Composite filter element and water purification equipment

Abstract

The utility model discloses a composite filter element and water purification equipment, and relates to the technical field of water purification, the composite filter element comprises a shell, a separation cylinder, a rear filter element assembly and an air bag assembly; the shell is provided with a first water inlet and a first water outlet; the separation barrel is arranged in the shell and is provided with a first barrel cavity and a second barrel cavity, and the first barrel cavity and the second barrel cavity are communicated through a water passing hole; the rear filter element assembly is arranged in the first barrel cavity, the water inlet side of the rear filter element assembly is communicated with the first water inlet, and the water outlet side of the rear filter element assembly is communicated with the first water outlet; the air bag assembly comprises a mounting cover and an elastic piece, and the mounting cover and the elastic piece define a compressed air cavity. The mounting cover covers a cylinder opening of the second cylinder cavity, and the elastic piece is arranged in the second cylinder cavity; a protruding part is arranged on the side, facing the bottom of the second barrel cavity, of the elastic piece. The composite filter element disclosed by the utility model can solve the problem that the surface stress of the air bag piece is non-uniform and unbalanced when the air bag piece is impacted and extruded by water flow in the prior art.

Description

Technical Field

[0001] The utility model relates to the technical field of water purification, in particular to a composite filter element and water purification equipment. Background Art

[0002] In the related art, an airbag is provided in the shell of the composite filter element. When high-pressure water enters the shell, the high-pressure water flow will squeeze the airbag element to make it elastically deform, thereby compressing the closed chamber in the airbag element. When the composite filter element stops working, that is, when the booster pump stops pressurizing the water flow, the airbag element will return to its initial state to squeeze the pure water in the shell to make it flow back into the filter element, thereby reducing the proportion of waste water in the filter element and improving the taste of the first cup of water when the water purification equipment is restarted. However, the airbag element in the prior art is unevenly and unbalancedly stressed on the surface that is impacted and squeezed by the water flow, and there is a possibility that the surface is locally stressed, which causes some areas of the surface of the airbag element to be elastically deformed and compressed, and some areas are restricted and difficult to continue to be elastically deformed and compressed, thereby affecting the deformation effect of the airbag element, causing the airbag element to fail, and thus it is difficult to achieve the effect of improving the taste of the first cup of water of the water purification equipment. Utility Model Content

[0003] The main purpose of the utility model is to provide a composite filter element and water purification equipment, aiming to solve the problem in the prior art that the surface force of the airbag part is uneven and unbalanced when it is impacted and squeezed by water flow.

[0004] In order to achieve the above-mentioned purpose, the utility model proposes a composite filter element, which comprises a shell, a separator cylinder, a post-filter element assembly and an airbag assembly; the shell is provided with a first water inlet and a first water outlet; the separator cylinder is arranged in the shell, and the separator cylinder has a first cylinder cavity and a second cylinder cavity, and the first cylinder cavity and the second cylinder cavity are connected through a water hole; the post-filter element assembly is arranged in the first cylinder cavity, the water inlet side of the post-filter element assembly is connected to the first water inlet, and the water outlet side of the post-filter element assembly is connected to the first water outlet; the airbag assembly comprises a mounting cover and an elastic member, and the mounting cover and the elastic member are combined to form a compressed air cavity; the mounting cover covers the cylinder mouth of the second cylinder cavity, and the elastic member is arranged in the second cylinder cavity; wherein, the elastic member is provided with a protrusion on the side facing the bottom of the second cylinder cavity.

[0005] In one embodiment, the protrusion is arranged at the middle of the elastic member on a side facing the bottom of the second cylinder cavity.

[0006] In one embodiment, the protrusion abuts against the bottom of the second cylinder cavity.

[0007] In one embodiment, the water passing holes penetrate through the bottom of the second cylinder cavity and are provided in plurality. The plurality of water passing holes are provided on the outer periphery of the convex portion and are arranged at intervals along the circumferential direction of the convex portion.

[0008] In one embodiment, the elastic member includes a connecting portion and a deforming portion which are connected to each other. The mounting cover is provided with a mounting groove. The connecting portion is arranged in the mounting groove. The deforming portion is arranged in the second cylinder cavity. The mounting cover presses the connecting portion against the mouth of the second cylinder cavity. The convex portion is arranged on the deforming portion.

[0009] In one embodiment, the ratio range of the diameter of the convex portion to the diameter of the deforming portion is 0.125 - 0.25.

[0010] In one embodiment, the deforming portion is provided with at least two pleated segments connected axially along the deforming portion.

[0011] In one embodiment, the separating cylinder includes a separating plate, and a first cylinder body and a second cylinder body arranged on opposite sides of the separating plate. The first cylinder body forms the first cylinder cavity, and the second cylinder body forms the second cylinder cavity. The water passing holes are arranged on the separating plate.

[0012] In one embodiment, the diameter of the first cylinder body is smaller than the diameter of the second cylinder body. The composite filter element further includes a pre-filter element assembly which is sleeved on the first cylinder body.

[0013] In one embodiment, the cross-section of the convex portion in the radial direction of the separating cylinder is circularly arranged.

[0014] In one embodiment, the convex portion is a raised portion on the side of the elastic member facing the bottom of the second cylinder cavity.

[0015] The present utility model further provides a water purification device which includes the composite filter element. The composite filter element includes a housing, a separating cylinder, a post-filter element assembly and an airbag assembly. The housing is provided with a first water inlet and a first water outlet. The separating cylinder is arranged in the housing. The separating cylinder has a first cylinder cavity and a second cylinder cavity. The first cylinder cavity and the second cylinder cavity are communicated through water passing holes. The post-filter element assembly is arranged in the first cylinder cavity. The water inlet side of the post-filter element assembly is communicated with the first water inlet, and the water outlet side of the post-filter element assembly is communicated with the first water outlet. The airbag assembly includes a mounting cover and an elastic member. The mounting cover and the elastic member enclose to form a compressed air cavity. The mounting cover covers the mouth of the second cylinder cavity, and the elastic member is arranged in the second cylinder cavity. Wherein, a convex portion is arranged on the side of the elastic member facing the bottom of the second cylinder cavity.

[0016] The technical solution of the present utility model is that the airbag assembly includes a mounting cover and an elastic member. The mounting cover and the elastic member enclose a compressed air chamber. The mounting cover covers the opening of the second cylinder chamber, and the elastic member is arranged in the second cylinder chamber. By providing a convex portion on the side of the elastic member facing the bottom of the second cylinder chamber, that is, by providing a convex portion on the surface of the elastic member that will be first impacted and squeezed by the water flow, when the surface of the elastic member is impacted and squeezed by the water flow and deformed, elastic deformation will first occur near the convex portion, and then deformation will start from the convex portion and spread around, ensuring that the surface of the elastic member subjected to the impact and squeeze of the water flow is evenly and balancedly stressed, and preventing the situation where local stress on the surface of the elastic member is too large, resulting in elastic deformation and compression in some areas and difficulty in continuing to generate elastic deformation and compression in other areas. Description of the Drawings

[0017] In order to more clearly illustrate the technical solutions in the embodiments of the present utility model or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the following-described drawings are only some embodiments of the present utility model. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on the structures shown in these drawings.

[0018] Figure 1 Structural schematic diagram of an embodiment of the composite filter element provided by the present utility model;

[0019] Figure 2 For Figure 1 Cross-sectional view of the composite filter element in

[0020] Figure 3 For Figure 2 Local enlarged view of part A in

[0021] Figure 4 Cross-sectional view of the partition cylinder of the present utility model;

[0022] Figure 5 Structural schematic diagram of an embodiment of the airbag assembly of the present utility model;

[0023] Figure 6 For Figure 5 Exploded view of the airbag assembly in

[0024] Explanation of the reference numerals in the drawings:

[0025] 10. Composite filter element;

[0026] 100. Housing; 110. Filter bottle; 111. First water inlet; 112. First water outlet; 113. Second water inlet; 114. Second water outlet; 120. End cover;

[0027] 200, separation cylinder; 210, separation plate; 210a, water hole; 220, first cylinder; 220a, first cylinder cavity; 230, second cylinder; 230a, second cylinder cavity;

[0028] 300, post filter element assembly;

[0029] 400, airbag assembly; 410, mounting cover; 411, mounting groove; 420, elastic member; 421, connecting portion; 422, deformation portion; 422a, pleated section; 423, raised portion; 430, compressed air chamber;

[0030] 500. Pre-filter element assembly.

[0031] The realization of the purpose, functional features and advantages of the utility model will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0032] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only 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.

[0033] It should be noted that if the embodiments of the present invention involve directional indications (such as up, down, left, right, front, back...), the directional indications are only used to explain the relative position relationship, movement status, etc. between the components in a certain specific posture. If the specific posture changes, the directional indications will also change accordingly.

[0034] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the utility model, the descriptions of "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of technical features indicated. Therefore, the features limited to "first" and "second" may explicitly or implicitly include at least one of the features. In addition, if "and / or" or "and / or" appears in the full text, its meaning includes three parallel solutions. Taking "A and / or B" as an example, it includes solution A, solution B, or solutions that satisfy both A and B. In addition, the technical solutions between the various embodiments can be combined with each other, but it must be based on the ability of ordinary technicians in this field to implement. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such combination of technical solutions does not exist and is not within the scope of protection required by the utility model.

