Micro motors and power devices

Abstract

The utility model relates to a micro motor and a power device, wherein the micro motor comprises a housing, a rotating shaft, an end cover and a dynamic sealing element. During use, the rotating shaft can smoothly rotate relative to the housing and the end cover around the axis to output rotational driving kinetic energy to the outside. In addition, by arranging a dynamic sealing element between the end cover and the rotating shaft, and utilizing the dynamic seal cooperation between the dynamic sealing element and the outer wall of the rotating shaft, biological tissue fluid is prevented from entering the housing through the gap between the rotating shaft and the end cover, thereby preventing the internal parts of the micro motor from being soaked in the biological tissue fluid and causing rust or jamming, thereby extending the service life of the micro motor.

Description

Technical Field

[0001] The utility model relates to the technical field of power devices, in particular to a micro motor and a power device. Background Art

[0002] Micromotors have the advantages of small size, high speed, light weight, and no cogging torque, and are often used in handheld surgical power devices. Due to the small size of micromotors, their shafts are also designed to be relatively slender, so the existing shafts are usually set as solid structures. Some power devices, such as planing surgical equipment, require tissue suction while treating the lesion tissue. In order to facilitate smooth tissue suction, a concept of improving the shaft to a hollow structure to circulate tissue is proposed.

[0003] However, when verifying the design of the above concept, it was found that during the process of the planing surgical equipment sucking tissue from the lesion through the hollow structure of the rotating shaft, tissue fluid could easily penetrate into the micromotor, causing problems such as rust or jamming inside the micromotor, thus affecting the service life of the micromotor. Utility Model Content

[0004] Based on this, it is necessary to provide a micromotor and a power device to address the problem that rust or jamming easily occurs inside the micromotor.

[0005] The technical solution is as follows:

[0006] In one aspect, a micromotor is provided, comprising:

[0007] a housing having opposite ends;

[0008] A rotating shaft, wherein a flow channel is formed through the rotating shaft in the axial direction, and the rotating shaft portion is rotatably disposed in the housing;

[0009] an end cover, the end cover being disposed at one end of the housing and connected to the housing, the end cover being provided with a mounting cavity for the rotating shaft to pass through; and

[0010] A dynamic sealing element is fixedly arranged in the installation cavity and dynamically seals with the outer peripheral side of the rotating shaft.

[0011] The technical solution is further described below:

[0012] In one of the embodiments, a mounting portion is radially protruded from the inner side wall of the mounting cavity, and a portion of the end surface of the dynamic sealing element close to the housing is in abutment with the end surface of the mounting portion.

[0013] In one of the embodiments, the end surface of the dynamic sealing element away from the housing is flush with the end surface of the end cover away from the housing.

[0014] In one embodiment, the end cover is provided with a first limiting portion, and the dynamic sealing element is provided with a second limiting portion that cooperates with the first limiting portion to limit the circumferential rotation of the dynamic sealing element relative to the end cover.

[0015] In one embodiment, the first limiting portion is provided with a limiting groove, and the second limiting portion is provided with a limiting protrusion, and the limiting protrusion is engaged with the limiting groove.

[0016] In one embodiment, there are at least two first limiting portions, and at least two first limiting portions are arranged at intervals around the circumference of the end cover; and there are correspondingly at least two second limiting portions, and at least two first limiting portions are arranged in one-to-one correspondence with at least two second limiting portions.

[0017] In one embodiment, the outer wall of the dynamic sealing element is interference fit with the inner wall of the installation cavity, and the inner wall of the dynamic sealing element is provided with an elastic convex ring, and the elastic convex ring is in contact with and fits the outer peripheral side of the rotating shaft.

[0018] In one embodiment, there are at least two elastic convex rings, and at least two of the elastic convex rings are spaced apart along the axial direction of the rotating shaft.

[0019] In one embodiment, the axial thickness of the elastic convex ring decreases gradually along the radial direction of the rotating shaft approaching the rotating shaft.

[0020] On the other hand, a power device is provided, comprising an actuator and the micromotor, wherein the micromotor is transmission-connected to the actuator to drive the actuator to rotate.

