JP2008517240A - Plate heat exchanger - Google Patents

Abstract

A heat exchanger has oil core plates and coolant core plates disposed in alternating, stacked relationship. Flow passages are provided between adjacent plates, so that the oil flow passages alternate with the coolant flow passages, and the oil can flow from an oil inlet opening of each oil plate, and through the oil flow passage to an oil outlet opening, and coolant can flow from a coolant inlet opening of each coolant plate through the coolant flow passage to a coolant outlet opening. The oil inlet openings are adjacent to one end of the plates, and the oil outlet openings are spaced from the oil inlet openings, with a passageway for flow of the oil between upstanding bosses of the coolant plates on opposed sides of each oil plate and extending from a gap in an upstanding flange of the oil plate to the oil outlet opening.

Description

  The present invention relates to a plate heat exchanger for achieving heat transfer between two fluids, for example between a lubricating oil and a liquid coolant.

  Plate heat exchangers with a stack of heat exchanger plates are well known. Such heat exchangers are commonly used to achieve heat transfer between a first fluid, such as the lubricant to be cooled, and a second fluid, such as a liquid coolant.

  There is a need for an improved heat exchanger of this type that is economical to manufacture and that optimizes heat transfer between fluids.

According to the present invention, a plurality of first fluid core plates and a plurality of second fluid core plates are provided, each of the core plates comprising a peripheral portion, a first end, a second A generally flat base having an end, a top surface and a bottom surface; a first fluid inlet opening proximate to the first end of the plate; from the first fluid inlet opening to the second end of the plate A heat exchanger comprising a first fluid outlet opening, a second fluid inlet opening, and an opening in the second fluid spaced apart toward each other;
The first fluid inlet and outlet openings are spaced apart from each other along the plate axis, and the second fluid inlet and outlet openings are located on opposite sides of the plate axis;
A first ridge having an upper surface, each of the first fluid core plates raised relative to the top surface of the base and relative to the first fluid inlet and outlet openings. A first raised portion of the plate proximate to the first fluid inlet opening and a second end of the plate from the first fluid inlet opening. The second end of the first raised barrier portion with respect to the first fluid outlet opening toward the second end of the plate. And a first fluid flow gap that allows the first fluid to flow between the first fluid inlet and the outlet opening is the first raised barrier portion of the first raised barrier portion. 2 ends and the second end of the plate Provided between,
Each of the first fluid core plates further comprises a first recessed barrier portion having a recessed lower surface relative to the bottom surface of the base, the first fluid inlet and outlet openings Are formed in the first recessed barrier portion, the first recessed barrier portion being a first end proximate to the first end of the plate and a second proximate to the second end of the plate. A second fluid flow gap is provided that allows the second fluid to flow between the second fluid inlet and outlet openings through the fluid flow gap, the second fluid flow gap being Spaced from at least one of the second fluid inlet and outlet openings towards the first end of the plate;
Each of the second fluid core plates further comprises a second raised barrier portion having an upper surface raised relative to the top surface of the base, the first fluid inlet and outlet of the second plate An opening is formed in the second raised barrier portion, the second raised barrier portion being a first end proximate to the first end of the plate and a second proximate to the second end of the plate. A second fluid flow gap is provided, the second fluid flow gap having an end and allowing the second fluid to flow through the fluid flow gap between the second fluid inlet and outlet openings. Spaced at least one of the two fluid inlet and outlet openings toward the first end of the plate;
A second recessed barrier wherein each of the second fluid core plates has a lower surface that is recessed relative to the bottom surface of the base and relative to the first fluid inlet and outlet openings. And a second recessed barrier portion spaced apart from the first end adjacent the first fluid inlet and from the first fluid inlet opening toward the second end of the plate. The second end of the second recessed barrier portion is spaced from the first fluid outlet opening toward the second end of the plate, The first fluid flow gap can flow between the first fluid inlet and the outlet opening through the fluid flow gap and the second end of the second recessed barrier portion and the second of the plate Between the ends,
Second fluid cores, wherein the first core plate and the second core plate are alternately stacked and each first fluid core plate is adjacent to form a plurality of fluid flow passages. Sealed around the plate,
The plurality of fluid flow passages comprise a plurality of first fluid flow passages for a first fluid flow, each of the first fluid flow passages being adjacent to a top surface and an upper side of the first fluid core plate. The upper surface of the first raised barrier portion of the first fluid core plate is formed between the bottom surfaces of the second fluid core plate and the second recessed barrier portion of the second fluid core plate The first raised barrier portion gap is in sealed contact with the lower surface of the first fluid passageway, and the first fluid passes from the first fluid inlet opening through the first fluid flow passage and through the gap. In communication with the gap in the second recessed barrier portion so that it can flow to the one fluid outlet opening,
The plurality of fluid flow passages further comprises a plurality of second fluid flow passages for a second fluid flow, each of the second fluid flow passages being on the top surface and upper side of the second fluid core plate. The upper surface of the second raised core portion of the second fluid core plate is formed between the bottom surfaces of adjacent first fluid core plates and the first recessed barrier of the first fluid core plate A gap in the second raised barrier portion is in sealing contact with the lower surface of the portion so that the second fluid passes from the second fluid inlet opening through the second fluid flow passage and through the gap. In communication with the gap in the first recessed barrier portion so that it can flow to the second fluid outlet opening;
The first fluid flow passages alternate with the second fluid flow passages.

  Alternatively, the first fluid can flow in the reverse direction through the first fluid flow passage, in which case the first fluid outlet opening of the plate functions as the first fluid inlet opening, It will be appreciated that the first fluid inlet opening will function as the first fluid outlet opening.

