SU941844A1 - Device for heat protection of objects - Google Patents

Description

one

The invention relates to equipment and can be used for thermostatic control and thermal protection of objects.

A device is known for thermal protection of objects with one-sided heat penetration, which are located one in the other chambers, a cavity in which the baths with liquid 1.fo are located

It is also known a device for thermally healed objects, containing inner and outer chambers arranged with a gap in one another and thermal-sensitive elements 2 installed in the gap.

The drawback of the devices is a large thermal inertia.

The purpose of the invention is to reduce the inertia .20

The goal is achieved by the fact that in the lower wall of the inner chamber there is an outlet, the apertures, and the thermosensitive elements are made in the form of strong

backgrounds made from material with shape memory, connected to the appropriate walls and fastened on the wall of the outer chamber. Moreover, the cameras are variable horizontals with a cross section varying in their height.

FIG. 1 shows the proposed device at the time of absence. heat flow slash; On fi. 2 view A on 4ng. I; 4 g. 3 - device at the moment of heat transfer from the walls of the inner chamber to the outer one.

The device contains located about (a ball in the other with the formation of a gap. And L inner II2 and outer 3 chambers, boreholes 4 are made on the bottom wall of the inner chamber. At the same time, there are bellows 5 in the gap I, made of a material having a shape memory and reinforced with a lower base on the wall of the outer chamber 3, and with a vertical base on the column of the inner chamber 2 in the place of the bleeding of the holes 4.

The magnitude of the horizontal cross section of both chambers is reduced in height.

The lower wall of the outer chamber 3 is made of heat insulating material, and the inner surface of the outer chamber 3 and the outer surface of the inner chamber 2 are covered with a reflective material. A vacuum is created to improve the heat insulation between the chambers.

The device works as follows.

If inside chamber 2 the temperature is higher than the temperature of the medium with which chamber 3 contacts, bellows 5 are rectified ML5pots, moving chamber 2 upwards until it comes into contact with the walls of outer chamber 3, and heat from the inner chamber 2 is removed through the side walls to the outside. When the ambient temperature is higher than the temperature in the inner chamber 2, the screens 5 remain compressed and there is no heat exchange between the chambers.

c Thus, the use of temperature-sensitive elements of sylphs from a material that has a shape memory (for example, titanium nickelide) significantly reduces the inertia of the device, since the work performed by them is quite significant (for nickelide titanium, 2.04 kg / m per single volume of splav).

The construction of chambers with a decreasing horizontal cross-section allows an increase in the area of the junction between the chambers, since the contact is made along the entire side surface of the inner chamber, as a result of which the amount of heat transferred to the surrounding environment significantly increases.

Claims (2)

1. A device for thermal protection of objects, containing internal and external chambers arranged with a gap in one another, and temperature-sensitive elements installed in the gap, characterized in that, in order to reduce the inertia, holes are made in the bottom wall of the internal chamber, and the temperature-sensitive elements are in the form bellows made of material with shape memory, connected to the corresponding holes and fixed to the wall of the outer chamber. 2; A device according to claim 1, characterized in that the chambers are made with a variable horizontal cross section, decreasing in their height, Sources of information taken into account in the examination L. USSR Certificate of Autonomy No. 56gS832, cl. F 28 B 15 / BO, 1972. 2. USSR author's certificate No. 568831, cl. F 28T) 15/00, 1972.