CN105544151B - A kind of automatic control drainage device - Google Patents
A kind of automatic control drainage device Download PDFInfo
- Publication number
- CN105544151B CN105544151B CN201610060378.XA CN201610060378A CN105544151B CN 105544151 B CN105544151 B CN 105544151B CN 201610060378 A CN201610060378 A CN 201610060378A CN 105544151 B CN105544151 B CN 105544151B
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- Prior art keywords
- screw rod
- direct current
- current generator
- sealing element
- worm
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
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- 238000007789 sealing Methods 0.000 claims abstract description 55
- 230000007246 mechanism Effects 0.000 claims abstract description 25
- 230000003449 preventive effect Effects 0.000 claims abstract description 10
- 230000005540 biological transmission Effects 0.000 claims abstract description 5
- 230000000903 blocking effect Effects 0.000 claims description 14
- 230000006835 compression Effects 0.000 claims description 2
- 238000007906 compression Methods 0.000 claims description 2
- 230000033001 locomotion Effects 0.000 abstract description 13
- 238000004519 manufacturing process Methods 0.000 abstract description 7
- 238000005406 washing Methods 0.000 description 11
- 238000010586 diagram Methods 0.000 description 6
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 5
- 241000237858 Gastropoda Species 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 239000003638 chemical reducing agent Substances 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 206010034703 Perseveration Diseases 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 230000007257 malfunction Effects 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
Classifications
-
- D—TEXTILES; PAPER
- D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
- D06F—LAUNDERING, DRYING, IRONING, PRESSING OR FOLDING TEXTILE ARTICLES
- D06F39/00—Details of washing machines not specific to a single type of machines covered by groups D06F9/00 - D06F27/00
- D06F39/08—Liquid supply or discharge arrangements
- D06F39/081—Safety arrangements for preventing water damage
-
- D—TEXTILES; PAPER
- D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
- D06F—LAUNDERING, DRYING, IRONING, PRESSING OR FOLDING TEXTILE ARTICLES
- D06F37/00—Details specific to washing machines covered by groups D06F21/00 - D06F25/00
- D06F37/30—Driving arrangements
- D06F37/304—Arrangements or adaptations of electric motors
-
- D—TEXTILES; PAPER
- D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
- D06F—LAUNDERING, DRYING, IRONING, PRESSING OR FOLDING TEXTILE ARTICLES
- D06F39/00—Details of washing machines not specific to a single type of machines covered by groups D06F9/00 - D06F27/00
- D06F39/08—Liquid supply or discharge arrangements
- D06F39/083—Liquid discharge or recirculation arrangements
-
- D06F2204/084—
Landscapes
- Engineering & Computer Science (AREA)
- Textile Engineering (AREA)
- Transmission Devices (AREA)
Abstract
The invention discloses a kind of automatic control drainage devices, including water-drainage tube part, sealing element, direct current generator, worm screw, worm gear, screw rod and the first shell, the cephalic par of the screw rod is fixedly connected with sealing element, the sealing element is disposed adjacent with water-drainage tube part, the direct current generator is connect with worm drive, the worm and wheel is meshed, the worm gear is connect with screw rod transmission, keep screw rod reciprocating by rotation preventive mechanism, band dynamic seal moves together, make at regular intervals in being tightly connected or having between sealing element and water-drainage tube part, realization sealing or draining.Rationally, direct current generator replaces alternating current generator, and securely and reliably, cost is lower for structure of the invention design；Slowed down by worm and gear, then by screw rod transmission, obtains bigger axial movement power after so that the torque of direct current generator is converted into linear motion, can effectively ensure that the leakproofness of sealing ring, effectively reduce production process, and reduce production cost.
Description
Technical field
The present invention relates to a kind of drainage arrangement, in particular to a kind of automatic control applied to electric appliances such as washing machines drains dress
It sets, belongs to automatic control equipment technical field.
Background technique
It needs to be equipped with controllable electric drainage device in self-draining electric appliance at work.By taking washing machine as an example,
Washing machine is acted on using electric energy production machinery to wash the cleaning appliance of clothing.During doing washing clothes, the row of closing is needed
Water installations impregnate clothes in water, pledge clothes after washing, it is necessary to open drainage arrangement and the water in washing drum is all arranged
Out.
Existing drainer for washer, the general rotary motion using motor, by gear shift at the straight of connecting rod
Line movement, both ends move back and forth, to realize opening and closing discharge outlet, the sealing of water fully relies on sealing ring and passes through spring
Pressure effect.Consider that the factor and integral strength of cost, this scheme can not use the biggish spring of pressure ratio, because this
It is inadequate that sample will lead to sealed pressure, when having fraction lint or impurity to remain in sealing surfaces, will lead to sealing and loses
Effect, to make washing machine cisco unity malfunction.