  In order that the present invention may be more clearly understood and more readily put into practice, the present invention will now be described more fully by way of example with reference to the accompanying drawings.

  A preferred embodiment of the invention relates to a plate heat exchanger for achieving heat transfer between a first fluid and a second fluid to be cooled. The first fluid may preferably include a lubricating oil such as natural or synthetic engine oil, a transmission oil or other fluid to be cooled such as a power steering oil or fuel. The second fluid can preferably include a liquid coolant for cooling the oil in the heat exchanger, such as a glycol coolant. Alternatively, at least one of the first and second fluids is, for example, water, deionized water, or a refrigerant, which fluid can be in liquid, gas or two-phase form. In the detailed description that follows, the first and second fluids are referred to as oil and coolant, respectively, and are in the form of a liquid.

  Terms such as “top surface”, “bottom surface”, “upwardly”, “downwardly”, “raised”, “recessed”, etc. are used for the heat exchanger and heat exchange according to the present invention. It is used herein as a reference term for describing the characteristics of the instrument plate. It will be appreciated that these terms are used for convenience only and that the heat exchanger and heat exchanger plate according to the present invention can have any desired orientation when in use.

  The oil core plate 10 will now be described in detail below with reference to FIGS. The oil core plate 10 includes a generally flat, planar base 12 having a top surface 14 and a bottom surface 6. In a preferred embodiment of the present invention, the periphery 18 of the plate 10 comprises an upstanding flange 20 that is spaced from the base 12 such that an obtuse angle exists between the flange 20 and an adjacent portion of the base 12. Inclined outward in the direction. The base 12 has an oil inlet opening 22 proximate to the first end 24 of the plate 10 and an oil outlet opening spaced from the oil inlet opening 22 toward the second end 28 of the plate 10. Part 26. The oil inlet and outlet openings 22, 26 are spaced from each other along a plate axis P that bisects the plate 10 in the longitudinal direction in the preferred embodiment shown in the drawings. However, it will be understood that this axis P does not necessarily bisect the plate 10.

  The plate 10 further comprises a coolant inlet opening 30 and a coolant outlet opening 32 with another opening 34 located between the oil inlet and outlet openings 22, 26 in the preferred embodiment of the drawings. The coolant inlets and outlets 30 and 32 are preferably located on both sides of the plate axis P, and are preferably located close to the second end 28 of the plate 10. Another opening 34 whose purpose will become apparent later is preferably located between the oil inlet and outlet openings 22, 26 and preferably along the plate axis P.

  The base 12 of the oil core plate 10 includes a plurality of protrusions and depressions for directing the heat exchange fluid flow along its top and bottom surfaces 14, 16. In particular, the core plate 10 includes a mechanism that protrudes in the opposite direction from the top and bottom surfaces 14 and 16 thereof. In order to be consistent with the reference terminology used to describe the relative orientation of the plates, this mechanism that protrudes from the top surface 14 of the base 12 is expressed as “raised” while it protrudes from the bottom surface 16. Things are expressed as “depressed”. Again, it will be understood that these terms are used for convenience only. These mechanisms of the oil core plate 10 will now be described in detail below.

  As shown in FIGS. 1 and 5, the top surface 14 of the base 12 is raised relative to the top surface 14 of the base 12 and relative to the oil inlet and outlet openings 22, 26. A first raised barrier portion 36 having The function of this first raised barrier portion 36 directs the oil flow to the oil inlet and outlet openings 22, so as to maximize the use of the plate surface area and thereby provide optimal heat transfer with the coolant. 26 is guided along the top surface 14 of the base 12. This will be explained in detail below.

  The first raised barrier portion 36 is spaced from the first end 40 proximate to the oil inlet opening 22 and from the oil inlet opening 22 toward the second end 28 of the plate 10. And has a second end 42. As will be described in detail below, an oil flow gap 44 through which oil can flow between the oil inlet and outlet openings 22, 26 is a second end of the first raised barrier portion 36. Preferably, it is provided between 42 and the second end 28 of the plate 10.

  As shown in FIGS. 2 and 6, the bottom surface 16 of the base 12 includes a first recessed barrier portion 46 having a lower surface 48 that is recessed relative to the bottom surface 16. The function of this first recessed barrier portion 46 is to direct the coolant flow along the bottom surface 16 of the base 12 between the coolant inlet and outlet openings 30, 32 to optimize heat transfer with the oil. Is to guide. This will be described in detail below.

  The first recessed barrier portion 46 has a first end 50 proximate to the first end 24 of the plate 10 and a second end 52 proximate to the second end 28 of the plate 10. . Both the oil inlet and outlet openings 22, 26 are formed in the lower surface 48 of the first recessed barrier portion 46, and the oil inlet opening 22 is proximate to the first end 50 of the barrier portion 46. The oil outlet opening 26 is preferably located between the first and second ends 50, 52 of the barrier portion 46.

  As shown in the drawings, a first recessed barrier portion 46 extends along the plate axis P, and the coolant inlet and outlet openings 30, 32 are preferably located on opposite sides of the barrier portion 46. At least one coolant flow gap is provided either through the first recessed barrier portion 46 or between the barrier portion 46 and the first end 24 of the plate 10 such that the coolant is at the coolant inlet and As it flows between the outlet openings 30, 32, the coolant can flow across it generally. In the preferred embodiment shown in the drawings, a first coolant flow gap 54 is provided between the first end 50 of the first recessed barrier portion 46 and the first end 24 of the plate 10, The coolant can flow between the coolant openings 30, 32. In order to maximize the length of the coolant flow passage along the bottom surface 16 of the base 12 and thereby optimize heat transfer, the coolant flow gap 54 is located on the plate 10 relative to the coolant openings 30, 32. The gap is open toward the first end 24, preferably the coolant flow gap 54 and the coolant openings 30, 32 are located at both ends of the plate 10.

