CN213506069U - Processing apparatus who contains salt waste water - Google Patents
Processing apparatus who contains salt waste water Download PDFInfo
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- CN213506069U CN213506069U CN202022557439.8U CN202022557439U CN213506069U CN 213506069 U CN213506069 U CN 213506069U CN 202022557439 U CN202022557439 U CN 202022557439U CN 213506069 U CN213506069 U CN 213506069U
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Abstract
The utility model discloses a processing apparatus who contains salt waste water, it includes the device main part, set up in the inside baffle of device main part, set up in the air passage in the device main part outside, the baffle divide into dehumidification district and humidification district with device main part top-down, it is provided with the cap that rises to correspond the dehumidification district on the baffle, air passage's both ends respectively with the dehumidification district, humidification district intercommunication, the valve member through setting up on the control air passage realizes the transformation of whole device open system and closed system, it is provided with high temperature waste water spray set to correspond the humidification district in the device main part, it is provided with cooling water spray set to correspond the dehumidification district, the upper surface department that corresponds the baffle in the device main part is provided with the water purification export, the bottom of device main part is provided with concentrated. The utility model discloses can pass through the fresh water that various concentrations contained in the salt waste water and dehumidify the process extraction separation and come out of humidification to in addition recycle, realized containing the resourceization, the minimizing of salt waste water.
Description
Technical Field
The utility model relates to a waste water treatment equipment field, more specifically the saying so, it relates to a processing apparatus who contains salt waste water.
Background
In industrial production operation systems of various industries, along with the progress of production activities, a large amount of salt-containing wastewater is inevitably generated, and the salt-containing wastewater generally contains high inorganic ions such as Cl, especially high-concentration salt-containing wastewater-，SO4 2-，Na+，Ca2+And the like, and also organic substances such as humic acid, halogenated organic substances, aromatic organic substances, and the like which are difficult to biodegrade. The salt-containing wastewater has complex and various components and high salinity, has stronger inhibiting effect on the growth of microorganisms, and cannot be removed through the biodegradation effect, so the technical difficulty of the salt-containing wastewater treatment is far higher than that of the common sewage treatment.
At present, the salt-containing wastewater treatment method comprises a physical method and a chemical method, such as a thermal separation method, a membrane separation method, an ion exchange method, an electrodialysis method and other separation and concentration methods, along with the improvement of the concentration degree, the concentration of inorganic salt ions in the wastewater is continuously improved, and the device can be scaled and blocked after long-time operation, so that the operation and maintenance cost is greatly improved, and meanwhile, the subsequent treatment is more and more difficult, and the discharge of the wastewater and the recycling of water resources are influenced.
SUMMERY OF THE UTILITY MODEL
Based on all kinds of insufficiencies of prior art, in order to solve the processing difficult problem that contains salt waste water, realize containing the minimizing and the utilization of resources of salt waste water, provide a processing apparatus who contains salt waste water to provide following technical scheme:
a salt-containing wastewater treatment device, which comprises a device main body, a clapboard arranged inside the device main body, and an air channel arranged outside the device main body, the clapboard divides the interior of the device main body into a dehumidification area and a humidification area from top to bottom, the clapboard is provided with an air lifting cap corresponding to the dehumidification area, an air inlet and an air outlet are arranged on the main body corresponding to the connection part of the air channel, the air inlet is communicated with the dehumidification area, the air outlet is communicated with the humidifying area, the device main body is provided with a high-temperature waste water spraying device corresponding to the humidifying area, a cooling water spraying device corresponding to the dehumidifying area, the high-temperature waste water spraying device is positioned between the air inlet and the partition plate, the cooling water spraying device is positioned between the air outlet and the partition plate, the device is characterized in that a purified water outlet is formed in the position, corresponding to the upper surface of the partition plate, of the device body, and a concentrated wastewater discharge port is formed in the bottom of the device body.
Further, high temperature waste water spray set is first shower, the one end of first shower is provided with high temperature waste water inlet, and the other end is the blind end, evenly set up a plurality of first nozzles and each first nozzle export and all set up the baffle dorsad on the first shower, cooling water spray set is the second shower, the one end of second shower is provided with the cooling water inlet, and the other end is the blind end, evenly set up a plurality of second nozzles and each second nozzle export and all set up towards the baffle on the second shower.
