Thrust bearing and shielded motor rotor
By employing a limiting structure and protective sleeve design for the thrust bearing with a thrust disc and buffer, the problem of the thrust bearing loosening and falling off at high temperatures is solved, achieving efficient operation and noise control of the water pump.
Patent Information
- Application Number
- CN202423048857.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-10
- Publication Date
- 2025-12-09
- Estimated Expiration
- 2034-12-10
AI Technical Summary
In canned motor pumps, the shock absorber of the thrust bearing softens and expands under high temperature conditions, making it unable to hold the shaft and thrust disc tightly, resulting in reduced pump efficiency and increased noise. Furthermore, the rubber shock absorber and graphite thrust disc are prone to loosening and falling off.
The design adopts a thrust grinding disc, which includes a first and second stage set coaxially. The buffer has a hollowed-out first and second ring surface, and a protective sleeve is fitted around the outer periphery of the buffer. The expansion and deformation of the buffer are restricted by the limiting structure and the protective sleeve, ensuring that the thrust grinding disc rotates synchronously with the buffer.
This effectively prevents the buffer from loosening with the thrust bearing after it expands at high temperatures, maintaining the efficient operation of the water pump and reducing noise, and ensuring the thrust bearing rotates stably under high temperature conditions.
Smart Images
Figure CN223648315U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of motor manufacturing technology, specifically to a thrust bearing and a shielded motor rotor. Background Technology
[0002] The thrust bearing used in the rotor assembly of the motor of the canned circulating pump and booster pump is a bearing specifically designed to withstand axial forces. In short, when the pump rotates (the rotor, shaft and impeller rotate synchronously), the thrust bearing rotates together. When the impeller drives the fluid medium to do work, the entire rotating part is subjected to a restraining force parallel to the shaft, and the thrust bearing withstands this force while rotating at high speed, and dynamic friction occurs with the sliding bearing (ceramic Al2O3) on the shield cover.
[0003] Currently, the thrust bearings commonly used in canned motor pumps have a simple structure, consisting of two parts. One part is a thrust disc, made of pressed graphite. Its axial smooth surface contacts the sliding bearing plane, forming a dynamic friction pair, while its radial surface has a clearance fit with the shaft and does not contact the shaft. The other part is a semi-enclosed damper made of rubber, which serves to fix the graphite thrust disc. The damper is interference-fitted with the shaft and rotates with the thrust disc along with the shaft.
[0004] However, when the water pump is conveying high-temperature (usually 95-110℃) liquid media, the buffer softens and expands after being heated, and cannot hold the shaft and thrust bearing tightly. The thrust bearing cannot rotate with the rotor. At this time, the rotor friction resistance increases sharply, which leads to a decrease in water pump efficiency and a significant increase in water pump operating noise. The rubber buffer of the thrust bearing and the graphite thrust bearing cannot hold tightly, and they become loose and fall off. Utility Model Content
[0005] Based on this, the purpose of this utility model is to provide a thrust bearing and a shielded motor rotor, which aims to solve the problem that when a water pump is conveying a high-temperature liquid medium, the buffer softens and expands after being heated, making it unable to hold the shaft and thrust grinding disc tightly. As a result, the thrust bearing cannot rotate with the rotor, leading to a decrease in water pump efficiency and a significant increase in water pump operating noise. Furthermore, the rubber buffer of the thrust bearing and the graphite thrust grinding disc cannot hold tightly, resulting in loosening and detachment.
[0006] To achieve the above objectives, this utility model provides the following technical solution: a thrust bearing comprising a thrust grinding disc, a buffer disposed on the outer periphery of the thrust grinding disc, and a protective sleeve disposed on the outer periphery of the buffer.
[0007] A thrust grinding disc, the thrust grinding disc comprising a first step and a second step coaxially arranged;
[0008] A buffer, wherein the interior of the buffer is hollowed out to form a first ring surface and a second ring surface with a diameter larger than the first ring surface;
[0009] The second step has a larger diameter than the first step and is fitted into the second ring surface so that the buffer and the thrust grinding disc are tightly fitted together. The protective sleeve is fitted around the outer periphery of the buffer to limit the thermal expansion and deformation of the buffer.
[0010] In summary, the thrust bearing provided by this utility model, by having the second step portion engaged within the second ring surface and a protective sleeve fitted around the outer periphery of the buffer, prevents the buffer from failing to hold tightly against the thrust grinding disc after thermal expansion. Simultaneously, the protective sleeve effectively confines the buffer within its enclosure, allowing it to rotate with the rotor shaft. Specifically, the thrust grinding disc includes a first step portion and a second step portion coaxially arranged. The buffer's interior is hollowed out to form a first ring surface and a second ring surface with a diameter larger than the first ring surface. The diameter of the second step portion is larger than that of the first step portion, allowing the second step portion to engage within the second ring surface, thus enabling the thrust grinding disc to rotate with the buffer. Simultaneously, the protective sleeve is fitted around the outer periphery of the buffer to limit its thermal expansion and deformation. The protective sleeve is also tightly fitted to the rotor shaft, thereby driving the internal thrust grinding disc and buffer to rotate.
[0011] According to one aspect of the above technical solution, a plurality of limiting posts are provided on the inner circumference of the second ring surface.
[0012] According to one aspect of the above technical solution, the second step is provided with a limiting port corresponding to the number and position of the limiting posts, and the limiting port is engaged with the circumferential surface of the limiting posts.
[0013] According to one aspect of the above technical solution, the buffer has a number of tooth peaks evenly spaced along its arc surface on its outer periphery, and the top of the tooth peaks abuts against the inner periphery of the protective sleeve.
[0014] According to one aspect of the above technical solution, a tooth groove is provided between adjacent tooth peaks.
[0015] According to one aspect of the above technical solution, the protective sleeve extends toward the buffer with an abutting rounded edge.
[0016] This utility model also proposes a shielded motor rotor, including a rotor shaft, a rotor assembly disposed on the rotor shaft, a front sliding bearing and a rear sliding bearing disposed at both ends of the rotor assembly, and a thrust bearing disposed between the front sliding bearing and the rotor assembly as described above.
[0017] Additional aspects and advantages of this invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description
[0018] The above and / or additional aspects and advantages of this utility model will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which:
[0019] Figure 1 This is a schematic diagram of the thrust bearing in Embodiment 1 of this utility model;
[0020] Figure 2 This is a cross-sectional view of the thrust bearing in Embodiment 1 of this utility model.
[0021] Figure 3 This is a schematic diagram of the structure of the stop-pushing grinding disc in Embodiment 1 of this utility model;
[0022] Figure 4 This is a schematic diagram of the buffer structure in Embodiment 1 of this utility model;
[0023] Figure 5 This is a schematic diagram of the structure of the protective sleeve in Embodiment 1 of this utility model;
[0024] Figure 6 This is a cross-sectional view of the rotor of the shielded motor according to Embodiment 2 of this utility model.
[0025] Explanation of component symbols in the attached diagram:
[0026] Thrust grinding disc 100, first step 110, bending fracture 111, second step 120, limiting port 121, buffer 200, first ring surface 210, second ring surface 220, limiting post 221, tooth peak 230, tooth groove 231, protective sleeve 300, rotor shaft 400, rotor assembly 500, front sliding bearing 600, rear sliding bearing 700, thrust bearing 800. Detailed Implementation
[0027] To make the objectives, features, and advantages of this utility model more apparent and understandable, the specific embodiments of this utility model are described in detail below with reference to the accompanying drawings. Several embodiments of this utility model are shown in the drawings. However, this utility model can be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided to make the disclosure of this utility model more thorough and complete.
[0028] It should be noted that when an element is referred to as being "fixed to" another element, it can be directly on the other element or there may be an intervening element. When an element is considered to be "connected" to another element, it can be directly connected to the other element or there may be an intervening element. The terms "vertical," "horizontal," "left," "right," "upper," "lower," and similar expressions used herein are for illustrative purposes only and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as limiting the present invention.
[0029] In this utility model, unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances. The term "and / or" as used herein includes any and all combinations of one or more of the related listed items.
[0030] Example 1
[0031] Please see Figures 1-5 The diagram shows a schematic of a thrust bearing provided in one embodiment of this utility model. The thrust bearing 800 includes a thrust grinding disc 100, a buffer 200 clamped to the outer periphery of the thrust grinding disc 100, and a protective sleeve 300 sleeved to the outer periphery of the buffer 200, wherein:
[0032] In order to replace the traditional interference fit between the buffer 200 and the thrust mill 100 and avoid the situation where the buffer 200 detaches from the thrust mill 100 due to thermal expansion, this application proposes a thrust bearing 800, which ensures that the thrust mill 100 and the buffer 200 remain tightly bound and rotate together even after being subjected to high temperatures.
[0033] To ensure a tight fit with the buffer 200, the thrust grinding disc 100 in this embodiment includes a first step 110 and a second step 120 coaxially arranged. The diameter of the first step 110 is smaller than the diameter of the second step 120, so that the second step 120 is engaged within the buffer 200. After the second step 120 is engaged within the buffer 200, the first step 110 protrudes from the end face of the buffer 200 for contact with the front sliding bearing.
[0034] Furthermore, the surface of the first step 110 is smooth and wear-resistant, and it has a plurality of bent fractures 111 evenly spaced on its cross-section to provide a passage for the lubricating fluid, thereby ensuring that the lubricating fluid is located on the end face of the first step 110 and the end face of the front sliding bearing, reducing frictional loss. In this embodiment, the material used for the thrust grinding disc 100 is typically graphite or ceramic.
[0035] Furthermore, since the second step 120 is locked inside the buffer 200, in order to prevent the second step 120 from rotating relative to the buffer 200, a number of limiting holes 121 are provided at equal intervals on the arc surface of the second step 120 for locking inside the buffer 200.
[0036] To cooperate with the thrust mill 100, the buffer 200 is hollowed out to form a first ring surface 210 and a second ring surface 220 with a larger diameter than the first ring surface 210. Since the inner circumference of the second ring surface 220 is provided with limiting posts 221 corresponding to the number of limiting ports 121, when the second step 120 is located on the second ring surface 220, the limiting ports 121 are correspondingly engaged with the limiting posts 221. Simultaneously, the first ring surface 210 is located on the first step 110, so that the thrust mill 100 and the buffer 200 are installed as a single unit, thereby ensuring that the thrust mill 100 and the buffer 200 rotate synchronously and do not rotate relative to each other. In this embodiment, the buffer 200 is made of an elastic material, typically EPDM rubber, silicone rubber, fluororubber, or other rubber materials.
[0037] It should be noted that, in order to solve the problem of the buffer 200 softening and bulging under high temperature conditions, the buffer 200 is provided with a number of evenly spaced tooth peaks 230 along its arc surface. The tooth peaks 230 abut against the inner circumference of the protective sleeve 300, and a tooth groove 231 is provided between adjacent tooth peaks 230. When the buffer 200 expands due to heat, the size of the tooth groove 231 is used to meet the thermal expansion volume requirements of rubber under extreme high temperature conditions. Combined with the restraining effect of the protective sleeve 300, the problem of the buffer 200 softening and bulging under high temperature conditions is effectively solved, ensuring that the buffer 200 always holds the thrust bearing 100 tightly and does not loosen under high temperature conditions.
[0038] In addition, the protective sleeve 300 extends towards the buffer 200 with a rounded edge that abuts against it. This rounded edge fits tightly against the shaft, fundamentally solving the problem of the buffer rubber not holding tightly against the shaft and causing it to rotate.
[0039] In summary, the thrust bearing provided by this utility model, by having the second step portion engaged within the second ring surface and a protective sleeve fitted around the outer periphery of the buffer, prevents the buffer from failing to hold tightly against the thrust grinding disc after thermal expansion. Simultaneously, the protective sleeve effectively confines the buffer within its enclosure, allowing it to rotate with the rotor shaft. Specifically, the thrust grinding disc includes a first step portion and a second step portion coaxially arranged. The buffer's interior is hollowed out to form a first ring surface and a second ring surface with a diameter larger than the first ring surface. The diameter of the second step portion is larger than that of the first step portion, allowing the second step portion to engage within the second ring surface, thus enabling the thrust grinding disc to rotate with the buffer. Simultaneously, the protective sleeve is fitted around the outer periphery of the buffer to limit its thermal expansion and deformation. The protective sleeve is also tightly fitted to the rotor shaft, thereby driving the internal thrust grinding disc and buffer to rotate.
[0040] Example 2
[0041] Please refer to 6, which shows a cross-sectional view of a shielded motor rotor provided in Embodiment 2 of this utility model. The shielded motor rotor includes a rotor shaft 400, a rotor assembly 500 disposed on the rotor shaft, a front sliding bearing 600 and a rear sliding bearing 700 disposed at both ends of the rotor assembly, and a thrust bearing 800 as in Embodiment 1.
[0042] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.
[0043] The above-described embodiments are merely illustrative of several implementations of this utility model, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of this utility model patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this utility model, and these all fall within the protection scope of this utility model. Therefore, the protection scope of this utility model patent should be determined by the appended claims.
Claims
1. A thrust bearing, characterized in that, The thrust bearing includes a thrust grinding disc, a buffer clamped on the outer periphery of the thrust grinding disc, and a protective sleeve fitted on the outer periphery of the buffer. A thrust grinding disc, the thrust grinding disc comprising a first step and a second step coaxially arranged; A buffer, wherein the interior of the buffer is hollowed out to form a first ring surface and a second ring surface with a diameter larger than the first ring surface; The second step has a larger diameter than the first step and is fitted into the second ring surface so that the buffer and the thrust grinding disc are tightly fitted together. The protective sleeve is fitted around the outer periphery of the buffer to limit the thermal expansion and deformation of the buffer.
2. The thrust bearing according to claim 1, characterized in that, The inner circumference of the second ring is provided with several limiting posts.
3. The thrust bearing according to claim 2, characterized in that, The second step is provided with a limiting port corresponding to the number and position of the limiting posts, and the limiting port is engaged with the circumferential surface of the limiting posts.
4. The thrust bearing according to claim 1, characterized in that, The buffer has a number of teeth evenly spaced along its arc surface on its outer periphery, and the top of the teeth rests against the inner periphery of the protective sleeve.
5. The thrust bearing according to claim 4, characterized in that, A tooth groove is provided between adjacent tooth peaks.
6. The thrust bearing according to claim 5, characterized in that, The protective sleeve extends toward the buffer and abuts against the rounded edge.
7. A shielded motor rotor, characterized in that, It includes a rotor shaft, a rotor assembly disposed on the rotor shaft, a front sliding bearing and a rear sliding bearing disposed at both ends of the rotor assembly, and a thrust bearing as described in any one of claims 1-6 disposed between the front sliding bearing and the rotor assembly.