  The coolant core plate 60 will now be described in detail below with reference to FIGS. The coolant core plate 60 includes a generally flat, planar base 62 having a top surface 64 and a bottom surface 66. In a preferred embodiment of the present invention, the perimeter 68 of the plate 60 comprises an upstanding flange 70 that is spaced from the base 62 such that an obtuse angle exists between the flange 70 and an adjacent portion of the base 62. Inclined outward in the direction. The base 62 is proximate to the first end 74 of the plate 60 and spaced from the oil inlet opening 72 and from the oil inlet opening 72 to the second end 78 of the plate 60, preferably the plate An oil outlet opening 76 is provided along the axis P.

  The plate 60 further comprises a coolant inlet opening 80 and a coolant outlet opening 82 with another opening 84 located between the oil inlet and outlet openings 72, 76 in the preferred embodiment shown in the drawings. The purpose of the opening 84 will be described in detail later. The coolant inlets and outlets 80, 82 are preferably located on both sides of the plate axis P and are preferably located proximate to the second end 78 of the plate 60. Another opening 84 is preferably located between the oil inlet and outlet openings 72, 76, preferably in close proximity to the openings 72, 76 and preferably along the plate axis P.

  The base 62 of the coolant core plate 60 includes a plurality of protrusions and depressions for directing heat exchange fluid flow along its top and bottom surfaces 64, 66. In particular, the core plate 60 includes a mechanism that projects in an opposite direction from its top and bottom surfaces 64, 66. This mechanism protruding from the top surface 64 of the coolant core plate 60, like the oil core plate, is expressed as "raised" while that protruding from the bottom surface 66 is expressed as "recessed". . Again, it will be understood that these terms are used for convenience only. These mechanisms of the coolant core plate 60 will now be described in detail below.

  As shown in FIGS. 3 and 7, the top surface 64 of the base 62 includes a second raised barrier portion 86 having an upper surface 88 that is raised relative to the top surface 64. The function of this second raised barrier portion 86 is to direct the coolant flow between the coolant inlet and outlet openings 80, 82 to the top surface 64 of the base 62 so as to optimize heat transfer with the oil. To guide along. This will be described in detail below.

  The second raised barrier portion 86 has a first end 90 proximate to the first end 74 of the plate 60 and a second end 92 proximate to the second end 78 of the plate 60. Both the oil inlet and outlet openings 72, 76 are formed in the upper surface 88 of this second raised barrier portion 86, and the oil inlet opening 72 is proximate to the first end 80 of the barrier portion 86. Preferably, the oil outlet opening 76 is located intermediate the first and second ends 90, 92 of the barrier portion 86.

  As shown in the drawing, a second raised barrier portion 86 preferably extends along the plate axis P and the coolant inlet and outlet openings 80, 82 are located on opposite sides of the barrier portion 86. At least one coolant flow gap is provided either through the second raised barrier portion 86 or between the barrier portion 86 and the first end 74 of the plate 60 through which the coolant enters the coolant inlet. And when flowing between the outlet openings 80, 82, the coolant can flow across generally. In the preferred embodiment shown in the drawings, a first coolant flow gap 94 is provided between the first end 90 of the second raised barrier portion 86 and the first end 74 of the plate 60, The coolant can flow between the coolant openings 80, 82. In order to maximize the length of the coolant flow passage along the top surface 64 of the base 62 and thereby optimize heat transfer, the coolant flow gap 94 is located on the plate 60 relative to the coolant openings 30, 32. The cooling liquid flow gap 94 and the cooling liquid openings 80 and 82 are preferably located at both ends of the plate 60.

  4 and 8, the bottom surface 66 of the base 62 is recessed relative to the bottom surface 66 of the base 62 and relative to the oil inlet and outlet openings 72, 76. A second recessed barrier portion 96 is provided. The function of this second recessed barrier portion 96 is to direct oil flow between the oil inlet and outlet openings 72, 76 along the bottom surface 66 of the base 62 so as to optimize heat transfer with the coolant. It is to guide. This will be explained in detail below.

  The second recessed barrier portion 96 includes a first end 100 proximate to the oil inlet opening 72 and a second spaced apart from the oil inlet opening 72 toward the second end 78 of the plate 60. End 102. The oil flow gap 104 is preferably provided between the second end 102 of the second recessed barrier portion 96 and the second end 78 of the plate 60, as described in detail below. Through the oil inlet and outlet openings 72, 76.

  From the drawing, the first raised barrier portion 36 of the oil core plate 10 and the second recessed barrier portion 96 of the coolant core plate 60 correspond in size, shape and position and are therefore assembled heat exchangers. It will be appreciated that their respective upper and lower surfaces 38 and 98 are in sealing contact with one another. A preferred mechanism for the first raised barrier portion 36 will now be described with reference to the drawings. Except where indicated to the contrary, the following discussion also applies to the second recessed barrier portion 96 of the plate 60, and the corresponding mechanism of this second recessed barrier portion 96 corresponds to the drawing. Identical to the main reference number.

  Initially, it should be noted from FIGS. 1 and 5 that the first raised barrier portion 36 comprises a first portion 106 and a pair of legs 108, 110. This first portion 106 of the barrier portion 36 is located between the oil inlet and outlet openings 22, 26 and includes a first end 40 of the barrier portion 36. In the preferred embodiment shown in the drawings, this first portion 106 of the barrier portion 36 comprises a raised generally circular rib that surrounds another opening 34 in the oil core plate 10, the outer periphery of which is the oil. Very close to the inlet and outlet openings 22,26.

  As shown in the drawings, the legs 108, 110 of the first barrier portion 36 extend from the first portion 106 of the barrier portion 36 toward the second end 28 of the plate 10. The end portions 112, 114 of the legs 108, 110 are preferably located at the second end 42 of the barrier portion 36 and proximate to the second end 28 of the plate 10, and the oil flow gap 44 is ( Defined by the distance between the terminal ends 112, 114 of the legs 108, 110 (measured parallel to the axis P) and the second end 28 of the plate 10.

  Legs 108, 110 preferably extend along at least a portion of their length along both sides of oil outlet opening 26 and are spaced apart so as to define a channel 116. The axial distance between the terminal ends 112, 114 of the legs 108, 110 and the second end 28 of the plate 10 is preferably greater than the axial distance between the oil outlet opening 26 and the second end 28 of the plate 10. By being small, this channel 116 provides a flow passage that extends from the gap 44 toward the first end of the plate 10, and oil must flow along to reach the oil outlet opening 26. This has the effect of lengthening the flow path between the oil inlet and outlet openings 22, 26, thereby maximizing use of the plate surface area and optimizing heat transfer.

  This flow path 116 is preferably flush with the first fluid outlet opening 26 and the first recessed barrier portion 46, i.e. it is recessed relative to the base 12. In the preferred embodiment shown in the drawings, this channel 116 preferably extends continuously along axis P from the oil outlet opening 26 to the second end 28 of the plate 10.

  As shown in the drawings, a pair of grooves 118 and 120 are formed in the top surface 14 of the plate 10. Each groove 118, 120 extends along the side of one of the legs 108, 110 opposite the flow path 116. The grooves 118, 120 are preferably flush with the channel 116 and each has an end that communicates with the channel 116 at one end 112 or 114 of the legs 108 or 110. Finally, the base 12 of the oil core plate 10 has a pair of upstanding bosses 122 on its top surface 14 having respective upper surfaces 126, 128 in which coolant inlet and outlet openings 30, 32 are formed. 124 is provided. In the preferred embodiment shown in the drawings, the upper surfaces 126, 128 of the bosses 122, 124 are raised relative to the base 12 and relative to the first raised barrier portion 36 for cooling The corresponding coolant inlet and outlet openings 80, 82 of the liquid core plate 60 are flush with its base 62. However, it will be understood that this is not necessarily the case. For example, the upper surfaces 126, 128 of the raised bosses 122, 124 can be flush with the upper surface 38 of the raised barrier portion 36, and the coolant core plate seals with the raised bosses 122, 124. Corresponding recessed bosses (not shown) can also be provided.

  From the drawing, the first recessed barrier portion 46 of the oil core plate 10 and the second raised barrier portion 86 of the coolant core plate 60 are shown below their respective lower and upper sides in the assembled heat exchanger. It will be further appreciated that the dimensions, shape and position correspond so that the surfaces 48 and 88 are in sealing contact. The preferred mechanism of the first recessed barrier portion 46 will now be described with reference to the drawings. Except where indicated to the contrary, the following discussion also applies to the second raised barrier portion 86 of the plate 60, and the corresponding mechanism of this second raised barrier portion 86 is Identical to the main reference number.

  The first recessed barrier portion 46 is comprised of a plurality of bosses, including a first boss 130 in which the oil inlet opening 22 is formed and a second boss 132 in which the oil outlet opening 26 is formed. Please note that. In a preferred embodiment where the plate 10 includes another opening 34, the barrier portion 46 further comprises a third boss 134 located between and in close proximity to the first and second bosses 130, 132. This third boss 134 surrounds another opening 34 and is located radially inward of a generally circular rib comprising the first portion 106 of the first raised barrier portion 36 discussed above.

  As shown in the drawing, the first coolant flow gap 54 is located between the first boss 130 and the first end 24 of the plate 10. The second coolant flow gap 136 is located between the first boss 130 and the third boss 134, and the third coolant flow gap 138 is the second boss 132 and the third boss 134. Located between. The first gap 54 is forced such that most of the coolant flowing from the coolant inlet opening 30 to the coolant outlet opening 32 flows around the first boss 130, thereby moving the coolant. And wider than the second and third gaps 136, 138 to maximize use of the plate surface area and thereby optimize heat transfer.

  As shown in the drawings, the second boss 132 is elongated and extends axially from the oil outlet opening 26 to the second end 28 of the plate 10, thereby damaging the plate between the inlet and outlet openings 30, 32. Prevents short circuited flow of coolant across. It will also be appreciated that this second boss has the same extent as the recessed channel 116 discussed above, formed on the top surface 14 of the plate 10.

  The first recessed barrier portion 46 further comprises a pair of legs 140, 142 to assist in the straight flow of coolant. These legs 140, 142 extend parallel to and very close to the second boss 132 and coincide with the grooves 118, 120 on the other side of the plate 10. Each of the legs 140, 142 has a free end that terminates proximate to an opposing end that connects to the side of the third coolant flow gap 138 and the second boss 132. The legs 140, 142 are spaced from the second boss 132 by a pair of narrow grooves 144, 146 that comprise the underside of the legs 108, 110 formed on the top surface 14 of the plate 10. The grooves 144, 146 are preferably flush with the groove 148 surrounding the third boss 134 that forms the underside of the first portion 106 of the first raised barrier portion 36 described above.

