Spray rotator

Abstract

[Problem] To provide a spray rotator which can evenly clean the inside of a tank and which can be easily attached to any tank. [Solution] This spray rotator disposed inside a tank for cleaning the inside of the tank is provided with a plurality of cleaning injection holes formed in a rotator body that rotates. A part or all of the plurality of cleaning injection holes have different injection angles in an elevation angle direction. Furthermore, in a plane centered on a rotation axis, the cleaning injection holes are drilled in a side wall of the rotator body in a manner as to be inclined in a prescribed rotation angle direction with respect to a straight line orthogonal to the rotation axis. When cleaning is performed while rotating the spray rotator body, a plurality of water columns injected from the respective cleaning injection holes are sprinkled in an elevation angle direction of the upper hemisphere inside the tank.

Description

Spray Rotor

[0001] The present invention relates to a spray rotor for tank cleaning, which cleans the inner wall surface of a tank.

[0002] Sanitary tanks and other tanks have traditionally been used in the food and pharmaceutical industries for a variety of purposes, including product storage, compounding, and sterilization. Because the interiors of these tanks must be kept clean, spray rotors are used as dedicated cleaning devices.

[0003] Specifically, as shown in Fig. 12, the spray rotor is inserted into the tank 102 through a nozzle 102b formed on the top lid 102a of the tank 102. For example, as shown in Fig. 13, the spray rotor 104 includes an upper rotor 106 and a lower rotor 108 that rotate in opposite directions. Each of the upper rotor 106 and the lower rotor 108 is provided with two rotation injection holes 110 and two cleaning injection holes 112. The rotation injection holes 110 are injection holes that inject cleaning liquid in a tangential direction to rotate the upper rotor 106 or the lower rotor 108, and the cleaning injection holes 112 are injection holes that inject cleaning liquid.

[0004] This spray rotor 104 makes it possible to clean the inside of the tank 102 without taking up much space. However, the above-mentioned spray rotor 104 has the problem that, although it cleans the areas in the tank 102 that are hit by the water column sprayed from the cleaning injection holes 112, it does not directly clean the areas that are not hit by the water column. For this reason, cleaning of the areas that are not hit by the water column has had to be left to the flow of cleaning liquid that flows down from the areas that the water column hits.

[0005] Furthermore, since there are only four cleaning injection holes 112 in total, there are few areas that can be cleaned with the water column, which causes uneven cleaning. In particular, there is a problem that it is difficult to clean the inside of the nozzle 102c.

[0006] In order to solve this problem, a spray rotor was developed in which a first group of injection holes and a second group of injection holes with different injection angles were formed adjacent to each other on the upper and lower rotors (see, for example, Patent Document 1).

[0007] Japanese Patent Application Laid-Open No. 2020-157214

[0008] However, the spray rotor 114 (hereinafter referred to as the conventional product) described in Patent Document 1 and shown in Figure 14 exhibits high cleaning performance at spray angles of approximately 15° to 45° when cleaning is performed, but at other spray angles, particularly at lower angles (see reference numeral 136 in Figure 14), cleaning still has to be relied on by the flow of water.

[0009] In particular, in large cleaning tanks, the nozzles are often located in areas where the jets are unlikely to hit directly, which can lead to incomplete cleaning. When this occurs, a large amount of cleaning liquid is required to prevent incomplete cleaning by performing cleaning for a long period of time, but there is a need to conserve cleaning liquid.

[0010] An object of the present invention is to provide a spray rotor that can clean the inside of a tank evenly in a short time and save cleaning liquid.

[0011] The spray rotor of the present invention is a spray rotor that is placed within a tank and is used to clean the inside of the tank, and is provided with a plurality of cleaning jet holes formed in a rotating rotor body, some or all of the plurality of cleaning jet holes have different jet angles in the elevation angle direction, and the cleaning jet holes are further drilled into the side wall of the rotor body in a plane centered on the rotation axis, at an angle inclined at a predetermined angle in the rotation direction with respect to a straight line perpendicular to the rotation axis, and when cleaning is performed while the spray rotor is rotated, a plurality of water columns are sprayed from each cleaning jet hole and sprayed in the elevation angle direction of the northern hemisphere within the tank.

[0012] In this way, by making the cleaning jet holes have different jetting angles in the elevation angle direction, the inside of the tank can be cleaned evenly in a short time and cleaning liquid can be saved.

