Rotating shaft and water pump

Abstract

The utility model relates to the technical field of water pumps, in particular to a rotating shaft and a water pump. The rotating shaft comprises a shaft rod and a ring body. In the axial direction of the shaft rod, the shaft rod comprises a first section and a second section, the two ends of the second section are connected with the first section, and the outer diameter of the second section is smaller than that of the first section. The ring body is sleeved on the second section. The corrosion resistance of the ring body is better than that of the shaft rod, and the wear resistance of the ring body is better than that of the shaft rod. According to the rotating shaft and the water pump, the shaft rod is sleeved with the ring body, the corrosion resistance and the abrasion resistance of the ring body are better than those of the shaft rod, the ring body makes contact with the bearing, abrasion and corrosion of the rotating shaft are reduced, and the service life of the rotating shaft is prolonged.

Description

Technical Field

[0001] The present application relates to the technical field of water pumps, and in particular to a rotating shaft and a water pump. Background Art

[0002] A water pump is a machine used to transport or pressurize liquids. It transfers mechanical energy from a prime mover or other external energy to the liquid, increasing its energy. It is primarily used to transport liquids including water, oil, acids and alkalis, emulsions, suspensions, and liquid metals. Water pumps are widely used in various industries, including but not limited to agriculture, chemical industry, urban water supply, sewage systems, and industrial systems, making them an indispensable piece of equipment in modern industry and agriculture.

[0003] A water pump consists of a stator, rotor, and impeller. The rotor drives the impeller to rotate relative to the stator, thereby pumping liquid. The rotor includes a shaft. During operation, the shaft and bearings rub against each other. The shaft is typically made of stainless steel, which offers excellent wear resistance and thus extends its service life.

[0004] However, when the liquid transported by the water pump is a high-temperature liquid or a corrosive liquid, the friction between the stainless steel shaft and the bearing is prone to wear and corrosion, shortening the service life of the shaft. Utility Model Content

[0005] The embodiments of the present application aim to provide a rotating shaft and a water pump, so as to at least extend the service life of the rotating shaft.

[0006] In order to solve the above technical problems, the embodiments of the present application adopt the following technical solutions:

[0007] In a first aspect, embodiments of the present application provide a rotating shaft comprising a shaft and a ring body. Axially, the shaft comprises a first section and a second section, with both ends of the second section connected to one of the first sections, and the outer diameter of the second section being smaller than that of the first section. The ring body is sleeved over the second section. The corrosion resistance of the ring body is superior to that of the shaft, and the wear resistance of the ring body is superior to that of the shaft.

[0008] In some embodiments, the cross-section of the second section deviates from a circle.

[0009] In some embodiments, the cross section of the second section is circular, the second section is provided with a first hole, and at least one end of the first hole passes through to the outer circumference of the second section.

[0010] In some embodiments, the cross section of the second section is circular, and the outer peripheral surface of the second section is provided with an anti-slip structure.

[0011] In some embodiments, the outer diameter of the ring is equal to the outer diameter of the first segment.

[0012] In some embodiments, the outer diameter of the ring body is larger than the outer diameter of the first segment.

[0013] In some embodiments, along the axial direction of the shaft, the length of the ring body is equal to the length of the second section on which the ring body is sleeved.

[0014] In some embodiments, the shaft includes a third section along the axial direction of the shaft, one end of the third section is connected to one end of the first section; the cross section of the third section is different from a circle, and the third section is used to connect to the impeller.

[0015] In some embodiments, the end face of one end where the first section is connected to the third section is partially exposed; a first retaining groove is provided on the outer peripheral surface of the third section, and the first retaining groove surrounds the third section circumferentially along the third section. The first retaining groove is used to install a first retaining ring, and the first retaining ring cooperates with the third section to limit the impeller to the third section.

[0016] In some embodiments, a second retaining groove is provided on the outer circumferential surface of the first segment. The second retaining groove surrounds the first segment along the circumference of the first segment. The second retaining groove is used to install a second retaining ring.

[0017] In some embodiments, the ring body is made of plastic, and the ring body is molded around the second section.

[0018] In some embodiments, the ring body comprises PEEK material.

[0019] In a second aspect, an embodiment of the present application provides a water pump, comprising a rotating shaft as described in any one of the above items.

[0020] The rotating shaft and water pump of the embodiments of the present application are provided with a ring body on the shaft sleeve. The corrosion resistance and wear resistance of the ring body are better than those of the shaft. The contact between the ring body and the bearing reduces the wear and corrosion of the rotating shaft and extends the service life of the rotating shaft.

