阅读说明：本技术 一种轴向自密封的轴封装置及压缩机 (Axial self-sealing shaft seal device and compressor ) 是由 陶林 谢虹 朴雨植 贾战峰 于 2019-11-20 设计创作，主要内容包括：本发明提供一种轴向自密封的轴封装置,包括主轴以及套设在主轴上的轴封和轴承座,所述轴封和轴承座与主轴之间形成背压腔；所述轴封包括容纳腔和外壳筒体,所述容纳腔的内壁上设有多个环形凹槽；所述轴封与主轴之间设有空腔,所述空腔由小环形空腔和大环形空腔交替构成；所述外壳筒体的外壁和底部与轴承座形成抵接面,所述背压腔承受压力时,压力作用在轴封上,进而传递到抵接面上,构成轴封和轴承座之间的接触密封。本发明还提供一种具有轴向自密封的轴封装置的压缩机。本发明结构简单,密封效果好,零泄漏,轴功率损失小,实现了轴封与主轴无接触的轴向自密封,适用于各种液态轴封的装置。(The invention provides an axial self-sealing shaft seal device, which comprises a main shaft, a shaft seal and a bearing seat, wherein the shaft seal and the bearing seat are sleeved on the main shaft; the shaft seal comprises an accommodating cavity and a shell barrel, and a plurality of annular grooves are formed in the inner wall of the accommodating cavity; a cavity is arranged between the shaft seal and the main shaft and consists of small annular cavities and large annular cavities alternately; the outer wall and the bottom of the shell barrel form abutting surfaces with the bearing seat, when the back pressure cavity bears pressure, the pressure acts on the shaft seal and is further transmitted to the abutting surfaces, and contact sealing between the shaft seal and the bearing seat is formed. The invention also provides a compressor with the axial self-sealing shaft seal device. The invention has simple structure, good sealing effect, zero leakage and small shaft power loss, realizes the non-contact axial self-sealing of the shaft seal and the main shaft, and is suitable for various liquid shaft seal devices.)

1. The axial self-sealing shaft seal device is characterized by comprising a main shaft (1), a shaft seal (2) and a bearing seat (3), wherein the shaft seal (2) and the bearing seat (3) are sleeved on the main shaft (1), the bearing seat (3) is used for clamping the shaft seal (2) on the main shaft (1), the end surface of an inner cavity of the bearing seat (3) is flush with the upper end surface of the shaft seal (2), and a back pressure cavity (4) is formed between the shaft seal (2) and the main shaft (1) and between the bearing seat (3) and the main shaft (1); the shaft seal (2) comprises an accommodating cavity (21) and a shell barrel (22), and a plurality of annular grooves (23) are formed in the inner wall of the accommodating cavity (21); a cavity is arranged between the shaft seal (2) and the main shaft (1), the cavity is formed by small annular cavities (5) and large annular cavities (6) in an alternating mode, the large annular cavity (6) is formed by an annular groove (23) and the outer wall of the main shaft (1), and the small annular cavity (5) is formed by the inner wall of the accommodating cavity (21) except the annular groove (23) and the outer wall of the main shaft (1); the outer wall and the bottom of the shell barrel (22) and the bearing seat (3) form a butt joint surface (7), when the back pressure cavity (4) bears pressure, the pressure acts on the shaft seal (2) and is further transmitted to the butt joint surface (7), and contact sealing between the shaft seal (2) and the bearing seat (3) is formed.

2. The axial self-sealing shaft seal device according to claim 1, characterized in that the shaft seal (2) is of a large-top structure and a small-bottom structure, and an abutting surface (7) formed by the outer wall of the housing cylinder (22) and the bearing seat (3) is arranged obliquely from top to bottom toward the main shaft (1).

3. The axial self-sealing shaft seal device according to claim 1, characterized in that the upper end face of the shaft seal (2) is further provided with a groove (24), the groove (24) is formed between the outer wall of the accommodating cavity (21) and the inner wall of the housing cylinder (22), and the open end of the groove (24) faces the back pressure cavity (4).

4. Axial self-sealing shaft seal arrangement according to claim 1, characterized in that there are at least 2 of said annular grooves (23).

5. Axial self-sealing shaft seal arrangement according to claim 1, characterized in that the width of the large annular cavity (6) is larger than the width of the small annular cavity (5).

6. Axial self-sealing shaft seal arrangement according to claim 1, characterized in that the width of the large annular cavity (6) is 10 times the width of the small annular cavity (5).

7. Axial self-sealing shaft seal arrangement according to claim 1, characterized in that the main shaft (1) is clearance fitted with the shaft seal (2) and the main shaft (1) is clearance fitted with the bearing seat (3).

8. The axial self-sealing shaft seal arrangement according to claim 1, characterized in that the shaft seal (2) is made of polytetrafluoroethylene or polyetheretherketone material.

9. The axial self-sealing shaft seal device according to claim 1, characterized in that the bearing seat (3) is provided with a receiving groove for receiving the shaft seal (2) at the upper part of the receiving cavity of the main shaft (1), and the receiving groove is sealed with the outer wall and the bottom of the outer shell cylinder (22) in a matching way.

10. A compressor, characterized in that a shaft seal device comprising the axial self-sealing as claimed in any one of claims 1 to 9 is provided on a back pressure surface of an orbiting scroll.

Technical Field

The invention relates to the field of compressors, in particular to an axial self-sealing shaft seal device.

Background

In the design of an electric scroll compressor, in consideration of axial adjustment of a gap between a movable scroll and a fixed scroll, a back pressure surface is often required to be designed on the back surface of the movable scroll, so that a sealing cavity is required to be formed between the movable scroll and a bearing seat; because the bearing seat and the main shaft rotate relatively, a shaft seal is needed for sealing; and in the market, standard shaft sealing parts are generally in over-hard fit with a main shaft, so that the power loss of the shaft is large. The general improvement is to increase shaft power by improving the self-lubricity of the material, but this increases the production cost of the standard shaft seal.

Disclosure of Invention

The invention aims to provide an axial self-sealing shaft seal device aiming at the defects in the prior art, the shaft seal device is simple in structure, good in sealing effect, zero in leakage and small in shaft power loss, realizes non-contact axial self-sealing of a shaft seal and a main shaft, and is suitable for various liquid shaft seal devices.

According to one aspect of the invention, an axial self-sealing shaft seal device is provided, which comprises a main shaft (1), a shaft seal (2) and a bearing seat (3) which are sleeved on the main shaft (1), wherein the shaft seal (2) is sleeved on the main shaft (1) by the bearing seat (3), the end surface of the inner cavity of the bearing seat (3) is flush with the upper end surface of the shaft seal (2), and a back pressure cavity (4) is formed between the main shaft (1) and the shaft seal (2) and the bearing seat (3); the shaft seal (2) comprises an accommodating cavity (21) and a shell barrel (22), and a plurality of annular grooves (23) are formed in the inner wall of the accommodating cavity (21); a cavity is arranged between the shaft seal (2) and the main shaft (1), the cavity is formed by small annular cavities (5) and large annular cavities (6) in an alternating mode, the large annular cavity (6) is formed by an annular groove (23) and the outer wall of the main shaft (1), and the small annular cavity (5) is formed by the inner wall of the accommodating cavity (21) except the annular groove (23) and the outer wall of the main shaft (1); the outer wall and the bottom of the shell barrel (22) and the bearing seat (3) form a butt joint surface (7), when the back pressure cavity (4) bears pressure, the pressure acts on the shaft seal (2) and is further transmitted to the butt joint surface (7), and contact sealing between the shaft seal (2) and the bearing seat (3) is formed.

Preferably, the shaft seal (2) is of a structure with a large upper part and a small lower part, and an abutting surface (7) formed by the outer wall of the shell cylinder (22) and the bearing seat (3) is obliquely arranged from top to bottom towards the main shaft (1). The shaft seal (2) is of a structure with a large upper part and a small lower part, so that a pressure angle is formed, and the pressure sealing performance formed by the shaft seal and the bearing seat is better.

Preferably, the upper end face of the shaft seal (2) is further provided with a groove (24), the groove (24) is formed between the outer wall of the accommodating cavity (21) and the inner wall of the shell cylinder (22), and the open end of the groove (24) faces the back pressure cavity (4). When the shaft seal is stressed by pressure, the groove is stressed to deform and enlarge towards the inner wall of the containing cavity and the outer wall of the shell barrel, so that the shaft seal is more attached to the bearing seat and the main shaft, and the sealing property is enhanced; simultaneously the bearing seal holds intracavity lateral wall and can receive the extrusion of external force and warp at the assembling process, sets up the deformation that the slot ability to a great extent buffering held the chamber lateral wall between the outer wall that holds the chamber and the inner wall of shell barrel to effectively prevented the bearing seal damage that the lateral wall leads to because of suffering extrusion deformation in the assembling process.

Preferably, at least 2 annular grooves (23) are provided. The quantity that the annular groove set up is according to the high determination of bearing frame, and the quantity that the annular groove set up is more, and sealed effect between bearing seal and the main shaft is stronger, more can realize the purpose that freezing oil is zero to reveal.

Preferably, the width of the large annular cavity (6) is larger than that of the small annular cavity (5). The widths of the large and small annular cavities are related to the structure and material of the shaft seal, the pressure to which the shaft seal is subjected, and the flow rate, and generally, the smaller the width of the small annular cavity is, the better the width of the large annular cavity is.

