Shaft core

Abstract

The utility model discloses a shaft core which comprises a first shaft sleeve made of ceramic, an iron shaft core and a second shaft sleeve, the first shaft sleeve is sleeved in the middle of the shaft core in a close fit mode, and the second shaft sleeve is sleeved at one end of the shaft core in a close fit mode. The inner side end face of the second shaft sleeve is tightly attached to the end face of one end of the first shaft sleeve. According to the utility model, the first shaft sleeve made of ceramic is sleeved outside the iron shaft core, so that a composite shaft core structure combined by two materials is formed, the product strength is ensured, and the electric corrosion phenomenon of the existing iron shaft core is solved.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the technical field of the shaft core spare of the cooling fan / fan / motor, and particularly relates to a shaft core. BACKGROUND

[0002] With the development of society and the change of environment, in order to meet the needs of different customers and different environments, the function and reliability of industrial fans need to be continuously improved, and many fans are used in harsh environments. In order to ensure the stability of these products, the protection requirements of fan products are getting higher and higher. In the humid and harsh environment, the moving parts of most cooling fans, such as iron shaft core, will have electric corrosion phenomenon during operation, which will cause the shaft core to rust prematurely and reduce the service life of the fan. For example, the patent document CN2015211065527 discloses a fan motor shaft core. The shaft core of the above-mentioned fan motor and the shaft core structure of the similar products lack insulation treatment. During the long-term use of the product, the corrosion resistance of the connection part of the shaft core structure is low, which leads to the shortening of the service life of the fan. The way to increase the electric corrosion resistance of the shaft core in the industry is relatively single, such as replacing the shaft core material with ceramic. Although the above-mentioned method can improve the corrosion resistance, the ceramic production process requires high requirements and has very high manufacturing cost, insufficient strength, easy to break and easy to break, which cannot meet the concept of economic saving and improving production efficiency.

[0003] There is also a prior art disclosed in the prior art CN220816029U, which discloses a fan shaft core structure and a cooling fan. An insulating film is plated on the outer surface of the shaft core to improve the electric corrosion resistance of the shaft core. However, the plating of the insulating film has a relatively complex process and high cost. UTILITY MODEL CONTENTS

[0004] The utility model aims to overcome the technical defects of the prior art and provide a shaft core. The first shaft sleeve made of ceramic is sleeved on the outer part of the iron shaft to form a composite shaft core structure composed of two materials. While ensuring the strength of the product, the electric corrosion phenomenon of the iron shaft core in the prior art is solved.

[0005] In order to solve the above technical problems, the utility model provides a kind of shaft core, including the first shaft sleeve made of ceramic and iron shaft and second shaft sleeve, the first shaft sleeve is sleeved in the middle part of the shaft by tight fit, the second shaft sleeve is sleeved in one end of the shaft by tight fit, and the inner side end surface of the second shaft sleeve is in close contact with the one end end surface of the first shaft sleeve.

[0006] Further, the outer periphery of one end of the shaft away from the second shaft sleeve is radially protruded with an integrally formed fixing part, and the inner side end surface of the fixing part is in close contact with the other end end surface of the first shaft sleeve.

[0007] Further, the outer periphery of the fixed part is concavely provided with a ring groove.

[0008] Further, the end of the shaft core far from the fixed part is a circular arc transition surface, and the outer end of the fixed part is a conical frustum with a small outer diameter and a large inner diameter.

[0009] Further, the outer diameters of the fixed part, the second shaft sleeve and the first shaft sleeve are the same.

[0010] In a second aspect, the utility model also provides a shaft core, which comprises a first shaft sleeve made of ceramic and an iron shaft core, a second shaft sleeve and a third shaft sleeve, the first shaft sleeve is sleeved on the middle part of the shaft core through tight fitting, the second shaft sleeve is sleeved on one end of the shaft core through tight fitting, the third shaft sleeve is sleeved on the other end of the shaft core through tight fitting, and the inner end faces of the second shaft sleeve and the third shaft sleeve are tightly attached to the two end faces of the first shaft sleeve respectively.

[0011] Further, the outer periphery of the third shaft sleeve is concavely provided with a ring groove.

[0012] Further, the two end parts of the shaft core are circular arc transition surfaces.

[0013] Further, the outer end of the third shaft sleeve is a conical frustum with a small outer diameter and a large inner diameter.

[0014] Further, the outer diameters of the first shaft sleeve, the second shaft sleeve and the third shaft sleeve are the same.

[0015] The utility model has the following beneficial effects:

[0016] In the utility model, the first shaft sleeve made of ceramic is sleeved on the middle part of the iron shaft core to form a composite shaft core structure combined with two materials, the corrosion resistance of the shaft core product is improved by using the corrosion resistance of ceramic, the problem of insufficient strength of the ceramic shaft core is avoided by matching the iron shaft core with the ceramic shaft sleeve, and the strength of the shaft core product is improved, so that the electric corrosion phenomenon is solved while the strength of the shaft core product is ensured; the second shaft sleeve made of iron is sleeved on one end of the shaft core, which is convenient for the first shaft sleeve to be installed on the outer periphery of the shaft part of the shaft core, and the end is used as a part connected with the external shell (such as a motor shell), and the structure of the iron can ensure that the structure strength of the connecting end meets the requirements.

[0017] Secondly, the second shaft sleeve is arranged to make the overall outer diameter of the shaft core the same, which is convenient for riveting with the mounting hole in the external motor shell.

[0018] Additional aspects and advantages of the utility model will be partially given in the following description, which will become apparent from the following description or be understood through the practice of the utility model. BRIEF DESCRIPTION OF DRAWINGS

[0019] The drawings described herein are used to provide further understanding of the present application, form a part of the present application, and do not constitute an improper limitation on the present application, and in the drawings:

[0020] Figure 1 is a schematic view of the shaft core in Example 1;

[0021] Figure 2 is a schematic view of the shaft core in Example 1 after the first shaft sleeve is installed on the shaft core;

[0022] Figure 3 is a schematic view of the shaft core in Example 1 after the second shaft sleeve is installed on the shaft core;

[0023] Figure 4 is a schematic view of the shaft core and the motor shell assembled in Example 1;

[0024] Figure 5 is a schematic view of the shaft core and the copper seat or iron seat assembled in Example 1;

[0025] Figure 6 is a schematic view of the shaft core in Example 2;

[0026] Figure 7 is a schematic view of the shaft core in Example 2 after the third shaft sleeve is installed on the shaft core;

[0027] Figure 8 is a schematic view of the shaft core in Example 2 after the first shaft sleeve is installed on the shaft core;

[0028] Figure 9 is a schematic view of the shaft core in Example 2 after the second shaft sleeve is installed on the shaft core;

[0029] Figure 10 is a schematic view of the shaft core and the motor shell assembled in Example 2;

[0030] Figure 11 is a schematic view of the shaft core and the copper seat or iron seat assembled in Example 2. DETAILED DESCRIPTION

[0031] In order to more fully understand the technical content of the present application, the present application will be further introduced and explained in combination with the drawings and specific embodiments; it should be noted that if there are "first", "second" and the like descriptions in the text, they are used to distinguish different components, etc., and do not represent the order of sequence, nor limit the "first" and "second" to be different types.

[0032] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments; based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without making creative work shall fall within the scope of protection of the present invention.

[0033] Example 1

[0034] like Figures 1 to 3 As shown, the shaft core shown in this embodiment includes a first sleeve 1 made of ceramic and a shaft core 2 and a second sleeve 3 both made of iron. The shaft core 2 is a solid columnar structure, and an integrally formed fixing portion 21 is radially protruded on the outer periphery of one end of the shaft core 2, that is, the outer diameter of the fixing portion 21 is larger than the outer diameter of the shaft core 2, thereby forming a stop step between the fixing portion 21 and the shaft core 2, and the fixing portion 21 is used as a stop limit structure at one end of the shaft core 2. The first sleeve 1 is tightly fitted to the middle of the shaft core 2 by riveting, and the inner end face of the fixing portion 21 is in close contact with the end face of one end of the first sleeve 1. The end of the shaft 2 away from the fixed part 21 is inserted into the outer periphery of the shaft 2, and the center hole diameter of the first sleeve 1 is slightly smaller than the outer diameter of the shaft 2, so that the two are tightly fitted and fixed after riveting, avoiding the problem of relative rotation between the two; the second sleeve 3 is tightly fitted on the other end part of the shaft 2 by riveting, and the inner end face of the second sleeve 3 is in close contact with the other end face of the first sleeve 1, and the second sleeve 3 is inserted into the outer periphery of the shaft 2 from the end of the shaft 2 away from the fixed part 21, and the center hole diameter of the second sleeve 3 is slightly smaller than the outer diameter of the shaft 2, so that the two are tightly fitted and fixed after riveting, avoiding the problem of relative rotation between the two.

[0035] In the above, by sequentially sleeving the first shaft sleeve 1 and the second shaft sleeve 3 on the shaft core 2, the entire shaft core 2 is covered by the first shaft sleeve 1 and the second shaft sleeve 3 except for the fixed part, forming a composite shaft core structure of two material combinations, that is, the shaft core composed of the composite structure is still iron on the outside of both ends, and the middle part is covered and protected by the first shaft sleeve made of ceramic. When the shaft core is applied to products such as heat dissipation fans, blowers or motors, the two ends of the shaft core are mainly used for connection and limiting fixation with the external shell, and only the middle part is the part placed in the electromagnetic coil area, which may have the problem of electric corrosion. Therefore, the middle part of the shaft core in the embodiment utilizes the corrosion resistance of ceramic to improve the corrosion resistance of the shaft core product, and the composite structure of the iron shaft core and the ceramic shaft sleeve can avoid the problem of insufficient strength of the ceramic shaft core, thereby improving the strength of the shaft core product, so as to ensure the strength of the shaft core product while solving the electric corrosion phenomenon. Secondly, the iron second shaft sleeve is sleeved on one end of the shaft core, which is convenient for the first shaft sleeve to be installed in the outer periphery of the middle part of the shaft core, and the second shaft sleeve is used as the connecting part with the external shell (such as the motor shell shown in Figure 4 ) or the seat body (such as the copper seat / iron seat shown in Figure 5 ), and the iron structure can ensure that the structural strength of the connecting end meets the requirements, avoiding the problem of damage and rupture of the ceramic shaft sleeve due to insufficient strength when used as a connection.

[0036] Preferably, the outer diameters of the fixed part 21, the second shaft sleeve 3 and the first shaft sleeve 1 are the same,

[0037] Preferably, the outer periphery of the fixed part 21 is recessed with a ring groove 22, and when the shaft core is applied to an external product (such as a motor), the end with the second shaft sleeve is riveted and assembled together with the motor shell (as shown in Figure 4 ), and after the bearing is installed in the outer periphery of the shaft core, a circlip (not shown in the figure) is sleeved in the ring groove 22.

[0038] Preferably, the end of the shaft core 2 away from the fixed part 21 is a circular arc transition surface 24, which plays a guiding role and facilitates the installation of the first shaft sleeve 1 and the second shaft sleeve 3 in the outer periphery of the shaft core 1 from this end; and the outer side end of the fixed part 21 is a small outer diameter and large inner diameter conical frustum 23, which facilitates the installation of the external bearing in the outer periphery of the shaft core from this end.

[0039] Embodiment 2

[0040] As shown in Figures 6 to 9As shown, the shaft core shown in the embodiment comprises a first shaft sleeve 1 made of ceramic and a shaft core 2, a second shaft sleeve 3 and a third shaft sleeve 4 all made of iron. The shaft core 2 is a solid columnar structure with the same overall outer diameter. The third shaft sleeve 4 is tightly fitted and assembled on one end of the shaft core 2 by riveting. At this time, an end stop limiting structure is formed between the third shaft sleeve 4 and the shaft core 2. The first shaft sleeve 1 is tightly fitted and assembled on the middle part of the shaft core 2 by riveting. The inner side end surface of the third shaft sleeve 4 is in close contact with one end surface of the first shaft sleeve 1. The first shaft sleeve 1 is assembled into the outer periphery of the shaft core 2 from the end of the shaft core 2 away from the third shaft sleeve 4. The second shaft sleeve 3 is tightly fitted and assembled on the other end of the shaft core 2 by riveting. The inner side end surface of the second shaft sleeve 3 is in close contact with the other end surface of the first shaft sleeve 1. The second shaft sleeve serves as the part connected to the external shell (such as the motor shell shown in Figure 10 ) or the seat body (such as the copper / iron seat shown in Figure 11 ). The center hole diameters of the first shaft sleeve 1, the second shaft sleeve 3 and the fourth shaft sleeve 4 are all slightly smaller than the outer diameter of the shaft core 2. After the three are riveted and fitted with the outer periphery of the shaft core, they are tightly fixed to avoid the problem of relative rotation of the three with respect to the shaft core.

[0041] In the above, by sequentially assembling the third shaft sleeve 4, the first shaft sleeve 1 and the second shaft sleeve 3 on the entire outer periphery of the shaft core 2, the entire outer periphery of the shaft core 2 is completely covered by the third shaft sleeve 4, the first shaft sleeve 1 and the second shaft sleeve 3, forming a composite shaft core structure of two material combinations. That is, in addition to the outer surface of the two ends being made of iron, the middle part of the shaft core is completely covered and protected by the first shaft sleeve made of ceramic. When the shaft core is applied to products such as heat dissipation fans, blowers or motors, the two ends of the shaft core are mainly used for connection and limiting fixation with the external shell. Only the middle part is the part placed in the electromagnetic coil area, which may have the problem of electric corrosion. Therefore, in the embodiment, the middle part of the shaft core utilizes the corrosion resistance of ceramic to improve the corrosion resistance of the shaft core product. The composite structure of the iron shaft core and the ceramic shaft sleeve can avoid the problem of insufficient strength of the ceramic shaft core, improving the strength of the shaft core product, thereby ensuring the strength of the shaft core product while solving the electric corrosion phenomenon.

[0042] Preferably, the outer diameters of the first shaft sleeve 1, the second shaft sleeve 3 and the third shaft sleeve 4 are the same.

[0043] Preferably, the outer periphery of the third shaft sleeve 4 is recessed with a ring groove 22. When the shaft core is applied to external products (such as a motor), first, the end with the second shaft sleeve is riveted and assembled together with the motor shell (as shown in Figure 10 ). After the bearing is assembled into the outer periphery of the shaft core, a circlip (not shown in the figure) is assembled into the ring groove 22.

[0044] Preferably, the outer side end of the third shaft sleeve 4 is a small inside large outside conical frustum 23, which facilitates the assembly of the external bearing into the outer periphery of the shaft core from this end.

[0045] Preferably, the two ends of the shaft 2 are both circular arc transition surfaces 24, which play a guiding role, and the first shaft sleeve 1, the second shaft sleeve 3 and the third shaft sleeve 4 are conveniently assembled into the outer periphery of the shaft 1 from the two ends by using the circular arc transition surfaces 24.

[0046] The above describes the technical solutions provided by the embodiments of the present application in detail, and the principles and implementation manners of the embodiments of the present application are described by using specific examples; the above description of the embodiments is only applicable to helping understand the principles of the embodiments of the present application; meanwhile, for the general technical personnel in the field, the embodiments of the present application will have changes in the specific implementation manners and application ranges, and the above description should not be understood as a limitation on the embodiments of the present application.

Claims

1. A shaft core, characterized by, The first sleeve is made of ceramic and is tightly fitted on the middle part of the shaft core, the second sleeve is made of iron and is tightly fitted on one end of the shaft core, and the inner end surface of the second sleeve is tightly fitted with one end surface of the first sleeve.

2. The shaft core of claim 1, wherein The outer periphery of one end of the shaft core away from the second sleeve is radially protruded with an integral fixing part, and the inner end surface of the fixing part is tightly fitted with the other end surface of the first sleeve.

3. The shaft core of claim 2, wherein The outer periphery of the fixing part is concavely provided with a ring groove.

4. The shaft core of claim 3, wherein The end of the shaft core away from the fixing part is a circular arc transition surface, and the outer end of the fixing part is a conical frustum with a small outer diameter and a large inner diameter.

5. The shaft core of claim 4, wherein The outer diameters of the fixing part, the second sleeve and the first sleeve are the same.

6. A shaft core, characterized by The first sleeve is made of ceramic and is tightly fitted on the middle part of the shaft core, the second sleeve is made of iron and is tightly fitted on one end of the shaft core, the third sleeve is made of iron and is tightly fitted on the other end of the shaft core, and the inner end surfaces of the second sleeve and the third sleeve are tightly fitted with the two end surfaces of the first sleeve.

7. The shaft core of claim 6, wherein The outer periphery of the third sleeve is concavely provided with a ring groove.

8. The shaft core of claim 7, wherein The two ends of the shaft core are both circular arc transition surfaces.

9. The shaft core of claim 8, wherein The outer end of the third sleeve is a conical frustum with a small outer diameter and a large inner diameter.

10. A core as claimed in any one of claims 6 to 9, wherein, The outer diameters of the first sleeve, the second sleeve and the third sleeve are the same.

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