CN213299629U - A coal gas drainer device for concentrating retrieve waste water - Google Patents
A coal gas drainer device for concentrating retrieve waste water Download PDFInfo
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- CN213299629U CN213299629U CN202022055939.1U CN202022055939U CN213299629U CN 213299629 U CN213299629 U CN 213299629U CN 202022055939 U CN202022055939 U CN 202022055939U CN 213299629 U CN213299629 U CN 213299629U
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- 239000003034 coal gas Substances 0.000 title claims abstract description 21
- 239000002351 wastewater Substances 0.000 title claims abstract description 19
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 221
- 238000009825 accumulation Methods 0.000 claims abstract description 20
- 238000011084 recovery Methods 0.000 claims abstract description 7
- 238000005086 pumping Methods 0.000 claims abstract description 4
- 238000002347 injection Methods 0.000 claims description 12
- 239000007924 injection Substances 0.000 claims description 12
- 238000004891 communication Methods 0.000 claims description 11
- 239000002253 acid Substances 0.000 claims description 9
- 239000003513 alkali Substances 0.000 claims description 9
- 230000003068 static effect Effects 0.000 claims description 5
- 239000002585 base Substances 0.000 claims description 4
- 238000004064 recycling Methods 0.000 claims description 4
- 238000005192 partition Methods 0.000 claims description 3
- 239000010865 sewage Substances 0.000 claims description 3
- PEDCQBHIVMGVHV-UHFFFAOYSA-N Glycerine Chemical compound OCC(O)CO PEDCQBHIVMGVHV-UHFFFAOYSA-N 0.000 claims 3
- 238000004140 cleaning Methods 0.000 claims 1
- 239000012141 concentrate Substances 0.000 claims 1
- 238000007789 sealing Methods 0.000 abstract description 10
- 238000005260 corrosion Methods 0.000 abstract description 5
- 230000007797 corrosion Effects 0.000 abstract description 5
- 230000008859 change Effects 0.000 abstract description 3
- 239000007788 liquid Substances 0.000 description 8
- 230000000903 blocking effect Effects 0.000 description 3
- 230000008676 import Effects 0.000 description 3
- 230000009471 action Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000007613 environmental effect Effects 0.000 description 2
- 238000002955 isolation Methods 0.000 description 2
- 238000012423 maintenance Methods 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 238000012544 monitoring process Methods 0.000 description 2
- 230000015556 catabolic process Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000005202 decontamination Methods 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
- 238000001363 water suppression through gradient tailored excitation Methods 0.000 description 1
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Abstract
The utility model relates to a gas drainer device for centralized recovery of wastewater, which comprises a gas drainer, a pump box and a water receiving pipeline, wherein the gas drainer is connected with an inlet pipe of the pump box, and an outlet pipe of the pump box is connected with the water receiving pipeline; the pump box comprises an electric control part and a waterway part, wherein the electric control part acquires the water level value of the waterway part and compares the water level value with the water level value set in the waterway part; when the collected water level value is larger than the set water level value, the pump box is started, the water collecting pipeline receives high-pressure water discharged by the pump box, and the high-pressure water is collected and discharged to the centralized water pool; otherwise, the pump tank stops pumping. The internal structure of the drainer is simple, hidden danger caused by invisible internal corrosion perforation does not exist, and the water seal grade is randomly adjustable; the required sealing pressure can be set through the elevation change of the pipe orifice on the secondary water seal pipe, and the automatic overflow function is realized when wastewater is automatically and intensively recovered and the drainage is failed; the low water level of the water accumulation bag can still ensure the reliable sealing of the coal gas.
Description
Technical Field
The utility model relates to a gas piping system drainage protection equipment field specifically is a gas drainer device for concentrating recovery waste water.
Background
The gas drainer is a device for collecting positive pressure gas, mechanical water and condensed water in a pipe network, and performs gas sealing and overflow drainage by adding liquid column pressure generated by water and collected water.
