 of the air flows 13, 14 is arranged in the space between the coolers 9, 10, sharing its inner partial volume. The volume sharing of the coolers 9, 10 is achieved by opening a part of the outer wall of each cooler.

In the claimed forced air cooling system of the variable speed drive support structure, the power supply element 6 is represented by at least one inductor coil. In addition, the coil comprises a solenoid cooled by a directed air flow concentrated in an air passage formed by the coil structure. For example, an air passage may be formed between the polymer housing and the coil of the solenoid by eliminating any movement of said air flow 8 through the coil core.

The low current elements are more preferably located in separate compartments 17. The individual compartments may be sealed and include at least one thermoelectric device 18 (fig. 3) capable of removing moisture from the sealed compartments of the variable speed drive support structure. The thermoelectric device 18 includes a cooling surface 19 and a heating surface 20. The heating surface 20 is arranged in thermal contact with a cooler 21, which cooler 21 is placed inside the air channel 11 in a manner that directs the air flow 8. Air contact for heat exchange between the units 2, 2.1, 3 in the cabinet 1 may be provided by internal air channels of the variable speed drive support structure formed by the unit frame (fig. 2C).

The cabinet 1 comprises a dust and moisture filter 22 (fig. 2A, 4, 5), which filter 22 (fig. 2A, 4, 5) is placed at the air inlet into the cabinet 1 along the first air cooling circuit and comprises a housing comprising a mounting panel 23, angle steel 24 (fig. 5) and a protection plate 25. The protective plate is directed perpendicularly to the direction of the first air cooling circuit at the outlet of the dust and moisture filter and is made in various forms of a directed slope inside the dust and moisture filter 22. The protective plate comprises a dust and moisture proof element in the shape of a curved metal barrier 26. In the second ramp form of the protection plate, the metal barriers are made parallel to each other and perpendicular to the first ramp form of the plate. Each of the first metal barriers 26 is located on the second inclined surface of each of the protection plates for covering a portion of the first air cooling circuit passing between the adjacent protection plates.

The variable speed drive support structure is designed as a cabinet 1 assembled with end-to-end metal plates having bent connection ends forming reinforcing ribs 27, as shown in fig. 2B. The reinforcing ribs 27 improve the design reliability of the variable speed drive. This solution also reduces the metal consumption and improves the manufacturability of its production by using frameless manufacturing techniques of the cabinet 1.

The power supply and low current components of the variable speed drive support structure are designed as a modular removable frame structure 28, mounted within the cabinet 1 compartment. In this manner, the present structure allows for a universal variable speed drive platform for different loads to be formed without changing cabinet design and size.

The variable speed drive support structure further comprises a unit 2.1 for mounting a passive filter 4 or a filter compensation device or a capacitor bank, the unit 2.1 being pre-configured for adapting to the variable speed drive and being detachable in the form of an additional compartment having the same height and depth as the cabinet 1 of the variable speed drive and being configured in close alignment with the variable speed drive cabinet. The unit 2 for mounting the power supply connection 5 is located on one side of the unit 2.1 for mounting the passive filter 4 or the filter compensation device or the capacitor bank, wherein all connections between the variable speed drive cabinet and the unit for mounting the passive filter or the filter compensation device or the capacitor bank are made inside the present embodiment.

The air cooling system of the variable speed drive support structure with sealed compartments comprises an air heat exchanger 29, which air heat exchanger 29 is configured to be cooled with a single flow of pre-cleaned outside air directed from the top of the enclosure to the bottom thereof. A heat exchanger 29 mounted in the cabinet is used to provide heat exchange between a first air cooling circuit 30 and a second air cooling circuit 31. The air heat exchanger is connected to the sealed compartment by an air channel system. The air heat exchanger 29 comprises a set of separate air passages 32 formed by air flow laminar plates 33. Each air flow laminar panel is formed from a single sheet of steel by cold forming or stamping. Wherein the air flow channel is formed between two portions of a single steel plate.

