JP3461419B2 - Automatic liquid supply stop device - Google Patents

Description

Description: BACKGROUND OF THE INVENTION [0001] 1. Field of the Invention [0002] The present invention relates to an apparatus for transferring liquid, and more particularly to a liquid supply which automatically stops when a liquid filled in a container reaches a predetermined level. It relates to an automatic stop device. [0002] When transferring kerosene from a petroleum plastic tank to a cartridge tank of a heater, the oil is supplied using a manual extraction pump or the like, but the pump is promptly checked while looking at a gauge attached to the cartridge tank. Without stopping the feed, there was a risk of overflow. So the inventor
There has been proposed a liquid supply automatic stop device having a simple configuration capable of automatically stopping liquid supply at a set liquid level without monitoring the kerosene injection state as described in Japanese Patent Application Laid-Open No. 7-239049. A conventional liquid supply automatic stop device 1 shown in FIG.
01 is a liquid supply pipe 10 connected to a liquid inflow pipe 102.
3, a discharge pipe 105 attached to the opening 104a of the liquid receiving container 104, and an exhaust pipe 107 inserted through the inside of the discharge pipe 105 to connect the upper end to the exhaust adjustment section 106. In 106, an exhaust hole 106f was formed in the upper part of the cylindrical body 106a, and a floating valve body 110 was loosely inserted therein. [0004] Since the opening 104 a of the liquid receiving container 104 is sealed with a plug 108, the air in the container compressed at the time of injection is discharged to the outside through an exhaust pipe 107 through an exhaust pipe 107 through an exhaust pipe 107. However, when the liquid level gradually rises and the lower end of the exhaust pipe 107 is immersed in the liquid 113, the liquid cannot be exhausted.
When 3 flows in, the space inside the container decreases, and the internal pressure increases. The liquid 113 which rises in the exhaust pipe 107 by receiving the internal pressure pushes up the valve body 110 to close the exhaust hole 106 f, and balances the water head pressure of the discharge pipe 105 and the internal pressure in the liquid receiving container 104 with the liquid 113. Was designed to stop the inflow of water. After confirming the completion of the liquid supply, the tube 10
2 is shut off, and the plug 108 is inserted into the port 104 of the container.
a by operating the button 111 while removing the valve 1
10 to open the exhaust hole 106f, and
3. Liquid 1 remaining in discharge pipe 105 and exhaust pipe 107
13 was discharged into the liquid receiving container 104. [0006] The liquid supply automatic stop device 101 is a container 1
Since the valve body 110 is operated by using the internal pressure rise in the valve 04, a complicated mechanism such as a solenoid valve and a control circuit is not required.
It was a simple device suitable for subdividing liquids such as kerosene at home. [0007] However, the conventional liquid supply automatic stop device 101 has a structure in which the valve body 11 of the exhaust adjustment unit 106 is provided.
0 is pushed up to close the exhaust hole 106f, and the discharge pipe 105
The head 113 and the internal pressure in the liquid receiving container 104 are balanced to stop the flow of the liquid 113.
When the operation failure of No. 10 occurs, there is a possibility that the liquid supply may not be stopped. That is, when dust or the like is mixed in the liquid 113 flowing into the cylinder 106a, the floating of the valve body 110 is hindered, or dust is caught between the valve body 110 and the exhaust hole 106f. There was a possibility that the exhaust hole 106f could not be completely closed and the liquid 113 would eventually overflow. [0008] The liquid supply automatic stop device 100 includes:
In order to apply to a liquid receiving container 104 having a small hole diameter, an exhaust pipe 10
7 is inserted, but if the pipe diameters of the discharge pipe 105 and the exhaust pipe 107 are not balanced, there is a disadvantage that the liquid supply is not performed smoothly. Further, the liquid 11 is stored in the tube 102 after the liquid supply is completed.
If 3 remains, liquid re-inflow may occur unless the liquid inflow into the tube 102 is shut off before the sealing of the plug 108 is released. [0010] The present invention solves the above-mentioned problems, and can smoothly supply liquid even in a liquid receiving container having a small aperture.
