A center tube for a RO cartridge

Abstract

The application relates to the technical field of water purification equipment, and discloses a center pipe for an RO filter core, the pipe wall of the center pipe is provided with at least one row of water inlet holes, each row of water inlet holes is composed of a plurality of water inlet holes arranged along the axial direction of the center pipe, the outer surface of the pipe wall of the center pipe is provided with a water guide groove, in the axial direction of the center pipe, two adjacent water inlet holes are provided with the water guide groove, the two ends of the water guide groove are communicated with the water inlet holes, and the width of the middle part of the water guide groove is smaller than that of the end part. The width of the middle part of the water guide groove is smaller than that of the end part, an unbalanced Laplace pressure difference is formed on the surface of the water guide groove, the surface energy of a liquid drop is increased during the process of flowing to the water inlet, the liquid drop forms a driving force from the narrow part to the wide part under the action of the difference, the water guide effect of the water guide groove is improved, pure water is more easily flowed from the middle part of the water guide groove to the two ends, and then enters the center pipe through the water inlet holes, the pure water flow and the conveying efficiency are improved, and large flux of the water purifier is realized.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of water purification equipment, and particularly relates to a center tube for a RO filter core. BACKGROUND

[0002] The center tube is a basic component in the RO filter core and has the function of guiding the permeated pure water to flow out of the RO filter core. However, the unreasonable structure of the center tube in the RO filter core will affect the water production flow of the water purifier to some extent, which is not conducive to realizing large flux of the water purifier.

[0003] For example, the Chinese patent with the announcement number CN207091063U discloses a center tube, a RO membrane filter core and a water purifier, the center tube is provided with a water guide groove recessed on the outer surface of the tube wall of the center tube, and the water guide groove is in communication with the pure water hole, so as to increase the water inlet area of the pure water hole on the center tube. For another example, the Chinese patent with the announcement number CN209714778U discloses a center tube of a RO membrane filter core, longitudinal and horizontal interlaced grooves are arranged on the outer wall of the center tube, and a water guide groove is also arranged on the outer wall of the center tube, each groove is in communication with the water guide groove, and the water guide groove passes through each tube hole and is in communication with the tube hole, the water filtered by the RO membrane is collected through the grooves and the water guide groove and then enters the hollow of the center tube through the tube hole, and the water guide effect is improved. In the above two patents, the grooves are added to the periphery of the center tube to increase the pure water quantity through the pure water hole of the RO filter core. However, the water guide groove is an equal-width water guide groove, and the center tube with the added water guide groove increases the water inlet flow of the pure water hole on the center tube to some extent, but the equal-width water guide groove only limits the direction of the water flow to the center tube and cannot provide a driving force for effectively guiding the water flow to flow into the center tube, which affects the flow and conveying efficiency of the pure water, and therefore the structure of the center tube still has room for improvement. SUMMARY

[0004] The present application aims to provide a center tube for a RO filter core to solve the problem of small pure water flow of the existing center tube.

[0005] To achieve the above-mentioned purpose, the present application provides a center tube for a RO filter core, the tube wall of the center tube is provided with at least one row of water inlet holes, each row of water inlet holes is composed of a plurality of water inlet holes arranged along the axial direction of the center tube, the outer surface of the tube wall of the center tube is provided with a water guide groove, in the axial direction of the center tube, the water guide groove is arranged between two adjacent water inlet holes, the two ends of the water guide groove are in communication with the water inlet holes, and the width of the middle part of the water guide groove is smaller than the width of the end part.

[0006] The application provides a center tube for an RO filter element, in the axial direction of the center tube, two adjacent water inlet holes are provided with a water guide groove, the two ends of the water guide groove are communicated with the water inlet holes, and the water guide groove plays a role in collecting and guiding water flow along the axial direction of the center tube, so that the pure water permeated in the region between the two water inlet holes is beneficial to flow to the water inlet hole, the water flow is further improved, the width of the middle part of the water guide groove is smaller than the width of the end part, the radius of the liquid droplet is smaller in the narrower middle part, and a larger Laplace pressure difference is caused; in the wider two ends, the radius of the liquid droplet is larger, and a smaller Laplace pressure difference is caused, so that an unbalanced Laplace pressure difference is formed on the surface of the water guide groove, meanwhile, the surface energy of the liquid droplet increases in the process of flowing to the water inlet, and the liquid droplet forms a driving force from the narrow part to the wide part under the action of the difference, so that the water guide effect of the water guide groove is improved, the pure water purified by the RO filter element can flow more easily from the middle part of the water guide groove to the two ends, and then enters the center tube through the water inlet hole, the pure water flow and the conveying efficiency are improved, and large flux of the water purifier is realized.

[0007] Preferably, the center of the water inlet hole is located on the central axis of the water guide groove.

[0008] The center of the water inlet hole is located on the central axis of the water guide groove, so that the pure water collected by the water guide groove flows more directly and easily to the water inlet hole, the flow resistance is small, and the pure water flow and the conveying efficiency are further improved.

[0009] Preferably, the outer surface of the pipe wall of the center tube is provided with an annular groove extending in the circumferential direction, and the annular groove is communicated with the middle part of the water guide groove.

[0010] The annular groove extends in the circumferential direction to achieve the effect of guiding the pure water in the circumferential direction, the pure water permeated in the region between the multiple rows of water inlet holes can be drained to the middle part of the water guide groove, and then flows to the water inlet hole, so that the drainage effect is realized more comprehensively, and the flux of the entire RO filter element is increased.

[0011] Preferably, the pipe wall of the center tube is provided with multiple rows of water inlet holes in parallel, the water inlet holes of the adjacent two rows are arranged in alignment, and the water guide grooves of the adjacent two rows are communicated through the annular groove.

[0012] By arranging multiple rows of water inlet holes in parallel, the multiple rows of water inlet holes allow the pure water in multiple circumferential regions of the center tube to flow into the center tube through the water inlet holes more quickly, the water inlet holes of the adjacent two rows are arranged in alignment, the water guide grooves of the adjacent two rows are communicated through the annular groove, so that the pure water collected through the same annular groove can flow into the adjacent water inlet hole in a shorter path, the flow is more orderly, and the formation of turbulence of the pure water in the process of flowing to different water inlet holes is avoided, the pure water flow and the conveying efficiency are improved.

[0013] Preferably, a drainage groove is arranged between the water inlet holes of the adjacent two rows, the two ends of the drainage groove are communicated with the annular groove, and the width of the drainage groove gradually increases from the middle part of the drainage groove to the two ends.

[0014] The drainage groove is arranged between the two adjacent rows of water inlet holes, and can collect more and more comprehensive pure water. The two ends of the drainage groove are respectively communicated with the annular groove. The width of the drainage groove gradually increases from the middle part to the two ends. Therefore, the liquid droplets in the drainage groove between the two adjacent rows of water inlet holes are subjected to unbalanced Laplace pressure difference. The liquid droplets are driven from the narrow part to the wide part of the drainage groove under the action of the difference, that is, the liquid flows from the middle part to the two ends of the drainage groove, is guided through the annular groove, and then flows into the water guide groove. The pure water collected at the water guide groove flows into the center pipe through the water inlet hole, thereby improving the pure water flow and the conveying efficiency, and realizing large flux of the water purifier.

[0015] Preferably, the groove depth H1 of the drainage groove, the groove depth H2 of the annular groove, and the groove depth H3 of the water guide groove satisfy H1

[0016] The above relationship is satisfied. When the pure water permeated by the RO membrane contacts the outer surface of the center pipe, the pure water first contacts the drainage groove, and then moves from the narrow part to the wide part of the drainage groove under the action of the Laplace pressure difference. Then, the pure water enters the deeper annular groove, is combined with the pure water permeated at this position, and finally enters the deeper water guide groove and is combined with the pure water permeated at this position and enters the water inlet hole. Therefore, the flow of the pure water is more orderly, the balance of the water outlet of the center pipe is better, and due to the depth difference of the three and the setting of the Laplace pressure difference of the liquid droplets, the liquid is not easy to backflow, thereby further increasing the flow of the pure water flowing into the center pipe hole, and thereby increasing the flux of the entire RO filter core.

[0017] Preferably, the groove side wall of the drainage groove extends outwardly and obliquely from the bottom to the top.

[0018] The groove side wall of the drainage groove extends outwardly and obliquely from the bottom to the top, thereby forming a “corner flow” effect, so that the pure water has a tendency to flow in the direction of the two ends, and the ability of the drainage groove to collect and guide the pure water is strengthened, which is beneficial to collect the pure water in all directions and increase the pure water flow.

