US2292192A - Pressure ventilating unit - Google Patents

Description

Aug. 4:, 1942.

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1942- c. o. BERGSTROM 2,292,192

PRESSURE VENTILATING UNIT Filed Sept. 8, 1939 2 Sheets-Sheet 2 H (7. 3 I IQ 1 l x V I9 Patented Aug. 4, 1942 PRESSURE VENTILATING UNIT Carl 0. Bergstrom, Boston, Mass, assignor to B. F. Sturtevant Company, Boston, Mass.

Application September 8, 1939, Serial No. 293,941

4 Claims.

This invention relates to ventilating units and relates more particularly to pressure ventilating units for railway passenger cars.

Pressure ventilating systems utilizing relatively large volumes of outdoor air have been successfully used in many railway passenger cars for cooling the passenger space. Their cost is relatively low as compared to air conditioning systems and they have been found effective substitutes for the latter.

The successful pressure ventilating systems which have been used heretofore, have been similar to these disclosed in the U. 8. Patent No. 2,142,842, which issued January 3, 1939, on an application of M. E. Hanson, and in my copending application, Serial No. 220,681, filed July 22, 1938. In such systems, the centrifugal fans used have been the only stock items used, the ducts and littings being constructed on the jobs at the time of installation. It has been necessary not only to use air duets with such systems, but to cut holes in the car ceiling for the fans and in the sides of the car for the air inlets. As a result, the cost of the equipment used with the fans has greatly exceeded the cost of the fans.

This invention provides a package unit ventilator for the pressure ventilation of railway passenger cars, which may be assembled at the factory complete with filters and auxiliary equipment and which may be mounted as one of the several units from the roof of the car. No ducts are necessary and the only alteration of the car is the provision of air inlets. As a result, the cost of the necessary equipment and of its installation has been greatly reduced.

An object of the invention is to reduce the cost of pressure ventilating systems for railway passenger cars.

Another object of the invention is to provide a self contained pressure ventilating unit for a railway passenger car.

Other objects of the invention will be apparent from the following description taken with the drawings.

The invention will now be described with reference to the drawings, of which:

Fig. 1 is a plan view looking downwardly upon one of the pressure ventilating units embodying this invention, installed in a railway passenger car;

Fig. 2 is an elevation View, of the interior of a car equipped with the unit of Fig. 1 with the roof and floor of the car in section;

Fig. 3 is an enlarged sectional view along the lines 3-3 of Fig. l, and

Fig. 4 is an enlarged sectional view along the lines 44 of Fig. 1.

The unit consists of the centrifugal fan 5 with motor 6, the sheet metal, upper wall I, the sheet metal converging side walls 8 and 9, the vertical, sheet metal, side walls IS, the horizontal lower wall I8, the recirculated air inlet I0, and the filters II. These are all assembled as a unit at the factory.

For installation, it is only necessary to provide the outdoor air inlets I2, for each unit, in the roof of the car, and to mount the hoods I3 on the roof of the car above the inlets.

The walls 8 and 9 not only support the assembly from the roof of the car, but provide air guiding passages for directing the air into the inlet of the fan 5. V

The fan 5 is preferably similar to that disclosed in my Patent No. 2,142,834, which issued January 3, 1939, and the patent discloses all of the details of the embodiment of the fan illustrated herein.

The horizontal lower wall I8 contains a central, circular aperture through which the lower portion of the fan rotor 22 extends below the wall I8 and through which the upper portion of the rotor 22 of the fan extends above the wall I8. The fan 5 is supported around the aperture from the wall I8. The wall I8 is supported by the lower ends of the side walls 8.

The recirculated air inlet It! in the side wall 9 contains the dampers I4 which may be adjusted by the handle 5 to control the amount of recirculated air admitted to the inlet of the fan. A similar recirculated air inlet could be provided in the opposite wall 8 if desired. It is not eX- pected that the recirculated air inlets will be used during the cooling season and they may be omitted as far as cooling is concerned. The same equipment will be used during the heating season, at which time the recirculated air inlets may be desirable.

