CH719640A2 - PASSIVE LOW PRESSURE DEVICE FOR COOLING UNDESIRABLY INCREASED TEMPERATURE OR FOR SUPPRESSING FLAME COMBUSTION IN A PROTECTED ELECTRICAL DEVICE - Google Patents

Abstract

The invention relates to a passive low-pressure device for reducing undesirably elevated temperatures or for suppressing flame combustion in protected electrical devices, which is arranged in the protected electrical device and has a carrier (1) within which a compressed cooling medium (3) is present. The carrier (1) is further provided with a filling valve (5) for filling the cooling medium (3) into the carrier (1), a pressure gauge (2) for passive orientation control of the cooling medium in the carrier (1) and a pressure sensor (4). for isolating the protected facility from electrical power and connecting to signaling equipment. The carrier (1) is made of plastic, metal or a metal composition in any hollow closed shape and size and is equipped with at least one temperature detector, e.g. B. with an ampoule (6) made of thermally resistant glass, which breaks in the protected device at the elevated temperature, which damages the carrier (1), and the medium (3) is released into the area of the protected electrical device and which is undesirable elevated temperature cools or suppresses the burning of flames in this protected electrical device. Activation of the device, when the glass ampoule (6) breaks due to the undesirably elevated temperature, creates an opening in the carrier (1) through which the medium is released into the protected electrical device, begins at 50 ° C.

Description

Field of invention

The invention relates to cooling an undesirably elevated temperature or suppressing flame combustion in protected electrical devices, e.g. B. in air conditioning and ventilation devices, gas connections, substations and control panels, in computer boxes, in servers, in telephone exchanges and the like. Undesirable thermal phenomena can occur in these protected electrical devices, the negative effects of which can lead to a gradual loss of functionality or destruction of these devices and, in extreme cases, even to flame combustion. This can be done through various processes such as: B. undesirable chemical reactions, electrical short circuits, overheating of the system, arcing, ignition of operating fluids, etc. can be caused.

Background of the invention

In order to reduce the undesirable increase in temperature or to suppress flame combustion in protected electrical devices, low-pressure devices are suitable. There are automatic low pressure devices for cooling the undesirably increasing temperature or for suppressing flame combustion in protected facilities, which include a cooling medium carrier, the activation of which is based on the rupture of the cooling medium carrier due to the undesirably increasing temperature or a flame combustion created in a protected device. For these devices, the temperature at which the cooling medium carrier is broken cannot be easily controlled to prevent release of the medium into the protected device.

Summary of the invention

[0003] The above-mentioned disadvantage is eliminated and the field of protective equipment is supplemented by a low-pressure device for reducing the undesirably elevated temperature or for suppressing flame combustion in protected electrical equipment, which is arranged in this protected electrical equipment and consists of a support(s). Has a carrier within which a compressed cooling medium is present; the carrier is further provided with a filling valve for filling the cooling medium into the carrier; In addition, the carrier is provided with a pressure gauge for passive orientation control of the cooling medium and with a pressure sensor for disconnecting the protected electrical device from the electrical supply and for connecting to signaling equipment if an undesirably increased temperature is detected within the protected device, the The invention further provides that the carrier is made of plastic or metal or a metal composition in any hollow closed shape and size, the carrier further being equipped with at least one temperature detector, e.g. B. an ampoule made of glass that is resistant to temperature changes. The ampoule of thermally resistant glass is attached to the carrier by one of several methods, e.g. B. screwed, glued, soldered, etc. into the carrier capsule opening. As soon as the temperature in the area of a protected electrical device where a low pressure device is arranged increases to a certain undesirable value, the glass ampoule ruptures, creating an opening in the carrier through which the cooling medium is released into the area of the protected electrical device, and cools down the undesirably elevated temperature or suppresses flame combustion.

[0004] For some types of equipment, the coolant carrier is provided with a sealing connection.

The activation temperature of the device, at which the glass ampoule breaks due to the undesirably elevated temperature and creates an opening in the carrier through which the cooling medium is released into the protected electrical device, is preferably 50 ° C. Glass ampoules are made from glass with different compositions that break at different temperatures ranging from 50°C to 260°C.

The temperature at which the thermal shock resistant glass ampoule breaks can be adjusted by using ampoules with different glass compositions so that the low pressure device activation can be controlled in accordance with the conditions and assumptions of occurrence of the undesirably elevated temperature.

Brief description of the drawings

The invention is described in more detail in the accompanying drawings, in which Fig. 1 shows a side view of a low pressure device for reducing the elevated temperature or for suppressing flame combustion in the protected electrical devices, which includes a glass ampoule, and Fig. 2 is a side view a low pressure device for reducing the elevated temperature or suppressing flame combustion in the protected electrical equipment, comprising five glass ampoules.

Examples of embodiments of the invention

example 1

The passive low pressure device shown in Fig. 1 for reducing an undesirably elevated temperature or for suppressing flame combustion in the protected electrical devices is for arrangement in a protected electrical device such as. B. a smaller substation, the device consisting of a carrier 1, which is made of metal in the form of a hollow cuboid which is closed by welding, the carrier 1 further having a filling valve 5 for feeding the cooling medium 3 into the To fill the carrier 1, in which the cooling medium 3 is pressurized, the carrier 1 is further provided with a pressure gauge 2 for the passive orientation control of the status of the cooling medium 3 in the carrier 1. Furthermore, the carrier 1 is provided with an ampoule 6 made of thermal shock-resistant glass, which is threaded on one side and is screwed into the capsule of the carrier 1, where a threaded opening is made so that the opening is sealed. If the temperature in a protected electrical device, here in this exemplary embodiment at a smaller substation, rises to the undesirable value of 50 ° C, the glass ampoule 6 breaks and thus damages the carrier 1 in which an opening is formed the cooling medium 3 into the area of the protected electrical device, i.e. H. in the area of the smaller substation, it releases and cools down the undesirably elevated temperature in this protected facility. In this way, the passive low-pressure device is activated, with the activation temperature being 50 ° C in this exemplary embodiment. The ampoule 6 made of temperature-resistant glass is made of glass that breaks at a temperature of 50 °C. Furthermore, the device for reducing the elevated temperature or/finally for suppressing flame combustion in a protected electrical device is equipped with a pressure sensor 4 for disconnecting the protected electrical device from the source of electrical supply and for connecting to the signaling device if the given undesirable temperature in the protected electrical equipment is reached.

Example 2

The passive low-pressure device shown in Fig. 2 for reducing an undesirably elevated temperature or for suppressing flame combustion in a protected electrical device is produced for installation in a larger substation, the device consisting of a support 1 made of metal The form of a closed hollow cylinder is produced, which is sealed at both ends with a sealing connection 7, the carrier 1 also being provided with a filling valve 5 in order to fill the cooling medium 3 into the carrier 1, in which the cooling medium 3 is pressurized is, wherein the carrier 1 is further provided with a pressure gauge 2 for passive orientation control of the status of the cooling medium 3 in the carrier 1. Furthermore, the carrier 1 is provided with five ampoules 6 made of glass resistant to temperature changes, which are evenly distributed around the edge, which are threaded on one side and are screwed into the capsule of the carrier 1, where openings with a thread are made, so that the openings are sealed.

At a certain undesirably elevated temperature in a protected facility, in this exemplary embodiment of a larger substation, the glass ampoules 6 break, damaging the carrier 1, an opening being created in the carrier 1 in the area of each broken ampoule 6 and the cooling medium 3 is released into the area of the protected device and it cools down the undesirably increased temperature in the protected device.

The ampoules 6 made of glass resistant to temperature changes are made of glass that breaks at the temperature of 50 ° C, which is the activation temperature of the low-pressure device. In addition, the device for reducing the elevated temperature or for suppressing flame combustion in a protected electrical device is equipped with a pressure sensor 4 for disconnecting the protected electrical device from the source of electrical supply and for connecting to the signaling device if the given undesirable temperature in the protected electrical device is achieved.

[0012] Furthermore, the device for reducing the elevated temperature or for suppressing flame combustion in a protected electrical device is provided with a pressure sensor 4 for disconnecting the protected electrical device from the source of electrical supply and connecting it to the signaling device if the given undesirable temperature is reached in the protected electrical device.

Industrial applicability

The invention can be used in protected facilities, e.g. B. in air conditioning and ventilation devices, gas connections, substations, control panels, in computer boxes, in server boxes, in telephone exchanges and the like.

Reference symbol list

1. Cooling medium carrier 2. Pressure gauge 3. Cooling medium 4. Pressure sensor 5. Filling valve 6. Heat detector - glass ampoule 7. Sealing connection

Claims (2)

1. Passive low pressure device for reducing an undesirably elevated temperature or for suppressing flame combustion in a protected electrical device, which is arranged in the protected electrical device, comprising a carrier (1) in which a compressed cooling medium (3) is provided; wherein the carrier (1) is further provided with a filling valve (4) for filling the cooling medium (3) into the carrier (1); also with a pressure gauge (2) for passive orientation control of the status of the cooling medium (3) in the carrier (1), and with a pressure sensor (5) for disconnecting the protected device from the electrical power source and for connecting to signaling equipment, characterized in that the carrier (1) consists of plastic or metal or a metal composition in any hollow, closed shape and size, the carrier (1) also being equipped with at least one temperature detector, e.g. B. an ampoule (6) made of glass that is resistant to temperature changes, which is attached to the carrier (1) using various mechanical methods, e.g. B. screwed or glued or soldered and the like, so that it seals the openings in the carrier (1), and that after it has broken due to the activation temperature higher than 50 ° C, an opening in the carrier (1) for releasing the cooling medium is formed from the carrier (1) into the area of the protected electrical device to cool the temperature or to suppress flame combustion. 2. Device according to claim 1, characterized in that the carrier (1) is sealed with a sealing connection.