SCREW COMPRESSOR WITH ECONOMIZER
A screw compressor for connecting with an economizer for gas supply, includes a main body defining a compressor cavity, a male rotor and a female rotor received in the compressor cavity, a gas-vent base defining at least one gas-supply hole therein adapted for communicating with the economizer. The male rotor and the female rotor are parallel to and meshed with each other. At least the male rotor includes at least two teeth defining at least one tooth channel therebetween. The gas-supply hole is axially aligned with the at least one tooth channel to let gas from the economizer pass therethrough and enter into the at least one tooth channel along the axial direction of the male rotor.
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The present invention relates to a screw compressor, more particularly to a screw compressor with economizer.
BACKGROUND OF THE INVENTIONA screw compressor is one of the most common types of rotary compressors and comprises a pair of parallel, meshed male and female rotors. To improve the efficiency of a compressor, an energy-saving cycle system with an economizer is often utilized. Please refer to
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The disadvantages of the radially-arranged gas-supply hole 10′ of an economizer is: the time for a complete gas-supply process of the screw compressor is too long, thus may cause potential backflow, and then cause a series of bad results of influencing the performances of the screw compressor, vibration of pipes, generating high temperature at gas-supply hole area, and high noises etc.
SUMMARY OF THE INVENTIONAccordingly, an object of the present invention is to provide a screw compressor which is capable of supplying gaseous refrigerating working medium to a compressor cavity in shorter time for eliminating or reducing potential backflow of airflow.
In order to achieve the above-mentioned object, a screw compressor adapted for connecting with an economizer for gas supply, comprises a main body defining a compressor cavity, a male rotor and a female rotor received in the compressor cavity, a gas-vent base defining at least one gas-supply hole therein adapted for communicating with said economizer. The male rotor and the female rotor are parallel to and meshed with each other. At least the male rotor comprises at least two teeth defining at least one tooth channel therebetween. The gas-supply hole is axially aligned with the at least one tooth channel to let gas from the economizer pass therethrough and enter into the at least one tooth channel along the axial direction of the male rotor.
The foregoing has outlined rather broadly the features and technical advantages of the present invention in order that the detailed description of the invention that follows may be better understood. Additional features and advantages of the invention will be described hereinafter, which form the subject of the claims of the invention.
For a more complete understanding of the present invention, and the advantages thereof, reference is now made to the following descriptions taken in conjunction with the accompanying drawings, in which:
In the following description, numerous specific details are set forth to provide a thorough understanding of the present invention. However, it will be obvious to those skilled in the art that the present invention may be practiced without such specific details. In other instances, well-known circuits have been shown in block diagram form in order not to obscure the present invention in unnecessary detail. For the most part, details concerning timing considerations and the like have been omitted inasmuch as such details are not necessary to obtain a complete understanding of the present invention and are within the skills of persons of ordinary skill in the relevant art.
Reference will be made to the drawing figures to describe the present invention in detail, wherein depicted elements are not necessarily shown to scale and wherein like or similar elements are designated by same or similar reference numeral through the several views and same or similar terminology.
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The gas-supply hole 10 also could have alternative shapes, such as a substantial circle, rectangular shape, or a flat bar shape et al. according to the tooth shape of the male rotor 30. As shown in
The economizer also could be equipped with a plurality of gas-supply holes 10 defined in the gas-vent base 50 symmetrically or asymmetrically.
The gas supply process includes steps as follows:
S1) As shown in
S2) the male rotor 30 rotates along an anticlockwise direction with the second lateral edge 304 of the first tooth 301 substantially anastomosing with the second lateral boundary 102 of the gas-supply hole 10 to be ready to communicate with the gas-supply hole 10 for gas supply (as shown in
S3) the male rotor 30 continues rotating along the anticlockwise direction, and the tooth channel 60 becomes communicating with the gas-supply hole 10 until reaching the largest area for gas supply (as shown in
S4) then the male rotor 30 continues rotating with the first lateral edge 303 of the second tooth 302 substantially anastomosing with the first lateral boundary 101 of the gas-supply hole 10, the gas supply process this time finishes (as shown in
S5) turning to S1 to repeat S1 to S4 until the whole gas supply process finishes.
