RU190389U1 - Heated box for electrical equipment - Google Patents

Abstract

The utility model relates to the field of protection systems measuring electrical equipment from exposure to adverse environmental conditions and can be used when using electrical equipment in extremely low temperature conditions of operation. The technical result of the utility model is an effective design of the heated thermal container, which allows to increase the stability of electrical equipment by providing automatic maintenance necessary operating temperature Via low temperatur.Dlya achieve a technical result of the proposed utility model heated cold box for electrical apparatus, comprising a housing with thermostat, thermal containers and control device connected thereto a diode junction. The thermal container is additionally equipped with an upper hinged lid made with the possibility of fixation in the half-open and open positions, with the case and the upper hinged cover in the opening area equipped with side protective covers, inside the case there is a shelf frame consisting of at least two shelves for installing electrical equipment, so that the upper shelf is located in the opening area and on it is installed the control box for the thermal container and connectors for recharging the batteries, and under the upper shelf are placed a diode decoupling device and a thermostat, while heating elements are attached under the bottom shelf. 3 hp f-ly, 2 ill.

Description

The utility model relates to the field of electrical equipment protection systems from exposure to adverse environmental conditions and may find application in the operation of electrical equipment in extremely low temperature operating conditions.

At present, the problem of ensuring acceptable working conditions for the functioning of various types of electrical equipment at low temperature ranges of the environment is of great importance. This is due to the fact that many modern equipment samples are often not frost resistant, which excludes the possibility of their use in extreme temperature conditions (up to minus 40 ° C).

The claimed utility model allows you to build a device that is a heated thermal container that provides acceptable operating conditions for small-sized electrical equipment.

A known design of the device "thermobox T-BOX", designed to protect electronic equipment from exposure to adverse environmental conditions, described in [1]. The T-BOX device is an all-weather, sealed box of small dimensions (240 × 160 × 90 mm), inside of which there is a thermal control board and a radiator, which serves as a mounting surface for the user's equipment. Temperature control is carried out using a thermal relay, automatically maintaining the temperature inside the thermal box from 5 to 15 ° C.

A known construction of a thermobox described in [2]. This model of a compact thermal box (300 × 150 × 146 mm) is radio transparent. Thermoboxing is made of polycarbonate, resistant to UV light and shock, insulated with a layer of polyurethane foam. Thermoboxing is used for installing small equipment in the street: 3G modems, sensors, radio transmitters, etc.

The main drawbacks of the devices [1] and [2] are too small dimensions, which greatly limit the specifics of the electrical equipment used in them to protect against extreme conditions.

The closest in technical essence to the claimed model is adopted as a prototype device for temperature stabilization of electronic units, described in [3].

The device relates to thermal control systems and automation and can be used to maintain the operating mode in electronic products and appliances. The essence of the device is that in a small-sized, not exceeding tens of cubic decimeters, a housing with functional electronic units, located in the environment, put a thermostat and a thermostat, two sensors for controlling low and high temperatures, respectively, the programmer of setting the working points of the thermostat, thermostat and switching on the electronic units, the sensors are connected to the programmer, and the control outputs of the programmer are connected to the inputs of the thermostat, thermostat and turning on the electron when the unit reaches the set temperature at the beginning of the lower operating range of the semiconductor components.

The main disadvantages of the prototype device are the complex and excessive composition of electronic components to maintain the operating temperature of the electrical equipment used, as well as the absence of a thermally insulating layer of the housing to maintain the operating temperature inside the housing.

The task, which the proposed model is intended to solve, is to ensure the protection of electrical equipment from external adverse environmental effects (low temperature, dust, precipitation, etc.).

Achievable technical result is the design of the heated thermal container, which allows to increase the stability of the electrical equipment by ensuring the automatic maintenance of the required working temperature under the influence of low temperatures.

The advantages of the proposed solution according to the utility model:

- the ability to build a compact thermal box for various types of compact electrical equipment due to the minimum composition of electrical equipment protection equipment placed inside the container;

- the minimum composition of technical means for maintaining the working temperature inside the thermal container (from 0 to 10 ° C at ambient temperature up to minus 40 ° C) ensures the working conditions of operation during the entire working cycle, typical of most types of electrical equipment.

To solve the problem and achieve these advantages, a model of a heated thermal container with automatic heating is patented, the essence of which is explained by a description of the constructive approach to creating the thermal container and graphic materials that show the structural diagram (Fig. 1) and the appearance (Fig. 2) of the thermal container.

The inventive model allows you to build a heated thermal container, ensuring the operability of electrical equipment in conditions of exposure to low temperatures.

The functional diagram of the heated thermal container is shown in FIG. 1, where the following notation:

1 - thermal container body;

2, 3, 4 - installed units of the electrical equipment;

5 - thermostat;

6 - thermo container control panel;

7, 8 - heaters;

9 - diode isolation device;

10, 11 - batteries.

Externally (Fig. 2), the thermal container has a lightweight, compact, insulating body 1 with a volume sufficient to accommodate used electrical equipment, equipped with transport handles and shoulder straps with adjustable length.

The top flap of the container 12 can be fully opened on the hinges and locked in the open and half open position. The lid has side flaps 13, which protect the upper part of the container from side wind at the half-open position, and provide, together with the front part of the lid, an area of warm air in the control area of the equipment. In addition, the container lid in the half-open position protects electrical equipment from atmospheric moisture and precipitation.

Inside the container has a carrying shelf frame for placement and mounting of electrical equipment and technical components of protection. The shelves have special slots to facilitate air circulation inside the container.

Under the lower shelf two heaters 7, 8 with a power of 40 W each and a supply voltage of 12-16 V are mounted. If necessary, the number of heaters may be different.

On the bottom shelf in the warmest zone are placed two batteries connected in parallel (batteries) 10, 11 with a minimum capacity of 15 a / h each for powering equipment and heaters. Installing the battery in the warmest area prevents loss of capacity due to a decrease in temperature inside the container. The use of lithium-ion batteries is most appropriate because of their high specific energy in mass and volume, lack of maintenance, long service life and high reliability in operation [4]. If necessary, the number of batteries may be different.

Middle shelves are provided for the installation of electrical equipment 2, 3. When installing the blocks between each of them and the walls of the container should be provided clearance for air circulation.

Under the top shelf, a diode decoupler (UDR) 9 is connected, connected to the battery to prevent their mutual discharge and protecting electrical equipment from overvoltage, and a thermostat 5 connected to heaters 7, 8 to automatically maintain the required working temperature inside the container. The thermostat can be designed on the basis of a bimetallic thermostat [5] with a range of switching on and off 0 ° C and 10 ° C, respectively. These conditions are suitable for the operation of most types of non-frost-resistant electrical equipment. If necessary, you can use a programmable thermostat.

On the top shelf there is a thermo container control unit (PCB) 6 connected to the UDR 9, thermostat 5 and installed electrical equipment 2, 3, 4 (in the absence of built-in batteries) for supplying power to the separate blocks and heaters (during the cold season) with the display of the corresponding LED display.

The upper shelf can be used to accommodate additional components of electrical equipment 14 (for example, a control device in the form of a controlling laptop, tablet computer, etc.), as well as other components of electrical equipment 2, 3, 4 in case of insufficient space on the middle shelf. The upper shelf, together with the devices attached to it, can be rotated 90 ° around the horizontal axis toward the front wall 15 of the housing to provide access to electrical equipment in order to monitor and maintain it.

In addition, on the top shelf are the charging connectors of the battery 16 for convenient connection of the charger.

Capacity of heat losses through the walls of the thermal container is [6]:

where: k is the coefficient of thermal conductivity;

S is the surface area of the body of the thermal container;

d is the thickness of the insulating layer;

ΔT is the temperature difference outside and inside the container.

Thus, with a thickness of thermal insulation material of 20 mm and a coefficient of thermal conductivity of 0.04 W / deg m (polyurethane foam or polyethylene foam), as well as the maximum ambient temperature of minus 40 ° C and the temperature inside the container is 0 ° C, the heat loss capacity will be 80 W. Under these conditions, the energy reserve of a fully charged battery will last for 8 hours of continuous operation (taking into account the electrical power supply of the electrical equipment components) when the battery is discharged to 10% of the nominal capacity.

It is also allowed to operate the thermal container with one PI, the capacity of which is sufficient for the above conditions.

If necessary, the time of continuous work of the product at low temperatures can be increased up to 2 times, and the permissible ambient temperature can be reduced by increasing the thickness of the insulating layer of the body of the thermal container.

Thus, the claimed utility model allows you to create a means of effectively ensuring the working conditions of operation of non-frost-resistant electrical equipment.

Information sources:

1. http://www.tfortis.ru/producty/shkafy/terrnoboks-t-b - products of the company "Fort-Telecom".

2. http://termoskaf.ru - products of the company "Electro Systems".

3. RF patent for the invention No. 2341922 “Device for temperature stabilization of electronic units” / Vishnevsky V.M., Tselikin Yu.V., Guzakov N.N., Lakontsev D.V., - 2005.

4. Khrustalev D.A. Accumulators / M .: Izumrud, 2003. - 224 p.

5. http://www.rizur.ru/products/termochehly_shkafy_obogrevateH_kip/termo staty / - products of the RIZUR group of companies.

6. Malyavina E.G. Building heat loss: reference book / EG Malyavina. - M.: AVOK-PRESS, 2007. - 144 p.

Claims (4)

1. Heated thermal container for electrical equipment, comprising a housing with a thermostat, characterized in that a thermal container control panel and a diode decoupler connected to it are inserted, while the thermal container is additionally provided with an upper hinged lid configured to be fixed in the half-open and open positions, the housing and the upper flap in the opening area is equipped with side shields; Inside the case there is a shelf frame, consisting of at least two shelves for installing electrical equipment, so that the upper shelf is located in the opening area and the thermo container control panel and connectors for recharging the batteries are installed on it, a diode decoupler and a temperature controller are located under the upper shelf, under the bottom shelf attached heating elements. 2. Thermal container under item 1, characterized in that the housing has a metal or plastic base. 3. Thermal container under item 1, characterized in that the internal shelf frame has a metal base. 4. Thermal container under item 1, characterized in that the thermostat is designed on the basis of a bimetallic thermostat with a range of on and off from 0 to 10 ° C.

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