CN110052060B - Hollow fiber degassing membrane module - Google Patents
Hollow fiber degassing membrane module Download PDFInfo
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- CN110052060B CN110052060B CN201910334706.4A CN201910334706A CN110052060B CN 110052060 B CN110052060 B CN 110052060B CN 201910334706 A CN201910334706 A CN 201910334706A CN 110052060 B CN110052060 B CN 110052060B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D19/00—Degasification of liquids
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D61/00—Processes of separation using semi-permeable membranes, e.g. dialysis, osmosis or ultrafiltration; Apparatus, accessories or auxiliary operations specially adapted therefor
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D63/00—Apparatus in general for separation processes using semi-permeable membranes
- B01D63/02—Hollow fibre modules
- B01D63/04—Hollow fibre modules comprising multiple hollow fibre assemblies
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Abstract
The invention provides a hollow fiber degassing membrane component which can facilitate liquid to flow towards a liquid outlet, improve degassing efficiency, and effectively reduce impact force on a part of a membrane bundle corresponding to the liquid outlet, so as to avoid dispersion and fracture of the membrane bundle and prolong the service life of the membrane bundle. It is specific, including barrel and hollow fiber membrane bundle, be equipped with first and second sealing member between the both ends of membrane bundle and the barrel inner wall, the one end that the barrel is close to first sealing member is equipped with the gas outlet, the one end intercommunication of gas outlet and membrane bundle, the other end of barrel is equipped with the inlet, the one end encapsulation that is close to the inlet of membrane bundle, the position that the barrel inner wall is close to first sealing member is equipped with the annular shaft shoulder face of radial outside extension, form the overflow chamber between annular shaft shoulder face and the first sealing member, be equipped with the liquid outlet with overflow chamber intercommunication on the lateral wall of barrel, be equipped with the entry end on the annular shaft shoulder face, the entry end is located between first sealing member and the liquid outlet, form axially extending's runner between entry end and the liquid outlet.
Description
Technical Field
The invention relates to the technical field of filtering devices, in particular to a hollow fiber degassing membrane module.
Background
The prior art hollow fiber degassing membrane module is a degassing module made of hydrophobic hollow fiber membranes, and is commonly used for removing gas from required liquid materials, such as removing oxygen in water, removing total gas in water, removing bubbles in ink, and the like. At present, a commonly used hollow fiber degassing membrane assembly includes a cylinder and a hollow fiber membrane bundle installed in the cylinder, sealing members are respectively disposed between two ends of the hollow fiber membrane bundle and an inner wall of the cylinder, an air outlet and a liquid inlet are respectively disposed at two ends of the cylinder, one end of the hollow fiber membrane bundle is communicated with the air outlet, the other end of the hollow fiber membrane bundle is encapsulated, a liquid outlet located between the two sealing members is disposed on a side wall of the cylinder, when the hollow fiber degassing membrane assembly is used, liquid enters the cylinder through the liquid inlet and flows into a central hole of the hollow fiber membrane bundle, and then flows radially outward toward the inner wall of the cylinder, a negative pressure is generated in the hollow fiber tube in the process through vacuum pumping, and then gas in the liquid enters the hollow fiber tube and is discharged from the air outlet, so that gas in the liquid discharged from the liquid outlet is removed. However, because the liquid outlet sets up position and structure unreasonable among the prior art, often bring a series of problems, wherein more outstanding is, the clearance between hollow fiber membrane bundle and the barrel inner wall is less and the axial is equidimension, and then be in between membrane bundle and the barrel and keep away from the liquid outlet liquid be difficult for flowing to the liquid outlet direction, simultaneously because the clearance between hollow fiber membrane bundle and the barrel inner wall is greater than the clearance between the membrane silk, the liquid that is in this region degasses inefficiency, it is lower to lead to whole hollow fiber degasification membrane module's degasification efficiency above, membrane silk utilization ratio is uneven. Meanwhile, because the liquid outlet in the prior art is directly communicated with the hollow fiber membrane bundle, the impact force of the liquid on the hollow fiber membrane bundle is larger when the liquid flows to the liquid outlet, and the hollow fiber membrane bundle is easily dispersed and broken.
Disclosure of Invention
The technical problem to be solved by the present invention is to provide a hollow fiber degassing membrane module, which can facilitate the liquid to flow toward the liquid outlet, so as to effectively improve the degassing efficiency, and at the same time, can effectively reduce the impact force on the corresponding liquid outlet part of the hollow fiber membrane bundle, so as to avoid the dispersion and fracture of the hollow fiber membrane bundle, and prolong the service life of the hollow fiber membrane bundle.
The invention adopts the following technical scheme:
a hollow fiber degassing membrane component comprises a cylinder body and a hollow fiber membrane bundle, wherein a first sealing element and a second sealing element are respectively arranged between two ends of the hollow fiber membrane bundle and the inner wall of the cylinder body, an air outlet is arranged at one end of the cylinder body close to the first sealing element and is communicated with one end of the hollow fiber membrane bundle, the other end of the cylinder body is provided with a liquid inlet, one end of the hollow fiber membrane bundle close to the liquid inlet is packaged, it is characterized in that the inner wall of the cylinder body is provided with an annular shaft shoulder surface which extends radially outwards at a position close to the first sealing element, an overflow cavity is formed between the annular shaft shoulder surface and the first sealing element, a liquid outlet communicated with the overflow cavity is arranged on the side wall of the cylinder body, be equipped with the entry end on the annular shaft shoulder, the entry end is located first sealing member with between the liquid outlet, form axial extension's runner between entry end and the liquid outlet.
Because the inner wall of the cylinder body is provided with the annular shaft shoulder surface which is formed by extending outwards in the radial direction, the gap between the part of the hollow fiber membrane bundle, which is positioned between the annular shaft shoulder surface and the first sealing element, and the inner wall of the cylinder body is larger than the gap between the rest part of the hollow fiber membrane bundle and the inner wall of the cylinder body, namely the pressure in the overflow cavity is smaller, so that liquid is easier to flow into the overflow cavity under the action of pressure difference, and the overflow cavity is communicated with the liquid outlet, so that the discharge of the liquid is accelerated, and the degassing flow rate and the degassing efficiency are effectively improved; in addition, the overflow cavity reduces the flow velocity of liquid, and the setting of the runner of axial extension in addition can play the effect of the liquid of guide overflow intracavity, avoids the direct radial flow of liquid to the liquid outlet and produces great impact force to hollow fiber membrane bundle, has avoided hollow fiber membrane bundle to be close to liquid outlet one side and has taken place fracture or damage from this, has avoided the weeping, has prolonged the life of hollow fiber membrane bundle. Meanwhile, the contact area of the hollow fiber membrane bundle and liquid is increased, so that the utilization rate of the hollow fiber membrane bundle is improved.
Furthermore, a baffle plate is arranged between the flow channel and the hollow fiber membrane bundle, the end face of the baffle plate forms a part of the annular shaft shoulder surface, and the inlet end is positioned on one side, far away from the hollow fiber membrane bundle, of the annular shaft shoulder surface. So design, avoid the baffle to directly flow from the liquid outlet along the liquid in radial corresponding region, improved the baffle and corresponded regional hollow fiber membrane bundle's of utilization ratio. Preferably, the central angle of the baffle is 45-75 degrees. So design, can enough guarantee the aperture size of liquid outlet to guarantee the circulation, the processing of baffle of again being convenient for also can accelerate the liquid outflow in the runner simultaneously. Of course, no baffle plate may be provided between the flow channel and the hollow fiber membrane bundle, and the flow channel is formed by a gap between the inner wall of the cylinder and the hollow fiber membrane bundle.
Further, the gap between the inner wall of the cylinder body between the annular shaft shoulder surface and the second sealing element and the outer wall of the hollow fiber membrane bundle is not more than 2 mm. If this clearance is too big, because outermost layer liquid is far away from the hollow fiber membrane bundle, the degasification effect is relatively poor to reduced holistic degasification efficiency, simultaneously, be not more than 2 mm's clearance is favorable to supporting the deformation of hollow fiber membrane bundle in the liquid stream flows the in-process to the inlet end department, avoids it to break or damage.
Furthermore, the axial sectional area of the overflow cavity gradually increases from the side close to the liquid outlet to the side far away from the liquid outlet. By the design, the liquid in the overflow cavity can flow towards the liquid outlet more easily under the action of pressure difference, so that the drainage effect on the liquid is enhanced; in addition, the confluence at the liquid outlet can be facilitated. Wherein axial cross-sectional area in this context refers to the cross-section of the overflow chamber taken by a plane through the central axis of the degassing membrane module.
Furthermore, the annular shaft shoulder surface is an inclined surface which inclines from high to low towards one side of the liquid outlet. So design, when the barrel was put perpendicularly, can further accelerate the speed of liquid flow direction liquid outlet.
Furthermore, the included angle between the annular shaft shoulder surface and a plane perpendicular to the axis of the cylinder body is 0.5-10 degrees. So design can guarantee the drainage effect to liquid, can reduce again that the hollow fiber membrane restraints are close to liquid outlet one side and correspond to the length of overflow chamber part to this deformation degree that reduces its emergence under liquid strikes, thereby avoid its fracture.
Further, the radial width of the annular shoulder surface gradually increases toward the side close to the liquid outlet.
Further, the radial width of the side, away from the liquid outlet, of the annular shoulder surface is W1, the radial width of the side, close to the liquid outlet, of the annular shoulder surface is W2, and the conditions that W1/W2 is 1/5 and 1/3 are met. So design, the machine-shaping of annular shaft shoulder face of being convenient for can promote the drainage effect of overflow chamber to liquid again.
Furthermore, the inner diameter of the cylinder is D, and 1/200 < W1/D < 1/25 is satisfied. By the design, the annular shaft shoulder surface is further convenient to machine and form, and the wall thickness of the barrel and the strength of the barrel wall can be ensured.
Further, the liquid outlet is close to the bottom of runner sets up, the cross-sectional area of runner reduces from entry end to liquid outlet gradually. So design can make liquid all flow out to remaining liquid in avoiding the runner, accelerating the velocity of flow of liquid simultaneously, so that liquid flows out fast.
Further, the height of the overflow cavity is H1, the distance between the first sealing element and the second sealing element is H2, and the requirements of 1/9 < H1/H2 < 1/7 are met. So design, can increase the area of contact of hollow fiber membrane bundle and liquid to further improve degasification efficiency, in addition, can also reduce the deformation degree that hollow fiber membrane bundle is close to liquid outlet one side, avoid its breaking occur and damaged with this, prolong its life.
These features and advantages of the present invention will be disclosed in more detail in the following detailed description and the accompanying drawings.
[ description of the drawings ]
The invention is further described below with reference to the accompanying drawings:
FIG. 1 is a cross-sectional view of a hollow fiber degassing membrane module according to the present invention;
FIG. 2 is a top view of the inner structure of the cylinder in the second embodiment of the present invention;
fig. 3 is a schematic perspective view of a body according to a second embodiment of the present invention.
[ detailed description ] embodiments
The invention provides a hollow fiber degassing membrane component, which comprises a cylinder body and a hollow fiber membrane bundle, wherein a first sealing element and a second sealing element are respectively arranged between two ends of the hollow fiber membrane bundle and the inner wall of the cylinder body, an air outlet is arranged at one end of the cylinder body close to the first sealing element, the air outlet is communicated with one end of the hollow fiber membrane bundle, a liquid inlet is arranged at the other end of the cylinder body, and one end of the hollow fiber membrane bundle close to the liquid inlet is packaged, an axially extending flow passage is formed between the inlet end and the liquid outlet.
Because the inner wall of the cylinder body is provided with the annular shaft shoulder surface which is formed by extending outwards in the radial direction, the gap between the part of the hollow fiber membrane bundle, which is positioned between the annular shaft shoulder surface and the first sealing element, and the inner wall of the cylinder body is larger than the gap between the rest part of the hollow fiber membrane bundle and the inner wall of the cylinder body, namely the pressure in the overflow cavity is smaller, so that liquid is easier to flow into the overflow cavity under the action of pressure difference, and the overflow cavity is communicated with the liquid outlet, so that the discharge of the liquid is accelerated, and the degassing flow rate and the degassing efficiency are effectively improved; in addition, the overflow cavity reduces the flow velocity of liquid, and the setting of the runner of axial extension in addition can play the effect of the liquid of guide overflow intracavity, avoids the direct radial flow of liquid to the liquid outlet and produces great impact force to hollow fiber membrane bundle, has avoided hollow fiber membrane bundle to be close to liquid outlet one side and has taken place fracture or damage from this, has avoided the weeping, has prolonged the life of hollow fiber membrane bundle. Meanwhile, the contact area of the hollow fiber membrane bundle and liquid is increased, so that the utilization rate of the hollow fiber membrane bundle is improved.
The technical solutions of the embodiments of the present invention are explained and illustrated below with reference to the drawings of the embodiments of the present invention, but the following embodiments are only preferred embodiments of the present invention, and not all embodiments. Based on the embodiments in the implementation, other embodiments obtained by those skilled in the art without any creative effort belong to the protection scope of the present invention.
In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "clockwise", "counterclockwise", and the like, indicate orientations and positional relationships based on those shown in the drawings, and are used only for convenience of description and simplicity of description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, are not to be considered as limiting the present invention.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, unless otherwise specified, "a plurality" means two or more unless explicitly defined otherwise.
In the present invention, unless otherwise expressly specified or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
In the present invention, unless otherwise expressly stated or limited, "above" or "below" a first feature means that the first and second features are in direct contact, or that the first and second features are not in direct contact but are in contact with each other via another feature therebetween. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly under and obliquely below the second feature, or simply meaning that the first feature is at a lesser elevation than the second feature.
Referring to fig. 1 to 3, the hollow fiber degassing membrane module of the present embodiment includes a cylinder and a hollow fiber membrane bundle 4, wherein the cylinder includes a first end cap 1, a second end cap 2 and a hollow body 3 which are formed separately, the first end cap 1 is screwed and fixed with one end thread of the body 3, an O-ring is disposed between the first end cap 1 and the outer wall of the body 3, the second end cap 2 is screwed and fixed with the other end thread of the body 3, an O-ring is disposed between the second end cap 2 and the outer wall of the body 3, a liquid inlet and a gas outlet are disposed at two ends of the cylinder respectively, that is, a gas outlet 11 is disposed on the first end cap 1, and a liquid inlet 21 is disposed on the second end cap 2. The hollow fiber membrane bundle 4 is mounted in a cylinder, the hollow fiber membrane bundle 4 is formed by connecting and winding a plurality of hollow fiber tubes by a braided wire, the hollow fiber tubes are hollow fiber-shaped membranes which can permeate gas but cannot permeate liquid, the hollow fiber tubes can be made of polyolefin resin such as polypropylene and poly (4-methylpentene-1), silicon resin such as copolymer of polydimethylsiloxane siloxane, PE, PFA, PTFE, PVDF, vinylidene fluoride, etc. First sealing member 5 and second sealing member 6 are respectively arranged between two ends of hollow fiber membrane bundle 4 and the inner wall of the body, first sealing member 5 is arranged close to air outlet 11, second sealing member 6 is arranged close to liquid inlet 21, first sealing member 5 and second sealing member 6 are one of epoxy resin, polyurethane and PE plastic, hollow fiber membrane bundle 4 is arranged in body 3, first sealing member 5 is filled between hollow fiber tubes and between hollow fiber membrane bundle 4 and the inner wall of the body in an embedding mode to realize the fixation of hollow fiber tubes and the sealing between hollow fiber membrane bundle and the inner wall of the body, at the moment, one end of the hollow fiber tube close to air outlet 11 is opened and communicated with air outlet 11, and the inner side of the hollow fiber tube is decompressed by sucking air from air outlet 11 by using a suction pump to suck air out gas. And the second sealing element 6 is filled in the inner side of the hollow fiber tube, between the hollow fiber tubes and between the hollow fiber membrane bundle 4 and the inner wall of the body in a potting manner so as to realize the fixation and encapsulation of one end of the hollow fiber tube close to the liquid inlet 21 and the sealing between the end and the inner wall of the body. In addition, a liquid outlet 31 is provided on the side wall of the body 3 between the first sealing member 5 and the second sealing member 6.
In the present embodiment, when the hollow fiber degassing membrane module is used, liquid enters the cylinder from the liquid inlet 21 and enters the hollow part of the hollow fiber membrane bundle 4, and then the liquid flows to the outside in the radial direction of the cylinder through the space between the hollow fiber tubes, and at this time, the suction pump is operated to suck air from the air outlet 11 into the cylinder, so that the inside of the hollow fiber tubes is depressurized, so that when the liquid passes through the space between the hollow fiber tubes, gas and bubbles dissolved in the liquid are sucked into the inside of the hollow fiber tubes and discharged from the air outlet 11, thereby degassing is realized, and the degassed liquid is discharged from the liquid outlet 31.
In this embodiment, the side wall of the main body is provided with the axially extending flow channel 9, the flow channel 9 is communicated with the liquid outlet 31, the flow channel 9 has an inlet end arranged toward the gas outlet 11, and the inlet end is located between the first sealing member 5 and the liquid outlet 31, so that liquid can flow out from the liquid outlet 31 after axially flowing into the flow channel 9 from the inlet end, that is, the inner side wall of the flow channel can play a role of separating the hollow fiber membrane bundle 4 from the liquid outlet 31, thereby preventing the liquid from directly flowing to the liquid outlet 31 in the radial direction to generate a large impact force on the hollow fiber membrane bundle 4, thereby preventing the hollow fiber membrane bundle 4 from being dispersed and broken, and prolonging the service life of the hollow fiber membrane bundle 4; in addition, the design can increase the contact area of the hollow fiber membrane bundle 4 and the liquid, thereby improving the degassing efficiency.
In this embodiment, an annular shoulder surface 33 extending radially outward is disposed on a position of the inner wall of the body 3 close to the first sealing element 5, an annular flow channel is formed between the annular shoulder surface 33 and the inner wall of the body 3, or a top of the annular shoulder surface 33 is connected with the inner wall of the body, a part of the annular shoulder surface and the inner wall of the body are spaced to form the above-mentioned axially extending flow channel 9, and an overflow cavity 7 communicating with the flow channel 9 is formed between one side of the annular shoulder surface 33 facing the air outlet 11 and the first sealing element 5. Therefore, the gap between the part of the hollow fiber membrane bundle 4 between the annular shaft shoulder surface 33 and the first sealing element 5 and the inner wall of the body is larger than the gap between the rest part and the inner wall of the body, namely the pressure in the overflow cavity 7 is smaller, so that the liquid can easily flow into the overflow cavity 7 under the action of pressure difference, and the overflow cavity 7 is communicated with the liquid outlet 31 through the axial flow channel 9, so that the discharge of the liquid is accelerated, and the degassing flow rate and the degassing efficiency are effectively improved; in addition, the overflow chamber 7 reduces the flow velocity of the liquid, so that the impact force on the side, close to the liquid outlet 31, of the hollow fiber membrane bundle 4 when the liquid flows out is reduced, the side, close to the liquid outlet 31, of the hollow fiber membrane bundle 4 is prevented from being broken or damaged, liquid leakage is avoided, and the service life of the hollow fiber membrane bundle 4 is prolonged.
In this embodiment, it is preferable that a baffle 32 is provided between the flow channel 9 and the hollow fiber membrane bundle 4, and an end surface of the baffle 32 constitutes a part of the annular shoulder surface 33, and the inlet end is located on a side of the annular shoulder surface 33 away from the hollow fiber membrane bundle 4. By the design, the liquid in the radial corresponding area of the baffle 32 is prevented from directly flowing out of the liquid outlet 9, and the utilization rate of the hollow fiber membrane bundle in the corresponding area of the baffle is improved. The central angle of the baffle is preferably 45-75 degrees. So design, can enough guarantee the aperture size of liquid outlet to guarantee the circulation, the processing of baffle of again being convenient for also can accelerate the liquid outflow in the runner simultaneously. When the central angle β is smaller than 45 °, the arc length of the flow channel 9 is too short, which results in too small aperture of the liquid outlet 31, that is, the flow rate of the liquid outlet 31 is reduced, and the degassing efficiency is reduced; when the central angle beta is larger than 75 degrees, the flow channel is too long, which is not beneficial to the quick discharge of liquid; therefore, in the present embodiment, the central angle β is preferably 60 °, so that the aperture size and the throughput of the liquid outlet can be ensured, the processing of the baffle can be facilitated, and the liquid outflow in the flow channel 9 is accelerated. Of course, the central angle β may alternatively be 45 °, 50 °, 55 °, 65 °, 70 °, 75 °, etc., as long as it is between 45 ° and 75 °, which is within the effective protection scope of the present invention.
Of course, the baffle plate may not be provided between the flow channel and the hollow fiber membrane bundle, and the flow channel is formed by a gap between the inner wall of the cylinder and the hollow fiber membrane bundle.
In the present embodiment, the clearance between the inner wall of the cylinder between the annular shoulder surface 33 and the second seal member 6 and the outer wall of the hollow fiber membrane bundle 4 is not more than 2 mm. If this clearance is too big, because the outermost liquid is far away from hollow fiber membrane bundle 4, the degasification effect is relatively poor to reduced holistic degasification efficiency, simultaneously, be not more than 2 mm's clearance is favorable to supporting hollow fiber membrane bundle 4's deformation in-process at the liquid stream flow to inlet end department, avoids it to break or damage.
The axial sectional area S2 of the side of the overflow cavity 7 close to the liquid outlet 31 is larger than the axial sectional area S1 of the side of the overflow cavity 7 away from the liquid outlet 31, so that the liquid can flow towards the liquid outlet 31 under the action of the pressure difference, thereby enhancing the drainage effect on the liquid; in addition, the axial sectional area S2 of the overflow cavity 7 near the liquid outlet 31 is increased to facilitate the flow convergence at the flow passage 9. Preferably, the axial sectional area of the overflow cavity is gradually increased towards the direction of one side of the liquid outlet. In this way, the liquid can flow more smoothly in the direction of the flow channel 9, thereby improving the drainage effect.
Preferably, the bottom surface of the overflow cavity 7 in this embodiment is an inclined plane inclined from high to low in the axial direction towards one side of the flow channel 9, so designed, when the cylinder is vertically placed, the speed of the liquid flowing to the flow channel 9 can be further increased, and the included angle α between the bottom surface of the overflow cavity 7 and the plane perpendicular to the axis of the cylinder in this embodiment is 0.5-10 °. When the alpha is less than 0.5 degrees, the drainage effect on liquid is poor; when the angle alpha is larger than 10 degrees, the hollow fiber membrane bundle 4 is close to one side of the liquid outlet 31 and the length of the part corresponding to the overflow cavity 7 is longer, so that the hollow fiber membrane bundle is easy to deform greatly under the impact force of liquid, and is broken; for this reason, α is preferably 5 ° in this embodiment, so as to ensure the drainage effect for the liquid and reduce the length of the portion of the hollow fiber membrane bundle 4 near the liquid outlet 31 and corresponding to the overflow cavity 7, thereby reducing the deformation thereof under the impact of the liquid and avoiding the breakage thereof. Of course, α may also be 0.5 °, 1 °, 3 °, 6 °, 8 °, 9 °, 10 °, etc., alternatively, as long as it is between 0.5 ° and 10 °, which are all within the effective protection scope of the present invention.
Preferably, the bottom surface of the overflow chamber 7 is gradually increased toward the side close to the flow channel 9, so as to further increase the difference between S2 and S1, thereby improving the drainage effect. The radial width of the bottom surface of the overflow chamber 7 is further limited in this embodiment: the radial width of the side of the bottom surface of the overflow cavity 7 far away from the liquid outlet 31 is W1, the radial width of the side of the bottom surface of the overflow cavity 7 near the liquid outlet 31 is W2, and the requirements that W1/W2 is more than 1/5 and less than 1/3 are met. When the ratio W1/W2 is not more than 1/5, the processing and the forming of the annular shaft shoulder surface 33 are not facilitated, and when the ratio W1/W2 is not less than 1/3, the difference between the increased S2 and the increased S1 is smaller, and the drainage effect is poorer; therefore, in the embodiment, W1/W2 is preferably 1/4, which not only facilitates the processing and forming of the annular shoulder surface 33, but also improves the drainage effect of the overflow cavity 7 to the liquid. Alternatively, W1/W2 may also be 1/5 or 1/3, as long as it is between 1/5 and 1/3, all of which are within the effective protection scope of the present invention.
On the other hand, the embodiment also satisfies 1/200 < W1/D < 1/25, wherein D is the inner diameter of the body 3, which is the inner diameter of the part of the overflow cavity 7. When W1/D is not more than 1/200, the annular shaft shoulder surface 33 is not facilitated to be machined and formed, the flow rate of the flow channel is small, the degassing efficiency is reduced, when W1/D is not less than 1/25, the wall thickness of the body 3 is thin, the strength is low, and the body is easy to break, therefore, in the embodiment, W1/D is preferably 1/100, and due to the design, the annular shaft shoulder surface 33 can be machined and formed conveniently, and meanwhile, the wall thickness and the strength of the body can be guaranteed. Meanwhile, the occupied inner space of the body 3 is large, the reduction of the number of the woven layers of the hollow fiber membrane bundle 4 is avoided, and the degassing effect is reduced. Alternatively, W1/D may also be 1/200, 1/180, 1/150, 1/120, 1/90, 1/70, 1/50, 1/25, etc., as long as it is between 1/200 and 1/25, all of which are within the effective protection scope of the present invention.
In order to make the liquid flow out completely to avoid the liquid remaining in the flow channel 9, the liquid outlet 31 is disposed near the bottom end of the flow channel 9 in this embodiment, and the cross-sectional area of the flow channel 9 is gradually reduced from top to bottom. So design can accelerate the velocity of flow of liquid to make liquid flow out fast.
In order to improve the degassing efficiency, the distance between the inlet end and the first sealing member 5 is H1, the distance between the first sealing member 5 and the second sealing member 6 is H2, and 1/9 < H1/H2 < 1/7 is satisfied; when H1/H2 is not more than 1/9, the liquid is not beneficial to flowing out quickly, when H1/H2 is not less than 1/7, the degassing efficiency is low, and the side of the hollow fiber membrane bundle 4 close to the liquid outlet 31 is easy to deform to a large extent, so that the hollow fiber membrane bundle is broken or damaged; therefore, in the present embodiment, 1/8 is preferably selected from H1/H2, which is designed to facilitate quick outflow of liquid, increase the contact area between the hollow fiber membrane bundle 4 and the liquid, thereby further improving the degassing efficiency, and reduce the deformation of the hollow fiber membrane bundle 4 near the liquid outlet 31, thereby avoiding breakage and breakage of the hollow fiber membrane bundle and prolonging the service life of the hollow fiber membrane bundle.
In addition, in order to further increase the liquid flowing speed at the side far from the liquid outlet 31 to improve the liquid outlet efficiency, the knitting density of the hollow fiber membrane bundle at the side near the liquid outlet is greater than the knitting density of the hollow fiber membrane bundle at the side far from the liquid outlet in this embodiment.
In addition, in order to facilitate the winding and processing of the hollow fiber membrane bundle 4, the hollow fiber degassing membrane module of the present embodiment further includes a central tube 8, the hollow fiber membrane bundle 4 is wound and fixed on the central tube 8, one end of the central tube 8 close to the air outlet 11 is closed, the other end is communicated with the liquid inlet 21, and a through hole is formed in a side wall of the central tube 8, so that the liquid flows radially toward the hollow fiber membrane bundle 4 through the through hole.
It is to be understood that the first and second sealing members may also be sealing rings interposed between the hollow fiber membrane bundle and the inner wall of the cylinder.
It will be appreciated that the hollow fiber degassing membrane module may also omit the central tube structure, in which case the hollow fiber membrane bundle may be wound around a cylindrical temporary core and bundled into a cylindrical shape, both end portions of the hollow fiber membrane bundle bundled into a cylindrical shape may be fixed, and the temporary core may be drawn out from the hollow fiber membrane bundle of which both end portions are fixed.
While the invention has been described with reference to specific embodiments thereof, it will be understood by those skilled in the art that the invention is not limited thereto, and may be embodied in many different forms without departing from the spirit and scope of the invention as set forth in the following claims. Any modification which does not depart from the functional and structural principles of the present invention is intended to be included within the scope of the claims.
Claims (10)
1. A hollow fiber degassing membrane module comprises a barrel and a hollow fiber membrane bundle, wherein a first sealing element and a second sealing element are respectively arranged between two ends of the hollow fiber membrane bundle and the inner wall of the barrel, an air outlet is formed in one end, close to the first sealing element, of the barrel, the air outlet is communicated with one end of the hollow fiber membrane bundle, a liquid inlet is formed in the other end of the barrel, and one end, close to the liquid inlet, of the hollow fiber membrane bundle is packaged, and a baffle is arranged between the flow channel and the hollow fiber membrane bundle.
2. The hollow fiber degassing membrane module of claim 1 wherein the end face of said baffle forms a portion of an annular shoulder surface, and further wherein said inlet end is located on a side of the annular shoulder surface remote from the bundle of hollow fiber membranes.
3. The hollow fiber degassing membrane module of claim 1 wherein the gap between the inner wall of the cylinder between the annular shoulder surface and the second seal member and the outer wall of the bundle of hollow fiber membranes is no greater than 2 mm.
4. The hollow fiber degassing membrane module of claim 1 wherein the axial cross-sectional area of said overflow chamber increases from the side near said liquid outlet to the side away from said liquid outlet.
5. The hollow fiber degassing membrane module of claim 4 wherein said annular shoulder surface is a sloped surface sloping from high to low toward said liquid outlet port.
6. The hollow fiber degassing membrane module of claim 5 wherein the angle between said annular shoulder surface and a plane perpendicular to the axis of said cylindrical body is between 0.5 ° and 10 °.
7. The hollow fiber degassing membrane module of claim 4 wherein said annular shoulder surface has a radial width that increases toward a side adjacent said liquid outlet port.
8. The hollow fiber degassing membrane module of claim 7 wherein said annular shoulder surface has a radial width W1 on the side away from said liquid outlet port and a radial width W2 on the side close to said liquid outlet port, satisfying 1/5 < W1/W2 < 1/3; or the radial width of the side, away from the liquid outlet, of the annular shaft shoulder surface is W1, the inner diameter of the cylinder body is D, and 1/200 < W1/D < 1/25 is met.
9. The hollow fiber degassing membrane module of claim 1 wherein said liquid outlet is disposed proximate to a bottom end of said flow channel, said flow channel having a cross-sectional area that decreases from said inlet end to said liquid outlet.
10. The hollow fiber degassing membrane module of claim 1, wherein the height of said overflow chamber is H1, the distance between said first seal and said second seal is H2, satisfying 1/9 < H1/H2 < 1/7.
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