Measuring equipment

Abstract

To facilitate a replacement work of a seal member of a movable member in contact with liquid in a measurement device provided with an immersion type detector.SOLUTION: A measurement device 1, 1A has a detector 100, 100A that is immersed in sample water W to detect water quality. The detector comprises: a light emitting unit 21; an outgoing window 22; an incidence window 32; a light reception unit 31; a moving member 63, 63A; a drive unit 40, 40A; a housing 10, 10A; and a transmission unit 50, 50A that transmits motive power from the drive unit to the moving member. The housing includes a unit attachment hole 112h2, 113Ah. The transmission unit includes: a shaft part 508, 508A that performs a motive work based on the motive power; an accommodation cylinder part 501, 501A that accommodates a portion of the shaft part in such a way to allow the shaft part to move; internal seal members 504, 506, 509 that encapsulate fluid-tightly a space between the shaft part accommodated in the accommodation cylinder part and the accommodation cylinder part; and an external seal member 503 that encapsulates liquid-tightly a space between the accommodation cylinder and the unit attachment hole. The transmission unit is detachably attached to the unit attachment hole.SELECTED DRAWING: Figure 3

Description

[Technical Field]

[0001] The present invention relates to a measurement device. [Background technology]

[0002] Measuring devices that use light to measure water quality (e.g., organic pollutants, turbidity, suspended solids (SS), etc.) are used to measure the quality of environmental waters such as lakes, rivers, and seawater, or industrial wastewater. Such measuring devices are equipped with a detector that detects light transmitted through or scattered by the water to be measured (hereinafter referred to as "sample water"), and measure the water quality based on the detection results of the detector. Generally, when water quality is measured continuously, a measuring device equipped with an immersion-type detector, in which the detector is installed below the surface of the sample water, is used (see, for example, Patent Document 1 and Non-Patent Document 1).

[0003] The measuring devices disclosed in Patent Document 1 and Non-Patent Document 1 include a light-emitting unit that emits light, an exit window that emits light from the light-emitting unit, an entrance window into which the light emitted from the exit window enters, and a light-receiving unit that receives the light that enters the entrance window. A cell space filled with sample water is formed between the exit window and the entrance window. The measuring device measures the water quality (turbidity) of the sample water by emitting light into the sample water in the cell space and detecting light that has passed through the sample water or light scattered by the sample water. When the measuring device is used continuously, contaminants contained in the sample water adhere and accumulate on the exit window and / or entrance window. As a result, the light detection ability of the measuring device decreases, and the accuracy of water quality measurement decreases. Therefore, the measuring device is equipped with a removal mechanism that removes contaminants that have adhered to the exit window and entrance window.

[0004] The removal mechanism of Patent Document 1 includes a drive unit, a rotating shaft, and a rubber wiper. The drive unit is housed in the detector housing and supplies power to move the rubber wiper. The rotating shaft is connected to the drive unit and transmits power from the drive unit to the rubber wiper. The lower end of the rotating shaft protrudes into the cell space. The rubber wiper is disposed in the cell space and attached to the lower end of the rotating shaft. The rubber wiper is configured to move back and forth in the circumferential direction of the rotating shaft (reciprocating rotational motion), thereby crossing the space between the exit window and the entrance window (part of the cell space) while making contact with the exit window and the entrance window. In this removal mechanism configured in this manner, contaminants adhering to each of the exit window and the entrance window are removed as the rubber wiper moves back and forth.

[0005] The removal mechanism of Non-Patent Document 2 comprises a drive unit, a vertical movement shaft, and a rubber wiper. The drive unit is housed in the detector housing and supplies power to move the rubber wiper. The vertical movement shaft is connected to the drive unit and transmits power from the drive unit to the rubber wiper. The lower end of the vertical movement shaft protrudes into the cell space. The rubber wiper is disposed in the cell space and attached to the lower end of the vertical movement shaft. As the rubber wiper moves back and forth in the vertical direction together with the vertical movement shaft (reciprocating up and down motion), contaminants adhering to the exit window and the entrance window are removed, similar to the rubber wiper of Patent Document 1.

[0006] As mentioned above, the detector is installed below the water surface, and part of the rotating shaft (vertical movement shaft), which is a movable part, protrudes into the cell space. Therefore, the area around the rotating shaft (vertical movement shaft), which is a movable part, is liquid-tightly sealed with multiple seals to prevent sample water from entering the housing. When the measuring device is used continuously, the seals of the movable parts in particular are prone to deterioration. Therefore, these seals must be replaced periodically.

[0007] When replacing a seal member, the rotating shaft and the multiple seal members that contact the rotating shaft must be removed from the detector. Furthermore, removing these members requires disconnecting the rotating shaft, which is a movable member, from the drive unit and removing the member that holds the rotating shaft (the vertical movement shaft). In other words, replacing a detector's seal members requires a large number of parts, and the replacement process takes time and effort. Furthermore, many seal members have a specific installation orientation. If the installation orientation is incorrect, not only will the seal member need to be replaced again, but sample water may seep into the housing, causing detector failure. [Prior art documents] [Patent documents]

[0008] [Patent Document 1] Japanese Patent Application Laid-Open No. 2014-222187 [Non-patent literature]

[0009] [Non-Patent Document 1] SPECIFICATION SHEET "Organic Pollution Monitor UV Meter OPM-1610 Type," DKK-TOA Corporation, November 29, 2019, pp. 1-12 Summary of the Invention [Problem to be solved by the invention]

[0010] An object of the present invention is to facilitate the replacement of a seal member of a movable member that comes into contact with liquid in a measuring device equipped with an immersion-type detector. [Means for solving the problem]

[0011] The measuring device according to the present invention is a measuring device for measuring the quality of sample water using light, and includes a detector that is at least partially immersed in the sample water to detect the water quality, and the detector includes a light emitting unit that emits light, an exit window that emits light from the light emitting unit, an entrance window into which the light emitted from the exit window enters, a light receiving unit that receives the light that has entered the entrance window, a moving member that moves within the sample water that fills the cell space between the exit window and the entrance window, a driving unit that supplies power to move the moving member, and a detector that houses the light source, the light receiving unit, and the driving unit. and a transmission unit that transmits power from the drive unit to the moving member, the housing having a unit mounting hole arranged to face the cell space, the transmission unit having a shaft that moves based on the power, a casing that houses a part of the shaft so that the shaft can move, an internal seal member that is housed in the casing and provides a liquid-tight seal between the shaft and the casing, and an external seal member that provides a liquid-tight seal between the casing and the unit mounting hole, and the transmission unit is detachably mounted to the unit mounting hole. [Effects of the Invention]

[0012] According to the present invention, in a measuring device equipped with an immersion-type detector, the work of replacing a seal member of a movable member that comes into contact with liquid can be facilitated. [Brief explanation of the drawings]

[0013] [Figure 1] 1 is a schematic diagram showing an embodiment of a measuring device according to the present invention. [Figure 2] FIG. 2 is a side view of a detector provided in the measurement device of FIG. [Figure 3] 3 is an enlarged cross-sectional view of the detector of FIG. 2 taken along line AA. [Figure 4] 3 is an enlarged cross-sectional view of a transmission unit included in the detector of FIG. 2. FIG. [Figure 5] FIG. 5 is an enlarged exploded cross-sectional view of the transmission unit of FIG. 4. [Figure 6] 3 is an enlarged cross-sectional view of the detector taken along line BB in FIG. 2. [Figure 7]5A and 5B are cross-sectional views showing an example of the removal of the transmission unit in FIG. 4 in chronological order, where (a) shows the state in which the second cover provided on the detector in FIG. 2 has been removed, (b) shows the state in which the drive unit provided on the detector has been removed, and (c) shows the state in which the transmission unit and wiper unit provided on the detector have been removed. [Figure 8] FIG. 10 is a schematic diagram showing another embodiment of a measuring device according to the present invention. [Figure 9] FIG. 9 is a side view of a detector provided in the measurement device of FIG. 8. [Figure 10] 10 is a cross-sectional view of the detector of FIG. 9 taken along line CC. [Figure 11] 10 is an enlarged cross-sectional view of the detector of FIG. 9 taken along line CC. [Figure 12] 10 is an enlarged cross-sectional view of a transmission unit included in the detector of FIG. 9. FIG. [Figure 13] FIG. 13 is an enlarged exploded cross-sectional view of the transmission unit of FIG. 12. [Figure 14] 12 is an enlarged cross-sectional view of the detector of FIG. 9 taken along line DD of FIG. 11. [Figure 15] 13A and 13B are cross-sectional views showing an example of the removal of the transmission unit in FIG. 12 in chronological order, where (a) shows the state in which the third cover, drive unit, transmission unit, and wiper unit provided on the detector in FIG. 9 have been removed, and (b) shows the state in which the transmission unit and wiper unit provided on the same detector have been removed. DETAILED DESCRIPTION OF THE INVENTION

[0014] Hereinafter, an embodiment of a measuring device according to the present invention (hereinafter referred to as "the device") will be described with reference to the drawings.

[0015] ●Measuring device (1)● ●Configuration of measuring device (1) FIG. 1 is a schematic diagram showing an embodiment of the present device.

[0016] The device 1 uses light to measure the water quality of a water sample W. The device 1 is, for example, an absorbance measurement device that uses UV (ultraviolet) light to measure the turbidity of the water sample W. The device 1 includes a detector 100 and a converter 200.

[0017] The "sample water W" is water whose quality is to be measured by the device 1. The sample water W is, for example, wastewater from a factory.

[0018] The sample water in the present invention is not limited to wastewater from a factory, and may be, for example, environmental water such as lake water, river water, or seawater.

[0019] The detector 100 detects the water quality (absorbance) of the water sample W by emitting light to the water sample W and receiving the light that has passed through the water sample W. The detector 100 is installed below the surface of the water sample W. That is, the detector 100 is immersed in the water sample W during use. The configuration of the detector 100 will be described later. The detector 100 is electrically connected to the converter 200 via a cable C.

[0020] In the following description, "above the detector 100" refers to the direction in which the water surface is located when the detector 100 is immersed in the water sample W (above the paper in FIG. 1). "Below the detector 100" refers to the opposite direction from above (below the paper in FIG. 1).

[0021] The converter 200 calculates and converts the water quality (organic pollutants, turbidity, SS concentration, etc.) of the sample water W based on the absorbance detected by the detector 100. The converter 200 is installed at a position higher than the water surface, for example, above the detector 100.

[0022] Detector (1) configuration FIG. 2 is a side view of the detector 100. FIG. 3 is an enlarged cross-sectional view of the detector 100 taken along line AA in FIG. For the sake of convenience, some cross sections are not shown in FIG.

[0023] The detector 100 includes a housing 10 , a light emitting unit 20 , a light receiving unit 30 , a driving unit 40 , a transmission unit 50 , and a wiper unit 60 .

[0024] The housing 10 houses the light-emitting unit 20, the light-receiving unit 30, the drive unit 40, and the transmission unit 50. The housing 10 is a generally cylindrical body extending in the vertical direction. The housing 10 includes a unit holding portion 11, cylindrical first and second covers 12 and 13, and a mounting hole seal member 14.

[0025] The unit holder 11 holds the light emitting unit 20, the light receiving unit 30, and the transmission unit 50. The unit holder 11 includes a first holder 111, a second holder 112, and two pillars 113 and 114.

[0026] The first holding portion 111 holds the light-emitting unit 20. The first holding portion 111 is cylindrical with a bottom. The first holding portion 111 has a window mounting hole 111h1 and a support hole 111h2. The window mounting hole 111h1 is disposed in the ceiling wall 111a and penetrates the ceiling wall 111a. The support hole 111h2 is disposed on the upper surface of the ceiling wall 111a. The window mounting hole 111h1 and the support hole 111h2 are disposed so as to face a cell space CS, which will be described later.

