阅读说明：本技术 一种带注液槽和凹槽结构的中管以及装入滚珠轴承的工艺 (Middle pipe with liquid injection groove and groove structure and process for installing ball bearing ) 是由 贾自周 于 2020-12-30 设计创作，主要内容包括：本发明公开了一种带注液槽和凹槽结构的中管,包括中管,所述中管装设在静叶轮毂内部,所述中管一端通过粘结剂粘结固定装设有第一滚珠轴承,另一端通过粘结剂粘结固定装设有第二滚珠轴承,所述中管一端设有第一径向支撑圆环面,另一端设有第二径向支撑圆环面,所述第一径向支撑圆环面设有第一凹槽,所述第一径向支撑圆环面还设有第一注液槽,所述第一注液槽连接第一凹槽,所述第二径向支撑圆环面设有第二凹槽,所述第二径向支撑圆环面还设有第二注液槽,所述第二注液槽连接第二凹槽,本发明改善了滚珠轴承的受力,增加轴承寿命,保证了滚珠轴承和中管的同心度,降低了粘接剂注入的工艺难度。(The invention discloses a middle pipe with a liquid injection groove and groove structure, which comprises a middle pipe, wherein the middle pipe is arranged in a static impeller hub, one end of the middle pipe is fixedly provided with a first ball bearing through bonding agent, the other end of the middle pipe is fixedly provided with a second ball bearing through bonding agent, one end of the middle pipe is provided with a first radial support circular ring, the other end of the middle pipe is provided with a second radial support circular ring, the first radial support circular ring is provided with a first groove, the first radial support circular ring is also provided with a first liquid injection groove, the first liquid injection groove is connected with the first groove, the second radial support circular ring is provided with a second groove, the second radial support circular ring is also provided with a second liquid injection groove, and the second liquid injection groove is connected with the second groove. The process difficulty of adhesive injection is reduced.)

1. The middle pipe with the liquid injection groove and the groove structure is characterized by comprising a middle pipe (3), wherein the middle pipe (3) is arranged inside a static impeller hub (1), one end of the middle pipe (3) is fixedly provided with a first ball bearing (41) through bonding agent bonding, the other end of the middle pipe is fixedly provided with a second ball bearing (42) through bonding agent bonding, one end of the middle pipe (3) is provided with a first radial supporting circular ring surface (32), the other end of the middle pipe is provided with a second radial supporting circular ring surface (34), the first radial supporting circular ring surface (32) is provided with a first groove, the first radial supporting circular ring surface (32) is further provided with a first liquid injection groove (71), the first liquid injection groove (71) is connected with the first groove, the second radial supporting circular ring surface (34) is provided with a second groove, the second radial supporting circular ring surface (34) is further provided with a second liquid injection groove (72), the second liquid injection groove (72) is connected with the second groove.

2. The middle pipe with the structure of the liquid injection groove and the groove as claimed in claim 1, wherein the impeller hub (1) is installed inside the outer frame (2), one end of the middle pipe (3) is further provided with a first axial supporting ring end surface (31), the other end of the middle pipe is further provided with a second axial supporting ring end surface (33), one end of the first liquid injection groove (71) is connected with the end of the middle pipe (3), the other end of the first liquid injection groove is connected with the first groove, one end of the second liquid injection groove (72) is connected with the end of the middle pipe (3), and the other end of the second liquid injection groove is connected with the second groove.

3. The middle pipe with the liquid injection groove and groove structure as claimed in claim 2, wherein the first groove is a first annular groove (61), the first annular groove (61) is located in the middle of the first ball bearing (41), one end of the first liquid injection groove (71) is connected with the end of the middle pipe (3), and the other end is connected with the upper end of the first annular groove (61); the second groove is a second annular groove (62), the second annular groove (62) is located in the middle of the second ball bearing (42), one end of the second liquid injection groove (72) is connected with the end of the middle pipe (3), and the other end of the second liquid injection groove is connected with the upper end of the second annular groove (62).

4. The middle pipe with the liquid injection groove and the groove structure as claimed in claim 2, wherein the first groove is a first spiral groove (81), the first spiral groove (81) is spirally wound around the first ball bearing (41), the axial height of the first spiral groove (81) is less than or equal to the height of the first ball bearing (41), one end of the first liquid injection groove (71) is connected with the end of the middle pipe (3), and the other end is connected with the upper end of the first spiral groove (81); the second groove is a second spiral groove (82), the second spiral groove (82) spirally surrounds the second ball bearing (42), the axial height of the second spiral groove (82) is smaller than or equal to the height of the second ball bearing (42), one end of the second liquid injection groove (72) is connected with the end part of the middle pipe (3), and the other end of the second liquid injection groove is connected with the upper end of the second spiral groove (82).

5. The middle tube with liquid injection groove and groove structure as claimed in claim 3, wherein a first open communication chamber for containing the adhesive is formed among the first annular groove (61), the first ball bearing (41), the first liquid injection groove (71) and the middle tube (3); and a second open communication chamber for containing the adhesive is formed among the second annular groove (62), the second ball bearing (42), the second liquid injection groove (72) and the middle pipe (3).

6. The middle tube with liquid injection groove and groove structure as claimed in claim 4, wherein a first open type communicating spiral chamber for containing the adhesive is formed among the first spiral groove (81), the first ball bearing (41), the first liquid injection groove (71) and the middle tube (3); and a second open type communication spiral chamber for containing the adhesive is formed among the second spiral groove (82), the second ball bearing (42), the second liquid injection groove (72) and the middle pipe (3).

7. A process for assembling a middle tube-in-ball bearing with a liquid injection groove and groove structure as claimed in any one of claims 1 to 6, which comprises the following steps:

step S1: placing the bottom surface of the outer frame (2) downwards, and installing a first ball bearing (41) into the inner part of one end of the middle pipe (3);

step S2: the liquid injection nozzle extends into the first liquid injection groove (71), the adhesive is injected or flows into the first annular groove (61) or the first spiral groove (81) along the first liquid injection groove (71), the adhesive is kept stand for a period of time to fully flow into the space between the first ball bearing (41) and the middle pipe (3), and the adhesive is preliminarily solidified between the first ball bearing (41) and the middle pipe (3) so as to preliminarily fix the first ball bearing (41);

step S3: turning over the outer frame (2), placing the bottom surface of the outer frame (2) upwards, and installing the second ball bearing (42) into the inner part of the other end of the middle pipe (3);

step S4: the liquid injection nozzle extends into the second liquid injection groove (72), the adhesive is injected or flows into the second annular groove (62) or the second spiral groove (82) along the second liquid injection groove (72), the adhesive is kept stand for a period of time to fully flow into the space between the second ball bearing (42) and the middle pipe (3), and the adhesive is preliminarily solidified between the second ball bearing (42) and the middle pipe (3) so as to preliminarily fix the second ball bearing (42);

step S5: and standing for a period of time to solidify the adhesive among the first ball bearing (41), the second ball bearing (42) and the middle pipe (3), wherein the first ball bearing (41) and the second ball bearing (42) are assembled.

8. The process for installing a middle tube into a ball bearing with a liquid injection groove and groove structure as claimed in claim 7, wherein in step S1, a first open communication chamber for containing the adhesive is formed among the first annular groove (61), the first ball bearing (41), the first liquid injection groove (71) and the middle tube (3); or a first open type communication spiral chamber for containing the adhesive is formed among the first spiral groove (81), the first ball bearing (41), the first liquid injection groove (71) and the middle pipe (3).

9. The process for assembling a middle tube with a liquid injection groove and groove structure into a ball bearing according to claim 7, wherein in the step S3, a second open communication chamber for containing the adhesive is formed among the second annular groove (62), the second ball bearing (42), the second liquid injection groove (72) and the middle tube (3); or a second open type communication spiral chamber for containing the adhesive is formed among the second spiral groove (82), the second ball bearing (42), the second liquid injection groove (72) and the middle pipe (3).

10. The process of claim 7, wherein in step S4, the outer frame (2) is turned over again, the upper end of the static impeller hub (1) is provided with a spring and rotor assembly, the lower end is provided with a retaining ring, the first ball bearing (41) and the second ball bearing (42) are aligned and positioned by the concentricity of the shaft core of the rotor assembly, the first ball bearing (41) is axially positioned by the spring, and the second ball bearing (42) is axially positioned by the retaining ring.

Technical Field

The invention relates to the technical field of fan middle tube structure improvement, in particular to a middle tube with a liquid injection groove and a groove structure and a process for installing a ball bearing.

