CN215626820U - Carbon dioxide generates device and refrigerator - Google Patents
Carbon dioxide generates device and refrigerator Download PDFInfo
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- CN215626820U CN215626820U CN202121575045.3U CN202121575045U CN215626820U CN 215626820 U CN215626820 U CN 215626820U CN 202121575045 U CN202121575045 U CN 202121575045U CN 215626820 U CN215626820 U CN 215626820U
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Abstract
The utility model provides a carbon dioxide generating device and a refrigerator, wherein a reaction container defines a first reaction chamber and a second reaction chamber which respectively contain a first reactant and a second reactant, wherein at least the first reactant exists in a liquid form, one end of a liquid inlet pipeline extends into the bottom of the first reaction chamber, and the other end of the liquid inlet pipeline extends into the second reaction chamber, so that the first reactant flows into the second reaction chamber through a liquid inlet pipeline under the action of the pressure difference of the first reaction chamber and the second reaction chamber to react with the second reactant to generate carbon dioxide, the generation of the carbon dioxide can be controlled according to needs, and the generation amount of the carbon dioxide is controllable.
Description
Technical Field
The utility model relates to the technical field of refrigerator preservation, in particular to a carbon dioxide generation device and a refrigerator.
Background
At present, a carbon dioxide supply device adopted by a refrigerator for fresh keeping is generally used for directly adding reactants to react to generate carbon dioxide, so that the generation amount of the carbon dioxide is uncontrollable, the pressure is unstable, and danger is easily caused.
SUMMERY OF THE UTILITY MODEL
An object of the present invention is to provide a carbon dioxide generator with a controllable amount of carbon dioxide generated.
A further object of the present invention is to prevent carbon dioxide back-suction.
Another further object of the present invention is to provide a refrigerator capable of automatically keeping fresh for a long time.
In particular, the present invention provides a carbon dioxide generating apparatus comprising:
a reaction vessel defining a first and a second closed reaction chamber containing a first and a second reactant, respectively, wherein at least the first reactant is present in liquid form;
one end of the liquid inlet pipeline extends into the bottom of the first reaction chamber, the other end of the liquid inlet pipeline extends into the second reaction chamber,
the first reactant flows to the second reaction chamber through the liquid inlet pipeline under the action of the pressure difference between the first reaction chamber and the second reaction chamber to react with the second reactant to generate carbon dioxide.
Optionally, a first check valve is disposed on the liquid inlet pipeline, and the first reactant in the first reaction chamber flows to the second reaction chamber through the liquid inlet pipeline and the first check valve.
Optionally, an air inlet pipeline is arranged on the side wall of the first reaction chamber; and
the device also comprises an air pump which is arranged outside the reaction container, is opposite to the air inlet pipeline and is configured to convey air to the first reaction chamber through the air inlet pipeline so as to pressurize the first reaction chamber to generate pressure difference between the first reaction chamber and the second reaction chamber.
Optionally, a second check valve is disposed on the air inlet pipeline, and the air generated by the air pump flows to the first reaction chamber through the air inlet pipeline and the second check valve.
Optionally, an air outlet pipeline is arranged on the side wall of the second reaction chamber, and a third check valve is arranged on the air outlet pipeline.
Optionally, the apparatus further comprises:
the external gas pipeline comprises a gas inlet and at least one gas outlet communicated with the gas inlet, and the gas inlet is communicated with the gas outlet pipeline;
and the airflow distribution device is arranged on the external air pipeline and is configured to selectively enable the air inlet to be communicated with any one of the air outlets.
Optionally, the air inlet of the external air pipeline is communicated with the air outlet pipeline through a pressure reducing valve.
Optionally, the apparatus further comprises:
and the pressure relief pipeline is provided with a first end and a second end, the first end is communicated with the second reaction chamber, the second end is communicated with the outside of the reaction container, and the pressure relief pipeline is configured to be communicated when the pressure of the second reaction chamber exceeds a preset pressure value so as to reduce the pressure of the second reaction chamber.
According to another aspect of the utility model, there is also provided a refrigerator, which includes:
a housing defining a refrigeration compartment;
the carbon dioxide generator according to any one of the above claims, provided in the refrigerating compartment.
Optionally, the refrigerating compartment is divided into a plurality of closed refrigerating spaces, and at least one air outlet of the external air pipeline of the carbon dioxide generating device is respectively communicated with different refrigerating spaces; and
and a second end of a pressure relief pipeline of the carbon dioxide generation device is communicated with the outside of the refrigerator.
According to the utility model, the reaction container defines a first closed reaction chamber and a second closed reaction chamber which are used for respectively containing a first reactant and a second reactant, wherein at least the first reactant exists in a liquid form, one end of the liquid inlet pipeline extends into the bottom of the first reaction chamber, and the other end of the liquid inlet pipeline extends into the second reaction chamber, so that the first reactant flows into the second reaction chamber through the liquid inlet pipeline under the action of the pressure difference of the first reaction chamber and the second reaction chamber to react with the second reactant to generate carbon dioxide, the generation of the carbon dioxide can be controlled according to the requirement, and the generation amount of the carbon dioxide can be controlled.
Furthermore, a first check valve is arranged on the liquid inlet pipeline, and the first reactant of the first reaction chamber flows to the second reaction chamber through the liquid inlet pipeline and the first check valve, so that the carbon dioxide generated by the second reaction chamber can be prevented from being sucked back to the first reaction chamber to influence the reaction efficiency.
Still further, the carbon dioxide generation device is arranged in the refrigerating chamber of the refrigerator, so that the carbon dioxide can be supplied to the refrigerating chamber for a long time, the fresh-keeping effect of the refrigerator is effectively guaranteed, the user does not need to frequently add the carbon dioxide, and the user experience is improved.
The foregoing description is only an overview of the technical solutions of the present invention, and the embodiments of the present invention are described below in order to make the technical means of the present invention more clearly understood and to make the above and other objects, features, and advantages of the present invention more clearly understandable.
The above and other objects, advantages and features of the present invention will become more apparent to those skilled in the art from the following detailed description of specific embodiments thereof, taken in conjunction with the accompanying drawings.
Drawings
Some specific embodiments of the utility model will be described in detail hereinafter, by way of illustration and not limitation, with reference to the accompanying drawings. The same reference numbers in the drawings identify the same or similar elements or components. Those skilled in the art will appreciate that the drawings are not necessarily drawn to scale. In the drawings:
FIG. 1 is a schematic block diagram of a carbon dioxide generating apparatus according to one embodiment of the present invention;
fig. 2 is a schematic structural view of a refrigerator according to one embodiment of the present invention.
Detailed Description
Exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. While exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure may be embodied in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art.
It should be noted that the technical features of the embodiments and alternative embodiments of the present invention may be combined with each other without conflict.
Fig. 1 is a schematic configuration diagram of a carbon dioxide generation apparatus according to an embodiment of the present invention. Referring to fig. 1, the apparatus comprises at least a reaction vessel 110 and a liquid inlet pipe 113, wherein the reaction vessel 110 defines a first reaction chamber 111 and a second reaction chamber 112 which are closed and respectively contain a first reactant 1111 and a second reactant 1121, and the first reaction chamber 111 and the second reaction chamber 112 can be adjacent to each other, wherein at least the first reactant 1111 is in liquid form. One end of the liquid inlet pipe 113 extends into the bottom of the first reaction chamber 111, and the other end of the liquid inlet pipe 113 extends into the second reaction chamber 112. The first reactant 1111 flows into the second reaction chamber 112 through the liquid inlet pipe 113 under the pressure difference between the first reaction chamber 111 and the second reaction chamber 112 to react with the second reactant 1121 to generate carbon dioxide.
Wherein the first reactant 1111 may be citric acid and the second reactant 1121 may be sodium bicarbonate, the reaction is as follows:
C6H8O7+3NaHCO3＝3CO2↑+3H2O+Na3C6H5O7
in addition, the first reactant 1111 and the second reactant 1121 may be chemical substances such as sodium carbonate, potassium bicarbonate, oxalic acid, acetic acid, carbonate, bicarbonate, weak acid, etc. which can safely and stably generate carbon dioxide, and the second reactant 1121 may exist in the form of liquid or solid powder in addition to the first reactant 1111, which is not particularly limited in the present invention.
