Screw compressor with negative pressure sealing structure

Abstract

The utility model belongs to the technical field of screw compressors, and particularly relates to a screw compressor with a negative pressure sealing structure, which comprises an air inlet end cover, an air inlet end bearing seat is arranged on the side wall of the air inlet end cover, an air inlet shell is arranged on the side wall of the air inlet end bearing seat, an air outlet end bearing seat is arranged on the side wall of the air inlet shell, and an air outlet end bearing seat is arranged on the side wall of the air outlet shell. A female rotor end cover and a male rotor end cover are arranged on the side wall of the exhaust end bearing seat, the air inlet end cover and the air inlet end bearing seat are arranged between the air inlet end cover and the air inlet end bearing seat, and the air inlet end bearing seat and the air inlet shell are arranged between the air inlet end cover and the air inlet end bearing seat. The built-in ring with the lip is arranged in the O-shaped ring, and a plurality of groups of sealing strips and clamping strips are also arranged in the inner ring of the O-shaped ring, so that external air can be effectively prevented from entering a negative pressure area in a main machine, the influence on the purity of compressed gas is reduced, and the long-term operation reliability of the compressor is further improved.

Description

Technical Field

[0001] The utility model relates to the technical field of screw compressors, in particular to a screw compressor with a negative pressure sealing structure. Background Art

[0002] Screw compressors are categorized as single-screw and twin-screw. Screw compressors consist of a pair of parallel, intermeshing male and female screws. Twin-screw compressors are commonly referred to. Screw compressors can be either dry or wet. Dry screw compressors eliminate liquid contamination in the working chamber, while wet screw compressors inject lubricating oil or other liquids into the working chamber to cool the compressed gas, improve sealing, and lubricate the male and female rotors and bearings for self-propagation. High-precision filters then remove oil and other liquid impurities from the compressed air, resulting in higher-quality compressed gas.

[0003] The screw compressor has the characteristics of small size, light weight and easy maintenance, which improves the processing accuracy and efficiency of this pair of key parts, and effectively improves the performance of the screw compressor.

[0004] The sealing form of existing screw compressors is a single O-ring or gasket seal. The disadvantage is that during the operation of the main unit, external air may enter the negative pressure area inside the main unit through the O-ring or gasket, thereby affecting the purity of the compressed gas inside the main unit, resulting in the need for complex purification equipment in the future. Utility Model Content

[0005] The purpose of the present utility model is to provide a screw compressor with a negative pressure sealing structure to solve the problem that the sealing form of the existing screw compressor proposed in the above background technology is a single O-ring or gasket seal, which has the disadvantage that during the operation of the main unit, the outside air may pass through the O-ring or gasket into the negative pressure area inside the main unit, thereby affecting the purity of the compressed gas inside the main unit, resulting in the need for a complex purification device in the future.

[0006] To achieve the above-mentioned object, the present invention provides the following technical solution: comprising an intake end cover, the side wall of the intake end cover is provided with an intake end bearing seat, the side wall of the intake end bearing seat is provided with an intake housing, the side wall of the intake housing is provided with an exhaust end bearing seat, and the side wall of the exhaust end bearing seat is provided with a female rotor end cover and a male rotor end cover;

[0007] in:

[0008] The air intake end cover, O-rings are provided between the air intake end cover and the air intake end bearing seat, between the air intake end bearing seat and the air intake housing, and between the air intake housing and the exhaust end bearing seat.

[0009] Preferably, the inner wall of the O-ring is integrally formed with a groove, and the inner wall of the groove is inlaid with a built-in ring.

[0010] Preferably, both ends of the built-in ring are integrally formed with lips.

[0011] Preferably, an inner ring of the O-ring is sleeved on the top of the O-ring, and a combination hole and an inner ring are reserved on the side wall of the inner ring of the O-ring.

[0012] Preferably, the side wall of the inner ring is integrally connected with a sealing strip 1, and the side wall of the sealing strip 1 is provided with a clamping strip 1.

[0013] Preferably, the side wall of the first clamping strip is provided with a second sealing strip, and the side wall of the second sealing strip is provided with a second clamping strip.

[0014] Preferably, the side wall of the second clamping strip is provided with a third sealing strip, and the side wall of the third sealing strip is provided with a third clamping strip.

