Single screw compressor sealing system and single screw compressor

Abstract

The present invention discloses a single-screw compressor sealing system and a single-screw compressor. The single-screw compressor sealing system includes: a housing provided with a first liquid spray port; a screw rotatably disposed on the housing; two star wheels rotatably disposed on the housing, the two star wheels being respectively disposed on both sides of the screw and meshing with the screw; a compression chamber being jointly defined between the screw, the star wheels, and the housing; a liquid supply device being connected to the compression chamber through the first liquid spray port; and a liquid sealing mechanism being disposed between the screw and the housing for sealing the gap between the screw and the housing. A liquid sealing mechanism is disposed between the screw and the housing for sealing the gap between the screw and the housing to prevent leakage of compressed gas, and the liquid sealing mechanism can ensure good sealing performance after long-term use, thereby increasing the service life of the single-screw compressor. The single-screw compressor includes the above-mentioned single-screw compressor sealing system, has good sealing effect, and has a long service life.

Description

Technical Field

[0001] The present invention relates to the technical field of compressors, and in particular to a single-screw compressor sealing system and a single-screw compressor. Background Art

[0002] A single-screw compressor consists of a screw and two symmetrically arranged planar planetary gears, forming a meshing pair and housed within a housing. During operation, the screw and planetary gear rotate at high speed relative to the housing. A certain clearance between the screw and housing, and between the planetary gear and housing, is required to ensure proper operation of the compressor. The efficiency of a single-screw compressor is largely determined by the clearances between the housing, screw, and planetary gear. These gaps allow compressed high-pressure gas to leak through these gaps to the low-pressure side, increasing exhaust losses, reducing compression power, and lowering compressor efficiency. Therefore, there is an urgent need for a single-screw compressor with excellent sealing and high compression efficiency. Summary of the Invention

[0003] The present invention aims to solve at least one of the technical problems existing in the prior art. To this end, the present invention provides a single-screw compressor sealing system with good sealing performance and long-term use.

[0004] The present invention also discloses a single-screw compressor, which includes the above-mentioned single-screw compressor sealing system.

[0005] A single-screw compressor sealing system according to a first embodiment of the present invention includes:

[0006] The housing is provided with a first liquid spray port;

[0007] a screw, rotatably disposed on the housing;

[0008] Two star wheels are rotatably arranged on the housing, and the two star wheels are respectively arranged on both sides of the screw and meshed with the screw;

[0009] The screw, the star wheel and the housing can jointly define a compression chamber;

[0010] a liquid supply device, connected to the compression chamber through the first liquid injection port;

[0011] A liquid sealing mechanism is provided between the screw and the housing for sealing a gap between the screw and the housing.

[0012] A single-screw compressor sealing system according to the first embodiment of the present invention has at least the following beneficial effects:

[0013] The sealing system of the above single-screw compressor is provided with a liquid sealing mechanism between the screw and the housing to seal the gap between the screw and the housing, prevent the compressed gas from leaking to the low-pressure side, reduce the exhaust loss of the compressor, and improve the efficiency of the compressor. The liquid sealing mechanism can ensure good sealing after long-term use, thereby increasing the service life of the single-screw compressor.

[0014] According to an embodiment of the first aspect of the present invention, the liquid sealing mechanism includes an annular groove provided on the outer peripheral surface of the screw and a second liquid spraying port provided on the housing and opposite to the annular groove.

[0015] According to the first aspect of the present invention, the annular groove and the inner wall of the shell jointly define a liquid seal cavity, the liquid supply device is connected to the liquid seal cavity through the second liquid spray port, and the liquid supply device is used to spray high-pressure liquid into the liquid seal cavity.

[0016] According to an embodiment of the first aspect of the present invention, the liquid sealing mechanism further includes a second sealing mechanism.

[0017] According to an embodiment of the first aspect of the present invention, the second sealing mechanism is a labyrinth sealing structure provided on both sides of the annular groove.

[0018] According to an embodiment of the first aspect of the present invention, the first liquid spraying port is obliquely arranged on the housing.

[0019] According to an embodiment of the first aspect of the present invention, two first liquid spraying ports are provided and the two first liquid spraying ports are centrally symmetrically distributed relative to the central symmetry axis of the screw.

[0020] According to an embodiment of the first aspect of the present invention, a sealing surface abutting against the star wheel is provided on the housing, and an area of ​​the sealing surface gradually increases along the direction in which the gas is compressed.

[0021] A single-screw compressor according to a second embodiment of the present invention includes the above-mentioned single-screw compressor sealing system.

[0022] A single-screw compressor according to an embodiment of the second aspect of the present invention has at least the following beneficial effects:

[0023] The screw and the housing are sealed by a liquid seal, and the liquid used is water, which prolongs the service life of the compressor, reduces the exhaust loss of the compressor, and improves the efficiency of the compressor.

[0024] Additional aspects and advantages of the present invention will be set forth in part in the description which follows and, in part, will be obvious from the description which follows, or may be learned by practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] The above and / or additional aspects and advantages of the present invention will become apparent and readily understood from the following description of the embodiments with reference to the accompanying drawings, in which:

[0026] Figure 1 This is a schematic structural diagram of a single-screw compressor sealing system according to an embodiment of the first aspect of the present invention;

[0027] Figure 2 This is a schematic structural diagram of a single-screw compressor sealing system according to an embodiment of the first aspect of the present invention;

[0028] Figure 3 for Figure 1 A schematic cross-sectional view of Example AA;

[0029] Figure 4 for Figure 3 A partial enlarged schematic diagram of Example C;

[0030] Figure 5 for Figure 1 A schematic cross-sectional view of Example BB;

[0031] Figure 6 This is a schematic structural diagram of a screw of a single-screw compressor sealing system according to the first embodiment of the present invention. DETAILED DESCRIPTION

[0032] The following describes embodiments of the present invention in detail. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended only to explain the present invention and are not to be construed as limiting the present invention.

[0033] In the description of the present invention, it should be understood that descriptions involving orientations, such as the orientations or positional relationships indicated by terms such as "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside" and "outside", are based on the orientations or positional relationships shown in the accompanying drawings and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0034] In the description of the present invention, "several" means one or more, "many" means more than two, "greater than," "less than," and "exceed" are understood to exclude the number itself, while "above," "below," and "within" are understood to include the number itself. The use of "first" and "second" in the description is solely for the purpose of distinguishing technical features and should not be construed as indicating or implying relative importance, implicitly specifying the number of the indicated technical features, or implicitly specifying the order of the indicated technical features.

[0035] In the description of the present invention, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood broadly. For example, they may refer to fixed, detachable, or integral connections; mechanical or electrical connections; direct or indirect connections through an intermediary; and internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on the specific circumstances.

[0036] like Figures 1 to 5 A single-screw compressor sealing system includes: a shell 100, which can be divided into a low-pressure area and a high-pressure area. The shell 100 is provided with an air inlet 110 and an air outlet 120. Preferably, the air inlet 110 is provided in the low-pressure area, and the air outlet 120 is provided in the high-pressure area. The shell 100 is also provided with a first liquid spray port 130. Preferably, the first liquid spray port 130 is provided in the low-pressure area of ​​the shell 100 and is directly opposite to the screw 200 provided in the shell 100; the screw 200 is rotatably provided on the shell 100, preferably, the screw 200 is rotatably mounted on the shell 100 through a bearing; two star wheels 300 are rotatably provided on the shell 100, preferably The star wheel 300 is mounted on the housing 100 via a bearing. The two star wheels 300 are respectively arranged on both sides of the screw 200 and mesh with the screw 200. The screw 200, the star wheel 300, and the housing 100 can collectively define a compression chamber 160, which is a space where air is compressed. The liquid supply device is connected to the compression chamber 160 through the first liquid spray port 130. The liquid supply device can spray a certain amount of liquid into the compression chamber 160 through the first liquid spray port 130. As the screw 200 rotates at high speed, the liquid in the compression chamber 160 is thrown into the gap between the screw 200, the star wheel 300, and the housing 100, thereby achieving a sealing and lubricating effect. A liquid sealing mechanism 400 is also provided between the screw 200 and the housing 100 for sealing the gap between the screw 200 and the housing 100. Preferably, the liquid sealing mechanism 400 is used to seal the gap between the outer peripheral surface of the screw 200 and the inner wall of the housing 100. Since the screw 200 rotates at high speed in the housing 100, a liquid sealing mechanism 400 is provided between the screw 200 and the housing 100. The liquid sealing mechanism 400 can ensure a good sealing effect between the screw 200 and the housing 100, thereby reducing leakage of compressed gas and extending the service life of the compressor.