  Referring now to FIGS. 9 and 10 of the drawings, comprising a plurality of oil core plates 10 and a plurality of coolant core plates 60 comprised of one or more metals such as aluminum, stainless steel or copper alloys. A heat exchanger 150 according to the present invention is illustrated. Alternatively, the plate can comprise a non-metallic material such as plastic, which preferably has a high thermal conductivity. The plates 10, 60 are arranged in such a manner that all the plates 10, 60 face in the same direction and the flanges 20, 70 of adjacent plates 10, 60 are hermetically sealed and are in contact with each other and stacked alternately. Provided, thereby sealing the perimeters 18, 68 of adjacent core plates 10, 60 together. In the drawings, all plates 10, 60 of the heat exchanger 150 are shown facing upwards, except for the plates at the top and bottom of the heat exchanger, and each oil core plate 10 has an adjacent cooling on the upper side. Each coolant core plate 60 has its top surface 64 facing the bottom surface 16 of the adjacent oil core plate 10 on the upper side, with its top surface 14 facing the bottom surface 66 of the liquid core plate 60. Only some of the plates making up the heat exchanger 150 are shown in the drawing.

  The bases 12, 62 of the alternating oil and coolant core plates 10, 60 are in spaced relation to each other so as to define a series of alternating oil flow passages 152 and coolant flow passages 154. . The oil flow passage 152 is formed between the top surface 14 of the oil core plate 10 and the bottom surface 66 of the coolant core plate 60 adjacent on the upper side. Similarly, the coolant flow passage 154 is formed between the top surface 64 of the coolant core plate 60 and the bottom surface 16 of the oil core plate 10 adjacent on the upper side.

  From the drawing of the heat exchanger 150, the first raised barrier portion 36 of the oil core plate 10 is in sealing contact with the corresponding second recessed barrier portion 96 of the adjacent coolant core plate 60 on the upper side, It will be appreciated that the barrier portions 36, 96 are in sealing contact along their upper and lower surfaces 38, 98, respectively. As mentioned above, the barrier portions 36, 96 are each raised element (ie, the first portion 106 and the legs 108, 110) that create the barrier portion 36 with a corresponding recessed element (ie, the barrier portion 96). Preferably, the dimensions and shape are the same and are of sufficient height so as to be in hermetic contact with the first portion 106 'and the legs 108', 110 '). In addition, the oil flow gaps 44 and 104 of the respective oil and coolant core plates 10, 60 are aligned, which are the flow paths 116, 116 ′ and grooves 118, 118 ′, 120 and 120 ′ of the respective plates 10, 60. It is done.

  The second raised barrier portion 86 of the coolant core plate 60 is in sealing contact with the corresponding first recessed barrier portion 46 of the adjacent oil core plate 10 on the upper side, the barrier portions 86, 46 being respectively It will also be seen that there is hermetic contact along their upper and lower surfaces 88, 48. Barrier portions 46, 86 are each raised element that creates barrier portion 46 (ie, first boss 130, second boss 132, third boss 134 and legs 140, 142) corresponding ridges of barrier portion 86. Are of the same size, shape and height so as to be in sealing contact with the elements (i.e., first boss 130 ', second boss 132', third boss 134 'and legs 140', 142 ') It is preferable. Further, the respective oils that become the second coolant flow gaps 136, 136 ′, the third coolant flow gaps 138, 138 ′ and the narrow grooves 144, 144 ′, 146 and 146 ′ of the respective plates 10, 60. And the first coolant flow gaps 54 and 94 of the coolant core plates 10, 60 are aligned.

  The bosses 122, 124 formed on the top surface 14 of each oil core plate 10, where the coolant inlet and outlet openings 30, 32 are formed, are relative to the bottom surface 66 of the adjacent coolant core plate 60 on the top It will also be understood that they are sealed along their upper surfaces 126,128. Further, the plates 10, 60 have corresponding openings in each coolant core plate 60 (ie, oil inlet openings 72, oil outlet openings 76, coolant inlet openings 80, coolant outlet openings 82, separate Of each oil core plate 10 aligned with the openings 84) (ie, oil inlet openings 22, oil outlet openings 26, coolant inlet openings 30, coolant outlet openings 32, and other openings). It is sealed together with the opening 34).

  If the plate is made of a metallic material, after assembling the plurality of oil core plates 10 and the plurality of coolant core plates 60 as described above, the assembled plates 10, 60 can be In the form of a cladding, coating or shim plate so as to be disposed in a suitable heating means, thereby providing the sealing contact described above between the plates 10, 60 The brazing metal filler can be provided. The metal plates can also be joined by alternative suitable means such as welding, adhesive bonding, or mechanical assembly using a sealed gasket. Non-metallic plates can be joined by other means such as ultrasonic welding. End plates 156 and 158 that seal the ends of the plate-stack and connect it to the oil and coolant system are shown schematically in the drawings.

  FIG. 9 shows a lower end plate 158 comprising a coolant inlet opening 160 and coolant inlet connector 162 and a coolant outlet opening 164 and coolant outlet connector 166. The coolant inlet opening 160 of the plate 158 communicates with the coolant flow passage 154 and is aligned with the coolant inlet openings 30, 80 of the stacked plates 10, 60. Similarly, the coolant outlet opening 164 of the plate 158 communicates with the coolant flow passage 154 and is aligned with the coolant outlet openings 32, 82 of the plates 10, 60. The aligned inlet openings 30, 80 and aligned outlet openings 32, 82 are closed by the upper end plate 158 at the upper end of the heat exchanger 150.