The upper filter supports I9 are attached to the upper wall I of th unit, above the fan 5 and midway between the air inlet openings I2. The lower filter supports 20 are attached at their outer sides to the lower ends of the side walls 8 and at their inner sides to the bottom wall I8 and serve to support the wall I8 from the walls 8. The upper ends of the side walls 8 are attached to the ceiling of the car adjacent the outer edges of the air inlet openings I2.

The filter supports I9 and 20 are so placed-with respect to the side walls 8 and to each other, and the side walls 8 are so placed with respect to the air inlet openings l2 that the side walls 8 form the outer edges of a W-shaped outline and that the filters II, in the supports I9 and 20, form the inner legs of the W-shaped outline. The inlets I2 are between the inner and outer legs, and the converging side walls 8 forming the outer legs of the outline, form air guiding passages causing the air from the inlets 2 to flow through the filters l I into the inlet of the fan 5.

The filters H are mounted along converging lines for conserving space and may be withdrawn, as illustrated by the dotted lines of Fig. 3, through the doors 11 arranged between th fan 5 and the lower end of the wall 8 on one side, and the lower end of the wall 9 on the other side.

A railway car to be pressure ventilated will have several of the ventilator units embodying this invention spaced along the longitudinal center of the car, and bolted to its roof, the fans collectively drawing in about 4800 cubic feet per minute of outdoor air and discharging it into the passenger space.

While one embodiment of the invention has been described for the purpose of illustration, it should be understood that the invention is not limited to the exact apparatus and arrangement of apparatus described, as departures therefrom may be suggested by those skilled in the art, without departure from the essence of the invention.

What is claimed is:

1. A pressure ventilating unit for a railway passenger car, comprising a casing having side walls with their upper ends adapted for attachment to the roof of said car, and having a lower wall with a central opening, a centrifugal fan supported around said opening by said lower wall and having its rotor extending from a point above to a point below said lower wall, lower filter supports attached at their inner sides to opposite ends of said lower wall and attached at their outer sides to said side walls, said supports serving to support said lower wall and fan from said side walls, and upper filter supports, said supports containing filters forming an inverted V-shaped outline above said fan, said side walls converging towards said lower supports and forming with said filters a W-shaped outline.

2. A pressure ventilating unit for a railway passenger car, comprising a casing having side walls with their upper ends adapted for attachment to the roof of said car, and having a lower wall with a central opening, a centrifugal fan supported around said opening by said lower wall and having its rotor extending from a point above to a point below said lower wall, filter supports attached at their inner sides to'opposite ends of said lower wall and attached at their outer sides to said side walls, said supports serving to support said lower wall and fan from said side walls, and doors in said supports for providing access to the filters therein.

3. A pressure ventilating unit for a railway passenger car, comprising a casing having side walls with their upper ends adapted for attachment to the roof of said car, and having a lower wall with a central opening, a centrifugal fan supported around said opening by said lower wall and having its rotor extending from a point above to a point below said lower wall, lower filter supports attached at their inner sides to opposite ends of said lower wall and attached at their outer sides to said side walls, said supports serving to support said lower wall and fan from said side walls, and upper filter supports, said supports containing filters forming an inverted V-shaped outline above said fan, said side walls converging towards said lower supports and forming with said filters a W-shaped outline, said casing having air inlet openings, one above each of said filters.

4. In combination a railway passenger car and a pressure ventilating unit, comprising a casing having side walls having their upper ends attached to the roof of said car, and having a lower wall with a central opening, attached to said side walls, a centrifugal fan supported around said opening by said lower wall and extending through said opening from a point above to a point below said lower wall, said side walls converging towards said lower wall, filters in said casing supported along lines diverging towards said lower wall and forming with said side walls a W-shaped outline, and air inlet openings in said roof between said side walls and said filters.

CARL 0. BERGSTROM.

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