Measurement device and rotation detection method

Abstract

The present invention relates to a measurement device provided with a setting change mechanism that ensures waterproofness and dust prevention inside a housing and performs various setting changes such as zero adjustment, and a rotation detection method. A measurement device is provided with: a housing (3) having an accommodation space formed therein; a substrate (8) having a mounting surface (81) and housed in the housing space; magnetic sensors (91-94) mounted on the mounting surface (81); and a detection unit that is provided outside the housing (3) and detects the state quantity of the medium to be measured, in which a protruding part (33) that protrudes the inner peripheral surface of the housing space is formed in the housing (3), a recessed part (34) that is recessed from the outer peripheral surface of the housing toward the housing space is formed in the protruding part (33), and the substrate (8) is disposed such that the mounting surface (81) faces the protruding part (33).

Description

Technical Field

[0001] The present invention relates to a measuring device and a rotation detection method. Background Art

[0002] There is known a measuring device that measures the flow rate, pressure, temperature, pressure difference, etc. of a measurement medium typified by a fluid and outputs the measurement result to the outside. For such a measuring device, a setting change mechanism for making various settings such as zero adjustment is provided. For example, regarding the measuring device disclosed in Patent Document 1, a shaft (screw) and a rotary encoder are provided as the setting change mechanism. A hole communicating the inside and the outside is formed in the housing of the measuring device. The shaft is provided so as to penetrate the hole of the housing and can rotate inside the hole. The rotary encoder is mounted on a substrate provided inside the housing. Inside the housing, the shaft and the rotary encoder are connected and the shaft is rotated from the outside of the housing, whereby the rotary encoder can be rotated. Regarding the setting change mechanism, various setting changes are made based on the rotation direction and rotation speed of the shaft detected by the rotary encoder.

[0003] Patent Document 1: Japanese Unexamined Patent Application Publication No. 2016-001383 Summary of the Invention

[0004] Regarding the measuring device, in order to prevent failure of the instruments provided inside the housing, the housing is sometimes required to have waterproofness and dustproofness. However, regarding the current measuring device, a hole communicating the inside and the outside of the housing is formed in order to provide the setting change mechanism. A shaft is provided in the hole, and a gasket is used to seal between the shaft and the inner peripheral surface of the hole, whereby a certain degree of waterproofness and dustproofness can be ensured, but sometimes the waterproofness and dustproofness cannot be sufficiently ensured depending on the use environment of the measuring device.

[0005] An object of the present invention is to obtain a measuring device provided with a setting change mechanism that ensures waterproofness and dustproofness inside the housing and makes various setting changes such as zero adjustment.

[0006] The measuring device according to the present invention includes: a housing that forms a housing space inside; a substrate that has a mounting surface and is housed in the housing space; a magnetic sensor that is mounted on the mounting surface; and a detection unit that is provided outside the housing and detects a state quantity of the measurement medium. A protruding portion that makes the inner peripheral surface of the housing space protrude is formed in the housing, a concave portion that depresses from the outer peripheral surface of the housing toward the housing space is formed in the protruding portion, and the substrate is arranged such that the mounting surface faces the protruding portion.

[0007] Advantages of the Invention

[0008] According to the present invention, there is an effect that a measuring device provided with a setting change mechanism that ensures waterproofness and dustproofness inside the housing and makes various setting changes such as zero adjustment can be obtained. Description of the Drawings

[0009] Figure 1 It is a front view of the measuring device according to Embodiment 1.

[0010] Figure 2 It is a side view of the measuring device according to Embodiment 1.

[0011] Figure 3 It is a perspective view of the measuring device according to Embodiment 1.

[0012] Figure 4 It is a sectional view obtained by cutting the measuring device along the Figure 2 IV-IV line shown, and it is a partial enlarged sectional view in which part A is enlarged.

[0013] Figure 5 It is a partial enlarged exploded perspective view in which the concave portion of the measuring device according to Embodiment 1 is enlarged.

[0014] Figure 6 It is a view corresponding to a sectional view obtained by cutting along the Figure 4 VI-VI line shown, and it is a view for explaining the relationship between the rotation of the magnet and the magnetic sensor.

[0015] Figure 7 It is a view showing the relationship between the rotation angle of the magnet and the detection level of the magnetic sensor in Embodiment 1.

[0016] Figure 8 It is a view showing the functional structure related to various setting changes of the measuring device according to Embodiment 1.

[0017] Figure 9 It is a sectional view of the measuring device according to the comparative example, and it is a view corresponding to that of Figure 4 Embodiment 1. Detailed Description of the Invention

[0018] Next, the measuring device and the rotation detection method according to an embodiment of the present invention will be described in detail with reference to the drawings. In addition, the present invention is not limited to the embodiments described below.

[0019] [Embodiment 1]

[0020] Figure 1 It is a front view of the measuring device according to Embodiment 1. Figure 2 It is a side view of the measuring device according to Embodiment 1. Figure 3 It is a perspective view of the measuring device according to Embodiment 1. The measuring device 1 is a device for measuring a state quantity of a measured medium typified by a fluid. Examples of the state quantity of the measured medium include flow velocity, pressure, temperature, and pressure difference.

[0021] The measuring device 1 has a detection unit 2. The detection unit 2 is a part for detecting state quantities such as the flow rate, pressure, temperature, and pressure difference of the medium to be measured. For example, the detection unit 2 has a diaphragm (not shown) that deforms according to the pressure of the medium to be measured, and the measuring device 1 measures the pressure as a state quantity based on the deformation amount of the diaphragm.

[0022] The measuring device 1 has a housing 3. Figure 4 It is Figure 2 A cross-sectional view of the measuring device cut along the line IV-IV shown, and a partial enlarged cross-sectional view with part A enlarged. The inside of the housing 3 is a cavity, and this space is a housing space for housing a substrate and the like described later.

[0023] As Figure 4 shown, a protruding portion 33 that makes the inner peripheral surface 31 of the housing space protrude is formed on the housing 3. A concave portion 34 that depresses from the outer peripheral surface 32 of the housing 3 toward the housing space is formed on the protruding portion 33. The concave portion 34 depresses toward the housing space, but does not penetrate the housing 3 and does not connect the inside and outside of the housing 3.

[0024] Here, the direction in which the concave portion 34 extends is set as the first direction, and the X axis parallel to the first direction is defined. In Embodiment 1, the first direction is Figure 1 the left-right direction in the front view of Figure 2 and the depth direction in the side view of Figure 1 In addition, a second direction perpendicular to the first direction is defined, and the Z axis parallel to the second direction is defined. In Embodiment 1, the second direction is Figure 2 the up-down direction in the front view of Figure 1 and the side view of Figure 2 In addition, a third direction perpendicular to the first direction and the second direction is set as the third direction, and the Y axis parallel to the third direction is defined. In Embodiment 1, the third direction is

[0025] A window 36 for visually confirming the inside of the housing space is provided on the housing 3. A display unit 10 is provided at a position inside the housing space and visible from the window 36. The display unit 10 displays various setting information of the measuring device 1 and the detection results of the detection unit 2, and is, for example, an LCD (Liquid Crystal Display).

[0026] The measuring device 1 has a shaft 4. The shaft 4 is a rod-shaped member and is inserted into the concave portion 34. The shaft 4 can rotate around the central axis 35 of the concave portion 34.

[0027] Figure 5This is a partially enlarged exploded perspective view that magnifies the concave portion of the measuring device according to Embodiment 1. At one end 41 of the shaft 4 on the entrance 34a side of the concave portion 34 in the state of being inserted into the concave portion 34, an engaging portion 43 is formed. By engaging a tool with the engaging portion 43, the shaft 4 can be rotated. The engaging portion 43 is, for example, a groove, and by engaging a MINUS screwdriver, the shaft 4 can be rotated.

[0028] A washer 5 is mounted on the shaft 4, which abuts against the inner circumferential surface of the concave portion 34 and the outer circumferential surface of the shaft 4 in the state of being inserted into the concave portion 34 and supports the shaft 4 so that it can rotate. The washer 5 prevents water and dust from entering the inside of the concave portion 34.

[0029] The measuring device 1 has a magnet 6. The magnet 6 is a permanent magnet. The magnet 6 is mounted on the other end 42 side, which is opposite to the entrance 34a side of the concave portion 34, in the state of being inserted into the concave portion 34 of the shaft 4. The magnet 6 is mounted on the shaft 4 such that the N pole and the S pole are arranged in a direction perpendicular to the first direction (X axis). By rotating the shaft 4, the directions in which the N pole and the S pole of the magnet 6 face change. That is, by rotating the shaft 4, the magnetic field changes while the magnet 6 rotates.

[0030] The measuring device 1 has a cover portion 7. The cover portion 7 is mounted on the entrance 34a of the concave portion 34 to prevent the shaft 4 from falling out of the concave portion 34. The shape of the cover portion 7 is cylindrical. Even in the state where the cover portion 7 is mounted on the entrance 34a of the concave portion 34, the engaging portion 43 of the shaft 4 is exposed. Therefore, the shaft 4 can be rotated by engaging a tool with the engaging portion 43 in the state where the cover portion 7 is mounted.

[0031] As Figure 4 shown, the measuring device 1 has a substrate 8. The substrate 8 is provided in the accommodation space of the housing 3. The substrate 8 has a mounting surface 81. The substrate 8 is arranged such that the mounting surface 81 faces the outer circumferential surface 33a of the protruding portion 33.

[0032] The measuring device 1 has a plurality of magnetic sensors 91 to 94. In addition, in the following description, the magnetic sensors 91 to 94 are not distinguished and simply referred to as the magnetic sensor 9. The magnetic sensor 9 is mounted on the mounting surface 81 of the substrate 8.

[0033] For each of the magnetic sensors 9, a direction of the magnetic field that can be detected is set respectively. In addition, in the following description, the direction of the magnetic field that can be detected set for the magnetic sensor 9 is also simply referred to as the detection direction of the magnetic field.

[0034] A plurality of magnetic sensors 91 to 94 are arranged and mounted on the mounting surface 81. The direction in which the plurality of magnetic sensors 91 to 94 are arranged is parallel to the second direction (Z axis). The plurality of magnetic sensors 91 to 94 are mounted on the mounting surface 81 such that the detection directions of the magnetic fields are different.

[0035] When viewed along the third direction (Y-axis), two magnetic sensors 9 are symmetrically arranged on both sides across the central axis 35 of the recess 34. More specifically, on the paper surface of Figure 4 , the magnetic sensor 92 (first magnetic sensor) and the magnetic sensor 91 (second magnetic sensor) are arranged in sequence above the central axis 35 starting from a position close to the central axis 35. The magnetic sensor 94 (first magnetic sensor) and the magnetic sensor 93 (second magnetic sensor) are arranged in sequence below the central axis 35 starting from a position close to the central axis 35.

[0036] The magnetic sensors 92 and 94 are arranged such that the detection direction of the magnetic field is parallel to the first direction (X-axis). The magnetic sensors 91 and 93 are arranged such that the detection direction of the magnetic field is parallel to the second direction (Z-axis).

[0037] If the magnetic sensors 91 to 94 are arranged with respect to this magnetic field detection direction such that the magnet 6 rotates together with the shaft 4 and the magnetic field changes, the detection levels of the magnetic sensors 91 to 94 also change. The relationship between the change in the magnetic field and the detection levels of the magnetic sensors 91 to 94 will be described in detail later.

[0038] When viewed along the third direction (Y-axis), the position of the magnet 6 and the positions where the magnetic sensors 91 to 94 are arranged are offset along the first direction (X-axis). More specifically, compared with the positions where the magnetic sensors 91 to 94 are arranged, the position of the magnet 6 is shifted more toward the entrance 34a side of the recess 34. If the position of the magnet 6 is shifted more toward the entrance 34a side of the recess 34 compared with the positions where the magnetic sensors 91 to 94 are arranged, the depth of the recess 34 can be made shallower. If the depth of the recess 34 is shallower, the protruding amount of the protruding portion 33 protruding into the accommodation space decreases. Even for the same size of the housing 3, when the protruding amount of the protruding portion 33 is smaller, the accommodation space is enlarged. Therefore, the degree of freedom in arranging various components in the accommodation space of the housing 3 is improved. In addition, a wide accommodation space can be ensured and the housing 3 can be miniaturized, that is, the measuring device 1 can be miniaturized.

[0039] Figure 6 is a diagram corresponding to the sectional view taken along the Figure 4 shown VI-VI line, and is a diagram for explaining the relationship between the rotation of the magnet and the magnetic sensors. Figure 7 is a diagram showing the relationship between the rotation angle of the magnet and the detection levels of the magnetic sensors in the first embodiment.

[0040] As Figure 6 shown, the state where the N pole of the magnet 6 faces the mounting surface 81 side of the substrate 8 is set to 0°. In addition, the shaft 4 and the magnet 6 rotate counterclockwise so that the rotation angle increases.

[0041] The magnetic sensors 91 to 94 set the intensity of the detected magnetic field as a threshold value, output a detection level of high level (H) when detecting a magnetic field stronger than the threshold value, and output a detection level of low level (L) when detecting a magnetic field weaker than the threshold value.

[0042] The detection levels of the magnetic sensors 91 to 94 change according to the rotation angle of the magnet 6. In Figure 7 the horizontal axis represents the rotation angle of the magnet 6, and the vertical axis represents the detection levels of the respective magnetic sensors 91 to 94. In addition, in the following description, the detection levels of the magnetic sensors 91 to 94 are represented by (the detection level of the magnetic sensor 91, the detection level of the magnetic sensor 92, the detection level of the magnetic sensor 93, the detection level of the magnetic sensor 94).

[0043] In the range where the rotation angle of the magnet 6 is 0° to 15°, the detection levels of the magnetic sensors 91 to 94 are a (L, L, L, H). In the range where the rotation angle of the magnet 6 is 15° to 80°, the detection levels of the magnetic sensors 91 to 94 are b (L, L, L, L). In the range where the rotation angle of the magnet 6 is 80° to 115°, the detection levels of the magnetic sensors 91 to 94 are c (H, L, L, L). In the range where the rotation angle of the magnet 6 is 115° to 180°, the detection levels of the magnetic sensors 91 to 94 are d (H, L, H, L). In the range where the rotation angle of the magnet 6 is 180° to 225°, the detection levels of the magnetic sensors 91 to 94 are e (H, H, H, L). In the range where the rotation angle of the magnet 6 is 225° to 270°, the detection levels of the magnetic sensors 91 to 94 are f (H, H, H, H). In the range where the rotation angle of the magnet 6 is 270° to 315°, the detection levels of the magnetic sensors 91 to 94 are g (L, H, H, H). In the range where the rotation angle of the magnet 6 is 315° to 350°, the detection levels of the magnetic sensors 91 to 94 are h (L, H, L, H). Moreover, after the rotation angle of the magnet exceeds 350°, the detection levels of a to h are repeated again.

[0044] Therefore, it can be known that for example when the detection level changes from a to b, the magnet 6 and the shaft 4 rotate counterclockwise. In addition, it can be known that when the detection level changes from a to h without passing through g from b, the magnet 6 and the shaft 4 rotate clockwise. In addition, the rotation speed of the magnet 6 and the shaft 4 can be known from the cycle of the change in the detection level.

[0045] Regarding the measuring device 1, various setting changes such as zero adjustment are performed based on the rotation direction and rotation speed of the shaft 4. Figure 8 is a diagram showing the functional structure related to various setting changes of the measuring device according to Embodiment 1. The measuring device 1 has a storage unit 11 and a control unit 12.

[0046] The storage unit 11 stores data and programs required for various processes of the control unit 12. The storage unit 11 is a semiconductor memory element such as RAM (Random Access Memory), ROM (Read Only Memory), or flash memory, or a storage device such as a hard disk or optical disk.

[0047] The control unit 12 includes a determination unit 12a and a display control unit 12b. The determination unit 12a receives the detection levels sent from the magnetic sensors 91 to 94 and determines the rotational direction and speed of the shaft 4 based on changes in the detection levels. Furthermore, based on the determined rotational direction and speed, the determination unit 12a changes settings and instructs the display control unit 12b to change the display.

[0048] The display control unit 12b changes the display on the display unit 10 based on the instruction from the determination unit 12a. For example, the measurement device 1 measures the pressure of a medium to be measured. When various settings are changed to change the unit of pressure, the unit displayed on the display unit 10 is changed.

[0049] The control unit 12 is, for example, an electronic circuit. Examples of the electronic circuit include an integrated circuit such as an ASIC (Application Specific Integrated Circuit) or an FPGA (Field Programmable Gate Array), or a CPU (Central Processing Unit) or an MPU (Micro Processing Unit).

[0050] [Comparative Example]

[0051] Figure 9 This is a cross-sectional view of a measuring device according to a comparative example, and is equivalent to that of embodiment 1. Figure 4 . Regarding the measuring device 101 involved in the comparative example, a through hole 134 that connects the inside and the outside is formed in the housing 103. Regarding the measuring device 101 involved in the comparative example, the shaft 104 is provided so as to pass through the through hole 134. Regarding the measuring device 101 involved in the comparative example, a rotary encoder 106 is mounted on a substrate 108 provided in a storage space of the housing 103. The end of the shaft 104 is connected to the rotary encoder 106 via a pin 107. The pin 107 also functions as a stopper for the shaft 104. Regarding the measuring device 101 involved in the comparative example, the rotary encoder 106 rotates in conjunction with the shaft 104. Regarding the measuring device 101 involved in the comparative example, a washer 105 is provided that contacts the outer peripheral surface of the shaft 104 and the inner peripheral surface of the through hole 134. Regarding the measuring device 101 involved in the comparative example, the rotation of the shaft 104 is detected by the rotary encoder 106 and various setting changes such as zero point adjustment are performed.

[0052] As described above, regarding the measuring device 101 involved in the comparative example, a through-hole 134 is formed in the housing 103, so that water and dust can penetrate into the interior of the housing. A gasket 105 is provided, so that a certain degree of waterproofness and dustproofness can be ensured. However, sometimes, depending on the usage environment of the measuring device 101, sufficient waterproofness and dustproofness cannot be ensured.

[0053] [Summary of effects]

[0054] The measuring device 1 described above includes: a housing 3 in which a receiving space is formed inside; a substrate 8 having a mounting surface 81 and received in the receiving space; a magnetic sensor 9 mounted on the mounting surface 81; and a detection unit 2 provided outside the housing 3 and detecting a state quantity of a measured medium. A protruding portion 33 that protrudes the inner peripheral surface of the receiving space is formed in the housing 3. A concave portion 34 that depresses from the outer peripheral surface of the housing 3 toward the receiving space is formed in the protruding portion 33. The substrate 8 is arranged such that the mounting surface 81 faces the protruding portion 33.

[0055] The concave portion 34 formed in the housing 3 and into which the shaft 4 can be inserted is a concave portion that does not penetrate the housing 3. Therefore, unlike the measuring device 101 involved in the comparative example, water and dust do not penetrate into the receiving space of the housing 3 through the concave portion 34. Therefore, the waterproofness and dustproofness of the measuring device 1 can be ensured more reliably. In addition, a magnetic sensor is provided on the mounting surface 81 of the substrate 8 disposed opposite to the protruding portion 33, so that a change in the magnetic field when the magnet 6 rotates in the concave portion 34 can be detected.

[0056] Regarding the measuring device 101 involved in the comparative example, the through-hole 134 formed in the housing 103 to allow the shaft 104 to penetrate communicates the inside and outside of the housing 103, so it is likely to become a weakness in terms of ensuring pressure resistance and explosion protection. On the other hand, regarding the measuring device 1 according to the first embodiment, a hole that communicates the inside and outside to allow the shaft 4 to penetrate is not formed, so pressure resistance and explosion protection can be ensured more reliably.

[0057] In addition, a plurality of magnetic sensors 91 to 94 are mounted on the mounting surface 81. When the direction in which the concave portion 34 extends is set as the first direction, the plurality of magnetic sensors 91 to 94 are arranged in a second direction perpendicular to the first direction. The plurality of magnetic sensors 91 to 94 are arranged in the second direction, so that the rotation angle and rotation speed can be determined based on the change in the detection level of each of the magnetic sensors 91 to 94 when the magnet 6 in the concave portion 34 rotates.

[0058] In addition, the plurality of magnetic sensors 91 to 93 include: two first magnetic sensors 92 and 94 whose magnetic field detection directions are parallel to the first direction; and two second magnetic sensors 91 and 93 whose magnetic field detection directions are parallel to the second direction. When observed in a third direction perpendicular to the first direction and the second direction, the first magnetic sensors 92 and 94 are symmetrically arranged with the central axis 35 of the concave portion 34 as the center, and the second magnetic sensors 91 and 93 are symmetrically arranged with the central axis 35 as the center. With such an arrangement of the plurality of magnetic sensors 91 to 93, the rotation angle and rotation speed can be determined based on the changes in the detection levels of each of the magnetic sensors 91 to 94 when the magnet 6 in the concave portion 34 rotates. In addition, by changing the number and arrangement of the magnetic sensors 9, high resolution can also be achieved.

[0059] In addition, the measuring device 1 further includes: a shaft 4 inserted into the concave portion 34 and arranged to be rotatable about the central axis 35 of the concave portion 34; and a magnet 6 having an N pole and an S pole arranged in a direction perpendicular to the first direction and mounted on the shaft 4.

[0060] The shaft 4 inserted into the concave portion 34 is arranged not to penetrate the housing 3, so that the waterproofness, dustproofness, pressure resistance and explosion protection of the housing 3 can be more reliably ensured. Since the magnet 6 rotates together with the shaft 4, the magnetic field inside the housing 3 changes. By detecting the change in this magnetic field using the magnetic sensor 9, the rotation direction and rotation speed of the shaft 4 can be detected. Therefore, the rotation direction and rotation speed of the shaft 4 can be detected without forming a through hole in the housing 3. Various setting changes of the measuring device 1 can be made based on the detected rotation direction and rotation speed of the shaft 4.

[0061] Unlike the measuring device 101 in the comparative example, the operation of passing the pin 107 through the shaft 104 and the rotary encoder 106 inside the housing 103 to prevent the shaft 104 from falling off is not performed. The shaft 4 can be arranged only by being inserted into the concave portion 34, so that the assembly operation of the measuring device 1 is facilitated. In addition, regarding the measuring device 101 in the comparative example, the shaft 104 and the rotary encoder 106 are connected via a pin, so there is backlash when the shaft 104 rotates. On the other hand, regarding the measuring device 1 according to the first embodiment, no rotary encoder is provided, and there is no connection structure with the mechanism for detecting the rotation of the shaft 4, so a seamless operation feeling can be obtained without backlash.

[0062] Since it is not necessary to connect the shaft 104 and the rotary encoder 106 inside the housing 103 using a pin 107 as in the measuring device 101 in the comparative example, the shaft 4 of the measuring device 1 according to the first embodiment can be easily replaced and retrofitted.

[0063] In addition, when observed in the third direction, a magnet 6 is provided at a position shifted more toward the entrance 34a of the concave portion 34 in the first direction compared to the magnetic sensors 91 to 94. If the position of the magnet 6 is shifted more toward the entrance 34a of the concave portion 34 than the positions where the magnetic sensors 91 to 94 are arranged, the depth of the concave portion 34 can be made shallower. If the depth of the concave portion 34 is shallower, the protruding amount of the protruding portion 33 protruding into the accommodation space decreases. Even for the same size of the housing 3, when the protruding amount of the protruding portion 33 is smaller, the accommodation space expands. Therefore, the degree of freedom in arranging various components in the accommodation space of the housing 3 is improved. In addition, a wide accommodation space can be ensured and the housing 3 can be miniaturized, that is, the measuring device 1 can be miniaturized.

[0064] In addition, there is also a determination unit 12a that determines the rotation direction of the shaft 4 based on the detection results of the magnetic sensors 91 to 94. Since the measuring device 1 has the determination unit 12a, the measuring device 1 can determine the rotation direction and rotation speed of the shaft 4 and perform various setting changes.

[0065] In addition, the measuring device 1 further includes a washer 5 that abuts against the inner peripheral surface of the concave portion 34 and the outer peripheral surface of the shaft 4 and supports the shaft 4 so as to be rotatable about the central axis 35. The washer 5 prevents water and dust from entering the concave portion 34.

[0066] In addition, the measuring device 1 further includes a cover portion 7 fitted into the entrance 34a of the concave portion 34. A fitting portion 43 that can be engaged with a tool for rotating the shaft 4 is formed at an end portion of the shaft 4 on the entrance 34a side of the concave portion 34, and the cover portion 7 is formed in a cylindrical shape so that the fitting portion 43 is exposed. Since the cover portion 7 is fitted into the entrance 34a of the concave portion 34 and the fitting portion 43 is exposed, the shaft 4 can be rotated by using the cover portion 7 to prevent the shaft 4 from falling off and inserting a tool inside the cover portion 7.

[0067] In addition, a window 36 through which the inside of the accommodation space can be visually confirmed is formed in the housing 3, and the measuring device 1 further includes a display portion 10 provided inside the accommodation space and visible through the window 36. The display portion 10 can display the measurement results of the measuring device 1 and the like.

[0068] In addition, the measuring device 1 further includes a display control unit 12b that changes the display of the display portion 10 based on the detection results of the magnetic sensor 9. For example, if various setting values of the measuring device 1 are displayed on the display portion 10, the shaft 4 can be rotated while confirming the setting values to perform various setting changes.

[0069] In addition, the method for detecting the rotation of the shaft 4 of the measuring device 1 includes the following steps: receiving the detection levels of the plurality of magnetic sensors 91 to 94; and determining the rotation direction of the shaft 4 based on the changes in the detection levels of the plurality of magnetic sensors 91 to 94. Since the rotation direction and rotation speed can be detected based on the change in the magnetic field accompanying the rotation of the shaft 4, there is no need to form a hole in the housing 3 that communicates the inside and the outside, and various effects as described above can be obtained.

[0070] [Other]

[0071] Several examples of combinations of the disclosed technical features are described below.

[0072] (1) A measuring device, wherein the measuring device has: a housing that forms a receiving space inside; a substrate that has a mounting surface and is received in the receiving space; a magnetic sensor that is mounted on the mounting surface; and a detection unit that is provided outside the housing and detects a state quantity of a medium to be measured. A protruding portion that makes the inner peripheral surface of the receiving space protrude is formed in the housing, and a concave portion that depresses from the outer peripheral surface of the housing toward the receiving space is formed in the protruding portion. The substrate is arranged such that the mounting surface faces the protruding portion.

[0073] (2) The measuring device according to (1) above, wherein a plurality of the magnetic sensors are mounted on the mounting surface. When the direction in which the concave portion extends is set as the first direction, the plurality of magnetic sensors are arranged and configured in a second direction perpendicular to the first direction.

[0074] (3) The measuring device according to (2) above, wherein the plurality of magnetic sensors include: two first magnetic sensors whose magnetic field detection directions are parallel to the first direction; and two second magnetic sensors whose magnetic field detection directions are parallel to the second direction. When observing in a third direction perpendicular to the first direction and the second direction, the first magnetic sensors are symmetrically arranged with the central axis of the concave portion as the center, and the second magnetic sensors are symmetrically arranged with the central axis as the center.

[0075] (4) The measuring device according to any one of (1) to (3) above, wherein the measuring device further has: a shaft that is inserted into the concave portion and is arranged to be rotatable about the central axis of the concave portion; and a magnet that has an N pole and an S pole arranged in a direction perpendicular to the first direction and is mounted on the shaft.

[0076] (5) The measuring device according to (4) above, wherein, when observed in a third direction perpendicular to the first direction and the second direction, the magnet is provided at a position offset more toward the entrance side of the concave portion than the magnetic sensor in the first direction.

[0077] (6) The measuring device according to (4) or (5) above, wherein the measuring device further has a discrimination unit that discriminates the rotation direction of the shaft based on the detection result of the magnetic sensor.

[0078] (7) The measuring device according to any one of (4) to (6) above, wherein the measuring device further has a washer that abuts against the inner peripheral surface of the concave portion and the outer peripheral surface of the shaft and supports the shaft to be rotatable about the central axis.

[0079] (8) The measuring device according to any one of (4) to (7) above, wherein the measuring device further has a lid portion that is fitted into the entrance of the concave portion, and a fitting portion that can be engaged with a tool for rotating the shaft is formed at an end portion of the shaft on the entrance side of the concave portion, and the lid portion is formed in a cylindrical shape that exposes the fitting portion.

[0080] (9) The measuring device according to any one of (1) to (8) above, wherein a window through which the inside of the accommodation space can be visually confirmed is formed in the housing, and the measuring device further has a display portion that is provided inside the accommodation space and can be visually confirmed through the window.

[0081] (10) The measuring device according to (9) above, wherein the measuring device further has a display control unit that changes the display of the display portion based on the detection result of the magnetic sensor.

[0082] (11) A rotation detection method, which is a rotation detection method for detecting the rotation direction of the shaft of a measuring device. The measuring device has: a housing, which forms a receiving space inside, forms a protruding portion that makes the inner peripheral surface of the receiving space protrude, and has a concave portion formed on the protruding portion and recessed from the outside toward the receiving space; a substrate, which has a mounting surface opposite to the protruding portion and is received in the receiving space; a plurality of magnetic sensors, which are mounted on the mounting surface; a detection unit, which is provided outside the housing and detects the state quantity of the medium to be measured; and the shaft, which is inserted into the concave portion and is arranged to be rotatable about the central axis of the concave portion. Wherein, when the direction in which the concave portion extends is set as the first direction, the plurality of magnetic sensors are arranged and configured along a second direction perpendicular to the first direction. The plurality of magnetic sensors include: two first magnetic sensors whose magnetic field detection direction is parallel to the first direction; and two second magnetic sensors whose magnetic field detection direction is parallel to the second direction. When observing along a third direction perpendicular to the first direction and the second direction, the first magnetic sensors are symmetrically arranged with respect to the central axis of the concave portion, and the second magnetic sensors are symmetrically arranged with respect to the central axis. The rotation detection method includes the following steps: receiving the detection levels of the plurality of magnetic sensors; and determining the rotation direction of the shaft based on the changes in the detection levels of the plurality of magnetic sensors.

[0083] Explanation of reference numerals

[0084] 1 Measuring device

[0085] 2 Detection unit

[0086] 3 Housing

[0087] 31 Inner peripheral surface

[0088] 32 Outer peripheral surface

[0089] 33 Protruding portion

[0090] 33a Outer peripheral surface

[0091] 34 Concave portion

[0092] 34a Entrance

[0093] 35 Central axis

[0094] 36 Window

[0095] 4 Shaft

[0096] 41 One end

[0097] 42 The other end

[0098] 43 Engaging portion

[0099] 5 Washer

[0100] 6 Magnet

[0101] 7 Cover part

[0102] 8 Substrate

[0103] 81 Mounting surface

[0104] 9, 91, 92, 93, 94 Magnetic sensor

[0105] 10 Display unit

[0106] 11 Storage unit

[0107] 12 Control unit

[0108] 12a Discrimination unit

[0109] 12b Display control unit

Claims

1. A measuring device, wherein, the measuring device has: a housing that forms a receiving space inside; a substrate that has a mounting surface and is received in the receiving space; a magnetic sensor mounted on the mounting surface; and a detection unit that is provided outside the housing and detects a state quantity of a medium to be measured, a protruding portion that makes the inner peripheral surface of the receiving space protrude is formed on the housing, a concave portion that depresses from the outer peripheral surface of the housing toward the receiving space is formed in the protruding portion, the substrate is arranged such that the mounting surface faces the protruding portion.

2. The measuring device according to claim 1, wherein, a plurality of the magnetic sensors are mounted on the mounting surface, when the direction in which the concave portion extends is set as the first direction, the plurality of magnetic sensors are arranged and configured along a second direction perpendicular to the first direction.

3. The measuring device according to claim 2, wherein, the plurality of magnetic sensors include: two first magnetic sensors whose magnetic field detection directions are parallel to the first direction; and two second magnetic sensors whose magnetic field detection directions are parallel to the second direction, when viewed in a third direction perpendicular to the first direction and the second direction, the first magnetic sensors are symmetrically arranged with the central axis of the concave portion as the center, and the second magnetic sensors are symmetrically arranged with the central axis as the center.

4. The measuring device according to claim 1, wherein, the measuring device further has: a shaft that is inserted into the concave portion and is arranged to be rotatable about the central axis of the concave portion; and a magnet that has an N pole and an S pole arranged in a direction perpendicular to the first direction and is mounted on the shaft when the direction in which the concave portion extends is set as the first direction.

5. The measuring device according to claim 4, wherein, when viewed in a third direction perpendicular to the first direction and the second direction, the magnet is provided at a position offset more toward the entrance side of the concave portion in the first direction compared with the magnetic sensor.

6. The measuring device according to claim 4, wherein, the measuring device further has a discrimination unit that discriminates the rotation direction of the shaft based on the detection result of the magnetic sensor.

7. The measuring device according to claim 4, wherein, the measuring device further has a washer that abuts against the inner peripheral surface of the concave portion and the outer peripheral surface of the shaft, and supports the shaft to be rotatable about the central axis.

8. The measuring device according to claim 4, wherein, the measuring device further has a cover portion that is fitted into the entrance of the concave portion, a engaging portion that can engage with a tool for rotating the shaft is formed at an end of the shaft on the entrance side of the concave portion, the cover portion is formed in a cylindrical shape that exposes the engaging portion.

9. The measuring device according to claim 1, wherein, a window through which the inside of the receiving space can be visually confirmed is formed on the housing, the measuring device further has a display unit that is provided inside the receiving space and can be visually confirmed through the window.

10. The measuring device according to claim 9, wherein, the measuring device further includes a display control unit that changes the display of the display unit based on the detection result of the magnetic sensor.

11. A rotation detection method for detecting the rotation direction of the axis of a measuring device, the measuring device comprising: a housing that forms a receiving space inside, has a protruding portion that makes the inner peripheral surface of the receiving space protrude, and has a concave portion formed in the protruding portion and recessed from the outside toward the receiving space; a substrate that has a mounting surface facing the protruding portion and is received in the receiving space; a plurality of magnetic sensors mounted on the mounting surface; a detection unit that is provided outside the housing and detects a state quantity of a medium to be measured; and the axis that is inserted into the concave portion and is arranged to be rotatable about the central axis of the concave portion, wherein, when the direction in which the concave portion extends is set as the first direction, the plurality of magnetic sensors are arranged in a second direction perpendicular to the first direction, the plurality of magnetic sensors include: two first magnetic sensors whose magnetic field detection directions are parallel to the first direction; and two second magnetic sensors whose magnetic field detection directions are parallel to the second direction, when observing in a third direction perpendicular to the first direction and the second direction, the first magnetic sensors are symmetrically arranged with respect to the central axis of the concave portion, and the second magnetic sensors are symmetrically arranged with respect to the central axis, the rotation detection method includes the following steps: receiving the detection levels of the plurality of magnetic sensors; and determining the rotation direction of the axis based on the changes in the detection levels of the plurality of magnetic sensors.

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