CN215045159U - Seal-valve-free air sealing body - Google Patents
Seal-valve-free air sealing body Download PDFInfo
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- CN215045159U CN215045159U CN202121077239.0U CN202121077239U CN215045159U CN 215045159 U CN215045159 U CN 215045159U CN 202121077239 U CN202121077239 U CN 202121077239U CN 215045159 U CN215045159 U CN 215045159U
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Abstract
The utility model provides a no seal valve air seal body, belongs to air seal body technical field, including main intake duct, branch air flue and cavity, branch air flue through one-way circulation is connected between main intake duct and the cavity, the below of branch air flue is equipped with curved water conservancy diversion air flue, branch air flue passes through water conservancy diversion air flue and cavity intercommunication. The utility model discloses the no seal valve air seal who obtains can reduce the impact of air current to the valve membrane, and the protection valve membrane is indeformable, can also strengthen the airtight effect of valve membrane simultaneously.
Description
Technical Field
The utility model relates to an air seal body technical field, concretely relates to no seal valve air seal body.
Background
Most of traditional air sealing bodies are coated with heat-resistant layers and then are subjected to heat sealing to form air inlets of valves, but the mode is complex, more materials are needed, the operation is complex, and the traditional air sealing bodies are gradually eliminated. It is currently preferred to form one-way flow-through inflation valves without the need to apply a heat-resistant impression layer, such as those described in the 201610478707.2 patent, for example, for inflatable bladders of the no heat-resistant design, and such valves without the need to apply a heat-resistant layer are referred to in the industry as no-print valves.
At present, the atmoseal body of circulation on the market can apply hot seal point or intermittent broken line or the hot impression of pattern etc. in minute air flue below usually to make the passageway of minute air flue in the entering cavity narrow down, accelerate the gas flow rate, accomplish the laminating of the convenient valve membrane in rear simultaneously inflating, or close in order to do benefit to the valve including constituteing such as minute air flue, and then avoid the air leakage to be natural. However, the hot marks or the marks cause sharp points or sharp corners in the air passages, and air flow impact is easily generated at the sharp points or the sharp corners, so that impact is generated on the valve film or the valve, the valve is easily deformed, and even the valve film is broken, so that the sealing effect is greatly influenced. In addition, the sharp points or corners have extremely high requirements on temperature control of the hot stamp, once the temperature is not well controlled, adhesion failure or damage and scrapping can occur, for example, the temperature is slightly lower, adhesion between the valve film and the cavity film can not be caused, when the temperature is higher, the valve film and the cavity film are heated too high, the quality is affected, the valve film and the cavity film are easy to damage particularly when being impacted by air flow, and the requirements on position accuracy of the sharp points and corners are extremely high, so that the operation difficulty and the production cost are increased.
Therefore, how to make the airflow smooth, reduce the impact of the airflow on the valve membrane, and protect the valve membrane from deformation becomes a technical problem to be solved urgently in the field.
In addition, do not have gradual change between the main intake duct in the air seal body and the branch air flue in the existing market and handle or guide, the air current is smooth enough when flowing into branch air flue from main intake duct, leads to main intake duct to need to bear comparatively big atmospheric pressure, is unfavorable for the air current to get into and divides the air flue, and this also is the problem that needs improvement urgently.
SUMMERY OF THE UTILITY MODEL
In order to overcome the defects of the prior art, the utility model aims to provide a no seal valve air seal body can make the air current smoothly get into the cavity, reduces the impact of the air current to valve or valve membrane, and protects valve non-deformable.
The purpose of the utility model is realized through the following technical scheme:
the utility model provides a no seal valve air seal body, includes main intake duct, branch air flue and cavity, be connected through the branch air flue of one-way circulation between main intake duct and the cavity, the below of branch air flue is equipped with curved water conservancy diversion air flue, branch air flue passes through water conservancy diversion air flue and cavity intercommunication.
Further measures taken are: transversely laid a plurality of air flue partition portion between main intake duct and the cavity, interval between the air flue partition portion forms branch air flue, and adjacent two form big-end-up's throat between the top of air flue partition portion.
Further measures taken are: the necking is funnel-shaped.
Further measures taken are: the top of the air passage partition part is a convex arc with a high middle and two low sides.
