Surfing facility for standing waves

Abstract

The invention relates to a surfing facility and to a method for operating same, wherein the surfing facility has at least: a main pump for generating a water flow for a standing wave, the main pump being a radial pump which is situated outside the basin and below / above the water edge; an intake line which is connected to the main pump and has an inlet opening positioned below the water edge; and a diffuser which is connected to the main pump and has an outlet opening with a larger cross-sectional area than the outlet opening of the main pump, the outlet opening of the diffuser being positioned above the water edge.

Description

[0001] WITTEWELLER

[0002] Applicant: October 6, 2025

[0003] Brand Guides Markenberatung GmbH & Co. KG 5319P100WO - MW / MW

[0004] Steilshooper Strasse 112

[0005] 22305 Hamburg

[0006] Surf facility for standing waves

[0007] The present disclosure relates to a virtually ubiquitously applicable, in particular mobile (i.e. transportable), surfing facility for generating a surfable standing wave (simulator for wave water sports, such as surfing, bodyboarding, flowboarding, etc.), especially in a (e.g. permanently installed) swimming pool, in a lake; in a river or the like, as well as a corresponding surfing facility.

[0008] WO 2023 / 280375 A1 describes a modular, mobile surfing facility for simulating a surfable standing wave. Key modules of the facility are: i) a pump cell designed to generate a laminar, layered water flow; ii) a radial pump (instead of a conventional axial pump) that can be operated in a horizontal position, thus requiring less water to be stored in a basin; iii) a diffuser coupled to the pump to increase the cross-sectional area of ​​the water jet and create a wide, flat flow; iv) a (mobile) water basin; and v) an inflatable support structure floating in the basin that carries and holds an inclined membrane onto which the water jet is directed and on which the surfer stands or surfs.

[0009] The radial pump creates a surfable water current with a speed typically below 30 km / h, resulting in lower noise levels, particularly in a lower frequency range that is perceived as more pleasant. The entire surfing system is modular and specifically designed for transport in trucks or shipping containers. It consists of inflatable and easily assembled elements. The surfing surface is formed by a membrane that stretches lengthwise due to the water flow. This membrane is attached to an inflatable support structure that floats in a (mobile) basin or pool. The radial pump and diffuser ensure a smooth, turbulence-free water flow, thus simulating the conditions for realistic wave riding.

[0010] A potential disadvantage of the surfing system in WO 2023 / 280375 A1 is its modular design. While this offers an advantage in terms of mobility, it can lead to increased assembly and disassembly effort in practice, particularly because the support structure, pump, and diffuser must be assembled and correctly aligned. The pump is heavy and not self-priming, making its positioning and commissioning in the water basin challenging, and there is a risk of pump damage if it draws in air due to incorrect commissioning. Although the system is mobile, it still requires considerable space for setup (e.g., for the large basin and the inflatable structure) and a large volume of water (e.g., a 35,000-liter water reservoir), which can pose logistical challenges when planning events or temporary installations. A sea freight container is required for transporting all the modules.Installing this system in a private or public swimming pool (indoor or outdoor) is only possible with special precautions, such as sectioning off and closing off large areas of a public pool. Positioning the pump directly in the pool could be rejected by swimmers due to noise pollution (especially underwater) and concerns (perceived risk of suction). Furthermore, the system is generally too large for use in private pools. The purchase price is also typically too high for private use, as the inflatable support structure significantly increases the cost.

[0011] The term "swimming pool" refers to an artificially constructed facility designed for swimming, bathing, or other water sports in a water-filled basin. Swimming pools are often built in leisure facilities, hotels, sports complexes, or even in private homes. A central element of a swimming pool is the pool itself, which can come in various sizes and shapes. This pool can vary in depth and is usually made of materials such as concrete, plastic, stainless steel, or tiles. Swimming pools are primarily used for swimming, bathing, and water sports. They are typically equipped with a water treatment system to keep the water clean and hygienic. This includes filtration, disinfection (e.g., with chlorine or ozone), and often also heating.Public swimming pools are subject to strict regulations regarding water hygiene, safety, and the regular inspection of facilities and water quality to protect the health of swimmers. Operators of public swimming pools, especially indoor pools, would like to offer their patrons a surfing facility, but this is often not feasible due to size and cost considerations. Public acceptance can also play a significant role.

[0012] Other mobile surfing facilities are described by way of example in the documents US 2017 / 0 136 373 A1 and US 10 501 953 B2.

[0013] It is therefore an objective of the present disclosure to provide a surfing system that overcomes the aforementioned disadvantages, in particular by: being smaller in size; and / or requiring fewer or smaller modules. Furthermore, it would be desirable to use a radial pump as the main pump, which is operated outside the pool, regardless of its orientation. It would also be desirable if existing swimming pools could be retrofitted to offer a standing wave in addition to normal pool operation. In this case, it would be particularly desirable if the standing wave could be used in the pool only as needed, i.e., not permanently. This objective is achieved by a surfing system for generating a water flow for a surfable standing wave in a pool, which can be permanently installed and which, when filled with water, defines a waterline.which corresponds to a water level in the pool, wherein the surfing facility comprises: a main pump for generating the water flow, the main pump being a radial pump which, particularly during the generation of the water flow, is located outside the pool, either mobile or fixed, and above the waterline; a suction line connected to the main pump, the inlet of which is positioned below the waterline during operation of the main pump, the main pump being, in particular, a check valve and configured to establish a water-conducting connection between the main pump and the pool; a pre-supply pump configured to flood the main pump and the suction line with water; a diffuser connected upstream to the main pump and having a downstream outlet opening which has a larger, in particular wider and shallower,a cross-sectional area serving as an outlet opening for the main pump; and a closing device designed to block the outlet of the water flow from the diffuser (until) the main pump is (fully) flooded (and in particular until a (water) pressure required for the standing wave has built up in the main pump).

[0014] In one variant, the main pump is located above the waterline, and the surfing system can be either mobile or a stationary retrofit kit.

[0015] The main pump, a centrifugal pump, can be positioned outside the pool. In other words, the main pump does not need to be submerged to create the standing wave. Swimmers are less disturbed by the pump. Swimmer acceptance is higher because they don't have to be afraid. Because the pump doesn't need to be submerged, the centrifugal pump can be operated vertically or horizontally. This means there are no special requirements regarding the centrifugal pump's orientation.

[0016] In a mobile configuration of the surf system, the main pump, the pre-suction pump, the suction line, the diffuser, and the shut-off device are easy to transport, position (relative to the pool), and put into operation. No specialist is required for transport, positioning, and commissioning. In other words, the operator of the surf system does not need any special expertise. Anyone can operate the surf system.

[0017] The surfing system can be used temporarily in a swimming pool, lake, river, or similar body of water. It can be set up and then dismantled as needed, allowing for uninterrupted operation of the pool. The system can also be retrofitted into existing swimming pools, increasing their appeal. Retrofitting is simple and cost-effective.

[0018] Because of its positioning outside the basin, the radial pump is easier to maintain. The shut-off device protects the main pump from overpressure during start-up and can also improve water flow control.

[0019] Furthermore, the task is solved by a permanently installed surfing system to generate a (layered) water flow for a surfable standing wave, whose main pump is positioned below the waterline, in particular in a remote (e.g. underground) engine room.This surfing facility comprises: a basin, in particular one that can be permanently installed, which, when filled with water, in particular completely, defines the waterline corresponding to a (visible) water level in the basin; a main pump for generating a water flow for the standing wave, wherein the main pump is a radial pump located outside the basin and below the waterline; a suction line connected to the main pump, the inlet of which is positioned below the waterline; and a diffuser connected to the main pump, which has an outlet opening with a larger, in particular wider and flatter, cross-sectional area than an outlet opening of the main pump, the outlet opening of the diffuser being positioned above the waterline.In the second variant, the main pump is located below the waterline, with the surfing system typically installed permanently in an existing swimming pool. Because the main pump is positioned below the waterline, it can be completely submerged in water (permanently and automatically) due to Archimedes' principle, eliminating the need for a pre-priming pump. A shut-off valve is also not strictly necessary, as the main pump is completely filled with water at the outlet as well. Positioning the main pump below the waterline prevents air pockets that could impair the pump's efficiency.

[0020] In a permanently installed configuration of the surfing system, the main pump can also be located remotely from the pool. Existing machine rooms can be used to position the main unit, especially if the surfing system is being retrofitted into an existing swimming pool. Existing piping can be used for the suction line, eliminating the need for the pre-suction pump and the shut-off device.

[0021] Swimming pool operators can therefore retrofit a standing wave system in addition to regular pool operation with relatively simple means, without having to undertake costly renovations or invest large sums of money. In some cases, existing pumps can even be used.

[0022] Preferably, the surfing system of the second variant further comprises: a pre-suction pump designed to continuously supply the main pump and / or the suction line with water, so that during continuous operation of the main pump there is always enough water in the suction line to enable continuous operation of the main pump; and / or a shut-off device designed to block the escape of water flow from the diffuser until the main pump is flooded.

[0023] The continuous water supply via the pre-suction pump ensures that the

[0024] The main pump does not run dry during continuous operation, which increases the pump's lifespan and reliability. The shut-off device facilitates starting the main pump by allowing pressure to build up before the system starts operating.

[0025] Especially when the distance between the basin and the main pump is very large, there is a risk that the required operating pressure cannot be achieved or maintained by the main pump, so the pre-priming pump is used to assist. A similar situation can arise with the shut-off device while the operating pressure is being built up in and by the main pump.

[0026] Preferably, the surf facility also includes a surfing surface, in particular a mat, which is inflatable and preferably made of a drop-stitch material.

[0027] The surfboard is lightweight and easy to transport. It floats on the water. The material is dimensionally stable yet soft, giving the surfer an authentic surfing feel. The material offers high stability and strength at a low weight, making it ideal for a permanently uneven surfboard surface.

[0028] Preferably, the surfing surface is designed to rise in a vertical direction with respect to the direction of the water flow exiting the diffuser, in particular by having a wedge shape in a side view.

[0029] The rising surface of the surfboard creates a balance of forces between the emerging water jet and the surfer's weight. The surfer remains stationary and is not blown off the surface. This results in an authentic surfing experience.

[0030] These conditions are realistically simulated by a (wedge-shaped) rising surface, in particular by imitating the angle of the wave and directing the water flow in the correct direction.

[0031] Preferably, the surfing system further comprises: a fixing device for securing the surfing surface to: the main pump; the diffuser; and / or the pool. Securing the surface to the pump or diffuser is simple and can be carried out by personnel without specialized training. The fixing process is technically straightforward and functionally reliable. The surface does not change its distance from the diffuser, so the desired flow conditions (at the surfer's location) remain unchanged.

[0032] The surfboard remains fixed in position. This means that the surface does not move away from the pump due to the exiting water jet. The fixing device ensures that the surface is stably and securely attached, which also improves wave consistency.

[0033] Preferably, the fixing device comprises: a rod that can be inserted laterally into a channel-like receptacle, which is attached to the surfing surface substantially perpendicular to an exit direction of the water flow from the diffuser; and at least one retaining arm, which is configured to hold the surfing surface firmly spaced apart from the outlet opening of the diffuser along the exit direction, and which has an opening at a downstream end that receives the rod in a form-fitting manner, wherein the receptacle of the surfing surface preferably has an opening through which the retaining arm enters the receptacle from the outside.

[0034] Preferably, the surfing system also has a support frame on which at least the main pump is directly mounted, with the outlet opening of the diffuser being arranged in a height range of 10 to 30 cm above the waterline.

[0035] The support frame simplifies transport. All components can be (pre-)assembled on the frame and are therefore transportable and positionable as a unit.

[0036] Preferably, the support frame is designed to be transported with a mobile lifting device, which is particularly designed for transporting pallets.

