Physical quantity measuring device

Abstract

A physical quantity measuring device (1) is provided with: a sensor module (5) including a detecting unit (54) for detecting a physical quantity of a fluid being measured; a circuit board including a first board (41) and a second board (42) which are electrically connected to the sensor module (5) and which are arranged facing one another; a first case (2) accommodating the sensor module (5) and the first board (41); and a second case (3) which is attached to the first case (2) and which accommodates the second board (42). A plurality of first notched portions are formed in the first board (41), a plurality of second notched portions are formed in the second board (42), a plurality of first supporting portions (211) which are inserted through the first notched portions and which support the second board (42) are formed integrally with the first case (21), and a plurality of second supporting portions (311) which are inserted through the second notched portions and which support the first board (41) are formed integrally with the second case (3).

Description

[Technical field]

[0001] The present invention relates to a physical quantity measuring device. [Background technology]

[0002] 2. Description of the Related Art Conventionally, physical quantity measuring devices having a structure in which a circuit board is supported by a cylindrical case are known (for example, see Patent Document 1, etc.). In Patent Document 1, the first circuit board is engaged with a stepped portion formed in the cylindrical case, and the first circuit board is sandwiched between the pressing portion of the lid and the stepped portion of the cylindrical case, thereby making it possible to hold the first circuit board securely. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2017-211260 A Summary of the Invention [Problem to be solved by the invention]

[0004] In Patent Document 1, the second circuit board is supported by the first circuit board through the joining pins and connectors arranged between the first circuit board and the second circuit board. That is, the second circuit board is not directly supported by the cylindrical case, but is supported through the electronic components of the first circuit board, the joining pins, and the connector. In this case, since the electronic components such as the first circuit board, the joining pins, and the connector are not usually components that support members, there is a possibility that the support of the second circuit board may be insufficient. However, if a new component is provided to support the second circuit board, the number of components increases, and the manufacturing process becomes complicated. Therefore, a structure that can reliably support multiple circuit boards without increasing the number of components has been desired.

[0005] An object of the present invention is to provide a physical quantity measuring device that can reliably support a plurality of circuit boards without increasing the number of parts. [Means for solving the problem]

[0006] The physical quantity measuring device of the present invention includes a sensor module having a detection unit that detects a physical quantity of a fluid to be measured, a circuit board that is electrically connected to the sensor module and has a first board and a second board that are arranged opposite each other, a first case that houses the sensor module and the first board, and a second case that is attached to the first case and houses the second board, wherein a plurality of first notches are formed in the first board, a plurality of second notches are formed in the second board, a plurality of first support parts that are inserted into the first notches and support the second board are formed integrally in the first case, and a plurality of second support parts that are inserted into the second notches and support the first board are formed integrally in the second case. The first substrate is provided with an external terminal portion, and the first case is formed with an opening at a position corresponding to the external terminal portion. It is characterized by:

[0007] In the present invention, a plurality of first notches are formed in the first substrate, and a plurality of second notches are formed in the second substrate. The first substrate is supported by the second substrate provided in the second substrate, with the first support provided in the first substrate inserted into the first notch. That is, the first substrate is positioned by the first support and supported by the second support. Similarly, the second substrate is supported by the first support provided in the second substrate, with the second support provided in the second substrate inserted into the second notch. That is, the second substrate is positioned by the second support and supported by the first support. In this way, the first substrate and the second substrate constituting the circuit substrate are positioned and supported by the first support and the second support formed integrally with the first substrate and the second substrate. Therefore, the first substrate and the second substrate can be reliably supported without increasing the number of components.

[0008] The physical quantity measuring device of the present invention comprises a sensor module having a detection unit that detects a physical quantity of a measured fluid, a circuit board having a first board and a second board electrically connected to the sensor module and arranged opposite each other, a first case that houses the sensor module and the first board, a second case attached to the first case and housing the second board, a display unit provided in the second case, and a support member housed in the second case and having a display holder that holds the display unit, wherein a plurality of first notches are formed in the first board, a plurality of second notches are formed in the second board, the first case is integrally formed with a plurality of first support parts that are inserted into the first notches and support the second board, and the support member is integrally formed with a plurality of second support parts that are inserted into the second notches and support the first board.

[0009] In the present invention, a plurality of first notches are formed in the first substrate, and a plurality of second notches are formed in the second substrate. The first substrate is supported by a second support provided on the support member that holds the display unit, with a first support provided on the first case being inserted into the first notch. That is, the first substrate is positioned by the first support and supported by the second support. Similarly, the second substrate is supported by a first support provided on the support member being inserted into the second notch and supported by the first support provided on the first substrate. That is, the second substrate is positioned by the second support and supported by the first support. In this way, the first substrate and the second substrate that constitute the circuit substrate are positioned and supported by the first support and the second support that are integrally formed with the first case and the support member. Therefore, the first substrate and the second substrate can be reliably supported without increasing the number of components.

