JP7478102B2 - Waterproof test device and waterproof test method - Google Patents

Description

The present invention relates to a waterproof test device and a waterproof test method.

Patent document 1 describes a waterproof testing method in which a gas pressure waterproof test is performed in which the watch is held under gas pressure to test its waterproofness, and after this test shows that there is no waterproofing defect, a liquid pressure waterproof test is performed in which the watch is held in a pressurized liquid to test its waterproofness.

JP 2005-106469 A

In the waterproof test method described in Patent Document 1, after performing a pressurized waterproof test in liquid, the watch is removed from the pressurized liquid, the removed watch is placed on a hot plate, and the presence or absence of water infiltration is judged based on whether or not water droplets or cloudiness occurs due to condensation. In other words, the waterproof test method described in Patent Document 1 requires a process of placing the test object on a hot plate and checking for condensation, and it is not possible to check whether or not water has infiltrated into the test object by the pressurized waterproof test in liquid alone, which is not simple.

The present invention was made in consideration of these circumstances, and aims to provide a waterproof testing device and a waterproof testing method that can easily check whether water has entered the test object.

The waterproof test device according to the present invention comprises a water tank that stores a liquid in which a test object is immersed, a pressure-resistant container in which the water tank is provided, a rod-shaped member provided on the upper surface of the pressure-resistant container and to which the test object is attached at its lower end, a pressure adjustment unit that pressurizes or depressurizes the inside of the pressure-resistant container, and a measurement unit that measures the weight of the test object, the pressure adjustment unit pressurizes or depressurizes the inside of the pressure-resistant container while the entire test object is provided inside the liquid and the test object is not in contact with the water tank, and the measurement unit continuously measures the weight while the inside of the pressure-resistant container is pressurized or depressurized by the pressure adjustment unit.

According to the present invention, the pressure adjustment unit pressurizes or depressurizes the inside of a pressure-resistant container with a water tank inside while the test object is not in contact with the water tank, and the measurement unit continuously measures the weight while the inside of the pressure-resistant container is pressurized by the pressurization unit. Because the test object is placed in the pressure-resistant container via a rod-shaped member, the weight of the test object changes when liquid enters the test object. Therefore, the presence or absence of liquid entering the test object can be detected based on the weight change measured by the measurement unit. In other words, the presence or absence of water entering the test object can be easily confirmed.

The measuring unit may be a weighing scale, the water tank may be placed on the measuring unit, and the water tank and the measuring unit may be provided inside the pressure-resistant container. When liquid enters the test object, the amount of liquid supported by the measuring unit, i.e., the weight measured by the measuring unit, decreases. Therefore, it is possible to detect whether liquid has entered the test object based on the change in weight measured by the measuring unit.

The measuring unit may be provided on the rod-shaped member. Since the test object is provided in the pressure-resistant container via the rod-shaped member, the measuring unit can directly measure the weight of the test object. Therefore, when liquid enters the test object, the amount of liquid supported by the measuring unit, i.e., the weight measured by the measuring unit, increases, making it possible to detect whether or not liquid has entered the test object.

The rod-shaped member may be rotatable. This allows air bubbles adhering to the test object to be removed. As a result, it is possible to prevent a decrease in the accuracy of the waterproof test due to the presence of air bubbles.

The rod-shaped member may be provided so as to be movable in the vertical direction. This allows air bubbles adhering to the test object to be removed. Also, the test object can be moved to an appropriate position by moving the rod-shaped member in the vertical direction.

The device may be equipped with a control unit that controls the pressure adjustment unit to gradually increase or decrease the pressure inside the pressure-resistant container. This allows for a quantitative evaluation of how much pressure the test object can withstand.

The pressure resistant container may be provided with a pressure gauge that measures the internal pressure, and the control unit may output the measurement results from the measurement unit in association with the measurement results from the pressure gauge. This allows the change in the measurement results from the measurement unit, i.e., the pressure when liquid penetrates the test object, to be quantitatively detected, and the degree of waterproof performance of the test object to be known.

The device may include a display unit that displays the measurement results from the measurement unit, and the display unit may continuously display the measurement results from the measurement unit. This makes it possible to check whether water has entered the device during the waterproof test.

The waterproof test method according to the present invention is characterized by including the steps of providing a measuring section and a water tank in which liquid is stored inside a pressure vessel and placing the water tank on the measuring section, attaching a test object to the lower end of a rod-shaped member provided on the upper surface of the pressure vessel, placing the entire test object inside the liquid and not touching the water tank, and measuring the weight with the measuring section while pressurizing the inside of the pressure vessel. This makes it easy to check whether liquid has entered the test object based on the weight change measured by the measuring section.

The waterproof test method according to the present invention is characterized by including the steps of providing a water tank in which liquid is stored inside a pressure vessel, attaching a test object to the lower end of a rod-shaped member provided on the upper surface of the pressure vessel and having a measuring unit, placing the entire test object inside the liquid and not touching the water tank, and measuring the weight with the measuring unit while pressurizing or depressurizing the inside of the pressure vessel. This makes it easy to check whether liquid has entered the test object based on the weight change measured by the measuring unit.

The method may include a step of removing any air bubbles adhering to the test object by rotating the rod-shaped member after placing the entire test object in the liquid, and may also include a step of pressurizing the inside of the pressure vessel after removing any air bubbles adhering to the test object. This makes it possible to prevent a decrease in accuracy of the waterproof test due to the presence of air bubbles.

The present invention makes it easy to check whether water has entered the test object.

FIG. 1 is a front view showing an outline of a waterproof test device 1. 1 is a plan view showing an outline of a waterproof testing device 1. FIG. 2 is a block diagram showing the electrical configuration of the waterproof test device 1. FIG. 1A and 1B are diagrams showing a schematic diagram of a waterproof test performed using the waterproof test device 1, in which (A) shows the state at the start of the test, and (B) shows a state in which liquid has entered the test subject X. 1A and 1B are diagrams showing an example of waterproof test results, in which (A) shows a case where the inside of the pressure vessel 10 is continuously pressurized, and (B) shows a case where the inside of the pressure vessel 10 is pressurized in stages. 1A and 1B are diagrams showing an example of waterproof test results, in which (A) shows a case where the pressure inside the pressure vessel 10 is continuously reduced, and (B) shows a case where the pressure inside the pressure vessel 10 is reduced in stages. FIG. 2 is a front view showing an outline of the waterproof test device 2. 2 is a block diagram showing the electrical configuration of the waterproof test device 2. FIG. 1A and 1B are diagrams showing a typical waterproof test performed using the waterproof test device 2, in which (A) shows the state at the start of the test, and (B) shows the state after liquid has entered the test subject X. 1A and 1B are diagrams showing an example of waterproof test results, in which (A) shows a case where the inside of the pressure vessel 10 is continuously pressurized, and (B) shows a case where the inside of the pressure vessel 10 is pressurized in stages. 1A and 1B are diagrams showing an example of waterproof test results, in which (A) shows a case where the pressure inside the pressure vessel 10 is continuously reduced, and (B) shows a case where the pressure inside the pressure vessel 10 is reduced in stages.

The following describes an embodiment of the waterproof test device and waterproof test method of the present invention with reference to the drawings.

First Embodiment
Fig. 1 is a front view showing an outline of the waterproof test device 1. In Fig. 1, the main parts are seen through. Fig. 2 is a plan view showing an outline of the waterproof test device 1. Fig. 2 shows a state in which a cover part 12 (described in detail later) is removed. Also, in Figs. 1 and 2, some components are not shown. Note that the up-down direction in Fig. 1 is the vertical direction, and the direction parallel to the paper surface of Fig. 2 is the horizontal direction.

The waterproof test device 1 has a pressure vessel 10, a rod-shaped member 15, a measuring unit 20, a water tank 30, a pressure gauge 40, and a pressure adjustment unit 60.

The pressure vessel 10 is a vessel capable of storing gas or liquid at a pressure higher than atmospheric pressure. The pressure vessel 10 may be entirely made of metal, or may be partially made of transparent resin.

The pressure vessel 10 is a generally cylindrical member whose bottom and top are covered with plate-like members. The pressure vessel 10 is hollow, and a measuring unit 20 and a water tank 30 are provided inside the pressure vessel 10. However, the shape of the pressure vessel 10 is not limited to this.

The pressure vessel 10 mainly has a main body 11 and a lid 12. The main body 11 has a generally cylindrical shape with a bottom, and the measuring unit 20 is placed on the bottom surface 11a via a platform 19.

In this embodiment, in consideration of the case where water is poured into the bottom surface of the hollow portion of the pressure-resistant vessel 10, a stand 19 is placed on the bottom surface 11a of the main body 11, and the measuring unit 20 is placed on the stand 19. However, the stand 19 is not essential, and if the stand 19 is not used, the measuring unit 20 can be placed on the bottom surface 11a.

