Mitsubishi Denki Kabushiki Kaisha

Masao Kohashi

Yoshihiro Sumida

Youichi Hisamori

Akito Yokoi

Tutomu Noma

Masaaki Taniguchi

Mitunori Kurachi

Harumasa Shibata

Ken-ichi Azuma

Kentaro Mori

Yoichiro Takahashi

Yoshiyuki Sawada

A knock sensor is constructed by putting and fitting components including an annular piezoelectric element, terminal plate, insulating sheet and weight onto a base consisting of a flange portion and a tubular portion, forming a groove part on a tip outer circumferential surface of the tubular portion, fitting a stopper ring functioning to apply an axial preload to the components onto the tubular portion, and caulking fixedly the stopper ring and the tubular portion into the groove part.

Knock sensor and manufacturing method thereof

A stacked body constituted by a first insulating sheet, a first terminal plate, a piezoelectric element, a second terminal plate, a second insulating sheet, a weight, and a disk spring is fitted over a cylindrical portion of a base, clamped and held between a nut and a flange portion of the base, and resin-molded. Annular partial electrodes having a width narrower than a radial width of the piezoelectric element are formed on front and rear surfaces of the piezoelectric element. The first and second terminal plates have annular portions formed so as to have annular shapes having an outside diameter and an inside diameter substantially equal to those of the partial electrodes, and are stacked such that the annular portions are placed in close contact with entire surfaces of the partial electrodes.

Knock sensor

To eliminate a fear of electrolytic corrosion even in the case where a heat exchanger to be connected to the outside of the plate-type heat exchanger has a copper piping, and to prevent any damage from being given to the brazed portions of the plate-type heat exchanger at the time of joining pipes and to prevent faults from being generated in joined portions. An intermediate pipe made of a material in which the value of polarization potential becomes lower than that generated between a body of the plate-type heat exchanger and the copper piping is interposed between the plate-type heat exchanger body and the copper piping. Further, the plate-type heat exchanger body is disposed in a position out of a vertical line of a joined portion between the copper piping and the intermediate pipe. Further, a joint constituted by an intermediate pipe and a copper pipe joined in advance through brazing or welding at a temperature higher than a temperature of brazing of the plate-type heat exchanger body is brazed at the same time of brazing of the plate-type heat exchanger body under the condition that the joint is arranged so that the intermediate pipe side of the joint is joined with the end plate of the heat exchanger body.

Method of producing a plate-type heat exchanger

Plate-type heat exchanger and method of producing the same

An air conditioning apparatus includes a pipe unit in the form of a block-like member, the pipe unit comprising: control components, like a four port valve, a two port valve and a check valve, of the refrigerating cycle, which are incorporated in the block-like member; refrigerant passages which are formed in the block-like member to lead to the control components; and connecting ports which are formed in the block-like member to be connected to essential components, like a compressor, and an indoor and an outdoor heat exchanger, of the refrigerating cycle.

Air conditioning apparatus

Growing community of inventors

Tokyo, Japan

Masao Kohashi