GB Patent 411625 - Improvements in radiators for electric transformer tanks and other purposes

Description

PATENT SPECIFICATION

Application Date: March 17, 1933 No 8072/33.

Complete Left: Feb 27, 1934.

4115625 Complete Accepted: June 14, 1934.

PROVISIONAL SPECIFICATION.

Improvements in Radiators for Electric Transformer Tanks and other Purposes.

We, ST GEORGE's ENGINEERS LIMITED, of Ordsall Lane, Tra'fford Bridge, Salford, County of Lancaster, a British Company, HERBERT PURSLOW, Director with St.

George's Engineers Limited, a British Subject, THE Gw ERAL ELECTRIC COMPANY LIMITED, of Witton, Birmingham, County of Warwick, a British Company, and CHARLES HERBERT Nu NN, Engineer with the General Electric Company Limited, a British Subject do hereby declare the nature of this invention to be as follows:

This invention relates to radiators or similar cooling devices such as are used for cooling the oil of electric transformer tanks and more particularly to improvements in radiators of the type described in the specifications of the prior Patents

Nos 254,600 and 332,065 of St George's Engineers Limited and others having top and bottom headers formed with vertical ducts or passages-through which a current of air passes for the purpose of cooling the tubes of the radiator.

It has already been proposed to construct a radiator for cooling the oil of transformer tanks by arranging the tubes of the radiator around its periphery and to blow air through an aperture in the bottom header into the free space around which the tubes are arranged.

The cooling of the tubes of radiators of the type described in the hereinbefore mentioned specifications is in some cases found to be insufficient and the object of the present invention is to provide such radiators with means whereby a current of air can be blown or forced through the vertical duct or ducts in -the headers thereby increasing the efficiency of the cooling of the tubes.

According to the invention a radiator' of the type to which the invention relates is provided with a secondary header connected directly or by means of tubes or pipes with the vertical duct or ducts in the bottom header, air under -pressure being forced or blown into the secondary header and from thence through the duct or ducts in the bottom header to the surfaces of the radiator tubes.

In one form of the invention the lPrice 1 �-l e 4 64 secondary header, which may be of tubular, box or other shape, is arranged 55 below the bottom header, the ducts in which are connected by pipes or tubes or Lby extensions of the ducts with the secondary header The secondary header is fitted with a branch pipe or flange by 60 which it can be connected with a pipe or duct from a fan or blower for supplying the air.

In another form of the invention the secondary header is welded, bolted or 65 otherwise affixed directly to the underside of the bottom header, the vertical ducts in the latter opening out of the secondary header In this construction also the secondary header is constructed 70 with a branch pipe or flange by which it can be connected to the pipe or duct from the fan or blower.

The secondary air header may be of any desired shape to suit the construction and 75 shape of the bottom header to which it is applied and also to suit the position in which the cooling apparatus operates In some cases the secondary headers may be constructed with their bases sloping in 80 one or two directions or with a hopper shaped bottom sloping in four directions.

A drain hole may be arranged at the lowest part of the secondary header for the purpose of draining off any water 85 collecting therein.

By the direct attachment of the secondary header to the bottom header a smaller fan or blower is necessary for the required blast of air through the ducts 90 into the radiator as the passage of the air is not impeded by having to pass through connecting tubes from the secondary header to the ducts in the bottom header, and due to the general increased efficiency 95 obtained.

To further increase the cooling of the radiator tubes by the blast of air passing up through the air ducts in the bottom header, these air ducts may be extended 100 vertically up amongst the radiator tubes.

Such extended air ducts or tubes may be of varying lengths so as to control the point or points of outlet of the forced blast of air to obtain the greatest effi 105 ciency Further, these extended air ducts T,,p fl -,g r', r, h C L t 11111 Ll or tubes may be perforated for the whole or for a part (preferably the upper part) of their length and the outlet at the top thereof may be choked or restricted to ensure that some of the air will be forced out laterally through the perforations or holes which if desired may be inclined in the direction of the flow of the air.

to Although the invention primarily relates to radiators for cooling the oil of electric transformers it is also applicable for other cooling or heating purposes.

In the latter case a blast of hot air is supplied to the secondary header.

Dated this 16th day of March, 1933.

J OWDEN O'BRIEN & SON, Late W P Thompson & Co, of Manchester, Patent Agents.

COMPLETE SPECIFICATION.

Improvements in Radiators for Electric Transformer Tanks and other Purposes.

We, ST GEORGE's ENG In ERS LIMI-TED, of Ordsall Lane, Trafford Bridge, Sal ford, County of Lancaster, a British Company, HERBERT Pu Rstow, Director with St.

George's Engineers Limited, a British Subject, THE GENERAL ELECTRIC COMPANY LIMITED, of Witton, Birmingham, County of Warwick, a British Company, and CHARLES HERBERT NUNN, Engineer with the General Electric Company Limited, a British Subject, do hereby declare the nature of this invention and in what manner the same is to be performied, to be particularly described and ascertained in and by the following statement:-

This invention relates to radiators or similar cooling devices such as are -used for cooling the oil of electric transformer tanks and more particularly to improvements in radiators of the type described in the specifications of the Prior Patents

Nos 254,600 and 332,065 of St George's Engineers Limited and others having top and bottom headers formed with vertical ducts or passages through which a current of air passes for the purpose of cooling the tubes of the radiator.