[0013] Furthermore, the spray rotor of the present invention is characterized in that the cleaning injection holes include a plurality of high-angle injection holes for injecting a water column into a high-angle region, a plurality of medium-angle injection holes for injecting a water column into a medium-angle region, and a plurality of low-angle injection holes for injecting a water column into a low-angle region, and the angle formed by the water column injected from the high-angle injection holes is greater than 60° and less than 85°, the angle formed by the water column injected from the medium-angle injection holes is greater than 30° and less than 60°, and the angle formed by the water column injected from the low-angle injection holes is greater than 0° and less than 30°, based on the equator which is perpendicular to the rotation axis of the rotor main body.

[0014] By forming high-angle, medium-angle, and low-angle injection holes in the rotor body, it is possible to clean a wide area of ​​the tank's inner wall surface, which allows the tank to be cleaned evenly in a short amount of time and saves on cleaning fluid.

[0015] The spray rotor of the present invention is characterized in that a plurality of injection hole regions are arranged on the side wall of the rotor main body, with injection hole groups formed in rows in a direction perpendicular to the rotation direction of the rotor main body, the injection hole regions include a high-angle injection hole region for injecting a water column into a high-angle region, a medium-angle injection hole region for injecting a water column into a medium-angle region, and a low-angle injection hole region for injecting a water column into a low-angle region, and the angles of the water columns injected from each injection hole group included in each of the injection hole regions are different.

[0016] By forming high-angle, medium-angle, and low-angle nozzle areas on the rotor body, it is possible to clean a wide area of ​​the tank's inner wall surface, which allows the tank to be cleaned evenly in a short amount of time and saves on cleaning fluid.

[0017] Further, in the spray rotor of the present invention, the high-angle injection hole region includes a high-angle injection hole group composed of a plurality of the cleaning injection holes, and the angle between the water column sprayed from the cleaning injection hole closest to the equator of the high-angle injection hole group and the equator is 50° or more, and the angle between the water column sprayed from the cleaning injection hole closest to the pole of the high-angle injection hole group and the equator is 85° or less; the medium-angle injection hole region includes a medium-angle injection hole group composed of a plurality of the cleaning injection holes, and the angle between the water column sprayed from the cleaning injection hole closest to the equator of the medium-angle injection hole group and the equator is 10° or more, and the angle between the water column sprayed from the cleaning injection hole closest to the pole of the medium-angle injection hole group and the equator is 55° or less; and the low-angle injection hole region includes a low-angle injection hole group composed of a plurality of cleaning injection holes, The angle between the equator and the low-angle water column sprayed from the cleaning jet hole closest to the equator in the group of low-angle injection holes is 0° or more, and the angle between the equator and the water column sprayed from the cleaning jet hole closest to the pole in the group of low-angle injection holes is 30° or less.

[0018] In this way, by setting the range of angles formed by the water columns sprayed from the cleaning nozzles, it is possible to accurately form high-angle nozzle areas, medium-angle nozzle areas, and low-angle nozzle areas.

[0019] The spray rotor of the present invention is characterized in that each of the groups of injection holes includes 2 to 10 of the cleaning injection holes.

[0020] That is, by including the above-mentioned number of cleaning injection holes in each injection hole group, it is possible to clean a wide range of the inner wall surface of the tank.

[0021] Furthermore, the spray rotor of the present invention is characterized in that the rotor main body comprises an upper rotor having high-angle injection holes, medium-angle injection holes, and low-angle injection holes, or a high-angle injection hole region, a medium-angle injection hole region, and a low-angle injection hole region, and a lower rotor that rotates in the forward and reverse directions relative to the upper rotor, and the upper rotor and the lower rotor are configured to be spherical.

[0022] In this way, the rotation speed of the upper rotor can be controlled, allowing the area inside the tank to be cleaned accurately. Also, by making the spray rotor spherical, the angle of the water column sprayed from the cleaning nozzle can be adjusted to an appropriate angle in the direction of elevation, allowing the tank inner wall surface to be cleaned over a wide area.

[0023] According to the present invention, it is possible to provide a spray rotor that can clean the inside of a tank evenly in a short time and save cleaning liquid.

[0024] 3A and 3B are perspective views of a spray rotor according to an embodiment as viewed from above; a view of a spray rotor according to an embodiment as viewed from the front; a cross-sectional view showing a plane cut at a predetermined height of an upper rotor according to an embodiment as viewed from above; a cross-sectional view of a first injection hole group cut along line A-A in the upper rotor according to an embodiment, and a cross-sectional view of a second injection hole group cut along line B-B in the upper rotor according to an embodiment; a cross-sectional view of a third injection hole group cut along line C-C in the upper rotor according to an embodiment, and a cross-sectional view of a fourth injection hole group cut along line D-D in the upper rotor according to an embodiment; a cross-sectional view of a fifth injection hole group cut along line E-E in the upper rotor according to an embodiment, and a cross-sectional view of a sixth injection hole group cut along line F-F in the upper rotor according to an embodiment; a cross-sectional view showing a plane cut at a predetermined height of a lower rotor according to an embodiment as viewed from above; a view showing a state in which a water column sprayed from each injection hole group in the entire injection hole region formed on the upper rotor according to an embodiment hits the inner wall surface of a tank. Fig. 1 is a bar graph showing the cleaning rates of the inside of the tank and the inside of the nozzle by the implemented product and the cleaning rates of the inside of the tank and the inside of the nozzle by the conventional product. Fig. 2 is a bar graph showing the cleaning efficiency of the inside of the tank and the inside of the nozzle by the implemented product and the cleaning efficiency of the inside of the tank and the inside of the nozzle by the conventional product. Fig. 3 is a front view of a spray rotor according to another embodiment. Fig. 4 is a diagram showing a situation in which the inside of a tank is cleaned using a conventional spray rotor. Fig. 4 is a front view of a conventional spray rotor. Fig. 5 is a diagram showing a situation in which the inside of a cleaning tank is cleaned using a conventional product.

[0025]

[0023] Hereinafter, with reference to the drawings, a spray rotating body according to an embodiment of the present invention will be described, taking as an example a case in which the spray rotating body is spherical. Fig. 1 is a perspective view of the spray rotating body according to the embodiment as viewed from above, and Fig. 2 is a view of the same as viewed from the front. As shown in Figs. 1 and 2, the spray rotating body 2 is formed of a resin such as polytetrafluoroethylene (PTFE), and includes a nozzle portion 4, a fixing ring 6, and a ball main body 8 (rotating body main body).

[0026] The outer diameter of the spray rotor 2 is preferably about 62 mm to 67 mm when it is attached to a nozzle 35 having an inner diameter of 80 mm formed in a tank 34 (see FIG. 8). In this specification, "upper" and "lower" are defined as being in the states shown in FIGS.

[0027] The nozzle portion 4 has a cylindrical shape with a flow path 4a for the cleaning liquid formed inside, and a large-diameter portion 4b with an increased diameter formed at the bottom end. A thread groove (not shown) is formed on the outer periphery of the portion of the nozzle portion 4 where the fixing ring 6 is attached. Furthermore, a port (not shown) is formed in a portion of the nozzle portion 4 hidden by the ball body 8, through which the cleaning liquid sprayed from the spray hole group 12 (described later) passes.

[0028] The fixing ring 6 has a threaded groove (not shown) formed on its inner peripheral surface, and is attached to a predetermined position by screwing.

[0029] The ball main body 8 is a spherical rotating body having an axis on the rotation center line L and having a through-hole (not shown) formed therein for passing the nozzle portion 4 therethrough, and includes an upper rotating body 8a and a lower rotating body 8b. Here, the lower rotating body 8b can rotate in the opposite direction to the upper rotating body 8a, and there may be a gap between the upper rotating body 8a and the lower rotating body 8b, or the upper rotating body 8a and the lower rotating body 8b may be in contact with each other.

[0030] This ball body 8 is first rotatably fixed in a predetermined position by passing the lower rotating body 8b through the nozzle portion 4 and allowing it to land on the large diameter portion 4b, then passing the upper rotating body 8a through the nozzle portion 4 and abutting it against the lower rotating body 8b, and finally attaching the fixing ring 6 to the nozzle portion 4.

[0031] Three types of injection hole areas 10 are formed on the curved surface of the upper rotating body 8a: a high-angle injection hole area 10a for injecting a water column of cleaning liquid into a high-angle area of ​​the tank 34 (see Figure 8), a medium-angle injection hole area 10b for injecting a water column of cleaning liquid into a medium-angle area, and a low-angle injection hole area 10c for injecting a water column of cleaning liquid into a low-angle area.

[0032] The injection hole region 10 includes a plurality of injection hole groups 12 arranged in a row in a direction perpendicular to the rotation direction of the ball body 8, i.e., in the direction of the rotation center line L. That is, each injection hole region 10 is provided with two injection hole groups 12 each including a plurality of cleaning injection holes 8e that inject cleaning liquid, and each injection hole group 12 is arranged symmetrically with respect to the rotation center line L of the ball body 8 (see FIG. 3).

[0033] The high-angle injection hole region 10a includes a first injection hole group 12a and a second injection hole group 12b as high-angle injection hole groups, the medium-angle injection hole region 10b includes a third injection hole group 12c and a fourth injection hole group 12d as medium-angle injection hole groups, and the low-angle injection hole region 10c includes a fifth injection hole group 12e and a sixth injection hole group 12f as low-angle injection hole groups.

[0034] In addition, three cleaning injection holes 8e are drilled in each of the first injection hole group 12a and the second injection hole group 12b, and four cleaning injection holes 8e are drilled in each of the third injection hole group 12c, the fourth injection hole group 12d, the fifth injection hole group 12e, and the sixth injection hole group 12f.

[0035] The number of cleaning injection holes 8e included in each injection hole group 12 is not necessarily limited to the above-mentioned number, and the number of cleaning injection holes 8e included in the first injection hole group 12a to the sixth injection hole group 12f may be in the range of 2 to 10. The outer diameter of the cleaning injection holes 8e is preferably in the range of 1.0 mm to 1.8 mm, and more preferably in the range of 1.2 mm to 1.5 mm.

[0036] 3 is a cross-sectional view showing the upper rotor 8a cut at a predetermined height as viewed from above. As shown in FIG. 3, each of the cleaning nozzles 8e constituting the nozzle group 12 is drilled in the side wall of the rotor body at a predetermined angle θ1 in the rotational direction relative to a line X perpendicular to the rotational center line L in a plane centered on the rotational center line L. Here, the angle θ1 is 5 to 25 degrees. This facilitates rotation of the upper rotor 8a.

[0037] 4 to 6 are cross-sectional views of each injection hole group 12 drilled in the upper rotor 8a. As shown in Figures 4 to 6, each injection hole group 12 is formed symmetrically on both side walls at two locations with respect to the rotation center line L, and the angle of the water column injected from each injection hole group 12 included in each injection hole region 10 is different.

[0038] Here, Figure 4(a) shows a cross section of the first injection hole group 12a (cross section taken along line A-A in Figure 3), Figure 4(b) shows a cross section of the second injection hole group 12b (cross section taken along line B-B in Figure 3), Figure 5(a) shows a cross section of the third injection hole group 12c (cross section taken along line C-C in Figure 3), Figure 5(b) shows a cross section of the fourth injection hole group 12d (cross section taken along line D-D in Figure 3), Figure 6(a) shows a cross section of the fifth injection hole group 12e (cross section taken along line E-E in Figure 3), and Figure 6(b) shows a cross section of the sixth injection hole group 12f (cross section taken along line F-F in Figure 3).

[0039] 4(a), in the first injection hole group 12a forming the high-angle injection hole region 10a for injecting a water column of cleaning liquid into the high-angle region, the angle α1 formed between the first water column 14a injected from the polar-most cleaning injection hole 8e and the equator 16 is in the range of 60° to 80°, and the angle β1 formed between the first water column 14a' injected from the equatorial-most cleaning injection hole 8e and the equator 16 is in the range of 50° to 70°. The angle γ1 formed between the first water column 14a and the first water column 14a' is in the range of 10° to 30°.

[0040] 4(b), in the second injection hole group 12b forming the high-angle injection hole region 10a for injecting a water column of cleaning liquid into the high-angle region, the angle α2 formed by the second water column 14b injected from the polar-most cleaning injection hole 8e and the equator 16 is in the range of 65° to 85°, and the angle β2 formed by the second water column 14b' injected from the equatorial-most cleaning injection hole 8e and the equator 16 is in the range of 55° to 75°. The angle γ2 formed by the second water column 14b and the second water column 14b' is in the range of 10° to 30°.

[0041] That is, the angle between the water column sprayed from the cleaning injection hole 8e closest to the equator in the group of high-angle injection holes and the equator is 50° or more, and the angle between the water column sprayed from the cleaning injection hole 8e closest to the pole in the group of high-angle injection holes and the equator is 85° or less.

[0042] 5(a), in the third injection hole group 12c that forms the medium-angle injection hole region 10b for injecting a water column of cleaning liquid into the medium-angle region, the angle α3 between the third water column 14c injected from the polar-most cleaning injection hole 8e and the equator 16 is in the range of 25° to 50°, and the angle β3 between the third water column 14c' injected from the equatorial-most cleaning injection hole 8e and the equator 16 is in the range of 10° to 35°. The angle γ3 between the third water column 14c and the third water column 14c' is in the range of 15° to 40°.

[0043] 5(b), in the fourth injection hole group 12d that forms the medium-angle injection hole region 10b for injecting a water column of cleaning liquid into the medium-angle region, the angle α4 between the fourth water column 14d injected from the polar-most cleaning injection hole 8e and the equator 16 is in the range of 30° to 55°, and the angle β4 between the fourth water column 14d' injected from the equatorial-most cleaning injection hole 8e is in the range of 10° to 45°. Also, the angle γ4 between the fourth water column 14d and the fourth water column 14d' is in the range of 10° to 45°.

[0044] In other words, the angle between the water column sprayed from the cleaning injection hole 8e closest to the equator in the group of medium-angle injection holes and the equator is in the range of 10° or more, and the angle between the water column sprayed from the cleaning injection hole 8e closest to the pole in the group of medium-angle injection holes and the equator is in the range of 55° or less.

[0045] 6(a), in the fifth injection hole group 12e that forms the low-angle injection hole region 10c for injecting a water column of cleaning liquid into the low-angle region, the angle α5 between the fifth water column 14e injected from the polar-most cleaning injection hole 8e and the equator 16 is in the range of 10° to 25°, and the angle β5 between the fifth water column 14e' injected from the equatorial-most cleaning injection hole 8e and the equator 16 is in the range of 0° to 15°. The angle γ5 between the fifth water column 14e and the fifth water column 14e' is in the range of 10° to 25°.

[0046] 6(b), in the sixth injection hole group 12f that forms the low-angle injection hole region 10c for injecting a water column of cleaning liquid into the low-angle region, the angle α6 formed by the sixth water column 14f injected from the polar-most cleaning injection hole 8e and the equator 16 is in the range of 10° to 30°, and the angle β6 formed by the sixth water column 14f' injected from the equatorial-most cleaning injection hole 8e and the equator 16 is in the range of 0° to 20°. The angle γ6 formed by the sixth water column 14f and the sixth water column 14f' is in the range of 10° to 30°.

[0047] That is, the angle between the equator and the low-angle water plume sprayed from the cleaning jet hole 8e closest to the equator in the group of low-angle injection holes is 0° or more, and the angle between the equator and the fifth water plume sprayed from the cleaning jet hole 8e closest to the pole in the group of low-angle injection holes is 30° or less. The rotation speed of the upper rotor 8a is 5 rpm or more and 60 rpm or less, and because it rotates slowly, the inside of the tank 34 (see Figure 8) can be thoroughly cleaned.

[0048] FIG. 7 is a cross-sectional view of the lower rotor 8b cut at a predetermined height, viewed from above. As shown in FIG. 7 , two rotation injection holes 8x, which inject cleaning fluid in a tangential direction to rotate the lower rotor 8b, and two cleaning injection holes 8y, which inject cleaning fluid, are drilled in the curved surface of the lower rotor 8b. The rotation injection holes 8x and cleaning injection holes 8y are drilled in the sidewall of the rotor body, tilted in the rotation direction by a predetermined angle θ2 with respect to a line X perpendicular to the rotation center line L. Here, the angle θ2 is 5° to 25°. The lower rotor 8b contacts the upper rotor 8a and rotates while sliding against the upper rotor 8a, thereby suppressing the rotation speed of the upper rotor 8a so that the upper rotor 8a rotates slowly.

[0049] In this spray rotor 2, the cleaning liquid supplied from the flow path 4a of the nozzle portion 4 is filled into the upper rotor 8a and the lower rotor 8b via a port (not shown) in the bowl body 8, and is sprayed from each of the cleaning jet holes 8e, thereby promoting the rotation of the upper rotor 8a, while the cleaning liquid is sprayed tangentially from the rotation jet holes 8x of the lower rotor 8b, causing the lower rotor 8b to rotate in the opposite direction to the upper rotor 8a, thereby suppressing the rotational speed of the upper rotor 8a. Then, the cleaning liquid is sprayed from each of the cleaning jet holes 8e toward the part to be cleaned (for example, the inner wall surface of the tank 34).

