CN212744461U

CN212744461U - Sealing structure for fuel cell air compressor

Info

Publication number: CN212744461U
Application number: CN202021214962.4U
Authority: CN
Inventors: 靳彩妍; 宿明亮; 吴孟龙; 范俊岩
Original assignee: Isem Technologies (shanghai) Co
Current assignee: Eason Technology (Jiangsu) Co., Ltd
Priority date: 2020-06-28
Filing date: 2020-06-28
Publication date: 2021-03-19
Anticipated expiration: 2030-06-28

Abstract

The utility model relates to a sealing structure for a fuel cell air compressor, wherein two groups of grooves are arranged on the contact surface of a rotating shaft and a pinch roller back plate, and sealing rings are arranged in the grooves; an axial tooth type labyrinth seal structure is arranged between the pinch roller and the pinch roller back plate. During the use, the utility model discloses can be used to the gas seal under the higher pressure differential, raise the efficiency and reduce the energy consumption, the tooth-like labyrinth seal structure design of axial is special simultaneously, increases sealed effect, has reduced the dependency of labyrinth design size to radial bearing clearance in addition.

Description

Sealing structure for fuel cell air compressor

Technical Field

The utility model belongs to the technical field of the technique of air compressor machine and specifically relates to a seal structure for fuel cell air compressor machine.

Background

At present, a centrifugal air compressor of a fuel cell adopts an air bearing, cooling air is generally adopted to cool the air bearing and a rotor part of a motor, the cooling air is input into a rotor cavity at a higher pressure, the sealing design of the cooling air is very critical in the process, the existing design is radial labyrinth seal, as shown in figure 1, the structure of the centrifugal air compressor is composed of two parts, one part is a labyrinth tooth type sealing part integrated with a shell or arranged on the shell, the other part is a section of a rotating shaft, in the rotating process, high-pressure gas enters a tooth form in the labyrinth to be depressurized, and the pressure is reduced to the gas pressure at a low-pressure end until the last tooth, so that the function of preventing the high-pressure gas from leaking is completed.

However, the prior art sealing forms have the following disadvantages:

1. because the prior bearing for the fuel cell centrifugal air compressor adopts an air bearing, the clearance design of the labyrinth seal tooth form and the rotating shaft also needs to consider the clearance design of the prior air bearing, so that the rotor system bears the force on the bearing in a static state, the radial bearing clearance is larger than the sealing structure clearance, the radial clearance of the air bearing is larger, and the radial labyrinth seal is designed to be larger than the air bearing clearance, so that the effect of sealing high-pressure gas leakage can not be achieved.

2. Under the condition that the radial labyrinth seal clearance is designed to be small, the sealing effect can reach the standard, but the sealing effect can participate in the motion of the rotor in the form of a spring, so that the cross rigidity is provided for the rotor system, and the stability of the rotor system is influenced.

3. In order to achieve a certain sealing effect, the number of the tooth forms needs to be increased, so that the axial lengthening of the rotor is caused, and the design of rotor dynamics is not facilitated.

Disclosure of Invention

An object of the utility model is to provide an improve fuel cell air compressor machine's seal structure through having set up and adopting double containment ring structure and pinch roller backplate labyrinth seal design, can be used to the gas seal under the higher pressure differential, raises the efficiency and reduces the energy consumption.

In order to realize the purpose, the technical scheme of the utility model is that: the utility model provides a seal structure for fuel cell air compressor machine, establish in the pivot pinch roller and with pinch roller matched with pinch roller backplate including pivot and cover, its characterized in that: two groups of grooves are arranged on the contact surface of the rotating shaft and the pinch roller back plate, and sealing rings are arranged in the grooves; an axial tooth type labyrinth seal structure is arranged between the pinch roller and the pinch roller back plate.

Furthermore, the axial tooth type labyrinth seal structure is composed of a plurality of circles of concentric circles formed by arranging seal teeth, staggered tooth structures of at least more than 5 circles of concentric circles are uniformly distributed on the contact surface of the pinch roller and the pinch roller back plate, and the staggered tooth structures refer to the staggered arrangement of each seal tooth of adjacent concentric circles.

Furthermore, the sealing teeth are straight teeth or helical teeth, the end parts of the straight teeth are in an arc shape, and the inclination angle of the helical teeth is 15-30 degrees.

Further, the spacing between adjacent concentric circles is equal. Or the distance between adjacent concentric circles is sequentially enlarged from the center of the circle to the outside.

Compared with the prior art, the technical scheme of the utility model except whole technical scheme's improvement, still include the improvement in the aspect of many details, particularly, have following beneficial effect:

1. in the improved scheme of the utility model, two groups of grooves are arranged on the contact surface of the rotating shaft and the pinch roller back plate, and sealing rings are arranged in the grooves; an axial tooth type labyrinth seal structure is arranged between the pressing wheel and the pressing wheel back plate, so that the axial tooth type labyrinth seal structure can be used for gas sealing under higher pressure difference, the efficiency is improved, and the energy consumption is reduced;

2. in the technical scheme of the utility model, the double-sealing ring structure is adopted, and under the condition of effectively preventing high-pressure gas from leaking, the axial length of the clearance rotating part is more beneficial to the stability design of the rotor system;

3. in the scheme of the utility model, the axial labyrinth seal design between the pinch roller and the pinch roller back plate is adopted, the labyrinth design area is large, the structure is special, the sealing effect is increased, and in addition, the dependency of the labyrinth design size on the radial bearing clearance is reduced;

4. the utility model has the advantages of simple structure, easy to implement, the cost is lower, facilitate promotion and utilization.

Drawings

Fig. 1 is a schematic structural diagram of the prior art.

Fig. 2 is a schematic structural diagram of the present invention.

Fig. 3 is a partially enlarged schematic view of the present invention.

Reference numerals:

1, a rotating shaft, 2 press wheels and 3 press wheel back plates;

11 grooves and 12 sealing rings;

21 axial tooth type labyrinth sealing structure, 22 sealing tooth.

Detailed Description

The technical solution of the present invention will be described clearly and completely with reference to the accompanying drawings, and obviously, the described embodiments are some, but not all embodiments of the present invention. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.

The utility model provides a seal structure for fuel cell air compressor machine, specifically refer to FIG. 3, establish in changeing epaxial pinch roller 2 and with pinch roller matched with pinch roller backplate 3 including pivot 1 and cover, its difference with prior art lies in: two groups of grooves 11 are arranged on the contact surface of the rotating shaft and the pinch roller back plate, sealing rings 12 are arranged in the grooves to form a double-sealing ring structure, and an axial tooth type labyrinth sealing structure 21 is arranged between the pinch roller and the pinch roller back plate.

Under the condition of effectively preventing high-pressure gas from leaking, the axial length of the clearance rotating part is more beneficial to the stability design of the rotor system. Meanwhile, the axial labyrinth seal design between the pinch roller and the pinch roller back plate is adopted, the labyrinth design area is large, the sealing effect is improved, and the dependency of the labyrinth design size on the radial bearing clearance is reduced.

In the embodiment, two groups of grooves are arranged on the contact surface of the rotating shaft and the pinch roller back plate, sealing rings are arranged in the grooves to form a double-sealing ring structure, the two sealing rings can be thick and thin in the same diameter or thick and thin, the diameter and the width of the sealing ring close to the pinch roller back plate are smaller than those of the sealing ring far away from the pinch roller back plate, and the cost is reduced.

Specifically, an axial tooth type labyrinth seal structure is arranged between the pressing wheel and the pressing wheel back plate, the axial tooth type labyrinth seal structure is formed by concentric circles formed by arranging a plurality of circles of seal teeth, staggered tooth structures (preferably 6-8 circles) of at least more than 5 circles of concentric circles are uniformly distributed on the contact surface of the pressing wheel and the pressing wheel back plate, and the staggered tooth structures refer to the staggered arrangement of each seal tooth of adjacent concentric circles, so that the seal effect is improved.

Further, the sealing teeth 22 are straight teeth or helical teeth, the end portions of the straight teeth are arc-shaped, the inclination angle of the helical teeth is 15-30 degrees, the preferred angle is 18 degrees, and therefore oblique insertion and installation are facilitated.

Furthermore, the height of the straight teeth of each circle can be different, the closer to the axis of the rotating shaft, the smaller the height of the straight teeth, the better the sealing effect, even if the straight teeth of the inner circle are worn, the stronger the sealing effect of the outer circle, and the ratio of the heights of the straight teeth of the adjacent inner circle and the outer circle is 0.95: 1.

In this embodiment, the distance between adjacent concentric circles may be equal, or the distance between adjacent concentric circles may be sequentially enlarged from the center of the circle from inside to outside, and then the straight teeth with different heights are matched, so that the sealing effect is more prominent.

The foregoing is a more detailed description of the invention, taken in conjunction with the accompanying preferred embodiments, and it is not intended that the invention be limited to the specific embodiments described above. To the utility model belongs to the technical field of ordinary technical personnel, do not deviate from the utility model discloses under the prerequisite of design, can also make a plurality of simple deductions or replacement, all should regard as belonging to the utility model discloses a protection scope.

Claims

1. The utility model provides a seal structure for fuel cell air compressor machine, establish in the pivot pinch roller and with pinch roller matched with pinch roller backplate including pivot and cover, its characterized in that: two groups of grooves are arranged on the contact surface of the rotating shaft and the pinch roller back plate, and sealing rings are arranged in the grooves; an axial tooth type labyrinth seal structure is arranged between the pinch roller and the pinch roller back plate.

2. A sealing structure for a fuel cell air compressor according to claim 1, characterized in that: the axial tooth type labyrinth seal structure is composed of a plurality of circles of concentric circles formed by arranging seal teeth, staggered tooth structures of at least more than 5 circles of concentric circles are uniformly distributed on the contact surface of the pinch roller and the pinch roller back plate, and the staggered tooth structures refer to the staggered arrangement of each seal tooth of adjacent concentric circles.

3. A sealing structure for a fuel cell air compressor according to claim 2, characterized in that: the sealing teeth are straight teeth or helical teeth, the end parts of the straight teeth are in an arc shape, and the inclination angle of the helical teeth is 15-30 degrees.

4. A sealing structure for a fuel cell air compressor according to claim 2, characterized in that: the adjacent concentric circles are equally spaced.

5. A sealing structure for a fuel cell air compressor according to claim 2, characterized in that: the distance between adjacent concentric circles is sequentially enlarged from the center of the circle to the outside.