CN210486036U - Gas water heater capable of exhausting gas quickly - Google Patents
Gas water heater capable of exhausting gas quickly Download PDFInfo
- Publication number
- CN210486036U CN210486036U CN201920856170.8U CN201920856170U CN210486036U CN 210486036 U CN210486036 U CN 210486036U CN 201920856170 U CN201920856170 U CN 201920856170U CN 210486036 U CN210486036 U CN 210486036U
- Authority
- CN
- China
- Prior art keywords
- gas
- flue
- fan
- air
- water
- 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
Images
Landscapes
- Housings, Intake/Discharge, And Installation Of Fluid Heaters (AREA)
Abstract
A rapid exhaust gas water heater: the gas-fired boiler comprises a shell, a heat exchanger, a gas system, an airflow system and a control system, wherein the gas system comprises a combustion chamber and a gas component, and the airflow system comprises a first fan, a side flue, a main flue, a gas inlet, an air inlet and an air outlet; the heat exchanger, the gas system, the first fan, the side flue and the main flue are arranged in the inner space of the shell; the gas component is arranged in the combustion chamber, the combustion chamber is provided with a gas inlet and an air inlet, the upper end of the combustion chamber is provided with a heat exchanger, and the top end of the heat exchanger is communicated with the main flue; the main flue is communicated with the side flue, and the main flue and the side flue are communicated with the external space of the shell through the air outlet; the first fan is arranged at the end part of the side flue, the air suction end of the first fan is communicated with the external space of the shell, and the air outlet end of the first fan is arranged along the pipeline direction of the side flue. When the gas water heater is used, tail gas in the gas water heater can be timely discharged under the action of negative pressure, and the tail gas cannot contact with the first fan.
Description
Technical Field
The utility model belongs to the technical field of the water heater, specifically, relate to a quick carminative gas heater.
Background
The gas water heater is a combustion appliance which takes gas as fuel and transfers heat to cold water flowing through an exchanger in a combustion heating mode to achieve the purpose of preparing hot water. The working principle of the gas water heater is as follows: the gas is used as fuel, the air is used as combustion-supporting material, the gas and the air are combusted, the heat generated by the combustion-supporting material is used for heating cold water through the heat exchanger, and the tail gas is discharged out of the shell of the water heater.
Gas water heaters in the prior art are generally classified into forced-draft gas water heaters and forced-draft gas water heaters. The forced-air type gas water heater is characterized in that a fan is arranged at an air inlet at the bottom of the gas water heater, external air is blown into an internal space of the water heater by the fan, however, excessive air in the gas water heater and tail gas generated by combustion reaction are difficult to discharge out of the gas water heater in time, accumulated gas has higher temperature and forms high pressure in the water heater, and potential safety hazards of water heater explosion can be caused. And strong formula gas heater of taking out sets up the fan for the tail gas vent at gas heater top, compares with strong drum gas heater, and strong formula gas heater of taking out promotes that the inside volume of air admission water heater is less relatively, and the gas is insufficient combustion under the not enough condition of air, can produce small carbon granule, and carbon granule gets into the fan along with tail gas, can accumulate in the fan is inside to damage the fan.
SUMMERY OF THE UTILITY MODEL
The utility model aims to provide a quick carminative gas heater to solve following technical problem: the tail gas generated by the combustion chamber of the dye water heater is discharged in time, so that the excessive tail gas is prevented from being accumulated in the water heater; the air inflow of the combustion chamber is improved, so that the fuel gas in the combustion chamber can be fully combusted under the combustion supporting of the air; the tail gas to be discharged does not enter the fan, and carbon deposition of the fan is prevented.
According to an aspect of the utility model, a quick carminative gas heater is provided: the gas-fired boiler comprises a shell, a heat exchanger, a gas system, an airflow system and a control system, wherein the gas system comprises a combustion chamber and a gas component, and the airflow system comprises a first fan, a side flue, a main flue, a gas inlet, an air inlet and an air outlet; the heat exchanger, the gas system, the first fan, the side flue and the main flue are arranged in the inner space of the shell; the gas component is arranged in the combustion chamber, the combustion chamber is provided with a gas inlet and an air inlet, the upper end of the combustion chamber is provided with a heat exchanger, the top end of the heat exchanger is communicated with the main flue, and the two ends of the heat exchanger are respectively provided with a water inlet pipe connector and a water outlet pipe connector; the main flue and the side flue are communicated with the outer space of the shell through an air outlet; the first fan is arranged at the end part of the side flue, the air suction end of the first fan is communicated with the external space of the shell, and the air outlet end of the first fan is arranged along the pipeline direction of the side flue.
Preferably, the pipeline of the side flue extends in the horizontal direction, the air outlet is arranged at one end of the side flue, which is far away from the first fan, and the air outlet is over against the air outlet end of the first fan.
Preferably, the air flow system further comprises an air passage check valve disposed at an end of the main flue remote from the air outlet.
Preferably, a smoke collecting cover is arranged between the heat exchanger and the main flue, the smoke collecting cover is installed at the top end of the heat exchanger, a main flue connector is arranged at the top of the smoke collecting cover, and one end of the main flue is installed at the main flue connector.
Preferably, the air inlet is arranged at the bottom of the combustion chamber and is opposite to the interface of the main flue.
Preferably, the air inlet is in a tapered pipe channel structure with a contracted radius, and the cross section radius of the channel is contracted along the direction of the inner space of the shell.
Preferably, the airflow system further comprises a second fan, a suction end of air of the second fan is communicated with the outer space of the shell, and an air outlet end of the second fan is fixedly installed at the air inlet.
Preferably, the control system comprises an operation panel, a main controller, a water inlet temperature sensor, a water outlet temperature sensor, a water flow sensor and a flame sensing needle; the operation panel and the main controller are arranged outside the shell, the water inlet temperature sensor and the water flow sensor are arranged on the water inlet pipe connector, the water outlet temperature sensor is arranged on the water outlet pipe connector, and the flame sensing needle is arranged on the side surface of the gas component; the main controller compares parameters set by a user on the operation panel with values returned by the water inlet temperature sensor, the water outlet temperature sensor, the water flow sensor and the flame sensing needle, and adjusts the water outlet temperature and the water outlet flow.
Compared with the prior art, the beneficial effects of the utility model are as follows:
1. use the utility model discloses a during gas heater, start the first fan that sets up at other flue tip, air current with higher speed is discharged from the air-out end of first fan via the air outlet of other flue from the casing, and the air of rapid flow makes the other flue and the department of converging of flue form the negative pressure in the other flue, and this negative pressure makes the tail gas of gas by the suction upward movement, is organized the back via the casing that the air outlet was discharged gas heater. From this, tail gas in the gas heater is in time discharged, and tail gas can not contact with first fan, prevents to carry secretly the entering first fan because the carbon granule that the insufficient combustion of gas produced via tail gas makes the easy washing of first fan, maintenance, prolongs the life of first fan. In addition, the air flue check valve is arranged to prevent tail gas from being guided to enter the combustion chamber, and the effect of promoting tail gas discharge is further realized.
2. When the main flue and the other flue join the department and have the negative pressure to produce, tail gas is discharged by the suction, and the outside air of water heater casing can be just to the setting at the main flue kneck in the inside entering combustion chamber of casing via air inlet, and the air inlet guarantees that the gas circuit is normal, promotes more air and is inhaled inside the casing, is favorable to the abundant burning of gas, prevents the carbon deposit. And air inlet is the mode of setting up of radius shrink taper pipe access structure, or adopts the second fan to insert air inlet, can both reach the inside effect of further promoting a large amount of air admission combustion chambers.
Drawings
Fig. 1 is an internal structural view of a gas water heater of embodiment 1;
fig. 2 is an operation principle diagram of the gas water heater of the embodiment 1;
fig. 3 is an internal structural view of the gas water heater of embodiment 2;
FIG. 4 is a schematic diagram of the operation of the gas water heater of embodiment 2;
fig. 5 is an external elevation view of the gas water heaters of embodiment 1 and embodiment 2.
In the above drawings, the correspondence relationship between each component and the number is as follows: 11. a first fan; 12. a side flue; 13. a main flue; 131. an air passage check valve; 14. an air outlet; 15. an air inlet; 16. a gas inlet; 17. a second fan; 2. a heat exchanger; 3. a combustion chamber; 31. a gas component; 41. a water inflow sensor; 42. an inlet water temperature sensor; 43. an effluent temperature sensor; 44. a flame sensing needle; 45. a main controller; 46. an operation panel; 5. a smoke collecting hood; 61. a water inlet pipe; 62. a water outlet pipe; 7. a housing.
DETAILED DESCRIPTION OF EMBODIMENT (S) OF INVENTION
In order to make the technical solution of the present invention better understood, the technical solution of the embodiments of the present invention will be clearly and completely described below, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments.
Example 1
As shown in fig. 1 and 5, the gas water heater of the present embodiment includes a housing 7, a heat exchanger 2, a gas system, an air flow system, and a control system. The gas system comprises a combustion chamber 3 and a gas assembly 31, in this embodiment the gas assembly 31 is provided as a fire box. The airflow system includes a first fan 11, a bypass duct 12, a main duct 13, an air duct check valve 131, a gas inlet 16, an air inlet 15, and an air outlet 14.
As shown in fig. 1: the heat exchanger 2, the gas system, the first fan 11, the side flue 12, the main flue 13 and the gas inlet 16 are arranged in the inner space of the shell 7: the gas component 31 is installed in the combustion chamber 3, the combustion chamber 3 is provided with a gas inlet 16 and an air inlet 15, the upper end of the combustion chamber 3 is provided with a heat exchanger 2, the top end of the heat exchanger 2 is provided with a smoke collecting hood 5, the top of the smoke collecting hood 5 is provided with a main flue interface, one end of a main flue 13 is installed at the main flue interface, and the main flue interface is provided with an air flue check valve 131; the two ends of the heat exchanger 2 are respectively provided with a water inlet pipe joint connected into the water inlet pipe 61 and a water outlet pipe joint connected into the water outlet pipe 62; the side flue 12 is horizontally arranged, the first fan 11 is arranged at the end part of the side flue 12, the air suction end of the first fan 11 is communicated with the external space of the shell 7, and the air outlet end of the first fan 11 is arranged along the pipeline direction of the side flue 12. The air outlet 14 is arranged at one end of the side flue 12 far away from the first fan 11, and the air outlet 14 is over against the air outlet end of the first fan 11. The main flue 13 communicates with the side flue 12, and the main flue 13 and the side flue 12 communicate with the space outside the housing 7 through the air outlet 14.
The control system comprises an operation panel 46, a main controller 45, an inlet water temperature sensor 43, an outlet water temperature sensor 42, a water flow sensor 41 and a flame sensing needle 44. The operation panel 46 is arranged on the front surface of the shell 7, the main controller is arranged on the side surface of the shell 7, the water inlet temperature sensor 43 and the water flow sensor 41 are arranged on the water inlet pipe joint, the water outlet temperature sensor 42 is arranged on the water outlet pipe joint, and the flame induction needle 44 is arranged on the side surface of the gas module 31.
When the gas water heater of the embodiment is used, the main controller 45 detects the water outlet temperature and the water outlet amount set on the operation panel by the user, adjusts the opening degree of the gas proportional valve according to the values returned by the water inlet temperature sensor 42, the water outlet temperature sensor 43, the water flow sensor 41 and the flame sensing needle 44, turns on the gas component 31, and starts the first fan 11, so as to heat the cold water flowing through the heat exchanger 2 and output the hot water in the bathroom.
The working state of the gas water heater of the embodiment for heating cold water is shown in fig. 2: starting the first fan 11, allowing air outside the housing 7 to enter the air suction end of the first fan 11, accelerating the first fan 11, spraying the air out of the air outlet end of the first fan 11, and directly discharging the air from the air outlet 14 to the external space of the housing 7 along the channel of the bypass flue 12; the main flue 13 is communicated with the side flue 12, the high-flow-rate gas in the side flue 12 enables the junction of the main flue 11 and the side flue 12 to generate negative pressure, so that the tail gas passing through the heat exchanger 2 is collected by the smoke collecting hood 5, the tail gas enters the side flue 12 through the air flue check valve 131 and the main flue 13 in sequence, and finally is discharged out of the shell 7 through the air outlet 14; meanwhile, as the tail gas in the shell 7 is sucked and exhausted, more air is promoted to enter the shell 7 through the air inlet 15 at the bottom of the shell 7, the air entering the shell 7 firstly enters the combustion chamber 3 to serve as combustion-supporting substances of the fuel gas, the fuel gas is promoted to be fully combusted, and carbon monoxide and carbon granules generated by insufficient combustion of the fuel gas are reduced. In the present embodiment, as shown in fig. 1 and 2, the air inlet 15 is configured as a conical channel structure with a constricted radius, the cross-sectional radius of the channel is constricted along the inner space of the housing 7, and the air inlet 15 faces the flue port, thereby promoting the air outside the housing 7 to be sucked by the negative pressure generated inside the housing 7.
In this embodiment, adopt first fan 11 to make the junction of bypass 12 and flue 13 produce the negative pressure, promote the inside tail gas discharge casing 7 of casing 7, avoid a large amount of high temperature tail gas to cause the potential safety hazard in the inside accumulation of casing 7, however, the tail gas that the gas burning produced can not with first fan 11 direct contact, avoid because the insufficient carbon grain that forms of burning gets into first fan 11, reduce the result of use and the life of first fan 11, and the outside air of casing 7 is also inhaled as combustion-supporting gas in the combustion chamber 3 by a large amount, combustion-supporting gas obtains timely replenishment, the gas that makes to get into combustion chamber 3 obtains abundant burning, the production of carbon monoxide and carbon granule has also been reduced.
Example 2
As shown in fig. 3 and 5, the gas water heater of the present embodiment includes a housing 7, a heat exchanger 2, a gas system, an air flow system, and a control system. The gas system comprises a combustion chamber 3 and a gas assembly 31, in this embodiment the gas assembly 31 is provided as a fire box. The airflow system comprises a first fan 11, a second fan 17, a side flue 12, a main flue 13, an air flue check valve 131, a fuel gas inlet 16, an air inlet 15 and an air outlet 14.
As shown in fig. 3: the heat exchanger 2, the gas system, the first fan 11, the side flue 12, the main flue 13 and the gas inlet 16 are arranged in the inner space of the shell 7: the gas component 31 is installed in the combustion chamber 3, the combustion chamber 3 is provided with a gas inlet 16 and an air inlet 15, the upper end of the combustion chamber 3 is provided with a heat exchanger 2, the top end of the heat exchanger 2 is provided with a smoke collecting hood 5, the top of the smoke collecting hood 5 is provided with a main flue interface, one end of a main flue 13 is installed at the main flue interface, and the main flue interface is provided with an air flue check valve 131; the two ends of the heat exchanger 2 are respectively provided with a water inlet pipe joint connected into the water inlet pipe 61 and a water outlet pipe joint connected into the water outlet pipe 62; the side flue 12 is horizontally arranged, the first fan 11 is arranged at the end part of the side flue 12, the air suction end of the first fan 11 is communicated with the external space of the shell 7, and the air outlet end of the first fan 11 is arranged along the pipeline direction of the side flue 12. The air outlet 14 is arranged at one end of the side flue 12 far away from the first fan 11, and the air outlet 14 is over against the air outlet end of the first fan 11. The main flue 13 is communicated with the side flue 12, and the main flue 13 and the side flue 12 are communicated with the external space of the shell 7 through an air outlet 14; the second fan 17 is installed at the air inlet 15, the air suction end of the air of the second fan 17 extends out of the back of the shell 7 and is communicated with the external space of the shell 7, and the air outlet end of the second fan 17 is connected into the air inlet 15.
The control system comprises an operation panel 46, a main controller 45, an inlet water temperature sensor 43, an outlet water temperature sensor 42, a water flow sensor 41 and a flame sensing needle 44. The operation panel 46 is arranged on the front surface of the shell 7, the main controller is arranged on the side surface of the shell 7, the water inlet temperature sensor 43 and the water flow sensor 41 are arranged on the water inlet pipe joint, the water outlet temperature sensor 42 is arranged on the water outlet pipe joint, and the flame induction needle 44 is arranged on the side surface of the gas module 31.
When the gas water heater of the embodiment is used, the main controller 45 detects the water outlet temperature and the water outlet amount set on the operation panel by the user, adjusts the opening degree of the gas proportional valve according to the values returned by the water inlet temperature sensor 42, the water outlet temperature sensor 43, the water flow sensor 41 and the flame sensing needle 44, turns on the gas component 31, and starts the first fan 11, so as to heat the cold water flowing through the heat exchanger 2 and output the hot water in the bathroom.
The working state of the gas water heater of the embodiment for heating cold water is shown in fig. 4. The first fan 11 is in a working state, air outside the shell 7 enters the air suction end of the first fan 11, is accelerated by the first fan 11, is sprayed out from the air outlet end of the first fan 11, and is directly discharged to the outer space of the shell 7 from the air outlet 14 along the channel of the side flue 12; the main flue 13 is communicated with the side flue 12, the high-flow-rate gas in the side flue 12 enables the junction of the main flue 11 and the side flue 12 to generate negative pressure, so that the tail gas passing through the heat exchanger 2 is collected by the smoke collecting hood 5, the tail gas enters the side flue 12 through the air flue check valve 131 and the main flue 13 in sequence, and finally is discharged out of the shell 7 through the air outlet 14. When the second fan 17 is in an operating state, air is sucked into the housing 7 from the back surface of the housing 7 through the second fan 17, reaches the combustion chamber 3 through the air inlet 15, and the air entering the combustion chamber 3 serves as a combustion supporter of the gas, thereby promoting the sufficient combustion of the gas and reducing carbon monoxide and carbon particles generated by the insufficient combustion of the gas.
In this embodiment, adopt first fan 11 to make the junction of bypass 12 and flue 13 produce the negative pressure, promote the inside tail gas discharge casing 7 of casing 7, avoid a large amount of high temperature tail gas to cause the potential safety hazard in the inside accumulation of casing 7, however, the tail gas that the gas burning produced can not with first fan 11 direct contact, avoid because the insufficient carbon grain that forms of burning gets into first fan 11, reduce the result of use and the life of first fan 11, and the outside air of casing 7 also is inhaled as combustion-supporting gas in the combustion chamber 3 by a large amount under the effect of second fan 17, the combustion-supporting gas obtains timely replenishment, the gas that impels to get into combustion chamber 3 obtains the abundant burning, the production of carbon monoxide and carbon grain has also been reduced.
It should be finally noted that the above embodiments are only used for illustrating the technical solutions of the present invention and not for limiting the same, and although the present invention is described in detail with reference to the above embodiments, it should be understood by those skilled in the art that after reading the present specification, the technical personnel can still modify or equivalently replace the specific embodiments of the present invention, but these modifications or changes do not depart from the scope of the claims of the present application.
Claims (8)
1. The utility model provides a quick carminative gas heater which characterized in that: the gas-fired boiler comprises a shell, a heat exchanger, a gas system, an airflow system and a control system, wherein the gas system comprises a combustion chamber and a gas component, and the airflow system comprises a first fan, a side flue, a main flue, a gas inlet, an air inlet and an air outlet;
the heat exchanger, the gas system, the first fan, the bypass flue and the main flue are arranged in the inner space of the shell;
the gas component is arranged in the combustion chamber, the combustion chamber is provided with the gas inlet and the air inlet, the upper end of the combustion chamber is provided with the heat exchanger, the top end of the heat exchanger is communicated with the main flue, and two ends of the heat exchanger are respectively provided with a water inlet pipe connector and a water outlet pipe connector;
the main flue and the side flue are communicated with the outer space of the shell through the air outlet;
the first fan is arranged at the end part of the side flue, the air suction end of the first fan is communicated with the external space of the shell, and the air outlet end of the first fan is arranged along the pipeline direction of the side flue.
2. A rapid-venting gas water heater as set forth in claim 1, wherein: the pipeline of the side flue extends in the horizontal direction, the gas outlet is formed in the end, far away from the first fan, of the side flue, and the gas outlet is opposite to the air outlet end of the first fan.
3. A rapid-venting gas water heater as set forth in claim 1, wherein: the airflow system further comprises an air flue check valve, and the air flue check valve is arranged at one end, far away from the air outlet, of the main flue.
4. A rapid-venting gas water heater as set forth in claim 3, wherein: the heat exchanger with be equipped with the collection petticoat pipe between the flue header, the collection petticoat pipe is installed the heat exchanger top, collection petticoat pipe top is equipped with the flue header interface, the one end of flue header is installed the flue header interface department.
5. The rapid draft gas water heater of claim 4, wherein: the air inlet is arranged at the bottom of the combustion chamber and is opposite to the interface of the main flue.
6. The rapid draft gas water heater of claim 5, wherein: the air inlet is of a taper pipe channel structure with a contracted radius, and the radius of the cross section of the channel is contracted along the direction of the inner space of the shell.
7. The rapid draft gas water heater of claim 5, wherein: the air flow system further comprises a second fan, the air suction end of the air of the second fan is communicated with the external space of the shell, and the air outlet end of the second fan is fixedly installed at the air inlet.
8. A rapid-venting gas water heater as set forth in any one of claims 1-7, wherein: the control system comprises an operation panel, a main controller, a water inlet temperature sensor, a water outlet temperature sensor, a water flow sensor and a flame sensing needle; the operation panel and the main controller are arranged outside the shell, the water inlet temperature sensor and the water flow sensor are installed on the water inlet pipe connector, the water outlet temperature sensor is installed on the water outlet pipe connector, and the flame induction needle is installed on the side surface of the gas component; the main control unit compares the parameters set by the user on the operation panel with the values returned by the water inlet temperature sensor, the water outlet temperature sensor, the water flow sensor and the flame sensing needle, and adjusts the water outlet temperature and the water outlet flow.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920856170.8U CN210486036U (en) | 2019-06-06 | 2019-06-06 | Gas water heater capable of exhausting gas quickly |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920856170.8U CN210486036U (en) | 2019-06-06 | 2019-06-06 | Gas water heater capable of exhausting gas quickly |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN210486036U true CN210486036U (en) | 2020-05-08 |
Family
ID=70513134
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201920856170.8U Active CN210486036U (en) | 2019-06-06 | 2019-06-06 | Gas water heater capable of exhausting gas quickly |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN210486036U (en) |
-
2019
- 2019-06-06 CN CN201920856170.8U patent/CN210486036U/en active Active
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN205878589U (en) | Hanging stove with vortex device | |
| CN210486036U (en) | Gas water heater capable of exhausting gas quickly | |
| CN205481772U (en) | Take gas heater of direct current fan | |
| CN105805784B (en) | Automatic water-supply oil-gas two-way energy-saving stove | |
| CN206094169U (en) | Combustion -supporting device of secondary air supply of heating stove | |
| CN104848201B (en) | Multipurpose horizontal heating furnace | |
| CN202618250U (en) | Double-pressure air inducing heating device | |
| CN209688811U (en) | A kind of combustion chamber | |
| CN210566301U (en) | Boiler high temperature flue gas recirculation FGR butterfly valve control system | |
| CN208998096U (en) | Hot-blast stove | |
| CN209042757U (en) | A kind of smoke discharging device for heat-exchanging furnace | |
| CN202485204U (en) | Double-air-blower double-control energy-saving air heater | |
| CN206958979U (en) | A kind of energy-saving heating device | |
| CN206831821U (en) | Gas heater | |
| CN204648207U (en) | Multipurpose horizontal heating furnace | |
| CN217302773U (en) | Special living beings hot-blast furnace of horizontal drying-machine | |
| CN205690669U (en) | A kind of effective formula full water jacket numerical control boiler | |
| CN205655483U (en) | Low hot water stove | |
| CN204574463U (en) | A kind of heating stove | |
| CN105202530B (en) | A kind of biomass stove of environmental protection | |
| CN205119027U (en) | Biomass furnace of environmental protection | |
| CN207849426U (en) | A kind of energy-saving environmental protection heating stove | |
| CN214307061U (en) | Energy-efficient living beings environmental protection boiler | |
| CN208282403U (en) | fuel gas hot-blast stove | |
| CN218955180U (en) | Wall-mounted efficient heat exchange water heater |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant |