Filter capable of preventing water hammer and water purifier comprising same

Abstract

The utility model relates to the field of water purifiers, and discloses a water hammer preventing filter and a water purifier comprising the same, which are characterized in that the filter comprises a shell, a filter element assembly and an elastic air bag, a shell inlet and a shell outlet are arranged at one end of the shell along the axial direction, the filter element assembly is arranged in a cavity of the shell, and the elastic air bag is arranged in the shell. Comprising an outer filter element and an inner filter element which are sequentially arranged and communicated from outside to inside in the radial direction, the air bag is arranged in the cavity and located at the end, away from the inlet of the shell in the axial direction, of the filter element assembly, and an inlet channel is defined among the inner surface of the shell, the outer surface of the filter element assembly and the outer surface of the air bag; and the shell inlet, the inlet channel, the inlet of the outer filter element, the outlet of the inner filter element and the shell outlet are sequentially communicated. The elastic air bag can relieve the pressure of a water hammer, the outer filter element can perform coarse filtration and then perform fine filtration by the inner filter element, and the outer filter element is arranged on the outer side, so that the size can be set to be larger to improve the filtering efficiency, and the service life of the filter is prolonged.

Description

TECHNICAL FIELD

[0001] The utility model relates to water purifier field especially relates to a filter of preventing water hammer. BACKGROUND

[0002] The existing water purifier is prone to water leakage accident, the main reason is that the shell of filter in water purifier appears crack after water hammer impact for many years and leads to water seepage, finally, the shell is broken under the pressure of water hammer, leading to large area water seepage, so that the service life of water purifier is low. SUMMARY

[0003] The utility model solves the technical problem that the service life of filter in water purifier is low in prior art, and provides a filter of preventing water hammer and a water purifier comprising the same.

[0004] The utility model solves the above technical problem through the following technical scheme:

[0005] A filter of preventing water hammer, the filter comprises:

[0006] A shell has a cavity inside, and the shell is provided with a shell inlet and a shell outlet which are communicated with the outside of the shell at one end of the filter along the axial direction;

[0007] A filter core assembly is arranged in the cavity and comprises an outer filter core and an inner filter core which are sequentially sleeved along the radial direction of the filter and are sequentially communicated;

[0008] An elastic air bag is arranged in the cavity and is located at one end of the filter core assembly away from the shell inlet along the axial direction;

[0009] An entering channel is defined between the inner surface of the shell, the outer surface of the filter core assembly and the outer surface of the air bag, and the shell inlet, the entering channel, the inlet of the outer filter core, the outlet of the inner filter core and the shell outlet are sequentially communicated.

[0010] In the scheme, the elastic air bag is arranged at one end of the filter core assembly away from the shell inlet and the shell outlet along the axial direction, and the outer surface of the air bag participates in defining the entering channel, liquid fluid cannot be compressed after entering the shell inlet during the use of the filter, the air bag is elastic, and the gas in the air bag is compressible, so that the water hammer pressure is buffered, thereby reducing the risk of breakage of the shell caused by the water hammer pressure and improving the service life of the filter.

[0011] The outer filter element and the inner filter element are communicated in series, the filter element assembly takes in liquid from the outer filter element and discharges liquid from the inner filter element, the outer filter element can be used for rough filtration, and the inner filter element can be used for fine filtration; the outer filter element and the inner filter element are arranged in the radial direction from outside to inside in sequence, so that the volume of the outer filter element on the outer side in the radial direction can be set to be larger, the efficiency of rough filtration is improved, and the service life of the filter is prolonged.

[0012] Preferably, the filter element assembly further comprises an intermediate filter element arranged between the outer filter element and the inner filter element in the radial direction, and the outer filter element, the intermediate filter element and the inner filter element are sequentially connected in series.

[0013] Preferably, the filtering precision of the outer filter element is between 10 and 20 um, the filtering precision of the intermediate filter element is between 3 and 5 um, and the inner filter element adopts an adsorption filter element.

[0014] Preferably, the outer filter element adopts a folded polypropylene filter element, the intermediate filter element adopts a polypropylene melt-blown filter element, and the inner filter element adopts a carbon rod filter element.

[0015] Preferably, the filter element assembly further comprises two filter element covers arranged at two ends of the outer filter element in the axial direction, respectively, and at least two ends of the outer filter element in the axial direction are sealed and positioned in the shell.

