CN219284047U - Heat exchange plate and gas water heater - Google Patents
Heat exchange plate and gas water heater Download PDFInfo
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- CN219284047U CN219284047U CN202223540341.7U CN202223540341U CN219284047U CN 219284047 U CN219284047 U CN 219284047U CN 202223540341 U CN202223540341 U CN 202223540341U CN 219284047 U CN219284047 U CN 219284047U
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B30/00—Energy efficient heating, ventilation or air conditioning [HVAC]
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Abstract
The utility model relates to the technical field of gas water heaters, and discloses a heat exchange plate and a gas water heater. The heat exchange plate body is provided with an air inlet side and an air outlet side; the heat exchange plate body is sequentially provided with a first through hole group and a second through hole group which are separated from each other along a first direction; the first through hole group comprises a plurality of first through holes which are spaced along a second direction, and the second through hole group comprises a plurality of second through holes which are spaced along the second direction; the first through holes and the second through holes are staggered in the second direction; the first direction is a direction from the air inlet side to the air outlet side, and the second direction is perpendicular to the first direction; the first flow dividing piece is connected with the heat exchange plate body and is arranged between two adjacent first through holes; the second flow dividing piece is connected to the heat exchange plate body and arranged between two adjacent second through holes, and extends from between the first through holes and the second through holes to be parallel and level with the bottom end of one side, far away from the first through hole group, of the second through holes. The heat exchange plate disclosed by the utility model has the advantages that the heat exchange is more sufficient, and the heat exchange area and the heat exchange efficiency are improved.
Description
Technical Field
The utility model relates to the technical field of gas water heaters, in particular to a heat exchange plate and a gas water heater.
Background
Along with the development of social economy, resources are becoming scarce, energy-saving appliances are being developed, and the energy-saving requirement of the gas water heater is also becoming higher. The heat exchanger is a core component of the gas water heater and plays a key role in the utilization rate of the gas. The heat exchange structure of the heat exchanger comprises a plurality of groups of spiral light pipes for heat exchange, a flat pipe for spiral light pipe for heat exchange, a spiral fin for light pipe for heat exchange and the like.
In the related art, the heat exchange structure can also be arranged into a fin arrangement adding pipe group, wherein fins are core parts of the heat exchanger, and the heat exchange efficiency of the heat exchanger is directly affected. The defect that exists in this kind of structure is that some positions are local high temperature, and the temperature can not be transmitted away fast and lead to burning out the fin easily, and then influences the life-span of heat exchanger.
Therefore, a heat exchanger plate and a gas water heater are needed to solve the above problems.
Disclosure of Invention
One of the technical problems to be solved by the utility model is to provide a heat exchange plate which can effectively solve the problem of damage caused by local high temperature, and has higher heat exchange efficiency and better heat exchange effect.
The second technical problem to be solved by the utility model is to provide the gas water heater, which can effectively solve the problem of short service life of the gas water heater caused by damage of the heat exchange plates, and is safer and more reliable to use and longer in service life.
The first technical problem is solved by the following technical scheme:
a heat exchanger plate, comprising:
a heat exchanger plate body having an inlet side and an outlet side; the heat exchange plate body is sequentially provided with a first through hole group and a second through hole group which are separated from each other along a first direction; the first via group includes a plurality of first vias spaced apart along a second direction, and the second via group includes a plurality of second vias spaced apart along the second direction; the first through holes and the second through holes are staggered in the second direction; the first direction is a direction from the air inlet side to the air outlet side, and the second direction is perpendicular to the first direction;
the first flow dividing piece is connected with the heat exchange plate body and arranged between two adjacent first through holes; a kind of electronic device with high-pressure air-conditioning system
The second flow dividing piece is connected to the heat exchange plate body and arranged between two adjacent second through holes, and extends from between the first through holes and the second through holes to be parallel and level with the bottom end of the second through holes away from one side of the first through hole group.
Compared with the background technology, the heat exchange plate has the following beneficial effects:
according to the utility model, the first through hole and the second through hole are formed in the heat exchange plate body and are used for penetrating the heat exchange tube, liquid circulates in the heat exchange tube, and when high-temperature flue gas flows through the heat exchange plate, the high-temperature flue gas can exchange heat with the liquid in the heat exchange tube; through the first through holes and the second through holes which are respectively arranged at intervals along the second direction and staggered along the first direction, the flue gas can flow for a longer distance between the first through holes and the second through holes, so that the flow paths are more tortuous and diversified, and further, the heat exchange between the flue gas and liquid in the heat exchange tube is more sufficient; meanwhile, the problem of damage to the heat exchange plates caused by overhigh local temperature is effectively reduced. Through setting up first reposition of redundant personnel spare and second reposition of redundant personnel for shunt the flue gas for the flue gas can pass through in proper order between first reposition of redundant personnel spare and the first through-hole, and between second reposition of redundant personnel spare and the second through-hole, increase the area of contact of the outer wall of the interior heat exchange tube of flue gas and through-hole, and then improve heat exchange efficiency, make the heat transfer more abundant simultaneously. Specifically, the second flow dividing piece extends from between the first through hole and the second through hole to the bottom end of the second through hole far away from one side of the first through hole group to be flush, so that the flow dividing effect on the smoke flowing between the first flow dividing piece and the first through hole can be effectively improved, the flowing distance of the smoke between the second flow dividing piece and the second through hole is increased, and the heat exchange area and the heat exchange efficiency are further improved; meanwhile, the weight of the heat exchange plate body can be effectively reduced while the heat exchange efficiency is improved by increasing the area of the second flow dividing piece, so that the material is saved, and the cost is reduced.
In one embodiment, the first through hole and/or the second through hole are/is provided as a flanging hole, and the flanging of the flanging hole is formed by bending the heat exchange plate body.
In one embodiment, the first splitter is sequentially provided with a first head and a first side wing along the first direction, the first head is arranged between connecting lines of circle centers of two adjacent first through holes, and a first channel is arranged between the first side wing and the edge of the first through hole.
In one embodiment, the second shunt is sequentially provided with a second head and second flanks arranged on two sides of the second head along the first direction, the second head is arranged between the first through hole and the second through hole, and one end of the second flank away from the second head extends to the bottom end of the second through hole away from one side of the first through hole group.
In one embodiment, the second side wing includes a diversion section and a diversion section, and an end of the diversion section away from the diversion section extends to a bottom end of the second through hole away from the first through hole group.
In one embodiment, a second channel is arranged between the diversion section and the second through hole, a third channel is arranged between the diversion section and the edge of the second through hole, and the width of the third channel is smaller than that of the second channel.
In one embodiment, the first through hole and/or the second through hole are provided as an ellipse, and a major axis of the ellipse is parallel to the first direction.
In one embodiment, the heat exchange plate body is folded along two sides of the first direction to form a smoke collecting flange.
In one embodiment, the heat exchanger plate body is provided with a lightening hole, and the lightening hole is arranged between the second through hole and the first flow dividing piece.
The second technical problem is solved by the following technical scheme:
the gas water heater comprises a heat exchange tube and the heat exchange plate according to any scheme, wherein the heat exchange tube is arranged in the first through hole and the second through hole in a penetrating mode.
Compared with the background technology, the gas water heater has the beneficial effects that:
the heat exchange plate provided by the utility model has a good heat exchange effect and high heat exchange efficiency, can effectively avoid the damage of the heat exchange plate caused by local overheating, is safer and more reliable in the whole machine use process, and further has longer service life.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present utility model, the following description will briefly explain the drawings needed in the description of the embodiments of the present utility model, and it is obvious that the drawings in the following description are only some embodiments of the present utility model, and other drawings may be obtained according to the contents of the embodiments of the present utility model and these drawings without inventive effort for those skilled in the art.
FIG. 1 is a schematic view of a heat exchanger plate provided in an embodiment of the present utility model;
fig. 2 is a schematic view of flue gas flowing through a heat exchanger plate according to an embodiment of the present utility model.
Description of the reference numerals:
1. a heat exchange plate body; 11. smoke gathering and flanging; 12. a lightening hole;
21. a first through hole; 22. a second through hole; 23. flanging the through hole;
31. a first shunt; 311. a first head; 312. a first side wing; 32. a second flow dividing member; 321. a second head; 323. a second side wing; 3231. a shunt section; 3232. and a diversion section.
Detailed Description
The following description of the embodiments of the present application will be made clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are only some, but not all, of the embodiments of the present application. All other embodiments, which can be made by one of ordinary skill in the art without undue burden from the present disclosure, are within the scope of the present disclosure.
In the description of the present application, it should be understood that the terms "upper," "lower," "vertical," "horizontal," and the like indicate an orientation or a positional relationship based on that shown in the drawings, and are merely for convenience of description and simplification of the description, and do not indicate or imply that the apparatus or element in question must have a specific orientation, be configured and operated in a specific orientation, and therefore should not be construed as limiting the present application.
The terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more such feature. In the description of the present application, unless otherwise indicated, the meaning of "a plurality" is two or more.
In the description of the present application, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the terms in this application will be understood by those of ordinary skill in the art in a specific context.
As shown in fig. 1 and 2, the present embodiment provides a heat exchanger plate including a heat exchanger plate body 1, a first flow splitter 31, and a second flow splitter 32, the heat exchanger plate body 1 having an air inlet side and an air outlet side; the heat exchange plate body 1 is sequentially provided with a first through hole group and a second through hole group which are separated from each other along a first direction; the first through hole group comprises a plurality of first through holes 21 which are spaced along a second direction, the second through hole group comprises a plurality of second through holes 22 which are spaced along the second direction, the first through holes 21 and the second through holes 22 are staggered in the second direction, the first direction is a direction from the air inlet side to the air outlet side, and the second direction is perpendicular to the first direction; the first flow dividing piece 31 is connected to the heat exchange plate body 1 and is arranged between two adjacent first through holes 21; the second flow dividing member 32 is connected to the heat exchanger plate body 1 and disposed between two adjacent second through holes 22, and the second flow dividing member 32 extends from between the first through hole 21 and the second through hole 22 to be flush with the bottom end of the second through hole 22 away from the first through hole set.
The heat exchange plate body 1 is provided with the first through holes 21 and the second through holes 22 which are used for penetrating the heat exchange tube, liquid circulates in the heat exchange tube, and when high-temperature flue gas flows through the heat exchange plate, the high-temperature flue gas can exchange heat with the liquid in the heat exchange tube; through the first through holes 21 and the second through holes 22 which are respectively arranged at intervals along the second direction and staggered along the first direction, the flue gas can flow for a longer distance between the first through holes 21 and the second through holes 22, so that the flow paths are more tortuous and diversified, and further, the heat exchange between the flue gas and the liquid in the heat exchange tube is more sufficient; meanwhile, the problem of damage to the heat exchange plates caused by overhigh local temperature is effectively reduced. Through setting up first reposition of redundant personnel piece 31 and second reposition of redundant personnel piece 32 for shunt the flue gas for the flue gas can pass through in proper order between first reposition of redundant personnel piece 31 and the first through-hole 21, and between second reposition of redundant personnel piece 32 and the second through-hole 22, increases the area of contact of the outer wall of the interior heat exchange tube of flue gas and through-hole, and then improves heat exchange efficiency, makes the heat transfer more abundant simultaneously. Specifically, the second flow dividing member 32 extends from between the first through hole 21 and the second through hole 22 to be flush with the bottom end of the second through hole 22 away from the side of the first through hole group, so that the flow dividing effect on the flue gas flowing between the first flow dividing member 31 and the first through hole 21 can be effectively improved, the flowing distance of the flue gas between the second flow dividing member 32 and the second through hole 22 is increased, and the heat exchange area and the heat exchange efficiency are further improved. Meanwhile, by increasing the area of the second flow dividing member 32, the heat exchange efficiency is improved, and meanwhile, the weight of the heat exchange plate body 1 can be effectively reduced, the materials are saved, and the cost is reduced.
It is worth to say that the heat exchange plates in the related art are mainly made of copper, and the heat exchange plates made of aluminum and stainless steel are relatively less in consumption, mainly because of low heat exchange coefficients of aluminum and stainless steel. In the embodiment, the heat exchange plates are mainly made of stainless steel, and have good corrosion resistance. Alternatively, the heat exchange plates are made of SUS441 stainless steel.
Illustratively, the first direction of the flue gas flow is from top to bottom and the second direction is a horizontal direction. The number of the first through holes 21 is one more than the number of the second through holes 22, that is, the first through holes 21 are arranged with six at intervals along the second direction, and the second through holes 22 are arranged with five at intervals along the second direction. The arrangement is such that the width of the flue gas of the heat exchanger plates in the first direction is gradually reduced.
Further, both sides of the heat exchange plate body 1 along the first direction are folded and folded to form a smoke gathering flanging 11. Through setting up the cigarette turn-ups 11 that draws in, can play the effect of gathering together to the flue gas, avoid the flue gas to flow out the heat exchanger fin effectively, and the flue gas waste that causes has guaranteed the utilization ratio and the heat transfer effect of taking a breath.
It is worth to say that the edges of the smoke gathering flange 11, the first through hole 21 and the second through hole 22 are all adapted, namely, the width of a smoke circulation channel between the smoke gathering flange 11, the first through hole 21 and the second through hole 22 is consistent, the contact area of the smoke and the heat exchange tube in the through hole can be increased while gathering the smoke, and the heat exchange effect is ensured.
As an alternative to a heat exchanger plate, the first through hole 21 and/or the second through hole 22 are provided with through hole flanges 23, by providing through hole flanges 23, the installation between the heat exchanger tube and the first through hole 21 and/or the second through hole 22 is facilitated.
Correspondingly, the first flow dividing piece 31 and/or the second flow dividing piece 32 are provided with flanging holes, so that a channel for flue gas to flow can be enclosed between the flow dividing piece and the through hole, and the flow dividing and disturbing effects on the flue gas are more obvious and reliable.
Alternatively, the flanges 23 are formed by bending the heat exchange plate body 1, so that the processing is more convenient. Wherein the height of the flanging can be set to be 1.7mm, so that the flow distribution can be realized and the processing is facilitated.
Specifically, the first splitter 31 is sequentially provided with the first head 311 and the first side wings 312 along the first direction, and the first head 311 is arranged between the connecting lines of the centers of the adjacent two first through holes 21, so that the flue gas can have a wider circulation width when just entering between the two first through holes 21. Optionally, the top end of the first header 311 is flush with the line of the circle centers of the two adjacent first through holes 21, and when the flue gas flows to the position of the line of the circle centers of the two adjacent first through holes 21, the flue gas is split due to the arrangement of the first header 311, so as to be split into two streams and respectively flows into the first channel surrounded by the flange of the first side wing 312 and the flange of the first through hole 21 near the side of the first side wing 312. Preferably, the width of the first channels between the first wings 312 and the edges of the first through holes 21 is the same, alternatively, may be set to 2.5mm. So set up, can shunt the flue gas to first through-hole 21 department more effectively to guarantee the area of contact of flue gas and the heat exchange tube in the first through-hole 21, guarantee the heat transfer effect.
Further, the second flow dividing member 32 is sequentially provided with a second head 321 and second flanks 323 disposed on two sides of the second head 321 along the first direction, and the second head 321 is disposed between the first through hole 21 and the second through hole 22, so as to ensure that the flue gas flowing into the second flow dividing member 32 will be divided earlier. The end of the second flank 323 far away from the second head 321 extends to the bottom end of the second through hole 22 far away from one side of the first through hole set, so as to ensure that the flue gas can be completely split by the second splitter 32, and further improve the heat exchange efficiency.
