CN204730446U - Water heater - Google Patents

Abstract

The utility model discloses a kind of water heater, comprising: inner bag, be limited with chamber in described inner bag, described inner bag is provided with the sewage draining exit with described chamber conducting, and described sewage draining exit place is provided with blowoff valve; Apparatus for eliminating sludge, described apparatus for eliminating sludge comprises: for holding the liquid storage container of scale remover; Liquid feeding pump, described liquid feeding pump is communicated with described liquid storage container; Feed tube, one end of described feed tube is communicated with described liquid feeding pump, and the other end of described feed tube stretches into described chamber through described inner bag.According to water heater of the present utility model, scale remover solution can be injected in chamber under the drive of liquid feeding pump, makes the incrustation scale in chamber be dissolved by scale remover and to disperse, and discharges from sewage draining exit, and the elimination effect of incrustation scale improves.

Description

water heater

technical field

The utility model relates to the technical field of hot water equipment, in particular to a water heater.

Background technique

The water heater is a closed structure consisting of an inner tank, a heating system and an auxiliary system. During daily use, the hardness of tap water is high due to the high concentration of metal ions such as calcium and magnesium in tap water. In the inner tank of the water heater, due to the uneven heating and heating, the tap water is easy to form scale in the inner tank. Some of these scales are suspended in the inner tank water, some are adhered to the inner tank wall, and some are dropped and blocked. Nozzle, some will be attached to the heating tube. Among them, most of the scale generated in the inner tank will adhere to the heating tube, and the scale attached to the heating tube will fall off irregularly, and the scale that falls can be large or small, and the largest diameter can reach 2-3cm , the small diameter is so small that it is almost indistinguishable.

The scale dropped in the liner will form a dissolution balance in the water, and the impurities, heavy metals and other substances wrapped in the scale will slowly dissolve. Scale will also provide attachment points for thermophilic bacteria present in the liner, which is conducive to the growth and reproduction of bacteria. The scale existing in the inner tank will deteriorate the water quality in the inner tank, and may cause harm to the user during the bathing process of the user.

The harm of scale to water heaters and to users is obvious to all. At present, most water heaters on the market are not equipped with drain valves, which cannot discharge the scale in the inner tank in a timely and convenient manner. When sewage needs to be discharged, the after-sales service personnel will remove the magnesium rod of the water heater, and the sewage outlet removed from the magnesium rod will discharge all the water in the inner tank, and the scale in the inner tank will be discharged from the sewage outlet, which can be discharged with the water flow Most of the scale is the scale deposited at the bottom of the inner tank, which does not have a good discharge effect on the scale attached to the inner tank wall and the scale on the heating pipe.

In addition, in some related technologies, a drain valve (or drain valve) is installed at the bottom of the water heater, and the water flow during the draining process is used to flush out the small pieces of scale falling from the bottom of the inner tank, so as to achieve the purpose of scale removal. . However, due to the limitation of the caliber of the drain valve, the scale in the inner tank cannot be drained well, and the scale removal effect is poor.

When the water in the inner tank is discharged from the drain valve, the scale that can be discharged from the inner tank with the water flow is mainly the scale located above or around the drain valve, and the scale at the bottom of the inner tank is very small and can be suspended in the water. of scale. Since the inner tank is a relatively sealed structure, if no other measures or operations are taken, the water flow in the inner tank will be relatively slow, and the force of the water flow flowing in the direction of the drain valve will be weak, which will make the scale located far away from the drain outlet 1. The scale attached to the wall of the inner tank or the scale with larger particles at the bottom cannot be washed out by the water flow or rushed to the periphery of the drain valve to discharge the inner tank.

Therefore, there are not many scales discharged using this method or technology. In actual operation, the scale efficiency of cleaning the inner tank (or sewage discharge) by this method or technology is relatively low, sometimes even lower than 30%.

Utility model content

The utility model aims to solve one of the technical problems in the related art at least to a certain extent. For this reason, the utility model proposes a water heater, and the descaling effect of the water heater is improved.

The water heater according to the utility model includes: an inner tank, a chamber is defined in the inner tank, a sewage outlet connected to the chamber is provided in the inner tank, and a sewage valve is provided at the sewage outlet; Scale device, described descaling device comprises: be used to hold the liquid storage container of descaling agent; Liquid inlet pump, described liquid inlet pump is communicated with described liquid storage container; Liquid inlet pipe, one end of described liquid inlet pipe is connected with The liquid inlet pump is connected, and the other end of the liquid inlet pipe passes through the inner bag and extends into the chamber.

According to the water heater of the utility model, the descaling agent solution can be sprayed into the chamber under the drive of the liquid inlet pump, so that the scale in the chamber can be dissolved and dispersed by the descaling agent, and the part of the scale located far away from the sewage outlet, The scale attached to the inner wall of the liner or the scale with larger particles at the bottom can also be washed out by the water flow and discharged from the sewage outlet, and the scale removal effect is improved.

In addition, the water heater according to the utility model can also have the following additional technical features:

Optionally, the water heater further includes a nozzle, and the nozzle is arranged on one end of the liquid inlet pipe extending into the inner tank.

Optionally, the water heater further includes a magnesium rod, the magnesium rod is connected with the drain valve and is located in the chamber, the drain valve is detachably connected with the inner tank, and the liquid inlet pipe is connected to the drain valve. After the valve is disassembled, it extends from the drain port into the chamber.

Optionally, the water heater further includes a magnesium rod, the magnesium rod is connected with the drain valve and is located in the chamber, the hollow magnesium rod is formed as a part of the liquid inlet pipe, and the nozzle is arranged in the on a magnesium rod.

Optionally, a one-way valve is provided inside the magnesium rod.

Optionally, the nozzle can spray 360 degrees or rotate around the axis of the liquid inlet pipe.

Optionally, the liquid inlet pump is formed as a self-priming pump.

Optionally, one end of the liquid inlet pipe protruding into the inner container is disposed adjacent to and facing the top wall of the inner container.

Optionally, the descaling device further includes: a sewage interface pipe, the liquid inlet pipe is connected to the sewage interface pipe and protrudes from one end of the sewage interface pipe, and the other end of the sewage interface pipe is open, One end of the sewage interface pipe is sealed and connected with the sewage outlet.

Optionally, the water heater further includes a sewage collection container, the sewage collection container is connected to the other end of the sewage discharge interface pipe, and the liquid inlet pipe extends into the sewage discharge interface pipe from the side wall of the sewage discharge interface pipe.

Additional aspects and advantages of the invention will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention.

Description of drawings

Fig. 1 is a schematic structural view of a water heater according to an embodiment of the present invention, wherein no descaling device is assembled;

Fig. 2 is a structural schematic diagram of a water heater according to an embodiment of the present invention after being equipped with a descaling device.

Reference signs:

water heater 100;

Inner tank 10; chamber 101; sewage outlet 102;

Liquid inlet pump 21; liquid inlet 211; liquid outlet 212; liquid inlet pipe 22; nozzle 23; sewage interface pipe 24;

Magnesium Rod 30;

Drain valve 40;

Heating tube 50.

Detailed ways

Embodiments of the present invention are described in detail below, examples of which are shown in the drawings, wherein the same or similar reference numerals represent the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by referring to the figures are exemplary and are intended to explain the present invention, but should not be construed as limiting the present invention.

The water heater 100 according to the embodiment of the present utility model will be described in detail below with reference to the accompanying drawings.

Referring to Fig. 1 and Fig. 2, a water heater 100 according to an embodiment of the present utility model includes an inner tank 10 and a descaling device. A chamber 101 is defined inside the liner 10 , and the liner 10 is provided with a sewage outlet 102 communicating with the chamber 101 , and the sewage outlet 102 is provided with a sewage valve 40 . The blowdown valve 40 can open or close the blowdown port 102 . Under normal conditions, the blowdown valve 40 is closed. The descaling device includes a liquid storage container (not shown in the figure) for containing the descaling agent, a liquid inlet pump 21 and a liquid inlet pipe 22 . The liquid inlet pump 21 communicates with the liquid storage container. One end of the liquid inlet pipe 22 communicates with the liquid inlet pump 21 , and the other end of the liquid inlet pipe 22 passes through the inner bag 10 and extends into the chamber 101 .

The descaling agent in the liquid storage container can enter into the chamber 101 driven by the liquid inlet pump 21, and dissolve and remove the scale in the chamber 101, thereby improving the descaling effect. Wherein, due to the presence of the liquid inlet pump 21 , the descaling agent can flow into the inner tank 10 at a relatively high speed. Thus, the force of the water flow flowing toward the sewage outlet 102 becomes stronger, so that the scale located far away from the sewage outlet 102, the scale attached to the inner wall of the inner container 10, or the scale with larger particles at the bottom of the inner container 10 can also be washed away by the water flow. Go out or rush to the periphery of the sewage outlet 102 to discharge the inner tank 10, and the effect of removing scale is improved.

Wherein, when the pressure of the liquid inlet pump 21 is relatively high, the descaling agent can be sprayed at the end of the liquid inlet pipe 22 extending into the chamber 101, so that the descaling agent can be sprayed to the inner wall of the liner and the heating pipe 50 In addition, the spraying area of the descaling agent is larger, and more scales are dissolved and removed. At the same time, the strength of the water flow is further strengthened, and the scales at the bottom of the inner tank 10 can be washed out more thoroughly.

According to the water heater 100 of the embodiment of the present invention, by setting the descaling device, the descaling agent solution can be sprayed into the chamber 101 under the drive of the liquid inlet pump 21, so that the part of the scale located far away from the sewage outlet 102, the interior The scale attached to the inner wall of the tank 10 or the scale with larger particles at the bottom of the inner tank 10 can be dissolved and dispersed, and discharged from the sewage outlet 102, and the scale removal effect is improved.

The utility model is an improvement aimed at common water heaters. Of course, the descaling agent can also be injected into the inner tank in other ways, and the descaling effect can also be achieved in theory. However, the removal effect of scale in the inner tank is not ideal by soaking or common water intake (non-spraying). If you use soaking, you need to use a lot of descaling agent. If you use less descaling agent, the descaling effect will be poor due to the low concentration of descaling agent; if you use a lot of descaling agent, it will damage the inner tank The magnesium rods in the water will be damaged, which will affect the normal use of the water heater. Therefore, preferably, in the utility model, the descaling agent is injected into the inner container 10 by spraying.

Specifically, the descaling device further includes a nozzle 23 which is arranged on one end of the liquid inlet pipe 22 extending into the inner tank 10 . Thus, the descaling agent can be injected into the chamber 101 in a jetting manner, even when the working pressure of the liquid inlet pump 21 is relatively low. On the one hand, the descaling agent can contact and react with the scales on the inner wall of the inner tank 10, the heating pipe 50 and the bottom of the inner tank 10, dissolve and disperse these scales, and reduce the particle size of large scale scales. And make it peel off from inner liner 10. On the other hand, the descaling agent sprayed by the nozzle 23 can form a strong water flow in the inner tank 10, which has a strong impact on the scale in the inner tank 10, and can wash the scale out of the inner tank 10, thereby achieving descaling and cleaning the water heater. 100 purposes, the descaling effect is significantly improved.

In order to further improve the descaling effect, optionally, according to some embodiments of the present invention, the nozzle 23 can spray 360 degrees around the axis of the liquid inlet pipe 22 or rotate it. Specifically, the nozzle 23 can have two structures. The nozzle 23 of one structure can spray towards an angle. At this time, when the nozzle 23 rotates around the axis of the liquid inlet pipe 22, the nozzle 23 can form a 360-degree rotating spray. Another structure of the nozzle 23 itself has a spray angle of 360 degrees, that is, the nozzle 23 can spray 360 degrees along the axis of the liquid inlet pipe 22 when it is at rest. Both of these two spraying methods can make the inside of the liner 10 get relatively comprehensive spraying, and the descaling effect is good.

Preferably, one end of the liquid inlet pipe 22 protruding into the inner container 10 is disposed adjacent to and facing the top wall of the inner container 10 . As a result, the sprayable area of the descaling agent is larger, and the scale removal effect is further improved.

It can be understood that the descaling device can be used as an after-sales service tool by the after-sales personnel to serve the user, or it can be directly installed on the water heater 100 as a descaling component for the user to use for descaling operation. For example, as shown in FIG. 2 , the descaling device can be used as an after-sales accessory, and after-sales personnel come to serve users.

As shown in FIG. 1 , the water heater 100 further includes a magnesium rod 30 , which is connected to the drain valve 40 and located in the inner tank 10 , and the magnesium rod 30 can reduce the generation of scale. The drain valve 40 is detachably connected with the inner tank 10 . Since the magnesium rod 30 is connected with the drain valve 40 , when the drain valve 40 is disassembled from the inner tank 10 , the magnesium rod 30 will also be disassembled from the inner tank 10 along with the drain valve 40 . The liquid inlet pipe 22 can extend into the chamber 101 from the drain outlet 102 after the drain valve 40 is disassembled.

Wherein, in order to facilitate connection, the descaling device also includes a sewage interface pipe 24, the liquid inlet pipe 22 is connected with the sewage interface pipe 24 and stretches out from one end of the sewage interface pipe 24, the other end of the sewage interface pipe 24 is open, and the sewage interface pipe 24 One end is connected to the sewage outlet 102 in a sealed manner. Thus, when the sewage interface pipe 24 is connected to the sewage outlet 102, the liquid inlet pipe 22 and the nozzle 23 can be stretched into the chamber 101, and the liquid inlet pipe 22 and the nozzle 23 will be fixed with the sewage interface pipe 24 and the inner container 10. It can be fixed and easy to assemble. Wherein, the sewage interface pipe 24 can be connected with the sewage outlet 102 by buckle, screw thread, flange or riveting to achieve a sealed connection.

As shown in FIG. 2 , the liquid inlet pipe 22 can extend from the side wall of the sewage interface pipe 24 into the sewage interface pipe 24 . Thus, the other end of the sewage interface pipe 24 can be completely opened, so that the scale can be discharged more smoothly. In order to prevent the sewage with scale from flowing everywhere, optionally, the water heater 100 further includes a sewage collection container, which is connected to the other end of the sewage outlet pipe so that the sewage with scale can be collected.

1 and 2, when using the descaling device for descaling, first remove the drain valve 40 on the water heater 100, and take the magnesium rod 30 out of the water heater 100 to make all the water in the inner tank 10 Drain, part of the scale in the inner tank 10 will be discharged with the water flow; then the sewage outlet pipe 24 of the descaling device is sealed with the sewage outlet 102, and the liquid inlet pipe 22 and the nozzle 23 can be extended into the chamber 101 and fixed.

Then, the liquid inlet 211 of the liquid inlet pump 21 is communicated with the water storage equipment, the liquid outlet 212 of the liquid inlet pump 21 is communicated with the liquid inlet pipe 22, after the liquid inlet pump 21 is opened, the descaling agent aqueous solution can be obtained from the liquid inlet The nozzle 23 of the tube 22 sprays into the chamber 101 . Wherein, for the convenience of connection, the liquid storage container can be connected with the liquid inlet pump 21 by using a hose. Specifically, one end of the hose is submerged below the liquid level of the descaling agent aqueous solution in the liquid storage container, and the other end is connected to the liquid inlet 211 . In addition, the scale collection container and the sewage interface pipe 24 may also be connected by a hose. Specifically, one end of the hose is connected to the sewage interface pipe 24 , and the other end is connected to the scale collecting container to receive the scale flowing out of the inner tank 10 .

Liquid storage containers can be of various types. For example, the liquid storage container may be a specially equipped container or an existing bucket or other water storage container at the user's home. Tap water can be added to the liquid storage container, and then a certain amount of descaling agent can be added and stirred until it is completely dissolved to form an aqueous solution of descaling agent. The sewage collection container can also be an existing bucket or other water containers in the user's home. Wherein, the liquid storage container and the scale collecting device can be one piece, so that the descaling agent can be recycled.

After the connection of the descaling device is completed, the power supply of the liquid inlet pump 21 can be turned on to start the operation of the liquid inlet pump 21 . Under the operation of the liquid inlet pump 21 , the descaling agent aqueous solution is pumped into the liquid inlet pipe 22 and sprayed out of the inner tank 10 through the nozzle 23 , as shown by the solid arrow in FIG. 2 . Wherein, the nozzle 23 can rotate 360 degrees to spray in the form of a water column, and can also spray 360 degrees in an all-round way.

The sprayed descaling agent aqueous solution will contact and react with the scale attached to the inner wall of the inner container 10 and the heating tube 50, dissolve, disperse, and peel off these scales, and these attached scales will be washed into the interior by the descaling agent aqueous solution The bottom of the tank 10, together with the scale at the bottom of the inner tank 10, is carried by the aqueous solution of the descaling agent to be discharged from the sewage outlet 102, as shown by the dotted arrow in FIG. 2 . The aqueous solution of the descaling agent flushes out the scale and flows from the hose connected to the sewage outlet 102 to the scale collection container, so that the sewage can be collected. With the operation of the liquid inlet pump 21 , the descaling agent aqueous solution can be continuously sprayed into the inner tank 10 and discharged from the sewage outlet 102 . A good descaling effect can be achieved after running for a period of time.

When the descaling device is in use, it can be circulated and fully reacted. After a period of circulation, the descaling agent aqueous solution can be replaced with tap water to clean the descaling device and the inner tank 10, so that the inner tank 10 and the descaling device The descaling agent remaining in the container is flushed out to avoid affecting the performance of the descaling device and the inner tank 10 and the use of the user. During cleaning, the scale will be further washed out to achieve the purpose of descaling and cleaning the inner tank 10.

Specifically, the liquid storage container and the scale collection device are the same part. After the descaling device has been in operation for a period of time, the aqueous solution of the descaling agent in the liquid storage container can be poured out together with the scale washed out, and then the water in the liquid storage container Add a certain amount of tap water, the liquid inlet pump 21 continues to run, and the tap water will flush the descaling device and the inner container 10, and all the remaining descaling agent components will be washed out of the inner container 10, so as to avoid affecting the descaling device and the inner container 10. performance and normal use by users.

The liquid inlet pump 21 preferably uses a self-priming pump with a self-priming function, wherein the water flow range can be 3L/min-20L/min. Since the descaling agent is a kind of weak acid substance that can chemically react with scale, the pH value of its aqueous solution is generally less than 4. If it comes into contact with metal during use, it will have a certain corrosion effect on the metal. In order to avoid the corrosion effect of the descaling agent aqueous solution on the descaling device, the descaling device can use polypropylene, modified polyphenylene ether (acid-resistant), polycarbonate, polytetrafluoroethylene, polyphenylene sulfide or ABS resin, etc. Weak acid-resistant plastics are used as preparation materials to increase the performance and service life of the descaling unit.

In other embodiments of the present utility model, the descaling device is installed on the water heater 100 when it leaves the factory. When descaling is required, there is no need to install an additional descaling device, which makes descaling more convenient for users. Specifically, the magnesium rod 30 is connected with the blowdown valve 40 and is located in the chamber 101 , the magnesium rod 30 is hollowly formed as a part of the liquid inlet pipe 22 , and the nozzle 23 is arranged on the magnesium rod 30 . The descaling agent in the liquid storage container can be sprayed out from the nozzle 23 through the magnesium rod 30 under the action of the liquid inlet pump 21, and when the sewage valve 40 is opened, the scale can be discharged from the sewage outlet 104, thereby realizing the decontamination of the water heater 100. dirt.

Wherein, a one-way valve may be provided in the magnesium rod 30 to prevent the water in the inner tank 10 from flowing out from the hollow magnesium rod 30 . In addition, the installation position of the magnesium rod 30 can be appropriately increased to prevent the aqueous solution of descaling agent sprayed from the nozzle 23 from soaking into the magnesium rod 30 and thereby damaging the magnesium rod 30. Although the above technical description is not marked in the patent drawings, it is useful for those in the art. It is understandable to those of ordinary skill.

The water heater 100 according to the embodiment of the present utility model is convenient for after-sales personnel or users to operate, and can effectively remove scale inside the water heater 100 . Through the spraying of the descaling agent aqueous solution by the nozzle 23, the descaling agent aqueous solution can be sprayed onto the inner wall of the inner container 10 and the heating pipe 50, and react with the scale on the inner wall of the inner container 10 and the heating pipe 50, so that these scales are removed. Dissolve and peel off and fall to the bottom of the inner tank 10; at the same time, the use of the nozzle 23 can also form a strong water flow, forming a greater impact on the scale deposited at the bottom of the inner tank 10, and the scale at the bottom can be washed out of the inner tank 10 to achieve ideal The descaling effect improves the user's bathing water environment.

Other configurations and operations of the water heater 100 according to the embodiment of the present utility model are known to those skilled in the art, and will not be described in detail here.

In describing the present invention, it should be understood that the terms "center", "upper", "lower", "front", "rear", "top", "bottom", "inner", "outer", The orientation or positional relationship indicated by "axial" is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the utility model and simplifying the description, rather than indicating or implying that the referred device or element must have a specific Orientation, construction and operation in a particular orientation, therefore should not be construed as limiting the invention.

In addition, the terms "first" and "second" are used for descriptive purposes only, and cannot be interpreted as indicating or implying relative importance or implicitly specifying the quantity of indicated technical features. Thus, a feature defined as "first" and "second" may explicitly or implicitly include one or more of these features. In the description of the present utility model, "plurality" means two or more, unless otherwise specifically defined.

In the present invention, unless otherwise clearly specified and limited, the first feature may be in direct contact with the first feature or the first feature and the second feature through an intermediary indirect contact. Moreover, "above", "above" and "above" the first feature on the second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. "Below", "beneath" and "beneath" the first feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is less horizontally than the second feature.

In this utility model, unless otherwise specified and limited, terms such as "installation", "connection", "connection" and "fixation" should be understood in a broad sense, for example, it can be a fixed connection or a detachable connection. Connection, or integration; it can be mechanical connection or electrical connection; it can be direct connection or indirect connection through an intermediary, and it can be the internal communication of two components or the interaction relationship between two components. Those of ordinary skill in the art can understand the specific meanings of the above terms in the present utility model according to specific situations.

In the description of this specification, descriptions referring to the terms "one embodiment", "some embodiments", "example", "specific examples", or "some examples" mean that specific features described in connection with the embodiment or example , structures, materials or features are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms are not necessarily directed to the same embodiment or example. Furthermore, the described specific features, structures, materials or characteristics may be combined in any suitable manner in any one or more embodiments or examples. In addition, those skilled in the art can combine and combine different embodiments or examples and features of different embodiments or examples described in this specification without conflicting with each other.

Although the embodiments of the present invention have been shown and described above, it can be understood that the above-mentioned embodiments are exemplary and should not be construed as limitations of the present invention, and those skilled in the art are within the scope of the present invention. Variations, modifications, substitutions and variations can be made to the above-described embodiments.

Claims (10)

1. A water heater, characterized in that, comprising: An inner tank, the inner tank is defined with a chamber, the inner tank is provided with a drain outlet connected to the chamber, and the drain outlet is provided with a drain valve; Descaling device, described descaling device comprises: A reservoir for containing the descaling agent; a liquid inlet pump, the liquid inlet pump communicates with the liquid storage container; A liquid inlet pipe, one end of the liquid inlet pipe communicates with the liquid inlet pump, and the other end of the liquid inlet pipe passes through the inner bag and extends into the chamber. 2. The water heater according to claim 1, further comprising a nozzle, the nozzle being arranged on one end of the liquid inlet pipe extending into the inner tank. 3. The water heater according to claim 2, characterized in that it further comprises a magnesium rod, the magnesium rod is connected with the drain valve and is located in the chamber, and the drain valve is detachably connected with the inner tank , the liquid inlet pipe extends from the drain outlet into the chamber after the drain valve is disassembled. 4. The water heater according to claim 2, further comprising a magnesium rod, the magnesium rod is connected to the drain valve and located in the chamber, and the hollow magnesium rod is formed as the liquid inlet pipe A part of the nozzle is set on the magnesium rod. 5. The water heater according to claim 4, characterized in that a one-way valve is arranged inside the magnesium rod. 6 . The water heater according to claim 2 , wherein the nozzle can spray 360 degrees around the axis of the liquid inlet pipe or rotate it. 7 . 7. The water heater according to claim 1, wherein the liquid inlet pump is formed as a self-priming pump. 8. The water heater according to any one of claims 1-7, characterized in that, one end of the liquid inlet pipe protruding into the inner tank is arranged adjacent to and facing the top wall of the inner tank. 9. The water heater according to claim 3, characterized in that, the descaling device further comprises: a sewage outlet pipe, the liquid inlet pipe is connected with the sewage outlet pipe and protrudes from one end of the sewage discharge interface pipe , the other end of the sewage interface pipe is open, and one end of the sewage interface pipe is sealed and connected with the sewage outlet. 10. The water heater according to claim 9, further comprising a sewage collection container, the sewage collection container is connected to the other end of the sewage discharge interface pipe, and the liquid inlet pipe connects to the side of the sewage discharge interface pipe. The wall extends into the sewage interface pipe.