JP4046533B2 - Liquid supply nozzle and liquid supply device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a liquid supply nozzle having an automatic valve closing function for stopping liquid supply when a liquid level rise in a liquid supply port of a liquid supply tank is detected, and a liquid supply apparatus using the liquid supply nozzle.
[0002]
[Prior art]
In a weighing machine installed at a liquid supply station, etc., a liquid supply nozzle is connected to the liquid supply line via a liquid supply hose. When the liquid supply nozzle is removed from the nozzle hook, the nozzle switch is turned on. Then the pump is started and it is ready to supply liquid. The liquid supply operator can open the valve mechanism built in the liquid supply nozzle by opening the nozzle lever of the liquid supply nozzle and supply the oil liquid fed by the pump to the fuel tank. .
[0003]
For example, when supplying liquid to a fuel tank as a liquid supply tank, after inserting the discharge pipe of the liquid supply nozzle into the liquid supply port of the fuel tank, holding the nozzle lever in the valve open position and continuing the liquid supply, When the liquid level of the fuel tank rises and reaches the liquid supply port, the automatic valve closing mechanism operates to stop the liquid supply. This automatic valve closing mechanism is operated only while the air from the air introduction hole provided at the tip of the discharge pipe of the liquid supply nozzle is supplied to the negative pressure generating unit that generates a negative pressure as the oil liquid is discharged. The mechanism is configured to hold the valve open.
[0004]
And when the liquid level in the fuel tank rises and the air introduction hole of the discharge pipe is closed, the air supply to the negative pressure generating part is shut off, so the negative pressure in the negative pressure generating part increases. The opening of the valve mechanism is released and the main valve is closed.
[0005]
[Problems to be solved by the invention]
By the way, in the liquid supply nozzle equipped with the automatic valve closing mechanism as described above, the air introduction hole provided at the tip of the discharge pipe is blocked by bubbles generated on the liquid level as the liquid level rises in the fuel tank. If this happens, the automatic valve closing operation may occur even though the actual liquid level is considerably below the liquid supply port. The amount of bubbles generated varies depending on the type of oil and the shape of the liquid supply port, and generally the amount of bubbles generated when gas oil is supplied is higher than that of gasoline.
[0006]
  However, with the conventional liquid supply nozzle, if the valve closing operation is performed by the liquid level detection of the automatic valve closing mechanism during liquid supply,WhoIt was necessary to manually open the nozzle lever of the liquid supply nozzle to open the valve mechanism of the liquid supply nozzle in a half-open state and perform additional liquid supply at a small flow rate.
[0007]
Then, this invention aims at providing the liquid supply nozzle and liquid supply apparatus which solved the said subject.
[0008]
[Means for Solving the Problems]
In order to solve the above problems, the following features are provided.
According to the first aspect of the present invention, there is provided a discharge pipe inserted into the liquid supply port of the liquid supply tank, an air introduction port provided at the front end side of the discharge pipe, and a liquid supply flow path communicating with the discharge pipe. A valve seat on which a main valve body that is provided in the middle and opens and closes in response to an operation lever is seated, a negative pressure generator that generates a negative pressure according to the flow rate of liquid discharged from the discharge pipe, and a negative pressure generator An air suction conduit that sucks air from the air inlet by the generated negative pressure, a displacement member that is displaced according to the pressure of the negative pressure generating portion, and a main valve that is locked to the displacement member and that is operated by opening the operation lever. The valve stem of the main valve body is actuated by the operation of a displacement member that locks the valve stem of the body at the valve open position, and the air introduction port is blocked by the liquid surface and the air introduction from the air suction pipe is blocked. A locking member that releases the locking of the valve and the inside of the main valve body is formed so as to penetrate in the axial direction The sub-flow channel, the sub-valve element that opens and closes the sub-flow channel, the urging member that urges the sub-valve member in the valve closing direction, and the slidably provided on the outer periphery of the valve shaft. A sub-valve drive unit that opens the sub-valve in response to a change in the hydraulic pressure, and after the air inlet is blocked by the liquid level of the liquid supply port and the main valve closes the valve seat, When the hydraulic pressure in the liquid supply flow path is lowered, the auxiliary valve driving unit is operated and the auxiliary valve driving unit and the auxiliary valve body are locked by the locking member so that relative displacement is impossible. When the pressure rises, the sub-valve drive unit is operated by this hydraulic pressure to open the sub-valve, thereby connecting the liquid supply flow path and the discharge pipe via the sub-flow path to discharge the oil liquid. The sub-valve opens according to the change in the liquid pressure in the nozzle after the liquid supply nozzle is automatically closed by detecting the liquid level. That. Therefore, it is possible to perform full tank refueling safely without an operator's effort.
[0009]
According to a second aspect of the present invention, the liquid supply nozzle according to the first aspect, a liquid supply path communicated with the liquid supply nozzle, a pump provided in the liquid supply path, and a liquid supply path are provided. A solenoid valve, a detection means for detecting whether or not liquid is being discharged from the liquid supply nozzle, and when the detection means detects that liquid is no longer being discharged, the solenoid valve is closed and a predetermined time has elapsed. And a control means for opening the solenoid valve later, and after the automatic closing operation of the liquid supply nozzle by the liquid level detection, the sub-valve opens automatically according to the change in the liquid pressure in the nozzle. It becomes possible to supply additional liquid. Therefore, it is possible to perform full tank refueling safely without an operator's effort.
[0010]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is a schematic configuration diagram of an embodiment of a liquid supply apparatus according to the present invention.
