CN112709290A - Sleeve type wall-mounted furnace bathroom pipeline cleaning control method and wall-mounted furnace - Google Patents
Sleeve type wall-mounted furnace bathroom pipeline cleaning control method and wall-mounted furnace Download PDFInfo
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- CN112709290A CN112709290A CN202011456268.8A CN202011456268A CN112709290A CN 112709290 A CN112709290 A CN 112709290A CN 202011456268 A CN202011456268 A CN 202011456268A CN 112709290 A CN112709290 A CN 112709290A
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- E—FIXED CONSTRUCTIONS
- E03—WATER SUPPLY; SEWERAGE
- E03C—DOMESTIC PLUMBING INSTALLATIONS FOR FRESH WATER OR WASTE WATER; SINKS
- E03C1/00—Domestic plumbing installations for fresh water or waste water; Sinks
- E03C1/02—Plumbing installations for fresh water
- E03C1/025—Water supply lines as such, e.g. shower hoses
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- E—FIXED CONSTRUCTIONS
- E03—WATER SUPPLY; SEWERAGE
- E03B—INSTALLATIONS OR METHODS FOR OBTAINING, COLLECTING, OR DISTRIBUTING WATER
- E03B7/00—Water main or service pipe systems
- E03B7/006—Arrangements or methods for cleaning or refurbishing water conduits
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24H—FLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT-GENERATING MEANS, e.g. HEAT PUMPS, IN GENERAL
- F24H9/00—Details
- F24H9/12—Arrangements for connecting heaters to circulation pipes
- F24H9/13—Arrangements for connecting heaters to circulation pipes for water heaters
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24H—FLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT-GENERATING MEANS, e.g. HEAT PUMPS, IN GENERAL
- F24H9/00—Details
- F24H9/20—Arrangement or mounting of control or safety devices
- F24H9/2007—Arrangement or mounting of control or safety devices for water heaters
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Thermal Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Hydrology & Water Resources (AREA)
- Public Health (AREA)
- Water Supply & Treatment (AREA)
- Cleaning By Liquid Or Steam (AREA)
Abstract
The invention relates to the technical field of wall-mounted furnaces, in particular to a sleeve type wall-mounted furnace and a method for cleaning and controlling a bathroom pipeline. The cleaning control method can timely find the blockage of the bathroom pipeline and automatically clean the bathroom pipeline, avoids influencing user experience due to the blockage of the bathroom pipeline, and has the advantages of ensuring the good operation of the wall-hanging furnace and prolonging the service life of the wall-hanging furnace.
Description
Technical Field
The invention relates to the technical field of wall-mounted furnaces, in particular to a sleeve type wall-mounted furnace bathroom pipeline cleaning control method and a wall-mounted furnace.
Background
The wall-hanging stove is also called as gas wall-hanging stove, which uses natural gas, artificial gas or liquefied gas as fuel, the fuel is output by a burner, after burning in a combustion chamber, the heat is absorbed by a heat exchanger, the circulating water in the heating system is heated in a reciprocating way when passing through the heat exchanger, thereby continuously outputting the heat to the building and providing a heat source for the building. The general dual-purpose gas wall-mounted boiler has the heating function and the water heating function.
With the popularization and application of the wall-mounted boiler, the requirements of people on the wall-mounted boiler are higher and higher, but when the wall-mounted boiler uses domestic hot water, new water needs to be continuously filled into the wall-mounted boiler, so that the scaling rate of the heat exchanger is greatly increased. Along with the continuous thickening of the incrustation scale attached to the inner wall of the heat exchanger, the heat exchange efficiency of the wall-mounted boiler is greatly reduced, and the wall-mounted boiler mainly shows symptoms of increased air consumption, insufficient heat supply, cold-time heating of sanitary hot water, reduced hot water quantity and the like.
The wall-mounted boiler can be divided into a single-function type and a heating and bathing dual-purpose type according to the purposes, wherein the heating and bathing dual-purpose type can be divided into a double-pipe wall-mounted boiler and a plate-exchange wall-mounted boiler. The sleeve type wall-mounted furnace realizes the functions of heating and bathroom through the sleeve type heat exchanger. Because of bushing type heat exchanger is bathroom pipeline overcoat heating pipeline, bathroom pipeline pipe diameter is less, along with the live time extension of hanging stove, the bathroom pipeline blocks up easily, if fail in time to wash the bathroom pipeline this moment, the bathroom route is stifled dead to cause the bathroom function inefficacy, influence the life of hanging stove.
Disclosure of Invention
In order to overcome the defects in the prior art, the invention provides a sleeve type wall-mounted furnace and a method for cleaning and controlling a bathroom pipeline of the wall-mounted furnace.
The technical scheme of the invention is as follows: a method for controlling cleaning of a bushing type wall-hanging furnace sanitary pipeline comprises the following steps: the method comprises the steps of collecting blockage parameter information of the bathroom pipeline, wherein the blockage parameter information comprises water flow, pipeline drift diameter and pipe diameter drift diameter percentage of the bathroom pipeline of the wall-mounted furnace.
According to the bathroom pipeline jam parameter information, judging the bathroom pipeline jam condition includes:
when the percentage of the diameter of the pipe is less than 80%, judging that the bathroom pipeline of the wall-hanging furnace is slightly blocked; when the percentage of the diameter of the pipe is less than 60%, judging that the bathroom pipeline of the wall-hanging furnace is seriously blocked; when the percentage of the diameter of the pipe is less than 30%, judging that the bathroom pipeline of the wall-hanging furnace is completely blocked; the blockage condition of the bathroom pipeline is displayed, and whether the bathroom pipeline is cleaned or not is reminded.
Further, when the blockage condition of the bathroom pipeline is slight blockage, serious blockage or complete blockage, cleaning reminding information is sent.
Furthermore, the blockage parameter information of the bathroom pipeline is collected, and the wall-mounted furnace needs to be switched to the bathroom pipeline internal circulation mode.
Further, the acquisition of the blockage parameter information of the sanitary pipeline comprises: collecting water flow of a bathroom pipeline of the wall-mounted boiler through a water flow sensor arranged at a tap water inlet pipe; deducing the pipeline drift diameter from the water flow;
according to the formula p ═ s1/s0The percentage of the diameter of the pipe is converted,
wherein p is the percentage of the diameter of the pipe;
s0designing the diameter of the pipeline;
s1is the drift diameter of the pipeline.
Further, when the blockage condition of the bathroom pipeline is slight blockage, a prompt is sent to prompt whether a cleaning function is executed or not, if the selection is yes, the cleaning agent module works to clean the circulating pipeline until the pipe diameter drift diameter percentage is detected to be more than 80%, the cleaning function is stopped, and the bathroom pipeline enters a heating or bathroom mode according to the requirements of users; if not, directly entering a heating or bathroom mode according to the user requirement.
When the blockage condition of the bathroom pipeline is serious blockage, the program sends a prompt and forcibly performs a cleaning function, the cleaning agent module works to clean the circulating pipeline until the diameter drift diameter percentage is detected to be more than 80%, the cleaning function is stopped, and the bathroom pipeline enters a heating or bathroom mode according to the requirement of a user.
When the blockage condition of the bathroom pipeline is complete blockage, the bathroom mode is forbidden, a manual cleaning prompt is sent out, and a fault alarm is given out; if a user has a heating demand, the user can enter a heating mode to normally operate.
A wall-mounted furnace comprises a wall-mounted furnace body and an internal circulation pipeline cleaning module communicated with the wall-mounted furnace body; the internal circulation pipeline cleaning module comprises a tap water inlet pipe, a bathroom water outlet pipe and a bypass pipe arranged between the tap water inlet pipe and the bathroom water outlet pipe; the bypass pipe is provided with a cleaning agent module communicated with the bypass pipe; an electric three-way valve selectively communicated with the bypass pipe is arranged on the bathroom water outlet pipe; the tap water inlet pipe is provided with an internal circulation water pump and a water flow sensor, and the water flow sensor is used for collecting pipeline blockage data.
Further, the cleaning agent module comprises a communicating cavity, a cleaning agent container and a driving mechanism, the communicating cavity is communicated with the bypass pipe, the cleaning agent container is arranged in the communicating cavity and connected with the output end of the driving mechanism, and the driving mechanism drives the cleaning agent container to move up and down in the communicating cavity so as to press the cleaning agent in the cleaning agent container into the bypass pipe.
