CN218624726U

CN218624726U - Two-stage centrifugal air compressor's seal structure

Info

Publication number: CN218624726U
Application number: CN202223021824.6U
Authority: CN
Inventors: 孟婵君; 李旭; 常海兵; 代稀敏; 甘露; 梁为
Original assignee: Cssc Southwest Equipment Research Institute Co ltd
Current assignee: Cssc Southwest Equipment Research Institute Co ltd
Priority date: 2022-11-12
Filing date: 2022-11-12
Publication date: 2023-03-14
Anticipated expiration: 2032-11-12

Abstract

The utility model relates to a sealing structure of a two-stage centrifugal air compressor, which comprises a first-stage centrifugal compressor, a motor and a second-stage centrifugal compressor; the first-stage centrifugal compressor comprises a first-stage impeller and a first-stage volute; the motor comprises a rotor, a stator and a shell; the two-stage centrifugal compressor comprises a two-stage impeller and a two-stage volute; the first-stage volute and the second-stage volute are respectively fixed at two ends of the casing, the stator is installed in the casing, and the first-stage impeller and the second-stage impeller are directly connected with the rotor; radial bearings are respectively arranged at two ends of the rotor, and a thrust bearing is arranged on the side of the first-stage impeller; the two ends of the rotor are respectively provided with a first-stage dynamic seal and a second-stage dynamic seal, the second-stage centrifugal compressor is provided with a second-stage static seal, and the second-stage static seal is arranged on the inner side of the second-stage dynamic seal. The utility model discloses an adopt move, the mode that static seal combined together, guarantee to reveal the loss reduction in the compressor operation process, improve complete machine efficiency.

Description

Two-stage centrifugal air compressor's seal structure

Technical Field

The utility model relates to a hydrogen fuel cell technical field especially relates to a two-stage centrifugal air compressor's seal structure.

Background

The hydrogen fuel cell air compressor is more important for meeting the high efficiency requirement, the efficiency of the compressor impeller is improved, and a reasonable sealing structure is required for ensuring the efficiency of the compressor impeller and reducing leakage.

Disclosure of Invention

To the not enough of above-mentioned prior art, the technical problem that this patent application will be solved provides one kind and can optimize the sealed effect of complete machine, promotes complete machine efficiency, improves system stability, increase of service life's two-stage centrifugal air compressor's seal structure.

In order to solve the technical problem, the utility model discloses a following technical scheme:

a sealing structure of a two-stage centrifugal air compressor comprises a first-stage centrifugal compressor, a motor and a second-stage centrifugal compressor; the first-stage centrifugal compressor comprises a first-stage impeller and a first-stage volute; the motor comprises a rotor, a stator and a shell; the two-stage centrifugal compressor comprises a two-stage impeller and a two-stage volute; the first-stage volute and the second-stage volute are respectively fixed at two ends of the casing, the stator is installed in the casing, and the first-stage impeller and the second-stage impeller are directly connected with the rotor; one-level dynamic seal and second grade dynamic seal are installed respectively to the both ends of rotor, second grade centrifugal compressor side is installed the second grade static seal, the setting of second grade static seal is in second grade dynamic seal's inboard.

Wherein, an air bearing is arranged on the rotor.

Specifically, the air bearing includes one-level journal bearing, second grade journal bearing and thrust bearing, one-level journal bearing and second grade journal bearing are installed respectively to the both ends of rotor, thrust bearing is installed to the one end that the rotor is close to one-level centrifugal compressor.

The first-stage impeller and the second-stage impeller are mounted on the rotor through nuts.

Wherein, a cooling water channel is arranged in the machine shell.

Wherein, the cooling water channel is spirally arranged along the shell.

To sum up, the utility model discloses an adopt the mode that moves, static seal combined together, guarantee that the loss reduction is revealed to the compressor operation in-process, improve complete machine efficiency.

Drawings

Fig. 1 is a schematic structural diagram of a sealing structure of a two-stage centrifugal air compressor according to the present invention.

Detailed Description

The present invention will be described in further detail with reference to the accompanying drawings. In the description of the present invention, it should be understood that the directions or positional relationships indicated by the directional terms such as "upper and lower" and "top and bottom" etc. are generally based on the directions or positional relationships shown in the drawings, and are only for convenience of description and simplification of description, and in the case of not making a reverse description, these directional terms do not indicate and imply that the device or element referred to must have a specific direction or be constructed and operated in a specific direction, and therefore, should not be construed as limiting the scope of the present invention; the terms "inner and outer" refer to the inner and outer relative to the profile of the respective component itself.

