JP2011196893A - Mist atomizer for atomizing test - Google Patents

Abstract

PROBLEM TO BE SOLVED: To simplify the constitution of a mist atomizer used in an atomizing test and to enhance not only the user's convenience of the mist atomizer but also the atomizing capacity of the mist atomizer.SOLUTION: In the mist atomizer used in the atomizing test, a casing serving as the body of the mist atomizer is provided, an air passage for guiding compressed air into the casing is provided, a jet orifice is provided in the downstream end of the air passage of the casing, the liquid pipe mounted in the casing is provided so as to be directed to the jet orifice, an air flow channel is formed between the inner peripheral surface on the downstream side of the air passage and the outer peripheral surface of the liquid pipe, the liquid nozzle of the outlet region of the liquid pipe is surrounded by the air flow channel and a guide groove means for rectifying air in the air flow channel are provided in the inner peripheral surface on the downstream side of the air passage and the outer peripheral surface of the liquid pipe.

Description

  The present invention relates to a mistizer used for a spray test, and in particular, simplifies the structure of the mistmizer, improves usability such as adjustment of the mistmizer, rectifies the spray of the mistmizer, and improves the straightness and spray performance. This is related to a mistomizer that also improves

The mistizer has a function of spraying a liquid in the form of a mist, and is used, for example, in a salt spray test.
Some of the mistizers utilize the Venturi effect, which is one of the effects of hydrodynamics.
This Venturi effect refers to a phenomenon in which the flow velocity is increased by narrowing the cross-sectional area of the fluid flow, and a low pressure portion is created. It is derived from Bernoulli's theorem when the flow rate is constant.
The venturi effect is applied not only to the mistizer described above but also to a venturi for measuring a flow rate, a carburetor of a vehicle engine, and the like.

Japanese Patent Laid-Open No. 2002-224592 JP 2003-175344 A JP 2008-76051 A JP 2009-279548 A JIS Z 2371

By the way, as shown in FIG. 5, a conventional mistomizer includes an air nozzle 101 that ejects compressed air and a liquid nozzle 102 of a liquid pipe arranged in a state of being orthogonal to each other.
In this case, the spray center C of the air nozzle 101 is affected by the liquid nozzle 102, and the spray center C of the air nozzle 101 is inclined toward the liquid nozzle 102 as shown in FIG. This is inconvenient because it is not easy to use and takes time when adjusting the distribution of the amount of spray collected.
Further, in the configuration in which the air nozzle 101 and the liquid nozzle 102 are arranged in an orthogonal state, the spray amount and the spray direction are determined by the relative positions of the air nozzle 101 and the liquid nozzle 102. In order to improve the performance, there is an inconvenience that a very difficult mounting operation with a small dimensional accuracy is required.
Furthermore, since the air nozzle 101 and the liquid nozzle 102 are generally formed of a glass material, the ejection performance from the air nozzle 101 and the liquid nozzle 102 depends on the skill of the glass processing engineer. There is an inconvenience that mass production of the air nozzle 101 and the liquid nozzle 102 is difficult.

  Further, in the nozzles disclosed in Patent Document 1 and Patent Document 2, rotation is applied to the flow of air flowing from the upstream side to the downstream side, and the spray becomes a rotational flow.

  In the spray test disclosed in Non-Patent Document 1, it is described that spraying is based on free fall in principle. However, when spraying is a rotating flow, spraying is free falling even when a spray tower or the like is used. There is an inconvenience of not.

  Further, when the spray is a rotating flow, a turbulent state occurs in the test tank, and there is a disadvantage that the spray does not reach the entire test tank of the spray tester.

Moreover, the nozzles disclosed in Patent Document 1 and Patent Document 2 have a structure in which liquid accumulates on the casing near the jet outlet when used in an upward or lateral direction for use in a spray test.
As a result, the liquid collected in the vicinity of the jet outlet will be blown up again, so that the liquid blown up again will be mixed into the spray coming out of the liquid nozzle of the mistomizer, causing variations in the spray distribution and reproducing the spray test. There is an inconvenience that the sex gets worse.

Furthermore, in the conventional mistomizer disclosed in Patent Document 3, there is a type in which an air pipe joins obliquely forward from a midway portion of a liquid pipe to spray a liquid.
However, since the air pipes merge obliquely forward from the middle part of the liquid pipe, there is a disadvantage that the air flow is not uniform and uniform liquid spraying cannot be performed.

