|Publication number||USRE41955 E1|
|Application number||US 10/806,087|
|Publication date||Nov 23, 2010|
|Priority date||Apr 25, 2001|
|Also published as||CN1270091C, CN1382911A, CN1896519A, CN1896519B, DE60203333D1, DE60203333T2, EP1253323A2, EP1253323A3, EP1253323B1, EP1467100A2, EP1467100A3, EP1496258A2, EP1496258A3, EP1496258B1, EP1496259A2, EP1496259A3, EP1496260A2, EP1496260A3, EP1496260B1, US6672846, US20020159898|
|Publication number||10806087, 806087, US RE41955 E1, US RE41955E1, US-E1-RE41955, USRE41955 E1, USRE41955E1|
|Inventors||Rajan Rajendran, John P. Sheridan, Carl H. Knapke|
|Original Assignee||Emerson Climate Technologies, Inc.|
|Export Citation||BiBTeX, EndNote, RefMan|
|Patent Citations (105), Non-Patent Citations (9), Classifications (38), Legal Events (3)|
|External Links: USPTO, USPTO Assignment, Espacenet|
The present invention relates to plural compressors disposed within a single shell. More particularly, the present invention relates to plural compressors disposed within a single shell which are driven by the same motor.
Due to energy cost and conservation, there is a demand for refrigerant motor-compressor units which have an output which can be varied in accordance with demand. To satisfy this demand, many different systems have been proposed. One such system involves the unloading of one or more cylinders in a multi-cylinder compressor or the varying of re-expansion volume for the purpose of varying the output of the compressor system. These systems tend to be relatively complex and the efficiency of the compressor system in the unloaded state is not optimum. Variable speed compressors have also been used, but they require expensive controls and also the speed control and motor-compressor efficiency present some efficiency issues at least when operating in a reduced output condition.
Compressor systems have also been developed which, in place of a single compressor large enough to carry the maximum load, include a plurality of smaller motor-compressors having a combined output equal to the required maximum. These multi-compressor systems include means for controlling the total system in such a manner as to selectively activate and deactivate less than all of the compressors when it is desired to vary the output. These multi-compressor units have good efficiency but they require complex hook-up plumbing, including means for dealing with lubricating oil management in order to ensure that all the oil remains equally distributed between each of the compressors.
Further development of the multi-compressor systems has included the incorporation of a plurality of standard motor compressor units in a common shell. The common shell maximizes the compactness of the system and provides a common oil sump for equal oil distribution, a common suction gas inlet and a common discharge gas outlet. These single shell multi-compressor units have proved to be acceptable in the marketplace but they tend to be relatively large and the means for controlling the total system is still somewhat complex.
The continued development of multi-compressor systems has been directed towards reducing the overall costs and the overall size as well as simplifying the control systems which dictate the output quantity of these systems.
The present invention provides the art with a dual compressor system with one compressor being located at opposite ends of a common drive shaft. A motor rotor is press fit to the center portion of the drive shaft and the motor rotor is disposed within a motor stator. Thus, both compressors are powered by the same motor. The control of the output of the dual compressor system is accomplished by a variable speed motor or by a pulsed width modulation (PWM) capacity control system incorporated into one or both of the two compressors. When incorporating a variable speed motor for capacity control, the capacity can be varied from 0% to 100%. When incorporating the PWM capacity control system into one of the compressors, the capacity can be varied from 50% to 100%. When incorporating the PWM capacity control system into both compressors, the capacity can be varied from 0% to 100%. The capacity of one or both of the compressors can be increased to approximately 120% of capacity using vapor injection to increase the range of the dual compressor system if desired.
Further areas of applicability of the present invention will become apparent from the detailed description provided hereinafter. It should be understood that the detailed description and specific examples, while indicating the preferred embodiment of the invention, are intended for purposes of illustration only and are not intended to limit the scope of the invention.
The present invention will become more fully understood from the detailed description and the accompanying drawings, wherein:
The following description of the preferred embodiment(s) is merely exemplary in nature and is in no way intended to limit the invention, its application, or uses.
Referring now to the drawings in which like reference numerals designate like or corresponding parts throughout the several views, there is shown in
Major elements of compression system 10 that are affixed to frame 24 include a pair of two piece main bearing assemblies 26 and a motor stator 28. A drive shaft or crankshaft 30 having a pair of eccentric crank pins 32 at opposite ends thereof is rotatably journaled in a pair of bearings 34 each secured within an oil pump 36 secured to a respective main bearing assembly 26. Crankshaft 30 has at each end thereof an axially extending bore 38 which communicates with a respective radial extending bore 40 to provide lubricating oil to the moving components of compressor system 10. The lower portion of shell 12 defines an oil sump 42 which is filled with lubricating oil to a level slightly above the lower end of a rotor 44. Each oil pump 36 draws oil from oil sump 42 and pumps the oil into a chamber 46 defined by oil pump 36 and main bearing assembly 26. A seal 48 seals each chamber 46 and a drain port (not shown) maintains the oil level within chamber 46. Oil from chamber 46 flows through radial bore 40 into axial extending bore 38 and to the moving components of compressor system 10 which require lubrication.
Crankshaft 30 is rotatably driven by an electric motor which includes stator 28, windings 50 passing therethrough and rotor 44 press fitted on crankshaft 30. A pair of counterweights 52 are secured to opposite ends of crankshaft 30 adjacent a respective crank pin 32.
The upper surface of each two-piece main bearing assembly 26 is provided with a flat thrust bearing surface 54 on which is disposed a respective orbiting scroll member 56 having the usual spiral vane or wrap 58 extending outwardly from an end plate 60. Projecting outwardly from the lower surface of each end plate 60 of each orbiting scroll member 56 is a cylindrical hub 62 having a journal bearing therein and in which is rotatively disposed a drive bushing 66 having an inner bore in which a respective crank pin 32 is drivingly disposed. Each crank pin 32 has a flat on one surface which drivingly engages a flat surface formed in a portion of the inner bore of each drive bushing 66 to provide a radially compliant driving arrangement, such as shown in Assignee's U.S. Pat. No. 4,877,382, the disclosure of which is hereby incorporated herein by reference. A pair of Oldham couplings 68 is also provided positioned between each orbiting scroll member 56 and each two-piece bearing housing assembly 26. Each Oldham coupling 68 is keyed to a respective orbiting scroll member 56 and to a respective non-orbiting scroll member 70 to prevent rotation of a respective orbiting scroll member 56.
Each non-orbiting scroll member 70 is also provided with a wrap 72 extending outwardly from an end plate 74 which is positioned in meshing engagement with a respective wrap 58 of a respective orbiting scroll member 56. Each non-orbiting scroll member 70 has a centrally disposed discharge 5 passage 76 which communicates with a centrally open recess 78 which is in turn in fluid communication with a respective discharge pressure chamber 80 defined by each end cap 14 and each partition 22. An annular recess 82 is also formed in each non-orbiting scroll member 70 within which is disposed a respective floating seal assembly 84.
Recesses 78 and 82 and floating seal assemblies 84 cooperate to define axial pressure biasing chambers which receive pressurized fluid being compressed by respective wraps 58 and 72 so as to exert an axial biasing force on a respective non-orbiting scroll member 70 to thereby urge the tips of respective wraps 58 and 72 into sealing engagement with the opposed end plate surfaces of end plates 74 and 60, respectively. Floating seal assemblies 84 are preferably of the type described in greater detail in Assignee's U.S. Pat. No. 5,156,539, the disclosure of which is hereby incorporated herein by reference. Non-orbiting scroll members are designed to be mounted for limited axial movement to a respective two-piece main bearing housing assembly 26 in a suitable manner such as disclosed in the aforementioned U.S. Pat. No. 4,877,382 or Assignee's U.S. Pat. No. 5,102,316, the disclosure of which is hereby incorporated herein by reference.
Shell 12 defines a suction pressure chamber 90 which receives a gas for compression from suction gas inlet fitting 18. The gas within suction pressure chamber 90 is taken in at the radially outer portion of both sets of intermeshed scrolls 56 and 70, it is compressed by both sets of wraps 58 and 72 and it is discharged into a respective discharge pressure zone 80 through discharge passage 76 and recesses 78. The compressed gas exits each discharge pressure zone 80 through respective discharge fittings 20. Tubing (not shown) secured to each discharge fitting combine gas from both discharge fittings 20 to a common tube (not shown) which is then piped to the apparatus utilizing the compressed gas.
When it is desired to incorporate a capacity control system into compression system 10, the electric motor can be designed as a variable speed motor. The design for the variable speed motor which includes stator 28, windings 50 and rotor 44 are well known in the art and will not be discussed in detail. By providing variable speed capacity to the electric motor, the capacity of compressor 10 can be varied between 0% and 100%.
Referring now to
Control system 112 includes a discharge fitting 114, a piston 116, a shell fitting 118, a solenoid valve 120, a control module 122 and a sensor array 124 having one or more appropriate sensors. Discharge fitting 114 is threadingly received or otherwise secured within open recess 78. Discharge fitting 114 defines an internal cavity 126 and a plurality of discharge passages 128. A discharge valve 130 is disposed below fitting 114 and below cavity 126. Thus, pressurized gas overcomes the biasing load of discharge valve 130 to open discharge valve 130 and allowing the pressurized gas to flow into cavity 126, through passages 128 and into discharge pressure chamber 80.