Preferably, the width of the large annular cavity (6) is 10 times the width of the small annular cavity (5).

Preferably, the annular groove (23) is any one of an inwards concave triangular groove, an arc-shaped groove, a square groove, a rectangular groove, a trapezoidal groove or a polygonal groove, when the inwards concave depths of the annular grooves are different, the maximum depth and the width of the small annular cavity are the maximum width of the large annular cavity when the annular grooves are inwards concave, the width of the large annular cavity is 10 times that of the small annular cavity, and the maximum width of the large annular cavity is 10 times that of the small annular cavity.

Preferably, the main shaft (1) is in clearance fit with the shaft seal (2), and the main shaft (1) is in clearance fit with the bearing seat (3).

Preferably, the shaft seal (2) is made of polytetrafluoroethylene or polyetheretherketone material. The bearing seat has elasticity, is deformed when being pressed and can cling to the bearing seat, thereby forming good sealing effect.

Preferably, the bearing seat (3) is sleeved on the upper part of the accommodating cavity of the main shaft (1) and is provided with an accommodating groove for accommodating the shaft seal (2), and the accommodating groove is matched and sealed with the outer wall and the bottom of the shell cylinder (22).

The second purpose of the present invention is to overcome the shortcomings of the prior art and to provide a compressor with good sealing performance. In order to achieve the above purpose, the invention is realized by the following technical scheme: the back pressure surface of the movable scroll disk of the compressor is provided with the shaft seal device which comprises the axial self-sealing.

Preferably, the main shaft (1) is in clearance fit with the shaft seal (2), and the main shaft (1) is in clearance fit with the bearing seat (3).

The working principle is as follows: the refrigeration oil in the back pressure cavity leaks into a cavity between the shaft seal and the main shaft under the action of pressure P; the refrigeration oil enters the large annular cavity after being throttled by the tiny inlet of the small annular cavity, the fluid forms strong vortex in the large annular cavity, so that the pressure is reduced from the initial pressure P to P1, the refrigeration oil is subjected to the alternate change of the next small annular cavity and the large annular cavity, the pressure is further reduced from P1 to P2, the leakage speed of the refrigeration oil almost completely disappears, and the sealing effect is achieved.

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

(1) the axial self-sealing shaft seal device has good sealing effect, zero leakage and small shaft power loss, realizes the non-contact axial self-sealing of the shaft seal and the main shaft, and is suitable for various liquid shaft seal devices;

(2) according to the axial self-sealing shaft seal device, the shaft seal is of a structure with a large upper part and a small lower part, so that a pressure angle is formed, and the pressure sealing performance formed by the shaft seal and the bearing seat is better;

(3) according to the axial self-sealing shaft seal device, the groove is formed in the shaft seal, so that the sealing effect between the shaft seal and the bearing seat and between the shaft seal and the main shaft is stronger, meanwhile, the side wall of the accommodating cavity can deform under the extrusion of external force in the assembling process of the shaft seal, and the groove is formed between the outer wall of the accommodating cavity and the inner wall of the shell barrel, so that the deformation of the side wall of the accommodating cavity can be greatly buffered, and the damage of the side wall of the shaft seal caused by extrusion deformation in the assembling process can be effectively prevented;

(4) the axial self-sealing shaft seal device has the advantages of simple structure, ingenious design and remarkable effect;

(5) the axial self-sealing shaft seal device has the advantages of long service life, easiness in processing and assembling, simple manufacturing process, batch production, low cost, strong practicability and suitability for large-scale popularization;

(6) the compressor with the axial self-sealing shaft seal device, disclosed by the invention, has the advantages that the shaft seal is in clearance fit with the main shaft, and the problems of large shaft power loss, high price and the like caused by the fact that the shaft seal is in over-hard fit in a common compressor are solved.

Drawings

Other features, objects and advantages of the invention will become more apparent upon reading of the detailed description of non-limiting embodiments with reference to the following drawings:

FIG. 1 is a schematic structural view of an axially self-sealing shaft seal assembly of the present invention;

FIG. 2 is an enlarged view of a portion of the axial self-sealing shaft seal assembly of the present invention;

FIG. 3 is a first schematic view of the shaft seal of the present invention;

FIG. 4 is a schematic structural view of the shaft seal of the present invention;

fig. 5 is a schematic sectional view of the structure of the shaft seal of the present invention.

Detailed Description

The present invention will be described in detail with reference to specific examples. The following examples will assist those skilled in the art in further understanding the invention, but are not intended to limit the invention in any way. It should be noted that variations and modifications can be made by persons skilled in the art without departing from the spirit of the invention. All falling within the scope of the present invention.