Method for recirculating water and water recirculating device

Abstract

The invention relates to a method for recirculating water and a water recirculating device. The inventive concept relates to a method for recirculating water in a water recirculation device, the method comprising: receiving used water via a drain; determining a water quality measurement of the used water; supplying the used water to the valve means if the water quality measurement of the water is above the first quality threshold; in the valve device, water to be treated is formed by providing external water, used water, or a combination of external water and used water; producing treated water by treating the water to be treated using the water treatment device; and supplying the treated water to an outlet. The inventive concept also relates to a water recirculation device.

Description

[0001] This application is a divisional application of the application with the filing date of November 22, 2017, application number 201780072682.9, and invention title "Method and Water Recycling Device for Recycled Water". Technical Field

[0002] The devices, systems, and methods described herein generally relate to water recycling. More particularly, concepts for improving sanitary conditions in water recycling applications are presented. Background

[0003] In many parts of the world, clean water is becoming a scarce commodity. As a result, systems for water purification and recycling have been applied in many fields. Conventional water recycling devices can be effective, but are often costly and require frequent maintenance and significant retrofitting of existing pipelines.

[0004] An example of a water recycling device is known from, for example, SE469413. However, there is still a need for water recycling devices that are improved in terms of reliability of pollutant removal, cost, and ease of installation. Summary of the Invention

[0005] The object of the inventive concept is to alleviate, mitigate, or eliminate one or more of the above-identified deficiencies and drawbacks in the art, either individually or in combination.

[0006] According to a first aspect of the inventive concept, these and other objects are achieved, in whole or at least in part, by a method for recycling water in a water recycling device, the method comprising: receiving used water via a drain pipe; determining a water quality measurement of the used water; if the water quality measurement of the used water is higher than a first quality threshold, supplying the used water to a valve device; in the valve device, forming water to be treated by providing external water, the used water, or a combination of the external water and the used water; generating treated water by treating the water to be treated using a water treatment device; and supplying the treated water to an outlet.

[0007] The step of forming water to be treated by providing external water, the used water, or a combination of the external water and the used water may include the following sub-steps: if the water quality measurement is lower than the first quality threshold, providing only the external water to form the water to be treated, or if the water quality measurement is higher than the first quality threshold, providing only the used water to form the water to be treated.

[0008] The step of forming the water to be treated by providing external water, the used water, or a combination of the external water and the used water may include the following sub-steps: if the water quality measurement value is lower than the first quality threshold and the second quality threshold, only the external water is provided to form the water to be treated; if the water quality measurement value is higher than the first quality threshold but lower than the second quality threshold, the combination of the external water and the used water is provided to form the water to be treated; or if the water quality measurement value is higher than the first quality threshold and the second quality threshold, only the used water is provided to form the water to be treated.

[0009] The step of producing treated water by treating the water to be treated using a water treatment device may include the following sub-steps: filtering the water to be treated; and reducing the harmful effects of microorganisms in the water to be treated by using UV light.

[0010] According to a second aspect of the inventive concept, these and other objects are achieved in whole or at least in part by a water recirculation device including: an outlet configured to output treated water; a drain pipe for collecting the used water output from the outlet; a return path in liquid communication with the drain pipe; a treatment path in liquid communication with the return path and the outlet; an external water path in liquid communication with the treatment path, the external water path being connected to an external water outlet; a valve device configured to receive the used water from the return path and / or external water from the external water path as an input, the valve device being disposed between the return path and the treatment path, the valve device being configured to direct the input to the treatment path, the valve device being configured to mix the external water with the water from the return path; a circulation pump for providing flow in the water recirculation device; and a water treatment device disposed downstream of the valve device.

[0011] The water recirculation device may include a heating device disposed downstream of the water treatment device and / or combined with the water treatment device.

[0012] The heating device may be combined with the UV light treatment device into a single piece of equipment.

[0013] The water treatment device may include a filter device.

[0014] The water recirculation device may include a valve discard path configured to discharge water from the water recirculation device, and the valve device may also be configured to direct the water from the return path to the valve discard path.

[0015] The valve device may include at least a first valve device and a second valve device, and the first valve may be configured to receive the used water from the return path as an input, the first valve device may be configured to direct the used water from the return path to the treatment path, and the second valve device may receive the external water from the external water path as an input, and the second valve device may be configured to direct the external water to the treatment path.

[0016] The first valve device may be configured to direct the used water from the return path to the valve discard path.

[0017] The drain pipe may include a drain pipe discard path configured to discharge the used water from the water recycling device.

[0018] The water recycling device may include a sensor device configured to measure the water quality parameters of the water in the water recycling device.

[0019] The sensor device may include a conductivity sensor and a UV-sensor.

[0020] The UV sensor may be arranged in the heating device.

[0021] According to a third aspect of the inventive concept, these and other objects are all or at least partially achieved by a water recycling shower including a water recycling device according to the second aspect of the inventive concept.

[0022] Other objects, features and advantages of the inventive concept will be presented from the following detailed disclosure, from the appended claims and from the drawings.

[0023] Generally, all terms used in the claims will be interpreted according to their ordinary meaning in the technical field, unless otherwise clearly defined herein. All references to "a / an / the [element, device, component, mechanism, step, etc.]" shall be construed openly as referring to at least one instance of the element, device, component, mechanism, step, etc., unless otherwise clearly stated. The steps of any method disclosed herein need not be performed in the exact order disclosed, unless clearly stated. Brief Description of the Drawings

[0024] With reference to the drawings, the above and additional objects, features and advantages of the inventive concept will be better understood from the following illustrative and non-limiting detailed description of different embodiments of the inventive concept, in which: Figure 1 A conventional recirculation loop for recycling water in a shower is schematically shown; Figure 2 An example of a water recycling device is schematically shown; Figure 3 Schematically shows an example of a water recirculation device; Figures 4 - 6 Schematically shows the flow direction in the water recirculation device.

[0025] Figure 7 Is a flowchart of a method for recirculating water in a water recirculation device.

[0026] Figure 8 Schematically shows a conventional recirculation loop for recirculating water in a shower; Figure 9 Schematically shows an example of a water recirculation device; Figure 10 Schematically shows an example of a water recirculation device; Figures 11 - 13 Schematically shows the flow direction in the water recirculation device.

[0027] Figure 14 Is a flowchart of a method for emptying a water recirculation device. Detailed description

[0028] The present disclosure describes a water recirculation device and related methods. First, some terms can be defined to provide clarification for the following disclosure.

[0029] Generally, the inventors have recognized that the sanitary conditions in a water recirculation device can be improved by not allowing used water that is not suitable for recirculation to contaminate the external water in the water recirculation device. In addition, it has been recognized that the sanitary conditions in a water recirculation device can be improved by allowing water from an external water source to pass through a water treatment device.

[0030] Throughout the present disclosure, "external water" is mentioned. External water can be, for example, tap water or similar water. The term "external water" can be used herein for water that enters a water recirculation device from an external water source. The quality of the external water can vary depending on the application. In addition, the quality of the external water can vary from different countries.

[0031] Throughout the present disclosure, "treated water" and "used water" are mentioned. Treated water can be water that has passed through a water treatment device and / or a heating device. The treated water that exits the outlet of the water recirculation device can be referred to as used water.

[0032] Throughout the present disclosure, different paths are mentioned. These paths can be, for example, pipes for conveying water.

[0033] Throughout this disclosure, features that are arranged "downstream" and / or "upstream" of certain features are referred to. The flow direction referred to by the terms "downstream" and "upstream" should be understood as the flow direction from the drain pipe to the outlet. In other words, the "flow" referred to in the terms "downstream" and "upstream" is the flow from the drain pipe to the outlet.