Background

At present, the size of an electronic equipment system is gradually reduced, the heat dissipation fan needs to provide the highest heat dissipation performance in a limited installation space to meet the market demand, so that the industry has more and more demands on high-speed fans, and in order to reduce the overall vibration and ensure the service life of the high-speed fans, the high-speed fans generally adopt an assembly process of fixing a ball bearing outer ring and a middle pipe.

At present, two fixing methods are generally adopted for fixing a middle pipe and a ball bearing outer ring of a high-speed fan: firstly, adopting adhesive to bond and fix; secondly, the fixing is carried out in an interference fit mode. The process of bonding and fixing by using the adhesive comprises the steps of firstly coating a layer of adhesive on the inner surface of the middle pipe, then installing the ball bearing in the middle pipe, and fixing the ball bearing in the middle pipe by using the adhesive. The assembly process adopting the interference fit has the advantages that firstly, the interference fit needs more production equipment, the assembly is more complex, the production cost is higher, then the concentricity of the upper ball bearing and the lower ball bearing after the assembly is greatly influenced by the middle pipe, and the concentricity is difficult to guarantee.

The assembly process of the two structures cannot meet the fixing requirement of the market on the ball bearing in the high-speed fan.

Disclosure of Invention

The invention aims to overcome the defects in the prior art, provides the middle pipe with the liquid injection groove and the groove structure and the process for installing the ball bearing, improves the stress uniformity of the ball bearing, improves the stress of the ball bearing, prolongs the service life of the bearing, ensures the concentricity of the ball bearing and the middle pipe, avoids the possibility that an adhesive passes through a dustproof cover of the ball bearing and enters the ball bearing, reduces the failure caused by the adhesive entering the ball bearing, improves the yield of products, prolongs the service life of a fan, and simplifies the fixing process of the ball bearing and the middle pipe.

In order to achieve the purpose, the invention provides a middle pipe with a liquid injection groove and a groove structure, which comprises a middle pipe and a middle pipe, wherein the middle pipe is arranged in a static impeller hub, one end of the middle pipe is fixedly provided with a first ball bearing through bonding of an adhesive, the other end of the middle pipe is fixedly provided with a second ball bearing through bonding of an adhesive, one end of the middle pipe is provided with a first radial supporting circular ring surface, the other end of the middle pipe is provided with a second radial supporting circular ring surface, the first radial supporting circular ring surface is provided with a first groove, the first liquid injection groove is connected with the first groove, the second radial supporting circular ring surface is provided with a second groove, the second radial supporting circular ring surface is further provided with a second liquid injection groove, and the second liquid injection groove is connected with the second groove.

Preferably, the stator vane wheel hub is arranged inside the outer frame, one end of the middle pipe is further provided with a first axial supporting ring end face, the other end of the middle pipe is further provided with a second axial supporting ring end face, one end of the first liquid injection groove is connected with the end portion of the middle pipe, the other end of the first liquid injection groove is connected with the first groove, one end of the second liquid injection groove is connected with the end portion of the middle pipe, and the other end of the second liquid injection groove is connected with.

Preferably, the first groove is a first annular groove, the first annular groove is positioned in the middle of the first ball bearing, one end of the first liquid injection groove is connected with the end part of the middle pipe, and the other end of the first liquid injection groove is connected with the upper end of the first annular groove; the second groove is a second annular groove which is located in the middle of the second ball bearing, one end of the second liquid injection groove is connected with the end portion of the middle pipe, and the other end of the second liquid injection groove is connected with the upper end of the second annular groove.

Preferably, the first groove is a first spiral groove, the first spiral groove spirally surrounds the first ball bearing, the axial height of the first spiral groove is smaller than or equal to the height of the first ball bearing, one end of the first liquid injection groove is connected with the end part of the middle pipe, and the other end of the first liquid injection groove is connected with the upper end of the first spiral groove; the second groove is a second spiral groove, the second spiral groove is spirally wound around the second ball bearing, the axial height of the second spiral groove is smaller than or equal to the height of the second ball bearing, one end of the second liquid injection groove is connected with the end part of the middle pipe, and the other end of the second liquid injection groove is connected with the upper end of the second spiral groove.

Preferably, a first open communication chamber for containing the adhesive is formed among the first annular groove, the first ball bearing, the first liquid injection groove and the middle pipe; and a second open type communication chamber for containing the bonding agent is formed among the second annular groove, the second ball bearing, the second liquid injection groove and the middle pipe.

