Patent Description:
Reverse osmosis membranes as semipermeable membranes capable of effectively filtering out dissolved salts, colloids, microorganisms, and organic matters has been widely used in the field of water purification devices. Existing water purification elements provided with the reverse osmosis membranes typically comprise a water tube and a reverse osmosis membrane wounding around the water tube. During filtration, raw water inflows from one end of the water tube and osmoses to the reverse osmosis membrane from the water tube to be filtered.

However, the raw water flows in the direction of the central axis of the water tube and permeate to the reverse osmosis membrane, as a result, the raw water makes contact with the reverse osmosis membrane for a short time; and concentrated water generated after the raw water is filtered is prone to causing concentration polarization on the surface of the reverse osmosis membrane, resulting in scaling on the surface of the reverse osmosis membrane. Consequentially, the water purification elements provided with the reverse osmosis membranes have a short use life.

D1(<CIT>) discloses a roll type reverse osmosis membrane assembly comprising a center water producing pipe, a water purifying membrane group and at least one water diversion guiding belt arranged in the raw water flowing channel and in a straight strip shape after unfolding, to narrow the raw water flowing channel so as to increase the water flowing rate. D2 (<CIT> Al) discloses a reverse osmosis membrane element with a waterproof adhesive tape coated between a fiow guide net and a reverse osmosis membrane of the reverse osmosis membrane element to gradually narrow the flow passage to ensure the flow rate is not deceased too much. D3 (<CIT>) discloses a spiral roll type household membrane element, wherein a separation diaphragm is used to form narrow and long flow channels so that under the condition that the produced water flow rate is not changed, the inlet water flow rate and the concentrated water are reduced, and the purpose of saving the water resource is achieved. D4(<CIT>) discloses a side-stream-type RO filter having an integrally formed flow channel to extend the time raw water remains in the RO filter, so as to improve the efficiency of water purification.

The objective of the embodiment of the present application is to provide a full-effective reverse osmosis membrane element and a water purification machine to solve the technical problem that a water purification element, provided with a reverse osmosis membrane, in the prior art has a short use life due to the surface of the reverse osmosis membrane is easily to be scaled.

The objective of the embodiment of the present application is to further provide a water purification machine to solve the technical problem that a water purification machine in the prior art has poor stability after long-term use.

The technical solution adopted by the invention to settle the above-mentioned technical issue is as follows:.

An embodiment of the present application as defined in claim <NUM> provides a full-effective reverse osmosis membrane element comprising a central tube and a reverse osmosis membrane folded in half to be wound around the central tube, a raw water flow channel being formed between front surfaces of the reverse osmosis membrane folded in half, a purified water flow channel being formed between back surfaces of the reverse osmosis membrane folded in half, wherein, two opposite edges, adjacent to the central tube, of the reverse osmosis membrane folded in half being respectively sealed by a first water division band and a second water division band, a first end of the first water division band closer to the central tube and a folded end of the reverse osmosis membrane at the central tube being spaced from each other and forming a first concentrated water-outlet, a second end of the first water division band and an end, away from the central tube, of the reverse osmosis membrane being spaced from each other and forming a second concentrated water-outlet, a first end of the second water division band and the end, away from the central tube, of the reverse osmosis membrane being spaced from each other and forming a first raw water-inlet; and a second end of the second water division band and a second end of the central tube being spaced from each other and forming a second raw water-inlet, and
the two opposite edges, adjacent to the central tube, of the reverse osmosis membrane folded in half being defined as longer sides of the reverse osmosis membrane.

Preferably, the first concentrated water-outlet, the second concentrated water-outlet, and the first raw water-inlet are communicated with the raw water flow channel.

Preferably, the second raw water-inlet is communicated with the raw water flow channel.

Preferably, a distance between the first water division band and the central tube is greater than that between the second water division band and the central tube.

Preferably, a distance between the first water division band and the end, away from the central tube, of the reverse osmosis membrane is less than that between the second water division band and the end, away from the central tube, of the reverse osmosis membrane.

Preferably, an inflow water guide net used to guide the raw water to flow is arranged in the raw water flow channel and has two opposite edges respectively connected to the first water division band and the second water division band.

Preferably, a purified water guide net used to guide the purified water to flow is arranged in the purified water flow channel.

Preferably, the reverse osmosis membrane is rectangular when unfolded, the first water division band and the second water division band respectively seal two longer sides of the reverse osmosis membrane, a short side of the reverse osmosis membrane is attached to the external wall of the central tube, and two opposite edges of the purified water guide net are respectively connected to the longer sides of the reverse osmosis membrane.

Preferably, positions of the first raw water-inlet (<NUM>) and the second raw water-inlet are exchanged.

The embodiment of the present application further provides a water purification machine comprising the above full-effective reverse osmosis membrane element.

Compared with the prior art, when the full-effective reverse osmosis membrane element provided in the embodiment of the present application filters raw water, a large amount of raw water flows into the raw water flow channel between the front surfaces of the reverse osmosis membrane via the first raw water-inlet; during flowing in the raw water flow channel, the raw water can be filtered by the reverse osmosis membrane; purified water generated after the raw water is filtered flows into the central tube via the water-inlet holes and then flows out of the central tube; and raw water which does not pass through the reverse osmosis membrane outflows via the first concentrated water-outlet. Because the second end of the first water division band and the end, away from the central tube, of the reverse osmosis membrane are spaced from each other and form the second concentrated water-outlet, concentrated water generated after the raw water is filtered outflows via the second concentrated water-outlet, thus the flow rate of the concentrated water is obviously enhanced, the raw water is accelerated to flow, and the concentrated water is prevented from being accumulated to avoid a stagnant dead space in the reverse osmosis membrane, so that scaling caused by accumulation of the concentrated water on the reverse osmosis membrane away from the central tube is relieved, and the use life of the reverse osmosis membrane is prolonged.

The water purification machine in the embodiment of the present application has the following beneficial effects: the water purification machine uses the above full-effective reverse osmosis membrane element, so that concentrated water can efficiently flow out of the full-effective reverse osmosis membrane element via double concentrated water-outlets and double raw water-inlets in the full-effective reverse osmosis membrane element, a flow "dead space" of the raw water is avoided, and the surface of the reverse osmosis membrane is not prone to scaling, thus preventing the reverse osmosis membrane from being replaced or cleaned frequently, prolonging the use life of the reverse osmosis membrane, and guaranteeing the stability of the water purification machine after long-term use.

The embodiments of the present application are expounded below and illustrated in the accompanying drawings. Wherein, the same or similar reference signs represent the same or similar elements or elements having the same or similar functions throughout. The following embodiments described with reference to <FIG> are illustrative ones, are intended to explain the present application, and should not be understood as limitations of the present application.

It should be understood that the directional or positional relations indicated by terms such as "length", "width", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "internal", and "external" are based on directional or positional relations shown in the accompanying drawings, these terms are only used to facilitate and simplify the description of the present application, and do not indicate or imply that devices or elements referred to must have specific directions or must be formed and operated in specific directions, and these terms should not to be understood as limitations of the present application.

Furthermore, terms such as "first" and "second" are only for the purpose of description, and are not used to indicate or hint relative importance or to implicitly indicate the number of the technical features indicated. Thus, the features defined by "first" and "second" may explicitly or implicitly include one or more of the features. Unless otherwise explicitly and particularly defined, "a plurality of" in the description of the present application means at least two or more.

Unless otherwise explicitly specified and defined, the terms such as "install", "fix", "connected", and "connect" should be understood broadly in the present application. For instance, "connect" can be interpreted as fixed connection, detachable connection, integral connection, mechanical connection or electrical connection and can also be interpreted as direct connection, indirect connection through a medium, or internal communication or interaction of two components. Those ordinarily skilled in the art can understand the specific meanings of these terms in the present application as the case may be.

As shown in <FIG>, an embodiment of the present application provides a full-effective reverse osmosis membrane element comprising a central tube <NUM> and a reverse osmosis membrane <NUM>, wherein a plurality of water-inlet holes <NUM> are formed in the hole-wall of the central tube <NUM> and are distributed in the length direction of the central tube <NUM>. The reverse osmosis membrane <NUM> is folded in half to wound around the central tube <NUM> and cover the water-inlet holes <NUM>. Two ends, away from the central tube <NUM>, of the reverse osmosis membrane <NUM> folded in half are attached hermetically. A raw water flow channel (not shown in the figures) is formed between front surfaces of the reverse osmosis membrane <NUM> folded in half. And two opposite edges, adjacent to the central tube <NUM>, of the reverse osmosis membrane <NUM> folded in half are respectively sealed by a first water division band <NUM> and a second water division band <NUM>. A first end of the first water division band <NUM> and a first end of the central tube <NUM> are spaced from each other and form a first concentrated water-outlet <NUM>, a second end of the first water division band <NUM> and an end, away from the central tube <NUM>, of the reverse osmosis membrane <NUM> are spaced from each other and form a second concentrated water-outlet <NUM>, and a first end of the second water division band <NUM> and the end, away from the central tube <NUM>, of the reverse osmosis membrane <NUM> are spaced from each other and form a first raw water-inlet <NUM>. The first concentrated water-outlet <NUM>, the second concentrated water-outlet <NUM>, and the first raw water-inlet <NUM> are communicated with the raw water flow channel.

When the full-effective reverse osmosis membrane element in the embodiment of the present application filters raw water, a large amount of raw water can flow into the raw water flow channel between the front surfaces of the reverse osmosis membrane via the first raw water-inlet <NUM>; during flowing in the raw water flow channel, the raw water can be filtered by the reverse osmosis membrane <NUM>; purified water generated after the raw water is filtered flows into the central tube <NUM> via the water-inlet holes <NUM> and then flows out of the central tube <NUM>; and raw water which does not pass through the reverse osmosis membrane <NUM> outflows via the first concentrated water-outlet <NUM>. Because the second end of the first water division band <NUM> and the end, away from the central tube <NUM>, of the reverse osmosis membrane <NUM> are spaced from each other and form the second concentrated water-outlet <NUM>, concentrated water generated after the raw water is filtered outflows via the second concentrated water-outlet <NUM>, thus the flow rate of the concentrated water is obviously enhanced, and the concentrated water is prevented from being accumulated to avoid a dead space in the reverse osmosis membrane <NUM>, so that scaling caused by accumulation of the concentrated water on the reverse osmosis membrane <NUM> away from the central tube <NUM> is relieved, and the use life of the reverse osmosis membrane <NUM> is prolonged. Of course, the positions of the first concentrated water-outlet <NUM> and the second concentrated water-outlet <NUM> can be exchanged as actually needed, and similarly, the flow rate of the concentrated water can be enhanced, and the concentrated water can be prevented from being accumulated to avoid the dead space in the reverse osmosis membrane <NUM>.

In this embodiment, as shown in <FIG>, an end of the second water division band <NUM> and a second end of the central tube <NUM> are spaced from each other and form a second raw water-inlet <NUM> communicated with the raw water flow channel. Particularly, because the second raw water-inlet <NUM> is formed close to the second end of the central tube <NUM>, part of raw water flows into the raw water flow channel via the second raw water-inlet <NUM> in an axial direction of the central tube <NUM>, thus the raw water is prevented from forming a dead space in the raw water flow channel, and the raw water flow channel is equivalent to being lengthened, and raw water can be supplemented in a corner, showing poor flow rate of the raw water and close to the central tube <NUM>, of the raw water flow channel to enhance the flow rate of the raw water at the corner, so that the scaling at the dead space in the raw water flow channel is obviously relieved. Accordingly, the raw water enters the raw water flow channel via the first raw water-inlet <NUM> and the second raw water-inlet <NUM> to form turbulent flows in the raw water flow channel on the whole, thus the flow rate of the raw water is increased, and the raw water is prevented from being retained on a polarization boundary layer at a contact position of the reverse osmosis membrane <NUM> and the raw water, so that the raw water at a high flow rate can effectively scour scales on the surface of the reverse osmosis membrane <NUM> to further prolong the use life of the reverse osmosis membrane <NUM>. Of course, the positions of the first raw water-inlet <NUM> and the second raw water-inlet <NUM> can be exchanged as actually needed, and similarly, the flow rate of the raw water can be enhanced, and the scaling at the dead space in the raw water flow channel can be obviously relieved.

In this embodiment, as shown in <FIG>, a purified water flow channel (not shown in the figures) is formed between back surfaces of the reverse osmosis membrane <NUM> folded in half and is communicated with the water-inlet holes <NUM>. Particularly, the purified water flow channel is formed between the back surfaces of the reverse osmosis membrane <NUM> folded in half and is communicated with the water-inlet holes <NUM>, so that the raw water can be filtered by the reverse osmosis membrane <NUM> when flowing in the raw water flow channel and then enter the purified water flow channel. The purified water flow channel is communicated with the water-inlet holes <NUM>, thus purified water can enter the central tube <NUM> via the purified water flow channel and the water-inlet holes <NUM> and then flow out of the central tube <NUM> to enter an external water supply device.

Further, as shown in <FIG>, the distance between the first water division band <NUM> and the central tube <NUM> is greater than that between the second water division band <NUM> and the central tube <NUM>, the distance between the first water division band <NUM> and the end, away from the central tube <NUM>, of the reverse osmosis membrane <NUM> is less than that between the second water division band <NUM> and the end, away from the central tube <NUM>, of the reverse osmosis membrane <NUM>. Because the distance between the first water division band <NUM> and the central tube <NUM> is greater than that between the second water division band <NUM> and the central tube <NUM>, an external hole aperture of the first concentrated water-outlet <NUM> formed after the first water division band <NUM> is wound around the central tube <NUM> is greater than that of the second raw water-inlet <NUM> formed after the second water division band <NUM> is wound around the central tube <NUM>, so that concentrated water generated after filtration is completed can smoothly flow out of the reverse osmosis membrane <NUM> element.

Further, as shown in <FIG>, waterproof adhesive tapes are used as the first water division band <NUM> and the second water division band <NUM>. Particularly, the first water division band <NUM> and the second water division band <NUM> formed by the waterproof adhesive tapes have good waterproof properties and adhesive properties, thus separating the raw water and steadily sealing the two opposite edges, adjacent to the central tube <NUM>, of the reverse osmosis membrane <NUM>.

In this embodiment, as shown in <FIG>, an inflow water guide net (not shown in the figures) used to guide the raw water to flow is arranged in the raw water flow channel and has two opposite edges respectively connected to the first water division band <NUM> and the second water division band <NUM>. Particularly, because the inflow water guide net is configured and the two opposite edges of the inflow water guide net are respectively connected to the first water division band <NUM> and the second water division band <NUM>, the raw water entering the raw water flow channel can be guided by the inflow water guide net; and because of the net structure of the inflow water guide net, the raw water can be guided by the inflow water guide net to better contact with the reverse osmosis membrane <NUM> when flowing in the raw water flow channel, so that more raw water can be filtered by the reverse osmosis membrane <NUM> to be transformed into the purified water.

In this embodiment, as shown in <FIG>, a purified water guide net (not shown in the figures) used to guide the purified water to flow is arranged in the purified water flow channel. Particularly, because the purified water guide net is configured, the purified water in the purified water flow channel can be guided by the purified water guide net to flow in the purified water flow channel more smoothly.

In this embodiment, as shown in <FIG>, the reverse osmosis membrane <NUM> is rectangular when unfolded, the first water division band <NUM> and the second water division band <NUM> respectively seal two longer sides of the reverse osmosis membrane <NUM>, one short side of the reverse osmosis membrane <NUM> is attached to the external wall of the central tube <NUM>, and two opposite edges of the purified water guide net are respectively connected to the longer sides of the reverse osmosis membrane <NUM>. Particularly, the reverse osmosis membrane <NUM> is rectangular when unfolded, and the first water division band <NUM> and the second water division band <NUM> respectively seal two longer sides of the reverse osmosis membrane <NUM>, such that, the raw water flow channel is equivalent to being lengthened as much as possible, the raw water makes contact with the reverse osmosis membrane <NUM> as much as possible when flowing in the raw water flow channel, and thus more raw water can be transformed into the purified water.

In this embodiment, the external hole perimeter of the first concentrated water-outlet <NUM> accounts for <NUM>%-<NUM>% of the length of the longer sides of the reverse osmosis membrane <NUM>. Particularly, the external hole perimeter of the first concentrated water-outlet <NUM> may account for <NUM>%, <NUM>%, <NUM>%, <NUM>%, <NUM>%, <NUM>%, <NUM>%, <NUM>%, or <NUM>% of the length of the longer sides of the reverse osmosis membrane <NUM>. The external hole perimeter of the first concentrated water-outlet <NUM> is limited to account for <NUM>%-<NUM>% of the length of the longer sides of the reverse osmosis membrane <NUM> , thus the first concentrated water-outlet <NUM> is more accurate in size, so that the concentrated water can efficiently outflow via the first concentrated water-outlet <NUM>, the first concentrated water-outlet <NUM> is limited in size to be prevented from being extremely large, which may otherwise make the raw water outflow via the first concentrated water-outlet <NUM> without being filtered sufficiently, and the transformation rate of the raw water into the purified water is guaranteed.

In this embodiment, the external hole perimeter of the second concentrated water-outlet <NUM> accounts for <NUM>%-<NUM>% of the length of the longer sides of the reverse osmosis membrane <NUM>. Particularly, the an external hole perimeter of the second concentrated water-outlet <NUM> may account for <NUM>%, <NUM>%, <NUM>%, <NUM>%, <NUM>%, <NUM>%, <NUM>%, <NUM>%, <NUM>%, <NUM>%, or <NUM>% of the length of the longer sides of the reverse osmosis membrane <NUM>. Thus the second concentrated water-outlet <NUM> serving as an auxiliary water-outlet opening is large enough, so that outflow efficiency of the concentrated water is effectively improved.

In this embodiment, the external hole perimeter of the first raw water-inlet <NUM> accounts for <NUM>%-<NUM>% of the length of the longer sides of the reverse osmosis membrane <NUM>. Particularly, the external hole perimeter of the first raw water-inlet <NUM> may account for <NUM>%, <NUM>%, <NUM>%, <NUM>%, <NUM>%, <NUM>%, <NUM>%, <NUM>%, or <NUM>% of the length of the longer sides of the reverse osmosis membrane <NUM>. The external hole perimeter of the first raw water-inlet <NUM> is limited to account for <NUM>%-<NUM>% of the length of the longer sides of the reverse osmosis membrane <NUM>, thus sufficient raw water flows into the raw water flow channel via the first raw water-inlet <NUM>, so that the flow rate of the raw water in the raw water flow channel is guaranteed.

The water purification machine in the embodiment of the present application uses the above full-effective reverse osmosis membrane element, so that concentrated water can efficiently flow out of the full-effective reverse osmosis membrane element via double concentrated water-outlets and double raw water-inlets in the full-effective reverse osmosis membrane element, a flow "dead space" of the raw water is avoided, and the surface of the reverse osmosis membrane <NUM> is not prone to scaling, thus preventing the reverse osmosis membrane <NUM> from being replaced or cleaned frequently, prolonging the use life of the reverse osmosis membrane <NUM>, and guaranteeing the stability of the water purification machine after long-term use.

In summary, the present application has the above excellent properties, thus improving the efficiency which cannot be achieved in the prior art to have practicability in use. Accordingly, the product incorporating the present application has great practical value.

Claim 1:
A full-effective reverse osmosis membrane element, comprising a central tube (<NUM>) and a reverse osmosis membrane (<NUM>) folded in half to be wound around the central tube (<NUM>), a raw water flow channel being formed between front surfaces of the reverse osmosis membrane (<NUM>) folded in half, a purified water flow channel being formed between back surfaces of the reverse osmosis membrane (<NUM>) folded in half, wherein, two opposite edges, adjacent to the central tube (<NUM>), of the reverse osmosis membrane (<NUM>) folded in half being respectively sealed by a first water division band (<NUM>) and a second water division band (<NUM>) , a first end of the first water division band (<NUM>) closer to the central tube (<NUM>) and a folded end of the reverse osmosis membrane (<NUM>) at the central tube (<NUM>) being spaced from each other and forming a first concentrated water-outlet (<NUM>), a second end of the first water division band (<NUM>) and an end, away from the central tube (<NUM>), of the reverse osmosis membrane (<NUM>) being spaced from each other and forming a second concentrated water-outlet (<NUM>), a first end of the second water division band (<NUM>) and the end, away from the central tube (<NUM>), of the reverse osmosis membrane (<NUM>) being spaced from each other and forming a first raw water-inlet (<NUM>); and a second end of the second water division band (<NUM>) and a second end of the central tube (<NUM>) being spaced from each other and forming a second raw water-inlet (<NUM>), and
the two opposite edges, adjacent to the central tube (<NUM>), of the reverse osmosis membrane (<NUM>) folded in half being defined as longer sides of the reverse osmosis membrane (<NUM>).