In addition, the operation of the exhaust adjustment unit does not occur, and even when dust or the like is mixed in, the supply of liquid at the set liquid level can be reliably stopped, and the plug can be shut off without shutting off the liquid inlet tube. It is an object of the present invention to provide a liquid supply automatic stop device that does not cause re-inflow when opened. [0011] In order to solve the above problems SUMMARY OF THE INVENTION The liquid supply automatic stop device of the present invention, a liquid discharge port at a lower end portion inserted through the plug body for sealing the mouth hole of the liquid receiving container
And a discharge pipe connected to the liquid inlet side pipe body,
In a liquid supply automatic stop device having an exhaust pipe that penetrates the inside of the discharge pipe and projects a lower end part to a depth lower than a set liquid level in the container and connects an upper end part to an exhaust adjustment unit, the exhaust pipe includes: The liquid discharge port has an inner space cross-sectional area that suppresses an increase in pressure in the container during liquid supply, and the liquid outlet is higher than the set liquid level.
It is opened at a high position and its opening area is
Is set to be larger than the inner cross-sectional area of the, the exhaust adjustment unit,
A narrow tube having an inner cross-sectional area substantially equal to the exhaust pipe and extending at least to a height exceeding the supply-side liquid surface, and an effective discharge cross-sectional area obtained by subtracting an occupied cross-sectional area of the exhaust pipe from an inner hollow cross-sectional area of the discharge pipe. Is substantially the same as the inner cross-sectional area of the liquid inlet tube. The discharge pipe has a liquid outlet at the lower end, and its opening area is larger than the inner cross-sectional area of the liquid inlet side pipe. In addition, the inner cross-sectional area of the thin tube is determined so that the liquid falls naturally when the sealing of the stopper is released. The liquid flowing from the liquid inlet tube is injected into the liquid receiving container from the discharge pipe. Since the opening of the liquid receiving container is sealed with a stopper, air in the container at the time of injection is discharged to the outside via an exhaust pipe. At this time, if the amount of liquid inflow and the inner cross-sectional area of the exhaust pipe are balanced, no increase in the pressure in the container is observed. When the liquid level gradually rises, the lower end of the exhaust pipe is immersed in the liquid and cannot be exhausted. Further, when the liquid flows in from the discharge pipe, the gap in the container decreases, and the internal pressure rises rapidly. In response to the increase in the internal pressure, the liquid rises in the thin tube through the exhaust pipe. When this liquid level reaches the supply-side liquid level, the head of the liquid in the discharge pipe and the exhaust pipe and the air pressure in the container become equal, and the movement of the liquid stops. When an appropriate cross-sectional ratio between the exhaust pipe and the discharge pipe is selected, compressed air in the container flows into the discharge pipe from the liquid discharge port, and discharges the liquid in the liquid inlet tube and the liquid in the discharge pipe into the container. Can eliminate the liquid supply pressure.
In this case, the re-inflow from the supply side does not occur at the time of releasing the sealing of the plug body even if the liquid inlet side tube is not shut off.
Further, the liquid in the thin tube and the exhaust pipe flows down from the lower end when the plug is opened, but since the volume is small, no liquid overflows. Next, an embodiment of the present invention will be described in detail with reference to the accompanying drawings. FIG. 1 is a longitudinal sectional view showing a configuration of a liquid supply automatic stop device of the present invention, and FIG. 2 is an explanatory diagram of a method of using the liquid supply automatic stop device. The liquid supply automatic stop device 1 includes a discharge pipe 3 connected to the liquid inflow side pipe 2,
A plug body 5 that tightly inserts the discharge pipe 3 and seals the opening 4a of the liquid receiving container 4 and an exhaust pipe 7 that penetrates the inside of the discharge pipe 3 and connects the upper end to a thin tube 6 that is an exhaust adjustment section. Have. The liquid inlet side pipe 2 shown in FIG. 2 is a discharge hose of a manual extraction pump 9 mounted on the oil storage tank 8, but may be a connecting pipe with a shut-off valve directly connected to the oil storage tank or the like. Also in this case, the liquid 10 such as kerosene flows down due to the head difference. The exhaust pipe 7 has a set liquid level height 10 of the liquid receiving container 4.
The lower end protrudes to a position slightly lower than a, and the thin tube 6 connected thereto extends to at least a height exceeding the supply-side liquid level 10b. The liquid 10 flowing from the liquid inlet tube 2 by operating the extraction pump 9 flows into the discharge pipe 3 and is injected into the liquid receiving container 4 from the liquid outlet 3a. Since the opening 4a of the liquid receiving container 4 is sealed with the stopper 5, air in the container compressed at the time of the injection passes through the exhaust pipe 7 and the narrow pipe 6a.
It is discharged to the outside. The inner cross-sectional area of the exhaust pipe 7 and the narrow pipe 6 is determined so that the pressure inside the container does not increase as much as possible during the evacuation and that the liquid 10 falls naturally when the sealing of the plug 5 is released. In order to supply the liquid smoothly, the discharge pipe 3 is designed so that its inner space becomes equal to the sum of the inner cross-sectional area Sd0 of the liquid inlet tube 2 and the occupied cross-sectional area SD2 of the exhaust pipe 7. The sectional area Sd1 is determined, and the opening area of the liquid discharge port 3a is set to be larger than the inner sectional area Sd0 of the liquid inflow side tube 2. When the liquid level gradually rises, the lower end of the exhaust pipe 7 is immersed in the liquid 10 and cannot be exhausted. Thereafter, when the liquid 10 flows from the discharge pipe 3, the space inside the container is reduced, and the internal pressure is increased. The exhaust pipe 7 receives the increase in the internal pressure.
And the liquid 10 rises in the capillary 6. When the liquid level reaches the supply-side liquid level 10b, the head of the discharge pipe 3 and the exhaust pipe 7 and the air pressure in the container become equal, and the movement of the liquid 10 stops. The compressed air in the container is supplied to the liquid outlet 3a.
The liquid further enters the discharge pipe 3 and rises the liquid inflow side pipe 2. At this time, the liquid 10 in the pipe 2 and the discharge pipe 3 flows down into the container 4, so that the liquid supply power by the extraction pump 9 is lost. Therefore, even if the cap 9a of the extraction pump 9 is not opened at the time of releasing the sealing of the stopper 5, it does not flow again from the supply side. Next, an experimental result for obtaining an appropriate sectional ratio between the exhaust pipe and the discharge pipe will be described. The experiment used the apparatus shown in FIG. 1 and FIG.
m, inner space cross section Sd0 = 42.25πmm ² , discharge pipe 3 has inner diameter d1 = 14 mm, inner space cross section Sd1 = 49πmm.
The optimum diameter of the exhaust pipe 7 when it is fixed at ² is obtained. The exhaust pipe 7 has an outer diameter D2 of 3 mm to 10 mm and an inner diameter d2
Is sequentially changed from 2 mm to 9 mm, the pressure change in the container at the time of liquid supply at each pipe diameter, and the time t1 required for liquid supply.
And the time t2 required for the liquid to fall from the liquid inlet tube 2 after the liquid supply was completed. FIG. 3 shows a pressure change diagram in the container at the time of liquid supply.
This measurement was carried out using a simple gauge for enclosing liquid and air. When the inner diameter of the exhaust pipe 7 is d2 ≧ 7 mm, there is no pressure increase at the time of liquid supply, and after the lower end of the exhaust pipe 7 is immersed in the liquid 10, the internal pressure rises sharply, and thereafter, at a constant value. There is a certain pressure when the liquid supply is stopped. When d2 = 5 mm, a slight pressure increase (approximately 1/7 of the pressure at the time of stopping the liquid supply) is observed at the beginning of the liquid supply, but is immediately resolved. When d2 = 4 mm, the pressure increases slightly, but it is still 1/4 of the pressure when the liquid supply is stopped.
