JP4330480B2 - Detector - Google Patents

Description

  The present invention relates to a detector in which a display unit that displays a physical quantity is attached to a printed board, the printed board is attached to a case, and a lid that covers the display unit is attached to the case.

Conventionally, detectors that measure physical quantities such as pressure, flow rate, and temperature of a fluid flowing through a pipe have been used. In this detector, a display unit for displaying the measured physical quantity is provided on the printed circuit board, the printed circuit board is attached to the case, and a lid that covers the display unit is attached to the case.
An electric wire is provided on the back surface of the printed circuit board, and the printed circuit board may be detachable from the case so that the user can attach the electric wire to the back surface of the printed circuit board.

In this type of detector, the display unit is usually directly screwed to the case, and the case is fixed to the pipe in such a posture that the display unit is easy to see.
However, since the attachment position and orientation are determined by the direction of the piping at the installation location, the display unit is difficult to see depending on the installation location.
Therefore, conventionally, a detector that can change the orientation of the display unit within the display plane regardless of the installation position and orientation of the pipe has been used.

Conventionally, there is a liquid level transmitter in which a display-attached cover is attached to a case with four screws, and the display posture can be changed every 90 degrees by changing the attachment position of the cover to the case ( Patent Document 1).
Further, the display unit is rotatably supported by the intermediate joint, and V-grooves are provided radially at predetermined angular intervals on the circumference around the rotation axis of the display unit on the surface of the locking unit of the display unit body. There is a detector in which a leaf spring having a tongue that can be engaged and disengaged in a V-groove is fixed to a rising portion of an intermediate joint and a display unit is held at predetermined angles (Patent Document 2).

Japanese Patent Laid-Open No. 8-43223 (paragraph numbers “0065” to “0067” (see FIGS. 5 and 10)) Japanese Patent Laid-Open No. 9-304212 (see paragraph number “0024” FIGS. 1 and 3)

In Patent Document 1, in order to position it has easy viewing the display device, the display device is required special tools or the like to change the mounting position with respect to the case of the cover which is integrated. In order to change the mounting position, the screw that has been screwed must be removed using a dedicated tool, and the orientation of the display must be changed and screwed again. In particular, the cover and the case must be sufficiently screwed in consideration of water intrusion into the apparatus. Such screw removal and installation work is time consuming and troublesome.
In Patent Document 2, since the moderation mechanism is configured by including a V groove provided in the display unit main body and a tongue piece formed on the leaf spring, the structure of the V groove and the tongue piece constituting the moderation mechanism is described. It is complicated and requires time and effort for these processes. Moreover, since the leaf spring is fixed to the rising portion of the intermediate joint, the intermediate joint has a complicated structure.

  An object of the present invention is to provide a detector having a simple structure and capable of easily changing the posture of a display unit.

Therefore, the detector of the present invention includes a display unit that displays a physical quantity, a printed circuit board to which the display unit is attached and electrically connected to the display unit, a holder that holds the printed circuit board, and the holder that is attached and detached. A case that can be freely attached, and a lid that is detachably attached to the case and covers the surface of the display unit, and the holder and the case can change the orientation of the display unit in the display plane. And an engaging portion that engages with the concave and convex portions , and the holder includes a flat plate portion that faces the printed circuit board, and a leg portion that is provided on the flat plate portion and engages with the printed circuit board. Comprises a claw portion formed in the holder, and a plurality of groove portions respectively formed along the depth direction of the case and arranged along the circumferential direction of the opening portion of the case, The groove engage, and wherein the elastically biased toward the groove, and the leg portion and the pawl portion is characterized Rukoto is integrally formed.

