JP2907374B2 - Self-recording pressure gauge for gas leak detection - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a self-recording pressure gauge for detecting a gas leak which is suitable for use in a gas leak detection system or the like in household gas supply equipment.

[0002]

2. Description of the Related Art As a conventional self-recording pressure gauge for detecting gas leakage, there is known a pressure gauge used in a gas leakage detection system as shown in FIG. This gas leak detection system 6
Reference numeral 0 denotes a main pressure regulator 62 provided in the main pipe 61, a branch pipe 63 branched from the main pipe 61 and bypassing the main pressure regulator 62, and a sub-pressure regulator 6 provided in the branch pipe 63.
4 and a self-recording pressure gauge 65 for detecting gas leakage, which is attached to the auxiliary pressure regulator 64.

[0003] An LP gas cylinder 66 is provided upstream of the main pipe 61 as a gas supply source. Gas supplied from the LP gas cylinder 66 is supplied to the main pipe 62 by a header pipe 67. Downstream of the main pipe 62, an apartment house 68
A branch pipe 69 branching for each room is connected via a branch valve 70, and each gas appliance 73 is connected to the downstream side of each branch pipe 69 via a main valve 71 and a gas meter 72. I have. At the connection between the header pipe 67 and the main pipe 61, an automatic switching regulator 74 is provided.
1 is adjusted within a predetermined range.

[0004] In the gas leak detection system 60, when a large amount of gas is used in the supply destination apartment house 68, the main pressure regulator 62 is opened to supply gas to the downstream side. However, during the time when gas usage is low, such as at night, the valve is closed and the supply of gas is stopped.
4 gas to the downstream side of the main pipe 6 4 through branch pipes while adjusting the flow rate is supplied at. Furthermore, if there is no amount of gas, by-pressure regulator 6 4 becomes a closed state.

A self-recording pressure gauge 65 for detecting gas leakage provided in the sub-pressure regulator 62 automatically records the differential pressure between the upstream side and the downstream side of the sub-pressure regulator 62. the analyzes the flow rate of the gas flowing in the sub-pressure regulator 6 4 by converting the flow rate, of course in situations where the gas does not seem to be used, determined that there is a possibility of leakage if the gas is flowing It is something to do.

The conventional gas leak detecting self-recording pressure gauge 65 includes a recording needle whose pen point is pressed against a rotatably supported recording paper, and the recording needle which is moved in accordance with the magnitude of the measured pressure. Pressure conversion means for moving in the radial direction of,
And a clock body that continuously rotates the recording paper at a constant speed throughout the day, and automatically records the loss pressure change (that is, supply flow rate change) as a line graph on the recording paper.

[0007]

In the above-mentioned conventional pressure gauge for detecting gas leakage, a line graph of a change in the measured flow rate indicates a time zone (midnight) in which gas is considered not to be used within one day. The gas supply amount is read during a period of time, and when a flow rate exceeding a certain amount is recognized for a long period of time, it is determined that gas leakage has occurred. However, the recording paper is continuously rotated at a constant speed throughout the day. Therefore, the flow rate is recorded until the time when gas is usually used. Therefore, there is a problem that the recording paper is consumed unnecessarily and the recording paper must be replaced in a short time. For example, if the recording paper is rotated at a speed of 1/2 rotation per day, the recording paper must be replaced every two days.

The present invention has been made in view of the above-mentioned circumstances, and has as its object to provide a gas leak detection self-recording pressure gauge capable of automatically recording pressure only during a time period when recording is necessary and saving recording paper. I have.

[0009]

In order to solve the above-mentioned problems, according to the first aspect of the present invention, even after a main pressure regulator for adjusting a gas flow rate of a main pipe is closed, the main pressure is regulated. A self-recording pressure gauge for gas leakage detection, which automatically records the differential pressure between the upstream side and the downstream side of a sub-pressure regulator that adjusts the flow rate of minute gas in a branch pipe that bypasses the device. A pressure gauge, a recording needle having a pen point pressed against rotatably supported recording paper, pressure conversion means for moving the recording needle in a radial direction of the recording paper in accordance with the magnitude of a measured pressure, and A clock that rotates the paper only during a limited time period of the day , wherein the clock is
Teeth are formed on a part of the outer circumference corresponding to the length of the band,
Rotated at a speed of one rotation per day due to the restoring force of the spring
A drive gear that is driven to rotate, and connected to a rotation shaft of the recording paper.
And a driven gear meshing with the drive gear .

[0010]

[0011]

[0012]

According to the first aspect of the present invention, the timepiece rotates the recording paper only during a limited time period of the day. For this reason, the recording paper is rotated only in the time period when recording is necessary, and a line graph (in which the magnitude of the pressure is a coordinate in the radial direction) drawn on the recording paper by the recording needle is displayed only in the time period necessary for recording. Pressure change data is obtained.

According to the second aspect of the present invention, the drive gear rotates at a speed of one rotation per day due to the restoring force of the mainspring, and the teeth formed on a part of the outer periphery of the drive gear mesh with the driven gear. Since only the driven gear is driven, the recording paper rotates in a mechanical configuration only during the time period when recording is necessary, and data on the pressure change only during the necessary time period can be obtained.

Further, according to the third aspect of the present invention, the recording paper is rotated only for a limited time period in a day by an electric control means such as a transmitter, an intermittent timer, and an arithmetic circuit. Only the time zone required for recording is recorded, and once the timer is set, the recording hand rotates in the required time zone for a long period of time, and various setting conditions can be incorporated in advance according to the situation.

[0015]

Next, an embodiment of the present invention will be described with reference to the drawings.

FIG. 1 is a side view showing the entire configuration of a self-recording pressure gauge for detecting gas leakage according to the first embodiment, and FIG. 2 is a side view showing the internal configuration of a clock body in the self-recording pressure gauge for detecting gas leakage. 3 and 4 are plan views showing components of the timepiece. Gas leak detection autographic pressure meter of the present embodiment is intended to be used in the gas leakage detection system 60 shown in FIG. 7, an automatic differential pressure between the upstream side and the downstream side of the auxiliary pressure regulator 6 4 It is to be recorded. The description of the gas leak detection system 60 is the same as that of the related art.
The description is omitted in this embodiment. As shown in FIG. 4, a self-recording pressure gauge 1 for detecting gas leakage according to the present embodiment has an upper case 2 and a lower case 3
, A closed container is formed, and a connection port 4 for connecting a measurement pressure input pipe is formed at the bottom of the lower case 3. A bellows 5 that expands and contracts up and down in accordance with the magnitude of the measured pressure is provided above the connection port 4, and a pressure transmission shaft 6 that transmits the displacement of the bellows 5 to the expansion gear 7 as a rotational motion is attached. Further, a slide gear 8 arranged in a horizontal direction is meshed with the expansion gear 7, and moves in the horizontal direction according to the rotation of the expansion gear 7. A recording needle 9 is fixed to an end of the slide gear 8, and the recording needle 9 is urged by a spring 9a and its pen tip is pressed against a recording paper 10 formed in a disk shape. The recording paper 10 is mounted on a clock body 20 fixed to the ceiling of the upper case 2 so as to be horizontally rotatable, and is driven to rotate.

Here, the bellows 5, the pressure transmission shaft 6,
The expansion gear 7 and the slide gear 8 move the recording needle 9 in the radial direction of the recording paper 10 by a moving amount according to the magnitude of the measured pressure, and constitute a pressure conversion unit 15 of the present invention. In the recording paper 10, as shown in FIG. 5, a concentric flow scale 10a is provided along the circumferential direction on the disk-shaped surface, and the time scale 10 is radially orthogonal to the flow scale 10a.
b is attached. In the case of this embodiment, the flow rate scale 1
0a is scaled from 11 / h to 61 / h from the center outward, and time scale 10b is scaled for 4 hours.
It is attached to each angle range of 0 degrees.

Next, the configuration of the timepiece 20 will be described with reference to FIGS. The clock body 20 is shown in FIG.
As shown in FIG.
The recording paper 10 mounted on a recording paper plate 24 is rotated around a support shaft 25. The mainspring 26 serves as a drive source, and a mainspring shaft 27 on which the mainspring 26 is mounted and The mainspring case 28,
A lever 29 for winding the mainspring 26 and a small gear 30 for transmitting the rotation of the lever 29 to the mainspring case 28
A drive shaft 34 to which the rotation of the mainspring shaft 27 is transmitted by the large gear 32 and the small gear 33; a drive gear 35 and a driven gear 36 to transmit the rotation of the drive shaft 34 to the support shaft 25; An escapement gear 37, an engagement lever 38, a hairspring 39, and a balancer 40 that constitute the machine;
Large gears 41 and 42 and small gears 43 and 44 for transmitting the rotation of the drive shaft 34 to the escape gear 37 are provided.

The drive gear 35 rotates once in 24 hours together with the drive shaft 34 by the action of the escapement. As shown in FIG. 3, the drive gear 35 corresponds to, for example, four hours (１ ／ rotation). The teeth (for example, five teeth) are formed on a part of the outer circumference only in the angle range, and the other part of the outer circumference has an outer diameter that does not interfere with the teeth of the driven gear 36. Further, the driven gear 36 is formed with teeth that mesh with the teeth of the drive gear 35 on the entire circumference. In this case, for example, the pitch diameter (the number of teeth 60) is twice as large as the drive gear 35. As shown in FIG. 4, the escapement is driven by the engagement lever 38, which is stably vibrated by the hairspring 39 and the balancer 40, sequentially engaging the teeth of the escapement gear 37. 34 is rotated substantially at a constant speed (1 rotation / 24 hours) by the restoring force of the mainspring 26.

Next, the operation of the self-recording pressure gauge for detecting gas leakage with the above-described configuration will be described. When the measurement pressure is applied to the connection port 4, the pressure conversion means 15 moves the recording needle 9 in the radial direction of the recording paper 10 according to the magnitude of the measurement pressure. Paper 1
A line graph of the pressure change is drawn on zero. In the timepiece 20, the drive gear 35 is rotated at a constant angular velocity by the action of the escapement due to the restoring force of the mainspring 26, and the teeth formed on a part of the outer periphery of the drive gear 35 mesh with the driven gear 36 (this period). In this case, the driven gear 36 is driven only for 4 hours, and in this period, the driven gear 36 has five teeth (that is, 1/1) in this case.
(2 rotations). For this reason, the recording paper 10 makes 1/12 rotation for 4 hours out of 24 hours, and the recording paper 1
By setting the starting position to 0, only the pressure change (flow rate change) from midnight to 4:00 at midnight is automatically recorded as a line graph in the 30-degree angle range of the recording paper 10 as indicated by reference numeral 10c in FIG. be able to.

Accordingly, the self-recording pressure gauge for detecting gas leakage according to the present embodiment can be used for automatic recording of the supply flow rate in the gas leakage detection system, and can record for 12 days with one sheet of recording paper 10. Saving paper 10 and recording paper 1
0 can be extended. In addition, since the self-recording pressure gauge for detecting gas leakage uses the clock body 20 having only a mechanical configuration, there is a feature that it is not always necessary to use an explosion-proof structure in order to ensure safety of gas equipment.

Next, a second embodiment of the present invention will be described. FIG. 6 is a block diagram showing the configuration of the timepiece according to the second embodiment. Note that the configuration of the parts other than the timepiece is the same as that of the first embodiment, and a description thereof will be omitted. As shown in FIG. 6, the timepiece body 50 of the present embodiment requires a battery 51 as a power source, a drive mechanism 52 such as an electric motor connected to the rotating shaft of the recording paper 10 (directly connected in this case), and recording. And control means 53 for operating the drive mechanism 52 only during a short time period. Control means 53, in this case oscillator 54, the intermittent timer 55, the arithmetic circuit outputs a control signal of the driving mechanism 52 based on the output signal of the oscillator 54 and the intermittent timer 55 5
6

Next, the operation of the self-recording pressure gauge for detecting gas leakage having the above-described configuration will be described. The control means 53
Since the electric motor 52 connected to the rotating shaft of the recording paper 10 is operated only during a limited time period, the recording paper 10 is rotated in an electrical configuration only during the time period when recording is necessary. Similarly, data of pressure change only in a necessary time zone can be obtained, so that the recording paper 10 can be saved and the replacement period of the recording paper 10 can be extended.

[0024]

As described above, according to the first aspect of the present invention, the recording paper is rotated only in the time zone where recording is necessary, and data on the pressure change only in the required time zone can be obtained.
It is possible to save the recording paper and extend the replacement period of the recording paper.

In addition, the self-recording pressure gauge for detecting gas leakage has an explosion-proof structure in order to ensure the safety of the gas equipment, since the timepiece is constituted only by a mechanical structure.

[0026]

[Brief description of the drawings]

FIG. 1 is a side view showing an overall configuration of a first embodiment of the present invention.

FIG. 2 is a side view showing the internal configuration of the timepiece according to the first embodiment of the present invention.

FIG. 3 is a plan view showing components of the timepiece according to the first embodiment of the present invention.

FIG. 4 is a plan view showing components of the timepiece according to the first embodiment of the present invention.

FIG. 5 is a plan view showing a recording sheet according to the first embodiment of the present invention.

FIG. 6 is a block diagram showing a configuration of a timepiece according to a second embodiment of the present invention.

FIG. 7 is an explanatory diagram illustrating an outline of a gas leak detection system using a self-recording pressure gauge for gas leak detection according to the related art and the present invention.

[Explanation of symbols]

 REFERENCE SIGNS LIST 9 recording needle 10 recording paper 15 pressure conversion means 20, 50 clock body 26 mainspring 35 drive gear 36 driven gear 61 main pipe 62 main pressure regulator 63 branch pipe 64 auxiliary pressure regulator

Claims (1)

(57) [Claims] 1. An upstream side of a sub-pressure regulator for regulating a small gas flow rate in a branch pipe bypassing the main pressure regulator even after a main pressure regulator for regulating a gas flow rate of a main pipe is closed. A self-recording pressure gauge for gas leakage detection that automatically records the differential pressure between the gas pressure and the downstream side, the recording needle having a pen tip pressed against rotatably supported recording paper, comprising a pressure transducer means for moving the recording needle in accordance with the magnitude of the measured pressure in the radial direction of the recording paper, and a timepiece to rotate only limited hours part of the day the recording paper, this The watch body has an outer circumference corresponding to the length of the time zone
Is formed in a part of the tooth, and the spring has a restoring force to
A driving gear that is driven to rotate at a speed of one rotation per day;
A driven gear connected to the rotating shaft of the recording paper and meshing with the drive gear
A self-recording pressure gauge for detecting gas leakage, comprising a gear .