Filter

Abstract

The utility model discloses a filter, aiming at solving the technical problem that the internal sealing of a filter assembly fails. Comprising a shell assembly and a filter element assembly, a second pressing mechanism is arranged in the shell assembly, an inner pull rod assembly of the second pressing mechanism comprises an inner pull rod, an inner pull rod first end axial pulling structure and an inner pull rod second end axial pulling structure, and the inner pull rod first end axial pulling structure comprises a jacking sleeve, an inner pull rod first end locking nut and a jacking sleeve anti-torsion structure. The locking nut at the first end of the inner pull rod is assembled on the outer side of the shell assembly and connected with a corresponding screw section on the inner pull rod in a threaded fit mode or connected with a threaded hole in the shell assembly in a threaded fit mode, and the anti-torsion structure of the jacking sleeve comprises an isolation component pressed between the jacking sleeve and the locking nut at the first end of the inner pull rod. And the isolating component is easy to transmit axial force applied to the isolating component by the locking nut at the first end of the inner pull rod, but is not easy to transmit torsional force applied to the isolating component by the locking nut at the first end of the inner pull rod.

Description

Technical Field

[0001] The present disclosure relates to filters, and in particular to disc-tube membrane filters, including disc-tube reverse osmosis filters (DTRO) or disc-tube nanofiltration membrane filters (DTNF) and the like. Background Art

[0002] Disc-Tube membrane filters, such as disc-tube reverse osmosis filters (DTRO) or disc-tube nanofiltration membrane filters (DTNF), have been widely used in the field of water treatment due to their advantages such as high water production rate. The basic structure of the disc-tube membrane filter is: its shell assembly constitutes a pressure vessel held by a clamping mechanism on the shell assembly, and its filter element assembly is installed in the pressure vessel in a compressed manner. The filter element assembly includes a plurality of disc-shaped cross-flow filter units, which are stacked and compressed along the compression direction of the clamping mechanism. Each disc-shaped cross-flow filter unit adopts a combination of a guide disc and a diaphragm, and the guide disc promotes the flow of liquid on the diaphragm. Of course, the shell assembly, the filter element assembly and each disc-shaped cross-flow filter unit are also provided with corresponding flow channels to realize the flow of raw liquid (liquid to be filtered), concentrated liquid (liquid that does not pass through the filter material such as the membrane during filtration) and clear liquid (liquid that passes through the filter material such as the membrane during filtration).

[0003] Typically, the shell assembly includes a tube shell, a first end cover component, a second end cover component, and a clamping mechanism; the first end cover component is installed at the first end of the tube shell; the second end cover component is installed at the second end of the tube shell; the clamping mechanism clamps the first end cover component and the second end cover component at both ends of the tube shell along the axial direction of the tube shell. The clamping mechanism specifically includes a plurality of outer tie rod components distributed at intervals in the circumferential direction, each outer tie rod component includes an outer tie rod, an axial tie structure at the first end of the outer tie rod, and an axial tie structure at the second end of the outer tie rod; the outer tie rod is located on the outside of the tube shell and extends along the axial direction of the tube shell; the axial tie structure at the first end of the outer tie rod is arranged at the first end of the outer tie rod and the first end cover component is tied to the outer tie rod; the axial tie structure at the second end of the outer tie rod is arranged at the second end of the outer tie rod and the second end cover component is tied to the outer tie rod.

[0004] The above-mentioned disc-tube membrane filters generally have the following technical problems: First, the clamping mechanism needs to install the corresponding end cover component after the filter element assembly is installed into the shell assembly, and then the shell assembly is clamped. Before the shell assembly is clamped by the clamping mechanism, the filter element assembly is always in a fluffy state. Therefore, the guide plate and the diaphragm in the filter element assembly are prone to displacement, resulting in poor assembly or sealing failure inside the filter element assembly after assembly. Second, after the clamping mechanism clamps the shell assembly, the filter element assembly is also clamped by the shell assembly. However, during the operation of the disc-tube membrane filter, the filter element assembly will shrink plastically as a whole (usually occurs in the early stage of the operation of the disc-tube membrane filter), causing the clamping force applied by the shell assembly on the filter element assembly to gradually decrease, which is easy to cause sealing failure inside the filter element assembly. Utility Model Content

[0005] The purpose of the present disclosure is to provide an improved filter to solve the technical problem of improving the internal sealing failure of the filter element assembly.

[0006] In a first aspect, a filter is provided, comprising:

[0007] A shell assembly, wherein the shell assembly constitutes a pressure vessel held by a first clamping mechanism on the shell assembly and is respectively provided with a first raw liquid inlet, a first concentrated liquid outlet, and a first clear liquid outlet;

[0008] A filter element assembly, which is installed in the pressure vessel in a compressed manner and is respectively provided with a second raw liquid inlet, a second concentrated liquid outlet and a second clear liquid outlet;

[0009] Wherein, the first stock liquid inlet is connected with the second stock liquid inlet to form a stock liquid passage, the first concentrated liquid outlet is connected with the second concentrated liquid outlet to form a concentrated liquid passage, and the first clear liquid outlet is connected with the second clear liquid outlet to form a clear liquid passage;

[0010] The shell assembly is provided with a second clamping mechanism, the second clamping mechanism comprises an inner pull rod assembly, and the inner pull rod assembly comprises:

[0011] An inner pull rod, the inner pull rod being inserted into the filter element assembly along a direction parallel to the clamping direction of the first clamping mechanism;

[0012] An axial tie structure at the first end of the inner tie rod, wherein the axial tie structure at the first end of the inner tie rod is arranged at the first end of the inner tie rod and is tied to the first end of the filter element assembly under the action of the inner tie rod;

[0013] An axially-connected structure at the second end of the inner tie rod, wherein the axially-connected structure at the second end of the inner tie rod is arranged at the second end of the inner tie rod and connects the second end of the shell assembly under the action of the inner tie rod;

[0014] Wherein, the axial tension structure at the first end of the inner pull rod comprises a top tightening sleeve, a first locking member and a second locking member, and the first locking member and the second locking member are the same locking member or different locking members;

[0015] The tightening sleeve is sleeved on the inner tie rod, the inner wall of the tightening sleeve is axially slidably matched with the inner tie rod, and the outer wall of the tightening sleeve is axially slidably and sealingly matched with the shell assembly;

[0016] The first locking member is assembled on the inner tie rod and is used to axially lock the top sleeve between the first end of the filter element assembly and the first locking member, so that the filter element assembly is pre-compressed by the top sleeve. At this time, the part of the shell assembly used to achieve the axial sliding sealing cooperation with the top sleeve can pass through the first locking member and be sleeved on the top sleeve;

[0017] The second locking member is assembled on the outside of the shell assembly and is used to axially lock the top tightening sleeve between the first end of the filter element assembly and the second locking member, so that the filter element assembly is additionally compressed by the top tightening sleeve.

[0018] The filter of the first aspect mentioned above creatively sets a second clamping mechanism in the shell assembly. During the filter assembly process, the filter element assembly can be pre-compressed by the first locking piece and the top tightening sleeve, and then the part of the shell assembly used to achieve axial sliding sealing cooperation with the top tightening piece can be passed through the first locking piece and mounted on the top tightening piece. In this way, it is possible to effectively avoid the problem of displacement of parts in the filter element assembly causing poor filter assembly or sealing failure inside the filter element assembly after assembly; during the operation of the filter, the filter element assembly is further compressed by the second locking piece and the top tightening sleeve to compensate for the pressure loss caused by the overall plastic shrinkage of the filter element assembly and maintain the sealing performance of the related parts in the filter element assembly. In this way, the technical problem of improving the internal sealing failure of the filter element assembly is solved.

[0019] In a second aspect, a filter is provided, comprising:

[0020] A shell assembly, wherein the shell assembly constitutes a pressure vessel held by a first clamping mechanism on the shell assembly and is respectively provided with a first raw liquid inlet, a first concentrated liquid outlet, and a first clear liquid outlet;

[0021] A filter element assembly, which is installed in the pressure vessel in a compressed manner and is respectively provided with a second raw liquid inlet, a second concentrated liquid outlet and a second clear liquid outlet;

[0022] Wherein, the first stock liquid inlet is connected with the second stock liquid inlet to form a stock liquid passage, the first concentrated liquid outlet is connected with the second concentrated liquid outlet to form a concentrated liquid passage, and the first clear liquid outlet is connected with the second clear liquid outlet to form a clear liquid passage;

[0023] The shell assembly is provided with a second clamping mechanism, the second clamping mechanism comprises an inner pull rod assembly, and the inner pull rod assembly comprises:

[0024] An inner pull rod, the inner pull rod being inserted into the filter element assembly along a direction parallel to the clamping direction of the first clamping mechanism;

[0025] An axial tie structure at the first end of the inner tie rod, wherein the axial tie structure at the first end of the inner tie rod is arranged at the first end of the inner tie rod and is tied to the first end of the filter element assembly under the action of the inner tie rod;

[0026] An axially-connected structure at the second end of the inner tie rod, wherein the axially-connected structure at the second end of the inner tie rod is arranged at the second end of the inner tie rod and connects the second end of the shell assembly under the action of the inner tie rod;

[0027] The axial tension structure at the first end of the inner tie rod comprises a tightening sleeve, a locking nut at the first end of the inner tie rod and an anti-twist structure of the tightening sleeve;

[0028] The tightening sleeve is sleeved on the inner tie rod, the inner wall of the tightening sleeve is axially slidably matched with the inner tie rod, and the outer wall of the tightening sleeve is axially slidably and sealingly matched with the shell assembly;

[0029] The locking nut at the first end of the inner tie rod is assembled on the outer side of the shell assembly and threadedly adapted to the corresponding screw segment on the inner tie rod or threadedly adapted to the threaded hole on the shell assembly. The locking nut at the first end of the inner tie rod is used to axially lock the top sleeve between the first end of the filter element assembly and the locking nut at the first end of the inner tie rod, so that the filter element assembly is pressed by the top sleeve;

[0030] The anti-twist structure of the top tightening sleeve is used to prevent the top tightening sleeve from twisting when the top tightening sleeve is driven by the locking nut at the first end of the inner pull rod, and the anti-twist structure of the top tightening sleeve includes a rotation-stopping structure arranged between the top tightening sleeve and the inner pull rod;

[0031] The axial tie structure at the second end of the inner tie rod comprises a locking nut at the second end of the inner tie rod, and the locking nut at the second end of the inner tie rod is threadedly adapted to be connected with a screw segment on the inner tie rod extending out of the second end of the shell assembly and axially matched with the second end of the shell assembly;

[0032] An inner tie rod anti-rotation structure is disposed on the outer surface of the shell component and can be further detachably mounted on the outer surface of the shell component when a locking nut at the second end of the inner tie rod is installed.

[0033] The filter of the second aspect mentioned above creatively sets a second clamping mechanism in the shell assembly. During the operation of the filter, the filter element assembly is further clamped by the locking nut at the first end of the inner tie rod and the top tightening sleeve to compensate for the pressure loss caused by the overall plastic contraction of the filter element assembly and maintain the sealing performance of the related parts in the filter element assembly. Thus, the technical problem of improving the internal sealing failure of the filter element assembly is solved. In the process of tightening the locking nut at the first end of the inner tie rod, the top tightening sleeve is subjected to the torsional force transmitted by the locking nut at the first end of the inner tie rod, so that the top tightening sleeve and the filter element assembly are prone to torsional deformation. In this regard, since a rotation-stopping structure is provided between the top tightening sleeve and the inner tie rod, and an inner tie rod rotation-stopping structure is provided on the outer surface of the shell assembly, the torsional force transmitted by the locking nut at the first end of the inner tie rod received by the top tightening sleeve is sequentially transmitted to the shell assembly through the rotation-stopping structure, the inner tie rod and the inner tie rod rotation-stopping structure, so that the top tightening sleeve and the filter element assembly can be prevented from torsional deformation and affecting the normal use of the filter.

[0034] A third aspect provides a filter, comprising:

[0035] A shell assembly, wherein the shell assembly constitutes a pressure vessel held by a first clamping mechanism on the shell assembly and is respectively provided with a first raw liquid inlet, a first concentrated liquid outlet, and a first clear liquid outlet;

[0036] A filter element assembly, which is installed in the pressure vessel in a compressed manner and is respectively provided with a second raw liquid inlet, a second concentrated liquid outlet and a second clear liquid outlet;

[0037] Wherein, the first stock liquid inlet is connected with the second stock liquid inlet to form a stock liquid passage, the first concentrated liquid outlet is connected with the second concentrated liquid outlet to form a concentrated liquid passage, and the first clear liquid outlet is connected with the second clear liquid outlet to form a clear liquid passage;

[0038] The shell assembly is provided with a second clamping mechanism, the second clamping mechanism comprises an inner pull rod assembly, and the inner pull rod assembly comprises:

[0039] An inner pull rod, the inner pull rod being inserted into the filter element assembly along a direction parallel to the clamping direction of the first clamping mechanism;

[0040] An axial tie structure at the first end of the inner tie rod, wherein the axial tie structure at the first end of the inner tie rod is arranged at the first end of the inner tie rod and is tied to the first end of the filter element assembly under the action of the inner tie rod;

[0041] An axially-connected structure at the second end of the inner tie rod, wherein the axially-connected structure at the second end of the inner tie rod is arranged at the second end of the inner tie rod and connects the second end of the shell assembly under the action of the inner tie rod;

[0042] The axial tension structure at the first end of the inner tie rod comprises a tightening sleeve, a locking nut at the first end of the inner tie rod and an anti-twist structure of the tightening sleeve;

[0043] The tightening sleeve is sleeved on the inner tie rod, the inner wall of the tightening sleeve is axially slidably matched with the inner tie rod, and the outer wall of the tightening sleeve is axially slidably and sealingly matched with the shell assembly;

[0044] The locking nut at the first end of the inner tie rod is assembled on the outer side of the shell assembly and threadedly adapted to the corresponding screw segment on the inner tie rod or threadedly adapted to the threaded hole on the shell assembly. The locking nut at the first end of the inner tie rod is used to axially lock the top sleeve between the first end of the filter element assembly and the locking nut at the first end of the inner tie rod, so that the filter element assembly is pressed by the top sleeve;

[0045] The anti-twist structure of the tightening sleeve is used to prevent the tightening sleeve from twisting when the tightening sleeve is driven by the locking nut at the first end of the inner pull rod. The anti-twist structure of the tightening sleeve includes an isolation component that is compressed between the tightening sleeve and the locking nut at the first end of the inner pull rod. The isolation component is easy to transmit the axial force applied by the locking nut at the first end of the inner pull rod to the isolation component, but is not easy to transmit the torsional force applied by the locking nut at the first end of the inner pull rod to the isolation component.

[0046] The filter of the third aspect above creatively sets a second clamping mechanism in the shell assembly. During the operation of the filter, the filter element assembly is further clamped by the locking nut at the first end of the inner tie rod and the top tightening sleeve to compensate for the pressure loss caused by the overall plastic shrinkage of the filter element assembly and maintain the sealing performance of the related parts in the filter element assembly. Thus, the technical problem of improving the failure of the internal seal of the filter element assembly is solved. In the process of tightening the locking nut at the first end of the inner tie rod, if the top tightening sleeve is subjected to the torsional force transmitted by the locking nut at the first end of the inner tie rod, the top tightening sleeve and the filter element assembly are prone to torsional deformation. In this regard, since an isolation component is provided between the top tightening sleeve and the locking nut at the first end of the inner tie rod, the isolation component is easy to transmit the axial force applied by the locking nut at the first end of the inner tie rod to the isolation component, but it is not easy to transmit the torsional force applied by the locking nut at the first end of the inner tie rod to the isolation component. Therefore, the torsional force transmitted by the locking nut at the first end of the inner tie rod to the top tightening sleeve is blocked by the isolation component, which can prevent the top tightening sleeve and the filter element assembly from torsional deformation and affect the normal use of the filter.

[0047] A fourth aspect provides a filter, including:

[0048] A shell assembly, wherein the shell assembly constitutes a pressure vessel held by a first clamping mechanism on the shell assembly and is respectively provided with a first raw liquid inlet, a first concentrated liquid outlet, and a first clear liquid outlet;

[0049] A filter element assembly, which is installed in the pressure vessel in a compressed manner and is respectively provided with a second raw liquid inlet, a second concentrated liquid outlet and a second clear liquid outlet;

[0050] Wherein, the first stock liquid inlet is connected with the second stock liquid inlet to form a stock liquid passage, the first concentrated liquid outlet is connected with the second concentrated liquid outlet to form a concentrated liquid passage, and the first clear liquid outlet is connected with the second clear liquid outlet to form a clear liquid passage;

[0051] The shell assembly is provided with a second clamping mechanism, the second clamping mechanism comprises an inner pull rod assembly, and the inner pull rod assembly comprises:

[0052] An inner pull rod, the inner pull rod being inserted into the filter element assembly along a direction parallel to the clamping direction of the first clamping mechanism;

[0053] An axial tie structure at the first end of the inner tie rod, wherein the axial tie structure at the first end of the inner tie rod is arranged at the first end of the inner tie rod and is tied to the first end of the filter element assembly under the action of the inner tie rod;

[0054] An axially-connected structure at the second end of the inner tie rod, wherein the axially-connected structure at the second end of the inner tie rod is arranged at the second end of the inner tie rod and connects the second end of the shell assembly under the action of the inner tie rod;

[0055] Wherein, the axial tension structure at the first end of the inner pull rod specifically comprises a tension sleeve and a locking member at the first end of the inner pull rod;

[0056] The tightening sleeve is sleeved on the inner tie rod, the inner wall of the tightening sleeve is axially slidably matched with the inner tie rod, and the outer wall of the tightening sleeve is axially slidably and sealingly matched with the shell assembly;

[0057] The locking piece at the first end of the inner pull rod is assembled on the inner pull rod and is used to axially lock the tightening sleeve between the first end of the filter element assembly and the first locking piece, so that the filter element assembly is pre-tightened by the tightening sleeve. At this time, the part of the shell assembly used to achieve the axial sliding sealing cooperation with the tightening piece can pass through the locking piece at the first end of the inner pull rod and be mounted on the tightening sleeve.

[0058] The filter of the fourth aspect above creatively sets a second clamping mechanism in the shell assembly. During the filter assembly process, the filter element assembly can be pre-compressed by the locking piece at the first end of the inner tie rod and the top tightening sleeve, and then the part of the shell assembly used to achieve axial sliding sealing cooperation with the top tightening piece is passed through the locking piece at the first end of the inner tie rod and sleeved on the top tightening piece. In this way, it is possible to effectively avoid the problem of displacement of parts in the filter element assembly causing poor filter assembly or sealing failure inside the filter element assembly after assembly. Thus, the technical problem of improving the sealing failure inside the filter element assembly is solved.

[0059] A fifth aspect provides a filter, including:

[0060] A shell assembly, wherein the shell assembly constitutes a pressure vessel held by a first clamping mechanism on the shell assembly and is respectively provided with a first raw liquid inlet, a first concentrated liquid outlet, and a first clear liquid outlet;

[0061] A filter element assembly, which is installed in the pressure vessel in a compressed manner and is respectively provided with a second raw liquid inlet, a second concentrated liquid outlet and a second clear liquid outlet;

[0062] Wherein, the first stock liquid inlet is connected with the second stock liquid inlet to form a stock liquid passage, the first concentrated liquid outlet is connected with the second concentrated liquid outlet to form a concentrated liquid passage, and the first clear liquid outlet is connected with the second clear liquid outlet to form a clear liquid passage;

[0063] The shell assembly is provided with a second clamping mechanism, the second clamping mechanism comprises an inner pull rod assembly, and the inner pull rod assembly comprises:

[0064] An inner pull rod, the inner pull rod being inserted into the filter element assembly along a direction parallel to the clamping direction of the first clamping mechanism;

[0065] An axial tie structure at the first end of the inner tie rod, wherein the axial tie structure at the first end of the inner tie rod is arranged at the first end of the inner tie rod and is tied to the first end of the filter element assembly under the action of the inner tie rod;

[0066] An axially-connected structure at the second end of the inner tie rod, wherein the axially-connected structure at the second end of the inner tie rod is arranged at the second end of the inner tie rod and connects the second end of the shell assembly under the action of the inner tie rod;

[0067] The axial tie structure at the first end of the inner tie rod specifically comprises a tightening sleeve and a locking nut at the first end of the inner tie rod;

[0068] The tightening sleeve is sleeved on the inner tie rod, the inner wall of the tightening sleeve is axially slidably matched with the inner tie rod, and the outer wall of the tightening sleeve is axially slidably and sealingly matched with the shell assembly;

[0069] The locking nut at the first end of the inner tie rod is threadedly adapted to the threaded hole on the shell assembly and is used to axially lock the top sleeve between the first end of the filter element assembly and the locking nut at the first end of the inner tie rod, so that the filter element assembly is pressed by the top sleeve;

[0070] A fixing plate is mounted on the outer surface of the shell component, the threaded hole is opened on the fixing plate, and the locking nut at the first end of the inner pull rod is mounted on the outer side of the shell component.

[0071] The filter of the fifth aspect mentioned above creatively arranges a second clamping mechanism in the shell assembly. During the operation of the filter, the filter element assembly is further clamped by the locking nut at the first end of the inner pull rod and the tightening sleeve to compensate for the pressure loss caused by the overall plastic shrinkage of the filter element assembly and maintain the sealing performance of related parts in the filter element assembly. Thereby, the technical problem of improving the internal sealing failure of the filter element assembly is solved. Since the threaded hole is provided on the fixed plate, the locking nut at the first end of the inner pull rod is adapted to the threaded hole through an external thread. Therefore, the diameter of the threaded hole is larger, and the locking nut at the first end of the inner pull rod can generate a stronger axial locking force.

[0072] The present disclosure is further described below in conjunction with the accompanying drawings and specific embodiments. Additional aspects and advantages provided by the present disclosure will be partially given in the following description, partially become apparent from the following description, or be understood through practice. BRIEF DESCRIPTION OF THE DRAWINGS

[0073] The drawings constituting a part of this specification are used to assist in the understanding of the present disclosure. The contents provided in the drawings and their related descriptions in the present disclosure are used to explain the present disclosure but do not constitute improper limitations on the present disclosure.

[0074] Figure 1 This is an appearance diagram of the disc-tube membrane filter of the first embodiment of the present disclosure.

[0075] Figure 2 for Figure 1 A magnified view of the middle A end.

[0076] Figure 3 for Figure 1 Cross-sectional view of end A.

[0077] Figure 4 for Figure 1 Cross-sectional view of the middle B end.

[0078] Figure 5 This is an appearance diagram of the disc-tube membrane filter of the second embodiment of the present disclosure.

[0079] Figure 6 for Figure 5 Cross-sectional view of the middle B end.

[0080] Figure 7 for Figure 5 Cross-sectional view of end A.

[0081] Figure 8 It is a cross-sectional view of the disc-tube membrane filter of the third embodiment of the present disclosure.

[0082] Fig. 9 for Figure 8 Cross-sectional view of end A.

[0083] Fig.10 It is a cross-sectional view of the disc-tube membrane filter of the fourth embodiment of the present disclosure.

[0084] Fig.11 for Fig.10 Cross-sectional view of end A.

[0085] Fig.12 This is an appearance diagram of the disc-tube membrane filter of the fifth embodiment of the present disclosure.

[0086] Fig.13 for Fig.12 Cross-sectional view of end A.

[0087] Fig.14 This is an appearance diagram of the disc-tube membrane filter of the fifth embodiment of the present disclosure.

[0088] Fig.15 for Fig.14 A magnified view of the B end.

[0089] Fig.16 for Fig.14 Cross-sectional view of the middle B end.

[0090] Fig.17 for Fig.14 Cross-sectional view of end A.

[0091] Fig.18 Schematic diagram of the anti-twisting structure of the top tightening sleeve in the disc-tube membrane filter of the sixth embodiment of the present disclosure.

[0092] Fig.19 It is a schematic diagram of the anti-twisting structure of the top tightening sleeve in the disc-tube membrane filter of the fifth embodiment of the present disclosure.

[0093] Marked in the figure are: shell assembly 1, tube shell 11, first end cover component 12, second end cover component 13, first clamping mechanism 14, first raw liquid inlet 15, first concentrated liquid outlet 16, first clear liquid outlet 17, diverter plate 18, first channel 181, second channel 182, filter element assembly 2, guide plate 21, second raw liquid inlet 22, second concentrated liquid outlet 23, second clear liquid outlet 24, first end pressure cover 25 of filter element assembly, inner pull rod 26, liquid inlet hole 261, top tightening sleeve 27, outer boss 271, spring 271, first locking piece 28, second locking piece 29, fixed plate 210, first locking nut 211, second locking nut 212, third locking nut 213, fourth locking nut 214, cushion block 215, top tightening sleeve anti-rotation surface 216. DETAILED DESCRIPTION

[0094] The present disclosure is described clearly and completely below in conjunction with the accompanying drawings. A person of ordinary skill in the art will be able to implement the present disclosure based on these descriptions. Before describing the present disclosure in conjunction with the accompanying drawings, it should be particularly noted that:

[0095] The technical solutions and technical features provided in each section, including the following description, can be combined with each other without conflict. In addition, where possible, these technical solutions, technical features and related combinations can be assigned specific technical themes and protected by relevant patents.

[0096] The embodiments of the present disclosure involved in the following description are generally only a part of the embodiments rather than all the embodiments. Based on these embodiments, all other embodiments obtained by ordinary technicians in this field without making creative work should fall within the scope of patent protection.

[0097] The terms "include", "comprising", "having" and any variations thereof in this disclosure and the corresponding claims and related parts are intended to cover non-exclusive inclusions. Other related terms and units can be reasonably interpreted based on the relevant content provided in this disclosure.

[0098] Disc-Tube membrane filters, such as disc-tube reverse osmosis filters (DTRO) or disc-tube nanofiltration membrane filters (DTNF), have a basic structure that belongs to the prior art and can be found in Chinese patent documents such as publication number CN105903354A.

[0099] Specifically, if Figure 1-Figure 17 As shown, the shell assembly 1 of the disc-tube membrane filter constitutes a pressure vessel held by the first clamping mechanism 14 on the shell assembly 1, and the filter element assembly 2 is installed in the pressure vessel in a compressed manner. The filter element assembly 2 (the filter element assembly 2 is not fully shown in the relevant drawings, and some drawings only show the guide plates 21 at both ends of the filter element assembly 2 and the first end gland 25 of the filter element assembly) includes a plurality of disc-shaped cross-flow filter units, which are stacked and compressed along the compression direction of the first clamping mechanism 14, and each disc-shaped cross-flow filter unit adopts a combination of a guide plate 21 and a membrane, and the guide plate 21 promotes the flow of liquid on the membrane.

[0100] Among them, the shell component 1 is respectively provided with a first raw liquid inlet 15, a first concentrated liquid outlet 16 and a first clear liquid outlet 17; the filter element component 2 is respectively provided with a second raw liquid inlet 22, a second concentrated liquid outlet 23 (arranged on the first end pressure cover 25 of the filter element component) and a second clear liquid outlet 24; the first raw liquid inlet 15 is connected with the second raw liquid inlet 22 to form a raw liquid passage, the first concentrated liquid outlet 16 is connected with the second concentrated liquid outlet 23 to form a concentrated liquid passage, and the first clear liquid outlet 17 is connected with the second clear liquid outlet 24 to form a clear liquid passage.

[0101] Here, "stock liquid" refers to the liquid to be filtered, "concentrated liquid" refers to the liquid that does not pass through the membrane during filtration, and "clear liquid" refers to the liquid that passes through the membrane during filtration. During the use of the disc-tube membrane filter, the stock liquid enters the disc-tube membrane filter from the stock liquid passage and then enters the filter element assembly 2. The concentrated liquid filtered by the filter element assembly 2 is output from the disc-tube membrane filter from the concentrated liquid passage, and the clear liquid filtered by the filter element assembly 2 is output from the disc-tube membrane filter from the clear liquid passage.

[0102] In a specific embodiment, a diverter plate 18 is installed between one end of the filter element assembly 1 and the corresponding end of the shell assembly 2, and the diverter plate 18 and the inner wall of the shell assembly 1 form a drainage gap. The first raw liquid inlet 15 and the second raw liquid inlet 22 are connected through a first channel 181 located in the diverter plate 18 to form a raw liquid passage. The first concentrated liquid outlet 16 and the second concentrated liquid outlet 23 are connected through the drainage gap and the second channel 182 located in the diverter plate to form a concentrated liquid passage. The first clear liquid outlet 17 and the second clear liquid outlet 24 are connected through a third channel located in the diverter plate 18 to form a clear liquid passage.

[0103] The disc-shaped cross-flow filter unit is provided with a raw liquid port, a concentrated liquid port and a clear liquid port. The raw liquid port of any disc-shaped cross-flow filter unit is connected with the concentrated liquid port of the adjacent previous disc-shaped cross-flow filter unit (the specific structure of the guide plate 21 is described in detail in the aforementioned Chinese patent document with publication number CN105903354A. For the specific manner in which the raw liquid port of any disc-shaped cross-flow filter unit is connected with the concentrated liquid port of the adjacent previous disc-shaped cross-flow filter unit and other detailed structures of the filter element assembly 1, reference can be made to the patent document and will not be repeated here). The raw liquid port of the first disc-shaped cross-flow filter unit constitutes the second raw liquid inlet 22, and the concentrated liquid port of the last disc-shaped cross-flow filter unit constitutes the second concentrated liquid outlet 23.

[0104] The clear liquid outlets of these disc-shaped cross-flow filter units are connected to form a clear liquid output channel, and the outlet of the clear liquid output channel constitutes the second clear liquid outlet 24. Generally speaking, a liquid outlet pipe is inserted into the filter element assembly 2 (the inner tie rod 26 described below can serve as the liquid outlet pipe), and the liquid outlet pipe is respectively connected to the clear liquid outlets of these disc-shaped cross-flow filter units to serve as the clear liquid output channel (that is, the inner tie rod is a tubular structure and is respectively connected to the clear liquid outlets of these disc-shaped cross-flow filter units to serve as the clear liquid output channel). A through hole serving as the clear liquid outlet of the disc-shaped cross-flow filter unit is provided on the diaphragm in each disc-shaped cross-flow filter unit, and the through hole is matched with the gap between the above-mentioned liquid outlet pipe so that the clear liquid in the diaphragm penetrates into the matching gap between the diaphragm and the liquid outlet pipe. At the same time, liquid inlet holes 261 are spaced apart on the liquid outlet pipe, so that the clear liquid between the diaphragm and the liquid outlet pipe enters the liquid outlet pipe through these liquid inlet holes 261. The liquid outlet end of the liquid outlet pipe directly passes through the shell assembly 1, so that the first clear liquid outlet 17 and the second clear liquid outlet 24 actually both point to the outlet of the liquid outlet pipe. At this time, the "third channel in the diverter plate 18" actually refers to the hole on the diverter plate 18 that matches the liquid outlet pipe. Usually, the liquid outlet pipe is set at the center of the filter element assembly 2, that is, the central axis of the liquid outlet pipe is coaxial with the central axis of the filter element assembly 2.

[0105] The shell assembly 1 generally comprises a tube shell 11, a first end cover component 12, a second end cover component 13 and a first clamping mechanism 14; the first end cover component 12 is installed at the first end of the tube shell 11; the second end cover component is installed at the second end of the tube shell; the first clamping mechanism 14 respectively clamps the first end cover component 12 and the second end cover component 13 at both ends of the tube shell 11 along the axial direction of the tube shell 11.

[0106] The first clamping mechanism 14 generally includes a plurality of outer tie rod assemblies spaced apart in the circumferential direction, each outer tie rod assembly including an outer tie rod, an axial tie structure at the first end of the outer tie rod, and an axial tie structure at the second end of the outer tie rod; the outer tie rod is located outside the tube shell 11 and extends along the axial direction of the tube shell 11; the axial tie structure at the first end of the outer tie rod is arranged at the first end of the outer tie rod and is tied to the first end cover member 12 under the action of the outer tie rod; the axial tie structure at the second end of the outer tie rod is arranged at the second end of the outer tie rod and is tied to the second end cover member 13 under the action of the outer tie rod. The axial tie structure at the first end of the outer tie rod and the axial tie structure at the second end of the outer tie rod generally use nuts.

[0107] In the past, the first clamping mechanism 14 was required to install the first end cover member 12 after the filter element assembly 2 was installed into the shell assembly 1, and then the shell assembly 1 was clamped. Before the shell assembly 1 was clamped by the first clamping mechanism 14, the filter element assembly 2 was always in a fluffy state. Therefore, when the first end cover member 12 was installed, the guide plate 21 and the diaphragm in the filter element assembly 2 were easily displaced, resulting in poor assembly or sealing failure inside the filter element assembly 2 after assembly. In addition, after the first clamping mechanism clamped the shell assembly 1, the filter element assembly 2 was also clamped by the shell assembly 1. However, during the operation of the disc-tube membrane filter, the filter element assembly 2 will shrink plastically as a whole (usually in the early stage of the operation of the disc-tube membrane filter), causing the clamping force applied by the shell assembly 1 on the filter element assembly 2 to gradually decrease, which is easy to cause the sealing failure inside the filter element assembly 2.

[0108] On the basis of the above-mentioned disc-tube membrane filter, the disc-tube membrane filter of the following embodiment of the present disclosure creatively provides a second pressing mechanism in the shell component 1 .

[0109] Figure 1 This is an appearance diagram of the disc-tube membrane filter of the first embodiment of the present disclosure. Figure 2 for Figure 1 A magnified view of the middle A end. Figure 3 for Figure 1 Cross-sectional view of end A. Figure 4 for Figure 1 Cross-sectional view of the middle B end.

[0110] like Figure 1-Figure 4 As shown, the shell assembly 1 of the disc tube membrane filter of Example 1 is provided with a second clamping mechanism, and the second clamping mechanism includes an inner tie rod assembly, and the inner tie rod assembly includes: an inner tie rod 26, an axial tie structure at the first end of the inner tie rod, and an axial tie structure at the second end of the inner tie rod.

[0111] The inner pull rod 26 is inserted into the filter element assembly 2 along a direction parallel to the clamping direction of the first clamping mechanism 14 .

[0112] Among them, the axial pulling structure of the first end of the inner pull rod is arranged at the first end of the inner pull rod 26 and pulls the first end of the filter element assembly 2 (specifically the end face of the first end pressure cover 25 of the filter element assembly) under the action of the inner pull rod 26.

[0113] The inner tie rod second end axially connecting structure is arranged at the second end of the inner tie rod 26 and connects the second end of the shell assembly 1 (specifically the end face of the second end cover component 13 ) under the action of the inner tie rod 26 .

[0114] The axial tension structure at the first end of the inner tie rod specifically comprises a tightening sleeve 27, a first locking member 28 and a second locking member 29, wherein the first locking member 28 and the second locking member 29 are the same locking member.

[0115] The tightening sleeve 27 is sleeved on the inner tie rod 26 , and the inner wall of the tightening sleeve 27 is axially slidingly matched with the inner tie rod 26 , and the outer wall of the tightening sleeve 27 is axially slidingly and sealingly matched with the shell assembly 1 (specifically the first end cover component 12 ).

[0116] It should be noted that "axial sliding fit" means that the two mating parts can slide axially. "Axial sliding sealing fit" means that the two mating parts can slide axially; and the mating surfaces of the two parts that perform axial sliding fit are also sealed by a sealing structure (such as a sealing ring) so as not to cause leakage of liquid.

[0117] When the liquid does not enter between the inner wall of the top sleeve 27 and the inner tie rod 26 through reasonable design, it is not necessary to seal between the inner wall of the top sleeve 27 and the inner tie rod 26. On the contrary, it is often difficult to avoid setting a sealing structure between the outer wall of the top sleeve 27 and the shell assembly 1. Therefore, "axial sliding sealing fit" can be understood broadly, for example, the sealing structure between the outer wall of the top sleeve 27 and the shell assembly 1 does not have to be limited to being set between the outer wall of the top sleeve 27 and the shell assembly 1.

[0118] The first locking piece 28 is assembled on the inner pull rod 26 and is used to axially lock the top tightening sleeve 27 between the first end of the filter element assembly 2 and the first locking piece 28, so that the filter element assembly 2 is pre-tightened by the top tightening sleeve 27. At this time, the part of the shell assembly 1 used to achieve the axial sliding sealing cooperation with the top tightening piece 27 (specifically the first end cover component 12) can pass through the first locking piece 28 and be mounted on the top tightening piece 27.

[0119] The second locking member 29 is assembled on the outside of the shell assembly 1 and is used to axially lock the pressing sleeve 27 between the first end of the filter element assembly 2 and the second locking member 29 , so that the filter element assembly 2 is additionally compressed by the pressing sleeve 27 .

[0120] During the assembly of the disc-tube membrane filter, the filter element assembly 2 can be pre-tightened by the first locking member 28 and the top tightening sleeve 27, and then the part of the shell assembly 1 used to achieve axial sliding sealing with the top tightening member 27 (specifically, the first end cover member 12) can be passed through the first locking member 28 and mounted on the top tightening member 27 (since the diameter of the first locking member 28 is smaller than the diameter of the top tightening sleeve 27, the first end cover member 12) can be passed through the first locking member 28 and mounted on the top tightening member 27). In this way, it is possible to effectively avoid the problem of poor assembly caused by displacement of parts in the filter element assembly 2 or sealing failure inside the filter element assembly 2 after assembly. After the first end cover member 12 is assembled, during the operation of the disc-tube membrane filter, the filter element assembly 2 can also be additionally tightened by the second locking member 29 and the top tightening sleeve 27 to compensate for the pressure loss caused by the overall plastic shrinkage of the filter element assembly 2 and maintain the sealing performance of the relevant parts in the filter element assembly 2.

