CN220591106U - Ectopic soil thermal desorption repair system with dehydration function - Google Patents
Ectopic soil thermal desorption repair system with dehydration function Download PDFInfo
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- CN220591106U CN220591106U CN202321871301.2U CN202321871301U CN220591106U CN 220591106 U CN220591106 U CN 220591106U CN 202321871301 U CN202321871301 U CN 202321871301U CN 220591106 U CN220591106 U CN 220591106U
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- 239000002689 soil Substances 0.000 title claims abstract description 103
- 238000003795 desorption Methods 0.000 title claims abstract description 29
- 230000018044 dehydration Effects 0.000 title claims abstract description 20
- 238000006297 dehydration reaction Methods 0.000 title claims abstract description 20
- 238000010438 heat treatment Methods 0.000 claims abstract description 47
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 95
- 238000001816 cooling Methods 0.000 claims description 16
- 238000005485 electric heating Methods 0.000 claims description 11
- 238000004321 preservation Methods 0.000 claims description 10
- 238000007789 sealing Methods 0.000 claims description 4
- 239000003344 environmental pollutant Substances 0.000 description 31
- 231100000719 pollutant Toxicity 0.000 description 31
- 239000012535 impurity Substances 0.000 description 14
- 239000007788 liquid Substances 0.000 description 13
- 238000001179 sorption measurement Methods 0.000 description 10
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 7
- 230000005540 biological transmission Effects 0.000 description 7
- 239000000498 cooling water Substances 0.000 description 7
- 238000001914 filtration Methods 0.000 description 6
- 238000010586 diagram Methods 0.000 description 4
- 239000002245 particle Substances 0.000 description 4
- 239000000356 contaminant Substances 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000009434 installation Methods 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 238000005067 remediation Methods 0.000 description 2
- 239000010865 sewage Substances 0.000 description 2
- 238000010521 absorption reaction Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 238000009833 condensation Methods 0.000 description 1
- 230000005494 condensation Effects 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 239000008187 granular material Substances 0.000 description 1
- 229910001385 heavy metal Inorganic materials 0.000 description 1
- 239000013618 particulate matter Substances 0.000 description 1
- 239000002957 persistent organic pollutant Substances 0.000 description 1
- 238000000746 purification Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
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Abstract
The utility model discloses an ectopic soil thermal desorption restoration system with a dehydration function, which belongs to the technical field of polluted soil restoration and comprises a soil heating device and a gas treatment device, wherein the gas treatment device is arranged on one side of the soil heating device.
Description
Technical Field
The utility model relates to the technical field of polluted soil remediation, in particular to an ectopic soil thermal desorption remediation system with a dehydration function.
Background
An ectopic soil thermal desorption restoration system with a dehydration function is a technology for restoring polluted soil. The thermal desorption technology is adopted, the pollutants are volatilized from the soil by heating the polluted soil, and then the volatilized pollutants are collected and treated by a dehydration function. The repairing system can efficiently remove organic pollutants, heavy metals and other harmful substances in the soil, so that the soil quality is improved, and the environmental pollution risk is reduced.
At present, the structural design of thermal desorption restoration equipment used for restoring polluted soil is too single. In the use process, the existing thermal desorption repair equipment cannot remove the water in the polluted soil in the form of water vapor, and the water vapor removed in the polluted soil is inconvenient to adsorb, filter and liquid-cooled for storage, so that certain limitations exist in the use process. Therefore, we propose an ectopic soil thermal desorption restoration system with dehydration function to solve the above mentioned problems.
Disclosure of Invention
This section is intended to outline some aspects of embodiments of the utility model and to briefly introduce some preferred embodiments. Some simplifications or omissions may be made in this section as well as in the description of the utility model and in the title of the utility model, which may not be used to limit the scope of the utility model.
Therefore, the utility model aims to provide an ectopic soil thermal desorption restoration system with a dehydration function, which can solve the problems that the existing thermal desorption restoration equipment cannot remove water in polluted soil in the form of water vapor, and the water vapor removed in the polluted soil is inconvenient to carry out adsorption filtration and liquid cooling storage treatment, so that certain limitation exists in use.
