CN214247994U - Net-shaped radial gas foil bearing - Google Patents

Abstract

The utility model discloses a reticular radial gas foil bearing, which relates to the technical field of gas foil bearings and comprises a bearing sleeve, a top layer foil and an elastic foil component, wherein the top foil is positioned in the bearing sleeve, the first end and the second end of the top foil are oppositely arranged and have a gap, the first end of the top foil is relatively fixed with the bearing sleeve, the second end of the top foil can move relative to the bearing sleeve, the elastic foil assembly is positioned between the bearing sleeve and the top foil, the first end and the second end of the elastic foil piece assembly are oppositely arranged and provided with a gap, the first end of the elastic foil piece assembly is oppositely fixed with the position of the bearing sleeve, the elastic foil piece assembly comprises n layers of elastic foil pieces, two adjacent layers of elastic foil pieces are fixedly connected, each layer of elastic foil piece is provided with a plurality of holes, and the holes of each layer of elastic foil are staggered with each other, and n is a positive integer greater than or equal to 2. So set up, the problem that dynamic pressure air bearing among the prior art is yielding and makes mechanical equipment break down in the operating mode has been solved.

Description

Net-shaped radial gas foil bearing

Technical Field

The utility model relates to a gaseous foil bearing technical field, more specifically say, relate to a netted radial gaseous foil bearing.

Background

The air foil bearing has the advantages of small friction loss, almost no friction at a very high rotating speed, good high-temperature stability, small vibration, no need of lubricating oil and the like, is widely applied to machines such as an air circulator, an air blower, a fuel cell air compressor, a micro gas turbine and the like, and has very wide application prospects in the fields of low-temperature and high-temperature technologies, high-speed penetration and space technologies and the like.

The dynamic pressure air bearing is a common air foil bearing, is composed of one or more layers of corrugated wave foils and a top foil, has a good flexible surface, and can suck gas with certain viscosity into a wedge-shaped space between a shaft and the bearing top foil to extrude by means of relative motion of the shaft and the bearing surface during operation, so that a lubricating gas film with certain pressure is formed, and the rotating shaft is suspended. Referring to fig. 1, when a wedge-shaped space exists between two surfaces moving relative to each other, the surfaces moving relative to each other continuously drive gas into the wedge-shaped groove, so that a dynamic pressure gas film 403 with a certain pressure is formed in the wedge-shaped groove, that is, the dynamic pressure gas film 403 is located between the inner surface 402 of the bearing and the rotating shaft 401, and when the pressure of the dynamic pressure gas film 403 is large enough to support a load, the rotating shaft 401 is suspended, and the friction force disappears.

However, when a conventional dynamic pressure air bearing in the prior art is under complicated working conditions such as a vehicle-mounted fuel cell air compressor, a micro gas turbine, a large load or an impact load, the support structure is easy to deform due to small damping and poor impact resistance, and mechanical equipment failure is easily caused.

Therefore, how to solve the problem that the dynamic pressure air bearing in the prior art is easy to deform in a working condition so that mechanical equipment fails becomes an important technical problem to be solved by technical personnel in the field.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a netted radial gas foil bearing, it has solved the yielding problem that makes mechanical equipment break down in the operating mode than dynamic pressure air supporting bearing among the prior art. The utility model provides a plurality of technical effects that preferred technical scheme among a great deal of technical scheme can produce see the explanation below in detail.

In order to achieve the above purpose, the utility model provides a following technical scheme:

the utility model provides a pair of netted radial gas foil bearing, include:

a bearing housing;

the top foil is positioned in the bearing sleeve, a first end and a second end of the top foil are oppositely arranged and have a gap, the first end of the top foil is relatively fixed with the bearing sleeve, and the second end of the top foil can move relative to the bearing sleeve;

the elastic foil assembly is positioned between the bearing sleeve and the top layer foil, a first end and a second end of the elastic foil assembly are oppositely arranged and have a gap, the first end of the elastic foil assembly is relatively fixed with the bearing sleeve, the elastic foil assembly comprises n layers of elastic foils, two adjacent layers of the elastic foils are fixedly connected, each layer of the elastic foil is provided with a plurality of holes, and the holes of each layer of the elastic foil are mutually staggered; wherein n is a positive integer greater than or equal to 2.

Preferably, the end portion of the bearing sleeve is provided with a pin hole, the inner wall of the bearing sleeve is provided with a communicating groove, the communicating groove is communicated with the pin hole, the first end of the top foil is provided with a fixing piece, the fixing piece is located in the pin hole and the communicating groove, and a pin is inserted into the pin hole to limit the fixing piece from slipping off the bearing sleeve.