  As shown in FIG. 10, the lower end plate 158 can be preferably attached to the engine block 168 and the upper end plate can be preferably attached to the oil filter 170. The lower end plate 158 includes an oil inlet opening 172 through which oil enters the heat exchanger 150 from the internal flow passage 174 of the engine block 168. The oil inlet opening 172 of the lower end plate 158 communicates with the oil flow passage 152 and is aligned with the oil inlet openings 22, 72 of the stacked plates 10, 60. Upper end plate 156 includes an oil outlet opening 176 that communicates with an inlet opening 178 of oil filter 170. The oil outlet opening 176 communicates with the oil flow passage 152 and is aligned with the oil outlet openings 26 and 76 of the plates 10 and 60.

  The upper end plate 156 passes through another aligned opening 34, 84 of the stacked plates 10, 60 that together form an oil return passage 182 that is sealed from the oil flow passage 152. Includes an oil return opening 180 that is returned to the engine block 168. The oil return passage 182 communicates with the oil return opening 184 of the lower end plate 158 and the oil return passage 186 of the engine block 168.

  In operation, oil from engine block 168 enters heat exchanger 150 through oil inlet opening 172 in lower end plate 158 and then into the end of one of the aligned oil inlet openings 22, 72. Flows in. Since the other end of the aligned openings 22, 72 is shielded by the upper end plate 156, the oil forces an oil flow passage 152, shown in FIG. 5 by a chain-dotted line. To be passed. In order to flow from the oil inlet opening 22 to the oil outlet opening 26, the oil flows toward the second end 28 of the plate 10 parallel to the first raised barrier portion 36 and through the oil flow gap 44. And must flow along the flow path 116 to the oil outlet opening 26. Thus, the oil must flow over a substantial portion of the base 12 of each plate 10 as it flows from the oil inlet opening 22 to the oil outlet opening 26.

  The oil flowing out of the heat exchanger through the aligned oil outlet openings 26, 76 flows into the oil filter 170 through the oil outlet opening 176 of the upper end plate 156, where the oil passes through the filter media 188, Enter the central tube 190 with holes for return passage 182 and oil return openings 180, 184 to return to the engine block 168. The oil flow through engine block 168, heat exchanger 150 and oil filter 170 is indicated by arrows in FIG. It will be appreciated that in this embodiment the oil is cooled before being filtered.

  Alternatively, the oil flow can be reversed so that it is filtered before being cooled by the heat exchanger 150. In this embodiment, oil flows from passage 186 in engine block 168 into passage 182 in heat exchanger 150. This oil enters oil filter 170 to be filtered through passage 182. The filtered oil then enters the heat exchanger 150 through the opening 176 in the upper end plate 156, exits the heat exchanger through the opening 172 in the lower end plate 158, passes through the passage 174 to the engine block 168. Return.

  In the preferred heat exchanger 150 shown in FIG. 10, the aligned inlet openings 22, 72 are sealed from direct flow communication with the oil filter 170 under all operating conditions, ie, the oil is in the oil filter 170. It must pass through the oil flow passage 152 before entering. Aligned with the inlet openings 22, 72 of the plates 10, 60 and bypass valves (not shown), e.g. active, so that the oil can bypass the heat exchanger and enter the oil filter directly under start-up conditions It may be preferable to provide another opening (not shown) in the upper end plate 156 with a static pressure valve or a thermal relief valve. Such bypass valves are known in the art and do not form part of the present invention. Alternatively, a passive bypass orifice in the form of a calibrated opening in the upper end plate 156 to allow controlled flow of fluid to the oil filter under various conditions. May be preferred.

  As shown in FIG. 9, the coolant passes through the coolant inlet opening 160 of the lower end plate 158 and enters the heat exchanger 150, and then in the end of one of the aligned coolant inlet openings 30, 80. Flow into. Since the other end of the aligned openings 30, 80 is shielded by the upper end plate 158, the cooling liquid forces the cooling liquid flow path 154 according to the path indicated by the dashed line in FIG. It is made to flow. In order to flow from the coolant inlet opening 30 to the coolant outlet opening 32, the coolant flows along the side of the second raised barrier portion 86 toward the first end 24 of the plate 10, and the first The coolant flow gap 54, and then parallel to the other side of the barrier portion 86, toward the second end 28 of the plate 10, and must flow to the coolant outlet opening 32. Thus, when coolant flows from the coolant inlet opening 30 to the coolant outlet opening 32, the coolant must flow over a substantial portion of the base 62 of each coolant core plate 60. It will be appreciated that a relatively small amount of coolant will flow through the second and third coolant flow gaps 136, 138, but this has a minimal impact on the performance of the heat exchanger 150. I will.

  Thus, the heat exchanger 150 according to the present invention achieves a high rate of heat transfer between the oil and the coolant. Of course, it will be understood that the openings 32, 82 may be coolant inlet openings and the openings 30, 80 may be coolant outlet openings. Further, the openings 26 and 76 can function as an oil inlet opening, and the openings 22 and 72 can function as an oil outlet opening.

  The height of each oil flow passage 152 and the height of each coolant flow passage 154 depend in part on the degree of nesting of the alternating plates 10 and thus in part on the tilt angle of the flanges 20, 70. It will also be understood. It will also be appreciated that the height of the flow passages 152, 154 also depends in part on the height of the barrier portions 36, 46, 86, 96 and the height of the bosses 122, 124.

  Arranged in one or more oil flow passages 152 is a turbulizer that may be in a conventional form, such as turbulizer 60 of US Pat. No. 6,244,334 issued June 12, 2001 by Wu et al. And may also be disposed in one or more coolant flow passages 154, these turbulizers being oil or coolant in each of the oil or coolant flow passages 152, 154 in which they are installed. The coolant flow is disturbed and the oil or coolant flow boundary layer is obstructed at the surface of the plates 10, 60, thereby improving the efficiency of heat transfer from oil to coolant in the heat exchanger 150. For clarity, these turbulizers are shown only in FIGS. 5 and 7 and only by the contours indicated by dashed lines 178,180. These turbulizers 178, 180 have a high pressure drop (HPD) flow direction with maximum pressure drop in the oil flow but with a high pressure drop in the oil flow, and there is a turbulence with reduced oil flow but in the oil flow. It has a transverse low pressure drop (LPD) flow direction with a low pressure drop. As desired, the turbulizers 178, 180 can each be disposed in either the HPD or LPD flow direction.

