Reverse osmosis membrane elements and devices

Abstract

The present invention belongs to the field of reverse osmosis technology, and specifically relates to a reverse osmosis membrane element and a device. The reverse osmosis membrane element includes an element body including a central tube, and a first stress reducer and a second stress reducer respectively connected to the water production end and the water inlet end of the element body. A first annular flange is formed on the end face of the first stress reducer and on the periphery of the port of the central tube. A first sealing ring is provided on the outer peripheral surface of the first annular flange. A first annular countersunk hole is formed on the end face of the second stress reducer and on the periphery of the port of the central tube. When two reverse osmosis membrane elements are connected, the first annular flange can be inserted into the first annular countersunk hole, and a sealing fit is established with the help of the first sealing ring, so as to achieve the purpose of guiding the central tube ports on the two reverse osmosis membrane elements to align and connect. The present invention can avoid the use of a central tube connector in the alignment and connection operation of the reverse osmosis membrane element, and can achieve the purpose of reducing the water production resistance and increasing the water production per unit time.

Description

Technical Field

[0001] The invention relates to the technical field of reverse osmosis, and in particular to a reverse osmosis membrane element and a device. Background Art

[0002] When using industrial reverse osmosis membranes (or reverse osmosis membrane elements), multiple reverse osmosis membranes are usually connected together and installed in the membrane shell. In practical applications, the number of reverse osmosis membranes to be connected will be 2 to 10 depending on the application scenario, and more can be connected in special cases. When installing the reverse osmosis membrane, first confirm the water inlet direction of the membrane shell to ensure that the water inlet direction of the first reverse osmosis membrane is consistent with the water inlet direction of the membrane shell. Before the first reverse osmosis membrane is completely installed in the membrane shell, it is necessary to configure a central tube connector at the exposed end of the first reverse osmosis membrane so that the central tube connector is connected / plugged with the central tube of the first reverse osmosis membrane. Then, after confirming that the water inlet direction of the second reverse osmosis membrane is the same as the water inlet direction of the membrane shell, the water outlet end of the second reverse osmosis membrane is connected to the central tube connector configured on the first reverse osmosis membrane through the central tube, and a connection relationship is established between the water outlet end of the second reverse osmosis membrane and the water inlet end of the first reverse osmosis membrane. Then install the second reverse osmosis membrane into the membrane shell. Similarly, before the second reverse osmosis membrane is completely installed into the membrane shell, a central tube connector is configured at its exposed end to connect with the third reverse osmosis membrane, and so on, until a suitable number of reverse osmosis membranes are installed in the membrane shell.

[0003] By placing the existing central tube connector between two adjacent reverse osmosis membranes and establishing a connection between the central tubes of the two adjacent reverse osmosis membranes, because the inner diameter of the central tube connector used is significantly smaller than the inner diameter of the central tube, pressure buildup will occur at the connection position, forming a higher water production resistance, resulting in a decrease in water production. Moreover, the more reverse osmosis membranes are installed in the membrane shell, the greater the water production resistance caused by the accumulation of pressure buildup, and the more significant the simulation of water production efficiency will be. When the reverse osmosis membrane is installed in the membrane shell, stress relievers are also set at both ends of the reverse osmosis membrane, and the central tube connector is generally set in the stress reliever. Summary of the invention

[0004] The present invention provides a reverse osmosis membrane element and device. When the reverse osmosis membrane element is arranged between two adjacent reverse osmosis membranes, the central tube connector can be omitted in the alignment connection structure of the reverse osmosis membrane, thereby eliminating the water production resistance problem caused by the central tube connector having a smaller diameter than the central tube. Therefore, compared with the prior art, the present invention can achieve the purpose of reducing the water production resistance and increasing the water production per unit time.

[0005] The technical solution adopted by the present invention to solve its technical problem is: a reverse osmosis membrane element, including an element body including a central tube, and a first stress resistor and a second stress resistor respectively connected to the water production end and the water inlet end of the element body.

[0006] A first annular flange extending in the axial direction is formed on the end surface of the first stress resistor and on the periphery of the port of the central tube. A first sealing ring is provided on the outer peripheral surface of the first annular flange. A first annular counterbore extending in the axial direction is formed on the end surface of the second stress resistor and on the periphery of the port of the central tube.

[0007] When two reverse osmosis membrane elements are connected, the first annular flange is inserted into the first annular counterbore, and a sealing fit can be established between the relative circumferential surfaces / contacting circumferential surfaces of the two elements with the help of the first sealing ring, thereby finally achieving the purpose of guiding the central tube ports on the two reverse osmosis membrane elements to align and connect.

[0008] Optionally, the end of one central tube extends to the inner port of the first annular flange, and at the same time, the end of another central tube aligned and connected thereto extends into the first annular counterbore.

[0009] A first annular member is inserted into the first annular flange, and a first elastic ring is arranged between the outer circumference of the first annular member and the inner circumference of the first annular flange. The inner diameter of the first annular member is not greater than the outer diameter of the central tube, and the inner diameter of the outer port of the tapered hole formed at the outer port of the first annular member is greater than the outer diameter of the central tube.

[0010] When the first annular flange is inserted into the first annular counterbore, the central tube extending into the first annular counterbore can be inserted into the first annular member with the help of the elastic deformation of the first elastic ring, thereby achieving the purpose of guiding the central tube ports on the two reverse osmosis membrane elements to align and connect.

[0011] Optionally, a second annular flange extending in the axial direction is formed on the end surface of the first stress resistor and on the periphery of the port of the central tube, so that a radial spacing is formed between the outer circumference of the second annular flange and the inner circumference of the first annular flange; correspondingly, a second annular counterbore extending in the axial direction is formed on the end surface of the second stress resistor and on the periphery of the port of the central tube.

