CN210509514U - Supporting device and compressor - Google Patents

Abstract

The utility model relates to a strutting arrangement and compressor, strutting arrangement is used for setting up on the bent axle of compressor with the restriction the amount of deflection of bent axle, strutting arrangement includes support piece and air supporting structure, the last mounting hole of having seted up of support piece, the air supporting structure set up in the mounting hole and be used for the cover to establish on the bent axle, just the air supporting structure is configured to work as during the crankshaft rotation be used for with form the air film between the bent axle. The utility model has the advantages of, the friction loss of reducible compressor operation in-process bent axle improves bent axle life, improves the complete machine structural reliability of compressor.

Description

Supporting device and compressor

Technical Field

The invention relates to the field of electrical equipment, in particular to a supporting device and a compressor.

Background

With the improvement of living standard, the demand of refrigeration equipment is increasing, and the market demand of household refrigeration equipment such as refrigerators, air conditioners and the like is striking. As far as the refrigeration equipment is concerned, a compressor is basically used, which is an indispensable component of the refrigeration equipment, and a rolling rotor type compressor is widely used in the fields of air conditioners, refrigerators, and the like.

As shown in fig. 1, the conventional rolling rotor type compressor includes a compressor body 100'; the compressor body 100 ' includes a housing 110 ', a compressor motor 120 ' is disposed in the housing 110 ', and the compressor motor 120 ' includes a motor stator 121 ', an electronic rotor 122 ' and a crankshaft 123 ', wherein the motor stator 121 ' generates a magnetic force after power is applied, the electronic rotor 122 ' is disposed inside the motor stator 121 ' and rotates, and the crankshaft 123 ' is connected to the motor rotor 122 ' and rotates with the rotation of the motor rotor. In practice, the casing 110' is mostly vertically arranged, however, with the ever increasing displacement and size of the rolling rotor compressor and the increasing energy efficiency label, the trend of frequency conversion is highlighted, resulting in the increase of motor stack height. Under the conditions of high motor stack height and high rotating speed, the stress of the crankshaft is continuously increased, and the deflection control of the upper part of the crankshaft is a difficult problem due to the limitation of the shaft diameter.

At present, the problem of deflection control of the upper portion of the crankshaft 123 'is mostly solved by adding a supporting device 200' on the upper portion of the crankshaft 123 ', the supporting device 200' is directly sleeved on the crankshaft 123 ', and the supporting device 200' is always in contact with the crankshaft 123 'to achieve constraint on the upper portion of the crankshaft 123'. However, since support device 200 'is in direct contact with crankshaft 123' and support device 200 'is located above compressor body 100', it is difficult to lubricate the oil passage therebetween. In this case, when the compressor is operated, friction is generated between the crankshaft 123 'and the supporting device 200' to cause wear of the crankshaft, which affects reliability of the overall structure of the compressor.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a strutting arrangement and compressor can reduce the loss that the bent axle caused because of the friction, improves the complete machine reliability of compressor.

In order to achieve the above object, the present invention provides a supporting device for supporting a crankshaft of a compressor, the supporting device includes a supporting member and an air-floating structure, the supporting member is provided with a mounting hole, and the air-floating structure is disposed in the mounting hole and is used for being sleeved on the crankshaft; the air floating structure is configured to form an air film with the crankshaft when the crankshaft rotates.

Optionally, the air floating structure includes an elastic sheet capable of deforming along the radial direction of the mounting hole, and the elastic sheet is annular and is arranged in the mounting hole so as to be sleeved on the crankshaft.

Optionally, the supporting device further includes a limiting assembly, the limiting assembly includes a first limiting member and a second limiting member, the first limiting member and the second limiting member are disposed on the supporting member, and the first limiting member and the second limiting member are respectively located on two opposite sides of the elastic piece along an axial direction of the crankshaft.

Optionally, the first limiting part is a snap spring, and the second limiting part is a limiting step in the mounting hole; or, the first limiting part is a limiting step in the mounting hole, and the second limiting part is a snap spring; or, the first limiting part and the second limiting part are both snap springs.

Optionally, an anti-friction gasket is disposed between the first limiting member and the elastic sheet, and/or an anti-friction gasket is disposed between the second limiting member and the elastic sheet.

