CN215947033U - Esterification wastewater treatment system for polyester process - Google Patents
Esterification wastewater treatment system for polyester process Download PDFInfo
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- CN215947033U CN215947033U CN202122604934.4U CN202122604934U CN215947033U CN 215947033 U CN215947033 U CN 215947033U CN 202122604934 U CN202122604934 U CN 202122604934U CN 215947033 U CN215947033 U CN 215947033U
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Abstract
The utility model discloses an esterification wastewater treatment system for a polyester process, which comprises a first process tower, a wastewater tank, a stripping tower, a first treatment unit, a second treatment unit, a third treatment unit and a fourth treatment unit, wherein the fourth treatment unit comprises a third pipeline, a second process tower, a second ball valve, a first control valve and a third ball valve which are sequentially arranged on the third pipeline. According to the esterification wastewater treatment system, due to the arrangement of the fourth treatment unit, when the first process tower outputs esterification wastewater containing excessive glycol due to reduction of treatment capacity, the first pipeline and the third pipeline can be switched by closing the first ball valve and opening the second ball valve, the first control valve and the third ball valve, so that the esterification wastewater does not flow to the stripping tower any more and flows to the second process tower for treatment, and the service life of the stripping tower is prolonged.
Description
Technical Field
The utility model relates to the field of polyester process equipment, in particular to an esterification wastewater treatment system for a polyester process.
Background
In the polyester production process, a large amount of titanium dioxide solution is added in the esterification stage, the preparation solvent of titanium dioxide is ethylene glycol, excessive ethylene glycol and water vapor pass through a gas phase line to a process tower for treatment in the esterification reaction stage, and the ethylene glycol is recycled after the purity of the ethylene glycol meets the requirement. And in the operation process, the mixed gas of the ethylene glycol and the water can carry part of titanium dioxide, the titanium dioxide can be attached to a tray of the process tower, the treatment capacity of the process tower is reduced, the content of the ethylene glycol in the light component esterification wastewater output from the top of the process tower is increased, when the part of esterification wastewater enters the stripping tower for treatment, the overhigh ethylene glycol can increase the treatment load of the stripping tower, and the stripping tower can be stopped seriously or even caused, so that the proceeding of the polyester process is influenced.
SUMMERY OF THE UTILITY MODEL
The utility model aims to overcome the defects of the prior art and provides an esterification wastewater treatment system for a polyester process.
In order to achieve the purpose, the utility model adopts the technical scheme that:
the utility model provides an esterification wastewater treatment system that polyester technology was used, includes first technology tower, waste water jar, strip tower, locates first technology tower upper portion export with first processing unit between the waste water jar import, locate waste water jar export with second processing unit between the strip tower import, locate waste water jar export with third processing unit between the import of first technology tower upper portion, second processing unit include both ends respectively with waste water jar export with first pipeline that the strip tower import is linked together, locate first ball valve on the first pipeline, third processing unit include both ends respectively with waste water jar export with second pipeline that first technology tower upper portion import is linked together, locate first pump on the second pipeline, processing system still includes fourth processing unit, fourth processing unit include one end communicate in first pump with between the first technology tower second pump on the second pipeline The third pipeline, the second process tower that communicates in the third pipeline other end, along the second pipeline to the direction of second process tower locate in proper order on the third pipeline second ball valve, first control valve and third ball valve, wherein, the second ball valve with the third ball valve is close to respectively the first pump with the setting of second process tower.
Preferably, the fourth processing unit further includes two fourth ball valves disposed on the third pipeline and located at two sides of the first control valve, a fourth pipeline having two ends communicated with the third pipeline, and a fifth ball valve disposed on the fourth pipeline, where one end of the fourth pipeline is communicated between one of the fourth ball valves and the second ball valve, and the other end of the fourth pipeline is communicated between the other of the fourth ball valves and the third ball valve.
Preferably, the first processing unit comprises a fifth pipeline, a first valve bank, a condensing fan and a second valve bank, wherein two ends of the fifth pipeline are communicated with the outlet of the first process tower and the inlet of the wastewater tank respectively, the first valve bank, the condensing fan and the second valve bank are sequentially arranged on the fifth pipeline along the direction from the first process tower to the wastewater tank, the first valve bank comprises two check valves which are connected in parallel, and the second valve bank comprises two sixth ball valves which are connected in parallel.
