Patent Application
20240287990
This application claims priority to Chinese Application No. 202320402495.5 filed on Feb. 27, 2023, which is incorporated by reference herein in its entirety.
The disclosure relates to the technical field of compressors, in particular to a screw compressor, and further to a refrigeration system configured with the screw compressor.
Screw compressors are common equipment in industrial applications, which generally include single-stage screw compressors, two-stage screw compressors, and three-stage screw compressors etc. Among them, single-stage screw compressor, using a pair of screw-shaped rotors to make rotary movement in the cylinder to compress and transport gas and with a compressor main machine as its core component, is a type of positive displacement compressor. The gas is compressed through the volume change of the tooth space of the mutually meshing male and female rotors installed in parallel inside the rotor housing, causing periodic volume changes in the gas between the tooth space of the rotors, so that the gas is pushed from the suction side to the discharge side along the rotor axis, thus completing the three working processes of suction, compression, and discharge.
The existing two-stage screw compressors often adopt a two-stage single-machine form under high compression ratio conditions. However, due to the complex structure and numerous components, such compressors are high in cost and inconvenient to install. Therefore, it is necessary to simplify the internal structure of the screw compressors, so to improve reliability, reduce costs, and enhance market competitiveness.
In view of the foregoing, the disclosure provides a screw compressor, so as to solve or at least alleviate one or more of the aforementioned problems and other problems in the prior art, or to provide alternative technical solutions for the prior art.
According to the disclosure, a screw compressor is provided, comprising:
In a further embodiment of the screw compressor according to the disclosure, the connecting end of the first annular section and the connecting end of the second annular section form an intermediate section of the partition plate, where the intermediate section is located between the male rotor and the female rotor.
In another embodiment of the screw compressor according to the disclosure, the first annular section and the second annular section are integrally formed.
In yet another embodiment of the screw compressor according to the disclosure, the free end of the first annular section is provided with outlines that are the same or similar to the contour outlines of the male rotor teeth of the male rotor, the free end of the second annular section is provided with outlines that are the same or similar to the contour outlines of the female rotor teeth of the female rotor, and the intermediate section is provided with outlines that are the same or similar to the contour outlines of the male rotor teeth of the male rotor and/or the same or similar to the contour outlines of the female rotor teeth of the female rotor.
In still another embodiment of the screw compressor according to the disclosure, the partition plate further comprises a first annular extension section and a second annular extension section, wherein the first annular extension section is embedded in a groove of the male rotor, with one end thereof connected to the connecting end of the first annular section, and the second annular extension section is embedded in a groove of the female rotor, with one end thereof connected to the connecting end of the second annular section,
In a further embodiment of the screw compressor according to the disclosure, the other end of the first annular extension section is provided with outlines that are the same or similar to the contour outlines of the male rotor teeth of the male rotor, and the other end of the second annular extension section is provided with outlines that are the same or similar to the contour outlines of the female rotor teeth of the female rotor.
In another embodiment of the screw compressor according to the disclosure, the first annular extension section, the second annular extension section, the first annular section, and the second annular section are integrally formed.
In yet another embodiment of the screw compressor according to the disclosure, seal structures are respectively provided on the annular inner surface of the first annular section, the annular inner surface of the second annular section, the annular inner surface of the first annular extension section, and the annular inner surface of the second annular extension section.
In still another embodiment of the screw compressor according to the disclosure, the partition plate is made of metal; and/or the partition plate is fixed to the rotor housing by bolt connection.
In another embodiment of the screw compressor according to the disclosure, the low-pressure stage housing and the high-pressure stage housing are integrally constructed to form the rotor housing.
In yet another embodiment of the screw compressor according to the disclosure, the screw compressor comprises a gas replenishment structure that is arranged at the high-pressure stage housing and connected to a high-pressure stage suction chamber.
In addition, according to the solution of the disclosure, a refrigeration system is further provided, wherein the refrigeration system is configured with the screw compressor, a condenser, a throttling device, and an evaporator connected into a circuit.
It can be appreciated that the screw compressor according to the disclosure has a simple structure and compact layout. It achieves two-stage compression of the gaseous refrigerant entering the screw compressor merely through a pair of meshing male and female rotors, further improving the compression ratio and thus improving the compression efficiency of the screw compressor. In addition, it can save components, reduce manufacturing costs, and improve installation efficiency.