[0012] A collar assembly is arranged on the second annular flange, and the collar assembly includes an annular elastic member.

[0013] When two reverse osmosis membrane elements are connected, the first annular flange can be inserted into the first annular counterbore, and the second annular flange can be inserted into the second annular counterbore, and a sealing fit is established between the second annular flange and the relative circumferential surface of the second annular counterbore by means of radial deformation of the elastic member of the collar assembly, thereby achieving the purpose of guiding the central tube ports on the two reverse osmosis membrane elements to align and connect.

[0014] Optionally, the collar assembly includes a second annular member and a second elastic ring, and the second elastic ring is fixedly embedded on the inner wall of the second annular member. The second elastic ring can be sleeved on the outer peripheral surface of the second annular flange.

[0015] The outer circumferential surface of the second annular member is formed with a plurality of annular convex bodies distributed alternately in the axial direction, and the side surfaces of the annular convex bodies are protruding arc surfaces extending in the axial direction. The inner circumferential surface of the second elastic ring is formed with a plurality of annular concave bodies distributed alternately in the axial direction, and the side surfaces of the annular concave bodies are concave arc surfaces extending in the axial direction, and an annular protrusion is formed between two adjacent annular concave bodies.

[0016] The corresponding relationship between the annular convex body and the annular concave body is: along the axial direction and on the two circumferential surfaces, the annular concave body is relatively located between two adjacent annular convex bodies and both ends of the annular concave body have an extension length along the axial direction toward the (adjacent) two annular convex bodies (respectively).

[0017] The inner diameter of the second elastic ring or the inner diameter of the annular convex body is consistent with the outer diameter of the second annular flange, so that the maximum inner diameter of the annular concave body is greater than the outer diameter of the second annular flange. The outer diameter of the second annular member is not greater than the outer inner diameter of the second annular counterbore. The inner diameter of the second annular flange is consistent with the inner inner diameter of the second annular counterbore. The maximum outer diameter of the annular convex body is greater than the outer inner diameter of the second annular counterbore and less than the outer port inner diameter of the tapered expansion formed at the port of the second annular counterbore.

[0018] A sealing ring is arranged on the outer peripheral surface of the second annular member. The second annular member and the second annular flange are inserted into the second annular counterbore together and a sealing matching relationship can be established with the help of the sealing ring.

[0019] When the second annular flange is inserted into the second annular counterbore, the second elastic ring can be elastically deformed in the radial direction by means of the extrusion generated between the annular convex body and the outer inner wall of the second annular counterbore, so that the inner wall of the second elastic ring is attached to the outer wall of the second annular flange, and the second annular flange is tightly attached to the relative circumferential surface of the second annular counterbore, thereby establishing a reliable sealing fit.

[0020] Optionally, the collar assembly includes an outer collar, an inner collar, a middle collar and a pair of elastic sealing rings, wherein the elastic sealing rings include a first elastic ring and a second elastic ring.

[0021] The two elastic rings are correspondingly sleeved on the two ends of the middle sleeve ring, so that the first elastic ring is embedded on the inner wall of the port of the middle sleeve ring, and the second elastic ring is embedded on the outer wall of the port of the middle sleeve ring.

[0022] During assembly, the inner ring, the middle ring and the outer ring are sequentially mounted on the outer circumference of the second annular flange, that is, the inner ring is close to the root of the second annular flange, and the outer ring is close to the free end of the second annular flange.

[0023] An axially extending annular convex portion is formed on the end surface of the outer ring facing the middle ring and on the end surface of the inner ring facing the middle ring. The inner circumference and outer circumference of the annular convex portion are both conical annular surfaces, and the inner diameter of the inner circumference gradually decreases from the free end to the root, and the outer diameter of the outer circumference gradually increases from the free end to the root.

[0024] The two side end surfaces of the intermediate ring are formed with annular recesses corresponding to the annular protrusions. The radial width of the annular recesses is not less than the radial width at the free end of the annular protrusions, but less than the radial width at the root of the annular protrusions.

[0025] After the second annular flange and the collar assembly are inserted into the second annular countersunk hole together, the outer end surface of the outer collar can contact the inner bottom surface of the second annular countersunk hole, so that the annular protrusion is gradually inserted into the corresponding annular recess. As the length of the annular protrusion inserted into the annular recess increases, the intermediate collar can be pressed to deform, causing the first elastic ring to deform and fit tightly against the outer peripheral surface / outer wall of the second annular flange, and causing the second elastic ring to deform and fit tightly against the outer inner peripheral surface of the second annular countersunk hole, thereby achieving the purpose of establishing a sealed fit between the second annular flange and the second annular countersunk hole.

[0026] Optionally, at least an annular tooth surface a is formed on the outer circumferential surface of the first annular flange, and correspondingly, an annular tooth surface c that can correspond to and match the annular tooth surface a is formed on the outer inner circumferential surface of the first annular counterbore. The annular tooth surface a and the annular tooth surface c both include a plurality of annular teeth continuously distributed along the axial direction, and the cross section of the annular teeth is triangular.

[0027] The annular tooth surface a formed on the first annular flange can be a plurality of discontinuously distributed segments, and there is a certain axial spacing between two adjacent segments. Correspondingly, the annular tooth surface c formed on the outer inner circumferential surface of the first annular counterbore is also a plurality of discontinuously distributed segments. In specific implementation, an annular tooth surface b can also be formed on the inner circumferential surface of the first annular flange, and correspondingly, an annular tooth surface d that can correspond to and match the annular tooth surface b is formed on the inner circumferential surface of the first annular counterbore. The annular tooth surface b and the annular tooth surface d also include a plurality of annular teeth continuously distributed along the axial direction, and the cross section of the annular teeth is triangular.

[0028] The present invention also provides another reverse osmosis membrane element, which includes an element body including a central tube, and a first stress resistor and a second stress resistor respectively connected to a water production end and a water inlet end of the element body.

