Fujikoki Corporation

Denso Corporation

Makoto Sudo

Kazuhiko Watanabe

Shin Yoshida

Kazuto Kobayashi

Osamu Hishinuma

Hiroatsu Yamada

Takao Okada

Masamichi Yano

Eiji Fukuda

Daisuke Watari

Akinori Nanbu

Hideyuki Yanagiya

Masahiro Tomitsuka

A pulsation damper is small in size and can achieve an appropriate supporting force for a diaphragm damper. A pulsation damper accommodated in a case includes a diaphragm damper having a gas sealed therein, and a first support member and a second support member that are disposed between the case and the diaphragm damper and that hold the diaphragm damper.

Pulsation damper

A diaphragm includes a flange and a protrusion provided to protrude to one side of the flange, wherein the protrusion has at least two annular curved portions provided annularly on a ceiling portion having a flat surface-like shape and an outer side in a radial direction of the ceiling portion, in a state where pressure on an outer wall side of the protrusion and pressure on an inner wall side of the protrusion are the same, the at least two annular curved portions are each formed to be curved in a cross-section of the diaphragm obtained by cutting the diaphragm by a virtual plane including a center line of the diaphragm, the centers of curvature of the curved portions being arranged at different positions on a side opposite to a protruding direction of the protrusion, and the diaphragm is formed of a sheet metal.

Diaphragm and pulsation damper using same

A pulsation damper includes an upper diaphragm, a lower diaphragm configured to form a sealed space having a predetermined pressure with the upper diaphragm, in which an inert gas is filled; and a deformation suppressing member formed of an elastic material, and comprising an inner cylindrical portion, and an extension portion extending from a center portion on an outer peripheral surface of the inner cylindrical portion such that the extension portion extends outward from a center axis of the inner cylindrical portion, wherein the deformation suppressing member is arranged inside the sealed space such that an outer periphery of the extension portion abuts against inner walls of the upper diaphragm and the lower diaphragm.

An expansion valve includes a valve body having a valve body hole, a first passage, a bottomed valve chamber, a second passage, a third passage and a guide member disposed in the valve body hole between the first passage and the third passage. The valve body hole has a first valve body hole portion and a second valve body hole portion of different diameters forming a valve body step between the second passage and the first passage. The guide has a first guide portion and a second guide portion of different diameters forming a guide portion step. The guide is sized to be slidably received by the valve body hole in a close-fitting relationship with the first valve body hole portion receiving the first guide portion, the second valve body hole portion receiving the second guide portion and the valve body step and the guide portion step contacting each other.

Expansion valve

The invention provides an improved structure for assembling components in an expansion valve used in air conditioners. An expansion valve bodyhas a valve chamberand a passagethrough which refrigerant from a compressor enters. The refrigerant passing through a flow path between a valve meansand an orificeis sent through a passagetoward an evaporator. The refrigerant returning from the evaporator passes through a passageand flows toward the compressor. A power elementoperates the valve meansin response to the thermal load of the evaporator and controls the flow rate of refrigerant. The lower end of a springdisposed within the valve chamberand biasing the valve meanstoward the orificeis supported by a sealing memberthat is inserted to an openingof the valve chamber and fixed to position via a crimping portion K.

A hole 15 is formed to the center portion of an outer wall 14 of a housing defining an airtight chamber, and temperature sensitive gas is filled in the interior of the housing. The hole 15 is sealed by a plug 16 and is fixed by a weld portion 17. An anaerobic UV cure adhesive 34 is filled in the recess 18 formed around the projection weld portion 17, and cured by UV radiation. The surface of the anaerobic UV cure adhesive 34 cures rapidly, and the inner area of the adhesive where UV cannot be radiated is cured infallibly. The thermal expansion valve having such structure can be arranged in an engine room, where corrosion due to water adhering to the weld can be prevented effectively, and as a result prevents gas leak from the weld portion.

Growing community of inventors

Tokyo, Japan

Makoto Sudo