Housing Unit

Abstract

To provide a housing unit that has a water immersion detection function as a housing of an electronic apparatus requiring waterproof.SOLUTION: A housing unit comprises: a cabinet part that defines a fluid-tight accommodation space therein and accommodates an internal apparatus in the accommodation space; and a water immersion detection unit that detects that the accommodation space of the cabinet part is immersed in fluid. The cabinet part has sealing means that makes waterproof a seam, an entrance and exit port, and an opening and closing port. The water immersion detection unit includes electrolyte salt, and a conduction detection unit that detects a change in conductivity when the fluid contacts the electrolyte salt. The electrolyte salt is disposed, inside the cabinet part, on the inner side of the sealing means in the cabinet part.SELECTED DRAWING: Figure 2

Description

[Technical field]

[0001] The present invention relates to a housing unit. [Background technology]

[0002] Sensor devices (e.g., rotary encoders) used to control the drive of machine tools are often used in harsh environments where they are prone to being splashed with cutting fluid. Although such sensor devices (e.g., rotary encoders) are waterproof, water can get inside due to poor sealing or deterioration over time. Since water ingress inside the housing cannot be detected by appearance, users have no choice but to make maintenance plans based on the sensor device specifications and their own experience. This raises concerns that either excessive maintenance will result in excessive costs, or insufficient maintenance will cause the sensor to break down or malfunction. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Patent Publication No. 2019-117061 Summary of the Invention [Problem to be solved by the invention]

[0004] For example, Patent Document 1 proposes making the cover of a rotary encoder out of a light-transmitting resin, which makes it possible to visually check whether water has entered the inside of the cover. However, sensor devices such as rotary encoders and other control system electronic devices are installed in places that cannot be easily seen, such as inside mechanical devices (machine tools), which requires extensive maintenance work such as disassembling the mechanical devices (machine tools) to check the status of the sensor devices.

[0005] In addition, it is difficult to visually check whether or not there are droplets inside a small sensor device, and there is a risk that they may be overlooked even if you observe very carefully.

[0006] The present invention provides a housing unit having a water ingress detection function, which is suitable as a housing for electronic devices that require waterproofing. [Means for solving the problem]

[0007] The housing unit of the present invention comprises: A housing portion that defines a liquid-tight storage space therein and that stores an internal device in the storage space; a water ingress detection unit that detects that liquid has ingressed into the storage space of the housing unit, The housing has a sealing means for waterproofing joints, entrances, or openings; The water immersion detection unit is An electrolyte salt; a conductivity detection unit that detects a change in conductivity when a liquid comes into contact with the electrolyte salt, The electrolyte salt is disposed inside the housing, closer to the inside of the housing than the sealing means. It is characterized by:

[0008] In one embodiment of the present invention, A recess or a porous body is provided inside the housing part and on the inside of the housing part relative to the sealing means, The electrolyte salt is provided in the recess or the porous body. It is preferred.

[0009] In one embodiment of the present invention, The recess or the porous body is composed of a plurality of sub-partitions separated from each other, The electrolyte salt is provided in each of the sub-compartments, and the conductivity detector detects the conductivity of each of the sub-compartments. It is preferred.

[0010] In one embodiment of the present invention, The recesses or porous bodies are arranged in a plurality of rows in a direction from the side closer to the sealing means toward the inside of the housing. It is preferred.

[0011] In one embodiment of the present invention, The recesses or porous bodies are arranged in a plurality of rows in a direction from a side closer to the sealing means toward an inside of the housing, The gaps between adjacent sub-compartments in the row closer to the sealing means and the row farther from the sealing means are not aligned in a straight line. It is preferred.

[0012] In one embodiment of the present invention, The continuity detection unit executes a continuity detection operation at regular time intervals or before the internal device is operated. It is preferred.

[0013] The electronic device of the present invention comprises: The housing unit; and an internal device accommodated inside the housing unit. It is characterized by:

[0014] In one embodiment of the present invention, the internal device is a sensor module, the electronic device is a sensor device that detects a physical displacement of a measurement object, and the electronic device is built into a drive unit of a machine tool; The continuity detection unit performs a continuity detection operation in accordance with the timing of discharging the cutting fluid. It is preferred.

[0015] The method for controlling an electronic device of the present invention includes: A method for controlling the electronic device, comprising: the internal device is a sensor module, the electronic device is a sensor device that detects a physical displacement of a measurement object, and the electronic device is built into a drive unit of a machine tool; The continuity detection unit performs a continuity detection operation in accordance with the timing of discharging the cutting fluid. It is characterized by: [Brief description of the drawings]

[0016] [Figure 1] FIG. 1 is an external perspective view of a rotary encoder. [Diagram 2] FIG. 2 is a schematic cross-sectional view of a rotary encoder. [Diagram 3] FIG. [Figure 4] 13 is a diagram illustrating a state in which water submersion detection electrodes are provided at predetermined positions in the first water submersion detection groove. FIG. [Diagram 5] 11A and 11B are diagrams illustrating an example of the arrangement of water immersion detection grooves on the upper surface of the base portion. [Figure 6] 11A and 11B are diagrams illustrating an example of the arrangement of water immersion detection grooves on the upper surface of the base portion. [Figure 7] FIG. 7 is an enlarged view of FIG. [Figure 8] 1 is a diagram illustrating a state in which a porous body carrying an electrolyte salt is disposed inside a housing portion. FIG. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0017] DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be illustrated and described with reference to the reference numerals given to the various elements in the drawings. (First embodiment) A first embodiment of a housing unit of the present invention will be described. The present invention relates to a housing unit for an electronic device that requires waterproofing. An example of the electronic device is a rotary encoder, which is a sensor device. The first embodiment will be described using a rotary encoder as an example.

[0018] FIG. 1 is a perspective view of the appearance of a rotary encoder 100. FIG. FIG. 2 is a schematic cross-sectional view of the rotary encoder 100. The rotary encoder 100 includes a rotation input shaft 110 (movable body), a sensor module 120 as an internal device, and a housing unit 200 that houses the sensor module 120.

[0019] In this example, rotary encoder 100 is used, and the movable body that displaces together with the object is rotary input shaft 110. The tip of rotary input shaft 110 is connected to the detection object (measurement object).

[0020] The sensor module 120 of the rotary encoder 100 itself is known. The sensor module 120 of the rotary encoder 100 is accommodated in the housing unit 200 and has a rotation detection section 130 that detects the rotation angle of the rotation input shaft 110 . The rotation detection unit 130 has a rotor 131 that is provided so as to rotate integrally with the rotation input shaft 110 , and a stator 132 that detects the rotation of the rotor 131 . For example, a scale consisting of a periodic pattern is provided on the rotor 131, and changes in the scale pattern that occur with rotation are read by a detector on the stator 132 side. Known detection methods include photoelectric, capacitance, and magnetic (electromagnetic induction). An encoder signal (e.g., a sine wave) is output from the detector on the stator 132 side, and the rotation is determined by calculation based on the encoder signal. The calculation circuit 133 that performs such calculation may be incorporated in the sensor module 120, or may be located outside the rotary encoder 100 (outside the housing unit 200).

[0021] Here, it is assumed that a circuit board is mounted in the electrical equipment section within the sensor module 120, and that the arithmetic circuit 133 is also incorporated in this circuit board.

[0022] The housing unit 200 accommodates the sensor module 120 in a liquid-tight manner. The housing unit 200 includes a case section 210 and a water entry detection section 300 .

[0023] The structure of the housing 210 is not limited to a specific structure as long as it defines a liquid-tight internal space by a sealing means. Here, as an example, a housing part 210 having a base part 220 and a cap part 270 is taken. FIG. 3 is a perspective view of the base portion 220. As shown in FIG. The base portion 220 is a disk-shaped flat plate. The cap portion 270 is cylindrical (topped cylindrical) with a closed upper end surface and an open lower end surface, and has a flange portion 271 extending radially outward at the lower end of the cylindrical portion.

[0024] For the sake of convenience in explaining the structure, the terms "upper" and "lower" are used, but they do not limit the installation posture (direction) of the rotary encoder 100 when it is actually used.

[0025] The cap portion 270 is placed on the upper surface side of the base portion 220, and an accommodation space is defined between the base portion 220 and the cap portion 270. At this time, the flange portion 271 fits to the outer edge portion of the base portion 220 with a predetermined area, and the seam between the base portion 220 and the cap portion 270 is closed. Furthermore, a circular sealing groove 230 is provided on the upper surface of the base portion 220 near the outer edge of the base portion 220 so as to completely surround (encircle) the inside. An O-ring 231 is fitted into this groove as a sealing material.

[0026] Here, the flange portion 271 and the O-ring 231 constitute a sealing means for liquid-tightly sealing between the base portion 220 and the cap portion 270, but the sealing means may also be a waterproof tape that seals the flange portion 271 and the base portion 220 from the outside. Instead of or in addition to the O-ring 231, a resin (e.g., an adhesive) interposed between the flange portion 271 and the base portion 220 may also serve as the sealing means.

[0027] Further, an insertion hole 260 for inserting the rotation input shaft 110 is provided in approximately the center of the base portion 270. When the insertion hole 260 is viewed in a direction from the inside to the outside of the accommodation space, the insertion hole 260 has a stepped shape with an increased diameter. The large diameter portion of insertion hole 260 closer to the outside is referred to as large diameter hole portion 261, and the small diameter portion of insertion hole 260 closer to the inside is referred to as small diameter hole portion 262. The plane between large diameter hole portion 261 and small diameter hole portion 262 is referred to as step surface 263.

[0028] An oil seal 264 (sealing means) is interposed between the inner wall of the large diameter hole portion 261 and the rotary input shaft 110.

[0029] The water submersion detection unit 300 includes water submersion detection grooves (recesses) 301-304, an electrolyte salt 310, and a conductivity detection unit 320.

[0030] The arrangement of the water ingress detection grooves 301-304 will now be described. A circular groove is provided on the upper surface of the base part 220, closer to the inside of the housing part 210 than the sealing groove 230, so as to completely surround (encircle) the inside. This groove is referred to as a first water immersion detection groove 301. A circular groove is provided on the underside of flange portion 271 of cap portion 270, closer to the inside than the opposing position of O-ring 231, so as to completely surround (encircle) the inside. This groove is referred to as second water submersion detection groove 302.

[0031] Further, the insertion hole 260 is provided with a third water submersion detection groove 303 and a fourth water submersion detection groove 304 . A circular groove is provided in the step surface 263 of the insertion hole 260 so as to completely surround (encircle) the insertion hole 260. This groove is referred to as a third water intrusion detection groove 303. A circular groove is provided along the circumferential direction on the inner wall of the large diameter hole portion 261 of the insertion hole 260. This groove is referred to as a fourth water submersion detection groove 304.

[0032] The electrolyte salt 310 is applied to the inner surfaces of the first water submersion detection groove 301, the second water submersion detection groove 302, the third water submersion detection groove 303 and the fourth water submersion detection groove 304. The electrolyte salt 310 may be applied to the entire side and bottom surfaces (side walls and bottom surface) of the groove, or may be applied only to the side surfaces of the groove, or may be applied only to the bottom surface of the groove. Examples of the electrolyte salt 310 include KCl (potassium chloride), NaCl (sodium chloride), and KOH (potassium hydroxide).

[0033] When applying the electrolyte salt 310 to the inner surfaces of the grooves 301-304, a sticky resin may be applied to the inner surfaces of the grooves 301-304, and then the electrolyte salt 310 may be applied (attached) thereto. Alternatively, the electrolyte salt 310 may be mixed with a sticky resin, and the resin may be applied to the inner surfaces of the grooves. After applying the electrolyte salt 310, it is dried to completely remove moisture.

[0034] The continuity detection unit 320 includes a pair of two conducting wires 330 and a current detection circuit 350 . A plurality of pairs of two conducting wires 330 are prepared, and the tips of the pair of conducting wires 330 are fixed (attached) to the inner surface of the groove with the tips spaced apart from each other. The distal end of the spaced apart conductor 330 is referred to as a water detection electrode 340 . The water submersion detection electrode 340 is disposed at a position where it is desired to detect water submersion. Fig. 4 is a diagram showing an example of the state in which the water submersion detection electrode 340 is disposed at a predetermined position of the first water submersion detection groove 301.

[0035] In addition, if the base portion 220 or the cap portion 270 itself is a conductor, the water detection electrode 340 and the base portion 220, and the water detection electrode 340 and the cap portion 270 are insulated from each other by, for example, placing an insulator (insulating sheet) between them.

[0036] The base end side of the conducting wire 330 is connected to a current detection circuit 350 . Although a current detection circuit 350 is used here, it is sufficient if the continuity of the pair of conductors 330 can be detected, and a voltage detection circuit may also be used. The current detection circuit 350 may be a known circuit that can be configured with a small battery and a simple IC. The current detection circuit 350 is installed at a predetermined location inside the housing 210. Here, the current detection circuit 350 is also incorporated into the circuit board inside the sensor module 120.

[0037] The position on the inner surface of the groove where the water submersion detection electrode 340 is fixed (attached) is arbitrary. If water accumulates on the bottom surface of the groove, it would be best to fix the water submersion detection electrode 340 to the bottom surface of the groove. Alternatively, if it is assumed that water will flow downward, it would be best to install the water submersion detection electrode 340 on a surface that is lower in the groove, taking into account the installation posture of the rotary encoder 100.

[0038] (Water ingress detection operation) The current detection circuit 350 applies a voltage to the water submersion detection electrodes 340 in sequence at regular time intervals, for example, to check whether or not there is electrical continuity between the water submersion detection electrodes 340 . When water intrudes from outside the housing 210 beyond the sealing means, the water enters the water ingress detection grooves 301, 302, 303, and 304 located immediately inside the sealing means. When the electrolyte salt 310 comes into contact with water, the electrolyte water gradually accumulates in the grooves 301, 302, 303, and 304. When the electrolyte water comes into contact with the water ingress detection electrodes 340, electrical continuity is established between the water ingress detection electrodes 340. When there is no water ingress, the ions of the electrolyte salt do not move, so the conductivity is almost zero and there is no continuity. However, when liquid comes into contact with the electrolyte salt due to water ingress, the ions eluted from the electrolyte salt move, so the conductivity suddenly increases. In other words, the water ingress detection operation detects the presence or absence of water ingress by detecting the change in the conductivity of the electrolyte salt depending on the presence or absence of liquid.

[0039] The rotary encoder 100 is, for example, a sensor device incorporated in a drive unit of a machine tool. A machine tool has a function of discharging cutting fluid at an appropriate timing. Therefore, in cases where the timing of discharging cutting fluid is managed by electrical control, a continuity detection operation (continuity test, water intrusion test) of the water entry detection electrode 340 may be performed in accordance with the timing of discharging cutting fluid (for example, a predetermined time (for example, several seconds) after discharging cutting fluid). If any of the water ingress detection electrodes 340 is conductive beyond a predetermined threshold, it may be determined that the water ingress exceeds an allowable level, and an alarm signal may be sent to the outside from the conductivity detection unit 320. The alarm signal is conveyed to the user by sound or message, and the occurrence of the alarm is recorded as a log in a predetermined memory (such as a recording device of an external PC).

[0040] According to the first embodiment having such a configuration, as a water ingress detection operation, it is possible to automatically detect whether or not water is in the casing 210 by performing a continuity detection operation (continuity test, water ingress test) of the water ingress detection electrode 340 at a predetermined timing (after a predetermined time). Then, maintenance of the rotary encoder (electronic device) 100 can be performed before the sensor module (internal device) 120 in the casing 210 breaks down or malfunctions. This makes it possible to reduce the number of maintenance steps and costs, and also to achieve a stable, long life for the rotary encoder (electronic device) 100.

[0041] Second embodiment In the first embodiment, the water detection grooves 301, 302, 303, and 304 are each formed into one continuous circle. In a second embodiment, the water ingress detection groove may be divided into a plurality of sub-compartments that are separated from each other. Furthermore, the water ingress detection groove may be provided in a plurality of rows in a direction from the side closer to the sealing toward the inside of the housing part 210.

[0042] 5 and 6 are examples of the arrangement of water submersion detection grooves on the upper surface of base portion 220. In Fig. 5, two rows of water submersion detection grooves are provided inside sealing groove 230. Of the two rows of water submersion detection grooves, the row closer to the outside is referred to as first row of water submersion detection grooves 401, and the row closer to the inside is referred to as second row of water submersion detection grooves 402.

[0043] The first row of water submersion detection groove array 401 and the second row of water submersion detection groove array 402 are each separated into a plurality of sub-partitions 430. An electrolyte salt 310 is applied to each sub-partition 430, and a water submersion detection electrode 340 is disposed therein. Note that the conductor wire 330 (water submersion detection electrode 340) is omitted in Figs. 5 and 6.

[0044] 5, looking at the size of each sub-partition 430, the sub-partition 430 constituting the first row of groove array 401 for detecting water submersion is slightly larger than the sub-partition 430 constituting the second row of groove array 402 for detecting water submersion. If the amount of water required to detect continuity is somewhat related to the size of the sub-partition 430, the water submersion detection in the first row can be set to be somewhat slow, and the water submersion detection in the second row can be set to be sensitive.

[0045] In Fig. 5, the gaps between adjacent sub-divisions 430 in the first row and the gaps between adjacent sub-divisions 430 in the second row are linear. In contrast, for example, as illustrated in Fig. 6, the gaps between adjacent sub-divisions 430 in the first row and the gaps between adjacent sub-divisions 430 in the second row may not be aligned linearly. In other words, if an imaginary line is drawn through the gaps between adjacent sub-divisions 430 in the first row, this imaginary line will intersect with the sub-divisions 430 in the second row.

[0046] FIG. 7 is an enlarged view of FIG. Now, if a bisector L1 is drawn passing through the gap between adjacent sub-divisions 430 in the first row, this bisector L1 will intersect with the second row of sub-divisions 430. Furthermore, even if imaginary straight lines L2 and L3 are drawn parallel to the bisector L1 and passing through the gap between the sub-divisions 430 in the first row, the imaginary straight lines L2 and L3 will also intersect with the second row of sub-divisions 430.

[0047] Alternatively, if an imaginary line L4 is drawn connecting the gap between the sub-division sections 430 in the first row and the gap between the sub-division sections 430 in the second row, this imaginary line L4 will intersect with the sub-division sections 430.

[0048] This means that even if any droplets pass through the gaps between the subcompartments 430 in the first row, it is expected that these droplets will enter the subcompartments 430 in the second row and come into contact with the electrolyte salt 310.

[0049] In the second embodiment, the multiple rows of water ingress detection grooves 401, 402 have multiple sub-partitions 430. As in the first embodiment, the water ingress detection operation involves performing a continuity detection operation (continuity test, water ingress test) of the water ingress detection electrodes 340 at regular intervals or at a predetermined timing, but a more precise determination can be made by combining the location where water ingress is detected and the level of water ingress.

[0050] For example, a first level alarm may be issued when flooding is detected in the first row sub-compartment 430, and a second level alarm may be issued when flooding is detected in the second row sub-compartment 430. Furthermore, even when flooding is detected in the second row sub-compartment 430, multiple current level thresholds may be set so that alarm information may be issued in stages, such as light, medium, and heavy. The user may recognize that there is a first level alarm and take notice, but may decide that replacement or overhaul of the rotary encoder 100 is not yet necessary. It is advisable for the user to check the alarm log, such as the number of first and second level alarms and their types, and to plan when to replace the rotary encoder 100.

[0051] Sensor devices such as the rotary encoder 100 that are expected to be used in harsh environments incorporate measures against water ingress (such as protective materials, water repellents, and robust detection algorithms) to some extent, so it can be said that it is better to continue using the device until the specified level of water ingress occurs, rather than disassembling and repairing it or performing maintenance. However, until now, sensor-based electronic devices such as the rotary encoder 100 did not have the function to automatically detect water ingress or record the water ingress level in a log, and users had no choice but to make maintenance plans based on the specifications of the sensor device and their own experience. This would result in either excessive costs due to excessive maintenance or failure of the sensor device due to insufficient maintenance, but it is difficult to appropriately revise maintenance plans in a situation where detailed logs of water ingress are not kept. In this regard, according to the present embodiment, flooding can be automatically and electrically detected, and even flooding levels that do not require replacement can be recorded in a log. Therefore, appropriate maintenance can be performed according to the usage status of each sensor device (rotary encoder 100).

[0052] Third embodiment In the above first and second embodiments, the electrolyte salt 310 is arranged (applied) in the water immersion detection grooves 301-304. However, instead of arranging the electrolyte salt 310 in the grooves (recesses) 301-304, a porous body 510 may be used. The porous body 510 may be, for example, a foamable resin (such as polyurethane resin). The electrolyte salt 310 is placed in the porous body 510, and the porous body 510 is placed inside the sealing means. The water immersion detection electrode 340 is attached to the porous body 510.

[0053] To support the electrolyte salt 310 in the porous body 510, the porous body 510 is impregnated with the electrolyte salt 310 and then dried. Alternatively, a sticky resin may be applied to or impregnated into the porous body 510, and the electrolyte salt 310 may be applied (attached) thereto. Alternatively, the electrolyte salt 310 may be mixed with a sticky resin, and the resin may be impregnated into the porous body 510. The electrolyte salt 310 is dried to completely remove moisture.

[0054] 8 shows an example of a state in which a porous body 510 carrying an electrolyte salt 310 is disposed inside the housing 210. The porous body 510 is appropriately disposed inside the O-ring 231 and the oil seal 264, and a water entry detection electrode 340 is attached thereto. In line with the intent described in the second embodiment, the porous body may be disposed in multiple rows, the porous body may be separated into sub-partitions, or the size of the porous body (sub-partitions) may be varied.

[0055] Placing the electrolyte salt 310 in a groove (recess) requires processing a groove in the housing 210 of the rotary encoder 100, but the porous body 510 can be easily added to an existing rotary encoder 100. In addition, by attaching the porous body 510 to a required location depending on the state (installation posture) in which the rotary encoder 100 is used, the location of water intrusion detection can be changed as appropriate according to the needs of the user.

[0056] The present invention is not limited to the above-described embodiment, and can be modified as appropriate without departing from the spirit and scope of the present invention. In the above embodiment, the rotary encoder 100 is taken as an example, but the sensor device (electronic device) is not limited to the rotary encoder 100 and may be a linear encoder. In the above embodiment, the rotation input shaft 110 is provided so as to pass through the base portion 220 , but the rotation input shaft 110 may be provided so as to protrude from the cap portion 270 . Furthermore, in the above embodiment, a sensor device that detects a physical displacement of a measurement object is taken as an example, but the sensor device may be a motor (actuator) that generates a physical displacement in a driven object. The housing unit of the present invention can be used not only as an encoder or actuator, but also as a housing for any electronic device that requires waterproofing.

[0057] In the above embodiment, the continuity detection operation (continuity test, water ingress test) involves applying a voltage to the water ingress detection electrodes to check for continuity between them, but if dissimilar electrodes (e.g. zinc and copper) are used, the water ingress detection electrodes themselves become batteries, so there is no need to apply a separate voltage to the continuity detection operation (continuity test, water ingress test) at regular intervals or with a specified timing, and water ingress test can be performed in accordance with the timing of water ingress with almost no additional energy consumption. (It is recommended that the area of ​​the electrodes is made relatively large.) [Explanation of symbols]

[0058] 100 Rotary encoder (electronic device, sensor device) 110 rpm input shaft 120 Sensor module (internal equipment) 130 Rotation detector 131 Rotor 132 Stator 133 Arithmetic circuit 200 housing units 210 Housing 220 Base 230 Sealing groove 231 O-ring 260 Insertion hole 261 Large diameter hole 262 Small diameter hole 263 Step Surface 264 Oil seal 270 Cap section 271 Flange part 300 Water ingress detection unit 301 First water ingress detection groove 302 Second water ingress detection groove 303 Third water ingress detection groove 304 4th Water Ingress Detection Groove 310 Electrolyte Salts 320 Continuity detection unit 330 Conductor 340 Water Intrusion Detection Electrode 350 Current detection circuit 401 First row of water ingress detection grooves 402 Second row of water ingress detection grooves 430 Subdivision 510 Porous bodies

Claims

1. A housing portion that defines a liquid-tight storage space therein and that stores an internal device in the storage space; a water ingress detection unit that detects that liquid has ingressed into the storage space of the housing unit, The housing has a sealing means for waterproofing joints, entrances, or openings; The water immersion detection unit is An electrolyte salt; a conductivity detection unit that detects a change in conductivity when a liquid comes into contact with the electrolyte salt, A recess or a porous body is provided on the inside of the housing portion relative to the sealing means, The electrolyte salt is provided in the recess or the porous body, The recesses or porous bodies are arranged in a plurality of rows in a direction from the side closer to the sealing means toward the inside of the housing. A housing unit characterized by:

2. In the housing unit according to claim 1, The recess or the porous body is composed of a plurality of sub-partitions separated from each other, The electrolyte salt is provided in each of the sub-compartments, and the conductivity detector detects the conductivity of each of the sub-compartments. A housing unit characterized by:

3. In the housing unit according to claim 2, The gaps between adjacent sub-compartments in the row closer to the sealing means and the row farther from the sealing means are not aligned in a straight line. A housing unit characterized by:

4. In the housing unit according to any one of claims 1 to 3, The continuity detection unit executes a continuity detection operation at regular time intervals or before the internal device is operated. A housing unit characterized by:

5. A housing unit according to any one of claims 1 to 4; and an internal device accommodated inside the housing unit.

6. The electronic device according to claim 5, The internal device is a sensor module, The electronic device is a sensor device that detects a physical displacement of a measurement object, and the electronic device is built into a drive unit of a machine tool. The continuity detection unit performs a continuity detection operation in accordance with the timing of discharging the cutting fluid.

1. An electronic device comprising:

7. An electronic device comprising a housing unit and an internal device accommodated inside the housing unit, The housing unit comprises: A housing portion that defines a liquid-tight storage space therein and that stores an internal device in the storage space; a water ingress detection unit that detects that liquid has ingressed into the storage space of the housing unit, The housing has a sealing means for waterproofing joints, entrances, or openings; The water immersion detection unit is An electrolyte salt; a conductivity detection unit that detects a change in conductivity when a liquid comes into contact with the electrolyte salt, the electrolyte salt is disposed inside the housing part, on the inner side of the housing part relative to the sealing means, The internal device is a sensor module, The electronic device is a sensor device that detects a physical displacement of a measurement object, and the electronic device is built into a drive unit of a machine tool. The continuity detection unit performs a continuity detection operation in accordance with the timing of discharging the cutting fluid.

1. An electronic device comprising:

8. A method for controlling an electronic device according to claim 5, comprising: The internal device is a sensor module, The electronic device is a sensor device that detects a physical displacement of a measurement object, and the electronic device is built into a drive unit of a machine tool; The continuity detection unit performs a continuity detection operation in accordance with the timing of discharging the cutting fluid.

23. A method for controlling an electronic device comprising:

9. A method for controlling an electronic device comprising a housing unit and an internal device accommodated inside the housing unit, comprising: The housing unit comprises: A housing portion that defines a liquid-tight storage space therein and that stores an internal device in the storage space; a water ingress detection unit that detects that liquid has ingressed into the storage space of the housing unit, The housing has a sealing means for waterproofing joints, entrances, or openings; The water immersion detection unit is An electrolyte salt; a conductivity detection unit that detects a change in conductivity when a liquid comes into contact with the electrolyte salt, the electrolyte salt is disposed inside the housing part, on the inner side of the housing part relative to the sealing means, the internal device is a sensor module, the electronic device is a sensor device that detects a physical displacement of a measurement object, and the electronic device is built into a drive unit of a machine tool; The continuity detection unit performs a continuity detection operation in accordance with the timing of discharging the cutting fluid.

23. A method for controlling an electronic device comprising:

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