JP2009287966A - Assembling method of flowmeter, and flowmeter - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an assembling method of a flowmeter, enabling improvements in assembling work efficiency and reducing the cost. <P>SOLUTION: This assembling method of the flowmeter includes a first process of fixing a measurement channel housing 61 and a fluid inflow channel box 71 to a lid body 56 with attaching screws 67, 80 and 81; a second process of engaging a case body 51 with the measurement channel housing 61 and the fluid inflow channel box 71 so as to cover the measurement channel housing 61 and the fluid inflow channel box 71; a third process of reversing the measurement channel housing 61 and the fluid inflow channel box 71 with the case body 51; and a fourth process of fixing the lid body 56 to the case body 51 by using an attaching screw 60. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a flow meter assembling method and a flow meter including, for example, an ultrasonic transducer, a thermal flow meter, and the like as a flow measurement sensor.

  Membrane gas meters are the mainstream flow meter for general households, but in recent years, ultrasonic gas meters that detect changes in the propagation time of ultrasonic waves using ultrasonic sensors and measure gas flow rates, flow using flow sensors. Gas meters, thermal flow meters, etc. are known. These flow meters incorporate a shut-off valve that shuts off in an emergency such as an earthquake, and a pressure sensor that detects a pressure fluctuation such as gas leakage and outputs a signal that shuts off the shut-off valve at an abnormal pressure.

  In an ultrasonic gas meter, for example, as shown in Patent Document 1, a measurement channel body divided into a plurality of laminar flow passages is provided in a measurement unit in which one end side communicates with a gas inlet and the other end side communicates with a gas outlet. An ultrasonic sensor for measuring the flow velocity of the fluid flowing through the laminar flow passage is provided in the measurement channel body.

  FIG. 8 shows an exploded view of a conventional ultrasonic gas meter. The case body 11 has a rectangular box shape formed by aluminum die-casting or the like, and a gas inlet 12 is provided on one side of the upper wall and a gas inlet 12 is provided on the other side. Is provided with a gas outlet 13. The case body 11 is provided with a lower opening 14 and a front opening 15. The lower opening 14 is closed by a lid 16 and the front opening 15 is closed by a front panel (not shown) having a display unit.

  An inflow side connecting tube 17 that communicates with the gas inlet 12 and an outflow side connecting tube 18 that communicates with the gas outlet 13 are integrally provided on the lower surface of the upper wall of the case body 11. Projecting downward from the upper wall. Furthermore, screw holes 19 are formed in the four corners of the opening edge of the lower opening 14 of the case body 11 from below to above.

  The lid body 16 has a rectangular plate shape and also serves as a lid portion that closes the upper opening portion 21 of the measurement channel housing 20, and has an inlet portion 16a at one end portion and an outlet portion 16b at the other end portion. Is provided. The measurement channel housing 20 has a rectangular box shape having a bottom portion, and a stepped portion 21 a that fits the lid body 16 is formed on the inner peripheral edge of the upper opening 21. A rectifying tube 22 forming a measurement flow path is accommodated in the measurement flow path housing 20. The rectifying tube 22 has a rectangular rectangular tube shape, and is provided with an inlet 23 at one end and an outlet 24 at the other end. Opening windows 25 (only one is shown) are provided on both sides of the rectifying pipe 22, and these opening windows 25 face an ultrasonic sensor (not shown) installed at an angle with respect to the gas flow. It has become. The ultrasonic sensor is attached to the inside of a sensor attachment lid 26 provided on the side wall portion of the measurement channel housing 20.

  Further, screw insertion holes 27 penetrating in the vertical direction are formed in the four corners of the measurement channel housing 20. Four attachment screws 28 are inserted into the screw insertion hole 27 from below the measurement flow path housing 20 and are screwed into the screw holes 19 of the case body 11.

  A fluid inflow path box 30 is provided between the upper portion of the lid body 16 and the inflow side connecting cylinder 17 of the case body 11. The fluid inflow path box 30 is formed by aluminum die casting or the like, has a substantially rectangular box shape, and has an inflow path 31 penetrating in the vertical direction inside. A connection cylinder part 32 is provided at the upper part of the fluid inflow path box 30 as a square cylinder-shaped upstream connection part communicating with the inflow path 31. The connecting cylinder part 32 is provided with a flange part 33, and a ring member 34 made of rubber packing is fitted into the connecting cylinder part 32 so as to be airtight with the inflow side connecting cylinder 17 communicating with the gas inlet 12 of the case body 11. Connected.

  A shutoff valve 35 that shuts off the inflow passage 31 and a pressure sensor 36 that detects a gas pressure downstream of the shutoff valve 35 are mounted on the side wall of the fluid inflow path box 30.

  The ultrasonic gas meter configured as described above is assembled as follows.

  First, the rectifying tube 22 is accommodated from the upper opening 21 of the measurement flow path housing 20, and the upper opening 21 is closed by the lid 16. Next, the fluid inflow path box 30 is placed on the upper surface of the lid body 16, and the fluid inflow path box 30 is positioned at the inflow port portion 16a. Further, the ring member 34 is fitted into the connection cylinder portion 32 of the fluid inflow path box 30.

  Next, the lower opening 14 of the case main body 11 is positioned in the upper opening 21 of the measurement flow path housing 20, and the fluid inflow path box 30 is enclosed by the case main body 11 to connect the connecting cylinder 32 of the fluid inflow path box 30. The inflow side connecting cylinder 17 of the case body 11 is positioned.

In this state, the entire case main body 11 including the fluid inflow path box 30 and the measurement flow path housing 20 including the lid body 16 are reversed, and the gas inlet 12 and the gas outlet 13 of the case main body 11 are placed on the upper surface of the work table. Installed so that the bottom of the measurement channel housing 20 faces upward. When the mounting screw 28 is inserted into each screw insertion hole 27 and the mounting screw 28 is screwed and fixed into the screw hole 19 of the case main body 11, the lid body 16 and the fluid are interposed between the case main body 11 and the measurement flow path housing 20. The inflow path box 30 is clamped and fixed to complete the assembly.
JP 2004-264064 A

  However, in the ultrasonic gas meter described above, the fluid inflow path box 30 is not fixed in a state of being placed on the upper surface of the lid body 16, so that the fluid inflow path box 30 is movable in the lateral direction on the upper surface of the lid body 16. It is. Therefore, when the case main body 11 and the measurement flow path housing 20 are reversed and the mounting screw 28 is tightened, the fluid inflow path box 30 is laterally grazed on the upper surface of the lid body 16, and the case main body 11 and the measurement flow path There is a problem that the assembly workability for fixing the road housing 20 is poor.

  The present invention has been made paying attention to the above circumstances, and an object of the present invention is to provide a flow meter assembling method and a flow meter capable of improving the assembly workability and reducing the cost. is there.

In order to achieve the above object, the present invention provides a case main body having a gas inlet and a gas outlet and having a lower opening, a measurement flow path housing having a flow rate sensor, An inflow path for inflowing gas from the gas inflow passage into the measurement flow path housing and a fluid inflow path box for inflowing gas out of the lower opening to the measurement flow path housing, and a lower opening of the case body are closed. And a method of assembling a flow meter for measuring the flow rate of gas flowing through the measurement flow path housing, comprising a lid for fixing the measurement flow path housing and the fluid inflow path box,
A first step of fixing the measurement flow path housing and the fluid inflow path box to the lid with a mounting screw; and the case main body to enclose the measurement flow path housing and the fluid inflow path box. A second step of fitting the measurement flow path housing and the fluid inflow path box; a third step of inverting the measurement flow path housing and the fluid inflow path box together with the case body; and the lid. A flow meter assembling method comprising a fourth step of fixing to the case body with a mounting screw.

According to a second aspect of the present invention, a case main body having a gas inlet and a gas outlet and having a lower opening, a measurement channel housing having a flow rate measurement sensor, and a gas flowing in from the gas inlet are provided in the measurement channel. An outflow passage through which gas flowing out from the connecting tube portion and the lower opening forming the inflow passage flowing into the housing flows into the measurement flow channel housing and outflows from the measurement flow channel housing to the gas outlet A fluid inflow path box provided with a connection cylinder part forming a cover, a lower opening of the case body, a lid for fixing the measurement channel housing and the fluid inflow path box, and a connection cylinder part A method of assembling a flow meter for measuring a gas flow rate flowing through the measurement flow path housing, comprising a seal member to be fitted,
A first step of fixing the measurement flow path housing and the fluid inflow path box to the lid with a mounting screw; a second step of fitting a seal member to the connecting cylinder; and the measurement flow path The case body is fitted to the measurement flow path housing and the fluid inlet path box so as to enclose the housing and the fluid inlet path box, and the seal member is interposed between the inner surface of the case body. A step of reversing the measurement channel housing and the fluid inflow channel box together with the case main body, and fixing the lid body to the case main body with a mounting screw, compressing the seal member, and airtight A flow meter assembling method comprising the fifth step of sealing.

  According to a third aspect of the present invention, the case main body having a gas inlet and a gas outlet at the upper part, a lower body opening, a measurement flow path housing having a flow rate sensor, and the gas flowing in from the gas inlet are measured. The gas that flows out from the connecting tube part and the lower opening that forms the inflow passage that flows into the flow path housing flows into the measurement flow path housing, and the gas that flows out from the measurement flow path housing flows out to the gas outlet A fluid inflow path box having a connection cylinder part forming a passage; a lid for closing the lower opening of the case body; and fixing the measurement channel housing and the fluid inflow path box; and the connection cylinder part And a sealing member that hermetically seals the fluid inflow path box and the case main body.

  A fourth aspect of the present invention is characterized in that the flow rate measuring sensor of the third aspect is an ultrasonic transducer.

  A fifth aspect of the present invention is characterized in that the flow rate measuring sensor of the third aspect is a thermal flow rate measuring device.

  According to the present invention, since the measurement flow path housing and the fluid inflow path box are fixed in advance to the lid, the fluid inflow path box does not wobble in the lateral direction even if it is inverted together with the case body. Workability can be improved and costs can be reduced. Further, by previously fitting the seal member to the connecting tube portion, the seal member is compressed simultaneously with the assembly of the case main body, so that the seal can be surely performed and the reliability is high.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

  1 to 7 show a first embodiment of an ultrasonic gas meter as a flow meter, and FIGS. 1 and 2 are exploded perspective views of the ultrasonic gas meter.

  As shown in FIGS. 1 and 2, the case main body 51 has a rectangular box shape formed by aluminum die casting or the like, and a gas inlet 52 is provided on one side of the upper wall, and a gas outlet is provided on the other side. 53 is provided. The case body 51 is provided with a lower opening 54 and a front opening 55. A plurality of screw holes 54a and 55a are formed in the opening edges of the lower opening 54 and the front opening 55, the lower opening 54 is closed by a lid 56, and the front opening 55 has a display unit. It is blocked by a front panel (not shown).

  An inflow side connection tube 57 that communicates with the gas inflow port 52 and an outflow side connection tube 58 that communicates with the gas outflow port 53 are integrally provided on the lower surface of the upper wall of the case body 51. Projecting downward from the upper wall.

  The lid body 56 has a rectangular plate shape, and a stepped portion 59 is provided on the lower surface at the four corners. A mounting hole 56a is formed in the stepped portion 59 corresponding to the screw hole 54a of the lower opening 54. . A mounting screw 60 is inserted into the mounting holes 56a from below the lid body 56 and is screwed into the mounting holes 56a. Further, a total of six screw holes 56 b are formed at the four corners and the middle of the lid 56.

  A measurement flow path housing 61 is provided on the top of the lid 56. As shown in FIGS. 3 and 7, the measurement flow path housing 61 is formed by aluminum die casting or the like, and a gas inflow portion 64 is provided at one end portion of the main body portion 63 covering the cylindrical portion of the rectifying pipe 62. A gas outlet 65 is provided at the other end.

  An attachment hole 66 is provided on the outer peripheral edge of the measurement flow path housing 61 so as to face the screw hole 56 b of the lid 56. A mounting screw 67 is inserted through these mounting holes 66 and is screwed into a screw hole 56 b of the lid 56. Therefore, the rectifying pipe 62 is fixed to the lid 56 at the same time as the measurement flow path housing 61 is fixed to the lid 56. Further, an ultrasonic sensor mounting portion 69 is provided in the main body portion 63 of the measurement flow path housing 61 so as to face the opening window 68 of the rectifying pipe 62.

  The gas inflow portion 64 of the measurement channel housing 61 has a substantially rectangular shape, and an attachment hole 64a and a screw hole 64b are formed in the opening edge portion in the vertical direction. The gas outflow part 65 of the measurement flow path housing 61 is cylindrical, and a cylindrical connection cylinder part 70 having a flange part 70a is provided at the upper part. The connecting tube portion 70 is fitted and connected to an outflow side connecting tube 58 that communicates with the gas outlet 53 of the case body 51.

  A fluid inflow path box 71 is provided above the gas inflow portion 64 of the measurement flow path housing 61. The fluid inflow path box 71 is formed by aluminum die casting or the like, has a substantially rectangular box shape, and has an inflow path 72 penetrating in the vertical direction inside. A connection cylinder portion 73 having a flange portion 73 a communicating with the inflow passage 72 is provided at the upper portion of the fluid inflow passage box 71.

  Ring members 74 and 75 made of rubber packing are fitted into the connecting tube portion 70 on the gas outflow portion 65 side and the connecting tube portion 73 on the gas inflow portion 64 side, and the inflow side connecting tube 57 and the outflow side connection of the case body 51 are fitted. The cylinder 58 is connected in an airtight manner. A shutoff valve 76 that shuts off the inflow passage 72 and a pressure sensor 77 that detects a gas pressure downstream of the shutoff valve 76 are mounted on the side wall of the fluid inflow path box 71. The pressure sensor 77 is not limited to being provided on the downstream side of the shutoff valve 76, and may be provided on the upstream side of the shutoff valve 76.

  Attachment edges 78 are integrally provided on both sides of the fluid inflow path box 71, and attachment holes 79 are provided in the attachment edges 78 corresponding to the attachment holes 64 a and the screw holes 64 b of the measurement flow path housing 61. Yes. A long shaft mounting screw 80 that passes through the mounting hole 64a and is tightened to the screw hole 56b and a short shaft mounting screw 81 that is tightened to the screw hole 64b are inserted into the mounting hole 79. The fluid inflow path box 71 can be attached to the measurement flow path housing 61 and the fluid inflow path box 71 can be attached to the lid 56 via the measurement flow path housing 61.

  Next, a method for assembling the ultrasonic gas meter configured as described above will be described.

  First, the rectifying tube 22 is housed inside the measurement channel housing 61, and the measurement channel housing 61 is placed on the upper surface of the lid 56. Four attachment screws 67 are inserted into the attachment holes 66 of the measurement flow path housing 61, and are fastened and fixed to the screw holes 56 b of the lid body 56.

  Next, the fluid inflow path box 71 is placed and positioned in the gas inflow portion 64 of the measurement flow path housing 61, and two mounting screws 81 are inserted into the mounting holes 79, and the screw holes 64 b of the measurement flow path housing 61 are inserted. Tighten and fix to. Further, two mounting screws 80 are inserted into the mounting holes 79, and the mounting screws 80 are passed through the mounting holes 64a to be fastened and fixed to the screw holes 56b of the lid 56.

  As a result, the measurement flow path housing 61 and the fluid inflow path box 71 are fixed and integrated with the lid 56. Next, ring members 74 and 75 made of rubber packing are fitted into the connecting cylinder portions 70 and 73 of the fluid inflow path box 71, so that the measurement flow path housing 61 and the fluid inflow path box 71 are contained above them. The case main body 51 is fitted.

  When the case main body 51 is fitted into the measurement flow path housing 61 and the fluid inflow path box 71, the ring members 74 and 75 of the connection cylinder portions 70 and 73 of the fluid inflow path box 71 are connected to the flange portions 70 a and 73 a and the inflow side connection cylinder 57. And it will be in the state interposed between outflow side connection pipes 58.

  Next, as shown in FIG. 4, together with the case main body 51, the measurement flow path housing 61 and the fluid inflow path box 71 fixed to the lid 56 are reversed, and the gas inlet 52 and the gas outlet 53 of the case main body 51 are reversed. Is placed on the upper surface of a work table or the like, and the lid 56 is placed on the top. Then, when the attachment screws 60 are inserted into the attachment holes of the lid body 56 and these attachment screws 60 are fastened and fixed to the screw holes 54 a of the case body 51, the measurement flow path housing 61 and the case body 51 and the lid body 56 are separated. The fluid inflow path box 71 is fixed in an enclosed state, and the assembly is completed.

  At this time, since the fluid inflow path box 71 is fixed to the lid body 56 together with the measurement flow path housing 61, the connection cylinder portions 70 and 73 of the fluid inflow path box 71 and the inflow side connection cylinder 57 of the case body 51 and Positioning with the outflow side connection cylinder 58 can be easily performed. Moreover, as shown in FIGS. 5 and 6, when the mounting screw 60 is fastened and fixed to the screw hole 54a of the case main body 51, the ring members 74 and 75 of the connecting cylinder portions 70 and 73 of the fluid inflow path box 71 are flange portions 70a. , 73a and the connecting cylinder portions 70, 73, the inflow side connecting cylinder 57 and the outflow side connecting cylinder 58 are connected in an airtight state.

  Furthermore, although the present invention has been described with respect to an ultrasonic gas meter, it can also be applied to a flow meter such as a flow gas meter using a flow sensor or a thermal flow meter using a thermocouple.

  Note that the present invention is not limited to the above-described embodiment as it is, and can be embodied by modifying constituent elements without departing from the scope of the invention in the implementation stage. Moreover, various inventions can be formed by appropriately combining a plurality of constituent elements disclosed in the embodiment. For example, some components may be deleted from all the components shown in the embodiment. Furthermore, you may combine the component covering different embodiment suitably.

1 is an exploded perspective view of an ultrasonic gas meter showing a first embodiment of the present invention. The exploded perspective view of the ultrasonic gas meter which shows the embodiment. The disassembled perspective view which partially showed the embodiment and showed the relationship between a measurement flow path housing and a rectification | straightening pipe. The exploded perspective view of the state which showed the embodiment and the ultrasonic gas meter was reversed. The front view of the assembly state of an ultrasonic gas meter which shows the embodiment. The perspective view of the assembly state of the ultrasonic gas meter which shows the embodiment. The perspective view of the assembly state which carried out the cross section partially which shows the same embodiment and shows the relationship between a measurement flow path housing and a rectifier. The disassembled perspective view which shows the assembly method of an ultrasonic gas meter.

Explanation of symbols

DESCRIPTION OF SYMBOLS 51 ... Case main body, 52 ... Gas inflow port, 53 ... Gas outflow port, 56 ... Cover body, 60 ... Mounting screw, 61 ... Measurement flow path housing, 71 ... Fluid inflow path box, 70, 73 ... Connection cylinder part, 74 75 ... Sealing member

Claims (5)

A case main body having a gas inlet and a gas outlet and having a lower opening, a measurement flow path housing having a flow rate measurement sensor, and an inflow for flowing a gas flowing in from the gas flow inlet into the measurement flow path housing A fluid inflow path box for flowing the gas flowing out from the passage and the lower opening into the measurement flow path housing, and a lower opening of the case body are closed, and the measurement flow path housing and the fluid inflow path box are fixed. A method of assembling a flow meter comprising a lid and measuring a gas flow rate flowing through the measurement flow path housing,
A first step of fixing the measurement flow path housing and the fluid inflow path box to the lid with a mounting screw;
A second step of fitting the case body to the measurement flow path housing and the fluid inflow path box so as to enclose the measurement flow path housing and the fluid inflow path box;
A third step of inverting the measurement flow path housing and the fluid inflow path box together with the case body;
A fourth step of fixing the lid to the case body with a mounting screw;
Assembling method of flowmeter consisting of A case main body having a gas inlet and a gas outlet and having a lower opening, a measurement flow path housing having a flow rate measurement sensor, and an inflow for flowing a gas flowing in from the gas flow inlet into the measurement flow path housing A connecting cylinder that forms an outflow passage through which the gas flowing out from the measurement flow path housing flows into the measurement flow path housing and flows out from the measurement flow path housing to the gas outflow port. A fluid inflow path box having a portion, a lower opening of the case body, a lid for fixing the measurement flow path housing and the fluid inflow path box, and a seal fitted to the connecting cylinder portion A method of assembling a flow meter for measuring a flow rate of gas flowing through the measurement flow path housing, comprising:
A first step of fixing the measurement flow path housing and the fluid inflow path box to the lid with a mounting screw;
A second step of fitting a sealing member into the connecting tube portion;
The case main body is fitted to the measurement flow path housing and the fluid inflow path box so as to enclose the measurement flow path housing and the fluid inflow path box, and the seal member is interposed between the inner surface of the case main body. A third step of
A fourth step of inverting the measurement flow path housing and the fluid inflow path box together with the case body;
A fifth step of fixing the lid to the case body with a mounting screw and compressing the seal member to hermetically seal;
Assembling method of flowmeter consisting of A case body having a gas inlet and a gas outlet at the top and having a lower opening,
A measurement flow path housing with a flow measurement sensor;
Gas flowing in from the gas inflow port flows into the measurement flow path housing, and gas flowing out from the connection tube portion and the lower opening forming an inflow passage for flowing into the measurement flow path housing. A fluid inflow path box provided with a connecting cylinder portion that forms an outflow passage for outflowing gas to the gas outlet;
A lid for closing the lower opening of the case body and fixing the measurement flow path housing and the fluid inflow path box;
A flow meter comprising: a sealing member fitted into the connection cylinder portion and hermetically sealing the fluid inflow path box and the case main body.   The flowmeter according to claim 3, wherein the flow measurement sensor is an ultrasonic transducer.   The flowmeter according to claim 3, wherein the flow measurement sensor is a thermal flow meter.

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