Diesel Kiki Co., Ltd.

Zexel Gmbh

Nippon Carbon Co., Ltd.

Masahiro Iio

Mitsuya Ono

Yoshio Suzuki

Katsumi Sakamoto

Tsunenori Shibuya

Teruo Nakamura

Haruhiko Takada

Toshihiro Murayama

Hidehiko Takayama

Hiroshi Yamazoe

Yasuhiko Saruwatari

In order to perform a heating operation with the correct quantity of coolant at all times by retaining an approximately fixed quantity of coolant in a main condenser during the initial stage of a heating operation in an air conditioning system, a first valve is opened and, at the same time, a second valve is closed before executing the heating operation to run the cooling/heating cycle as a cooling cycle for a specific length of time. Then, after opening a bypass passage by opening the second valve, the first valve is closed to close off the passage leading to the main condenser to start the heating cycle. As a result, a fixed quantity of coolant can always be retained within the main condenser, realizing the operation of a heating cycle with a correct coolant quantity.

Air conditioning system which can be used in an electric car

A compressor has a cylinder formed of an aluminum alloy, and a moving member slidably received within the cylinder. Hard particles are dispersed in the inner peripheral surface portion of the cylinder. The hard particles are formed of a chemical compound such as a nitride and a carbide. The cylinder is manufactured by preparing a first green compact formed of a mixture of a powdery material for the aluminum alloy and the hard particles and a second green compact formed solely of the powdery material, preparing a billet having an inner layer formed of the first green compact, and an outer layer formed of said second green compact, placing the billet in a preheated state into a container and further heating same therein, and fitting a mandrel through a central bore of the billet and pressurizing the billet to extrude same through a die hole in a die.

Compressor with a cylinder having improved seizure resistance and

A sliding-vane rotary compressor including a drive shaft having one end portion rotatably supported by a bearing fitted in a central hole in a rear block, the opposite end portion of the drive shaft extending loosely through a central hole in a front block and being rotatably supported by a bearing fitted in a central bore in a front head, the front head having a plurality of support ribs held in abutment with an outside end face of the front block for supporting the front block. With this construction, the front block and the front bearing are thermally separated from one another, so that a bearing clearance between the front head and the drive shaft is kept always constant even when the front side block is subjected to a high temperature. In addition, by the use of the support ribs, a thinner side block can be used.

Sliding-vane rotary compressor with front end block and bearing

A vane compressor includes a cylinder having a pair of side blocks. A communication passage is formed through at least one of the side blocks. The communication passage has one end thereof opening into a discharge pressure chamber, and another end thereof opening in a rotor side end face of the at least one of the side blocks at a location corresponding to the orbital path of an end of a back pressure chamber defined in each of vane slits having a vane slidably fitted therein. The communication passage is provided therein with a valve which opens the communication passage when the difference between pressure in the discharge pressure chamber and pressure in the back pressure chamber is below a predetermined value, and closes same when the difference in pressure is above the predetermined valve.

Vane compressor with means for obtaining sufficient back pressure upon

A compressor includes at least one compression space for compressing refrigerant, at least one communication chamber into which the refrigerant is discharged from the compression space, a discharge pressure chamber, and at least one communications passage communicating the communication chamber with the discharge pressure chamber for feeding the refrigerant from the communication chamber into the discharge pressure chamber. The length of the passage is longer than the diameter of the passage.

Compressor with reduced vibrations

A sliding-vane rotary compressor cylinder having a row of discharge holes arranged in an axial direction of the cylinder, and a corresponding number of discharge valves normally closing the respective discharge holes. The opening of two endmost discharge valves is limited by a first valve-opening limiting device to a first value. The opening of the remaining discharge valves is limited by a second valve-opening limiting device to a predetermined value which is larger than the first value. With this construction, the a rotor rotatably received in the cylinder is stably held in position against axial displacement or oscillation.

Sliding-vane rotary compressor

A sliding-vane rotary compressor includes a cylinder having a plurality of discharge holes aligned in an axial direction of the cylinder, and a corresponding number of discharge valves normally closing the respective discharge holes. Respective openings of the discharge valves are limited in such a manner as to increase progressively in a direction from a front side to a rear side of the cylinder to thereby produce a pressure difference between the front and rear sides of the cylinder. With this pressure difference, the cylinder is normally urged toward one side and hence is unlikely to oscillate in the axial direction. The compressor thus constructed is capable of operating silently without generating an unpleasant oscillating noise.

A sliding-vane compressor of the type including a compressor body housed in a front head and a shell, wherein a cushioning member is disposed on at least one of a contacting surface between the front head and the compressor body and a contact surface between the compressor body and the shell for taking up vibration produced by the compressor body before the vibration is transmitted to the shell. The cushioning member which is disposed between a rear side block of the compressor and the shell may be formed integrally with a seal member.

Sliding-vane rotary compressor with vibration cushioning members

A press-fit structure of a shaft comprising a shaft and a member to be fitted with the shaft formed with a shaft hole for receiving the shaft therein, the shaft being formed at a predetermined position of the peripheral surface thereof with a meshing shaft portion which is formed with a plurality of meshing projections in the axial direction, the shaft hole being formed in an inner peripheral surface thereof with an annular groove for collecting a press-fit fin of cut material.

Press-fit structure of a shaft

A vane rotary compressor wherein at least the rotor, side blocks and vanes are formed from Si-Al alloy materials, respectively, the rotor and the side blocks or the rotor and the vanes differ from each other by more than 3% in terms of their silicon content. Thus, the compressor has improved wear resistance, seizure resistance, compression performance and durability.

Seizure-free vane rotary compressor with vanes, rotor and side blocks

In a refrigerant compressor, a driving shaft is rotatably supported within a compressor housing by a bearing on a suction side. A trigger valve is provided in a passageway communicating a discharge pressure chamber with the bearing on the suction side. When pressure within the discharge pressure chamber is lower than a predetermined value, the trigger valve opens the passageway to permit gaseous refrigerant of high temperature within the discharge pressure chamber to be supplied to the bearing on the suction side.

Refrigerant compressor with shaft bearing having improved wear resistance

This vane type compressor includes: a main body comprising a cylinder block formed with a bore and end members closing the ends of the bore; a rotor received within the main body in the bore so as to be rotatable about an axis extending in its longitudinal direction, its surface being formed with several slots extending in its longitudinal direction; and several vanes, each slidably fitted into one of the slots with its outer edge bearing against the inside surface of the bore in the main body. The material from which the vanes are formed is a composite material, comprising carbon and a metal including a substantial proportion of aluminum, and further including a substantial quantity of aluminum carbide, which holds the composite material together well and prevents the metal from coming away therefrom. This aluminum carbide may lie between the carbon and the reinforcing metal, and may be in a quantity of from about 1% to about 20%. The rotor may be made from cast iron, or from a material which has a similar coefficient of thermal expansion to the material for the vanes; this means that the vanes always fit well into the slots, no matter what may be the operating temperature of the compressor.

Compressor with vanes made of composite material including carbon,

In a refrigerant compressor for use in an air conditioning system, a lubricating oil-separating device is mounted in the discharge pressure chamber communicating with pump outlets of the pump assembly and also with the discharge port. The lubricating oil-separating device comprises a plurality of tubes vertically disposed in a direction traversing flows of compressed refrigerant. The tubes each have at least one recess formed in a portion of its peripheral surface facing downstream of the compressed refrigerant flow, and an opening formed in the recess and communicating with the interior of the tube, whereby compressed refrigerant in the form of von Karman's vortices formed immediately downstream of the tube is introduced into the interior of the tube to thereby effectively separate the lubricating oil from the refrigerant.

Lubricating oil-separating device in a refrigerant compressor for air

A sealing chamber is defined between the front head and the front side block. The drive shaft on which the rotor is rigidly fitted is journalled by front and rear plain bearings provided on the front and rear side blocks, respectively. The bearing on the front side has an end portion remote from the rotor enclosedly disposed in the sealing chamber. The sealing chamber communicates in a direct manner with the suction port formed in the compressor casing by way of a passage means so as to be supplied in a direct manner with suction refrigerant having a low temperature and a low pressure.

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Konan, Japan

Masahiro Iio