STRO membrane element, STRO membrane assembly and water treatment equipment

Abstract

The utility model discloses an STRO membrane element, an STRO membrane component and water treatment equipment. The STRO membrane element comprises a central pipe, a water inlet pipe and a water outlet pipe, the STRO membrane is arranged on the outer wall of the central tube; the baffles are arranged on the central pipe in a sleeving manner and are positioned on two sides of the STRO membrane; a limiting ring groove is formed in the peripheral surface of the central pipe, and the limiting check ring is embedded in the limiting ring groove and abuts against the baffle so as to limit the baffle to move in the direction away from the STRO membrane. According to the utility model, the limiting check ring is additionally arranged to limit the baffle plate, so that when the STRO membrane element is impacted by high-pressure liquid for a long time, the baffle plate, the STRO membrane and the center pipe are not easy to lose efficacy by mucilage glue, the axial movement of the STRO membrane element is reduced, and the service life of the STRO membrane component is prolonged. In addition, the STRO membrane component sealing structure is improved, so that the pressure-resistant grade of the system is improved, the service life of a sealing element is prolonged, the problem of sealing permeation of the system is solved, and the later maintenance cost of the system is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of sewage treatment, and more specifically, to a STRO membrane element, a STRO membrane module and a water treatment device. Background Art

[0002] Surface water is easily polluted by industrial wastewater and domestic sewage, and the difficulty of using surface water is gradually increasing. In view of this background, the membrane separation technology has emerged. As an advantageous separation product with both the high flux of traditional spiral wound reverse osmosis membranes and the high pressure resistance and anti-pollution characteristics of DTRO (Disk Tube Reverse Osmosis), STRO (spacer tube reverse osmosis) is widely used in the fields of industrial wastewater treatment containing salt, landfill leachate treatment, etc.

[0003] To ensure the high-pressure operation environment and high-flux characteristics of the STRO membrane, it is necessary to ensure the stable performance of the STRO membrane element and the good sealing of the STRO membrane module. However, during the operation of the STRO membrane module system, the STRO membrane element is continuously impacted by high-pressure liquid for a long time, which is likely to cause damage to the membrane element, seriously affecting the product performance and causing economic losses.

[0004] Therefore, how to increase the service life of the STRO membrane module has become a technical problem that needs to be solved urgently by those skilled in the art. Summary of the Utility Model

[0005] In view of this, the purpose of the present utility model is to provide a STRO membrane element to increase the service life of the STRO membrane module.

[0006] Another purpose of the present utility model is to provide a STRO membrane module and a water treatment device including the above-mentioned STRO membrane element.

[0007] To achieve the above purpose, the present utility model provides the following technical solutions:

[0008] A STRO membrane element, comprising:

[0009] A central tube;

[0010] A STRO membrane disposed on the outer wall of the central tube;

[0011] A baffle sleeved on the central tube and located on both sides of the STRO membrane;

[0012] A limit retaining ring, a limit ring groove is provided on the outer peripheral surface of the central tube, the limit retaining ring is embedded in the limit ring groove and abuts against the baffle to limit the axial movement of the STRO membrane element.

[0013] Optionally, in the above-mentioned STRO membrane element, an embedded ring groove is provided on the end surface of the baffle plate facing away from the STRO membrane, and the limit retaining ring is embedded in the embedded ring groove.

[0014] Optionally, in the above-mentioned STRO membrane element, the end surface of the baffle plate facing away from the STRO membrane and the end surface of the limit retaining ring facing away from the STRO membrane are located in the same plane; and / or,

[0015] The embedded ring groove is a groove with a gradually changing width, and in the direction from near the STRO membrane to far from the STRO membrane, the width of the embedded ring groove gradually increases.

[0016] Optionally, in the above-mentioned STRO membrane element, the baffle plate has a number of reinforcing ribs arranged at intervals, and at least the reinforcing ribs on the baffle plate on the liquid inlet side of the STRO membrane element extend along the curved surface.

[0017] Optionally, in the above-mentioned STRO membrane element, in the direction from near the central tube to far from the central tube, the flow-through area of the liquid passing holes arranged at intervals on the baffle plate gradually increases.

[0018] Optionally, in the above-mentioned STRO membrane element, in the direction from near the central tube to far from the central tube, the baffle plate has multiple circles of the liquid passing holes, and each circle of the liquid passing holes is arranged around the central tube;

[0019] The flow-through areas of the liquid passing holes in the same circle are the same;

[0020] For any two adjacent circles of the liquid passing holes, the flow-through area of the liquid passing holes near the central tube is smaller than the flow-through area of the liquid passing holes far from the central tube.

[0021] For the STRO membrane element provided by the present invention, a limit retaining ring is added on the basis of the prior art to limit the baffle plate. A limit ring groove is provided on the outer peripheral surface of the central tube, and the limit retaining ring is embedded in the limit ring groove, so that the limit retaining ring cannot move axially along the central tube. The limit retaining ring protrudes radially from the central tube, so that it can abut against the baffle plate, thereby achieving the effect of restricting the baffle plate from moving away from the STRO membrane, and then restricting the axial movement of the STRO membrane element. The present invention can ensure that when the STRO membrane element is subjected to long-term impact of high-pressure liquid, it is not easy to cause the adhesive failure of the baffle plate, the STRO membrane and the central tube, reduce the movement of the STRO membrane element, and increase the service life of the STRO membrane module.

[0022] An STRO membrane module, comprising:

[0023] STRO membrane accessories;

[0024] The STRO membrane element is the STRO membrane element described in any one of the above.

[0025] Optionally, in the above STRO membrane module, the STRO membrane accessory includes:

[0026] A feed water distributor and a concentrate water distributor. The feed water distributor and the concentrate water distributor are respectively arranged at both ends of the STRO membrane element, are hermetically connected to the central pipe, and both the feed water distributor and the concentrate water distributor are provided with abutting limit parts. The abutting limit parts of the feed water distributor and the concentrate water distributor respectively abut on the limit retaining rings at the corresponding ends of the STRO membrane element;

[0027] A feed water pipe and a concentrate water pipe. The feed water pipe is arranged on the feed water distributor, and the concentrate water pipe is arranged on the concentrate water distributor;

[0028] A product water shaft sleeve is arranged on the feed water distributor and is communicated with the central pipe;

[0029] A membrane housing. The feed water distributor, the concentrate water distributor and the STRO membrane element are all hermetically arranged in the membrane housing.

[0030] Optionally, in the above STRO membrane module, sealing grooves are provided on the end faces of the feed water distributor and the concentrate water distributor facing the central pipe, axial sealing rings are arranged in the sealing grooves, and the axial sealing rings abut on the end face of the central pipe.

[0031] The STRO membrane module provided by the present invention has all the technical effects of the above STRO membrane element due to having the above STRO membrane element, and will not be elaborated herein.

[0032] A water treatment device includes the STRO membrane module described in any one of the above.

[0033] The water treatment device provided by the present invention has all the technical effects of the above STRO membrane module due to having the above STRO membrane module, and will not be elaborated herein. Description of the Drawings

[0034] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the following drawings are only some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0035] Figure 1 It is a cross-sectional view of the STRO membrane module in the prior art;

[0036] Figure 2 is a cross-sectional view of an STRO membrane element in the prior art;

[0037] Figure 3 is a structural schematic diagram of a baffle in the prior art;

[0038] Figure 4 is a partial cross-sectional view of an STRO membrane module in the prior art;

[0039] Figure 5 is Figure 4 a partial enlarged view of A in

[0040] Figure 6 is a cross-sectional view of an STRO membrane module disclosed in an embodiment of the present invention;

[0041] Figure 7 is a cross-sectional view of an STRO membrane element disclosed in an embodiment of the present invention;

[0042] Figure 8 is a structural schematic diagram of a baffle disclosed in an embodiment of the present invention;

[0043] Figure 9 is a partial cross-sectional view of an STRO membrane module disclosed in an embodiment of the present invention;

[0044] Figure 10 is Figure 9 a partial enlarged view of B in

[0045] The meanings of the various reference numerals in the figures are as follows:

[0046] 101 - STRO membrane; 102 - membrane housing; 103 - central tube; 104 - water production bushing; 105 - liquid inlet pipe; 106 - concentrated liquid pipe; 107 - baffle; 1071 - reinforcing rib; 1072 - embedded ring groove; 1073 - liquid passing hole; 108 - liquid inlet end water distributor; 109 - concentrated liquid end water distributor; 110 - radial sealing ring; 111 - limit retaining ring; 112 - axial sealing ring. Detailed implementation manners

[0047] The core of the present invention lies in providing an STRO membrane element to increase the service life of the STRO membrane module.

[0048] Another core of the present invention lies in providing an STRO membrane module and a water treatment device including the above-mentioned STRO membrane element.

[0049] Hereinafter, embodiments will be described with reference to the accompanying drawings. In addition, the embodiments shown below do not limit the utility model described in the claims in any way. Additionally, all the contents of the configurations shown in the following embodiments are not necessarily essential for the solution of the utility model described in the claims. It should be noted that for ease of description, only the parts related to the utility model are shown in the drawings. Without conflict, the embodiments and features in the embodiments of the present utility model can be combined with each other.

[0050] As Figure 1 shown, the STRO membrane module in the prior art includes a feed water distributor 108, a concentrate water distributor 109, STRO membrane elements, a feed pipe 105, a concentrate pipe 106, a product water shaft sleeve 104, and a membrane housing 102. Among them, the STRO membrane element is the core component of the STRO membrane module and generally includes a central tube 103, an STRO membrane 101, and a baffle 107.

[0051] During the use of the STRO membrane module, the liquid to be treated enters the STRO membrane element through the feed pipe 105, and the liquid to be treated is separated into a concentrate and a permeate through the STRO membrane 101. The concentrate is discharged through the concentrate pipe 106, and the permeate enters the central tube 103 through the holes on the side wall of the central tube 103 and is discharged through the product water shaft sleeve 104.

[0052] As Figure 2 and Figure 3 shown, both the STRO membrane 101 and the baffles 107 at both ends of the STRO membrane 101 are fixed to the central tube 103 by bonding. During the treatment of the liquid to be treated, the STRO membrane 101 will continuously be impacted by high-pressure liquid. As the use time increases, it will inevitably cause the adhesive between the baffle 107 and the STRO membrane 101 and the central tube 103 to fail. After the bonding fails, this will cause the baffle 107 and the STRO membrane 101 to move axially along the central tube 103 under the impact of the high-pressure liquid, seriously damaging the STRO membrane 101 and ultimately reducing the service life of the STRO membrane module.

[0053] Based on the above problems, the embodiments of the present utility model disclose an STRO membrane element, in which the baffle 107 and the STRO membrane 101 of the STRO membrane element have a relatively reliable fixing effect, avoiding the axial movement caused by the bonding failure and ultimately affecting the service life of the STRO membrane module.

[0054] As Figure 6 and Figure 7 shown, the STRO membrane element disclosed in the embodiments of the present utility model includes a central tube 103, an STRO membrane 101, a baffle 107, and a limit retaining ring 111.

[0055] Among them, the STRO membrane 101 is arranged on the outer wall of the central tube 103 and is usually fixed to the outer wall of the central tube 103 by bonding. The baffle 107 has a central hole and is sleeved on the central tube 103 through its central hole and is located on both sides of the STRO membrane 101. The baffles 107 arranged at both ends of the STRO membrane 101 have a limiting and protecting function for the STRO membrane 101, so that the STRO membrane element has a higher strength.

[0056] A limiting ring groove is provided on the outer peripheral surface of the central tube 103, and the limiting retaining ring 111 is embedded in the limiting ring groove. It should be noted that usually, the inner diameter of the limiting retaining ring 111 should be adapted to the bottom diameter of the limiting ring groove to avoid radial shaking of the limiting retaining ring 111 after installation. Based on this, the depth of the limiting ring groove should consider the installation of the limiting retaining ring 111, that is, the depth of the limiting ring groove should not be too deep. If it is too deep, the difference between the inner diameter of the limiting retaining ring 111 and the bottom diameter of the central tube 103 will be large, and the limiting retaining ring 111 needs to be inserted from the end of the central tube 103. If the size difference between the two is large, it will inevitably lead to difficult installation of the limiting retaining ring 111. If the radial shaking of the limiting retaining ring 111 after installation is not considered, the depth of the limiting ring groove may not be too concerned as long as it can ensure that the limiting retaining ring 111 can be installed and can form a limit with the side wall of the limiting ring groove.

[0057] After the limiting retaining ring 111 is installed on the central tube 103, it can abut against the baffle 107 to limit the movement of the baffle 107 away from the STRO membrane 101, and then the axial movement of the STRO membrane element can be restricted, that is, the limiting retaining ring 111 is located on the side of the baffle 107 facing away from the STRO membrane 101. It should be noted that limiting retaining rings 111 need to be configured for the baffles 107 at both ends of the STRO membrane 101 to limit the two baffles 107 and prevent the baffles 107 and the STRO membrane 101 from moving axially in both directions along the central tube 103 under the impact of high-pressure liquid.

[0058] In this embodiment, the material of the limiting retaining ring 111 is not limited, but in order to facilitate installation, a plastic with a certain elastic deformation ability can be selected as the material of the limiting retaining ring 111; in addition, plastic also has capabilities such as anti-corrosion and anti-rust that metals do not have, and is more suitable for application in water treatment equipment.

[0059] In summary, the STRO membrane element disclosed in the embodiments of the present utility model adds a limiting retaining ring 111 for limiting the baffle 107 on the basis of the prior art. In order to realize the axial fixation of the limiting retaining ring 111 on the central tube 103, a limiting ring groove is provided on the outer peripheral surface of the central tube 103, and the limiting retaining ring 111 is embedded in the limiting ring groove, so that the limiting retaining ring 111 cannot move axially along the central tube 103. The present utility model can ensure that when the STRO membrane element is subjected to long-term impact of high-pressure liquid, it is not easy to cause the adhesion failure of the baffle 107 and the STRO membrane to the central tube 103, reduce the crosstalk of the STRO membrane element, and increase the service life of the STRO membrane module.

[0060] As Figure 7 and Figure 8 shown, in order to prevent the limiting retaining ring 111 from shaking radially along the central tube 103, in this embodiment, an embedding ring groove 1072 is provided on the end face of the baffle 107 facing away from the STRO membrane 101, and the limiting retaining ring 111 is embedded in the embedding ring groove 1072. That is, in this embodiment, the inner ring of the limiting retaining ring 111 is embedded in the limiting ring groove of the central tube 103, and the outer ring of the limiting retaining ring 111 is embedded in the embedding ring groove 1072 of the baffle 107. The embedding ring groove 1072 has a radial limiting effect on the limiting retaining ring 111, thereby improving the installation stability of the limiting retaining ring 111.

[0061] Furthermore, the end face of the baffle 107 facing away from the STRO membrane 101 and the end face of the limiting retaining ring 111 facing away from the STRO membrane 101 are located in the same plane. With this setting, after the limiting retaining ring 111 is embedded in the embedding ring groove 1072, the outer side surface of the limiting retaining ring 111 can be coplanar with the outer side surface of the baffle 107 to obtain a better flatness effect. It should be noted that the outer side surface of the limiting retaining ring 111 can also be designed to be inside or outside the outer side surface of the baffle 107.

[0062] The embedding ring groove 1072 is a groove with a gradually changing width, and the width of the embedding ring groove 1072 gradually increases from the direction close to the STRO membrane 101 to the direction away from the STRO membrane 101. It should be noted that the shape of the limiting retaining ring 111 matches the shape of the embedding ring groove 1072. Designing the embedding ring groove 1072 to have a gradually increasing width from the direction close to the STRO membrane 101 to the direction away from the STRO membrane 101 can make the thickness of one side of the limiting retaining ring 111 inserted into the embedding ring groove 1072 thinner, and such a setting can facilitate the embedding of the limiting retaining ring 111. At the same time, when the baffle 107 is subjected to a force in the direction away from the STRO membrane 101, in addition to the front end face of the limiting retaining ring 111 providing a limiting function, the outer ring of the limiting retaining ring 111 has a limiting function because it is a conical surface and can bear axial force.

[0063] As Figure 3As shown, in the prior art, a plurality of reinforcing ribs 1071 are arranged at intervals on the baffle 107, and the space between two adjacent reinforcing ribs 1071 is in a hollow state, so that the liquid to be processed can enter the area of the STRO membrane 101 through the baffle 107 on the liquid inlet side, and the concentrated liquid after treatment can be discharged from the area of the STRO membrane 101 through the baffle 107 on the concentrated liquid side.

[0064] In the prior art, the reinforcing ribs 1071 extend radially along a straight line along the baffle 107, and the high-pressure liquid in the liquid inlet pipe 105 has a large impact on the end face of the STRO membrane 101, and it is easy to cause damage to the STRO membrane 101 after a long time.

[0065] Based on this, in a specific embodiment of the present invention, as Figure 8 shown, in the present invention, at least the reinforcing ribs 1071 of the baffle 107 on the liquid inlet side are designed to extend along a curved surface. There are a plurality of reinforcing ribs 1071 on the baffle 107, and they are arranged at intervals. Further, the reinforcing ribs 1071 on the baffle 107 can be evenly arranged on the circumference centered on the axis of the baffle 107. In this embodiment, the reinforcing ribs 1071 are designed to extend in a curve, so that when subjected to high-pressure impact, due to the extension direction being a curved surface, the directions of the forces received at different positions are different, which can effectively disperse the liquid pressure, thereby reducing the possibility of local pressure concentration and reducing the risk of damage to the STRO membrane element. Such a setting helps to improve the durability and stability of the STRO membrane element.

[0066] It should be noted that the reinforcing ribs 1071 of both the baffle 107 on the liquid inlet side and the baffle 107 on the concentrated liquid side can be designed to extend along a curved surface.

[0067] The baffle 107 needs to be able to allow liquid to pass through, so a liquid passing area needs to be provided on its end face. The liquid passing area can be Figure 3 the overall hollow state shown. That is, the area between any two adjacent reinforcing ribs 1071 is designed to be in a hollow state for liquid to pass through.

[0068] In a specific embodiment of the present invention, as Figure 8 shown, in this embodiment, the traditional hollow liquid passing method is changed. A plurality of liquid passing holes 1073 are provided in the liquid passing area, and the liquid passes through the baffle 107 through the liquid passing holes 1073.

[0069] In this embodiment, the area between any two adjacent reinforcing ribs 1071 can also be understood as the liquid passing area, and a plurality of liquid passing holes 1073 are provided in each liquid passing area. And in the direction from the center tube 103 to away from the center tube 103, that is, along the radial direction, the flow-through area of the liquid passing holes 1073 arranged at intervals on the baffle 107 gradually increases. In this embodiment, the flow-through area of the liquid passing holes 1073 closer to the axis of the baffle 107 is smaller.

[0070] In this embodiment, the liquid passing holes 1073 on the baffle 107 are designed with a gradient hole. Since the treatment area of the STRO membrane 101 is smaller closer to the central tube 103, the liquid passing holes 1073 on the baffle 107 for this area are designed to be smaller; correspondingly, the farther away from the central tube 103, the larger the treatment area of the STRO membrane 101, and the liquid passing holes 1073 on the baffle 107 for this area are designed to be larger. With this setting, it can effectively promote the high-pressure liquid to uniformly pass through the STRO membrane 101, optimize the liquid flow, make the liquid more uniform when passing through the STRO membrane 101, reduce the pressure concentration in the local area, reduce the impact and pressure on the STRO membrane 101, improve the durability of the STRO membrane element, and is beneficial to reducing the equipment maintenance cost.

[0071] Further, in the direction from close to the central tube 103 to far from the central tube 103, the baffle 107 has multiple circles of liquid passing holes 1073, and the liquid passing holes 1073 in each circle are uniformly arranged around the circumferential center of the central tube 103, that is, the axes of the liquid passing holes 1073 in each circle are the same.

[0072] The flow-through areas of the liquid passing holes 1073 in the same circle are the same, that is, each circle has multiple liquid passing holes 1073, and the flow-through areas of the respective liquid passing holes 1073 in the same circle are the same. It should be noted that in this embodiment, the number of liquid passing holes 1073 in each circle is the same. Figure 8 In the shown scheme, 36 liquid passing holes 1073 are provided in each circle. Of course, those skilled in the art can also design the number of liquid passing holes 1073 in each circle to be different according to requirements.

[0073] For any two adjacent circles of liquid passing holes 1073, the flow-through area of the liquid passing holes 1073 close to the central tube 103 is smaller than that of the liquid passing holes 1073 far from the central tube 103. That is, along the radial direction of the baffle 107, the closer the liquid passing holes 1073 are to the central tube 103, the smaller their flow-through area, and the closer the liquid passing holes 1073 are to the outer peripheral surface, the larger their flow-through area.

[0074] As Figure 6 shown, the embodiment of the present utility model also discloses a STRO membrane module, which includes a STRO membrane accessory and a STRO membrane element. Among them, the STRO membrane accessory is other necessary components of the STRO membrane module except the STRO membrane element. The STRO membrane element is the STRO membrane element disclosed in the above embodiment. The STRO membrane module disclosed in the embodiment of the present utility model has all the technical effects of the above STRO membrane element due to having the above STRO membrane element, and will not be elaborated herein.

[0075] Further, the STRO membrane accessory may include a feed water distributor 108, a concentrate water distributor 109, a feed pipe 105, a concentrate pipe 106, a permeate bushing 104, and a membrane housing 102.

[0076] Among them, the feed water distributor 108 and the concentrate water distributor 109 are respectively arranged at both ends of the STRO membrane element and are hermetically connected to the central pipe 103. The feed pipe 105 is arranged on the feed water distributor 108, and the concentrate pipe 106 is arranged on the concentrate water distributor 109. The feed liquid to be treated enters the STRO membrane module through the feed pipe 105, and the feed liquid is evenly distributed by the feed water distributor 108 and then enters the STRO membrane element for treatment. The treated concentrate is discharged through the concentrate pipe 106.

[0077] In order to further improve the stability and reliability and prevent the limit retaining ring 111 from falling off, in this embodiment, the feed water distributor 108 and the concentrate water distributor 109 are both provided with abutting limit portions. The abutting limit portions of the feed water distributor 108 and the concentrate water distributor 109 respectively abut against the limit retaining rings 111 at the corresponding ends of the STRO membrane element. With such a setting, when the baffle 107 at the feed end is subjected to a force in the direction away from the STRO membrane 101, it will be blocked by the limit retaining ring 111 at the feed end. In addition to being limited by the limit ring groove, the limit retaining ring 111 is also limited by the abutting limit portion of the feed water distributor 108, thereby preventing the limit retaining ring 111 at the feed end from falling off and improving the product reliability.

[0078] When the baffle 107 at the concentrate end is subjected to a force in the direction away from the STRO membrane 101, it will be blocked by the limit retaining ring 111 at the concentrate end. In addition to being limited by the limit ring groove, the limit retaining ring 111 is also limited by the abutting limit portion of the concentrate water distributor 109, thereby preventing the limit retaining ring 111 at the concentrate end from falling off and improving the product reliability.

[0079] The permeate bushing 104 is arranged on the feed water distributor 108 and is communicated with the central pipe 103. The treated permeate is discharged from the permeate bushing 104. In order to compress the STRO membrane element, a central shaft 113 is usually inserted into the central pipe 103. Both ends of the central shaft 113 have threads, and the STRO membrane element is compressed by cooperating with nuts. The permeate bushing 104 can also be sleeved on the central shaft 113 and is compressed by nuts. It should be noted that gaps need to be provided between the central shaft 113 and the central pipe 103 and the permeate bushing 104 to ensure the flow of the permeate.

[0080] The feed water distributor 108, the concentrate water distributor 109, and the STRO membrane element are all hermetically arranged in the membrane housing 102. The membrane housing 102 serves as the outer shell of the STRO membrane module and is used to protect the components inside it.

[0081] As Figure 4 and Figure 5 shown, there is a radial sealing ring 110 between the liquid inlet distributor 108 and the central tube 103 to prevent the feed liquid from entering the permeate. Due to the mechanical fit between the liquid inlet distributor 108 and the central tube 103, there is a certain gap between the central tube 103 and the liquid inlet distributor 108 instead of close contact. During the operation of the STRO membrane module, the feed liquid has a relatively high pressure, which will continuously exert pressure on the radial sealing ring 110. Therefore, the radial sealing ring 110 will be squeezed and deformed into the gap between the central tube 103 and the liquid inlet distributor 108 (as Figure 5 shown). Over time, the structure of the radial sealing ring 110 will be damaged, resulting in the damage of the radial sealing ring 110. The sealing situation between the concentrate distributor 109 and the central tube 103 is the same, and will not be elaborated here.

[0082] Based on the above problems, in a specific embodiment of the present utility model, the sealing method between the liquid distributors (liquid inlet distributor 108, concentrate distributor 109) and the central tube 103 is improved to avoid the problem that the sealing ring between the two is damaged due to pressure.

[0083] Specifically, as Figure 9 and Figure 10 shown, sealing grooves are provided on the end faces of the liquid inlet distributor 108 and the concentrate distributor 109 facing the central tube 103, and axial sealing rings 112 are arranged in the sealing grooves, and the axial sealing rings 112 abut against the end face of the central tube 103. In this embodiment, the sealing ring between the liquid inlet distributor 108 and the concentrate distributor 109 and the central tube 103 is changed from the original radial seal to an axial seal. The influence of deformation on the axial sealing ring 112 is relatively smaller than that of the radial sealing ring, which can effectively reduce the problems of aging and damage of the sealing ring and improve its pressure resistance level.

[0084] The embodiment of the present utility model also discloses a water treatment device, including the STRO membrane module disclosed in the above embodiment. The water treatment device provided by the present utility model has all the technical effects of the above STRO membrane module due to having the above STRO membrane module, and will not be elaborated here.

[0085] As shown in this application and the claims, unless the context clearly indicates an exceptional situation, words such as "a", "one", "kind" and / or "the" are not specifically singular, but may also include plural. Generally speaking, the terms "comprising" and "including" only indicate the inclusion of the clearly identified steps and elements, and these steps and elements do not constitute an exclusive list, and the method or device may also include other steps or elements. Elements defined by the statement "including one..." do not exclude the existence of other identical elements in the process, method, commodity or device including the elements.

[0086] In the description of this application, unless otherwise clearly defined, terms such as "setting", "installing", "connecting", etc. should be understood in a broad sense, and those skilled in the art can reasonably determine the specific meanings of the above terms in this application in combination with the specific content of the technical solution.

[0087] In this specification, the various embodiments are described in a progressive manner. Each embodiment focuses on the differences from other embodiments, and the same or similar parts between the various embodiments can be referred to each other.

[0088] Specific examples are used herein to elaborate on the principles and implementation manners of the present utility model. The description of the above embodiments is only used to help understand the method and its core idea of the present utility model. It should be noted that for those of ordinary skill in the art, without departing from the principle of the present utility model, several improvements and modifications can be made to the present utility model, and these improvements and modifications also fall within the protection scope of the claims of the present utility model.

Claims

1. A STRO membrane element, characterized in that: include: Central tube (103); A STRO membrane (101) is disposed on the outer wall of the central tube (103); Baffles (107) are sleeved on the central tube (103) and located on both sides of the STRO membrane (101); A limiting retaining ring (111), wherein a limiting ring groove is provided on the outer peripheral surface of the central tube (103), and the limiting retaining ring (111) is embedded in the limiting ring groove and abuts against the baffle (107) to limit the axial movement of the STRO membrane element.

2. The STRO membrane element according to claim 1, characterized in that: An embedded annular groove (1072) is provided on the end surface of the baffle (107) facing away from the STRO film (101), and the limit retaining ring (111) is embedded in the embedded annular groove (1072).

3. The STRO membrane element according to claim 2, characterized in that: The end surface of the baffle (107) facing away from the STRO film (101) and the end surface of the limit retaining ring (111) facing away from the STRO film (101) are located in the same plane; and / or, The embedded annular groove (1072) is a groove with a gradually changing groove width, and the groove width of the embedded annular groove (1072) gradually increases in a direction from close to the STRO membrane (101) to far away from the STRO membrane (101).

4. The STRO membrane element according to any one of claims 1 to 3, characterized in that: The baffle plate (107) has a plurality of reinforcing ribs (1071) arranged at intervals, and at least the reinforcing ribs (1071) on the baffle plate (107) on the liquid inlet side of the STRO membrane element extend along a curve.

5. The STRO membrane element according to any one of claims 1 to 3, characterized in that: In a direction from close to the central tube (103) to far away from the central tube (103), the flow area of ​​the liquid holes (1073) arranged at intervals on the baffle (107) gradually increases.

6. The STRO membrane element according to claim 5, characterized in that: In a direction from close to the central tube (103) to far from the central tube (103), the baffle (107) has a plurality of circles of liquid-passing holes (1073), and each circle of the liquid-passing holes (1073) is arranged around the central tube (103); The flow areas of the liquid holes (1073) in the same circle are the same; In any two adjacent circles of the liquid-passing holes (1073), the flow area of ​​the liquid-passing holes (1073) close to the central tube (103) is smaller than the flow area of ​​the liquid-passing holes (1073) far from the central tube (103).

7. A STRO membrane module, characterized in that: include: STRO membrane accessories; The STRO membrane element is a STRO membrane element as described in any one of claims 1 to 6.

8. The STRO membrane module according to claim 7, characterized in that The STRO membrane auxiliary components include: A liquid inlet end water distributor (108) and a concentrate end water distributor (109), wherein the liquid inlet end water distributor (108) and the concentrate end water distributor (109) are respectively arranged at two ends of the STRO membrane element and are sealedly connected to the central tube (103), and both the liquid inlet end water distributor (108) and the concentrate end water distributor (109) are provided with abutment limiting portions, and the abutment limiting portions of the liquid inlet end water distributor (108) and the concentrate end water distributor (109) are respectively abutted against limiting retaining rings (111) at corresponding ends of the STRO membrane element; A liquid inlet pipe (105) and a concentrate pipe (106), wherein the liquid inlet pipe (105) is arranged at the liquid inlet end water distributor (108), and the concentrate pipe (106) is arranged at the concentrate end water distributor (109); A water-producing shaft sleeve (104) is arranged on the liquid inlet end water distributor (108) and is in communication with the central tube (103); The membrane shell (102), the liquid inlet end water distributor (108), the concentrate end water distributor (109) and the STRO membrane element are all sealed and arranged in the membrane shell (102).

9. The STRO membrane module according to claim 8, characterized in that The liquid inlet end water distributor (108) and the concentrated liquid end water distributor (109) are provided with sealing grooves on their end surfaces facing the central tube (103), and an axial sealing ring (112) is provided in the sealing groove, and the axial sealing ring (112) abuts against the end surface of the central tube (103).

10. A water treatment device, characterized in that: Comprising a STRO membrane module as described in any one of claims 7-9.

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