In the embodiment of the present invention, the reaction container 110 defines the first reaction chamber 111 and the second reaction chamber 112 which are sealed and respectively contain the first reactant 1111 and the second reactant 1121, and at least the first reactant 1111 exists in a liquid form, one end of the liquid inlet pipe 113 extends into the bottom of the first reaction chamber 111, and the other end extends into the second reaction chamber 112, so that the first reactant 1111 flows to the second reaction chamber 112 through the liquid inlet pipe 113 under the pressure difference effect of the first reaction chamber 111 and the second reaction chamber 112 to react with the second reactant 1121 to generate carbon dioxide, so that the generation of the carbon dioxide can be controlled as required, and the generation amount of the carbon dioxide can be controlled.
Further, in order to prevent the carbon dioxide generated in the second reaction chamber 112 from being sucked back into the first reaction chamber 111 and affecting the reaction efficiency, in some embodiments of the present invention, referring to fig. 1, a first check valve 114 is disposed on the liquid inlet pipe 113, and the first reactant 1111 of the first reaction chamber 111 flows to the second reaction chamber 112 through the liquid inlet pipe 113 and the first check valve 114 and reacts with the second reactant 1121 to generate carbon dioxide.
Referring to fig. 1, in some embodiments of the present invention, an air inlet pipeline 115 is disposed on a side wall of the first reaction chamber 111, and the apparatus further includes an air pump 116, the air pump 116 is disposed outside the reaction container 110, an air outlet end of the air pump 116 is opposite to an air inlet end of the air inlet pipeline 115, and the air pump 116 is configured to deliver air to the first reaction chamber 111 through the air inlet pipeline 115 to pressurize the first reaction chamber 111, so as to generate a pressure difference between the first reaction chamber 111 and the second reaction chamber 112, so that the first reactant 1111 in the first reaction chamber 111 flows to the second reaction chamber 112 through the liquid inlet pipeline 113 to react with the second reactant 1121.
In some embodiments of the present invention, a second check valve 117 is disposed on the air inlet line 115, and the air generated by the air pump 116 flows to the first reaction chamber 111 through the air inlet line 115 and the second check valve 117, and the second check valve 117 is also used for preventing back suction.
In some embodiments of the present invention, the gas outlet line 118 is disposed on the sidewall of the second reaction chamber 112, the gas outlet line 118 is disposed with a third check valve 119, carbon dioxide generated in the second reaction chamber 112 flows out of the reaction vessel 110 through the gas outlet line 118 and the third check valve 119, and the third check valve 119 is also used for preventing back suction.
In some embodiments of the present invention, the carbon dioxide generating apparatus 100 further comprises an external air pipeline 120 and an air flow distribution device, wherein the external air pipeline 120 comprises an air inlet 121 and at least one air outlet 122 communicated with the air inlet 121, and the air inlet 121 of the external air pipeline 120 is communicated with the air outlet pipeline 118; an air flow distribution device is disposed on the external air pipeline 120, and the air flow distribution device is configured to selectively communicate the air inlet 121 of the external air pipeline 120 to any one of the air outlets 122.
Optionally, the airflow distribution device includes a solenoid valve 130 corresponding to the air outlet 122 of the at least one external air pipeline 120, and the at least one solenoid valve 130 is disposed near the at least one air outlet 122, and the at least one solenoid valve 130 is used to control the air inlet 121 of the external air pipeline 120 to be connected to or disconnected from any air outlet 122.
In order to output carbon dioxide at a constant pressure and stably, in some embodiments of the present invention, the air inlet 121 of the external air pipeline 120 is communicated with the air outlet pipeline 118 through a pressure reducing valve 140, a pressure sensor is disposed inside the pressure reducing valve 140 for detecting the pressure of carbon dioxide in the pressure reducing valve, and the pressure reducing valve 140 adjusts to reduce the inlet pressure to a desired outlet pressure and keep the outlet pressure stable, so that carbon dioxide is output at a constant pressure.
In case of the second reaction chamber 112 possibly having an overpressureIn some embodiments of the present invention, the carbon dioxide generator 100 further includes a pressure relief pipeline 150, the pressure relief pipeline 150 has a first end 152 and a second end 153, the first end 152 of the pressure relief pipeline 150 is communicated with the second reaction chamber 112, the second end 153 of the pressure relief pipeline 150 is open to the outside of the reaction vessel 110, a pressure relief valve 151 is disposed on the pressure relief pipeline 150, the pressure relief valve 151 may be connected to the pressure relief pipeline 150 in a connection manner such as a standard interface, a quick interface, a threaded connection, a special customized connection, etc., when the pressure of the second reaction chamber 112 exceeds a predetermined pressure value, for example, 35kg/cm2The pressure relief valve 151 is automatically opened and the pressure relief pipeline 150 is opened, so that the carbon dioxide in the second reaction chamber 112 flows to the outside of the reaction vessel 110 through the pressure relief pipeline 150, thereby reducing the pressure in the second reaction chamber 112.
The relief valve 151 may be a spring type, lever type, or pulse type relief valve.
Referring to fig. 1, in some embodiments of the present invention, the pressure reducing valve 140 may have an air inlet 143, a first air outlet 141, and a second air outlet 142, wherein the air inlet 143 of the pressure reducing valve 151 is communicated with the air outlet 118, the first air outlet 141 of the pressure reducing valve 140 is communicated with the air inlet 121 of the external air pipeline 120, the second air outlet 142 of the pressure reducing valve 140 is communicated with the first end 152 of the pressure relief pipeline 150, and when the pressure in the pressure reducing valve 140 exceeds a preset pressure value, the pressure reducing valve 151 is conducted and the pressure relief pipeline 150 is conducted.
In some embodiments of the present invention, a filtering device may be disposed on the gas outlet end of the gas outlet pipeline 118, and the filtering device may be made of PP, ceramic, metal, glass fiber, etc. which can effectively block impurity particles, and is used for filtering impurities in carbon dioxide.
Based on the same inventive concept, the utility model also provides a refrigerator 200, and fig. 2 is a schematic structural diagram of the refrigerator according to one embodiment of the utility model. Referring to fig. 2, the refrigerator 200 includes a housing 210 and the carbon dioxide generating device 100 of any of the above embodiments, wherein the housing 210 defines a refrigerating compartment 220, and the carbon dioxide generating device 100 is disposed in the refrigerating compartment 220.
In the embodiment of the present invention, the carbon dioxide generating device 100 is disposed in the refrigerating chamber 220 of the refrigerator 200, so that it is ensured that carbon dioxide is provided for the refrigerating chamber 220 for a long time, the fresh-keeping effect of the refrigerator is effectively ensured, and the user experience is improved without frequently adding carbon dioxide.
In some embodiments of the present invention, the refrigerating compartment 220 is divided into a plurality of closed refrigerating spaces 221, and at least one air outlet 122 of the external air pipeline 120 of the carbon dioxide generating apparatus 100 leads to different refrigerating spaces 221; and a second end 153 of the pressure relief line 150 of the carbon dioxide generating device 100 opens to the outside of the refrigerator 200.
The different refrigeration spaces can be set with different carbon dioxide concentrations to store foods with different carbon dioxide concentrations, for example, the carbon dioxide concentration required by vegetables and fruits is between 5% and 10%, the carbon dioxide concentration required by red meat is between 20% and 30%, and the carbon dioxide concentration required by other meat is between 35% and 40%. The at least one air outlet 122 leads to different refrigerating spaces 221, so that carbon dioxide with corresponding concentration can be provided for the different refrigerating spaces 221 according to the carbon dioxide concentration required by the different refrigerating spaces 221, and the user experience is improved.
In addition, the second end 153 of the pressure release pipeline 150 of the carbon dioxide generating device 100 is open to the outside of the refrigerator 200, so that the carbon dioxide flowing out through the pressure release pipeline 150 can be prevented from affecting the concentration of the carbon dioxide in the refrigerating compartment 220.
In addition, the different refrigerating spaces 221 are each provided with a carbon dioxide detecting device 230 for detecting the concentration of carbon dioxide in the different refrigerating spaces 221.
In addition, the refrigerator 200 may further include an alarm device configured to alarm when the pressure of the pressure reducing valve 140 is lower than a set pressure value, for example, 1.1Kg/cm2And alarm information of the exhaustion of the reactant is output to prompt the timely supplement of the reactant, so that the preservation effect of the refrigerator 200 is ensured.
In addition, the refrigerator 200 further includes a controller configured to control the opening and closing of the air pump 116, and the conduction and the shutoff of the solenoid valve 130.
The following is a detailed description of the fresh-keeping control process of the refrigerator 200.
The controller is electrically connected to the carbon dioxide detecting device 230, the air pump 116 and the air flow distribution device, when the refrigerator 200 is in a carbon dioxide fresh-keeping mode, when the controller detects that the concentration of carbon dioxide is lower than a corresponding preset concentration value through the carbon dioxide detecting device 230 of any refrigerating space 221, the pressure value of the pressure reducing valve 140 is obtained first, if the pressure value of the pressure reducing valve 140 is greater than a specified pressure value, for example, 3KG, it indicates that sufficient carbon dioxide exists in the carbon dioxide generating device 100 at this time, and in this case, the air flow distribution device is directly controlled to conduct the air inlet 121 of the external air pipeline 120 to the air outlet 122 leading to the refrigerating space 221 so as to provide carbon dioxide to the refrigerating space 221; if the pressure value of the pressure reducing valve 140 is less than the predetermined pressure value, it means that the carbon dioxide of the carbon dioxide generating device 100 is insufficient, and it is necessary to control the carbon dioxide generating device 100 to generate carbon dioxide, specifically, the controller first controls the air pump 116 to be turned on for a preset time period, for example, 10s, so that the carbon dioxide generating device 100 generates carbon dioxide, and after the reaction is performed for a certain time period, for example, 10s, the controller controls the air flow distribution device to conduct the air inlet 121 of the external air pipeline 120 to the air outlet 122 leading to the refrigerating space 221 so as to provide carbon dioxide to the refrigerating space 221. Thereafter, when the controller detects that the carbon dioxide concentration of the refrigerating space 221 exceeds the corresponding preset concentration value through the carbon dioxide detecting device 230 of the refrigerating space 221, the controller may control the air flow distributing device to close the air outlet 122 of the external air pipeline 120 leading to the refrigerating space 221.
The controller is further electrically connected with the alarm device and the pressure reducing valve 140, and when the controller detects that the pressure of the pressure reducing valve 140 is lower than a set pressure value through a pressure sensor in the pressure reducing valve 140, the controller controls the alarm device to output alarm information that the reactant is about to be exhausted so as to prompt that the reactant is supplemented in time, so that the fresh-keeping effect of the refrigerator 200 is ensured.
In the carbon dioxide generating device 100, the reaction container 110 defines a first reaction chamber 111 and a second reaction chamber 112 for respectively containing a first reactant 1111 and a second reactant 1121, wherein at least the first reactant 1111 exists in a liquid form, one end of the liquid inlet pipe 113 extends into the bottom of the first reaction chamber 111, and the other end extends into the second reaction chamber 112, so that the first reactant 1111 flows into the second reaction chamber 112 through the liquid inlet pipe 113 under the pressure difference of the first reaction chamber 111 and the second reaction chamber 112 to react with the second reactant 1121 to generate carbon dioxide, thereby controlling the generation of the carbon dioxide according to needs and realizing the controllable generation amount of the carbon dioxide.
Further, the first check valve 114 is disposed on the liquid inlet pipe 113, and the first reactant 1111 in the first reaction chamber 111 flows to the second reaction chamber 112 through the liquid inlet pipe 113 and the first check valve 114, so as to prevent the carbon dioxide gas generated in the second reaction chamber 112 from being sucked back into the first reaction chamber 111 to affect the reaction efficiency.
Still further, the air inlet 121 of the external air pipeline 120 is communicated with the air outlet pipeline 118 through a pressure reducing valve 140, a pressure sensor is arranged inside the pressure reducing valve 140 and used for detecting the pressure of the carbon dioxide in the pressure reducing valve 140, and the pressure reducing valve 140 reduces the inlet pressure to the required outlet pressure through adjustment and keeps the outlet pressure stable, so that the carbon dioxide is output at a constant pressure.
Furthermore, the carbon dioxide generation device is arranged in the refrigerating chamber 220 of the refrigerator 200, so that the carbon dioxide can be supplied to the refrigerating chamber 220 for a long time, the fresh-keeping effect of the refrigerator 200 is effectively ensured, the frequent addition of the carbon dioxide by a user is not needed, and the user experience is improved.
Thus, it should be appreciated by those skilled in the art that while a number of exemplary embodiments of the utility model have been illustrated and described in detail herein, many other variations or modifications consistent with the principles of the utility model may be directly determined or derived from the disclosure of the present invention without departing from the spirit and scope of the utility model. Accordingly, the scope of the utility model should be understood and interpreted to cover all such other variations or modifications.
Claims (10)
1. A carbon dioxide generation device, comprising:
a reaction vessel defining a first and a second closed reaction chamber containing a first and a second reactant, respectively, wherein at least the first reactant is present in liquid form;
one end of the liquid inlet pipeline extends into the bottom of the first reaction chamber, the other end of the liquid inlet pipeline extends into the second reaction chamber,
the first reactant flows to the second reaction chamber through the liquid inlet pipeline under the action of the pressure difference between the first reaction chamber and the second reaction chamber to react with the second reactant to generate carbon dioxide.
2. The apparatus of claim 1,
the liquid inlet pipeline is provided with a first check valve, and a first reactant of the first reaction chamber flows to the second reaction chamber through the liquid inlet pipeline and the first check valve.
3. The apparatus of claim 1,
an air inlet pipeline is arranged on the side wall of the first reaction chamber; and
the device also comprises an air pump which is arranged outside the reaction container, is opposite to the air inlet pipeline and is configured to convey air to the first reaction chamber through the air inlet pipeline so as to pressurize the first reaction chamber to generate pressure difference between the first reaction chamber and the second reaction chamber.
4. The apparatus of claim 3,
and the air inlet pipeline is provided with a second check valve, and air generated by the air pump flows to the first reaction chamber through the air inlet pipeline and the second check valve.
5. The apparatus of claim 1,
and an air outlet pipeline is arranged on the side wall of the second reaction chamber, and a third check valve is arranged on the air outlet pipeline.
6. The apparatus of claim 5, further comprising:
the external gas pipeline comprises a gas inlet and at least one gas outlet communicated with the gas inlet, and the gas inlet is communicated with the gas outlet pipeline;
and the airflow distribution device is arranged on the external air pipeline and is configured to selectively enable the air inlet to be communicated with any one of the air outlets.
7. The apparatus of claim 6, wherein the inlet of the external air line is in communication with the outlet line through a pressure relief valve.
8. The apparatus of claim 1, further comprising:
and the pressure relief pipeline is provided with a first end and a second end, the first end is communicated with the second reaction chamber, the second end is communicated with the outside of the reaction container, and the pressure relief pipeline is configured to be communicated when the pressure of the second reaction chamber exceeds a preset pressure value so as to reduce the pressure of the second reaction chamber.
9. A refrigerator, characterized by comprising:
a housing defining a refrigeration compartment;
a carbon dioxide generating apparatus as claimed in any of claims 1 to 8, provided in the refrigerated compartment.
10. The refrigerator according to claim 9,
the refrigerating chamber is divided into a plurality of closed refrigerating spaces, and at least one air outlet of an external air pipeline of the carbon dioxide generating device is respectively communicated with different refrigerating spaces; and
and a second end of a pressure relief pipeline of the carbon dioxide generation device is communicated with the outside of the refrigerator.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121575045.3U CN215626820U (en) | 2021-07-12 | 2021-07-12 | Carbon dioxide generates device and refrigerator |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121575045.3U CN215626820U (en) | 2021-07-12 | 2021-07-12 | Carbon dioxide generates device and refrigerator |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN215626820U true CN215626820U (en) | 2022-01-25 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202121575045.3U Active CN215626820U (en) | 2021-07-12 | 2021-07-12 | Carbon dioxide generates device and refrigerator |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN215626820U (en) |
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2021
- 2021-07-12 CN CN202121575045.3U patent/CN215626820U/en active Active
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