  Instead of using the turbulizers 178, 180, one or more bases 62 of the coolant core plate 60 were published on March 4, 2004 and are hereby incorporated by reference in their entirety. Similar to that shown in FIGS. 1 and 2 of publication No. 2004/0040697 (St. Pierre et al.), Can be formed with spaced projections such as ribs and / or depressions.

  Although the invention has been described in connection with some preferred embodiments, the invention is not limited thereto. Instead, the present invention includes all embodiments that may fall within the scope of the appended claims.

1 is a top perspective view of an oil core plate of a heat exchanger according to a preferred embodiment of the present invention. It is a bottom perspective view of the oil core plate shown in FIG. 2 is a top perspective view of a coolant core plate of a heat exchanger according to a preferred embodiment of the present invention. FIG. FIG. 4 is a bottom perspective view of the coolant core plate shown in FIG. 3. FIG. 3 is a top view of the oil core plate shown in FIGS. 1 and 2. FIG. 3 is a bottom view of the oil core plate shown in FIGS. 1 and 2. FIG. 5 is a top view of the coolant core plate shown in FIGS. 3 and 4. FIG. 5 is a bottom view of the coolant core plate shown in FIGS. 3 and 4. Oil core of a heat exchanger according to a preferred embodiment of the present invention comprising a stack of oil core plates shown in FIGS. 1, 2, 5 and 6 and a plurality of coolant core plates shown in FIGS. FIG. 9 is a cross-sectional view of the plate cut along line 9-9 of FIG. 5 and the coolant core plate cut along line 9′-9 ′ of FIG. Another embodiment of the heat exchanger shown in FIG. 9 with the oil core plate cut along line 10-10 in FIG. 5 and the coolant core plate cut along line 10′-10 ′ in FIG. It is a cross-sectional view.

Claims (27)

A plurality of first fluid core plates and a plurality of second fluid core plates, each of the core plates having a periphery, a first end, a second end, a top surface and a bottom surface. A generally flat base, a first fluid inlet opening proximate to the first end of the plate, spaced from the first fluid inlet opening toward the second end of the plate; A heat exchanger comprising an open first fluid outlet opening, a second fluid inlet opening, and an opening in a second fluid;
The first fluid inlet and outlet openings are spaced from each other along a plate axis, and the second fluid inlet and outlet openings are located on opposite sides of the plate axis;
Each first fluid core plate has a first raised surface having an upper surface that is raised relative to the top surface of the base and relative to the first fluid inlet and outlet openings. A first end portion proximate to the first fluid inlet opening and the second end portion of the plate from the first fluid inlet opening. The second end of the first raised barrier portion with respect to the first fluid outlet opening, the second end of the plate having a second end spaced toward the second A first fluid flow gap that allows the first fluid to flow through the first fluid inlet and outlet openings of the first raised barrier portion. Provided between the second end and the second end of the plate It is,
Each of the first fluid core plates further comprises a first recessed barrier portion having a lower surface that is recessed relative to the bottom surface of the base, the first fluid inlet and outlet openings. Are formed in the first recessed barrier portion, the first recessed barrier portion being proximate to the first end of the plate and the second end of the plate. A second fluid flow gap is provided that allows the second fluid to flow through the fluid flow gap between the second fluid inlet and outlet openings, The second fluid flow gap is spaced toward at least one of the second fluid inlet and outlet openings toward the first end of the plate;
Each of the second fluid core plates further comprises a second raised barrier portion having an upper surface raised relative to the top surface of the base, the first plate of the second plate. Fluid inlet and outlet openings are formed in the second raised barrier portion, and the second raised barrier portion is adjacent to the first end of the plate and the plate. A second fluid flow gap having a second end proximate to the second end and allowing the second fluid to flow between the second fluid inlet and outlet openings through the fluid flow gap. Wherein the second fluid flow gap is spaced toward the first end of the plate with respect to at least one of the second fluid inlet and outlet openings,
Each of the second fluid core plates has a lower surface that is recessed relative to the bottom surface of the base and relative to the first fluid inlet and outlet openings. The plate further comprises a recessed barrier portion, wherein the second recessed barrier portion is a first end proximate to the first fluid inlet and the second end of the plate from the first fluid inlet opening. The second end of the second recessed barrier portion with respect to the first fluid outlet opening, and the second end of the plate with respect to the first fluid outlet opening. A first fluid flow gap spaced apart toward the end and allowing the first fluid to flow between the first fluid inlet and outlet openings is the second recessed barrier portion. Between the second end of the plate and the second end of the plate;
The first fluid core plate and the second fluid core plate are alternately stacked, and each first fluid core plate is adjacent to each other so as to form a plurality of fluid flow passages. Sealed around the fluid core plate
The plurality of fluid flow passages comprise a plurality of first fluid flow passages for the flow of the first fluid, each of the first fluid flow passages being a top surface and an upper surface of a first fluid core plate. Between the bottom surface of the second fluid core plate adjacent to the first fluid core plate, the upper surface of the first raised barrier portion of the first fluid core plate being the first surface of the second fluid core plate. Two indented barrier portions in intimate contact with the lower surface of the first raised barrier portion so that the first fluid flows from the first fluid inlet opening and the first fluid inlet opening. Communicating with the gap in the second recessed barrier portion so that it can flow through the fluid flow passage and through the gap to the first fluid outlet opening,
The plurality of fluid flow passages further comprises a plurality of second fluid flow passages for the second fluid flow, each of the second fluid flow passages being a top surface of the second fluid core plate. An upper surface of the second raised core portion of the second fluid core plate formed between the bottom surfaces of the first fluid core plate adjacent to the upper side of the first fluid core plate; The lower surface of the first recessed barrier portion is in sealing contact with the gap in the second raised barrier portion so that the second fluid is from the second fluid inlet opening and the second fluid inlet opening. In communication with the gap in the first recessed barrier portion so that it can flow through the fluid flow passageway and through the gap to the second fluid outlet opening,
The heat exchanger, wherein the first fluid flow passage alternates with the second fluid flow passage. Each of the first raised barrier portion of the first fluid core plate and the second recessed barrier portion of the second fluid core plate;
A first portion disposed between the first fluid inlet and outlet openings and including the first end of the barrier portion;
The heat exchanger of claim 1, comprising a pair of legs extending from the first portion toward the second end of the plate.   3. The leg of claim 2, wherein the leg has a terminal end located at the second end of the barrier portion, and the terminal end of the leg is proximate to the second end of the plate. Heat exchanger.   An axial distance from the terminal end of the leg to the second end of the plate is shorter than an axial distance from the first fluid outlet opening to the second end of the plate; The heat of claim 3, wherein an axial distance from the terminal end of the leg to the second end of the plate defines a gap between the barrier portion and the second end of the plate. Exchanger.   The heat exchanger of claim 4, wherein the legs are spaced apart from each other and extend at least a portion of their length along opposite sides of the first fluid outlet opening.   The heat exchanger of claim 5, wherein a flow path is defined between the legs, the flow path extending between the first fluid outlet opening and the terminal end of the leg along the plate axis. .   Each of the first and second fluid core plates further comprises a pair of grooves, each extending along a side of one of the legs facing the flow path, one end of the groove The heat exchanger of claim 6, wherein the heat exchanger is located at the terminal end of the leg and communicates with the flow path.   The heat exchanger according to claim 7, wherein the groove is flush with the flow path.   The sealed contact between the first raised barrier portion and the second recessed barrier portion causes the first fluid flowing out of the first fluid inlet opening to flow to the terminal end of the leg and through the gap. Of the respective barrier portion so that it can only enter the first fluid outlet opening by entering the flow path and passing through the flow path towards the first end of the plate. The heat exchanger of claim 6, wherein the heat exchange is provided by a sealing contact between the legs and by a sealing contact between the first portions of the respective barrier portions.   The heat exchanger of claim 5, wherein the flow path is coplanar with the first fluid outlet opening and the first recessed barrier portion.   The heat exchanger of claim 10, wherein the flow path extends from the first fluid outlet opening to the second end of the plate.   The heat exchanger of claim 2, wherein the first portion of the barrier portion comprises a rib that surrounds another opening in the base.   A pair of bosses, each of the first fluid core plates having a raised upper surface relative to the top surface of the base and relative to the first raised barrier portion; The heat exchanger of claim 1, further comprising: the second fluid inlet and outlet openings formed in an upper surface of the boss. Each of the first recessed barrier portion of the first fluid core plate and the second raised barrier portion of the second fluid core plate comprises:
A first boss having an inlet opening for said first fluid formed therein;
The heat exchanger of claim 1, wherein the second fluid inlet opening comprises a second boss formed therein.   The heat exchanger of claim 14, wherein the gap through the barrier portion is located between the first boss and the first end of the plate.   The heat exchanger of claim 14, wherein the second boss is elongated and extends axially from the first fluid outlet opening to the second end of the plate.   15. The third boss of claim 14, further comprising a third boss located between and in close proximity to the first and second bosses, the third boss surrounding another opening in the base. Heat exchanger.   The heat exchanger of claim 17, wherein additional gaps are formed between the first boss and the third boss and between the second boss and the third boss.   The barrier portion further includes a pair of legs extending parallel to and in close proximity to the second boss, each of the legs being aligned with a side of the second boss at one of its ends. The heat exchanger of claim 14, wherein a narrow groove is formed between each of the second boss and the leg.   The peripheral portion of each first fluid core plate and the peripheral portion of each second fluid core plate have an upstanding flange that is inclined outwardly, and the upstanding flange of each plate is the peripheral portion of the plate 20. A heat exchanger according to any one of the preceding claims, wherein the heat exchanger is in nested sealing contact with the upstanding flanges of adjacent plates to provide a sealing of the part.   21. A heat exchanger according to any one of the preceding claims, wherein the sealing contact comprises a brazing contact.   The heat exchanger according to any one of claims 1 to 21, wherein a turbulator is provided in at least one of the first flow passages.   23. A heat exchanger according to any one of the preceding claims, wherein a turbulator is provided in at least one of the second flow passages.   24. A heat exchanger according to any one of claims 1 to 21 and 23, wherein the base of at least one of the first fluid core plates has spaced projecting depressions.   25. A heat exchanger according to any one of claims 1 to 22 and 24, wherein the base of at least one of the second fluid core plates comprises a plurality of spaced apart protrusions.   26. A heat exchanger according to any one of claims 1 to 21, 23 and 25, wherein the base of at least one of the first fluid core plates comprises spaced projecting ribs.   27. A heat exchanger according to any one of claims 1 to 22, 24 and 26, wherein the base of at least one of the second fluid core plates comprises spaced projecting ribs.

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