CN209863392U - Liquid heating equipment and hot water system thereof - Google Patents
Liquid heating equipment and hot water system thereof Download PDFInfo
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- CN209863392U CN209863392U CN201920237631.3U CN201920237631U CN209863392U CN 209863392 U CN209863392 U CN 209863392U CN 201920237631 U CN201920237631 U CN 201920237631U CN 209863392 U CN209863392 U CN 209863392U
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Abstract
Compared with the prior art, the water heating system can clear away scale in the heat exchanger within the first time by arranging the special cleaning module, thereby not only improving the use experience of users, but also reducing the maintenance cost; on the other hand, the circulating pipeline and the water pump arranged in the cleaning module enable the cleaning liquid to repeatedly wash away water scales in the heat exchanger, so that the cleaning efficiency is improved, the cleaning effect is enhanced, a large amount of cleaning liquid is saved, and the maintenance cost of the hot water system is further reduced. Additionally, the utility model also provides an adopted above-mentioned hot water system's liquid heating equipment, have simple structure, the dependable performance, use and experience good, maintenance cost low grade advantage.
Description
Technical Field
The utility model relates to a water treatment technical field especially relates to a liquid heating equipment and hot water system thereof.
Background
The existing water purifier is generally provided with a heating module, such as a hot tank, an instant heating type heater and the like, which can heat purified water so as to meet the daily requirements of users. However, under the condition of long-time high-temperature heating, calcium and magnesium ions in water can be converted into water scales and adhere to a heating area of the heating module, so that the heating time of the heating module is prolonged, the energy loss is increased, and even the heating module is burnt out in severe cases, so that timely removal of the water scales is the key for ensuring normal operation of the heating module and the water purifier.
However, the existing water purifier in the market is not provided with a special scale removal module, so that a user cannot remove hidden dangers for scales generated in the heating module at the first time, and can only carry out treatment by after-sale maintenance or replacement of the heating module, thereby not only influencing the use experience of the user, but also improving the maintenance cost of the water purifier.
SUMMERY OF THE UTILITY MODEL
In order to solve the technical problem, the utility model provides a liquid heating equipment and hot water system thereof, this hot water system are equipped with special cleaning module, can clear away the incrustation scale in the heating module the very first time, have the advantage such as effectual, the maintenance cost is low of heating.
Based on this, the utility model provides a hot-water heating system includes:
the heating module comprises a water inlet pipeline, a water outlet pipeline and a heat exchanger, the water inlet pipeline is communicated with a water inlet of the heat exchanger, a first valve for controlling the on-off of the water inlet pipeline is arranged on the water inlet pipeline, the water outlet pipeline is communicated with a water outlet of the heat exchanger, and a second valve for controlling the on-off of the water outlet pipeline is arranged on the water outlet pipeline;
the cleaning module comprises a cleaning pipeline, a circulating pipeline, a sewage draining pipeline and a water pump, wherein the cleaning pipeline is communicated with a water inlet of the heat exchanger, the cleaning pipeline is provided with a third valve for controlling the on-off state of the cleaning pipeline, the circulating pipeline is communicated with a water inlet and a water outlet of the heat exchanger, the circulating pipeline is provided with a fourth valve for controlling the on-off state of the circulating pipeline, the sewage draining pipeline is communicated with the circulating pipeline, the sewage draining pipeline is provided with a fifth valve for controlling the on-off state of the sewage draining pipeline, and the water pump is arranged on the circulating pipeline.
Preferably, one end of the circulation pipeline is connected with the water inlet pipeline, the connection position of the circulation pipeline and the water inlet pipeline is marked as a first node, and the first node is located between the water inlet of the heat exchanger and the first valve.
Preferably, the other end of the circulating pipeline is connected with the water outlet pipeline, the connection position of the circulating pipeline and the water outlet pipeline is marked as a second node, and the second node is located between the water outlet of the heat exchanger and the second valve.
Preferably, one end of the cleaning pipeline is connected with the circulation pipeline, the connection position of the cleaning pipeline and the circulation pipeline is marked as a third node, and the third node is located between the second node and the fourth valve.
Preferably, the fourth valve is disposed between the water pump and the first node.
Preferably, one end of the sewage draining pipeline is connected with the circulating pipeline, the connection position of the circulating pipeline and the sewage draining pipeline is marked as a fourth node, and the fourth node is positioned between the water pump and the fourth valve.
Preferably, the cleaning module further comprises a cleaning liquid tank, and the cleaning pipeline is connected and communicated with the cleaning liquid tank.
Preferably, the heat exchanger is a hot tank, a tankless heater or a steam heater.
Another object of the present invention is to provide a liquid heating apparatus, including the above-mentioned hot water system.
Implement the embodiment of the utility model provides a, following beneficial effect has:
the utility model provides a hot water system includes heating module and cleaning module, heating module includes the water intake pipe, outlet pipe way and heat exchanger, the water intake pipe is linked together with heat exchanger's water inlet, and be equipped with first valve on the water intake pipe, outlet pipe way is linked together with heat exchanger's delivery port, and be equipped with the second valve on the outlet pipe way, cleaning module is including wasing the pipeline, the circulation pipeline, blowdown pipeline and water pump, it is linked together with heat exchanger's water inlet to wash the pipeline, and be equipped with the third valve on the washing pipeline, the circulation pipeline is linked together with heat exchanger's water inlet and delivery port simultaneously, and be equipped with the fourth valve on the circulation pipeline, the blowdown pipeline communicates with the circulation pipeline mutually, and be equipped with the fifth valve that is used for controlling its break-make on the. Based on the structure, the water heating system is provided with the special cleaning module, so that on one hand, water scale in the heat exchanger can be removed in the first time, the use experience of a user is improved, and meanwhile, the maintenance cost is reduced; on the other hand, the circulating pipeline and the water pump arranged in the cleaning module enable the cleaning liquid to repeatedly wash away water scales in the heat exchanger, so that the cleaning efficiency is improved, the cleaning effect is enhanced, a large amount of cleaning liquid is saved, and the maintenance cost of the hot water system is further reduced.
Additionally, the utility model also provides a liquid heating equipment, because it has adopted foretell hot water system, therefore have simple structure, the dependable performance, use and experience good, maintenance cost low grade advantage.
Drawings
Fig. 1 is a schematic view of a hot water system according to an embodiment of the present invention in a normal heating state;
fig. 2 is a schematic view of a hot water system according to an embodiment of the present invention in a circulation cleaning state;
FIG. 3 is a schematic view of a hot water system according to an embodiment of the present invention in a flushing blowdown mode;
fig. 4 is a schematic structural diagram of a cleaning device according to an embodiment of the present invention;
fig. 5 is a schematic diagram of the relationship between the temperature and the scale dissolution rate of the embodiment of the present invention.
Description of reference numerals:
100. heating module, 101, water inlet pipe, 102, water outlet pipe, 103, heat exchanger, 104, first valve, 105, second valve, 106, first node, 107, second node, 200, cleaning module, 201, cleaning pipe, 202, circulation pipe, 203, blowdown pipe, 204, water pump, 205, third valve, 206, fourth valve, 207, fifth valve, 208, third node, 209, fourth node, 210, cleaning solution tank, 211, first interface, 212, second interface, 213, third interface, 300, monitoring module, 301, controller, 302, first temperature sensor, 303, second temperature sensor, 304, power sensor.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by a person of ordinary skill in the art without creative efforts belong to the protection scope of the present invention.
As shown in fig. 1, an embodiment of the present invention provides a liquid heating apparatus, which is internally provided with a hot water system, and the hot water system mainly includes a heating module 100 and a cleaning module 200. Specifically, the heating module 100 comprises a water inlet pipeline 101, a water outlet pipeline 102 and a heat exchanger 103, wherein the water inlet pipeline 101 is communicated with a water inlet of the heat exchanger 103, and the water inlet pipeline 101 is provided with a first valve 104 for controlling the on-off state of the water inlet pipeline 101; the water outlet pipeline 102 is communicated with the water outlet of the heat exchanger 103, and a second valve 105 for controlling the on-off of the water outlet pipeline 102 is arranged on the water outlet pipeline. The cleaning module 200 comprises a cleaning pipeline 201, a circulating pipeline 202, a sewage draining pipeline 203 and a water pump 204, wherein the cleaning pipeline 201 is communicated with a water inlet of the heat exchanger 103, a third valve 205 for controlling the on-off of the cleaning pipeline 201 is arranged on the cleaning pipeline 201, the circulating pipeline 202 is communicated with the water inlet and the water outlet of the heat exchanger 103 at the same time, a fourth valve 206 for controlling the on-off of the circulating pipeline 202 is arranged on the circulating pipeline 202, the sewage draining pipeline 203 is communicated with the circulating pipeline 202, a fifth valve 207 for controlling the on-off of the sewage draining pipeline 203 is arranged on the sewage draining pipeline 203, and the water pump. In the embodiment of the present invention, the heat exchanger 103 is preferably a hot tank, an instant heater, or a steam heater.
Based on the structure, the water heating system can remove water scales in the heat exchanger 103 in the first time by arranging the special cleaning module 200, so that the use experience of a user is improved, and meanwhile, the maintenance cost is reduced; on the other hand, the circulation pipeline 202 and the water pump 204 arranged in the cleaning module 200 enable the cleaning liquid to repeatedly wash away the scale in the heat exchanger 103, so that the cleaning efficiency is improved, the cleaning effect is enhanced, a large amount of cleaning liquid is saved, and the maintenance cost of the hot water system is further reduced.
Specifically, as shown in fig. 1, one end of the circulation line 202 is connected to the water inlet line 101, and the connection position of the two is denoted as a first node 106, where the first node 106 is located between the water inlet of the heat exchanger 103 and the first valve 104; the other end of the circulation line 202 is connected to the water outlet line 102, and the connection position of the two is marked as a second node 107, and the second node 107 is located between the water outlet of the heat exchanger 103 and the second valve 105. One end of the cleaning pipeline 201 is connected with the circulating pipeline 202, the connection position of the cleaning pipeline and the circulating pipeline is marked as a third node 208, the third node 208 is positioned between the second node 107 and the fourth valve 206, and the fourth valve 206 is arranged between the water pump 204 and the first node 106; one end of the drain line 203 is connected to the circulation line 202, and the connection position of the drain line and the circulation line is denoted as a fourth node 209, and the fourth node 209 is located between the water pump 204 and the fourth valve 206.
Based on this, the embodiment of the present invention provides a hot water system having the following three operating states:
in a normal heating state, as shown in fig. 1, the first valve 104 and the second valve 105 are opened, the third valve 205, the fourth valve 206 and the fifth valve 207 are closed, the water pump 204 is not operated, and normal-temperature water enters the heat exchanger 103 through the water inlet pipeline 101, is heated by the heat exchanger 103 into hot water, and then flows out through the water outlet pipeline 102;
in a circulating cleaning state, as shown in fig. 2, the first valve 104, the second valve 105 and the fifth valve 207 are closed, the third valve 205 and the fourth valve 206 are opened, the water pump 204 is operated, the cleaning solution enters the heat exchanger 103 through the cleaning pipeline 201, the cleaning solution enters the circulating pipeline 202 after cleaning the heat exchanger 103, and then enters the heat exchanger 103 again through the circulating pipeline 202, so that circulating cleaning is realized;
in the flushing and blowdown state, as shown in fig. 3, the second valve 105, the third valve 205 and the fourth valve 206 are closed, the first valve 104 and the fifth valve 207 are opened, the water pump 204 is operated, and normal temperature water enters the heat exchanger 103 through the water inlet pipe 101 to flush the cleaning solution remaining in the heat exchanger 103 and the circulation pipe 202, and is finally discharged through the blowdown pipe 203.
Further, as shown in fig. 1, in order to make the hot water system provided by the embodiment of the present invention have a higher degree of automation, the cleaning module 200 further includes a cleaning solution tank 210, and the cleaning pipeline 201 is connected and communicated with the cleaning solution tank 210. Therefore, when scale removal is needed, the hot water system can directly enter a circulating cleaning state without accessing cleaning liquid to the cleaning pipeline 201 from the outside, so that the workload of a user is reduced, and convenience is provided for automatic control of the hot water system.
Still further, as shown in fig. 4, in order to improve the practicability and reduce the manufacturing cost, the cleaning module 200 of the present embodiment may be designed as a separate integrated type cleaning apparatus, that is, the cleaning line 201, the circulation line 202, the sewage line 203, the water pump 204, the third valve 205, the fourth valve 206, the fifth valve 207 and the cleaning solution tank 210 are integrated into a single housing or stand, and, both ends of the circulation pipeline 202 are respectively provided with a first interface 211 and a second interface 212, which are respectively used for connecting a water inlet and a water outlet of a cleaning object (such as the heat exchanger 103 in the embodiment), one end of the sewage discharge pipeline 203 far away from the fourth node 209 is provided with a third interface 213, which is used to discharge the cleaning liquid remaining in the cleaning object, and furthermore, in order to prevent the cleaning liquid in the cleaning line 201 from flowing back into the cleaning liquid tank 210, the cleaning liquid tank 210 is located at the highest position of the integrated cleaning apparatus; to facilitate the discharge of the remaining cleaning solution, the third port 213 is located at the lowest position of the integrated cleaning apparatus. Based on the structure, the integrated cleaning device can be flexibly applied to a hot water system of the liquid heating equipment and used for cleaning and descaling the heating module 100, so that the structure of the whole liquid heating equipment is simplified, the maintenance difficulty is reduced, and the maintenance cost is reduced.
Furthermore, as shown in fig. 1, the hot water system provided by the embodiment of the present invention further includes a monitoring module 300, the monitoring module 300 includes a controller 301, a first temperature sensor 302, a second temperature sensor 303, and a power sensor 304, the controller 301 is electrically connected to the first valve 104, the second valve 105, the third valve 205, the fourth valve 206, the fifth valve 207, the water pump 204, and the heat exchanger 103, and is used for controlling the valves, the water pump 204, and the heat exchanger 103; meanwhile, the controller 301 is further electrically connected to a first temperature sensor 302, a second temperature sensor 303 and a power sensor 304, wherein the first temperature sensor 302 is used for monitoring the temperature of the inlet water of the heat exchanger 103, the second temperature sensor 303 is used for monitoring the temperature of the outlet water of the heat exchanger 103, and the power sensor 304 is used for monitoring the power of the heat exchanger 103.
Preferably, in practical applications, the skilled person derives, based on working experience and a large amount of experimental data, that there is a certain relation between the temperature of the cleaning liquid and the dissolution rate of the scale: as can be seen from fig. 5, the scale dissolution rate is in an increasing trend with the increase of the water temperature. Based on this, in the circulation cleaning state, the heat exchanger 103 is in an open state for heating the cleaning liquid. In addition, as can be seen from fig. 5, when the water temperature is in the range of 45 ℃ to 65 ℃, the scale dissolution rate reaches a stable value, although the scale dissolution rate can be increased by continuously increasing the temperature, the increase of the temperature increases the energy consumption, which is not beneficial to environmental protection, and the further increase of the temperature has a limit to the increase of the scale dissolution rate, so that the temperature of 45 ℃ to 65 ℃ is the most preferable working condition in the circulating cleaning state.
Next, an embodiment of the present invention provides a method for cleaning the above-mentioned hot water system, including the following steps:
closing the first valve 104, the second valve 105 and the fifth valve 207, opening the third valve 205 and the fourth valve 206, starting the water pump 204, and enabling the hot water system to enter a circulating cleaning state;
closing the second valve 105, the third valve 205 and the fourth valve 206, opening the first valve 104 and the fifth valve 207, keeping the water pump 204 running, and enabling the hot water system to enter a flushing sewage discharge state;
the first valve 104 and the second valve 105 are opened, the third valve 205, the fourth valve 206 and the fifth valve 207 are closed, the water pump 204 is stopped, and the hot water system enters a normal heating state.
Based on the above cleaning method, the embodiment of the present invention provides a hot water system having a timing cleaning mode, that is, the controller 301 cleans the heat exchanger 103 according to the cleaning time axis, specifically:
calculating a cleaning time axis comprising a plurality of actual cleaning time points according to preset initial time, cleaning interval days and cleaning time;
starting timing along the cleaning time axis by using a time program built in the controller 301;
when the system time reaches the next cleaning time point on the cleaning time axis, the hot water system is switched from the normal heating state to the circulating cleaning state;
after the circulating cleaning state is finished, the hot water system is switched to a flushing and pollution discharging state;
and after the flushing and sewage discharging state is finished, the hot water system is switched to a normal heating state, and timing is continued along the cleaning time axis.
Further, on the basis of the above-mentioned timing cleaning mode, the embodiment of the present invention provides a hot water system further having an intelligent cleaning mode, that is, the controller 301 determines whether the heat exchanger 103 needs to be descaled based on the collected parameters of the first temperature sensor 302 (for monitoring the water inlet temperature of the heat exchanger 103), the second temperature sensor 303 (for monitoring the water outlet temperature of the heat exchanger 103) and the power sensor 304 (for monitoring the power of the heat exchanger 103), and then combines with the built-in calculation program of the controller 301, and if the descaling is not needed, then the normal timing is continued; and if the descaling is needed, recalculating the cleaning time axis, and taking the cleaning time of the day or the next day as the next actual cleaning time point.
In the intelligent cleaning mode, whether the heat exchanger 103 needs to be descaled or not is determined according to the following three determination rules:
first-first, according to the actual inlet water temperature t of the heat exchanger1And preset water outlet temperature t2Calculating to obtain the theoretical heating time T of the heat exchanger1Combining the deviation coefficient k to obtain the normal heating time T2(ii) a Monitoring the actual outlet water temperature of the heat exchanger, and when the actual outlet water temperature reaches t2The actual heating time T of the heat exchanger is obtained by timing3And will T3And T2Comparing; if T3Greater than T2Judging that the heat exchanger is scaled and needs to be descaled; if T3Less than or equal to T2Then it is determined that the heat exchanger is low or not fouled and no descaling is required.
Second, first according to the actual inlet water temperature t of the heat exchanger1And preset water outlet temperature t2Calculating to obtain the theoretical heating time T of the heat exchanger1Combining the deviation coefficient k to obtain the normal heating time T2(ii) a Timing the actual heating time of the heat exchanger when the actual heating time reaches T2Then, the actual outlet water temperature t of the heat exchanger is acquired3And will t3And t2Comparing; if t3Less than t2Judging that the heat exchanger is scaled and needs to be descaled; if t3Is greater than or equal to t2Then it is determined that the heat exchanger is low or not fouled and no descaling is required.
Third-first according to the actual inlet water temperature t of the heat exchanger1And preSetting the temperature t of the effluent2And calculating to obtain the temperature t of the outlet water of the heat exchanger2Theoretical heating power W of1(ii) a Then the actual outlet water temperature of the heat exchanger is monitored, and when the actual outlet water temperature reaches t2Then, the actual heating power W of the heat exchanger is acquired2And W is2And W1Comparing; if W2Greater than W1Judging that the heat exchanger is scaled and needs to be descaled; if W2Is less than or equal to W1Then it is determined that the heat exchanger is low or not fouled and no descaling is required.
In order to make the timing cleaning mode and the intelligent cleaning mode more popular and easy to understand, a specific example is given below for further detailed description.
The preset starting time is generally the current time, for example, 13:00 of 1019-1-1 day, the preset cleaning interval days is 10 days (optionally 0-999 days), and the preset cleaning time is 12:00(24 hours), so that the controller 301 calculates a cleaning time axis composed of a plurality of actual cleaning time points:
12:00 on days 1019-1-11,
12:00 on days 1019-1-21,
12:00 on days 1019-1-31,
……
after the cleaning time axis is confirmed, a built-in control timing program of the controller 301 immediately starts timing, when the system time reaches 12:00 of 1019-1-11 days, the controller 301 immediately controls the hot water system to enter a circulating cleaning state, after the system time is finished, the controller 301 controls the hot water system to enter a flushing and pollution discharging state, and finally returns to a normal heating state.
Meanwhile, the controller 301 also monitors the degree of fouling of the heat exchanger 103 in real time to determine whether the fouling needs to be removed:
if the controller 301 obtains that the heat exchanger 103 does not need descaling according to the three judgment rules, normal timing is continued until the system time reaches 12:00 of 1019-1-21 days, the controller 301 controls the hot water system to enter a circulating cleaning state again, and so on, and the controller 301 cleans the heat exchanger 103 according to a cleaning time axis;
if the controller 301 determines that the heat exchanger 103 needs to be descaled according to the three judgment rules at 9:00 of days 1019-1-15, the controller 301 takes 12:00 of days 1019-1-15 as the next actual cleaning time point, that is, when the system time reaches 12:00 of days 1019-1-15, the controller 301 immediately controls the hot water system to enter the circulating cleaning state. Moreover, the controller 301 recalculates a new cleansing timeline:
12:00 on day 1019-1-15,
12:00 on days 1019-1-25,
12:00 on day 1019-2-04,
……
finally, it should be pointed out that the liquid heating apparatus provided by the embodiment of the present invention can be a water purifier, a water heater, a coffee machine, etc.
To sum up, the embodiment of the present invention provides a liquid heating apparatus and a hot water system thereof, and compared with the prior art, the hot water system is provided with a special cleaning module 200, which can remove the scale in the heating module 100 in the first time, and has the advantages of good heating effect, low maintenance cost, etc.; for the liquid heating device, the hot water system and the cleaning module 200 are adopted, so that the liquid heating device has the advantages of simple structure, reliable performance, good use experience, low maintenance cost and the like.
Additionally, the embodiment of the utility model provides a still provide a cleaning method of above-mentioned hot-water heating system, have advantages such as easy operation, practicality height.
It should be understood that the terms "first", "second", etc. are used herein to describe various information, but the information should not be limited to these terms, and these terms are only used to distinguish one type of information from another. For example, "first" information may also be referred to as "second" information, and similarly, "second" information may also be referred to as "first" information, without departing from the scope of the present invention.
The foregoing is a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, a plurality of modifications and variations can be made without departing from the principle of the present invention, and these modifications and variations are also considered as the protection scope of the present invention.
Claims (9)
1. A hot water system, comprising:
the heating module comprises a water inlet pipeline, a water outlet pipeline and a heat exchanger, the water inlet pipeline is communicated with a water inlet of the heat exchanger, a first valve for controlling the on-off of the water inlet pipeline is arranged on the water inlet pipeline, the water outlet pipeline is communicated with a water outlet of the heat exchanger, and a second valve for controlling the on-off of the water outlet pipeline is arranged on the water outlet pipeline;
the cleaning module comprises a cleaning pipeline, a circulating pipeline, a sewage draining pipeline and a water pump, wherein the cleaning pipeline is communicated with a water inlet of the heat exchanger, the cleaning pipeline is provided with a third valve for controlling the on-off state of the cleaning pipeline, the circulating pipeline is communicated with a water inlet and a water outlet of the heat exchanger, the circulating pipeline is provided with a fourth valve for controlling the on-off state of the circulating pipeline, the sewage draining pipeline is communicated with the circulating pipeline, the sewage draining pipeline is provided with a fifth valve for controlling the on-off state of the sewage draining pipeline, and the water pump is arranged on the circulating pipeline.
2. The water heating system according to claim 1, wherein one end of the circulation line is connected to the water inlet line at a position denoted as a first node between the water inlet of the heat exchanger and the first valve.
3. The water heating system according to claim 2, wherein the other end of the circulation line is connected to the water outlet line at a position identified as a second node between the water outlet of the heat exchanger and the second valve.
4. The water heating system according to claim 3, wherein one end of the purge line is connected to the circulation line at a position denoted as a third node between the second node and the fourth valve.
5. The water heating system according to claim 2, wherein the fourth valve is disposed between the water pump and the first node.
6. The water heating system according to claim 5, wherein one end of the sewage draining pipeline is connected with the circulating pipeline, and the connection position of the sewage draining pipeline and the circulating pipeline is taken as a fourth node, and the fourth node is positioned between the water pump and the fourth valve.
7. The water heating system according to claim 1, wherein the cleaning module further comprises a cleaning solution tank, the cleaning line being connected to and in communication with the cleaning solution tank.
8. The water heating system according to claim 1, wherein the heat exchanger is a hot tank, a tankless heater, or a steam heater.
9. Liquid heating apparatus, characterised in that it comprises a hot water system according to any one of claims 1-8.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201920237631.3U CN209863392U (en) | 2019-02-25 | 2019-02-25 | Liquid heating equipment and hot water system thereof |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920237631.3U CN209863392U (en) | 2019-02-25 | 2019-02-25 | Liquid heating equipment and hot water system thereof |
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| CN209863392U true CN209863392U (en) | 2019-12-31 |
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| CN201920237631.3U Active CN209863392U (en) | 2019-02-25 | 2019-02-25 | Liquid heating equipment and hot water system thereof |
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