CN212615391U - Conveniently-disassembled three-dimensional flow permanent magnet pipeline type centrifugal pump - Google Patents
Conveniently-disassembled three-dimensional flow permanent magnet pipeline type centrifugal pump Download PDFInfo
- Publication number
- CN212615391U CN212615391U CN202020901723.XU CN202020901723U CN212615391U CN 212615391 U CN212615391 U CN 212615391U CN 202020901723 U CN202020901723 U CN 202020901723U CN 212615391 U CN212615391 U CN 212615391U
- Authority
- CN
- China
- Prior art keywords
- dimensional flow
- accommodating cavity
- impeller
- pump
- permanent magnet
- 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
Images
Abstract
A conveniently-disassembled three-dimensional flow permanent magnet pipeline type centrifugal pump comprises: a pump body for mounting the three-dimensional flow impeller and allowing fluid to pass therethrough; a flow channel and a first accommodating cavity are arranged on the pump body; the connecting bracket is used for mounting the three-dimensional flow impeller together with the pump body; the connecting bracket is connected with the pump body and is provided with a second accommodating cavity, and the first accommodating cavity is opposite to the second accommodating cavity and forms an accommodating cavity together; a tertiary flow impeller for driving fluid to flow through the flow channels; the three-dimensional flow impeller is arranged in the accommodating cavity and is respectively and tightly abutted to the inner wall of the first accommodating cavity and the inner wall of the second accommodating cavity. The mounting positions and gaps of the three-dimensional flow impeller, the pump body and the connecting support are adjustable by using the backing ring and the spring, so that the three-dimensional flow impeller, the pump body and the connecting support are convenient to disassemble; the three-dimensional flow impeller reduces the friction loss of fluid in the pump, reduces cavitation erosion, impact and noise generated by water flow, and improves the operating efficiency of the centrifugal pump.
Description
Technical Field
The utility model belongs to the technical field of the centrifugal pump, concretely relates to just, tear formula three-dimensional flow permanent magnetism pipeline formula centrifugal pump open.
Background
The pipeline type centrifugal pump is used for conveying clean water, corrosive liquid or other liquid with physical and chemical properties similar to water, and is suitable for aspects of industrial and urban drainage, pressurization and water supply of high-rise buildings, fire control pressurization, remote conveying and the like.
Disclosure of Invention
In order to solve the above problem, the utility model provides a just, tear formula three-dimensional flow permanent magnetism pipeline formula centrifugal pump open, include:
a pump body for mounting the three-dimensional flow impeller and allowing fluid to pass therethrough; a flow channel and a first accommodating cavity are arranged on the pump body;
the connecting bracket is used for mounting the three-dimensional flow impeller together with the pump body; the connecting bracket is connected with the pump body and is provided with a second accommodating cavity, and the first accommodating cavity is opposite to the second accommodating cavity and forms an accommodating cavity together;
a tertiary flow impeller for driving fluid to flow through the flow channels; the three-dimensional flow impeller is arranged in the accommodating cavity and is respectively and tightly abutted to the inner wall of the first accommodating cavity and the inner wall of the second accommodating cavity.
Preferably, a sealing O-shaped ring is arranged at the joint of the connecting bracket and the pump body.
Preferably, one end of the three-dimensional flow impeller, which faces the connecting support, is provided with a connecting pump shaft.
Preferably, a sealing assembly is arranged between the connecting pump shaft and the three-dimensional flow impeller.
Preferably, a supporting and positioning bearing is arranged between the connecting pump shaft and the connecting bracket.
Preferably, the connecting support is provided with a clamp spring, and two sides of the supporting and positioning bearing are respectively abutted by the connecting support and the clamp spring.
Preferably, the three-dimensional flow impeller includes: the impeller comprises impeller blades, a front cover plate and a rear cover plate, wherein the front cover plate and the rear cover plate are both circular and coaxially arranged, the impeller blades are respectively connected with the front cover plate and the rear cover plate, and all the impeller blades are uniformly arranged along the circumference and are respectively perpendicular to the front cover plate and the rear cover plate.
Preferably, a first groove is formed in the inner wall of the three-dimensional flow impeller, a first stepped sealing bulge is formed in the inner wall of the pump body, and the first stepped sealing bulge and the first groove are abutted and tightly attached to each other.
Preferably, a second groove is formed in the inner wall, in contact with the connecting support, of the pump body, a second stepped sealing protrusion is arranged on the connecting support, and the second stepped sealing protrusion and the second groove are abutted and tightly attached to each other.
Preferably, the seal assembly comprises: the pump comprises a fixing ring, a rotating ring, a backing ring and a spring, wherein the fixing ring, the rotating ring and the backing ring are all sleeved on the pump receiving shaft, the rotating ring is located between the fixing ring and the backing ring and respectively and tightly abutted against the fixing ring and the backing ring, and two ends of the spring are respectively and tightly abutted against the backing ring and the three-dimensional flow impeller.
The utility model has the advantages that:
(1) a supporting and positioning bearing is arranged between the connecting support and the connecting pump shaft to support the three-dimensional flow impeller and the connecting pump shaft to rotate under the coaxiality so as to reduce the abrasion of the stepped sealing bulges, and two grooves are additionally arranged at the stepped sealing positions of the three-dimensional flow impeller, the pump body and the connecting support respectively, so that a hydraulic water film can be formed when the three-dimensional flow impeller drives fluid to rotate at a high speed, the abrasion of the grounding sealing surface is further reduced, and the using effect of the centrifugal pump is improved;
(2) the sealing assembly is arranged on the outer side of a connecting pump shaft between the connecting support and the three-dimensional flow impeller, primary sealing is carried out through the fixing ring, the rotating ring is connected through threads to lock the fixing ring, and the position of the rotating ring is fixed through the spring and the backing ring, so that the fixed ring and the rotating ring are prevented from being separated in the rotating process, the sealing effect is improved, the corrosion of fluid to a motor is reduced, and the service life of the centrifugal pump is prolonged;
(3) the mounting positions and gaps of the three-dimensional flow impeller, the pump body and the connecting support can be adjusted by using the backing ring and the spring, so that the three-dimensional flow impeller, the pump body and the connecting support are convenient to disassemble;
(4) the three-dimensional flow impeller reduces the friction loss of fluid in the pump, reduces cavitation erosion, impact and noise generated by water flow, and improves the operating efficiency of the centrifugal pump.
(5) The permanent magnet synchronous motor is characterized in that the motor efficiency of the permanent magnet synchronous motor is higher than that of an asynchronous motor, and the rotating speed can be adjusted through a frequency converter, so that a water pump can be accurately controlled under the field working condition; the performance of the three-dimensional flow in the water pump is also high in efficiency of the water pump, and the combination of the three-dimensional flow and the water pump can achieve higher or highest unit operation efficiency, so that the aim of saving electricity is achieved.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without inventive exercise.
Fig. 1 is a schematic view of an overall structure of a conveniently detachable three-dimensional flow permanent magnetic pipeline type centrifugal pump provided by the present invention;
fig. 2 is a schematic view of the overall structure of a removable three-dimensional flow permanent magnetic pipeline centrifugal pump provided by the present invention;
fig. 3 is an enlarged schematic view of a part of the structure of a conveniently detachable three-dimensional flow permanent magnetic pipeline type centrifugal pump provided by the present invention;
fig. 4 is a schematic structural diagram of a three-dimensional flow impeller in a conveniently detachable three-dimensional flow permanent magnetic pipeline centrifugal pump provided by the present invention;
fig. 5 is a schematic structural diagram of a sealing assembly in a conveniently detachable three-dimensional flow permanent magnetic pipeline type centrifugal pump provided by the present invention;
in the figure, 1 is a permanent magnet synchronous motor, 2 is a connecting pump shaft, 3 is a connecting support, 4 is a three-dimensional flow impeller, 4-1 is an impeller blade, 4-2 is a front cover plate, 4-3 is a rear cover plate, 5 is a pump body, 6 is a sealing assembly, 7 is a supporting and positioning bearing, 8 is a connecting bolt, 9 is a first groove, 10 is a first step sealing bulge, 11 is a second groove, 12 is a fixing ring, 13 is a rotating ring, 14 is a backing ring, 15 is a spring, and 16 is a second step sealing bulge.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described in detail with reference to the accompanying drawings. It should be understood that the description is intended to be illustrative only and is not intended to limit the scope of the present invention. Moreover, in the following description, descriptions of well-known structures and techniques are omitted so as to not unnecessarily obscure the concepts of the present invention.
Referring to fig. 1 to 5, in an embodiment of the present application, the present application provides a removable three-dimensional flow permanent magnet pipe type centrifugal pump, including: a connecting bracket 3, a three-dimensional flow impeller 4 and a pump body 5, each of which is described in detail below.
Referring to fig. 1 to 5, in an embodiment of the present application, the present application provides a removable three-dimensional flow permanent magnet pipe type centrifugal pump, including:
a pump body 5 for mounting the three-dimensional flow impeller 4 and allowing fluid to pass therethrough; a flow channel and a first accommodating cavity are arranged on the pump body 5;
the connecting bracket 3 is used for mounting the three-dimensional flow impeller 4 together with the pump body 5; the connecting bracket 3 is connected with the pump body 5 and is provided with a second accommodating cavity, and the first accommodating cavity is opposite to the second accommodating cavity and forms an accommodating cavity together;
a three-dimensional flow impeller 4 for driving a fluid to flow through the flow channel; the three-dimensional flow impeller 4 is arranged in the accommodating cavity and is respectively and tightly abutted against the inner wall of the first accommodating cavity and the inner wall of the second accommodating cavity.
The three-dimensional flow impeller 4 infinitely divides the three-dimensional space in the impeller according to the 'three-dimensional flow theory', and establishes a complete and real mathematical model of fluid flow in the impeller by analyzing each working point in an impeller flow channel, and carries out grid division and flow field calculation. The three-dimensional flow design method is used for optimizing factors such as the inlet and outlet placement angle of the blades, the number of the blades, the shape of each section of the twisted blades and the like, and the structure of the three-dimensional flow design method can adapt to the real flow state of the fluid, so that the flow separation of the working surface of the blades is avoided, the flow loss is reduced, the speed distribution of all fluid particles in the water pump can be controlled, the optimal flow state in the water pump is obtained, and the fluid conveying efficiency is guaranteed to be optimal. Compared with the secondary flow impeller, the flow and the lift of the three-flow impeller with the same specification and volume are improved, and the efficiency is improved, the running current is small, and the electricity is saved obviously.
In the embodiment of the application, the pump body 5 and the three-dimensional flow impeller 4 are internally sprayed with nano composite ceramic paint, so that the inner walls of the flow channels are smoother and have extremely high hardness, the friction coefficient between fluid and the cavities is reduced, the flow channels of the three-dimensional flow impeller 4 and the cavities of the pump body 5 are more worn and smoother, and the three-dimensional flow impeller has a certain self-lubricating function, extremely high non-water-sticking property, acid and alkali resistance, corrosion resistance, tiger resistance and other characteristics.
Referring to fig. 1 to 5, in the embodiment of the present application, a connection pump shaft 2 is disposed at one end of the three-dimensional flow impeller 4 facing the connection bracket 3, the connection bracket 3 is connected to a permanent magnet synchronous motor 1, and the permanent magnet synchronous motor 1 is connected to the three-dimensional flow impeller 4 through the connection pump shaft 2. The permanent magnet synchronous motor 1 outputs power to the connecting pump shaft 2, and the connecting pump shaft 2 drives the three-dimensional flow impeller 4 to rotate, so that fluid is driven to flow through the pump body 5.
Referring to fig. 1-5, in the embodiment of the present application, a sealing assembly 6 is disposed between the connecting pump shaft 2 and the three-dimensional flow impeller 4. The sealing assembly 6 can enhance the sealing property between the connecting pump shaft 2 and the three-element flow impeller 4.
As shown in fig. 1 to 5, in the present embodiment, the seal assembly 6 includes: the pump comprises a fixing ring 12, a rotating ring 13, a backing ring 14 and a spring 15, wherein the fixing ring 12, the rotating ring 13 and the backing ring 14 are all sleeved on the pump receiving shaft, the rotating ring 13 is located between the fixing ring 12 and the backing ring 14 and respectively and tightly abuts against the fixing ring 12 and the backing ring 14, and two ends of the spring 15 respectively and tightly abut against the backing ring 14 and the three-dimensional flow impeller 4. Fixed ring 12 outside threaded connection rotating ring 13 to guarantee fixed ring 12 and the inseparable degree of contact of being connected pump shaft 2, set up backing ring 14 in rotating ring 13 bottom, and set up spring 15 between backing ring 14 and impeller 4, support rotating ring 13, rotating ring 13 influences sealed effect with fixed ring 12's position separation when preventing high-speed rotation, has reduced fluidic seepage, has prolonged the life of motor and centrifugal pump.
Referring to fig. 1 to 5, in the embodiment of the present application, the connecting bracket 3 is connected to the permanent magnet synchronous motor 1 through a connecting bolt 8. The connecting bolt 8 can keep the connection stability between the connecting bracket 3 and the permanent magnet synchronous motor 1.
As shown in fig. 1 to 5, in the embodiment of the present application, the three-dimensional flow impeller 4 includes: the impeller comprises impeller blades 4-1, a front cover plate 4-2 and a rear cover plate 4-3, wherein the front cover plate 4-2 and the rear cover plate 4-3 are both circular and coaxially arranged, the impeller blades 4-1 are respectively connected with the front cover plate 4-2 and the rear cover plate 4-3, and all the impeller blades 4-1 are uniformly arranged along the circumference and are respectively perpendicular to the front cover plate 4-2 and the rear cover plate 4-3. The three-dimensional flow impeller 4 can adapt to the real flow state of fluid, avoid the flow separation of the working surface of the impeller blade 4-1, reduce the flow loss, noise and the impact of the fluid and the pump body 5, and improve the fluid conveying efficiency of the centrifugal pump.
Referring to fig. 1-5, in the embodiment of the present application, a support positioning bearing 7 is disposed between the connection pump shaft 2 and the three-dimensional flow impeller 4. The three-dimensional flow impeller is characterized in that a first groove 9 is formed in the inner wall of the three-dimensional flow impeller 4, a first stepped sealing protrusion 10 is formed in the inner wall of the pump body 5, and the first stepped sealing protrusion 10 and the first groove 9 are abutted and tightly attached to each other. The inner wall of the pump body 5, which is in contact with the connecting support 3, is provided with a second groove 11, the connecting support 3 is provided with a second stepped sealing bulge 16, and the second stepped sealing bulge 16 and the second groove 11 are abutted against and tightly attached to each other.
In the embodiment of the application, a sealing O-ring is arranged at the joint of the connecting bracket 3 and the pump body 5, and the sealing O-ring can enhance the waterproof performance between the connecting bracket 3 and the pump body 5; the connecting support 3 is provided with a clamp spring, and two sides of the supporting and positioning bearing 7 are respectively abutted by the connecting support 3 and the clamp spring. The clamp spring and the connecting support 3 jointly limit and support the positioning bearing 7, so that the supporting and positioning bearing 7 is prevented from moving up and down, and the stability of the supporting and positioning bearing is kept.
When the permanent magnet synchronous motor works, the permanent magnet synchronous motor 1 drives the three-dimensional flow impeller 4 to rotate at a high speed in the pump body 5 through the connection pump shaft 2, the support positioning bearing 7 can ensure that the connection pump shaft 2 cannot deviate, the abrasion of the two step seal bulges is small, the step seal between the sealing ring and the connecting support 3 can effectively prevent pressure leakage, a layer of hydraulic water film can be formed on the surfaces of the first groove 9 and the second groove 11, the hydraulic water film can support the three-dimensional flow impeller 4, the abrasion between the sealing ring and the connecting support 3 and between the three-dimensional flow impeller 4 and the pump body 5 is reduced, the first groove 9, the second groove 11 and one step seal bulge form complete water film pressure support, the axial force of the water pump is reduced, and the service life of the water pump is prolonged.
According to the conveniently-detached three-dimensional flow permanent magnet pipeline type centrifugal pump, the supporting and positioning bearing is arranged between the connecting support and the connecting pump shaft to support the three-dimensional flow impeller and the connecting pump shaft to rotate under the coaxiality so as to reduce the abrasion of the step sealing bulge, and the two grooves are additionally arranged at the step sealing positions of the three-dimensional flow impeller, the pump body and the connecting support respectively, so that a hydraulic water film can be formed when the three-dimensional flow impeller drives fluid to rotate at a high speed, the abrasion of the grounding sealing surface is further reduced, and the using effect of the centrifugal pump is improved; the sealing assembly is arranged on the outer side of a connecting pump shaft between the connecting support and the three-dimensional flow impeller, primary sealing is carried out through the fixing ring, the rotating ring is connected through threads to lock the fixing ring, and the position of the rotating ring is fixed through the spring and the backing ring, so that the fixed ring and the rotating ring are prevented from being separated in the rotating process, the sealing effect is improved, the corrosion of fluid to a motor is reduced, and the service life of the centrifugal pump is prolonged; the mounting positions and gaps of the three-dimensional flow impeller, the pump body and the connecting support can be adjusted by using the backing ring and the spring, so that the three-dimensional flow impeller, the pump body and the connecting support are convenient to disassemble; the three-dimensional flow impeller reduces the friction loss of fluid in the pump, reduces cavitation erosion, impact and noise generated by water flow, and improves the operating efficiency of the centrifugal pump.
It is to be understood that the above-described embodiments of the present invention are merely illustrative of or explaining the principles of the invention and are not to be construed as limiting the invention. Therefore, any modification, equivalent replacement, improvement and the like made without departing from the spirit and scope of the present invention should be included in the protection scope of the present invention. Further, it is intended that the appended claims cover all such variations and modifications as fall within the scope and boundaries of the appended claims or the equivalents of such scope and boundaries.
Claims (10)
1. The utility model provides a just, tear formula ternary flow permanent magnetism pipeline formula centrifugal pump open which characterized in that includes:
a pump body for mounting the three-dimensional flow impeller and allowing fluid to pass therethrough; a flow channel and a first accommodating cavity are arranged on the pump body;
the connecting bracket is used for mounting the three-dimensional flow impeller together with the pump body; the connecting bracket is connected with the pump body and is provided with a second accommodating cavity, and the first accommodating cavity is opposite to the second accommodating cavity and forms an accommodating cavity together;
a tertiary flow impeller for driving fluid to flow through the flow channels; the three-dimensional flow impeller is arranged in the accommodating cavity and is respectively and tightly abutted to the inner wall of the first accommodating cavity and the inner wall of the second accommodating cavity.
2. The easy-to-detach type three-dimensional flow permanent magnet pipeline type centrifugal pump according to claim 1, wherein a sealing O-shaped ring is arranged at the joint of the connecting bracket and the pump body.
3. The easy-to-detach type three-dimensional flow permanent magnet pipe type centrifugal pump as claimed in claim 1, wherein one end of the three-dimensional flow impeller facing the connecting bracket is provided with a connecting pump shaft.
4. The removable three-dimensional flow permanent magnet pipe centrifugal pump according to claim 3, wherein a sealing assembly is provided between the connection pump shaft and the three-dimensional flow impeller.
5. The easy-to-detach type three-dimensional flow permanent magnet pipeline type centrifugal pump according to claim 3, wherein a supporting and positioning bearing is arranged between the connecting pump shaft and the connecting bracket.
6. The easy-to-detach type three-dimensional flow permanent magnet pipeline type centrifugal pump according to claim 5, wherein a clamp spring is arranged on the connecting support, and two sides of the supporting and positioning bearing are respectively abutted by the connecting support and the clamp spring.
7. The easy-to-detach type ternary-flow permanent magnet ducted centrifugal pump as claimed in claim 1, wherein the ternary-flow impeller comprises: the impeller comprises impeller blades, a front cover plate and a rear cover plate, wherein the front cover plate and the rear cover plate are both circular and coaxially arranged, the impeller blades are respectively connected with the front cover plate and the rear cover plate, and all the impeller blades are uniformly arranged along the circumference and are respectively perpendicular to the front cover plate and the rear cover plate.
8. The easy-to-detach three-dimensional flow permanent magnet pipeline type centrifugal pump according to claim 1, wherein a first groove is formed in the inner wall of the three-dimensional flow impeller, a first stepped sealing protrusion is formed in the inner wall of the pump body, and the first stepped sealing protrusion and the first groove are abutted and tightly attached to each other.
9. The easy-to-detach three-dimensional flow permanent magnet pipeline type centrifugal pump according to claim 1, wherein a second groove is formed in an inner wall of the pump body, which is in contact with the connecting support, a second stepped sealing protrusion is arranged on the connecting support, and the second stepped sealing protrusion and the second groove are abutted and tightly attached to each other.
10. The removable ternary flow permanent magnet ducted centrifugal pump of claim 4, wherein said seal assembly comprises: the pump comprises a fixing ring, a rotating ring, a backing ring and a spring, wherein the fixing ring, the rotating ring and the backing ring are all sleeved on the pump receiving shaft, the rotating ring is located between the fixing ring and the backing ring and respectively and tightly abutted against the fixing ring and the backing ring, and two ends of the spring are respectively and tightly abutted against the backing ring and the three-dimensional flow impeller.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020901723.XU CN212615391U (en) | 2020-05-26 | 2020-05-26 | Conveniently-disassembled three-dimensional flow permanent magnet pipeline type centrifugal pump |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020901723.XU CN212615391U (en) | 2020-05-26 | 2020-05-26 | Conveniently-disassembled three-dimensional flow permanent magnet pipeline type centrifugal pump |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN212615391U true CN212615391U (en) | 2021-02-26 |
Family
ID=74750588
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202020901723.XU Active CN212615391U (en) | 2020-05-26 | 2020-05-26 | Conveniently-disassembled three-dimensional flow permanent magnet pipeline type centrifugal pump |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN212615391U (en) |
-
2020
- 2020-05-26 CN CN202020901723.XU patent/CN212615391U/en active Active
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN101871449B (en) | Small rotor-type submersible pump | |
| CN108087291B (en) | High-lift long-blade molded line rear cavity structure centrifugal pump | |
| CN201851390U (en) | Novel single-stage double-suction centrifugal pump | |
| CN212615391U (en) | Conveniently-disassembled three-dimensional flow permanent magnet pipeline type centrifugal pump | |
| CN206054312U (en) | High-efficient energy-saving centrifugal pump | |
| CN101709720B (en) | Novel high-efficient energy-saving pump | |
| CN203770146U (en) | Vacuum self-sucking pump | |
| CN211976026U (en) | Impeller type anti-blocking rotating joint | |
| CN100470059C (en) | Novel water pump | |
| CN210290245U (en) | Centrifugal pump with friction sealing layer | |
| CN112502985A (en) | Combined low-cavitation multistage centrifugal pump | |
| CN202326273U (en) | Vertical self-priming pump with fixed reversed bending impeller | |
| CN213116728U (en) | Integral type water pump structure | |
| CN219911159U (en) | Ultra-large sand pumping ship pump | |
| CN204572472U (en) | A kind of rotational flow self-priming pump | |
| CN219587783U (en) | Vortex type vertical axial flow pump | |
| CN115263756B (en) | High-efficiency liquid ring vacuum pump | |
| CN213298305U (en) | Pump in pipe suitable for air conditioning system | |
| CN202833139U (en) | Constant flow vane pump | |
| CN203114743U (en) | Single-stage single-suction type chemical centrifugal pump | |
| CN212717339U (en) | Energy-saving novel water pump | |
| CN207333282U (en) | efficient double-suction centrifugal pump | |
| CN218953574U (en) | High-speed anti-corrosion high-suction water pump | |
| CN219452498U (en) | Special turbine impeller with splitter blades | |
| CN213450849U (en) | IH structure centrifugal pump with good stability |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant |