JP4822518B2 - Pressure sensor mounting structure and fixture - Google Patents

Description

  The present invention relates to a pressure sensor mounting structure and a mounting tool.

As a pressure sensor, one that displays the pressure of a fluid (gas or liquid) measured by a pressure detection element provided in a casing on a display unit provided on the front surface of the casing is known. In many cases, such a pressure sensor is provided with an introduction port for connecting a tube for taking a fluid to the back side and a connector for connecting a cable terminal. When attaching such a pressure sensor to a wall surface with the back surface facing the wall surface side, as shown in the following Patent Document 1, etc., a hole for fitting the pressure sensor is provided in the wall surface so that the tube or cable is mounted on the wall surface. May be routed behind the back.
JP 2004-207283 A

  However, the method of making a hole in the wall surface as described above has a problem that it takes time and effort. As a countermeasure for this, it is conceivable that the pressure sensor is supported at a position floating on the near side from the wall surface by using a fixture without providing the hole as described above, and the tube or cable is routed on the near side of the wall surface. . However, in this case, if the tube or cable is simply hung from the back of the pressure sensor, for example, when the tube is pushed and bent in front of the wall or the cable is pulled, it is directly connected to the connection part of the cable with the pressure sensor. There is a risk of stress.

  The present invention has been completed based on the above-described circumstances, and an object thereof is to simplify the attachment of a pressure sensor and facilitate the routing of a tube or a cable.

As a means for achieving the above object, the pressure sensor mounting structure according to the invention of claim 1 is a structure in which the pressure sensor is mounted on the wall surface via a mounting tool, and the pressure sensor includes a casing, A cable led out from the back surface of the casing; an introduction port provided on the back surface of the casing for introducing fluid; and a detection means provided in the casing for detecting the pressure of the fluid introduced by the introduction port. The fixture includes a wall surface fixing portion for fixing the fixture to the wall surface, a sensor support portion fixed to the back surface of the casing and supporting the casing at a position spaced apart from the wall surface, and the introduction port. A fluid introduction path that is connected and introduces fluid from the outside in the lateral direction of the sensor support portion to the introduction port; and provided in the sensor support portion. The has a storage portion for storing the cable derived from the casing, characterized the cable provided in the side surface direction of the sensor support portion was provided with a cable lead-out portion guided outward from the housing portion.
Here, the “side surface direction of the sensor support portion” refers to a direction along the wall surface.

  The invention according to claim 2 is the connector according to claim 1, wherein a connector portion is provided at an end portion of the cable, and a connector fitting portion capable of fitting and connecting the connector portion to the back surface of the casing. The connector portion includes a lock portion that can be fitted to the connector fitting portion and can be operated to release the fitting, and the fixture opens the rear of the connector portion. The lock portion includes a release portion that can be released from the outside of the fixture.

  According to a third aspect of the present invention, in the first or second aspect of the present invention, the cable lead-out portion has a groove shape and a cable entrance for allowing the cable to enter from a radial direction. It is characterized in that the width dimension of the cable entrance is smaller than the inner width dimension.

  According to a fourth aspect of the present invention, in the device according to any one of the first to third aspects, the cable lead-out portion is provided at a plurality of locations in which the direction in which the cable is guided differs in the side surface direction of the sensor support portion. It is characterized by

  According to a fifth aspect of the present invention, in the device according to any one of the first to fourth aspects, the cable lead-out portion forms a groove shape having a pair of opposed groove walls and forms the fixture. The pair of molds extends in an oblique direction with respect to the mold opening direction, and the fixture is characterized in that the mold opening direction of each groove wall is open.

  The invention according to claim 6 is the one according to any one of claims 1 to 5, wherein the back surface of the casing and the sensor support portion have a plurality of different directions around an axis centering on the introduction port. The housing portion can be fixed in a fixed posture, and the housing portion has a shape capable of guiding the cable to a position corresponding to the cable lead-out portion in each of the fixed postures.

  A fixture according to a seventh aspect of the invention is characterized in that it is used in the pressure sensor mounting structure according to any one of the first to sixth aspects.

<Invention of Claims 1 and 7>
Since the pressure sensor is supported at a position separated from the wall surface by the mounting tool, the pressure sensor can be mounted without making a hole for fitting the pressure sensor in the wall surface, and the mounting operation is simple. Further, by connecting the tube or the like to the fluid introduction portion, the fluid can be introduced into the introduction port without pushing and bending the tube or the like, so that the tube or the like can be easily routed. Furthermore, since the cable is led out by the cable lead-out portion, the cable can be easily routed.

