RU2188369C2 - Device for storage of products - Google Patents

Abstract

FIELD: storage of cryogenic and biological products and food-stuff at low temperatures. SUBSTANCE: proposed device includes double- wall reservoir, perforated shield with heat insulation secured on it and adsorbent. Mounted between shield and heat insulation opposite perforations are baffle plates which are secured to surface of shield forming clearances between shield and heat insulation. EFFECT: improved vacuum in layers of shield-vacuum heat insulation; reduced time for attaining required mode of operation; protracted storage of products at low temperatures. 1 dwg

Description

 The invention relates to the field of refrigeration and cryogenic technology and relates to the design and operation of devices for storing cryogenic, food and biological products at low temperatures.

 A device for storing products at low temperatures is known (see EI Mikulin "Cryogenic Technique". Mechanical Engineering, 1969, p. 227).

 The device for storing products contains a double-walled insulated container. As thermal insulation, a multilayer-vacuum thermal insulation is used, located in the inter-wall space. The adsorbent is fixed on the outer surface of the inner wall of the tank, has one-sided cooling from the wall of the tank and ensures the maintenance of vacuum in the inter-wall space during operation of the device.

 The disadvantage of such a device for storing products is the low efficiency of thermal insulation due to insufficient pumping of gases from under the dense layers of thermal insulation.

 Also known is a device for storing products at low temperatures (see, for example, UK patent N 1235866, CL 65 D 81/18 from 1967), selected as a prototype.

 The device for storing products contains a double-walled container, a perforated screen with heat insulation attached to it and an adsorbent.

 To maintain a vacuum in the inter-wall space, the adsorbent is fixed on the inner wall of the tank, which has the temperature of the refrigerant, for example, liquid nitrogen, which ensures that the adsorbent absorbs gas molecules from the inter-wall cavity of the tank. Perforation made in the screen is designed to reduce the distance when pumping gas molecules with an adsorbent from under the layers of thermal insulation attached to the screen. However, the insulation layers adjacent to the screen, due to the pressure differential, seal the perforation holes in the screen and resist the passage of gas molecules to the adsorbent, which increases the time and degrades the efficiency of pumping gas molecules from the insulation layers.

 The disadvantages of the known device for storing products is the inability to provide long-term storage of products due to the ineffective operation of thermal insulation.

 The objective of the present invention is to provide a device for storing products at low temperatures, which would have a highly efficient operation of thermal insulation by improving the evacuation of gases from the insulation layers attached to the screen.

 This is achieved by the fact that in the device for storing products eliminates the sealing of the perforation holes made in the screen due to the installation of visors opposite the perforation holes.

 The essence of the invention lies in the fact that in the device for storing products containing a double-walled container, a perforated screen with heat insulation attached to it and an adsorbent, visors are installed between the screen and heat insulation opposite the perforation holes, forming gaps between the heat insulation and the screen and attached to the surface of the latter.

 The technical result in terms of installing visors between the screen and the insulation opposite the perforation holes with the formation of gaps between the insulation and the screen and attached to the surface of the latter, as well as the mutual structural connection of all the component elements of the device provides high-performance insulation due to improved pumping of gases from the insulation layers fixed to screen, which is confirmed by tests of prototypes made using the proposed technical solution.

 The use of the proposed device for storing products at low temperatures in medicine and animal husbandry for the preservation and preservation of biological materials and preparations will make it possible to give a significant economic effect by ensuring the effective operation of thermal insulation, ensuring long-term storage of products at cryogenic temperature.

 The invention is illustrated in the drawing.

 The device consists of a double-walled tank 1, a perforated screen 2 with thermal insulation 3 fixed on it and adsorbent 4. As thermal insulation 3, for example, EVTI-B screen-vacuum thermal insulation is used, and, for example, CaE zeolite is used as adsorbent 4. Between a screen 2 and thermal insulation 3 opposite the holes 5 of the perforation 6 are installed visors 7, forming gaps 8 between the thermal insulation 3 and the screen 2 and attached to the surface 9 of the screen 2. An interstitial cavity 10 is formed between the outer wall 11 and the inner wall 12 containers 1. Products are loaded and stored in the internal cavity 13 of the container 1 in a cryogenic liquid medium.

 A device for storing products as follows.

A cryogenic liquid, for example, liquid nitrogen, is poured into the internal cavity 13 of the container 1, during which the cooling of the container 1 initially occurs, followed by the filling of the internal cavity 13 to a predetermined level. The adsorbent 4 located on the outer surface of the inner wall 12, when cooled from the inner wall 12 is included in the work. Cooling to the temperature of liquid nitrogen, the adsorbent 4 absorbs gas molecules from the interstitial cavity 10 and thereby increases and maintains the vacuum in the interstitial cavity 10, in which the screen-vacuum thermal insulation 3 is mounted, mounted on a perforated screen 2 and efficiently working under a vacuum of the order of 1 • 10 ^-4 mmHg Art. and higher. When the adsorbent 4 is operating, gas molecules from under the layers of thermal insulation 3 pass through the shortest path through the holes 5 of the perforation 6 to the adsorbent 4.

 The peaks 7, forming the gaps 8, eliminate the sealing of the holes 5 and provide a guaranteed passage of gas molecules from under the layers of thermal insulation 3 to the adsorbent 4, which ensures efficient pumping of gases from the layers of thermal insulation 3, reduces the time of pumping and reaching the effective operating mode of thermal insulation 3 and, therefore, thereby provides long-term storage of products at low temperatures, which performs the task.

Claims (1)

 A device for storing products containing a double-walled container, a perforated screen with heat insulation attached to it and an adsorbent, characterized in that visors are installed between the screen and heat insulation opposite the perforation holes, forming gaps between the heat insulation and the screen and attached to the surface of the latter.