[0029] An annular flange extending in the axial direction is formed on the end face of the first stress resistor and on the periphery of the port of the center tube (refer to the second annular flange mentioned above, the same below); correspondingly, an annular countersunk hole extending in the axial direction is formed on the end face of the second stress resistor and on the periphery of the port of the center tube (refer to the second annular countersunk hole mentioned above, the same below).

[0030] The annular flange is provided with a collar assembly including an annular elastic member. When two reverse osmosis membrane elements are connected, the annular flange can be inserted into the annular counterbore, and a sealing fit is established between the annular flange and the relative circumferential surface of the annular counterbore by means of radial deformation of the elastic member of the collar assembly.

[0031] Preferably, the collar assembly comprises a second annular member and a second elastic ring, and the second elastic ring is fixedly embedded on the inner wall of the second annular member. The second elastic ring can be sleeved on the outer peripheral surface of the annular flange.

[0032] A plurality of annular convex bodies distributed alternately in the axial direction are formed on the outer peripheral surface of the second annular member, and the side surfaces of the annular convex bodies are protruding arc surfaces extending in the axial direction.

[0033] A plurality of annular concave bodies which are distributed alternately in the axial direction are formed on the inner circumferential surface of the second elastic ring, and the side surfaces of the annular concave bodies are inner concave arc surfaces extending in the axial direction.

[0034] The corresponding relationship between the annular convex body and the annular concave body is: along the axial direction and on the two circumferential surfaces, the annular concave body is relatively located between two adjacent annular convex bodies, and both ends of the annular concave body have an extension length (respectively) toward the (adjacent) two annular convex bodies along the axial direction;

[0035] The inner diameter of the second elastic ring is consistent with the outer diameter of the annular flange. The outer diameter of the second annular member is not greater than the outer inner diameter of the annular counterbore. The inner diameter of the annular flange is consistent with the inner inner diameter of the annular counterbore. The maximum outer diameter of the annular convex body is greater than the outer inner diameter of the annular counterbore and less than the outer port inner diameter of the conical expansion formed at the annular counterbore port.

[0036] A sealing ring is provided on the outer circumference of the second annular member. The second annular member is inserted into the annular counterbore together with the annular flange and can establish a sealing fit with the aid of the sealing ring. When the annular flange is inserted into the annular counterbore, the second elastic ring can be squeezed and deformed so that its inner wall is pressed against the outer wall of the annular flange.

[0037] Preferably, the collar assembly includes an outer collar, an inner collar, an intermediate collar and a pair of elastic sealing rings, wherein the elastic sealing rings include a first elastic ring and a second elastic ring. The two elastic rings are respectively sleeved on the two ends of the intermediate collar, so that the first elastic ring is embedded in the inner wall of the port of the intermediate collar, and the second elastic ring is embedded in the outer wall of the port of the intermediate collar. During assembly, the inner collar, the intermediate collar and the outer collar are successively sleeved on the annular flange.

[0038] An axially extending annular convex portion is formed on the end surface of the outer ring facing the middle ring and on the end surface of the inner ring facing the middle ring. The inner circumference and outer circumference of the annular convex portion are both conical annular surfaces, and the inner diameter of the inner circumference gradually decreases from the free end to the root, and the outer diameter of the outer circumference gradually increases from the free end to the root.

[0039] The two side end surfaces of the intermediate ring are formed with annular recesses corresponding to the annular protrusions. The radial width of the annular recesses is not less than the radial width at the free end of the annular protrusions, but less than the radial width at the root of the annular protrusions.

[0040] After the annular flange and the collar assembly are inserted into the annular counterbore together, the outer end surface of the outer collar can contact the inner bottom surface of the annular counterbore, and the annular convex portion is gradually inserted into the corresponding annular concave portion. As the length of the annular convex portion inserted into the annular concave portion increases, the intermediate collar can be pressed to deform, causing the first elastic ring to deform and closely abut against the outer wall of the annular flange, and causing the second elastic ring to deform and closely abut against the outer inner circumferential surface of the annular counterbore.

[0041] The present invention also provides a reverse osmosis membrane device, which comprises a membrane shell and a plurality of reverse osmosis membrane elements, and the reverse osmosis membrane elements are selected from any one of the reverse osmosis membrane elements mentioned above.

[0042] The beneficial effect of the present invention is that the reverse osmosis membrane element and device provided by the present invention can save the use of a central tube connector in the alignment connection structure of the reverse osmosis membrane element, thereby achieving the purpose of reducing water production resistance and increasing water production per unit time.

[0043] In addition, compared with the prior art, the two stress reducers configured at the water inlet and outlet ends of the reverse osmosis membrane (element) have basically the same structure, the only difference is that the stress reducer configured at the water inlet end of the reverse osmosis membrane element is provided with a sealing ring, while the one at the water outlet end is not provided with a sealing ring, which can easily cause misidentification during installation and cause the stress reducers at both ends to be installed upside down. The first stress reducer and the second stress reducer matched with the two reverse osmosis membrane elements involved in the present invention have significant differences in appearance and can be easily distinguished, which helps to significantly reduce the probability of reverse installation risk and helps to avoid the reduction in water production caused by this. BRIEF DESCRIPTION OF THE DRAWINGS

[0044] Figure 1 It is a schematic structural diagram of a first embodiment of a reverse osmosis membrane element (wherein the element body only shows the central tube, and the following embodiments also only show the central tube).

[0045] Figure 2 This is a schematic structural diagram of a second embodiment of a reverse osmosis membrane element.

[0046] Figure 3It is a schematic structural diagram of the third embodiment of the reverse osmosis membrane element.

[0047] Figure 4 It is a schematic diagram of the cross-sectional structure of the first ring assembly.

[0048] Figure 5 It is a structural schematic diagram of a fourth embodiment of a reverse osmosis membrane element.

[0049] Figure 6 This is a schematic diagram of the structure of the fifth embodiment of the reverse osmosis membrane element.

[0050] Figure 7 for Figure 6 Schematic diagram of the local enlarged structure at point A in the middle.

[0051] Figure 8 It is a schematic diagram of the cross-sectional structure of the second ring assembly.

[0052] In the figure: 100 center tube a, 101 first stress resister; 200 center tube b, 201 second stress resister; 10 first annular flange, 11 first sealing ring, 12 annular tooth surface a, 13 annular tooth surface b; 20 first annular counterbore, 21 first annular pad, 22 annular tooth surface c, 23 annular tooth surface d; 30 first annular member; 40 first elastic ring; 50 second annular flange, 60 second annular counterbore, 61 second annular pad; 70 first sleeve ring assembly, 71 second annular member, 711 annular convex body, 72 second elastic ring, 721 annular concave body, 722 annular protrusion; 80 second sleeve ring assembly, 81 outer sleeve ring, 82 inner sleeve ring, 83 annular convex part, 84 middle sleeve ring, 841 outer end side, 842 inner end side, 843 annular concave part, 85 first elastic ring, 86 second elastic ring. DETAILED DESCRIPTION

[0053] The structures, proportions, sizes, etc. illustrated in the drawings of the specification are only used to match the contents disclosed in the specification for people familiar with this technology to understand and read, and are not used to limit the limiting conditions for the implementation of the present invention, so they have no substantial technical significance. Any modification of the structure, change of the proportion relationship or adjustment of the size, without affecting the effects and purposes that can be achieved by the present invention, should still fall within the scope of the technical contents disclosed by the present invention. At the same time, the terms such as "upper", "lower", "front", "back", "middle" and so on quoted in this specification are only for the convenience of description, and are not used to limit the scope of the implementation of the present invention. The change or adjustment of their relative relationship should also be regarded as the scope of the implementation of the present invention without substantially changing the technical contents.

[0054] like Figures 1 to 8A reverse osmosis membrane element shown in the figure includes an element body including a central tube (only the central tube is shown in the figure, and other parts of the element body are not shown, which are mostly roll-type reverse osmosis membranes), and a first stress resistor 101 (or water production end stress resistor) connected to the water production end of the element body and a second stress resistor 201 (or water inlet end stress resistor) connected to the water inlet end of the element body. In the figure, the central tubes of the two butted element bodies are central tube a100 and central tube b200, respectively, the first stress resistor 101 is arranged at the end (i.e., the right end) of the central tube a100, and the second stress resistor 201 is arranged at the end (i.e., the left end) of the central tube b200.

[0055] Embodiment 1: Figure 1 A reverse osmosis membrane element shown in the figure has an improved structure as follows: on the right end face of the first stress reducer 101, a first annular flange 10 extending in the axial direction is formed on the periphery of the port (or the periphery of the end) of the central tube a100, and a first sealing ring 11 is provided on the outer peripheral surface of the first annular flange 10. The inner diameter of the first annular flange 10 is larger than the outer diameter of the central tube a100. On the left end face of the second stress reducer 201, a first annular counterbore 20 extending in the axial direction is formed on the periphery of the port (or the periphery of the end) of the central tube b200. A radial spacing is formed between the small-diameter inner peripheral surface of the first annular counterbore 20 and the outer peripheral surface of the central tube b200.

[0056] Optionally, a first annular pad 21 is disposed at the inner bottom of the first annular counterbore 20 .

[0057] When two reverse osmosis membrane elements are connected, the first annular flange 10 can be inserted into the first annular countersunk hole 20, and with the help of the first sealing ring 11, a sealing fit is established between the relative circumferential surfaces of the two (i.e., the outer circumferential surface of the first annular flange 10 and the large-diameter inner circumferential surface of the first annular countersunk hole 20), and the purpose of guiding the center tube a100 port and the center tube b200 port on the two reverse osmosis membrane elements to align and connect is achieved.

[0058] An elastic sealing gasket may be arranged between the opposite end faces of the first stress resistor 101 and the second stress resistor 201. When the two stress resistors are connected (when the bolts are tightened or after clamping), the axial force applied to the two can deform the elastic sealing gasket and establish a sealing fitting relationship between the opposite faces.

[0059] When the first annular pad 21 is arranged at the inner bottom of the first annular counterbore 20, after the first annular flange 10 is inserted into the first annular counterbore 20, the end surface of the first annular flange 10 can be pressed on the first annular pad 21, and a sealing fit is formed at the junction of the end surfaces of the two. During assembly, the axial pressure transmitted to the two stress resistors by the connection structure / compression structure can cause the end surface of the first annular flange 10 and the inner bottom surface of the first annular counterbore 20 to press the first annular pad 21 to establish a sealing fit.

[0060] Embodiment 2: Figure 2 The reverse osmosis membrane element shown is different from the previous embodiment in that a first annular member 30 and a first elastic ring 40 are added, and one end of the central tube b200 is directly inserted into the first annular counterbore 20, that is, the first annular counterbore 20 at this time is a cylindrical counterbore structure, and when the end of the central tube b200 is inserted into the first annular counterbore 20, it is understood that the outer peripheral surface of the central tube b200 is formed as the small-diameter inner peripheral surface of the first annular counterbore 20. The other parts of this embodiment are the same as those of the first embodiment and are not repeated.

[0061] Specifically, the end of the central tube a100 extends to the inner port of the first annular flange 10, and the port of the central tube a100 can be substantially flush with the inner bottom surface of the first annular flange 10 as shown in the figure, or the port of the central tube a100 can be retracted inward or extended by a shorter axial length relative to the inner bottom surface of the first annular flange 10. At the same time, the end of the central tube b200 is extended into the first annular counterbore 20 accordingly.

[0062] The first annular member 30 is inserted into the first annular flange 10, and the first elastic ring 40 is provided between the outer circumference of the first annular member 30 and the inner circumference of the first annular flange 10. The inner diameter of the first annular member 30 is consistent with the outer diameter of the central tube b200, and the inner diameter of the outer port of the tapered hole formed at the outer port of the first annular member 30 is larger than the outer diameter of the central tube b200, so as to facilitate the smooth insertion of the end of the central tube b200 into the first annular member 30.

[0063] When the first annular flange 10 is inserted into the first annular counterbore 20 , the center pipe b200 can be inserted into the first annular member 30 by means of elastic deformation of the first elastic ring 40 in the radial direction.

[0064] The first elastic ring 40 may be embedded on the outer circumference of the first annular member 30 and form an integral structure with the first annular member 30; it may also be embedded on the inner circumference of the first annular flange 10 and form an integral structure with the first annular flange 10; it may also be a structure that is tightly sleeved on the outer circumference of the first annular member 30 (by means of elastic deformation). Therefore, there must be a certain radial (size) difference between the outer diameter of the first annular member 30 and the inner diameter of the first annular flange 10 to accommodate the wall thickness of the first elastic ring 40, and after the center tube b200 is inserted into the first annular member 30, the wall thickness of the first elastic ring 40 can also be deformed to a certain extent (mainly manifested as thinning).

[0065] In the solution of this embodiment, when the first annular flange 10 is plugged and connected with the first annular counterbore 20, the inner circumference of the first annular flange 10 is opposite to the outer circumference of the center tube b200. By configuring the first annular member 30 and the first elastic ring 40 in the first annular flange 10 and setting the relevant inner diameter and outer diameter size parameters according to certain requirements, on the one hand, it can avoid the problem of difficulty in alignment and plugging when the central axis of the first annular flange 10 and the central axis of the center tube b200 are not colinear and the eccentricity difference is large during the plug-in process, and on the other hand, it can also help reduce the difficulty of processing and assembly, and can enhance the plug-in fit tightness between the first annular flange 10 or the first annular member 30 and the center tube b200, forming a first sealing structure, and can better adapt to the high pressure / high water pressure environment in the operation scene.

[0066] Embodiment 3: Compared with Embodiment 1, this embodiment is additionally provided with a second annular flange 50 and a second annular counterbore 60, as well as other associated structural features. The other parts are the same as those of Embodiment 1 and will not be described in detail.

[0067] like Figure 3 to Figure 4 The reverse osmosis membrane element shown in the figure has a second annular flange 50 extending in the axial direction formed on the end surface of the first stress resistor 101 and on the periphery of the port of the central tube a100, so that a radial spacing is formed between the outer circumference of the second annular flange 50 and the inner circumference of the first annular flange 10; correspondingly, a second annular counterbore 60 extending in the axial direction is formed on the end surface of the second stress resistor 201 and on the periphery of the port of the central tube b200. Obviously, the second annular counterbore 60 is located inside the first annular counterbore 20.

[0068] A first collar assembly 70 is provided on the second annular flange 50. The first collar assembly 70 includes a second annular member 71 and a second elastic ring 72, and the second elastic ring 72 is fixedly embedded on the inner wall of the second annular member 71. The second elastic ring 72 can be sleeved on the outer circumferential surface of the second annular flange 50.

[0069] When two reverse osmosis membrane elements are connected, the first annular flange 10 can be inserted into the first annular countersunk hole 20, and the second annular flange 50 can be inserted into the second annular countersunk hole 60, and a sealing fit is established between the relative circumferential surfaces of the second annular flange 50 and the second annular countersunk hole 60 by means of the radial deformation generated by the second elastic ring 72, thereby achieving the purpose of guiding the central tube ports on the two reverse osmosis membrane elements to align and connect.

[0070] Specifically, Figure 4 As shown, a plurality of annular convex bodies 711 are formed on the outer circumferential surface of the second annular member 71 and are distributed alternately in the axial direction, and the side surface of the annular convex body 711 is a protruding arc surface extending in the axial direction. A plurality of annular concave bodies 721 are formed on the inner circumferential surface of the second elastic ring 72 and are distributed alternately in the axial direction, and the side surface of the annular concave body 721 is an inner concave arc surface extending in the axial direction, and an annular protrusion 722 is formed between two adjacent annular concave bodies 721. The width (dimensional parameter along the axial direction) of the annular protrusion 722 is significantly smaller than the width of the annular concave body 721.

[0071] See Figure 4 As shown, the corresponding relationship between the annular convex body 711 and the annular concave body 721 is: along the axial direction and on the two circumferential surfaces, the annular concave body 721 is relatively located between the two adjacent annular convex bodies 711, and the two ends of the annular concave body 721 have a certain extension length along the axial direction toward the two adjacent annular convex bodies 711. The inner diameter d1 of the second elastic ring 72 is consistent with the outer diameter D1-1 of the second annular flange 50, so that the maximum inner diameter of the annular concave body 721 is greater than the outer diameter of the second annular flange 50. The outer diameter d2 of the second annular member 71 is not greater than the outer inner diameter D2-1 of the second annular counterbore 60. The inner diameter D1-2 of the second annular flange 50 is consistent with the inner inner diameter D2-2 of the second annular counterbore 60. The maximum outer diameter d3 of the annular convex body 711 is greater than the outer inner diameter D2-1 of the second annular counterbore 60 and less than the outer port inner diameter of the tapered expansion formed at the port of the second annular counterbore 60.

[0072] A sealing ring (not shown) is provided on the outer circumferential surface of the second annular member 71. When the second annular flange 50 or the second annular member 71 is inserted into the second annular counterbore 60 together with the second annular flange 50, a sealing fit can be established between the relative circumferential surfaces of the two with the help of the sealing ring provided on the outer circumferential surface of the second annular member 71.

