A test filter element for a drying device for storage tanks and its assembly method

Abstract

This invention relates to the field of drying equipment technology, and in particular to a detection filter element and its assembly method for a drying equipment for storage tanks. The filter element includes a detection structure disposed on the upper part of a desiccant container for detecting a moisture signal. By setting the detection structure on the upper part of the desiccant container, the invention divides the desiccant layer within the container into a first moisture-absorbing layer corresponding to a predetermined maintenance cycle t1, and a remaining effective moisture-absorbing layer corresponding to a reserved maintenance cycle t2, ensuring that the height H1 of the first moisture-absorbing layer and the height H2 of the remaining effective moisture-absorbing layer satisfy a certain condition. Therefore, the detection structure can not only output a moisture signal when the first moisture-absorbing layer reaches a predetermined level of moisture, but also continue to provide a moisture absorption margin matching the reserved maintenance cycle through the remaining effective moisture-absorbing layer, preventing moisture penetration immediately after the detection structure outputs a moisture signal.

Description

Technical Field

[0001] This invention relates to the field of drying equipment technology, and in particular to a test filter element for a drying device for storage tanks and its assembly method. Background Technology

[0002] In storage tank breathing systems, gas drying systems, and other devices that require dehumidification of flowing gases, desiccant containers filled with desiccant are usually installed. The desiccant absorbs and dries the air or gas entering the device, thereby reducing the moisture content in the gas and preventing moisture from entering subsequent equipment or storage space, which could adversely affect the quality of the medium, the stability of equipment operation, and the safety of the system.

[0003] In existing technologies, to determine the moisture status of desiccants, detection components are typically installed on the desiccant container to monitor its moisture level, allowing operators to replace or maintain the desiccant promptly based on the detection results. However, the placement of these detection components is usually fixed, often prioritizing ease of installation or observation, rather than taking into account the moisture absorption characteristics of the desiccant layer and actual maintenance cycles. Since desiccants typically do not fail simultaneously during use, but rather gradually accumulate moisture along the gas flow direction, if the detection component is placed too low, a replacement warning may be issued when the desiccant still has significant effective moisture absorption capacity, resulting in low desiccant utilization. Conversely, if the detection component is placed too high, insufficient effective moisture-absorbing desiccant may remain after a moisture signal is detected, making it difficult to ensure that the gas flowing out of the desiccant container remains dry within the reserved maintenance time, thus increasing the risk of moisture penetration. Summary of the Invention

[0004] In this section, as well as in the abstract and title of this application, some simplifications or omissions may be made to avoid obscuring the purpose of this section, the abstract, and the title of this application, and such simplifications or omissions shall not be used to limit the scope of the invention.

[0005] To address the shortcomings of existing technologies, one objective of this invention is to provide a detection filter element for a drying device used in storage tanks.

[0006] To achieve the above objectives, the present invention adopts the following technical solution: a detection filter element for a drying device for storage tanks, comprising a detection structure disposed along the height direction of the desiccant container at a predetermined distance from the top of the desiccant container, for detecting a moisture signal; wherein, the detection structure divides the desiccant layer inside the desiccant container into a first moisture-absorbing layer corresponding to a predetermined maintenance cycle t1, and a remaining effective moisture-absorbing layer corresponding to a reserved maintenance cycle t2, the first moisture-absorbing layer being located below the detection structure, and the remaining effective moisture-absorbing layer being located above the detection structure; the height H1 of the first moisture-absorbing layer and the height H2 of the remaining effective moisture-absorbing layer satisfy: β is a reserved correction factor selected based on the moisture absorption capacity, particle size, bulk density, gas flow rate, and operating environment of different desiccants.

[0007] As a preferred embodiment of the detection filter element of the drying device for storage tanks according to the present invention, the detection structure includes an outer cylinder that is vertically disposed inside the desiccant container, the axis of the outer cylinder intersecting the axis of the desiccant container; and an outer hole that is vertically disposed on the surface of the outer cylinder, the axis of the outer hole intersecting the axis of the outer cylinder.

[0008] As a preferred embodiment of the detection filter element of the drying device for storage tanks described in this invention, the detection structure further includes an inner cylinder disposed inside the outer cylinder; and an inner hole perpendicularly disposed on the surface of the inner cylinder, the axis of the inner hole intersecting the axis of the inner cylinder.

[0009] As a preferred embodiment of the detection filter element of the drying device for storage tanks according to the present invention, wherein: there are multiple outer holes, and the multiple outer holes are arranged at equal intervals along the axis of the outer cylinder; wherein the edge of the outer hole closest to the axis of the desiccant container is arranged adjacent to the axis of the desiccant container, and the edge of the outer hole closest to the side wall of the desiccant container is arranged adjacent to the side wall of the desiccant container, so that the multiple outer holes are equidistantly distributed within the radius of the desiccant container.

[0010] As a preferred embodiment of the detection filter element of the drying device for storage tanks according to the present invention, wherein: there are multiple inner holes, and the multiple inner holes are arranged at equal intervals along the axis of the inner cylinder, and the distance between adjacent inner holes is the same as the distance between adjacent outer holes; wherein each inner hole corresponds one-to-one with the corresponding outer hole and is coaxially arranged.

[0011] As a preferred embodiment of the detection filter element of the drying device for storage tanks described in this invention, wherein: a first cover is provided at one end of the inner cylinder, and a second cover is provided at the other end of the inner cylinder; wherein, a through rod is provided on the first cover, one end of the through rod extends to the outside of the inner cylinder and forms a male part, and a female part adapted to the male part is provided on the second cover.

[0012] As a preferred embodiment of the detection filter element of the drying device for storage tanks described in this invention, wherein: a connector is provided at one end of the outer cylinder, a closed continuous contact surface is formed between the first cover and the connector, and a first groove is provided on the end face of the first cover, the first groove being located at the continuous contact surface.

[0013] As a preferred embodiment of the detection filter element of the drying device for storage tanks described in this invention, wherein: an inner mesh is provided inside the inner cylinder, and a second groove is provided on the end face of the second cover; wherein, the second groove includes a groove side surface and a groove bottom surface, the groove side surface is in close contact with the inner mesh, and the groove bottom surface is in close contact with the end of the inner cylinder.

[0014] As a preferred embodiment of the detection filter element of the drying device for storage tanks according to the present invention, the inner cylinder includes a first outer extension, a first perforated section, and a first inner extension, the lengths of the first outer extension, the first perforated section, and the first inner extension along the axial direction of the inner cylinder being L1, L2, and L3, respectively; the outer cylinder includes a second outer extension, a second perforated section, and a second inner extension, the lengths of the second outer extension, the second perforated section, and the second inner extension along the axial direction of the outer cylinder being L4, L5, and L6, respectively; wherein L1=L4, L2=L5, L3<L6, and L2 and L5 are both equal to the radius of the desiccant container.

[0015] As a preferred embodiment of the detection filter element of the drying device for storage tanks described in this invention, the first moisture-absorbing layer and the remaining effective moisture-absorbing layer are both formed by filling 4A molecular sieve particles.

[0016] To address the shortcomings of the prior art, another objective of this invention is to provide a method for assembling a test filter element.

[0017] The present invention adopts the following technical solution: an assembly method for a detection filter element, comprising the following steps: an outer cylinder welding and fixing step, wherein an outer cylinder is manufactured and welded and fixed to the surface of a desiccant container; an inner cylinder assembly manufacturing step, wherein an inner cylinder is manufactured and a detection agent is loaded into the inner cylinder to form an inner cylinder assembly; an assembly step, wherein the inner cylinder assembly is inserted into the outer cylinder and the inner cylinder assembly is detachably fixed to the outer cylinder; wherein the outer cylinder is welded and fixed to the upper part of the desiccant container so that a residual effective moisture-absorbing layer is formed between the detection structure formed by the outer cylinder and the top of the desiccant container; after the inner cylinder assembly is installed into the outer cylinder, the inner hole and the outer hole correspond one-to-one and are coaxially arranged.

[0018] In a preferred embodiment of the assembly method for the detection filter element of the present invention, the outer cylinder welding and fixing step includes: selecting a first cylinder to form the outer cylinder; welding a circular plate to one end of the first cylinder to seal one end of the first cylinder; welding a connector to the outer circumferential surface of the other end of the first cylinder; opening a plurality of external holes perpendicular to the axis of the first cylinder in the second opening section of the first cylinder; opening an assembly hole adapted to the first cylinder on the surface of the desiccant container, below the remaining effective moisture-absorbing layer; inserting the end of the first cylinder with the circular plate into the assembly hole, so that the axis of the first cylinder intersects the axis of the desiccant container, and placing the second extension section outside the desiccant container and the second opening section inside the desiccant container; and welding and fixing at the assembly hole.

[0019] As a preferred embodiment of the assembly method for the detection filter element of the present invention, the inner cylinder assembly manufacturing step includes: selecting a second cylinder with a diameter smaller than the inner diameter of the first cylinder to form the inner cylinder; welding a first cap to one end of the second cylinder; opening a first groove on the end face of the first cap and in the overlapping area with the connector, and installing a sealing gasket in the first groove; opening a first through hole at the center of the end face of the first cap, allowing a through rod with a handle to pass through the first through hole and extend to the outside of the second cylinder, and welding the handle to the first cap for fixation; in the through hole... An external thread is provided at the end of the rod to form a male component; a second cap is selected, a second groove is opened on the end face of the second cap, a second through hole is opened at the center of the end face of the second cap, and a female component adapted to the male component is fixed at the second through hole; an inner mesh with a diameter smaller than the inner diameter of the second cylinder is selected, the inner mesh is inserted into the second cylinder, and the detection agent is loaded into the inner mesh; the female component on the second cap is threadedly connected to the male component on the through rod until the bottom surface of the second groove contacts the end of the second cylinder, and the side surface of the second groove is in close contact with the inner mesh.

[0020] In a preferred embodiment of the assembly method for the detection filter element of the present invention, the assembly step includes: inserting the inner cylinder into the outer cylinder, making the sealing gasket and the connector in close contact, and then detachably fixing the first cover and the connector by fasteners passing through the first cover and the connector; wherein, after the first cover and the connector are fixed, the plurality of inner holes are respectively coaxially arranged with the corresponding outer holes.

[0021] The beneficial effects of this invention are as follows: By setting a detection structure at the top of the desiccant container, this invention divides the desiccant layer inside the container into a first moisture-absorbing layer corresponding to a predetermined maintenance cycle t1, and a remaining effective moisture-absorbing layer corresponding to a reserved maintenance cycle t2, and ensures that the height H1 of the first moisture-absorbing layer and the height H2 of the remaining effective moisture-absorbing layer satisfy the following conditions: Therefore, the detection structure can not only output a moisture signal when the first moisture-absorbing layer reaches a predetermined level of moisture, but also continue to provide a moisture absorption margin matching the reserved maintenance cycle through the remaining effective moisture-absorbing layer, preventing moisture penetration immediately after the detection structure outputs a moisture signal. Thus, this application establishes a correspondence between the location of the detection structure and the first moisture-absorbing layer, the remaining effective moisture-absorbing layer, the predetermined maintenance cycle, the reserved maintenance cycle, and the moisture absorption characteristics of the desiccant layer. This avoids both insufficient desiccant utilization due to an excessively low detection position and insufficient remaining effective moisture-absorbing layer after detection due to an excessively high detection position, thereby improving the detection rationality, drying stability, and maintenance buffer reliability of the filter element. Attached Figure Description

[0022] To more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the following description of the embodiments will be briefly introduced. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0023] Figure 1 This is a schematic diagram of the overall structure of the detection filter element of the drying device for storage tanks according to the present invention.

[0024] Figure 2 This is a schematic diagram of the outer cylinder of the present invention.

[0025] Figure 3 This is a schematic diagram of the inner cylinder of the present invention.

[0026] Figure 4 This is a schematic diagram of the assembly of the outer cylinder and the inner cylinder of the present invention.

[0027] Figure 5 This is a schematic diagram of the through rod structure of the present invention.

[0028] Figure 6This is a schematic diagram of the assembly of the intranet of the present invention.

[0029] Figure 7 This is a schematic diagram of the side surface and bottom surface of the groove in this invention.

[0030] Figure 8 This is a schematic diagram showing the lengths of the first outer extension segment, the first opening segment, and the first inner extension segment of the present invention.

[0031] Figure 9 This is a schematic diagram showing the lengths of the second outer extension segment, the second opening segment, and the second inner extension segment of the present invention.

[0032] In the diagram: 100, detection structure; 101, outer cylinder; 102, outer hole; 103, inner cylinder; 103a, inner mesh; 104, inner hole; 105, first cap; 105a, through rod; 105b, male component; 105c, first groove; 106, second cap; 106a, female component; 106b, second groove; 107, connector; 200, desiccant container; N1, first moisture-absorbing layer; N2, remaining effective moisture-absorbing layer; O, continuous contact surface; M1, side surface of the tank; M2, bottom surface of the tank. Detailed Implementation

[0033] To enable those skilled in the art to better understand the present invention, the present invention will be further described in detail below with reference to specific embodiments and accompanying drawings.

[0034] The terminology used in this invention is that which is currently widely used in the art in consideration of the function of the invention; however, these terms may vary according to the intent of those skilled in the art, precedent, or new technology in the art. Furthermore, specific terms may be chosen by the applicant, and in such cases, their detailed meanings will be described in the detailed description of the invention. Therefore, the terms used in this specification should not be construed as simple names, but rather based on their meanings and the overall description of the invention.

[0035] In this invention, the desiccant container 200 can be an independent container used in a storage tank breathing system, process gas drying system, or other dehumidification equipment, or it can be a functional module connected to a breather valve, flame arrester, or connecting pipeline. The desiccant container 200 is filled with a desiccant layer. The detection structure 100 is positioned along the height direction of the desiccant container 200 at a predetermined distance from the top of the desiccant container 200, and divides the desiccant layer into a first moisture-absorbing layer N1 corresponding to a predetermined maintenance cycle t1, and a remaining effective moisture-absorbing layer N2 corresponding to a reserved maintenance cycle t2. The first moisture-absorbing layer N1 is located below the detection structure 100, and the remaining effective moisture-absorbing layer N2 is located above the detection structure 100. The first moisture-absorbing layer N1 is located on the side of the detection structure 100 facing the air inlet or the lower part, and the remaining effective moisture-absorbing layer N2 is located on the side of the detection structure 100 facing the air outlet or the top. As the gas passes through the first moisture-absorbing layer N1, its moisture content gradually decreases. With prolonged operation, a damp area gradually forms in the first moisture-absorbing layer N1 along the gas flow direction. When this damp area reaches the location of the detection structure 100, the detection structure 100 outputs a moisture signal. The remaining effective moisture-absorbing layer N2 is used to continue providing moisture absorption margin corresponding to the reserved maintenance cycle t2 after the detection structure 100 detects a moisture signal, allowing personnel to complete inspection, disassembly, replacement, or regeneration maintenance without stopping the machine or its operation.

[0036] Example 1, referring to Figure 1 This embodiment provides a detection filter element for a drying device for storage tanks. The core of this detection filter element lies in the presence of a detection structure 100 at the top of the desiccant container 200. This detection structure 100 divides the desiccant layer within the desiccant container 200 into a first moisture-absorbing layer N1 and a remaining effective moisture-absorbing layer N2. The first moisture-absorbing layer N1 corresponds to a predetermined maintenance cycle t1, and the remaining effective moisture-absorbing layer N2 corresponds to a reserved maintenance cycle t2. In other words, under normal operating conditions, the first moisture-absorbing layer N1 performs the main moisture absorption and drying function within the predetermined maintenance cycle t1. When the damp area of ​​the first moisture-absorbing layer N1 reaches the location of the detection structure 100, the detection structure 100 outputs a moisture signal, while the remaining effective moisture-absorbing layer N2 continues to dry the gas flowing out of the desiccant container 200 within the reserved maintenance cycle t2.

[0037] In this embodiment, the detection structure 100 is used to detect a moisture signal. The moisture signal can manifest as a change in the color of the detection agent, a change in the humidity indicator value, a change in the color of the viewing window, a mechanical displacement signal, or other signals that characterize the degree of moisture absorption of the first absorbent layer N1. By positioning the detection structure 100 above the desiccant container 200 and maintaining a remaining effective absorbent layer N2 between the detection structure 100 and the top of the desiccant container 200, the problem of moisture penetration immediately after the detection structure 100 detects a moisture signal can be avoided. Therefore, even after observing a moisture signal, the operator still has a maintenance buffer time corresponding to the maintenance cycle t2.

[0038] Furthermore, the height of the first moisture-absorbing layer N1 is H1, and the height of the remaining effective moisture-absorbing layer N2 is H2. Since the first moisture-absorbing layer N1 corresponds to a predetermined maintenance cycle t1, and the remaining effective moisture-absorbing layer N2 corresponds to a reserved maintenance cycle t2, H1 and H2 are not arbitrarily set, but need to be matched in conjunction with the predetermined maintenance cycle t1, the reserved maintenance cycle t2, and the moisture absorption characteristics of the desiccant layer. Specifically, the height H1 of the first moisture-absorbing layer N1 and the height H2 of the remaining effective moisture-absorbing layer N2 satisfy: Where β is a reserved correction factor selected based on the moisture absorption capacity, particle size, bulk density, gas flow rate and storage tank operating environment of different desiccants.

[0039] In the above formula, t1 represents the time it takes for the moisture front to advance from the starting point of the first moisture-absorbing layer N1 to the location of the detection structure 100 under normal maintenance strategy; t2 represents the reserved maintenance cycle after the detection structure 100 outputs a moisture signal, allowing personnel to perform maintenance. β is used to correct for differences in dynamic moisture absorption capacity, moisture absorption rate, mass transfer zone width, and durability among different desiccants. When a certain type of desiccant has a wide moisture absorption front, its remaining moisture absorption capacity decays rapidly, or the humidity of the operating environment fluctuates greatly, β can be appropriately increased to improve the safety margin of the remaining effective moisture-absorbing layer N2; when a certain type of desiccant has a steep moisture absorption front and stable moisture absorption performance, β can be appropriately decreased to avoid setting the remaining effective moisture-absorbing layer N2 too thick, thereby reducing the utilization rate of the first moisture-absorbing layer N1.

[0040] In one embodiment, let the effective height of the desiccant layer be H, then H = H1 + H2. From... It can be seen that, given a fixed total height H, the height H2 of the remaining effective moisture-absorbing layer N2 should at least satisfy the following: , The larger β is, the thicker the remaining effective moisture-absorbing layer N2 that the desiccant needs to retain under the same reserved maintenance time.

[0041] In this embodiment, the effective height of the desiccant layer H = 500 mm. The time t1 corresponding to the advancement of the moisture front to the test filter element is 150 days. Therefore, by simply changing the type of desiccant and the reserved maintenance time t2, a clear comparison can be achieved.

[0042] When using 4A molecular sieve as the desiccant, the moisture absorption front of 4A molecular sieve is relatively steep, preferably β=1.05. In this case, when t2=15 days: , When t2 = 30 days: H2 ≈ 86.8 mm.

[0043] When t2 = 45 days: H2 ≈ 119.8 mm.

[0044] When the desiccant is 4A molecular sieve, the detection filter element can be placed relatively close to the top. Under the conditions of H=500mm and t1=150 days, if the reserved maintenance time t2 is 30 days, the distance H2 between the detection filter element and the top is preferably 80mm~90mm.

[0045] When silica gel is used as the desiccant, it has a strong moisture absorption capacity, but the mass transfer zone is relatively wide. It is preferable to take β=1.10. At this time, when t2=15 days: H2≈49.5mm.

[0046] When t2 = 30 days: H2 ≈ 90.2 mm.

[0047] When t2 = 45 days: H2 ≈ 124.1 mm.

[0048] When silica gel is used as the desiccant, under the conditions of H=500mm and t1=150 days, if the reserved maintenance time t2 is 30 days, the distance H2 from the top of the filter element is preferably 85mm to 95mm.

[0049] When activated alumina is used as the desiccant, the reserved layer of activated alumina should be appropriately thickened, preferably β=1.35. In this case, when t2=15 days: H2≈59.5mm.

[0050] When t2 = 30 days: H2 ≈ 106.3 mm.

[0051] When t2 = 45 days: H2 ≈ 144.1 mm.

[0052] When the desiccant is activated alumina, under the conditions of H=500mm and t1=150 days, if the reserved maintenance time t2 is 30 days, the distance H2 from the top of the filter element is preferably 100mm to 110mm.

[0053] Example 2, refer to Figure 2This embodiment further defines the detection structure 100 based on Embodiment 1, including an outer cylinder 101 and an external hole 102 disposed on the surface of the outer cylinder 101. The outer cylinder 101 is vertically disposed inside the desiccant container 200. Preferably, the outer cylinder 101 extends radially outward along the desiccant container 200, such that the axis of the outer cylinder 101 intersects the axis of the desiccant container 200. With this arrangement, a portion of the outer cylinder 101 is located inside the desiccant container 200, and another portion is located outside the desiccant container 200, which allows for contact with the first moisture-absorbing layer N1 and facilitates observation, disassembly, and maintenance by personnel from outside the container.

[0054] An outer hole 102 is perpendicularly disposed on the surface of the outer cylinder 101, and the axis of the outer hole 102 intersects the axis of the outer cylinder 101. The outer hole 102 penetrates the cylinder wall radially along the outer cylinder 101 to form a channel, allowing gas and moisture exchange between the interior of the outer cylinder 101 and the external first moisture-absorbing layer N1. The presence of the outer hole 102 prevents the outer cylinder 101 from being a completely closed blind cavity, instead forming a set of sampling windows that can transmit information about the localized moisture absorption of the first moisture-absorbing layer N1 to the interior of the detection structure 100. By setting the outer hole 102 as a perforation intersecting the axis of the outer cylinder 101, gas or moisture can enter the interior of the outer cylinder 101 more fully, thereby improving detection sensitivity.

[0055] In this embodiment, the outer cylinder 101 is vertically disposed on the surface of the desiccant container 200, and the axis of the outer cylinder 101 intersects the axis of the desiccant container 200, thereby extending the outer cylinder 101 along the radial direction of the desiccant container 200. This arrangement ensures that the end of the outer cylinder 101 inserted into the desiccant container 200 remains at a predetermined detection position, preventing the outer cylinder 101 from tilting relative to the desiccant container 200. If the end of the outer cylinder 101 inserted into the desiccant container 200 tilts upwards or downwards, the detection position of the outer cylinder 101 will deviate from the predetermined height, resulting in a moisture signal appearing too early or too late. If the end of the outer cylinder 101 inserted into the desiccant container 200 is tilted away from the axis of the desiccant container 200, the outer cylinder 101 will deviate from the axial region of the desiccant container 200. Since the desiccant layer usually gets damp closer to the axial region and then closer to the outer periphery, there may be a situation where the desiccant in the axial region has become damp but the outer cylinder 101 has not yet detected a moisture signal, thus affecting the accuracy of the detection results.

[0056] Example 3, referring to Figure 3This embodiment further defines the detection structure 100 based on Embodiment 2, including an inner cylinder 103 disposed within the outer cylinder 101, and an inner hole 104 disposed on the surface of the inner cylinder 103. The inner cylinder 103 is preferably coaxially arranged with the outer cylinder 101, forming a double-cylinder sleeve structure where the outer cylinder 101 covers the inner cylinder 103. By providing the inner cylinder 103, a transition space can be formed between the outer cylinder 101 and the inner cylinder 103, facilitating the replacement of the inner cylinder 103.

[0057] The inner hole 104 is vertically disposed on the surface of the inner cylinder 103, and the axis of the inner hole 104 intersects the axis of the inner cylinder 103. That is, the inner hole 104 is also radially inserted into the inner cylinder 103 to allow the detection reagent inside the inner cylinder 103 to come into contact with the humid gas introduced through the outer cylinder 101. When the first moisture-absorbing layer N1 has not yet become damp to the detection position, the gas entering through the outer hole 102 and the inner hole 104 still maintains a low humidity, and the detection reagent inside the inner cylinder 103 maintains its original state; when the moisture front moves upward to the area where the detection structure 100 is located, the humidity of the gas entering through the outer hole 102 and the inner hole 104 increases, and the detection reagent inside the inner cylinder 103 changes color or state accordingly, thereby forming a visual moisture signal.

[0058] The cooperation between the outer cylinder 101 and the inner cylinder 103 prevents the detection agent from directly spilling into the first moisture-absorbing layer N1, while also improving the detachability of the detection component. Specifically, the inner cylinder 103 can be installed as an independent component inside the outer cylinder 101. When maintenance is required, simply open the external connection structure and remove the inner cylinder 103 as a whole to replace the detection agent or handle internal components without having to completely dismantle the fixed connection between the outer cylinder 101 and the desiccant container 200. This separate inner and outer cylinder design balances detection stability and ease of maintenance.

[0059] In this embodiment, the gap between the inner cylinder 103 and the outer cylinder 101 is preferably controlled within a range that ensures smooth insertion without significant shaking. If the gap is too small, it can easily cause assembly obstruction and difficulty in disassembly; if the gap is too large, it may lead to a decrease in the alignment accuracy of the inner hole 104 and the outer hole 102, thereby affecting the consistency of the inspection. Therefore, it is necessary to retain the necessary assembly allowance between the inner and outer cylinders while also taking into account the coaxial positioning requirements.

[0060] In this embodiment, the diameter of the outer cylinder 101 is preferably one-fifth of the diameter of the desiccant container 200, the diameter of the outer hole 102 is preferably one-half of the diameter of the outer cylinder 101, and the inner hole 104 is the same size as the outer hole 102.

[0061] Specifically, the diameter of the outer cylinder 101 is set to one-fifth of the diameter of the desiccant container 200, achieving a good balance between detection sensitivity, detection buffering capacity, and overall structural reliability. If the diameter of the outer cylinder 101 is too small, the amount of detection reagent that can be contained in the outer cylinder 101 and its inner cylinder 103 will be relatively small. After moisture enters through the outer hole 102 and the inner hole 104, the internal detection reagent is more likely to undergo a moisture reaction in a short time, resulting in the detection structure 100 being overly sensitive to moisture and the damp signal appearing too early, which is not conducive to accurately reflecting the overall moisture state of the first moisture-absorbing layer N1. In other words, if the diameter of the outer cylinder 101 is too small, the buffering capacity of the detection reagent inside the detection structure 100 will be insufficient, and a damp signal will be issued prematurely before the first moisture-absorbing layer N1 has reached the expected level of moisture absorption. Conversely, when the diameter of the outer cylinder 101 is too large, although it can increase the capacity of the internal detection agent and delay the appearance of the moisture signal, since the outer cylinder 101 is an additional structure vertically set on the surface of the desiccant container 200, its size will correspondingly increase the local opening area and the surrounding stress area of ​​the desiccant container 200, thereby causing a decrease in the local structural strength of the desiccant container 200. At the same time, the increased stress area and overhang of the outer cylinder 101 in the radial direction will make it more prone to radial deformation, which will affect the fitting accuracy between the outer cylinder 101 and the inner cylinder 103 and the correspondence between the outer hole 102 and the inner hole 104, which is not conducive to the stable operation of the detection structure 100.

[0062] While keeping the diameter of the desiccant container 200, the container wall thickness, the wall thickness of the outer cylinder 101, the distribution of the outer hole 102, the distribution of the inner hole 104, and the operating conditions unchanged, the simulation results are shown in Table 1, with the evaluation indicators being "the time for the internal detection agent to reach the humidity signal threshold", "the local maximum equivalent stress of the desiccant container 200", and "the maximum radial deformation of the outer cylinder 101".

[0063]

[0064] Table 1 shows an example of parametric simulation data for the outer cylinder diameter ratio: In a specific example, when the diameter of the desiccant container 200 is 300 mm, the diameter of the outer cylinder 101 is preferably 60 mm, which is one-fifth of the diameter of the desiccant container 200. As shown in Table 1, when the diameter of the outer cylinder 101 is less than one-fifth of the diameter of the desiccant container 200, the time it takes for the internal detection agent to reach the moisture signal threshold is significantly shortened, indicating that the detection structure 100 is too sensitive to moisture and is prone to premature moisture signals. When the diameter of the outer cylinder 101 is greater than one-fifth of the diameter of the desiccant container 200, although the moisture signal appears later, the local maximum equivalent stress of the desiccant container 200 and the maximum radial deformation of the outer cylinder 101 are significantly increased, which is detrimental to structural stability. A comprehensive comparison shows that when the diameter of the outer cylinder 101 is one-fifth of the diameter of the desiccant container 200, a better balance is achieved between detection sensitivity, detection buffering capacity, and structural reliability; therefore, this ratio is preferred.

[0065] Furthermore, the diameter of the outer hole 102 is preferably half the diameter of the outer cylinder 101. The applicant conducted a parametric analysis of the diameter of the outer hole 102. While maintaining the overall dimensions of the outer cylinder 101, the hole distribution, and the internal detection components, the applicant compared the moisture signal response speed, local strength at the hole edge, and overall stability corresponding to different hole diameters. The results show that when the diameter of the outer hole 102 is too small, the moisture exchange rate between the inside and outside of the outer cylinder 101 is slow, and the transmission of the moisture signal to the inner cylinder 103 is delayed, easily leading to a late detection signal. When the diameter of the outer hole 102 is too large, although the moisture signal transmission speed is improved, it significantly weakens the structural strength of the local wall of the outer cylinder 101, which is detrimental to the stable installation and long-term use of the outer cylinder 101. Setting the diameter of the outer hole 102 to half the diameter of the outer cylinder 101 achieves a better balance between the moisture signal transmission speed and the structural strength of the outer cylinder 101.

[0066] In a specific example, when the diameter of the outer cylinder 101 is 60mm, the applicant conducted parametric simulation analysis with the diameters of the outer holes 102 being 18mm, 20mm, 22mm, 24mm, 26mm, 28mm, 30mm, 32mm, 35mm, and 38mm, respectively. While keeping the overall dimensions of the outer cylinder 101, wall thickness, arrangement of the outer holes 102, arrangement of the inner holes 104, and operating conditions constant, the simulation results are shown in Table 2, using "humidity signal transmission response time," "maximum equivalent stress at the hole edge," and "maximum local deformation of the outer cylinder 101" as evaluation indicators.

[0067] Table 2 shows the parametric simulation analysis data for the outer hole diameter:

[0068] As shown in Table 2, when the diameter of the outer hole 102 is less than 24 mm, the response time for moisture signal transmission is significantly longer, indicating that the exchange of moisture inside and outside the outer cylinder 101 is slow, and there is a significant lag in moisture signal transmission. When the diameter of the outer hole 102 is greater than 32 mm, although the response time for moisture signal transmission is further shortened, the maximum equivalent stress at the hole edge and the maximum local deformation of the outer cylinder 101 are significantly increased, indicating that the local structural strength of the outer cylinder 101 decreases and its stability deteriorates. A comprehensive comparison shows that when the diameter of the outer hole 102 is between 28 mm and 30 mm, a better balance is achieved between the moisture signal transmission speed, the local strength at the hole edge, and the local deformation of the outer cylinder 101, with 30 mm showing the best overall performance. Therefore, in this embodiment, the diameter of the outer hole 102 is preferably set to half the diameter of the outer cylinder 101.

[0069] Furthermore, the inner hole 104 and the outer hole 102 are the same size. This arrangement ensures that the moisture signal, after entering through the outer hole 102 and then through the inner hole 104 into the inner cylinder 103, maintains a relatively consistent flow cross-section, avoiding localized flow obstruction due to abrupt changes in orifice diameter and thus reducing signal transmission delay. On the other hand, because the inner hole 104 and the outer hole 102 are the same size and are coaxially aligned, the moisture signal can enter the inner cylinder 103 along a relatively straight path, improving the consistency and symmetry of the detection pathway, thereby enhancing the accuracy and stability of the detection results.

[0070] Therefore, by setting the diameter of the outer cylinder 101 to one-fifth of the diameter of the desiccant container 200, setting the diameter of the outer hole 102 to one-half of the diameter of the outer cylinder 101, and making the inner hole 104 the same size as the outer hole 102, it is possible not only to ensure that the detection structure 100 has good structural strength and assembly feasibility, but also to ensure that the moisture signal is transmitted to the inner cylinder 103 in a timely and stable manner, thereby improving the accuracy of the detection filter element in detecting the moisture status of the first moisture-absorbing layer N1.

[0071] Example 4, refer to Figure 4 This embodiment further defines, based on Embodiment 2 or Embodiment 3, that there are multiple outer holes 102, which are arranged at equal intervals along the axis of the outer cylinder 101. Preferably, the multiple outer holes 102 are located on the second opening section of the outer cylinder 101 inside the desiccant container 200, thereby covering different positions in the radial direction of the desiccant container 200. Since the first moisture-absorbing layer N1 usually gradually forms moisture changes radially or locally in actual operation, setting a single outer hole 102 at only one fixed point can easily cause sampling distortion, while the equal distribution of multiple outer holes 102 can improve the representativeness of the locally damp areas.

[0072] Furthermore, the edge of the outer hole 102 closest to the axis of the desiccant container 200 is arranged adjacent to the axis of the desiccant container 200, and the edge of the outer hole 102 closest to the side wall of the desiccant container 200 is arranged adjacent to the side wall of the desiccant container 200, so that the multiple outer holes 102 basically cover the effective detection range of the desiccant container 200 along the radial direction.

[0073] This arrangement ensures that the external holes 102 are equidistantly distributed within the radius of the desiccant container 200. This means that the detection structure 100 can simultaneously sense different local humidity states from the side closest to the container axis to the side closest to the container sidewall, reducing detection bias caused by uneven local flow fields or differences in packing accumulation. Especially in breathable drying applications, the degree of gas influence on different areas of the first moisture-absorbing layer N1 may not be completely consistent. The equidistant distribution of multiple external holes 102 can improve the representativeness and reliability of the humidity signal output by the detection structure 100.

[0074] The equidistant coverage of multiple external holes 102 in the radial direction can also take into account detection deviations caused by uneven desiccant packing density, local collapse, or local bridging. When the desiccant in a certain local area becomes damp quickly, the external hole 102 at the corresponding position can detect the moisture change first; while the external holes 102 at other positions can still provide supplementary information, so that the humidity signal output by the detection structure 100 is closer to the overall true state.

[0075] This embodiment further explains the distribution of the external holes 102 and their detection function.

[0076] In this embodiment, there are multiple outer holes 102, which are arranged at equal intervals along the axis of the outer cylinder 101. The edge of the outer hole 102 closest to the axis of the desiccant container 200 is located adjacent to the axis of the desiccant container 200, and the edge of the outer hole 102 closest to the side wall of the desiccant container 200 is located adjacent to the side wall of the desiccant container 200, so that the multiple outer holes 102 are equidistantly distributed within the radius of the desiccant container 200.

[0077] With the above arrangement, the multiple external holes 102 can each correspond to different positions along the radius of the desiccant container 200, thus enabling the detection structure 100 to not only detect whether a moisture signal is present, but also reflect the moisture distribution state of the desiccant container 200 along the radial direction. Normally, the first moisture-absorbing layer N1 inside the desiccant container 200 does not become damp all at once; rather, the area near the axis of the desiccant container 200 becomes damp faster, while the area near the edge of the desiccant container 200 becomes damp relatively slower. Therefore, when the multiple external holes 102 are equidistantly distributed along the radial direction of the desiccant container 200, the external holes 102 located near the axis will preferentially sense the moisture signal, while the external holes 102 located near the sidewall will sense the moisture signal relatively later.

[0078] Furthermore, when the inner cylinder 103 is equipped with a detection agent capable of characterizing the moisture state, such as a color-changing detection agent or other visual indicator, the detection agent connected to the corresponding area of ​​each outer hole 102 will exhibit different degrees of moisture changes because the degree of moisture varies at different locations of the outer hole 102. Specifically, the detection agent closer to the axis of the desiccant container 200 has a higher degree of moisture, while the detection agent farther from the axis of the desiccant container 200 has a lower degree of moisture, thus forming a moisture indication curve or a gradual distribution state that changes from high to low along the axis of the outer cylinder 101.

[0079] By observing the moisture indicator curve or gradual distribution pattern, operators can more intuitively determine the extent to which moisture spreads outward from the central area of ​​the desiccant container 200, thereby reflecting the moisture height and gradient changes in the central area inside the desiccant container 200. Compared to methods that only have a single detection hole, this embodiment uses multiple external holes 102 equidistantly distributed in the radial direction, so that the detection results are no longer limited to a single-point signal, but can form a distributed characterization of the moisture state inside the desiccant container 200, thereby improving the intuitiveness and accuracy of judging the moisture state of the first moisture-absorbing layer N1.

[0080] Furthermore, the multiple external holes 102 are equidistantly distributed within the radius of the desiccant container 200, which can avoid the random errors caused by the detection positions being too concentrated in a single area. Even if a local area becomes damp first due to airflow fluctuations, differences in packing density, or uneven distribution of desiccant particles, the difference in dampness at multiple detection positions can be used to make a comprehensive judgment, thereby making the detection results more representative.

[0081] Therefore, in this embodiment, by equidistantly distributing multiple external holes 102 along the radius of the desiccant container 200, and ensuring that the detector on the side closer to the axis is more damp and the detector on the side farther from the axis is less damp, a gradual dampness indicator curve can be formed. This enables an intuitive representation of the dampness status of the central region inside the desiccant container 200, improving the accuracy and visualization of the detection structure 100 in detecting the dampness distribution of the first moisture-absorbing layer N1.

[0082] Example 5, refer to Figure 3 and Figure 4This embodiment further defines the concept based on Embodiment 3, wherein there are multiple inner holes 104, which are arranged at equal intervals along the axis of the inner cylinder 103. The distance between adjacent inner holes 104 is the same as the distance between adjacent outer holes 102, and each inner hole 104 corresponds one-to-one with the corresponding outer hole 102 and is coaxially arranged. With this arrangement, the outer holes 102 and inner holes 104 form paired radial passages after assembly, which allows the moisture changes in the first moisture-absorbing layer N1 outside the outer cylinder 101 to act on the detection agent inside the inner cylinder 103 through a shorter and more consistent path.

[0083] In this embodiment, the one-to-one correspondence and coaxial arrangement are not merely for geometric neatness, but directly related to detection sensitivity and consistency. If there is a significant misalignment between the inner hole 104 and the outer hole 102, some of the gas entering the outer cylinder 101 will need to flow around between the outer cylinder 101 and the inner cylinder 103 before entering the inner cylinder 103. This will result in different detection gas path lengths at different locations, leading to asynchronous responses of the detection agent to each hole. By arranging each inner hole 104 coaxially with its corresponding outer hole 102, the path length, local resistance, and exchange efficiency of multiple detection channels can be kept relatively consistent, thereby ensuring a more balanced distribution of moisture information received by the detection agent inside the inner cylinder 103.

[0084] Furthermore, the spacing between adjacent inner holes 104 is the same as the spacing between adjacent outer holes 102, which facilitates batch processing and assembly positioning. During production, holes can be machined at a uniform pitch on the corresponding opening sections of the outer cylinder 101 and inner cylinder 103, and then automatic alignment of the inner and outer holes can be achieved through length matching and end positioning. This not only reduces manufacturing difficulty but also makes the coaxial calibration after assembly highly repeatable, providing a foundation for subsequent control of the hole alignment relationship through dimensional parameters L1, L2, L3 and L4, L5, L6.

[0085] With the inner hole 104 and outer hole 102 arranged coaxially in a one-to-one correspondence, the resistance encountered by the humid airflow entering the inner cylinder 103 is more consistent, which is particularly advantageous for using color-changing detection reagents. If the force on each detection channel is uneven, the reagent will change color locally first, easily leading to misjudgment by the operator; however, under coaxial and consistent channel conditions, the change in the reagent's state is usually more uniform, making it easier to observe and judge.

[0086] Example 6, refer to Figure 5 and Figure 6This embodiment further defines the features based on Embodiment 3 or Embodiment 5. A first cap 105 is provided at one end of the inner cylinder 103, and a second cap 106 is provided at the other end. The first cap 105 has a through rod 105a, one end of which extends to the outside of the inner cylinder 103 and forms a male part 105b. The second cap 106 has a female part 106a that mates with the male part 105b. Preferably, the male part 105b has an external thread structure, and the female part 106a has an internal thread structure that mates with it, thereby pressing the second cap 106 together by screwing.

[0087] By providing a first cap 105 and a second cap 106 at both ends of the inner cylinder 103, a relatively independent containing space can be formed inside the inner cylinder 103 for holding the detection reagent and the inner mesh 103a. The through rod 105a serves both as a connector and a force transmitter. When the female part 106a on the second cap 106 is rotated, the second cap 106 can move along the through rod 105a toward the first cap 105, thereby clamping the inner cylinder 103, the inner mesh 103a, and the detection reagent between the two caps. This structure can prevent the detection reagent from spilling and allows the inner cylinder 103 to be used as a modular unit that can be disassembled and reassembled as a whole.

[0088] Furthermore, with the through rod 105a extending to the outside of the inner cylinder 103 and equipped with a handle or screwing part, workers can directly grasp or apply force during disassembly and assembly without the need for additional complex tools to loosen or tighten the second cover 106. The detachable connection between the male part 105b and the female part 106a also allows for convenient replacement of the detection reagent, cleaning of the inner screen 103a, or replacement of the damaged second cover 106 after long-term use of the filter element, significantly improving maintenance efficiency and reusability.

[0089] The first cap 105 and the second cap 106 not only serve a sealing function, but also provide axial positioning for the through rod 105a, the detection agent, the inner mesh 103a, and the inner cylinder 103. By arranging the through rod 105a in the center, the force during screwing or disassembly can be more evenly distributed, preventing local warping of the cap and thus improving the connection stability between the cap and the inner cylinder 103.

[0090] Example 7, referring to Figure 4 and Figure 6This embodiment further defines the features of Embodiment 6 by providing a connector 107 at one end of the outer cylinder 101. A closed continuous contact surface O is formed between the first cover 105 and the connector 107. A first groove 105c is formed on the end face of the first cover 105 at the continuous contact surface O. Preferably, the first groove 105c can be an annular groove or other groove form capable of forming a closed boundary. After a sealing gasket is provided in the groove, when the first cover 105 and the connector 107 are assembled, the sealing gasket is compressed and forms a stable seal along the continuous contact surface O.

[0091] In this context, "closed" in the continuous closed contact surface O means that the contact surface O forms a complete boundary in the circumferential direction, preventing outside air from entering the inner cylinder 103 through any unpressurized gaps; "continuous" in the continuous closed contact surface O means that the contact surface O is not interrupted, so that the sealing gasket can be uniformly stressed along the entire boundary after being compressed. The first groove 105c is formed at the continuous contact surface O, so that the sealing gasket can be effectively positioned and to avoid displacement, overturning, or local extrusion during assembly.

[0092] Through the fit between the first cap 105 and the connector 107, outside air cannot directly enter the inner cylinder 103 through the contact area between the first cap 105 and the connector 107. Therefore, humid gas entering the inner cylinder 103 is mainly introduced through the outer hole 102 and the inner hole 104. This is crucial for detection accuracy, because if outside air bypasses the outer hole 102 and the inner hole 104 and directly enters the inner cylinder 103 through the contact gap, it will disrupt the consistency of the detection path, causing the detection reagent to be affected by an unrealistic environment. Therefore, in this embodiment, the connector 107, the continuous contact surface O, and the first groove 105c together constitute a reliable sealing connection structure.

[0093] When the continuous contact surface O is used in conjunction with the first groove 105c, even if the filter element is subjected to certain external forces during transportation, installation, or vibration, the sealing gasket is still unlikely to slip out of the groove. Therefore, the first groove 105c not only improves static sealing performance but also enhances post-assembly resistance to disturbances, reducing the risk of outside air entering the inner cylinder 103 due to gasket displacement.

[0094] In this embodiment, the first groove 105c is used not only to accommodate and limit the sealing gasket, but also to control the thickness of the sealing gasket under pressure in the assembled state. Specifically, the groove depth of the first groove 105c is preferably set to correspond to the thickness of the sealing gasket after compression. When the first cover 105 and the connector 107 are fixed by bolts, the sealing gasket is pressed into the first groove 105c and compressed. The thickness of the compressed sealing gasket is adapted to the groove depth of the first groove 105c, so that the end face of the first cover 105 and the end of the outer cylinder 101 can form a stable fit.

[0095] By employing this design, the first groove 105c not only prevents the sealing gasket from shifting or being extruded during assembly, but also ensures a defined axial assembly position between the first cap 105 and the outer cylinder 101 by limiting the compression of the sealing gasket. Thus, after the inner cylinder 103 is inserted into the outer cylinder 101 and assembly is completed, the relative axial position between the inner cylinder 103 and the outer cylinder 101 can be stably defined, thereby ensuring that the subsequent dimensional relationship L1=L4 can be achieved in the actual assembly state.

[0096] Furthermore, since L1=L4 represents the axial correspondence between the inner cylinder 103 and the outer cylinder 101 relative to their respective end reference surfaces, the assembly references of the inner cylinder 103 and the outer cylinder 101 are only consistent when the end face of the first cover 105 and the end of the outer cylinder 101 form a stable fit. This ensures that the outer hole 102 and the inner hole 104 remain aligned after assembly. If the first groove 105c is not provided, and a sealing gasket is directly installed between the first cover 105 and the connector 107, the sealing gasket itself has a certain thickness, and its thickness is not easily controlled under pressure. Even if L1=L4 is met in the design dimensions, the sealing gasket may cause an additional axial gap or offset between the first cover 105 and the connector 107, which may lead to misalignment of the inner cylinder 103 and the outer cylinder 101 after assembly, making it impossible for the outer hole 102 and the inner hole 104 to be accurately aligned.

[0097] Therefore, in this embodiment, by opening a first groove 105c on the end face of the first cover 105 and making the thickness of the sealing gasket after being compressed match the groove depth of the first groove 105c, not only can a reliable seal be achieved, but also the fit between the end face of the first cover 105 and the end of the outer cylinder 101 can be guaranteed, thereby providing a stable reference for the axial positioning of the inner cylinder 103 and the outer cylinder 101, and thus ensuring the accurate alignment of the outer hole 102 and the inner hole 104.

[0098] Example 8, referring to Figure 5 and Figure 7 This embodiment further defines the features of Embodiment 7 by providing an inner mesh 103a inside the inner cylinder 103 and a second groove 106b on the end face of the second cover 106. The second groove 106b includes a side surface M1 and a bottom surface M2, wherein the side surface M1 is in close contact with the inner mesh 103a, and the bottom surface M2 is in close contact with the end of the inner cylinder 103. The inner mesh 103a is preferably a cylindrical mesh with a diameter smaller than the inner diameter of the inner cylinder 103, which can be inserted into the inner cylinder 103 to contain the detection reagent, preventing the detection reagent particles from directly clogging the inner hole 104 or being lost during disassembly and assembly.

[0099] The second groove 106b not only seals the end of the second cover 106, but also provides dual positioning for the ends of the inner mesh 103a and the inner cylinder 103. Specifically, the groove side surface M1 gradually engages with the end or outer periphery of the inner mesh 103a during the tightening process of the second cover 106, preventing axial movement of the inner mesh 103a; the groove bottom surface M2 abuts against the end of the inner cylinder 103, forming a termination interface for the pressing position of the second cover 106. In this way, when the second cover 106 is tightened with the male part 105b via the female part 106a, it can achieve stable positioning of the inner mesh 103a and ensure that the pressing stroke of the second cover 106 is controllable.

[0100] Example 9, referring to Figure 8 and Figure 9 This embodiment further defines the inner cylinder 103 based on embodiments 3, 5, 7, or 8, including a first outer extension, a first opening, and a first inner extension, with lengths L1, L2, and L3 along the axial direction of the inner cylinder 103, respectively; and an outer cylinder 101 including a second outer extension, a second opening, and a second inner extension, with lengths L4, L5, and L6 along the axial direction of the outer cylinder 101, respectively. Wherein, L1 = L4, L2 = L5, L3 < L6, and L2 and L5 are both equal to the radius of the desiccant container 200.

[0101] The design of L1=L4 and L2=L5 ensures that the inner cylinder 103 and the outer cylinder 101 can form a corresponding relationship in the two regions of the outer extension section and the opening section when they are installed, thereby ensuring the accurate alignment of the outer hole 102 and the inner hole 104.

[0102] If L3 is less than L6, it means that the inner cylinder 103 has a shorter first inner extension relative to the outer cylinder 101 in the direction of the desiccant container 200. This arrangement provides assembly space for the mother component 106a.

[0103] Example 10 further specifies that, based on the previous examples, both the first moisture-absorbing layer N1 and the remaining effective moisture-absorbing layer N2 are formed by filling with 4A molecular sieve particles. That is, the detection structure 100 does not simply separate two completely different desiccant materials, but rather forms a continuous 4A molecular sieve filling layer within the same desiccant container 200. The detection structure 100 then divides this 4A molecular sieve filling layer into a lower or inlet-side first moisture-absorbing layer N1, and an upper or outlet-side remaining effective moisture-absorbing layer N2.

