RU1783253C - Device for leveling pressure difference between room with controllable temperature and the environment - Google Patents

Abstract

SUMMARY OF THE INVENTION: a valve is mounted in a seat and is made in the form of a body of revolution, for example, a ball. The valve guides are angled on either side of the seat with the ability to return the valve to the seat after equalizing the differential pressure. The heating chamber is located on the side of the room. The saddle contains a heating element. The guides have a curved surface and are equipped with a heating element. 2 s.p. f-py, 2 silt,

Description

The present invention relates to refrigeration and can be used in refrigeration chambers and cabinets of commercial refrigeration equipment.

A device is known consisting of a housing installed in a cylindrical hole of a thermally insulated wall.

In the housing 1 of the device there is a frame made of plastic with a rectangular hole. In the bore of the frame on the horizontal axes there are two shutters, which are freely deflectable when exposed to a pressure differential.

A heating element is placed on the outer surface of the frame. The disadvantage of this device is the presence of gaps between the dampers and the walls of the holes / frame of the device, which contributes to an increase in heat influx into the temperature-controlled object

Closest to the proposed device is a differential pressure equalization device in which a more tight overlap of the valve seat is provided, and, as a result, heat gain in the thermostatic volume is reduced.

However, this design of the device has a number of disadvantages:

- design complexity due to the presence of two valves and seats;

- insufficient reliability due to the presence of two hinge pairs in the valves.

The purpose of the invention is to simplify the design and increase the reliability of operation.

This goal is achieved by the fact that in the housing of the device for equalizing the pressure difference between the temperature-controlled object and the environment

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a puppy valve (valve locking member) made in the form of a body of revolution, for example, a ball mounted in the seat with a heating element, and guides are installed on both sides of the seat in its lower part; an additional heating chamber is placed on the housing from the side of the temperature-controlled volume (installed).

The guides have a flat or curved surface with & side of the seat, the rails can be equipped with an additional heater.

In Fig.1 shows the proposed device, in section1 in Fig.2 is a view along arrow A in Fig.1.

In the heat-insulating wall 1 of the thermally controlled (cooled) volume, a cylindrical hole 2 is provided in

which, with the help of flanges 4 and 5, is attached to the housing 3 of the device J

A saddle 8 with adjoining guides 7 is located in the housing

In the seat 8 is located the valve 6 (locking element) Partitions 11,13 and 14 form a chamber. The saddle, the guides and the chamber are equipped with heating elements 9, 10 and 12. The stops 15 are fixed on the guide 7

The device operates as follows: in the absence of a pressure differential between the temperature-controlled volume and the environment, the shut-off element (ball) is located in the saddle. On inclined guides (in a stable equilibrium position), when the temperature in the temperature-controlled volume decreases, the pressure in it decreases and the shut-off element under the influence of the differential the pressure is shifted (rolled) towards the temperature-controlled volume in the directions to the stop 15, opening the passage of atmospheric air through the seat; as the pressure drop decreases, the shut-off element rolls along the inclined guides to the seat v (the pressure equalization closes the seat; when the temperature rises in the temperature-controlled volume, the pressure rises in it and the shut-off element (ball) moves to the atmospheric outlet towards the stop due to the pressure drop 15. This opens the passage in the valve seat. As the differential pressure decreases, the locking member (ball) moves along the guides towards the seat and closes the seat when pressure is equalized.

When the cooled air leaves the temperature-controlled volume and passes through the device, the structural elements are blown by this air, and it is also possible to cool the structure through heat sinks into the temperature-controlled volume.

With the passage of atmospheric air into the interior of the temperature-controlled volume, condensation of moisture from atmospheric air is possible on the cooling surfaces of structural parts1 of guides, seats, ball, etc. When the air exits again from the temperature-controlled volume, condensed moisture may freeze. In order to prevent the foregoing, a number of heaters have been introduced into the design of the device.

5The presence of an additional heating chamber makes it possible to efficiently heat the flow of cold air coming from the temperature-controlled volume

0 The proposed solution has the following advantages compared to the prototype

- in the present invention, one valve (locking member) is used, made in the form of a body of revolution, for example, a ball moving along the guides, and b - two valves rotating on hinges1, this leads to the achievement of both a simpler and more technological design, and increases reliability and the sensitivity of the device under conditions of prolonged operation when exposed to contaminants from the air (from the atmosphere and chamber), dust

5 aerosol, vapors, etc.)

-in the present invention, local heating of the most critical to the appearance of frost and dew parts is used Designs: saddle, guides that

0 contributes to a more reliable operation of the device,

-in the present invention, an additional chamber with heating5 is used at the entrance to it from the temperature-controlled volume, which makes it possible to more efficiently profile air evacuated from the temperature-controlled volume through the leveling device, which generally reduces the power consumed by the heating body compared to power a heater used in the base object and prototype and more effectively prevent the formation of frost and dew on the details of the device.

5 The proposed design of the device for balancing the pressure difference between the inter-deregulated volume and the environment allows to increase reliability and simplify the design of the device.

Claims (3)

1. A device for balancing the differential pressure between a temperature-controlled room and the surrounding atmosphere, comprising a housing, a valve mounted in the seat, a heating element, characterized in that the device further comprises valve guides and a heating chamber, the valve being made in the form of a body of revolution e.g. ball guides 0 the valves are installed at an angle from different sides of the seat with the possibility of returning to the last valve after equalizing the differential pressure, the heating chamber is located on the side of the room, and the seat contains a heating element, 2. The device according to claim 1, characterized in that the valve guides have a curved surface. 3. The device according to paragraphs 1 and 2, with the exception that the valve guides are provided with a heating element Figure 1 Type A FIG. 1