[0121] In the first embodiment, more specifically, the top tightening sleeve 27 adopts a spring cylinder, and the spring 271 in the spring cylinder is axially compressed on the inner side of the same locking member. Since the spring 271 in the spring cylinder is in an axially compressed state, the top tightening sleeve 27 can continuously axially pre-tighten the first end gland 25 of the filter element assembly, and better maintain the pressure on the filter element assembly 2 when the second locking member 29 fails to supplement the compression in time.

[0122] In the first embodiment, more specifically, the first locking member 28 and the second locking member 29 are the same locking member and adopt a first locking nut 211, and the first locking nut 211 is threadedly adapted to the screw section of the inner tie rod 26 extending out of the first end of the shell assembly 1. The first locking nut 211 can be used to conveniently achieve locking and simplify the first locking member 28 and the second locking member 29.

[0123] In the first embodiment, more specifically, the axially tied structure at the second end of the inner tie rod comprises a fourth locking nut 214 (the second locking nut and the third locking nut are described later), and the fourth locking nut 214 is threadedly adapted to be connected with the screw section extending from the second end of the shell assembly on the inner tie rod 26 and axially matched with the second end of the shell assembly 1 (specifically, the second end cover member 13). The fourth locking nut 214 can be used to conveniently achieve locking and simplify the axially tied structure at the second end of the inner tie rod.

[0124] In the first embodiment, more specifically, the diverter disc 18 is installed between the second end of the filter element assembly 2 and the second end of the shell assembly 2. Since the axially tied structure between the diverter disc 18 and the first end of the inner tie rod is distributed at both ends of the filter element assembly 2, there is no interference problem between the diverter disc 18 and the axially tied structure between the first end of the inner tie rod, making the internal structure design of the disc-tube membrane filter simpler.

[0125] Figure 5 This is an appearance diagram of the disc-tube membrane filter of the second embodiment of the present disclosure. Figure 6 for Figure 5 Cross-sectional view of the middle B end. Figure 7 for Figure 5 Cross-sectional view of end A.

[0126] like Figure 5-Figure 7 As shown, the shell assembly 1 of the disc-tube membrane filter of the second embodiment is provided with a second clamping mechanism, and the second clamping mechanism comprises an inner tie rod assembly, and the inner tie rod assembly comprises: an inner tie rod 26, an axial tie structure at the first end of the inner tie rod, and an axial tie structure at the second end of the inner tie rod.

[0127] The inner pull rod 26 is inserted into the filter element assembly 2 along a direction parallel to the clamping direction of the first clamping mechanism 14 .

[0128] The axially-connected structure at the first end of the inner tie rod is arranged at the first end of the inner tie rod 26 and connects the first end of the filter element assembly 2 under the action of the inner tie rod 26 .

[0129] The axially-connected structure at the second end of the inner tie rod is arranged at the second end of the inner tie rod 26 and connects the second end of the shell assembly 1 under the action of the inner tie rod 26 .

[0130] The axial tension structure at the first end of the inner tie rod specifically comprises a tightening sleeve 27, a first locking member 28 and a second locking member 29, wherein the first locking member 28 and the second locking member 29 are the same locking member.

[0131] The tightening sleeve 27 is sleeved on the inner tie rod 26 , and the inner wall of the tightening sleeve 27 is axially slidingly matched with the inner tie rod 26 , and the outer wall of the tightening sleeve 27 is axially slidingly and sealingly matched with the shell assembly 1 (specifically the first end cover component 12 ).

[0132] The first locking piece 28 is assembled on the inner pull rod 26 and is used to axially lock the top tightening sleeve 27 between the first end of the filter element assembly 2 and the first locking piece 28, so that the filter element assembly 2 is pre-tightened by the top tightening sleeve 27. At this time, the part of the shell assembly 1 used to achieve the axial sliding sealing cooperation with the top tightening piece 27 (specifically the first end cover component 12) can pass through the first locking piece 28 and be mounted on the top tightening piece 27.

[0133] The second locking member 29 is assembled on the outside of the shell assembly 1 and is used to axially lock the pressing sleeve 27 between the first end of the filter element assembly 2 and the second locking member 29 , so that the filter element assembly 2 is additionally compressed by the pressing sleeve 27 .

[0134] In the second embodiment, more specifically, the top sleeve 27 adopts a spring cylinder, and the spring 271 in the spring cylinder is axially compressed inside the same locking member 28. In addition, the spring cylinder is axially matched with the first end of the filter element assembly 2 through a support palm integral with the spring cylinder body (such as Figure 7 shown).

[0135] In the second embodiment, more specifically, the first locking member 28 and the second locking member 29 are the same locking member and adopt a first locking nut 211, and the first locking nut 211 is threadedly adapted to be connected with the screw segment on the inner pull rod 26 extending out of the first end of the shell assembly 1.

[0136] In the second embodiment, more specifically, the axial tensioning structure at the second end of the inner pull rod includes a fourth locking nut 214, and the fourth locking nut 214 is threadably adapted to be connected to the screw segment on the inner pull rod 26 extending out of the second end of the shell assembly and axially cooperates with the second end of the shell assembly 1 (specifically, the second end cover member 13).

[0137] In the second embodiment, more specifically, the diverter plate 18 is installed between the second end of the filter element assembly 2 and the second end of the shell assembly 2 .

[0138] The main difference between the disc-tube membrane filter of the second embodiment and the disc-tube membrane filter of the first embodiment is that the directions of the two ends of the disc-tube membrane filter are reversed. When in use, the first raw liquid inlet 15, the first concentrated liquid outlet 16 and the first clear liquid outlet 17 of the disc-tube membrane filter of the first embodiment are all downward, while the first locking member 28 and the second locking member 29 are upward. When in use, the first raw liquid inlet 15, the first concentrated liquid outlet 16 and the first clear liquid outlet 17 of the disc-tube membrane filter of the second embodiment are all upward, while the first locking member 28 and the second locking member 29 are downward.

[0139] Figure 8 It is a cross-sectional view of the disc-tube membrane filter of the third embodiment of the present disclosure. Fig. 9 for Figure 8 Cross-sectional view of end A.

[0140] like Figure 8-Figure 9 As shown, the shell assembly 1 of the disc-tube membrane filter of Example 3 is provided with a second clamping mechanism, and the second clamping mechanism includes an inner tie rod assembly, and the inner tie rod assembly includes: an inner tie rod 26, an axial tie structure at the first end of the inner tie rod, and an axial tie structure at the second end of the inner tie rod.

[0141] The inner pull rod 26 is inserted into the filter element assembly 2 along a direction parallel to the clamping direction of the first clamping mechanism 14 .

[0142] The axially-connected structure at the first end of the inner tie rod is arranged at the first end of the inner tie rod 26 and connects the first end of the filter element assembly 2 under the action of the inner tie rod 26 .

[0143] The axially-connected structure at the second end of the inner tie rod is arranged at the second end of the inner tie rod 26 and connects the second end of the shell assembly 1 under the action of the inner tie rod 26 .

[0144] The axial tension structure at the first end of the inner tie rod specifically comprises a tightening sleeve 27, a first locking member 28 and a second locking member 29, wherein the first locking member 28 and the second locking member 29 are the same locking member.

[0145] The tightening sleeve 27 is sleeved on the inner tie rod 26 , and the inner wall of the tightening sleeve 27 is axially slidingly matched with the inner tie rod 26 , and the outer wall of the tightening sleeve 27 is axially slidingly and sealingly matched with the shell assembly 1 (specifically the first end cover component 12 ).

[0146] The first locking piece 28 is assembled on the inner pull rod 26 and is used to axially lock the top tightening sleeve 27 between the first end of the filter element assembly 2 and the first locking piece 28, so that the filter element assembly 2 is pre-tightened by the top tightening sleeve 27. At this time, the part of the shell assembly 1 used to achieve the axial sliding sealing cooperation with the top tightening piece 27 (specifically the first end cover component 12) can pass through the first locking piece 28 and be mounted on the top tightening piece 27.

[0147] The second locking member 29 is assembled on the outside of the shell assembly 1 and is used to axially lock the pressing sleeve 27 between the first end of the filter element assembly 2 and the second locking member 29 , so that the filter element assembly 2 is additionally compressed by the pressing sleeve 27 .

[0148] In the third embodiment, more specifically, the tightening sleeve 27 is a rigid sleeve, and the rigid sleeve is axially matched with the first end of the filter element assembly 2 via a support plate integral with the rigid sleeve.

[0149] In the third embodiment, more specifically, the first locking member 28 and the second locking member 29 are the same locking member and adopt a first locking nut 211, and the first locking nut 211 is threadedly adapted to be connected with the screw segment on the first end of the inner pull rod 26 extending out of the shell assembly 1.

[0150] In Example 3, more specifically, the axial tensioning structure at the second end of the inner pull rod includes a fourth locking nut 214, and the fourth locking nut 214 is threadably adapted to be connected to the screw segment on the inner pull rod 26 extending out of the second end of the shell assembly and axially cooperates with the second end of the shell assembly 1 (specifically the second end cover member 13).

[0151] In the third embodiment, more specifically, the diverter plate 18 is installed between the second end of the filter element assembly 2 and the second end of the shell assembly 2 .

[0152] In the third embodiment, more specifically, an intermediate sleeve is provided between the first locking member 28 and the top sleeve 27. The intermediate sleeve prevents the first locking member 28 from directly contacting the top sleeve 27, thereby reducing the wear on the end surface of the top sleeve 27.

[0153] The main difference between the disc-tube membrane filter of the third embodiment and the disc-tube membrane filter of the first embodiment is that the tightening sleeve 27 is adjusted from a spring cylinder to a rigid sleeve with a simpler structure.

[0154] Fig.10 It is a cross-sectional view of the disc-tube membrane filter of the fourth embodiment of the present disclosure. Fig.11 for Fig.10 Cross-sectional view of end A.

[0155] like Figure 10-11 As shown, the shell assembly 1 of the disc-tube membrane filter of Example 4 is provided with a second clamping mechanism, and the second clamping mechanism includes an inner tie rod assembly, and the inner tie rod assembly includes: an inner tie rod 26, an axial tie structure at the first end of the inner tie rod, and an axial tie structure at the second end of the inner tie rod.

[0156] The inner pull rod 26 is inserted into the filter element assembly 2 along a direction parallel to the clamping direction of the first clamping mechanism 14 .

[0157] The axially-connected structure at the first end of the inner tie rod is arranged at the first end of the inner tie rod 26 and connects the first end of the filter element assembly 2 under the action of the inner tie rod 26 .

[0158] The axially-connected structure at the second end of the inner tie rod is arranged at the second end of the inner tie rod 26 and connects the second end of the shell assembly 1 under the action of the inner tie rod 26 .

[0159] The axial tension structure at the first end of the inner tie rod specifically comprises a top tightening sleeve 27, a first locking member 28 and a second locking member 29, wherein the first locking member 28 and the second locking member 29 are different locking members.

[0160] The tightening sleeve 27 is sleeved on the inner tie rod 26 , and the inner wall of the tightening sleeve 27 is axially slidingly matched with the inner tie rod 26 , and the outer wall of the tightening sleeve 27 is axially slidingly and sealingly matched with the shell assembly 1 (specifically the first end cover component 12 ).

[0161] The first locking piece 28 is assembled on the inner pull rod 26 and is used to axially lock the top tightening sleeve 27 between the first end of the filter element assembly 2 and the first locking piece 28, so that the filter element assembly 2 is pre-tightened by the top tightening sleeve 27. At this time, the part of the shell assembly 1 used to achieve the axial sliding sealing cooperation with the top tightening piece 27 (specifically the first end cover component 12) can pass through the first locking piece 28 and be mounted on the top tightening piece 27 (because the diameter of the first locking piece 28 is smaller than the diameter of the top tightening sleeve 27, the first end cover component 12) can pass through the first locking piece 28 and be mounted on the top tightening piece 27).

[0162] The second locking member 29 is assembled on the outside of the shell assembly 1 and is used to axially lock the pressing sleeve 27 between the first end of the filter element assembly 2 and the second locking member 29 , so that the filter element assembly 2 is additionally compressed by the pressing sleeve 27 .

[0163] During the assembly of the disc-tube membrane filter, the filter element assembly 2 is pre-tightened by the first locking member 28 and the top tightening sleeve 27, and then the part of the shell assembly 1 used to achieve axial sliding sealing with the top tightening member 27 (specifically the first end cover member 12) passes through the first locking member 28 and is sleeved on the top tightening member 27. In this way, it is possible to effectively avoid the problem of poor assembly caused by displacement of parts in the filter element assembly 2 or sealing failure inside the filter element assembly 2 after assembly. After the first end cover member 12 is assembled, during the operation of the disc-tube membrane filter, the filter element assembly 2 is additionally tightened by the second locking member 29 and the top tightening sleeve 27 to compensate for the pressure loss caused by the overall contraction of the filter element assembly 2 and maintain the sealing performance of the relevant parts in the filter element assembly 2.

[0164] In the fourth embodiment, more specifically, the tightening sleeve 27 is a rigid sleeve, and the rigid sleeve is axially matched with the first end of the filter element assembly 2 via a plug connector integral with the rigid sleeve.

[0165] In Example 4, more specifically, the first locking member 28 includes a second locking nut 212, and the second locking nut 212 is threadedly adapted to be connected to the screw segment at the first end of the inner pull rod 26. The second locking member 29 includes a third locking nut 213, and the third locking nut 213 is threadedly adapted to be connected to the threaded hole on the outer surface of the shell assembly 1. The second locking nut 212 and the third locking nut 213 are coaxially arranged and do not interfere with each other.

[0166] The second locking nut 212 and the third locking nut 213 are arranged separately, which can not only share the force of a single locking nut, but also play a double insurance role. When one of the second locking nut 212 and the third locking nut 213 fails, the pressure is borne by the other locking nut.

[0167] In the fourth embodiment, more specifically, the tightening sleeve 27 has an outer boss 271, the second locking nut is located outside the tightening sleeve 27 and axially cooperates with the end face of the tightening sleeve 27, and the third locking nut is sleeved on the tightening sleeve 27 and axially cooperates with the end face of the outer boss 271.

[0168] In addition, a fixing plate 210 is mounted on the outer surface of the shell component 1, and the threaded hole is provided on the fixing plate 210. The fixing plate 210 can partially press the top sleeve 27, thereby sharing the pressure of the second locking member 29. The fixing plate 210 can be detachably connected to the outer surface of the shell component 1 by bolts.

[0169] Since the threaded hole is opened on the fixing plate 210, the third locking nut 213 is adapted to the threaded hole through an external thread. Therefore, the diameter of the threaded hole is relatively large, and the third locking nut 213 can generate a stronger axial locking force.

[0170] In the fourth embodiment, more specifically, the axial tie structure at the second end of the inner tie rod includes a fourth locking nut (such as Fig.10 As shown), the fourth locking nut is threadably connected to the screw segment on the inner pull rod 26 extending out of the second end of the shell assembly and axially cooperates with the second end of the shell assembly 1 (specifically, the second end cover member 13).

[0171] In the fourth embodiment, more specifically, the diverter plate 18 is installed between the second end of the filter element assembly 2 and the second end of the shell assembly 2 .

[0172] The main difference between the disc-tube membrane filter of the fourth embodiment and the disc-tube membrane filter of the second embodiment lies in the axial tie structure of the first end of the inner tie rod. An important feature of the disc-tube membrane filter of the fourth embodiment is that since the second locking nut 212 is outside the third locking nut 213, after the filter element assembly 2 is additionally compressed by the third locking nut 213 and the top tightening sleeve 27, the second locking nut 212 can be further tightened to eliminate the gap between the second locking nut 212 and the top tightening sleeve 27.

[0173] However, it is found that the main problem of the disc-tube membrane filter of the fourth embodiment is that when the third locking nut 213 is tightened, the top sleeve 27 is subjected to the torsion force transmitted by the third locking nut 213, so the top sleeve 27 and the filter element assembly 2 are prone to torsion deformation, which easily affects the internal sealing performance of the filter element assembly 2. Therefore, a disc-tube membrane filter of the fifth embodiment is further proposed.

[0174] Fig.12 This is an appearance diagram of the disc-tube membrane filter of the fifth embodiment of the present disclosure. Fig.13 for Fig.12Cross-sectional view of end A.

[0175] like Figure 12-13 As shown, the shell assembly 1 of the disc-tube membrane filter of Example 5 is provided with a second clamping mechanism, and the second clamping mechanism includes an inner tie rod assembly, and the inner tie rod assembly includes: an inner tie rod 26, an axial tie structure at the first end of the inner tie rod, and an axial tie structure at the second end of the inner tie rod.

[0176] The inner pull rod 26 is inserted into the filter element assembly 2 along a direction parallel to the clamping direction of the first clamping mechanism 14 .

[0177] The axially-connected structure at the first end of the inner tie rod is arranged at the first end of the inner tie rod 26 and connects the first end of the filter element assembly 2 under the action of the inner tie rod 26 .

[0178] The axially-connected structure at the second end of the inner tie rod is arranged at the second end of the inner tie rod 26 and connects the second end of the shell assembly 1 under the action of the inner tie rod 26 .

[0179] The axial tension structure at the first end of the inner tie rod specifically comprises a top tightening sleeve 27, a first locking member 28 and a second locking member 29, wherein the first locking member 28 and the second locking member 29 are different locking members.

[0180] The tightening sleeve 27 is sleeved on the inner tie rod 26 , and the inner wall of the tightening sleeve 27 is axially slidingly matched with the inner tie rod 26 , and the outer wall of the tightening sleeve 27 is axially slidingly and sealingly matched with the shell assembly 1 (specifically the first end cover component 12 ).

[0181] The first locking piece 28 is assembled on the inner pull rod 26 and is used to axially lock the top tightening sleeve 27 between the first end of the filter element assembly 2 and the first locking piece 28, so that the filter element assembly 2 is pre-tightened by the top tightening sleeve 27. At this time, the part of the shell assembly 1 used to achieve the axial sliding sealing cooperation with the top tightening piece 27 (specifically the first end cover component 12) can pass through the first locking piece 28 and be mounted on the top tightening piece 27.

[0182] The second locking member 29 is assembled on the outside of the shell assembly 1 and is used to axially lock the pressing sleeve 27 between the first end of the filter element assembly 2 and the second locking member 29 , so that the filter element assembly 2 is additionally compressed by the pressing sleeve 27 .

[0183] During the assembly of the disc-tube membrane filter, the filter element assembly 2 is pre-tightened by the first locking member 28 and the top tightening sleeve 27, and then the part of the shell assembly 1 used to achieve axial sliding sealing with the top tightening member 27 (specifically the first end cover member 12) passes through the first locking member 28 and is sleeved on the top tightening member 27. In this way, it is possible to effectively avoid the problem of poor assembly caused by displacement of parts in the filter element assembly 2 or sealing failure inside the filter element assembly 2 after assembly. After the first end cover member 12 is assembled, during the operation of the disc-tube membrane filter, the filter element assembly 2 is additionally tightened by the second locking member 29 and the top tightening sleeve 27 to compensate for the pressure loss caused by the overall contraction of the filter element assembly 2 and maintain the sealing performance of the relevant parts in the filter element assembly 2.

[0184] In the fifth embodiment, more specifically, the top tightening sleeve 27 is a steel sleeve, which is connected as a whole with a gland (i.e., a first end gland 25 of the filter element assembly) constituting the first end of the filter element assembly and axially slidingly cooperating with the inner pull rod 26. Here, the steel sleeve is connected to the first end gland 25 of the filter element assembly by welding.

[0185] In Example 5, more specifically, the first locking member 28 includes a second locking nut 212, and the second locking nut 212 is threadedly adapted to be connected to the screw segment at the first end of the inner pull rod 26. The second locking member 29 includes a third locking nut 213, and the third locking nut 213 is threadedly adapted to be connected to the threaded hole on the outer surface of the shell assembly 1. The second locking nut 212 and the third locking nut 213 are coaxially arranged and do not interfere with each other.

[0186] In embodiment five, more specifically, the inner hole of the tightening sleeve 27 is a stepped hole, the second locking nut 212 is located inside the tightening sleeve 27 and axially cooperates with the end face of the stepped hole, and the third locking nut 213 is sleeved on the outside of the first end of the inner pull rod 26 and axially cooperates with the end face of the tightening sleeve 27.

[0187] In addition, a fixing plate 210 is mounted on the outer surface of the shell assembly 1, and the threaded hole is provided on the fixing plate 210. Since the threaded hole is provided on the fixing plate 210, the third locking nut 213 is adapted to the threaded hole through an external thread, and therefore, the diameter of the threaded hole is larger, and the third locking nut 213 can generate a stronger axial locking force.

[0188] In the fifth embodiment, more specifically, the axial tie structure at the second end of the inner tie rod comprises a fourth locking nut (such as Fig.12 As shown), the fourth locking nut is threadably connected to the screw segment on the inner pull rod 26 extending out of the second end of the shell assembly and axially cooperates with the second end of the shell assembly 1 (specifically, the second end cover member 13).

[0189] In the fifth embodiment, more specifically, the diverter plate 18 is installed between the second end of the filter element assembly 2 and the second end of the shell assembly 2 .

[0190] In the fifth embodiment, the axial tensioning structure at the first end of the inner tie rod particularly further comprises a tightening sleeve anti-twist structure, and the tightening sleeve anti-twist structure prevents the tightening sleeve 27 from twisting when the tightening sleeve 27 is driven to axially compress the filter element assembly 1.

[0191] Fig.19 Schematic diagram of the anti-twist structure of the top tightening sleeve in the disc-tube membrane filter of the fifth embodiment of the present disclosure. Fig.19 As shown, in this embodiment, the anti-rotation structure of the top tightening sleeve specifically includes a spacer 215 compressed between the top tightening sleeve 27 and the third locking nut 213, and a rotation-stopping matching structure 216 is provided between the spacer 215 and the shell component (specifically the first end cover component 12). Fig.19 It can be seen that the anti-rotation fitting structure 216 includes a protrusion located on the side of the cushion block 215, and the protrusion is just adapted to the groove in the first end cover component 12. The protrusion can move axially in the groove but is circumferentially limited by the groove.

[0192] Therefore, in the process of tightening the third locking nut 213, the spacer 215 can transmit the axial force applied by the third locking nut 213 to the spacer 215, but cannot transmit the torsional force applied by the third locking nut 213 to the spacer 215. Therefore, the torsional force transmitted by the third locking nut 213 to the top sleeve 27 is blocked by the spacer 215, so that the top sleeve 27 and the filter element assembly 2 can be prevented from torsional deformation. Therefore, the spacer 215 can be regarded as an isolation component.

[0193] With a little imagination, the spacer 215 can be replaced by a bearing (such as a thrust bearing) that can withstand axial force, because such a bearing, as an isolation component, has the function of easily transmitting the axial force applied by the third locking nut 213 to the isolation component but not easily transmitting the torsional force applied by the third locking nut 213 to the isolation component.

[0194] Although the disc-tube membrane filter of the fifth embodiment can solve the problem of torsional deformation of the top tightening sleeve 27 and the filter element assembly 2, it still has the problem that the axial clearance between the second locking nut 212 and the top tightening sleeve 27 is difficult to eliminate after the filter element assembly 2 is additionally compressed by the third locking nut 213 and the top tightening sleeve 27. Therefore, a disc-tube membrane filter of the sixth embodiment is further proposed.

[0195] Fig.14 This is an appearance diagram of the disc-tube membrane filter of the fifth embodiment of the present disclosure. Fig.15 for Fig.14 A magnified view of the B end. Fig.16for Fig.14 Cross-sectional view of the middle B end. Fig.17 for Fig.14 Cross-sectional view of end A.

[0196] like Figure 14-17 As shown, the shell assembly 1 of the disc-tube membrane filter of Example 6 is provided with a second clamping mechanism, and the second clamping mechanism includes an inner tie rod assembly, and the inner tie rod assembly includes: an inner tie rod 26, an axial tie structure at the first end of the inner tie rod, and an axial tie structure at the second end of the inner tie rod.

[0197] The inner pull rod 26 is inserted into the filter element assembly 2 along a direction parallel to the clamping direction of the first clamping mechanism 14 .

[0198] The axially-connected structure at the first end of the inner tie rod is arranged at the first end of the inner tie rod 26 and connects the first end of the filter element assembly 2 under the action of the inner tie rod 26 .

[0199] The axially-connected structure at the second end of the inner tie rod is arranged at the second end of the inner tie rod 26 and connects the second end of the shell assembly 1 under the action of the inner tie rod 26 .

[0200] The axial tension structure at the first end of the inner tie rod specifically comprises a top tightening sleeve 27, a first locking member 28 and a second locking member 29, wherein the first locking member 28 and the second locking member 29 are different locking members.

[0201] The tightening sleeve 27 is sleeved on the inner tie rod 26 , and the inner wall of the tightening sleeve 27 is axially slidingly matched with the inner tie rod 26 , and the outer wall of the tightening sleeve 27 is axially slidingly and sealingly matched with the shell assembly 1 (specifically the first end cover component 12 ).

[0202] The first locking piece 28 is assembled on the inner pull rod 26 and is used to axially lock the top tightening sleeve 27 between the first end of the filter element assembly 2 and the first locking piece 28, so that the filter element assembly 2 is pre-tightened by the top tightening sleeve 27. At this time, the part of the shell assembly 1 used to achieve the axial sliding sealing cooperation with the top tightening piece 27 (specifically the first end cover component 12) can pass through the first locking piece 28 and be mounted on the top tightening piece 27.

[0203] The second locking member 29 is assembled on the outside of the shell assembly 1 and is used to axially lock the pressing sleeve 27 between the first end of the filter element assembly 2 and the second locking member 29 , so that the filter element assembly 2 is additionally compressed by the pressing sleeve 27 .

[0204] In the sixth embodiment, more specifically, the top tightening sleeve 27 adopts a rigid sleeve, and the rigid sleeve is connected as a whole with the gland (i.e., the first end gland 25 of the filter element assembly) constituting the first end of the filter element assembly and axially slidingly cooperating with the inner tie rod 26. In the sixth embodiment, more specifically, the first locking member 28 includes a second locking nut 212, and the second locking nut 212 is threadedly adapted to the screw section at the first end of the inner tie rod 26, and the second locking member 29 includes a third locking nut 213, and the third locking nut 213 is threadedly adapted to the threaded hole on the outer surface of the shell assembly 1, and the second locking nut 212 and the third locking nut 213 are coaxially arranged and do not interfere with each other.

[0205] In the sixth embodiment, more specifically, the inner hole of the top sleeve 27 is a stepped hole, the second locking nut 212 is located inside the top sleeve 27 and axially matches with the end face of the stepped hole, and the third locking nut 213 is sleeved on the first end of the inner tie rod 26 and axially matches with the end face of the top sleeve 27. In addition, a fixing plate 210 is mounted on the outer surface of the shell assembly 1, and the threaded hole is opened on the fixing plate 210.

[0206] In Example 6, more specifically, the axial tensioning structure at the second end of the inner pull rod includes a fourth locking nut 214, and the fourth locking nut 214 is threadably adapted to be connected to the screw segment on the inner pull rod 26 extending out of the second end of the shell assembly and axially cooperates with the second end of the shell assembly 1 (specifically, the second end cover component 13).

[0207] In the sixth embodiment, more specifically, the diverter plate 18 is installed between the second end of the filter element assembly 2 and the second end of the shell assembly 2 .

[0208] In the fifth embodiment, the axial tensioning structure at the first end of the inner tie rod particularly further comprises a tightening sleeve anti-twist structure, and the tightening sleeve anti-twist structure prevents the tightening sleeve 27 from twisting when the tightening sleeve 27 is driven to axially compress the filter element assembly 1.

[0209] Fig.18 Schematic diagram of the anti-twist structure of the top tightening sleeve in the disc-tube membrane filter of the sixth embodiment of the present disclosure. Fig.18 As shown, in this embodiment, the anti-twist structure of the tightening sleeve includes mutually matching tightening sleeve anti-rotation surfaces respectively arranged on the inner wall of the step hole and the outer wall of the second locking nut 212, and the torsional force of the third locking nut 213 exerted on the tightening sleeve 27 is transmitted to the second locking nut 212 through the mutually matching tightening sleeve anti-rotation surfaces to drive the second locking nut 212 to rotate in the direction of axially locking the tightening sleeve 27.

[0210] from Fig.18It can be seen that the locking sleeve rotation stop surface 216 on the outer wall of the second locking nut 212 is a plane cut out on the cylindrical surface of the second locking nut 212, so the inner wall of the step hole also has a plane matching the plane. In this way, when the locking sleeve 27 is subjected to the torsional force of the third locking nut 213, it can be transmitted to the second locking nut 212 through the mutually matched locking sleeve rotation stop surface, and the second locking nut 212 is subjected to the torsional force from the locking sleeve 27 to drive the second locking nut 212 to rotate in the direction of axially locking the locking sleeve 27. Since the second locking nut 212 has been locked and is difficult to rotate, the second locking nut 212 will also apply a reaction force to the locking sleeve 27 to hinder the torsional force of the locking sleeve 27.

[0211] In addition, a stop plate 211 is provided on the outer surface of the shell assembly 1, which can be further detachably installed on the outer surface of the shell assembly 1 when the fourth locking nut 214 is installed. A stop tooth is provided on the inner hole of the stop plate 211, and the stop tooth is snap-fitted with the prismatic surface of the fourth locking nut 214.

[0212] Furthermore, at least two arc-shaped through holes (such as Fig.15 As shown), the anti-rotation plate 211 is detachably mounted on the corresponding end face of the shell assembly 1 (specifically, the end face of the second end cover member 13) by means of bolts respectively penetrated through the corresponding circular arc-shaped through holes in the at least two circular arc-shaped through holes.

[0213] Therefore, the torsional force transmitted by the third locking nut 213 to the top tightening sleeve 27 can be transmitted to the shell assembly 1 through the top tightening sleeve anti-rotation surface 216, the inner pull rod 26, the fourth locking nut 214 and the anti-rotation disk 211 in sequence, thereby more effectively preventing the top tightening sleeve 27 and the filter element assembly 2 from torsional deformation.

[0214] A major feature of the anti-twist structure of the top tightening sleeve in the disc-tube membrane filter of Example 6 is that the second locking nut 212 can be further tightened when the third locking nut 213 is tightened, thereby avoiding the generation of an axial gap between the second locking nut 212 and the top tightening sleeve 27.

[0215] Other embodiments

[0216] On the basis of the above embodiments, the structure of the disc-tube membrane filter may be adjusted as needed, for example, the relevant functions of the disc-tube membrane filter may be simplified.

[0217] For example, the second locking nut 212 can be eliminated based on the disc-tube membrane filter of embodiment five or the disc-tube membrane filter of embodiment six, so that the disc-tube membrane filter no longer has the pre-tightening function of the filter element assembly 2 before complete assembly.

[0218] For another example, based on the disc-tube membrane filter of implementation three, it is not required to further tighten the top tightening sleeve 27 during the use of the disc-tube membrane filter to avoid the risk of twisting deformation of the top tightening sleeve 27 and the filter element assembly 2.

[0219] The above is a description of the relevant contents of the present disclosure. A person skilled in the art will be able to implement the present disclosure based on these descriptions. Based on the above contents of this specification, all other embodiments obtained by a person skilled in the art without making any creative work shall fall within the scope of the present disclosure.

Claims

1. Filters, including: A shell assembly, wherein the shell assembly constitutes a pressure vessel held by a first clamping mechanism on the shell assembly and is respectively provided with a first raw liquid inlet, a first concentrated liquid outlet, and a first clear liquid outlet; A filter element assembly, which is installed in the pressure vessel in a compressed manner and is respectively provided with a second raw liquid inlet, a second concentrated liquid outlet and a second clear liquid outlet; Wherein, the first stock liquid inlet is connected with the second stock liquid inlet to form a stock liquid passage, the first concentrated liquid outlet is connected with the second concentrated liquid outlet to form a concentrated liquid passage, and the first clear liquid outlet is connected with the second clear liquid outlet to form a clear liquid passage; Features: The shell assembly is provided with a second clamping mechanism, the second clamping mechanism comprises an inner pull rod assembly, and the inner pull rod assembly comprises: An inner pull rod, the inner pull rod being inserted into the filter element assembly along a direction parallel to the clamping direction of the first clamping mechanism; An axial tie structure at the first end of the inner tie rod, wherein the axial tie structure at the first end of the inner tie rod is arranged at the first end of the inner tie rod and is tied to the first end of the filter element assembly under the action of the inner tie rod; An axially-connected structure at the second end of the inner tie rod, wherein the axially-connected structure at the second end of the inner tie rod is arranged at the second end of the inner tie rod and connects the second end of the shell assembly under the action of the inner tie rod; The axial tension structure at the first end of the inner tie rod comprises a tightening sleeve, a locking nut at the first end of the inner tie rod and an anti-twist structure of the tightening sleeve; The tightening sleeve is sleeved on the inner tie rod, the inner wall of the tightening sleeve is axially slidably matched with the inner tie rod, and the outer wall of the tightening sleeve is axially slidably and sealingly matched with the shell assembly; The locking nut at the first end of the inner tie rod is assembled on the outer side of the shell assembly and threadedly adapted to the corresponding screw segment on the inner tie rod or threadedly adapted to the threaded hole on the shell assembly. The locking nut at the first end of the inner tie rod is used to axially lock the top sleeve between the first end of the filter element assembly and the locking nut at the first end of the inner tie rod, so that the filter element assembly is pressed by the top sleeve; The anti-twist structure of the tightening sleeve is used to prevent the tightening sleeve from twisting when the tightening sleeve is driven by the locking nut at the first end of the inner pull rod. The anti-twist structure of the tightening sleeve includes an isolation component that is compressed between the tightening sleeve and the locking nut at the first end of the inner pull rod. The isolation component is easy to transmit the axial force applied by the locking nut at the first end of the inner pull rod to the isolation component, but is not easy to transmit the torsional force applied by the locking nut at the first end of the inner pull rod to the isolation component.

2. The filter according to claim 1, characterized in that: The isolation component includes a cushion block, and a rotation-stopping fitting structure is arranged between the cushion block and the shell component.

3. The filter according to claim 1, characterized in that: A fixing disk is mounted on the outer surface of the shell component, and the threaded hole is opened on the fixing disk.

4. The filter according to claim 1, characterized in that: The tightening sleeve includes a rigid sleeve, which is axially matched with the first end of the filter element assembly through a support plate and / or a plug connector integral with the rigid sleeve; or, the tightening sleeve includes a rigid sleeve, which is integrally connected to a pressure cover that constitutes the first end of the filter element assembly and is axially slidably matched with the inner pull rod.

5. The filter according to any one of claims 1 to 4, characterized in that: The shell assembly comprises: Tube shell; a first end cover member mounted on a first end of the tube shell; a second end cover member mounted on a second end of the tube shell; and A first pressing mechanism is used to press the first end cover component and the second end cover component onto two ends of the tube shell along the axial direction of the tube shell.

6. The filter according to claim 5, characterized in that: The first clamping mechanism comprises a plurality of outer tie rod assemblies spaced apart circumferentially, and the outer tie rod assemblies comprise: An external tie rod, the external tie rod is located outside the tube shell and extends along the axial direction of the tube shell; An axial tie structure at the first end of the outer tie rod, wherein the axial tie structure at the first end of the outer tie rod is arranged at the first end of the outer tie rod and is tied to the first end cover member under the action of the outer tie rod; The axially-connecting structure at the second end of the outer tie rod is arranged at the second end of the outer tie rod and connects the second end cover component under the action of the outer tie rod.

7. The filter according to any one of claims 1 to 4, characterized in that: The filter element assembly comprises a plurality of disc-shaped cross-flow filter units, which are stacked and compressed along the compression direction of the first compression mechanism; the disc-shaped cross-flow filter units are provided with a raw liquid port, a concentrated liquid port and a clear liquid port, the raw liquid port of any disc-shaped cross-flow filter unit is connected with the concentrated liquid port of the adjacent previous disc-shaped cross-flow filter unit, the raw liquid port of the first disc-shaped cross-flow filter unit constitutes the second raw liquid inlet, the concentrated liquid port of the last disc-shaped cross-flow filter unit constitutes the second concentrated liquid outlet, the clear liquid ports of these disc-shaped cross-flow filter units are connected to form a clear liquid output channel, and the outlet of the clear liquid output channel constitutes the second clear liquid outlet.

8. The filter according to claim 7, characterized in that: The filter is a disc-tube membrane filter in which a disc-shaped cross-flow filter unit in a filter element assembly adopts a disc-shaped cross-flow filter unit in the form of a combination of a guide disc and a membrane.

9. The filter according to claim 7, characterized in that: The inner pull rod is a tubular structure and is respectively connected to the clear liquid ports of the disc-shaped cross-flow filter units to serve as the clear liquid output channel.

10. The filter according to claim 7, characterized in that: A diverter disk is installed between one end of the filter element assembly and the corresponding end of the shell assembly, and the diverter disk and the inner wall of the shell assembly form a drainage gap. The first raw liquid inlet and the second raw liquid inlet are connected through a first channel located in the diverter disk to form a raw liquid passage. The first concentrated liquid outlet and the second concentrated liquid outlet are connected through the drainage gap and the second channel located in the diverter disk to form a concentrated liquid passage. The first clear liquid outlet and the second clear liquid outlet are connected through a third channel located in the diverter disk to form a clear liquid passage.

11. The filter according to claim 10, characterized in that: The diverter plate is mounted between the second end of the filter element assembly and the second end of the shell assembly.

12. The filter according to any one of claims 1 to 4, characterized in that: The filter element assembly comprises a first end gland of the filter element assembly, and the first end gland of the filter element assembly constitutes the first end of the filter element assembly.

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