JP6635407B2 - Automatic tank filling nozzle - Google Patents

Description

  The present invention relates to a refueling nozzle having a refueling control function for automatically stopping refueling when a liquid level of fuel oil supplied to an automobile fuel tank reaches a full level.

  As one of the refueling nozzles provided with a refueling control function for automatically stopping refueling when the liquid level reaches a full level, the automatic valve is reliably closed even when the flow rate is reduced as shown in Patent Document 1. An oil supply nozzle capable of operating a mechanism to perform a valve closing operation has been proposed.

  That is, a main valve that is opened to the refueling lever, a check valve that is arranged downstream of the main valve and opens by the pressure of the liquid, and an air pipe having one end communicating with the nozzle cylinder tip 10 and a downstream of the check valve. A refueling nozzle having an automatic valve closing mechanism that communicates with the negative pressure generating region and closes the main valve by a predetermined negative pressure, wherein the check valve has a large diameter main check valve element, and a central axis of the main check valve element. It is constituted by a small-diameter sub-check valve body located on the upper side, and the downstream side of the sub-check valve body is connected to the other end of the air pipe and the automatic valve closing mechanism.

  In this refueling nozzle, the sphere constituting the sub-check valve element slightly swings under the influence of the elasticity of the spring and the pressure of the flow. However, in the case of refueling (40 L / min) to the fuel tank of a normal passenger car, the sphere is used. Fluctuation of the automatic valve closing mechanism due to spring fatigue and turbulence is not a problem in practical use, but large flow refueling (65 L / (min or more), there is a risk that the above-mentioned sphere swings greatly, shortens the life of the spring, and the negative pressure generated by the turbulence of the flow becomes unstable, and the operation of the automatic valve closing mechanism becomes unstable. there were.

Patent No. 3379543

The invention of the present application is directed to a main valve that is opened by a refueling lever, a check valve that is arranged downstream of the main valve and opens by the pressure of the liquid that has passed through the main valve, and one end of which communicates with the nozzle tip. An automatic valve closing mechanism that closes the main valve by receiving a predetermined negative pressure and communicating with an air pipe to be closed and a negative pressure generating region provided on the downstream side of the check valve, wherein the check valve has a large diameter. And a small-diameter sub-check valve body located on the center axis of the main check valve body, and the negative pressure generation region is disposed downstream of the sub-check valve body. At the nozzle
The tornado-like flow to the secondary check valve body the valve seat downstream of flow path of together with spheres which constitute the valve body of the auxiliary check valve body is normally biased to a valve seat by a spring which is disposed downstream And a guide member capable of covering the moving range of the sphere is provided.

  The invention of the present application is directed to a main valve that is opened by a refueling lever, a check valve that is arranged downstream of the main valve and opens by the pressure of the liquid that has passed through the main valve, and one end of which communicates with the nozzle tip. An automatic valve closing mechanism that closes the main valve by receiving a predetermined negative pressure and communicating with an air pipe to be closed and a negative pressure generating region provided on the downstream side of the check valve, wherein the check valve has a large diameter. And a small-diameter sub-check valve body located on the center axis of the main check valve body, wherein the negative pressure generation region is disposed downstream of the sub-check valve body. In the nozzle, the sphere constituting the valve body of the sub-check valve body is constantly urged to the valve seat by a spring disposed on the downstream side, and a tornado-like shape is formed in a flow path downstream of the valve seat of the sub-check valve body. A guide member for generating the flow of air is provided.

According to the first aspect of the present invention, the movement of the spherical body constituting the sub-check valve body in the direction orthogonal to the flow is restricted by the guide means, and unnecessary swing is suppressed. Can be prevented.
Since the liquid discharged from the sub-check valve element is guided by the guide means and flows through the negative pressure generating means while turning, the flow density in the flow path becomes as uniform as possible, and a stable negative pressure is generated to automatically close. It is possible to cause the valve mechanism to perform a reliable valve closing operation.

Sectional drawing which expands and shows the vicinity of the check valve which comprises the nozzle for automatic full tank refueling of this invention. The figure which shows one Example of the nozzle for automatic full tank refueling of this invention. The figure which shows the guide member of the flow path which comprises a sub-check valve body in the state seen from the downstream. The figure which shows the cross-section of the guide member of the flow path which comprises a sub-check valve body. The figure which shows the guide member of the flow path which comprises a sub-check valve body in the state seen from the downstream. The figure which shows typically the flow of the downstream side of a sub-check valve body. (A) (B) is a figure which shows the 2nd Example of this invention by the structure of the auxiliary | assistant check valve seen from the upstream and downstream sides, respectively.

Therefore, the details of the present invention will be described below based on the illustrated embodiment.
FIG. 2 shows an embodiment of a refueling nozzle according to the present invention. As shown in Patent Document 1, a flow path from a nozzle cylinder tip 10 to a refueling hose connecting portion 21 of a body (main body) 20 is formed. Is provided with a main valve 23 that is opened and closed by a refueling lever 22, and an automatic valve closing mechanism 30 that closes the main valve 23 when the liquid injected into the tank reaches the nozzle tip 10. .

  The automatic valve closing mechanism 30 includes a diaphragm that is displaced by the action of a negative pressure, as is well known, and a spring that urges the diaphragm in a direction against displacement when a negative pressure is applied to the diaphragm, The top holding the main valve in the open state is retracted by the displacement of the diaphragm to return to the closed state.

  The check valve 40, which is a feature of the present invention, is configured as a two-piece structure having a large-diameter main check valve element 41 and a small-diameter sub-check valve element 45 as shown in FIG. The main check valve body 41 is disposed coaxially so as to substantially coincide with the center axis A of the valve seat 44.

The main check valve body 41 is urged by the first spring 42 in a direction to maintain the valve closed state, that is, in the direction of the valve seat 44.
On the other hand, the sub-check valve body 45 is formed of a sphere abutting on a through-hole 43 formed at the center of the valve seat 44 of the main check valve body 41, and has a second spring 47, more specifically, a small-diameter cone-shaped upstream side. It is supported by the tip of the coil spring and is always urged to the extent that it can be opened at a pressure lower than the main check valve body 41 in the upstream side, that is, in the valve closing direction.

  A jet nozzle 50 communicates with the downstream side of the sub-check valve body 45, and its tip is opposed to the upstream opening of the diffuser pipe 51 extending to near the boundary between the nozzle tip 10 and the body 20, and the boundary between the two. A negative pressure generating region is formed so that a negative pressure is generated in the negative pressure generating region. That is, the area where the ejection nozzle 50 and the diffuser pipe 51 face each other constitutes a negative pressure generating area 55, that is, a negative pressure generating means. The rear end of the air pipe 52, that is, the main valve side, and the automatic valve closing mechanism 30 are communicated with each other in the negative pressure generating area, so that a negative pressure can be applied to the diaphragm of the automatic valve closing mechanism. I have.

  In this embodiment, when the fuel supply lever 22 is pulled up and locked in the notch of the lever guard 23, the main valve 23 is opened. As a result, the pressure of the liquid acts on the main check valve 41 and the sub-check valve 45, so that the main and sub-check valve 41, 45 are opened against the springs 42, 47, respectively, and the main check valve is opened. The liquid that has passed outside the body 41 passes between the body 20 and the venturi tube 51, flows into the nozzle tip 10, and liquid supply is started.

  The liquid that has passed through the sub-check valve body 45 is discharged from the jet nozzle 50 to the venturi tube 51 at a high speed, and generates a negative pressure in the negative pressure generation region. However, in this case, since the distal end 53 of the air pipe 52 (on the side of the nozzle cylinder tip) is communicated with the atmosphere, the automatic valve closing mechanism 30 does not receive any negative pressure and maintains the valve open state.

By the way, at the time of refueling at a large flow rate, a large amount of liquid passes through the sub-check valve body 45, and the sphere which is the sub-check valve body 4 swings in the direction orthogonal to the flow direction due to the pressure of this liquid flow and the elasticity of the spring 47. Try to move.
However, as shown in FIG. 1 and FIGS. 3A to 3C, the length around the auxiliary check valve body 45, that is, the inner wall 48, is such a length that the auxiliary check valve body 45 can be guided during operation, that is, the moving range in the flow direction. At least three (four in this embodiment) guide plates 60, 60, 60, 60 having a length L that can be covered are arranged at an equal angle on the inner periphery 48 of the flow path and swing in a direction perpendicular to the axis A. Movement is restricted as much as possible.

  At the same time, the flow passing through the sub-check valve body 45 is transformed into a spiral (tornado-shaped) flow C by twisting at an angle θ with respect to the direction of the axis A of the guide plates 60, 60, 60, 60, and the ejection nozzle 50. Flows through the Venturi tube 51 at a density as constant as possible in the cross-sectional direction (FIG. 4). As a result, the liquid flows into the negative pressure generating region at a constant flow rate, so that a stable negative pressure is generated.

  When the refueling proceeds and the liquid in the tank reaches the nozzle tip 10, the leading end 53 of the air pipe 52 is sealed by the liquid and the inflow of air is stopped, so that the negative pressure in the negative pressure generation region rapidly increases, The automatic valve closing mechanism 30 operates to close the main valve 23 to automatically stop refueling.

  On the other hand, when the opening of the main valve 23 is reduced by the operation amount of the oil supply lever 22 in order to perform additional refueling at a small flow rate, the pressure for opening the main check valve body 41 does not act, but the sub-check valve body 45 opens. Although a negative pressure is generated in the negative pressure generating region, the leading end 53 of the air pipe 52 is open to the atmosphere, so that the negative pressure does not act on the automatic valve closing mechanism 30 and the main valve 23 is maintained in the open state. Is done.

  Even in this state, the auxiliary check valve body 45 is formed by at least three guide plates 60, 60, 60, 60 which are arranged evenly in the circumferential direction around the auxiliary check valve body 45 in the same manner as when the liquid is supplied at a large flow rate. Swing in the direction perpendicular to the flow is suppressed.

At the same time, the flow passing through the valve body is converted into a spiral (tornado-shaped) flow C by the guide plate and flows through the nozzle 50 and the diffuser pipe 51 so as to flow at a uniform density in the cross-sectional direction.
When the refueling progresses and the tank becomes full and the tip 53 of the air pipe 52 is immersed in the liquid in the tank, the flow path resistance of the air pipe 52 increases, and the negative pressure in the negative pressure generation region increases. The automatic valve closing mechanism 30 is operated by the increased negative pressure, and the main valve 23 can be reliably closed.

  FIG. 5 shows a second embodiment of the present invention. In this embodiment, at least three guide members 62 are provided on the outer periphery of a sphere constituting the sub-check valve body 61 in the circumferential direction. 62, 62 are provided. These guide plates 62, 62, 62 are arranged to be twisted so as to form a fixed angle with respect to the axis. Note that reference numeral 63 in the figure denotes a protrusion that engages with the tip (small diameter side) of the spring 47.

According to this embodiment, even if the auxiliary check valve element 61 which receives the pressure of the liquid attempts to swing by receiving the force orthogonal to the flow, the movement perpendicular to the flow is restricted by the guide plates 62, 62, 62, and at the same time, the auxiliary check valve 61 The flow passing through the outer periphery of the valve body 61 flows along the guide plates 61, 61, 61. As a result, the flow is changed into a spiral shape (tornado shape) and flows through the ejection nozzle 50 and the diffuser tube 51, so that it flows as uniformly as possible in the cross-sectional direction.
Therefore, also in this embodiment, a stable negative pressure can be generated in the negative pressure generation region 55 regardless of the flow rate.

なお、表中、〇印は陰圧の発生具合が良好なことを示す。
噴出ノズル５０、ディフューザ管５１への流れを旋回させることの効果を実機の副チャッキ弁４５に相当するモデルを用いて測定したところ表１に示すような結果となった。
すなわち、液を旋回させるための案内部材は、流路内に配置する場合の捻り角度は３０゜〜９０°が、また小球に一体形成する場合の捻り角についても３０゜〜９０°が好ましい。

In the table, the symbol “〇” indicates that the degree of generation of negative pressure is good.
When the effect of swirling the flow to the jet nozzle 50 and the diffuser pipe 51 was measured using a model corresponding to the sub-check valve 45 of the actual machine, the results shown in Table 1 were obtained.
That is, the guide member for swirling the liquid preferably has a twist angle of 30 ° to 90 ° when arranged in the channel, and also preferably has a twist angle of 30 ° to 90 ° when integrally formed with the small ball. .

  In the above embodiment, the case where fuel is supplied to the fuel tank of the vehicle has been described. However, the present invention can be applied to all liquid supply devices that detect the level of the liquid and automatically stop.

  DESCRIPTION OF SYMBOLS 10 Nozzle cylinder tip part 20 Body part 21 Oil supply hose connection part 22 Oil supply lever 23 Main valve 25 Main valve spring 30 Automatic valve closing mechanism 31 Diaphragm 32 Spring 40 Check valve 41 Main check valve element 42 First spring 43 Through hole 46 Secondary check valve Body 47 Second spring 48 Inner wall 50 Spout nozzle 51 Diffuser tube 55 Negative pressure generation area 60 Guide plate 61 Secondary check valve body 62 Guide plate

Claims (5)

A main valve that is opened by a refueling lever, a check valve that is arranged downstream of the main valve and opens by the pressure of the liquid that has passed through the main valve, an air pipe having one end communicating with the nozzle cylinder tip, and An automatic closing mechanism that communicates with a negative pressure generating area provided on the downstream side of the check valve to close the main valve by receiving a predetermined negative pressure, wherein the check valve has a large-diameter main check valve body. And a small-diameter sub-check valve body located on the central axis of the main check valve body, wherein the negative pressure generation region is disposed downstream of the sub-check valve body,
The tornado-like flow to the secondary check valve body the valve seat downstream of flow path of together with spheres which constitute the valve body of the auxiliary check valve body is normally biased to a valve seat by a spring which is disposed downstream And a guide member capable of covering the moving range of the sphere is provided.   2. The automatic full tank refueling nozzle according to claim 1, wherein the guide member is disposed in a flow path near the sub-check valve body as an adapter for suppressing movement of the sphere in a radial direction. 3. The nozzle according to claim 1, wherein the guide member is provided on an outer periphery of the sphere.   The nozzle according to claim 2, wherein the guide member is twisted so as to swirl a flow passing through the sub-check valve body. 5.   The nozzle for automatic refilling according to claim 3, wherein a protrusion engaging with the spring is formed at one end of the sphere.

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