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In summary, the screw compressor 100 of the present invention is capable of feeding gaseous refrigerating working medium into the compressor cavity in a shorter time for eliminating or reducing potential backflow, hence optimizing the performances of the economizer artificially.
It is to be understood, however, that even though numerous characteristics and advantages of the present invention have been set forth in the foregoing description, together with details of the structure and function of the invention, the disclosure is illustrative only, and changes may be made in detail, especially in matters of shape, size, and arrangement of parts within the principles of the invention to the full extent indicated by the broad general meaning of the terms in which the appended claims are expressed. For example, the tongue portion is extended in its length or is arranged on a reverse side thereof opposite to the supporting side with other contacts but still holding the contacts with an arrangement indicated by the broad general meaning of the terms in which the appended claims are expressed.
Claims
1. A screw compressor adapted for connecting with an economizer for gas supply, comprising:
- a main body defining a compressor cavity;
- a male rotor and a female rotor received in the compressor cavity, the male rotor and the female rotor meshed with each other, and at least the male rotor comprising at least two teeth defining at least one tooth channel therebetween;
- a gas-vent base defining at least one gas-supply hole therein adapted for communicating with said economizer; and wherein the gas-supply hole is axially aligned with the at least one tooth channel to let gas from the economizer pass therethrough and enter into the at least one tooth channel along the axial direction of the male rotor.
2. The screw compressor as claimed in claim 1, wherein the outer contour of the gas-supply hole is similar to that of the tooth of the male rotor.
3. The screw compressor as claimed in claim 2, wherein the area of the gas-supply hole is no larger than that of the tooth.
4. The screw compressor as claimed in claim 1, wherein the gas-supply hole rotates at a first angle, while the male rotor rotates at a second angle of the at least tooth channel, and wherein the first angle of the gas-supply hole is always smaller than the second angle of the at least one tooth channel.
5. The screw compressor as claimed in claim 1, wherein the gas-supply hole comprises first and second lateral boundaries and a bottom boundary connecting with the first and second lateral boundaries, and the tooth of the male rotor comprises first and second lateral edges, and wherein as the male rotor rotates, the first and second lateral boundaries of the gas-supply hole is capable of partially anastomosing with the first and second lateral edges of the male rotor.
6. The screw compressor as claimed in claim 1, wherein the gas-supply hole has at least one of the shapes of triangle, circle, rectangular, flat bar.
7. The screw compressor as claimed in claim 1, wherein the gas-vent base defines a plurality of gas-supply holes therethrough to communicate with said economizer and the at least one tooth channel of the male rotor.
8. The screw compressor as claimed in claim 1, wherein the screw compressor is a dual-screw compressor.
9. The screw compressor as claimed in claim 1, wherein the screw compressor is a triple-screw compressor.
10. The screw compressor as claimed in claim 5, wherein the at least two teeth of the male rotor comprises a first tooth and a second tooth, and wherein before the gas-supply hole communicates with the at least one tooth channel, the male rotor rotates to such a position that the second lateral boundary of the gas-supply hole partially anastomoses with the second lateral edge of the first tooth.
11. The screw compressor as claimed in claim 10, wherein as the gas-supply hole is going to separate from the at least one tooth channel, the male rotor rotates to such a position that the first lateral boundary of the gas-supply hole partially anastomoses with the first lateral edge of the second tooth.
Type: Application
Filed: Dec 1, 2010
Publication Date: Mar 8, 2012
Applicant: SHANGHAI POWER TECH. SCREW MACHINERY CO., LTD. (Shanghai)
Inventor: Yan Tang (Shanghai)
Application Number: 13/148,943
International Classification: F01C 1/16 (20060101);