[0027] The second holding portion 112 holds the light receiving unit 30 and the transmission unit 50. The second holding portion 112 is cylindrical with a bottom. The second holding portion 112 includes a window mounting hole 112h1 and a unit mounting hole 112h2. The window mounting hole 112h1 and the unit mounting hole 112h2 are disposed in the bottom wall 112a and penetrate the bottom wall 112a. The window mounting hole 112h1 and the unit mounting hole 112h2 are disposed so as to face a cell space CS, which will be described later.

[0028] The two pillars 113, 114 connect the first holding part 111 and the second holding part 112 so that the upper surface of the ceiling wall 111a and the lower surface of the bottom wall 112a face each other. A cell space CS is formed between the ceiling wall 111a and the bottom wall 112a and is filled with sample water W (see FIG. 1; the same applies below).

[0029] The two window mounting holes 111h1 and 112h1 are arranged on the same imaginary axis along the vertical direction, that is, the two window mounting holes 111h1 and 112h1 are arranged to face each other with the cell space CS therebetween.

[0030] The first cover 12 is liquid-tightly and detachably attached to the first holding part 111. As a result, the first holding part 111 and the first cover 12 form a first housing space S1 in which a light source 21 (described later) is housed.

[0031] The second cover 13 is liquid-tightly and detachably attached to the second holding portion 112. As a result, the second holding portion 112 and the second cover 13 form a second housing space S2 that houses a light receiving unit 31, a drive unit 40, and a transmission unit 50, which will be described later.

[0032] The mounting hole seal member 14 is, for example, an O-ring made of silicone rubber. The mounting hole seal member 14 is housed in the unit mounting hole 112h2. The outer diameter of the mounting hole seal member 14 is slightly larger than the inner diameter of the unit mounting hole 112h2.

[0033] The light-emitting unit 20 generates light and emits the generated light into the sample water W in the cell space CS. The light-emitting unit 20 includes a light source 21 and an exit window 22. The light source 21 is, for example, a semiconductor light-emitting element such as a light-emitting diode (LED). The light source 21 is an example of a light-emitting section in the present invention. The light source 21 is housed in the first housing space S1 and held by the first holding part 111. The exit window 22 is made of, for example, sapphire glass and is liquid-tightly attached to the window mounting hole 111h1. The upper surface of the exit window 22 is positioned so as to protrude slightly toward the cell space CS beyond the upper surface of the ceiling wall 111a.

[0034] The light receiving unit 30 receives light transmitted through the sample water W in the cell space CS. The light receiving unit 30 includes a light receiving section 31 and an entrance window 32. The light receiving section 31 is, for example, a semiconductor light receiving element such as a photodiode. The light receiving section 31 is housed in the second housing space S2 and held by the second holder 112. The entrance window 32 is made of, for example, sapphire glass and is attached to the window mounting hole 112h1. The lower surface of the entrance window 32 is positioned so as to protrude slightly toward the cell space CS beyond the lower surface of the bottom wall 112a. The entrance window 32 is positioned parallel to and opposite the exit window 22.

[0035] The drive unit 40 supplies power to move the wiper unit 60. The drive unit 40 is an example of a drive section in the present invention. The drive unit 40 includes a motor 41 and a transmission shaft 42. The motor 41 is housed in the second housing space S2 with its rotation shaft facing downward. The transmission shaft 42 is connected between the motor 41 and the transmission unit 50, and transmits power (reciprocating rotational power in this embodiment) from the motor 41 to the transmission unit 50. The transmission shaft 42 is rod-shaped and extends vertically. A lower end 42a of the transmission shaft 42 is notched in a U-shape.

[0036] FIG. 4 is an enlarged cross-sectional view of the transmission unit 50. As shown in FIG. FIG. 5 is an enlarged exploded cross-sectional view of the transmission unit 50. As shown in FIG.

[0037] The transmission unit 50 transmits power from the drive unit 40 to the wiper unit 60 (a wiper 63 described later; see FIG. 3). The transmission unit 50 includes a housing cylinder 501, a cover ring 502, a cylinder seal member 503, a first shaft seal member 504, a first collar 505, a second shaft seal member 506, a second collar 507, a shaft 508, a third shaft seal member 509, a push collar 510, a collar seal member 511, a first retaining ring 512, a second retaining ring 513, a third retaining ring 514, a fourth retaining ring 515, a bearing 516, a third collar 517, an alignment member 518, and a lubricant 519.

[0038] The accommodating cylindrical portion 501 accommodates first and second shaft seal members 504 and 506, first and second collars 505 and 507, a portion of the shaft 508, a third shaft seal member 509, a push collar 510, a collar seal member 511, first, second, and fourth retaining rings 512, 513, and 515, and a bearing 516. The accommodating cylindrical portion 501 is made of a metal such as stainless steel and has a substantially cylindrical shape. The accommodating cylindrical portion 501 includes a small diameter portion 501a, a medium diameter portion 501b, a large diameter portion 501c, an inner flange portion 501d, an inner groove 501e, an outer groove 501f, and an outer flange portion 501g.

[0039] The inner diameter of casing tube 501 increases stepwise from the bottom to the top, and comprises small diameter section 501a, medium diameter section 501b, and large diameter section 501c. That is, the inner diameter of medium diameter section 501b is larger than the inner diameter of small diameter section 501a and smaller than the inner diameter of large diameter section 501c.

[0040] The lower end of the small diameter portion 501a protrudes inward in a ring shape, forming an inner flange portion 501d. The inner diameter of the inner flange portion 501d is slightly larger than the outer diameter of the shaft portion 508. The medium diameter portion 501b is disposed adjacent to and above the small diameter portion 501a. The large diameter portion 501c is disposed adjacent to and above the medium diameter portion 501b. The inner groove 501e is ring-shaped and is disposed above the large diameter portion 501c.

[0041] The outer groove 501f is ring-shaped and is disposed at the lower part of the outer peripheral surface of the casing cylindrical portion 501. A portion of the outer peripheral surface of the casing cylindrical portion 501 protrudes outward to form an outer flange portion 501g. In other words, the outer groove 501f and the outer flange portion 501g form a portion of the outer peripheral surface of the casing cylindrical portion 501. The outer flange portion 501g is disposed above the outer groove 501f in the up-down direction and at approximately the same position as the upper end of the small diameter portion 501a.

[0042] The cover ring 502 protects the lower surface of the tubular housing portion 501. The cover ring 502 is made of a synthetic resin such as PVC (polyvinyl chloride) and has a ring-like plate shape. The cover ring 502 is attached to the lower surface of the tubular housing portion 501.

[0043] The cylindrical seal member 503 is, for example, an O-ring made of silicone rubber. The inner diameter of the cylindrical seal member 503 is slightly smaller than the outer diameter of the outer groove 501f of the accommodating cylindrical portion 501, and the outer diameter of the cylindrical seal member 503 is slightly larger than the inner diameter of the unit mounting hole 112h2. The cylindrical seal member 503 is attached to the outer groove 501f. The cylindrical seal member 503 is an example of an external seal member according to the present invention.

[0044] The first and second shaft seal members 504, 506 are, for example, Y-packings made of silicone rubber. The inner diameters of the first and second shaft seal members 504, 506 are slightly smaller than the outer diameter of the shaft 508, and the outer diameters of the first and second shaft seal members 504, 506 are slightly larger than the inner diameter of the small diameter portion 501a of the housing cylinder 501. The first and second shaft seal members 504, 506 are housed in the small diameter portion 501a with their lip portions (the crotch portions of the Y shape) facing downward. The first and second shaft seal members 504, 506 are examples of internal seal members defined in the present invention.

[0045] The first and second collars 505, 507 are cylindrical and made of synthetic resin such as PTFE (Poly Tetra Fluoro Ethylene). The inner diameters of the first and second collars 505, 507 are slightly larger than the outer diameter of the shaft portion 508, and the outer diameters of the first and second collars 505, 507 are slightly smaller than the inner diameter of the small diameter portion 501a of the housing cylindrical portion 501. The first and second collars 505, 507 are housed in the small diameter portion 501a.

[0046] At the small diameter portion 501a, the lip portion of the first shaft seal member 504 abuts against the inner flange portion 501d. The first collar 505 abuts against the upper end of the first shaft seal member 504. The lip portion of the second shaft seal member 506 abuts against the upper end of the first collar 505. The lower end of the second collar 507 abuts against the upper end of the second shaft seal member 506.

[0047] The shaft 508 rotates back and forth around the central axis of the shaft 508 based on power from the drive unit 40. The shaft 508 is made of a metal such as stainless steel and has a cylindrical shape. The shaft 508 includes a wiper attachment portion 508a, a first groove 508b, a second groove 508c, a third groove 508d, and a female screw hole 508h.

[0048] Approximately one-quarter of the area from the bottom end of shaft 508 is formed in a flat plate shape having two parallel surfaces, constituting wiper attachment portion 508a. Wiper attachment portion 508a is an example of a first end portion according to the present invention.

[0049] The length of the wiper attachment portion in the present invention is determined based on the size of the cell space, for example, and is not limited to the region of approximately 1 / 4 from the lower end of the shaft portion.

[0050] The first to third grooves 508b to 508d are each ring-shaped and are arranged in the upper half of the shaft portion 508 in the order of first groove 508b, second groove 508c, and third groove 508d from bottom to top, while being spaced apart from one another.

[0051] The female screw hole 508h passes through an upper end portion 508e of the shaft portion 508 along a direction perpendicular to the surface of the wiper attachment portion 508a. The upper end portion 508e is an example of the second end portion according to the present invention.

[0052] The shaft portion 508 is inserted into the casing tube portion 501. In the casing tube portion 501, the shaft portion 508 is inserted through a first shaft seal member 504, a first collar 505, a second shaft seal member 506, a second collar 507, a third shaft seal member 509, a push collar 510, a bearing 516, and a third collar 517. In the vertical direction, the first and second grooves 508b and 508c are disposed within the medium diameter portion 501b. The wiper mounting portion 508a of the shaft portion 508 protrudes downward from the casing tube portion 501 and is disposed below the casing tube portion 501. An upper end portion 508e of the shaft portion 508 protrudes upward from the casing tube portion 501. The third groove 508d and the female threaded hole 508h are disposed above the casing tube portion 501.

[0053] The third shaft seal member 509 is, for example, an O-ring made of silicone rubber. The inner diameter of the third shaft seal member 509 is slightly smaller than the outer diameter of the shaft portion 508, and the outer diameter of the third shaft seal member 509 is smaller than the inner diameter of the small diameter portion 501a. The third shaft seal member 509 is housed in the medium diameter portion 501b and abuts against the upper end of the second collar 507. The third shaft seal member 509 is an example of an internal seal member defined in the present invention.

[0054] The push collar 510 presses the first to third shaft seal members 504, 506, and 509 toward the inner flange portion 501d and assists the reciprocating rotational movement of the shaft portion 508 relative to the tubular housing portion 501. The push collar 510 is made of a metal such as stainless steel and has a substantially cylindrical shape. The push collar 510 is an example of a pressing member defined in the present invention. The push collar 510 includes a small diameter portion 510a, a large diameter portion 510b, a step portion 510c, and an outer groove 510d. The lower half of the inner circumferential surface of the push collar 510 constitutes the small diameter portion 510a, and the upper half constitutes the large diameter portion 510b. The inner diameter of the small diameter portion 510a is smaller than the inner diameter of the large diameter portion 510b and slightly larger than the outer diameter of the shaft portion 508. A step portion 510c is formed between the small diameter portion 510a and the large diameter portion 510b. The outer groove 510d is ring-shaped and is disposed in the lower half of the outer peripheral surface of the push collar 510. In other words, the outer groove 510d constitutes a part of the outer peripheral surface of the push collar 510.

