摘要:
A scroll compressor is provided with injection tubes which extend through an upper shell and into a fixed scroll member. The injection tubes are fixed relative to the fixed scroll member, and may be press-fit or otherwise secured. This arrangement simplifies the provision of injection ports into a scroll compressor.
摘要:
A self-modulating scroll compressor includes a built-in volume ratio that is defined as the ratio of a volume of a compression pocket just after completion of suction, i.e. at a beginning of a compression cycle, to the volume of the compression pocket just prior to discharge, i.e. at the end of the compression cycle. The built-in volume ratio can be controlled by the geometry of the scrolls and can be modified by, for example, extending the wrap or adding more turns to the wrap. Because the built-in volume ratio decreases to an effective volume ratio at lower capacity operation, the built-in volume ratio is at least 2.4 in order to optimize overall compressor efficiency.
摘要:
A scroll compressor has lubricant flow which communicates lubricant onto a motor protector when adverse conditions are present causing the motor protector to trip the motor and stop further rotation. The lubricant is returned to an oil sump through a normal return path. The normal return path outlet may be positioned above the motor protector such that lubricant will contact the motor protector when adverse conditions are present, or the outlet may be remote from the protector. When the outlet is remote from the protector, a funnel and tubing divert the oil to the motor protector under adverse conditions. Alternatively, a passage communicating with the normal return path is selectively blocked when an adverse condition is present. At that time, lubricant is forced into an alternative oil path, which is positioned above the motor protector.
摘要:
A scroll compressor is provided with a passage for providing both an unloader function and an economizer injection function. This common passage communicates with separate ports. The ports that are exclusively used for by-pass unloading operation are open only during by-pass unloading operation, but blocked off by a check valve during vapor injection operation. The other, normally smaller vapor injection ports are open for both vapor injection and by-pass unloading operation. By utilizing these two sets of ports, a smaller total port area is provided for vapor injection operation and a much larger total open port area for by-pass operation. The different open port areas for by-pass unloading operation and vapor injection operation allows optimization of compressor operation at both of those regimes of operation.
摘要:
Oil retention recesses are formed on either or both orbiting and non-orbiting scroll elements. In one embodiment, the recesses are formed in a tip of a wrap of at least one of the scroll members. In another embodiment the recesses are formed on the base of at least one of the scroll elements. The recesses ensure that a sufficient quantity of oil is captured within the recesses to provide the lubrication into the interfacing surface of these elements. The recesses help, after a compressor is shutdown for long periods, to provide as lack of lubricant between the engaged scroll elements upon compressor start up. Other events may also cause momentary loss of oil supply at the compressor, such as, for example, compressor flooding. The recesses also help during intermittent interruption of oil delivery or when the amount of oil circulation is less than desirable.
摘要:
A scroll compressor includes a scroll member having a base and a generally spiral wrap that extends from the base to define a portion of a compression chamber. The scroll member is made of a cast iron material comprising a microstructure having graphite nodules.
摘要:
A scroll compressor is provided with economizer injection ports, which extend through the wrap of one of the scroll members. Preferably the injection ports are formed through a so-called “hybrid” wrap, which has a varying thickness. The other scroll member is provided with grooves in its base plate. The injection of economizer fluid occurs only during a portion of the orbiting cycle when the injection port and corresponding grooves are aligned with each other. An indentation is formed into the wrap that includes the injection port. The indentation is spaced circumferentially from the injection port. The indentation communicates with the groove, such that refrigerant can pass from the injection port, into the groove, and through the indentation into a compression chamber. This increases the injection time allowing more fluid to be injected into the compression chamber, and provides the scroll compressor designer with greater freedom to achieve desired flow of economizer fluid into the compression chambers.
摘要:
A scroll compressor has a novel slider block with an upper surface that extends for a greater extent than the prior art. By extending this upper surface, the upper surface is better able to withstand wear on the slider block during the life of the scroll compressor.
摘要:
A scroll compressor assembly includes a shaft having an eccentric pin that orbits a first scroll member relative to a second scroll member. The eccentric pin has a length extending from a base end to a distal end, which defines a contact area having a slight crown that engages a slider block. The contact area is moved toward the distal end of the eccentric pin to improve the stability of at least one of the first and second scroll members.
摘要:
A scroll compressor has a recess cut into a surface of a crankcase or an orbiting scroll while there is no material removed next to the seals that seal refrigerant in the back chamber located between the orbiting scroll and crankcase. Because there is no material removed next to the seals, the gap between the orbiting scroll and crankcase remains intact in the sealing area and the seals continue to operate properly preventing the refrigerant leakage through the gap. In this case, the dimensional tolerances of the crankcase and orbiting scroll surfaces need only be tightly controlled in the area adjacent to the seals. The surface areas away from the seals do not require tight tolerance control, thus manufacturing and assembly is simplified and possibility of interference due to small gap between orbiting scroll and crankcase is avoided. In the preferred embodiment, the recess is introduced into the back chamber surface area of the crankcase.