Measuring device

Abstract

To achieve a measurement device that can stably remove a pollutant adhered to an emission window and an incidence window.SOLUTION: A measurement device 1 according to the present invention is a measurement device that measures a water quality of sample water by using light. The measurement device is configured to have a detector 100 having at least a part immersed in sample water to detect a water quality. The detector comprises: a light emitting unit 21 that emits light; an emission window 22 that emits the light from the light emission unit; an incidence window 32 upon which the light emitted from the emission window is incident; a light reception unit 31 that receives the light incident upon the incidence window; and a wiper 63 that makes a reciprocating motion within a cell space CS between the emission window and the incidence window filled with the sample water to clean the emission window and the incidence window. The wiper is made of a metal with elasticity, and the emission window and the incidence window are made of sapphire glass.SELECTED DRAWING: Figure 5

Description

Technical Field

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

Background Art

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

[0003] The measurement device disclosed in Patent Document 1 includes a light-emitting unit that emits light, an emission window through which light from the light-emitting unit exits, an incidence window into which the light emitted from the emission window enters, and a light-receiving unit that receives the light incident on the incidence window. A cell space filled with sample water is formed between the emission window and the incidence window. The measurement device emits light to the sample water in the cell space, and measures the water quality (turbidity) of the sample water by detecting light transmitted through the sample water or light scattered by the sample water. When the measurement device is used continuously, pollutants contained in the sample water adhere to and accumulate on the emission window and / or the incidence window. As a result, the light detection capability of the measurement device decreases, and the measurement accuracy of water quality deteriorates. Therefore, the measurement device is provided with a removal mechanism for removing pollutants adhering to the emission window and the incidence window.

[0004] The removal mechanism disclosed in Patent Document 1 comprises 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 positioned in the cell space and attached to the lower end of the rotating shaft. The rubber wiper is configured to move back and forth (reciprocating rotational motion) in the circumferential direction of the rotating shaft, contacting the exit window and the inlet window while traversing the space between the exit window and the inlet window (part of the cell space). In this removal mechanism, contaminants adhering to the exit window and the inlet window are removed as the rubber wiper moves back and forth. [Prior art documents] [Patent Documents]

[0005] [Patent Document 1] Japanese Patent Publication No. 2014-222187 [Overview of the project] [Problems that the invention aims to solve]

[0006] In this case, the reciprocating movement of the rubber wiper alone may not completely remove the contaminants that have adhered to and accumulated on the outlet window (inlet window). Therefore, in the measuring device disclosed in Patent Document 1, a fluorine coating is applied to the surfaces of both the outlet window and the inlet window to prevent the adhesion of contaminants (calcium carbonate: CaCO3). As a result, the adhesion of contaminants (CaCO3) to the outlet window and inlet window is suppressed in this measuring device.

[0007] However, in this measuring device, a rubber wiper moves back and forth while rubbing against the coated surface. As a result, the coating thins over time, and its thickness depends on the number of times the rubber wiper moves (i.e., the water quality). In addition, the sample water may contain fine, hard minerals such as gravel and sand. In this case, if these minerals get caught between the rubber wiper and the exit window (inlet window), the coating is scraped off in a linear fashion due to the movement of the minerals accompanying the movement of the rubber wiper. Thus, in this measuring device, there is a large variation in the period over which the coating is maintained, and there are technical challenges in achieving stable removal of pollutants.

[0008] The present invention aims to provide a measuring device capable of reliably removing contaminants adhering to the outlet window and the inlet window. [Means for solving the problem]

[0009] The measuring device according to the present invention is a measuring device for measuring the water quality of a sample water using light, and comprises a detector that is at least partially immersed in the sample water to detect the water quality, the detector comprising a light-emitting unit that emits light, an emission window that emits light from the light-emitting unit, an incidence window into which the light emitted from the emission window is incident, a light-receiving unit that receives the light incident on the incidence window, and a wiper that moves back and forth within a cell space between the emission window and the incidence window, which is filled with sample water, to clean the emission window and the incidence window, the wiper being made of an elastic metal, and the emission window and incidence window being made of sapphire glass. [Effects of the Invention]

[0010] According to the present invention, it is possible to provide a measuring device that can stably remove pollutants adhering to the outlet window and the inlet window. [Brief explanation of the drawing]

[0011] [Figure 1] This is a schematic diagram showing an embodiment of the measuring device according to the present invention. [Figure 2] This is a side view of the detector included in the measuring device shown in Figure 1. [Figure 3]Figure 2 is a cross-sectional view of the detector in the AA line. [Figure 4] Figure 2 is a partially enlarged cross-sectional view of the detector in the AA line. [Figure 5] Figure 4 is a partially enlarged schematic cross-sectional view showing a portion of the detector. [Figure 6] Figure 2 is a cross-sectional view of the detector along the BB line. [Figure 7] Figure 2 is a schematic diagram of the wiper provided by the detector, where (a) is a schematic view of the wiper as seen from arrow C in Figure 6, and (b) is a schematic cross-sectional view of the wiper in (a) along line DD. [Figure 8] Figure 7 is a partially enlarged schematic cross-sectional view showing the wiper in its initial position. [Figure 9] Figure 8 is a partially enlarged schematic cross-sectional view showing the state of the wiper during movement. [Figure 10] Figure 8 is a partially enlarged schematic cross-sectional view showing another state of the wiper during movement. [Figure 11] Figure 8 is a partially enlarged schematic cross-sectional view showing yet another state of the wiper during movement. [Figure 12] Figure 8 is a partially enlarged schematic cross-sectional view showing yet another state of the wiper during movement. [Figure 13] This is a partially enlarged schematic cross-sectional view showing modified versions of the measuring device according to the present invention, where (a) shows the measuring device according to the first modified version, (b) shows the measuring device according to the second modified version, (c) shows the measuring device according to the third modified version, and (d) shows the measuring device according to the fourth modified version. [Figure 14] This is a partially enlarged schematic cross-sectional view showing another modified example of the measuring device according to the present invention, where (a) shows the measuring device according to the fifth modified example, (b) shows the measuring device according to the sixth modified example, and (c) shows the measuring device according to the seventh modified example. [Figure 15] This is a partially enlarged schematic cross-sectional view showing yet another modification of the measuring device according to the present invention. [Modes for carrying out the invention]

[0012] Hereinafter, embodiments of the measuring apparatus according to the present invention (hereinafter referred to as "the present apparatus") will be described with reference to the drawings. In the following description, elements having the same structure or function are denoted by the same reference numerals, and duplicate descriptions are omitted. In addition, the dimensional ratio of each element may be exaggerated for convenience of description, and is not limited to the ratio illustrated in each drawing.

[0013] ●Measuring Apparatus● ●Configuration of Measuring Apparatus Figure 1 is a schematic diagram showing an embodiment of the present apparatus.

[0014] The present apparatus 1 measures the water quality of sample water W using light. The present apparatus 1 is, for example, an absorbance measuring apparatus that measures organic pollutants in sample water W using UV (ultraviolet) light. The present apparatus 1 includes a detector 100 and a converter 200.

[0015] "Sample water W" is the water that is the target of water quality measurement by the present apparatus 1. The sample water W is, for example, factory effluent.

[0016] Note that the sample water in the present invention is not limited to factory effluent. That is, for example, the sample water may be environmental water such as lake water, river water, or seawater.

[0017] The detector 100 emits light to the sample water W and receives the light transmitted through the sample water W, thereby detecting the water quality (absorbance) of the sample water W. The detector 100 is installed below the water surface of the sample water W. That is, the detector 100 is immersed in the sample water 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.

[0018] In the following description, "upper" refers to the direction in which the water surface is located relative to the detector 100 in the state of being immersed in the sample water W (the upper side of the paper surface of Figure 1). "Lower" refers to the direction opposite to the upper direction (the lower side of the paper surface of Figure 1).

[0019] 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 located above the water surface, for example, above the detector 100.

[0020] ● Detector configuration Figure 2 is a side view of the detector 100. Figure 3 is a cross-sectional view of detector 100 along line AA in Figure 2. For the sake of clarity, Figure 3 omits and simplifies some of the internal structure of the detector 100.

[0021] The detector 100 comprises a housing 10, a light-emitting unit 20, a light-receiving unit 30, a motor 40, a rotating shaft 50, and a wiper unit 60.

[0022] The housing 10 houses the light-emitting unit 20, the light-receiving unit 30, the motor 40, and the rotating shaft 50. The housing 10 is a roughly cylindrical body that is oriented vertically. The housing 10 includes a unit holding section 11, a bottomed cylindrical first cover 12, and a cylindrical second cover 13.

[0023] The unit holder 11 holds the light-emitting unit 20, the light-receiving unit 30, and the rotating shaft 50. The unit holder 11 comprises a first holder 111, a second holder 112, and two columnar parts 113 and 114.

[0024] The first holding portion 111 holds the light-emitting unit 20. The first holding portion 111 is a bottomed cylindrical shape with its bottom facing upward. The first holding portion 111 is provided with a window mounting hole 111h. The window mounting hole 111h is located in the ceiling wall 111a (bottom) of the first holding portion 111 and penetrates the ceiling wall 111a. The window mounting hole 111h is positioned to face the cell space CS, which will be described later. Of the upper surface 111b of the ceiling wall 111a, a portion of the area to the side of the window mounting hole 111h forms an inclined surface 111c that slopes downward.

[0025] The second holding part 112 holds the light receiving unit 30 and the rotating shaft 50. The second holding part 112 is a bottomed cylindrical shape. The second holding part 112 includes a window mounting hole 112h and a rotating shaft mounting hole (not shown; the same applies hereinafter). The window mounting hole 112h and the rotating shaft mounting hole are located in the bottom wall 112a of the second holding part 112 and penetrate the bottom wall 112a. The window mounting hole 112h and the rotating shaft mounting hole are positioned to face the cell space CS, which will be described later. Of the lower surface 112b of the bottom wall 112a, a portion of the area to the side of the window mounting hole 112h constitutes an inclined surface 112c that slopes upward. The inclined surface 112c is located above the inclined surface 111c.

[0026] The two columnar sections 113 and 114 connect the first holding section 111 and the second holding section 112 such that the upper surface 111b of the ceiling wall 111a and the lower surface 112b of the bottom wall 112a face each other. A cell space CS filled with sample water W (see Figure 1; the same applies hereafter) is formed between the upper surface 111b and the lower surface 112b.

[0027] The two window mounting holes 111h and 112h are located on the same virtual axis along the vertical direction. That is, the two window mounting holes 111h and 112h are located opposite each other, with the cell space CS in between.

[0028] The first cover 12 is liquid-tight and detachably attached to the first retaining portion 111. As a result, the first retaining portion 111 and the first cover 12 form a first housing space S1 in which the light source unit 21, described later, is housed.

[0029] The second cover 13 is liquid-tight and detachably attached to the second holding part 112. As a result, the second holding part 112 and the second cover 13 form a second housing space S2 in which the light receiving part 31, the motor 40, and the rotating shaft 50, which will be described later, are housed.

[0030] Figure 4 is a partially enlarged cross-sectional view of the detector 100 along line AA in Figure 2. Figure 5 is a partially enlarged schematic cross-sectional view showing a portion of the detector 100 in Figure 4. For the sake of clarity, Figure 4 omits and simplifies some of the internal structure of the detector 100.

[0031] 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 comprises a light source unit 21 and an emission window 22.

[0032] The light source unit 21 includes, for example, a light source (not shown; the same applies hereinafter) and a lens (not shown; the same applies hereinafter) that guides light from the light source. The light source is, for example, a semiconductor light-emitting element such as a light-emitting diode (LED). The light source unit 21 is an example of a light-emitting part in the present invention. The light source unit 21 is housed in a first housing space S1 (see Figure 3) and held in a first holding part 111.

[0033] The ejection window 22 is made of sapphire glass. The ejection window 22 is hat-shaped and comprises a cylindrical body portion 221 and a ring-shaped flange portion 222. The outer peripheral surface of the lower part of the body portion 221 protrudes radially outward from the body portion 221 to form the flange portion 222. The upper surface of the ejection window 22 (body portion 221) is circular and forms an opposing surface 22a that faces the opposing surface 32a, which will be described later. In the circumferential direction of the ejection window 22, the outer edge of the opposing surface 22a forms an inclined surface 22b that is chamfered (for example, chamfered at 45°) around its entire circumference. That is, the inclined surface 22b is adjacent to the opposing surface 22a. The inclined surface 22b is an example of a guide surface in the present invention. The ejection window 22 is liquid-tightly mounted in the window mounting hole 111h. The opposing surface 22a is positioned to protrude slightly towards the cell space CS side (upwards) from the upper surface 111b of the ceiling wall 111a, so that the wiper 63, described later, can reliably contact the opposing surface 22a. In this case, the entire inclined surface 22b is not positioned above the upper surface 111b. That is, for example, a part of the inclined surface 22b (for example, about 1 / 3 to 1 / 2 of the length of the inclined surface 22b) is positioned below the upper surface 111b.

[0034] The light-receiving unit 30 receives light transmitted through the sample water W in the cell space CS. The light-receiving unit 30 comprises a light-receiving section 31 and an incident window 32.

[0035] The light-receiving unit 31 is, for example, a semiconductor light-receiving element such as a photodiode. The light-receiving unit 31 is housed in the second housing space S2 and held in the second holding unit 112.

[0036] The entrance window 32 is made of sapphire glass. The entrance window 32 is in the shape of an inverted hat and comprises a cylindrical body portion 321 and a ring-shaped flange portion 322. The outer peripheral surface of the upper part of the body portion 321 protrudes radially outward from the body portion 321 to form the flange portion 322. The lower surface of the entrance window 32 (body portion 321) is circular and forms an opposing surface 32a. In the circumferential direction of the entrance window 32, the outer edge of the opposing surface 32a forms an inclined surface 32b that is chamfered (for example, chamfer angle 45°) around its entire circumference. The inclined surface 32b is an example of a guide surface in the present invention. The entrance window 32 is mounted in the window mounting hole 112h. The opposing surface 32a of the entrance window 32 is positioned to protrude slightly towards the cell space CS side from the lower surface 112b of the bottom wall 112a so that the wiper 63, which will be described later, can be reliably brought into contact with the opposing surface 32a. In this case, the entire inclined surface 32b is not positioned below the lower surface 112b. That is, for example, a portion of the inclined surface 32b (for example, about 1 / 3 to 1 / 2 of the length of the inclined surface 32b) is positioned above the lower surface 112b.

[0037] The opposing surface 22a of the exit window 22 is positioned parallel to and opposite the opposing surface 32a of the entrance window 32. In the vertical direction, the distance "L1" between the opposing surfaces 22a and 32a is smaller than the distance "L2" between the upper surface 111b of the ceiling wall 111a and the lower surface 112b of the bottom wall 112a. At this time, the inclined surfaces 22b and 32b are inclined such that the distance between the exit window 22 and the entrance window 32 becomes continuously narrower as they move toward adjacent opposing surfaces 22a and 32a.

[0038] Return to Figure 3. The motor 40 supplies power to move the wiper unit 60. The motor 40 is housed in the second housing space S2 with its rotation axis facing downwards.

[0039] The rotating shaft 50 transmits power from the motor 40 to the wiper unit 60, causing the wiper unit 60 to reciprocate. The rotating shaft 50 is housed in the second housing space S2 and is liquid-tight and rotatably mounted in the rotating shaft mounting hole. The lower end portion 50a of the rotating shaft 50 protrudes into the cell space CS.

[0040] Figure 6 is a cross-sectional view of detector 100 along the BB line in Figure 2. For the sake of explanation, the wiper unit 60 after moving from the position indicated by the solid line is shown with a dashed line in the same figure.

[0041] The wiper unit 60 cleans the discharge window 22 and the inlet window 32 (see Figures 3 to 5; the same applies hereafter). The wiper unit 60 comprises a wiper support member 61, a unit mounting screw 62, a wiper 63, a pair of wiper retaining plates 64 and 65, and two wiper mounting screws 66 and 67. The wiper support member 61 has an insertion hole 61h through which the lower end portion 50a of the rotating shaft 50 is inserted. The wiper 63 is attached to the wiper support member 61 by the wiper mounting screws 66 and 67 while sandwiched between the wiper retaining plates 64 and 65. The wiper support member 61 is attached to the lower end portion 50a of the rotating shaft 50 by the unit mounting screw 62.

[0042] Figure 7 is a schematic diagram of the wiper 63, where (a) is a schematic diagram of the wiper 63 as seen from arrow C in Figure 6, and (b) is a schematic cross-sectional view of the wiper 63 in (a) along line DD.

[0043] The wiper 63 is made of an elastic metal, such as stainless steel. The wiper 63 is a substantially rectangular plate shape having a first surface 63a and a second surface 63b. The wiper 63 comprises a pair of blade portions 631 and 632 and a holding portion 633. The lower end of the wiper 63 is bent in one direction (towards the first surface 63a) to form the blade portion 631. The upper end of the wiper 63 is bent in the same direction as the lower end (towards the first surface 63a) to form the blade portion 632. The central portion between the upper and lower ends of the wiper 63 constitutes the holding portion 633.

[0044] The blade portion 631 is configured to contact the opposing surface 22a (see Figures 3 to 5) of the corresponding discharge window 22 when the wiper 63 is moving, and to clean the opposing surface 22a. The blade portion 631 is trapezoidal in shape, becoming narrower towards the tip portion 631a (lower end). Although not shown, the tip portion 631a is polished to an appropriate degree to remove contaminants. Of the first surface 63a of the wiper 63, the portion located on the blade portion 631 constitutes the first surface 631b of the blade portion 631. Of the second surface 63b of the wiper 63, the portion located on the blade portion 631 constitutes the second surface 631c of the blade portion 631.

[0045] The blade portion 632 is configured to contact the opposing surface 32a (see Figures 3 to 5) of the corresponding entrance window 32 when the wiper 63 is moving, and to clean the opposing surface 32a. The blade portion 632 is trapezoidal in shape, becoming narrower towards the tip portion 632a (upper end). Although not shown, the tip portion 632a is polished to an appropriate degree to remove contaminants. Of the first surface 63a of the wiper 63, the portion located on the blade portion 632 constitutes the first surface 632b of the blade portion 632. Of the second surface 63b of the wiper 63, the portion located on the blade portion 632 constitutes the second surface 632c of the blade portion 632.

[0046] On the first surface 63a, the angle "θ1" between the blade portion 631 and the held portion 633 is obtuse (for example, 105°). The angle "θ2" between the blade portion 632 and the held portion 633 is the same obtuse angle as angle "θ1".

[0047] Return to Figures 4-7. The held portion 633 is the part of the wiper 63 that is sandwiched between the wiper retaining plates 64 and 65.

[0048] When no load is applied to the blade sections 631 and 632 as described below (no load), the distance "L3" between the tip portions 631a and 632a of the blade sections 631 and 632a in the vertical direction is greater than the distance "L1" between the opposing surfaces 22a and 32a and the distance "L2" between the upper surface 111b and the lower surface 112b. Also, in the vertical direction, the length "L4" of the held portion 633 is smaller than the aforementioned distance "L1". When no load is applied, the angle "θ11" between the first surface 631b of the blade section 631 and the virtual plane C1 passing through the tip portion 631a and parallel to the opposing surface 22a is obtuse (for example, about 165°). On the other hand, the angle "θ21" between the second surface 631c and the virtual plane C1 is acute. Similarly, the angle "θ31" between the first surface 632b of the blade portion 632 and the virtual plane C2 that passes through the tip portion 632a and is parallel to the opposing surface 32a is the same obtuse angle as angle "θ11". The angle "θ41" between the second surface 632c and the virtual plane C2 is the same acute angle as angle "θ21".

[0049] The wiper unit 60 is positioned in the cell space CS and is configured to reciprocate (reciprocating rotation) in the circumferential direction of the rotation axis 50 between an initial position P1 and a return position P2, which will be described later, in accordance with the reciprocating rotational motion of the rotation axis 50. That is, the reciprocating direction of the wiper 63 is the circumferential direction of the rotation axis 50. At this time, the discharge window 22 and the inlet window 32 are positioned between the initial position P1 and the return position P2 in the reciprocating direction of the wiper 63. The wiper 63 is configured to traverse the space between the discharge window 22 and the inlet window 32 (part of the cell space CS) with the blade portion 631 in contact with the discharge window 22 and the blade portion 632 in contact with the inlet window 32. That is, the wiper 63 is configured to reciprocate within the sample water W filling the cell space CS. As the wiper 63 reciprocates, contaminants adhering to the discharge window 22 and the inlet window 32 are removed by the blade portions 631 and 632, respectively.

[0050] ● Operation of the measuring device Next, the operation of this device 1 will be explained below, focusing on the operation of the wiper 63. Figures 4 to 7 will be referred to as appropriate in the following explanation.

[0051] Figure 8 is a partially enlarged schematic cross-sectional view showing the wiper 63 in its initial position P1. The same figure schematically shows a portion of the cross-section of the detector 100 along line AA in Figure 2.

[0052] The tip portions 631a and 632a of the wiper 63 before movement are located in the initial position P1. The "initial position P1" is radially outward from the discharge window 22 (ingress window 32), and is the position where the discharge window 22 (ingress window 32) is located on the first surface 63a side of the wiper 63. The initial position P1 is an example of the first position in the present invention. At this time, the blade portion 631 is in contact with the upper surface 111b of the ceiling wall 111a, and an upward load is applied to the blade portion 631 from the upper surface 111b. Similarly, the blade portion 632 is in contact with the lower surface 112b of the bottom wall 112a, and a downward load is applied to the blade portion 632 from the lower surface 112b. In the reciprocating direction of the wiper 63, the first surfaces 631b and 632b of the blade portions 631 and 632 are oriented toward the forward direction, and the second surfaces 631c and 632c are oriented toward the return direction. The tip portions 631a and 632a are oriented toward the forward direction (the washing direction described later). The angle "θ12" between the first surface 631b and the upper surface 111b is the same as the angle "θ32" between the first surface 632b and the lower surface 112b, and is an obtuse angle that is slightly larger than the angle "θ11". On the other hand, the angle "θ22" between the second surface 631c and the upper surface 111b is the same as the angle "θ42" between the second surface 632c and the lower surface 112b, and is an acute angle that is slightly smaller than the angle "θ21".

[0053] Figure 9 is a partially enlarged schematic cross-sectional view showing the state of the wiper 63 in motion. The figure schematically shows a portion of the cross-section of detector 100 along line AA in Figure 2.

[0054] Next, as the wiper 63 moves in the forward direction (the direction in which the tip portions 631a and 632a are facing), the tip portion 631a contacts the inclined surface 22b of the discharge window 22, and the tip portion 632a contacts the inclined surface 32b of the entrance window 32. That is, the blade portions 631 and 632 first contact the inclined surfaces 22b and 32b of the corresponding discharge window 22 and entrance window 32. At this time, the angle "θ13" between the first surface 631b and the inclined surface 22b is the same obtuse angle "θ33" as the angle "θ33" between the first surface 632b and the inclined surface 32b. On the other hand, the angle "θ23" between the second surface 631c and the inclined surface 22b is the same acute angle "θ43" as the angle "θ43" between the second surface 632c and the inclined surface 32b.

[0055] Next, as the wiper 63 moves in the forward direction, the tip 631a is pushed toward the corresponding inclined surface 22b. At this time, since the angle "θ13" is obtuse, the tip 631a rises along the inclined surface 22b, and the blade portion 631 is pushed upward in such a way that the angle "θ1" decreases. Similarly, the tip 632a descends along the inclined surface 32b, and the blade portion 632 is pushed downward in such a way that the angle "θ2" decreases. In other words, the wiper 63 deforms in such a way that the distance "L3" between the tip portions 631a and 632a decreases in the vertical direction. After that, the tip 631a is guided toward the opposing surface 22a along the inclined surface 22b and reaches the opposing surface 22a. Meanwhile, the tip 632a is guided toward the opposing surface 32a along the inclined surface 32b and reaches the opposing surface 32a.

[0056] Figure 10 is a partially enlarged schematic cross-sectional view showing another state of the wiper 63 in motion. The figure schematically shows a portion of the cross-section of detector 100 along line AA in Figure 2.

[0057] When blade portion 631 is in contact with the corresponding opposing surface 22a and blade portion 632 is in contact with the corresponding opposing surface 32a, in the vertical direction, blade portions 631 and 632 are compressed compared to when the wiper 63 was in its initial position P1 (see Figure 7; the same applies hereafter). The distance "L3" between the tip portions 631a and 632a is slightly reduced compared to the same distance "L3" in the initial position P1, and is approximately the same as the distance "L1" between the opposing surfaces 22a and 32a. At this time, the angle "θ14" between the first surface 631b and the opposing surface 22a is the same as the angle "θ34" between the first surface 632b and the opposing surface 32a, and is an obtuse angle slightly larger than the angle "θ12" (see Figure 8). On the other hand, the angle "θ24" between the second surface 631c and the opposing surface 22a is the same as the angle "θ44" between the second surface 632c and the opposing surface 32a, and is a slightly smaller acute angle than the angle "θ22" (see Figure 8). The tip portions 631a and 632a are pressed against the corresponding opposing surfaces 22a and 32a by the elastic force of the wiper 63 (blade portions 631 and 632). Also, as mentioned above, in the vertical direction, the length "L4" of the held portion 633 is smaller than the gap "L1". Therefore, while the wiper 63 is moving, the held portion 633 can pass between the opposing surfaces 22a and 32a without getting caught on them.

[0058] Next, as the wiper 63 moves in the forward direction, the blade portion 631 moves along the opposing surface 22a in the forward direction with its tip portion 631a pressed against the corresponding opposing surface 22a. At this time, any contaminants adhering to the opposing surface 22a are removed by the blade portion 631, and the opposing surface 22a is cleaned by the blade portion 631. Similarly, the blade portion 632 moves along the opposing surface 32a in the forward direction with its tip portion 632a pressed against the corresponding opposing surface 32a. At this time, any contaminants adhering to the opposing surface 32a are removed by the blade portion 632, and the opposing surface 32a is cleaned by the blade portion 632. In other words, the forward direction is an example of a cleaning direction in this invention.

[0059] Figure 11 is a partially enlarged schematic cross-sectional view showing yet another state of the wiper 63 during movement. The figure schematically shows a portion of the cross-section of detector 100 along line AA in Figure 2.

[0060] Next, as the wiper 63 moves in the forward direction, the blade portion 631 crosses the opposing surface 22a, and the tip portion 631a comes into contact with the upper surface 111b. At this time, the second surface 631c comes into contact with the boundary (corner) between the opposing surface 22a and the inclined surface 22b. Similarly, the blade portion 632 crosses the opposing surface 32a, and the tip portion 632a comes into contact with the lower surface 112b. At this time, the second surface 632c comes into contact with the boundary (corner) between the opposing surface 32a and the inclined surface 32b.

[0061] Figure 12 is a partially enlarged schematic cross-sectional view showing yet another state of the wiper 63 during movement. The figure schematically shows a portion of the cross-section of detector 100 along line AA in Figure 2.

[0062] Next, as the wiper 63 moves in the forward direction, the tip portions 631a and 632a move to the turning point P2 between the inclined surfaces 111c and 112c, and the forward movement of the wiper 63 is stopped. The "turning point P2" is the position where the direction of movement of the wiper 63 is reversed to the return direction, and is radially outward of the discharge window 22 (ingress window 32), and is the position where the discharge window 22 (ingress window 32) is located on the second surface 63b side of the wiper 63. The turning point P2 is an example of the second position in the present invention. At this time, the wiper 63 is not in contact with the ceiling wall 111a and the bottom wall 112a. As a result, due to the elasticity of the wiper 63 itself, the distance "L3" between the tip portions 631a and 632a returns to the distance of the unloaded state. Also, the pollutants removed by the wiper 63 are released between the inclined surfaces 111c and 112c.

[0063] Return to Figures 8-12. Next, the wiper 63 moves from the turning position P2 in the return direction (the direction in which the tip portions 631a and 632a are not facing). As the wiper 63 moves in the return direction, as shown in Figure 11, the second surfaces 631c and 632c of the blade portions 631 and 632 come into contact with the boundary (corner) between the opposing surfaces 22a and 32a and the inclined surfaces 22b and 32b. Furthermore, as the wiper 63 moves in the return direction, the blade portion 631 is pushed upward by the boundary, and the blade portion 632 is pushed downward by the boundary. In other words, the wiper 63 deforms in the vertical direction to reduce the distance "L3" between the tip portions 631a and 632a.

[0064] Furthermore, as the wiper 63 moves in the return direction, the blade portions 631 and 632 come into contact with the corresponding opposing surfaces 22a and 32a, as shown in Figure 10. As the wiper 63 moves further in the return direction, the tip portions 631a and 632a come into contact with the inclined surfaces 22b and 32b, as shown in Figure 9. As the wiper 63 moves further in the return direction, the tip portions 631a and 632a move along the inclined surfaces 22b and 32b, and in the vertical direction, the wiper 63 deforms in such a way that the distance "L3" between the tip portions 631a and 632a increases. Then, as shown in Figure 8, the wiper 63 returns to its initial position P1.

[0065] Thus, in this device 1, as shown in Figure 9, the parts of the discharge window 22 and the inlet window 32 that the blade portions 631 and 632 contact before the opposing surfaces 22a and 32a are the inclined surfaces 22b and 32b. Furthermore, the angle "θ13" between the first surface 631b and the inclined surface 22b and the angle "θ33" between the first surface 632b and the inclined surface 32b are both obtuse angles. Therefore, in this device 1, even if the blade portions 631 and 632 are located radially outward from the discharge window 22 and the inlet window 32 at the initial position P1, the wiper 63 can reciprocate without getting caught on the discharge window 22 and the inlet window 32.

[0066] Furthermore, this device 1 uses a metal wiper 63 equipped with blade sections 631 and 632, which is elastic. Therefore, in this device 1, the wiper 63 can be deformed, and the wiper 63 (blade sections 631 and 632) can be pressed against the outlet window 22 and the inlet window 32 by the elastic force of the wiper 63 itself. Consequently, this device 1 is able to remove pollutants adhering to the outlet window 22 and the inlet window 32 more effectively than conventional measuring devices that use rubber wipers (hereinafter referred to as "conventional devices"). In other words, the pollutant removal efficiency of this device 1 is higher than that of conventional devices.

[0067] Furthermore, in this device 1, the metal blade sections 631 and 632 come into contact with the opposing surfaces 22a and 32a. Therefore, in this device 1, it is less likely that minerals will get trapped between the wiper 63 and the opposing surfaces 22a and 32a than in conventional devices (in the case of rubber wipers, the rubber itself deforms, making it easier for minerals to become embedded). Moreover, in this device 1, an exit window 22 and an entrance window 32 made of sapphire glass are used. The hardness of sapphire glass is higher than that of minerals such as sand (e.g., silicon dioxide) and glass (quartz). Therefore, even if minerals are trapped between the wiper 63 and the opposing surfaces 22a and 32a, scratches will hardly occur on the exit window 22 and the entrance window 32. On the other hand, if the exit window and entrance window were made of glass, the hardness of glass would be lower than that of minerals such as sand, and scratches would easily occur on the exit window and the entrance window. Therefore, in this device 1, deterioration of the outlet window 22 and the inlet window 32 due to scratches is less likely to occur than in conventional devices, resulting in higher efficiency in removing pollutants. In other words, this device 1 can stably remove pollutants.

[0068] ●Differentiation● Next, a modified version of the device 1 (detector 100) will be described below. In the following modified versions, for the sake of explanation, the same components as in the previous embodiment (hereinafter referred to as the "first embodiment") and components having common functions are denoted by the same reference numerals as in the first embodiment. In the following modified versions, some parts of the detector configuration differ from that of the first embodiment.

[0069] Figure 13 is a partially enlarged schematic cross-sectional view showing modified versions of the apparatus 1, where (a) shows detector 100A according to the first modified version, (b) shows detector 100B according to the second modified version, (c) shows detector 100C according to the third modified version, and (d) shows detector 100D according to the fourth modified version. Figure 14 is a partially enlarged schematic cross-sectional view showing another modified example of the apparatus 1, where (a) shows the detector 100E according to the fifth modified example, (b) shows the detector 100F according to the sixth modified example, and (c) shows the detector 100G according to the seventh modified example.

[0070] ●First variation In the first modified example, the initial position P1 is different from that of the first embodiment. In the first modified example, when the tip portions 631a and 632a of the wiper 63 are in the initial position P1, the tip portions 631a and 632a are in contact with the corresponding opposing surfaces 22a and 32a. At this time, the tip portions 631a and 632a are directed towards the center of the opposing surfaces 22a and 32a with which they are in contact. Also, when the wiper 63 is in the folded position P2, the blade portions 631 and 632 are in contact with the corresponding opposing surfaces 22a and 32a. In this configuration, the diameters of the exit window 22 and the entrance window 32 are designed to be sufficiently larger than the optical path, so that the wiper 63 does not block light from the light source when not cleaning.

[0071] In this first modified example, it is not necessary to guide the blade portions 631 and 632 to the corresponding opposing surfaces 22a and 32a in the forward direction of the wiper 63. Therefore, in the first modified example, the exit window 22 and the entrance window 32 do not need to have inclined surfaces 22b and 32b, respectively.

[0072] Furthermore, in the first modified example, the folding position may be located radially outward from both the exit window 22 and the entrance window 32, similar to the first embodiment.

[0073] ● Second variation In the second modification, the orientation of the blade portions 631 and 632 differs from that of the first embodiment. In the second modification, the blade portions 631 and 632 are bent toward the second surface 63b side of the wiper 63. In this configuration, the operation of the wiper 63 when moving from the initial position P1 to the folded position P2 is the same as the operation of the wiper 63 in the return direction of the first embodiment, and the operation of the wiper 63 when moving from the folded position P2 to the initial position P1 is the same as the operation of the wiper 63 in the forward direction of the first embodiment. In the second modification, the folded position P2 is an example of the first position in the present invention, and the initial position P1 is an example of the second position in the present invention. Also, in the second modification, the movement of the wiper 63 from the folded position P2 to the initial position P1 is the movement of the wiper 63 in the forward direction (washing direction). On the other hand, the movement of the wiper 63 from the initial position P1 to the folded position P2 is the movement of the wiper 63 in the return direction.

[0074] ●Third variation In the third modified example, the orientation of the blade portion 632 differs from that of the first embodiment. In the third modified example, the blade portion 631 is bent toward the first surface 63a side of the wiper 63, and the blade portion 632 is bent toward the second surface 63b side of the wiper 63. In this configuration, during the reciprocating movement of the wiper 63, the blade portion 631 deforms in the same way as the blade portion 631 of the first embodiment, and the blade portion 632 deforms in the same way as the blade portion 632 of the second modified example. In the third modified example, the initial position P1 is an example of a first position relative to the blade portion 631 and an example of a second position relative to the blade portion 632. On the other hand, the folded position P2 is an example of a second position relative to the blade portion 632 and an example of a first position relative to the blade portion 632. Furthermore, in the third modified example, the movement of the wiper 63 from the initial position P1 to the folded position P2 is a movement in the forward direction (washing direction) relative to the blade portion 631 and a movement in the return direction relative to the blade portion 632. On the other hand, the movement of the wiper 63 from the folded position P2 to the initial position P1 is a movement in the return direction for the blade portion 631, and a movement in the forward direction (washing direction) for the blade portion 632.

[0075] In this third modified example, the blade portion 631 may be bent toward the second surface 63b of the wiper 63, or the blade portion 631 may be bent toward the first surface 63a of the wiper 63.

[0076] ●Fourth variation In the fourth modification, the direction of light emission from the light source differs from that of the first embodiment. In the fourth modification, light from the light source is emitted in a direction perpendicular to the vertical direction (for example, left-right direction). The emission window 22 and the incidence window 32 are arranged so that their opposing surfaces 22a and 32a face each other in a direction perpendicular to the vertical direction. The first surface 63a of the wiper 63 is directed downward, and the second surface 63b is directed upward. In the initial position P1, the blade portions 631 and 632 are bent toward the first surface 63a. The wiper 63 is configured to reciprocate linearly in the vertical direction.

[0077] ● Fifth variation In the fifth modified example, the arrangement of the inclined surfaces 22b and 32b differs from that of the first embodiment. In the fifth modified example, the inclined surface 22b is arranged only in the portion where the tip portions 631a and 632a abut (the outer edge on the initial position P1 side with respect to the opposing surface 22a) and its vicinity in the forward direction relative to the blade portions 631 and 632.

[0078] ●6th variation In the sixth modification, the shape of the outer edges of the opposing surfaces 22a and 32a differs from that of the first embodiment. In the fifth modification, the outer edges of the opposing surfaces 22a and 32a form quarter-circular curved surfaces 22c and 32c that are convex toward the cell space CS in cross-sectional view. In other words, these outer edges are curved so that the distance between the exit window 22 and the entrance window 32 narrows continuously, forming curved surfaces 22c and 32c that are convex toward the cell space CS. In this case, when the wiper 63 moves in the forward direction and the tip portions 631a and 632a come into contact with the curved surfaces 22c and 32c, the angle between the first surfaces 631b and 632b and the curved surfaces 22c and 32c is determined based on the tangent at the point where the tip portions 631a and 632a are in contact.

[0079] ●7th variation In the seventh modification, the wiper unit 60 differs from the first embodiment in that it comprises two wipers 63A and 63B. The configuration of wiper 63A is the same as that of wiper 63 in the first embodiment. The configuration of wiper 63B is the same as that of wiper 63 in the second modification. Wiper 63A is positioned back-to-back with wiper 63B. In this configuration, during the reciprocating movement of wipers 63A and 63B, the blade portions 631A and 632A of wiper 63A deform in the same way as the blade portions 631 and 632 in the first embodiment, and the blade portions 631B and 632B of wiper 63B deform in the same way as the blade portions 631 and 632 in the second modification. In the seventh modification, the initial position P1 is an example of a first position relative to the blade portions 631A and 632A, and an example of a second position relative to the blade portions 631B and 632B. On the other hand, the folding position P2 is an example of a second position for blade sections 631A and 632A, and an example of a first position for blade sections 631B and 632B. Furthermore, in the seventh modified example, the movement of wipers 63A and 63B from the initial position P1 to the folding position P2 is in the forward direction (washing direction) for blade sections 631A and 632A, and in the return direction for blade sections 631B and 632B. On the other hand, the movement of wipers 63A and 63B from the folding position P2 to the initial position P1 is in the return direction for blade sections 631A and 632A, and in the forward direction (washing direction) for blade sections 631B and 632B.

[0080] ●Summary According to the embodiment described above, the wiper 63 is made of an elastic metal. The outlet window 22 and the inlet window 32 are made of sapphire glass. With this configuration, the device 1 can remove pollutants more efficiently than conventional devices. Furthermore, even if minerals are caught between the wiper 63 and the opposing surfaces 22a and 32a, the outlet window 22 and the inlet window 32 will hardly be scratched. Therefore, the device 1 is less prone to deterioration of the outlet window 22 and the inlet window 32 due to scratches than conventional devices, and has a higher efficiency in removing pollutants. In other words, the device 1 can stably remove pollutants.

[0081] Furthermore, according to the embodiment described above, the wiper 63 includes a pair of blade portions 631 and 632 configured to contact corresponding opposing surfaces 22a and 32a when the wiper 63 is moving back and forth. Each of the blade portions 631 and 632 includes a first surface 631b and 632b on the forward direction side of the wiper 63, and a second surface 631c and 632c on the return direction side of the wiper 63. The tip portions 631a and 632a of the blade portions 631 and 632 are oriented in the forward direction. Under no load, the distance "L3" between the tip portions 631a and 632a is greater than the distance "L1" between the opposing surfaces 22a and 32a. The angles "θ11, θ31" between the virtual planes C1, C2 and the first surfaces 631b, 632b are obtuse angles, and the angles "θ21, θ41" between the virtual planes C1, C2 and the second surfaces 631c, 632c are acute angles. With this configuration, during the forward stroke of the wiper 63, the blade portions 631, 632 are pressed against the corresponding opposing surfaces 22a, 32a, allowing them to remove contaminants by scraping them off.

[0082] Furthermore, according to the embodiment described above, the discharge window 22 and the inlet window 32 are each provided with inclined surfaces 22b and 32b. The inclined surfaces 22b and 32b are surfaces that, when the wiper 63 moves in the forward direction, cause the tip portions 631a and 632a (blade portions 631 and 632) to contact the opposing surfaces 22a and 32a before they contact the opposing surfaces 22a and 32a, guiding the tip portions 631a and 632a toward the opposing surfaces 22a and 32a. With this configuration, even if the discharge window 22 and the inlet window 32 each protrude into the cell space CS, the tip portions 631a and 632a are guided toward the opposing surfaces 22a and 32a, so the wiper 63 does not get caught on the discharge window 22 and the inlet window 32.

[0083] Furthermore, according to the embodiment described above, the inclined surfaces 22b and 32b are inclined such that the distance between the discharge window 22 and the inlet window 32 continuously narrows as they move toward adjacent opposing surfaces 22a and 32a. When the tip portions 631a and 632a are in contact with the inclined surfaces 22b and 32b, the angles "θ13, θ33" between the first surfaces 631b and 632b and the inclined surfaces 22b and 32b are obtuse angles, and the angles "θ23, θ43" between the second surfaces 631c and 632c and the inclined surfaces 22b and 32b are acute angles. With this configuration, the tip portions 631a and 632a are reliably guided toward the opposing surfaces 22a and 32a, so that the wiper 63 does not get caught in the discharge window 22 and the inlet window 32.

[0084] Furthermore, according to the embodiment described above, the wiper 63 reciprocates between an initial position P1 and a return position P2. The discharge window 22 and the inlet window 32 are located between the initial position P1 and the return position P2 in the reciprocating direction of the wiper 63. When the wiper 63 is in the initial position P1, the tip portions 631a and 632a are directed toward the corresponding discharge window 22 or inlet window 32. With this configuration, the wiper 63 traverses between the discharge window 22 and the inlet window 32 only during cleaning (reciprocating movement), and is not located between the discharge window 22 and the inlet window 32 when not cleaning. Here, in the first modified example, if the diameters of the discharge window 22 and the inlet window 32 are small, the blade portions 631 and 632 may block a portion of the light from the light source even when not cleaning. On the other hand, in this configuration, when not being cleaned, the blade sections 631 and 632 do not block light from the light source, regardless of the size of the exit window 22 and the entrance window 32, respectively.

[0085] ●Other In this invention, it is sufficient that the cell space of the detector is immersed in the sample water, and the entire detector does not need to be immersed in the sample water.

[0086] Furthermore, in the present invention, the device may be any device equipped with an immersion-type detector that measures the water quality of a sample water using light, and is not limited to an absorbance measuring device. That is, for example, the device may be a turbidity measuring device (turbidimeter) that measures turbidity.

[0087] Furthermore, in the present invention, the initial position and the folded position are not limited to the first embodiment. That is, for example, as illustrated in the first modified example, the initial position and / or folded position may be located on corresponding opposing surfaces.

[0088] Furthermore, in the present invention, the orientation of the blade portion is not limited to the first embodiment. That is, for example, as illustrated in the second modification, the orientation of the blade portion may be reversed from that of the first embodiment. Also, for example, as illustrated in the third modification, the orientation of the blade portion may be staggered with respect to the held portion. Furthermore, for example, as shown in the seventh modification, two wipers may be arranged back-to-back, with the blade portions facing either direction in the direction of the wiper's forward and backward movement.

[0089] Furthermore, in the present invention, the direction of light emission from the light source is not limited to the first embodiment. That is, for example, as illustrated in the fourth modification, the direction of light emission from the light source may be perpendicular to the vertical direction. In this case, the reciprocating direction of the wiper is determined by the orientation in which the opposing surfaces are arranged.

[0090] Furthermore, in the present invention, the arrangement of the inclined surfaces in the exit window and the entrance window is not limited to the first embodiment. That is, for example, as illustrated in the fifth modification, the inclined surfaces may be arranged only on the outer edge on the initial position side with respect to the opposing surface.

[0091] Furthermore, in the present invention, the shape of the outer edge of the opposing surface is not limited to the first embodiment. That is, for example, as illustrated in the sixth modification, the outer edge of the opposing surface may be a curved surface. Also, for example, the chamfer angle of the inclined surface is not limited to this embodiment, as long as the angle between the inclined surface and the blade portion (first surface) is obtuse. That is, for example, the chamfer angle of the inclined surface may be formed to be less than 45° with respect to the virtual extension surface of the opposing surface. Furthermore, for example, the outer edge may be configured as an inclined surface or a curved surface only in the portion that the tip of the blade portion contacts, and the portion that does not contact the tip portion does not need to be configured as an inclined surface or a curved surface.

[0092] Furthermore, in the present invention, the first embodiment and each of its modifications may be combined as appropriate, as long as the tip of the wiper does not get caught in the exit window and the entrance window when it moves back and forth.

[0093] Furthermore, in the embodiments described above, the rotating shaft 50 was mechanically connected to the rotating shaft of the motor 40. Alternatively, the rotating shaft may be magnetically coupled to the rotating shaft of the motor.

[0094] Figure 15 is a partially enlarged schematic cross-sectional view showing a detector 100H according to another modified example of the present invention (eighth modified example). For the sake of explanation, only a portion of the detector 100H is shown in this figure in an enlarged view. The differences between the eighth modified example and the previously described embodiment will be explained below. Figures 1 to 4 will also be referred to as appropriate in the following explanation.

[0095] In the eighth modified example, the detector 100H comprises a housing 10, a light-emitting unit 20, a light-receiving unit 30, a motor 40, a mounting member 41, a first magnet 42, a rotating shaft 51, a second magnet 52, and a wiper unit 60.

[0096] The first retaining portion 111 includes a recess 111h2. The recess 111h2 is located on the upper surface 111b of the ceiling wall 111a. The second retaining portion 112 includes a recess 112h2 instead of a rotating shaft mounting hole (not shown). The recess 112h2 is located on the bottom wall 112a of the second retaining portion 112, opposite the recess 111h2 across the cell space CS.

[0097] The mounting member 41 is a member for attaching the first magnet 42 to the rotating shaft 40a of the motor 40. The mounting member 41 has a cylindrical holding portion 41a. The mounting member 41 is attached to the rotating shaft 40a with the holding portion 41a facing downwards. The first magnet 42 is magnetically coupled to the second magnet 52 to transmit the power of the motor 40 to the second magnet 52. The first magnet 42 is fitted into the holding portion 41a. The first magnet 42 is, for example, cylindrical with an inner diameter larger than the recess 112h2, and is made of a permanent magnet such as neodymium.

[0098] The rotating shaft 51 transmits power from the motor 40 to the wiper unit 60, causing the wiper unit 60 to reciprocate. The rotating shaft 51 is located in the cell space CS. The second magnet 52 is magnetically coupled with the first magnet 42 to transmit power from the motor 40 to the rotating shaft 51. The second magnet 52 is a permanent magnet such as neodymium, and is cylindrical in shape with an outer diameter smaller than the recess 112h2. The second magnet 52 is attached to the upper end 51a of the rotating shaft 51 by fitting the upper end 51a of the rotating shaft 51 into the second magnet 52. The lower end 51b of the rotating shaft 51 is inserted into the recess 111h2, and the second magnet 52 is located within the recess 112h2. That is, the second magnet 52 is located within the first magnet 42 together with the recess 112h2. At this time, the rotating shaft 51 is located on the same axis as the rotating shaft 40a of the motor 40. When the motor 40 operates, the rotating shaft 40a rotates, causing the first magnet 42 to rotate. At this time, the second magnet 52 rotates due to the magnetic coupling between the first magnet 42 and the second magnet 52, and the rotating shaft 51 is configured to rotate guided by the two recesses 111h2 and 112h2. In this way, the rotating shaft 51 is rotated by the magnetic coupling between the first magnet 42 and the second magnet 52, eliminating the need for a seal on the rotating shaft 51 and improving the liquid-tightness of the housing 10.

[0099] In the eighth modified example, the shape of the second magnet is not limited to a cylindrical shape. That is, for example, the second magnet may be cylindrical, or it may be shaped like a cage rotor holding multiple magnets.

[0100] Furthermore, in the eighth modified example, the mounting member may be configured to move vertically together with the rotation axis. In this case, for example, when the motor rotates the rotation axis, the mounting member may descend, and when the motor does not rotate the rotation axis, the mounting member may rise.

[0101] Furthermore, in the eighth modified example, the rotating shaft only needs to rotate together with the motor's rotating shaft via magnetic coupling, and the configuration of the magnetic coupling is not limited to the configuration shown in Figure 15. [Explanation of symbols]

[0102] 1. Measuring device 100 detectors 21 Light source unit (light-emitting part) 22 Ejection window 22a Opposing surface 22b Inclined surface (guide surface) 22c curved surface (guide surface) 31 Light receiving part 32 Entrance window 32a Opposite side 32b Inclined surface (guide surface) 32c curved surface (guide surface) 63 Wiper 63a 1st page 63b 2nd side 631 Blade section 631a Tip 631b 1st page 631c 2nd page 632 Blade section 632a Tip 632b 1st page 632c 2nd page 63A Wiper 631A Blade section 631aA Tip 632A Blade section 632aA Tip 63B Wiper 631B Blade section 631aB Tip 632B Blade section 632aB Tip 100A detector (first modified example) 100B detector (second modified example) 100C detector (third modified example) 100D detector (fourth modified example) 100E detector (5th modified example) 100F detector (6th modified example) 100G detector (7th modified example) 100H detector (8th modified example) CS cell space P1 Initial position (1st position) P2 Turnaround Position (2nd Position)

Claims

1. A measuring device that uses light to measure the water quality of a sample, A detector that detects the water quality, at least a portion of which is immersed in the sample water, It has, The detector is The light-emitting part that emits the aforementioned light, An emission window from which the light emitted from the light-emitting unit is emitted, An incident window into which the light emitted from the aforementioned exit window enters, A light receiving unit that receives the light incident on the incident window, A wiper that moves back and forth within the cell space between the discharge window and the inlet window, which is filled with the sample water, to clean the discharge window and the inlet window, Equipped with, The exit window and the entrance window are, It is made of sapphire glass, Mutually opposing surfaces, Equipped with, The aforementioned wiper, It is made of elastic stainless steel, A pair of blade portions configured to contact the corresponding opposing surfaces when the wiper moves back and forth, Equipped with, Each of the pair of blade portions is, The first surface of the wiper on the forward direction side, The second surface of the wiper on the return direction side, Equipped with, The tip of each of the pair of blade sections is directed in the direction of cleaning by the wiper. When no load is applied to the blade portion, The distance between the aforementioned tip portions is greater than the distance between the aforementioned opposing surfaces. The angle between the first surface and a virtual plane parallel to the opposing surface passing through the tip is obtuse, and the angle between the virtual plane and the second surface is acute. A measuring device characterized by the following features.

2. The exit window and the entrance window are, A guide surface adjacent to the opposing surface, which, in the forward path of the wiper, contacts the tip portion before the opposing surface and guides the blade portion toward the opposing surface. Equipped with, The measuring device according to claim 1.

3. The guide surface is an inclined surface or a curved surface that slopes such that the distance between the exit window and the inlet window continuously narrows as it approaches the adjacent opposing surface. When the tip portion contacts the corresponding guide surface, the angle between the first surface and the guide surface is obtuse, and the angle between the second surface and the guide surface is acute. The measuring device according to claim 2.

4. The wiper moves back and forth between a first position and a second position. When the wiper is in the first position, The blade portion contacts the corresponding opposing surface, The tip portion is directed toward the center of the opposing surface that is in contact with it. The measuring device according to any one of claims 1 to 3.

5. The wiper moves back and forth between a first position and a second position. The discharge window and the inlet window are positioned between the first position and the second position in the reciprocating direction of the wiper. When the wiper is in the first position, the tip is directed toward the corresponding exit window or the entrance window. The measuring device according to claim 2 or 3.

Images