JPH0755325Y2 - 2-tank type liquid supply device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to a liquid supply apparatus having two tanks, and more particularly to a two-tank type liquid supply apparatus suitable for use in a fuel supply system of an automobile.

[Conventional technology]

BACKGROUND ART In a vehicle, when a fuel tank is provided on a vehicle body, it may be necessary to divide the fuel tank into two parts in relation to the installation space. In such a case, the fifth
As shown in the schematic side view of the figure and the schematic plan view of FIG. 6, the fuel tank is divided into a main tank 1 and a sub-tank 2, is installed in the lower part of the vehicle body, and is connected to each other by a connecting pipe 3. . In these figures, reference numeral 4 indicates a filament neck.

The fuel tank having the above-described structure is provided with a fuel supply switching valve 5 for switching fuel extraction at the bottom of the main tank 1 as shown in the schematic sectional view of FIG. A supply pipe 6 that communicates with the fuel supply pump from the switching valve 5 and a connection pipe 7 that opens at the bottom of the sub tank 2 are piped, and the main tank 1 has
A return pipe 8 that opens at the bottom and returns fuel from a carburetor or the like is provided. Further, the main tank 1 is provided with a float type gauge 9 for displaying the remaining amount of fuel.

As shown in FIG. 4, a valve seat opening 10 is opened in the upper portion of the fuel supply switching valve 5, and a float valve body that rises and falls along a cylindrical guide portion 11 provided in the upper portion of the valve seat opening 10. Twelve are provided. Further, a check valve 15 for closing the opening end 13 by being pushed up by a weak spring 14 is provided at the opening end of the connecting pipe 7 on the main tank 1 side.

In the fuel tank constructed in this way, as shown in FIG. 3, when fuel is supplied through the filler neck 4, the fuel is first filled in the sub-tank 2, and when it exceeds the level of the connecting pipe 3, the main It also flows into the tank 1, and eventually the sub tank 2 and the main tank 1 are filled as shown. Then, when the operation of the engine is started, the fuel in the fuel supply switching valve 5 is sucked through the supply pipe 6 by the operation of the fuel supply pump. At that time, since the float valve body 12 is floating. , The opening 16 of the guide portion 11 (fourth
The fuel in the main tank 1 is opened through the opening 16).
Supplied through the valve seat opening 10. When such fuel supply is continued and the fuel level in the main tank 1 drops to the position shown by the chain double-dashed line in the figure, the float valve body 12 sinks and closes the valve seat 10. Therefore, the fuel supply switching valve Negative pressure is generated in the fuel cell 5, and the fuel in the sub tank 2 is pushed through the connecting pipe 7 to open the spring 14 to be sucked into the fuel supply switching valve 5 and supplied through the supply pipe. In addition, during such a supply, the excess fuel supplied to the carburetor or the like of the engine is returned to the main tank 1 through the return pipe 8.

By the way, in such a two-tank liquid supply device, when the fuel level of the main tank 1 becomes lower than the fuel level of the sub tank 2, the fuel is transferred from the sub tank 2 to the main tank 1 via the connecting pipe 7 by the siphon principle. Pour in. A check valve is provided to prevent such a phenomenon.

[Problems to be solved by the device]

However, in the previously proposed device as described above,
When a large amount of fuel is needed during sudden acceleration of the vehicle while using the fuel in the sub-tank 2, the spring force of the spring 14 pressing the check valve 15 toward the opening end 13 causes flow resistance. Then, there is a problem that sufficient fuel cannot be sent from the fuel pump to the engine.

The present invention is intended to solve such a problem, and it is possible to prevent the liquid flow between two tanks without giving special resistance to the liquid flow. An object is to provide a liquid supply device.

[Means for Solving the Problems]

In order to achieve the above-mentioned object, a two-tank type liquid supply device of the present invention comprises a first liquid tank, a second liquid tank connected to the first liquid tank via a liquid supply communication passage, A connecting pipe having one end extending near the bottom of the second liquid tank, a base end extending near the bottom of the first liquid tank for supplying liquid from the first liquid tank to the outside, A valve chamber which is disposed at the bottom of the first liquid tank and has the other end of the connecting pipe and the base end of the liquid supply passage opened and which communicates with the first liquid tank through a valve seat opening; A first valve body provided outside the valve chamber and closing the valve seat when the liquid level in the first liquid tank is below a set level; and a liquid level inside the valve chamber provided inside the valve chamber And the valve seat opening is closed by It is characterized in that the pressure of the valve chamber in the closed state of the seat opening is provided with a liquid supply switching valve, consisting for the with the valve seat open mouth second valve body decreases.

[Action]

In the above-described two-tank liquid supply apparatus of the present invention, the first valve body closes the valve seat when the liquid level in the first liquid tank is equal to or lower than the set level, so that the liquid from the first liquid tank is closed. It acts to block the supply.

In addition, the second valve body normally closes the valve seat provided in the communication portion between the first liquid tank and the valve chamber due to the rise in the level of the liquid in the valve chamber, and then the first valve from the second liquid tank. When the liquid is discharged, it acts as a check valve that opens the valve seat opening due to the negative pressure generated in the valve chamber.

〔Example〕

Next, an embodiment of the present invention will be described. FIGS. 1 and 2 show a two-tank type liquid supply apparatus as one embodiment of the present invention. FIG. 1 is an overall sectional view thereof, and FIG. It is a fragmentary sectional view showing operation of a float valve.

As shown in FIG. 1, this two-tank type liquid supply device is
A main tank 1 as a first liquid tank, a sub tank 2 as a second liquid tank connected to the main tank 1 through a connecting pipe 7 as a communication passage, and a liquid from the main tank 1 to a fuel pump as a liquid. A supply pipe 6 serving as a liquid supply passage for sending out fuel, and a fuel supply switching valve 5 serving as a liquid supply switching valve for switching delivery of fuel from the main tank 1 and the sub tank 2 to the supply pipe 6.
It has

As shown in FIG. 2, the fuel supply switching valve 5 is connected to the fuel supply switching valve 5 from the main tank 1 through the opening 16 of the guide portion 11.
A valve seat opening 10 communicating with the valve chamber 17 is provided, and a valve seat seal 19 is attached to the valve seat opening 10. No. 1 is above the valve seat 10.
A float valve body 12 as a valve body is provided, and a valve chamber 17
A floater valve body 18 serving as a second valve body that closes the valve seat opening 10 from below due to an increase in the fuel level therein is provided so as to be floatable / sinkable.

In FIGS. 1 and 2, the same parts as those of the previously proposed device are designated by the same reference numerals, and the detailed description thereof will be omitted.

In the two-tank type liquid supply apparatus of the present embodiment configured as described above, as shown in FIG. 2 (A), the float valve body 18 is moved by the increase in the fuel level in the valve chamber 17 of the fuel supply switching valve 5. The floating valve is closed and the flow from the connecting pipe 7 in the sub tank 2 to the opening 16 is blocked.

When the fuel supply is started, a negative pressure is generated in the valve chamber 17 as in the case of the previously proposed device, and this negative pressure causes the float to float as shown in FIG. 2 (B). The valve body 18 separates from the valve seat opening 10, and the fuel flows from the main tank 1 through the opening 16 of the guide portion 11, the valve seat opening 10 and the valve chamber 17 as shown by the arrow, and is delivered to the fuel pump.

In this operation, as in this embodiment, the float valve body 18 is configured as a float having a slight buoyancy so that the valve seat opening 10 is opened by a slight negative pressure in the valve chamber 17. Therefore, it is preferable.

As shown in FIG. 2 (C), when the fuel level in the main tank 1 is lowered and the float valve body 12 is seated on the valve seat seal 19, the flow of fuel from the opening 16 to the supply pipe 6 is blocked. Therefore, this time, a flow from the connecting pipe 7 to the supply pipe 6 via the valve chamber 17 is generated, and the fuel in the sub tank 2 is sent out instead of the fuel in the main tank 1.

In this way, according to the above-mentioned two-tank type liquid supply device, when a large amount of fuel is needed while the sub-tank 2 is being used, the opening in the valve chamber 17 of the connecting pipe 7 is
There is no flow resistance, such as a check valve, so that there is no flow resistance and therefore sufficient fuel is pumped into the engine from the fuel pump.

The present invention has been described in detail above based on an embodiment, but the present invention is not limited to the above-mentioned embodiment, and may be appropriately modified within the scope of matters described in the scope of claims for utility model registration. The invention is not limited to the fuel supply.

[Effect of device]

As described in detail above, according to the two-tank type liquid supply device of the present invention, normally, the liquid level in the valve chamber rises,
The valve seat opening provided in the communication portion between the liquid tank and the valve chamber shown in FIG. 1 is closed to prevent the flow from the second liquid tank to the first liquid tank, while it is generated in the valve chamber when the liquid is discharged. A second valve body having a function as a check valve that opens the valve seat opening by the negative pressure is provided inside the valve chamber, and the check valve is provided at the opening in the valve chamber of the connecting pipe. Since there is no member having such a flow resistance as described above, there is no change in the flow resistance of the liquid even after switching from the first liquid tank to the second liquid tank, and the flow resistance to the liquid supply passage is not changed. The liquid can be delivered smoothly, and fluctuations in the liquid level in the two tanks can be minimized.

[Brief description of drawings]

FIGS. 1 and 2 show a two-tank type liquid supply apparatus as an embodiment of the present invention. FIG. 1 is an overall sectional view thereof, and FIG. 2 is a II of FIG. 1 showing the operation of the float valve. FIG. 3 is an enlarged cross-sectional view of a part, and FIGS. 3 to 6 show the previously proposed two-tank type liquid supply device, FIG. 3 is a schematic cross-sectional view thereof, and FIG. 4 is an enlarged part IV of FIG. A sectional view, FIG. 5 is a schematic side view thereof,
FIG. 6 is a schematic plan view thereof. 1 ... Main tank as first liquid tank, 2 ...
Sub tank as second liquid tank, 3 ... Connection pipe, 4 ... Filler neck, 5 ... Fuel supply switching valve as liquid supply switching valve, 6 ... Supply pipe as liquid supply passage, 7 ... Connection Pipe, 8 ... Return pipe, 9 ... Gauge, 10 ... Valve seat, 11 ... Guide, 12 ... Float valve body,
13 …… Opening end, 14 …… Spring, 15 …… Check valve, 16…
… Opening, 17 …… Valve chamber, 18 …… Float valve body, 19 …… Valve seat seal, 20 …… Guide section.

Claims (1)

[Scope of utility model registration request] 1. A first liquid tank, a second liquid tank connected to the first liquid tank via a liquid replenishing communication passage, and a connection having one end extending near the bottom of the second liquid tank. A pipe, a liquid supply passage whose base end extends in the vicinity of the bottom of the first liquid tank to supply liquid from the first liquid tank to the outside, and a pipe which is arranged at the bottom of the first liquid tank and has the connection A valve chamber in which the other end of the pipe and the base end of the liquid supply passage are opened and communicates with the first liquid tank via a valve seat opening, and inside the first liquid tank provided outside the valve chamber A first valve element that closes the valve seat opening when the liquid level of the valve is below a set level, and the valve seat opening is closed and the valve seat opening is provided by increasing the liquid level inside the valve chamber. With the valve closed, the pressure in the valve chamber will drop. A liquid supply switching valve consisting of the valve seat open mouth second valve body, characterized by comprising a second tank liquid feeding means.