Moreover, the motor of existing washing machine transmits power, structure after multiple stage gear reduction, then through link mechanism
It is more complicated.
Furthermore existing washing machine drives using AC220V alternating current generator, more demanding for fire-proof and water-proof, not so
Safety problem is easily caused, and not can control direction of rotation, there must be 2 groups of break contacts that it is made to close and open in the structure
It stops operating when position, and existing high voltage and contact structure, security and reliability be not all relatively high, to reduce use
Flexible performance, and the higher cost used is not able to satisfy the demand of social development.
In view of this, how to provide a kind of sealing performance and the better automatic control drainage device of safety, become industry
The current urgent problem to be solved in boundary.
Summary of the invention
Place in view of the above-mentioned deficiencies in the prior art, the purpose of the present invention is to provide a kind of automatic control drainings
Device, it is structurally reasonable, it can effectively ensure that the leakproofness of sealing ring, it is securely and reliably, low in cost.
In order to achieve the above object, the technical solution that the present invention takes includes：
A kind of automatic control drainage device, including water-drainage tube part, sealing element, direct current generator, worm screw, worm gear, screw rod and
The cephalic par of one shell, the screw rod is fixedly connected with sealing element, and the sealing element is disposed adjacent with water-drainage tube part, the direct current
Motor is connect with worm drive, and the worm and wheel is meshed, and the worm gear is connect with screw rod transmission, is made by rotation preventive mechanism
Screw rod is reciprocating, and band dynamic seal moves together, makes certain in being tightly connected or having between sealing element and water-drainage tube part
Spacing realizes sealing or draining.
One of as a preferred solution of the present invention, the rotation preventive mechanism includes two opposite rotation stops being set on worm gear
Platform and the matching blocking surface for being respectively arranged at screw both end cooperated with the rotation stop platform match blocking pin, the silk
It is also corresponding on bar to offer rotation stop groove, when screw rod band dynamic seal travels forward, matching blocking surface and one on worm gear of screw rod
Rotation stop contact with platform, screw rod stop operating, and water-drainage tube part is compressed and realizes sealing by sealing element；Screw rod band dynamic seal moves backward
When, matching blocking pin and another rotation stop contact with platform on worm gear of screw rod, screw rod stop operating, and sealing element and water-drainage tube part are de-
From at regular intervals, realization draining.
As one of another preferred embodiment of the invention, the rotation preventive mechanism includes the first limit being set on the first shell
Bit switch, the second limit switch and limit baffle, the limit baffle are fixedly installed on screw rod, and screw rod moves to sealing element
When water-drainage tube part is compressed sealing one end, limit baffle is contacted with the first limit switch, direct current generator power-off；Screw rod moves to close
When sealing and water-drainage tube part are detached from one end, limit baffle is contacted with the second limit switch, direct current generator power-off.
More preferably, the outer surface of the screw rod is provided with helicla flute, the side of the helicla flute include opening face with
Locking face, the angle of the locking face are greater than the angle in opening face.
Specifically, the angle in the opening face is 90 °, the angle of the locking face is greater than 90 °.
Further, the direct current generator is connect with control mechanism, and control mechanism detects the electric current inside direct current generator, control
The positive and negative rotation of direct current generator processed.
Further, the outside of the direct current generator is additionally provided with a second housing.
Preferably, the front side of the worm gear is additionally provided with screw rod positioning plastic part.
More specifically, the limit baffle is fixedly installed on screw rod by a screw.
Compared with prior art, the beneficial effects of the present invention are：
1. structure of the invention design is rationally, direct current generator replaces alternating current generator, and the voltage between 3V~24V is ok,
Safety significantly improves, and reinforces fire-proof and water-proof requirement without doing, securely and reliably, cost is lower.
2. not complicated gear of the invention adds the combined speed reducer structure of connecting rod, only one group of worm and gear adds subtracting for screw rod
Fast mechanism, it is simple and reliable for structure, the small torque of direct current generator, slowed down by worm and gear, then by screw rod transmission, make direct current
The torque of motor obtains bigger axial movement power after being converted into linear motion, is amplified to bigger pressing force, can be effective
The leakproofness for guaranteeing sealing ring, the seepy question for avoiding occurring because pressure is too small (prior art sealed pressure only has 1.5~
2.5 kilograms, the present invention can easily reach 10~20 kilograms of sealed pressure)；Production process can be effectively reduced, and reduces production
Cost.
