JP2015150487A - Water treatment tank using low pressure mercury lamp - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a water treatment tank using a low pressure mercury lamp, in which the low pressure mercury lamp can be positioned and held at a predetermined position in a water cooling jacket by employing simple structure.SOLUTION: The water treatment tank using a low pressure mercury lamp is provided which includes at least one water cooling jacket arranged partially in the tank, and a low pressure mercury lamp inserted in the inside of the water-cooling tank and having bases at both end parts respectively. The base is positioned and captured by a base positioning and holding member having a base locking part for obstructing transfer in a lamp axial direction, of the base, a jacket pressing part for maintaining a contact state of the base with respect to the water cooling jacket, and a base capturing part for capturing the base.

Description

  The present invention relates to a water treatment tank using a low-pressure mercury lamp.

  Typical examples of water treatment tanks using a low-pressure mercury lamp include running water sterilization treatment equipment used in septic tanks for beverages, ultraviolet oxidation water treatment equipment for producing ultrapure water used in semiconductor manufacturing, and the like.

  FIG. 1A is a view showing a horizontal water treatment tank 10-1 in which a plurality of water cooling jackets (also referred to as “sleeves”) 6 are arranged in a horizontal direction. On the other hand, FIG. 1B is a view showing a vertical water treatment tank 10-2 in which a plurality of water cooling jackets 6 are arranged in the vertical direction.

  In any of the treatment tanks 10-1 and 10-2, the water to be treated flows in a certain direction. That is, water is supplied from the water supply port 2 to the inside of the water treatment tank, subjected to ultraviolet treatment while passing around the water cooling jacket 6, and discharged from the drain port 4 to the outside. In a large-scale plant treatment tank, several hundred low-pressure mercury lamps 8 are provided, and the water flow reaches 400,000 tons / day.

  Inside each water-cooled jacket 6, one low-pressure mercury lamp 8 having bases 12-1 and 12-2 at both ends is inserted, and the bases 12-1 and 12-2 are inner peripheral surfaces of the jacket 6. In contact.

  The low-pressure mercury lamp 8 contains mercury or amalgam (an alloy of mercury and other metals). In particular, the arc tube of the amalgam lamp is formed with a recess (not shown) in which the amalgam stays, and the outer peripheral surface of the recess forming portion is in contact with the bases 12-1 and 12-2.

JP 2007-73472 "Low pressure mercury lamp device" (release date 2007/03/22) Applicant: Iwasaki Electric Co., Ltd. JP 2011-48968 "Low-pressure mercury lamp and sterilization or disinfection method" (release date 2011/03/10) Applicant: Iwasaki Electric Co., Ltd. JP 2011-71020 "Low pressure mercury lamp and its coldest part temperature control method" (release date 2011/04/07) Applicant: Iwasaki Electric Co., Ltd. JP 2011-258321 “Amalgam type low-pressure mercury lamp and lamp lighting power supply device” (release date 2011/12/22) Applicant: Iwasaki Electric Co., Ltd.

  In general, the ultraviolet output of a low-pressure mercury lamp depends on the vapor pressure of mercury or amalgam in the arc tube when the lamp is lit. The vapor pressure of mercury or amalgam is determined by the temperature of the coldest part of the arc tube of the low-pressure mercury lamp. The periphery of the coldest part is covered with the bases 12-1 and 12-2, and the temperature of the base depends on the high temperature when the lamp is lit and the low temperature due to contact with the water cooling jacket 6.

  In a state where the low-pressure mercury lamp 8 is inserted into the water-cooling jacket 6, the water-cooling jacket 6 and the treatment tanks 10-1 and 10-2 are vibrated by running water during water treatment, and the bases 12-1 and 12-2 are The inner peripheral surface of the water cooling jacket 6 is not completely contacted, and the mercury vapor pressure of the lamp 8 cannot be properly controlled. As a result, the amount of ultraviolet radiation is attenuated. In the horizontal water treatment tank 10-1, it can be expected that the lamp 8 is maintained in contact with the water cooling jacket to some extent due to the influence of gravity. Therefore, this phenomenon is particularly remarkable in the vertical water treatment tank 10-2.

  Further, in the amalgam lamp, the low-pressure mercury lamp 8 in the water cooling jacket rotates around the lamp axis, and the amalgam moves from a predetermined stop location. As a result, the lamp cannot maintain an appropriate operating temperature, and the amount of ultraviolet radiation is attenuated.

  When positioning the low-pressure mercury lamp, changing the structure of the arc tube and the base itself is a major change, and these standard products cannot be used, leading to an increase in cost. Accordingly, an object of the present invention is to provide a water treatment tank using a low-pressure mercury lamp that can position and hold the low-pressure mercury lamp at a predetermined position in a water-cooling jacket with a simple structure.

  In view of the above object, a water treatment tank using a low-pressure mercury lamp according to the present invention is inserted into at least one water-cooling jacket partially disposed in the tank, and the water-cooling jacket. A water treatment tank using low-pressure mercury lamps each having a low-pressure mercury lamp having a base, wherein the base includes a base locking portion that prevents movement of the base in the lamp axial direction, and the water-cooling jacket of the base Positioning and capturing are performed by a base positioning holding member having a jacket pressing portion that maintains a contact state with respect to the base and a base capturing portion that captures the base.

Furthermore, in the water treatment tank using the low-pressure mercury lamp, the base positioning holding member may be formed such that the base locking portion, the jacket pressing portion, and the base capturing portion are integrally formed.
Furthermore, in the water treatment tank using the low-pressure mercury lamp, the base positioning holding member is formed after at least part or all of the base locking portion, the jacket pressing portion, and the base capturing portion are separately formed. It may be integrally formed by the fixing means.
Further, in the water treatment tank using the low-pressure mercury lamp, the jacket pressing portion of the base positioning holding member may have a curved surface for pressing the jacket.
Furthermore, in the water treatment tank using the low-pressure mercury lamp, the water treatment tank may be a vertical water treatment tank or a horizontal water treatment tank.

  ADVANTAGE OF THE INVENTION According to this invention, the water treatment tank using a low pressure mercury lamp which can position and hold | maintain a low pressure mercury lamp in the predetermined position in a water cooling jacket with a simple structure can be provided.

FIG. 1A is a diagram showing a horizontal water treatment tank in which a plurality of water cooling jackets (also referred to as “sleeves”) are arranged in a horizontal direction. FIG. 1B is a diagram showing a vertical water treatment tank in which a plurality of water cooling jackets are arranged in a vertical direction. FIG. 2 is a diagram showing a low-pressure mercury lamp. FIG. 3A is a diagram illustrating a structure in which the low-pressure mercury lamp is positioned and held at a predetermined position in the water cooling jacket with a simple structure. FIG. 3B is a view for explaining an example of the base positioning holding member shown in FIG. 3A. FIG. 4A is a diagram illustrating another example of the base locking portion of the base positioning holding member shown in FIG. 3B. 4B is a diagram for explaining another example of the water cooling jacket pressing portion of the base positioning holding member shown in FIG. 3B. FIG. 4C is a diagram illustrating another example of the base capturing portion of the base positioning holding member shown in FIG. 3B.

  Hereinafter, embodiments of a water treatment tank using a low-pressure mercury lamp according to the present invention will be described in detail with reference to the accompanying drawings. In the figure, the same reference numerals are assigned to the same elements, and duplicate descriptions are omitted.

(Low pressure mercury lamp)
FIG. 2 is a diagram showing a low-pressure mercury lamp. Mercury or amalgam is enclosed in the arc tube 8-1 of the low-pressure mercury lamp 8. The amalgam is an alloy containing at least one of indium In, bismuth Bi, tin Sn, and lead Pb in addition to mercury Hg.

  The low-pressure mercury lamp 8 includes bases (bases) 12-1 and 12-2 at both ends of the arc tube 8-1, and the bases 12-1 and 12-2 are the coldest parts of the arc tube tube. Covers the end of the arc tube. The bases 12-1 and 12-2 are covers for fixing the arc tube and preventing the end of the arc tube from being damaged. The bases 12-1 and 12-2 are formed of ceramics, metal, or an elastic resin having ultraviolet resistance (for example, a fluororesin). In the prototype stage of this embodiment, ceramics having a thickness of 1.0 mm were used as the bases 12-1 and 12-2.

  The bases 12-1 and 12-2 support the arc tube 8-1 in contact with the water cooling jacket 6 (see FIG. 3A). Therefore, the coldest part of the arc tube wall is affected by both the high temperature heat generation temperature of the lamp itself and the temperature of the low temperature base 12 in contact with the water cooling jacket 6 cooled by the water to be treated. The temperature of the water to be treated is usually about 25 ° C.

  In general, the ultraviolet output of the low-pressure mercury lamp 8 depends on the vapor pressure of mercury or amalgam in the arc tube when the lamp is turned on. By controlling the temperature of the coldest part of the arc tube wall, the mercury vapor pressure inside the lamp can be controlled. By maintaining the coldest part of the arc tube wall at 40 ° C., the low-pressure mercury lamp 8 has the maximum ultraviolet output with a wavelength of 254 nm.

  Since the high heat generation temperature of the lamp itself is known in advance, in order to maintain the coldest part of the arc tube tube wall at 40 ° C., a base formed of a predetermined material and shape is attached to the water cooling jacket 6. On the other hand, it is important to make sure that the contact is made. That is, it is important that the base 12 is kept in contact with the water cooling jacket 6 regardless of the vibration of the water cooling jacket or the water treatment tank.

(Structure where the low-pressure mercury lamp is positioned and held in the water-cooled jacket)
FIG. 3A is a diagram illustrating a structure in which the low-pressure mercury lamp is positioned and held at a predetermined position in the water cooling jacket with a simple structure. Here, (A) is a partial cross-sectional view cut along the lamp axis near the lamp end, and (B) is a BB cross-sectional view. An arc tube 8-1 is disposed inside the water cooling jacket 6. The water cooling jacket 6 is provided for insulation between the lamp and water to be treated and protection against damage to the lamp, and is made of a member (for example, quartz glass) having ultraviolet transparency.

  The arc tube 8-1 is attached to the base 12-2 at one end. The base 12-2 is held at a predetermined position inside the water cooling jacket 6 by the base positioning holding member 16. The opposite end of the lamp has a similar structure.

  FIG. 3B is a diagram illustrating an example of the base positioning holding member 16 shown in FIG. 3A. The base positioning / holding member 16 is, for example, (1) a base locking portion (see a broken-line ellipse) 16− as a stopper that locks at the lamp axial direction end of the base and prevents the base from moving in the lamp axial direction. 1 and (2) a jacket pressing portion 16-2 made of a material having spring elasticity and maintaining the contact state of the base 12-2 with the water cooling jacket by pressing the inner surface of the water cooling jacket 6 with a spring restoring force. (3) It is made of a material having flexibility and has a base capturing part 16-3 for capturing the base.

  The base locking portion 16-1, the jacket pressing portion 16-2, and the base capturing portion 16-3 may be formed as an integrally formed article, or may be welded or the like after at least a part or the whole is separately formed. It may be formed integrally by the means described above. The material of these members may be metal, resin, or the like.

Therefore, the base positioning and holding member 16 can be realized with any desired structure as long as it has the following functions (a) to (c).
(a) Stopper function to prevent the base 12 from moving in the lamp axis direction
(b) The function of maintaining the contact state of the base 12 with the water cooling jacket 6
(c) Function to capture the base 12

  The base positioning and holding member 16 having the functions (a) to (c) is also effective in a mercury lamp and an amalgam lamp. Furthermore, such a base positioning holding member 16 is also effective in the horizontal water treatment tank 10-1 and the vertical water treatment tank 10-2.

  Another example of the base positioning and holding member 16 having these functions will be described. FIG. 4A is a diagram illustrating another example of the base locking portion 16-1 of the base positioning holding member 16 shown in FIG. 3B. Here, a part of both ends of the base positioning / holding member 16 is bent inward and locked to the end of the base 12. Thereby, the stopper function which prevents the movement of the base 12 in the lamp axis direction is achieved.

  FIG. 4B is a view for explaining another example of the water cooling jacket pressing portion 16-2 of the base positioning holding member 16 shown in FIG. 3B, and FIG. 4B is a sectional view taken along the line BB. The water cooling jacket pressing portion 16-2 is formed of an elliptical member made of a flexible metal or the like. By pressing the height of the elliptical member 16-2 from above and inserting it into a narrow water-cooling jacket, the base 12 is pushed in the direction of the water-cooling jacket by the restoring force. Thereby, the function which maintains the contact state with respect to the water cooling jacket 6 of the base 12 is fulfill | performed.

  In this case, as shown to (B), it is preferable that the center of the width direction of the water cooling jacket press part 16-2 is curving convexly upwards. This is because, when the contact surface with respect to the water cooling jacket 6 is an aspect, when the water cooling jacket pressing portion 16-2 presses the inner peripheral surface of the water cooling jacket 6, the inner peripheral surface is not damaged or damaged.

  FIG. 4C is a diagram illustrating another example of the base capturing portion 16-3 of the base positioning / holding member 16 illustrated in FIG. 3B. Unlike the base capture portion shown in FIG. 3B, this base capture portion 16-3 has the shape of a rib. Thereby, the function of capturing the base 12 is exhibited.

  According to the present embodiment, the low-pressure mercury lamp 8 can be positioned at a predetermined position in the water-cooling jacket 6 simply by preparing the positioning holding member 16 as an attachment without changing the structure of the arc tube and the base itself. There are advantages and effects that can be maintained.

(Summary)
The embodiments of the water treatment tank using the low-pressure mercury lamp according to the present invention have been described above, but these are examples for understanding the present invention and do not limit the scope of the present invention. Additions, deletions, modifications, and improvements that can be easily made by those skilled in the art with respect to these embodiments are within the scope of the present invention. The technical scope of the present invention is defined by the description of the appended claims.

2: water supply port, 4: drainage port, 6: jacket, water cooling jacket, 8: lamp, low-pressure mercury lamp, 8-1: arc tube, 10: treatment tank, 10-1: horizontal water treatment tank, 10-2: Vertical water treatment tank, 12, 12-1, 12-2: base, 16: base positioning and holding member, 16-1: base locking portion, 16-2: jacket pressing portion, 16-3: base capturing portion,

Claims (5)

At least one water-cooled jacket partially disposed in the tank;
In a water treatment tank using a low-pressure mercury lamp that is inserted into the water-cooling jacket and has low-pressure mercury lamps each having a base at both ends,
The base includes a base locking portion that prevents the base from moving in the lamp axis direction, a jacket pressing portion that maintains a contact state of the base with the water-cooling jacket, and a base positioning and holding portion that captures the base. A water treatment tank that is positioned and captured by a member. In the water treatment tank using the low-pressure mercury lamp according to claim 1,
The said base positioning holding member is a water treatment tank in which the said base latching | locking part, the said jacket press part, and the said base capture | acquisition part are formed as an integrated shaping thing. In the water treatment tank using the low-pressure mercury lamp according to claim 1,
The base positioning and holding member is a water treatment tank in which at least a part or all of the base locking portion, the jacket pressing portion, and the base capturing portion are separately formed and then integrally formed by a fixing means. In the water treatment tank using the low-pressure mercury lamp according to claim 1,
The jacket pressing portion of the base positioning and holding member is a water treatment tank in which a surface that presses the jacket is a curved surface. In the water treatment tank using the low-pressure mercury lamp according to claim 1,
The water treatment tank is a water treatment tank which is a vertical water treatment tank or a horizontal water treatment tank.

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