CN213824211U - Ceramic membrane filter hot water belt cleaning device - Google Patents
Ceramic membrane filter hot water belt cleaning device Download PDFInfo
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- CN213824211U CN213824211U CN202022446564.1U CN202022446564U CN213824211U CN 213824211 U CN213824211 U CN 213824211U CN 202022446564 U CN202022446564 U CN 202022446564U CN 213824211 U CN213824211 U CN 213824211U
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Abstract
The application provides a ceramic membrane filter hot water belt cleaning device belongs to water, waste water or sewage treatment technical field. The device comprises a ceramic membrane filter, a water inlet pipe, a clean water tank and a heat preservation water tank, wherein the water inlet pipe is arranged on the water inlet pipe, the water inlet pipe is connected with the ceramic membrane filter and used for supplying raw water to be treated, a water outlet pipe is connected between the clean water tank and an outlet of the ceramic membrane filter, a water outlet valve is arranged on the water outlet pipe, the heat preservation water tank is heated by an electric heater, a heat cleaning pipe is connected between the bottom of the ceramic membrane filter and the heat preservation water tank, and a hot water valve, a cleaning pump and a cleaning valve are arranged on the heat cleaning pipe; a cold cleaning pipe is connected between the top of the ceramic membrane filter and the clean water tank, and a cold water valve and a circulating valve are arranged on the cold cleaning pipe; the hot cleaning pipe and the cold cleaning pipe are crossed and the on-off of the hot cleaning pipe and the cold cleaning pipe is controlled through valves, the device can realize hot water washing of the ceramic membrane in the filter, chemical agents are not needed, and the washing effect is good.
Description
Technical Field
The application relates to a ceramic membrane filter hot water cleaning device, which belongs to the technical field of water, waste water or sewage treatment.
Background
The ceramic membrane has the advantages of high temperature resistance, good chemical stability, high strength and the like, and is widely applied to the fields of water treatment, chemical industry, food, medicine, environmental protection and the like. However, ceramic membranes suffer from membrane fouling during operation, which is a bottleneck factor affecting their use.
Contamination of the ceramic membrane directly causes attenuation of membrane flux, resulting in increased operating costs of the ceramic membrane system and affecting the membrane's service life. Membrane cleaning is often required to ensure proper operation of the membrane system and to extend the life of the membrane.
The ceramic membrane cleaning comprises physical cleaning, chemical cleaning and the like. The physical cleaning technology mainly comprises flushing, back flushing, low-pressure high-flow-rate cleaning, negative-pressure cleaning, mechanical scraping and the like; chemical cleaning requires the use of acids, bases, etc. as cleaning fluids, increasing operating costs and system complexity.
SUMMERY OF THE UTILITY MODEL
In view of this, the application provides a ceramic membrane filter hot water cleaning device, adopts hot water to carry out the washing of ceramic membrane, does not need chemical agent, and washing effect is good.
Specifically, the method is realized through the following scheme:
the utility model provides a ceramic membrane filter hot water belt cleaning device, includes ceramic membrane filter, inlet tube, clean water basin, sets up the water intaking valve on the inlet tube, and the inlet tube is connected with the ceramic membrane filter for supply pending raw water, be connected with the outlet pipe between clean water basin and the ceramic membrane filter export, set up outlet valve, its characterized in that on the outlet pipe: the ceramic membrane filter is characterized by also comprising a heat preservation water tank, wherein the heat preservation water tank is heated by an electric heater, a heat cleaning pipe is connected between the bottom of the ceramic membrane filter and the heat preservation water tank, and a hot water valve, a cleaning pump and a cleaning valve are arranged on the heat cleaning pipe; a cold cleaning pipe is connected between the top of the ceramic membrane filter and the clean water tank, and a cold water valve and a circulating valve are arranged on the cold cleaning pipe; the hot cleaning pipe and the cold cleaning pipe are crossed and the on-off of the hot cleaning pipe and the cold cleaning pipe is controlled by each valve.
In the above scheme, five operation modes of normal filtration, cold water flushing, cold water circulating flushing, hot water flushing and hot water circulating flushing can be realized:
(1) and (4) normal filtration: and opening the water inlet valve and the water outlet valve, closing other valves, allowing raw water to enter the ceramic membrane filter through the water inlet pipe and the water inlet valve, filtering by the ceramic membrane filter, and allowing purified water to enter a clean water tank through an outlet of the ceramic membrane filter, a water outlet pipe and the water outlet valve to finish filtering.
(2) And (3) cold water flushing: closing the water inlet valve and the water outlet valve, opening the cleaning valve, the cold water valve and the drain valve, starting the cleaning pump, outputting the clean water of the clean water tank through the cold cleaning pipe and the cold water valve, sucking the clean water into the hot cleaning pipe by the cleaning pump (at the moment, the hot water valve is closed, and the hot cleaning pipe is communicated with the intersection of the cold cleaning pipe and the hot cleaning pipe), entering the bottom of the ceramic membrane filter through the cleaning valve, completing the washing from bottom to top, and discharging the clean water through the drain pipe and the drain valve at the top of the ceramic membrane filter to complete the cold water washing.
(3) And (3) cold water circulation flushing: closing the water inlet valve, the water outlet valve and the water discharge valve, opening the cleaning valve, the cold water valve, the water discharge valve and the circulating valve, starting the cleaning pump, outputting clean water in the clean water tank through the cold cleaning pipe and the cold water valve, sucking the clean water into the hot cleaning pipe by the cleaning pump (at the moment, the hot water valve is in a closed state, and the hot cleaning pipe is communicated with the intersection of the cold cleaning pipe), entering the bottom of the ceramic membrane filter through the cleaning valve, completing flushing from bottom to top, and then entering the ceramic membrane filter through the circulating valve (at the moment, the cold water valve can be closed in a matching manner as required), the cleaning pump and the cleaning valve to perform cold water circulating flushing.
(4) And (3) hot water flushing: and closing the water inlet valve and the water outlet valve, opening the cleaning valve, the hot water valve and the drain valve, starting the cleaning pump, enabling hot water in the heat-preservation water tank to enter the bottom of the ceramic membrane filter through the hot cleaning pipe, the hot water valve, the cleaning pump and the cleaning valve, and after washing from bottom to top, discharging the hot water through the drain pipe and the drain valve at the top of the ceramic membrane to finish hot water washing.
(5) Hot water circulation flushing: closing the water inlet valve, the water outlet valve and the drain valve, opening the cleaning valve, the hot water valve, the drain valve and the circulating valve, starting the cleaning pump, enabling hot water in the heat-preservation water tank to enter the bottom of the ceramic membrane filter through the hot cleaning pipe, the hot water valve, the cleaning pump and the cleaning valve, washing from bottom to top, enabling the hot water to enter the ceramic membrane filter through the circulating valve (at the moment, the cold water valve is in a closed state, and the intersection of the hot cleaning pipe and the cold cleaning pipe is communicated), the cleaning pump and the cleaning valve, and finishing hot water circulation washing.
Further, as preferable:
the washing device is characterized by further comprising a backwashing pipe, one end of the backwashing pipe is communicated with the hot cleaning pipe between the cleaning valve and the cleaning pump, the other end of the backwashing pipe is communicated with a water outlet pipe between the water outlet valve and the outlet of the ceramic membrane filter, and the backwashing pipe is provided with a backwashing valve. The sixth function can be realized at this time, namely backwashing: and closing the water inlet valve and the water outlet valve, opening the backwashing valve, the cold water valve and the drain valve, starting the cleaning pump, flushing clean water in the clean water tank into the ceramic membrane filter in a reverse direction through the cold cleaning pipe and the cold water valve (which are transferred into the hot cleaning pipe) and through the cleaning pump, the backwashing valve and the outlet of the ceramic membrane filter, and discharging the clean water through the drain valve on the drain pipe after the backwashing is finished, so that the backwashing of the ceramic membrane filter is finished.
And a water injection pipe is arranged between the heat preservation water tank and the clean water tank, and a water injection valve is arranged on the water injection pipe. The water in the heat-preservation water tank can be lost after being cleaned, and the clean water in the clean water tank can be directly supplied to the heat-preservation water tank by means of a water injection pipe and a water injection valve for convenient water supplement. More preferably, the heat preservation water tank is composed of an inner container, a heat preservation layer and a shell from inside to outside.
