Connecting device of filter and filtering system

Abstract

The utility model provides a connecting device of a filter and a filtering system. The filter comprises a connecting port, the connecting device comprises a fixing piece and a connector pipe arranged on the fixing piece in a penetrating mode. The connecting device further comprises a first O-shaped ring, the connector pipe comprises an insertion section capable of being inserted into the connecting port, and the insertion section extrudes the first O-shaped ring to form sealed connection of the connector pipe and the filter. One side of the first O-shaped ring is provided with a limiting part through which the insertion section penetrates, a gap is formed between the outer side wall of the insertion section and the inner side wall of the connecting port, and an axial limiting distance for preventing the joint pipe from inclining at the angle exceeding the maximum inclination angle is formed between the limiting part and the first O-shaped ring; the maximum inclination angle is based on at least one of the compression ratio upper limit and the compression ratio lower limit of the first O-ring, and has the advantage of avoiding excessive inclination of the joint pipe so as to maintain the tightness of the first O-ring to the joint pipe and the connection port.

Description

Technical Field

[0001] The utility model relates to the technical field of filtering devices, in particular to a connection device of a filter and a filtering system. Background Art

[0002] Filtration systems are commonly used for refining or separating fluids such as liquids and gases. The filters that play the main filtering role usually have multiple connection ports for connecting to external pipelines. In order to achieve the disconnection or connection between the connection ports of the filter and the external pipeline, a connecting device for connecting the two is generally provided between the filter and the external pipeline.

[0003] Existing connection devices for installing filters usually include a movable plate (movable part), a fixed part and multiple joint pipes inserted into the fixed part. When in use, after the filter with multiple connection ports is installed on the movable plate, the connection ports are aligned with the multiple joint pipes on the fixed part, and then the movable plate is driven to drive the filter to move upward relative to the fixed part to achieve docking and sealing between the multiple connection ports and the multiple joint pipes, such as inserting the joint pipe into the connection port to achieve sealing.

[0004] For example, the Japanese patent with the publication number of JP4234938B2 discloses a connection device for a filter, which discloses a head plate (fixed part) and a movable workbench, the movable workbench can move up and down relative to the head plate, and a plurality of connector tubes are arranged on the head plate. After the filter is installed on the movable workbench, the port tube of the filter is aligned with the connector tube in position, so that the port tube of the filter is driven to dock and seal with the port tube when the movable workbench moves up and down. And the connector tube is inserted into the inner wall of the connection port of the filter through the O-ring (O-ring seal) for extrusion sealing. It can be known that the O-ring has a certain upper and lower limits of compression ratio. The actual extrusion degree (compression ratio) of the O-ring is between the upper and lower limits of the compression ratio to ensure that the O-ring can effectively play a sealing role, and make the effective sealing connection between the connector tube and the connection port; when the compression ratio of the O-ring is less than the lower limit, it indicates that the compression is insufficient, which will cause leakage; when the compression ratio of the O-ring is greater than the upper limit, it indicates that the radial load of the O-ring is too large and the compression is excessive, which will also cause leakage if the service life of the O-ring is reduced.

[0005] However, in the actual assembly and use process, the joint pipe may be tilted relative to its axial direction (vertical direction), and the O-ring is radially squeezed on the outer wall surface of the joint pipe to achieve sealing (i.e., the O-ring is symmetrically distributed on two opposite sides about the central axis of the joint pipe). Therefore, when the joint pipe is tilted, the tilted joint pipe will increase the squeezing of the part of the O-ring on one side, while the squeezing of the part of the O-ring on the other side will be reduced. It can be known that if the joint pipe is tilted excessively, the squeezing degree of one side of the O-ring will exceed the upper limit of the compression ratio, and the squeezing degree of the other side will be lower than the lower limit of the compression ratio, thereby causing the O-ring seal between the joint pipe and the connection port to fail, causing leakage of the filter.

[0006] Therefore, it is urgent for those skilled in the art to provide a connection device and a filter system for a filter to prevent the joint pipe of the connection device from being excessively tilted so as to ensure the sealing effect of the O-ring. Utility Model Content

[0007] SUMMARY OF THE UTILITY MODEL The technical problem to be solved by the present utility model is to overcome the defects in the prior art, thereby providing a filter connection device and a filter system.

[0008] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0009] A connection device for a filter, the filter comprising a connection port; the connection device comprising a fixing member and a joint pipe penetrated by the fixing member; the connection device further comprising a first O-ring, the joint pipe comprising an insertion section capable of being inserted into the connection port, the first O-ring being compressed between the insertion section and the inner side wall of the connection port, the insertion section squeezing the first O-ring to form a sealed connection between the joint pipe and the filter; a limiting member penetrated by the insertion section is provided on one axial side of the first O-ring, a gap is provided between the outer side wall of the insertion section and the inner side wall of the connection port, and the limiting member is located in the gap, an axial limiting distance is provided between the limiting member and the first O-ring to prevent the joint pipe from tilting at a maximum tilt angle, the maximum tilt angle being based on at least one of an upper limit and a lower limit of a compression ratio of the first O-ring.

[0010] Through the above technical solution, the insertion section of the joint pipe passes through the first O-ring and the limiter, and the limiter is located on one side of the first O-ring, so that a certain axial limit distance can be formed between the limiter and the first O-ring, and the joint pipe can be further limited from tilting beyond its maximum allowable tilt angle, so that the actual compression ratio of the first O-ring is always between the upper limit and the lower limit of the compression ratio, so that the first O-ring can play an effective sealing effect.

[0011] Preferably, the first O-ring has a first contact and extrusion portion that contacts and extrudes the inner side wall of the connecting port, and the limiting member has a second contact and extrusion portion that contacts and extrudes the inner side wall of the connecting port, the first contact and extrusion portion and the second contact and extrusion portion are arranged at intervals, and the axial spacing between the first contact and extrusion portion and the second contact and extrusion portion constitutes the axial limiting distance.

[0012] Through the above technical solution, the first O-ring is always squeezed by the inner side wall of the joint pipe and the connecting port to achieve sealing and has a first contact extrusion portion. Therefore, the portion of the first O-ring that is squeezed and in contact with the inner side wall of the connecting port is the first contact extrusion portion; the second contact extrusion portion can be formed by the pre-contact of the limiter and the inner side wall of the connecting port when the joint pipe is not tilted, or can be formed by the re-contact of the limiter and the inner side wall of the connecting port when the joint pipe is tilted. The first contact extrusion portion and the second contact extrusion portion form an axial limiting distance to limit the inclination angle of the joint pipe. The larger the axial limiting distance, the smaller the maximum inclination angle at which the joint pipe can be tilted, so that the first O-ring can have a better sealing effect.

[0013] Preferably, the ratio of the radial width of the gap to the axial limiting distance is c, 0<c≤1.

[0014] Through the above technical scheme, when the ratio of the radial width of the gap to the axial limit distance is set to be less than or equal to 1, the axial limit distance is always greater than or equal to the radial width of the gap. Even if the gap size changes due to manufacturing errors in the joint pipe or the connection port, and the maximum inclination angle of the joint pipe changes inconsistently, it can be ensured that the axial limit distance always prevents the joint pipe from exceeding the maximum inclination angle. Since the radial width of the gap positively correlates with the maximum inclination angle of the joint pipe, the larger the gap, the larger the maximum inclination angle of the joint pipe, and the larger the required axial limit distance. The smaller the gap, the smaller the maximum inclination angle of the joint pipe, and the smaller the required axial limit distance. The axial limit distance increases and decreases with the radial width of the gap. Therefore, the axial limit distance is always greater than or equal to the radial width of the gap, which can reduce the impact of sealing failure caused by manufacturing errors.

[0015] Preferably, the limiting member is detachably arranged on the insertion section.

[0016] By means of the above technical scheme, the limiter is detachably mounted on the insertion section. On the one hand, the disassembly and assembly setting means enables the limiter to be adjusted to a predetermined position in the axial direction of the insertion section, which can facilitate adjustment of the axial limit distance between the limiter and the first O-ring, so that the axial limit distance can always be greater than the radial width of the gap, and the size of the axial limit distance can be adjusted to ensure that the joint pipe does not tilt beyond the maximum tilt angle, further avoiding the joint pipe from squeezing one side of the first O-ring too heavily and the other side too lightly, thereby ensuring the sealing effect of the first O-ring; on the other hand, the limiter can be directly replaced, thereby increasing the service life of the joint pipe, because in the filtration system, the filter has a certain service life or is a The filter is designed to be used once. When the service life of the filter reaches its limit, it needs to be replaced, and another new filter is connected through the joint pipe of the connecting device. That is, the joint pipe of the connecting device of the filtering system is to be used repeatedly. In this solution, the limiter is detachably installed on the joint pipe of the connecting device. During the use of the joint pipe, the limiter is in contact and squeezed with the inner wall of the connecting port to prevent the joint pipe from being excessively tilted. When the limiter plays a limiting function in preventing the joint pipe from being excessively tilted, it is achieved by contact and squeezing the inner wall of the connecting port. In addition, the inclination direction of the joint pipe is not fixed and long-term use will cause the limiter to wear. The limiter can be directly disassembled and replaced after excessive wear, which can ensure that the limiter can effectively play its limiting function for a long time.

[0017] Preferably, the limiting member is an elastic ring member sleeved on the insertion section.

[0018] Through the above technical solution, the elastic ring-shaped member can be compressed and rebound. When performing the limiting function, it can reduce the inconsistent gaps between the connection ports of different filters caused by manufacturing tolerances or other errors, or the uneven gaps caused by poor matching between the connecting pipe and the connection port. The compression and rebound of the elastic ring-shaped member are conducive to providing a certain elastic space to overcome the above problems.

[0019] Preferably, the elastic annular member is a second O-ring, which is compressed between the insertion section and the inner side wall of the connection port to form a seal.

[0020] Through the above technical solution, the elastic annular member is specifically a second O-ring. On the one hand, as long as the actual compression ratio of the second O-ring is between the upper and lower limits of the compression ratio, the second O-ring can still maintain good sealing performance, thereby forming a double seal with the first O-ring; on the other hand, the second O-ring is interference fit with the connecting port, and the second O-ring can also play a limiting role even if the connecting pipe is tilted at a certain angle.

[0021] Preferably, the limiting member is a hard cylindrical member sleeved on the joint pipe, and the outer diameter of the hard cylindrical member is less than or equal to the inner diameter of the connecting port.

[0022] Through the above technical solution, the hard cylindrical member can be inserted into the connecting port together with the joint pipe, and can also limit the excessive tilt of the joint pipe.

[0023] Preferably, the lower end of the insertion section has a step groove, and the first O-ring is protruded in the step groove; and / or, the outer wall of the insertion section is provided with an annular groove, and the second O-ring is protruded in the annular groove.

[0024] Through the above technical solution, when a step groove is provided at the lower end of the insertion section and the insertion section is inserted into the connecting port, the vertical wall surface of the step groove and the inner wall of the connecting port can radially extrude and radially limit the first O-ring, ensuring that the compression ratio of the first O-ring is between the upper and lower limits of the compression ratio to achieve a sealing effect. In addition, the radially extruded first O-ring can abut against the horizontal wall surface of the step groove and the inner bottom wall of the connecting port, thereby maintaining the stability of the installation position of the first O-ring and further maintaining the stability of the axial limiting distance between the first O-ring and the second O-ring. Excessive tilting of the joint pipe can be avoided by setting a reasonable axial limiting distance, thereby maintaining the sealing effect of the first O-ring.

[0025] Similarly, when the outer wall of the insertion section is provided with an annular groove and the second O-ring is protruding from the annular groove, the annular groove and the inner wall of the connecting port can achieve radial extrusion and radial limitation of the second O-ring to maintain the horizontal installation of the second O-ring and ensure the stable installation of the second O-ring, thereby increasing the sealing effect of the first O-ring and the second O-ring on the joint pipe and the connecting port.

[0026] Preferably, the axial limit distance is H, the inclination angle of the joint pipe is θ, and the upper and lower limits of the compression ratio of the first O-ring are C and C respectively. U and C L , the compression ratio of the first O-ring is C, the thickness of the first O-ring in the uncompressed state is T0, and H satisfies the following relationship:

[0027] Through the above technical solution, the parameter relationship between the inclination angle θ of the joint pipe and the axial limit distance H can be expressed, and the size of the axial limit distance H can be determined. Specifically, due to the compression ratio upper limit C of the first O-ring U 、The lower limit of the compression ratio of the first O-ring C LThe thickness T0 of the first O-ring in an uncompressed state can be directly determined according to the model of the first O-ring (i.e., the factory parameters), and the inclination angle θ of the joint pipe can be measured when the joint pipe is installed. Further, the size of the axial limit distance H can be directly obtained according to the above formula, and the axial distance between the first O-ring and the limit member can be adjusted.

[0028] The utility model also provides a filtering system, comprising a filter and a connecting device capable of being sealed and connected to the filter, wherein the connecting device is any one of the connecting devices mentioned above.

[0029] Compared with the prior art, the beneficial effects of the present invention are:

[0030] 1. By inserting the insertion section of the joint pipe through the first O-ring and the limiting member, and the limiting member is located on one side of the first O-ring, a certain axial limiting distance can be formed between the limiting member and the first O-ring, and the joint pipe can be further limited from tilting beyond its maximum allowable tilt angle, so that the actual compression ratio of the first O-ring is always between the upper limit and the lower limit of the compression ratio, so that the first O-ring can have a better sealing effect.

[0031] 2. By detachably installing the limit piece on the insertion section, on the one hand, it is easy to adjust the position of the limit piece on the joint pipe and change the axial limit distance between the limit piece and the first O-ring, which can be changed according to the size of the gap between the joint pipe and the inner wall of the connecting port; on the other hand, direct wear between the joint pipe and the connecting port can be avoided, and the limit piece can be directly disassembled and replaced after excessive wear, thereby increasing the service life of the joint pipe and ensuring the limiting function of the limit piece. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] In order to more clearly illustrate the specific implementation methods of the utility model or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0033] Figure 1 It is a schematic structural diagram of the first embodiment of the utility model.

[0034] Figure 2 for Figure 1 Schematic diagram of the cut along section AA.

[0035] Figure 3 for Figure 2 A magnified schematic diagram of position B in the middle.

[0036] Figure 4 for Figure 3 Schematic diagram of the change of the central axis of the joint pipe when the middle joint pipe is tilted to a certain degree.

[0037] Figure 5 This is a schematic structural diagram of another implementation of the position limiting member in the utility model.

[0038] Figure 6 It is a schematic structural diagram of a second embodiment of the utility model.

[0039] Description of reference numerals:

[0040] 100, filter; 1001, connection port; 10011, inner wall; 1, fixing piece; 2, joint pipe; 21, insertion section; 211, outer wall; 212, step groove; 213, annular groove; 3, first O-ring; 31, first contact extrusion portion; 4, stopper; 41, second contact extrusion portion; 42, second O-ring; 5, gap. DETAILED DESCRIPTION

[0041] The technical solution of the utility model will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0042] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0043] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0044] Embodiment 1

[0045] See also Figures 1 to 4 The embodiment of the utility model provides a filter connection device for connecting the filter 100 with an external pipeline, wherein the filter 100 includes a connection port 1001; the connection device includes a fixing member 1 and a joint pipe 2 penetrated through the fixing member 1, and during assembly, the joint pipe 2 is inserted into the connection port 1001, thereby realizing the docking installation of the connection device and the filter 100, and the filter device also includes a component capable of driving the filter 100 to move up and down, which is the prior art and will not be described in detail here.

[0046] Specifically, see Figure 2 and Figure 3 The joint pipe 2 includes an insertion section 21 that can be inserted into the connection port 1001. In order to achieve sealing between the insertion section 21 and the connection port 1001, in this embodiment, the connection device also includes a first O-ring 3 compressed between the insertion section 21 and the inner side wall 10011 of the connection port 1001. The insertion section 21 squeezes the first O-ring 3 to form a sealed connection between the joint pipe 2 and the filter 100. There is a gap 5 between the outer side wall 211 of the insertion section 21 and the inner side wall 1001 of the connection port 1001. The gap 5 is provided to facilitate the plug-in and pull-out fit between the insertion section 21 and the connection port 1001. However, due to the existence of the gap 5, when the joint pipe 2 is plugged and sealed in the connection port 1001, the joint pipe 2 may be disturbed, and roughly tilted relative to the vertical with the first O-ring 3 as a fulcrum, thereby affecting the extrusion sealing of the first O-ring 3. The specific reasons are as follows.

[0047] It can be known that the uncompressed thickness T0 of the first O-ring 3 (for example, the thickness of the first O-ring 3 when the insertion section 21 is not inserted into the connection port 1001, that is, the thickness of the first O-ring 3 when not compressed), the first O-ring 3 has a thickness T1, and compression of the first O-ring 3 will reduce its thickness. The thickness T1 can also be called the compressed thickness T1 of the first O-ring 3. The compression ratio of the first O-ring 3 can be determined as follows: Since the first O-ring 3 has a certain upper and lower compression ratio limits, and the actual compression ratio of the first O-ring 3 is between the upper and lower compression ratio limits, effective sealing can be ensured. For example, the upper and lower compression ratio limits can be determined according to industrial standards, such as (for example) according to the international standard ISO-3601-2 for hydraulic dynamic systems (for example, ISO-3601-2:2016). For example, according to the international standard ISO-3601-2, an O-ring with a diameter of 2.6 mm has a lower compression ratio limit of 12% or about 12% and an upper compression ratio limit of 24% or about 24%.

[0048] refer to Figure 3In the cross-sectional view shown, due to the existence of the gap 5, when the joint pipe 2 is tilted and rotated to the right at a certain angle approximately with the first O-ring 3 as the fulcrum, as described in the reference background technology, the first O-rings 3 located on both sides of L1 are subjected to different pressures, which will increase the radial load of the first O-ring 3 on the left side of L1, and the pressure of the first O-ring 3 on the left side of L1 will be aggravated (over-extrusion). There is a risk that the extrusion degree (actual compression ratio) of the first O-ring 3 on the left side of L1 will be greater than the upper limit of the compression ratio of the first O-ring 3, so that the sealing of the first O-ring 3 on the left side of L1 will fail. Similarly, the radial load of the first O-ring 3 on the right side of L1 will be reduced, and the pressure of the first O-ring 3 on the right side of L1 will be reduced (under-extrusion). There is a risk that the extrusion degree (actual compression ratio) of the first O-ring 3 on the right side of L1 will be less than the lower limit of the compression ratio of the first O-ring 3, so that the sealing of the first O-ring 3 on the right side of L1 will fail. Since the insertion section 21 passes through the first O-ring 3 , the inclination of the insertion section 21 (ie the joint pipe 2 ) will directly affect the extrusion of the first O-ring 3 and thus the sealing effect of the first O-ring 3 .

[0049] Therefore, in order to prevent the excessive tilt angle of the joint pipe 2 from affecting the sealing effect and service life of the first O-ring 3, in this embodiment, a limiter 4 penetrated by the insertion section 21 is provided on the upper side of the first O-ring 3, and the limiter 4 is located in the gap 5. There is an axial limit distance between the limiter 4 and the first O-ring 3 to prevent the joint pipe 2 from tilting at a maximum tilt angle. The maximum tilt angle is based on at least one of the upper and lower limits of the compression ratio of the first O-ring 3. Of course, in other embodiments, the limiter 4 can also be provided on the lower side of the first O-ring 3. It should also be noted that the axial direction refers to the distance between the joint pipe 2 and the first O-ring 3. Figure 2-5 In the vertical direction, the axial limiting distance means a limiting distance formed in the axial direction (vertical direction) for preventing the joint pipe 2 from being excessively tilted.

[0050] The stopper 4 and the first O-ring 3 are both penetrated by the insertion section 21, so the stopper 4 and the first O-ring 3 cooperate together on the outer peripheral side of the insertion section 21 to limit the tilting. The larger the axial limit distance, the smaller the angle at which the joint pipe 2 can be tilted. The maximum tilting angle based on the compression ratio upper limit and / or compression ratio lower limit of the first O-ring 3 means that it is the maximum tilting angle that can ensure that the joint pipe 2 effectively seals the first O-ring 3 without leakage. The joint pipe 2 tilted greater than the maximum tilting angle cannot effectively seal the first O-ring 3, which will inevitably cause the first O-ring 3 to be located at least on one side of L1 greater than the compression ratio upper limit or less than the compression ratio lower limit.

[0051] More specifically, the first O-ring 3 has a first contact and extrusion portion 31 that contacts and extrudes the inner side wall 10011 of the connection port 1001, and the stopper 4 has a second contact and extrusion portion 41 that contacts and extrudes the inner side wall 10011 of the connection port 1001. The first contact and extrusion portion 31 and the second contact and extrusion portion 41 are arranged at intervals, and the axial spacing between the first contact and extrusion portion 31 and the second contact and extrusion portion 41 constitutes an axial limit distance. Since the first O-ring 3 is always radially extruded to form a seal, the first contact and extrusion portion 31 is the portion of the first O-ring 3 that contacts the inner side wall 10011 of the connection port 1001 when the first O-ring 3 is compressed and deformed, and for example, it can be the left half of the first O-ring 3 after being compressed. The stopper 4 may always be in contact with and squeeze the inner side wall 10011 of the connection port 1001, and the identification principle of the second contact and squeeze portion 31 is the same as that of the first contact and squeeze portion 31. The stopper 4 may also be initially provided with a gap with the inner side wall 10011 of the connection port 1001, and when the joint pipe 2 tilts, the portion of the stopper 4 that contacts the inner side wall 10011 of the connection port 1001 after tilting forms the second contact and squeeze portion 31. The above-mentioned contact portion includes point, line and surface contacts.

[0052] Of course, in some embodiments, the axial limiting distance may be the axial distance between the geometric center of the first contact and extrusion portion 31 and the geometric center of the second contact and extrusion portion 41. It is worth noting that the "first contact and extrusion portion 31" referred to in this embodiment is the area of ​​the first O-ring 3 that contacts the inner side wall 10011 of the connection port 1001, and similarly, the "second contact and extrusion portion 41" is the area of ​​the limiter 4 that contacts the inner side wall 10011 of the connection port 1001.

[0053] In order to ensure that the limiter 4 can always prevent the joint pipe 2 from tilting beyond the maximum tilt angle without exceeding the maximum tilt angle allowed by the joint pipe 2, and to avoid the joint pipe 2 from squeezing one side of the first O-ring 3 too heavily and the other side too lightly, and to ensure the sealing effect of the first O-ring 3, the ratio of the radial width of the gap 5 to the axial limit distance is c, 0<c≤1, that is, the radial width of the gap 5 is always less than or equal to the axial limit distance H, ensuring that the axial limit distance H greater than or equal to the radial width of the gap 5 can always prevent the joint pipe 2 from tilting beyond the maximum angle.

[0054] The radial width of the gap 5 will affect the axial limit distance H, because the radial width of the gap 5 positively affects the maximum inclination angle of the joint pipe 2. The larger the radial width of the gap 5, the larger the maximum inclination angle of the joint pipe 2. The axial limit distance H represents the actual ability of the joint pipe 2 to tilt. The larger the axial limit distance H, the smaller the angle at which the joint pipe 2 can tilt. In fact, the purpose of setting the limiter 4 is to make the actual tilt angle of the joint pipe 2 less than or equal to the maximum tilt angle. Figure 5 When the axial limit distance H1 is greater than the axial limit distance H2, the tilt angle θ1 of the joint pipe 2 corresponding to H1 is smaller than θ2. Therefore, the larger the radial width of the gap 5 is, the larger the required axial limit distance H is. In actual products, due to the manufacturing error of the joint pipe 2 and the connecting port 1001 or the assembly error of the two or the wear of the joint pipe 2 due to long-term use, the radial width of the gap 5 increases in an uncertain manner. After ensuring that the axial limit distance H is greater than the radial width of the gap 5, the axial limit distance H can play an effective limiting role.

[0055] The connection modes of the stopper 4 and the joint pipe 2 can be set in various ways, and can cooperate with the first O-ring 3 to form an axial stopper distance H that prevents the joint pipe 2 from tilting beyond the maximum tilt angle.

[0056] See also Figure 3 In the present embodiment, the stopper 4 is detachably arranged on the insertion section 21. On the one hand, it is convenient for the operator to adjust the axial limit distance between the stopper 4 and the first O-ring 3 so that the inclination angle of the joint pipe 2 does not exceed the maximum inclination angle allowed to be inclination, so as to ensure the sealing effect of the first O-ring 3; on the other hand, the setting of the stopper 4 makes it possible for the stopper 4 to contact and squeeze the inner side wall 10011 of the connection port 1001 during the insertion process of the insertion section 21 of the joint pipe 2, so that the joint pipe 2 and the connection port 1001 can be squeezed and sealed while avoiding direct contact and wear between the joint pipe 2 and the connection port 1001, thereby increasing the service life of the joint pipe 2. In addition, the stopper 4 can be directly disassembled and replaced after excessive wear, thereby ensuring the limiting function of the stopper 4.

[0057] Furthermore, in order to further increase the sealing performance between the connection port 1001 and the joint pipe 2, in the present embodiment, the limiting member 4 is configured as an elastic ring member sleeved on the insertion section 21. Specifically, the elastic ring member is a second O-ring 42, which is compressed between the insertion section 21 and the inner side wall 10011 of the connection port 1001 and forms a seal. During installation, the second O-ring 42 can be interference-fitted with the connection port 1001, thereby increasing its sealing effect on the insertion section 21 and the connection port 1001. At the same time, the second O-ring 42 has a certain elasticity, so that even if the joint pipe 2 is tilted at a certain angle, as long as the actual compression ratio of the second O-ring 42 is between the upper and lower limits of the compression ratio, the second O-ring 42 can still maintain good sealing performance when limiting the tilt of the joint pipe 2. In addition, the second O-ring 42 and the first O-ring 3 are both mounted on the outer wall 211 of the insertion section 21, which can not only cooperate with each other to maintain the stability of the joint pipe 2 to prevent excessive tilting, but also perform double-layer sealing, thereby improving the sealing between the joint pipe 2 and the connection port 1001.

[0058] Of course, in other embodiments, the stopper 4 can also be configured as a hard cylindrical member sleeved on the joint pipe 2, see the attached Figure 5 At this time, it is sufficient to ensure that the outer diameter of the hard cylindrical member is less than or equal to the inner diameter of the connection port 1001 so that the setting of the limit member 4 will not affect the assembly of the joint pipe 2 and the connection port 1001.

[0059] See also Figure 3 In order to further maintain the horizontal installation of the first O-ring 3 and ensure the stability of the installation of the first O-ring 3, in the present embodiment, the lower end of the insertion section 21 has a step groove 212, and the first O-ring 3 is protruded in the step groove 212; when the lower end of the insertion section 21 is provided with the step groove 212 and the insertion section 21 is inserted into the connection port 1001, the vertical wall surface of the step groove 212 can radially squeeze and radially limit the first O-ring 3, thereby ensuring the sealing effect of the first O-ring 3; on the other hand, the compressed first O-ring 3 can respectively contact the horizontal wall of the step groove 212 and the inner bottom wall of the connection port 1001, thereby maintaining the stability of the installation position of the first O-ring 3, and further maintaining the stability of the axial limit distance between the first O-ring 3 and the second O-ring 42, and avoiding excessive tilting of the joint pipe 2 by setting a reasonable axial limit distance, thereby maintaining the sealing effect of the first O-ring 3.

[0060] Similarly, in order to further maintain the horizontal installation of the second O-ring 42 and ensure the stability of the installation of the second O-ring 42, an annular groove 213 is provided on the outer wall of the insertion section 21, and the second O-ring 42 is radially protruded from the annular groove 213. When the outer side wall 211 of the insertion section 21 is provided with the annular groove 213, and the second O-ring 42 is radially protruded from the annular groove 213, the vertical wall and the horizontal wall formed by the annular groove 213 can achieve radial extrusion and radial limitation of the second O-ring 42, so as to maintain the horizontal installation of the second O-ring 42 and ensure the stable installation of the second O-ring 42, and increase the sealing effect of the first O-ring 3 and the second O-ring 42 on the joint pipe 2 and the connection port 1001.

[0061] It is worth noting that the axial limit distance, the inclination angle of the joint tube 2 (the actual inclination angle of the joint tube 2), and the compression ratio of the first O-ring 3 (the actual compression ratio of the first O-ring 3) are related to each other. By setting the parameters among the axial limit distance, the inclination angle of the joint tube 2, and the compression ratio of the first O-ring 3, the good sealing performance of the first O-ring 3 can be maintained.

[0062] Specifically, for the convenience of description, the axial limit distance is H, the actual compression ratio of the first O-ring 3 is C, the actual inclination angle of the joint pipe 2 is θ, and the upper limit of the compression ratio of the first O-ring 3 is set to C. U and the compression ratio lower limit is C L , the thickness of the first O-ring 3 in the uncompressed state is T0, wherein, when the model of the first O-ring 3 is determined, the upper limit of the compression ratio of the first O-ring 3 is set to C U , the lower limit of compression ratio is C L , the thickness of the first O-ring 3 in the uncompressed state is T0, which are known constants and can be obtained according to the factory parameters of the first O-ring 3. In order to ensure the sealing effect of the first O-ring 3, H satisfies the following relationship:

[0063]

[0064] The best installation state is that the joint pipe 2 is installed vertically (that is, the central axis of the joint pipe 2 coincides with the central axis of the connection port 1001), see Figure 3 , taking one of the vertical interfaces passing through the central axis L1 as an example, at this time, the first O-rings 3 on both sides of the joint pipe 2 are subjected to balanced extrusion. In order to ensure the extrusion sealing performance of the first O-ring 3, the compression ratio of the first O-ring 3 must meet C L ≤C≤C U , that is, satisfying C L T0≤CT0≤C U T0, that is, the actual compression amount (CT0) of the first O-ring 3 is within the upper limit of the compression amount allowed by the first O-ring 3 (C UT0) and the lower limit of the compression allowed by the first O-ring 3 (C L T0).

[0065] Further, see Figure 4 , take the example of the joint pipe 2 tilting to the left side in the figure, when the central axis L1 of the joint pipe 2 deflects by an angle of θ, the central axis of the joint pipe 2 after deflection is L2, and the angle between L1 and L2 is θ, which is the tilt angle θ of the joint pipe 2. When the joint pipe 2 tilts to the left side in the figure, the first O-ring 3 is squeezed to the right of the central axis L1, and the first O-ring 3 is squeezed to the left of the central axis L1. The amount of compression allowed by the first O-ring 3 is D (the amount that can be squeezed or released on the first O-ring 3 roughly in the radial direction, which can also be called the compression safety value. If the joint pipe 2 exceeds or falls below the compression safety value roughly in the radial direction, the sealing of the first O-ring 3 will fail). In order to meet the extrusion sealing of the first O-ring 3, then: CT0-C L T0≤D≤C U T0-CT0.

[0066] To go further, the intersection of L1 and L2 is a, and the intersection a is approximately located at the center point of the limiter 4 (the center of the annular structure, and also the midpoint of the line connecting the symmetrical two sides of the limiter 4). Then, with the intersection a as the center, and the distance between the intersection a and the center point b of the first O-ring 3 (the center of the annular structure, and also the midpoint of the line connecting the symmetrical two sides of the first O-ring 3) as the radius, draw a circle, and the distance (radius) between a and b is equal to the axial limit distance H; the intersection of the circular trajectory and the central axis of the deflected joint pipe 2 is L2 is c, then the distance between a and b, and the distance between a and c are both equal to the axial limit distance H, and the distance between b and c is approximately D, which is also the amount allowed to be re-compressed or released while satisfying the sealing effect of the first O-ring 3. Draw the perpendicular bisector L3 of the line connecting b and c, and L3 passes through point a and the midpoint d of the line connecting b and c. It can be seen from this that △abd is a right triangle, then: From the above, we can know that: CT0-C L T0≤D≤C U T0-CT0, then:

[0067] It can be known that when the relative installation position of the first O-ring 3 is fixed, the size of the inclination angle θ of the joint pipe 2 is affected by the axial limiting distance H from the limiting member 4 to the first O-ring 3, see Figure 5 It can be seen that when the axial limiting distance from the limiting member 4 to the first O-ring 3 is H1, the allowable inclination angle of the joint pipe 2 is θ1, and when the distance from the limiting member 4 to the first O-ring 3 is H2, the allowable inclination angle of the joint pipe 2 is θ2, and when H1>H2, θ2>θ1.

[0068] Embodiment 2

[0069] See also Figure 6 Based on the above-mentioned embodiment 1, this embodiment further provides a filtering system, including a filter 100 and a connecting device that can be sealed and connected to the filter 100, and the connecting device is the connecting device of the above-mentioned embodiment 1.

[0070] The above-mentioned implementation modes are only preferred implementation modes of the present invention, and cannot be used to limit the protection scope of the present invention. Any non-substantial changes and substitutions made by technicians in this field on the basis of the present invention shall fall within the scope of protection required by the present invention.

Claims

1. A connection device for a filter, the filter comprising a connection port; the connection device comprising a fixing member and a joint pipe passing through the fixing member; It is characterized in that The connection device further comprises a first O-ring, the joint pipe comprises an insertion section which can be inserted into the connection port, the first O-ring is compressed between the insertion section and the inner side wall of the connection port, and the insertion section squeezes the first O-ring to form a sealed connection between the joint pipe and the filter; A stopper penetrated by the insertion section is provided on one side of the first O-ring, a gap is provided between the outer wall of the insertion section and the inner wall of the connection port, and the stopper is located in the gap, and an axial stopper distance is provided between the stopper and the first O-ring to prevent the joint pipe from tilting at a maximum tilt angle, and the maximum tilt angle is based on at least one of an upper limit and a lower limit of a compression ratio of the first O-ring.

2. A filter connection device according to claim 1, It is characterized in that The first O-ring has a first contact and extrusion portion that contacts and extrudes the inner side wall of the connecting port, and the limiting member has a second contact and extrusion portion that contacts and extrudes the inner side wall of the connecting port. The first contact and extrusion portion and the second contact and extrusion portion are arranged at intervals, and the axial spacing between the first contact and extrusion portion and the second contact and extrusion portion constitutes the axial limiting distance.

3. A filter connection device according to claim 1, It is characterized in that The ratio of the radial width of the gap to the axial limiting distance is c, 0<c≤1.

4. A filter connection device according to claim 1, It is characterized in that The limiting member is detachably arranged on the inserting section.

5. A filter connection device according to any one of claims 1 to 4, It is characterized in that The limiting member is an elastic ring member sleeved on the insertion section.

6. A filter connection device according to claim 5, It is characterized in that The elastic annular member is a second O-ring, which is compressed between the insertion section and the inner side wall of the connection port to form a seal.

7. A filter connection device according to any one of claims 1 to 4, It is characterized in that The limiting member is a hard cylindrical member sleeved on the joint pipe, and the outer diameter of the hard cylindrical member is less than or equal to the inner diameter of the connecting port.

8. A filter connection device according to claim 6, It is characterized in that The lower end of the insertion section has a step groove, and the first O-ring is convexly arranged in the step groove; and / or, An annular groove is formed on the outer wall of the insertion section, and the second O-ring is protruded from the annular groove.

9. A filter connection device according to any one of claims 1 to 4, It is characterized in that The axial limit distance is H, the inclination angle of the joint pipe is θ, and the upper and lower limits of the compression ratio of the first O-ring are C U and C L , the compression ratio of the first O-ring is C, and the thickness of the first O-ring in the uncompressed state is T 0 , H satisfies the following relationship:

10. A filtration system, It is characterized in that It comprises a filter and a connecting device capable of being sealed and connected to the filter, wherein the connecting device is the connecting device according to any one of claims 1 to 9.

Images