The technical solution of the disclosure will be described in further detail below in conjunction with the accompanying drawings and embodiments. However, it should be appreciated that these drawings are only designed for explanatory purposes and are intended to conceptually illustrate the structural configurations described herein, without the need to be drawn proportionally.
The content of the disclosure and the differences between the disclosure and the prior art can be understood by referring to the accompanying drawings and the text. The technical solution of the disclosure will be described in further detail below through the accompanying drawings and by enumerating some optional embodiments of the disclosure.
It should be noted that any technical features or solutions in the embodiments are one or several of multiple optional technical features or technical solutions. For brevity, it is neither possible to exhaustively enumerate herein all alternative technical features and technical solutions of the disclosure, nor is it possible to emphasize that the implementation of each technical feature is one of the optional multiple implementations. Therefore, those skilled in the art should be appreciate that any technical means provided by the disclosure can be substituted, or any two or more technical means or technical features provided by the disclosure can be combined with each other to obtain a new technical solution.
Any technical feature or technical solution within the embodiments does not limit the scope of protection of the disclosure. The scope of protection of the disclosure should include any alternative technical solutions that those skilled in the art can think of without creative labor, as well as any new technical solutions obtained by those skilled in the art by combining any two or more technical means or technical features provided by the disclosure.
It should be emphasized that the partition plate 300 is an important component of the two-stage screw compressor of the disclosure, which constitutes the discharge port for low-pressure/first-stage compression and the suction port for high-pressure/second-stage compression. The basic structure of the partition plate and its relative positional relationship, mutual cooperation, and connection relationship with other surrounding components will be described in detail below in conjunction with the appended drawings.
In the embodiment shown in
With continued reference to
In addition, the diameter of the annular outer surface of the first annular section 310 is the same or substantially the same as the diameter of the circle where the tooth tips of the male rotor teeth of the male rotor 110 are located. For example, the diameter of the annular outer surface of the first annular section 310 is slightly larger than the diameter of the circle where the tooth tips of the male rotor teeth of the male rotor 110 are located. Specifically, due to the relative rotation of the male rotor 110 and the rotor housing 200, a small gap can be left between the two, and the annular outer surface of the first annular section 310 can be tightly fixed to the rotor housing 200. The diameter of the annular inner surface of the first annular section 310 is the same or substantially the same as the diameter of the main shaft A of the male rotor 110. For example, the diameter of the annular inner surface of the first annular section 310 is slightly larger than the diameter of the main shaft A of the male rotor 110. Meanwhile, the diameter of the annular outer surface of the second annular section 320 is the same or substantially the same as the diameter of the circle where the tooth tips of the female rotor teeth of the female rotor 120 are located. For example, the diameter of the annular outer surface of the second annular section 320 is slightly larger than the diameter of the circle where the tooth tips of the female rotor teeth of the female rotor 120 are located. Due to the relative rotation between the female rotor 120 and the rotor housing 200, a small gap can be left between the two, and the annular outer surface of the second annular section 320 can be tightly fixed to the rotor housing 200. The diameter of the annular inner surface of the second annular section 320 is the same or substantially the same as the diameter of the main shaft B of the female rotor 120. For example, the diameter of the annular inner surface of the second annular section 320 is slightly larger than the diameter of the main shaft B of the female rotor 120. When installing a screw compressor, the operator can first embed or sleeve the first annular section 310 and the second annular section 320 of the partition plate 300 into the groove of the male rotor 110 and that of the female rotor 120, respectively, and insert the rotor set 100 together with the partition plate 300 into the accommodating chamber of the rotor housing 200, thereby simplifying the installation steps. In this case, the low-pressure stage housing 210 and the high-pressure stage housing 220 can be constructed as one to form the rotor housing 200, as shown in
In combination with the above embodiments, in other optional embodiments, the connecting end 312 of the first annular section 310 and the connecting end 322 of the second annular section 320 form the intermediate section 330 of the partition plate 300, where the intermediate section 330 is located between the male rotor 110 and the female rotor 120. For the convenience of manufacture, the first annular section 310 and the second annular section 320 can be integrally formed. In addition, in order to improve compression efficiency, the free end 311 of the first annular section 310 can be provided with outlines that are the same or similar to the contour outlines of the male rotor teeth of the male rotor 110, and the free end 321 of the second annular section 320 can be provided with outlines that are the same or similar to the contour outlines of the female rotor teeth of the female rotor 120. In addition, the intermediate section 330 is provided with outlines that are the same or similar to the contour outlines of the male rotor teeth of the male rotor 110, and/or the outlines that are the same or similar to the contour outlines of the female rotor teeth of the female rotor 120.
In another embodiment of the partition plate of the screw compressor disclosed according to the disclosure as shown in
On the one hand, the end face of the first annular extension section 340a facing the high-pressure stage housing 220 is configured to be flush with the end face of the first annular section 310a facing the high-pressure stage housing 220, and the end face of the second annular extension section 350a facing the high-pressure stage housing 220 is configured to be flush with the end face of the second annular section 320a facing the high-pressure stage housing 220. On the other hand, the width of the first annular extension section 340a in the axial direction is the same as the width of the second annular extension section 350a in the axial direction, and is smaller than the width of the first annular section 310a in the axial direction and the width of the second annular section 320a in the axial direction, so that the area of the second-stage suction port 250 is smaller than the area of the first-stage discharge port 240, thus further improving the compression ratio of the second stage.
For the convenience of manufacture, the first annular extension section 340a and the second annular extension section 350a can be designed to be integrally formed with the first annular section 310a and the second annular section 320a. In this case, in order to install the integrally formed partition plate 300a into the groove of the rotor set 100, the partition plate 300a can be divided into independent two or more sections along the dashed line in
Those skilled in the art can readily contemplate that the annular inner surface of the first annular section 310a, the annular inner surface of the second annular section 320a, the annular inner surface of the first annular extension section 340a, and the annular inner surface of the second annular extension section 350a are respectively provided with seal structures (not shown), such as labyrinth seal structures, or contact or non-contact rotary seal structures such as oil groove seals, sliding ring seals, lip seals, etc., so as to prevent refrigerant gas leakage. In this case, the gap between the inner diameter of the seal structure and the bottom surface of the grooves of the rotor set is designed to be no more than 2 mm.
As an alternative solution, the screw compressor 10 also comprises a gas replenishment structure 400 for introducing refrigerant gas from, for example, an economizer, into the second-stage suction port 250. Specifically, the gas replenishment structure is arranged at the high-pressure stage housing 220, and the gas replenishment structure 400 is connected to the high-pressure stage suction chamber (i.e., the position of the second-stage suction port 250). Referring to
In addition, the disclosure further provides a refrigeration system configured with the aforementioned screw compressor. The refrigeration system comprises a cooling tower, a water chilling unit, and a pumping device, etc. connected through pipelines, wherein the water chilling unit is composed of the aforementioned screw compressor, a condenser, a throttling device, an evaporator, and other components connected into a circuit.
If terms such as “first” and “second” are used herein to limit components, those skilled in the art should be aware that the use of “first” and “second” is only for the purpose of distinguishing components in terms of depiction. Unless otherwise stated, the above terms do not have any special meanings.
Furthermore, as to the terms used to indicate positional relationships or shapes in any of the technical solutions disclosed in the disclosure, unless otherwise stated, the implications thereof include states or shapes that are approximate, similar, or close to them. Any component provided by the disclosure can be either assembled from multiple individual components or manufactured as a separate component using an integration process.
If terms such as “center”, “longitudinal”, “transverse”, “front”, “back”, “left”, “right”, “vertical”, “horizontal”, “top”, “bottom”, “inside”, “outside”, etc. are used in the depiction of the disclosure, the orientations or positional relationships indicated by the above terms are based on the orientations or positional relationships shown in the drawings. These terms are used merely for the convenience of describing the disclosure and simplifying the description, rather than indicating or implying that the device, mechanism, component or element referred to must have a specific orientation, be constructed and operated in a specific orientation, so they cannot be understood as forming limitations on the scope of protection of the disclosure.
Last, it should be noted that the above embodiments are only used to illustrate the technical solution of the disclosure but not to limit it. Although the disclosure has been described in detail with reference to preferred embodiments, those skilled in the art, however, should understand that the specific embodiments of the disclosure can still be modified or some technical features can be equivalently substituted. Without departing from the spirit of the technical solution of the disclosure, all of these modified embodiments or technical features used for equivalent substitution should fall within the scope of the claimed technical solution of the disclosure.
| Number | Date | Country | Kind |
|---|---|---|---|
| 202320402495.5 | Feb 2023 | CN | national |
