Sampling device and leak detection method for membrane modules

Abstract

The application relates to a sampling device of a membrane assembly and a leakage detection method. The sampling device of the membrane assembly comprises a liquid output pipe, a first joint assembly and a second joint assembly. The position of the liquid output pipe extending into the inside of the water production output pipe is adjusted so that the end of the liquid output pipe can be moved from the water inlet end to the water production end of the membrane assembly along the water production direction of the membrane assembly, thereby sequentially sampling the water production at the positions of each central pipe and each membrane element and conveying the water production to different detection containers through a sampling valve for conductivity detection. According to the detection result of the conductivity, it is determined whether the corresponding central pipe or membrane element has leakage, that is, the membrane assembly does not need to be disassembled, and the detection efficiency can be greatly improved. In addition, the first joint assembly is arranged at the water production end of the membrane assembly and is sleeved outside the liquid output pipe through a first sealing ring, so that the water production at the water production end is prevented from leaking outward through the gap between the liquid output pipe and the wall of the first channel, thereby ensuring good sealing performance.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of leakage of membrane assembly, and particularly relates to a sampling device of membrane assembly and a leakage detection method. BACKGROUND

[0002] In a water production system, a membrane assembly comprises a membrane shell and a plurality of membrane elements arranged in series in the membrane shell. The membrane elements include, but are not limited to, reverse osmosis membranes, nanofiltration membranes or ultrafiltration membranes. The water production pipes of two adjacent membrane elements are connected by a center pipe and combined to form a water production output pipe. During system operation, raw water enters the inside of the membrane shell through the water inlet end, is filtered by the plurality of membrane elements, and the water produced by the plurality of membrane elements is combined in the water production output pipe, and finally enters the next membrane shell through the water outlet end of the membrane shell or directly enters the water storage tank.

[0003] During system operation, the performance of a certain membrane element or a certain number of membrane elements may be degraded due to various factors, the water production conductivity is increased, and the water production is unqualified. When this situation occurs, the total water production conductivity of all membrane elements in the membrane shell can be measured by sampling the water through the sampling valve at the water outlet end of the membrane shell. When the water production conductivity is high, it indicates that a certain membrane element or a certain number of membrane elements in the membrane shell have salt leakage, but it cannot be determined which one. In order to make the final water production conductivity qualified, the membrane element with salt leakage needs to be replaced. At this time, the membrane shell with salt leakage needs to be opened, all membrane elements in the membrane shell need to be taken out, and the performance of each membrane element needs to be detected. In this way, the specific membrane element with salt leakage can be detected, but the workload is large, and a lot of manpower, material resources and time are consumed. At present, there is also an operation mode of directly sending a liquid sampling pipe into different positions in the membrane shell and sampling at different positions. However, during the sampling process, either leakage is easy to occur or assembly operation is difficult, which is not convenient for assembly. SUMMARY

[0004] The present application provides a sampling device of membrane assembly and a leakage detection method to solve one or more technical problems in the prior art.

[0005] The technical scheme is as follows: a sampling device of a membrane module, comprising: a liquid output pipe, one end of the liquid output pipe penetrating into the inside of a water production output pipe of the membrane module through a water production end of the membrane module; a first joint assembly, the first joint assembly being used for being connected with the water production end, the first joint assembly being provided with a first channel corresponding to the water production end, the liquid output pipe extending outwards through the first channel, and a first sealing ring being arranged on the wall of the first channel and sleeving the outside of the liquid output pipe; and a second joint assembly, the second joint assembly being fixedly connected with the other end of the liquid output pipe, and the second joint assembly being used for being connected with a sampling valve; wherein the second joint assembly can drive the liquid output pipe to move, so as to adjust the position of the liquid output pipe penetrating into the inside of the water production output pipe.

[0006] The sampling device of the membrane module is simple and reliable in dismounting operation on the membrane module when used for detecting the leakage performance of the membrane module; after the sampling device is arranged on the membrane module, raw water is introduced from the water inlet end of the membrane module, the raw water enters the inside of the membrane shell and is filtered through each membrane element to obtain water production; the second joint assembly drives the liquid output pipe to move, the position of the liquid output pipe penetrating into the inside of the water production output pipe is adjusted, the end of the liquid output pipe can move from the water inlet end to the water production end along the water production direction of the membrane module, so that the water production at the positions of each center pipe and each membrane element can be sampled in sequence and transported to different detection containers through the sampling valve to detect the electric conductivity, and whether the corresponding center pipe or membrane element has leakage can be judged according to the detection result of the electric conductivity, that is, the detection efficiency can be greatly improved without dismounting the membrane module; in addition, the first joint assembly is arranged at the water production end of the membrane module and the first sealing ring is sleeved outside the liquid output pipe, so that the water production at the water production end can be prevented from leaking outwards through the gap between the liquid output pipe and the wall of the first channel, thereby ensuring good sealing performance.

[0007] In one of the embodiments, the first joint assembly comprises a base, the base being used for detachably connecting with the water production end; the first channel is formed on the base; the wall of the first channel is formed with a mounting groove, and the first sealing ring is arranged in the mounting groove.

[0008] In one of the embodiments, the first joint assembly further comprises a pressing piece which is detachably arranged on the base; the mounting groove extends along the axis direction of the first channel from the end surface of the base which is away from the water production end; and the pressing piece is located on the end surface of the base which is away from the water production end and abuts against the first sealing ring.

[0009] In one embodiment, the pressure member includes a pressure plate and a sleeve connected to the pressure plate; the pressure plate is disposed around the liquid output pipe and located on the end face of the base away from the water production end, and the pressure plate abuts against the first sealing ring; the sleeve is detachably fitted onto the outside of the base.

[0010] In one embodiment, the outer wall of the base is provided with a first thread, and the inner wall of the sleeve is provided with a second thread that matches the first thread. The sleeve is detachably fitted onto the outside of the base; or, the base is detachably connected to the pressing member by fasteners.

[0011] In one embodiment, there are at least two first sealing rings; at least two first sealing rings are arranged sequentially along the axial direction of the first channel.

[0012] In one embodiment, the first sealing ring is a silicone ring or a rubber ring; the first sealing ring is an O-ring.

[0013] In one embodiment, the base is provided with a second chuck corresponding to the first chuck at the water production end; the first chuck and the second chuck are detachably connected.

[0014] In one embodiment, the second connector assembly includes a quick-connect fitting; one end of the quick-connect fitting is fixedly connected to the other end of the liquid output pipe, and the quick-connect fitting is connected to the sampling valve.

[0015] In one embodiment, the quick-connect fitting has at least one elastic clamping member on its wall, and the liquid output pipe is inserted into the quick-connect fitting and clamped and engaged with the elastic clamping member; the second connector assembly also includes a connecting pipe fitting connected to the quick-connect fitting, and the quick-connect fitting is connected to the sampling valve through the connecting pipe fitting.

[0016] A method for detecting leakage in a membrane module, employing the sampling device for the membrane module, includes the following steps:

[0017] Step S10: Assemble the sampling device of the membrane module onto the membrane module;

[0018] Step S20: Raw water is introduced from the inlet end of the membrane module. After entering the membrane shell, the raw water is filtered by each membrane element to obtain product water.

[0019] Step S30: Drive the liquid output pipe to move through the second connector assembly, so that the end of the liquid output pipe gradually moves from the water inlet end of the membrane module to the water production end. During the movement of the end of the liquid output pipe, the water production at the location of each central pipe and each membrane element is sampled simultaneously.

[0020] Step S40: The sampled product water is transported to different testing containers through the sampling valve for conductivity testing. Based on the conductivity test results, it is determined whether there is leakage in the corresponding central tube and membrane element.

[0021] The above-mentioned method for detecting leakage of membrane modules does not require disassembly and assembly of the membrane modules, which can greatly improve the detection efficiency. In addition, since the first connector assembly is installed at the water production end of the membrane module and is fitted outside the liquid output pipe with the first sealing ring, the water production at the water production end is prevented from leaking outward through the gap between the liquid output pipe and the wall of the first channel, thereby ensuring good sealing performance. Attached Figure Description

[0022] The accompanying drawings, which form part of this application, are used to provide a further understanding of the invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an improper limitation of the invention.

[0023] To more clearly illustrate the technical solutions in the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0024] Figure 1 This is a schematic diagram of the sampling device for a membrane module according to an embodiment of the present invention;

[0025] Figure 2 This is a schematic diagram of the structure of a sampling device for a membrane module installed on a membrane module according to an embodiment of the present invention.

[0026] Figure 3 for Figure 2 A magnified structural diagram at point A.

[0027] 110. Membrane module; 111. Membrane housing; 112. Membrane element; 1121. Permeate pipe; 113. Central pipe; 114. Permeate end; 1141. First chuck; 115. Inlet end; 116. Permeate outlet pipe; 117. Sampling valve; 1171. Third chuck;

[0028] 210. Liquid output pipe; 220. First connector assembly; 221. Base; 2211. Mounting groove; 2212. Second chuck; 2213. Second sealing ring; 222. Pressing element; 2221. Pressing plate; 2222. Sleeve; 230. Second connector assembly; 231. Quick-connect fitting; 232. Butt fitting; 2321. Fourth chuck; 240. First sealing ring. Detailed Implementation

[0029] To make the above-mentioned objects, features, and advantages of the present invention more apparent and understandable, specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a thorough understanding of the present invention. However, the present invention can be practiced in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0030] Please see Figure 2 , Figure 2 A schematic diagram of a sampling device for a membrane module according to an embodiment of the present invention is shown, mounted on a membrane module 110. In one embodiment, the membrane module 110 includes a membrane housing 111 and a plurality of membrane elements 112 arranged in series within the membrane housing 111. The membrane elements 112 include, but are not limited to, reverse osmosis membranes, nanofiltration membranes, or ultrafiltration membranes. The permeate pipes 1121 of two adjacent membrane elements 112 are connected by a central pipe 113 and combined to form a permeate outlet pipe 116. During system operation, raw water enters the interior of the membrane housing 111 through the inlet end 115, is filtered by the plurality of membrane elements 112, and the permeate from the plurality of membrane elements 112 converges into the permeate outlet pipe 116, and finally enters the next section of the membrane housing 111 or directly into the water storage tank through the permeate end 114 of the membrane housing 111.

[0031] See Figures 1 to 3 , Figure 1 A schematic diagram of a sampling device for a membrane module according to an embodiment of the present invention is shown. Figure 3 It shows Figure 2 An enlarged structural diagram at point A. An embodiment of the present invention provides a sampling device for a membrane module, comprising: a liquid output pipe 210, a first connector assembly 220, and a second connector assembly 230. One end of the liquid output pipe 210 passes through the permeate end 114 of the membrane module 110 and extends into the permeate output pipe 116 of the membrane module 110. The first connector assembly 220 is used to connect to the permeate end 114 and has a first channel (not shown) corresponding to and communicating with the permeate end 114. The liquid output pipe 210 extends outward through the first channel, and a first sealing ring 240 is provided on the wall of the first channel and fitted onto the outside of the liquid output pipe 210. The second connector assembly 230 is fixedly connected to the other end of the liquid output pipe 210 and is also used to connect to a sampling valve 117. The second connector assembly 230 can drive the liquid output pipe 210 to move, thereby adjusting the position of the liquid output pipe 210 extending into the permeate output pipe 116.

[0032] When the sampling device described above is used to test the leakage performance of the membrane module 110, one end of the liquid output pipe 210 passes through the permeate end 114 of the membrane module 110 and extends into the permeate output pipe 116 of the membrane module 110. The first connector assembly 220 is connected to the permeate end 114 of the membrane module 110, and the second connector assembly 230 is connected to the sampling valve 117. This makes the installation and removal of the sampling device on the membrane module 110 relatively simple and reliable. After the sampling device is installed on the membrane module 110, raw water is introduced from the inlet end 115 of the membrane module 110. After entering the membrane housing 111, the raw water is filtered by each membrane element 112 to obtain permeate water. The second connector assembly 230 drives the liquid output pipe 210 to move, adjusting the position of the liquid output pipe 210 extending into the permeate output pipe 116, so that the liquid output... The end of the tube 210 can move from the inlet end 115 to the product end 114 of the membrane module 110 along the water production direction, thereby allowing sequential sampling of the product water at the locations of each central tube 113 and each membrane element 112. The samples are then transported to different testing containers (not shown in the figure) via the sampling valve 117 for conductivity testing. Based on the conductivity test results, it can be determined whether there is leakage in the corresponding central tube 113 or membrane element 112. This eliminates the need to disassemble the membrane module 110, greatly improving testing efficiency. Furthermore, since the first connector assembly 220 is installed at the product end 114 of the membrane module 110 and is fitted over the liquid output tube 210 via the first sealing ring 240, leakage of the product water at the product end 114 through the gap between the liquid output tube 210 and the wall of the first channel is prevented, thus ensuring good sealing performance.

[0033] See Figure 1 and Figure 3 In one embodiment, the first connector assembly 220 includes a base 221. The base 221 is detachably connected to the water production end 114. A first channel is formed on the base 221. A mounting groove 2211 is formed on the wall of the first channel. A first sealing ring 240 is disposed in the mounting groove 2211. Thus, by connecting the base 221 to the water production end 114 and sealing it to the outside of the liquid output pipe 210 by the first sealing ring 240, leakage of water from the water production end 114 through the gap between the liquid output pipe 210 and the wall of the first channel can be prevented, thereby ensuring good sealing performance.

[0034] See Figure 1 and Figure 3In one embodiment, the first connector assembly 220 further includes a pressure member 222 detachably disposed on the base 221. The mounting groove 2211 extends along the axis of the first channel from the end face of the base 221 away from the water production end 114. The pressure member 222 is located on the end face of the base 221 away from the water production end 114 and abuts against the first sealing ring 240. Thus, during the assembly of the sampling device, for example, the first sealing ring 240 is first installed in the mounting groove 2211, and then the pressure member 222 is installed on the base 221. During the process of fixing the pressure member 222 to the base 221, it simultaneously abuts against the first sealing ring 240. The first sealing ring 240 is deformed by the compressive force, thereby ensuring tight contact between the first sealing ring 240 and the outer wall of the liquid output pipe 210, achieving good sealing performance. Simultaneously, the disassembly and assembly of the sampling device are relatively convenient.

[0035] Of course, as an optional solution, the mounting groove 2211 is not limited to being set on the end face of the base 221 away from the water production end 114, but can also be set around the middle part of the first channel, for example. In this case, there is no need to configure the pressing member 222 for pressing the first sealing ring 240, but the first sealing ring 240 can be directly installed inside the mounting groove 2211.

[0036] See Figure 1 and Figure 3 In one embodiment, the pressure member 222 includes a pressure plate 2221 and a sleeve 2222 connected to the pressure plate 2221. The pressure plate 2221 is disposed around the liquid output pipe 210 and located on the end face of the base 221 away from the water production end 114, and the pressure plate 2221 abuts against the first sealing ring 240. The sleeve 2222 is detachably fitted onto the outside of the base 221.

[0037] It should be noted that the "pressure plate 2221" can be "part of the sleeve 2222", meaning that the "pressure plate 2221" and "other parts of the sleeve 2222" are integrally molded; or it can be a separate component that can be separated from "other parts of the sleeve 2222", meaning that the "pressure plate 2221" can be manufactured independently and then combined with "other parts of the sleeve 2222" to form a whole. For example... Figure 2 As shown, in one embodiment, the "pressure plate 2221" is integrally molded as part of the "sleeve 2222".

[0038] See Figure 1 and Figure 3In one embodiment, the outer wall of the base 221 is provided with a first thread, and the inner wall of the sleeve 2222 is provided with a second thread that matches the first thread. The sleeve 2222 is detachably fitted onto the outside of the base 221. Thus, by rotating the sleeve 2222, the position of the pressing member 222 on the base 221 can be adjusted, thereby adjusting the degree of compression of the pressing member 222 on the first sealing ring 240, and correspondingly adjusting the sealing performance between the first connector assembly 220 and the liquid output pipe 210. Specifically, the greater the pressing force of the pressing member 222 on the first sealing ring 240, the greater the deformation of the first sealing ring 240, and the better the sealing performance between the first connector assembly 220 and the liquid output pipe 210.

[0039] Of course, as an alternative, the sleeve 2222 can also be detachably mounted on the outer wall of the base 221 by means of, for example, snap-fit.

[0040] Of course, as an optional solution, the base 221 can be detachably connected to the pressing member 222 via fasteners. It should be noted that the fasteners include, but are not limited to, snap-fit ​​components, bolts, screws, pins, and rivets.

[0041] See Figure 1 and Figure 3 In one embodiment, there are at least two first sealing rings 240. The at least two first sealing rings 240 are sequentially arranged along the axial direction of the first channel. Thus, the more first sealing rings 240 there are, the better the sealing performance between the first connector assembly 220 and the liquid output pipe 210 will be.

[0042] Of course, the first sealing ring 240 can also be other quantities, such as one, three, five, etc., which are not limited here and can be determined according to actual needs.

[0043] See Figure 1 and Figure 3 In one embodiment, the first sealing ring 240 may be, but is not limited to, a silicone ring, a rubber ring, or a sealing ring made of other elastic materials.

[0044] In one embodiment, the first sealing ring 240 includes, but is not limited to, an O-ring. When an O-ring is used, it provides better sealing performance.

[0045] See Figure 1 and Figure 3 In one embodiment, the base 221 is provided with a second chuck 2212 corresponding to the first chuck 1141 of the water production end 114. The first chuck 1141 and the second chuck 2212 are detachably connected.

[0046] Specifically, a second sealing ring 2213 is provided between the first chuck 1141 and the second chuck 2212.

[0047] The second sealing ring 2213 may be, but is not limited to, a silicone ring, a rubber ring, or a sealing ring made of other elastic materials. Furthermore, the second sealing ring 2213 may be, but is not limited to, an O-ring. When an O-ring is used, it provides better sealing performance.

[0048] See Figure 1 and Figure 3 In one embodiment, the second connector assembly 230 includes a quick-connect fitting 231. One end of the quick-connect fitting 231 is fixedly connected to the other end of the liquid output pipe 210, and the quick-connect fitting 231 is connected to the sampling valve 117. Thus, using the quick-connect fitting 231 facilitates assembly with the liquid output pipe 210, making the assembly operation quick and convenient, and ensuring a secure connection with the liquid output pipe 210 that is not easily loosened.

[0049] See Figure 1 and Figure 3 In one embodiment, the quick-connect fitting 231 has at least one elastic clamping member (not shown in the figure) on its wall. The liquid output pipe 210 is inserted into the quick-connect fitting 231 and clamped and engaged with the elastic clamping member. The second connector assembly 230 also includes a connecting fitting 232 connected to the quick-connect fitting 231. Optionally, the quick-connect fitting 231 may be screwed onto the connecting fitting 232, and the quick-connect fitting 231 may also be fixedly fitted onto the connecting fitting 232 in other ways. This is not limited here and can be set according to actual needs.

[0050] Furthermore, the quick-connect fitting 231 is connected to the sampling valve 117 via the connecting fitting 232. Specifically, the connecting fitting 232 is provided with a fourth chuck 2321 corresponding to the third chuck 1171 of the sampling valve 117, and the fourth chuck 2321 is detachably connected to the third chuck 1171.

[0051] More specifically, a third sealing ring (not shown in the figure) is provided between the fourth chuck 2321 and the third chuck 1171. Similarly, the third sealing ring may be, but is not limited to, a silicone ring, a rubber ring, or a sealing ring made of other elastic materials. Furthermore, the third sealing ring may be, but is not limited to, an O-ring; when an O-ring is used, it provides better sealing performance.

[0052] See Figures 1 to 3 In one embodiment, a method for detecting leakage in a membrane module employs the sampling device of the membrane module described in any of the above embodiments, and includes the following steps:

[0053] Step S10: Assemble the sampling device of the membrane module onto the membrane module 110;

[0054] Step S20: Raw water is introduced from the inlet 115 of the membrane module 110. After entering the membrane housing 111, the raw water is filtered by each membrane element 112 to obtain product water.

[0055] Step S30: The liquid output pipe 210 is moved by the second connector assembly 230, so that the end of the liquid output pipe 210 gradually moves from the water inlet 115 of the membrane module 110 to the water production end 114. During the movement of the end of the liquid output pipe 210, the water production at the location of each central pipe 113 and each membrane element 112 is sampled simultaneously.

[0056] For example, when it is necessary to sample the permeate from one of the membrane elements 112, the end of the liquid output pipe 210 is moved to the middle of the permeate pipe 1121 of the membrane element 112. In this way, the permeate from the permeate pipe 1121 of the membrane element 112 enters the liquid output pipe 210 through the end of the liquid output pipe 210, and is output to the corresponding detection container through the liquid output pipe 210 and the sampling valve 117. The conductivity of the permeate is then detected in the detection container.

[0057] For example, when it is necessary to sample the produced water of one of the central tubes 113, the end of the liquid output pipe 210 is moved into the central tube 113. In this way, the produced water of the central tube 113 enters the liquid output pipe 210 through the end of the liquid output pipe 210, and is output to the corresponding detection container through the liquid output pipe 210 and the sampling valve 117. The conductivity of the produced water is then detected in the detection container.

[0058] It should be noted that the length of the liquid output pipe 210 is defined as L (e.g., Figure 1 As shown, the length L of the liquid output pipe 210 is designed according to the length of the permeate output pipe 116 of the membrane module 110, as long as the end of the liquid output pipe 210 can be moved to the position of the first central pipe 113 after the liquid output pipe 210 is inserted into the permeate output pipe 116.

[0059] Step S40: The sampled product water is transported to different testing containers through sampling valve 117 for conductivity testing. Based on the conductivity test results, it is determined whether there is leakage between the corresponding central tube 113 and membrane element 112.

[0060] When the conductivity of the produced water is detected to be greater than the preset value, it indicates that there is leakage in the central tube 113 or membrane element 112 at the sampling location corresponding to the produced water, and timely replacement and maintenance are required; when the conductivity of the produced water is detected to be less than or equal to the preset value, there is no leakage in the central tube 113 or membrane element 112 at the sampling location corresponding to the surface produced water, and the performance is normal.

[0061] The above-described leakage detection method for membrane module 110 does not require disassembly of membrane module 110, which can greatly improve detection efficiency. In addition, since the first connector assembly 220 is installed at the water production end 114 of membrane module 110 and is sleeved on the outside of liquid output pipe 210 through the first sealing ring 240, the water produced at the water production end 114 is prevented from leaking outward through the gap between liquid output pipe 210 and the wall of the first channel, thereby ensuring good sealing performance.

[0062] It should be noted that the "second chuck 2212" can be a "part of the base 221", meaning that the "second chuck 2212" is integrally molded with the "other parts of the base 221"; or it can be a separate component that can be separated from the "other parts of the base 221", meaning that the "second chuck 2212" can be manufactured independently and then combined with the "other parts of the base 221" to form a whole. For example... Figure 1 or Figure 3 As shown, in one embodiment, the "second chuck 2212" is integrally molded as part of the "base 221".

[0063] It should be noted that the "fourth chuck 2321" can be "part of the connecting pipe 232", that is, the "fourth chuck 2321" and "other parts of the connecting pipe 232" are integrally molded; or it can be a separate component that can be separated from "other parts of the connecting pipe 232", that is, the "fourth chuck 2321" can be manufactured independently and then combined with "other parts of the connecting pipe 232" to form a whole. For example... Figure 1 or Figure 3 As shown, in one embodiment, the "fourth chuck 2321" is integrally molded as part of the "connecting pipe 232".

[0064] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0065] The embodiments described above are merely illustrative of several implementations of the present invention, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the invention patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these all fall within the protection scope of the present invention. Therefore, the protection scope of this invention patent should be determined by the appended claims.

[0066] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0067] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0068] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0069] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "over," and "on top" of the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0070] It should be noted that when an element is referred to as being "fixed to" or "set on" another element, it can be directly on the other element or there may be an intervening element. When an element is considered to be "connected to" another element, it can be directly connected to the other element or there may be an intervening element. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only possible implementation.

Claims

1. A sampling device for a membrane module, characterized in that, The sampling device for the membrane module includes: A liquid output pipe, one end of which passes through the water production end of the membrane module and extends into the water production output pipe of the membrane module; A first connector assembly is used to connect to the water production end. The first connector assembly is provided with a first channel corresponding to and communicating with the water production end. The liquid output pipe extends outward through the first channel. A first sealing ring is provided on the wall of the first channel and sleeved on the outside of the liquid output pipe. The second connector assembly is fixedly connected to the other end of the liquid output pipe and is also used to connect to a sampling valve; wherein, the second connector assembly can drive the liquid output pipe to move, so as to adjust the position of the liquid output pipe extending into the product water output pipe; The first connector assembly includes a base for detachable connection to the water production end; a first channel is formed on the base; a mounting groove is formed on the wall of the first channel, and a first sealing ring is disposed in the mounting groove; the first connector assembly further includes a pressing member detachably disposed on the base; the mounting groove extends from the end face of the base away from the water production end along the axial direction of the first channel; the pressing member is located on the end face of the base away from the water production end and abuts against the first sealing ring; The pressure-blocking component includes a pressure plate and a sleeve connected to the pressure plate; the pressure plate is arranged around the liquid output pipe and located on the end face of the base away from the water production end, and the pressure plate abuts against the first sealing ring; the sleeve is detachably fitted onto the outside of the base; The outer wall of the base is provided with a first thread, and the inner wall of the sleeve is provided with a second thread that matches the first thread. The sleeve is detachably fitted onto the outside of the base; or, the base is detachably connected to the pressing member by fasteners.

2. The sampling device for the membrane module according to claim 1, characterized in that, There are at least two first sealing rings; at least two first sealing rings are arranged sequentially along the axial direction of the first channel.

3. The sampling device for the membrane module according to claim 1, characterized in that, The first sealing ring is a silicone ring or a rubber ring; the first sealing ring is an O-ring.

4. The sampling device for the membrane module according to claim 1, characterized in that, The base is provided with a second chuck that corresponds to the first chuck at the water production end; the first chuck and the second chuck are detachably connected.

5. The sampling device for the membrane module according to claim 4, characterized in that, A second sealing ring is provided between the first chuck and the second chuck.

6. The sampling device for the membrane module according to claim 5, characterized in that, The second sealing ring is a silicone ring or a rubber ring; the second sealing ring is an O-ring.

7. The sampling device for the membrane module according to claim 1, characterized in that, The second connector assembly includes a quick-connect fitting; one end of the quick-connect fitting is fixedly connected to the other end of the liquid output pipe, and the quick-connect fitting is connected to the sampling valve.

8. The sampling device for the membrane module according to claim 7, characterized in that, The quick-connect fitting has at least one elastic clamping member on its wall, and the liquid output tube is inserted into the quick-connect fitting and clamped and engaged with the elastic clamping member; the second connector assembly also includes a connecting pipe fitting connected to the quick-connect fitting, and the quick-connect fitting is connected to the sampling valve through the connecting pipe fitting.

9. The sampling device for the membrane module according to claim 8, characterized in that, The connecting pipe fitting is provided with a fourth chuck corresponding to the third chuck of the sampling valve, and the fourth chuck is detachably connected to the third chuck.

10. The sampling device for the membrane module according to claim 9, characterized in that, A third sealing ring is provided between the fourth chuck and the third chuck.

11. A method for detecting leakage in a membrane module, characterized in that, The sampling device for the membrane module as described in any one of claims 1 to 10 includes the following steps: Step S10: Assemble the sampling device of the membrane module onto the membrane module; Step S20: Raw water is introduced from the inlet end of the membrane module. After entering the membrane shell, the raw water is filtered by each membrane element to obtain product water. Step S30: Drive the liquid output pipe to move through the second connector assembly, so that the end of the liquid output pipe gradually moves from the water inlet end of the membrane module to the water production end. During the movement of the end of the liquid output pipe, the water production at the location of each central pipe and each membrane element is sampled simultaneously. Step S40: The sampled product water is transported to different testing containers through the sampling valve for conductivity testing. Based on the conductivity test results, it is determined whether there is leakage in the corresponding central tube and membrane element.

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