Cladding shaft and axial flow pump
By setting a reinforcing section with a spiral groove filled with corrosion-resistant material on the outer surface of the shaft, and combining it with an alloy transition layer and a chamfer structure, the problems of complex and costly shaft manufacturing in high-corrosion environments in the prior art are solved, and a low-cost, high-strength and corrosion-resistant clad shaft is achieved.
Patent Information
- Application Number
- CN202520824132.X
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-04-28
- Publication Date
- 2026-02-13
- Estimated Expiration
- 2035-04-28
AI Technical Summary
Existing technologies for manufacturing shafts in highly corrosive and abrasive media environments suffer from complex manufacturing processes, high costs, and poor impact resistance.
The shaft is reinforced with a spiral groove filled with corrosion-resistant material. The spiral groove rotates in the opposite direction to the shaft rotation. Combined with an alloy transition layer and a cladding layer, a chamfered structure is provided to enhance the shaft's shear strength and corrosion resistance.
This invention enables the fabrication of clad shafts that are simple to manufacture, low in cost, and possess sufficient strength and corrosion resistance, thereby extending the service life of equipment under corrosive conditions and reducing maintenance requirements.
Smart Images
Figure CN223908451U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to pump technical field especially relates to a kind of cladding shaft and axial flow pump. BACKGROUND
[0002] In sulfuric acid, nitric acid, organic acid, complex waste water and other strong corrosion, high hard solid content and other high wear medium environment, usually need to be made into shaft body with high chromium, high nickel, high molecular material and other high corrosion and wear resistant materials.
[0003] However, the shaft body is directly prepared using the above-mentioned materials, which has the disadvantages of complex manufacturing process, high cost, and poor impact resistance of the prepared shaft body. INVENTION CONTENTS
[0004] The utility model discloses a kind of cladding shaft and axial flow pump, with the advantages of low cost, simple preparation and sufficient strength.
[0005] To solve the above problems, the utility model adopts the following technical solutions:
[0006] In a first aspect, the application provides a cladding shaft, comprising a shaft body;
[0007] The outer surface of the shaft body is provided with a spiral groove, one end of the spiral groove extends to the sealing area of the shaft body and the impeller;
[0008] The spiral groove is filled with a reinforcing part made of corrosion-resistant material.
[0009] In a further technical solution, the rotation direction of the spiral groove is opposite to the rotation direction of the shaft body.
[0010] In a further technical solution, the groove depth of the spiral groove is 0.5mm-1.5mm.
[0011] In a further technical solution, the pitch of the spiral groove is 5mm-20mm.
[0012] In a further technical solution, the reinforcing part includes an alloy transition layer and a cladding layer; the alloy transition layer and the cladding layer are sequentially arranged in the spiral groove from the groove bottom to the groove opening of the spiral groove.
[0013] In a further technical solution, a first chamfer structure is provided at the corner of the groove opening and / or the groove bottom of the spiral groove.
[0014] In a further technical solution, a second chamfer structure is provided at the corner of at least one end of the alloy transition layer along the extension direction of the shaft body, and / or at the position corresponding to the shaft shoulder of the shaft body.
[0015] In a second aspect, the application provides an axial flow pump, comprising an impeller and the cladding shaft of the first aspect.
[0016] One end of the shaft body is connected with the impeller.
[0017] In a further technical solution, the circumferential wall at the connection between the shaft body and the impeller is provided with a first sealing ring.
[0018] In a further technical solution, the axial side wall at the abutment between the shaft body and the impeller is further provided with a second sealing ring.
[0019] The technical solution adopted by the utility model can achieve the following beneficial effects:
[0020] The cladding shaft of the application is filled with a reinforcing part in the helical groove on the outer surface of the shaft body to increase the shear strength of the shaft body. Moreover, the reinforcing part is made of a corrosion-resistant material, which ensures that the shaft body has sufficient corrosion resistance to meet the reliability of the cladding shaft in a highly corrosive and abrasive environment. BRIEF DESCRIPTION OF DRAWINGS
[0021] In order to more clearly illustrate the technical solutions in the embodiments of the utility model or the prior art, the drawings needed to be used in the embodiment or the prior art description will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the utility model, and for those skilled in the art, other drawings can also be obtained from these drawings without creative labor.
[0022] Figure 1 is a sectional view of the axial flow pump disclosed by some embodiments of the application;
[0023] Figure 2 is Figure 1 is an enlarged view of A in Fig.
[0024] Figure 3 is Figure 1 is an enlarged view of B in Fig.
[0025] Figure 4 is a partial sectional view of the shaft body disclosed by some embodiments of the application.
[0026] In the drawings:
[0027] 100-shaft body, 110-reinforcing part, 111-alloy transition layer, 1111-second chamfer structure, 112-cladding layer, 120-first sealing ring, 130-second sealing ring, 140-helical groove, 141-first chamfer structure;
[0028] 200-axial flow pump, 210-impeller. DETAILED DESCRIPTION
[0029] In order to make the purpose, technical scheme and advantages of the utility model clearer, the technical scheme of the utility model will be described in detail below. Obviously, the described embodiments are only part of the embodiments of the utility model, rather than all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without creative labor belong to the scope protected by the utility model.
[0030] The terms "first", "second" and the like in the specification and claims of the application are used to distinguish similar objects, and are not used to describe a specific order or sequence. It should be understood that the data used in this way can be interchanged under appropriate circumstances, so that the embodiments of the application can be implemented in an order other than those illustrated or described herein, and the objects distinguished by "first", "second" and the like are generally of a kind and do not limit the number of objects, for example, the first object can be one or more. In addition, "and / or" in the specification and claims indicates at least one of the connected objects, and the character " / ", generally indicates that the front and rear associated objects are in an "or" relationship.
[0031] The utility model provides a kind of cladding shaft and axial flow pump 200 in combination with the drawings Figures 1 to 4 The utility model provides a kind of cladding shaft and axial flow pump 200 in combination with the drawings
[0032] Some embodiments of the application disclose a cladding shaft, comprising a shaft body 100.
[0033] As shown in Figure 1 And Figure 4 The outer surface of the shaft body 100 is provided with a spiral groove 140, and the spiral groove 140 is filled with a reinforcing part 110. By arranging the reinforcing part 110 in the spiral groove 140 on the outer surface of the shaft body 100, the shear strength of the shaft body 100 can be increased. Compared with the shaft body 100 made of high chromium, high nickel, high molecular material and other high corrosion and wear resistant materials in the prior art, the shaft body 100 in the embodiment can be directly made of steel, which is simple in manufacturing process and low in cost. The reinforcing part 110 ensures that the shaft body 100 has sufficient shear strength, so that the shaft body 100 is simple in manufacturing process and low in cost, and has sufficient strength.
[0034] As preferred in the embodiment, the shaft body 100 is made of 45 steel. The 45 steel has low cost, melting point close to high chromium and high nickel, and has certain tensile and bending strength, which ensures that the shaft body 100 has sufficient strength and also ensures the metallurgical bonding strength.
[0035] The reinforcing part 110 is made of corrosion-resistant material. The reinforcing part 110 is made of corrosion-resistant material, so that the shaft body 100 can effectively resist chemical corrosion in fluid or environment and prevent the shaft body 100 from being damaged due to corrosion.
[0036] One end of the spiral groove 140 extends to the sealing area between the shaft 100 and the impeller 210. By extending the spiral groove 140 to the sealing area between the shaft 100 and the impeller 210, the reinforcing portion 110 within the spiral groove 140 can effectively prevent damage to the sealing area between the shaft 100 and the impeller 210 due to corrosion, thereby maintaining structural integrity and sealing performance, extending the service life of the shaft 100 and the impeller 210, reducing maintenance requirements caused by corrosion, and ensuring long-term stable operation of the equipment under corrosive conditions.
[0037] The spiral groove 140 rotates in the opposite direction to the rotation of the shaft 100. When the spiral groove 140 rotates in the opposite direction to the rotation of the shaft 100, the opposing forces between the spiral groove 140 and the rotation direction create a dynamic compression effect during the rotation of the shaft 100. As the shaft 100 rotates, the spiral groove 140 causes the reinforcing part 110 to be subjected to a tangential force within the spiral groove 140. This force is opposite to the geometric orientation of the spiral groove 140, forcing the reinforcing part 110 to be continuously pressed against the sidewall of the spiral groove 140 during movement. This compression not only increases the normal contact pressure between the reinforcing part 110 and the spiral groove 140 but also makes the reinforcing part 110 more densely distributed within the spiral groove 140, reducing microscopic gaps and effectively increasing the actual contact area between the two.
