Scroll expander
AssigneeSanden Holdings Corporation
InventorYuuta Tanaka
Life of this patent
Estimating the term…
Abstract
Scroll expander including a bypass passage and a bypass valve configured to open and close the bypass passage without significantly increasing the length in the shaft direction of the scroll expander. Scroll expander 23 includes suction port 513 which allows a high-pressure flow of a working fluid to enter and guides the entering flow of the working fluid into an expansion chamber. Discharge port 523 allows the working fluid expanded to a lower pressure in the expansion chamber to flow out. Bypass passage 27 communicates suction port 513 with the discharge port 523 while bypassing the expansion chamber. Bypass valve 28 is configured to open and close bypass passage 27. Suction port 513, bypass passage 27 and a bypass valve attaching portion 514 for attaching the bypass valve 28 are formed in a base plate of the fixed scroll 51.
Claims7
A scroll expander including a fixed scroll and a movable scroll which define an expansion chamber therebetween, the movable scroll being configured to be driven by expansion of working fluid in the expansion chamber, comprising:
- a suction port which allows a high-pressure flow of the working fluid to enter, and which guides the entering flow of the working fluid into the expansion chamber;
- a discharge port which allows the working fluid expanded to a lower pressure in the expansion chamber to flow out;
- a bypass passage through which the suction port communicates with the discharge port while bypassing the expansion chamber;
- and
- a bypass valve configured to open and close the bypass passage,
- wherein:
- the suction port, the bypass passage and a bypass valve attaching portion for attaching the bypass valve are formed in a base plate of the fixed scroll,
- both of the suction port and the bypass passage extend along a scroll non-forming surface, which is opposite to a scroll forming surface in which a scroll wall is formed, of the base plate of the fixed scroll, and then curves to pass through the base plate of the fixed scroll till reaching the scroll forming surface, the suction port and the bypass passage reaching different positions from each other in the scroll forming surface, and
- the bypass valve attaching portion is formed as a hole for inserting the bypass valve so as to extend along the scroll non-forming surface of the base plate of the fixed scroll in communication with the bypass passage.
A scroll expander including a fixed scroll and a movable scroll which define an expansion chamber therebetween, the movable scroll being configured to be driven by expansion of working fluid in the expansion chamber, comprising:
- a suction port which allows a high-pressure flow of the working fluid to enter, and which guides the entering flow of the working fluid into the expansion chamber;
- a discharge port which allows the working fluid expanded to a lower pressure in the expansion chamber to flow out;
- a bypass passage through which the suction port communicates with the discharge port while bypassing the expansion chamber;
- and
- a bypass valve configured to open and close the bypass passage,
- wherein:
- the suction port, the bypass passage and a bypass valve attaching portion for attaching the bypass valve are formed in a base plate of the fixed scroll,
- both of the suction port and the bypass passage extend along a scroll non-forming surface, which is opposite to a scroll forming surface in which a scroll wall is formed, of the base plate of the fixed scroll, and then curves to pass through the base plate of the fixed scroll till reaching the scroll forming surface,
- the bypass valve attaching portion is formed as a hole for inserting the bypass valve so as to extend along the scroll non-forming surface of the base plate of the fixed scroll in communication with the bypass passage, and
- at least either of at least one rib and at least one thick portion is formed in an area including none of the suction port, the bypass passage and the bypass valve attaching portion on the scroll non-forming surface of the base plate of the fixed scroll.
Dependencies are inferred from the claim text.