CN210426213U - Mine return air heat utilization device - Google Patents
Mine return air heat utilization device Download PDFInfo
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- CN210426213U CN210426213U CN201921381060.7U CN201921381060U CN210426213U CN 210426213 U CN210426213 U CN 210426213U CN 201921381060 U CN201921381060 U CN 201921381060U CN 210426213 U CN210426213 U CN 210426213U
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Abstract
The utility model belongs to the energy field, in particular to a mine return air heat utilization device, aiming at the problems that the prior mode of heating air adopts a coal-fired boiler or an electric boiler to generate hot air, the cost is higher, and a certain amount of resources can be wasted, the utility model provides a proposal that the device comprises a heat exchanger evaporation section case and a working medium condensation section case, the heat exchanger evaporation section case is provided with a working medium groove evaporation section lower groove, a return air inlet, a working medium groove evaporation section upper groove and a return air outlet, and the working medium groove evaporation section lower groove and the working medium groove evaporation section upper groove are provided with a same first finned tube, the working medium condensation section upper groove, the working medium condensation section lower groove, a fresh air inlet and a fresh air outlet are respectively arranged on the working medium condensation section case, the utility model utilizes the heat in the return air to heat cold air, and adopts the heat exchanger evaporation section case to replace the traditional coal-fired boiler or the electric boiler, the energy consumption can be effectively reduced, a large amount of resources are saved, and the use cost is effectively reduced.
Description
Technical Field
The utility model relates to an energy technical field especially relates to a mine return air heat utilization equipment.
Background
Mine ventilation, which is the introduction of fresh air into a mine to increase the concentration of oxygen and remove harmful gases from the mine, is the basic task of: enough fresh air is supplied, the requirement of workers on oxygen is met, underground harmful gas and dust are diluted, and life safety is guaranteed;
the underground climate is adjusted, a good working environment is created, the underground air flow reaches an air outlet after flowing according to a designed route through the equipment for guiding the air flow and blocking the air flow, the air is circularly filtered to become return air and is exhausted from a mine air outlet, the air is heated and then conveyed to the underground in winter, the existing mode of heating the air is that a coal-fired boiler or an electric boiler is adopted to generate hot air, the cost is high, and a certain amount of resources can be wasted, so that the mine return air heat utilization device is provided and used for solving the problems.
SUMMERY OF THE UTILITY MODEL
The utility model aims at solving the mode that exists among the prior art and heat the air, adopt coal-fired boiler or electric boiler to produce steam, the cost is higher, and can waste the shortcoming of a certain amount of resources, and the mine return air heat utilization device who provides.
In order to achieve the above purpose, the utility model adopts the following technical scheme:
a mine return air heat utilization device comprises a heat exchanger evaporation section case and a working medium condensation section case, wherein a working medium groove evaporation section lower groove, a return air inlet, a working medium groove evaporation section upper groove and a return air outlet are arranged on the heat exchanger evaporation section case, the same first finned tube is arranged on the working medium groove evaporation section lower groove and the working medium groove evaporation section upper groove, a working medium condensation section upper groove, a fresh air inlet and a fresh air outlet are respectively arranged on the working medium condensation section case, the same second finned tube is clamped on the working medium condensation section upper groove and the working medium condensation section lower groove, a working medium evaporation outlet is arranged on the top inner wall of the working medium groove evaporation section upper groove, a working medium evaporation opening is fixedly connected in a sealing manner in the working medium evaporation opening, a working medium condensation section inlet is arranged on the top inner wall of the working medium condensation section upper groove, one end of the working medium evaporation pipe extends into the working medium condensation section inlet and is fixedly connected with the inner wall of the working medium condensation section inlet, the bottom inner wall of the working medium groove evaporation section lower groove is provided with a working medium groove lower groove inlet, a connecting pipe is fixedly connected in the working medium groove lower groove inlet, one end of the connecting pipe extends to the outer side of the heat exchanger evaporation section case and is fixedly connected with a power box in a sealing mode, a working medium liquefaction circulating pipe is fixedly mounted on the power box in a sealing mode, a working medium condensation section lower groove outlet is formed in the bottom inner wall of the working medium condensation section lower groove, and one end of the working medium liquefaction circulating pipe extends into the working medium condensation section lower groove outlet and is fixedly connected with the inner wall of the working medium condensation section lower groove outlet in a sealing mode.