[0038] like Figure 2 and Figure 3 As shown, the reinforcing part 110 includes an alloy transition layer 111 and a cladding layer 112; the alloy transition layer 111 and the cladding layer 112 are sequentially disposed in the spiral groove 140 from the bottom of the groove to the opening of the spiral groove 140. During cladding cooling, the shrinkage of the cladding layer 112 is greater than that of the shaft 100, generating tensile stress at the interface, which easily leads to cracking. Therefore, an alloy transition layer 111 is disposed between the cladding layer 112 and the spiral groove 140. Through the gradient of the material's thermal expansion coefficient and composition, thermal stress is alleviated in stages and the interface bonding is optimized. This staged relief of thermal stress and suppression of brittle phases ultimately achieves crack-free cladding.
[0039] The groove depth of the spiral groove 140 is 0.5mm-1.5mm. Controlling the groove depth of the spiral groove 140 within the range of 0.5mm to 1.5mm can balance structural strength and functional requirements: a shallower spiral groove 140 (such as 0.5mm) can reduce the weakening of the rigidity of the shaft 100 and avoid stress concentration; a deeper spiral groove 140 (such as 1.5mm) can accommodate more corrosion-resistant reinforcing parts 110 and enhance the corrosion resistance of the shaft 100.
[0040] In this embodiment, the groove depth of the spiral groove 140 is any one of 0.5mm, 0.7mm, 1mm, 1.2mm, and 1.5mm.
[0041] The pitch of the spiral groove 140 is 5mm-20mm. A smaller pitch (such as 5mm) can increase the distribution density of the spiral groove 140, enhancing local anti-permeability and anti-shear ability; a larger pitch (such as 20mm) can reduce the flow resistance of the fluid in the pump, reduce energy loss and local eddies.
[0042] In this embodiment, the pitch of the spiral groove 140 is any one of 5mm, 7mm, 10mm, 13mm, 15mm, 17mm, and 20mm.
[0043] like Figure 4 As shown, a first chamfer structure 141 is provided at the corners of the groove opening and / or the bottom of the spiral groove 140. By eliminating stress concentration at the sharp corners of the groove opening and / or the bottom of the groove, the risk of cracks or fatigue damage caused by excessive local stress during rotation or under load of the shaft 100 is significantly reduced. The first chamfer structure 141 can also optimize the uniformity of the distribution of the reinforcing part 110 in the spiral groove 140, reduce filling defects, and improve the tightness of the fit between the reinforcing part 110 and the groove wall, thereby enhancing the sealing performance and impermeability.
[0044] In some embodiments, the spiral groove 140 has a first chamfer structure 141 at the corner of the groove opening and the bottom of the groove.
[0045] In some embodiments, a first chamfer structure 141 is provided at the corner of the groove opening of the spiral groove 140.
[0046] In some embodiments, a first chamfer structure 141 is provided at the corner of the bottom of the spiral groove 140.
[0047] like Figure 2 As shown, at least one end of the alloy transition layer 111 along the extension direction of the shaft 100, at a corner, and / or at the shoulder position of the alloy transition layer 111 corresponding to the shaft 100, a second chamfer structure 1111 is provided. By providing the second chamfer structure 1111, the alloy transition layer 111 and the spiral groove 140 form a smooth transition, significantly reducing local stress concentration caused by geometric abrupt changes, and preventing interface peeling or fatigue cracking of the alloy transition layer 111 under alternating loads or thermal stress. At the same time, the second chamfer structure 1111 can optimize the bonding quality between the alloy transition layer 111 and the cladding layer 112, reduce the risk of microcracks or coating peeling caused by sharp edges, reduce contact stress, thereby enhancing the overall strength, fatigue resistance, and long-term operational reliability of the shaft 100 structure.
[0048] In some embodiments, the alloy transition layer 111 is provided with a second chamfer structure 1111 at one end of the extension direction of the shaft 100.
[0049] In some embodiments, the alloy transition layer 111 is provided with a second chamfer structure 1111 at the corner of the end of the axial body 100.
[0050] In some embodiments, the alloy transition layer 111 is provided with a second chamfer structure 1111 at the corner of the end of the axial body 100.
[0051] In some embodiments, the alloy transition layer 111 is provided with a second chamfer structure 1111 at the corner of the end of the axial body 100.
[0052] Some embodiments of the present application also disclose a mixed-flow pump 200, comprising an impeller 210 and a cladding shaft. As shown in Figure 1 One end of the axial body 100 is connected with the impeller 210.
[0053] As shown in Figure 3 The circumferential wall at the connection between the axial body 100 and the impeller 210 is provided with a first sealing ring 120. The first sealing ring 120 provided at the circumferential wall at the connection between the axial body 100 and the impeller 210 can effectively block the leakage path of the medium (such as liquid or gas) in the axial or radial direction, prevent the invasion of external pollutants or the leakage of internal medium, and thus improve the sealing reliability.
[0054] As shown in Figure 3 The axial side wall at the abutment between the axial body 100 and the impeller 210 is further provided with a second sealing ring 130. The second sealing ring 130 added to the axial side wall at the abutment between the axial body 100 and the impeller 210 can form a multiple sealing barrier complementary to the circumferential first sealing ring 120, and effectively block the potential leakage path of the medium in the axial or radial direction.
[0055] It should be noted that, in this document, the terms "comprising", "containing", or any other variant thereof are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements not only includes those elements, but also includes other elements not expressly listed or inherent to such process, method, article, or apparatus. Without more limitations, an element defined by the phrase "comprising a" does not exclude the presence of additional identical elements in the process, method, article, or apparatus that includes the element.
[0056] In addition, it should be noted that the scope of the methods and apparatus in the embodiments of the present application is not limited to performing functions in the order shown or discussed, but can also include performing functions in a substantially simultaneous manner or in a reverse order, for example, the described method can be performed in an order different from that described, and various steps can also be added, omitted, or combined. In addition, the features described with reference to certain examples can be combined in other examples.
[0057] The above merely describes a specific embodiment of the present application, but the protection scope of the present application is not limited thereto, any skilled person in the art can easily think of changes or replacements within the technical range disclosed by the present application, which should be covered within the protection scope of the present application.
Claims
1. A cladding shaft, characterized in that, The shaft body comprises a shaft body; An outer surface of the shaft body is provided with a helical groove, one end of the helical groove extending to a sealing area of the shaft body and the impeller; The helical groove is filled with a reinforcing part made of a corrosion-resistant material.
2. The cladding shaft of claim 1, wherein, The helical groove is opposite in rotation direction to the rotation direction of the shaft body.
3. The cladding shaft of claim 1, wherein, The groove depth of the helical groove is 0.5mm-1.5mm.
4. The cladding shaft of claim 1, wherein, The helical groove has a pitch of 5mm-20mm.
5. The cladding shaft of claim 1, wherein, The reinforcing part comprises an alloy transition layer and a cladding layer; the alloy transition layer and the cladding layer are sequentially arranged in the helical groove from the groove bottom to the groove opening.
6. The cladding shaft of claim 1, wherein, The groove opening and / or the groove bottom of the helical groove is provided with a first chamfer structure at the corner.
7. The cladding shaft of claim 5, wherein, The alloy transition layer is provided with a second chamfer structure at the corner of at least one end of the alloy transition layer along the extension direction of the shaft body, and / or the alloy transition layer is provided with a second chamfer structure corresponding to the shaft shoulder position of the shaft body.
8. An axial flow pump characterised in that, The impeller and the cladding shaft of any one of claims 1-6 are comprised; One end of the shaft body is connected with the impeller.
9. An axial flow pump according to claim 8, wherein, The circumferential wall at the connection between the shaft body and the impeller is provided with a first sealing ring.
10. An axial flow pump according to claim 9, wherein, The axial side wall at the abutment between the shaft body and the impeller is further provided with a second sealing ring.