CN202068173U - Water inlet detection and protection device of submersible sewage pump motor - Google Patents
Water inlet detection and protection device of submersible sewage pump motor Download PDFInfo
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- CN202068173U CN202068173U CN2011200325255U CN201120032525U CN202068173U CN 202068173 U CN202068173 U CN 202068173U CN 2011200325255 U CN2011200325255 U CN 2011200325255U CN 201120032525 U CN201120032525 U CN 201120032525U CN 202068173 U CN202068173 U CN 202068173U
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- pump motor
- resistance
- water inlet
- sewage pump
- circuit
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 43
- 239000010865 sewage Substances 0.000 title claims abstract description 39
- 238000001514 detection method Methods 0.000 title claims abstract description 24
- 239000004020 conductor Substances 0.000 claims abstract description 32
- 230000000087 stabilizing effect Effects 0.000 claims abstract description 23
- 239000003990 capacitor Substances 0.000 claims description 27
- 238000007599 discharging Methods 0.000 claims description 13
- 239000004576 sand Substances 0.000 claims description 13
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 claims description 11
- 229910052710 silicon Inorganic materials 0.000 claims description 11
- 239000010703 silicon Substances 0.000 claims description 11
- 238000004804 winding Methods 0.000 claims description 9
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 6
- 229910052802 copper Inorganic materials 0.000 claims description 5
- 239000010949 copper Substances 0.000 claims description 5
- TVEXGJYMHHTVKP-UHFFFAOYSA-N 6-oxabicyclo[3.2.1]oct-3-en-7-one Chemical compound C1C2C(=O)OC1C=CC2 TVEXGJYMHHTVKP-UHFFFAOYSA-N 0.000 claims description 3
- 230000001681 protective effect Effects 0.000 claims description 3
- 230000003321 amplification Effects 0.000 abstract description 7
- 238000003199 nucleic acid amplification method Methods 0.000 abstract description 7
- 239000004568 cement Substances 0.000 abstract description 2
- 239000003245 coal Substances 0.000 abstract description 2
- 238000012423 maintenance Methods 0.000 abstract description 2
- 238000005065 mining Methods 0.000 abstract description 2
- 238000003889 chemical engineering Methods 0.000 abstract 1
- 239000010841 municipal wastewater Substances 0.000 abstract 1
- 239000003208 petroleum Substances 0.000 abstract 1
- 238000009628 steelmaking Methods 0.000 abstract 1
- 238000004065 wastewater treatment Methods 0.000 abstract 1
- 239000003921 oil Substances 0.000 description 6
- 235000019198 oils Nutrition 0.000 description 6
- 230000015572 biosynthetic process Effects 0.000 description 4
- 239000000523 sample Substances 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 238000001914 filtration Methods 0.000 description 3
- 238000009413 insulation Methods 0.000 description 3
- 239000000853 adhesive Substances 0.000 description 2
- 230000001070 adhesive effect Effects 0.000 description 2
- 230000005611 electricity Effects 0.000 description 2
- 238000009434 installation Methods 0.000 description 2
- 239000010721 machine oil Substances 0.000 description 2
- 235000019476 oil-water mixture Nutrition 0.000 description 2
- 238000007789 sealing Methods 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000004519 grease Substances 0.000 description 1
- WABPQHHGFIMREM-UHFFFAOYSA-N lead(0) Chemical compound [Pb] WABPQHHGFIMREM-UHFFFAOYSA-N 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 239000000758 substrate Substances 0.000 description 1
- 238000004078 waterproofing Methods 0.000 description 1
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- Control Of Non-Positive-Displacement Pumps (AREA)
- Structures Of Non-Positive Displacement Pumps (AREA)
Abstract
The utility model relates to electrical equipment, in particular to a water inlet detection and protection control device of a submersible sewage pump motor. In the water inlet detection and protection device of the submersible sewage pump motor, the output end of a power supply circuit is connected with a voltage stabilizing circuit, the output end of the voltage stabilizing circuit is connected with an amplification circuit, and the output end of the amplification circuit is connected with one end of a water leakage detection conductor R*. The water inlet detection and protection device of the submersible sewage pump motor can be used for completing water inlet detection and protection of the submersible sewage pump motor, has the advantages of simple structure, reliable performance, convenience in use and maintenance, low cost, easiness in processing without adding of any auxiliary equipment and the like and is suitable for the chemical engineering industry, the petroleum industry, the pharmacy industry, the mining industry, the papermaking industry, a cement plant, a steel making plant, a power plant, the coal processing industry, and waterproof protection of the submersible pump motor of a drainage system for a municipal wastewater treatment plant.
