CN210601824U - Waste heat recovery system of range hood - Google Patents
Waste heat recovery system of range hood Download PDFInfo
- Publication number
- CN210601824U CN210601824U CN201921746112.6U CN201921746112U CN210601824U CN 210601824 U CN210601824 U CN 210601824U CN 201921746112 U CN201921746112 U CN 201921746112U CN 210601824 U CN210601824 U CN 210601824U
- Authority
- CN
- China
- Prior art keywords
- waste heat
- heat recovery
- water
- flue gas
- range hood
- 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.)
- Active
Links
- 239000002918 waste heat Substances 0.000 title claims abstract description 85
- 238000011084 recovery Methods 0.000 title claims abstract description 82
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 175
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 claims abstract description 65
- 239000003546 flue gas Substances 0.000 claims abstract description 65
- 239000006096 absorbing agent Substances 0.000 claims abstract description 19
- 239000006233 lamp black Substances 0.000 claims abstract description 19
- 239000000779 smoke Substances 0.000 claims description 20
- 238000000746 purification Methods 0.000 claims description 6
- 239000007788 liquid Substances 0.000 claims description 5
- 239000007921 spray Substances 0.000 claims 2
- 238000005265 energy consumption Methods 0.000 description 7
- 238000010586 diagram Methods 0.000 description 5
- 239000003517 fume Substances 0.000 description 4
- 239000007789 gas Substances 0.000 description 4
- 230000009471 action Effects 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 238000010521 absorption reaction Methods 0.000 description 2
- 230000008676 import Effects 0.000 description 2
- 238000005507 spraying Methods 0.000 description 2
- 239000012459 cleaning agent Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000004134 energy conservation Methods 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000004321 preservation Methods 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 230000004044 response Effects 0.000 description 1
- 230000001932 seasonal effect Effects 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 230000007704 transition Effects 0.000 description 1
Images
Landscapes
- Heat-Pump Type And Storage Water Heaters (AREA)
Abstract
The utility model discloses a lampblack absorber waste heat recovery system, the system includes control platform, heat pump set, storage water tank, set up the heat exchanger in the lampblack absorber and set up the flue gas waste heat recovery device in the lampblack absorber flue, heat pump set respectively through first heat transfer return circuit and second heat transfer return circuit with flue gas waste heat recovery device with the storage water tank is linked together, the storage water tank respectively through first circulation water route and second circulation water route with the heat exchanger with looks flue gas waste heat recovery device intercommunication, control platform is used for control first circulation water route the second circulation water route first heat transfer return circuit with opening and closing of heat pump set. Adopt the technical scheme of the utility model, control mode is simple and heat recovery efficiency is high.
Description
Technical Field
The utility model relates to a flue gas waste heat recovery field especially relates to a lampblack absorber waste heat recovery system.
Background
The flue gas waste heat recovery technology can recover the waste heat in the process flue gas, so that the purposes of energy conservation and emission reduction are achieved, and therefore, the flue gas waste heat recovery technology is widely applied to the industry.
However, for a household range hood, a large amount of residual heat of smoke exists in smoke in the range hood and is not utilized. If the flue gas waste heat recovery technology in the industry is applied to a household range hood for heat recovery, the problems of complex system control and low heat recovery efficiency can be caused.
SUMMERY OF THE UTILITY MODEL
The utility model aims at the technical problem that the flue gas waste heat recovery device system control is complicated and heat recovery efficiency is low to above-mentioned prior art, provide a simple and high lampblack absorber waste heat recovery system of heat recovery efficiency of control mode.
The embodiment of the utility model provides an in, a lampblack absorber waste heat recovery system is provided, it includes control platform, heat pump set, storage water tank, set up the heat exchanger in the lampblack absorber and set up the flue gas waste heat recovery device in the lampblack absorber flue, heat pump set respectively through first heat transfer return circuit and second heat transfer return circuit with flue gas waste heat recovery device with the storage water tank is linked together, the storage water tank respectively through first circulation water route and second circulation water route with the heat exchanger with looks flue gas waste heat recovery device intercommunication, control platform is used for control first circulation water route the second circulation water route first heat transfer return circuit with opening and closing of heat pump set.
In the embodiment of the utility model, first circulation water route includes first circulating water pump, filter, set up in the circulating water import of storage water tank with first electric valve between the heat exchanger with set up in the circulating water export of storage water tank with second electric valve between the heat exchanger.
In the embodiment of the utility model, the second circulation water route include second circulating water pump, set up in the circulating water import of storage water tank with third electric valve between the flue gas waste heat recovery device with set up in the circulating water export of storage water tank with fourth electric valve between the flue gas waste heat recovery device.
In the embodiment of the utility model, first heat transfer return circuit include third circulating water pump with set up respectively in heat pump set with fifth electric valve and sixth electric valve between two connecting tubes of flue gas waste heat recovery device.
In the embodiment of the utility model provides an in, in the second heat transfer return circuit, heat pump set respectively with the air inlet and the liquid outlet of storage water tank are connected.
In the embodiment of the utility model, lampblack absorber waste heat recovery system still include with the heat pump switch board that heat pump set is connected.
In the embodiment of the utility model provides an in, lampblack absorber waste heat recovery system still include with the condensate tank that flue gas waste heat recovery device is connected.
In the embodiment of the utility model provides an in, lampblack absorber waste heat recovery system still including set up in flue gas purification sprinkler in the lampblack absorber flue, flue gas purification sprinkler set up in the lampblack absorber with between the waste heat recovery device.
Compared with the prior art, in the range hood waste heat recovery system of the utility model, the heat pump unit is respectively communicated with the flue gas waste heat recovery device and the water storage tank through a first heat exchange loop and a second heat exchange loop, the water storage tank is respectively communicated with the heat exchanger and the phase flue gas waste heat recovery device through a first circulation water path and a second circulation water path, the control platform also divides the operation time period of the water heater into a power consumption peak time period and a water heater power consumption wave level time period according to the historical energy consumption statistical condition of the water heater when the range hood is opened, the control platform controls the opening and closing of the first circulation water path, the second circulation water path, the first heat exchange loop and the heat pump unit according to the current time period and the water temperature in the water tank, thereby forming different heat exchange systems to absorb the heat generated by the oil smoke in the range hood, the control mode is simple and effective, and the energy consumption can be reduced.
Drawings
Fig. 1 is a schematic structural diagram of an oil smoke waste heat recovery system according to an embodiment of the present invention.
Fig. 2 is a schematic diagram of the primary flue gas waste heat recovery system of the embodiment of the present invention.
Fig. 3 is the schematic diagram of the two-stage flue gas waste heat recovery system of the heat pump unit of the embodiment of the present invention.
Fig. 4 is the schematic diagram of the circulating water secondary flue gas waste heat recovery system of the embodiment of the utility model.
Fig. 5 is a schematic control flow diagram of the oil smoke waste heat recovery system according to the embodiment of the present invention.
Detailed Description
The embodiment of the utility model provides a lampblack absorber waste heat recovery system, it includes control platform (not shown), heat pump set 8, heat pump switch board 9, storage water tank 10, set up heat exchanger 3 in lampblack absorber 1, set up flue gas purification sprinkler 5, flue gas waste heat recovery device 6 in lampblack absorber flue 15 and with the condensate water tank 16 that heat transfer device 6 is connected. The flue gas waste heat recovery device 6 is used for recovering the heat of the flue gas in the flue. The heat pump unit 8 is respectively communicated with the flue gas waste heat recovery device 6 and the water storage tank 10 through a first heat exchange loop (not marked) and a second heat exchange loop (not marked) and is used for absorbing the flue gas waste heat recovered by the flue gas waste heat recovery device 6 to heat the water in the water storage tank 10. The heat pump control cabinet 9 is used for controlling the heat pump unit 8. The water storage tank 10 is a water tank of a water heater. The fume purification spraying device 5 is arranged between the range hood 1 and the waste heat recovery device 6 and used for spraying fume cleaning agent to purify the fume flue 15 of the range hood and the fume waste heat recovery device 6. The condensate water tank 16 is used for collecting water condensed from the flue gas and other harmful substances such as oil stains purified from the flue gas.