[0010] In the physical quantity measuring device of the present invention, it is preferable that an abutment portion is provided on the first case, and an elastic support portion is interposed between the abutment portion and the first substrate. In this configuration, since an elastic support member is interposed between the contact portion of the first case and the first substrate, even if there is a manufacturing tolerance in the thickness of the first substrate, the tolerance can be absorbed by the elastic support member, so that the first substrate can be reliably supported.

[0011] In the physical quantity measuring device of the present invention, it is preferable that the multiple first support parts are formed in a columnar shape protruding toward the second case, and the multiple second support parts are formed in a columnar shape protruding toward the first case. In this configuration, the first and second substrates are supported by the first and second supporting portions formed to protrude like pillars, so that the first and second substrates can be supported with a simple structure.

[0012] In the physical quantity measuring device of the present invention, it is preferable that a groove portion is formed between the first case and the second case, and that the device is provided with a sealing member having: a main body portion positioned by a plurality of the first support portions and formed into a ring shape; and a sealing portion extending from the main body portion to the outer periphery so as to be thinner than the main body portion and disposed in the groove portion. In this configuration, the main body of the sealing member is positioned by the multiple first support parts, so that the position of the sealing member can be prevented from shifting when assembling the physical quantity measuring device. This makes it easy to assemble the physical quantity measuring device. Furthermore, in this configuration, the sealing part extended to be thinner than the main body part is disposed in a groove formed between the first case and the second case, so that the width of the groove can be reduced. This makes it possible to reduce the thickness of the walls of the first case and the second case required for disposing the sealing member, so that the physical quantity measuring device can be made smaller in size.

[0013] In the physical quantity measuring device of the present invention, it is preferable that the main body is supported by the first substrate. In this configuration, the main body of the sealing member can be supported by the first substrate, so there is no need to provide a separate structure for supporting the sealing member, and therefore the structures of the first case and the second case can be simplified. [Brief description of the drawings]

[0014] [Figure 1] 1 is a perspective view showing an outline of a physical quantity measuring device according to a first embodiment of the present invention. [Diagram 2] FIG. 2 is a perspective view showing an outline of the physical quantity measuring device as viewed from a different direction from that in FIG. [Diagram 3] 1 is an exploded perspective view showing an outline of a physical quantity measuring device according to a first embodiment. [Figure 4] FIG. 4 is an exploded perspective view showing an outline of the physical quantity measuring device as viewed from a different direction from that of FIG. 3. [Diagram 5] 1 is a cross-sectional view showing an outline of a physical quantity measuring device according to a first embodiment. [Figure 6] FIG. 2 is a front view showing an outline of a first substrate and a first case according to the first embodiment. [Figure 7] FIG. 4 is a front view showing an outline of a second substrate and a second case according to the first embodiment. [Figure 8] FIG. 6 is an enlarged cross-sectional view of region VIII in FIG. 5 . [Figure 9] FIG. 11 is a perspective view showing an outline of a physical quantity measuring device according to a second embodiment. [Figure 10] 10 is a perspective view showing an outline of the physical quantity measuring device as viewed from a different direction from that in FIG. 9. [Figure 11] FIG. 11 is an exploded perspective view showing an outline of a physical quantity measuring device according to a second embodiment. [Figure 12] FIG. 12 is an exploded perspective view showing an outline of the physical quantity measuring device as viewed from a different direction from that in FIG. [Figure 13] FIG. 11 is a cross-sectional view showing an outline of a physical quantity measuring device according to a second embodiment. [Figure 14] FIG. 11 is a front view showing an outline of a first substrate and a first case according to a second embodiment. [Figure 15] FIG. 11 is a front view showing an outline of a second substrate and a second case according to a second embodiment. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0015] [First embodiment] A physical quantity measuring device 1 according to a first embodiment of the present invention will be described with reference to the drawings. Fig. 1 is a perspective view showing an outline of the physical quantity measuring device 1 of this embodiment, Fig. 2 is a perspective view showing an outline of the physical quantity measuring device 1 seen from a direction different from that of Fig. 1, Fig. 3 is an exploded perspective view showing an outline of the physical quantity measuring device 1, Fig. 4 is an exploded perspective view of the physical quantity measuring device 1 seen from a direction different from that of Fig. 3, and Fig. 5 is a cross-sectional view showing an outline of the physical quantity measuring device 1. The physical quantity measuring device 1 of this embodiment is configured as a differential pressure sensor, more specifically, a small digital micro-differential pressure sensor. As shown in FIGS. 1 to 5, the physical quantity measuring device 1 includes a first case 2, a second case 3, a circuit board 4, a sensor module 5, a base member 61, a port 62, and a sealing member .

[0016] [1st Case 2] The first case 2 is formed in a rectangular cylindrical shape and is a member for housing the sensor module 5 and the like. In this embodiment, the first case 2 has a first case body 21 and a fitting portion 22. The first case body 21 is configured to be capable of housing the sensor module 5 and the like therein. In this embodiment, the first case body 21 is provided with a first support portion 211 and a contact portion 212.

[0017] The first support portions 211 are formed in a cylindrical shape protruding toward the second case 3 at the four corners of the first case body 21. That is, in this embodiment, four first support portions 211 are provided integrally with the first case body 21 (see FIG. 6). The contact portions 212 are provided at diagonal positions on the inner side of the first support portion 211 of the first case body 21. That is, in this embodiment, the contact portions 212 are provided at two locations on the first case body 21. Each of the contact portions 212 abuts against an elastic support member 415, which will be described later.

[0018] In this embodiment, the first case body 21 has an opening 214 formed at a position corresponding to an external terminal portion 413 provided on the first substrate 41, which will be described later. This allows the external terminal portion 413 to be exposed from the outside of the first case 2. Furthermore, in this embodiment, a support structure 215 that abuts against and supports a first substrate 41 (described later) is provided on the inner periphery side of the first case body 21.

[0019] The fitting portion 22 is a thin-walled portion on the tip side of the first case body 21. The fitting portion 22 is configured to be inserted into and fitted into the inner periphery of a second case body 31 of the second case 3, which will be described later. Furthermore, in this embodiment, a groove G is formed between the fitting portion 22 and a second case body 31 of the second case 3, which will be described later.

[0020] [Second Case 3] The second case 3 is formed in a rectangular cylindrical shape like the above-mentioned first case 2, and is a member that houses a second board 42 of the circuit board 4, which will be described later, and the like. In this embodiment, the second case 3 has a second case body 31 and a panel sheet 32, and is fitted into the above-mentioned first case 2. That is, in this embodiment, the second case 3 is attached to the first case 2. The second case body 31 is configured to be capable of storing the second substrate 42 and the like therein. In this embodiment, the second case body 31 is provided with a second support portion 311, an inner wall portion 312, and a protrusion portion 313. The second case body 31 is formed so as to be flush with the first case body 21 when attached to the first case 2. Furthermore, a panel sheet 32 ​​is attached to the outer surface side of the bottom of the second case body 31, i.e., to the front surface of the second case body 31. Note that the panel sheet 32 ​​may display the model number and specifications of the physical quantity measuring device 1, although not shown in the figure.

[0021] The second support parts 311 are formed in a cylindrical shape protruding toward the first case 2 near the four corners of the second case body 31. That is, in this embodiment, four second support parts 311 are provided integrally with the second case body 31 (see FIG. 7). Also, in this embodiment, the second support parts 311 are formed so as to be disposed more inward than the first support parts 211 of the first case 2 described above.

[0022] The inner wall portion 312 is a thickened portion on the inner surface side of the second case body 31, and faces the fitting portion 22 of the first case 2 when the first case 2 and the second case 3 are fitted together. In other words, the above-mentioned groove portion G is formed between the fitting portion 22 of the first case 2 and the inner wall portion 312 of the second case 3. The protrusion 313 is provided so as to protrude in a cylindrical shape from the bottom of the second case body 31, and is configured to come into contact with the second substrate 42, which will be described later.

[0023] [Circuit board 4] FIG. 6 is a front view showing an outline of first substrate 41 and first case 2, and FIG. 7 is a front view showing an outline of second substrate 42 and second case 3. As shown in FIG. As shown in FIGS. 3 to 7, the circuit board 4 has a first substrate 41 and a second substrate 42 disposed opposite to each other.

[0024] As described above, the first substrate 41 is a substrate that is housed in the first case body 21. In this embodiment, the first substrate 41 has first cutout portions 411 formed at positions corresponding to the first support portions 211 of the first case body 21 described above, that is, at the positions of the four corners. That is, the first substrate 41 has first cutout portions 411 formed in four places. Thereby, when the first substrate 41 is housed in the first case body 21, the first support portions 211 are inserted into the first cutout portions 411. In this embodiment, the first substrate 41 is provided with a connector receiving portion 412, an external terminal portion 413, an internal terminal portion 414, and an elastic support member 415.

[0025] The connector receiving portion 412 is disposed on a surface of the first substrate 41 facing the second substrate 42. The connector receiving portion 412 is configured to be connectable to a connector portion 422 of the second substrate 42, which will be described later. As a result, the first substrate 41 and the second substrate 42 are electrically connected by connecting the connector receiving portion 412 and the connector portion 422.

[0026] As described above, the external terminal portion 413 is disposed at a position corresponding to the opening 214 of the first case body 21, and is exposed to the outside of the first case body 21 through the opening 214. This allows wiring for external output, wiring for power supply, etc. to be connected to the external terminal portion 413. In other words, the external terminal portion 413 is configured to include an external output terminal portion and a power supply terminal portion.

[0027] The internal terminal portion 414 is disposed at a position corresponding to a connection pin 55 of the sensor module 5 described later, and is configured to be connectable to the connection pin 55. Thus, the connection pin 55 is connected to the internal terminal portion 414, thereby electrically connecting the first substrate 41 and the sensor module 5. That is, in this embodiment, the first substrate 41 and the second substrate 42 are electrically connected to the sensor module 5.

[0028] The elastic support member 415 is made of metal and is a spring member having a Z-shape in cross section. In this embodiment, the elastic support member 415 is interposed between the contact portion 212 of the first case body 21 and a first board 41 of the circuit board 4 described later at a diagonal position of the first case body 21.

[0029] As described above, the second substrate 42 is a substrate that is housed in the second case body 31. In this embodiment, the second substrate 42 has second cutout portions 421 formed at positions corresponding to the second support portions 311 of the second case body 31 described above, that is, at positions near the four corners. That is, the second substrate 42 has second cutout portions 421 formed in four locations. As a result, when the second substrate 42 is housed in the second case body 31, the second support portions 311 are inserted into the second cutout portions 421.

[0030] In this embodiment, the second substrate 42 is provided with a connector portion 422. As described above, the connector portion 422 is disposed at a position corresponding to the connector receiving portion 412 of the first substrate 41, and is connectable to the connector receiving portion 412.

[0031] [Sensor module 5] The sensor module 5 includes a sensor board 51 , a sensor cover 52 , an electronic component 53 , a detection unit 54 , and a connection pin 55 . The sensor board 51 is a board on which components such as electronic components 53 and a detection unit 54 are attached. In this embodiment, the sensor board 51 is disposed opposite the above-mentioned first board 41. The surface of the sensor board 51 facing the first board 41 is covered by a sensor cover 52.

[0032] The electronic component 53 is disposed on the surface of the sensor substrate 51 facing the first substrate 41, and is covered by a sensor cover 52. In this embodiment, the electronic component 53 is configured to include a signal converter that converts and adjusts a signal output from the detection unit 54, etc. The detection unit 54 is configured to be able to detect the pressure of the fluid to be measured introduced through the port 62 and output a signal corresponding to the pressure to the electronic component 53. As described above, the connection pins 55 are disposed at positions corresponding to the internal terminal portions 414 of the first substrate 41 , and are configured to be connectable to the internal terminal portions 414 .

[0033] [Base member 61 and port 62] The base member 61 is a member formed in a plate shape, and is attached to the back surface of the first case body 21. In this embodiment, two ports 62 are attached to the base member 61, and holes (not shown) are formed at the positions where the ports 62 are attached. Furthermore, a filter (not shown) is inserted on the back side of the base member 61, i.e., on the first case body 21 side. The port 62 is formed in a cylindrical shape, and the fluid to be measured is introduced therein. As a result, the fluid to be measured is introduced into the space in the first case body 21 in which the detection unit 54 is disposed, via the port 62 and the above-mentioned filter. In addition, in this embodiment, as described above, two ports 62 are attached to the base member 61. That is, in this embodiment, the physical quantity measuring device 1 is configured as a differential pressure sensor that detects the differential pressure of the fluid to be measured introduced into the two ports 62. It should be noted that the present invention is not limited to the above configuration, and for example, the filter does not have to be inserted on the rear side of the base member 61 .

[0034] [Sealing member 7] FIG. 8 is an enlarged cross-sectional view of region VIII in FIG. 5, 6 and 8, the sealing member 7 is made of rubber or resin and seals the space between the first case 2 and the second case 3. This makes it possible to hermetically seal the internal spaces of the first case 2 and the second case 3 when the first case 2 and the second case 3 are fitted together. In this embodiment, the sealing member 7 has a main body portion 71 and a sealing portion 72.

[0035] The main body portion 71 has a rectangular ring shape. In this embodiment, the main body portion 71 is supported by the first substrate 41. This eliminates the need to provide a separate structure for supporting the main body portion 71 of the sealing member 7 in the first case 2. Moreover, in this embodiment, the main body 71 is disposed outside the first support parts 211 provided at the four corners of the first case body 21. That is, the main body 71 is positioned by the four first support parts 211. This makes it possible to suppress deviation of the position of the sealing member 7 when assembling the physical quantity measuring device 1, thereby facilitating assembly of the physical quantity measuring device 1.

[0036] The sealing portion 72 is provided extending outward from the main body portion 71, and is disposed in the above-mentioned groove portion G. This provides a seal between the first case 2 and the second case 3. Moreover, in this embodiment, the sealing portion 72 is formed to have a smaller thickness than the main body portion 71. This allows the width of the groove portion G in which the sealing portion 72 is to be disposed to be reduced. As a result, the thickness of the walls of the first case 2 and the second case 3 required for disposing the sealing member 7 can be reduced, allowing the physical quantity measuring device 1 to be made more compact.

[0037] [Support structure of first substrate 41 and second substrate 42] Next, the support structure for first substrate 41 and second substrate 42 will be described. As described above, the support structure 215 of the first case 2 abuts against the surface of the first substrate 41 that faces the sensor module 5. This allows the first substrate 41 to be supported by the first case 2. Furthermore, the second support portion 311 inserted into the second cutout portion 421 of the second substrate 42 abuts against the surface of the first substrate 41 that faces the second substrate 42. That is, the first substrate 41 is also supported by the second case 3. In this way, the first substrate 41 is supported by being sandwiched between the support structure 215 of the first case 2 and the second support portion 311 of the second case 3. Furthermore, the first substrate 41 has the first support portion 211 inserted into the first cutout portion 411. As a result, the first substrate 41 is positioned by the first support portion 211 of the first case 2. Thus, in this embodiment, the first substrate 41 is sandwiched between the first case 2 and the second case 3, and is positioned and supported by the first case 2. Therefore, the first substrate 41 can be reliably supported.

[0038] Similarly, the protrusion 313 of the second case 3 abuts against the surface of the second substrate 42 that faces the bottom of the second case 3. As a result, the second substrate 42 is supported by the second case 3. Furthermore, the first support portion 211 inserted into the first cutout portion 411 of the first substrate 41 abuts against the surface of the second substrate 42 that faces the first substrate 41. That is, the second substrate 42 is also supported by the first case 2. In this way, the second substrate 42 is supported by being sandwiched between the protrusion 313 of the second case 3 and the first support portion 211 of the first case 2. Furthermore, the second substrate 42 has the second support portion 311 inserted into the second cutout portion 421. As a result, the second substrate 42 is positioned by the second support portion 311 of the second case 3. Thus, in this embodiment, the second substrate 42 is sandwiched between the first case 2 and the second case 3, and is positioned and supported by the second case 3. Therefore, the second substrate 42 can be reliably supported.

[0039] Furthermore, in this embodiment, as described above, the elastic support member 415 configured as a spring member is interposed between the abutment portion 212 of the first case 2 and the first substrate 41. As a result, the first substrate 41 is biased toward the second case 3 by the elastic support member 415. Therefore, even if a manufacturing tolerance occurs in the thickness of the first substrate 41, the tolerance can be absorbed by the elastic support member 415. Therefore, the first substrate 41 and the second support portion 311 can be reliably abutted against each other, and therefore the first substrate 41 can be reliably supported.

[0040] [Effects of the first embodiment] The present embodiment as described above can provide the following effects. (1) In this embodiment, the first substrate 41 has four first notch portions 411, and the second substrate 42 has four second notch portions 421. The first substrate 41 has the first support portion 211 provided in the first case 2 inserted into the first notch portion 411, and is supported by the second support portion 311 provided in the second case 3. That is, the first substrate 41 is positioned by the first support portion 211, and is supported by the second support portion 311. Similarly, the second substrate 42 has the second support portion 311 provided in the second case 3 inserted into the second notch portion 421, and is supported by the first support portion 211 provided in the first case 2. That is, the second substrate 42 is positioned by the second support portion 311, and is supported by the first support portion 211. In this way, the first substrate 41 and the second substrate 42 constituting the circuit board 4 are positioned and supported by the first support portion 211 and the second support portion 311 formed integrally with the first case 2 and the second case 3. Therefore, the first substrate 41 and the second substrate 42 can be reliably supported without increasing the number of parts.

[0041] (2) In this embodiment, the elastic support member 415 is interposed between the contact portion 212 of the first case 2 and the first substrate 41. Therefore, even if a manufacturing tolerance occurs in the thickness of the first substrate 41, the tolerance can be absorbed by the elastic support member 415. Therefore, the first substrate 41 can be reliably supported.

[0042] (3) In this embodiment, the first substrate 41 and the second substrate 42 are supported by the first support portion 211 and the second support portion 311 which are formed to protrude like columns, so that the first substrate 41 and the second substrate 42 can be supported with a simple structure.

[0043] (4) In the present embodiment, the main body 71 of the sealing member 7 is positioned by the four first support portions 211, and therefore, when the physical quantity measuring device 1 is assembled, it is possible to suppress deviation in position of the sealing member 7. This makes it possible to easily assemble the physical quantity measuring device 1. Furthermore, since the sealing portion 72, which is extended so as to have a smaller thickness than the main body portion 71, is disposed in the groove portion G formed between the first case 2 and the second case 3, it is possible to reduce the width of the groove portion G. This makes it possible to reduce the thickness of the walls of the first case 2 and the second case 3 required for disposing the sealing member 7, and therefore it is possible to miniaturize the physical quantity measuring device 1.

[0044] (5) In this embodiment, the main body 71 of the sealing member 7 can be supported by the first substrate 41, so there is no need to provide a separate structure for supporting the sealing member 7. As a result, the structures of the first case 2 and the second case 3 can be simplified.

[0045] (6) In this embodiment, the first case 2 is provided with a support structure 215 that abuts against and supports the first substrate 41. As a result, the first substrate 41 is sandwiched between the support structure 215 of the first case 2 and the second support portion 311 of the second case 3, so that the first substrate 41 can be reliably supported.

[0046] (7) In this embodiment, the second case 3 is provided with a protrusion 313 that abuts against and supports the second substrate 42. As a result, the second substrate 42 is sandwiched between the first support portion 211 of the first case 2 and the protrusion 313 of the second case 3, so that the second substrate 42 can be reliably supported.

[0047] [Second embodiment] Next, a physical quantity measuring device 1A according to a second embodiment of the present invention will be described with reference to the drawings. In the physical quantity measuring device 1A according to the second embodiment, the first substrate 41A is supported by a second support portion 93A provided on a support member 9A that holds a display unit 8A, and the second substrate 42A is positioned by the second support portion 93A, which is different from the first embodiment. In the second embodiment, the same or similar configurations as those in the first embodiment are denoted by the same reference numerals, and the description thereof is omitted. In addition, the first substrate 41A of the second embodiment has a first cutout portion 411A, a connector receiving portion 412A, an external terminal portion 413A, an internal terminal portion 414A, and an elastic support member 415A, similar to the first substrate 41 of the first embodiment described above. In addition, the second substrate 42A has a second cutout portion 421A and a connector portion 422A, similar to the second substrate 42 of the first embodiment described above.

[0048] FIG. 9 is a perspective view showing an outline of the physical quantity measuring device 1A of this embodiment, FIG. 10 is a perspective view showing an outline of the physical quantity measuring device 1A seen from a direction different from that of FIG. 9, FIG. 11 is an exploded perspective view showing an outline of the physical quantity measuring device 1A, FIG. 12 is an exploded perspective view of the physical quantity measuring device 1A seen from a direction different from that of FIG. 11, and FIG. 13 is a cross-sectional view showing an outline of the physical quantity measuring device 1A. As shown in FIGS. 9 to 13, the physical quantity measuring device 1A includes a second case 3A, a circuit board 4A, a display unit 8A, and a support member 9A.

[0049] [Case 2 3A] The second case 3A is formed in a rectangular cylindrical shape like the second case 3 described above, and is a member that houses a second substrate 42A of the circuit board 4A, a display unit 8A, a support member 9A, and the like, which will be described later. In this embodiment, the second case 3A has a second case body 31A and a panel sheet 32A, and is fitted into the above-mentioned first case 2. That is, in this embodiment, the second case 3A is attached to the first case 2. The second case body 31A is configured to be capable of storing the second substrate 42A, the display unit 8A, the support member 9A, and the like therein. The second case body 31A is formed so as to be flush with the first case body 21 when attached to the first case 2. Furthermore, an opening 314A is formed at the bottom of the second case body 31A. This allows the user to view the display unit 8A through the opening 314A. A panel sheet 32A is attached to the outer surface side of the bottom of the second case body 31A, that is, the front surface of the second case body 31A, so as to surround the opening 314A. A button operation unit 315A is provided below the opening 314A. In this embodiment, three button operation units 315A are provided, and this allows the user to perform various operations by operating the button operation units 315A.

[0050] [Display section 8A] The display unit 8A is a liquid crystal display (LCD) that digitally displays the differential pressure detected by the sensor module 5, and is electrically connected to the second board 42A of the circuit board 4A. In this embodiment, it is fitted into a display holding recess 92A of the support member 9A, which will be described later, and is clamped and held by a display holding claw 94A. As described above, the differential pressure digitally displayed on the display unit 8A can be visually confirmed through the opening 314A of the second case body 31A.

[0051] [Support member 9A] The support member 9A is a member that is housed in the second case body 31A and holds the display unit 8A. Furthermore, in this embodiment, the support member 9A is configured to position the second substrate 42A and to support the first substrate 41A. The support member 9A includes a support member main body 91A, a display holding recess 92A, a second support portion 93A, and a display holding tab 94A.

[0052] The support member main body 91A is formed in a substantially rectangular parallelepiped shape and is disposed between the display unit 8A and the second substrate 42A. A display holding recess 92A recessed according to the shape of the display unit 8A is formed on the surface of the support member main body 91A on the display unit 8A side. Furthermore, two display holding claws 94A extending toward the display unit 8A are formed on the outer periphery of the support member main body 91A. As a result, the support member main body 91A is configured to hold the display unit 8A by fitting the display unit 8A into the display holding recess 92A and by clamping the display unit 8A with the display holding claws 94A. The display holding recess 92A and the display holding claws 94A constitute the display holding unit of the present invention. Further, a second support portion 93A protruding toward the first case 2 is provided on the second substrate 42A side of the support member main body 91A.

[0053] The second support portions 93A are provided near the four corners of the support member 9A and protrude toward the first case 2. In this embodiment, the second support portions 93A have claw-shaped support portions 931A and columnar support portions 932A. The claw-shaped support portion 931A is formed integrally with the support member 9A in a claw shape. In this embodiment, two claw-shaped support portions 931A are provided. The columnar support portion 932A is formed integrally with the support member 9A in a columnar shape. In this embodiment, two columnar support portions 932A are provided. That is, in this embodiment, four second support portions 93A are provided.

[0054] [Support structure of first substrate 41A and second substrate 42A] Next, a support structure for first substrate 41A and second substrate 42A of circuit board 4A will be described. FIG. 14 is a front view showing an outline of first substrate 41 and first case 2, and FIG. 15 is a front view showing an outline of second substrate 42A and second case 3A. As shown in FIGS. 9 to 15, the support structure 215 of the first case 2 abuts against the surface of the first substrate 41A facing the sensor module 5. This allows the first substrate 41A to be supported by the first case 2. Furthermore, the second support portion 93A inserted into the second cutout portion 421A of the second substrate 42A abuts against the surface of the first substrate 41A facing the second substrate 42A. That is, the first substrate 41A is also supported by the support member 9A housed in the second case 3A. In this way, the first substrate 41A is supported by being sandwiched between the support structure 215 of the first case 2 and the second support portion 93A of the support member 9A. Furthermore, in the first substrate 41A, the first support portion 211 is inserted into the first cutout portion 411A. As a result, the first substrate 41A is positioned by the first support portion 211 of the first case 2. Thus, in this embodiment, the first substrate 41A is sandwiched between the first case 2 and the supporting member 9A, and is positioned and supported by the first case 2. Therefore, the first substrate 41A can be reliably supported.

[0055] Similarly, the second substrate 42A abuts against the surface of the support member 9A facing the support member main body 91A on the opposite side to the surface on which the display holding recess 92A of the support member main body 91A is formed. This allows the second substrate 42A to be supported by the support member 9A. Furthermore, the first support portion 211 inserted into the first cutout portion 411A of the first substrate 41A abuts against the surface of the second substrate 42A facing the first substrate 41A. That is, the second substrate 42A is also supported by the first case 2. In this way, the second substrate 42A is supported by being sandwiched between the support member 9A and the first support portion 211 of the first case 2. Furthermore, the second support portion 93A of the second substrate 42A is inserted into the second cutout portion 421A, whereby the second substrate 42A is positioned by the second support portion 93A of the support member 9A. Thus, in this embodiment, the second substrate 42A is sandwiched between the first case 2 and the supporting member 9A, and is positioned and supported by the supporting member 9A. Therefore, the second substrate 42A can be reliably supported.

[0056] [Effects of the second embodiment] The present embodiment as described above can provide the following effects. (8) In this embodiment, the first substrate 41A is supported by the second support portion 93A provided on the support member 9A, while the first support portion 211 provided on the first case 2 is inserted into the first cutout portion 411A. That is, the first substrate 41A is positioned by the first support portion 211, and is supported by the second support portion 93A. Similarly, the second substrate 42A is supported by the first support portion 211 provided on the support member 9A, while the second support portion 93A is inserted into the second cutout portion 421A. That is, the second substrate 42A is positioned by the second support portion 93A, and is supported by the first support portion 211 provided on the first case 2. In this manner, the first substrate 41A and the second substrate 42A constituting the circuit board 4A are positioned and supported by the first support portion 211 and the second support portion 93A formed integrally with the first case 2 and the support member 9A. Therefore, the first substrate 41A and the second substrate 42A can be reliably supported without increasing the number of parts.

[0057] [Variations] The present invention is not limited to the above-described embodiments, and modifications and improvements within the scope of the present invention that can achieve the object of the present invention are included in the present invention.

[0058] In the above-described embodiments, the elastic support members 415, 415A that contact the contact portion 212 of the first case 2 are Z-shaped in cross section and configured as spring members, but are not limited thereto. For example, the elastic support members may be configured as coil spring members as long as they are configured to be able to bias the first substrate toward the second case. Furthermore, the present invention also includes an embodiment in which no elastic support member is provided.

[0059] In the above-described embodiments, the first substrate 41, 41A is housed in the first case 2, but this is not limiting. For example, the first substrate may be housed in the second case. Similarly, in each of the above-described embodiments, the second substrate 42, 42A is housed in the second case 3, 3A, but this is not limiting. For example, the second substrate may be housed in the first case.

[0060] In the first embodiment, the first support portion 211 and the second support portion 311 are formed in a cylindrical shape, but are not limited thereto. For example, the first support portion and the second support portion may be formed in a prismatic shape, or may be formed in a cylindrical shape with a hollow interior. Similarly, in the second embodiment, the second support portion 93A is formed in a claw shape or a cylindrical shape, but is not limited thereto. For example, the first support portion and the second support portion may be formed in a prismatic shape, or may be formed in a cylindrical shape with a hollow interior.

[0061] In the above-described embodiments, the first support portion 211 and the second support portion 311, 93A are provided in four pieces, but the present invention is not limited to this. For example, the first support portion and the second support portion may be provided in five pieces or more, or three pieces or less, as long as a plurality of first support portions and second support portions are provided.

[0062] In each of the above-described embodiments, the sealing member 7 includes the main body 71 formed in a rectangular ring shape and the sealing portion 72 extending outward from the main body 71, but is not limited thereto. For example, the sealing member may be formed only of the main body disposed in the groove formed between the first case and the second case.

[0063] In each of the above-described embodiments, the physical quantity measuring device 1 is configured as a differential pressure sensor that detects the differential pressure of the measurement target fluid introduced into the two ports 62, but is not limited thereto. For example, the physical quantity measuring device may be configured as a pressure sensor that has one port and detects the pressure of the measurement target fluid introduced into the port, or as a temperature sensor that detects the temperature of the measurement target fluid, and may be configured to be capable of detecting the physical quantity of the measurement target fluid.

[0064] In the above-described embodiments, the first substrate 41, 41A has the first cutouts 411, 411A formed at the four corners, but is not limited thereto. For example, the first substrate may have a plurality of first cutouts formed near the center, and the first support portion of the first case may be inserted into the first cutouts. The positions and number of the first cutouts in the first substrate may be arbitrary. Similarly, in each of the above-described embodiments, the second substrate 42, 42A has the second cutouts 421, 421A formed near the four corners, but this is not limited thereto. For example, the second substrate may have a plurality of second cutouts formed near the center, and the second support portion of the second case may be inserted into the second cutouts. The positions and number of the second cutouts in the second substrate may be arbitrary. [Explanation of symbols]

[0065] Reference Signs List 1,1A...physical quantity measuring device, 2...first case, 3,3A...second case, 4,4A...circuit board, 5...sensor module, 7...sealing member, 8A...display unit, 9A...support member, 21...first case body, 22...fitting portion, 31,31A...second case body, 32,32A...panel sheet, 41,41A...first board, 42,42A...second board, 51...sensor board, 52...sensor cover, 53...electronic component, 54...detection unit, 55...connection pin, 61...base member, 62...port, 71...main body, 72...sealing portion, 91A...support member main body, 92A...display holding recess , 93A...second support portion, 94A...display retaining claw portion, 211...first support portion, 212...abutment portion, 214...opening, 215...support structure, 311...second support portion, 312...inner wall portion, 313...protrusion portion, 314A...opening, 315A...button operation portion, 411, 411A...first notch portion, 412, 412A...connector receiving portion, 413, 413A...external terminal portion, 414, 414A...internal terminal portion, 415, 415A...elastic support member, 421, 421A...second notch portion, 422, 422A...connector portion, 931A...claw-shaped support portion, 932A...cylindrical support portion, G...groove portion.

Claims

1. a sensor module having a detection unit for detecting a physical quantity of a fluid to be measured; a circuit board having a first board and a second board electrically connected to the sensor module and arranged opposite to each other; a first case that houses the sensor module and the first substrate; a second case attached to the first case and housing the second substrate; A display unit provided in the second case; a support member that is housed in the second case and has a display holder that holds the display unit, A plurality of first cutout portions are formed in the first substrate, A plurality of second cutout portions are formed in the second substrate, a plurality of first support portions are integrally formed in the first case and are inserted into the first cutout portions to support the second substrate; The support member is integrally formed with a plurality of second support portions that are inserted into the second cutout portions and support the first substrate. A physical quantity measuring device comprising:

2. 2. The physical quantity measuring device according to claim 1, A groove is formed between the first case and the second case, a sealing member including a main body portion formed in an annular shape and positioned by a plurality of the first support portions, and a sealing portion extending from the main body portion to the outer periphery side so as to have a smaller thickness than the main body portion and disposed in the groove portion; A physical quantity measuring device comprising:

3. a sensor module having a detection unit for detecting a physical quantity of a fluid to be measured; a circuit board having a first board and a second board electrically connected to the sensor module and arranged opposite to each other; a first case that houses the sensor module and the first substrate; a second case attached to the first case and housing the second board; A plurality of first cutout portions are formed in the first substrate, A plurality of second cutout portions are formed in the second substrate, a plurality of first support portions are integrally formed in the first case and are inserted into the first cutout portions to support the second substrate; a plurality of second support portions are integrally formed in the second case and are inserted into the second cutout portions to support the first substrate; The first substrate is provided with an external terminal portion, The first case has an opening formed at a position corresponding to the external terminal portion, A groove is formed between the first case and the second case, a sealing member including a main body portion formed in an annular shape and positioned by a plurality of the first support portions, and a sealing portion extending from the main body portion to the outer periphery side so as to have a smaller thickness than the main body portion and disposed in the groove portion; A physical quantity measuring device comprising:

4. 4. The physical quantity measuring device according to claim 2, The main body is supported by the first substrate. A physical quantity measuring device comprising:

5. The physical quantity measuring device according to any one of claims 1 to 3, The first case is provided with a contact portion, An elastic support portion is interposed between the contact portion and the first substrate. A physical quantity measuring device comprising:

6. The physical quantity measuring device according to any one of claims 1 to 3, The first support portions are formed in a columnar shape protruding toward the second case, The second support portions are formed in a columnar shape protruding toward the first case. A physical quantity measuring device comprising:

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