Preferably, a first open type communication spiral chamber for containing the adhesive is formed among the first spiral groove, the first ball bearing, the first liquid injection groove and the middle pipe; and a second open type communication spiral chamber for containing the adhesive is formed among the second spiral groove, the second ball bearing, the second liquid injection groove and the middle pipe.

The invention also provides a process for assembling the ball bearing with the middle pipe provided with the liquid injection groove and the groove structure, which comprises the following steps:

step S1: placing the bottom surface of the outer frame downwards, and installing a first ball bearing into the inner part of one end of the middle pipe;

step S2: the liquid injection nozzle extends into the first liquid injection groove, the adhesive is injected or flows into the first annular groove or the first spiral groove along the first liquid injection groove, the adhesive is kept stand for a period of time to fully flow into the space between the first ball bearing and the middle pipe, and the adhesive is preliminarily solidified between the first ball bearing and the middle pipe so as to preliminarily fix the first ball bearing;

step S3: turning over the outer frame, placing the bottom surface of the outer frame upwards, and installing a second ball bearing into the other end of the middle pipe;

step S4: the liquid injection nozzle extends into the second liquid injection groove, the adhesive is injected into or flows into the second annular groove or the second spiral groove along the second liquid injection groove, the adhesive is kept stand for a period of time to fully flow into the space between the second ball bearing and the middle pipe, and the adhesive is preliminarily solidified between the second ball bearing and the middle pipe so as to preliminarily fix the second ball bearing;

step S5: and standing for a period of time to enable the adhesive to be solidified among the first ball bearing, the second ball bearing and the middle pipe, wherein the first ball bearing and the second ball bearing are assembled completely.

Preferably, in the step S1, a first open communication chamber for accommodating the adhesive is formed among the first annular groove, the first ball bearing, the first liquid injection groove and the middle pipe; or a first open type communication spiral chamber for containing the adhesive is formed among the first spiral groove, the first ball bearing, the first liquid injection groove and the middle pipe.

Preferably, in the step S3, a second open communication chamber for accommodating the adhesive is formed among the second annular groove, the second ball bearing, the second liquid injection groove and the middle pipe; or a second open type communication spiral chamber for containing the adhesive is formed among the second spiral groove, the second ball bearing, the second liquid injection groove and the middle pipe.

Preferably, in step S4, the outer frame is turned over again, the spring and the rotor assembly are mounted on the upper end of the stator vane hub, the retaining ring is mounted on the lower end of the stator vane hub, the concentricity of the first ball bearing and the second ball bearing is corrected and positioned by the shaft core of the rotor assembly, the first ball bearing is axially positioned by the spring, and the second ball bearing is axially positioned by the retaining ring.

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

1. the first annular groove is positioned in the middle of the first ball bearing, and divides the first radial supporting circular ring surface into two parts, and the two parts of circular ring supporting surfaces together radially support the first ball bearing, so that the first ball bearing can be supported more uniformly, the stress uniformity of the first ball bearing is improved, the stress of the first ball bearing is improved, the service life of the first ball bearing is prolonged, and the concentricity of the first ball bearing and the middle pipe is ensured;

the second annular groove is located in the middle of the second ball bearing and divides the second radial supporting circular ring into two parts, the two parts of circular ring supporting surfaces radially support the second ball bearing together, more balanced support can be provided for the second ball bearing, the stress uniformity of the second ball bearing is improved, the stress of the second ball bearing is improved, the service life of the second ball bearing is prolonged, and the concentricity of the second ball bearing and the middle pipe is ensured.

2. The first spiral groove spirally surrounds the first ball bearing, the first radial supporting ring surface is divided into continuous supporting surfaces, the continuous supporting surfaces radially support the first ball bearing together, more balanced support can be provided for the first ball bearing, the stress uniformity of the first ball bearing is improved, the stress of the first ball bearing is further improved, the service life of the first ball bearing is prolonged, and the concentricity of the first ball bearing and the middle pipe is ensured;

the second spiral groove is spirally wound around the second ball bearing, and divides the second radial support circular ring into a continuous support surface, the continuous support surface is used for radially supporting the second ball bearing together, more balanced support can be provided for the second ball bearing, the stress uniformity of the second ball bearing is improved, the stress of the second ball bearing is further improved, the service life of the second ball bearing is prolonged, and the concentricity of the second ball bearing and the middle pipe is ensured.

3. According to the invention, the liquid injection grooves are arranged at the tail ends of the first annular groove, the second annular groove, the first spiral groove and the second spiral groove, and the adhesive is injected along the liquid injection grooves, so that the possibility that the adhesive penetrates through the dustproof cover of the ball bearing and enters the ball bearing is avoided, the failure caused by the adhesive entering the ball bearing is reduced, the product yield is improved, the service life of the fan is prolonged, and the fixing process of the ball bearing and the middle pipe is simplified.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.

FIG. 1 is a schematic cross-sectional view of a middle tube with a liquid injection groove and a groove structure according to a first embodiment of the present invention;

FIG. 2 is an enlarged schematic view of I in FIG. 1;

FIG. 3 is an enlarged schematic view of II of FIG. 1;

FIG. 4 is a schematic cross-sectional view of a middle tube with a liquid injection groove and a groove structure according to a second embodiment of the present invention;

FIG. 5 is an enlarged schematic view of III of FIG. 4;

FIG. 6 is an enlarged schematic view of IV in FIG. 4.

The figure includes:

1-static impeller hub, 2-outer frame, 3-middle tube, 41-first ball bearing, 42-second ball bearing, 31-first axial supporting ring end face, 32-first radial supporting ring face, 61-first annular groove, 71-first liquid injection groove, 33-second axial supporting ring end face, 34-second radial supporting ring face, 62-second annular groove, 72-second liquid injection groove, 81-first spiral groove and 82-second spiral groove.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is apparent that the described embodiments are one embodiment of the present invention, and not all embodiments of the present invention. All other embodiments obtained by a person skilled in the art based on the embodiments of the present invention without any creative work belong to the protection scope of the present invention.

Example one

Referring to fig. 1, a middle tube with a liquid injection groove and a groove structure according to an embodiment of the present invention includes a middle tube 3, the middle tube 3 is installed inside a static impeller hub 1, the static impeller hub 1 is installed inside an outer frame 2, one end of the middle tube 3 is fixedly provided with a first ball bearing 41 through adhesive bonding, the other end of the middle tube is fixedly provided with a second ball bearing 42 through adhesive bonding, and the first ball bearing 41 and the second ball bearing 42 are fixedly installed on the middle tube 3 through adhesive bonding.

A first axial supporting circular ring end face 31 and a first radial supporting circular ring face 32 are arranged at one end of the middle pipe 3, the first axial supporting circular ring end face 31 is used for axially supporting the first ball bearing 41, the first radial supporting circular ring face 32 is used for radially supporting the first ball bearing 41, a first groove is formed in the first radial supporting circular ring face 32, a first liquid injection groove 71 is further formed in the first radial supporting circular ring face 32, one end of the first liquid injection groove 71 is connected with the end portion of the middle pipe 3, and the other end of the first liquid injection groove 71 is connected with the first groove;

the well 3 other end of pipe is equipped with second axial support ring terminal surface 33 and second radial support ring surface 34, second axial support ring terminal surface 33 is second ball bearing 42 axial support, second radial support ring surface 34 is second ball bearing 42 radial support, second radial support ring surface 34 is equipped with the second recess, second radial support ring surface 34 still is equipped with second notes cistern 72, well 3 tip in the connection of second notes cistern 72 one end, the second recess is connected to the other end.

As shown in fig. 1 and 2, the first groove is a first annular groove 61, the first annular groove 61 is located in the middle of the first ball bearing 41, the first liquid injection groove 71 is a vertical groove, one end of the first liquid injection groove 71 is connected to the end of the middle pipe 3, the other end of the first liquid injection groove is connected to the upper end of the first annular groove 61, the first annular groove 61 is located in the middle of the first ball bearing 41, and divides the first radial support circular surface 32 into two parts, the two parts of circular support surfaces radially support the first ball bearing 41 together, so that the first ball bearing 41 can be supported more uniformly, the stress uniformity of the first ball bearing 41 is improved, the stress of the first ball bearing 41 is improved, the service life of the first ball bearing 41 is increased, and the concentricity of the first ball bearing 41 and the middle pipe 3 is ensured.

Mounting manner of the first ball bearing 41: firstly, the first ball bearing 41 is arranged in one end of the middle pipe 3, and the first annular groove 61 is positioned in the middle of the first ball bearing 41, so that the first annular groove 61 cannot be observed after the first ball bearing 41 is arranged, and only the first liquid injection groove 71 can be seen; next, the adhesive is injected or flowed into the first annular groove 61 along the first liquid injection groove 71; again, the adhesive automatically flows into between the first ball bearing 41 and the center tube 3; finally, the adhesive is left for a period of time to solidify between the first ball bearing 41 and the center tube 3, and the first ball bearing 41 is assembled.