It has already been proposed to construct a radiator for cooling the oil of transformer tanks by arranging the tubes of the radiator around its periphery and to blow air through an aperture in the bottom header into the free space around which the tubes are arranged.

The cooling of the tubes of radiators of the type described in the hereinbefore mentioned specifications is in some cases found to be insufficient and the object of the present invention is to provide such radiators with means whereby a current of air can be blown or forced through the vertical duct or ducts in the headers thereby increasing the efficiency of -the cooling of the tubes.

A coording to the invention a radiator of 60 the type to which the invention relates is provided with an air distributing secondary header connected directly or by means of tubes or pipes with the bottom header air under pressure being forced 65 or blown into the secondary header and from thence through the duct or ducts in the bottom header to the surfaces of the radiator tubes.

The invention will be described with 70 reference to the accompanying drawings in which:Fig 1 is a front elevation partly in section showing the secondary header directly connected to the underside of the 75 bottom header of the radiator.

Fig 2 is a side elevation thereof.

Fig 3 is a plan partly in section from underneath.

Fig 4 is a front elevation showing a 80 modification in which the vertical ducts in the bottom header are carried upwards into the space between the top and bottom headers, the cooling tubes connecting the two headers except those marked C " 85 being omitted from the drawing Fig 5 is a similar view to Fig 4 showing a different arrangement of the vertical ducts.

Fig 6 is a diagrammatic front elevation 90 of the bottom header and the secondary header, the latter being separate from the former and connected to the tubes therein by ducts or tubes.

Fig 7 is a front elevation sbowing a 95 modified shape of the bottom header.

Fig 8 is a plan view of Fig 7.

Fig 9 is a section of one of the vertical ducts shown in Figs 4 and 5.

Fig 10 is a section of a modified con o 00 struction of one of the vertical ducts.

The radiator or cooling device is of usual construction with a top header A 411,625 i i i 411,625 and bottom header B connected together by the vertical tubes 'C which are preferably oval in cross section, both the top header A and the bottom header B being formed with vertical ducts or passages a and b respectively.

In the forms of the invention shown in Figs 1 to 3, Fig 4, Fig -5, Fig 6 and Figs 7 and 8, a secondary header D is welded, bolted or otherwise affixed directly to the underside of the bottom header B, the vertical ducts b in the latter opening out of the secondary header In these constructions also the secondary header D is constructed with a branch pipe or flange d by which it can be connected to the pipe or duct from the fan or blower.

The secondary air header may be of any desired shape to suit the construction and shape of the bottom header to which it is applied and also to suit the position in which the cooling apparatus operates.

In the construction shown in Figs 1 to 3 the secondary header D is formed with its base inclined towards the flange d for connection to the pipe or duct from the fan or blower If desired however the base of the secondary header ID may be inclined in the opposite direction or it may, as shown in Figs 7 and 8, be inclined in two directions or have a hopper shaped bottom the sides of which slope in four directions A drain hole dj may be arranged at the lowest part of the secondary header D for the purpose of draining off any water collecting therein.

By the direct attachment of the secondary header to the bottom header a smaller fan or blower is necessary for the required blast of air through the ducts into the radiator as the passage of the air is not impeded by having to pass throuoh connecting tubes from the secondarv header to the ducts in the bottom header and due to the general increased efficiency obtained by the compactness of the construction Also a smaller blower or fan is required if it is directly connected to the main air trunk supplying air to a battery of coolers.

Instead of the secondary header D being directly affixed to the underside of the bottom header B, it may, as shown in Fig.

6 be arranged some distance below the bottom header B, the ducts b in which are connected by pipes or tubes cd 2 or by extensions of the ducts b with the secondary header D The secondary header D is fitted with a branch pipe or flange d by which it can be connected with a pipe or duct from a fan or blower for supplying the air.

To further increase the cooling of the radiator tubes C by the blast of air passing up through the air ducts b in the -bottom header B, these air ducts may be extended vertically up amongst the radiator tubes C The extended air ducts bl may, as 70 shown in Figs 4 and 5, be of varying lengths so as to control the point or points of outlet of the forced blast of air to Qbtain the greatest efficiency.

Further; the extended air ducts or tubes 75 W may be perforated for the whole or for a part (preferably the upper part) of their length as shown in Figs 9 and 10 and the outlet b 2 at the top thereof may be choked or restricted to ensure that some 80 of the air will be forced out laterally through the perforations or holes b W which if desired may be inclined in the direction of the flow of the air as shown in Fig 10 85 Although the invention primarily relates to radiators for cooling the oil of electric transformers it is also applicable for other cooling or heating purposes In the latter case a blast or hot air is sup 90 plied to the secondary header.

Having now particularly described and ascertained the nature of our said invention and in what manner the same is to be performed, we declare that what we 95