FI65485C - VENTIL FOER KYLFOERVARINGSUTRUMMEN - Google Patents

Description

65485

Valve in cold storage rooms s / entil för kylförvaringsutrumme in cold storage rooms and other particularly densely built-up rooms, especially in frozen stores, changes in air pressure due to temperature fluctuations occur. The changes will have a detrimental effect on the structures of the space and the use of the doors.

In order to equalize the air pressure in the storage space to the level of the outside air pressure, various valves are used, which are connected from the outside to the interior by means of a pipe passing through the insulating structure.

One such valve is a valve box with a pipe on the side. The closing element in the box is either table tennis balls or flaps, which with their own weight block the air flow when the pressure difference is small. Such a valve with in-service cold-finger cooling and deflection equipment is disclosed in U.S. Patent No. 3,826,106. One of the weaknesses of this type of valve is its space requirement, since the actual valve box is mounted on the outer surface of the wall.

In another type of valve, the closing member is a spring-loaded flap. Such a structure is represented by the valve disclosed in U.S. Patent No. 3,932,342. It has two spring-loaded metal flaps crosswise in the same plane as a closing member. U.S. Patent No. 3,115,155 discloses a single acting device for pressure equalization. butterfly valve.

One of the weaknesses of the valve structures described above is that they only work properly when installed in a certain position. Another weakness is the high heating power they require when used in the freezer wall, as the entire pipe passing through the insulation structure must be heated to prevent ice formation, or must be equipped with defrosting at frequent intervals.

The device according to the invention is characterized in that in the pipe leading from the frozen or cold space through the insulating structure a distance of 2 ... 4 substantially oblique-shaped flaps of the tubular part are placed at a distance from each other. thermal resistance.

In the following, the device according to the invention will be described mainly with the aid of an image.

2 65485

Fig. J shows a cross-section of a device with one chamber.

in the yard, the device is installed in an opening made in the insulating structure (2).

Attached to the tubular part (I) at its center are two flaps (3 and A), mainly in the form of an oblique section of the pipe. A closed chamber-like space (6) is formed in the space between the flaps. It is preferable to use a round tube as the tube and a substantially elliptical flexible plate as the flap. This construction achieves a good seal between the pipe and the flap. When the valve according to the invention is affected by only a very small pressure difference, a closed chamber (6) is formed in the valve. When the pressure difference becomes large enough, the flaps (3, 4) and the valve allow the air flow to pass through, whereby the pressure equalizes.

When the valve according to the invention is used to equalize the pressure in the freezer compartment, it is provided with 2, 3 or 4 flaps as required, whereby 1, 7 or 3 chamber-like spaces are formed, respectively. In addition, it is provided with one or more heating resistors for heating the chamber. It is particularly advantageous to use one self-adjusting resistor connected in series with other resistors. In this case, an increase in the temperature of the chamber causes an increase in the resistance value of the device, which reduces the heating power. In this way, the temperature of the chambers remains within certain limits, regardless of the ambient temperature of the device.

Because the space to be heated is small, the required heating power is also small. Experience has shown that 10 ... 20% of the power of the corresponding previously known valves is sufficient.

Previously known valves have had to be placed on an insulated wall at the installation site in a place where there is no harm from their protruding parts.

In this way, the valve often becomes located in a place in front of which a wall or other structures are later built, and it is not possible to monitor the operation of the valve without dismantling other structures.

Since the device according to the invention can be installed completely inside the insulating structure, it is installed in a place where there can be no protruding parts, but where the operation of the valve can be easily monitored. The valve according to the invention is therefore particularly well suited for use in the doors of insulated rooms. The operation of the valve placed in the door can always be monitored from inside and outside the isolated space.

Claims (3)

65485 When a heating resistor is required in the valve to prevent ice formation, electric current is also required for the heating resistor which prevents the door seal from freezing. It is therefore advisable to equip the door with a valve at the door factory, in which case the installation of the valve and not the electrical connection need not be performed on the construction site. A flange and grille can be installed at one or both ends of the pipe. The grille prevents foreign objects from entering the valve and also improves the appearance of the valve. It is particularly advantageous to use an internal grille and a low flange, so that there are no harmful protruding parts. p A EXAM CREDIT IM SE SE. T A cover-operated cold storage valve for use in discharging overpressure and underpressure from a cold or freezing space, from which a tubular space (1) leads from the cold or freezing space to an outdoor space through an insulated structure (2), characterized in that at a distance of 2 ... A from each other, a substantially oblique-shaped flap (3, A) of the tubular part, fixed at the center (5) and made of a flexible material, between which a thermal resistor can be placed if necessary. Device according to Claim 1, characterized in that the flap (3, AJ is in two pieces. Device according to Claim 1, characterized in that a thermal resistor is arranged in the space (6) between the flaps.