Optionally, the air floating structure further includes a top foil disposed on a side of the elastic sheet facing the crankshaft, where the top foil is annular and can deform in a radial direction of the mounting hole to provide a radial supporting force for the elastic sheet.

Optionally, a top sheet extending towards the inner wall direction of the mounting hole is arranged on the top foil, a positioning groove is formed in the inner wall of the mounting hole, and the top sheet extends and is inserted into the positioning groove.

Optionally, the top sheet is formed by bending the top foil tail.

Optionally, the air-floating structure is an air-floating bearing, the air-floating bearing includes a fixing ring and a plurality of foil sheets, a plurality of fixing grooves recessed along a radial direction of the fixing ring are formed on an inner surface of the fixing ring, the foil sheets have a first end and a second end opposite to each other, the first end is disposed in the fixing grooves, a distance between the foil sheets and the inner surface of the fixing ring gradually increases from the first end to the second end, and at least a part of two adjacent foil sheets is overlapped.

Furthermore, in order to achieve the above object, the present invention provides a compressor, which comprises a crankshaft and the supporting device, wherein the supporting device is sleeved on the crankshaft.

Compared with the prior art, the utility model discloses a strutting arrangement and compressor have following advantage:

the utility model discloses a strutting arrangement includes support piece and air supporting structure, the last mounting hole of having seted up of support piece, the air supporting structure set up in the mounting hole and the cover are established on the bent axle, when crankshaft rotation, formation air film is used for supporting the bent axle between bent axle and air supporting structure to make bent axle and air supporting structure itself need not direct contact, and then avoid the production of friction, guarantee the complete machine structural reliability of compressor.

Drawings

Fig. 1 is a schematic structural view of a conventional rolling rotor type compressor;

fig. 2 is a schematic structural diagram of a supporting device according to an embodiment of the present invention;

FIG. 3 is a partial cross-sectional view of the support device shown in FIG. 2;

fig. 4 is an enlarged schematic view of the support device shown in fig. 2 at a.

Fig. 5 is a schematic structural view of a support member in the supporting device shown in fig. 2.

Fig. 6 is a schematic structural diagram of a compressor according to an embodiment of the present invention;

fig. 7 is a schematic structural diagram of an air bearing in a support device according to another embodiment of the present invention.

In the figure:

200', 100-support means;

110-a support;

111-mounting hole, 112-first limiting piece, 113-second limiting piece and 114-positioning groove;

120-air floating structure;

121-shrapnel, 122-top foil, 123-top sheet, 124-fixing ring, 125-foil, 126-fixing groove;

100', 200-compressor body;

110', 210-shell;

120' 220-compressor motor;

121 ', 221-motor stator, 122 ', 222-motor rotor, 123 ', 223-crankshaft;

Detailed Description

To make the objects, advantages and features of the present invention clearer, the supporting device and the compressor proposed by the present invention will be further described in detail with reference to the accompanying drawings. It should be noted that the drawings are in simplified form and are not to precise scale, and are provided for convenience and clarity in order to facilitate the description of the embodiments of the present invention.

As used in this specification and the appended claims, the singular forms "a", "an", and "the" include plural referents unless the content clearly dictates otherwise. As used in this specification and the appended claims, the term "or" is generally employed in its sense including "and/or" unless the content clearly dictates otherwise, and the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either fixedly connected, detachably connected, or integrally connected. Either mechanically or electrically. Either directly or indirectly through intervening media, either internally or in any other relationship. The specific meaning of the above terms in the present invention can be understood according to specific situations by those skilled in the art. The same or similar reference numbers in the drawings identify the same or similar elements.

A supporting device 100 is provided in this embodiment, and fig. 2 is a schematic structural diagram of the supporting device 100 in this embodiment. As shown in fig. 2, the supporting device 100 includes a support 110 and an air floating structure 120, wherein a through mounting hole 111 is axially formed in the support 110, and the air floating structure 120 is disposed in the mounting hole 111. In practical use, the air floating structure 120 is used to be sleeved on a crankshaft of a compressor, such as a rolling rotor compressor, and in the normal operation process of the compressor, when the crankshaft starts to operate, an air film is formed between the air floating structure 120 and the crankshaft, and when the crankshaft reaches a certain rotation speed, the air film can generate a sufficient acting force and provide a supporting force for the crankshaft to control the deflection of the crankshaft, so that the crankshaft is not in direct contact with the air floating structure 120, the generation of friction is avoided, and the reliability of the whole compressor is improved. It should be understood that the rotation speed of the crankshaft when the air film formed between the air floating structure 120 and the crankshaft can generate the supporting force enough to support the crankshaft should be determined according to the actual situation, and the rotation speed depends on the nature of the air floating structure 120 itself, so the utility model discloses do not limit the crankshaft rotation speed this moment.