[0037] The (mobile) surfing system can be easily transported, and conventional lifting and transport equipment can be used in particular. Preferably, only the main pump is directly connected to the support frame, with the pre-suction pump being directly connected to the suction line or arranged directly with the main pump, between the main pump and the suction line, with the closing device being arranged downstream of the main pump, and with the diffuser being arranged downstream of the closing device.

[0038] There is only one connection between the components of the mobile surfing system and the support frame: the main pump, to which all other components are aligned and attached. This measure also simplifies the transport and setup of the surfing system.

[0039] The support frame or its optical covering can be padded and / or rounded at relevant points to reduce impact forces and consequences in the event of collisions with the surfer.

[0040] Preferably, the closing device comprises a (plate) slide that is configured to be moved linearly vertically from bottom to top in order to open a section of pipe provided between the main pump and the diffuser.

[0041] The vertical (rather than rotating) opening prevents air from entering the main assembly on the outlet side. The water remains stationary in the pipe. When the valve is moved vertically upwards, only water flows downstream from the main pump. No air is drawn in.

[0042] Preferably, the diffuser has a sloping section, such that the outlet opening is arranged vertically lower than an inlet opening of the diffuser.

[0043] The sloped section improves water flow by gently directing the water onto the surfing surface without significant turbulence. The water jet emerges directly (vertically) above the surfing surface. The water flow strikes the surface almost tangentially. Turbulence is avoided. The full energy of the water jet remains within the water flow.

[0044] Preferably, the surfing facility also has a control system which is preferably configured to carry out the procedure described below.

[0045] The problem is further solved by a method for operating one of the surfing facility(ies) described above, comprising the following steps: i.) closing the closing device; ii.) operating the pre-suction pump, at least until the main pump is completely flooded; iii.) starting the main pump to build up an operating pressure in the main pump sufficient to generate the (constant) water flow required for the standing wave, in particular while, by means of the main pump, water is drawn from the pool via the suction line; and iv.) opening the closing device when the operating pressure has built up.

[0046] A gradual start-up of the pump prevents sudden pressure spikes that could damage the system and ensures a stable build-up of the water flow.

[0047] The timely opening and closing of the closing device ensures that the main pump is completely filled with water and that the required operating pressure can build up in the main pump to continuously supply the standing shaft with the water flow without flow interruptions or a collapse of the water flow.

[0048] Preferably, the locking device opens completely within a period of several seconds, in particular only after 10 s.

[0049] This ensures that no flow separation occurs during the opening process.

[0050] It is understood that the features mentioned above and those to be explained below can be used not only in the combinations specified, but also in other combinations or on their own, without leaving the scope of this disclosure.

[0051] One or more embodiments of the present disclosure are illustrated in the drawings and are explained in more detail in the following description. They show:

[0052] Fig. 1 shows a surfing facility according to a mobile configuration in a side sectional view (Fig. 1A) and in a top view (Fig. 1B);

[0053] Fig. 2 is a block diagram of the surf facility;

[0054] Fig. 3 a perspective view of a pump unit of the mobile surfing system of Fig. 1;

[0055] Fig. 4 shows a side view of a mat used in the surf facility of Fig. 1;

[0056] Fig. 5 is a sectional view of the mat of Fig. 4 along a line AA in Fig. 4;

[0057] Fig. 6 shows an enlarged detail view of the mat in Fig. 4;

[0058] Fig. 7 shows a flowchart of a method for operating the surfing facility of Fig. 1;

[0059] Fig. 8 shows a schematic side view of permanently installed configurations of the surfing facility; and

[0060] Fig. 9 shows a perspective view of a slide valve.

[0061] Fig. 1 illustrates a surfing system 10 in a mobile configuration, with Fig. 1A showing a sectional side view and Fig. 1B showing a top view of the surfing system 10 of Fig. 1A. Fig. 2 illustrates a block diagram of the mobile surfing system 10. Figs. 1A, 1B, and 2 will be described together below. The surfing system 10 is generally designed to generate a water flow 11—preferably layered—for a surfable standing wave, particularly in a swimming pool, lake, river, or similar body of water, which includes a basin 12—in particular, a stationary one. The surfing system 10 could also be operated while mounted on a truck and extending into a water reservoir. When filled with water 14, the basin 12 defines an (upper) waterline 16, which corresponds to the (visible) water level 14 in the basin 10. The waterline 16 describes in particular a highest water (fill) level in the basin 12, i.e.h. a level at which the water 14 e.g. flows into a circumferential channel to maintain a constant water level.

[0062] The surfing system 10, in its mobile configuration, comprises in particular: a main pump 18; a suction line 20; a pre-suction pump 22 (see also Fig. 3); a diffuser 24; and a closing device 26. The surfing system 10 may further comprise at least one of the following components: a surfing surface 28; a fixing device 30; and / or a (support) frame 32.

[0063] The main pump 18 is a radial pump 19. The main pump 18 is designed to generate the water flow 11, which is particularly layered and has a constant flow rate. The main pump 18 can be operated in a vertical or horizontal orientation. In Fig. 1, the main pump 18 is shown by way of example in a horizontal orientation, in which the water 14 enters the pump housing vertically from below and exits the pump housing horizontally to the side.

[0064] In the mobile configuration, the main pump 18 is located outside the basin 12, either mobile or permanently installed, and (vertically) above the waterline 16. Generally, the radial pump 19 operates at speeds that result in a low noise level. The water flow 11 exits without (internal) turbulence, unlike axial pumps. The radial pump 19 is a centrifugal pump in which the pumped medium (here: water 14) exits radially, i.e., perpendicular to a pump shaft oriented vertically in Fig. 1 (not illustrated), from a (horizontally oriented) impeller. In contrast to axial pumps, flow deflection within the impeller allows the use of centrifugal force for higher delivery pressures, although the volume flow rate is correspondingly reduced.Under normal operating conditions, the medium to be pumped enters the main pump 18 via the suction line 20, is captured by the rotating impeller, and carried outwards in a spiral path. Due to the widening of the area between the impeller blades (not illustrated), the radial velocity of the water 14 decreases towards the outside, while simultaneously the tangential velocity – and thus the pressure – increases. The main pump 18 comprises a motor 34, a (shaft) coupling, and an impeller (not illustrated). The impeller, i.e., the impeller, is arranged within a spiral-shaped (pump) housing. The housing has a circular section radially inwards, to which a spiral section extends radially outwards.The pressure and momentum (mass times tangential velocity) of the impeller propel the accelerated water 14 into a tangentially oriented section of the housing, to which an end section is attached. This end section allows the resulting water jet to exit parallel to the X-direction with, for example, a circular cross-section (diameter, for example, 150 mm). The diffuser 24 is connected to an outlet opening of the main pump 18 with its (tight) inlet opening to i.) change the cross-section of the water jet from, for example, circular to rectangular and, if necessary, ii.) overcome a height difference between the outlet opening of the main pump 18 and the surfing surface 28. The cross-section of the diffuser 24 can change, as already described in WO 2023 / 280375 A1.

[0065] The suction line 20 can be directly connected to the main pump 18. Alternatively, the suction line 20 can be indirectly connected to the main pump 18 by placing the pre-suction pump 22 between them. The suction line 20 can be an S-shaped pipe in a side view, the outlet of which connects to the main pump 18 and the inlet (suction opening) of which extends into the basin 12 to draw in the water 14 during normal operation. The inlet of the suction line 20 is positioned below the water level 16 during normal operation. A check valve 36 (not illustrated), e.g., a non-return valve, can be provided in a downstream end section of the suction line 20 that includes the inlet; its function will be described in more detail below. The suction line 20 is designed to establish a water-conducting connection between the main pump 18 and the (filled) basin 12.

[0066] The check valve 36 is designed to allow the flow of water 14 in only one direction. The check valve 36 prevents the water 14 from flowing back in the opposite direction, i.e., into the basin 12. The check valve 36 operates automatically and requires no manual or external control. When the water 14 flows towards the main pump 18, the check valve 36 opens. This occurs due to the pressure of the flowing water 14 acting on an internal movable component of the valve 36, such as a flap, ball, or diaphragm. This component is forced into the open position by the pressure, allowing the water 14 to pass through. If the pressure on the inlet side decreases or the water 14 begins to flow in the wrong direction, the valve 36 closes automatically. This can happen either by gravity, return springs, or the back pressure of the water 14 itself. The movable component (flap, ball, etc.)) closes the valve seat, thus preventing backflow. Valve 36 therefore operates without external intervention. Valve 36 prevents damage and malfunctions, especially of the main pump 18.

[0067] The pre-priming pump 22 is configured to flood the main pump 18 and the suction line 20 with water 14 from the pool 12. This flooding occurs particularly during the initial or commissioning phase of surfing operations, as will be explained in more detail later. The pre-priming pump 22 is a type of pump that ensures the suction line 20 of the main pump 18 is filled with water 14 before the main pump 18 can begin its actual pumping operation. This is especially important because centrifugal pumps are not self-priming. Therefore, the main pump 18 relies on the suction line 20 and the pump housing being completely filled with water 14 to ensure proper functioning.

[0068] The pre-priming pump 22 can be operated as follows. The pre-priming pump 22 is activated upstream of the main pump 18, e.g., by a controller 38 (see Fig. 2), and draws the water 14 from the basin 12. The water 14 is passed through the suction line 20 and through the pump housing of the main pump 18. This prevents air bubbles from remaining in the system, which could impair the operation of the main pump 18. The pre-priming pump 22 ensures that there is always enough water 14 in the suction line 20 during operation of the main pump 18 to enable continuous operation. Once the main pump 18 is filled with water 14 and ready to start, the pre-priming pump 22 can be switched off, as the main pump 18 will then be able to continue the pumping process on its own.If the basin 12 is located far from the main pump 18, the pre-priming pump 22 can help bridge the distance and ensure that the main pump 18 is continuously supplied with water 14. Smaller centrifugal pumps are often used as pre-priming pumps, delivering a small quantity of water 14 at low pressure to fill the suction line 20 of the main pump 18. Alternatively, diaphragm pumps or piston pumps can also be used.

[0069] The closing device 26 is designed to prevent the water flow 11 from exiting the diffuser 24 by blocking the water flow 11, for example, downstream towards the main pump 18 and upstream towards the diffuser 24. The blockage serves the purpose of completely flooding the main pump 18, as mentioned above, particularly until the (internal) water pressure required for the standing wave has built up in the main pump 18.

[0070] The closing device 26 can be a so-called plate gate valve 40, which will also be referred to simply as "gate valve" below and is shown in Fig. 9. The plate gate valve 40 is a shut-off device in a water supply system. The gate valve 40 is used to shut off or regulate the flow of water 14. The gate valve 40 functions by (vertically) raising and lowering, cf. arrow 44 in Fig. 9, a flat, rectangular or round plate 42, which is moved transversely to the direction of flow and which allows or interrupts the water flow. The plate 42 can be lowered or raised in a slot 46 in a pipe section 48. When the plate 42 is fully lowered, it blocks the water flow. The movement of the plate 42 can be either manual (e.g., by a handwheel or a lever) or automatic (e.g., by an electric or hydraulic actuator 49).The gate valve 40 is often equipped with one or more seals 50 to ensure that no water 14 escapes when the plate 42 is in its closed position. Gate valves 40 are ideal for shut-off functions, especially where controlled (slow) opening and closing of the flow is required. In an open position, the gate valve 40 causes minimal flow resistance because the plate 42 is completely removed from the water flow. The movement of the plate 42 is slower compared to other valve types, making it suitable for preventing pressure collapse during the start-up of the main pump 18.

[0071] Fig. 1B shows a top view of the mobile surfing system 10 of Fig. 1A and serves in particular to illustrate exemplary proportions. The surfing surface 28 has a length L1 in the longitudinal direction X and a width B1 in the transverse direction Z. The longitudinal direction X, the transverse direction Z, and the vertical direction Y preferably define a Cartesian coordinate system. The length L1 is preferably up to 7 m or more. The width B1 can be up to 3 m or more.

[0072] Fig. 1B further illustrates that the main pump 18 is positioned above the edge 16. The main pump 18 is positioned outside the pool 12. The suction line 20 can be shaped and dimensioned so that the water 14 can be pumped from the pool 12 in the longitudinal direction X in front of the surfing surface 28. The suction line 20 extends below the water edge 16 in the vertical direction Y. One inlet end of the suction line 20 can be surrounded by a protective cage 52, which may be of a grid-like design, to protect the surfer 82 (not illustrated, see Fig. 8) from injury by suction. The surfing surface 28 preferably floats on the water 14 in the pool 12, particularly if the surfing surface 28 is designed as a mat 56, as will be explained below. The diffuser 24 is shown in Fig.1 B is provided with an exemplary sloping section (gradient section) to allow the water flow 11 to exit at the level of, and in particular directly above, the surfing surface 28. An exit direction 54 of the water flow 11 is essentially parallel to the longitudinal direction X, disregarding the divergence caused (and desired) by the diffuser 24.

[0073] The Mat 56 can be inflatable. It offers a soft, air-filled surface that is both soft and flexible, providing a supportive surface for the surfer. The Mat 56 conforms well to the shape of its surroundings. It yields when the surfer applies pressure, enhancing the surfing experience. The Mat 56 is lightweight and therefore easy to transport, making it a practical solution for temporary installations. The air pressure in the Mat 56 can be adjusted to regulate firmness or softness, depending on the surfer's needs. The Mat 56's soft, springy surface can reduce the risk of injury. The Mat 56 can be manufactured using a drop-stitch process, in which thousands of vertical (polyester) threads are stretched between the upper and lower layers of material. These threads maintain a fixed distance between the top and bottom of the inflatable Mat 56.Once the mat is inflated, these threads tighten, ensuring the surface remains rigid and stable, similar to a solid material. The drop-stitch material can be inflated to very high pressure (typically up to 20 PSI or more), resulting in a very stiff and stable structure. Despite its robustness, the material can be deflated and easily transported because it folds up. The drop-stitch material is extremely durable, offering high wear resistance and longevity.

[0074] The mat 56 of Fig. 1 is illustrated in an isolated side view in Fig. 4. A wedge 58 can be provided in a downstream area of ​​the mat 56, which can be positioned below the mat 56 and causes the mat 56 to rise vertically. The wedge 58 prevents the surfer 82 from being pushed down off the mat 56 by the water current 11. The water current 11 pushes the surfer 82 upwards against the wedge 58. Due to gravity, the surfer 82 moves downwards. This results in a balance of forces, which ensures that the surfer 82 is "standing on the wave".

[0075] The wedge 58 can, for example, be located 3.5 to 4 m downstream from the beginning of the mat 56 (see length L3). The wedge 58 itself can, for example, be approximately 2 m long (see length L4). A non-inclined end section of the mat 56 can be approximately 50 cm long (see length L5). The wedge 58 can have a substantially triangular cross-section (a side view of Fig. 4). The height H1 of the wedge 58 can be up to 50 cm. The mat 56 preferably has a thickness or height H2 of 10 cm.

[0076] The wedge 58 can have two side flanges 60 that guide and center the mat 56 in the transverse direction Z, cf. Fig. 5, which illustrates a sectional view along a line AA in Fig. 4. For this purpose, the side flanges 60 can project beyond a main body 62 of the wedge 58 in the vertical direction Y. The side flanges 60 and the main body 62 can positively engage the mat 56 between them. The wedge 58 is preferably also made of a self-floating material.

[0077] As shown in Fig. 6, which illustrates an enlarged view of area VI in Fig. 4, the wedge 58 can be (removably) fixed to the mat 56. A keder rail 64 can be attached to the underside of the mat 56, into which a rod 66 can be inserted in a form-fitting manner in the transverse direction Z. A film 68 can be attached to the rod 66 – across the entire width B1 of the mat 56 – on which the wedge 58 can be positioned. On the downstream side of the wedge 58, another keder rail 64 can be attached to the underside of the mat 56 to accommodate another rod 66, to which the film 68 is also attached.

[0078] It is understood that the surfing surface 28 can be implemented by a membrane (not illustrated) that is designed in a trampoline-like manner and that is fixed – preferably resiliently – to the edge of the pool 12, to the ground outside the pool 12 and / or to the frame 32. The membrane is also to be oriented vertically upwards, at least partially, downstream.

[0079] Fig. 2 shows a block diagram of the mobile surfing system 10, which is configured for use in an existing swimming pool with a built-in basin 12. The movement of water 14 between the various components of the mobile surfing system 10 is indicated by light arrows. Components positioned outside the basin 12 – and thus in the air 70 – are shown in Fig. 2 above the waterline 16. It is understood that the components of the surfing system 10 in Fig. 2 can also be arranged differently with respect to their position "above / below the waterline 16" or "in the water 14 / in the air 70".

[0080] Fig. 3 shows a perspective view of a mobile pump unit 72, which is also used in Fig. 1. The pump unit 72 comprises the following components of the block diagram of Fig. 2: the frame 32; the main pump 18; the suction line 20; the diffuser 24; and the closing device 26. The pump unit 72 may optionally have a gallows 74 to which a pulley 76 may be attached for lifting objects in and out of the basin 12. The gallows 74 may be pivotally mounted. The pump unit 72 may also optionally have the fixing device 30, for example in the form of at least one holding arm 31 (cf. Fig. 1), each of which is configured to hold the surfboard 28 firmly along the discharge direction 54 towards the discharge opening 71 of the diffuser 24. Each of the support arms 31 can have an opening at its downstream end that positively receives a rod 73 (see Fig. 1B). The rod 73 can be inserted into pocket-shaped receptacles 75 (see Fig. 1B).also Fig. 1 B) are introduced, which are attached to the mat 56 on the entrance side.

[0081] The frame 32 can be equipped in a lower section for transport with a mobile device (not shown) (e.g., manual pallet truck or forklift). For this purpose, the lower section of the frame 32 can be designed in a pallet-like manner.

[0082] Furthermore, Fig. 3 illustrates that preferably only the main pump 18 is in contact with the support frame 32. In other words, all other components of the pump unit 72 are attached to the main pump 18. The diffuser 24 can be supported (vertically) on the suction line 20 and preferably projects in the longitudinal direction X beyond the downstream portion of the suction line 20. The pre-priming pump 22 can be directly connected to the suction line 20, preferably in the downstream portion of the suction line 20 (preferably upstream of the optional check valve 36, which is not illustrated). Alternatively, the pre-priming pump 22 can be directly connected to the main pump 18, so that the pre-priming pump 22 is positioned between the main pump 18 and the suction line 20. The closing device 26 can be arranged downstream of the main pump 18, with the diffuser 24 being arranged downstream of the closing device 26.

[0083] This type of support for the components on the frame 32 enables easy installation (assembly at the manufacturer's site as well as submersion by the user in the pool 12), easy transport (in the truck, on the site, to the pool edge, etc.) and stable positioning of the pump unit 72 (and the surfing surface 28) relative to the pool 12. Fig. 7 illustrates a method 100 for operating the surfing system 10.

[0084] In a first step S10, the closing device 26 is closed so that no water 14 can escape from the diffuser 24. The distance downstream of the closing device 26 from the outlet opening of the main pump 18 is irrelevant. In other words, the closing device 26 can be located, for example, immediately after the main pump 18 but before the diffuser 24. Alternatively, the closing device 26 can also be located at the outlet opening 71 of the diffuser 24. Depending on the design of the closing device 26, the corresponding closing process can take up to 10 seconds, especially if the slide valve 40 described above is used.

[0085] In the next step S12, the pre-suction pump 22 is started. The pre-suction pump 22 is operated at least until the main pump 18 is (completely) flooded and, in particular, until the required operating pressure for the vertical shaft is reached in the pumped medium (water 14). This can take up to 45 seconds, depending on the design of pumps 18 and 22.

[0086] In the next step S14, the main pump 18 is started. This is possible as soon as the main pump 18 is completely flooded. During this phase, an operating pressure builds up in the pumped medium of the main pump 18, or in the main pump 18 itself, which is sufficient to generate the water flow 11 required for the standing wave. The operating pressure is (later) preferably generated exclusively by the main pump 18, by the main pump 18 drawing water 14 from the basin 12 via the suction line 20 and simultaneously discharging the water flow 11 from the diffuser 24.

[0087] Once the operating pressure described above has built up in the main pump 18, the closing device 26 can be opened in step S16. Opening the closing device 26 causes the water flow 11 to exit the diffuser 24. The standing wave builds up in the form of a water film that flows back into the pool 18 over the surfing surface 28. This enables continuous operation of the standing wave. It is understood that the steps described above can be implemented by the controller 38, which is in signal and data communication with the components of the surfing system 10. The controller 38 causes the components to execute the steps described above. The controller 38 can be located in a control cabinet (not illustrated), which can be mounted on the frame 32. The controller 38 includes the necessary hardware and software.The procedure 100 can be described in the form of a program that is stored in a memory device of the controller 38 in order to be executed by a data processing device of the controller 38.

[0088] Furthermore, it is understood that the relevant operating parameters, such as the aforementioned duration, can also be stored in the storage device to ensure the timing described above, so that the desired operating pressure is set in the main pump 18.

[0089] Fig. 8 schematically illustrates two permanently installed variants of the surfing facility 10, in which the pool 12 is (permanently) installed in the ground (building or terrain). Fig. 8 shows a (public) swimming pool situation.

[0090] A first variant of the permanently installed surfing system 10, shown on the right in Fig. 8, is structured according to the block diagram of Fig. 2. This means that the first variant of the surfing system 10 comprises: the main pump 18; the suction line 20; the pre-suction pump 22; the diffuser 24; and the closing device 26. The suction line 20 can be connected directly to the basin 12 underground.

[0091] Optionally, a bypass line 78 can be provided, which connects the suction line to an optional water tank 80 located higher than the (above-ground) main pump 18. In this case, the pre-suction pump 22 is preferably located in the bypass line 78 to pump the water 14 from the works 12 into the tank 80. Once the tank 80 is sufficiently filled to completely flood the main pump 18, the pre-suction pump 22 can be switched off and the bypass line 78 can be disconnected from the suction line 20 via a valve (not shown). The closing device 26 remains closed during this process. The main pump 18 is then flooded with the water from the tank 80 and subsequently put into operation. Once sufficient pressure has built up for the standing wave, the closing device 26 is opened, allowing the water flow 11 to exit the diffuser 24 and enabling the surfer 82 to surf on the standing wave.The Diffuser 24 can be permanently integrated into a pool edge. The Diffuser 24 does not necessarily need to have a slope. However, the Diffuser 24 should have the required change in cross-section, as explained above.

[0092] Alternatively, in the first variant of the permanently installed surfing system 10, the bypass line 78 and the tank 80 can be omitted if the pre-suction pump 22 is integrated directly into the suction line 20, for example.

[0093] The first variant of the permanently installed surfing system 10 is characterized by the fact that the main pump 18 is positioned above the water edge 16.

[0094] According to a second variant of the permanently installed surfing system 10, which is schematically illustrated on the left in Fig. 8, the main pump 18 is positioned below the waterline 16, e.g., in an engine room 84. The surfing system 10 of the second permanently installed variant comprises: the main pump 18; the suction line 20; and the diffuser 24. In other words, this means that the surfing system 10 of the second variant does not necessarily include the pre-supply pump 22 and / or the closing device 26.

[0095] Engine room 84 can be positioned remotely from basin 12. Engine room 84 can be located underground. Engine room 84 is connected to basin 12 (indirectly) via intake pipe 20.

[0096] Depending on the length of the suction line 20, the pre-suction pump 22 can be installed between the main pump 18 and the basin 12, either in or on the suction line 20. If the suction line 20 is too long, there is a risk that the capacity of the main pump 18 will not be sufficient to maintain the required suction pressure continuously during operation of the standing shaft. It is also advantageous to position the shut-off device 26 downstream of the main pump 18 to ensure that the operating pressure of the main pump 18 is reliably reached, particularly during the initial start-up phase. If the connection between the main pump 18 and the diffuser 24 is made without the shut-off device 26, the main pump 18 will be permanently flooded because the water 14 will be at the level of the water hardness 16 in the connecting pipe.However, as soon as the main pump 18 starts operating, water 14 escapes via the diffuser 24, so that the required operating pressure may never be reached. This depends in particular on the geometric conditions (distance between basin 12 and main pump 18 as well as distance between main pump 18 and diffuser 24).

[0097] In Fig. 8, the pre-suction pump 22 and the closing device 26 are not shown in the second permanently installed variant, although they may be present.

[0098] Figure 8 illustrates that the surfing system 10 can also be implemented as a retrofit kit to install a standing wave in existing swimming pools. These pools already contain many of the components required for implementing the surfing system 10. For example, conventional swimming pools often already use so-called waterfall showers, which place similar technical demands on the water supply and pump systems.

[0099] It is understood that the surfing surface 28 shown in Fig. 8 is also retrofitted into an existing swimming pool. The surfing surface 28 can be implemented in the form of the mat 56 described above or in the form of a membrane.

[0100] In another embodiment of the surfing system 10, not illustrated, the main pump 18 can be arranged not vertically, but at an angle, e.g., at an angle of approximately 45 degrees to the vertical. This inclination allows the housing of the main pump 18 to partially fill with water 14 without additional aids, in particular up to about one-third of its internal volume. This supports and accelerates the flooding process. The energy required for complete flooding is thereby reduced, and the start-up process of the surfing system 10 becomes simpler and more reliable overall.

[0101] The previously described (water-based) pre-priming pump 22 can be configured as an air / water vacuum pump, which is preferably designed as a diaphragm pump and is ideally located in the upper part of the line, i.e., upstream of the closing device 26. The air / water vacuum pump is configured to extract air from inside the main pump 18 and from the subsequent section of the line up to the closing device 26 during a commissioning phase. The extraction of air creates a negative pressure in this area, which draws the water 14 from the basin 12 through the suction line 20 into the housing of the main pump 18. This completely floods the pump 18 and the associated line sections with water 14, while simultaneously reliably removing any trapped air bubbles.Once the pump housing is completely filled, the operation of the air / water vacuum pump can be stopped, and the main pump 18 can begin the pumping process.

[0102] During the flooding phase, the closing device 26 remains closed to prevent backflow or premature discharge of the water 14 from the main pump 18. The closing device 26 can be configured as a gate valve or, alternatively, as a flap valve and serves to seal the area to be flooded up to the outlet opening 71. Only after the housing of the main pump 18 is completely flooded and the required operating pressure has been established does the closing device 26 open, thereby releasing the water flow 11. The basic procedure of the flooding process thus corresponds to the previously described procedure, with the function of the pre-suction now being performed by the air / water vacuum pump.

[0103] The check valve 36 on the intake side can be omitted. The negative pressure generated by the air / water vacuum pump prevents the water 14 from flowing back into the basin 12 as long as the closing device 26 is closed. A separate check valve 36 is therefore not strictly necessary. This simplifies the construction of the surfing system 10 and improves the flow conditions in the intake line 20. Furthermore, moving components in the water flow are avoided, which increases operational reliability and reduces maintenance.

[0104] The combination of the inclined arrangement of the main pump 18, the use of an air-based priming device 22, and the retained closing mechanism 26 results in a particularly reliable and low-maintenance surfing system 10. The system is flooded more quickly and evenly, the risk of air entrapment is minimized, and the main pump 18 starts without cavitation or pressure surges. The elimination of the check valve 36 and the use of a water-based priming pump reduces the number of components, making the overall system lighter, more compact, and quieter. The surfing system 10 is therefore equally suitable for stationary and mobile applications.

[0105] In this variant, the method 100 for operating the surfing facility 10 can be adapted so that the main pump 18 is not flooded by the water-carrying pre-suction pump 22, but by the air / water vacuum pump described above. In this case, the method includes, in particular, the following steps: i.) Closing the shut-off device 26 to seal the area to be flooded up to the outlet opening 71; ii.) Activating the air / water vacuum pump 22 to extract air from inside the main pump 18 and from the downstream line up to the shut-off device 26, thereby allowing the water 14 from the basin 12 to enter the main pump 18; iii.) Stopping the operation of the air / water vacuum pump as soon as the main pump 18 is completely filled with water 14; iv.) Starting the main pump 18 to build up the required operating pressure; and v.) Opening of the closing device 26 as soon as the operating pressure is reached and the water flow 11 can be generated stably.

[0106] This procedure ensures a gentle start-up of the surf facility 10, prevents pressure peaks and air inclusions, and ensures that the water film required for the standing wave is generated continuously and evenly.

[0107] Reference list: 10 Surf facility

[0108] 11 Water flow

[0109] 12 (water) pools

[0110] 14 Water

[0111] 16 Waterline

[0112] 18 Main pump

[0113] 19 Radial pump

[0114] 20 Intake pipe

[0115] 22 Suction pump

[0116] 24 Diffuser

[0117] 26 Locking device

[0118] 28 surfing area

[0119] 30 Fixing device

[0120] 31 Support arm

[0121] 32 (support) frames

[0122] 34 Engine

[0123] 36 Check valve

[0124] 38 Control

[0125] 40 plate slides / slides

[0126] 42 plate

[0127] 44 Movement of 42

[0128] 46 slots

[0129] 48 Pipe section

[0130] 49 Drive

[0131] 50 Seal

[0132] 52 protective cages

[0133] 54 Exit direction

[0134] 56 mats

[0135] 58 wedge

[0136] 60 side cheek

[0137] 62 Main body

[0138] 64 Keder rail

[0139] 66 rods 68 foil

[0140] 70 air

[0141] 71 Exit opening of 24

[0142] 72 Pump unit 73 Rod of 30

[0143] 74 gallows

[0144] 75 bag(s) at 56

[0145] 76 cable pull

[0146] 78 Bypass line 80 Water tank

[0147] 82 surfers

[0148] 84 Engine room

[0149] 100 procedures

Claims

REQUIREMENTS 1. Surfing system (10) for generating a water current (11) for a surfable standing wave in a pool (12) which, when filled with water (14), defines a water edge (16) corresponding to a water level (14) in the pool (12), the surfing system (10) comprising: a main pump (18) for generating the water current (11), the main pump (18) being a radial pump (19) located outside the pool (12) and above the water edge (16); a suction line (20) connected to the main pump (18) with its inlet opening positioned below the water edge (16) during operation of the main pump (18); a pre-supply pump (22) configured to flood the main pump (18) and the suction line (20) with the water (14); a diffuser (24) connected to the main pump (18) and having an outlet opening (71) with a larger cross-sectional area than an outlet opening of the main pump (18);and a closing device (26) designed to block the outlet of the water flow (11) from the diffuser (24) until the main pump (18) is flooded.

2. Surfing facility (10) for generating a water flow (11) for a surfable standing wave comprising: a basin (12) which, when filled with water (14), defines a water edge (16) corresponding to a water level (14) in the basin (12); a main pump (18) for generating the water flow (11) for the standing wave, wherein the main pump (18) is a radial pump (19) located outside the basin (12) and below the water edge (16); a suction line (20) connected to the main pump (18) whose inlet opening is positioned below the water level (16); and a diffuser (24) connected to the main pump (18) and having an outlet opening (71) with a larger cross-sectional area than an outlet opening of the main pump (18), the outlet opening (71) of the diffuser (24) being positioned above the water level (16).

3. Surfing system (10) according to claim 2, further comprising: a pre-suction pump (22) configured to continuously supply the main pump (18) and / or the suction line (20) with water (14) so ​​that during continuous operation of the main pump (18) there is always enough water (14) in the main pump (18) and / or suction line (20) to enable continuous operation of the main pump (18); and / or a closing device (26) configured to block the outlet of the water flow (11) from the diffuser (24) until the main pump (18) is flooded.

4. Surf facility (10) according to one of claims 1-3, which further comprises: a surfing surface (28), in particular a mat (56) which is inflatable and which is preferably made of a drop-stitch material.

5. Surfing surface (10) according to claim 4, wherein the surfing surface (28) is configured to rise in a vertical direction (Y) with respect to an exit direction (54) of the water flow (11) from the diffuser (24), in particular by having the surfing surface (28) be wedge-shaped in a side view.

6. Surfing system (10) according to claim 4 or 5, further comprising: a fixing device (30) for fixing the surfing surface (28) to: the main pump (18); the diffuser (24); and / or the pool (12).

7. Surfing device (10) according to claim 6, wherein the fixing device (30) comprises: a rod (66) that can be inserted laterally into a channel-like receptacle which is attached to the surfing surface (28) substantially perpendicular to an exit direction (54) of the water flow (11) from the diffuser (24); and at least one retaining arm (31) which is configured to hold the surfing surface (28) along the exit direction (54) at a fixed distance from the exit opening (71) of the diffuser (24), and which has an opening at a downstream end which receives the rod (66) in a form-fitting manner, wherein the receptacle of the surfing surface (28) preferably has an opening through which the retaining arm (31) enters the receptacle from the outside.

8. Surfing system (10) according to one of claims 1 to 7, which further comprises a support frame (32) on which at least the main pump (18) is directly mounted, wherein the outlet opening (71) of the diffuser (24) is preferably arranged in a height range of 10 to 30 cm above the water edge (16).

9. Surfing system (10) according to claim 8, wherein the support frame (32) is designed to be transported with a mobile lifting device, which is particularly designed for transporting pallets.

10. Surfing system (10) according to claim 9, wherein only the main pump (18) is directly connected to the support frame (32), wherein the pre-suction pump (22) is directly connected to the suction line (20) or is arranged directly with the main pump (18), between the main pump (18) and the suction line (20), the closing device (26) is arranged downstream of the main pump (18), and the diffuser (24) is arranged downstream of the closing device (26).

11. Surfing system (10) according to one of claims 1 to 10, wherein the closing device (26) comprises a plate slide (40) which is arranged to be moved linearly vertically from bottom to top in order to open a section of pipe provided between the main pump (18) and the diffuser (24).

12. Surfing facility (10) according to one of claims 1 to 11, wherein the diffuser (24) has a sloped section such that the outlet opening (71) is arranged vertically lower than an inlet opening of the diffuser (24).

13. Surfing facility (10) according to one of claims 1 to 11, which further comprises a control system which is preferably configured to carry out the method according to one of claims 14 or 15.

14. Method (100) for operating a surfing facility (10) according to any one of claims 1 to 13, comprising the steps: i.) closing (S10) the closing device (26); ii.) operating (S12) the pre-suction pump (22), at least until the main pump (18) is completely flooded; iii.) starting (S14) the main pump (18) to build up an operating pressure in the main pump (18) sufficient to generate the water flow (11) required for the standing wave, in particular while, by means of the main pump (18), the water (14) is drawn from the pool (12) via the suction line (20); and iv.) opening (S16) the closing device (26) when the operating pressure has built up.

15. Method (100) according to claim 14, wherein the locking device (26) opens completely within a period of several seconds, in particular only after 10 s.

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