CN106247622B

CN106247622B - Water heater scale inhibition device and water heater

Info

Publication number: CN106247622B
Application number: CN201610872024.5A
Authority: CN
Inventors: 梁泽锋; 寿利萍; 梁国荣
Original assignee: Wuhu Midea Kitchen and Bath Appliances Manufacturing Co Ltd
Current assignee: Wuhu Midea Smart Kitchen Appliance Manufacturing Co Ltd
Priority date: 2016-09-30
Filing date: 2016-09-30
Publication date: 2022-03-18
Anticipated expiration: 2036-09-30
Also published as: CN106247622A

Abstract

The invention discloses a water heater scale inhibition device and a water heater, wherein the water heater scale inhibition device comprises: the tank body is provided with a containing cavity, and the lower end of the tank body is arranged in an open manner; the scale inhibitor releasing part is arranged at the top of the cavity; the connecting seat body is butted with the lower end of the tank body and is provided with a main channel, a water supplementing channel and a water draining channel; the main channel sequentially comprises an inlet section, a throat and a diffusion section along the water flow direction; the water replenishing channel is communicated with the inlet section and the containing cavity, and the water draining channel is communicated with the diffusion section and the containing cavity. The scale inhibition device for the water heater can play a good role in inhibiting and removing scale for the water heater.

Description

Water heater scale inhibition device and water heater

Technical Field

The invention relates to the field of water heaters, in particular to a water heater scale inhibition device and a water heater.

Background

Scale is a mixture of compounds and impurities that gradually precipitate out on the surface of a solid after the water is heated. The continuous precipitation and precipitation of supersaturated minerals in water are the main modes for forming scale, and the main components of the supersaturated minerals are CaCO3, MgCO3, CaSO4, MgSO4 and the like. The formation of scale can greatly reduce the heat exchange efficiency of the water heater, and cause the waste of resources. Meanwhile, metal corrosion can be promoted or directly caused, the service life of the product is shortened, and potential safety hazards exist.

Disclosure of Invention

The invention mainly aims to provide a scale inhibition device for a water heater, and aims to solve the technical problem that scale is easily generated in the existing water heater.

In order to achieve the above object, the present invention provides a scale inhibition device for a water heater, comprising:

the tank body is provided with a containing cavity, and the lower end of the tank body is arranged in an open manner;

the scale inhibitor releasing part is arranged at the top of the cavity;

the connecting seat body is butted with the lower end of the tank body and is provided with a main channel, a water supplementing channel and a water draining channel;

the main channel sequentially comprises an inlet section, a throat and a diffusion section along the water flow direction; the water replenishing channel is communicated with the inlet section and the containing cavity, and the water draining channel is communicated with the diffusion section and the containing cavity.

Preferably, the device also comprises a guide pipe arranged in the tank body, the lower end of the guide pipe is open and is in butt joint with the upper end of the connecting seat body, the upper end of the guide pipe is abutted against the scale inhibitor releasing part, and a plurality of drain holes are formed in the circumferential surface of the upper end of the guide pipe;

the water replenishing channel is communicated with the inner cavity of the flow guide pipe, and the water draining channel is communicated with the cavity between the flow guide pipe and the tank body.

Preferably, an annular first interface is convexly arranged on the upper end surface of the connecting base body, and the flow guide pipe is sleeved on the first interface in a sealing manner; the outlet of the water replenishing channel is positioned in the first interface, and the inlet of the water draining channel is positioned on the periphery of the first interface.

Preferably, the material of the draft tube is an elastic material, and the cross section of the draft tube is wavy; the scale inhibition device of the water heater comprises an adjusting piece for adjusting the height of the scale inhibitor releasing piece.

Preferably, the water replenishing channel comprises an upper water replenishing channel and a lower water replenishing channel, and the water draining channel comprises an upper water draining channel and a lower water draining channel;

the connection seat body comprises:

the upper end of the upper seat is butted with the lower end of the tank body, and the upper water supply channel and the upper water discharge channel are positioned in the upper seat;

the upper end of the lower seat is detachably connected with the upper seat, and the main channel, the lower water replenishing channel and the lower water draining channel are all positioned in the lower seat; wherein,

the lower water replenishing channel is communicated with the upper water replenishing channel and the inlet section, and the lower water replenishing channel is communicated with the upper water replenishing channel and the diffusion section.

Preferably, a first flange plate is formed at the lower end of the upper seat, and a second flange plate butted with the first flange plate is formed at the upper end of the lower seat;

a first sealing groove surrounding the inlet of the lower drainage channel and a second sealing groove surrounding the outlet of the lower water supply channel and the inlet of the lower drainage channel are formed in the upper end face of the second flange plate;

the water heater scale inhibition device further comprises a first sealing ring arranged in the first sealing groove and a second sealing ring arranged in the second sealing groove.

Preferably, an annular second interface is convexly arranged on the periphery of the upper end surface of the upper seat, the lower end of the tank body is embedded in the second interface, and a positioning flange abutted against the second interface is arranged on the peripheral surface of the tank body; the water heater antisludging device also comprises:

the sleeve cover comprises an annular side wall screwed on the periphery of the second connector and an annular end wall convexly arranged on the inner wall surface of the side wall, and the end wall is abutted against the upper side of the positioning flange.

Preferably, the scale inhibition device of the water heater further comprises a control valve assembly, and the control valve assembly is used for controlling the flow or opening and closing of the upper water replenishing channel and the upper drainage channel.

The control valve component comprises a valve core, a coupling part and a knob, and the coupling part is detachably connected with the valve core and the knob; the upper seat is internally provided with a valve cavity communicated with the upper water supply channel and the upper water discharge channel, and the valve cavity is arranged in an open manner so that the valve core can be arranged in the valve cavity

Preferably, the water heater scale inhibition device further comprises a nozzle piece arranged at the inlet of the drainage channel, and the aperture of the spray hole of the nozzle piece is gradually enlarged downwards.

Preferably, the connecting seat body is further provided with a pressure relief channel communicated with the containing cavity, and the water heater scale inhibition device further comprises a pressure relief valve arranged at an outlet of the pressure relief channel.

Preferably, the scale inhibitor is a polyphosphate or polycarboxylic acid scale inhibitor.

The invention also provides a water heater, which comprises a water heater scale inhibition device, wherein the water heater scale inhibition device comprises: the tank body is provided with a containing cavity, and the lower end of the tank body is arranged in an open manner; the scale inhibitor releasing part is arranged at the top of the cavity; the connecting seat body is butted with the lower end of the tank body and is provided with a main channel, a water supplementing channel and a water draining channel; the main channel sequentially comprises an inlet section, a throat and a diffusion section along the water flow direction; the water replenishing channel is communicated with the inlet section and the containing cavity, and the water draining channel is communicated with the diffusion section and the containing cavity.

According to the scale inhibition device of the water heater, water is injected into the cavity of the tank body, the scale inhibitor is released after the scale inhibitor release part is contacted with the water, the section of the main channel is reduced at the throat, the flow speed of one side of the throat, which is adjacent to the diffusion section, is high, the pressure is low, and the water dissolved with the scale inhibitor in the tank body is sucked into the diffusion section through the drainage channel; one side of the throat passage, which is adjacent to the inlet section, has low flow speed and high pressure, and water in the inlet section enters the cavity of the tank body through the water replenishing passage. The circulation is carried out, the scale inhibitor release part in the tank body is continuously dissolved, and simultaneously, the scale inhibitor solution is continuously discharged into the diffusion section, so that the scale inhibition and scale removal effects on the water heater are achieved.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the structures shown in the drawings without creative efforts.

FIG. 1 is a schematic structural diagram of an embodiment of a scale inhibition apparatus for a water heater according to the present invention;

FIG. 2 is an exploded view of the scale inhibition apparatus of the water heater of FIG. 1;

FIG. 3 is a schematic view of an exploded structure of the scale inhibition device of the water heater of FIG. 1 from another angle;

FIG. 4 is a schematic front view of the scale inhibitor for water heaters shown in FIG. 1;

FIG. 5 is a schematic cross-sectional view taken along line V-V of FIG. 4;

FIG. 6 is a schematic side view of the scale inhibition device of the water heater of FIG. 4;

FIG. 7 is a schematic cross-sectional view taken along line VII-VII of FIG. 6;

FIG. 8 is a schematic structural diagram of a water heater according to an embodiment of the present invention.

The reference numbers illustrate:

reference numerals	Name (R)	Reference numerals	Name (R)	Reference numerals	Name (R)
						1	Tank body	331	Upper drainage channel	41	Drain hole
10	Containing chamber	332	Lower drainage channel	5	Cover cap
						11	Positioning flange	34	Upper seat	51	Side wall
2	Scale inhibitor release member	341	First interface	52	End wall
						3	Connecting seat body	342	First flange plate	6	Control valve assembly
31	Main channel	343	Second interface	61	Valve core
						311	Inlet section	344	Valve cavity	62	Coupling member
312	Throat canal	345	Pressure relief channel	63	Rotary knob
						313	Diffuser segment	35	Lower seat	7	Nozzle piece
32	Water replenishing channel	351	Second flange plate	8	Pressure relief valve
						321	Upper water replenishing channel	352	First seal groove	100	Scale inhibition device of water heater
322	Lower water replenishing channel	353	Second seal groove
						33	Drainage channel	4	Flow guide pipe

The implementation, functional features and advantages of the objects of the present invention will be further explained with reference to the accompanying drawings.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

It should be noted that, if directional indications (such as up, down, left, right, front, and back … …) are involved in the embodiment of the present invention, the directional indications are only used to explain the relative positional relationship between the components, the movement situation, and the like in a specific posture (as shown in the drawing), and if the specific posture is changed, the directional indications are changed accordingly.

In addition, if there is a description of "first", "second", etc. in an embodiment of the present invention, the description of "first", "second", etc. is for descriptive purposes only and is not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In addition, technical solutions between various embodiments may be combined with each other, but must be realized by a person skilled in the art, and when the technical solutions are contradictory or cannot be realized, such a combination should not be considered to exist, and is not within the protection scope of the present invention.

The invention provides a scale inhibition device for a water heater.

In the embodiment of the present invention, as shown in fig. 1, fig. 2 and fig. 5, the scale inhibition device for a water heater includes:

the tank body 1 is provided with a containing cavity 10, and the lower end of the tank body 1 is arranged in an open manner;

the scale inhibitor releasing part 2 is arranged at the top of the cavity 10;

the connecting seat body 3 is in butt joint with the lower end of the tank body 1, and the connecting seat body 3 is provided with a main channel 31, a water supplementing channel 32 and a water drainage channel 33;

the main channel 31 comprises an inlet section 311, a throat 312 and a diffuser section 313 in sequence along the water flow direction; the water replenishing passage 32 communicates with the inlet section 311 and the chamber 10, and the water discharging passage 33 communicates with the diffuser section 313 and the chamber 10.

In this embodiment, the tank body 1 is mainly used to provide a containing space for the scale inhibitor release member 2, so that the scale inhibitor release member 2 can contact with water in the containing cavity 10 of the tank body 1 to release or dissolve the scale inhibitor. The tank body 1 is placed along the vertical direction, namely the length direction of the tank body 1 is consistent with the vertical direction, so that the flow of the water replenishing channel 32 and the flow of the water draining channel 33 can be adjusted or calculated. Specifically, the tank body 1 is cylindrical, and the top thereof may be spherical.

The scale inhibitor releasing part 2 is used for releasing or dissolving the scale inhibitor when contacting with water, therefore, the scale inhibitor releasing part 2 can be a solid scale inhibitor, such as a block-shaped scale inhibitor, or can be a container, and various forms of scale inhibitors, such as spherical particles, can be arranged in the container, or even can be liquid scale inhibitors. Preferably, the polyphosphate or polycarboxylic acid scale inhibitor requires a small amount of the two scale inhibitors and can be used for a long time.

The scale inhibitor release member 2 is arranged on the top of the cavity 10, so that the contact area of the scale inhibitor release member 2 and the water body can be controlled by controlling the height of the scale inhibitor release member 2 relative to the water surface of the cavity 10, and the dissolution speed of the scale inhibitor can be further controlled. For example, the height of the water surface can be controlled by adjusting the installation height of the scale inhibitor release member 2 or arranging the residual gas on the top of the cavity 10 and adjusting the pressure balance in the tank body 1.

The connecting seat body 3 is in butt joint with the tank body 1 to guide water into the tank body 1 and simultaneously is used for leading out the scale inhibitor solution from the tank body 1. The main channel 31 of the connecting base body 3 is connected and communicated with the water inlet pipeline of the water heater in series. To smooth the flow of water, the inlet section 311 is tapered in a direction closer to the throat 312 and the diffuser section 313 is tapered in a direction away from the throat 312.

According to the scale inhibition device for the water heater, water is injected into the containing cavity 10 of the tank body 1, the scale inhibitor is released after the scale inhibitor releasing part 2 is contacted with the water, the section of the main channel 31 is reduced at the throat 312, the flow speed of one side of the throat 312, which is adjacent to the diffusion section 313, is high, the pressure is low, and the water dissolved with the scale inhibitor in the tank body 1 is sucked into the diffusion section 313 through the drainage channel 33; the throat 312 is provided with a low flow rate and a high pressure on the side adjacent to the inlet section 311, and water in the inlet section 311 enters the cavity 10 of the tank 1 through the water replenishing channel 32. By such circulation, the scale inhibitor release part 2 in the tank body 1 is continuously dissolved, and simultaneously, the scale inhibitor solution is continuously discharged into the diffusion section 313, thereby playing the roles of scale inhibition and scale removal for the water heater.

Further, the device also comprises a flow guide pipe 4 arranged in the tank body 1, the lower end of the flow guide pipe 4 is arranged in an open manner and is butted with the upper end of the connecting seat body 3, the upper end of the flow guide pipe 4 is butted with the scale inhibitor releasing part 2, and a plurality of drain holes 41 are arranged on the circumferential surface of the upper end of the flow guide pipe 4; the water replenishing channel 32 is communicated with the inner cavity of the draft tube 4, and the water draining channel 33 is communicated with the cavity 10 between the draft tube 4 and the tank body 1.

In this embodiment, the draft tube 4 divides the cavity 10 into two parts, and the scale inhibitor release part 2 can directly dissolve the water body, i.e. the scale inhibitor is more easily saturated when dissolved, thereby reducing the dissolution speed. Meanwhile, the draft tube 4 can directly guide water to the bottom of the scale inhibitor release part 2, so that the fluidity of the water body adjacent to the scale inhibitor release part 2 is increased, the scale inhibitor release part 2 can release or dissolve the scale inhibitor in size, and the stability of the concentration of the scale inhibitor in the water body close to the inlet of the water replenishing channel 32 can be ensured.

Furthermore, in order to facilitate the disassembly and assembly of the draft tube 4, an annular first interface 341 is convexly arranged on the upper end surface of the connecting seat body 3, and the draft tube 4 is hermetically sleeved on the first interface 341; the outlet of the refill passage 32 is located in the first port 341, and the inlet of the drain passage 33 is located at the periphery of the first port 341.

In this embodiment, a buckle may be further disposed between the flow guide tube 4 and the abutting joint to prevent loosening. In addition, in order to achieve the sealing effect, a sealing ring may be further disposed at the matching surface of the flow guide tube 4 and the first interface 341.

Further, referring to fig. 7, in an embodiment, the material of the draft tube 4 is an elastic material, and the cross-sectional shape of the draft tube 4 is wavy; the scale inhibition device of the water heater comprises an adjusting member (not shown) for adjusting the height of the scale inhibitor releasing member 2.

In the embodiment, the installation height of the scale inhibitor releasing part 2 can be adjusted by compressing or stretching the draft tube 4 in the vertical direction, and the adjusting part can adopt the existing part such as a bolt and the like which can adjust the displacement. It will be appreciated that the height of the scale inhibitor release member 2 may also be adjusted by adjusting its own weight.

In addition, since the cross-sectional shape of the draft tube 4 is wavy, the draft tube 4 can alleviate the impact of the water flow and make the water flow uniformly flow out of the drain opening.

Further, referring to fig. 1 to 5, in an embodiment, the water replenishing channel 32 includes an upper water replenishing channel 321 and a lower water replenishing channel 322, and the water discharging channel 33 includes an upper water discharging channel 331 and a lower water discharging channel 332; the connection housing 3 includes:

an upper seat 34, the upper end of the upper seat 34 is butted with the lower end of the tank body 1, and an upper water replenishing channel 321 and an upper water draining channel 331 are positioned in the upper seat 34;

the upper end of the lower seat 35 is detachably connected with the upper seat 34, and the main channel 31, the lower water replenishing channel 322 and the lower water draining channel 332 are all positioned in the lower seat 35; the lower water replenishing passage 322 is connected to the upper water replenishing passage 321 and the inlet section 311, and the lower water replenishing passage 332 is connected to the upper water replenishing passage 331 and the diffuser section 313.

In this embodiment, the connection seat body 3 is provided with the upper seat 34 and the lower seat 35 which are separated, when the main channel 31 is connected in series and communicated with the water inlet pipeline of the water heater, the lower seat 35 and the water inlet pipeline can be installed first, and then the upper seat 34 is connected with the lower seat 35, so that the installation of the scale inhibition device of the water heater can be facilitated.

Further, a first flange 342 is formed at the lower end of the upper seat 34, and a second flange 351 butted with the first flange 342 is formed at the upper end of the lower seat 35;

a first seal groove 352 surrounding the inlet of the lower drainage channel 332 and a second seal groove 353 surrounding the outlet of the lower water supply channel 322 and the inlet of the lower drainage channel 332 are formed in the upper end surface of the second flange 351;

the scale inhibitor for water heater further comprises a first sealing ring (not shown) disposed in the first sealing groove 352, and a second sealing ring (not shown) disposed in the second sealing groove 353.

In this embodiment, the first flange 342 and the second flange 351 can be used to detachably connect the upper seat 34 and the lower seat 35 by using the existing fastening members. In addition, the sealing and abutting of the upper seat 34 and the lower seat 35 is relatively easy to achieve due to the large mating surfaces of the first flange 342 and the second flange 351.

Furthermore, an annular second port 343 is convexly arranged on the periphery of the upper end face of the upper seat 34, and the lower end of the tank body 1 is embedded in the second port 343; the circumferential surface of the tank 1 is provided with a positioning flange 11 abutting against the second port 343; the water heater antisludging device still includes:

the cover 5, the cover 5 includes an annular side wall 51 screwed to the periphery of the second connector 343, and an annular end wall 52 protruding from the inner wall surface of the side wall 51, and the end wall 52 abuts against the upper side of the positioning flange 11.

In this embodiment, when the can body 1 is installed, the lower end of the can body 1 may be first inserted into the second connector 343, the cover 5 is sleeved on the periphery of the second connector 343, and the can body 1 may be firmly fixed to the upper seat 34 by the screw-fit between the cover 5 and the second connector 343. The tank body 1 and the upper seat 34 are detachably fixed, so that the scale inhibitor releasing part 2 and the draft tube 4 in the tank body 1 can be replaced conveniently.

Further, referring to fig. 6 and 7, the scale inhibition device for a water heater further includes a control valve assembly 6, and the control valve assembly 6 is used for controlling the flow rate or opening and closing of the upper water supply channel 321 and the upper water supply channel 331.

In the present embodiment, specifically, the control valve assembly 6 includes a valve core 61, a coupling member 62 and a knob 63, wherein the coupling member 62 is detachably connected to the valve core 61 and the knob 63; the upper seat 34 is provided with a valve chamber 344 communicating the upper water replenishing passage 321 and the upper drainage passage 331, and the valve chamber 344 is opened to accommodate the valve element 61 therein. Of course, the control valve assembly 6 may also be an automatic solenoid valve, and the automatic control is realized in an electric control mode. The control valve assembly 6 is arranged, so that a user can conveniently control the discharge of the scale inhibitor solution according to the requirement.

Furthermore, the scale inhibition device of the water heater also comprises a nozzle piece 7 arranged at the inlet of the drainage channel 33, and the aperture of the spray hole of the nozzle piece 7 is gradually enlarged downwards. Thus, the speed of the scale inhibitor solution entering the drainage channel 33 from the containing cavity 10 of the tank body 1 can be increased, the inner wall surface of the drainage channel 33 is washed by the impact of water, and the scale inhibitor solution is prevented from forming sediment in the drainage channel 33.

Further, the connecting seat body 3 is also provided with a pressure relief channel 345 communicated with the cavity 10, and the scale inhibition device of the water heater further comprises a pressure relief valve 8 arranged at an outlet of the pressure relief channel 345.

In this embodiment, it can be understood that when the scale inhibition device of the water heater is left unused for a long time, the bottom of the cavity 10 of the tank 1 may form a precipitate, and at this time, the pressure release valve 8 may be opened to discharge the precipitate or the stain through the pressure release channel 345.

The invention further provides a water heater, please refer to fig. 1 and 8, in an embodiment, the water heater comprises a scale inhibition device of the water heater, and the specific structure of the scale inhibition device of the water heater refers to the above embodiments.

In this embodiment, the scale inhibition device of the water heater is disposed on the water inlet pipeline of the water heater, that is, the main channel 31 is connected in series to the water inlet pipeline of the water heater, and the specific connection mode may be a thread, a pipe clamp, a plug, or the like. The water heater can be a gas water heater, an electric water heater or a solar water heater and the like.

The above description is only a preferred embodiment of the present invention, and is not intended to limit the scope of the present invention, and all modifications and equivalents of the present invention, which are made by the contents of the present specification and the accompanying drawings, or directly/indirectly applied to other related technical fields, are included in the scope of the present invention.

Claims

1. A scale inhibition device for a water heater is characterized by comprising:

the scale inhibitor releasing part is arranged at the top of the containing cavity and used for releasing a scale inhibitor;

the main channel sequentially comprises an inlet section, a throat and a diffusion section along the water flow direction; the water replenishing channel is communicated with the inlet section and the containing cavity, and the water draining channel is communicated with the diffusion section and the containing cavity;

the inlet section is arranged along the direction close to the throat in a gradually-reducing mode, and the diffusion section is arranged along the direction far away from the throat in a gradually-increasing mode.

2. The scale inhibition device for the water heater as claimed in claim 1, further comprising a flow guide pipe arranged in the tank body,

the lower end of the flow guide pipe is open and is butted with the upper end of the connecting seat body, the upper end of the flow guide pipe is butted with the scale inhibitor releasing part, and a plurality of drain holes are formed in the peripheral surface of the upper end of the flow guide pipe;

3. The scale inhibition device for the water heater as claimed in claim 2, wherein an annular first interface is convexly arranged on the upper end surface of the connecting seat body, and the draft tube is hermetically sleeved on the first interface; the outlet of the water replenishing channel is positioned in the first interface, and the inlet of the water draining channel is positioned on the periphery of the first interface.

4. The scale inhibition device for the water heater as claimed in claim 2 or 3, wherein the material of the draft tube is an elastic material, and the cross section of the draft tube is wavy; the scale inhibition device of the water heater comprises an adjusting piece for adjusting the height of the scale inhibitor releasing piece.

5. The scale inhibition device for the water heater as claimed in claim 1, wherein the water replenishing channel comprises an upper water replenishing channel and a lower water replenishing channel, and the water draining channel comprises an upper water draining channel and a lower water draining channel;

the connection seat body comprises:

6. The scale inhibition device for the water heater as claimed in claim 5, wherein a first flange is formed at the lower end of the upper seat, and a second flange butted with the first flange is formed at the upper end of the lower seat;

7. The scale inhibition device for the water heater as claimed in claim 6, wherein an annular second interface is convexly arranged on the periphery of the upper end surface of the upper seat;

the lower end of the tank body is embedded in the second interface, and the peripheral surface of the tank body is provided with a positioning flange abutted against the second interface;

the water heater antisludging device also comprises:

8. The scale inhibition device for the water heater as claimed in claim 5, further comprising a control valve assembly for controlling the flow rate or opening and closing of the upper water replenishing channel and the upper water discharging channel.

9. The scale inhibition device for the water heater as claimed in claim 1 or 5, further comprising a nozzle member arranged at the inlet of the drainage channel, wherein the aperture of the spray hole of the nozzle member is gradually enlarged downwards.

10. The scale inhibition device for the water heater as claimed in claim 1 or 5, wherein the connecting seat body is further provided with a pressure relief channel communicated with the cavity, and the scale inhibition device for the water heater further comprises a pressure relief valve arranged at an outlet of the pressure relief channel.

11. The scale inhibitor for water heaters as claimed in claim 1, wherein the scale inhibitor is polyphosphate or polycarboxylic acid scale inhibitor.

12. A water heater comprising the scale inhibition device for a water heater as claimed in any one of claims 1 to 11.