Deionizer

Abstract

A protection piece is arranged on the inner surface of at least one cover body, on one hand, when an opening in the cover body serves as a liquid inlet end and a filter piece is pressed to deform, the ratio of the axial distance between the filter piece and the protection piece to the outer diameter of the filter piece is not larger than 6%, and on the other hand, the protection piece is not larger than 6%; the protection piece can limit the deformation amplitude of the filter piece and prevent the filter piece from being pressed and broken; on the other hand, the through holes in the protection piece guarantee circulation of the liquid, the area, right opposite to the opening, of the filter piece is the area with the maximum liquid flow speed and the area with the maximum impact force, and when the area corresponds to at least part of the area of at least one through hole, the liquid flow speed is increased. After deformation, the filter can abut against part of the edge of the through hole, namely the solid structure of the protection piece, the deformation amplitude is controlled, liquid can directly flow into the through hole and quickly flow to ion exchange resin particles, and the liquid treatment rate is ensured.

Description

Technical Field

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

[0002] During the operation of the fuel cell, heat is continuously generated due to activation voltage loss, ohmic voltage loss and concentration voltage loss. The operating temperature of the fuel cell is 60-80°C. The continuously generated heat will cause the fuel cell to overheat. The existing heat dissipation system mainly dissipates heat from the fuel cell through circulating cooling water. The ion content in the cooling water is crucial to the stable operation of the fuel cell. However, during operation, the air compressor, intercooler, etc. will continuously precipitate ions into the cooling water. As the ion content in the cooling water continues to increase, the conductivity of the cooling water will gradually increase. The fuel cell is at risk of leakage, and excessive conductivity may cause the fuel cell bipolar plate to be broken down. A deionizer is needed to remove ions from the cooling water.

[0003] A filter element and a filter including the filter element disclosed in utility model patent CN213790377U include a liquid-impermeable shell, a filter medium fixed inside the shell, and a first end cap and a second end cap sealed and fixed to the filter medium and the first end and the second end of the shell respectively. The filter medium includes granular resin and pre-filter plates located at both ends. The granular resin is used to remove ions in cooling water. The pre-filter plate allows liquid to pass but not granular resin, and can block the granular resin inside the shell to prevent the granular resin from leaking out of the shell.

[0004] The pre-filter plate is generally a resin sintered sheet. The resin sintered sheet is a disc-shaped component formed by sintering PP particles. The internal gap is relatively large, which may reach more than 30 microns. Therefore, the mechanical strength of the resin sintered sheet is relatively poor and it is easy to break under pressure, causing the resin particles to leak out. The deionizer cannot be used any more and is scrapped prematurely.

[0005] Therefore, it is necessary to improve the structure of the existing deionizer to solve the problem of the pre-filter plate at the end of the resin particles being broken under pressure. Summary of the invention

[0006] In view of the shortcomings of the prior art, the utility model aims to provide a deionizer, which solves the problem of filter discs at the ends of resin particles in the prior art being broken under pressure.

[0007] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0008] A deionizer comprises a shell and ion exchange resin particles filled therein, wherein the shell comprises a cylinder and covers sealed and fixed at both ends of the cylinder, and each of the covers is provided with an opening communicating with an inner cavity of the shell;

[0009] The inner surface of the cover is fixed with a filter sheet, and the filter sheet seals and separates the opening from the ion exchange resin particles;

[0010] A protective member is also fixed to the inner surface of at least one of the cover bodies, and the protective member has a plurality of through holes. The protective member is located between the filter plate and the ion exchange resin particles, and the ratio of the axial spacing between the filter plate and the protective member on the same side to the outer diameter of the filter plate is not greater than 6%, and the area of ​​the filter plate facing the opening faces a partial area of ​​at least one through hole.

[0011] The deionizer of the utility model has filter plates fixed on the inner surfaces of the two cover bodies. The filter plates can confine the ion exchange resin particles inside the cylinder. The filter plate located at the liquid inlet end is subjected to the greater impact force brought by the incoming liquid and will deform in the direction of the ion exchange resin particles. Therefore, a protective member is provided on the inner surface of at least one of the cover bodies. When the opening on the cover body serves as the liquid inlet end and the filter plate is deformed under pressure, since the ratio of the axial distance between the filter plate and the protective member to the outer diameter of the filter plate is not greater than 6%, the protective member can limit the deformation amplitude of the filter plate, thereby preventing the filter plate from being excessively deformed and broken under pressure. On the other hand, the through holes on the protective member ensure the circulation of the liquid, and the area where the filter plate faces the opening is the area with the maximum liquid flow rate and is also the area subject to the greatest impact force. This area corresponds to a partial area of ​​at least one through hole. After being deformed by the impact of the incoming liquid, the part of this area can abut against the edge of the through hole to control the deformation amplitude, and the liquid passing through this area directly flows into the through hole and quickly flows to the ion exchange resin particles, that is, the liquid can quickly pass through the through hole, flow to the ion exchange resin particles, and quickly remove ions in the liquid.

[0012] Furthermore, the protective member and the filter plate on the same side are axially spaced apart, and the ratio of the axial spacing therebetween to the outer diameter of the filter plate is no more than 2%; the ratio of the radial width of the area where the outer ring of the filter plate and the inner surface of the cover body are welded to the outer diameter of the filter plate is 3%-6%.

[0013] The protective member and the filter plate are arranged at an axial interval to prevent the solid part of the protective member from blocking the filter plate, thereby affecting the speed of the liquid passing through the filter plate; the liquid can achieve initial diffusion in the filter plate, quickly pass through the filter plate, and flow to the resin particles from the through holes on the protective member; on this basis, the ratio of the axial spacing between the two and the outer diameter of the filter plate is further limited to ensure that the filter plate is supported in time after bending and deformation to avoid excessive deformation. Similarly, in order to retain the flow area of ​​the filter plate, the filter plate only forms a welding area between the outer ring and the inner surface of the cover body, and the ratio of the radial width of the welding area to the outer diameter of the filter plate is controlled at 3%-6%, which can not only ensure the welding strength between the filter plate and the inner surface of the cover body, but also limit the deformation amplitude of the filter plate, while ensuring that the filter plate has a large enough area for initial filtration and radial dispersion of liquid.

[0014] Furthermore, the inner surface of the cover body includes a first annular surface and a second annular surface which are axially spaced apart, the second annular surface is located radially outside the first annular surface, the first annular surface is located at the outer periphery of the opening, and the second annular surface is closer to the ion exchange resin particles than the first annular surface;

[0015] The filter completely covers the first annular surface, and its outer ring is welded and fixed to the outer ring of the first annular surface; the outer ring of the protective element is welded and fixed to the second annular surface.

[0016] The filter plate basically covers the first annular surface, so that the outer edge of the filter plate is as close to the inner wall of the cylinder as possible in the radial direction, and the liquid entering from the opening of the cover body can be dispersed along the circumferential and radial directions of the filter plate, as close to the inner wall of the cylinder as possible, that is, the liquid can be dispersed toward the inner wall of the cylinder as much as possible, which is beneficial to improve the utilization rate of the ion exchange resin particles; at the same time, the inner diameter of the second annular surface is greater than or equal to the outer diameter of the first annular surface, the outer diameter of the protective member is greater than the outer diameter of the filter plate, and the area of ​​the filter plate and the through hole on the protective member corresponding to the protective member is larger, and is staggered with the solid area used for welding on the outer ring of the protective member, which can reduce the interference of the solid area of ​​the protective member on the flow of liquid, so that the ion exchange resin particles close to the inner wall of the cylinder can also be wetted and penetrated by the liquid, thereby improving the utilization rate of the ion exchange resin particles and the ion removal efficiency; and the filter plate is only welded and fixed to the outer ring of the first annular surface by the outer ring, and a small amount of welding area cannot play a role in intercepting resin particles and particulate pollutants. The remaining area can be used to intercept particulate pollutants in the liquid and prevent the ion exchange resin particles from leaking out, retaining more available area.

[0017] Furthermore, the protective member includes a plate-like body and a convex ring convexly arranged on the outer circle of the first end surface of the plate-like body, and the protective member is welded to the second annular surface through the convex ring; a plurality of through holes are evenly distributed in the plate-like body.

[0018] The function of the convex ring is, on the one hand, to facilitate the welding of the protective part to the inner surface of the cover body, and on the other hand, to facilitate the control of the axial spacing between the protective part and the filter plate so that it is within the above-mentioned range; the plate-like body plays the role of supporting and protecting the filter plate; the arrangement of the through holes is also conducive to the uniform dispersion of the liquid into the interior of the cylinder, and further contact with the resin particles, so that the ions in the liquid can be adsorbed and removed, and the ions in the water can be removed.

[0019] Furthermore, the radial width of the area where the outer ring of the filter plate and the outer ring of the first annular surface are welded is 3%-6% of the outer diameter of the filter plate, which can not only ensure the welding strength between the filter plate and the inner surface of the cover body, but also limit the deformation amplitude of the filter plate, and at the same time ensure that the filter plate has a sufficiently large area for preliminary filtration and radial dispersion of liquid.

[0020] Furthermore, the radial width of the area where the outer ring of the protective member and the second annular surface are welded is 3%-8% of the outer diameter of the protective member to ensure the welding strength between the protective member and the second annular surface.

[0021] Furthermore, an overflow portion is formed on the radial inner side of the connection between the outer ring of the protective member and the second annular surface, and the overflow portion is adhered to the outer ring of the filter plate; the overflow portion can not only ensure that the outer ring of the protective member completely covers the second annular surface and is welded, but also form a fixed area on the opposite end surface where the filter plate is welded to the first annular surface, thereby improving the connection strength between the filter plate and the cover body and avoiding the rupture of the welding area between the filter plate and the first annular surface under the impact force of the liquid.

[0022] Furthermore, a cavity is formed between the radial inner side of the convex ring, the first end surface of the plate-like body and the surface of the filter disc, the maximum radial width of the cavity is L1, the inner diameter of the cylinder is L2, and L1:L2≥80%.

[0023] Such arrangement makes the radial width of the cavity as close as possible to the inner diameter of the cylinder, so that the cavity can cover as many ion exchange resin particles as possible, the liquid flows from the cavity through the through holes to the ion exchange resin particles, and the ion exchange resin particles at various positions in the cylinder can be wetted and penetrated by the liquid.

[0024] Furthermore, the aperture of the through hole is R1, the outer diameter of the ion exchange resin particle is R2, and R1:R2≥8.

[0025] After being wetted, the ion exchange resin particles will swell and increase in volume. The cylinder may not be able to accommodate all the ion exchange resin particles. The diameter of the through hole is relatively large, so that the resin particles can enter the through hole, and the protective member itself has a certain thickness, so that there is some space inside the through hole. When there is an axial gap between the protective member and the filter plate, some resin particles can also be accommodated. In this way, it can be avoided that the expanded ion exchange resin particles are stacked too closely, resulting in excessive flow resistance, which is not conducive to the rapid passage of liquid.

[0026] Furthermore, the plate-like body has a second end face opposite to the first end face, the second end face is provided with a protrusion, and the protrusion is located between the through hole and the outer edge of the second end face.

[0027] The function of the protrusion is to provide a gripping point when the protective part is welded to the inner surface of the cover; the outer diameter of the plate-like body is smaller than the inner diameter of the cylinder, so the outer diameter of the protrusion is also smaller than the inner diameter of the cylinder. After the ion exchange resin particles are loaded and the outer shell is assembled, the protrusion is inserted between the ion exchange resin particles to avoid affecting the liquid flow near the inner wall of the cylinder.

[0028] Furthermore, the deionizer also includes a buffer plate disposed between the filter sheet and the opening, the buffer plate is welded and fixed to the inner surface of the cover body, and the buffer plate has a plurality of through holes.

[0029] The function of the buffer plate is to disperse the liquid, reduce the flow rate, and reduce the impact of the liquid on the filter plate to avoid the filter plate from breaking when the liquid flow rate at the inlet is higher.

[0030] In summary, compared with the prior art, the present invention has at least the following beneficial effects:

[0031] The deionizer of the utility model has filter plates fixed on the inner surfaces of the two cover bodies. The filter plates can confine the ion exchange resin particles inside the cylinder. The filter plates located at the liquid inlet end are subjected to the greater impact force caused by the incoming liquid and will deform toward the direction of the ion exchange resin particles. Therefore, a protective member is provided on the inner surface of at least one of the cover bodies.

[0032] On the one hand, when the opening on the cover body serves as the liquid inlet and the filter plate is deformed under pressure, the ratio of the axial spacing between the filter plate and the protective member on the same side to the outer diameter of the filter plate is no more than 6%. The protective member can limit the deformation amplitude of the filter plate and prevent the filter plate from being crushed under pressure.

[0033] On the other hand, the through holes on the protective member ensure the circulation of the liquid, and the area where the filter plate faces the opening is the area with the maximum liquid flow rate and is also the area subject to the greatest impact force. When this area corresponds to a partial area of ​​the through hole, the filter plate can abut against a partial edge of the through hole to control the deformation amplitude, and can also allow the liquid to flow directly into the through hole and quickly flow to the ion exchange resin particles, thereby ensuring the liquid treatment rate. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] In order to more clearly illustrate the specific implementation methods of the utility model or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0035] Figure 1 The figure is a schematic cross-sectional structure diagram of a deionizer according to an embodiment of the utility model.

[0036] Figure 2 The figure is a schematic diagram of the cross-sectional structure of a cylinder according to an embodiment of the utility model.

[0037] Figure 3 The figure is a schematic cross-sectional structure diagram of a cover body according to an embodiment of the utility model.

[0038] Figure 4 This is a corresponding schematic diagram of an opening and a through hole in an embodiment of the utility model.

[0039] Figure 5 This is a corresponding schematic diagram of an opening and a through hole in another embodiment of the utility model.

[0040] Figure 6 This is a corresponding schematic diagram of an opening and a through hole in another embodiment of the utility model.

[0041] Figure 7 The figure is a schematic cross-sectional structure diagram of a protective member according to an embodiment of the utility model.

[0042] Figure 8 The figure is a top view of a protective member according to an embodiment of the utility model.

[0043] Fig. 9 This is a schematic cross-sectional structure diagram of a deionizer according to another embodiment of the utility model.

[0044] Fig.10 This is a schematic cross-sectional structure diagram of a deionizer according to another embodiment of the utility model.

[0045] Fig.11 for Fig.10Enlarged view of point A in .

[0046] Description of Reference Numerals

[0047] 10. housing; 11. cylinder; 12. cover; 121. first annular surface; 122. second annular surface; 123. third annular surface; 124. step side wall; 13. opening; 14. joint;

[0048] 20. Filter; 21. Impact area;

[0049] 30. Protective member; 31. Protruding ring; 32. Plate-shaped body; 33. Through hole; 34. Protrusion; 35. Overflow portion; 36. Cavity; 37. First end surface; 38. Second end surface;

[0050] 40. Buffer board; 41. Via hole;

[0051] 50. Resin particles. DETAILED DESCRIPTION

[0052] The technical solution of the utility model will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0053] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0054] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" 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 it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0055] The deionizer of the utility model embodiment includes a shell 10 and ion exchange resin particles filled therein. For the convenience of description, the ion exchange resin particles are referred to as resin particles 50 below. The shell 10 includes a cylinder 11 and a cover 12 sealed and fixed at both ends of the cylinder 11. Each cover 12 is provided with an opening 13 connected to the inner cavity of the shell 10, wherein one opening 13 can be used as an inlet and the other opening 13 can be used as an outlet. In some embodiments, the outer end surface of the cover 12 is a plane, and the opening 13 is sealed and connected to the external device by a crimping sealing ring, such as the attached Fig.10 In other embodiments, the outer end surface of the cover body 12 has an integrally formed connector 14, which is connected to an external device through the connector 14, and the opening 13 passes through the connector 14 to achieve the input or output of liquid.

