CN211381893U - Gas-liquid mixing tooth sprayer - Google Patents
Gas-liquid mixing tooth sprayer Download PDFInfo
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- CN211381893U CN211381893U CN201921780035.6U CN201921780035U CN211381893U CN 211381893 U CN211381893 U CN 211381893U CN 201921780035 U CN201921780035 U CN 201921780035U CN 211381893 U CN211381893 U CN 211381893U
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Abstract
The utility model discloses a gas-liquid mixing tooth sprayer, which comprises a machine body and a nozzle pipe, wherein the nozzle pipe is clamped with the machine body, the machine body comprises a shell, an air pump, a water pump, a battery, a water storage tank and a connecting structure are arranged in the shell, a water inlet of the water pump is communicated with a water supply port of the water storage tank, and a water outlet of the water pump is communicated with a water supply port on the connecting structure; the air outlet of the air pump is communicated with the air vent on the connecting structure, the air vent is communicated with the nozzle pipe, and the water through port is communicated with the nozzle pipe. The utility model provides a tooth ware is spouted in gas-liquid mixture has and spouts the portable light of tooth ware, can mix the gas-liquid, and the fluid after mixing is washed tooth, and it is better to wash tooth effect, through adjusting the flow of water pump and air pump, just can adjust the proportion of gas-liquid mixture in the use, satisfies advantages such as different demands.
Description
Technical Field
The utility model belongs to the technical field of clean tooth, the clean apparatus of tooth protection technique and specifically relates to a portable gas-liquid mixture towards tooth ware is related to.
Background
The existing tooth flushing device basically uses single liquid for flushing teeth, and because the liquid needs practical high-pressure liquid for flushing the teeth, the high-pressure liquid has larger impact force and can cause discomfort. Meanwhile, the single liquid is large in water quantity demand for tooth rinsing, and waste of tooth rinsing liquid is caused. Particularly, in the portable tooth flusher, since the liquid needs to be mounted on the tooth flusher in advance, the volume of the liquid storage box needs to be increased inevitably when the liquid is too much, and the portable tooth flusher is too large. If the volume of the liquid storage box of the tooth flushing device is not increased, the liquid needs to be replaced frequently, and the operation is inconvenient. Therefore, the urgent need of development a gas-liquid mixture towards tooth nozzle makes towards tooth liquid can with gas mixture, reduces the waste towards tooth liquid, can reduce the volume of the stock solution box of portable towards tooth ware simultaneously, further increases the portability of portable towards tooth ware, and simultaneously, the gas-liquid mixture is better to the washing effect of tooth, and the washing process is more comfortable.
Chinese patent application publication No. CN204744469U, the publication date is 11/2015, and the name is "portable tooth-washing device", and it discloses provides a portable tooth-washing device that can wirelessly charge, including the fuselage subassembly, with nozzle and embedding that the fuselage subassembly top is connected the water tank of fuselage subassembly one side, the fuselage subassembly include the casing inside pump assembly, motor, rechargeable battery and the circuit control panel of casing, the pump assembly with motor drive cooperation, motor and rechargeable battery all with circuit control panel circuit connection, its characterized in that: the portable tooth flushing device further comprises a wireless charging base, a mounting groove for the machine body assembly to be mounted in a matched mode is formed in the wireless charging base, a wireless charging transmitter and an external power supply wiring are arranged in the wireless charging base, and a wireless charging receiver is arranged in the machine body assembly. However, the tooth irrigator still uses a single liquid, and the problems still exist.
Disclosure of Invention
The utility model discloses an overcome among the prior art liquid towards tooth ware, the liquid use amount is too big, and dashes the not enough of comfortable mitigateing inadequately of tooth fluid, provides a gas-liquid mixture and spouts tooth ware, has and dashes the portable light of tooth ware, can mix the gas-liquid, and the fluid after the mixture dashes the tooth, and it is better to dash the tooth effect, through regulating water pump and air pump's flow, just can adjust the proportion of gas-liquid mixture in the use, satisfies advantages such as different demands.