[0021] The above description is only an overview of the technical solution of the present application. In order to more clearly understand the technical means of the present application, it can be implemented in accordance with the contents of the specification. In order to make the above and other purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are listed below. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] One or more embodiments are exemplarily illustrated by corresponding drawings, which do not constitute limitations on the embodiments. Elements with the same reference numerals in the drawings are represented as similar elements, and unless otherwise stated, the figures in the drawings do not constitute proportional limitations.

[0023] Figure 1 This is a schematic structural diagram of a rotating shaft according to an embodiment of the present application;

[0024] Figure 2 This is a schematic structural diagram of a water pump according to an embodiment of the present application;

[0025] Figure 3 yes Figure 2 A partial enlarged view of point A in the middle;

[0026] Figure 4 This is a schematic structural diagram of the shaft in one embodiment of the present application;

[0027] Figure 5 This is a schematic structural diagram of the shaft in one embodiment of the present application;

[0028] Figure 6 It is a schematic structural diagram of the shaft rod in one embodiment of the present application.

[0029] The accompanying drawings in the specific implementation manner are as follows:

[0030] 100. Water pump;

[0031] 1. Rotating shaft; 11. Shaft; 111. First section; 1111. Second slot; 112. Second section; 1121. First hole; 1122. Anti-slip structure; 113. Third section; 1131. First slot; 12. Ring body;

[0032] 2. Housing; 3. Bearing; 4. Impeller; 5. Magnet assembly; 6. Coil assembly; 7. First retaining ring; 8. Second retaining ring. DETAILED DESCRIPTION

[0033] To facilitate understanding of the present application, the present application will be described in more detail below in conjunction with the accompanying drawings and specific embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not intended to limit the present application. It should be noted that when an element is described as "fixed to" another element, it can be directly on the other element, or there can be one or more centered elements therebetween. When an element is described as "connected to" another element, it can be directly connected to the other element, or there can be one or more centered elements therebetween.

[0034] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the art to which this application belongs; the terms used herein are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" and any variations thereof in the specification and claims of this application and the above-mentioned figure descriptions are intended to cover non-exclusive inclusions.

[0035] In the description of the embodiments of the present application, the technical terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing the embodiments of the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the embodiments of the present application.

[0036] In the description of the embodiments of this application, the use of terms such as "first" and "second" to define components is merely for the purpose of distinguishing the corresponding components. Unless otherwise stated, these terms have no special meaning and therefore should not be construed as limiting the scope of protection of this application. In the description of the embodiments of this application, the meaning of "plurality" is two or more, unless otherwise specifically defined.

[0037] Unless otherwise defined, all technical and scientific terms used in this specification have the same meanings as those commonly understood by those skilled in the art to which this application belongs. The terms used in this specification are intended only to describe specific embodiments and are not intended to limit this application. The term "and / or" as used in this specification includes any and all combinations of one or more of the relevant listed items.

[0038] In addition, the technical features involved in different embodiments of the present application described below can be combined with each other as long as they do not conflict with each other.

[0039] In the first aspect, the embodiment of the present application provides a rotating shaft 1, see Figure 1The rotating shaft 1 includes a shaft 11 and a ring body 12. The shaft 11 is in the shape of an elongated strip, and the shaft 11 is a rotating body, such as a cylinder, which is conducive to enhancing the dynamic balance of the shaft 11 during rotation. The shaft 11 is made of metal, such as stainless steel, aluminum alloy, etc., which is conducive to increasing the strength and hardness of the shaft 11 and extending the service life of the shaft 11. The ring body 12 is sleeved on the shaft 11, and the ring body 12 is used to contact the bearing 3, thereby reducing the wear of the shaft 11. When the ring body 12 is severely worn, the ring body 12 can be replaced, so that the rotating shaft 1 can continue to be used, reducing the use cost of the rotating shaft 1.

[0040] In the embodiment of the present application, the rotating shaft 1 is applied to a water pump 100 as an example for description. It is understandable that the rotating shaft 1 can also be applied to a motor, a fan, etc. Figure 2 and Figure 3 The embodiment of the present application provides a water pump 100, which includes a rotating shaft 1, a housing 2, a bearing 3, an impeller 4, a magnet group 5 and a coil group 6. The bearing 3 is arranged on the housing 2, and the rotating shaft 1 is passed through the bearing 3 so that the rotating shaft 1 can be rotatably mounted on the housing 2. The magnet group 5 is sleeved on the rotating shaft 1 and is fixedly connected to the rotating shaft 1. The coil group 6 is fixed to the housing 2. By applying a periodically changing current to the coil group 6, a periodically changing magnetic field can be generated in the housing 2, thereby driving the magnet group 5 and the rotating shaft 1 to rotate. The impeller 4 is sleeved on the rotating shaft 1 and is fixedly connected to the rotating shaft 1, so that the rotating shaft 1 drives the impeller 4 to rotate, thereby realizing the water pump 100 to transport the liquid. Among them, the bearing 3 is a sliding bearing 3, that is, when the rotating shaft 1 rotates relative to the bearing 3, the contact surface of the rotating shaft 1 and the bearing 3 slides relative to each other, and the rotating shaft 1 and the bearing 3 rub against each other.

[0041] It should be noted that the water pump 100 is not only used to transport water, but can also be used to transport other liquids, including but not limited to oil, acid and alkali liquids, emulsions, suspensions and liquid metals.

[0042] In some embodiments, the corrosion resistance of the ring body 12 is better than that of the shaft 11, and the wear resistance of the ring body 12 is better than that of the shaft 11. This can reduce the wear and corrosion of the ring body 12, extend the service life of the ring body 12, and further extend the service life of the rotating shaft 1.

[0043] In some embodiments, the shaft 11 is made of stainless steel. Under high temperature conditions, as the temperature rises, the yield strength and tensile strength of stainless steel increase, while the hardness decreases and the toughness increases, making the stainless steel susceptible to plastic deformation, increasing the cutting effect of abrasive particles on the stainless steel surface, and causing the stainless steel to wear more severely. After the stainless steel surface is worn, it is extremely susceptible to corrosion in corrosive liquids, such as acidic liquids. In the embodiment of the present application, a ring body 12 is provided on the outer circumference of the shaft 11 to improve the wear and corrosion problems of the stainless steel shaft 11.

[0044] In some embodiments, the ring body 12 is made of plastic. Plastic materials generally have better corrosion resistance than metal materials, such as stainless steel and aluminum alloys. Some plastic materials, such as PEEK (polyetheretherketone), Teflon, nylon, and POM (polyoxymethylene), have high wear and corrosion resistance, and even exhibit wear and corrosion resistance superior to that of stainless steel. Preferably, the ring body 12 comprises PEEK.

[0045] When the ring body 12 is made of plastic, the ring body 12 can be overmolded in the second section 112 through an overmolding process, which is beneficial to reducing the production cost of the rotating shaft 1. In addition, the ring body 12 fits tightly with the shaft 11, and there is bonding force between the ring body 12 and the shaft 11, which improves the problem of the ring body 12 being loose relative to the shaft 11.

[0046] For the shaft 11, see Figure 4 Along the axial direction of the shaft 11, the shaft 11 includes a first section 111 and a second section 112. Both ends of the second section 112 are connected to a first section 111. The outer diameter of the second section 112 is smaller than the outer diameter of the first section 111. It is understood that there are at least two first sections 111. Optionally, the first section 111 and the second section 112 are cylindrical.

[0047] The ring body 12 is sleeved on the second section 112. Since the outer diameter of the second section 112 is smaller than that of the first section 111, the ring body 12 is prevented from axially separating from the second section 112 and is thus confined to the second section 112.

[0048] In some embodiments, see Figure 3 The number of the second sections 112 is two, and the number of the first sections 111 is three. Thus, the shaft 11 can be sleeved with two ring bodies 12, and the shaft 1 is rotatably connected to the bearing 3 at two locations, thereby enhancing the stability of the rotational connection between the shaft 11 and the housing 2.

[0049] When the rotating shaft 1 is in operation, the ring body 12 and the bearing 3 rub against each other, causing the ring body 12 to tend to rotate relative to the shaft 11. Over time, or if the friction between the ring body 12 and the bearing 3 is high, the ring body 12 may rotate relative to the shaft 11. The friction between the ring body 12 and the shaft 11 increases the wear of the ring body 12 and the shaft 11, shortening the service life of the rotating shaft 1.

[0050] To improve the above problems, the present invention provides three solutions:

[0051] Option 1: Please refer to Figure 4The cross-section of the second section 112 is different from a circle. For example, the cross-section of the second section 112 can be polygonal, elliptical, etc. The cross-section of the second section 112 can also be formed by a combination of straight lines and curves, such as a drum shape, which is the shape of the middle portion of a circle divided by two parallel lines. It is understood that the ring body 12 has a through hole that is compatible with the second section 112. Since the cross-section of the second section 112 is not circular, the problem of the ring body 12 rotating relative to the shaft 11 can be alleviated.

[0052] Option 2: Please refer to Figure 5 The second section 112 has a circular cross-section and is provided with a first hole 1121. At least one end of the first hole 1121 extends through the outer circumference of the second section 112. The ring body 12 can be partially located within the first hole 1121, or a pin can pass through the ring body 12 and be inserted into the first hole 1121, thereby improving the problem of the ring body 12 rotating relative to the shaft 11. Optionally, both ends of the first hole 1121 extend through the outer circumference of the second section 112. Optionally, the cross-section of the first hole 1121 is circular. Optionally, the second section 112 is provided with multiple first holes 1121.

[0053] Option 3: Please refer to Figure 6 The second section 112 has a circular cross-section, and an anti-slip structure 1122 is provided on the outer circumference of the second section 112. The anti-slip structure 1122 can be a plurality of grooves, a plurality of ridges, or anti-slip grooves surrounding the second section 112 along the circumference thereof, which can increase the friction force when the ring body 12 rotates relative to the shaft 11, thereby improving the problem of the ring body 12 rotating relative to the shaft 11.

[0054] In some embodiments, see Figure 1 The outer diameter of the ring body 12 is equal to the outer diameter of the first section 111. The rotating shaft 1 is then cylindrical as a whole, which alleviates the problem of the stepped shape of the rotating shaft 1 hindering the installation of parts mounted on the rotating shaft 1. For example, the through hole of the magnet group 5 mounted on the rotating shaft 1 is usually equal to the outer diameter of the middle section of the rotating shaft 1. If the outer diameter of the ring body 12 is not equal to the outer diameter of the first section 111, when the magnet group 5 is installed, the edge of the through hole of the magnet group 5 is likely to touch the end face of the ring body 12 or the first section 111, hindering the installation of the magnet group 5, thereby facilitating the connection between the rotating shaft 1 and other parts of the water pump 100.

[0055] In some embodiments, the outer diameter of the ring body 12 is larger than the outer diameter of the first section 111. When the outer diameter of the ring body 12 is larger than the outer diameter of the first section 111, the first section 111 is spaced apart from the bearing 3 in the radial direction of the first section 111. This can alleviate the problem of the first section 111 contacting and rubbing against the bearing 3, thereby extending the service life of the shaft 11.

[0056] In some embodiments, see Figure 1 Along the axial direction of the shaft 11, the length of the ring body 12 is equal to the length of the second section 112 on which the ring body 12 is sleeved. That is, the two axial ends of the ring body 12 respectively contact the end surfaces of the two first sections 111, making it difficult for the ring body 12 to slide axially relative to the second sections 112, thereby reducing the mutual friction between the ring body 12 and the shaft 11 and extending the service life of the rotating shaft 1.

[0057] In some embodiments, see Figure 1 Along the axial direction of the shaft 11, the shaft 11 includes a third section 113, one end of which is connected to one end of the first section 111. The cross-section of the third section 113 deviates from a circle. For example, the cross-section of the third section 113 may be polygonal, elliptical, etc. The cross-section of the third section 113 may also be formed by a combination of straight lines and curves, such as a drum shape, which is the shape of the middle portion of a circle divided by two parallel lines.

[0058] The third section 113 is used to connect with the impeller 4. It is understandable that the impeller 4 has a through hole adapted to the third section 113. Since the cross section of the third section 113 is not circular, when the shaft 11 rotates, the impeller 4 will rotate synchronously therewith.

[0059] In some embodiments, see Figure 4 The end surface of the first section 111 at one end where it connects to the third section 113 is partially exposed. It is understood that if the impeller 4 has a through hole that matches the third section 113, the end surface of the first section 111 can abut against the impeller 4, preventing the impeller 4 from sliding into the first section 111.

[0060] In some embodiments, see Figure 3 and Figure 4 The outer circumferential surface of the third section 113 is provided with a first retaining groove 1131. The first retaining groove 1131 circumferentially surrounds the third section 113 and is used to mount a first retaining ring 7. When the first retaining ring 7 is mounted in the first retaining groove 1131, it protrudes radially from the third section 113. This allows the first retaining ring 7 to abut against the impeller 4, preventing the impeller 4 from separating from the third section 113. Optionally, the first retaining ring 7 is a retaining spring.

[0061] Through the cooperation between the end face of the first section 111 and the first retaining ring 7 , the axial position of the impeller 4 in the third section 113 can be limited, that is, the first retaining ring 7 cooperates with the third section 113 to limit the impeller 4 in the third section 113 .

[0062] In some embodiments, see Figure 3 and Figure 4The outer circumference of the first section 111 is provided with a second retaining groove 1111. The second retaining groove 1111 surrounds the first section 111 circumferentially and is used to mount the second retaining ring 8. When the magnet group 5 is mounted on the shaft 1, the magnet group 5 can slide along the shaft 1. When the second retaining ring 8 is mounted in the second retaining groove 1111, the second retaining ring 8 protrudes from the first section 111 in the radial direction of the first section 111. Please refer to Figure 3 The magnet group 5 is sleeved on the second retaining ring 8. The second retaining ring 8 and the inner wall of the through hole of the magnet group 5 are pressed against each other, so that a large static friction force can be generated between the second retaining ring 8 and the magnet group 5 to limit the position of the magnet group 5 relative to the first section 111 along the axial direction of the first section 111. Optionally, the second retaining ring 8 is made of an elastic material, such as a rubber ring or a silicone ring.

[0063] In other embodiments, the second retaining ring 8 abuts against the end surface of the magnet group 5 along the axial direction of the first section 111, thereby preventing the magnet group 5 from sliding in one direction along the first section 111. Optionally, there are two second retaining grooves 1111, and the two second retaining grooves 1111 are located on either side of the magnet group 5 along the radial direction of the first section 111. In this way, the two second retaining rings 8 can prevent the magnet group 5 from sliding in two opposite directions along the first section 111, thereby limiting the position of the magnet group 5 relative to the first section 111 along the axial direction of the first section 111. Optionally, the second retaining ring 8 is a retaining spring.

[0064] In the second aspect, the present invention provides a water pump 100. Figure 2 The water pump 100 includes a rotating shaft 1. The water pump 100 has the structural features and beneficial effects of the rotating shaft 1, which will not be described in detail here.

[0065] In the rotating shaft 1 and water pump 100 of the present embodiment, the shaft 11 is sleeved with a ring body 12. The ring body 12 has superior corrosion resistance and wear resistance to the shaft 11. The contact between the ring body 12 and the bearing 3 reduces wear and corrosion of the rotating shaft 1, thereby extending the service life of the rotating shaft 1. When the ring body 12 is severely worn, the ring body 12 can be replaced, allowing the rotating shaft 1 to continue to be used, thereby reducing the cost of using the rotating shaft 1.

[0066] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them. Based on the concept of the present application, the technical features in the above embodiments or different embodiments can also be combined, the steps can be implemented in any order, and there are many other changes in different aspects of the present application as described above. For the sake of simplicity, they are not provided in detail. Although the present application has been described in detail with reference to the aforementioned embodiments, ordinary technicians in this field should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. These modifications or replacements do not deviate the essence of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A rotating shaft, characterized in that: include: A shaft, wherein the shaft comprises a first section and a second section along the axial direction of the shaft, both ends of the second section are connected to one of the first sections, and the outer diameter of the second section is smaller than the outer diameter of the first section; a ring body, sleeved on the second section; The corrosion resistance of the ring body is better than that of the shaft, and the wear resistance of the ring body is better than that of the shaft.

2. The rotating shaft according to claim 1, characterized in that: The cross section of the second section is different from a circle; And / or, the cross section of the second section is circular, the second section is provided with a first hole, and at least one end of the first hole penetrates to the outer circumference of the second section; And / or, the cross section of the second section is circular, and the outer peripheral surface of the second section is provided with an anti-slip structure.

3. The rotating shaft according to claim 1, wherein: The outer diameter of the ring body is equal to the outer diameter of the first section; Alternatively, the outer diameter of the ring body is larger than the outer diameter of the first section.

4. The rotating shaft according to claim 1, wherein: Along the axial direction of the shaft, the length of the ring body is equal to the length of the second section on which the ring body is sleeved.

5. The rotating shaft according to claim 1, characterized in that: Along the axial direction of the shaft, the shaft includes a third section, one end of the third section is connected to one end of the first section; The cross section of the third section is different from a circle, and the third section is used for connecting with an impeller.

6. The rotating shaft according to claim 5, characterized in that: An end surface portion of one end of the first section connected to the third section is exposed; A first clamping groove is provided on the outer peripheral surface of the third section. The first clamping groove surrounds the third section circumferentially. The first clamping groove is used to install a first clamping ring. The first clamping ring cooperates with the third section to limit the impeller to the third section.

7. The rotating shaft according to claim 1, characterized in that: A second clamping groove is provided on the outer peripheral surface of the first section. The second clamping groove surrounds the first section along the circumference of the first section. The second clamping groove is used for installing a second clamping ring.

8. The rotating shaft according to claim 1, wherein: The ring body is made of plastic material, and is plastic-coated in the second section.

9. The rotating shaft according to claim 8, characterized in that: The ring body comprises PEEK material.

10. A water pump, characterized in that: Comprising the rotating shaft according to any one of claims 1 to 9.

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