[0056] As attached Figure 1 In the illustrated embodiment, filter sheets 20 are fixed to the inner surface of the cover 12, and the filter sheets 20 seal and separate the opening 13 and the resin particles 50, that is, the filter sheets 20 can confine the resin particles 50 inside the housing 10, specifically, in the cavity formed by the cylinder 11 and the two filter sheets 20, to prevent the resin particles 50 from leaking out of the opening 13 on the cover 12. At the same time, the filter sheets 20 can realize the inflow, diffusion and outflow of the liquid, and can also intercept particulate pollutants to improve the purity of the treated liquid.

[0057] The shear strength of the filter sheet 20 of the embodiment of the utility model is 300-750N, and the thickness is 1-6mm, so that the mechanical strength of the filter sheet 20 itself is relatively high and can withstand certain deformation. The shear strength is measured by a strength tester or a computer servo tensile machine. In order to ensure the filtering performance of the filter sheet 20, meet the required interception accuracy, and take into account the mechanical strength of the filter sheet 20, the pore size of the filter sheet 20 is 1-100um, and the porosity is 30-40%. Among them, the porosity calculation formula is: P = (1-actual weight / (theoretical density*actual volume))*100%.

[0058] In order to ensure the processing efficiency, the flow rate of the liquid entering the housing 10 is generally fast, which produces a large impact force on the filter plate 20. In order to protect the filter plate 20, at least the inner surface of the cover body 12 whose opening 13 is used as the entrance is fixed with a protective member 30, and the protective member 30 is arranged between the filter plate 20 and the resin particles 50. The ratio of the axial spacing between the filter plate 20 and the protective member 30 on the same side to the outer diameter of the filter plate 20 is not greater than 6%. The protective member 30 can limit the deformation amplitude of the filter plate 20 and prevent the filter plate 20 from being excessively deformed and broken under pressure. Of course, in other embodiments, the protective member 30 can be arranged on the inner surface of both covers 12, that is, the axial inner side of the opening 13 as the entrance and the opening 13 as the outlet is provided with a protective member 30. The protective member 30 arranged at the outlet can reduce the squeezing force of the resin particles 50 on the filter plate 20. The protective member 30 is provided with a plurality of through holes 33 for liquid to pass through. After the liquid flows in through the opening 13 as the inlet, it passes through the filter sheet 20, and then through the through hole 33, flows to the resin particles 50 to remove ions. The treated liquid passes through the through hole 33 of the other protective member 30, passes through the filter sheet 20, and then flows out from the opening 13 as the outlet. The filter sheet 20 and protective member 30 on the same side here refer to the filter sheet 20 and protective member 30 fixed to the same cover body 12.

[0059] There are two situations for the relative position of the protective member 30 and the filter plate 20: (1) The filter plate 20 and the protective member 30 are axially spaced, and the ratio of the axial spacing H between the two to the outer diameter D of the filter plate 20 is not greater than 6%; because when the ratio is greater than 6%, for example, the ratio is 6.5% or 7% or greater, that is, the axial spacing H is 6.5% or 7% or greater of the outer diameter D of the filter plate 20, the axial spacing H will exceed the limit deformation amplitude of the filter plate 20. Then, during use, the filter plate 20 will reach the maximum deformation amplitude, but still cannot obtain the support of the protective member 30, resulting in excessive deformation and breakage of the filter plate 20. (2) The filter plate 20 and the protective member 30 are arranged in close contact, and the axial spacing is close to or equal to 0.

[0060] Regardless of the above situation, when the area of ​​the filter plate 20 facing the opening 13 is bent and deformed to a certain extent in the direction of the resin particles 50 under the impact of the liquid flowing in from the opening 13 serving as the inlet, it will abut against the end face of the protective member 30, thereby limiting the bending and deformation amplitude of the filter plate 20 and preventing it from breaking due to excessive deformation, thereby protecting the filter plate 20.

[0061] Generally, the user's liquid inlet flow rate is basically below 150L / h. The ratio of the axial spacing between the filter plate 20 and the protective member 30 to the outer diameter of the filter plate 20 is controlled to be no more than 6%. This can ensure that after the filter plate 20 is deformed under the impact of the incoming liquid, it can obtain the support of the protective member 30 in time, and can ensure that the filter plate 20 will not be excessively deformed, and the structure can be kept intact.

[0062] For the working condition where the liquid inlet flow rate is 300L / h or above, the test found that when the ratio of the axial distance between the filter plate 20 and the protective member 30 to the outer diameter of the filter plate 20 exceeds 2%, for example, in some test examples, when the ratio is 2.3%, 3%, 4%, 5% or 5.5%, the filter plate 20 still has the problem of excessive deformation and rupture. Therefore, as a preferred embodiment, as shown in the attached Figure 1 As shown, the protective member 30 and the filter plate 20 are arranged axially at intervals, which can prevent the solid part of the protective member 30 from blocking the filter plate 20 and affecting the flow rate of the liquid through the filter plate 20; therefore, the liquid can achieve initial diffusion in the filter plate 20, and quickly pass through the filter plate 20, and flow to the resin particles 50 from the through hole 33 on the protective member 30. The ratio of the axial spacing H to the outer diameter D of the filter plate 20 meets the following conditions, H: D ≤ 2%. After testing and verification, when H: D ≤ 2%, it can ensure that the filter plate 20 is supported in time after bending and deformation under the working condition of the flow rate exceeding 300L / h, and avoid excessive deformation. Considering the outer diameter size of the filter plate 20 in the actual product, the value of the axial spacing H is generally not greater than 2mm. The outer diameter of the filter plate 20 is 40mm, 42mm, 44mm, 46mm, 48mm or 50mm, etc.

[0063] Since the area where the filter plate 20 faces the opening 13 is the area with the maximum liquid flow rate and is also the area with the greatest impact force, the area where the filter plate 20 faces the opening 13 faces at least a portion of at least one through hole 33. After the area is deformed by the impact of the liquid entering from the opening 13, the part adjacent to the area can abut against the edge of the through hole 33, that is, the solid structure of the protective member 30, so the deformation amplitude can be controlled, and the liquid passing through the area can directly flow into the through hole 33 and quickly flow to the resin particles 50, that is, the liquid can quickly pass through the through hole 33, flow to the resin particles 50, and quickly remove ions in the liquid, thereby preventing the protective member 30 from significantly slowing down the liquid flow rate and affecting the filtration efficiency.

[0064] Supplementary explanation: the axial direction mentioned in this application refers to the deionizer Figure 1 When placed in the direction shown, the arrow points in the direction.

[0065] For the convenience of description, the area of ​​the filter plate 20 facing the opening 13 is called the impact area 21, and the relative positions of the impact area 21 and the through hole 33 specifically include the following situations:

[0066] As attached Figure 1 As shown, the aperture of the through hole 33 is equal to the inner diameter of the opening 13, and the area of ​​the impact region 21 is substantially equal to the area of ​​the through hole 33. The liquid can directly pass through the filter plate 20 and flow directly into the through hole 33, and quickly flow toward the resin particles 50. The part adjacent to the impact region 21 abuts against the edge of the through hole 33, and the deformation amplitude of the impact region 21 can be controlled, that is, the deformation amplitude of the filter plate 20 is limited.

[0067] As attached Figure 4 As shown, the aperture of the through hole 33 is smaller than the inner diameter of the opening 13, and a through hole 33 and its edge are completely located in the axial projection of the opening 13. The liquid that passes through the impact area 21 and the portion directly opposite the through hole 33 can also directly flow into the through hole 33 and quickly flow toward the resin particles 50. The outer circle portion of the impact area 21 abuts against the edge of the through hole 33, thereby controlling the deformation amplitude of the maximum deformation area and limiting the deformation amplitude of the entire filter plate 20.

[0068] As attached Figure 5 As shown, the center of the through hole 33 is offset relative to the center of the opening 13, and only a partial area of ​​the through hole 33 and a partial solid structure of the protective member 30 are located in the axial projection of the opening 13. The liquid that passes through the impact area 21 and corresponds to the partial area of ​​the through hole 33 can directly flow into the through hole 33 and quickly flow toward the resin particles 50. The other parts of the impact area 21 abut against the solid structure of the protective member 30, thereby controlling the deformation amplitude of the maximum deformation area and limiting the deformation amplitude of the entire filter plate 20.

[0069] As attached Figure 6 As shown, the centers of the two through holes 33 are offset relative to the center of the opening 13, and partial areas of two or more through holes 33 and partial solid structures of the protective member 30 are located in the axial projection of the opening 13. In the peripheral portion of the impact area 21 corresponding to the partial areas of the two through holes 33, the liquid can quickly penetrate and directly flow into the through holes 33, and quickly flow toward the resin particles 50. The central portion of the impact area 21 abuts against the solid structure of the protective member 30, thereby controlling the deformation amplitude of the maximum deformation area and limiting the deformation amplitude of the entire filter plate 20.

[0070] The above four specific situations are only used to explain the meaning of "the area of ​​the filter plate 20 facing the opening 13 faces a part of the area of ​​at least one through hole 33", and are not limited to the above four specific situations. The meaning of "the area of ​​the filter plate 20 facing the opening 13 faces a part of the area of ​​at least one through hole 33" is: after the area of ​​the filter plate 20 subjected to the greatest impact force, that is, the impact area 21 mentioned above, is deformed and abuts against the protective member 30, the impact area 21 will not completely abut against the physical structure of the protective member 30, and at least part of it faces a part of the area of ​​the through hole 33, thereby ensuring that the liquid can quickly pass through the filter plate 20 and quickly flow to the resin particles 50 through the through hole 33, while ensuring that the filter plate 20 is supported in time to prevent the filter plate 20 from breaking.

