Bag filter

Abstract

A bag filter comprises: a housing having a filter chamber, and a liquid inlet interface and a liquid outlet interface communicated with the filter; the tubesheet and the inner wall of the filtering cavity are fixed on the shell in a sealing manner, and a first via hole for the raw material liquid to pass through is formed in the tubesheet; the filter bag comprises a fixing part and a filtering part, the fixing part is hermetically arranged on the tubesheet, and an opening is formed in the inner side of the fixing part; the filtering part divides the filtering cavity into an upstream part and a downstream part; the limiting assembly is provided with a first limiting part surrounding the periphery of the filter bag and a second limiting part arranged on the tubesheet, and the second limiting part is used for limiting the first limiting part in the radial direction. The first limiting part is radially limited through the second limiting part, so that in the filtering process, the first limiting part can be further ensured not to shake or be difficult to shake under the scouring action of fluid, and the first limiting part is ensured not to be damaged and can well support the filter bag.

Description

Technical Field

[0001] The utility model belongs to the technical field of filters, and particularly relates to a bag filter. Background Art

[0002] A bag filter is a pressure type filtering device, mainly composed of a filter barrel body, a filter barrel cover, a perforated plate, filter bags, a filter basket and other components. During filtration, the filtrate is filled into the filter bags, causing the filter bags to unfold. Impurities and particulate matters are intercepted by the filter bags. During this process, the filter bags are supported by the filter basket to enable the filter bags to unfold evenly, and the filtrate is evenly distributed on the inner surface of the filter bags.

[0003] However, currently, the filter basket is often directly fixed on the perforated plate to support the filter bags. However, this structure of the filter basket is prone to swinging under the action of fluid scouring, resulting in the filter bags not being well supported and prone to local excessive pressure and damage. Especially under the swinging action of the filter basket under fluid scouring and the action of its own weight, the connection between the filter basket and the perforated plate will be pulled and deformed, resulting in the filter basket being easily damaged. Further, the filter basket cannot well support the filter bags, and the damaged part of the filter basket is also prone to friction with the filter bags, making the filter bags more likely to be damaged. Summary of the Invention

[0004] The technical problem to be solved by the utility model is to overcome the deficiencies of the prior art and provide a bag filter.

[0005] In order to achieve the above object, the technical solution adopted by the utility model is as follows:

[0006] A bag filter, comprising:

[0007] A housing having a filtration chamber and a liquid inlet interface and a liquid outlet interface communicating with the filter;

[0008] A perforated plate hermetically fixed to the housing on the inner wall of the filtration chamber, and the perforated plate is provided with a first through hole for the raw liquid to pass through;

[0009] Filter bags, including a fixing part and a filtering part. The fixing part is hermetically arranged on the perforated plate, and an opening is formed inside the fixing part; the filtering part divides the filtration chamber into an upstream part and a downstream part;

[0010] It further includes:

[0011] A limiting component having a first limiting part surrounding the outer periphery of the filter bag and a second limiting part arranged on the perforated plate, and the second limiting part is used for radially limiting the first limiting part.

[0012] With such a setting, the outer periphery of the filter bag can be supported by the first limiting part, so as to ensure that the filter bag can be well supported during the liquid filtration process and the pressure at each part of the filter bag is uniform. And the second limiting part is used to radially limit the first limiting part, so as to further ensure that the first limiting part will not shake or is difficult to shake under the scouring action of the fluid during the filtration process. This can avoid the situation that when the filter bag is filtering, the filter bag cannot be well supported inside the shaking first limiting part, resulting in excessive local pressure and easy damage to the filter bag; and it can also avoid the structural damage caused by the shaking of the first limiting part itself, resulting in the first limiting part being unable to support the filter bag well and the damaged part being prone to friction with the filter bag, causing damage to the filter bag.

[0013] Preferably, the second limiting part includes a first limiting cylinder fixed to the bottom end of the flower plate, and the first limiting cylinder is coaxially sleeved with the first limiting part; and / or,

[0014] The second limiting part includes a first slot opened at the bottom end of the flower plate, and the top end of the first limiting part is inserted into the first slot.

[0015] Among them, the second limiting part is used to radially limit the first limiting part. When the second limiting part includes a first limiting cylinder, the first limiting cylinder is coaxially sleeved outside the first limiting part, so as to realize that the first limiting cylinder can radially limit the outside of the top end of the first limiting part; or, the first limiting part is sleeved outside the first limiting cylinder, so that the first limiting cylinder realizes the radial limit of the top end of the first limiting part from the inside, ensuring that the first limiting part can be more stable under the scouring of the liquid and is not easy to shake, so as to better support the filter bag, and at the same time ensure that the first limiting part is not easy to be damaged due to shaking, so that the filter bag can be well supported and not easy to be damaged; or the second limiting part includes a first slot opened at the bottom end of the flower plate, and the first limiting part is inserted into the first slot, so as to realize the radial limit of the first limiting part through the first slot, so as to ensure that the first limiting part is more not easy to shake, so as to ensure that the first limiting part can well support the filter bag, so that the filter bag is not easy to be damaged; or, the second limiting part includes both a first limiting cylinder and a first slot at the same time, and through the cooperation of the first limiting cylinder and the first slot, the limiting of the first limiting part is jointly realized, so as to realize that the first limiting part can have a better supporting effect on the filter bag.

[0016] Preferably, a support plate is detachably and fixedly connected inside the housing, and the first limiting part is located above the support plate and is supported by the support plate.

[0017] With such a setting, the support plate can support the first limiting portion, so that when the inner bottom wall of the housing has different shapes, the support plate can well support the first limiting portion; and since the support plate is detachable, it is convenient for the installation and disassembly of the first limiting portion.

[0018] Preferably, the support plate is movably connected to the first limiting portion, and the limiting component includes a third limiting portion.

[0019] The third limiting portion includes a second limiting cylinder fixed on the support plate, and the second limiting cylinder sleeve is coaxially sleeved with the bottom end of the first limiting portion; and / or

[0020] The third limiting portion includes a second slot opened on the support plate, and the bottom end of the first limiting portion is inserted into the second slot.

[0021] With such a setting, through the movable connection between the support plate and the first limiting portion, when the first limiting portion is damaged, it is convenient to replace the first limiting portion. And when the support plate is movably connected to the first limiting portion, the third limiting portion can be used to radially limit the bottom end of the first limiting portion, so as to ensure that the first limiting portion remains stable under the action of fluid scouring. And the third limiting portion can be a second limiting cylinder, and the second limiting cylinder can be coaxially arranged inside or outside the first limiting portion to radially limit the bottom end of the first limiting portion; or the third limiting portion can be a second slot opened on the top of the support plate. By inserting the first limiting portion into the second slot and cooperating with the second slot, the radial limit of the bottom end of the second limiting cylinder is realized; or, the third limiting portion includes a second slot and a second limiting cylinder. Through the cooperation of the second limiting cylinder and the second slot with the first limiting portion at the same time, the radial limit of the bottom end of the first limiting portion is realized.

[0022] Preferably, a first annular groove is opened at the bottom end of the perforated plate, and the first limiting cylinder is inserted into the first annular groove; and / or

[0023] A second annular groove is opened at the top end of the support plate, and the second limiting cylinder is inserted into the second annular groove.

[0024] Among them, through the cooperation between the first limiting cylinder and the first annular groove, the fixing effect of the first limiting cylinder itself can be improved, so as to realize that the first limiting cylinder can better radially limit the top end of the first limiting portion, so as to realize that the first limiting portion can better support the filter bag; the cooperation between the second annular groove and the second limiting cylinder can make the fixing effect between the second limiting cylinder and the support plate better, so as to realize that the second limiting cylinder can better radially limit the bottom end of the first limiting portion, thus ensuring that the first limiting portion can better support the filter bag.

[0025] Preferably, a support surface is provided at the top end of the support plate to support the bottom end of the filter bag.

[0026] With such a setting, the support plate can support the bottom end of the filter bag, thereby avoiding the occurrence of damage to the bottom end of the filter bag caused by the scouring effect of the liquid.

[0027] Preferably, the liquid outlet interface is located below the support plate, and a plurality of liquid discharge holes are formed in the support plate, so that the liquid on the upper side of the support plate flows to the lower side of the support plate through the liquid discharge holes, and at least one liquid discharge hole is located inside the second limiting cylinder.

[0028] With such a setting, it is applicable to the structure where the liquid outlet interface is located at the bottom end of the housing, so as to realize that the liquid at the top end of the support plate can be transferred to the bottom end of the support plate through the liquid discharge holes; and liquid discharge holes are also provided inside the second limiting cylinder, so as to realize timely discharge of the liquid inside the second limiting cylinder.

[0029] Preferably, a groove is formed at the bottom end of the support plate, the top end of the groove is communicated with a plurality of liquid discharge holes, and the bottom end of the groove is communicated with the liquid discharge port.

[0030] With such a setting, the groove can communicate with a plurality of liquid discharge holes, so that the liquid at the top end of the support plate can enter the groove through the liquid discharge holes, and then be discharged through the liquid discharge interface, so that the bottom end of the support plate can be set to fit the inner bottom wall of the housing, thereby realizing reduction of the space inside the housing and reduction of the size of the housing.

[0031] Preferably, both the flower plate and the support plate are made of corrosion-resistant plastic material, or both the flower plate and the support plate include a hard inner core and a fluorine lining layer wrapped outside the hard inner core.

[0032] With such a setting, the corrosion-resistant plastic material ensures that the flower plate and the support plate have good corrosion resistance, which is suitable for filtering some corrosive liquids. The corrosion-resistant plastic material can be materials such as PTFE and PFA; or both the flower plate and the support plate have good anti-corrosion performance through the fluorine lining layer on the outside.

[0033] Preferably, the first limiting portion is a barrel body with an open top end, and the side wall of the barrel body includes an upper limiting section, a liquid discharge section and a lower limiting section. The upper limiting section, the liquid discharge section and the lower limiting section are arranged in sequence from top to bottom, and only a plurality of liquid permeable holes are formed in the liquid discharge section.

[0034] With such a setting, the first limiting portion can support the filter bag, and a part of the filtered liquid will be discharged from the liquid permeable holes. No liquid permeable holes are provided in the upper limiting section and the lower limiting section. On the one hand, it is convenient for the processing of the barrel body, and on the other hand, it can make the structural strength of the upper limiting section and the lower limiting section greater. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] To more clearly illustrate the technical solutions of the embodiments of the present utility model, the accompanying drawings of the embodiments will be briefly introduced below. Obviously, the accompanying drawings in the following description only relate to some embodiments of the present utility model and do not limit the present utility model.

[0036] Figure 1 Schematic diagram of the overall structure of the first embodiment of the present utility model;

[0037] Figure 2 Schematic diagram of the connection structure of the ceiling board, support board and limit components in the first embodiment of the present utility model;

[0038] Figure 3 For Figure 2 Enlarged structure diagram at position A in

[0039] Figure 4 For Figure 2 Enlarged structure diagram at position B in

[0040] Figure 5 For Figure 2 Enlarged structure diagram at position C in

[0041] Figure 6 Schematic diagram of the structure when the bottom end of the first limit part is fixed to the support board in the first embodiment of the present utility model;

[0042] Figure 7 Schematic diagram of the partial structure of the second embodiment of the present utility model;

[0043] Figure 8 Schematic diagram of the partial structure when only the third slot is provided in the third embodiment of the present utility model;

[0044] Figure 9 Schematic diagram of the partial structure when both the first slot and the first limit cylinder are provided in the third embodiment of the present utility model;

[0045] Figure 10 Schematic diagram of the partial structure of the fourth embodiment of the present utility model;

[0046] Figure 11 Schematic diagram of the partial structure when only the second slot is provided in the fifth embodiment of the present utility model;

[0047] Figure 12 Schematic diagram of the partial structure when both the second slot and the second limit cylinder are provided in the fifth embodiment of the present utility model.

[0048] Reference numerals: 1, housing; 11, liquid inlet interface; 12, liquid outlet interface; 13, barrel body; 14, top cover; 15, base; 2, flower plate; 21, first through hole; 22, first annular groove; 3, filter bag; 31, fixing part; 32, filtering part; 4, limiting assembly; 41, first limiting part; 411, upper limiting section; 412, liquid drainage section; 413, lower limiting section; 42, first limiting cylinder; 43, first slot; 44, second limiting cylinder; 45, second slot; 5, support plate; 51, second annular groove; 52, liquid drainage hole; 53, groove; 6, pressing plate. Detailed implementation manners

[0049] To make the objectives, technical solutions and advantages of the embodiments of the present utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings. The components of the embodiments of the present utility model described and illustrated in the drawings here can be arranged and designed in various different configurations. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without creative efforts fall within the scope of protection of the present utility model.

[0050] It should be noted that: Similar reference numerals and letters denote similar items in the following drawings. Therefore, once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings.

[0051] Unless otherwise defined, the technical terms or scientific terms used in this patent document should have the ordinary meanings understood by those of ordinary skill in the art to which the present utility model belongs. The "first", "second" and similar terms used in the patent specification and claims of the present utility model do not denote any order, quantity or importance, but are only used to distinguish different components. Similarly, the similar terms such as "a", "an" or "the" do not denote a quantity limitation, but mean that there is at least one. The terms such as "including" or "comprising" mean that the elements or objects appearing before "including" or "comprising" cover the elements or objects listed after "including" or "comprising" and their equivalents, and do not exclude other elements or objects. The terms such as "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. are only used to represent relative positional relationships. When the absolute position of the object being described changes, the relative positional relationship may also change accordingly. It is only for the convenience of describing the present utility model 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 thus cannot be construed as a limitation of the present utility model.

[0052] The following will describe in detail some embodiments of the present utility model with reference to the accompanying drawings. Without conflict, the features in the following embodiments can be combined with each other.

[0053] Example 1

[0054] Refer to Figure 1 、 Figure 2 , a bag filter, including a housing 1, the housing 1 having a filtering chamber and a liquid inlet interface 11 and a liquid outlet interface 12 communicating with the filter.

[0055] The structure of the housing 1 includes a barrel body 13 and a top cover 14 and a bottom base 15 located at the upper and lower ends of the barrel body 13. The barrel body 13 and the top cover 14 and the bottom base 15 are all detachable connection structures. For example, between the barrel body 13 and the top cover 14, and between the barrel body 13 and the bottom base 15, detachable fixed connection can be achieved through a flange structure.

[0056] A perforated plate 2 is fixedly connected inside the housing 1 in a sealed manner. The perforated plate 2 is clamped between the barrel body 13 and the top cover 14, and sealing gaskets can be provided on both the upper and lower sides of the perforated plate 2 to improve the sealing effect between the perforated plate 2 and the barrel body 13 and the bottom base 15.

[0057] The perforated plate 2 is provided with a first through hole 21. The liquid inlet interface 11 is located above the perforated plate 2, and the liquid outlet interface 12 is located below the perforated plate 2. The raw material enters the interior of the housing 1 from the liquid inlet interface 11 and then flows through the first through hole 21 to the lower side of the perforated plate 2.

[0058] Refer to Figure 2 , a filter bag 3 is fixedly connected to the perforated plate 2. The top end of the filter bag 3 is provided with an opening so that the stock solution enters the interior of the filter bag 3 from the opening, is filtered by the filter bag 3, the particulate matter is retained inside the filter bag 3, and the liquid filtered by the filter bag 3 is discharged from the liquid outlet interface 12.

[0059] Among them, refer to Figure 2 and Figure 3 , the filter bag 3 includes a fixing part 31 and a filtering part 32. The fixing part 31 has an opening. The filtering part 32 is used for filtering the stock solution and divides the filtering chamber into an upstream part and a downstream part. The stock solution is located in the upstream part, and the filtered liquid is located in the downstream part.

[0060] The connection structure between the filter bag 3 and the perforated plate 2 is: a stepped structure is provided at the top end of the perforated plate 2. The stepped structure is annular and coaxially arranged with the first through hole 21, and a pressing plate 6 is fixedly connected to the step through a threaded structure. The fixing part 31 is pressed and fixed between the pressing plate 6 and the stepped structure to realize the fixing of the filter bag 3. And the filtering part 32 of the filter bag 3 passes through the opening until it is located below the perforated plate 2.

[0061] Of course, the stepped structure can also be provided on the lower side of the perforated plate 2, or the filter bag 3 can be fixed to the perforated plate 2 in a detachable manner through other structures.

[0062] Refer toFigure 1 and Figure 2 The bag filter further includes a limiting component 4. The limiting component 4 has a first limiting part 41 that wraps around the outer periphery of the filter bag 3. By means of the first limiting part 41, the outer periphery of the filter bag 3 can be supported, ensuring that when the filter bag 3 filters the liquid, the pressure at each part can be evenly distributed, avoiding the situation that the local pressure of the filter bag 3 is too large, which may easily cause damage to the filter bag 3 and other problems.

[0063] Specifically, referring to Figure 3 , the first limiting part 41 is a cylindrical structure with an open top. The cylindrical structure is sleeved on the outer periphery of the filter bag 3, and liquid-permeating holes are provided on the side wall of the cylinder to support the filter bag 3 through the cylinder.

[0064] Of course, the bottom end of the cylindrical structure can be an open structure or a non-open structure.

[0065] When the bottom end is a non-open structure, it is preferably provided with a plurality of openings to facilitate the discharge of liquid from the openings at the bottom end.

[0066] Furthermore, referring to Figure 1 , the side wall of the cylinder includes an upper limiting section 411, a liquid-draining section 412, and a lower limiting section 413. The upper limiting section 411, the liquid-draining section 412, and the lower limiting section 413 are arranged in sequence from top to bottom, and only a plurality of liquid-permeating holes are provided in the liquid-draining section 412 to improve the structural strength of the upper and lower ends of the first limiting part 41.

[0067] And further, the first limiting part 41 supports its own weight through the bottom end. For example, the first limiting part 41 is directly placed or fixed on the inner bottom wall of the housing 1. Compared with the structure where the first limiting part 41 is fixed on the flower plate 2, it can better avoid the top connection of the first limiting part 41 being stretched due to its own weight, thereby avoiding damage to the connection structure.

[0068] A support plate 5 can also be detachably and fixedly connected inside the housing 1. The first limiting part 41 is located above the support plate 5 and is supported by the support plate 5, so as to realize good support for the first limiting part 41 through the support plate 5. And when the support plate 5 is provided, the inner bottom surface of the housing 1 can be a flat structure or a conical structure, so that the fixing and placement of the first limiting part 41 are not affected by the inner bottom wall of the housing 1.

[0069] At the same time, the bottom end of the first limiting part 41 can be fixedly connected to the support plate 5 (refer to Figure 6 ), or it can only be set in contact (refer to Figure 1 ).

[0070] Furthermore, the support plate 5 is located between the barrel body 13 and the base 15. The barrel body 13 and the base 15 are fixed through a flange structure, and the support plate 5 is clamped and fixed between them. Sealing gaskets can also be provided at the joints of the support plate 5 with the barrel body 13 and the base 15 to ensure the sealing effect at the joints.

[0071] The above-mentioned limiting component 4 also has a second limiting part, and the second limiting part is used for radially limiting the first limiting part 41. Thus, when the first limiting part 41 supports the outer periphery of the filter bag 3, the first limiting part 41 itself will not shake due to the scouring of the liquid, or the shaking amplitude of the first limiting part 41 is small under the scouring action of the liquid. Firstly, during the support process, it can ensure a better support effect for the filter bag 3, ensure the pressure at each part of the filter bag 3, and avoid situations such as excessive local pressure occurring during the filtration of the filter bag 3 due to the shaking of the first limiting part 41; secondly, it can ensure that the first limiting part 41 is not easily damaged due to shaking during use, thereby avoiding the situation that the first limiting part 41 is damaged and cannot support the filter bag 3 well, or even the filter bag 3 is damaged due to the friction of the damaged part on the filter bag 3.

[0072] Here, the radial limit, taking the first limiting part 41 as a cylindrical structure, this radial direction is the radial direction of the cylinder body. Figure 1 For example, this radial direction is in the horizontal direction, that is, to ensure that the first limiting part 41 cannot shake left and right.

[0073] Specifically, referring to Figure 2 、 Figure 3 and Figure 4 , the second limiting part includes a first limiting cylinder 42 fixed to the bottom end of the tube sheet 2. The first limiting cylinder 42 is coaxially sleeved outside the first limiting part 41 to realize the radial limit for the first limiting part 41, ensure that the first limiting part 41 cannot shake or is difficult to shake, and the shaking amplitude is low.

[0074] Referring to Figure 4 , a first annular groove 22 can also be opened at the bottom end of the tube sheet 2. The first limiting cylinder 42 is inserted into the first annular groove 22 and then welded to the tube sheet 2, so as to realize that the first limiting cylinder 42 can be more firmly fixed on the tube sheet 2 and the first limiting cylinder 42 itself can have good stability. Thus, when the first limiting cylinder 42 radially limits the first limiting part 41, at this time, the first limiting cylinder 42 can better ensure that the first limiting part 41 is difficult to shake.

[0075] Referring to Figure 1, the support plate 5 is movably connected to the first limiting part 41. When the support plate 5 and the first limiting part 41 are only in contact with each other, the above-mentioned limiting component 4 may further include a third limiting part. The third limiting part includes a second limiting cylinder 44 fixed on the support plate 5. The second limiting cylinder 44 is coaxially sleeved with the bottom end of the first limiting part 41, and the second limiting cylinder 44 is located outside the first limiting part 41 to limit the bottom end of the first limiting part 41 radially, so as to ensure that the first limiting part 41 can support the filter bag 3 more stably. At the same time, the support plate 5 and the first limiting part 41 are only in contact and separable, which can realize the convenient replacement of the first limiting part 41 when the first limiting part 41 is damaged.

[0076] Referring to Figure 5 , a second annular groove 51 may be opened at the top end of the support plate 5. The second limiting cylinder 44 is inserted into the second annular groove 51, and then the second limiting cylinder 44 and the support plate 5 are welded to each other, so as to realize that the second limiting cylinder 44 can be fixed on the support plate 5 more stably. When the second limiting cylinder 44 limits the first limiting part 41, it can better ensure that the first limiting part 41 does not shake or the like.

[0077] In order to support the bottom end of the filter bag 3, the distance between the support plate 5 and the flower plate 2 can enable the bottom end of the filter bag 3 to contact the top end of the support plate 5, so as to realize that the support surface at the top end of the support plate 5 can support the bottom end of the filter bag 3, so as to ensure that the bottom end of the filter bag 3 is not easily damaged during the filtering process.

[0078] Referring to 1 and Figure 2 , when the liquid outlet interface 12 is located below the support plate 5, a plurality of liquid discharge holes 52 are opened on the support plate 5, so that the liquid on the upper side of the support plate 5 flows to the lower side of the support plate 5 through the liquid discharge holes 52. And at least one liquid discharge hole 52 is located inside the second limiting cylinder 44, so as to realize that the liquid inside the second limiting cylinder 44 can also be directly discharged through the liquid discharge hole 52 located inside the second limiting cylinder 44.

[0079] Further, a groove 53 is opened at the bottom end of the support plate 5. The top end of the groove 53 is communicated with a plurality of liquid discharge holes 52, and the bottom end of the groove 53 is communicated with the liquid discharge port, so as to realize that when the bottom end of the support plate 5 is completely attached to the bottom surface of the housing 1, the filtrate can also enter the groove 53 through the liquid discharge holes 52 and then enter the liquid discharge holes 52. That is, the volume of the base 15 of the housing 1 can be reduced, that is, the volume of the housing 1 can be reduced while realizing good discharge of the filtrate.

[0080] The perforated plate 2 and the support plate 5 in this filter are both made of corrosion-resistant plastic materials, such as PTFE and PFA, etc., so that this filter can be used to filter some corrosive liquids. Or, the perforated plate 2 and the support plate 5 both include a hard inner core and a fluorine-lined layer wrapped outside the hard inner core, so that the perforated plate 2 and the support plate 5 have good corrosion resistance while having good structural strength, so that they can be used to filter corrosive liquids while avoiding the situation that there are multiple filter bags 3 structures inside the device and the structure will not be deformed.

[0081] Similarly, a fluorine-lined layer can be provided on the inner wall of the housing 1 to improve the corrosion resistance of the housing 1.

[0082] Similarly, the first limiting part 41, the first limiting cylinder 42 and the second limiting cylinder 44 can all be made of corrosion-resistant plastics such as PTFT or PFA to ensure that each structure has good corrosion resistance.

[0083] And it should be noted that when the first limiting part 41 is made of plastic material, at this time the corrosion resistance of the first limiting part 41 is stronger than that of metal material, but the strength will be reduced. In this case, if the structure of directly fixing the filter basket on the perforated plate 2 is adopted, under the action of the self-weight of the filter basket and the swing of the filter basket due to liquid scouring, the filter basket is more likely to be damaged. In the present utility model, through the radial limiting of the first limiting part 41, it can be realized that the first limiting part 41 is not easy to swing, and the structural strength requirement for the first limiting part 41 is lower, that is, the structure of the present utility model is more suitable for the corrosion-resistant bag filter.

[0084] Embodiment Two

[0085] The difference from Embodiment One is: Refer to Figure 7 , the second limiting part includes a first limiting cylinder 42 fixed to the bottom end of the perforated plate 2, and the first limiting part 41 is sleeved outside the first limiting cylinder 42, so that the first limiting cylinder 42 supports and limits the first limiting part 41 from the inside.

[0086] Embodiment Three

[0087] The difference from Embodiment One or Embodiment Two is: Refer to Figure 8 , the second limiting part can also be a first slot 43 opened at the bottom end of the perforated plate 2, and the top end of the first limiting part 41 is inserted into the slot to limit the first limiting part 41, so that the first limiting part 41 cannot shake or is difficult to shake through this structure.

[0088] At this time, the first slot 43 can exist alone to limit the first limiting part 41 (such as Figure 8(as shown), or the second limiting cylinder may also include the first slot 43 and the first limiting cylinder 42 (as Figure 9 shown). The first limiting cylinder 42 and the first slot 43 simultaneously perform radial limiting on the first limiting portion 41 to better limit the top end of the first limiting portion 41 and ensure that the first limiting portion 41 is less likely to be damaged.

[0089] Embodiment 4

[0090] The difference from Embodiment 1 is that with reference to Figure 10 , the third limiting portion includes a second limiting cylinder 44 fixed on the support plate 5, but the second limiting cylinder 44 is located inside the first limiting portion 41 to realize radial limiting of the bottom end of the first limiting portion 41 from the inside by the second limiting cylinder 44.

[0091] Embodiment 5

[0092] The difference from Embodiment 1 or Embodiment 4 is that with reference to Figure 11 , the third limiting portion includes a second slot 45 fixed on the support plate 5, and the bottom end of the first limiting portion 41 is inserted into the second slot 45 to cooperate with the second slot 45 to realize radial limiting of the bottom end of the first limiting portion 41.

[0093] At this time, the bottom end of the first limiting portion 41 is an open structure to enable the bottom end of the first limiting portion 41 to cooperate with the second slot 45.

[0094] At this time, the third limiting portion may only include the second slot 45 (as Figure 11 ), or may also include the second slot 45 and the second limiting cylinder 44 simultaneously (as Figure 12 ). The second slot 45 and the second limiting cylinder 44 jointly perform radial limiting on the bottom end of the first limiting portion 41 to achieve a better limiting effect on the bottom end of the first limiting portion 41 and ensure that the first limiting portion 41 is less likely to be damaged.

[0095] The above is only the specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be easily thought of by those skilled in the art within the technical scope disclosed by the present invention should be covered by the protection scope of the present invention. Therefore, the protection scope of the present invention should be subject to the protection scope of the claims.

Claims

1. A bag filter, comprising: A housing having a filter cavity and a liquid inlet and a liquid outlet connected to the filter; A flower plate is fixed on the housing in a sealed manner with the inner wall of the filter cavity, and the flower plate is provided with a first through hole for the raw material liquid to pass through; The filter bag comprises a fixing part and a filtering part, wherein the fixing part is sealed and arranged on the flower plate, and an opening is formed inside the fixing part; the filtering part separates the filtering cavity into an upstream part and a downstream part; It is characterized by further comprising: The limiting component comprises a first limiting portion wrapped around the outer periphery of the filter bag and a second limiting portion arranged on the flower plate, wherein the second limiting portion is used for radially limiting the first limiting portion.

2. The bag filter according to claim 1, characterized in that: The second limiting portion comprises a first limiting cylinder fixed to the bottom end of the flower plate, and the first limiting cylinder is coaxially sleeved with the first limiting portion; and / or, The second limiting portion includes a first slot formed at the bottom end of the flower plate, and the top end of the first limiting portion is inserted into the first slot.

3. The bag filter according to claim 2, characterized in that: A support plate is detachably fixedly connected to the interior of the shell, and the first limiting portion is located above the support plate and supported by the support plate.

4. The bag filter according to claim 3, characterized in that: The support plate is movably connected to the first limiting portion, and the limiting assembly includes a third limiting portion. The third limiting portion comprises a second limiting cylinder fixed on the support plate, wherein the second limiting cylinder is coaxially sleeved with the bottom end of the first limiting portion; and / or, The third limiting portion includes a second slot fixed on the support plate, and the bottom end of the first limiting portion is inserted into the second slot.

5. The bag filter according to claim 4, characterized in that: The bottom end of the flower plate is provided with a first annular groove, and the first limiting cylinder is inserted into the first annular groove; and / or, A second annular groove is formed at the top of the support plate, and the second limiting cylinder is inserted into the second annular groove.

6. The bag filter according to claim 3, characterized in that: The top end of the support plate is provided with a support surface to support the bottom end of the filter bag.

7. The bag filter according to claim 3, characterized in that: The liquid outlet interface is located at the lower side of the support plate, and a plurality of drainage holes are provided on the support plate so that the liquid on the upper side of the support plate flows to the lower side of the support plate through the drainage holes, and at least one drainage hole is located inside the second limiting cylinder.

8. The bag filter according to claim 7, characterized in that: A groove is provided at the bottom end of the support plate, the top end of the groove is connected to a plurality of drainage holes, and the bottom end of the groove is connected to the drainage port.

9. The bag filter according to claim 3, characterized in that: The flower plate and the support plate are both made of corrosion-resistant plastic material, or the flower plate and the support plate both include a hard inner core and a fluorine lining layer wrapped around the outer side of the hard inner core.

10. The bag filter according to claim 1, characterized in that: The first limiting portion is a cylinder body with an opening at the top, and the side wall of the cylinder body includes an upper limit section, a liquid discharge section and a lower limit section, which are distributed in sequence from top to bottom, and a plurality of liquid permeable holes are only opened in the liquid discharge section.

Images