[0015] Compared with the prior art, the beneficial effects of the present invention are:

[0016] This type of screw compressor with a negative pressure sealing structure uses an O-ring seal through the combined use of accessories. The O-ring has a built-in ring with a lip, and the inner ring of the O-ring also has multiple sets of sealing strips and clamping strips, which can effectively prevent outside air from entering the negative pressure area inside the main unit, reduce the impact on the purity of the compressed gas, and thus improve the long-term operation reliability of the compressor. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the present invention will be described in detail below in conjunction with the accompanying drawings and detailed embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without inventive labor. Among them:

[0018] Figure 1 This is a schematic diagram of the overall structure of the utility model;

[0019] Figure 2 This is a side view of the O-ring of the utility model;

[0020] Figure 3 This is a detailed schematic diagram of the inner ring of the O-ring of the utility model;

[0021] Figure 4 This is a schematic diagram of the utility model in which a single O-ring is sealed with positive pressure gas;

[0022] Figure 5 This is a schematic diagram of the double O-ring sealing state with positive pressure gas of the utility model.

[0023] In the figure: 1. Inlet end cover; 2. Inlet end bearing seat; 3. Inlet housing; 4. Exhaust end bearing seat; 5. Female rotor end cover; 6. Male rotor end cover; 7. O-ring; 71. Groove; 72. Built-in ring; 73. Lip; 8. Inner ring of O-ring; 81. Combination hole; 82. Inner ring; 821. Sealing strip 1; 822. Clamp strip 1; 823. Sealing strip 2; 824. Clamp strip 2; 825. Sealing strip 3; 826. Clamp strip 3. DETAILED DESCRIPTION

[0024] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like to indicate orientations or positional relationships 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 should not be understood as a limitation on the present invention.

[0025] In the description of the present invention, “plurality” means two or more, unless otherwise clearly defined.

[0026] In the description of this utility model, it should be noted that, unless otherwise expressly specified or limited, the terms "installed," "provided with," "mounted / connected," and "connected" should be understood in a broad sense. For example, "connected" can mean a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, or it can be internal communication between two components. For those skilled in the art, the specific meanings of the above terms in this utility model can be understood according to the specific circumstances.

[0027] This utility model provides a screw compressor with a negative pressure sealing structure. It adopts O-ring sealing. The O-ring has a built-in ring with a lip. In addition, there are multiple sets of sealing strips and clamping strips in the inner ring of the O-ring. These can effectively prevent outside air from entering the negative pressure area inside the main unit, reduce the impact on the purity of the compressed gas, and thus improve the long-term operating reliability of the compressor. Figures 1 to 5 , including an air intake end cover 1, the side wall of the air intake end cover 1 is provided with an air intake end bearing seat 2, the side wall of the air intake end bearing seat 2 is provided with an air intake shell 3, the side wall of the air intake shell 3 is provided with an exhaust end bearing seat 4, and the side wall of the exhaust end bearing seat 4 is provided with a female rotor end cover 5 and a male rotor end cover 6;

[0028] O-rings 7 are provided on the air intake cover 1, between the air intake cover 1 and the air intake bearing seat 2, between the air intake bearing seat 2 and the air intake housing 3, and between the air intake housing 3 and the exhaust bearing seat 4;

[0029] In specific use, first, an O-ring inner ring 8 is set on the O-ring 7, and a sealing strip 1 821 is set in the O-ring inner ring 8, the side wall of the sealing strip 1 821 is provided with a clamping strip 1 822, the side wall of the clamping strip 1 822 is provided with a sealing strip 2 823, the side wall of the sealing strip 2 823 is provided with a clamping strip 2 824, the side wall of the clamping strip 2 824 is provided with a sealing strip 3 825, and the side wall of the sealing strip 3 825 is provided with a clamping strip 3 826. The overlapping layer method is convenient for ensuring the sealing performance. Taking scheme 1 as an example, O-rings 7 are provided between the air intake cover 1 and the air intake end bearing seat 2, between the air intake end bearing seat 2 and the air intake shell 3, and between the air intake shell 3 and the exhaust end bearing seat 4. Positive pressure gas (compressed gas) is introduced from the outside into the O-ring groove close to the compressed gas side for protection, and sealing glue or indium wire is applied to the III area for sealing. See specifically Figure 4 Taking the second scheme as an example, two O-rings 7 are provided between the intake cover 1 and the intake bearing seat 2, between the intake bearing seat 2 and the intake housing 3, and between the intake housing 3 and the exhaust bearing seat 4. A V-shaped groove is dug between the two O-rings 7 to introduce positive pressure gas (compressed gas) from the outside into the V-shaped groove for protection. Figure 5 ;

[0030] Secondly, in order to ensure the combined effect of the built-in ring 72 and the O-ring 7 , specifically, the inner wall of the O-ring 7 is integrally formed with a groove 71 , and the inner wall of the groove 71 is inlaid with the built-in ring 72 .