As shown in fig. 1, a sealing structure of a two-stage centrifugal air compressor comprises a first-stage centrifugal compressor, a motor and a second-stage centrifugal compressor; the first-stage centrifugal compressor comprises a first-stage impeller 10 and a first-stage volute 9; the motor comprises a rotor 7, a stator 6 and a shell 4; the two-stage centrifugal compressor comprises a two-stage impeller 1 and a two-stage volute 2; the first-stage volute 9 and the second-stage volute 2 are respectively fixed at two ends of the casing 4 and are integrally installed, the stator 6 is installed in the casing 4, the first-stage impeller 10 and the second-stage impeller 1 are directly connected with the rotor 7, and the compression impeller is driven to rotate and pressurize through high-speed rotation of the direct-current motor; one-level dynamic seal 8 and second grade dynamic seal 3 are installed respectively to the both ends of rotor 7, second grade static seal 14 is installed to the second grade compressor side, second grade static seal 14 sets up the inboard at second grade dynamic seal 3.

In this embodiment, an air bearing is mounted on the rotor.

Specifically, air bearing includes one-level journal bearing 12, second grade journal bearing 13 and thrust bearing 11, one-level journal bearing and second grade journal bearing are installed respectively to the both ends of rotor, thrust bearing is installed to the one end that the rotor is close to one-level centrifugal compressor.

In this embodiment, the first-stage impeller and the second-stage impeller are mounted on the rotor through nuts.

In this embodiment, a cooling water channel 5 is provided in the housing.

In this embodiment, the cooling water channel is spirally disposed along the housing.

The principle is as follows:

as shown in fig. 1, after the gas entering from the outside is compressed by the first-stage impeller 10, because a gap exists between the rotor and the fixed part, the high-pressure gas leaks from the back of the impeller, the leakage of the leaked gas after passing through the first-stage dynamic seal 8 is reduced, the leaked gas is increased along with the increase of the rotating speed, and the sealing effect is correspondingly enhanced. The gas after the compression of one-level impeller 10 enters the second-level impeller 1 through the connecting pipeline to continue the compression, so the gas pressure of the side of the second-level impeller 1 is higher than that of the first-level impeller 10, the leakage amount is larger, and the static seal is also arranged on the side of the second level except for the dynamic seal, when the leakage gas leaks from the gap between the rotor and the fixed part, the leakage gas needs to firstly pass through the second-level dynamic seal 3 and then passes through the second-level static seal 14, and the static seal and dynamic seal combined mode ensures that the net leakage amount is reduced, thereby improving the efficiency of the compressor.

Finally, it should be noted that: various modifications and alterations of this invention may be made by those skilled in the art without departing from the spirit and scope of this invention. Thus, to the extent that such modifications and variations of the present invention fall within the scope of the present claims and their equivalents, it is intended that the present invention encompass such modifications and variations as well.

Claims

1. A sealing structure of a two-stage centrifugal air compressor is characterized by comprising a first-stage centrifugal compressor, a motor and a second-stage centrifugal compressor;

the first-stage centrifugal compressor comprises a first-stage impeller and a first-stage volute; the motor comprises a rotor, a stator and a shell; the two-stage centrifugal compressor comprises a two-stage impeller and a two-stage volute;

the first-stage volute and the second-stage volute are respectively fixed at two ends of the shell, the stator is installed in the shell, and the first-stage impeller and the second-stage impeller are directly connected with the rotor; one-level dynamic seal and second grade dynamic seal are installed respectively to the both ends of rotor, second grade centrifugal compressor side is installed the second grade static seal, the setting of second grade static seal is in second grade dynamic seal's inboard.

2. A seal arrangement according to claim 1, in which the rotor has an air bearing mounted thereon.

3. A sealing structure of a two-stage centrifugal air compressor according to claim 2, wherein the air bearing comprises a first-stage radial bearing, a second-stage radial bearing and a thrust bearing, the first-stage radial bearing and the second-stage radial bearing are respectively installed at two ends of the rotor, and the thrust bearing is installed at one end of the rotor close to the first-stage centrifugal compressor.

4. A seal structure of a two-stage centrifugal air compressor according to claim 3, wherein said one-stage impeller and said two-stage impeller are mounted on the rotor by nuts.

5. A seal arrangement for a two stage centrifugal air compressor according to claim 3, wherein a cooling water path is provided in said housing.

6. A seal arrangement according to claim 5, wherein said cooling water channel is arranged helically along the housing.