Filter

Abstract

A filter is characterized in that a sealing boss is formed in the center of the bottom of a first containing cavity, a connecting hole communicated with a first channel is formed in the sealing boss, and an obliquely-arranged first sealing face is formed on the outer side wall of the sealing boss; a limiting step is formed on the inner side wall of the first accommodating cavity; an inclined second sealing face is formed on the inner side wall of the connector, a limiting boss is formed on the periphery of the first end cover, the connector of the first end cover is arranged outside the sealing boss in a sleeving mode, the second sealing face and the first sealing face extrude each other to form sealing, and the first end cover is connected with the limiting step of the first shell in a limiting and clamping mode through the limiting boss. The filter element has the advantages that parts are reduced, the cost is reduced, the structure is simpler, the filter element is more convenient to mount, and the sealing performance is more stable and reliable.

Description

Technical Field

[0001] The utility model relates to the technical field of filtration, in particular to a filter. Background Art

[0002] Filters are used as fluid separation devices to control impurities in industrial processes. They are widely used in the food, beverage, pharmaceutical, biotechnology, semiconductor and other industries to purify and remove impurities from fluids. Generally, a filter consists of a filter element and a filter housing, with the filter element being placed inside the filter housing.

[0003] A filter element typically consists of a central rod, a filter membrane positioned outside the rod, and end caps secured to each end of the rod. One end cap is closed, while the other has an opening that connects to the interior of the central rod. The opening extends circumferentially around the outer periphery of the opening to form an interface. A sealing ring is located on the outer wall of the interface, through which the filter element connects to the filter housing and forms a seal. However, during the filtration process, the filter element may experience a certain amount of radial movement due to the constant impact of the fluid. Accumulated movement can lead to leakage or even separation of the filter element from the filter housing.

[0004] For example, an integrated filter disclosed in Chinese utility model patent CN219272407U includes a filter portion for installing a filter element; the upper end surface of the filter portion is provided with a conveying portion for conveying a medium to be processed to the filter element, and the lower end surface of the conveying portion is provided with a mounting groove for mounting the upper end of the filter element; the lower end surface of the filter portion is provided with an output portion for conveying the medium filtered by the filter element, and a spring is provided between the upper end of the output portion and the filter element to support the lower end of the filter element; the conveying portion and the output portion are both non-detachably connected to the filter portion, and the conveying portion and the output portion are both provided with external threads, through which the filter is connected to the medium conveying pipeline.

[0005] The aforementioned integrated filter incorporates an additional spring as auxiliary support to ensure structural stability. During assembly, the delivery and filtration sections are welded together, followed by an O-ring installed around the top of the filter element. The filter element is then inserted into the mounting slot. The spring is then welded to the delivery section, and finally to the filtration section, completing the integrated structure. While the spring provides a more stable structure, it also adds additional components and a welding process, resulting in higher costs. Utility Model Content

[0006] In order to overcome the deficiencies of the background technology, the utility model provides a filter.

[0007] The technical solution adopted by the utility model is: a filter, comprising:

[0008] A first housing having a first accommodating cavity and a first channel;

[0009] A second housing having a second accommodating cavity and a second channel, wherein the second housing is fixedly connected to the first housing, and the first accommodating cavity and the second accommodating cavity together form a filter cavity;

[0010] The filter element is arranged in the filter cavity and comprises at least a first end cover, wherein the first end cover is sealedly connected to the first shell and forms an interface connecting the first channel and the hollow interior of the filter element.

[0011] A sealing boss is formed at the center of the end of the first accommodating cavity, the sealing boss is formed with a connecting hole communicating with the first channel, and an outer side wall of the sealing boss is formed with an inclined first sealing surface; an inner side wall of the first accommodating cavity is formed with a limiting step;

[0012] The inner side wall of the interface forms a second sealing surface arranged at an angle, and a limiting boss is formed on the outer periphery of the first end cover. The interface of the first end cover is sleeved outside the sealing boss, and the second sealing surface and the first sealing surface are squeezed against each other to form a seal, and the first end cover is limitedly engaged with the limiting step of the first shell through the limiting boss.

[0013] Compared with the existing technology, not only the spring as auxiliary support is omitted, but also the O-ring is omitted, which not only reduces parts and reduces costs, but also has a simpler structure, more convenient filter element installation, and more stable and reliable sealing performance.

[0014] Preferably, the first sealing surface and the second sealing surface are both conical surfaces, and the taper of the first sealing surface is smaller than the taper of the second sealing surface, so that the first sealing surface and the second sealing surface can form a more reliable seal.

[0015] Preferably, the side wall of the first accommodating cavity close to one end of the opening is a tapered wall, the end of the tapered wall forms the limiting step, and the tapered wall is tapered in the direction from the opening to the limiting step.

[0016] Since the tapered wall forms a tapered structure, the first end cap of the filter element can be inserted better, and the installation operation is easier and more convenient. Similarly, the outer side wall of the limiting boss can also be a bevel structure, which is more conducive to the installation operation.

[0017] Preferably, the first shell and the second shell are both made of metal, such as stainless steel, which has the characteristics of high strength, corrosion resistance, suitability for use in humid environments, and extended service life.

[0018] Preferably, a first threaded joint is formed at the end of the first housing, and a second threaded joint is formed at the end of the second housing, to facilitate connection of the filter to the fluid pipeline. Furthermore, the outer wall of the second housing is formed with at least one polygonal operating boss, to further facilitate assembly and disassembly of the filter from the fluid pipeline.

[0019] Preferably, the first and second shells are welded into an integrated structure, which not only provides a simple and stable structure, low cost, but also has excellent sealing performance. Furthermore, the ends at which the first and second shells are connected to each other are formed with corresponding positioning recesses and positioning bosses. The first and second shells are positioned and matched by the positioning recesses and positioning bosses, which not only improves concentricity but also facilitates welding operations.

[0020] Preferably, the flow area of ​​the outlet end of the second channel gradually expands along the flow direction, which can enable the fluid to quickly diffuse into the filter cavity of the shell, thereby improving the filtering effect.

[0021] The beneficial effects of the present invention are as follows: by adopting the above scheme, the filter element and the first housing are squeezed and sealed against each other by the second sealing surface of the interface and the first sealing surface of the sealing boss, and at the same time, the filter element and the first housing are reliably limited and fixed by the limiting boss on the outer periphery of the first end cover and the limiting step of the first housing. Compared with the prior art, not only the spring as an auxiliary support is omitted, but also the O-ring is omitted, which not only reduces the parts and reduces the cost, but also has a simpler structure, more convenient filter element installation, and more stable and reliable sealing performance. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 This is a schematic structural diagram of a filter according to an embodiment of the present invention.

[0023] Figure 2 This is a schematic diagram of the cross-sectional structure of the filter according to an embodiment of the present utility model.

[0024] Figure 3 for Figure 2 Enlarged schematic diagram of point A in the middle.

[0025] Figure 4 for Figure 2 Enlarged schematic diagram of point B in the middle.

[0026] Figure 5 This is a structural diagram of the first shell of an embodiment of the present utility model.

[0027] Figure 6 This is a schematic structural diagram of a filter element according to an embodiment of the present invention. DETAILED DESCRIPTION

[0028] The embodiments of the present invention will be further described below with reference to the accompanying drawings.

[0029] As shown in the figure, a filter includes a shell and a filter element arranged in the shell.

[0030] The housing includes a first shell 1 and a second shell 2. The first shell 1 defines a first accommodating chamber 11 with an open lower end. A first joint is formed at the upper end of the first shell 1, and the first joint defines a first passage 12 communicating with the first accommodating chamber 11. The second shell 2 defines a second accommodating chamber 21 with an open upper end. A second joint is formed at the lower end of the second shell 2, and the second joint defines a second passage 22 communicating with the second accommodating chamber 21. The second shell 2 is fixedly connected to the first shell 1, and the first accommodating chamber 11 and the second accommodating chamber 21 together constitute a filter chamber.

[0031] The first housing 1 and the second housing 2 are both made of metal, preferably stainless steel, which has the characteristics of high strength, corrosion resistance, suitability for use in humid environments, and extended service life. Of course, the material is not limited to stainless steel, and other materials can also be selected.

[0032] As a disposable filter product, the first shell 1 and the second shell 2 are preferably connected by welding. By welding, the first shell 1 and the second shell 2 are formed into a shell structure with an integrated structure. The welding connection method is not only simple and stable in structure, low in cost, but also has good sealing performance. Of course, the first shell 1 and the second shell 2 can also be connected by other methods, such as threaded connection.

[0033] To facilitate the welding and installation of the first and second housings 1 and 2, a positioning boss 17 is formed on the end surface of the open end of the first housing 1, and a corresponding positioning recess 25 is formed on the end surface of the open end of the second housing 2. The positioning boss 17 and the positioning recess 25 cooperate to ensure concentricity between the first and second housings 1 and 2, while also greatly improving installation and welding efficiency. Alternatively, the positioning recess may be formed on the first housing, while the corresponding positioning boss is formed on the second housing.

[0034] In addition, both the first and second connectors are externally threaded, i.e., the first connector is a first threaded connector 16, and the second connector is a second threaded connector 23. Through the first and second threaded connectors 16 and 23, the filter can be quickly connected to the fluid pipeline for filtration via a threaded connection, making assembly and disassembly very convenient. The outer wall of the second housing 2 is also formed with a hexagonal operating boss 24, further facilitating threaded connection operations.

[0035] The filter element 3 includes a first end cover 31 , a second end cover 32 , a center rod 33 , and a filter membrane 34 .

[0036] The center rod 33 is hollow and has holes on its surface for fluid to pass through. The first end cover 31 and the second end cover 32 are respectively arranged at both ends of the center rod 33, wherein the first end cover 31 is formed with an interface 311 connected to the hollow interior of the center rod 33, and the second end cover 32 is usually closed. The filter membrane 34 is arranged around the center rod 33, and the two ends of the filter membrane 34 are sealed with the first end cover 31 and the second end cover 32.

[0037] The first end cap 31, the second end cap 32, and the center rod 33 can be made of plastic materials such as PP, PFA, PVDF, etc. according to actual needs. The filter membrane 34 can be made of PP, PES, PTFE, etc. according to actual needs. Its structure can be folded or wound, and no specific limitation is made here.

[0038] The filter element 3 is installed in the filter cavity of the housing. The first end cover 31 of the filter element 3 is sealed to the first housing 1 , and the interface 311 of the first end cover 31 is in communication with the first channel 12 of the first housing 1 .

[0039] A sealing boss 13 is integrally formed at the bottom center of the first accommodating chamber 11 of the first shell 1. A connecting hole 131 communicating with the first channel 12 is formed at the center of the sealing boss 13. An inclined first sealing surface 132 is formed on the outer wall of the sealing boss 13. A limiting step 14 is also formed on the inner wall of the first accommodating chamber 11.

[0040] An inner sidewall of the interface 311 of the first end cover 31 forms an inclined second sealing surface 312 , and a plurality of circumferentially distributed limiting bosses 313 are formed on the outer periphery of the first end cover 31 .

[0041] When installing the filter element 3, the first end cover 31 of the filter element 3 is pressed into the first accommodating chamber 11 from the opening of the first shell 1. Since the first end cover 31 is made of plastic, it has a certain degree of expansion and contraction performance, which enables the first end cover 31 to be smoothly pressed into the first accommodating chamber 11. After the first end cover 31 is pressed into the first accommodating chamber 11, the interface 311 of the first end cover 31 will be sleeved on the outside of the sealing boss 13 of the first shell 1 and squeezed against each other. Since the second sealing surface 312 of the interface 311 and the first sealing surface 132 of the sealing boss 13 are both arranged at an angle, the second sealing surface 312 and the first sealing surface 132 are squeezed against each other to form a wedge-shaped sealing fit, thereby forming a more reliable sealing performance. At the same time, the limiting boss 313 will cross the limiting step 14, and the limiting boss 313 can form a limiting snap-fit ​​fit with the limiting step 14, thereby firmly limiting the filter element 3, effectively avoiding the problem of the filter element 3 being offset or falling off, and the structure is more stable and reliable. Compared with the existing technology, not only the spring as auxiliary support is omitted, but also the O-ring is omitted, which not only reduces parts and reduces costs, but also has a simpler structure, more convenient filter element installation, and more stable and reliable sealing performance.

[0042] Among them, the first sealing surface 132 and the second sealing surface 312 are both conical surfaces, and the taper of the first sealing surface 132 is smaller than the taper of the second sealing surface 312. When the first sealing surface 132 contacts the second sealing surface 312, the second sealing surface can be deformed under the action of mutual compression between the first sealing surface and the second sealing surface, and the second sealing surface can be tightly attached to the first sealing surface, thereby forming a tighter seal and ensuring a reliable seal.

[0043] In addition, the sidewall of the first accommodating chamber 11 near the opening is a tapered wall 15, the end of which forms the limiting step 14. The tapered wall 15 tapers from the opening to the limiting step. This tapered wall 15 serves as a guide, facilitating the installation of the first end cap and making assembly easier and more convenient. Similarly, the outer sidewall of the limiting boss 313 can also be configured as a beveled structure to form a guide structure, further facilitating installation. Furthermore, the tapered structure of the tapered wall facilitates medium flow and reduces residual liquid.

[0044] Typically, the second channel of the housing is the inlet channel, and the first channel is the outlet channel. The flow area of ​​the outlet end of the second channel 22 gradually expands along the flow direction. During filtering, the fluid can quickly diffuse into the filter cavity of the housing, thereby improving the filtering effect.

[0045] The production and assembly process of the above filter is as follows:

[0046] During assembly, one end of the first end cover of the filter element is first pressed into the first shell, and then the first shell and the second shell are fixed together by welding. The assembly operation is very convenient.

[0047] The above filter works as follows:

[0048] Before use, the filter chamber is mounted on the fluid pipeline through the first threaded joint and the second threaded joint;

[0049] During use, the fluid enters the filter cavity through the second channel, and then enters the hollow interior of the central rod after being filtered by the filter membrane. Finally, the filtered fluid is sent out through the first channel to complete the filtration.

[0050] When the filter chamber reaches its service life, it can be replaced as a whole.

[0051] The beneficial effects of the above-mentioned filter chamber are as follows: using the above scheme, the filter element and the first shell are squeezed and sealed against each other by the second sealing surface of the interface and the first sealing surface of the sealing boss. At the same time, the filter element and the first shell are reliably limited and fixed through the limiting boss on the outer periphery of the first end cover and the limiting step of the first shell. Compared with the existing technology, not only the spring as auxiliary support is eliminated, but also the O-ring is eliminated, which not only reduces parts and reduces costs, but also has a simpler structure, more convenient filter element installation, and more stable and reliable sealing performance.

[0052] In the description of the present invention, it should be noted that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "back," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating positions or location relationships, are based on the positions or location relationships shown in the accompanying drawings and are intended solely to facilitate the description of the present invention and simplify the description. They do not indicate or imply that the devices or components referred to must have a specific orientation, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on the present invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0053] In the description of the present invention, it should be noted that, unless otherwise clearly specified or limited, the terms "installed", "connected", and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, or it can be internal communication between two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to the specific circumstances. In addition, in the description of the present invention, unless otherwise specified, "plurality" means two or more.

[0054] Technical personnel please note: Although the utility model has been described according to the above specific implementation methods, the utility model concept of the utility model is not limited to this utility model. Any modification using the utility model concept will be included in the scope of protection of this patent right.

Claims

1. A filter comprising: A first housing (1) having a first accommodating cavity (11) and a first channel (12); a second housing (2) having a second accommodating chamber (21) and a second channel (22); the second housing (2) is fixedly connected to the first housing (1); the first accommodating chamber (11) and the second accommodating chamber (21) together form a filter chamber; A filter element (3) is disposed in the filter cavity and comprises at least a first end cap (31), wherein the first end cap (31) is sealedly connected to the first housing (1) and forms an interface (311) communicating with the first channel (12) and the hollow interior of the filter element (3); The invention is characterized in that: a sealing boss (13) is formed at the center of the end of the first accommodating cavity (11), the sealing boss (13) is formed with a connecting hole (131) communicating with the first channel (12), and the outer side wall of the sealing boss (13) is formed with a first sealing surface (132) arranged obliquely; The inner side wall of the first accommodating cavity (11) forms a limiting step (14); The inner side wall of the interface (311) forms an inclined second sealing surface (312), the outer periphery of the first end cover (31) forms a limiting boss (313), the interface (311) of the first end cover (31) is sleeved outside the sealing boss (13), the second sealing surface (312) and the first sealing surface (132) are squeezed against each other to form a seal, and the first end cover (31) is limitedly engaged with the limiting step (14) of the first shell (1) through the limiting boss (313).

2. The filter according to claim 1, characterized in that The side wall of the first accommodating cavity (11) close to one end of the opening is a tapered wall (15), the end of the tapered wall (15) forms the limiting step (14), and the tapered wall (15) is tapered in a direction from the opening to the limiting step.

3. The filter according to claim 1, characterized in that The first sealing surface (132) and the second sealing surface (312) are both conical surfaces, and the taper of the first sealing surface (132) is smaller than the taper of the second sealing surface (312).

4. The filter according to claim 1, characterized in that The outer side wall of the limiting boss (313) is in a sloped structure.

5. The filter according to claim 1, characterized in that The first shell (1) and the second shell (2) are both made of stainless steel.

6. The filter according to claim 1, characterized in that The first shell (1) and the second shell (2) are welded into an integrated structure.

7. The filter according to claim 6, characterized in that A positioning recess and a positioning boss are correspondingly formed at one end where the first shell (1) and the second shell (2) are connected to each other, and the first shell (1) and the second shell (2) are positioned and matched via the positioning recess and the positioning boss.

8. The filter according to claim 1, characterized in that A first threaded joint (16) is formed at the end of the first shell (1), and a second threaded joint (23) is formed at the end of the second shell (2).

9. The filter according to claim 8, characterized in that The outer side wall of the second shell (2) is formed with at least one section of a polygonal operating boss (24).

10. The filter according to claim 1, characterized in that The flow area at the outlet end of the second channel (22) gradually expands along the flow direction.

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