[0031] At the same time, in order to ensure the sealing effect, specifically, both ends of the built-in ring 72 are integrally formed with lips 73 .

[0032] Furthermore, in order to facilitate mutual combination and normal use, specifically, the top of the O-ring 7 is sleeved with an O-ring inner ring 8, and the side wall of the O-ring inner ring 8 is reserved with a combination hole 81 and an inner ring 82.

[0033] Subsequently, in order to ensure the sealing performance of the inner ring 82 itself, specifically, the side wall of the inner ring 82 is integrally formed with a sealing strip 821 , and the side wall of the sealing strip 821 is provided with a clamping strip 822 .

[0034] At the same time, in order to further improve the sealing effect, specifically, the side wall of the first clamping strip 822 is provided with a second sealing strip 823, the side wall of the second sealing strip 823 is provided with a second clamping strip 824, the side wall of the second clamping strip 824 is provided with a third sealing strip 825, and the side wall of the third sealing strip 825 is provided with a third clamping strip 826;

[0035] The material of the multiple sets of sealing strips and clamping strips is the same as that of the O-ring inner ring 8, and the multiple sets are arranged to increase the overlapping effect to ensure the sealing.

[0036] In addition, the conventional accessories and conventional structures involved in the present invention are all existing technologies and can be fully implemented by those skilled in the art. Needless to say, the content protected by the present invention does not involve improvements to internal structures and methods.

[0037] While the present invention has been described above with reference to exemplary embodiments, various modifications may be made and equivalent components may be substituted without departing from the scope of the present invention. In particular, as long as no structural conflicts exist, the various features of the disclosed embodiments may be combined with one another in any manner. The omission of an exhaustive description of these combinations in this specification is solely for the sake of space and resource conservation. Therefore, the present invention is not limited to the specific embodiments disclosed herein, but encompasses all technical solutions within the scope of the claims.

Claims

1. A screw compressor with a negative pressure sealing structure, characterized in that: The invention comprises an air intake end cover (1), a side wall of the air intake end cover (1) is provided with an air intake end bearing seat (2), a side wall of the air intake end bearing seat (2) is provided with an air intake shell (3), a side wall of the air intake shell (3) is provided with an exhaust end bearing seat (4), and a side wall of the exhaust end bearing seat (4) is provided with a female rotor end cover (5) and a male rotor end cover (6); in: An air intake end cover (1), an O-ring (7) is provided between the air intake end cover (1) and the air intake end bearing seat (2), between the air intake end bearing seat (2) and the air intake housing (3), and between the air intake housing (3) and the exhaust end bearing seat (4).

2. The screw compressor with a negative pressure sealing structure according to claim 1, characterized in that: The inner wall of the O-ring (7) is integrally formed with a groove (71), and the inner wall of the groove (71) is inlaid with a built-in ring (72).

3. The screw compressor with a negative pressure sealing structure according to claim 2, characterized in that: Both ends of the built-in ring (72) are integrally formed and connected with lips (73).

4. The screw compressor with a negative pressure sealing structure according to claim 3, characterized in that: The top of the O-ring (7) is sleeved with an O-ring inner ring (8), and the side wall of the O-ring inner ring (8) is reserved with a combination hole (81) and an inner ring (82).

5. The screw compressor with a negative pressure sealing structure according to claim 4, characterized in that: The side wall of the inner ring (82) is integrally formed and connected with a sealing strip (821), and the side wall of the sealing strip (821) is provided with a clamping strip (822).

6. The screw compressor with a negative pressure sealing structure according to claim 5, characterized in that: The side wall of the first clamping strip (822) is provided with a second sealing strip (823), and the side wall of the second sealing strip (823) is provided with a second clamping strip (824).

7. The screw compressor with a negative pressure sealing structure according to claim 6, characterized in that: The side wall of the second clamping strip (824) is provided with a sealing strip three (825), and the side wall of the third sealing strip (825) is provided with a clamping strip three (826).

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