In the invention with the above configuration, the printed circuit board on which necessary wiring is provided is attached to the holder, and this holder is attached to the case together with the printed circuit board. At this time, the engaging portion of the holder and the engaging portion of the case are positioned so that the display portion attached to the printed circuit board is easy to see in relation to the installation portion such as a pipe to which the detector is attached. Engage with irregularities. When the holder is attached to the case, attach the lid to the case.
Therefore, in the present invention, when the printed circuit board is attached to the case, a holder is interposed, and the engaging portions provided on the holder and the case are attached with uneven engagement, so that a conventional dedicated tool is used. The troublesome screwing work which became necessary is unnecessary. In particular, since the holder is attached to the case before the lid is attached to the case, the waterproofing in the apparatus may be performed between the lid and the case, and the holder is attached to the case in consideration of waterproofing. There is no need to do it. Further, in the present invention, when the holder for holding the printed board is detachably attached to the case, the holder and the case have a structure having a locking portion that engages with each other. Since it is not necessary to employ a moderation mechanism with a special structure such as a groove or a tongue, the structure of the detector is simplified.

In addition, since the printed circuit board is locked by the legs , the printed circuit board can be held on the holder with a reliable and simple structure.

In addition, the engaging portion includes a claw portion formed in the holder, and a plurality of groove portions that are respectively formed along the depth direction of the case and arranged along the circumferential direction of the opening portion of the case. Since the claw portion is configured to engage with the groove portion, the holder can be attached to the case in a predetermined posture by pushing the holder into the case with the claw portion engaged with the specific groove portion. Therefore, since the engaging portion can have a simple configuration of the claw portion and the groove portion, the detector can be easily manufactured.

And since the nail | claw part is urged | biased by the groove part, even in the operation | work which a user (user) connects an electric wire to a printed circuit board, attaches a holder to a case, and adjusts a display part from the front of a holder Will not fall out of the case.

The holder preferably has a handle portion.
In the invention of this configuration, when the holder is attached to and detached from the case, the work can be performed while holding the handle portion. Therefore, since it is not necessary to have the printed board in the attaching and detaching work, dirt on the hand is mistakenly attached to the printed board. There is nothing.

It is preferable that a unit of physical quantity is displayed on the surface of the holder.
In the present invention, by displaying the unit of the physical quantity on the holder surface, the unit is displayed at a position close to the display unit, and the detection value can be easily read.

Hereinafter, an embodiment of the present invention will be described with reference to the drawings.
1 to 3 show the overall configuration of the detector of this embodiment.
FIG. 1 is a front view showing a detector, FIG. 2 is a sectional view of the detector, and FIG. 3 is an exploded perspective view of the detector.

  In these drawings, the detector of the present embodiment is a differential pressure gauge 1, which is a substantially cylindrical case 2 and a differential pressure element that is attached to the case 2 via a collar 3 and detects pressure. 4, a printed board 5, a display unit 6 attached to the surface of the printed board 5, a holder 7 that holds the printed board 5 and is detachably attached to the case 2, and a print that is detachably attached to the case 2 A lid 8 that fixes the substrate 5 and covers the surface of the display unit 6 is provided.

The case 2 is made of metal and includes a cable gland 2A on its peripheral surface. The tip of a cable (not shown) passing through the cable gland 2A is connected to the printed board 5 in the case 2. The end surface of the case 2 is a sandwiching portion 2Z that sandwiches and fixes the printed circuit board 5 with the lid 8.
The differential pressure element 4 includes a flange portion 4A, and the flange portion 4A is attached to the collar 3 and the case 2 with a bolt 9A. A spring washer 9B is interposed between the bolt 9A and the flange portion 4A.
The differential pressure element 4 includes a diaphragm (not shown) and the like, and detects the pressure value of the fluid flowing through a pipe (not shown) that is a measurement target.

The printed circuit board 5 is intended circuit for calculating the pressure values detected by the differential pressure element 4 is provided on the substantially disk-shaped plate portion 5A, the operation result is displayed on the display unit 6.
A plurality of switches 5B for operating the display unit 6 are provided on the plate unit 5A. The peripheral edge portion of the plate portion 5A can be brought into contact with the opening edge portion of the case 2 (see FIG. 8).
The display unit 6 is electrically connected to the printed circuit board 5 and displays the pressure value calculated by the printed circuit board 5 on a liquid crystal display.
The display unit 6 is formed in a flat rectangular thin plate shape, and is attached to the upper surface of the plate unit 5 </ b> A in parallel with the plane of the printed circuit board 5.

The holder 7 is made of an elastically deformable synthetic resin, and includes a substantially disc-shaped flat plate portion 7A that faces the printed circuit board 5 and leg portions 7B that are provided on the flat plate section 7A and engage the printed circuit board 5. ing. These parts may be integrally formed by injection molding or the like, or may be molded separately and joined by appropriate means such as adhesion and fitting.
On the flat plate portion 7A of the holder 7, a window portion 7C for exposing the display portion 6 is formed in a rectangular shape. Necessary information such as units of physical quantities (for example, kPa, m ³ / h, L / min, m ³ ) and manufacturer names (for example, ABC.CORP) at the upper and lower positions sandwiching the window 7C on the surface of the flat surface Is displayed (see FIG. 6). This display is performed by appropriate means such as printing.
A hole 7D through which the switch 5B is inserted is formed in the flat plate portion 7A of the holder 7. Thereby, even when the printed circuit board 5 is attached to the holder 7, the switch 5 </ b> B can be operated from above the holder 7.
An outer peripheral edge portion of the flat plate portion 7 </ b> A is a handle portion 7 </ b> E for holding the holder 7.

  The leg portions 7B are provided at four positions on the outer peripheral edge portion of the flat plate portion 7A at intervals of 90 degrees, and these leg portions 7B are respectively formed with locking projections 7F at substantially intermediate portions thereof (see FIG. 7). The locking protrusion 7 </ b> F is locked to the notch 5 </ b> C of the plate portion 5 </ b> A of the printed circuit board 5. The locking between the cutout portion 5C and the locking protrusion 7F is released by opening the tip portions of the four leg portions 7B. The plate portion 5A is substantially parallel to the flat plate portion 7A in a state where it is locked to the leg portion 7B.

The structure of the lid 8 is shown in FIG. In FIG. 4, a lid 8 includes a cap-shaped lid main body 10 having an opening, a glass plate 11 covering the opening of the lid main body 10, and C for mounting the glass plate 11 on the lid main body 10. A retaining ring 12 is provided, and O-rings 13 are provided between the glass plate 11 and the lid body 10 and on the opposite side of the C retaining ring 12 from the glass plate 11 for waterproofing.
A female screw is formed on the inner peripheral surface portion of the lid body 10, and a male screw that engages with the female screw is formed on the outer peripheral surface portion of the case 2. Therefore, the lid 8 can be screwed into the case 2 with the holder 7 holding the printed circuit board 5 attached to the case 2.
The lid main body 10 includes a sandwiching portion 10Z that sandwiches and fixes the printed circuit board 5 with the sandwiching portion 2Z of the case 2.

The case 2 and the holder 7 are respectively formed with engaging portions 2X and 7X that can change the posture of the display portion 6 in the display plane and engage with the concave and convex portions.
The detailed structures of these engaging portions 2X and 7X are shown in FIGS.
5 is a perspective view showing a state before the holder 7 is attached to the case 2, FIG. 6 is an exploded perspective view for explaining a state in which the posture of the holder 7 is changed, and FIG. FIG. 8 is a perspective view showing a state in which the holder 7 is attached to the case 2.

5 to 7, the engaging portion 2X on the case 2 side is formed of four groove portions formed at equal intervals of 90 degrees along the circumferential direction of the inner surface of the opening portion of the case 2, and these groove portions are formed in the case. 2 are formed substantially linearly along the depth direction. A protruding portion 2Y is gently formed in the middle of the groove portion which is the engaging portion 2X.
The engaging portion 7X on the holder 7 side is a claw portion that protrudes outward from the tip portion of the leg portion 7B, and this claw portion can be engaged with a groove portion that constitutes the engaging portion 2X. Since the holder 7 is formed of an elastic member, the engaging portion 7X is elastically biased toward the engaging portion 2X formed of a groove portion.

