Liquid supply nozzle

Abstract

To provide an oil feed nozzle with improved workability in fuel replenishment work.SOLUTION: An oil feed nozzle 1 includes an automatic valve closing mechanism 61. A lock mechanism 81 for permitting or prohibiting a displacement of a movable partition wall based on a chamber pressure change of a negative pressure chamber 63 is installed in the automatic valve closing mechanism. The lock mechanism includes: a lock shaft 83 extending along a displacement direction of the movable partition wall; an operation piece attached to the lock shaft and extending in a radial direction of the lock shaft; and a base 82 that guides a rotational displacement of the operation piece whose rotation axis is the lock shaft, and also guides a movement displacement along an axial direction of the lock shaft in response to the rotational displacement of the operation piece. The base is mounted on the nozzle body 3 such that the axial direction of the lock shaft in the lock mechanism is aligned with the displacement direction of the movable partition wall in the automatic valve closing mechanism, and is configured so as to make a shaft end part of the lock shaft approach / separate from the movable partition wall.SELECTED DRAWING: Figure 2

Description

[Technical field]

[0001] The present disclosure relates to a liquid supply nozzle that is provided at the tip of a liquid supply hose of a fuel supply machine that supplies fuel, and that supplies fuel to a fuel tank of, for example, a diesel railcar of a railway vehicle. [Background technology]

[0002] The liquid supply nozzle is equipped with an automatic valve-closing mechanism to prevent fuel from overflowing from the fuel supply port after the fuel tank is full. When the air inlet at the end of the discharge pipe of the liquid supply nozzle inserted into the fuel supply port is blocked by the fuel level or the like, the automatic valve-closing mechanism uses the negative pressure generated by the Venturi effect caused by the fuel flowing inside the nozzle body to close the nozzle valve, which has been opened by the valve-opening operation of the operating lever, regardless of the operating state of the operating lever.

[0003] However, the automatic valve-closing mechanism will also close if the air inlet at the end of the discharge pipe of the fuel supply nozzle is blocked by fuel adhesion or bubbles generated on the fuel surface before the fuel tank reaches a full tank state where the air inlet at the end of the discharge pipe is actually blocked by the fuel surface in the fuel tank. Therefore, for example, during a fuel tank-to-full operation, once the automatic valve-closing mechanism has closed due to bubbles generated on the fuel surface in the fuel tank, the worker must then repeatedly operate the operating lever to close the valve and then open the valve again each time the air inlet is blocked by bubbles and the automatic valve-closing mechanism closes, until the fuel tank is full.

[0004] Therefore, among the liquid supply nozzles equipped with an automatic valve closing mechanism, those equipped with a locking mechanism that can manually lock the automatic valve closing mechanism into an inoperative state have been proposed, as shown in Patent Documents 1, 2 and 3. During a fill-to-fill operation using a liquid supply nozzle equipped with a locking mechanism, if the automatic valve closing mechanism closes due to bubbles before the fuel tank is full, the worker can reduce the burden of operating the liquid supply nozzle thereafter by deactivating the automatic valve closing mechanism with the locking mechanism, and shorten the time required for refueling using a fuel supply machine.

[0005] On the other hand, the fuel tank of a diesel railcar of a railway vehicle equipped with a diesel engine is attached to the underside of the car body mounted on a bogie. The fuel supply port is provided on the underside of the car body at a height position close to the car body side and facing the side of the car body via an introduction pipe extended from the tank body. Therefore, a liquid supply nozzle that supplies fuel to a fuel tank of a diesel railcar of a railway vehicle or the like is formed in advance in a bent shape as described in Patent Document 4 so that the nozzle can easily insert the nozzle tip into the fuel supply port and can easily be hooked onto the fuel supply port during refueling. [Prior art documents] [Patent documents]

[0006] [Patent Document 1] Jpn. Jpn. Published Examination No. 62-42959 [Patent Document 2] Special Publication No. 8-18639 [Patent Document 3] Special Publication No. 58-28197 [Patent Document 4] Japanese Utility Model Application Publication No. 62-95599 Summary of the Invention [Problem to be solved by the invention]

[0007] However, in the case of fuel tanks of diesel railcars and the like, the positions and environments of the fuel refill port and the tank body on the underside of the car body differ depending on the model of the diesel railcar, and therefore, with a conventional liquid supply nozzle equipped with a locking mechanism and having a discharge pipe previously formed in a bent shape, when used to refill a fuel tank of a diesel railcar of a model other than the main model, there were problems such as the liquid supply nozzle being interfered with by the car body, bogie, and adjacent body-mounted equipment, making it difficult to insert the discharge pipe of the liquid supply nozzle into the fuel refill port and making it difficult to operate the operating lever and locking mechanism.

[0008] In addition, the structure and extension state of the introduction pipe that communicates between the fuel refill port and the tank body also differs depending on the type of diesel railcar, depending on the location of the fuel refill port and the tank body on the underside of the vehicle body. Therefore, in certain types of diesel railcars, the automatic valve closing mechanism of the liquid supply nozzle may malfunction due to fuel adhesion or bubbles immediately after the start of refueling, and refueling may have to be started with the locking mechanism deactivated immediately. However, in a conventional fuel supply nozzle that is equipped with a locking mechanism and has a discharge pipe that is previously bent, it is difficult to know whether the locking mechanism is activated or deactivated when the discharge pipe is inserted into the fuel refill port, so there is a problem that the activation state of the locking mechanism must be checked before inserting the discharge pipe into the fuel refill port, or when checking the activation state after the start of refueling, refueling must be temporarily stopped and the liquid supply nozzle attached to the fuel refill port must be removed from the fuel refill port to check the activation state.

[0009] The present disclosure has been made in consideration of the above-mentioned problems, and aims to provide a liquid supply nozzle which, when the discharge pipe is inserted into the fuel fill port of the fuel tank, allows the operation of the operating lever and locking mechanism and confirmation of their operating status without interference from other parts, thereby improving the ease of use in refueling operations. [Means for solving the problem]

[0010] In order to solve the above-mentioned problems, the liquid supply nozzle according to the present disclosure is a liquid supply nozzle equipped with an automatic valve closing mechanism, The automatic valve closing mechanism includes: A lock mechanism is provided to permit or prohibit the displacement of the movable partition wall based on a change in pressure in the negative pressure chamber. The locking mechanism includes: A lock shaft extending along a displacement direction of the movable partition wall; An operation piece attached to the lock shaft and extending in a radial direction of the lock shaft; a base that guides a rotational displacement of the operation piece around the lock shaft as a rotation shaft and guides a moving displacement of the operation piece along an axial direction of the lock shaft in response to the rotational displacement of the operation piece; having The base is attached to the nozzle body so that the axial direction of the lock shaft in the lock mechanism is aligned with the displacement direction of the movable partition wall in the automatic valve-closing mechanism, and is configured to move the axial end of the lock shaft closer to or farther away from the movable partition wall. Effect of the Invention

[0011] According to the liquid supply nozzle of the present disclosure, with the discharge pipe inserted into the fuel fill port of the fuel tank, the locking mechanism can be operated and its operating status can be checked without interference from other parts, thereby improving the workability of the refueling operation.

[0012] Furthermore, problems, configurations, and effects of the present disclosure other than those described above will become apparent from the following description of the embodiments. [Brief description of the drawings]

[0013] [Figure 1] 1 is a cross-sectional view of a fuel supply nozzle according to an embodiment of the present disclosure. FIG. [Diagram 2] 2 is an end view of the fuel supply nozzle shown in FIG. 1 as viewed in the direction of arrow YY. [Diagram 3] 1A is a cross-sectional view of an embodiment of a lock mechanism provided in the automatic valve-closing mechanism of the fuel filling nozzle according to the present embodiment, and FIG. 1B is a cross-sectional view of an embodiment of a guide cover provided in the lock mechanism of the embodiment. [Figure 4] 4A and 4B are external views of the lock mechanism and the guide cover shown in FIG. 3. [Diagram 5] 13 is an external view of the lock mechanism with the guide cover attached. FIG. [Figure 6] FIG. 2 is an external view of the fuel supply nozzle shown in FIG. [Figure 7] 7 is an external view of a lock mechanism as viewed from the direction of arrow cc in FIG. 6. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0014] Hereinafter, an embodiment of the liquid supply nozzle according to the present disclosure will be described with reference to the drawings. The liquid supply nozzle according to the present disclosure is applicable to any liquid supply nozzle equipped with an automatic valve closing mechanism that closes the nozzle valve, which is in an open state due to the valve opening operation of the operation lever, regardless of the operation state of the operation lever, by utilizing the negative pressure generated by the Venturi effect of the fuel flowing inside the nozzle body when the air inlet at the end of the discharge pipe of the liquid supply nozzle inserted into the fuel supply port is blocked by the fuel level. In other words, the embodiment of the liquid supply nozzle according to the present disclosure is applicable to any liquid supply nozzle equipped with an automatic valve closing mechanism that closes the nozzle valve by utilizing the negative pressure generated by the Venturi effect of the fuel flowing inside the nozzle body, without being limited to the specific configuration of the automatic valve closing mechanism or the specific configuration and form of each part of the liquid supply nozzle.

[0015] FIG. 1 is a cross-sectional view of a fuel supply nozzle according to one embodiment of the present disclosure. FIG. 2 is an end view of the fuel filling nozzle shown in FIG. 1 as viewed in the direction of arrow YY.

[0016] The fuel filling nozzle 1 of this embodiment has a nozzle body 3 with a liquid passage 2 passing therethrough. One open end 2i of the liquid passage 2 is the connection side with a fuel filling hose (not shown) extending from a fuel filling machine body having a pump etc., and the other open end 2o is the fixed side of a discharge pipe 4 inserted into a fuel filling port, which is a fuel filling port of a fuel tank to be filled. Oil supplied to the fuel filling nozzle 1 flows through the liquid passage 2 from the one open end 2i to the other open end 2o. A nozzle valve 5 for connecting / blocking the liquid passage 2 is provided midway through the liquid passage 2 of the nozzle body 3.

[0017] The nozzle valve 5 is configured to include an annular valve seat 6 formed on the inner circumferential wall of the liquid passage 2 of the nozzle body 3, and a main valve 7 which seats and separates from the valve seat 6. The nozzle valve 5 is installed in the nozzle body 3 through an attachment opening 8 formed in the nozzle body 3, together with a valve shaft member 19 (described later) and the like. The attachment opening 8 is liquid-tightly covered by a lid 9.

[0018] The main valve 7 is composed of a main valve element 10 which seats on and off the valve seat 6 to open and close the liquid passage 2, and a sub-valve element 11 which seats on and off the main valve element 10 to open and close a valve element passage 13 formed in the main valve element 10.

[0019] As shown in Fig. 2, the main valve element 10 is formed with a stem insertion hole 14 extending in the axial direction at its axis position, and a plurality of valve element passages 13 are formed to surround the stem insertion hole 14. The sub-valve element 11 is disposed upstream of the main valve element 10 with its stem portion 15 passing through the stem insertion hole 14 of the main valve element 10. The sub-valve element 11 has its stem portion 15 guided through the stem insertion hole 14 of the main valve element 10 and seats on and off a ring-shaped valve seat 16 provided on the main valve element 10 to open and close the valve element passage 13. The stem portion 15 of the sub-valve element 11 is formed with a rod insertion hole 17 extending in the axial direction.

[0020] A coil-shaped spring member 18 is interposed between the sub-valve element 11 of the nozzle valve 5 configured in this manner and the above-mentioned cover body 9. The spring member 18 biases the sub-valve element 11 so as to seat the sub-valve element 11 on the valve seat 16 of the main valve element 10, and further seat the main valve element 10 on the valve seat 6.

[0021] A valve stem member 19 is engaged with the main valve 7 of the nozzle valve 5. The valve stem member 19 is composed of a valve stem sleeve 20 and a valve stem rod 22 that can advance and retreat within a sleeve hole 21 of the valve stem sleeve 20.

[0022] 2, the stem sleeve 20 has a stepped shape in the axial direction, with one end thereof serving as an insertion rod portion 23 which can be inserted into the rod insertion hole 17 of the sub-valve element 11, and the other end thereof serving as a sleeve portion 24 which has a larger diameter than the insertion rod portion 23. The boundary step between the insertion rod portion 23 and the sleeve portion 24 serves as a shoulder portion 25 which can come into contact with the main valve element 10. The sleeve portion 24 has a sleeve hole 21 which opens to the other end of the stem sleeve 20 and extends in the axial direction.

[0023] In this embodiment, the insertion rod portion 23 of the stem sleeve 20 is inserted into the rod insertion hole 17 formed in the stem portion 15 of the sub-valve element 11, and its tip side abuts against the bottom of the hole in the rod insertion hole 17. In addition, when the main valve element 10 is seated on the valve seat 6 and the sub-valve element 11 is seated on the valve seat 16 of the main valve element 10, a gap L is provided in the axial direction between the shoulder portion 25 of the stem sleeve 20 and the main valve element 10, the gap L being equivalent to the valve opening stroke of the sub-valve element 11 relative to the main valve element 10. As a result, in the nozzle valve 5, when the valve is opened, the sub-valve element 11 opens first, and then the main valve element 10 opens.

[0024] 2, one end of the stem rod 22 is fitted into the sleeve hole 21 of the stem sleeve 20 so as to be able to advance and retreat therein, with a spring member 26 interposed between the spring member 26 and the bottom surface of the sleeve hole 21. The spring member 26 urges the stem rod 22 toward the opening of the sleeve hole 21 by contracting, so as to separate the stem sleeve 20 and the stem rod 22 from each other.

[0025] The stem sleeve 20 and the stem rod 22 are connected to each other so as to be movable together in the axial direction by an engagement rod 27 of an automatic valve-closing mechanism 61, which will be described later. When the stem sleeve 20 and the stem rod 22 move together, the biasing force generated by the contraction of the spring member 26 is set to be smaller than the biasing force generated by the contraction of the spring member 18.

[0026] The valve shaft member 19 having such a configuration is provided to pass through a valve shaft member insertion hole 28 formed in the nozzle body 3. In this case, the insertion rod portion 23 of the valve shaft sleeve 20 extends movably into the liquid passage 2 via a seal member 29, and the tip side is fitted into the rod insertion hole 17 of the sub-valve body 11. In addition, the other end side of the valve shaft rod 22 of the valve shaft member 19 protrudes from the opening of the sleeve hole 21 to the outside of the nozzle body 3, and is supported in contact with an operating lever 30 that is rotatably supported on the nozzle body 3.

[0027] 1, the base end of the operating lever 30 is rotatably supported by the nozzle body 3, and the rotation of the operating lever 30 allows the free end to approach or move away from the nozzle body gripping portion 32 of the nozzle body 3. The other end of the valve stem rod 22 is abutted against a portion of the operating lever 30 near the support shaft side. In a state in which the valve stem sleeve 20 and the valve stem rod 22 are interlockingly engaged with each other via the engagement rod 27, in response to the rotation of the operating lever 30, the valve stem member 19 formed by the valve stem sleeve 20 and the valve stem rod 22 slides in the valve stem member insertion hole 28, and the nozzle valve 5 opens and closes.

[0028] A lever guard 33 is provided on the nozzle body 3 so as to surround the operating lever 30 along its rotation path. A lever hook 34 is attached to the lever guard 33, which can hold the nozzle valve 5 in an open state by hooking the free end of the operating lever 30. This makes it possible to hold the nozzle valve 5 in a desired valve open position by hooking the free end 30A of the operating lever 30 on any of the steps provided on the lever hook 34, even if the operating lever 30 is released.

[0029] On the other hand, at the other opening end 2o of the nozzle body 3, which is the connection end of the discharge pipe 4, a valve seat member 36 and a coupling member 38, which guides and supports a check valve 37 that seats and releases from the valve seat member 36 and to which the discharge pipe 4 is connected and fixed, are installed in this order, with the valve seat member 36 at the back.

[0030] As shown in the partially enlarged view of the dotted circled portion in FIG. 1, the valve seat member 36 is formed with a tapered valve seat forming hole 39 having a valve seat surface of the check valve 37. The valve seat member 36 has a stepped outer periphery structure in which a large diameter portion and a small diameter portion are connected along the axial direction. In addition, the valve seat member 36 is formed with a plurality of negative pressure generating passages 43 around the valve seat surface, each of which has one end opening to the outer periphery surface of the large diameter portion and the other end opening to the valve seat surface of the valve seat forming hole 39. The other end opening of each negative pressure generating passage 43 forms a negative pressure generating portion 44 that generates negative pressure by the Venturi effect when the check valve 37 opens and fuel flows through the narrow portion.

[0031] The valve seat member 36 is disposed in the opening of the other opening end 2o with its valve seat surface facing downstream and in liquid-tight contact with a step surface of a mounting step 41 formed on the inner circumferential surface of the opening of the other opening end 2o of the nozzle body 3. In this case, an annular passage 42 is formed between the outer circumferential surface of the large diameter portion of the valve seat member 36 and the inner circumferential surface of the opening of the other opening end 2o of the nozzle body 3. Therefore, the annular passage 42 is in communication with a negative pressure generating section 44.

[0032] On the other hand, the joint member 38 is formed with a liquid hole 45 that penetrates the joint member 38 along the axial direction, as shown in the partially enlarged view of the dotted circled portion in FIG. 1. A columnar mounting portion 46 is supported by a plurality of legs 47 and installed in the liquid hole 45, with its axis aligned with the liquid hole 45. Bottomed mounting holes 48, 49 are opened on both axial sides of the mounting portion 46. The valve stem of the check valve 37 is inserted into the mounting hole 48 on one end side, and the check valve 37 is guided and supported so that it can be seated on and removed from the valve seat surface of the valve seat member 36. A coil-shaped spring member 51 is provided on the check valve 37, and the check valve 37 is biased in the seating direction of the valve seat member 36. One end of a negative pressure compensation pipe 52 serving as a compensation passage is fitted into the mounting hole 49 on the other end side. The check valve 37 automatically opens when it receives hydraulic pressure when the nozzle valve 5 is open and fuel is flowing through the liquid passage 2, and automatically closes when it receives hydraulic pressure when the nozzle valve 5 is closed and fuel flow is stopped, thereby preventing dripping from the discharge pipe 4 of the fuel nozzle 1 when refueling is stopped.

[0033] The outer periphery of the joint member 38 on the valve seat member 36 side is formed to have a smaller diameter than the inner periphery of the opening of the other opening end 2o of the nozzle body 3, similar to the large diameter portion of the valve seat member 36 described above, and the inner periphery is formed to have approximately the same diameter as the outer periphery of the small diameter portion of the valve seat member 36 described above. A passage 53 is formed in the leg portion 47 of the joint member 38, which communicates between the outer periphery of the valve seat member 36 side and the mounting hole 49. The joint member 38 is attached to the nozzle body 3 by pressing a flange portion formed in the axial middle portion of the outer periphery of the joint member 38 into the opening end face of the other opening end 2o of the nozzle body 3 and the portion between the flange portion and the small diameter portion described above into the opening of the other opening end 2o of the nozzle body 3, thereby positioning and fixing the valve seat member 36. In this state, the negative pressure compensating pipe 52 is configured to communicate with the annular passage 42 via the passage 53 and the outer periphery of the joint member 38 on the check valve 37 side.

[0034] The negative pressure compensating pipe 52 is extended inside the discharge pipe 4, and the other end side opens into the outer circumferential surface of the tip side of the discharge pipe 4 as an air inlet, forming a liquid level detection hole 54. The annular passage 42 also communicates with a negative pressure chamber 63 (see FIG. 2) of an automatic valve closing mechanism 61 (described later) via a passage 55 formed in the nozzle body 3. As a result, the negative pressure generating part 44, the liquid level detection hole 54, and the negative pressure chamber 63 of the automatic valve closing mechanism 61 are configured to communicate with each other via the annular passage 42.

