CN220850198U - Hydraulic control valve group based on electromagnetic cartridge valve - Google Patents
Hydraulic control valve group based on electromagnetic cartridge valve Download PDFInfo
- Publication number
- CN220850198U CN220850198U CN202322538667.4U CN202322538667U CN220850198U CN 220850198 U CN220850198 U CN 220850198U CN 202322538667 U CN202322538667 U CN 202322538667U CN 220850198 U CN220850198 U CN 220850198U
- Authority
- CN
- China
- Prior art keywords
- cover
- filter
- filter plate
- hydraulic control
- inlet pipe
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
- 238000007789 sealing Methods 0.000 claims abstract description 53
- 238000001914 filtration Methods 0.000 claims abstract description 14
- 229920000742 Cotton Polymers 0.000 claims description 19
- 238000009413 insulation Methods 0.000 claims description 17
- 238000009434 installation Methods 0.000 claims description 6
- 239000003292 glue Substances 0.000 claims description 3
- 239000007788 liquid Substances 0.000 abstract description 26
- 239000012535 impurity Substances 0.000 abstract description 16
- 238000010276 construction Methods 0.000 description 3
- 238000001125 extrusion Methods 0.000 description 3
- 238000004140 cleaning Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000002035 prolonged effect Effects 0.000 description 2
- 230000004075 alteration Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 230000007123 defense Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000003780 insertion Methods 0.000 description 1
- 230000037431 insertion Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Landscapes
- Lubrication Details And Ventilation Of Internal Combustion Engines (AREA)
Abstract
The utility model relates to the technical field of hydraulic control valves, and discloses a hydraulic control valve group based on an electromagnetic cartridge valve. The hydraulic control valve group based on the electromagnetic cartridge valve comprises a valve body, wherein the right side of the valve body is connected with an oil inlet pipe, a filtering structure is arranged on the oil inlet pipe, and a flange is fixed at the end part of the oil inlet pipe. According to the utility model, the filter cover, the first filter plate and the spiral blade fan are arranged, the filter cover is fixed with the oil inlet pipe, then the sealing plug is fixed with the filter cover through the first positioning plate and the first bolt, when liquid enters the oil inlet pipe, the liquid passes through the first filter plate and the second filter plate with different apertures respectively, so that impurities are intercepted in the filter cover, and simultaneously, the two spiral blade fans are pushed to rotate on the first filter plate and the second filter plate through the bearings when the liquid flows, so that the first filter plate and the second filter plate are cleaned when the liquid rotates, the impurity blockage is prevented, and the liquid is facilitated to be smooth.
Description
Technical Field
The utility model relates to the technical field of hydraulic control valves, in particular to a hydraulic control valve group based on an electromagnetic cartridge valve.
Background
The hydraulic control valve group is a hydraulic transmission system or an element used for controlling the pressure, the flow and the direction of the liquid in the hydraulic control system, wherein the pressure control valve is used for controlling the pressure, the flow control valve is used for controlling the flow, the flow control valve is used for controlling the on-off state and the flow direction, the direction control valve is used for controlling the on-off state and the flow direction of the liquid in the hydraulic system, the hydraulic control valve group is used for controlling and adjusting the flow direction, the pressure and the flow of the liquid in the hydraulic system, so that an actuator and a driving working mechanism thereof can obtain the required movement direction, the thrust (torque), the movement speed (rotating speed) and the like, and the hydraulic system is increasingly widely applied along with the development of national defense construction, traffic transportation construction, energy industry construction and the like, and cannot lack any hydraulic control valve group no matter how simple.
The patent document with the prior art publication number of CN211039200U provides an electromagnetic type cartridge hydraulic control valve convenient to install, the electromagnetic type cartridge hydraulic control valve convenient to install is designed on the basis of the existing hydraulic control valve, the fixing device capable of being connected more conveniently is added, the connection work of fixed installation can be carried out more conveniently, the fixed installation work is convenient, the workload of operators is reduced, the application range of products is enlarged, but when the patent with the publication number of CN211039200U is used, liquid transported by the hydraulic valve always contains some impurities, if the impurities are not treated in time, after the impurities enter the valve body, because parts in the valve body are more, the impurities are easy to gather and block in the valve body, the use of the valve body is affected, and therefore, the hydraulic control valve based on the electromagnetic type cartridge valve is needed.
Disclosure of utility model
The utility model aims to provide a hydraulic control valve bank based on an electromagnetic cartridge valve, which aims to solve the problems that when the liquid transported by the hydraulic valve in the background technology is not treated in time, impurities are easy to accumulate and block in the valve body due to more parts in the valve body after entering the valve body, the use of the valve body is affected, different valve bodies are connected through connecting pipes and flanges, but sealing rings on the inner side of the flanges are easy to age and fall off after being contacted with air for a long time, and the tightness of the flanges is affected.
In order to solve the technical problems, the utility model provides the following technical scheme: the utility model provides a hydraulic control valves based on electromagnetic cartridge valve, includes the valve body, the right side of valve body is connected with the oil feed pipe, be provided with filtration on the oil feed pipe, and the tip of oil feed pipe is fixed with the flange, be provided with seal structure on the flange.
The filter structure comprises a filter cover, a first filter plate is arranged on the inner side of the filter cover, a second filter plate is arranged on the left side of the first filter plate, a spiral leaf fan is arranged on the inner wall of the first filter plate, a sealing plug is clamped on the top end of the filter cover, a second locating plate is connected with the outer wall of the filter cover, a first locating plate is arranged on the top end of the filter cover, a bracelet is fixed on the top end of the sealing plug, a first bolt is movably arranged on the first locating plate, and a second bolt is movably arranged on the second locating plate.
The sealing structure comprises a first clamping cover, the bottom end of the first clamping cover is movably connected with a second clamping cover, the end part of the first clamping cover is fixedly provided with a mounting block, the inner wall of the first clamping cover is provided with heat insulation cotton, the inner side of the heat insulation cotton is provided with a spring, the end part of the spring is provided with a sealing ring, and the inner side of the mounting block is provided with a third bolt.
Preferably, the circular hand wheel is installed on the valve body, and the left side of valve body is connected with the oil pipe, the right side of oil inlet pipe is connected with the connecting pipe, the tip of oil pipe and connecting pipe all is fixed with the flange, the inboard of flange is connected with sealed pad.
Preferably, slots matched with the filter cover are formed in the top end and the inner wall of the oil inlet pipe, sealing patches are arranged on the inner wall of the slots, and the filter cover is fixedly connected with the oil inlet pipe through a second locating plate and a second bolt.
Preferably, the inner walls of the first filter plate and the second filter plate are respectively provided with a spiral leaf fan, the sealing plug and the filter cover are fixedly arranged through the first positioning plate and the first bolt, and the spiral leaf fans are rotationally connected with the first filter plate and the second filter plate through bearings.
Preferably, the first clamping cover and the second clamping cover are movably connected through hinges, and the first clamping cover, the second clamping cover and the flange are fixedly installed through the installation blocks and the third bolts.
Preferably, the inner sides of the first clamping cover and the second clamping cover are respectively provided with heat insulation cotton, a spring and a sealing ring.
Preferably, the heat insulation cotton is fixedly connected with the first clamping cover and the second clamping cover through glue, and the sealing ring is movably connected with the heat insulation cotton through a spring.
Compared with the prior art, the utility model has the following beneficial effects:
According to the utility model, the filter cover, the first filter plate and the spiral blade fan are arranged, the filter cover is fixed with the oil inlet pipe, then the sealing plug is fixed with the filter cover through the first positioning plate and the first bolt, when liquid enters the oil inlet pipe, the liquid passes through the first filter plate and the second filter plate with different apertures, so that impurities are intercepted in the filter cover, and simultaneously, the two spiral blade fans are pushed to rotate on the first filter plate and the second filter plate through the bearings when the liquid flows, so that the first filter plate and the second filter plate are cleaned when the liquid rotates, the impurity blockage is prevented, and the liquid is free from going.