[0016] Preferably, the filter element cover comprises a filter element cover extension one extending in the radial direction, a filter element cover extension two and a filter element cover extension three arranged in the radial direction from outside to inside in sequence and extending from the filter element cover extension one towards the other filter element cover in the axial direction in a ring shape, the outer filter element and the intermediate filter element are arranged in the axial direction between the filter element cover extension one of the two filter element covers, the outer filter element is arranged in the radial direction between the filter element cover extension two and the filter element cover extension three, the intermediate filter element is arranged in the radial direction in the filter element cover extension two, and the outer filter element and the intermediate filter element are positioned relative to the shell through the two filter element covers.

[0017] Preferably, at least one filter element cover is provided with a positioning portion on the outer side in the radial direction, and the positioning portion and the inner side of the shell abut in the radial direction.

[0018] Preferably, the filter further comprises:

[0019] A mounting pipe, the outer filter element, the intermediate filter element, the mounting pipe and the inner filter element are sequentially sleeved in the radial direction from outside to inside, and the mounting pipe is provided with an opening communicating with the outlet of the intermediate filter element and the inlet of the inner filter element.

[0020] The inner cover one and the inner cover two are arranged in sequence along the axial direction towards the air bag, and seal the two ends of the inner filter element along the axial direction.

[0021] The mounting pipe is sealedly connected with the inner cover two at the end close to the air bag along the axial direction, and sealedly connected with the shell at the end close to the shell inlet along the axial direction, so as to seally isolate the inside of the mounting pipe from the entering channel.

[0022] Preferably, the filter further comprises:

[0023] The mounting pipe, the outer filter element, the mounting pipe and the inner filter element are arranged in sequence along the radial direction from outside to inside, and the mounting pipe is provided with an opening communicating with the outlet of the outer filter element and the inlet of the inner filter element.

[0024] The inner cover one is arranged in the mounting pipe along the radial direction and located at the end of the inner filter element close to the shell inlet along the axial direction.

[0025] The inner cover two is arranged between the end of the filter element assembly close to the air bag and the end of the shell close to the air bag along the axial direction.

[0026] The inner cover one and the inner cover two seal the two ends of the inner filter element along the axial direction.

[0027] The mounting pipe is sealedly connected with the inner cover two at the end close to the air bag along the axial direction, and sealedly connected with the shell at the end close to the shell inlet along the axial direction, so as to seally isolate the inside of the mounting pipe from the entering channel.

[0028] Preferably, the mounting pipe has a mounting pipe extension one extending along the axial direction in a tubular shape and arranged between the outer filter element and the inner filter element, and has a mounting pipe extension two located at the end of the inner cover one away from the inner filter element along the axial direction, extending inwardly along the radial direction from the mounting pipe extension one, having an opening, and the inner cover one is inserted into the opening of the mounting pipe extension two, and the inserted part has an opening, the inner filter element is communicated with the shell outlet through the opening of the inner cover one, and a sealing element is arranged between the surfaces of the inner cover one and the mounting pipe extension one facing each other.

[0029] Preferably, the mounting pipe has a mounting pipe extension one extending along the axial direction, in a tubular shape, arranged between the outer filter element and the inner filter element; the inner cover two has an inner cover two extension one extending along the radial direction and located at an end of the inner filter element away from the housing inlet along the axial direction, and an inner cover two extension two and an inner cover two extension three connected with the inner cover two extension one, in an annular shape, sequentially sleeved along the radial direction from outside to inside and extending along the axial direction, the inner cover two extension two is sealingly connected with the mounting pipe extension one, and the inner filter element is arranged in the inner cover two extension three.

[0030] Preferably, the air bag is annular, and the filter further comprises an inner cover two arranged in the cavity, the inner cover two is mounted between an end of the filter element assembly close to the air bag and an end of the housing close to the air bag along the axial direction, and the air bag is sleeved outside the inner cover two along the radial direction.

[0031] Preferably, the housing inlet and the housing outlet are each provided with an electromagnetic valve for controlling opening and closing.

[0032] Preferably, the housing comprises a housing body and a housing end cover, the housing inlet and the housing outlet are arranged on the housing body, and the housing end cover covers an end of the housing body away from the housing inlet along the axial direction, and the housing end cover and the housing body together define the cavity.

[0033] A water purifier comprising the filter for preventing water hammer according to any one of the above technical solutions, the housing inlet is an inlet of the water purifier or communicates with the inlet of the water purifier, and the housing outlet is an outlet of the water purifier or communicates with the outlet of the water purifier.

[0034] The positive progress effect of the utility model lies in:

[0035] The outer filter element and the inner filter element are sequentially communicated to form series connection, the filter element assembly takes in water from the outer filter element and discharges water from the inner filter element, the outer filter element can be used for rough filtration, and the inner filter element can be used for further filtration; by sequentially arranging the outer filter element and the inner filter element along the radial direction from outside to inside, the volume of the outer filter element on the radial outer side can be set larger, so that the efficiency of rough filtration is improved, and the service life of the filter is improved.

[0036] By arranging the elastic air bag at an end of the filter element assembly away from the housing inlet and the housing outlet along the axial direction, and arranging the outer surface of the air bag to participate in defining the inlet channel, in the use process of the filter, water is incompressible after entering from the housing inlet, the air bag is elastic, and the gas in the air bag is compressible, the water hammer pressure first compresses the air bag, so that the water hammer pressure is buffered, and water will flow out from the housing outlet only when the air bag is squeezed to the limit, so that the risk of rupture of the housing caused by the water hammer pressure is reduced, and the service life of the filter is improved. Attached Figure Description

[0037] Figure 1 This is an external schematic diagram of the filter;

[0038] Figure 2 This is a schematic diagram of the internal structure of the filter;

[0039] Figure 3 This is a schematic diagram of the external filter element;

[0040] Figure 4 This is a cross-sectional view of the filter;

[0041] Figure 5 for Figure 4 Partial schematic diagram;

[0042] Figure 6 This is a schematic diagram of the fluid flow path inside the filter.

[0043] Explanation of reference numerals in the attached figures:

[0044] Filter 1000;

[0045] 1. Housing body 11. Housing inlet 111. Housing outlet 112. Mounting part 113. Housing end cover 12;

[0046] External filter element 21, intermediate filter element 22, internal filter element 23;

[0047] Filter element cover 24, filter element cover one 241, filter element cover two 242;

[0048] Filter cover extension 1 251, filter cover extension 2 252, filter cover extension 3 253, filter cover extension 4 254, positioning part 255;

[0049] Airbag 3;

[0050] Installation pipe 4, installation pipe extension 1 41, installation pipe extension 2 42;

[0051] 5. Inner cover 1; 51. Extension 1 of inner cover 1; 52. Extension 2 of inner cover 1; 53. Extension 3 of inner cover 1;

[0052] 6. Inner cover 2; 61. Extension 1 of inner cover 2; 62. Extension 2 of inner cover 2; 63. Extension 3 of inner cover 2;

[0053] Enter Channel 7. Detailed Implementation

[0054] The present invention will be further illustrated by way of embodiments below, but the present invention is not limited to the scope of the embodiments described herein.

[0055] The embodiment provides a filter 1000 for filtering water, Figures 1-6 The embodiment provides a filter 1000 for filtering water,

[0056] For the convenience of description, the axial direction of the filter 1000 is defined as the L direction, Figure 4 The direction from below to above along the L direction is the L1 direction, and the direction from above to below is the L2 direction, where above and below only refer to the relative position of the filter 1000, Figure 4 The schematic direction is not used to limit the actual position of the filter 1000; the radial direction of the filter 1000 is defined as the R direction, the direction from outside to inside along the radial direction is the R1 direction, and the direction from inside to outside along the radial direction is the R2 direction, see Figure 4 .

[0057] As Figures 1-5 , the filter 1000 comprises:

[0058] A shell 1, the shell 1 has a cavity inside, and the shell 1 also has a shell inlet 111 and a shell outlet 112, the shell inlet 111 and the shell outlet 112 are in communication with the outside of the shell 1, and are arranged at one end of the shell 1 along the L1 direction;

[0059] A filter core assembly arranged in the cavity of the shell 1, comprising an outer filter core 21 and an inner filter core 23, the outer filter core 21 and the inner filter core 23 are sequentially arranged and sequentially communicated along the R1 direction, forming a series connection;

[0060] An air bag 3 having elasticity, arranged in the cavity of the shell 1, located at one end of the filter core assembly along the L2 direction;

[0061] An entering channel 7 is defined between the inner surface of the shell 1, the outer surface of the filter core assembly and the outer surface of the air bag 3, the shell inlet 111, the entering channel 7, the inlet of the outer filter core 21, the outlet of the inner filter core 23 and the shell outlet 112 are sequentially communicated, Figure 6 The water flow path in the filter 1000 is schematically shown by the dotted line with arrows.

[0062] The outer filter core 21 and the inner filter core 23 are sequentially communicated to form a series connection, the filter core assembly enters water from the outer filter core 21 and discharges water from the inner filter core 23, the outer filter core 21 can be used for rough filtration, and the inner filter core 23 can be used for further filtration; the outer filter core 21 and the inner filter core 23 are sequentially arranged from outside to inside along the radial direction, so that the volume of the outer filter core 21 on the outer side along the radial direction is set to be larger, so as to improve the rough filtration efficiency, thereby prolonging the service life of the filter 1000.

[0063] By setting the elastic air bag 3 at the end of the filter element assembly away from the shell inlet 111, the shell outlet 112 in the axial direction, and the outer surface of the air bag 3 participating in defining the inlet channel 7, after the water enters from the shell inlet 111 during the use of the filter 1000, the water is incompressible, the air bag 3 is elastic, and the gas inside the air bag 3 is compressible. The water hammer pressure first compresses the air bag 3, so that the water hammer pressure is buffered, and the water will only flow out from the shell outlet 112 when the air bag 3 is squeezed to the limit, thereby reducing the risk of the shell 1 being broken due to water hammer pressure and improving the service life of the filter 1000.

[0064] The electromagnetic valve control opening and closing is arranged at the shell inlet 111 and the shell outlet 112. When it is detected that the water taking action is cancelled, the electromagnetic valve at the shell outlet 112 can be controlled to close later than the electromagnetic valve at the shell inlet 111 for several seconds, for example, 1-3 seconds. In this way, when the electromagnetic valve at the shell inlet 111 is closed, the water in the filter 1000 will continue to flow out at this time because the electromagnetic valve at the shell outlet 112 has not been closed, and the air bag 3 needs to be decompressed at this time. The air bag 3 returns to the state before being squeezed. The above action is repeated. In this way, the water hammer pressure in the tap water is completely absorbed by the air bag 3, greatly reducing the pressure bearing of the shell 1, thereby prolonging the service life of the shell 1.

[0065] As Figure 4 , Figure 5 , the shell 1 includes a shell body 11 and a shell end cover 12. The shell inlet 111 and the shell outlet 112 are arranged on the shell body 11, and the shell end cover 12 is arranged at one end of the shell body 11 in the L2 direction and defines a cavity together with the shell body 11. By arranging the shell end cover 12 at one end of the shell body 11 in the L2 direction close to the air bag 3, the filter element assembly can be installed in the shell body 11 first and then the air bag 3 is installed, avoiding the influence of the elastic deformation of the air bag 3 on the installation and positioning of the filter element assembly during the installation process. Specifically, Figure 5 , the shell body 11 is provided with an annular groove, and the shell end cover 12 is provided with an annular boss. The annular boss is inserted into the annular groove to facilitate positioning and facilitate the fusion sealing of the shell end cover 12 and the shell body 11 at the annular boss.

[0066] As Figure 4 , Figure 5, the filter core assembly further comprises an intermediate filter core 22, the outer filter core 21, the intermediate filter core 22 and the inner filter core 23 are sequentially arranged along the R1 direction and are sequentially connected in series to filter water in three stages. The outer filter core 21 adopts a folded polypropylene filter core, which is similar to a paper structure folded in positive and negative directions, and is simply referred to as a folded PP. The filtering precision is between 10 and 20 um, and the outer filter core 21 performs rough filtration. The intermediate filter core 22 adopts a polypropylene melt-blown filter core, which is simply referred to as a PP. The filtering precision is between 3 and 5 um, and the intermediate filter core 22 further filters the water filtered by the outer filter core 21. The third-stage filter core adopts a carbon rod filter core with adsorption and filtration effects, further adsorbs and filters the water filtered by the intermediate filter core 22, and improves the taste of the water at the water outlet.

[0067] As shown in Figure 4 , Figure 5 , the filter core assembly further comprises two filter core covers 24, namely a first filter core cover 241 and a second filter core cover 242, which are arranged at one end of the outer filter core 21 and the intermediate filter core 22 along the L1 direction and the L2 direction respectively. The two ends of the outer filter core 21 and the intermediate filter core 22 along the L direction are sealed, and the outer filter core 21 and the intermediate filter core 22 are positioned in the shell 1 through the two filter core covers 24.

[0068] Specifically, the two filter core covers 24 each have:

[0069] a first filter core cover extension 251 arranged along the R direction;

[0070] a second filter core cover extension 252 and a third filter core cover extension 253, which are annular structures. The second filter core cover extension 252 and the third filter core cover extension 253 on one filter core cover 24 are arranged along the L direction towards the other filter core cover 24. The second filter core cover extension 252 is arranged outside the third filter core cover extension 253 along the R direction.

[0071] The two filter core covers 24 are respectively mounted on the shell 1. The outer filter core 21 and the intermediate filter core 22 are mounted between the first filter core cover extensions 251 of the two filter core covers 24 along the L direction. The outer filter core 21 is mounted between the second filter core cover extension 252 and the third filter core cover extension 253 along the R direction. The intermediate filter core 22 is mounted in the second filter core cover extension 252 along the radial direction. The outer filter core 21 and the intermediate filter core 22 are fixed on the two filter core covers 24 by hot melt adhesive sealing.

[0072] In other embodiments, the intermediate filter core 22 can not be arranged, and correspondingly, the second filter core cover extension 252 or the third filter core cover extension 253 can not be arranged.

[0073] As shown in Figure 4 , Figure 5, the filter 1000 further comprises a mounting pipe 4, the mounting pipe 4 has a mounting pipe extension one 41 extending along the L direction and in a ring shape, the outer filter element 21, the intermediate filter element 22, the mounting pipe extension one 41, the inner filter element 23 are sequentially sleeved along the R1 direction, the mounting pipe 4 is provided with openings for communicating the outlet of the intermediate filter element 22 and the inlet of the inner filter element 23, and openings for communicating the outlet of the inner filter element 23 and the shell outlet 112.

[0074] As Figure 3 , as Figure 5 , the filter 1000 further comprises an inner cover one 5 and an inner cover two 6, which are respectively arranged at one end of the inner filter element 23 along the L1 direction and the L2 direction, seal the end of the inner filter element 23, and the inner filter element 23 is positioned in the shell 1 through the inner cover one 5 and the inner cover two 6. The end of the mounting pipe 4 along the L2 direction is sealingly connected with the inner cover two 6, and the end along the L1 direction is inserted into the mounting portion 113 of the shell body 11 and sealed by a sealing ring, so that the inside of the mounting pipe 4 and the inlet channel 7 are sealingly isolated. The mounting portion 113 sequentially isolates a water inlet space and a water outlet space in the shell 1 along the R1 direction, the water inlet space is used to form the inlet channel 7, and the water outlet space is used to communicate the shell outlet 112 and the outlet of the inner filter element 23.

[0075] As Figure 4 , Figure 5 , the mounting pipe 4 has:

[0076] The mounting pipe extension one 41 extends along the L direction and is in a tubular shape, and is sleeved between the intermediate filter element 22 and the inner filter element 23 along the R direction;

[0077] The mounting pipe extension two 42 is located at one end of the inner cover one 5 along the L1 direction, extends from the mounting pipe extension one 41 along the R1 direction, and has an opening on the inner side.

[0078] As Figure 4 , Figure 5 , the inner cover one 5 has:

[0079] The inner cover one extension one 51 extends along the R direction and has an opening on the inner side;

[0080] The inner cover one extension two 52 extends from the outer side of the inner cover one extension one 51 along the L2 direction;

[0081] The inner cover one extension three 53 extends from the inner side opening of the inner cover one extension one 51 along the L1 direction.

[0082] As Figure 4 , Figure 5 , the inner cover two 6 has:

[0083] The inner cover two extension one 61 extends along the R direction and is located at one end of the inner filter element 23 along the L2 direction;

[0084] The second extension of the inner cover, 62 and the third extension of the inner cover, are connected to the first extension of the inner cover, 61, and are arranged in a ring shape. They are sequentially fitted along the R1 direction and extend along the L1 direction.

[0085] like Figure 4 , Figure 5 One end of the mounting tube extension 41 along the L1 direction is inserted into the mounting part 113 and abuts against the housing body 11 along the L direction, forming a seal with the mounting part 113 through a sealing ring; one end of the mounting tube extension 41 along the L2 direction is sealed to the inner cover extension 62, and the inner cover extension 62 abuts against the housing end cover 12 along the L direction; thus achieving the sealing of the inner side of the mounting tube extension 4 relative to the entry channel 7, and positioning of the mounting tube 4 and the inner cover 6 along the R and L directions.

[0086] like Figure 4 , Figure 5 The filter element cover 241 is provided with a filter element cover extension 254, which extends along the L1 direction. The filter element cover extension 254 of the filter element cover 241 and the filter element cover extension 251 of the filter element cover 242 are sealed and fitted on the outside of the mounting tube 4, so as to achieve the positioning of the two filter element covers 24, the outer filter element 21, and the middle filter element 22 along the R direction. The sealing ring provided on the outside of the mounting tube 4 is used to seal and isolate the interior of the filter element assembly relative to the entry channel 7.

[0087] like Figure 2 The filter element cover 241 has a positioning part 255 on the outer side along the R direction. The positioning part 255 and the inner side of the housing 1 are pressed together along the R direction. This can prevent the filter element assembly from shaking inside the housing 1 and causing poor sealing. It can also increase the water pressure resistance of the entire housing 1 and prevent it from cracking when subjected to water pressure.

[0088] like Figure 4 , Figure 5 One end of the inner filter element 23 along the L1 direction is sealed and installed in the inner cover extension 52. The inner cover 5 is inserted into the mounting tube extension 41 along the L1 direction and sealed by a sealing ring, so that the inner cover extension 53 is inserted into the opening of the mounting tube extension 42. The inner cover extension 51 abuts against the mounting tube extension 42 along the L direction, thereby positioning one end of the inner filter element 23 along the L1 direction relative to the housing 1.

[0089] like Figure 4 , Figure 5 The inner cover second extension 63 is sealed and fitted on the outside of one end of the inner filter element 23 along the L2 direction. One end of the inner cover second extension 62 along the L2 direction and the end cover 12 of the housing along the L direction are pressed together to achieve the positioning of one end of the inner filter element 23 along the L2 direction relative to the housing 1.

[0090] The airbag 3 can be made of polypropylene, which is elastic and easy to clean. For example...Figure 4 、 Figure 5 The air bag 3 is annular, has a long waist-shaped cross section, and is filled with clean air. The air bag 3 is radially sleeved outside the inner cover two 6, is axially located between the filter element cover two 242 and the shell end cover 12, and achieves the limiting of the air bag 3 in the shell 1.

[0091] The filter 1000 of the utility model is used in a water purifier, and the inlet of the water purifier, the shell inlet 111, the shell outlet 112, and the outlet of the water purifier are sequentially communicated; the shell inlet 111 can also be used as the inlet of the water purifier, and / or the shell outlet 112 can be used as the outlet of the water purifier, so that the service life of the water purifier is improved.

[0092] Although the specific embodiments of the utility model are described above, those skilled in the art should understand that this is only an example, and the protection scope of the utility model is defined by the appended claims. Those skilled in the art can make various changes or modifications to these embodiments without departing from the principles and essence of the utility model, and these changes and modifications all fall within the protection scope of the utility model.

Claims

1. A filter for preventing water hammer, characterized by, The filter comprises: a shell with a cavity inside, the shell being provided with a shell inlet and a shell outlet communicating with the outside of the shell at one end of the filter in the axial direction; a filter core assembly arranged in the cavity, comprising an outer filter core, an inner filter core, which are sequentially sleeved and communicated in the radial direction of the filter; a flexible air bag arranged in the cavity, located at one end of the filter core assembly away from the shell inlet in the axial direction; an entering channel is defined between the inner surface of the shell, the outer surface of the filter core assembly and the outer surface of the air bag, and the shell inlet, the entering channel, the inlet of the outer filter core, the outlet of the inner filter core and the shell outlet are sequentially communicated.

2. The filter to prevent water hammer according to claim 1, wherein The filter core assembly further comprises an intermediate filter core arranged between the outer filter core and the inner filter core in the radial direction, and the outer filter core, the intermediate filter core and the inner filter core are sequentially connected in series.

3. The filter to prevent water hammer as claimed in claim 2, wherein, The outer filter core adopts a folded polypropylene filter core, the intermediate filter core adopts a polypropylene melt-blown filter core, and the inner filter core adopts a carbon rod filter core. And / or, the filter core assembly further comprises two filter core covers, which are arranged at two ends of the outer filter core in the axial direction respectively, and at least seal the two ends of the outer filter core in the axial direction and position the outer filter core in the shell.

4. The filter to prevent water hammer as defined in claim 3, wherein The filter core cover comprises a filter core cover extension one extending in the radial direction, a filter core cover extension two and a filter core cover extension three which are sequentially arranged from outside to inside in the radial direction and extend from the filter core cover extension one towards the other filter core cover in the axial direction in a ring shape, the outer filter core and the intermediate filter core are installed between the filter core cover extension ones of the two filter core covers in the axial direction, the outer filter core is installed between the filter core cover extension two and the filter core cover extension three in the radial direction, the intermediate filter core is installed in the filter core cover extension two in the radial direction, and the outer filter core and the intermediate filter core are positioned relative to the shell through the two filter core covers. And / or, at least one of the filter core covers is provided with a positioning portion on the outside in the radial direction, and the positioning portion and the inside of the shell abut in the radial direction.

5. The filter to prevent water hammer as claimed in claim 4, wherein, The filter further comprises: a mounting tube, the outer filter core, the intermediate filter core, the mounting tube and the inner filter core are sequentially sleeved from outside to inside in the radial direction, and the mounting tube is provided with an opening communicating with the outlet of the intermediate filter core and the inlet of the inner filter core; an inner cover one and an inner cover two, which are sequentially arranged in the axial direction towards the air bag and are located at two ends of the inner filter core in the axial direction, and seal the two ends of the inner filter core in the axial direction; one end of the mounting tube close to the air bag in the axial direction is sealingly connected with the inner cover two, and one end of the mounting tube close to the shell inlet in the axial direction is sealingly connected with the shell, so that the inside of the mounting tube and the entering channel are sealingly isolated.

6. The filter to prevent water hammer as defined in claim 1, wherein The filter further comprises: a mounting tube, the outer filter core, the mounting tube and the inner filter core are sequentially sleeved from outside to inside in the radial direction, and the mounting tube is provided with an opening communicating with the outlet of the outer filter core and the inlet of the inner filter core; an inner cover one arranged in the mounting tube in the radial direction and located at one end of the inner filter core close to the shell inlet in the axial direction; the inner cover two is arranged between the filter element assembly close to the air bag and the shell close to the air bag along the axial direction; the inner cover one and the inner cover two seal the two ends of the inner filter element along the axial direction; the mounting pipe is sealed with the inner cover two close to the air bag along the axial direction, and is sealed with the shell close to the shell inlet along the axial direction, so that the inside of the mounting pipe is sealed from the inlet channel.

7. The filter to prevent water hammer as defined in claim 6, wherein the mounting pipe has a mounting pipe extension one which is tubular and arranged between the outer filter element and the inner filter element along the axial direction; the mounting pipe further has a mounting pipe extension two which is located at the end of the inner cover one away from the inner filter element along the axial direction, extends inwardly from the mounting pipe extension one along the radial direction, has an opening, the inner cover one is inserted into the opening of the mounting pipe extension two, the inserted part has an opening, the inner filter element is communicated with the shell outlet through the opening of the inner cover one, and a sealing element is arranged between the surfaces of the inner cover one and the mounting pipe extension one; and / or the inner cover two has an inner cover two extension one which extends along the radial direction and is located at the end of the inner filter element away from the shell inlet along the axial direction, and an inner cover two extension two and an inner cover two extension three which are annular, are sequentially sleeved from outside to inside along the radial direction and extend along the axial direction, the inner cover two extension two is sealed with the mounting pipe extension one, and the inner filter element is arranged in the inner cover two extension three.

8. The filter to prevent water hammer of claim 1, wherein, the air bag is annular, and the filter further comprises an inner cover two arranged in the cavity, the inner cover two is arranged between the filter element assembly close to the air bag and the shell close to the air bag along the axial direction, and the air bag is sleeved outside the inner cover two along the radial direction; and / or the shell inlet and the shell outlet are respectively provided with electromagnetic valves for controlling opening and closing.

9. The filter to prevent water hammer as defined in claim 1, wherein the shell comprises a shell body and a shell end cover, the shell inlet and the shell outlet are arranged on the shell body, and the shell end cover covers the end of the shell body away from the shell inlet along the axial direction and defines the cavity together with the shell body.

10. A water purifier characterized by comprising: the shell inlet is an inlet of the water purifier or is communicated with the inlet of the water purifier, and the shell outlet is an outlet of the water purifier or is communicated with the outlet of the water purifier.

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