CN113137592B - Scale monitoring method for steam generator - Google Patents
Scale monitoring method for steam generator Download PDFInfo
- Publication number
- CN113137592B CN113137592B CN202110379006.4A CN202110379006A CN113137592B CN 113137592 B CN113137592 B CN 113137592B CN 202110379006 A CN202110379006 A CN 202110379006A CN 113137592 B CN113137592 B CN 113137592B
- Authority
- CN
- China
- Prior art keywords
- scale
- control system
- steam generator
- water
- drainage
- 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
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F22—STEAM GENERATION
- F22B—METHODS OF STEAM GENERATION; STEAM BOILERS
- F22B37/00—Component parts or details of steam boilers
- F22B37/02—Component parts or details of steam boilers applicable to more than one kind or type of steam boiler
- F22B37/38—Determining or indicating operating conditions in steam boilers, e.g. monitoring direction or rate of water flow through water tubes
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F22—STEAM GENERATION
- F22B—METHODS OF STEAM GENERATION; STEAM BOILERS
- F22B37/00—Component parts or details of steam boilers
- F22B37/02—Component parts or details of steam boilers applicable to more than one kind or type of steam boiler
- F22B37/48—Devices for removing water, salt, or sludge from boilers; Arrangements of cleaning apparatus in boilers; Combinations thereof with boilers
- F22B37/54—De-sludging or blow-down devices
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F22—STEAM GENERATION
- F22B—METHODS OF STEAM GENERATION; STEAM BOILERS
- F22B37/00—Component parts or details of steam boilers
- F22B37/02—Component parts or details of steam boilers applicable to more than one kind or type of steam boiler
- F22B37/56—Boiler cleaning control devices, e.g. for ascertaining proper duration of boiler blow-down
- F22B37/565—Blow-down control, e.g. for ascertaining proper duration of boiler blow-down
Landscapes
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Cleaning By Liquid Or Steam (AREA)
- Control Of Steam Boilers And Waste-Gas Boilers (AREA)
Abstract
The invention relates to a scale monitoring method of a steam generator, which comprises the following steps: step one, determining the scale formation degree of the scale to be cleaned, reading and recording the limit resistance value R0 between the liquid probe and the metal part under the scale formation degree of the scale to be cleaned, and storing the limit resistance value on a control system; step two, in daily use, when the steam generator is in a non-working state, the control system executes an emptying task to empty the water body in the water storage cavity, and then the control system reads and records the monitoring resistance value between the liquid probe and the metal part in the emptying state as R1; step three, the control system calls R1 and R0 to compare; when R1 is less than or equal to R0, the control system judges that the scale reaches or exceeds the scale degree of the scale to be cleaned; when R1 is more than R0, the control system judges that the scale does not reach the scale degree of the scale to be cleaned. The scale monitoring method is high in reliability and accuracy, is suitable for water bodies with different water qualities, and effectively ensures daily work of the steam generator.
Description
Technical Field
The invention relates to a steam generator, in particular to a scale monitoring method of the steam generator.
Background
As the water contains various dissolved salts and exists in the form of ions; when a pair of electrodes is inserted into water, after the electric field is applied, charged ions can move in a certain direction under the action of the electric field, namely anions in the water move to the anode, and the cations move to the cathode, so that the water body has a conductive effect. In addition, after the container for storing water is heated for a plurality of times, calcium sulfate (CaSO 4) which is slightly dissolved in water in the water body can be separated out due to evaporation of the water body, and the originally dissolved calcium bicarbonate (Ca (HCO 3) 2) and magnesium bicarbonate (Mg (HCO 3) 2) are decomposed in boiling water and carbon dioxide (CO 2) is released, so that poorly soluble calcium carbonate (CaCO 3) and magnesium hydroxide (Mg (OH) 2) are further generated to be precipitated, mgCO3 is sometimes generated, and scale is formed; the more Ca, mg and other substances in the water body, the easier and faster the scale is formed; the higher the content of Ca, mg and the like, the worse the water quality, and conversely, the lower the content of Ca, mg and the like, the better the water quality.
Many products exist in the market, which apply the conductive characteristics of the water body; the related product at least comprises a steam generator, a pair of electrodes are arranged in a cavity for storing water, and the water body is monitored by monitoring the resistance value between the two electrodes; however, in daily use, after the steam generator is used for a long time, a large amount of scale is formed in the water storage cavity, and at least the following problems are caused by the existence of the scale: (1) affecting the normal operation of the electrode to cause misjudgment, (2) reducing heating efficiency, increasing energy consumption, and the like; for this reason, the scale needs to be cleaned, the existing method is that a scale cleaning period is set before the steam generator leaves the factory, namely, when the working time of the steam generator is full of one scale cleaning period, a user is prompted to clean the scale; however, this is an unreliable way of scale monitoring: if the water quality of the water body used daily is relatively good, the scaling speed in the cavity is relatively slow, and the scaling degree is not too serious even if the scaling period is reached, so that the scale is not necessary to be cleaned; if the water quality of the water body used daily is poor, the scale formation speed in the cavity is relatively high, and even if the scale removal period is not reached, the scale formation degree is relatively serious, so that the scale removal period is not reached, and the work of the steam generator is seriously affected. Therefore, there is a need for further improvements in the scale monitoring methods.
Disclosure of Invention
The invention aims to overcome the defects in the prior art and provide a scale monitoring method for a steam generator, which has high reliability and high accuracy, is suitable for water bodies with different water qualities, and effectively ensures the daily work of the steam generator.
The purpose of the invention is realized in the following way:
a scale monitoring method of a steam generator comprises a liquid probe and a metal component for heat conduction or heating, wherein the liquid probe and the metal component are respectively connected with a control system; the method is characterized in that: the scale monitoring method applied to the steam generator comprises the following steps:
step one, determining the scale formation degree of the scale to be cleaned, reading and recording the limit resistance value R0 between the liquid probe and the metal part under the scale formation degree of the scale to be cleaned, and storing the limit resistance value on a control system;
step two, in daily use, when the steam generator is in a non-working state, the control system executes an emptying task to empty the water body in the water storage cavity, and then the control system reads and records the monitoring resistance value between the liquid probe and the metal part in the emptying state as R1;
step three, the control system calls R1 and R0 to compare; when R1 is less than or equal to R0, the control system judges that the scale reaches or exceeds the scale degree of the scale to be cleaned; when R1 is more than R0, the control system judges that the scale does not reach the scale degree of the scale to be cleaned.
The control system re-reads and records the monitoring resistance value after the steam generator is subjected to the emptying task each time.
For each read of recorded R1, the control system stores and builds a corresponding mathematical model and/or graph.
The graph is drawn by using time T1 and monitoring resistance value R1, a corresponding change line is drawn between the control system and the last R1 after each time the control system reads and records new R1, the slope theta of the change line is calculated, and when the slope theta is larger than or equal to a set delta theta, the control system prompts that the water quality of the water body is seriously reduced.
The scale monitoring method further comprises a step four;
step four, the step four is that,
when R1 is less than or equal to R0, the control system controls the steam generator not to operate and sends out a scale cleaning prompt, after the scale is cleaned for a user, the control system reads the record R1 again, determines that R1 is more than R0, and then the steam generator is put into operation again, if R1 is less than or equal to R0, the control system continues to send out the scale cleaning prompt;
when R1 > R0, the steam generator continues to operate.
In the first step, the non-operation state includes a post-state after the steam generator completes the last operation and a pre-state before the steam generator executes the next operation.
In the second step, the method for judging the water body emptying in the water storage cavity comprises the following steps: load draining method, timing draining method and flow draining method;
the steam generator applying the load emptying method comprises a drainage pump connected with a control system, wherein the drainage pump is arranged on a drainage water path communicated with the water storage cavity, and the control system monitors the load condition of the drainage pump; the load draining method comprises the following steps: step a1, a control system executes a drainage task to start a drainage pump and monitors the load condition of the drainage pump; step a2, when the drainage pump enters an idle state, the control system ends the drainage task to close the drainage pump and judges that the water in the water storage cavity is drained;
the steam generator applying the timing emptying method comprises a timing module connected with a control system, wherein the control system is provided with a drainage time T0; the timed evacuation method comprises the following steps: step b1, a control system executes a drainage task and starts a timing module; step b2, when the time reading on the timing module reaches T0, the control system ends the water draining task and judges that the water in the water storage cavity is drained;
the steam generator applying the flow emptying method comprises a flowmeter connected with a control system, and the flowmeter is arranged on a drainage path communicated with the water storage cavity; the flow evacuation method comprises the following steps: step c1, a control system executes a drainage task and monitors the water flow of a drainage waterway through a flowmeter; and c2, when the reading of the flowmeter is 0, the control system ends the water draining task and judges that the water body in the water storage cavity is drained.
The liquid probe end extends to be close to the metal part; alternatively, the liquid probe side is disposed adjacent to the metal part.
The liquid probe and/or the metal member are made of a conductive metal such as copper.
The beneficial effects of the invention are as follows:
the scale formation degree of the scale to be cleaned is determined in advance, the corresponding limiting resistance value between the liquid probe and the metal part under the scale formation degree is detected to be R0, and the limiting resistance value is stored in a control system; then before or after each operation of the steam generator, reading the monitoring resistance value R1 detected by the recording liquid probe; finally, comparing R1 with R0, and if R1 is less than or equal to R0, judging that the scale reaches or exceeds the scale degree of the scale to be cleaned, and then sending out a scale cleaning prompt; if R1 is more than R0, judging that the scale does not reach the scale formation degree of the scale to be cleaned, and continuing to put the steam generator into operation. The scale monitoring method can effectively monitor the scale formation degree based on the resistance value, and further can accurately inform a user to clean the scale. The scale monitoring method can accurately monitor the scale formation degree of the water storage cavity, has reliable performance, can adapt to different use environments, and ensures that the steam generator is stable, reliable, effective and durable. It should be noted that the scale monitoring method can be applied to other devices where scale may occur, in addition to the steam generator.
Drawings
Fig. 1 is a schematic view showing a partial structure of a steam generator according to an embodiment of the present invention.
FIG. 2 is a flow chart of a scale monitoring method according to an embodiment of the invention.
FIG. 3 is a mathematical model constructed according to the time of use and the monitored resistance value according to an embodiment of the present invention.
FIG. 4 is a graph plotting time of use and monitored resistance values according to an embodiment of the present invention.
Fig. 5 is an enlarged schematic view at α in fig. 4.
Detailed Description
The invention is further described below with reference to the drawings and examples.
Referring to fig. 1 and 5, the steam generator according to the embodiment includes a liquid probe 4, a metal part 5 for conducting heat or generating heat, and a water inlet pump 9 for injecting water and replenishing water, wherein the liquid probe 4 and the metal part 5 are respectively connected with a control system 1, when a conductive medium is arranged between the liquid probe 4 and the metal part 5, the resistance value of the conductive medium (the conductive medium in the embodiment includes water and scale, etc.) can be timely detected to the control system 1, the water inlet pump 9 is respectively controlled by the control system 1, the metal part 5 is arranged at the bottom of the water storage cavity 3 and is at least partially contacted with the water in a use state, the metal part 5 can be a part of a heating element (for heating the water to generate steam) or a part of a separately arranged part, and the water inlet pump 9 is arranged on a water inlet waterway 7 communicated with the water storage cavity 3;
the scale monitoring method for the steam generator comprises the following steps:
determining the scale formation degree of the scale to be cleaned in the empty state before leaving the factory of the steam generator, reading and recording the limit resistance value R0 between the liquid probe and the metal part 5 under the scale formation degree of the scale to be cleaned, and storing the limit resistance value on the control system 1; specifically, the scaling degree is determined according to the actual requirement of the steam generator, the structural degree and the corresponding limiting resistance value thereof can be determined through experimental data or actual use conditions, and the scaling degree is generally calculated according to the thickness of the scale;
step two, in daily use, when the steam generator is in a non-working state, the control system 1 executes an emptying task to empty the water body in the water storage cavity 3, and then the control system 1 reads and records the monitoring resistance value detected by the liquid probe 4 in the emptying state as R1; the accuracy of the reading of the monitoring resistance value can be ensured on the one hand by evacuating the water body, and on the other hand, no ponding (waste water) exists in the water storage cavity 3 and the cleanliness of steam can be ensured; under the emptying condition, if the scaling degree reaches that the scale on the liquid probe 4 is at least partially contacted with the scale on the metal part 5, the conducting medium between the liquid probe 4 and the metal part 5 is simply the scale, so that the monitoring resistance value detected in real time can be greatly reduced, namely, the greater the scaling degree is after the steam generator is used for a long time, the smaller the monitoring resistance value is, and the value R1 of the monitoring resistance value can gradually change along with the use time, so that R1 refreshed after the steam generator finishes the last work is needed, and the scaling degree is timely monitored;
step three, the control system 1 calls R1 and R0 to compare; when R1 is less than or equal to R0, the control system 1 judges that the scale reaches or exceeds the scale degree of the scale to be cleaned; when R1 > R0, the control system 1 determines that the scale has not reached the scale level where it is necessary to clean the scale.
Further, after each time the steam generator is subjected to the emptying task, the control system 1 re-reads the record monitoring resistance value R1, updates R1 in time, and grasps the scaling degree after the steam generator finishes the last work.
Further, for each reading of the recorded R1, the control system 1 stores and builds a corresponding mathematical model (see fig. 3) and graph (see fig. 4) so as to perform statistical, analytical, etc. processing on the R1 at a later stage; the graph is drawn by using time T1 and a monitoring resistance value R1, a corresponding change line is drawn between the control system 1 and the last R1 after each time the control system 1 reads and records a new R1, the slope theta of the change line is calculated, and when the slope theta is larger than or equal to a set delta theta, the control system 1 prompts that the water quality of the water body is seriously reduced. In FIG. 3, 2020-01-26 is the time when the steam generator is first operated, and the corresponding R1 is R1- (1), and θ is θ (1); 2021-02-10 is the time of thirty-fifth work, corresponding R1 is R1- (35), θ is θ (35); that is, 20XX-XX-XX is the time of the beta-th work, the corresponding R1 is R1- (beta), θ is θ (beta), and beta is a positive integer. In fig. 4, the change lines between the time points form a corresponding function curve together to more vividly reflect the change of the monitored resistance value, wherein the R1- (beta) < R0 measured at the time point T10, so the control system sends out a scale cleaning prompt; in fig. 5, the control system 1 monitors the slope θ of the change line between two adjacent time points, taking the change line HI in the graph as an example, the coordinate of the last monitoring point H is (x 1, 1), the coordinate of the next monitoring point I is (x 2, y 2), θ=arctan [ (y 2-y 1)/(x 2-x 1) ], and θ calculated in fig. 5 is larger than Δθ, that is, the scaling condition of the steam generator is relatively serious after the steam generator works for this time, the scaling condition directly reflects the poor water quality of the water body, and the control system 1 sends a corresponding prompt.
Further, the scale monitoring method further comprises a step four;
step four, the step four is that,
when R1 is less than or equal to R0, the control system 1 controls the steam generator to be not operated and sends out a scale cleaning prompt, after the scale is cleaned for a user, the control system 1 reads the record R1 again, determines that the steam generator is put into operation again after R1 is more than R0, and if R1 is less than or equal to R0, the control system 1 continues to send out the scale cleaning prompt;
when R1 > R0, the steam generator continues to operate.
Further, in the first step, the non-operation state includes a post-state after the steam generator completes the last operation and a pre-state before the steam generator executes the next operation; specifically, the evacuation task is executed in a rear state, namely, the evacuation task is executed immediately after the steam generator completes the operation task; executing the emptying task in the preposed state, namely executing the emptying task before the steam generator starts the operation task, and FIG. 3 is a mathematical model established in the preposed state; of course, the drain tasks may be performed in both the front and rear states, respectively.
Further, in the second step, the method for judging the water body emptying in the water storage cavity 3 includes: load draining method, timing draining method and flow draining method;
the steam generator of the embodiment adopts a load emptying method, wherein the steam generator comprises a drainage pump 8 connected with a control system 1, the drainage pump 8 is arranged on a drainage waterway 6 communicated with a water storage cavity 3, and the control system 1 monitors the load condition of the drainage pump 8; the load draining method comprises the following steps: step a1, the control system 1 performs a drain task to start the drain pump 8 and monitors the load condition of the drain pump 8; step a2, when the drainage pump 8 enters an idle state, the control system 1 ends the drainage task to close the drainage pump 8 and judges that the water in the water storage cavity 3 is drained;
the steam generator applying the timing emptying method comprises a timing module connected with the control system 1, wherein the control system 1 is provided with a drainage time T0, and the drainage mode can be that a drainage pump 8 is arranged to assist rapid drainage and a drainage port can be opened to drain water freely; the timed evacuation method comprises the following steps: step b1, the control system 1 executes a drainage task and starts a timing module; step b2, when the time reading on the timing module reaches T0, the control system 1 ends the water draining task and judges that the water in the water storage cavity 3 is drained;
the steam generator applying the flow emptying method comprises a flowmeter connected with the control system 1, wherein the flowmeter is arranged on a drainage waterway 6 communicated with the water storage cavity 3, and the drainage mode can be that a drainage pump 8 is arranged to assist rapid drainage and a drainage outlet can be opened to drain water freely; the flow evacuation method comprises the following steps: step c1, the control system 1 executes a drainage task, and monitors the water flow of the drainage waterway 6 through a flowmeter; and c2, when the reading of the flowmeter is 0, the control system 1 ends the water draining task and judges that the water in the water storage cavity 3 is drained.
Further, the steam generator comprises a steam outlet 2 communicated with the water storage cavity 3, the position of the steam outlet 2 is higher than the highest water level set in the water storage cavity 3, and steam generated by heating the water body is discharged through the steam outlet 2.
Further, the end of the liquid probe 4 in the present embodiment extends to be close to the metal member 5; alternatively, the side of the liquid probe 4 may be disposed close to the metal member 5.
Further, the liquid probe 4 and the metal member 5 are each made of a conductive metal such as copper.
The foregoing is a preferred embodiment of the invention showing and describing the general principles, features and advantages of the invention. It will be understood by those skilled in the art that the present invention is not limited to the foregoing embodiments, which have been described in the foregoing description merely illustrates the principles of the invention, and that various changes and modifications may be made therein without departing from the spirit and scope of the invention, which is defined in the appended claims. The scope of the invention is defined by the appended claims and equivalents thereof.
Claims (8)
1. A scale monitoring method of a steam generator, the steam generator comprises a liquid probe (4) and a metal component (5), wherein the liquid probe (4) and the metal component (5) are respectively connected with a control system (1); the method is characterized in that: the scale monitoring method applied to the steam generator comprises the following steps:
step one, determining the scale formation degree of the scale to be cleaned, reading and recording the limit resistance value R0 between the liquid probe (4) and the metal part (5) under the scale formation degree of the scale to be cleaned, and storing the limit resistance value on the control system (1);
step two, in daily use, when the steam generator is in a non-working state, the control system (1) executes an emptying task to empty the water body in the water storage cavity (3), and then the control system (1) reads and records the monitoring resistance value between the liquid probe (4) and the metal part (5) in the emptying state as R1;
step three, the control system (1) calls R1 and R0 to compare; when R1 is less than or equal to R0, the control system (1) judges that the scale reaches or exceeds the scale degree of the scale to be cleaned; when R1 is more than R0, the control system (1) judges that the scale does not reach the scale degree of the scale to be cleaned;
step four, the step four is that,
when R1 is less than or equal to R0, the control system (1) controls the steam generator not to operate and sends out a scale cleaning prompt, after the scale is cleaned by a user, the control system (1) reads the record R1 again, determines that R1 is more than R0, and then the steam generator is put into operation again, and if R1 is less than or equal to R0, the control system (1) continues to send out the scale cleaning prompt;
when R1 > R0, the steam generator continues to operate.
2. A method of scale monitoring for a steam generator according to claim 1, wherein: the control system (1) re-reads and records the monitoring resistance value after the steam generator is subjected to the emptying task each time.
3. A method of scale monitoring of a steam generator according to claim 2, wherein: for each reading of the recorded R1, the control system (1) stores and builds a corresponding mathematical model and/or graph.
4. A scale monitoring method for a steam generator according to claim 3, wherein: the graph is drawn by using time T1 and a monitoring resistance value R1, a corresponding change line is drawn between the control system (1) and the last R1 after each time the control system (1) reads and records a new R1, the slope theta of the change line is calculated, and when the slope theta is larger than or equal to a set delta theta, the control system (1) prompts that the water quality of the water body is seriously reduced.
5. A method of scale monitoring for a steam generator according to claim 1, wherein: in the first step, the non-operation state includes a post-state after the steam generator completes the last operation and a pre-state before the steam generator executes the next operation.
6. A method of scale monitoring for a steam generator according to claim 1, wherein: in the second step, the method for judging the water body emptying in the water storage cavity (3) comprises the following steps: load draining method, timing draining method and flow draining method;
the steam generator applying the load emptying method comprises a drainage pump (8) connected with a control system (1), wherein the drainage pump (8) is arranged on a drainage waterway (6) communicated with the water storage cavity (3), and the control system (1) monitors the load condition of the drainage pump (8); the load draining method comprises the following steps: step a1, the control system (1) executes a drainage task to start the drainage pump (8) and monitors the load condition of the drainage pump (8); step a2, when the drainage pump (8) enters an idle state, the control system (1) ends the drainage task to close the drainage pump (8) and judges that the water body in the water storage cavity (3) is drained;
the steam generator applying the timing emptying method comprises a timing module connected with a control system (1), wherein the control system (1) is provided with a drainage time T0; the timed evacuation method comprises the following steps: step b1, a control system (1) executes a water draining task and starts a timing module; step b2, when the time reading on the timing module reaches T0, the control system (1) finishes the drainage task and judges that the water in the water storage cavity (3) is drained;
the steam generator applying the flow emptying method comprises a flowmeter connected with the control system (1), and the flowmeter is arranged on a drainage waterway (6) communicated with the water storage cavity (3); the flow evacuation method comprises the following steps: step c1, a control system (1) executes a drainage task, and monitors the water flow of a drainage waterway (6) through a flowmeter; and c2, when the reading of the flowmeter is 0, the control system (1) ends the water draining task and judges that the water body in the water storage cavity (3) is drained.
7. A method of scale monitoring for a steam generator according to claim 1, wherein: the end of the liquid probe (4) extends to be close to the metal part (5); alternatively, the side of the liquid probe (4) is arranged close to the metal part (5).
8. A method of scale monitoring for a steam generator according to claim 1, wherein: the liquid probe (4) and/or the metal part (5) are made of copper material.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110379006.4A CN113137592B (en) | 2021-04-08 | 2021-04-08 | Scale monitoring method for steam generator |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110379006.4A CN113137592B (en) | 2021-04-08 | 2021-04-08 | Scale monitoring method for steam generator |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN113137592A CN113137592A (en) | 2021-07-20 |
| CN113137592B true CN113137592B (en) | 2023-04-25 |
Family
ID=76811496
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110379006.4A Active CN113137592B (en) | 2021-04-08 | 2021-04-08 | Scale monitoring method for steam generator |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN113137592B (en) |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP3979172B2 (en) * | 2002-05-08 | 2007-09-19 | 栗田工業株式会社 | Method and apparatus for producing pure water and scale monitor apparatus |
| JP4299701B2 (en) * | 2004-03-09 | 2009-07-22 | 株式会社サムソン | A boiler that determines whether scales are attached or not |
| CN206651720U (en) * | 2016-12-27 | 2017-11-21 | 浙江绍兴苏泊尔生活电器有限公司 | Electric kettle |
| CN108918595A (en) * | 2018-04-28 | 2018-11-30 | 芜湖美的厨卫电器制造有限公司 | A kind of water quality detecting device, storage-type electric water heater and water quality detection method |
| CN209417312U (en) * | 2019-01-29 | 2019-09-20 | 青岛新欧亚能源有限公司 | A kind of fouling detection circuit for conductive material |
| CN111649477A (en) * | 2020-04-30 | 2020-09-11 | 芜湖美的厨卫电器制造有限公司 | Water heater and water quality detection method thereof |
-
2021
- 2021-04-08 CN CN202110379006.4A patent/CN113137592B/en active Active
Also Published As
| Publication number | Publication date |
|---|---|
| CN113137592A (en) | 2021-07-20 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| KR100297415B1 (en) | Regeneration Control Method of Water Treatment System | |
| CN101498094B (en) | Foam detecting method, foam detection device and drum-type washing machine | |
| CN111896080B (en) | Calculation method and device for liquid level measurement deviation diagnosis of urea quality sensor | |
| CN113137592B (en) | Scale monitoring method for steam generator | |
| JP2021012819A (en) | Fuel cell system and control method for fuel cell system | |
| CN201266190Y (en) | Device for detecting and eliminating foam | |
| CN105091973A (en) | Device and method for detecting water level in water tank | |
| CN111759235B (en) | Control method, control device, intelligent robot and readable storage medium | |
| CN113007854A (en) | Water shortage protection method and device and humidifier | |
| CN113514501B (en) | Water body monitoring method of steam generator | |
| CN113380670A (en) | Wafer cleaning monitoring system based on Internet of things | |
| CN117345596A (en) | Efficient energy-saving circulating water utilization system | |
| CN114648861A (en) | Urea tank cleaning early warning method, device, system and medium | |
| CN111270478A (en) | Detergent feeding method and washing machine | |
| CN211609678U (en) | Dish washing machine | |
| JP3152580B2 (en) | Softening device to prevent leakage of hardness | |
| CN111521235A (en) | Electrode water level switch detection device | |
| CN211595104U (en) | Water softening installation lacks salt diagnostic device | |
| CN109545265A (en) | A kind of solid-state hard disc equipment finds weak piece of method and its system in real time | |
| CN217367901U (en) | Online chemical cleaning real-time monitoring system for membrane | |
| CN212132638U (en) | Automatic water return system of central hot water all-in-one machine | |
| CN113075548B (en) | State detection method, device, equipment and storage medium for electric hydrofoil motor | |
| CN104727102A (en) | Water inlet control method for rinsing stage of front-loading washing machine | |
| CN216260817U (en) | Intelligent diagnosis and treatment system for abnormal hydrogen conductivity | |
| CN212954880U (en) | Rotary cathode control system |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |