Abstract: The invention provides a heat exchanger, comprising a casing with a structure of a hollow box and a heat transfer unit accommodated in the casing, wherein the heat transfer unit is so arranged that flat plates are alternately folded back in opposite direction along a fold-back line, a first flow passage and a second flow passage are alternately formed in multiple layers between the flat plates, a first opening and a second opening being communicated with the first flow passage are provided on the casing, a third opening and a fourth opening communicated with the second flow passage are provided on the casing, end portions of the flat plates adjacent, as positioned at the end portion of the fold-back line, to the first flow passage and the second flow passage of the heat transfer unit are crushed and adhered, and edges of the end portions are welded together.

Abstract: A dehumidifier includes a suction unit, a dehumidifying unit having a chiller, a discharge unit having a heat radiator, a refrigerant circulating system, and a heat exchanger. The suction unit sucks humid air into the dehumidifying unit, which cools the humid air and condenses the moisture in the humid air to create dry air. The discharge unit heats and discharges the dry air coming from the dehumidifying unit, and the heat exchanger exchanges heat between the humid air and the dry air coming from the dehumidifying unit. The refrigerant circulating system is used to cool the humid air at the dehumidifying unit and to heat the dry air at the discharge unit. In some embodiments, the heat exchanger includes a heat transfer unit, wherein flat plates are turned back alternately in opposite directions, and a first and second flow passage are prepared alternately in many layers between the flat plates.

Abstract: A heat exchanger comprises a casing designed as a hollow box by a top plate, a bottom plate, a front plate, a rear plate, and two lateral plates and a heat transfer unit accommodated in the casing. The heat transfer unit has flat plates alternately folded back in reverse direction. A first flow passage and a second flow passage are alternately formed in multiple layers between the flat plates. A high temperature fluid inlet and a high temperature fluid outlet in communication with the second flow passage are provided on the front plate side. A low temperature fluid inlet and a low temperature fluid outlet in communication with the first flow passage are provided on the rear plate side. Biasing means applies pressure on the lateral plate sealing member to the end portion of the heat transfer unit and seals the end portions of the first and second flow passages.

Abstract: A dehumidifier comprises a suction unit 45 which humid air 47 is sucked in, a dehumidifying unit 43 having a chiller 56 and for cooling down the humid air sucked in and for dehumidifying by condensing the moisture in the humid air, a discharge unit 46 having a heat radiator 54 and for heating and discharging dry air 49 as dehumidified at the dehumidifying unit, a refrigerant circulating system 44 for cooling down the humid air at the dehumidifying unit and for heating the dry air at the discharge unit, and a heat exchanger 1 for performing heat exchange between the humid air and the dry air as dehumidified at the dehumidifying unit.

Abstract: A heat exchanger comprises a casing designed as a hollow box by a top plate, a bottom plate, a front plate, a rear plate, and two lateral plates and a heat transfer unit accommodated in the casing. The heat transfer unit has flat plates alternately folded back in reverse direction. A first flow passage and a second flow passage are alternately formed in multiple layers between the flat plates. A high temperature fluid inlet and a high temperature fluid outlet in communication with the second flow passage are provided on the front plate side. A low temperature fluid inlet and a low temperature fluid outlet in communication with the first flow passage are provided on the rear plate side. Biasing means applies pressure on the lateral plate sealing member to the end portion of the heat transfer unit and seals the end portions of the first and second flow passages.

Abstract: A machine for spectacle lens, comprising a lens holding unit for holding left and right spectacle lenses, and a drill drive unit relatively moving in left and right directions and in front and rear directions with respect to the lens holding unit and for forming a hole on the spectacle lens held on the lens holding unit, wherein the lens holding unit has lens supporting base plates separated at left and right to match the left and the right spectacle lenses, the spectacle lenses at left and right are supported by the lens holding unit via the lens supporting base plates, and the left and right lens supporting base plates can be rotated around positions symmetrical with respect to the front-to-rear direction.

Abstract: The present invention provides a buffing machine for lens, which comprises chuck shafts for chucking a lens of eyeglasses and for rotatably supporting the lens of eyeglasses and a buff wheel for lens for buffing end surface of the lens of eyeglasses, wherein a rotation axis of the buff wheel is tilted with respect to the chuck shafts, and a buffing surface of the buff wheel is a conical curved surface.