Please refer to fig. 6 for a schematic structural diagram of the compressor. As shown in fig. 6, the present embodiment further provides a compressor, which includes a compressor body 200 and a supporting device 100, wherein the compressor body 200 includes a housing 210 and a compressor motor 220, the housing 210 may be a long cylindrical housing and has an inner space, and preferably, the housing 210 is arranged vertically (i.e., the axis of the housing 210 is arranged vertically). The compressor motor 220 is disposed in the housing 210 and includes a motor stator 221, a motor rotor 222 and a crankshaft 223, the motor stator 221 is sleeved on the motor rotor 222, the motor rotor 222 has an inner hole (not labeled in the figure), the crankshaft 223 extends along the axial direction of the housing 210 and is connected to the motor rotor 222 through the inner hole of the motor rotor 222, meanwhile, the upper end of the crankshaft 223 extends out of the compressor motor 220, the supporting member 110 of the supporting device 100 is fixed to the housing 210, and meanwhile, the air floating structure 120 of the supporting device 100 is sleeved on the portion of the crankshaft 223 extending out of the motor rotor 222. When the compressor is powered on, the motor stator 221 generates magnetic force by the applied power to drive the motor rotor 222 to rotate, and at the same time, the crankshaft 223 rotates with the motor rotor 222.

Dividing the running state of the compressor from stop to start to stop: stopping, starting, normal running and inertia stopping. When the compressor is in a starting state, the rotating speed of the crankshaft 223 is gradually accelerated from zero to a preset working rotating speed, in the process, the deflection of the crankshaft is gradually increased, and simultaneously, the dynamic pressure between the crankshaft 223 and the air floating structure 120 is also gradually increased, so that an air film is formed between the crankshaft 223 and the air floating structure 120 to support the crankshaft 223, and before the supporting force of the air film is insufficient to support the crankshaft 223, the crankshaft 223 and the air floating structure 120 are in contact and have friction; when the compressor enters a normal operation state, the supporting force generated by the air film can support the crankshaft 223, and dynamic pressure is stable and maintains the air film in the process, so that the crankshaft 223 and the air floating structure 120 are not contacted completely, and no friction exists between the crankshaft 223 and the air floating structure 120; when the compressor stops due to inertia, the load of the compressor is reduced, no motor traction torque is generated, so that the stress of the crankshaft 223 is reduced, and at the moment, the crankshaft 223 can be prevented from contacting the air floatation structure 120 by using the rigidity of the crankshaft 223 per se, namely, when the compressor stops due to inertia, no friction exists between the crankshaft 223 and the air floatation structure 120. That is, by adding the air floating structure 120 and sleeving the air floating structure 120 on the crankshaft 223, the crankshaft 223 will contact with the supporting device 100 to generate friction only during the starting process of the compressor, and there is no friction between the crankshaft 223 and the supporting device 100 in the normal operation state of the compressor, thereby reducing the friction loss of the crankshaft 223 to the maximum extent, and prolonging the service life and the overall reliability of the compressor.

The specific structure of the air floating structure 120 will be described next.

Fig. 2 shows a schematic view of the support device 100 in one embodiment. As shown in fig. 2, the air floating structure 120 includes a resilient tab 121, the resilient tab 121 is disposed along an inner wall of the mounting hole 111 and sleeved on the crankshaft 223, and the resilient tab 121 can deform radially. Specifically, when the air floating structure 120 is sleeved on the crankshaft 223 and the crankshaft 223 rotates to form an air film and generate an acting force, the elastic sheet 121 may be compressed without contacting the crankshaft 223. In detail, the elastic sheet 121 may be in a wave shape, a zigzag shape or other shapes capable of generating radial deformation, and in addition, the elastic sheet 121 may be in a continuous ring shape, or the elastic sheet 121 includes a plurality of sub-elastic sheets arranged at intervals in a ring shape.

Further, as shown in fig. 3, the supporting device 100 further includes a limiting component for restricting the displacement of the elastic sheet 121 along the axial movement of the crankshaft 223, so as to prevent the elastic sheet 121 from coming out of the mounting hole 111. In detail, the limiting assembly includes a first limiting member 112 and a second limiting member 113, the first limiting member 112 is disposed on the supporting member 110 and located above the elastic sheet 121, and the second limiting member 113 is disposed on the supporting member 110 and located below the elastic sheet 121 (that is, the first limiting member 112 and the second limiting member 113 are respectively located at two sides of the elastic sheet 121 along the axial direction). As an example, the first limiting member 112 may be a snap spring, and the second limiting member 113 may be a limiting step in the mounting hole 111; or, the first limiting part 112 is a limiting step, and the second limiting part 113 is a snap spring; or, the first limiting member 112 and the second limiting member 113 are both snap springs.

As a further improvement, an anti-friction gasket (not labeled in the drawings) made of Polytetrafluoroethylene (PTFE) may be disposed between the first limiting member 112 and the elastic sheet 121, so as to reduce noise generated by friction between the elastic sheet and the limiting member when the compressor operates, and reduce friction force and increase reliability. Correspondingly, an anti-friction gasket (not labeled in the figures) made of PTFE may be disposed between the second stopper 113 and the elastic piece 121.

When the air floating structure 120 and the crankshaft 223 are assembled, after the crankshaft 223 is inserted into the air floating structure 120, a certain gap may exist between the elastic piece 121 and the crankshaft 223, and the size of the gap may be adjusted according to actual conditions.

In this embodiment, after the compressor is started, as the rotation speed of the crankshaft 223 increases, the dynamic pressure between the crankshaft 223 and the elastic piece 121 gradually increases and forms an air film, so as to generate an acting force between the elastic piece 121 and the crankshaft 223, and the acting force not only presses the elastic piece 121 in a radial direction towards the inner wall of the mounting hole 111, but also pushes the crankshaft 223 in a radial direction, so that the crankshaft 223 is far away from the elastic piece 121 and does not contact the elastic piece 121.

Preferably, with reference to fig. 2 in combination with fig. 4 and 5, the air floating structure 120 may further include a top foil 122, where the top foil 122 may be annular and disposed between the elastic sheet 121 and the crank 223, and the top foil 122 may be capable of deforming along a radial direction of the mounting hole 111 and providing a radial supporting force for the elastic sheet 121. Specifically, both ends (both ends in the circumferential direction) of the top foil 122 abut to form a circular ring shape, and when the top foil 122 is subjected to a radial force toward the inner wall of the mounting hole 111, the radial dimension of the top foil 122 increases and deformation occurs (the both ends of the top foil 122 are away from each other to form an opening).

Preferably, the top foil 122 is provided with at least one top plate 123 extending towards the inner wall of the mounting hole 111, and the inner wall of the mounting hole 111 is formed with positioning grooves 114, the number of the positioning grooves 114 is the same as that of the top plates 123, the top plates 123 extend and are inserted into the positioning grooves 114, and the positioning grooves 114 are used for restricting the circumferential rotation of the top foil 122, so as to prevent the top foil 122 and the elastic sheets 121 from continuously rotating in the mounting hole 111 to generate noise. It should be appreciated that the top sheet 123 and the top foil 122 may be integrally formed, in particular, the top sheet 123 is formed by bending the tail of the top foil 122; or can be prepared separately and then welded or connected together in other ways. The size of the positioning groove 114 should be set according to the thickness of the top sheet 123 and the deformation amount of the top foil 122 when the compressor is normally operated, so as to meet the deformation requirement of the top foil 122.

In addition, as shown in fig. 6, due to the large radial dimension of the air floating structure 120, the supporting device 100 needs to be lifted to be located at the upper portion of the motor rotor 222 when the supporting device 100 and the crankshaft 223 are assembled.

