JPH0452478Y2 - - Google Patents

Description

[Detailed Description of the Invention] <Industrial Application Field> The present invention relates to an in-tank turbine type fuel pump.

<Prior Art> Recently, turbine-type fuel pumps (non-displacement type circumferential flow There is a tendency for pumps to be used (see Utility Model Application No. 60-38952).

An example of this turbine type fuel pump is shown in FIGS. 3 and 4.

The turbine-type fuel pump 6 has an impeller 9 that rotates around a shaft 8 within a pump housing 7 to suck in fuel from a suction port 10, pass through a flow path 11, and discharge it from a discharge port 12. Since this turbine-type fuel pump 6 is operated at high rotation speeds and vapor is likely to be generated, a vapor removal passage 13 is provided in the middle of the flow path 11 in order to improve heat-resistant flow characteristics.
Fuel containing vapor is discharged from the tank.

In FIGS. 3 and 4, 14 is a filter connected to the suction port 10, and 15 is a pipe for discharging fuel to the outside of the fuel tank 1.

Furthermore, as seen in Japanese Utility Model Application Publication No. 59-110373, there are some in which an electric fuel pump such as a turbine type fuel pump is disposed within the fuel tank.

In this type of in-tank turbine fuel pump, as shown in Fig. 5, the fuel tank 1 is
An annular partition wall 2 is erected on the bottom wall 1a of the fuel tank, an outer portion 3 and an inner portion 4 separated by the partition wall 2 are communicated via an orifice 5, and a fuel pump 6 is disposed in the inner portion 4. As a result, the fuel in the inner part 4 is sucked in, and the fuel containing vapor discharged from the vapor removal passage 13 is discharged into the inner part 4 (see Utility Model Application No. 172,316/1988).

<Problems to be solved by the invention> However, in such a conventional in-tank turbine fuel pump, the fuel discharged from the vapor removal passage 13 of the turbine fuel pump 6 is discharged from the bottom of the fuel tank 1. Since the fuel was discharged at a substantially right angle toward the wall 1a, the fuel discharged from the vapor removal passage 13 collided with the bottom wall 1a, causing a collision sound and a chattering sound (resonance sound) of the bottom wall 1a. However, this caused an increase in the noise of the in-tank turbine type fuel pump 6.

The present invention was devised in view of the above problems, and an object of the present invention is to reduce noise caused by fuel discharged from a vapor removal passage in an in-tank turbine fuel pump.

<Means for Solving the Problems> Therefore, in the present invention, the vapor removal passage of the turbine-type fuel pump is opened obliquely with respect to the partition wall provided upright on the bottom wall of the fuel tank.

<Function> According to such an in-tank turbine fuel pump, the fuel discharged from the vapor removal passage is discharged obliquely to the wall surface, so that the impact force is reduced compared to when the fuel collides at a substantially right angle.

Furthermore, since the part where the fuel discharged from the vapor removal passage collides is inside the fuel tank, the noise is alleviated within the fuel tank, and leakage of noise to the outside becomes small.

<Example> An example of the present invention will be described below based on the drawings. Note that the same elements as in the conventional example are given the same reference numerals.

As shown in FIGS. 1 and 2, the turbine-type fuel pump 6 is built into the fuel tank 1, and a suction port 10 and a vapor removal passage 13 provided in the main body are vertically connected to the bottom wall 1a of the fuel tank 1. It is installed in an inner part 4 surrounded by an annular partition wall 2 provided therein.

Here, one end of a pipe 20 is connected to the vapor removal passage 13, and an opening 20a on the other end side of the pipe 20 is approximately horizontal and extends from the inner part 4 of the partition wall 2 to the partition wall 2. Opens diagonally. That is, the vapor removal passage 13 and the pipe 20 constitute a vapor removal passage. Therefore, the fuel discharged from the vapor removal passage 13 is guided by the pipe 20 and discharged substantially horizontally and obliquely to the partition wall 2, and collides with the partition wall 2.

According to this configuration, the impact force against the wall surface is reduced compared to the case where the ball is emitted perpendicularly to the wall surface and collides with the wall surface. Therefore, noise is reduced compared to when the fuel discharged from the vapor removal passage 13 is discharged so as to collide with the bottom wall 1a of the fuel tank 1 at a substantially right angle.

Furthermore, since the light is directed toward the partition wall 2 instead of the bottom wall 1a of the fuel tank 1, further noise reduction can be achieved. That is, since the collision portion of the fuel discharged from the vapor removal passage 13 via the pipe 20 is within the fuel tank 1, the generated noise is alleviated within the fuel tank 1, and only a small amount of noise leaks to the outside. Become.

Furthermore, as in this embodiment, the vapor removal passage 13
When the fuel discharged from the pipe 20 is guided through the pipe 20 and discharged substantially horizontally and obliquely to the partition wall 2, a swirling flow is generated in the inner part 4 of the partition wall 2. The liquid level is higher near the partition wall 2 than in the outer portion 3. Therefore, if the suction port 10 for sucking fuel is provided in the vicinity of the partition wall 2 of the inner portion 4, there is an effect that the suction performance of the turbine-type fuel pump 6 can be improved when the liquid level is low.

<Effects of the invention> As explained above, according to the invention, the vapor removal passage of the turbine-type fuel pump is opened diagonally to the partition wall installed on the bottom wall of the fuel tank. This has the effect of reducing noise in a turbine type fuel pump.

[Brief explanation of the drawing]

Fig. 1 is a sectional view of a fuel tank showing an embodiment of the present invention, Fig. 2 is a plan view of essential parts showing the same embodiment, and Fig. 3 is a sectional view showing an example of a turbine-type fuel pump (Fig. 4). - cross-sectional view), Figure 4 is the same as Figure 3 -
Cross-sectional view: FIG. 5 is a cross-sectional view of a fuel tank showing a conventional example. DESCRIPTION OF SYMBOLS 1... Fuel tank, 1a... Bottom wall, 2... Partition wall, 3... Outer part, 4... Inner part, 6... Turbine type fuel pump, 10... Suction port, 13...
Vapor removal passage, 20...pipe, 20a...
Aperture.

Claims (1)

[Scope of utility model registration request] In an in-tank turbine type fuel pump built in a fuel tank having a partition wall erected on the bottom wall and having a vapor removal passage in the middle of the flow path, the vapor removal passage is opened diagonally with respect to the partition wall. This is an in-tank turbine type fuel pump.