BATHING WATER TREATMENT SYSTEM

Description

TECHNICAL FIELD

[0001] The present invention relates to a bathing water treatment system according to the preamble of claim 1. STATE OF THE ART

[0002] For pool water treatment in public and, increasingly, private pools, an overflow channel with a balancing basin is chosen around the pool. This allows displaced pool water, also known as surge water, and the entire recirculation to be drained pressure-free via the overflow channel into the technical equipment, which is usually located below the pool water level, in a single pump circuit. The entire volume flow must then be pumped back to the pool level, plus all pressure losses. The entire geodetic pressure created by the difference in height between the overflow channel and the balancing basin is dissipated by the balancing basin down to the water level. This means that the performance of the pump used must not only compensate for all losses in the piping and filter system, but must also be sufficiently powerful to be able to transport the entire volume flow back to the pool level.In order to reduce pump performance, it was proposed in DE 20 2017 102 207 U1 and DE 20 2018 102 369 U1 to provide, in addition to the surge water equalization tank, an intermediate tank for the direct collection of surge water. This intermediate tank is connected to a filter system. The higher pressure prevails in the intermediate tank and an overflow is provided for the continuous drainage of a portion of the accumulating surge water into an equalization tank.

[0003] Due to the pressure difference between the surge water stored in the intermediate tank and the water in the filter, the surge water flows passively, i.e., without pump support, directly into the filter. Only the portion of the surge water that cannot be absorbed in the intermediate tank and therefore flows into the equalizing basin via the overflow must be pumped to the filter and / or the intermediate tank. Since both the intermediate tank and the equalizing basin are located below the pool water level, the potential energy present due to the height difference between the pool and the intermediate tank or equalizing basin is lost even with this known solution. EP0306814A1 discloses a swimming pool water treatment system according to the preamble of claim 1. DESCRIPTION OF THE INVENTION

[0004] An object of the present invention is therefore to provide a bathing water treatment system which has lower energy losses than known systems.

[0005] This object is achieved by a bathing water treatment system having the features of claim 1. Further embodiments are defined by the features of further dependent claims.

[0006] The bathing water treatment system according to the invention comprises a pool with an overflow channel for collecting bathing water and a balancing basin for receiving surge water. The invention is characterized in that a first circuit leads from the overflow channel into the balancing basin and from there via a first pump back to the pool, with the first circuit collecting bathing water in the overflow channel at a first level. A second circuit leads from the overflow channel back to the pool via a second pump. The second circuit collects bathing water in the overflow channel at a second level. The first level is higher than the second level.

[0007] A variant of the bathing water treatment system according to the invention consists in that the equalizing basin, the first pump and the second pump are arranged below the basin.

[0008] Further embodiments of the bathing water treatment system according to the invention consist in that the first and second pumps are adjusted such that a flow ratio of 1:10 to 3:10, preferably 1:10, is obtainable between the first and the total volume flow when no surge water is present.

[0009] This means that the first level is preferably positioned as high as possible so that any surge water can be absorbed by the entire overflow channel without the overflow channel overflowing.

[0010] Further embodiments of the bathing water treatment system according to the invention consist in that a filter unit is provided with a filter inlet and a filter outlet, that the filter inlet is operatively connected to both the first circuit and the second circuit, and that the filter outlet is operatively connected to the pool.

[0011] Further embodiments of the bathing water treatment system according to the invention consist in that the first circuit, seen in the flow direction in the first circuit, is operatively connected to the second circuit after the first pump.

[0012] Further embodiments of the bathing water treatment system according to the invention consist in that the second circuit, seen in the flow direction in the second circuit, is operatively connected to the first circuit after the second pump.

[0013] Further embodiments of the bathing water treatment system according to the invention consist in that the second circuit, seen in the flow direction in both the first and the second circuit, is operatively connected to the first circuit upstream of the second pump and that the second pump is operatively connected to the filter inlet.

[0014] Further embodiments of the bathing water treatment system according to the invention consist in that the second circuit, seen in the flow direction, is operatively connected to the first circuit upstream of the second pump and that the filter outlet is operatively connected to the second pump.

[0015] Further variants of the bathing water treatment system according to the invention consist in that a pressure sensor is arranged after the overflow channel in the second circuit.

[0016] Further embodiments of the bathing water treatment system according to the invention consist in that the pressure sensor is operatively connected to a control unit, which in turn is operatively connected to both the first and the second pump.

[0017] The above-mentioned design variants of the pool water treatment system can be combined in any way, provided that no contradictions arise from the combination of the design variants. This also applies to the following design variants, which will be described in detail later. SHORT DESCRIPTION OF THE CHARACTERS

[0018] Embodiments of the present invention are explained in more detail below with reference to the figures. These are for illustrative purposes only and are not to be interpreted in a restrictive manner. Fig. 1 shows a known bathing water treatment system with a single circulation circuit, Fig. 2 shows a first embodiment of a bathing water treatment system according to the invention with a first and a second circuit, Fig. 3 shows a second embodiment of a bathing water treatment system according to the invention, also with two circuits, Fig. 4 shows a third embodiment of a bathing water treatment system according to the invention, also with two circuits, and Fig. 5 shows a fourth embodiment of a bathing water treatment system according to the invention with two circuits. DETAILED DESCRIPTION OF EMBODIMENTS OF THE PRESENT INVENTION

[0019] The Fig. 1 shows a schematic representation of a known bathing water treatment system for a pool 9 (for example, a swimming pool for a public or private swimming pool) with an overflow channel 1, into which, on the one hand, displaced pool water—so-called surge water—and, on the other hand, circulating water are collected and subsequently discharged without pressure into a balancing tank 2, usually located below. A pump pumps the pool water contained in the balancing tank 2 back into the pool 9 via a filter unit 6.

[0020] The entire volume flow must therefore be pumped from the level of equalizing basin 2 back to the level of basin 9, plus all pressure losses. The entire geodetic pre-pressure (or the potential energy of the basin water at the level of basin 9) is dissipated down to the level of the water level of equalizing basin 2.

[0021] Fig. 2 shows a first embodiment of the present invention with the basin 9 and the overflow channel 1, into which circulating water and surge water are collected. According to the invention, two circuits, a first circuit 5 and a second circuit 3, lead away from the overflow channel 1. Surge water, corresponding to the water displaced by people in the basin, is fed into a balancing basin 2 via the first circuit 5.

[0022] The equalization basin 2 is located below the water level of basin 9, so no pumping power is required. A first pump 12 pumps the surge water from the equalization basin 2 toward the filter unit 6 and from there back into basin 9.

[0023] A second circuit 3, which also originates from the overflow channel 1, leads directly via an optional pressure sensor 11 into the inlet of a second pump 8, which is connected on the output side to the first circuit 5 in front of the filter unit 6, thus the surge water and the circulating water in this embodiment of the present invention flow together through the filter unit 6 and back to the basin 9.

[0024] In a further embodiment of the present invention, approximately 90% of the total circulation volume is routed via the second circuit 3 (circulation circuit). The geodetic pre-pressure (water level in the overflow channel 1) on the suction side of the second pump 8 is maintained. This is achieved by closing the second circuit 3 and not routing it via the equalizing basin 2. In the overflow channel 1, the bathing water is discharged into the second circuit 3 at a second level, wherein the second level is, for example, at the lowest point of the overflow channel 1. The second circuit 3 has a flow rate that depends on the circulation capacity of the second pump 8.

[0025] To ensure that the desired 90% of the total circulation volume is directed via the second pump 8 and thus only 10% of the total circulation volume is directed via the equalization tank 2 via the first pump 12, a control unit 14 is provided, which is operatively connected, on the one hand, to a pressure sensor 11 in the second circuit 3 and, on the other hand, to the first and second pumps 12 and 8, respectively, to control the respective pump output. The pressure measured by the pressure sensor 11 is supplied to the control unit 14, which controls the pump output of the second pump 8 in such a way that 70% to 90%, preferably 90%, of the total circulation volume is delivered via the second circuit 3. Accordingly, 10% to 30% of the total circulation volume is directed to the first circuit 5 via the equalization tank 2 and the first pump 12. This results in the following advantages: The first circuit 5 with the first pump 12 can be dimensioned smaller than is the case with known bathing water treatment systems; due to the closed second circuit 3 and the water column between the water surface in the overflow channel 1 and the suction side of the second pump 8, the latter can be dimensioned smaller and consumes less energy when operating the second circuit 3.

[0026] The position of the overflow 4 in the overflow channel 1 defines the first level and is the overflow of the first circuit 5. In one design variant, the bottom of the overflow channel 1 determines the second level and serves as the discharge of the second circuit 3 from the overflow channel 1. The usable height of the second circuit 3 defines the overflow 4 and thus the first level. Furthermore, the overflow channel 1 represents the buffer for the second circuit 3.

[0027] Via the first circuit 5 (surge water circuit), starting at the overflow 4 at a first level in the overflow channel 1, displaced bathing water (also called surge water), which overfills the second circuit 3, is drained into the equalizing basin 2. This surge water is then combined with the second circuit 3 via the first pump 12. The first circuit 5 is also operated continuously to ensure circulation through the first circuit 5 via the overflow 4 at the first higher level in the overflow channel 1 and subsequently into the equalizing basin 2. In addition, fluctuations in the overflow channel 1 can be better absorbed. The circulation capacity of the first circuit 5 corresponds, for example, to approximately 10% of the total circulation volume.

[0028] The geodetic pre-pressure can be used for the second circuit, with a difference of just a few centimeters from the pool water level. This reduces the energy requirement of the total circulation capacity by around 30%. The energy balance of a common circulation pump can be expressed as follows: At least 1 / 3 results from the geodetic height; approximately 1 / 3 from the resistance of the filter unit; approximately 1 / 3 from the resistance of the piping system and the inflow elements.

[0029] Since the discharge of the recirculated water from overflow channel 1 no longer requires a free-flowing pipe system, the pipe dimensions can be significantly reduced. These smaller pipe dimensions reduce construction costs and material requirements.

[0030] It should be noted that in a pool water treatment system, equalization tank 2 is considered the dirtiest area. With the inventive dual-circuit system, approximately 90% of the total circulation volume is bypassed, thus reducing the pool water's contact with equalization tank 2.

[0031] Since the overflow channel 1 is dammed via the first circuit 5 (surge water circuit), the noise generation in a swimming pool is considerably lower.

[0032] In addition, the advantages of the inventive bathing water treatment system compared to the known bathing water treatment system are explained in more detail below using a concrete numerical example: When using a filter unit of the pressure filter type, the known bathing water treatment system according to Fig. 1 based on the following figures: 2 m (filter resistance) + 1.5 m (piping network) + 1 m (pool inlet elements) + 4 m (geodetic height of technical floor - pool water level) - 1 m (ø pre-pressure of equalization pool) = 7.5 m.

[0033] In contrast, the bathing water treatment system according to the invention results, for example, in Fig. 2 the following figures: second circuit (circulation circuit 90%): (2 m (filter resistance) + 1.5 m (piping network) + 1 m (pool inlet elements)) - 4.5 m.

[0034] First circuit (surge water circuit 10%): 2 m (filter resistance) + 1.5 m (piping network) + 1 m (pool inlet elements) + 4 m (geodetic height of technical floor to pool water level) - 1 m (ø pre-pressure of equalization pool) = 7.5 m.

[0035] The overall balance of the inventive bathing water treatment system is as follows: 0.9 × 4.5 m + 0.1 × 7.5 m = 4.8 m

[0036] This also shows that there is a pressure advantage (and thus energy savings) of approximately 30% compared to the state of the art.

[0037] Fig. 3 shows a further embodiment of the bathing water treatment system according to the invention with a filter unit 6 of the pressure filter type. In contrast to the embodiment according to Fig. 2 is in the version according to Fig. 3 The second circuit is merged with the first circuit 5 after the first pump 12 but before the second pump 8, so that the second pump 8 conveys the entire flow rate through the filter unit 6. The advantages, in particular the reduced energy requirement for operating the bathing water treatment system, are also present in this second embodiment of the invention.

[0038] Fig. 4 shows a further embodiment of the bathing water treatment system according to the invention, in which a filter unit 13 is not a pressure filter type, but a vacuum filter type. The second pump 8 is accordingly arranged downstream of the filter unit 13, viewed in the flow direction of the operatively connected circuits, with the two circuits 3 and 5 being operatively connected directly upstream of the filter unit 13.

[0039] Finally, Fig. 5 a further embodiment of the bathing water treatment system according to the invention, in which both the first circuit 5 and the second circuit 3 lead back to the pool, wherein the equalizing tank 2 is contained together with the first pump 12 in the first circuit 5 and wherein the filter unit is contained together with the second pump and the pressure sensor 11 in the second circuit 3.

[0040] In all versions, the control unit 14, which is connected to the pressure sensor 11 and the two pumps 8 and 12, regulates the level in the overflow channel 1 by changing the flow ratio of the two circuits 3 and 5. The control is based on the pressure measured by the pressure sensor 11. REFERENCE SYMBOL

[0041] 1Overflow channel 2Compensation basin 3Second circuit (circulation circuit) 4Overflow for collecting surge water 5First circuit (surge water circuit) 6Filter unit (as pressure filter) 7Return (of the surge water circuit) 8Second pump (circulation pump) 9Basin 10Channel connection 11Pressure sensor 12First pump (surge water pump) 13Filter unit (as vacuum filter) 14Control unit

Claims

1. Bathing water treatment system comprising a pool (9) with an overflow channel (1) for collecting bathing water and a equalizing pool (2) for receiving surge water, wherein a first circuit (5) leads from the overflow channel (1) into the equalizing pool (2) and from there via a first pump (12) back to the pool (9), wherein the first circuit (5) taps bathing water in the overflow channel (1) at a first level, characterized in that a second circuit (3) leads from the overflow channel (1) via a second pump (8) back to the pool (9), wherein the second circuit (3) taps bathing water in the overflow channel (1) at a second level, and in that the first level is higher than the second level.

2. Bathing water treatment system according to claim 1, characterized in that the equalizing pool (2), the first pump (12) and the second pump (8) are arranged below the water level of the pool (9).

3. Bathing water treatment system according to claim 1 or 2, characterized in that the first level is set by means of an overflow (4), such that surge water in the overflow channel (1) can be absorbed by the first circuit (5), without the overflow channel (1) overflowing.

4. Bathing water treatment system according to one of claims 1 to 3, characterized in that a filter unit (6, 13) with a filter inlet and a filter outlet is provided, in that the filter inlet is operatively connected both to the first circuit (5) and to the second circuit (3) and in that the filter outlet is operatively connected to the pool (9).

5. Bathing water treatment system according to one of claims 1 to 4, characterized in that the first circuit (5), seen in the flow direction in the first circuit (5), is operatively connected to the second circuit (3) after the first pump (12).

6. Bathing water treatment system according to one of claims 1 to 5, characterized in that the second circuit (3), seen in the flow direction in the second circuit (3), is operatively connected to the first circuit (5) after the second pump (8).

7. Bathing water treatment system according to one of claims 1 to 5, characterized in that the second circuit (3), seen in the flow direction in both, the first and the second circuit (3, 5), is operatively connected to the first circuit (5) before the second pump (8) and in that the second pump (8) is operatively connected to the inlet of the filter unit (6).

8. Bathing water treatment system according to one of claims 1 to 5, characterized in that the second circuit (3), seen in the flow direction, is operatively connected to the first circuit (5) before the second pump (8) and in that the outlet of the filter unit (13) is operatively connected to the second pump (8).

9. Bathing water treatment system according to one of the preceding claims, characterized in that a pressure sensor (11) is arranged in the second circuit (3) after the overflow channel (1).

10. Bathing water treatment system according to claim 9, characterized in that the pressure sensor (11) is operatively connected to a control unit (14), which in turn is operatively connected to both, the first and the second pump (12, 8).