JP2011169826A - Metering device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a technique capable of accurately, as well as, readily determining a deteriorated state accompanying heat deterioration of each component accommodated in a component accommodation compartment, in an atmospheric open state provided inside a casing. <P>SOLUTION: A metering device includes a component accommodation compartment C0 in an atmospheric open state inside a casing C, and a component 30 accommodated in the component accommodation compartment C0 is provided with a heat history indication part I, having a state changed by thermal deterioration with the lapse of time. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a weighing device including a component housing chamber in an air-released state inside a casing.

  The utility consumption section of a house that consumes utilities such as gas, electricity, water, etc. has a measuring section that measures the utility supplied to the consumption section, such as a gas meter, power meter, and water meter, inside the outer casing. The provided weighing device is installed.

  The metering unit provided in this type of metering device, especially the metering unit of a metering device equipped with a rubber membrane for metering gas, is subject to deterioration due to heat when used outdoors for a long time. May occur and the measurement accuracy may be reduced.

  Moreover, in order to suppress a decrease in measurement accuracy due to such heat deterioration of the measurement unit, such a measurement device is periodically replaced, for example, every 10 years, and further, after use recovered by the replacement The weighing device may be reused, that is, so-called recycled, after replacing or repairing a part in which the thermal degradation of the weighing unit or the like is predicted.

  The parts handled in this way include parts such as rubber or resin sealing materials, parts bonded with an adhesive, electrical parts, liquid crystal monitors, and the like. It is desirable to replace or repair such parts periodically in order to suppress deterioration of the heat deterioration performance.

  It is economically advantageous to set the interval for such replacement or repair as long as possible in accordance with the deterioration state of the part. However, in order to know the deterioration state of the part, the outer casing is disassembled. The parts contained inside must be inspected directly.

  Therefore, an IC sensor memory that detects and stores a temperature history or the like as a component storage device that can know the deterioration state of the component without disassembling the outer casing, and the temperature stored in the IC sensor memory. Weighing device (patent document 1) that can determine the remaining life of a component based on history, etc., and a weighing device (patent document 1) provided with a heat history display part whose optical state changes with time due to the influence of heat Document 2) is known.

JP 07-306239 A JP 2006-258495 A

  However, although the components in the component storage chamber are open to the atmosphere, they are normally stored in a sealed casing that is shielded from light. In other words, since each component is open to the atmosphere, it is affected by atmospheric conditions such as humidity (moisture) and acidity (acid gases such as NOx and SOx) in addition to temperature, and is simply stored in the IC sensor memory. The lifetime of each component cannot be accurately determined only by the temperature history.

On the other hand, since each component is housed in a light-shielded casing, there is almost no light deterioration, and a heat history display unit in which the optical state changes with time due to the influence of heat is provided on the outer surface of the outer casing. In this case, the light deterioration state of the heat history display part does not reflect the deterioration state of the components housed inside, and the state change amount of the heat history display part also indicates the deterioration degree of each part. It did not appear exactly.

  In view of the above circumstances, an object of the present invention is to provide a technique capable of accurately and simply determining a deterioration state associated with thermal deterioration of each component housed in an air-released component housing chamber provided inside a casing. There is to do.

〔Constitution〕
Therefore, a characteristic configuration of the present invention is a weighing device including a component storage chamber in an air-released state inside a casing, and heat that changes in state due to thermal deterioration over time in the component stored in the component storage chamber. The history display unit is provided.

[Function and effect]
Since the heat history display unit is provided for the components accommodated in the component storage chamber, the environment in which the heat history display unit is thermally deteriorated is aligned so that the components stored in the component storage chamber are deteriorated based on the same environment. I can keep it. That is, since the heat history display unit is housed in the same component housing chamber as the component, the atmospheric conditions are exposed to the same temperature, humidity, etc., and the light shielding conditions by the component housing chamber also match, It is not necessary to consider the effects of light degradation. For this reason, it is possible to realize a state in which factors having different degrees of deterioration are eliminated as much as possible between the thermal history display section and the parts. Therefore, since the deterioration state of the heat history display unit accurately reflects the deterioration state of the component, the deterioration state of the component can be accurately known based on the display state of the heat history display unit. .

  Therefore, it is possible to accurately estimate the replacement time of the parts in the weighing device by simply adding a simple configuration, so that the parts can be safely and efficiently recycled and effectively used. became. In addition, since the weighing device as described above is regularly disassembled and inspected regardless of whether or not the parts are exchanged, and there is an opportunity to visually check the internal parts, the measuring apparatus is provided for each of the inspections. Based on the display state of the heat history display section, the deterioration state of each component may be determined, and only the deteriorated component may be replaced. If it does in this way, it can be used continuously, without replacing | exchanging other components with a low degradation degree only by minimum necessary component replacement | exchange.

〔Constitution〕
In addition, it is preferable that the said heat history display part is what uses a resin material as a main ingredient. Furthermore, it is preferable that the resin material contains an antioxidant.

[Function and effect]
In other words, normal resin materials are deteriorated by heat and various physical properties change, and therefore, due to deterioration when placed in a thermal environment equivalent to the part for the elapsed time near the life of the part. In addition, it is possible to appropriately select one in which state changes such as color and light reflectance are observed, and it is possible to easily know the replacement time of the parts. In addition, since the state change of the resin material is usually mainly caused by an oxidation reaction by heat, the state change of the heat history display portion is controlled by controlling the degree of progress of the oxidation reaction. Can be expressed in accordance with That is, by adding an antioxidant to the resin material and adjusting the content of the antioxidant, the state change of the heat history display portion can be expressed in the vicinity of the life of the component. You will be able to know when to replace it.

  In addition, as a heat history display part, it forms as a tape part which affixed tape materials, such as polyester type, vinyl type, acrylic type, butadiene type, or PPS type, or acrylic type, urethane type, polyester type, or It can be formed as a painted surface coated with an epoxy-based paint.

  In addition, as the antioxidant, phenol, hindered phenol, sulfur, organic phosphorus, and the like can be used.

  Specifically, as the phenolic antioxidant, for example, 2,6-ditertiarybutyl-4-methylphenol, n-octadecyl-3- (4-hydroxy-3,5-ditertiarybutyl) Phenyl) propionate, tetrakis [3- (3,5-ditertiarybutyl-4-hydroxyphenyl) propionyloxymethyl] methane, triethyleneglycol-bis [3- (3-tertiarybutyl-4-hydroxy- 5-methylphenyl) propionate], 4,4′-butylidenebis (6-tertiarybutyl-m-cresol), 4,4′-thiobis (6-tertiarybutyl-m-cresol), 1,3, 5-tris (3,5-ditertiarybutyl-4-hydroxybenzyl) isocyanuric acid, 1,1,3-tris (2-methyl-4-hydroxy-5-tertiarybutylpheny ) Butane, 3,9-bis [2- [3- (3-tertiarybutyl-4-hydroxy-5-methylphenyl) propionyloxy] -1,1-dimethylethyl] -2,4,8,10 -Tetraoxaspiro [5.5] undecane and the like. Sulfuric antioxidants are esters of thioalkanoic acid, such as dilauryl ester, dimyristyl ester, distearyl ester, didocosyl ester, glycerin, trimethylolethane, trimethylolpropane, pentaerythritol, trishydroxyethyl And esters with polyhydric alcohols such as isocyanurates.

〔Constitution〕
It is preferable that the component includes at least one selected from a shut-off valve, a seismic device, a pressure switch, and a control board.

[Function and effect]
In other words, there are various types of components that can be accommodated in the component accommodating chamber. Among them, the shut-off valve, the seismic device, the pressure switch, and the control board are mainly composed of rubber or resin material. In particular, it is often necessary to determine whether or not replacement is required at the time of inspection. In addition, the life of each part is not uniformly determined, and the environment in which heat deterioration occurs also varies in the part storage chamber, so the replacement time must be determined for each part. Therefore, if the shut-off valve, seismic device, pressure switch, and control board are provided with a heat history display section, these parts can be used effectively and safely during the period up to the end of their service life. Reliability as a device can be improved.

〔Constitution〕
A paint whose optical properties change according to the thermal history may be applied, and the thermal history display part may be provided on the part, or a tape part whose optical properties change according to the thermal history is pasted, and the part is A heat history display unit may be provided.

[Function and effect]
That is, the thermal history display unit only needs to be able to optically recognize a change in physical properties of a material whose optical properties change according to the thermal history, and thus the component itself is configured using a material whose optical properties change according to the thermal history. However, it is preferable to provide it in the form of the paint or the tape part because a heat history display part can be easily formed and can be applied to various parts with high versatility.

Gas meter perspective view Longitudinal section of the main part of the gas meter Disassembled perspective view of main parts of gas meter Perspective view of main parts of gas meter Plan view of main parts of gas meter Perspective view of gas meter parts storage chamber Schematic view of the parts storage chamber Flow chart of inspection method

Embodiments of the present invention will be described with reference to the drawings.
In the following description, the configuration of a membrane gas meter will be described as an embodiment of the weighing device according to the present invention.

[Membrane gas meter]
As shown in FIG. 1, the membrane gas meter 100 is assembled by using an outer casing C having a gas supply port 1 and a gas discharge port 2, and the gas supply port 1 and the gas discharge port 2 provide a housing. Connected in the middle of a gas supply pipe (not shown) that supplies gas to a gas demand destination such as a gas flow meter, the flow rate of the gas flowing through the gas supply pipe is measured, and measured on the display unit 3 provided outside the outer casing C The gas flow rate is displayed.

  As shown in FIGS. 1 and 2, the outer casing C includes a lower casing C1 and an upper casing C2. The upper casing C2 includes a pressure sensor 38 for detecting the gas pressure supplied to the membrane gas meter 100, a seismic device 34 for detecting earthquake vibration, and a gas supply shut-off valve 30, and a control for controlling them. A component storage chamber C0 (see FIG. 6) for storing components such as the control base 32 provided with the portion 7 is formed.

  As shown in FIG. 3, the lower casing C <b> 1 of the membrane gas meter 100 includes a valve portion V that controls supply / discharge of gas to / from the measurement chamber 4 and a membrane portion F that reciprocates by supply / discharge of gas to / from the measurement chamber 4. , The rotating body R interlocked to the film part F by the link mechanism L so as to make one rotation in one reciprocation of the film part F, and located at a position radially away from the rotation axis. Along with the reciprocation of F, the magnet 5 provided to rotate around the rotation axis, the reed switch 6 that operates when the magnet 5 rotates to a specific rotation phase, and the reed switch 6 A control unit 7 (see FIG. 5) for ascertaining the flow rate based on the signal and the set measurement reference flow rate and displaying the obtained flow rate on the display unit 3 is assembled. The valve portion V and the rotating body R are attached to the upper portion of the lower casing C1, and are provided so as to be accommodated in the upper casing C2 when the upper casing C2 is assembled. On the other hand, the film part F is provided inside the lower casing C <b> 1 and forms a partition wall of the measuring chamber 4.

  In addition, the interior of the component storage chamber C0 is maintained by setting the internal environment to be equal to the ambient atmospheric pressure environment through the air communication hole a.

  Each of the above-described components is controlled by the control unit 7 when the pressure sensor 38 detects an abnormal pressure or when the seismic device 34 detects an earthquake. Is configured to function in cooperation with each other by, for example, displaying the abnormal information on the display unit 3.

  In FIG. 1, reference numeral 8 denotes a return shaft cap that covers an operating portion of a return shaft (not shown) for releasing the shutoff state of the gas supply shutoff valve 30. Incidentally, an O-ring for making the inside of the outer casing C airtight is provided in a through portion of the upper casing C2 of the return shaft.

  As shown in FIGS. 2 and 3, the lower casing C <b> 1 is partitioned by a partition wall 9 at the center, and a substantially cylindrical measuring chamber forming space having the partition wall 9 as a bottom on each side of the partition wall 9. In addition, the central part of each measuring chamber forming space is partitioned by the membrane part F, and the opening part of each measuring chamber forming space is closed by the lid 10 to form the measuring chambers 4 on both sides of each film part F. It is. That is, a pair of film portions F are provided, and four measuring chambers 4 are formed.

  When the film part F is described based on FIGS. 2 to 4, the film part F is provided in a state where the peripheral part is fixed to the lower casing C <b> 1 forming the measurement chamber 4 by the frame-shaped film conditioning plate 14. It is composed of a film material (specifically composed of a rubber film) 11 and a circular film plate 12 held at the center of each of both surfaces of the film material 11. Is provided with a hinge stand 13. The film material 11 is formed of flexible rubber.

  As shown in FIGS. 2 to 4, the blade shaft 16 is rotatable in a state in which its axial center is directed in the vertical direction and the upper end side is airtightly penetrated through a hole formed in the upper wall of the lower casing C1. The blade 15 is supported on the blade shaft 16. That is, the wing 15 is supported by the wing shaft 16 in a swingable manner on the lower casing C1.

  More specifically, as shown in FIG. 4, a blade shaft box 160 that is screwed into this portion is provided in a through-hole portion of the upper wall of the lower casing C <b> 1. The structure which penetrates is adopted. A rubber material 161 for sealing is fitted on the upper side of the blade axis box 160, and an airtight state is maintained.

  As shown in FIG. 4, a hinge shaft 26 supported at the tip of the blade 15 connected to the blade shaft is inserted into the hinge table 13 so as to be relatively rotatable around the axis, thereby reciprocating the membrane portion F. The membrane portion F and the wing 15 are connected so that the wing 15 swings accordingly. The plate board 13 is provided with an insertion hole forming portion 13a and a hinge shaft insertion hole 13b.

  As shown in FIGS. 2, 3, and 5, the link mechanism L includes two sets of a large elbow 17 and a small elbow 18 in which ends are pivotally connected to each other. The upper end portion of each blade shaft 16 is fixedly connected to one end of each large elbow 17.

  As shown in FIGS. 3 and 5, the rotating body R includes a crankshaft 20 that is supported on a support base 19 mounted on the upper wall of the lower casing C1 so as to be rotatable about a vertical axis, and the crankshaft 20 The crankshaft 20 is attached to the crankshaft 20 so as to protrude outward in the radial direction.

  The magnet 5 is provided on the outer peripheral side of the upper surface of the rotating disk 21, and the reed switch 6 is provided on the outer periphery of the rotating disk 21 and supported by the support base 19.

  As shown in FIGS. 3 and 5, the valve portion V is provided on the upper wall of the lower casing C <b> 1 so as to control the supply and discharge of the gas in the four measurement chambers 4, and the valve portion V is the membrane portion F. It is provided to be opened and closed by reciprocating motion.

  The valve portion V will be described with reference to FIG. 5. Two gas supply / exhaust ports X communicating with the two measuring chambers 4 opposed to each other through the membrane portion F are provided on the upper wall of the lower casing C1. Are arranged side by side at intervals, so that two sets of gas supply / exhaust ports X in which two gas supply / exhaust ports X are arranged are provided, and between each gas supply / exhaust port X, a gas exhaust port Y is provided. Is provided. In other words, two rows of supply / discharge openings are formed on the both sides of the gas discharge port Y, in which two gas supply / discharge ports X are arranged.

  The gas discharge port Y of each supply / discharge opening row is connected to a gas discharge connection port Z provided on the upper wall of the lower casing C1 through a gas discharge path (not shown). The port Z is connected to the gas discharge port 2 through a gas discharge path (not shown) provided in the upper casing C2 in a state where the upper casing C2 is provided on the lower casing C1.

  An oscillating valve 23 is provided on an upper portion of each supply / discharge opening row so as to be swingable in the direction in which the openings of the supply / discharge opening rows are aligned by a vertical shaft portion. The back surface of the oscillating valve 23 is provided with a communication recess (not shown). The oscillating valve 23 is positioned at each oscillating end, and the gas supply / exhaust port X and the gas outlet on the oscillating end side. Y is connected to the communicating recess and the gas supply / exhaust port X on the opposite side of the swinging end is opened, and both the gas supply / discharge ports X are closed in a state of being located at the center of the swinging direction. It is configured.

  As shown in FIG. 5, one end of the crank base 24 is pivotally supported by a shaft portion 22 a provided at the tip of the crank arm 22 so that the axis is directed in the vertical direction, and each large shaft is provided at the upper end portion of each blade shaft 16. One end of the elbow 17 is pivotally supported, and one end of both the small elbow 18 is pivoted to a position eccentric from the pivot axis with respect to the crank arm 22 in the crank base 24, whereby the membrane portion F and the rotating body are supported. R and the two crank rods 25 connected to the shaft portion 22a of the crank arm 22 are connected to each swing valve 23.

  When the pair of membrane portions F reciprocate once, each blade shaft 16 rotates at a predetermined angle, and along with the rotation, the rotating body R rotates once by the link mechanism L, and each swing valve 23 is rotated. Is configured to control the supply and discharge of gas to and from the four measuring chambers 4.

  That is, the valve portion V includes two swing valves 23 and two rows of supply / discharge openings corresponding to the swing valves 23 (two gas supply / discharge ports X on both sides of the gas discharge port Y). And the gas is supplied to and discharged from the four measuring chambers 4 by the swinging of the two swing valves 23, and the valve portion V is used for the reciprocating motion of the membrane portion F. The blade shaft 16 and the valve portion V are connected to each other by a crank mechanism including a link mechanism L, a crankshaft 20 and a crank arm 22 so as to be opened and closed.

  6 is a partially cutaway perspective view of the upper casing C2 of the gas meter 100, and FIG. 7 is a system diagram showing a gas flow path and an electric block of the gas meter 100. As shown in FIG.

  When gas is supplied from the gas supply port 1 of the gas meter 100, the gas flows from the shutoff valve 30 through the passage 31 to the measuring chamber 4 such as a membrane gas meter, and the gas flow rate is measured. The gas that has been metered passes through the metering chamber 4 and is distributed from the gas outlet 2 to the gas consuming device.

  A component housing chamber C0 is formed in the upper casing C2 of the gas meter 100, a control board 32 is mounted, and a battery 33 that can be used for a long time, such as a lithium battery, is used as the power source. The seismic device 34 is mounted on the control board 32, and the remaining electric circuit (for example, a pressure sensor 38) is also mounted on the control board 32. When an earthquake is detected by the CPU 35 constituting the control unit 7, the display lamp 36 is turned on, and the user can be notified of the occurrence of the earthquake. Further, the shutoff valve 30 is closed depending on the earthquake level. In this way, it is possible to prevent gas from being supplied to the measuring chamber 4 and the gas discharge port 2, and to prevent a fuel gas leakage accident on the downstream side of the gas meter 100. The shut-off valve 30 returns to its original state when the return button 8 is operated, and the gas supply is resumed.

  On the other hand, the amount of gas detected in the measuring chamber 4 is converted into an electric signal and input to the CPU 35 mounted on the control board 32. In addition, an external signal 37 can be input to the CPU 35 via the control board 32 from a gas leak alarm or an incomplete combustion alarm installed in the vicinity of the gas consuming device, and the display is based on the external signal 37. The lamp 36 and the shutoff valve 30 can also be operated.

  In the component housing chamber C0 formed in the upper casing C2 of the outer casing C of the membrane gas meter 100 configured as described above, heat that deteriorates due to thermal deterioration with respect to each component housed. A history display section I is provided (see FIG. 6).

  This heat history display part I is made of, for example, a rubber or plastic part, particularly a part such as a shut-off valve, which is housed in the part housing chamber C0 and has a heat deterioration so that it needs to be replaced or repaired. The optical state such as chromaticity and light reflectivity at the time of the influence is visually compared with the optical state at the initial time before the new film type gas meter 100 is installed at the place of use and affected by heat. Or it changes to such an extent that it can be recognized by measurement with a measuring instrument.

  The thermal history display part I whose optical state changes with time due to the influence of heat can be configured as a tape part with a predetermined tape material affixed to each part or formed as a painted surface with a predetermined paint applied. it can. 6 shows the thermal history display portion I provided for each component (30, 32, 34, 38) by shading the entire surface where the painted surface is formed, but it is provided as a tape portion. In this case, the heat history display part I is formed in a part of each component (30, 32, 34, 38).

  Specifically, when the heat history display part I is configured as a tape part, a green polyester tape material (manufactured by Nitto Denko, No31R) is bonded using an acrylic adhesive, whereby the heat The history display part I can be formed. In addition to the polyester tape material, a vinyl tape material, an acrylic tape material, a butadiene tape material, a PPS tape material, or the like can be used as the tape material. Further, a tape material (for example, Nichiban Mitack color label) in which an ink whose optical state changes with time due to the influence of heat is infiltrated into a paper base material can also be used.

  On the other hand, when the heat history display part I is configured as a paint surface, acrylic paint such as acrylic melamine paint (manufactured by Kawakami Paint, Acryca B-160), other paints such as urethane paint, polyester The heat history display part I can be formed as a paint surface by a paint, an epoxy paint or the like.

  Then, as the thermal deterioration of each component proceeds, the optical state of the heat history display portion I changes.

  In addition, as the time left in the thermal environment becomes longer, for resin parts, for example, in the case of polyacetal resin, thermal degradation occurs in a state where tensile elongation increases, or the size shrinks due to crystalline resin. Changes in physical properties are seen.

  On the other hand, for rubber parts, it is known that when the base material is a diene rubber, it thermally deteriorates in a state where the crosslinking density increases. Of course, the higher the environmental temperature is, the more the thermal deterioration is promoted.

  As for the state change portion I formed as a tape portion or a painted surface, the longer the time left in the thermal environment, the greater the degree of change in the optical state such as the color change with respect to the initial chromaticity. The optical state of the heat history display section I changes with a predetermined correlation with the deterioration state of the parts.

  Further, when such a correlation can be grasped in advance, based on the correlation, the deterioration state of each component is estimated more accurately from the degree of change in the optical state of the thermal history display section I. can do.

  The degree of progress of the heat deterioration state of such parts changes due to the difference in average temperature or sunshine time at the place where the membrane gas meter 100 is installed, and accordingly, the heat history display section The degree of change in the optical state of I will also change.

〔Inspection method〕
The above is the description of the configuration of the membrane gas meter 100. The inspection method for the membrane gas meter 100 is, for example, a membrane gas meter 100 collected after an effective period of 10 years or the like (hereinafter referred to as a proof meter 100). .)), The degree of change in the optical state of the state change portion I provided in the proof meter 100 is measured visually or with a measuring device, and the degree of change in the optical state of the thermal history display portion I is measured. Based on this, the deterioration state of parts such as the shutoff valve 30 is estimated.

  Note that the difference in the deterioration state in each membrane gas meter 100 is caused by, for example, a difference in average temperature or a difference in sunshine time at the installation location.

Specifically, as shown in FIG. 8, when the component storage chamber C0 of the proof meter 100 is first inspected and disassembled, the heat history display portion I provided for each component is recovered (step # 1). . Then, the chromaticity or light reflectance as the optical state of the thermal history display section I is measured (step # 2).
For this measurement, an optical device such as a chromaticity measuring device or a light reflectance measuring device is used to recognize the degree of change in the optical state of the accurate thermal history display section I.

  Next, the optical state of the heat history display unit I measured in this way is compared with the optical state of the heat history display unit I at the initial time point, and a test that requires replacement or repair of parts such as the shut-off valve 30 is performed. The full meter 100 is selected (step # 3), and parts are replaced or repaired only to the selected full meter 100 (step # 4).

  That is, when the degree of change in the optical state relative to the initial time of the heat history display section I is more than a certain level, wrinkles due to thermal degradation in the shutoff valve 30 or performance degradation due to thermal degradation of other components, etc. As described above, since the deterioration state of the parts is estimated to be large, the proof meter 100 needs to disassemble the outer casing C up and down and inspect the inside in detail to replace or repair the parts as necessary. If there is, it will be sorted, disassembled or repaired, and recycled.

  On the other hand, if the degree of change in the optical state with respect to the initial time of the heat history display part I is less than a certain level, the deterioration state of the part is estimated to be small, so that it is not necessary to replace or repair the part The meter 100 is selected, and without being disassembled or repaired, for example, performance inspection or the like is performed as appropriate, and it is provided for recycling.

  Further, when the calibration meter 100 as described above is used for recycling, the thermal history display unit I is replaced with a new one, so the degree of change in the optical state of the new thermal history display unit I is as follows. This is due to the influence of the heat received during the use.

  In the above example, a membrane gas meter is used as an example of a metering device. However, various types of gas meters, water meters, and electric meters can be used as long as the metering device has a component housing chamber that is open to the atmosphere inside the casing. The present invention can be applied to a weighing device in which a similar component housing chamber is provided in an equal internal structure and a component that is thermally deteriorated is used.

The present invention can know the deterioration state of the parts with thermal deterioration provided in the exterior casing only by adding a simple and inexpensive configuration, so that the parts of the weighing device can be used safely and efficiently. It is possible.

100 Membrane Gas Meter C Exterior Casing C0 Parts Housing Chamber C1 Lower Casing C2 Upper Casing V Valve F F Membrane L Link Mechanism I Thermal History Display R Rotating Body X Gas Supply / Exhaust Y Gas Exhaust Z Z Gas Exhaust Connection 1 Gas supply port 2 Gas discharge port 3 Display unit 4 Weighing chamber 5 Magnet 6 Reed switch 7 Control unit 8 Return button 9 Partition wall 10 Lid 23 Swing valve 30 Shut-off valve (parts)
31 Passage 32 Control base (parts)
33 Battery 34 Shock absorber (parts)
35 CPU
36 Indicator lamp 37 External signal 38 Pressure sensor (component)

Claims (6)

  A weighing device having a component housing chamber in an air-released state inside a casing, wherein a heat history display unit that is thermally deteriorated and changes its state is provided in a component housed in the component housing chamber. .   The weighing device according to claim 1, wherein the heat history display unit is mainly composed of a resin material.   The metering device according to claim 2, wherein the resin material contains an antioxidant.   The component storage chamber is a component storage chamber of a membrane gas meter that measures the flow rate of gas flowing inside the apparatus, and the component includes at least one selected from a shut-off valve, a seismic detector, a pressure switch, and a control board. The weighing device according to claim 1, wherein the weighing device is included.   The weighing device according to any one of claims 1 to 4, wherein a coating material whose optical physical properties change according to a thermal history is applied, and the thermal history display unit is provided on the component.   The measuring device according to any one of claims 1 to 4, wherein a tape portion whose optical properties change according to a heat history is attached, and the heat history display portion is provided on the component.

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