CN115524053A - Gas foil radial bearing for directly detecting gas film pressure - Google Patents

Abstract

The invention discloses a gas foil radial bearing which directly detects gas film pressure. Based on the information that the piezoelectric film sensor is subjected to the change of gas pressure to reflect the gas film pressure in the gas foil radial bearing, the piezoelectric film sensor is embedded in the top foil of the gas foil bearing to realize the air pressure of the gas foil radial bearing. The film pressure is directly detected, and at the same time, a layer of protective material is applied on the piezoelectric film sensor to reduce the dry friction damage between the rotor and the piezoelectric film sensor of the gas foil bearing before take-off. The method of embedding a piezoelectric film sensor in the gas foil radial bearing directly detects the gas film pressure without changing the bearing structure.

Description

A Gas Foil Radial Bearing Directly Detecting Gas Film Pressure

technical field

The invention relates to a gas bearing, in particular to a gas foil radial bearing which directly detects gas film pressure.

Background technique

Gas foil bearings have the advantages of low viscosity of gas lubricating medium, small friction, high rotation accuracy, low power consumption, etc., and have broad engineering application prospects in high-precision fields, precision instruments, and turbomachinery. At present, the research on the gas film pressure of the gas foil radial bearing is mostly based on theoretical simulation. There are many theoretical models at home and abroad to analyze the gas film pressure of the gas foil radial bearing under actual operating conditions. , and obtained very interesting results. However, gas foil radial bearings are usually used in precision equipment, and the working environment is complex. In addition, there are usually some assumptions in theoretical research and some simplifications are made to the actual environment, which will undoubtedly introduce deviations. Therefore, the significance of inventing a gas foil radial bearing that directly detects the gas film pressure and using the working mechanism of the piezoelectric film sensor to detect the change of the gas film pressure in real time is very obvious.

Contents of the invention

In order to solve the problem that the gas film pressure of the gas foil radial bearing cannot be detected in real time in an actual complex working environment, the present invention provides a gas foil radial bearing that directly detects the gas film pressure to ensure safe and reliable operation of the equipment.

In order to achieve the above object, the technical scheme that the present invention takes is:

A gas foil radial bearing that directly detects gas film pressure includes a cylindrical corrugated foil, a cylindrical top foil, a bearing sleeve, a piezoelectric film sensor, an embedded groove and a wire hole. The top foil, the corrugated foil and the bearing sleeve are arranged sequentially from the inside to the outside, and the adjacent ones are attached to each other. The top foil and the corrugated foil are respectively fixed on the bearing sleeve, and the top foil is fixed on the bearing sleeve. An embedded groove is provided for placing the piezoelectric film sensor, and the wires of the piezoelectric film sensor pass through the coaxial wire holes provided on the top foil, the corrugated foil and the bearing sleeve.

Preferably, the top foil is provided with an embedding groove for embedding the piezoelectric film sensor.

Preferably, the number of inlaid grooves opened on the top foil is three, and are evenly distributed on the top foil.

Preferably, the number of the piezoelectric film sensors is three.

Preferably, the thickness of the piezoelectric film sensor is consistent with the thickness of the embedded groove opened on the top foil, without changing the initial fit clearance of the radial bearing of the gas foil.

Preferably, the connecting wires of the piezoelectric film sensor pass through the wire hole to connect to the power collection device.

Preferably, the wire hole is a concentric hollow hole with a rectangular planar development pattern opened on the corrugated foil and the bearing sleeve.

Preferably, the planar unfolded waveforms of the corrugated foil are arc-shaped waves with a certain interval, and the orientation of the arc-shaped waves is the same.

Preferably, the distance between adjacent arc waveforms is greater than twice the arc diameter.

Preferably, the corrugations of the corrugated foil all bulge inward.

Preferably, a layer of protective material is coated on the surface of the piezoelectric film sensor, and the thickness of the protective material is negligible compared with the thickness of the top foil.

Preferably, the sensing elements of the piezoelectric film sensor are arranged sparsely and alternately, and no sensing elements are placed on the sensing edge of the piezoelectric film.

Compared with the prior art, the present invention has following beneficial effects:

The invention realizes the combination of the working mechanism of the piezoelectric thin film sensor and the radial bearing of the gas foil, thereby directly detecting the radial bearing of the gas foil in the actual working environment without changing the parameters of the radial bearing of the gas foil The gas film pressure of the gas foil radial bearing makes up for the calculation deviation caused by simplifying some assumptions in the dynamic theoretical research of the gas foil radial bearing, and provides a method for the good design of the gas foil bearing and the reliable operation of the equipment.

The invention skillfully utilizes the real-time change information of the gas film pressure and the working mechanism of the piezoelectric film sensor continuously feeding back the electric signal due to the pressure change to directly monitor the gas film pressure of the radial bearing of the gas foil in real time.

Description of drawings

Figure 1 is an exploded view of the present invention.

FIG. 2 is an assembly diagram of FIG. 1 .

Fig. 3 is a schematic diagram of the bearing sleeve in Fig. 1 .

Figure 4 is a schematic diagram of a corrugated foil

Figure 5 is a schematic diagram of the top foil

Figure 6 is a partial enlarged view of I in Figure 2

Figure 7 is a schematic diagram of the sensor element arrangement of the piezoelectric film sensor

detailed description

Below in conjunction with accompanying drawing, the present invention is described in further detail: the present embodiment implements under the premise of the technical solution of the present invention, has provided detailed implementation, but protection scope of the present invention is not limited to following narration embodiment.

Embodiment 1: This embodiment is described in conjunction with Fig. 1, Fig. 2 and Fig. 3. This embodiment designs a gas foil radial bearing that directly detects the gas film pressure, including a cylindrical corrugated foil, a cylindrical The top foil, the bearing sleeve, the piezoelectric film sensor, the embedded groove and the wire hole, the top foil, the corrugated foil and the bearing sleeve are arranged in sequence from the inside to the outside, and the adjacent two are in contact with each other, The top foil and the corrugated foil are respectively fixed on the bearing sleeve, the top foil is provided with an embedded groove, and the piezoelectric film sensor is placed in the embedded groove, and sealed and fixed.

The top foil, the corrugated foil and the wire hole opened on the bearing sleeve correspond to the same axis.

Preferably, the thickness of the piezoelectric film sensor is consistent with the thickness of the embedded groove on the top foil.

Preferably, as shown in FIG. 7 , the sensing elements of the piezoelectric film sensor are arranged sparsely and alternately.

Optionally, as shown in FIG. 4 , the waveforms in the plane of the corrugated foil are circular arc waveforms with a certain interval, and the directions of the circular arc waveforms are the same.

Optionally, as shown in the figure, the distance between two adjacent arc waveforms is greater than twice the arc diameter.

Optionally, as shown in the figure, the corrugations of the corrugated foil all bulge inwards.

The assembly process of this example: as shown in Figure 1, Figure 2, Figure 3, Figure 4, Figure 5 and Figure 6, first open the corresponding wire holes on the top foil, corrugated foil and bearing sleeve, and then open the corresponding wire holes on the top foil There are 3 evenly distributed embedded grooves on the chip, and the connecting wires of the 3 piezoelectric film sensors pass through the three wire holes of the top foil, and then the piezoelectric film sensors are sealed and fixed on the embedded grooves of the top foil. Then the wires of the three piezoelectric film sensors are passed through the wire holes on the corrugated foil and the bearing sleeve, and finally the corrugated foil and the bearing sleeve are arranged on the top foil in sequence.

Claims (7)

1. A gas foil radial bearing for direct detection of gas film pressure, characterized by: the piezoelectric film sensor comprises a cylindrical waveform foil (2), a cylindrical top foil (3), a bearing shell (1) and a piezoelectric film sensor (4), wherein the top foil (3), the waveform foil (2) and a bearing sleeve (1) are sequentially arranged from inside to outside, and are adjacent to each other, the top foil (3) and the waveform foil (2) are respectively fixed on the bearing sleeve (1), an embedded groove (6) of the piezoelectric film sensor is formed in the top foil (3), and the top foil (3), the waveform foil (2) and the bearing sleeve (1) are provided with corresponding and communicated piezoelectric film sensor wire holes (5).

2. A gas foil radial bearing for direct detection of gas film pressure as claimed in claim 1 wherein: the number of the wire holes (5) is three, and the planar shape of the wire holes (5) is rectangular.

3. A gas foil radial bearing for direct detection of gas film pressure as claimed in claim 1 wherein: the wave form of the plane expansion of the wave form foil (2) is arc wave with a certain distance, and the orientation of the arc wave is the same.

4. A gas foil radial bearing for direct detection of gas film pressure as claimed in claim 1 wherein: the planar expansion shape of the piezoelectric film sensor (4) is rectangular, and the thickness is 0.05-0.1mm.

5. A gas foil radial bearing for direct detection of gas film pressure as claimed in claim 1 wherein: the sensing elements of the piezoelectric film sensor (4) are arranged in a sparse and alternate manner.

6. A gas foil radial bearing for direct detection of gas film pressure as claimed in claim 1 wherein: the plane expansion pattern of the embedded groove (6) is rectangular.

7. A gas foil radial bearing for direct detection of gas film pressure as claimed in any one of claims 1 to 6, wherein: the wave shapes of the wave-shaped foil pieces (2) are all bulged inwards.

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