Referring now to
In order to bias non-orbiting scroll member 70 into sealing engagement with orbiting scroll member 56 for normal full load operation, solenoid valve 120 is deactivated (or it is activated) by control module 122 in response to sensor array 124 to block fluid flow between tubes 150 and tube 152. In this position, chamber 146 is in communication with discharge pressure chamber 80 through passageway 142 and orifice 144. The pressurized fluid at discharge pressure within chambers 80 and 146 will act against opposite sides of piston 16 thus allowing for the normal biasing of non-orbiting scroll member 70 towards orbiting scroll member 56 to sealingly engage the axial ends of each scroll member with the respective end plate of the opposite scroll member. The axial sealing of the two scroll members 56 and 70 causes compressor system 110 to operate at 100% capacity.
In order to unload compressor system 110, solenoid valve 120 will be actuated (or it will be deactuated) by control module 122 in response to sensor array 124. When solenoid valve 120 is actuated (or unactuated), suction pressure chamber 90 is in direct communication with chamber 146 through suction fitting 18, tube 152, solenoid valve 120 and rube 150. With the discharge pressure pressurized fluid released to suction from chamber 146, the pressure difference on opposite sides of piston 116 will move non-orbiting scroll member 70 to the right as shown in
Control module 122 is in communication with sensor array 124 to provide the required information for control module 122 to determine the degree of unloading required for the particular conditions of the refrigeration system including compressor system 110 existing at that time. Based upon this information, control module 122 will operate solenoid valve 120 in a pulsed width modulation mode to alternately place chamber 146 in communication with discharge pressure chamber 80 and suction pressure chamber 90. The frequency with which solenoid valve 120 is operated in the pulsed width modulated mode will determine the percent capacity of operation of one set of scrolls 56 and 70 of compressor system 110. As the sensed conditions change, control module 122 will vary the frequency of operation for solenoid valve 120 and thus the relative time periods at which one set of scrolls 56 and 70 of compressor system 110 is operated in a loaded and unloaded condition. The varying of the frequency of operation of solenoid valve 120 can cause the operation of one set of scrolls 56 and 70 between fully loaded or 100% capacity and completely unloaded or 0% capacity or at any of an infinite number of settings in between in response to system demands. This has the effect of varying the capacity of compressor system 110 between 50% and 100%.
Referring now to
Referring now to
The incorporation of flash tank 198 and the remainder of vapor injection system 168, allows the capacity of one set of scrolls 56 and 70 of compressor system 110 to increase above the fixed capacity of one set of scrolls 56 and 70 of compressor system 110. Typically, at standard air conditioning conditions, the capacity of one of the scrolls can be increased by approximately 20% to provide one set of the scrolls with 120% of its capacity which is 110% of the capacity of compressor system 110 as shown in the graph in FIG. 11. In order to be able to control the capacity of one set of scrolls 56 and 70 of compressor system 110, a solenoid valve 208 is positioned within piping 206. The amount of percent increase in the capacity of one set of scrolls 58 and 70 of compressor system 110 can be controlled by operating solenoid valve 208 in a pulse width modulation mode. Solenoid valve 208 when operated in a pulse width modulation mode in combination with capacity control system 112 of compressor system 110 allows the capacity of compressor system 110 to be positioned anywhere along the line shown in FIG. 11.
Referring now to
The description of the invention is merely exemplary in nature and, thus, variations that do not depart from the gist of the invention are intended to be within the scope of the invention. Such variations are not to be regarded as a departure from the spirit and scope of the invention.
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|U.S. Classification||417/410.5, 417/426, 418/55.1|
|International Classification||F04B17/00, F04C29/12, F04C23/02, F04C28/08, F04C29/04, F04C23/00, F04C28/02, F04C18/02, F04C29/00, F04C27/00, F04C28/26|
|Cooperative Classification||Y02B30/741, F25B2600/2509, F25B2600/0253, F04C29/0014, F04C23/008, F04C28/08, F04C18/0215, F04C28/265, F04C23/001, F25B2400/075, F04C29/042, F25B1/04, F25B2600/0262, F04C29/122, F04C27/005|
|European Classification||F04C29/00B2, F04C23/00D, F04C28/08, F04C29/12B, F04C23/00B, F04C29/04B, F25B1/04, F04C27/00C, F04C18/02B2|
|Apr 26, 2007||AS||Assignment|
Owner name: EMERSON CLIMATE TECHNOLOGIES, INC., OHIO
Free format text: CERTIFICATE OF CONVERSION, ARTICLES OF FORMATION AND ASSIGNMENT;ASSIGNOR:COPELAND CORPORATION;REEL/FRAME:019215/0273
Effective date: 20060927
|Jul 6, 2011||FPAY||Fee payment|
Year of fee payment: 8
|Jul 6, 2015||FPAY||Fee payment|
Year of fee payment: 12