[0050] Figure 8 is a diagram showing the state in which the water column sprayed from each of the injection hole groups 12 in the entire injection hole region 10 formed in the upper rotor 8a hits the inner wall surface of the tank 34. As shown in Figure 8, by forming the high-angle injection hole region 10a, the medium-angle injection hole region 10b, and the low-angle injection hole region 10c in the upper rotor 8a, it is possible to spray the water column not only to the medium-angle region 36b in the tank 34, but also to the high-angle region 36a and the low-angle region 36c. Furthermore, because the angles of the water column sprayed from the injection hole groups 12 included in each injection hole region 10 are different, it is possible to clean a wide area of ​​the inner wall surface of the tank 34.

[0051] [Example 1] Next, a cleaning rate experiment using the spray rotor 2 according to the embodiment (embodiment) and the spray rotor 114 (conventional product) described in Patent Document 1 will be described. First, in the experiment, a tank equipped with the embodiment and a tank equipped with the conventional product were prepared. The tanks used for each were identical. Both the embodiment and the conventional product were made of polytetrafluoroethylene (PTFE), with the outer diameter of the embodiment being 65 mm and the outer diameter of the conventional product being 70 mm. The tank was made of stainless steel, had an inner diameter of 1200 mm, and the ratio of the height of the northern hemisphere to the inner diameter was 2:1.

[0052] Next, a total of 13 stainless steel test plates coated with food coloring or the like as simulated soiling were prepared. Of the 13 test plates, eight were to be placed on the inner wall surface of the tank, and five were to be placed inside the nozzle of the tank. The weights of the eight test plates placed on the inner wall surface of the tank and the five test plates placed inside the nozzle were measured. Next, eight test plates were placed on the inner wall surface of both tanks, and five test plates were placed inside the nozzle. After cleaning each tank for a predetermined time using the working product and the conventional product, the test plates were removed and their weights were measured.

[0053] In the test, the flow rate of the experimental product was 70 (L / min) and the spray pressure of the cleaning water was 0.15 (Mpa), while the flow rate of the conventional product was 90 (L / min) and the spray pressure of the cleaning water was 0.15 (Mpa).

[0054] The formula for calculating the cleaning rate based on the weight of the test plate before and after cleaning is as follows: Cleaning rate = (weight of test plate before cleaning - weight of test plate after cleaning) / weight of test plate before cleaning (Formula 1)

[0055] FIG. 9( a) is a bar graph (the left shows the implemented product, and the right shows the conventional product; the same applies below) showing the cleaning rates inside the tank calculated using Equation 1 for the implemented product and the conventional product, and FIG. 9( b) is a bar graph showing the cleaning rates inside the nozzle calculated using Equation 1 for the implemented product and the conventional product.

[0056] Note that High_100A is a nozzle with an inner diameter of 100 mm located in high-angle region 36a, Medium_50A is a nozzle with an inner diameter of 50 mm located in medium-angle region 36b, and Low_100A is a nozzle with an inner diameter of 100 mm located in low-angle region 36c. Note that the embodied product and the conventional product are attached to nozzles 35 (see FIG. 8) with an inner diameter of 80 mm located in high-angle region 36a within tank 34.

[0057] 9(a) shows that the cleaning rate of the inside of the tank by the implemented product is higher in the high-angle and low-angle regions than that of the conventional product. Also, FIG. 9(b) shows that the cleaning rate of the inside of the tank nozzle by the implemented product is higher in the medium-angle and low-angle regions than that of the conventional product.

[0058] 10(a) and 10(b) show the cleaning efficiency of the implemented product and the conventional product. The formula for calculating the cleaning efficiency is as follows: Cleaning efficiency = cleaning rate / flow rate (Formula 2)

[0059] According to the spray rotor 2 of the embodiment, by forming the high-angle injection hole region 10a, the medium-angle injection hole region 10b, and the low-angle injection hole region 10c on the upper rotor 8a, it is possible to spray a water column not only into the medium-angle region 36b inside the tank 34, but also into the high-angle region 36a and the low-angle region 36c. Furthermore, because the angles of the water columns sprayed from the injection hole groups 12 included in each injection hole region 10 are different, it is possible to clean a wide area of ​​the tank inner wall surface. This allows the inside of the tank 34 to be cleaned evenly in a short time and saves cleaning liquid.

[0060] Furthermore, by forming the first injection hole group 12a and the second injection hole group 12b, which have different injection angles, adjacent to each other on the upper rotor 8a and the lower rotor 8b, it is possible to evenly clean the inside of the tank 34. Furthermore, there is no need to adjust the injection angle for each tank 34 to be cleaned, and the device can be easily attached to any tank 34.

[0061] In addition, since the spray rotor 2 has a two-stage structure with an upper rotor 8a and a lower rotor 8b, dirt in areas washed away by the cleaning liquid sprayed from the upper rotor 8a is further washed away by the cleaning liquid sprayed from the lower rotor 8b, allowing dirt inside the tank 34 to be thoroughly cleaned.

[0062] Furthermore, by making the spray rotor 2 spherical, the angle of the water column sprayed from the cleaning nozzle 8e can be adjusted to an appropriate angle of elevation, allowing the inner wall surface of the tank 34 to be cleaned over a wide area.

[0063] In the above embodiment, the spray rotor is the spray rotor 2 having the upper rotor 8 a and the lower rotor 8 b, but the spray rotor does not necessarily have to be spherical, and does not necessarily have to have the lower rotor 8 b. When the spray rotor 2 is not spherical, it may be, for example, frustum-shaped.

[0064] Furthermore, in the above embodiment, the case where the lower rotating body 8b rotates in the opposite direction to the upper rotating body 8a is illustrated, but the lower rotating body 8b may also rotate in the same forward direction as the upper rotating body 8a.

[0065] Furthermore, in the above-described embodiment, as long as the inside of the tank 34 can be cleaned evenly in a short time and cleaning fluid can be saved, the high-angle injection hole area 10a, the medium-angle injection hole area 10b, the low-angle injection hole area 10c, and each injection hole group do not necessarily have to be formed on the curved surface of the upper rotating body 8a.

[0066] In other words, it is sufficient that the side wall of the ball body 8 includes multiple nozzles with different spray angles in the elevation direction, and when cleaning is performed while rotating the spray rotor 2, multiple water columns sprayed from each cleaning nozzle 8e can be sprayed in the elevation direction of the northern hemisphere inside the tank 34.

[0067] Specifically, by configuring the cleaning injection holes 8e to include injection holes having different angles in the elevation direction, such as multiple high-angle injection holes for injecting a water column into a high-angle region, multiple medium-angle injection holes for injecting a water column into a medium-angle region, and multiple low-angle injection holes for injecting a water column into a low-angle region, the multiple water columns injected from each cleaning injection hole 8e are sprayed in the elevation direction of the northern hemisphere inside the tank 34, thereby achieving the function of cleaning a wide area of ​​the tank's inner wall surface.

[0068] For example, a high-angle injection hole is configured so that the angle of the ejected water column with respect to the equator is greater than 60° and less than 85°, a medium-angle injection hole is configured so that the angle of the ejected water column with respect to the equator is greater than 30° and less than 60°, and a low-angle injection hole is configured so that the angle of the ejected water column with respect to the equator is greater than 0° and less than 30°.

[0069] In this case, for example, even if the spray rotor 22 shown in Figure 11 does not have a group of injection holes 12 and the cleaning injection holes 8e are formed in a spiral on the curved surface of the ball body 8, by including high-angle injection holes, medium-angle injection holes, and low-angle injection holes in the cleaning injection holes 8e, it is possible to achieve the function of spraying multiple water columns from each cleaning injection hole 8e in the direction of the elevation angle of the northern hemisphere inside the tank 34.

[0070] Furthermore, in the above-described embodiment, the cleaning injection holes 8e arranged in the high-angle injection hole region 10a may include not only high-angle injection holes but also medium-angle injection holes and low-angle injection holes, the cleaning injection holes 8e arranged in the medium-angle injection hole region 10b may include not only medium-angle injection holes but also high-angle injection holes and low-angle injection holes, and the cleaning injection holes 8e arranged in the low-angle injection hole region 10c may include not only low-angle injection holes but also high-angle injection holes and medium-angle injection holes.

[0071] In the above-described embodiment, a plurality of cleaning injection holes 8e having the same injection angle in the elevation angle direction may be included in some of the spray rotors 2. In the above-described embodiment, the diameters of the cleaning injection holes 8e formed in the spray rotor 2 do not necessarily have to be the same.

[0072] DESCRIPTION OF SYMBOLS 2 Spray rotor 4 Nozzle portion 4a Flow path 4b Large diameter portion 6 Fixing ring 8 Ball body 8a Upper rotor 8b Lower rotor 8e Cleaning injection hole 8x Rotation injection hole 8y Cleaning injection hole 10 Injection hole region 10a High-angle injection hole region 10b Medium-angle injection hole region 10c Low-angle injection hole region 12 Injection hole group 12a First injection hole group 12b Second injection hole group 12c Third injection hole group 12d Fourth injection hole group 12e Fifth injection hole group 12f Sixth injection hole group 14a First water column 14b Second water column 14c Third water column 14d Fourth water column 14e Fifth water column 14f Sixth water column 16 Equator 22 Spray rotor 34 Tank 35 Nozzle 36a High-angle region 36b Medium angle region 36c Low angle region 102 Tank 102a Upper lid 102b Nozzle 102c Nozzle 104 Spray rotor 106 Upper rotor 108 Lower rotor 110 Rotation jet hole 112 Cleaning jet hole 114 Spray rotor 136 Area that must be cleaned by flowing water (area that is difficult for the water column to hit) L Rotation center line X Straight line perpendicular to L

Claims

1. A spray rotor for being placed within a tank and for cleaning the inside of the tank, comprising a plurality of cleaning jet holes formed in a rotating rotor body, some or all of the plurality of cleaning jet holes having different jet angles in the elevation angle direction, and the cleaning jet holes are further drilled in the side wall of the rotor body at a predetermined angle inclined in the rotational direction with respect to a straight line perpendicular to the rotation axis in a plane centered on the rotation axis, and when cleaning is performed while the spray rotor is rotated, a plurality of water columns sprayed from each cleaning jet hole are sprayed in the elevation angle direction of the northern hemisphere inside the tank.

2. The spray rotor described in claim 1, characterized in that the cleaning injection holes include a plurality of high-angle injection holes for injecting a water column into a high-angle region, a plurality of medium-angle injection holes for injecting a water column into a medium-angle region, and a plurality of low-angle injection holes for injecting a water column into a low-angle region, and the angle subtended by the water column sprayed from the high-angle injection holes is greater than 60° and less than 85°, the angle subtended by the water column sprayed from the medium-angle injection holes is greater than 30° and less than 60°, and the angle subtended by the water column sprayed from the low-angle injection holes is greater than 0° and less than 30°, based on the equator perpendicular to the rotation axis of the rotor main body.

3. A spray rotor as described in claim 1, wherein a plurality of injection hole areas are arranged on a side wall of the rotor main body, in which injection hole groups are formed in a row in a direction perpendicular to the rotation direction of the rotor main body, and the injection hole areas include a high-angle injection hole area for injecting a water column into a high-angle area, a medium-angle injection hole area for injecting a water column into a medium-angle area, and a low-angle injection hole area for injecting a water column into a low-angle area, and the angles of the water column sprayed from each injection hole group included in each of the injection hole areas are different.

4. The high-angle injection hole region includes a high-angle injection hole group composed of a plurality of the cleaning injection holes, and the angle between the water column sprayed from the cleaning injection hole on the equatorial side of the high-angle injection hole group and the equator is 50° or more, and the angle between the water column sprayed from the cleaning injection hole on the polar side of the high-angle injection hole group and the equator is 85° or less; the medium-angle injection hole region includes a medium-angle injection hole group composed of a plurality of the cleaning injection holes, and the angle between the water column sprayed from the cleaning injection hole on the equatorial side of the medium-angle injection hole group and the equator is 10° or more, and the angle between the water column sprayed from the cleaning injection hole on the polar side of the medium-angle injection hole group and the equator is 55° or less; and the low-angle injection hole region includes a low-angle injection hole group composed of a plurality of cleaning injection holes, 4. A spray rotor as described in claim 3, characterized in that the angle between the equator and the low-angle water column sprayed from the cleaning jet hole on the equatorial side of the low-angle injection hole group is 0° or more, and the angle between the equator and the water column sprayed from the cleaning jet hole on the polar side of the low-angle injection hole group is 30° or less.

5. A spray rotor according to claim 3, wherein each of said groups of injection holes includes 2 to 10 of said cleaning injection holes.

6. The spray rotor described in claim 1, characterized in that the rotor main body comprises an upper rotor having high-angle injection holes, medium-angle injection holes, and low-angle injection holes, or a region of high-angle injection holes, medium-angle injection holes, and low-angle injection holes, and a lower rotor that rotates in the forward and reverse directions with the upper rotor, and the upper rotor and lower rotor are spherically configured.

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