Water tank device and water treatment apparatus

Abstract

The application relates to the technical field of water treatment equipment, and relates to a water tank device and water treatment equipment. The water tank device comprises a tank body and a backflow pipe; the tank body is internally provided with a containing cavity; the backflow pipe is arranged in the tank body, and the end portion of the backflow pipe is suspended in the containing cavity, wherein the distance between the backflow pipe and the bottom of the containing cavity is smaller than the inner diameter of the backflow pipe. In the water tank device, the end portion of the backflow pipe is suspended in the containing cavity, and the distance between the backflow pipe and the bottom of the containing cavity is smaller than the inner diameter of the backflow pipe. The structural design makes the backflow pipe outlet close to the bottom of the tank body, and in combination with the inner diameter size, the contact section between the backwater and the bottom of the tank body is effectively increased, the local flow rate of the backflow water is reduced, and the low-temperature backflow water is beneficial to stable deposition at the bottom of the tank body.

Description

Technical Field

[0001] This application relates to the field of water treatment equipment technology, and in particular to a water tank device and water treatment equipment. Background Technology

[0002] Existing water tank systems typically include a tank for storing liquid and a return pipe structure for liquid circulation. The return pipe usually runs inside the tank and is used to reintroduce the cooled liquid from the outside into the tank for reuse. This type of structure is widely used in hot water systems, heat exchange equipment, and energy storage devices, and its basic function is to maintain the flow and temperature control of the liquid within the system.

[0003] However, in traditional designs, the outlet of the return pipe is typically located far from the bottom of the tank, and there is a lack of proper matching between the pipe's placement and its inner diameter. When low-temperature return water is discharged from the return pipe, the excessively high outlet position causes the water flow to directly impact the upper part of the tank's hot water zone, resulting in violent mixing of hot and cold water. This causes a rapid drop in the overall water temperature within the tank, severely impacting the effective storage and utilization efficiency of hot water. Furthermore, due to the small return cross-section or excessively high flow velocity, the return water struggles to settle stably at the bottom, further exacerbating the mixing phenomenon. Utility Model Content

[0004] In view of this, this application provides a water tank device and a water treatment equipment to solve the problem that in traditional water tank devices, the temperature of hot water changes significantly during return flow because the port of the return pipe is far from the bottom of the tank.

[0005] The first aspect of this application provides a water tank device, comprising: The box has an internal cavity; and A return pipe is inserted into the housing, with its end suspended within the receiving cavity. The distance between the return pipe and the bottom of the receiving cavity is less than the inner diameter of the return pipe.

[0006] In one possible implementation, the inner diameter of the reflux tube is 8-10 mm; and / or, the distance between the reflux tube and the bottom of the receiving cavity is 2-6 mm.

[0007] In one possible implementation, the housing further includes a raised structure located at the bottom of the receiving cavity, and the orthographic projection of the return pipe onto the bottom of the receiving cavity at least partially overlaps with the raised structure.

[0008] In one possible implementation, the protruding structure has a guide slope on the side facing the return pipe, the edge of the guide slope is connected to the bottom of the receiving cavity, and the guide slope is used to guide the water flow output from the return pipe to the bottom of the receiving cavity.

[0009] In one possible implementation, the water tank device further includes a heating element that extends through the tank body and is at least partially suspended within the receiving cavity, the heating element being used to heat the heat exchange medium within the receiving cavity.

[0010] In one possible implementation, the heating element includes a connecting section and a surrounding section, with the two connecting sections respectively connected to opposite ends of the surrounding section, the surrounding section having at least a partially arc-shaped orthographic projection on the bottom of the receiving cavity, and the return pipe located within the surrounding section.

[0011] In one possible implementation, the distance between the surrounding segment and the top of the receiving cavity is greater than the distance between the surrounding segment and the bottom of the receiving cavity.

[0012] In one possible implementation, the inner diameter of the return pipe is d, the distance between the return pipe and the bottom of the receiving cavity is d, the return water cross section of the return pipe inside the receiving cavity is A, and the following relationship is satisfied: π×d×s≥A; And / or, the return flow rate of the return pipe is V, the return water cross section of the return pipe inside the receiving cavity is A, and the following relationship is satisfied: V / A<0.5m / s.

[0013] A second aspect of this application provides a water treatment device, comprising: Heat exchange components for outputting hot water; and The water tank device as described in any of the above, wherein the water tank device is thermally coupled to the heat exchange component.

[0014] In one possible implementation, the heat exchange assembly includes a heat exchange element and an instant heating element, the water tank device is thermally coupled to the heat exchange element, and the heat exchange element is used to heat the water flow, the instant heating element is connected to the output end of the heat exchange element and is used to heat the water flow output by the heat exchange element.

[0015] Implementing the embodiments of this application has the following beneficial effects: In the water tank device of this embodiment, the end of the return pipe is suspended inside the receiving cavity, and the distance between the return pipe and the bottom of the receiving cavity is less than the inner diameter of the return pipe. This structural design makes the outlet of the return pipe close to the bottom of the tank, and combined with its inner diameter, it effectively increases the contact cross-section between the return water and the bottom of the tank, reduces the local flow velocity of the return water, and is conducive to the stable deposition of low-temperature return water at the bottom of the tank.

[0016] In the water tank device of this embodiment, since the return water can settle fully at the bottom, it avoids directly impacting the upper and middle hot water areas, thereby significantly reducing the heat exchange mixing phenomenon between hot and cold water, and improving the stratification effect of hot water storage and the efficiency of heat energy utilization. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 A perspective view of the water treatment equipment in an embodiment of this utility model is shown; Figure 2 A schematic diagram of the internal structure of the water treatment equipment in an embodiment of this utility model is shown; Figure 3 A perspective view of the water tank device in an embodiment of the present invention is shown; Figure 4 A schematic diagram of the internal structure of the water tank device in an embodiment of this utility model is shown.

[0019] Figure label: 1. Water treatment equipment; 10. Water tank device; 100. Box body; 110. Receiving cavity; 120. Protruding structure; 121. Flow guide slope; 200. Return pipe; 300. Heating element; 310. Connecting section; 320. Circulating section; 20. Heat exchange assembly; 201. Heat exchange element; 202. Instantaneous heating element; 30. Water channel structure; 40. Shell. Detailed Implementation

[0020] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0021] Existing water tank systems typically include a tank for storing liquid and a return pipe structure for liquid circulation. The return pipe usually runs inside the tank and is used to reintroduce the cooled liquid from the outside into the tank for reuse. This type of structure is widely used in hot water systems, heat exchange equipment, and energy storage devices, and its basic function is to maintain the flow and temperature control of the liquid within the system.

[0022] However, in traditional designs, the outlet of the return pipe is typically located far from the bottom of the tank, and there is a lack of proper matching between the pipe's placement and its inner diameter. When low-temperature return water is discharged from the return pipe, the excessively high outlet position causes the water flow to directly impact the upper part of the tank's hot water zone, resulting in violent mixing of hot and cold water. This causes a rapid drop in the overall water temperature within the tank, severely impacting the effective storage and utilization efficiency of hot water. Furthermore, due to the small return cross-section or excessively high flow velocity, the return water struggles to settle stably at the bottom, further exacerbating the mixing phenomenon.

[0023] Based on this, see Figures 1 to 4 As shown, this utility model embodiment provides a water tank device 10, which includes a tank body 100 and a return pipe 200; the tank body 100 has a receiving cavity 110 inside; the return pipe 200 passes through the tank body 100, and the end of the return pipe 200 is suspended in the receiving cavity 110, wherein the distance between the return pipe 200 and the bottom of the receiving cavity 110 is less than the inner diameter of the return pipe 200.

[0024] In the water tank device 10 of this embodiment, the end of the return pipe 200 is suspended inside the receiving cavity 110, and the distance between the return pipe 200 and the bottom of the receiving cavity 110 is less than the inner diameter of the return pipe 200. This structural design makes the outlet of the return pipe 200 close to the bottom of the tank body 100. Combined with its inner diameter, it effectively increases the contact cross-section between the return water and the bottom of the tank body 100, reduces the local flow velocity of the return water, and is conducive to the stable deposition of low-temperature return water at the bottom of the tank body 100.

[0025] In the water tank device 10 of this embodiment, since the return water can settle sufficiently at the bottom, it avoids directly impacting the upper and middle hot water areas, thereby significantly reducing the heat exchange mixing phenomenon between hot and cold water, and improving the stratification effect of hot water storage and the efficiency of heat energy utilization.

[0026] In the water tank device 10 of this embodiment, since the return water can settle sufficiently at the bottom, it avoids directly impacting the upper and middle hot water areas, thereby significantly reducing the heat exchange mixing phenomenon between hot and cold water and improving the stratification effect and thermal energy utilization efficiency of hot water storage. Furthermore, the return pipe 200 can adopt a straight pipe structure, and its outlet end can be horizontal, slightly inclined downwards, or have a flared structure to further guide the water flow to adhere to the bottom of the tank 100. For example, the outlet end of the return pipe 200 can be set in a funnel shape, with a flaring angle of 10°, 15°, or 20° to increase the water flow diffusion area, reduce local flow velocity, and enhance the bottom sedimentation effect. In addition, the return pipe 200 can be made of corrosion-resistant and high-temperature-resistant metal materials or engineering plastics, such as stainless steel, copper alloy, or polypropylene, to adapt to the usage requirements under different working conditions.

[0027] Furthermore, the number of return pipes 200 can be one, two, or more, and there is no single limitation. When multiple return pipes 200 are installed, each return pipe 200 can be evenly distributed circumferentially or axially along the bottom of the tank 100 to achieve uniform distribution of return water in the bottom area and avoid disturbance caused by concentrated water flow in local areas. The coordinated arrangement of multiple return pipes 200 can further improve the stability of temperature stratification, which is especially suitable for large-capacity water tanks or high-flow circulation systems. In addition, the bottom of the tank 100 can be designed as a flat, arc-shaped, or conical structure to match the arrangement of the return pipes 200, guiding the low-temperature return water to naturally converge at the lowest point, reducing flow resistance and promoting stratification.

[0028] In summary, this utility model effectively solves the problem of hot and cold water mixing caused by improper return position in traditional water tank devices by reasonably limiting the relationship between the distance between the outlet end of the return pipe 200 and the bottom of the tank 100 and its inner diameter, combined with structural optimization and material selection, thereby improving the thermal energy storage efficiency and system operation stability.

[0029] Specifically, the inner diameter of the return pipe 200 is 8-10mm. This size range is set by comprehensively considering the balance between fluid return efficiency and structural space layout. It should be noted that the inner diameter of the return pipe 200 can be 8mm, 8.5mm, 9mm, 9.5mm, or 10mm, depending on the actual design requirements, and is not limited here. When the inner diameter of the return pipe 200 is less than 8mm, the cross-sectional area of ​​the flow channel decreases, which may lead to an increase in return resistance, affecting the flow velocity of the lubricating or cooling medium, and thus reducing the heat exchange efficiency or lubrication effect of the system. When the inner diameter is greater than 10mm, although the flow resistance is further reduced, it will occupy more internal space, which may interfere with other structural components, while increasing material costs and overall volume, which is not conducive to the compact design of the equipment.

[0030] The distance between the return pipe 200 and the bottom of the receiving cavity 110 is 2-6 mm. This distance is designed to ensure that the inlet of the return pipe 200 can effectively avoid areas where deposited impurities or air bubbles accumulate, while also preventing the inlet from being blocked due to excessive proximity. Specifically, this distance can be 2 mm, 2.5 mm, 4 mm, 5 mm, or 6 mm, and the actual value can be adjusted according to the flow characteristics of the medium in the receiving cavity 110, the settling velocity of impurities, and the installation orientation of the equipment. If the distance is less than 2 mm, the inlet of the return pipe 200 may be too close to the bottom, easily causing pipeline blockage or wear on the pumping system; if the distance is greater than 6 mm, the inlet position may be too high, preventing effective return when the medium level is low, thus affecting the system's circulation stability.

[0031] In one embodiment, the inner diameter of the reflux pipe 200 is 8.5 mm, and the distance between the reflux pipe 200 and the bottom of the receiving cavity 110 is 2.5 mm. This specific parameter combination ensures sufficient flow cross-sectional area while effectively controlling the space occupied by the reflux pipe 200, and positions its inlet above the impurity settling layer and within the mainstream medium region, which is conducive to achieving stable and clean medium reflux.

[0032] Furthermore, the housing 100 also includes a protrusion structure 120, which is disposed at the bottom of the receiving cavity 110, and the orthographic projection of the return pipe 200 on the bottom of the receiving cavity 110 at least partially overlaps with the protrusion structure 120.

[0033] By designing the protruding structure 120 to cooperate with the return pipe 200, the inlet failure caused by the port of the return pipe 200 being in direct contact with the bottom of the receiving cavity 110 can be avoided. Specifically, when the port of the return pipe 200 is directly attached to the bottom of the receiving cavity 110, factors such as bottom deposits, liquid surface tension, or local negative pressure can easily prevent liquid from being transported from the return pipe 200 to the receiving cavity 110, thus affecting the return efficiency or even causing the return to be interrupted. The protruding structure 120 creates a certain gap between the port of the return pipe 200 and the bottom of the receiving cavity 110, which is conducive to smooth liquid output and improves the reliability of the return.

[0034] In a preferred embodiment, the end of the return pipe 200 is spaced apart from the protrusion structure 120. This spacing can be adjusted according to actual operating conditions; for example, it can be 1mm, 2mm, 3mm, 5mm, or 8mm, specifically determined based on factors such as the viscosity and flow rate of the return liquid, and the size of any impurity particles that may exist within the receiving cavity 110. No single limitation is made here. If the spacing is too small, there may still be a risk of blockage; if the spacing is too large, it may weaken the supporting or positioning effect of the protrusion structure 120 on the end of the return pipe 200, and may also increase the ineffective volume, affecting the overall structural compactness.