The electric heater is a resistance heater. More preferably, the electric heater adopts a single-phase 220V alternating current power supply or a three-phase 380V alternating current power supply. Both different power supplies are adaptable.
In the above scheme, the heat-preservation water tank is further provided with a heat pump heating system, the heat pump heating system comprises a closed pipeline, an axial flow fan, a condenser, a compressor, an evaporator, an expansion valve and a filter, the condenser is arranged on the closed pipeline, the condenser is located in the heat-preservation water tank, and the evaporator and the axial flow fan are correspondingly arranged. The water is heated by utilizing the temperature reduction of the internal medium of the condenser and the temperature rise of the external medium of the condenser.
In the above scheme, the heat preservation water tank is further provided with a solar heating system, two ends of a solar heating pipeline of the solar heating system are respectively connected into the heat preservation water tank, and a solar heat collector and a circulating pump are arranged on the solar heating pipeline. More preferably, the solar heat collector is provided with a plurality of heat collecting pipes, and each heat collecting pipe comprises an outer pipe and an inner pipe plated with a selective adsorption coating. The heat collecting pipe is a glass pipe.
The heat pump heating system and the solar heating system can be arranged independently or simultaneously.
Drawings
FIG. 1 is a schematic diagram of one of the structures of the present application;
fig. 2 is another schematic structural diagram of the present application.
Reference numbers in the figures: 1. a ceramic membrane filter; 11. a cold water valve; 12. cleaning the pump; 13. a backwash valve; 14. cleaning the valve; 15. a circulation valve; 16. cold washing the tube; 2. a water inlet pipe; 21. a water inlet valve; 3. a drain pipe; 31. a drain valve; 4. a water outlet pipe; 41. a water outlet valve; 5. a clean water tank; 6. a water injection pipe; 61. a water injection pump; 7. a heat preservation water tank; 71. a hot water valve; 72. an electric heater; 73. thermally cleaning the tube; 8. closing the pipeline; 81. a condenser; 82. a compressor; 83. an evaporator; 84. an expansion valve; 85. a filter; 86. an axial flow fan; 9. a solar heating pipeline; 91. a solar heat collector; 911. a heat collecting pipe; 92. and a circulating pump.
Detailed Description
A ceramic membrane filter hot water cleaning device is disclosed, and is combined with a figure 1, and comprises a ceramic membrane filter 1, a water inlet pipe 2, a clean water tank 5 and a heat preservation water tank 7, wherein the water inlet pipe 2 is provided with a water inlet valve 21, the water inlet pipe 2 is connected with the ceramic membrane filter 1 and is used for supplying raw water to be treated, a water outlet pipe 4 is connected between the clean water tank 5 and an outlet of the ceramic membrane filter 1, the water outlet pipe 4 is provided with a water outlet valve 41, the heat preservation water tank 7 is heated by an electric heater 72, a heat cleaning pipe 73 is connected between the bottom of the ceramic membrane filter 1 and the heat preservation water tank 7, and the heat cleaning pipe 73 is provided with a hot water valve 72, a cleaning pump 12 and a cleaning valve 13; a cold cleaning pipe 16 is connected between the top of the ceramic membrane filter 1 and the clean water tank 5, and a cold water valve 11 and a circulating valve 15 are arranged on the cold cleaning pipe 16; the hot cleaning pipe 73 is crossed with the cold cleaning pipe 16 and is controlled to be switched on and off through valves.
In the above scheme, through control pump, valve, can realize that normal filtration, cold water wash, cold water circulation wash, hot water wash and hot water circulation wash five kinds of operational modes:
(1) and (4) normal filtration: and opening the water inlet valve 21 and the water outlet valve 41, closing other valves, allowing raw water to enter the ceramic membrane filter 1 through the water inlet pipe 2 and the water inlet valve 21, filtering by the ceramic membrane filter 1, and allowing purified water to enter the clean water tank 5 through the outlet of the ceramic membrane filter 1, the water outlet pipe 4 and the water outlet valve 41 to complete filtration.
(2) And (3) cold water flushing: closing the water inlet valve 21 and the water outlet valve 41, opening the cleaning valve 14, the cold water valve 11 and the water discharge valve 31, starting the cleaning pump 12, outputting the clean water in the clean water tank 5 through the cold cleaning pipe 16 and the cold water valve 11, sucking the hot cleaning pipe 73 by the cleaning pump 12 (at the moment, the hot water valve 71 is closed, and the hot cleaning pipe 73 is communicated with the intersection of the cold cleaning pipe 16), pumping the clean water into the bottom of the ceramic membrane filter 1 through the cleaning pump 12 and the cleaning valve 14, completing the washing from bottom to top, discharging the clean water through the water discharge pipe 3 and the water discharge valve 31 at the top of the ceramic membrane filter 1, and completing the cold water washing.
(3) And (3) cold water circulation flushing: closing the water inlet valve 21, the water outlet valve 41 and the water outlet valve 31, opening the cleaning valve 14, the cold water valve 11, the water outlet valve 31 and the circulating valve 15, starting the cleaning pump 12, outputting the clean water in the clean water tank 5 through the cold cleaning pipe 16 and the cold water valve 11, sucking the hot cleaning pipe 73 by the cleaning pump 12 (at this time, the hot water valve 71 is closed, and the hot cleaning pipe 73 is communicated with the intersection of the cold cleaning pipe 16), pumping the clean water into the bottom of the ceramic membrane filter 1 through the cleaning pump 12 and the cleaning valve 14, completing the washing from bottom to top, and then entering the ceramic membrane filter 1 through the circulating valve 15 (at this time, the cold water valve 11 can be closed in a matching manner as required), the cleaning pump 12 and the cleaning valve 14 to perform cold water circulating washing.
(4) And (3) hot water flushing: closing the water inlet valve 21 and the water outlet valve 41, opening the cleaning valve 14, the hot water valve 71 and the water discharge valve 31, starting the cleaning pump 12, enabling hot water in the heat preservation water tank 7 to enter the bottom of the ceramic membrane filter 1 through the hot cleaning pipe 73, the hot water valve 71, the cleaning pump 12 and the cleaning valve 14, flushing from bottom to top, and discharging through the water discharge pipe 3 and the water discharge valve 31 at the top of the ceramic membrane filter 1 to finish hot water flushing.
(5) Hot water circulation flushing: closing the water inlet valve 21, the water outlet valve 41 and the water discharge valve 31, opening the cleaning valve 14, the hot water valve 71, the water discharge valve 31 and the circulating valve 15, starting the cleaning pump 12, enabling hot water in the heat preservation water tank 7 to enter the bottom of the ceramic membrane filter 1 through the hot cleaning pipe 73, the hot water valve 71, the cleaning pump 12 and the cleaning valve 14, flushing from bottom to top, then enabling the hot water to enter the ceramic membrane filter 1 through the circulating valve 15 (at the moment, the cold water valve 11 is in a closed state, the hot cleaning pipe 73 is communicated with the intersection of the cold cleaning pipe 16), the cleaning pump 12 and the cleaning valve 14, and completing hot water circulation flushing.
As an alternative, referring to fig. 1, a backwashing pipe is further included, one end of the backwashing pipe is communicated with the hot cleaning pipe 73 between the cleaning valve 14 and the cleaning pump 12, the other end of the backwashing pipe is communicated with the water outlet pipe 4 between the water outlet valve 41 and the outlet of the ceramic membrane filter 1, and the backwashing pipe is provided with a backwashing valve 13. The sixth function can be realized at this time, namely backwashing: closing the water inlet valve 21 and the water outlet valve 41, opening the backwashing valve 13, the cold water valve 11 and the drain valve 31, starting the cleaning pump 12, flushing clean water in the clean water tank 5 into the ceramic membrane filter 1 in a reverse direction through the cold cleaning pipe 16 and the cold water valve 11 (turning into the hot cleaning pipe 73), passing through the cleaning pump 12, the backwashing valve 13 and the outlet of the ceramic membrane filter 1, and discharging the clean water through the drain valve 31 on the drain pipe 3 after the backwashing is finished, thus finishing the backwashing of the ceramic membrane filter 1.
As an alternative, a water injection pipe 6 is arranged between the heat preservation water tank 7 and the clean water tank 5, and a water injection valve 60 is arranged on the water injection pipe 6. The water in the heat preservation water tank 7 can be washed and then lost, and in order to facilitate water supplement, the clean water in the clean water tank 5 can be directly supplied to the heat preservation water tank 7 by means of the water injection pipe 6 and the water injection valve 61. Preferably, the heat preservation water tank 7 is composed of an inner container, a heat preservation layer and a shell from inside to outside.
As an alternative, the electric heater 72 is a resistive heater. Preferably, the electric heater 72 is a single-phase 220V ac power supply, or three-phase 380V ac power supplies may be used by a combination of three Y connections. Both different power supplies are adaptable.
In the above scheme, with reference to fig. 2, the heat-preservation water tank 7 is further provided with a heat pump heating system, the heat pump heating system includes a closed pipeline 8, an axial flow fan 86, a condenser 81, a compressor 82, an evaporator 83, an expansion valve 84, and a filter 85 which are arranged on the closed pipeline 8, the condenser 81 is located in the heat-preservation water tank 7, the evaporator 83 is arranged corresponding to the axial flow fan 86, the condenser 81, the compressor 82, the evaporator 83, the expansion valve 84, the filter 85, and the axial flow fan 86 constitute the heat pump heating system, the axial flow fan 86 increases the air flow near the evaporator 83, outdoor air is subjected to heat exchange by the evaporator 83, a working medium inside the evaporator 83 absorbs air heat to raise the temperature, the working medium absorbs heat to vaporize and is sucked into the compressor 82, the compressor 82 compresses the low-pressure working medium gas into high-temperature high-pressure gas and sends the high-pressure gas into the condenser 81, and water around the condenser 81 is heated, the working medium is cooled to liquid, and the liquid is throttled and cooled by the expansion valve 84 and then flows into the evaporator 83 again, so that the circulation work is repeated.
In the above scheme, with reference to fig. 2, the heat-insulating water tank 7 is further provided with a solar heating system, two ends of a solar heating pipeline 9 of the solar heating system are respectively connected to the heat-insulating water tank 7, and the solar heating pipeline 9 is provided with a solar heat collector 91 and a circulating pump 92. Preferably:
the solar heat collector 91 is provided with a plurality of heat collecting tubes 911, wherein the heat collecting tubes 911 are solar vacuum heat collecting tubes of all-glass structures and are divided into outer tubes and inner tubes, and the outer walls of the inner tubes are plated with selective absorption coatings.
The circulation pump 92 circulates water for heating by the solar heating system.
The heat pump heating system and the solar heating system can be arranged independently, or the heat pump heating system and the solar heating system can be arranged simultaneously as shown in fig. 2, and at the moment, the heat-preservation water tank 7 is configured with three heating modes of electric heating, solar heating and heat pump type heating.
In this embodiment, the water in the hot water tank may be heated by an electric heater, a heat pump heater, a solar heat collector, or the like. The solar heating does not need electric energy, is environment-friendly and economical, but is influenced by weather; the resistance heater directly converts electric energy into heat energy, so that the energy consumption is high, but the equipment is simple; the heat pump type heater absorbs heat in air, so that the energy efficiency is high and can reach 3-4, the energy-saving effect is obvious, but the effect is poor at low temperature.
In this case, the heat-insulating water tank 7 is equipped with sensors for detecting water temperature and water level, ambient temperature and ambient light, and controls the working states of the three heating modes according to the detection data and the cleaning requirements, so as to optimize energy utilization: in the case that solar energy is available, the circulating pump 92 is started, and the solar heating system is used for heating; when the solar heating water temperature does not meet the requirement, starting a heat pump heating system; when the ambient temperature is too low/too high, the efficiency of the heat pump system is very low or the water temperature reaches the upper limit of the heat pump heating system, the electric heater is started to heat, so that the advantages of the three heating modes are fully utilized, and the respective defects are avoided.
The hot water cleaning device of the embodiment can improve the physical cleaning effect of the ceramic membrane filter, and the combination of various water heating modes can avoid the reliability of the system when the environmental conditions change, thereby achieving the purposes of energy conservation, environmental protection and reliable operation of the system.
Claims (10)
1. The utility model provides a ceramic membrane filter hot water belt cleaning device, includes ceramic membrane filter, inlet tube, clean water basin, sets up the water intaking valve on the inlet tube, and the inlet tube is connected with the ceramic membrane filter for supply pending raw water, be connected with the outlet pipe between clean water basin and the ceramic membrane filter export, set up outlet valve, its characterized in that on the outlet pipe: the ceramic membrane filter is characterized by also comprising a heat preservation water tank, wherein the heat preservation water tank is heated by an electric heater, a heat cleaning pipe is connected between the bottom of the ceramic membrane filter and the heat preservation water tank, and a hot water valve, a cleaning pump and a cleaning valve are arranged on the heat cleaning pipe; a cold cleaning pipe is connected between the top of the ceramic membrane filter and the clean water tank, and a cold water valve and a circulating valve are arranged on the cold cleaning pipe; the hot cleaning pipe and the cold cleaning pipe are crossed and the on-off of the hot cleaning pipe and the cold cleaning pipe is controlled by each valve.
2. A ceramic membrane filter hot water cleaning apparatus as claimed in claim 1, wherein: and a water injection pipe is arranged between the heat preservation water tank and the clean water tank, and a water injection valve is arranged on the water injection pipe.
3. A ceramic membrane filter hot water cleaning apparatus as claimed in claim 1, wherein: the heat-preservation water tank consists of an inner container, a heat-preservation layer and a shell from inside to outside.
4. A ceramic membrane filter hot water cleaning apparatus as claimed in claim 1, wherein: the electric heater is a resistance heater.
5. A ceramic membrane filter hot water cleaning apparatus as claimed in claim 1, wherein: the electric heater adopts a single-phase 220V alternating current power supply or a three-phase 380V alternating current power supply.
6. A ceramic membrane filter hot water cleaning apparatus as claimed in claim 1, wherein: the washing device is characterized by further comprising a backwashing pipe, one end of the backwashing pipe is communicated with the hot cleaning pipe between the cleaning valve and the cleaning pump, the other end of the backwashing pipe is communicated with a water outlet pipe between the water outlet valve and the outlet of the ceramic membrane filter, and the backwashing pipe is provided with a backwashing valve.
7. A ceramic membrane filter hot water cleaning device according to any one of claims 1 to 6, wherein: the heat-preservation water tank is also provided with a heat pump heating system, the heat pump heating system comprises a closed pipeline, an axial flow fan, a condenser, a compressor, an evaporator, an expansion valve and a filter, the condenser, the compressor, the evaporator, the expansion valve and the filter are arranged on the closed pipeline, the condenser is located in the heat-preservation water tank, and the evaporator and the axial flow fan are correspondingly arranged.
8. A ceramic membrane filter hot water cleaning device according to any one of claims 1 to 6, wherein: the solar water heater is characterized in that the heat preservation water tank is also provided with a solar heating pipe, two ends of the solar heating pipeline are respectively connected into the heat preservation water tank, and a solar heat collector and a circulating pump are arranged on the solar heating pipeline.
9. A ceramic membrane filter hot water cleaning apparatus according to claim 8, wherein: the solar heat collector is provided with a plurality of heat collecting pipes, and each heat collecting pipe comprises an outer pipe and an inner pipe plated with a selective adsorption coating.
10. A ceramic membrane filter hot water cleaning apparatus according to claim 9, wherein: the heat collecting pipe is a glass pipe.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022446564.1U CN213824211U (en) | 2020-10-29 | 2020-10-29 | Ceramic membrane filter hot water belt cleaning device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022446564.1U CN213824211U (en) | 2020-10-29 | 2020-10-29 | Ceramic membrane filter hot water belt cleaning device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN213824211U true CN213824211U (en) | 2021-07-30 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202022446564.1U Active CN213824211U (en) | 2020-10-29 | 2020-10-29 | Ceramic membrane filter hot water belt cleaning device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN213824211U (en) |
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2020
- 2020-10-29 CN CN202022446564.1U patent/CN213824211U/en active Active
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Effective date of registration: 20210907 Address after: 312000 Zhangzhen industrial functional zone, Shangyu District, Shaoxing City, Zhejiang Province Patentee after: ZHEJIANG TIANXINGJIAN WATER Co.,Ltd. Address before: 310016 218, 2nd floor, building 7, 41 Caihe Road, Jianggan District, Hangzhou City, Zhejiang Province Patentee before: TJIAN WATER GROUP (HANGZHOU) Co.,Ltd. |