Adjustable pool return flow control device

Abstract

The utility model discloses a kind of adjustable swimming pool backwater flow control device, including shell, inner tube, valve plate and grating cover. Shell is installed in pool bottom and is connected with circulating pipeline, and inner tube is arranged in shell to form water flow passage. Water-passing hole is opened in the side wall of inner tube, and valve plate moves axially in inner tube by guiding structure. Drive bolt connects grating cover and valve plate, and rotating bolt can drive valve plate to move axially, change the effective flow area of water-passing hole, so as to realize the continuous accurate regulation of backwater flow. The utility model can adapt to the flow demand of different swimming pool area and purpose, maintain system hydraulic balance, improve filtration effect and operation safety, and structure is simple, and operation and maintenance are convenient.

Description

Technical Field

[0001] This utility model relates to the field of swimming pool equipment technology, specifically to an adjustable swimming pool return water inlet flow control device. Background Technology

[0002] The pool's return inlet is a crucial component of the water circulation system, responsible for returning pool water to the filtration and disinfection system. Currently, most pool return inlets use a fixed-flow grating cover structure, whose flow area cannot be changed. This structure has significant drawbacks: First, the optimal return flow rate varies in different areas of the pool (such as deep and shallow areas) or for different purposes (such as competition and recreational pools), and a fixed return inlet cannot meet these differentiated needs. Second, when the system pump operating conditions change or the filter becomes clogged, causing changes in system resistance, the fixed return inlet cannot adapt accordingly, potentially affecting the hydraulic balance of the entire circulation system, even leading to excessive suction causing safety hazards, or insufficient suction affecting filtration efficiency.

[0003] While some designs attempt to adjust flow rate by replacing cover plates with different orifice diameters, this method is discontinuous, cumbersome, and requires stocking various sizes of spare parts, making it impractical. Therefore, there is an urgent need for a device that can linearly, steplessly, and precisely adjust the return water flow rate. Utility Model Content

[0004] The purpose of this invention is to provide an adjustable swimming pool return water flow control device to solve the aforementioned problems existing in current swimming pools.

[0005] To achieve the above objectives, the present invention adopts the following technical solution: An adjustable swimming pool return water flow control device includes a housing, an inner cylinder, a valve plate, and a grid cover. The housing is installed on the pool bottom and connected to the pool circulation pipe. The inner cylinder is located inside the housing, and a water flow channel is formed between the inner cylinder and the housing. The grid cover is located on the top of the housing. The valve plate is located in the inner cylinder and is restricted from rotating relative to the inner cylinder by a limiting structure, and is connected to the grid cover by a driving component. At least one water passage hole is formed axially on the side wall of the inner cylinder. When the driving component is rotated, the valve plate undergoes axial displacement under the action of the limiting structure, causing a change in the area of ​​the water passage hole, thereby altering the effective flow area of ​​the water flow channel.

[0006] Furthermore, the limiting structure includes at least one guide protrusion disposed on the inner wall of the inner cylinder, and at least one guide groove disposed on the edge of the valve plate and slidingly engaged with the guide protrusion.

[0007] Furthermore, the driving component is a bolt, and the valve plate is provided with a nut that mates with the bolt's threads. The grille plate is provided with mounting holes for the bolt to pass through, with the top of the bolt supported in the mounting holes and the bottom threadedly connected to the nut. When the bolt is rotated, the valve plate undergoes axial displacement under the action of the limiting structure, causing a change in the area of ​​the water passage holes, thereby altering the effective flow area of ​​the water channel.

[0008] Furthermore, multiple water passage holes are evenly distributed along the circumference of the inner wall of the inner cylinder.

[0009] Furthermore, the grille cover is secured to the top of the housing with screws.

[0010] Furthermore, the upper side of the valve plate has a streamlined structure to guide the water flow smoothly.

[0011] The beneficial effects of this utility model are: This invention achieves continuous, stepless adjustment of the return water flow rate by changing the effective flow area of ​​the inner cylinder's water passage through the axial movement of the valve plate. Operators can precisely set the flow rate according to the water depth characteristics of different areas of the pool (deep water areas require larger flow rates, shallow water areas require smaller flow rates) or different usage scenarios (stable flow rates are needed during competitions, safe flow rates are needed for recreational use), fully meeting the precise water flow control requirements of modern swimming pools. The device adopts a bolt-nut transmission combined with a guide groove limiting mechanical structure, ensuring reliable transmission and eliminating the risk of jamming. Adjustment only requires turning the bolt with a regular wrench; no special tools are needed. The entire adjustment process is simple and intuitive, easily operated even by non-professionals. Compared to traditional methods that require replacing parts, this device greatly simplifies the operation process and improves ease of use. Attached Figure Description

[0012] Figure 1 This is a schematic diagram (three-dimensional view) of the adjustable swimming pool return water flow control device of this utility model. Figure 2 This is a schematic diagram (exploded view) of the adjustable swimming pool return water flow control device of this utility model. Figure 3 This is a cross-sectional view of the adjustable swimming pool return water flow control device of this utility model.

[0013] The names corresponding to each mark in the diagram: 1-Outer shell, 11-Water flow channel, 2-Inner cylinder, 21-Water passage hole, 22-Guide protrusion, 3-Valve plate, 31-Guide groove, 4-Grate cover, 41-Mounting hole, 42-Screw, 5- Bolts 6-Nut. Detailed Implementation

[0014] 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.

[0015] like Figures 1-3 As shown, the adjustable pool return flow control device mainly includes an outer shell 1, an inner cylinder 2, a valve plate 3, and a grille cover 4. The outer shell 1 is a cylindrical structure made of UPVC or stainless steel, with an interface at the bottom for connection to the pool circulation pipe. The outer shell 1 is fixed to the bottom of the pool by embedded parts or special clamps.

[0016] The inner cylinder 2 is coaxially installed inside the outer shell 1, forming an annular water flow channel 11 between them. Multiple rows of water passage holes 21 are formed along the axial direction on the side wall of the inner cylinder 2. These water passage holes are evenly distributed around the circumference of the inner cylinder to ensure uniform water flow in all directions. The water passage holes 21 are rectangular or elliptical in shape and arranged axially; their total flow area determines the maximum flow capacity of the device.

[0017] Figure 2 As shown, the valve plate 3 has a disc-shaped structure and is installed inside the inner cylinder 2. Multiple guide grooves 31 are formed on the outer edge of the valve plate 3, which cooperate with the guide protrusions 22 on the inner wall of the inner cylinder 2. This cooperation ensures that the valve plate 3 can only move along the axis of the inner cylinder and cannot rotate relative to it. The upper surface of the valve plate 3 is designed with a streamlined structure to effectively reduce water flow resistance.

[0018] The grille cover 4 is fixed to the top of the outer casing 1 by screws 42, serving both safety protection and decorative purposes. The grille cover 4 has a mounting hole 41 in its center, through which bolts 5 pass to form a threaded connection with the nut 6 on the valve plate 3. The head of the bolt 5 is designed with an internal hexagon or other anti-slip structure for easy adjustment using tools.

[0019] Work process: When it is necessary to adjust the return water flow, use a wrench to rotate bolt 5. Since the valve plate 3 is restricted from rotation by the cooperation between the guide groove 31 and the guide protrusion 22, the rotational movement of bolt 5 is converted into the axial movement of valve plate 3.

[0020] When the bolt 5 is rotated clockwise, the valve plate 3 moves upward, gradually blocking the water passage hole 21 on the inner cylinder 2, reducing the effective flow area and decreasing the return water flow. When the valve plate 3 moves to the uppermost position, the water passage hole 21 is completely blocked, and the flow rate reaches its minimum value.

[0021] When the bolt 5 is rotated counterclockwise, the valve plate 3 moves downward, gradually exposing the water passage hole 21 on the inner cylinder 2, increasing the effective flow area and the return water flow rate. When the valve plate 3 moves to the lowest position, the water passage hole 21 is fully exposed, and the flow rate reaches its maximum value.

[0022] By precisely controlling the axial position of valve plate 3, continuous stepless adjustment of the flow rate can be achieved. Operators can set the flow rate to any value between the minimum and maximum values ​​according to actual needs, thereby optimizing the operation of the pool water circulation system.

[0023] Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of this utility model are within the protection scope of this utility model.

Claims

1. An adjustable swimming pool return water inlet flow control device, characterized in that: The device includes an outer shell, an inner cylinder, a valve plate, and a grid cover. The outer shell is installed on the bottom of the pool and connected to the pool circulation pipe. The inner cylinder is located inside the outer shell, and a water flow channel is provided between the inner cylinder and the outer shell. The grid cover is located on the top of the outer shell. The valve plate is located inside the inner cylinder and is restricted from rotating relative to the inner cylinder by a limiting structure. It is connected to the grid cover by a driving component. At least one water passage hole is provided on the side wall of the inner cylinder along the axial direction. When the driving component is rotated, the valve plate undergoes axial displacement under the action of the limiting structure, causing the area of ​​the water passage hole to change, thereby changing the effective flow area of ​​the water flow channel.

2. The adjustable swimming pool return water inlet flow control device according to claim 1, characterized in that: The limiting structure includes at least one guide protrusion disposed on the inner wall of the inner cylinder, and at least one guide groove disposed on the edge of the valve plate and slidingly engaged with the guide protrusion.

3. The adjustable swimming pool return water inlet flow control device according to claim 1, characterized in that: The driving component is a bolt, and the valve plate is provided with a nut that is threaded to the bolt. The grille cover is provided with a mounting hole for the bolt to pass through. The top of the bolt is supported in the mounting hole, and the bottom is threaded to the nut. When the bolt is rotated, the valve plate is axially displaced under the action of the limiting structure, which changes the area of ​​the water passage hole, thereby changing the effective flow area of ​​the water flow channel.

4. The adjustable swimming pool return water inlet flow control device according to claim 1, characterized in that: The water passage holes are evenly distributed around the inner wall of the inner cylinder.

5. The adjustable swimming pool return water inlet flow control device according to claim 1, characterized in that: The grille cover is fixed to the top of the housing with screws.

6. The adjustable swimming pool return water inlet flow control device according to claim 1, characterized in that: The upper side of the valve plate has a streamlined structure to guide the water flow smoothly.

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