Preferably, the inner wall of the bearing sleeve is provided with a limiting groove, the second end of the top foil is provided with a slip sheet, and the slip sheet extends into the limiting groove and can slide along the limiting groove.

Preferably, the depth direction of the positioning groove is perpendicular to the axis of the bearing sleeve.

Preferably, the slider is tangential to the top foil.

Preferably, the number of the fixed plates is two, and the sliding sheet penetrates between the two fixed plates.

Preferably, the inner wall of the bearing sleeve is provided with a positioning groove, the first end of the elastic foil assembly is provided with a positioning piece, and the positioning piece is embedded into the positioning groove.

Preferably, the holes of the elastic foil are square holes, and all the square holes of the elastic foil assembly are the same in size.

Preferably, two adjacent layers of the elastic foils are connected at intervals by spot welding.

Preferably, n is equal to 3.

The utility model provides an among the technical scheme, netted radial gas foil bearing includes the bearing housing, top layer foil and elastic foil piece subassembly, wherein, the top layer foil is arranged in the bearing housing, the first end of top layer foil sets up relatively with the second end and has the clearance, the first end and the bearing housing position relatively fixed of top layer foil, the second end of top layer foil can remove for the bearing housing, the elastic foil piece subassembly is located between bearing housing and the top layer foil, its first end sets up relatively with the second end and has the clearance, the first end and the bearing housing position relatively fixed of elastic foil piece subassembly, the elastic foil piece subassembly includes n layer elastic foil piece, adjacent two-layer elastic foil piece fixed connection, every layer elastic foil piece all is equipped with a plurality of holes, and crisscross each other between the hole of each layer elastic foil piece, n is for being more than or equal to 2 positive integer. When the bearing operates, the top foil is located in the circumferential direction of the rotating shaft, the first end of the top foil is fixed, the second end of the top foil is free, the top foil is favorably stretched in the circumferential direction, the bearing gap is stably controlled, the elastic foils of each layer of the elastic foil assembly are supported at intervals, an elastic supporting structure is formed, due to the power air film, the elastic foil assembly generates elastic deformation, staggered friction is generated between the elastic foils after elastic deformation, sufficient rigidity and damping characteristics are provided for the bearing, the elastic foil assembly cannot generate plastic deformation due to the mutual supporting effect among the multiple layers of the elastic foils, the impact resistance is improved, the bearing is not easy to damage, and further the mechanical equipment is not easy to break down when in operation. So set up, the problem that dynamic pressure air bearing among the prior art is yielding and makes mechanical equipment break down in the operating mode has been solved.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, other drawings can be obtained according to the drawings without creative efforts.

FIG. 1 is a schematic diagram of a dynamic pressure gas bearing in the prior art;

fig. 2 is a schematic diagram of an exploded structure of a mesh radial gas foil bearing according to an embodiment of the present invention;

fig. 3 is a schematic view of the overall structure of a mesh radial gas foil bearing according to an embodiment of the present invention;

FIG. 4 is a schematic view of the structure at A in FIG. 3;

FIG. 5 is a schematic diagram illustrating a positional relationship between a bearing sleeve and a top foil according to an embodiment of the present invention;

FIG. 6 is a schematic view of the structure at B in FIG. 5;

FIG. 7 is a schematic diagram of a position relationship between a bearing sleeve and an elastic foil assembly according to an embodiment of the present invention;

FIG. 8 is a schematic view of the structure at C in FIG. 7;

fig. 9 is a schematic diagram of an exploded structure of an elastic foil assembly according to an embodiment of the present invention;

fig. 10 is a schematic view of an expanded structure of an elastic foil assembly according to an embodiment of the present invention.

In fig. 1-10:

1. a bearing housing; 2. a top foil; 3. an elastic foil assembly; 4. a pin hole; 5. a communicating groove; 6. a fixing sheet; 7. a limiting groove; 8. sliding blades; 9. positioning a groove; 10. positioning plates; 31. an elastic foil; 401. a rotating shaft; 402. an inner bearing surface; 403. and (4) pressing the gas film.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention clearer, the technical solutions of the present invention will be described in detail below. It is to be understood that the embodiments described are only some embodiments of the invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.

An object of this embodiment is to provide a mesh radial gas foil bearing, which can solve the problem that dynamic pressure gas bearing in the prior art is easy to deform in the working condition and causes mechanical equipment to break down.

Hereinafter, embodiments will be described in detail with reference to the accompanying drawings. The embodiments described below do not limit the scope of the invention described in the claims. Further, the entire contents of the configurations shown in the following embodiments are not limited to those necessary as a solution of the invention described in the claims.

