A toothed snap-on filter cartridge end cap seal

Abstract

The application discloses a filter cartridge end cover sealing structure with toothed engagement, which comprises a center cylinder of a filter cartridge and a filter core sleeved on the center cylinder. The center cylinder is provided with expansion plugs at two ends respectively. The outer periphery of the expansion plug is provided with an outer toothed part. The filter core is matched with the outer toothed part at one end respectively. The outer side of the two ends of the filter core is respectively provided with an inner toothed part. The inner toothed part is sealed and connected with the expansion plug at one end of the corresponding filter core under the action of a radial force or an axial force. The toothed mechanical engagement mode of the device end cover and the expansion plug is matched with the folding of the filter core cylinder body, the area of the mechanical combined surface is increased, and it is beneficial to maintain sufficient mechanical sealing and combined force. Through the implementation of the above scheme, the application has the advantages of maintaining sealing and combined force at high temperature.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of filter cartridge dust removal, and particularly relates to a filter cartridge end cover sealing structure with toothed engagement. BACKGROUND

[0002] In the filter cartridge dust removal industry, the end cover of the dust removal filter cartridge of a flue gas treatment dust remover is mostly made by coating and filling glue, that is, the filter core and the end cover are sealed by gluing. Since the adhesive is difficult to maintain binding force at high temperature, most dust removal filter cartridges can only be applied to working conditions below 120 DEG C, which greatly limits the development of the filter cartridge industry. SUMMARY

[0003] The present application aims to solve the above technical problems, and provides a filter cartridge end cover sealing structure with toothed engagement, which forms a sealing structure between the filter core and the end cover by toothed mechanical engagement, so that the dust removal filter cartridge can adapt to higher temperatures.

[0004] In order to achieve the above-mentioned purpose, the present application adopts the following technical scheme:

[0005] A filter cartridge end cover sealing structure with toothed engagement, comprising a center tube of a filter cartridge and a filter core sleeved on the center tube, characterized in that the two ends of the center tube are respectively provided with expansion plugs, the outer periphery of the expansion plug is provided with an outer tooth part, the two ends of the filter core are respectively matched with the outer tooth part of the corresponding end, and the outer side of the two ends of the filter core is respectively provided with an inner tooth piece, the inner tooth piece is under the action of a radial force or an axial force, so that the expansion plug is sealingly connected with the corresponding end of the filter core.

[0006] In order to make the end cover and the expansion plug threadedly connected and make the end cover press the filter core to form a seal, and facilitate processing and manufacturing, the further preferred technical scheme has the following: the outer periphery of the expansion plug is provided with an outer bevel gear, the expansion plug is provided with an end cover, the end cover is provided with an inner bevel gear which is engaged with the outer bevel gear of the expansion plug, and the end cover is threadedly connected with the expansion plug by a fastener and presses the expansion plug and the corresponding end of the filter core to form a seal.

[0007] In order to make the end cover and the expansion plug threadedly connected and make the end cover press the filter core to form a seal, and facilitate processing and manufacturing, the further preferred technical scheme has the following: the expansion plug is provided with a plurality of annular array threaded holes, the end cover is provided with a plurality of corresponding through holes, and the end cover is threadedly connected with the expansion plug by a plurality of bolts.

[0008] The end cover and the center tube with the expansion plug are connected by tightening the bolts, the end of the filter core is placed between the end cover and the expansion plug, the end cover and the expansion plug are engaged with the filter core after being tightened by the bolts, and the purpose of sealing is achieved; wherein the circumferential surface of the end cover and the expansion plug is provided with a bevel gear, and the center tube and the end expansion plug are welded or integrally formed according to the selected material.

[0009] In order to control the pressing force when the end cover presses the filter element and form a seal, the further preferred technical solution is that the expansion plug is provided with an internally threaded hole, the internally threaded hole is provided with a stop step at the inner end, the end cover is provided with a stepped cap, the stepped cap is threadedly connected with the expansion plug and is pressed against the end cover.