The existing gas drainer is divided into a single-chamber structure and a multi-chamber structure, the single-chamber structure is low in sealing pressure, the multi-chamber structure is easy to have internal corrosion, so that pressure sealing and pressure loss are caused, and the drainers of the two structures can generate gas breakdown and leakage risks when the gas pressure fluctuates greatly. Although various leak-proof structures have been designed, they require that the mechanism be capable of reliable operation. It is known that the gas water contains impurities and is corrosive, and the reliable action of the action member cannot be fully guaranteed. In addition, the existing drainers are all designed to be self-overflowing, and damage to the environment is inevitable.
SUMMERY OF THE UTILITY MODEL
The to-be-solved technical problem of the utility model is: in order to solve the problem, the utility model provides a coal gas drainer device for concentrating recovery waste water, reliable operation, and can be under normal operating mode totally closed automatic concentrated recovery waste water.
In order to achieve the above object, the utility model provides a following technical scheme: the utility model provides a coal gas drainer device for concentrating and recovering waste water, including coal gas drainer, pump box and receipts water pipeline, coal gas drainer includes the ponding package, and ponding package top is upwards parallel to be provided with import pipe and water seal straight tube, and the import pipe top is connected the pipe in the water through the pipe in the water gate valve, and water seal straight tube top is connected water injection cone through the water injection valve and is fought, and the import of three-way pipe is connected to water seal straight tube lateral wall, and the upper exit and the lower export of three-way pipe are connected the inlet tube of overflow pipe and pump box respectively through the ball;
an outlet pipe of the pump box is connected with a water receiving pipeline, the pump box comprises an electric control part and a waterway part, and the electric control part acquires the water level value of the waterway part and compares the water level value with the water level value arranged in the waterway part; when the collected water level value is larger than the set water level value, the pump box is started, the water collecting pipeline receives high-pressure water discharged by the pump box, and the high-pressure water is collected and discharged to the centralized water pool; otherwise, the pump tank stops pumping.
The working principle is as follows: the downpipe is connected to the lower end face of the gas pipeline, and liquid water settled from the gas pipeline is guided into the gas drainer; in the work, when water needs to be supplied into the drainer, the safe operation method comprises the steps of closing the downpipe gate valve, opening the water injection valve and the exhaust valve, adding water from the water injection cone until the exhaust valve overflows, then closing the exhaust valve and the water injection valve, opening the downpipe gate valve, and putting the drainer into service; the liquid water collected by the coal gas drainer can be delivered to the water pump device in a fully-closed mode so as to meet the environmental protection requirement, the pump box is used for pressurizing coal gas water and then delivering the pressurized coal gas water to the centralized water pool through a pipeline, and the static pressure type liquid level measurement is adopted to automatically control the start and stop of the water pump so as to achieve the water seal of coal gas and the automatic discharge of the coal gas water. When the pump case normal work was often, the pond is concentrated to waste water can be sent to the closed, and when the pump case trouble, and remote monitoring end in time not noticed, unnecessary waste water accessible second grade water seal overflow pipe was temporarily arranged outward.
Furthermore, the inlet pipe extends to the bottom in the water collecting drum, the bottom end of the inlet pipe is an oblique cutting surface so as to reduce the blocking probability, and the outer wall of the inlet pipe is provided with exhaust holes close to the top end of the water collecting drum, and the exhaust holes are positioned in the water collecting drum; the bottom end of the water seal straight pipe is an oblique section so as to reduce the blocking probability, the bottom of the water seal straight pipe is sleeved in the filter cartridge, the bottom of the filter cartridge is sleeved in the fixing sleeve, the fixing sleeve is welded on the inner bottom surface of the water accumulation bag, and the water seal straight pipe, the filter cartridge and the fixing sleeve are arranged concentrically; a drain valve is arranged on one side of the outer wall of the water accumulation bag, a gas pressure gauge is arranged on the other side of the outer wall of the water accumulation bag, and a sewage disposal and maintenance blind plate is further arranged on the outer wall of the water accumulation bag.
Further, the water path part comprises an inlet pipe, a static pressure type water level sensor is arranged on the inlet pipe, the inlet pipe is connected with the inlet end of the acid and alkali resistant diaphragm pump through a one-way valve, the outlet end of the acid and alkali resistant diaphragm pump is connected with an outlet pipe, and the outlet pipe is provided with the one-way valve;
the electric control part comprises an intelligent water level instrument, the intelligent water level instrument is connected with a communication module, the communication module is connected with an indicator lamp and a button, one end of a time relay is connected with the intelligent water level instrument, the other end of the time relay is connected with an acid-base resistant diaphragm pump, one end of a contactor is connected with the intelligent water level instrument, and the other end of the contactor is connected with the acid-base resistant diaphragm pump; the intelligent water level instrument, the time relay, the contactor, the communication module, the indicator lamp and the button are all connected with the power switch group;
the electric control part and the water path part are separated by a partition plate so as to prevent damage to the electric element caused by water leakage due to breakage of the water pipe.
Furthermore, the water collecting pipeline comprises a water collecting branch pipe, the outlet pipe is connected to the water collecting branch pipe through a branch pipe inlet valve, a branch pipe blowdown valve is arranged at one end of the water collecting branch pipe, the other end of the water collecting branch pipe is connected to the side wall of the water collecting main pipe, one end of the water collecting main pipe is closed, and the other end of the water collecting main pipe is arranged above the concentrated water tank. When the water pump is stopped, the three-stage isolation effect can effectively prevent water stored in the water receiving pipeline from flowing back to the drainer, and the reliability and the economical efficiency of system operation are ensured.
The utility model has the advantages that: the utility model provides a gas drainer device for centralized recovery of wastewater, which has simple internal structure, no hidden danger caused by invisible internal corrosion perforation, and water seal grade which can be adjusted arbitrarily; the required sealing pressure can be set through the elevation change of the pipe orifice on the secondary water seal pipe, and the automatic overflow function is realized when wastewater is automatically and intensively recovered and the drainage is failed; the low water level of the water accumulation bag can still ensure the reliable sealing of the coal gas.
Drawings
The present invention will be further explained with reference to the drawings and examples.
Fig. 1 is a schematic structural diagram of the present invention;
FIG. 2 is a perspective view of a gas drainer;
FIG. 3 is a schematic diagram of the construction of the pump housing;
in the figure: 1-gas drainer, 10-downpipe gate valve, 11-water collecting bag, 12-downpipe, 13-water sealing straight pipe, 14-inlet pipe, 15-overflow pipe, 16-three-way pipe, 17-blowoff valve, 18-gas pressure gauge, 19-decontamination overhaul blind plate, 2-pump box, 21-inlet pipe, 22-one-way valve, 23-static pressure type water level sensor, 24-acid and alkali resistant diaphragm pump, 25-outlet pipe, 26-intelligent water level instrument, 27-communication module, 28-indicator light, 29-button, 3-water collecting pipeline, 31-water collecting main pipe, 32-water collecting branch pipe, 33-branch pipe inlet valve, 34-branch pipe blowoff valve, 35-filter cylinder, 36-fixed sleeve, 37-vent hole, 4-time relay, 5-contactor, 6-power switch group and 7-partition board.
Detailed Description
The present invention will now be described in further detail with reference to the accompanying drawings. These drawings are simplified schematic drawings and illustrate the basic structure of the present invention only in a schematic manner, and thus show only the components related to the present invention.
As shown in fig. 1-3, the utility model provides a gas drainer device for intensively recycling wastewater, which comprises a gas drainer 1, a pump box 2 and a water collecting pipeline 3, wherein the gas drainer 1 comprises a water accumulation bag 11, the water accumulation bag 11 is a cylindrical tank body with a height of 1 meter and a radius of a circular surface of 0.3 meter, and is made of stainless steel material to prevent corrosion and ensure working reliability and service life;
an inlet pipe 14 and a water seal straight pipe 13 are arranged at the top end of the water collecting bag 11 in parallel upwards, the top end of the inlet pipe 14 is connected with a downpipe 12 through a downpipe gate valve 10, and a connecting piece at the lower end port of the gate valve is the inlet pipe 14 of the gas drainer 1; in order to facilitate uniform manufacture of equipment, the pipe diameter of the inlet pipe 14 is DN125, and the inlet pipe is matched with the downpipe gate valve 10 with the same diameter;
the top end of the water seal straight pipe 13 is connected with a water injection conical hopper through a water injection valve, and in work, when water needs to be supplemented into the drainer, a safe operation method is to close the downpipe gate valve 10, open the water injection valve and the exhaust valve, add water from the water injection conical hopper until the exhaust valve overflows with water; then the exhaust valve and the water injection valve are closed, the downpipe gate valve 10 is opened, and the drainer is put into use;
the side wall of the water-sealed straight pipe 13 is connected with an inlet of a three-way pipe 16, an upper outlet and a lower outlet of the three-way pipe 16 are respectively connected with an overflow pipe 15 and an inlet pipe 21 of the pump box 2 through ball valves, the three-way pipe 16 serves as a secondary water seal and an automatic drainage interface, an upper pipe opening of the three-way pipe 16 is connected with an upper ball valve of the three-way pipe, the ball valve is connected with a secondary water-sealed overflow pipe 15, an upper pipe opening of the overflow pipe 15 is connected with an air filter, and the elevation of the air; a lower pipe opening of the three-way pipe 16 is connected with a lower ball valve, the ball valve is connected with a water filter, and the water filter is communicated to a pump box water inlet joint of the pump box 2 through a pipeline, so that liquid water collected by the gas drainer 1 can be delivered to a water pump device in a fully-closed mode to meet the requirement of environmental protection;
an outlet pipe 25 of the pump box 2 is connected with the water receiving pipeline 3, the pump box 2 comprises an electric control part and a waterway part, and the electric control part acquires the water level value of the waterway part and compares the water level value with the water level value arranged in the waterway part; when the collected water level value is larger than the set water level value, the pump box 2 is started, and the water collecting pipeline 3 receives high-pressure water discharged by the pump box 2 and then collects and discharges the high-pressure water to the centralized water pool; otherwise, the pump tank 2 stops pumping.
As shown in fig. 1 and fig. 2, the inlet pipe 14 extends to the bottom in the water accumulation bag 11, the total length of the inlet pipe 14 is 1.1 m, the depth of the inlet pipe is 0.9 m, and the lower end surface of the pipe is a chamfered surface so as to reduce the blocking probability; the exhaust hole 37 is arranged at the position of the pipe body, which is about 100mm downwards in the water collecting bag 11, so that the highest liquid level of the water collecting bag 11 is about 0.9 m, and the gas layer at the upper part can reduce the heat exchange with the outside in the subzero temperature environment; the pipe body is provided with an exhaust valve outside the water collecting bag 11 and used for an exhaust channel when water replenishing is needed to be added to the facility;
the total length of the water seal straight pipe 13 is 1.5 m, the depth of the water seal straight pipe is 0.9 m, and the lower end surface of the water seal straight pipe is a chamfer surface. Because of water seal straight tube 13 is as the drain pipe simultaneously, the intake is located long water drum 11 inner lower part, for preventing to gather and discharge filth, filter equipment is established to the intake periphery: a short tubular fixing sleeve 36 with the length of 150mm is welded on the inner bottom surface of the water accumulation bag 11, and the fixing sleeve 36 is concentric with the center of the water seal straight pipe 13. Then, a filter cartridge 35 is placed in the fixed sleeve 36, the length of the filter cartridge 35 is 0.5 m, and the filtration grade is selected according to the type of coal gas, so that the filter screen cannot be completely blocked in a certain period; a blowoff valve 17 is arranged on one side of the outer wall of the water accumulation bag 11, a coal gas pressure gauge 18 is arranged on the other side of the outer wall of the water accumulation bag 11, and a sewage disposal and maintenance blind plate 19 is also arranged on the outer wall of the water accumulation bag 11.
As shown in fig. 1 and 3, the waterway part comprises an inlet pipe 21, a static pressure type water level sensor 23 is arranged on the inlet pipe 21, the inlet pipe 21 is connected with an inlet end of an acid and alkali resistant diaphragm pump 24 through a one-way valve 22, an outlet end of the acid and alkali resistant diaphragm pump 24 is connected with an outlet pipe 25, and the outlet pipe 25 is provided with a one-way valve;
the electric control part comprises an intelligent water level instrument 26, the intelligent water level instrument 26 is connected with a communication module 27, the communication module 27 is connected with an indicator lamp 28 and a button 29, one end of a time relay 4 is connected with the intelligent water level instrument 26, the other end of the time relay is connected with an acid and alkali resistant diaphragm pump 24, one end of a contactor 5 is connected with the intelligent water level instrument 26, and the other end of the contactor 5 is connected with the acid and alkali resistant diaphragm pump 24; the intelligent water level meter 26, the time relay 4, the contactor 5, the communication module 27, the indicator light 28 and the button 29 are all connected with the power switch group 6; the intelligent water level meter 26 collects signals of the static pressure type water level sensor 23 arranged on the water path, compares the signals with an internal water level value and outputs a pump starting and stopping instruction; the time relay 4 is used for enabling the single running time of the water pump not to be lower than a set value; the contactor 5 is used for receiving a pump starting signal to control the water pump to run in an electrified mode, and specifically, the contactor 5 can be replaced by a power relay; the communication module 27 is used for acquiring a liquid level signal sent by the intelligent water level instrument 26 and transmitting the liquid level signal to a remote centralized monitoring end so as to reduce the number of manual field inspection; when the water pump is powered on to operate, the indicator light 28 is lightened; after the button 29 is clicked, the water pump runs for a period of time according to the time set by the time relay 4, and meanwhile, under the normal working condition, the button 29 is clicked manually on site, the water pump runs, and the indication value of the intelligent water level instrument 26 can be observed to be obviously reduced, so that the water drainage pipeline is proved to be normal;
the electric control part and the water path part are isolated by the clapboard 7, so that the damage to the electric elements caused by the damage and water leakage of the water pipe is prevented.
As shown in fig. 1, the water collecting pipeline 3 includes a water collecting branch pipe 32, the outlet pipe 25 is connected to the water collecting branch pipe 32 through a branch inlet valve 33, one end of the water collecting branch pipe 32 is provided with a branch blowdown valve 34, the other end of the water collecting branch pipe is connected to the side wall of the water collecting main pipe 31, one end of the water collecting main pipe 31 is closed, and the other end of the water collecting main pipe 31 is arranged above the water collecting pool. When the water pump is stopped, the three-stage isolation effect can effectively prevent accumulated water in the water receiving pipeline 3 from flowing back to the drainer, and the reliability and the economical efficiency of system operation are ensured.
The utility model provides a gas drainer device for centralized recovery of wastewater, which has simple internal structure, no hidden danger caused by invisible internal corrosion perforation, and water seal grade which can be adjusted arbitrarily; the required sealing pressure can be set through the elevation change of the pipe orifice on the secondary water seal pipe, and the automatic overflow function is realized when wastewater is automatically and intensively recovered and the drainage is failed; the low water level of the water accumulation bag can still ensure the reliable sealing of the coal gas.
In light of the foregoing, it will be apparent to those skilled in the art from this disclosure that various changes and modifications can be made without departing from the spirit and scope of the invention. The technical scope of the present invention is not limited to the content of the specification, and must be determined according to the scope of the claims.
Claims (4)
1. The utility model provides a coal gas drainer device for concentrating recovery waste water which characterized in that: the coal gas drainage device comprises a coal gas drainage device (1), a pump box (2) and a water collecting pipeline (3), wherein the coal gas drainage device (1) comprises a water accumulation bag (11), an inlet pipe (14) and a water seal straight pipe (13) are arranged at the top end of the water accumulation bag (11) in an upward parallel mode, the top end of the inlet pipe (14) is connected with a water falling pipe (12) through a water falling pipe gate valve (10), the top end of the water seal straight pipe (13) is connected with a water injection conical hopper through a water injection valve, the side wall of the water seal straight pipe (13) is connected with an inlet of a three-way pipe (16), and an upper outlet and a lower outlet of the three-way pipe (16) are respectively connected with an overflow;
an outlet pipe (25) of the pump box (2) is connected with the water receiving pipeline (3), the pump box (2) comprises an electric control part and a water path part, and the electric control part acquires the water level value of the water path part and compares the water level value with the water level value arranged in the electric control part; when the collected water level value is larger than the set water level value, the pump box (2) is started, and the water receiving pipeline (3) receives high-pressure water discharged by the pump box (2) and then collects and discharges the high-pressure water to the centralized water pool; otherwise, the pump tank (2) stops pumping.
2. The gas drainer device for concentrated recycling of wastewater as claimed in claim 1, wherein: the inlet pipe (14) extends to the inner bottom of the water collecting drum (11), the bottom end of the inlet pipe (14) is a chamfered surface, the outer wall of the inlet pipe (14) is provided with an exhaust hole (37) close to the top end of the water collecting drum (11), and the exhaust hole (37) is positioned in the water collecting drum (11); the bottom end of the water seal straight pipe (13) is a bevel section, the bottom of the water seal straight pipe (13) is sleeved in the filter cylinder (35), the bottom of the filter cylinder (35) is sleeved in the fixing sleeve (36), the fixing sleeve (36) is welded on the inner bottom surface of the water accumulation drum (11), and the water seal straight pipe (13), the filter cylinder (35) and the fixing sleeve (36) are arranged concentrically; a drain valve (17) is arranged on one side of the outer wall of the water accumulation bag (11), a coal gas pressure gauge (18) is arranged on the other side of the outer wall of the water accumulation bag (11), and a sewage cleaning and overhauling blind plate (19) is further arranged on the outer wall of the water accumulation bag (11).
3. The gas drainer device for concentrated recycling of wastewater as claimed in claim 1, wherein: the water path part comprises an inlet pipe (21), a static pressure type water level sensor (23) is arranged on the inlet pipe (21), the inlet pipe (21) is connected with an inlet end of an acid and alkali resistant diaphragm pump (24) through a one-way valve (22), an outlet end of the acid and alkali resistant diaphragm pump (24) is connected with an outlet pipe (25), and the outlet pipe (25) is provided with the one-way valve;
the electric control part comprises an intelligent water level instrument (26), the intelligent water level instrument (26) is connected with a communication module (27), the communication module (27) is connected with an indicator lamp (28) and a button (29), one end of a time relay (4) is connected with the intelligent water level instrument (26), the other end of the time relay is connected with the acid-base resistant diaphragm pump (24), one end of a contactor (5) is connected with the intelligent water level instrument (26), and the other end of the contactor (5) is connected with the acid-base resistant diaphragm pump (24); the intelligent water level meter (26), the time relay (4), the contactor (5), the communication module (27), the indicator lamp (28) and the button (29) are all connected with the power switch group (6);
the electric control part and the water path part are separated by a partition plate (7).
4. The gas drainer device for concentrated recycling of wastewater as claimed in claim 1, wherein: receive water pipeline (3) including receiving water branch pipe (32), outlet pipe (25) are connected to through branch pipe inlet valve (33) receive on water branch pipe (32), receive water branch pipe (32) one end and be provided with branch pipe blowoff valve (34), its other end is connected to on the lateral wall of receiving water house steward (31), receive water house steward (31) one end and seal, it sets up to receive water house steward (31) other end concentrate the pond top.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022055939.1U CN213299629U (en) | 2020-09-18 | 2020-09-18 | A coal gas drainer device for concentrating retrieve waste water |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022055939.1U CN213299629U (en) | 2020-09-18 | 2020-09-18 | A coal gas drainer device for concentrating retrieve waste water |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN213299629U true CN213299629U (en) | 2021-05-28 |
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ID=76032527
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202022055939.1U Active CN213299629U (en) | 2020-09-18 | 2020-09-18 | A coal gas drainer device for concentrating retrieve waste water |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN213299629U (en) |
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2020
- 2020-09-18 CN CN202022055939.1U patent/CN213299629U/en active Active
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