As shown in FIG. 1, the weighing machine 11 is a liquid supply device with an additional liquid supply function that automatically performs additional liquid supply accompanying bubble detection at the end of full tank liquid supply. A liquid supply hose 14 connected to the liquid supply nozzle 13 is pulled out on the side surface of the housing 12 of the weighing machine 11. The liquid supply nozzle 13 is normally hooked on a nozzle hook 15 provided on the side surface of the housing 12. For example, when the customer's vehicle 16 arrives at the liquid supply station, the liquid supply nozzle 13 is removed from the nozzle hook 15. Then, it is inserted into the liquid supply port 16b of the fuel tank 16a of the vehicle 16.
[0011]
  When the liquid supply nozzle 13 is removed from the nozzle hook 15, the nozzle switch 15 a provided on the nozzle hook 15 isoffFromonWhen the liquid supply nozzle 13 is returned to the nozzle hook 15,onFromoffSwitch to.
[0012]
The liquid supply hose 14 is connected to a liquid supply pipe line (liquid supply path) 17 that forms a liquid supply system path in the housing 12 via a joint 21. The leading end 17 a of the liquid supply pipe 17 extends to the underground tank 18 as an oil liquid storage tank, and a flow meter 19 and a liquid feed pump 20 are disposed in the middle of the liquid supply pipe 17. Has been. Further, an electromagnetic valve 23 for controlling the supply of the oil supplied to the liquid supply nozzle 13 is disposed in the liquid supply pipe line 17. The solenoid valve 23 has a built-in solenoid that drives the valve body to open and close. When the solenoid is excited, the solenoid valve 23 opens to supply oil to the liquid supply nozzle 13.
[0013]
In addition, the underground tank 18 is provided for every oil type, for example, regular gasoline is stored and the underground tank of other oil types is also provided separately although not shown. Further, the weighing machine 11 is provided with a plurality of liquid supply nozzles for each oil type, but in FIG. 1, only one liquid supply nozzle 13 is shown for convenience of explanation.
[0014]
When the discharge pipe 36 of the liquid supply nozzle 13 removed from the nozzle hook 15 is inserted into the liquid supply port 16b, the nozzle switch 15a is turned on and the liquid supply pump 20 is activated to supply liquid. It becomes a state.
[0015]
The control device (control means) 25 is supplied with each signal output from the nozzle switch 15 a and the pulse transmitter 19 a of the flow meter 19, and performs predetermined calculation processing to perform the pump motor 20 a of the feed pump 20, the electromagnetic The valve 21 is controlled, and the current liquid supply amount measured on the flow rate indicator 27 is displayed. The memory (not shown) of the control device 25 stores a control program for performing an additional liquid supply process that automatically performs additional liquid supply accompanying bubble detection when the full tank liquid supply ends.
[0016]
Here, the configuration of the liquid supply nozzle 13 will be described.
FIG. 2 is a longitudinal sectional view of an embodiment of the liquid supply nozzle according to the present invention. FIG. 3 is a cross-sectional view of the liquid supply nozzle.
[0017]
As shown in FIGS. 2 and 3, the liquid supply nozzle 13 is provided with a grip 32 that is gripped during a liquid supply operation at the rear part of the nozzle body 33. The nozzle body 33 has an inflow port 33a to which the hose joint 34 is coupled on the left side surface, and an oil passage 33b communicated with the inflow port 33a inside.
[0018]
The hose joint 34 includes an elbow 34a that is rotatably fitted to the nozzle body 33, a joint 34b that is rotatably fitted to the other end of the elbow 34a, and a hose joint 34c that is connected to the joint 34b. Become. And the liquid supply hose 14 pulled out from the measuring machine (not shown) is connected to the hose coupling 34c.
[0019]
A valve seat member 35 having a valve seat 35 a on which the main valve element 41 is seated is attached to the end of the nozzle body 33 on the front end side. A pipe connection member 37 to which the discharge pipe 36 is connected is inserted into the valve seat member 35.
[0020]
An oil passage 39 is formed in the valve seat member 35 and the pipe connection member 37. In the oil passages 33 b and 39, a liquid supply valve mechanism 43 including a negative pressure generator 40 and a main valve body 41 is accommodated.
[0021]
Further, the liquid supply nozzle 13 is provided with a nozzle lever 46 so as to be rotatable in front of the grip 32. The grip 32 includes a grip 32a, a first lever guard 32b surrounding the nozzle lever 46 on the front side, and a second lever guard mounted between the end of the grip 32 and the first lever guard 32b. 32c.
[0022]
The nozzle lever 46 is formed in the same shape as that of a pistol trigger, and has a curved portion 46b whose upper end is rotatably supported by a shaft 46a and whose lower end is curved in an arc shape. The lever guard 32b is provided with a nozzle lever holding mechanism 52.
[0023]
The negative pressure generating portion 40 described above is configured to generate a negative pressure corresponding to the discharge amount of the oil liquid provided in the valve seat member 35, and includes a passage 44 that opens to the inner wall of the tapered portion of the oil passage 39; The passage 44 is opened away from the inner wall when supplying liquid, and the valve body 47 is in contact with the inner wall by the pressing force of the coil spring 45 when the supply is stopped to close the opening portion of the passage 44 and the oil passage 39.
[0024]
The valve body 47 has a tapered contact portion that contacts the inner wall and closes the oil flow path 39, and is slidably inserted into a central hole formed in the pipe connection member 37. An air suction pipe 53 is inserted into the internal passage 36 a of the discharge pipe 36. One end of the air suction pipe 53 is connected to communicate with an air introduction hole 54 provided at the tip of the discharge pipe 36, and the other end of the air suction pipe 43 is a downstream passage formed in the pipe connection member 37. 49.
[0025]
The air introduction hole 54 functions as a liquid level detection unit at the time of full liquid supply, and communicates with the passage 44 through the air suction pipe 53, the passage 49, and the annular passage 55. The passage 44 communicates with the oil flow path 39 downstream of the valve seat 35a so as to suck air by the negative pressure generated by the negative pressure generating unit 40.
[0026]
Then, the valve seat 35a is opened and oil is discharged to the discharge pipe 36, and a negative pressure is generated in the negative pressure generating part 40 due to the venturi effect, whereby the air sucked from the air introduction hole 54 is As shown in FIG. 3, the gas is introduced into the diaphragm chamber 58 through the suction pipe 53, the passage 49, the annular passage 55, and the passage 56.
To the passage 44 communicated with the central hole 39 and supplied to the annular passage 55 formed on the outer periphery of the valve seat member 35 and the pipe connection member 37. The annular passage 55 communicates with the other end of the passage 44 communicated with the oil passage 39.
[0027]
Next, the automatic valve closing mechanism 71 including the negative pressure generating unit 40 and the liquid supply valve mechanism 43 will be described.
When the nozzle lever 46 of the liquid supply nozzle 13 is operated in the C direction and the liquid supply valve mechanism 43 is opened, the valve body 47 is pressed in the A direction by the fluid pressure to open the valve and liquid supply is started. Thereby, the oil liquid passes through the oil flow path 39 and is discharged to the discharge pipe 36. At that time, the negative pressure generating unit 40 generates a venturi effect, that is, a negative pressure corresponding to the flow rate of the oil liquid, and the air in the passage 44 that opens to the inner wall of the oil passage 39 is sucked into the oil passage 39. Is done. While the air introduction hole 54 is not blocked by the liquid surface, the negative pressure generated in the diaphragm chamber 58 is small. However, when the air introduction hole 54 is blocked by the oil liquid, the inside of the diaphragm chamber 58 is small. The negative pressure increases. Therefore, the diaphragm 74 is pulled up by this negative pressure. As a result, the main valve element 41 of the valve mechanism 43 is closed, and the discharge of the oil from the liquid supply nozzle 13 is stopped.
[0028]
Further, the valve shaft unit 60 that supports the main valve body 41 of the liquid supply valve mechanism 43 is slidably fitted with a front shaft 61, a rear shaft 62, and a sleeve 70 (sub valve drive unit). It has a triple structure and is housed in the nozzle body 33. A rear shaft 62 is slidably inserted into a hollow portion of the front shaft 61 formed in a cylindrical shape. Further, the front shaft 61 and the rear shaft 62 are pivotally supported by bearings 63a and 63b provided in the nozzle body 23 so as to be slidable in the A and B directions, and by the spring force of the coil springs 64, 65 and 72. The main valve body 41 is pressed against the valve seat member 35.
[0029]
The front shaft 61 has a guide rod 61a inserted into a guide hole 41b formed inside a sub-flow channel 41a that penetrates the main valve body 41 at one end, and a disk-like shape that protrudes radially from the outer periphery of the guide rod 61a. A secondary valve body 61b. A coil spring 64 is in contact with the back surface of the sub-valve body 61 b, and the sub-valve body 61 b is seated on a sub-valve seat 41 c formed on the back side of the main valve body 41 by the spring force of the coil spring 64.
[0030]
Further, as shown in FIG. 3, the front shaft 61 includes a shaft hole 61d into which the rear shaft 62 is slidably inserted in the axial direction (A and B directions), a shaft hole 61d, and an oil passage. 39, a communication hole 61e communicating with 39, a small hole 61f penetrating to the outer peripheral side orthogonal to the shaft hole 61d, and a valve portion 68 formed inside the shaft hole 61d.
[0031]
The valve portion 68 functions as a pressure relief valve for releasing the pressure when the valve is closed, and includes a seal member 69 mounted inside the shaft hole 61d and a rear shaft 62 that contacts the seal member 69. It is comprised from the edge part 62a. The rear shaft 62 is urged in the A direction by the spring force of the coil spring 65 and is pressed against the seal member 69. Therefore, the valve portion 68 is normally closed, and when the main valve body 41 is closed as described later, the valve portion 68 is opened and the pressure of the oil passage 33b formed in the nozzle body 33 is reduced downstream. This is a pressure relief valve that escapes to the oil passage 39 on the side.
[0032]
Further, a sleeve 70 is fitted on the outer periphery of the front shaft 61 so as to be slidable in the axial direction. The sleeve 70 includes a large-diameter portion 70a that contacts a step portion 61g formed on the outer periphery of the front shaft 61, and a small-diameter cylindrical portion 70b that extends in the B direction from the large-diameter portion 70a.
[0033]
  The large-diameter portion 70 a of the sleeve 70 is pressed in the A direction by the spring force of the coil spring 72, and the pressing force due to the hydraulic pressure of the oil flow path 33 b is the spring of the coil spring 72.PowerMove in direction B when it becomes largerThe
[0034]
On the outer periphery of the front shaft 61, the rear shaft 62, and the sleeve 70, recesses 61h, 62b, and 70c that are locked by a locking mechanism described later are formed. When these recesses 61h, 62b, and 70c are arranged at the same position, the front shaft 61, the rear shaft 62, and the sleeve 70 are integrally locked.
[0035]
The rear shaft 62 is provided with an insertion hole 62c through which the nozzle lever 46 is inserted. The upper end of the nozzle lever 46 protrudes in a semicircular shape with a contact portion 46c inserted through an insertion hole 62c that drives the valve mechanism 43 to open and close. Therefore, when the nozzle lever 46 is turned in the C direction, the front shaft 61, the rear shaft 62, and the sleeve 70 integral with the main valve body 41 are displaced in the valve opening direction (B direction).
[0036]
As a result, the oil supplied to the supply nozzle 13 via the supply hose 14 passes through the oil passages 33b and 39 and is supplied from the discharge pipe 36 to the supply port of the fuel tank.
[0037]
The automatic valve closing mechanism 71 is a mechanism that performs a valve closing operation by detecting the liquid level at the time of full liquid supply, and a diaphragm chamber 58 that communicates with the passage 56 and a diaphragm (displacement member) 74 that is mounted on the diaphragm chamber 58. And a locking member 75 connected to the central portion of the diaphragm 74 and engaged with the recesses 61h, 62b, and 70c, a coil spring 67 for biasing the diaphragm 74, and a lid 69 for closing the diaphragm chamber 58.
[0038]
The diaphragm 74 is fixed by a diaphragm presser 73 whose outer peripheral edge is pressed by a lid 69, and the central portion thereof is displaced in the E and F directions in accordance with the pressure change of the diaphragm chamber 58.
[0039]
The locking member 75 is fastened to the center portion of the diaphragm 74 by the coupling member 84 and is displaced in the E and F directions according to the pressure difference acting on the diaphragm 74. Further, the locking member 75 has a U-shaped cross section when viewed from the front so as to straddle the cylindrical portion 70 b of the sleeve 70.
[0040]
A pair of locking pins (locking members) 76 extending in the vertical direction are slidably mounted in the A and B directions on both ends of the locking member 75 formed in a U-shape. Yes. The locking pin 76 integrally couples the front shaft 61, the rear shaft 62, and the sleeve 70 by fitting into the front shaft 61, the rear shaft 62, and the recesses 61h, 62b, and 70c of the sleeve 70, and the front side. The shaft 61 is locked with respect to the rear shaft 62.
[0041]
The diaphragm chamber 58 communicates with the oil flow path 39 of the negative pressure generating unit 40 via the passages 56, 55, 44 described above, and communicates with the suction pipe 53 via the passages 56, 55, 49. . At the time of liquid supply, the negative pressure generated by the negative pressure generator 40 is introduced into the suction pipe 53 via the passages 56, 55, and 49, and is sucked from the air introduction hole 54 provided at the tip of the discharge pipe 36. Air is supplied to the suction pipe 53 and the passages 49, 55, 44.
[0042]
Therefore, the pressure in the diaphragm chamber 58 is constant during the liquid supply, and does not change until the air introduction hole 54 is blocked by the liquid level rising the liquid supply port and the air supply from the suction pipe 53 is stopped. At this time, the diaphragm 74 provided in the diaphragm chamber 58 is urged in the F direction by the spring force of the coil spring 77, and the locking pin 76 of the locking member 75 is connected to the front shaft 61, the rear shaft 62, and the sleeve 70. Are held at the valve shaft locking position to be engaged with the recesses 61h, 62b, and 70c.
[0043]
Further, the rear shaft 52 in the liquid supply is locked at the valve opening position where the nozzle lever 36 is displaced in the B direction by the valve opening operation, and the front shaft 51 is moved to the rear via the pin 65a of the locking member 75. Locked to the side shaft 52.
[0044]
Here, when the air introduction hole 54 of the discharge pipe 36 is closed by the liquid level or bubbles generated on the liquid level, air suction from the air introduction hole 54 is blocked and the liquid level is detected. That is, air supply from the suction pipe 53 to the negative pressure generating unit 40 is stopped, and air in the diaphragm chamber 58 is sucked into the negative pressure generating unit 40 through the passages 56, 55, and 44.
[0045]
As a result, the air pressure in the diaphragm chamber 58 is reduced, and the central portion of the diaphragm 74 is displaced in the E direction against the spring force of the coil spring 77. Thus, the locking pin 76 of the locking member 75 provided on the diaphragm 74 is separated from the front shaft 61, the rear shaft 62, and the recesses 61h, 62b, and 70c of the sleeve 70, and the front shaft 51 and the sleeve 70 are locked. Is released. The front shaft 61 is closed in the direction A by the spring force of the coil spring 64 to bring the main valve body 41 into contact with the valve seat member 35. Thus, the oil passages 33b and 39 are blocked by the main valve body 41 and the supply of the oil liquid is stopped.
[0046]
Next, the nozzle lever holding mechanism 52 will be described.
The nozzle lever holding mechanism 52 includes a holding lever 80 that is rotatably supported in a groove 32e formed in the lever guard 32b, a triangular contact portion 81 that is formed to protrude from the upper surface side of the holding lever 80, and A torsion spring (not shown) that urges the holding lever 80 in a direction (G direction) away from the nozzle lever 46 is configured.
[0047]
The nozzle lever holding mechanism 52 is configured to assistly hold the nozzle lever 46 at the valve opening position with a relatively weak force when the nozzle lever 46 reaches the valve opening position where the valve mechanism 43 is opened. Yes. That is, the holding lever 80 is supported by a shaft 83 horizontally mounted in the groove 32c so as to be pivotable in the vertical direction, and is provided so as to be displaceable in a movement trajectory through which the tip 46d of the nozzle lever 46 passes. Yes.
[0048]
The holding lever 80 at the time of non-liquid supply is urged in a direction (G direction) away from the nozzle lever 46 by a spring force of a torsion spring (not shown), so that the nozzle lever 46 opens in the valve opening direction (C direction). ) Is retracted downward from the movement locus of the tip 46d.
[0049]
The holding lever 80 when performing full tank liquid supply or preset liquid supply is rotated in the direction close to the nozzle lever 46 (H direction) and moved within the movement locus of the tip 46d. As a result, the contact portion 81 provided on the upper surface side of the holding lever 80 moves to a position where it can contact the tip end portion 46 d of the nozzle lever 46. Therefore, when the nozzle lever 46 is to be rotated in the valve closing direction (D direction), the tip end portion 46d of the nozzle lever 46 comes into contact with the contact portion 81, and the return operation is supplementarily restricted.
[0050]
Further, a plurality of contact portions 81 (three in this embodiment) are provided at predetermined intervals according to the valve opening of the valve mechanism 43.
[0051]
The contact portion 81 includes an inclined surface 81a inclined in the valve opening operation direction of the tip end portion 46d of the nozzle lever 46 and the tip end of the nozzle lever 36 so as to be pressed downward by the valve opening operation of the tip end portion 46d of the nozzle lever 46. A contact surface 81b that contacts the portion 36d.
[0052]
Here, the operation of the liquid supply nozzle 13 when supplying liquid to the fuel tank of the vehicle will be described with reference to FIGS.
[0053]
  Before the liquid supply operation, the liquid supply nozzle 13 is hooked on the nozzle hook 15, and the nozzle switch 15a isoffIt has become. At this time, as shown in FIG. 4, the valve mechanism 43 of the liquid supply nozzle 13 is held in a closed state with the main valve body 41 abutting against the valve seat 35 a of the valve seat member 35. The sub valve body 61b is also seated on a sub valve seat 41c formed on the back side of the main valve body 41, and the valve portion 68 is in a closed state. Further, the valve body 47 is biased by the coil spring 45 to block the oil passage 39.
[0054]
As shown in FIG. 1, an operator who performs a liquid supply operation (a worker at a liquid supply station or a driver in the case of the self-service method) removes the liquid supply nozzle 13 from the nozzle hook 15 and supplies the liquid supply nozzle 13. The discharge pipe 36 is inserted into the liquid supply port 16 b of the fuel tank 16 a of the vehicle 16. Accordingly, when the nozzle switch 15a is turned on, the liquid supply pump 20 is activated and liquid can be supplied.
[0055]
As shown in FIG. 5, when the operator grips the grip portion 32a of the grip 32 of the liquid supply nozzle 13 and pulls the curved portion 46b of the nozzle lever 46 in the C direction, the valve shaft unit 60 opens in the valve opening direction ( The main valve body 41 of the valve mechanism 43 opens away from the valve seat member 35.
[0056]
  At this time, the locking pin 76 of the locking member 75 provided on the diaphragm 74 is engaged with the front shaft 61, the rear shaft 62, and the recesses 61h, 62b, and 70c of the sleeve 70. The side shaft 62 and the sleeve 70 are joined together.Yes.
[0057]
While the main valve body 41 is separated from the valve seat member 35, the oil liquid fed by the liquid feed pump 20 passes through the oil passages 33b and 39 and passes through the valve body 27 as shown by arrows in FIG. The valve is opened and discharged from the discharge pipe 36 to the fuel tank 16 a of the vehicle 16. Thus, when the valve body 27 is opened, the flow rate of the oil liquid is increased, and a negative pressure is generated in the negative pressure generator 40. Thereby, the air in the air introduction hole 54 of the discharge pipe 36 is sucked into the negative pressure generating unit 40.
[0058]
Further, the tip end portion 46d of the nozzle lever 46 contacts the contact portion 81 of the holding lever 80 of the nozzle lever holding mechanism 42, whereby the valve lever 46 is held at the valve opening position. Thus, the liquid supply nozzle 13 is kept in the liquid supply state.
[0059]
When oil liquid is discharged from the liquid supply nozzle 13 to the fuel tank 16a and the liquid level rises, and eventually the liquid level rises to the liquid supply port 16b, bubbles generated on the liquid level reach the tip of the discharge pipe 36.
[0060]
When the bubbles generated on the liquid surface block the air introduction hole 54 of the discharge pipe 36, the state shown in FIG. 6 is reached when the air suction from the air introduction hole 54 is blocked. That is, air supply from the suction pipe 53 to the negative pressure generating unit 40 is stopped, and air in the diaphragm chamber 58 is sucked into the negative pressure generating unit 40 through the passages 56, 55, and 44.
[0061]
Therefore, the air pressure in the diaphragm chamber 58 is reduced, and the central portion of the diaphragm 74 is displaced in the E direction against the spring force of the coil spring 77. As a result, the locking pin 76 of the locking member 75 provided on the diaphragm 74 is separated from the recesses 61 h and 62 b of the front shaft 61 and the rear shaft 62 to release the locking of the front shaft 61. The locking pin 76 of the locking member 75 is engaged only with the recess 70c of the sleeve 70 located on the outermost periphery.
[0062]
  The front shaft 61 that has been unlocked as described above is a coil spring 64 spring.To forceThe main valve body 41 is brought into contact with the valve seat 35a of the valve seat member 35 by sliding further in the valve closing direction (A direction). Thus, the oil passages 33b and 39 are blocked by the main valve body 41 and the supply of the oil liquid is stopped.
[0063]
  When the supply of the oil liquid is stopped, the flow rate pulse is not transmitted from the flow rate pulse transmitter 19a. Therefore, the control device 25 described later confirms that the supply of the oil liquid has stopped because the flow rate pulse is not input. Detecting and closing the solenoid valve 23The
[0064]
  In addition, since the rear shaft 62 maintains the valve opening state of the nozzle lever 46, the rear shaft 62 is maintained in a state of moving in the valve opening direction (direction B), and the end portion 62 a is connected to the valve portion 98. It is separated from the seal member 69. Therefore, the valve part 68 will be in a valve open state, and the residual pressure of the oil flow path 33b and the liquid supply hose 14 will flow out to the oil flow path 39 through the small hole 61f and the communication hole 61e. Thereby, the pressure of the oil flow path 33b and the liquid supply hose 14 is, DecreasePressed.
[0065]
  Next, the oil pressure between the oil passage 33b and the liquid supply hose 14 flows out downstream of the main valve body 41 through the small hole 61f of the front shaft 61, so that the fluid pressure in the oil passage 33b decreases. Then, the liquid supply nozzle 13 is in the state shown in FIG.The
[0066]
  Therefore, diaphragm chamber 58'sAs the pressure returns to atmospheric pressure, the diaphragm 74 returns to the F direction by the spring force of the coil spring 77. At the same time, the sleeve 70 moves in the direction A by the bias of the coil spring 72.
[0067]
As a result, the locking member 75 fixed to the central portion of the diaphragm 74 moves to a locking position for locking the valve shaft unit 60, and the locking pin 76 of the front shaft 61 and the sleeve 70 except for the rear shaft 62. Engages with the recesses 61h and 70c. Therefore, the rear shaft 62 is not locked by the locking pin 76 and is maintained in a movable state with respect to the front shaft 61.
[0068]
When the electromagnetic valve 23 of the meter 11 is opened after a lapse of a predetermined time (for example, 3 seconds) after the automatic valve closing operation by the bubble detection, the liquid supply nozzle 13 is in a state shown in FIG. That is, when the oil liquid pressurized by the pump 20 is supplied to the liquid supply hose 14 and the oil flow path 33b, the liquid pressure in the oil flow path 33b rises, so that the large diameter portion 70a of the sleeve 70 is pressed against the liquid pressure. And slides in the B direction.
[0069]
At this time, since the locking pin 76 is engaged with the front shaft 61 and the recesses 61 h and 70 c of the sleeve 70, the front shaft 61 slides in the B direction together with the sleeve 70.
[0070]
Accordingly, the sub valve body 61b of the front shaft 61 moves away from the sub valve seat 41c of the main valve body 41 to the valve opening position. As a result, the oil liquid supplied to the oil flow path 33 b passes through the sub flow path 41 a formed inside the main valve body 41 and is discharged to the oil flow path 39.
[0071]
Since the sub valve seat 41c of the sub valve has a smaller diameter than the main valve seat 35a of the main valve, the discharge valve 36 has a discharge amount lower than the discharge amount of the oil when the main valve body 41 is open. Discharged. Thus, a small amount of oil liquid is additionally supplied to the liquid supply port 16b of the fuel tank 16a.
[0072]
Then, when the liquid level in the fuel tank 16 a rises and bubbles generated on the liquid level again block the air introduction hole 54 of the discharge pipe 36, the air pressure in the diaphragm chamber 58 is reduced, and the central portion of the diaphragm 74 is the coil spring 77. Displaces in the E direction against the spring force. As a result, the locking pin 76 of the locking member 75 provided on the diaphragm 74 is separated from the recesses 61 h and 62 b of the front shaft 61 and the rear shaft 62 to release the locking of the front shaft 51. At this time, the locking pin 76 of the locking member 75 is engaged only with the recess 70 c of the sleeve 70.
[0073]
  The front shaft 61 released from the locking by the locking pin 76 is a spring of the coil spring 64.To forceFurther, the liquid supply nozzle 13 is moved as shown in FIG. 9 by sliding in the valve closing direction (direction A) and bringing the sub valve body 61b into contact with the sub valve seat 41c of the main valve body 41 to close the sub flow path 41a. Thus, the first additional liquid supply by the valve opening operation of the auxiliary valve is completed.
[0074]
In the present embodiment, it is set so that the additional oil supply performed after the liquid supply performed by opening the main valve body 41 is stopped is performed a plurality of times.
[0075]
Here, control processing executed by the control device 25 of the weighing machine 11 will be described.
FIG. 10 is a flowchart for explaining a control process executed by the control device 25 of the weighing machine 11.
[0076]
As shown in FIG. 10, the control device 25 of the weighing machine 11 checks whether or not the nozzle switch 15 a is on in step S <b> 11 (hereinafter, “step” is omitted). When the liquid supply nozzle 13 is removed from the nozzle hook 15 and the nozzle switch 15a is turned on, the process proceeds to S12 and the pump 20 is activated. Then, it progresses to S13 and the solenoid valve 23 is opened. As a result, the weighing machine 11 becomes ready for liquid supply.
[0077]
In next S14, it is checked whether or not a flow rate pulse is output from the flow rate pulse 19a of the flow meter 19. In S14, when the flow rate pulse is output from the flow rate pulse 19a, it is determined that the liquid supply nozzle 13 is inserted into the liquid supply port 16b of the vehicle 16 and the nozzle lever 46 is opened to start the liquid supply. (See FIG. 5), the process proceeds to S15, where the flow rate pulses are integrated to calculate the integrated flow rate.
[0078]
Subsequently, in S16, the integrated flow rate is displayed on the flow rate indicator 27. In the next S17, when there is a flow rate pulse from the flow rate pulse 19a, the flow returns to S15 to perform flow rate integration processing and flow rate display. In S17, when there is no flow rate pulse from the flow rate pulse 19a, the air introduction hole 54 of the liquid supply nozzle 13 is closed by the generation of bubbles accompanying the rise of the liquid level of the liquid supply port 16b, and the automatic valve closing mechanism 71 is closed. It is determined that the liquid supply has been stopped by operating (see FIGS. 6 and 7), and the process proceeds to S18. In S18, the electromagnetic valve 23 is closed and the liquid feeding to the liquid supply nozzle 13 is stopped.
[0079]
At this time, in the liquid supply nozzle 13, as shown in FIG. 7, the valve portion 68 is opened, and the pressure of the oil flow path 33b and the liquid supply hose 14 is reduced. In this state, when the predetermined time t set in advance in S19 elapses, the process proceeds to S20, and the electromagnetic valve 23 is opened.
[0080]
Thereby, the oil liquid pressurized by the pump 20 is supplied to the liquid supply nozzle 13. In the liquid supply nozzle 13, as shown in FIG. 8, the sub-valve body 61b of the front shaft 61 is separated from the sub-valve seat 41c of the main valve body 41 and is opened to be supplied to the oil flow path 33b. The oil liquid passes through the sub flow path 41 a formed inside the main valve body 41 and is discharged to the discharge pipe 36. In this way, additional liquid is supplied to the fuel tank 16 a by opening the electromagnetic valve 23.
[0081]
In next S21, it is checked whether or not a flow rate pulse is output from the flow rate pulse 19a of the flow meter 19. In S21, when a flow rate pulse is output from the flow rate pulse 19a, it is determined that additional liquid supply has been performed, and the process proceeds to S22 to add 1 to the value n of the counter. Subsequently, in S23, the counter value n is set to a predetermined number n._a(For example, n_a= 3) is reached.
[0082]
In S23, the counter value n is n times the predetermined number._aWhen it is less, the process returns to S15, and the processes after S15 are repeated. However, in S23, the counter value n is n times the predetermined number._aWhen it has reached, it is determined that the additional liquid supply has ended, and the process proceeds to S24.
[0083]
In S21, when the flow rate pulse is not output from the flow rate pulse 19a, the liquid level of the liquid supply port 16b has already closed the air introduction hole 54 of the liquid supply nozzle 13, and the automatic valve closing mechanism 71 is closed. It judges that it is, and progresses to S24.
[0084]
In S24, it is checked whether the nozzle switch 15a is off. When the liquid supply nozzle 13 is returned to the nozzle hook 15 and the nozzle switch 15a is turned off, the process proceeds to S25, and the electromagnetic valve 23 is closed. Then, it progresses to S26 and the pump 20 is stopped.
[0085]
Thus, after the automatic valve closing mechanism 71 is closed due to the generation of bubbles, the electromagnetic valve 23 can be opened to automatically supply additional liquid, so that the operator can use the nozzle lever 46 of the liquid supply nozzle 13. Therefore, even when an operator is not familiar with the liquid supply operation, it is possible to prevent blowback due to the additional liquid supply.
[0086]
Further, in this embodiment, the auxiliary valve body 61b of the front shaft 61 is separated from the auxiliary valve seat 41c of the main valve body 41 to perform additional liquid supply, so that the oil liquid is opened when the main valve body 41 is opened. By supplying the liquid at a slightly lower flow rate than the flow rate, the oil liquid is prevented from overflowing from the liquid supply port 16a.
[0087]
In the above-described embodiment, the configuration attached to the above-ground weighing machine has been described as an example. However, the present invention is not limited to this, and can be applied to a suspended liquid supply apparatus.
[0088]
【The invention's effect】
As described above, according to the first aspect of the present invention, the discharge pipe inserted into the liquid supply port of the liquid tank to be supplied, the air inlet provided at the tip side of the discharge pipe, and the discharge pipe communicated with each other. And a negative pressure generator that generates a negative pressure in accordance with the flow rate of the liquid discharged from the discharge pipe. An air suction conduit that sucks air from the air inlet by the negative pressure generated in the negative pressure generating portion, a displacement member that is displaced according to the pressure of the negative pressure generating portion, and an operating lever that is locked to the displacement member. Actuation of a displacement member that displaces when the valve shaft of the main valve element is locked at the valve open position by opening the valve, and the air introduction port is blocked by the liquid surface and the air introduction from the air suction line is blocked. The locking member that releases the locking of the valve stem of the main valve element and the inside of the main valve element in the axial direction A sub-flow passage formed so as to penetrate the sub-flow passage, a sub-valve body for opening and closing the sub-flow passage, a biasing member for biasing the sub-valve body in the valve closing direction, and a slidable outer periphery of the valve shaft A sub-valve drive unit that opens the sub-valve in response to a change in the liquid pressure in the liquid supply flow path, and the air inlet is blocked by the liquid level of the liquid supply port and the main valve is After closing the seat, when the hydraulic pressure in the liquid supply flow path decreases, the auxiliary valve drive unit is operated to prevent relative displacement between the auxiliary valve drive unit and the auxiliary valve body. When the hydraulic pressure rises, the auxiliary valve drive unit is operated by this hydraulic pressure to open the auxiliary valve body to open the auxiliary valve body, thereby communicating the liquid supply channel and the discharge pipe via the auxiliary channel, It is characterized by discharging the oil liquid, and after the automatic closing operation of the liquid supply nozzle by the liquid level detection, the sub-valve opens according to the change in the liquid pressure in the nozzle and automatically adds. It is possible to supply fluid. Therefore, the operator can perform full tank liquid supply safely without taking time and effort.