Preferably, be equipped with the pressure ball in the headstock, and the one end that connecting pipe and working medium liquefaction runner pipe are close to each other all extend to the pressure ball and respectively with the pressure ball in and sealed fixed connection, fixed mounting has the erection column on the inner wall of headstock, and symmetrical sliding connection has two clamp plates on the erection column, two clamp plates are located the top and the below of pressure ball respectively and all contact with the pressure ball, utilize two clamp plates can conveniently extrude the pressure ball to this increases power.
Preferably, a driving motor is fixedly mounted on the inner wall of the bottom of one side of the power box, an output shaft of the driving motor is fixedly connected with an L-shaped rod, a connecting ring is fixedly mounted on one side of the bottom of the pressing plate located below, one end of the L-shaped rod extends into the connecting ring and is movably connected with the inner wall of the connecting ring, and the driving motor can apply power to the pressing plate so that the pressing plate can move.
Preferably, the rack is fixedly mounted on one side, close to each other, of each of the two pressing plates, the gear is rotatably connected to one side of the mounting column, the two racks are meshed with the gear, and the racks and the gear are used for transmission, so that the two pressing plates can be simultaneously close to each other or far away from each other.
Preferably, the equal sealed fixed mounting has a check pipe in the working medium liquefaction circulation pipe and the connecting pipe, and the intraductal fixed mounting of check has a spliced pole, and sliding connection has the pull rod on the spliced pole, and the one end fixed mounting of pull rod has the ball template, the inner wall movable seal laminating of ball template and check pipe, the cover is equipped with spacing spring on the pull rod, and spacing spring is located one side of spliced pole, spacing spring's both ends respectively with spliced pole and pull rod fixed connection, it is spacing to utilize spacing spring can carry out elasticity to the ball template, prevent that the ball template from removing at will.
The utility model discloses in, mine return air thermal utilization device
The first finned tube and the second finned tube can improve the heat exchange area and effectively change the heat exchange coefficient;
the first finned tube and the second finned tube are adopted to select special working media to ensure heat exchange at the working condition temperature, such as: the return air temperature is 15 ℃ and the fresh air temperature is-20 ℃, fresh air with the temperature of 2 ℃ can be obtained after heat exchange, and the return air is discharged at the temperature of 2 ℃;
when the position of the working medium condensing section case is higher than that of the heat exchanger evaporating section case, the condensed working medium flows back to the heat exchanger evaporating section case under the action of gravity and a power box;
when the position of the working medium condensing section case is lower than that of the heat exchanger evaporating section case, the condensed working medium is returned to the heat exchanger evaporating section case under the action of the power box;
the utility model discloses an utilize the heat heating cold air in the return air, adopt heat exchanger evaporation zone machine case to replace traditional coal fired boiler or electric boiler, can effectual reduction energy loss, practice thrift a large amount of resources, effectual reduction use cost.
Drawings
Fig. 1 is a front view of a mine return air heat utilization device according to the present invention;
fig. 2 is a front view of the internal structure of the power box of the mine return air heat utilization device provided by the utility model;
fig. 3 is a side view of the internal structure of the power box of the mine return air heat utilization device provided by the utility model;
fig. 4 is a front view of the internal structure of the pressure ball of the mine return air heat utilization device provided by the utility model;
fig. 5 is a front view of the inner structure of the one-way pipe of the mine return air heat utilization device of the present invention.
In the figure: 1 working medium groove lower groove inlet, 2 heat exchanger evaporation section machine case, 3 working medium groove evaporation section lower groove, 4 first finned tube heat pipes, 5 return air inlet, 6 working medium groove evaporation section upper groove, 7 working medium evaporation outlet, 8 working medium vaporization circulation pipe, 9 working medium condensation section inlet, 10 working medium condensation section machine case, 11 working medium condensation section upper groove, 12 second finned tube heat pipes, 13 fresh air outlet, 14 working medium condensation section lower groove, 15 working medium condensation section lower groove outlet, 16 working medium liquefaction circulation pipe, 17 fresh air inlet, 18 return air outlet, 19 power box, 20 mounting column, 21 pressing plate, 22 pressure ball, 23 gear, 24 rack, 25 driving motor, 26L-shaped rod, 27 one-way pipe, 28 ball-shaped plate, 29 pull rod and 30 limiting spring.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments.
Example one
Referring to fig. 1-5, a mine return air heat utilization device comprises a heat exchanger evaporation section case 2 and a working medium condensation section case 10, wherein the heat exchanger evaporation section case 2 is provided with a working medium groove evaporation section lower groove 3, a return air inlet 5, a working medium groove evaporation section upper groove 6 and a return air outlet 18, the working medium groove evaporation section lower groove 3 and the working medium groove evaporation section upper groove 6 are provided with the same first finned tube 4, the working medium condensation section case 10 is respectively provided with a working medium condensation section upper groove 11, a working medium condensation section lower groove 14, a fresh air inlet 17 and a fresh air outlet 13, the working medium condensation section upper groove 11 and the working medium condensation section lower groove 14 are respectively provided with the same second finned tube 12, the inner wall of the top of the working medium groove evaporation section upper groove 6 is provided with a working medium evaporation outlet 7, the working medium evaporation outlet 7 is fixedly connected with a working medium vaporization runner 8 in a sealing manner, the working medium condensation section upper groove 11 is provided with a, one end of the working medium vaporization circulating pipe 8 extends into the working medium condensation section inlet 9 and is fixedly connected with the inner wall sealing of the working medium condensation section inlet 9, a working medium groove inlet 1 is formed in the inner wall of the bottom of the working medium groove evaporation section lower groove 3, a connecting pipe is fixedly connected in the working medium groove inlet 1, one end of the connecting pipe extends to the outer side of the heat exchanger evaporation section case 2 and is fixedly connected with a power box 19 in a sealing mode, a working medium liquefaction circulating pipe 16 is fixedly mounted on the power box 19 in a sealing mode, a working medium condensation section lower groove outlet 15 is formed in the inner wall of the bottom of the working medium condensation section lower groove 14, and one end of the working medium liquefaction circulating pipe 16 extends into the working medium condensation section lower groove outlet 15 and is fixedly connected with the inner wall sealing of the working medium condensation.
The utility model discloses in, be equipped with pressure ball 22 in the headstock 19, and the connecting pipe and the one end that working medium liquefaction runner pipe 16 is close to each other all extend to pressure ball 22 and respectively with pressure ball 22 in and sealed fixed connection, fixed mounting has erection column 20 on the inner wall of headstock 19, and symmetrical sliding connection has two clamp plates 21 on the erection column 20, two clamp plates 21 are located pressure ball 22's top and below respectively and all contact with pressure ball 22, utilize two clamp plates 21 can conveniently extrude pressure ball 22, with this increase power.
The utility model discloses in, fixed mounting has driving motor 25 on one side bottom inner wall of headstock 19, and fixedly connected with L type pole 26 on driving motor 25's the output shaft, and the bottom one side fixed mounting of clamp plate 21 that is located the below has the go-between, and L type pole 26's one end extends to in the go-between and with the inner wall swing joint of go-between, utilizes driving motor 25 can apply power to clamp plate 21, just can clamp plate 21 move.
The utility model discloses in, the equal fixed mounting in one side that two clamp plates 21 are close to each other has rack 24, and one side of erection column 20 is rotated and is connected with gear 23, and two rack 24 all mesh with gear 23 mutually, utilize rack 24 and gear 23 to carry out the transmission to this can realize that two clamp plates 21 are close to each other simultaneously or keep away from each other.
The utility model discloses in, equal sealed fixed mounting has one-way pipe 27 in working medium liquefaction flow tube 16 and the connecting pipe, and fixed mounting has the spliced pole in the one-way pipe 27, sliding connection has pull rod 29 on the spliced pole, and pull rod 29's one end fixed mounting has ball type plate 28, the inner wall movable seal laminating of ball type plate 28 and one-way pipe 27, the cover is equipped with spacing spring 30 on the pull rod 29, and spacing spring 30 is located one side of spliced pole, spacing spring 30's both ends respectively with spliced pole and pull rod 29 fixed connection, it is spacing to utilize spacing spring 30 to carry out elasticity to ball type plate 28, prevent that ball type plate 28 from removing at will.
Example two
Referring to fig. 1-5, a mine return air heat utilization device comprises a heat exchanger evaporation section case 2 and a working medium condensation section case 10, wherein the heat exchanger evaporation section case 2 is provided with a working medium groove evaporation section lower groove 3, a return air inlet 5, a working medium groove evaporation section upper groove 6 and a return air outlet 18, the working medium groove evaporation section lower groove 3 and the working medium groove evaporation section upper groove 6 are provided with the same first finned tube 4, the working medium condensation section case 10 is respectively provided with a working medium condensation section upper groove 11, a working medium condensation section lower groove 14, a fresh air inlet 17 and a fresh air outlet 13, the working medium condensation section upper groove 11 and the working medium condensation section lower groove 14 are respectively provided with the same second finned tube 12, the inner wall of the top of the working medium groove evaporation section upper groove 6 is provided with a working medium evaporation outlet 7, a working medium vaporization circulation pipe 8 is hermetically welded in the working medium evaporation outlet 7, the working medium condensation section upper groove 11 is provided with a working medium condensation, one end of a working medium vaporization circulating pipe 8 extends into the working medium condensation section inlet 9 and is welded with the inner wall of the working medium condensation section inlet 9 in a sealing way, the inner wall of the bottom of a working medium groove evaporation section lower groove 3 is provided with a working medium groove lower groove inlet 1, a connecting pipe is welded in the working medium groove lower groove inlet 1, one end of the connecting pipe extends to the outer side of a heat exchanger evaporation section case 2 and is welded with a power box 19 in a sealing way, a working medium liquefaction circulating pipe 16 is welded on the power box 19 in a sealing way, a working medium condensation section lower groove outlet 15 is arranged on the inner wall of the bottom of a working medium condensation section lower groove 14, one end of the working medium liquefaction circulating pipe 16 extends into the working medium condensation section lower groove outlet 15 and is welded with the inner wall of the working medium condensation section lower groove outlet 15 in a sealing way, the heat exchange area can be increased by adopting a first finned pipe 4 and a second finned pipe 12, the heat exchange coefficient can be effectively changed, and, such as: the return air temperature is 15 degrees centigrade and fresh air temperature-20 degrees centigrade, can obtain the new trend of 2 degrees centigrade after the heat transfer, is 2 degrees centigrade when the return air is discharged, when working medium condensation segment machine case 10 position is higher than heat exchanger evaporation segment machine case 2 position, rely on gravity and headstock 19's effect, the working medium after the condensation flows back to heat exchanger evaporation segment machine case 2, when working medium condensation segment machine case 10 position is less than heat exchanger evaporation segment machine case 2 position, rely on under headstock 19's the effect, the working medium after with the condensation sends back heat exchanger evaporation segment machine case 2, the utility model discloses an utilize the heat in the return air to heat the cold air, adopt heat exchanger evaporation segment machine case 2 to replace traditional coal fired boiler or electric boiler, can effectual reduction energy loss, practice thrift a large amount of resources, effectual reduction use cost.
The utility model discloses in, be equipped with pressure ball 22 in the headstock 19, and the connecting pipe and the one end that working medium liquefaction runner pipe 16 is close to each other all extend to pressure ball 22 and respectively with pressure ball 22 in and seal weld, the welding has erection column 20 on the inner wall of headstock 19, and symmetrical sliding connection has two clamp plates 21 on the erection column 20, two clamp plates 21 are located pressure ball 22's top and below respectively and all contact with pressure ball 22, utilize two clamp plates 21 can conveniently extrude pressure ball 22, with this increase power.
The utility model discloses in, there is driving motor 25 through bolt fixed mounting on one side bottom inner wall of headstock 19, and the welding has L type pole 26 on driving motor 25's the output shaft, and the bottom one side welding of clamp plate 21 that is located the below has the go-between, and L type pole 26's one end extends to in the go-between and with the inner wall swing joint of go-between, utilizes driving motor 25 to exert power to clamp plate 21, just can clamp plate 21 move.
The utility model discloses in, rack 24 has all been welded to one side that two clamp plates 21 are close to each other, and one side of erection column 20 is rotated and is connected with gear 23, and two rack 24 all mesh with gear 23 mutually, utilize rack 24 and gear 23 to carry out the transmission to this can realize that two clamp plates 21 are close to each other simultaneously or keep away from each other.
The utility model discloses in, equal seal welding has one-way pipe 27 in working medium liquefaction flow tube 16 and the connecting pipe, and the welding has the spliced pole in the one-way pipe 27, sliding connection has pull rod 29 on the spliced pole, and the one end welding of pull rod 29 has ball template 28, the inner wall movable seal laminating of ball template 28 and one-way pipe 27, the cover is equipped with spacing spring 30 on the pull rod 29, and spacing spring 30 is located one side of spliced pole, spacing spring 30's both ends weld with spliced pole and pull rod 29 respectively mutually, it is spacing to utilize spacing spring 30 to carry out elasticity to ball template 28, prevent that ball template 28 from removing at will.
The utility model discloses in, driving motor 25's among this technical scheme power supply mode adopts external 220V alternating voltage to this has certain convenience when using, adopts first finned tube heat pipe 4 and second finned tube heat pipe 12 can improve heat transfer area, and effectual change heat transfer coefficient adopts first finned tube heat pipe 4 and second finned tube heat pipe 12 to choose for use special working medium to guarantee the heat transfer under operating mode temperature, if: the return air temperature is 15 ℃ and the fresh air temperature is-20 ℃, fresh air with the temperature of 2 ℃ can be obtained after heat exchange, the return air is 2 ℃ when being discharged, when the position of a working medium condensing section case 10 is higher than the position of a heat exchanger evaporation section case 2, the condensed working medium flows back to the heat exchanger evaporation section case 2 under the action of gravity and a power box 19, when the position of the working medium condensing section case 10 is lower than the position of the heat exchanger evaporation section case 2, the condensed working medium is fed back to the heat exchanger evaporation section case 2 under the action of the power box 19, so that cold air can be heated by utilizing the heat in the return air, the heat exchanger evaporation section case 2 is adopted to replace a traditional coal-fired boiler or an electric boiler, the energy consumption can be effectively reduced, a large number of resources are saved, and the use cost is effectively reduced;
when the power box 19 is used for increasing the power for delivering the working medium, the driving motor 25 is firstly started to drive the L-shaped rod 26 to rotate, at this time, under the action of the connecting ring, the pressing plate 21 located below can be driven to move upwards, so that the rack 24 located below can be driven to do longitudinal reciprocating motion, at this time, under the action of the gear 23, the rack 24 located above can also do longitudinal reciprocating motion, and the two racks 24 are in a motion trend of being simultaneously close to each other or being away from each other, so that the two pressing plates 21 can be simultaneously close to each other or being away from each other, when the two pressing plates 21 are close to each other, the pressure ball 22 can be extruded, because the working medium can be stored in the pressure ball 22, and under the action of the two ball-shaped plates 28, the one-way pipe 27 located on the connecting pipe can be in a communicating state, and the one-way pipe 27 on, the working medium in the pressure ball 22 can be discharged from the connecting pipe, when the pressure ball 22 recovers, a negative pressure state can be formed in the pressure ball 22, at the moment, the spherical plate 28 in the working medium liquefaction circulation pipe 16 can move under the negative pressure, so that the one-way pipe 27 can be in an open state, the working medium flowing into the working medium liquefaction circulation pipe 16 can be sucked into the pressure ball 22, and the stable flowing of the working medium can be ensured through repeated operation.
The above, only be the concrete implementation of the preferred embodiment of the present invention, but the protection scope of the present invention is not limited thereto, and any person skilled in the art is in the technical scope of the present invention, according to the technical solution of the present invention and the utility model, the concept of which is equivalent to replace or change, should be covered within the protection scope of the present invention.
Claims (5)
1. A mine return air heat utilization device comprises a heat exchanger evaporation section case (2) and a working medium condensation section case (10), wherein a working medium groove evaporation section lower groove (3), a return air inlet (5), a working medium groove evaporation section upper groove (6) and a return air outlet (18) are arranged on the heat exchanger evaporation section case (2), the same first finned tube heat pipe (4) is arranged on the working medium groove evaporation section lower groove (3) and the working medium groove evaporation section upper groove (6), the working medium condensation section upper groove (11), the working medium condensation section lower groove (14), a fresh air inlet (17) and a fresh air outlet (13) are respectively arranged on the working medium condensation section case (10), the same second finned tube heat pipe (12) is clamped on the working medium condensation section upper groove (11) and the working medium condensation section lower groove (14), and the mine return air heat utilization device is characterized in that the working medium evaporation section upper groove (6) is provided with a working medium evaporation outlet (7) on the inner wall, the working medium evaporation outlet (7) is internally and fixedly connected with a working medium vaporization runner pipe (8) in a sealing manner, the inner wall of the top of the working medium condensation section upper groove (11) is provided with a working medium condensation section inlet (9), one end of the working medium vaporization runner pipe (8) extends into the working medium condensation section inlet (9) and is fixedly connected with the inner wall of the working medium condensation section inlet (9) in a sealing manner, the inner wall of the bottom of the working medium evaporation section lower groove (3) is provided with a working medium groove lower groove inlet (1), the working medium groove lower groove inlet (1) is internally and fixedly connected with a connecting pipe, one end of the connecting pipe extends to the outer side of the heat exchanger evaporation section case (2) and is fixedly connected with a power box (19) in a sealing manner, a working medium liquefaction runner pipe (16) is fixedly installed on the power box (19) in a sealing manner, and a working medium condensation section lower groove outlet, one end of the working medium liquefaction circulation pipe (16) extends into the working medium condensation section lower groove outlet (15) and is fixedly connected with the inner wall of the working medium condensation section lower groove outlet (15) in a sealing mode.
2. The mine return air heat utilization device according to claim 1, wherein a pressure ball (22) is arranged in the power box (19), one ends, close to each other, of the connecting pipe and the working medium liquefaction circulating pipe (16) extend to the pressure ball (22) and are fixedly connected with the pressure ball (22) in a sealing mode respectively, a mounting column (20) is fixedly mounted on the inner wall of the power box (19), two pressing plates (21) are symmetrically connected to the mounting column (20) in a sliding mode, and the two pressing plates (21) are located above and below the pressure ball (22) respectively and are in contact with the pressure ball (22).
3. The mine return air heat utilization device is characterized in that a driving motor (25) is fixedly mounted on the inner wall of the bottom of one side of the power box (19), an L-shaped rod (26) is fixedly connected to an output shaft of the driving motor (25), a connecting ring is fixedly mounted on one side of the bottom of the pressing plate (21) located below, and one end of the L-shaped rod (26) extends into the connecting ring and is movably connected with the inner wall of the connecting ring.
4. A mine return air heat utilization device as claimed in claim 2, wherein one side of each of the two pressing plates (21) close to each other is fixedly provided with a rack (24), one side of the mounting column (20) is rotatably connected with a gear (23), and the two racks (24) are meshed with the gear (23).
5. The mine return air heat utilization device according to claim 1, wherein a one-way pipe (27) is fixedly installed in the working medium liquefaction circulation pipe (16) and the connecting pipe in a sealing mode, a connecting column is fixedly installed in the one-way pipe (27), a pull rod (29) is connected to the connecting column in a sliding mode, a ball-shaped plate (28) is fixedly installed at one end of the pull rod (29), the ball-shaped plate (28) is movably and hermetically attached to the inner wall of the one-way pipe (27), a limiting spring (30) is sleeved on the pull rod (29), the limiting spring (30) is located on one side of the connecting column, and two ends of the limiting spring (30) are fixedly connected with the connecting column and the pull rod (29) respectively.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921381060.7U CN210426213U (en) | 2019-08-23 | 2019-08-23 | Mine return air heat utilization device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921381060.7U CN210426213U (en) | 2019-08-23 | 2019-08-23 | Mine return air heat utilization device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN210426213U true CN210426213U (en) | 2020-04-28 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201921381060.7U Active CN210426213U (en) | 2019-08-23 | 2019-08-23 | Mine return air heat utilization device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN210426213U (en) |
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2019
- 2019-08-23 CN CN201921381060.7U patent/CN210426213U/en active Active
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