[0010] In order to control the pressing force when the end cover presses the filter element and form a seal, the further preferred technical solution is that the expansion plug is provided with external straight teeth, the number of the external straight teeth corresponds to the number of the filter element, the end of the filter element can be sleeved on the external straight teeth, the outer side of the two ends of the filter element is provided with an elastic spring sheet, the elastic spring sheet has a structure matched with the filter element and is sleeved on the end of the filter element, the elastic spring sheet can be radially deformed under the action of a radial force to press and seal the filter element against the expansion plug.

[0011] In order to make the elastic spring sheet radially deform and make the filter element be clamped by the elastic spring sheet and the expansion plug, the further preferred technical solution is that the outer side of the elastic spring sheet is provided with a group of radially arranged push rods, each of the push rods is matched with a tooth groove of the elastic spring sheet and radially presses the elastic spring sheet.

[0012] In order to make the push rod stably transmit along the radial direction of the elastic spring sheet, the further preferred technical solution is that the outer side of the external straight teeth of the expansion plug is provided with a ring platform, one end of the ring platform is connected with the expansion plug as a whole and the other end is a separate structure, so that one end of the expansion plug has a ring groove, the filter element is inserted into the expansion plug from the ring groove of the expansion plug, and the ring platform of the expansion plug is provided with a radially arranged stepped guide groove corresponding to each of the push rods, so that the push rod can be installed in the guide groove and slidably matched with the guide groove.

[0013] In order to make the elastic spring sheet radially deform and make the filter element be clamped by the elastic spring sheet and the expansion plug, the further preferred technical solution is that the push rod is a stepped structure, one end of the push rod close to the elastic spring sheet has external teeth, and the other end of the push rod has a semicircular convex surface.

[0014] In order to push the push rod to move along the radial direction and keep clamping the filter element, the further preferred technical solution is that each of the expansion plugs is provided with an end cover, the end cover has an inner ring part and an outer ring part, the inner ring part of the end cover is provided with an external thread, the expansion plug is provided with an internal thread, the end cover is threadedly connected with the expansion plug, and the inner side of the outer ring part of the end cover is provided with a convexly arranged protrusion corresponding to each of the push rods.

[0015] Compared with the prior art, the device end cover and the expansion plug of the present application have a toothed mechanical engagement mode, which matches the folds of the filter cartridge body, increases the area of the mechanical bonding surface, and is beneficial to maintaining sufficient mechanical sealing and bonding force; through the implementation of the above scheme, the present application has the advantages of maintaining sealing and bonding force at high temperature. BRIEF DESCRIPTION OF DRAWINGS

[0016] Figure 1 is an exploded view of the present application;

[0017] Figure 2 is an end view of the upper end cover and the lower end cover of the present application;

[0018] Figure 3 is an end view of the expansion plug of the present application;

[0019] Figure 4 is an assembly view of an embodiment of the present application;

[0020] Figure 5 is an assembly view of a second embodiment of the present application;

[0021] Figure 6 is an exploded view of a third embodiment of the present application;

[0022] In the figure: 1. upper end cover; 2. expansion plug; 21. guide groove; 22. outer straight teeth; 3. center tube; 4. filter core; 5. lower end cover; 6. bolt; 7. stepped cap; 8. stop step; 9. end cover; 91. protrusion; 10. push rod; 11. elastic spring piece. DETAILED DESCRIPTION

[0023] The technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all the embodiments.

[0024] Embodiment one

[0025] As Figures 1-3As shown, a toothed interlocking filter cartridge end cap sealing structure includes a central cylinder 3 of the filter cartridge, with a filter element 4 fitted around the outer periphery of the central cylinder 3. The filter element 4 is a cylinder formed by folding filter media, and the filter element 4 forms annular folds after circumferential folding. Expansion plugs 2 are respectively provided at both ends of the central cylinder 3. The central cylinder 3 and the end expansion plugs 2 are welded together or integrally formed according to the selected material. The outer periphery of the expansion plug 2 is provided with a ring of external conical teeth, and the protruding teeth of the external conical teeth are arranged one-to-one with the folds of the filter element 4. An upper end cap 1 is provided on the expansion plug 2 at the upper end of the central cylinder 3, and a lower end cap 5 is provided on the expansion plug 2 at the lower end of the central cylinder 3. The upper end cap 1 is provided with a ring of internal conical teeth that meshes with the external conical teeth of the expansion plug 2, and the lower end cap 5 is also provided with a ring of internal conical teeth that meshes with the external conical teeth of the expansion plug 2.

[0026] The expansion plug 2 is provided with a plurality of annular array of threaded holes, and the upper end cover 1 and the lower end cover 5 are respectively provided with a plurality of corresponding through holes. The upper end cover 1 and the lower end cover 5 are threadedly connected to the expansion plug 2 by a plurality of bolts 6. The upper end cover 1 and the lower end cover 5 are threadedly connected to the expansion plug 2 by a plurality of bolts 6 and press against the expansion plug 2 and one end of the corresponding filter element 4 to seal.

[0027] like Figure 1 As shown, a filter cartridge end cap sealing structure includes an upper end cap 1, an expansion plug 2, a central cylinder 3, a filter element 4, a lower end cap 5, and connecting bolts 6.

[0028] The expansion plug 2 and the central cylinder 3 are welded together or integrally formed and inserted into the filter element 4. The upper end cover 1 and the lower end cover 5 are placed on the outside of the expansion plug 2 and the filter element 4, and the end cover and the expansion plug are tightened with connecting bolts 6. Since the circumferential surfaces of the upper end cover 1 and the lower end cover 5 have internal conical teeth, while the circumferential surface of the expansion plug 2 has external conical teeth, when they are tightened together, the gap between the tooth surfaces is reduced, thereby achieving a tight meshing of the filter element, so that the outer and inner sides of the filter element form a sealed structure through the upper end cover 1, the expansion plug 2, the central cylinder 3, and the lower end cover 5.

[0029] Example 2

[0030] like Figure 5As shown, in another embodiment, to control the clamping force and form a seal when the upper end cap 1 and the lower end cap 5 press against the filter element 4, the expansion plug 2 is further provided with an internal threaded hole. A stop step 8 is provided on the expansion plug 2 corresponding to the inner end of the internal threaded hole. A stepped pressure cap 7 is provided on both the upper end cap 1 and the lower end cap 5. The stepped pressure cap 7 has a through core hole communicating with the inner hole of the central cylinder 3. The stepped pressure cap 7 is threadedly connected to the expansion plug 2 and presses against the upper end cap 1 or the lower end cap 5. When the stepped pressure cap 7 is threadedly connected to the expansion plug 2, the end of the stepped pressure cap 7 located in the internal threaded hole will press the upper end cap 1 and the lower end cap 5 against the end of the filter element 4 as the thread rotates. When the stepped cap 7 is located at one end of the internal threaded hole and abuts against the stop step 8 of the expansion plug 2, the stepped cap 7 will be unable to continue rotating to increase the clamping force. At the same time, the stepped cap 7 locks with the expansion plug 2, and the upper end cover 1 or the lower end cover 5 is pressed to the corresponding end of the filter element 4 to form a seal. In this way, by pre-calculating the pressing depth and clamping force, the expansion plug 2, the stepped cap 7, the upper end cover 1, and the lower end cover 5 are connected according to the design dimensions and automatically form a clamping force seal. This can prevent excessive pressure from causing deformation of the end face of the filter element 4, or the upper end cover 1 or the lower end cover 5 from failing to form a seal with both ends of the filter element 4 due to insufficient clamping force. It also facilitates manual assembly and avoids inconsistent clamping force caused by different screw-in depths during manual assembly.

[0031] Working principle, such as Figure 4 As shown, when the conical toothed interlocking sealing filter cartridge device is working, the dust-laden gas cannot pass through the conical tooth interlocking surface, but can only enter the filter element 4 through filtration to achieve filtration, and finally the clean gas is discharged through the opening of the upper end cover 1.

[0032] Example 3

[0033] like Figure 6 As shown, since the filter element 4 is formed by folding filter paper, it needs to be matched one-to-one with the outer conical teeth on the outer circumference of the expansion plug 2 during assembly. However, the outer conical teeth of the filter element 4 and the expansion plug 2 have an included angle, which makes it easy for the filter element 4 to be misaligned during assembly. Moreover, this structure of interlocking conical teeth causes radial wrinkles to form at the end of the filter element 4. To change this situation, the circumference of the expansion plug 2 is made into a straight tooth structure, which facilitates the matching of the filter element 4 and the expansion plug 2. Specifically, the outer circumference of the expansion plug 2 has a section of outer straight teeth 22. The number of teeth of the outer straight teeth 22 corresponds one-to-one with the number of wrinkles in the filter element 4. The end of the filter element 4 can be fitted onto the outer straight teeth 22. An elastic spring 11 is provided on the outer side of the end of the filter element 4. The elastic spring 11 has a shape that matches the filter element 4 and is fitted onto the end of the filter element 4. The elastic spring 11 can deform radially under the action of radial force, pressing the filter element 4 against the expansion plug 2.

[0034] The deformation amount of the elastic spring sheet 11 should be controlled according to the fitting gap between the filter core 4 and the expansion plug 2, so that the elastic spring sheet 11 and the expansion plug 2 can clamp the filter core 4, and ensure that the positions between the elastic spring sheet 11 and the filter core 4 and between the expansion plug 2 and the filter core 4 are all kept in close contact, preventing the filter core 4 from having gaps with the expansion plug 2 or the elastic spring sheet 11, and preventing air leakage, which affects the use performance of the filter cartridge;

[0035] In order to make the elastic spring sheet 11 radially deform and clamp the filter core 4 by the elastic spring sheet 11 and the expansion plug 2, the outer side of the elastic spring sheet 11 is provided with a group of radially arranged push rods 10, each of which is matched with the tooth groove of the elastic spring sheet 11, and radially presses the elastic spring sheet 11 to make the elastic spring sheet 11 radially contract inwardly to clamp the filter core 4, and the push rod 10 is provided with external teeth matched with the tooth groove of the elastic spring sheet 11;

[0036] In order to make the push rod 10 stably transmit along the radial direction of the elastic spring sheet 11, the outer straight teeth 22 of the expansion plug 2 are provided with a ring table on the outer side, one end of the ring table is connected with the expansion plug 2 as a whole, and the other end is a separate structure, so that one end of the expansion plug 2 has a ring groove, one side of the ring groove is the outer straight teeth 22 of the expansion plug, and the other side is the ring table, the filter core 4 is inserted into the expansion plug 2 from the ring groove of the expansion plug 2, and the ring table of the expansion plug 2 is provided with a radially arranged stepped guide groove 21 corresponding to each push rod 10, so that the push rod 10 can be installed in and slidably matched with the guide groove 21, the push rod 10 is also a stepped structure, one end of the push rod 10 close to the elastic spring sheet 11 has external teeth, and the other end of the push rod 10 has a semicircular convex surface, and the middle part of each push rod 10 is sleeved with a spring to press on the stepped surface of the guide groove 21, so that the push rod 10 is elastically installed on the expansion plug 2, when the push rod 10 is subjected to an inward radial force, the push rod 10 overcomes the elastic force of the spring to press the elastic spring sheet 11 on the filter core 4, so that the filter core 4 is closely attached to the expansion plug 2 to prevent air leakage, when the push rod 10 is not subjected to a radial force, the push rod 10 rebounds outwardly along the radial direction under the action of the spring, so that the push rod 10 is separated from the elastic spring sheet 11, the elastic spring sheet 11 rebounds, and the filter core 4 can be taken out from between the elastic spring sheet 11 and the expansion plug 2 and replaced;

[0037] In order to prevent the elastic spring sheet 11 from falling off from the expansion plug 2 in an unclamped state, a snap spring can be arranged in the ring groove of the expansion plug 2 to fix the elastic spring sheet 11;

[0038] In order to push the push rod 10 to move along the radial direction and keep clamping the filter core 4, the expansion plug 2 is provided with an end cover 9, the end cover 9 has an inner ring part and an outer ring part, the inner ring part of the end cover 9 is provided with external threads, the expansion plug 2 is provided with internal threads, the end cover 9 is threadedly connected with the expansion plug 2, the inner side of the outer ring part of the end cover 9 corresponds to each push rod 10 and has a convexly arranged protrusion 91, the protrusion 91 is located between two push rods 10 in the initial state, when the end cover 9 is screwed with the expansion plug 2, the protrusion 91 rotates around the axis and abuts against the semicircular convex surface of the push rod 10, the push rod 10 is pushed along the radial direction to press the elastic spring sheet 11, the elastic spring sheet 11 presses the filter core 4 on the expansion plug 2, the deformation of the elastic spring sheet 11 and the deformation of the expansion plug 2 itself make the filter core 4 and the expansion plug 2 can be attached in each position without leakage, that is, the outer teeth of the push rod 10 only abut against the tooth groove position of the elastic spring sheet 11, but due to the deformation of the elastic spring sheet 11 and the expansion plug 2, the tooth top position of the elastic spring sheet 11 will also be deformed to press the filter core 4 on the expansion plug 2, so that the filter core 4 is completely pressed.

[0039] The above is only the preferred specific embodiment of the present application, but the protection scope of the present application is not limited to this, any person skilled in the art can make equivalent replacement or change according to the technical scheme and the inventive concept of the present application within the technical range disclosed by the present application, which should be covered in the protection scope of the present application.

Claims

1. A toothed interlocking filter cartridge end cap sealing structure, comprising a central cylinder of the filter cartridge and a filter element fitted onto the central cylinder, characterized in that, The central cylinder is provided with expansion plugs at both ends, and the expansion plugs are provided with external teeth on their outer periphery. The two ends of the filter element are respectively matched with the external teeth at their corresponding ends. The outer sides of the two ends of the filter element are respectively provided with internal teeth. Under the action of radial force or axial force, the internal teeth make the expansion plugs and the corresponding filter element ends in a sealed connection. The expansion plug has external straight teeth on its outer periphery. The number of teeth on the external straight teeth corresponds one-to-one with the number of pleats on the filter element. The end of the filter element can be fitted onto the external straight teeth. An elastic spring is provided on the outer side of both ends of the filter element. The elastic spring has a structure adapted to the filter element and is fitted onto the end of the filter element. The elastic spring can deform radially under the action of radial force, pressing the filter element against the expansion plug for a sealed connection. The outer side of the elastic spring is provided with a set of radially arranged push rods, each of which cooperates with the tooth groove of the elastic spring, and the elastic spring is pressed against the elastic spring radially; The outer side of the outer straight teeth of the expansion plug has a ring platform. One end of the ring platform is connected to the expansion plug as a whole, and the other end is a separate structure, so that one end of the expansion plug has a ring groove. The filter element is inserted into the expansion plug through the ring groove. The ring platform of the expansion plug has a stepped guide groove arranged radially for each push rod, so that the push rod can be installed in the guide groove and slide in the guide groove.

2. The toothed interlocking filter cartridge end cap sealing structure according to claim 1, characterized in that, The push rod has a stepped structure, with external teeth at one end near the elastic spring and a semi-circular convex surface at the other end.

3. The toothed interlocking filter cartridge end cap sealing structure according to claim 2, characterized in that, Each of the expansion plugs is provided with an end cap, the end cap having an inner ring portion and an outer ring portion, the inner ring portion of the end cap having an external thread, the expansion plug having an internal thread, the end cap being threadedly connected to the expansion plug, and the inner side of the outer ring portion of the end cap having a protruding protrusion corresponding to each of the push rods.

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