Energy-saving device for circulating pool water at constant temperature

Abstract

The application discloses a pool water circulation constant-temperature energy-saving device, which comprises a three-layer coaxial pipe assembly, a passive temperature-sensing water taking assembly, a water-driven descaling assembly and a bottom cyclone mixing assembly. A paraffin temperature-sensing element is coaxially suspended at the top end of the middle layer distribution pipe, and a long tube sliding sleeve valve body is connected thereto, so that pure mechanical self-adapting layered water taking varying with the surface water temperature is realized by using the thermal expansion and cold shrinkage physical characteristics; an axial flow impeller and a spiral spring brush driven by water flow impact are sleeved on the outer wall of the heat exchange inner pipe, so that passive dynamic descaling and fluid disturbance of the pipe wall are realized; and a Venturi contraction nozzle is combined with a static cyclone guide vane at the bottom, and jet negative pressure suction of cold water is used for strong mixing. The whole system of the application relies on physical mechanical structure and fluid power driving, and does not need external electric control components, so that the problems of invalid heating caused by thermal stratification of the pool and heat exchange pipe fouling and the like are solved, and the comprehensive energy efficiency and mixed temperature uniformity of the constant-temperature system are remarkably improved.

Description

Technical Field

[0001] This invention relates to the field of swimming pool water treatment and constant temperature equipment technology, and in particular to a swimming pool water circulation constant temperature energy-saving device. Background Technology

[0002] A pool water circulation and temperature control system is a core infrastructure for ensuring the comfort of indoor and outdoor pools. In actual operation, due to differences in water's specific heat capacity and environmental heat dissipation, pool water is prone to significant thermal stratification (i.e., the surface water loses heat quickly, resulting in a lower temperature, while the bottom water retains heat well, resulting in a higher temperature). Existing pool water circulation and heating devices typically suffer from the following technical deficiencies: Traditional swimming pool water circulation systems typically use bottom drains or skimmers at a fixed depth to draw water, failing to detect the dynamic changes in the thermal stratification of the water. This results in the system repeatedly pumping already adequately warm bottom water into the machine room for reheating, which not only disrupts the energy cascade utilization efficiency of the water but also causes significant waste of thermal energy.

[0003] Pool water is rich in calcium and magnesium ions and sodium hypochlorite disinfectant, which easily precipitate on the surface of the tubes of high-temperature heat exchangers, forming dense scale. Scale causes a sharp increase in thermal resistance and a precipitous drop in heat exchange efficiency. Existing mechanical descaling devices mostly rely on external motors to drive reduction gear sets, which are prone to jamming and damage in the high humidity and corrosive chlorine environment of swimming pools, and are also very expensive to manufacture; or they can only rely on manual periodic acid washing, which is extremely costly to maintain.

[0004] Existing constant-temperature return water injection systems typically use a single straight-through nozzle, resulting in extremely slow mixing of the high-temperature return water with the large volume of cold water in the pool. This not only creates localized high-temperature stagnant water zones near the return inlet, but also wastes the powerful fluid kinetic energy carried by the return water itself, failing to effectively convert it into stirring work that promotes the homogenization of heat in the overall water body.

[0005] In summary, there is an urgent need for a pool water circulation and temperature control device that can adaptively sense changes in water temperature, possesses a purely mechanical structure for scale prevention and removal, and can fully utilize fluid kinetic energy for efficient water mixing. Summary of the Invention

[0006] The purpose of this invention is to solve the defects of existing pool water circulation systems, such as the inability to adapt to thermal stratification, easy scaling of heat exchange tubes, and uneven water mixing, and to propose a pool water circulation constant temperature energy-saving device.

[0007] To achieve the above objectives, the present invention adopts the following technical solution: a swimming pool water circulation constant temperature energy-saving device, the device comprising: a three-layer coaxial tube assembly, consisting of an inner tube, a middle layer distribution tube, and an outer layer protective tube arranged sequentially from the inside out; the middle layer distribution tube having surface water inlet areas and bottom water inlet areas spaced apart along the axial direction on its wall; and a passive temperature-sensing water intake assembly, disposed at the top of the middle layer distribution tube, comprising a paraffin wax temperature-sensing element and a sliding valve body linked thereto, the sliding valve body responding to the temperature of the paraffin wax... The deformation of the components causes axial displacement within the middle layer distribution pipe to alternately block or open the surface water inlet area and the bottom water inlet area; the hydraulically driven descaling assembly, sleeved on the outer wall of the inner pipe, includes an impeller and a spiral spring brush fixed to the impeller, the impeller being driven by the water flow to rotate the spiral spring brush along the outer wall of the inner pipe; the bottom vortex mixing assembly, connected to the bottom end of the three-layer coaxial pipe assembly, mixes the water heated by the inner pipe with the cold water drawn in from the surrounding environment and then discharges it.

[0008] Furthermore, the sliding valve body is a hollow long cylindrical structure, and a fluid communication window is provided on the side wall of the hollow long cylindrical structure; when the paraffin temperature sensing element is in a contracted state, the sliding valve body is in the upper position, the fluid communication window coincides with the surface water inlet area, and the solid tube wall of the hollow long cylindrical structure blocks the bottom water inlet area; when the paraffin temperature sensing element is in an expanded state, the sliding valve body is in the lower position, the fluid communication window coincides with the bottom water inlet area, and the solid tube wall of the hollow long cylindrical structure blocks the surface water inlet area.

[0009] Furthermore, the passive temperature-sensing water intake assembly also includes a multi-ribbed support; the paraffin temperature-sensing element is streamlined and is coaxially suspended and fixed on the central axis of the surface water inlet area through the multi-ribbed support, and an annular gap for water flow scouring is formed between the outer wall of the paraffin temperature-sensing element and the inner wall of the middle layer distribution pipe.

[0010] Furthermore, the inner diameter of the spiral spring brush is smaller than the outer diameter of the inner tube in the free state, so that the spiral spring brush flexibly hugs the outer wall of the inner tube in an interference fit.

[0011] Furthermore, the bottom swirling mixing assembly includes a Venturi constricting nozzle and an expanding mixing chamber communicating with the outlet end of the Venturi constricting nozzle; the throat sidewall of the Venturi constricting nozzle is provided with a negative pressure suction hole, which is connected to the outside of the outer protective tube; a static swirling guide plate is fixed inside the expanding mixing chamber.

[0012] Compared with the prior art, the beneficial effects of the present invention are as follows: By introducing a linkage structure between a paraffin-based temperature-sensing element and a hollow, long-cylinder sliding valve body, linear displacement is generated using the purely physical effect of thermal expansion and contraction, achieving alternating opening and closing of the surface and bottom water inlets. When the surface water temperature is low, surface water is automatically drawn; when the surface water temperature reaches the target level, the system automatically switches to drawing bottom water. This structure completely eliminates electronic sensors and PLC-controlled valves, achieving intelligent flow control that "always draws the coldest water layer," preventing ineffective heating at the source and significantly reducing the system's energy consumption.

[0013] By combining a hydraulic impeller with a spiral spring brush, the impeller's rotation is driven by the kinetic energy of the downward-flowing water provided by the circulating water pump. The spiral spring brush flexibly grips the outer wall of the inner tube with an interference fit, achieving real-time and constant scraping of the outer wall of the heat exchange inner tube without the need for any additional drive motor or complex gear transmission mechanism. At the same time, the rotating spiral spring brush generates a strong cutting and turbulent effect on the water flow, disrupting the thermal boundary layer of the tube wall, significantly improving the convective heat transfer coefficient, and achieving maintenance-free, long-term, and efficient operation.

[0014] By incorporating a Venturi constriction nozzle with negative pressure suction holes and an expansion mixing chamber containing static swirling guide vanes at the outlet end, this device completely transforms the horizontal return water into a highly turbulent jet. Utilizing Bernoulli's principle, it automatically draws in cold water from the pool bottom for initial mixing, which is then forcibly cut by static blades to form a tornado-like swirling jet. Without requiring any external stirring equipment, it converts 100% of the kinetic energy of the return water into water mixing work, completely eliminating localized high-temperature dead zones within the pool.

[0015] All operational logic of this device (sensing, commutation, descaling, and mixing) is achieved through the coupling of physical geometry topology and fluid dynamics, resulting in a system with "zero electronic components." This not only perfectly avoids the risk of corrosion failure of electrical control equipment in constant-temperature, high-humidity, and high-chlorine environments, but also greatly reduces manufacturing costs and installation and maintenance difficulties, making it highly valuable for commercial promotion and engineering transformation. Attached Figure Description

[0016] The accompanying drawings are provided to further illustrate the invention and form part of the specification. They are used together with the embodiments of the invention to explain the invention and do not constitute a limitation thereof.

[0017] Figure 1 This is a schematic diagram of the overall structure of the pool water circulation constant temperature energy-saving device in an embodiment of the present invention; Figure 2 This is a schematic diagram of the peeling structure of the outer protective tube in an embodiment of the present invention; Figure 3 This is a schematic diagram of the outer protective tube and the middle distribution tube in an embodiment of the present invention; Figure 4 This is an overall longitudinal sectional view in an embodiment of the present invention; Figure 5 This is a schematic diagram of the internal structure in an embodiment of the present invention.

[0018] In the diagram: 10. Three-layer coaxial tube assembly; 11. Inner tube; 12. Middle layer distribution tube; 13. Outer layer protective tube; 121. Surface water inlet area; 122. Bottom layer water inlet area; 20. Passive temperature-sensing water intake assembly; 21. Paraffin temperature sensing element; 22. Sliding valve body; 221. Hollow long cylinder structure; 222. Fluid communication window; 223. Solid pipe wall; 23. Multi-rib support; 24. Annular gap; 30. Hydraulic-driven descaling assembly; 31. Impeller; 32. Spiral spring brush; 40. Bottom swirl mixing assembly; 41. Venturi constriction nozzle; 42. Expansion mixing chamber; 411. Negative pressure suction hole; 421. Static swirl guide vane. Detailed Implementation

[0019] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0020] In the description of this invention, it should be understood that the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "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 this invention 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 this invention.

[0021] It should be noted that this embodiment includes... Figure 1 To be continued Figure 5 The lengths, diameters, orifices, and proportional relationships of the various components, pipes, and valves shown are merely illustrative proportions for explaining the working principle of the present invention, and not strict engineering assembly proportions. Those skilled in the art should understand that in the actual engineering implementation of the present invention, the total length of the three-layer coaxial pipe assembly 10 and the axial distance between the upper surface inlet area 121 and the lower surface inlet area 122 of the middle layer distribution pipe 12 can be proportionally lengthened, shortened, or adaptively adjusted according to the actual water depth of the target swimming pool (such as a shallow pool, a deep pool, or a standard competition pool). Such parameter fine-tuning of the component length based on the specific engineering environment falls within the protection scope of the present invention.

[0022] like Figures 1-5As shown, this embodiment provides a pool water circulation constant temperature energy-saving device. This device primarily addresses the technical problems existing in current pool water circulation systems, such as the inability to adaptively utilize water thermal stratification, easy scaling of heating pipes, and uneven mixing of hot and cold water. It proposes a purely mechanical, passively driven fluid control and heat exchange optimization scheme. Structurally, the device is mainly composed of four core modules: a three-layer coaxial tube assembly 10 nested from the outside in; a passive temperature-sensing water intake assembly 20 at the top; a hydraulically driven descaling assembly 30 located at the upper end of the inner tube and on the outer wall; and a bottom vortex mixing assembly 40 at the bottom.

[0023] The three-layer coaxial tube assembly 10 constitutes the main skeleton and fluid channel of the device, and is fitted with an outer protective tube 13, a middle distribution tube 12 and an inner tube 11 from the outside to the inside.

[0024] The outer protective pipe 13 has densely packed filter holes throughout its wall, primarily serving as a dust filter. Water can penetrate the outer protective pipe 13 from all directions, while preventing large debris such as leaves and hair from entering the pool and jamming the sliding valve. The middle distribution pipe 12 is a solid cylindrical structure, with surface water inlet area 121 and bottom water inlet area 122 spaced apart only at its upper and lower middle ends. The surface water inlet area 121 and bottom water inlet area 122 are significantly spaced apart in the longitudinal height (for example, the distance can be 1 / 2 to 2 / 3 of the total length of the device) to ensure that they respectively draw surface water and bottom water from the pool where there is a significant temperature difference.

[0025] The passive temperature-sensing water intake component 20, located at the top of the middle layer distribution pipe 12, is the core actuator for the device's adaptive cold water acquisition. To avoid mechanical interference between temperature sensing and physical blockage, the component is structurally decoupled from the sensing and execution functions, mainly comprising a paraffin-based temperature sensing element 21 and a sliding valve body 22 driven by it.

[0026] The paraffin-coated temperature sensing element 21 is streamlined and torpedo-shaped, coaxially suspended and fixed on the central axis of the surface water inlet area 121 via a multi-ribbed support 23. The paraffin-coated temperature sensing element 21 remains stationary, with an annular gap 24 between its outer wall and the inner wall of the middle layer distribution pipe 12. Regardless of which side the water enters from, the water flow can pass through the annular gap 24 to flush the paraffin-coated temperature sensing element 21, ensuring its sensitive detection of water temperature changes.

[0027] The sliding valve body 22 is a hollow elongated cylindrical structure 221 located between the inner wall of the middle layer distribution pipe 12 and the inner pipe 11, which can slide axially up and down as the push rod of the paraffin temperature sensing element 21 extends and retracts. A fluid communication window 222 is provided on the side wall of the hollow elongated cylindrical structure 221, and the rest is a solid pipe wall 223. There is a specific geometric misalignment difference between the opening distance between the fluid communication window 222 and the surface water inlet area 121 and the bottom water inlet area 122.

[0028] The hydraulically driven descaling assembly 30 is mainly used to automatically descale the outer wall of the inner pipe 11 using fluid kinetic energy. It includes an axial-flow impeller 31 and a spiral spring brush 32.

[0029] To prevent water flow bypass and ensure that the impeller 31 obtains maximum fluid kinetic energy, the impeller 31 is installed inside the intermediate distribution pipe 12 and located strictly below the lowest stroke of the sliding sleeve valve body 22 (i.e., at the very top of the inner pipe 11). The central ring of the impeller 31 is loosely fitted onto the inner pipe 11, and its blades have an inclination angle of approximately 30 to 45 degrees, with the outer edges of the blades close to the inner wall of the intermediate distribution pipe 12. The spiral spring brush 32 is wound around the outer wall of the inner pipe 11, and its upper end is fixedly connected to the central ring of the impeller 31. The inner diameter of the spiral spring brush 32 is slightly smaller than the outer diameter of the inner pipe 11 in the free state, thus flexibly gripping the inner pipe 11 with an interference fit. When the water flow impacts the impeller 31 downwards, the blades convert the linear kinetic energy of the water flow into circumferential rotational torque, driving the spiral spring brush 32 to rotate around the inner pipe 11 to scrape away scale.

[0030] The bottom vortex mixing assembly 40 is connected to the bottommost end (outlet) of the three-layer coaxial tube assembly 10. It includes a Venturi contraction nozzle 41 with a "contraction first, expansion later" cross-sectional feature and an expansion mixing chamber 42.

[0031] A negative pressure suction hole 411 is laterally perforated on the throat sidewall of the venturi constriction nozzle 41, which connects to the outside of the outer protective tube 13. Several twisted static swirl guide vanes 421 are fixed inside the trumpet-shaped expansion mixing chamber 42.

[0032] Furthermore, regarding the spatial matching relationship between the axial displacement stroke of the sliding valve body 22 and the length of the inner tube 11, this device establishes the following dynamic anti-interference boundary conditions: a fluid confluence buffer zone is reserved between the top of the inner tube 11 and the bottom of the sliding valve body 22 when it is at its highest position; the maximum axial displacement of the sliding valve body 22 as it expands downward with the paraffin temperature sensing element 21 is strictly less than the longitudinal height of the fluid confluence buffer zone. This structurally ensures that when the sliding valve body 22 moves downward to switch the flow channel to its lowest position, its bottom will never mechanically collide with the top of the inner tube 11 or the impeller 31, or experience motion interference. Simultaneously, the length of the hollow long cylindrical structure 221 is adapted to the movement stroke of the sliding valve body 22. Through the long tube body and the small stroke, the sliding valve body 22 only needs to move downward a very small axial distance to utilize the misalignment between the fluid communication window 222 and the solid tube wall 223 to achieve the switching of the opening and closing states of the extremely large-span surface water inlet area 121 and the bottom water inlet area 122.

[0033] Through the precise fit of the above structures, the working principle of this device is as follows: Normal operating condition without heating (cold water): When the pool water temperature is low, the paraffin inside the paraffin temperature sensing element 21 is in a contracted state, and its push rod retracts under the action of the bottom return spring. At this time, the sliding valve body 22 is pushed to the highest point (upper position). In this position, the fluid communication window 222 on the side wall of the sliding valve body 22 is precisely aligned with the surface water inlet area 121, while the solid pipe wall 223 completely blocks the bottom water inlet area 122. When the water pump is working, it draws surface water from the pool into the middle layer distribution pipe 12. The water flows downward through the annular gap 24, converges, impacts the impeller 31 to rotate and remove scale, and is then heated and discharged downward through the inner pipe 11.

[0034] Heating meets standards (hot water) but is not a normal operating condition: When the surface water temperature is heated to a higher temperature, the suspended paraffin temperature sensing element 21 expands due to heat, extending a push rod to overcome the spring force and push the long cylindrical sliding valve body 22 downwards a small distance (lower position). At this time, the fluid communication window 222 moves downwards and offsets from the surface water inlet area 121, causing the solid pipe wall 223 to block the surface water inlet area 121; simultaneously, the lowered fluid communication window 222 is aligned and connected with the lower bottom water inlet area 122. The device automatically switches to extracting the cold water layer at the bottom of the pool.

[0035] Tail-end jet mixing process: The high-temperature water, heated by the inner tube 11, flows downwards at high speed into the bottom vortex mixing assembly 40. As it passes through the narrowest point of the Venturi constriction nozzle 41, the flow velocity increases dramatically, creating a low-pressure zone. At this time, the unheated cold water around the pool bottom is forcibly drawn into the tube through the negative pressure suction hole 411. The cold water and the high-temperature water enter the expansion mixing chamber 42 together, where, under the forced guidance of the static vortex guide plate 421, a violent tornado-like vortex is formed, ultimately being sprayed back into the pool at a uniform temperature. This completely eliminates the risk of localized high-temperature burns and greatly improves the pool water's mixing efficiency.

[0036] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A swimming pool water circulation constant temperature energy-saving device, characterized in that, The device includes: The three-layer coaxial tube assembly (10) consists of an inner tube (11), a middle layer distribution tube (12) and an outer layer protective tube (13) arranged sequentially from the inside to the outside. The middle layer distribution tube (12) has a surface water inlet area (121) and a bottom water inlet area (122) spaced apart along the axial direction. The passive temperature-sensing water intake assembly (20) is located at the top of the middle layer distribution pipe (12), including a paraffin temperature-sensing element (21) and a sliding valve body (22) linked thereto. The sliding valve body (22) moves axially within the middle layer distribution pipe (12) as the paraffin temperature-sensing element (21) deforms, so as to alternately block or open the surface water inlet area (121) and the bottom water inlet area (122). A hydraulically driven descaling assembly (30) is fitted on the outer wall of the inner tube (11) and includes an impeller (31) and a spiral spring brush (32) fixed to the impeller (31). The impeller (31) is driven by the water flow to rotate the spiral spring brush (32) along the outer wall of the inner tube (11). The bottom swirling mixing component (40), connected to the bottom end of the three-layer coaxial tube assembly (10), mixes the water heated by the inner tube (11) with the cold water drawn in from the surrounding environment and then discharges it.

2. The apparatus according to claim 1, characterized in that, The sliding valve body (22) is a hollow long cylindrical structure (221), and a fluid communication window (222) is provided on the side wall of the hollow long cylindrical structure (221). When the paraffin temperature sensing element (21) is in a contracted state, the sliding valve body (22) is in the upper position, the fluid communication window (222) coincides with the surface water inlet area (121), and the solid tube wall (223) of the hollow long cylinder structure (221) blocks the bottom water inlet area (122). When the paraffin temperature sensing element (21) is in an expanded state, the sliding valve body (22) is in the lower position, the fluid communication window (222) coincides with the bottom water inlet area (122), and the solid tube wall (223) of the hollow long cylinder structure (221) blocks the surface water inlet area (121).

3. The apparatus according to claim 1, characterized in that, The passive temperature sensing water intake component (20) also includes a multi-rib support (23); The paraffin temperature sensing element (21) is streamlined and is coaxially suspended and fixed on the central axis of the surface water inlet area (121) by the multi-rib bracket (23). An annular gap (24) for water flow scouring is formed between the outer wall of the paraffin temperature sensing element (21) and the inner wall of the middle layer distribution pipe (12).

4. The apparatus according to claim 1, characterized in that, The inner diameter of the spiral spring brush (32) is smaller than the outer diameter of the inner tube (11) in the free state, so that the spiral spring brush (32) flexibly hugs the outer wall of the inner tube (11) in an interference fit.

5. The apparatus according to claim 1, characterized in that, The bottom swirling mixing assembly (40) includes a Venturi constricting nozzle (41) and an expanding mixing chamber (42) connected to the outlet end of the Venturi constricting nozzle (41). The throat sidewall of the Venturi constriction nozzle (41) is provided with a negative pressure suction hole (411), which is connected to the outside of the outer protective tube (13); a static swirl guide plate (421) is fixed inside the expansion mixing chamber (42).

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