Description
Technical field
The utility model relates to electric equipment, specifically draws a kind of submersible sewage pump motor water inlet and detects and the protection control device.
Background technology
Immersible pump is worked for a long time under water, and is very high to the water-tight performance requirement of equipment, in time do not find in time to handle if motor for submerged pump leaks, and can cause the motor for submerged pump coil short to burn, and can cause than large economy and lose.Present employed water-proof protection device is: the motor for submerged pump structure is divided into three parts substantially, epicoele is a wire connection cavity, the bottom is cast with a circular water storage tank, a switch is installed, when epicoele is intake, at first be pooled in the water storage tank, the ball float of switch come-up causes the contact conducting, triggers the actuating of relay in the immersible pump comprehensive protection device; The centre is stator and rotor; Cavity of resorption is the machine oil chamber, and inside is installed one and revealed probe, detects by following mechanical seal and enters leaking of grease chamber.Because this protective device switch is easy to failure; cavity of resorption machine oil chamber has only one to reveal probe; the test point skewness; the undesirable secondary that also can easily cause is installed to be revealed; this device is except that power cable; immersible pump also need be equipped with a special-purpose multicore guard signal cable, the installation cost height, is difficult for maintenance and repair, and it is shorter to influence result of use, useful life.
Summary of the invention
The technical problems to be solved in the utility model is at the deficiencies in the prior art; provide a kind of sewage motor for submerged pump that can prevent to leak, and the submersible sewage pump motor water inlet that causes motor windings to be burnt detect and the protection control device because of the poorly sealed motor that causes.
A kind of submersible sewage pump motor water inlet of the utility model detects and the protection control device is achieved by following technical proposals: a kind of submersible sewage pump motor water inlet detects and the protection control device comprises power circuit; voltage stabilizing circuit; amplifying circuit; the detection conductor leaks; the proof submersible sand discharging pump motor main circuit; the proof submersible sand discharging pump motor control loop; the submersible sewage pump motor stops indicator light; submersible sewage pump motor run indicator; described submersible sewage pump motor water inlet detects and protects the output of the power circuit of control device to be connected with the input of voltage stabilizing circuit; the output of voltage stabilizing circuit is connected with the input of amplifying circuit; the output A end of amplifying circuit is connected with detection conductor one end that leaks, and the detection conductor other end that leaks is arranged in the proof submersible sand discharging pump motor case.
A kind of submersible sewage pump motor water inlet of the utility model detects and the protection control device has following beneficial effect compared with prior art: the detection conductor R* employing naked copper lead that leaks of the present utility model is made and is wound on the immersible pump stator winding and is arranged in the immersible pump end cap; after water seal, sealing gasket inefficacy or other reason of immersible pump are leaked; water enters motor for submerged pump inside; after leaking; oil water mixture splashes to leak and detects between conductor R* and the casing, and the resistance that detects conductor R* of leaking increases along with the ratio of water in the motor and diminishes.Detect conductor R* to drop to the casing insulation resistance when leaking＜during 1M Ω, of the present utility model leaking detected conductor R* and casing formation humistor loop.Get this signal of telecommunication with the balance bridge circuit, to the operational amplifier amplification, remove to trigger controllable silicon after filtering, direct current relay KA coil must conduct.The normally-closed contact KA of relay disconnects the motor for submerged pump control circuit, cut off the power supply of motor for submerged pump contactor KM coil, thereby A.C. contactor KM disconnects the immersible pump autostop, and 9V direct current relay normally opened contact KA connects sound light alarming circuit simultaneously.
