GB2189592A - Forced-convection oven - Google Patents

Description

GB2189592A 1 SPECIFICATION is wider than the zone 15b at the opposite

edge. A large perforated zone 15c extends Convection oven over the central portion of the plate 15 but extends vertically over the entire height of the The present invention relates to a convection 70 plate, the lower portion, however, having a oven comprising at least one reversible axial wider extension than the upper portion. Un fan provided at a side wall of the oven for perforated zones 15d and 15e are provided circulation of hot air therein, and an air pervi- between the perforated zones 15a-c.

ous protective plate provided in front of the The embodiment of the protective plate 15 fan and having a central, pervious zone, a pershown in Fig. 2 which has perforated and un vious lateral zone along each of its vertical pervious zones has appeared to provide such side edges, and unpervious zones between guiding of the hot air circulated by the fan 16 said central zone and said lateral zones. that a generally uniform temperature distribu Ovens of this kind have reached a wide- tion is obtained throughout the interior of the spread use in restaurant kitchens and similar 80 oven. As is known in the art, a periodic large kitchens, for heating, cooking and bak- switch-over of the direction of rotation of the ing. However, in the ovens used hitherto it fan also contributes to the advantageous re has been a problem to obtain an even temper- sult. It has appeared preferable to control the ature throughout the entire volume of the reversal of the fan in such way that the period oven. An even temperature distribution is a 85 during which the air current from the fan is prerequisite, namely, of obtaining equal treat- directed towards the interior of the oven is ment, and consequently, an even quality of about one third of the period in which the air the prepared product irrespective of its posi- current flows in the opposite direction. The tion in the oven. In spite of the fact that one length of the periods is preferably about one or more heavy fans have been used, no satis- 90 and three minutes, respectively.

factory solution to this problem has been pre sented hitherto. CLAIMS

The object of the present invention is to 1. Convection oven comprising at least one provide a generally even temperature distribu- reversible axial fan (16) provided at a side wall tion in the oven, horisontally as well as verti- 95 of the oven for circulation of hot air therein, cally. This has been obtained by means of an and an air pervious protective plate (15) pro oven of the kind mentioned above which ac- vided in front of the fan and having a central, cording to the invention is generally characterpervious zone (15c), a pervious lateral zone ized in that the central zone extends vertically (15a,15b) along each of its vertical side generally across the entire height of the plate, 100 edges, and unpervious zones (15d,15e) be the lower portion of said central zone having a tween said central zone and said lateral zones, larger area than the upper portion thereof. characterized in that the central zone (15c) ex The invention will be described in more de- tends vertically generally across the entire tail below with reference to the accompanying height of the plate, the lower portion of said drawings, on which Fig. 1 is a front view of a 105 central zone having a larger area than the up- preferred embodiment of the oven according per portion thereof.

to the invention, Fig. 2 is a perspective view 2. Convection oven according to Claim 1, of the same oven on a larger scale and Fig. 3 characterized in that the pervious lateral zone is a plan view on a larger scale of a protec- (15a) disposed adjacent the door (12) of the tion plate provided in the oven. 110 oven is wider than the pervious lateral zone The oven shown in Fig. 1 is generally desig- (15b) at the opposite side edge of the plate.

nated 10 and is provided with a control panel Printed for Her Majesty's Stationery Office 11 and a door 12 which is shown in open by Burgess & Son (Abingdon) Lid, Dd 8991685, 1987.

position. A window 13 is provided in the Published at The Patent Office, 25 Southampton Buildings, door 12. The interior of the oven is shown London, WC2A 1 AY, from which copies may be obtained.

diagrammatically in Fig. 2, in which the door of the oven is removed. As can be seen in the figure, one side wall in the oven is formed by a partially perforated protective plate 15 which is partially cut away in the figure. A fan 16 is provided behind the protective plate 15.

The plate 15 is best illustrated in Fig. 3. In order to provide an even temperature distribution throughout the interior of the oven, the protective plate is provided with perforated portions as well as unpervious portions. Each of the vertical, lateral edges has a perforated zone 15a and 15b, respectively, which extends over the entire height of the plate 15.

The zone 15a adjacent the door of the oven