CN104578534A - Submersible motor exhausting and water supplementing system applied to deep well - Google Patents
Submersible motor exhausting and water supplementing system applied to deep well Download PDFInfo
- Publication number
- CN104578534A CN104578534A CN201510030845.XA CN201510030845A CN104578534A CN 104578534 A CN104578534 A CN 104578534A CN 201510030845 A CN201510030845 A CN 201510030845A CN 104578534 A CN104578534 A CN 104578534A
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- valve
- spool
- submersible motor
- seat
- core assembly
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K15/00—Check valves
- F16K15/02—Check valves with guided rigid valve members
- F16K15/025—Check valves with guided rigid valve members the valve being loaded by a spring
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K17/00—Safety valves; Equalising valves, e.g. pressure relief valves
- F16K17/02—Safety valves; Equalising valves, e.g. pressure relief valves opening on surplus pressure on one side; closing on insufficient pressure on one side
- F16K17/04—Safety valves; Equalising valves, e.g. pressure relief valves opening on surplus pressure on one side; closing on insufficient pressure on one side spring-loaded
- F16K17/044—Safety valves; Equalising valves, e.g. pressure relief valves opening on surplus pressure on one side; closing on insufficient pressure on one side spring-loaded with more than one spring
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K47/00—Means in valves for absorbing fluid energy
- F16K47/04—Means in valves for absorbing fluid energy for decreasing pressure or noise level, the throttle being incorporated in the closure member
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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
- H02K5/12—Casings or enclosures characterised by the shape, form or construction thereof specially adapted for operating in liquid or gas
- H02K5/132—Submersible electric motors
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Power Engineering (AREA)
- Structures Of Non-Positive Displacement Pumps (AREA)
Abstract
The invention provides a submersible motor exhausting and water supplementing system applied to a deep well and belongs to the technical field of submersible motors. By the adoption of the submersible motor exhausting and water supplementing system to the deep well, an inner cavity of a motor can be automatically exhausted and fed with water, the system is simple in structure, and the service life of the motor can be effectively prolonged. According to the technical scheme of the submersible motor exhausting and water supplementing system applied to the deep well, a water inlet valve and a vent valve are arranged on a shell of a submersible motor body and communicated with the interior of a submerged pump body, the water inlet valve is used for supplementing water to an inner cavity of the submersible motor body, and the vent valve is used for exhausting air in the submersible motor body; a filter is arranged on the water inlet valve, located at the outer end of the water inlet valve and used for removing impurities in water entering the inner cavity of the submersible motor body. The submersible motor exhausting and water supplementing system can be widely applied to the field of submersible motors.
Description
Technical field
A kind of submersible motor exhaust water charging system being applied to deep well of the present invention, belongs to submersible electric motor technical field.
Background technique
Submersible motor voltage-regulating system major part in the market adopts rubber pressure regulator membrane to add pressure adjusting spring voltage-regulating system, its shortcoming is: 1. voltage-regulating system has an air hole that must arrange and extraneous UNICOM, the easy like this foreign material such as silt that cause block pressure regulation space, even foreign material puncture pressure regulator membrane, cause submersible motor to leak or silt enters and causes motor damage.2. there is certain air unavoidably in motor cavity, when particularly motor cavity temperature is higher, partial air is separated out from motor cooling water, swims in the upper end portion of motor, and high-temperature gas is easy to cause motor winding upper end portion premature aging, finally cause electrical machine insulation to reduce, electrical machinery life shortens.3. the pressure that in existing deep well, inlet valve bears is comparatively large, and the flow velocity entered in motor cavity is wayward, easily by inlet valve and motor damage.
Summary of the invention
Instant invention overcomes the deficiency that prior art exists, provide a kind ofly automatically to be exhausted motor cavity, the submersible motor exhaust water charging system that can be applied to deep well of moisturizing, this system architecture simply, is skillfully constructed and effectively can extends the working life of motor.
In order to solve the problems of the technologies described above, the technical solution used in the present invention is: a kind of submersible motor exhaust water charging system being applied to deep well, comprise submersible motor body, inlet valve and outlet valve, described inlet valve and outlet valve are all arranged on the shell of submersible motor body, described inlet valve and outlet valve are all communicated with the inside of submersible motor body, described inlet valve is used for submersible pump body interior supplementing water, and described outlet valve is for discharging the gas of submersible pump body interior;
Described submersible pump body is provided with filter, and described filter bits is in the outer end of inlet valve, and described filter is for removing the impurity entered in submersible pump body interior water.
The structure of inlet valve comprises valve body and mangetic core assembly, described mangetic core assembly is actively plugged in valve body, one end of described mangetic core assembly withstands in valve body, and the other end of described mangetic core assembly is provided with end bell and spigot joint, and one end of described end bell and spigot joint to be inserted in valve body and to be compressed by mangetic core assembly;
The structure of described mangetic core assembly is: comprise push rod, first spring, cover for seat, first valve seat, second valve seat, first spool, second spool, second spring, core retainer plate and valve pocket, the mutual plug-in formation in one end of described cover for seat and one end of valve pocket housing, described push rod is actively plugged on the other end of cover for seat, described first spring housing is contained on push rod for making push rod reset, the relevant position of described cover for seat and valve pocket is provided with the first delivery hole, described first valve seat is arranged in valve pocket, described first valve seat is pressed on valve pocket by cover for seat, described first spool is movably arranged in valve pocket, described first spool and valve pocket Spielpassung, described first spool and the first valve seat cone match, described second valve seat and core retainer plate are fixedly installed in the first spool, described second spool and the second spring are positioned at core retainer plate, described second spool runs through the first spool, described second spool and the second valve seat cone match, described second spring is between the second spool and valve pocket, described second spring is used for making the second valve core reset, formation liquid storage cylinder between described second spool and push rod,
Described end bell and spigot joint is provided with the first damping hole be connected with mangetic core assembly inside, described valve body is provided with liquid entering hole and liquid outlet, described liquid entering hole is communicated with the liquid storage cylinder of mangetic core assembly by the first delivery hole, and described liquid outlet is communicated with the first valve core inside of mangetic core assembly by being arranged on the second delivery hole on valve pocket.
The end of described valve pocket is provided with the second damping hole, and the first spool is connected with the attachment hole be arranged on valve body by described second damping hole, and described attachment hole is used for being connected with safety valve.
Described valve body and end bell and spigot joint are provided with control mouth, and described control mouth is all connected with the first damping hole.
The cooperation place of described mangetic core assembly and end bell and spigot joint and valve body is provided with multiple-sealed circle.
Described inlet valve and outlet valve are all arranged on the top of submersible motor body.
The beneficial effect that the present invention compared with prior art has is: the present invention utilizes one-way valve principle, pushes one-way valve open discharge outside submersible motor at submersible motor chamber pressure higher than the gas of motor cavity during exhaust check valve setting pressure or liquid; When motor cavity pressure is less than moisturizing one-way valve setting pressure, extraneous water enters motor for submerged pump inner chamber by filter, motor cavity pressure stability is kept by this system, filter is connected in water-feeding valve outlet its import inwardly, can effectively stop the foreign material such as silt and enter submersible motor inside, the present invention is simple and practical, effectively can extend the working life of motor.In the present invention, inlet valve adopts integral plugged formula structure, is made up of valve body and mangetic core assembly, and the weight of mangetic core assembly is only 1/5 of whole Pilot operated check valve gross weight, only need change mangetic core assembly during maintenance, easy to maintenance.And the sealing of inlet valve is reliable, valve body and mangetic core assembly adopt organizes sealing more, adopts cone match to seal, during Pilot operated check valve forward feed flow between spool and valve seat, liquid enters from liquid entering hole, overcome the elastic force of the second spring by hydraulic coupling, the first spool is pushed away the first valve seat, set up forward liquid flow path, when liquid entering hole stops feed flow, the elastic force of the second spring can make the first valve core reset, intercepts between liquid storage cylinder and the second delivery hole, realizes forward flow and the sealing function of this valve.The unloading opening process of inlet valve is secondary unloading in addition, and hydraulic shock power is little, and for reducing the hydraulic shock produced when Pilot operated check valve unloading is opened, this valve adopts secondary unloading structure.This valve has two the first spools and the second spool that are nested together.First order unloading is that the second spool is opened, first spool is not opened, it is reducing pressure by regulating flow process, effect is got off by the high pressure drop of motor cavity, impact to reduce hydraulic pressure, second level unloading is that the first spool opens the process forming current major paths completely, effect be the water large discharge that pressure has been lowered through Pilot operated check valve, motor cavity pressure is declined rapidly.Secondary unloading effect is that the energy of motor cavity high-pressure water flow is divided into twice release by original once release, compression shock is reduced to minimum, although the fluid-control one-way valve arrangement of this twin-stage unloading is complicated, because the active area of the second spool is little, required push rod thrust is also little; Though the active area of the first spool is comparatively large, opened unloading by the second spool, pressure reduces, and push rod required thrust is corresponding minimizing also, therefore can adapt to high pressure deep well.
Accompanying drawing explanation
Below in conjunction with accompanying drawing, the present invention is described further.
Fig. 1 is structural representation of the present invention.
Fig. 2 is the structural representation of inlet valve in the present invention.
Fig. 3 is the side view of inlet valve in the present invention.
In figure, 1 being submersible motor body, 2 being inlet valve, 21 be valve body, 22 be mangetic core assembly, 23 be end bell and spigot joint, 24 be core retainer plate for push rod, 25 is the first spring, 26 for cover for seat, 27 be the first valve seat, 28 be the second valve seat, 29 be the first spool, 210 be the second spool, 211 is the second spring, 212,213 be liquid entering hole for valve pocket, 214 be the first delivery hole, 215 is the first damping hole, 216,217 be attachment hole for liquid outlet, 218 be the second delivery hole, 219 is the second damping hole, 220,221 being outlet valve for controlling mouth, 3,4 be filter.
Embodiment
As shown in FIG. 1 to 3, a kind of submersible motor exhaust water charging system being applied to deep well of the present invention, comprise submersible motor body 1, inlet valve 2 and outlet valve 3, described inlet valve 2 and outlet valve 3 are all arranged on the shell of submersible motor body 1, described inlet valve 2 is all communicated with the inside of submersible motor body 1 with outlet valve 3, described inlet valve 2 is for giving the inner supplementing water of submersible motor body 1, and described outlet valve 3 is for discharging the gas of submersible motor body 1 inner chamber;
Described inlet valve 2 is provided with filter 4, and described filter 4 is positioned at the outer end of inlet valve 2, and described filter 4 is for removing the impurity entered in submersible motor body 1 internal water.
The structure of described inlet valve 2 is: comprise valve body 21 and mangetic core assembly 22, described mangetic core assembly 22 is actively plugged in valve body 21, one end of described mangetic core assembly 22 withstands in valve body 21, the other end of described mangetic core assembly 22 is provided with end bell and spigot joint 23, and one end of described end bell and spigot joint 23 to be inserted in valve body 21 and to be compressed by mangetic core assembly 22;
The structure of described mangetic core assembly 22 is: comprise push rod 24, first spring 25, cover for seat 26, first valve seat 27, second valve seat 28, first spool 29, second spool 210, second spring 211, core retainer plate 212 and valve pocket 213, the mutual plug-in formation in one end of described cover for seat 26 and one end of valve pocket 213 housing, described push rod 24 is actively plugged on the other end of cover for seat 26, described first spring 25 is sleeved on push rod 24 for making push rod 24 reset, the relevant position of described cover for seat 26 and valve pocket 213 is provided with the first delivery hole 214, described first valve seat 27 is arranged in valve pocket 213, described first valve seat 27 is pressed on valve pocket 213 by cover for seat 26, described first spool 29 is movably arranged in valve pocket 213, described first spool 29 and valve pocket 213 Spielpassung, described first spool 29 and the first valve seat 27 cone match, described second valve seat 28 and core retainer plate 212 are fixedly installed in the first spool 29, described second spool 210 and the second spring 211 are positioned at core retainer plate 212, described second spool 210 runs through the first spool 29, described second spool 210 and the second valve seat 28 cone match, described second spring 211 is between the second spool 210 and valve pocket 213, described second spring 211 resets for making the second spool 210, formation liquid storage cylinder between described second spool 210 and push rod 24,
Described end bell and spigot joint 23 is provided with the first damping hole 215 be connected with mangetic core assembly 22 inside, described valve body 21 is provided with liquid entering hole 216 and liquid outlet 217, described liquid entering hole 216 is communicated with the liquid storage cylinder of mangetic core assembly 22 by the first delivery hole 214, and described liquid outlet 217 is communicated with the first spool 29 inside of mangetic core assembly 22 by being arranged on the second delivery hole 218 on valve pocket 213.
The end of described valve pocket 213 is provided with the second damping hole 219, and the first spool 29 is connected with the attachment hole 220 be arranged on valve body 21 by described second damping hole 219, and described attachment hole 220 is for being connected with safety valve.
Described valve body 21 and end bell and spigot joint 23 are provided with control mouth 221, and described control mouth 221 is all connected with the first damping hole 215.
Described mangetic core assembly 22 and end bell and spigot joint 23 are provided with multiple-sealed circle with the cooperation place of valve body 21.
Described inlet valve 2 and outlet valve 3 are all arranged on the top of submersible motor body 1.
The present invention utilizes one-way valve principle, in the top of motor for submerged pump, double check valve structure is set, wherein outlet valve outlet outwardly, water-feeding valve exports import inwardly and connects filter, pushes one-way valve open discharge outside submersible pump at submersible motor chamber pressure higher than the gas of motor cavity during exhaust check valve setting pressure or liquid; When motor cavity pressure is less than moisturizing one-way valve setting pressure, extraneous water enters motor for submerged pump inner chamber by filter, motor cavity pressure stability is kept by this system, export import inwardly at water-feeding valve and connect filter, can effectively stop the foreign material such as silt and enter submersible motor inner chamber, the present invention is simple and practical, effectively can extend the working life of motor.
The present invention describes the principle and operation instruction etc. of inlet valve for Pilot operated check valve.Pilot operated check valve has good one-way sealing, be usually used in the occasion that executive component needs long-time pressurize, locking, concerning deep well motor, Pilot operated check valve is the chief component ensureing motor cavity steady pressure, be used for locking motor cavity water inlet and make it to keep certain pressure; When motor cavity is intake, give the control chamber feed flow of this valve simultaneously, valve is opened, ensure that inside and outside motor, cavity pressure is balanced, protection motor.The quality of Pilot operated check valve quality, directly affects the reliability of deep-well motor.If the sealability of one-way valve is bad, can't lock the intake tunnel of motor cavity, motor just exists by the risk of damaging by pressure.
The present invention adopts integral plugged formula structure, is made up of valve body 21 and mangetic core assembly 22, and the weight of mangetic core assembly 22 is only 1/5 of whole Pilot operated check valve gross weight, only need change mangetic core assembly 22 during maintenance, easy to maintenance.
Sealing of the present invention is reliable, valve body 21 and mangetic core assembly 22 adopt organizes sealing more, cone match is adopted to seal between spool and valve seat, during Pilot operated check valve forward feed flow, liquid enters from liquid entering hole 216, the elastic force of the second spring 211 is overcome by hydraulic coupling, first spool 29 is pushed away the first valve seat 27, set up forward liquid flow path, when liquid entering hole 216 stops feed flow, the elastic force of the second spring 211 can make the first spool 29 reset, and intercepts, realize forward flow and the sealing function of this valve by between liquid storage cylinder and the second delivery hole 218.
Unloading opening process of the present invention is secondary unloading, and hydraulic shock power is little, and for reducing the hydraulic shock produced when Pilot operated check valve unloading is opened, this valve adopts secondary unloading structure.This valve has two the first spool 29 and the second spools 210 be nested together.First order unloading is that the second spool 210 is opened, first spool 29 is not opened, it is reducing pressure by regulating flow process, effect is got off by the high pressure drop of motor cavity, impact to reduce hydraulic pressure, second level unloading is the process that the first spool 29 opens formation current major path completely, effect be the water large discharge that pressure has been lowered through Pilot operated check valve, motor cavity hydraulic pressure is declined rapidly.Secondary unloading effect is that the energy of the high pressure water of motor cavity is divided into twice release by original once release, compression shock is reduced to minimum, although the fluid-control one-way valve arrangement of this twin-stage unloading is complicated, because the active area of the second spool 210 is little, required push rod 24 thrust is also little; Though the active area of the first spool 210 is comparatively large, opened unloading by the second spool 210, pressure reduces, and the also corresponding minimizing of push rod 24 required thrust, therefore can adapt to high pressure deep water system.
The present invention has following characteristics: internal resistance is little, suitable large discharge work; Valve port majority adopts conical surface seal, and thus leak little, the working medium for ground viscosity such as emulsified liquids is also suitable for, and structure is simple, reliable operation, standardization level are high; Size and weight can be reduced significantly for large discharge, high pressure, more complicated hydraulic system.Require that Pilot operated check valve must seal reliably, long service life.
By reference to the accompanying drawings embodiments of the invention are explained in detail above, but the present invention is not limited to above-described embodiment, in the ken that those of ordinary skill in the art possess, various change can also be made under the prerequisite not departing from present inventive concept.
Claims (5)
1. one kind is applied to the submersible motor exhaust water charging system of deep well, it is characterized in that, comprise submersible motor body (1), inlet valve (2) and outlet valve (3), described inlet valve (2) and outlet valve (3) are all arranged on the shell of submersible motor body (1), described inlet valve (2) is all communicated with the inside of submersible motor body (1) with outlet valve (3), described inlet valve (2) is for giving submersible motor body (1) inner supplementing water, and described outlet valve (3) is for discharging the inner gas of submersible motor body (1);
Described inlet valve (2) is provided with filter (4), described filter (4) is positioned at the outer end of inlet valve (2), and described filter (4) is for removing the impurity entered in submersible motor body (1) internal water;
The structure of described inlet valve (2) is: comprise valve body (21) and mangetic core assembly (22), described mangetic core assembly (22) is actively plugged in valve body (21), one end of described mangetic core assembly (22) withstands in valve body (21), the other end of described mangetic core assembly (22) is provided with end bell and spigot joint (23), and one end of described end bell and spigot joint (23) to be inserted in valve body (21) and to be compressed by mangetic core assembly (22);
The structure of described mangetic core assembly (22) is: comprise push rod (24), first spring (25), cover for seat (26), first valve seat (27), second valve seat (28), first spool (29), second spool (210), second spring (211), core retainer plate (212) and valve pocket (213), the mutual plug-in formation in one end of described cover for seat (26) and one end of valve pocket (213) housing, described push rod (24) is actively plugged on the other end of cover for seat (26), described first spring (25) is sleeved on push rod (24) for making push rod (24) reset, the relevant position of described cover for seat (26) and valve pocket (213) is provided with the first delivery hole (214), described first valve seat (27) is arranged in valve pocket (213), described first valve seat (27) is pressed on valve pocket (213) by cover for seat (26), described first spool (29) is movably arranged in valve pocket (213), described first spool (29) and valve pocket (213) Spielpassung, described first spool (29) and the first valve seat (27) cone match, described second valve seat (28) and core retainer plate (212) are fixedly installed in the first spool (29), described second spool (210) and the second spring (211) are positioned at core retainer plate (212), described second spool (210) runs through the first spool (29), described second spool (210) and the second valve seat (28) cone match, described second spring (211) is positioned between the second spool (210) and valve pocket (213), described second spring (211) resets for making the second spool (210), formation liquid storage cylinder between described second spool (210) and push rod (24),
Described end bell and spigot joint (23) is provided with the first damping hole (215) be connected with mangetic core assembly (22) inside, described valve body (21) is provided with liquid entering hole (216) and liquid outlet (217), described liquid entering hole (216) is communicated by the liquid storage cylinder of the first delivery hole (214) with mangetic core assembly (22), and described liquid outlet (217) is communicated with the first spool (29) inside of mangetic core assembly (22) by being arranged on the second delivery hole (218) on valve pocket (213).
2. a kind of submersible motor exhaust water charging system being applied to deep well according to claim 1, it is characterized in that, the end of described valve pocket (213) is provided with the second damping hole (219), first spool (29) is connected with the attachment hole (220) be arranged on valve body (21) by described second damping hole (219), and described attachment hole (220) is for being connected with safety valve.
3. a kind of submersible motor exhaust water charging system being applied to deep well according to claim 1 and 2, it is characterized in that, described valve body (21) and end bell and spigot joint (23) are provided with control mouth (221), and described control mouth (221) is all connected with the first damping hole (215).
4. a kind of submersible motor exhaust water charging system being applied to deep well according to claim 3, it is characterized in that, described mangetic core assembly (22) and end bell and spigot joint (23) are provided with multiple-sealed circle with the cooperation place of valve body (21).
5. a kind of submersible motor exhaust water charging system being applied to deep well according to claim 4, it is characterized in that, described inlet valve (2) and outlet valve (3) are all arranged on the top of motor for submerged pump (1).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510030845.XA CN104578534A (en) | 2015-01-22 | 2015-01-22 | Submersible motor exhausting and water supplementing system applied to deep well |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510030845.XA CN104578534A (en) | 2015-01-22 | 2015-01-22 | Submersible motor exhausting and water supplementing system applied to deep well |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN104578534A true CN104578534A (en) | 2015-04-29 |
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ID=53093953
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201510030845.XA Pending CN104578534A (en) | 2015-01-22 | 2015-01-22 | Submersible motor exhausting and water supplementing system applied to deep well |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN104578534A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109538498A (en) * | 2018-12-26 | 2019-03-29 | 合肥盛亚电机电泵有限公司 | A kind of underwater automatic water-replenishing device of water-filling submersible electric pump |
| CN110266137A (en) * | 2019-05-23 | 2019-09-20 | 中海油能源发展股份有限公司 | A kind of positive pressure water-tight device and waterproof method for submersible electric motor |
| CN112820084A (en) * | 2020-12-31 | 2021-05-18 | 南通威尔电机有限公司 | Safety control method and device for efficient submersible motor |
| CN112916476A (en) * | 2019-12-06 | 2021-06-08 | 苏州宝时得电动工具有限公司 | Cleaning machine |
-
2015
- 2015-01-22 CN CN201510030845.XA patent/CN104578534A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109538498A (en) * | 2018-12-26 | 2019-03-29 | 合肥盛亚电机电泵有限公司 | A kind of underwater automatic water-replenishing device of water-filling submersible electric pump |
| CN110266137A (en) * | 2019-05-23 | 2019-09-20 | 中海油能源发展股份有限公司 | A kind of positive pressure water-tight device and waterproof method for submersible electric motor |
| CN112916476A (en) * | 2019-12-06 | 2021-06-08 | 苏州宝时得电动工具有限公司 | Cleaning machine |
| CN112820084A (en) * | 2020-12-31 | 2021-05-18 | 南通威尔电机有限公司 | Safety control method and device for efficient submersible motor |
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Application publication date: 20150429 |