CN213839553U - Magnetic liquid sealing device - Google Patents
Magnetic liquid sealing device Download PDFInfo
- Publication number
- CN213839553U CN213839553U CN202022481598.4U CN202022481598U CN213839553U CN 213839553 U CN213839553 U CN 213839553U CN 202022481598 U CN202022481598 U CN 202022481598U CN 213839553 U CN213839553 U CN 213839553U
- Authority
- CN
- China
- Prior art keywords
- rotating shaft
- magnetic
- hole
- liquid
- sealing
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Landscapes
- Sealing Using Fluids, Sealing Without Contact, And Removal Of Oil (AREA)
Abstract
The utility model discloses a magnetic liquid sealing device, magnetic liquid sealing device includes casing, pivot and liquid container, the cavity has in the casing, the bottom of casing is equipped with first through-hole, first through-hole with the cavity intercommunication, the pivot is worn to establish on the casing, the pivot for the casing is followed the circumference of pivot is rotatable, the lower extreme of pivot passes through first through-hole stretches out the casing, the outer peripheral face of pivot with spaced apart in order to form the seal clearance between the internal face of first through-hole, the magnetic liquid has been held in the liquid container, the liquid container is located the below of casing, the lower extreme submergence of pivot is in the magnetic liquid is internal, the magnetic liquid be suitable for along the outer peripheral face of pivot climbs in the seal clearance. The utility model discloses magnetic liquid sealing device's magnetic liquid pours into simply, swiftly, and magnetic liquid can reduce the friction to the countershaft.
Description
Technical Field
The utility model relates to a sealed technical field specifically, relates to a magnetic liquid sealing device.
Background
In some transmission configurations, it is desirable to seal the internal components against dust. In the related art, friction is generated between the dust seal and the rotating shaft, so that the rotating shaft is abraded on one hand, and the dust seal generates abrasive particles on the other hand, and the generated abrasive particles can pollute a sealed component. Although the related art also utilizes magnetic liquid to perform dust sealing, the injection difficulty of the magnetic liquid is high, and meanwhile, when the shaft is made of a non-magnetic conductive material, the problem of poor sealing is easily caused, so that the application range of the magnetic liquid dust sealing is greatly limited.
SUMMERY OF THE UTILITY MODEL
The present invention aims at solving at least one of the technical problems in the related art to a certain extent.
Therefore, the embodiment of the utility model provides a magnetic fluid sealing device, this magnetic fluid sealing device's magnetic fluid injection is simple, swift, and magnetic fluid can reduce the friction to the countershaft, can not produce the grit moreover, and then avoids polluting the subassembly that is sealed, has enlarged the range of application of magnetic fluid dust seal simultaneously.
According to the utility model discloses magnetic liquid sealing device includes: the shell is internally provided with a cavity, the bottom of the shell is provided with a first through hole, and the first through hole is communicated with the cavity; the rotating shaft penetrates through the shell in the vertical direction, at least part of the rotating shaft is positioned in the cavity, the rotating shaft can rotate relative to the shell along the circumferential direction of the rotating shaft, the lower end of the rotating shaft extends out of the shell through the first through hole, and the outer circumferential surface of the rotating shaft and the inner wall surface of the first through hole are spaced to form a sealing gap; and the liquid container is used for containing magnetic liquid, the liquid container is positioned below the shell, the lower end of the rotating shaft extends into the liquid container from the top of the liquid container, the lower end of the rotating shaft is immersed in the magnetic liquid, and the magnetic liquid is suitable for climbing into the sealing gap along the peripheral surface of the rotating shaft.
According to the utility model discloses magnetic liquid sealing device, when the pivot rotated, under the effect of high-shear, magnetic liquid can climb in the seal clearance along the outer peripheral face of pivot. The utility model discloses magnetic liquid sealing device's magnetic liquid pours into simply, swiftly. The magnetic liquid climbing into the sealing gap can seal the cavity. The magnetic liquid can reduce friction on the rotating shaft, and abrasive particles can not be generated, so that the sealed components in the cavity are prevented from being polluted.
In some embodiments, the liquid container has a second through hole at a top thereof, and a gap is provided between an inner wall surface of the second through hole and an outer circumferential surface of the rotating shaft.
In some embodiments, the liquid container has a gap between a top end surface of the liquid container and a bottom end surface of the housing.
In some embodiments, the material of the shaft may be a non-magnetic material.
In some embodiments, the magnetic liquid sealing device further includes a sealing ring, the sealing ring is sleeved on the rotating shaft, the sealing ring is located between an inner wall surface of the first through hole and an outer circumferential surface of the rotating shaft, the outer circumferential surface of the sealing ring is connected with the inner wall surface of the first through hole, and the sealing gap is formed between an inner circumferential surface of the sealing ring and the outer circumferential surface of the rotating shaft.
In some embodiments, the sealing ring is a magnetic ring, and the magnetic liquid climbing into the sealing gap is adapted to be attracted into the sealing gap under the magnetic force of the sealing ring.
In some embodiments, the material of the sealing ring is a permanent magnetic material or a magnetic rubber.
In some embodiments, the housing includes a cylindrical member, the cavity is formed in the cylindrical member, and an end cap having a third through hole, an outer peripheral wall of the end cap is connected to an inner wall surface of the first through hole, and an inner wall surface of the third through hole is connected to an outer peripheral surface of the seal ring.
In some embodiments, the magnetic fluid seal further comprises a first component located within the cavity, the first component being sleeved on the shaft.
In some embodiments, the top of the barrel has a flange with spaced apart attachment holes.
Drawings
Fig. 1 is a schematic view of a magnetic liquid seal device according to an embodiment of the present invention.
Fig. 2 is a schematic view of the magnetic liquid sealing apparatus in fig. 1, and the magnetic liquid is not shown.
Fig. 3 is a schematic view of the housing of fig. 1.
Reference numerals:
a housing 100; a cylindrical member 101; a first through-hole 102; a fourth through hole 103; a cavity 120; a flange 130; a connection hole 131; an end cap 140; a third through hole 141; a seal ring 150; a seal gap 151; a rotating shaft 200; a first component 300; a liquid container 400; a second through hole 401; a magnetic liquid 500; a first portion 510; a second portion 520; a third portion 530.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings. The embodiments described below with reference to the drawings are exemplary and intended to be used for explaining the present invention, and should not be construed as limiting the present invention.
As shown in fig. 1 to 3, a magnetic liquid sealing apparatus according to an embodiment of the present invention includes a housing 100, a first member 300, a rotation shaft 200, a sealing ring 150, and a liquid container 400.
As shown in fig. 3, the housing 100 has a cavity 120 therein, and the bottom of the housing 100 is provided with a first through hole 102, and the first through hole 102 is communicated with the cavity 120.
As shown in fig. 1-3, the housing 100 includes a cylindrical member 101 and an end cap 140. The cavity 120 is formed in the cylindrical member 101, the first component 300 is a sealed component, the first component 300 is located in the cavity 120, and the first component 300 is sleeved on the rotating shaft 200. The end cap 140 has a third through hole 141, and the outer peripheral wall of the end cap 140 is connected to the inner wall surface of the first through hole 102, and the third through hole 141 is located in the first through hole 102. The top of the housing 100 has a fourth through hole 103.
Further, as shown in fig. 1 to 3, the cylindrical member 101 has a flange 130, the flange 130 is located on the outer circumferential surface of the rotating shaft 200, and the flange 130 has connection holes 131 arranged at intervals so that the housing 100 is fixed by the flange 130.
As shown in fig. 1 and 2, the rotating shaft 200 is vertically inserted into the casing 100, and at least a portion of the rotating shaft 200 is located in the cavity 120, and the rotating shaft 200 is rotatable relative to the casing 100 along a circumferential direction of the rotating shaft 200. The upper end of the rotation shaft 200 penetrates through the fourth through hole 103, and the lower end of the rotation shaft 200 extends out of the third through hole 141. The outer circumferential surface of the rotation shaft 200 is spaced apart from the inner wall surface of the third through hole 141 to form a sealing gap 151.
As shown in fig. 1, a magnetic liquid 500 is contained in a liquid container 400, the liquid container 400 is located below a housing 100, a lower end of a rotating shaft 200 extends into the liquid container 400 from the top of the liquid container 400, and the lower end of the rotating shaft 200 is immersed in the magnetic liquid 500. That is, the liquid level of the magnetic liquid 500 in the liquid container 400 is higher than the lower end surface of the rotation shaft 200. When the rotating shaft 200 rotates, the magnetic liquid 500 can climb into the seal gap 151 along the outer peripheral surface of the rotating shaft 200.
According to the embodiment of the present invention, the rotating shaft 200 rotates along the circumferential direction of the rotating shaft 200 relative to the casing 100, and the magnetic liquid 500 is a liquid having viscoelasticity. According to the wilenberg effect, when the rotating shaft 200 rotates, the magnetic liquid 500 can climb into the seal gap 151 along the outer circumferential surface of the rotating shaft 200 under the action of high shear. Therefore, the magnetic liquid 500 of the magnetic liquid sealing device provided by the embodiment of the utility model is injected simply and quickly. The magnetic liquid 500 can reduce friction against the rotating shaft 200 without generating abrasive particles, thereby preventing contamination of the sealed components in the cavity 120.
As shown in fig. 1 and 2, the liquid container 400 has a second through hole 401 at the top thereof, and a gap is provided between the inner wall surface of the second through hole 401 and the outer peripheral surface of the rotating shaft 200. The magnetic liquid 500 in the liquid container 400 can thereby climb up along the outer circumferential surface of the rotating shaft 200 through the gap between the inner wall surface of the second through hole 401 and the outer circumferential surface of the rotating shaft 200, so that the magnetic liquid 500 is injected into the seal gap 151.
As shown in fig. 1 and 2, a gap is provided between the top end surface of the liquid container 400 and the bottom end surface of the housing 100. The inner cavity of the liquid container 400 can thereby communicate with the outside through the gap between the inner wall surface of the second through hole 401 and the outer peripheral surface of the rotating shaft 200 and the gap between the top end surface of the liquid container 400 and the bottom end surface of the housing 100, and the air pressure inside the liquid container 400 can be made the same as the external air pressure.
When the magnetic liquid 500 in the liquid container 400 ascends along the outer circumferential surface of the rotating shaft 200, the external air can enter the liquid container 400, so that the magnetic liquid 500 can be prevented from being blocked by the pressure of the external air pressure when ascending along the outer circumferential surface of the rotating shaft 200.
Further, as shown in fig. 1, after the magnetic liquid 500 ascends, the magnetic liquid 500 is divided into a first portion 510, a second portion 520 and a third portion 530, the first portion 510 is located in the sealing gap 151 to seal the first assembly 300 in the cavity 120 against dust, at least part of the second portion 520 is located in the container port, the third portion 530 is located in the liquid container 400, and the second portion 520 is connected between the first portion 510 and the third portion 530. Therefore, the magnetic liquid 500 of the magnetic liquid sealing device of the embodiment of the present invention can continuously climb upwards. Guarantee that magnetic fluid 500 can not mix outside impurity or air at the in-process of climbing, and then can improve the utility model discloses magnetic fluid sealing device's of embodiment sealing reliability.