In this embodiment, the second side wing 323 includes a flow dividing section 3231 and a flow guiding section 3232, where the flow dividing section 3231 and the flow guiding section 3232 are sequentially arranged along the first direction. The end of the diversion section 3232 far away from the diversion section 3231 extends to the bottom end of the second through hole 22 far away from the first through hole group, and the diversion section 3231 is a section of flanging for connecting the second head 321 and the diversion section 3232. The flow-dividing section 3231 extends along the first direction, so that the flue gas split by the second head 321 can further flow along the flow-dividing section 3231 and further flow into a channel surrounded by the flange of the flow-guiding section 3232 and the flange of the second through hole 22 near one side of the flow-guiding section 3232.
It should be noted that, a second channel is disposed between the flow dividing section 3231 and the second through hole 22, the second channel gradually decreases along the first direction, a third channel is disposed between the flow dividing section 3232 and the edge of the second through hole 22, the widths of the third channels are the same, and the widths of the third channels are smaller than those of the second channel. The contact area of the flue gas and the heat exchange tube in the second through hole 22 is guaranteed, and the heat exchange effect is guaranteed.
Alternatively, the third flow channel width may be set to 2.5mm to ensure proper flow rate of the flue gas and proper heat exchange area and heat exchange time with the heat exchange tube. Of course, the values of the first preset distance and the second preset distance can be set by those skilled in the art according to actual needs, and are not specifically limited herein.
Preferably, the connection position of the diversion section 3232 and the diversion section 3231 is flush with the connecting line of the centers of the adjacent two second through holes 22. The flue gas split by the second head 321 and the split section 3231 firstly enters the second flow channel between the second split piece 32 and the second through hole 22, the second flow channel can have a wider flow width initially, then gradually decreases, and when flowing to the connecting line position of the circle centers of two adjacent second through holes 22, the flue gas is guided by the guide section 3232, and the contact area of the flue gas and the heat exchange tube in the second through hole 22 is ensured due to the inconvenient width of the third flow channel, so that the heat exchange effect is ensured.
As an alternative to a heat exchanger plate, the first through-hole 21 and/or the second through-hole 22 are provided as ovals, and the major axis of the ovals is parallel to the first direction. Accordingly, the cross section of the heat exchange tube disposed in the through hole is also set to be elliptical. So set up, be favorable to improving when flue gas flows along first direction, can have bigger heat transfer area with the heat exchange tube in the through-hole, and then improve heat exchange efficiency. Alternatively, the major axis of the ellipse may be set to 28.6mm and the minor axis may be set to 14.1mm.
Preferably, the heat exchanger plate body 1 is provided with a lightening hole 12, and the lightening hole 12 is disposed between the second through hole 22 and the first split member 31. By providing the lightening holes 12, it is advantageous to lighten the weight of the heat exchanger plates. Of course, in other embodiments, those skilled in the art may also optionally provide the lightening holes 12 at other positions of the heat exchanger plate body 1, so long as the flow of the flue gas is not affected, and the present utility model is not limited in detail.
The embodiment also discloses a gas water heater, including a plurality of heat exchange tubes and a plurality of heat exchanger plates of arbitrary scheme above, a plurality of heat exchanger plates stack each other, and the heat exchange tube wears to locate in the first through-hole 21 and the second through-hole 22 of a plurality of heat exchanger plates of stacking each other. The gas water heater provided with the heat exchange plates has good heat exchange effect and high heat exchange efficiency, can effectively avoid the damage of the heat exchange plates caused by local overheating, is safer and more reliable in the whole machine use process, and further has longer service life.
In the specific content of the above embodiment, any combination of the technical features may be performed without contradiction, and for brevity of description, all possible combinations of the technical features are not described, however, as long as there is no contradiction between the combinations of the technical features, they should be considered as the scope of the description.
The foregoing detailed description of the embodiments presents only a few embodiments of the present utility model, which are described in some detail and are not intended to limit the scope of the present utility model. It should be noted that it will be apparent to those skilled in the art that several variations and modifications can be made without departing from the spirit of the utility model, which are all within the scope of the utility model. Accordingly, the scope of protection of the present utility model is to be determined by the appended claims.
Claims (10)
1. Heat exchanger plate, its characterized in that includes:
a heat exchanger plate body (1) having an inlet side and an outlet side; the heat exchange plate body (1) is sequentially provided with a first through hole group and a second through hole group which are separated from each other along a first direction; the first via group includes a plurality of first vias (21) spaced apart along a second direction, and the second via group includes a plurality of second vias (22) spaced apart along the second direction; the first through holes (21) and the second through holes (22) are staggered in the second direction; the first direction is a direction from the air inlet side to the air outlet side, and the second direction is perpendicular to the first direction;
the first flow dividing piece (31) is connected with the heat exchange plate body (1) and is arranged between two adjacent first through holes (21); a kind of electronic device with high-pressure air-conditioning system
The second flow dividing piece (32) is connected to the heat exchange plate body (1) and arranged between two adjacent second through holes (22), and the second flow dividing piece (32) extends from between the first through holes (21) and the second through holes (22) to be parallel and level with the bottom end, away from one side of the first through hole group, of the second through holes (22).
2. Heat exchanger plate according to claim 1, wherein the first flow divider (31) and/or the second flow divider (32) are provided as flanging holes, the flanging of which is formed by bending the heat exchanger plate body (1).
3. Heat exchanger plate according to claim 1, wherein the first flow divider (31) is provided with a first head (311) and a first flank (312) in sequence along the first direction, the first head (311) is arranged between the connecting lines of the centers of two adjacent first through holes (21), and a first channel is arranged between the first flank (312) and the edge of the first through hole (21).
4. The heat exchange plate according to claim 1, wherein the second flow dividing member (32) is provided with a second head portion (321) and second side wings (323) provided on both sides of the second head portion (321) in the first direction, the second head portion (321) is provided between the first through hole (21) and the second through hole (22), and an end of the second side wing (323) away from the second head portion (321) extends to a bottom end of the second through hole (22) away from the first through hole group side.
5. The heat exchange plate according to claim 4, wherein the second flank (323) includes a diverting section (3231) and a diverting section (3232), and an end of the diverting section (3232) remote from the diverting section (3231) extends to a bottom end of the second through hole (22) remote from a side of the first through hole group.
6. The heat exchanger plate according to claim 5, wherein a second channel is provided between the flow dividing section (3231) and the second through hole (22), and a third channel is provided between the flow dividing section (3232) and the edge of the second through hole (22), the third channel having a width smaller than the width of the second channel.
7. A heat exchanger plate according to any one of claims 1-6, wherein the first through hole (21) and/or the second through hole (22) are provided as an oval shape, and the major axis of the oval shape is parallel to the first direction.
8. A heat exchanger plate according to any one of claims 1-6, wherein the heat exchanger plate body (1) is folded over on both sides in the first direction to form a smoke gathering flange (11).
9. A heat exchanger plate according to any one of claims 1-6, wherein the heat exchanger plate body (1) is provided with a lightening hole (12), the lightening hole (12) being arranged between the second through hole (22) and the first flow divider (31).
10. Gas water heater, characterized in that it comprises a heat exchange tube and a heat exchange plate according to any one of claims 1-9, said heat exchange tube being arranged in said first through hole (21) and in said second through hole (22).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202223540341.7U CN219284047U (en) | 2022-12-29 | 2022-12-29 | Heat exchange plate and gas water heater |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202223540341.7U CN219284047U (en) | 2022-12-29 | 2022-12-29 | Heat exchange plate and gas water heater |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN219284047U true CN219284047U (en) | 2023-06-30 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202223540341.7U Active CN219284047U (en) | 2022-12-29 | 2022-12-29 | Heat exchange plate and gas water heater |
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| Country | Link |
|---|---|
| CN (1) | CN219284047U (en) |
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2022
- 2022-12-29 CN CN202223540341.7U patent/CN219284047U/en active Active
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