[0104] 4A molecular sieve particles exhibit good selective adsorption capacity for moisture and have a stable particle structure, making them suitable for deep drying of air entering storage tanks in breathing systems. When both the first moisture-absorbing layer N1 and the remaining effective moisture-absorbing layer N2 are made of 4A molecular sieve particles, the desiccant materials on both sides of the detection structure 100 have consistent moisture absorption characteristics, reducing problems such as abrupt changes in moisture absorption rate, discontinuities in the moisture front, or unstable detection results caused by differences in the materials of the upper and lower layers. Therefore, the proportional relationship between the height H1 of the first moisture-absorbing layer N1 and the height H2 of the remaining effective moisture-absorbing layer N2 can more stably correspond to the predetermined maintenance cycle t1 and the reserved maintenance cycle t2.

[0105] Furthermore, since both the first moisture-absorbing layer N1 and the remaining effective moisture-absorbing layer N2 are formed by filling 4A molecular sieve particles, β can be selected based on the moisture absorption capacity, particle size, bulk density, gas flow rate, and tank operating environment of the 4A molecular sieve particles. For 4A molecular sieve particles with a relatively steep moisture absorption front and stable moisture absorption performance, β can preferably be selected as 1.05 or a value close to 1. This ensures sufficient drying capacity within the reserved maintenance cycle t2 while avoiding excessive thickness of the remaining effective moisture-absorbing layer N2, which would reduce the effective utilization height of the first moisture-absorbing layer N1.

[0106] With the above structure, when the first moisture-absorbing layer N1 gradually becomes damp and the detection structure 100 outputs a moisture signal, the remaining effective moisture-absorbing layer N2 is still composed of the same type of 4A molecular sieve particles, and can continue to stably absorb moisture from the gas flowing out of the desiccant container 200. Therefore, this embodiment can further improve the moisture absorption stability, maintenance reliability, and material consistency of the detection filter element in the tank breathing drying scenario.

[0107] Example 11, referring to Figures 1-9 This embodiment provides a method for assembling a test filter element, which includes an outer cylinder welding and fixing step, an inner cylinder assembly manufacturing step, and a final assembly step. Unlike simply embedding the test element directly into the container wall, the process of this embodiment is as follows: first, the outer cylinder 101, which serves as the fixing base and the outer shell of the test channel, is permanently welded and fixed to the desiccant container 200; then, the inner cylinder 103 assembly, which serves as a maintainable component, is inserted into the outer cylinder 101 and fixedly connected to the outer cylinder 101 in a detachable manner, thereby forming a double-layer maintenance structure that is externally fixed and internally replaceable.

[0108] In the outer cylinder welding and fixing step, the outer cylinder 101 is fixed to the surface of the desiccant container 200 by welding. This connection usually does not require repeated disassembly during later maintenance, so welding is suitable to improve connection strength, sealing, and durability. In the inner cylinder assembly manufacturing step, the inner cylinder 103, the first cap 105, the second cap 106, the inner mesh 103a, and the detection agent together form an independently handleable assembly. In the final assembly step, the inner cylinder 103 assembly is inserted into the outer cylinder 101 and detachably fixed. When the detection agent fails or maintenance is required, the operator only needs to remove the external fasteners to remove the inner cylinder 103 assembly as a whole without damaging the welded connection between the outer cylinder 101 and the desiccant container 200.

[0109] Example 12 focuses on the welding and fixing steps of the outer cylinder 101. First, a first cylinder is selected to form the outer cylinder 101. A circular plate is welded to one end of the first cylinder to seal that end. The circular plate can be circumferentially welded to the end face of the first cylinder to form a stable closed-end structure. The presence of the closed end allows for the formation of a controlled detection channel inside the outer cylinder 101 and also provides end strength support for the subsequent insertion of the desiccant container 200.

[0110] Subsequently, a connector 107 is welded to the outer circumferential surface of the other end of the first cylinder. The connector 107 is used to form a detachable connection with the first cover 105. Preferably, the connector 107 can be an annular connecting flange with bolt holes on its outer circumference, so that the first cover 105 can be subsequently tightened and fixed by bolts. Next, multiple external holes 102 are opened perpendicular to the axis of the first cylinder in the second opening section. The opening position and pitch of the external holes 102 can be determined according to the length of the second opening section and the designed detection range to ensure that they cover the effective radial area of ​​the desiccant container 200.

[0111] Subsequently, a mounting hole adapted to the first cylinder is made on the surface of the desiccant container 200, below the remaining effective moisture-absorbing layer N2. The end with the circular plate is inserted into the mounting hole, so that the axis of the first cylinder intersects the axis of the desiccant container 200, and the second outer extension is located outside the desiccant container 200, while the second opening section is located inside the desiccant container 200. Finally, it is welded and fixed at the mounting hole. Through this process, the outer cylinder 101 becomes a detection mounting base permanently fixed on the desiccant container 200, and is not disassembled with each maintenance, thereby improving the overall strength and long-term sealing reliability.

[0112] Example 13 focuses on the manufacturing steps of the inner cylinder 103. First, a second cylinder with a diameter smaller than the inner diameter of the first cylinder is selected to form the inner cylinder 103, ensuring that the inner cylinder 103 can be smoothly inserted into the outer cylinder 101, and maintaining a necessary assembly gap between the inner and outer cylinders. Then, a first cap 105 is welded to one end of the second cylinder. Since the first cap 105 subsequently serves both as a seal and as a bolt fixing component to the connector 107, welding is used to connect it to the second cylinder, resulting in higher strength and better sealing.

[0113] A first groove 105c is formed in the area where the end face of the first cover 105 overlaps with the connecting member 107, and a sealing gasket is installed in the first groove 105c. Next, a first through hole is formed at the center of the end face of the first cover 105, allowing a through rod 105a with a handle to pass through the first through hole and extend to the outside of the second cylinder. The handle is then welded to the first cover 105, and an external thread is provided at the end of the through rod 105a to form a male part 105b. Afterward, a second cover 106 is selected, a second groove 106b is formed on its end face, a second through hole is formed at the center, and a female part 106a that matches the male part 105b is fixed at the second through hole. In this way, the second cover 106 can achieve axial movement and locking through the threaded engagement of the female part 106a and the male part 105b.

[0114] Subsequently, an inner mesh 103a with a diameter smaller than the inner diameter of the second cylinder is selected and inserted into the second cylinder, and the detection reagent is loaded into the inner mesh 103a. Finally, the female part 106a on the second cap 106 is threadedly connected to the male part 105b on the through rod 105a until the bottom surface of the groove 106b contacts the end of the second cylinder, and the side surface of the groove 106b is in close contact with the inner mesh 103a. At this point, the inner cylinder 103 assembly is complete. This assembly can be used entirely by inserting it into the outer cylinder 101, or it can be removed and replaced entirely during maintenance, significantly reducing the workload required for replacing the detection reagent.

[0115] Example 14 focuses on the assembly steps between the inner cylinder 103 assembly and the outer cylinder 101. Specifically, the assembled inner cylinder 103 is inserted into the outer cylinder 101, ensuring that the sealing gasket in the first groove 105c is in close contact with the connector 107. Then, bolts are used to secure the first cover 105 and the connector 107 through the bolt holes on the first cover 105 and the connector 107. Since the bolt connection is detachable, after the testing agent reaches its service life, the operator can remove the entire inner cylinder 103 assembly by removing the bolts, while the outer cylinder 101 remains stationary.

[0116] This embodiment further illustrates the principle of automatic alignment of inner and outer holes. Since L1=L4 and L2=L5, and the outer hole 102 and inner hole 104 have the same diameter and the same spacing, when the inner cylinder 103 is inserted into the outer cylinder 101 according to the design direction and positioned and pressed by the first cap 105 and the connecting piece 107, the inner hole 104 and outer hole 102 can naturally form a one-to-one corresponding and coaxial assembly state. In other words, this invention does not rely on complex additional calibration mechanisms to achieve hole alignment; accurate hole position relationships can be obtained at the end of assembly simply through length matching and pitch matching.

[0117] In another embodiment, when the detection structure 100 detects a moisture signal, the operator can first disassemble the bolt connection between the first cover 105 and the connector 107, then pull the inner cylinder 103 assembly out of the outer cylinder 101 to replace or regenerate the detection agent inside the inner mesh 103a. After replacement, the inner cylinder 103 is reinstalled into the outer cylinder 101 according to the original assembly direction, and the sealing gasket in the first groove 105c is pressed and sealed again with the connector 107. Since the outer cylinder 101 body remains welded and fixed to the desiccant container 200, the maintenance process will not damage the main structure of the desiccant container 200, nor will it change the predetermined positional relationship between the detection structure 100 and the remaining effective moisture-absorbing layer N2.

[0118] Finally, it should be noted that the methods and devices described in detail above are merely embodiments, and those skilled in the art can modify these embodiments in different ways as long as they do not depart from the scope of the present invention.

Claims

1. A detection filter element for a drying device for storage tanks, characterized in that: include, The detection structure (100) is located at a predetermined distance from the top of the desiccant container (200) along the height direction of the desiccant container (200) and is used to detect a moisture signal; The detection structure (100) divides the desiccant layer in the desiccant container (200) into a first moisture-absorbing layer (N1) corresponding to a predetermined maintenance cycle t1, and a remaining effective moisture-absorbing layer (N2) corresponding to a reserved maintenance cycle t2. The first moisture-absorbing layer (N1) is located below the detection structure (100), and the remaining effective moisture-absorbing layer (N2) is located above the detection structure (100). The height H1 of the first moisture-absorbing layer (N1) and the height H2 of the remaining effective moisture-absorbing layer (N2) satisfy the following: β is a reserved correction factor selected based on the moisture absorption capacity, particle size, bulk density, gas flow rate, and operating environment of different desiccants.

2. The detection filter element of the drying device for storage tanks as described in claim 1, characterized in that: The detection structure (100) includes, An outer cylinder (101) is vertically disposed inside the desiccant container (200), and the axis of the outer cylinder (101) intersects the axis of the desiccant container (200); An outer hole (102) is perpendicularly disposed on the surface of the outer cylinder (101), and the axis of the outer hole (102) intersects the axis of the outer cylinder (101).

3. The detection filter element of the drying device for storage tanks as described in claim 2, characterized in that: The detection structure (100) also includes, The inner cylinder (103) is disposed inside the outer cylinder (101); An inner hole (104) is perpendicularly disposed on the surface of the inner cylinder (103), and the axis of the inner hole (104) intersects the axis of the inner cylinder (103).

4. The detection filter element of the drying device for storage tanks as described in claim 2 or 3, characterized in that: There are multiple outer holes (102), and the multiple outer holes (102) are arranged at equal intervals along the axis of the outer cylinder (101); The outer hole (102) closest to the axis of the desiccant container (200) is positioned adjacent to the axis of the desiccant container (200), and the outer hole (102) closest to the sidewall of the desiccant container (200) is positioned adjacent to the sidewall of the desiccant container (200), so that the multiple outer holes (102) are equidistantly distributed within the radius of the desiccant container (200).

5. The detection filter element of the drying device for storage tanks as described in claim 3, characterized in that: There are multiple inner holes (104), and the multiple inner holes (104) are arranged at equal intervals along the axis of the inner cylinder (103). The distance between adjacent inner holes (104) is the same as the distance between adjacent outer holes (102). Each of the inner holes (104) corresponds to the corresponding outer hole (102) and is coaxially arranged.

6. The detection filter element of the drying device for storage tanks as described in claim 3 or 5, characterized in that: One end of the inner cylinder (103) is provided with a first cap (105), and the other end of the inner cylinder (103) is provided with a second cap (106). The first cover (105) is provided with a through rod (105a), one end of which extends to the outside of the inner cylinder (103) and forms a male part (105b). The second cover (106) is provided with a female part (106a) that is compatible with the male part (105b).

7. The detection filter element of the drying device for storage tanks as described in claim 6, characterized in that: One end of the outer cylinder (101) is provided with a connector (107), and a closed continuous contact surface (O) is formed between the first cover (105) and the connector (107). A first groove (105c) is provided on the end face of the first cover (105), and the first groove (105c) is located at the continuous contact surface (O).

8. The detection filter element of the drying device for storage tanks as described in claim 7, characterized in that: An inner mesh (103a) is provided inside the inner cylinder (103), and a second groove (106b) is provided on the end face of the second cover (106). The second groove (106b) includes a groove side surface (M1) and a groove bottom surface (M2). The groove side surface (M1) is in close contact with the inner mesh (103a), and the groove bottom surface (M2) is in close contact with the end of the inner cylinder (103).

9. The detection filter element of the drying device for storage tanks as described in any one of claims 3, 5, 7, and 8, characterized in that: The inner cylinder (103) includes a first outer extension, a first opening section and a first inner extension, the lengths of the first outer extension, the first opening section and the first inner extension along the axial direction of the inner cylinder (103) are L1, L2 and L3 respectively; The outer cylinder (101) includes a second outer extension, a second opening section, and a second inner extension, the lengths of the second outer extension, the second opening section, and the second inner extension along the axial direction of the outer cylinder (101) are L4, L5, and L6, respectively; Where L1=L4, L2=L5, L3<L6, and L2 and L5 are both equal to the radius of the desiccant container (200).

10. The detection filter element of the drying device for storage tanks as described in any one of claims 1, 2, 3, 5, 7, and 8, characterized in that: Both the first moisture-absorbing layer (N1) and the remaining effective moisture-absorbing layer (N2) are formed by filling 4A molecular sieve particles.

11. A method for assembling a test filter element, characterized in that: The detection filter element applied to the tank drying apparatus as described in claim 9 further includes the following steps: The outer cylinder welding and fixing step involves manufacturing an outer cylinder (101) and welding and fixing the outer cylinder (101) to the surface of the desiccant container (200); The inner cylinder assembly manufacturing step involves manufacturing an inner cylinder (103) and filling the inner cylinder (103) with a detection agent to form an inner cylinder (103) assembly; In the final assembly step, the inner cylinder (103) assembly is inserted into the outer cylinder (101), and the inner cylinder (103) assembly is detachably fixed to the outer cylinder (101); The outer cylinder (101) is welded and fixed to the upper part of the desiccant container (200) so that a residual effective moisture-absorbing layer (N2) is formed between the detection structure (100) formed by the outer cylinder (101) and the top of the desiccant container (200). After the inner cylinder (103) assembly is installed into the outer cylinder (101), the inner hole (104) and the outer hole (102) correspond one-to-one and are coaxially arranged.

12. The assembly method of the test filter element as described in claim 11, characterized in that: The outer cylinder welding and fixing steps include: Select a first cylinder to form the outer cylinder (101), and weld a circular plate to one end of the first cylinder to seal one end of the first cylinder; A connector (107) is welded to the outer circumference of the other end of the first cylinder. Multiple external holes (102) are opened in the second opening section of the first cylinder perpendicular to the axis of the first cylinder. An assembly hole adapted to the first cylinder is provided on the surface of the desiccant container (200) below the remaining effective moisture-absorbing layer (N2); Insert the end of the first cylinder with the circular plate into the assembly hole, so that the axis of the first cylinder intersects the axis of the desiccant container (200), and the second extension section is located outside the desiccant container (200), and the second opening section is located inside the desiccant container (200); Welding is performed at the assembly hole for fixation.

13. The assembly method of the test filter element as described in claim 12, characterized in that: The manufacturing steps for the inner cylinder assembly include: The inner cylinder (103) is formed by selecting a second cylinder with a diameter smaller than the inner diameter of the first cylinder. A first cap (105) is welded to one end of the second cylinder; A first groove (105c) is formed on the end face of the first cover (105) and in the overlapping area with the connector (107), and a sealing gasket is installed in the first groove (105c). A first through hole is made at the center of the end face of the first cover (105), so that the through rod (105a) with a handle passes through the first through hole and extends to the outside of the second cylinder, and the handle is welded and fixed to the first cover (105); An external thread is provided at the end of the through rod (105a) to form a male part (105b). Select a second cover (106), open a second groove (106b) on the end face of the second cover (106), open a second through hole at the center of the end face of the second cover (106), and fix a female part (106a) that is compatible with the male part (105b) at the second through hole. Select an inner mesh (103a) with a diameter smaller than the inner diameter of the second cylinder, insert the inner mesh (103a) into the second cylinder, and load the detection agent into the inner mesh (103a); The female part (106a) on the second cover (106) is threadedly connected to the male part (105b) on the through rod (105a) until the bottom surface of the groove (106b) contacts the end of the second cylinder and the side surface of the groove (106b) is in close contact with the inner mesh (103a).

14. The assembly method of the test filter element as described in claim 13, characterized in that: The final assembly steps include: Insert the inner cylinder (103) into the outer cylinder (101) so that the sealing gasket is in close contact with the connector (107). Then, the first cover (105) and the connector (107) are detachably fixed by fasteners that pass through the first cover (105) and the connector (107). After the first cover (105) is fixed to the connector (107), the plurality of inner holes (104) are respectively coaxially arranged with the corresponding outer holes (102).

Images