[0019] Preferably, the width of the annular groove gradually increases towards the water guide groove.

[0020] The width of the annular groove gradually increases towards the water guide groove, thereby having the effect of guiding the pure water to the water guide groove, and can compensate for the flow loss caused by the pure water unable to enter the center pipe through the two rows of water inlet holes to a certain extent. The width change of the annular groove plays a guiding effect, which can reduce the number of rows of water inlet holes, thereby facilitating the manufacturing of the center pipe, reducing the mold processing cost, and facilitating production.

[0021] Preferably, the pipe wall of the center pipe is provided with multiple rows of water inlet holes in parallel, and the water inlet holes of the opposite two rows are arranged in a staggered manner.

[0022] The two rows of water inlet holes are staggered, so that the flow resistance caused by the mutual collision of the water flows passing through the two rows of water inlet holes can be avoided to the greatest extent, the pure water is further stably flowed, the flow rate of the pure water is improved, and the flow is increased.

[0023] In the circumferential direction of the center pipe, a water guide groove is arranged between the two adjacent water inlet holes, and the two ends of the water guide groove are communicated with the water inlet holes, so as to collect and guide the water flow along the circumferential direction of the center pipe, facilitate the pure water permeated in the region between the two water inlet holes to flow to the water inlet holes, further improve the water flow, and the width of the water guide groove gradually increases from the middle part to the two ends. In the narrower middle part, the radius of the droplet is smaller, which will cause a larger Laplace pressure difference; in the wider two ends, the radius of the droplet is larger, which will cause a smaller Laplace pressure difference, so that an unbalanced Laplace pressure difference is formed on the surface of the water guide groove. At the same time, there is an increase in surface energy along the widening direction, and the droplet forms a driving force from the narrow part to the wide part under the action of the difference, so that the water guide effect of the water guide groove is improved, the pure water purified by the RO filter element can flow more easily from the middle part to the two ends of the water guide groove, and then enter the center pipe through the water inlet hole, so that the pure water flow and the conveying efficiency are improved, and the large flux of the water purifier is realized. BRIEF DESCRIPTION OF DRAWINGS

[0024] The accompanying drawings, which are included to provide a further understanding of the application, form a part of the application and, along with the description, serve to explain the application. The illustrative embodiments of the application and their description serve to explain the application without unduly limiting the same. In the drawings:

[0025] Figure 1 It is a complete structure schematic diagram of the center pipe in an embodiment of the application.

[0026] Figure 2 It is a structure schematic diagram of the center pipe in an embodiment of the application. Figure 1 It is an enlarged structure schematic diagram of the A part.

[0027] Figure 3 It is a structure schematic diagram of the center pipe in an embodiment of the application.

[0028] Figure 4 It is a partial structure schematic diagram of the center pipe in an embodiment of the application.

[0029] Figure 5 It is a cross-sectional structure schematic diagram of the center pipe in an embodiment of the application.

[0030] Figure 6 It is a partial structure schematic diagram of the center pipe in another embodiment of the application.

[0031] Figure 7 This is a schematic diagram of the complete structure of the central tube in another embodiment of the present invention.

[0032] Figure 8 This is a partial structural diagram of the central tube in another embodiment of the present invention.

[0033] Explanation of reference numerals in the attached figures:

[0034] 10-Central pipe; 11-Water inlet; 12-Water guide channel; 13-Annular channel; 14-Drainage channel. Detailed Implementation

[0035] To more clearly illustrate the overall concept of the present invention, a detailed description will be provided below with reference to the accompanying drawings and examples.

[0036] It should be noted that many specific details are set forth in the following description in order to provide a full understanding of the present invention. However, the present invention may also be implemented in other ways different from those described herein. Therefore, the scope of protection of the present invention is not limited to the specific embodiments disclosed below.

[0037] like Figure 1 As shown, in one embodiment of the present invention, a central tube for an RO filter element is provided. The central tube 10 has at least one row of water inlet holes 11 on its wall. Each row of water inlet holes 11 is composed of multiple water inlet holes arranged along the axial direction of the central tube 10. A water guide groove 12 is provided on the outer surface of the wall of the central tube 10. In the axial direction of the central tube, a water guide groove 12 is provided between two adjacent water inlet holes 11. The two ends of the water guide groove 12 are respectively connected to the water inlet holes 11. The width of the middle part of the water guide groove 12 is smaller than the width of the end part. For specific examples, the width of the water guide channel 12 gradually increases from the middle to both ends; or, the width of the middle part of the water guide channel 12 is constant, and the width of the ends is also constant, with the width of the middle part being smaller than the width of the ends. Preferably, the middle and ends of the water guide channel 12 are smoothly connected to improve the flow guiding effect of the water guide channel 12; or, the width of the middle part of the water guide channel 12 is constant, and the width of the ends gradually increases from the middle towards the water inlet, with the width of the middle region being smaller than the minimum width of the ends. Preferably, the middle and ends of the water guide channel 12 are smoothly connected to improve the flow guiding effect of the water guide channel 12. It is understood that there are many other combinations as well. In a preferred embodiment, such as... Figure 1 As shown, the width of the water guide channel 12 gradually increases from the middle to both ends.

[0038] This invention provides a central tube 10 for an RO filter cartridge. Along the axial direction of the central tube 10, a water guide groove 12 is provided between two adjacent water inlets 11. The two ends of the water guide groove 12 are connected to the water inlets 11, serving to collect and guide water flow along the axial direction of the central tube 10. This facilitates the flow of pure water permeating the area between the two water inlets 11 back to the water inlets 11, further increasing the water flow rate. The width of the water guide groove 12 gradually increases from the middle to both ends. According to the Laplace pressure difference calculation formula: ΔP = 2γ / r, where γ represents surface tension, which is fixed for the same liquid, and r represents the radius of the droplet. In the narrower middle section, the droplet radius is smaller, resulting in a larger Laplace pressure difference; at the wider ends, the droplet radius is larger, resulting in a smaller Laplace pressure difference. This creates an unbalanced Laplace pressure difference on the surface of the water guide trough 12. Simultaneously, there is an increase in surface energy along the widening direction. Under the influence of this difference, the droplets generate a driving force from the narrow to the wide section, thus improving the flow guiding effect of the water guide trough 12. This allows the purified water, after being filtered by the RO filter, to flow more easily from the middle to both ends of the water guide trough 12. The purified water will then flow as... Figure 2 The water flows in the direction indicated by the arrow in the central guide tank 12, and then enters the central pipe 10 through the water inlet 11, thereby increasing the pure water flow rate and delivery efficiency, and realizing the high flow rate of the water purifier.

[0039] In a preferred embodiment, such as Figure 1 and Figure 2 As shown, the center of the water inlet 11 is located on the central axis of the water guide channel 12.

[0040] The center of the water inlet 11 is located on the central axis of the water guide channel 12. Therefore, the pure water collected through the water guide channel 12 flows more directly and more easily into the water inlet 11, with low flow resistance, thereby further improving the pure water flow rate and delivery efficiency.

[0041] In a preferred embodiment, such as Figure 1 and Figure 2 As shown, the outer surface of the central pipe 10 is provided with an annular groove 13 extending circumferentially, and the annular groove 13 is connected to the middle part of the water guide groove 12.

[0042] The annular groove 13 extends circumferentially to guide pure water circumferentially. It can divert the pure water that permeates between the multiple rows of water inlet holes 11 to the middle of the water guide groove 12, and then flow to the water inlet holes 11, so as to achieve a more comprehensive diversion effect and increase the flow rate of the entire RO filter element.

[0043] In a preferred embodiment, such as Figure 3 As shown, the central tube 10 has multiple rows of water inlet holes 11 arranged in parallel on its tube wall. The water inlet holes 11 in adjacent rows are aligned, and the water guide channels 12 in adjacent rows are connected by annular channels 13.

[0044] Combining Figure 2 and Figure 3 , by arranging multiple rows of water inlet holes 11 in parallel, the multiple rows of water inlet holes 11 allow pure water in the circumferential multiple areas of the central pipe 10 to pass into the central pipe 10 through the water inlet holes 11 more quickly, the water inlet holes 11 of adjacent two rows are arranged in alignment, and the water guide grooves 12 of adjacent two rows are communicated through the annular grooves, so that the pure water collected through the same annular groove can flow into the adjacent water inlet holes 11 in a shorter path, the flow is more orderly, and the formation of turbulence of the pure water in the process of flowing to different water inlet holes 11 is avoided, the pure water flow and the conveying efficiency are improved.

[0045] In a preferred embodiment, as shown in Figures 1-4 , a drainage groove 14 is arranged between the water inlet holes 11 of adjacent two rows, and the two ends of the drainage groove 14 are respectively communicated with the annular grooves 13, and the width of the drainage groove 14 gradually increases from the middle part to the two ends.

[0046] The drainage groove 14 is arranged between the water inlet holes 11 of adjacent two rows, and the two ends of the drainage groove 14 are respectively communicated with the annular grooves, and the width of the drainage groove 14 gradually increases from the middle part to the two ends, so that the liquid droplets in the drainage groove between the water inlet holes 11 of adjacent two rows are subjected to an unbalanced Laplace pressure difference, and the liquid droplets are driven from the narrow part to the wide part of the drainage groove under the action of the difference, that is, the liquid flows from the middle part to the two ends of the drainage groove, and then flows into the water guide groove 12 through the annular groove 13, and then flows into the central pipe 10 through the water inlet hole 11 after being combined with the pure water collected in the water guide groove 12, thereby improving the pure water flow and the conveying efficiency, and realizing large flux of the water purifier.

[0047] In a preferred embodiment, the groove depth H1 of the drainage groove 14, the groove depth H2 of the annular groove 13, and the groove depth H3 of the water guide groove 12 satisfy H1

[0048] Satisfying the above relationship, when the pure water permeated by the RO membrane contacts the outer surface of the central pipe 10, the pure water preferentially contacts the drainage groove, and then moves from the narrow part to the wide part of the drainage groove 14 under the action of the Laplace pressure difference, and then enters the deeper annular groove 13, is combined with the pure water permeated at this position, and finally enters the deeper water guide groove 12 and is combined with the pure water permeated at this position and enters the water inlet hole 11. Therefore, the flow of the pure water is more orderly, the balance of the water outlet of the central pipe 10 is better, and due to the depth difference of the three and the setting of the Laplace pressure difference of the liquid droplets, the liquid is not easy to backflow, thereby further increasing the flow of the pure water flowing into the central pipe 10, thereby increasing the flux of the entire RO filter core.

[0049] In a preferred embodiment, as shown in Figure 5 , the groove side wall of the drainage groove 14 extends outwardly and upwardly from the bottom to the top.

[0050] The groove side wall of the drainage groove 14 extends outwardly from the bottom to the top, so as to form a "corner flow" space between the bottom of the drainage groove 14 and the upper surface of the water inlet hole. The liquid droplets have a tendency to flow in the diverging direction at the intersection of the "corner flow" space, as shown by the arrows. Figure 4 The arrows show that the ability of the drainage groove 14 to collect and guide pure water is enhanced, which is beneficial to the overall collection of pure water and increases the flow of pure water.

[0051] It should be noted that, in a preferred embodiment, as shown in Figures 1-3 The annular groove is an equal-width annular groove.

[0052] Of course, the annular groove in the present application is not limited to the above-mentioned form, and in another preferred embodiment, as shown in Figure 6 The width of the annular groove 13 gradually increases towards the water guide groove 12.

[0053] Specifically, as shown in Figure 7 Along the circumference of the central pipe, the annular groove 13 has a wide part connected with the drainage groove 14 and a narrow part located in the middle of the annular groove 13.

[0054] The width of the annular groove 13 gradually increases towards the water guide groove 12, thereby having the effect of guiding the water to the water guide groove 12, which can compensate to some extent for the flow loss caused by the pure water passing between the two rows of water inlet holes 11 and not entering the central pipe 10. The change in the width of the annular groove plays a guiding effect, which can reduce the number of rows of water inlet holes 11, thereby facilitating the manufacturing of the central pipe 10, reducing the mold processing cost, and facilitating production.

[0055] In the present application, in the circumferential direction of the central pipe 10, the two adjacent rows of water inlet holes 11 can be connected by the annular groove 13, or other ways, for example, in a preferred embodiment, the pipe wall of the central pipe 10 is provided with multiple rows of water inlet holes 11, and the water inlet holes 11 of the opposite two rows are arranged in a staggered manner. Further, in the circumferential direction of the central pipe 10, the two adjacent rows of water inlet holes 11 are provided with a water guide groove 12, the two ends of the water guide groove 12 are respectively connected with the water inlet holes 11, and the width of the water guide groove 12 gradually increases from the middle to the two ends.

[0056] The two rows of water inlet holes 11 are arranged in a staggered manner, so that the flow resistance caused by the mutual collision of the water flows passing through the two rows of water inlet holes 11 can be avoided to the greatest extent, and the pure water is further stably flowed, the flow rate of the pure water is improved, and the flow is increased. In the circumferential direction of the center pipe 10, a water guide groove 12 is arranged between two adjacent water inlet holes 11, and the two ends of the water guide groove 12 are communicated with the water inlet holes 11, respectively, so as to collect and guide the water flow along the circumferential direction of the center pipe 10, which is beneficial to the pure water permeated in the region between the two water inlet holes 11 to flow to the water inlet hole 11, further improves the water flow, and the width of the water guide groove 12 gradually increases from the middle part to the two ends of the water guide groove 12. In the narrower middle part, the radius of the liquid droplet is smaller, which will cause a larger Laplace pressure difference; in the wider two ends, the radius of the liquid droplet is larger, which will cause a smaller Laplace pressure difference, so that an unbalanced Laplace pressure difference is formed on the surface of the water guide groove 12. At the same time, there is an increase in surface energy along the widening direction, and the liquid droplet forms a driving force from the narrow part to the wide part under the action of the difference, so that the water guide effect of the water guide groove 12 is improved, and the pure water purified by the RO filter element can more easily flow from the middle part to the two ends of the water guide groove 12, and then enter the center pipe 10 through the water inlet hole 11, so as to improve the pure water flow and the conveying efficiency, and realize the large flow of the water purifier.

[0057] The technical solutions protected by the present application are not limited to the above-mentioned embodiments. It should be pointed out that the technical solutions of any one embodiment combined with the technical solutions of one or more other embodiments are within the protection scope of the present application. Although the present application has been described in detail above with general description and specific embodiments, some modifications or improvements can be made on the basis of the present application, which is obvious to those skilled in the art. Therefore, these modifications or improvements made on the basis of not deviating from the spirit of the present application are within the scope of the present application.

Claims

1. A center tube for a RO filter cartridge, a tube wall of the center tube is provided with at least one row of water inlet holes, each row of the water inlet holes is composed of a plurality of water inlet holes arranged along an axial direction of the center tube, an outer surface of the tube wall of the center tube is provided with a water guide groove, characterized in that, In the axial direction of the central pipe, two adjacent water inlet holes are provided with a water guide groove, two ends of the water guide groove are communicated with the water inlet holes, and the width of the middle part of the water guide groove is smaller than the width of the end part.

2. A center tube for an RO cartridge according to claim 1, wherein, The center of the water inlet hole is located on the central axis of the water guide groove.

3. A center tube for an RO cartridge according to claim 1, wherein, The outer surface of the pipe wall of the central pipe is provided with an annular groove extending in the circumferential direction, and the annular groove is communicated with the middle part of the water guide groove.

4. A center tube for an RO cartridge according to claim 3, wherein, The pipe wall of the central pipe is provided with multiple rows of water inlet holes in parallel, and the water inlet holes of adjacent two rows are arranged in alignment.

5. A center tube for an RO cartridge according to claim 4, wherein, A drainage groove is arranged between the water inlet holes of adjacent two rows, and two ends of the drainage groove are communicated with the annular groove, and the width of the drainage groove gradually increases from the middle part to the two ends.

6. A center tube for an RO cartridge according to claim 5, wherein, The groove depth H1 of the drainage groove, the groove depth H2 of the annular groove and the groove depth H3 of the water guide groove satisfy H1 < H2 < H3.

7. A center tube for an RO cartridge according to claim 5 wherein, The groove side wall of the drainage groove extends outwardly and upwardly from the bottom to the top.

8. A center tube for an RO cartridge according to claim 3 wherein, The width of the annular groove gradually increases towards the water guide groove.

9. A center tube for an RO cartridge according to claim 1 wherein, The pipe wall of the central pipe is provided with multiple rows of water inlet holes in parallel, and the water inlet holes of opposite two rows are arranged in misalignment.

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