CN112228353A - Sewage pump seal assembly and sewage pump - Google Patents
Sewage pump seal assembly and sewage pump Download PDFInfo
- Publication number
- CN112228353A CN112228353A CN202010972054.XA CN202010972054A CN112228353A CN 112228353 A CN112228353 A CN 112228353A CN 202010972054 A CN202010972054 A CN 202010972054A CN 112228353 A CN112228353 A CN 112228353A
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- China
- Prior art keywords
- motor
- water injection
- sealing
- injection chamber
- sewage pump
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- 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.)
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D13/00—Pumping installations or systems
- F04D13/02—Units comprising pumps and their driving means
- F04D13/06—Units comprising pumps and their driving means the pump being electrically driven
- F04D13/0606—Canned motor pumps
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D29/00—Details, component parts, or accessories
- F04D29/08—Sealings
- F04D29/086—Sealings especially adapted for liquid pumps
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D29/00—Details, component parts, or accessories
- F04D29/58—Cooling; Heating; Diminishing heat transfer
- F04D29/5806—Cooling the drive system
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D29/00—Details, component parts, or accessories
- F04D29/58—Cooling; Heating; Diminishing heat transfer
- F04D29/582—Cooling; Heating; Diminishing heat transfer specially adapted for elastic fluid pumps
- F04D29/5846—Cooling; Heating; Diminishing heat transfer specially adapted for elastic fluid pumps cooling by injection
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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
- H02K5/10—Casings or enclosures characterised by the shape, form or construction thereof with arrangements for protection from ingress, e.g. water or fingers
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K9/00—Arrangements for cooling or ventilating
- H02K9/19—Arrangements for cooling or ventilating for machines with closed casing and closed-circuit cooling using a liquid cooling medium, e.g. oil
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Structures Of Non-Positive Displacement Pumps (AREA)
Abstract
The invention discloses a sewage pump sealing assembly and a sewage pump, and relates to the technical field of pumps.A sealing assembly structure comprises a motor shell provided with a cavity, wherein the motor shell comprises a protective shell with unsealed upper and lower ends and a cover plate for sealing the upper end of the protective shell, the cover plate is fixedly connected with a sealing element, the sealing element is a first air bag filled with gas, the size of the upper end surface of the first air bag is smaller than that of the lower end surface, and the upper end surface of the first air bag is in contact with the cover plate; the sealing element is heated to expand, when the expanded volume of the sealing element reaches a second threshold value, the lower end face of the sealing element contacts and extrudes the inner wall of the protective shell, the motor shell further uses the air bag as the sealing element, and an oil chamber of the existing sewage pump is changed into a water injection chamber.
Description
Technical Field
The invention relates to the technical field of sewage pumps, in particular to a sewage pump sealing assembly and a sewage pump.
Background
The sewage pump in the market at present mainly uses dry-type motor as the main, the wire winding of motor adopts the enameled wire, it adopts mechanical seal structure to seal, one of them is sealed to be used for the pump body and grease chamber to keep apart, another is sealed to be used for grease chamber and motor chamber to keep apart, the cooling is with the oil cooling mode, because the service environment of sewage pump is relatively poor, especially in the environment of being used in municipal sewage pipeline, sewage plant and underground sump, the motor operation of sewage pump can produce high temperature, the high temperature that the motor operation of present sewage pump produced mainly cools off with the lubricating oil of grease chamber, but the space of grease chamber is limited, the oil of splendid attire is less, can't satisfy the required cooling capacity of motor when high-speed operation, the motor can lead to mechanical seal to damage under the higher state of long-term temperature, cause grease chamber and motor chamber to intake.
Therefore, the invention discloses a sewage pump sealing assembly and a sewage pump, compared with the prior art, the sewage pump motor adopts a waterproof electromagnetic wire, an oil chamber of the existing sewage pump is changed into a water injection chamber, the water injection chamber is communicated with a motor chamber, the water storage amount is increased, the cooling effect is increased, the mechanical seal is changed into one, namely, the pump body impeller is separated from the water injection chamber, the mechanical seal of the oil chamber and the motor chamber of the existing sewage pump is eliminated, the water injection chamber is communicated with the interior of a motor shell, the motor is cooled by injecting water into the motor shell, the water injection amount is large, the heat dissipation effect of water is good, the cooling amount required by the motor in high-speed operation is met, the normal operation of the motor in a state with high temperature for a long time is ensured, and the air bag is also used as a sealing element for the motor shell, so that the sealing performance of the sewage pump is ensured.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provides the sewage pump, and compared with the prior art, the sewage pump has the advantages of good sealing effect and good heat dissipation effect.
The invention is realized by the following technical scheme: a sewage pump sealing assembly comprises a motor shell provided with a cavity, wherein the motor shell comprises a protective shell and a cover plate, the upper end and the lower end of the protective shell are not sealed, the cover plate seals the upper end of the protective shell, a sealing element is fixedly connected with the cover plate, the sealing element is a first air bag filled with gas, the size of the upper end surface of the first air bag is smaller than that of the lower end surface, and the upper end surface of the first air bag is in contact with the cover plate; wherein the sealing element expands when heated, and when the volume of the expansion of the sealing element reaches a second threshold value, the lower end face of the sealing element is in contact with and presses the inner wall of the protective shell.
The first air bag can be in a round table shape, the first air bag expands when heated and contracts when encountering cold due to the gas in the first air bag, the driving motor is arranged in the motor shell, the motor shell is filled with cooling liquid for heat dissipation, when the sewage pump works, the motor generates heat in the running process, the cooling liquid absorbs partial heat to reduce the temperature of the motor, and can also carry out heat conduction and radiation through the protective shell and the cover plate, the cover plate is hermetically and detachably connected with the protective shell through a rubber ring and the like, the first air bag obviously expands when being heated along with the continuous increase of the temperature in the cavity, when the volume is expanded to a certain threshold value, the lower end surface of the sealing element is in contact with and presses the inner wall of the protective shell, thereby seal the motor casing, prevent the sealed inefficacy between apron and the protective housing, sewage outside the sewage pump gets into the protective housing through the clearance between apron and the protective housing to cause the damage of sewage pump.
Preferably, for further protecting the motor, inside stator and the rotor of being provided with of motor casing cavity, the fixed cover of rotor is established on the power shaft surface, the power shaft rotates to be connected the motor casing, power shaft surface cover is equipped with two bearings, the inside two sealed gasbags that set to annular that still are provided with of cavity of motor casing are provided with inner wall and outer wall, the power shaft passes sealed gasbag's inner wall, wherein, sealed gasbag receives thermal expansion, meets cold contraction, there is the clearance sealed gasbag under the state that the power shaft does not rotate with motor casing cavity inner wall and power shaft, when sealed gasbag is the volume inflation to first threshold value, the extrusion of sealed gasbag inner wall power shaft surface bearing, the extrusion of sealed gasbag outer wall motor casing cavity inner wall, sealed gasbag passes through coupling assembling swing joint the stator, coupling assembling includes at least one slide bar of fixed mounting on sealed gasbag surface and installs at least one support arm on stator surface, the slide bar passes and sliding connection the support arm to two sealed gasbags protect rotor and stator, the external pollutant of separation, and the inflation of two sealed gasbags makes the cavity is filled completely to the coolant liquid, and external sewage can't get into the cavity.
Preferably, a water inlet is formed in the top of the motor shell.
The invention also discloses a sewage pump sealed by using the sealing component, the sewage pump also comprises a water injection chamber shell, a water injection chamber end cover is arranged on the water injection chamber shell to form a water injection chamber in the water injection chamber shell, one end of the motor shell is provided with an opening, the water injection chamber shell and the water injection chamber end cover are arranged at the opening end of the motor shell, the water injection chamber shell and the water injection chamber end cover are sleeved on a power shaft of the motor, the power shaft of the motor is rotationally connected with the water injection chamber shell through a bearing, a skeleton oil seal is arranged between the power shaft of the motor and the water injection chamber end cover, the skeleton oil seal is sleeved on the power shaft of the motor, a water discharge screw hole is arranged on the water injection chamber shell, the water discharge screw hole is blocked by a water discharge bolt, the water injection chamber is communicated with the interior of the motor shell through a communicating pipe arranged on the water injection chamber shell, the pump body is arranged on the water injection chamber, and the impeller is connected with the power shaft key of the motor, the impeller is driven to rotate by the power shaft, the lower end cover is arranged at the water inlet of the pump body, the base is arranged on the lower end cover, and the water in the water injection chamber dissipates heat to the power shaft.
Preferably, the waterproof electromagnetic wire is wound on the surface of the rotor, the waterproof electromagnetic wire is insulated by three layers, an inner layer wire core is an oxygen-free copper 130-grade polyester enameled wire, a middle layer is a high-pressure polyethylene insulating layer, and an outer layer is a polyamide sheath layer, so that the waterproof performance of the motor is effectively improved, the motor can work in water for a long time, and heat is dissipated through water; the oxygen-free copper 130-grade polyester enameled wire has very good insulating property, electrical property and heat resistance, scratch and abrasion resistance and mechanical strength resistance; the high-pressure polyethylene insulating layer has high toughness, acid and alkali resistance and excellent insulativity; the polyamide sheath layer can be soaked for a long time, and plays a very good protection role on the high-pressure polyethylene insulating layer.
The invention discloses a papermaking dewatering device, compared with the prior art:
the sewage pump motor adopts the waterproof electromagnetic wire, changes the oil chamber of the prior sewage pump into the water injection chamber, leads the water injection chamber to be communicated with the motor chamber, increases the water storage amount and increases the cooling effect, and changes the mechanical seal into one, namely the separation of the pump body impeller and the water injection chamber, thereby reducing the mechanical seal of the oil chamber and the motor chamber of the prior sewage pump, leading the water injection chamber to be communicated with the interior of the motor shell, utilizing water injection in the motor shell to cool the motor, having large water injection amount and good water heat dissipation effect, meeting the cooling amount required by the motor during high-speed operation, ensuring the normal operation of the motor under the state of high long-term temperature, and leading the motor shell to further use the air bag as a sealing element, and ensuring the sealing property of the sewage pump motor.
Drawings
FIG. 1 is a schematic view showing the construction of a sewage pump according to the present invention;
FIG. 2 is a schematic external view of the sealed airbag of the present invention;
fig. 3 is a front view of a stator in the present invention.
Detailed Description
The following examples are given for the detailed implementation and specific operation of the present invention, but the scope of the present invention is not limited to the following examples.
A sewage pump sealing assembly, as shown in fig. 1 to 3, comprises a motor casing 1 provided with a cavity, wherein the motor casing 1 comprises a protective casing with unsealed upper and lower ends and a cover plate for sealing the upper end of the protective casing, the cover plate is fixedly connected with a sealing element 15, the sealing element is a first air bag filled with gas, the size of the upper end surface of the first air bag is smaller than that of the lower end surface, and the upper end surface of the first air bag contacts the cover plate; wherein the sealing member 15 expands when heated, and when the volume of the expansion of the sealing member 15 reaches a second threshold value, the lower end surface of the sealing member 15 is in contact with and presses against the inner wall of the protective shell.
Based on the structure, the first air bag can be in a round table shape, the first air bag is heated to expand due to gas inside and contracts when encountering cold, the driving motor is arranged inside the motor shell 1, the motor shell 1 is filled with cooling liquid for cooling, when the sewage pump works, the motor generates heat in the running process, the cooling liquid absorbs partial heat to reduce the temperature of the motor, and heat conduction and heat dissipation can be carried out through the protective shell and the cover plate, the cover plate is detachably connected with the protective shell in a sealing way through a rubber ring and the like, the first air bag is obviously heated and expands, when the volume expands to a certain threshold value, the lower end face of the sealing piece 15 is in contact with and extrudes the inner wall of the protective shell, so that the motor shell 1 is sealed, the sealing failure between the cover plate and the protective shell is prevented, and sewage outside the sewage pump enters the protective shell through a gap between the cover plate and, thereby causing damage to the sewage pump.
For further protection to the motor, inside stator 13 and the rotor 14 of being provided with of motor casing 1 cavity, the fixed cover of rotor 14 is established on power shaft 12 surface, power shaft 12 rotates and connects motor casing 1, power shaft 12 surface cover is equipped with two bearings, still be provided with two inside sealed gasbags 11 that set up into annular of the cavity of motor casing 1, be provided with inner wall and outer wall, power shaft 12 passes the inner wall of sealed gasbag 11, wherein, sealed gasbag 11 is heated the thermal expansion, meets the cold contraction, there is the clearance between sealed gasbag 11 and motor casing 1 cavity inner wall and power shaft 12 under the state that power shaft 12 does not rotate, when sealed gasbag 11 is when the volume inflation reaches first threshold value, the extrusion of sealed gasbag 11 inner wall power shaft 12 surface bearing, the extrusion of sealed gasbag 11 outer wall motor casing 1 cavity inner wall, sealed gasbag 11 passes through coupling assembling swing joint stator 13, coupling assembling includes at least one slide bar 111 of fixed mounting on sealed gasbag 11 surface and installs at least one support arm 141 on stator 13 surface, slide bar 111 passes and sliding connection support arm 141 to two sealed gasbags 11 protect rotor and stator, the external pollutant of separation, and the inflation of two sealed gasbags 11 makes the coolant liquid fill the cavity completely, and external sewage can't get into the cavity, the water inlet has been seted up at motor casing 1 top for in pouring the coolant liquid into motor casing 1.