[0021] In the micro-motor and power device of the above embodiment, during use, the rotating shaft can smoothly rotate relative to the housing and the end cover around the axis to output rotational driving kinetic energy to the outside. In addition, by arranging a dynamic sealing element between the end cover and the rotating shaft, the dynamic sealing element is used to cooperate with the outer wall of the rotating shaft to prevent biological tissue fluid from entering the housing through the gap between the rotating shaft and the end cover, thereby preventing the internal parts of the micro-motor from being soaked in biological tissue fluid and causing rust or jamming, thereby extending the service life of the micro-motor. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] The drawings constituting a part of the present application are used to provide a further understanding of the present invention. The illustrative embodiments of the present invention and the description thereof are used to explain the present invention and do not constitute an improper limitation on the present invention.

[0023] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0024] Figure 1 A schematic structural diagram of a micromotor according to an embodiment from one perspective;

[0025] Figure 2 for Figure 1 A cross-sectional view of the micromotor AA;

[0026] Figure 3 for Figure 1 A schematic diagram of the structure of the micromotor from another perspective;

[0027] Figure 4 for Figure 1 A schematic diagram of the structure of the end cover of the micromotor;

[0028] Figure 5 for Figure 1 Schematic diagram of the structure of the dynamic sealing element of the micromotor.

[0029] Description of reference numerals:

[0030] 10. micromotor; 100. housing; 200. rotating shaft; 210. circulation channel; 300. end cover; 310. mounting cavity; 320. mounting portion; 330. limiting groove; 400. dynamic sealing element; 410. elastic convex ring. DETAILED DESCRIPTION

[0031] In order to make the above-mentioned purposes, features and advantages of the utility model more obvious and easy to understand, the specific implementation methods of the utility model are described in detail below in conjunction with the accompanying drawings. In the following description, many specific details are set forth to facilitate a full understanding of the utility model. However, the utility model can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without violating the connotation of the utility model, so the utility model is not limited by the specific embodiments disclosed below.

[0032] In one embodiment, a power device is provided, including an actuator (not shown) and a micromotor 10. The micromotor 10 and the actuator are connected to each other by plugging or snapping, so that the micromotor 10 drives the actuator to rotate as power output, so as to stably and reliably drive the surgical tool to perform corresponding operations.

[0033] The surgical tool may be a hollow tool such as a planer, which is not limited here.

[0034] like Figures 1 to 5 As shown, in one embodiment, a micro motor 10 is provided, including a housing 100 , a rotating shaft 200 , an end cover 300 and a dynamic sealing element 400 .

[0035] like Figures 1 to 3 As shown, the housing 100 has two opposite ends, and the housing 100 can be used as the main body of the entire micromotor 10. The interior of the housing 100 can accommodate the rotor, stator and other components of the micromotor 10. The housing 100 can adopt an existing structure, which will not be repeated here.

[0036] like Figures 1 to 3 As shown, the shaft 200 is provided with a flow channel 210 along the axial direction, thereby connecting to the suction channel of the hollow part of the surgical tool, so that the biological tissue fluid can be transported through the flow channel 210. Optionally, the flow channel 210 penetrates the opposite ends of the shaft 200 along the axial direction of the shaft 200, so as to facilitate the smooth transportation of the biological tissue fluid. In addition, the shaft 200 is partially rotatably arranged in the housing 100, so as to be able to output the rotational driving kinetic energy to the outside.

[0037] It should be noted that the rotation of the rotating shaft 200 can be achieved by components such as a rotor and a bearing, and no limitation is made here.

[0038] like Figures 1 to 3 As shown, the end cover 300 is disposed at one end of the housing 100 and is assembled and connected with the housing 100 by means of a snap connection or the like, so that the end cover 300 is used to encapsulate one end of the housing 100. In addition, the end cover 300 is provided with a mounting cavity 310 for the rotating shaft 200 to pass through, so that one end of the rotating shaft 200 extends out of the mounting cavity 310 to be transmission-connected with the actuator.

[0039] In actual use, the end cover 300 can be used to realize the assembly connection with the external structure to achieve the transmission connection between the rotating shaft 200 and the actuator.

[0040] The central axis of the installation cavity 310 may be colinear with the central axis of the flow channel 210 .