The heat pump unit 8 is respectively communicated with the flue gas waste heat recovery device 6 and the water storage tank 10 through a first heat exchange loop (not marked) and a second heat exchange loop (not marked). The control platform also divides the operation time period of the water heater into a power consumption wave crest time period and a water heater power consumption wave crest time period according to the historical energy consumption statistical condition of the water heater, and when the range hood is started, the control platform controls the first circulating water path, the second circulating water path, the first heat exchange loop and the heat pump unit 8 to be started and stopped according to the current time period and the water temperature of the water storage tank 10, so that different heat exchange systems are formed to absorb heat generated by oil smoke in the range hood.
As shown in fig. 2, the first circulating water path includes a first circulating water pump 71, a filter 4, a first electric valve 36 disposed between the circulating water inlet 13 of the storage water tank 10 and the heat exchanger 3, and a second electric valve 31 disposed between the circulating water outlet 14 of the storage water tank 10 and the heat exchanger 3. The first electric valve 36 and the second electric valve 31 are used for opening or closing the first circulating water path in response to the instruction of the control platform. The first circulation water pump 71 is used for supplying water circulation power to the circulation water path. The filter 4 is used for filtering the water flowing through the first circulating water path. The first circulating water path is further provided with a temperature sensor 21 and a temperature sensor 22, which are respectively used for detecting the temperature of the water flowing into the heat exchanger 3 and the temperature of the water flowing out of the heat exchanger 3.
When the first electric valve 36, the second electric valve 31 and the first circulating water pump 71 are opened, the heat exchanger 3, the first circulating water path and the water storage tank 10 form a primary flue gas waste heat recovery system. The cold water in the water storage tank 10 flows into the heat exchanger 3 through the circulating water outlet 14 under the action of the first circulating water pump 71 to exchange heat with the flue gas, and the preheated water directly flows into the water storage tank 10 through the circulating water inlet 13 via the filter 4.
As shown in fig. 3, the second circulating water path includes a second circulating water pump 74, a third electric valve 35 disposed between the circulating water inlet 13 of the water storage tank 10 and the flue gas waste heat recovery device 6, and a fourth electric valve 32 disposed between the circulating water outlet 14 of the water storage tank 10 and the flue gas waste heat recovery device. And a temperature sensor 24 and a temperature sensor 25 are further arranged in the second circulating water path and are respectively used for detecting the water temperature flowing into the flue gas waste heat recovery device 6 and the water temperature flowing out of the flue gas waste heat recovery device 6.
When the third electric valve 35, the fourth electric valve 32 and the second circulating water pump 74 are opened, the flue gas waste heat recovery device 6, the second circulating water path and the water storage tank 10 form a circulating water secondary flue gas waste heat recovery system. The water in the water tank flows out from the circulating water outlet 14, flows through the flue gas waste heat recovery device 6 under the action of the second circulating water pump 74, is circularly heated by the flue gas waste heat recovery device 6, and flows into the water storage tank 10 through the circulating water inlet 13 after being heated, and then the next circulation is started.
As shown in fig. 4, the first heat exchange loop includes a third circulating water pump 73, and a fifth electric valve 33 and a sixth electric valve 34 respectively disposed between the heat pump unit 8 and the two connecting pipes of the flue gas waste heat recovery device 6. In the second heat exchange loop, the heat pump unit 8 is respectively connected with the air inlet 11 and the liquid outlet 12 of the water storage tank 10.
