Water stop belt structure of reverse osmosis membrane element

Abstract

The utility model relates to the field of water treatment equipment, and discloses a water-stop belt structure of a reverse osmosis membrane element, which comprises a water-stop belt arranged on the reverse osmosis membrane element, the water stop belt comprises a barrel, an annular external expansion part arranged at the top of the barrel, a first sealing lip arranged at the bottom of the external expansion part and contracting inwards, and a framework. The framework comprises a lantern ring arranged in the cylinder body, and first elastic sheets and second elastic sheets which are respectively arranged in the external expansion part and the first sealing lip; the plurality of first elastic sheets and second elastic sheets form an integral circular array at the top of the lantern ring; and the water-stop belt is formed by coating a rubber material outside the framework. The deformation restoring force of the external expansion part is increased through the first elastic piece, so that the external expansion part is tightly attached to the inner wall of the membrane shell to achieve the sealing effect, the first sealing lip can make contact with the inner wall of the membrane shell after the external expansion part deforms, the sealing effect is improved, and the second elastic piece can effectively prevent the water stop belt from deforming after entering the membrane shell.

Description

Technical Field

[0001] The utility model relates to the field of water treatment equipment, in particular to a water stop strip structure of a reverse osmosis membrane element. Background Art

[0002] Reverse osmosis membrane elements are commonly used components in water purification equipment. In order to save space and facilitate installation, existing reverse osmosis membrane elements are all wound in a spiral along the central water production pipe to form a cylindrical shape consisting of multiple layers of tight membrane bags, namely, a rolled reverse osmosis membrane element.

[0003] At present, the water inlet seal of the existing reverse osmosis membrane elements is achieved by forming a sealing structure between the waterstop strip on the membrane body (it can also be said to be a sealing ring) and the membrane shell to isolate the raw water from the concentrated water. For example: The Chinese patent application with the application date of 2023-12-08 and the application number CN202323347711.X discloses an N-type sealing ring and a reverse osmosis membrane element using the N-type sealing ring. The contact area between the sealing ring and the membrane shell is increased by the second sealing lip, so that the sealing is better; the cylindrical body is tightly attached to the membrane body, and its second sealing lip is tightly attached to the inner wall of the membrane shell, which together play a role in sealing between the incoming water and the concentrated water, so there is no need to wrap the waterstop tape during the production process, which reduces the material cost. This N-type sealing ring has the following problems:

[0004] 1. The material of the sealing ring is generally rubber, which is relatively soft. During installation, as the reverse osmosis membrane element goes deeper into the membrane shell, the friction of the N-type sealing ring gradually increases (because the contact area is getting larger and larger). There may be a problem that the first sealing lip is displaced relative to the second sealing lip, causing the second sealing lip to turn upward and fall out of the first sealing lip, affecting the sealing effect;

[0005] 2. The N-type sealing ring is installed on the membrane body simply by relying on the tightening force of the rubber material. It may be displaced by the pressure in the raw water cavity. Therefore, the position of the sealing ring cannot be ensured without using winding tape.

[0006] Based on this, the present application provides a waterstop structure for a reverse osmosis membrane element that has a more reasonable design, good sealing effect and can ensure the position of the waterstop. Utility Model Content

[0007] The utility model aims to solve the technical problems existing in the prior art. To this end, the utility model provides a

[0008] The technical solution adopted by the utility model to solve its technical problems is:

[0009] Provide a water stop structure for a reverse osmosis membrane element, including a water stop installed on the reverse osmosis membrane element; the water stop includes a cylinder body, an annular outward expansion part arranged at the top of the cylinder body, an inwardly retracted first sealing lip arranged at the bottom of the outward expansion part, and a skeleton; the skeleton includes a collar arranged inside the cylinder body, and a first elastic sheet and a second elastic sheet respectively arranged inside the outward expansion part and the first sealing lip, and a plurality of the first elastic sheets and the second elastic sheets form an integral circular array on the top of the collar; the water stop is made of a rubber material coated outside the skeleton.

[0010] In a preferred embodiment of the present invention, the inner diameter of the cylinder body is smaller than the outer diameter of the reverse osmosis membrane element, and a chamfer with a diameter larger than the outer diameter of the reverse osmosis membrane element is arranged at the bottom of the cylinder body.

[0011] In a preferred embodiment of the present invention, multiple circles of grooves are further arranged on the first sealing lip, and the cross-section of the groove is one of a rectangle, a trapezoid, a triangle, and an arc.

[0012] In a preferred embodiment of the present invention, a second sealing lip is further arranged on one side of the end of the outward expansion part away from the cylinder body facing the reverse osmosis membrane element.

[0013] In a preferred embodiment of the present invention, it further includes a heat shrinkable sleeve. One end of the heat shrinkable sleeve is sleeved on the cylinder body and the cylinder body is wrapped by a hot air gun. After the water stop is installed in place, the other end of the heat shrinkable sleeve is also wrapped around the reverse osmosis membrane element by a hot air gun.

[0014] In a preferred embodiment of the present invention, both the first elastic sheet and the second elastic sheet are made of spring steel.

[0015] Compared with the prior art, the beneficial effects of the present invention are:

[0016] 1. By arranging a skeleton inside the water stop in the present invention, the deformation recovery force of the outward expansion part is increased by using the first elastic sheet, so that the outward expansion part is closely attached to the inner wall of the membrane shell to play a sealing role. After the outward expansion part deforms, the first sealing lip can also contact the inner wall of the membrane shell to increase the sealing effect. The second elastic sheet can effectively prevent the water stop from deforming after entering the membrane shell, and solves the problem that the first sealing lip may upwardly escape from the outward expansion part;

[0017] 2. After the outward expansion part deforms, the second sealing lip can contact the reverse osmosis membrane element to play a sealing effect. At the same time, the second sealing lip is squeezed by the raw water water pressure to further increase the pressure between the outward expansion part and the membrane shell, improving the sealing performance;

[0018] 3. The heat-shrinkable sleeve can, on the one hand, seal between the cylinder of the water stop and the reverse osmosis membrane element, and on the other hand, can also fix the position of the water stop on the reverse osmosis membrane element. At the same time, compared with winding tape, the heat-shrinkable sleeve is more convenient to install. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following will briefly introduce the drawings required for the description of the embodiments. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings, where:

[0020] Figure 1 is a cross-sectional view of the water stop provided by the present invention;

[0021] Figure 2 is Figure 1 a schematic structural diagram of the provided skeleton;

[0022] Figure 3 is an installation structure diagram of the water stop provided by the present invention on the reverse osmosis membrane element;

[0023] Figure 4 is an installation schematic diagram of the reverse osmosis membrane element in the membrane provided by the present invention.

[0024] In the drawings, the list of components represented by each reference numeral is as follows:

[0025] 1 - water stop, 1.1 - cylinder, 1.2 - outward expansion part, 1.3 - first sealing lip, 1.3.1 - groove, 1.4 - skeleton, 1.4.1 - collar, 1.4.2 - first elastic piece, 1.4.3 - second elastic piece, 1.5 - second sealing lip, 2 - heat-shrinkable sleeve, 10 - reverse osmosis membrane element, 20 - membrane housing. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0026] It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0027] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the drawings in the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, rather than all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the scope of protection of the present invention.

[0028] In the description of the present utility model, it should be noted that the orientation or positional relationship indicated by terms such as "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation to the present utility model;

[0029] In addition, in the present utility model, the descriptions involving terms such as "first" and "second" are only for descriptive purposes, and cannot be understood as indicating or implying their relative importance or implicitly indicating the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include at least one such feature. The terms "installation", "connection", and "connection" should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or an integral connection; it may be a mechanical connection or an electrical connection; it may be directly connected, or indirectly connected through an intermediate medium, and may be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0030] In addition, the technical solutions between various embodiments can be combined with each other, but it must be based on the ability of those of ordinary skill in the art to implement. When the combination of technical solutions results in contradictions or cannot be implemented, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection required by the present utility model.

[0031] Embodiment 1

[0032] This embodiment provides a water stop structure for a reverse osmosis membrane element, including a water stop 1 installed on the reverse osmosis membrane element 10 for isolating raw water and concentrated water. As shown in the attached Figure 1 figure, the water stop 1 includes a cylinder body 1.1, a ring-shaped outward expansion part 1.2 provided at the top of the cylinder body, a first sealing lip 1.3 that converges inward provided at the bottom of the outward expansion part, and a skeleton 1.4. The water stop 1 is made of a rubber material coated outside the skeleton 1.4.

[0033] As shown in the attached Figure 2 figure, the skeleton 1.4 includes a collar 1.4.1 provided inside the cylinder body 1.1, a first elastic piece 1.4.2 and a second elastic piece 1.4.3 respectively provided inside the outward expansion part 1.2 and the first sealing lip 1.3. A plurality of the first elastic pieces 1.4.2 and the second elastic pieces 1.4.3 form an integral circular array on the top of the collar 1.4.1; the first elastic piece 1.4.2 and the second elastic piece 1.4.3 are preferably made of spring steel. As shown in the attached Figure 4As shown, this embodiment utilizes the first spring sheet to increase the deformation restoring force of the outward expansion portion, so that the outward expansion portion is tightly attached to the inner wall of the membrane shell 20 to play a sealing role, and the first sealing lip can also contact the inner wall of the membrane shell after the outward expansion portion is deformed to increase the sealing effect. The second spring sheet can effectively prevent the water stop strip from deforming after entering the membrane shell, thereby solving the problem of the first sealing lip possibly slipping out of the outward expansion portion upward.

[0034] Preferably, as attached Figure 1 As shown, the inner diameter of the cylinder 1.1 is smaller than the outer diameter of the reverse osmosis membrane element 10, so that after the cylinder is inserted into the reverse osmosis membrane element, the reverse osmosis membrane element can be tightened; the bottom of the cylinder 1.1 is provided with a chamfer with a diameter larger than the outer diameter of the reverse osmosis membrane element, which facilitates the cylinder to enter the reverse osmosis membrane element.

[0035] Preferably, as attached Figure 1 As shown, the first sealing lip 1.3 is also provided with a plurality of grooves 1.3.1, and the cross section of the grooves 1.3.1 is one of rectangular, trapezoidal, triangular, and arc-shaped. This design can increase the deformation capacity of the surface of the first sealing lip and improve the sealing effect.

[0036] Further, as attached Figure 1 and attached Figure 3 As shown, it also includes a heat shrink sleeve 2, one end of which is sleeved on the cylinder 1.1 and wrapped with a hot air gun. After the water stop is installed in place, the other end of the heat shrink sleeve is also wrapped with a hot air gun. The heat shrink sleeve of this embodiment can seal the cylinder of the water stop and the reverse osmosis membrane element on the one hand, and can also fix the position of the water stop on the reverse osmosis membrane element on the other hand; at the same time, compared with the winding tape, the heat shrink sleeve is more convenient to install.

[0037] Embodiment 2

[0038] Based on the first embodiment, as shown in the attached Figure 1 and attached Figure 3 As shown, in this embodiment, a second sealing lip 1.5 is further provided on the side of the end of the outer expansion part 1.2 away from the cylinder 1.1 and facing the reverse osmosis membrane element 10. After the outer expansion part is deformed, the second sealing lip of this embodiment can contact with the reverse osmosis membrane element to achieve a sealing effect. At the same time, the second sealing lip is squeezed by the water pressure of the raw water to further increase the pressure between the outer expansion part and the membrane shell, thereby improving the sealing performance.

[0039] The above description is only an embodiment of the present invention, and does not limit the patent scope of the present invention. Any equivalent structure or equivalent process transformation made using the contents of the present invention specification, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. A water stop structure for a reverse osmosis membrane element, comprising a water stop installed on the reverse osmosis membrane element; characterized in that: The water stop includes a cylinder body, an annular outward expansion part provided at the top of the cylinder body, a first sealing lip that converges inward provided at the bottom of the outward expansion part, and a skeleton; The skeleton includes a collar provided in the cylinder body, a first elastic sheet provided in the outward expansion part and a second elastic sheet provided in the first sealing lip respectively, and a plurality of the first elastic sheets and the second elastic sheets form an integral circular array on the top of the collar; The water stop is made of a rubber material coated on the outside of the skeleton.

2. The water stop structure of the reverse osmosis membrane element according to claim 1, characterized in that: The inner diameter of the cylinder body is smaller than the outer diameter of the reverse osmosis membrane element, and a chamfer with a diameter larger than the outer diameter of the reverse osmosis membrane element is provided at the bottom of the cylinder body.

3. The water stop structure of the reverse osmosis membrane element according to claim 1, characterized in that: A plurality of circles of grooves are further provided on the first sealing lip, and the cross section of the groove is one of a rectangle, a trapezoid, a triangle, and an arc.

4. The water stop structure of the reverse osmosis membrane element according to claim 1, characterized in that: A second sealing lip is further provided on one side of the end of the outward expansion part away from the cylinder body facing the reverse osmosis membrane element.

5. The water stop structure of the reverse osmosis membrane element according to claim 1, characterized in that: It further includes a heat shrinkable sleeve. One end of the heat shrinkable sleeve is sleeved on the cylinder body, and the cylinder body is wrapped by a hot air gun. After the water stop is installed in place, the other end of the heat shrinkable sleeve is also wrapped around the reverse osmosis membrane element by a hot air gun.

6. The water stop structure of the reverse osmosis membrane element according to claim 1, characterized in that: Both the first elastic sheet and the second elastic sheet are made of spring steel.

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