The utility model can finish that submersible sewage pump motor water inlet detects and protection, and cost is low, and handling ease is simple in structure, and dependable performance is used easy to maintenancely, need not increase characteristics such as any auxiliary equipment.A kind of submersible sewage pump motor water inlet of the utility model detects and the protection control device is applicable to chemical industry, oil, pharmacy, mining, paper industry, cement plant, steel mill, power plant, coal processing industry, and the waterproofing protection of the motor for submerged pump of municipal sewage plant's drainage system.
Description of drawings
A kind of submersible sewage pump motor water inlet of the utility model detects and the protection control device has following accompanying drawing:
Fig. 1 is that a kind of submersible sewage pump motor water inlet of the utility model detects and protection control device electrical schematic diagram;
Fig. 2 is that a kind of submersible sewage pump motor water inlet of the utility model detects and protection control device motor for submerged pump control electrical schematic diagram.
Embodiment
A kind of submersible sewage pump motor water inlet detects and protects the control device technical scheme to be further described to the utility model below in conjunction with drawings and Examples.
As Fig. 1-shown in Figure 2; a kind of submersible sewage pump motor water inlet of the utility model detects and the protection control device comprises power circuit 1; voltage stabilizing circuit 2; amplifying circuit 3; leak and detect conductor 4; proof submersible sand discharging pump motor main circuit 5; proof submersible sand discharging pump motor control loop 6; the submersible sewage pump motor stops indicator light 7; submersible sewage pump motor run indicator 8; described submersible sewage pump motor water inlet detects and protects the output of the power circuit 1 of control device to be connected with the input of voltage stabilizing circuit 2; the output of voltage stabilizing circuit 2 is connected with the input of amplifying circuit 3; the output A end of amplifying circuit 3 is connected with detection conductor 4 one ends that leak, and detection conductor 4 other ends that leak are arranged in the proof submersible sand discharging pump motor case.
Described submersible sewage pump motor water inlet detects and the former limit of power circuit 1 isolating transformer B1 of protection control device is connected with ac power output, and secondary is exported direct current 9V behind rectifier rectification; Described voltage stabilizing circuit 2 is connected with the cathode output end of rectifier and is connected with electrode input end 3 pin of Voltage stabilizing module 7806 with an end of capacitor C 1, C2, diode D1,9V direct current relay KA coil one end, resistance R 2; Output 1 pin of Voltage stabilizing module 7806 is connected with the A end of capacitor C 5, C6, resistance R 7 one ends and the detection conductor R* that leaks; Described power circuit 1 isolating transformer B1 secondary cathode output end and capacitor C 1 ~ C8 behind rectifier rectification, negative input 2 pin of the other end of resistance R 1, R3, R4, R8, R9 and Voltage stabilizing module 7806 connect; The anodal pin of described amplifying circuit 2 computing module LM324 is connected with the positive pole of diode D3 negative pole, diode D4 positive pole, capacitor C 8, an end of resistance R 5, an end common ground of the other end of resistance R 5 and resistance R 8; The negative pole pin of computing module LM324 is connected with the positive pole of diode D3 positive pole, diode D4 negative pole, capacitor C 7, an end of resistance R 6, and the other end of resistance R 6 is connected with the common port of resistance R 7, resistance R 8; The output pin 1 of computing module LM324 is connected with the positive pole of capacitor C 4, an end of resistance R 3 with resistance R 4 series connection backs with diode D2 is anodal, inserts the gate pole of controllable silicon T1 at last; The anode of controllable silicon T1 is connected with the coil other end, the positive pole of diode D1, capacitor C 3 one ends of direct current relay KA, and capacitor C 3 other ends link to each other with resistance R 1, the LED negative pole joins, and the positive pole of LED is connected with the other end of resistance R 2.
A circle is twined in the lower surface that the described detection conductor R* that leaks adopts the naked copper lead to make and be wound on the immersible pump stator winding, in stator slot, pass, twine a circle again along the stator winding upper surface, leak and detect on the conductor R* wire sleeve that the one end is connected with amplifying circuit 3 output terminals A ends behind the insulating sleeve, the other end is unsettled to be arranged in the proof submersible sand discharging pump motor case.
Embodiment 1.
A kind of sewage of the utility model promotes control device the utility model one submersible sewage pump motor water inlet detection automatically and protection control comprises fuse RD, isolating transformer B1,9V DC power supply, capacitor C 1
~C8, diode D1
~D4, resistance R 1
~R9, direct current relay KA, controllable silicon T1, LED, Voltage stabilizing module 7806, computing amplification module LM324, the detection conductor R* that leaks constitute the water inlet of submersible sewage pump motor and detect and protect control device core circuit (detection) part; The motor main circuit that circuit breaker Q F, A.C. contactor KM, thermal relay FR, submersible sewage motor M constitute; Stop button SB, relay K A normally-closed contact, thermal relay normally closed contact, start button SA, self-locking electric shock KM, A.C. contactor KM coil, auxiliary relay 1K coil, 1K normally-closed contact, water pump stop indicator light, 1K normally opened contact, water pump operation indicator light formation proof submersible sand discharging pump control loop.
Described major loop three-phase alternating-current supply U, V, W connect by circuit breaker Q F, A.C. contactor KM, and A.C. contactor KM output is connected with thermal relay FR input, and thermal relay FR output is connected with the motor M input; Described submersible sewage pump motor water inlet detects and protection control device core circuit (detection) is connected with ac power output respectively by the former limit of isolating transformer B1; secondary is output as direct current 9V, and described rectifier anode output links to each other with an end of capacitor C 1, C2, diode D1,9V direct current relay KA coil, resistance R 2 and electrode input end 3 pin of Voltage stabilizing module.Output 1 pin of Voltage stabilizing module 7806 is connected with the A end of capacitor C 5, C6, resistance R 7 one ends and the detection conductor R* that leaks.Isolating transformer B1 secondary rectifier cathode output end and capacitor C 1 ~ C8, negative input 2 pin of the other end of resistance R 1, R3, R4, R8, R9 and Voltage stabilizing module 7806 are connected.The anodal pin of computing module LM324 is connected with the positive pole of diode D3 negative pole, diode D4 positive pole, capacitor C 8, an end of resistance R 5, an end common ground of the other end of resistance R 5 and resistance R 8; The negative pole pin of computing module LM324 is connected with the positive pole of diode D3 positive pole, diode D4 negative pole, capacitor C 7, an end of resistance R 6, and the other end of resistance R 6 is connected with the common port of resistance R 7, resistance R 8; The output pin of computing module LM324 is connected with the positive pole of capacitor C 4, an end of resistance R 3 with resistance R 4 series connection backs with diode D2 is anodal, inserts the gate pole of controllable silicon T1 at last.The anode of controllable silicon T1 joins with positive pole, capacitor C 3 one ends (other end of capacitor C 3 links to each other with resistance R 1), the LED negative pole of the direct current relay KA coil other end, diode D1, and the positive pole of LED is connected with the other end of resistance R 2.
In the scheme that the utility model technical problem adopted: 1, material requested and element: small-power controllable silicon, 220V/9V low pressure isolating transformer, 9V D.C. contactor, 5 polar capacitors, 3 polarity free capacitors, 8 resistance, 1 power module of voltage regulation, 1 computing amplification module, 4 general-purpose diodes, 1 light-emitting diode, leak and detect conductor (with naked copper lead wire producing) etc.2, detect, protect circuit connection: utilizing leaks detects conductor and casing formation humistor loop.Get this signal of telecommunication with the balance bridge circuit of making, after filtering,, remove to trigger controllable silicon T1 to operational amplifier LM324 amplification, thus adhesive 9V direct current relay.The normally closed electric shock of this relay disconnects circuit for controlling motor, cuts off the electricity supply, thus autostop, 9V direct current relay normally opened contact is connected sound light alarming circuit simultaneously, and operating personnel can in time find to take measures the fault point, avoid accident further to enlarge.Wherein, leak and detect conductor with single (￠ 0.75mm) naked copper wire producing, detect the installation of conductor R* for the ease of leaking, for the naked copper lead is twined a circle along the lower surface of submersible motor stator winding, in stator slot, pass, twine a circle again along the stator winding upper surface, an end is connected with the A end of amplifying circuit 3 after at last this lead being added the cover insulating sleeve, the other end is as the special-purpose earth connection of motor cable but do not join with motor upper cover, like this, whole stator winding will constitute a whole leakage inspector among the encirclement of the detection conductor R* that leaks.Leak and detect conductor R* and proof submersible sand discharging pump casing insulation, the casing earthing of casing.Just often owing to be full of cold oil in the motor for submerged pump, then checkout gear immerses in the oil fully, and and casing between be high resistance, after motor seal lost efficacy, water entered motor, leaked this moment to detect conductor R* and casing has constituted a humistor.Resistance increases along with the ratio of water in the oil pocket and diminishes, and submersible motor is laid earth connection outward again.Electronic devices and components are welded on the printed substrate, are fixed in the can earthing of casing.
Its major loop is identical with the conventional motors startup, comprises circuit breaker Q F, A.C. contactor KM, thermal relay FR.
Detect, the protection control principle: when water seal, sealing gasket lost efficacy or after other reason leaked, water entered motor or oil pocket, resistance increases along with the ratio of water in the oil pocket and diminishes.After leaking, oil water mixture splashes between probe and the casing, detect conductor R* and drop to the casing insulation resistance when probe promptly leaks＜during 1M Ω, leak stop moves, the fast shut-off pump power.Leak and detect conductor R* and casing formation humistor loop.Get this signal of telecommunication with the balance bridge circuit, after filtering,, remove to trigger controllable silicon T1 to the operational amplifier amplification, thus adhesive 9V direct current relay KA.The normally closed electric shock of this relay K A disconnects circuit for controlling motor 6, cuts off the electricity supply, thus autostop, the auxiliary relay normally opened contact is connected sound light alarming circuit simultaneously, and operating personnel can in time find to take measures the fault point, avoid accident further to enlarge.Electrical schematic diagram as shown in Figure 1 and Figure 2.
Claims (3)
1. a submersible sewage pump motor water inlet detects and the protection control device; comprise power circuit (1); voltage stabilizing circuit (2); amplifying circuit (3); leak and detect conductor (4); proof submersible sand discharging pump motor main circuit (5); proof submersible sand discharging pump motor control loop (6); the submersible sewage pump motor stops indicator light (7); submersible sewage pump motor run indicator (8); it is characterized in that: described submersible sewage pump motor water inlet detects and protects the output of the power circuit (1) of control device to be connected with the input of voltage stabilizing circuit (2); the output of voltage stabilizing circuit (2) is connected with the input of amplifying circuit (3); the output A end of amplifying circuit (3) is connected with detection conductor (4) one ends that leak, and detection conductor (4) other end that leaks is arranged in the proof submersible sand discharging pump motor case.
2. submersible sewage pump motor water inlet according to claim 1 detects and the protection control device, it is characterized in that: described submersible sewage pump motor water inlet detects and the former limit of power circuit (1) isolating transformer B1 of protection control device is connected with ac power output, and secondary is exported direct current 9V behind rectifier rectification; Described voltage stabilizing circuit (2) is connected with the cathode output end of rectifier and is connected with electrode input end 3 pin of Voltage stabilizing module 7806 with an end of capacitor C 1, C2, diode D1,9V DC power supply relay K A coil one end, resistance R 2; Output 1 pin of Voltage stabilizing module 7806 is connected with the A end of capacitor C 5, C6, resistance R 7 one ends and the detection conductor R* that leaks; Described power circuit (1) isolating transformer B1 secondary cathode output end and capacitor C 1 ~ C8 behind rectifier rectification, negative input 2 pin of the other end of resistance R 1, R3, R4, R8, R9 and Voltage stabilizing module 7806 connect; The anodal pin of described amplifying circuit (2) computing module LM324 is connected with the positive pole of diode D3 negative pole, diode D4 positive pole, capacitor C 8, an end of resistance R 5, an end common ground of the other end of resistance R 5 and resistance R 8; The negative pole pin of computing module LM324 is connected with the positive pole of diode D3 positive pole, diode D4 negative pole, capacitor C 7, an end of resistance R 6, and the other end of resistance R 6 is connected with the common port of resistance R 7, resistance R 8; The output pin 1 of computing module LM324 is connected with the positive pole of capacitor C 4, an end of resistance R 3 with resistance R 6 series connection backs with diode D2 is anodal, inserts the gate pole of controllable silicon T1 at last; The anode of controllable silicon T1 is connected with the coil other end, the positive pole of diode D1, capacitor C 3 one ends of direct current relay KA, and capacitor C 3 other ends link to each other with resistance R 1, the LED negative pole joins, and the positive pole of LED is connected with the other end of resistance R 2.
