JPH0669746U - Flowmeter - Google Patents

Abstract

(57) [Abstract] [Object] The present invention aims to provide a flowmeter configured to enhance waterproofness of a lead wire storage portion that stores a communication lead wire that is communicatively connected to an external device. . [Structure] A measurement unit storage chamber 1c in which a measurement unit 2 for measuring the flow rate of city gas is stored in a case 1
And a lead wire storage chamber 22 are provided. The lead wire accommodating chamber 22 is provided at the center of the bottom portion 1a of the case 1 so as to prevent rainwater from entering, and connects the connecting portion 4 to which the upstream pipe 3 is connected and the connecting portion 6 to which the downstream pipe 5 is connected. It is provided so as to be located between them. The lid 44 is inserted into the opening 42 of the lead wire storage chamber 22, and the groove 4 is formed in the closing portion 44b.
Since 4c is provided, the connection portion 44d is easily disconnected when the closing portion 44b is pulled downward.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a flow meter, and more particularly, to an improvement of a flow meter having a lead wire storage portion that stores a communication lead wire that is connected to an external device so as to be communicable.

[0002]

[Prior art]

 Each home has a flow meter that measures the amount of city gas used. A flow meter of this type is, for example, a turbine type flow meter that detects the rotation of a turbine rotating at a rotation speed according to the flow rate of gas, or a fluid vibration type flow meter that vibrates a fluid using a fluidic element. Have been developed.

As shown in FIGS. 6 to 9, the flow meter has a box-shaped case 1 in which a measuring unit 2 for measuring a flow rate is housed, and a bottom portion 1 a of the case 1 is connected with an upstream pipe 3. The upstream side connecting part 4 and the downstream side connecting part 6 to which the downstream side pipe 5 is connected are provided. Further, the case 1 is provided with a measurement unit storage chamber 1c for storing the measurement unit 2 and a lead wire storage chamber 8 for storing a communication lead wire 7 communicatively connected to an external device. There is.

The communication lead wire 7 is inserted into a lead wire guide member 9 provided on a wall surface 8 a forming the lead wire storage chamber 8 and drawn into the lead wire storage chamber 8 to be stored in a folded state. To be done. The opening 8b of the lead wire storage chamber 8 is open to the side surface 1b of the case 1 and is closed by a flat plate-shaped lid 10. The lid 10 is locked by fitting a mounting hole 10a into a locking pin 11 with a collar fixed to the side surface 1b of the case 1. A packing 12 for preventing rainwater from entering the lead wire storage chamber 8 is interposed between the side surface 1b of the case 1 and the lid 10.

Normally, the lead wire storage chamber 8 is closed by a lid 10. However, when the lid 10 is pulled to the side during communication line connection, the attachment hole 10a of the lid 10 fitted to the locking pin 11 is engaged. The lid 10 is detached from the stop pin 11 and removed. Then, the communication lead wire 7 in the lead wire storage chamber 8 is pulled out of the case 1 and connected to a terminal device (not shown) or the like.

[0006]

[Problems to be solved by the device]

 However, in the flowmeter having the above configuration, the lead wire storage chamber 8 is provided so as to open to the side surface 1b of the case 1. Therefore, for example, when the flowmeter is installed near the wall by the piping position, the case 1 There is a problem that the side surface 1b of the device is too close to the wall and the lid 10 cannot be removed, and the communication lead wire 7 cannot be pulled out from the lead wire storage chamber 8 and connected to the terminal device.

Further, the packing 12 is interposed between the side surface 1b of the case 1 and the lid 10. However, for example, when the wind and rain are strong, the rain water may be sprayed directly on the side surface 1b of the case 1, It was difficult to completely waterproof the lead wire storage chamber 8. In addition, when the lid 10 is removed, the locking pin 11 may be deformed, and the lid 10 may not be mounted again.

Therefore, an object of the present invention is to provide a flow meter that solves the above problems.