It is about 1/7. However, when d2 = 3 mm, the pressure increases to about ３ to １ ／ of the pressure at the time of liquid supply stop, and when d2 = 2 mm, the pressure at the time of liquid supply falls below ３ of the pressure at the time of liquid supply stop. Disappears. This indicates that the exhaust is not performed smoothly. Next, Table 1 shows the relationship between the liquid supply time t1 and the liquid drop time t2 accompanying the change in the diameter of the exhaust pipe 7. [Table 1] The discharge pipe effective area Sd1 'shown in Table 1 is a value obtained by subtracting the occupied cross-sectional area SD2 of the exhaust pipe from the inner cross-sectional area Sd1 of the discharge pipe. It shows the difference between the inner cross-sectional area Sd0 of the pipe and the effective area Sd1 'of the discharge pipe. This ΔS is d2 = 4, 5, 3, 2,
It increases in the order of 7.9 mm. On the other hand, the pressure rise in the container at the time of liquid supply is greatly increased at d2 ≦ 3 mm as described above. The liquid supply time is d2 = 4, 5, 7, 3, 2, 9
The pipe diameters are d2 = 4 mm and 5 mm, and the liquid supply is completed in substantially the same time as when only the extraction pump 9 is used. Therefore, it can be understood that the effective area Sd1 'of the discharge pipe can be sufficiently secured, and the pipe diameter for smoothly performing the exhaust shortens the liquid supply time. Also, when d2 = 3 to 7 mm, the liquid dropped 7 to 9 seconds after the liquid supply, but 2 mm and 9 m
At the time of m, neither fell. Thus, it has been found that the above-mentioned tube diameters d2 = 4 mm and 5 mm are also suitable for the liquid falling time. As described above, in the liquid supply automatic stop device according to the present invention, the exhaust adjustment section is a thin tube extending to a height exceeding the supply-side liquid level. There is no risk of causing the liquid supply, and even when dust or the like is mixed in the liquid, the liquid supply can be reliably stopped at the set liquid level. In addition, the inner space of the exhaust pipe is ensured to suppress the pressure increase in the container during liquid supply, and the effective discharge cross section of the discharge pipe is sufficiently ensured. The liquid can be supplied smoothly. Also, by determining the cross-sectional ratio of the exhaust pipe and the discharge pipe in this way, the compressed air in the container enters the discharge pipe from the liquid discharge port and allows the liquid inside to flow down. No reflow when the plug is opened does not occur even if this is not particularly performed.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a longitudinal sectional view of a liquid supply automatic stop device. FIG. 2 is an explanatory diagram of a method of using a liquid supply automatic stop device. FIG. 3 is a diagram showing a pressure change in a container at the time of liquid supply. FIG. 4 is a longitudinal sectional view of a conventional liquid supply automatic stop device. [Description of Signs] 1 Automatic liquid supply stop device 2 Liquid inlet side tube 3 Discharge tube 3a Liquid outlet 4 Liquid receiving container 4a Opening hole 5 Plug body 6 Small tube 7 Exhaust tube 10 Liquid 10a Set liquid level height 10b Supply side Liquid surface

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁷ , DB name) B67D 5/42 B67D 5/372 F04B 43/08

Claims (1)

(57) [Claim 1] A discharge pipe which is inserted into a stopper for sealing the opening of a liquid receiving container to open a liquid discharge port at a lower end and is connected to a liquid inflow side pipe. A liquid supply automatic stop device having a discharge pipe inserted through the inside of the discharge pipe, protruding a lower end to a depth lower than a set liquid level in the container, and connecting an upper end to a discharge adjustment unit. has an empty cross sectional area inner to suppress container pressure increase in the liquid supply way, the liquid discharge
The mouth is opened at a position higher than the set liquid level and
The mouth area is larger than the inner cross-sectional area of the liquid inlet side tube.
The exhaust adjusting section is a thin tube having an inner cross-sectional area substantially equal to that of the exhaust pipe and extending at least to a height exceeding the supply-side liquid surface, and occupying the exhaust pipe from the inner cross-sectional area of the discharge pipe. An automatic liquid supply stop device, wherein an effective discharge cross-sectional area obtained by subtracting a cross-sectional area substantially corresponds to an inner cross-sectional area of a liquid inflow-side tube.