[0035] The solution-diffusion theory holds that reverse osmosis membranes / nanofiltration membranes are pore-free and integral membranes. Both water molecules and solutes such as salts can dissolve in the membrane. Under the action of external pressure, the water molecules and solute molecules dissolved in the membrane will diffuse to the other side of the reverse osmosis membrane / nanofiltration membrane, but the diffusion rates are different. In existing water purification equipment, during normal water production, the diffusion rate of water molecules under external pressure is much greater than that of solute molecules. Therefore, water molecules will quickly pass through the reverse osmosis membrane / nanofiltration membrane, and most solute molecules will accumulate on the raw water side, thus achieving the separation of solute molecules and water molecules. When the water purification equipment stops operating and stands still for a long time, the concentration of solute molecules on the raw water side is much higher than that on the pure water side. Under the drive of the concentration gradient, solute diffusion will occur, and solute molecules will gradually pass through the reverse osmosis membrane / nanofiltration membrane, and ultimately the water in front of the membrane and the water behind the membrane will reach diffusion equilibrium. This will cause the TDS value of the first cup of pure water to be too high when the water purification equipment is restarted, resulting in low quality of the first cup of pure water and the water quality not meeting the needs of users.

[0036] The aforementioned TDS refers to Total Dissolved Solids (English: Total dissolved solids, abbreviated as TDS), also known as the total amount of dissolved solids, and the measurement unit is milligrams per liter (mg / L). It indicates how many milligrams of dissolved solids are dissolved in 1 liter of water. The higher the TDS value, the more dissolved substances the water contains.

[0037] In related technologies, an airbag component is provided inside the housing of a composite filter element. When high-pressure water enters the housing, the high-pressure water flow will squeeze the airbag component to cause its elastic deformation, thereby compressing the enclosed chamber inside the airbag component. When the composite filter element stops working, that is, when the booster pump stops applying pressure to the water flow, the airbag component will return to its initial state to squeeze the pure water inside the housing to flow reversely into the filter element, reducing the proportion of wastewater in the filter element, improving the taste of the first cup of water when the water purification equipment is restarted, and meeting the user's requirements for water quality. However, for the airbag component in the existing technology, the surface thereof that is impacted and squeezed by the water flow is uneven and unbalanced in force, and there is a possibility of excessive local force on the surface, resulting in elastic deformation and compression of some regions on the surface of the airbag component, and some regions being restricted and difficult to continue to generate elastic deformation and compression, thus affecting the deformation effect of the airbag component and causing the airbag component to fail, making it difficult to achieve the effect of reducing the TDS value of the first cup of pure water when the water purification equipment is restarted and improving the taste of the first cup of water of the water purification equipment.

[0038] In view of this, the present utility model proposes a composite filter element for installation in a water purification equipment to solve the problem that the surface of the airbag component in the existing technology is uneven and unbalanced in force when impacted and squeezed by the water flow, reduce the TDS value of the first cup of water when the water purification equipment is restarted, make the water quality meet the user's requirements, and enable the user to experience a better taste of the first cup of water. Among them, the water purification equipment is a water dispenser, a drinking fountain or a pure water machine.

[0039] Please refer to Figures 1 to 3 In an embodiment of the present utility model, the composite filter element 10 includes a housing 100, a partition cylinder 200, a post-filter element assembly 300, and an airbag assembly 400; the housing 100 is provided with a first water inlet 111 and a first water outlet 112; the partition cylinder 200 is disposed inside the housing 100, the partition cylinder 200 has a first cylinder cavity 220a and a second cylinder cavity 230a, and the first cylinder cavity 220a and the second cylinder cavity 230a are communicated through a water passing hole 210a; the post-filter element assembly 300 is disposed in the first cylinder cavity 220a, the water inlet side of the post-filter element assembly 300 is communicated with the first water inlet 111, and the water outlet side of the post-filter element assembly 300 is communicated with the first water outlet 112; the airbag assembly 400 includes a mounting cover 410 and an elastic member 420, and the mounting cover 410 and the elastic member 420 enclose a compressed air cavity 430; the mounting cover 410 covers the opening of the second cylinder cavity 230a, and the elastic member 420 is disposed in the second cylinder cavity 230a; wherein, a convex portion 423 is provided on the side of the elastic member 420 facing the bottom of the second cylinder cavity 230a.