Further measures taken are: and flaring with a small upper part and a big lower part is formed between the bottoms of the adjacent air passage partitions.
Further measures taken are: and both sides of the bottom of the air passage partition part are concave arcs with high outer sides and low middle parts.
Further measures taken are: a transition arc section is arranged between the top and the bottom of the air passage partition part
Further measures taken are: the branch air flue includes branch air inlet and branch air inlet chamber, branch air inlet and main intake duct intercommunication, branch air inlet is through branch air inlet chamber and water conservancy diversion air flue intercommunication, the width of branch air inlet chamber is greater than the width of branch air inlet, also is greater than the width of water conservancy diversion air flue.
Further measures taken are: the diversion air passage is S-shaped.
Further measures taken are: the main air inlet channel, the branch air inlet channel and the cavity are formed by hot pressing through two cavity membranes and two valve membranes; the two valve membranes are arranged between the two cavity body membranes;
two curved and uninterrupted guide lines are arranged below the branch air passage, and a guide air passage is formed between the two guide lines positioned below the same branch air passage.
Further measures taken are: the diversion line enables the two valve films to be adhered to one of the cavity films.
Further measures taken are: the top of the cavity body membrane is provided with a first heat sealing line used for adhering two cavity body membranes, a second heat sealing line is arranged below the first heat sealing line and comprises a breaking area and an air flue separating part which are arranged at intervals, the two valve membranes are completely adhered to the two cavity body membranes through the air flue separating part, a main air inlet channel is formed between the first heat sealing line and the second heat sealing line, the breaking area between the air flue separating parts forms an air inlet channel, the bottom of the air flue separating part is connected with a separating line extending downwards, a transversely extending closing line is arranged in a crossed mode with the bottom of the separating line, a cavity is formed between every two adjacent separating lines, and the bottom of the cavity is closed through the closing line;
the top end of the diversion line is connected with the air passage partition part through a partition line, and the bottom end of the diversion line extends to the bottom end of the valve membrane.
Further measures taken are: the air channel separation part is provided with a connecting line, the connecting line is intersected with the separation line, two ends of the connecting line are respectively connected with the top ends of the guide lines on two sides of the separation line, the connecting line and the guide lines on the two ends are integrally formed, the top ends of the guide lines are connected with the separation line through the connecting line, the top ends of the separation lines are connected with the bottom of the air channel separation part, and the air channel separation part is positioned between two adjacent separation lines and forms the air separation cavity from the air channel separation part to the connecting line.
Further measures taken are: and a third heat sealing line transversely extends along the middle of the air passage partition part, and the third heat sealing line enables the valve film to be adhered to the adjacent cavity film.
Further measures taken are: the third heat sealing line is in a continuously distributed strip shape, and the heat sealing area of the third heat sealing line continuously extends to the top end of the valve film from the second heat sealing line and completely covers the top end of the valve film.
Further measures taken are: the third heat-sealing lines comprise main lines and branch parts, and the main lines extend along the transverse direction and are connected with the second heat-sealing lines in series; one end of each branch part is connected with the main line, the other end of each branch part extends out towards the top end of the valve membrane, and the branch parts are distributed on the main line at intervals.
Compared with the prior art, the utility model discloses following beneficial effect has:
the utility model discloses a below at branch air flue sets up curved water conservancy diversion air flue, and branch air flue passes through water conservancy diversion air flue and cavity intercommunication for the air current that gets into behind the branch air flue can be through in the smooth and easy entering cavity of curved water conservancy diversion air flue. By adopting the curve type flow guide air passage, the soft curve is beneficial to the circulation of air flow, and the impact force of the air flow on the partial air inlet passage and the flow guide air passage or the whole air inlet valve is reduced, so that the valve is protected from being deformed easily, and the risk of air leakage is reduced; simultaneously curved water conservancy diversion air flue can not make sharp point or closed angle appear in the air flue, and produce great impact to sharp point or closed angle, and then lead to valve membrane easy damage, perhaps require highly to production operation, and curved water conservancy diversion air flue design, make whole lines smooth, be difficult to appear sharp point or closed angle, conveniently carry out the heat-seal impression, and require not so high to the accuracy of position, reduce the production degree of difficulty, thereby reach the protection including the inflation valve non-deformable of constituteing such as branch air flue, promote the effect of air current smooth and easy degree in the air flue.