[0009]

[Means for Solving the Problems]

 The invention of claim 1 is a flowmeter having a measuring unit housed in a case for measuring the flow rate of a fluid, and a lead wire connecting the measuring unit and an external device. A lead wire accommodating chamber for accommodating a lead wire is provided, and a lid for closing the lead wire accommodating chamber from the bottom side of the case is provided.

Further, in the invention of claim 2, the lid has a closing portion that closes an opening of the lead wire storage chamber, and an engaging portion that engages with the lead wire storage chamber, the closing portion Is provided in the closed portion to allow separation from the engaging portion by pulling downward.

[0011]

[Action]

 According to the present invention, a lead wire accommodating chamber for accommodating lead wires is provided at the bottom of the case, and the opening of the lead wire accommodating chamber is closed from the bottom side of the case, so that the lead wires can be pulled out regardless of the installation location. It is possible to prevent the rain from entering the lead wire storage chamber even when the wind and rain are strong.

Further, by providing the groove that allows the lid to be separated from the engaging portion, the closed portion of the lid can be easily taken.

[0013]

【Example】

 1 to 5 show an embodiment of a flow meter according to the present invention. In the figure, the same parts as those in FIGS. 6 to 9 described above are designated by the same reference numerals, and the description thereof will be omitted.

In each figure, a case 1 stores a measurement unit storage chamber 1c for storing a measurement unit 2 for measuring the flow rate of city gas and a communication lead wire 7 communicatively connected to an external device. And a lead wire storage chamber 22 are provided. The lead wire accommodating chamber 22 is provided in the center of the bottom portion 1a of the case 1 so that the communication lead wire 7 can be pulled out downward from the space between the upstream side connecting portion 4 and the downstream side connecting portion 6. ing.

The measurement unit 2 is a fluid vibration type measurement unit that vibrates a fluid using a fluidic element, as will be described later, and the case lid 1e on the back side of the case 1 is removed to remove the measurement unit storage chamber 1c. It is mounted inside and is mounted and fixed on the bottom 1a of the case 1.

As shown in FIG. 2, the measuring unit 2 includes an inflow passage 23 communicating with the upstream side connecting portion 4, a shutoff valve 24 for shutting off the inflow passage 23 in an emergency, and an inflow passage 23 having a preset pressure. When the value is reached, the pressure switch 25 is turned on and outputs the detection signal, a rectifying net 26 provided in the inflow path 23, and a flow rate measuring unit 27. The flow rate measuring unit 27 has a jet nozzle 28, a columnar target 29, first to fourth guide members 30 to 33, and a piezoelectric film sensor (not shown).

The measurement unit main body 2 a is provided with an inflow chamber 34 that communicates with the inflow passage 23 and an oscillation chamber 35 that communicates with the downstream side connecting portion 6. A jet nozzle 28 is provided between the inflow chamber 34 and the oscillation chamber 35. Therefore, the fluid (in this embodiment, city gas) flowing into the inflow chamber 34 from the inflow path 23 is accelerated by the ejection nozzle 28 to become the jet A and ejected to the oscillation chamber 35, which is caused by the columnar target 29 and the Coanda effect. After oscillating due to the action of the return flows B and C, it flows out from the outlet 36.

The position where the jet flow A passes when it oscillates in the left-right direction is a flow D in the left direction facing between the guide members 30 and 33 as fluid adhering walls, and a fluid-attached position as shown by the broken line in FIG. A rightward flow E is formed between the guide members 32 and 33 as the landing wall.

That is, the jet A from the jet nozzle 28 is deflected leftward or rightward in FIG. 2 to become the return flow B or the return flow C by the action of the columnar target 29 and the Coanda effect. The return flow B switches the direction of the jet A to the right, and the return flow C switches the direction of the jet A to the left. The vibration frequency of the jet A is proportional to the flow rate.

Pressure introduction holes 37 and 38 are formed below the flows D and E through which the jet flow A passes. The pressure introduced from the pressure introducing holes 37 and 38 is directly detected by a piezoelectric film sensor (not shown), and the vibration frequency is obtained from the output of this piezoelectric film sensor. Then, the flow rate display section 40 can be seen from the display window 39 provided on the front surface of the case 1, and the measured flow rate is displayed on the flow rate display section 40.

Although the measurement unit body 2a is formed in a box shape, since the lead wire storage chamber 22 described above is provided at the center of the bottom portion 1a of the case 1, the lead wire is provided at the center of the bottom portion of the measurement unit body 2a. An escape portion 2b is provided so as not to contact the storage chamber 22.

The lead wire storage chamber 22 is formed by an inverted U-shaped wall portion 41, and the opening 42 of the lead wire storage chamber 22 is provided so as to open to the bottom portion 1 a of the case 1. There is. Therefore, the interior of the case 1 is defined by the wall portion 41 into the measurement unit storage chamber 1c and the lead wire storage chamber 22.

Since the lead wire accommodating chamber 22 is provided in the bottom portion 1a of the case 1, rainwater does not easily enter the lead wire accommodating chamber 22 even when the wind and rain are strong, and the cover 44 made of rubber is used. Since the stopper 44a is fitted in the opening 42a of the lead wire storage chamber 22, it has a completely waterproof structure. As a result, the communication lead wire 7 can be prevented from being corroded or short-circuited by rainwater, and the reliability of the flowmeter is improved.

The communication lead wire 7 is connected to the measurement unit 2 at one end, and the other end is connected to a hollow lead wire guide member 43 attached to a hole 41 a formed in an upper portion of the wall portion 41. It is inserted and extends into the lead wire storage chamber 22.

As shown in FIG. 5, a lid 44 for closing the opening 42 a of the lead wire storage chamber 22 from below is formed of an elastic material such as rubber or resin. The lid 44 includes a cylindrical locking portion 44a inserted into the opening 42 of the lead wire storage chamber 22 and a disc-shaped closing portion 44b closing the opening 42a. The locking portion 44a has a locking groove 44e that is locked to the edge portion 42a protruding to the peripheral edge of the opening portion, and the engagement between the locking groove 44e and the edge portion 42a prevents the locking portion 44a from falling off.

Further, a groove 44c having a V-shaped cross section is provided in an annular shape on the back surface of the closing portion 44b which is a connecting portion with the inner peripheral side of the locking portion 44a. The groove 44c is for facilitating separation from the locking portion 44a when the closing portion 44b is removed as described later, and the closing portion 44b is engaged by the thin connecting portion 44d provided with the groove 44c. It is connected to the stopper 44a.

Further, a holding portion 44e into which the other end of the communication lead wire 7 is inserted and held is provided on the back surface (upper surface) of the closing portion 44b, and the front surface (lower surface) is provided when the closing portion 44b is removed. A connecting portion 44f to be used is provided. The connecting portion 44f is formed with a lateral small hole 44g. For example, when the closing portion 44b is removed, an elongated tool (not shown) such as a wire is passed through the small hole 44g to move downward (X direction). Lower to.

Since the closing portion 44b is provided with the groove 44c, when the closing portion 44b is pulled downward (in the X direction), the connecting portion 44d is easily disconnected. In addition, since the holding portion 44e into which the other end of the communication lead wire 7 is inserted and held is provided on the back surface of the closing portion 44b, the closing portion 44b is separated from the locking portion 44a and the communication lead is provided. The other end of the wire 7 is pulled out from the lead wire storage chamber 22.

Therefore, since the communication lead wire 7 is pulled out while the blocking portion 44b is cut, the wiring work for connecting the communication lead wire 7 to the terminal device (not shown) can be easily performed. Moreover, the lead wire storage chamber 22 is provided in the center of the bottom portion 1a of the case 1, and is located between the connecting portion 4 to which the upstream pipe 3 is connected and the connecting portion 6 to which the downstream pipe 5 is connected. Therefore, even if the flowmeter is installed near the wall, the communication lead wire 7 can be easily pulled out.

When the use of communication is stopped for convenience, the locking portion 44a left in the lead wire storage chamber 22 is taken out and a new lid 44 is attached as shown in FIG.

Further, as described above, since the lid 44 is fixed by press-fitting the locking portion 44a into the lead wire storage chamber 42, the conventional locking pin is unnecessary, and the locking pin is not necessary. There is no problem caused by deformation of the.

In the above embodiment, the fluid vibration type measurement unit that vibrates the fluid using the fluidic element is described as being housed in the case. However, the present invention is not limited to this, and for example, a turbine type flow rate unit may be used. Of course, it can also be applied to other types of flow meters such as meter and roots type flow meter.

[0033]

[Effect of device]

 As described above, the flowmeter according to the present invention is provided with a lead wire storage chamber in which a lead wire is stored at the bottom of the case, and the opening of the lead wire storage chamber is closed from the bottom side of the case, so that Even when installed in the vicinity, the lead wire can be pulled out regardless of the installation location, and rainwater can be prevented from entering the lead wire storage section even when the weather is strong. Therefore, the lead wire is prevented from being corroded or short-circuited while being housed in the lead wire storage chamber, and the reliability of the flow meter can be further enhanced.

Further, by providing the groove that allows the lid to be separated from the engaging portion, the closed portion of the lid can be easily taken, and the work of pulling out the lead wire can be easily performed. And workability can be improved. Moreover, it does not require a locking pin as in the past, it does not cause any problems due to deformation of the locking pin, and has features such as easy attachment when the lid is reattached.

[Brief description of drawings]

FIG. 1 is a vertical cross-sectional view of an embodiment of a flow meter according to the present invention as viewed from the front.

FIG. 2 is a partially cut vertical sectional view showing the inside of a measurement unit.

3 is a cross-sectional view of the case taken along the line AA in FIG.

FIG. 4 is a bottom view of the case.

FIG. 5 is a vertical cross-sectional view showing an enlarged main part of the present invention.

FIG. 6 is a rear view of a conventional flow meter.

FIG. 7 is a cross-sectional view of the conventional flowmeter taken along the line BB in FIG.

FIG. 8 is a side view of a conventional flow meter.

FIG. 9 is an enlarged vertical sectional view showing a locking structure of a conventional flowmeter.

[Explanation of symbols]

 1 Case 1c Measuring Unit Storage Room 2 Measuring Unit 7 Communication Lead Wire 22 Lead Wire Storage Room 28 Jet Nozzle 29 Columnar Target 36 Outlet 34 Outlet Chamber 35 Oscillation Chamber 37, 38 Pressure Inlet Hole 44 Lid 44a Locking Part 44b Closing Part

Continued Front Page (72) Hideaki Ikeda Inventor Hideaki Ikeda, Kawasaki-ku, Kanagawa Prefecture 1-3-6 Fujimi, Tokiko Co., Ltd. (72) Inventor Tatsuro Kuromaru 1-3-6 Fujimi, Kawasaki-ku, Kanagawa Prefecture Tokiko Corporation In the company

Claims (2)

[Scope of utility model registration request] 1. A flowmeter having a measuring unit housed in a case for measuring the flow rate of a fluid, and a lead wire connecting the measuring unit and an external device, wherein the lead wire is housed in a bottom portion of the case. And a lid for closing the lead wire storage chamber from the bottom side of the case. 2. The lid includes a closing portion that closes an opening of the lead wire storage chamber and an engaging portion that engages with the lead wire storage chamber, and the closing portion is pulled downward. The flowmeter according to claim 1, wherein a groove that allows separation from the engaging portion is provided in the closing portion.