Scroll compressor with pressure differential maintained for supplying oil
First Claim
1. A scroll compressor comprising a compressor means including an orbiting scroll and a stationary scroll coupled together and frame means for supporting the orbiting scroll, an air tight container means for accommodating the compressor means, a discharge outlet means for discharging a gas from said compressor means, said discharge outlet means being in communication with an interior of the air tight container means to maintain a high internal pressure in said air tight container means, and a pressure of the gas during compression in said compressor means is introduced into an intermediate pressure chamber defined on a backside of the orbiting scroll for producing a force for pressing the orbiting scroll against the stationary scroll, and means for supplying oil to a sliding component of the scroll compressor by utilizing a pressure differential between the high pressure in the air tight container and the pressure in the intermediate pressure chamber, a valve means is provided for switching a connection of said intermediate pressure chamber to a higher intermediate pressure said or to a lower intermediate pressure said of said compressor means, said valve means including means for enabling the intermediate pressure chamber to be connected to the lower intermediate pressure side of the compressor means when a discharge pressure of the compressor means is lower than a certain value and to be connected to the higher intermediate pressure side of the compressor means when the discharge pressure is higher than a certain value.
1 Assignment
0 Petitions
Accused Products
Abstract
A scroll compressor including a stationary scroll and an orbiting scroll, with an intermediate pressure chamber being defined on a back side of the orbiting scroll member and being in communication with a pressure chamber through a communication hole to produce a force for pressing the orbiting scroll against the stationary scroll. Oil in an oil sink is supplied to sliding portions by a differential pressure between a pressure in the air tight container and a pressure in the intermediate pressure chamber. A valve is provided for switching the connection of the intermediate pressure chamber to a higher intermediate pressure side or to a lower intermediate pressure side of the compressor. The valve is constructed such that the intermediate pressure chamber is connected to the lower intermediate pressure side of the compressor when a discharge pressure of the compressor is lower than a certain value and connected to the higher intermediate pressure side of the compressor when the discharge pressure is higher than a certain value so that a proper oil supply pressure is maintained over a wide operational range.
65 Citations
5 Claims
- 1. A scroll compressor comprising a compressor means including an orbiting scroll and a stationary scroll coupled together and frame means for supporting the orbiting scroll, an air tight container means for accommodating the compressor means, a discharge outlet means for discharging a gas from said compressor means, said discharge outlet means being in communication with an interior of the air tight container means to maintain a high internal pressure in said air tight container means, and a pressure of the gas during compression in said compressor means is introduced into an intermediate pressure chamber defined on a backside of the orbiting scroll for producing a force for pressing the orbiting scroll against the stationary scroll, and means for supplying oil to a sliding component of the scroll compressor by utilizing a pressure differential between the high pressure in the air tight container and the pressure in the intermediate pressure chamber, a valve means is provided for switching a connection of said intermediate pressure chamber to a higher intermediate pressure said or to a lower intermediate pressure said of said compressor means, said valve means including means for enabling the intermediate pressure chamber to be connected to the lower intermediate pressure side of the compressor means when a discharge pressure of the compressor means is lower than a certain value and to be connected to the higher intermediate pressure side of the compressor means when the discharge pressure is higher than a certain value.
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3. A scroll compressor comprising:
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an air tight container means provided with a discharge port, a suction port, and an oil containing portion; a compressor means including an orbiting scroll and a stationary scroll coupled together, and provided with a discharge outlet communicating with an interior of said air tight container means; a frame means fixedly mounted on said air tight container means and supporting said compressor means; an intermediate pressure chamber defined by said frame means and a backside of said orbiting scroll; a first passage means for communicating said intermediate pressure chamber and a first portion of said compressor means in which an intermediate pressure between a discharge pressure and a suction pressure is obtained, the intermediate pressure being introduced into said intermediate pressure chamber producing a force for pressing said orbiting scroll toward said stationary scroll; motor means incorporated in said air tight container means; a shaft means, engaged with said motor means and said orbiting scroll for transmitting a driving force from said motor means to said orbiting scroll, said shaft means including an oil path through which oil in said oil containing portion is supplied to a sliding part between said orbiting scroll and said shaft means by a differential pressure between the discharge pressure applied on the oil in said oil containing portion and the intermediate pressure in said intermediate pressure chamber; a second passage means for communicating said intermediate pressure chamber means with a second portion of said compressor means in which the pressure is lower than the intermediate pressure in said first portion of said compressor means; and a valve means, mounted on said second passage means and communicated with said discharge outlet for controlling the communication between said intermediate pressure chamber and said second portion of said compressor means in accordance with the discharge pressure so that the intermediate pressure chamber is fluidly connected to said second portion of said compressor means when the discharge pressure of said compressor means is lower than a certain value and disconnected from said second portion of said compressor means when the discharge pressure is higher than a certain value, and wherein said valve means is mounted on said first passage means in addition to said second passage means, said valve means further including means for fluidly disconnecting said intermediate pressure chamber from said first portion of said compressor means when the discharge pressure is lower than a certain value and connecting said first portion of said compressor means when the discharge pressure is higher than a certain value, whereby the valve means switches the connection of said intermediate pressure chamber to one of said first and second portions of said compressor means to that the intermediate pressure chamber is connected to said second portion of said compressor means when the discharge pressure is lower than a certain value when connected to said first portion of said compressor means when the discharge pressure is higher than a certain value.
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4. A scroll compressor comprising:
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an airtight container means provided with a discharge port and a suction port and an oil sink at a lower portion thereof; a motor means disposed in said air tight container means disposed in said air tight container means at a position above said oil sink and secured to said air tight container means; an orbiting scroll having an end plate and a spiral wrap; a stationary scroll member having an end plate and spiral wrap with the stationary and orbiting scroll members being arranged such that the spiral wraps mesh with each other so as to form a compressor means, said compressor means having a suction chamber fluidly connected to said suction port and a discharge outlet opening into an interior of said air tight container and fluidly connected to said discharge port of said air tight container means through the interior of said air tight container means; an intermediate chamber defined by said frame means and said orbiting scroll; a first passage means for communicating said intermediate pressure chamber with a first position of said compressor means from which an intermediate pressure between a suction pressure and a discharge pressure is obtained; shaft means passing through said frame means and connected to said orbiting scroll and to said motor means for driving said orbiting scroll, said shaft means having oil means through which oil in said oil sink is supplied into sliding portions between said shaft means and portions of said orbiting scroll and said frame means contacting said shaft means by a differential pressure between a discharge pressure applied on oil in said oil sink and an intermediate pressure in said intermediate pressure chamber; a second passage means for communicating said intermediate pressure chamber with a second portion of said compressor means in which a lower pressure than said intermediate pressure is obtained; a valve means communicating with said discharge outlet and provided on said first passage means and said second passage means so as to switch fluid connection of said intermediate pressure chamber from one of said first and second portions of said compressor means to the other in accordance with the discharge pressure so that the fluid connection of said intermediate pressure chamber is switched from said first portion of said compressor means to said second portion of said compressor means when the discharge pressure is lower than a certain value and switched to said first portion of said compressor means when the discharge pressure is higher than the certain value. - View Dependent Claims (5)
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Specification