The main body 11 is provided with a pressure gauge 40 and a pressure adjustment unit 60. The main body 11 is also provided with drawers 11c and 11d that draw the power cable 23 and the communication cable 24, one end of which is provided in the measurement unit 20, to the outside of the pressure-resistant vessel 10. The drawers 11c and 11d have holes (not shown) through which the power cable 23 and the communication cable 24 are inserted, and a sealing member (not shown) that seals the holes.

The main body 11 is further provided with an air supply port 11e that supplies air from an air compressor 51 (see FIG. 3, described in detail later) to the internal space of the pressure-resistant vessel 10, and an air exhaust port 11f that exhausts the air inside the pressure-resistant vessel 10 to the outside of the pressure-resistant vessel 10. A pressure reducing section 55 (see FIG. 3, described in detail later) is connected to the air exhaust port 11f.

The main body 11 is provided with a toggle clamp 13. The toggle clamp 13 is a holding member that uses a toggle mechanism and secures the lid 12 to the main body 11.

The lid 12 is a generally plate-shaped member that covers an opening formed on the top surface of the main body 11. The convex portion 12a on the back surface of the lid 12 is inserted into the inside of the side surface 11b of the main body 11, and the lid 12 and the main body 11 are fixed together with a toggle clamp 13, thereby forming a pressure-resistant vessel 10 with a hollow interior.

The rod-shaped member 15 is a rod-shaped member provided on the upper surface (here, the lid portion 12) of the pressure-resistant vessel 10. The rod-shaped member 15 is provided so as to be rotatable and movable in the vertical direction.

A metal fitting 16 is provided at the lower end of the rod-shaped member 15. The test object X is attached to the lower end of the rod-shaped member 15 via the metal fitting 16. The metal fitting 16 is detachable from the rod-shaped member 15 and can be replaced with a metal fitting of a different form.

The measurement unit 20 is a weighing device that measures the weight of the test object X, and has a mounting unit 21 on its upper surface. A water tank 30 is placed on the upper surface of the mounting unit 21. The measurement unit 20 also has a display unit 22 that displays the measurement results of the measurement unit 20. The display unit 22 may display the measurement results as numbers, which is known as a digital display (see FIG. 2), or may display a so-called analog display in which a needle moves according to the measurement result (see FIG. 4).

The water tank 30 is a container that stores a liquid. In this embodiment, water is stored in the water tank 30 as the liquid. The test object X is immersed in the water L stored in the water tank 30. Note that the liquid stored in the water tank 30 is not limited to water L.

The pressure gauge 40 is, for example, a pressure gauge, and measures the internal pressure of the pressure vessel 10.

Figure 3 is a block diagram showing the electrical configuration of the waterproof test device 1. The waterproof test device 1 has a CPU (Central Processing Unit) 151, a RAM (Random Access Memory) 152, a ROM (Read Only Memory) 153, an input/output interface (I/F) 154, a communication interface (I/F) 155, and a media interface (I/F) 156, which are connected to the measurement unit 20, the pressure gauge 40, the pressure adjustment unit 60, etc.

The pressure adjustment unit 60 has a pressurizing unit 50 and a decompression unit 55. The pressurizing unit 50 is a member that pressurizes the inside of the pressure-resistant vessel 10, and mainly has an air compressor 51, which is an air pressure supply source, and a regulator 52. The air compressor 51 is connected to the air supply port 11e (see FIG. 2) by piping (not shown). The regulator 52 adjusts the pressure of the air supplied from the air compressor 51 to the pressure-resistant vessel 10 to a predetermined pressure. As a result, the pressure in the pressure-resistant vessel 10 is maintained at the predetermined pressure.

The pressure reducing unit 55 is a member that exhausts gas from the pressure vessel 10 through the air exhaust port 11f (see FIG. 2) and reduces the pressure inside the pressure vessel 10. The pressure reducing unit 55 has a pump (e.g., a vacuum pump) and a regulator, and adjusts the pressure in the pressure vessel 10 to a predetermined pressure using the regulator.

RAM 152 is a volatile memory. ROM 153 is a non-volatile memory, and includes a read-only ROM and a writable flash memory in which various control programs and the like are stored. CPU 151 operates based on the programs stored in RAM 152 and ROM 153, and controls each part.

The CPU 151 has the function of a control unit 151a that controls each part of the waterproof test device 1. The control unit 151a is constructed by executing a predetermined program that the CPU 151 has loaded. The control unit 151a controls the measurement unit 20, the pressure gauge 40, the pressure adjustment unit 60, etc. Specifically, the CPU 151 controls the pressure adjustment unit 60 based on the output from the pressure gauge 40, and adjusts and maintains the pressure in the pressure-resistant vessel 10 to a predetermined pressure.

The CPU 151 controls an input/output device 161, which includes input devices such as a keyboard and a mouse and output devices such as a monitor, via an input/output interface 154. The communication interface 155 receives data from other devices via a network 162 and transmits it to the CPU 151, and also transmits data generated by the CPU 151 to other devices via the network 162.

The media interface 156 reads the programs and data stored in the storage medium 163 and stores them in the RAM 152. The storage medium 163 is, for example, an IC card, an SD card, a DVD, etc. The programs that realize each function are, for example, read from the storage medium 163, installed in the waterproof test device 1 via the RAM 152, and executed by the CPU 151.

The configuration of the waterproof test device 1 shown in FIG. 3 is a description of the main configuration in explaining the features of this embodiment, and does not exclude the configuration of, for example, a general information processing device. The components of the waterproof test device 1 may be further classified into more components depending on the processing content, or one component may execute the processing of multiple components.

Next, we will explain the waterproof test performed using the waterproof test device 1. Figure 4 is a schematic diagram showing how the waterproof test is performed using the waterproof test device 1, where (A) shows the state at the start of the test, and (B) shows the state after liquid has entered the test subject X.

First, the measuring unit 20 and the water tank 30 in which liquid is stored are provided inside the pressure-resistant container 10. Specifically, the lid 12 of the pressure-resistant container 10 is removed, the measuring unit 20 is placed on the platform 19 placed on the bottom surface 11a, and the water tank 30 in which water L is stored is placed on the measuring unit 20.

Next, the test object X is attached to the lower end of the rod-shaped member 15 attached to the lid 12 via the metal fitting 16. Then, the lid 12 is lifted using a gripping part (not shown), placed on the main body 11, and attached to the main body 11 using the toggle clamp 13. If necessary, the rod-shaped member 15 is moved vertically to immerse the test object X in the liquid. At this time, the entire test object X is placed inside the liquid, and the test object X is not in contact with the water tank 30 (see FIG. 4(A)).

In addition, when the entire test object X is placed inside the liquid and air bubbles are found around the test object X, the rod-shaped member 15 is rotated to remove the air bubbles that have adhered to the test object X. Although this step is not essential, it is desirable to remove the air bubbles that have adhered to the test object X in order to prevent a decrease in the accuracy of the waterproof test due to the presence of air bubbles. In addition, the method of removing the air bubbles that have adhered to the test object X is not limited to rotating the rod-shaped member 15, and the rod-shaped member 15 may be moved up and down. However, in order to remove the air bubbles without ruffling the water L, it is desirable to rotate the rod-shaped member 15 to remove the air bubbles that have adhered to the test object X.

The control unit 151 a controls the pressure adjustment unit 60 to pressurize or depressurize the inside of the pressure-resistant vessel 10 .
That is, the control unit 151a controls the pressurizing unit 50 to supply air into the pressure-resistant container 10, thereby pressurizing the inside of the pressure-resistant container 10 with the test object X held in the liquid. Alternatively, the control unit 151a controls the depressurizing unit 55 to exhaust air from the inside of the pressure-resistant container 10, thereby depressurizing the inside of the pressure-resistant container 10 with the test object X held in the liquid. In this way, the liquid is pressurized or depressurized with the test object X held in the liquid. Also, the weight is measured by the measuring unit 20 while the inside of the pressure-resistant container 10 is pressurized or depressurized.

Since the test object X is attached to the pressure-resistant container 10 via the rod-shaped member 15, when liquid infiltrates the test object X, the amount of liquid supported by the measuring unit 20, i.e., the weight measured by the measuring unit 20, decreases. Therefore, the presence or absence of liquid infiltration into the test object X can be detected based on the weight change measured by the measuring unit 20. Therefore, the presence or absence of liquid infiltration into the test object X can be detected during the waterproof test, and there is no need to check the presence or absence of liquid infiltration by disassembling the test object X after the waterproof test.

