1. A stormwater treatment system for eliminating solid debris and pollutants from drainage discharge comprising, in combination:
(a) a cylindrical vessel having a closed base adapted to be buried underground;
(b) an inner cylindrical wall, contained within the cylindrical vessel, and protruding upward from the vessel’s closed base forming an outer annular chamber and an inner cylindrical chamber;
(c) an inlet pipe extending through the wall of the cylindrical vessel for directing stormwater from the ground surface into the outer chamber and discharging the stormwater at a predetermined angle to an axis of the inlet pipe;
(d) a vertical pipe, contained within the inner cylindrical chamber and cylindrical vessel, said vertical pipe being open at opposed ends;
(e) an outlet pipe extending through the wall of the cylindrical vessel at a position diametrically opposed to the inlet pipe and further extending through the inner cylindrical wall to form a Tee with the vertical pipe; and
(f) at least one weir opening formed through the inner cylindrical wall at a predetermined height above the closed base.
2. The stormwater treatment system for eliminating solid debris and pollutants from drainage discharge, as in claim 1, wherein the predetermined angle is in a range of from about 45 to 90 and is in a generally horizontal plane.
3. The stormwater treatment system for eliminating solid debris and pollutants from drainage discharge as in claim 1 wherein at least one weir opening is a vertical slot.
4. The stormwater treatment system for eliminating solid debris and pollutants from drainage discharge as in claim 3 and further including an additional horizontal weir opening.
5. The stormwater treatment system for eliminating solid debris and pollutants from drainage discharge as in claim 4 wherein the horizontal weir is at a lower elevation than the inlet pipe, the outlet pipe, and a bottom end of the vertical slot relative to the closed base.
6. The stormwater treatment system for eliminating solid debris and pollutants from drainage discharge as in claim 1 wherein the inlet pipe, the outlet pipe and at least one opening are at the same elevation relative to the closed base.
7. A method for separating and eliminating solid debris from stormwater in a sewer system comprising the steps of:
(a) burying an outer cylindrical tank beneath the surface of the ground, said outer tank having a closed base supporting a concentrically disposed cylindrical wall to define an outer annular chamber and an inner cylindrical chamber said cylindrical wall having a weir opening formed through it at a first predetermined elevation about said base;
(b) providing a stormwater inlet pipe extending through the outer cylindrical tank leading to the annular chamber, the inlet pipe being in fluid communication with sewer inlet openings at ground surface and entering the outer cylindrical tank at said first predetermined elevation above the closed base;
(c) providing an outlet pipe that leads from the cylindrical chamber, through the cylindrical wall and through the outer cylindrical tank at said first predetermined elevation, the outlet pipe being connected to a vertically disposed vent pipe disposed in the cylindrical chamber and having an upper open end at an elevation above that of said cylindrical wall and a lower open end at a second predetermined elevation less than the first predetermined elevation; and
(d) allowing gravity to flow stormwater through the inlet pipe and around the annular chamber until the stormwater level in the annular chamber reaches the first predetermined elevation to flow through the weir opening into the cylindrical chamber, thereby increasing the settling time for solids present in the stormwater.
8. The method of claim 7 and further extending the settling time for solids circulating in the annular chamber by the time required for stormwater passing through
the weir to exit the cylindrical tank by way of the vent pipe and outlet pipe.
The claims below are in addition to those above.
All refrences to claim(s) which appear below refer to the numbering after this setence.
What is claimed is:
1. A color cathode ray tube comprising:
an evacuated envelope including a panel having an approximately rectangular shape formed by long sides and short sides and having an inner surface curved with an equivalent radius of curvature smaller than that of an outer surface as well as a phosphor screen formed on the inner surface, a neck accommodating an electron gun, and a funnel connecting the panel and the neck; and
a pressed mask having an apertured region disposed close to the inner surface of the panel and having a curvature curved to become convex toward the phosphor screen and multiple slots formed to be connected by bridges in their long-length directions,
wherein letting Rd (mm) be the equivalent radius of curvature of the outer surface of the panel in a diagonal direction thereof in the effective region of the phosphor screen and letting V (inch) be an effective diameter of the phosphor screen in a diagonal direction thereof,
Rd10(42.5V45.0),
the optical transmissivity of the panel being 60% or less,
the opening rate per unit area of the slots in the pressed mask being larger at an end of the apertured region in the diagonal direction than in the center of the apertured region.
2. A color cathode ray tube according to claim 1, wherein letting P1 be the connection-direction pitch of slots in the center of the apertured region of the pressed mask and letting P2 be the connection-direction pitch of slots at the end of the apertured region in the diagonal direction,
P1<P2.
3. A color cathode ray tube according to claim 1, wherein letting P1 be the connection-direction pitch of slots in the center of the apertured region of the pressed mask, letting P2 be the connection-direction pitch of slots at the end of the apertured region in the diagonal direction,
letting B1 be the connected-slot space width of each of bridges in the center of the apertured region, and letting B2 be the connected-slot space width of each of bridges at the end of the apertured region in the diagonal direction,
P1<P2 and B1>B2.
4. A color cathode ray tube according to claim 1, wherein letting B1 be the connected-slot space width of each of bridges in the center of the apertured region of the pressed mask and letting B2 be the connected-slot space width of each of bridges at the end of the apertured region in the diagonal direction,
B1>B2.
5. A color cathode ray tube according to claim 1, wherein the optical transmissivity of the panel is 50% or less.
6. A color cathode ray tube comprising:
an evacuated envelope including a panel having an approximately rectangular shape formed by long sides and short sides and having an inner surface curved with an equivalent radius of curvature smaller than that of an outer surface as well as a phosphor screen formed on the inner surface, a neck accommodating an electron gun, and a funnel connecting the panel and the neck; and
a pressed mask having an apertured region disposed close to the inner surface of the panel and having a curvature curved to become convex toward the phosphor screen and multiple slots formed to be connected by bridges in their long-length directions,
wherein letting Rd (mm) be the equivalent radius of curvature of the outer surface of the panel in a diagonal direction thereof in the effective region of the phosphor screen and letting V (inch) be an effective diameter of the phosphor screen in a diagonal direction thereof,
Rd10(42.5V45.0),
letting Td be the thickness in a tube-axis direction of the end of the panel in the diagonal direction in the effective region of the phosphor screen and letting Tc be the thickness in the tube-axis direction of the center of the panel,
(TdTc)Tc0.8,
the ratio of the bridges per unit area in the pressed mask being larger in the center of the apertured region than at the end of the apertured region in the diagonal direction.
7. A color cathode ray tube according to claim 6, wherein letting P1 be the connection-direction pitch of slots in the center of the apertured region of the pressed mask and letting P2 be the connection-direction pitch of slots at the end of the apertured region in the diagonal direction,
P1<P2.
8. A color cathode ray tube according to claim 6, wherein letting P1 be the connection-direction pitch of the slots in the center of the apertured region of the pressed mask, letting P2 be the connection-direction pitch of the slots at the end of the apertured region in the diagonal direction,
letting B1 be the connected-slot space width of each of bridges in the center of the apertured region, and letting B2 be the connected-slot space width of each of bridges at the end of the apertured region in the diagonal direction,
P1<P2 and B1>B2.
9. A color cathode ray tube according to claim 6, wherein letting B1 be the connected-slot space width of each of bridges in the center of the apertured region of the pressed mask and letting B2 be the connected-slot space width of each of bridges at the end of the apertured region in the diagonal direction,
B1>B2.
10. A color cathode ray tube according to claim 6, wherein TdTc12 mm.
11. A color cathode ray tube according to claim 6, wherein the optical transmissivity of the panel is 60% or less.
12. A color cathode ray tube according to claim 6, wherein (TdTc)Tc0.7.
13. A color cathode ray tube according to claim 12, wherein TdTc10 mm.
14. A color cathode ray tube according to claim 12, wherein the optical transmissivity of the panel is 50% or less.
15. A color cathode ray tube according to claim 6, wherein an effective diameter of the phosphor screen in the diagonal direction thereof is 76 cm or more.
16. A color cathode ray tube comprising:
an evacuated envelope including a panel having an approximately rectangular shape formed by long sides and short sides and having an inner surface curved with an equivalent radius of curvature smaller than that of an outer surface as well as a phosphor screen formed on the inner surface, a neck accommodating an electron gun, and a funnel connecting the panel and the neck; and
a pressed mask having an apertured region disposed close to the inner surface of the panel and having a curvature curved to become convex toward the phosphor screen and multiple slots formed to be connected by bridges in their long-length directions,
wherein letting Rd (mm) be the equivalent radius of curvature of the outer surface of the panel in a diagonal direction thereof in the effective region of the phosphor screen and letting V (inch) be an effective diameter of the phosphor screen in a diagonal direction thereof,
Rd10(42.5V45.0),
the opening rate per unit area of the slots in the pressed mask being larger at an end of the apertured region in the diagonal direction than in the center of the apertured region,
the ratio of the bridges per unit area in the pressed mask being larger in the center of the apertured region than at the end of the apertured region in the diagonal direction.
17. A color cathode ray tube according to claim 16, wherein letting P1 be the connection-direction pitch of slots in the center of the apertured region of the pressed mask and letting P2 be the connection-direction pitch of slots at the end of the apertured region in the diagonal direction,
P1<P2.
18. A color cathode ray tube according to claim 16, wherein letting P1 be the connection-direction pitch of the slots in the center of the apertured region of the pressed mask, letting P2 be the connection-direction pitch of the slots at the end of the apertured region in the diagonal direction, letting B1 be the connected-slot space width of each of bridges in the center of the apertured region, and letting B2 be the connected-slot space width of each of bridges at the end of the apertured region in the diagonal direction,
P1<P2 and B1>B2.
19. A color cathode ray tube according to claim 16, wherein letting B1 be the connected-slot space width of each of bridges in the center of the apertured region of the pressed mask and letting B2 be the connected-slot space width of each of bridges at the end of the apertured region in the diagonal direction,
B1>B2.
20. A color cathode ray tube according to claim 16, wherein an effective diameter of the phosphor screen in the diagonal direction thereof is 76 cm or more.