Furthermore, in order to eliminate the accumulation of liquid in the vicinity of the jet outlet, a measure of cutting the end face of the jet outlet so as to be inclined inward is also conceivable.
However, if the end face of the jet outlet is cut so as to be inclined inward, excessive spraying diffuses when liquid is sprayed from the jet outlet, and an improvement has been desired.

  The object of the present invention is to simplify the structure of the mistomizer, improve the usability of the mistmizer, rectify the spray of the mistmizer, improve the straightness, and improve the spray performance.

Accordingly, in order to eliminate the above-described disadvantages, the present invention provides a casing that is a main body of the mistomizer in a mistmizer used in a spray test, and an air passage that guides compressed air in the casing. And a liquid pipe mounted on the casing so as to be directed to the jet outlet, and an air between the inner peripheral surface on the downstream side of the air path and the outer peripheral surface of the liquid pipe. A flow channel is exposed, and the air flow channel surrounds the liquid nozzle at the outlet portion of the liquid tube, and the inner peripheral surface on the downstream side of the air passage and the outer peripheral surface of the liquid tube Guide groove means for rectifying the air is provided.
The guide groove means has a first groove formed on the inner peripheral surface on the downstream side of the air passage so as to be directed from the upstream side to the downstream side, and is directed on the outer peripheral surface of the liquid pipe from the upstream side to the downstream side. And a second groove portion formed as described above.
Further, the spout formed on the upper surface of the casing includes a draining portion with a downstream end protruding upward, and the draining portion has a draining height with a downstream end protruding upward. In addition, the protruding portion has a draining width in which the diameter is gradually reduced from the collar portion toward the top portion.

  As described above in detail, according to the present invention, in the spray test mistizer, the casing that is the main body of the mistomizer is provided, the air passage that guides the compressed air is provided in the casing, and the air passage downstream of the casing is provided. An air outlet is provided, a liquid pipe attached to the casing is directed to the outlet, and an air flow path appears between the inner peripheral surface on the downstream side of the air passage and the outer peripheral surface of the liquid pipe. Thus, a guide groove means for rectifying air in the air flow path is provided on the inner peripheral surface on the downstream side of the air passage and the outer peripheral surface of the liquid tube.

Therefore, the configuration of the mistomizer can be simplified, the mistmizer can be easily manufactured and the cost can be reduced, which is economically advantageous.
In addition, with the simplification of the mist-mizer configuration, it is possible to easily adjust the spray amount of the mist-mizer with a simple adjustment operation by moving the liquid nozzle up and down without requiring skill. Can improve the usability.

  Further, the configuration in which the liquid nozzle at the outlet portion of the liquid pipe is surrounded by the air flow path of the mistomizer, the compressed air flows so as to wrap around the center of the liquid nozzle, and the flow of the spray is coaxial with the liquid nozzle. By increasing the straightness of the spray with a center, it is possible to improve the spray performance of the mistomizer, and more uniform spraying is possible.For example, when performing a spray test, the stability of the spray test is improved. Can be increased.

  Furthermore, the air in the air channel can be rectified by the guide groove means provided on the inner peripheral surface on the downstream side of the air passage and the outer peripheral surface of the liquid pipe, and the test of the spray tester in the spray test The spray collection amount distribution in the tank can be made more uniform.

  Then, the spray of the mist-mizer becomes rectified and the straightness is improved, so that the spray can move in the test tank and freely fall on the sample piece in the spray test.

FIG. 1 is an enlarged assembly perspective view with a partially cutaway guide groove means of a mistomizer. (Example) FIG. 2 is a schematic cross-sectional view of a mistomizer. (Example) FIG. 3 is an enlarged cross-sectional view of the main part of the air flow path portion of the mistomizer. (Example) FIG. 4 is a schematic explanatory view showing a state in which a mistizer showing a second embodiment of the present invention is installed in a spray tower during a spray test by a spray tester. (Example) FIG. 5 is a schematic explanatory view of a mistizer in which an air nozzle for ejecting compressed air and a liquid nozzle of a liquid pipe are arranged orthogonal to each other, showing the prior art of the present invention.

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

1 to 3 show the structure of a mistomizer according to the present invention.
In FIG. 2, 1 is a mistomizer.
This mistizer 1 sprays a liquid using a venturi effect.
At this time, the mist-mizer 1 is provided with a casing 2 that is a main body of the mist-mizer 1, an air passage 3 that guides compressed air is provided in the casing 2, and is injected into the downstream end of the air passage 3 of the casing 2. An outlet 4 is provided.
Further, a liquid pipe 5 attached to the casing 2 is provided so as to be directed to the jet outlet 4, and an air flow path is provided between the inner peripheral surface 3 b on the downstream side of the air passage 3 and the outer peripheral surface 5 a of the liquid pipe 5. 6 is made to appear, and the air flow path 6 surrounds the liquid nozzle 7 at the outlet portion of the liquid pipe 5.

More specifically, as shown in FIG. 2, the mistizer 1 has the casing 2 formed of a material such as metal or synthetic resin.
And the air path 3 which guides the compressed air inside this casing 2 is formed.
The air passage 3 forms an air inlet 9 as an upstream end portion on the left side portion of the casing 2 in FIG. 2, and forms the jet outlet 4 as a downstream end portion on the upper surface 2t of the casing 2 in FIG. is doing.
At this time, as shown in FIGS. 2 and 3, the air passage 3 includes a first air passage 3-1 connected to the air inlet 9, a downstream end of the first air passage 3-1, and the jet outlet 4. A second air passage 3-2 having a large volume functioning as an expansion chamber that expands below, and an inverse taper in which the opening diameter gradually decreases toward the jet port 4 at the upper portion of the second air passage 3-2. A third air passage 3-3 having a shape, and a fourth air passage 3 having a smaller diameter and a uniform diameter than the first air passage 3-1 from the third air passage 3-3 and communicating with the jet port 4. -4.

Further, as shown in FIG. 2, the mistizer 1 places the liquid pipe 5 in the casing 2 so as to be directed to the jet port 4 formed on the upper surface 2 t of the casing 2, that is, from the lower side to the upper side. Installing.
At this time, as shown in FIG. 2, when the liquid pipe 5 is inserted into the casing 2, the liquid pipe 5 is hermetically sealed via two upper and lower O-rings 10 and 11 and is inserted from the right side of the casing 2. Fixed by.
It is possible to adjust the height position of the liquid nozzle 7 of the liquid pipe 5 by loosening and releasing the fixing screw 12.
Then, the air flow path 6 is formed between the inner peripheral surface 3 b on the downstream side of the air passage 3 and the outer peripheral surface 5 a of the liquid pipe 5 so as to surround the liquid nozzle 7 at the outlet portion of the liquid pipe 5. Let it come out.
This air flow path 6 is a first air flow path that appears so that the flow path area gradually decreases by the reverse tapered third air passage 3-3 and the reverse tapered outer peripheral surface 5a of the liquid pipe 5. 6-1 and the second air flow that is located downstream of the first air flow path 6-1 and that appears by the fourth air path 3-4 and the liquid nozzle 7 at the outlet portion of the liquid pipe 5. Road 6-2.

Further, the guide groove for rectifying the air in the second air flow path 6-2 of the air flow path 6 is formed in the inner peripheral face 3b on the downstream side of the air passage 3 and the outer peripheral face 5a of the liquid pipe 5. Means 8 are provided.
As shown in FIG. 1, the guide groove means 8 includes a first groove portion 13 formed on the inner peripheral surface 3 b on the downstream side of the air passage 3 so as to be directed from the upstream side to the downstream side, and the outer periphery of the liquid pipe 5. The second groove portion 14 is formed on the surface 5a so as to be directed from the upstream side to the downstream side.
At this time, as shown in FIG. 1, the first and second groove portions 13 and 14 are linearly formed from the upstream side to the downstream side along the flow direction of the second air flow path 6-2. .
Further, when the first and second groove portions 13 and 14 of the guide groove means 8 are formed, the air flow direction, that is, a method of setting the same groove width from the upstream side to the downstream side, or the air flow rate is increased. Therefore, it is possible to adopt a measure for gradually decreasing the groove width from the upstream side toward the downstream side.

As shown in FIG. 3, the spout 4 formed on the upper surface 2t of the casing 2 includes a draining portion 15 having a downstream end projecting upward.
The draining portion 15 has a draining height h with the downstream end protruding upward, and has a draining width w in which the protruding portion gradually decreases in diameter from the heel to the top. is doing.

  Next, the operation will be described.

When air compressed in the air passage 3 in the casing 2 of the mistizer 1 is introduced from the air inlet 9, the air passes through the first air passage 3-1 of the air passage 3 communicating with the air inlet 9. Flows into the second air passage 3-2 of the air passage 3.
At this time, since the second air passage 3-2 has a large volume that functions as an expansion chamber, the flow velocity of the air temporarily decreases.
Then, the air in the second air passage 3-2 is discharged from the fourth air passage 3-4 to the outside of the casing 2 through the reversely tapered third air passage 3-3.

Further, in the air passing through the third air passage 3-3, the air flow passage which is made to appear between the inner peripheral surface 3b on the downstream side of the air passage 3 and the outer peripheral surface 5a of the liquid pipe 5. 6, the first air flow path 6 appears so as to gradually reduce the flow path area by the reverse tapered third air passage 3-3 and the reverse tapered outer peripheral surface 5 a of the liquid pipe 5. -1 increases the air flow rate.
Then, the air having an increased flow velocity appears from the first air flow path 6-1 by the fourth air path 3-4 and the liquid nozzle 7 at the outlet portion of the liquid pipe 5, and the second air flow path 6-6. 2 is discharged to the outside of the casing 2.
At this time, since the second air flow path 6-2 of the air flow path 6 surrounds the liquid nozzle 7 at the outlet portion of the liquid pipe 5, the liquid pipe 5 is caused by the venturi effect of air having an increased flow velocity. The liquid inside is sucked up through the liquid nozzle 7 and sprayed from the jet nozzle 4.

  Furthermore, between the inner peripheral surface 3b on the downstream side of the air passage 3 and the outer peripheral surface 5a of the liquid pipe 5, the inner peripheral surface 3b on the downstream side of the air passage 3 is formed so as to be directed from the upstream side to the downstream side. By providing the guide groove means 8 comprising the first groove portion 13 and the second groove portion 14 formed on the outer peripheral surface 5a of the liquid pipe 5 so as to be directed from the upstream side to the downstream side, this guide is provided. Air passing through the first and second groove portions 13 and 14 of the groove means 8 is reliably guided from the upstream side to the downstream side, and the air is rectified.

  Furthermore, the draining portion 15 having a draining height h that protrudes upward at the downstream end and a draining width w that gradually reduces the diameter of the protruding portion from the flange toward the top. By providing the nozzle 4 on the upper surface 2 t of the casing 2, the drainer 15 uses the drainage height h and drainage width w to remove the liquid in the vicinity of the nozzle 4. It is spaced apart to the heel part side, prevents the liquid near the spout 4 from being blown up again, and contributes to the realization of uniform and fine spraying.

Thus, in the mistomizer 1 for spraying a liquid, a casing 2 serving as a main body of the mistmizer 1 is provided, an air passage 3 for guiding compressed air is provided in the casing 2, and the air passage 3 of the casing 2 is provided. An outlet 4 is provided at the downstream end, a liquid pipe 5 attached to the casing 2 is provided so as to face the outlet 4, and an inner peripheral surface 3b on the downstream side of the air passage 3 and an outer peripheral face 5a of the liquid pipe 5 are provided. The air flow path 6 is made to appear, and the air flow path 6 surrounds the liquid nozzle 7 at the outlet portion of the liquid pipe 5, and the inner peripheral surface 3 b on the downstream side of the air path 3 and the liquid pipe 5 is provided with guide groove means 8 for rectifying air in the air flow path 6.
Therefore, the configuration of the mistomizer 1 can be simplified, the mistmizer 1 can be easily manufactured, and the cost can be reduced, which is economically advantageous.

  Further, with the simplification of the configuration of the mist-mizer 1, the mist-mizer 1 can be easily adjusted by simply moving the liquid nozzle 7 up and down by releasing the fixing with the set screw 12 without requiring skill. The spray amount can be easily adjusted, and the usability of the mistomizer 1 can be improved.

  Further, the configuration in which the air flow path 6 of the mistomizer 1 surrounds the liquid nozzle 7 at the outlet portion of the liquid pipe 5 causes the compressed air to flow so as to wrap around the center of the liquid nozzle 7, and the flow of the spray is By having a center coaxial with the liquid nozzle 7, the straightness of spraying can be increased.

  Further, the air in the air flow path 6 can be rectified by the guide groove means 8 provided on the inner peripheral surface 3 b on the downstream side of the air passage 3 and the outer peripheral surface 5 a of the liquid pipe 5.

  Thereby, since the rectified straight running spray can be performed, the spray performance of the mistomizer 1 can be improved, and a more uniform spray is possible. For example, when the spray test is performed, the spray test is performed. The stability of can be increased. Furthermore, the spray collection amount distribution in the test tank of the spray tester in the spray test can be made more uniform.

The guide groove means 8 includes a first groove portion 13 formed on the inner peripheral surface 3 b on the downstream side of the air passage 3 so as to be directed from the upstream side to the downstream side, and an upstream surface on the outer peripheral surface 5 a of the liquid pipe 5. The second groove portion 14 is formed so as to be directed from the side toward the downstream side.
Therefore, by providing the guide groove means 8, the air passing through the first and second groove portions 13 and 14 of the guide groove means 8 is reliably guided, the air is rectified, and the straightness of the spray is improved. be able to.

  Furthermore, the provision of the draining portion 15 at the ejection port 4 of the mistomizer 1 can reliably eliminate the problem that the liquid does not adhere to the vicinity of the ejection port 4 and the liquid is blown up again.

The mistizer 1 is used in a spray tester that tests by spraying a liquid such as salt water on a test piece.
An example of the embodiment of the spray test is shown below. FIG. 4 shows a state where the mistizer is installed in the spray tower.

  The mistizer 1 is installed in the spray tower 21 and sucks the liquid from the solution reservoir 23 at the lower part of the spray tower 21 and sprays the liquid from the upper part of the spray tower 21 to the entire test chamber. Examples of the test piece installed in the test tank include metal materials such as automobiles and building materials, plating, coating films, plastics, and the like. The spray tower 21 is arranged in the center of the test tank, the test pieces are arranged in the test piece holder in the tank, and the liquid is sprayed from the spray tower 21 to the entire tank under a certain condition, so that the spray uniformly pours onto the test pieces. The test is performed as described above.

That is, the spray tower 21 includes a solution reservoir 23 and a cylindrical body 22 standing on the upper surface of the solution reservoir 23, as shown in FIG.
The casing 2 of the mistomizer 1 is installed on the upper surface of the solution reservoir 23 and in the cylindrical body 22, and the liquid introduction pipe 5 is suspended from the casing 2 into the solution reservoir 23.
At this time, the liquid to be sprayed is stored in the solution reservoir 23.
Further, as shown in FIG. 4, the cylindrical body 22 extends upward from the upper surface of the solution reservoir 23.
And the air introduction pipe | tube 24 which supplies the compressed air is connected to the air path of the casing 2 of the mist-mizer 1.
Furthermore, at the highest height position of the cylindrical body 22, as shown in FIG. 4, a spray amount adjuster 26 for adjusting the spray amount and guiding the spray in a predetermined direction is attached.

Then, the spray test can be performed by attaching the mistizer 1 to the spray tower 21, and the spray performance of the spray test can be performed by performing more uniform spraying according to the spray performance of the mistizer 1 that performs rectified straight traveling. Stability can be increased.
Further, the spray collection amount distribution in the test tank in the spray test can be made more uniform.

DESCRIPTION OF SYMBOLS 1 Mistomizer for spraying 2 Casing 2t Upper surface 3 Air flow path 3b Inner peripheral surface 3-1 1st air flow path 3-2 2nd air flow path 3-3 3rd air flow path 3-4 4th air flow path 4 Outlet 5 Liquid pipe 5a Outer peripheral surface 6 Air flow path 6-1 First air flow path 6-2 Second air flow path 7 Liquid nozzle 8 Guide groove means 9 Air inlet 10, 11 Two-stage O-ring 12 Stop screw 13 First groove 14 First 2 grooves 15 Drainage section h Drainage height w Drainage width

Claims (3)

  In the mistomizer used for the spray test, a casing as a main body of the mistmizer is provided, an air passage for guiding the compressed air is provided in the casing, and an outlet is provided at the downstream end of the airway of the casing. A liquid pipe attached to the casing is provided so as to face the air channel, and an air flow path appears between the inner peripheral surface on the downstream side of the air passage and the outer peripheral surface of the liquid pipe. A guide groove means for rectifying the air in the air flow path is provided on the inner peripheral surface on the downstream side of the air passage and on the outer peripheral surface of the liquid pipe, while surrounding the liquid nozzle at the outlet portion of the pipe. Mistomizer for spray test.   The guide groove means directs from the upstream side to the downstream side on the outer peripheral surface of the liquid pipe, and the first groove portion formed so as to be directed from the upstream side to the downstream side on the inner peripheral surface on the downstream side of the air passage. 2. The spray test mistizer according to claim 1, comprising: a second groove formed on   The spout formed in the upper surface of the casing includes a draining portion with a downstream end protruding upward, and the draining portion has a draining height with a downstream end protruding upward. The spray test mist-mizer according to claim 1, further comprising: a width for draining the projecting portion having a gradually reduced diameter from the heel portion toward the top portion.

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