Rotary expansible chamber devices – Helical working member
Reexamination Certificate
1999-03-04
2001-02-13
Denion, Thomas (Department: 3748)
Rotary expansible chamber devices
Helical working member
C418S152000
Reexamination Certificate
active
06186759
ABSTRACT:
BACKGROUND OF THE INVENTION
The present invention relates to a helical blade type compressor used as a compressor for composing a refrigeration cycle of, for example, an air conditioner.
The helical blade type compressor has been recently proposed.
In this helical blade type compressor, a cylinder for composing the compression mechanism is disposed in an enclosed case, and a roller revolves in the cylinder. Spiral grooves are provided in the roller circumference or cylinder inside, and helical blades are contained to be free to move in and out.
In such constitution, plural combustion chambers are formed continuously between the cylinder and roller, and between mutual helical blades. When the roller revolves in this state, the refrigerant gas is sucked into the compression chamber at one end side, and is compressed as being gradually transferred to the compression chamber at other end side.
According to this kind of compressor, defective sealing performance in the conventional reciprocating type or rotary type compressor can be eliminated, and the sealing performance is enhanced in a relatively simple constitution, and efficient compression is realized, while it is easier to manufacture and assemble parts.
In this helical blade type compressor, sealing between the high pressure side and low pressure side is achieved by the sliding surface or tiny gap between the roller and the bearing member which receives the thrust load of the roller.
However, in the structure of sealing by making use of the thrust load of the roller, it is hard to keep a sufficient sealing performance, and the thrust sliding surface may be seized in case of occurrence of an excessive thrust load. In the conventional structure, since the thrust load acting on the roller cannot be controlled easily, there were problems to be solved in relation to performance and reliability.
BRIEF SUMMARY OF THE INVENTION
It is hence an object of the invention to present a helical blade type compressor capable of controlling the thrust load and obtaining a sufficient sealing performance.
To solve the problems, the invention discloses the following constitutions, effects and actions. The corresponding drawings are described below for reference, but it must be noted that they should not be interpreted to limit the scope of the invention.
(1) (corresponding to FIG.
1
and
FIG. 5
) A helical blade type compressor comprising:
a case, a cylindrical cylinder provided in the case, a roller disposed in the cylinder, and helical blades of uneven pitches for dividing a compression chamber so that the volume may be gradually smaller in the axial direction between the cylinder and roller, for revolving the cylinder and roller to move the compression chamber in the volume decreasing direction, thereby compressing the air,
in which at least one seal member is provided in the roller for separating into pressure in the case and the pressure in the compression chamber.
According to such constitution, by disposing the seal member for separating high and low pressure in the cylinder, secure sealing is enabled without generating excessive thrust load, and the performance and reliability are enhanced. By the use of seal ring, it is easy to adjust the thrust load acting on the roller.
In this constitution, the expressing “provided in the roller” means not only direct holding by the roller, but also contacting with the roller as being held by a member confronting the roller, for example, the cylinder or at the receiving member side.
(2) (corresponding to FIG.
1
and
FIG. 5
) In the helical blade type compressor of (1),
the seal member is freely inserted into an annular groove provided in the roller outer circumference, and abuts against the annular groove and cylinder to separate into the pressure in the case and the pressure in the compression chamber.
According to such constitution, it is easy to adjust the balance of the thrust load acting in the roller axial direction. Besides, the structure is simple, the manufacturing efficiency is excellent (processing cost is lowered, and the assembling performance is improved), so that an inexpensive compressor may be presented.
(3) (corresponding to
FIG. 6
,
FIG. 7
, and
FIG. 8
) In the helical blade type compressor of (2),
the annular groove and the seal ring member to be inserted in the annular groove are provided in a plurality each. According to such constitution, when using plural seal ring members, by sharing and processing common seal rings, the cost is reduced.
Preferably, the plural annular rings and seal ring members should be of same dimensions and materials, individually.
Or, between the plural annular rings and seal ring members, the dimensions or materials may be different at least at one position.
By using plural seal ring members, it is very effective for keeping the sealing performance depending on the condition of temperature or pressure. In such a case, the shape, dimension or material should be selected depending on the condition of the position of the disposition of each seal ring member, so that the performance and reliability may be further enhanced.
(4) (corresponding to
FIG. 6
) In the helical blade type compressor of (2),
the roller has a flange of a large diameter, and the seal ring is held by the flange.
By holding the seal ring by the flange, the bending moment is prevented from acting on the section of the seal ring. As a result, if the seal ring is thin and made of a soft material, that is, if the rigidity is weak, a large pressure difference can be sealed by the seal ring member. Hence, a compact and inexpensive seal structure can be presented.
(5) (corresponding to
FIG. 7
) In the helical blade type compressor of (2),
the roller is composed of a main body and a lid which can be divided in the portion of the annular groove.
According to such constitution, the seal ring can be easily fitted in the annular groove.
In one aspect, a packing is placed between the roller main body and lid, and they are fixed by a bolt. In such constitution, the sealing performance of the divided portion is enhanced.
In other aspect, the roller main body and lid are made of same material, and the surface is treated by nitriding, Ni—P—B plating or other surface treatment depending on the material of the seal ring member. In such constitution, the coefficient of thermal expansion of the main body and lid is the same, and therefore if temperature rise occurs during operation, distortion hardly occurs. Moreover, by surface treatment depending on the material of the seal ring, the sliding performance and reliability are enhanced.
In a different aspect, of the main body and lid, the material of the side sliding with the seal ring member and the material of the side not sliding with the seal ring member are different. In such constitution, only the material of the side sliding with the seal ring member may be made of a material excellent in sliding performance with the seal ring member.
(6) (corresponding to
FIG. 8
) In the helical blade type compressor of (2),
the inside diameter of the cylinder inner circumference of the portion contacting with the seal ring member is different from the inside diameter of the portion in which the helical blade of the cylinder is disposed.
According to such constitution, the thrust load acting on the roller by the seal ring member can be set depending on the magnitude of the thrust load acting on the roller by the helical blade (in the reverse direction of the thrust load by the seal ring member). Therefore, one thrust load can be set larger than the other thrust load, so that the roller can be pressed in one direction so as to be stabilized in motion. As a result, the vibration and noise can be decreased.
In one aspect, the inside diameter of the cylinder inner circumference of the portion contacting with the seal ring member is larger than the inside diameter of the portion in which the helical blade of the cylinder is disposed.
In other aspect, the inside diameter of the cylinder inner circumference of the portion contacting with the seal ring member is smal
Hayano Makoto
Morishima Akira
Sakata Hirotsugu
Denion Thomas
Kabushiki Kaisha Toshiba
Oblon & Spivak, McClelland, Maier & Neustadt P.C.
Trieu Theresa
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