When the heat pump unit 8 is started, the fifth electric valve 33, the sixth electric valve 34 and the third circulating water pump 73 are opened, the flue gas waste heat recovery device 6, the heat pump unit 8 and the water storage tank 10 form a heat pump unit secondary flue gas waste heat recovery system. After the flue gas passes through the primary waste heat recovery system, a large amount of unused low-quality heat energy still exists, the waste heat recovery device 6 can absorb the heat in the flue gas and then convey the heat to the heat pump unit 8, and the heat pump unit 8 absorbs the low-grade waste heat in the flue gas recovered by the flue gas waste heat recovery device 6 through the first heat absorption loop to generate high-grade heat, and supplies heat to the water storage tank 10 through the second heat exchange loop. The heat pump unit 8 is composed of an evaporator, a condenser, a variable frequency compressor and a throttling device. The heat pump unit 8 directly exchanges heat with cold water in the water tank through the air inlet 11, and a low-temperature and low-pressure gas-liquid mixture formed after heat exchange is discharged through the liquid outlet 12 and then flows into an evaporator of the heat pump unit 8 to continue to perform circulating work.
As shown in fig. 5, the operation flow of the oil smoke waste heat recovery system provided by the embodiment of the present invention is as follows:
when the range hood is started, the control platform opens the first electric valve 36 and the second electric valve 31, and starts the first circulating water pump 71, so that the first circulating water path is started. The low-temperature water in the water storage tank 10 starts to circulate under the action of the first water circulation pump 71, and heat exchange with high-temperature flue gas is realized in the range hood through the heat exchanger 3. The low-temperature circulating water flowing out from the circulating inlet 14 is preheated and then flows into the water storage tank 10 through the circulating inlet 13, and then the heat exchange circulation of the next stage is started.
When secondary waste heat recovery is carried out on the flue gas, the control platform collects and analyzes historical power consumption data of the water heater, and divides the power consumption time interval into a wave crest time interval and a wave level time interval, wherein the wave crest time interval is a time interval when a user frequently uses the water heater, and the wave level time interval is an idle time interval of the water heater.
If the current time interval is the power consumption peak time interval of the water heater, the requirement of the user on hot water is large, namely a large amount of hot water is discharged and cold water enters the water storage tank 10. At this time, the control platform starts the heat pump unit 8 and the first heat exchange loop (opens the fifth electric valve 33, the sixth electric valve 34 and the third circulating water pump 73), closes the second circulating water path (the third electric valve 35, the fourth electric valve 32 and the second circulating water pump 74), and divides the exhaust gas temperature into three sections of T1 (T2 > a ℃), T2 (a ℃ < T2< b ℃), and T3 (T2 < b ℃) (a > b) according to the exhaust gas temperature. When the exhaust smoke temperature is at the section T1, that is, the exhaust smoke temperature is higher than the set value range, it indicates that a large amount of residual heat in the exhaust smoke is not utilized, and through economic analysis, the heat pump control cabinet 9 reduces the operating frequency of the heat pump unit 8, so that the energy consumption of the heat pump unit 8 is reduced, and the heat pump unit 8 can still continue to operate; when the exhaust gas temperature is in the section T2, the operation frequency of the heat pump unit is kept unchanged; when the exhaust smoke temperature is in the section T3, that is, the exhaust smoke temperature is lower than the set value range, it indicates that only a small part of the unused waste heat is in the exhaust smoke, and in order to maintain the hot water supply, the heat pump control cabinet 9 increases the operating frequency of the heat pump unit 8, and improves the heat absorption capacity of the heat pump unit 8, thereby absorbing a small part of the waste heat in the exhaust smoke. In the above embodiment, the exhaust gas temperature is divided into three stages, i.e., T1 (T2 > a ℃), T2 (a ℃ < T2< b ℃), and T3 (T2 < b ℃) (a > b), so that a user can reasonably design a temperature range according to actual conditions or seasonal changes of the user, and an optimal energy-saving effect is achieved under the condition of meeting the demand for hot water.
If the current time interval is the time interval of the power consumption wave level of the water heater, the water heater is in a heat preservation transition state, namely hot water supply is not needed. If the current time interval is the power consumption wave level time interval of the water heater, the heat pump unit 8 and the first heat exchange loop are closed (the fifth electric valve 33, the sixth electric valve 34 and the third circulating water pump 73 are closed) so as to avoid unnecessary energy consumption brought by the heat pump unit 8 in the current stage and monitor the water temperature t1 of the water storage tank and the smoke exhaust temperature t2 in the smoke flue of the range hood in real time,
when t1< t2, it is indicated that the temperature of water in the water storage tank 10 is lower than the temperature of flue gas, which means that the circulating water can collect the waste heat in the flue gas through convective heat transfer, and the second circulating water path is opened to collect the waste heat in the flue gas;
when t1> t2, it indicates that the water temperature in the water storage tank 10 is higher than the flue gas temperature, which means that the second circulation water path cannot collect the waste heat in the flue gas through convection heat transfer, and therefore, the heat pump unit 8 and the first heat exchange loop are started to collect the part of heat.
In summary, in the range hood waste heat recovery system of the present invention, the heat pump unit is respectively communicated with the flue gas waste heat recovery device and the water storage tank through the first heat exchange loop and the second heat exchange loop, the water storage tank is respectively communicated with the heat exchanger and the phase flue gas waste heat recovery device through the first circulation water path and the second circulation water path, the control platform further divides the operation time of the water heater into the power consumption peak time and the power consumption wave level time according to the historical energy consumption statistics of the water heater, when the range hood is turned on, the control platform controls the turning on and off of the first circulation water path, the second circulation water path, the first heat exchange loop and the heat pump unit according to the current time and the water temperature in the water tank, so as to form different heat exchange systems to absorb the heat generated by the flue gas in the range hood, the control mode is simple and effective, and the energy consumption can be reduced.
The above description is only exemplary of the present invention and should not be taken as limiting the scope of the present invention, as any modifications, equivalents, improvements and the like made within the spirit and principles of the present invention are intended to be included within the scope of the present invention.
Claims (8)
1. The utility model provides a lampblack absorber waste heat recovery system, its characterized in that, includes control platform, heat pump set, storage water tank, set up the heat exchanger in the lampblack absorber and set up the flue gas waste heat recovery device in the lampblack absorber flue, heat pump set respectively through first heat transfer return circuit and second heat transfer return circuit with flue gas waste heat recovery device with the storage water tank is linked together, the storage water tank respectively through first circulation water route and second circulation water route with the heat exchanger with flue gas waste heat recovery device intercommunication, control platform is used for control first circulation water route the second circulation water route first heat transfer return circuit with opening and closing of heat pump set.
2. The range hood waste heat recovery system of claim 1, wherein the first circulating water path comprises a first circulating water pump, a filter, a first electric valve arranged between a circulating water inlet of the water storage tank and the heat exchanger, and a second electric valve arranged between a circulating water outlet of the water storage tank and the heat exchanger.
3. The range hood waste heat recovery system of claim 1, wherein the second circulating water path comprises a second circulating water pump, a third electric valve arranged between a circulating water inlet of the water storage tank and the smoke waste heat recovery device, and a fourth electric valve arranged between a circulating water outlet of the water storage tank and the smoke waste heat recovery device.
4. The range hood waste heat recovery system of claim 1, wherein the first heat exchange loop comprises a third circulating water pump and a fifth electric valve and a sixth electric valve which are respectively arranged between the heat pump unit and two connecting pipelines of the smoke waste heat recovery device.
5. The range hood waste heat recovery system of claim 1, wherein in the second heat exchange loop, the heat pump unit is respectively connected with an air inlet and a liquid outlet of the water storage tank.
6. The range hood waste heat recovery system of claim 1, further comprising a heat pump control cabinet connected to the heat pump unit.
7. The range hood waste heat recovery system of claim 1, further comprising a condensate water tank connected to the smoke waste heat recovery device.
