Double-rotor sealing structure of roots type steam compressor

Abstract

The utility model discloses a double-rotor sealing structure of a Roots type steam compressor, and particularly relates to the Roots type steam compressor, which comprises a casing and a rotor shaft lever, and an extension shaft lever arranged at the end part of the rotor shaft lever extends out from the end surface of the casing to a boring hole formed inside; a bottom ring, a first moving ring and a second moving ring which are sequentially distributed are inserted into the bore hole, a first equidistant spring is inserted between the first moving ring and the bottom ring, and a second equidistant spring is inserted between the first moving ring and the second moving ring; a flange connecting pipe is fixedly installed on the end face of the machine shell, and a static ring which extends into the boring hole and is connected with the second movable ring in an abutting mode is inserted into the flange connecting pipe. And a sealing cover for pressing and fixing the static ring is fixedly mounted on the flange connecting pipe. The oil seal piece is simple in structure and convenient and fast to assemble, and the sealing effect of the oil seal piece is guaranteed through the multi-stage sealing design.

Description

TECHNICAL FIELD

[0001] The utility model relates to a roots type steam compressor, concretely relates to a double-rotor sealing structure of roots type steam compressor. BACKGROUND

[0002] The double-rotor sealing structure is the oil seal of the output shaft. It can refer to the following:

[0003] Chinese public patent, public number CN117028245A, discloses a double helix rotor pump sealing structure.

[0004] Chinese authorized patent, public number CN109578087B, discloses a brush seal structure suitable for bidirectional rotation of rotor.

[0005] In the prior art including the above-mentioned patent, the purpose of the oil seal is to prevent dust from entering the interior from the rotor. How to further optimize the design of the oil seal is expected to be well solved. UTILITY MODEL CONTENT

[0006] The utility model aims at providing a double-rotor sealing structure of roots type steam compressor,

[0007] In order to achieve the above-mentioned purpose, the utility model provides the following technical scheme:

[0008] A double-rotor sealing structure of roots type steam compressor, comprising a shell and a rotor shaft, an extension shaft arranged at the end of the rotor shaft extends out of a borehole opened in the end face of the shell towards the interior;

[0009] A bottom ring, a first movable ring and a second movable ring are sequentially arranged in the borehole, a first equidistant spring is arranged between the first movable ring and the bottom ring, and a second equidistant spring is arranged between the first movable ring and the second movable ring;

[0010] A flange connector is fixedly installed on the end face of the shell, a static ring is inserted into the flange connector and connected with the second movable ring,

[0011] A cover is fixedly installed on the flange connector to press the static ring.

[0012] Preferably, the pitch of the second equidistant spring is twice the pitch of the first equidistant spring.

[0013] Preferably, a first ring groove is opened on the end face of the rotor shaft, and a first rubber ring is inlaid in the first ring groove and in contact with the inner wall of the shell.

[0014] As preferred, the bottom ring is in contact with the bottom of the bore hole, and the inner wall of the side of the extension shaft is provided with a groove for embedding the second rubber ring body and the third rubber ring body;

[0015] The cross section of the second rubber ring body is a hollow rectangular structure.

[0016] The number of the third rubber ring body is two, which is close to the first dynamic ring, and the cross section is circular.

[0017] As preferred, the first dynamic ring is provided with a groove for embedding the fourth rubber ring body on the inner wall of the side of the extension shaft, and the cross section of the fourth rubber ring body is a hollow rectangular structure.

[0018] As preferred, the second dynamic ring is provided with a groove for embedding the fifth rubber ring body on the inner wall of the side of the extension shaft, and the number of the fifth rubber ring body is two, and the cross section is circular.

[0019] As preferred, the contact surface of the static ring and the second dynamic ring is provided with a sixth rubber ring body, and the cross section of the sixth rubber ring body is rectangular.

[0020] As preferred, the static ring is provided with a groove for embedding the seventh rubber ring body on the inner wall of the side of the extension shaft, and the number of the seventh rubber ring body is two, and the cross section is circular.

[0021] As preferred, the static ring is provided with a groove for embedding the eighth rubber ring body on the inner wall of the side of the flange connector, and the cross section of the eighth rubber ring body is circular.

[0022] In the above technical solution, the double-rotor sealing structure of the Roots type steam compressor has the following beneficial effects: the contact between the extension shaft and the inner wall of the shell is provided with a first rubber ring, then a multi-stage sealing structure is formed by the bottom ring, the first dynamic ring and the second dynamic ring, so as to optimize the sealing effect, and finally the static ring is used to press and fix the second dynamic ring, so as to optimize the sealing effect again. BRIEF DESCRIPTION OF DRAWINGS

[0023] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the drawings needed in the embodiments will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can also be obtained by those skilled in the art according to these drawings.

[0024] Figure 1 The cross section structure diagram of the rotor shaft and the shell is provided for the embodiments of the present application.

[0025] Figure 2Provided for the embodiments of this utility model Figure 1 A schematic diagram of the rubber ring distribution structure;

[0026] Figure 3 Provided for the embodiments of this utility model Figure 1 A schematic diagram of the bottom ring, the first moving ring, the second moving ring, and the stationary ring.

[0027] Explanation of reference numerals in the attached figures:

[0028] 1. Housing; 11. Boring hole; 12. Flange connector; 2. Rotor shaft; 21. Extension shaft; 22. First rubber ring; 3. Bottom ring; 31. Second rubber ring; 32. Third rubber ring; 4. First moving ring; 41. Fourth rubber ring; 5. Second moving ring; 51. Fifth rubber ring; 6. Stationary ring; 61. Sixth rubber ring; 62. Seventh rubber ring; 63. Eighth rubber ring; 7. Cover; 100. First equidistant spring; 101. Second equidistant spring. Detailed Implementation

[0029] To enable those skilled in the art to better understand the technical solution of this utility model, the present utility model will be further described in detail below with reference to the accompanying drawings.

[0030] like Figures 1-3 As shown, a dual-rotor sealing structure for a Roots-type steam compressor includes a housing 1 and a rotor shaft 2. An extension shaft 21 provided at the end of the rotor shaft 2 extends from the end face of the housing 1 toward an internally opened bore 11.

[0031] A bottom ring 3, a first moving ring 4, and a second moving ring 5 are sequentially inserted into the boring hole 11. A first equidistant spring 100 is inserted between the first moving ring 4 and the bottom ring 3, and a second equidistant spring 101 is inserted between the first moving ring 4 and the second moving ring 5. The pitch of the second equidistant spring 101 is twice the pitch of the first equidistant spring 100.

[0032] A flange connector 12 is fixedly installed on the end face of the housing 1. A stationary ring 6 is inserted into the flange connector 12, extending into the boring hole 11 and abutting against the second moving ring 5.

[0033] A cover 7, which is fixedly installed on the flange connector 12 by bolts and is used to press the stationary ring 6, is also fixedly installed on it.

[0034] The first-stage seal includes: a first annular groove is provided on the end face of the rotor shaft 2, and a first rubber ring 22 that contacts the inner wall of the housing 1 is embedded in the first annular groove.

[0035] The second-stage seal consists of a bottom ring 3, a first rotating ring 4, and a second rotating ring 5, detailed as follows:

[0036] The bottom ring 3 abuts against the bottom of the boring hole 11, and the inner wall facing the extension shaft 21 has a groove for embedding the second rubber ring 31 and the third rubber ring 32. The cross-section of the second rubber ring 31 is a hollow rectangular structure, and there are two third rubber rings 32, which are distributed close to the first moving ring 4 and have a circular cross-section.

[0037] The inner wall of the first moving ring 4 facing the extension shaft 21 has a groove for embedding the fourth rubber ring 41, and the cross section of the fourth rubber ring 41 is a hollow rectangular structure.

[0038] The inner wall of the second moving ring 5 facing the extension shaft 21 has a groove for embedding the fifth rubber ring 51. There are two fifth rubber rings 51, and their cross-sections are circular.

[0039] The third-stage seal is designed with a stationary ring of 6mm. Details are as follows:

[0040] The contact surface between the stationary ring 6 and the second moving ring 5 is provided with an embedded sixth rubber ring 61, the cross-section of which is rectangular.

[0041] Furthermore, the inner wall of the stationary ring 6 facing the extension shaft 21 has a groove for embedding the seventh rubber ring 62. There are two seventh rubber rings 62, and their cross-sections are circular.

[0042] The inner wall of the stationary ring 6 facing the flange connector 12 has a groove for embedding the eighth rubber ring 63, which has a circular cross-section.

[0043] The bottom ring 3, the first moving ring 4, the second moving ring 5, and the stationary ring mentioned above are metal parts. The multiple rubber rings mentioned above are rubber parts.

[0044] In the above technology, a first rubber ring 22 is provided for the contact between the extension shaft 21 and the inner wall of the housing 1. Then, a multi-stage sealing structure is formed by the bottom ring 3, the first moving ring 4 and the second moving ring 5 to optimize the sealing effect. Finally, the stationary ring 6 presses the second moving ring 5 to further optimize the sealing effect.

[0045] The foregoing description only illustrates certain exemplary embodiments of the present invention. Undoubtedly, those skilled in the art can modify the described embodiments in various ways without departing from the spirit and scope of the present invention. Therefore, the above drawings and descriptions are illustrative in nature and should not be construed as limiting the scope of protection of the claims of the present invention.

Claims

1. A dual-rotor sealing structure for a Roots-type steam compressor, comprising a housing (1) and a rotor shaft (2), characterized in that, The extension shaft (21) provided at the end of the rotor shaft (2) extends out from the end face of the housing (1) toward the bore (11) opened inward; A bottom ring (3), a first moving ring (4), and a second moving ring (5) are sequentially inserted into the boring hole (11), and a first equidistant spring (100) is inserted between the first moving ring (4) and the bottom ring (3), and a second equidistant spring (101) is inserted between the first moving ring (4) and the second moving ring (5). A flange connector (12) is fixedly installed on the end face of the housing (1), and a stationary ring (6) extending into the boring hole (11) and abutting against the second moving ring (5) is inserted into the flange connector (12); A cover (7) for pressing the stationary ring (6) is fixedly installed on the flange connector (12).

2. The dual-rotor sealing structure of the Roots-type steam compressor according to claim 1, characterized in that, The pitch of the second equidistant spring (101) is twice the pitch of the first equidistant spring (100).

3. The dual-rotor sealing structure of the Roots-type steam compressor according to claim 1, characterized in that, A first annular groove is provided on the end face of the rotor shaft (2), and a first rubber ring (22) that contacts the inner wall of the housing (1) is embedded in the first annular groove.

4. The dual-rotor sealing structure of the Roots-type steam compressor according to claim 1, characterized in that, The bottom ring (3) abuts against the bottom of the boring hole (11), and the inner wall facing the extension shaft (21) is provided with a groove for embedding the second rubber ring (31) and the third rubber ring (32); The cross-section of the second rubber ring (31) is a hollow rectangular structure; There are two third rubber rings (32), which are distributed close to the first moving ring (4) and have a circular cross-section.

5. The dual-rotor sealing structure of the Roots-type steam compressor according to claim 1, characterized in that, The inner wall of the first moving ring (4) facing the extension shaft (21) has a groove for embedding the fourth rubber ring (41), and the cross section of the fourth rubber ring (41) is a hollow rectangular structure.

6. The dual-rotor sealing structure of the Roots-type steam compressor according to claim 1, characterized in that, The second moving ring (5) has a groove on the inner wall facing the extension shaft (21) for embedding the fifth rubber ring (51). There are two fifth rubber rings (51), and their cross-sections are circular.

7. The dual-rotor sealing structure of the Roots-type steam compressor according to claim 1, characterized in that, The contact surface between the stationary ring (6) and the second moving ring (5) is provided with an embedded sixth rubber ring (61), the cross-section of which is rectangular.

8. The dual-rotor sealing structure of the Roots-type steam compressor according to claim 1, characterized in that, The inner wall of the stationary ring (6) facing the extension shaft (21) has a groove for embedding the seventh rubber ring (62). There are two seventh rubber rings (62), and their cross-sections are circular.

9. The dual-rotor sealing structure of the Roots-type steam compressor according to claim 1, characterized in that, The inner wall of the stationary ring (6) facing the flange connector (12) has a groove for embedding the eighth rubber ring (63), the eighth rubber ring (63) having a circular cross-section.

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