[0071] In order to retain the flow area of ​​the filter plate 20, the filter plate 20 only forms a welding area between the outer ring and the inner surface of the cover body 12. The outer ring extends from the outer edge of the filter plate 20 to a certain range in the radial direction toward the center of the circle, and its range is basically coincident with the range of the welding area. In this embodiment, the ratio of the radial width of the outer ring to the outer diameter of the filter plate 20 is controlled at 3%-6%, that is, the ratio of the radial width of the welding area to the outer diameter of the filter plate 20 is controlled at 3%-6%, which can ensure the welding strength between the filter plate 20 and the inner surface of the cover body 12, limit the deformation amplitude of the filter plate 20, and ensure that the filter plate 20 has a large enough area for preliminary filtration and radial dispersion of liquid; If the ratio of the radial width of the welding area to the outer diameter of the filter disc 20 is less than 3%, the welding strength between the filter disc 20 and the inner surface of the cover body 12 is insufficient. Even with the support of the protective member 30, the welding area may be damaged by the pressure of the incoming liquid, resulting in welding failure, leakage and other problems; if the ratio of the radial width of the welding area to the outer diameter of the filter disc 20 is greater than 6%, the welding area occupies too large an area, wasting the effective area of ​​the filter disc 20, and may cause the resin particles 50 near the inner wall of the cylinder 11 to be unable to be fully infiltrated by the liquid, and the particle utilization rate is reduced. Considering the outer diameter size of the filter disc 20 in the actual product, the radial width of the welding area of ​​the filter disc 20 can be 1.5-3mm. For example, the radial width of the welding area of ​​the filter disc 20 is 1.5mm, 2mm, 2.5mm or 3mm, etc. In addition, the welding area formed by the outer circle of the filter plate 20 and the inner surface of the cover body 12 is radially separated from the opening 13 by a certain distance, that is, the welding area is radially separated from the impact area 21 of the filter plate 20, which is also beneficial to protecting the welding connection effect between the filter plate 20 and the cover body 12.

[0072] As attached Figure 3As shown, the inner surface of the cover body 12 of this embodiment includes a first annular surface 121 and a second annular surface 122 which are axially spaced apart. The second annular surface 122 is located radially outside the first annular surface 121. The second annular surface 122 is closer to the resin particles 50 than the first annular surface 121, which facilitates the sequential welding of the filter plate 20 and the protective member 30.

[0073] The first annular surface 121 is located at the outer periphery of the opening 13, and the filter plate 20 basically covers the first annular surface 121. The outer ring of the filter plate 20 is welded and fixed to the outer ring of the first annular surface 121. Accordingly, the radial width of the area where the outer ring of the filter plate 20 and the outer ring of the first annular surface 121 form a weld is 3%-6% of the outer diameter of the filter plate 20, and the center of the filter plate 20 basically coincides with the center of the opening 13, so that the liquid impact force on the welding area of ​​the filter plate 20 is relatively uniform and not easy to be partially torn.

[0074] The filter sheet 20 substantially covers the first annular surface 121, which has another effect, that is, the outer edge of the filter sheet 20 is as close to the inner wall of the cylinder 11 as possible in the radial direction, and the liquid entering through the opening 13 as the inlet can be dispersed along the filter sheet 20 in the circumferential and radial directions, as close to the inner wall of the cylinder 11 as possible, that is, the liquid can be dispersed toward the inner wall of the cylinder 11 as much as possible, which is conducive to improving the utilization rate of the resin particles 50. At the same time, as shown in the attached Figure 1 As shown, the second annular surface 122 is located radially outside the first annular surface 121, and the outer ring of the protective member 30 is welded and fixed to the second annular surface 122. It can be seen that the outer diameter of the protective member 30 is greater than the outer diameter of the filter plate 20. The outer ring of the protective member 30 is a solid structure, and this part of the solid structure is misaligned with the entire filter plate 20. The area corresponding to the through hole 33 on the filter plate 20 and the protective member 30 is larger, which can reduce the interference of the solid area of ​​the protective member 30 on the liquid flow direction, so that the resin particles 50 close to the inner wall of the cylinder 11 can also be wetted and penetrated by the liquid, that is, the utilization rate of the resin particles 50 and the ion removal efficiency are improved.

[0075] As attached Figure 7 and attached Figure 8 As shown, the protective member 30 includes a plate-like body 32 and a convex ring 31 convexly arranged on the outer circle of the first end surface 37 of the plate-like body 32; the plate-like body 32 is a circular plate structure with a plurality of through holes 33, which plays a role in supporting and protecting the filter plate 20; the plurality of through holes 33 are evenly distributed on the plate-like body 32, and the through holes 33 can be distributed around the center of the plate-like body 32 in a symmetrical manner, which is conducive to the liquid being evenly dispersed to the entire surface of the cylinder 11 and contacting with more resin particles 50, so that the ions in the liquid are adsorbed and removed, and the ions in the water are removed. The outer edge of the convex ring 31 is flush with the outer edge of the plate-like body 32, and the inner edge of the convex ring 31 is spaced from the edge of the outermost through hole 33 to ensure the structural strength of the protective member 30.

[0076] As attached Figure 1 As shown, the protective member 30 is welded to the second annular surface 122 through a convex ring 31. The convex ring 31 protruding from the first end surface 37 facilitates the positioning of the protective member 30 and the second annular surface 122. The welding method is hot-melt welding. Preferably, the radial width of the area where the outer ring of the protective member 30 and the second annular surface 122 are welded is 3%-8% of the outer diameter of the protective member 30 to ensure the welding strength of the protective member 30 and the second annular surface 122. If the ratio of the radial width of the welding area of ​​the protective member 30 to the outer diameter of the protective member 30 is less than 3%, the welding strength between the protective member 30 and the second annular surface 122 is insufficient, and when the impact force on the filter 20 is transmitted to the protective member 30, the welding area between the protective member 30 and the second annular surface 122 may be damaged; if the ratio of the radial width of the welding area of ​​the protective member 30 to the outer diameter of the protective member 30 is greater than 8%, the inner diameter of the convex ring 31 is too small, which hinders the liquid passing through the filter 20, or makes the effective area of ​​the filter 20 too small, and the liquid permeation efficiency is reduced; in addition, it will also cause the radial distance between the liquid passing through the filter 20 and the inner wall of the cylinder 11 to be too large, resulting in the resin particles 50 near the inner wall of the cylinder 11 cannot be fully infiltrated by the liquid, and the particle utilization rate is reduced. Considering the outer diameter size of the protective member 30 in the actual product, the end face of the convex ring 31 is welded with the second annular surface 122, and the radial width of the welding area is 2-4mm.

[0077] It should be noted that the axial gap H between the protective member 30 and the filter plate 20 refers to the axial distance between the first end face 37 of the plate-like body 32 and the first end face 37 of the filter plate 20 facing the plate-like body 32. Therefore, by controlling the axial height of the convex ring 31, the axial spacing between the protective member 30 and the filter plate 20 can be controlled.

[0078] Preferably, the outer ring of the protective member 30 completely covers the second annular surface 122 and is welded to prevent liquid from entering the end surface gap between the outer ring of the protective member 30 and the second annular surface 122 to form a dead angle.

[0079] Furthermore, as attached Fig.10 and Fig.11 As shown, an overflow portion 35 is formed radially inwardly at the connection between the outer ring of the protective member 30 and the second annular surface 122, and the overflow portion 35 is adhered to the outer ring of the filter plate 20; the overflow portion 35 can not only ensure that the outer ring of the protective member 30 completely covers the second annular surface 122 and is welded, but also form a fixed area on the opposite end surface of the filter plate 20 and the first annular surface 121, improve the connection effect between the filter plate 20 and the cover body 12, and avoid the welding area between the filter plate 20 and the first annular surface 121 from being broken under the impact force of the liquid. The shape of the overflow portion 35 may be irregular.

[0080] As attached Figure 1As shown, a cavity 36 is formed between the radial inner side of the convex ring 31, the first end face 37 of the plate-like body 32 and the surface of the filter plate 20; more specifically, there is an axial distance between the first annular surface 121 and the second annular surface 122, and a certain axial inner wall is formed on the inner surface of the cover body 12, which is referred to as a step side wall 124; the filter plate 20 has a thickness, and if the thickness of the filter plate 20 is less than the axial distance between the first annular surface 121 and the second annular surface 122, a cavity 36 is formed between the step side wall 124, the radial inner side of the convex ring 31, the first end face 37 of the plate-like body 32 and the inner surface of the filter plate 20; if the thickness of the filter plate 20 is greater than or equal to the axial distance between the first annular surface 121 and the second annular surface 122, a cavity 36 is formed between the radial inner side of the convex ring 31, the first end face 37 of the plate-like body 32 and the inner surface of the filter plate 20.

[0081] Since the inner diameter of the convex ring 31 may be inconsistent with the inner diameter of the second annular surface 122, the radial width of the cavity 36 may not be unique. The maximum radial width of the cavity 36 is L1, and the inner diameter of the cylinder 11 is L2. L1:L2≥80%. The above value range ensures that the cavity 36 covers the entire end surface of all resin particles 50 as much as possible. The resin particles 50 in all areas of the cylinder 11 play a practical adsorption role, the utilization rate of the resin particles 50 is improved, the ion adsorption capacity is increased, and the service life is long.

[0082] The existence of the cavity 36 also provides a more flexible storage space for the resin particles 50. On the one hand, when the cover 12 and the cylinder 11 are welded, the squeezed resin particles 50 can enter the cavity 36, preventing the resin particles 50 from entering between the welding surfaces of the cylinder 11 and the cover 12 and interfering with the welding. On the other hand, the resin particles 50 will swell and increase in volume after being wetted, and the cylinder 11 may not be able to accommodate all the resin particles 50. The diameter of the through hole 33 is relatively large, so that the resin particles 50 can enter the through hole 33 and then enter the cavity 36, avoiding the expanded resin particles 50 from being piled up too tightly, resulting in excessive flow resistance, which is not conducive to the rapid passage of liquid. In this embodiment, the aperture of the through hole 33 is R1, and the outer diameter of the resin particles 50 is R2, R1:R2≥8, so that the resin particles 50 can pass through the through hole 33 and enter the cavity 36.

[0083] Of course, in other embodiments, the protective member 30 is fitted to the filter plate 20, and the cavity 36 does not exist. The protective member 30 itself has a certain thickness, so that there is some space inside the through hole 33, and the aperture of the through hole 33 is R1, and the outer diameter of the resin particles 50 is R2, R1:R2≥8, so that the resin particles 50 can enter the through hole 33 and can also prevent the expanded resin particles 50 from being stacked too closely.

[0084] As attached Figure 7As shown, the plate-like body 32 has a second end face 38 opposite to the first end face 37, and the second end face 38 is provided with a protrusion 34, which is located between the through hole 33 and the outer edge of the second end face 38. The protrusion 34 can be a plurality of protrusions arranged at intervals, or it can be a ring structure. The function of the protrusion 34 is to provide a gripping point when the protective member 30 is welded to the inner surface of the cover body 12; the outer diameter of the plate-like body 32 is smaller than the inner diameter of the cylinder 11, so the outer diameter of the protrusion 34 is also smaller than the inner diameter of the cylinder 11. After the resin particles 50 are filled and the shell 10 is assembled, the protrusion 34 is inserted between the resin particles 50 to avoid affecting the flow of the liquid near the inner wall of the cylinder 11. Preferably, the protrusion 34 is a plurality of protrusions arranged at intervals, which is more conducive to the radial dispersion of the liquid near the inner wall of the cylinder 11.

[0085] As attached Fig. 9 In another embodiment shown, the deionizer further includes a buffer plate 40 disposed between the filter disc 20 and the opening 13. The buffer plate 40 is welded and fixed to the inner surface of the cover body 12, and the buffer plate 40 has a plurality of through holes 41. Specifically, the inner surface of the cover body 12 also has a third annular surface 123, which is located radially inward of the first annular surface 121 and relatively far away from the resin particles 50. The buffer plate 40 is welded and fixed to the third annular surface 123, and the diameter of the buffer plate 40 is larger than the inner diameter of the opening 13 and smaller than the diameter of the filter plate. All through holes 41 on the buffer plate 40 are located in the opening 13, and the number is large and the aperture is small, so that when the liquid flow rate at the inlet is higher, the liquid is dispersed, the flow rate is reduced, and the impact force of the liquid on the filter disc 20 is reduced, thereby preventing the filter disc 20 from breaking.

[0086] The above-mentioned implementation modes are only preferred implementation modes of the present invention, and cannot be used to limit the protection scope of the present invention. Any non-substantial changes and substitutions made by technicians in this field on the basis of the present invention shall fall within the scope of protection required by the present invention.

Claims

1. A deionizer, comprising a shell and ion exchange resin particles filled therein, wherein the shell comprises a cylinder and covers sealed and fixed at both ends of the cylinder, each of the covers being provided with an opening communicating with an inner cavity of the shell; characterized in that: The inner surface of the cover is fixed with a filter sheet, and the filter sheet seals and separates the opening from the ion exchange resin particles; A protective member is also fixed to the inner surface of at least one of the cover bodies, and the protective member has a plurality of through holes. The protective member is located between the filter plate and the ion exchange resin particles, and the ratio of the axial spacing between the filter plate and the protective member on the same side to the outer diameter of the filter plate is not greater than 6%, and the area of ​​the filter plate facing the opening faces at least a partial area of ​​at least one through hole.

2. The deionizer according to claim 1, characterized in that The protective member and the filter plate on the same side are axially spaced apart, and the ratio of the axial spacing between the two to the outer diameter of the filter plate is not greater than 2%; the ratio of the radial width of the area where the outer ring of the filter plate and the inner surface of the cover body are welded to the outer diameter of the filter plate is 3%-6%.

3. The deionizer according to claim 2, characterized in that The inner surface of the cover body comprises a first annular surface and a second annular surface which are axially spaced apart, the second annular surface is located radially outside the first annular surface, the first annular surface is located at the outer periphery of the opening, and the second annular surface is closer to the ion exchange resin particles than the first annular surface; The filter completely covers the first annular surface, and its outer ring is welded and fixed to the outer ring of the first annular surface; the outer ring of the protective element is welded and fixed to the second annular surface.

4. The deionizer according to claim 3, characterized in that The protective member comprises a plate-like body and a convex ring convexly arranged on the outer circle of the first end surface of the plate-like body, and the protective member is welded to the second annular surface through the convex ring; A plurality of through holes are evenly distributed in the plate-shaped body.

5. The deionizer according to claim 3, characterized in that The radial width of the area where the outer ring of the filter plate is welded to the outer ring of the first annular surface is 3%-6% of the outer diameter of the filter plate; and / or the radial width of the area where the outer ring of the protective member is welded to the second annular surface is 3%-8% of the outer diameter of the protective member.

6. The deionizer according to claim 3, characterized in that An overflow portion is formed on the radial inner side of the connection between the outer ring of the protective member and the second annular surface, and the overflow portion is adhered to the outer ring of the filter plate.

7. The deionizer according to claim 4, characterized in that A cavity is formed between the radial inner side of the convex ring, the first end surface of the plate-like body and the surface of the filter plate. The maximum radial width of the cavity is L1. The inner diameter of the cylinder is L2, and L1:L2≥80%.

8. The deionizer according to claim 1, characterized in that The aperture of the through hole is R1, the outer diameter of the ion exchange resin particle is R2, and R1:R2≥8.

9. The deionizer according to claim 4, characterized in that The plate-like body has a second end surface opposite to the first end surface. The second end surface is provided with a protrusion, and the protrusion is located between the through hole and the outer edge of the second end surface.

10. The deionizer according to claim 1 or 2, characterized in that: It also includes a buffer plate arranged between the filter plate and the opening, wherein the buffer plate is welded and fixed to the inner surface of the cover body, and the buffer plate has a plurality of through holes.

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