Referring to fig. 2 to 10, the mesh-type radial gas foil bearing provided in this embodiment includes a bearing housing 1, a top foil 2, and an elastic foil assembly 3, wherein the bearing housing 1 has a central hole, the cross section of which is circular, the top foil 2 is rectangular in an unfolded state, and is curled into a cylindrical shape and located in the bearing housing 1, a first end and a second end of the top foil 2 are oppositely disposed and have a gap, the first end of the top foil 2 is relatively fixed to the bearing housing 1, the second end of the top foil 2 is movable relative to the bearing housing 1, the elastic foil assembly 3 is rectangular in an unfolded state, and is curled into a cylindrical shape and located between the bearing housing 1 and the top foil 2, the first end and the second end of the elastic foil assembly 3 are oppositely disposed and have a gap, the first end of the elastic foil assembly 3 is relatively fixed to the bearing housing 1, the elastic foil assembly 3 includes n layers of elastic foils 31, two adjacent layers of elastic foils 31 are fixedly connected, each layer of elastic foil 31 is provided with a plurality of holes, the holes of each layer of elastic foil 31 are staggered with each other, and n is a positive integer greater than or equal to 2.

With the arrangement, when in operation, the top foil 2 is positioned in the circumferential direction of the rotating shaft, the first end of the top foil 2 is fixed, the second end is free, which is beneficial to expanding the top foil 2 in the circumferential direction, so that the bearing gap is stably controlled, the layers of elastic foils 31 of the elastic foil assembly 3 are supported at intervals to form an elastic support structure, due to the dynamic air film, the elastic foil assembly 3 generates elastic deformation, and the elastic foils 31 generate mutual staggered friction after the elastic deformation, thereby providing enough rigidity and damping characteristic for the bearing, and due to the mutual supporting action among the plurality of layers of elastic foils 31, the elastic foil assembly 3 does not generate plastic deformation, the impact resistance is improved, so that the bearing is not easy to damage, and further, the mechanical equipment is not easy to break down when in operation, and the problem that the dynamic pressure air bearing in the prior art is easy to deform in a working condition to cause the mechanical equipment to break down is solved.

Moreover, the manufacturing quality of the bearing and the manufacturing consistency among the bearings are improved. In addition, the manufacturing process of common dynamic pressure air supporting bearing among the prior art is long, the technology is complicated, and the technology that involves includes punching press, thermal treatment, welding, assembly etc. not only the installation accuracy requires highly, makes the uniformity moreover and is difficult to control, the technical scheme of the utility model provides a netted radial gas foil bearing, top layer foil 2 and elastic foil subassembly 3 only relate to the laser cutting technology, need not thermal treatment and punching press, and processing is simple, has greatly simplified manufacturing process.

As a specific embodiment, the inner wall of the bearing sleeve 1 is provided with a positioning groove 9 communicated with the central hole thereof, the first end of the elastic foil assembly 3 is provided with a positioning piece 10, and preferably, each layer of elastic foil 31 is provided with a positioning piece 10, when assembling, the elastic foil assembly 3 is curled to be a cylinder shape and enters the central hole of the bearing sleeve 1, and the positioning piece 10 is embedded into the positioning groove 9.

As a preferred embodiment, the depth direction of the positioning groove 9 may be perpendicular to the axis of the bearing housing 1, that is, in the cross section of the reticular radial gas foil bearing, the symmetry line of the positioning groove 9 coincides with the straight line of the diameter of the bearing housing 1, and the length direction of the positioning groove 9 is consistent with the length direction of the bearing housing 1.

More specific embodiment, the tip of bearing housing 1 is equipped with pin hole 4, the inner wall of bearing housing 1 is equipped with intercommunication groove 5, intercommunication groove 5 and pin hole 4 intercommunication, pin hole 4 can set up to blind hole or through-hole, intercommunication groove 5 link up the tip of bearing housing 1, the first end rigid coupling of top layer foil 2 has stationary blade 6, pin hole 4 is located between spacing groove 7 and the constant head tank 9, during the assembly, top layer foil 2 curls and is the tube-shape and gets into in elastic foil subassembly 3, stationary blade 6 gets into in pin hole 4 and intercommunication groove 5, insert pin hole 4 through the pin, restrict stationary blade 6 along the length direction and the bearing housing 1 slippage of bearing housing 1, so set up, can realize dismantling the connection, the assembly process is simple.

Further, be equipped with spacing groove 7 on the inner wall of bearing housing 1, the second end rigid coupling of top layer foil 2 has gleitbretter 8, and gleitbretter 8 stretches into in spacing groove 7 and the atress can slide along the groove depth direction of spacing groove 7, so set up, when guaranteeing that the second end of top layer foil 2 has the degree of freedom, can guarantee that top layer foil 2 does not take place the skew.

Furthermore, the sliding piece 8 is preferably arranged to be tangential to the top foil 2, and when the top foil 2 is forced to expand outwards or contract inwards, the second end of the top foil 2 moves smoothly in the tangential direction.

In a more preferred embodiment, two fixing pieces 6 are provided and are respectively located at two edges of the first end of the top foil 2, and the sliding piece 8 is located at the middle part of the second end of the top foil 2 and passes through between the two fixing pieces 6, i.e. the fixing pieces 6 and the first end of the top foil 2 are concave, and the sliding piece 8 and the second end of the top foil 2 are convex.

Specifically, n is set to be equal to 3, that is, the elastic foil assembly 3 has three layers of elastic foils 31, and the deformation range of the elastic foil assembly 3 is the thickness of a single layer of elastic foil 31, so that plastic deformation cannot occur, and the bearing is not easily damaged.

In addition, it is preferable that the holes of the elastic foil 31 are square holes, that is, the elastic foil 31 is woven, the square holes of the three layers of elastic foils 31 are staggered with each other, all the square holes of the formed elastic foil assembly 3 are uniform in size and are arranged uniformly, and the size of the square hole of the elastic foil assembly 3 is one ninth of the size of the square hole of the elastic foil 31.

In order to further optimize the manufacturing process of the reticular radial gas foil bearing, the two adjacent layers of elastic foils 31 are preferably arranged to be connected in a spot welding mode at intervals, namely, a columnar electrode is used during welding, welding spots are formed between the contact surfaces of the two adjacent layers of elastic foils 31, the welding speed is high, the operation is simple, and the production efficiency is high.

It is understood that the same or similar parts in the above embodiments may be mutually referred to, and the same or similar parts in other embodiments may be referred to for the content which is not described in detail in some embodiments. The utility model provides a plurality of schemes contain the basic scheme of itself, mutual independence to restrict each other, but it also can combine each other under the condition of not conflicting, reaches a plurality of effects and realizes jointly.

The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims (10)

1. A reticulated radial gas foil bearing, comprising:

a bearing housing (1);

the top foil (2) is positioned in the bearing sleeve (1), a first end and a second end of the top foil (2) are arranged opposite to each other and have a gap, the first end of the top foil (2) and the bearing sleeve (1) are relatively fixed in position, and the second end of the top foil (2) can move relative to the bearing sleeve (1);

the elastic foil assembly (3) is positioned between the bearing sleeve (1) and the top foil (2), a first end and a second end of the elastic foil assembly (3) are arranged oppositely and provided with gaps, the first end of the elastic foil assembly (3) is fixed relative to the bearing sleeve (1), the elastic foil assembly (3) comprises n layers of elastic foils (31), two adjacent layers of elastic foils (31) are fixedly connected, each layer of elastic foil (31) is provided with a plurality of holes, and the holes of each layer of elastic foil (31) are staggered with each other; wherein n is a positive integer greater than or equal to 2.

2. A radial gas foil mesh bearing as claimed in claim 1, wherein the end of the bearing housing (1) is provided with a pin hole (4), the inner wall of the bearing housing (1) is provided with a communicating groove (5), the communicating groove (5) is communicated with the pin hole (4), the first end of the top foil (2) is provided with a fixing plate (6), the fixing plate (6) is located in the pin hole (4) and the communicating groove (5), and a pin is inserted into the pin hole (4) to limit the fixing plate (6) from slipping off the bearing housing (1).

3. A radial gas foil mesh bearing according to claim 2, wherein the inner wall of the bearing housing (1) is provided with a limiting groove (7), the second end of the top foil (2) is provided with a sliding piece (8), and the sliding piece (8) extends into the limiting groove (7) and can slide along the limiting groove (7).

4. A reticulated radial gas foil bearing as claimed in claim 3, wherein said sliding vanes (8) are tangential to said top foil (2).

5. A reticulated radial gas foil bearing as claimed in claim 3, wherein there are two of said stator plates (6), said sliding vane (8) passing between two of said stator plates (6).

6. A reticulated radial gas foil bearing according to claim 1, wherein the bearing sleeve (1) is provided with a positioning groove (9) on an inner wall thereof, the flexible foil assembly (3) is provided with a positioning tab (10) at a first end thereof, and the positioning tab (10) is embedded in the positioning groove (9).

7. A reticulated radial gas foil bearing according to claim 6, wherein the depth of the positioning grooves (9) is perpendicular to the axis of the bearing sleeve (1).

8. A reticulated radial gas foil bearing as claimed in claim 1, wherein the pores of the flexible foil (31) are square pores, all of the square pores of the flexible foil assembly (3) being of uniform size.

9. A reticulated radial gas foil bearing as claimed in claim 1, wherein two adjacent layers of said flexible foil (31) are spot welded at intervals.

10. The reticulated radial gas foil bearing of claim 1, wherein n is equal to 3.

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