[0040] Specifically, please refer to Figure 1 and Figure 2 The housing 100 includes a filter bottle 110 and an end cap 120. An accommodation cavity for installing a central pipe and a filter element assembly is formed inside the filter bottle 110. The filter bottle 110 is generally arranged in a cylindrical shape, and one end thereof is open for installing structures such as the post-filter element assembly 300, the partition cylinder 200, and the airbag assembly 400 into the accommodation cavity through the opening. The end cap 120 covers the opening of the filter bottle 110, and the two can be connected by a rotational welding technique, that is, by frictionally generating heat between plastic workpieces through spin fusion plastic welding, melting the contact surface, and relying on external pressure and driving to rotate and solidify the workpieces into one body to ensure the sealing of the compressed air cavity 430 and prevent water leakage.

[0041] Both the first water inlet 111 and the first water outlet 112 are provided on the same side of the filter bottle 110, which is convenient for connection with other pipelines or water circuit boards. Among them, the first water inlet 111 is used for the water to be filtered to flow into the housing 100 for filtration, and the first water outlet 112 is used for the purified water filtered by the post-filter element assembly 300 to flow out.

[0042] Please refer to Figure 2 and Figure 4The separation cylinder 200 is arranged in the housing 100, and has two cylinder chambers, and the two cylinder chambers are connected through the water hole 210a, wherein the post-filter element assembly 300 is arranged in the first cylinder chamber 220a, and the airbag assembly 400 is arranged in the second cylinder chamber 230a. The water flowing into the housing 100 through the first water inlet 111 flows through the post-filter element assembly 300 for filtration, and also flows into the second cylinder chamber 230a through the water hole 210a, compressing the airbag assembly 400 arranged in the second cylinder chamber 230a, and the compressed air formed inside the airbag assembly 400 The cavity 430 is compressed. When the composite filter element 10 stops working, that is, the first water outlet 112 is closed and no water flows out, at this time, in order to restore the pressure balance in the shell 100, the compressed air cavity 430 of the airbag assembly 400 will gradually return to its initial state before compression, so that the pure water in the shell 100 is pressed to the side with high concentration of water ions in the post-filter element assembly 300, thereby reducing the TDS value on the side with higher water ion concentration, and further reducing the TDS value of the first cup of water when the water purification equipment is restarted, so that the water quality meets the needs of users and allows users to experience a better taste of the first cup of water.

[0043] Here, it is also necessary to emphasize that the composite filter element 10 with a post-filter element assembly 300 is usually also provided with a reverse osmosis filter element upstream of its water system. The filtering principle of the reverse osmosis filter element is that raw water enters the reverse osmosis filter element for filtration, and the filtered water is divided into two paths, one is wastewater and the other is pure water. The wastewater is directly discharged from the wastewater outlet connected to its wastewater outlet side, and the pure water flows through the pure water flow channel and is discharged from the pure water outlet for direct drinking by the user or flows into the next filter module for re-filtration. The wastewater outlet in the reverse osmosis filter element is in a normally open state (please refer to the prior art for more detailed working principles, which will not be elaborated here). The composite filter element 10 of the present application is provided with a post-filter element assembly 300, and the first water inlet 111 and the first water outlet 112 are respectively connected to the water inlet side and the water outlet side of the post-filter element assembly 300, that is, the water flowing into the housing 100 from the first water inlet 111 in the present application is pure water that has been filtered by the reverse osmosis filter element, and because the wastewater outlet at the reverse osmosis filter element is in a normally open state. Therefore, when the composite filter element 10 stops working, due to the closure of the first water outlet 112, the airbag assembly 400 will push the pure water in the housing 100 back to the reverse osmosis filter element when it is restored to the initial state under pressure, and at this time the wastewater outlet is in an open state, and the pure water flowing into the reverse osmosis filter element in the housing 100 can accurately discharge the high-concentration wastewater in the reverse osmosis filter element, thereby reducing the concentrated water in the reverse osmosis filter element, achieving an ultra-high first cup of water effect, and avoiding the problem of high concentration of the first few cups of pure water when the water purification equipment is restarted. At the same time, since the raw water inside the reverse osmosis filter has been replaced by pure water, the ratio of internal pure water to raw wastewater has been greatly improved, and its concentration after permeation is even lower.

[0044] See also Figure 2 , Figure 5 and Figure 6 The airbag assembly 400 includes a mounting cover 410 and an elastic member 420. The elastic member 420 is a diaphragm that can produce elastic deformation, and its cross section is roughly U-shaped. The mounting cover 410 and the elastic member 420 enclose a closed compressed air cavity 430. The compressed air cavity 430 contains a gas that is insoluble in water. The gas can be air, nitrogen, or an inert gas (extremely difficult to dissolve in water and difficult to be carried away by water flow), etc., and there is no specific restriction on this. When the gas is air, since the airbag assembly 400 does not need to be vacuumed in the closed compressed air cavity 430 formed after assembly, the air exists directly in the compressed air cavity 430; when the gas is nitrogen or an inert gas, the compressed air cavity 430 can be vacuumed after the airbag assembly 400 is assembled, and then the required nitrogen, inert gas or other gas can be filled into the compressed air cavity 430.

[0045] See also Figures 2 to 4 The first barrel cavity 220a and the second barrel cavity 230a both have a barrel bottom and a barrel mouth opposite to the barrel bottom. The post-filter element assembly 300 is installed in the first barrel cavity 220a through the barrel mouth of the first barrel cavity 220a. The airbag assembly 400 is installed in the second barrel cavity 230a through the barrel mouth of the second barrel cavity 230a, and the installation cover 410 covers the barrel mouth of the second barrel cavity 230a. On the one hand, the installation cover 410 can be used to form a sealed compressed air cavity 430 with the elastic member 420, and on the other hand, it can also be used as a barrel cover of the second barrel cavity 230a. One structural member realizes two functions, reducing the use of parts of the composite filter element 10 and reducing costs. The bottom of the first cylinder cavity 220a and the second cylinder cavity 230a can be opposite sides of a connecting plate, and the water hole 210a is opened on the connecting plate, that is, the water hole 210a passes through the bottom of the first cylinder cavity 220a or the bottom of the second cylinder cavity 230a to achieve the connection between the first cylinder cavity 220a and the second cylinder cavity 230a.

[0046] Regarding the connection method of the mounting cover 410 and the elastic member 420, it can be that the mounting cover 410 presses the edge of the elastic member 420 against the edge of the opening of the second cylinder cavity 230a. The edge of the elastic member 420 is located between the opening and the mounting cover 410, and the three achieve a sealed connection. It can also be that the elastic member 420 is directly and sealingly connected to the mounting cover 410, and then the mounting cover 410 is integrally placed over the opening of the second cylinder cavity 230a to achieve connection with the partition cylinder 200, and no specific restrictions are imposed thereon. Among them, when the mounting cover 410 and the opening of the second cylinder cavity 230a are connected, a rotary welding technique can also be used for connection, that is, by friction welding of plastic parts through spin welding to generate heat, melting the contact surface, and relying on external pressure and drive to rotate and solidify the parts into one body to ensure the airbag assembly 400 is airtight and does not leak water, while making the connection relationship between the mounting cover 410 and the partition cylinder 200 more reliable.

[0047] Please refer to Figure 2 and Figure 3It should be emphasized that a protrusion 423 is provided on the side of the elastic member 420 facing the bottom of the second barrel cavity 230a, and the protrusion 423 protrudes from the surface of the elastic member 420 facing the bottom of the second barrel cavity 230a. The edge of the protrusion 423 and the connection between the surface of the elastic member 420 are smoothly transitioned. Since the side of the composite filter element 10 that is mainly subjected to water pressure during operation is the surface of the elastic member 420 facing the bottom of the second cylindrical cavity 230a, the provision of the protrusion 423 can make the elastic member 420 first produce elastic deformation near the protrusion 423 when the side surface is squeezed and deformed by the impact of the water flow, and then deformation begins to occur from the protrusion 423 to the surrounding areas, thereby ensuring that the surface of the elastic member 420 that is squeezed and squeezed by the water flow is evenly and balancedly stressed, and there will be no situation where the local force on the surface of the elastic member 420 is too large, causing elastic deformation and compression in some areas, and some areas are restricted and difficult to continue to produce elastic deformation and compression, thereby further improving the compressibility of the elastic member 420, ensuring that the elastic member 420 has a sufficient deformation amount, and the gas in the compressed air cavity 430 can be fully compressed, so that when the elastic member 420 returns to its initial state, it pushes back the pure water in the shell 100. The force is sufficient to pressurize the pure water in the shell 100 to the side of the post-filter element 300 with a high concentration of water ions, thereby reducing the TDS value on the side with a higher water ion concentration, and further reducing the TDS value of the first cup of water when the water purification equipment is restarted, so that the water quality meets the needs of users and allows users to experience a better taste of the first cup of water; or, the pure water in the shell 100 is pushed back into the reverse osmosis filter element, and the pure water flowing into the reverse osmosis filter element in the shell 100 can accurately discharge the high-concentration wastewater in the reverse osmosis filter element, thereby reducing the concentrated water in the reverse osmosis filter element, achieving an ultra-high first cup of water effect, and avoiding the problem of high concentrations of the first few cups of pure water when the water purification equipment is restarted. Moreover, since the previous raw water has been replaced by pure water on the inside of the reverse osmosis filter element, the ratio of pure water to raw wastewater inside the reverse osmosis filter element is greatly improved, and its concentration after osmosis is even lower.

[0048] The technical solution of the present utility model is that the airbag assembly 400 includes an installation cover 410 and an elastic member 420. The installation cover 410 and the elastic member 420 enclose a compressed air chamber 430. The installation cover 410 covers the opening of the second cylinder chamber 230a, and the elastic member 420 is arranged in the second cylinder chamber 230a. By providing a protrusion 423 on the side of the elastic member 420 facing the bottom of the second cylinder chamber 230a, that is, by providing the protrusion 423 on the surface of the elastic member 420 that will be first impacted and squeezed by the water flow, when the surface of the elastic member 420 is impacted and squeezed by the water flow and deformed, elastic deformation will first occur near the protrusion 423, and then deformation will start to occur from the protrusion 423 to the surrounding areas, ensuring that the surface of the elastic member 420 that is impacted and squeezed by the water flow is evenly and balancedly stressed, and preventing the situation where local stress on the surface of the elastic member 420 is too large, resulting in elastic deformation and compression in some areas and difficulty in continuing to generate elastic deformation and compression in some restricted areas.

[0049] Please refer to Figure 3 , in an embodiment, the protrusion 423 is arranged in the middle of the side of the elastic member 420 facing the bottom of the second cylinder chamber 230a. Specifically, arranging the protrusion 423 in the middle of the side of the elastic member 420 facing the bottom of the second cylinder chamber 230a can make the stress on this side surface more uniform when it is elastically deformed by the impact of the water flow. Further, the protrusion 423 abuts against the bottom of the second cylinder chamber 230a. With such a setting, in order to make the deformation generated during the installation process of the elastic member 420 more uniform, that is, in order to make the elastic member 420 uniformly stressed at each part during the installation process, a protrusion 423 is provided at the top of the elastic member 420. The setting of the protrusion 423 will abut against the bottom of the second cylinder chamber 230a during the installation process of the elastic member 420. While abutting, the protrusion 423 will evenly transmit the force to the elastic member 420, prompting the elastic member 420 to deform more uniformly, reducing the possibility of non-uniform deformation of the elastic member 420 during the installation process or the rebound process, and further ensuring the structural integrity and stability of the elastic member 420.

[0050] Please refer to Figure 3 and Figure 4Furthermore, the water-passing hole 210a penetrates the bottom of the second cylinder cavity 230a and is provided in plurality. The plurality of water-passing holes 210a are provided on the outer periphery of the protrusion 423 and are arranged at intervals along the circumference of the protrusion 423. Specifically, in order to improve the water-passing efficiency, the number of the water-passing holes 210a is provided in plurality, and the plurality of water-passing holes 210a directly penetrate the bottom of the second cylinder cavity 230a and communicate with the first cylinder cavity 220a. Since the protrusion 423 abuts against the bottom of the second cylinder cavity 230a, in order to avoid the water-passing hole 210a and ensure that the water flow can flow from the first cylinder cavity 220a into the second cylinder cavity 230a, the plurality of water-passing holes 210a are provided on the outer periphery of the protrusion 423 and are arranged at intervals along the circumference of the protrusion 423. It should be emphasized that the water hole 210a connects the first barrel cavity 220a and the second barrel cavity 230a. The post-filter element assembly 300 is arranged in the first barrel cavity 220a. The water hole 210a can be connected to the water inlet side of the post-filter element assembly 300, and can also be connected to the water outlet side of the post-filter element assembly 300. There is no specific limitation on this.

[0051] See also Figure 3 , Figure 5 and Figure 6 In one embodiment, the elastic member 420 includes a connecting portion 421 and a deforming portion 422 connected to each other, the mounting cover 410 is provided with a mounting groove 411, the connecting portion 421 is disposed in the mounting groove 411, the deforming portion 422 is disposed in the second barrel cavity 230a, and the mounting cover 410 presses the connecting portion 421 at the barrel mouth of the second barrel cavity 230a; the protrusion 423 is disposed on the deforming portion 422.

[0052] Specifically, the elastic member 420 is composed of two parts, a connecting portion 421 and a deforming portion 422 , which are connected to each other. In this embodiment, the mounting cover 410 seals and presses the elastic member 420 at the barrel opening of the second barrel cavity 230 a . More specifically, the cross-section of the deformation portion 422 is roughly U-shaped, the connecting portion 421 connects the edge of the deformation portion 422, and a mounting groove 411 is provided on the mounting cover 410, and the shape of the mounting groove 411 is adapted to the connecting portion 421. When the mounting cover 410 and the separation cylinder 200 are installed, since the connecting portion 421 is arranged in the mounting groove 411 of the mounting cover 410, the mounting cover 410 directly presses the connecting portion 421 against the cylinder mouth of the second cylinder cavity 230a, and the mounting cover 410 and the cylinder mouth of the second cylinder cavity 230a are connected by rotary welding technology, that is, the plastic workpieces are rubbed against each other to generate heat through rotary melting plastic welding, so that the contact surface is melted, and the workpieces are rotated and solidified into one by relying on external pressure and drive, so as to ensure the sealing of the compressed air cavity 430 and prevent water leakage. When the deformation portion 422 is impacted by the high-pressure water flow, it will generate elastic deformation and compress the gas stored in the compressed gas cavity 430 . The protrusion 423 is disposed on the deformation portion 422 .

[0053] In an embodiment, the ratio range of the diameter of the convex portion 423 to the diameter of the deformation portion 422 is 0.125 - 0.25. Limiting the ratio range of the diameter of the convex portion 423 to the diameter of the deformation portion 422 to 0.125 - 0.25 can prevent the convex portion 423 from being too large or too small, thus affecting the deformation effect of the deformation portion 422.

[0054] Please refer to Figure 3 , Figure 5 and Figure 6 , in an embodiment, the deformation portion 422 is provided with at least two corrugated segments 422a connected along the axial direction of the deformation portion 422. The arrangement of the corrugated segments 422a further improves the deformation effect of the deformation portion 422 when it is impacted by high-pressure water flow, and can better compress the gas in the compression air cavity 430.

[0055] Please refer to Figures 2 to 4 , in an embodiment, the partition cylinder 200 includes a partition plate 210, and a first cylinder 220 and a second cylinder 230 arranged on opposite sides of the partition plate 210. The first cylinder 220 forms a first cylinder cavity 220a, and the second cylinder 230 forms a second cylinder cavity 230a; the water passing hole 210a is provided on the partition plate 210. Specifically, the first cylinder 220 and the second cylinder 230 are respectively connected to opposite sides of the partition plate 210, and the first cylinder 220 forms a first cylinder cavity 220a, and the second cylinder 230 forms a second cylinder cavity 230a. The cross sections of the first cylinder 220 and the second cylinder 230 are both circular, and the water passing hole 210a penetrates the partition plate 210 to realize the communication between the first cylinder cavity 220a and the second cylinder cavity 230a.

[0056] Please refer to Figure 4, Further, the diameter of the first cylinder 220 is smaller than that of the second cylinder 230. The composite filter element 10 further includes a pre-filter element assembly 500, and the pre-filter element assembly 500 is sleeved on the first cylinder 220. Specifically, the pre-filter element assembly 500 can also be arranged in the housing 100, so that the composite filter element 10 integrates the functions of pre-filtration and post-filtration. The composite filter element 10 has a high integration degree and does not require a separate pre-filter assembly to be arranged in the water circuit system. Since the post-filter element assembly 300 is arranged in the first cylinder cavity 220a, in order to prevent the water flow paths of the pre-filter element assembly 500 and the post-filter element assembly 300 in the housing 100 from cross-flowing, the pre-filter element assembly 500 is arranged outside the first cylinder cavity 220a, that is, the pre-filter element assembly 500 is sleeved on the first cylinder 220. And, the diameter of the first cylinder 220 is smaller than that of the second cylinder 230 to reserve an installation position for the pre-filter element assembly 500. On the housing 100, a second water inlet 113 and a second water outlet 114 are also arranged corresponding to the pre-filter element assembly 500. The second water inlet 113 is communicated with the water inlet side of the pre-filter element assembly 500, and the second water outlet 114 is communicated with the water outlet side of the pre-filter element assembly 500.

[0057] Please refer to Figure 5 and Figure 6 , In an embodiment, the cross-section of the convex portion 423 in the radial direction of the partition cylinder 200 is circular. The circular convex portion 423 is convenient for forming and manufacturing.

[0058] Please refer to Figure 3 , In an embodiment, the convex portion 423 is a raised portion on the side of the elastic member 420 facing the bottom of the second cylinder cavity 230a. Specifically, the convex portion 423 is arranged as a raised portion, so that the convex portion 423 has better buffering performance, and the raised portion has strong resistance to deformation, which is beneficial for the surrounding deformation portion 422 of the raised portion to generate elastic deformation when receiving the impact force of the water flow.

[0059] The present utility model also provides a water purification device, which includes the aforementioned composite filter element 10. The specific structure of the composite filter element 10 refers to the above-mentioned embodiments. Since this water purification device adopts all the technical solutions of the above-mentioned embodiments, it has at least all the beneficial effects brought by the technical solutions of the above-mentioned embodiments, which will not be elaborated one by one here. Among them, the composite filter element 10 includes a housing 100, a partition cylinder 200, a post-filter element assembly 300, and an airbag assembly 400; the housing 100 is provided with a first water inlet 111 and a first water outlet 112; the partition cylinder 200 is arranged inside the housing 100, the partition cylinder 200 has a first cylinder cavity 220a and a second cylinder cavity 230a, and the first cylinder cavity 220a and the second cylinder cavity 230a are communicated through a water passing hole 210a; the post-filter element assembly 300 is arranged in the first cylinder cavity 220a, the water inlet side of the post-filter element assembly 300 is communicated with the first water inlet 111, and the water outlet side of the post-filter element assembly 300 is communicated with the first water outlet 112; the airbag assembly 400 includes a mounting cover 410 and an elastic member 420, and the mounting cover 410 and the elastic member 420 enclose a compressed air cavity 430; the mounting cover 410 covers the opening of the second cylinder cavity 230a, and the elastic member 420 is arranged in the second cylinder cavity 230a; wherein, a convex portion 423 is arranged on one side of the elastic member 420 facing the bottom of the second cylinder cavity 230a. The water purification device is a water dispenser, a drinking water machine or a pure water machine.

[0060] The above is only an exemplary embodiment of the present utility model, and does not limit the patent scope of the present utility model. Any equivalent structural transformation made under the technical concept of the present utility model by using the content of the specification and drawings of the present utility model, or any direct / indirect application in other related technical fields is included in the patent protection scope of the present utility model.

Claims

1. A composite filter element, characterized in that, Comprising: A housing provided with a first water inlet and a first water outlet; A partition cylinder disposed within the housing, the partition cylinder having a first cylinder cavity and a second cylinder cavity, the first cylinder cavity and the second cylinder cavity being communicated through water passing holes; A post-filter assembly disposed within the first cylinder cavity, the water inlet side of the post-filter assembly being communicated with the first water inlet, and the water outlet side of the post-filter assembly being communicated with the first water outlet; and An airbag assembly including a mounting cover and an elastic member, the mounting cover and the elastic member enclosing to form a compressed air cavity; The mounting cover covers the opening of the second cylinder cavity, and the elastic member is disposed within the second cylinder cavity; wherein, a convex portion is provided on a side of the elastic member facing the bottom of the second cylinder cavity.

2. The composite filter element according to claim 1, characterized in that, The convex portion is disposed at the middle of a side of the elastic member facing the bottom of the second cylinder cavity.

3. The composite filter element according to claim 2, wherein, The convex portion abuts against the bottom of the second cylinder cavity.

4. The composite filter element according to claim 3, characterized in that, The water passing holes penetrate through the bottom of the second cylinder cavity and are provided in plurality, the plurality of water passing holes are disposed on the outer periphery of the convex portion and are spaced apart circumferentially along the convex portion.

5. The composite filter element according to any one of claims 1 to 4, characterized in that The elastic member includes a connecting portion and a deformable portion connected to each other, the mounting cover is provided with a mounting groove, the connecting portion is disposed within the mounting groove, the deformable portion is disposed within the second cylinder cavity, and the mounting cover presses the connecting portion against the opening of the second cylinder cavity; the convex portion is disposed on the deformable portion.

6. The composite filter element according to claim 5, characterized in that The ratio range of the diameter of the convex portion to the diameter of the deformable portion is 0.125 - 0.

25.

7. The composite filter element according to claim 5, wherein The deformable portion is provided with at least two pleated segments axially connected along the deformable portion.

8. The composite filter element according to any one of claims 1 to 4, characterized in that, The partition cylinder includes a partition plate, and a first cylinder body and a second cylinder body disposed on opposite sides of the partition plate, the first cylinder body forming the first cylinder cavity, and the second cylinder body forming the second cylinder cavity; the water passing holes are provided on the partition plate.

9. The composite filter element according to claim 8, wherein, The diameter of the first cylinder body is smaller than the diameter of the second cylinder body, and the composite filter further includes a pre-filter assembly sleeving the first cylinder body.

10. The composite filter element according to any one of claims 1 to 4, characterized in that, The cross-section of the convex portion in the radial direction of the partition cylinder is circularly arranged.

11. The composite filter element according to any one of claims 1 to 4, characterized in that, The convex portion is a raised portion on a side of the elastic member facing the bottom of the second cylinder cavity.

12. A water purification device, characterized in that, Comprising the composite filter according to any one of claims 1 to 11.

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