In order to solve the technical problems, the utility model provides an ectopic soil thermal desorption restoration system with a dehydration function, which adopts the following technical scheme: the device comprises soil heating equipment and a gas treatment device, wherein the gas treatment device is arranged on one side of the soil heating equipment, the gas treatment device comprises a storage assembly, and a gas conveying assembly is arranged at the top of the storage assembly;
the soil heating equipment comprises a soil heating box, and one side of the soil heating box is connected with a sealing box door.
Through adopting above-mentioned technical scheme, this scheme is through the soil tray of installing additional in Wen Kongqiang inside, can put the contaminated soil layering that needs thermal desorption restoration in the inside of soil heating cabinet, through the electric heating pipe of installing additional between two sets of electric heaters, can also carry out high temperature heating to the contaminated soil of soil heating cabinet inside layering and put, when contaminated soil receives high temperature heating, can evaporate out the pollutant in the contaminated soil inside in the form of steam, cooperate first gas pipeline and exhaust pipe mouth, can also carry the pollutant steam that the contaminated soil inside deviate from to the gas transfer jar;
according to the scheme, the second filter screen plate is additionally arranged at the bottom of the inner cavity of the gas transfer tank and is a coarse mesh filter screen, so that large particles in water vapor can be filtered, the third filter screen plate is additionally arranged at the top of the inner cavity of the gas storage cavity and is a fine mesh filter screen, fine impurities in the water vapor can be purified and adsorbed, the particulate impurities in the pollutant water vapor can be effectively reduced, and the filtered and purified pollutant water vapor can be discharged into the spiral heat exchange tube additionally arranged in the gas liquefier by being matched with the second gas transmission pipeline additionally arranged between the gas transfer tank and the gas liquefier;
according to the scheme, the water inlet pipe and the water outlet pipe are additionally arranged on one side of the gas liquefier, the cooling water can be circularly controlled, the gas liquefier can utilize the cooling water to conduct heat exchange cooling treatment on pollutant water vapor discharged into the spiral heat exchange pipe, the pollutant water vapor can be condensed into pollutant liquid water, the pollutant liquid water can be discharged into the inside of the liquefied water storage tank from the spiral heat exchange pipe through the water outlet pipe orifice additionally arranged on the top of the liquefied water storage tank, the first filter screen plate is matched with the inside of the inner cavity of the water storage cavity, the first filter screen plate is an activated carbon adsorption screen plate, impurity and peculiar smell adsorption treatment can be conducted on the pollutant liquid water discharged into the inside of the liquefied water storage tank, and treated sewage can be finally discharged outwards from the water outlet valve.
Optionally, a plurality of electric heaters are respectively arranged on two sides of the soil heating box, a plurality of electric heating pipes are connected between the two electric heaters, an exhaust pipe orifice is arranged at the top of the soil heating box, a heat preservation cavity is further formed in the soil heating box, and the electric heating pipes are located in the heat preservation cavity.
Through adopting above-mentioned technical scheme, this scheme is through a plurality of groups of electric heaters that install respectively in soil heating cabinet both sides to and a plurality of groups of electric heating pipe that install additional between two groups of electric heaters, can carry out high temperature heating to soil that the soil heating cabinet is inside to the pollution soil that the layering was put.
Optionally, the inner wall both sides of heat preservation cavity are provided with a plurality of groups respectively and adjust the grillage, two groups adjust between the grillage sliding connection have soil storage dish.
Through adopting above-mentioned technical scheme, this scheme is through a plurality of groups of regulation grillages of installing additional respectively in Wen Kongqiang inner wall both sides to and adjust the soil tray of sliding connection between the grillage in two groups, conveniently put the contaminated soil layering that needs thermal desorption restoration in the inside of soil heating cabinet, can also carry out pull slip regulation to the soil tray according to the in service behavior of contaminated soil access.
Optionally, the gas conveying assembly includes the gas transfer jar, one side bottom of gas transfer jar is connected with first gas transmission pipeline, the top of gas transfer jar is connected with the second gas transmission pipeline, the one end that the gas transfer jar was kept away from to the second gas transmission pipeline still installs the gas liquefier.
