JPH0743317B2 - Double spray tower - Google Patents

Description

Detailed Description of the Invention

[0001]

[Industrial field of application] The present invention relates to a spraying device for spraying a corrosive solution as fine particles on a sample in a test tank of a corrosion acceleration tester having a gable roof shape on the ceiling. It relates to techniques for atomizing fine particles.

[0002]

2. Description of the Related Art FIG. 4 shows an example of the structure of a conventional spray tower 17,
FIG. 5 shows an example of a corrosion acceleration tester in which the spray tower 17 is arranged in the center of the test tank 33, which is a Japanese Industrial Standard (JIS) Z23.
71 is a front main part configuration diagram of the salt spray tester 18 in which the ceiling part of the test tank is a gable roof shape, as defined in 71 "Salt spray test method" and the like, and FIG.

In the spray tower 17 shown in FIG. 4, a solution reservoir 19 for storing a corrosive solution is connected to the bottom of an upright cylinder 8, and a circular air passage hole 20 is provided around the lower portion of the cylinder 8.
A plurality of are provided. A corrosive solution 21 is supplied to the solution reservoir 19 from a solution tank 22 (see FIG. 5) for supplying the corrosive solution through a solution supply pipe 23.

Further, the atomizer 4 for ejecting the corrosive solution 21 in the solution reservoir 19 as fine particles has an acute angle with the straight tubular liquid nozzle tube 5 having a sharp tip and fine holes. An L-shaped air nozzle tube 6 in which a tip portion provided with a narrow pore is bent at a right angle is integrally configured so that both nozzle tip portions are close to each other in the same plane.

The sprayer 4 is detachably fixed to a sprayer holding portion 9 having an opening which is close to the position of the air circulation hole 20 and into which the sprayer 4 is fitted. Further, the sprayer holder 9 can be fixed so that when the sprayer 4 is inserted into the cylinder 8, the tip ends of both nozzle tubes are located on the central axis of the cylinder 8. The sprayer 4 holds the nozzle tube 6 for air. The tip is attached so that it points vertically upward.

At the other end of the liquid nozzle tube 5, a solution reservoir 1
A solution pipe 24 connected to the inside of the solution 9 is attached, and a filter 25 for removing dust and the like in the solution is attached to an end of the solution pipe 24 located in the solution reservoir 19. An air pipe 27 connected to an air saturator 26 for supplying saturated air having a predetermined pressure is connected to the other end of the air nozzle pipe 6. or,
Air having a predetermined pressure is supplied to the air saturator 26 from, for example, an air compressor 28 (see FIG. 5).

Above the cylinder 8, there is provided a trumpet-shaped conical direction body 29 for adjusting the spraying direction and distance of the fine particles sprayed from the sprayer 4. The direction body 29 is loosely fitted to the upper outer periphery of the cylinder 8, and two thin columns 32 fixed vertically to a ring 31 fixed to the cylinder by a screw 30.
And is fixed to the upper end of the cylinder 8 with a slight gap. Further, when the direction body 29 is attached to the cylinder 8 via the ring 31, this top portion is located substantially on the central axis of the cylinder 8.

A salt spray tester 18 as shown in FIGS. 5 and 6.
The horizontal cross section of the test tank 33 is rectangular because it is possible to arrange the samples efficiently, to make it easy to test not only flat samples but also actual products including long samples, and to efficiently manufacture the device. Has become. Further, the ceiling of the test tank has a gable roof shape so that the spray solution accumulated therein does not drop onto the sample surface. In the above JIS, this angle is defined as about 100 degrees.

Now, in such a salt spray tester 18,
Test tank 3 adjusted to a prescribed test temperature (generally 35 ° C)
In the nozzle 3, saturated air having a predetermined pressure is jetted from the tip of the nozzle tube 6 for air, the corrosive solution is sucked from the solution reservoir 19, and jetted as fine particles together with the saturated air from the tip of the nozzle tube 5 for liquid. The ejected fine particles of the corrosive solution rise together with the air taken in from the air circulation holes 20 while spreading in the cylinder 8 in a substantially inverted conical shape, and the fine particles having a large particle size are in the middle of rising or in the direction. It collides with the body 29 and falls into the cylinder 8. Further, some of the small-sized particles rising along the inner wall of the cylinder 8 also come into contact with the inner wall and fall. Therefore, particles having a relatively small particle size and relatively uniformized are sprayed concentrically into the test tank 33 through the gap between the direction body 29 and the upper end of the cylinder 8 to accelerate the corrosion of the sample 34.

Here, if the jetting pressure of saturated air is adjusted to a constant value (generally specified at 1 kgf / cm ² including JIS), the amount of inflow air from the air flow hole 20 and the size of the direction body 29 are adjusted. Now, depending on the width of the gap between the upper surface of the direction body 29 and the upper end of the cylinder 8, the spraying direction and the spraying amount of the fine particles sprayed from the spraying tower 17 into the test tank 33 change. For example,
The amount of inflow air from the air circulation hole 20 is made constant, and the direction body 2
When the upper surface of 9 is enlarged, it is sprayed relatively far, and when the gap between the upper surface of the direction body 29 and the tip of the cylinder 8 is widened, it is sprayed more upward. Therefore, in general, the amount of inflow air from the air circulation hole 20 and the method of mounting the direction body 29 are determined by the test tank 33.
The optimum spraying state in accordance with the device for arranging the spraying tower 17 such as the size of, for example, the spraying amount per hour, at any position on the plane where the sample is placed in the test tank
It is adjusted in advance so that it falls within the range of 1-2 cc specified for IS.

[0011]

In a corrosion acceleration test such as a salt spray test, it is essential that the sample in the test tank is uniformly corroded and that the corrosion state can be repeatedly reproduced. For this purpose, especially in the test tank. It is important that the corrosive solution be uniformly sprayed onto the sample placed therein.

For this reason, even in the case of a device satisfying the spray collection amount of 1 to 2 cc per hour specified in JIS, recent industrial materials and products have been subjected to tough corrosion resistance treatment, Since it takes a long time to reproduce the corrosion result, a large difference (variation) may occur in the corrosion result depending on the test time.

The cause of this variation is largely due to the structure of the device in which the spray cylinder is arranged. That is, since the fine particles of the corrosive solution are concentrically sprayed from the spray cylinder, the amount of the spray collected is gradually reduced from the spray cylinder side in the concentric shape. Therefore, if the samples are arranged at the same distance from the spray tower, there should be no variation among the samples, but this does not always occur depending on the structure of the test tank. For example, in the salt spray tester shown in FIG. 5 and FIG. 6, even at the same distance from the spray cylinder, at the inclined side position of the gable roof of the test tank ceiling,
Compared to the position in the right angle direction, the drop density of fine particles increases with the inclination, so that the spray collection amount tends to increase.

[0014]

[Table 1]

Table 1 shows the spray sampling amount at each position on the sample mounting plane in the salt spray tester, and the sampling positions are shown in FIG. In this figure, the size of the test tank is about 900 mm × 600 mm in horizontal section, and the spray tower is arranged in the center thereof. Further, the ceiling of the test tank has a gable roof shape inclined toward the long side direction. Spray collection positions b, e, f, i are about 200 mm, d, g are about 350 mm,
a, c, h, j are about 400 mm away from the spray tower.

[0016] Here, the amount of the spray collected is 3 in the test tank temperature.
It is a numerical value obtained by spraying a salt solution having a concentration of 5% at a pressure of 1 Kgf / cm ² at 5 ° C. and operating for 24 hours, and then converting the collected amount at each sampling position into the collected amount per hour.

From this table, it is understood that in the conventional spray tower, the amount of spray collected is different even at the position equidistant from the spray cylinder. The amount of spray collected was within the range conforming to the JIS, but the maximum was 1.85 CC and the minimum was 1.1 CC, and the difference was 0.75 CC, which was a large variation.

As a device for eliminating the variation in the amount of spray collected depending on the distance from the spray tower, there is a corrosion test device 38 disclosed in Japanese Patent Publication No. 56-24896 as shown in FIG. This is the same as the conventional spray tower 17 arranged in the center of a cylindrical test tank 35 having a hemispherical ceiling.
An annular frame 37 that rotates around the spray tower 17 is provided by the rotating mechanism 36 and the like, and the sample 34 is fixed to the annular frame 37. According to this device, the amount of spray collected can be made uniform. However, the sample is limited to a flat plate attached to the annular frame. In addition, the construction of the device such as the provision of the rotating mechanism and the hemispherical processing of the ceiling of the test tank becomes complicated, and the manufacturing cost becomes high.

Therefore, in order to carry out a reliable corrosion promotion test, the samples are efficiently arranged without increasing the cost of the equipment, and not only the flat sample but also the actual product including the long sample is tested. There has been a long-felt demand for the development of a spray tower that facilitates and makes the spray distribution in the test tank uniform.

[0020]

In order to solve the above-mentioned problems, firstly, in a conventional spray tower, an object having a diameter and a size smaller than that of the cylinder and having a vertical plane passing through the central axis of the small cylinder as its center. Remove the upper part of this small cylinder with two flat planes, make it a pentagonal shape where the upper part becomes an isosceles triangle when viewed from the front, and make a notch hole at its lower end or a long hole in its side circumference, The liquid nozzle tube and the air nozzle tube of the atomizer are arranged at positions where they are loosely fitted in the cutout holes or the long holes, and the central axis of the straightening cylinder is aligned with the central axis of the cylinder, and the vertical and horizontal The means was a double spray tower that was fixed and configured so that position adjustment in direction and tilt adjustment were possible.

In addition, a double spray tower is constructed by forming a cutout hole or a long hole in the straightening cylinder, shortening the entire length, and arranging the double spray tower at an upper position close to the liquid nozzle tube of the sprayer. And the means.

[0022]

According to the double spray tower 1 of the first and second embodiments of the present invention which employs the above means, the double spray tower 1 is arranged in the cylinder 8.
The sprayer 4 is provided in the straightening cylinder 2 or below the straightening cylinder 2.
By arranging and ejecting fine particles at a predetermined pressure,
Since the lower peripheral portion inside the flow straightening cylinder 2 has a negative pressure, the air flowing into the cylinder 8 from the air circulation hole 20 is larger in the flow straightening cylinder 2 per predetermined area than in the other portions inside the cylinder 8. It will flow in and its speed will increase.

Therefore, the fine particles rising with the inflowing air have a higher rising speed, the rising direction is adjusted by the cylindrical portion of the flow straightening cylinder 2, and the fine particles rise while spreading in an inverted conical shape. During this ascending process, fine particles collide with the isosceles triangular portion of the flow straightening cylinder, and the inverse cone shape spreads,
It becomes, so to speak, elliptical and is sprayed into the test tank from between the upper part of the cylinder and the direction body.

Here, the spray tower containing the rectifying cylinder is
If the above isosceles triangular portion of the straightening cylinder is arranged in the test tank of the salt spray tester shown in FIG. 5 and FIG. 6 so as to be positioned in the oblique direction of the gable roof, Since the amount of spray in that direction is small, the amount of spray collected in the test tank will be more uniform.

[0025]

Embodiments of the present invention will be described in detail below with reference to the drawings.

(First Embodiment) FIG. 1 is a sectional view of the entire double spray tower 1 of the first embodiment of the present invention, and FIG.
It is a partial perspective view of the detail fixed to FIG. In FIG. 1, the basic structure of the double spray tower 1 is the same as that of the conventional spray tower 17 shown in FIG. 4 except that the flow straightener 2 is attached. Hereinafter, a description will be given together with FIG.

The rectifying cylinder 2 has a smaller diameter and a smaller size than the cylinder 8 described above, and the upper part of the small cylinder is removed by two symmetrical planes centering on a vertical plane passing through the central axis of the small cylinder. A pentagonal shape that becomes an isosceles triangle (when rotated 90 degrees, the front view of this isosceles triangle becomes an M shape), and a rectangular cutout hole 3 is opened from the lower end to the upper part. . The notch hole 3 has a size such that the liquid nozzle tube 5 and the air nozzle tube 6 of the sprayer 4 can be fitted with a slight margin. On the opposite side of the cutout hole 3, a round rod-shaped fixing rod 7 can be screwed at a right angle to the side circumference.

Further, on the opposite side of the opening of the sprayer holding portion 9 provided in the cylinder 8, there is formed a long hole 10 having a width and a length in which the fixing rod 7 can be inserted with a margin. Further, on the side circumference of the cylinder 8, two sets of set screws 11 are fixed at the upper side and the lower side so that the elongated hole 10 is located at the center. A fixed plate 12 having a curvature is attached to the set screw 11 to cover the elongated hole 10 from the outside of the cylinder 8. The long holes 10 are formed near the four corners of the fixing plate 12.
Holes 13 into which the set screws 11 are loosely fitted are provided so as to be located at the central portions of the. If the set screw 11 is tightened with the nut 14 larger than the hole 13, the fixing plate 12 is fixed to the side circumference of the cylinder 8.

In addition, a small hole through which the fixing rod 7 passes is provided in the center of the fixing plate 12, and the fixing tool 1 in the shape of a short cylinder having the same diameter as this.
5 is fixed to the center of this small hole, and a through screw is cut on this side circumference so that the knurled screw 16 can be screwed.

To mount the flow straightening cylinder 2 thus constructed, the fixed plate 12 is fixed to the side circumference of the cylinder 8 and the fixed rod 7 is inserted into the small hole of the fixed plate 12. The straightening cylinder 2 has the notch hole 3 facing downward, and the sprayer 4 is provided through the notch hole 3.
The liquid nozzle 5 and the air nozzle 6 are inserted into the rectifying cylinder 2, and the fixing rod 7 is screwed at the position where the central axis of the rectifying cylinder 2 coincides with the central axis of the cylinder 8. . The fixing rod 7 is fixed to the fixing device 15 with a knurled screw 16.

Further, the mounting position of the flow straightening cylinder 2 is vertically moved by the holes 13 near the four corners of the fixing plate 12 so that in the horizontal direction, the holes 13 near the four corners of the fixing plate 12 surround the cylinder 8 side. It can be adjusted by shifting the top horizontally and moving the fixing rod 7 back and forth. Further, by rotating the fixed rod 7, it is possible to change the inclination of the flow straightening cylinder 2 in a plane perpendicular to the fixed rod 7.

The size of the rectifying cylinder 2, that is, the inner diameter, the outer diameter and the length, is smaller than the inner diameter of the cylinder 8,
The length relationship between the size of the inner diameter and the length from the same position as the tip of the liquid nozzle tube 5 to the bottom position of the isosceles triangle is such that most of the fine particles ejected in an approximately conical shape do not come into contact with each other. The height of the isosceles triangle depends on the size of the test tank. Further, the length from the same position as the tip of the liquid nozzle tube 5 to the lower position is almost the same as the lower end position of the sprayer 4, and is a length that does not cover all the air circulation holes 20 on the side circumference of the cylinder 8. There is.

In this embodiment, the inner diameter of the cylinder 8 is about 66 mm, the straightening cylinder 2 has an outer diameter of about 48 mm, an inner diameter of about 40 mm, and a length above the same position as the tip of the liquid nozzle tube 5 is about 40 mm. The height of the isosceles triangle is about 40 mm, the length from the same position as the tip of the liquid nozzle tube 5 to the lower end is about 40 mm, and the long hole is about 45 mm × 15 mm.

(Second Embodiment) FIG. 3 is a sectional view of the entire double spray tower 1 of the second embodiment. The rectifying cylinder 2 of this embodiment has the same shape as that of the rectifying cylinder 2 of the first embodiment except that the cutout hole 3 is not provided, and is mounted close to and above the liquid nozzle tube 5 of the sprayer 4. That is, as in the first embodiment, the fixing rod 7 screwed into the side circumference at a right angle, the long hole 10 provided at the opposite side of the sprayer holding portion 9 on the side circumference of the cylinder 8, and the long hole 10
Fixing screws 11 provided at two positions, an upper position and a lower position so as to be located at the center, holes 13 into which the fixing screws 11 are loosely fitted, which are fixed to the fixing screws 11, near the four corners, and a fixing plate 12 having a curvature. The center axis of the rectifying cylinder 2 is attached so as to match the center axis of the cylinder 8 by. The mounting position can be changed in the vertical direction, the horizontal direction, and the inclination as in the first embodiment.

The size of the rectifying cylinder 2 of this embodiment, that is,
The inner diameter and the length are such that most of the fine particles ejected in a substantially conical shape do not come into contact with each other. The outer diameter is about 48 mm and the inner diameter is about 40 mm, which is the same as the first embodiment, and the length is the first embodiment. The length from the same position as the tip of the liquid nozzle tube 5 to the base of the isosceles triangle is about 40 mm, and the height of the isosceles triangle is also about 40 mm. Further, it is separated from the liquid nozzle tube 5 by about 8 mm.

(Experimental example) Table 2 shows the double spray tower according to the first embodiment of the present invention, in which the center of the test tank of the salt spray tester (see FIGS. 5 and 6) is the center of the rectifying cylinder. The equilateral triangular portion is arranged so as to be located in the direction of the hypotenuse of the gable roof shape of the ceiling of the test tank (that is, the long side of the horizontal cross section of the test tank), and the test is performed under the same test conditions as in Table 1, and FIG. It is the result of measuring the sprayed amount at the sprayed amount sampling position.

[0037]

[Table 2]

From Table 2, according to the double spray tower of the present invention,
It is possible to obtain a more uniform spray amount distribution over the entire area of the test tank with almost the same amount at the spray amount sampling position of the cylinder distance from the spray tower, b, e, f, i (maximum minimum difference 0.05 cc). I understood. That is, in the above-mentioned spray collecting positions, the maximum amount is 1.55 cc, the minimum amount is 1.25 cc, and the difference is 0.3 cc, which is less than half the difference in the conventional case of 0.75 cc. became. The average spray amount was 1.40 cc in the case of this embodiment and 1.42 cc in the case of the above-mentioned conventional case, which were almost the same.

Further, although the result of the experiment conducted under the same conditions as above using the double spray tower of the second embodiment is not particularly described, almost the same spray result as in Table 1 was obtained.

[0040]

[Effect] When the double spray tower according to the first embodiment of the present invention is arranged in the center of the test tank of the salt spray tester (see FIGS. 5 and 6) and used, a conventional spray tower is used. The average spray amount was the same as that in the case, and a more uniform spray amount distribution was obtained over the entire area of the test tank, resulting in a device with no variation in test results. In addition, the above effect can be obtained by adding parts and man-hours in a range that does not lead to an increase in selling price.
It is also a very economical device.

[Brief description of drawings]

FIG. 1 is a sectional view of the entire double spray tower of the first embodiment of the present invention.

FIG. 2 is a detailed partial perspective view of a straightening cylinder fixed to a cylinder.

FIG. 3 is a sectional view of the entire double spray tower of the second embodiment.

FIG. 4 is a cross-sectional view of an example of the configuration of a conventional spray tower.

FIG. 5 shows a conventional spray tower arranged in the center of the test tank.
The principal part block diagram of an example of the salt spray tester where the ceiling part of a test tank has a gable roof shape.

6 is a configuration diagram of a main part of a side surface of FIG.

FIG. 7 is a diagram showing a spray amount sampling position of the salt spray tester shown in FIGS. 5 and 6;

FIG. 8 shows a conventional spray tower arranged in the center of the test tank.
The principal part block diagram of an example of the corrosion accelerating test machine whose cylindrical test tank and its ceiling part are hemispherical.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Double spray tower 2 Straightening cylinder 3 Notch hole 4 Sprayer 5 Liquid nozzle tube 6 Air nozzle tube 8 Cylinder 17 Spray tower 18 Salt water spray tester 19 Solution reservoir 20 Air circulation hole 29 Directional body

Claims (2)

[Claims] 1. A spray tower for arranging a corrosive solution in a test tank of a corrosion accelerating tester having a gabled roof shape, the cylinder being upright and connected to the bottom of the cylinder. Solution reservoir for storing the corrosive solution, a plurality of air circulation holes provided in the lower periphery of the cylinder, a liquid nozzle tube connected to the solution reservoir and a connected end to a pressurized air supply part, and the end portion is bent at a right angle. And the nozzle nozzles for air are integrally combined so that their tips are close to each other, and the tips of the nozzle nozzles for air face vertically upward and the tips of both nozzle tubes are located on the central axis of the cylinder. As described above, the atomizer fixed at a position below the cylinder in the vicinity of and above the air flow hole or at the position of the air flow hole, and the top of the trumpet cone faces downward, and is fixed so as to be vertically movable above the cylinder. Of particle size of fine particles generated from And a direction body for changing the spray direction of the fine particles, in a small diameter and smaller than the cylinder, in two planes of interest about a vertical plane passing through the central axis of the small cylinder Remove the upper part and make it a pentagonal shape where the upper part is an isosceles triangle when viewed from the front, and provide a rectifying cylinder with a notch hole or a long hole at its side periphery at the lower end, and use this rectifying cylinder for the liquid of the sprayer The nozzle tube and the nozzle tube for air are arranged at positions where they are loosely fitted in the cutout holes or the elongated holes, and the central axis of the straightening cylinder is aligned with the central axis of the cylinder, and the vertical and horizontal positions are adjusted. A double spray tower characterized in that the spray distribution is fixed in the test tank so that the spray distribution is uniform in the test tank. 2. The cutout hole or the long hole is not opened in the flow straightening cylinder, the total length thereof is shortened, and the straightening cylinder is arranged at an upper position close to the liquid nozzle tube of the sprayer. 1. The double spray tower according to 1.