Further preferably, the first processing unit further comprises a sixth pipeline communicated with the condensing fan and a seventh ball valve arranged on the sixth pipeline.
Preferably, the second processing unit further includes a first flow meter disposed on the first pipeline and located between the wastewater tank and the first ball valve, eighth ball valves disposed on the first pipeline and located on two sides of the first flow meter, respectively, a seventh pipeline having two ends communicated with the first pipeline, and a ninth ball valve disposed on the seventh pipeline, wherein one end of the seventh pipeline is communicated with the first pipeline between one of the eighth ball valves and the wastewater tank, and the other end of the seventh pipeline is communicated with the first pipeline between the other of the eighth ball valves and the first ball valve.
Further preferably, the second treatment unit further comprises an eighth pipeline and a tenth ball valve, wherein two ends of the eighth pipeline are respectively communicated with the outlet of the wastewater tank and the inlet of the stripping tower, and the tenth ball valve is arranged on the eighth pipeline.
Preferably, the third processing unit further includes a second flow meter and a second regulating valve sequentially disposed on the second pipeline along a direction from the first pump to the first process tower, two eleventh ball valves disposed on the second pipeline and respectively located at two sides of the second flow meter, two twelfth ball valves disposed on the second pipeline and respectively located at two sides of the second regulating valve, a ninth pipeline and a tenth pipeline having two ends respectively communicated with the second pipeline, a thirteenth ball valve disposed on the ninth pipeline, and a first throttle valve disposed on the tenth pipeline, one end of the ninth pipeline is communicated between one of the eleventh ball valves and the first pump, the other end of the ninth pipeline is communicated between the eleventh ball valve and the twelfth ball valve which are close to each other, and one end of the tenth pipeline is communicated between one of the twelfth ball valves and the first process tower, The other end of the ball valve is communicated between the twelfth ball valve and the eleventh ball valve which are close to each other.
Further preferably, the third processing unit further includes a heat exchanger which is communicated with the second pipeline and is located between the first pump and the second flowmeter, an eleventh pipeline of which two ends are respectively communicated with the first pump and the wastewater tank, and a second throttle valve which is arranged on the eleventh pipeline.
Preferably, the treatment system further comprises a fifth treatment unit, and the fifth treatment unit comprises a twelfth pipeline communicated with the lower outlet of the first process tower, and a second pump and a fourteenth ball valve which are sequentially arranged on the twelfth pipeline along the direction far away from the first process tower.
Further preferably, the treatment system further comprises a thirteenth pipeline and a third throttle valve, wherein two ends of the thirteenth pipeline are respectively communicated with the inlet at the lower part of the first process tower and the twelfth pipeline, and the third throttle valve is arranged on the thirteenth pipeline.
Due to the application of the technical scheme, compared with the prior art, the utility model has the following advantages: according to the esterification wastewater treatment system, due to the arrangement of the fourth treatment unit, when the first process tower outputs esterification wastewater containing excessive glycol due to reduction of treatment capacity, the first pipeline and the third pipeline can be switched by closing the first ball valve and opening the second ball valve, the first control valve and the third ball valve, so that the esterification wastewater does not flow to the stripping tower any more and flows to the second process tower for treatment, and the service life of the stripping tower is prolonged.
Drawings
FIG. 1 is a schematic diagram of a processing system in an embodiment of the utility model.
In the figure: a first process column; 2. a waste water tank; 3. a stripping column; 4. a first pipeline; 5. a first ball valve; 6. a second pipeline; 7. a first pump; 8. a third pipeline; 9. a second process column; 10. a second ball valve; 11. a first control valve; 12. a third ball valve; 13. a fourth ball valve; 14. a fourth pipeline; 15. a fifth ball valve; 16. a fifth pipeline; 17. a first valve block; 17a, a check valve; 18. a condensing fan; 19. a second valve block; 19a, a sixth ball valve; 20. a sixth pipeline; 21. a seventh ball valve; 22. a first flow meter; 23. an eighth ball valve; 24. a seventh pipeline; 25. a ninth ball valve; 26. an eighth pipeline; 27. a tenth ball valve; 28. a second flow meter; 29. a second regulating valve; 30. an eleventh ball valve; 31. a twelfth ball valve; 32. a ninth conduit; 33. a tenth pipeline; 34. a thirteenth ball valve; 35. a first throttle valve; 36. a heat exchanger; 37. an eleventh line; 38. a second throttle valve; 39. a twelfth pipeline; 40. a second pump; 41. a fourteenth ball valve; 42. a thirteenth pipeline; 43. and a third throttle valve.
Detailed Description
The technical scheme of the utility model is further explained by combining the attached drawings.
The utility model relates to an improved treatment system for esterification wastewater, which is characterized in that through the arrangement of a fourth treatment unit, when the first process tower 1 outputs esterification wastewater containing excessive glycol due to the reduction of treatment capacity, the first pipeline 4 and the third pipeline 8 can be switched by closing a first ball valve 5 and opening a second ball valve 10, a first control valve 11 and a third ball valve 12, so that the esterification wastewater does not flow to a stripping tower 3 any more and flows to a second process tower 9 for treatment, and the service life of the stripping tower 3 is prolonged.
Referring to fig. 1, there is shown an esterification wastewater treatment system for a polyester process, comprising a first process tower 1, a wastewater tank 2, a stripping tower 3, a first treatment unit arranged between an upper outlet of the first process tower 1 and an inlet of the wastewater tank 2, a second treatment unit arranged between an outlet of the wastewater tank 2 and an inlet of the stripping tower 3, and a third treatment unit arranged between an outlet of the wastewater tank 2 and an upper inlet of the first process tower 1, wherein the second treatment unit comprises a first pipeline 4 with two ends respectively communicated with the outlet of the wastewater tank 2 and the inlet of the stripping tower 3, and a first ball valve 5 arranged on the first pipeline 4, the third treatment unit comprises a second pipeline 6 with two ends respectively communicated with the outlet of the wastewater tank 2 and the upper inlet of the first process tower 1, and a first pump 7 arranged on the second pipeline 6, and a fourth treatment unit comprising a third pipeline 8 with one end communicated with the second pipeline 6 between the first pump 7 and the first process tower 1 The second process tower 9 is communicated with the other end of the third pipeline 8, and the second ball valve 10, the first control valve 11 and the third ball valve 12 are sequentially arranged on the third pipeline 8 along the direction from the second pipeline 6 to the second process tower 9, wherein the second ball valve 10 and the third ball valve 12 are respectively arranged close to the first pump 7 and the second process tower 9.
Thus, when the pipeline needs to be switched, the first ball valve 5 is closed, so that the esterification wastewater stops flowing into the stripping tower 3; then, the second ball valve 10 and the third ball valve 12 are opened, the first control valve 11 is slightly opened, the first pump 7 can slowly send the esterification wastewater in the wastewater tank 2 to the second process tower 9 through the third pipeline 8 for treatment, the water amount is not too large, preferably 300-400kg/h, and the temperature of the tray of the second process tower 9 is ensured to be stable.
Further, the fourth processing unit further includes two fourth ball valves 13 disposed on the third pipeline 8 and respectively located at two sides of the first control valve 11, a fourth pipeline 14 having two ends respectively communicated with the third pipeline 8, and a fifth ball valve 15 disposed on the fourth pipeline 14, wherein one end of the fourth pipeline 14 is communicated between one of the fourth ball valves 13 and the second ball valve 10, and the other end is communicated between the other one of the fourth ball valves 13 and the third ball valve 12. Here, when the first control valve 11 malfunctions, the third line 8 may be manually disconnected by closing the two fourth ball valves 13, and the fifth ball valve 15 is opened to allow the esterification wastewater to flow into the second process tower 9 through the fourth line 14.
The first processing unit comprises a fifth pipeline 16, a first valve bank 17, a condensing fan 18 and a second valve bank 19, wherein two ends of the fifth pipeline 16 are communicated with an outlet of the first process tower 1 and an inlet of the wastewater tank 2 respectively, the first valve bank 17, the condensing fan 18 and the second valve bank 19 are sequentially arranged on the fifth pipeline 16 along the direction from the first process tower 1 to the wastewater tank 2, the first valve bank 17 comprises two check valves 17a which are connected in parallel, and the second valve bank 19 comprises two sixth ball valves 19a which are connected in parallel. The condensation fan 18 is used for condensing the esterification waste gas output by the first process tower 1 into esterification waste water and conveying the esterification waste water to the waste water tank 2, two sixth ball valves 19a connected in parallel are used for controlling the esterification waste water in the condensation fan 18 to flow to the waste water tank 2, and two check valves 17a connected in parallel can prevent the esterification waste water in the condensation fan 18 from flowing back to the first process tower 1.
Further, the first processing unit further comprises a sixth pipeline 20 communicated with the condensing fan 18, and a seventh ball valve 21 arranged on the sixth pipeline 20. Here a sixth line 20 is used to discharge some of the aldehyde off-gas.
The second processing unit further comprises a first flow meter 22 arranged on the first pipeline 4 and positioned between the wastewater tank 2 and the first ball valve 5, eighth ball valves 23 arranged on the first pipeline 4 and positioned on two sides of the first flow meter 22 respectively, a seventh pipeline 24 with two ends communicated with the first pipeline 4 respectively, and a ninth ball valve 25 arranged on the seventh pipeline 24, wherein one end of the seventh pipeline 24 is communicated with the first pipeline 4 between one of the eighth ball valves 23 and the wastewater tank 2, and the other end of the seventh pipeline 24 is communicated with the first pipeline 4 between the other eighth ball valve 23 and the first ball valve 5.
When the ethylene glycol content in the esterification wastewater is normal, the first pipeline 4 is used for normally conveying the esterification wastewater in the wastewater tank 2 to the stripping tower 3 for treatment, the first flow meter 22 is used for monitoring the flow, and when the first flow meter 22 fails, the first pipeline 4 can be manually disconnected by closing the two eighth ball valves 23, and the ninth ball valve 25 is opened, so that the esterification wastewater flows to the stripping tower 3 through the seventh pipeline 24.
Further, the second processing unit further comprises an eighth pipeline 26, two ends of which are respectively communicated with the outlet of the wastewater tank 2 and the inlet of the stripping tower 3, and a tenth ball valve 27 arranged on the eighth pipeline 26. The eighth line 26 here communicates with the bottom of the waste water tank 2 for draining the waste water in the waste water tank 2 at shut down.
The third processing unit further comprises a second flow meter 28 and a second regulating valve 29 which are sequentially arranged on the second pipeline 6 along the direction from the first pump 7 to the first process tower 1, two eleventh ball valves 30 which are arranged on the second pipeline 6 and are respectively positioned at two sides of the second flow meter 28, two twelfth ball valves 31 which are arranged on the second pipeline 6 and are respectively positioned at two sides of the second regulating valve 29, a ninth pipeline 32 and a tenth pipeline 33 of which two ends are respectively communicated with the second pipeline 6, a thirteenth ball valve 34 arranged on the ninth pipeline 32, and a first throttle valve 35 arranged on the tenth pipeline 33, the ninth pipe 32 has one end connected between one of the eleventh ball valves 30 and the first pump 7 and the other end connected between the eleventh ball valve 30 and the twelfth ball valve 31 which are close to each other, one end of the tenth pipeline 33 is communicated between one of the twelfth ball valves 31 and the first process tower 1, and the other end is communicated between the twelfth ball valve 31 and the eleventh ball valve 30 which are close to each other.
In the esterification process, a part of the esterification wastewater enters the stripping tower 3 or the second process tower 9 for treatment, and the other part of the esterification wastewater is returned to the first process tower 1 for treatment through the second pipeline 6, wherein the second flow meter 28 and the second regulating valve 29 are respectively used for monitoring the flow passing through the second pipeline 6 and controlling the on-off of the second pipeline 6, the two eleventh ball valves 30 and the two twelfth ball valves 31 are respectively used for disconnecting the second pipeline 6 when the second flow meter 28 and the second regulating valve 29 fail, and the thirteenth ball valve 34 and the first throttling valve 35 are used for closing and connecting the ninth pipeline 32 and the tenth pipeline 33 when the failure occurs.
The third processing unit further comprises a heat exchanger 36 communicated with the second pipeline 6 and positioned between the first pump 7 and the second flow meter 28, an eleventh pipeline 37 with two ends respectively communicated with the first pump 7 and the wastewater tank 2, and a second throttle valve 38 arranged on the eleventh pipeline 37. Here, cooling water with a temperature of about 26 ℃ is respectively introduced into a medium inlet and a medium outlet of the heat exchanger 36, the esterification wastewater pumped by the first pump 7 is firstly sent into the heat exchanger 36 for heat exchange, and then sent to the first process tower 1 or the second process tower 9, and the heat exchange has the function of reducing the temperature of the esterification wastewater, so that the ethylene glycol and the water are easier to separate.
In this embodiment, the treatment system further comprises a fifth treatment unit, wherein the fifth treatment unit comprises a twelfth pipeline 39 communicated with the lower outlet of the first process tower 1, a second pump 40 and a fourteenth ball valve 41 sequentially arranged on the twelfth pipeline 39 along the direction far away from the first process tower 1. The fifth treatment unit is used for recycling the heavy component ethylene glycol in the lower part of the first process tower 1 and for pulp preparation.
Further, the treatment system further comprises a thirteenth pipeline 42 with two ends respectively communicated with the inlet at the lower part of the first process tower 1 and the twelfth pipeline 39, and a third throttle valve 43 arranged on the thirteenth pipeline 42. A thirteenth line 42 serves for returning the incompletely consumed heavy ethylene glycol back to the first process column 1.
The following specifically explains the working process of this embodiment:
in normal operation, the sixth ball valve 19a, the first ball valve 5 and the second regulating valve 29 are opened, and the esterification wastewater can flow into the wastewater tank 2 from the first process tower 1 through the fifth pipeline 16, then one part of the esterification wastewater flows into the stripping tower 3 from the first pipeline 4 for treatment, and the other part of the esterification wastewater flows back into the first process tower 1 from the second pipeline 6 for treatment;
when the pipeline needs to be switched, the first ball valve 5 is closed, so that the esterification wastewater stops flowing into the stripping tower 3; then, the second ball valve 10 and the third ball valve 12 are opened, the first control valve 11 is slightly opened, the first pump 7 can slowly send the esterification wastewater in the wastewater tank 2 to the second process tower 9 through the third pipeline 8 for treatment, the water amount is not too large, preferably 300-400kg/h, and the temperature of the tray of the second process tower 9 is ensured to be stable.
The above embodiments are merely illustrative of the technical ideas and features of the present invention, and the purpose thereof is to enable those skilled in the art to understand the contents of the present invention and implement the present invention, and not to limit the protection scope of the present invention. All equivalent changes and modifications made according to the spirit of the present invention should be covered within the protection scope of the present invention.
Claims (10)
1. The utility model provides an esterification wastewater treatment system that polyester technology was used, includes first technology tower, waste water jar, strip tower, locates first technology tower upper portion export with first processing unit between the waste water jar import, locate waste water jar export with second processing unit between the strip tower import, locate waste water jar export with third processing unit between the import of first technology tower upper portion, second processing unit include both ends respectively with waste water jar export with the first pipeline that the strip tower import is linked together, locate first ball valve on the first pipeline, third processing unit include both ends respectively with waste water jar export with the second pipeline that first technology tower upper portion import is linked together, locate first pump on the second pipeline, its characterized in that: the processing system further comprises a fourth processing unit, wherein the fourth processing unit comprises a third pipeline, a second process tower and a second ball valve, the third pipeline is communicated with one end of the second pipeline between the first pump and the first process tower, the second process tower is communicated with the other end of the third pipeline, the second ball valve, the first control valve and the third ball valve are sequentially arranged on the third pipeline along the direction from the second pipeline to the second process tower, and the second ball valve and the third ball valve are respectively close to the first pump and the second process tower.
2. The esterification wastewater treatment system for the polyester process according to claim 1, wherein: the fourth processing unit further comprises two fourth ball valves arranged on the third pipeline and respectively positioned at two sides of the first control valve, a fourth pipeline with two ends respectively communicated with the third pipeline, and a fifth ball valve arranged on the fourth pipeline, wherein one end of the fourth pipeline is communicated between one of the fourth ball valves and the second ball valve, and the other end of the fourth pipeline is communicated between the other one of the fourth ball valves and the third ball valve.
3. The esterification wastewater treatment system for the polyester process according to claim 1, wherein: the first treatment unit comprises a fifth pipeline, a first process tower, a condensation fan and a second valve bank, wherein the two ends of the fifth pipeline are communicated with the outlet of the first process tower and the inlet of the wastewater tank respectively, the first valve bank, the condensation fan and the second valve bank are sequentially arranged in the direction from the first process tower to the wastewater tank, the first valve bank comprises two check valves which are connected in parallel, and the second valve bank comprises two sixth ball valves which are connected in parallel.
4. The esterification wastewater treatment system for the polyester process according to claim 3, wherein: the first processing unit further comprises a sixth pipeline communicated with the condensing fan and a seventh ball valve arranged on the sixth pipeline.
5. The esterification wastewater treatment system for the polyester process according to claim 1, wherein: the second processing unit further comprises a first flowmeter arranged on the first pipeline and positioned between the wastewater tank and the first ball valve, eighth ball valves arranged on the first pipeline and positioned on two sides of the first flowmeter respectively, a seventh pipeline with two ends communicated with the first pipeline respectively, and a ninth ball valve arranged on the seventh pipeline, wherein one end of the seventh pipeline is communicated with the first pipeline between one of the eighth ball valves and the wastewater tank, and the other end of the seventh pipeline is communicated with the first pipeline between the other one of the eighth ball valves and the first ball valve.
6. An esterification wastewater treatment system for polyester process according to claim 1 or 5, wherein: the second processing unit further comprises an eighth pipeline and a tenth ball valve, wherein the two ends of the eighth pipeline are communicated with the outlet of the wastewater tank and the inlet of the stripping tower respectively, and the tenth ball valve is arranged on the eighth pipeline.
7. The esterification wastewater treatment system for the polyester process according to claim 1, wherein: the third processing unit further comprises a second flowmeter and a second regulating valve which are sequentially arranged on the second pipeline along the direction from the first pump to the first process tower, two eleventh ball valves which are arranged on the second pipeline and are respectively positioned at two sides of the second flowmeter, two twelfth ball valves which are arranged on the second pipeline and are respectively positioned at two sides of the second regulating valve, a ninth pipeline and a tenth pipeline with two ends respectively communicated with the second pipeline, a thirteenth ball valve arranged on the ninth pipeline, and a first throttle valve arranged on the tenth pipeline, wherein one end of the ninth pipeline is communicated between one of the eleventh ball valves and the first pump, the other end of the ninth pipeline is communicated between the eleventh ball valve and the twelfth ball valve which are close to each other, and one end of the tenth pipeline is communicated between one of the twelfth ball valves and the first process tower, The other end of the ball valve is communicated between the twelfth ball valve and the eleventh ball valve which are close to each other.
8. The esterification wastewater treatment system for the polyester process according to claim 7, wherein: the third processing unit further comprises a heat exchanger which is communicated with the second pipeline and is positioned between the first pump and the second flowmeter, an eleventh pipeline of which two ends are respectively communicated with the first pump and the waste water tank, and a second throttle valve which is arranged on the eleventh pipeline.
9. The esterification wastewater treatment system for the polyester process according to claim 1, wherein: the treatment system also comprises a fifth treatment unit, wherein the fifth treatment unit comprises a twelfth pipeline communicated with the outlet at the lower part of the first process tower, a second pump and a fourteenth ball valve which are sequentially arranged on the twelfth pipeline along the direction far away from the first process tower.
10. The esterification wastewater treatment system for the polyester process according to claim 9, wherein: the treatment system also comprises a thirteenth pipeline and a third throttle valve, wherein the two ends of the thirteenth pipeline are respectively communicated with the inlet at the lower part of the first process tower and the twelfth pipeline, and the third throttle valve is arranged on the thirteenth pipeline.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122604934.4U CN215947033U (en) | 2021-10-28 | 2021-10-28 | Esterification wastewater treatment system for polyester process |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122604934.4U CN215947033U (en) | 2021-10-28 | 2021-10-28 | Esterification wastewater treatment system for polyester process |
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| Publication Number | Publication Date |
|---|---|
| CN215947033U true CN215947033U (en) | 2022-03-04 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202122604934.4U Active CN215947033U (en) | 2021-10-28 | 2021-10-28 | Esterification wastewater treatment system for polyester process |
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| CN (1) | CN215947033U (en) |
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2021
- 2021-10-28 CN CN202122604934.4U patent/CN215947033U/en active Active
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