CN219752000U - Back flush end water purifier adjusted by screwing - Google Patents
Back flush end water purifier adjusted by screwing Download PDFInfo
- Publication number
- CN219752000U CN219752000U CN202321019735.XU CN202321019735U CN219752000U CN 219752000 U CN219752000 U CN 219752000U CN 202321019735 U CN202321019735 U CN 202321019735U CN 219752000 U CN219752000 U CN 219752000U
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- sewage
- filter element
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 216
- 238000011010 flushing procedure Methods 0.000 claims abstract description 51
- 239000010865 sewage Substances 0.000 claims abstract description 43
- 238000000746 purification Methods 0.000 claims abstract description 17
- 239000008213 purified water Substances 0.000 claims abstract description 17
- 238000011001 backwashing Methods 0.000 claims abstract description 12
- 239000004579 marble Substances 0.000 claims description 29
- 238000007599 discharging Methods 0.000 claims description 7
- 230000005540 biological transmission Effects 0.000 claims description 5
- 230000000903 blocking effect Effects 0.000 claims description 4
- 238000007789 sealing Methods 0.000 claims description 3
- 230000001105 regulatory effect Effects 0.000 claims 9
- 238000005406 washing Methods 0.000 claims 1
- 239000012528 membrane Substances 0.000 abstract description 23
- 238000001914 filtration Methods 0.000 abstract description 12
- 230000004907 flux Effects 0.000 abstract description 5
- 239000002245 particle Substances 0.000 abstract description 4
- 238000009434 installation Methods 0.000 description 8
- 239000011148 porous material Substances 0.000 description 4
- 230000008021 deposition Effects 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 238000001179 sorption measurement Methods 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 2
- 239000012535 impurity Substances 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 230000002035 prolonged effect Effects 0.000 description 2
- 238000000926 separation method Methods 0.000 description 2
- 230000009471 action Effects 0.000 description 1
- 230000004075 alteration Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 239000000084 colloidal system Substances 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 238000011109 contamination Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000012527 feed solution Substances 0.000 description 1
- 229920002521 macromolecule Polymers 0.000 description 1
- 239000011859 microparticle Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Abstract
The utility model discloses a back flush tail end water purifier with screwing adjustment, which comprises a shell, a filter element, a shell seat, an adjusting turntable, a water outlet grid, a back flush filter disc and a filter disc pressing plate, wherein the shell is provided with a water inlet and a water outlet; the shell is a cylindrical shell with a cylindrical cavity in the middle and an opening at the bottom; the bottom of the shell seat is provided with a purified water inlet, a back flush water inlet, a purified water outlet and a back flush water outlet; a clean water flushing switching valve core is arranged below the clean water inlet and the backwash water inlet; a clean water discharge opening and closing valve core is arranged below the clean water discharge opening; and a sewage discharge opening and closing valve core is arranged below the backwashing water outlet. The back flush tail end water purifier with the screwing adjustment can reversely flush the filter element assembly, wash away adsorbed, deposited and blocked particles on the surface or in a membrane hole of the filter element, recover the water flux and the filtering precision of the filter element of the filter membrane, ensure the good filtering performance of the filter element and prolong the service life of the filter element; the water purification filtration and back flushing functions are convenient to switch and adjust.
Description
Technical Field
The utility model relates to the technical field of water purifiers, in particular to a back flush tail end water purifier adjusted by screwing.
Background
In the existing water purification treatment method, membrane pollution phenomenon is likely to occur along with the increase of operation time in the use process of the membrane water treatment technology, so that the performances of membrane permeation flux, rejection rate and the like are changed, the service life is shortened, and the practical application of the membrane separation technology is greatly hindered. Therefore, it is necessary to take corresponding cleaning measures and control measures to partially or completely recover the film properties.
In the current filtration system of the household water purifier, the main reason for membrane pollution is adsorption pollution on the surface of the membrane. Membrane adsorption pollution refers to the phenomenon that membrane pore diameters become smaller or are blocked due to adsorption and deposition on the membrane surface or in membrane pores caused by physical, chemical or mechanical action of microparticles, colloid particles and solute macromolecules in a treatment material and the membrane, so that membrane flux and separation characteristics of the membrane are changed. The contamination layer formed by the deposition of the components in the feed solution on the membrane surface will increase the resistance of the membrane process, which may be much greater than the resistance of the membrane itself; deposition of the components in the membrane pores will result in a reduction or even clogging of the membrane pores.
At present, after a household water purifier is used for a period of time, a regular direct abandoned filter element is adopted, and a new filter element is replaced to maintain the filtering performance of the water purifier, so that a household membrane filter element component becomes a consumable, and a great amount of material resources and financial resources are wasted and lost.
Disclosure of Invention
The utility model aims to provide a back flush tail end water purifier with screwing adjustment, which has simple and reasonable design, stable and reliable structure and convenient switching and adjustment of water purification filtration and back flush functions; the filter element component can be reversely washed, particles which are adsorbed, deposited and blocked on the surface or in the membrane hole of the filter element are washed away, the water flux and the filtering precision of the filter element are recovered, the good filtering performance of the filter element is ensured, and the service life of the filter element is prolonged.
In order to solve the technical problems, the technical scheme of the utility model is as follows:
a back flush tail end water purifier with screwing adjustment comprises a shell, a filter element, a shell seat, a water outlet grid, a back flush filter disc, a filter disc pressing plate and an adjustment turntable;
the shell is a shell with a cavity in the middle and an opening at the bottom;
the filter element is arranged in the cavity of the shell, the middle part of the filter element is provided with the cavity, the outer wall of the filter element is provided with a plurality of micropores for water permeation, and impurities are blocked outside the micropores (outside the outer wall).
The shell seat is a shell with an opening at the upper end and a column cavity in the middle; the shell is vertically arranged, and the bottom end of the shell is connected with the shell seat; the sealing ring is arranged between the shell and the shell seat through pressing to ensure air tightness.
The water outlet grid is a bottom end cover provided with a plurality of drainage meshes, and one side of the drainage meshes is provided with a sewage diversion cavity for discharging sewage after backwashing.
A mounting cavity for backwashing filter discs is arranged in the column cavity of the shell seat; the back flushing filter disc is arranged in the mounting cavity;
the filter plate pressing plate is arranged in the column cavity of the shell seat and is positioned between the filter element and the back flushing filter plate (usually pressed on the back flushing filter plate), and a through hole is arranged on the filter plate pressing plate.
The bottom of the shell seat is provided with a purified water inlet, a back flush water inlet, a purified water outlet and a back flush water outlet; the interval area between the inner wall of the shell and the outer wall of the filter element is communicated with the purified water inlet, and the interval area between the inner wall of the shell and the outer wall of the filter element is communicated with the backwashing water outlet; the back flush water inlet and the purified water outlet are communicated with the column cavity.
A clean water flushing switching valve core is arranged below the clean water inlet and the backwash water inlet; a clean water discharge opening and closing valve core is arranged below the clean water discharge opening; and a sewage discharge opening and closing valve core is arranged below the backwashing water outlet.
The adjusting turntable is in meshed transmission connection with the clean water flushing switching valve core, the clean water draining switching valve core and the sewage draining switching valve core. The rotary adjusting disk can rotate the clean water flushing switching valve core, the clean water draining switching valve core and the sewage draining switching valve core around the axis of the rotary adjusting disk. When the ball valve rotates, the ball at the top of the clean water flushing switching valve core, the clean water draining switching valve core and the sewage draining switching valve core can move to the position, so that the ball can block or avoid the clean water inlet, the backwash water inlet, the clean water outlet and the backwash water outlet at the bottom of the shell seat.
When the water purification is used normally: the marble of the clean water flushing switching valve core seals the back flushing water inlet, the clean water inlet is communicated with the water inlet pipe, water flows into a spacing area between the inner wall of the shell and the outer wall of the filter element, then filtered and permeated into the filter element from the outer wall of the filter element, flows to the clean water outlet through the back flushing filter plate at the bottom of the filter element, flows through the clean water discharging valve core, and flows out through the water discharging hole on the water outlet grating.
During back flushing: the marble of the clean water flushing switching valve core seals the clean water inlet, the backwash water inlet is communicated with the water inlet pipe, water flows into the filter element after passing through the backwash filter disc, is flushed and permeated to a spacing area between the inner wall of the filter element and the outer wall of the filter element, and then flows through the sewage discharge opening valve core and the sewage diversion cavity to be discharged through the backwash water outlet.
The water purification flushing switching valve core comprises a water purification function valve position and a back flushing function valve position, wherein the position of the top marble for blocking the back flushing water inlet is the water purification function valve position, and the position of the top marble for blocking the water purification water inlet is the back flushing function valve position.
The clean water inlet and the clean water outlet are synchronously opened or synchronously closed (i.e. blocked or avoided by the marble at the same time), and the backwash water inlet and the backwash outlet are synchronously opened or synchronously closed.
The utility model has the beneficial effects that:
the water purifying and filtering device has the advantages of simple and reasonable design, stable and reliable structure and convenient switching and adjustment of the water purifying and filtering and back flushing functions; the filter element component can be reversely washed, particles which are adsorbed, deposited and blocked on the surface or in the membrane hole of the filter element are washed away, the water flux and the filtering precision of the filter element are recovered, the good filtering performance of the filter element is ensured, and the service life of the filter element is prolonged.
Drawings
FIG. 1 is a schematic diagram of a back flush end water purifier with screw adjustment according to the present utility model;
FIG. 2 is a top view of a back flush end water purifier with screw adjustment according to the present utility model;
FIG. 3 is a cross-sectional view taken along the direction C-C in FIG. 2;
FIG. 4 is an exploded view of a back flush end water purifier with screw adjustment according to the present utility model;
fig. 5 is a partially exploded view of a back-flush end water purifier with screw adjustment according to the present utility model.
Detailed Description
The following describes the embodiments of the present utility model further with reference to the drawings. The description of these embodiments is provided to assist understanding of the present utility model, but is not intended to limit the present utility model. In addition, the technical features of the embodiments of the present utility model described below may be combined with each other as long as they do not collide with each other.
As shown in fig. 1-5, the back flush tail end water purifier with screwing adjustment comprises a shell 1, a filter element 2, a shell seat 3, a water outlet grid 5, a back flush filter disc 6, a filter disc pressing plate 7 and an adjustment rotary disc 4;
the shell 1 is a cylindrical shell with a cylindrical cavity in the middle and an opening at the bottom;
the filter element 2 is columnar, is arranged in a columnar cavity of the shell 1, is provided with a cavity in the middle, and is provided with a plurality of micropores on the outer wall for water permeation to block impurities out of the micropores (outside the outer wall).
The shell seat 3 is a shell with an opening at the upper end and a column cavity in the middle; the shell 1 is vertically arranged, and the bottom end of the shell is connected with the shell seat 3; the air tightness is ensured between the shell 1 and the shell seat 3 through the pressing of a sealing ring.
The water outlet grid 5 is a bottom end cover provided with a plurality of water discharge meshes 52, and one side of the water discharge meshes 52 is provided with a sewage diversion cavity 51 for discharging sewage after backwashing.
A mounting cavity for backwashing the filter disc 6 is arranged in the column cavity 30 of the shell seat 3; the back flushing filter disc 6 is arranged in the mounting cavity;
the filter plate pressing plate 7 is arranged in the column cavity of the shell seat 3, is positioned between the filter element 2 and the back flushing filter plate 6 (is usually pressed on the back flushing filter plate 6), and is provided with a through hole.
The bottom of the shell seat 3 is provided with a purified water inlet 31, a back flush water inlet 32, a purified water outlet 33 and a back flush outlet 34; the interval area between the inner wall of the shell 1 and the outer wall of the filter element 2 is communicated with the purified water inlet 31, and the interval area between the inner wall of the shell 1 and the outer wall of the filter element 2 is communicated with the backwashing water outlet 34; the back flush water inlet 32 and the clean water outlet 33 are communicated with the column cavity 30.
A clean water flushing switching valve core 8 is arranged below the clean water inlet 31 and the backwash water inlet 32; a clean water discharge opening/closing valve core 9 is arranged below the clean water discharge opening 33; a sewage discharge on-off valve core 10 is arranged below the backwash drain outlet 34.
The adjusting turntable 4 is in meshed transmission connection with the clean water flushing switching valve core 8, the clean water draining on-off valve core 9 and the sewage draining on-off valve core 10. The rotation of the adjustment dial 4 rotates the clean water flushing switching valve core 8, the clean water discharge opening/closing valve core 9, and the dirty water discharge opening/closing valve core 10 about their own axes. When the ball rotates, the balls at the tops of the clean water flushing switching valve core 8, the clean water discharging opening and closing valve core 9 and the sewage discharging opening and closing valve core 10 can move to positions, so that the balls can block or avoid the clean water inlet 31, the backwash water inlet 32, the clean water outlet 33 and the backwash water outlet 34 at the bottom of the shell seat 3.
When the water purification is used normally: the marble 84 of the clean water flushing switching valve core 8 seals the backwash water inlet 32, the clean water inlet 31 is communicated with the water inlet pipe 11, water flows into a spacing area between the inner wall of the shell 1 and the outer wall of the filter element 2, then filtered and permeated into the filter element 2 from the outer wall of the filter element 2, flows to the clean water outlet 33 through the backwash filter disc 6 at the bottom of the filter element 2, flows through the clean water discharge opening and closing valve core 9, and flows out through the water discharge mesh 52 on the water outlet grid 5.
During back flushing: the marble 84 of the clean water flushing switching valve core 8 seals the clean water inlet 31, the backwash water inlet 32 is communicated with the water inlet pipe 11, water flows into the filter element 2 after flowing through the backwash filter disc 6, is flushed and permeated into a spacing area between the inner wall of the shell 1 and the outer wall of the filter element 2 from the inner wall of the filter element 2, and flows through the sewage discharge outlet 34, flows through the sewage discharge opening valve core 10 and the sewage diversion cavity 51 and is discharged.
The clean water flushing switching valve core 8 comprises a clean water function valve position and a back flushing function valve position, wherein the position of the top marble 84 when the top marble 84 seals the back flushing water inlet 32 is the clean water function valve position, and the position of the top marble 84 when the top marble 84 seals the clean water inlet 31 is the back flushing function valve position.
The clean water inlet 31 and the clean water outlet 33 are synchronously opened or synchronously closed (i.e. simultaneously blocked or avoided by the marble 84), and the backwash water inlet 32 and the backwash water outlet 34 are synchronously opened or synchronously closed.
Preferably, the adjusting turntable 4 is an annular turntable, and a plurality of convex teeth 41 are uniformly distributed in the adjusting turntable;
the water purification flushing switching valve core 8 comprises a valve body 81, a spring mounting cavity 82, a spring 83, a marble 84 and a limiting cover plate 85; the outer wall of the valve body 81 is uniformly provided with a plurality of convex teeth 41, the valve body 81 is connected with the adjusting turntable 4 in a meshed mode, and the convex teeth 41 of the valve body and the adjusting turntable are in meshed transmission. The spring 83 is vertically arranged in the spring mounting cavity 82, and the top of the spring is provided with a marble 84; the limit cover plate 85 is covered on the top of the valve body 81 and the marble 84, and is provided with a water purifying valve hole 86 and a flushing valve hole 87. When the clean water flushing switching valve core 8 is rotated, the marble 84 can switch to block the clean water valve hole 86 and the flushing valve hole 87. The bottom of the shell seat 3 corresponding to the top of the water purification flushing switching valve core 8 is provided with a water purification flushing valve core mounting cavity 80; the water purifying valve hole 86 is communicated with the water purifying inlet 31 in a fitting way; flush valve opening 87 is in fitting communication with backwash water inlet 32.
The water draining and opening and closing valve core 9 comprises a valve body II 91, a plurality of convex teeth 41 are uniformly distributed on the outer wall of the valve body II 91, a water draining hole 92 is formed in the top of the valve body II, and the bottom of the water draining hole 92 is communicated with the draining mesh 52 of the water outlet grid 5. The bottom of the shell seat 3 corresponding to the top of the water draining and purifying on-off valve core 9 is provided with a water draining valve core installation cavity 35, a spring installation cavity II is arranged in the water draining valve core installation cavity 35, a spring II 37 is arranged in the spring installation cavity II in an internal pressure mode, and the top of the spring II 37 is connected with a marble II 38. When the clean water discharge opening/closing valve core 9 is rotated, the second marble 38 can block the clean water discharge hole 92 or avoid the clean water discharge hole 92.
The sewage discharge on-off valve core 10 comprises a valve body III 101, a plurality of convex teeth are uniformly distributed on the outer wall of the valve body III 101, a sewage drain hole 102 is formed in the top of the valve body III, and the bottom of the sewage drain hole 102 is communicated with the sewage diversion cavity 51. The sewage discharge valve core 10 is characterized in that a sewage discharge valve core installation cavity 20 is arranged at the bottom of the shell seat 3 corresponding to the top of the sewage discharge valve core 10, a spring installation cavity III is arranged in the sewage discharge valve core installation cavity 20, a spring III 22 is arranged in the spring installation cavity III in an internal pressure mode, and the top of the spring III 22 is connected with a marble III 23. When the sewage drain opening/closing valve core 10 is rotated, the third marble 23 can block the sewage drain hole 102 or avoid the sewage drain hole 102.
Preferably, the outer wall of the adjusting turntable 4 is provided with a hand breaking device, so that the hand breaking device is convenient to screw.
Alternatively, the second spring mounting cavity may be disposed coincident with the backwash drain 34, i.e., the second spring 37 is disposed through the backwash drain 34.
The water outlet grating 5 is fixedly connected with the shell seat 3 through the mounting holes 53 by fasteners such as screws.
The embodiments of the present utility model have been described in detail above with reference to the accompanying drawings, but the present utility model is not limited to the described embodiments. It will be apparent to those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the utility model, and still fall within the scope of the utility model.
Claims (10)
1. The utility model provides a back flush terminal water purifier of regulation is twisted soon, includes shell, filter core, housing base, play cascade, back flush filter piece, its characterized in that: the device also comprises an adjusting turntable;
the shell is a shell with a cavity in the middle and an opening at the bottom;
the filter element is arranged in the cavity of the shell;
the shell seat is a shell with an opening at the upper end and a column cavity in the middle; the bottom end of the shell is connected with the shell seat;
a mounting cavity for backwashing filter discs is arranged in the column cavity of the shell seat; the back flushing filter disc is arranged in the mounting cavity;
the bottom of the shell seat is provided with a purified water inlet, a back flush water inlet, a purified water outlet and a back flush water outlet;
a clean water flushing switching valve core is arranged below the clean water inlet and the backwash water inlet; a clean water discharge opening and closing valve core is arranged below the clean water discharge opening; and a sewage discharge opening and closing valve core is arranged below the backwashing water outlet.
2. The screw-on regulated backwash end water purifier of claim 1 wherein: the interval area between the inner wall of the shell and the outer wall of the filter element is communicated with the purified water inlet, and the interval area between the inner wall of the shell and the outer wall of the filter element is communicated with the backwashing water outlet; the back flush water inlet and the purified water outlet are communicated with the column cavity.
3. The screw-on regulated backwash end water purifier of claim 2 wherein: the adjusting turntable is an annular turntable, and a plurality of convex teeth are uniformly distributed in the adjusting turntable;
the adjusting turntable is in meshed transmission connection with the clean water flushing switching valve core, the clean water draining switching valve core and the sewage draining switching valve core.
4. The screw-on regulated backwash end water purifier of claim 3 wherein: the water purification flushing switching valve core comprises a water purification function valve position and a back flushing function valve position, wherein the position of the top marble for blocking the back flushing water inlet is the water purification function valve position, and the position of the top marble for blocking the water purification water inlet is the back flushing function valve position;
the clean water inlet and the clean water outlet are synchronously opened or synchronously closed, and the backwash water inlet and the backwash outlet are synchronously opened or synchronously closed.
5. The screw-regulated backwash end water purifier of any one of claims 1-4 wherein: the water purification flushing switching valve core comprises a valve body, a spring mounting cavity, a spring, a marble and a limiting cover plate; a plurality of convex teeth are uniformly distributed on the outer wall of the valve body, the valve body is connected with the adjusting turntable in a meshed manner, and the convex teeth of the valve body and the adjusting turntable are meshed for transmission; the spring is vertically arranged in the spring mounting cavity, and the top of the spring is provided with a marble; the limit cover plate is covered on the top of the valve body and the marble, and is provided with a water purifying valve hole and a flushing valve hole;
when the switching valve core is washed by rotating the purified water, the marble can switch and block the purified water valve hole and the washing valve hole;
the water purifying valve hole is communicated with the water purifying inlet, and the flushing valve hole is communicated with the back flushing inlet.
6. The screw-on regulated backwash end water purifier of claim 5 wherein: the water draining and purifying valve core comprises a valve body II, wherein a plurality of convex teeth are uniformly distributed on the outer wall of the valve body, the top of the valve body II is provided with water draining holes, and the bottoms of the water draining holes are communicated with draining meshes of the water outlet grating; the water discharge valve core is arranged at the bottom of the shell seat corresponding to the top of the water discharge valve core, a spring mounting cavity II is arranged in the water discharge valve core mounting cavity, a spring II is arranged in the spring mounting cavity II in an internal pressure mode, and the top of the spring II is connected with a marble II;
when the water draining valve core is rotated, the ball II can block the water draining hole or avoid the water draining hole;
the purified water drain hole is communicated with the purified water drain hole.
7. The screw-on regulated backwash end water purifier of claim 6 wherein: the sewage discharge on-off valve core comprises a valve body III, a plurality of convex teeth are uniformly distributed on the outer wall of the valve body III, a sewage drain hole is formed in the top of the valve body III, and the bottom of the sewage drain hole is communicated with a sewage diversion cavity; a sewage discharge valve core mounting cavity is formed in the bottom of the shell seat corresponding to the top of the sewage discharge valve core, a spring mounting cavity III is formed in the sewage discharge valve core mounting cavity, a spring III is arranged in the spring mounting cavity III in an internal pressure mode, and the top of the spring III is connected with a marble III;
when the sewage draining on-off valve core is rotated, the marble III can block the sewage draining hole or avoid the sewage draining hole;
the sewage drain hole is communicated with the back flush drain hole.
8. The screw-on regulated backwash end water purifier of claim 7 wherein: the outer wall of the adjusting turntable is provided with a hand breaking device;
it also includes a filter press;
the filter plate pressing plate is arranged in the column cavity of the shell seat and is positioned between the filter element and the back flushing filter plate, and a through hole is formed in the filter plate pressing plate.
9. The screw-on regulated backwash end water purifier of claim 8 wherein: and a sealing ring is pressed between the shell and the shell seat.
10. The screw-on regulated backwash end water purifier of claim 5 wherein: the water outlet grid is a bottom end cover provided with a plurality of drainage meshes, and one side of the drainage meshes is provided with a sewage diversion cavity for discharging sewage after backwashing.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321019735.XU CN219752000U (en) | 2023-05-03 | 2023-05-03 | Back flush end water purifier adjusted by screwing |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321019735.XU CN219752000U (en) | 2023-05-03 | 2023-05-03 | Back flush end water purifier adjusted by screwing |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN219752000U true CN219752000U (en) | 2023-09-26 |
Family
ID=88087939
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202321019735.XU Active CN219752000U (en) | 2023-05-03 | 2023-05-03 | Back flush end water purifier adjusted by screwing |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN219752000U (en) |
-
2023
- 2023-05-03 CN CN202321019735.XU patent/CN219752000U/en active Active
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