Through adopting above-mentioned technical scheme, this scheme is through changeing jar and gas liquefier structure in gas, can carry out impurity filtration treatment to follow soil heating case exhaust pollutant steam, can also carry out heat transfer cooling treatment to the pollutant steam after filtering the purification.
Optionally, the storage assembly comprises a liquefied water storage tank, and a support base is mounted at the bottom of the liquefied water storage tank.
Through adopting above-mentioned technical scheme, this scheme is through the liquefied water storage jar that installs additional at supporting base top for the temporary storage of liquefied water storage jar.
Optionally, a drain pipe orifice is installed on one side of the top of the liquefied water storage tank, a drain valve is connected to one end bottom of the liquefied water storage tank, a water storage cavity is formed in the liquefied water storage tank, and a first filter screen plate is further arranged in the middle of the inner cavity of the water storage cavity.
Through adopting above-mentioned technical scheme, this scheme is through the first filter screen plate at water storage cavity inner chamber middle part additional installation, and this first filter screen plate is activated carbon adsorption screen plate, can carry out impurity, peculiar smell adsorption treatment to the pollutant liquid water who discharges into liquefied water storage tank inside.
Optionally, the gas storage cavity has been seted up to the inside of gas transfer jar, the second filter screen plate is installed to the inner chamber bottom of gas storage cavity, the inner chamber top of gas storage cavity still is provided with the third filter screen plate.
Through adopting above-mentioned technical scheme, this scheme is through inside second filter screen plate and the third filter screen plate of installing additional of gas transfer jar, can play filterable effect to the large granule thing in the steam, can also purify the absorption to the fine impurity in the steam and handle, particulate matter impurity in the pollutant steam of can effectually reduce.
Optionally, one side top of gas liquefier is connected with the inlet tube, one side bottom that the gas liquefier is close to the inlet tube is provided with the outlet pipe, cooling cavity has been seted up to gas liquefier's inside, cooling cavity's inside still is provided with spiral heat exchange tube.
Through adopting above-mentioned technical scheme, this scheme can carry out circulation control through inlet tube and outlet pipe at gas liquefier one side additional installation for gas liquefier can utilize the cooling water to carry out heat transfer cooling treatment to the pollutant steam of discharging into in the spiral heat exchange tube, can be with pollutant steam condensation for pollutant liquid water.
In summary, the present utility model includes at least one of the following beneficial effects:
1. according to the scheme, the contaminated soil needing thermal desorption restoration can be layered in the soil heating box through the soil storage tray additionally arranged in the Wen Kongqiang, the contaminated soil layered in the soil heating box can be subjected to high-temperature heating treatment through the electric heating pipes additionally arranged between the two groups of electric heaters, when the contaminated soil is heated at high temperature, the contaminants in the contaminated soil can be evaporated in the form of water vapor, and the water vapor of the contaminants removed from the contaminated soil can be conveyed into the gas transfer tank by matching with the first gas conveying pipeline and the gas exhaust pipe orifice;
2. according to the scheme, the second filter screen plate is additionally arranged at the bottom of the inner cavity of the gas transfer tank and is a coarse mesh filter screen, so that large particles in water vapor can be filtered, the third filter screen plate is additionally arranged at the top of the inner cavity of the gas storage cavity and is a fine mesh filter screen, fine impurities in the water vapor can be purified and adsorbed, the particulate impurities in the pollutant water vapor can be effectively reduced, and the filtered and purified pollutant water vapor can be discharged into the spiral heat exchange tube additionally arranged in the gas liquefier by being matched with the second gas transmission pipeline additionally arranged between the gas transfer tank and the gas liquefier;
3. according to the scheme, the water inlet pipe and the water outlet pipe are additionally arranged on one side of the gas liquefier, the cooling water can be circularly controlled, the gas liquefier can utilize the cooling water to conduct heat exchange cooling treatment on pollutant water vapor discharged into the spiral heat exchange pipe, the pollutant water vapor can be condensed into pollutant liquid water, the pollutant liquid water can be discharged into the inside of the liquefied water storage tank from the spiral heat exchange pipe through the water outlet pipe orifice additionally arranged on the top of the liquefied water storage tank, the first filter screen plate is matched with the inside of the inner cavity of the water storage cavity, the first filter screen plate is an activated carbon adsorption screen plate, impurity and peculiar smell adsorption treatment can be conducted on the pollutant liquid water discharged into the inside of the liquefied water storage tank, and treated sewage can be finally discharged outwards from the water outlet valve.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present utility model, the drawings that are needed for the description of the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present utility model, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic diagram of the overall structure of the present utility model;
FIG. 2 is a schematic view of the soil heating apparatus of the present utility model;
FIG. 3 is a schematic view of a gas delivery assembly according to the present utility model;
FIG. 4 is a schematic diagram of a storage assembly according to the present utility model;
FIG. 5 is a schematic diagram of a gas transfer tank according to the present utility model;
fig. 6 is a schematic diagram of a gas liquefier according to the present utility model.