Referring to FIG. 7, in another embodiment, the air bearing structure 120 may be an air bearing. FIG. 7 shows a schematic view of an alternative air bearing configuration. As shown in fig. 7, the air bearing includes a fixing ring 124 and a plurality of foils 125, wherein a plurality of fixing grooves 126 are formed on an inner surface of the fixing ring 124, the fixing grooves 126 are recessed along a radial direction of the fixing ring, the foils 125 may be, for example, arc-shaped, the foils 125 have opposite first ends and second ends, the first ends are disposed in the fixing grooves 126, a distance between the foils 125 and the inner surface of the fixing ring 124 increases gradually from the first ends to the second ends, and at least a portion of two adjacent foils 125 overlaps.

The air bearing is assembled to an inner wall of the mounting hole 111 of the support 110 and is sleeved on the crankshaft 223. When the compressor is operated, an air film is formed between the foil 125 and the crankshaft 223 to generate a force, and the force radially presses the foil 125 to make the foil 125 close to the fixing ring 124, and simultaneously pushes the crankshaft 223 away from the foil 125, so that the crankshaft 223 and the foil 125 cannot be contacted.

To sum up, the embodiment of the utility model provides a strutting arrangement and compressor through set up the air supporting structure between support piece and bent axle, produces the air film because of the dynamic pressure between bent axle and air supporting structure when the compressor operation, and by the air film produces the holding power so that bent axle and air supporting structure contactless to make the compressor bent axle not receive the frictional force effect when normal operating. Namely, the utility model provides a strutting arrangement and compressor only contact at the in-process bent axle that the compressor started and strutting arrangement, from this, greatly reduced the wearing and tearing of bent axle, improve the life of bent axle, improve the complete machine structural reliability of compressor.

Although the present invention is disclosed above, it is not limited thereto. 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, if such modifications and variations of the present invention fall within the scope of the claims and their equivalents, the present invention is also intended to include such modifications and variations.

Claims (10)

1. A supporting device is used for supporting a crankshaft of a compressor and is characterized by comprising a supporting piece and an air floating structure, wherein the supporting piece is provided with a mounting hole, and the air floating structure is arranged in the mounting hole and is sleeved on the crankshaft; the air floating structure is configured to form an air film with the crankshaft when the crankshaft rotates.

2. The supporting device as claimed in claim 1, wherein the air-floating structure includes a resilient piece capable of deforming along a radial direction of the mounting hole, and the resilient piece is annular and disposed in the mounting hole to fit over the crankshaft.

3. The supporting device according to claim 2, further comprising a limiting component, wherein the limiting component comprises a first limiting member and a second limiting member, the first limiting member and the second limiting member are disposed on the supporting member, and the first limiting member and the second limiting member are respectively located at two opposite sides of the elastic piece along an axial direction of the crankshaft.

4. The supporting device as claimed in claim 3, wherein the first limiting member is a snap spring, and the second limiting member is a limiting step in the mounting hole; or, the first limiting part is a limiting step in the mounting hole, and the second limiting part is a snap spring; or, the first limiting part and the second limiting part are both snap springs.

5. The supporting device as claimed in claim 4, wherein a friction reducing gasket is disposed between the first retaining member and the resilient plate, and/or a friction reducing gasket is disposed between the second retaining member and the resilient plate.

6. The support device of claim 2, wherein the air floating structure further comprises a top foil arranged on one side of the elastic sheet facing the crankshaft, and the top foil is annular and can be deformed along the radial direction of the mounting hole to provide radial support force for the elastic sheet.

7. The supporting device as claimed in claim 6, wherein the top foil is provided with a top plate extending towards the inner wall of the mounting hole, and the inner wall of the mounting hole is provided with a positioning groove, and the top plate extends and is inserted into the positioning groove.

8. The support device of claim 7, wherein the top sheet is formed by bending the top foil tail.

9. The support device of claim 1, wherein the air bearing is an air bearing, the air bearing comprises a fixed ring and a plurality of foils, the inner surface of the fixed ring is formed with a plurality of fixing grooves recessed along the radial direction of the fixed ring, the foils have opposite first ends and second ends, the first ends are disposed in the fixing grooves, the distance between the foils and the inner surface of the fixed ring is gradually increased from the first ends to the second ends, and at least part of two adjacent foils are overlapped.

10. A compressor comprising a crankshaft and a support device according to any one of claims 1 to 9, said support device being mounted on said crankshaft.

Images