Patents by Inventor Leif Hallgren

Leif Hallgren has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Publication number: 20110083833
    Abstract: A heat exchanger plate for the use in a three circuit heat exchanger assembly, where the plate comprises a first distribution area, a heat exchange area and a second distribution area, where the plate comprises a corrugated pattern having ridges and valleys, and where the central port hole in the first distribution area is positioned at a vertical distance from the short end of the plate such that a fluid passage is obtainable between the central port hole and the short end of the plate when two plates are stacked to form a fluid channel between the plates. The invention further relates to an assembly made from such heat exchanger plates and a heat exchanger comprising a plurality of such assemblies. The advantage of the invention is that an improved heat exchanger is provided, having an increased thermal performance and an improved flow distribution in the heat exchanger.
    Type: Application
    Filed: June 12, 2009
    Publication date: April 14, 2011
    Inventors: Alvaro Zorzin, Leif Hallgren, Angelo Muzzolon, Marcello Pavan, Emanuele Biancon
  • Patent number: 5509471
    Abstract: A plate heat exchanger for evaporation of a liquid includes a number of thin heat transfer plates (4), provided with corrugation pattern in the form of ridges and grooves, which in each second plate interspace for supply of said liquid have several inlet openings (18) distributed horizontally across the width of the heat transfer plates. The heat transfer plates each have a horizontal portion (28) having less pressing depth that the rest of the corrugation pattern, which is formed such than the heat transfer plates (4) in the area of the portions (28) referred to, abut against each other in the plate interspaces for said liquid and are separated from each other in the plate interspaces for a heating fluid.
    Type: Grant
    Filed: October 19, 1994
    Date of Patent: April 23, 1996
    Assignee: Alfa Laval Thermal AB
    Inventor: Leif Hallgren
  • Patent number: 5226474
    Abstract: In a plate heat exchanger for climbing film evaporating of a fluid, vertically arranged heat transfer plates (1, 2) delimit evaporating passages (4) and condensating passages (7) between themselves. Each evaporating passage (4) has a fluid inlet (5) at its lower portion and an outlet (6) for concentrated fluid and generated vapor at its upper portion, which outlet (6) is located at one vertical side of the heat transfer plates. To provide a desired distribution of the fluid and the vapor in each of the evaporating passages (4), at least alternate heat transfer plate (1), in its lower portion (17A) closest to the inlet (5) for fluid, has been provided with a number of zones (23A-26A), having different pressing pattern of corrugation ridges and grooves.
    Type: Grant
    Filed: September 16, 1991
    Date of Patent: July 13, 1993
    Assignee: Alfa-Laval Thermal AB
    Inventor: Leif Hallgren
  • Patent number: 5174370
    Abstract: The present invention relates to a plate heat exchanger for the evaporation of a fluid which is comprised of a plurality of heat transfer plate pairs. Each plate of the pair has a ridged and grooved corrugation pattern. Between adjacent plates are flow spaces, each having an inlet and an outlet. The ridges of each plate of each pair abut the ridges of the other plate in the pair to form a plurality of supporting points. The flow spaces between alternate plates form passages for the fluid, and the remaining flow spaces form passages for a heating fluid.The importance of the invention is that at least alternate heat transfer plates have a plurality of zones with different corrugation patterns arranged sequentially in the direction of fluid flow in the passages. The ridges and grooves of each plate in the pair are arranged to provide a flow resistance which gradually decreases in the direction of fluid and generated vapor flow.
    Type: Grant
    Filed: September 16, 1991
    Date of Patent: December 29, 1992
    Assignee: Alfa-Laval Thermal AB
    Inventor: Leif Hallgren
  • Patent number: 4605060
    Abstract: A plate (1) for a plate heat exchanger is provided with a corrugation pattern of ridges (4) and grooves (3) intended to rest against the corrugation pattern on an adjacent plate so that a great number of supporting points (2) are formed. On at least one of its sides, the plate has ridges provided with recessed parts (5) positioned in the areas of the supporting points (2). Thus, the number of turbulence-generating supporting points and consequently the flow resistance are reduced in an adjacent heat exchanging passage (7).
    Type: Grant
    Filed: July 19, 1983
    Date of Patent: August 12, 1986
    Assignee: Alfa-Laval AB
    Inventors: Jarl A. Andersson, Leif Hallgren
  • Patent number: 4316679
    Abstract: In apparatus for injecting and mixing a ground stabilization agent into the material of the earth during the operation of an earth drill, a device is provided for generating signals indicative of the upward movement of the earth drill as the drill is withdrawn and while the stabilization agent is being introduced, and a weighing device is provided for constantly weighing the remaining supply of ground stabilization agent and for thereby measuring the weight of stabilization agent delivered to the ground, and a recorder is connected to receive signals from both of the devices for providing a graphic record of the stabilization agent delivered versus the upward travel of the earth drill.
    Type: Grant
    Filed: April 13, 1978
    Date of Patent: February 23, 1982
    Assignee: Linden-Alimak AB
    Inventors: Signar Lundmark, Leif Hallgren
  • Patent number: D272692
    Type: Grant
    Filed: January 4, 1982
    Date of Patent: February 21, 1984
    Assignee: Hallgrens Industri AB
    Inventor: Leif Hallgren