Spray equipment and spray corrosion testers

Abstract

To provide a spray device and a spray corrosion testing machine having the same.SOLUTION: A spray device comprises: a liquid introduction pipe into which a spray liquid is introduced; an air introduction pipe into which air is introduced; a mounting member that holds the liquid introduction pipe and the air introduction pipe and is detachably attached to a spray tower; a sprayer that sprays the spray liquid; and a positioning member that defines a relative position between the sprayer and the mounting member. The sprayer includes a nozzle, a first coupling part, and a second coupling part. The nozzle has an air passage including an opening, and is detachably connected to the air introduction pipe. The first coupling part has a first liquid passage including a liquid outlet, is detachably attached to the nozzle, and penetrates the first liquid passage through the air passage to expose the liquid outlet externally from the opening. The second coupling part has a second liquid passage, is detachably attached to the first coupling part, communicates the first liquid passage with the second liquid passage, and is detachably connected to the liquid introduction pipe.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present disclosure relates to a spray device and a spray corrosion tester equipped with the spray device. [Background technology]

[0002] Generally, a spray corrosion tester is equipped with a sprayer having an air nozzle and a liquid nozzle inside a test tank, and is configured so that the corrosive liquid (corrosive solution such as salt water) inside the liquid nozzle is sucked up by the Venturi effect of the saturated compressed air sprayed from the air nozzle and is sprayed uniformly as fine particles onto the test piece placed in the test tank.

[0003] In addition, as a test that more closely resembles the natural environment and is more accelerated, there is a combined cyclic test in which the above-mentioned spray corrosion test is combined with other tests such as a dry test, a wet test, an immersion test, and a low-temperature test to form one cycle, and the test piece is exposed to this cycle repeatedly. A combined cyclic test machine capable of performing this combined cyclic test is already in use as one of the spray corrosion test machines.

[0004] In a spray corrosion tester, the amount and direction of spray are determined by the relative positions of the air nozzle and the liquid nozzle, so there is the inconvenience that very difficult installation work with precise dimensions is required to ensure the spray travels in a straight line. For this reason, several proposals have been made to improve usability (for example, see Patent Document 3).

[0005] Furthermore, in a spray corrosion tester, the corrosive solution adhering to the tip of the liquid nozzle may dry, causing dissolved components to precipitate. In this case, precipitates from the corrosive solution, such as crystallized salt, may clog the tip of the liquid nozzle, potentially preventing the specified spray volume from being achieved. For this reason, several proposals have been made to prevent clogging of the liquid nozzle caused by precipitates (see, for example, Patent Document 1). [Prior art documents] [Patent documents]

[0006] [Patent Document 1] Patent No. 5810377 [Patent Document 2] Patent Publication No. 2002-224592 [Patent Document 3] Patent No. 4902762 Summary of the Invention [Problem to be solved by the invention]

[0007] For such spray corrosion testing machines, there is a need for a spray device that can be easily disassembled and assembled, can be easily installed in a predetermined position and orientation relative to the spray tower in the test tank of the spray corrosion testing machine, and can ensure appropriate spray conditions.

[0008] Therefore, there is a demand for a spray device that has a simple configuration yet can stably spray an appropriate amount of corrosive liquid. [Means for solving the problem]

[0009] One embodiment of the present disclosure provides a spray device installed in a spray tower located in a test tank of a spray corrosion tester. The spray device includes a liquid inlet pipe through which the spray liquid is introduced, an air inlet pipe through which air is introduced, a mounting member that holds the liquid inlet pipe and the air inlet pipe and is detachably attached to the spray tower, a sprayer that sprays the spray liquid, and a positioning member that determines the relative position of the sprayer and the mounting member. The sprayer has a nozzle, a first coupling, and a second coupling. The nozzle has an air flow path including an opening and is detachably connected to the air inlet pipe. The first coupling has a first liquid flow path including a liquid outlet and is detachably attached to the nozzle. The first liquid flow path passes through the air flow path, exposing the liquid outlet to the outside through the opening. The second coupling has a second liquid flow path and is detachably attached to the first coupling. The second coupling communicates the first liquid flow path with the second liquid flow path and is detachably connected to the liquid inlet pipe.

[0010] In a spraying device according to an embodiment of the present disclosure, the sprayer is configured using a nozzle, a first coupling, and a second coupling. The nozzle, the first coupling, and the second coupling are separably attached, allowing the nozzle, the first coupling, and the second coupling to be individually disassembled and cleaned. Furthermore, in a spraying device according to an embodiment of the present disclosure, a positioning member defines the relative position of the sprayer nozzle and the mounting member. Therefore, the nozzle can be easily and reproducibly positioned in a predetermined position and orientation on the mounting member, which is detachably attached to the spray tower, via the positioning member. Therefore, the sprayer nozzle can be easily installed in a predetermined position and orientation on the spray tower in the test tank of the spray corrosion tester. Furthermore, in a spraying device according to an embodiment of the present disclosure, an air flow path is formed around the liquid flow path, allowing the spray flow to be coaxial with the liquid flow path and to travel in a straight line. [Effects of the Invention]

[0011] According to the spray device of one embodiment of the present disclosure, by having the above configuration, even if the spray device is disassembled for cleaning or the like and then reassembled, the sprayer nozzle can be stably installed in a predetermined position and in a predetermined orientation relative to the spray tower. Furthermore, according to the spray device of one embodiment of the present disclosure, the spray flow has a straightness, thereby enabling highly uniform spraying. Therefore, according to the spray device of one embodiment of the present disclosure, stable spraying can be performed uniformly in the test tank. [Brief explanation of the drawings]

[0012] [Figure 1] FIG. 1 is a schematic diagram illustrating an example of the configuration of a spray device according to an embodiment of the present disclosure. [Figure 2] FIG. 2 is a schematic diagram showing the configuration of a spray corrosion tester equipped with the spray device shown in FIG. DETAILED DESCRIPTION OF THE INVENTION

[0013] An embodiment of the present disclosure will be described in detail below with reference to the drawings. The following description is a specific example of the present disclosure, and the present disclosure is not limited to the following embodiment. Furthermore, the present disclosure is not limited to the arrangement, dimensions, dimensional ratios, etc. of each component shown in each drawing. The description will be given in the following order. 1. Embodiment (Example of spray corrosion tester) 1-1.Configuration of the spray device 1-2. Overall configuration of the spray corrosion tester 1-3. Operation of the spray corrosion tester 1-4. Function and effect of spray corrosion tester 2. Variations

[0014] <1. Embodiment> [1-1. Configuration of spray device] FIG. 1 is a schematic diagram illustrating an example of the general configuration of a spray device 3 according to an embodiment of the present disclosure.

[0015] As shown in FIG. 1, the spray device 3 includes a sprayer 30, a block 34, an air introduction pipe 35, a liquid introduction pipe 36, a positioning member 37, and a screw member 38.

[0016] The sprayer 30 has, for example, a nozzle 31, a first coupling portion 32, and a second coupling portion 33. The sprayer 30 uses saturated air flowing through an air flow path 311 formed in the nozzle 31 to spray the spray liquid flowing through a first liquid flow path P1 of the first coupling portion 32 and a second liquid flow path P2 of the second coupling portion 33. The nozzle 31, the first coupling portion 32, and the second coupling portion 33 may be formed using, for example, a resin material such as an acrylic resin.

[0017] The nozzle 31 has an air flow path 311 including an opening 31H, is connected to the air inlet pipe 35 via an air communication hole J1, and is fixed by, for example, a screw mechanism. With this structure, saturated air from an air supply unit (not shown) is introduced through the air inlet pipe 35 and the air communication hole J1 into the air flow path 311, and is then ejected from the opening 31H.

[0018] The first coupling portion 32 has a first liquid flow path P1 including a liquid ejection port 32H, and is detachably attached to the nozzle 31 and fixed thereto by, for example, a screw mechanism. The first liquid flow path P1 passes through the air flow path 311, exposing the liquid ejection port 32H to the outside of the nozzle 31 through the opening 31H. It is particularly preferable that the liquid ejection port 32H protrudes from the opening 31H to the outside of the nozzle 31, as in the example configuration shown in FIG. 1. This stabilizes the suction of the sprayed liquid (the phenomenon in which negative pressure is generated at the liquid ejection port 32H and the sprayed liquid is sucked in), allowing the spray state to continue for a longer period of time.

[0019] The flow rectifying member 322 has, for example, a substantially cylindrical appearance, and is disposed so as to surround part of the outer periphery of the first liquid flow path P1 of the first coupling portion 32. The flow rectifying member 322 has one or more through holes. The through holes of the flow rectifying member 322 maintain the straightness of the flow of saturated air in the air flow path 311 toward the opening 31H.

[0020] The second joint portion 33 has a second liquid flow path P2, and is composed of a fixed portion 332 and a rotating portion 331.

[0021] The rotating part 331 is rotatable relative to the fixed part 332 around a rotation axis along the second liquid flow path P2, is detachably attached to the first connecting part 32, and communicates the first liquid flow path P1 and the second liquid flow path P2 through the liquid flow path communication hole J2. The rotating part 331 and the first connecting part 32 are each fixed by, for example, a screw mechanism. The fixed part 332 is detachably connected to the liquid introduction pipe 36, and communicates the second liquid flow path P2 and the liquid introduction pipe 36 through the liquid communication hole J3. The fixed part 332 and the liquid introduction pipe 36 are each fixed by, for example, a screw mechanism. With this structure, the spray liquid from the liquid supply part (not shown) passes through the liquid introduction pipe 36 and the liquid communication hole J3 to be introduced into the first liquid flow path P1 and the second liquid flow path P2.

[0022] The block 34 is held by screw members 38 through which the air introduction pipe 35 and the liquid introduction pipe 36 pass, and is detachably attached to the spray tower 4. The block 34 corresponds to a specific example of an "attachment member" according to one aspect of the present disclosure.

[0023] The positioning member 37 is detachably attached to both the nozzle 31 and the block 34 of the sprayer 30. The positioning member 37 determines the relative positions of the nozzle 31 and the block 34. The positioning member 37 is preferably made of a resin material such as an acrylic resin.

[0024] The screw member 38 fixes the block 34 to the air inlet pipe 35 and the liquid inlet pipe 36. The screw member 38, the block 34, the air inlet pipe 35, and the liquid inlet pipe 36 may be formed using a resin material such as an acrylic resin.

[0025] [1-2. Overall configuration of spray corrosion tester] FIG. 2 is a schematic diagram showing an example of the general configuration of a spray corrosion tester 1 equipped with the spray device 3 shown in FIG.

[0026] 2, the spray corrosion tester 1 includes a test tank 2, a spray device 3, a spray tower 4, and a control unit 5. The spray corrosion tester 1 corresponds to a specific example of a "spray corrosion tester" according to one aspect of the present disclosure.

[0027] The spray corrosion tester 1 performs a spray corrosion test in which a corrosive liquid such as salt water is sprayed onto a test piece S placed inside a test tank 2, and the corrosion resistance of the test piece S is evaluated. Here, examples of the corrosive liquid that can be used include a neutral salt solution containing sodium chloride, an acetic acid salt solution in which acetic acid is added to a sodium chloride solution, and a CASS solution containing sodium chloride, cupric chloride, and acetic acid (for example, when salt water is used as the corrosive liquid, see JIS Z 2371:2015 "Salt Spray Test Method").

[0028] The test tank 2 is a container that houses the test specimen S and the spray tower 4, and has a space in which the corrosive liquid sprayed by the spray device 3 provided in the spray tower 4 can fall freely onto the test specimen S. The ceiling portion of the test tank 2 has a gable roof shape to prevent the sprayed corrosive liquid that adheres to the ceiling portion from falling onto the test specimen S.

[0029] The spraying device 3 is installed inside a spray tower 4 that stands upright inside the test chamber 2. The spray tower 4 has a cylinder 4A that extends vertically and a direction body 4B placed above it. The cylinder 4A may have several air circulation holes (not shown) at the bottom. The cylinder 4A has a block 34 of the spraying device 3 installed at a predetermined position on the side. The sprayer 30 of the spraying device 3 is inserted into the internal space of the cylinder 4A.

[0030] The control unit 5 utilizes a computer having a central processing unit (CPU) and memory. The control unit 5 controls the execution of the spray corrosion test by the operation of the CPU in accordance with a predetermined program stored in advance in the memory and based on various data such as the spray time of the corrosive solution and the temperature inside the test tank 2.

[0031] [1-3. Operation of the spray corrosion tester] (Spraying operation) In the spray corrosion tester 1, a corrosive solution is sprayed from a spray tower 4 into a test tank 2 in which a test piece S is placed in a predetermined position. The mist of corrosive solution sprayed into the test tank 2 falls naturally onto the test piece S, accelerating the corrosion of the test piece S.

[0032] Specifically, saturated air passes through air inlet pipe 35 of spray device 3 and is sent to nozzle 31 of sprayer 30, where it is sprayed from opening 31H. Corrosive liquid passes through liquid inlet pipe 36 and is sent to first liquid flow path P1 and second liquid flow path P2, where it is sprayed from liquid outlet 32H. Specifically, the corrosive liquid is drawn from liquid outlet 32H of first liquid flow path P1, which is located adjacent to opening 31H of nozzle 31, by the Venturi effect caused by the flow of saturated air sprayed from opening 31H. As a result, the corrosive liquid is sprayed almost uniformly into test tank 2 from the top of spray tower 4 as fine particles, for example, about 5 μm to 30 μm in size.

[0033] [1-4. Actions and Effects of the Spray Corrosion Tester] In the spray device 3 included in the spray corrosion tester 1 according to the embodiment of the present disclosure, the first liquid flow path P1 of the first coupling portion 32 of the sprayer 30 penetrates the nozzle 31, and an air flow path 311 is formed around the first liquid flow path P1 of the nozzle 31. The corrosive liquid flowing through the first liquid flow path P1 and the second liquid flow path P2 is coaxial with the saturated air in the air flow path 311, resulting in a highly straight and uniform spray of the corrosive liquid, and a stable spray state. In particular, providing a straightening member 322 on the air flow path 311 improves the straightness of the air flow near the opening 31H, reducing variations in the spray direction and spray amount, and further stabilizing the spray state of the corrosive liquid.

[0034] In the spray device 3 included in the spray corrosion tester 1 according to the embodiment of the present disclosure, the nozzle 31, the first coupling portion 32, and the second coupling portion 33 of the sprayer 30 are attached separably from one another, so that the nozzle 31, the first coupling portion 32, and the second coupling portion 33 can be individually disassembled and cleaned. This prevents clogging of the first liquid flow path P1 and the periphery of the liquid ejection port 32H due to deposition of deposits or the intrusion of foreign matter.

[0035] Furthermore, in the spray device 3, the relative position of the nozzle 31 of the sprayer 30 and the block 34 is defined by the positioning member 37. Therefore, the nozzle 31 of the sprayer 30 can be easily and reproducibly positioned at a predetermined position and in a predetermined orientation via the positioning member 37 with respect to the block 34, which is detachably attached to the spray tower 4. Specifically, the nozzle 31 can be positioned so that the center of the liquid outlet 32H coincides with the center of the spray tower 4 in the vertical direction. Therefore, in the spray device 3, even if the sprayer 30 is separated from the block 34 for disassembly and cleaning, etc., and then reattached to the block 34, the position, orientation, and inclination of the nozzle 31 of the sprayer 30 relative to the spray tower 4 remain constant, allowing the spray device 3 to be installed stably and reproducibly.

[0036] In the spray device 3 included in the spray corrosion tester 1, the block 34, the air introduction pipe 35, and the liquid introduction pipe 36 are each fixed by a screw member 38. In the sprayer 30 of the spray device 3, the nozzle 31 and the first connecting portion 32, and the first connecting portion 32 and the second connecting portion 33 are each fixed by a screw mechanism. The fixing work using the screw member 38 and the screw mechanism is simpler than when using adhesives or the like. Furthermore, the disassembly and assembly of each component can be performed repeatedly and easily. Furthermore, the positional error between the components during assembly can be reduced.

[0037] When the sprayer 3 is formed using a resin material, the dimensional accuracy of the sprayer 3 is improved because resin materials are easier to process than glass materials. This allows for stable spraying of the corrosive liquid with good reproducibility. Furthermore, resin materials have a smaller specific gravity than glass materials, which allows for a lighter sprayer 3. Furthermore, resin materials are less likely to break than glass materials and are easier to handle.

[0038] From the above, the spray corrosion tester 1 equipped with the spray device 3 is capable of carrying out a spray corrosion test with high reproducibility and stability.

[0039] Although the technology according to the present disclosure (the present technology) has been described above using embodiments, the present disclosure is not limited to the above embodiments and can be modified in various ways. For example, the arrangement position, shape, number, etc. of each component described in the above embodiments are merely examples and are not limited to those described in the above embodiments. Furthermore, components other than those described in the above embodiments may be included.

[0040] Specifically, in the spray corrosion tester 1 of the above embodiment, an example has been shown in which the air inlet pipe 35 and the liquid inlet pipe 36 of the spray device 3 are oriented in the same direction relative to the first liquid flow path P1 and the second liquid flow path P2, but this is not limited to this. For example, the second coupling part 33 may be rotated relative to the first coupling part 32, and the air inlet pipe 35 and the liquid inlet pipe 36 may be arranged in different directions relative to the first liquid flow path P1 and the second liquid flow path P2. This improves the degree of freedom in arrangement within the spray corrosion tester 1.

[0041] In addition, in the spray device 3 of the above embodiment, an example has been shown in which the first liquid flow path P1 and the second liquid flow path P2 of the sprayer 30 are provided so as to communicate with the interiors of the first connecting portion 32 and the second connecting portion 33, but this is not limited to this. For example, a third liquid flow path may be provided in the nozzle, and the first liquid flow path, the second liquid flow path, and the third liquid flow path may be communicated with each other.

[0042] In the above embodiment, the positioning member 37 and the air introduction pipe 35 are each described as a single component, but the present disclosure is not limited to this. For example, the positioning member 37 and the air introduction pipe 35 may be integrated into one component. In addition, the flow rectifying member 322 and the first liquid flow path P1 of the first connecting portion 32 are each described as a single component, but the present disclosure is not limited to this. For example, the flow rectifying member 322 and the first liquid flow path P1 of the first connecting portion 32 may be integrated into one component.

[0043] The effects described in this specification are merely examples and are not limited to those described, and other effects may also be obtained. [Explanation of symbols]

[0044] 1...spray corrosion testing machine, 2...test tank, 3...spraying device, 30...sprayer, 31...nozzle, 31H...opening, J1...air communication hole, J2...liquid flow path communication hole, J3...liquid communication hole, 311...air flow path, 32...first connecting part, 32H...liquid outlet, P1...first liquid flow path, P2...second liquid flow path, 322...rectifying member, 33...second connecting part, 331...rotating part, 332...fixed part, 34...block, 35...air introduction pipe, 36...liquid introduction pipe, 37...positioning member, 38...screw member, 4...spray tower, 5...control part, S...test piece.

Claims

1. A spray device installed in a spray tower disposed in a test tank of a spray corrosion tester, a liquid introduction pipe into which the spray liquid is introduced; an air introduction pipe through which air is introduced; An attachment member that holds the liquid introduction pipe and the air introduction pipe and is detachably attached to the spray tower; a sprayer for spraying a spray liquid; a positioning member that defines the relative position of the sprayer and the mounting member; Equipped with The sprayer comprises: A nozzle; A first coupling portion; A second coupling portion and and the nozzle has an air flow path including an opening and is detachably connected to the air introduction pipe; the first coupling portion has a first liquid flow path including a liquid ejection port, is detachably attached to the nozzle, and has the first liquid flow path penetrate the air flow path to expose the liquid ejection port to the outside through the opening; The second connecting portion has a second liquid flow path, is detachably attached to the first connecting portion, communicates the first liquid flow path with the second liquid flow path, and is detachably connected to the liquid introduction pipe.

2. The mounting member, the liquid introduction pipe, and the air introduction pipe are fixed by screw members, respectively. The spray device of claim 1.

3. the second coupling portion has a fixed portion and a rotating portion rotatable relative to the fixed portion about a rotation axis along the second liquid flow path, the rotating portion is detachably attached to the first coupling portion, The fixing portion is detachably attached to the liquid introduction pipe. The spray device of claim 1.

4. The nozzle, the first connecting portion, the second connecting portion, the mounting member, and the positioning member are made of resin. The spray device of claim 1.

5. The nozzle and the first coupling part are fixed by a screw mechanism, and the first coupling part and the second coupling part are fixed by a screw mechanism. The spray device of claim 1.

6. The positioning member defines the relative positions of the nozzle and the mounting member, and is detachably attached to both the nozzle and the mounting member. The spray device of claim 1.

7. A test tank; A spray tower disposed within the test tank; a spray device installed in the spray tower; Equipped with The spray device is a liquid introduction pipe into which the spray liquid is introduced; an air introduction pipe through which air is introduced; An attachment member that holds the liquid introduction pipe and the air introduction pipe and is detachably attached to the spray tower; a sprayer for spraying a spray liquid; a positioning member that defines the relative position of the sprayer and the mounting member; Equipped with The sprayer comprises: A nozzle; A first coupling portion; A second coupling portion and and the nozzle has an air flow path including an opening and is detachably connected to the air introduction pipe; the first coupling portion has a first liquid flow path including a liquid ejection port, is detachably attached to the nozzle, and has the first liquid flow path penetrate the air flow path to expose the liquid ejection port to the outside through the opening; The second connecting part has a second liquid flow path, is detachably attached to the first connecting part, communicates the first liquid flow path with the second liquid flow path, and is detachably connected to the liquid introduction pipe.

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