[0035] In the case of the fuel filling nozzle of this embodiment, the tip pipe portion of the discharge pipe 4, in which the liquid level detection hole 54 is provided, and the base pipe portion connected and fixed to the joint member 38, are made of a rigid metal pipe member, and the intermediate pipe portion between these tip pipe portion and base pipe portion is made of a bendable flexible metal pipe member. Accordingly, the negative pressure compensating tube 52 is also made of a rigid metal member at the portion constituting the liquid level detection hole 54 and the connection portion fixed to the joint member 38, and the intermediate portion between these component portions of the liquid level detection hole 54 and the connection portion to the joint member 38 is made of a bendable flexible metal pipe member. As a result, the discharge pipe 4 can be kept in any bent or extended state as shown in FIG. 1, and the direction of the tip opening of the discharge pipe 4 can be changed to any direction relative to the direction of the nozzle main body 3. In addition, a locking coil 56 for preventing the fuel filling nozzle 1 from falling off from the fuel filling port is wound around the outer periphery of the discharge pipe 4, with at least one end fixed to a rigid metal pipe member on each end of the discharge pipe 4.

[0036] Next, the configuration of the automatic valve-closing mechanism 61 provided in the nozzle body 3 of the fuel filling nozzle 1 shown in Figs. 1 and 2 will be described.

[0037] 2, a valve closing mechanism accommodating hole 60 is formed in the nozzle body 3 so as to intersect with the valve shaft member insertion hole 28. This valve closing mechanism accommodating hole 60 accommodates an automatic valve closing mechanism 61 that automatically closes the nozzle valve 5 to stop the discharge of fuel from the discharge pipe 4 when the liquid level detection hole 54 provided at the tip side of the discharge pipe 4 is blocked by the liquid level or foam level of the fuel, regardless of the valve opening operation state of the operating lever 30.

[0038] The automatic valve-closing mechanism 61 includes a negative pressure chamber 63 separated from an atmospheric pressure chamber 64 by a diaphragm member 62. In the illustrated example, the diaphragm member 62 is integrally formed of a flexible diaphragm film 65 with an attachment hole formed in the center, a spring receiving member 66 arranged on the membrane surface of the diaphragm film 65 facing the negative pressure chamber 63 and with a fitting hole formed in the center, and a plate-shaped connecting member 67 with fitting portions protrudingly formed on both axial sides. The diaphragm member 62 is configured such that the diaphragm film 65 is sandwiched integrally between the connecting member 67 and the spring receiving member 66 by inserting the fitting portions formed on one axial side of the connecting member 67 into the attachment hole of the diaphragm film 65 and fitting into the fitting hole of the spring receiving member 66.

[0039] The negative pressure chamber 63 is defined from the outside by a cover member 68 attached so as to sandwich the peripheral portion of a diaphragm membrane 65 of a diaphragm member 62 disposed so as to cover one opening of the valve-closing mechanism accommodating hole 60 between the cover member 68 and the nozzle body 3. The other end of the passage 55, one end of which is communicated with the annular passage 42 as described in FIG. 1, is communicated with this negative pressure chamber 63. A spring member 69 for restoring the diaphragm member 62 deflected by the operation of the automatic valve-closing mechanism 61 is provided in the negative pressure chamber 63 between a spring receiving member 66 and the bottom of the cover member 68.

[0040] As a result, when the negative pressure chamber 63 is in an atmospheric pressure state where it is not under negative pressure and the engagement rod 27 is engaged with both the stem sleeve 20 of the valve stem member 19 and the stem rod 22, as shown in Figure 2, the spring force of the spring member 69 causes the diaphragm member 62 to be in a state in which the spring receiving member 66 and the connecting member 67 are located at the innermost side within the valve-closing mechanism accommodating hole 60.

[0041] A U-shaped engaging rod guide member 70 is attached integrally to the fitting portion formed on the other axial side of the connecting member 67. The engaging rod guide member 70 is U-shaped and has a pair of side plate portions and a connecting plate portion connecting the pair of side plate portions. The connecting plate portion is formed with an insertion hole through which the fitting portion formed on the other axial side of the connecting member 67 is inserted. Each of the pair of side plates is formed with a guide hole 71 with which the end of the engaging rod 27 engages, as shown in FIG. 1. The guide hole 71 is shaped like an elongated hole, and restricts the engaging rod 27 from moving relative to the engaging rod guide member 70 along the axial direction of the connecting member 67, while allowing the engaging rod 27 to move relative to the engaging rod guide member 70 by a predetermined distance, i.e., the valve opening stroke of the main valve body 10 and the sub-valve body 11 that constitute the nozzle valve 5, along the axial direction of the valve shaft member 19.

[0042] In the illustrated example, the engagement rod guide member 70 is attached integrally to the diaphragm member 62 by fitting the fitting portion on the other axial side of the connecting member 67 into the insertion hole of the connecting plate portion with the engagement rod 27 engaged with a pair of guide holes 71.

[0043] As shown in FIG. 2, the integrated diaphragm member 62 and engaging rod guide member 70 are attached by screwing the cover member 68 to the nozzle body 3 with the engaging rod 27 engaged in the guide hole 71 facing the engaging hole 72 of the stem sleeve 20 in the valve stem member 19 and the engaging groove 73 of the stem rod 22, and the peripheral portion of the diaphragm membrane 65 of the diaphragm member 62 being sandwiched between the nozzle body 3.

[0044] On the other hand, the stem sleeve 20 and the stem rod 22 constituting the stem member 19 are formed with an engagement hole 72 and an engagement groove 73 in which the engagement rod 27 can be engaged, at the midway point in the length direction. The axial width of the engagement hole 72 formed in the stem sleeve 20 is substantially equal to the sum of the diameters of the engagement rods 27, 27. On the other hand, the axial width of the engagement groove 73 formed in the stem rod 22 is formed larger than the axial width of the engagement hole 72 by the distance between the shoulder 25 of the stem sleeve 20 and the main valve element 10 of the main valve 7 when both the main valve element 10 and the sub-valve element 11 of the main valve 7 are closed, that is, the opening stroke of the sub-valve element 11 relative to the main valve element 10. When the automatic valve closing mechanism 61 is not in operation, the engagement rods 27, 27 held in the guide hole 71 of the engagement rod guide member 70 are engaged with both the engagement hole 72 and the engagement groove 73 by the biasing force of the spring member 69, as shown in FIG. 2.

[0045] Therefore, according to the fuel nozzle 1 of this embodiment, when the fuel nozzle 1 is removed from the nozzle storage location and the liquid delivery means such as a pump is already activated, if the operation lever 30 of the fuel nozzle 1 is operated to open the valve, the valve stem sleeve 20 and the valve stem rod 22 of the valve stem member 19 are displaced integrally toward the nozzle valve 5 along the axial direction. This displacement causes the main valve 7 to open, in the order of the sub-valve body 11 and the main valve body 10, and fuel is discharged from the discharge pipe 4 of the fuel nozzle 1 by opening the check valve 37 at a flow rate per unit time according to the valve opening operation amount of the operation lever 30. At this time, if the free end 30A of the operation lever 30 is placed on the step portion of the lever hook 34 corresponding to the valve opening degree, the valve open position of the main valve 7 can be maintained even if the hand is released from the operation lever 30.

[0046] Thereafter, when the liquid level detection hole 54 at the tip of the discharge pipe 4 becomes blocked by the fuel liquid level or foam level while the fuel is being refueled, the automatic valve closing mechanism 61 is activated and the automatic discharge of oil from the fuel nozzle 1 is stopped regardless of the operating state of the operating lever 30.

[0047] Specifically, when the liquid level detection hole 54 is blocked by the liquid level or foam level of the fuel, the negative pressure generated by the Venturi effect in the negative pressure generating section 44 cannot be compensated for, and the negative pressure chamber 63 goes from an atmospheric pressure state to a negative pressure state. At that time, due to the pressure difference generated between the negative pressure chamber 63 and the atmospheric pressure chamber 64, the diaphragm member 62 is engaged in a direction perpendicular to the axial direction of the valve shaft member 19, i.e., in the axial direction of the diaphragm member 62, and is deflected and displaced toward the cover member 68, so as to contract the negative pressure chamber 63 against the biasing force of the spring member 69. As a result, the engaging rod guide member 70 attached integrally to the diaphragm member 62 is displaced so as to move away from the valve shaft member 19 in conjunction with the displacement of the diaphragm member 62. As a result, the engaging rods 27, 27 which have entered and engaged with both the engaging hole 72 of the stem sleeve 20 and the engaging groove 73 of the stem rod 22 are retracted from the engaging groove 73 of the stem rod 22 and are now engaged only with the engaging hole 72 of the stem sleeve 20, and the stem sleeve 20 is disengaged from the stem rod 22.

[0048] When the engagement between the valve stem sleeve 20 and the valve stem rod 22 is released, the valve stem sleeve 20 alone moves, while leaving the valve stem rod 22 in place, to a position closest to the operating lever 30 along the axial direction of the valve stem member insertion hole 28, against the biasing force of the spring member 26, due to the biasing force of the spring member 18 acting on the sub-valve element 11 of the main valve 7 and the hydraulic pressure of the fuel supplied from the liquid delivery means to one opening end (coupling side), thereby closing the main valve element 10 and sub-valve element 11 of the main valve 7 and stopping the discharge of fuel from the discharge pipe 4.

[0049] Furthermore, if it is necessary to supply additional fuel to the refueling target after this automatic valve-closing mechanism 61 has been activated, for example, the liquid delivery means will still be in an operating state unless the refueling nozzle 1 is returned to the nozzle storage location, so if the operating lever 30 is simply returned to the valve-closing position once, the refueling nozzle 1 will be in the same state as when it is removed from the nozzle storage location with the operating lever 30 not being operated to open the valve, and additional fuel can be supplied by simply operating the operating lever 30 to open the valve again.

[0050] Furthermore, in the fuel nozzle 1 of this embodiment, the automatic valve-closing mechanism 61 is provided with a lock mechanism 81 that can selectively set the operation of the automatic valve-closing mechanism 61 during refueling to a permitted state or a prohibited state. If the operation of the automatic valve-closing mechanism 61 is prohibited by the lock mechanism 81, the operation of refueling the target does not require the repeated operation of operating the operating lever to close the valve and then to open the valve again each time the automatic valve-closing mechanism 61 closes the valve. Next, the configuration of the lock mechanism 81 will be described with reference to the drawings.

[0051] FIG. 3 is a cross-sectional view of an example of a lock mechanism provided in the automatic valve-closing mechanism of the fuel filling nozzle according to this embodiment, and a cross-sectional view of an example of a guide cover provided in the lock mechanism of this embodiment. FIG. 4 is an external view of the lock mechanism and the guide cover shown in FIG. FIG. 5 is an external view of the lock mechanism with the guide cover attached.

[0052] The lock mechanism 81 includes a base 82, a lock shaft 83, and an operating piece 84. In the illustrated example, the base 82 is formed in a stepped disk shape in which a small diameter portion 82s and a large diameter portion 82l are connected together. Inside the base 82, a shaft support hole 85 for supporting the lock shaft 83 relative to the base 82 is provided extending along the axial direction of the base 82.

[0053] The lock shaft 83 is inserted into a shaft support hole 85 of the base 82. The lock shaft 83 is loosely fitted into the shaft support hole 85 and supported by the base 82 so as to be movable along the axial direction of the shaft support hole 85, i.e., the base 82, and rotatable about the hole axis of the shaft support hole 85.

[0054] One end of the shaft support hole 85 communicates with a connecting chamber 86 recessed in the end face of the base 82 on the side of the small diameter portion 82s, and one end of the lock shaft 83 projects into the connecting chamber 86. The other end of the shaft support hole 85 communicates with a lid chamber 87 recessed in the end face of the base 82 on the side of the large diameter portion 82l, and the other end of the lock shaft 83 projects into the lid chamber 87. The interior of the lid chamber 87 is kept airtight from the interior of the connecting chamber 86, i.e., from the outside of the lock mechanism 81, by an O-ring 89 provided in the shaft support hole 85 through which the lock shaft 83 is inserted.

[0055] In the illustrated example, the shaft support hole 85, together with the adjacent connecting chamber 86 and lid chamber 87, constitutes a lock shaft guide hole 88 in the base 82. In the illustrated example, this lock shaft guide hole 88 is configured such that the lid chamber 87 is recessed into the end face of the base 82 on the large diameter portion 82l side, but it is also possible to configure the other end side of the shaft support hole 85 to open directly into the end face of the base 82 on the large diameter portion 82l side, and not include the lid chamber 87.

[0056] A peripheral wall of the small diameter portion 82s of the base 82, into which a connecting chamber 86 is formed with one end side of the lock shaft 83 protruding, is provided with an operation piece guide hole 90 that penetrates the peripheral wall and through which the operation piece 84 can be inserted. The operation piece guide hole 90 has an elongated hole shape that extends through the peripheral wall of the small diameter portion 82s of the base 82 along the circumferential direction of the lock shaft 83 by a length corresponding to a predetermined rotation angle θ around the lock shaft 83. In the illustrated example, the operation piece guide hole 90 has an elongated hole shape that extends through the peripheral wall of the small diameter portion 82s of the base 82 by a length corresponding to approximately 180° around the lock shaft 83.

[0057] Furthermore, the operation piece guide hole 90 also has an elongated hole shape extending spirally around the peripheral wall of the small diameter portion 82s of the base 82, such that its position along the axial direction of the base 82 changes continuously along the axial direction of the base 82 depending on the circumferential position on the peripheral wall of the small diameter portion 82s. As a result, between the positions of both ends in the hole length direction of the operation piece guide hole 90, i.e., the hole length positions of the operation piece guide hole 90 corresponding to 0° and approximately 180° of the hole length corresponding to approximately 180° around the lock shaft 83, the distance from the large diameter portion 82l along the axial direction of the base 82, i.e., the hole axial direction of the shaft support hole 85, is shifted by a predetermined distance d.

[0058] In the illustrated example, the operation piece 84 is configured from a rod-shaped member, is inserted into the connecting chamber 86 from outside the small diameter portion 82s of the base 82 through the operation piece guide hole 90, and is fixed to the lock shaft 83 by, for example, screwing the inserted end side to the lock shaft 83. The free end side of the operation piece 84 integrated with the lock shaft 83 protrudes outward from the operation piece guide hole 90 toward the outside of the small diameter portion 82s and serves as an operation part for the lock mechanism 81. In the illustrated example, the operation part of the lock mechanism 81 is rotatable along the disk surface of the stepped disk-shaped base 82 in a direction perpendicular to the axis of the lock shaft 83.

[0059] Therefore, in the lock mechanism 81, the operation piece 84 can be guided and moved along the operation piece guide hole 90 between both end positions in the longitudinal direction of the elongated hole shape of the operation piece guide hole 90. This allows the operation piece 84 to be rotated a predetermined rotation angle θ (approximately 180° in this embodiment) on the base 82, and this rotational displacement of the operation piece 84 through the predetermined rotation angle θ allows the lock shaft 83 integrated with the operation piece 84 to be moved and displaced a predetermined distance d along its axial direction.

[0060] The lock mechanism 81 configured in this manner is attached and fixed by screwing the large diameter portion 82l to the nozzle body 3 so that the peripheral end surface of the large diameter portion 82l holds the peripheral portion of the diaphragm membrane 65 of the diaphragm member 62 arranged to cover one side opening of the valve-closing mechanism accommodating hole 60 of the nozzle body 3, as shown in Fig. 2. In this embodiment, the base 82 of the lock mechanism 81 also serves as the lid member 68 that defines the negative pressure chamber 63 in the nozzle body 3. In a state where the lock mechanism 81 is attached and fixed to the nozzle body 3, the other end side of the lock shaft 83 can be displaced forward and backward by a predetermined distance d relative to the diaphragm member 62 in the axial direction of the diaphragm member 62, which is also the axial direction of the lock shaft 83, within the negative pressure chamber 63 in response to a rotation operation of the operating piece 84 by a predetermined rotation angle θ.

[0061] The movement displacement distance (predetermined distance d) of the lock shaft 83 by which the other end side of the lock shaft 83 is advanced or retreated within the negative pressure chamber 63 is related to the groove depth f of the engagement groove 73 of the valve shaft rod 22 with which the engagement rod 27 engages in the automatic valve-closing mechanism 61, and has a movement displacement distance d such that in the most forward state within the negative pressure chamber 63, the distance between the other end side of the lock shaft 83 and the diaphragm member 62 is smaller than f, preferably 1 / 2*f or less, and in the most backward state within the negative pressure chamber 63, the distance between the other end side of the lock shaft 83 and the diaphragm member 62 is f or more.

[0062] As a result, when the other end side of the lock shaft 83 is in the most forward position within the negative pressure chamber 63, even if the liquid level detection hole 54 is blocked by fuel or fuel bubbles and the negative pressure chamber 63 is in a negative pressure state during refueling of the fuel tank to be refueled, the displacement of the diaphragm member 62 is restricted by the other end side of the lock shaft 83, so the engaging rod 27 does not come out of the engaging groove 73 of the valve stem rod 22, and operation of the automatic valve closing mechanism 61 can be prohibited. On the other hand, when the other end side of the lock shaft 83 is in the most backward position within the negative pressure chamber 63, when the liquid level detection hole 54 is blocked by fuel or fuel bubbles and the negative pressure chamber 63 is in a negative pressure state during refueling of the fuel tank to be refueled, the displacement of the diaphragm member 62 is not restricted by the other end side of the lock shaft 83, so the engaging rod 27 can come out of the engaging groove 73 of the valve stem rod 22, and operation of the automatic valve closing mechanism 61 can be permitted.

[0063] Furthermore, in the fuel filling nozzle 1 of this embodiment, a guide cover 91 can be attached to the locking mechanism 81 to notify that the locking mechanism 81 is not restricting the displacement of the diaphragm member 62 that constitutes the automatic valve-closing mechanism 61 at the other end side of the locking shaft 83 and is in a state in which the automatic valve-closing mechanism 61 is allowed to operate.

[0064] The guide cover 91 is made of a cylindrical member that can be detachably fitted to the small diameter portion 82s of the base 82 of the lock mechanism 81, and a substantially U-shaped notch guide portion 92, in which the operation piece 84 of the lock mechanism 81 can move along the notch length direction, is formed at a predetermined position along the circumferential direction of the peripheral surface of the guide cover 91 along the cylindrical axis direction as shown in Figs. 3 to 5. The notch guide portion 92 allows the operation piece 84, which protrudes outward from the operation piece guide hole 90 of the lock mechanism 81 toward the small diameter portion 82s of the base 82, to be prevented from interfering with the guide cover 91, and the guide cover 91 can be attached to the small diameter portion 82s so as to be rotatable together with the operation piece 84. In Figs. 4 and 5, Figs. 4(B) and 5(B) are views of the lock mechanism 81 and the guide cover 91 as viewed in the direction of the arrow BB shown in Figs. 4(A) and 5(A).

[0065] Furthermore, a positioning protrusion 93 that can be engaged with the notched guide portion 92 of the guide cover 91 is formed on the outer peripheral surface of the small diameter portion 82s of the base 82 of the lock mechanism 81 to which the guide cover 91 is attached. As a result, the guide cover 91 can be firmly attached to the small diameter portion 82s to the axially innermost portion of the small diameter portion 82s by arranging the operation piece 84 and the positioning protrusion 93 in the notched guide portion 92. In this case, the operation piece 84 and the positioning protrusion 93 are aligned in the same row along the axial direction of the base 82, and the notched guide portion 92 of the guide cover 91 also engages with the positioning protrusion 93, so that the operation piece 84 and the positioning protrusion 93 cannot be rotated together with the operation piece 84 relative to the small diameter portion 82s of the base 82. Therefore, the guide cover 91 also prevents the operation piece 84 from being displaced along the operation piece guide hole 90, i.e., prevents the operation piece 84 from being rotated. As a result, the position of the operation piece 84 on the operation piece guide hole 90 is locked at a predetermined position determined by the positioning protrusion 93. In the illustrated example, the other end of the lock shaft 83 of the lock mechanism 81 is locked in the most retracted position within the negative pressure chamber 63, which allows the automatic valve-closing mechanism 61 to operate.

[0066] Therefore, when the operating piece 84 and the positioning protrusion 93 are aligned in the same row along the axial direction of the base 82, that is, when the locking mechanism 81 is in a switching operation state in which the automatic valve-closing mechanism 61 is activated, the cutout guide portion 92 of the guide cover 91 is engaged with the positioning protrusion 93, so that the operating piece 84 of the locking mechanism 81 cannot be rotated and the fuel nozzle 1 is locked in a state in which the automatic valve-closing mechanism 61 is activated.

[0067] In contrast, when the operation piece 84 and the positioning protrusion 93 are not aligned in the axial direction of the base 82, the notch guide portion 92 of the guide cover 91 cannot engage with the positioning protrusion 93, so that the operation piece 84 of the lock mechanism 81 of the fuel filling nozzle 1 can be rotated integrally with the guide cover 91, and the lock mechanism 81 can switch to refueling with the operation of the automatic valve-closing mechanism 61 prohibited. In this switching operating state of the lock mechanism 81 that prohibits the operation of the automatic valve-closing mechanism 61, the operation piece 84 and the positioning protrusion 93 are not aligned in the axial direction of the base 82 and the notch guide portion 92 of the guide cover 91 cannot engage with the positioning protrusion 93, so that the state in which the operation of the automatic valve-closing mechanism 61 is prohibited is not locked by the lock mechanism 81.

[0068] In addition, an "ON" sign 94 is attached to the peripheral surface of the guide cover 91 in a position which appears in view when the lock mechanism 81 is in a switched operating state in which the automatic valve-closing mechanism 61 is activated, and which disappears from view when the lock mechanism 81 is in a switched operating state in which the operation of the automatic valve-closing mechanism 61 is prohibited. This sign 94 indicates that the lock mechanism 81 is in a switched operating state in which the automatic valve-closing mechanism 61 is prohibited from operating.

[0069] As a result, when the automatic valve-closing mechanism 61 is locked in an operating state, the notched guide portion 92 of the guide cover 91 is engaged with the positioning protrusion 93, so even if an operator who is unfamiliar with refueling operations with the automatic valve-closing mechanism 61 prohibited from operating is attempting to perform refueling operations with the automatic valve-closing mechanism 61 prohibited from operating, the operation piece 84 of the locking mechanism 81 cannot be rotated as it is, so that the operator can be automatically guided to a fuel supply operation with the automatic valve-closing mechanism 61 operating. Also, when the locking mechanism 81 is in a switching operating state that prohibits the operation of the automatic valve-closing mechanism 61, the position where the "ON" sign 94 has disappeared from the field of view, i.e., the switching operating state, becomes unclear, but in this case, the notched guide portion 92 of the guide cover 91 is not engaged with the positioning protrusion 93, so the operation piece 84 of the locking mechanism 81 can be rotated as it is, so that it is easy to know which of the two states the operator is in from the appearance or disappearance of the "ON" sign 94 in the field of view based on the rotation operation of the operation piece 84.

[0070] Next, the operation of the fuel supply nozzle 1 of this embodiment will be described with reference to FIGS. Fig. 6 is an external view of the fuel nozzle shown in Fig. 1. Fig. 6 shows a state in which a nozzle cover, not shown in Fig. 6, is attached to the nozzle body. Fig. 7 is an external view of the lock mechanism as viewed from the direction of the arrow cc in Fig. 6.

[0071] As shown in Fig. 6, in the fuel filling nozzle 1 of this embodiment, the lock mechanism 81 is provided in the automatic valve-closing mechanism 61 provided in the nozzle body 3, so that the operation piece 84 rotates in a plane approximately parallel to the side surface of the nozzle body 3, on a side portion of the nozzle body 3 in front of the nozzle body gripping portion 32. As shown by the dotted arrow in the figure, the operation piece 84 rotates while being guided by an operation piece guide hole 90 provided in the base 82 by a predetermined rotation angle θ, in the illustrated case, by 180°, so that the operation piece 84 is not hidden by the base 82 when viewed from the direction of the arrow cc. In the figure, the rotation position of the operation piece 84 shown by the solid line corresponds to the rotation position of the operation piece 84 corresponding to the switching operation state in which the automatic valve-closing mechanism 61 operates, and the rotation position of the operation piece 84 shown by the dashed line corresponds to the rotation position of the operation piece 84 in the switching operation state in which the operation of the automatic valve-closing mechanism 61 is prohibited.

[0072] 7(A) corresponds to a view of the operation piece 84 in a rotation position corresponding to the switching operation state in which the automatic valve-closing mechanism 61 operates, shown by a solid line in FIG. 6, together with the guide cover 91, viewed from the direction of the arrow cc in FIG. 6. As shown in FIG. 7(A), in the rotation position corresponding to the switching operation state in which the automatic valve-closing mechanism 61 operates, the operation piece 84 is in a state in which its free end faces the discharge pipe 4 side. In addition, since the operation piece 84 and the positioning protrusion 93 of the guide cover 91 are aligned along the axial direction of the base 82, the guide cover 91 can be attached by engaging with the positioning protrusion 93, and the operation piece 84 in the rotation position corresponding to the switching operation state in which the automatic valve-closing mechanism 61 operates can be locked so as not to be rotated. In this case, when the attached guide cover 91 is viewed from the direction of the arrow cc in FIG. 6, the "ON" sign 94 appears in the field of view.

[0073] In this way, the switching operation state in which the automatic valve-closing mechanism 61 operates can be easily identified by the free end of the operating piece 84 facing the discharge pipe 4. Furthermore, by attaching the guide cover 91, the operating piece 84 can be prevented from rotating accidentally, improving operational safety. When viewed from the direction of the arrow cc in Figure 6, that is, from the gripping side of the nozzle body grip portion 32 of the fuel filling nozzle 1, the "ON" sign 94 appears within the field of view, so it can be easily understood that the switching operation state in which the automatic valve-closing mechanism 61 operates is in operation.

[0074] FIG. 7(B) corresponds to a view of the operation piece 84 in a rotation position corresponding to the switching operation state in which the automatic closing mechanism 61 is prohibited from operating, as shown by the broken line in FIG. 6, together with the guide cover 91, as viewed from the direction of the arrow cc in FIG. 6. As shown in FIG. 7(B), in the rotation position corresponding to the switching operation state in which the automatic closing mechanism 61 is prohibited from operating, the free end of the operation piece 84 faces the nozzle body grip part 32 side opposite to the discharge pipe 4 side. In addition, since the operation piece 84 and the positioning protrusion 93 of the guide cover 91 are not aligned along the axial direction of the base 82, the guide cover 91 cannot be attached by engaging with the positioning protrusion 93, and the operation piece 84 in the rotation position corresponding to the switching operation state in which the automatic closing mechanism 61 is prohibited from operating cannot be locked from being rotated. In this case, when the attached guide cover 91 is viewed from the direction of the arrow cc in FIG. 6, the "ON" sign 94 disappears from view.

[0075] In this way, the switching operation state in which the automatic valve-closing mechanism 61 is prohibited from operating can be easily identified because the free end of the operation piece 84 faces the nozzle body grip portion 32 side, which is the opposite direction to the switching operation state in which the automatic valve-closing mechanism 61 operates. Furthermore, since the rotation of the operation piece 84 is not locked by attaching the guide cover 91, the switching operation state can be easily confirmed by rotating the operation piece 84, improving work safety. When viewed from the direction of the arrow cc in Fig. 6, that is, from the grip side of the nozzle body grip portion 32 of the fuel nozzle 1, the "ON" sign 94 is out of sight, so it can be easily understood that the switching operation state in which the automatic valve-closing mechanism 61 does not operate is being established.

[0076] FIG. 7C is an external plan view of the lock mechanism shown in FIG.

[0077] According to the fuel filling nozzle 1 of the present embodiment, the operational displacement of the operating piece in the locking mechanism 81 can be made significant, as represented by θ in FIG. 7(C), without interfering with the refueling operation, by utilizing the rotational displacement of the operating piece 84 guided by the spiral operating piece guide hole 90 in the base 82 from the displacement amount corresponding to the forward and backward displacement of the other end of the locking shaft 83 in the axial direction of the diaphragm member 62 within the negative pressure chamber 63 described in FIG. 2, as represented by θ in FIG. 7(C).

[0078] Therefore, with the discharge pipe 4 inserted into the fuel filling port of the fuel tank, the switching operation of the lock mechanism 81 and the confirmation of the switching operation status can be performed without interference from other parts, thereby improving the workability of the refueling operation.

[0079] The liquid supply nozzle according to the present disclosure is applicable to any liquid supply nozzle equipped with an automatic valve closing mechanism that closes the nozzle valve by utilizing negative pressure generated by the Venturi effect of fuel flowing inside the nozzle body, without being limited to the specific configuration of the automatic valve closing mechanism or the specific configuration and form of each part of the liquid supply nozzle. For example, in the above-mentioned embodiment, the discharge pipe 4 of the fuel supply nozzle 1 is configured to be bent arbitrarily to a desired degree of bending by utilizing a flexible metal pipe member, but the discharge pipe may be configured to remain unbent while maintaining a specified degree of bending. [Explanation of symbols]

[0080] 1 refueling nozzle, 2 liquid passage, 2i One side open end (joint side), 2o other open end (discharge pipe side), 3 Nozzle body, 4 discharge pipe, 5 nozzle valve, 6 valve seat, 7 Main valve, 8 mounting opening, 9 Lid body, 10 Main valve body, 11 Sub-valve body, 13 Valve body passage, 14 Valve stem insertion hole, 15 Valve stem, 16 valve seat, 17 Rod insertion hole, 18 Spring member, 19 Valve shaft member, 20 Valve stem sleeve, 21 sleeve hole, 22 Valve stem rod, 23 Insertion rod part, 24 Sleeve section, 25 shoulder area, 26 Spring member, 27 Engagement rod, 28 Valve shaft member insertion hole, 29 Sealing member, 30 Operating lever, 32 nozzle body gripping portion, 33 Lever guard, 34 Lever hook, 36 valve seat member, 37 Check valve, 38 Joint members, 39 Valve seat formation hole, 41 Mounting step, 42 Circular passage, 43 negative pressure generating passage, 44 negative pressure generating unit, 45 liquid hole, 46 mounting portion, 47 legs, 48,49 Mounting holes, 52 negative pressure compensator tube, 53 aisle, 54 Liquid level detection hole, 55 aisles, 56 Retaining coil, 60 valve closing mechanism receiving hole, 61 Automatic valve closing mechanism, 62 Diaphragm member, 63 negative pressure chamber, 64 Atmospheric chamber, 65 Diaphragm membrane, 66 Spring support member, 67 Connecting members, 68 Cover member, 69 Spring members, 70 Engagement rod guide member, 71 Guide hole, 72 engagement hole, 73 engagement groove, 81 Locking mechanism, 82 Foundations, 82s small diameter section, 82l Large diameter section, 83 Lock axis, 84 Operation piece, 85 shaft support hole, 86 connection room, 87 Cap chamber, 88 Lock shaft guide hole, 89 O-ring, 90 Operation piece guide hole, 91 Guide cover, 92 Cutout guide, 93 Positioning protrusion, 94 “ON” sign.

Claims

1. a fluid passage extending through the nozzle body; a valve body that is disposed so as to be able to seat on and separate from a valve seat disposed in the liquid passage and that opens and closes the liquid passage; a discharge pipe connected to the other open end of the liquid passage in the nozzle body; an operating lever for operating the valve body to open and close the valve; a valve shaft mechanism that connects the valve body and the operating lever and moves the valve body to and from the valve seat in response to an opening / closing operation of the operating lever; an automatic valve-closing mechanism that is attached to the valve stem mechanism and that seats the valve body on the valve seat by releasing the connection between the valve body and the operating lever via the valve stem mechanism even when the operating lever is in a valve-opening operating state; A fuel nozzle comprising: The automatic valve closing mechanism includes: A negative pressure chamber defined by a movable partition; a negative pressure generating section that generates a negative pressure by a flow of fuel in a state in which the fuel flows in from the one open end of the liquid passage and flows out from the discharge pipe; a negative pressure passage having one end communicating with the negative pressure generating portion and the other end communicating with the negative pressure chamber; a compensation passage having one end communicating with an air inlet port provided in the discharge pipe and the other end communicating with the negative pressure chamber; having when the negative pressure generating section is in a negative pressure generating state and the atmosphere inlet of the compensation passage is blocked by fuel or bubbles, the movable partition is displaced based on a chamber pressure change in the negative pressure chamber to release the connection between the valve body and the operating lever via the valve shaft mechanism, and the valve body is seated on the valve seat, The automatic valve closing mechanism includes: a lock mechanism is provided to permit or prohibit displacement of the movable partition wall based on a pressure change in the negative pressure chamber; The locking mechanism includes: A lock shaft extending along a displacement direction of the movable partition wall; An operation piece attached to the lock shaft and extending in a radial direction of the lock shaft; a base that guides a rotational displacement of the operation piece around the lock shaft as a rotation shaft and guides a moving displacement of the operation piece along an axial direction of the lock shaft in response to the rotational displacement of the operation piece; having the base is attached to the nozzle body such that an axial direction of the lock shaft in the lock mechanism is aligned with a displacement direction of the movable partition wall in the automatic valve-closing mechanism, and an axial end of the lock shaft is moved toward or away from the movable partition wall, The lock shaft has a guide cover is provided to indicate that the operating piece is in an operating state that allows the movable partition to be displaced; the guide cover is provided with an engagement portion for engaging with a locking portion provided on the operation piece and the base, When the operation piece is attached to the lock shaft, the operation piece is prevented from rotating. Refueling nozzle.

2. The fuel nozzle according to claim 1, The base is a lock shaft guide hole into which the lock shaft is loosely fitted; a guide slot formed in a peripheral wall of the lock shaft guide hole so as to extend helically along a peripheral surface of the lock shaft guide hole, the guide slot allowing the operation piece of the lock mechanism to be inserted therethrough; Equipped with The locking mechanism includes: By rotating and displacing the operation piece along the guide elongated hole, the lock shaft is moved and displaced along the hole axial direction of the lock shaft guide hole. Refueling nozzle.

3. The fuel nozzle according to claim 1, The base is The nozzle body also serves as a negative pressure chamber cover that seals the negative pressure chamber from the outside. Refueling nozzle.

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