Water treatment device, water heater and purified drinking hot water equipment

Abstract

The invention belongs to the technical field of water supply, and particularly discloses a water treatment device, a water heater and purified hot water drinking equipment. The water treatment device comprises a shell and polarization pieces, the shell is provided with a water containing cavity, a water inlet and a water outlet, and the multiple polarization pieces are located in the water containing cavity at intervals; the polarization piece comprises a plurality of polarization parts which are oppositely arranged at intervals, each polarization part has an inclined included angle relative to the flow passing surface where the polarization piece is located, and the inclined included angles corresponding to every two adjacent polarization pieces are different; or the polarization piece comprises a plurality of polarization parts which are arranged around the preset axis at intervals, and in every two adjacent polarization pieces from the water inlet to the water outlet, the polarization part of one polarization piece is inclined in the clockwise direction, and the polarization part of the other polarization piece is inclined in the anticlockwise direction. According to the invention, the precipitation probability of substances in water can be reduced, the probability of scale production is reduced, the maintenance and cleaning requirements of the water treatment device are reduced, and the use experience of the water heater and the purified drinking hot water equipment is improved.

Description

Technical Field

[0001] This invention relates to the field of water supply technology, and in particular to a water treatment device, a water heater, and a purified drinking water and hot water equipment. Background Technology

[0002] Gas water heaters are household appliances that use gas to heat water flowing through heat exchange tubes to provide hot water. Because tap water contains many impurities, especially when gas water heaters are used in areas with poor water quality, scale can easily build up inside the heat exchange tubes over time. This affects the water flow and thermal efficiency of the heat exchange tubes, and may even cause pipe blockage.

[0003] The prior art provides a gas water heater, which includes a water heater shell, a water inlet pipe connector at the bottom of the water heater shell, and a purification device inside the water inlet pipe connector. The purification device includes a magnetic ring and a scale-inhibiting filter screen. The magnetic ring is used to adsorb iron filings and impurities in the water, and the scale-inhibiting filter screen is filled with scale-inhibiting filter media to filter and purify impurities in the water.

[0004] Existing gas water heaters can purify the water flowing into the heat exchange tubes, but because the purification device uses magnetic rings and filters to adsorb impurities, these impurities accumulate inside the purification device. This requires the purification device to be cleaned and replaced regularly, increasing the inconvenience for users. Summary of the Invention

[0005] One of the technical problems solved by this invention is to provide a water treatment device that can effectively solve the problem of the need for regular cleaning of existing water treatment devices due to the accumulation of impurities inside the device, thereby improving the ease of use of the water treatment device.

[0006] The second technical problem solved by this invention is to provide a water heater that can effectively solve the problem of reduced ease of use caused by the need for regular cleaning of water treatment devices in existing water heaters. While reducing the probability of scale buildup in the water heater pipes, it also improves the ease of use of the water heater.

[0007] The third technical problem solved by this invention is to provide a water purification and hot water equipment that can effectively solve the problem of inconvenience caused by the need for regular cleaning or replacement of the water treatment device in existing water purification and hot water equipment, thereby improving the ease of use of the water purification and hot water equipment.

[0008] The first technical problem mentioned above is solved by the following technical solution:

[0009] A water treatment apparatus, comprising:

[0010] A water treatment device includes a housing and a polarizing element. The housing has a water-containing cavity, an inlet, and an outlet. The inlet and the outlet are both connected to the water-containing cavity. The polarizing element is located inside the water-containing cavity and is arranged in multiple ways at intervals along the inlet to the outlet.

[0011] The polarizing element includes a plurality of polarizing components arranged opposite to each other and spaced apart. Each polarizing component has an inclined angle relative to the flow surface on which the polarizing component is located, and the inclined angles of two adjacent polarizing components are different; or, the polarizing element includes a plurality of polarizing components arranged at intervals around a preset axis, from the inlet to the outlet. Each polarizing component is inclined in a clockwise or counterclockwise direction, and in two adjacent polarizing components, the polarizing component of one polarizing component is inclined in a clockwise direction, and the polarizing component of the other polarizing component is inclined in a counterclockwise direction.

[0012] The water treatment device of the present invention has the following advantages compared with the prior art: Because multiple polarizing elements are arranged at intervals from the inlet to the outlet, when the water flows through the polarizing elements, substances containing calcium, magnesium, iron, and other elements in the water flow form ionic states that are not easily precipitated under the polarization effect of the polarizing elements. This results in the water flowing out of the outlet being mostly composed of ionic substances that are not easily precipitated, reducing the probability of substances precipitating in subsequent pipelines. Furthermore, it eliminates the need for cleaning and replacement of the water treatment device due to the accumulation of substances in the device. While reducing the probability of scale formation, it also improves water quality. The performance of the treatment device is improved. Furthermore, because multiple polarizing elements are arranged alternately from the inlet to the outlet, and each polarizing element is inclined, the water flow changes direction when passing between the inlets of adjacent polarizing elements, creating turbulence. This increases the contact area and contact time between the water flow and the polarizing elements, improving polarization ionization efficiency. Moreover, because the polarizing elements of adjacent polarizing elements are inclined in opposite directions, the water flow easily forms swirling currents when passing from one polarizing element to another, increasing the turbulence effect on the water flow and further enhancing the polarization ionization effect on the water flow.

[0013] In one embodiment, all the tilt angles of the same polarizing element have the same opening orientation and size, while the tilt angles of different polarizing elements have opposite opening orientations.

[0014] And / or, the angle of inclination is 25° to 60°.

[0015] In one embodiment, the cross-section of the water-containing cavity is circular, and the preset axis passes perpendicularly through the circular cross-section where the polarizing element is located;

[0016] The angle between the polarization component and the flow plane perpendicular to the preset axis is 25° to 60°.

[0017] In one embodiment, the polarization component has a preset angle with the flow plane perpendicular to the preset axis, and in the same polarization component, the preset angle of all polarization components is the same.

[0018] And / or, the polarizing element includes a central disk portion and a mounting ring portion arranged coaxially, the polarizing element is connected between the central disk portion and the mounting ring portion and is arranged in a plurality of portions at circumferential intervals along the central disk portion, and the mounting ring portion is mounted on the inner wall of the housing.