As shown in fig. 1 and 3, the second groove is a second annular groove 62, the second annular groove 62 is located in the middle of the second ball bearing 42, the second liquid injection groove 72 is a vertical groove, one end of the second liquid injection groove 72 is connected to the end of the middle pipe 3, the other end of the second liquid injection groove 72 is connected to the upper end of the second annular groove 62, the second annular groove 62 is located in the middle of the second ball bearing 42 and divides the second radial support circular ring surface 34 into two parts, and the two parts of circular ring support surfaces radially support the second ball bearing 42 together, so that the second ball bearing 42 can be supported more uniformly, the stress uniformity of the second ball bearing 42 is improved, the stress of the second ball bearing 42 is improved, the service life of the second ball bearing 42 is prolonged, and the concentricity of the second ball bearing 42 and the middle pipe 3 is ensured.

Mounting manner of the second ball bearing 42: firstly, after the first ball bearing 41 is installed, the outer frame 2 is turned over, the second ball bearing 42 is installed in the inner part of the other end of the middle pipe 3, and the second annular groove 62 is positioned in the middle of the second ball bearing 42, so that the second annular groove 62 cannot be observed after the second ball bearing 42 is installed, and only the second liquid injection groove 72 can be seen; next, the adhesive is injected or flowed into the interior of the second annular groove 62 along the second liquid injection groove 72; again, the adhesive automatically flows into between the second ball bearing 42 and the center tube 3; finally, the adhesive is left for a period of time to solidify between the second ball bearing 42 and the center tube 3, and the second ball bearing 42 is assembled.

A first open communication chamber for containing the adhesive is formed among the first annular groove 61, the first ball bearing 41, the first liquid injection groove 71 and the middle pipe 3; second open intercommunication cavity that is used for holding the binder has been formed between second annular groove 62, second ball bearing 42, second notes cistern 72 and the well pipe 3, and the binder is realized comparatively simply at first open intercommunication cavity and the open intercommunication cavity evenly distributed's of second technology, is favorable to reducing manufacturing cost and the degree of difficulty that reduces assembly process, can reduce manufacturing cost, is favorable to improving the bonding effect of first ball bearing 41 and second ball bearing 42 and well pipe 3 simultaneously.

The groove cross-sectional profiles of the first annular groove 61, the first liquid-filling groove 71, the second annular groove 62 and the second liquid-filling groove 72 may be polygonal, for example: the shape of the triangle, the square, the rectangle, etc., may also be a semicircle or a semi-ellipse, which may be selected according to the actual situation, and is not limited in this embodiment.

Example two

Referring to fig. 4, a second embodiment of the present invention provides a middle tube with a liquid injection groove and a groove structure, which is different from the first embodiment in that: only the first annular groove 61 and the second annular groove 62 are changed to the first spiral groove 81 and the second spiral groove 82, and only the shape of the grooves for accommodating the adhesive is changed, so that the force uniformity of the first ball bearing 41 and the second ball bearing 42 is further improved.

As shown in fig. 4 and 5, the first groove is a first spiral groove 81, the first spiral groove 81 is spirally wound around the first ball bearing 41, the axial height of the first spiral groove 81 is less than or equal to the height of the first ball bearing 41, the first radial support circular ring surface 32 is further provided with a first liquid injection groove 71, the first liquid injection groove 71 is a vertical groove, one end of the first liquid injection groove 71 is connected with the end of the middle pipe 3, the other end is connected with the upper end of the first spiral groove 81, the first spiral groove 81 is spirally wound around the first ball bearing 41 and divides the first radial support circular ring surface 32 into continuous support surfaces, the continuous support surfaces together radially support the first ball bearing 41, so as to provide more balanced support for the first ball bearing 41, improve the uniformity of the stress of the first ball bearing 41, and further improve the stress of the first ball bearing 41, the life of the first ball bearing 41 is increased, and the concentricity of the first ball bearing 41 and the center tube 3 is ensured.

Mounting manner of the first ball bearing 41: firstly, the first ball bearing 41 is arranged in one end of the middle pipe 3, and the axial height of the first spiral groove 81 is less than or equal to the height of the first ball bearing 41, so that the first spiral groove 81 can not be observed after the first ball bearing 41 is arranged, and only the first liquid injection groove 71 can be seen; next, the adhesive is injected or flowed into the interior of the first spiral groove 81 along the first liquid injection groove 71; again, the adhesive automatically flows into between the first ball bearing 41 and the center tube 3; finally, the adhesive is left for a period of time to solidify between the first ball bearing 41 and the center tube 3, and the first ball bearing 41 is assembled.

As shown in fig. 4 and 6, the second spiral groove 82 is formed by spirally winding the second spiral groove 82 around the second ball bearing 42, the axial height of the second spiral groove 82 is less than or equal to the height of the second ball bearing 42, the second radial support circular ring surface 34 is further provided with a second liquid injection groove 72, the second liquid injection groove 72 is a vertical groove, one end of the second liquid injection groove 72 is connected with the end of the middle pipe 3, the other end of the second liquid injection groove 72 is connected with the upper end of the second spiral groove 82, the second spiral groove 82 is spirally wound around the second ball bearing 42 and divides the second radial support circular ring surface 34 into continuous support surfaces, the continuous support surfaces jointly radially support the second ball bearing 42, so as to provide more balanced support for the second ball bearing 42, improve the stress uniformity of the second ball bearing 42 and further improve the stress of the second ball bearing 42, the life of the second ball bearing 42 is increased, and the concentricity of the second ball bearing 42 and the center pipe 3 is ensured.

Mounting manner of the second ball bearing 42: firstly, after the first ball bearing 41 is installed, the outer frame 2 is turned over, the second ball bearing 42 is installed in the other end of the middle pipe 3, and the second spiral groove 82 can not be observed after the second ball bearing 42 is installed because the axial height of the second spiral groove 82 is less than or equal to the height of the second ball bearing 42, and only the second liquid injection groove 72 can be seen; next, the adhesive is injected or flowed into the interior of the second spiral groove 82 along the second liquid injection groove 72; again, the adhesive automatically flows into between the second ball bearing 42 and the center tube 3; finally, the adhesive is left for a period of time to solidify between the second ball bearing 42 and the center tube 3, and the second ball bearing 42 is assembled.

A first open communication spiral chamber for containing the adhesive is formed among the first spiral groove 81, the first ball bearing 41, the first liquid injection groove 71 and the middle pipe 3; second spiral groove 82, second ball bearing 42, second notes cistern 72 and well pipe 3 between form the open intercommunication spiral cavity of second that is used for holding the binder, first open intercommunication spiral cavity and the open intercommunication spiral cavity of second are all the intercommunication formula cavity, and the technology of binder evenly distributed in the cavity realizes comparatively simply, is favorable to reducing manufacturing cost and the degree of difficulty that reduces assembly process, can reduce manufacturing cost, is favorable to improving the bonding effect of first ball bearing 41 and second ball bearing 42 and well pipe 3 simultaneously.

The groove cross-sectional profiles of the first spiral groove 81, the second spiral groove 82, the first liquid-filling groove 71 and the second liquid-filling groove 72 may be polygonal, for example: the shape of the triangle, the square, the rectangle, etc., may also be a semicircle or a semi-ellipse, which may be selected according to the actual situation, and is not limited in this embodiment.

EXAMPLE III

The third embodiment of the invention provides a process for assembling the ball bearing with the middle pipe provided with the liquid injection groove and the groove structure, which comprises the following steps:

step S1: placing the bottom surface of the outer frame 2 downwards, and installing the first ball bearing 41 into one end of the middle pipe 3, wherein a first open type communication chamber for containing the adhesive is formed among the first annular groove 61, the first ball bearing 41, the first liquid injection groove 71 and the middle pipe 3;

or a first open communication spiral chamber for containing the adhesive is formed among the first spiral groove 81, the first ball bearing 41, the first liquid injection groove 71 and the intermediate pipe 3.

Step S2: the liquid injection nozzle extends into the first liquid injection groove 71, the adhesive is injected or flows into the first annular groove 61 or the first spiral groove 81 along the first liquid injection groove 71, the adhesive is enabled to fully flow into the space between the first ball bearing 41 and the middle pipe 3 after standing for a period of time, and meanwhile, the adhesive is preliminarily solidified between the first ball bearing 41 and the middle pipe 3, so that the first ball bearing 41 is preliminarily fixed.

Step S3: the outer frame 2 is turned over, the bottom surface of the outer frame 2 is placed upwards, the second ball bearing 42 is arranged in the other end of the middle pipe 3, and further, a second open type communication chamber for containing the adhesive is formed among the second annular groove 62, the second ball bearing 42, the second liquid injection groove 72 and the middle pipe 3;

or a second open communication spiral chamber for containing the adhesive is formed among the second spiral groove 82, the second ball bearing 42, the second liquid injection groove 72 and the middle pipe 3.

Step S4: stretch into to second notes liquid groove 72 in with annotating the liquid mouth, it injects or flows into second annular groove 62 or second spiral groove 82 inside along second notes liquid groove 72 to annotate the binder, it makes the binder fully flow into between second ball bearing 42 and the well pipe 3 to stew for a period of time, the binder simultaneously carries out preliminary solidification between second ball bearing 42 and well pipe 3, so that carry out preliminary fixed to second ball bearing 42, it is further again, overturn frame 2 again, pack into spring and rotor assembly in stationary vane wheel hub 1 upper end, the buckle is packed into to the lower extreme, utilize the axle core of rotor assembly to carry out concentricity correction and location to first ball bearing 41 and second ball bearing 42, utilize the spring to carry out axial positioning to first ball bearing 41, utilize the buckle to carry out axial positioning to second ball bearing 42.

Step S5: and standing for a period of time to solidify the adhesive between the first ball bearing 41, the second ball bearing 42 and the middle pipe 3, wherein the first ball bearing 41 and the second ball bearing 42 are assembled.

The assembling method is simple to operate, the assembly and fixation yield of the first ball bearing 41, the second ball bearing 42 and the middle pipe 3 is improved, the concentricity of the first ball bearing 41, the second ball bearing 42 and the middle pipe 3 is ensured, and meanwhile the service life of the fan is prolonged.

In conclusion, the beneficial effects of the invention are as follows:

according to the invention, the first annular groove 61 is positioned in the middle of the first ball bearing 41, and divides the first radial support annular surface 32 into two parts, the two parts of annular support surfaces radially support the first ball bearing 41 together, so that the first ball bearing 41 can be supported more uniformly, the stress uniformity of the first ball bearing 41 is improved, the stress of the first ball bearing 41 is improved, the service life of the first ball bearing 41 is prolonged, and the concentricity of the first ball bearing 41 and the central tube 3 is ensured; the second annular groove 62 is located in the middle of the second ball bearing 42 and divides the second radial support circular ring surface 34 into two parts, and the two parts of circular ring support surfaces together radially support the second ball bearing 42, so that the second ball bearing 42 can be supported more uniformly, the stress uniformity of the second ball bearing 42 is improved, the stress of the second ball bearing 42 is improved, the service life of the second ball bearing 42 is prolonged, and the concentricity of the second ball bearing 42 and the central tube 3 is ensured; according to the invention, the first spiral groove 81 spirally surrounds the first ball bearing 41, and divides the first radial supporting circular ring surface 32 into continuous supporting surfaces, and the continuous supporting surfaces radially support the first ball bearing 41 together, so that more balanced support can be provided for the first ball bearing 41, the stress uniformity of the first ball bearing 41 is improved, the stress of the first ball bearing 41 is further improved, the service life of the first ball bearing 41 is prolonged, and the concentricity of the first ball bearing 41 and the central pipe 3 is ensured; the second spiral groove 82 spirally surrounds the second ball bearing 42, and divides the second radial support circular ring surface 34 into continuous support surfaces, and the continuous support surfaces together radially support the second ball bearing 42, so that more balanced support can be provided for the second ball bearing 42, the stress uniformity of the second ball bearing 42 is improved, the stress of the second ball bearing 42 is further improved, the service life of the second ball bearing 42 is prolonged, and the concentricity of the second ball bearing 42 and the central tube 3 is ensured; according to the invention, the liquid injection grooves are arranged at the tail ends of the first annular groove 61, the second annular groove 62, the first spiral groove 81 and the second spiral groove 82, and the adhesive is injected along the liquid injection grooves, so that the possibility that the adhesive penetrates through the dustproof cover of the ball bearing and enters the ball bearing is avoided, the failure caused by the adhesive entering the ball bearing is reduced, the product yield is improved, the service life of the fan is prolonged, and the fixing process of the ball bearing and the middle pipe is simplified.