As shown in fig. 1 and 2, the seal ring 150 is fitted around the rotating shaft 200, the seal ring 150 is located between an inner wall surface of the third through hole 141 and an outer peripheral surface of the rotating shaft 200, an outer peripheral surface of the seal ring 150 is connected to the inner wall surface of the third through hole 141, and a seal gap 151 is formed between an inner peripheral surface of the seal ring 150 and the outer peripheral surface of the rotating shaft 200. The embodiment of the utility model provides a magnetic liquid sealing device utilizes magnetic liquid 500 to replace sealing ring 150 to seal cavity 120 in casing 100. The magnetic liquid 500 can reduce friction against the rotating shaft 200 without generating abrasive particles, thereby preventing contamination of the cavity 120 and the first member 300 in the cavity 120.
Further, the sealing ring 150 is a magnetic ring, and the magnetic liquid 500 climbing into the sealing gap 151 is adapted to be attracted into the sealing gap 151 by the magnetic force of the sealing ring 150. From this magnetic fluid 500 in the seal clearance 151 is difficult to run off, simultaneously under the dual function of sealing ring 150 self magnetic field and wisenberg effect, guarantees that magnetic fluid 500 can closely fill the seal clearance, improves the utility model discloses the magnetic fluid sealing device's of embodiment sealing reliability. Specifically, the material of the sealing ring 150 is a permanent magnetic material or a magnetic rubber.
Further, the material of the rotating shaft 200 is a magnetic conductive material or a non-magnetic conductive material. Therefore, when the material of the shaft 200 is a magnetic conductive material, the seal ring 150 forms a magnetic field gradient between the inner circumferential surface of the seal ring 150 and the outer circumferential surface of the rotating shaft 200, and the magnetic liquid 500 is more easily attracted to the outer circumferential surface of the rotating shaft 200. Thereby improving the sealing reliability of the magnetic liquid sealing device of the embodiment of the utility model; when being limited by other conditions, the material of the shaft 200 is a non-magnetic material, the magnetic liquid 500 can tightly fill the sealing gap under the dual actions of the magnetic field of the sealing ring 150 and the wilenberg effect, so that the sealing reliability of the magnetic liquid sealing device provided by the embodiment of the utility model is improved, and the application range of the dustproof sealing of the magnetic liquid 500 is greatly expanded.
A specific exemplary magnetic liquid seal device according to the present invention is described below with reference to the accompanying drawings.
As shown in fig. 1 to 3, the magnetic liquid sealing apparatus according to the embodiment of the present invention includes a housing 100, a first assembly 300, a rotating shaft 200, a liquid container 400, and a sealing ring 150.
As shown in fig. 3, the housing 100 has a cavity 120 therein, and the bottom of the housing 100 is provided with a first through hole 102, and the first through hole 102 is communicated with the cavity 120.
As shown in fig. 1-3, the housing 100 includes a cylindrical member 101 and an end cap 140. The cavity 120 is formed in the cylindrical member 101, the first component 300 is located in the cavity 120, and the first component 300 is sleeved on the rotating shaft 200. The end cap 140 has a third through hole 141, an outer peripheral wall of the end cap 140 is connected to an inner wall surface of the first through hole 102, and an inner wall surface of the third through hole 141 is connected to an outer peripheral surface of the seal ring 150. The top of the housing 100 has a fourth through hole 103.
Further, as shown in fig. 1 to 3, the cylindrical member 101 has a flange 130, the flange 130 is located on the outer circumferential surface of the rotating shaft 200, and the flange 130 has connection holes 131 arranged at intervals so that the housing 100 is fixed by the flange 130.
As shown in fig. 1 and 2, the rotating shaft 200 is vertically inserted into the casing 100, and at least a portion of the rotating shaft 200 is located in the cavity 120, and the rotating shaft 200 is rotatable relative to the casing 100 along a circumferential direction of the rotating shaft 200. The upper end of the rotation shaft 200 penetrates through the fourth through hole 103, and the lower end of the rotation shaft 200 extends out of the third through hole 141.
As shown in fig. 1, a magnetic liquid 500 is contained in a liquid container 400, the liquid container 400 is located below a housing 100, a lower end of a rotating shaft 200 extends into the liquid container 400 from the top of the liquid container 400, and the lower end of the rotating shaft 200 is immersed in the magnetic liquid 500.
As shown in fig. 1 and 2, the liquid container 400 has a second through hole 401 at the top thereof, and a gap is provided between the inner wall surface of the second through hole 401 and the outer peripheral surface of the rotating shaft 200. The magnetic liquid 500 in the liquid container 400 can thereby climb up along the outer circumferential surface of the rotating shaft 200 through the gap between the inner wall surface of the second through hole 401 and the outer circumferential surface of the rotating shaft 200, so that the magnetic liquid 500 is injected into the seal gap 151.
As shown in fig. 1 and 2, a gap is provided between the top end surface of the liquid container 400 and the bottom end surface of the housing 100. The inner cavity of the liquid container 400 can thereby communicate with the outside through the gap between the inner wall surface of the second through hole 401 and the outer peripheral surface of the rotating shaft 200 and the gap between the top end surface of the liquid container 400 and the bottom end surface of the housing 100, and the air pressure inside the liquid container 400 can be made the same as the external air pressure.
As shown in fig. 1 and 2, the seal ring 150 is fitted around the rotating shaft 200, the seal ring 150 is located between an inner wall surface of the third through hole 141 and an outer peripheral surface of the rotating shaft 200, an outer peripheral surface of the seal ring 150 is connected to the inner wall surface of the third through hole 141, and a seal gap 151 is formed between an inner peripheral surface of the seal ring 150 and the outer peripheral surface of the rotating shaft 200. The sealing ring 150 is a magnetic ring, the material of the rotating shaft 200 is a magnetic conductive material, and the magnetic liquid 500 climbing into the sealing gap 151 is suitable for being absorbed into the sealing gap 151 under the magnetic force of the sealing ring 150.
In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", and the like, indicate the orientation or positional relationship indicated based on the drawings, and are only for convenience of description and simplicity of description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore, should not be construed as limiting the present invention.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.
In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," and "fixed" are to be construed broadly and may, for example, be fixedly connected, detachably connected, or integrally formed; may be mechanically coupled, may be electrically coupled or may be in communication with each other; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meaning of the above terms in the present invention can be understood according to specific situations by those skilled in the art.
In the present application, unless expressly stated or limited otherwise, the first feature may be directly on or directly under the second feature or indirectly via intermediate members. Also, a first feature "on," "over," and "above" a second feature may be directly or diagonally above the second feature, or may simply indicate that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the first feature, or may simply mean that the first feature is at a lesser elevation than the second feature.
In the present disclosure, the terms "one embodiment," "some embodiments," "an example," "a specific example," or "some examples" or the like mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present disclosure. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction.
Although embodiments of the present invention have been shown and described, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and that variations, modifications, substitutions and alterations can be made to the above embodiments by those of ordinary skill in the art without departing from the scope of the present invention.
Claims (10)
1. A magnetic fluid seal assembly, comprising:
the shell is internally provided with a cavity, the bottom of the shell is provided with a first through hole, and the first through hole is communicated with the cavity;
the rotating shaft penetrates through the shell in the vertical direction, at least part of the rotating shaft is positioned in the cavity, the rotating shaft can rotate relative to the shell along the circumferential direction of the rotating shaft, the lower end of the rotating shaft extends out of the shell through the first through hole, and the outer circumferential surface of the rotating shaft and the inner wall surface of the first through hole are spaced to form a sealing gap; and
the liquid container is positioned below the shell, the lower end of the rotating shaft extends into the liquid container from the top of the liquid container, the lower end of the rotating shaft is immersed in the magnetic liquid, and the magnetic liquid is suitable for climbing into the sealing gap along the peripheral surface of the rotating shaft.
2. The magnetic fluid sealing device according to claim 1, wherein the top of the fluid container has a second through hole having a gap between an inner wall surface thereof and an outer peripheral surface of the rotating shaft.
3. The magnetic fluid seal apparatus of claim 1, wherein a gap is provided between a top end surface of the fluid container and a bottom end surface of the housing.
4. The magnetic fluid seal of claim 1 wherein the material of said shaft is a non-magnetically conductive material.
5. The magnetic fluid sealing device according to claim 1, further comprising a sealing ring disposed on the rotating shaft, the sealing ring being located between an inner wall surface of the first through hole and an outer circumferential surface of the rotating shaft, the outer circumferential surface of the sealing ring being connected to the inner wall surface of the first through hole, the sealing gap being formed between the inner circumferential surface of the sealing ring and the outer circumferential surface of the rotating shaft.
6. The magnetic liquid sealing device according to claim 5, wherein the sealing ring is a magnetic ring, and the magnetic liquid climbing into the sealing gap is adapted to be attracted into the sealing gap by a magnetic force of the sealing ring.
7. The magnetic liquid seal device of claim 6, wherein the material of the seal ring is a permanent magnetic material or a magnetic rubber.
8. The magnetic liquid seal device according to claim 5, wherein the housing includes a cylindrical member and an end cap, the cavity is formed in the cylindrical member, the end cap has a third through hole, an outer peripheral wall of the end cap is connected to an inner wall surface of the first through hole, and an inner wall surface of the third through hole is connected to an outer peripheral surface of the seal ring.
9. The magnetic fluid seal apparatus of any one of claims 1 to 8, further comprising a first component, said first component being located within said cavity, said first component being nested on said shaft.
10. The magnetic fluid seal apparatus of claim 8, wherein the top of said cylindrical member has a flange having spaced apart attachment holes.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022481598.4U CN213839553U (en) | 2020-10-30 | 2020-10-30 | Magnetic liquid sealing device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022481598.4U CN213839553U (en) | 2020-10-30 | 2020-10-30 | Magnetic liquid sealing device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN213839553U true CN213839553U (en) | 2021-07-30 |
Family
ID=77012802
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202022481598.4U Active CN213839553U (en) | 2020-10-30 | 2020-10-30 | Magnetic liquid sealing device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN213839553U (en) |
-
2020
- 2020-10-30 CN CN202022481598.4U patent/CN213839553U/en active Active
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| KR101965601B1 (en) | Sealing device for wheel bearing | |
| CN112112971B (en) | Floating ring type magnetic liquid sealing device | |
| CN112212011A (en) | Magnetic liquid sealing device | |
| KR102653407B1 (en) | Fishing reel | |
| CN213839553U (en) | Magnetic liquid sealing device | |
| CN209252730U (en) | Round brush and clean robot | |
| CN214008073U (en) | Magnetic liquid sealing device | |
| CN108071806B (en) | Rotary shaft liquid seal device | |
| CN113154046B (en) | Magnetic liquid self-supplementing magnetic liquid sealing device | |
| CN112431926B (en) | Magnetic liquid sealing device | |
| CN112963545B (en) | Magnetic liquid sealing device and assembling method thereof | |
| CN205701076U (en) | A system centrifuge | |
| CN209100335U (en) | No leakage sealing immersible pump | |
| CN208845729U (en) | A kind of axle sealing structure of condiment oil tank | |
| CN112728105A (en) | Magnetic liquid sealing device | |
| CN209959880U (en) | Shaft end sealing device of double-horizontal-shaft forced concrete mixer | |
| CN210839157U (en) | Prevent motor water seepage sealing washer | |
| CN214146602U (en) | Magnetic liquid sealing device using mercury to prevent dust | |
| CN210715933U (en) | Shaft end sealing structure of concrete mixer | |
| CN213628881U (en) | Shaft end sealing device of horizontal mixer | |
| CN205956409U (en) | Triple -eccentric butterfly valve | |
| CN215950395U (en) | Magnetic liquid sealing device | |
| CN204268667U (en) | The smooth-going damper of a kind of multidirectional operating physical force | |
| CN215817697U (en) | Rotor assembly and electronic water pump with same | |
| CN217457033U (en) | Lifting cover and container |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant |