JPS627079B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a fluid supply device used, for example, in an oil depot for refueling lorries.

[Prior art] When replenishing gasoline to a conventional tank truck,
The main valve, which was installed in a pipe through which a large amount of gasoline flowed, required a great deal of force to operate. In order to solve this problem, the present applicant invented a liquid supply device that is equipped with a main valve on-off valve, which is opened and closed by a light lever operation, and published in Japanese Patent Publication No. 57-29360. As announced, the liquid supply device connects the main valve to the outflow side through a side passage provided with a main valve opening/closing valve and a negative pressure generator, and connects a hydraulic chamber provided at the back of the main valve to the main valve opening/closing valve. The back pressure of the main valve changes and the main valve opens and closes by opening and closing the valve with a manual lever or by closing the main valve due to the negative pressure generated in the negative pressure generating part, and the back pressure of the main valve changes and the main valve opens and closes, which is constant in the negative pressure generating part. In order to generate this negative pressure, it is necessary to flow more than a certain amount of liquid into the side passage, and it has been discovered that water hammer may occur due to the closing of the main valve opening/closing valve. In this case, it is necessary to reduce the flow rate flowing through the side passage, which makes it difficult to generate negative pressure in the negative pressure generating section, and the main valve opening/closing valve will not close.

For example, Japanese Utility Model Publication No. 42-17383 discloses a liquid supply device in which a solenoid valve is provided in a side passage and the solenoid valve is controlled by the liquid level in the liquid tank. However, this type of valve requires wiring for external power supply to drive the valve, and is dangerous when using flammable liquids such as gasoline.

[Object of the Invention] Therefore, the object of the present invention is to open and close the main valve without using external energy such as electricity or air, which is inexpensive and without danger, and which opens and closes the main valve by the action of negative pressure. To provide a liquid supply device which allows a main valve to be closed slowly and does not cause water hammer when closing.

[Configuration of the Invention] According to the present invention, a main valve is provided in the middle of the liquid supply pipe,
A hydraulic pressure chamber connected to the inflow side of the main valve by an inlet is provided at the back of the main valve, and the hydraulic pressure chamber is connected to the outflow side of the main valve via a first side passage provided with a main valve opening/closing valve. The inflow side of the main valve is connected to the outflow side of the main valve through a second side passage provided with a side passage valve and a negative pressure generating section, and a manual opening/closing lever is provided on the side passage valve to generate negative pressure. A side where the main valve opening/closing valve provided in the first side passage is connected to a negative pressure pipe and an automatic closing device that operates to close the side passage valve when the negative pressure pipe is closed, and the main valve opening/closing valve provided on the first side passage is provided on the second side passage. It is designed to be interlocked with the road valve by an interlocking means.

[Operations and Effects of the Invention] Therefore, when the side passage valve is opened with the manual lever, the main valve opening/closing valve opens in conjunction with the side passage valve, liquid flows through the second side passage, and negative pressure is generated in the negative pressure generating section. occurs, but the liquid level in the supplied liquid tank is still low, so the negative pressure pipe is in communication with the atmosphere, and the negative pressure is not transmitted to the automatic closing device. By opening the main valve opening/closing valve in communication with the side passage valve, the liquid in the hydraulic pressure chamber communicating with the first side passage flows out, and as a result, the pressure in the hydraulic pressure chamber becomes low, and the main valve opens in the hydraulic pressure chamber. The liquid supply pipe opens and the liquid flows into the tank.

When the liquid level in the tank reaches a certain level and the negative pressure pipe is blocked with liquid, the negative pressure generated in the negative pressure generating section is transmitted to the automatic closing device, and the side valve and main valve are closed by the action of this device. Since the on-off valve closes, the pressure in the hydraulic chamber increases, and as a result, the main valve closes. At this time, the change in pressure in the hydraulic pressure chamber is determined by the difference between the amount of liquid flowing into the hydraulic pressure chamber and the amount of liquid flowing out, so by setting that difference constant, the main valve can be closed slowly. , and water hammer does not occur.

As described above, according to the present invention, the main valve can be closed relatively slowly by controlling the flow of liquid in the first side passage when opening and closing the main valve. It is extremely suitable for seed liquid supply devices. In addition, since a main valve opening/closing valve that interlocks the side passage valve is provided to open and close the first side passage, the fluid flowing out from the back pressure chamber of the main valve can be communicated and cut off at the same time as the side passage valve is opened and closed. The opening and closing speed of the valve is
It can be controlled only by the amount of liquid flowing into the back pressure chamber from the inlet of the back pressure chamber. Therefore, the amount of liquid required to generate negative pressure and the amount of liquid required to open and close the main valve can be determined separately.

Since the first and second side passages are provided and the main valve opening/closing valve is provided in conjunction with the side passage valve, the opening/closing speed of the main valve and the generation of negative pressure are controlled by separate liquid flows. Therefore, suitable liquid supply work can be performed in a liquid supply device that controls liquid supply by generating negative pressure.

Note that any known technology can be used as the automatic closing device operated by negative pressure.

[Embodiment] An embodiment of the present invention will be described below with reference to the drawings.

In FIGS. 1 and 2, a liquid supply pipe 1 has one end that can be inserted into a tank 2, and the other end connected to the liquid supply side as shown in FIG. A main valve 3 is provided in the middle of the valve 1. The main valve 3 is biased in the closing direction by a spring 4, and a sleeve 5 in the center is guided by a main valve guide rod 6, so that the main valve 3 moves smoothly. A hydraulic chamber 7 is formed at the back of the main valve 3, and this hydraulic chamber 7 is sealed by a seal 8 provided on the main valve 3, and an inflow port whose inflow rate is adjusted by an inflow rate adjustment screw 9. 10 are provided.

A side passage inlet pipe 11 is connected to the liquid supply pipe 1 on the upstream side of the main valve 3, and a side passage outlet pipe 12 is connected to the liquid supply pipe 1 on the downstream side of the main valve 3. A self-closing device 13 is provided between the bypass inlet pipe 11 and the bypass outlet pipe 12, and has a bypass valve 15 biased by a spring 14. The liquid passage from this side passage inlet pipe 11 to the side passage outlet pipe 12 constitutes a second side passage.

A lever 16 for opening and closing the bypass valve 15 is fixed to a shaft 18 that is pivotally supported by a case 17.
A bell crank 19 is fixed to and rotated by a lever 16. The bell crank 19 has a contact piece 2 that restricts the rotation of the lever 16.
0, 21, and one end of the bell crank 19 is provided with a recess 24 that can engage with a click consisting of a spring 22 and a ball 23;
The swing lever 25 is in contact with it. Swing lever 25
An operating rod 27 of a cam lever 26 that opens and closes the bypass valve 15 comes into contact with the central portion of the lever 25 , and an end of the swinging lever 25 is pivotally connected to a sliding rod 28 . The sliding rod 28 is locked by a locking rod 30 and a ball 31 fixed to the diaphragm 29.
With the above configuration, when the lever 16 is rotated clockwise, the bell crank 19, the swing lever 25, and the cam lever 26 are sequentially rotated to shift from the state shown in FIG. 1 to the state shown in FIG. 2, and the bypass valve 15 opens. .

A check valve 34 biased by a spring 33 is provided downstream of the bypass valve 15, and a negative pressure generating section 35 is provided near the check valve 34. One side of this negative pressure generating section 35 is connected to a negative pressure pipe. Spring 37 through 36
The other side is connected to a negative pressure pipe 39 that opens to the tank 2. A float valve is provided at the open end of the negative pressure pipe 39. When the liquid level in the tank 2 rises above a certain value, a float valve is floated by the liquid and closes the negative pressure pipe 39. Kosho 57-
This is disclosed in Japanese Patent No. 29360, and illustration thereof is omitted since it is not the gist of the present application. Further, a function test valve 40 and an alarm device 41 may be provided in the middle of the negative pressure pipe 39, and the valve 40 may be closed by a signal from the flow meter 55. As shown in FIG. 4, in the device 41, a diaphragm 42 moves against a spring 43 due to negative pressure in a negative pressure tube 39, and an operating rod 44 is moved.
The switch 45 is closed via the switch 45 to ring a bell.

Further, the hydraulic pressure chamber 7 at the back of the main valve 3 is connected to the side passage outlet pipe 1.
2 through pipes 46 and 47, and these pipes 4
A main valve opening/closing valve 49 which is biased by a spring 48 and interlocks with the side passage valve 15 is provided between the valves 6 and 47 . From this hydraulic pressure chamber 7 to a pipe 46, a main valve opening/closing valve 49,
The liquid path through the tube 47 to the outlet side line 12 constitutes a first side line. This main valve opening/closing valve 49
The stem 60 extends to engage with the side valve 15, and thus the spring 48 and the stem 60 constitute interlocking means for interlocking the main valve on/off valve with the side valve. Note that 50 is a support shaft 51 of the swing lever 25.
52 is a vapor recovery tube, 53 is a ground wire of a coil spring that allows the adjustment tube 54 at the outlet of the liquid supply tube 1 to move without any trouble without getting caught, and 55 is a flow rate. (Figure 3), 56 is an on-off valve, 57 is a hand valve,
58 is a pressure equalizing pipe (Fig. 1). When a vapor recovery is provided in the vapor recovery pipe 52,
The internal pressure of the tank 2 increases with refueling, but since the increased pressure is applied to the diaphragm chamber 60 via the pressure equalizing pipe 58 and the passage 59, the negative effect generated by the check valve 34 is eliminated regardless of the internal pressure of the tank 2. The pressure causes the diaphragm 29 to operate properly. Therefore, changes in the internal pressure of the tank 2 do not affect the operation of the diaphragm 29.

In the above embodiment, the side pipes 11 and 12 may be lengthened to separate the automatic closing device 13 such as the side valve 15 from the main valve 3, and the main valve 3 may be located near the support part S. . When operating, first lever 16
Rotate clockwise from the position shown in Figure 1 to the position shown in Figure 2,
It is held in that position by clicks 22 and 23.
Then, the side passage valve 15 opens via the bell crank 19, the swing lever 25, and the cam lever 26, and the liquid from the side passage inlet pipe 11 pushes the check valve 34 wide and flows inside the side passage outlet pipe 12. Therefore, negative pressure is attempted to be generated in the negative pressure generating section 35, but the negative pressure tube 39
Since the pressure inside the tank 2 is communicated with the atmospheric pressure, no negative pressure is generated in the negative pressure section yet. The main valve opening/closing valve 49 opens in response to the side passage valve 15, and fluid flows into the side passage outlet pipe 12, so that the pipe 47 becomes negative pressure, and the negative pressure is transferred to the hydraulic chamber 7 via the pipe 46.
It is transmitted to That is, since the pipe 46 is larger than the inlet 10, the pressure in the hydraulic chamber 7 becomes negative, and the main valve 3 is smoothly guided by the guide tube 6 and moves toward the hydraulic pressure chamber 7 as shown in FIG. Therefore, the liquid supply pipe 1 is opened and the liquid is supplied into the tank 2. When the liquid in the tank reaches a certain height, the mouth of the negative pressure tube 39 is closed, and negative pressure is generated in the negative pressure generating section 35, and this negative pressure causes the diaphragm 29 to bend against the spring 37. death,
At the same time, the locking rod 30 moves and the sliding rod 28 that was locked together with the ball 31 and its support shaft 51 are moved to the first position.
It moves to the left in the figure and assumes the position shown in FIG. At this time, the side passage valve 15 and the main valve opening/closing valve 49 are closed by the force of the spring 14 and the spring 48, respectively. As a result, no negative pressure acts on the hydraulic pressure chamber 7 at the back of the main valve 3, and the main valve 3 is closed by the spring 4. At this time, liquid is gradually supplied to the hydraulic chamber 7 from the side channel inlet pipe 11 via the inlet 10, so that
The main valve 3 closes at a low speed, so the liquid supply pipe 1 is not closed suddenly, and phenomena such as water hammer do not occur. Normally, the amount of liquid to be replenished into the tank 2 is preset using the preset flowmeter 55 shown in FIG. A signal is sent to the valve 56 and the valve 56 is closed, a predetermined amount of liquid is replenished into the tank, and the hand holder 57 is closed to end the liquid supply. However, if you make a mistake in the preset amount, if the flow meter 55 and the on-off valve 56 malfunction, or if there is residual liquid in the tank 2 and it fills up earlier than planned, the tank 2 may exceed the planned amount. In such a case, the liquid supply device of the present invention operates to ensure that a predetermined amount of liquid is supplied to the tank.

[Effects of the Invention] As explained above, the present invention uses the energy of the supplied liquid to open and close the main valve without using external energy such as electricity or air, so wiring and piping are not required and the cost is low. , there is no danger when used with flammable liquids.

Since separate side passages were provided, the first side passage provided with the main valve opening/closing valve and the second side passage provided with the negative pressure generating part and the side passage valve, the first side passage was provided with the main valve opening/closing speed. By appropriately setting the flow rate of the liquid flowing through the side passage, the opening/closing speed of the main valve can be set to a value that does not cause water hammer. Furthermore, since the flow rate in the second side passage is independent of the flow rate in the first side passage, the flow rate in the second side passage can be set to an amount that generates a negative pressure sufficient to operate the automatic closing device. When the pressure pipe is closed by the liquid level, the valve can be immediately and reliably closed.

The main valve on-off valve and the side passage valve are linked by an interlocking means, so when you operate the manual lever and open the side passage valve, the main valve on-off valve automatically opens, and when you close the side passage valve, the main valve on-off valve automatically opens. The valve opening/closing valve is also automatically closed, making opening/closing the main valve easy and reliable.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal cross-sectional view of one embodiment of the liquid supply device of the present invention, showing the main valve in a closed state, FIG. 2 is a longitudinal cross-sectional view of the same, showing the main valve in an open state, and FIG. FIG. 4 is an explanatory diagram of the state of use, FIG. 4 is a diagram of the alarm device section of the liquid supply device, and FIG. 5 is a partial explanatory diagram showing the main valve opening/closing valve closed. 1...Liquid supply pipe, 2...Tank, 3...Main valve, 1
1...Sideway inlet pipe, 12...Sideway outlet pipe, 13...
... Automatic closing device, 15 ... Side channel valve, 16 ... Lever, 7 ... Liquid pressure chamber, 10 ... Inflow port, 35 ... Negative pressure generation section, 36, 39 ... Negative pressure pipe, 48 ... Spring , 49... Main valve opening/closing valve, 60... Stem.

Claims (1)

[Claims] 1. A main valve is provided in the middle of the liquid supply pipe, a hydraulic chamber is connected to the inflow side of the main valve by an inlet at the back of the main valve, and the hydraulic chamber is connected to a first valve equipped with a main valve on/off valve. The main valve is connected to the outflow side of the main valve via a side passage, and the inflow side of the main valve is connected to the inflow side of the main valve via a second side passage provided with a side passage valve and a negative pressure generating section. A main valve provided in the first side passage, wherein the valve is provided with a manual opening/closing lever, and the negative pressure generating part is connected to the negative pressure pipe and an automatic closing device that operates when the negative pressure pipe is closed to close the side passage valve. A liquid supply device characterized in that an on-off valve is interlocked with a side passage valve provided in a second side passage by an interlocking means.