JPS58173436A - Temperature correcting apparatus of flowmeter - Google Patents

Abstract

PURPOSE:To perform simply and inexpensively highly accurate temperature correction in accordance with the difference of the specific gravity of LPG, by varying the actuation rate to a variable speed gear by adjusting the position of a temperature-displacement conversion part in accordance with the properties of liquid. CONSTITUTION:A rotary sliding plate 19 is supported with a pin 18 of a base board 16 and a temperature-displacement conversion part 20 provided with a temperature sensitive tube 13 is fixed piercing into the plate 19. The plate 19 is attached to a long hole 21 with a lock screw 23. A rotating lever 27 is abutted to a spindle 20a of the part 20 and an actuation element 10a of a variable speed gear 10. Now, when the temperature of LPG is varied, the spindle 20 is actuated and the temperature correction is carried out through the lever 27 by varying the rate of the variable speed of the gear 10. In case the specific gravity of the LPG is different, the plate 19 is approached to an axis 26 and the turning of the lever 27 is made quick at the time when the specific gravity is small and it is actioned reversely at the time when the specific gravity is large. For this reason, the correction of the specific gravity is performed by varying the turning angle of the lever 27 and varying the actuation rate of the gear 10 corresponding to the dimensions of the specific gravity. Hereby, highly accurate temperature correction is performed in accordance with the difference of the specific gravity.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a temperature correction device for a flowmeter used in a measuring machine for liquefied petroleum gas (hereinafter referred to as LPG) for automobile fuel.

LPG is a mixture of globan and butane, and the mixing ratio varies depending on the manufacturer.

In addition, in warmer climates, LPG'i, which has a higher proportion of butane, which is less likely to vaporize but is cheaper, is used, and in colder areas, LPG'i, which is more expensive but has a higher proportion of 7" loban, which is more easily vaporized, is used.

By the way, the specific gravity of the above-mentioned glopan is about 0.51, and the specific gravity of butane is about 0.51. Since it is '58, the specific gravity of LPG as a whole varies slightly depending on the manufacturing company and the region of use.

The volume of LPG changes greatly depending on temperature changes, so the output shaft of the flowmeter is transmitted to the display meter via the transmission, and the LPG
It is necessary to constantly calculate the LPG volume at a standard temperature of 15° C. by appropriately changing the speed change rate of this transmission according to the temperature of the PG.

Conventional weighing machines ignore the above-mentioned difference in the mixing proportions of lopane and butane, and correct the volume change due to temperature based on the specific gravity of LPG at an average mixing ratio (for example, specific gravity 055). Ta.

However, the volume change due to temperature change naturally varies depending on the mixing ratio of propane and butane, that is, the specific gravity and properties of LPG itself, and as a result, the actual specific gravity of LPG is 0.5
If it is 5 or more, less than the actual amount will be displayed, and conversely, if it is 0.55 or less, more will be displayed.

The purpose of the present invention is to eliminate the disadvantages of the above-mentioned conventional example, and to
It is an object of the present invention to provide a simple and inexpensive temperature correction device for a flowmeter that allows highly accurate correction by correcting volume changes due to temperature according to the specific gravity and properties of the flowmeter.

However, according to the present invention, the purpose of this lever is to connect the output shaft of the flowmeter and the display meter via a transmission, and operate the transmission according to the liquid temperature of the fluid to be measured so that the display meter can read the standard temperature. The spraying position of the temperature-displacement converter connected to the temperature sensor that senses the temperature that displays the value converted to flow rate is made variable, and the operating ratio of the temperature-displacement converter to the actuator of the transmission is adjusted depending on the fluid being measured. This is achieved by adjusting the position of the temperature-displacement converting section in accordance with the properties of the temperature-displacement converter.

Embodiments of the present invention will be described in detail below with reference to the drawings.

FIG. 1 is a cross-sectional view of an LPG weighing machine using the temperature correction device of the present invention, and there is an LPG storage tank (not shown) in the exterior 1.
A refueling bong 13 and a flow meter 4t are provided in the refueling pipe 2 communicating with the refueling pipe 2, and a nozzle valve 6 is attached to the tip of the refueling pipe 2 via the refueling hose 5.

Further, a nozzle hook 7 for hanging the nozzle pulp 6 is provided on the side surface of the outer device, and a refueling motor 8 is connected to the refueling pump 13.

9 in the figure is the flow rate output shaft installed in the flow meter 4, and this output shaft 9
is connected to a refueling amount indicator 11 provided on the front of the external device via the transmission lO.

The above-mentioned transmission 1O is, for example,
When the rotary drum is rotatably supported and whose rotation is output as shown in the figure, it is installed concentrically with the drum so that it can freely move by 1"+1, and the rotational speed in a predetermined direction is greater than that of the drum. The system houses a plurality of free wheels that engage with the drum and move integrally with it, and each of the free wheels is arranged so that it does not interfere with the other free wheels, and the phases are shifted from each other. A continuous rotation ratio changing mechanism can be used in which a pin is fixedly installed and the pin is engaged with a pin guide bay provided in a phase-shifted manner on an eccentric rotary plate that is eccentrically moved by the movement of an adjustment lever.

A temperature correction device 12 of the present invention, which will be described later, is connected to this transmission 10, and the end of the temperature sensing tube 13 of the correction device 12 is connected to a temperature sensing portion I4 formed in the oil supply pipe 2 before the flow meter 4. let

FIG. 2 is a front view showing an embodiment of the temperature-correcting device 12 of the present invention, FIG. 3 is a cross-sectional view of the same, and FIG. 4 is a line A-A in FIG. 3.
In the figure, 15 indicates a base made of a flat plate, and a substrate 16 is fixed at right angles to the base 15 using holes 17 and 17', and one end of the substrate 16 is attached to a shaft with a bottle I8. Attach the supported rotary sliding plate 19.

This rotary sliding plate 19 has a fan shape centered on the bottle 18 portion, and a cylindrical temperature-displacement converter 20 is fixedly connected to this rotating sliding plate I9.

The temperature-displacement converter 20 houses a bellows (not shown) that expands and contracts in communication with the temperature sensing tube 13, and has a spindle 20α protruding from the front end that is operated by the bellows. The rear portion of the portion 20 has a curved length (121) centered on the bottle 18 provided on the substrate 16, and projects to the back of the substrate 16.

As the sliding plate 19 rotates, the curved elongated hole 21 converts into a converting portion 20.
An arcuate long hole 22 concentric with the long hole 21 is formed in the substrate 16 above the long hole 21, and the setscrews 23 and 23' of the sliding plate 19 are inserted through the long hole 21. and throat.

A pointer 24 is provided at the upper end of the sliding plate 19, and a scale 25 indicating the specific gravity of LPG is written on the substrate 16 side.

A shaft 26 is erected on the base 15 in parallel with the substrate 16, and supports an L-shaped rotary lever 27, and one end of the lever 27 is brought into contact with the actuator 10G of the transmission 10. The other end is provided with a flat portion 27α, against which the tip of the spindle 20α is brought into contact.

Next, the usage and effect will be explained.

When the motor 8 is started, the refueling bonder 3 is rotated, and the nozzle pulp 6 is removed from the nozzle hook 7 for refueling, the flow meter 4 rotates and measures the amount of refueling, and the simultaneous rotation of the flow meter 4 is the flow output. It is transmitted to the oil supply amount indicator 11 via the shaft 9 and the transmission 10.

The rotating lever 27 rotates around the shaft 26 when the spindle 20α pushes the flat part 27α, and the other end is connected to the transmission 1.
This is to press actuator 1()α of ().

On the other hand, if the degree of suppression of the actuator 10α is different, the device IO
The speed change rate also changes.

The temperature change in the LPG detected by the temperature sensor 14 in this way is converted into a mechanical movement of the spindle 20α by the temperature-displacement converter 20, and is transferred to the transmission device IO via the lever 27.
The transmission device i t'o changes the rotational speed of the output shaft 9, and the amount converted to the standard temperature is displayed on the display meter 11.

Check the actual specific gravity of LPG and set the set screws 23, 23'.
is loosened and the sliding plate 19 is rotated around the pin 18, so that the spindle 2oα of the temperature-displacement converter 20 hits a position close to the shaft 26 of the lever 27 when the value on the finger scale 25 is as small as 0.51, for example. As the value increases, the spindle 20α abuts the lever 27 farther from the axis 26.

Therefore, when the scale value is 0.51, the rotation angle of the lever 27 is large and the degree of suppression on the actuator 10α is also large.

As the scale value increases, the suppression on the actuator 10α becomes smaller. For example, if the volume change due to a 1°C temperature change of ro, 51 made in the transmission 10 is 0.3%, then at γ0.57, the temperature change is 1"C. The volume change due to this is 0.2 inches.

When the pointer 24 is aligned with the scale 25, set screw 23°2
3' to fix the position of the sliding plate 19, this state is maintained.

As described above, the temperature correction device of the present invention connects the output shaft of the flowmeter and the display meter via a transmission, operates the transmission according to the liquid temperature of the fluid to be measured, In a temperature correction device for a flowmeter that displays a value converted into a flow rate of temperature in degrees, the mounting position of the temperature-displacement converter connected to the temperature sensor that senses the liquid temperature of the fluid to be measured is movable, and the The operating ratio of the temperature-displacement converter to the actuator is
The temperature to be measured (H) can be varied by adjusting the position of the converter according to the properties of the fluid to be measured, so accurate temperature correction can be performed in accordance with the difference in specific gravity of the actual fluid to be measured with a simple and inexpensive structure. It is something that

[Brief explanation of the drawing]

Fig. 1 is a longitudinal sectional front view of an LPG weighing machine using the temperature correction device of the present invention, Fig. 2 is a front view of an embodiment of the temperature correction device of the present invention, and Fig. 3 is a cross-sectional view of the same. Figure 4 is a view taken along line A-A in Figure 3. Exterior 2.
...Oil supply pipe 3 ...Oil supply bonder 4.
...Flowmeter 5 ...Refueling hose 6.
・・・・・・Nozzle pulp 7・・・・・・Nozzle hook
8...Refueling motor 9...Flow rate output shaft 10...Transmission device 10α...
Actuator 11...Display meter 12...
・Temperature correction device 13...Temperature sensing tube 14・
...Temperature sensing section 15 ... Base 16
・・・・・・Substrate 17, 17'...
...Bolt 18...Pin 19...
...Rotating sliding plate 20...Temperature-displacement converter 2oα...
・Spindle 21... Curved long hole 22.
...Elongated hole 23, 23'...Set screw
24... Pointer 25... Scale
26... Own... Axis 27... Rotating lever 2
7α・・・Plane part applicant Tokyo Tatsunoo Co., Ltd. 1 picture tusk 2 picture

Claims (1)

[Claims] +17 The output shaft of the flowmeter and the display meter are connected via a transmission device 1, and the transmission device is operated according to the liquid temperature of the fluid to be measured to cause the display meter to flow at a standard temperature. In the temperature correction device of the flowmeter that displays the converted value 1, the temperature-displacement conversion section connected to the temperature sensing section that senses the liquid temperature of the fluid to be measured is installed at Kanamachi change and the temperature-displacement converter is moved to the operating position r of the transmission. A temperature correction device for a flowmeter, which is characterized by a change in temperature. (2) Temperature-displacement conversion The contact position of the spindle and the actuator of the transmission changes [ii1
A temperature correction device for a flowmeter according to claim 1, which is connected by a rotating lever.