Detailed description of the invention
Structure to illustrate the invention with reference to the accompanying drawing makees in further detail a specific embodiment of the invention
Explanation.
Fig. 1 is one of a kind of structural schematic diagram of automatic control drainage device disclosed in one embodiment of the present invention；
Fig. 2 is a kind of second structural representation of automatic control drainage device disclosed in one embodiment of the present invention；
Fig. 3 is a kind of structural schematic diagram of automatic control drainage device disclosed in another preferred embodiment of the present invention；
Fig. 4 is one of worm and wheel attachment structure schematic diagram disclosed in one embodiment of the present invention；
Fig. 5 is two of worm and wheel attachment structure schematic diagram disclosed in one embodiment of the present invention；
Fig. 6 is screw rod structure schematic diagram disclosed in one embodiment of the present invention；
Fig. 7 is the enlarged structure schematic diagram in the opening face and locking face of screw rod in Fig. 1.
Description of symbols：1- water-drainage tube part, 2- sealing element, 3- direct current generator, 30- second housing, 4- worm screw, 5- snail
Wheel, 50- rotation stop platform, 6- screw rod, 61- matching blocking surface, 62- matching blocking pin, 63- rotation stop groove, 64- helicla flute, 64a- are beaten
Open face, 64b- locking face, the first shell of 7-, the first limit switch of 81-, the second limit switch of 82-, 83- limit baffle, 84- spiral shell
Nail, 9- screw rod position plastic part.
Specific embodiment
Below in conjunction with the attached drawing in the present embodiment, the technical solution in embodiment specifically, clearly and completely retouch
It states.
A kind of automatic control drainage device disclosed by the invention, including water-drainage tube part 1, sealing element 2, direct current generator 3, worm screw
4, worm gear 5, screw rod 6 and the first shell 7, the cephalic par of the screw rod 6 are fixedly connected with sealing element 2, the sealing element 2 and draining
Pipe fitting 1 is disposed adjacent, and the direct current generator 3 is drivingly connected with worm screw 4, and the worm screw 4 is meshed with worm gear 5, the worm gear 5 and
Screw rod 6 be sequentially connected, keep screw rod 6 reciprocating by a rotation preventive mechanism, band dynamic seal 2 move together, make sealing element 2 with
It is at regular intervals in being tightly connected or having between water-drainage tube part 1, to realize sealing or draining.
It please refers to shown in Fig. 1-2 and Fig. 4-7, in one embodiment of the present invention, the rotation preventive mechanism includes being set to snail
Two opposite rotation stop platforms 50 on wheel 5 are with for being respectively arranged at 6 both ends of screw rod of section and the rotation stop platform 50 cooperation
With blocking surface 61, matching blocking pin 62, also correspondence offers rotation stop groove 63 on the screw rod 6.The outer surface of the screw rod 6 is arranged
There is helicla flute 64, the side of the helicla flute 64 includes opening face 64a and locking face 64b, and the angle of the locking face 64b is greater than
The angle of opening face 64a.Specifically, the angle in the opening face is 90 °, the angle of the locking face is greater than 90 °.In helicla flute
Two sides use asymmetric design, and locking face angle with opening face angle degree, after screw thread being effectively prevent to screw, then is inverted and just revolved greatly
The problem of not opening.
When screw rod 6 moves to one end, compresses such as sealing element 2, the matching of rotation stop platform corresponding thereto stops face contact,
Prevent screw rod 6 from continuing to move, while bearing whole torsion, prevent two helicla flutes from lock because of coupling mechanism force, prevent from turning round when
Time is revolved not open；When screw rod 6 moves to the other end, act on identical.
The direct current generator 3 is connect with a control mechanism, and control mechanism detects the electric current inside direct current generator, controls direct current
The positive and negative rotation of motor.The outside of the direct current generator 3 is additionally provided with a second housing 30.The front side of the worm gear is also set up
There is screw rod to position plastic part 9.
When needing to seal, the control mechanism of washing machine is powered to direct current generator 3 is positive, and direct current generator 3 rotates forward, and drives
Dynamic worm screw 4 drives worm gear 5 to rotate, and worm gear 5 drives screw rod 6 mobile, and band dynamic seal 2 travels forward screw rod 6 again, and sealing element 2 will
Water-drainage tube part 1 compresses, and realizes sealing, the matching blocking surface on screw rod 6 is contacted with the rotation stop platform 50 on worm gear 5 at this time, silk
Bar stops operating, and direct current generator can also stall, and control mechanism can detect that the electric current in direct current generator significantly increases, and cuts off at once
A sealing movement is completed in power supply.
When needing to drain, the control mechanism of washing machine gives direct current generator 3 reverse power supply, and direct current generator 3 inverts, and drives snail
Bar 4 drives worm gear 5 to rotate, and worm gear 5 drives screw rod 6 again, and screw rod 6 moves backward with dynamic seal 2, pulls open sealing element 2, makes to seal
Part and the disengaging of water-drainage tube part 1 have certain spacing, to realize drain function.The matching blocking pin 62 of screw rod 6 and worm gear 5 at this time
On the contact of another rotation stop platform 50, screw rod 6 stops operating, and direct current generator can also stall, and control mechanism can detect direct current
Electric current in machine significantly increases, at once cutting power supply, completes another draining movement.
Direct current generator has two kinds of driving methods of positive and negative rotation, electric when forward driving by the positive and negative rotation of the above direct current generator
Machine rotates forward, and so that screw rod is compressed sealing element, plays sealing function, the motor reversal when being driven in the reverse direction retreats screw rod, pulls open sealing
Part drains water.In this way, the perseveration realizing sealing and pulling open, reaches the requirement of drainer for washer.
The present invention replaces alternating current generator with direct current generator, and the voltage between 3V~24V is ok, and safety obviously mentions
Height reinforces fire-proof and water-proof requirement without doing, and securely and reliably, cost is lower.
It is shown in Figure 3, it is another preferred embodiment of the invention, the limit method that screw rod moves to both ends is different.Institute
State rotation preventive mechanism include the first limit switch 81 being set on the first shell, the second limit switch 82 and limit baffle 83,
The limit baffle 83 is fixedly installed on screw rod 6 by a screw 84, is linked to be an entirety.
When screw rod 6 moves to sealing element 2, and water-drainage tube part 1 is compressed sealing one end, limit baffle 83 contact first
Limit switch 81, control mechanism directly disconnects the power supply of direct current generator or the first limit switch 81 connects to control mechanism one
Signal is touched, then disconnects the power supply of direct current generator by it, realizes a sealing movement.
When screw rod 6 moves to sealing element 2 and water-drainage tube part 1 is detached from one end, baffle 83 and the second limit switch 82 are limited
A sealing movement is realized in contact, same principle, direct current generator power-off.The screw rod of the present embodiment moves to both ends using limit
It switchs and is powered off to direct current generator, to realize reciprocating motion.
In conclusion the not complicated gear of the present invention adds the combined speed reducer structure of connecting rod, only one group of worm and gear adds
The deceleration mechanism of screw rod, it is simple and reliable for structure, the small torque of direct current generator, slowed down by worm and gear, then passed by screw rod
It is dynamic, bigger axial movement power is obtained after so that the torque of direct current generator is converted into linear motion, is amplified to bigger compression
Power can effectively ensure that the leakproofness of sealing ring, and avoiding the seepy question occurred because pressure is too small, (prior art sealed pressure is only
There are 1.5~2.5 kilograms, the present invention can easily reach 10~20 kilograms of sealed pressure)；Production process can be effectively reduced, and
Reduce production cost.
Above-mentioned specific embodiment is a better embodiment, only technical concept and design feature to illustrate the invention,
Purpose is that person skilled in the art can implement accordingly, is not limited the scope of the invention with this.It is all
Any equivalent change or modification that Spirit Essence according to the present invention is done, should all be included within the scope of protection of the present invention.
Claims (7)
1. a kind of automatic control drainage device, which is characterized in that the automatic control drainage device include water-drainage tube part, sealing element,
Direct current generator, worm screw, worm gear, screw rod and the first shell, the cephalic par of the screw rod are fixedly connected with sealing element, the sealing element
Be disposed adjacent with water-drainage tube part, the direct current generator is connect with worm drive, and the worm and wheel is meshed, the worm gear with
Screw rod transmission connection, keeps screw rod reciprocating by rotation preventive mechanism, and band dynamic seal moves together, makes sealing element and drainpipe
It is at regular intervals in being tightly connected or having between part, realize sealing or draining；The outer surface of the screw rod is provided with helicla flute,
The side of the helicla flute includes opening face and locking face, and the angle of the locking face is greater than the angle in opening face；
The rotation preventive mechanism includes two opposite rotation stop platforms being set on worm gear and cooperates with the rotation stop platform
It is respectively arranged at matching blocking surface, the matching blocking pin of screw both end, also correspondence offers rotation stop groove, screw rod band on the screw rod
When dynamic seal travels forward, matching blocking surface and the rotation stop contact with platform on worm gear of screw rod, screw rod stop operating, seal
Water-drainage tube part is compressed and realizes sealing by part；When screw rod band dynamic seal moves backward, on the matching blocking pin and worm gear of screw rod
Another rotation stop contact with platform, screw rod stop operating, and sealing element is detached from regular intervals, realization draining with water-drainage tube part.
2. a kind of automatic control drainage device according to claim 1, which is characterized in that the rotation preventive mechanism includes setting
In the first limit switch on the first shell, the second limit switch and limit baffle, the limit baffle are fixedly installed on silk
On bar, when screw rod moves to sealing element for water-drainage tube part compression sealing one end, limit baffle is contacted with the first limit switch, direct current
Motor power-off；Screw rod moves to sealing element and when water-drainage tube part is detached from one end, and limit baffle is contacted with the second limit switch, direct current
Motor power-off.
3. a kind of automatic control drainage device according to claim 1, which is characterized in that the angle in the opening face is
90 °, the angle of the locking face is greater than 90 °.
4. a kind of automatic control drainage device according to claim 1, which is characterized in that the direct current generator and control machine
Structure connection, control mechanism detect the electric current inside direct current generator, control the positive and negative rotation of direct current generator.
5. a kind of automatic control drainage device according to claim 1 or 4, which is characterized in that outside the direct current generator
Portion is additionally provided with a second housing.
6. a kind of automatic control drainage device according to claim 1, which is characterized in that the front side of the worm gear is also
It is provided with screw rod positioning plastic part.
7. a kind of automatic control drainage device according to claim 2, which is characterized in that the limit baffle passes through a spiral shell
Nail is fixedly installed on screw rod.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610060378.XA CN105544151B (en) | 2016-01-28 | 2016-01-28 | A kind of automatic control drainage device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610060378.XA CN105544151B (en) | 2016-01-28 | 2016-01-28 | A kind of automatic control drainage device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN105544151A CN105544151A (en) | 2016-05-04 |
| CN105544151B true CN105544151B (en) | 2018-11-16 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201610060378.XA Expired - Fee Related CN105544151B (en) | 2016-01-28 | 2016-01-28 | A kind of automatic control drainage device |
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| Country | Link |
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| CN (1) | CN105544151B (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106224627B (en) * | 2016-08-30 | 2018-09-18 | 苏州威士德电子有限公司 | A kind of drain valve automatically controlled |
| CN107120906B (en) * | 2017-03-22 | 2019-05-31 | 青岛海尔股份有限公司 | Refrigerator and conduit assembly for refrigerator |
| CN107740250B (en) * | 2017-11-13 | 2022-09-23 | 无锡小天鹅电器有限公司 | A dehydration bucket barrier mechanism and washing machine for washing machine |
| CN109959534B (en) * | 2019-04-25 | 2024-01-26 | 安徽省引江济淮集团有限公司 | Bidirectional soil sample pushing device |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1517582A (en) * | 2003-01-08 | 2004-08-04 | 株式会社龟屋工业所 | Drainage valve switching device and washing machine having the drainage valve swithing device |
| CN203700800U (en) * | 2014-01-28 | 2014-07-09 | 安徽意华电器有限公司 | Integrated intelligent control drain valve for washing machine |
| CN205474454U (en) * | 2016-01-28 | 2016-08-17 | 高本东 | Automatic control drainage device |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100205679B1 (en) * | 1997-05-12 | 1999-07-01 | 구자홍 | The drain apparatus of a washing machine |
| KR20000008337A (en) * | 1998-07-13 | 2000-02-07 | 구자홍 | Draining device for washing machine |
| JP2001340693A (en) * | 2000-06-02 | 2001-12-11 | Hitachi Ltd | Drain valve |
-
2016
- 2016-01-28 CN CN201610060378.XA patent/CN105544151B/en not_active Expired - Fee Related
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1517582A (en) * | 2003-01-08 | 2004-08-04 | 株式会社龟屋工业所 | Drainage valve switching device and washing machine having the drainage valve swithing device |
| CN203700800U (en) * | 2014-01-28 | 2014-07-09 | 安徽意华电器有限公司 | Integrated intelligent control drain valve for washing machine |
| CN205474454U (en) * | 2016-01-28 | 2016-08-17 | 高本东 | Automatic control drainage device |
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| CN105544151A (en) | 2016-05-04 |
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Effective date of registration: 20210726 Address after: 215000 90 Shengpu Jiangpu Road, Suzhou Industrial Park, Jiangsu Province Patentee after: HUDSON (SUZHOU) WATER TECHNOLOGY Co.,Ltd. Address before: Room 910, unit 1, building 2 and office 1, Shimao square, Yunlong District, Xuzhou City, Jiangsu Province, 221000 Patentee before: Xuzhou Zhicheng Accounting Service Co.,Ltd. |
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