[0073] When the second annular flange 50 is inserted into the second annular counterbore 60, the second elastic ring 72 can be elastically deformed in the radial direction by means of the extrusion between the annular protrusion 711 and the outer inner wall of the second annular counterbore 60, so that the inner wall of the second elastic ring 72 is pressed against the outer wall of the second annular flange 50 (so that the relative circumferential surfaces between the two can be completely in contact, that is, the surface of the annular concave body 721 is pressed against the outer wall / outer circumferential surface of the second annular flange 50), so that the relative circumferential surfaces of the second annular flange 50 and the second annular counterbore 60 are pressed tightly to establish a reliable sealing fit. That is, the arrangement of the second annular member 71 and the second elastic ring 72 can generate a radial extrusion force between the matching circumferential surfaces of the second annular flange 50 and the second annular counterbore 60, so as to form a reliable sealing fit between the two pairs of relative circumferential surfaces.

[0074] Optionally, a second annular pad 61 is provided at the inner bottom of the second annular counterbore 60. When the second annular flange 50 is inserted into the second annular counterbore 60, the end surface of the second annular flange 50 can be pressed on the second annular pad 61, and a sealing fit is formed at the junction of the end surfaces of the two. During assembly, the axial pressure transmitted to the two stress resistors by the connection structure / compression structure can cause the end surface of the second annular flange 50 and the inner bottom surface of the second annular counterbore 60 to press the second annular pad 61, thereby establishing a sealing fit.

[0075] Compared with the solution of the first embodiment, the solution of this embodiment adds a sealing structure, which can enable the reverse osmosis element to adapt to a higher pressure environment on the one hand; on the other hand, it can reduce the requirements for processing accuracy (mold accuracy) and assembly difficulty, and help improve the (sealing) effect after assembly.

[0076] The axial extension length of the second annular flange 50 shown in the figure is greater than the axial extension length of the first annular flange 10, and correspondingly, the axial extension depth of the second annular counterbore 60 is also greater than the axial extension depth of the first annular counterbore 20. It is also possible that the axial length of the second annular flange 50 is less than the axial length of the first annular flange 10, and the axial depth of the second annular counterbore 60 is less than the axial depth of the first annular counterbore 20.

[0077] Embodiment 4: Based on the embodiment 3, this embodiment improves the inner and outer peripheral structures of the first annular flange 10 to keep the axial coupling force of the two stress resisters connected in a stable and reliable state and reduce the difficulty of assembly. Other structural features can refer to the embodiment 3 and will not be described in detail.

[0078] like Figure 5 The reverse osmosis membrane element shown has an annular tooth surface a12 formed on the outer circumferential surface of the first annular flange 10, and an annular tooth surface b13 formed on the inner circumferential surface of the first annular flange 10, and correspondingly, an annular tooth surface c22 that can correspond to the annular tooth surface a12 is formed on the outer inner circumferential surface of the first annular counterbore 20, and an annular tooth surface d23 that can correspond to the annular tooth surface b13 is formed on the inner circumferential surface of the first annular counterbore 20.

[0079] The annular tooth surface a12, the annular tooth surface b13, the annular tooth surface c22 and the annular tooth surface d23 all include a plurality of annular teeth (or annular tooth portions) continuously distributed along the axial direction, and the cross-section of the annular teeth is in the shape of an isosceles or equilateral triangle.

[0080] The annular tooth surface a12 formed on the first annular flange 10 is configured as two discontinuously distributed sections, that is, there is a certain axial spacing between the two sections. Correspondingly, the annular tooth surface c22 formed on the outer inner circumferential surface of the first annular counterbore 20 is also configured as two discontinuously distributed sections. Generally speaking, the axial extension length of the annular tooth surface c22 is greater than the axial extension length of the annular tooth surface a12. In other words, the number of annular teeth included in the annular tooth surface c22 is greater than the number of annular teeth included in the annular tooth surface a12.

[0081] The annular tooth surface b13 formed on the first annular flange 10 is a segment and is located at the opposite side of the area between the two segments of the annular tooth surface a12. Correspondingly, the annular tooth surface d23 formed on the first annular counterbore 20 is also a segment and is located at the opposite side of the area between the two segments of the annular tooth surface c22.

[0082] The improved structure of this embodiment can strengthen the axial retention ability after the first annular flange 10 is connected to the first annular counterbore 20. When the first annular flange 10 is inserted into the first annular counterbore 20, the annular tooth surface a12 can mesh with the annular tooth surface c22 to generate an axial force, and at the same time, the annular tooth surface b13 can mesh with the annular tooth surface d23 to generate an axial force. The axial force formed between the annular tooth surfaces can strengthen the retention of the connection structure between the two stress resisters, so that the relative surfaces of the two stress resisters can firmly and reliably maintain a tightly fitted state to avoid disengagement, which helps to improve the sealing. In particular, when associated with the structural features of the first annular pad 21 and / or the second annular pad 61, the stability, reliability and sealing of the sealing structure formed between the end face of the annular flange and the inner bottom surface of the annular counterbore can be improved. In addition, when combined with the following embodiments, the difficulty of assembly can be significantly reduced.

[0083] Embodiment 5: This embodiment differs from Embodiment 4 in the specific implementation structure of the collar assembly. Other features may refer to Embodiment 4 and will not be described in detail.

[0084] like Figures 6 to 8 The reverse osmosis membrane element shown in the figure has a second annular flange 50 extending in the axial direction formed on the end surface of the first stress resistor 101 and on the periphery of the port of the central tube a100, so that a radial spacing is formed between the outer circumference of the second annular flange 50 and the inner circumference of the first annular flange 10; correspondingly, a second annular counterbore 60 extending in the axial direction is formed on the end surface of the second stress resistor 201 and on the periphery of the port of the central tube b200. Obviously, the second annular counterbore 60 is located inside the first annular counterbore 20. A second collar assembly 80 is provided on the second annular flange 50.

[0085] The second collar assembly 80 includes an outer collar 81 , an inner collar 82 , a middle collar 84 and a pair of elastic sealing rings, wherein the elastic sealing rings include a first elastic ring 85 and a second elastic ring 86 .

[0086] The two elastic rings are correspondingly sleeved on the two ends of the middle ring 84 , so that the first elastic ring 85 is embedded on the inner wall of the port of the middle ring 84 , and the second elastic ring 86 is embedded on the outer wall of the port of the middle ring 84 .

[0087] During assembly, the inner collar 82, the middle collar 84, and the outer collar 81 are sequentially mounted on the outer circumferential surface / outer wall of the second annular flange 50, that is, the inner collar 82 is close to the root of the second annular flange 50, and the outer collar 81 is close to the free end of the second annular flange 50. In the initial state, the overall axial length of the inner collar 82, the middle collar 84, and the outer collar 81 is greater than the axial length of the second annular flange 50 (see Figure 6 , Figure 7 ), but when the three are plugged into each other, the overall axial length of the three can be close to or consistent with the axial length of the second annular flange 50. For ease of description, the side of the intermediate collar 84 close to the outer collar 81 is named the outer end side 841, and the side of the intermediate collar 84 close to the inner collar 82 is named the inner end side 842.

[0088] An axially extending annular protrusion 83 is formed on the end surface of the outer collar 81 facing the middle collar 84, and on the end surface of the inner collar 82 facing the middle collar 84. The inner circumference and outer circumference of the annular protrusion 83 are both conical annular surfaces, and the inner diameter of the inner circumference gradually decreases from the free end to the root, and the outer diameter of the outer circumference gradually increases from the free end to the root.

[0089] An annular recess 843 corresponding to the annular protrusion 83 is formed on both side end surfaces of the intermediate collar 84. The radial width of the annular recess 843 is not less than the radial width at the free end of the annular protrusion 83, but is less than the radial width at the middle of the annular protrusion 83, and is obviously smaller than the radial width at the root.

[0090] After the second annular flange 50 and the second sleeve ring assembly 80 are inserted into the second annular counterbore 60 together, the outer end surface of the outer sleeve ring 81 can contact the inner bottom surface of the second annular counterbore 60, so that the annular protrusion 83 is gradually inserted into the corresponding annular recess 843. As the length of the annular protrusion 83 inserted into the annular recess 843 increases, the side wall of the annular protrusion 83 can compress the two end walls of the intermediate sleeve ring 84 to deform, thereby causing the first elastic ring 85 to deform and fit tightly against the outer peripheral surface / outer wall of the second annular flange 50, and causing the second elastic ring 86 to deform and fit tightly against the outer inner peripheral surface of the second annular counterbore 60, thereby achieving the purpose of establishing a reliable sealing matching structure between the second annular flange 50 and the second annular counterbore 60.

[0091] The improved collar assembly 80 of the present embodiment can further enhance the sealing effect between the second annular flange 50 and the second annular counterbore 60, and better prevent raw water from intruding into the central tube, so that when the central tube connector is omitted, the reverse osmosis membrane element and the device can operate stably and reliably, and the reverse osmosis membrane element can adapt to a higher pressure environment.

[0092] The above embodiments are merely illustrative of the principles and effects of the present invention, and are not intended to limit the present invention. The present invention can be improved in many aspects without violating the overall concept, and those familiar with the technology can modify or change the above embodiments without violating the spirit and scope of the present invention. Therefore, all equivalent modifications or changes made by those with ordinary knowledge in the technical field without departing from the spirit and technical ideas disclosed by the present invention should still be covered by the claims of the present invention.

Claims

1. A reverse osmosis membrane element, comprising an element body including a central tube, and a first stress reducer (101) and a second stress reducer (201) respectively connected to a water production end and a water inlet end of the element body; characterized in that: A first annular flange (10) is formed on the end surface of the first stress resistor (101) and on the periphery of the port of the central tube; a first sealing ring (11) is provided on the outer peripheral surface of the first annular flange (10); and a first annular counterbore (20) is formed on the end surface of the second stress resistor (201) and on the periphery of the port of the central tube; When two reverse osmosis membrane elements are connected, the first annular flange (10) can be inserted into the first annular counterbore (20), and a sealing fit is established between the matching surfaces of the two with the aid of the first sealing ring (11), thereby achieving the purpose of guiding the central tube ports on the two reverse osmosis membrane elements to align and connect; The end of one central tube extends to the inner port of the first annular flange (10), and the end of another central tube aligned and connected thereto extends into the first annular counterbore (20); A first annular member (30) is inserted into the first annular flange (10), and a first elastic ring (40) is provided between the outer circumferential surface of the first annular member (30) and the inner circumferential surface of the first annular flange (10); the inner diameter of the first annular member (30) is not greater than the outer diameter of the central tube, and the inner diameter of the outer port of the tapered hole formed at the outer port of the first annular member (30) is greater than the outer diameter of the central tube; When the first annular flange (10) is inserted into the first annular counterbore (20), the center tube extending into the first annular counterbore (20) can be inserted into the first annular member (30) by means of elastic deformation of the first elastic ring (40).

2. A reverse osmosis membrane element, comprising an element body including a central tube, and a first stress reducer (101) and a second stress reducer (201) respectively connected to a water production end and a water inlet end of the element body; characterized in that: A first annular flange (10) is formed on the end surface of the first stress resistor (101) and on the periphery of the port of the central tube; a first sealing ring (11) is provided on the outer peripheral surface of the first annular flange (10); and a first annular counterbore (20) is formed on the end surface of the second stress resistor (201) and on the periphery of the port of the central tube; When two reverse osmosis membrane elements are connected, the first annular flange (10) can be inserted into the first annular counterbore (20), and a sealing fit is established between the matching surfaces of the two with the aid of the first sealing ring (11), thereby achieving the purpose of guiding the central tube ports on the two reverse osmosis membrane elements to align and connect; A second annular flange (50) extending in the axial direction is formed on the end surface of the first stress resistor (101) and on the periphery of the port of the center tube, and a radial spacing is formed between the outer circumference of the second annular flange (50) and the inner circumference of the first annular flange (10); correspondingly, a second annular counterbore (60) extending in the axial direction is formed on the end surface of the second stress resistor (201) and on the periphery of the port of the center tube; a collar assembly including an annular elastic member is provided on the second annular flange (50); When two reverse osmosis membrane elements are connected, the first annular flange (10) can be inserted into the first annular countersunk hole (20), and the second annular flange (50) can be inserted into the second annular countersunk hole (60), and a sealing fit is established between the relative circumferential surfaces of the second annular flange (50) and the second annular countersunk hole (60) by means of radial deformation generated by the elastic member of the collar assembly.

3. The reverse osmosis membrane element according to claim 2, characterized in that: The collar assembly comprises a second annular member (71) and a second elastic ring (72), and the second elastic ring (72) is fixedly embedded on the inner wall of the second annular member (71); the second elastic ring (72) can be sleeved on the outer peripheral surface of the second annular flange (50); A plurality of annular convex bodies (711) are formed on the outer peripheral surface of the second annular member (71) and are distributed alternately in the axial direction, and the side surfaces of the annular convex bodies (711) are protruding arc surfaces extending in the axial direction; A plurality of annular concave bodies (721) are formed on the inner circumferential surface of the second elastic ring (72) and are distributed alternately in the axial direction, and the side surfaces of the annular concave bodies (721) are inwardly concave arc surfaces extending in the axial direction; The corresponding relationship between the annular convex body (711) and the annular concave body (721) is that the annular concave body (721) is relatively located between two adjacent annular convex bodies (711) and both ends of the annular concave body (721) extend toward the sides of the two annular convex bodies (711); The inner diameter of the second elastic ring (72) is consistent with the outer diameter of the second annular flange (50); the outer diameter of the second annular member (71) is not greater than the outer inner diameter of the second annular counterbore (60); the inner diameter of the second annular flange (50) is consistent with the inner inner diameter of the second annular counterbore (60); the maximum outer diameter of the annular protrusion (711) is greater than the outer inner diameter of the second annular counterbore (60) and smaller than the outer inner diameter of the tapered expansion formed at the port of the second annular counterbore (60); A sealing ring is provided on the outer circumferential surface of the second annular member (71); the second annular member (71) and the second annular flange (50) are inserted into the second annular counterbore (60) together and can establish a sealing fit with the aid of the sealing ring; when the second annular flange (50) is inserted into the second annular counterbore (60), the second elastic ring (72) can be squeezed and deformed, so that its inner wall is pressed against the outer wall of the second annular flange (50).

4. The reverse osmosis membrane element according to claim 2, characterized in that: The collar assembly comprises an outer collar (81), an inner collar (82), an intermediate collar (84) and a pair of elastic sealing rings; the elastic sealing rings comprise a first elastic ring (85) and a second elastic ring (86); the two elastic rings are respectively sleeved on the two ends of the intermediate collar (84), so that the first elastic ring (85) is embedded in the inner wall of the port of the intermediate collar (84), and the second elastic ring (86) is embedded in the outer wall of the port of the intermediate collar (84); during assembly, the inner collar (82), the intermediate collar (84) and the outer collar (81) are sleeved on the second annular flange (50) in sequence; An axially extending annular protrusion (83) is formed on the end surface of the outer ring (81) facing the middle ring (84) and on the end surface of the inner ring (82) facing the middle ring (84); the inner circumferential surface and the outer circumferential surface of the annular protrusion (83) are both conical annular surfaces, and the inner diameter of the inner circumferential surface gradually decreases from the free end to the root, while the outer diameter of the outer circumferential surface gradually increases from the free end to the root; An annular recess (843) corresponding to the annular protrusion (83) is formed on both side end surfaces of the intermediate collar (84); the radial width of the annular recess (843) is not less than the radial width of the free end of the annular protrusion (83), but less than the radial width of the root of the annular protrusion (83); After the second annular flange (50) and the collar assembly are inserted into the second annular counterbore (60), the outer end surface of the outer collar (81) can contact the inner bottom surface of the second annular counterbore (60), so that the annular protrusion (83) is gradually inserted into the corresponding annular recess (843); as the length of the annular protrusion (83) inserted into the annular recess (843) increases, the intermediate collar (84) can be pressed to deform, causing the first elastic ring (85) to deform and closely abut against the outer wall of the second annular flange (50), and causing the second elastic ring (86) to deform and closely abut against the outer inner circumferential surface of the second annular counterbore (60).

5. The reverse osmosis membrane element according to claim 2, characterized in that: An annular tooth surface a (12) is formed at least on the outer circumferential surface of the first annular flange (10), and correspondingly, an annular tooth surface c (22) that can match the annular tooth surface a (12) is formed on the outer inner circumferential surface of the first annular counterbore (20); the annular tooth surface a (12) and the annular tooth surface c (22) both include a plurality of annular teeth continuously distributed along the axial direction, and the cross-section of the annular teeth is triangular.

6. A reverse osmosis membrane device, comprising a membrane shell and a plurality of reverse osmosis membrane elements, characterized in that: The reverse osmosis membrane element is the reverse osmosis membrane element according to any one of claims 1 to 5.

Images