Further, the inside bottom of device main part corresponds humidification district waste water thick liquid pond, concentrated wastewater discharge port is located the bottom in waste water thick liquid pond, it is provided with waste water slip casting mouth and waste water circulation mouth to correspond waste water thick liquid pond department in the device main part, waste water slip casting mouth is located between air inlet and the concentrated wastewater discharge port, waste water circulation mouth is located between waste water slip casting mouth and the concentrated wastewater discharge port, waste water circulation mouth passes through the outside pipeline and is connected with high temperature waste water inlet, it is used for containing salt waste water in the waste water thick liquid pond through the circulating pump that waste water circulation mouth was taken out and the heating device who contains salt waste water heating that will take out to connect gradually on the outside pipeline.
Further, a first packing layer used for increasing the contact area of the dry cold air and the high-temperature salt-containing wastewater is arranged in the humidification region, and the first packing layer is located between the air inlet and the high-temperature wastewater spraying device.
Further, still be provided with the rectification equipartition device that is used for the equipartition air and increases dry cold air and high temperature and contain salt waste water area of contact in the humidification district, the rectification equipartition device is located between first packing layer and the air inlet.
Furthermore, a second packing layer used for increasing the contact area of the high-temperature saturated humid air and the cooling water is arranged in the dehumidification area, and the second packing layer is located between the partition plate and the cooling water spraying device.
Furthermore, a demister used for capturing and collecting small liquid drops carried in the cooled humid air is arranged in the dehumidification area, and the demister is positioned between the cooling water spraying device and the air outlet.
Furthermore, the air channel comprises a circulating air pipe and a fan arranged on the circulating air pipe, one end of the circulating air pipe is communicated with the humidifying area through an air inlet, and the other end of the circulating air pipe is communicated with the dehumidifying area through an air outlet.
Furthermore, the air channel further comprises an air inlet pipe connected with the circulating air pipe, the air inlet pipe is located between the fan and the air outlet, and an air inlet pipe valve component is arranged on the air inlet pipe.
Further, the air passage is still including being located the device main part top and with the exhaust pipe of dehumidification district intercommunication, circulation tuber pipe and exhaust pipe intercommunication, be provided with the exhaust pipe valve subassembly on the exhaust pipe, be located and be provided with middle valve subassembly on the circulation tuber pipe between exhaust pipe valve subassembly and the intake air pipe valve subassembly.
To sum up, the utility model discloses compare and have following beneficial effect in prior art:
(1) the utility model discloses can extract the fresh water in the salt waste water of various concentrations through the humidification dehumidification processing procedure and isolate to in addition recycle realizes the resourceization that contains salt waste water.
(2) The switching between the open system and the closed system of the whole device can be realized by controlling the corresponding valve assembly arranged on the air channel.
(3) And collecting the generated high-concentration concentrated wastewater, and then carrying out dehydration crystallization treatment to realize the reduction and the harmlessness of the saline wastewater.
Drawings
FIG. 1 is a schematic view showing the overall construction of a salt-containing wastewater treatment apparatus according to embodiment 1;
in the figure: 1. a wastewater circulation port; 2. a waste water grouting port; 3. a device main body; 4. a rectification uniform distribution device; 5. a high-temperature wastewater spraying device; 6. a purified water outlet; 7. a cooling water spray device; 8. a demister; 9. an exhaust duct valve component; 101. an outer exhaust pipe; 102. a circulating air duct; 103. an air inlet duct; 111. a second packing layer; 112. a first filler layer; 12. a ventilation cap; 13. a partition plate; 14. an air inlet pipe valve component; 15. a fan; 16. an intermediate valve assembly; 17. a concentrated wastewater discharge port; 18. a waste water slurry pond.
Detailed Description
In order to make those skilled in the art better understand the technical solution of the present invention, the following description, together with the drawings of the present invention, clearly and completely describes the technical solution of the present invention, and based on the embodiments in the present application, other similar embodiments obtained by those skilled in the art without creative efforts shall all belong to the protection scope of the present application. In addition, directional terms such as "upper", "lower", "left", "right", etc. in the following embodiments are directions with reference to the drawings only, and thus, the directional terms are used for illustrating the present invention and not for limiting the present invention.
Detailed description of the preferred embodiment 1
A treatment device for salt-containing wastewater is disclosed, as shown in figure 1, and comprises a device body 3, a partition plate 13 arranged inside the device body 3, and an air channel arranged outside the device body 3, wherein the partition plate 13 divides the inside of the device body 3 into a dehumidification region and a humidification region from top to bottom, an air lift cap 12 is arranged on the partition plate 13 corresponding to the dehumidification region, an air inlet and an air outlet are arranged on the device body 3 corresponding to the connection of the air channel, the air inlet is communicated with the humidification region, the air outlet is communicated with the dehumidification region, a high-temperature wastewater spray device 5 is arranged on the device body 3 corresponding to the humidification region, a cooling water spray device 7 is arranged on the device body corresponding to the dehumidification region, the high-temperature wastewater spray device 5 is arranged between the air inlet and the partition plate 13, the cooling water spray device 7 is arranged between the air outlet of the air channel and the partition plate 13, and a purified water outlet 6, the bottom of the device main body 3 is provided with a concentrated waste water discharge port 17 corresponding to the humidification region.
Specifically, the partition 13 is connected to the inner wall of the main body 3 and has a certain inclination angle along the direction of the purified water outlet 6, which is beneficial to discharge all the liquid generated in the upper dehumidification region from the purified water outlet 6.
Specifically, the plurality of air lifting caps 12 are uniformly arranged on the partition plate 13, and the water isolating device is arranged at the top of the air lifting caps 12 to prevent liquid generated in the upper dehumidifying area from entering the lower humidifying area to influence the normal operation of the whole device.
Further, the high-temperature wastewater spraying device 5 is a first spraying pipe, one end of the first spraying pipe is provided with a high-temperature wastewater inlet, the other end of the first spraying pipe is a closed end, a plurality of first nozzles are uniformly arranged on the first spraying pipe, and outlets of the first nozzles are arranged back to the partition plate 13.
Specifically, the high-temperature waste water inside is atomized and sprayed downwards at a high speed through the outlets of the first nozzles by the first spray pipes, the contact area of the dry cold air and the high-temperature waste water is increased, and the mass transfer and heat exchange efficiency is improved.
Specifically, the main pipe and the branch pipes on the first spraying pipe adopt a reducing design, so that the pressure and the flow at the outlet of each nozzle arranged on the main pipe and the branch pipes are consistent, and the atomization spraying effect is ensured.
Specifically, the angle of the first nozzle close to the inner wall of the device main body 3 is properly adjusted to enable the spraying direction of the outlet of the first nozzle to deviate from the wall plate, so that the damage to the wall plate caused by direct washing of slurry is avoided, and the service life of the whole wastewater treatment device is prolonged.
Preferably, the first nozzle is a centrifugal cone type nozzle.
Furthermore, the cooling water spraying device 7 is a second spraying pipe, one end of the second spraying pipe is provided with a cooling water inlet, the other end of the second spraying pipe is a closed end, the second spraying pipe is evenly provided with a plurality of second nozzles, and outlets of the second nozzles are all arranged towards the partition plate 13.
Specifically, the second spray pipe atomizes and sprays the cooling water inside downwards at a high speed through the outlets of the second nozzles, so that the contact area of the high-temperature saturated wet air and the cooling water is increased, and the mass transfer and heat exchange efficiency is improved.
Specifically, the main pipe and the branch pipes on the second spray pipe adopt a reducing design, so that the pressure and the flow at the outlet of each nozzle arranged on the main pipe and the branch pipes are consistent, and the atomization spraying effect is ensured.
Specifically, the angle of the second nozzle close to the inner wall of the device main body 3 is properly adjusted to enable the spraying direction of the outlet of the second nozzle to deviate from the wall plate, damage to the wall plate due to direct washing of slurry is avoided, and the service life of the whole wastewater treatment device is prolonged.
Preferably, the second nozzle is a centrifugal cone type nozzle.
Further, 3 bottoms of device main part correspond waste water thick liquid pond 18, concentrated wastewater discharge port 17 is located the bottom in waste water thick liquid pond 18, it is provided with waste water slip casting mouth 2 and waste water circulation mouth 1 to correspond waste water thick liquid pond 18 department on device main part 3, waste water slip casting mouth 2 is located between air inlet and the concentrated wastewater discharge port 17, waste water circulation mouth 1 is located between waste water slip casting mouth 2 and the concentrated wastewater discharge port 17, waste water circulation mouth 1 is connected with the high temperature waste water inlet through outside pipeline, it is used for containing salt waste water in waste water thick liquid pond 18 through the circulating pump that waste water circulation mouth 1 was taken out and the heating device who contains salt waste water heating that will take out to connect gradually on the outside pipeline.
Specifically, the wastewater grouting port 2 and the wastewater circulating port 1 are both arranged below the liquid level in the wastewater slurry pool 18, the bottom of the wastewater slurry pool 18 is conical, and the concentrated wastewater discharge port 17 is arranged at the bottom of the conical wastewater slurry pool 18 and is used for facilitating the discharge of high-concentration concentrated wastewater.
Further, a first packing layer 112 used for increasing the contact area of the dry cold air and the high-temperature salt-containing wastewater is arranged in the humidifying area, and the first packing layer is positioned between the air inlet and the high-temperature wastewater spraying device 5.
Specifically, the first packing layer is made of a material with good corrosion resistance, and the effect of increasing the contact area of the dry cold air and the high-temperature salt-containing wastewater is achieved.
Further, a rectification uniform distribution device 4 used for uniformly distributing air and increasing the contact area of the dry cold air and the high-temperature salt-containing wastewater is further arranged in the humidification region, and the rectification uniform distribution device 4 is located between the first packing layer 112 and the air inlet.
Specifically, the rectification and uniform distribution device 4 is in a grid type or a pore plate type, and has the function of improving the contact area of air and liquid while uniformly distributing air and optimizing a flow field.
Further, a second packing layer 111 for increasing the contact area of the high-temperature saturated humid air and the cooling water is arranged in the dehumidification region, and the second packing layer is located between the partition plate 13 and the cooling water spraying device 7.
Specifically, the second packing layer is made of a material with good corrosion resistance, and the effect of increasing the contact area of the high-temperature saturated humid air and the cooling water is achieved.
Furthermore, a demister 8 for capturing and collecting small liquid drops carried in the cooled humid air is arranged in the dehumidification area, the moisture in the air is further recovered, and the demister 8 is positioned between the cooling water spraying device 7 and the air outlet.
Further, the air passage includes a circulating air pipe 102 respectively communicated with the humidification region and the dehumidification region, and a fan 15 disposed on the circulating air pipe 102, and the air inlet and the air outlet are respectively located at two ends of the circulating air pipe 102.
Further, the air channel further comprises an air inlet pipe 103 connected with the circulating air pipe 102, the air inlet pipe 103 is located between the fan 15 and the air outlet, and an air inlet pipe valve assembly 14 is arranged on the air inlet pipe 103.
Further, the air passage further comprises an exhaust pipe which is positioned at the top of the device main body 3 and is communicated with the dehumidification area, the circulating air pipe 102 is communicated with the exhaust pipe, an exhaust pipe valve component 9 is arranged on the exhaust pipe, and an intermediate valve component 16 is arranged on the circulating air pipe 102 which is positioned between the exhaust pipe valve component 9 and the air inlet pipe valve component 14. The switching between the open system and the closed system of the whole saline wastewater treatment device can be realized by controlling the opening and closing of the air inlet pipe valve assembly 14, the exhaust pipe valve assembly 9 and the intermediate valve assembly 16.
During the specific use, contain salt waste water and pour into waste water thick liquid pond 18 into through waste water slip casting mouth 2, when the liquid level of waste water thick liquid pond 18 reaches the setting value that is located between waste water slip casting mouth 2 and the air inlet of circulated air pipe 102, start the circulating pump of outside setting, will contain salt waste water through waste water circulation mouth 1 and take out, the heating device who connects simultaneously on the outside pipeline with the salt waste water heating of the interior outside pipeline to 65 ℃ -95 ℃ of predetermineeing the temperature, carry high temperature waste water spray set 5 again, evenly atomize through the above-mentioned a plurality of centrifugal cone type nozzles that evenly set up and spray out.
Further, under the effect of the fan 15, the dry cold air flows upwards from the lower part of the rectification uniform distribution device 4, and contacts and exchanges heat with the high-temperature wastewater uniformly distributed on the rectification uniform distribution device 4 to take away part of moisture in the wastewater, so that the temperature and the moisture content in the air are improved to a certain extent. The original high-temperature wastewater enters the wastewater slurry tank 18 for the next circulation.
Further, the air enters the first packing layer 112, contacts with the high-temperature wastewater uniformly distributed in the first packing layer 112 for heat exchange, takes away part of moisture in the high-temperature wastewater, and further improves the temperature and the moisture content of the air.
Further, air enters the lower part of the high-temperature wastewater spraying device 5 and contacts with high-temperature foggy wastewater generated by each first nozzle to exchange heat, partial moisture is taken away when the air passes through the foggy wastewater, and at the moment, original dry cold air is changed into high-temperature saturated wet air.
Further, the cooling water spraying device 7 sprays cooling water with a temperature of 25 ℃ to 45 ℃ through a second nozzle arranged on the cooling water spraying device, and the cooling water is uniformly distributed on the second filler layer 111.
Furthermore, the high-temperature saturated humid air enters the dehumidification area at the upper part of the device through a channel at the side surface of the air lifting cap 12, contacts with the atomized cooling water generated by the second nozzle and the cooling water in the second packing layer 111 for heat exchange, condenses and separates out the moisture in the high-temperature saturated humid air, falls onto the partition plate 13 together with the cooling water sprayed by the cooling water spraying device 7, and is discharged through the purified water outlet 6 along the inclination angle of the partition plate 13. And recycling or discharging the water which is qualified and up to the standard, and inputting the water which is unqualified to be detected into front-end water treatment equipment for retreatment.
Further, the air after condensation and dehumidification continues to flow upwards, and small liquid drops in the air are intercepted and captured by the demister 8 arranged on the device main body 3, so that the water content in the air is further reduced.
Further, when the exhaust pipe valve assembly 9 is closed, the intake pipe valve assembly 14 is closed, and the intermediate valve assembly 16 is opened, the salt-containing wastewater treatment device is a closed system, and air enters the device main body 3 again through the circulation air pipe 102 under the action of the fan 15 for the next circulation.
Further, after the air circulates and runs for a certain time in the device, the exhaust duct valve assembly 9 is opened, and the air enters the external deodorization device through the external exhaust duct 101 to be treated and then is discharged. The exhaust pipe valve assembly 9 is closed, the air inlet pipe valve assembly 14 is opened, and external fresh dry cold air is introduced into the device through the air inlet pipe 103 to perform the circulating operation again.
Further, when the exhaust pipe valve assembly 9 is opened, the intake pipe valve assembly 14 is opened, and the intermediate valve assembly 16 is closed, the salt-containing wastewater treatment device is an open system, and under the action of the fan 15, dry cold air enters the device main body 3 through the intake air pipe 103, and after the humidification and dehumidification treatment process, the dry cold air enters the external deodorization device through the external exhaust air pipe 101 for treatment, and then is discharged.
Further, when the wastewater in the wastewater slurry tank 18 circularly runs for a certain time, and when the concentration multiple, the conductivity and the TDS of the wastewater reach preset values, the wastewater is discharged through a concentrated wastewater discharge port 17 arranged at the lower part of the wastewater, and is subjected to dehydration crystallization treatment after being collected, so that the reduction and the harmlessness of the salt-containing wastewater are realized.
Above only the utility model discloses an it is preferred embodiment, the utility model discloses a scope of protection not only limits in above-mentioned embodiment, and the all belongs to the utility model discloses a technical scheme under the thinking all belongs to the utility model discloses a scope of protection. It should be noted that, for those skilled in the art, various modifications and decorations can be made without departing from the principle of the present invention, and these modifications and decorations should also be regarded as the protection scope of the present invention.
Claims (10)
1. A treatment device for salt-containing wastewater is characterized by comprising a device body, a partition plate arranged in the device body and an air channel arranged outside the device body, wherein the partition plate divides the interior of the device body into a dehumidification area and a humidification area from top to bottom, an air lifting cap is arranged on the partition plate corresponding to the dehumidification area, an air inlet and an air outlet are arranged on the device body corresponding to the connection of the air channel, the air inlet is communicated with the dehumidification area, the air outlet is communicated with the humidification area, a high-temperature wastewater spray device is arranged on the device body corresponding to the humidification area, a cooling water spray device is arranged on the device body corresponding to the dehumidification area, the high-temperature wastewater spray device is positioned between the air inlet and the partition plate, the cooling water spray device is positioned between the air outlet and the partition plate, and a purified water outlet is arranged on the device body corresponding to the upper surface, the bottom of the device main body is provided with a concentrated wastewater discharge port.
2. The salt-containing wastewater treatment device according to claim 1, wherein the high-temperature wastewater spray device is a first spray pipe, one end of the first spray pipe is provided with a high-temperature wastewater inlet, the other end of the first spray pipe is a closed end, a plurality of first nozzles are uniformly arranged on the first spray pipe, each first nozzle outlet is arranged in a way of facing away from the partition plate, the cooling water spray device is a second spray pipe, one end of the second spray pipe is provided with a cooling water inlet, the other end of the second spray pipe is a closed end, a plurality of second nozzles are uniformly arranged on the second spray pipe, and each second nozzle outlet is arranged towards the partition plate.
3. The device for treating salt-containing wastewater according to claim 2, wherein the bottom inside the device body corresponds to a wastewater slurry pool in a humidification region, the concentrated wastewater discharge port is located at the bottom of the wastewater slurry pool, a wastewater injection port and a wastewater circulation port are arranged on the device body corresponding to the wastewater slurry pool, the wastewater injection port is located between the air inlet and the concentrated wastewater discharge port, the wastewater circulation port is located between the wastewater injection port and the concentrated wastewater discharge port, the wastewater circulation port is connected with the high-temperature wastewater inlet through an external pipeline, and the external pipeline is sequentially connected with a circulating pump for pumping out salt-containing wastewater in the wastewater slurry pool through the wastewater circulation port and a heating device for heating the pumped salt-containing wastewater.
4. The device for treating salt-containing wastewater according to claim 1, wherein a first packing layer for increasing the contact area between the dry cold air and the high-temperature salt-containing wastewater is arranged in the humidifying area, and the first packing layer is positioned between the air inlet and the high-temperature wastewater spraying device.
5. The device for treating salt-containing wastewater according to claim 4, wherein a rectification and uniform distribution device for uniformly distributing air and increasing the contact area between the dry cold air and the high-temperature salt-containing wastewater is further arranged in the humidification region, and the rectification and uniform distribution device is positioned between the first packing layer and the air inlet.
6. The saline wastewater treatment device according to claim 1, wherein a second packing layer for increasing the contact area of the high-temperature saturated humid air and the cooling water is arranged in the dehumidification region, and the second packing layer is positioned between the partition plate and the cooling water spraying device.
7. The apparatus for treating salt-containing wastewater according to claim 1, wherein a demister for catching and collecting droplets carried in the cooled humid air is disposed in the dehumidification region, and the demister is located between the cooling water spray device and the air outlet.
8. The saline wastewater treatment device according to claim 1, wherein the air channel comprises a circulating air pipe and a fan arranged on the circulating air pipe, one end of the circulating air pipe is communicated with the humidification region through an air inlet, and the other end of the circulating air pipe is communicated with the dehumidification region through an air outlet.
9. The saline wastewater treatment device according to claim 8, wherein the air channel further comprises an air inlet pipe connected with the circulating air pipe, the air inlet pipe is positioned between the fan and the air outlet, and an air inlet pipe valve assembly is arranged on the air inlet pipe.
10. The saline wastewater treatment device according to claim 9, wherein the air passage further comprises an exhaust pipe positioned at the top of the device body and communicated with the dehumidification region, the circulation air pipe is communicated with the exhaust pipe, an exhaust pipe valve component is arranged on the exhaust pipe, and an intermediate valve component is arranged on the circulation air pipe between the exhaust pipe valve component and the intake pipe valve component.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022557439.8U CN213506069U (en) | 2020-11-06 | 2020-11-06 | Processing apparatus who contains salt waste water |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022557439.8U CN213506069U (en) | 2020-11-06 | 2020-11-06 | Processing apparatus who contains salt waste water |
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| CN213506069U true CN213506069U (en) | 2021-06-22 |
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| CN202022557439.8U Active CN213506069U (en) | 2020-11-06 | 2020-11-06 | Processing apparatus who contains salt waste water |
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| CN (1) | CN213506069U (en) |
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