In particular, by continuously measuring the weight with the measuring unit 20 while the inside of the pressure-resistant container 10 is pressurized or depressurized by the pressure adjusting unit 60 and continuously displaying the measurement results on the display unit 22, it is possible to detect in real time the point at which liquid has entered the test object X.

Figure 5 shows an example of a waterproof test result, where (A) shows a case where the inside of the pressure vessel 10 is continuously pressurized, and (B) shows a case where the inside of the pressure vessel 10 is pressurized in stages. Figure 6 shows an example of a waterproof test result, where (A) shows a case where the inside of the pressure vessel 10 is continuously depressurized, and (B) shows a case where the inside of the pressure vessel 10 is depressurized in stages. In Figures 5 and 6, the solid line indicates the internal pressure of the pressure vessel 10, and the dotted line indicates the weight measurement result in the measuring section 20.

The control unit 151a controls the internal pressure of the pressure-resistant vessel 10 so that the pressure changes as shown in Figures 5 and 6. The control unit 151a also outputs the measurement results of the measurement unit 20 and the measurement results of the pressure gauge 40 in association with each other. The results are output to, for example, the input/output device 161 (for example, an external monitor (not shown)) or a memory unit (for example, the ROM 153 or the memory medium 163).

When the result of correlating the measurement result of the measurement unit 20 with the measurement result of the pressure gauge 40 is output to the input/output device 161, the graphs shown in Figures 5 and 6 are displayed on the input/output device 161. Since the measurement result (weight) of the measurement unit 20 and the measurement result of the pressure gauge 40 (internal pressure of the pressure-resistant container 10) are correlated, it is possible to quantitatively detect the pressure when the measurement result of the measurement unit 20 decreases, i.e., when liquid enters the test object X. This makes it possible to know the degree of waterproof performance of the test object X.

When the results of associating the measurement results from the measurement unit 20 with the measurement results from the pressure gauge 40 are output to the memory unit, the measurement results from the measurement unit 20 and the measurement results from the pressure gauge 40 are associated and stored in the memory unit. This allows the test results to be checked not only during the test but also afterwards.

As shown in Figures 5 and 6 (A), when the inside of the pressure-resistant vessel 10 is continuously pressurized or depressurized, it is possible to confirm the waterproof performance at the final pressure after pressurization or depressurization. Also, as shown in Figures 5 and 6 (B), when the inside of the pressure-resistant vessel 10 is pressurized or depressurized in stages, it is possible to quantitatively evaluate how much pressure the test object X can withstand.

According to this embodiment, by checking the measurement results from the measuring unit 20 during the waterproof test, it is possible to check whether water has entered the test object. Therefore, it is not necessary to disassemble the test object X after the waterproof test, and a simple waterproof test method can be provided.

In addition, according to this embodiment, by correlating the measurement results from the measurement unit 20 with the measurement results from the pressure gauge 40, it is possible to quantitatively detect the pressure at which liquid penetrates into the test object X. For example, if the test object X is removed from the liquid after the test to check whether liquid has penetrated, a qualitative determination (whether it is waterproof or not) can be made, but a quantitative determination (at what pressure did the intrusion occur) cannot be made. In contrast, in this embodiment, the state of liquid intrusion is clear, so a quantitative determination is possible.

In this embodiment, the power supply is supplied by connecting the power cable 23 to the measurement unit 20, but the connection of the power cable 23 is not essential, and if the power cable 23 is not used, a battery may be provided in the measurement unit 20. Also, in this embodiment, the communication cable 24 is connected to the measurement unit 20, and the control unit 151a acquires the measurement results of the measurement unit 20 via the communication cable 24 and outputs them to the input/output device 161, etc., but the connection of the communication cable 24 is not essential, and the control unit 151a may acquire the measurement results of the measurement unit 20 via wireless communication.

In addition, in this embodiment, the waterproof test was performed by immersing the test object X in water, but the test object X may also be immersed in a colored liquid or a liquid that reacts to light (for example, a liquid containing fluorescent paint). Although it is necessary to disassemble the test object X after the waterproof test, the locations where water has entered can also be determined in a single test.

In addition, in this embodiment, the waterproof test device 1 has a CPU 151, a RAM 152, a ROM 153, an input/output I/F 154, a communication I/F 155, and a media I/F 156, but these configurations are not essential. If the waterproof test device 1 does not have a CPU 151, a RAM 152, a ROM 153, an input/output I/F 154, a communication I/F 155, and a media I/F 156, the pressure adjustment unit 60 can be operated manually.

In addition, in this embodiment, the pressure adjustment unit 60 has a pressurizing unit 50 and a depressurizing unit 55, but it is sufficient for the pressure adjustment unit 60 to have at least one of the pressurizing unit 50 and the depressurizing unit 55.

Second Embodiment
In the first embodiment of the present invention, the intrusion of liquid into the test object X is detected by measuring the weight of the water tank 30 with the measurement unit 20, but the method of detecting the intrusion of liquid into the test object X is not limited to this.

The second embodiment of the present invention is an embodiment in which the weight of the test object X is measured directly. Below, the waterproof test device 2 according to the second embodiment will be described. Note that the same parts as those in the first embodiment are given the same reference numerals and the description will be omitted.

Figure 7 is a front view showing an outline of the waterproof test device 2. In Figure 7, the main parts are seen through, and some components are not shown. Note that the up-down direction in Figure 7 is the vertical direction, and the left-right direction in Figure 7 is the horizontal direction.

The waterproof test device 2 has a pressure vessel 10, a rod-shaped member 15A, a measuring section 25, a water tank 30, a pressure gauge 40 (not shown in FIG. 7), and a pressure adjustment section 60 (not shown in FIG. 7).

The rod-shaped member 15A is a rod-shaped member provided on the upper surface of the pressure-resistant vessel 10. The rod-shaped member 15A is provided so as to be rotatable and movable in the vertical direction. A metal fitting 16 is provided at the lower end of the rod-shaped member 15A.

The rod-shaped member 15A has two rod-shaped members 15a and 15b, and the measuring section 25 is provided between the two rod-shaped members 15a and 15b.

The measuring unit 25 is for measuring the weight of the test object X, and is, for example, a load cell. The measuring unit 25 can continuously measure the weight of the test object X and its changes.

The cable attached to the measuring unit 25 is pulled out to the outside of the pressure vessel 10 through a hole (not shown) provided in the lid 12. The hole is sealed by a sealing member (not shown).

Figure 8 is a block diagram showing the electrical configuration of the waterproof test device 2. The waterproof test device 2 has a CPU (Central Processing Unit) 151, a RAM (Random Access Memory) 152, a ROM (Read Only Memory) 153, an input/output interface (I/F) 154, a communication interface (I/F) 155, and a media interface (I/F) 156, which are connected to the measurement unit 25, the pressure gauge 40, the pressure adjustment unit 60, etc.

The CPU 151 has the function of a control unit 151a that controls each part of the waterproof test device 1, and controls the measurement unit 25, pressure gauge 40, pressure adjustment unit 60, etc.

The configuration of the waterproof test device 2 shown in FIG. 8 is a description of the main configuration in explaining the features of this embodiment, and does not exclude the configuration of, for example, a general information processing device. The components of the waterproof test device 2 may be further classified into more components depending on the processing content, or one component may execute the processing of multiple components.

Next, we will explain the waterproof test performed using the waterproof test device 2. Figure 9 is a schematic diagram showing how a waterproof test is performed using the waterproof test device 2, where (A) shows the state at the start of the test, and (B) shows the state after liquid has entered the test subject X.

First, a water tank 30 in which liquid is stored is provided inside the pressure-resistant container 10. Specifically, the lid 12 of the pressure-resistant container 10 is removed, and the water tank 30 in which water L is stored is placed on the bottom surface 11a (here, the platform 19 placed on the bottom surface 11a). Then, the test object X is attached to the lower end of the rod-shaped member 15 provided on the lid portion 12 via the metal fitting 16, and the test object X is immersed in the liquid.

The control unit 151a pressurizes or depressurizes the inside of the pressure vessel 10, and measures the weight with the measuring unit 25. When pressurizing the inside of the pressure vessel 10, the rod-shaped member 15A is rotated, moved up and down, etc., before pressurization to remove any air bubbles adhering to the test object X. When depressurizing the inside of the pressure vessel 10, there is no need to rotate, move up and down, etc., the rod-shaped member 15, because air bubbles adhering to the test object X are removed as the pressure is reduced.

Since the test object X is attached to the pressure-resistant container 10 via the rod-shaped member 15A, when liquid penetrates the test object X, the weight measured by the measuring unit 25 increases. Therefore, the presence or absence of liquid penetration into the test object X can be detected based on the weight change measured by the measuring unit 25. Therefore, it is not necessary to check the presence or absence of liquid penetration by disassembling the test object X after the waterproof test. In addition, by continuously measuring the weight with the measuring unit 25 and continuously displaying the measurement results on the display unit 22, it is possible to detect in real time the point at which liquid penetration into the test object X occurred.

Figure 10 shows an example of a waterproof test result, where (A) shows a case where the inside of the pressure vessel 10 is continuously pressurized, and (B) shows a case where the inside of the pressure vessel 10 is pressurized in stages. Figure 11 shows an example of a waterproof test result, where (A) shows a case where the inside of the pressure vessel 10 is continuously depressurized, and (B) shows a case where the inside of the pressure vessel 10 is depressurized in stages. In Figures 10 and 11, the solid line indicates the internal pressure of the pressure vessel 10, and the dotted line indicates the weight measurement result in the measuring section 25.

The control unit 151a controls the internal pressure of the pressure-resistant vessel 10 so as to produce pressure changes as shown in Figs. 10 and 11. The control unit 151a also outputs the measurement results from the measurement unit 25 and the measurement results from the pressure gauge 40 in association with each other. The results are output to, as in the first embodiment, an input/output device 161 (e.g., an external monitor (not shown)) or a storage unit (e.g., ROM 153 or storage medium 163).

In this embodiment, the weight of the test object X is measured using the measuring unit 25, so that the weight of the test object X increases due to the infiltration of water into the test object. As shown in Figures 10(A) and 11(A), when the inside of the pressure-resistant container 10 is continuously pressurized or depressurized, it is possible to confirm the waterproof performance at the final pressure after pressurization or depressurization. Also, as shown in Figures 10(B) and 11(B), when the inside of the pressure-resistant container 10 is pressurized or depressurized in stages, it is possible to quantitatively evaluate how much pressure the test object X can withstand.

According to this embodiment, by checking the measurement results from the measuring unit 25 during the waterproof test, it is possible to check whether water has entered the test object. Therefore, it is not necessary to disassemble the test object X after the waterproof test, and a simple waterproof test method can be provided.

In addition, according to this embodiment, the weight of the test object X is measured directly using the measuring unit 25, which reduces the effects of environmental changes and allows accurate detection of the presence or absence of water ingress and accurate measurement of the amount of water ingress. For example, when the weight of the water tank 30 and water is measured by the measuring unit 20 as in the first embodiment, the measuring unit 20 measures the weight change due to water ingress as well as the weight change due to water evaporation. The amount of water evaporation is not constant because it is affected by the temperature, humidity, volume, etc. of the pressure-resistant vessel 10, and there is a risk of erroneous judgment of the presence or absence of water ingress. In contrast, by measuring the weight of the test object X using the measuring unit 25, water ingress can be accurately detected.

In this embodiment, a load cell is used as the measuring unit 25, but the form of the measuring unit 25 is not limited to this. Also, although the measuring unit 25 is provided between the rod-shaped member 15a and the rod-shaped member 15b, the position where the measuring unit 25 is provided is not limited to this. For example, the weight of the rod-shaped member 15 and the test object X may be measured using an electronic balance placed on the lid portion 12.

In addition, in this embodiment, the intrusion of liquid into the test object X while depressurizing or pressurizing is detected, but the method in which the pressure adjustment unit 60 adjusts the inside of the pressure-resistant container 10 is not limited to this. For example, if the test object X is provided with a vent valve that allows air to pass but does not allow liquid to pass through, liquid is likely to intrude into the test object X through the valve during pressurization. However, even if a vent valve is provided, liquid may intrude into the test object X through the joint between the valve and the housing during depressurization. Therefore, the pressure adjustment unit 60 may depressurize the inside of the pressure-resistant container 10 and then pressurize it, and during that time, the measurement unit 25 may continue to perform measurement. In this case, the pressure adjustment unit 60 may continuously depressurize the inside of the pressure-resistant container 10 as shown in FIG. 11(A) and then continuously pressurize the inside of the pressure-resistant container 10 as shown in FIG. 10(A), or may gradually depressurize the inside of the pressure-resistant container 10 as shown in FIG. 11(B) and then gradually pressurize the inside of the pressure-resistant container 10 as shown in FIG. 10(B). When pressurizing after depressurization, the pressure adjustment unit 60 may pressurize until the pressure returns to atmospheric pressure, or may pressurize until it reaches any pressure higher than atmospheric pressure.

The embodiment of the present invention has been described above in detail with reference to the drawings, but the specific configuration is not limited to this embodiment, and design changes and the like that do not deviate from the gist of the present invention are also included.

In the present invention, "approximately" is a concept that includes not only cases where it is strictly the same, but also errors and deformations that do not lose the identity. For example, an approximately cubic shape is not limited to cases where it is strictly a cube shape. In addition, for example, when expressing something as simply vertical, coincident, etc., it includes cases where it is approximately vertical, approximately coincident, etc., as well as cases where it is, for example, in the vicinity of A, and indicates that it is close to A and may or may not include A.

Reference Signs List 1, 2: Waterproof test device 10: Pressure-resistant container 11: Main body 11a: Bottom surface 11b: Side surfaces 11c, 11d: Pull-out section 11e: Air supply port 11f: Air exhaust port 12: Lid 12a: Convex section 13: Toggle clamp 15, 15A: Rod-shaped member 16: Metal fitting 19: Base 20, 25: Measurement section 21: Placement section 22: Display section 23: Power cable 24: Communication cable 30: Water tank 40: Pressure gauge 50: Pressurization section 51: Air compressor 52: Regulator 55: Pressure reduction section 60: Pressure adjustment section 151: CPU
151a: control unit 152: RAM
153: ROM
154: Input/Output Interface 155: Communication Interface 156: Media Interface 161: Input/Output Device 162: Network 163: Storage Medium

Claims (11)

a water tank containing a liquid in which the test object is immersed;
A pressure vessel in which the water tank is provided;
a rod-shaped member provided on an upper surface of the pressure-resistant container, the rod-shaped member having a lower end to which the test object is attached;
A pressure adjusting unit that pressurizes or depressurizes the inside of the pressure-resistant container;
A measuring unit for measuring the weight of the test object;
Equipped with
the pressure adjusting unit pressurizes or depressurizes the inside of the pressure-resistant container in a state in which the entire test object is provided inside the liquid and the test object is not in contact with the water tank;
The waterproof testing device according to claim 1, wherein the measuring unit continuously measures the weight of the pressure-resistant container while the inside of the pressure-resistant container is pressurized or depressurized by the pressure adjusting unit. The measuring unit is a weighing device,
The water tank is placed on the measurement unit,
The waterproof testing device according to claim 1 , wherein the water tank and the measuring unit are provided inside the pressure vessel. The waterproof testing device according to claim 1 , wherein the measuring portion is provided on the rod-shaped member. The waterproof testing device according to any one of claims 1 to 3, wherein the rod-shaped member is rotatably provided. The waterproof testing device according to any one of claims 1 to 4, wherein the rod-shaped member is provided so as to be movable in the up and down direction. The waterproof testing device according to any one of claims 1 to 5, further comprising a control unit that controls the pressure adjusting unit to gradually increase or decrease the pressure inside the pressure vessel. A pressure gauge for measuring the internal pressure of the pressure-resistant vessel is provided,
The waterproof testing device according to claim 6, wherein the control unit outputs a measurement result from the measurement unit in association with a measurement result from the pressure gauge. A display unit that displays the measurement result of the measurement unit,
The waterproof testing device according to any one of claims 1 to 7, wherein the display unit continuously displays the measurement results in the measurement unit. Providing a measurement unit and a water tank in which a liquid is stored inside a pressure-resistant container, and placing the water tank on the measurement unit;
A step of attaching a test object to a lower end of a rod-shaped member provided on an upper surface of the pressure-resistant container, and placing the test object entirely inside the liquid, and placing the test object in a state where the test object does not contact the water tank;
A step of measuring a weight by the measuring unit while pressurizing or depressurizing the inside of the pressure-resistant container;
A waterproof testing method comprising: Providing a water tank in which a liquid is stored inside a pressure-resistant container;
a step of attaching a test object to a lower end of a rod-shaped member provided on an upper surface of the pressure-resistant vessel, the rod-shaped member having a measuring section, and placing the entire test object inside the liquid and not contacting the water tank;
A step of measuring a weight by the measuring unit while pressurizing or depressurizing the inside of the pressure-resistant container;
A waterproof testing method comprising: a step of removing air bubbles adhering to the test object by rotating the rod-shaped member after placing the entire test object in the liquid;
11. The waterproof testing method according to claim 9, further comprising the step of removing air bubbles from the test object and then measuring the weight of the test object by the measuring section.

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