[0034] Throughout this disclosure, the "cleaning" of the water recycling device is referred to. In this case, cleaning can refer to flushing the water recycling device, and / or flushing and cleaning the water recycling device using a cleaning agent.

[0035] It should be understood that a water recycling device can refer to a water recirculation device.

[0036] Reference Figure 1 , a conventional recirculation loop 100 for recycling water in a shower is shown. The recirculation loop 100 includes a drain pipe 104 for collecting the water discharged from the showerhead 102. The water collected through the drain pipe 104 is directed to a valve 106, which is configured to direct the water to a waste pipe 108 or the showerhead 102. A pump 110 provides the flow towards a valve 107, which receives the collected water and drinking water from a drinking water source 112 as inputs. The collected water can then be mixed with the drinking water and discharged through the showerhead 102. In some cases, the drinking water can be replaced by non-drinking water.

[0037] Reference Figure 2, shows a water recirculation device 200. The water recirculation device 200 includes an outlet 238 configured to output water. The outlet 238 can be a showerhead, a nozzle, or the like. The water recirculation device further includes a drain pipe 216 for collecting the water output by the outlet, and a return / drain path (R / E path) 220 in fluid communication with the drain pipe 216, wherein the R / E path 220 includes an inlet 218 for receiving the water collected by the drain pipe 216. The water collected by the drain pipe 216 can hereafter be referred to as used water. The R / E path is in fluid communication with a return path 222. The return path 222 is in fluid communication with a treatment path 230. The treatment path is in fluid communication with the outlet 238. External water can enter the water recirculation device via an external water path 224 in fluid communication with the treatment path 230, wherein the external water path 224 is connected to an external water source. The water in the treatment path 230 can hereafter be referred to as water to be treated. A valve device 226 can be disposed between the return path 222 and the treatment path 230. The valve device 226 can be configured to receive water from the return path, such as used water, and / or external water from the external water path as inputs. The valve device 226 can be configured to direct the inputs to the treatment path 230. The valve device 226 can be configured to mix the external water with the water from the return path, such as used water. The valve device can include a valve discard path 240. The valve discard path can be configured to discharge water from the water recirculation device 200. A circulation pump 228 can be disposed downstream of the valve device 226. The circulation pump 228 can provide at least a part of the flow of water in the water recirculation device 200. A water treatment device 232 can be disposed downstream of the valve device 226. The water treatment device 232 can include a filter device and / or a UV light treatment device. The water treatment device 232 can include at least one filter, such as a nanofilter, a microfilter, or a nanofilter and a microfilter. The water treatment device 232 can include at least one particle filter and at least one microbial filter. The water treatment device 232 can include at least one active substance for reducing the harmful effects of microorganisms in the water passing through the water treatment device 232. Such an active substance can be included, for example, in the filter medium of the filter, and / or released into the water inside the water treatment device 232. The water that has been treated by the water treatment device 232 can hereafter be referred to as treated water.

[0038] The heating device 236 can be placed downstream of the water treatment device 232. Compared with the case where water (such as a combination of used water and external water) is first heated and then treated, i.e., filtered and UV-light treated, by first reducing the harmful effects of microorganisms in the water in the water recirculation device 200 and then heating the water in the water recirculation device 200, the risk of microbial growth is reduced. The reason for this is that the heating device can, for example, heat the water to a temperature favorable for microbial growth. The heating device 236 can heat the water passing through the heating device 236. The heating device 236 can include a UV-light treatment device. The heating device 236 can be combined with the water treatment device 232. The heating device 236 can include a UV sensor configured to detect the UV light emitted from the UV-light treatment device after the UV light has passed through the water contained within the heating device 236. The heating device 236 can include a single piece of equipment for heating and UV-light treating water. The heating device 236 can provide treatment of the water. For example, the UV device can help reduce the harmful effects of microorganisms present in the water passing through the heating device 236. Therefore, the water that has passed through the heating device 236 can be referred to as treated water.

[0039] Still referring to Figure 2 , the water recirculation device 200 can include a drain path 234 that is in liquid communication with the treatment path 230. The inlet of the drain path 234 can be placed downstream of the circulation pump. The inlet of the drain path 234 can be placed upstream of the water treatment device 232. The drain path 234 can include a drain valve device configured to regulate the flow of water entering the drain path from the treatment path. The drain path 234 can be in liquid communication with the R / E path 220. The R / E path 220 can be configured to direct the water received from the drain path 234 to the drain pipe via the inlet of the R / E path 220.

[0040] The water recirculation device 200 can be configured to heat the water in the heating device 236 and then discharge the heated water to the R / E path 220 via the drain path.

[0041] The R / E path 220 can be configured to be in a first state, in which the water in the R / E path is allowed to flow in a direction away from the drain pipe 216. The first state of the R / E path 220 can be achieved by not allowing water to flow through the drain path 234.

[0042] The R / E path 220 can be configured to be in a second state, in which water in the R / E path is allowed to flow in the direction towards the drain pipe 216. The second state of the R / E path 220 can be achieved by setting the valve device 226 to receive only external water as input via the external water path 224, by operating the circulation pump 228, and by allowing water to flow through the drain path 234. Another instance of achieving the second state of the R / E path 220 is by stopping the circulation pump 228, not receiving external water as input via the external water path 224, and by allowing water to flow through the drain path 234.

[0043] Following are presented many advantages of the arrangement according to the present disclosure. Used water, external water, and treated water will be referred to. However, it should be understood that these types of water can be interchanged, and within the scope of the present disclosure, any combination of external water, used water, and treated water is possible.

[0044] An advantage of the arrangement according to the present disclosure is that the water quality measurement of the used water collected through the drain pipe 216 can be performed in the drain pipe 216. Thus, it can be decided whether to recycle the used water and thereby direct the water via the inlet 218 to the water treatment device 232, or whether the used water should be discarded via the drain pipe discard path 242. If the water is considered unsuitable for recycling, for example if the water quality measurement value of the used water is below a first quality threshold, the used water can be directed to the drain pipe discard path 242. Thus, the used water does not enter the return path 222 leading to the valve device 226, in which external water is input via the external water path 224. As a result, the risk of the used water with a water quality measurement value below the first quality threshold contaminating the external water is reduced.

[0045] Another advantage of the arrangement according to the present disclosure is that the external water input to the valve device 226 via the external water path 224 can be treated in the water treatment device 232 before being output through the outlet 238. Thus, the risk of allowing water containing contaminants to be output through the outlet 238 is reduced.

[0046] Yet another advantage of the arrangement according to the present disclosure is that water in at least a portion of the treatment path 230, such as water in the portion of the treatment path 230 upstream of the inlet of the drain path 234, and / or water in the water treatment device 232, and / or water in the heating device 236, can be discharged to the drain pipe 216 via the drain path 234, via the return path 222, and via the R / E path 220. By doing so, water can be prevented from remaining inside the water treatment device 232. In other words, the water recycling device 200 can be emptied. In one example, the water can be heated in the heating device 236 and then discharged to the drain pipe 216 through the water treatment device 232, via the drain path 234 and the R / E path 220. This process can be repeated many times until a desired effect is achieved. Such a desired effect can be, for example, a reduction in pollutants in the water treatment device 232. In this case, pollutants should be given a broad interpretation, meaning any kind of substance that is harmful to humans or to the function of the water recycling device. The process of discharging water from the water recycling device can be automatic and / or carried out at specific intervals as planned. Thereby, the water treatment device 232, the drain path 234, the R / E path 220, and the drain pipe 216 can be flushed with heated water. Heated water can provide a more effective flushing and / or cleaning in some cases compared to unheated water. The water recycling device 200 can be arranged such that the emptying of the water recycling device 200 can be carried out using gravity. For example, the water recycling device 200 can be arranged such that no water traps are formed in different paths of the water recycling device 200. In addition, the water recycling device 200 can be configured to be installed such that the heating device 236 is arranged above the water treatment device 232 with respect to gravity. Similarly, the drain path 234 can be arranged above the R / E path 220 with respect to gravity. In one example, the circulation pump 228 and / or another pump arranged in the water recycling device 200 can provide the flow of water such that the water recycling device 200 can be emptied.