In order to achieve the above purpose, the utility model adopts the following technical scheme:
a gas-liquid mixing tooth sprayer comprises a machine body and a nozzle pipe, wherein the nozzle pipe is clamped with the machine body, the machine body comprises a shell, an air pump, a water pump, a battery, a water storage tank and a connecting structure are arranged in the shell, a water inlet of the water pump is communicated with a water supply opening of the water storage tank, and a water outlet of the water pump is communicated with a water through opening on the connecting structure; the air outlet of the air pump is communicated with the air vent on the connecting structure, the air vent is communicated with the nozzle pipe, and the water through port is communicated with the nozzle pipe.
Among the above-mentioned technical scheme, water pump and air pump are supplied energy by the battery, provide gas and liquid respectively, and gas and liquid get into connection structure and get into nozzle pipe after the mixture, form gas-liquid mixture. The water consumption when the gas-liquid mixture dashes tooth is far less than the water consumption when liquid dashes tooth, can reduce the use amount of dashing tooth liquid, reduces the volume of storage water tank, and it is portable light to dash the tooth ware, and the gas-liquid mixture is comfortable better when dashing tooth, and is littleer to the tooth damage. By adjusting the flow of the water pump and the air pump, the proportion of gas-liquid mixing can be adjusted in the using process, and different requirements are met. The gas-liquid mixture can be used for washing teeth to prevent gingival bleeding, swelling and pain, root and surface caries and periodontal disease, and can be used in combination with halitosis removing toothpaste to achieve fresh and natural oral cavity.
Preferably, the connecting structure comprises a connecting cavity tube, a push rod and a telescopic spring, the connecting cavity tube is fixed with the shell, the push rod is connected with the shell in a sliding manner, one end of the telescopic spring is connected with the push rod, and the other end of the telescopic spring is connected with the push rod; the connecting cavity pipe is internally provided with a cavity, the air vent and the water through port are arranged on the connecting cavity pipe and communicated with the cavity, one end of the nozzle pipe is flatly inserted into the cavity in a manner of being matched with the cavity, the push rod is provided with a clamping part, and the clamping part penetrates through the connecting cavity pipe to extend into the cavity and is clamped into a connecting ring groove on the nozzle pipe.
The connecting structure can connect the nozzle pipe with the machine body, and gas and liquid in the machine body after connection can enter the nozzle pipe through the connecting structure and then are sprayed out after being mixed in the nozzle pipe. The connecting structure can ensure that the nozzle pipe can rotate on the machine body by 360 degrees, the outlet orientation of the nozzle pipe can be adjusted as required, and the convenience of the use of the tooth flushing device is ensured. And the nozzle pipe can be quickly disassembled and assembled with the machine body, and when the nozzle pipe needs to be disassembled and assembled, the nozzle pipe can be taken out only by pushing the push rod to separate the clamping part from the connecting ring groove of the nozzle pipe.
Preferably, the nozzle pipe is internally provided with an air guide cavity and a water guide cavity, the air vent is communicated with the air guide cavity, and the water vent is communicated with the water guide cavity. The structure can ensure that the air vent and the water vent on the connecting structure can be respectively communicated with the air guide cavity and the water guide cavity, so that the gas and the liquid can be mixed in a specific form at a specific position of the nozzle pipe according to the requirement.
Preferably, the water passage port is provided on an end surface of the connecting chamber tube, and the vent port is provided on a side wall of the connecting chamber tube. The structure can ensure that the air vent and the water vent on the connecting structure can be respectively communicated with the air guide cavity and the water guide cavity, and can meet the requirement of the nozzle pipes which are arranged in the corresponding mode of the air guide cavity and the water guide cavity. The water through hole is arranged in the center of the end face of the connecting cavity tube, a communicating ring groove is arranged on the inner side wall of the connecting cavity tube, the communicating ring groove is communicated with the vent hole, and the air guide cavity is communicated with the communicating ring groove; at the moment, even if the nozzle pipe is rotated, the water guide cavity on the nozzle pipe is always communicated with the water through opening, and the air guide cavity is always communicated with the communicating ring groove, so that the gas-liquid channel is always communicated when the nozzle pipe rotates on the machine body by 360 degrees. The positions of the air vent and the water vent can be interchanged.
Preferably, the water passage port and the vent port are provided on an end surface of the connecting lumen. The structure can ensure that the air vent and the water vent on the connecting structure can be respectively communicated with the air guide cavity and the water guide cavity, and can meet the requirement of the nozzle pipes which are arranged in the corresponding mode of the air guide cavity and the water guide cavity. The nozzle pipe and the connecting cavity pipe are provided with positioning structures (such as positioning bulges and grooves) to ensure that the nozzle pipe can be installed at a specific angle and ensure that the air vent and the water through port can be respectively aligned and communicated with the air guide cavity and the water guide cavity.
Preferably, the water through port is arranged at the center of the end face of the connecting cavity pipe, and the vent port is arranged at the eccentric position of the end face of the connecting cavity pipe. The structure can ensure that the air vent and the water vent on the connecting structure can be respectively communicated with the air guide cavity and the water guide cavity, and can meet the requirement of the nozzle pipes which are arranged in the corresponding mode of the air guide cavity and the water guide cavity. The air guide cavity on the nozzle pipe is annularly arranged outside the water guide cavity, and the air guide cavity and the water guide cavity are isolated. At the moment, even if the nozzle pipe is rotated, the water guide cavity on the nozzle pipe is always communicated with the water through opening, and the annular air guide cavity is always communicated with the air through opening, so that the air-liquid channel is always communicated when the nozzle pipe rotates on the machine body by 360 degrees. The positions of the air vent and the water vent can be interchanged.
Preferably, the end face of the water through hole in the cavity is provided with a sealing ring groove; the end surface of the vent in the cavity is provided with a sealing ring groove; a sealing ring is arranged in the sealing ring groove. The structure can ensure the tightness when the communicating air port and the water through port can be respectively communicated with the air guide cavity and the water guide cavity, and avoid the leakage of gas and liquid.
Preferably, the machine body is provided with an adjusting switch, and the switch can independently control the opening and the size of the water pump and the air pump. The switch can adjust the flow of water pump and air pump, can adjust the proportion of gas-liquid mixture in the use, satisfies different demands.
Preferably, a positioning block is arranged on the push rod. The limit position of the push rod can be limited, and damage caused by the push rod exceeding the limit position is avoided.
Preferably, a water pressing hose is arranged in the water storage tank, one end of the water pressing hose is communicated with the water supply opening, and a balancing weight is arranged at the other end of the water pressing hose. The structure can make the hydrophilic one end of pressurized-water hose be located the relative bottom of storage water tank all the time, even the fuselage is invertd, the balancing weight also can make the hydrophilic one end of pressurized-water hose descend, makes the hydrophilic one end of pressurized-water hose be in liquid bottom all the time, guarantees that the liquid is internal to be pressed out by gas.
Preferably, a telescopic spring is arranged in the water storage tank and sleeved outside the water pressing hose. The spring is sleeved outside the water pressing hose, so that the liquid channel of the water pressing hose which is bent and inverted excessively can be prevented from being blocked, and the liquid outlet effect is ensured.
Preferably, the tooth flushing device circuit board is also provided with an intelligent tooth flushing time control device to meet different time requirements. Unique music and song design are switched on and off, so that the tooth washing machine is more interesting.
The utility model has the advantages that: (1) the tooth flushing device is portable and portable; (2) the gas and the liquid can be mixed, and the mixed fluid is used for flushing teeth, so that the tooth flushing effect is better; (3) the gas-liquid mixing proportion can be adjusted in the using process by adjusting the flow of the water pump and the air pump, so that different requirements are met; (4) the nozzle pipe and the machine body can be quickly assembled and disassembled; (5) the nozzle pipe can rotate around the machine body for 360 degrees; (6) different positions of the air vent and the water vent can be arranged according to requirements.
Drawings
Fig. 1 is a schematic structural diagram of the present invention;
FIG. 2 is an enlarged view of a portion of FIG. 1 at A;
FIG. 3 is a schematic structural view of example 2;
FIG. 4 is a schematic structural view of example 4.
In the figure: the device comprises a machine body 1, a nozzle pipe 2, a connecting ring groove 2.1, an air guide cavity 2.2, a water guide cavity 2.3, a shell 3, an air pump 4, a water pump 5, a battery 6, a water storage tank 7, a water supply opening 7.1, a connecting structure 8, a connecting cavity pipe 8.1, an air vent 8.1.1, a water through opening 8.1.2, a cavity 8.1.3, a push rod 8.2, a clamping part 8.2.1, a telescopic spring 8.3, a positioning block 8.4, an adjusting switch 9, a water pressing hose 10, a balancing weight 11 and a second spring 12.
Detailed Description
The invention is further described with reference to the accompanying drawings and specific embodiments.
Example 1:
as shown in fig. 1 and 2, a gas-liquid mixing tooth sprayer comprises a machine body 1 and a nozzle pipe 2, wherein the nozzle pipe 2 is clamped with the machine body 1, the machine body 1 comprises a shell 3, an air pump 4, a water pump 5, a battery 6, a water storage tank 7 and a connecting structure 8 are arranged in the shell 3, the connecting structure 8 comprises a connecting cavity pipe 8.1, a push rod 8.2 and a telescopic spring 8.3, the connecting cavity pipe 8.1 is fixed with the shell 3, the push rod 8.2 is in sliding connection with the shell 3, one end of the telescopic spring 8.3 is connected with the push rod 8.2, and the other end of the telescopic spring 8.3 is connected with the push rod 8.2; a cavity 8.1.3 is arranged in the connecting cavity tube 8.1, a vent hole 8.1.1 and a water through hole 8.1.2 which are communicated with the cavity 8.1.3 are arranged on the connecting cavity tube 8.1, one end of the nozzle tube 2 is adapted to the cavity 8.1.3 and is inserted into the cavity 8.1.3, a clamping part 8.2.1 and a positioning block 8.4 are arranged on the push rod 8.2, and the clamping part 8.2.1 penetrates through the connecting cavity tube 8.1 to extend into the cavity 8.1.3 and is clamped into a connecting ring groove 2.1 on the nozzle tube 2; the water inlet of the water pump 5 is communicated with the water supply port 7.1 of the water storage tank 7, and the water outlet of the water pump 5 is communicated with the water through port 8.1.2; the air outlet of the air pump 4 is communicated with the air vent 8.1.1, the air vent 8.1.1 is communicated with the nozzle pipe 2, and the water vent 8.1.2 is communicated with the nozzle pipe 2. The end surface of the water through opening 8.1.2 in the cavity 8.1.3 is provided with a sealing ring groove; the end face of the vent 8.1.1 in the cavity 8.1.3 is provided with a sealing ring groove; a sealing ring is arranged in the sealing ring groove. The machine body 1 is provided with an adjusting switch 9 which can independently control the opening and the size of the water pump 5 and the air pump 4.
In the technical scheme, the water pump 5 and the air pump 4 are powered by the battery 6 and respectively provide gas and liquid, and the gas and the liquid enter the connecting structure 8 and then enter the nozzle pipe 2 to be mixed to form a gas-liquid mixture. The water consumption when the gas-liquid mixture dashes tooth is far less than the water consumption when liquid dashes tooth, can reduce the use amount of dashing tooth liquid, reduces the volume of storage water tank 7, and it is portable light to dash the tooth ware, and the gas-liquid mixture is more comfortable when dashing tooth, and is littleer to the tooth damage. By adjusting the flow of the water pump 5 and the air pump 4, the gas-liquid mixing proportion can be adjusted in the using process, and different requirements are met. The connecting structure 8 can connect the nozzle pipe 2 with the machine body 1, and after the connection, gas and liquid in the machine body 1 can enter the nozzle pipe 2 through the connecting structure 8 and then are mixed in the nozzle pipe 2 and then are sprayed out. The connecting structure 8 can ensure that the nozzle pipe 2 can rotate on the machine body 1 for 360 degrees, the outlet orientation of the nozzle pipe 2 can be adjusted as required, and the convenience of the use of the tooth flushing device is ensured. And the nozzle pipe 2 can be quickly disassembled and assembled with the machine body 1, when the nozzle pipe is required to be disassembled and assembled, the push rod 8.2 is only required to be pushed, the clamping part 8.2.1 is separated from the connecting ring groove 2.1 of the nozzle pipe 2, and the nozzle pipe can be taken out.
Example 2:
as shown in fig. 3, on the basis of embodiment 1, an air guide cavity 2.2 and a water guide cavity 2.3 are arranged in the nozzle tube 2, an air vent 8.1.1 is communicated with the air guide cavity 2.2, and a water vent 8.1.2 is communicated with the water guide cavity 2.3; the water through hole 8.1.2 is arranged at the central position of the end face of the connecting cavity tube 8.1, the vent hole 8.1.1 is arranged on the side wall of the connecting cavity tube 8.1, the inner side wall of the connecting cavity tube 8.1 is provided with a communicating ring groove, the communicating ring groove is communicated with the vent hole 8.1.1, and the air guide cavity 2.2 is communicated with the communicating ring groove.
According to the technical scheme, the air vent 8.1.1 and the water vent 8.1.2 on the connecting structure 8 can be respectively communicated with the air guide cavity 2.2 and the water guide cavity 2.3, so that gas and liquid can be mixed in a specific form at a specific position of the nozzle pipe 2 according to requirements. At the moment, even if the nozzle pipe 2 is rotated, the water guide cavity 2.3 on the nozzle pipe 2 is always communicated with the water through opening 8.1.2, and the water guide cavity 2.2 is always communicated with the communicating ring groove, so that the gas-liquid channel is always communicated when the nozzle pipe 2 rotates on the machine body 1 by 360 degrees.
Example 3:
as shown in fig. 2, on the basis of embodiment 1, an air guide cavity 2.2 and a water guide cavity 2.3 are arranged in the nozzle pipe 2, an air vent 8.1.1 is communicated with the air guide cavity 2.2, and a water vent 8.1.2 is communicated with the water guide cavity 2.3; the water through port 8.1.2 and the vent port 8.1.1 are arranged on the end face of the connecting cavity pipe 8.1; the nozzle pipe 2 is provided with a positioning bulge, and the connecting cavity pipe 8.1 is provided with a positioning groove matched with the positioning bulge.
The technical scheme can ensure that the air vent 8.1.1 and the water vent 8.1.2 on the connecting structure 8 can be respectively communicated with the air guide cavity 2.2 and the water guide cavity 2.3, and can meet the requirement of the nozzle pipe 2 in which the air guide cavity 2.2 and the water guide cavity 2.3 are correspondingly arranged. The positioning structure can ensure that the nozzle pipe 2 is installed at a specific angle, and ensure that the air vent 8.1.1 and the water vent 8.1.2 can be respectively aligned and communicated with the air guide cavity 2.2 and the water guide cavity 2.3.
Example 4:
as shown in fig. 4, on the basis of embodiment 1, an air guide cavity 2.2 and a water guide cavity 2.3 are arranged in the nozzle tube 2, an air vent 8.1.1 is communicated with the air guide cavity 2.2, and a water vent 8.1.2 is communicated with the water guide cavity 2.3; the water through port 8.1.2 is arranged in the center of the end face of the connecting cavity tube 8.1, and the vent port 8.1.1 is arranged at the eccentric position of the end face of the connecting cavity tube 8.1. The air guide cavity 2.2 on the nozzle pipe 2 is annularly arranged outside the water guide cavity 2.3, and the two are isolated.
The technical scheme can ensure that the air vent 8.1.1 and the water vent 8.1.2 on the connecting structure 8 can be respectively communicated with the air guide cavity 2.2 and the water guide cavity 2.3, and can meet the requirement of the nozzle pipe 2 in which the air guide cavity 2.2 and the water guide cavity 2.3 are correspondingly arranged. Even if the nozzle pipe 2 is rotated, the water guide cavity 2.3 on the nozzle pipe 2 is always communicated with the water through opening 8.1.2, and the annular air guide cavity 2.2 is always communicated with the air through opening 8.1.1, so that the air-liquid channel is always communicated when the nozzle pipe 2 rotates on the machine body 1 for 360 degrees.
Example 5:
as shown in fig. 1, on the basis of embodiment 1, a water pressing hose 10 and an expansion spring 8.3 are arranged in the water storage tank 7, the expansion spring 8.3 is sleeved outside the water pressing hose 10, one end of the water pressing hose 10 is communicated with a water supply port 7.1, and the other end of the water hose is provided with a balancing weight 11. The structure can make the one end that pressurized-water hose 10 absorbs water be located the relative bottom of storage water tank 7 all the time, even fuselage 1 inverts, balancing weight 11 also can make the one end that pressurized-water hose 10 absorbs water drop down, makes the one end that pressurized-water hose 10 absorbs water be in liquid bottom all the time, guarantees that the internal quilt gas of liquid extrudes. The spring is sleeved outside the water pressing hose 10, so that the liquid channel of the water pressing hose 10 which is bent and inverted excessively can be prevented from being blocked, and the liquid outlet effect can be ensured.
The utility model has the advantages that: the tooth flushing device is portable and portable; the gas and the liquid can be mixed, and the mixed fluid is used for flushing teeth, so that the tooth flushing effect is better; the gas-liquid mixing proportion can be adjusted in the using process by adjusting the flow rates of the water pump 5 and the air pump 4, so that different requirements are met; the nozzle pipe and the machine body 1 can be quickly assembled and disassembled; the nozzle tube may rotate 1360 ° around the fuselage; different positions of the air vent 8.1.1 and the water vent 8.1.2 can be arranged according to requirements.
Claims (10)
1. A gas-liquid mixing tooth sprayer comprises a machine body and a nozzle pipe, wherein the nozzle pipe is clamped with the machine body; the air outlet of the air pump is communicated with the air vent on the connecting structure, the air vent is communicated with the nozzle pipe, and the water through port is communicated with the nozzle pipe.
2. The gas-liquid mixing tooth sprayer according to claim 1, wherein the connecting structure comprises a connecting cavity tube, a push rod and a telescopic spring, the connecting cavity tube is fixed with the shell, the push rod is slidably connected with the shell, one end of the telescopic spring is connected with the push rod, and the other end of the telescopic spring is connected with the push rod; the connecting cavity pipe is internally provided with a cavity, the air vent and the water through port are arranged on the connecting cavity pipe and communicated with the cavity, one end of the nozzle pipe is flatly inserted into the cavity in a manner of being matched with the cavity, the push rod is provided with a clamping part, and the clamping part penetrates through the connecting cavity pipe to extend into the cavity and is clamped into a connecting ring groove on the nozzle pipe.
3. The gas-liquid mixing dental sprayer of claim 2, wherein the nozzle tube has a gas conducting chamber and a water conducting chamber therein, the gas conducting port being in communication with the gas conducting chamber and the water conducting port being in communication with the water conducting chamber.
4. The gas-liquid mixing dental sprayer according to claim 3, wherein the water passage port is provided on an end surface of the connecting chamber tube, and the air passage port is provided on a side wall of the connecting chamber tube.
5. The gas-liquid mixing dental sprayer as claimed in claim 3, wherein the water port and the vent are provided on an end surface of the connecting chamber tube.
6. The gas-liquid mixing dental sprayer according to claim 3, wherein the water port is provided at the center of the end surface of the connecting cavity tube, and the air port is provided at an eccentric position of the end surface of the connecting cavity tube.
7. A gas-liquid mixing tooth sprayer according to claim 3, 4, 5 or 6, wherein the end face of the water through hole in the cavity is provided with a sealing ring groove; the end surface of the vent in the cavity is provided with a sealing ring groove; a sealing ring is arranged in the sealing ring groove.
8. The gas-liquid mixing tooth sprayer according to claim 1, 2, 3, 4, 5 or 6, wherein the machine body is provided with an adjusting switch, and the switch can independently control the opening and the size of the water pump and the air pump.
9. The gas-liquid mixing dental sprayer according to claim 2, 3, 4, 5 or 6, wherein the push rod is provided with a positioning block.
10. The gas-liquid mixing tooth sprayer according to claim 1, wherein a water-pressing hose and a telescopic spring are arranged in the water storage tank, one end of the water-pressing hose is communicated with the water supply port, and the other end of the water-pressing hose is provided with a balancing weight; the telescopic spring is sleeved outside the water pressing hose.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921780035.6U CN211381893U (en) | 2019-10-22 | 2019-10-22 | Gas-liquid mixing tooth sprayer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921780035.6U CN211381893U (en) | 2019-10-22 | 2019-10-22 | Gas-liquid mixing tooth sprayer |
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| Publication Number | Publication Date |
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| CN211381893U true CN211381893U (en) | 2020-09-01 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201921780035.6U Active CN211381893U (en) | 2019-10-22 | 2019-10-22 | Gas-liquid mixing tooth sprayer |
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| CN (1) | CN211381893U (en) |
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2019
- 2019-10-22 CN CN201921780035.6U patent/CN211381893U/en active Active
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