8. The range hood waste heat recovery system of claim 1, further comprising a flue gas purification spray device disposed in a flue of the range hood, the flue gas purification spray device being disposed between the range hood and the waste heat recovery device.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921746112.6U CN210601824U (en) | 2019-10-17 | 2019-10-17 | Waste heat recovery system of range hood |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921746112.6U CN210601824U (en) | 2019-10-17 | 2019-10-17 | Waste heat recovery system of range hood |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN210601824U true CN210601824U (en) | 2020-05-22 |
Family
ID=70691919
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201921746112.6U Active CN210601824U (en) | 2019-10-17 | 2019-10-17 | Waste heat recovery system of range hood |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN210601824U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110594827A (en) * | 2019-10-17 | 2019-12-20 | 珠海格力电器股份有限公司 | Waste heat recovery system of range hood and control method thereof |
| CN112592219A (en) * | 2020-12-28 | 2021-04-02 | 华中科技大学 | Aerobic composting system |
-
2019
- 2019-10-17 CN CN201921746112.6U patent/CN210601824U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110594827A (en) * | 2019-10-17 | 2019-12-20 | 珠海格力电器股份有限公司 | Waste heat recovery system of range hood and control method thereof |
| CN110594827B (en) * | 2019-10-17 | 2024-01-19 | 珠海格力电器股份有限公司 | Waste heat recovery system of range hood and control method thereof |
| CN112592219A (en) * | 2020-12-28 | 2021-04-02 | 华中科技大学 | Aerobic composting system |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| WO2020191564A1 (en) | Energy-saving system for adopting electric heat pump to deeply recycle smoke waste heat of thermal power plant for centralized heating | |
| CN107155280B (en) | A kind of integration ventilating and cooling heat reclamation device | |
| CN103062858A (en) | Air-conditioning system for recovering kitchen heat energy | |
| CN101922821A (en) | Method and heat pump device for simultaneous recovery of water and latent heat in high-humidity flue gas | |
| CN110594827B (en) | Waste heat recovery system of range hood and control method thereof | |
| CN109945277A (en) | An energy-saving system using electric heat pump to deeply recover waste heat from flue gas of thermal power plant for central heating | |
| CN103604249A (en) | Energy tower absorption type hot and cold water unit | |
| CN102997482A (en) | Direct-fired lithium bromide absorption cold-hot water unit for recovering flue gas waste heat under heating working condition | |
| CN104235826A (en) | Boiler flue gas waste heat recycling system | |
| CN210601824U (en) | Waste heat recovery system of range hood | |
| CN205037618U (en) | Cold warm water unit of absorption formula and generator waste heat recovery system | |
| CN106016835A (en) | System for recycling fuel gas and flue gas waste heat in multistage mode | |
| KR100939614B1 (en) | Air conditioner using hot water heated by solar energy | |
| CN104132541A (en) | Smoke afterheat recovery and gradient utilization system | |
| CN105509365A (en) | Efficient heating smoke water-heating type lithium bromide absorption type water chiller-heater unit | |
| CN209310307U (en) | A kind of bathroom utilizes heat pump structure with Multi-stage heat | |
| CN103629858A (en) | Direct-evaporation-type mine air return source heat pump system with spray dedusting function | |
| CN203687445U (en) | Energy tower type absorption cold hot water unit | |
| CN102997496A (en) | Direct-fired lithium bromide absorption cold-hot water unit provided with flue gas valves and used for recovering flue gas waste heat | |
| CN114777176B (en) | A green and energy-saving oil fume waste heat recovery system and working method | |
| CN102901264A (en) | Triple-effect vapor absorption refrigeration system | |
| CN103512271B (en) | Direct-fired three-purpose-type lithium bromide absorption-type cold and hot water unit with flue gas heat exchanger | |
| CN215295426U (en) | Smoke hot water type lithium bromide absorption cold-water heat pump unit | |
| CN109405348B (en) | Multistage heat utilization heat pump system for bathroom | |
| CN211261347U (en) | Low-emission high-energy-efficiency direct-combustion type lithium bromide absorption cold and hot water unit |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant |