CN220779325U - Front filter - Google Patents

Abstract

The utility model relates to a pre-filter, which comprises a shell, a support piece and a filtering component, wherein the shell is provided with a first communication port and a second communication port, and a first flow passage communicated with the first communication port is formed in the support piece; the outer side surface of the support piece and the inner wall of the shell are arranged at intervals to form a second flow passage; the second end of the supporting piece and the second communication port are arranged at intervals to form a third flow passage; the filter element includes a first portion overlying the side of the support member and a second portion overlying the second end of the support member, the first portion being located on the first and second flow paths, the second portion being located on the first and third flow paths. The present utility model increases the second portion of the filter element at the second end of the support, increases the filter area of the filter element, and filters fluid from one of the flow paths even if the other flow path is blocked while the fluid passes through the filter element, and provides a greater overall filtered flow rate for the entire filter.

Description

Front filter

Technical Field

The utility model relates to the technical field of filtration, in particular to a pre-filter.

Background

When the pump body works, in order to avoid larger impurities in the liquid, the pump body is damaged due to the fact that the impurities enter the pump body, so that a pump body front filter is arranged at the front end of the pump body and used for filtering fluid input into the pump body.

As shown in fig. 1, chinese patent No. CN207614479U discloses a prefilter, which comprises an outer casing 10, a framework 20 and a filter screen 30, wherein the same end of the outer casing is provided with a water inlet 101 and a water outlet 102. The framework comprises a frame body 21 with a water passing channel and a water outlet head connected with the frame body. The filter screen 30 is sleeved outside the frame 21. The water outlet head is communicated with the water outlet 102. The filter screen 30 is spaced from the outer casing 10, the water inlet 101 is communicated with the space, the filter screen on the side surface of the frame 21 is used for filtering water, and the filtered water flows out from the water outlet through the inside of the frame and the water outlet head.

In this patent, the support body plays the supporting role to the filter screen, but the support body will shelter from filter screen itself, lost the filtration area of some filter screens, it is less to lead to filtration area, the whole flow of filter is less, and in this patent, water flows into the support body from the interval, impurity is filtered and is attached to one side at the filter screen orientation interval, along with the filter uses for a long time, impurity increases gradually, occupy spaced space, and the interval between filter screen and the shell body is less, impurity is piled up in the interval and is easily stopped up the runner, make the whole filtration resistance of leading filter grow, it is obvious to the hydraulic pressure influence, the filter flow further reduces.

Therefore, it is necessary to design a pre-filter, which can solve the problems of small filtering area and small flow of the existing pre-filter.

Disclosure of Invention

Aiming at the defects existing in the prior art, the utility model aims to provide a pre-filter, which solves the problem of small flow of the prior pre-filter.

In order to achieve the above purpose, the present utility model adopts the following technical scheme:

a pre-filter, comprising:

the shell is provided with a first end plate, a second end plate and a cylinder body, wherein the cylinder body is connected with the first end plate and the second end plate in a sealing way, a first communication port is formed in the first end plate, and a second communication port is formed in the second end plate;

a support for supporting the filter element, having a first end and a second end at both axial ends, the first end being sealingly connected to the housing; wherein,

a first flow passage communicated with the first communication port is formed in the support piece;

the outer side surface of the support piece and the inner wall of the shell are arranged at intervals to form a second flow passage;

the second end of the supporting piece and the second communication port are arranged at intervals to form a third flow passage;

a filter member located inside the housing;

the filter element includes a first portion overlying a side of the support member and a second portion overlying a second end of the support member, the first portion being located on the first flow channel and the second flow channel flow path, the second portion being located on the first flow channel and the third flow channel flow path.

In the pre-filter of the utility model, fluid can flow between the first flow passage and the second flow passage and be filtered by the first part of the filter component, and fluid can also flow between the first flow passage and the third flow passage and be filtered by the second part of the filter component, so that the whole filter has larger filtering area and larger filtering flow; and based on different support structures and the arrangement modes of the support structures in the shell, the distribution positions of the second flow channel and the third flow channel are different, when fluid passes through the filtering component, the fluid can pass through the first part or the second part according to the resistance of different paths, and even if one flow path is blocked, the fluid can be filtered from the other flow path.

Specifically, when the first communication port is an inlet, and the second communication port is an outlet, the liquid filtering process is as follows: the liquid enters the support from the first communication port, is positioned in the first flow channel, then passes through the second part positioned on the flow paths of the first flow channel and the third flow channel, enters the third flow channel, or passes through the first part positioned on the flow paths of the first flow channel and the second flow channel, enters the second flow channel, and filtrate entering the third flow channel and the second flow channel flows out from the second communication port. The whole in-process filter component can ensure small resistance and large filtering area when filtering.

When the second communication port is an inlet and the first communication port is an outlet, the liquid filtering process is as follows: the liquid enters the shell from the second communication port, the third flow passage is directly communicated with the second communication port, or the liquid passes through the first part of the filter element through the second flow passage and enters the first flow passage in the support piece, filtrate is collected to the first flow passage and flows out from the first communication port, and the filter element can ensure smaller resistance and larger filter area in the whole process.

Compared with the prior art, the liquid filtering device only depends on the filtering membrane at the side surface of the supporting piece to filter liquid, the second part of the filtering component at the second end of the supporting piece is added, the filtering area of the filtering component is increased, and the filter can have larger flow.

Preferably, the filter component is sleeved on the periphery of the support piece; wherein the second end of the supporting piece is provided with a plurality of through holes; or the second end of the supporting piece is provided with an opening.

The filter component is sleeved on the periphery of the support piece, the area of the filter component is larger than or equal to the outer surface area of the support piece, the filter area of the filter component is larger, the filter component can be arranged on the periphery of the support piece in a stretching manner, and the support effect of the support piece on the filter component is better; the second part of the filter element is located between the first flow channel and the third flow channel, so that the second part of the filter element is located at the second end of the support element, and therefore, a plurality of through holes or through grooves are formed in the second end of the support element, or the second end of the support element is directly arranged as an opening, the blocking of the second part of the filter element by the support element is reduced, the filtering area of the second part of the filter element is fully utilized, and when liquid flows through the second part of the filter element, the flowing resistance is smaller.

Preferably, the filter element covers the inner periphery of the support, and the second end of the support is provided with a plurality of through holes or through grooves.

The filter component is covered on the inner periphery of the support, and can be firmly connected with the support in a sealing way; the second part of the filter element is positioned between the first flow channel and the third flow channel, so that the second part of the filter element is positioned at the second end of the supporting piece, the second end of the supporting piece can be used for passing liquid, the structure of the second end of the supporting piece is various, a plurality of through holes or through grooves are formed at the second end of the supporting piece, and the supporting effect on the second part of the filter element is better compared with the second end which is of an opening structure.

Preferably, the first portion and the second portion of the filter element are of an integral structure, so that the filter element forms a pocket-shaped structure, the filter element is conveniently sleeved on the outer periphery of the support element, or is covered on the inner periphery of the support element, no additional connection exists between the first portion and the second portion of the filter element, namely no gap exists between the first portion and the second portion, unfiltered liquid is prevented from leaking out of the gap, and the unfiltered liquid is mixed with filtrate, so that the filtering effect is affected.

Preferably, the support is sleeved with a fixing ring, and cooperates with the support to form a clamp for the filter element so as to fix the filter element on the support.

When the filter component is sleeved on the periphery of the support piece to form a similar cylindrical structure, the fixing ring is sleeved on the outer sides of the support piece and the filter membrane, and the fixing piece and the support piece are matched to clamp the filter component so as to fix the filter component on the side wall of the support piece by the fixing ring; the fixing ring used in the utility model can be one, the filter component is of an integral structure, a pocket-shaped structure is formed, the fixing ring is close to the first end of the supporting piece, so that the first part of the filter component is tightly stretched on the surface of the outer side wall of the supporting piece, and the second part of the filter component is tightly stretched on the outer surface of the second end of the supporting piece; the two fixing rings used in the utility model can be two, one is close to the first end of the supporting piece, the other is close to the second end of the supporting piece, the two fixing rings are respectively used for fixing the two axial ends of the first part of the filtering component, the fixing ring close to the second end of the supporting piece is used for fixing the second part of the filtering component on the periphery of the second end of the supporting piece and covering the second end of the supporting piece, and at the moment, the first part and the second part of the filtering component can be of an integral structure or a split structure; the fixing rings used in the utility model can be three or more, the spacing sleeve is arranged on the periphery of the supporting piece, and the spacing sleeve is matched with the supporting piece to clamp the filtering component so as to fix the filtering component on the supporting piece, so that the installation is firmer, and the sealing effect between the filtering component and the supporting piece is better.

Preferably, a welding step surface is arranged in the shell, and the end surface of the supporting piece and the fixing ring are opposite to the welding step surface and welded.

In order to realize sealing connection of the first end of the support piece and the shell, the end face of the first end of the support piece is opposite to the welding step face inside the shell and welded, and meanwhile, the fixing ring is opposite to the welding step face, so that the fixing ring and the support piece can be welded to the welding step face at the same time, secondary welding is avoided, the fixing ring and the support piece are firmer in relative fixing relation, the clamping effect on the filter element is better, the filter element is prevented from falling off from the support piece, liquid inside and outside the support piece is not in direct contact with the filter element, and unfiltered liquid is led to be directly mixed with filtrate.

Preferably, a plurality of abutting pieces are arranged in the shell, and the abutting pieces are located between the second communication port and the second end of the supporting piece and abut against the outer surface of the second portion.

The second part of the filter element is positioned at the second end of the support element and is close to the second communication port, so that the received impact force is large, the abutting element is arranged to fix the second part of the filter element in a multi-point manner, the axial moving distance and the axial deformation degree of the second part are limited, the second part is prevented from being impacted by the liquid to be separated from the second end of the support element, the second part is prevented from being deformed too much to cause damage, unfiltered liquid is directly mixed with filtrate, and after the abutting element is arranged, the filter element can bear more impacts during filtration without affecting the filtration effect.

Preferably, the axes of the first communication port, the second communication port and the supporting piece are coaxial, the supporting piece is axially arranged in the shell, the shortest flow path formed between the first communication port and the second communication port is a first flow path, a second part of the filtering component and a third flow path, the flow resistance of liquid in the straight flow path is minimum, and the liquid is guided to be filtered in the second part of the filtering component preferentially; the inner wall of the second shell is provided with at least three supporting bars which are abutted with the outer surface of the first part, and the supporting bars which are arranged concentrically and have the same size are utilized, so that the supporting piece and the shell have higher concentricity, and the axes of the first communication port, the second communication port and the supporting piece are further promoted to be coaxial.

Preferably, the support bar and the abutting piece are of an integrated structure, and the support bar and the abutting piece are flush with the side wall of the shell in the circumferential direction.

The support bar is positioned in the second flow channel, the abutting piece is positioned in the third flow channel, the second flow channel is communicated with the third flow channel, unfiltered liquid or filtrate can flow from the second flow channel to the third flow channel or from the third flow channel to the second flow channel, the support bar and the abutting piece can generate obstruction to the fluid, if the support bar and the abutting piece are arranged in a split dislocation mode, a gap is formed between the second flow channel and the third flow channel, and the resistance to the fluid is larger, therefore, the support bar and the abutting piece are of an integrated structure so as to reduce the gap between the support body and the abutting piece, and the side walls of the support bar and the abutting piece in the circumferential direction of the shell are level, have no convex surface or concave surface, and reduce fluctuation when the fluid flows through the side walls; the supporting bar and the abutting piece with the structure can effectively reduce the resistance of liquid flowing through the supporting bar and the abutting piece.

Preferably, the side wall of the support has a plurality of holes, the walls of which are inclined towards the inner surface of the first portion.

The first runner and the second runner can be communicated through a plurality of holes in the side wall of the support piece, when the filter component is sleeved on the periphery of the support piece, and liquid flows to the second runner from the first runner, impurities can be attached to the inner surface of the first part, the hole walls of the holes incline to the inner surface of the first part so as to guide the flow direction of the liquid, the liquid can be guided to the inner surface of the first part and the impurities on the inner surface are flushed by the liquid, and therefore the blockage of the impurities to the first part is further delayed.

In summary, compared with the prior art, the utility model has at least the following beneficial effects:

1. compared with the prior art that the liquid is filtered only by virtue of the filtering membrane on the side surface of the supporting piece, the second part of the filtering component positioned at the second end of the supporting piece is added, the filtering area of the filtering component is increased, fluid can flow between the first flow channel and the second flow channel and be filtered by the first part of the filtering component, fluid can also flow between the first flow channel and the third flow channel and be filtered by the second part of the filtering component, and the overall filtering flow rate is larger for the whole filter;

2. the utility model also utilizes the outer side wall and the second end of the supporting piece to respectively form a second flow channel and a third flow channel with different distribution positions, when the fluid passes through the filtering component, the fluid can pass through the first part or the second part according to the resistance of different paths, and even if one of the flow paths is blocked, the fluid can be filtered from the other flow path;

3. since the second end of the support and the second portion of the filter element are closer to the second communication port, the flow path of the third flow passage thus formed is shorter, and the flow resistance is smaller than that of the filter in the prior art.

Drawings

In order to more clearly illustrate the embodiments of the present utility model or the technical solutions in the prior art, the drawings that are needed in the description of the embodiments or the prior art will be briefly described, and it is obvious that the drawings in the description below are some embodiments of the present utility model, and other drawings can be obtained according to the drawings without inventive effort for a person skilled in the art.

Fig. 1 is a cross-sectional view of a prior art prefilter.

Fig. 2 is a schematic structural view of a prefilter according to an embodiment of the present utility model.

Fig. 3 is a cross-sectional view at A-A in fig. 2.

Fig. 4 is another angular view of the cross-sectional view of fig. 3.

Fig. 5 is a cross-sectional view at B-B in fig. 2.

Fig. 6 is a view of another view of the cross-sectional view of fig. 5.

Fig. 7 is a cross-sectional view at C-C in fig. 2.

Fig. 8 is a view of another view of the cross-sectional view of fig. 7.

Description of the reference numerals

1. A housing; 11. a first end plate; 111. welding the step surface; 12. a cylinder; 13. a second end plate; 14. a first communication port; 15. a second communication port; 16. an abutment; 161. an abutment surface; 17. a support bar; 171. a guide slope;

2. a filter member; 21. a first section; 22. a second section;

3. a support; 31. a first end; 32. a second end; 33. a sidewall; 331. a hole; 332. a hole wall; 34. a first flow passage; 35. a second flow passage; 36. a third flow passage;

4. a fixing ring; 41. a gap.

Detailed Description

The following description of the embodiments of the present utility model will be made apparent and fully in view of the accompanying drawings, in which some, but not all embodiments of the utility model are shown. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.

In the description of the present utility model, it should be noted that the directions or positional relationships indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. are based on the directions or positional relationships shown in the drawings, are merely for convenience of describing the present utility model and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present utility model. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

In the description of the present utility model, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present utility model will be understood in specific cases by those of ordinary skill in the art.

The prefilter of the embodiment of the utility model comprises a shell 1, wherein the shell 1 is provided with a first end plate 11, a second end plate 13 and a cylinder 12, the cylinder 12 is connected with the first end plate 11 and the second end plate 13 in a sealing way, so that a cavity in the shell 1 is formed, the first end plate 11 is provided with a first communication port 14, the second end plate 13 is provided with a second communication port 15, and the first communication port 14 and the second communication port 15 are communicated with the cavity. The first communication port 14 may be an inlet, and the second communication port 15 may be an outlet, or the first communication port 14 may be an outlet, and the second communication port 15 may be an inlet.

In the embodiment shown in fig. 2 and fig. 3, the first end plate 11 and the cylinder 12 are in a split structure, and are in sealing connection by adopting a welding mode or the like, and the cylinder 12 and the second end plate 13 are in an integrated structure.

In other embodiments, the first end plate and the second end plate are both in a split structure with the cylinder body, and are in sealing connection in a welding mode and the like; or the first end plate and the cylinder body are of an integrated structure, the second end plate and the cylinder body are of a split structure, and are in sealing connection in a welding mode and the like; or the cylinder body comprises a first cylinder body and a second cylinder body which are separated, the first cylinder body and the first end plate are of an integrated structure, the second cylinder body and the second end plate are of an integrated structure, and then the first cylinder body and the second cylinder body are in sealing connection in a welding mode.

It should be noted that the first end plate 11 and the second end plate 13 are not necessarily in a flat plate structure, but may be in a disc structure, a cover structure, or the like, and can form a relatively closed chamber with the cylinder 12.

The filter element 2 and the support 3 are located inside the housing 1 in a chamber, the support 3 being adapted to support the filter element 2 so that it is properly stretched, the filter area of the filter element 2 being fully utilized. The support 3 has a first end 31 and a second end 32 at two axial ends, and a first flow channel 34 inside the support 3, and for communicating the first flow channel with the third flow channel, the second end of the support must be capable of passing liquid, and there are various specific structures, such as a mesh structure, an open structure or a structure with through holes at the second end of the support; in order to communicate the first flow channel and the second flow channel, the side wall of the supporting member can be used for passing through liquid, and various specific structures are available, such as a fence structure, a hollowed-out frame structure or a structure with through holes.

The first end 31 of the support member 3 is in sealing connection with the housing 1, the support member 3 is communicated with the first communication port 14 through the first end 31 to realize the internal first flow channel 34, the first end 31 is in sealing connection with the inner surface of the housing 1 around the first communication port 14, the second end 32 is positioned at a position, axially far away from the first end 31, of the support member 3, therefore, the second end 32 is arranged in a direction away from the first communication port 14, and the second end 32 of the support member 3 and the second communication port 15 are arranged at intervals to form a third flow channel 36, so that the second end 32 of the support member 3 is relatively close to the second communication port 15; meanwhile, the outer side surface of the support member 3 and the inner wall of the housing 1 are spaced to form a second flow passage 35, it is known that the second flow passage 35 is disposed around the outer side surface of the support member 3 and located in the circumferential direction of the support member 3, and the third flow passage 36 is located between the second end 32 of the support member 3 and the second communication port 15, that is, at least part of the third flow passage 36 is located in the axial direction of the support member 3; fluid may flow between the first and second flow passages 34, 35 and be filtered by the first portion 21 of the filter element 2, and fluid may also flow between the first and third flow passages 34, 36 and be filtered by the second portion 22 of the filter element, with a greater filtration area and filtration flow rate for the entire filter.

Meanwhile, the second flow passage 35 and the third flow passage 36 are arranged at different positions, the flow paths of the liquid in the first communication port 14 and the second communication port 15 are selected in various ways, the flow resistances of the different flow paths are different, the two flow paths are not blocked at the same time, and when one flow passage is blocked, the fluid can be filtered through the other flow passage, so that the whole filtering area of the filter is ensured to be larger, the filtering flow is larger, and the filtering resistance is smaller.

Taking the embodiment of fig. 2 and 3 as an example, in this embodiment, the support 3 is axially disposed in the housing 1, the axis of the support 3 is substantially parallel to the axis of the cylinder 12, the first end 31 is in communication with the first communication port 14, and the first end 31 is in sealing connection with the inner wall of the housing 1, the second end 32 extends toward the second communication port 15 and is disposed at a distance from the second communication port 15, the first flow channel 34 is disposed inside the support 3, the second flow channel 35 is disposed at the periphery of the side wall 33 of the support 3, the third flow channel 36 is disposed between the second end 32 and the second communication port 15 of the support 3, the filter member 2 supported by the support 3 has a first portion 21 disposed on the flow path of the first flow channel 34 and the second flow channel 35, and a second portion 22 disposed on the flow path of the first flow channel 34 and the third flow channel 36, that is corresponding to the first portion 21 of the filter member 2 and the side wall 33 of the support 3, the second portion 22 of the filter member 2 and the second end 32 of the support 3 are disposed at a distance, and the second flow channel 35 is separated from the second flow path of the second flow channel 22 and the second flow channel 35 and the second flow channel is not affected by the second flow channel 22.

The second portion 22 of the filter element 2 is located on the line connecting the first communication port 14 and the second communication port 15, the flow path of the liquid is short, and the liquid flow rate through the second portion 22 is high due to the direct impact of the liquid, so that the liquid will preferentially pass through the second portion 22; at the same time, part of the liquid will be filtered through the first portion 21. Taking the first communication port 14 as an inlet and the second communication port 15 as an outlet as an example, the liquid filtering process is as follows: liquid enters the support 3 from the first communication port 14, is located in the first flow channel 34, then preferentially passes through the second portion 22 located in the flow path of the first flow channel 34 and the third flow channel 36, enters the third flow channel 36, and of course, part of the liquid passes through the first portion 21 located in the flow path of the first flow channel 34 and the second flow channel 35, enters the second flow channel 35, the second flow channel 35 is communicated with the third flow channel 36, and both parts of filtrate flow out from the second communication port 15; along with the increase of the impurities attached to the second portion 22, the resistance of the liquid passing through the second portion 22 increases, at this time, the impurities on the first portion 21 are less, the flow resistance of the liquid passing through the first portion 21 gradually increases, and the overall resistance of the filter element 2 is larger than the initial resistance, so that the filter element meets the use requirement, has better filtering efficiency and effect, and prolongs the service life of the filter element 2.

In the embodiment shown in fig. 3 to 8, the filter element 2 is sleeved on the outer periphery of the support member 3, the first portion 21 is attached to the outer surface of the side wall 33 of the support member 3, the second portion 22 is attached to the outer periphery of the second end 32 of the support member 3, the support member 3 is in a tubular structure with two ends penetrating, the tubular side wall 33 is provided with a plurality of holes 331 communicating the first flow channel 34 and the second flow channel 35, the first end 31 and the second end 32 of the support member 3 are both in an open structure, therefore, the side wall 33 forming the opening at the first end 31 of the support member 3 is arranged around the outer periphery of the first communication port 14, the second portion 22 of the filter element 2 covers the second end 32 of the support member 3, that is, the area of the second portion 22 is larger than or equal to the area of the second end 32 of the support member 3, so that the first flow channel 34 and the third flow channel 36 can only realize liquid flow through the second portion 22, but not directly communicate through the opening at the second end 32 of the support member 3. The through structure of the two ends of the supporting piece 3 maximizes the flow area of the first end 31 and the second end 32 of the supporting piece 3, and prevents the two ends of the supporting piece 3 from obstructing the flow of the liquid.

Of course, in other embodiments, the filter element is sleeved on the outer periphery of the support element, the second end of the support element is provided with a plurality of through holes or through grooves so as to be communicated with the first flow channel and the second flow channel, although the flow area of the second end of the support element is smaller, the support effect of the second end of the support element on the second portion of the filter element is better, when the second communication port is used as a liquid inlet, liquid is flushed into the support element from the second communication port, and the deformation of the second portion is limited by the outer surface of the second end of the support element, so that the support element has higher impact resistance, can cope with the impact of liquid with higher flow rate, and avoids the damage of the second portion caused by the impact of the liquid, thereby affecting the filtering effect.

In other embodiments, the filter element covers the inner circumference of the support, and the filter element can be more firmly connected with the support in a sealing manner; the second end of the supporting piece is provided with a plurality of through holes or through grooves which are communicated with the first flow passage and the second flow passage, and the supporting effect on the second part of the filtering component is better compared with the supporting effect of the second end which is of an opening structure.

As shown in fig. 3, when the filter element 2 is sleeved on the outer periphery of the support 3 and the liquid flows from the first flow channel 34 to the second flow channel 35, impurities adhere to the inner surface of the first portion 21, the hole wall 332 of the hole 331 is inclined to the inner surface of the first portion 21 so as to guide the flowing direction of the liquid, and the liquid can be guided to the inner surface of the first portion 21 and wash the impurities on the inner surface with the liquid, so that the blockage of the first portion 21 by the impurities is further delayed.

As a preferred embodiment, as shown in the example of fig. 4, the first portion 21 and the second portion 22 of the filter element 2 are in an integral structure, the filter element 2 is a filtering membrane, the first portion 21 and the second portion 22 thereof together form a pocket-shaped structure, the filter element 2 is sleeved on the outer periphery of the support 3, and when the filter element is mounted, the filter element 2 can be sleeved on the outer periphery of the support 3 only by sleeving the open end of the filter element 2 from the second end 32 of the support 3 and extending towards the first end 31, thereby enabling the filter element 2 to cover the side surface of the support 3 and the end surface of the second end 32; and there is no gap between the first portion 21 and the second portion 22 of the filter element 2, so as to prevent unfiltered liquid from leaking from the gap and mixing with filtrate, thereby affecting the filtering effect.

The filtering component 2 in this embodiment is a screen or a filter membrane, and the filtering component 2 is preferably made of flexible materials, so that the filtering component can be directly wrapped on the outer side of the supporting piece 3 during installation, and a structure similar to the supporting piece 3 is formed. For example, when the structure of the supporting member 3 is a cylindrical structure, as shown in fig. 4, after the filtering membrane is sleeved on the supporting member 3, a structure similar to the cylinder 12 is formed; in other embodiments, when the support 3 is in a truncated cone structure, the filtering membrane forms a truncated cone-like structure.

In a specific embodiment, the arrangement of the filter element 2 may be: firstly cutting into quadrilateral membrane, then folding, heating and sealing two side edges, filtering membrane into bag structure, and then sleeving on supporting piece. Of course, the filtering membrane can also be in a cylindrical structure, one side of the filtering membrane is encapsulated to form a second part, and then the second part is directly sleeved on the supporting piece.

The filtering component 2 may be a single filtering membrane structure, or may be a plurality of filtering membranes, for example, a filtering membrane group formed by stacking two filtering membranes or three filtering membranes.

Preferably, the material of the filtering component 2 may be PFA or PTFE, so as to achieve better corrosion resistance of the filtering component 2 during filtering, so as to achieve filtering of the corrosion-resistant liquid.

More preferably, the filter component 2, the supporting piece 3, the first end plate 11, the second end plate 13 and the cylinder 12 are made of the same material, so that the welding processes of the components are similar, the welding effect is the same, the assembly process is slowed down, and the assembly quality is improved.

As shown in fig. 3 and fig. 4, the support 3 is sleeved with a fixing ring 4, the fixing ring 4 is close to the first end 31 of the support 3 and cooperates with the support 3 to clamp the filter element 2, and since the filter element 2 is in a pocket structure, the opening of the filter element is located at one side of the first portion 21 away from the second portion 22, the first portion 21 of the filter element 2 is fixed on the periphery of the first end 31 of the support 3 by the fixing ring 4, and the first portion 21 completely covers all the holes 331 on the side wall 33 of the support 3, so that the separation of the first flow channel 34 and the second flow channel 35 can be realized, and the liquid can flow between the first flow channel 34 and the second flow channel 35 only through the first portion 21.

The installation process is as follows: the filtering membrane is sleeved outside the supporting piece 3 to form a cylindrical-like structure, and then the fixing ring 4 is sleeved outside the supporting piece 3 and the filtering membrane, so that the fixing ring 4 is used for fixing the first part 21 of the filtering membrane on the side wall 33 of the supporting piece 3; the fixing ring 4 is then moved towards the first end 31 of the support 3, so that the filter membrane is stretched and stretched over the outer surface of the support 3.

Of course, in other embodiments, two fixing rings may be disposed, one near the first end of the supporting member and the other near the second end of the supporting member, where the two fixing rings fix two axial ends of the first portion of the filtering member respectively, and the fixing ring near the second end of the supporting member fixes the second portion of the filtering member on the periphery of the second end of the supporting member and covers the second end of the supporting member, and at this time, the first portion and the second portion of the filtering member may be in an integral structure or a split structure. In other embodiments, the fixing rings can be three or more, the spacing sleeve is arranged on the periphery of the supporting piece, and the spacing sleeve is matched with the supporting piece to form a clamp for the filtering component so as to fix the filtering component on the supporting piece. The retaining rings also occupy part of the filter area of the filter element, preferably one in number.

The fixing ring 4 and the outer side wall 33 of the shell 1 can be fixed in various manners, and the fixing ring 4 can be in interference fit with the outer side wall 33 of the shell 1 and the filter component 2, or can be in sealing clamping connection with the outer side wall 33 of the shell 1 and can clamp and fix the periphery of the opening end of the filter component 2; it is also possible to use a way in which the fixing ring 4 is welded together with the open end of the filter element 2 to the outer side wall 33 of the housing 1.

In the embodiment shown in fig. 3, the inside of the housing 1 is provided with a welding step surface 111, and the end surface of the support 3 and the fixing ring 4 are opposed to and welded to the welding step surface 111. Specifically, the end face of the fixing ring 4 and the end face of the first end 31 of the supporting member 3 are opposite to the welding step face 111, and then the fixing ring 4, the supporting member 3, the filtering component 2 between the fixing ring 4 and the supporting member 3 are welded on the welding step face 111 in a one-pass manner, so that the fixing ring 4, the supporting member 3 and the filtering component 2 are fixed simultaneously.

Preferably, a gap 41 is provided between the outer side wall 33 of the fixing ring 4 and the inner wall of the barrel 12, and during the welding process, the welding liquid can enter the gap 41, so that a large amount of welding liquid is prevented from being extruded into the second flow channel 35 due to the fit between the fixing ring 4 and the inner wall of the barrel 12, and larger protrusions are formed, occupy the space of the second flow channel 35 and further interfere the liquid flow.

In this embodiment, the first end plate 11 and the cylinder 12 are in a split structure, the opposite ends of the first end plate 11 and the cylinder 12 are also in welded sealing connection, the welding step surface 111 is disposed on the end surface of the first end plate 11 facing the cylinder 12, and as a preferred mode, the fixing ring 4, the supporting piece 3 and the end surface of the cylinder 12 are welded together with the welding step surface 111 on the first end plate 11, so that the number of welding times is reduced, on one hand, the assembly steps can be reduced, on the other hand, the unstable welding seam caused by multiple welding can be avoided, and the welding position is easy to break to influence the tightness of the welding position.

As shown in fig. 3 and 7, a plurality of abutting pieces 16 are provided in the housing 1, and the abutting pieces 16 are located between the second communication port 15 and the second end 32 of the support 3 and abut against the outer surface of the second portion 22. The abutment 16 may be provided on the inner surface of the second end plate 13 or on the inner surface of the cylinder 12, the abutment 16 protruding toward the center axis of the housing 1, extending from the inner surface of the housing 1 to the outer surface of the second portion 22 of the filter element 2, and the abutment 16 serving to fix the second portion 22 of the filter element 2 at multiple points, limit the axial movement distance and the axial deformation degree of the second portion 22, and improve the impact resistance of the second portion 22. The abutting piece 16 occupies part of the filtering area of the second portion 22, the abutting surface 161 of the abutting piece 16 and the outer surface of the second portion 22 is not easy to be excessively large, meanwhile, the abutting force of the abutting piece 16 on the second portion 22 is easily concentrated due to the excessively small area of the abutting surface 161, and the second portion 22 is punctured due to the excessively large pressure; therefore, the abutment surface 161 is preferably a square plane with an aspect ratio approaching 1, and the convex edges of the abutment 16 near the second portion 22 have rounded corners, so as to avoid damaging the second portion 22 when the second portion 22 is deformed.

As shown in fig. 3, preferably, the axes of the first communication port 14, the second communication port 15 and the support member 3 are coaxial, and the shortest flow path formed between the first communication port 14 and the second communication port 15 is the first flow path 34, the second portion 22 of the filter element 2 and the third flow path 36, and the flow resistance of the liquid in this straight flow path is the smallest, so that the liquid is guided to be filtered preferentially in the second portion 22 of the filter element 2. As shown in fig. 5 and 6, the inner wall of the housing 1 is provided with three support bars 17, which are abutted against the outer surface of the first portion 21, and the radial thickness of the three support bars 17 is the same and are circumferentially distributed with the axis of the housing 1 as the central axis, so that when the support member 3 is placed in the housing 1, the three support bars 17 can make the support member 3 have a high concentricity with the housing 1, and the first flow channel 34, the second portion 22 and the third flow channel 36 of the filter member 2 are the shortest flow paths formed between the first communication port 14 and the second communication port 15 in the axial direction. The three supporting strips 17 can also play a clamping role on the supporting piece 3, so that the phenomenon that the welding parts of the supporting piece are easy to fall off due to shaking during use is avoided.

As shown in fig. 7 and 8, the support bar 17 is located in the second flow passage 35, the abutting piece 16 is located in the third flow passage 36, the junction of the support bar 17 and the abutting piece 16 is located at the communication between the second flow passage 35 and the third flow passage 36, the support bar 17 and the abutting piece 16 are of an integral structure, and the support bar 17 and the abutting piece 16 are flush with the side wall 33 in the circumferential direction of the housing 1. The supporting bar 17 and the abutting piece 16 can block the fluid, if the supporting bar 17 and the abutting piece 16 are arranged in a split and staggered way, a gap is formed between the second flow channel 35 and the third flow channel 36, and the resistance to the fluid is larger, so that the supporting bar 17 and the abutting piece 16 are of an integrated structure, the gap between the supporting body and the abutting piece 16 is reduced, the side wall 33 of the supporting bar 17 and the abutting piece 16 in the circumferential direction of the shell 1 is flush, no convex surface or concave surface exists, and the fluctuation of the fluid when flowing through the side wall 33 is reduced; the support bar 17 and the abutting piece 16 adopting the structure can effectively reduce the resistance when the liquid flows through the support bar 17 and the abutting piece 16.

The abutment 16 also has a function: for pre-positioning of the support 3 during welding. Specifically, under the condition that the supporting member 3, the fixing ring 4 and the cylinder 12 are welded together on the first end plate 11, when the supporting member 3 presses the second portion 22 of the filter component 2 against the abutment member 16, the supporting member is axially positioned, and the end face of the first end 31 of the supporting member 3 is just coplanar with the end face of the cylinder 12, so that welding is facilitated. Meanwhile, the support bars which are circumferentially distributed by taking the axis of the shell 1 as the central axis are used for circumferentially positioning the support pieces, so that the support pieces are prevented from deviating from the central axis of the shell, the central axis of the support pieces after welding and fixing is ensured to be basically coincident with the central axis of the shell, and the axes of the first communication port, the second communication port and the support pieces are coaxial.

Preferably, the end surface of the supporting bar 17 is spaced from the fixed ring 4, so that the supporting bar 17 is prevented from completely dividing the second flow channel 35 into a plurality of areas, occupying the space of the second flow channel and affecting the flow rate of the liquid in the second flow channel, and the end surface of the supporting bar 17 facing the fixed ring 4 is a guiding inclined surface 171, so that the liquid is prevented from directly colliding with the end surface of the supporting bar 17 to form turbulence, and meanwhile, the liquid can be guided into the second flow channels 35 at two sides of the supporting bar 17. Another function of the guide inclined surface 171 is that, when the support member is inserted into the housing, since the end surface of the support bar is spaced apart from the fixing ring, the inner diameter of the insertion end of the housing is large, and the guide inclined surface plays a guiding role on the support member, so that the support member is conveniently inserted into the housing.

The above embodiments are only preferred embodiments of the present utility model, and the scope of the present utility model is not limited thereto, but any insubstantial changes and substitutions made by those skilled in the art on the basis of the present utility model are intended to be within the scope of the present utility model as claimed.

Claims (10)

1. A pre-filter, comprising:

the shell is provided with a first end plate, a second end plate and a cylinder body, wherein the cylinder body is connected with the first end plate and the second end plate in a sealing way, a first communication port is formed in the first end plate, and a second communication port is formed in the second end plate;

a filter member located inside the housing;

a support for supporting the filter element, having a first end and a second end at both axial ends, the first end being sealingly connected to the housing;

wherein,

a first flow passage communicated with the first communication port is formed in the support piece;

the outer side surface of the support piece and the inner wall of the shell are arranged at intervals to form a second flow passage;

the second end of the supporting piece and the second communication port are arranged at intervals to form a third flow passage;

the filter element includes a first portion overlying a side of the support member and a second portion overlying a second end of the support member, the first portion being located on the first flow channel and the second flow channel flow path, the second portion being located on the first flow channel and the third flow channel flow path.

2. The prefilter of claim 1 wherein said filter element is disposed around the periphery of the support member; wherein the second end of the supporting piece is provided with a plurality of through holes; or (b)

The second end of the supporting piece is provided with an opening.

3. The prefilter of claim 1 wherein said filter element is disposed around the inner periphery of a support member, said support member having a second end with a plurality of perforations therethrough.

4. A pre-filter according to any one of claims 1 to 3, wherein the filter element first and second portions are of unitary construction.

5. The prefilter of claim 2 wherein said support member is sleeved with a retaining ring and cooperates with said support member to form a clamp for said filter element to secure said filter element to said support member.

6. The prefilter of claim 5 wherein said housing has a weld step surface disposed therein, said support member end surface and said retaining ring being welded against said weld step surface.

7. The prefilter of claim 1 wherein a plurality of abutments are provided in said housing, said abutments being located between said second communication port and the second end of said support and abutting the outer surface of said second portion.

8. The prefilter of claim 7 wherein said first communication port, said second communication port, and said support member are coaxial about their axes; at least three support bars are arranged on the inner wall of the shell and are in butt joint with the outer surface of the first part.

9. The prefilter of claim 8, wherein a support bar is integral with said abutment and said support bar and said abutment are flush with a sidewall of said housing in a circumferential direction.

10. The prefilter of claim 1 wherein the side wall of the support member has a plurality of holes, the walls of said holes being inclined toward the inner surface of said first portion.