Patent Application
20090185921
The present invention generally relates to scroll compressors for compressing refrigerant and more particularly relates to electrical control boxes, electrical couplings, powering sources and protection modules for such scroll compressors and/or other such suitable compressors.
A scroll compressor is a certain type of compressor that is used to compress refrigerant for such applications as refrigeration, air conditioning, industrial cooling and freezer applications, and/or other applications where compressed fluid may be used. Such prior scroll compressors are known, for example, as exemplified in U.S. Pat. Nos. 6,398,530 to Hasemann; 6,814,551, to Kammhoff et al.; 6,960,070 to Kammhoff et al.; and 7,112,046 to Kammhoff et al., all of which are assigned to a Bitzer entity closely related to the present assignee. As the present disclosure pertains to improvements that can be implemented in these or other scroll compressor designs, the entire disclosures of U.S. Pat. Nos. 6,398,530; 7,112,046; 6,814,551; and 6,960,070 are hereby incorporated by reference in their entireties.
As is exemplified by these patents, scroll compressors conventionally include an outer housing having a scroll compressor contained therein. A scroll compressor includes first and second scroll compressor members. A first compressor member is typically arranged stationary and fixed in the outer housing. A second scroll compressor member is moveable relative to the first scroll compressor member in order to compress refrigerant between respective scroll ribs which rise above the respective bases and engage in one another. Conventionally the moveable scroll compressor member is driven about an orbital path about a central axis for the purposes of compressing refrigerant. An appropriate drive unit, typically an electric motor, is provided usually within the same housing to drive the movable scroll member.
Scroll compressors conventionally include a protection module and a power connector which are typically contained within the control box mounted to the outside of the scroll compressor housing. An electrician will typically couple control leads to the protection module and will also separately couple electrical power leads to a power connector. While this typically works well, electrician error can lead to improper electrical coupling of various leads to the scroll compressor electrical devices. If the leads are incorrectly installed, it can cause damage to the scroll compressor. For example, if the scroll compressor is hooked up incorrectly and caused to run in reverse, a vacuum condition is created between the scroll compressor bodies which can cause the scroll compressor bodies to be urged toward one another.
The present invention is directed toward reducing the propensity for error in the installation and electrical coupling of such scroll compressors.
In one aspect, the invention provides a compressor for compressing fluid having a terminal block for electrical hook-ups. The compressor includes a compressor section; a drive unit operative to drive the compressor section for compressing fluid; a protection module; and a power connector for connecting electrical power to the drive unit to facilitate operation of the scroll compressor bodies. The terminal block provides for connection to at least one of the protection module and the power connector. At least one power lead connects the terminal block and the power connector.
Another aspect is directed toward a method of electrically configuring a compressor with a terminal block for user interface. The method includes mounting a compressor section and a drive unit in a housing with the drive unit operable to drive the compressor section to facilitate compression of fluid; connecting a power connector to the drive unit; and electrically connecting a protection module to the drive unit. Further, the method includes electrically connecting a terminal block to at least one of the protection module and the power connector.
A further aspect or advantage can be realized when different electrical configurations are provided across different compressors either due to a design change, redesign, different model or other desired reason. As such the method may also include arranging or configuring at least one of the power module and the power connector differently across at least two different compressors; and maintaining a common lead configuration for the terminal block among said at least two different compressors, whereby any changes are transparent to an end user.
Other aspects, objectives and advantages of the invention will become more apparent from the following detailed description when taken in conjunction with the accompanying drawings.
The accompanying drawings incorporated in and forming a part of the specification illustrate several aspects of the present invention and, together with the description, serve to explain the principles of the invention. In the drawings:
While the invention will be described in connection with certain preferred embodiments, there is no intent to limit it to those embodiments. On the contrary, the intent is to cover all alternatives, modifications and equivalents as included within the spirit and scope of the invention as defined by the appended claims.
Referring to
Before turning to the details of electrical configuration accomplished with the common terminal block 38, some background about the illustrated scroll compressor assembly will be provided for reference, although it is understood that this invention is applicable to other compressor configurations. The illustrated scroll compressor assembly 10 generally includes an outer housing 16 (which may be made of several sheet metal shell sections) containing scroll compressor bodies to include a fixed scroll compressor body 18 and a moveable scroll compressor body 20. A drive unit in the form of a electrical motor 22 is provided for driving the moveable scroll compressor body 20 relative to the fixed scroll compressor body 18 to facilitate compression of fluid. To this end, the scroll compressor bodies have respective bases 24 and scroll ribs 26 that project from their respective bases and which mutually engage about an axis for creating chambers for compressing fluid. The electrical motor 22 is operative to provide rotational output on a drive shaft 28, which includes an offset eccentric drive 30 that provides an eccentric orbiting movement to the moveable scroll compressor body 20 relative to the fixed scroll compressor body 18. The scroll compressor bodies provide for a compressor section for the compressor, while the electrical motor provides for a drive section of the scroll compressor.
The control box 14 is mounted exteriorly to the housing 16. A hole 32 through the housing allows for electrical leads to go between the electrical motor 22 within the scroll compressor to the electrical control box 14 to facilitate a power supply for powering the scroll compressor.
Within the control box 14 are provided a variety of electrical devices to include a power connector 34 for connecting electrical power to the electrical motor to operate the electrical motor and thereby the scroll compressor section. The power connector also typically provides a seal to prevent refrigerant within the outer housing 16 from leaking out as well as to prevent outside air from leaking in. Also provided is the protection module 36 that can receive control leads (e.g. leads that carry on and off signals or variable control signals) and has the ability to protect the electrical motor 22 and the scroll compressor from shorts, power surges, overheating, or provide other suitable electrical conditioning as may be appropriate. In accordance with the present invention, the terminal block 38 is provided in spaced relation of the power connector 34 and the protection module 36 and is connected to at least one and preferably both of the protection module 36 and the power connector 34 as schematically illustrated in
Referring to
The terminal block 38 generally includes an insulating body 44 that takes the form of a rectangular strip and a plurality of screw clamps 46 that are arranged in two rows in which adjacent screw clamps 46 (one clamp from each row) are electrically coupled together through a metal contacts strip or otherwise in electrical communication. As shown, the terminal block 38 includes a total of ten screw clamps 46 in which each row includes five screw clamps. The screw clamps provided for electrical couplings for connecting to control leads or power leads.
As illustrated, the terminal block 38 in the first embodiment of
An electrician can then wire control leads 54 which typically will extend through a punched out hole in the wall 40 of the control box 14 to the terminal block to provide for outside electrical connection to the protection module 36; and the electrician will also separately wire appropriate external power source leads 56 to the terminal block 38 and thereby connect to the electrical power connector 34. The electrician can use the color coding provided by electrical power leads 50, 51 and 52 to appropriately connect the power source leads 56 in corresponding fashion (e.g. each one of the external power source leads 56 may a corresponding color to one of the power leads 50-51).
One significant advantage of utilizing a terminal block 38 within the control box 14 is that different electrical box configurations and/or arrangements of the protection module 36 and/or the power connector 34 within the control box does not affect the electrical installation as any changes can be transparent to the user. Specifically, and referring to a further embodiment of
While not shown in
The transparency achieved by the terminal blocks 38, 138 of different embodiments to an end user such as an electrician will help prevent mistakes among electricians and how they wire and hook up scroll compressors. As a result, difficulties do not arise when changes are made to the scroll compressor and/or to the configuration of devices and/or wires within a control box. By adding an additional component of the terminal block, the electrical hook up and configuration can be simplified.
All references, including publications, patent applications, and patents cited herein are hereby incorporated by reference to the same extent as if each reference were individually and specifically indicated to be incorporated by reference and were set forth in its entirety herein.
The use of the terms “a” and “an” and “the” and similar referents in the context of describing the invention (especially in the context of the following claims) is to be construed to cover both the singular and the plural, unless otherwise indicated herein or clearly contradicted by context. The terms “comprising,” “having,” “including,” and “containing” are to be construed as open-ended terms (i.e., meaning “including, but not limited to,”) unless otherwise noted. Recitation of ranges of values herein are merely intended to serve as a shorthand method of referring individually to each separate value falling within the range, unless otherwise indicated herein, and each separate value is incorporated into the specification as if it were individually recited herein. All methods described herein can be performed in any suitable order unless otherwise indicated herein or otherwise clearly contradicted by context. The use of any and all examples, or exemplary language (e.g., “such as”) provided herein, is intended merely to better illuminate the invention and does not pose a limitation on the scope of the invention unless otherwise claimed. No language in the specification should be construed as indicating any non-claimed element as essential to the practice of the invention.
Preferred embodiments of this invention are described herein, including the best mode known to the inventors for carrying out the invention. Variations of those preferred embodiments may become apparent to those of ordinary skill in the art upon reading the foregoing description. The inventors expect skilled artisans to employ such variations as appropriate, and the inventors intend for the invention to be practiced otherwise than as specifically described herein. Accordingly, this invention includes all modifications and equivalents of the subject matter recited in the claims appended hereto as permitted by applicable law. Moreover, any combination of the above-described elements in all possible variations thereof is encompassed by the invention unless otherwise indicated herein or otherwise clearly contradicted by context.