The air cooling system of the variable speed drive support structure with closed compartment comprises at least two cooling circuits 30, 31 limited by the basic elements of the cabinet. The first air cooling circuit 30 (fig. 2A) is configured to interact with the external environment and the second air cooling circuit 31. In the example, air from the outside environment enters through one side of the cabinet 1, passes through the filter 22 into the central channel 11 and exits through the bottom of the cabinet. The second air cooling circuit 31 is configured without the ability to interact with the external environment. The second air cooling circuit 31 comprises a sealed unit 2, 2.1, 3 for mounting the power supply 6 and the low current element 7, a unit 3 for mounting the measuring device, and a unit for mounting the power supply connection 5.

The variable speed drive support structure has a combination of different compartments and detachable units that can be adjusted for different power supply equipment components of different variable speed drives. The structure and its components as a whole ensure reliable operation of the power plant elements of the variable speed drive. Although the present support structure has been described in detail by way of a number of embodiments, additional variations and modifications are possible within the scope and spirit of the technical solution as described and defined in the following claims.

Claims (14)

1. A variable speed drive support structure comprising a three-sided service cabinet designed as an upright cuboid equipped with a forced air cooling system for power supply and low current elements with at least one air cooling circuit;

wherein the cabinet is separated by at least two separate compartments and an additional unit with a central air passage located between the separate compartments;

the variable speed drive support structure is configured to provide forced air cooling by a single flow of pre-cleaned external air directed from the top of the cabinet to the bottom thereof through a central air passage,

wherein the power supply element is mounted at the bottom of the cabinet and is designed to be cooled with a single flow through pre-cleaned external air;

wherein the coolers of said low current elements are separated along the length of the central air passage by air mixing zones which are designed between the coolers sharing part of the internal volume with the coolers.

2. The variable speed drive support structure of claim 1, wherein the cabinet is assembled with end-to-end metal plates having bent connection ends forming reinforcing ribs.

3. The variable speed drive support structure of claim 1, wherein the cabinet comprises at least one additional unit removably attached with a sealing member.

4. The variable speed drive support structure of claim 1, wherein the additional unit is designed in the form of a compartment having the same height and depth as the cabinet.

5. The variable speed drive support structure of claim 1, wherein the central air passage comprises a bypass air passage disposed above the at least one cooler and designed to be in air communication with the mixing zone.

6. The variable speed drive support structure of claim 1, wherein an individual compartment is sealed and comprises at least one thermoelectric device capable of removing moisture from the sealed compartment.

7. The variable speed drive support structure of claim 1, wherein the additional unit is sealed and comprises at least one thermoelectric device capable of removing moisture from the additional unit.

8. The variable speed drive support structure of claim 1, wherein one side of the cabinet comprises a dust and moisture filter for outside air placed at an inlet of the cabinet, wherein the dust and moisture filter is designed as a housing comprising mounting plates, angle iron, and protective plates.

9. The variable speed drive support structure of claim 1, wherein the variable speed drive support structure comprises a sealed compartment connected to an air heat exchanger configured to be cooled with a single flow of pre-cleaned outside air directed from a top to a bottom of a housing,

wherein the heat exchanger comprises a set of separate gas flow channels formed by gas flow laminar plates.

10. The variable speed drive support structure of claim 1, wherein the air cooling system having the sealed compartmentalized structure comprises at least two cooling circuits bounded by essential elements of the cabinet.

11. The variable speed drive support structure of claim 1, wherein the air connection for heat exchange between the additional units of the cabinet is provided by an internal air channel of the variable speed drive structure formed by the frames of the additional units.

12. The variable speed drive support structure of claim 1, wherein

The power supply element is represented by at least one inductor coil which is cooled by a directed air flow concentrated in the air channel formed by the coil structure.

13. The variable speed drive support structure of claim 1, wherein at least a portion of an outer wall of the cooler is open within the air mixing zone.

14. The variable speed drive support structure of claim 1, wherein the power supply and low current elements are designed as modular removable frame structures that are mounted within the compartment.

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