Bag type filter

Abstract

The bag type filter comprises a shell and a filter element arranged in the shell, an outlet cover is arranged at one end of the shell, a liquid outlet communicated with the liquid outlet end of the filter element is formed in the outlet cover, a first groove is formed in the area, close to the filter element side and corresponding to the liquid outlet, of the outlet cover, and a second groove is formed in the area, close to the filter element side, of the outlet cover. At least part of the liquid outlet end of the filter element is contained in the first groove, and a first protrusion connected with the liquid outlet end of the filter element is arranged in the first groove. According to the utility model, the first groove and the first bulge are arranged in the outlet cover, so that the dead volume in the filter is effectively reduced, and the recovery rate of feed liquid is improved.

Description

TECHNICAL FIELD

[0001] The utility model belongs to filter filter technical field, especially relate to a capsule filter. BACKGROUND

[0002] The capsule filter is also called integrated filter, and its filter core usually adopts folded filter membrane, has large filter surface area and is suitable for filtering large volume solution. At present, the widely used capsule filter in market has a closed container, and two joints are arranged on the container respectively for liquid inlet and liquid outlet. For example, a filter disclosed in Chinese patent publication No. CN221182326U comprises a filter shell 5, the inside of the filter shell 5 is provided with a folded filter core 100 with high structural stability, the filter shell 5 is provided with a liquid inlet 5a and a liquid outlet 5b, the liquid enters the folded filter core 100 from the liquid inlet 5a and is discharged outward from the liquid outlet 5b after filtration, so that the filtration process is smoothly carried out.

[0003] In the prior art, after filtration is completed, there is always some liquid remaining in the cavity between the interface end cover of the filter core and the capsule shell. Since the height of the cavity is lower than the lowest liquid level that the filter core shell can enter, the liquid cannot be filtered, and the liquid can only be discharged from the side liquid discharge pipeline. Therefore, the space volume occupied by the liquid is also called the dead volume of the capsule filter. The dead volume is large, and the volume of the lost liquid is also large. Especially in the case of less liquid or expensive liquid, the user will suffer great economic loss. UTILITY MODEL CONTENTS

[0004] The utility model provides a kind of capsule filter, by the setting of first recess and first protrusion in outlet cover, effectively reduce the size of filter internal dead volume.

[0005] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0006] A kind of capsule filter, including shell and the filter core being set in shell, the one end of the shell is equipped with outlet cover, the outlet cover is equipped with the liquid outlet being communicated with the liquid outlet end of filter core, the area of the outlet cover near filter core side is equipped with first recess corresponding to liquid outlet, the liquid outlet end of filter core is at least partially contained in first recess, first protrusion being connected with the liquid outlet end of filter core is equipped in first recess. Since first protrusion is usually arranged on the surface of outlet cover in the prior art, the liquid outlet end of filter core is connected by welding with first protrusion, which results in that there is large dead volume between the liquid outlet end of filter core and outlet cover. However, the first recess is arranged on the side of outlet cover near filter core in the present application, and first protrusion for connection is arranged in first recess, which effectively reduces the size of dead volume and improves the recovery rate of liquid.

[0007] Preferably, the top height of the first protrusion is lower than the depth of the first groove. By limiting the height of the first protrusion, the welding area between the first protrusion and the liquid outlet end of the filter element is located inside the first groove, thereby further reducing the dead volume.

[0008] Preferably, a gap is provided between the first protrusion and the sidewall of the first groove. By providing a gap between the first protrusion and the sidewall of the first groove, the material at the connection point between the first protrusion and the liquid outlet end of the filter element is fully melted during welding, but the material in the vicinity will not be heated due to the gap. At the same time, the gap can accommodate the overflow generated by welding, which helps to ensure the connection quality.

[0009] Preferably, the filter element outlet end is provided with a filter element connecting protrusion, which connects to the first protrusion. The positions of the filter element connecting protrusion and the first protrusion correspond to each other, so as to facilitate the fit between the filter element and the outlet cap, ensuring the strength of the weld and the overall sealing of the filter.

[0010] Preferably, the outlet cover has a second protrusion that connects to the housing, and a first platform is provided on the inner side of the second protrusion. The housing protrusion and the second protrusion are positioned correspondingly to facilitate welding between the housing and the outlet cover, ensuring the strength of the weld and the overall sealing of the filter. The first platform is the end face of the outlet cover near the filter element, and it is designed to fit as closely as possible to the end of the filter element to reduce the dead volume between the filter element and the first platform.

[0011] Preferably, a second platform is provided within the first groove, with the height of the first platform exceeding the height of the second platform. After welding, a relatively large cavity exists between the filter element and the outlet cap. By using the first and second platforms in conjunction, this cavity can be further filled, resulting in less unfiltered liquid entering the cavity and a higher recovery rate. Furthermore, the second platform creates a stepped sidewall in the first groove, allowing for the adaptation of more filter element types compared to a single platform, thus expanding the applicability of the outlet cap.

[0012] Preferably, the outlet cover has a reflux port communicating with the interior of the housing, and the first platform and / or the second platform has a second groove corresponding to the reflux port, with the reflux port communicating with the second groove. The second groove enables direct communication between the space on the first platform and / or the second platform and the outside. After filtration, any small amount of liquid remaining on the first platform and / or the second platform that cannot be discharged can be easily discharged through the reflux port.

[0013] Preferably, the second groove is connected to the first groove. The connection between the second groove and the first groove allows the space inside the first groove, i.e. the space outside the first protrusion, to be directly connected to the outside. After filtration, a small amount of liquid remaining on the outside of the first protrusion that cannot be discharged can be easily discharged through the return port.

[0014] Preferably, the outlet cover and the filter element, as well as the outlet cover and the housing, are fixed by fusion welding.

[0015] Preferably, the outlet cover has a third protrusion between the second protrusion and the filter element, and the outer shell of the filter element has several through holes. The upper surface of the third protrusion does not exceed the bottom edge of the through hole closest to the outlet cover. By matching the third protrusion with the position closest to the through hole of the outlet cover, the dead volume between the filter element and the outlet cover is further reduced while ensuring filtration efficiency.

[0016] The beneficial effects of this utility model are: (1) It effectively reduces the dead volume between the liquid outlet end of the filter element and the outlet cover, reduces liquid loss, and thus reduces economic losses; (2) It prevents the material in the vicinity from being heated during the welding process, and has space to accommodate the overflow generated by welding, which is conducive to ensuring the connection quality; (3) By setting the first platform and the second platform to fill the above-mentioned cavity, a large cavity will exist between the filter element and the outlet cover, reducing the size of the dead volume; (4) By setting the first platform and the second platform, compared with a single platform, it can adapt to more types of filter elements, improve the application range of the outlet cover, and reduce production costs; (5) By setting the third protrusion, the dead volume is further reduced and will not affect the filtration efficiency. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of a structure according to Embodiment 1 of this utility model;

[0018] Figure 2 This is a cross-sectional view of the outlet cover of Embodiment 1 of this utility model;

[0019] Figure 3 This is a schematic diagram of the structure of the outlet cover in Embodiment 1 of this utility model;

[0020] Figure 4 This is a schematic diagram of a structure of Embodiment 2 of this utility model;

[0021] Figure 5 This is a schematic diagram of the structure of the outlet cover in Embodiment 2 of this utility model.

[0022] In the diagram: 1. Inlet cap, 11. Housing, 2. Housing protrusion, 21. Outlet cap, 3. Second protrusion, 31. First platform, 32. Second platform, 33. First protrusion, 34. Outlet, 35. Return port, 36. Second groove, 36a. First groove, 37. Gap, 38. Third protrusion, 39. Filter element, 4. Through hole, 41. Through hole closest to the outlet cap, 41a. Housing, 42. Filter element outlet end, 43. Filter element connection protrusion, 43a. Detailed Implementation

[0023] The present invention will be further described below with reference to the accompanying drawings and specific embodiments.

[0024] Example 1

[0025] like Figure 1 In the illustrated embodiment, a capsule filter includes a housing 2 and a filter element 4. The upper end of the housing 2 is provided with an inlet cap 1, which has a liquid inlet 11. The lower end of the housing 2 is provided with an outlet cap 3, which has a liquid outlet 35. The filter element 4 is disposed inside the housing 2 and contains a pleated filter membrane (a conventional structure, not shown in the figure), which has a large filtration surface area and is suitable for filtering large volumes of solutions. The outer shell 42 of the filter element 4 has several through holes 41 to facilitate the entry of the liquid into the filter element 4. The lower end of the filter element 4 is the liquid outlet end 43. The outlet cap 3 has an outlet 35 communicating with the liquid outlet end 43 of the filter element, so that the filtrate formed after the liquid is filtered inside the filter element 4 can be discharged from the filter element 4.

[0026] like Figure 2 , Figure 3 As shown, the outlet cover 3 has a first groove 37 in the area corresponding to the liquid outlet 35 near the filter element 4. The first groove 37 contains a first protrusion 34 for connecting the liquid outlet end 43 of the filter element. The first protrusion 34 has an annular structure and is arranged around the liquid outlet 35. Combined with... Figure 1 As shown, the filter element outlet end 43 is provided with a filter element connecting protrusion 43a. The filter element connecting protrusion 43a is fixed to the first protrusion 34 by fusion welding. At least part of the filter element outlet end 43 is accommodated in the first groove 37. The fit between the filter element outlet end 43 and the outlet cover 3 is also tighter, which greatly reduces the dead volume between the end of the filter element 4 and the cover.

[0027] like Figure 1 , Figure 2 As shown, the top height of the first protrusion 34 is lower than the depth of the first groove 37, combined with Figure 3 As shown, the top of the first protrusion 34 is annular. Since the top of the first protrusion 34 is welded to the filter element connecting protrusion 43a of the filter element outlet end 43, the height of the first protrusion 34 is relatively lower than the depth of the first groove 37, so that the welding area of ​​the first protrusion 34 and the filter element connecting protrusion 43a is located inside the first groove 37, thereby further reducing the dead volume.

[0028] like Figure 2 , Figure 3 As shown, a gap 38 is provided between the first protrusion 34 and the sidewall of the first groove 37, for combination Figure 1 As shown, when the first protrusion 34 and the filter element connecting protrusion 43a of the filter element outlet end 43 are welded, the material at the connection part of the two is fully melted by heat. However, due to the existence of the gap 38, the material in the vicinity will not be heated. At the same time, the overflow generated when the material at the connection part melts can flow into the gap 38 and will not overflow further, which helps to ensure the welding quality.

[0029] like Figure 1 , Figure 2 As shown, the outer periphery of the housing 2 is provided with a housing protrusion 21, and the outlet cover 3 is provided with a second protrusion 31. The second protrusion 31 and the housing protrusion 21 are also fixed by fusion welding. The inner side of the second protrusion 31 is provided with a first platform 32, and the first groove is provided with a second platform 33. The height of the first platform 32 is higher than the height of the second platform 33. The top of the first protrusion 34 and the top of the second protrusion 31 are provided as welding positions for welding with the corresponding filter element 4 and the housing 2. During the contact between the welding line and the heater, the material at this position is fully melted. The height of the second platform 33 and the first platform 32 is staggered with the corresponding first protrusion 34 and the second protrusion 31, which can effectively prevent the material in the vicinity from being heated and ensure welding accuracy. After welding, the setting of the second platform 33 and the first platform 32 will largely fill the dead volume cavity between the filter element 4 and the outlet cover 3, thereby ensuring the recovery rate of the liquid. In addition, by setting the second platform 33 and the first platform 32, more types of filter elements 4 can be accommodated compared with a single platform, increasing the application range of the outlet cover 3 and helping to reduce production costs.

[0030] like Figure 1 , Figure 2 As shown, the outlet cover 3 is provided with a return port 36 communicating with the interior of the housing 2. The second platform 33 is provided with a second groove 36a corresponding to the return port 36, and the return port 36 is connected to the second groove 36a. When the liquid enters the housing 2 from the inlet 11 of the inlet cover 1, the liquid enters the interior of the filter element 4 through the through hole provided on the outer shell of the filter element 4 for filtration. After filtration, the liquid flows to the outlet cover 3 through the outlet end 43 of the filter element and is discharged outward through the outlet port of the outlet cover 3. The second groove 36a is also connected to the first groove 37. The setting of the second groove 36a enables the space on the second platform 33 and the space outside the first protrusion 34 to be directly connected to the outside. After filtration, a small amount of liquid on the second platform 33 and the outside of the first protrusion 34 cannot be discharged, and this part of the liquid can be discharged by opening the return port 36.

[0031] Example 2

[0032] The difference between this embodiment and Embodiment 1 is that, as Figure 4 , Figure 5 As shown, the outlet cover 3 has a third protrusion 39 between the second protrusion 31 and the filter element 4. The outer shell 42 of the filter element 4 has several through holes 41. The upper surface of the third protrusion 39 is flush with the bottom edge of the through hole 41a closest to the outlet cover. The area formed between the bottom edge of the through hole 41a closest to the outlet cover and the outlet cover 3 is a dead volume of the bladder filter where liquid cannot be filtered. The third protrusion 39 can effectively fill the dead volume in this area, thereby further reducing the size of the dead volume.

[0033] The embodiments of this utility model have been described in detail above. Specific examples have been used to illustrate the principles and implementation methods of this utility model. The description of the above embodiments is only for the purpose of helping to understand the method and core ideas of this utility model. At the same time, for those skilled in the art, there will be changes in the specific implementation methods and application scope based on the ideas of this utility model. Therefore, the content of this specification should not be construed as a limitation of this utility model.

Claims

1. A capsule filter comprising a housing (2) and a filter element (4) arranged in the housing (2), one end of the housing (2) being provided with an outlet cover (3), the outlet cover (3) being provided with an outlet port (35) in communication with the outlet end (43) of the filter element, characterized in that, The outlet cover (3) is provided with a first groove (37) corresponding to the area of the liquid outlet (35) near the filter core (4) side, the filter core liquid outlet end (43) is at least partially accommodated in the first groove (37), and the first groove (37) is provided with a first protrusion (34) connected with the filter core liquid outlet end (43).

2. A bladder filter according to claim 1, wherein, The top height of the first protrusion (34) is lower than the depth of the first groove (37).

3. A capsule filter according to claim 1, characterized in that A gap (38) is provided between the first protrusion (34) and the side wall of the first groove (37).

4. A bladder filter according to claim 1, wherein, The filter core liquid outlet end (43) is provided with a filter core connecting protrusion (43a), and the filter core connecting protrusion (43a) is connected with the first protrusion (34).

5. A bladder filter according to claim 1, wherein, The outlet cover (3) is provided with a second protrusion (31) connected with the shell (2), and the inner side of the second protrusion (31) is provided with a first platform (32).

6. A bladder filter according to claim 5, wherein, The first groove (37) is provided with a second platform (33), and the height of the first platform (32) is higher than the height of the second platform (33).

7. A bladder filter according to claim 5, wherein, The outlet cover (3) is provided with a backflow port (36) in communication with the inside of the shell (2), the first platform (32) and / or the second platform (33) is provided with a second groove (36a) corresponding to the position of the backflow port (36), and the backflow port (36) is in communication with the second groove (36a).

8. A bladder filter according to claim 7, wherein, The second groove (36a) is in communication with the first groove (37).

9. A bladder filter according to claim 1 wherein, The outlet cover (3) and the filter core (4) are fixed by fusion welding, and the outlet cover (3) and the shell (2) are fixed by fusion welding.

10. A bladder filter according to claim 5, wherein, The outlet cover (3) is provided with a third protrusion (39) between the second protrusion (31) and the filter core (4), the shell (42) of the filter core (4) is provided with a plurality of through holes (41), and the upper surface of the third protrusion (39) does not exceed the bottom edge closest to the outlet cover through hole (41a).

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