JP4037492B2 - Digital self-recording pressure gauge - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a digital self-recording pressure gauge.
[0002]
[Prior art]
A governor is installed in the middle of a gas conduit supplied to each household, and the gas supply pressure to each household is maintained at a constant pressure by this governor. And it is obliged to record and manage the gas pressure of the entrance side (primary side) and the exit side (secondary side) of this governor.
[0003]
For governor pressure management, a chart paper type self-recording pressure gauge that can record the gas pressure for 7 days has been installed in the past, and the inlet side pressure and the outlet side pressure of the governor are placed on a disk-shaped chart recording paper. The recording is automatically recorded, and the patrol inspector patrols the chart recording paper for collection and inspection once or more per week.
[0004]
[Problems to be solved by the invention]
By the way, recently, the inspection frequency of the above-mentioned governor has been relaxed from “more than once a week” to “more than once a month”.
[0005]
However, in the self-recording pressure gauge that automatically records the supply pressure on the conventional chart recording paper, the size of the recording paper is limited, that is, the recording capacity is not so large. When “1 month” is recorded on the “1 week” chart recording paper, the resolution is lowered and the security level is affected. Therefore, it is difficult to cope with the relaxation of the inspection inspection frequency.
[0006]
Furthermore, since the gas pressure is recorded on the chart recording paper by a mechanical mechanism, it is very troublesome to change the recording paper.
Furthermore, storing the recording paper on which the pressure data is recorded requires a large amount of storage space and management, and the verification and retrieval of the data is not easy, making it difficult to improve the efficiency and labor saving of data management operations. There is also a problem.
[0007]
Accordingly, an object of the present invention is to provide a digital self-recording pressure gauge that solves each of the above problems.
[0008]
[Means for Solving the Problems]
In order to solve the above-mentioned problem, the first invention described in claim 1 is to connect a CPU for storing data, a PC card mounting portion, a connector portion for connecting two pressure sensor cables, and a battery cable. An acquisition device having a connector portion, a battery box containing a dry battery and a current limiting resistor and connected to a cable with a connector, two pressure sensors connected to a cable with a connector, and a PC card,
One of the two pressure sensors is connected to the primary fluid conduit of the governor to detect the fluid pressure, and the other is connected to the secondary fluid conduit of the governor to detect the fluid pressure. Connect the cable with the connector of the pressure sensor to the connector part of the acquisition device in a separable manner, connect the cable with the connector of the battery box to the connector part of the acquisition device in a separable manner, and attach the PC card to the PC card attachment part.
The accumulator and both sensors are driven by the dry battery, and both pressure sensors are driven in a time-sharing manner at a driving cycle of 0.5 seconds according to a program of the CPU, and the measured values of both pressure sensors are stored in the memory of the CPU 27. And
Also, the highest pressure value and the lowest pressure value on the high pressure side and the highest pressure value and the lowest pressure value on the low pressure side for every 3 minutes of the recording cycle are stored, and the generation date and time of these highest pressure value and the lowest pressure value are further recorded. Remember,
When the data for every 3 minutes of the above recording cycle is taken 4 times, the stored data is written and recorded on the PC card mounted in the acquisition device,
The digital self-recording pressure gauge collects the recorded PC card and performs data processing on the personal computer using the PC card.
[0011]
In the present invention, since the PC card is used as the recording medium, the data capacity is larger than that of the conventional recording paper. Therefore, the data quality (resolution) is higher than that of the conventional recording paper, and data can be recorded for a longer period of time than the recording paper. This can ease the inspection inspection frequency.
Further, by using the PC card, the PC card can be collected and data processing such as data verification and search can be performed by the personal computer.
Further, signals from both pressure sensors are electrically transmitted to the acquisition device through a cable with a connector. This eliminates the need for piping work to introduce the fluid conduit directly to the acquisition device.
[0012]
Furthermore, since the acquisition device and the like are driven by a dry battery, a commercial power source is not necessary.
Furthermore, since the cable attached to the power supply box is detachably connected to the acquisition device, the battery of the power supply box can be replaced in a non-hazardous place when the present invention is used for gas pressure detection.
[0013]
Furthermore, even if some accident occurs on the side of the acquisition device, the current is limited by the current limiting resistor, so that, for example, even if the fluid is a gas, the ignition energy is suppressed and it is safe.
[0015]
Further, the drive of both pressure sensors at regular intervals, also since only the required items recorded matters to the PC card, these operation time is shortened. Therefore, even if a dry battery is used as a power source, it operates for a long time.
[0016]
The second invention of claim 2, wherein, in the first aspect, the acquisition device, a liquid crystal display unit for displaying necessary data among the acquired data, and displays operating the liquid crystal display unit display A switch is provided.
[0017]
In the present invention, necessary inspection data can be confirmed on site by a patrol inspector displayed on the liquid crystal display unit of the acquisition device.
[0018]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described based on the examples shown in the drawings.
The embodiment shows an example in which the present invention detects the gas pressure of the high pressure side (primary side) gas conduit and the low pressure side (secondary side) gas conduit of the governor.
[0019]
FIG. 1 shows the digital self-recording pressure gauge of the present invention connected to a gas conduit.
In FIG. 1, a primary side gas conduit 1 that is a high pressure side and a secondary side gas conduit 2 that is a low pressure side are connected via a governor 3, and supply pressure in the secondary side gas conduit 2 by the governor 3. Is held constant.
[0020]
A pressure extraction pipe 4 is connected to the gas conduit 1 on the primary side, and a connector 5 is provided at the tip thereof. Further, a pressure take-out pipe 6 is connected to the secondary side gas conduit 2, and a connector 7 is provided at the tip thereof.
[0021]
The primary side connector 5 is connected to a connector 9 provided in a primary side pressure sensor 8 which is an inlet side pressure sensor, and the secondary side connector 7 is connected to a secondary side pressure sensor 10 which is an outlet side pressure sensor. The connector 11 provided in the is connected.
[0022]
Both the pressure sensors 8 and 10 sense the gas pressure in the gas conduits 1 and 2 connected to each other, and transmit a voltage changing due to the pressure change to the acquisition device 14 side as an electrical signal through the cables 12 and 13. It has become. Further, a primary side connector 15 is attached to the other end of the primary side cable 12, and this is detachably connected to a primary side connector 16 provided in the acquisition device 14. Further, a secondary side connector 17 is attached to the other end portion of the secondary side cable 13, and this is detachably connected to a secondary side connector portion 18 provided in the acquisition device 14.
[0023]
A battery box 19 is detachably attached to the acquisition device 14, and a cable 20 is connected to the battery box 19, and a connector 21 attached to the other end of the cable 20 is provided in the acquisition device 14. The connector portion 22 is detachably connected.
[0024]
The case 14a of the acquisition device 14 is formed with an insertion hole 24 that constitutes a mounting portion for a PC card 23 that is a recording medium, with its lower end opened, and the open / close lid 25 is shown by a chain line in FIG. The PC card 23 can be detachably inserted into the insertion hole 24 from the lower surface of the case 14a.
[0025]
Next, the recording device 14 and the battery box 19 will be described with reference to FIG.
The acquisition device 14 inputs the voltage generated in both the pressure sensors 8 and 10 through both the connector portions 16 and 18, performs A / D conversion by the A / D converter 26, and stores it in the memory of the CPU 27. A liquid crystal display 28 for displaying necessary data among the data stored in the CPU 27, a display switch 29 for displaying and operating the liquid crystal display 28, and a PC card 23 to which the data stored in the CPU 27 is attached. A PC card interface 30 for recording, a communication interface 31, and a communication connector 31a are provided.
[0026]
The screen of the liquid crystal display 28 is configured as shown in FIG. 3. By turning on the display switch 29, the maximum pressure and the minimum pressure within the recording period of the primary side pressure and the secondary side pressure are displayed. The pressure, the generation date and time, the current pressure and the current time can be displayed. The display switch 29 is a display changeover switch, and the data is displayed in a switchable manner by the changeover.
[0027]
The battery box 19 contains a dry battery 32 and a current limiting resistor 33 connected in series with the battery box 19, and the dry battery 32 drives the recording device 14 and the pressure sensors 8 and 10 through the cable 20. The current limiting resistor 33 limits the current and suppresses the ignition energy to the gas even if some accident (short circuit or the like) occurs on the acquisition device 14 side. Further, since the battery box 19 and the acquisition device 14 are separable and the cable 20 is separable from the acquisition device 14 by the connectors 21 and 22, the battery box 19 is taken out to a non-hazardous location away from the gas conduit portion. Battery replacement can be performed.
[0028]
Note that a mounting piece 35 is provided on the case 14 a of the acquisition device 14, and the acquisition device 14 and the battery box 19 are attached to the wall surface of the house by the attachment piece 35.
[0029]
In the above configuration, the pressure sensors 8 and 10 are driven in a time-sharing manner by the program of the CPU 27 in the acquisition device 14. The driving cycle (measurement cycle) is, for example, every 0.5 seconds. The drive time is about 7 ms.
[0030]
By driving the pressure sensors 8 and 10, the gas pressure in the primary gas conduit 1 which is the high pressure side and the gas pressure in the secondary gas conduit 2 which is the low pressure side are detected. The voltage generated in the pressure sensors 8 and 10 is A / D converted by the A / D converter 26 and stored in the memory of the CPU 27. In addition, the recording cycle is set to 3 minutes, and the maximum pressure value and the minimum pressure value on the high pressure side and the maximum pressure value and the minimum pressure value on the low pressure side every 3 minutes are stored, and further, the maximum pressure value and the minimum pressure value are stored. Stores the date and time of occurrence of a value.
[0031]
The stored data is written and recorded on the PC card 23 mounted in the acquisition device 14. This recording is performed every 12 minutes. That is, when data every 3 minutes is taken 4 times, it is written to the PC card 23. With such writing, for example, when a 4 MB PC card is used, the recordable data amount is about six months.
[0032]
The patrol inspector extracts and collects the PC card 23 on which the above data is recorded every predetermined period from the acquisition device 14, reads the data recorded on the PC card 23 into a personal computer, and creates a file on the personal computer side. Change and process the data. In other words, from this read data, data such as checking the presence or absence of pressure abnormalities on the graph display screen, registering data in a hard disk or external MO, etc., or reading data registered in the past, etc. Perform processing and data management.
[0033]
In this way, by processing data on a personal computer, data verification, search, etc. can be speeded up, the details of data in a desired period of 1 hour, 1 day, 1 week, etc. are easy to see, and the response to abnormal data is quick. it can. Also, if a file is created on the acquisition device side, the acquisition device side requires operations such as FAT, file information, etc., which takes time, but by taking the form of data processing on the personal computer side as described above, The operating time on the side of the acquisition device is reduced to 1/3 and the current consumption is reduced, and operation with a dry battery becomes possible in combination with time-division driving to the pressure sensor.
[0034]
Further, the liquid crystal display unit 28 is normally turned off, but is turned on when the inspection inspector switches the display switch 29 of the acquisition device 14 at the site, and the maximum pressure and the minimum pressure within the recording period are displayed. Date and time of occurrence, current pressure and current time can be confirmed.
[0035]
Further, by intermittently driving the pressure sensors 8 and 10 and the recording operation to the PC card 23 to the values as described above, the current consumption is extremely reduced. For example, it is driven for 6 months or more with 4 single batteries. it can.
[0036]
The present invention is not limited to the detection of the gas pressure in the gas conduit as in the above embodiment, but can be applied to the detection of the fluid pressure in other fluid conduits.
[0037]
【The invention's effect】
Above because it, according to the invention of claim 1 Symbol placement, by using a PC card, to record long-term data without reducing the quality of the data as compared with the conventional recording paper, patrol The inspection frequency can be reduced. This can easily cope with the fact that the inspection frequency of the governor is relaxed. Furthermore, since the recording is an electronic system, the measurement accuracy can be improved and the security level can be improved.
[0038]
Furthermore, by collecting the PC card and processing the data on a personal computer, the data analysis, verification, search, etc. can be performed quickly, and the data can be recorded and stored on the personal computer. Can be omitted. Therefore, it can contribute to the efficiency and labor saving of data management work.
[0039]
In addition, since the data can be processed on the personal computer side, file creation and other operations on the acquisition device side are unnecessary, reducing the operating time and current consumption on the acquisition device side, and operating the acquisition device with dry batteries. be able to.
[0040]
Direct plumbing to further the acquisition apparatus is not required, installation costs are less expensive. Furthermore, since the dry battery is used as a power source, the construction is cheaper and the maintenance is simpler than that using a commercial power source. Furthermore, the battery box can be separated from the acquisition unit and the battery can be replaced in a safe place. Further, by providing a current limiting resistor, it is safe even in the case of gas pressure detection.
[0041]
Furthermore, even if a dry battery is used as a power source, it can be operated for a long time.
According to the second aspect of the present invention, the patrol inspector can also confirm necessary data on site.
[Brief description of the drawings]
FIG. 1 is a diagram showing an installation state of a digital self-recording pressure gauge according to an embodiment of the present invention.
FIG. 2 is a block diagram showing a wiring state of the acquisition device section and the battery box section of the present invention.
FIG. 3 is a front view showing an embodiment of a digital self-recording pressure gauge of the present invention.
4 is a bottom view of FIG. 3. FIG.
5 is a right side view of FIG. 3. FIG.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... Primary side fluid conduit 2 ... Secondary side fluid conduit 3 ... Governor 8, 10 ... Pressure sensor 12, 13 ... Cable with connector 14 ... Acquisition device 16, 17, 22 ... Connector part 19 ... Battery box 20 ... Cable with connector 23 ... PC card 24 ... PC card mounting unit 27 ... CPU
28 ... Liquid crystal display

Claims (2)

Incorporates a battery that stores data, a PC card mounting unit, a connector unit for connecting two pressure sensor cables, and a connector unit for connecting a battery cable, and a dry battery and a current limiting resistor. And a battery box connected with a cable with a connector, two pressure sensors connected with a cable with a connector, and a PC card,
  One of the two pressure sensors is connected to the primary fluid conduit of the governor to detect the fluid pressure, and the other is connected to the secondary fluid conduit of the governor to detect the fluid pressure. Connect the cable with the connector of the pressure sensor to the connector part of the acquisition device in a separable manner, connect the cable with the connector of the battery box to the connector part of the acquisition device in a separable manner, attach the PC card to the PC card attachment part
The accumulator and both sensors are driven by the dry battery, and both pressure sensors are driven in a time-sharing manner at a driving cycle of 0.5 seconds according to a program of the CPU, and the measured values of both pressure sensors are stored in the memory of the CPU 27. And
  Also, the highest pressure value and the lowest pressure value on the high pressure side and the highest pressure value and the lowest pressure value on the low pressure side for every 3 minutes of the recording cycle are stored, and the generation date and time of these highest pressure value and the lowest pressure value are further recorded. Remember,
  When the data for every 3 minutes of the above recording cycle is taken 4 times, the stored data is written and recorded on the PC card mounted in the acquisition device,
  A digital self-recording pressure gauge which collects the recorded PC card and performs data processing on the personal computer using the PC card. 2. The digital self-recording pressure gauge according to claim 1, wherein the acquisition device is provided with a liquid crystal display unit for displaying necessary data of the acquired data and a display switch for displaying and operating the liquid crystal display unit. .

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