Water pump for swimming pool filter systems

Abstract

The invention relates to a water pump for swimming pool filter systems, comprising a pump unit which has an impeller housing and an impeller shaft, wherein a coupling housing is provided which has a releasable coupling for the impeller shaft and is secured to the pump unit, the pump unit being fluid-tight with respect to the coupling housing. In order to provide a water pump which facilitates easier maintenance conditions and improved adaptability to the required pump output, the impeller housing comprises a housing cover which seals the pump unit with respect to the coupling housing.

Description

[0001] for swimming pool filter systems

[0002] Technical field

[0003] The invention relates to a water pump for swimming pool filter systems comprising a pump unit having an impeller housing and an impeller shaft.

[0004] State of the art

[0005] US20180003181A1 describes a water pump comprising a motor unit, a pump unit, and a shaft connecting the two units. A disadvantage of such water pumps is that they must be disconnected from the water circuit for maintenance to prevent flooding through the open impeller housing. Additionally, if the motor unit fails, even if the pump unit remains intact, the entire water pump usually needs to be replaced. The same applies to adjusting the pump's output to meet different requirements.

[0006] Description of the invention

[0007] The invention is therefore based on the objective of proposing a water pump of the type described above, which enables easier maintenance conditions and improved adaptability to the required pumping capacity.

[0008] The invention solves the stated problem by providing a coupling housing with a detachable coupling for the impeller shaft, which is attached to the pump unit, which is fluid-tight with respect to the coupling housing. As a result of these measures, in an assembled water pump, a motor unit can be detached from the coupling housing without having to disconnect the pump from the water circuit and can then be replaced or repaired independently of location. Alternatively, a replacement motor unit can be mounted via the detachable coupling. Since the pump unit is designed to be fluid-tight with respect to the coupling housing according to the invention, such maintenance measures are not associated with the water leakage typical of prior art. In addition, the sealing rings of the impeller housing are protected, as it does not have to be repeatedly opened and closed.The impeller shaft is non-rotatably connected to an impeller located in the impeller housing, which generates a pumping effect in the pump unit through rotation.

[0009] Stable design conditions can be achieved by providing a motor unit connected to the pump unit, whose motor shaft is detachably connected to the detachable coupling, with the motor unit being supported on the pump unit via the coupling housing. This allows forces acting on the motor unit to be transferred to the coupling housing, thus preventing damage to the detachable coupling.

[0010] To facilitate the replacement of the pump unit independently of the motor unit, it is proposed that the coupling housing be detachably connected to the pump unit. This allows the coupling housing to be detached from the pump unit when switching to a larger or smaller size, while the motor unit and coupling housing remain in their installed positions. A coupling housing that can be detached from the pump unit also offers the advantage that it can be replaced independently, whether to replace a defective coupling or to adapt the coupling to a different type of motor unit. Due to the fluid-tight design of the pump unit relative to the coupling housing, no water leakage is possible during any of these procedures.

[0011] The risk of damage to the pump unit from lateral forces can be reduced by incorporating a bearing for the impeller shaft into the coupling housing. This allows the impeller shaft to be supported by the bearing in the coupling housing at a position spaced away from the impeller. Consequently, when lateral forces are applied, only a comparatively short lever arm and therefore only minimal leverage forces act on the impeller and its associated sealing bearing. The coupling housing can be designed without bearings on the drive side.

[0012] To facilitate regular impeller maintenance, it is proposed that the impeller housing include a housing cover that seals the pump unit against the coupling housing. This allows the impeller housing to be easily opened and closed for inspection, repair, or replacement of the impeller. The housing cover of the impeller housing preferably has a circumferential seal around its edge. With an impeller housing according to the invention, which is sealed by a housing cover, the coupling housing can be removed from the pump unit during maintenance without water leakage. According to the invention, the housing cover is a component that can be separated from the impeller housing and is located between the impeller housing and the coupling housing. This means that the housing cover is a component separate from both the impeller housing and the coupling housing.In a preferred embodiment, the housing cover projects from the impeller housing towards the coupling housing, forming a cavity for the impeller shaft. This design prevents damage to the detachable coupling and subsequent water ingress into the motor unit, even if water leaks through the housing cover, because the cavity formed by the housing cover is separated from the cavity formed by the coupling housing. Both cavities are separated by an intermediate wall of the coupling housing, which can be fluid-tightly penetrated by the impeller shaft. Preferably, the housing cover forms a section of the outer wall of the water pump, particularly a circumferential section. Impeller maintenance can be further simplified by incorporating a bearing for the impeller shaft into the housing cover.Consequently, the impeller can be guided through the bearing in the housing cover to the coupling housing via the impeller shaft. This allows the impeller to be completely removed from the pump unit by opening the housing cover, and subsequently inspected for damage or replaced. The bearing for the impeller shaft can preferably be a sealed bearing, ensuring that the impeller shaft exits the impeller housing in a fluid-tight manner.

[0013] To enable the use of a wide variety of motor units for the water pump and to reduce bearing wear, it is proposed that the detachable coupling be designed to compensate for axial misalignment. This allows for successful coupling within the coupling housing even with motor units of varying shaft lengths. Furthermore, it enables advantageous tolerance compensation with regard to the positioning of the motor unit. The detachable coupling could, for example, be a quick-release coupling to allow for particularly easy removal of the motor unit from the coupling housing.

[0014] To prevent unwanted reverse rotation of the impeller and the associated wear of the impeller blades, it is proposed that the motor shaft have a threaded output. This allows the output to be self-locking, unlike the keyed outputs commonly used in the prior art. Depending on the direction of rotation, either a left-hand or right-hand thread can be provided to create the self-locking effect.

[0015] To ensure a stable design, the detachable coupling can be a shaft coupling. A shaft coupling is defined as a mechanical component that is rotationally fixed to both the motor shaft and the impeller shaft. The shaft coupling preferably has a receptacle for each shaft, within which the inserted shaft can be clamped securely. Improved user-friendliness can be achieved if the detachable coupling can be disconnected without tools. This allows even private individuals to disconnect the pump unit from the motor unit for maintenance purposes without special tools. "Tool-free" in this context means that the detachable coupling can be disconnected using manually operated elements, such as clamps.

[0016] Brief description of the invention

[0017] The invention is illustrated in the drawing as an example. It shows

[0018] Fig. 1 a schematic side view of a water pump according to the invention. Fig. 2 a section along line 11-11 on a larger scale.

[0019] Ways to implement the invention

[0020] Figure 1 shows a water pump according to the invention for swimming pool filter systems, comprising a pump unit 1, which has an impeller housing 2, a coupling housing 3, and a motor unit 4. The coupling housing 3 is fluid-tight with respect to the pump unit 1, and the motor unit 4 is supported on the pump unit 1 via the coupling housing 3.

[0021] As can be seen in Fig. 2, an impeller 5 is arranged in the impeller housing 2, which is connected to the motor shaft 8 of the motor unit 4 via an impeller shaft 6 and a preferably axially offset-compensating detachable coupling 7. The detachable coupling 7 is arranged within the coupling housing 3 provided for this purpose, so that the impeller shaft 6 and the motor shaft 8 can be easily disconnected without opening the pump unit 1. The coupling housing 3 can be detachably connected to the pump unit 1, for example via a screw or plug connection. To provide improved stability against external forces, the coupling housing 3 can have a bearing 9 for the impeller shaft 6. As shown in Fig.As can be seen in Figure 2, this bearing 9 can be spaced axially from the impeller 5, so that when force is applied to the impeller shaft 6 in the radial direction, an advantageous support effect of the impeller shaft 6 is achieved by the bearing 9.

[0022] For simplified maintenance, a fluid-tight housing cover 10 can be provided between the impeller housing 2 and the coupling housing 3. This housing cover 10 can have at least one, preferably circumferential, seal 11 for sealing. Simplified design and maintenance conditions can be achieved by a housing cover 10 with an integrated bearing 12 for the impeller shaft.

[0023] The housing cover 10, together with the coupling housing 3, forms a cavity 13 that separates the coupling housing 3 from the impeller housing 1. The coupling housing 3, together with the motor unit 4, forms a coupling cavity 14 in which the coupling 7 is located. The coupling housing 3 can have a coupling partition 15 that separates the cavity 13 from the coupling cavity 14 and is penetrated by the impeller shaft 6. The water-carrying pump unit 1 can be sealed fluid-tight by a cover partition 16 formed by the housing cover 10. Parallel to the impeller shaft, the pump unit 1 is thus followed by the housing cover 10, the cavity 13 formed by it, the coupling housing 3, and the coupling cavity 14 formed by it.

Claims

Patent claims 1. Water pump for swimming pool filter systems comprising a pump unit (1) having an impeller housing (2) and an impeller shaft (6), wherein a coupling housing (3) having a detachable coupling (7) for the impeller shaft (6) is provided, which is attached to the pump unit (1) in a fluid-tight manner relative to the coupling housing (3), characterized in that the impeller housing (2) comprises a housing cover (10) sealing the pump unit (1) relative to the coupling housing (3).

2. Water pump according to claim 1, characterized in that a motor unit (4) is provided which is connected to the pump unit (1) for drive, the motor shaft (8) of which is detachably connected to the detachable coupling (7), wherein the motor unit (4) is supported on the pump unit (1) via the coupling housing (3).

3. Water pump according to claim 1 or 2, characterized in that the coupling housing (3) is detachably connected to the pump unit (1).

4. Water pump according to one of claims 1 to 3, characterized in that the coupling housing (3) has a bearing (9) for the impeller shaft (6).

5. Water pump according to claim 1, characterized in that the housing cover (10) has a bearing (9) for the impeller shaft (6).

6. Water pump according to one of claims 1 to 5, characterized in that the detachable coupling (7) is designed to compensate for axial misalignment.

7. Water pump according to one of claims 1 to 6, characterized in that the motor shaft (8) has a thread as an output.

8. Water pump according to one of claims 1 to 7, characterized in that the detachable coupling (7) is a shaft coupling.

9. Water pump according to one of claims 1 to 8, characterized in that the detachable coupling (7) can be detached without tools.

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