Ultraviolet Lamp Assembly

This invention relates to devices for purifying water in an aquarium, and more particularly to an improved ultraviolet lamp assembly for such device.

A known ultraviolet lamp assembly used in devices for purifying water in aquarium, as shown in FIG. 1, comprises a tubular housing 1 with open ends, two plugs 3 removably secured to the open ends of the housing 1 against fluid pressure and an ultraviolet lamp 2 retained by the plugs 3 in the housing 1 and cooperating therewith to provide an annular fluid flow channel 13 for fluid to be irradiated. An inlet port 11 is formed in an end portion of the housing 1 for connection to a source of fluid under pressure to be irradiated and is directly communicating with the fluid flow channel 13. An outlet port 12 is formed in another end portion of the housing 1 and is also directly communicating with the fluid flow channel 13 for discharging irradiated fluid.

It is found that in such known devices during operation of the lamp, calcium and other colloidal matter tends to coat the lamp envelope or other transparent medium separating the fluid from the lamp, thus building up a scale or other contamination which reduces the intensity of the ultraviolet rays and therefore reduces the effectiveness of the lamp in destroying the microorganisms. Moreover, the water or fluid to be irradiated flowing directly from inlet port 11 to outlet port 12 is too short in distance and too soon in time spending to be fully sterilized. To this end, the inventor has attempted to make an improved ultraviolet lamp assembly to overcome the drawbacks of a known ultraviolet lamp assembly.

An object of this invention is to provide an ultraviolet lamp assembly which can diminish the disadvantages of a known assembly.

It is another object of this invention to provide an ultraviolet lamp assembly with a construction allowing for conducting a swirling motion to the water passing therethrough to prolong flowing distance and time spending for an effective irradiating treatment.

FIG. 1 is a cross-sectional view illustrating a known ultraviolet lamp assembly;

FIG. 2 is an exploded perspective view of the ultraviolet lamp assembly according to this invention;

FIG. 3 is a cross-sectional view of this invention which is in assembled state;

FIG. 4 is a cross-sectional view of the embodiment with a casing ready for installation in an aquarium; and

FIG. 5 is a cross-sectional view illustrating another embodiment of this invention.

Referring to FIGS. 2 & 3, the ultraviolet lamp assembly according to this invention comprises a high intensity ultraviolet lamp 1 and a compartment 2 being wrapped in a helical pattern around and along the length of the lamp 1. The wave length of the ultraviolet lamp 1 is preferably in a range of 1400 to 3900 A and, in general, the effective distance for sterilization of the ultraviolet lamp 1 is 1.0 cm whereby the diameter of cross section of the compartment 2 is preferably 1.0 cm.

A tubular housing 3 of appropriate material and preferably of a material such as stainless steel or other highly reflective material with respective to ultraviolet rays is provided for enveloping the ultraviolet lamp 1 and the helical compartment 3 and has two open ends. Two identical plugs 4, 5 formed with inlet port 41 and outlet port 51 both bent 90 degrees towards attachment ends thereof are secured to the open ends of the housing 3 to seal the same against fluid pressure. The ultraviolet lamp 1 is located in inwardly spaced relation within the reflector housing 3 and extends lengthwise therethrough by means of the helical compartment 2 of which the outer periphery abuts against the inner side wall of the housing 3 and the inner periphery abuts against the outer side wall of the lamp 1 whereby providing a helical fluid flow passage 21 for irradiating water.

The inlet port 41 bent 90 degrees to communicate with the inlet end of the helical passage 21 is press-fitted with an inlet pipe 42 for connection to a water source under pressure to be sterilized in an aquarium and the outlet port 51 bent 90 degrees to communicate with the outlet end of the helical passage 21 is press-fitted with an outlet pipe 52 for discharging irradiated water into the aquarium. The electric supply conductors 11, 12 extend outwardly through the plugs 4, 5.

Said helical passage 21 defined by the compartment 2 between the housing 3 and lamp 1 prolongs the flow distance and time spending of water flow, thus rendering a thorough sterilization to the water to be irradiated. Moreover, the helical passage 21 conducts a swirling motion to the water passing through the assembly to remove any particles which may tend to settle on the lamp covering 1.

As shown in FIG. 4, the ultraviolet assembly is further provided with a casing 6 for water-tightly enveloping the ultraviolet lamp assembly shown in FIG. 3. Said water inlet pipe 42 is connected to an inlet opening 61 formed in the casing 6 for water suction and said water outlet pipe 52 is connected to an outlet opening 62 formed in the casing 6 for water discharge. Said electric supply conductors 11, 12 are collected at the same side of the assembly and extend outwardly through the casing 6. The ultraviolet assembly so constructed is ready for installation in an aquarium.

Referring to FIG. 5, another embodiment of this invention is simplified in construction by providing two identical bends 8 communicatively connected to two open ends of the housing 3 through joints 7. This embodiment of the ultraviolet lamp assembly can be applied to an aquarium in combination with a conventional filter 9 which is accommodated with a loose granular activated charcoal or other suitable filtering material. Water in the aquarium passes first through the filter 9 to filter out any solids and then passes through inlet joint 8 and lengthwise through the helical passage 21 around the ultraviolet lamp assembly where it is thoroughly exposed to ultraviolet irradiation. Finally, the sterilized fluid is discharged through the outlet bend 8.

It is intended that all matter contained in the above description or shown in the accompanying drawing be interpreted as illustrative and not in a limiting sense. It is also to be understood that the following claims are intended to cover all of the generic and specific features of the invention herein described.