|Publication number||USRE39309 E1|
|Application number||US 10/072,001|
|Publication date||Oct 3, 2006|
|Filing date||Feb 8, 2002|
|Priority date||Nov 2, 1998|
|Also published as||CN1130543C, CN1253274A, EP0998870A2, EP0998870A3, US5901641, WO2000025646A1|
|Publication number||072001, 10072001, US RE39309 E1, US RE39309E1, US-E1-RE39309, USRE39309 E1, USRE39309E1|
|Inventors||Albert Charles McNamara|
|Original Assignee||Mcnamara Albert Charles|
|Export Citation||BiBTeX, EndNote, RefMan|
|Patent Citations (23), Non-Patent Citations (4), Referenced by (2), Classifications (13), Legal Events (1)|
|External Links: USPTO, USPTO Assignment, Espacenet|
The present invention relates to a deep fryer, and more particularly, to an improved baffle for a deep fryer heat exchanger.
Deep fryers are commercially used by restaurants, institutional kitchens, and fast food establishments for cooking a variety of food products, such as french fries, fish, fried chicken, and the like. The food product is cooked by totally immersing it within a vat or tank that is filled with heated oil or shortening. The oil may be heated using a flow of heated gas that is forced or drawn through a heat exchanger having flow passages that are located within or external to the cooking vat. A gas burner is provided to heat the gas circulating within the heat exchanger. Baffles, such as spiral baffles and disc baffles, have been known to be provided within the flow passages of heat exchangers to increase the turbulent flow of gas and enhance heat transfer.
It is an object of the present invention to provide a baffle for a deep fryer which reduces or wholly overcomes some or all of the difficulties inherent in prior known devices. Particular objects and advantages of the invention will be apparent to those skilled in the art, that is, those who are knowledgeable or experienced in this field of technology, in view of the following disclosure of the invention and detailed description of certain preferred embodiments.
The principles of the invention may be used to advantage to provide a baffle for the heat exchanger of a fryer system which can improve the heat transfer from heated gas flowing through heat transfer conduits of the heat exchanger to shortening contained within a vat.
In accordance with a first aspect, a heat exchanger for a fryer system has at least one heat transfer conduit having a heating fluid passing therethrough. A baffle plate is disposed within the at least one heat transfer conduit and defines a plane. The baffle plate has a first surface, an opposed second surface, and a longitudinal axis dividing the baffle plate into a first portion and a second portion. Each of a plurality of tabs has a longitudinal axis and extends outwardly away from one of the first and second surfaces. The intersection of the tab and the baffle plate defines a crease. At least one of the tabs is positioned in the first portion of the baffle plate and at least one of the tabs is positioned in the second portion of the baffle plate. A plurality of webs are provided with each web separating a tab from other tabs adjacent in a direction substantially perpendicular to the longitudinal axis of the tab.
In accordance with another aspect, a baffle for a heat exchanger has at least one heat transfer conduit with a heating fluid passing therethrough. A baffle plate is positioned in the at least one heat transfer conduit and defines a plane. The baffle plate has a first surface, an opposed second surface, and a longitudinal axis dividing the baffle plate into a first portion and a second portion. Each tab of a plurality of rows of tabs is formed of a portion of the baffle plate bent outwardly from one of the first and second surfaces. Each tab has a longitudinal axis, and defines a crease along an intersection of the tab and the baffle plate. At least one tab in each row is positioned in the first portion of the baffle plate, and at least one tab in each row is positioned in the second portion of the baffle plate. Each row has the crease of all of its tabs form an acute angle with one of a portion of a longitudinal edge of the baffle plate which is upstream, with respect to the flow of heating fluid, of the main body of its respective tab and a portion of the longitudinal edge which is downstream, with respect to the flow of heating fluid of the main body of its respective tab. The rows adjacent to the each row have the crease of all of their tabs form an acute angle with the other of a portion of a longitudinal edge of the baffle plate which is upstream, with respect to the flow of heating fluid, of the main body of its respective tab and a portion of the longitudinal edge which is downstream, with respect to the flow of heating fluid, of the main body of its respective tab. Each web of a plurality of webs separates a tab from another tab adjacent the tab in a direction substantially perpendicular to the longitudinal axis of the tab. The crease of at least one tab is directly downstream, with respect to the flow of heating fluid, of the web between two other tabs which are adjacent and upstream of the at least one tab. The number of tabs per unit length increases along the baffle plate in a downstream direction with respect to the flow of heating fluid.
From the foregoing disclosure, it will be readily apparent to those skilled in the art, that is, those who are knowledgeable or experienced in this area of technology, that the present invention provides a significant technological advance. Preferred embodiments of the baffle for a deep fryer heat exchanger can provide increased turbulence and enhanced heat transfer within the flow passages of the heat exchanger. These and additional features and advantages of the invention disclosed here will be further understood from the following detailed disclosure of certain preferred embodiments.
Certain preferred embodiments are described in detail below with reference to the appended drawings wherein:
The figures referred to above are not drawn necessarily to scale and should be understood to present a representation of the invention, illustrative of the principles involved. Some features of the baffle depicted in the drawings have been enlarged or distorted relative to others to facilitate explanation and understanding. The same reference numbers are used in the drawings for similar or identical components and features shown in various alternative embodiments. Baffles, as disclosed herein, will have configurations and components determined, in part, by the intended application and environment in which they are used.