[0035] The specific structural form of the protrusion structure 120 can be varied. For example, the protrusion structure 120 can be a columnar boss, an annular flange, a polygonal protrusion, or an irregularly shaped raised structure. Its cross-sectional shape can be circular, square, elliptical, or other shapes adapted to the end profile of the return pipe 200. The protrusion structure 120 can be integrally formed with the housing 100, or it can be fixed to the bottom of the receiving cavity 110 by welding, bonding, or fastener connection. When the protrusion structure 120 and the housing 100 are integrally formed using the same material, the structural strength can be improved and the assembly process can be reduced; when it is set as a separate unit, it is convenient to replace or maintain the protrusion structure 120 in parts.

[0036] Furthermore, the number of protruding structures 120 can be one, two, or more, and there is no single limitation. When multiple protruding structures 120 are provided, they can be circumferentially distributed around the end of the return pipe 200 to provide more stable support or guidance, while further preventing the port of the return pipe 200 from sticking to the bottom due to local settlement or deformation. Multiple protruding structures 120 can also form a flow channel, guiding the liquid to converge towards the port of the return pipe 200, improving the return efficiency. The height of the protruding structure 120 can also be adjusted as needed, for example, its height can be 2mm, 4mm, 6mm, 10mm, etc., specifically determined according to the depth of the receiving cavity 110 and the installation position of the return pipe 200. If the height of the protruding structure 120 is too low, it will be difficult to effectively prevent the port of the return pipe 200 from sticking to the bottom; if it is too high, it may affect the arrangement of other components inside the housing 100 or cause liquid flow turbulence. Therefore, the height of the protruding structure 120 needs to be optimized while ensuring functional implementation.

[0037] In one embodiment, the protruding structure 120 has a guide slope 121 on the side facing the return pipe 200. The edge of the guide slope 121 is connected to the bottom of the receiving cavity 110, and the guide slope 121 is used to guide the water flow output from the return pipe 200 to the bottom of the receiving cavity 110.

[0038] By setting the guide slope 121, the raised structure 120 can easily guide the hot water output from the return pipe 200 to the bottom of the receiving cavity 110, avoiding the water flow from directly impacting the side wall of the receiving cavity 110 or forming turbulent eddies in the cavity, thereby improving the flow stability of the water flow in the receiving cavity 110.

[0039] The specific structure of the guide slope 121 can be a planar slope, an arc-shaped surface, or composed of multiple continuously transitioning micro-slopes. Its inclination angle can be adjusted according to the water outlet direction of the return pipe 200, the water flow velocity, and the internal spatial layout of the receiving cavity 110. For example, the angle between the guide slope 121 and the horizontal plane can be 15°, 30°, 45°, or 60°, depending on the actual design requirements, and is not limited here. When the angle is too small, the water flow may not be able to effectively conform to the slope, easily forming a local stagnant area in front of the protruding structure 120; when the angle is too large, the water flow impact force may be too concentrated, affecting the guiding effect and even causing local scouring of the bottom of the receiving cavity 110.

[0040] Furthermore, the surface of the guide slope 121 can be made smooth to reduce frictional resistance when water flows through it and improve the flow guiding efficiency. The material of the guide slope 121 can be consistent with that of the raised structure 120, for example, it can be made of materials with good corrosion resistance and certain mechanical strength, such as stainless steel, engineering plastics or aluminum alloys, to ensure structural stability and service life under long-term hot water reflux conditions.

[0041] Furthermore, the raised structure 120 can be configured as one or more. Specifically, the number of raised structures 120 can be one, two, or more, and there is no unique limitation. When multiple raised structures 120 are configured, each raised structure 120 can be arranged sequentially along the water outlet direction of the return pipe 200, or arranged in a ring around the outlet of the return pipe 200, so as to achieve multi-point guidance of water flowing out from different directions, further improve the uniform distribution of water flow at the bottom of the receiving cavity 110, reduce the local temperature gradient, and facilitate the stable operation of subsequent heat exchange or water circulation processes.

[0042] Specifically, the water tank device 10 also includes a heating element 300, which is installed inside the tank body 100 and is at least partially suspended in the receiving cavity 110. The heating element 300 is used to heat the heat exchange medium in the receiving cavity 110.

[0043] The heating element 300 can take the form of an electric heating tube, heating wire, PTC heating element, or electromagnetic induction heating structure, etc., and its specific form can be selected according to the power requirements, installation space, and safety standards of the actual application scenario. For example, when an electric heating tube is used as the heating element 300, its outer wall can directly contact the heat exchange medium (such as water) in the receiving cavity 110, and heat the medium through heat conduction; when an electromagnetic induction heating structure is used, an induction coil can be set at the bottom or side wall of the housing 100, and non-contact heating can be achieved in conjunction with the metal housing 100 or the built-in metal heat-conducting plate, thereby reducing the risk of direct corrosion between the heating element 300 and the medium. The heating element 300 is at least partially suspended in the receiving cavity 110, so that its heating area is fully exposed to the heat exchange medium, which is beneficial to improving heat exchange efficiency, while avoiding the problem of excessively long heat transfer paths and increased heat loss caused by being completely embedded in the wall of the housing 100.

[0044] By configuring the heating element 300 to work in conjunction with the housing 100, the heating element 300 can heat the water flow inside the housing 100. During the heating process, the heat exchange medium is heated in the containment cavity 110 and its temperature rises, forming hot water with a certain amount of thermal energy, providing the basic conditions for subsequent heat energy output or recycling.

[0045] In some embodiments, the water tank device 10 further includes a circulation pump, which drives the hot water in the tank 100 to be transported to an external device and returned to the tank 100 through the return pipe 200. The circulation pump can be located at the outlet of the tank 100 or integrated into the connecting pipe between the return pipe 200 and the tank 100. Its function is to establish a stable medium circulation force, so that the heated hot water can be continuously and controllably transported to external heat exchange equipment, heat dissipation terminals or other heat-using units. One end of the return pipe 200 is connected to the outlet of the external device, and the other end is connected to the return port of the tank 100, forming a closed or semi-closed circulation loop. Through this circulation structure, not only can continuous heat output be achieved, but the uniformity of the medium temperature in the tank 100 can also be maintained, avoiding a decrease in heating efficiency due to local overheating or temperature stratification.

[0046] Specifically, the heating element 300 includes a connecting section 310 and a surrounding section 320. The two connecting sections 310 are respectively connected to the opposite ends of the surrounding section 320. The orthographic projection of the surrounding section 320 on the bottom of the receiving cavity 110 is at least partially an arc-shaped structure, and the return pipe 200 is located inside the surrounding section 320.

[0047] The arc-shaped structure of the surrounding section 320 can be a complete spiral, a semi-circle, a superior arc, or a inferior arc, depending on the spatial layout of the bottom of the receiving cavity 110 and the requirements for heating uniformity.

[0048] Arranging the surrounding section 320 inside the housing 100 allows the heating element 300 to cover a larger area at the bottom of the receiving cavity 110, thereby improving the heating effect. Because the surrounding section 320 is distributed in an extended manner along the bottom of the receiving cavity 110, compared to traditional linear or point-like heating structures, it can more evenly transfer heat to the liquid medium at the bottom of the receiving cavity 110, reducing localized overheating or heating blind spots. Furthermore, the surrounding section 320 can be made of bent metal tubing, with an embedded heating wire or PTC ceramic heating element, and its outer surface can be treated with an anti-corrosion or thermally conductive coating to improve heat transfer efficiency and extend service life.

[0049] By placing the return pipe 200 inside the surrounding section 320, the cold water returning through the return pipe 200 can quickly contact the heating element 300, thereby improving the water temperature stability of the water tank device 10. The return pipe 200 is typically used to guide used low-temperature water or cooling water back to the receiving cavity 110. When arranged within the area enclosed by the surrounding section 320, the low-temperature water is first heated by the heat released from the surrounding section 320 upon entering the receiving cavity 110, shortening the heat exchange path between the cold water and the heat source and accelerating the temperature rise response. Simultaneously, because the surrounding section 320 forms a partial enclosure structure around the return pipe 200, it reduces the disturbance to the overall water temperature caused by the cold water in the initial stage of entering the receiving cavity 110, helping to maintain the continuity and stability of the outlet water temperature. The body of the return pipe 200 can be made of copper, stainless steel, or heat-resistant plastic, and its outer diameter is adapted to the inner space of the surrounding section 320, ensuring an appropriate gap between them to facilitate heat convection while avoiding structural interference due to thermal expansion.

[0050] Furthermore, the distance between the circumferential section 320 and the top of the receiving cavity 110 is greater than the distance between the circumferential section 320 and the bottom of the receiving cavity 110.

[0051] This arrangement is based on the natural convection characteristics of liquids during heating: cold water, with its higher density, tends to settle at the bottom of the container; hot water, with its lower density, flows upward after being heated. By positioning the surrounding section 320 near the bottom of the receiving cavity 110, it can more directly contact the area of ​​cold water with a lower initial temperature, thereby enabling effective heat exchange with the cold water in the early stages of heating, reducing heat loss during the transfer process, and improving overall heating efficiency.

[0052] Specifically, the surrounding section 320 can be located in the lower third of the height region of the receiving cavity 110. For example, when the total height of the receiving cavity 110 is H, the centerline of the surrounding section 320 can be set within the range of 0.2H to 0.33H from the bottom of the receiving cavity 110. It should be noted that this ratio can be 0.2H, 0.25H, 0.3H, or 0.33H, and is determined comprehensively based on factors such as actual heating power, fluid flow characteristics, and structural space layout, and is not limited to a single value here. If the surrounding section 320 is set too high, such as in the middle or upper part of the receiving cavity 110, it will mainly contact the upper liquid that has not yet circulated sufficiently in the initial stage of heating, while the cold water at the bottom will be difficult to heat in time, resulting in uneven heating and a reduced overall heating rate; if it is set too low, although it can fully contact the cold water, it may be limited by the bottom structural space, affecting the layout length or bending radius of the surrounding section 320, thereby limiting the heat exchange area or causing excessive fluid resistance. Therefore, by rationally arranging the surrounding section 320 near the bottom but leaving adequate installation and flow space, the heat exchange performance can be optimized while ensuring structural feasibility.

[0053] In one embodiment, the inner diameter of the return pipe 200 is d, the distance between the return pipe 200 and the bottom of the receiving cavity 110 is also d, and the return water cross-section of the return pipe 200 inside the receiving cavity 110 is A, satisfying the relationship: π×d×s≥A, where s is the distance between the end of the return pipe 200 and the bottom of the receiving cavity 110. It should be noted that d here can be 2mm, 2.5mm, 4mm, 5mm or 6mm, and the specific value is selected according to the actual equipment size, fluid properties and flushing requirements, and is not limited here. When d is less than 2mm, the flow capacity of the return pipe 200 is limited, which may lead to insufficient return water flow and difficulty in forming an effective radially spreading flow layer at the bottom of the receiving cavity 110, thereby affecting the flushing effect on the bottom area; while when d is greater than 6mm, although the flow rate increases, it may lead to excessively concentrated water flow impact and excessively high local flow velocity, which may destroy the uniformity of the flow layer and even cause local eddies or splashes, which is not conducive to stable flushing.

[0054] In one embodiment, the return flow rate of the return pipe 200 is V, and the return water cross-section of the return pipe 200 inside the receiving cavity 110 is A, satisfying the relationship: V / A < 0.5 m / s. This relationship is used to control the average flow velocity of the flow layer formed at the bottom of the receiving cavity 110, ensuring that the water spreads evenly at a low speed, thereby effectively covering and flushing the bottom area, avoiding water splashing, increased turbulence, or uneven flushing due to excessive flow velocity. Specifically, the value of V / A can be 0.1 m / s, 0.25 m / s, 0.4 m / s, or 0.48 m / s, and the specific value is adjusted according to the arrangement position of the return pipe 200, the size of the receiving cavity 110, and the required flushing intensity. If V / A ≥ 0.5 m / s, the water flow is prone to forming a jet effect during the bottom spreading process, making it difficult to form a continuous and stable thin layer flow, resulting in insufficient flushing in some areas and affecting the overall cleaning or mixing effect.

[0055] The return water section A can be the cross-sectional area of ​​the entire annular region that the water flow ejected from the return pipe 200 can effectively cover and scour at the bottom of the receiving cavity 110. Specifically, it is defined as follows: Because the outlet end of the return pipe 200 is extremely close to the bottom of the receiving cavity 110, the distance between its end and the bottom is usually equal to or slightly less than the inner diameter d of the return pipe 200. This causes the water flow, after being ejected from the return pipe 200, to be restricted vertically by the bottom and unable to develop upwards. Instead, it rapidly spreads radially under the constraint of the bottom, forming a thin-layer flow region with a thickness approximately equal to d and a horizontal coverage area approaching the entire bottom of the receiving cavity 110. This flow pattern resembles a "water cushion" or "pancake" structure. In this flow state, the water flow mainly relies on its initial momentum to diffuse radially along the bottom, while gradually decelerating under viscous force and wall friction, thereby achieving continuous scour of a large area at the bottom of the receiving cavity 110. The return water section A is the effective cross-sectional area of ​​the thin-layer flow region perpendicular to the flow direction. Its size depends on the combined effects of the outlet position of the return pipe 200, its inner diameter d, its distance from the bottom, and the return flow rate V. By rationally designing the above parameters, the return water section A can fully cover the key area at the bottom of the receiving cavity 110, thereby improving flushing efficiency and reducing sediment accumulation.

[0056] This utility model also provides a water treatment device 1, which includes a heat exchange component 20 and a water tank device 10 in any of the above embodiments; the heat exchange component 20 is used to output hot water; the water tank device 10 is thermally coupled to the heat exchange component 20. The heat exchange component 20 can be heated by the water tank device 10, that is, the heated heat exchange medium output from the water tank device 10 is transported to the heat exchange component 20 and can heat the heat exchange component 20, which then heats the water flow inside to output hot water; or, the water tank device 10 can also directly output the hot water stored inside to the user end to meet the user's hot water needs. In this water treatment device 1, the water tank device 10 and the heat exchange component 20 achieve heat energy exchange through heat conduction or heat convection, etc. The two can be directly contacted thermally coupled or indirectly thermally coupled through a heat-conducting wall surface. The specific thermal coupling method can be selected according to the overall layout of the equipment and the thermal efficiency requirements.

[0057] It is understood that in the water treatment equipment 1 of this embodiment, by setting the water tank device 10 in any of the above embodiments, the overall thermal energy utilization efficiency and hot water output stability can be effectively improved. In the water tank device 10 of this embodiment, the end of the return pipe 200 is suspended in the receiving cavity 110, and the distance between the return pipe 200 and the bottom of the receiving cavity 110 is less than the inner diameter of the return pipe 200. This structural design makes the outlet of the return pipe 200 close to the bottom of the tank 100. At the same time, combined with its inner diameter, it effectively increases the contact cross section between the return water and the bottom of the tank 100, reduces the local flow velocity of the return water, and is conducive to the stable deposition of low temperature return water at the bottom of the tank 100, thereby improving the heating effect of the water treatment equipment 1.

[0058] Specifically, the water treatment equipment 1 also includes a water channel structure 30, through which the water tank device 10 and the heat exchange component 20 are connected to realize the flow of water medium between the water tank device 10 and the heat exchange component 20. The water channel structure 30 serves as a fluid channel connecting the water tank device 10 and the heat exchange component 20, and its structural form can be flexibly designed according to the overall layout of the equipment, space constraints, and fluid resistance requirements.

[0059] Specifically, the water system structure 30 can be a water manifold or a combination of multiple pipes. When the water system structure 30 is in the form of a water manifold, multiple flow channels can be integrated inside the water manifold to guide the inlet, outlet, or circulating water flow respectively, thereby reducing the number of external connection pipes, improving the overall structural compactness, and reducing the risk of leakage. The water manifold can be made of metal materials (such as stainless steel or aluminum alloy) or engineering plastics (such as PP or PVDF), and the specific material selection must take into account corrosion resistance, pressure resistance, and processability. When the water system structure 30 adopts a combination of multiple pipes, the pipes can be connected by elbows, tees, flanges, or quick-connect fittings, which facilitates on-site installation and subsequent maintenance. The pipe materials can be flexible hoses, rigid plastic pipes, or metal pipes, matched according to the working temperature, pressure, and medium characteristics.

[0060] It should be noted that the specific form of the water channel structure 30 is not limited to the two mentioned above. It can also be a hybrid structure of water channel plate and pipes, for example, some flow channels are integrated into the water channel plate, while the remaining connections are made through external pipes, in order to balance integration and pipe layout flexibility. Regardless of the form adopted, the water channel structure 30 must ensure reliable sealing of the flow channels and a reasonable flow cross-section to avoid excessive flow resistance or turbulence loss caused by local diameter reduction or sharp bends, thereby affecting heat exchange efficiency or increasing the water pump load. In addition, the inlet and outlet positions of the water channel structure 30 can be adapted to the interface orientation of the water tank device 10 and the heat exchange component 20 to ensure convenient assembly and smooth fluid path.

[0061] In one embodiment, the water treatment equipment 1 further includes a housing 40, which serves as a mounting carrier for installing the water tank device 10, the heat exchange component 20, and the water circuit structure 30. The housing 40 has an overall box-like structure with multiple mounting areas inside, used to fix the water tank device 10, the heat exchange component 20, and the water circuit structure 30, thereby achieving an integrated layout of the various functional modules. The housing 40 can be made of metal or high-strength engineering plastics to ensure structural strength and corrosion resistance, adapting to the long-term stable operation of the water treatment equipment 1 in different environments. Specifically, the housing 40 can be equipped with positioning structures such as mounting brackets, slots, threaded holes, or guide rails to limit and fix the water tank device 10, the heat exchange component 20, and the water circuit structure 30, preventing displacement or loosening of the equipment during transportation or operation. In addition, the front, rear, or top of the housing 40 can be provided with removable inspection doors or covers to facilitate maintenance or replacement of internal components. By integrating the water tank device 10, heat exchange component 20 and water circuit structure 30 into the outer shell 40, the overall structural compactness of the water treatment equipment 1 is improved, the length of external pipeline connections is effectively reduced, the risk of leakage is reduced, and the standardized production and modular assembly of the equipment are facilitated.

[0062] Specifically, the heat exchange assembly 20 includes a heat exchange element 201 and an instant heating element 202. The water tank device 10 is thermally coupled to the heat exchange element 201, and the heat exchange element 201 is used to heat the water flow. The instant heating element 202 is connected to the output end of the heat exchange element 201 and is used to heat the water flow output by the heat exchange element 201.

[0063] The heat exchanger 201 can be a plate heat exchanger, such as a plate heat exchanger composed of multiple layers of stacked metal plates. It has alternating water flow channels and heat exchange medium channels inside, allowing the heat exchange medium (such as high-temperature water or steam) in the water tank device 10 to transfer heat to the water flowing through the heat exchanger 201 via thermal conduction, thus preheating the water. Plate heat exchangers have advantages such as large heat transfer area, compact structure, and fast thermal response, which helps improve overall heat exchange efficiency. The instant heating element 202 can be a thick-film heating tube, which has a thick-film resistance heating layer inside. When water flows through the thick-film heating tube, the thick-film resistance heating layer is energized and heats up, providing rapid and precise secondary heating to the water, thereby ensuring that the outlet water temperature meets the usage requirements. Thick-film heating tubes have advantages such as fast heating speed, high power density, good corrosion resistance, and small size, making them suitable for scenarios requiring instant water heating.

[0064] The heat exchanger 201 absorbs the heat from the heat exchange medium supplied by the water tank device 10 and preheats the water flow within it. The water flow output from the heat exchanger 201 is then finally heated by the instantaneous heating element 202, effectively improving heating efficiency. This two-stage heating structure utilizes heat in stages. First, it uses the heat energy stored in the water tank device 10 to initially raise the temperature of the water flow, reducing the heating load required by the instantaneous heating element 202. This reduces the instantaneous power demand of the instantaneous heating element 202, extends its service life, and lowers the overall energy consumption. Simultaneously, since the heat exchanger 201 has preheated the water flow, the instantaneous heating element 202 only needs to complete the final heating within a smaller temperature rise range, which helps improve the stability and control accuracy of the outlet water temperature. Furthermore, this structure can prioritize the use of waste heat resources when the water tank device 10 has sufficient heat energy, achieving cascaded energy utilization and improving the overall thermal efficiency of the machine.

[0065] Water treatment equipment 1 can achieve a hot water flow rate of 1.5L / min. It should be noted that the hot water flow rate can be adjusted within the range of 0.8L / min to 2.0L / min according to actual usage requirements. For example, it can be 0.8L / min, 1.2L / min, 1.5L / min, 1.8L / min or 2.0L / min. The specific value is determined by comprehensively considering the equipment power configuration, the structural parameters of the heat exchange component 20 and the user's requirements for the outlet water temperature, and is not limited to a single value here.

[0066] In the description of the embodiments of this application, it should be noted that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the embodiments of this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the embodiments of this application. In addition, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0067] In the description of the embodiments of this application, it should be noted that, unless otherwise explicitly specified and limited, the terms "connected" and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in the embodiments of this application based on the specific circumstances.

[0068] In the embodiments of this application, unless otherwise expressly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0069] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of the embodiments of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0070] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this application.

Claims

1. A water tank device, characterized in that, include: The box has an internal cavity for receiving contents; and A return pipe is inserted into the housing, with its end suspended within the receiving cavity. The distance between the return pipe and the bottom of the receiving cavity is less than the inner diameter of the return pipe.

2. The water tank device according to claim 1, characterized in that, The inner diameter of the reflux pipe is 8-10 mm; and / or the distance between the reflux pipe and the bottom of the receiving cavity is 2-6 mm.

3. The water tank device according to claim 1, characterized in that, The housing also includes a protruding structure located at the bottom of the receiving cavity, and the orthographic projection of the return pipe on the bottom of the receiving cavity at least partially overlaps with the protruding structure.

4. The water tank device according to claim 3, characterized in that, The protruding structure has a guide slope on the side facing the return pipe. The edge of the guide slope is connected to the bottom of the receiving cavity, and the guide slope is used to guide the water flow output from the return pipe to the bottom of the receiving cavity.

5. The water tank device according to claim 1, characterized in that, The water tank device also includes a heating element, which is installed inside the tank and at least partially suspended in the receiving cavity. The heating element is used to heat the heat exchange medium in the receiving cavity.

6. The water tank device according to claim 5, characterized in that, The heating element includes a connecting section and a surrounding section. The two connecting sections are respectively connected to opposite ends of the surrounding section. The orthographic projection of the surrounding section on the bottom of the receiving cavity is at least partially an arc-shaped structure, and the return pipe is located inside the surrounding section.

7. The water tank device according to claim 6, characterized in that, The distance between the circumferential segment and the top of the receiving cavity is greater than the distance between the circumferential segment and the bottom of the receiving cavity.

8. The water tank device according to any one of claims 1-7, characterized in that, The inner diameter of the return pipe is d, the distance between the return pipe and the bottom of the receiving cavity is d, the return water cross section of the return pipe inside the receiving cavity is A, and the following relationship is satisfied: π×d×s≥A; And / or, the return flow rate of the return pipe is V, the return water cross section of the return pipe inside the receiving cavity is A, and the following relationship is satisfied: V / A<0.5m / s.

9. A water treatment device, characterized in that, include: Heat exchange components are used to output hot water; as well as The water tank device according to any one of claims 1-8, wherein the water tank device is thermally coupled to the heat exchange assembly.

10. The water treatment equipment according to claim 9, characterized in that, The heat exchange assembly includes a heat exchange element and an instant heating element. The water tank device is thermally coupled to the heat exchange element, and the heat exchange element is used to heat the water flow. The instant heating element is connected to the output end of the heat exchange element and is used to heat the water flow output by the heat exchange element.

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