[0055] The push collar 510 is housed in the medium diameter portion 501b of the housing cylinder portion 501. The first and second grooves 508b, 508c of the shaft portion 508 are arranged (housed) in the large diameter portion 510b of the push collar 510.

[0056] A cylindrical (ring-shaped) space (hereinafter referred to as "cylindrical space") RS is formed between large diameter portion 510b of push collar 510 and shaft portion 508. Large diameter portion 510b is an example of the expanded diameter portion of the present invention.

[0057] The collar seal member 511 is, for example, an O-ring made of silicone rubber. The collar seal member 511 is attached to the outer groove 510d of the push collar 510. The collar seal member 511 is in close contact with the outer groove 510d and the inner circumferential surface of the medium diameter portion 501b. The collar seal member 511 is an example of a second internal seal member of the present invention.

[0058] The first to third retaining rings 512 to 514 are, for example, E-type retaining rings made of metal such as stainless steel. The first retaining ring 512 is attached to the first groove 508b of the shaft portion 508, the second retaining ring 513 is attached to the second groove 508c of the shaft portion 508, and the third retaining ring 514 is attached to the third groove 508d of the shaft portion 508. That is, the first and second retaining rings 512 and 513 are housed in the large diameter portion 510b of the push collar 510. The third retaining ring 514 is disposed above the housing cylindrical portion 501. The first to third retaining rings 512 to 514 are examples of the fall-off prevention members defined in the present invention.

[0059] The fourth retaining ring 515 is a C-shaped retaining ring made of metal such as stainless steel. The fourth retaining ring 515 is attached to the inner groove 501e of the tubular housing portion 501. The fourth retaining ring 515 is an example of a second fall-off prevention member according to the present invention.

[0060] The bearing 516 assists the reciprocating rotational motion of the shaft portion 508 relative to the tubular housing portion 501. The outer diameter of the bearing 516 is approximately the same as the inner diameter of the large diameter portion 501c of the tubular housing portion 501, and the inner diameter of the bearing 516 is approximately the same as the outer diameter of the shaft portion 508. The bearing 516 abuts against the upper end of the push collar 510, the fourth retaining ring 515, and the third collar 517.

[0061] The third collar 517 is made of a metal such as stainless steel and has a cylindrical shape. The inner diameter of the third collar 517 is slightly larger than the outer diameter of the shaft portion 508, and the outer diameter of the third collar 517 is smaller than the inner diameter of the fourth retaining ring 515. The third collar 517 is disposed between the bearing 516 and the third retaining ring 514, and abuts against the bearing 516 and the third retaining ring 514.

[0062] The alignment member 518 is, for example, a male screw made of metal such as stainless steel. The alignment member 518 is screwed (attached) into the female threaded hole 508h of the shaft portion 508. Both ends (head and tip) of the alignment member 518 protrude from the shaft portion 508 to the sides of the shaft portion 508 (in the directions in which both surfaces of the wiper attachment portion 508a face).

[0063] The lubricant 519 is, for example, water-resistant grease, and is filled in the large diameter portion 510b (cylindrical space RS) of the push collar 510.

[0064] Return to Figures 3 to 5. The transmission unit 50 is accommodated in the second accommodation space S2 and is detachably and liquid-tightly attached to the unit attachment hole 112h2. The wiper attachment portion 508a of the shaft portion 508 is disposed in the cell space CS. That is, the wiper attachment portion 508a protrudes from the accommodation tube portion 501 toward the cell space CS side of the accommodation tube portion 501. Therefore, a part of the shaft portion 508 (the wiper attachment portion 508a) is in contact with the sample water W when the detector 100 is immersed in the sample water W. The lower end portion of the wiper attachment portion 508a is inserted into the support hole 111h2 of the first holding portion 111. The lower end portion 42a of the transmission shaft 42 is fitted over the upper end portion 508e of the shaft portion 508. Both ends of the alignment member 518 protrude (are disposed) in the inverted U-shaped notch of the lower end portion 42a. As a result, when the transmission shaft 42 rotates in response to the rotation of the motor 41, the shaft portion 508 rotates via the lower end portion 42a and the positioning member 518.

[0065] FIG. 6 is an enlarged cross-sectional view of the detector 100 taken along line BB in FIG. For convenience of explanation, the wiper unit 60 after being moved from the position shown by the solid line is shown by the two-dot chain line in the figure.

[0066] The wiper unit 60 cleans the exit window 22 and the entrance window 32 (see FIG. 3; the same applies below). The wiper unit 60 includes a wiper support member 61, a unit mounting screw 62, a wiper 63, a pair of wiper retainer plates 64, 65, and two wiper mounting screws 66, 67. The wiper support member 61 includes an insertion hole 61h through which the wiper mounting portion 508a of the shaft portion 508 is inserted. The wiper 63 is attached to the wiper support member 61 by the wiper mounting screws 66, 67 while being sandwiched between the wiper retainer plates 64, 65. The wiper support member 61 is attached to the wiper mounting portion 508a of the shaft portion 508 by the unit mounting screw 62. The wiper 63 is, for example, a rubber wiper made of silicone rubber. The wiper 63 is an example of a moving member according to the present invention.

[0067] The wiper unit 60 is disposed in the cell space CS, and is configured to move back and forth (reciprocating rotational motion) in the circumferential direction of the shaft 508 in accordance with the reciprocating rotational motion of the shaft 508. At this time, the wiper 63 is configured to traverse the space between the exit window 22 and the entrance window 32 (part of the cell space CS) while contacting the exit window 22 and the entrance window 32. In other words, the wiper 63 is configured to move back and forth within the sample water W filling the cell space CS. As the wiper 63 moves back and forth, contaminants adhering to the exit window 22 and the entrance window 32 are removed.

[0068] Assembly and disassembly of the transmission unit (1) The transmission unit 50 is configured to be able to be assembled and disassembled. Hereinafter, the assembly and disassembly of the transmission unit 50 will be described with reference to Figures 4 and 5, taking the assembly of the transmission unit 50 as an example.

[0069] First, the cover ring 502 and the cylindrical seal member 503 are attached to the cylindrical accommodating portion 501. Specifically, the cover ring 502 is attached to the lower surface of the cylindrical accommodating portion 501 by, for example, an adhesive. The cylindrical seal member 503 is attached to the outer groove 501f.

[0070] Next, the first shaft seal member 504, the first collar 505, the second shaft seal member 506, and the second collar 507 are sequentially housed in the small diameter portion 501a of the housing cylinder portion 501. At this time, the lip portions (the crotch portions of the Y-shape) of the first and second shaft seal members 504, 506 face downward.

[0071] Next, the first and second retaining rings 512, 513 are attached to the shaft portion 508. Specifically, the first retaining ring 512 is attached to the first groove 508b, and the second retaining ring 513 is attached to the second groove 508c.

[0072] Next, the collar seal member 511 is attached to the outer groove 510d of the push collar 510.

[0073] Next, the third shaft seal member 509 and the push collar 510 are attached to the shaft 508. Specifically, the shaft 508 is inserted into the push collar 510 from above. The third shaft seal member 509 is attached to the portion of the shaft 508 that protrudes downward from the push collar 510. At this time, the first and second retaining rings 512, 513 are housed in the large diameter portion 510b of the push collar 510. At this time, a cylindrical (ring-shaped) cylindrical space RS is formed between the outer peripheral surface of the shaft 508 and the inner peripheral surface of the large diameter portion 510b of the push collar 510.

[0074] Here, the shaft portion 508 is not fixed to the push collar 510. Therefore, when the lower end of the shaft portion 508 is pointed downward, the shaft portion 508 may come off (fall off) from the push collar 510. However, as described above, the first retaining ring 512 is attached to the shaft portion 508. Therefore, the first retaining ring 512 comes into contact with the step portion 510c of the push collar 510, thereby preventing the shaft portion 508 from falling off downward from the push collar 510. As a result, the work efficiency of assembling the transmission unit 50 is improved.

[0075] Next, the shaft portion 508 is inserted into the tubular housing portion 501 from above. At this time, a portion of the shaft portion 508, the third shaft seal member 509, the push collar 510, and the collar seal member 511 are housed in the medium diameter portion 501b. The third shaft seal member 509 is disposed between the second collar 507 and the push collar 510. At this time, the position of the shaft portion 508 relative to the tubular housing portion 501 in the vertical direction is adjusted so that, for example, the length between the lower end of the large diameter portion 510b and the first retaining ring 512 and the length between the upper end of the large diameter portion 510b and the second retaining ring 513 are approximately the same.

[0076] Next, lubricant 519 is filled into cylindrical space RS, and bearing 516, through which the upper part of shaft portion 508 is inserted, is housed in large diameter portion 501c.

[0077] Next, the fourth retaining ring 515 is received in the large diameter portion 501c of the tubular accommodating portion 501 and attached to the inner groove 501e. At this time, the push collar 510 and the bearing 516 are pressed into the tubular accommodating portion 501 from above by the fourth retaining ring 515. Therefore, the first shaft seal member 504, the first collar 505, the second shaft seal member 506, the second collar 507, the third shaft seal member 509, the push collar 510, and the bearing 516 are pressed into the tubular accommodating portion 501 from above by the fourth retaining ring 515. As a result, upward movement of the first shaft seal member 504, the first collar 505, the second shaft seal member 506, the second collar 507, the third shaft seal member 509, the push collar 510, and the bearing 516 is restricted. That is, the fourth retaining ring 515 prevents these components (the first to third shaft seal members 504, 506, 509, the first and second collars 505, 507, the push collar 510, and the bearing 516) from falling off upward from the accommodating cylindrical portion 501. Furthermore, the first to third shaft seal members 504, 506, 509 are pressed toward the inner flange portion 501d by the push collar 510. The lip portions of the first and second shaft seal members 504, 506 are pushed open and come into tight contact with the outer circumferential surface of the shaft portion 508 and the inner circumferential surface of the small diameter portion 501a. Furthermore, the third shaft seal member 509 comes into tight contact with the second collar 507, the shaft portion 508, and the push collar 510. That is, the sealing performance of the first to third shaft seal members 504, 506, 509 is improved.

[0078] Furthermore, even if a downward stress is applied to the shaft portion 508 with the fourth retaining ring 515 attached to the inner groove 501e, the first retaining ring 512 comes into contact with the step portion 510c, thereby restricting the downward movement of the shaft portion 508. In other words, the first retaining ring 512 prevents the shaft portion 508 from falling off the casing cylindrical portion 501 downward. On the other hand, even if an upward stress is applied to the shaft portion 508, the second retaining ring 513 comes into contact with the bearing 516, thereby restricting the upward movement of the shaft portion 508. In other words, the second retaining ring 513 prevents the shaft portion 508 from falling off the casing cylindrical portion 501 upward.

[0079] Next, the third collar 517 and the third retaining ring 514 are attached to the shaft portion 508. Specifically, the upper part of the shaft portion 508 is inserted into the third collar 517 so that the third collar 517 abuts against the upper end of the bearing 516. The third retaining ring 514 is attached to the third groove 508d of the shaft portion 508 while abutting against the upper end of the third collar 517. As a result, the position of the shaft portion 508 is aligned with respect to the accommodating cylindrical portion 501 in the up-down direction. That is, approximately the lower half of the shaft portion 508 is positioned below the accommodating cylindrical portion 501, and the upper end portion 508e of the shaft portion 508, including the third groove 508d, is positioned above the accommodating cylindrical portion 501. Furthermore, within the large diameter portion 510b of the push collar 510, the first retaining ring 512 is positioned away from the step portion 510c, and the second retaining ring 513 is positioned away from the bearing 516. That is, the length between the lower end of the large diameter portion 510b and the first retaining ring 512 and the length between the upper end of the large diameter portion 510b and the second retaining ring 513 are approximately the same.

[0080] Next, the positioning member 518 is attached to the female thread hole 508h of the shaft portion 508. In this way, the respective components (from the tubular housing portion 501 to the lubricant 519) are assembled into one transmission unit 50. On the other hand, the transmission unit 50 (except for the covering 502) can be easily disassembled by reversing the assembly procedure described above. Therefore, the respective seal members (the tubular seal member 503, the first to third shaft seal members 504, 506, 509, and the collar seal member 511) can be separately and individually replaced, for example, after replacing the transmission unit 50 described below.

[0081] In the transmission unit 50, a portion of the shaft portion 508 is accommodated in the accommodating cylindrical portion 501 so as to be capable of reciprocating rotation in the circumferential direction of the shaft portion 508. That is, the shaft portion 508 is supported in the accommodating cylindrical portion 501 so as to be capable of reciprocating rotation in the circumferential direction of the shaft portion 508. Furthermore, in the small diameter portion 501a, the first and second shaft seal members 504, 506 are in close contact with the outer peripheral surface of the shaft portion 508 and the inner peripheral surface of the small diameter portion 501a. Furthermore, in the medium diameter portion 501b, the third shaft seal member 509 is in close contact with the outer peripheral surface of the shaft portion 508, the collar seal member 511 is in close contact with the outer groove 510d and the inner peripheral surface of the medium diameter portion 501b, and the lubricant 519 is filled in the cylindrical space RS. In other words, the lubricant 519 is in close contact with the outer peripheral surface of the shaft 508 and the inner peripheral surface of the large-diameter portion 510b of the push collar 510. As a result, the sample water W flowing along the outer peripheral surface of the shaft 508 is blocked by the first to third shaft seal members 504, 506, 509 and the lubricant 519, and does not infiltrate into the upper part (second storage space S2) of the tubular accommodating portion 501. On the other hand, the sample water W flowing along the inner peripheral surface of the tubular accommodating portion 501 is blocked by the first and second shaft seal members 504, 506 and the collar seal member 511, and does not infiltrate into the upper part (second storage space S2) of the tubular accommodating portion 501.

[0082] Furthermore, in the transmission unit 50, even if downward stress is applied to the shaft portion 508, the third retaining ring 514 comes into contact with the third collar 517, thereby restricting the downward movement of the shaft portion 508. In other words, the shaft portion 508 does not fall off downward from the tubular housing portion 501. On the other hand, even if upward stress is applied to the shaft portion 508, the second retaining ring 513 comes into contact with the bearing 516, thereby restricting the upward movement of the shaft portion 508. In other words, the shaft portion 508 does not fall off upward from the tubular housing portion 501.

[0083] In this way, in transmission unit 50, shaft 508, which functions as a rotation shaft for the reciprocating rotational motion of wiper 63, and first to third shaft seal members 504, 506, and 509, which support shaft 508 liquid-tightly so that it can rotate back and forth, are assembled as a single unit. As described above, wiper mounting portion 508a of shaft 508 comes into contact with liquid when device 1 is in use. That is, in device 1, shaft 508, which functions as a movable member that comes into contact with liquid, and first to third shaft seal members 504, 506, and 509 (and lubricant 519) which function as seal members for the movable members are unitized as one transmission unit 50.

[0084] ●Attaching and detaching the transmission unit (1) Next, the attachment and detachment of the transmission unit 50 in the detector 100 will be described using an example in which the transmission unit 50 is replaced. In the following description, reference will also be made to FIG.

[0085] Figure 7 is a cross-sectional view showing an example of removing the transmission unit 50 in chronological order, where (a) shows the state where the second cover 13 is removed, (b) shows the state where the drive unit 40 is removed, and (c) shows the state where the transmission unit 50 and the wiper unit 60 are removed.

[0086] First, the second cover 13 is removed from the second holding portion 112. Next, the drive unit 40 is removed from the unit holding portion 11 (second holding portion 112). At this time, the lower end portion 42a of the transmission shaft 42 is removed from both ends of the alignment member 518.

[0087] It should be noted that only the transmission shaft may be removed from the motor, rather than the drive unit in the present invention, or the drive unit may be moved upward.

[0088] Next, the wiper unit 60 is removed from the wiper mounting portion 508a of the shaft portion 508. Next, the transmission unit 50 is removed from the unit mounting hole 112h2.

[0089] Next, a new transmission unit 50 is attached to the unit mounting hole 112h2. At this time, in the cell space CS, the lower end of the shaft portion 508 is inserted into the insertion hole 61h of the wiper support member 61 and inserted into the support hole 111h2 of the first holder 111. Of the shaft portion 508, the wiper mounting portion 508a is disposed in the cell space CS. That is, the wiper mounting portion 508a protrudes from the accommodating cylindrical portion 501 toward the cell space CS. The cover ring 502 abuts against the mounting hole seal member 14 housed in the unit mounting hole 112h2 and presses the mounting hole seal member 14 downward. At this time, the mounting hole seal member 14 closes the gap between the unit mounting hole 112h2 and the transmission unit 50 from below. In addition, the cylindrical portion seal member 503 is in close contact with the inner circumferential surface of the unit mounting hole 112h2 and the outer groove 501f. As a result, when the detector 100 is immersed in the sample water W, the sample water W flowing along the inner surface of the unit mounting hole 112h2 and the sample water W flowing along the outer surface of the storage cylindrical portion 501 are blocked by the mounting hole sealing member 14 and the cylindrical portion sealing member 503 and do not enter the second storage space S2.

[0090] Next, the drive unit 40 is attached to the unit holder 11 (second holder 112) and the transmission unit 50. At this time, the upper end 508e of the shaft 508 protrudes from the housing tube 501 toward the drive unit 40. The lower end 42a of the transmission shaft 42 is fitted over the upper end 508e. At this time, both ends of the alignment member 518 are disposed in the inverted U-shaped notch of the lower end 42a. As a result, the shaft 508 is aligned with the drive unit 40 in the circumferential direction of the shaft 508. That is, the positions of both surfaces of the wiper attachment portion 508a with respect to the drive unit 40 are aligned with respect to the circumferential direction of the shaft 508. That is, the wiper 63 is aligned with respect to the drive unit 40 in the circumferential direction of the shaft 508.

[0091] Next, the wiper support member 61 to which the wiper 63 is attached is attached to the wiper attachment portion 508 a of the shaft portion 508 with the unit attachment screw 62 .

[0092] Next, the second cover 13 is attached to the second holding portion 112 .

[0093] In this manner, in the present device 1, simply by replacing the transmission unit 50 of the detector 100, the movable member (shaft 508) that comes into contact with the sample water W and its seal members (first to third shaft seal members 504, 506, 509) can be replaced together. In other words, the transmission unit 50 functions as a replacement cartridge for the movable member of the detector 100 that comes into contact with the sample water W and its seal members.

[0094] Summary (1) According to the embodiment described above, the device 1 includes a detector 100 that is immersed in a water sample W and detects the quality of the water sample W. The detector 100 includes a transmission unit 50 that transmits power from the drive unit 40 to the wiper unit 60. The transmission unit 50 includes a shaft 508, a tubular housing 501, first to third shaft seal members 504, 506, and 509 (internal seal members), and a tubular seal member 503 (external seal member). The shaft 508 rotates back and forth about the central axis of the shaft 508 based on the power from the drive unit 40. The tubular housing 501 houses a portion of the shaft 508 so that the shaft 508 can rotate back and forth. The first to third shaft seal members 504, 506, and 509 are housed in the tubular housing 501 and provide a liquid-tight seal between the shaft 508 and the tubular housing 501. The cylindrical seal member 503 provides a liquid-tight seal between the outer peripheral surface (outer groove 501f) of the tubular housing portion 501 and the inner peripheral surface of the unit mounting hole 112h2. The transmission unit 50 is detachably attached to the unit mounting hole 112h2. This configuration enables replacement of the movable member (shaft 508) that comes into contact with liquid and its seal members (first to third shaft seal members 504, 506, 509, and cylindrical seal member 503) simply by replacing the transmission unit 50. Furthermore, the transmission unit 50 is assembled before replacement. Therefore, a person replacing the transmission unit 50 (e.g., a user or maintenance inspector of the device 1) can replace the movable member and its seal members together without assembling the transmission unit 50. As a result, the time required to replace the seal member of the movable member is shortened, and problems such as incorrect orientation of the seal member do not occur. Therefore, in the present device 1 equipped with the immersion type detector 100, the work of replacing the seal member of the movable member that comes into contact with the liquid becomes easy.

[0095] Furthermore, according to the embodiment described above, the shaft portion 508 includes a wiper attachment portion 508a and an upper end portion 508e. The wiper attachment portion 508a protrudes toward the cell space CS side (lower side) of the tubular housing portion 501, and the wiper unit 60 (wiper 63) is detachably attached to the wiper attachment portion 508a. The upper end portion 508e protrudes toward the drive unit 40 side (upper side) of the tubular housing portion 501. The transmission unit 50 includes an alignment member 518 that aligns the position of the wiper unit 60 (wiper 63) relative to the drive unit 40. The upper end portion 508e is detachably attached to the transmission shaft 42 of the drive unit 40. The alignment member 518 is attached to the upper end portion 508e. With this configuration, the positioning operation of the detached wiper 63 is not required when replacing the seal member of the movable member. As a result, in the present device 1 equipped with the immersion type detector 100, the work of replacing the seal member of the movable member that comes into contact with the liquid becomes easy.

[0096] Furthermore, according to the embodiment described above, the transmission unit 50 is configured to be disassembled and reassembled. The transmission unit 50 is provided with anti-detachment members (second and third retaining rings 513, 514) that prevent the shaft portion 508 from falling off (disengaging) from the casing tubular portion 501 when the transmission unit 50 is attached or detached. With this configuration, even if a person grips the casing tubular portion 501 or the shaft portion 508 when replacing the transmission unit 50, the shaft portion 508 will not fall off from the casing tubular portion 501. In other words, the transmission unit 50 is easy to handle when replacing it. As a result, in the present device 1 equipped with the immersion-type detector 100, the work of replacing the sealing members of the movable members that come into contact with liquid is facilitated.

[0097] Furthermore, according to the embodiment described above, the shaft portion 508 is configured to rotate back and forth about the central axis of the shaft portion 508 relative to the tubular housing portion 501. The transmission unit 50 includes a push collar 510, a bearing 516, a fourth retaining ring 515, and a collar seal member 511. The push collar 510 is housed in the tubular housing portion 501 and presses against the first to third shaft seal members 504, 506, and 509. The shaft portion 508 is inserted through the push collar 510 and the bearing 516. The fourth retaining ring 515 is housed in the tubular housing portion 501 and prevents the push collar 510 and the bearing 516 from falling off from the tubular housing portion 501. The collar seal member 511 provides a liquid-tight seal between the tubular housing portion 501 and the push collar 510. The push collar 510 is disposed between the first to third shaft seal members 504, 506, and 509 and the fourth retaining ring 515. According to this configuration, the push collar 510 presses the first to third shaft seal members 504, 506, and 509 against the inner flange portion 501d, thereby improving the sealing performance of the first to third shaft seal members 504, 506, and 509. Furthermore, the shaft portion 508 is supported by the push collar 510 and the bearing 516, which facilitates reciprocating rotation. Furthermore, the push collar 510 and the bearing 516 are prevented from falling off the tubular accommodating portion 501 by the fourth retaining ring 515. Furthermore, the tubular seal member 503 blocks the sample water W flowing along the inner circumferential surface of the tubular accommodating portion 501. Therefore, even if the transmission unit 50 is configured to include the push collar 510 and the bearing 516, the transmission unit 50 is easy to handle and is prevented from infiltrating the sample water W. As a result, in the present device 1 including the immersion-type detector 100, the work of replacing the sealing members of the movable members that come into contact with the liquid becomes easy.

[0098] Furthermore, according to the embodiment described above, the push collar 510 includes a large-diameter portion 510b that forms a cylindrical space RS between the push collar 510 and the shaft portion 508. The transmission unit 50 includes a lubricant 519 that fills the cylindrical space RS. With this configuration, the sample water W traveling between the inner circumferential surface of the push collar 510 and the outer circumferential surface of the shaft portion 508 in the cylindrical space RS is blocked by the lubricant 519. A portion of the lubricant 519 is supplied to the gap between the push collar 510 and the shaft portion 508 and to the bearing 516. As a result, the shaft portion 508 is easily rotated back and forth. Furthermore, filling and removing the lubricant 519 is not required when replacing the seal member. Therefore, in the present device 1 including the immersion-type detector 100, the work of replacing the seal member of the movable member that comes into contact with the liquid is simplified.

[0099] Furthermore, according to the embodiment described above, the detector 100 is provided with a wiper 63 that moves within the sample water W that fills the cell space CS between the exit window 22 and the entrance window 32. With this configuration, contaminants adhering to each of the exit window 22 and the entrance window 32 are removed as the wiper 63 moves back and forth.

[0100] ●Measuring device (2)● Next, another embodiment of the measuring device according to the present invention (hereinafter referred to as the "second embodiment") will be described, focusing on the differences from the previously described embodiment (hereinafter referred to as the "first embodiment"). In the second embodiment, the direction of wiper movement is different from that of the first embodiment. In the following description, elements that are common to the first embodiment and elements that differ only in posture (position and orientation) or size from the first embodiment will be assigned the same reference numerals, and some or all of their descriptions will be omitted.

[0101] ●Configuration of measuring device (2) FIG. 8 is a schematic diagram showing a second embodiment of the present device.

[0102] The apparatus 1A includes a detector 100A and a converter 200.

[0103] The detector 100A detects the absorbance of the water sample W by emitting light to the water sample W and receiving the light that has passed through the water sample W. The detector 100A is installed below the surface of the water sample W (immersed in the water sample W). The configuration of the detector 100A will be described later. The detector 100A is electrically connected to the converter 200 via a cable C.

[0104] ●Detector (2) configuration FIG. 9 is a side view of the detector 100A. FIG. 10 is a cross-sectional view of the detector 100A taken along line CC in FIG. FIG. 11 is an enlarged cross-sectional view of the detector 100A taken along line CC in FIG. 10 and 11, for the sake of convenience, some cross sections are omitted from the illustration.

[0105] The detector 100A includes a housing 10A, a light emitting unit 20A, a light receiving unit 30A, a drive unit 40A, a transmission unit 50A, a wiper unit 60A, and temporary fixing screws 70 (see FIG. 13).

[0106] Housing 10A houses light-emitting unit 20A, light-receiving unit 30A, drive unit 40A, and transmission unit 50A. Housing 10A is shaped like a hammer, with the bottom end of the cylindrical body protruding in two directions. Housing 10A includes unit holder 11A, cylindrical first cover 12A and second cover 13A with bottoms, and cylindrical third cover 14A.

[0107] The unit holder 11A holds the light emitting unit 20A, the light receiving unit 30A, and the transmission unit 50A. The unit holder 11A includes a first holder 111A, a second holder 112A, a third holder 113A, and a frame body 114A.

[0108] The first holding portion 111A holds the light-emitting unit 20A. The first holding portion 111A has a flat, bottomed cylindrical shape. The first holding portion 111A has a window mounting hole 111Ah. The window mounting hole 111Ah is disposed in the bottom wall 111Aa and penetrates the bottom wall 111Aa. The window mounting hole 111Ah is disposed so as to face a cell space CSA, which will be described later.

[0109] The second holding portion 112A holds the light receiving unit 30A. The second holding portion 112A has a flat, bottomed cylindrical shape. The second holding portion 112A has a window mounting hole 112Ah. The window mounting hole 112Ah is disposed in the bottom wall 112Aa and penetrates the bottom wall 112Aa. The window mounting hole 112Ah is disposed so as to face a cell space CSA, which will be described later.

[0110] The third holding portion 113A holds the drive unit 40A and the transmission unit 50A. The third holding portion 113A is cylindrical with a bottom. The third holding portion 113A has a unit mounting hole 113Ah. The unit mounting hole 113Ah is arranged in the bottom wall 113Aa and penetrates the bottom wall 113Aa. The unit mounting hole 113Ah is arranged to face the cell space CSA, which will be described later.

[0111] The first holding portion 111A and the second holding portion 112A each extend downward from the lower portion of the third holding portion 113A. The bottom wall 111Aa of the first holding portion 111A and the bottom wall 112Aa of the second holding portion 112A are arranged to face each other along the vertical direction. A cell space CSA is formed between the bottom walls 111Aa and 112Aa and is filled with sample water W (see FIG. 8; the same applies below).

[0112] The two window mounting holes 111Ah and 112Ah are arranged on the same imaginary axis along the horizontal direction, that is, the two window mounting holes 111Ah and 112Ah are arranged to face each other with the cell space CSA in between.

[0113] The frame body 114A holds the drive unit 40A and fixes the transmission unit 50A to the third holding portion 113A. The frame body 114A is a frame body made up of frameworks of a plurality of shapes.

[0114] The first cover 12A is attached to the first holding part 111A in a liquid-tight and detachable manner, so that the first holding part 111A and the first cover 12A form a first housing space SA1 in which a light source 21 (described later) is housed.

[0115] The second cover 13A is attached to the second holding part 112A in a liquid-tight and detachable manner, so that the second holding part 112A and the second cover 13A form a second housing space SA2 in which the light receiving part 31 (described later) is housed.

[0116] The third cover 14A is attached to the third holding portion 113A in a liquid-tight and detachable manner, so that the third holding portion 113A and the third cover 14A form a third housing space SA3 in which the drive unit 40A and the transmission unit 50A are housed.

[0117] The light-emitting unit 20A includes a light source 21, an exit window 22, and a window mounting member 23A. The window mounting member 23A is cylindrical and is mounted in the window mounting hole 111Ah so as to protrude into the cell space CSA. The exit window 22 is mounted liquid-tightly to the end of the window mounting member 23A on the cell space CSA side.

[0118] The light-receiving unit 30A includes a light-receiving section 31, an entrance window 32, and a window mounting member 33A. The window mounting member 33A is cylindrical and is mounted in the window mounting hole 112Ah so as to protrude into the cell space CSA. The entrance window 32 is mounted liquid-tightly to the end of the window mounting member 33A on the cell space CSA side. The entrance window 32 is disposed parallel to and opposite the exit window 22.

[0119] The drive unit 40A includes a motor 41, a transmission shaft 42A, a cylindrical cam member 43A, and a connecting portion 44A. The drive unit 40A is an example of a drive portion of the present invention. The transmission shaft 42A is connected between the cylindrical cam member 43A and the transmission unit 50A and transmits power (reciprocating vertical power in this embodiment) from the cylindrical cam member 43A to the transmission unit 50A. The transmission shaft 42A is rod-shaped and extends vertically. The cylindrical cam member 43A converts the reciprocating rotational power from the motor 41 into reciprocating vertical power. The connecting portion 44A is a union nut having a female thread surface 44Aa and an inner flange portion 44Ab. The upper end of the inner circumferential surface of the connecting portion 44A protrudes in a ring shape and forms the inner flange portion 44Ab. The connecting portion 44A is rotatably attached to the lower end portion 42Aa of the transmission shaft 42A.

[0120] FIG. 12 is an enlarged cross-sectional view of the transmission unit 50A. FIG. 13 is an enlarged exploded cross-sectional view of the transmission unit 50A.

[0121] Transmission unit 50A transmits power from drive unit 40A to wiper unit 60A (wiper 63A described later). Transmission unit 50A includes a casing cylinder 501A, a cylinder seal member 503, a first shaft seal member 504, a second shaft seal member 506, a shaft 508A, a third shaft seal member 509, an alignment member 518A, a bellows member 520A, a first mounting member 521A, a second mounting member 522A, and a washer 523A.

[0122] The accommodating cylindrical portion 501A accommodates the first to third shaft seal members 504, 506, and 509, a portion of the shaft portion 508A, the bellows member 520A, the first mounting member 521A, and the second mounting member 522A. The accommodating cylindrical portion 501A is made of a metal such as stainless steel and has a substantially cylindrical shape. The accommodating cylindrical portion 501A includes a small diameter portion 501Aa, a medium diameter portion 501Ab, a large diameter portion 501Ac, a female thread surface 501Ad, an outer groove 501Af, an outer flange portion 501Ag, and an insertion hole 501Ah.

[0123] The lower region of the inner circumferential surface of the casing tube 501A constitutes a large diameter portion 501Ac, the upper end portion constitutes a medium diameter portion 501Ab, and the region between the large diameter portion 501Ac and the medium diameter portion 501Ab constitutes a small diameter portion 501Aa. The inner diameter of the medium diameter portion 501Ab is larger than the inner diameter of the small diameter portion 501Aa but smaller than the inner diameter of the large diameter portion 501Ac.

[0124] The inner peripheral surface of the lower portion of the large diameter portion 501Ac forms a female thread surface 501Ad.

[0125] The outer groove 501Af is ring-shaped and is disposed at the lower part of the outer peripheral surface of the casing cylindrical portion 501A. A portion of the outer peripheral surface of the casing cylindrical portion 501A protrudes outward to form an outer flange portion 501Ag. In other words, the outer groove 501Af and the outer flange portion 501Ag form a portion of the outer peripheral surface of the casing cylindrical portion 501A. The outer flange portion 501Ag is disposed above the outer groove 501Af in the up-down direction and at approximately the same position as the upper end of the large diameter portion 501Ac.

[0126] The insertion hole 501Ah passes through the medium diameter portion 501Ab.

[0127] The cylindrical seal member 503 is attached to the outer groove 501Af. The inner diameter of the cylindrical seal member 503 is slightly smaller than the outer diameter of the outer groove 501Af of the accommodating cylindrical portion 501A, and the outer diameter of the cylindrical seal member 503 is slightly larger than the inner diameter of the unit mounting hole 113Ah. The cylindrical seal member 503 is an example of an external seal member according to the present invention.

[0128] The first shaft seal member 504 is attached to a first groove 508Ad (described later) with its lip facing downward. The second shaft seal member 506 is attached to a second groove 508Ae (described later) with its lip facing downward. The inner diameters of the first and second shaft seal members 504, 506 are slightly smaller than the outer diameters of the corresponding first and second grooves 508Ad, 508Ae, and the outer diameters of the first and second shaft seal members 504, 506 are slightly larger than the inner diameter of the small diameter portion 501Aa of the casing cylindrical portion 501A. The first and second shaft seal members 504, 506 are examples of internal seal members defined in the present invention.

[0129] The shaft portion 508A reciprocates (reciprocating up and down) in the axial direction (vertical direction) of the shaft portion 508A based on power from the drive unit 40A. The shaft portion 508A is made of a metal such as stainless steel and has a cylindrical shape. The shaft portion 508A includes a small diameter portion 508Aa, a medium diameter portion 508Ab, a large diameter portion 508Ac, a first groove 508Ad, a second groove 508Ae, a third groove 508Af, an outer flange portion 508Ag, a female threaded hole 508Ah1, a mounting hole 508Ah2, a first male threaded surface 508Ai, and a second male threaded surface 508Aj.

[0130] The outer diameter of shaft portion 508A increases stepwise from bottom to top, constituting small diameter portion 508Aa, medium diameter portion 508Ab, and large diameter portion 508Ac. That is, the outer diameter of medium diameter portion 508Ab is larger than the outer diameter of small diameter portion 508Aa and smaller than the outer diameter of large diameter portion 508Ac. The outer diameter of medium diameter portion 508Ab is smaller than the inner diameter of bellows portion 520Ac, which will be described later. The outer diameter of large diameter portion 508Ac is slightly smaller than the inner diameter of small diameter portion 501Aa of casing tubular portion 501A. Small diameter portion 508Aa is an example of a first end portion according to the present invention.

[0131] Each of the first to third grooves 508Ad to 508Af is ring-shaped. The first to third grooves 508Ad to 508Af are arranged in the lower half of the medium diameter portion 508Ab, spaced apart from one another, in the order of first groove 508Ad, second groove 508Ae, and third groove 508Af, from bottom to top. Each of the first to third grooves 508Ad to 508Af constitutes a part of the outer circumferential surface of the shaft portion 508A.

[0132] The upper part of the outer peripheral surface of the large diameter portion 508Ac protrudes outward in a ring shape to form an outer flange portion 508Ag. The outer diameter of the outer flange portion 508Ag is slightly smaller than the inner diameter of the medium diameter portion 501Ab of the casing cylindrical portion 501A and larger than the inner diameter of the small diameter portion 501Aa of the casing cylindrical portion 501A.

[0133] The female screw hole 508Ah1 is arranged in the outer flange portion 508Ag along the radial direction of the shaft portion 508A. The female screw hole 508Ah1 corresponds to the temporary fixing screw 70, which will be described later.

[0134] The mounting hole 508Ah2 is arranged in the up-down direction on the upper end surface of the shaft portion 508A (large diameter portion 508Ac). That is, the mounting hole 508Ah2 is arranged at the upper end portion 508Ak of ​​the shaft portion 508A. The upper end portion 508Ak is an example of a second end portion according to the present invention.

[0135] The first male thread surface 508Ai is disposed on the upper half of the outer circumferential surface of the small diameter portion 508Aa. The first male thread surface 508Ai corresponds to the female thread surface 521Aa of the first mounting member 521A, which will be described later.

[0136] The second male thread surface 508Aj is disposed at an upper end 508Ak of ​​the outer peripheral surface of the large diameter portion 508Ac. In the vertical direction, the second male thread surface 508Aj is disposed above the outer flange portion 508Ag. The second male thread surface 508Aj corresponds to the female thread surface 44Aa of the connecting portion 44A.

[0137] Shaft 508A is inserted through tubular housing 501A. In tubular housing 501A, shaft 508A is inserted through first to third shaft seal members 504, 506, 509, bellows member 520A, first mounting member 521A, and second mounting member 522A. In the up-down direction, first to third grooves 508Ad-508Af are arranged within small diameter portion 501Aa.

[0138] The third shaft seal member 509 is attached to the third groove 508Af. The inner diameter of the third shaft seal member 509 is slightly smaller than the outer diameter of the third groove 508Af, and the outer diameter of the third shaft seal member 509 is slightly larger than the inner diameter of the small diameter portion 501Aa of the casing cylindrical portion 501A. The third shaft seal member 509 is an example of an internal seal member defined in the present invention.

[0139] The alignment member 518A is cylindrical and made of metal such as stainless steel. The lower half of the alignment member 518A is attached to the mounting hole 508Ah2 of the shaft portion 508A (i.e., the upper end portion 508Ak of ​​the shaft portion 508A). The upper half of the alignment member 518A protrudes upward from the upper end surface of the shaft portion 508A.

[0140] Bellows member 520A expands and contracts based on the reciprocating up and down movement of shaft portion 508A. Bellows member 520A is made of, for example, silicone rubber, and has a roughly cylindrical shape with projections and recesses. Bellows member 520A is housed in large diameter portion 501Ac of housing cylindrical portion 501A. Bellows member 520A includes outer flange portion 520Aa, inner flange portion 520Ab, and bellows portion 520Ac.

[0141] The upper end of the outer peripheral surface of bellows member 520A protrudes outward in a ring shape to form outer flange portion 520Aa. The outer diameter of outer flange portion 520Aa is slightly larger than the inner diameter of large diameter portion 501Ac of tubular housing portion 501A. Outer flange portion 520Aa is attached to the upper end of large diameter portion 501Ac by second attachment member 522A. Outer flange portion 520Aa is an example of the other end portion of the present invention.

[0142] The lower end of the inner peripheral surface of bellows member 520A protrudes inward in a ring shape to form inner flange portion 520Ab. The inner diameter of inner flange portion 520Ab is slightly smaller than the outer diameter of small diameter portion 508Aa of shaft portion 508A and smaller than the outer diameter of medium diameter portion 508Ab. Inner flange portion 520Ab is attached to the upper end of small diameter portion 508Aa of shaft portion 508A by first attachment member 521A. Inner flange portion 520Ab is an example of one end portion according to the present invention.

[0143] The bellows portion 520Ac is a cylindrical bellows portion that is disposed between the outer flange portion 520Aa and the inner flange portion 520Ab and is connected to the outer flange portion 520Aa and the inner flange portion 520Ab. The inner diameter of the bellows portion 520Ac is larger than the outer diameter of the medium diameter portion 508Ab of the shaft portion 508.

[0144] The first mounting member 521A mounts the lower end (inner flange portion 520Ab) of the bellows member 520A to the shaft portion 508A. The first mounting member 521A is, for example, a nut having an internally threaded surface 521Aa and an inner flange portion 521Ab. The internally threaded surface 521Aa is disposed on the inner circumferential surface of the inner flange portion 521Ab. The lower half of the inner circumferential surface of the first mounting member 521A protrudes inward in a ring shape and forms the inner flange portion 521Ab. The first mounting member 521A is mounted to the small diameter portion 508Aa of the shaft portion 508A.

[0145] The second mounting member 522A mounts the upper end (outer flange portion 520Aa) of the bellows member 520A to the tubular accommodating portion 501A. The second mounting member 522A is cylindrical and includes an externally threaded surface 522Aa and an inner flange portion 522Ab. The externally threaded surface 522Aa is located in the lower half of the outer circumferential surface of the second mounting member 522A. The upper end of the inner circumferential surface of the second mounting member 522A protrudes inward in a ring shape and forms the inner flange portion 522Ab. The second mounting member 522A is mounted to the large diameter portion 501Ac of the tubular accommodating portion 501A.

[0146] Washer 523A is housed in first mounting member 521A and presses the lower end portion (inner flange portion 520Ab) of bellows member 520A upward.

[0147] Return to Figures 11 to 13. The transmission unit 50A is accommodated in the third accommodation space SA3 and is detachably and liquid-tightly attached to the unit attachment hole 113Ah. The small diameter portion 508Aa of the shaft 508A is disposed in the cell space CSA. That is, the small diameter portion 508Aa protrudes from the accommodation tube 501A toward the cell space CSA of the accommodation tube 501A. Therefore, a portion of the shaft 508A (the small diameter portion 508Aa) is in contact with the sample water W when the detector 100A is immersed in the sample water W. The outer peripheral surface of the bellows member 520A is also in contact with the sample water W. The coupling portion 44A of the drive unit 40A is attached to an upper end 508Ak of ​​the shaft 508A. As a result, when the transmission shaft 42A reciprocates up and down in response to the rotation of the motor 41, the shaft 508A reciprocates up and down.

[0148] FIG. 14 is an enlarged cross-sectional view of the detector 100A taken along line DD in FIG. For convenience of explanation, the wiper unit 60A after being moved from the position shown by the solid line is shown by the two-dot chain line in the figure.

[0149] The wiper unit 60A cleans the exit window 22 and the entrance window 32 (see FIG. 10; the same applies below). The wiper unit 60A includes a wiper support member 61A, a unit mounting screw 62A, a wiper 63A, a pair of wiper retainer plates 64A and 65A, and two wiper mounting screws 66A and 67A. The wiper support member 61A includes an insertion hole 61Ah into which the lower end of the shaft portion 508A (the lower end of the small diameter portion 508Aa) is inserted. The wiper 63A is attached to the wiper support member 61A by the wiper mounting screws 66A and 67A while being sandwiched between the wiper retainer plates 64A and 65A. The wiper support member 61A is attached to the lower end of the small diameter portion 508Aa of the shaft portion 508A by the unit mounting screw 62A. The wiper 63A is an example of a moving member defined in the present invention.

[0150] The wiper unit 60A is disposed in the cell space CSA, and is configured to move back and forth in the axial direction of the shaft 508A (reciprocating up and down movement) in accordance with the reciprocating up and down movement of the shaft 508A. At this time, the wiper 63A is configured to traverse the space between the exit window 22 and the entrance window 32 (part of the cell space CSA) while contacting the exit window 22 and the entrance window 32. In other words, the wiper 63A is configured to move back and forth within the sample water W filling the cell space CSA. As the wiper 63A moves back and forth, contaminants adhering to the exit window 22 and the entrance window 32 are removed.

[0151] The temporary fixing screw 70 is a screw that temporarily fixes the shaft portion 508A to the accommodating cylinder portion 501A when the transmission unit 50A is attached, detached, or transported. In other words, the temporary fixing screw 70 is a part that is not attached to the transmission unit 50A while the device 1A is operating.

[0152] ● Assembly and disassembly of transmission unit (2) The transmission unit 50A is configured to be able to be assembled and disassembled. Hereinafter, the assembly and disassembly of the transmission unit 50A will be described with reference to Figures 12 and 13, taking the assembly of the transmission unit 50A as an example.

[0153] First, the cylindrical seal member 503 is attached to the outer groove 501Af of the accommodating cylindrical portion 501.

[0154] Next, the first to third shaft seal members 504, 506, 509 and the alignment member 518A are attached to the shaft 508A. Specifically, the first shaft seal member 504 is attached to the first groove 508Ad with its lip facing downward. The second shaft seal member 506 is attached to the second groove 508Ae with its lip facing downward. The third shaft seal member 509 is attached to the third groove 508Af. The alignment member 518A is fitted into the attachment hole 508Ah2 of the shaft 508A. At this time, the upper half of the alignment member 518A protrudes above the shaft 508A.

[0155] The orientation of the lip portions of the first and second shaft seal members in the present invention is not limited to this embodiment. That is, for example, the lip portions of the first and second shaft seal members in the present invention may be oriented upward. Also, for example, one of the lip portions may be oriented upward and the other lip portion may be oriented downward.

[0156] Next, bellows member 520A is attached to tubular accommodating portion 501A by second attachment member 522A. Specifically, bellows member 520A is housed in large diameter portion 501Ac of tubular accommodating portion 501A. Next, second attachment member 522A is inserted into large diameter portion 501Ac. At this time, male thread surface 522Aa is screwed into female thread surface 501Ad, thereby attaching second attachment member 522A to tubular accommodating portion 501A, and an upper end portion (outer flange portion 520Aa) of bellows member 520A is attached to large diameter portion 501Ac of tubular accommodating portion 501A.

[0157] Next, shaft 508A is inserted from above through tubular accommodating portion 501A and bellows member 520A. At this time, small diameter portion 508Aa of shaft 508A protrudes downward from the lower end (inner flange portion 520Ab) of bellows member 520A. Also, first to third shaft seal members 504, 506, 509 are in close contact with the inner circumferential surface of small diameter portion 501Aa of tubular accommodating portion 501A.

[0158] Here, shaft portion 508A is not fixed to tubular housing portion 501A. Therefore, when the lower end of shaft portion 508A is directed downward, shaft portion 508A moves downward relative to tubular housing portion 501A. However, the outer diameter of outer flange portion 508Ag of shaft portion 508A is larger than the inner diameter of small diameter portion 501Aa of tubular housing portion 501A. Therefore, outer flange portion 508Ag abuts against the upper end surface of small diameter portion 501Aa, thereby restricting the downward movement of shaft portion 508A. Furthermore, the inner diameter of inner flange portion 520Ab of bellows member 520A is smaller than the outer diameter of medium diameter portion 508Ab of shaft portion 508A. Therefore, the lower end surface of medium diameter portion 508Ab abuts against inner flange portion 520Ab, thereby restricting the downward movement of shaft portion 508A (up to the maximum extended length of bellows portion 520Ac). Therefore, shaft portion 508A is prevented from falling off (disengaging) downward from tubular housing portion 501A. That is, outer flange portion 508Ag of shaft portion 508A and bellows member 520A function as a falling-off prevention member in the present invention.

[0159] Next, inner flange portion 520Ab of bellows member 520A is attached to small diameter portion 508Aa of shaft portion 508A by first mounting member 521A. Specifically, shaft portion 508A is pushed downward so that small diameter portion 508Aa of shaft portion 508A protrudes below second mounting member 522A. At this time, inner flange portion 520Ab of bellows member 520A is pushed downward by the lower end surface of medium diameter portion 508Ab of shaft portion 508A, and bellows portion 520Ac is extended downward. Next, small diameter portion 508Aa of shaft portion 508A is inserted into washer 523A. Next, first male thread surface 508Ai of shaft portion 508A is screwed into female thread surface 521Aa of first mounting member 521A, thereby liquid-tightly attaching inner flange portion 520Ab to small diameter portion 508Aa. As a result, bellows member 520A expands and contracts based on the reciprocating up and down movement of shaft portion 508A.

[0160] Next, with the outer flange portion 508Ag of the shank 508A inserted into the medium diameter portion 501Ab of the casing tube 501A, the temporary fixing screw 70 is inserted through the insertion hole 501Ah and screwed into the female threaded hole 508Ah1. As a result, the shank 508A is fixed to the casing tube 501A with the small diameter portion 508Aa protruding downward from the first mounting member 521A. At this time, the shank 508A is prevented from falling off in the vertical direction from the casing tube 501A. In other words, the temporary fixing screw 70 can function as a falling-off prevention member in the present invention.

[0161] In this way, the components (from the tubular housing portion 501A to the washer 523A) are assembled into an integrated transmission unit 50A. Meanwhile, the transmission unit 50A can be easily disassembled by reversing the assembly procedure described above. Therefore, the seal members (tubular seal member 503, and first to third shaft seal members 504, 506, 509) can be replaced separately and individually, for example, after replacing the transmission unit 50A described below.

[0162] In transmission unit 50A, a portion of shaft 508A is accommodated in tubular housing 501A so as to be able to reciprocate in the axial direction (up and down) of shaft 508A. That is, shaft 508A is supported by tubular housing 501A so as to be able to reciprocate in the axial direction of shaft 508A. Furthermore, in small diameter portion 501Aa, first to third shaft seal members 504, 506, 509 are in close contact with the corresponding first to third grooves 508Ad to 508Af and the inner circumferential surface of small diameter portion 501Aa. Furthermore, in large diameter portion 501Ac, outer flange portion 520Aa of bellows member 520A is in close contact with the inner circumferential surface of large diameter portion 501Ac, and inner flange portion 520Ab is attached liquid-tight to small diameter portion 508Aa of shaft 508A. As a result, the sample water W in the cell space CSA is blocked by the bellows member 520A and does not infiltrate above the bellows member 520A. The sample water W flowing along the outer peripheral surface of the shaft 508A is blocked by the inner flange 520Ab and the first to third shaft seal members 504, 506, and 509 and does not infiltrate above the tubular accommodating portion 501A (third accommodating space SA3). On the other hand, the sample water W flowing along the inner peripheral surface of the tubular accommodating portion 501A is blocked by the outer flange 520Aa and the first to third shaft seal members 504, 506, and 509 and does not infiltrate above the tubular accommodating portion 501A (third accommodating space SA3).

[0163] Furthermore, in transmission unit 50A, even if downward stress is applied to shaft portion 508A, outer flange portion 508Ag abuts against the upper end surface of small diameter portion 501Aa, thereby restricting downward movement of shaft portion 508A. In other words, shaft portion 508A does not fall off downward from casing tubular portion 501A. On the other hand, even if upward stress is applied to shaft portion 508A, bellows member 520A is attached to casing tubular portion 501A and shaft portion 508A, thereby restricting upward movement of shaft portion 508A. In other words, shaft portion 508A does not fall off upward from casing tubular portion 501A.

[0164] In this way, in transmission unit 50A, shaft 508A, which functions as a moving shaft for the reciprocating up and down movement of wiper 63A, and first to third shaft seal members 504, 506, and 509, which support shaft 508A liquid-tightly so that it can reciprocate up and down, are assembled as a single unit. As described above, small diameter portion 508Aa of shaft 508 comes into contact with liquid when device 1A is in use. Similarly, the outer peripheral surface of bellows member 520A comes into contact with liquid. That is, in device 1A, shaft 508A, which functions as a movable member that comes into contact with liquid, and first to third shaft seal members 504, 506, and 509, which function as seal members for the movable member, and bellows member 520A are unitized as a single transmission unit 50A.

[0165] ●Attaching and detaching the transmission unit (2) Next, the attachment and detachment of the transmission unit 50A in the detector 100A will be described using an example in which the transmission unit 50A is replaced. In the following description, reference will also be made to FIG.

[0166] Figure 15 is a cross-sectional view showing an example of removing the transmission unit 50A in chronological order, where (a) shows the state where the third cover 14A, drive unit 40A, transmission unit 50A, and wiper unit 60A have been removed, and (b) shows the state where the transmission unit 50A and wiper unit 60A have been removed.

[0167] First, the wiper unit 60A is removed from the shaft portion 508A.

[0168] Next, the third cover 14A is removed from the third holding portion 113A. Next, the drive unit 40A and the transmission unit 50A are removed from the unit holding portion 11A (third holding portion 113A). At this time, the transmission unit 50A is removed from the unit mounting hole 113Ah.

[0169] Next, the transmission unit 50A is removed from the drive unit 40A and the frame body 114A. At this time, the shaft portion 508A is removed from the connecting portion 44A. The shaft portion 508A is also pressed downward relative to the accommodating cylindrical portion 501A and fixed to the accommodating cylindrical portion 501A by the temporary fixing screws 70.

[0170] Next, the new transmission unit 50A is attached to the drive unit 40A. Specifically, the first male thread surface 508Ai of the shaft portion 508A is screwed into the female thread surface 44Aa of the connecting portion 44A of the drive unit 40A. At this time, the alignment member 518A abuts against the connecting portion 44A (for example, a recess corresponding to the alignment member 518A), thereby aligning the position of the transmission unit 50A relative to the drive unit 40A (the position (orientation) of the wiper 63A in the circumferential direction of the shaft portion 508A). In addition, a part of the frame body 114A abuts against the upper end surface of the outer flange portion 501Ag of the accommodating cylinder portion 501A. Furthermore, the temporary fixing screw 70 is removed from the transmission unit 50A.

[0171] Next, a new transmission unit 50A is attached to the unit mounting hole 113Ah. At this time, the transmission unit 50A is sandwiched between the unit mounting hole 113Ah and the frame body 114A. Therefore, even if the shaft 508A moves up and down, the tubular housing 501A does not move up and down with the shaft 508A. The tubular seal member 503 is in close contact with the inner circumferential surface of the unit mounting hole 113Ah and the outer groove 501Af. As a result, when the detector 100A is immersed in the sample water W, the sample water W flowing along the inner circumferential surface of the unit mounting hole 113Ah and the outer circumferential surface of the tubular housing 501A are blocked by the tubular seal member 503 and do not enter the third housing space SA3. Furthermore, the wiper unit 60A and the small-diameter portion 508Aa of the shaft 508A are disposed in the cell space CSA. When viewed from below, the long sides of the wiper 63A are arranged parallel to the exit window 22 and the entrance window 32.

[0172] Next, the third cover 14A is attached to the third holding portion 113A.

[0173] The wiper unit 60A is then attached to the shaft 508A of the new transmission unit 50A.

[0174] In this manner, in the present device 1A, simply by replacing the transmission unit 50A of the detector 100A, the movable member (shaft 508A) that comes into contact with the sample water W and its sealing members (first to third shaft sealing members 504, 506, 509, bellows member 520A) can be replaced together. In other words, the transmission unit 50A functions as a replacement cartridge for the movable member that comes into contact with the sample water W of the detector 100A and its sealing members.

[0175] Summary (2) According to the embodiment described above, the device 1A includes a detector 100A that is immersed in a water sample W and detects the quality of the water sample W. The detector 100A includes a transmission unit 50A that transmits power from a drive unit 40A to a wiper unit 60A. The transmission unit 50A includes a shaft 508A, a tubular housing 501A, first to third shaft seal members 504, 506, and 509 (internal seal members), and a tubular seal member 503 (external seal member). The shaft 508A reciprocates up and down based on the power from the drive unit 40A. The tubular housing 501A accommodates a portion of the shaft 508A so that the shaft 508A can reciprocate up and down. The first to third shaft seal members 504, 506, and 509 are accommodated in the tubular housing 501A and provide a liquid-tight seal between the shaft 508A and the tubular housing 501A. The cylindrical seal member 503 provides a liquid-tight seal between the outer peripheral surface (outer groove 501Af) of the tubular housing portion 501A and the inner peripheral surface of the unit mounting hole 113Ah. The transmission unit 50A is detachably attached to the unit mounting hole 113Ah. With this configuration, simply replacing the transmission unit 50A enables replacement of the movable member (shaft portion 508A) that comes into contact with liquid and its seal members (first to third shaft seal members 504, 506, 509, and cylindrical seal member 503). Furthermore, the transmission unit 50A is assembled before replacement. Therefore, a person replacing the transmission unit 50A can replace the movable member and its seal members together without assembling the transmission unit 50A. As a result, the time required to replace the seal members of the movable member is shortened, and problems such as incorrect orientation of the seal members do not occur. Therefore, in the present device 1A equipped with the immersion type detector 100A, the work of replacing the seal member of the movable member that comes into contact with the liquid becomes easy.

[0176] Furthermore, according to the embodiment described above, the shaft portion 508A includes a small diameter portion 508Aa and an upper end portion 508Ak. The small diameter portion 508Aa protrudes toward the cell space CSA side (lower side) of the casing cylindrical portion 501A, and the wiper unit 60A is detachably attached thereto. The upper end portion 508Ak protrudes toward the drive unit 40A side (upper side) of the casing cylindrical portion 501A. The transmission unit 50A includes an alignment member 518A that aligns the position of the wiper unit 60A relative to the drive unit 40A. The upper end portion 508Ak is detachably attached to the connecting portion 44A of the drive unit 40A. The alignment member 518A is attached to the upper end portion 508Ak. With this configuration, positioning of the detached wiper 63A is not required during replacement of the seal member of the movable member. As a result, in the present device 1A equipped with the immersion type detector 100A, the work of replacing the seal member of the movable member that comes into contact with the liquid becomes easy.

[0177] Furthermore, according to the embodiment described above, the transmission unit 50A is configured to be disassembled and reassembled. The transmission unit 50A includes anti-detachment members (medium diameter portion 501Ab, outer flange portion 508Ag, and bellows member 520A) that prevent the shaft portion 508A from falling off (disengaging) from the casing tubular portion 501A when attaching or detaching the transmission unit 50A. With this configuration, even if a person grips the casing tubular portion 501A or the shaft portion 508A when replacing the transmission unit 50A, the shaft portion 508A will not fall off from the casing tubular portion 501A. In other words, the transmission unit 50A can be easily handled when replacing it. As a result, in the present device 1A including the immersion-type detector 100A, the work of replacing the sealing member of the movable member that comes into contact with liquid is facilitated.

[0178] Furthermore, according to the embodiment described above, shaft 508A is configured to reciprocate up and down in the axial direction of shaft 508A relative to tubular housing 501A. Transmission unit 50A includes bellows member 520A, first mounting member 521A, and second mounting member 522A. Shaft 508A is inserted into bellows member 520A, and bellows member 520A is configured to expand and contract based on the reciprocating up and down movement of shaft 508A. First mounting member 521A mounts an upper end (outer flange portion 520Aa) of bellows member 520A inside tubular housing 501A. Second mounting member 522A mounts a lower end (inner flange portion 520Ab) of bellows member 520A to shaft 508A. The outer peripheral surface of bellows member 520A is configured to come into contact with sample water W. The outer peripheral surface of the upper end of bellows member 520A is in close contact with (abuts against) the inner peripheral surface of tubular accommodating portion 501A, and the inner peripheral surface of the lower end of bellows member 520A is in close contact with (abuts against) the outer peripheral surface of shaft portion 508. With this configuration, even when shaft portion 508A reciprocates up and down, bellows member 520A prevents sample water W from entering tubular accommodating portion 501A. Furthermore, bellows member 520A is attached to tubular accommodating portion 501A and shaft portion 508A. That is, shaft portion 508A is connected to tubular accommodating portion 501A via bellows member 520A. That is, bellows member 520A also functions as a fall-off prevention member in the present invention. Therefore, handling of transmission unit 50A is facilitated when replacing transmission unit 50A. As a result, in this device 1A equipped with immersion-type detector 100A, the work of replacing sealing members of movable members that come into contact with liquid is facilitated.

[0179] Furthermore, according to the embodiment described above, the detector 100A is provided with a wiper 63A that moves within the sample water W that fills the cell space CSA between the exit window 22 and the entrance window 32. With this configuration, contaminants adhering to each of the exit window 22 and the entrance window 32 are removed as the wiper 63A moves back and forth.

[0180] Other embodiments The order of disassembly and assembly of the transmission unit in the present invention is not limited to the order in each embodiment, as long as the transmission unit in the present invention is disassembled and assembled.

[0181] In the first embodiment described above, the transmission unit of the present invention may not include either the first retaining ring or the second retaining ring. In this case, the length of the large diameter portion of the accommodating cylindrical portion of the present invention in the vertical direction may be shorter than the length of the large diameter portion in the first embodiment.

[0182] Furthermore, in each of the embodiments described above, the transmission unit of the present invention may not include any of the first to third shaft seal members, or may include other seal members that come into close contact with the shafts in addition to the first to third shaft seal members. In this case, the transmission unit of the present invention may include grooves corresponding to the other seal members.

[0183] Furthermore, in each of the above-described embodiments, the material of each seal member (mounting hole seal member, cylindrical seal member, first to third shaft seal members, collar seal member, and bellows member) in the present invention is not limited to silicone rubber. That is, for example, the material of each seal member may be fluororubber.

[0184] Furthermore, the configuration of the alignment member in the present invention is not limited to the above-described embodiments. For example, the shaft portion and the transmission shaft in the present invention may have recesses and protrusions that engage with each other. Also, for example, the shaft portion in the present invention may be attached to the transmission shaft by a fastening member such as a screw.

[0185] Furthermore, in the second embodiment described above, the connecting portion of the present invention may be provided with a hole or a protrusion corresponding to the alignment member.

[0186] Furthermore, in each of the above-described embodiments, the transmission unit of the present invention does not have to include an alignment member. In this case, the position of the wiper relative to the drive unit may be adjusted, for example, by visual inspection by the person replacing the wiper.

[0187] Furthermore, in the first embodiment described above, the moving member (wiper) of the present invention may be a propeller that rotates based on the rotational motion of the shaft. In this case, the propeller agitates the sample water in the cell space, thereby constantly replacing the sample water in contact with the surfaces of the exit window and the entrance window. As a result, adhesion of foreign matter to the exit window and the entrance window is suppressed.

[0188] Furthermore, in each of the above-described embodiments, the moving member (wiper) in the present invention is not limited to a rubber wiper, but may be a brush wiper that contacts the exit window and the entrance window. Also, the material of the wiper in the present invention is not limited to silicone rubber.

[0189] Furthermore, in the first embodiment described above, the transmission unit of the present invention may not include a lubricant. In this case, the pressing member of the present invention may be a cylindrical collar that does not include an enlarged diameter portion.

[0190] Furthermore, in the first embodiment described above, the transmission unit of the present invention does not have to include a bearing. In this case, the transmission unit of the present invention may include, for example, a ring-shaped member such as a washer or a collar instead of the bearing.

[0191] Furthermore, the shape of the pressing member (push collar) in the present invention is not limited to the shape in the first embodiment, as long as it is capable of pressing the first to third shaft seal members downward.

[0192] Furthermore, in each of the embodiments described above, the transmission unit of the present invention does not have to include the anti-detachment members of the present invention (second and third retaining rings, bellows members). Even in this case, when replacing the transmission unit, the position of the shaft portion relative to the accommodating cylindrical portion is maintained to some extent by the internal seal member of the present invention.

[0193] Furthermore, in the first embodiment described above, the fall-off prevention member of the present invention is not limited to a snap ring. For example, the fall-off prevention member of the present invention may be a protrusion such as a knock pin fitted into the shaft portion.

[0194] Furthermore, in the first embodiment described above, the first to fourth retaining rings in the present invention are not limited to types C and E. That is, for example, the first to fourth retaining rings in the present invention may be round retaining rings.

[0195] Furthermore, in the first embodiment described above, the detector of the present invention does not have to include a mounting hole seal member.

[0196] Furthermore, in the first embodiment described above, only the first and second shaft seal members may function as the internal seal members of the present invention, i.e., the third shaft seal member may not function as the internal seal member of the present invention.

[0197] Furthermore, in each of the above-described embodiments, it is sufficient that the cell space of the detector is immersed in the sample water, and the entire detector does not have to be immersed in the sample water.

[0198] Furthermore, in each of the above-described embodiments, the device may be any device that includes an immersion-type detector and measures the quality of sample water using light, and is not limited to an absorbance measurement device. [Explanation of symbols]

[0199] 1. Measuring equipment 100 detectors 10. Cabinet 112h2 Unit mounting hole 21 Light source (light emitting part) 22 Exit window 31 Light receiving part 32 entrance window 40 Drive unit (drive section) 50 Transmission Unit 501 Storage tube 503 Cylindrical seal member (external seal member) 504 First shaft seal member (internal seal member) 506 Second shaft seal member (internal seal member) 508 Shaft 508a Wiper mounting portion (first end) 508e Upper end (second end) 509 Third shaft seal member (internal seal member) 510 Push collar (pressure member) 510b Large diameter section (expanded diameter section) 511 Color seal member (second internal seal member) 512 First retaining ring (anti-falling member) 513 Second retaining ring (anti-falling part) 514 Third retaining ring (anti-falling part) 515 4th retaining ring (2nd fall prevention member) 516 Bearing 518 Alignment member 519 Lubricants 63 Wiper (moving part) 1A Measuring Device 100A detector 10A housing 113Ah unit mounting hole 40A drive unit (drive part) 50A transmission unit 501A Housing tube 501Aa Small diameter part (anti-falling part) 508A Shaft 508Aa Small diameter part (1st end) 508Ag outer flange (anti-falling part) 508Ak Upper end (second end) 518A Alignment member 520A Bellows parts (internal seal parts, anti-fall parts) 520Aa Outer flange part (other end) 520Ab Inner flange (one end) 521A First mounting member 522A Second mounting member 63A Wiper (moving part)

Claims

1. A measuring device for measuring the water quality of a water sample using light, a detector at least part of which is immersed in the sample water to detect the water quality; and The detector comprises: a light emitting unit that emits the light; an exit window through which the light from the light emitting unit exits; an entrance window into which the light emitted from the exit window is incident; a light receiving section that receives the light incident on the entrance window; a moving member that moves within the sample water that fills the cell space between the exit window and the entrance window; a drive unit that supplies power for moving the moving member; a housing that houses the light emitting unit, the light receiving unit, and the driving unit; a transmission unit that transmits the power from the drive unit to the moving member; Equipped with The housing includes: a unit mounting hole disposed so as to face the cell space; Equipped with The transmission unit a shaft portion that moves based on the power; a housing tube portion that houses a part of the shaft portion so that the shaft portion can move; an internal seal member that is housed in the housing tube and that provides a liquid-tight seal between the shaft portion and the housing tube; an external seal member that liquid-tightly seals the space between the accommodating tube portion and the unit mounting hole; Equipped with The unit is detachably attached to the unit mounting hole, The shaft portion is a first end portion that protrudes from the accommodating cylindrical portion toward the cell space and to which the moving member is detachably attached; Equipped with A measuring device characterized by:

2. The shaft portion is a second end portion protruding from the accommodating cylindrical portion toward the driving portion; Equipped with The transmission unit an alignment member for aligning the position of the moving member with respect to the driving unit; Equipped with the second end is detachably attached to the drive unit; the alignment member is attached to the second end; The measuring device according to claim 1.

3. The transmission unit is configured to be disassembled and assembled, a fall-off prevention member that prevents the shaft portion from falling off from the accommodating cylindrical portion when the transmission unit is attached or detached; Equipped with 3. The measuring device according to claim 1 or 2.

4. The shaft portion is configured to rotate back and forth relative to the casing tube portion around a central axis of the shaft portion, The transmission unit a pressing member that is housed in the housing cylindrical portion and presses the internal seal member; a bearing housed in the housing cylindrical portion and assisting the reciprocating rotational motion of the shaft portion; a second anti-detachment member that is housed in the tubular housing portion and prevents the pressing member and the bearing from coming off from the tubular housing portion; a second internal seal member that provides a liquid-tight seal between the tubular housing portion and the pressing member; Equipped with The pressing member is disposed between the internal seal member and the second fall-off prevention member.

4. The measuring device according to claim 1.

5. The pressing member is an expanded diameter portion that forms a cylindrical space between the shaft portion and the expanded diameter portion; Equipped with The transmission unit a lubricant filled in the cylindrical space; Equipped with 5. The measuring device according to claim 4.

6. The shaft portion is configured to reciprocate relative to the accommodating cylindrical portion in an axial direction of the shaft portion, The transmission unit a bellows member into which the shaft portion is inserted and which expands and contracts based on the reciprocating motion of the shaft portion; a first attachment member that attaches one end of the bellows member to the shaft portion; a second attachment member that attaches the other end of the bellows member to the inside of the tubular housing portion; Equipped with an outer circumferential surface of the bellows member is configured to come into contact with the sample water; an inner circumferential surface of the one end of the bellows member abuts against an outer circumferential surface of the shaft portion; an outer circumferential surface of the other end of the bellows member abutting against an inner circumferential surface of the accommodating cylindrical portion; 4. The measuring device according to claim 1.

7. the moving member is a wiper configured to come into contact with the exit window and the entrance window.

7. The measuring device according to claim 1.

Images