CN206831811U - A kind of high-efficiency washing hot water apparatus - Google Patents
A kind of high-efficiency washing hot water apparatus Download PDFInfo
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- CN206831811U CN206831811U CN201720702386.XU CN201720702386U CN206831811U CN 206831811 U CN206831811 U CN 206831811U CN 201720702386 U CN201720702386 U CN 201720702386U CN 206831811 U CN206831811 U CN 206831811U
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- water
- scale
- heater
- pipe
- cabinet
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Abstract
A kind of high-efficiency washing hot water apparatus, including cabinet, electric heater with thermostat, water pump, converter valve, external cold water pipe, external hot-water line, drainpipe, water inlet pipe, screen pack, draining valve etc..The utility model does not have to the machine that dismounting water heater can just clean incrustation scale to water heater, can ensure that scale remover plays optimum efficiency, water and scale remover are all circulation Reusabilities, using water wisely, save scale remover, reduce the discharge of sewage.The utility model can be automatically water heater scale removal, and human contact's scale remover chance is few, reduce injury of the acid to human body.Electronic Control converter valve is changed the direction of a stream of water, and can be advantageous to discharge scale particles thing, blowdown is more thoroughly from delivery port blowdown and can from water inlet blowdown.Temperature controlled heater thermal-stable water temperature, beneficial to scale remover scale removal in suitable water temperature, improve scale removal efficiency.The utility model is compact-sized, is easily carried, and is brought convenience for family's place use.
Description
Technical field
The present invention relates to a kind of cleaning device, and relating in particular to a kind of dismounting water heater that do not have to can just clean to water heater
The machine of incrustation scale, can ensure that scale remover plays optimum efficiency, water heater incrustation scale removed, and can using water wisely, reduce blowdown
A kind of high-efficiency washing hot water apparatus.
Background technology
The method of existing water heater incrustation scale cleaning is：First have to open outer cover of water heater, it is then careful that water heater is torn open
Remove, the aqueous solution for being made into scale remover fills water heater, after standing a period of time, bleeds off the water in water heater, so weight
Multiple multiple, the incrustation scale in water heater will be fewer and fewer.Whole process it is noted that：Water heater is not dismounted badly.When acid filling is cleaned,
Acid-proof gloves are worn, prevent acid burn hand.Water heater back warp often has an incrustation scale, maintenance master worker through tearing open water heater, wash water heater,
Water heater is assembled again, and the time of half a day can only clear up the incrustation scale of a water heater, and efficiency is very low, and work is also very tired.
The content of the invention
The purpose of the present invention is overcome the deficiencies in the prior art part, there is provided one kind does not have to dismounting water heater just can be to hot water
Device cleans the machine of incrustation scale, can ensure that scale remover plays optimum efficiency, water heater incrustation scale is removed, and can using water wisely, reduction
A kind of high-efficiency washing hot water apparatus of blowdown.
The technical solution adopted for the present invention to solve the technical problems is：A kind of high-efficiency washing hot water apparatus, including machine
Case, cabinet upper right quarter fix water tank, cabinet right lower quadrant installation electric heater with thermostat, cabinet middle and lower part installation water pump, cabinet upper left
Converter valve is installed in portion, and external cold water pipe and external hot-water line are fixed in the left top of cabinet, and cabinet right edge fixes drainpipe.Water tank top
Portion's fixed water inlet pipe, water tank middle part are built-in with screen pack, sewage and incrustation scale are equipped with below screen pack, filtering is equipped with above screen pack
Water, water tank bottom right side are equipped with drainpipe, and draining valve is equipped with drainpipe, return duct, water tank bottom are equipped with the left of water tank bottom
Outlet pipe is equipped with, outlet pipe top is arranged on above screen pack.Electric heater with thermostat upper end is connected to the bottom of outlet pipe, temperature control
Electric heater lower end is connected to connecting tube one end, and the connecting tube other end is connected to water pump inlet, the connection pressurization of water pump water outlet end
Pipe one end, the forcing pipe other end are connected to one end under converter valve, and the other end is connected to return duct one end under converter valve, and return duct is another
One end is connected on the left of water tank bottom, and one end is connected to external cold water pipe in converter valve, and the other end is connected to external in converter valve
Hot-water line.