Reference numerals illustrate: 100. a soil heating device; 101. a soil heating box; 101a, an electric heater; 101a-1, an electric heating tube; 101b, an exhaust nozzle; 101c, a heat-insulating cavity; 101c-1, adjusting the plate frame; 101c-2, a soil storage tray; 102. sealing the box door; 200. a gas treatment device; 201. a storage assembly; 201a, a liquefied water storage tank; 201a-1, a drain pipe orifice; 201a-2, drain valve; 201a-3, a water storage cavity; 201a-4, a first screen panel; 201b, a support base; 202. a gas delivery assembly; 202a, a gas transfer tank; 202a-1, a gas storage cavity; 202a-2, a second screen panel; 202a-3, a third screen panel; 202b, a first gas transmission pipeline; 202c, a second gas transmission pipeline; 202d, a gas liquefier; 202d-1, a water inlet pipe; 202d-2, a water outlet pipe; 202d-3, cooling the cavity; 202d-4, spiral heat exchange tubes.
Detailed Description
The utility model is described in further detail below with reference to fig. 1-6.
Referring to fig. 1-2, the utility model discloses an ectopic soil thermal desorption restoration system with dehydration function,
the device comprises soil heating equipment 100 and a gas treatment device 200, wherein the gas treatment device 200 is arranged on one side of the soil heating equipment 100, the gas treatment device 200 comprises a storage assembly 201, and a gas conveying assembly 202 is arranged on the top of the storage assembly 201;
the soil heating apparatus 100 includes a soil heating box 101, and a sealing box door 102 is connected to one side of the soil heating box 101.
The two sides of the soil heating box 101 are respectively provided with a plurality of groups of electric heaters 101a, a plurality of groups of electric heating pipes 101a-1 are connected between the two groups of electric heaters 101a, an exhaust pipe orifice 101b is arranged at the top of the soil heating box 101, a heat preservation cavity 101c is further formed in the soil heating box 101, the electric heating pipes 101a-1 are positioned in the heat preservation cavity 101c, and high-temperature heating treatment can be carried out on polluted soil which is placed in the soil heating box 101 in a layered mode through the plurality of groups of electric heaters 101a respectively arranged on the two sides of the soil heating box 101 and the plurality of groups of electric heating pipes 101a-1 arranged between the two groups of electric heaters 101 a.
In the second embodiment, referring to fig. 2 to 4, in order to solve the problem that the existing thermal desorption repair device cannot remove the moisture in the polluted soil in the form of water vapor, and also inconvenient adsorption filtration and liquid cooling storage treatment are performed on the water vapor removed in the polluted soil, there is a certain limitation in use, and based on the same concept as that of the first embodiment, the thermal desorption repair system for ectopic soil with dehydration function further includes:
a plurality of groups of adjusting plate frames 101c-1 are respectively arranged on two sides of the inner wall of the heat preservation cavity 101c, a soil storage disc 101c-2 is slidably connected between the two groups of adjusting plate frames 101c-1, and the contaminated soil needing thermal desorption repair is conveniently layered in the soil heating box 101 through the plurality of groups of adjusting plate frames 101c-1 which are respectively additionally arranged on two sides of the inner wall of the heat preservation cavity Wen Kongqiang c and the soil storage disc 101c-2 which is slidably connected between the two groups of adjusting plate frames 101c-1, and the soil storage disc 101c-2 can be slidably adjusted in a drawing manner according to the use condition of the contaminated soil.
The gas conveying assembly 202 comprises a gas transfer tank 202a, a first gas pipeline 202b is connected to the bottom of one side of the gas transfer tank 202a, a second gas pipeline 202c is connected to the top of the gas transfer tank 202a, a gas liquefier 202d is further installed at one end, far away from the gas transfer tank 202a, of the second gas pipeline 202c, pollutant vapor discharged from the soil heating box 101 can be subjected to impurity filtering treatment through the structures of the gas transfer tank 202a and the gas liquefier 202d, and the filtered and purified pollutant vapor can be subjected to heat exchange cooling treatment.
The storage assembly 201 includes a liquefied water storage tank 201a, a support base 201b is installed at the bottom of the liquefied water storage tank 201a, and the liquefied water storage tank 201a is temporarily stored by adding the liquefied water storage tank 201a to the top of the support base 201 b.
Referring to fig. 4-6, in order to solve the problem that the existing thermal desorption repair device cannot remove the moisture in the polluted soil in the form of water vapor, and also inconvenient adsorption filtration and liquid cooling storage treatment are performed on the water vapor removed in the polluted soil, there is a certain limitation in use, and based on the same concept as that of the first embodiment, the thermal desorption repair system for ectopic soil with dehydration function further comprises:
a drain pipe orifice 201a-1 is arranged on one side of the top of the liquefied water storage tank 201a, a drain valve 201a-2 is connected to the bottom of one end of the liquefied water storage tank 201a, a water storage cavity 201a-3 is formed in the liquefied water storage tank 201a, a first filter screen 201a-4 is further arranged in the middle of the inner cavity of the storage Shui Kongqiang a-3, and impurities and peculiar smell can be adsorbed on pollutant liquid water discharged into the liquefied water storage tank 201a through the first filter screen 201a-4 additionally arranged in the middle of the inner cavity of the water storage cavity 201a-3, and the first filter screen 201a-4 is an active carbon adsorption screen.
The gas transfer tank 202a is internally provided with a gas storage cavity 202a-1, the bottom of the inner cavity of the gas storage cavity 202a-1 is provided with a second filter screen plate 202a-2, the top of the inner cavity of the gas storage cavity 202a-1 is also provided with a third filter screen plate 202a-3, and the second filter screen plate 202a-2 and the third filter screen plate 202a-3 additionally arranged in the gas transfer tank 202a can filter large particles in water vapor, purify and adsorb fine impurities in the water vapor, and effectively reduce the particle impurities in the water vapor.
The top of one side of the gas liquefier 202d is connected with a water inlet pipe 202d-1, a water outlet pipe 202d-2 is arranged at the bottom of one side of the gas liquefier 202d, which is close to the water inlet pipe 202d-1, a cooling cavity 202d-3 is formed in the gas liquefier 202d, a spiral heat exchange pipe 202d-4 is further arranged in the cooling cavity 202d-3, cooling water can be controlled in a circulating mode through the water inlet pipe 202d-1 and the water outlet pipe 202d-2 additionally arranged on one side of the gas liquefier 202d, so that the gas liquefier 202d can conduct heat exchange cooling treatment on pollutant water vapor discharged into the spiral heat exchange pipe 202d-4 by utilizing the cooling water, and can condense the pollutant water vapor into pollutant liquid water.
The above embodiments are not intended to limit the scope of the present utility model, so: all equivalent changes in structure, shape and principle of the utility model should be covered in the scope of protection of the utility model.
Claims (8)
1. An ectopic soil thermal desorption repair system with dehydration function, includes soil heating equipment (100) and gas treatment device (200), its characterized in that are installed to one side of soil heating equipment (100): the gas treatment device (200) comprises a storage component (201), wherein a gas conveying component (202) is arranged at the top of the storage component (201);
the soil heating device (100) comprises a soil heating box (101), and a sealing box door (102) is connected to one side of the soil heating box (101).
