This application claims the benefit of and priority to U.S. Provisional Patent Application Serial No. 62/580,200, filed November 1, 2017, and having the same title as appears above, the entire contents of which application are hereby incorporated herein by this reference.

FIELD OF THE INVENTION

This invention relates to chlorination systems and more particularly, but not necessarily exclusively, to salt-water chlorinators having multiple, spaced gas traps, each with a corresponding water-flow sensor.

BACKGROUND OF THE INVENTION

U.S. Patent No. 8,920,615 to Davidson, et a!., whose entire contents are incorporated herein by this reference, describes one version of a salt-water chlorinator for swimming pools and spas. Recognized by the Davidson patent in connection with chlorinators“is that scale (principally calcium salts) deposits and builds up on die cathode” of an electrolysis ceil of the chlorinator,“thus reducing the efficiency of chlorine production by the cell.” See Davidson, col. 1, 11. 29-32. Accordingly, proposed in the Davidson patent are mechanical scrapers for removing scale from cathodes of the cells.

Also disclosed m the Davidson patent is use of a sensor within a housing of a chlorinator“to sense flow/no flow conditions in the electrolysis cell.” See id., col. 3, 11. 37-38. Although not addressed in the Davidson patent, well known in the pool and spa industry is that scale build-up may retain moisture. If scale deposits are present especially between a cathode and a flow sensor, their retained moisture may deceive the sensor into believing water is flowing through a cell when it, in fact, is not. Continuing to operate a chlormator without water flow through its electrolysis cell may prove to he a safety' hazard and thus is undesirable.

Some existing chlorinators utilize a“gas trap” m an effort to determine whether water is flowing through a cell. As electrolytic reactions occur within the cell, chloride ions are converted into chlorine gas (which di ssolves into water ultimately to form sodium hypochlorite), with hydrogen gas being liberated at the cathode of the cell. When not adequately removed from the cell by flowing water, these gasses accumulate and may be sensed, directly or indirectly, as indicating lack of water flow' through the cell.

Because sensing in these situations requires gas build-up within a cell, gas- trap sensors generally have slow response times. Moreover, they may be subject to false negative readings during periods of low-flow, as water may continue to flow yet at a velocity' inadequate to prevent gas accumulation. Formation of a gas trap within a cell also typically requires installation of a chlorinator in a particular orientation which might not permit it to be plumbed conveniently into a pool water-circulation system.

SUMMARY OF THE INVENTION

The present invention seeks to resolve some of the performance issues associated with existing salt-water chlorinators for swimming pools and spas. As one example, the invention may include utilizing two or more gas traps within a cell. The traps may be spaced so as to space the corresponding flow sensors. Further, if desired, logic may be employed requiring both (or all) sensors to sense the existence of water flow before providing electricity to the cell.

A mechanical barrier may inhibit any scale build up from approaching at least one flow sensor. Additionally, the chlorinator housing may be configured so as to route, or focus, gases toward a small-sized, high point thereof. As gas accumulates in the small area, it quickly displaces water so that the water line recedes below ^r a sensor. In this manner, rapid determination of a lack of water flow may be made by the associated sensor.

A geometric restriction, such as a ramp, may be utilized to increase water flow to one or more of the gas traps. The increased flow tends to displace the

accumulated gas more quickly, resulting in a cell design able to indicate occurrence of water flow even when the flow is low. Chlorinators of the present invention also may include a level indicator designed to alert an installer or user when a cell either is not level or is installed in an incorrect orientation. The innovative systems additionally may automatically limit chlorine output (below maximum) of the cells when water or air temperatures are low. Chlorine demand by a pool or spa typically is lower at low temperatures, and reducing output helps mitigate reduction m cell life otherwise risked through low-temperature operation.

It thus is an optional, non-exclusive object of the present invention to provide chlorinators utilizing more than one gas trap within their cells.

It is an additional optional, non-exclusive object of the present invention to provide chlorinators whose housings may be configured so as to route, or focus, gases toward a high point thereof. It is also an optional, non-exclusive object of the present invention to provide chlorinators having more than one water flow sensor, with the sensors being spaced within the cells.

it is another optional, non-exclusive object of the present invention to provide chlorinators configured to require sensing of water flow at more than one location within a cell in order to allow or continue electricity supply to or within the cell.

it is a further optional, non-exclusive object of the present invention to provide chlorinators including barriers designed to inhibit scale build up from

approaching at least some water flow sensors.

It is, moreover, an optional, non-exclusive object of the present invention to provide chlorinators comprising geometric restrictions increasing water flow to at least some gas traps.

It is yet another optional , non-exclusive object of the present invention to provide chlorinators including a level indicator.

Other objects, features, and advantages of the present invention will be apparent to those skilled in the relevant art with reference to the remaining text and the drawings of this application.

BRIEF DESCRIPTION OF THE DRAWINGS

FIGS. 1-3 are schematicized sectional views of a chlorinator consistent with the present invention.

FIG. 4 is a perspective view of the chlorinator of FIGS. 1-3 illustrating, among other things, a level or orientation indicator. DETAILED DESCRIPTION

FIGS. 1-4 illustrate various of these features of the invention. In a depicted embodiment of the invention, chlorinator 10 may include housing 14 and electrolysis cell 18. Housing 14 defines inlet 22 and outlet 26, through which circulating water of a swimming pool or spa may pass. The pressurized water hence flows through housing 14 in the direction of arrow A of FIG. 1.

Cell 18 may include an electrode assembly comprising at least anode plates 30 and a cathode. Also shown are two gas traps 1, 2 spaced within housing 14. Each trap 1, 2 may include a corresponding flow sensor, which therefore also will be spaced within the housing 14. Electronics of chlorinator 10 may process information provided by either or both of the flow sensors to assess water-flow conditions of cell 18. In some cases, for example, logic may be utilized requiring both sensors to sense the existence of water flow before electricity is provided to cell 18. The electronics may be present on a printed circuit board (PCB) similar to that of the Davidson patent and posi tioned within housing 14; alternatively, they may be positioned remotely and communicate (via wire or wirelessly) with the flow sensors of traps 1 , 2,

Additionally depicted in FIG. 1 is barrier 34 physically separating gas trap 1 from the electrode assembly. Barrier 34 may be any mechanical device suitable for inhibiting scale from approaching or contacting the flow sensor of gas trap 1. FIG. 3 illustrates that barrier 34 may, if desired, be positioned between inlet 22 and the electrode assembly and formed as a scoop configured also to channel pool water toward gas trap 1. By virtue of the existence and placement of barrier 34, gas trap 1 may be considered relatively“safe” from detrimental contact by scale. FIG. 2 illustrates a design of housing 14 causing gases to converge at or near the sensor (denoted“Gas Sensor 2”) associated with gas trap 2. In essence, gases may he routed, or focused, toward a small -sized, high point of housing 14 forming trap 2. Such routing is schematically illustrated by the arrows of FIG. 2. In this way, accumulating gas may quickly displace any water present so that the water line recedes below the sensor, allowing the sensor rapidly to determine a low (or lack of) flow condition within cell 14. Accordingly, gas trap 2 may be considered relatively“fast,” or “fast acting,” m use.

FIG. 3 depicts ramp 38 directing water flowing within housing 14 toward gas trap 2. Ramp 38 (or any other appropriate geometric restriction) hence may increase flow rate to the gas trap 2, removing gas having accumulated there as generated by the plates of the chlorinator 10. Such structure enhances the ability to detect occurrence of water flow even when the flow is low.

FIG. 4, finally, illustrates an exemplary level/orientation sensor or indicator 42 placed on an exterior surface 46 of housing 14 of chlorinator 10. Orientation indicator 42 may provide a visual (or other) indication of the level/orientation status of the housing 14 as, for example, by illuminating a light when housing 14 is oriented correctly. It thus may alert an installer or user when chlorinator 10 either is not level or is installed correctly. (As an example of improper installation orientation, if chlorinator 10 is installed so that gas traps I and 2 are not at or near the top of housing 14, gasses may not travel there.)

The foregoing is provided for purposes of illustrating, explaining, and describing embodiments of the present invention. Modifications and adaptations to these embodiments will be apparent to those skilled in the art and may be made without departing from the scope or spirit of the invention. Finally, references to“pools” and “swimming pools” herein may also refer to spas or other water containing vessels used for recreation or therapy and in connection with salt-water chlorinators are used.