[0037] like Figure 3 、 Figure 4 and Figure 6As shown, the liquid sealing mechanism 400 includes an annular groove 410 provided on the outer circumference of the screw 200 and a second liquid spraying port 420 provided on the housing 100 and opposite to the annular groove 410. A cylindrical portion 210 is provided on one end of the screw 200 to abut against the inner wall of the housing 100. The liquid sealing mechanism 400 is used to seal the gap between the outer circumference of the cylindrical portion 210 and the inner wall of the housing 100. The liquid sealing mechanism 400 includes an annular groove 410 provided on the outer circumference of the cylindrical portion 210 and a second liquid spraying port 420 provided on the housing 100 and opposite to the annular groove 410. Preferably, as shown in FIG. Figure 4 As shown, the second liquid injection port 420 is composed of multiple cylindrical holes of different diameters. The diameter of the cylindrical hole located on the outer wall of the housing 100 is smaller than the diameter of the cylindrical hole located on the inner wall of the housing 100, and the diameter of the cylindrical hole of the second liquid injection port 420 located on the inner wall of the housing 100 is smaller than the width of the annular groove 410. The second liquid injection port 420 is used to connect high-pressure liquid. The use of this structure of the second liquid injection port 420 can further increase the pressure of the liquid reaching the annular groove 410, allowing the high-pressure liquid to be more fully distributed in the annular groove, thereby enhancing the sealing effect. By providing an annular groove 410 for liquid sealing on the screw 200 and spraying high-pressure liquid into the annular groove 410 through the second liquid injection port 420 to achieve liquid sealing, the exhaust loss of the compressor is reduced and the efficiency of the compressor is improved.

[0038] like Figures 3 and 4 As shown, the annular groove 410 and the inner wall of the housing 100 jointly define a liquid seal chamber 430. The liquid supply device is connected to the liquid seal chamber 430 via the second liquid spray port 420. The liquid supply device is used to spray high-pressure liquid into the liquid seal chamber 430. The liquid supply device is connected to the second liquid spray port 420 and sprays high-pressure liquid into the liquid seal chamber 430 to achieve a seal. Because high-pressure compressed gas exists on one side of the liquid seal chamber 430, and the other side is a low-pressure side compared to the side with compressed gas, the high-pressure liquid sprayed into the liquid seal chamber 430 by the liquid supply device will flow out from the relatively low-pressure side after filling the liquid seal chamber 430. Preferably, a collection device connected to the liquid supply device is provided on the low-pressure side for collecting liquid flowing out of the low-pressure side. The liquid supply device not only provides liquid to the first liquid spray port 130, but also provides high-pressure liquid to the liquid seal mechanism 400. The high-pressure liquid fills the liquid seal chamber 430 to achieve a seal, making the overall structure more compact.

[0039] like Figures 3 and 4In some embodiments, the liquid sealing mechanism 400 further includes a second sealing mechanism 440. To further enhance the sealing effect and reduce the leakage of compressed gas, the second sealing mechanism 440 can be provided between the screw 200 and the housing 100. The second sealing mechanism 440 serves as an auxiliary mechanism to further enhance the sealing effect. Preferably, in some embodiments, the second sealing mechanism 440 is a labyrinth seal structure provided on both sides of the annular groove 410. The labyrinth seal structure comprises a plurality of annular sealing teeth arranged in sequence on both sides of the annular groove 410. A series of intercepting gaps and expansion cavities are formed between the teeth. When the liquid passes through the gaps in the tortuous labyrinth, a throttling effect is generated, thereby achieving the purpose of preventing leakage. After filling the liquid seal cavity 430, the high-pressure liquid will escape into the gap between the screw 200 and the housing 100. The labyrinth seals provided on both sides of the annular groove 410 can attenuate the pressure, blocking the high-pressure liquid in the gap between the screw 200 and the housing 100. This enhances the sealing effect between the screw 200 and the housing 100 and reduces leakage of compressed gas. Preferably, the second sealing mechanism 440 can also be a threaded groove provided on both sides of the annular groove 410, which can also attenuate the pressure of the high-pressure liquid and enhance the sealing performance between the screw 200 and the housing 100.

[0040] like Figures 1 to 2 As shown, in some embodiments, the first liquid spraying port 130 is tilted and arranged on the housing 100. The liquid sprayed from the first liquid spraying port 130 is used to seal the high pressure area of ​​the housing 100. Figure 1 As shown, the first liquid spray port 130 is tilted and oriented toward the low-pressure area of ​​the housing 100. The liquid supply device sprays liquid with a certain pressure into the first liquid spray port 130. The movement direction of the liquid sprayed from the first liquid spray port 130 is consistent with the rotation direction of the screw 200. The liquid sprayed from the tilted first liquid spray port 130 can drive the screw 200 to rotate, thereby achieving the purpose of reducing power consumption.

[0041] like Figures 1 to 2 As shown, in some embodiments, two first liquid spray ports 130 are provided, and the two first liquid spray ports 130 are symmetrically distributed with respect to the central symmetry axis of the screw 200. The two oppositely disposed first liquid spray ports 130 are both inclined, and the movement direction of the liquid sprayed from the first liquid spray ports 130 is consistent with the rotation direction of the screw 200. The liquid sprayed from the two inclined first liquid spray ports 130 can both drive the screw 200 to rotate, which is more effective than traditional vertical liquid spray ports in driving the screw 200 to rotate, and the power consumption is more significantly reduced.

[0042] like Figure 5As shown, in some embodiments, a sealing surface abutting against the star wheel 300 is provided on the shell 100, and the area of ​​the sealing surface gradually increases along the direction in which the gas is compressed. The star wheel 300 and the shell 100 rotate relative to each other, and the seal between the star wheel 300 and the shell 100 relies on the sealing surface abutting against the star wheel 300 provided on the shell 100. Since the high-pressure area of ​​the shell 100 is filled with compressed gas, the gas leakage will be more serious than the low-pressure area of ​​the shell 100. Therefore, the sealing effect between the shell 100 and the star wheel 300 in the high-pressure area of ​​the shell 100 should be better than the sealing effect between the shell 100 and the star wheel 300 in the low-pressure area of ​​the shell 100. As shown in FIG. Figure 5 The area of ​​the sealing surface 140 in the low-pressure area of ​​the housing 100 is smaller than the area of ​​the sealing surface 150 in the high-pressure area of ​​the housing 100. By increasing the sealing surface area in the high-pressure area of ​​the housing 100, the leakage of compressed gas between the star wheel 300 and the housing 100 can be effectively reduced.

[0043] like Figures 1 to 6 As shown, a single-screw compressor includes any of the above-mentioned single-screw compressor sealing systems. In some embodiments, preferably, the liquid used in the sealing system of the single-screw compressor is oil, and the single-screw compressor is an oil-injected single-screw compressor. Preferably, the oil-injected single-screw compressor also includes an oil-gas separator, and the liquid supply device is connected to the first liquid spray port 130 to connect the pressurized oil, and the second liquid spray port 420 to connect the high-pressure oil. The sealing system of the single-screw compressor adopts oil-liquid sealing, which has a good sealing effect and can achieve the effects of lubrication, cooling and noise reduction. In some embodiments, preferably, the liquid used in the sealing system of the single-screw compressor is water, and the single-screw compressor is a water-injected single-screw compressor. The liquid supply device is connected to the first liquid spray port 130 to connect the pressurized water, and the second liquid spray port 420 to connect the high-pressure water. The sealing system of the single-screw compressor adopts water sealing, which has a good sealing effect and can reduce the viscous shear loss caused by oil injection, with good energy-saving effect and clean and environmentally friendly.

[0044] The technical features of the above embodiments can be combined arbitrarily. To make the description concise, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0045] While embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions, and variations may be made to the embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is defined by the claims and their equivalents.

Claims

1. A single screw compressor, characterized in that: A single-screw compressor sealing system is provided, wherein the single-screw compressor sealing system comprises: a housing (100) provided with a first liquid injection port (130); a screw (200) rotatably disposed on the housing (100); Two star wheels (300) are rotatably arranged on the housing (100), and the two star wheels (300) are respectively arranged on both sides of the screw (200) and meshed with the screw (200); The screw (200), the star wheel (300) and the housing (100) can jointly define a compression chamber (160); a liquid supply device, connected to the compression chamber (160) through the first liquid spray port (130); A liquid sealing mechanism (400) is provided between the screw (200) and the housing (100) for sealing a gap between the screw (200) and the housing (100); The liquid sealing mechanism (400) comprises an annular groove (410) provided on the outer peripheral surface of the screw (200) and a second liquid spraying port (420) provided on the housing (100) and opposite to the annular groove (410); the annular groove (410) and the inner wall of the housing (100) jointly define a liquid sealing cavity (430); the liquid supply device is connected to the liquid sealing cavity (430) through the second liquid spraying port (420), and the liquid supply device is used to spray high-pressure liquid into the liquid sealing cavity (430); the second liquid spraying port (420) is composed of a plurality of cylindrical holes of different diameters, the diameters of the plurality of cylindrical holes decreasing along the radial inward direction of the housing (100), and the diameter of the cylindrical hole of the second liquid spraying port (420) located on the inner wall of the housing (100) is smaller than the width of the annular groove (410); The liquid sealing mechanism (400) further includes a second sealing mechanism (440); the second sealing mechanism (440) is a labyrinth sealing structure provided on both sides of the annular groove (410), wherein the labyrinth sealing structure comprises a plurality of annular sealing teeth arranged in sequence on both sides of the annular groove (410), with a series of interception gaps and expansion cavities formed between the teeth; the first liquid spraying port (130) is obliquely provided on the housing (100); two first liquid spraying ports (130) are provided, and the two first liquid spraying ports (130) are centrally symmetrically distributed relative to the central symmetry axis of the screw (200); a sealing surface abutting against the star wheel (300) is provided on the housing (100), and the area of ​​the sealing surface gradually increases along the direction in which the gas is compressed.

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