A shaft sleeve and electric water pump

Abstract

The utility model provides a shaft sleeve and an electric water pump, which relate to the field of shaft sleeve structure. The shaft sleeve includes: a first guide portion, which is located on the inner wall of the shaft sleeve, and the first guide portion is formed into a spiral structure; and a second guide portion, which is located on the end face of the shaft sleeve in the axial direction, and the second guide portion is connected to the first guide portion. When the shaft sleeve rotates, the coolant inside the shaft sleeve (i.e., in the first guide portion) will be affected by the combined effect of gravity and the thrust of the shaft sleeve operation. The inclination direction of the first guide portion is the same as the direction of the composite force, which can effectively improve the flow capacity of the coolant inside the shaft sleeve, that is, improve the cooling circulation effect, and at the same time can effectively improve the discharge effect of foreign matter in the gap.

Description

Technical Field

[0001] The present application relates to the field of shaft sleeve structures, and in particular to a shaft sleeve and an electric water pump. Background Art

[0002] In the operation of electric water pumps, in order to improve the smoothness of motor operation and reduce noise, the sleeves and shafts of the impeller and rotor are usually set to a clearance fit. However, when the impeller and rotor rotate, the sleeves will rub against the motor shaft and cause high temperature, which can easily cause sleeve ablation, stalling, water pump failure and other risk situations. In addition, due to the small clearance of the sleeve, foreign matter that falls off due to wear is not easy to be discharged when it enters the gap.

[0003] At present, the above-mentioned problem is solved by setting a plurality of guide grooves on the surface of the sleeve and extending along its axis. That is, the circulation of the coolant is realized through the guide grooves to avoid high temperature and discharge foreign matter. However, the guide grooves of this structure only rely on the pressure difference between the motor cavity and the impeller cavity to realize the circulation of the liquid, and the circulation cooling effect is limited, and the effect of discharging foreign matter in the gap is also limited. Utility Model Content

[0004] In view of this, the purpose of the present application is to provide a shaft sleeve and an electric water pump to solve the problem that the structure of the existing shaft sleeve leads to poor circulation cooling effect and poor foreign matter discharge effect.

[0005] According to the above purpose, the first aspect of the utility model provides a shaft sleeve, wherein the shaft sleeve comprises:

[0006] A first guide portion, located on the inner wall of the sleeve, the first guide portion being formed into a spiral structure; and

[0007] The second flow guide portion is located on the end surface of the sleeve in the axial direction, and the second flow guide portion is communicated with the first flow guide portion.

[0008] Preferably, the first guide portion includes a plurality of first guide grooves, each of which extends spirally along the axial direction of the sleeve.

[0009] Preferably, an angle between the first guide groove and the end surface of the sleeve in the axial direction is 75° to 79°.

[0010] Preferably, two ends of each of the first guide grooves in the extension direction respectively penetrate two end surfaces in the axial direction of the sleeve.

[0011] Preferably, the second guide portion includes a plurality of second guide grooves, and each of the second guide grooves is connected to a corresponding first guide groove.

[0012] Preferably, the second guide groove is formed as an arc-shaped structure.

[0013] Preferably, a first end of the second guide groove in the extending direction is communicated with the corresponding first guide groove, and a second end of the second guide groove in the extending direction passes through the side wall of the sleeve.

[0014] Preferably, the end surface of the sleeve in the axial direction is formed into a circular ring structure, and the angle between each of the second guide grooves and the corresponding radius on the end surface is 58° to 62°.

[0015] According to a second aspect of the utility model, an electric water pump is provided, wherein the electric water pump comprises the shaft sleeve as described above.

[0016] According to the shaft sleeve and electric water pump of the present invention, a first guide portion formed as a spiral structure is provided on the inner wall of the shaft sleeve, so that when the shaft sleeve in the present invention rotates, the coolant inside the shaft sleeve (i.e., in the first guide portion) will be affected by the combined action of gravity and the thrust of the shaft sleeve operation, and the inclination direction of the first guide portion is the same as the direction of the composite force, thereby effectively improving the flow capacity of the coolant inside the shaft sleeve, that is, improving the cooling circulation effect; further, the end face of the shaft sleeve of the present invention is also provided with a second guide portion connected to the first guide portion, thereby effectively improving the discharge effect of foreign matter in the gap.

[0017] In order to make the above-mentioned objects, features and advantages of the present application more obvious and easy to understand, preferred embodiments are specifically cited below and described in detail with reference to the attached drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without paying creative work.

[0019] Figure 1 is a schematic diagram of a shaft sleeve according to an embodiment of the utility model;

[0020] Figure 2 is a cross-sectional view of a shaft sleeve according to an embodiment of the utility model;

[0021] Figure 3 It is a top view of a shaft sleeve according to an embodiment of the utility model.

[0022] Icon: 1-sleeve; 11-first guide groove; 12-second guide groove. DETAILED DESCRIPTION

[0023] The following specific embodiments are provided to help the reader obtain a comprehensive understanding of the methods, devices and / or systems described herein. However, after understanding the disclosure of the present application, various changes, modifications and equivalents of the methods, devices and / or systems described herein will be apparent. For example, the order of operations described herein is merely an example, and is not limited to the order set forth herein, but in addition to the operations that must occur in a particular order, changes that will be apparent after understanding the disclosure of the present application may be made. In addition, in order to improve clarity and brevity, descriptions of features known in the art may be omitted.

[0024] The features described herein may be implemented in different forms and should not be interpreted as being limited to the examples described herein. Rather, the examples described herein have been provided only to illustrate some of the many possible ways of implementing the methods, devices and / or systems described herein that will be apparent after understanding the disclosure of the present application.

[0025] Throughout the specification, when an element (such as a layer, a region, or a substrate) is described as being “on”, “connected to”, “bound to”, “over”, or “covering” another element, it may be directly “on”, “connected to”, “bound to”, “over”, or “covering” another element, or one or more other elements may be present between them. In contrast, when an element is described as being “directly on”, “directly connected to”, “directly bound to”, “directly over”, or “directly covering” another element, there may be no other elements present between them.

[0026] As used herein, the term "and / or" includes any one of the associated listed items and any combination of any two or more items.

[0027] Although terms such as "first," "second," and "third" may be used herein to describe various members, components, regions, layers, or portions, these members, components, regions, layers, or portions are not limited by these terms. Rather, these terms are only used to distinguish one member, component, region, layer, or portion from another member, component, region, layer, or portion. Therefore, without departing from the teachings of the examples described herein, the first member, component, region, layer, or portion referred to may also be referred to as the second member, component, region, layer, or portion.

[0028] For ease of description, spatial relational terms such as "above", "upper", "below", and "lower" may be used herein to describe the relationship of one element to another element as shown in the accompanying drawings. Such spatial relational terms are intended to include different orientations of the device in use or operation in addition to the orientation depicted in the accompanying drawings. For example, if the device in the accompanying drawings is turned over, an element described as being "above" or "upper" relative to another element will subsequently be "below" or "lower" relative to the other element. Therefore, the term "above" includes both "above" and "below" orientations depending on the spatial orientation of the device. The device may also be positioned in other ways (e.g., rotated 90 degrees or in other orientations), and the spatial relational terms used herein will be interpreted accordingly.

[0029] The terms used herein are only used to describe various examples and are not used to limit the present disclosure. Unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. The terms "include", "comprise" and "have" list the stated features, quantities, operations, components, elements and / or their combinations that exist, but do not exclude the existence or addition of one or more other features, quantities, operations, components, elements and / or their combinations.

[0030] Variations in the shapes shown in the drawings may occur due to manufacturing techniques and / or tolerances. Therefore, the examples described herein are not limited to the specific shapes shown in the drawings but include variations in shapes that occur during manufacturing.

[0031] The features of the examples described herein may be combined in various ways that will be apparent after understanding the disclosure of the present application. In addition, although the examples described herein have various configurations, other configurations are possible as will be apparent after understanding the disclosure of the present application.

[0032] According to a first aspect of the utility model, a shaft sleeve is provided, such as Figures 1 to 3 As shown, the sleeve 1 in this embodiment is provided with a first guide portion and a second guide portion which are connected to each other, through which efficient circulation of the coolant can be achieved to avoid the generation of high temperature; and foreign matter located in the gap of the sleeve 1 can also be efficiently discharged. It should be noted that the above-mentioned sleeve 1 gap refers to the fitting gap between the sleeve 1 and the corresponding shaft. In the following, the specific structure of the above-mentioned parts of the sleeve according to the utility model will be described in detail.

[0033] In this embodiment, the sleeve 1 is formed into a cylindrical structure with an axis, and is formed with through holes penetrating both ends of the axis, so that the cross section of the sleeve 1 (the cross section is perpendicular to the axis of the sleeve 1) is formed into a ring structure, so that the technical effect of being sleeved on the outer wall of the corresponding shaft can be achieved. The first guide portion is arranged on the inner wall of the sleeve 1 and is formed into a spiral structure. Specifically, as Figure 2 As shown, the first guide portion includes a plurality of first guide grooves 11, each of which extends spirally along the axial direction of the sleeve 1, so that the first guide portion is formed into a spiral structure; in addition, both ends of the extension direction of each first guide groove 11 respectively penetrate the two end surfaces of the axial direction of the sleeve 1 to facilitate the discharge of foreign matter and the circulation of coolant.

[0034] It should be noted that there is no specific limit on the number of the first guide grooves 11. For example, three first guide grooves 11 are provided in this embodiment. In addition, when the sleeve 1 rotates, the coolant in the first guide portion will be affected by the combined effect of gravity and the thrust of the sleeve 1, and the inclination direction of the first guide groove 11 should be the same as the direction of the above-mentioned composite force, so that the flow capacity of the coolant in the first guide portion can be effectively improved, thereby further improving the cooling circulation effect of the coolant. Preferably, the angle A between the first guide groove 11 and the end face of the sleeve 1 in the axial direction (equivalent to the thread lead angle of the thread) is 75° to 79°, which is the optimal range for achieving the above-mentioned technical effect after multiple tests.

[0035] In this embodiment, if Figure 3 As shown, the second guide portion is arranged on the end face of the sleeve 1 in the axial direction. The second guide portion includes a plurality of second guide grooves 12, each of which is respectively connected to the first guide groove 11, that is, the second guide grooves 12 correspond to the first guide grooves 11 one by one; further, the first end of the second guide groove 12 in the extension direction is connected to the corresponding first guide groove 11, and the second end of the second guide groove 12 in the extension direction passes through the side wall of the sleeve 1; in this way, the smoothness of the discharge of foreign matter can be effectively increased.

[0036] More specifically, the second guide groove 12 is formed into an arc-shaped structure, so that it can better adapt to the rotation of the sleeve 1, that is, under the action of centrifugal force, the second guide groove 12 with an arc-shaped structure can be more conducive to the flow of coolant, and thus more conducive to the discharge of foreign matter. From the above content, it can be seen that the end face of the sleeve 1 in the axial direction is formed into a circular ring structure. Preferably, the angle B between each second guide groove 12 and the corresponding radius on the end face is 58° to 62°. This value is the optimal range that can achieve the above technical effect after multiple tests.

[0037] It should be noted that the sleeve 1 is only provided with the second guide portion as described above at one end in the axial direction thereof. When the sleeve 1 is assembled with other components accordingly, the end face where the second guide portion is located is closer to the center of the electric water pump than the other end face.

[0038] According to the shaft sleeve of the utility model, a first guide portion formed into a spiral structure is arranged at the inner wall of the shaft sleeve 1, so that when the shaft sleeve 1 in the utility model rotates, the coolant inside the shaft sleeve 1 (i.e., in the first guide portion) will be affected by the combined action of gravity and the operating thrust of the shaft sleeve 1, and the inclination direction of the first guide portion is the same as the direction of the composite force, which can effectively improve the flow capacity of the coolant inside the shaft sleeve 1, that is, improve the cooling circulation effect, so as to better achieve the cooling of the stator, rotor and controller of the electric water pump; further, by arranging a second guide portion connected to the first guide portion on the end face of the shaft sleeve 1, it is also possible to effectively improve the discharge effect of foreign matter in the gap, that is, effectively reduce the risk of motor jamming.

[0039] According to a second aspect of the utility model, an electric water pump is provided, wherein the electric water pump comprises the shaft sleeve as described above.

[0040] Finally, it should be noted that the above-described embodiments are only specific implementation methods of the present application, which are used to illustrate the technical solutions of the present application, rather than to limit them. The protection scope of the present application is not limited thereto. Although the present application is described in detail with reference to the above-described embodiments, ordinary technicians in the field should understand that any technician familiar with the technical field can still modify the technical solutions recorded in the above-described embodiments within the technical scope disclosed in the present application, or can easily think of changes, or make equivalent replacements for some of the technical features therein; and these modifications, changes or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present application, and should be included in the protection scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.

Claims

1. A bushing, characterized in that: The shaft sleeve comprises: A first flow guide portion, located on the inner wall of the sleeve, wherein the first flow guide portion is formed into a spiral structure; as well as The second flow guide portion is located on the end surface of the sleeve in the axial direction, and the second flow guide portion is communicated with the first flow guide portion.

2. The sleeve according to claim 1, characterized in that: The first guide portion includes a plurality of first guide grooves, and each of the first guide grooves extends spirally along the axial direction of the sleeve.

3. The sleeve according to claim 2, characterized in that: The included angle between the first guide groove and the end surface of the sleeve in the axial direction is 75° to 79°.

4. The sleeve according to claim 2, characterized in that: Both ends of each of the first guide grooves in the extension direction respectively penetrate through two end surfaces of the sleeve in the axial direction.

5. The sleeve according to claim 4, characterized in that: The second guide portion includes a plurality of second guide grooves, and each of the second guide grooves is connected to the first guide groove respectively.

6. The sleeve according to claim 5, characterized in that: The second guide groove is formed into an arc-shaped structure.

7. The sleeve according to claim 5, characterized in that: A first end of the second guide groove in an extending direction is communicated with the corresponding first guide groove, and a second end of the second guide groove in an extending direction passes through a side wall of the sleeve.

8. The sleeve according to claim 5, characterized in that: The end surface of the sleeve in the axial direction is formed into a circular ring structure, and the angle between each of the second guide grooves and the corresponding radius on the end surface is 58° to 62°.

9. An electric water pump, characterized in that: The electric water pump comprises a bushing as claimed in any one of claims 1 to 8.

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