[0047] Yet another advantage of the arrangement according to the present disclosure is that external water can enter the valve device 226, flow through the treatment path 230 to the inlet of the drain path 234, and be guided to the drain pipe 216 via the return path 222 and the R / E path 220. Thus, the water recycling device 200 can be flushed with external water. For example, the drain pipe 216 can be flushed with external water. The drain pipe 216 can include, for example, a pre-filter for filtering the water collected from the outlet 238, such as used water. The pre-filter can be a screen filter. In this case, yet another advantage is that the pre-filter can be flushed with external water. The water recycling device 200 can include a sensor device. The sensor device can be arranged in the drain pipe 216. The sensor device can be configured to measure a number of water quality parameters in the water in the water recycling device and / or in the water collected through the drain pipe 216. The sensor device can be configured to determine the water quality measurement value of the water in the water recycling device. The sensor device can include a conductivity sensor and a UV-sensor. The conductivity sensor can be arranged in the drain pipe 216. The UV-sensor can be arranged in the heating device 236. In this case, yet another advantage is that when the water recycling device is emptied, external water can pass through the sensor device, and thereby the external water can be measured by the sensor device to set a reference value for the water quality parameter value.

[0048] Yet another advantage of the arrangement according to the present disclosure is that the water in at least a part of the treatment path 230, the drain path 234, and the return path 222 can circulate in the treatment path 230, the drain path 234, and the return path 222. In other words, at least a part of the treatment path 230, the drain path 234, and the return path 222 can form a loop. The water can be, for example, used water, external water, treated water, or any combination of used water, external water, and treated water. Thus, the circulation pump 228 can be flushed.

[0049] Yet another advantage of the arrangement according to the present disclosure is that internal cleaning and disinfection can be achieved by adding chemicals to the drain pipe 216, and then a disinfection cycle can be triggered. The disinfection cycle can pump the water containing the chemicals into any one of the water treatment device 232, the circulation pump 228, the valve device 226, and the heating device 236, or into any one of the R / E path 220, the return path 222, the drain path 234, and the treatment path 230. The disinfection cycle can be triggered from an application on a smart device such as a smart phone.

[0050] The drain pipe 216 may include a drain pipe discard path 242. The drain pipe discard path 242 may be separated from the inlet of the R / E path 220 such that used water that is not intended to be processed by the water treatment device 232 and is thus not intended to be recycled does not have to enter the inlet of the R / E path 220 in order to reach the drain pipe discard path 242. Thereby, contaminated water can be prevented from contaminating any components arranged downstream of the inlet of the R / E path 220.

[0051] Now referring to Figure 3 , a water recycling device 300 similar to the water recycling device 200 described in connection with Figure 2 is shown. It should be understood that the water recycling device 300 may include any of the features described above in connection with Figure 2 . The water recycling device 300 may include a first valve device 326 and a second valve device 327. The first valve device 326 may be configured to receive used water from the return path 322 as an input. The first valve device may be configured to direct the used water from the return path 322 to the treatment path 330. The second valve device 327 may receive external water from the external water path 324 as an input. The second valve device 327 may be configured to direct the external water to the treatment path 330. The second valve device 327 may be configured to direct the used water received from the first valve device 326 to the treatment path 330. The first valve device 326 may be configured to direct the used water from the return path 322 to the valve discard path 340.

[0052] Now referring to Figures 4 - 6 , the flow directions in the water recycling device are shown. First referring to Figure 4 , when water is output from the water recycling device, the used water may be collected by the drain pipe and enter the R / E path via the inlet of the R / E path. The used water may then be directed to the return path and the valve device. Thus, the used water, and only the used water, may be directed to the water treatment device and output through the outlet of the water recycling device. For example, this may be the case if the measured water quality value of the used water is higher than the first quality threshold and the second quality threshold. At the valve device, external water may enter the water recycling device. For example, this may be the case if the measured water quality value of the used water is higher than the first quality threshold but lower than the second quality threshold. In other words, a combination of used water and external water is used. It should be understood that only used water, only external water, or a combination of both may be used. For example, if the measured water quality value of the used water is lower than the first quality threshold, external water may be used, and only external water. The water to be treated may then enter the treatment path via the circulation pump and be directed to the water treatment device. The treated water may then enter the heating device and subsequently be output from the outlet.

[0053] The used water can also be directed to a drain path (not shown). In this case, the used water in the treatment path is first allowed to leave the treatment path via the drain path, the R / E path, and the drain pipe, and optionally via the outlet if any used water has passed the inlet of the drain path. External water can then enter the valve device, and subsequently enter the treatment path, and be output from the outlet via the water treatment device. Thereby, the used water that is considered unsuitable for recycling for any reason can be discharged, for example if the water quality measurement of the used water is below a first quality threshold.

[0054] Another possibility is that the used water enters the drain pipe and subsequently enters the drain discard pipe. This can be the case, for example, if the used water is considered unsuitable for recycling for any reason, such as if the water quality measurement of the used water is below a first quality threshold and a second quality threshold. In this case, the used water does not enter the inlet of the R / E path. Instead, external water can enter the valve device, and subsequently enter the treatment path, and be output from the outlet via the water treatment device.

[0055] Yet another possibility is to fill the water recycling device with water. For example, external water can be introduced into the water recycling device. This can be achieved by setting the valve device to receive external water as an input, setting the drain valve device to prevent water from flowing into the drain path, and providing a water flow in the water recycling device by a circulation pump. The external water can be allowed to fill the water recycling device to a certain level such that the external water is introduced into the heating device.

[0056] Now referring to Figure 5 , the drain valve device can be set to allow water to flow into the drain path such that the water recycling device can be emptied. In this case, the circulation pump can be turned off. Thus, water can be discharged from the treatment path via the heating device, the water treatment device, the drain path, and the R / E path to the drain pipe, and subsequently to the drain discard pipe. When emptying the water recycling device, air can be drawn in through the outlet in order to balance the pressure inside the water recycling device. The air drawn in through the outlet can help keep the water treatment device dry, thereby reducing the likelihood of microbial growth in the water treatment device.

[0057] Now referring to Figure 6 , the used water and / or external water can be circulated through the treatment path, the drain path, and the return path. This can be achieved by first providing the used water and / or external water to the water recycling device. Subsequently, the valve device can be set to receive only the water received from the return path. The drain valve device can be set to allow water to flow into the drain path. The circulation pump can provide the flow for circulating the water through the treatment path, the drain path, and the return path.

[0058] Now refer to Figure 7 , a method for recycling water in a water recycling device is shown in the flowchart. The method includes step 742 of receiving used water via a drain pipe; step 744 of determining a water quality measurement of the used water; step 746 of supplying the used water to a valve device if the water quality measurement of the used water is higher than a first quality threshold; step 748 of forming water to be treated in the valve device by providing external water, used water, or a combination of external water and used water; step 750 of generating treated water by treating the water to be treated using a water treatment device; and step 752 of supplying the treated water to an outlet.

[0059] A method for recycling water in a water recycling device is described below. The water recycling device may include: an outlet configured to output treated water; a drain pipe for collecting used water output from the outlet; a return path in liquid communication with the drain pipe; a treatment path in liquid communication with the return path and the outlet; an external water path in liquid communication with the treatment path, the external water path being connected to an external water outlet; a valve device configured to receive the used water from the return path and / or external water from the external water path as inputs, the valve device being disposed between the return path and the treatment path, the valve device being configured to direct the inputs to the treatment path, the valve device being configured to mix the external water with the water from the return path; a circulation pump for providing flow in the water recycling device; and a water treatment device disposed downstream of the valve device. The method may include: receiving used water via a drain pipe; determining a water quality measurement of the used water; supplying the used water to a valve device if the water quality measurement of the used water is higher than a first quality threshold; forming water to be treated in the valve device by providing external water, used water, or a combination of external water and used water; generating treated water by treating the water to be treated using a water treatment device; and supplying the treated water to an outlet.

[0060] The step of forming water to be treated by providing external water, used water, or a combination of external water and used water may further include the following sub-steps: if the water quality measurement is lower than the first quality threshold and the second quality threshold; then only provide external water to form water to be treated; if the water quality measurement is higher than the first quality threshold but lower than the second quality threshold, then provide a combination of external water and used water to form water to be treated; or if the water quality measurement is higher than the first quality threshold and the second quality threshold, then only provide used water to form water to be treated.

[0061] The step of producing treated water by treating water to be treated using a water treatment device may further include the following sub-steps: filtering the water to be treated; and reducing the harmful effects of microorganisms in the water to be treated by using UV light.

[0062] The water quality measurement value may be, for example, a measurement value of the conductivity in the used water. The water quality measurement value may be detected in the used water in the drain pipe of the water recycling device.

[0063] The inventive concept has been mainly described above with reference to some embodiments. However, as will be readily understood by those skilled in the art, other embodiments different from the embodiments disclosed above are equally possible within the scope of the inventive concept defined by the appended claims. List of reference signs

[0064] 100 Recirculation loop 102 Sprinkler 104 Drain pipe 106 Valve 107 Valve 108 Waste pipe 110 Pump 112 Drinking water source 200 Water recycling device 216 Drain pipe 218 Inlet 220 Return / drain path 222 Return path 224 External water path 226 Valve device 228 Circulation pump 230 Treatment path 232 Water treatment device 234 Drain path 236 Heating device 238 Outlet 240 Valve discard path 242 Drain pipe discard path 300 Water recycling device 322 Return path 324 External water path 326 First valve device 327 Second valve device 330 Treatment path 340 Valve discard path 742 Step of receiving used water 744 Step of determining a water quality measurement value Step of supplying used water to a valve device Step of forming water to be treated Step of generating treated water Step of supplying treated water to an outlet The disclosure in the following paragraphs relates to aspects relevant to the inventive concept presented above. The devices, systems, and methods described below generally relate to water recycling. More particularly, a concept of improved hygiene conditions in water recycling applications is proposed.

[0065] In many parts of the world, clean water is becoming a scarce commodity. As a result, systems for water purification and recycling have been applied in many fields. Conventional water recycling devices can be effective, but are usually costly and require frequent maintenance and major modifications to existing pipelines.

[0066] An example of a water recycling device is known from, for example, SE469413. However, there is still a need for a water recycling device that is improved in terms of reliability of pollutant removal, cost, and ease of installation.

[0067] The object of the inventive concept is to alleviate, mitigate, or eliminate one or more of the above-identified deficiencies and drawbacks in the art, either individually or in combination.

[0068] According to a fourth aspect of the inventive concept, these and other objects are achieved, in whole or at least in part, by a water recycling device comprising: an outlet configured to output treated water; a drain pipe for collecting used water output from the outlet; a return / drain path in liquid communication with the drain pipe, wherein the return / drain path includes an inlet for receiving water collected through the drain pipe; a return path in liquid communication with the return / drain path; a treatment path in liquid communication with the return path and the outlet; an external water path in liquid communication with the treatment path, the external water path being connected to an external water outlet; a valve device configured to receive used water from the return path and / or external water from the external water path as inputs, the valve device being disposed between the return path and the treatment path, the valve device being configured to direct the inputs to the treatment path, the valve device being configured to mix the external water with the used water from the return path; a circulation pump for providing flow in the water recycling device; and a water treatment device disposed downstream of the valve device.

[0069] The water recycling device may include a heating device disposed downstream of the water treatment device.

[0070] The water recycling device may include a drain path in liquid communication with the treatment path, wherein the drain path is disposed downstream of the valve device and upstream of the water treatment device.

[0071] The drain path may include a drain valve device configured to regulate the flow of water entering the drain path from the treatment path.

[0072] The drain path may be in liquid communication with a return / drain path.

[0073] The water recirculation device may be configured to heat the water in the heating device and then discharge the heated water to the return / drain path via the drain path.

[0074] The water recirculation device may be configured to circulate water in at least a portion of the treatment path, the drain path, and the return path.

[0075] The return / drain path may be configured to direct the water received from the drain path to a drain pipe via an inlet of the return / drain path.

[0076] The drain pipe may include a drain pipe discard path configured to discharge water from the water recirculation device.

[0077] The return / drain path may be configured to be in a first state in which the water in the return / drain path is allowed to flow in a direction away from the drain pipe, and the return / drain path may be configured to be in a second state in which the water in the return / drain path is allowed to flow in a direction towards the drain pipe.

[0078] The water recirculation device may include a sensor device configured to measure a water quality parameter of the water in the water recirculation device.

[0079] The sensor device may include a conductivity sensor and a UV-sensor.

[0080] According to a fifth aspect of the inventive concept, all or at least some of these and other objects are achieved by a water recirculation shower including a water recirculation device according to the first aspect of the inventive concept.

[0081] According to a sixth aspect of the inventive concept, these and other objects are achieved in whole or at least in part by a method for emptying a water recycling device, the water recycling device comprising: an outlet configured to output treated water; a drain pipe for collecting used water output from the outlet; a return / empty path in fluid communication with the drain pipe, wherein the return / empty path includes an inlet for receiving water collected by the drain pipe; a return path in fluid communication with the return / empty path; a treatment path in fluid communication with the return path and the outlet; an external water path in fluid communication with the treatment path, the external water path being connected to an external water outlet; a valve device, wherein the valve device is configured to receive used water from the return path and / or external water from the external water path as inputs, the valve device being disposed between the return path and the treatment path, the valve device being configured to direct the inputs to the treatment path, the valve device being configured to mix the external water with the used water from the return path; a circulation pump for providing flow in the water recycling device; a water treatment device disposed downstream of the valve device; and an emptying path in fluid communication with the treatment path, wherein the emptying path is disposed downstream of the circulation pump and upstream of the water treatment device; wherein the method comprises the step of supplying water in the water recycling device to the drain pipe via the emptying path and / or the return / empty path.

[0082] The step of supplying water in the water recycling device to the drain pipe via the emptying path and / or the return / empty path may be accomplished by gravity.

[0083] According to a seventh aspect of the inventive concept, these and other objects are achieved in whole or at least in part by a method for cleaning a water recycling device, the water recycling device comprising: an outlet configured to output treated water; a drain pipe for collecting used water output from the outlet; a return / empty path in fluid communication with the drain pipe, wherein the return / empty path includes an inlet for receiving water collected by the drain pipe; a return path in fluid communication with the return / empty path; a treatment path in fluid communication with the return path and the outlet; an external water path in fluid communication with the treatment path, the external water path being connected to an external water outlet; a valve device, wherein the valve device is configured to receive used water from the return path and / or external water from the external water path as inputs, the valve device being disposed between the return path and the treatment path, the valve device being configured to direct the inputs to the treatment path, the valve device being configured to mix the external water with the used water from the return path; a circulation pump for providing flow in the water recycling device; a water treatment device disposed downstream of the valve device; and an emptying path in fluid communication with the treatment path, wherein the emptying path is disposed downstream of the circulation pump and upstream of the water treatment device; the method comprising the steps of: supplying used water, external water, or a combination of used water and external water to the water recycling device; and emptying the water recycling device according to a second aspect of the inventive concept.

[0084] The step of providing used water, external water, or a combination of used water and external water to the water recycling device may include the sub-step of at least partially filling the water treatment device with used water, external water, or a combination of used water and external water.

[0085] The step of providing used water, external water, or a combination of used water and external water to the water recycling device may include the sub-step of circulating used water, external water, or a combination of used water and external water in at least a part of the drain path, the return path, and the treatment path.

[0086] The water recycling device may include a heater device disposed downstream of and / or combined with the water treatment device, and the step of providing used water, external water, or a combination of used water and external water to the water recycling device may include the sub-step of heating used water, external water, or a combination of used water and external water in the heating device.

[0087] Other objects, features, and advantages of the inventive concept will be presented from the following detailed disclosure, from the appended claims, and from the drawings.

[0088] Generally, all terms used in the claims will be interpreted according to their ordinary meaning in the technical field, unless otherwise clearly defined herein. All references to "a / one / the [element, device, component, mechanism, step, etc.]" shall be construed openly as referring to at least one instance of the said element, device, component, mechanism, step, etc., unless otherwise clearly stated. The steps of any method disclosed herein need not be performed in the exact order disclosed, unless clearly stated.

[0089] Referring to the drawings, the above and additional objects, features, and advantages of the inventive concept will be better understood through the following illustrative and non-limiting detailed description of different embodiments of the inventive concept.

[0090] This disclosure describes a water recycling device and related methods. First, some terms may be defined to provide clarification for the following disclosure.

[0091] Generally, the inventors have recognized that when the water recycling device is not used for recycling water, such as between uses, or between certain time intervals, the sanitary conditions in the water recycling device can be improved by discharging water from the water recycling device. By doing so, water stagnation can be prevented. It has also been recognized that external water and / or water collected in the drain pipe of the water recycling device can be used to flush the water recycling device.

[0092] Throughout this disclosure, "external water" is mentioned. External water can be, for example, tap water or similar water. The term "external water" can be used herein to refer to water that enters a water recycling device from an external water source. The quality of external water can vary depending on the application. Additionally, the quality of external water can vary from country to country.

[0093] Throughout this disclosure, "treated water" and "used water" are mentioned. Treated water can be water that has passed through a water treatment device and / or a heating device. Treated water that exits the outlet of the water recycling device can be referred to as used water.

[0094] Throughout this disclosure, different paths are mentioned. These paths can be, for example, pipes for conveying water.

[0095] Throughout this disclosure, features that are "downstream" and / or "upstream" of certain features are mentioned. The flow directions referred to by the terms "downstream" and "upstream" should be understood as the flow direction from the drain pipe to the outlet. In other words, the "flow" referred to in the terms "downstream" and "upstream" is the flow from the drain pipe to the outlet.

[0096] Throughout this disclosure, "cleaning" of the water recycling device is mentioned. In this case, cleaning can refer to flushing of the water recycling device, and / or flushing and cleaning of the water recycling device using a cleaning agent.

[0097] Throughout this disclosure, "water quality parameter" can be used interchangeably with "water quality measurement".

[0098] It should be understood that a water recycling device can refer to a water recirculation device.

[0099] Reference Figure 8 , a conventional recirculation loop 1100 for recycling water in a shower is shown. The recirculation loop 1100 includes a drain pipe 1104 for collecting water discharged from a shower head 1102. The water collected through the drain pipe 1104 is directed to a valve 1106, which is configured to direct the water to a waste pipe 1108 or the shower head 1102. A pump 1110 provides flow towards a valve 1107, which receives the collected water and drinking water from a drinking water source 1112 as inputs. The collected water can then be mixed with the drinking water and discharged through the shower head 1102. In some cases, the drinking water can be replaced with non-drinking water.

[0100] Reference Figure 9, showing a water recirculation device 1200. The water recirculation device 1200 includes an outlet 1238 configured to output water. The outlet 1238 can be a showerhead, a sprinkler, or the like. The water recirculation device further includes a drain pipe 1216 for collecting the water output through the outlet, and a return / emptying path (R / E path) 1220 in fluid communication with the drain pipe 1216, wherein the R / E path 1220 includes an inlet 1218 for receiving the water collected through the drain pipe 1216. The water collected through the drain pipe 1216 can hereinafter be referred to as used water. The R / E path is in fluid communication with a return path 1222. The return path 1222 is in fluid communication with a treatment path 1230. The treatment path is in fluid communication with the outlet 1238. External water can enter the water recirculation device via an external water path 1224 in fluid communication with the treatment path 1230, wherein the external water path 1224 is connected to an external water source. The water in the treatment path 1230 can hereinafter be referred to as water to be treated. A valve device 1226 can be disposed between the return path 1222 and the treatment path 1230. The valve device 1226 can be configured to receive water from the return path, such as used water, and / or external water from the external water path as inputs. The valve device 1226 can be configured to direct the inputs to the treatment path 1230. The valve device 1226 can be configured to mix the external water with the water from the return path, such as used water. The valve device can include a valve discard path 1240. The valve discard path can be configured to discharge water from the water recirculation device 1200. A circulation pump 1228 can be disposed downstream of the valve device 1226. The circulation pump 1228 can provide at least a part of the flow of water in the water recirculation device 1200. A water treatment device 1232 can be disposed downstream of the valve device 1226. The water treatment device 1232 can include a filter device and / or a UV light treatment device. The water treatment device 1232 can include at least one filter, such as a nanofilter, a microfilter, or a nanofilter and a microfilter. The water treatment device 1232 can include at least one particle filter and at least one microbial filter. The water treatment device 1232 can include at least one active substance for reducing the harmful effects of microorganisms in the water passing through the water treatment device 1232. Such an active substance can be contained, for example, in the filter medium of the filter, and / or released into the water inside the water treatment device 1232. The water that has been treated by the water treatment device 1232 can hereinafter be referred to as treated water.

[0101] The heating device 1236 can be placed downstream of the water treatment device 1232. By first reducing the harmful effects of microorganisms in the water in the water recirculation device 1200 and then heating the water in the water recirculation device 1200, the risk of microbial growth is reduced compared to water (such as a combination of used water and external water) being first heated and then treated, i.e., filtered and UV light treated. This occurs because the heating device can, for example, heat the water to a temperature favorable for microbial growth. The heating device 1236 can heat the water passing through the heating device 1236. The heating device 1236 can include a UV light treatment device. The heating device 1236 can be combined with the water treatment device 1232. The heating device 1236 can include a UV sensor configured to detect the UV light emitted from the UV light treatment device after the UV light has passed through the water contained within the heating device 1236. The heating device 1236 can include a single piece of equipment for heating and UV light treating water. The heating device 1236 can provide treatment of the water. For example, the UV device can help reduce the harmful effects of microorganisms present in the water passing through the heating device 1236. Thus, the water that has passed through the heating device 1236 can be referred to as treated water.

[0102] Still referring to Figure 9 , the water recirculation device 1200 can include a drain path 1234 in liquid communication with the treatment path 1230. The inlet of the drain path 1234 can be placed downstream of the circulation pump. The inlet of the drain path 1234 can be placed upstream of the water treatment device 1232. The drain path 1234 can include a drain valve device configured to regulate the flow of water entering the drain path from the treatment path. The drain path 1234 can be in liquid communication with the R / E path 1220. The R / E path 1220 can be configured to direct the water received from the drain path 1234 to the drain pipe via the inlet of the R / E path 1220.

[0103] The water recirculation device 1200 can be configured to heat the water in the heating device 1236 and then discharge the heated water to the R / E path 1220 via the drain path.

[0104] The R / E path 1220 can be configured to be in a first state, in which the water in the R / E path is allowed to flow in a direction away from the drain pipe 1216. The first state of the R / E path 1220 can be achieved by not allowing water to flow through the drain path 1234.

[0105] The R / E path 1220 can be configured to be in a second state, in which the water in the R / E path is allowed to flow in a direction towards the drain pipe 1216. The second state of the R / E path 1220 can be achieved by setting the valve device 1226 to receive only external water as input via the external water path 1224, by operating the circulation pump 1228, and by allowing water to flow through the drain path 1234. Another instance of achieving the second state of the R / E path 1220 is by stopping the circulation pump 1228, not receiving external water as input via the external water path 1224, and by allowing water to flow through the drain path 1234.

[0106] Following are presented many advantages of the arrangement according to the present disclosure. Used water, external water, and treated water will be referred to. However, it should be understood that these types of water can be interchanged, and within the scope of the present disclosure, any combination of external water, used water, and treated water is possible.

[0107] An advantage of the arrangement according to the present disclosure is that a water quality measurement of the used water collected through the drain pipe 1216 can be performed in the drain pipe 1216. Thus, it can be decided whether to recycle the used water and thereby direct the water via the inlet 1218 to the water treatment device 1232, or whether the used water should be discarded via the drain discard path 1242. If the water is considered unsuitable for recycling, for example if the water quality measurement value of the used water is below a first quality threshold, the used water can be directed to the drain discard path 1242. Thus, the used water does not enter the return path 1222 leading to the valve device 1226, in which external water is input via the external water path 1224. As a result, the risk of the used water with a water quality measurement value below the first quality threshold contaminating the external water is reduced. The water quality measurement value can be, for example, a measurement of the conductivity in the used water. The water quality measurement value can be detected in the used water in the drain pipe of the water recycling device.

[0108] Another advantage of the arrangement according to the present disclosure is that the external water input to the valve device 1226 via the external water path 1224 can be treated in the water treatment device 1232 before being output through the outlet 1238. Thus, the risk of allowing water containing contaminants to be output through the outlet 1238 is reduced.

[0109] Another advantage of the arrangement according to the present disclosure is that water in at least a portion of the treatment path 1230 (such as water in the portion of the treatment path 1230 upstream of the inlet of the drain path 1234) and / or water in the water treatment device 1232 and / or water in the heating device 1236 can be discharged to the drain pipe 1216 via the drain path 1234, via the return path 1222, and via the R / E path 1220. By doing so, water can be prevented from remaining inside the water treatment device 1232. In other words, the water recycling device 1200 can be emptied. In one example, the water can be heated in the heating device 1236 and then discharged to the drain pipe 1216 through the water treatment device 1232, via the drain path 1234 and the R / E path 1220. This process can be repeated many times until the desired effect is achieved. Such a desired effect can be, for example, a reduction in contaminants in the water treatment device 1232. In this case, contaminants should be given a broad interpretation, meaning any kind of substance that is harmful to humans or the function of the water recycling device. The process of discharging water from the water recycling device can be automatic and / or carried out at specific intervals as planned. Thus, the water treatment device 1232, the drain path 1234, the R / E path 1220, and the drain pipe 1216 can be flushed with heated water. Heated water can provide a more effective flushing and / or cleaning in some cases compared to unheated water. The water recycling device 1200 can be arranged such that the emptying of the water recycling device 1200 can be carried out using gravity. For example, the water recycling device 1200 can be arranged such that no water traps are formed in different paths of the water recycling device 1200. In addition, the water recycling device 1200 can be configured to be installed such that the heating device 1236 is arranged above the water treatment device 1232 with respect to gravity. Similarly, the drain path 1234 can be arranged above the R / E path 1220 with respect to gravity. In one example, the circulation pump 1228 and / or another pump arranged in the water recycling device 1200 can provide the flow of water such that the water recycling device 1200 can be emptied.

[0110] Yet another advantage of the arrangement according to the present disclosure is that external water can enter the valve device 1226, flow through the treatment path 1230 to the inlet of the drain path 1234, and be guided to the drain pipe 1216 via the return path 1222 and the R / E path 1220. Thus, the water recycling device 1200 can be flushed with external water. For example, the drain pipe 1216 can be flushed with external water. The drain pipe 1216 can include, for example, a pre-filter for filtering the water collected from the outlet 1238, such as used water. The pre-filter can be a screen filter. In this case, yet another advantage is that the pre-filter can be flushed with external water. The water recycling device 1200 can include a sensor device. The sensor device can be arranged in the drain pipe 1216. The sensor device can be configured to measure a number of water quality parameters in the water in the water recycling device and / or in the water collected through the drain pipe 1216. The sensor device can be configured to determine the water quality measurement value of the water in the water recycling device. The sensor device can include a conductivity sensor and a UV-sensor. The conductivity sensor can be arranged in the drain pipe 1216. The UV-sensor can be arranged in the heating device 1236. In this case, yet another advantage is that when the water recycling device is emptied, external water can pass through the sensor device, and by this external water can be measured by the sensor device to set a reference value for the water quality parameter value.

[0111] Yet another advantage of the arrangement according to the present disclosure is that the water in at least a part of the treatment path 1230, the drain path 1234, and the return path 1222 can circulate in the treatment path 1230, the drain path 1234, and the return path 1222. In other words, at least a part of the treatment path 1230, the drain path 1234, and the return path 1222 can form a loop. The water can be, for example, used water, external water, treated water, or any combination of used water, external water, and treated water. Thus, the circulation pump 1228 can be flushed.

[0112] Yet another advantage of the arrangement according to the present disclosure is that internal cleaning and disinfection can be achieved by adding chemicals to the drain pipe 1216, and then a disinfection cycle can be triggered. The disinfection cycle can pump the water containing the chemicals from the drain pipe 1216 into any one of the water treatment device 1232, the circulation pump 1228, the valve device 1226, and the heating device 1236, or into any one of the R / E path 1220, the return path 1222, the drain path 1234, and the treatment path 1230. The disinfection cycle can be triggered from an application on a smart device such as a smart phone.

[0113] The drain pipe 1216 may include a drain pipe discard path 1242. The drain pipe discard path 1242 may be separated from the inlet of the R / E path 1220 such that used water that is not intended to be processed by the water treatment device 1232 and thus not intended to be recycled does not have to enter the inlet of the R / E path 1220 in order to reach the drain pipe discard path 1242. Thereby, it is possible to prevent contaminated water from contaminating any components arranged downstream of the inlet of the R / E path 1220.

[0114] Now referring to Figure 10 , a water recycling device 1300 is shown that is similar to the water recycling device 1200 described in connection with Figure 9 . It should be understood that the water recycling device 1300 may include any of the features described above in connection with Figure 9 . The water recycling device 1300 may include a first valve device 1326 and a second valve device 1327. The first valve device 1326 may be configured to receive used water from the return path 1322 as an input. The first valve device may be configured to direct the used water from the return path 1322 to the treatment path 1330. The second valve device 1327 may receive external water from the external water path 1324 as an input. The second valve device 1327 may be configured to direct the external water to the treatment path 1330. The second valve device 1327 may be configured to direct the used water received from the first valve device 1326 to the treatment path 1330. The first valve device 1326 may be configured to direct the used water from the return path 1322 to the valve discard path 1340.

[0115] Now referring to Figures 11 - 13 , the flow direction in the water recycling device is shown. First referring to Figure 11, when water is output from the water recycling device, the used water can be collected through the drain pipe and enter the R / E path through the inlet of the R / E path. The used water can then be directed to the return path and the valve device. Thus, the used water, and only the used water, can be directed to the water treatment device and output through the outlet of the water recycling device. For example, this can be the case if the measured water quality value of the used water is higher than the first quality threshold and the second quality threshold. At the valve device, external water can enter the water recycling device. For example, this can be the case if the measured water quality value of the used water is higher than the first quality threshold but lower than the second quality threshold. In other words, a combination of used water and external water is used. It should be understood that only used water, only external water, or a combination of both can be used. For example, if the measured water quality value of the used water is lower than the first quality threshold, external water can be used, and only external water. The water to be treated can then enter the treatment path via the circulation pump and be directed to the water treatment device. The treated water can then enter the heating device and subsequently be output from the outlet.

[0116] The used water can also be directed to a drain path (not shown). In this case, the used water in the treatment path is first allowed to leave the treatment path via the drain path, the R / E path, and the drain pipe, and optionally via the outlet if any used water has passed through the inlet of the drain path. External water can then enter the valve device and subsequently enter the treatment path and be output from the outlet via the water treatment device. Thus, the used water that is considered unsuitable for recycling for any reason, such as if the measured water quality value of the used water is lower than the first quality threshold, can be discharged.

[0117] Another possibility is that the used water enters the drain pipe and subsequently enters the drain disposal pipe. For example, this can be the case if the used water is considered unsuitable for recycling for any reason, such as if the measured water quality value of the used water is lower than the first quality threshold and the second quality threshold. In this case, the used water does not enter the inlet of the R / E path. Instead, external water can enter the valve device and subsequently enter the treatment path and be output from the outlet via the water treatment device.

[0118] Another possibility is to fill the water recycling device with water. For example, external water can be introduced into the water recycling device. This can be achieved by setting the valve device to receive external water as an input, setting the drain valve device to prevent water from flowing into the drain path, and providing a flow of water in the water recycling device by the circulation pump. The external water can be allowed to fill the water recycling device to a certain level such that the external water is introduced into the heating device.

[0119] Now refer to Figure 12, the drain valve device can be set to allow water to flow into the drain path so that the water recycling device can be emptied. In this case, the circulation pump can be turned off. Thus, water can be discharged from the treatment path via the heating device, the water treatment device, the drain path, and the R / E path to the drain pipe and then to the drain discard pipe. When emptying the water recycling device, air can be drawn in through the outlet to balance the pressure inside the water recycling device. The air drawn in through the outlet can help keep the water treatment device dry, thereby reducing the likelihood of microbial growth in the water treatment device.

[0120] Now refer to Figure 13 , the used water and / or external water can be circulated through the treatment path, the drain path, and the return path. This can be achieved by first supplying the used water and / or external water to the water recycling device. Subsequently, the valve device can be set to receive only the water received from the return path. The drain valve device can be set to allow water to flow into the drain path. The circulation pump can provide the flow for circulating water through the treatment path, the drain path, and the return path.

[0121] Now refer to Figure 14 , a method for emptying the water recycling device is shown in the flowchart. The method includes step 1742 of supplying the water in the water recycling device to the drain pipe via the drain path and / or the return / drain path.

[0122] The following describes a method for emptying the water recycling device. The water recycling device can include: an outlet configured to output treated water; a drain pipe for collecting the used water output from the outlet; a return / drain path in liquid communication with the drain pipe, where the return / drain path includes an inlet for receiving the water collected through the drain pipe; a return path in liquid communication with the return / drain path; a treatment path in liquid communication with the return path and the outlet; an external water path in liquid communication with the treatment path, the external water path being connected to an external water outlet; a valve device, where the valve device is configured to receive the used water from the return path and / or the external water from the external water path as inputs, the valve device is placed between the return path and the treatment path, the valve device is configured to direct the inputs to the treatment path, and the valve device is configured to mix the external water with the used water from the return path; a circulation pump for providing flow in the water recycling device; a water treatment device placed downstream of the valve device; and a drain path in liquid communication with the treatment path, where the drain path is placed downstream of the circulation pump and upstream of the water treatment device. The method can include the step of supplying the water in the water recycling device to the drain pipe via the drain path and / or the return / drain path. The step of supplying the water in the water recycling device to the drain pipe via the drain path and / or the return / drain path can be accomplished by gravity.

[0123] The following describes a method for a water recycling device. The water recycling device may include: an outlet configured to output treated water; a drain pipe for collecting the used water output from the outlet; a return / drain path in liquid communication with the drain pipe, wherein the return / drain path includes an inlet for receiving the water collected through the drain pipe; a return path in liquid communication with the return / drain path; a treatment path in liquid communication with the return path and the outlet; an external water path in liquid communication with the treatment path, the external water path being connected to an external water outlet; a valve device, wherein the valve device is configured to receive used water from the return path and / or external water from the external water path as inputs, the valve device is disposed between the return path and the treatment path, the valve device is configured to direct the inputs to the treatment path, and the valve device is configured to mix the external water with the used water from the return path; a circulation pump for providing flow in the water recycling device; a water treatment device disposed downstream of the valve device; and a drain path in liquid communication with the treatment path, wherein the drain path is disposed downstream of the circulation pump and upstream of the water treatment device. The method may include the steps of: providing the water recycling device with used water, external water, or a combination of used water and external water; and draining the water recycling device according to the method for draining the water recycling device described above.

[0124] The step of providing the water recycling device with used water, external water, or a combination of used water and external water may include the sub-step of at least partially filling the water treatment device with used water, external water, or a combination of used water and external water.

[0125] The step of providing the water recycling device with used water, external water, or a combination of used water and external water may include the sub-step of circulating used water, external water, or a combination of used water and external water in the drain path, the return path, and at least a portion of the treatment path.

[0126] The water recycling device may further include a heater device disposed downstream of and / or in combination with the water treatment device, and the step of providing the water recycling device with used water, external water, or a combination of used water and external water may include the sub-step of heating used water, external water, or a combination of used water and external water in the heating device.

[0127] The inventive concept has been mainly described above with reference to some embodiments. However, as will be readily understood by those skilled in the art, other embodiments different from the embodiments disclosed above are equally possible within the scope of the inventive concept defined by the appended claims.

[0128] List of reference numerals 1100 Recirculation loop 1102 Sprinkler head 1104 Drain pipe 1106 Valve 1107 Valve 1108 Waste water pipe 1110 Pump 1112 Drinking water source 1200 Water recycling device 1216 Drain pipe 1218 Inlet 1220 Return / drain path 1222 Return path 1224 External water path 1226 Valve device 1228 Circulation pump 1230 Treatment path 1232 Water treatment device 1234 Drain path 1236 Heating device 1238 Outlet 1240 Valve discard path 1242 Drain pipe discard path 1300 Water recycling device 1322 Return path 1324 External water path 1326 First valve device 1327 Second valve device 1330 Treatment path 1340 Valve discard path Step of supplying water to the drain pipe via the drain path and / or the return / drain path Clause 1. A water recycling device, comprising: An outlet configured to output treated water; A drain pipe for collecting used water output from the outlet; A return / drain path in liquid communication with the drain pipe, wherein the return / drain path includes an inlet for receiving water collected by the drain pipe; A return path in liquid communication with the return / drain path; A treatment path in liquid communication with the return path and the outlet; An external water path in liquid communication with the treatment path, the external water path being connected to an external water outlet; A valve device configured to receive used water from the return path and / or external water from the external water path as an input, the valve device being disposed between the return path and the treatment path, the valve device being configured to direct the input to the treatment path, the valve device being configured to mix the external water with the used water from the return path; A circulation pump for providing flow in the water recycling device; and A water treatment device disposed downstream of the valve device.

[0129] 2. The water recycling device according to any one of the preceding clauses, further comprising a heating device disposed downstream of the water treatment device.

[0130] 3. The water recycling device according to clause 1 or 2, further comprising a drain path in liquid communication with the treatment path, wherein the drain path is disposed downstream of the valve device and upstream of the water treatment device.

[0131] 4. The water recycling device according to clause 3, wherein the water recycling device is configured to circulate water in at least a portion of the treatment path, the drain path, and the return path.

[0132] 5. The water recycling device according to any one of the preceding clauses, wherein the return / drain path is configured to be in a first state and a second state, in the first state, the water in the return / drain path is allowed to flow in a direction away from the drain pipe, and in the second state, the water in the return / drain path is allowed to flow in a direction towards the drain pipe.

[0133] 6. A water recycling shower, comprising the water recycling device according to any one of clauses 1 to 5.

[0134] 7. A method for draining a water recycling device, the water recycling device comprising: An outlet configured to output treated water; A drain pipe for collecting the used water output from the outlet; A return / drain path in liquid communication with the drain pipe, wherein the return / drain path includes an inlet for receiving the water collected through the drain pipe; A return path in liquid communication with the return / drain path; A treatment path in liquid communication with the return path and the outlet; An external water path in liquid communication with the treatment path, the external water path being connected to an external water outlet; A valve device, wherein the valve device is configured to receive used water from the return path and / or external water from the external water path as an input, the valve device is disposed between the return path and the treatment path, the valve device is configured to direct the input to the treatment path, and the valve device is configured to mix the external water with the used water from the return path; A circulation pump for providing flow in the water recirculation device; A water treatment device disposed downstream of the valve device; and A drain path in liquid communication with the treatment path, wherein the drain path is disposed downstream of the circulation pump and upstream of the water treatment device; Wherein the method comprises the steps of: Supplying water in the water recirculation device to the drain pipe via the drain path and / or the return / drain path.

[0135] 8. The method according to clause 7, wherein the step of supplying water in the water recirculation device to the drain pipe via the drain path and / or the return / drain path is accomplished by gravity.

[0136] 9. A method for cleaning a water recirculation device, the water recirculation device comprising: An outlet configured to output treated water; A drain pipe for collecting the used water output from the outlet; A return / drain path in liquid communication with the drain pipe, wherein the return / drain path includes an inlet for receiving water collected by the drain pipe; A return path in liquid communication with the return / drain path; A treatment path in liquid communication with the return path and the outlet; An external water path in liquid communication with the treatment path, the external water path being connected to an external water outlet; A valve device, wherein the valve device is configured to receive used water from the return path and / or external water from the external water path as an input, the valve device is disposed between the return path and the treatment path, the valve device is configured to direct the input to the treatment path, and the valve device is configured to mix the external water with the used water from the return path; A circulation pump for providing flow in the water recirculation device; A water treatment device disposed downstream of the valve device; and A drain path, which is in liquid communication with the treatment path, wherein the drain path is disposed downstream of the circulation pump and upstream of the water treatment device; The method includes the following steps: Providing the used water, the external water, or a combination of the used water and the external water to the water recycling device; and Draining the water recycling device according to the method of clause 7 or 8.

[0137] 10. The method for cleaning a water recycling device according to clause 9, wherein the step of providing the used water, the external water, or the combination of the used water and the external water to the water recycling device includes the sub-step of at least partially filling the water treatment device with the used water, the external water, or the combination of the used water and the external water.

[0138] 11. The method for cleaning a water recycling device according to clause 9 or 10, wherein the step of providing the used water, the external water, or the combination of the used water and the external water to the water recycling device includes the sub-step of circulating the used water, the external water, or the combination of the used water and the external water in at least a part of the drain path, the return path, and the treatment path.

[0139] 12. The method for cleaning a water recycling device according to any one of clauses 9 to 11, wherein the water recycling device further includes a heater device, the heater device is disposed downstream of the water treatment device and / or combined with the water treatment device, and the step of providing the used water, the external water, or the combination of the used water and the external water to the water recycling device includes the sub-step of heating the used water, the external water, or the combination of the used water and the external water in the heating device.

Claims

1. A method for recycling water in a water recycling device (200), the method comprising: Receiving used water via a drain pipe (216) in the water recycling device (200); Determining a water quality measurement of the used water; If the water quality measurement of the used water is higher than a first quality threshold, supplying the used water to a valve device (226) in the water recycling device (200); In the valve device (226), forming water to be treated by providing external water, the used water, or a combination of the external water and the used water; Generating treated water by treating the water to be treated using a water treatment device (232) in the water recycling device (200); and Supplying the treated water to an outlet (238) in the water recycling device (200), Characterized in that: The step of forming water to be treated by providing external water, the used water, or a combination of the external water and the used water comprises the following sub-steps: If the water quality measurement is lower than the first quality threshold and a second quality threshold, only providing the external water to form the water to be treated, If the water quality measurement is higher than the first quality threshold but lower than the second quality threshold, providing the combination of the external water and the used water to form the water to be treated, or If the water quality measurement is higher than the first quality threshold and the second quality threshold, only providing the used water to form the water to be treated.

2. The method according to claim 1, wherein The step of forming water to be treated by providing external water, the used water, or a combination of the external water and the used water comprises the following sub-steps: If the water quality measurement is lower than the first quality threshold, only providing the external water to form the water to be treated, or If the water quality measurement is higher than the first quality threshold, only providing the used water to form the water to be treated.

3. The method according to any one of the preceding claims, wherein, The step of generating treated water by treating the water to be treated using a water treatment device (232) comprises the following sub-steps: Filtering the water to be treated, and Reducing the harmful effects of microorganisms in the water to be treated by using UV light.

4. A water recycling device (200), comprising: An outlet (238) configured to output treated water; A drain pipe (216) for collecting used water output from the outlet (238); A return path (222) in liquid communication with the drain pipe (216); A treatment path (230) in liquid communication with the return path (222) and the outlet (238); An external water path (224) in liquid communication with the treatment path (230), the external water path (224) being connected to an external water outlet; A sensor device configured to determine a water quality measurement of the water in the water recycling device; A valve device (226) configured to receive as input the used water from the return path (222) and / or external water from the external water path (224), the valve device (226) being disposed between the return path (222) and the treatment path (230), the valve device (226) being configured to direct the input to the treatment path (230), and the valve device (226) being configured to mix the external water with the water from the return path (222); A circulation pump (228) for providing flow in the water recirculation device (200); A water treatment device (232) disposed downstream of the valve device (226); The water recirculation device (200) is characterized in that: The valve device is configured to direct the following to the water treatment device: If the water quality measurement is below a first quality threshold, only direct the external water; If the water quality measurement is above the first quality threshold but below a second quality threshold, direct a combination of the external water and the used water; or If the water quality measurement of the used water is above the first quality threshold and the second quality threshold, only direct the used water.

5. The water recirculation device according to claim 4, further comprising a heating device disposed downstream of and / or in combination with the water treatment device, wherein the heating device is integrated with a UV light treatment device into a single unit.

6. The water recirculation device (200) according to claim 4 or 5, wherein The water treatment device (232) includes a filter device.

7. The water recirculation device (200) according to any one of claims 4 to 6, further comprising a valve discard path (240) configured to discharge water from the water recirculation device (200), wherein the valve device (226) is further configured to direct the water from the return path (222) to the valve discard path (240).

8. The water recirculation device (200) according to any one of claims 4 to 7, wherein, The drain pipe (216) includes a drain pipe discard path (242) configured to discharge used water from the water recirculation device (200).

9. The water recycling device according to any one of claims 4 to 8, wherein, The valve device includes at least a first valve device and a second valve device, wherein the first valve is configured to receive the used water from the return path as input, the first valve device is configured to direct the used water from the return path to the treatment path, and wherein the second valve device receives the external water from the external water path as input, and the second valve device is configured to direct the external water to the treatment path.

10. A water recirculation shower including the water recirculation device (200) according to any one of claims 4 to 9.

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