A baffle plate 40 having a longitudinal axis L is shown in FIG. 3. Plate 40 has a plurality of tabs 42 extending outwardly from each of first surface 43 and second surface 45 of plate 40. Tabs 42 preferably extend outwardly at an acute angle with respect to the surface from which they extend. More preferably, tabs 42 extend outwardly at an angle of 45° with respect to the surface from which they extend. Each tab 42 has a longitudinal axis A which is perpendicular to crease 44. In a preferred embodiment, each tab 42 is formed by cutting plate 40 and bending a portion of plate 40 outwardly, forming crease 44 at the joint where tab 42 is bent away from plate 40. Although tabs 42 may be formed by securing separate pieces of material to plate 40, such as by welding, in which case crease 44 would extend along the line of intersection of tab 42 and plate 40, forming tabs 42 by bending a portion of plate 40 outwardly removes the welds as a potential point of failure of plate 40. Web 46 is the portion of plate 40 which remains between tabs 42 adjacent to one another in a direction substantially perpendicular to longitudinal axis A. In the embodiment illustrated in
As seen in
As illustrated in the embodiment shown in
In certain preferred embodiments, a firebox (not shown) housing the flame produced by the burning gas is provided in burner section 11. In other preferred embodiments, there is no firebox and the flame extends directly into a single heat transfer tube 16, preferably having a circular cross section. In embodiments without a firebox, tabs 42 of plates 40 enable more complete combustion by causing better mixing of the gas and air within the single heat transfer tube 16. Additionally, where three or more plates 40 are positioned within heat transfer tube 16, the centermost plates, which reach higher temperatures since they are further from the lower temperature shortening contained in the vat, can improve combustion by reheating cool air which is introduced to the mixture. Tabs 42 and plates 40 can also increase heat transfer through radiation. Such an embodiment is shown in
In another alternative embodiment shown in
Another alternative embodiment is shown in
Yet another alternative embodiment is shown in
Another alternative embodiment is shown in
As shown in
As shown in FIG. 3 and as discussed herein, tabs 42 comprise portions of plate 40 which are bent outwardly away from either first surface 41 or second surface 43 of plate 40. As shown in FIGS. 3 and 6-9, at least one of tabs 42 is positioned in the first portion 54 of plate 40 on one side of the longitudinal axis of plate 40 designated as “L” in FIGS. 3 and 6-9 and at least one other of tabs 42 is positioned in second portion 56 of plate 40 which is on the other side of plate 40's longitudinal axis L.
As shown in
As shown in FIGS. 3 and 6-9, in some embodiments, for the purpose of describing location and distribution of invention elements, a center line of plate 40 may be located where the longitudinal axis is shown located along the center of plate 40. As shown in the figures, in some embodiments tabs 42, holes 58 and tab/hole pairs are arranged so the same are found on both sides of the center line. Further, as shown in the figures and described herein, in some embodiments these elements are also arranged symmetrically in a pattern about the center line. In such embodiments, as shown in the figures, the portion of the plate 40 referred to as first portion 54 is instead referred to as first half 54 and the portion of plate 40 referred to as second portion 56 is instead referred to as second half 56.
As shown in
As shown in
Each tab 42 and its corresponding hole 58, share a common crease 44 and are referred to herein as comprising a “tab/hole pair.” As shown in
As shown in
As shown in FIGS. 3 and 6-9, each row of tabs 42, holes 58 and tab/hole pairs may be comprised of at least two tabs, two holes or two tab/hole pairs, or at least three tabs, three holes and three tab/hole pairs, or at least four tabs, four holes and four tab/hole pairs.
As shown in FIGS. 3 and 6-9, each row has n−1 webs, where n equals the number of tab/hole pairs in the row. If a row is comprised of three tabs and three holes, i.e. three tab/hole pairs, that row has two webs (3 tab/hole pairs−1=2 webs). If a row is comprised of four tabs and four holes, i.e. four tab/hole pairs, that row has three webs (4 tab/hole pairs−1=3 webs).
As shown in
As shown in the Figs., an equal or approximately equal number of tabs, holes, webs, and tab hole pairs may be arranged on either side of the center line of baffle plate 40 on both sides of the baffle plate, which is shown in FIGS. 3 and 6-9 as corresponding with longitudinal axis L. As shown in FIGS. 3 and 6-9, they may be and arranged generally symmetrically about the longitudinal axis L. As shown in
In light of the foregoing disclosure of the invention and description of the preferred embodiments, those skilled in this area of technology will readily understand that various modifications and adaptations can be made without departing from the true scope and spirit of the invention. All such modifications and adaptations are intended to be covered by the following claims:
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|1||*||"Gas Immersion Tubes for Deep Fat Fryers," Research in Fundamentals of Immersion Tube Heating with Gas, Research Bulletin No. 24, AGA Testing Labs, pp. 20-21 (1944).|
|2||Dean Fryer Baffle.|
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|Citing Patent||Filing date||Publication date||Applicant||Title|
|US7398819 *||Nov 12, 2004||Jul 15, 2008||Carrier Corporation||Minichannel heat exchanger with restrictive inserts|
|US20060102332 *||Nov 12, 2004||May 18, 2006||Carrier Corporation||Minichannel heat exchanger with restrictive inserts|
|U.S. Classification||99/403, 126/391.1, 99/375, 99/330|
|International Classification||F28F1/40, F28D1/053, F28F13/12, A47J37/00, A47J37/12|
|Cooperative Classification||F28F13/12, A47J37/1247|
|European Classification||F28F13/12, A47J37/12G2|