CN113036988A - Novel external bearing motor - Google Patents
Novel external bearing motor Download PDFInfo
- Publication number
- CN113036988A CN113036988A CN202110298320.XA CN202110298320A CN113036988A CN 113036988 A CN113036988 A CN 113036988A CN 202110298320 A CN202110298320 A CN 202110298320A CN 113036988 A CN113036988 A CN 113036988A
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- bearing
- motor
- hole
- mounting flange
- receiving groove
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K5/00—Casings; Enclosures; Supports
- H02K5/04—Casings or enclosures characterised by the shape, form or construction thereof
- H02K5/16—Means for supporting bearings, e.g. insulating supports or means for fitting bearings in the bearing-shields
- H02K5/161—Means for supporting bearings, e.g. insulating supports or means for fitting bearings in the bearing-shields radially supporting the rotary shaft at both ends of the rotor
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
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Abstract
The invention discloses a novel external bearing motor, which comprises: the motor iron shell is provided with a second bearing hub, a second through hole is formed in the second bearing hub, a second mounting flange is arranged on the inner side wall of the second through hole, and a second oil receiving groove is formed in the upper surface of the second mounting flange; the motor comprises a front cover, a first mounting flange is arranged on the inner side wall of a bearing mounting hole of the front cover, a first oil receiving groove is formed in the upper surface of the first mounting flange, and the front cover is fixedly mounted on a motor iron shell; the first bearing is fixedly arranged in the bearing mounting hole; the second bearing is fixedly arranged in the second through hole; the motor can prevent foreign matters (lubricating oil and grease) from entering the motor from the shaft hole to pollute parts in the motor and cause the failure of the motor; and the assembly is simple, the manufacturing cost is low, and the reliability is high.
Description
Technical Field
The invention relates to the technical field of motor equipment, in particular to a novel external bearing motor.
Background
The existing motor generally presses the bearing into the bearing hub from the inner side of the front cover or the iron shell, and the bearing hub are in interference fit. In the actual use process, once the lubricating oil in the bearing is volatilized under the high-temperature condition or is leaked out due to the pumping action in the work, the lubricating oil can directly pollute parts in the motor, such as a commutator, so that the mixture of carbon powder and oil is accumulated in one or more grooves among 3 copper sheets of the commutator, the short circuit among the commutator sheets is caused, and finally the motor fails early.
In addition, due to the design of the bearing arranged on the inner side of the front cover or the iron shell of the existing motor, the inside of the front cover or the iron shell is easily polluted in the assembling process, and the axial displacement of the motor rotor and the extension length of the rotor shaft can be directly influenced by the transfer position of the bearing, so that the position design of other parts is influenced.
Therefore, there is an urgent need for a novel outboard bearing motor that can solve one or more of the above problems.
Disclosure of Invention
In order to solve one or more problems in the prior art, the invention provides a novel external bearing motor. The technical scheme adopted by the invention for solving the problems is as follows: a novel outboard bearing motor, comprising: the motor iron shell is provided with a second bearing hub, a second through hole is formed in the second bearing hub and connected with the inside of the motor iron shell, a second mounting flange is arranged on the inner side wall of the second through hole, and a second oil receiving groove is formed in the upper surface of the second mounting flange;
the motor comprises a front cover, a first mounting flange is arranged on the inner side wall of a bearing mounting hole of the front cover, a first oil receiving groove is formed in the upper surface of the first mounting flange, and the front cover is fixedly mounted on a motor iron shell;
the first bearing is fixedly arranged in the bearing mounting hole, the first mounting flange props against the first bearing and limits the first bearing, the first oil receiving groove is matched with the first bearing, and the first oil receiving groove absorbs and releases lubricating oil on the first bearing;
the second bearing is fixedly arranged in the second through hole, the second mounting flange supports against the second bearing and limits the second bearing, the second oil receiving groove is matched with the second bearing, and the second oil receiving groove absorbs and releases lubricating oil in the second bearing.
Further, still include: the bearing hub is fixedly arranged on the bearing mounting hole of the front cover and is provided with a through hole;
the first mounting flange is arranged on the inner side wall of the through hole, and the first oil receiving groove is arranged on the upper surface of the first mounting flange;
the first bearing is fixedly arranged in the through hole, the first mounting flange props against the first bearing and limits the first bearing, and the first oil receiving groove is matched with the first bearing;
and the second bearing hub is in interference fit with the bearing hub mounting hole or is riveted or welded.
Further, a bearing hub mounting hole is formed in the motor iron shell, and the second bearing hub is fixedly mounted in the bearing hub mounting hole.
Further, the second bearing hub is integrated with the motor iron shell.
Further, the first mounting flange forms an inner bore having a diameter equal to or greater than the diameter of the inner bore of the first bearing;
the second mounting flange defines an inner bore having a diameter equal to or greater than the diameter of the inner bore of the second bearing.
Further, the diameter of the first oil receiving groove is larger than that of an inner hole formed by the first mounting flange, and the diameter of the first oil receiving groove is smaller than that of the bearing mounting hole;
the diameter of the second oil receiving groove is larger than that of an inner hole formed by the second mounting flange, and the diameter of the second oil receiving groove is smaller than that of the second through hole.
Furthermore, the first mounting flange is annular, and the first oil receiving groove is circular; the second mounting flange is annular, and the second oil receiving groove is circular.
Further, the second bearing hub is in interference fit with the bearing hub mounting hole or is riveted or welded.
Further, the magnet is fixedly installed in the motor iron shell by using magnet glue.
The invention has the following beneficial values: the motor iron shell, the front cover, the first bearing, the second bearing and other components are skillfully connected together by matching with a self-designed structure, so that once lubricating oil in the bearing volatilizes under a high-temperature condition or directly pollutes components or parts in the motor after being exuded under the action of a pump during working; such as a commutator, causes a mixture of carbon powder and oil to accumulate in one or more grooves between three copper sheets of the commutator, thereby causing short circuit between the segments of the commutator and finally failure of the motor. The front cover and the motor iron shell are designed in a split type and an integrated mode, and can be adapted to more use occasions; in production, the assembly and production process is simple, the manufacturing cost is low, the reliability is high, the size of the rotor cannot be influenced due to the fact that the size of the assembly position of the bearing is independent, and the manufacturing precision can be improved. The practical value of the invention is greatly improved.
Drawings
FIG. 1 is a perspective view of a novel outboard bearing motor of the present invention;
FIG. 2 is a cross-sectional view of a novel outboard bearing motor of the present invention;
fig. 3 is a cross-sectional view 1 of a motor iron shell of a novel external bearing motor according to the present invention;
fig. 4 is a partial view at the position I of a cross-sectional view 1 of a motor iron shell of the novel external bearing motor of the invention;
fig. 5 is a cross-sectional view 2 of a motor iron shell of the novel external bearing motor of the invention;
fig. 6 is a partial view at II of a cross-sectional view of a motor iron shell of the novel outboard bearing motor of the present invention;
FIG. 7 is a schematic view of a front cover of a novel outboard bearing motor according to the present invention;
FIG. 8 is a top view of a front cover of a novel outboard bearing motor in accordance with the present invention;
FIG. 9 is a cross-sectional view taken along line A-A of the front cover of the novel outboard bearing motor of the present invention, shown generally at 1;
fig. 10 is a partial view at III of a cross-sectional view of a front cover of a novel outboard bearing motor of the present invention;
FIG. 11 is a cross-sectional view taken along line A-A of the front cover of the novel outboard bearing motor of the present invention;
fig. 12 is a partial view at V of a cross-sectional view 2 of a front cover of a novel outboard bearing motor of the present invention;
FIG. 13 is a schematic view of the prior art motor mounted on the latch;
fig. 14 is a schematic view of the installation of the novel external bearing motor on the locking device.
[ reference numerals ]
101 … front cover
102 … bearing mounting hole
103 … first mounting flange
104 … first oil receiving groove
105 … inner hole
110 … second bearing hub
111 … through hole
201 … first bearing
210 … second bearing
220 … bearing
301 … front cover of traditional motor
401 … iron shell of traditional motor
402 … magnet
403 … rotor
501 … Worm
601 … rubber wall of first fastener
602 … second fastener rubber wall
701 … iron shell of motor
702 … second bearing hub
703 … second through hole
704 … second mounting flange
705 … second oil collecting tank
710 … bearing hub mounting holes.
Detailed Description
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in detail below. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein.
As shown in fig. 1 to 12, the present invention discloses a novel outboard bearing motor, which includes: the motor iron shell 701 is provided with a second bearing hub 702, the second bearing hub 702 is provided with a second through hole 703, the second through hole 703 is connected with the inside of the motor iron shell 701, the inner side wall of the second through hole 703 is provided with a second mounting flange 704, and the upper surface of the second mounting flange 704 is provided with a second oil receiving groove 705;
a first mounting flange 103 is arranged on the inner side wall of a bearing mounting hole 102 of the front cover 101, a first oil receiving groove 104 is arranged on the upper surface of the first mounting flange 103, and the front cover 101 is fixedly mounted on the motor iron shell 701;
a first bearing 201, wherein the first bearing 201 is fixedly installed in the bearing installation hole 102, the first installation flange 103 abuts against the first bearing 201 and limits the first bearing 201, the first oil receiving groove 104 is matched with the first bearing 201, and the first oil receiving groove 104 absorbs and releases lubricating oil on the first bearing 201;
a second bearing 210, said second bearing 210 being fixedly mounted in said second through hole 703, said second mounting flange 704 abutting said second bearing 210 and retaining said second bearing 210, said second oil receiving groove 705 cooperating with said second bearing 210, said second oil receiving groove 705 receiving and releasing the lubricating oil in said second bearing 210.
It should be noted that, as shown in fig. 13, the bearing 220 is installed inside a conventional motor iron shell 401, when the rotor rotates at a high speed, the high rotation speed makes the air pressure near the surface of the shaft body smaller than the air pressure in the oil-retaining bearing, so as to generate a pumping action, and the lubricating oil in the bearing is sucked out and used as the bearing inner diameter surface and the shaft lubricant, but the lubricating oil is easily thrown out downwards due to the high-speed rotation of the rotor shaft, and the lubricating oil thrown out downwards enters components inside the motor, so as to pollute the inside of the motor. As can be seen from comparing fig. 4 and fig. 13, the second oil receiving groove 705 blocks and stores the thrown-out lubricating oil, when the motor stops operating, the negative pressure between the oil-containing bearing and the rotor disappears, the air pressure outside the oil-containing bearing is greater than the air pressure inside the bearing, after a short storage, the lubricating oil on the second oil receiving groove 705 and on the surface of the oil-containing bearing is sucked back into the second bearing 210 by the action of capillary phenomenon, and thus, the lubricating oil in the second bearing 210 can be recycled or pollutants generated by long-term operation cannot enter the interior of the motor. The function of the first bearing 201 in the front cover 101 is consistent with the function and principle of the second bearing 210 in the motor iron shell 701, and will not be described in detail herein.
It should be noted that, the front cover 101 and the motor iron shell 701 are externally mounted with bearings and cooperate with the oil suction groove to work, so that the pollution to the inside of the motor can be reduced to the maximum extent, and the effect is better compared with that of a single externally mounted bearing.
It should be noted that, as shown in fig. 1, no slot for fixing a magnet is provided on an outer side surface of the motor iron shell 701 in the present technical solution, and the magnet is generally fixedly mounted on the motor iron shell 701 by using a magnet adhesive; the conventional motor iron shell is generally provided with a clamping groove for mounting a magnet and a slingshot for internal fixation on the outer surface, and the number of the clamping grooves is reduced, so that the production processes can be reduced, the assembly efficiency and the assembly position precision are improved, and the iron shell cannot be displaced, and the overall cost is reduced.
