RU189285U1 - Complete cabinet frequency converter - Google Patents

Abstract

The utility model relates to electrical equipment, in particular, to the design of floor-standing frequency converters. The cooling system includes a ventilation grill through which cooling air is taken, a quick-detachable exhaust fan unit with gravity louvers through which the heated air is emitted, which is installed on the roof of the device. The utility model provides a solution to the problem of improving the efficiency of the cooling system.

Description

The utility model relates to electrical equipment, in particular to the design of floor-mounted frequency converters.

An important element in the design of electrical cabinets for electric drives and other devices is the cooling system of operating units. Most of the known technical solutions [1-5] suggest the use of two or more fans, blowers and exhaust fans, and / or other structural elements aimed at cooling the operating device. The installation of additional elements in cabinets reduces the reliability of the devices, as well as increases the overall dimensions of the structure, which is particularly negative in the face of the need to place several electrical cabinets in a confined space. In addition, most of the known solutions in the cooling device use filters that provide dynamic resistance and reduce the efficiency of heat transfer.

Closest to the claimed utility model is a cooling system for instrument and network cabinets [6], which comes from a closed cooling air circuit in an airtight network or instrument cabinet, using an air-water heat exchanger. An air-water heat exchanger is installed in the lower part of the cabinet and is preferably connected to the cold water supply system.

According to the basic idea of the invention, the cooling system contains a duct with air paths of the same length and, thus, the same flow resistances for individual electronic modules in the interior of the cabinet (Tychelmann principle). Thus, to each of the individual modules located one above the other and / or next to each other, supply air of a uniform temperature can be supplied. The inventor claims that the device can work with one fan and even without it. However, the use of an air-water heat exchanger and the creation of air paths complicates the design and its manufacture, is associated with the need for a water source near the place of use of the device, additional maintenance, and also reduces manufacturability and increases the likelihood of failure of the structure.

The electrical cabinet contains an electrical distribution cabinet that is equipped with an independent frequency converter installation area containing a frequency converter mounting device, a thermal radiation fan and an electrical wire, as well as holes that facilitate wiring, the frequency converter mounting device is located in the lower part of the cabinet, the device reference points installation are the installation zones of the frequency converter, and the thermal radiation fan is located above the zone Settings of frequency converter.

The disadvantages of this technical solution is the following:

- the creation of an independent zone for the installation of a frequency converter significantly increases the overall dimensions of the entire structure, which can have negative consequences when it is necessary to install several such cabinets in a limited space;

- low ergonomic characteristics of the installation of the frequency converter, which is connected, firstly, with the need to involve several people for mounting the device, the mass of which averages over 100 kg, and, secondly, with the installation and control of the device in the uncomfortable position of the user, as an independent installation zone and the controls are at the level of human feet, but at the same time, this design embodiment still requires lifting for mounting the frequency converter;

- the use of filters in the cooling system of the device creates a dynamic resistance, which adversely affects the operation of the system.

The claimed utility model is aimed at solving the problem of improving the efficiency of the cooling system.

The solution of the problem is determined by the combination of the following essential features. A complete cabinet frequency converter consists of an electrical cabinet in which a power cell with rail fastening in the cabinet and consisting of a rectifier, DC link capacitors, an inverter, a du / dt filter, a power choke, an input circuit breaker, an EMC filter, connection terminals, earth leakage monitoring system, cooling system. The cooling system includes a ventilation grille, through which the cooling air is taken, a quick-detachable exhaust fan unit with gravity louvers, through which heated air is emitted, mounted on the roof of the device.

The essence of the utility model is explained by the following images:

- FIG. 1 is a front view of a cabinet-type enclosed complete frequency converter with a quick-detachable exhaust fan unit with gravity louvers installed on the roof;

- FIG. 2 shows a front view of an open complete cabinet frequency converter without cabinet components installed on the roof;

- FIG. 3 - quick-release exhaust fan unit with gravity louvers.

The complete frequency converter of the cabinet version (Fig. 1) carries out cooling air intake, which further moves upward inside the case, through the intake ventilation grill, 1, in the lower part of the case. Re-supply of cooling air to the drive is not allowed. Heated air is emitted through gravity blinds, 2.