According to the flange, the first clamping cover, the second clamping cover, the sealing rings and the heat insulation cotton are arranged, the first clamping cover and the second clamping cover are opened through the hinges and are clamped on the outer walls of the two flanges, at the moment, the third bolts are screwed into the inner sides of the mounting blocks at the ends of the first clamping cover and the second clamping cover, the first clamping cover and the second clamping cover are fixed on the flanges, the sealing rings on the inner walls of the first clamping cover and the second clamping cover are tightly attached between the gaps of the two flanges under the extrusion of the springs, the gaps are shielded, the tightness of the flanges is improved, the heat insulation cotton on the inner walls of the first clamping cover and the second clamping cover isolate the outside air temperature, the probability of being influenced by the external environment is reduced, the service life is prolonged, and the tightness of the flanges is super-strong under the double sealing treatment of the sealing rings.
Drawings
FIG. 1 is a schematic diagram of the overall structure of the present utility model;
FIG. 2 is a schematic elevational view of the present utility model;
FIG. 3 is a schematic view of the oil inlet pipe structure of the present utility model;
FIG. 4 is a schematic diagram of a filter structure according to the present utility model;
FIG. 5 is an enlarged schematic view of FIG. 3A according to the present utility model;
FIG. 6 is a schematic view of a sealing plug of the present utility model;
FIG. 7 is a schematic view of a first card cover according to the present utility model;
FIG. 8 is a schematic view of a seal ring of the present utility model;
Fig. 9 is a schematic view of a mounting block of the present utility model.
Wherein: 1. a valve body; 2. a circular hand wheel; 3. an oil inlet pipe; 4. an oil outlet pipe; 5. a filtering structure; 501. a filter cover; 502. a first filter plate; 503. a second filter plate; 504. spiral leaf fan; 505. a sealing plug; 506. a bracelet; 507. a first positioning plate; 508. a first bolt; 509. a second positioning plate; 510. a second bolt; 6. a connecting pipe; 7. a flange; 8. a sealing structure; 801. a first card cover; 802. a second card cover; 803. a mounting block; 804. a third bolt; 805. thermal insulation cotton; 806. a spring; 807. a seal ring; 9. and a sealing gasket.
Detailed Description
The following description of the embodiments of the present utility model will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present utility model, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.
Referring to fig. 1-6, a hydraulic control valve group based on electromagnetic cartridge valve, comprising a right side of a valve body 1 is connected with an oil inlet pipe 3, a filtering structure 5 is arranged on the oil inlet pipe 3, a flange 7 is fixed at an end part of the oil inlet pipe 3, a sealing structure 8 is arranged on the flange 7, the filtering structure 5 comprises a filtering cover 501, a first filtering plate 502 is arranged at an inner side of the filtering cover 501, a second filtering plate 503 is arranged at a left side of the first filtering plate 502, a spiral vane fan 504 is arranged at an inner wall of the first filtering plate 502, a sealing plug 505 is clamped at a top end of the filtering cover 501, a second positioning plate 509 is connected with an outer wall of the filtering cover 501, a first positioning plate 507 is arranged at a top end of the sealing plug 505, a bracelet 506 is movably arranged on the first positioning plate 507, a second bolt 510 is movably arranged on the second positioning plate 509, the valve body 1 is provided with a circular hand wheel 2, the left side of the valve body 1 is connected with an oil outlet pipe 4, the right side of an oil inlet pipe 3 is connected with a connecting pipe 6, the ends of the oil outlet pipe 4 and the connecting pipe 6 are both fixedly provided with a flange 7, the inner side of the flange 7 is connected with a sealing gasket 9, the top end and the inner wall of the oil inlet pipe 3 are both provided with slots matched with a filter cover 501, the inner wall of each slot is provided with a sealing paste, the filter cover 501 and the oil inlet pipe 3 are fixedly connected through a second positioning plate 509 and a second bolt 510, the inner walls of a first filter plate 502 and a second filter plate 503 are both provided with a spiral leaf fan 504, the sealing plug 505 and the filter cover 501 are fixedly installed through a first positioning plate 507 and a first bolt 508, the spiral leaf fan 504 is rotationally connected with the first filter plate 502 and the second filter plate 503, the filter cover 501 is inserted into the slots on the inner side of the oil inlet pipe 3 after complete insertion, the second bolt 510 passes through the second positioning plate 509 and is screwed into the top end of the oil inlet pipe 3, so that the filter cover 501 is fixed with the oil inlet pipe 3, then the sealing plug 505 is fixed with the filter cover 501 through the first positioning plate 507 and the first bolt 508, when liquid enters and passes through the oil inlet pipe 3, the impurities are filtered through the first filter plate 502 and the second filter plate 503 with different apertures respectively, so that the impurities are intercepted in the filter cover 501, and simultaneously the two spiral leaf fans 504 are pushed to rotate on the first filter plate 502 and the second filter plate 503 through bearings when the liquid flows, so that the first filter plate 502 and the second filter plate 503 are cleaned when the liquid rotates, the impurities are prevented from being blocked, the liquid is convenient to pass through, and when the impurities in the filter cover 501 are piled up, the liquid is taken out from the inner side of the oil inlet pipe 3, and the sealing plug 505 is opened for cleaning.
Referring to fig. 7-9, a hydraulic control valve group based on an electromagnetic cartridge valve, the sealing structure 8 includes a first card cover 801, a second card cover 802 is movably connected to the bottom end of the first card cover 801, a mounting block 803 is fixed to the end of the first card cover 801, a heat insulation cotton 805 is disposed on the inner wall of the first card cover 801, a spring 806 is disposed on the inner side of the heat insulation cotton 805, a sealing ring 807 is disposed on the end of the spring 806, a third bolt 804 is disposed on the inner side of the mounting block 803, the first card cover 801 and the second card cover 802 are movably connected through a hinge, the first card cover 801, the second card cover 802 and the flange 7 are fixedly mounted through the mounting block 803 and the third bolt 804, the heat insulation cotton 805, the spring 806 and the sealing ring 807 are disposed on the inner sides of the first card cover 801 and the second card cover 802, the heat insulation cotton 805 and the second card cover 802 are fixedly connected through glue, when the valve body 1 and other valve bodies are connected through the connecting pipe 6, the oil inlet pipe 3, the oil outlet pipe 4 and the connecting pipe 6 are respectively connected through the flange 7, the sealing performance of the sealing gasket 9 at the inner side of the flange 7 is improved, after the flange 7 is fixed, the first clamping cover 801 and the second clamping cover 802 are opened through hinges and clamped on the outer walls of the two flanges 7, at the moment, the third bolts 804 are screwed into the inner sides of the mounting blocks 803 at the end parts of the first clamping cover 801 and the second clamping cover 802, the first clamping cover 801 and the second clamping cover 802 are fixed on the flange 7, the sealing rings 807 at the inner walls of the first clamping cover 801 and the second clamping cover 802 are tightly attached between the gaps of the two flanges 7 under the extrusion of the springs 806, the sealing performance of the flange 7 is improved, the heat insulation cotton 805 at the inner walls of the first clamping cover 801 and the second clamping cover 802 isolate outside air temperature, the sealing gasket 9 on the inner side of the flange 7 reduces the possibility of being influenced by the external environment, further prolongs the service life, and ensures that the sealing performance of the flange 7 is super strong under the double sealing treatment of the sealing ring 807.
In use, the filter cover 501 is inserted into the slot on the inner side of the oil inlet pipe 3, after the filter cover 501 is completely inserted, the second bolt 510 is screwed into the top end of the oil inlet pipe 3 through the second positioning plate 509, so that the filter cover 501 is fixed with the oil inlet pipe 3, then the sealing plug 505 is fixed with the filter cover 501 through the first positioning plate 507 and the first bolt 508, when liquid enters the filter cover 501, the liquid passes through the oil inlet pipe 3 and is filtered by the first filter plate 502 and the second filter plate 503 with different apertures, so that impurities are intercepted in the filter cover 501, simultaneously, the two spiral leaf fans 504 are pushed to rotate on the first filter plate 502 and the second filter plate 503 through bearings when the liquid flows, thereby cleaning the first filter plate 502 and the second filter plate 503 when the liquid rotates, preventing the impurities from blocking, facilitating the smooth running of the liquid, when the impurities in the filter cover 501 are piled up, the liquid is taken out from the inner side of the oil inlet pipe 3, when the sealing plugs 505 are opened to clean, the oil inlet pipe 3, the oil outlet pipe 4 and the connecting pipes 6 are respectively connected with other valve bodies through the connecting pipes 6, the sealing gaskets 9 at the inner sides of the flanges 7 are increased in tightness, after the flanges 7 are fixed, the first clamping cover 801 and the second clamping cover 802 are opened through hinges and clamped on the outer walls of the two flanges 7, at the moment, the third bolts 804 are screwed into the inner sides of the mounting blocks 803 at the end parts of the first clamping cover 801 and the second clamping cover 802, the first clamping cover 801 and the second clamping cover 802 are fixed on the flanges 7, the sealing rings 807 at the inner walls of the first clamping cover 801 and the second clamping cover 802 are tightly attached between the gaps of the two flanges 7 under the extrusion of the springs 806, the gaps are shielded, the tightness of the flanges 7 is increased, the heat insulation cotton 805 at the inner walls of the first clamping cover 801 and the second clamping cover 802 isolate the outside air temperature, the gasket 9 inside the flange 7 is reduced from the external environment, the service life is prolonged, and the sealing performance of the flange 7 is super strong under the double sealing treatment of the sealing ring 807.
Although embodiments of the present utility model have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit thereof, the scope of which is defined in the appended claims and their equivalents.
Claims (7)
1. The utility model provides a hydraulic control valves based on electromagnetic cartridge valve, includes valve body (1), its characterized in that: the right side of the valve body (1) is connected with an oil inlet pipe (3), a filtering structure (5) is arranged on the oil inlet pipe (3), a flange (7) is fixed at the end part of the oil inlet pipe (3), and a sealing structure (8) is arranged on the flange (7);
the filter structure (5) comprises a filter cover (501), a first filter plate (502) is arranged on the inner side of the filter cover (501), a second filter plate (503) is arranged on the left side of the first filter plate (502), a spiral blade fan (504) is arranged on the inner wall of the first filter plate (502), a sealing plug (505) is clamped at the top end of the filter cover (501), a second positioning plate (509) is connected to the outer wall of the filter cover (501), a first positioning plate (507) is arranged at the top end of the filter cover (501), a bracelet (506) is fixed at the top end of the sealing plug (505), a first bolt (508) is movably arranged on the first positioning plate (507), and a second bolt (510) is movably arranged on the second positioning plate (509);
Seal structure (8) are including first card cover (801), the bottom swing joint of first card cover (801) has second card cover (802), and the tip of first card cover (801) is fixed with installation piece (803), the inner wall of first card cover (801) is provided with thermal-insulated cotton (805), the inboard of thermal-insulated cotton (805) is provided with spring (806), the tip of spring (806) is provided with sealing washer (807), the inboard of installation piece (803) is provided with third bolt (804).
2. The hydraulic control valve bank based on an electromagnetic cartridge valve of claim 1, wherein: install circular hand wheel (2) on valve body (1), and the left side of valve body (1) is connected with out oil pipe (4), the right side of advance oil pipe (3) is connected with connecting pipe (6), the tip of oil pipe (4) and connecting pipe (6) all is fixed with flange (7), the inboard of flange (7) is connected with sealed pad (9).
3. The hydraulic control valve bank based on an electromagnetic cartridge valve of claim 1, wherein: the top and the inner wall of the oil inlet pipe (3) are provided with slots matched with the filter cover (501), the inner wall of each slot is provided with a sealing paste, and the filter cover (501) is fixedly connected with the oil inlet pipe (3) through a second positioning plate (509) and a second bolt (510).
4. The hydraulic control valve bank based on an electromagnetic cartridge valve of claim 1, wherein: spiral leaf fans (504) are mounted on the inner walls of the first filter plate (502) and the second filter plate (503), sealing plugs (505) and the filter cover (501) are fixedly mounted through first positioning plates (507) and first bolts (508), and the spiral leaf fans (504) are rotatably connected with the first filter plate (502) and the second filter plate (503) through bearings.
5. The hydraulic control valve bank based on an electromagnetic cartridge valve of claim 1, wherein: the first clamping cover (801) and the second clamping cover (802) are movably connected through hinges, and the first clamping cover (801), the second clamping cover (802) and the flange (7) are fixedly installed through the installation blocks (803) and the third bolts (804).
6. The hydraulic control valve bank based on an electromagnetic cartridge valve of claim 1, wherein: the inner sides of the first clamping cover (801) and the second clamping cover (802) are respectively provided with heat insulation cotton (805), a spring (806) and a sealing ring (807).
7. The hydraulic control valve bank based on an electromagnetic cartridge valve of claim 1, wherein: the heat insulation cotton (805) is fixedly connected with the first clamping cover (801) and the second clamping cover (802) through glue, and the sealing ring (807) is movably connected with the heat insulation cotton (805) through a spring (806).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202322538667.4U CN220850198U (en) | 2023-09-19 | 2023-09-19 | Hydraulic control valve group based on electromagnetic cartridge valve |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202322538667.4U CN220850198U (en) | 2023-09-19 | 2023-09-19 | Hydraulic control valve group based on electromagnetic cartridge valve |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN220850198U true CN220850198U (en) | 2024-04-26 |
Family
ID=90746444
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202322538667.4U Active CN220850198U (en) | 2023-09-19 | 2023-09-19 | Hydraulic control valve group based on electromagnetic cartridge valve |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN220850198U (en) |
-
2023
- 2023-09-19 CN CN202322538667.4U patent/CN220850198U/en active Active
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN203060956U (en) | Drum type blocking preventing device of sewage or surface water source heat pump system | |
| CN212417393U (en) | Pulse dust removal auger material cleaning device | |
| CN220850198U (en) | Hydraulic control valve group based on electromagnetic cartridge valve | |
| CN111947175A (en) | Flue gas switching pipeline | |
| CN116753196A (en) | Vertical pump filter | |
| CN216136765U (en) | Dirt conveying device matched with automatic dirt cleaning machine at water inlet of radial flow type hydropower station | |
| CN215352742U (en) | Gas purifier of gas pressure regulator | |
| CN113606595B (en) | Multi-valve-group heat-storage high-temperature oxidation system | |
| CN210623851U (en) | Backflow pipeline convenient to install | |
| CN211175548U (en) | Sewage treatment is with check valve body that has filtering capability | |
| CN103191592A (en) | Filter easy to clean | |
| CN219712470U (en) | Electrically driven filtering gate valve | |
| CN103028287B (en) | Rotating drum type block prevention device for sewage or surface water source heat pump system | |
| CN220668511U (en) | Gate valve with filter element capable of being dynamically replaced | |
| CN215720894U (en) | Petal type regulating valve with anti-blocking function | |
| CN217854875U (en) | Heat supply pipeline scrubbing structure | |
| CN2763229Y (en) | Eenrgy-saving and low-leakage type air-seal machinery | |
| CN214249164U (en) | Desalting water tank regulating control valve | |
| CN220891094U (en) | Adjustable sealing butterfly valve | |
| CN218853762U (en) | Filter convenient to replace for isolator | |
| CN220750944U (en) | Rubber ball cleaning device | |
| CN215831170U (en) | Biological safety type airtight isolation valve | |
| CN218280777U (en) | Full-automatic sewage lamination formula filter | |
| CN213744976U (en) | Low-torque butterfly valve | |
| CN213271087U (en) | Pipeline adjusting device for heat supply and ventilation |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant |