Pumps – Processes
Patent
1991-09-03
1995-03-07
Gluck, Richard E.
Pumps
Processes
417540, 4174105, 418 1, 418 551, F04C 1802
Patent
active
053952146
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to a starting method for a scroll-type compressor of a refrigerator.
BACKGROUND ART
Japanese Patent Unexamined Publication No. 61-213556 (entitled "STARTING METHOD FOR COMPRESSION TYPE REFRIGERATOR") is referenced as a conventional example relating to a starting method for a compressor. In a refrigerator provided with a compressor such as a scroll-type compressor in which a direction of flow of gas is reversed by reversing a rotational direction of a drive shaft, it is difficult to rotate the drive shaft in a normal forward direction because of a large amount of coolant liquid which collects and becomes stagnant in the compressor when the refrigerator is off. However, the publication discloses a technique wherein the compressor is first rotated in the direction opposite to the normal direction at the start-up to discharge the liquid in the compressor mechanism, thereby avoiding both the starting difficulty of the compressor and damage to the compressor. This published patent points out two common phenomena to be avoided by the embodiments thereof. First, the compressor when rotated in the reverse direction generates noise when the normal operation is stopped. Second, a check valve or the like, which is generally provided on the suction side for coping with a problem such as stagnation of a part of the oil in the suction passage, would hinder the first reverse rotation of this starting method. The publication discloses a method for dispensing with the check valve, which would otherwise hinder the reverse rotation in the starting period, by switching a four-way valve into a reverse mode when the refrigerator is stopped from the normal operating condition.
In the above-described conventional starting method of the refrigerator, it is necessary to provide the four-way valve and a mechanism for switching over the four-way valve when the compressor is stopped. Upon switching over the four-way valve, a large reverse flow noise and collision would be generated. Depending upon the operating condition of the refrigerator, there is a risk that the compressor would start the reverse rotation to generate noise until the pressures are stabilized at respective parts of the refrigerator after the four-way valve of the compressor has been switched. In addition, in the case of a refrigerator without any four-way valve, it is necessary to provide an electromagnetic valve instead of the four-way valve, which increases the total cost of the refrigerator.
DISCLOSURE OF THE INVENTION
In order to solve the problems inherent in a starting method of the conventional refrigerator described above, according to a first embodiment, there is provided a method for starting a scroll-type compressor, comprising the steps of: providing a compressor with an electric motor, a compressor mechanism driven by the motor, and an accumulator for temporarily storing a large amount of liquid at a suction passage of the compressor; positioning an outlet check valve in the suction passage or in an outlet passage of compressed gas at an outlet port or its vicinity of the compressor mechanism, the check valve including an outlet valve seat and an outlet valve body for opening/closing the outlet valve seat, the valve seat and valve body being biased away from each other by a gravitational force or a spring, and wherein a passage for the outlet gas is formed around the outlet valve body; providing the compressor mechanism with a stationary spiral vane part having a stationary spiral vane on a stationary end plate, a swirl spiral vane part having a swirl spiral vane on a swirl end plate in engagement with the stationary spiral vane for forming a plurality of compressor working spaces, a revolution restricting part for preventing the swirl spiral vane part from rotating about its own axis but allowing it to undergo a swirl motion, and a crank shaft for driving the spiral vane part to cause the swirling motion; temporarily rotating the compressor in a reverse direction opposite to the normal forward directi
REFERENCES:
patent: 4383805 (1983-05-01), Teegarden et al.
patent: 4545747 (1985-10-01), Tamura et al.
patent: 4759696 (1988-07-01), Ishiai
patent: 5055012 (1991-10-01), Sakashita et al.
patent: 5141420 (1992-08-01), Nambiar
Aiba Osamu
Kawahara Sadao
Kojima Yoshinori
Maeda Shiro
Muramatsu Shigeru
Gluck Richard E.
Matsushita Electric - Industrial Co., Ltd.
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