2. The ectopic soil thermal desorption restoration system with the dehydration function as set forth in claim 1, wherein: the two sides of the soil heating box (101) are respectively provided with a plurality of groups of electric heaters (101 a), a plurality of groups of electric heating pipes (101 a-1) are connected between the two groups of electric heaters (101 a), an exhaust pipe orifice (101 b) is arranged at the top of the soil heating box (101), a heat preservation cavity (101 c) is further formed in the soil heating box (101), and the electric heating pipes (101 a-1) are located in the heat preservation cavity (101 c).
3. An ectopic soil thermal desorption restoration system with a dehydration function as set forth in claim 2, wherein: a plurality of groups of adjusting grillages (101 c-1) are respectively arranged on two sides of the inner wall of the heat preservation cavity (101 c), and a soil storage disc (101 c-2) is connected between the two groups of adjusting grillages (101 c-1) in a sliding mode.
4. An ectopic soil thermal desorption restoration system with a dehydration function as set forth in claim 3, wherein: the gas conveying assembly (202) comprises a gas transfer tank (202 a), a first gas conveying pipeline (202 b) is connected to the bottom of one side of the gas transfer tank (202 a), a second gas conveying pipeline (202 c) is connected to the top of the gas transfer tank (202 a), and a gas liquefier (202 d) is further installed at one end, far away from the gas transfer tank (202 a), of the second gas conveying pipeline (202 c).
5. The ectopic soil thermal desorption restoration system with the dehydration function as set forth in claim 4, wherein: the storage assembly (201) comprises a liquefied water storage tank (201 a), and a support base (201 b) is installed at the bottom of the liquefied water storage tank (201 a).
6. The ectopic soil thermal desorption restoration system with the dehydration function as set forth in claim 5, wherein: a drain pipe orifice (201 a-1) is arranged on one side of the top of the liquefied water storage tank (201 a), a drain valve (201 a-2) is connected to the bottom of one end of the liquefied water storage tank (201 a), a water storage cavity (201 a-3) is formed in the liquefied water storage tank (201 a), and a first filter screen plate (201 a-4) is further arranged in the middle of the inner cavity of the water storage cavity (201 a-3).
7. The ectopic soil thermal desorption restoration system with the dehydration function as set forth in claim 6, wherein: the gas transfer tank is characterized in that a gas storage cavity (202 a-1) is formed in the gas transfer tank (202 a), a second filter screen plate (202 a-2) is arranged at the bottom of an inner cavity of the gas storage cavity (202 a-1), and a third filter screen plate (202 a-3) is further arranged at the top of the inner cavity of the gas storage cavity (202 a-1).
8. The ectopic soil thermal desorption restoration system with the dehydration function as set forth in claim 7, wherein: the top of one side of the gas liquefier (202 d) is connected with a water inlet pipe (202 d-1), a water outlet pipe (202 d-2) is arranged at the bottom of one side of the gas liquefier (202 d) close to the water inlet pipe (202 d-1), a cooling cavity (202 d-3) is formed in the gas liquefier (202 d), and a spiral heat exchange pipe (202 d-4) is further arranged in the cooling cavity (202 d-3).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321871301.2U CN220591106U (en) | 2023-07-17 | 2023-07-17 | Ectopic soil thermal desorption repair system with dehydration function |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321871301.2U CN220591106U (en) | 2023-07-17 | 2023-07-17 | Ectopic soil thermal desorption repair system with dehydration function |
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| Publication Number | Publication Date |
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| CN220591106U true CN220591106U (en) | 2024-03-15 |
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| CN202321871301.2U Active CN220591106U (en) | 2023-07-17 | 2023-07-17 | Ectopic soil thermal desorption repair system with dehydration function |
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| Country | Link |
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| CN (1) | CN220591106U (en) |
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2023
- 2023-07-17 CN CN202321871301.2U patent/CN220591106U/en active Active
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