The invention has the advantages that can just clean the machine of incrustation scale to water heater without dismantling water heater, it can ensure that and remove
Dirty agent plays optimum efficiency, and water heater incrustation scale is removed, and can using water wisely, reduction blowdown.The present invention is water heater scale removal,
One of cumbersome process of dismounting water heater is saved, reduces workload.The water and scale remover of the present invention is all to circulate to make repeatedly
, using water wisely, scale remover is saved, reduces the discharge of sewage.The present invention can be water heater scale removal automatically, and human contact removes
Dirty agent chance is few, reduces injury of the acid to human body.Electronic Control converter valve is changed the direction of a stream of water, can be from delivery port blowdown and can
From water inlet blowdown, be advantageous to discharge scale particles thing, blowdown is more thoroughly.Temperature controlled heater thermal-stable water temperature, beneficial to scale removal
Agent scale removal in suitable water temperature, improve scale removal efficiency.The present invention is compact-sized, is easily carried, and is brought for family's place use
It is convenient.
Brief description of the drawings
The present invention is further described with reference to the accompanying drawings and examples.
Fig. 1 is the structure chart of embodiments of the invention one.
In figure：1. water inlet pipe, 2. water tanks, 3. screen packs, 4. draining valves, 5. electric heater with thermostat, 6. water pumps, 7. backflows
Pipe, 8. converter valves, 9. external cold water pipes, 10. external hot-water lines, 11. sewage, 12. filter waters, 13. incrustation scales, 14. drainpipes,
15. connecting tube, 16. forcing pipes, 17. cabinets, 18. outlet pipes.
Embodiment
In the embodiment shown in fig. 1, water inlet pipe (1), water tank (2), screen pack (3), draining valve (4), temperature control electricity are provided with
Heater (5), water pump (6), return duct (7), converter valve (8), external cold water pipe (9), external hot-water line (10), sewage (11),
Filter water (12), incrustation scale (13), drainpipe (14), connecting tube (15), forcing pipe (16), cabinet (17), outlet pipe (18).
Implement a kind of high-efficiency washing hot water apparatus of the present invention, including cabinet (17), cabinet (17) upper right quarter fixes water
Case (2), cabinet (17) right lower quadrant installation electric heater with thermostat (5), cabinet (17) middle and lower part installation water pump (6), cabinet (17) are left
External cold water pipe (9) and external hot-water line (10) are fixed in top installation converter valve (8), the left top of cabinet (17), and cabinet (17) is right
Drainpipe (14) is fixed in side.
Implement a kind of high-efficiency washing hot water apparatus of the present invention, fixed water inlet pipe (1) at the top of water tank (2), in water tank (2)
Portion is built-in with screen pack (3), and screen pack (3) is equipped with sewage (11) and incrustation scale (13) below, and screen pack (3) is equipped with filter water above
(12), water tank (2) bottom right is equipped with drainpipe (14), and draining valve (4), water tank (2) bottom left are equipped with drainpipe (14)
Return duct (7) is equipped with, water tank (2) bottom is equipped with outlet pipe (18), and outlet pipe (18) top is arranged on screen pack (3) above.
Implement a kind of high-efficiency washing hot water apparatus of the present invention, electric heater with thermostat (5) upper end is connected to outlet pipe
(18) bottom, electric heater with thermostat (5) lower end are connected to connecting tube (15) one end, and connecting tube (15) other end is connected to water pump
(6) water inlet end, water pump (6) water side connection forcing pipe (16) one end, it is next that forcing pipe (16) other end is connected to converter valve (8)
To hold, the other end is connected to return duct (7) one end under converter valve (8), and return duct (7) other end is connected to water tank (2) bottom left,
One end is connected to external cold water pipe (9) in converter valve (8), and the other end is connected to external hot-water line (10) in converter valve (8).
Implement a kind of high-efficiency washing hot water apparatus of the present invention, the volume of water tank (2) is at least not less than 2 liters, at most not
More than 20 liters.
Implement a kind of high-efficiency washing hot water apparatus of the present invention, converter valve (8) can use Electronic Control converter valve, the change of current
Valve (8) can also be manual two tubes can intercourse the valves of current, can so change the direction of a stream of water, can be from water outlet
Mouth blowdown and can is advantageous to discharge scale particles thing, blowdown is more thoroughly from water inlet blowdown.
Implement a kind of high-efficiency washing hot water apparatus of the present invention, can just incrustation scale be cleaned to water heater without dismantling water heater
Machine, can ensure that scale remover play optimum efficiency, to water heater incrustation scale remove, and can using water wisely, reduce blowdown.The present invention
For water heater scale removal, one of cumbersome process of dismounting water heater is saved, reduces workload.The water and scale remover of the present invention
All it is circulation Reusability, using water wisely, saves scale remover, reduce the discharge of sewage.The present invention can remove for water heater automatically
Incrustation scale, human contact's scale remover chance is few, reduces injury of the acid to human body.Electronic Control converter valve is changed the direction of a stream of water, can
From delivery port blowdown and can from water inlet blowdown, be advantageous to discharge scale particles thing, blowdown is more thoroughly.Temperature controlled heater heating is steady
Determine water temperature, beneficial to scale remover scale removal in suitable water temperature, improve scale removal efficiency.The present invention is compact-sized, is easily carried, is family
The use of front yard place is brought convenience.
Implement a kind of high-efficiency washing hot water apparatus of the present invention, the ingehious design of the machine component, can be simple with combining
Efficiently remove water heater incrustation scale.The complicated procedures of forming of dismounting is reduced, and energy quickness and high efficiency is water heater scale removal.Reduce workload and
Save the working time, moreover it is possible to prevent harm of the acid to staff.The incrustation scale removed in water heater of energy efficient quick of the invention,
To improve the operating efficiency of water heater.
A kind of high-efficiency washing hot water apparatus embodiment one of the present invention is as follows：
Incrustation scale descaling machine internal structure is determined first：
1st, the present invention will carry a water tank, be filled with water and be easy to add scale remover.Water can also be recycled, saves water money
Source, save scale remover, reduce blowdown.
2nd, the present invention will add a temperature control device, can heat, and make between water temperature reaches 50 to 60 degrees Celsius, scale removal
Agent is better, reaches scale removal effect more preferably, faster.
3rd, the present invention is internal water pump, forms circulating water flow, scale remover is brought into water heater.Play and scrub heat repeatedly automatically
Hydrophone.
4th, the present invention is internal the converter valve changed the direction of a stream of water, and exchanging flushing repeatedly using delivery port and water inlet makes water
Dirty particle is easier to flow out water heater, and can be more beneficial for scale particles from water inlet blowdown and be easier to flow out water heater.
5th, the present invention has filter, filters out scale particles thing, and the water for making to flow into water heater every time is clean.
6th, the present invention has Electronic Control change of current valve gear, easy to operation.
7th, the present invention will have a framework, make that these parts are orderly, compact combine.
8th, other some components for ensuring machine normal work.
Secondly temperature control heating device is determined, is to promote scale remover more effectively to play a role, is easy to quick scale removal.
Temperature control is between 50 to 60 degree.From resistance to sour water pump, the water pump of selection must also have resistance to acid function.As long as consider water to be sent into height
2 meters of right positions.So pump head also need not be too remote.Finally determination Household pressure increasing water pump, 6 meters or so of lift.For
The corrosion of acid is prevented, the every water pipe joint and joint of connection must all select the plastic tube of acid-proof.The connection method of water pipe, can
To do a water circulation system with 4 T-way water valves and 5 water pipes.Joint disposably connects, and makes hot water by the control of valve
Current change direction in device, and vortex is formed in water, drive scale particles to be flowed out with water.Reach and the inside of water heater is carried out entirely
The purpose that orientation is removed.
The specific connection of the present invention is as follows：The Pump Suction mouth of a river is mounted in water tank bottom, sends water in heater in water tank
Heating, then flows out in heater, and is flowed to from water feeding of heater mouth in water heater, then flows back to water from water heater mouth
Case, so circulation.In order to which incrustation scale is more preferably taken out of water heater.One change of current valve is installed, thus it is possible to vary water (flow) direction：Water from
Heater flows out, and is flowed into from water heater mouth in water heater, is then flowed out again from water feeding of heater mouth, reflow tank.
The flushed water heater of the water mixed with scale remover of the present invention, the water flowed back to carry many incrustation scales, many incrustation scales certainly
Pump working can be influenceed, a screen pack must be then installed in the middle part of water tank, it is arranged on below the water inlet pipe mouth of water pump.
The present invention have selected gauze and make filter.Cut one piece of gauze (1 millimeter of mesh) with water tank area equation, fixed peace
In the middle part of water tank.One piece of gauze bag is taken again on outlet pipe top, it is dead with fluid sealant glue.Then outlet pipe bottom is screwed to water tank
On the water inlet of beneath heater.Test effect shows：Twice filter can only filter larger particles incrustation scale, filter effect
It is bad.Therefore a Y type screw thread filter has been added again for machine.It is mounted in towards in the connecting tube of water pump.So flow into water
Water in pump would not carry scale particles, would not also influence the work of water pump.
The present invention is delivery port, water return outlet and the water inlet for the water heater that needs clean is corresponding with delivery port connects.Then
Enough water is piled in water tank, scale remover is added, is closed the lid.Start water pump, the water with scale remover is sent to heater
In start to heat.And send scale remover in water heater, making scale remover, constantly circulation is washed away in water heater, and is often started
Commutation switch, changes water (flow) direction in water heater, and difference can be more beneficial for removing, discharge water from water inlet and delivery port blowdown
Dirt.
The manufacturing process of the present invention is as follows：
1st, machine frame is cleaned：With 3*3 angle bar：6 meters.Intercept 30CM 5, interception 35CM 5, interception 50CM 5.It is whole
Individual machine overall volume should be：Long 35CM, wide 30CM, high 50CM.
2nd, cleaning machine water tank：With interception bore 15CM PVC water pipes, a length of 35CM.Below plus blocking cap one, water is made
Case, water tank is interior to add a water level control bar.Make particle filtering net by oneself again.
3rd, cleaning machine heater：Temp controlling heater one is selected, can use a water heater heater part, high 35CM,
Wide 25CM, thick 10CM, power 700W.
4th, cleaning machine water pump：Choose super century Household pressure increasing water pump 1, maximum flow 16L/min, highest lift 12M. volumes
Constant flow 6L/min, rated head 6M.Rated voltage 220V, rated power 100W water pump.The long 17CM of water pump, diameter 7CM.
5th, cleaning machine water circulation pipeline：Triplet type water pipe head 5, L-shaped water pipe head 4, the connecting tube 7 of 50CM length
Root, 2 of 140CM length.
Present invention completion welding, assembling are as follows：
1st, machine frame makes：First with 3 centimetres of angle bar for multiplying 3 centimetres, interception is long 30 centimetres 5, long 35 centimetres 5,
It is long 50 centimetres 5.Welding is one high 50 centimetres, length 35 centimetres, wide 30 centimetres of cuboid chase.It is each to fixed cleaning machine
Individual part, then fenced up by the use of galvanized iron sheet and be used as cabinet.
2nd, water tank makes：The first step：To market selection, it is determined that doing water tank main body, interception 35 with the pvc pipe of 15 centimetres of bore
The pvc pipe of centimeter length does water tank main body.Second step：The blocking cap (15 centimetres of bore in blocking cap) of a pvc pipe is called in, as water tank
Bottom.With pvc pipe special plastic glue, blocking cap glue is carried out in pvc pipe one, such a simple water tank.3rd step：
In order to which water filling is convenient, according to the sample of closestool water level controller, the hole of 2 centimetres of a diameter is bored in water tank bottom, has added one
Water level control lever apparatus.This water level control lever apparatus connects running water water inlet pipe, and water intaking is convenient, and water will not overflow and can control
Make certain water.4th step：The circular hole of 22 centimetres of diameters has been bored in water tank bottom, along with joint, has been pacified in a circular hole
Water pipe is taken on, outlet pipe is connected with heater, and installation return duct in another circular hole, recovery scale remover recycles.5th step：Dress
Upper filter.Screen pack self-made first filters bulky grain incrustation scale in the middle part of water tank.Then closeer filter is mounted in
Below the water inlet of water pump, fine particle is filtered.6th step：In order to prevent scale remover from overflowing, add a lid again in tank top
Son, also use blocking cap.7th step：Finally this water tank is fixed in the upper right corner of cabinet with two pipe clamps.
3rd, the installation of heater：
Add a Temperature controlled heater on water tank side.The high 37CM of the heater, wide 24CM, thick 10CM.Heater water inlet
It is connected in water outlet of water tank, the water in such water tank flows into water heater and heated naturally.It is fixed on inside chassis frame
Location right, below water tank, it is easy to connect.
4th, the installation of water pump：
Water pump size wants dot, is easy to combine with other assemblies, machine does not need excessive power water pump originally.Choose highest
Flow 16L/min, highest lift 12M, metered flow 6L/min.Rated head 6M.Rated voltage 220V, rated power 100W's
Water pump.The long 17CM of water pump, diameter 7CM.The position of water pump is arranged on the heater left part of water tank bottom, is easy to absorb water.This water
Pump water inlet mouth is connected with the delivery port of heater.The water heater that scale remover rinses family expenses can be thus mixed with hot water.
5th, water pipe connects：
A water circulation connection equipment is made with 4 threeways, the water outlet of water pump and needs to clean the family expenses of incrustation scale with flexible pipe
The water inlet of water heater is connected.Hot water with scale remover can thus flow into pot-type boiler, to water heater
Incrustation scale carries out washing away removing.The delivery port of the pot-type boiler of cleaned incrustation scale is connected with water tank with a pipe again, so
Water can be just set constantly to flow into water heater, then continuous reflow tank.Water circulation is used, plays using water wisely effect.
Add one in the connection of this water circulation：The converter valve of current direction, such water can intake from pot-type boiler water inlet, from delivery port
Water outlet.It can also be intake from delivery port, from water inlet water outlet.Reach comprehensive to water heater interior flushing.Preferably make incrustation scale
Flow out water heater.
Present invention test service condition：
According to incrustation scale descaling machine application method：Cold water pipe, hot-water line are correspondingly connected to flexible pipe water heater cold water pipe,
On hot-water line.Water inlet pipe is connected on running water pipe with flexible pipe, according to water heater volume number appropriate cleaning mixture or scale remover
Water tank is added, opens running water valve, water is constantly flowed into water tank.Water is flowed into temperature control heating device and heated, then flows into water pump.Beat
Boiling water switch pump, water pump start working, when the T-way water valve on 2 water heaters simultaneously open when, mixed with scale remover water from
Pot-type boiler water inlet is intake, from delivery port reflow tank.When converter valve commutates, mixed with scale remover water just from Household hot
Hydrophone delivery port is intake, from water inlet reflow tank.Rinse a period of time, so constantly circulation, the incrustation scale in water heater is continuous
Decompose, incrustation scale is constantly by water band recovery tank.Water becomes bronzing in water tank slowly.Scale removal terminates, and closes temperature control and adds
Hot device, opens water discharging valve, and scale particles thing discharges scaler with sewage.Water in water heater discharges also by scaler.
Scale removal terminates, closing machine, removes water pipe, completes a scale removal.
The present invention should be noted that as follows when making：
1st, the pipe of external water heater is longer during the water circulation system of design.So facilitate spotter and water heater
Be connected.
2nd, the rotating speed energy adjusting size of water pump.
3rd, converter valve is changed to Electronic Control converter valve, plays automatic exchange water (flow) direction.
4th, water tank, flexible pipe, water pump, joint all must be acid proof materials.
Advantages of the present invention is as follows：
1st, it is water heater scale removal, saves one of cumbersome process of dismounting water heater, reduces workload.
2nd, water and scale remover is all circulation Reusability, using water wisely, saves scale remover, reduces the row of sewage
Put.
3rd, Machine automated is water heater scale removal, and human contact's scale remover chance is few, reduces injury of the acid to human body.
4th, Electronic Control converter valve is changed the direction of a stream of water, and can be advantageous to from delivery port blowdown and can from water inlet blowdown
Scale particles thing is discharged, blowdown is more thoroughly.
5th, Temperature controlled heater thermal-stable water temperature, beneficial to scale remover scale removal in suitable water temperature.Improve scale removal efficiency.
6th, cleaning-machine structure is compact, is easily carried, and is brought convenience for family's place use, effect is fine.
Claims (3)
1. a kind of high-efficiency washing hot water apparatus, including cabinet (17), it is characterised in that in the cabinet (17), upper right quarter is fixed
Water tank (2), cabinet (17) right lower quadrant installation electric heater with thermostat (5), cabinet (17) middle and lower part installation water pump (6), cabinet (17)
External cold water pipe (9) and external hot-water line (10), cabinet (17) are fixed in upper left quarter installation converter valve (8), the left top of cabinet (17)
Right edge fixes drainpipe (14).
2. a kind of high-efficiency washing hot water apparatus according to claim 1, its feature fixes at the top of the water tank (2)
Water pipe (1), water tank (2) middle part are built-in with screen pack (3), and screen pack (3) is equipped with sewage (11) and incrustation scale (13), screen pack below
(3) filter water (12) is equipped with above, water tank (2) bottom right is equipped with drainpipe (14), and drainpipe is equipped with draining valve on (14)
(4), water tank (2) bottom left is equipped with return duct (7), and water tank (2) bottom is equipped with outlet pipe (18), the installation of outlet pipe (18) top
In screen pack (3) above.
3. a kind of high-efficiency washing hot water apparatus according to claim 1, its feature is on the electric heater with thermostat (5)
End is connected to the bottom of outlet pipe (18), and electric heater with thermostat (5) lower end is connected to connecting tube (15) one end, and connecting tube (15) is another
One end is connected to water pump (6) water inlet end, water pump (6) water side connection forcing pipe (16) one end, the connection of forcing pipe (16) other end
To one end under converter valve (8), the other end is connected to return duct (7) one end under converter valve (8), and return duct (7) other end is connected to
Water tank (2) bottom left, one end is connected to external cold water pipe (9) in converter valve (8), and the other end is connected to outer in converter valve (8)
Connect hot-water line (10).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720702386.XU CN206831811U (en) | 2017-06-10 | 2017-06-10 | A kind of high-efficiency washing hot water apparatus |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720702386.XU CN206831811U (en) | 2017-06-10 | 2017-06-10 | A kind of high-efficiency washing hot water apparatus |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN206831811U true CN206831811U (en) | 2018-01-02 |
Family
ID=60775888
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201720702386.XU Expired - Fee Related CN206831811U (en) | 2017-06-10 | 2017-06-10 | A kind of high-efficiency washing hot water apparatus |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN206831811U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113185050A (en) * | 2021-06-10 | 2021-07-30 | 华中科技大学 | Descaling and purifying device for water boiler |
| CN113513839A (en) * | 2021-07-22 | 2021-10-19 | 中国中医科学院中医基础理论研究所 | Novel constant-temperature sterilization instrument for medicated bath |
-
2017
- 2017-06-10 CN CN201720702386.XU patent/CN206831811U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113185050A (en) * | 2021-06-10 | 2021-07-30 | 华中科技大学 | Descaling and purifying device for water boiler |
| CN113185050B (en) * | 2021-06-10 | 2024-04-19 | 华中科技大学 | Descaling and purifying device for water boiler |
| CN113513839A (en) * | 2021-07-22 | 2021-10-19 | 中国中医科学院中医基础理论研究所 | Novel constant-temperature sterilization instrument for medicated bath |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| TR01 | Transfer of patent right | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20190423 Address after: 215300 Room 268 Dengyun Road, Kunshan City, Jiangsu Province Patentee after: Kunshan state automation equipment Co., Ltd. Address before: Room 304, Building 43, 88 Xueshi Road, Zhangpu Town, Kunshan City, Jiangsu Province Patentee before: Tang Yanshuang |
|
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20180102 Termination date: 20210610 |