JPH11211531A - Membrane type gas meter with temperature correction function - Google Patents

Abstract

PROBLEM TO BE SOLVED: To highly accurately measure the gas using amount of a membrane type gas meter for household. SOLUTION: A first measurement membrane 26a is provided in a first measurement space 28a so as to be displaced back and forth and a magnet 64 is connected to the first measurement membrane 26a. A displacement detection sensor 65 generates the displacement detection signals of the first measurement membrane 26a for every approach of the magnet 64 and a temperature sensor 63 detects the temperature of gas. In a microcomputer 56, the mechanical measurement error of the volume of the gas generated by the temperature is obtained and stored beforehand. The microcomputer 56 obtains the volume of the gas corresponding to the displacement detection signals and corrects the obtained volume of the gas based on Boyle-Charles' law and the mechanical measurement error in response to the output of the temperature sensor 63. By temperature correction considering the mechanical measurement error such as the hardening at a low temperature of the measurement membrane the using amount of the gas is highly accurately measured.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a film type gas meter with a temperature correction function used for measuring the amount of gas used at home.

[0002]

2. Description of the Related Art Conventionally, a membrane gas meter has been used for measuring a household gas consumption. FIG. 11 is a schematic diagram showing a schematic configuration of a conventional membrane gas meter. A pair of measuring spaces 4 are formed in the housing 3 of the membrane gas meter 1, and a measuring film 7 that divides the measuring space 4 into two measuring chambers 5 a and 5 b is provided in each measuring space 4. Each of the measuring chambers 5a and 5b communicates with a gas supply port 9 and a gas discharge port 10 through a gas flow path 8, and the gas flow path 8 is provided with a valve body 11 for opening and closing the gas flow path 8. I have. When the gas consumption causes a pressure difference between the gas pressures in the two measuring chambers 5a and 5b, the measuring membrane 7 is displaced toward the measuring chamber having a lower pressure. The displacement of the measuring film 7 is transmitted to the valve body 11 via a crank mechanism (not shown),
Opens and closes the gas flow path 8 so that the measuring film 7 is repeatedly reciprocated in the measuring space 4. Thereby, the gas supply port 9
Is discharged from the gas outlet 10 through the metering space 4. In addition, the displacement of the measuring film 7 is transmitted to a counter (not shown), and the integrated value of the volume of the gas that has passed through the measuring space 4 is displayed. The pressure of the gas supplied for home use is, for example, atmospheric pressure + 200 mmH ₂ O.

On the other hand, an impeller gas meter is mainly used for measuring the amount of gas used for industrial use. The impeller gas meter is configured such that a rotating body having a plurality of blades is provided in a gas flow path, and the impeller is rotated by kinetic energy of gas. The rotation of the impeller is transmitted from the shaft of the impeller via a gear train to a counting display, and the integrated value of the volume of gas passing through the gas flow path is displayed. The pressure of the gas supplied for industrial use is, for example, atmospheric pressure + 10,000
0mmH is a ₂ O.

[0004] Normally, the gas charge is set based on the amount of gas used in a reference state consisting of a predetermined reference pressure and reference temperature. The reference pressure is, for example, atmospheric pressure, and the reference temperature is, for example, 20 ° C. As mentioned above, the pressure of gas supplied for industrial use is very high, reaching about twice the atmospheric pressure. Therefore, there is a large difference between the volume of the gas measured and the volume of the gas in the reference state, which causes a problem in charge calculation. For this reason, in the measurement of the amount of gas used for industrial use, the volume of the measured gas is corrected to the volume of the gas in the reference state based on Boyle-Scharl's law, and the corrected correction gas volume is integrated. The obtained corrected integrated value is used as a gas usage amount for charge calculation.

[0005] On the other hand, the pressure of gas supplied for home use is close to atmospheric pressure, which is much lower than that for industrial use. Therefore, the difference between the volume of the gas measured and the volume of the gas in the reference state is very small compared to the industrial use,
Even if no correction is made, there is no problem in the charge calculation. For this reason, in the measurement of household gas usage, the measured gas volume is integrated without correction, and the calculated integrated value is used as the gas usage for charge calculation.

[0006]

As described above, in the measurement of household gas consumption, the accuracy required for fee calculation can be obtained without any correction, so that the correction of the volume of the measured gas is not possible. Not done. However, it is necessary to perform more accurate measurement, and such a household gas meter is expected to be adopted in the future. Normally, a home-use membrane gas meter is often installed outdoors. In this case, not only does the temperature fluctuate by several tens of degrees depending on the season, but also a similar temperature difference may occur within a day. . Therefore, in order to perform more accurate weighing than in the past, it is necessary to perform temperature correction. The present inventors have conducted detailed research on the temperature correction, and as a result, have obtained the following knowledge.

(1) If the volume of the gas to be measured is temperature-corrected based on Boyle-Scharl's law, the metering accuracy of the domestic membrane gas meter can be improved. However, even if the above correction is performed, a slight measurement error remains. (2) The weighing error remaining after the correction is based on the temperature dependency of the mechanical resistance of the weighing film or the like, and it is necessary to correct the mechanical weighing error in order to further increase the weighing accuracy.

The present invention has been made based on the above findings, and an object of the present invention is to provide a film type with a temperature correction function capable of measuring the amount of household gas used with high accuracy regardless of the ambient temperature. It is to provide a gas meter.

[0009]

According to the present invention, a gas supply port and a gas discharge port are provided, and a pair of measuring spaces are formed. Further, the gas supply port, each measuring space, and the gas discharge port communicate with each other. And a housing in which a gas flow path is formed, and each of the measuring spaces is provided in each of the measuring spaces, the measuring space is divided into two measuring chambers, and a reciprocating displacement in each of the measuring spaces is caused by a gas pressure difference between the measuring chambers. Membrane, gas distribution means for opening and closing the gas flow path according to the displacement of the measuring membrane and distributing gas to each measuring chamber, temperature detecting means for detecting the temperature of the gas, and the measuring membrane reciprocatingly displaces in the measuring space. And a displacement detection means for generating a displacement detection signal each time, a volume of the gas passing through the measuring space is determined based on an output of the displacement detection means, and the volume of the determined gas is corrected based on an output of the temperature detection means. To determine the correction gas volume, Calculating means for calculating the corrected integrated value by integrating the calculated corrected gas volume, outputting at least the corrected corrected integrated value as a signal, and display means for displaying a numerical value corresponding to the output signal based on the output of the calculating means. Is a film-type gas meter with a temperature correction function.

According to the present invention, the temperature detecting means detects the gas temperature, and the displacement detecting means generates a displacement detecting signal of the measuring membrane. The calculating means calculates the gas volume based on the displacement detection signal, corrects the calculated gas volume based on the detected gas temperature, integrates the corrected gas volume, and outputs a corrected integrated value as a signal. Further, the display means displays the corrected integrated value. As a result, the volume of the gas is corrected based on the detected temperature of the gas so as to cancel the measurement error, so that the measurement can be performed more accurately than in the past. The temperature correction is not limited to the correction based on Boyle-Charard's law, but can be performed for all measurement errors due to temperature fluctuations. Accuracy can be further improved.

The calculating means of the present invention calculates the uncorrected integrated value by integrating the determined gas volume, and selectively selects one of the determined corrected integrated value and the determined non-corrected integrated value. Is output.

According to the present invention, it is possible to always output a corrected integrated value, and to output a non-corrected integrated value by selection, so that accurate information on gas usage can be quickly and reliably grasped. it can.

In the calculation of the correction gas volume by the arithmetic means of the present invention, the mechanical measurement error of the volume of the gas generated depending on the temperature is obtained in advance, and the Boyle-Scharle law and the obtained mechanical measurement error are calculated. It is characterized by being performed on the basis of.

According to the present invention, the correction of the volume of the gas is performed not only based on Boyle-Charle's law,
Since the measurement is performed based on the mechanical measurement error of the gas volume generated by the temperature, even if the measurement film becomes harder and the elasticity decreases as the temperature decreases, the measurement error due to the increase in mechanical deformation resistance Is negated. Therefore, measurement accuracy can be improved as compared with a film-type gas meter that does not consider a mechanical measurement error.

Further, the displacement detecting means of the present invention is connected to the measuring membrane and is displaced in accordance with the displacement of the measuring membrane, and opposes the permanent magnet piece with the side wall of the housing interposed outside the measuring space. And a displacement detection sensor that generates a displacement detection signal of the measuring film in accordance with the approach of the permanent magnet piece.

According to the invention, the permanent magnet piece of the displacement detecting means is connected to the measuring film, and is displaced in accordance with the displacement of the measuring film.
The displacement detection sensor is provided outside the measurement space so as to face the permanent magnet piece, and generates a displacement detection signal of the measurement film in accordance with the approach of the permanent magnet piece. As a result, the permanent magnet piece approaches or separates from the displacement detection sensor following the displacement of the measuring film, so that the displacement detecting sensor can detect the displacement of the measuring film and generate a displacement detection signal. Since the displacement of the measuring film is proportional to the volume of the gas passing through the measuring space, the displacement detecting means can generate a signal representing the gas volume with a simple configuration.

Further, according to the present invention, there are provided a plurality of display reels which rotate according to the displacement of the measuring film, and counting display means for displaying an integrated value of the volume of gas passing through the measuring space by the display reel. It is characterized by being.

According to the present invention, since the counting means for mechanically displaying the gas usage is provided, the gas usage can be reduced even if the display means for electrically displaying the gas usage has a problem. It can be displayed reliably.

[0019]

DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is a simplified front view showing the structure of a film type gas meter with a temperature correction function according to an embodiment of the present invention, and FIG. 2 is a membrane with a temperature correction function shown in FIG. It is a side view of a type gas meter. The membrane gas meter 14 with a temperature correction function is a gas meter used for measuring the amount of gas used at home, and includes a gas meter main body 15, a temperature correction device 16, and a count counter 17 as a count display means. You. The gas meter main body 15 is a gas measuring container, and the gas passes through the internal space. Gas meter body 1
The housing 19 of 5 includes an upper housing 20 and a lower housing 21, and a gas supply port 23 and a gas discharge port 24 are formed in an upper part of the upper housing 20. The temperature correction device 16 is provided on the front surface (the left side in FIG. 2) of the lower housing 21 and temperature-corrects the measured gas volume to electrically display the gas usage. Counting counter 17
Is provided on the front surface of the upper housing 20 and mechanically displays the gas usage. The configurations of the gas meter main body 15, the temperature correction device 16, and the counter 17 will be described later.

FIG. 3 is a simplified front view showing the structure of the gas meter body 15 shown in FIG. 2, FIG. 4 is a side view of the gas meter body 15 shown in FIG. 3, and FIG. 5 is a gas meter body shown in FIG. 15 is a plan view of FIG. Gas meter body 15
Comprises a housing 19, first and second metering membranes 26a,
26b and a gas distribution device 27. A first measuring space 28a and a second measuring space 28b are formed in a pair in the lower housing 21 of the housing 19, and a first and a second measuring film 26a, 26b are formed in each of the measuring spaces 28a, 28b. Each is provided. Thereby, the first measuring space 28a is partitioned into the first measuring chamber 29 and the second measuring chamber 30, and the second measuring space 28b is
It is partitioned into a third measuring chamber 31 and a fourth measuring chamber 32. Hereinafter, when the first measuring film 26a and the second measuring film 26b are collectively referred to as the measuring film 26.

In the upper housing 20 of the housing 19, a first valve seat 33a and a second valve seat 33b are formed above the first metering space 28a and the second metering space 28b, respectively. Are formed with first gas flow paths 34a and 34b, second gas flow paths 35a and 35b, and third gas flow paths 36a and 36b, respectively.
FIG. 4 shows only the gas passages with the suffix b, and does not show the gas passages with the suffix a. First
The gas flow paths 34a and 34b are connected to the first measuring chamber 29 and the third
The second gas flow path 35 communicates with the measuring chamber 31.
a and 35b communicate with the second measuring chamber 30 and the fourth measuring chamber 32, respectively. The third gas flow paths 36a, 36b
Communicates with the gas outlet 10.

The measuring film 26 is made of a flexible material such as synthetic rubber, for example, and reciprocates in each of the measuring spaces 28a and 28b due to a gas pressure difference between the measuring chambers. Measuring membrane 26
, A metal film plate 38 is attached, and a connecting member 39 is attached to the outer surface of the film plate 38. Membrane plate 3
8. The connecting member 39 and the measuring membrane 26 are fixed by bolts 40 and nuts 41.

The gas distributor 27 includes first and second swing blades 43a and 43b, and first and second blade shafts 44a and 44a.
b, link means 45, first and second valve bodies 46a,
46b. The first swinging blade 43a is provided in the first measuring chamber 29, and its free end is connected to the connecting member 39 via a pin 48. The first blade shaft 44a is inserted through the base end. Are combined. Second swing blade 43b
Is provided in the fourth measuring chamber 32 and has a configuration similar to that of the first swinging blade 43a. A second blade shaft 44b is inserted into and connected to the base end. First and second wing shafts 44a, 44b
Has a vertical axis and is rotatably mounted on the housing 19 about the axis.

The link means 45 includes two pairs of levers 49,
It is configured to include a crankshaft 50 and a pair of valve levers 51, and are mutually pin-coupled. One end (left side in FIG. 5) of the lever 49 is connected to the first and second blade shafts 44a and 44a.
b and the other end is connected to the crankshaft 50.
Is fixed to the adjusting plate 52 fixed to the fixing member. One end of the valve lever 51 is pin-connected to the adjustment plate 52, and the other end is pin-connected to the first and second valve bodies 46a and 46b. First and second valve bodies 46a, 46b
Are provided on the first and second valve seats 33a, 33b so as to be slidable, and open and close the first to third gas flow paths 34a, 34b, 35a, 35b, 36a, 36b by the sliding displacement. The gas is distributed to the first to fourth measuring chambers 29, 30, 31, 32. The displacement of the first and second measuring films 26a, 26b causes the first and second blade axes 44a, 44b to be angularly displaced via the first and second swing blades 43a, 43b. The angular displacement causes the crankshaft 50 to rotate via the lever 49 of the link means 45 and causes the first and second valve bodies 46a and 46b to slide and displace via the valve body lever 51.

Referring again to FIGS. 1 and 2, the temperature correction device 16 includes a temperature detector 53 serving as temperature detection means.
A displacement detector 54 serving as displacement detection means;
A reference temperature setter 58, a microcomputer 56 as arithmetic means, a liquid crystal display 57 as display means,
It includes a display changeover switch 59 and a DC power supply 60.

The temperature detector 53 comprises a temperature sensor 63, a comparison voltage circuit, and a differential amplifier circuit. Temperature sensor 6
Reference numeral 3 denotes a diode, for example, which is attached to the lower inner surface of the front side wall of the lower housing 21. Since the temperature sensor 63 uses the diode characteristic in which the internal resistance changes depending on the temperature, the temperature can be detected based on the output voltage of the temperature sensor. The temperature sensor 63
A wall membrane plate 66 is provided on the side of the first measuring film 26a to regulate the displacement of the first measuring film 26a and protect the temperature sensor 63. The comparison voltage circuit is a circuit that sets two levels of comparison voltages, divides the temperature measurement range into a low range and a high range, and increases the resolution of A / D conversion. In the present embodiment, for example, the low range temperature range is −20 to 20 ° C., and the high range temperature range is 20 ° C.
６０60 ° C. Switching between the low range and the high range is automatically performed based on the output voltage of the temperature sensor 63. The differential amplifier circuit amplifies the difference between the output voltage of the temperature sensor 63 and the comparison voltage.

The displacement detector 54 includes a permanent magnet piece 64 and a displacement detection sensor 65. The permanent magnet piece 64 (hereinafter
The “magnet” is attached to the free end of the first swinging blade 43a and swings with the first swinging blade 43a. As described above, the first swinging blade 43a is connected to the first measuring membrane 2.
Since the magnet 64 is connected to the first measuring film 26a via the connecting member 39, the magnet 64 swings in accordance with the reciprocating displacement of the first measuring film 26a. The displacement detection sensor 65 is, for example, a reed switch, and is provided outside the front side of the first measurement space 28a so as to face the magnet 64 with the front side wall of the lower housing 21 interposed therebetween. The reed switch 65 of the present embodiment is normally in an off state, is turned on by a magnetic flux when the magnet 64 approaches, and returns to an off state when the magnet 64 is separated. Therefore, the reed switch 65 can generate a displacement detection signal of the first measuring film 26a in accordance with the approach of the magnet 64, that is, the approach of the first measuring film 26a. As described later, the gas in the first and second measurement spaces 28a and 28b is sent out each time the first measurement film 26a reciprocates, so that the gas volume can be measured based on the displacement detection signal. As described above, the displacement detector 54 can reliably generate a displacement detection signal indicating the volume of gas with a simple configuration. An outwardly protruding recess 67 is formed in the front side wall of the lower housing 21 sandwiched between the magnet 64 and the reed switch 65 so that collision between the magnet 64 and the side wall is avoided. It is configured.

The box 61 is a metal storage case, which is screwed to the front side of the lower housing 21. The reference temperature setting device 58 is a selection switch provided on the front surface of the box 61, and selectively manually sets a predetermined temperature correction reference temperature. The reference temperature is, for example, 0, 1
5, 20 ° C., usually 20 ° C.

The microcomputer 56 (hereinafter referred to as the microcomputer 56)
The “microcomputer” is, for example, an 8-bit single-chip microcomputer, and performs, for example, temperature correction calculation of the measured gas volume based on the outputs of the temperature detector 53 and the displacement detector 54, as described later. The microcomputer 56 has a memory, and the memory stores a program for the temperature correction. Further, the program incorporates a correction formula for obtaining a correction gas volume by temperature-correcting the measurement gas volume. The correction equation is calculated in advance as follows based on Boyle-Schahl's law and the obtained mechanical measurement error, with a mechanical measurement error of the volume of the measurement gas generated due to the temperature being obtained in advance.

The mechanical weighing error determined in advance is:
It is based on the temperature dependence of the mechanical resistance of the drive train and is expressed as a function of temperature based on a number of experimental results. The mechanical resistance of the driving system is, for example, the deformation resistance of the measuring film 26 and the lubrication resistance of grease. Assuming that the mechanical measurement error is Ts (%) and the temperature of the gas detected by the temperature detector 53 is T (° C.), the mechanical measurement error Ts
Is represented by equation (1). Ts = −0.07T (1)

Since the synthetic rubber measuring film 26 and the grease harden as the temperature decreases, the mechanical resistance increases as the temperature decreases, and the measuring error increases particularly in a temperature region lower than 0 ° C. . Therefore, the mechanical weighing error Ts is calculated only in the temperature range below 0 ° C.,
The gas temperature (60 ° C
In the following range, there are negligible mechanical weighing errors.

If the volume of the gas whose temperature has been corrected based on Boyle-Sharle's law is defined as the intermediate correction gas volume, the intermediate correction gas volume can be obtained by equation (2). Here, in the equation (2), Vm: intermediate correction gas volume (m ³ ),
V: measured gas volume (m ³ ), To: reference temperature (° C.). Equation (2) can be applied to the entire temperature range of the gas temperature T.

[0033]

(Equation 1)

Further, the above-mentioned correction equation indicates that the correction gas volume is Vo
Then, it is expressed by equation (3). Note that the corrected gas volume Vo is a gas volume that has been temperature-corrected based on the Boyle-Shahr's law and the obtained mechanical measurement error. Vo = Vm (1 + Ts) (3)

A liquid crystal display 57 (hereinafter abbreviated as “LCD”) is provided on the front surface of the box 61 and displays a numerical value corresponding to an output signal on the basis of the output of the microcomputer 56. The display changeover switch 59 is, for example, a reed switch, and switches display contents of the LCD 57. The display changeover switch 59 is an internal switch housed inside the box 61 and cannot be seen from the outside. The switching operation of the display changeover switch 59 is performed by pressing a magnet against the front surface of the box 61 to turn on the reed switch. The display contents switched by the display changeover switch 59 will be described later. DC power supply 60
Consists of, for example, a 3V lithium battery, and two lithium batteries are arranged in series. The DC power supply 60 is turned on / off by a power switch 68 provided on the front surface of the box 61. Also, on the front of the box 61,
An external output terminal 69 is provided.
, The output of the microcomputer 56 can be output to the outside. The external output terminal 69 is used, for example, when centrally measuring the usage of gas.

The counter 17 includes a plurality of display reels 74, a plurality of pinions 75, and a counter frame 7.
3 and a gear train (not shown). The display reel 74 is a numeral wheel having numerals 0 to 9 displayed on the outer peripheral surface thereof, and is rotatably supported around a shaft by a shaft bar 76 and is axially supported at intervals. Pinion 75
Are arranged between the display reels 74 in a state of being supported by the shaft bar 77, and the rotation of one display reel 74 is reduced by 1 /
The number is reduced to 10 and transmitted to the other display reel 74. The counter frame 73 is provided on the front side of the upper housing 20 and supports both ends of the shaft bars 76 and 77, respectively.
The rotation of the crankshaft 50 of the gas distribution device 27 is transmitted via a gear train to the display reel 74 indicating the lowest digit of the plurality of display reels 74. The rotation of the display reel 74 is sequentially transmitted to the display reel 74 indicating the upper digit through the pinion 75, and a number corresponding to the rotation is displayed. As described above, since the crankshaft 50 rotates according to the displacement of the measuring film 26, the display reel 74 rotates according to the displacement of the measuring film 26. Therefore, the display reel 74 can mechanically display the integrated value of the volume of gas that has passed through the measuring space, that is, the used amount of gas.

As described above, since the counting counter 17 for mechanically displaying the gas usage is provided, even if a failure occurs in the LCD for electrically displaying the gas usage on the liquid crystal display, the gas usage can be reduced. Weighing can be performed reliably. Therefore, it is possible to avoid a non-metering state in which the usage amount of gas cannot be grasped.

FIG. 6 is a block diagram showing an electrical configuration of the temperature correction device shown in FIG. The temperature sensor 63 sends an output voltage indicating the temperature of the gas to the differential amplifier circuit 79. The comparison voltage circuit 80 sends the set low-range or high-range comparison voltage to the differential amplifier circuit 79. The differential amplifying circuit 79 amplifies the difference between the output voltage and the comparison voltage and sends it to the microcomputer 56. The microcomputer 56 determines whether or not the comparison voltage is appropriate based on the output of the differential amplifier circuit 79, and if not, sets the comparison voltage of the comparison voltage circuit 80 to an appropriate voltage. The displacement detection sensor 65 generates a displacement detection signal and sends it to the microcomputer 56 each time the reciprocating first measuring film 26a approaches. The reference temperature setting device 58 sets a reference temperature, for example, 20 ° C., and sends a setting signal to the microcomputer 56.

The display changeover switch 59 sends a changeover command signal to the microcomputer 56 every time the display content is changed. The first clock generation circuit 83 outputs the output voltage corresponding to the gas temperature to A
/ D conversion clock frequency, for example, 8 MHz
Is sent to the microcomputer 56. The second clock generation circuit 84
For example, a clock frequency (32.768 kHz) for controlling the LCD 57 is sent to the microcomputer 56. The microcomputer 56 calculates the corrected integrated value and the non-corrected integrated value of the gas as described later in response to the respective outputs, and selectively outputs the display contents commanded by the display changeover switch 59 to the LCD 57. Further, the microcomputer 56 sends a pulse signal corresponding to the corrected integrated value to the external output terminal 69. The LCD 57 responds to the output of the microcomputer 56 and displays a numerical value corresponding to the output signal on a liquid crystal display.

FIG. 7 is a flowchart for explaining the operation of the temperature correction device. After the operation starts, step a1
In, the reference temperature is set by the reference temperature setting device 58. The reference temperature is usually set at 20 ° C. In step a2, the gas temperature is detected by the temperature detector 53. In step a3, the gas volume is measured. The gas volume is measured based on the displacement detection signal of the displacement detection sensor 65. As described above, the displacement detection sensor 65 generates a displacement detection signal each time the reciprocating first measuring film 26a approaches. As will be described later, during the first reciprocating movement of the first measuring film 26a, gas corresponding to twice the total volume of the first and second measuring spaces 28a and 28b is sent out. Therefore, the gas volume V can be measured based on the displacement detection signal and the total volume of the first and second measurement spaces 28a and 28b.

In step a4, a correction gas volume is calculated. The calculation of the correction gas volume Vo is performed as follows. (A) When the detected gas temperature T is lower than 0 ° C., the mechanical measurement error Ts is obtained by the above equation (1). (B) Substituting the detected gas temperature T, the obtained measured gas volume V, and the set reference temperature To into the above equation (2) based on Boyle-Scharl's law to substitute the intermediate correction gas volume V
Find m. (C) The corrected gas volume Vo is determined by substituting the determined Ts and Vm into the equation (3).

In step a5, the correction integrated value is calculated by integrating the correction gas volume obtained above. In step a6, the calculation of the uncorrected integrated value is performed by integrating the obtained measured gas volumes. At step a7, display contents are selected. As the display contents, although the corrected integrated value is always displayed,
By operating the display changeover switch 59, the uncorrected integrated value and the gas temperature can be selected and displayed for a certain period of time. At step a8, the selected display content is displayed.
The display is performed by displaying a display control signal from the microcomputer 56 on the LCD 5.
7, and the selected display content is displayed on a liquid crystal display. After the display is completed, a series of operations of the temperature correction device 16 ends.

As described above, the correction of the metered gas volume is performed not only based on Boyle-Charard's law, but also
This is based on a temperature-dependent mechanical metering error.
Therefore, even if the measuring film 26 made of synthetic rubber is cured at a temperature lower than 0 ° C. and its elasticity is reduced, it is possible to correct the measurement error so as to cancel the measuring error caused by the increase in the mechanical deformation resistance. Further, even if the grease hardens at a temperature lower than 0 ° C. and the lubrication resistance increases, the same correction can be made. As a result, the measurement accuracy can be improved as compared with a film-type gas meter that does not consider a mechanical measurement error. Furthermore, since the corrected integrated value and the non-corrected integrated value are selectively displayed on a liquid crystal display, for example, when it is desired to know the amount of gas used for charge calculation, the same non-corrected integrated value as before is displayed, and a more accurate value is displayed. When it is desired to know the gas usage, the corrected integrated value can be displayed. Therefore, it is possible to quickly and reliably grasp accurate information on the gas usage.

In the present embodiment, the temperature correction is performed in consideration of a mechanical measurement error, but the temperature correction may be performed in consideration of another measurement error.

FIG. 8 is a schematic diagram for explaining the gas metering operation of the membrane gas meter with a temperature correction function.
(1) to FIG. 8 (4) are schematic diagrams showing the gas measuring operation in the order of operation. In the state shown in FIG. 8A, the second gas passage 35b is open, and the first gas passage 34b and the third gas passage 36b are connected. by this,
Since the gas from the gas supply port 23 flows into the fourth measuring chamber 32 and the second measuring film 26b is displaced in the direction of the arrow D1, the gas in the third measuring chamber 31 is supplied to the first gas passage 34b and the 3
The gas is discharged from the gas discharge port 24 via the gas flow path 36b. Further, the first measuring film 26a moves to the position where the volume of the second measuring chamber 30 becomes maximum, that is, moves in the direction of arrow C1, and is at the left dead center, and the first to third gas flow paths 34a, 35a, 36a.
Is closed by the first valve body 46a. Therefore, the first measuring chamber 29 is in a state where the gas discharge is completed,
The second measuring chamber 30 is in a state where the inflow of gas has been completed. Further, in this state, since the magnet 64 is closest to the displacement detection sensor 65, a displacement detection signal is transmitted from the displacement detection sensor 65 and sent to the microcomputer 56 of the temperature correction device 16. Note that the operation of the temperature correction device 16 is as described above, and a description thereof will be omitted.

Next, when the first and second valve bodies 46a and 46b are displaced as shown in FIG. 8 (2), the first gas passage 34a is opened, and the second gas passage 35a and the third gas passage 35a are opened. The gas flow path 36a is communicated. As a result, the gas from the gas supply port 23 flows into the first measuring chamber 29, so that the first measuring film 26a is displaced in the direction of the arrow C2, and the gas in the second measuring chamber 30 is changed to the second gas flow. The gas is discharged from the gas discharge port 24 via the path 35a and the third gas flow path 36a. The second measuring film 26b is in a position where the volume of the fourth measuring chamber 32 is maximized, that is, in a state where the second measuring film 26b moves to the arrow D1 direction and is at the left dead center, and the first to third gas flow paths 34b and 35 are provided.
b and 36b are closed by the second valve body 46b.
Therefore, the third measuring chamber 31 is in a state where the gas discharge is completed, and the fourth measuring chamber 32 is in a state where the gas inflow is completed.

Next, when the first and second valve bodies 46a and 46b are displaced as shown in FIG. 8 (3), the first gas passage 34b is opened, and the second gas passage 35b and the third gas passage 35b are connected. The gas flow path 36b is communicated. As a result, the third
Since the gas from the gas supply port 23 flows into the measuring chamber 31, the second measuring film 26b is displaced in the direction of the arrow D2, and the gas pushed out from the fourth measuring chamber 32 passes through the second gas flow path 35b and the second gas flow path 35b. The gas is discharged from the gas discharge port 24 via the three gas flow paths 36b. Further, the first measuring film 26a is connected to the first measuring chamber 29.
At the right dead center after moving in the direction of arrow C2 where the volume of
a, 35a, and 36a are closed by the first valve body 46a. Therefore, the second measuring chamber 30 is in a state where the gas discharge is completed, and the first measuring chamber 29 is in a state where the gas inflow is completed.

Next, when the first and second valve bodies 46a and 46b are displaced as shown in FIG. 8 (4), the second gas passage 35a is opened, and the first gas passage 34a is connected to the third gas passage 34a.
The gas flow path 36a is communicated. As a result, gas from the gas supply port 23 flows into the second
Since the measuring film 26a is displaced in the direction of the arrow C1, the gas pushed out from the first measuring chamber 29 is discharged from the gas outlet 24 via the first gas passage 34a and the third gas passage 36a. . Further, the second measuring film 26b is connected to the third measuring chamber 3
1 is in the position where the volume of the first gas flow becomes the maximum, that is, in the state where it moves in the direction of arrow D2 and is at the right dead center.
4b, 35b, and 36b are closed by the second valve body 46b. Therefore, the fourth measuring chamber 32 is in a state where the gas discharge is completed, and the third measuring chamber 31 is in a state where the gas inflow is completed. Further, when the first measuring film 26a reaches the left dead center after proceeding from the state shown in FIG. 8D, the state returns to the state shown in FIG. 8A, and the same operation is repeated thereafter.

As described above, the first and second measuring films 26a, 26a,
26b repeats reciprocating displacement in the first and second measuring spaces 28a, 28b as shown in FIGS. 8 (1) to 8 (4), while the first and second measuring spaces 28a, 28a,
A gas volume corresponding to twice the total volume of 28b is sent out from the gas outlet 24. Therefore, as described above, the magnet 64 is attached to the first measuring film 26a, and the displacement detecting sensor 65 that generates a displacement detecting signal each time the magnet 64 approaches provides the first measuring film 26a with the first and second measuring spaces 28a and 28b. The volume of gas to be generated can be measured.

FIG. 9 is a graph showing measurement errors of a film-type gas meter having different temperature correction functions in comparison. FIG. 9 (1) is a graph showing the measurement error of a film-type gas meter having a temperature correction function based on Boyle-Scharl law for each gas temperature, and FIG. 9 (2) is a graph with the temperature correction function shown in FIG. 5 is a graph showing the measurement error of the membrane gas meter 14 for each gas temperature. The horizontal axis in FIG. 9 indicates the reference temperature (20
° C), and the vertical axis shows the measurement error. Symbols shown in FIG. 9 are symbols representing gas temperatures, and symbols □, +, ○, Δ, ×, and Δ represent gas temperatures of 60 ° C., 40 ° C., 20 ° C., 0 ° C., −10 ° C., −20 ° C. ° C
Respectively. Further, a straight line U1 in FIG. 9 indicates an upper limit value of a verification tolerance of the measurement method “Gas meter with a built-in temperature conversion device”, and a straight line L1 indicates the lower limit value.

From FIG. 9 (1), it can be seen from FIG. 9 that the measurement error increases as the gas temperature decreases even if the temperature correction based on the Boyle-Sharle law is performed. The measurement error is allowable when the gas temperature is -20 ° C. It can be seen that it is out of the error range.
Also, from FIG. 9 (2), it can be seen that if temperature correction is performed based on Boyle-Sharle's law and mechanical weighing error, the weighing error becomes small and the weighing error falls within the allowable error. Therefore, the measurement error of the membrane gas meter 14 with a temperature correction function of the present embodiment is higher than the measurement error of the membrane gas meter that does not consider the mechanical measurement error. Note that, as described above, when the gas temperature is 0 ° C. or higher, the mechanical measurement error is ignored. Therefore, when the gas temperature is 0 ° C. or higher, the measurement error in FIG. 9 (2) is different from the measurement error in FIG. 9 (1). Are identical.

FIG. 10 is a graph showing measurement errors of the three types of membrane gas meters in comparison. FIG. 10A is a graph showing a measurement error of a film-type gas meter without a temperature correction function, and FIG. 10B is a graph showing a measurement error of a film-type gas meter with a temperature correction function based on Boyle-Scharl's law. 10 (3) is a graph showing a measurement error of the film-type gas meter 14 with a temperature correction function shown in FIG. The horizontal axis of FIG. 10 shows the gas flow rate at the reference temperature (20 ° C.), and the vertical axis shows the measurement error. Ten membrane gas meters are provided, and their data are individually indicated by solid lines in the figure. The measurement errors shown in FIGS. 10 (1) to 10 (3) are calculated under the same conditions, and the gas temperature is −20 ° C.

From FIG. 10 (1), it can be seen that the measurement error is large without the temperature correction when the gas temperature is -20.degree.
From FIG. 10 (3), the temperature correction based on Boyle-Schahl's law significantly reduces the weighing error as compared to the case without temperature correction. It can be seen that the correction reduces the weighing error as compared with the temperature correction based only on Boyle-Scharl law. Therefore, the measurement accuracy of the film-type gas meter 14 having the temperature correction function according to the present embodiment is the same as the measurement accuracy of the film-type gas meter not having the temperature correction function and the film-type gas meter having the temperature correction function based on Boyle-Sharle's law. Higher accuracy than As a result, the film-type gas meter 14 with a temperature correction function according to the present embodiment.
Can be suitably used as a high-accuracy household gas meter.

As described above, in this embodiment, both the corrected integrated value and the non-corrected integrated value are calculated. However, another embodiment of the present invention may be configured to calculate only the corrected integrated value without calculating the non-corrected integrated value. Also, the counting counter 17
Although the LCD 57 and the LCD 57 are both provided, the LCD 57 may be provided without the counter 17. Furthermore, the temperature correction based on the mechanical measurement error may be performed on the industrial impeller gas meter.

[0055]

As described above, according to the present invention, the volume of the gas is corrected based on the detected temperature of the gas, so that the measurement can be performed more accurately than in the past. In addition, the temperature correction can be performed not only for the correction based on Boyle-Schahl's law but also for all weighing errors due to temperature fluctuations. Can be further improved.

Further, according to the present invention, one of the corrected integrated value and the non-corrected integrated value is selectively output.
Accurate information on gas usage can be quickly and reliably grasped.

Further, according to the present invention, the correction of the gas volume is performed not only based on Boyle-Scharle's law but also based on the mechanical measurement error of the gas volume generated by the temperature. The measurement accuracy can be improved as compared with a film-type gas meter that does not consider a mechanical measurement error.

Further, according to the present invention, the displacement detecting means can reliably generate a signal representing the gas volume with a simple configuration.

Further, according to the present invention, since the counting and displaying means for mechanically displaying the gas usage is provided, even if the display for electrically displaying the gas usage has a problem, the gas usage can be reduced. Can be reliably measured. Therefore, it is possible to avoid a non-metering state in which the usage amount of gas cannot be grasped.

[Brief description of the drawings]

FIG. 1 is a simplified front view showing a configuration of a film-type gas meter with a temperature correction function according to an embodiment of the present invention.

FIG. 2 is a side view of the film-type gas meter with a temperature correction function shown in FIG.

FIG. 3 is a simplified front view showing a configuration of a gas meter main body 15 shown in FIG. 2;

FIG. 4 is a side view of the gas meter main body 15 shown in FIG.

FIG. 5 is a plan view of the gas meter main body 15 shown in FIG.

FIG. 6 is a block diagram showing an electrical configuration of the temperature correction device shown in FIG.

FIG. 7 is a flowchart for explaining the operation of the temperature correction device.

FIG. 8 is a schematic diagram for explaining a gas metering operation of the membrane gas meter with a temperature correction function.

FIG. 9 is a graph showing measurement errors of a film-type gas meter having different temperature correction functions in comparison.

FIG. 10 is a graph showing measurement errors of three types of membrane gas meters in comparison.

FIG. 11 is a schematic diagram showing a schematic configuration of a conventional membrane gas meter.

[Explanation of symbols]

 3, 19 Housing 9, 23 Gas supply port 10, 24 Gas outlet 14 Membrane gas meter with temperature correction function 15 Gas meter body 16 Temperature correction device 17 Count counter 26a First measuring film 26b Second measuring film 27 Gas distribution device 28a 1 measurement space 28b 2nd measurement space 29 1st measurement room 30 2nd measurement room 31 3rd measurement room 32 4th measurement room 33a 1st valve seat 33b 2nd valve seats 34a and 34b 1st gas channel 35a and 35b 2 gas flow paths 36a, 36b 3rd gas flow path 43a first swing blade 43b second swing blade 44a first blade shaft 44b second blade shaft 46a first valve body 46b second valve body 53 temperature detector 54 displacement Detector 56 Microcomputer 57 Liquid crystal display 58 Reference temperature setting device 59 Display changeover switch 61 Box 63 Temperature sensor 64 Permanent magnet piece 65 Variable Position detection sensor 73 Counter frame 74 Display reel 79 Differential amplifier circuit 80 Comparison voltage circuit

[Procedure amendment]

[Submission date] January 11, 1999

[Procedure amendment 1]

[Document name to be amended] Statement

[Correction target item name] Claims

[Correction method] Change

[Correction contents]

[Claims]

[Procedure amendment 2]

[Document name to be amended] Statement

[Correction target item name] 0009

[Correction method] Change

[Correction contents]

[0009]

According to the present invention, a gas supply port and a gas discharge port are provided, and a pair of measuring spaces are formed. Further, the gas supply port, each measuring space, and the gas discharge port communicate with each other. And a housing in which a gas flow path is formed, and each of the measuring spaces is provided in each of the measuring spaces, the measuring space is divided into two measuring chambers, and a reciprocating displacement in each of the measuring spaces is caused by a gas pressure difference between the measuring chambers. Membrane, gas distribution means for opening and closing the gas flow path according to the displacement of the measuring membrane and distributing gas to each measuring chamber, temperature detecting means for detecting the temperature of the gas, and the measuring membrane reciprocatingly displaces in the measuring space. And a displacement detection means for generating a displacement detection signal each time, a volume of the gas passing through the measuring space is determined based on an output of the displacement detection means, and the volume of the determined gas is corrected based on an output of the temperature detection means. To determine the correction gas volume, Calculating means for calculating the corrected integrated value by integrating the calculated corrected gas volume, outputting at least the corrected corrected integrated value as a signal, and display means for displaying a numerical value corresponding to the output signal based on the output of the calculating means. Wherein the calculating means integrates the obtained gas volume to obtain a non-corrected integrated value, and selectively outputs one of the obtained corrected integrated value and the obtained non-corrected integrated value. This is a film-type gas meter with a temperature correction function.

[Procedure amendment 3]

[Document name to be amended] Statement

[Correction target item name] 0011

[Correction method] Deleted

[Procedure amendment 4]

[Document name to be amended] Statement

[Correction target item name] 0012

[Correction method] Change

[Correction contents]

Further, since the corrected integrated value can be constantly output and the non-corrected integrated value can be output by selection, it is possible to quickly and surely grasp accurate information on the gas usage.

[Procedure amendment 5]

[Document name to be amended] Statement

[Correction target item name] 0056

[Correction method] Change

[Correction contents]

Since either the corrected integrated value or the non-corrected integrated value is selectively output, accurate information on the gas usage can be quickly and reliably grasped.

Claims (5)

[Claims] 1. A gas supply port and a gas discharge port, and a pair of measuring spaces are formed.
A housing in which a gas flow path communicating with each measuring space and the gas discharge port is formed; and a housing provided in each measuring space, each measuring space is divided into two measuring chambers, and a pressure difference of gas between the measuring chambers is used. A measuring membrane that reciprocates in each measuring space, a gas distribution unit that opens and closes a gas flow path according to the displacement of the measuring membrane and distributes gas to each measuring chamber, and a temperature detecting unit that detects a temperature of the gas; A displacement detecting means for generating a displacement detection signal each time the measuring membrane is reciprocated in the measuring space; a volume of the gas passing through the measuring space based on an output of the displacement detecting means; and an output of the temperature detecting means. Calculating means for correcting the obtained gas volume to obtain a corrected gas volume, integrating the obtained corrected gas volume to obtain a corrected integrated value, and outputting at least the obtained corrected integrated value as a signal; Out of Temperature correcting function membrane type gas meter characterized in that it is configured to include a display means for displaying a numerical value corresponding to the output signal based on. 2. The calculation means calculates an uncorrected integrated value by integrating the determined gas volume, and selectively outputs one of the determined corrected integrated value and the determined non-corrected integrated value. The membrane gas meter with a temperature correction function according to claim 1, wherein: 3. The calculation of the correction gas volume by the arithmetic means is performed by previously calculating a mechanical measurement error of the volume of the gas generated by the temperature, and based on Boyle-Sharle's law and the calculated mechanical measurement error. The membrane gas meter with a temperature correction function according to claim 1, wherein the measurement is performed. 4. The displacement detecting means is connected to the measuring membrane and is displaced in accordance with the displacement of the measuring membrane. The permanent magnet piece is opposed to the permanent magnet piece with the side wall of the housing interposed outside the measuring space. And a displacement detection sensor for generating a displacement detection signal of the measuring film in accordance with the approach of the permanent magnet piece. Membrane gas meter. 5. A display device comprising: a plurality of display reels that rotate according to a displacement of a weighing membrane; and a display means for displaying an integrated value of a volume of gas passed through the weighing space by the display reels. The membrane gas meter with a temperature correction function according to claim 1.