The invention also discloses a sewage pump sealed by using the sealing component, the sewage pump also comprises a water injection chamber shell, a water injection chamber end cover is arranged on the water injection chamber shell to form a water injection chamber in the water injection chamber shell, one end of the motor shell 1 is provided with an opening, the water injection chamber shell and the water injection chamber end cover are arranged at the opening end of the motor shell 1, the water injection chamber shell and the water injection chamber end cover are sleeved on a power shaft 12 of the motor, the power shaft 12 of the motor is rotationally connected with the water injection chamber shell through a bearing, a framework oil seal is arranged between the power shaft 12 of the motor and the water injection chamber end cover, the framework oil seal is sleeved on the power shaft 12 of the motor, a water discharge screw hole is arranged on the water injection chamber shell, the water injection screw hole is blocked by a water discharge bolt, the position a in figure 1 is a water injection chamber, the water injection chamber is communicated with the interior of the motor shell 1 through a communicating pipe arranged on the water injection chamber shell, the impeller sets up inside the pump body, and the impeller is connected with the power shaft 12 key-type of motor, and is rotatory through power shaft 12 drive impeller, and the bottom end cap is installed in the water inlet position of the pump body, and the pedestal mounting is on the bottom end cap, and the indoor water of water injection dispels the heat to power shaft 12.
Furthermore, the waterproof electromagnetic wire is wound on the surface of the rotor and is insulated by three layers, an inner layer wire core is an oxygen-free copper 130-grade polyester enameled wire, a middle layer is a high-voltage polyethylene insulating layer, and an outer layer is a polyamide sheath layer, so that the waterproof performance of the motor is effectively improved, the motor can work in water for a long time, and heat is dissipated through the water; the oxygen-free copper 130-grade polyester enameled wire has very good insulating property, electrical property and heat resistance, scratch and abrasion resistance and mechanical strength resistance; the high-pressure polyethylene insulating layer has high toughness, acid and alkali resistance and excellent insulativity; the polyamide sheath layer can be soaked for a long time, and plays a very good protection role on the high-pressure polyethylene insulating layer.
In summary, compared with the prior art, the sewage pump motor of the invention adopts the waterproof electromagnetic wire, the oil chamber of the existing sewage pump is changed into the water injection chamber, the water injection chamber is communicated with the motor chamber, the water storage amount is increased, the cooling effect is increased, the mechanical seal is changed into one, namely, the pump body impeller is separated from the water injection chamber, the mechanical seal of the oil chamber and the motor chamber of the existing sewage pump is eliminated, the water injection chamber is communicated with the interior of the motor shell, the motor is cooled by injecting water into the motor shell, the water injection amount is large, the heat dissipation effect of water is good, the cooling amount required by the motor in high-speed operation is met, the normal operation of the motor in a state with high temperature for a long time is ensured, and the air bag is also used as a sealing element of the motor shell, so that the sealing performance of.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be able to cover the technical scope of the present invention and the equivalent alternatives or modifications according to the technical solution and the inventive concept of the present invention within the technical scope of the present invention.
It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
Claims (8)
1. A sewage pump sealing assembly is used for sealing a sewage pump and is characterized by comprising a motor casing (1) provided with a cavity, wherein the motor casing (1) comprises a protective casing and a cover plate, the upper end and the lower end of the protective casing are not sealed, the cover plate seals the upper end of the protective casing, a sealing element (15) is fixedly connected with the cover plate, the sealing element is a first air bag filled with gas, the size of the upper end face of the first air bag is smaller than that of the lower end face, and the upper end face of the first air bag is in contact with the cover plate;
wherein the sealing element (15) expands when heated, and when the volume of the expansion of the sealing element (15) reaches a second threshold value, the lower end surface of the sealing element (15) is in contact with and presses against the inner wall of the protective shell.
2. The sewage pump sealing assembly according to claim 1, wherein a stator (13) and a rotor (14) are disposed inside the cavity of the motor housing (1), the rotor (14) is fixedly sleeved on the surface of the power shaft (12), the power shaft (12) is rotatably connected with the motor housing (1), two bearings are sleeved on the surface of the power shaft (12), two sealing airbags (11) disposed in a ring shape are further disposed inside the cavity of the motor housing (1) and provided with an inner wall and an outer wall, the power shaft (12) penetrates through the inner wall of the sealing airbag (11), wherein the sealing airbag (11) expands when heated and contracts when cooled, a gap exists between the sealing airbag (11) and the inner wall of the cavity of the motor housing (1) and the power shaft (12) when the power shaft (12) does not rotate, and when the volume of the sealing airbag (11) expands to a first threshold value, the inner wall of the sealing air bag (11) extrudes the surface bearing of the power shaft (12), and the outer wall of the sealing air bag (11) extrudes the inner wall of the cavity of the motor casing (1).
3. A sewage pump sealing assembly according to claim 2, characterised in that the sealing bladder (11) is movably connected to the stator (13) by means of a connecting assembly comprising at least one sliding rod (111) fixedly mounted on the surface of the sealing bladder (11) and at least one supporting arm (141) mounted on the surface of the stator (13), the sliding rod (111) passing through and being slidably connected to the supporting arm (141).
4. The sewage pump seal assembly of claim 3, wherein the motor housing (1) is provided with a water inlet at the top.
5. A sewage pump comprising a seal assembly according to any one of claims 2 to 4.
6. The sewage pump according to claim 5, further comprising a water injection chamber housing, wherein the water injection chamber end cover is mounted on the water injection chamber housing to form a water injection chamber inside the water injection chamber housing, one end of the motor housing (1) is provided with an opening, the water injection chamber housing and the water injection chamber end cover are mounted at the opening end of the motor housing (1), the water injection chamber housing and the water injection chamber end cover are sleeved on a power shaft (12) of the motor, the power shaft (12) of the motor is rotatably connected with the water injection chamber housing through a bearing, a skeleton oil seal is arranged between the power shaft (12) of the motor and the water injection chamber end cover, the skeleton oil seal is sleeved on the power shaft (12) of the motor, the water injection chamber housing is provided with a water discharge screw hole, the water discharge screw hole is blocked through a water discharge bolt, the water injection chamber is communicated with the inside of the motor housing (1) through a communication pipe arranged on the water injection chamber housing, and the pump body is mounted on the, the impeller sets up inside the pump body, and power shaft (12) key-type connection of impeller and motor, and it is rotatory through power shaft (12) drive impeller, and the lower end cover is installed in the water inlet position of the pump body, and the pedestal mounting is on the lower end cover.
7. The sewage pump of claim 6, wherein the waterproof magnet wire is wound around the surface of the rotor.
8. The sewage pump of claim 7, wherein the waterproof electromagnetic wire is insulated by three layers, the core of the inner layer is oxygen-free copper (130) grade polyester enameled wire, the middle layer is high-pressure polyethylene insulation layer, and the outer layer is polyamide (1010) sheath layer.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010972054.XA CN112228353A (en) | 2020-09-16 | 2020-09-16 | Sewage pump seal assembly and sewage pump |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010972054.XA CN112228353A (en) | 2020-09-16 | 2020-09-16 | Sewage pump seal assembly and sewage pump |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN112228353A true CN112228353A (en) | 2021-01-15 |
Family
ID=74107569
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010972054.XA Pending CN112228353A (en) | 2020-09-16 | 2020-09-16 | Sewage pump seal assembly and sewage pump |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN112228353A (en) |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN202937495U (en) * | 2012-10-29 | 2013-05-15 | 玉锋实业集团有限公司 | Centrifugal fan combined sealing device |
| CN103335109A (en) * | 2013-06-26 | 2013-10-02 | 东台友铭船舶配件有限公司 | Pneumatic sealing device capable of allowing stern shaft to rotate |
| CN108894993A (en) * | 2018-05-31 | 2018-11-27 | 山东泉盈泵业有限公司 | A kind of sewage pump using water-cooled |
| CN110311500A (en) * | 2019-07-26 | 2019-10-08 | 陈景伟 | A kind of water proof type New energy automobile motor based on stable output |
| CN111396369A (en) * | 2020-04-26 | 2020-07-10 | 黑龙江大学 | Safe type immersible pump with prevent to freeze and rise |
-
2020
- 2020-09-16 CN CN202010972054.XA patent/CN112228353A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN202937495U (en) * | 2012-10-29 | 2013-05-15 | 玉锋实业集团有限公司 | Centrifugal fan combined sealing device |
| CN103335109A (en) * | 2013-06-26 | 2013-10-02 | 东台友铭船舶配件有限公司 | Pneumatic sealing device capable of allowing stern shaft to rotate |
| CN108894993A (en) * | 2018-05-31 | 2018-11-27 | 山东泉盈泵业有限公司 | A kind of sewage pump using water-cooled |
| CN110311500A (en) * | 2019-07-26 | 2019-10-08 | 陈景伟 | A kind of water proof type New energy automobile motor based on stable output |
| CN111396369A (en) * | 2020-04-26 | 2020-07-10 | 黑龙江大学 | Safe type immersible pump with prevent to freeze and rise |
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Application publication date: 20210115 |