[0019] In one embodiment, the housing extends along a first direction, and the inlet and the outlet are located at opposite ends of the housing along the first direction.

[0020] The flow surface is perpendicular to the first direction; or, the preset axis is set along the first direction.

[0021] In one embodiment, in a projection plane perpendicular to the first direction, the polarization components of two adjacent polarization components are staggered.

[0022] In one embodiment, the wall of the water-containing cavity has a mounting groove, and the mounting groove is provided in a one-to-one correspondence with the polarizing element, with the periphery of the polarizing element inserted into the mounting groove.

[0023] The second technical problem mentioned above is solved by the following technical solution:

[0024] A water heater includes a heating body and a cold water inlet pipe connected to the water inlet end of the heating body. It is characterized by including a water treatment device as described above, wherein the water inlet end of the heating body and the water outlet are connected via the cold water inlet pipe, and the water inlet is connected to a cold water supply pipe, which is used to connect to the cold water supply end.

[0025] Compared with the prior art, the water heater described in this invention has the following advantages: by adopting the above-mentioned water treatment device, the scale formation in the heating body and the downstream pipe of the water treatment device can be reduced, thereby reducing the probability of water heater failure caused by pipe blockage and improving the reliability of water heater use. At the same time, there is no need to clean and replace the water treatment device due to the presence of substances inside the water treatment device, thus improving the convenience and reliability of water heater use.

[0026] In one embodiment, the outlet end of the heating body is connected to a hot water outlet pipe, and a return water pipe is connected between the hot water outlet pipe and the inlet or the cold water supply pipe.

[0027] The third technical problem mentioned above is solved by the following technical solution:

[0028] A water purification and hot water device, comprising:

[0029] As described above, in the water treatment device, the inlet is connected to a cold water supply pipe;

[0030] The heating body is connected to the water inlet and the water outlet via a cold water inlet pipe.

[0031] The water purification module includes a filter device, a filter inlet pipe, and a concentrate pipe. The inlet end of the filter inlet pipe is connected to the outlet, and the outlet end of the filter inlet pipe is connected to the raw water inlet of the filter device. The concentrate pipe is connected between the concentrate outlet of the filter device and the inlet. The pure water outlet of the filter device is connected to a pure water pipe, which is used to supply filtered pure water to the drinking water end.

[0032] In one embodiment, the housing includes two water inlets, namely a first water inlet and a second water inlet, wherein the first water inlet is connected to the outlet end of the cold water supply pipe, and the second water inlet is connected to the outlet end of the concentrate pipe.

[0033] And / or, the housing includes two water outlets, namely a first water outlet and a second water outlet, wherein the first water outlet is connected to the inlet end of the cold water inlet pipe, and the second water outlet is connected to the inlet end of the filter inlet pipe. Attached Figure Description

[0034] Figure 1 This is a schematic diagram of the water treatment device provided in Embodiment 1 of the present invention;

[0035] Figure 2 This is a cross-sectional view of the water treatment device provided in Embodiment 1 of the present invention;

[0036] Figure 3 for Figure 2 A magnified view of a section at point I;

[0037] Figure 4 This is a schematic diagram of the structure of the polarization element provided in Embodiment 1 of the present invention;

[0038] Figure 5 This is a cross-sectional view of the polarization element provided in Embodiment 1 of the present invention;

[0039] Figure 6 This is a schematic diagram of the disassembled structure of the water treatment device provided in Embodiment 1 of the present invention;

[0040] Figure 7This is a partial structural schematic diagram of the water treatment device provided in Embodiment 1 of the present invention;

[0041] Figure 8 This is a schematic diagram of the structure of a water heater provided in Embodiment 3 of the present invention;

[0042] Figure 9 This is a schematic diagram of the structure of the water purification and hot water equipment provided in Embodiment 4 of the present invention.

[0043] Label Explanation:

[0044] 100. Water heater; 200. Water purification module; 201. Filter device; 202. Filter inlet pipe; 203. Inlet control valve; 204. Booster pump; 205. Concentrate pipe; 206. Drain control valve; 207. Pure water pipe; 2071. Pure water main pipe; 2072. First branch pipe; 2073. Second branch pipe; 208. Pure water check valve; 209. Pressure switch; 210. Connecting pipe; 211. Water distributor; 212. Heating control valve; 213. Zero-pressure valve; 214. Auxiliary water pump; 215. Inlet flow meter; 216. Inlet thermometer; 217. Outlet thermometer; 218. Water vapor separator; 219. Heating component; 220. Normal temperature purified drinking water terminal; 230. Hot water purified drinking water terminal; 300. Cold water supply terminal; 400. Domestic water terminal;

[0045] 1. Water treatment device; 11. Shell; 111. Main cylinder; 111a. Semi-cylinder; 112. Inlet pipe section; 1121. Inlet; 1121a. First inlet; 1121b. Second inlet; 113. Outlet pipe section; 1131. Outlet; 1131a. First outlet; 1131b. Second outlet; 114. Rib section; 115. Water-containing cavity; 116. Mounting groove; 12. Polarizing element; 121. Polarizing component; 1211. Drainage surface; 122. Central disc section; 123. Mounting ring section; 124. Water inlet;

[0046] 2. Heating unit; 3. Cold water supply pipe; 4. Cold water inlet pipe; 5. Hot water outlet pipe; 6. Return water pipe; 7. Return water control valve; 8. Return water check valve; 9. Flow sensor; 10. Drive water pump. Detailed Implementation

[0047] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0048] In the description of this application, it should be understood that the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0049] The terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, unless otherwise stated, "a plurality of" means two or more.

[0050] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection between two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0051] Example 1

[0052] like Figures 1 to 7 As shown, this embodiment provides a water treatment device 1, which adopts the principle of ion polarization scale inhibition to reduce the probability of precipitation of substances in the water flowing through the water treatment device 1, thereby reducing the probability of scale formation. At the same time, it eliminates the need for frequent maintenance and replacement of the water treatment device 1, improving the ease of use of the water treatment device 1.

[0053] like Figures 1 to 4As shown, in this embodiment, the water treatment device 1 includes a housing 11 and a polarization assembly. The housing 11 has a water-containing cavity 115, an inlet 1121, and an outlet 1131, both of which are connected to the water-containing cavity 115. The polarization assembly includes multiple polarizing elements 12 disposed within the water-containing cavity 115, spaced apart sequentially from the inlet 1121 to the outlet 1131. Each polarizing element 12 includes multiple polarizing components 121 spaced apart around a predetermined axis, extending from the inlet 1121 to the outlet 1131. Each polarizing component 121 is inclined clockwise or counterclockwise, and in two adjacent polarizing elements 12, the polarizing components 121 of one polarizing element 12 are inclined clockwise, while those of the other polarizing element 12 are inclined counterclockwise. The polarizing components 121 are used to polarize and ionize the water flowing through them.

[0054] The water treatment device 1 provided in this embodiment has multiple polarizing elements 12 spaced along the inlet 1121 to the outlet 1131. When water flows through the polarizing elements 12, substances containing calcium, magnesium, iron, etc., in the water flow form ionic states that are not easily precipitated under the polarization effect of the polarizing elements 121. This results in the water flowing out of the outlet 1131 being mostly ionic substances that are not easily precipitated, reducing the probability of substances precipitating in subsequent pipelines. Furthermore, it eliminates the need for cleaning and replacement of the water treatment device 1 due to the accumulation of substances in the device. This reduces the probability of scale formation and improves the performance of the water treatment device 1. Simultaneously, because the multiple polarizing elements 12 are arranged at intervals from the inlet 1121 to the outlet 1131... The components 11 to 1131 are arranged at intervals, and each polarizing component 121 is inclined, so that the water flow changes its flow direction when it flows between the water inlets 124 between two adjacent polarizing components 121, forming turbulence, thereby increasing the contact area and contact time between the water flow and the polarizing component 121, and improving the polarization ionization efficiency. Furthermore, since the polarizing component 121 of one polarizing component 12 is inclined in a clockwise direction and the polarizing component 121 of the other polarizing component 12 is inclined in a counterclockwise direction, the water flow is more likely to form a swirling flow when it flows through one polarizing component 12 and then through the other polarizing component 12, increasing the turbulence effect on the water flow, thereby further enhancing the polarization ionization effect on the water flow.

[0055] It is worth noting that the polarization component 121 is made of a catalyst alloy. The catalyst alloy shell continuously releases free electrons into the water, thereby preventing the aggregation of scale anions such as carbonate and bicarbonate and cations such as calcium and magnesium in the water, thus achieving scale inhibition of the water body.

[0056] To further clarify, "the polarizing component 121 tilts clockwise" means that the polarizing component 121 tilts clockwise along the circumference of the polarizing element 12 from the side closest to the inlet 1121 to the side furthest from the outlet 1131. "The polarizing component 121 tilts counterclockwise" means that the polarizing component 121 tilts counterclockwise along the circumference of the polarizing element 12 from the side closest to the inlet 1121 to the side furthest from the outlet 1131. Clockwise refers to viewing along a predetermined axis towards the inlet 1121 or outlet 1131, while counterclockwise is the opposite of clockwise rotation.

[0057] The outer contour of the polarizing element 12 is adapted to the cross-sectional shape of the water-containing cavity 115 to facilitate the stable installation of the polarizing element 12 in the water-containing cavity 115, and to enable multiple polarizing elements 12 to divide the water-containing cavity 115 into multiple sub-water cavities, and the water flow can basically only flow between two adjacent sub-water cavities through the water inlet 124, increasing the contact area between the water flow and the polarizing element 12.

[0058] like Figure 2 and Figure 6 As shown, in one embodiment, the water-receiving cavity 115 has a circular cross-section, with a preset axis perpendicular to the circular cross-section where the polarizing element 12 is located. This allows the polarizing element 12 to be configured as a disc-shaped structure adapted to the water-receiving cavity 115, facilitating the arrangement of multiple polarizing components 121 on the polarizing element 12 and simplifying the structural configuration of the polarizing element 12. In other embodiments, the cross-section of the water-receiving cavity 115 may also be elliptical, rectangular, or other shapes.

[0059] In one embodiment, the housing 11 extends along a first direction, with an inlet 1121 and an outlet 1131 respectively located at both ends of the housing 11 along the first direction, and a preset axis extending along the first direction. This allows the housing 11 to have an elongated structure arranged along the first direction, resulting in a simpler shape. Specifically, multiple polarizing elements 12 are spaced apart along the first direction, and the preset axes of all polarizing elements 12 coincide. This simplifies the structure of the housing 11 and improves the ease of arranging the polarizing elements 12 inside the housing 11.

[0060] In other embodiments, the housing 11 can be an arc-shaped, zigzag-shaped, or other elongated structure, with the inlet 1121 and outlet 1131 located at both ends of the elongated structure. Multiple polarizing elements 12 can be spaced apart along the extension direction of the elongated structure. In this arrangement, each polarizing element 12 has a different preset axis, and the preset axis of the polarizing element 12 is perpendicular to the mounting plane of the polarizing element 12.

[0061] Let the plane perpendicular to the preset axis be the flow plane. To further simplify the setting of the polarizing element 12, in one embodiment, the included angle between the polarizing element 121 and the flow plane is defined as the preset included angle. In the same polarizing element 12, the preset included angle of all polarizing elements 121 is the same, thereby making the arrangement of polarizing elements 121 on the polarizing element 12 consistent, which is beneficial to the processing of the polarizing element 12.

[0062] like Figures 3 to 5 As shown, furthermore, all polarizing elements 12 have the same preset included angle, that is, among two adjacent polarizing elements 12, only the tilting direction of the polarizing component 121 of the two polarizing elements 12 is different, but the tilting angle is the same.

[0063] The polarization component 121 has two flow-guiding surfaces 1211 that are opposite to and spaced apart along a predetermined axial direction. Both flow-guiding surfaces 1211 are inclined relative to the flow plane, and the inclination angles between the two flow-guiding surfaces 1211 and the flow plane are approximately the same. This makes the polarization component 121 as a whole inclined relative to the flow plane, which is beneficial for the processing of the polarization component 121. In one embodiment, the flow-guiding surface 1211 is a smooth curved surface; in other embodiments, the flow-guiding surface 1211 may also be a straight inclined surface structure.

[0064] In one embodiment, the polarization component 121 is tilted at an angle of 25° to 60° relative to the flow plane, thereby avoiding the loss of the turbulence effect due to an excessively large tilt angle, and also avoiding the problem of backflow due to an excessively small tilt angle.

[0065] It is worth noting that when the flow-guiding surface 1211 is an inclined surface, the inclination angle is the angle between the inclined surface and the flow plane; when the flow-guiding surface 1211 is a smooth curved surface, the inclination angle of the polarization component 121 relative to the flow plane is the angle between the plane passing through both ends of the inclination direction of the flow-guiding surface 1211 and the flow plane.

[0066] Preferably, multiple polarizing components 121 are evenly spaced around a predetermined axis, and the number of polarizing components 121 is preferably one to two. Increasing the number of polarizing components 121 increases the contact area between the polarizing components 121 and the water flow, thus avoiding excessive resistance when water flows through the polarizing components 121. It is worth noting that the number of polarizing components 12 can be adaptively set according to the length of the water treatment device 1, and the number of polarizing components 121 on a single polarizing component 12 can be adaptively set according to the cross-sectional size of the water-containing cavity 115. This invention does not impose specific limitations in this regard.

[0067] To improve the ease and stability of installing the polarizing element 12 in the water-receiving cavity 115, the cavity wall of the water-receiving cavity 115 has mounting grooves 116, each corresponding to a polarizing element 12, with the periphery of the polarizing element 12 inserted into the mounting groove 116. This installation of the periphery of the polarizing element 12 within the mounting groove 116 restricts its movement along the first direction within the water-receiving cavity 115, thereby improving the installation stability of the polarizing element 12 in the water-receiving cavity 115.

[0068] In one embodiment, the cavity wall of the water-containing cavity 115 is provided with a plurality of rib groups, each rib group corresponding to a plurality of polarizing elements 12. Each rib group includes two opposing and spaced-apart rib portions 114, with a mounting groove 116 formed between the two rib portions 114. This arrangement eliminates the need to thin the local structure of the main cylinder 111 to achieve the mounting groove 116, and also enhances the overall structural strength and rigidity of the shell 11 through the rib portions 114, improving the structural stability of the shell 11 and thus enhancing the reliability of the water treatment device 1.

[0069] To improve the ease of installation of the polarizing element 12, the polarizing element 12 includes a coaxially arranged central disk portion 122 and a mounting ring portion 123. Multiple polarizing components 121 are connected between the central disk portion 122 and the mounting ring portion 123 and are spaced apart circumferentially along the central disk portion 122. The mounting ring portion 123 is mounted on the inner wall of the housing 11. This arrangement facilitates the fit between the polarizing element 12 and the housing 11 through the mounting ring portion 123, while ensuring the overall structural strength and rigidity of the polarizing element 12.

[0070] The central disc 122, polarizing component 121, and mounting ring 123 are integrally formed to better ensure the overall structural strength and rigidity of the polarizing component 12, preventing damage to the polarizing component 12 under the impact of water flow. Simultaneously, this design allows the central disc 122 to also polarize and ionize substances in the water, thereby enhancing the polarization and ionization effect of the polarizing component 12 on substances in the water and improving the scale inhibition effect of the water treatment device 1. In other embodiments, the polarizing component 121 can be welded to the central disc 122 and / or the mounting ring 123 or detachably connected.

[0071] like Figure 6 and Figure 7 As shown, in one embodiment, the housing 11 includes a main cylinder 111, the inner cavity of which forms a water-containing cavity 115. The cross-section of the housing 11 is circular to facilitate the processing and shaping of the housing 11. In other embodiments, the cross-section of the housing 11 can be rectangular, elliptical, or other shapes, as long as it can meet the requirements for the installation of the polarization component inside the housing 11.

[0072] To improve the ease of installation of the water treatment device 1 on the pipeline, an inlet pipe section 112 is provided at one end of the main cylinder 111. The inner cavity of the inlet pipe section 112 communicates with the water-containing chamber 115, and the port of the inlet pipe section 112 forms an inlet 1121. An outlet pipe section 113 is provided at the other end of the main cylinder 111. The inner cavity of the outlet pipe section 113 communicates with the water-containing chamber 115, and the port of the outlet pipe section 113 forms an outlet 1131. The inlet pipe section 112 and the outlet pipe section 113 are used to connect with external pipelines to facilitate the installation of the water treatment device 1. The inlet pipe section 112 and the outlet pipe section 113 can be connected to the external pipeline by threaded connection, interference fit, sealing snap-fit, or other connection methods. This embodiment does not limit this.

[0073] To improve the ease of assembling and disassembling the polarizing element 12 inside the housing 11, in one embodiment, the housing 11 includes two half-shells that are interlocked with each other, forming a water-containing cavity 115, with each polarizing element 12 sandwiched between the two half-shells. Thus, the polarizing element 12 can be assembled and disassembled inside the water-containing cavity 115 by assembling and disassembling the two half-shells. Furthermore, a sealing ring is provided at the interlocking surfaces of the two half-shells to seal the connection between them. The two half-shells are preferably, but not limited to, connected by screws to ensure connection stability. In another embodiment, the housing 11 includes a detachably connected mounting cylinder and an end cap. At least one end of the mounting cylinder is open, and an end cap is installed at the open end of the mounting cylinder. All polarizing elements 12 are installed inside the mounting cylinder. In this configuration, by removing the end cap from the mounting cylinder, at least one end of the mounting cylinder is opened, thereby allowing the polarizing element 12 to be installed inside the mounting cylinder.

[0074] In one embodiment, two inlets 1121 are provided, namely a first inlet 1121a and a second inlet 1121b, thereby increasing the number of inlet pipes that the water treatment device 1 can connect to. Two outlets 1131 are provided, namely a first outlet 1131a and a second outlet 1131b, thereby increasing the drainage paths for the water flowing out of the water treatment device 1 and improving its ease of use. It is understood that in other embodiments, the number of inlets 1121 and outlets 1131 can be set according to requirements.

[0075] In one embodiment, the main cylinder 111 includes two interlocking semi-cylinders 111a. Each semi-cylinder 111a has an inlet pipe 112 and an outlet pipe 113 at both ends, forming a semi-shell with each semi-cylinder 111a and its inlet pipe 112 and outlet pipe 113. This makes the structures of the two semi-cylinders 111a basically the same, which facilitates the versatility of the semi-cylinders 111a and reduces the processing difficulty of the semi-cylinders 111a. Furthermore, the semi-cylinder 111a has a semi-cylindrical structure.

[0076] To further increase the contact area between the water flow and the polarizing element 12, in one embodiment, the projections of the polarizing components 121 of two adjacent polarizing elements 12 on the flow plane are staggered along a predetermined direction. Thus, when water flows from one polarizing element 12 to another, at least a portion of the water flow directly impacts the polarizing components 121 of the adjacent polarizing element 12, achieving the effect of turbulence and diversion of the water flow, thereby further increasing the contact area between the water flow and the polarizing element 12 and enhancing the polarization and ionization effect of the polarizing element 12 on the water flow.

[0077] Example 2

[0078] This embodiment provides a water treatment device 1, which adopts the principle of ion polarization scale inhibition to reduce the probability of precipitation of substances in the water flowing through the water treatment device 1, thereby reducing the probability of scale formation. At the same time, it eliminates the need for frequent maintenance and replacement of the water treatment device 1, improving the ease of use of the water treatment device 1.

[0079] Specifically, the water treatment device 1 in this embodiment includes a housing 11 and a polarizing element 12. The housing 11 has a water-containing cavity 115, an inlet 1121 and an outlet 1131. The inlet 1121 and the outlet 1131 are both connected to the water-containing cavity 115. The polarizing element 12 is located in the water-containing cavity 115 and multiple polarizing elements are arranged sequentially and spaced apart from the inlet 1121 to the outlet 1131. The polarizing element 12 includes multiple polarizing components 121 that are arranged opposite to each other and spaced apart. Each polarizing component 121 has an inclined angle relative to the flow surface where the polarizing element 12 is located, and the inclined angles of two adjacent polarizing components 12 are different.

[0080] That is, the difference between this embodiment and the above embodiment is that: in this embodiment, multiple polarization components 121 on a polarization component 12 are arranged opposite each other and spaced apart along a straight line.

[0081] The water treatment device 1 provided in this embodiment, due to the different inclination angles of the polarizing components 121 of the two polarizing elements 12, causes the water flow direction to change when the water flows out of one polarizing element 12 and passes between two adjacent polarizing components 121 of the other polarizing element 12. This improves the disturbance effect of the polarizing element 12 on the water flow, increases the contact time between the water flow and the polarizing component 121, and thus improves the polarization effect of the polarizing element 12 on the water flow. To reduce the processing difficulty of the polarizing element 12, in this embodiment, the inclination angle and opening orientation of all polarizing components 121 in the same polarizing element 12 are the same.

[0082] To enhance the turbulence effect on the water flow, the openings of the different polarization elements 12 at their respective tilt angles face opposite directions. This significantly alters the water flow direction when passing through the two polarization elements 12, facilitating the formation of vortices. Furthermore, the tilt angles of adjacent polarization elements 12 are the same to reduce the machining difficulty of the polarization elements 12. Further, the tilt angle is between 25° and 60°.

[0083] In other embodiments, the tilt angles of two adjacent water flow polarizers 12 may have the same opening direction, but the size of the tilt angles may be different.

[0084] Furthermore, the polarizing component 12 includes a mounting frame, on which both ends of the polarizing component 121 are mounted. The mounting frame is mounted on the housing 11 to improve the ease of installation of the polarizing component 121 on the housing 11.

[0085] It is worth noting that in this embodiment, the cross-section of the water-receiving cavity 115 is preferably rectangular, and the polarizing element 12 is preferably rectangular. However, in other embodiments, the cross-section of the water-receiving cavity 115 can be circular or other structures.

[0086] The specific structure of the housing 11 and the mounting structure of the polarizing element 12 on the housing 11 can be set with reference to Embodiment 1, and will not be repeated in this embodiment.

[0087] Example 3

[0088] like Figure 8 As shown, this embodiment provides a hot water device to reduce the probability of scale buildup in the pipes of the water heater 100 and improve the safety and reliability of the water heater 100.

[0089] In this embodiment, the water heater 100 includes a heating body 2, a cold water inlet pipe 4, a hot water outlet pipe 5, and the aforementioned water treatment device 1. The inlet and outlet 1131 of the heating body 2 are connected by the cold water inlet pipe 4. The inlet 1121 is connected to a cold water supply pipe 3, which is used to connect to the cold water supply end 300. The outlet of the heating body 2 is connected to the inlet of the hot water outlet pipe 5, and the outlet of the hot water outlet pipe 5 is connected to the domestic water supply end 400. The domestic water supply end 400 can be, but is not limited to, a bathroom water supply end, a faucet water supply end, etc.

[0090] The water heater 100 provided in this embodiment connects the water treatment device 1 in series between the cold water supply pipe 3 and the cold water inlet pipe 4. This ensures that tap water flows through the water treatment device 1 before reaching the heating element 2. As the tap water flows through the water treatment device 1, elements such as iron, manganese, calcium, and magnesium ions are converted into ions that are less prone to precipitation, thus reducing the probability of scale formation and clogging the water heater 100's pipes. This improves the reliability of the water heater 100 and extends its service life. Furthermore, because the water treatment device 1 uses polarization ionization to convert substances in the water into ions that are less prone to precipitation, rather than precipitating or filtering the substances, no substances accumulate in the water treatment device 1. Therefore, there is no need to periodically replace or clean the water treatment device 1, improving the convenience for users of the water heater 100.

[0091] In one embodiment, the water heater 100 is a gas water heater, and the heating element 2 is a heat exchanger. In another embodiment, the water heater 100 can also be an electric water heater, and the heating element 2 is an inner tank. In yet another embodiment, the water heater 100 can also be other types of water heaters, such as solar water heaters.

[0092] In one embodiment, the housing 11 of the water treatment device 1 is detachably connected to both the cold water supply pipe 3 and the cold water inlet pipe 4, thereby improving the ease of disassembly, assembly, and maintenance of the water treatment device 1, and also enhancing the ease of disassembly, inspection, and maintenance of the water heater 100. In other embodiments, the housing 11 is welded to the cold water supply pipe 3 and / or the cold water inlet pipe 4.

[0093] To further improve the performance of the water heater 100, in one embodiment, the water heater 100 includes a return water pipe 6. The inlet end of the return water pipe 6 is connected to the hot water outlet pipe 5, and the outlet end of the return water pipe 6 is connected to the inlet 1121 of the water treatment device 1 or the cold water supply pipe 3. A return water control valve 7 is provided on the return water pipe 6. Thus, when it is necessary to preheat or prevent the water in the pipes of the water heater 100 from freezing, the water treatment device 1, the cold water inlet pipe 4, the heating body 2, the hot water outlet pipe 5, and the return water pipe 6 can be sequentially connected to form a return water circulation pipe. The water is heated by the heating body 2 during the flow inside the return water circulation pipe, thereby achieving preheating, heat preservation, or freeze prevention of the water in the pipes of the water heater 100, realizing the zero cold water setting of the water heater 100, and improving the performance of the water heater 100.

[0094] In one embodiment, the connection between the inlet of the return water pipe 6 and the hot water outlet pipe 5 is located outside the water heater casing and close to the domestic water supply end 400. This arrangement allows most of the water in the hot water outlet pipe 5 to flow back to the heating element 2 through the return water pipe 6 for reheating, reducing the amount of cold water in the hot water outlet pipe 5 and achieving a better zero-cold-water effect. In other embodiments, the connection between the inlet of the return water pipe 6 and the hot water outlet pipe 5 can also be located inside the casing.

[0095] To prevent water in the cold water inlet pipe 4 from flowing back to the hot water outlet pipe 5 through the return pipe 6, in one embodiment, a return one-way valve 8 is also provided on the return pipe 6. The return one-way valve 8 only allows water in the return pipe 6 to flow through the return one-way valve 8 to the water treatment device 1, ensuring that water in the cold water inlet pipe 4 or the water treatment device 1 will not flow back to the hot water outlet pipe 5 through the return pipe 6.

[0096] Furthermore, a drive pump 10 is installed on the cold water inlet pipe 4. Thus, when the return water control valve 7 is disconnected, the drive pump 10 operates, and cold water sequentially flows through the cold water supply pipe 3, the water treatment device 1, and the cold water inlet pipe 4 into the heating body 2 for heating. When the return water control valve 7 is disconnected, the return water circulation pipe is open, and the water in the return water circulation pipe can circulate under the drive of the drive pump 10. This reduces the number of drive pumps 10 in the water heater 100, simplifies the structure, and lowers the drive cost.

[0097] A flow sensor 9 is also installed on the cold water inlet pipe 4 to detect the cold water inlet flow rate. The water heater 100 includes a controller, and the flow sensor 9 is communicatively connected to the controller. In one embodiment, the flow sensor 9 is installed on the cold water inlet pipe 4. In another embodiment, the flow sensor 9 is installed on the cold water supply pipe 3.

[0098] Example 4

[0099] This embodiment provides a water purification and hot water device that can not only provide hot water for domestic use, but also provide purified drinking water, thus meeting users' water needs in multiple ways and improving their water experience.

[0100] like Figure 9 As shown, the water purification and hot water equipment provided in this embodiment includes a water heater 100 and a water purification module 200. The water purification module 200 includes a filter device 201, which has a filter element, a raw water inlet, a concentrated water outlet, and a pure water outlet. The raw water inlet is connected to the outlet 1131 of the water treatment device 1 via a filter inlet pipe 202; the concentrated water outlet is connected to the inlet 1121 of the water treatment device 1 via a concentrated water pipe 205; and the pure water outlet is connected to a pure water pipe 207, which is connected to a purified drinking water supply end.

[0101] The hot water purification device provided in this embodiment connects the inlet end of the filter inlet pipe 202 to the outlet 1131 of the water treatment device 1, allowing water treated by the polarization process of the water treatment device 1 to flow into the filter device 201 through the filter inlet pipe 202. This reduces the sedimentation of substances in the filter inlet pipe 202 and lowers the probability of clogging. Simultaneously, it allows the water heater 100 and the water purification module 200 to share the cold water supply pipe 3 for water intake, simplifying the overall piping layout of the hot water purification device and reducing costs. Because the concentrated water outlet passes through the concentrated water... Water pipe 205 is connected to the inlet 1121 of water treatment device 1, so that the concentrated water produced by the filter device 201 can be recycled back to the water treatment device 1 and mixed and diluted with the cold water flowing into the water chamber 115 from the cold water supply pipe 3 in the water chamber 115 of the water treatment device 1. The mixed and diluted water can also be polarized by the polarization component 121 and transformed into an ionic state that is not easy to precipitate, and then flow back to the filter device 201 or the water heater 100, avoiding the waste caused by the direct discharge of the concentrated water produced by the filter device 201, saving water resources and reducing costs.

[0102] In one embodiment, the filter element of the filter device 201 is a composite reverse osmosis filter element, which has good filtration effect and high filtration efficiency. The filter device 201 with the composite filter element is an existing mature product, and its structure is not limited in this embodiment. In this embodiment, the filter element of the filter device 201 can also be other existing types of filter structures.

[0103] In one embodiment, the water treatment device 1 includes two inlets 1121 and two outlets 1131. The two inlets 1121 are a first inlet 1121a and a second inlet 1121b, respectively. The two outlets 1131 are a first outlet 1131a and a second outlet 1131b, respectively. The outlet end of the cold water supply pipe 3 is connected to the first inlet 1121a, the outlet end of the concentrate pipe 205 is connected to the second inlet 1121b, the inlet end of the cold water inlet pipe 4 is connected to the first outlet 1131a, and the inlet end of the filter inlet pipe 202 is connected to the second outlet 1131b. This configuration allows for the separation of the inlet water from the concentrated water pipe 205 to the water treatment device 1 from the inlet water from the cold water supply pipe 3 to the water treatment device 1, effectively preventing the concentrated water discharged from the concentrated water pipe 205 from flowing to the cold water supply pipe 3. It also allows for the separate assembly and disassembly of the water treatment device 1 from the cold water supply pipe 3 and the concentrated water pipe 205. By setting the first outlet 1131a and the second outlet 1131b, it is convenient to achieve separate connection between the cold water inlet pipe 4 and the filter inlet pipe 202 and the water treatment device 1, thereby improving ease of use.

[0104] In another embodiment, only one inlet 1121 may be provided, that is, the outlet end of the concentrate pipe 205, the water treatment device 1, and the cold water supply pipe 3 are connected by a T-joint. In another embodiment, only one outlet 1131 may be provided, that is, the outlet 1131 of the water treatment device 1, the inlet end of the cold water inlet pipe 4, and the inlet end of the filter inlet pipe 202 are connected by a T-joint.

[0105] In one embodiment, a drain control valve 206 is provided on the concentrate pipe 205. The drain control valve 206 is used to control the opening and closing of the concentrate pipe 205, thereby facilitating the maintenance of the water purification module 200 and the water heater 100. The concentrate pipe 205 and the water inlet pipe 112 of the water treatment device 1 can be connected by, but are not limited to, a detachable and sealed connection method such as a threaded connection or an interference fit, to improve the convenience of disassembly, assembly, and maintenance of the drinking water and hot water equipment.

[0106] Furthermore, a booster pump 204 and an inlet control valve 203 are installed on the filter inlet pipe 202. The booster pump 204 is used to increase the water pressure flowing to the filter device 201, thereby increasing the pressure of the water flow impacting the filter membrane and improving the permeation filtration effect. The inlet control valve 203 is used to control the opening and closing of the filter inlet pipe 202, thereby controlling the water intake and filtration of the filter device 201. Both the inlet control valve 203 and the booster pump 204 are communicatively connected to the controller.

[0107] In one embodiment, the purified drinking water supply terminal includes a hot water purified drinking water terminal 230 and a room temperature purified drinking water terminal 220. The pure water pipe 207 includes a pure water main pipe 2071, a first branch pipe 2072, and a second branch pipe 2073. The inlet of the pure water main pipe 2071 is connected to the pure water outlet of the filter device 201. The first branch pipe 2072 is connected between the pure water main pipe 2071 and the room temperature purified drinking water terminal 220. The water purification module 200 also includes a connecting pipe 210 and a heating component 219 disposed on the connecting pipe 210. The second branch pipe 2073 is connected between the connecting pipe 210 and the outlet of the pure water main pipe 2071. The connecting pipe 210 is connected between the hot water purified drinking water terminal 230 and the outlet of the second branch pipe 2073. The heating component 219 is used to heat the water flowing through it. The above configuration can meet the needs of room temperature drinking water and hot drinking water, and improve the user experience of the purified drinking water and hot water equipment.

[0108] In one embodiment, the water purification module 200 further includes a water distributor 211, which has a first inlet, a second inlet, a first outlet, and a second outlet. The water distributor 211 also has a first channel connecting the first outlet and the first inlet, a second channel connecting the second inlet and the second outlet, and a third channel connecting the second inlet and the first outlet. The first channel is connected in series to the filter inlet pipe 202, and the second channel is connected in series between the second branch pipe 2073 and the connecting pipe 210. The third channel is equipped with a diversion check valve that only allows water to flow from the second inlet to the first outlet.

[0109] By setting up the water distributor 211, the first channel, the filter inlet pipe 202, the filter device 201, the pure water main pipe 2071, the second branch pipe 2073, and the third channel can be connected in sequence to form a filter circulation pipeline. When the hot water purification terminal 230 is opened, the pure water produced by the filter device 201 flows to the water distributor 211 through the pure water main pipe 2071 and the second branch pipe 2073. Then, part of the pure water flows to the hot water purification terminal 230 through the second outlet, and the other part of the pure water flows back to the filter device 201 through the third channel and the filter inlet pipe 202 for further filtration. Thus, by setting up the water distributor 211, the water pressure and flow rate flowing to the hot water purification terminal 230 can be changed, so that the water flow rate and pressure flowing through the heating component 219 meet the power requirements of the heating component 219, avoiding water pressure fluctuations at the hot water purification terminal 230 and improving the water output stability of the hot water purification terminal 230.

[0110] Furthermore, a pure water check valve 208 is installed on the pure water main pipe 2071. The pure water check valve 208 only allows water to flow from the pure water outlet to the outlet end of the pure water main pipe 2071. The pure water check valve 208 is installed to prevent pure water from flowing back into the filter device 201. Furthermore, a pressure switch 209 is also installed on the pure water pipe 207, and the pressure switch 209 is located downstream of the pure water check valve 208.

[0111] An auxiliary water pump 214 is installed on the connecting pipe 210. The auxiliary water pump 214 is connected to the controller. The auxiliary water pump 214 can avoid the problem of insufficient water supply pressure caused by the excessively long pipeline between the pure water outlet and the hot water purification drinking water end 230, and ensure the water supply pressure of the hot water purification drinking water end 230.

[0112] Furthermore, a heating control valve 212 is also installed on the connecting pipe 210. The heating control valve 212 is used to control the opening and closing of the connecting pipe 210, which helps to ensure that hot water does not flow out of the hot water drinking end 230 and cause scalding to the user. A zero-pressure valve 213 is also installed on the connecting pipe 210 to ensure that the downstream water circuit is in a pressureless state when the connecting pipe 210 supplies water, and the water flow rate and outlet water temperature are better controlled. The zero-pressure valve 213 is located between the heating control valve 212 and the auxiliary water pump 214.

[0113] A flow meter 215 is also installed on the connecting pipe 210 to detect the flow rate in the connecting pipe 210, thereby better regulating the heating power of the heating component 219 and ensuring that the outlet water temperature of the hot water purifier 230 meets the requirements, avoiding overheating or underheating of the water at the hot water purifier 230. A water temperature sensor is also installed on the connecting pipe 210 to detect the temperature of the water flowing to the heating component 219, thereby regulating the heating efficiency of the heating component 219. Both the water temperature sensor and the water flow meter are communicatively connected to the controller.

[0114] A water outlet thermometer 217 is also installed on the connecting pipe 210. The water outlet thermometer 217 is located downstream of the heating component 219 to detect the temperature of the water heated by the heating component 219, thereby determining whether the temperature of the water flowing out of the heating component 219 meets the target temperature requirement. The water outlet thermometer 217 is communicatively connected to the controller.

[0115] The heating component 219 includes an electric heating element, and the connecting pipe 210 can be set using an existing structure. The capacity and heating power of the connecting pipe 210 can be set according to requirements, and this embodiment does not impose any restrictions on this.

[0116] Furthermore, a water vapor separator 218 is also provided on the connecting pipe 210. The water vapor separator 218 is located downstream of the heating component 219. The water vapor separator 218 has a water vapor inlet, a liquid outlet, and a gas outlet. The water vapor inlet is connected to the water outlet of the heating component 219, the liquid outlet is connected to the hot water supply end, and the gas outlet is connected to the external environment. Thus, gas-liquid separation is achieved through the water vapor separator 218, preventing water vapor from flowing out through the hot water supply end and scalding the user, thereby improving the safety and reliability of the water purification module 200 and the hot water purification equipment.

[0117] In the specific implementation of the above embodiments, the technical features can be combined in any non-contradictory way. For the sake of brevity, not all possible combinations of the above technical features are described. However, as long as the combination of these technical features is not contradictory, it should be considered to be within the scope of this specification.

[0118] The specific embodiments described above are merely illustrative of several implementations of the present invention, and while the descriptions are detailed, they should not be construed as limiting the scope of the present invention. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these modifications and improvements all fall within the scope of protection of the present invention. Therefore, the scope of protection of this patent should be determined by the appended claims.

Claims

1. A water treatment device, characterized in that, The device includes a housing (11) and a polarizing element (12). The housing (11) has a water-containing cavity (115), a water inlet (1121), and a water outlet (1131). The water inlet (1121) and the water outlet (1131) are both connected to the water-containing cavity (115). The polarizing element (12) is located inside the water-containing cavity (115) and multiple polarizing elements are arranged sequentially and at intervals along the water inlet (1121) to the water outlet (1131). The polarizing element (12) includes a plurality of polarizing components (121) arranged opposite to each other and spaced apart. Each polarizing component (121) has an inclined angle relative to the flow surface where the polarizing element (12) is located, and the inclined angles corresponding to two adjacent polarizing components (12) are different; or, the polarizing element (12) includes a plurality of polarizing components (121) arranged spaced apart around a preset axis, from the inlet (1121) to the outlet (1131). Each polarizing component (121) is inclined in a clockwise or counterclockwise direction, and in two adjacent polarizing elements (12), the polarizing component (121) of one polarizing element (12) is inclined in a clockwise direction, and the polarizing component (121) of the other polarizing element (12) is inclined in a counterclockwise direction.

2. The water treatment device according to claim 1, characterized in that, All the tilt angles of the same polarizing element (12) have the same opening orientation and size, while the tilt angles of different polarizing elements (12) have opposite opening orientations; And / or, the angle of inclination is 25° to 60°.

3. The water treatment apparatus according to claim 1, characterized in that, The water-containing cavity (115) has a circular cross-section, and the preset axis passes perpendicularly through the circular cross-section where the polarizing element (12) is located; And / or, the angle between the polarization component (121) and the flow plane perpendicular to the preset axis is 25° to 60°.

4. The water treatment apparatus according to claim 3, characterized in that, The polarization component (121) has a preset angle with the flow plane perpendicular to the preset axis. In the same polarization component (12), the preset angle of all polarization components (121) is the same. And / or, the polarizing element (12) includes a coaxially arranged central disk portion (122) and a mounting ring portion (123), the polarizing component (121) is connected between the central disk portion (122) and the mounting ring portion (123) and is arranged in a plurality of them at circumferential intervals along the central disk portion (122), and the mounting ring portion (123) is mounted on the inner wall of the housing (11).

5. The water treatment apparatus according to any one of claims 1-4, characterized in that, The housing (11) extends along a first direction, and the inlet (1121) and the outlet (1131) are located at opposite ends of the housing (11) along the first direction, respectively. The flow surface is perpendicular to the first direction; or, the preset axis is set along the first direction.

6. The water treatment apparatus according to claim 5, characterized in that, In a projection plane perpendicular to the first direction, the polarization components (121) of two adjacent polarization components (12) are staggered.

7. The water treatment apparatus according to any one of claims 1-4, characterized in that, The water-containing cavity (115) has a mounting groove (116) on its cavity wall. The mounting groove (116) is provided in a one-to-one correspondence with the polarizing element (12). The periphery of the polarizing element (12) is inserted into the mounting groove (116).

8. A water heater, comprising a heating body (2) and a cold water inlet pipe (4) connected to the water inlet end of the heating body (2), characterized in that, The water treatment device includes any one of claims 1-7, wherein the water inlet end of the heating body (2) and the water outlet (1131) are connected by a cold water inlet pipe (4), and the water inlet (1121) is connected to a cold water supply pipe (3), which is used to connect to the cold water supply end (300).

9. A water purification and hot water equipment, characterized in that, include: The water treatment apparatus according to any one of claims 1-7, wherein the inlet (1121) is connected to a cold water supply pipe (3); The heating body (2) is connected to the water inlet and the water outlet (1131) by a cold water inlet pipe (4); The water purification module (200) includes a filter device (201), a filter inlet pipe (202), and a concentrate pipe (205). The inlet end of the filter inlet pipe (202) is connected to the outlet (1131), and the outlet end of the filter inlet pipe (202) is connected to the raw water inlet of the filter device (201). The concentrate pipe (205) is connected between the concentrate outlet of the filter device (201) and the inlet (1121). The pure water outlet of the filter device (201) is connected to a pure water pipe (207), which is used to supply filtered pure water to the drinking water end.

10. The purified drinking water and hot water equipment according to claim 9, characterized in that, The housing (11) includes two water inlets (1121), which are a first water inlet (1121a) and a second water inlet (1121b), respectively. The first water inlet (1121a) is connected to the outlet of the cold water supply pipe (3), and the second water inlet (1121b) is connected to the outlet of the concentrate pipe (205). And / or, the housing (11) includes two water outlets (1131), the two water outlets (1131) being a first water outlet (1131a) and a second water outlet (1131b), the first water outlet (1131a) being connected to the inlet end of the cold water inlet pipe (4), and the second water outlet being connected to the inlet end of the filter inlet pipe (202).

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