[0089]
According to a second aspect of the present invention, the liquid supply nozzle according to the first aspect, a liquid supply path communicated with the liquid supply nozzle, a pump provided in the liquid supply path, and a liquid supply path are provided. And the detection means for detecting whether or not liquid is being discharged from the liquid supply nozzle, and when the detection means detects that liquid is no longer being discharged, the electromagnetic valve is closed And a control means for opening the solenoid valve after a lapse of time.After the automatic closing operation of the liquid supply nozzle by liquid level detection, the sub-valve opens according to the change in the liquid pressure in the nozzle. It is possible to automatically supply additional liquid. Therefore, the operator can perform full tank liquid supply safely without taking time and effort.
[Brief description of the drawings]
FIG. 1 is a schematic configuration diagram of an embodiment of a liquid supply apparatus according to the present invention.
FIG. 2 is a longitudinal sectional view of an embodiment of a liquid supply nozzle according to the present invention.
FIG. 3 is a cross-sectional view of a liquid supply nozzle.
FIG. 4 is a transverse sectional view showing a valve mechanism of a liquid supply nozzle in which a main valve body is in a closed state.
FIG. 5 is a cross-sectional view showing a valve mechanism of a liquid supply nozzle in which a main valve body is opened.
FIG. 6 is a cross-sectional view showing a valve closing operation by an automatic valve closing mechanism.
FIG. 7 is a cross-sectional view showing a hydraulic pressure relief operation after automatic valve closing.
FIG. 8 is a cross-sectional view showing an operation state in which the auxiliary valve body is opened and additional liquid supply is started.
FIG. 9 is a cross-sectional view showing an operation state in which the auxiliary valve body is closed and the additional liquid supply is completed.
10 is a flowchart for explaining a control process executed by the control device 25 of the weighing machine 11. FIG.
[Explanation of symbols]
11 Weighing machine
13 Liquid supply nozzle
14 Liquid supply hose
15 Nozzle hook
15a Nozzle switch
16a Fuel tank
16b Supply port
17 Supply line
19 Flow meter
20 Liquid supply pump
23 Solenoid valve
25 Control device
27 Flow rate indicator
32 grip
33 Nozzle body
35 Valve seat member
36 Discharge pipe
37 Pipe connection members
39 Oil flow path
40 Negative pressure generator
41 Main disc
41a Subchannel
43 Valve mechanism for liquid supply
46 Nozzle lever
47 Disc
52 Nozzle lever holding mechanism
53 Air suction pipe
54 Air introduction hole
58 Diaphragm room
71 Automatic valve closing mechanism
60 Valve stem unit
61 Front shaft
61b Sub-valve
61h, 62b, 70c recess
62 Rear shaft
64, 65, 72 coil spring
68 Valve
69 lid
70 sleeve
71 Automatic valve closing mechanism
74 Diaphragm
75 Locking member
76 Locking pin
80 Holding lever

Claims (2)

A discharge pipe inserted into the liquid supply port of the liquid tank;
An air inlet provided on the tip side of the discharge pipe;
A valve seat on which a main valve body, which is provided in the middle of the liquid supply flow path communicated with the discharge pipe and opens and closes in response to an operation lever, is seated;
A negative pressure generator that generates a negative pressure according to the flow rate of the liquid discharged from the discharge pipe;
An air suction line for sucking air from the air inlet by the negative pressure generated in the negative pressure generating section;
A displacement member that is displaced in accordance with the pressure of the negative pressure generating portion;
Locked by the displacement member, the valve shaft of the main valve element is locked at the valve open position by opening the operation lever, and the air inlet is blocked by the liquid level so that A locking member that releases the locking of the valve stem of the main valve body by the operation of the displacement member that is displaced by blocking air introduction;
A sub-flow passage formed so as to penetrate the inside of the main valve body in the axial direction;
A sub valve body for opening and closing the sub flow path;
A biasing member that biases the sub-valve element in the valve closing direction;
A sub-valve drive section that is slidably provided on the outer periphery of the valve shaft, and that opens the sub-valve element in response to a change in the hydraulic pressure in the liquid supply flow path,
After the air inlet port is closed by the liquid level of the liquid supply port and the main valve element closes the valve seat, the sub valve drive unit is operated when the liquid pressure in the liquid supply flow path decreases. The sub-valve drive unit and the sub-valve element are locked by the locking member so that relative displacement is impossible, and when the hydraulic pressure rises, the sub-valve drive unit is A liquid supply nozzle, wherein the liquid supply nozzle and the discharge pipe are communicated with each other through the sub-flow path by operating to open the sub-valve body to discharge the oil liquid. The liquid supply nozzle according to claim 1,
A liquid supply path communicating with the liquid supply nozzle;
A pump provided in the liquid supply path;
A solenoid valve provided in the liquid supply path;
Detecting means for detecting whether or not liquid is discharged from the liquid supply nozzle;
Control means for closing the solenoid valve when the detection means detects that liquid is no longer discharged, and opening the solenoid valve after a predetermined time;
A liquid supply apparatus comprising:

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