Mitsubishi Heavy Industries Limited

Paloma Co., Ltd.

Hiroshi Yamazaki

Katsuhiro Fujita

Tetsuzou Ukai

Kazuhide Watanabe

Makoto Takeuchi

Tomohisa Moro

Takayuki Kuwahara

Takahide Ito

Takahide Itoh

Takamitsu Himeno

Yasuharu Maruiwa

Takayuki Hagita

Tetsuzo Ukai

Norio Hioki

Shinta Mishima

Wataru Nakanishi

Hajime Sato

Takayuki Suzuki

Masahiro Ohta

Susumu Matsuda

Hirohumi Hirata

Atsushi Yamane

Koji Terasaki

Yoshio Ando

Hideshi Hamamura

Masaaki Tokuda

Chikako Sasakawa

Yukio Nagato

Yasuhiro Sano

A water heater includes a plurality of stages of burners, a water supply pipe, a hot water outlet pipe, a heat exchanger, a passing water quantity control unit, a temperature detection unit, and an operation control unit. The operation control unit, upon confirmation that a predetermined start condition of a passing water restriction is satisfied at a start of a hot water supply, performs the output hot water temperature control by calculating a target flow rate that causes no switching or a minimum count of switching of the combustion stages of the burners and configuring the passing water quantity control unit to have the target flow rate. The operation control unit, upon confirmation that a predetermined release condition of the passing water restriction is satisfied, executes the passing water control in which the passing water quantity is returned to the predetermined water quantity by gradually releasing the passing water restriction.

Water heater

A water heater includes a burner, a heat exchanger, a passing water quantity control unit, a temperature detection unit, and an operation control unit. The operation control unit performs the output hot water temperature control by configuring the passing water quantity control unit to have a predetermined passing water quantity that is further restricted compared with a predetermined water quantity, and upon confirmation that a predetermined release condition of the passing water restriction is satisfied, executes the passing water control in which the passing water quantity is returned back to the predetermined water quantity by gradually releasing the passing water restriction, and the operation control unit, when a predetermined undershoot factor of the detected temperature is confirmed while the passing water quantity is returned back to the predetermined water quantity, temporarily stops the release of the restriction of the passing water quantity until the undershoot factor is resolved.

An object is to provide a scroll compressor capable of preventing degradation in performance and the occurrence of abnormal noise due to a torsional moment applied to an orbiting scroll, by utilizing the structural advantages of so-called stepped scroll compressors. In a so-called stepped scroll compressor (), in a pair of compression chambers () arranged in a point-symmetrical configuration among a plurality of compression chambers (), the volume Vof the compression chamber () formed on the ventral-surface side of the fixed spiral wrap (B) of the fixed scroll () when intake is cut off and the volume Vof the compression chamber () formed on the ventral-surface side of the orbiting spiral wrap (B) of the orbiting scroll () are different from each other.

Scroll compressor with stepped spiral wraps

An exhaust passage component includes: an inner space used as part of an exhaust passage of a hot water supply apparatus; a drainage passage configured such that if condensed water is produced in the inner space, the condensed water is caused to flow out of the inner space; a first sheet metal member, at least part of which includes a first recess formed by drawing and a plate-like portion formed around the first recess; and a second sheet metal member, at least part of which includes a second recess by drawing and a flange formed around the second recess.

Exhaust passage component

Intended is to provide a fluid machine that can prevent wear of a rotation preventing pin. The fluid machine includes a housing, a fixed scroll fixed with respect to the housing, a turning scroll that revolves around the fixed scroll, and a rotation preventing mechanism that prevents the rotation of the turning scroll. The rotation preventing mechanism includes a rotation preventing pin projected from a wall surface at the housing side or the turning scroll side, and a restraining member that restricts the position of the rotation preventing pin by engaging with the rotation preventing pin. A projecting side end of the rotation preventing pin has a taper shape, and the end of the taper shape has an R-shape.

Fluid machine

A scroll compressor includes a housing; a fixed scroll fixed in the housing; an orbiting scroll that has an orbiting end plate on which a spiral orbiting wall is provided upright and that is supported in the housing so as to be able to orbit while being prevented from rotating, in a state where the orbiting wall is engaged with the fixed wall; a suction section that makes refrigerant containing lubricant flow into a suction chamber provided in the housing; and a plurality of supply flow paths that are provided on a sliding surface between the housing and the orbiting end plate and that are connected to the suction chamber.

Scroll compressor including a communication section between the suction chamber and the supply flow path

Provided is a scroll type compressor which reduces variations in the pressing load of a rotating scroll on a fixed scroll, reduces the impact at the start of the compressor and suppresses noises, and can provide excellent durability. A peripheral elastic bodyand a bottom-portion elastic body, which is brought into a compressed condition in the axis line direction of the main shaft, are interposed between a stopper pinon the rotating scroll side and a concave portionon the main shaftside, whereby working errors of each part are compensated and the rotating scroll is constantly brought into close contact with the fixed scroll to maintain the sealing of the compression chamber.

Scroll type compressor having an elastic member to suppress noise and reduce variations

Provided is a scroll fluid machine that, by using a crankshaft manufactured by cold forging and a needle bearing, can sufficiently exhibit the performance of a variable circling radius mechanism, can provide a sufficient reliability on a bearing portion of the crankshaft, and can be manufactured inexpensively. For this purpose, in a crankshaftused for a driving force transmission system, a reinforced shaft unitand a circular column-like large diameter unitare formed at an end of a rotating shaft, a material is produced by a cold forging process so that an eccentric shaftprojects from the circular column-like large diameter unit, the circular column-like large diameter unitis rotatably coupled to a housingvia a needle bearing, and the variable circling radius mechanism is stably operated with rigidity increased by the reinforced shaft unit

Scroll fluid machine with cold forged eccentric crankshaft

To provide a scroll compressor capable of reducing a noise occurring in a pin-and-ring type self rotation preventing mechanism and improving compression performance. In a scroll compressor comprising: a fixed scroll member and a revolving scroll member; a driven crank mechanism for driving the revolving scroll member to revolutionary turn; and a pin-and-ring type self rotation preventing mechanism provided in plural places for preventing self rotation of a revolving scroll member, at least one of the self rotation preventing pin, the self rotation preventing ring and the self rotation preventing ring hole, which form the pin-and-ring type self rotation preventing mechanism, is provided with an orbit correction part for reducing a maximum displacement R in a direction of self rotation of the revolving scroll member to smooth a change of an orbit of the revolving scroll member in changing a pin and a ring in a section of prevention of self rotation by means of a corresponding pin and ring part.

Scroll compressor with improved rotation prevention mechanism

In a scroll compressor, a center of a turning scroll body is shifted with respect to a drive central axis so that a distance between a gravity center and the drive central axis in a turning scroll becomes smaller than a predetermined allowable value set based on theoretical displacement and mass of the turning scroll. A moment force about the drive central axis acting on the turning scroll is reduced during revolving, and an alternating force acting on an autorotation preventing pin in the turning scroll is reduced to an allowable level.

Scroll compressor having a shifted gravity center

A scroll compressor includes an orbiting scroll engaged with a front case by pins and rings or ring holes to prevent rotation of the orbiting scroll. The rings or the ring holes have such an inside diameter that an orbiting radius defined by the pins and the rings or the ring holes is larger than a theoretical orbiting radius defined by engagement between gear surfaces of a fixed scroll and the orbiting scroll. The pins, the rings, or the ring holes are shifted in such a direction as to relieve twisting of the orbiting scroll relative to the fixed scroll.

Scroll compressor

There is provided a scroll compressor in which reliability and durability is increased by preventing peeling of a coating layer applied to a thrust plate, to maintain a desired level of lubrication for a long period of time. The scroll compressor has a thrust plate, a coating which is applied to a surface of the thrust plate, a housing having a thrust bearing face to which the thrust plate is attached, an orbiting scroll member having a slide face which is supported by the thrust plate and which orbits while sliding, and a peeling prevention part which reduces a sliding pressure acting on an edge portion of the thrust plate from the slide face.

Scroll compressor with thrustplate peeling prevention

There is provided a fluid machine able to secure a sectional area of a passage sufficient for gaseous fluid flow from a suction port to a compression mechanism, while able at the same time to achieve a reduction in size of the outline shape. In a scroll compressor where a scroll compression mechanism is housed within a housing having a funnel shaped, a compression mechanism main body of the scroll compression mechanism is arranged in a wide opening section of a front housing, and a compression mechanism driving section is arranged in a narrow section, a concave section is formed on the outside of a thrust receiving surface which is positioned on a bottom surface of the wide opening section and which supports the compression mechanism.

Fluid machine and scroll compressor having a crankshaft with a large diameter shaft section

A scroll compressor includes a first scroll and a second scroll. The first scroll has a step portion that separates an elevated portion and a recessed portion of a surface of the first scroll. A spiral wall of the second scroll has a step that separates an elevated portion and a recessed portion of the wall. A first bypass hole is provided in the elevated portion of the surface of the first scroll. A second bypass hole is provided in the recessed portion of the surface of the first scroll. The second bypass hole is within 360 degrees toward a center of the spiral of the first scroll from an outer end of the spiral. The first bypass hole is within 360 degrees from the second bypass hole toward the center of the spiral.

Growing community of inventors

Aichi, Japan

Hiroshi Yamazaki