Measuring device

Abstract

Provided is a measuring device provided with a water receiving tank that does not require complicated processing during manufacturing. The measuring device is provided with: a measuring unit (5) for measuring the water quality of a water sample; and a water receiving tank (2) which is molded by resin molding and receives the water sample supplied to the measuring unit (5). The water receiving tank (2) is provided with: a circular bottom (11); a peripheral wall part (12) which extends upwards from the outer peripheral edge of the bottom part (11) to form a cylindrical shape and defines a container part (10) with an upward opening together with the bottom part; an inflow pipe part (20) which has a cylindrical shape, is connected to a supply path (La) through which the water sample supplied to the container part flows, and causes the water sample to flow to the container part; and a baffle (60) for changing the flow direction of the water sample flowing in from the inflow pipe part. The inflow pipe part is provided with an inflow port (23) which is opened at the lower part of the inner peripheral surface (12c) of the peripheral wall part. The baffle plate is in a plate shape along the vertical direction and is arranged at the bottom part in a manner of facing the inflow port.

Description

Technical Field

[0001] The utility model relates to a measuring device. Background Art

[0002] Measuring devices for measuring water quality (for example, total nitrogen concentration, total phosphorus concentration, heavy metal concentration, chemical oxygen demand (COD), etc.) are used to measure the quality of environmental water (factory drainage, lakes, rivers, or seawater, etc.). In such measuring devices, water to be measured (hereinafter referred to as "water sample") is collected by a water pump and supplied to a water receiving tank (for example, refer to Patent Document 1 and Non-Patent Document 1). A certain amount of water sample is always stored inside the water receiving tank by releasing the pressure from the water pump by allowing the water sample to overflow. A floating switch is arranged inside the water receiving tank to detect whether there is a water sample inside the water receiving tank.

[0003] Prior art literature

[0004] Patent Literature:

[0005] Patent Document 1: Japanese Patent Application Publication No. 2014-222187

[0006] Non-patent literature:

[0007] Non-patent document 1: Instruction manual "Automatic measuring device for total nitrogen and total phosphorus / chemical oxygen demand NPW-160", DKK East Asia Co., Ltd., July 2016, p34 Utility Model Content

[0008] Problems to be solved by utility models

[0009] The water receiving tank is formed into a complex shape such as a double cylinder in order to allow the water sample to overflow. Therefore, in order to manufacture the water receiving tank, complex processing is required, and the manufacturing cost is high. In addition, in terms of the structure for causing the water sample to overflow, the water sample is introduced from the bottom of the water receiving tank (the inner cylinder). If the water sample is introduced from the side of the water receiving tank, further processing is required to introduce the water sample into the inner cylinder. In addition, the inner cylinder is relatively narrow, and if a vortex flow is generated in the cylinder, the water surface will become an inverted cone, and the float switch may malfunction.

[0010] The utility model aims to provide a measuring device, which is provided with a water receiving tank which does not require complicated processing during manufacturing.

[0011] Solutions for solving problems

[0012] The measuring device of the utility model is a measuring device for measuring the water quality of a water sample, and is characterized in that it comprises: a measuring part, which measures the water quality of the water sample; and a water receiving trough, which is formed by resin molding and receives the water sample supplied to the measuring part, and the water receiving trough comprises: a bottom, which is circular; a peripheral wall part, which extends upward from the outer peripheral edge of the bottom in a cylindrical shape, and together with the bottom defines a container part opening upward; an inflow pipe part, which is cylindrical and is connected to a supply path for the water sample supplied to the container part to flow, so that the water sample flows into the container part; and a baffle, which changes the flow direction of the water sample flowing in from the inflow pipe part, the inflow pipe part comprises an inflow port opening at the lower part of the inner peripheral surface of the peripheral wall part, and the baffle is in the shape of a plate along the up-down direction, and is arranged at the bottom in a manner opposite to the inflow port.

[0013] Effect of utility model

[0014] By adopting the utility model, a measuring device with a water receiving tank which does not require complicated processing during manufacturing can be provided. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 A schematic diagram showing the structure of an embodiment of the measuring device of the present utility model;

[0016] Figure 2 for Figure 1 A three-dimensional diagram of a water receiving trough provided in the measuring device;

[0017] Figure 3 for Figure 2 A view of the water tank;

[0018] Figure 4 for Figure 2 A top view of the water receiving tank with the cover of the water receiving tank removed;

[0019] Figure 5 for Figure 3 A cross-sectional view of the water receiving trough along line BB;

[0020] Figure 6 for Figure 3 A cross-sectional view of the water receiving trough along line CC;

[0021] Figure 7 for Figure 1 A schematic diagram of the structure of a measuring unit included in a measuring device. DETAILED DESCRIPTION

[0022] ●Measurement device●

[0023] The following is a description of the embodiment of the measuring device of the utility model (hereinafter referred to as "this device"). In the following description, reference is made to the drawings as appropriate. In each of the drawings, the same reference numerals are given to the same parts and elements, and repeated descriptions are omitted. In addition, in each of the drawings, in order to clearly and concisely show each component, the shape and size of each component are intentionally changed relative to the actual size for illustration.

[0024] The "measuring device" is, for example, a device that calculates (measures) the concentration of a measurement target component (analysis target component) contained in a water sample by measuring the absorbance of each treated water sample. In this embodiment, the measuring device is, for example, a total nitrogen and total phosphorus concentration measuring device.

[0025] The "water sample" refers to water containing compounds (nitrogen compounds, phosphorus compounds) that are components to be measured by the measuring device, such as wastewater from factories and business premises.

[0026] It should be noted that, in the present invention, the water sample is not limited to drainage, that is, for example, the water sample may also be environmental water such as a river, a lake, a swamp, or an ocean.

[0027] The “measurement target component” is a component contained in a water sample that is a target of measurement by the present device, and in the present embodiment, is nitrogen and phosphorus.

[0028] It should be noted that in the present invention, the device can be a measuring device that measures only one of the total nitrogen concentration or the total phosphorus concentration, or a measuring device that measures the chemical oxygen demand (COD) in addition to the total nitrogen concentration and the total phosphorus concentration. In the latter case, the first measuring part (the second measuring part) is configured to be able to irradiate / receive light of a wavelength required for measuring the chemical oxygen demand. In addition, the device can be a measuring device that measures the concentration of heavy metals (e.g., hexavalent chromium) or a measuring device that only measures the chemical oxygen demand.

[0029] ●Structure of measuring device

[0030] Figure 1 It is a structural diagram showing an embodiment of the present device.

[0031] This device measures the water quality of water samples. The device 1 has: a water tank 2, a floating switch 3 (refer to Figure 5 ), cover 4, measuring section 5, measuring supply path Lb (refer to Figure 4 . The same below), return path Le.

[0032] The water receiving tank 2 is connected with a supply path La, a measurement supply path Lb, a first discharge path Lc, a second discharge path Ld, and a return path Le. The supply path La is a path for supplying the water sample collected by the water pump P0 to the water receiving tank 2. The measurement supply path Lb is a path for supplying the water sample received by the water receiving tank 2 to the measuring unit 5. The first discharge path Lc is a path for discharging the water sample excessively supplied to the water receiving tank 2 to a drain tank, etc. The second discharge path Ld is a path for discharging the water sample remaining in the water receiving tank 2 to a drain tank, etc. The return path Le is a path for returning the drainage from the measuring unit 5 to the water receiving tank 2. Here, the "drainage" flowing through the return path Le refers to water that can be discarded as general drainage, such as return water after pre-washing the piping in the measuring unit 5 with a water sample.

[0033] It should be noted that, in the present invention, the device may include all or part of the supply path, the first discharge path, the second discharge path, and the water intake pump.

[0034] Figure 2 It is a three-dimensional view of the water tank 2.

[0035] Figure 3 yes Figure 2 A view of the water receiving trough 2.

[0036] The water receiving tank 2 receives the water and supplies it to the measuring unit 5 (refer to Figure 1 The water receiving tank 2 comprises: a container portion 10, an inflow pipe portion 20, an outflow pipe portion 30, a first discharge pipe portion 40, a second discharge pipe portion 50, and a baffle 60. The container portion 10, the inflow pipe portion 20, the outflow pipe portion 30, the first discharge pipe portion 40, the second discharge pipe portion 50, and the baffle 60 are made of synthetic resin (for example, polypropylene <polypropylene: PP>). The container portion 10, the inflow pipe portion 20, the outflow pipe portion 30, the first discharge pipe portion 40, the second discharge pipe portion 50, and the baffle 60 are integrally formed by resin molding.

[0037] In the following description, the “upstream side” of a certain flow channel refers to the upstream side of the flow of liquid in the flow channel, and the “downstream side” of a certain flow channel refers to the downstream side of the flow of liquid in the flow channel.

[0038] Figure 4 It is a top view of the water receiving tank 2 with the cover 4 removed.

[0039] Figure 5 yes Figure 3 A cross-sectional view of the water receiving tank 2 along line BB.

[0040] In these figures, thick arrows indicate the flow of the water sample from the inlet 23 described later.

[0041] The container 10 temporarily stores the water sample supplied to the measuring unit 5. The container 10 includes a bottom 11 and a peripheral wall 12. The container 10 has a bottomed inverted truncated cone shape (approximately cylindrical shape).

[0042] When viewed in the up-down direction, the bottom 11 is in the shape of a circular plate. The outer peripheral edge of the bottom 11 extends upward in a roughly cylindrical shape to form a peripheral wall portion 12. The upper end 12a of the peripheral wall portion 12 is an open end that opens upward. The thickness of the peripheral wall portion 12 is the same from the lower end 12b to the upper end 12a. The inner diameter and the outer diameter of the peripheral wall portion 12 increase in diameter from the lower end 12b (bottom 11) to the upper end 12a (open end). That is, the peripheral wall portion 12 is in the shape of an inverted frustum of a cone (roughly cylindrical). Therefore, in the resin molding process of the water receiving tank 2, it becomes easy to remove the mold on the inner side of the molding container portion 10.

[0043] Figure 6 yes Figure 3 A cross-sectional view of the water receiving tank 2 along line CC.

[0044] In the following description, refer to Figure 4 and Figure 5 .

[0045] The inflow tube portion 20 is connected to the supply path La so that the water sample from the supply path La flows into the container portion 10. A portion of the lower end portion 12b of the peripheral wall portion 12 extends in a cylindrical shape in the tangential direction of the peripheral wall portion 12 when viewed in the up-down direction, forming the inflow tube portion 20. That is, the inflow tube portion 20 is arranged at the lower end portion 12b of the peripheral wall portion 12. The inflow tube portion 20 is cylindrical and parallel to the horizontal direction. An internal threaded surface 20a corresponding to a joint (not shown) connected to the supply path La is formed on the upstream end side of the inner circumferential surface of the inflow tube portion 20. The inflow tube portion 20 has an internal flow path 21, a connection port 22, and an inflow port 23.

[0046] The internal flow path 21 is defined by the inner circumferential surface of the inflow tube portion 20, and is a flow path for the water sample flowing into the container portion 10. When viewed in the up-down direction, the internal flow path 21 is formed along the tangential direction of the peripheral wall portion 12. Therefore, the water sample from the internal flow path 21 is supplied to the container portion 10 along the tangential direction. The inner diameter of the internal flow path 21 increases slightly as it moves from the downstream side (the inlet 23 side) to the upstream side (the connection port 22 side). Therefore, the internal flow path 21 can be formed using a mold, and the mold can be easily pulled out from the connection port 22 side after molding.

[0047] The connection port 22 is an opening on the upstream side of the inflow pipe portion 20 connected to the supply path La. The connection port 22 opens at the end surface of the inflow pipe portion 20 on the upstream side.

[0048] The inlet 23 is an opening on the downstream side of the inlet pipe portion 20. The inlet 23 is opened (arranged) at the lower portion of the inner peripheral surface 12c of the peripheral wall portion 12.

[0049] The outflow tube portion 30 is connected to the measurement supply path Lb, and the water sample stored in the container portion 10 is made to flow out to the measurement supply path Lb, thereby supplying the water sample to the measurement portion 5. A portion of the lower end portion 12b of the peripheral wall portion 12 is extended into a cylindrical shape in the tangential direction of the peripheral wall portion 12 when viewed in the up-down direction, forming the outflow tube portion 30. That is, the outflow tube portion 30 is arranged at the lower end portion 12b of the peripheral wall portion 12. The outflow tube portion 30 is cylindrical and parallel to the horizontal direction. On the downstream end side of the inner circumferential surface of the outflow tube portion 30, an internal threaded surface 30a corresponding to the joint connected to the measurement supply path Lb is formed. The outflow tube portion 30 has an internal flow path 31, a connection port 32, and an outflow port 33.

[0050] Here, when viewed in the up-down direction, the position of the outflow pipe portion 30 is set so that even if a vortex flow is generated due to the water sample that has passed the baffle 60, the outflow direction of the water sample toward the outflow pipe portion 30 will not be the same as the vortex direction of the vortex flow. Specifically, when viewed in the up-down direction, the position of the outflow pipe portion 30 is set so that the outflow pipe portion 30 overlaps (is parallel to) the inflow pipe portion 20 when the outflow pipe portion 30 is virtually rotated in the circumferential direction of the circumferential wall portion 12 along the tangent direction of the peripheral wall portion 12 and with the center point of the bottom 11 as the center. By setting it in this way, the outflow direction of the water sample toward the outflow pipe portion 30 becomes the opposite direction to the vortex direction of the vortex flow. In this embodiment, when viewed in the up-down direction, the outflow pipe portion 30 is arranged parallel to the inflow pipe portion 20 at the position farthest from the inflow pipe portion 20. That is, when viewed in the up-down direction, the outflow pipe portion 30 is arranged at a position that is point-symmetrical with the inflow pipe portion 20 with the center point of the bottom 11 as the center.

[0051] The internal flow path 31 is defined by the inner circumferential surface of the outflow tube portion 30, and is a flow path for the water sample stored in the container portion 10 to flow. When viewed in the up-down direction, the internal flow path 31 is formed along the tangent direction of the peripheral wall portion 12. When viewed in the up-down direction, the flow direction of the water sample flowing in the internal flow path 31 is the same as the flow direction of the water sample flowing in the internal flow path 21. The inner diameter of the internal flow path 31 increases slightly as it moves from the upstream side (the outlet 33 side) to the downstream side (the connection port 32 side). Therefore, the internal flow path 31 can be formed using a mold, which can be easily pulled out from the connection port 32 side after molding.

[0052] The connection port 32 is an opening on the downstream side of the outflow tube portion 30 that is connected to the measurement supply path Lb. The connection port 32 is open at the end surface of the outflow tube portion 30 on the downstream side.

[0053] The outflow port 33 is an upstream opening in the outflow pipe portion 30. The outflow port 33 is opened (arranged) at the lower portion of the inner peripheral surface 12c of the peripheral wall portion 12. The outflow port 33 is arranged slightly above the bottom portion 11 and at the same height as the inflow port 23 in the vertical direction.

[0054] The first discharge pipe section 40 is connected to the first discharge path Lc, and discharges the water sample supplied to the container section 10 (water receiving tank 2) (the water sample overflowing from the container section 10 to the first discharge pipe section 40) and the drainage from the measuring section 5 to the first discharge path Lc. When viewed in the up-down direction, a portion of the central portion in the up-down direction of the peripheral wall section 12 extends in a cylindrical shape in the tangential direction of the peripheral wall section 12, forming the first discharge pipe section 40. That is, in the up-down direction, the first discharge pipe section 40 is arranged at a position above the inflow pipe section 20 and the outflow pipe section 30 and at the central portion of the peripheral wall section 12. The first discharge pipe section 40 is cylindrical and parallel to the horizontal direction. When viewed in the up-down direction, the first discharge pipe section 40 is arranged side by side with the inflow pipe section 20 and is arranged at a position opposite to the outflow pipe section 30 across the container section 10. That is, when viewed in the up-down direction, the first discharge pipe section 40 is arranged at a position that is line-symmetrical with the outflow pipe section 30 with the diameter line of the bottom 11 as the center. An internal thread surface 40a corresponding to a joint (not shown) connected to the first discharge path Lc is formed on the downstream end side of the inner circumferential surface of the first discharge pipe section 40. The first discharge pipe section 40 includes: an internal flow path 41, a connection port 42, a first discharge port 43, and a connection hole 44. The first discharge pipe section 40 is an example of a discharge pipe section in the present invention.

[0055] The internal flow path 41 is defined by the inner circumferential surface of the first discharge pipe portion 40, and is a flow path for the water sample from the container portion 10 and the drainage from the measuring portion 5 to flow. When viewed in the up-down direction, the internal flow path 41 is formed along the tangent direction of the peripheral wall portion 12. When viewed in the up-down direction, the flow direction of the water sample and drainage flowing in the internal flow path 41 is opposite to the flow direction of the water sample flowing in the internal flow paths 21 and 31. The internal flow path 41 has a step portion 41a. The step portion 41a is in the form of a plane parallel to the up-down direction and perpendicular to the axial direction of the first discharge pipe portion 40. The step portion 41a is arranged in the upstream portion of the internal flow path 41. The bottom surface 41b of the bottom surface of the internal flow path 41, which is on the upstream side of the step portion 41a, is arranged at a position higher than the bottom surface 41c on the downstream side of the step portion 41a in order to narrow the internal flow path 41. When viewed in the axial direction of the first discharge pipe portion 40 ( Figure 1When viewed from the A direction of the inner wall 12, the bottom surface 41b is in the shape of a flat plate parallel to the horizontal direction, and the bottom surface 41c is in the shape of a curved semicircle. The inner diameter of the internal flow path 41 slightly increases as it moves from the upstream side (the first outlet 43 side) to the downstream side (the connection port 42 side). In addition, the step portion 41a is formed at the end of the peripheral wall portion 12. Therefore, the internal flow path 41 can be formed using a mold, which can be easily pulled out from the first outlet 43 side after molding.

[0056] The connection port 42 is an opening on the downstream side of the first discharge pipe section 40 connected to the first discharge path Lc. The connection port 42 opens at the downstream end surface of the first discharge pipe section 40. When viewed along the axial direction of the first discharge pipe section 40, the connection port 42 is circular.

[0057] The first discharge port 43 is an opening on the upstream side of the first discharge pipe portion 40. In the up-down direction, the first discharge port 43 is opened (arranged) at the central portion of the inner peripheral surface 12c of the peripheral wall portion 12. When viewed along the axial direction of the first discharge pipe portion 40, the first discharge port 43 is in an upper semicircular shape. The first discharge port 43 is one embodiment of the discharge port in the present invention.

[0058] It should be noted that in the present invention, the position of the first discharge port is not limited to the central part of the peripheral wall in the vertical direction as long as it is above the inlet and outlet and is a position where the float switch can stably detect the water sample. Therefore, the first discharge pipe portion can be arranged at a position corresponding to the position of the first discharge port.

[0059] The connection hole 44 is a through hole connected to the return path Le and vertically penetrates the bottom surface 41c of the first discharge pipe portion 40. That is, the connection hole 44 is arranged downstream of the first discharge port 43 and the step portion 41a.

[0060] By connecting the return path Le to the connecting hole 44, the drainage from the return path Le flows into the position of the internal flow path 41 that is downstream of the step portion 41a. As described above, since the bottom surface 41b on the upstream side of the step portion 41a is higher than the bottom surface 41c on the downstream side of the step portion 41a, the drainage is intercepted by the step portion 41a and does not flow into the container portion 10. That is, the drainage will not be mixed into the water sample. In the existing measuring device (hereinafter referred to as the "existing device"), in order to avoid the mixing of drainage and water samples, the drainage will be returned to the space arranged below the water receiving tank and discarded. In the water receiving tank 2 of the utility model, since the step portion 41a is formed on the first discharge pipe portion 40, the drainage path can be compactly integrated under the premise of avoiding the mixing of drainage into the water sample.

[0061] It should be noted that in the present invention, the position of the connection hole can be any position downstream of the step portion and is not limited to the bottom. That is, for example, the connection hole can also be arranged on the side surface or the upper surface of the internal flow path.

[0062] The second discharge pipe portion 50 discharges the water sample remaining in the container portion 10 to the second discharge path Ld. A portion of the bottom 11 of the container portion 10 near the outer peripheral edge extends downward in a cylindrical shape to form the second discharge pipe portion 50. The second discharge pipe portion 50 is in a cylindrical shape parallel to the up-down direction. The second discharge pipe portion 50 includes: an internal flow path 51, a connection port (not shown. The same below), and a second discharge port 53.

[0063] The internal flow path 51 is defined by the inner peripheral surface of the second discharge pipe part 50, and is a flow path for the water sample remaining in the container part 10 to flow. The connection port is an opening on the downstream side of the second discharge pipe part 50 connected to the second discharge path Ld. The connection port opens at the end surface on the downstream side of the second discharge pipe part 50. The second discharge port 53 is an opening on the upstream side of the second discharge pipe part 50. The second discharge port 53 opens at the bottom 11.

[0064] The baffle 60 changes the flow direction of the water sample flowing in from the inlet 23. A portion of the bottom 11 of the container portion 10 near the outer peripheral edge extends upward in a flat plate shape to form the baffle 60. The baffle 60 is connected to the bottom 11 and the peripheral wall portion 12. When viewed from the side, the baffle 60 is in a longitudinally long trapezoidal shape whose thickness decreases as it moves from the lower end 60a to the upper end 60b. When viewed in the up-down direction, the baffle 60 is in a flat plate shape along the up-down direction and the radial direction of the bottom 11. When viewed in the up-down direction, the baffle 60 is arranged on the diameter line D1 of the bottom 11 and along the radial direction of the bottom 11, and on the virtual line C1 passing through the axis of the inlet tube portion 20, it is arranged orthogonal to the virtual line C1. The baffle 60 is arranged opposite to the inlet 23 in the axial direction of the inlet tube portion 20.

[0065] The height of the baffle 60 is set to a height that does not allow the water sample flowing in from the inlet 23 to pass over the baffle 60 and form a swirling flow to the extent that it affects the float 304. That is, for example, the height of the baffle 60 is set according to factors that affect the flow rate of the water sample reaching the baffle 60 (for example, the inflow amount of the water sample from the inlet 23, the inner diameter of the peripheral wall portion 12, etc.). In the present embodiment, when viewed along the axial direction of the inlet pipe portion 20, the upper end 60b of the baffle 60 is located at a height higher than the lower half of the internal flow path 21 and lower than the upper end of the internal flow path 21. In the present embodiment, when viewed along the axial direction, the upper end 60b of the baffle 60 is located at the same height as about 60% of the height from the bottom surface of the internal flow path 21. In addition, when viewed along the axial direction, the end (inner edge 60c) of the baffle 60 in the radial direction of the bottom 11 is located closer to the center of the bottom 11 than the internal flow path 21. In other words, when viewed in the axial direction, the baffle 60 is arranged to overlap a region of the internal flow path 21 up to about 60% of the height from the bottom surface of the internal flow path 21. When viewed in the vertical direction, the end portion (inner edge portion 60c) faces the float 304 described later.

[0066] When viewed from above, the baffle 60 is arranged at a position rotated about 45 degrees counterclockwise from the inlet 23 with the center point of the bottom 11 as the center. Similarly, the second outlet 53 is arranged at a position rotated about 135 degrees counterclockwise from the inlet 23. The outflow port 33 is arranged at a position rotated about 180 degrees counterclockwise from the inflow port 23. The first outlet 43 is arranged at a position rotated about 270 degrees counterclockwise from the inflow port 23. That is, when viewed in the up-down direction, the outflow port 33 is arranged on a virtual extension line C2 of the same diameter line D2 of the bottom 11 relative to the inflow port 23. That is, when viewed in the up-down direction, the outflow port 33 is arranged at a position that is point-symmetrical with the inflow port 23 with the center point of the bottom 11 as the center.

[0067] The float switch 3 detects the presence or absence of the water sample in the container portion 10. The float switch 3 is a known float switch including a rod 301, two stoppers 302, 303, a float 304, and a reed switch (not shown, the same applies hereinafter).

[0068] The rod 301 is cylindrical and is mounted near the center of the bottom 11 (slightly on the outer edge side than the center) in such a manner as to penetrate the bottom 11 in the up-down direction when viewed from above. The stopper 302 is mounted on the rod 301 in such a manner as to contact the bottom 11 above the bottom 11. The stopper 303 is mounted on the upper end of the rod 301 and is arranged at a position lower than the bottom surface 41b of the internal flow path 41 in the up-down direction. The float 304 is cylindrical and is mounted on the rod 301 in such a manner as to be movable in the up-down direction between the stoppers 302 and 303. The reed switch is turned on / off by the magnet in the float 304. The reed switch is housed in the rod 301. The reed switch is turned on when the float 304 rises to a specified position and is turned off when the float 304 drops below the specified position. The signal from the reed switch is sent to the control unit 504 of the measuring unit 5 (refer to Figure 7 When the float 304 rises to a predetermined position in the vertical direction, the bottom surface 304 a of the float 304 is located above the baffle 60 .

[0069] It should be noted that in the present invention, the position of the bottom surface of the float when the float rises to the specified position is not limited to a position above the baffle. That is, for example, in the up-down direction, when the float rises to the specified position, the bottom surface of the float may also be located below the upper end of the baffle.

[0070] In addition, in the present invention, the rod 301 may also be disposed at the center of the bottom.

[0071] The cover 4 covers the upper end 12a (open end) of the container 10 to prevent foreign matter from entering the container 10. The cover 4 is made of, for example, the same synthetic resin as the container 10. The cover 4 is attached to the upper end 12a of the container 10.

[0072] Figure 7 3 is a schematic diagram of the structure of the measuring unit 5.

[0073] The measuring unit 5 measures the water quality of the water sample. The measuring unit 5 includes: a reaction tank 501, a heating tank 502, an absorbance meter 503, a control unit 504, a detection pipe L1, a water sample pipe L2 (measurement supply path Lb), a first reagent pipe L3, a second reagent pipe L4, a third reagent pipe L5, a total nitrogen pipe L6, a total phosphorus pipe L7, a pure water pipe L8, a drainage pipe L9 (return path Le), a pressurizing pipe L10, a total nitrogen discharge pipe L11, and a waste liquid pipe. L12, the first reagent tank T1, the second reagent tank T2, the third reagent tank T3, the fourth reagent tank T4, the fifth reagent tank T5, the pure water tank T6, the waste liquid tank T7, the detection pump P1, the water sample pump P2, the first reagent pump P3, the second reagent pump P4, the third reagent pump P5, the fourth reagent pump P6, the fifth reagent pump P7, the pure water pump P8, the drainage pump P9, the air pump P10, the waste liquid pump P11, the first to tenth valves V1 to V10. Since the structure and operation of the measuring unit 5 are the same as those of the known total nitrogen and total phosphorus concentration measuring devices, their detailed description is omitted.

[0074] The reaction tank 501 is a tank for mixing (reacting) each reagent with a water sample. The heating tank 502 heats the mixed solution mixed in the reaction tank 501. The absorbance meter 503 is a known absorbance meter having a flow cell, for example.

[0075] The control unit 504 controls the overall operation of the device 1. The control unit 504 is composed of, for example, a central processing unit (CPU), a random access memory (RAM) functioning as a work area of ​​the CPU, and a read only memory (ROM) storing various information such as programs.

[0076] In the following description, “upstream” and “downstream” of each pipe L1 to L10 are in principle along the direction of the fluid flowing in each pipe L1 to L12 when the fluid (water sample, reagent, air, atmosphere, etc.) is introduced into or discharged from the reaction tank 501 .

[0077] The upstream end and the downstream end of the detection pipe L1 are inserted into the reaction tank 501. The detection pipe L1 is connected to a detection pump P1 and an absorbance meter 503.

[0078] The water sample pipe L2 constitutes a measurement supply path Lb, and its upstream end is connected to the water receiving tank 2 (outlet 33: see Figure 5 ) is connected, and its downstream end is inserted into the reaction tank 501. A water sample pump P2 is connected to the water sample pipe L2.

[0079] The downstream end of the first reagent pipe L3 is inserted into the reaction tank 501, and the upstream end of the first reagent pipe L3 is connected to the pressurized pipe L10 via the first valve V1. The first reagent pump P3 is connected to the first reagent pipe L3, and is configured to supply the first reagent (for example, potassium peroxodisulfate solution) from the first reagent tank T1 to the first reagent pipe L3.

[0080] The downstream end of the second reagent piping L4 is inserted into the reaction tank 501, and the upstream end of the second reagent piping L3 is connected to the pressurized piping L10 via the second valve V2. The second reagent piping L4 is connected to the second reagent pump P4 and the third reagent pump P5, and is configured to supply the second reagent (e.g., hydrochloric acid) from the second reagent tank T2 or the third reagent (e.g., sodium hydroxide solution) from the third reagent tank T3 to the second reagent piping L4.

[0081] The downstream end of the third reagent piping L5 is inserted into the reaction tank 501, and the upstream end of the third reagent piping L5 is connected to the pressurized piping L10 via the second valve V2. The fourth reagent pump P6 and the fifth reagent pump P7 are connected to the third reagent piping L5, and are configured to supply the fourth reagent (e.g., ammonium molybdate solution) from the fourth reagent tank T4 or the fifth reagent (e.g., L-ascorbic acid solution) from the fifth reagent tank T5 to the third reagent piping L5.

[0082] One end of each of the pipe L6 for total nitrogen and the pipe L7 for total phosphorus is inserted into the reaction tank 501, and the other end of each of the pipe L6 for total nitrogen and the pipe L7 for total phosphorus is connected to the pressurized pipe L10 via the 10th valve V10. A portion of the other end side is located in the heating tank 502, constituting a heating section. The 3rd valve V3 is connected to the pipe L6 for total nitrogen at a position closer to one end side than the heating section, the 4th valve V4 is connected to a position closer to the other end side than the heating section, and the total nitrogen discharge pipe L11 is connected between the heating section and the 3rd valve V3. The 5th valve V5 is connected to the pipe L7 for total phosphorus at a position closer to one end side than the heating section, and the 6th valve V6 is connected to a position closer to the other end side than the heating section. The 7th valve V7 is connected to the total nitrogen discharge pipe L11.

[0083] The downstream end of the pure water pipe L8 is inserted into the reaction tank 501, and the upstream end of the pure water pipe L8 is inserted into the pure water tank T6. The 8th valve V8 and the 9th valve V9 are connected to the pure water pipe L8, and the pure water pump P8 is connected via the 8th valve V8. In addition, the pure water pipe L8 is connected to the pressurized pipe L10 via the 9th valve V9 and the 10th valve V10.

[0084] The drainage pipe L9 constitutes a return path Le, the upstream end of which is inserted into the reaction tank 501, and the downstream end of which is connected to the water receiving tank 2 (connection hole 44: see Figure 5 A drainage pump P9 is connected to the drainage pipe L9.

[0085] An air pump P10 and a tenth valve V10 are connected to the pressurizing pipe L10.

[0086] The upstream end of the waste liquid pipe L12 is inserted into the reaction tank 501, and the downstream end of the waste liquid pipe L12 is inserted into the waste liquid tank T7. The waste liquid pipe L12 is connected to a waste liquid pump P11, and is configured to discharge the waste liquid in the reaction tank 501 to the waste liquid tank T7.

[0087] ●Flow of water sample in the water tank

[0088] Next, the flow of the water sample in the water tank 2 will be described as follows. Figures 4 to 6 .

[0089] Before the measurement unit 5 starts measuring, the water sample is introduced into the water receiving tank 2. At this time, the water sample is collected by the water collection pump P0 and supplied to the inflow pipe part 20 through the supply path La.

[0090] The water sample supplied to the inflow tube portion 20 flows into the container portion 10 from the inflow port 23 in a manner along the axial direction of the inflow tube portion 20. Here, assuming that the baffle 60 is not arranged in the container portion 10, the water sample flowing into the container portion 10 will flow along the inner peripheral surface 12c of the peripheral wall portion 12, and the flow becomes a swirling flow that swirls in the counterclockwise direction when viewed from above. In this case, according to the supply amount (supply speed) of the water sample, the water surface of the water sample stored in the container portion 10 is recessed into an inverted cone shape. Therefore, the water level in the central part of the water surface drops, and the water level in the outer edge of the water surface rises. As described above, the float switch 3 is arranged near the central part of the bottom 11 when viewed from above. Therefore, when the water level in the central part drops due to the swirling flow, the float 304 can only rise to a position lower than the position indicating the correct amount of water (the position when the water surface is approximately horizontal), and the float switch 3 cannot detect the correct amount of liquid. As a result, until the float 304 rises to a predetermined position, excess water sample is supplied to the container portion 10, and the water level at the outer edge of the water surface exceeds the upper end portion (upper end portion 12a) of the container portion 10, and the water sample may overflow from the container portion 10. Thus, the occurrence of the swirling flow in the container portion 10 may become a major cause of malfunction of the float switch 3 and overflow of the water sample.

[0091] In view of this, in the utility model, the water sample flowing into the container portion 10 will collide with the baffle 60 immediately after flowing in. Therefore, the water sample cannot flow in the axial direction of the inflow tube portion 20, and its movement will also be hindered by the bottom 11 and the peripheral wall portion 12. In addition, the direction of the flow of the water sample will become the radial inner side and the upper side of the bottom 11. That is, the flow of the water sample is dispersed by the baffle 60. In addition, when the amount of water is small, the flow of the water sample that is directed to the radial inner side of the bottom 11 will collide with the float 304 and be further dispersed. Therefore, the flow of the water sample will not become a vortex flow, and the water sample will be stored in sequence from the bottom 11 of the container portion 10 to the upper side when the water surface is relatively stable. As a result, the float switch 3 will not malfunction and the water sample will not overflow from the container portion 10.

[0092] On the other hand, even if a tiny vortex flow is generated by the water sample passing over the baffle 60, the water level drop in the central part of the water surface will be very small. Moreover, when observed from above, the float switch 3 is not arranged in the central part of the bottom 11, but is arranged near the central part of the bottom 11. That is, the float switch 3 is arranged at a position slightly offset from the central part to the outer edge side. Therefore, the float 304 is not easily affected by the slight drop in the water surface, and the malfunction of the float switch 3 will not occur. In addition, as described above, when observed in the up and down direction, the outflow pipe part 3 is arranged at a position that is point-symmetrical with the inflow pipe part 20 with the center point of the bottom 11 as the center. Therefore, the outflow direction of the water sample toward the outflow pipe part 30 is roughly opposite to the vortex direction of the vortex flow. As a result, the water sample flowing in from the inflow pipe part 20 will not flow directly into the outflow pipe part 30.

[0093] Conclusion

[0094] According to the embodiment described above, the water receiving tank 2 includes: a circular bottom 11, an inverted truncated cone cylindrical peripheral wall portion 12, a cylindrical inflow pipe portion 20, and a plate-shaped baffle 60 along the up-down direction. The water receiving tank 2 is formed by resin molding. The peripheral wall portion 12 extends upward from the outer peripheral edge of the bottom 11, and together with the bottom 11, forms a bottomed inverted truncated cone cylindrical container portion 10. The inflow pipe portion 20 includes an inflow port 23 opened at the lower part of the inner peripheral surface 12c of the peripheral wall portion 12. The baffle 60 is arranged at the bottom 11 in a manner opposite to the inflow port 23. According to this structure, the water receiving tank 2 does not have a complex shape such as a double cylinder, and the container portion 10, the inflow pipe portion 20 and the baffle 60 can be formed into one piece by resin molding. Therefore, the water receiving tank 2 does not require complex processing in its manufacture. In addition, the flow direction of the water sample flowing from the inflow pipe portion 20 into the container portion 10 is dispersed and changed by the baffle 60. As a result, a swirling flow is not generated in the container portion 10 .

[0095] In addition, according to the embodiment described above, the inflow pipe portion 20 is configured to supply the water sample in the tangential direction of the peripheral wall portion 12 when viewed in the up-down direction. The baffle 60 is continuously configured with the bottom 11 and the peripheral wall portion 12 in a manner along the radial direction of the bottom 11. According to this structure, the water sample flowing into the container portion 10 flows out in a manner along the peripheral wall portion 12. That is, when viewed in the up-down direction, the water sample does not flow directly from the inlet 23 to the central portion of the container portion 10. Therefore, when viewed in the up-down direction, the central portion of the bottom 11 is not exposed to the direct flow of the water sample, and becomes a region suitable for arranging the float switch 3. In addition, the movement of the water sample colliding with the baffle 60 will also be hindered by the bottom 11 and the peripheral wall portion 12, and the direction of the flow of the water sample will become the inner side and the upper side in the radial direction of the bottom 11. That is, the flow of the water sample is dispersed by the baffle 60. Therefore, no swirling flow is generated in the container portion 10.

[0096] Moreover, according to the embodiment described above, the water receiving tank 2 is provided with a cylindrical outflow pipe portion 30 for the water sample flowing into the container portion 10 to flow out. When viewed in the up-down direction, the outflow pipe portion 30 is arranged on the peripheral wall portion 12 in a manner along the tangential direction of the peripheral wall portion 12 and in a manner that the outflow pipe portion 30 overlaps with the inflow pipe portion 20 when the outflow pipe portion 30 is virtually rotated in the circumferential direction of the peripheral wall portion 12. The outflow pipe portion 30 is provided with an outflow port 33 opened at the lower part of the inner peripheral surface 12c of the peripheral wall portion 12. According to this structure, the outflow pipe portion 30 can be integrally formed with the container portion 10, the inflow pipe portion 20 and the baffle 60 by resin molding. Therefore, the water receiving tank 2 does not require complicated processing in its manufacture. In addition, even if a swirling flow is generated in the container portion 10, the outflow direction of the water sample toward the outflow pipe portion 30 will be substantially opposite to the swirling direction of the swirling flow. As a result, the water sample flowing in from the inflow tube portion 20 does not directly flow into the outflow tube portion 30 .

[0097] Furthermore, according to the embodiment described above, the water receiving tank 2 includes a cylindrical outflow pipe portion 30 and a cylindrical first discharge pipe portion 40. The first discharge pipe portion 40 is arranged at a position above the inflow pipe portion 20 and the outflow pipe portion 30 in the up-down direction, and discharges the water sample flowing into the container portion 10. The first discharge pipe portion 40 includes: an internal flow path 41, a first discharge port 43, and a connection hole 44. The first discharge port 43 opens at the inner peripheral surface 12c of the peripheral wall portion 12. The internal flow path 41 is used to discharge the water sample discharged from the first discharge port 43. The return path Le for returning the drainage from the measuring portion 5 is connected to the connection hole 44. The connection hole 44 is arranged at a position on the downstream side of the internal flow path 41 than the first discharge port 43. The bottom surface 41b of the internal flow path 41 on the upstream side of the connection hole 44 is arranged at a position higher than the bottom surface 41c of other parts in order to reduce the internal flow path 41. According to this structure, the outflow pipe part 30 and the first discharge pipe part 40 can be integrally formed together with the container part 10, the inflow pipe part 20 and the baffle plate 60 by resin molding. Therefore, the water receiving tank 2 does not require complicated processing in its manufacture. In addition, the drainage is intercepted by the step part 41a at a position (step part 41a) on the downstream side of the bottom surface 41b, and does not flow into the container part 10.

[0098] Furthermore, according to the above-described embodiment, all of the water receiving tank 2 (container portion 10, inflow pipe portion 20, outflow pipe portion 30, first discharge pipe portion 40, second discharge pipe portion 50, baffle plate 60) are integrally formed by the resin molding process. Therefore, the water receiving tank 2 does not require complicated processing in its manufacture.

[0099] Other implementations

[0100] It should be noted that in the present invention, the container portion, the inflow pipe portion, the outflow pipe portion, the first discharge pipe portion, the second discharge pipe portion, and the baffle may not be formed as one piece. That is, for example, a part or all of the inflow pipe portion, the outflow pipe portion, the first discharge pipe portion, the second discharge pipe portion, and the baffle may be formed as a body with the container portion and mounted on the container portion by welding, adhesive, etc. In this case, the inflow pipe portion, the outflow pipe portion, the first discharge pipe portion, the second discharge pipe portion, and the baffle may each be formed by resin molding.

[0101] In addition, in the present invention, the position of the inflow pipe is not limited to the position of the present embodiment. That is, for example, the inflow pipe can also be arranged along the radial direction of the bottom. In this case, the baffle is arranged between the inflow port and the float switch in a manner opposite to the inflow port.

[0102] Furthermore, in the present invention, the positions of the outflow pipe section and the first discharge pipe section are not limited to the present embodiment. That is, for example, the outflow pipe section and the first discharge pipe section may be arranged along the radial direction of the bottom section.

[0103] Furthermore, in the present invention, the shape of the water receiving tank can be any shape as long as the entire water receiving tank (each structural element of the water receiving tank) can be formed by resin molding, and is not limited to the present embodiment.

[0104] Furthermore, in the present invention, the position and size of the baffle may be any position and size that can change the flow direction of the water sample flowing in from the inlet pipe portion and suppress the occurrence of the swirling flow, and are not limited to the present embodiment.

[0105] Furthermore, in the present invention, the shape of the baffle plate is not limited to the present embodiment as long as it can change the flow direction of the water sample flowing from the inlet pipe portion, suppress the occurrence of the swirling flow, and can be formed by resin molding. That is, for example, when viewed in the up and down direction, the baffle plate 60 can also be C-shaped, V-shaped, or L-shaped.

[0106] Description of Reference Numerals

[0107] 1: Measuring device

[0108] 2: Water sink

[0109] 10: Container

[0110] 11: Bottom

[0111] 12: Peripheral wall

[0112] 20: Inflow pipe

[0113] 23: Inflow

[0114] 30: Outflow pipe part

[0115] 33: Outflow

[0116] 40: First discharge pipe section (discharge pipe section)

[0117] 41: Internal flow path

[0118] 41b: Bottom surface

[0119] 41c: Bottom surface

[0120] 43: Exit 1

[0121] 44: Connection hole

[0122] 60: Baffle

[0123] 5: Measurement Department

[0124] La: Supply path

[0125] Le: Return path.

Claims

1. A measuring device for measuring the water quality of a water sample, characterized in that: have: a measuring unit that measures the water quality; and A water receiving tank, the water receiving tank is formed by resin molding, and receives the water sample supplied to the measuring part, The water receiving tank has: a bottom portion, the bottom portion being round; A peripheral wall portion, the peripheral wall portion extending upward from the outer peripheral edge of the bottom portion in a cylindrical shape, and together with the bottom portion defining a container portion opening upward; an inflow pipe portion, the inflow pipe portion being in a cylindrical shape and connected to a supply path for the water sample supplied to the container portion to flow, so that the water sample flows into the container portion; as well as a baffle that changes the direction of the flow of the water sample flowing from the inlet pipe portion, The inlet pipe portion includes an inlet port opened at a lower portion of the inner peripheral surface of the peripheral wall portion. The baffle has a plate shape extending in the up-down direction and is disposed at the bottom portion so as to face the inlet.

2. The measuring device according to claim 1, characterized in that The inflow pipe portion is configured to supply the water sample in a tangential direction of the peripheral wall portion when viewed in the up-down direction. The baffle is arranged along the radial direction of the bottom portion and in contact with the bottom portion and the peripheral wall portion.

3. The measuring device according to claim 2, characterized in that The water receiving tank is provided with an outflow pipe portion, the outflow pipe portion is cylindrical and is used for the water sample flowing into the container portion to flow out. When viewed in the up-down direction, the outflow pipe portion is arranged on the peripheral wall portion in a manner along the tangential direction and in a manner such that the outflow pipe portion overlaps with the inflow pipe portion when the outflow pipe portion is virtually rotated in the circumferential direction of the peripheral wall portion. The outflow pipe portion includes an outflow port opened at a lower portion of the inner peripheral surface of the peripheral wall portion.

4. The measuring device according to claim 1, characterized in that The water receiving tank has: an outflow tube portion, the outflow tube portion being cylindrical and allowing the water sample flowing into the container portion to flow out; and a discharge pipe portion, the discharge pipe portion being arranged at a position above the inflow pipe portion and the outflow pipe portion in the vertical direction, and being used to discharge the water sample flowing into the container portion, The discharge pipe portion comprises: a discharge port, the discharge port opening on the inner peripheral surface of the peripheral wall portion; an internal flow path through which the water sample discharged from the discharge port flows; and a connecting hole to which a return path for returning the drainage from the measuring part is connected, the connecting hole penetrating the discharge pipe part, The connection hole is arranged in the internal flow path at a position downstream of the discharge port in the flow direction of the water sample discharged from the container portion. The bottom surface of the internal flow path on the upstream side of the connection hole is arranged at a higher position than the bottom surface of other parts so as to narrow the internal flow path.

5. The measuring device according to any one of claims 1 to 4, characterized in that The water receiving trough is integrally formed by the resin molding process.

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