[0041] like Figure 2 and Figure 3 As shown, the dynamic sealing element 400 is fixedly installed in the installation cavity 310 and dynamically seals with the outer peripheral side of the rotating shaft 200, that is, the dynamic sealing element 400 is fixedly installed in the installation cavity 310, and the dynamic sealing element 400 and the outer peripheral side wall of the rotating shaft 200 are sealed, and the dynamic sealing element 400 will not affect the rotation of the rotating shaft 200 relative to the housing 100.

[0042] Optionally, the dynamic sealing element 400 may be in the form of a sealing sleeve or the like.

[0043] It should be noted that the dynamic sealing element 400 of the embodiment of the present application is fixed in the installation cavity 310, and can be assembled in a detachable manner or in a non-detachable manner, and can be flexibly adjusted or designed according to actual usage conditions.

[0044] In the micromotor 10 of the above embodiment, during use, the rotating shaft 200 can smoothly rotate around the axial direction relative to the housing 100 and the end cover 300 to output the rotational driving kinetic energy to the outside. In addition, by arranging the dynamic sealing element 400 between the end cover 300 and the rotating shaft 200, the dynamic sealing cooperation between the dynamic sealing element 400 and the outer wall of the rotating shaft 200 is utilized to prevent the biological tissue fluid from entering the housing 100 through the gap between the rotating shaft 200 and the end cover 300, thereby preventing the internal parts of the micromotor 10 from being soaked in the biological tissue fluid and causing rust or jamming, thereby extending the service life of the micromotor 10.

[0045] like Figure 2 and Figure 4 As shown, in one embodiment, the inner side wall of the installation cavity 310 is radially convexly provided with an installation portion 320, wherein the installation portion 320 may be in the form of an installation flange, etc., and the end surface of the dynamic sealing element 400 close to the housing 100 is in abutment with the end surface of the installation portion 320. In this way, when the dynamic sealing element 400 is installed in the installation cavity 310, the installation portion 320 and the dynamic sealing element 400 can be in abutment with each other to accurately install the dynamic sealing element 400 and limit the position, thereby ensuring the assembly accuracy between the dynamic sealing element 400 and the end cover 300, and further ensuring the sealing performance. In addition, the abutment and fit between the dynamic sealing element 400 and the installation portion 320 increases the contact area between the dynamic sealing element 400 and the end cover 300, which can effectively improve the sealing effect between the dynamic sealing element 400 and the end cover 300, and the fitting part between the dynamic sealing element 400 and the end cover 300 occurs not only in the axial direction of the installation cavity 310, but also in the radial direction of the installation cavity 310, which can also effectively improve the sealing effect.

[0046] like Figures 1 to 3 As shown, further, the end surface of the dynamic sealing element 400 away from the housing 100 is flush with the end surface of the end cover 300 away from the housing 100. In this way, when the dynamic sealing element 400 is installed in the installation cavity 310, when one side of the dynamic sealing element 400 contacts the installation portion 320, the other side of the dynamic sealing element 400 is flush with the end cover 300, so as to avoid the dynamic sealing element 400 being exposed outside the installation cavity 310 and being deformed by external forces to affect the sealing effect. In addition, it will not interfere with or affect the assembly connection between the end cover 300 and the external structure.

[0047] In one embodiment, the end cover 300 is provided with a first limiting portion, and the dynamic sealing element 400 is provided with a second limiting portion. The second limiting portion cooperates with the first limiting portion to limit the circumferential rotation of the dynamic sealing element 400 relative to the end cover 300, thereby ensuring the sealing performance between the dynamic sealing element 400 and the end cover 300, and also helping to extend the service life of the dynamic sealing element 400.

[0048] The limiting cooperation between the first limiting portion and the second limiting portion can be achieved by a snap-fitting manner or a plug-in fitting manner, as long as it can limit the circumferential rotation of the dynamic sealing element 400 relative to the end cover 300.

[0049] like Figure 3 and Figure 4 As shown, in one embodiment, the first limit portion is provided with a limit groove 330, and the second limit portion is provided with a limit protrusion, and the limit protrusion is snap-fitted with the limit groove 330. In this way, the dynamic sealing element 400 is limited from rotating relative to the end cover 300 by the snap-fitting between the limit protrusion and the limit groove 330.