The handle of the introductory automat, 3, is located above the intake ventilation grille, 1, at a height that provides by means of a chain transmission, 4, its switching by the user in the standing position (Fig. 2).

The quick-release exhaust fan unit with gravity louvers (Fig. 3) is mounted on a special mounting pad, 5 (Fig. 2), located on the roof of the device with screws. The power cell is installed in the upper part of the cabinet, 6.

The installation of the power cell is as follows.

When loading and unloading the cell, the driving mechanism of the power automat is dismantled.

The cell of the electric drive is moved with the help of the cart, which is included in the package. After unloading the cell out of the package and moving it to the electric drive, the eyebolts previously installed on it are turned out. A lifting device is used to load the cell into the drive. This device is installed by the frame, on top of the drive cabinet (Fig. 2), for example, at the installation site, 5, after which the cell is raised. After lifting the cell, it is moved to the sled in the cabinet. Next, fix the cell, remove the lifting device from the cabinet of the electric drive and install the quick-detachable unit of the exhaust fan with gravity blinds. Next, remove the screws securing the cart and holding the cart, remove it from the cell. The cell loading and unloading procedure is identical for electric drives with a lower cable entry and an upper cable entry.

The utility model provides a solution to the problem of improving the efficiency of the cooling system.

The developed design solution with the exclusion of additional fans (placement of one exhaust fan) in the device together with other elements allows to reduce the overall dimensions of the complete cabinet frequency converter to 50% in comparison with the known analogues. Reduces the consumption of materials when creating structures. At the same time, thermal calculations and tests have shown that such a constructive solution ensures reliable operation of the device in an industrial environment. The use of gravity blinds, allows to reduce the dynamic resistance, in addition, they do not need periodic cleaning.

The arrangement of the power cell as well as the handle of the automaton with the help of a chain transmission at the level of the body of the person provides ergonomic indicators of using the device. Convenient design allows the replacement of the cell within 30 minutes.

The quick-detachable fan unit with gravity shutters also allows for quick and convenient replacement and installation of the lifting device.

Achieved protection degree IP21 / IP54.

Information sources

1. Pat. RU 162787, IPC HMM 5/451. High-voltage frequency converter / V. Vishnevsky and others; the applicant LLC NPP "Ekra". - 3. # 2015120151/07; declare 05/27/2015; publ. 06/27/2016.

2. Pat. RU 158897, IPC G12B 15/00, H05K 7/20, HBB 1/56. Device for cooling the inverter cabinet of a frequency converter / V. Vishnevsky and others; the applicant LLC NPP "Ekra". - 3. # 2015129150/05; declare 07/16/2015; publ. 01.20.2016.

3. Pat. RU 2239267, IPC HBB 1/56, H05K 7/20. Cabinet for motor control station / N. Vidyakin, V. Lepekhin, V. Savinov; applicant CJSC "Electron". - 3. No. 2002128181/09; declare 10.23.2002; publ. 05/27/2004.

4. Pat. US 9545037, IPC H05K 7/20. Systems and methods for cooling electric drives / N. J. Tyleshevski et al .; applicant Baker Hughes INC. - Appl. No. US 201514596346; applied 01/14/2015; pub. date 10.01.2017.

5. Pat. CN 104600960, IPC H02M 1/00, H05K 7/20. Jin et al. applicant CSR Zhuzou Electric Locomotive Research Instituteco LTD. - Appl. No. CN 20141153480; applied 04/17/2014; pub. date 15.02.2017.

6. Pat. EP 1614333, IPC H05K 7/20. Ehbermann; applicant Knuerr AG. - Appl. No. EP 20040731358; applied 05/06/2004; pub. date 10/4/2006.

Claims (1)

Cabinet-mounted complete frequency converter consisting of an electrical cabinet in which a power cell with rail mounting in the cabinet and consisting of a rectifier, DC link capacitors, inverter, du / dt filter, line choke, input circuit breaker, EMC filter, connection terminals are placed , a system for monitoring leakage current to the ground, a cooling system, characterized in that the cooling system includes a ventilation grill, through which the cooling air is taken, a quick-detachable exhaust unit Fan with gravity louvers through which the ejection of the heated air, the device installed on the roof.

Images