Drawings
Fig. 1 is a schematic structural view of an embodiment of the present invention in an uninflated state;
FIG. 2 is an enlarged view taken at A in FIG. 1;
fig. 3 is a schematic structural diagram of one of the chambers in an inflated state according to an embodiment of the present invention;
fig. 4 is a schematic view of the overall structure of an embodiment of the present invention in an uninflated state;
fig. 5 is a schematic structural diagram of a third heat-sealing line according to an embodiment of the present invention;
fig. 6 is a schematic structural diagram of a third heat-sealing line according to an embodiment of the present invention;
fig. 7 is a schematic structural view of a third heat-sealing line according to an embodiment of the present invention;
wherein the arrows in fig. 4 indicate the intake direction of the airflow;
in the figure: 1. a primary air intake; 2. separating into an air channel; 201. an air inlet; 202. a sub-air inlet chamber; 3. a cavity; 4. a flow guide air passage; 5. an airway partition; 501. a concave arc; 502. a transition arc section; 6. a luminal membrane; 7. a valve membrane; 8. a diversion line; 801. a connecting wire; 9. a first heat seal line; 10. a second heat seal line; 1001. a breaking zone; 11. a separation line; 12. closing the line; 13. a third heat seal line; 1301. a main line; 1302. a branching section; 14. and (4) end heat sealing lines.
Detailed Description
The present invention will be described in further detail with reference to the following drawings and specific embodiments. In the present specification, the terms "upper", "inner", "middle", "left", "right" and "one" are used for convenience of description, and are not intended to limit the scope of the present invention, and the relative relationship between the terms and the corresponding parts may be changed or adjusted without substantial technical changes.
As shown in figure 1, a seal-free valve air sealing body comprises a main air inlet channel 1, a branch air channel 2 and a cavity 3, wherein the main air inlet channel 1 is connected with the cavity 3 through the branch air channel 2 which is in one-way circulation, a curve-shaped flow guide air channel 4 is arranged below the branch air channel 2, and the branch air channel 2 is communicated with the cavity 3 through the flow guide air channel 4.
Set up curved water conservancy diversion air flue 4 through the below at minute air flue 2, divide air flue 2 to communicate with cavity 3 through water conservancy diversion air flue 4 for the air current that gets into behind minute air flue 2 can be through the smooth and easy entering cavity 3 of curved water conservancy diversion air flue 4. By adopting the curve type guide air passage 4, the soft curve is beneficial to the circulation of air flow, and the impact force of the air flow on the partial air inlet passage 2 and the guide air passage 4 or the integral air inlet valve is reduced, so that the valve is protected from being deformed easily, and the risk of air leakage is reduced; curve type water conservancy diversion air flue 4, can not make sharp point or closed angle appear in the air flue, and produce great impact to sharp point or closed angle, and then lead to valve membrane 7 easy damaged, perhaps require highly to production operation, and curve type water conservancy diversion air flue 4 designs, make whole lines smooth, be difficult to the node appearing, conveniently carry out the heat-seal impression, and require not so high to the accuracy of position, the reduction production degree of difficulty, thereby reach the protection including the inflation valve non-deformable of constituteing such as branch air flue 2, promote the effect of air current smooth and easy degree in the air flue.
As shown in fig. 1 and 4, a plurality of air passage partitions 5 are transversely arranged between the main air inlet passage 1 and the cavity 3, the air passage partitions 5 form the sub air passages 2 at intervals, and a large-top and a small-bottom necking is formed between the tops of two adjacent air passage partitions 5. Compare in the branch inlet channel entry of traditional equal width, need great pressure when the air current of main intake duct 1 gets into branch air flue 2, and the distance between the top of this embodiment through two adjacent air flue partitions 5 reduces downwards gradually, is favorable to guiding the air current in the main intake duct 1 to get into branch air flue 2, and valve membrane 7 is also opened more easily to reduce the pressure that the air current got into branch air flue from main air flue, make the air get into branch air flue 2 more smoothly from main intake duct 1, conveniently aerify.
As shown in fig. 1-2, the necking is funnel-shaped, so that the air fluency is excellent and the inflation effect is better. Of course, the necking can be in other shapes, as shown in fig. 1-2, the top of the air passage partition part 5 is a convex arc with a high middle and two low sides, and the arc shape changes gradually, so that the air flow in the main air inlet passage 1 can enter the sub air inlet passage 2 more conveniently.
As shown in fig. 1-2 and 4, a flaring with a small top and a large bottom is formed between the bottoms of two adjacent air passage separating parts 5, which is beneficial to increasing the resistance of air flowing in and air flowing out, so that the air entering the air dividing air passage 2 is not easy to flow backwards, and the gradually increased space is convenient for storing air, so that the air can enter the cavity 3 through the air guiding air passage 4. The bottom both sides of air flue partition portion 5 are the concave arc 501 that the high centre in outside is low, adopt concave arc 501 design, block gas more easily, avoid getting into the gas refluence that divides air flue 2. Between the top and the bottom of the air duct partition 5 is a transition arc 502, which facilitates the air flow and avoids the impact of the air flow on the valve membrane 7.
As shown in fig. 1-2, 4, divide into air flue 2 including dividing into gas port 201 and dividing into air chamber 202, divide into gas port 201 and main intake duct 1 intercommunication, divide into gas port 201 through dividing into air chamber 202 and flow guide air flue 4 intercommunication, divide the width of dividing into air chamber 202 to be greater than the width that divides gas port 201, also be greater than the width of flow guide air flue 4 to can divide into the air chamber through the great space and carry out the gas storage. Through setting up branch gas chamber 202, conveniently store from the gas that divides gas port 201 inflow, be favorable to gas to get into in the cavity 3 through water conservancy diversion air flue 4 simultaneously. The water conservancy diversion air flue 4 is the S type, and crooked S type can make the smooth and easy effect of air current best, and the impact of the air current that significantly reduces to valve membrane 7 protects valve membrane 7 not to warp, makes valve membrane 7' S leakproofness stronger simultaneously, and is whole more withstand voltage, durable, and life is more permanent.
As shown in fig. 1-3, the main inlet duct 1, the branch inlet duct 2 and the cavity 3 are formed by hot pressing two cavity membranes 6 and two valve membranes 7; the two valve membranes 7 are arranged between the two cavity membranes 6; the below of branch air flue 2 is provided with two incessant water conservancy diversion lines 8 of bending, forms water conservancy diversion air flue 4 between two water conservancy diversion lines 8 that lie in same branch air flue 2 below, and water conservancy diversion line 8 makes two valve membranes 7 and 6 adhesions of one of them slice cavity body membrane to carry out certain degree bonding to valve membrane 7, fix on one of them slice cavity body membrane simultaneously, make aerify the airtight that carries out more easily of the back valve membrane that finishes, lift valve membrane 7's airtight effect.
As shown in fig. 1-4, a first heat-seal line 9 for adhering two cavity films 6 is arranged at the top of each cavity film 6, a second heat-seal line 10 is arranged below each first heat-seal line 9, each second heat-seal line 10 comprises a break area 1001 and an air channel partition part 5 which are arranged at intervals, the two valve films 7 and the two cavity films 6 are completely adhered through the air channel partition part 5, so that a main air inlet channel 1 is formed between the first heat-seal line 9 and the second heat-seal line 10, the break area 1001 between the air channel partition parts 5 forms a sub air channel 2, the bottom of the air channel partition part 5 is connected with a downward-extending partition line 11, a transversely-extending closed line 12 is arranged at the bottom of each partition line 11 in an intersecting manner, a cavity 3 is formed between two adjacent partition lines 11, and the bottom of the cavity 3 is closed through the closed line 12; the top end of the diversion line 8 is connected with the air passage partition part 5 through a partition line 11, and the bottom end of the diversion line 8 extends to the bottom end of the valve membrane 7, so that air can directly enter the cavity after flowing out of the diversion air passage 4 in the valve membrane 7.
As shown in fig. 1 to 4, a connecting line 801 is arranged below the air passage partition 5, the connecting line 801 intersects with the partition line 11, two ends of the connecting line 801 are respectively connected with the top ends of the flow guiding lines 8 at two sides of the partition line 11, the connecting line 801 is integrally formed with the flow guiding lines 8 at two ends so as to facilitate heat sealing, the top ends of the flow guiding lines 8 are connected with the partition line 11 through the connecting line 801, the top ends of the partition lines 11 are connected with the bottom of the air passage partition 5, and a sub air inlet cavity 202 is formed between two adjacent partition lines 11 and from the air passage partition 5 to the connecting line.
As shown in fig. 1 to 4, one end of the main air inlet 1 is provided with a terminal heat-seal line 14 for closing one end of the main air inlet 1, and the terminal heat-seal line 14 extends from the air passage partition portion 5 near one end of the main air inlet 1 to the top end of the cavity membrane 6, so as to facilitate the air inflation of the main air inlet 1; the top of the valve film 7 is provided with a third heat sealing line 13, and the third heat sealing line 13 enables the valve film 7 to be adhered to the adjacent cavity film 6; so that the valve membrane 7 is easier to open when the main inlet 1 is inflated.
As shown in fig. 4 and 5, a third heat-sealing line 13 is transversely arranged along the middle of the air passage partition part 5 in an extending manner, and the third heat-sealing line 13 enables the valve film 7 to be adhered to the adjacent cavity film 6, so that the valve film 7 can be conveniently opened and air can enter. The third heat-seal line 13 can also be arranged at the top of the valve film 7, so that the top of the valve film 7 is overlapped with the branch air inlet 201, air is conveniently introduced, and the heat-seal process can be reduced. Of course, the third heat-sealing line 13 may also be discontinuous, and the third heat-sealing line 13 may be disposed at intervals along the air duct partition portion 5, so that the hot-pressing area may be saved, wrinkles may be avoided, and the hot-pressing energy consumption may be saved.
As shown in fig. 6, one embodiment of the third heat-seal line 13 may be: the third heat-seal line 13 is in the form of a continuously distributed band, and the heat-seal area of the third heat-seal line 13 extends continuously from the second heat-seal line 10 to the top end of the valve film 7 and completely covers the top end of the valve film 7. By: the third heat sealing line 13 is in a continuously distributed strip shape and covers the top end of the valve film 7, so that heat sealing can be performed in one step, the steps are simplified, the heat sealing area is wide, the temperature is uniform, and the control is easy.
As shown in fig. 7, another embodiment of the third heat-seal line 13 may be: the third heat-seal line 13 comprises a main line 1301 and branch parts 1302, wherein the main line 1301 extends along the transverse direction and is connected with each second heat-seal line 10 in series; one end of each branch part 1302 is connected with the main line, and the other end extends towards the top end of the valve membrane 7, and a plurality of branch parts 1302 are distributed on the main line 1301 at intervals. The branch parts 1302 can adopt different shapes or patterns, the branch parts 1302 with different patterns are distributed on the main line 1301 at intervals and extend out towards the top end of the valve film 7, so that the top of the valve film 7 is heat-sealed, the branch parts 1302 are distributed on the main line 1301 at intervals, the heat-sealing area can be reduced, the phenomenon that the heat-sealing area is too large and wrinkles easily occurs is avoided, the heat-sealing heat quantity required to be used can be reduced, the heat-sealing loss is reduced, the heat energy is saved, and the environment friendliness is achieved.
During the use, aerify main intake duct 1, draw open valve membrane 7 behind the expansion of main intake duct 1 for branch air flue 2 is opened, and gaseous smooth entering cavity 3 behind branch air flue 2's entry and the water conservancy diversion air flue 4 of passing through, when aerifing the back that finishes, cavity 3 inflation, the gaseous extrusion valve membrane 7 in the cavity 3, make water conservancy diversion air flue 4 between the valve membrane 7 and branch air flue 2 close, thereby produce airtight effect, can be used for the transportation packing of product. Certainly, the utility model can be used for packing the product and then inflating the product.
The embodiment of the present invention is not limited to this, according to the above-mentioned content of the present invention, the common technical knowledge and the conventional means in the field are utilized, without departing from the basic technical idea of the present invention, the present invention can also make other modifications, replacements or combinations in various forms, all falling within the protection scope of the present invention.
Claims (13)
1. The utility model provides a no seal valve air seal body, includes main intake duct, branch air flue and cavity, branch air flue through one-way circulation is connected its characterized in that between main intake duct and the cavity: and a curve-shaped flow guide air passage is arranged below the branch air passage, and the branch air passage is communicated with the cavity through the flow guide air passage.
2. The valve-less air seal of claim 1, wherein: transversely laid a plurality of air flue partition portion between main intake duct and the cavity, interval between the air flue partition portion forms branch air flue, and adjacent two form big-end-up's throat between the top of air flue partition portion.
3. The valve-less air seal of claim 2, wherein: the necking is funnel-shaped, and the top of the air passage separating part is a convex arc with a high middle part and two low sides.
4. The valve-less air seal of claim 2, wherein: flaring with a small upper part and a large lower part is formed between the bottoms of the adjacent two air passage separating parts, and both sides of the bottom of each air passage separating part are concave arcs with high outer sides and low middle parts.
5. The valve-less air seal of claim 2, wherein: the branch air flue includes branch air inlet and branch air inlet chamber, branch air inlet and main intake duct intercommunication, branch air inlet is through branch air inlet chamber and water conservancy diversion air flue intercommunication, the width of branch air inlet chamber is greater than the width of branch air inlet, also is greater than the width of water conservancy diversion air flue.
6. The valve-less air seal of claim 5, wherein: the diversion air passage is S-shaped.
7. The valve-less air seal of claim 5, wherein: the main air inlet channel, the branch air inlet channel and the cavity are formed by hot pressing through two cavity membranes and two valve membranes; the two valve membranes are arranged between the two cavity body membranes;
two curved and uninterrupted guide lines are arranged below the branch air passage, and a guide air passage is formed between the two guide lines positioned below the same branch air passage.
8. The valve-less air seal of claim 7, wherein: the diversion line enables the two valve films to be adhered to one of the cavity films.
9. The valve-less air seal of claim 7, wherein: the top of the cavity body membrane is provided with a first heat sealing line used for adhering two cavity body membranes, a second heat sealing line is arranged below the first heat sealing line and comprises a breaking area and an air flue separating part which are arranged at intervals, the two valve membranes are completely adhered to the two cavity body membranes through the air flue separating part, a main air inlet channel is formed between the first heat sealing line and the second heat sealing line, the breaking area between the air flue separating parts forms an air inlet channel, the bottom of the air flue separating part is connected with a separating line extending downwards, a transversely extending closing line is arranged in a crossed mode with the bottom of the separating line, a cavity is formed between every two adjacent separating lines, and the bottom of the cavity is closed through the closing line;
the top end of the diversion line is connected with the air passage partition part through a partition line, and the bottom end of the diversion line extends to the bottom end of the valve membrane.
10. The valve-less air seal of claim 9, wherein: the air channel separation part is provided with a connecting line, the connecting line is intersected with the separation line, two ends of the connecting line are respectively connected with the top ends of the guide lines on two sides of the separation line, the connecting line and the guide lines on the two ends are integrally formed, the top ends of the guide lines are connected with the separation line through the connecting line, the top ends of the separation lines are connected with the bottom of the air channel separation part, and the air channel separation part is positioned between two adjacent separation lines and forms the air separation cavity from the air channel separation part to the connecting line.
11. The valve-less air seal of claim 9, wherein: and a third heat sealing line transversely extends along the middle of the air passage partition part, and the third heat sealing line enables the valve film to be adhered to the adjacent cavity film.
12. The valve-less air seal of claim 11, wherein: the third heat sealing line is in a continuously distributed strip shape, and the heat sealing area of the third heat sealing line continuously extends to the top end of the valve film from the second heat sealing line and completely covers the top end of the valve film.
13. The valve-less air seal of claim 11, wherein: the third heat-sealing lines comprise main lines and branch parts, and the main lines extend along the transverse direction and are connected with the second heat-sealing lines in series; one end of each branch part is connected with the main line, the other end of each branch part extends out towards the top end of the valve membrane, and the branch parts are distributed on the main line at intervals.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121077239.0U CN215045159U (en) | 2021-05-19 | 2021-05-19 | Seal-valve-free air sealing body |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121077239.0U CN215045159U (en) | 2021-05-19 | 2021-05-19 | Seal-valve-free air sealing body |
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| Publication Number | Publication Date |
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| CN215045159U true CN215045159U (en) | 2021-12-07 |
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| CN202121077239.0U Active CN215045159U (en) | 2021-05-19 | 2021-05-19 | Seal-valve-free air sealing body |
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| CN (1) | CN215045159U (en) |
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- 2021-05-19 CN CN202121077239.0U patent/CN215045159U/en active Active
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