[0050] Specifically, a limiting groove 330 is provided on the end surface of the end cover 300 facing away from the housing 100 , and a limiting protrusion is provided on the dynamic sealing element 400 corresponding to the limiting groove 330 .

[0051] In one embodiment, at least two first limiting parts are provided, and at least two first limiting parts are arranged at intervals around the circumference of the end cover 300; at least two second limiting parts are correspondingly provided, and at least two first limiting parts are arranged one-to-one correspondingly with at least two second limiting parts. In this way, the dynamic sealing element 400 is subjected to uniform circumferential torque, and deformation of the dynamic sealing element 400 due to uneven force is avoided, thereby ensuring sealing performance.

[0052] The specific number of the first limiting portion and the second limiting portion can be flexibly designed or adjusted according to actual usage, for example, it can be two, three or more.

[0053] In one embodiment, the outer wall of the dynamic sealing element 400 and the inner wall of the installation cavity 310 are interference-fitted, so that the dynamic sealing element 400 and the end cover 300 can achieve stable and reliable sealing, preventing biological tissue fluid from entering the housing 100 through the gap between the dynamic sealing element 400 and the end cover 300, thereby preventing the internal parts of the micromotor 10 from being soaked in biological tissue fluid and causing rust or jamming, thereby extending the service life of the micromotor 10. Figure 2 and Figure 5As shown, the inner wall of the dynamic sealing element 400 is provided with an elastic convex ring 410, and the elastic convex ring 410 is in contact with the outer peripheral side of the rotating shaft 200, so as to utilize the elastic deformation of the elastic convex ring 410 to achieve stable and reliable sealing cooperation with the outer peripheral side wall of the rotating shaft 200, which not only does not affect the rotation of the rotating shaft 200, but also prevents biological tissue fluid from entering the housing 100 through the gap between the dynamic sealing element 400 and the rotating shaft 200, thereby preventing the internal parts of the micromotor 10 from being soaked in biological tissue fluid and causing rust or jamming, thereby extending the service life of the micromotor 10.

[0054] The elastic convex ring 410 can be made of materials such as rubber or silicone.

[0055] In one embodiment, there are at least two elastic convex rings 410, and at least two elastic convex rings 410 are arranged at intervals along the axial direction of the rotating shaft 200. In this way, the dynamic sealing effect between the dynamic sealing element 400 and the rotating shaft 200 can be effectively ensured by the at least two elastic convex rings 410 both contacting and fitting with the outer peripheral side of the rotating shaft 200.

[0056] like Figure 2 and Figure 5 As shown, in one embodiment, the axial thickness of the elastic protruding ring 410 (eg Figure 2 In the radial direction of the rotating shaft 200, the elastic convex ring 410 decreases in the direction close to the rotating shaft 200. In this way, the elastic convex ring 410 can achieve stable and reliable sealing cooperation with the rotating shaft 200, and at the same time, a small area of ​​surface contact and a form close to line contact can be achieved, which can effectively avoid interference or influence on the rotation of the rotating shaft 200 and reduce the kinetic energy loss of the rotating shaft 200.

[0057] The axial thickness of the elastic protruding ring 410 refers to the width of the elastic protruding ring 410 in the axial direction of the rotating shaft 200 .

[0058] It should be noted that "some body" or "some part" can be a part of the corresponding "component", that is, "some body" or "some part" can be integrally formed with the "other parts of the component"; it can also be an independent component that can be separated from the "other parts of the component", that is, "some body" or "some part" can be manufactured independently and then combined with the "other parts of the component" into a whole. The expression of the above-mentioned "some body" or "some part" in this application is only one of the embodiments, for the convenience of reading, and not to limit the scope of protection of this application. As long as it contains the above-mentioned features and has the same function, it should be understood as an equivalent technical solution of this application.

[0059] It should be noted that the components included in the "unit", "assembly", "mechanism" and "device" of this application can also be flexibly combined, that is, modular production can be carried out according to actual needs to facilitate modular assembly. The division of the above components in this application is only one of the embodiments, for the convenience of reading, and not to limit the scope of protection of this application. As long as the above components are included and have the same functions, it should be understood that it is an equivalent technical solution of this application.

[0060] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying 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 present invention. The term "and / or" used in the present invention includes any and all combinations of one or more related listed items.

[0061] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present utility model, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0062] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0063] In the present utility model, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0064] It should be noted that when an element is referred to as being "fixed on", "set on", "fixed on" or "installed on" another element, it can be directly on the other element or there can be a central element. When an element is considered to be "connected" to another element, it can be directly connected to the other element or there can be a central element at the same time. Further, when an element is considered to be "fixed transmission connected" to another element, the two can be fixed in a detachable connection manner or in a non-detachable connection, as long as power transmission can be achieved, such as socketing, snap-on, one-piece molding fixation, welding, etc., which can be achieved in the prior art and will not be repeated here. When an element is perpendicular or approximately perpendicular to another element, it means that the ideal state of the two is vertical, but due to the influence of manufacturing and assembly, there may be a certain vertical error. The terms "vertical", "horizontal", "left", "right" and similar expressions used herein are for illustrative purposes only and do not represent the only implementation method. The term "and / or" used herein includes any and all combinations of one or more related listed items.

[0065] It should also be understood that when explaining the connection relationship or positional relationship of elements, although not explicitly described, the connection relationship and positional relationship are interpreted as including an error range, which should be within the acceptable deviation range of a specific value determined by those skilled in the art. For example, "approximately", "approximately" or "substantially" may mean within one or more standard deviations, which are not limited here.

[0066] The technical features of the above embodiments may be combined arbitrarily. To make the description concise, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0067] The above embodiments only express several implementation methods of the utility model, and the descriptions are relatively specific and detailed, but they cannot be understood as limiting the scope of the utility model patent. It should be pointed out that for ordinary technicians in this field, several modifications and improvements can be made without departing from the concept of the utility model, which all belong to the protection scope of the utility model. Therefore, the protection scope of the utility model patent shall be based on the attached claims.

Claims

1. A micromotor, characterized in that: include: a housing having opposite ends; A rotating shaft, wherein a flow channel is formed through the rotating shaft in the axial direction, and the rotating shaft portion is rotatably disposed in the housing; an end cover, the end cover being disposed at one end of the housing and connected to the housing, the end cover being provided with a mounting cavity for the rotating shaft to pass through; and A dynamic sealing element is fixedly arranged in the installation cavity and dynamically seals with the outer peripheral side of the rotating shaft.

2. The micromotor according to claim 1, characterized in that: An installation portion is radially protruded on the inner side wall of the installation cavity, and a portion of the end surface of the dynamic sealing element close to the housing is in abutment with the end surface of the installation portion.

3. The micromotor according to claim 1, characterized in that: The end surface of the dynamic sealing element away from the housing is flush with the end surface of the end cover away from the housing.

4. The micromotor according to claim 1, characterized in that: The end cover is provided with a first limiting portion, and the dynamic sealing element is provided with a second limiting portion that cooperates with the first limiting portion to limit the circumferential rotation of the dynamic sealing element relative to the end cover.

5. The micromotor according to claim 4, characterized in that: The first limiting portion is provided with a limiting groove, and the second limiting portion is provided with a limiting protrusion, and the limiting protrusion is engaged with the limiting groove.

6. The micromotor according to claim 4, characterized in that: There are at least two first limiting portions, and at least two of the first limiting portions are arranged at intervals around the circumference of the end cover; there are correspondingly at least two second limiting portions, and at least two of the first limiting portions are arranged in a one-to-one correspondence with at least two of the second limiting portions.

7. The micromotor according to any one of claims 1 to 6, characterized in that: The outer side wall of the dynamic sealing element is interference-fitted with the inner side wall of the installation cavity. The inner side wall of the dynamic sealing element is provided with an elastic convex ring, and the elastic convex ring is in contact with and fits the outer peripheral side of the rotating shaft.

8. The micromotor according to claim 7, characterized in that: There are at least two elastic convex rings, and at least two of the elastic convex rings are arranged at intervals along the axial direction of the rotating shaft.

9. The micromotor according to claim 7, characterized in that: The axial thickness of the elastic convex ring decreases gradually in the radial direction of the rotating shaft along the direction approaching the rotating shaft.

10. A power device, characterized in that: It comprises an actuator and the micromotor according to any one of claims 1 to 9, wherein the micromotor is transmission-connected to the actuator to drive the actuator to rotate.

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