Specifically, as shown in fig. 4 and 10, the first mounting flange 103 forms an inner bore 105 having a diameter equal to or greater than the diameter of the inner bore of the first bearing 201; the diameter of the first oil receiving groove 104 is larger than that of an inner hole 105 formed by the first mounting flange 103, and the diameter of the first oil receiving groove 104 is smaller than that of the bearing mounting hole 102; the first mounting flange 103 is circular, and the first oil receiving groove 104 is circular; the second mounting flange 704 defines an inner bore having a diameter equal to or greater than the diameter of the inner bore of the second bearing 210; the diameter of the second oil receiving groove 705 is larger than that of the inner hole formed by the second mounting flange 704, and the diameter of the second oil receiving groove 705 is smaller than that of the second through hole 703; the second mounting flange 704 is circular, and the second oil receiving groove 705 is circular.
It should be noted that, in general, the outer diameter of the second bearing hub 702 is tapered, or the outer diameter of the second bearing hub 702 is cylindrical.
Specifically, as shown in fig. 9 to 12, the front cover 101 is mounted in a manner of bearing: integrated design, split type design. Wherein split type design includes: a bearing hub 110, wherein the bearing hub 110 is fixedly installed on the bearing installation hole 102 of the front cover 101, and the bearing hub 110 is provided with a through hole 111;
the first mounting flange 103 is disposed on an inner sidewall of the through hole 111, and the first oil receiving groove 104 is disposed on an upper surface of the first mounting flange 103;
the first bearing 201 is fixedly installed in the through hole 111, the first installation flange 103 abuts against the first bearing 201 and limits the first bearing 201, and the first oil receiving groove 104 is matched with the first bearing 201. The bearing hub 110 is interference fit or riveted with the bearing mounting hole 102.
It should be noted that the principle of the front cover split design is consistent with the principle of the front cover 101 integrated design, and only the arrangement positions of the first mounting flange 103 and the first oil receiving groove 104 are changed from the bearing mounting hole 102 on the front cover 101 to the bearing hub 110 to form a split design, so as to adapt to more scenes. The same effect is obtained.
Specifically, as shown in fig. 3-6, the second bearing hub 702 has two arrangements, the first being: the second bearing hub 702 is integrated with the motor iron shell 701; the second method is as follows: the motor iron shell 701 is provided with a bearing hub mounting hole 710, the second bearing hub 702 is fixedly mounted in the bearing hub mounting hole 710, and generally, the second bearing hub 702 is in interference fit with the bearing hub mounting hole 710. The second arrangement mode forms a split type design so as to be suitable for more use scenes, and the principle, the structure and the effect of the split type design are the same as those of integration. Generally, the second bearing hub 702 is interference fit or riveted or welded to the bearing hub mounting hole 710.
When the split bearing is used, the bearing can be conveniently and quickly assembled due to the external arrangement, the first bearing 201 and the second bearing 210 are generally fixedly installed through interference fit, and the split bearing hub is also generally fixedly installed through interference fit or other fixing modes, so that the split bearing is high in reliability and low in cost. And when the rotor rotates at a high speed, foreign matters (lubricating oil and grease) can be prevented from entering the motor from the shaft hole to pollute parts in the motor and cause the failure of the motor.
As shown in fig. 13, when a conventional motor with a built-in bearing is installed in a latch, the latch needs to be provided with a first latch rubber wall 601 and a second latch rubber wall 602; when the worm locking device is used, if the axial force applied by the paired gears faces to the left, the first locking device rubber wall 601 supports the worm to bear the axial force, if the axial force applied by the paired gears faces to the right, the worm 501 is firstly contacted with the shaft end, then the force is transmitted to the second locking device rubber wall 602 through the shaft end, and finally the axial force is respectively borne by the space between the worm 501 and the shaft end and the second locking device rubber wall 602. The design structure of the existing built-in bearing motor and the matched locking device is complex, the accumulated tolerance is large, and the reliability is not high; and when the end of the rotor shaft contacts the rubber wall of the locking device due to the axial force generated by the operation of the gear, friction is formed between the end of the shaft and the rubber wall. In order to reduce the friction force between the rotor and the lock and improve the working efficiency of the lock, the end of a rotating shaft on the rotor is designed into a ball head, the design causes a small contact area between the end of the shaft and the rubber wall of the lock, and in order to avoid or slow down the damage of the rubber wall of the lock by the end of the rotor shaft, the requirement on the strength of the material of the lock shell is high, which means high cost. An oil retaining ring or a meson is generally arranged in the motor using the traditional motor iron shell, but when the rotor 403 rotates at a high speed, oil of the bearing is easy to volatilize or creep through the oil retaining ring or the meson and enter the motor, so that the interior of the motor is polluted; and the motor iron shell in this technique can effectively block the volatilization and the crawling of bearing oil through the cooperation of second mounting flange 704 with second oil receiving groove 705, avoids the inside by the pollution of motor.
As shown in fig. 14, when the present invention is applied to a latch, if the axial force applied by the mating gear is toward the left, the first latch rubber wall 601 supports the end of the worm shaft to bear the axial force, and if the axial force applied by the mating gear is toward the right, the worm shaft 501 is not in contact with the end of the shaft, and the axial force is directly borne between the worm shaft 501 and the bearing end, so that the second latch rubber wall 602 at the rightmost side can be eliminated.
In summary, the motor iron shell 701, the front cover 101, the first bearing 201, the second bearing 210 and other components are skillfully connected together by matching with a self-designed structure, so that once lubricating oil in the bearing volatilizes under a high-temperature condition or directly pollutes components or parts inside the motor after being exuded due to a pumping action in work; such as a commutator, causes a mixture of carbon powder and oil to accumulate in one or more grooves between three copper sheets of the commutator, thereby causing short circuit between the segments of the commutator and finally failure of the motor. The front cover and the motor iron shell are designed in a split type and an integrated mode, and can be adapted to more use occasions; in production, the assembly and production process is simple, the manufacturing cost is low, the reliability is high, the size of the rotor cannot be influenced due to the fact that the size of the assembly position of the bearing is independent, and the manufacturing precision can be improved. The practical value of the invention is greatly improved.
The embodiments described above are merely illustrative of one or more embodiments of the present invention, which are described in more detail and detail, but are not to be construed as limiting the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the spirit of the invention, which falls within the scope of the invention. Therefore, the protection scope of the present invention should be subject to the appended claims.
Claims (10)
1. The novel external bearing motor is characterized in that a motor iron shell is provided with a second bearing hub, a second through hole is formed in the second bearing hub and connected with the inside of the motor iron shell, a second mounting flange is arranged on the inner side wall of the second through hole, and a second oil receiving groove is formed in the upper surface of the second mounting flange;
the motor comprises a front cover, a first mounting flange is arranged on the inner side wall of a bearing mounting hole of the front cover, a first oil receiving groove is formed in the upper surface of the first mounting flange, and the front cover is fixedly mounted on a motor iron shell;
the first bearing is fixedly arranged in the bearing mounting hole, the first mounting flange props against the first bearing and limits the first bearing, the first oil receiving groove is matched with the first bearing, and the first oil receiving groove absorbs and releases lubricating oil on the first bearing;
the second bearing is fixedly arranged in the second through hole, the second mounting flange supports against the second bearing and limits the second bearing, the second oil receiving groove is matched with the second bearing, and the second oil receiving groove absorbs and releases lubricating oil in the second bearing.
2. The novel external bearing motor as claimed in claim 1, wherein a bearing hub is fixedly mounted on the bearing mounting hole of the front cover, and the bearing hub is provided with a through hole;
the first mounting flange is arranged on the inner side wall of the through hole, and the first oil receiving groove is arranged on the upper surface of the first mounting flange;
the first bearing is fixedly installed in the through hole, the first installation flange props against the first bearing and limits the first bearing, and the first oil receiving groove is matched with the first bearing.
3. The novel external bearing motor as claimed in claim 1, wherein a bearing hub mounting hole is formed in the motor iron shell, and the second bearing hub is fixedly mounted in the bearing hub mounting hole.
4. The new outboard bearing motor of claim 1, wherein said second bearing hub is integral with said motor iron shell.
5. The new outboard bearing motor of claim 1, wherein said first mounting flange defines an inner bore having a diameter equal to or greater than an inner bore diameter of said first bearing;
the second mounting flange defines an inner bore having a diameter equal to or greater than the diameter of the inner bore of the second bearing.
6. The novel outboard bearing motor of claim 1, wherein said first oil sump has a diameter greater than a diameter of an inner bore formed by said first mounting flange, said first oil sump having a diameter less than a diameter of said bearing mounting bore;
the diameter of the second oil receiving groove is larger than that of an inner hole formed by the second mounting flange, and the diameter of the second oil receiving groove is smaller than that of the second through hole.
7. The novel outboard bearing motor of claim 1, wherein said first mounting flange is circular and said first oil sump is circular;
the second mounting flange is annular, and the second oil receiving groove is circular.
8. The novel outboard bearing motor of claim 1, wherein said second bearing hub is interference fit or riveted or welded to said bearing hub mounting hole.
9. The novel outboard bearing motor of claim 2, wherein said bearing hub is interference fit or riveted with said bearing mounting hole.
10. The novel outboard bearing motor of claim 1, wherein a magnet is fixedly mounted within said motor iron housing using magnet glue.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110298320.XA CN113036988A (en) | 2021-03-19 | 2021-03-19 | Novel external bearing motor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110298320.XA CN113036988A (en) | 2021-03-19 | 2021-03-19 | Novel external bearing motor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN113036988A true CN113036988A (en) | 2021-06-25 |
Family
ID=76472015
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110298320.XA Pending CN113036988A (en) | 2021-03-19 | 2021-03-19 | Novel external bearing motor |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN113036988A (en) |
Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2005045968A (en) * | 2003-07-24 | 2005-02-17 | Mitsubishi Electric Corp | Geared motor |
| CN201146424Y (en) * | 2007-07-31 | 2008-11-05 | 高鸿朴 | Dead shaft type external rotor electric machine |
| JP2011004589A (en) * | 2009-06-16 | 2011-01-06 | Vorwerk & Co Interholding Gmbh | Electric motor and assembling method of the same |
| CN206682312U (en) * | 2017-04-12 | 2017-11-28 | 厦门精研自动化元件有限公司 | A kind of oil seal lubrication system |
| CN207039346U (en) * | 2017-08-17 | 2018-02-23 | 安阳市福沃德机械有限责任公司 | A kind of explosion-proof electro spindle |
| CN207069737U (en) * | 2017-07-21 | 2018-03-02 | 中山大洋电机股份有限公司 | A kind of plastic packaging external rotor electric machine |
| CN109309428A (en) * | 2017-07-28 | 2019-02-05 | Weg电子设备有限公司 | Rotary generator |
| CN111277070A (en) * | 2018-12-04 | 2020-06-12 | 佛山市威灵洗涤电机制造有限公司 | Motor and electric pump |
-
2021
- 2021-03-19 CN CN202110298320.XA patent/CN113036988A/en active Pending
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2005045968A (en) * | 2003-07-24 | 2005-02-17 | Mitsubishi Electric Corp | Geared motor |
| CN201146424Y (en) * | 2007-07-31 | 2008-11-05 | 高鸿朴 | Dead shaft type external rotor electric machine |
| JP2011004589A (en) * | 2009-06-16 | 2011-01-06 | Vorwerk & Co Interholding Gmbh | Electric motor and assembling method of the same |
| CN206682312U (en) * | 2017-04-12 | 2017-11-28 | 厦门精研自动化元件有限公司 | A kind of oil seal lubrication system |
| CN207069737U (en) * | 2017-07-21 | 2018-03-02 | 中山大洋电机股份有限公司 | A kind of plastic packaging external rotor electric machine |
| CN109309428A (en) * | 2017-07-28 | 2019-02-05 | Weg电子设备有限公司 | Rotary generator |
| CN207039346U (en) * | 2017-08-17 | 2018-02-23 | 安阳市福沃德机械有限责任公司 | A kind of explosion-proof electro spindle |
| CN111277070A (en) * | 2018-12-04 | 2020-06-12 | 佛山市威灵洗涤电机制造有限公司 | Motor and electric pump |
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Application publication date: 20210625 |