<Invention of Claim 2>
Since the fixture has an open part that opens the back of the connector part and allows the lock part to be released, the connector part can be fitted and detached while the fixture is fixed to the back of the pressure sensor. The workability in the case of changing the mounting location is good.

<Invention of Claim 3>
Since the cable lead-in portion of the cable lead-out portion is narrowed, the cable inserted into the cable lead-out portion is difficult to come out to the outside.

<Invention of Claim 4>
Since the cable lead-out portions are provided at a plurality of locations where the directions of guiding the cables are different, the degree of freedom in routing the cables is increased.

<Invention of Claim 5>
Even when the cable lead-out portion extends obliquely with respect to the mold opening direction of the pair of molds for forming the fixture, the mold opening direction of the pair of groove walls constituting the guide groove is opened. Therefore, the guide groove can be formed by the pair of molds.

<Invention of Claim 6>
The pressure sensor can be fixed to the fixture in a plurality of fixed postures around the axis. Thereby, it becomes possible to freely select the mounting direction of the pressure sensor and the cable drawing direction.

<Embodiment 1>
Next, Embodiment 1 of the present invention will be described with reference to FIGS.
In this embodiment, the structure for attaching the pressure sensor 1 to the wall surface W using the fixture 20 is illustrated. In the following description, the vertical direction is based on FIG. 9, and the right side (wall surface W side) of FIG. 9 is the rear.

  As shown in FIGS. 1 and 2, the pressure sensor 1 has a configuration in which a detection means 3 for detecting the pressure of a fluid (gas or liquid) is accommodated in a substantially cubic casing 2. As shown in FIG. 9, the detection means 3 includes a detection circuit board 3A and a diaphragm type pressure detection element 3B mounted on the upper surface thereof. Further, on the front surface of the casing 2, a display unit 4 for displaying the pressure detected by the detection unit 3 and three operation buttons 5 for performing various operations are provided.

  The rear surface of the casing 2 is a substantially square fixture fixing surface 6 to which a fixture 20 described later is fixed. A cylindrical introduction port 7 is provided at the center of the fixture fixing surface 6 so as to protrude rearward, and fluid is introduced from the introduction port 7 into the pressure detection element 3B.

  Further, the fixture fixing surface 6 is provided with a cable connecting connector 9 (corresponding to the “connector fitting portion” of the present invention) mounted on the detection circuit board 3A in the upper center. As shown in FIG. 9, the connector portion 11 provided at the end portion of the cable 10 is fitted to the cable connecting connector 9, thereby supplying electric power from the outside via the cable 10 and connecting to the outside. A detection signal is output. The upper surface of the connector portion 11 is provided with a lock portion 12 that can be bent and deformed vertically. When the connector portion 11 is fitted to the cable connection connector 9, the lock portion 12 is attached to the cable connection connector 9. By engaging with the provided locking claw 9A, both connectors 9 and 11 are locked in the fitted state. Further, the end of the lock portion 12 is an operation portion 12A, and the engagement is released by pushing down the operation portion 12A from the engaged state with the lock claw 9A to bend and deform the lock portion 12. ing.

  Further, the fixture fixing surface 6 of the casing 2 is recessed with screw hole portions 14 capable of screwing screws 13 (see FIG. 9) for fixing the fixture 20 at the four corners. Each screw hole portion 14 is disposed at a position that is point-symmetric with an interval of 90 degrees with respect to the central axis of the fixture fixing surface 6 (the central axis of the introduction port 7).

  On the other hand, as shown in FIGS. 3 to 8, the fixture 20 is integrally formed by aluminum die casting or the like. The fixture 20 has a substantially rectangular shape when viewed from the front, and a sensor support portion 21 for supporting the pressure sensor 1 at a position separated from the wall surface W is provided at an upper portion thereof, and an attachment portion is provided at a lower portion thereof. A wall surface fixing portion 25 for fixing the tool 20 to the wall surface W is provided.

  The sensor support portion 21 has a box shape opened rearward as a whole, and the rear surface thereof has a housing portion 21A having a substantially U-shape for housing the connector portion 11 and the cable 10 (the “opening portion of the present invention”). Is equivalent). On the front surface of the sensor support portion 21, a sensor fixing portion 22 having a square shape substantially the same size as the fixture fixing surface 6 is formed, and screw insertion holes 23 are formed penetrating front and rear at the four corners. Has been. Each screw insertion hole 23 is arranged at a position that is aligned with the screw hole portion 14, that is, at a point symmetry with respect to the central axis of the sensor fixing portion 22. Then, the fixture fixing surface 6 of the casing 2 is overlapped on the sensor fixing portion 22, and the screws 13 inserted through the screw insertion holes 23 from the rear are screwed to the screw hole portions 14, whereby the pressure sensor 1 and the fixture are mounted. 20 are fixed to each other.

  The wall surface fixing portion 25 includes a substantially rectangular parallelepiped base portion 26 swelled in front of the sensor fixing portion 22 at the center in the left-right direction. On both left and right side surfaces of the base portion 26, plate-like mounting pieces 28 having screw insertion holes 27 penetrating in the front-rear direction at the rear end position are formed extending sideways. The rear end surface of the wall surface fixing portion 25 and the rear end surface of the sensor support portion 21 are flush with each other, the rear end surfaces of the wall surface fixing portion 25 and the sensor support portion 21 are applied to the wall surface W, and the screw insertion holes 27 of the respective attachment pieces 28. The fixture 20 is fixed to the wall surface W by screwing the screw 29 (see FIG. 10) inserted through the front into the wall surface W.

  A cylindrical port connection 31 is provided at the center of the sensor support 21. The port connection portion 31 is closed at the rear surface, the front surface is opened at the center of the sensor fixing portion 22, and the introduction port 7 of the pressure sensor 1 is inserted into the front surface from the opening. An annular seal ring (not shown) is attached to the inner peripheral surface of the opening of the port connection portion 31, and the outer peripheral surface of the introduction port 7 inserted into the introduction port 7 by this seal ring and the port connection portion 31. The space between them is closed in a watertight manner. The fixture 20 is further provided with a fluid introduction path 32 extending linearly in the vertical direction. The upper end of the fluid introduction path 32 opens to the inner peripheral surface of the port connection portion 31, and the lower end is the base portion 26. Through the top and bottom and is open at the approximate center of the bottom surface. That is, the fluid introduction path 32 is connected to the introduction port 7 from a substantially orthogonal direction (side surface direction of the sensor support portion 21). A female screw is formed on the inner peripheral surface of the opening on the lower side of the fluid introduction path 32, and a male thread-like connection member 34 provided at the tip of the tube 33 is screwed into the tube 33, thereby The fluid introduction path 32 is connected, and the fluid taken from the tube 33 is introduced into the introduction port 7 through the fluid introduction path 32.

  Since the wall fixing part 25 and the base part 26 constituting the fluid introduction path 32 are integrally provided on the same side with respect to the sensor support part 21, both 25 and 26 are provided on different sides. Compared with the case, the fixture 20 can be reduced in size. Moreover, since the vicinity of the base portion 26 which is a place where a large force is easily received from the cable 10 is fixed to the wall surface W, the fixture 20 can be firmly fixed.

  On the front side of the sensor support portion 21, release operation holes 35 (corresponding to the “opening portion” of the present invention) are provided in the upper portion and the left and right side portions of the port connection portion 31. Each release operation hole 35 is formed by connecting the front surface of the port connection portion 31 and the upper surface or left and right side surfaces of the sensor support portion 21 into a rectangular shape. Each release operation hole 35 allows the connector portion 11 to be inserted and the operation portion 12A of the lock portion 12 to be exposed to the outer surface when the fixture 20 is attached to the pressure sensor 1 in each posture as will be described later.

  Further, in the rear end portion of the sensor support portion 21, a groove portion 36 (corresponding to the “cable lead-out portion” of the present invention) that opens rearward is formed in the center of the upper side and the left and right sides. . By inserting the cable 10 into each groove 36, the cable 10 can be guided from the inside to the outside of the accommodating portion 21A.

  A pair of guide grooves 37 (corresponding to the “cable lead-out portion” of the present invention) are further formed in the fixture 20 from the lower left and right ends of the sensor support portion 21 to the upper portion of the left and right attachment pieces 28. Each guide groove 37 has a groove wall 37A formed obliquely downward and rearward by notching the lower part on the sensor support portion 21 side, and an obliquely upper side by notching the upper part of the attachment piece 28 so as to face the groove wall 37A. It is formed between the groove wall 37B formed in the forward direction, and extends obliquely downward and forward as a whole. Further, the upper portion of the guide groove 37 is configured to communicate with the accommodating portion 21A in a state where the fixture 20 is attached to the wall surface W (see FIG. 9), and the cable 10 in the accommodating portion 21A is connected to the guide groove 37. The cable 10 can be led obliquely downward and forward by being inserted through the cable.

  Here, the attachment 20 is formed by a pair of front and rear molds in which all parts except the fluid introduction path 32 are clamped and opened in the front-rear direction. As shown in FIG. 6, the guide groove 37 does not overlap the groove wall 37 </ b> A and the groove wall 37 </ b> B in the direction perpendicular to the sensor fixing portion 22 (sensor mounting surface). Since the rear of the groove wall 37A (see arrow B) and the front of the groove wall 37B (see arrow C) are open, the mold is opened in the front-rear direction as described above. It can be formed by a pair of molds.

  Each guide groove 37 is opened outward, and the opening serves as a cable entrance 37C for allowing the cable 10 to enter the guide groove 37 from the radial direction. As shown in FIG. 8, the cable entrance 37 </ b> C has a width dimension smaller than the width dimension inside the guide groove 37 because the groove walls 37 </ b> A and 37 </ b> B on both sides project inward. The width dimension of the cable entrance 37C is set to be the same as or slightly larger than the outer diameter of the cable 10. For this reason, when the cable 10 is inserted into the guide groove 37, the cable 10 is pushed into the cable entrance 37 </ b> C while being compressed, and the cable 10 inserted into the guide groove 37 is unlikely to come off the guide groove 37.

  When attaching the pressure sensor 1 to the wall surface W, the posture (direction) of fixing the fixture 20 to the pressure sensor 1 according to the pulling direction of the tube 33 (downward, leftward and rightward directions of the pressure sensor 1). ) Is decided. That is, when the tube 33 is pulled out below the pressure sensor 1, the wall surface fixing portion 25 of the fixture 20 comes below the pressure sensor 1 as shown in FIG. Are fixed to each other using four screws 13. When the tube 33 is pulled out to the side of the pressure sensor 1, as shown in FIG. 10, the wall surface fixing portion 25 of the fixture 20 is placed on either the left or right side of the pressure sensor 1, so that the pressure sensor 1 and the fixture 20 are fixed to each other. Subsequently, the end of the tube 33 is connected to the fluid introduction path 32 of the fixture 20.

  Next, the connector portion 11 is inserted into the housing portion 21 </ b> A of the fixture 20 from the opening on the rear surface, and the connector portion 11 is fitted and connected to the cable connection connector 9 of the pressure sensor 1. Then, the cable 10 is pulled out from the accommodating portion 21A to the outside in either the up, down, left, or right direction. When the cable 10 is pulled out from the side where the wall surface fixing portion 25 is located, as shown in FIG. As shown in FIG. 10, when the cable 10 is pulled out to the other side, the cable 10 is inserted into one of the three grooves 36. Here, since the accommodating portion 21 </ b> A is a substantially U-shaped space communicating with each groove portion 36 and the guide groove 37, the cable 10 extending from the casing 2 is connected to the groove portion 36 or the guide groove 37 on either side. Can also lead to. And the attachment of the pressure sensor 1 is completed by applying the fixture 20 to the wall surface W and screwing. As shown in FIG. 10, a plurality of pressure sensors 1 can be mounted in a line in the vertical or horizontal direction in a state of being in close contact with each other.

  As described above, according to the present embodiment, the pressure sensor 1 is supported by the fixture 20 at a position separated from the wall surface W, so that the pressure sensor 1 can be attached to the wall surface W without opening a hole for fitting. Easy installation work. In addition, by connecting the tube 33 and the like to the fluid introduction path 32, the fluid can be introduced into the introduction port 7 without pushing and bending the tube 33 and the like, so that the tube 33 can be easily routed. Furthermore, since the cable 10 is guided to the outside by the groove 36 or the guide groove 37, the cable 10 can be easily routed.

  Further, since the fixture 20 includes the accommodating portion 21A and the release operation hole 35 that open the rear of the connector portion 11 and allows the lock portion 12 to be disengaged, the fixture 20 is provided on the back surface of the pressure sensor 1. The connector portion 11 can be engaged and disengaged while the connector is fixed, and the workability in changing the attachment location is good.

  Further, since the cable entrance 37C of the guide groove 37 is narrowed, the cable 10 inserted into the guide groove 37 is difficult to come out to the outside.

  Moreover, since the cable lead-out portions having different directions for guiding the cables (the guide grooves 37 and the respective groove portions 36) are provided at a plurality of locations, the degree of freedom in routing the cable 10 is increased.

  Further, even when the guide groove 37 extends obliquely with respect to the mold opening direction of the pair of molds for forming the fixture 20, the pair of groove walls 37 </ b> A and 37 </ b> B constituting the guide groove 37. Since the mold opening direction is opened, the guide groove 37 can be formed by the pair of molds. Therefore, the manufacturing cost can be reduced as compared with the case where the guide groove is separately formed.

  Further, fixing means (the screw 13, the screw hole portion 14, and the screw insertion hole 23) for fixing the pressure sensor 1 and the fixture 20 are arranged symmetrically around the axis centering on the introduction port 7, and the pressure The sensor 1 can be fixed to the fixture 20 in a plurality of fixed postures around the axis. Thereby, it becomes possible to freely select the mounting direction of the pressure sensor 1 and the drawing direction of the cable 10.

Front view of the pressure sensor of the present invention Rear view of pressure sensor Perspective view of fixture Front view of fixture Rear view of the fixture Side view of the fixture Bottom view of fixture AA line sectional view of FIG. Side view showing an example of pressure sensor installation Front view showing an example of multiple pressure sensors mounted in parallel

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Pressure sensor 2 ... Casing 3 ... Detection means 7 ... Introduction port 9 ... Connector for cable connection (connector fitting part)
DESCRIPTION OF SYMBOLS 10 ... Cable 11 ... Connector part 12 ... Lock part 20 ... Fixture 21 ... Sensor support part 21A ... Accommodating part (opening part)
25 ... Wall surface fixing part 32 ... Fluid introduction path 33 ... Tube 35 ... Release operation hole (opening part)
36 ... Groove (cable lead-out part)
37 ... Guide groove (cable outlet)
37A, 37B ... groove wall 37C ... cable entrance W ... wall surface

Claims (7)

A structure for attaching a pressure sensor to a wall surface via a fixture,
The pressure sensor is
A casing,
A cable derived from the back of the casing;
An introduction port provided on the back surface of the casing for introducing fluid;
Detection means for detecting the pressure of the fluid provided in the casing and introduced by the introduction port;
With
The fixture is
A wall surface fixing part for fixing the fixture to the wall surface;
A sensor support that is fixed to the rear surface of the casing and supports the casing at a position spaced from the wall surface;
A fluid introduction path that is connected to the introduction port and introduces the fluid from the outside in the lateral direction of the sensor support portion to the introduction port;
A housing portion for housing the cable provided in the sensor support portion and led out from the casing;
A cable lead-out portion that is provided in a lateral direction of the sensor support portion and guides the cable from the housing portion to the outside;
A pressure sensor mounting structure characterized by comprising: A connector portion is provided at the end of the cable,
On the back surface of the casing, a connector fitting portion capable of fitting and connecting the connector portion is provided,
The connector portion includes a lock portion that can be fitted to the connector fitting portion and can be operated to release the fitting,
2. The pressure sensor mounting structure according to claim 1, wherein the fixture includes an opening portion that opens a rear portion of the connector portion and can be operated to be released from the outside of the fixture of the lock portion. The cable lead-out portion has a groove shape, a cable entrance for allowing the cable to enter from the radial direction, and the width dimension of the cable entrance is smaller than the inner width dimension. The pressure sensor mounting structure according to claim 1 or 2, wherein The pressure sensor according to any one of claims 1 to 3, wherein the cable lead-out portion is provided at a plurality of locations in which a direction in which the cable is led is different in a side surface direction of the sensor support portion. Mounting structure. The cable lead-out portion has a groove shape having a pair of opposed groove walls, extends in an oblique direction with respect to a mold opening direction of a pair of molds for forming the fixture, and the fixture The mounting structure for a pressure sensor according to any one of claims 1 to 4, wherein the groove opening direction of each groove wall is open. The back surface of the casing and the sensor support portion can be fixed in a plurality of different orientations of fixed postures around an axis centering on the introduction port, and the housing portion is configured to fix the cable in the fixed postures. 6. The pressure sensor mounting structure according to claim 1, wherein the pressure sensor mounting structure has a shape capable of being guided to a position corresponding to the cable lead-out portion. The fixture used for the attachment structure of the pressure sensor in any one of Claims 1-6.

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