JP4528503B2 - Vortex flow meter - Google Patents

Description

The present invention relates to a vortex flowmeter, more particularly, it relates to a vortex flowmeter box type.

A vortex flow meter called a Karman vortex flow sensor has a tube flow path that measures flow in a rectangular resin molded case, and the tube flow path has a vortex generator and a vortex detector. There is a box type thing. The vortex flowmeter is mounted by passing a screw through a screw hole of a mounting flange formed on both sides of the outer wall of the case and screwing the mounting flange (for example, Patent Document 1). .
JP 2001-74525 A

  In the conventional vortex flowmeter, as shown in FIG. 10, the mounting flange portion 100 is an L-shaped protruding piece with respect to the case outer wall 101, so that the bending moment in the direction indicated by the arrow M in FIG. There is a possibility that the strength (bending rigidity) is low, a repeated bending stress is received by vibration, and the base portion 100A is cracked by fatigue. In addition to this, there is a problem that screwing at the mounting flange portion 100 is liable to loosen due to vibration.

The present invention has been made in order to solve the above-mentioned problems, and it is possible to rationally increase the bending rigidity of the mounting piece, and to prevent the vortex of the mounting structure from causing cracks and loosening of screws by fatigue. The purpose is to provide a flow meter .

  In order to achieve the above object, a vortex flowmeter according to the present invention has a rectangular flow passage formed with a pipe flow path for measuring flow, and the pipe flow path includes a vortex generator and a vortex detector. In the vortex flow meter in which the tube portion for inlet side connection and the tube portion for outlet side connection are integrally formed on both sides of the case, the lower bottom surface of the case is a mounting surface for the vortex flow meter, There are mounting ear pieces projecting from the side wall of the case in the same direction as the tube portion extending at a plurality of locations on the lower bottom side of the case, and screw holes are formed in the mounting ear pieces. In addition, a reinforcing standing wall portion that connects the outer peripheral portion of the tube portion and the mounting ear piece portion and is continuous with the case side wall is integrally formed.

  Further, a screw loosening prevention shape portion may be formed around the screw through hole of the mounting ear piece portion.

  According to the vortex flowmeter of the present invention, the reinforcing standing wall portion is not a standing wall (rib) in a direction perpendicular to the case side wall, and the bending rigidity of the mounting ear piece portion is dramatically improved by the reinforcing standing wall portion. The mounting ear piece does not crack due to fatigue and does not loosen with screws. At the same time, the reinforcing vertical wall portion also reinforces the tube portion base.

  The screw locking shape portion may be a projection-like shape, and the screw locking prevention is performed by elastically deforming the screw locking shape portion in the compression direction as the screw is tightened.

  Embodiments of the present invention will be described below in detail with reference to the accompanying drawings.

  1 to 7 show one embodiment of a vortex flowmeter according to the present invention.

  As shown in FIG. 1, the vortex flowmeter has a rectangular parallelepiped case 11 made of a resin molded product. The case 11 includes a box-shaped case main body 12 and a cover 23.

  A tube portion 13 for inlet side connection and a tube portion 14 for outlet side connection are integrally formed on both sides of the case body 12 with a fluororesin or the like.

  As shown in FIG. 4, a tube flow path 15 for measuring a flow rate is formed in the case body 12. One side (left side in the figure) of the pipe flow path 15 communicates with the inner diameter passage 16 of the tube part 13 for inlet side connection, and the other side (right side in the figure) shows the inner diameter of the tube part 14 for outlet side connection. It communicates with the passage 17.

  A positioning fitting portion 18 is formed in the case body 12. A detector holding block 19 is fitted to the positioning fitting portion 18. A columnar vortex generator 20 and a vortex detector 21 are integrally formed in the detector holding block 19.

  The vortex generator 20 extends across the partition wall 15 in the vertical direction. The vortex detector 21 is located in the pipe flow path 15 on the downstream side of the vortex generator 20 and incorporates a vortex detector 22. The vortex detector 22 is constituted by a pressure / electric conversion element (piezoelectric element) or the like, and the vortex in the tube flow path 15 is located at a position downstream of the vortex generator 20 as viewed in the flow of the fluid flowing in the tube flow path 15. Detection is performed and an electric signal corresponding to the vortex detection value is output.

  A cover 23 is attached to the upper side of the case main body 12, and an electric box chamber 24 is defined inside. The electrical box chamber 24 is provided with electrical parts 25 for measuring instruments, wirings 26 and the like.

  The lower bottom surface of the case 11, that is, the lower bottom surface 12 </ b> A of the case body 12 is a mounting surface for the vortex flowmeter. At the four corners on the lower bottom surface 12A side of the case main body 12, as shown in FIG. 2, in the same direction as the tube portions 13 and 14 extending from the case side walls 12B and 12C, as shown in FIG. 31, 32, 33, and 34 are integrally projected. The lower bottom surfaces 31A, 32A, 33A, 34A of the mounting ear pieces 31, 32, 33, 34 that are well shown in FIGS. 3 and 4 are flush with the lower bottom surface 12A of the case body 12 (same surface). It has become.

  As shown in FIG. 2, screw through holes 35, 36, 37, and 38 are formed through the mounting ear pieces 31, 32, 33, and 34, respectively. The screw through holes 35, 36, 37, and 38 are elongated holes so that the attachment position can be finely adjusted. Around each of the screw holes 35, 36, 37, and 38, a screw loosening prevention shape portion 39 by a protrusion is formed by protrusion (see FIG. 3).

  As shown in FIG. 2, the inlet side connecting tube portion 13 and the outlet side connecting tube portion 14 projecting from the case side walls 12B and 12C are slightly larger than the tube portions 13 and 14, respectively. Large diameter portions 13A and 14A having a diameter are formed.

  As shown in FIG. 5, between the outer peripheral portion of the large-diameter portion 13A of the tube portion 13 for connection on the inlet side and the inner sides of the mounting ear piece portions 31 and 32, the reinforcement for connecting the two is provided. The standing wall portions 41 and 42 are integrally formed. The reinforcing standing wall portions 41 and 42 are vertical walls and are formed continuously with the mounting ear piece portions 31 and 32 which are horizontal pieces and the case side wall 12B which is a vertical wall so as to intersect at right angles. Has been.

  Thus, a box-shaped corner is formed by the mounting ear piece portion 31, the case side wall 12B, and the reinforcing upright wall portion 41, and a box-shaped corner is formed by the mounting ear piece portion 32, the case side wall 12B, and the reinforcing upright wall portion 42. The

  Further, as shown in FIG. 1, between the outer peripheral portion of the large-diameter portion 14A of the tube portion 14 for outlet side connection and the inner sides of the mounting ear piece portions 33 and 34, both are connected. Reinforcing reinforcing wall portions 43 and 44 are integrally formed. The reinforcing standing wall portions 43 and 44 are also vertical walls like the reinforcing standing wall portions 41 and 42, and intersect the mounting ear piece portions 33 and 34 that are horizontal pieces and the case side wall 12C that is a vertical wall at right angles. Thus, it is formed continuously with these.

  Thus, a box-shaped corner is formed by the mounting ear piece 33, the case side wall 12C, and the reinforcing standing wall 43, and a box-shaped corner is formed by the mounting ear piece 34, the case side wall 12C, and the reinforcing standing wall 44. The

  As described above, the reinforcing standing wall portions 41 to 44 are standing walls (ribs) in a direction intersecting with the case side wall 12B or 12C at right angles, and the reinforcing standing wall portions 41 to 44 provide mounting ear pieces. The bending rigidity of 31 to 34 is dramatically improved.

  Thereby, the crack by fatigue does not arise in the ear piece parts 31-34 for attachment also in long-term use. In addition, the reinforcing standing wall portions 41 to 44 simultaneously reinforce the base portions of the tube portions 13 and 14 in cooperation with the large diameter portions 13A and 14A of the tube portions 13 and 14. Thereby, even if the axial length of the tube parts 13 and 14 is lengthened, sufficient strength can be maintained.

  Further, the screwing performed through the screws 49 (see FIG. 7) through the screw through holes 35 to 38 of the mounting ear pieces 31 to 34 is not loosened. With regard to this locking, a further locking function can be obtained by elastically deforming the screw locking shape portion 39 in the compression direction with screw tightening. As a result, the vortex flowmeter does not rattle due to vibration or impact, and the vortex flowmeter is prevented from outputting an erroneous signal due to vibration or impact. Also, the spring washer can be omitted.

  FIG. 7 shows an attached state of the vortex flowmeter. In FIG. 7, 51 is an inlet side joint for connecting the inlet side connecting tube portion 13 and the inlet side piping 53, 52 is an outlet side joint for connecting the outlet side connecting tube portion 14 and the outlet side piping 54. is there.

  The vortex flowmeter is screwed by passing the screw 49 through the screw holes 35 to 38 of the mounting ear pieces 31 to 34 and engaging the screw 49 with the mounting plate 55.

  In addition, after this screwing, the space | interval A of the upper surface of the mounting ear piece parts 31-34 and a tube center is the inlet side joint 51, outlet side so that piping connection operation | work by the inlet side joint 51 and the outlet side joint 52 can be performed. A value larger than the nut outer diameter (radius) B of the joint 52 is set.

  8 and 9 show one embodiment of a vortex flowmeter mounting structure according to the present invention. 8 and 9, parts corresponding to those in FIGS. 1 to 7 are denoted by the same reference numerals as those in FIGS. 1 to 7, and description thereof is omitted.

  As shown in FIG. 8, the case main body 62 is formed with two engaging recesses 63 for click engagement on the front and back surfaces (only two on the front side are shown in FIG. 8). . The case main body 62 has the same configuration as that of the first embodiment described above except that there is an engagement recess 63 and there is no mounting ear piece portion or reinforcing standing wall portion.

  In the mounting structure of this embodiment, a mounting base 64 that is screwed to the mounting location of the vortex flowmeter is used. Screw holes 65 are formed through the four corners of the mounting base 64 for screwing. On the mounting base 64, check claws 66 for click engagement are formed at four positions, front, rear, left and right.

  The case 11 is fixedly connected to the mounting base 64 by clicking engagement of the check claw 66 of the mounting base 64 with the engaging recess 63 of the case main body 62.

  The mounting base 64 is screwed by passing the screw 49 through the screw hole 65 and engaging the screw 49 with the mounting plate 55 in a state where the case 11 is not attached. Thereafter, the case 11 can be attached to the mounting base 64 by one click by the above-described click engagement.

  In this embodiment, the screwing of the mounting base 64 and the pipe connection work for the vortex flowmeter can be performed separately. Thereby, the workability of attaching the vortex flowmeter and connecting the pipe to the vortex flowmeter is remarkably improved.

It is a perspective view which shows one Embodiment of the vortex flowmeter by this invention. It is a top view which shows one embodiment of the vortex flowmeter by this invention. It is a front view which shows one Embodiment of the vortex flowmeter by this invention. It is sectional drawing which shows one Embodiment of the vortex flowmeter by this invention. It is a side view which shows one embodiment of the vortex flowmeter by this invention. It is an enlarged view of the A section of FIG. It is a front view which shows the attachment state of the vortex flowmeter by this invention. It is a disassembled perspective view which shows one Embodiment of the attachment structure of the vortex flowmeter by this invention. It is a front view which shows one Embodiment of the attachment structure of the vortex flowmeter by this invention. It is sectional drawing which shows the attachment piece part of the conventional vortex flowmeter.

Explanation of symbols

DESCRIPTION OF SYMBOLS 11 Case 12 Case main body 13 Tube part for inlet side connection 14 Tube part for outlet side connection 15 Pipe flow path 20 Vortex generator 21 Vortex detector 22 Vortex detector 23 Cover 31, 32, 33, 34 Ear piece for attachment Part 35, 36, 37, 38 Screw through hole 39 Screw loosening prevention shaped part 41, 42, 43, 44 Reinforced vertical wall part 49 Screw 55 Mounting plate 62 Case body 63 Engaging recess 64 Mounting base 65 Screw through hole 66 Check claw

Claims (2)

A tube flow path for measuring flow rate is formed in a rectangular case, and the tube flow path has a vortex generator and a vortex detector, and a tube portion for inlet side connection and an outlet side connection on both sides of the case In the vortex flowmeter integrally formed with the tube part for
The lower bottom surface of the case is a mounting surface of the vortex flowmeter, and the mounting ears are formed to project from the side wall of the case in the same direction as the extending direction of the tube portion at a plurality of locations on the lower bottom surface side of the case A threaded hole is formed in the mounting ear piece,
A reinforcing standing wall portion that connects the outer peripheral portion of the tube portion and the mounting ear piece portion and is continuous with the case side wall is integrally formed.
Vortex flowmeter characterized by that.   2. The vortex flowmeter according to claim 1, wherein a screw looseness-preventing portion is formed around the screw hole of the mounting ear piece.

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