3. described submersible sewage pump motor water inlet detects and protective device according to claim; it is characterized in that: a circle is twined in the lower surface that the described detection conductor R* that leaks adopts the naked copper lead to make and be wound on the immersible pump stator winding; in stator slot, pass; twine a circle again along the stator winding upper surface; leak and detect on the conductor R* wire sleeve that the one end is connected with amplifying circuit (3) output terminals A end behind the insulating sleeve, the other end is unsettled to be arranged in the proof submersible sand discharging pump motor case.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011200325255U CN202068173U (en) | 2011-01-30 | 2011-01-30 | Water inlet detection and protection device of submersible sewage pump motor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011200325255U CN202068173U (en) | 2011-01-30 | 2011-01-30 | Water inlet detection and protection device of submersible sewage pump motor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202068173U true CN202068173U (en) | 2011-12-07 |
Family
ID=45062026
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2011200325255U Expired - Lifetime CN202068173U (en) | 2011-01-30 | 2011-01-30 | Water inlet detection and protection device of submersible sewage pump motor |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202068173U (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103094882A (en) * | 2013-02-02 | 2013-05-08 | 浙江大元泵业有限公司 | Three-phase large-power immersible pump motor protection system |
| CN104037969A (en) * | 2014-06-10 | 2014-09-10 | 国网四川省电力公司双流县供电分公司 | Water leakage protection system used for motor |
| CN109443652A (en) * | 2018-12-16 | 2019-03-08 | 山西汾西重工有限责任公司 | Deep-sea aircraft promotes mainly motor water pressure test leak water detdction circuit and detection method |
| CN111425413A (en) * | 2020-04-10 | 2020-07-17 | 中建四局安装工程有限公司 | Combined type electric control protection structure combined with drainage pump body and method thereof |
-
2011
- 2011-01-30 CN CN2011200325255U patent/CN202068173U/en not_active Expired - Lifetime
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103094882A (en) * | 2013-02-02 | 2013-05-08 | 浙江大元泵业有限公司 | Three-phase large-power immersible pump motor protection system |
| CN104037969A (en) * | 2014-06-10 | 2014-09-10 | 国网四川省电力公司双流县供电分公司 | Water leakage protection system used for motor |
| CN104037969B (en) * | 2014-06-10 | 2016-06-08 | 国网四川省电力公司双流县供电分公司 | For the safeguard system that leaks of motor |
| CN109443652A (en) * | 2018-12-16 | 2019-03-08 | 山西汾西重工有限责任公司 | Deep-sea aircraft promotes mainly motor water pressure test leak water detdction circuit and detection method |
| CN109443652B (en) * | 2018-12-16 | 2024-04-26 | 山西汾西重工有限责任公司 | Water leakage detection circuit and detection method for hydraulic test of main thrust motor of deep sea aircraft |
| CN111425413A (en) * | 2020-04-10 | 2020-07-17 | 中建四局安装工程有限公司 | Combined type electric control protection structure combined with drainage pump body and method thereof |
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|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
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| CX01 | Expiry of patent term |
Granted publication date: 20111207 |