Since there are four nail portions every 90 degrees and four groove portions every 90 degrees, the printed circuit board 5 attached to the holder 7 changes the orientation of the display section 6 with respect to the case 2 every 90 degrees. It becomes possible to mount as possible (see FIG. 6).
When the holder 7 is pushed into the case 2 in a state where the display portion 6 is in a predetermined posture, as shown in FIG. 7A, the claw portion which is the engaging portion 7X on the holder 7 side becomes the engaging portion on the case 2 side. As shown in FIG. 7B, the claw portion tries to get over the protruding portion 2Y. At this time, the claw portion is elastically deformed inward. Further, as shown in FIG. 7C, when the claw portion climbs over the protruding portion 2Y, the elastically deformed claw portion returns to the original position.
When the holder 7 is finally pushed into the case 2, the printed circuit board 5 comes into contact with the outer periphery of the opening of the case 2 as shown in FIG. 8.

According to this embodiment as described above, there are the following effects.
(1) The printed circuit board 5 to which the display unit 6 is attached is held by a holder 7, the holder 7 is detachably attached to the case 2, and a lid 8 is detachably attached to the case 2. Further, since the engaging portions 2X and 7X that can change the posture of the display portion 6 in the display plane and engage with the concave and convex portions are formed, the holder 7 is interposed when the printed circuit board 5 is attached to the case 2. Since the engaging portions 2X and 7X provided in the holder 7 and the case 2 are attached by engaging with the concave and convex portions, a complicated screwing operation is not required. Therefore, an operation for changing the posture of the display unit 6 and attaching it to the case 2 can be easily performed. In addition, when the holder 7 that holds the printed circuit board 5 is detachably attached to the case 2, a structure is employed in which the holder 7 and the case 2 are provided with engaging portions 2 </ b> X and 7 </ b> X that engage with each other. Accordingly, since it is not necessary to employ a moderation mechanism having a special structure such as a V-groove or a tongue piece, the structure of the detector is simplified.

(2) Since the holder 7 includes the flat plate portion 7A facing the printed circuit board 5 and the leg portions 7B provided on the flat plate portion 7A and engaged with the printed circuit board 5, the printed circuit board 5 is locked by the leg portions 7B. Because of the structure, the printed circuit board 5 can be held on the holder 7 with a reliable and simple structure.

(3) The engaging portions 7 </ b> X and 2 </ b> X are claw portions formed on the holder 7 and a plurality of groove portions formed along the depth direction of the case 2 and arranged along the circumferential direction of the opening of the case 2. Since the claw portion is engaged with the groove portion, the holder 7 is pushed into the case 2 in a state where the claw portion is engaged with the specific groove portion, so that the holder 7 is brought into a predetermined posture. Can be attached to. Therefore, since the engaging portion can have a simple configuration of the claw portion and the groove portion, the holder 7 and the case 2 can be easily manufactured.

(4) Since the claw portion is elastically urged toward the groove portion, the claw portion is constantly urged toward the groove portion, so that the user connects an electric wire to the printed circuit board 5 and the holder 7 is attached to the case 2. The holder 7 does not fall out of the case 2 even in the work of mounting and adjusting the display unit 6 with the switch 5B. Therefore, wiring work etc. can be performed easily.

(5) Since the holder 7 has the handle portion 7E, the holder 7 can be operated with the handle portion 7E when the holder 7 is attached to or removed from the case 2. For this reason, it is not necessary to directly hold the printed circuit board 5 in the mounting / removing operation, so that dirt on the hands does not adhere to the printed circuit board 5 by mistake.
(6) Since the handle portion 7E is the outer peripheral edge portion of the flat plate portion 7A, the holder 7 can be easily gripped regardless of the orientation of the display portion 6, so that the mounting operation becomes easier.

(7) Since the unit of the physical quantity is displayed on the surface of the holder 7, the unit is displayed at a position close to the display unit 6, and the detection value can be easily read.
(8) In this embodiment, since the nail | claw part and groove part of the engaging part were each arrange | positioned at equal intervals, the attitude | position of the display part 6 can be changed every 90 degree | times.

(9) Since the protruding portion 2Y is formed in the middle of the groove portion that is the engaging portion 2X on the case 2 side, the holder 7 is difficult to come out of the case 2 by the claw portion getting over the protruding portion 2Y. Therefore, immediately after the holder 7 is attached to the case 2, the holder 7 is not accidentally dropped from the case 2.
(10) Since the lid 8 is attached to the case 2 by screwing, the lid 8 can be easily and quickly attached to and detached from the case 2 when the posture of the display unit 6 is changed.

Although the present invention has been described with reference to preferred embodiments, the present invention is not limited to the above-described embodiments, and modifications and the like within a scope that can achieve the object of the present invention are included in the present invention. It is.
For example, in the above embodiment, the engaging portions 2X and 7X are the four groove portions formed in the case 2 and the four claw portions respectively formed in the four leg portions 7B of the holder 7, These numbers are not limited to four, and may be two, three, five, six or more, for example. For example, if there are three, the distance between the legs 7B and the grooves may be 120 degrees. If the interval is 120 degrees, the orientation of the display unit 6 can be changed every 120 degrees. Further, the number of claw portions may be reduced with respect to the groove portion.

Furthermore, although the groove portion is linear, in the present invention, it may be spirally formed on the inner peripheral surface of the case 2. According to this, similarly to the lid 8, the holder 7 can be attached to the case 2 by screwing, and the orientation of the display unit 6 can be changed by adjusting the screwing amount of the holder 7 with respect to the case 2. .
In the present invention, the holder 7 may be formed from metal. In this case, it is preferable to apply a paint or the like for preventing leakage on the surface.
Furthermore, in the above-described embodiment, the detector is a differential pressure gauge. However, in the present invention, a device that detects a physical quantity, such as a thermometer, a flow meter, etc., and has a display unit may be of any type. Absent.

  The present invention can be used in the field of displaying various physical quantities such as pressure, temperature, and flow rate.

The front view which shows the detector concerning one Embodiment of this invention. Sectional drawing of the said detector. The exploded perspective view of the detector. The disassembled perspective view which shows the structure of a lid | cover. The perspective view which shows the state before a holder is attached to a case. The disassembled perspective view for demonstrating the state which changes the attitude | position of a holder. Sectional drawing which shows the state which mounts | wears a case with a holder. The perspective view which shows the state in which the holder was attached to the case.

Explanation of symbols

1 Differential pressure gauge (detector)
2 Case 2X Engagement part (groove part)
5 Printed Circuit Board 5C Notch 6 Display 7 Holder 7A Flat Plate 7B Leg 7E Handle 7F Locking Projection 7X Engagement (Claw)
8 lid

Claims (4)

A display unit for displaying a physical quantity, a printed circuit board to which the display unit is attached and electrically connected to the display unit, a holder for holding the printed circuit board, a case to which the holder is detachably attached, and the case A lid that is detachably attached to the display unit and covers the surface of the display unit, and the holder and the case can be engaged with each other so that the orientation of the display unit in the display plane can be changed and the projections and recesses can be engaged. Part is formed,
The holder includes a flat plate portion facing the printed board, and a leg portion provided on the flat plate portion and engaged with the printed board.
The engaging portion includes a claw portion formed in the holder, and a plurality of groove portions respectively formed along the depth direction of the case and arranged along the circumferential direction of the opening portion of the case, The claw portion engages with the groove portion and is elastically biased toward the groove portion;
The detector, wherein the leg portion and the claw portion are integrally formed . The detector of claim 1, wherein
The detector is characterized in that the groove is formed in a substantially linear shape along the depth direction of the case, and a protrusion that elastically deforms the claw is formed in the middle of the groove . The detector according to claim 1 , wherein the holder has a handle. The detector according to any one of claims 1 to 3 , wherein a unit of a physical quantity is displayed on the surface of the holder.

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