Preferably, the driving mechanism is a motor or a hydraulic oil cylinder.
Further, the cleaning agent container is arranged to be of a box-shaped structure.
And the controller is electrically connected with the electric three-way valve, the cleaning agent module, the flow sensor and the water pump.
Furthermore, the washing reminding device also comprises a washing reminding module electrically connected with the controller.
The invention achieves the following beneficial effects:
according to the technical scheme, the blockage parameter information of the bathroom pipeline is collected, the blockage condition of the bathroom pipeline is judged according to the blockage parameter information of the bathroom pipeline, and whether the bathroom pipeline is cleaned or not is reminded according to the blockage condition of the bathroom pipeline, so that the blockage of the bathroom pipeline is timely found and the bathroom pipeline is automatically cleaned, the influence on user experience caused by the blockage of the bathroom pipeline is avoided, the good operation of the wall-hanging furnace is ensured, and the service life of the wall-hanging furnace is prolonged.
Drawings
Fig. 1 is a flow chart of a method for controlling the cleaning of a sanitary pipeline of a bushing type wall-hanging furnace according to the present invention.
FIG. 2 is a graph of the relationship between the path of the piping and the flow rate of water in accordance with the present invention.
FIG. 3 is a schematic view of the circulation of the bathroom pipeline for detecting the percentage of the diameter of the pipe according to the present invention.
FIG. 4 is a schematic diagram of the sanitary piping cycle for starting the cleaning agent module according to the present invention.
In the figure, 1, a wall-hanging stove body; 11. a heat exchanger; 12. a gas pipe; 13. a heating water outlet pipe; 14. a heating water return pipe; 2. an internal circulation pipeline cleaning module; 21. a bathroom water outlet pipe; 22. a tap water inlet pipe; 23. a bypass pipe; 24. an electric three-way valve; 25. a water flow sensor; 26. a water pump; 27. a cleaning agent module; 271. a drive mechanism; 272. a cleaning agent container; 273. a communicating cavity; 3. and a controller.
Detailed Description
To facilitate an understanding of the present invention by those skilled in the art, specific embodiments thereof are described below with reference to the accompanying drawings.
A method for controlling cleaning of a bushing type wall-hanging furnace sanitary pipeline comprises the following steps: the method comprises the steps of collecting blockage parameter information of the bathroom pipeline, wherein the blockage parameter information comprises water flow, pipeline drift diameter and pipe diameter drift diameter percentage of the bathroom pipeline of the wall-mounted furnace.
According to the bathroom pipeline jam parameter information, judging the bathroom pipeline jam condition includes: slight occlusion, severe occlusion, and complete occlusion.
According to the blockage parameter information, judging the blockage condition of the bathroom pipeline, comprising the following steps: when the percentage of the diameter of the pipe is less than 80%, judging that the bathroom pipeline of the wall-hanging furnace is slightly blocked; when the percentage of the diameter of the pipe is less than 60%, judging that the bathroom pipeline of the wall-hanging furnace is seriously blocked; when the percentage of the diameter of the pipe is less than 30%, judging that the bathroom pipeline of the wall-hanging furnace is completely blocked; the blockage condition of the bathroom pipeline is displayed, and whether the bathroom pipeline is cleaned or not is reminded.
As shown in fig. 1, the pipe diameter blockage detection function is started, and the blockage parameter information of the bathroom pipeline is collected. The hanging stove switches over to bathroom pipeline inner loop mode, and hanging stove bathroom pipeline's water intaking valve and outlet valve close, and electric three-way valve 24 switches over the pipeline route to forming a circulation pipeline by bathroom outlet pipe 21, bypass pipe 23, cleaner module 27 and running water oral siphon 22, and the water pump 26 that sets up on running water oral siphon 22 starts work, water pump 26 provides power for the circulation pipeline, and rivers sensor 25 detects the discharge of circulation pipeline, deduces the pipeline latus rectum through discharge, calculates through the pipeline latus rectum and reachs the pipe diameter latus rectum percentage to gather bathroom pipeline jam parameter information.
According to the bathroom pipeline jam parameter information, judging the bathroom pipeline jam condition includes:
the pipe diameter drift diameter percentage p is less than 80%, the bathroom pipeline in the wall-mounted furnace is considered to be slightly blocked at the moment, the program sends out a prompt to remind and prompt whether to execute a cleaning function, if the selection is yes, the cleaning agent box of the cleaning agent module 27 is moved downwards to be merged into the bypass pipe 23 of the bathroom pipeline, the water pump 26 provides power to carry out internal circulation, water flow is dissolved and carried with the cleaning agent through the cleaning agent module 27, the circulation pipeline is cleaned, the cleaning function is stopped until the pipe diameter drift diameter percentage p is detected to be more than 80%, and the heating or bathroom mode is started according to the requirements of users; if not, directly entering a heating or bathroom mode according to the user requirement.
Pipe diameter latus rectum percentage p < 60%, think that there is serious jam in the inside bathroom pipeline of hanging stove this moment, need wash, the program forces to carry out cleaning function, cleaner module 27 moves down the cleaner box and merges into in bathroom pipeline's bypass pipe 23, water pump 26 provides power and carries out the inner loop, and rivers are dissolved through cleaner module 27 and are carried the cleaner, wash the circulation pipeline, stop cleaning function until detecting pipe diameter latus rectum percentage > 80% after, get into heating or bathroom mode according to user's demand.
The pipe diameter drift diameter percentage p is less than 30%, at the moment, the bathroom pipeline in the wall-mounted furnace is considered to be completely blocked, the bathroom mode is forbidden, the manual cleaning prompt is sent out, and the fault alarm is given out; if a user has a heating demand, the user can enter a heating mode to normally operate; after a user cleans the bathroom pipeline, the wall hanging furnace is restarted, the program defaults to execute one bathroom pipeline circulation detection, when the detected pipe diameter drift diameter percentage p is larger than 80%, the fault alarm is not generated, and the product can normally enter a bathroom mode.
And when the blockage condition of the bathroom pipeline is slight blockage, serious blockage or complete blockage, sending out cleaning reminding information. The cleaning reminder can be a sound or a display, but does not affect the heating and bathroom modes of the wall-hanging stove normally used by the user.
According to the bathroom pipeline jam situation, whether the bathroom pipeline is cleaned or not is reminded, the bathroom pipeline is found to be blocked and the bathroom pipeline is automatically cleaned in time, the influence on user experience caused by the blockage of the bathroom pipeline is avoided, the good operation of the wall-hanging furnace is guaranteed, and the service life of the wall-hanging furnace is prolonged.
As shown in FIG. 2, the relationship between the channel diameter and the water flow is tested during product design and is built in the product.
When the pipe diameter blockage detection function is started, the water flow sensor 25 detects the water flow of the circulation pipeline, and according to the relation between the pipeline drift diameter and the water flow, the measured pipeline drift diameter is deduced from the measured water flow.
According to the formula p ═ s1/s0Converting the pipe diameter and diameter percentage, wherein p is the pipe diameter and diameter percentage; s0Designing the diameter of the pipeline; s1Is the drift diameter of the pipeline.
Before cleaning the bathroom pipelines, the percentage of blockage of the bathroom pipelines needs to be detected, as shown in fig. 3, the wall-hanging stove comprises a wall-hanging stove body 1 and an internal circulation pipeline cleaning module 2 communicated with the wall-hanging stove body 1.
The internal circulation pipeline cleaning module 2 comprises a tap water inlet pipe 22, a bathroom water outlet pipe 21 and a bypass pipe 23 arranged between the tap water inlet pipe 22 and the bathroom water outlet pipe 21; the bypass pipe 23 is provided with a cleaning agent module 27 communicated with the bypass pipe 23; an electric three-way valve 24 selectively communicated with the bypass pipe 23 is arranged on the bathroom water outlet pipe 21; the running water inlet pipe 22 is provided with a water pump 26 and a water flow sensor 25 for internal circulation, and the water flow sensor 25 is used for collecting pipeline blockage data.
Specifically, the electric three-way valve 24 includes two inlets, the bathroom water outlet pipe 21 is communicated with the inlet of the electric three-way valve 24, one outlet of the electric three-way valve 24 is communicated with one end of the bypass pipe 23, and the other outlet of the electric three-way valve 24 is communicated with an external pipeline. When the wall-mounted boiler is normally used, the outlet of the electric three-way valve 24 communicated with one end of the bypass pipe 23 is closed, and the inlet of the electric three-way valve 24 communicated with the bathroom water outlet pipe 21 and the outlet communicated with an external pipeline are communicated. The wall-mounted furnace is switched to the internal circulation mode of the bathroom pipeline, the water inlet valve and the water outlet valve of the bathroom pipeline of the wall-mounted furnace are closed, the outlet of the electric three-way valve 24 communicated with the external pipeline is closed, and the inlet of the electric three-way valve 24 communicated with the bathroom water outlet pipe 21 and the outlet of the electric three-way valve communicated with one end of the bypass pipe 23 are communicated.
The wall-mounted furnace also comprises a controller 3, wherein the controller 3 is electrically connected with the electric three-way valve 24, the cleaning agent module 27, the flow sensor and the water pump 26. The hanging stove still includes the washing warning module of being connected with controller 3 electricity.
The wall-mounted boiler body 1 comprises a heat exchanger 11, a gas pipe 12, a heating water outlet pipe 13 and a heating water return pipe 14.
The cleaning agent module 27 comprises a communication cavity 273, a cleaning agent container 272 and a driving mechanism 271, the communication cavity 273 is communicated with the bypass pipe 23, the cleaning agent container 272 is arranged in the communication cavity 273, the cleaning agent container 272 is connected with the output end of the driving mechanism 271, and the driving mechanism 271 drives the cleaning agent container 272 to move up and down in the communication cavity 273 so as to press the cleaning agent in the cleaning agent container 272 into the bypass pipe 23. Specifically, the driving mechanism 271 may be a motor or a hydraulic cylinder. Preferably, the cleaning agent container 272 is provided in a box-like structure.
It should be noted that the cleaning agent module 27 does not operate when the blockage detection function is performed, and the cleaning agent container 272 is disposed at the upper portion of the cleaning agent module 27 and does not enter the bypass pipe 23 of the sanitary pipeline.
As shown in fig. 4, when the sanitary pipeline needs to be cleaned, the controller 3 controls the cleaning agent module 27 to work, the driving mechanism 271 works to drive the cleaning agent container 272 to move downwards and merge into the bypass pipe 23 of the sanitary pipeline, the water pump 26 provides power to perform internal circulation, and the water flow is dissolved by the cleaning agent module 27 to carry the cleaning agent, so as to clean the circulation pipeline. Preferably, the cleaning agent container is provided in a box-like configuration.
According to the bathroom pipeline jam situation, whether the bathroom pipeline is cleaned or not is reminded, the bathroom pipeline is found to be blocked and the bathroom pipeline is automatically cleaned in time, the influence on user experience caused by the blockage of the bathroom pipeline is avoided, the good operation of the wall-hanging furnace is guaranteed, and the service life of the wall-hanging furnace is prolonged.
The above-described embodiments of the present invention do not limit the scope of the present invention. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present invention should be included in the scope of the claims of the present invention.
Claims (10)
1. A method for controlling cleaning of a bathroom pipeline of a sleeve type wall-mounted furnace is characterized by comprising the following steps: collecting the blockage parameter information of the bathroom pipeline, wherein the blockage parameter information comprises the water flow, the pipeline drift diameter and the pipe diameter drift diameter percentage of the bathroom pipeline of the wall-mounted furnace; according to the bathroom pipeline jam parameter information, judging the bathroom pipeline jam condition includes:
when the percentage of the diameter of the pipe is less than 80%, judging that the bathroom pipeline of the wall-hanging furnace is slightly blocked; when the percentage of the diameter of the pipe is less than 60%, judging that the bathroom pipeline of the wall-hanging furnace is seriously blocked; when the percentage of the diameter of the pipe is less than 30%, judging that the bathroom pipeline of the wall-hanging furnace is completely blocked; the blockage condition of the bathroom pipeline is displayed.
2. The method of claim 1, further comprising: and when the blockage condition of the bathroom pipeline is slight blockage, serious blockage or complete blockage, sending out cleaning reminding information.
3. The method of claim 1, wherein the wall-mounted boiler is switched to the bathroom pipeline internal circulation mode when the bathroom pipeline blockage parameter information is collected.
4. The method of claim 1, wherein the collecting sanitary pipe plugging parameter information comprises: collecting water flow of a bathroom pipeline of the wall-mounted boiler through a water flow sensor (25) arranged at a tap water inlet pipe (22); pushing the pipeline drift diameter out of the water flow;
according to the formula p ═ s1/s0The percentage of the diameter of the pipe is converted,
wherein p is the percentage of the diameter of the pipe;
s0designing the diameter of the pipeline;
s1is the drift diameter of the pipeline.
5. The method of claim 1, comprising:
when the blockage condition of the bathroom pipeline is slight blockage, a prompt is sent to prompt whether a cleaning function is executed or not, if so, a cleaning agent module (27) works to clean the circulating pipeline until the percentage of the diameter of the pipe is detected to be more than 80%, the cleaning function is stopped, and the bathroom pipeline enters a heating or bathroom mode according to the requirement of a user; if not, directly entering a heating or bathroom mode according to the user requirement;
when the blockage condition of the bathroom pipeline is serious blockage, the wall-mounted furnace gives a prompt and forcibly performs a cleaning function, the cleaning agent module (27) works to clean the circulating pipeline until the diameter percentage of the pipe is detected to be more than 80%, the cleaning function is stopped, and the bathroom pipeline enters a heating or bathroom mode according to the requirements of users;
when the blockage condition of the bathroom pipeline is complete blockage, the bathroom mode is forbidden, a manual cleaning prompt is sent out, and a fault alarm is given out; if a user has a heating demand, the user can enter a heating mode to normally operate.
6. A wall-mounted furnace comprises a wall-mounted furnace body (1) and is characterized by further comprising an internal circulation pipeline cleaning module (2) communicated with the wall-mounted furnace body (1); the internal circulation pipeline cleaning module (2) comprises a tap water inlet pipe (22), a bathroom water outlet pipe (21) and a bypass pipe (23) arranged between the tap water inlet pipe (22) and the bathroom water outlet pipe (21); a cleaning agent module (27) communicated with the bypass pipe (23) is arranged on the bypass pipe (23); an electric three-way valve (24) selectively communicated with the bypass pipe (23) is arranged on the bathroom water outlet pipe (21); an internal circulation water pump (26) and a water flow sensor (25) are arranged on the tap water inlet pipe (22), and the water flow sensor (25) is used for collecting pipeline blockage data.
7. The wall hanging stove according to claim 6, characterized in that the cleaning agent module (27) comprises a communication cavity (273), a cleaning agent container (272) and a driving mechanism (271), the communication cavity (273) is communicated with the bypass pipe (23), the cleaning agent container (272) is arranged in the communication cavity (273), the cleaning agent container (272) is connected with an output end of the driving mechanism (271), and the driving mechanism (271) drives the cleaning agent container (272) to move up and down in the communication cavity (273) so as to press the cleaning agent in the cleaning agent container (272) into the bypass pipe (23).
8. Wall hanging stove according to claim 7, characterised in that the cleaning agent container (272) is provided as a box-like structure.
9. The hanging stove according to claim 6, characterized by further comprising a controller (3), the controller (3) being electrically connected with the electric three-way valve (24), the cleaning agent module (27), the flow sensor and the water pump (26).
10. The hanging stove according to claim 6, characterized by further comprising a cleaning reminder module electrically connected with the controller (3).
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011456268.8A CN112709290A (en) | 2020-12-11 | 2020-12-11 | Sleeve type wall-mounted furnace bathroom pipeline cleaning control method and wall-mounted furnace |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202011456268.8A CN112709290A (en) | 2020-12-11 | 2020-12-11 | Sleeve type wall-mounted furnace bathroom pipeline cleaning control method and wall-mounted furnace |
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Application publication date: 20210427 |